1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
9 #include "sd-messages.h"
11 #include "all-units.h"
12 #include "alloc-util.h"
13 #include "bpf-firewall.h"
14 #include "bpf-foreign.h"
15 #include "bpf-socket-bind.h"
16 #include "bus-common-errors.h"
18 #include "cgroup-setup.h"
19 #include "cgroup-util.h"
20 #include "chase-symlinks.h"
21 #include "core-varlink.h"
22 #include "dbus-unit.h"
28 #include "fileio-label.h"
30 #include "format-util.h"
31 #include "id128-util.h"
35 #include "load-dropin.h"
36 #include "load-fragment.h"
39 #include "missing_audit.h"
40 #include "mkdir-label.h"
41 #include "path-util.h"
42 #include "process-util.h"
44 #include "serialize.h"
46 #include "signal-util.h"
47 #include "sparse-endian.h"
49 #include "specifier.h"
50 #include "stat-util.h"
51 #include "stdio-util.h"
52 #include "string-table.h"
53 #include "string-util.h"
55 #include "terminal-util.h"
56 #include "tmpfile-util.h"
57 #include "umask-util.h"
58 #include "unit-name.h"
60 #include "user-util.h"
66 /* Thresholds for logging at INFO level about resource consumption */
67 #define MENTIONWORTHY_CPU_NSEC (1 * NSEC_PER_SEC)
68 #define MENTIONWORTHY_IO_BYTES (1024 * 1024ULL)
69 #define MENTIONWORTHY_IP_BYTES (0ULL)
71 /* Thresholds for logging at INFO level about resource consumption */
72 #define NOTICEWORTHY_CPU_NSEC (10*60 * NSEC_PER_SEC) /* 10 minutes */
73 #define NOTICEWORTHY_IO_BYTES (10 * 1024 * 1024ULL) /* 10 MB */
74 #define NOTICEWORTHY_IP_BYTES (128 * 1024 * 1024ULL) /* 128 MB */
76 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
77 [UNIT_SERVICE
] = &service_vtable
,
78 [UNIT_SOCKET
] = &socket_vtable
,
79 [UNIT_TARGET
] = &target_vtable
,
80 [UNIT_DEVICE
] = &device_vtable
,
81 [UNIT_MOUNT
] = &mount_vtable
,
82 [UNIT_AUTOMOUNT
] = &automount_vtable
,
83 [UNIT_SWAP
] = &swap_vtable
,
84 [UNIT_TIMER
] = &timer_vtable
,
85 [UNIT_PATH
] = &path_vtable
,
86 [UNIT_SLICE
] = &slice_vtable
,
87 [UNIT_SCOPE
] = &scope_vtable
,
90 Unit
* unit_new(Manager
*m
, size_t size
) {
94 assert(size
>= sizeof(Unit
));
101 u
->type
= _UNIT_TYPE_INVALID
;
102 u
->default_dependencies
= true;
103 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
104 u
->unit_file_preset
= -1;
105 u
->on_failure_job_mode
= JOB_REPLACE
;
106 u
->on_success_job_mode
= JOB_FAIL
;
107 u
->cgroup_control_inotify_wd
= -1;
108 u
->cgroup_memory_inotify_wd
= -1;
109 u
->job_timeout
= USEC_INFINITY
;
110 u
->job_running_timeout
= USEC_INFINITY
;
111 u
->ref_uid
= UID_INVALID
;
112 u
->ref_gid
= GID_INVALID
;
113 u
->cpu_usage_last
= NSEC_INFINITY
;
114 u
->cgroup_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
115 u
->failure_action_exit_status
= u
->success_action_exit_status
= -1;
117 u
->ip_accounting_ingress_map_fd
= -1;
118 u
->ip_accounting_egress_map_fd
= -1;
119 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++)
120 u
->io_accounting_last
[i
] = UINT64_MAX
;
122 u
->ipv4_allow_map_fd
= -1;
123 u
->ipv6_allow_map_fd
= -1;
124 u
->ipv4_deny_map_fd
= -1;
125 u
->ipv6_deny_map_fd
= -1;
127 u
->last_section_private
= -1;
129 u
->start_ratelimit
= (RateLimit
) { m
->default_start_limit_interval
, m
->default_start_limit_burst
};
130 u
->auto_start_stop_ratelimit
= (RateLimit
) { 10 * USEC_PER_SEC
, 16 };
135 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
136 _cleanup_(unit_freep
) Unit
*u
= NULL
;
139 u
= unit_new(m
, size
);
143 r
= unit_add_name(u
, name
);
152 bool unit_has_name(const Unit
*u
, const char *name
) {
156 return streq_ptr(name
, u
->id
) ||
157 set_contains(u
->aliases
, name
);
160 static void unit_init(Unit
*u
) {
167 assert(u
->type
>= 0);
169 cc
= unit_get_cgroup_context(u
);
171 cgroup_context_init(cc
);
173 /* Copy in the manager defaults into the cgroup
174 * context, _before_ the rest of the settings have
175 * been initialized */
177 cc
->cpu_accounting
= u
->manager
->default_cpu_accounting
;
178 cc
->io_accounting
= u
->manager
->default_io_accounting
;
179 cc
->blockio_accounting
= u
->manager
->default_blockio_accounting
;
180 cc
->memory_accounting
= u
->manager
->default_memory_accounting
;
181 cc
->tasks_accounting
= u
->manager
->default_tasks_accounting
;
182 cc
->ip_accounting
= u
->manager
->default_ip_accounting
;
184 if (u
->type
!= UNIT_SLICE
)
185 cc
->tasks_max
= u
->manager
->default_tasks_max
;
188 ec
= unit_get_exec_context(u
);
190 exec_context_init(ec
);
192 if (u
->manager
->default_oom_score_adjust_set
) {
193 ec
->oom_score_adjust
= u
->manager
->default_oom_score_adjust
;
194 ec
->oom_score_adjust_set
= true;
197 if (MANAGER_IS_SYSTEM(u
->manager
))
198 ec
->keyring_mode
= EXEC_KEYRING_SHARED
;
200 ec
->keyring_mode
= EXEC_KEYRING_INHERIT
;
202 /* User manager might have its umask redefined by PAM or UMask=. In this
203 * case let the units it manages inherit this value by default. They can
204 * still tune this value through their own unit file */
205 (void) get_process_umask(getpid_cached(), &ec
->umask
);
209 kc
= unit_get_kill_context(u
);
211 kill_context_init(kc
);
213 if (UNIT_VTABLE(u
)->init
)
214 UNIT_VTABLE(u
)->init(u
);
217 static int unit_add_alias(Unit
*u
, char *donated_name
) {
220 /* Make sure that u->names is allocated. We may leave u->names
221 * empty if we fail later, but this is not a problem. */
222 r
= set_ensure_put(&u
->aliases
, &string_hash_ops
, donated_name
);
230 int unit_add_name(Unit
*u
, const char *text
) {
231 _cleanup_free_
char *name
= NULL
, *instance
= NULL
;
238 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
240 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
241 "instance is not set when adding name '%s': %m", text
);
243 r
= unit_name_replace_instance(text
, u
->instance
, &name
);
245 return log_unit_debug_errno(u
, r
,
246 "failed to build instance name from '%s': %m", text
);
253 if (unit_has_name(u
, name
))
256 if (hashmap_contains(u
->manager
->units
, name
))
257 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
258 "unit already exist when adding name '%s': %m", name
);
260 if (!unit_name_is_valid(name
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
261 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
262 "name '%s' is invalid: %m", name
);
264 t
= unit_name_to_type(name
);
266 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
267 "failed to derive unit type from name '%s': %m", name
);
269 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
270 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
271 "unit type is illegal: u->type(%d) and t(%d) for name '%s': %m",
274 r
= unit_name_to_instance(name
, &instance
);
276 return log_unit_debug_errno(u
, r
, "failed to extract instance from name '%s': %m", name
);
278 if (instance
&& !unit_type_may_template(t
))
279 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
), "templates are not allowed for name '%s': %m", name
);
281 /* Ensure that this unit either has no instance, or that the instance matches. */
282 if (u
->type
!= _UNIT_TYPE_INVALID
&& !streq_ptr(u
->instance
, instance
))
283 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
284 "cannot add name %s, the instances don't match (\"%s\" != \"%s\").",
285 name
, instance
, u
->instance
);
287 if (u
->id
&& !unit_type_may_alias(t
))
288 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
289 "cannot add name %s, aliases are not allowed for %s units.",
290 name
, unit_type_to_string(t
));
292 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
293 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(E2BIG
), "cannot add name, manager has too many units: %m");
295 /* Add name to the global hashmap first, because that's easier to undo */
296 r
= hashmap_put(u
->manager
->units
, name
, u
);
298 return log_unit_debug_errno(u
, r
, "add unit to hashmap failed for name '%s': %m", text
);
301 r
= unit_add_alias(u
, name
); /* unit_add_alias() takes ownership of the name on success */
303 hashmap_remove(u
->manager
->units
, name
);
309 /* A new name, we don't need the set yet. */
310 assert(u
->type
== _UNIT_TYPE_INVALID
);
311 assert(!u
->instance
);
314 u
->id
= TAKE_PTR(name
);
315 u
->instance
= TAKE_PTR(instance
);
317 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
321 unit_add_to_dbus_queue(u
);
325 int unit_choose_id(Unit
*u
, const char *name
) {
326 _cleanup_free_
char *t
= NULL
;
333 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
337 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
344 if (streq_ptr(u
->id
, name
))
345 return 0; /* Nothing to do. */
347 /* Selects one of the aliases of this unit as the id */
348 s
= set_get(u
->aliases
, (char*) name
);
353 r
= set_remove_and_put(u
->aliases
, name
, u
->id
);
357 assert_se(set_remove(u
->aliases
, name
)); /* see set_get() above… */
359 u
->id
= s
; /* Old u->id is now stored in the set, and s is not stored anywhere */
360 unit_add_to_dbus_queue(u
);
365 int unit_set_description(Unit
*u
, const char *description
) {
370 r
= free_and_strdup(&u
->description
, empty_to_null(description
));
374 unit_add_to_dbus_queue(u
);
379 static bool unit_success_failure_handler_has_jobs(Unit
*unit
) {
382 UNIT_FOREACH_DEPENDENCY(other
, unit
, UNIT_ATOM_ON_SUCCESS
)
383 if (other
->job
|| other
->nop_job
)
386 UNIT_FOREACH_DEPENDENCY(other
, unit
, UNIT_ATOM_ON_FAILURE
)
387 if (other
->job
|| other
->nop_job
)
393 bool unit_may_gc(Unit
*u
) {
394 UnitActiveState state
;
399 /* Checks whether the unit is ready to be unloaded for garbage collection.
400 * Returns true when the unit may be collected, and false if there's some
401 * reason to keep it loaded.
403 * References from other units are *not* checked here. Instead, this is done
404 * in unit_gc_sweep(), but using markers to properly collect dependency loops.
407 if (u
->job
|| u
->nop_job
)
410 state
= unit_active_state(u
);
412 /* If the unit is inactive and failed and no job is queued for it, then release its runtime resources */
413 if (UNIT_IS_INACTIVE_OR_FAILED(state
) &&
414 UNIT_VTABLE(u
)->release_resources
)
415 UNIT_VTABLE(u
)->release_resources(u
);
420 if (sd_bus_track_count(u
->bus_track
) > 0)
423 /* But we keep the unit object around for longer when it is referenced or configured to not be gc'ed */
424 switch (u
->collect_mode
) {
426 case COLLECT_INACTIVE
:
427 if (state
!= UNIT_INACTIVE
)
432 case COLLECT_INACTIVE_OR_FAILED
:
433 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
439 assert_not_reached();
442 /* Check if any OnFailure= or on Success= jobs may be pending */
443 if (unit_success_failure_handler_has_jobs(u
))
446 if (u
->cgroup_path
) {
447 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
448 * around. Units with active processes should never be collected. */
450 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
452 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", empty_to_root(u
->cgroup_path
));
457 if (UNIT_VTABLE(u
)->may_gc
&& !UNIT_VTABLE(u
)->may_gc(u
))
463 void unit_add_to_load_queue(Unit
*u
) {
465 assert(u
->type
!= _UNIT_TYPE_INVALID
);
467 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
470 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
471 u
->in_load_queue
= true;
474 void unit_add_to_cleanup_queue(Unit
*u
) {
477 if (u
->in_cleanup_queue
)
480 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
481 u
->in_cleanup_queue
= true;
484 void unit_add_to_gc_queue(Unit
*u
) {
487 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
493 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
494 u
->in_gc_queue
= true;
497 void unit_add_to_dbus_queue(Unit
*u
) {
499 assert(u
->type
!= _UNIT_TYPE_INVALID
);
501 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
504 /* Shortcut things if nobody cares */
505 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
506 sd_bus_track_count(u
->bus_track
) <= 0 &&
507 set_isempty(u
->manager
->private_buses
)) {
508 u
->sent_dbus_new_signal
= true;
512 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
513 u
->in_dbus_queue
= true;
516 void unit_submit_to_stop_when_unneeded_queue(Unit
*u
) {
519 if (u
->in_stop_when_unneeded_queue
)
522 if (!u
->stop_when_unneeded
)
525 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
528 LIST_PREPEND(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
529 u
->in_stop_when_unneeded_queue
= true;
532 void unit_submit_to_start_when_upheld_queue(Unit
*u
) {
535 if (u
->in_start_when_upheld_queue
)
538 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)))
541 if (!unit_has_dependency(u
, UNIT_ATOM_START_STEADILY
, NULL
))
544 LIST_PREPEND(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
545 u
->in_start_when_upheld_queue
= true;
548 void unit_submit_to_stop_when_bound_queue(Unit
*u
) {
551 if (u
->in_stop_when_bound_queue
)
554 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
557 if (!unit_has_dependency(u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
, NULL
))
560 LIST_PREPEND(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
561 u
->in_stop_when_bound_queue
= true;
564 static void unit_clear_dependencies(Unit
*u
) {
567 /* Removes all dependencies configured on u and their reverse dependencies. */
569 for (Hashmap
*deps
; (deps
= hashmap_steal_first(u
->dependencies
));) {
571 for (Unit
*other
; (other
= hashmap_steal_first_key(deps
));) {
574 HASHMAP_FOREACH(other_deps
, other
->dependencies
)
575 hashmap_remove(other_deps
, u
);
577 unit_add_to_gc_queue(other
);
583 u
->dependencies
= hashmap_free(u
->dependencies
);
586 static void unit_remove_transient(Unit
*u
) {
592 if (u
->fragment_path
)
593 (void) unlink(u
->fragment_path
);
595 STRV_FOREACH(i
, u
->dropin_paths
) {
596 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
598 if (path_extract_directory(*i
, &p
) < 0) /* Get the drop-in directory from the drop-in file */
601 if (path_extract_directory(p
, &pp
) < 0) /* Get the config directory from the drop-in directory */
604 /* Only drop transient drop-ins */
605 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
613 static void unit_free_requires_mounts_for(Unit
*u
) {
617 _cleanup_free_
char *path
= NULL
;
619 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
623 char s
[strlen(path
) + 1];
625 PATH_FOREACH_PREFIX_MORE(s
, path
) {
629 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
633 (void) set_remove(x
, u
);
635 if (set_isempty(x
)) {
636 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
644 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
647 static void unit_done(Unit
*u
) {
656 if (UNIT_VTABLE(u
)->done
)
657 UNIT_VTABLE(u
)->done(u
);
659 ec
= unit_get_exec_context(u
);
661 exec_context_done(ec
);
663 cc
= unit_get_cgroup_context(u
);
665 cgroup_context_done(cc
);
668 Unit
* unit_free(Unit
*u
) {
675 u
->transient_file
= safe_fclose(u
->transient_file
);
677 if (!MANAGER_IS_RELOADING(u
->manager
))
678 unit_remove_transient(u
);
680 bus_unit_send_removed_signal(u
);
684 unit_dequeue_rewatch_pids(u
);
686 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
687 u
->bus_track
= sd_bus_track_unref(u
->bus_track
);
688 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
689 u
->pending_freezer_message
= sd_bus_message_unref(u
->pending_freezer_message
);
691 unit_free_requires_mounts_for(u
);
693 SET_FOREACH(t
, u
->aliases
)
694 hashmap_remove_value(u
->manager
->units
, t
, u
);
696 hashmap_remove_value(u
->manager
->units
, u
->id
, u
);
698 if (!sd_id128_is_null(u
->invocation_id
))
699 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
713 /* A unit is being dropped from the tree, make sure our family is realized properly. Do this after we
714 * detach the unit from slice tree in order to eliminate its effect on controller masks. */
715 slice
= UNIT_GET_SLICE(u
);
716 unit_clear_dependencies(u
);
718 unit_add_family_to_cgroup_realize_queue(slice
);
721 manager_unref_console(u
->manager
);
724 fdset_free(u
->initial_socket_bind_link_fds
);
726 bpf_link_free(u
->ipv4_socket_bind_link
);
727 bpf_link_free(u
->ipv6_socket_bind_link
);
730 unit_release_cgroup(u
);
732 if (!MANAGER_IS_RELOADING(u
->manager
))
733 unit_unlink_state_files(u
);
735 unit_unref_uid_gid(u
, false);
737 (void) manager_update_failed_units(u
->manager
, u
, false);
738 set_remove(u
->manager
->startup_units
, u
);
740 unit_unwatch_all_pids(u
);
742 while (u
->refs_by_target
)
743 unit_ref_unset(u
->refs_by_target
);
745 if (u
->type
!= _UNIT_TYPE_INVALID
)
746 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
748 if (u
->in_load_queue
)
749 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
751 if (u
->in_dbus_queue
)
752 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
754 if (u
->in_cleanup_queue
)
755 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
758 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
760 if (u
->in_cgroup_realize_queue
)
761 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
763 if (u
->in_cgroup_empty_queue
)
764 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
766 if (u
->in_cgroup_oom_queue
)
767 LIST_REMOVE(cgroup_oom_queue
, u
->manager
->cgroup_oom_queue
, u
);
769 if (u
->in_target_deps_queue
)
770 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
772 if (u
->in_stop_when_unneeded_queue
)
773 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
775 if (u
->in_start_when_upheld_queue
)
776 LIST_REMOVE(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
778 if (u
->in_stop_when_bound_queue
)
779 LIST_REMOVE(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
781 bpf_firewall_close(u
);
783 hashmap_free(u
->bpf_foreign_by_key
);
785 bpf_program_free(u
->bpf_device_control_installed
);
788 bpf_link_free(u
->restrict_ifaces_ingress_bpf_link
);
789 bpf_link_free(u
->restrict_ifaces_egress_bpf_link
);
791 fdset_free(u
->initial_restric_ifaces_link_fds
);
793 condition_free_list(u
->conditions
);
794 condition_free_list(u
->asserts
);
796 free(u
->description
);
797 strv_free(u
->documentation
);
798 free(u
->fragment_path
);
799 free(u
->source_path
);
800 strv_free(u
->dropin_paths
);
803 free(u
->job_timeout_reboot_arg
);
806 free(u
->access_selinux_context
);
808 set_free_free(u
->aliases
);
811 activation_details_unref(u
->activation_details
);
816 FreezerState
unit_freezer_state(Unit
*u
) {
819 return u
->freezer_state
;
822 int unit_freezer_state_kernel(Unit
*u
, FreezerState
*ret
) {
823 char *values
[1] = {};
828 r
= cg_get_keyed_attribute(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events",
829 STRV_MAKE("frozen"), values
);
833 r
= _FREEZER_STATE_INVALID
;
836 if (streq(values
[0], "0"))
838 else if (streq(values
[0], "1"))
848 UnitActiveState
unit_active_state(Unit
*u
) {
851 if (u
->load_state
== UNIT_MERGED
)
852 return unit_active_state(unit_follow_merge(u
));
854 /* After a reload it might happen that a unit is not correctly
855 * loaded but still has a process around. That's why we won't
856 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
858 return UNIT_VTABLE(u
)->active_state(u
);
861 const char* unit_sub_state_to_string(Unit
*u
) {
864 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
867 static int unit_merge_names(Unit
*u
, Unit
*other
) {
874 r
= unit_add_alias(u
, other
->id
);
878 r
= set_move(u
->aliases
, other
->aliases
);
880 set_remove(u
->aliases
, other
->id
);
885 other
->aliases
= set_free_free(other
->aliases
);
887 SET_FOREACH(name
, u
->aliases
)
888 assert_se(hashmap_replace(u
->manager
->units
, name
, u
) == 0);
893 static int unit_reserve_dependencies(Unit
*u
, Unit
*other
) {
902 /* Let's reserve some space in the dependency hashmaps so that later on merging the units cannot
905 * First make some room in the per dependency type hashmaps. Using the summed size of both unit's
906 * hashmaps is an estimate that is likely too high since they probably use some of the same
907 * types. But it's never too low, and that's all we need. */
909 n_reserve
= MIN(hashmap_size(other
->dependencies
), LESS_BY((size_t) _UNIT_DEPENDENCY_MAX
, hashmap_size(u
->dependencies
)));
911 r
= hashmap_ensure_allocated(&u
->dependencies
, NULL
);
915 r
= hashmap_reserve(u
->dependencies
, n_reserve
);
920 /* Now, enlarge our per dependency type hashmaps by the number of entries in the same hashmap of the
921 * other unit's dependencies.
923 * NB: If u does not have a dependency set allocated for some dependency type, there is no need to
924 * reserve anything for. In that case other's set will be transferred as a whole to u by
925 * complete_move(). */
927 HASHMAP_FOREACH_KEY(deps
, d
, u
->dependencies
) {
930 other_deps
= hashmap_get(other
->dependencies
, d
);
932 r
= hashmap_reserve(deps
, hashmap_size(other_deps
));
940 static void unit_maybe_warn_about_dependency(
942 const char *other_id
,
943 UnitDependency dependency
) {
947 /* Only warn about some unit types */
948 if (!IN_SET(dependency
,
959 if (streq_ptr(u
->id
, other_id
))
960 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
962 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other_id
), u
->id
);
965 static int unit_per_dependency_type_hashmap_update(
968 UnitDependencyMask origin_mask
,
969 UnitDependencyMask destination_mask
) {
971 UnitDependencyInfo info
;
975 assert_cc(sizeof(void*) == sizeof(info
));
977 /* Acquire the UnitDependencyInfo entry for the Unit* we are interested in, and update it if it
978 * exists, or insert it anew if not. */
980 info
.data
= hashmap_get(per_type
, other
);
982 /* Entry already exists. Add in our mask. */
984 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
985 FLAGS_SET(destination_mask
, info
.destination_mask
))
988 info
.origin_mask
|= origin_mask
;
989 info
.destination_mask
|= destination_mask
;
991 r
= hashmap_update(per_type
, other
, info
.data
);
993 info
= (UnitDependencyInfo
) {
994 .origin_mask
= origin_mask
,
995 .destination_mask
= destination_mask
,
998 r
= hashmap_put(per_type
, other
, info
.data
);
1007 static int unit_add_dependency_hashmap(
1008 Hashmap
**dependencies
,
1011 UnitDependencyMask origin_mask
,
1012 UnitDependencyMask destination_mask
) {
1017 assert(dependencies
);
1019 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
1020 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
1021 assert(origin_mask
> 0 || destination_mask
> 0);
1023 /* Ensure the top-level dependency hashmap exists that maps UnitDependency → Hashmap(Unit* →
1024 * UnitDependencyInfo) */
1025 r
= hashmap_ensure_allocated(dependencies
, NULL
);
1029 /* Acquire the inner hashmap, that maps Unit* → UnitDependencyInfo, for the specified dependency
1030 * type, and if it's missing allocate it and insert it. */
1031 per_type
= hashmap_get(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
));
1033 per_type
= hashmap_new(NULL
);
1037 r
= hashmap_put(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
), per_type
);
1039 hashmap_free(per_type
);
1044 return unit_per_dependency_type_hashmap_update(per_type
, other
, origin_mask
, destination_mask
);
1047 static void unit_merge_dependencies(
1060 _cleanup_(hashmap_freep
) Hashmap
*other_deps
= NULL
;
1061 UnitDependencyInfo di_back
;
1063 void *dt
; /* Actually of type UnitDependency, except that we don't bother casting it here,
1064 * since the hashmaps all want it as void pointer. */
1066 /* Let's focus on one dependency type at a time, that 'other' has defined. */
1067 other_deps
= hashmap_steal_first_key_and_value(other
->dependencies
, &dt
);
1071 /* Now iterate through all dependencies of this dependency type, of 'other'. We refer to the
1072 * referenced units as 'back'. */
1073 HASHMAP_FOREACH_KEY(di_back
.data
, back
, other_deps
) {
1078 /* This is a dependency pointing back to the unit we want to merge with?
1079 * Suppress it (but warn) */
1080 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1084 /* Now iterate through all deps of 'back', and fix the ones pointing to 'other' to
1085 * point to 'u' instead. */
1086 HASHMAP_FOREACH_KEY(back_deps
, back_dt
, back
->dependencies
) {
1087 UnitDependencyInfo di_move
;
1089 di_move
.data
= hashmap_remove(back_deps
, other
);
1093 assert_se(unit_per_dependency_type_hashmap_update(
1096 di_move
.origin_mask
,
1097 di_move
.destination_mask
) >= 0);
1101 /* Now all references towards 'other' of the current type 'dt' are corrected to point to
1102 * 'u'. Lets's now move the deps of type 'dt' from 'other' to 'u'. First, let's try to move
1103 * them per type wholesale. */
1104 r
= hashmap_put(u
->dependencies
, dt
, other_deps
);
1108 /* The target unit already has dependencies of this type, let's then merge this individually. */
1110 assert_se(deps
= hashmap_get(u
->dependencies
, dt
));
1113 UnitDependencyInfo di_move
;
1116 di_move
.data
= hashmap_steal_first_key_and_value(other_deps
, (void**) &back
);
1120 /* Would point back to us, ignore */
1121 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1125 assert_se(unit_per_dependency_type_hashmap_update(deps
, back
, di_move
.origin_mask
, di_move
.destination_mask
) >= 0);
1129 TAKE_PTR(other_deps
);
1131 if (hashmap_remove(other_deps
, u
))
1132 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1136 other
->dependencies
= hashmap_free(other
->dependencies
);
1139 int unit_merge(Unit
*u
, Unit
*other
) {
1144 assert(u
->manager
== other
->manager
);
1145 assert(u
->type
!= _UNIT_TYPE_INVALID
);
1147 other
= unit_follow_merge(other
);
1152 if (u
->type
!= other
->type
)
1155 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
1158 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
1161 if (!streq_ptr(u
->instance
, other
->instance
))
1170 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1173 /* Make reservations to ensure merge_dependencies() won't fail. We don't rollback reservations if we
1174 * fail. We don't have a way to undo reservations. A reservation is not a leak. */
1175 r
= unit_reserve_dependencies(u
, other
);
1180 r
= unit_merge_names(u
, other
);
1184 /* Redirect all references */
1185 while (other
->refs_by_target
)
1186 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
1188 /* Merge dependencies */
1189 unit_merge_dependencies(u
, other
);
1191 other
->load_state
= UNIT_MERGED
;
1192 other
->merged_into
= u
;
1194 if (!u
->activation_details
)
1195 u
->activation_details
= activation_details_ref(other
->activation_details
);
1197 /* If there is still some data attached to the other node, we
1198 * don't need it anymore, and can free it. */
1199 if (other
->load_state
!= UNIT_STUB
)
1200 if (UNIT_VTABLE(other
)->done
)
1201 UNIT_VTABLE(other
)->done(other
);
1203 unit_add_to_dbus_queue(u
);
1204 unit_add_to_cleanup_queue(other
);
1209 int unit_merge_by_name(Unit
*u
, const char *name
) {
1210 _cleanup_free_
char *s
= NULL
;
1214 /* Either add name to u, or if a unit with name already exists, merge it with u.
1215 * If name is a template, do the same for name@instance, where instance is u's instance. */
1220 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
1224 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
1231 other
= manager_get_unit(u
->manager
, name
);
1233 return unit_merge(u
, other
);
1235 return unit_add_name(u
, name
);
1238 Unit
* unit_follow_merge(Unit
*u
) {
1241 while (u
->load_state
== UNIT_MERGED
)
1242 assert_se(u
= u
->merged_into
);
1247 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
1253 /* Unlike unit_add_dependency() or friends, this always returns 0 on success. */
1255 if (c
->working_directory
&& !c
->working_directory_missing_ok
) {
1256 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
1261 if (c
->root_directory
) {
1262 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
1267 if (c
->root_image
) {
1268 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
1273 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
1274 if (!u
->manager
->prefix
[dt
])
1277 for (size_t i
= 0; i
< c
->directories
[dt
].n_items
; i
++) {
1278 _cleanup_free_
char *p
= NULL
;
1280 p
= path_join(u
->manager
->prefix
[dt
], c
->directories
[dt
].items
[i
].path
);
1284 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1290 if (!MANAGER_IS_SYSTEM(u
->manager
))
1293 /* For the following three directory types we need write access, and /var/ is possibly on the root
1294 * fs. Hence order after systemd-remount-fs.service, to ensure things are writable. */
1295 if (c
->directories
[EXEC_DIRECTORY_STATE
].n_items
> 0 ||
1296 c
->directories
[EXEC_DIRECTORY_CACHE
].n_items
> 0 ||
1297 c
->directories
[EXEC_DIRECTORY_LOGS
].n_items
> 0) {
1298 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_REMOUNT_FS_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1303 if (c
->private_tmp
) {
1305 /* FIXME: for now we make a special case for /tmp and add a weak dependency on
1306 * tmp.mount so /tmp being masked is supported. However there's no reason to treat
1307 * /tmp specifically and masking other mount units should be handled more
1308 * gracefully too, see PR#16894. */
1309 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "tmp.mount", true, UNIT_DEPENDENCY_FILE
);
1313 r
= unit_require_mounts_for(u
, "/var/tmp", UNIT_DEPENDENCY_FILE
);
1317 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1322 if (c
->root_image
) {
1323 /* We need to wait for /dev/loopX to appear when doing RootImage=, hence let's add an
1324 * implicit dependency on udev */
1326 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_UDEVD_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1331 if (!IN_SET(c
->std_output
,
1332 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1333 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1334 !IN_SET(c
->std_error
,
1335 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1336 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1340 /* If syslog or kernel logging is requested (or log namespacing is), make sure our own logging daemon
1343 if (c
->log_namespace
) {
1344 _cleanup_free_
char *socket_unit
= NULL
, *varlink_socket_unit
= NULL
;
1346 r
= unit_name_build_from_type("systemd-journald", c
->log_namespace
, UNIT_SOCKET
, &socket_unit
);
1350 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1354 r
= unit_name_build_from_type("systemd-journald-varlink", c
->log_namespace
, UNIT_SOCKET
, &varlink_socket_unit
);
1358 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, varlink_socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1362 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1369 const char* unit_description(Unit
*u
) {
1373 return u
->description
;
1375 return strna(u
->id
);
1378 const char* unit_status_string(Unit
*u
, char **ret_combined_buffer
) {
1382 /* Return u->id, u->description, or "{u->id} - {u->description}".
1383 * Versions with u->description are only used if it is set.
1384 * The last option is used if configured and the caller provided the 'ret_combined_buffer'
1387 * Note that *ret_combined_buffer may be set to NULL. */
1389 if (!u
->description
||
1390 u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
||
1391 (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& !ret_combined_buffer
) ||
1392 streq(u
->description
, u
->id
)) {
1394 if (ret_combined_buffer
)
1395 *ret_combined_buffer
= NULL
;
1399 if (ret_combined_buffer
) {
1400 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
) {
1401 *ret_combined_buffer
= strjoin(u
->id
, " - ", u
->description
);
1402 if (*ret_combined_buffer
)
1403 return *ret_combined_buffer
;
1404 log_oom(); /* Fall back to ->description */
1406 *ret_combined_buffer
= NULL
;
1409 return u
->description
;
1412 /* Common implementation for multiple backends */
1413 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1418 /* Load a .{service,socket,...} file */
1419 r
= unit_load_fragment(u
);
1423 if (u
->load_state
== UNIT_STUB
) {
1424 if (fragment_required
)
1427 u
->load_state
= UNIT_LOADED
;
1430 /* Load drop-in directory data. If u is an alias, we might be reloading the
1431 * target unit needlessly. But we cannot be sure which drops-ins have already
1432 * been loaded and which not, at least without doing complicated book-keeping,
1433 * so let's always reread all drop-ins. */
1434 r
= unit_load_dropin(unit_follow_merge(u
));
1438 if (u
->source_path
) {
1441 if (stat(u
->source_path
, &st
) >= 0)
1442 u
->source_mtime
= timespec_load(&st
.st_mtim
);
1444 u
->source_mtime
= 0;
1450 void unit_add_to_target_deps_queue(Unit
*u
) {
1451 Manager
*m
= ASSERT_PTR(ASSERT_PTR(u
)->manager
);
1453 if (u
->in_target_deps_queue
)
1456 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1457 u
->in_target_deps_queue
= true;
1460 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1464 if (target
->type
!= UNIT_TARGET
)
1467 /* Only add the dependency if both units are loaded, so that
1468 * that loop check below is reliable */
1469 if (u
->load_state
!= UNIT_LOADED
||
1470 target
->load_state
!= UNIT_LOADED
)
1473 /* If either side wants no automatic dependencies, then let's
1475 if (!u
->default_dependencies
||
1476 !target
->default_dependencies
)
1479 /* Don't create loops */
1480 if (unit_has_dependency(target
, UNIT_ATOM_BEFORE
, u
))
1483 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1486 static int unit_add_slice_dependencies(Unit
*u
) {
1490 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1493 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1494 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1496 UnitDependencyMask mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1498 slice
= UNIT_GET_SLICE(u
);
1500 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, slice
, true, mask
);
1502 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1505 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1508 static int unit_add_mount_dependencies(Unit
*u
) {
1509 UnitDependencyInfo di
;
1511 bool changed
= false;
1516 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
) {
1517 char prefix
[strlen(path
) + 1];
1519 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1520 _cleanup_free_
char *p
= NULL
;
1523 r
= unit_name_from_path(prefix
, ".mount", &p
);
1525 continue; /* If the path cannot be converted to a mount unit name, then it's
1526 * not manageable as a unit by systemd, and hence we don't need a
1527 * dependency on it. Let's thus silently ignore the issue. */
1531 m
= manager_get_unit(u
->manager
, p
);
1533 /* Make sure to load the mount unit if it exists. If so the dependencies on
1534 * this unit will be added later during the loading of the mount unit. */
1535 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1541 if (m
->load_state
!= UNIT_LOADED
)
1544 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1547 changed
= changed
|| r
> 0;
1549 if (m
->fragment_path
) {
1550 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1553 changed
= changed
|| r
> 0;
1561 static int unit_add_oomd_dependencies(Unit
*u
) {
1567 if (!u
->default_dependencies
)
1570 c
= unit_get_cgroup_context(u
);
1574 wants_oomd
= (c
->moom_swap
== MANAGED_OOM_KILL
|| c
->moom_mem_pressure
== MANAGED_OOM_KILL
);
1578 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "systemd-oomd.service", true, UNIT_DEPENDENCY_FILE
);
1581 static int unit_add_startup_units(Unit
*u
) {
1582 if (!unit_has_startup_cgroup_constraints(u
))
1585 return set_ensure_put(&u
->manager
->startup_units
, NULL
, u
);
1588 static int unit_validate_on_failure_job_mode(
1590 const char *job_mode_setting
,
1592 const char *dependency_name
,
1593 UnitDependencyAtom atom
) {
1595 Unit
*other
, *found
= NULL
;
1597 if (job_mode
!= JOB_ISOLATE
)
1600 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
1603 else if (found
!= other
)
1604 return log_unit_error_errno(
1605 u
, SYNTHETIC_ERRNO(ENOEXEC
),
1606 "More than one %s dependencies specified but %sisolate set. Refusing.",
1607 dependency_name
, job_mode_setting
);
1613 int unit_load(Unit
*u
) {
1618 if (u
->in_load_queue
) {
1619 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1620 u
->in_load_queue
= false;
1623 if (u
->type
== _UNIT_TYPE_INVALID
)
1626 if (u
->load_state
!= UNIT_STUB
)
1629 if (u
->transient_file
) {
1630 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1631 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1633 r
= fflush_and_check(u
->transient_file
);
1637 u
->transient_file
= safe_fclose(u
->transient_file
);
1638 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1641 r
= UNIT_VTABLE(u
)->load(u
);
1645 assert(u
->load_state
!= UNIT_STUB
);
1647 if (u
->load_state
== UNIT_LOADED
) {
1648 unit_add_to_target_deps_queue(u
);
1650 r
= unit_add_slice_dependencies(u
);
1654 r
= unit_add_mount_dependencies(u
);
1658 r
= unit_add_oomd_dependencies(u
);
1662 r
= unit_add_startup_units(u
);
1666 r
= unit_validate_on_failure_job_mode(u
, "OnSuccessJobMode=", u
->on_success_job_mode
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
);
1670 r
= unit_validate_on_failure_job_mode(u
, "OnFailureJobMode=", u
->on_failure_job_mode
, "OnFailure=", UNIT_ATOM_ON_FAILURE
);
1674 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1675 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1677 /* We finished loading, let's ensure our parents recalculate the members mask */
1678 unit_invalidate_cgroup_members_masks(u
);
1681 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1683 unit_add_to_dbus_queue(unit_follow_merge(u
));
1684 unit_add_to_gc_queue(u
);
1685 (void) manager_varlink_send_managed_oom_update(u
);
1690 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code
1691 * should hence return ENOEXEC to ensure units are placed in this state after loading. */
1693 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1694 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1698 /* Record the timestamp on the cache, so that if the cache gets updated between now and the next time
1699 * an attempt is made to load this unit, we know we need to check again. */
1700 if (u
->load_state
== UNIT_NOT_FOUND
)
1701 u
->fragment_not_found_timestamp_hash
= u
->manager
->unit_cache_timestamp_hash
;
1703 unit_add_to_dbus_queue(u
);
1704 unit_add_to_gc_queue(u
);
1706 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1710 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1715 if (u
&& !unit_log_level_test(u
, level
))
1716 return -ERRNO_VALUE(error
);
1718 va_start(ap
, format
);
1720 r
= log_object_internalv(level
, error
, file
, line
, func
,
1721 u
->manager
->unit_log_field
,
1723 u
->manager
->invocation_log_field
,
1724 u
->invocation_id_string
,
1727 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1733 static bool unit_test_condition(Unit
*u
) {
1734 _cleanup_strv_free_
char **env
= NULL
;
1739 dual_timestamp_get(&u
->condition_timestamp
);
1741 r
= manager_get_effective_environment(u
->manager
, &env
);
1743 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1744 u
->condition_result
= true;
1746 u
->condition_result
= condition_test_list(
1749 condition_type_to_string
,
1753 unit_add_to_dbus_queue(u
);
1754 return u
->condition_result
;
1757 static bool unit_test_assert(Unit
*u
) {
1758 _cleanup_strv_free_
char **env
= NULL
;
1763 dual_timestamp_get(&u
->assert_timestamp
);
1765 r
= manager_get_effective_environment(u
->manager
, &env
);
1767 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1768 u
->assert_result
= CONDITION_ERROR
;
1770 u
->assert_result
= condition_test_list(
1773 assert_type_to_string
,
1777 unit_add_to_dbus_queue(u
);
1778 return u
->assert_result
;
1781 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *format
, const char *ident
) {
1782 if (log_get_show_color()) {
1783 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& strchr(ident
, ' '))
1784 ident
= strjoina(ANSI_HIGHLIGHT
, u
->id
, ANSI_NORMAL
, " - ", u
->description
);
1786 ident
= strjoina(ANSI_HIGHLIGHT
, ident
, ANSI_NORMAL
);
1789 DISABLE_WARNING_FORMAT_NONLITERAL
;
1790 manager_status_printf(u
->manager
, status_type
, status
, format
, ident
);
1794 int unit_test_start_limit(Unit
*u
) {
1799 if (ratelimit_below(&u
->start_ratelimit
)) {
1800 u
->start_limit_hit
= false;
1804 log_unit_warning(u
, "Start request repeated too quickly.");
1805 u
->start_limit_hit
= true;
1807 reason
= strjoina("unit ", u
->id
, " failed");
1809 emergency_action(u
->manager
, u
->start_limit_action
,
1810 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1811 u
->reboot_arg
, -1, reason
);
1816 bool unit_shall_confirm_spawn(Unit
*u
) {
1819 if (manager_is_confirm_spawn_disabled(u
->manager
))
1822 /* For some reasons units remaining in the same process group
1823 * as PID 1 fail to acquire the console even if it's not used
1824 * by any process. So skip the confirmation question for them. */
1825 return !unit_get_exec_context(u
)->same_pgrp
;
1828 static bool unit_verify_deps(Unit
*u
) {
1833 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined
1834 * with After=. We do not check Requires= or Requisite= here as they only should have an effect on
1835 * the job processing, but do not have any effect afterwards. We don't check BindsTo= dependencies
1836 * that are not used in conjunction with After= as for them any such check would make things entirely
1839 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
1841 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
))
1844 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1845 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1853 /* Errors that aren't really errors:
1854 * -EALREADY: Unit is already started.
1855 * -ECOMM: Condition failed
1856 * -EAGAIN: An operation is already in progress. Retry later.
1858 * Errors that are real errors:
1859 * -EBADR: This unit type does not support starting.
1860 * -ECANCELED: Start limit hit, too many requests for now
1861 * -EPROTO: Assert failed
1862 * -EINVAL: Unit not loaded
1863 * -EOPNOTSUPP: Unit type not supported
1864 * -ENOLINK: The necessary dependencies are not fulfilled.
1865 * -ESTALE: This unit has been started before and can't be started a second time
1866 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1868 int unit_start(Unit
*u
, ActivationDetails
*details
) {
1869 UnitActiveState state
;
1875 /* Let's hold off running start jobs for mount units when /proc/self/mountinfo monitor is rate limited. */
1876 if (u
->type
== UNIT_MOUNT
&& sd_event_source_is_ratelimited(u
->manager
->mount_event_source
))
1879 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1880 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1881 * waiting is finished. */
1882 state
= unit_active_state(u
);
1883 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1885 if (state
== UNIT_MAINTENANCE
)
1888 /* Units that aren't loaded cannot be started */
1889 if (u
->load_state
!= UNIT_LOADED
)
1892 /* Refuse starting scope units more than once */
1893 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1896 /* If the conditions failed, don't do anything at all. If we already are activating this call might
1897 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1898 * recheck the condition in that case. */
1899 if (state
!= UNIT_ACTIVATING
&&
1900 !unit_test_condition(u
))
1901 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition failed. Not starting unit.");
1903 /* If the asserts failed, fail the entire job */
1904 if (state
!= UNIT_ACTIVATING
&&
1905 !unit_test_assert(u
))
1906 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1908 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1909 * condition checks, so that we rather return condition check errors (which are usually not
1910 * considered a true failure) than "not supported" errors (which are considered a failure).
1912 if (!unit_type_supported(u
->type
))
1915 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1916 * should have taken care of this already, but let's check this here again. After all, our
1917 * dependencies might not be in effect anymore, due to a reload or due to an unmet condition. */
1918 if (!unit_verify_deps(u
))
1921 /* Forward to the main object, if we aren't it. */
1922 following
= unit_following(u
);
1924 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1925 return unit_start(following
, details
);
1928 /* Check our ability to start early so that failure conditions don't cause us to enter a busy loop. */
1929 if (UNIT_VTABLE(u
)->can_start
) {
1930 r
= UNIT_VTABLE(u
)->can_start(u
);
1935 /* If it is stopped, but we cannot start it, then fail */
1936 if (!UNIT_VTABLE(u
)->start
)
1939 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1940 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1941 * waits for a holdoff timer to elapse before it will start again. */
1943 unit_add_to_dbus_queue(u
);
1944 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1946 if (!u
->activation_details
) /* Older details object wins */
1947 u
->activation_details
= activation_details_ref(details
);
1949 return UNIT_VTABLE(u
)->start(u
);
1952 bool unit_can_start(Unit
*u
) {
1955 if (u
->load_state
!= UNIT_LOADED
)
1958 if (!unit_type_supported(u
->type
))
1961 /* Scope units may be started only once */
1962 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
1965 return !!UNIT_VTABLE(u
)->start
;
1968 bool unit_can_isolate(Unit
*u
) {
1971 return unit_can_start(u
) &&
1976 * -EBADR: This unit type does not support stopping.
1977 * -EALREADY: Unit is already stopped.
1978 * -EAGAIN: An operation is already in progress. Retry later.
1980 int unit_stop(Unit
*u
) {
1981 UnitActiveState state
;
1986 state
= unit_active_state(u
);
1987 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1990 following
= unit_following(u
);
1992 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1993 return unit_stop(following
);
1996 if (!UNIT_VTABLE(u
)->stop
)
1999 unit_add_to_dbus_queue(u
);
2000 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2002 return UNIT_VTABLE(u
)->stop(u
);
2005 bool unit_can_stop(Unit
*u
) {
2008 /* Note: if we return true here, it does not mean that the unit may be successfully stopped.
2009 * Extrinsic units follow external state and they may stop following external state changes
2010 * (hence we return true here), but an attempt to do this through the manager will fail. */
2012 if (!unit_type_supported(u
->type
))
2018 return !!UNIT_VTABLE(u
)->stop
;
2022 * -EBADR: This unit type does not support reloading.
2023 * -ENOEXEC: Unit is not started.
2024 * -EAGAIN: An operation is already in progress. Retry later.
2026 int unit_reload(Unit
*u
) {
2027 UnitActiveState state
;
2032 if (u
->load_state
!= UNIT_LOADED
)
2035 if (!unit_can_reload(u
))
2038 state
= unit_active_state(u
);
2039 if (state
== UNIT_RELOADING
)
2042 if (state
!= UNIT_ACTIVE
)
2043 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
), "Unit cannot be reloaded because it is inactive.");
2045 following
= unit_following(u
);
2047 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
2048 return unit_reload(following
);
2051 unit_add_to_dbus_queue(u
);
2053 if (!UNIT_VTABLE(u
)->reload
) {
2054 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
2055 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), 0);
2059 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2061 return UNIT_VTABLE(u
)->reload(u
);
2064 bool unit_can_reload(Unit
*u
) {
2067 if (UNIT_VTABLE(u
)->can_reload
)
2068 return UNIT_VTABLE(u
)->can_reload(u
);
2070 if (unit_has_dependency(u
, UNIT_ATOM_PROPAGATES_RELOAD_TO
, NULL
))
2073 return UNIT_VTABLE(u
)->reload
;
2076 bool unit_is_unneeded(Unit
*u
) {
2080 if (!u
->stop_when_unneeded
)
2083 /* Don't clean up while the unit is transitioning or is even inactive. */
2084 if (unit_active_state(u
) != UNIT_ACTIVE
)
2089 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_PINS_STOP_WHEN_UNNEEDED
) {
2090 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
2091 * restart, then don't clean this one up. */
2096 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2099 if (unit_will_restart(other
))
2106 bool unit_is_upheld_by_active(Unit
*u
, Unit
**ret_culprit
) {
2111 /* Checks if the unit needs to be started because it currently is not running, but some other unit
2112 * that is active declared an Uphold= dependencies on it */
2114 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)) || u
->job
) {
2116 *ret_culprit
= NULL
;
2120 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_START_STEADILY
) {
2124 if (UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
2126 *ret_culprit
= other
;
2132 *ret_culprit
= NULL
;
2136 bool unit_is_bound_by_inactive(Unit
*u
, Unit
**ret_culprit
) {
2141 /* Checks whether this unit is bound to another unit that is inactive, i.e. whether we should stop
2142 * because the other unit is down. */
2144 if (unit_active_state(u
) != UNIT_ACTIVE
|| u
->job
) {
2145 /* Don't clean up while the unit is transitioning or is even inactive. */
2147 *ret_culprit
= NULL
;
2151 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
2155 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
))) {
2157 *ret_culprit
= other
;
2164 *ret_culprit
= NULL
;
2168 static void check_unneeded_dependencies(Unit
*u
) {
2172 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2174 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_STOP_WHEN_UNNEEDED_QUEUE
)
2175 unit_submit_to_stop_when_unneeded_queue(other
);
2178 static void check_uphold_dependencies(Unit
*u
) {
2182 /* Add all units this unit depends on to the queue that processes Uphold= behaviour. */
2184 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_START_WHEN_UPHELD_QUEUE
)
2185 unit_submit_to_start_when_upheld_queue(other
);
2188 static void check_bound_by_dependencies(Unit
*u
) {
2192 /* Add all units this unit depends on to the queue that processes BindsTo= stop behaviour. */
2194 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_CANNOT_BE_ACTIVE_WITHOUT_QUEUE
)
2195 unit_submit_to_stop_when_bound_queue(other
);
2198 static void retroactively_start_dependencies(Unit
*u
) {
2202 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2204 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_REPLACE
) /* Requires= + BindsTo= */
2205 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2206 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2207 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2209 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_FAIL
) /* Wants= */
2210 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2211 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2212 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2214 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_START
) /* Conflicts= (and inverse) */
2215 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2216 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2219 static void retroactively_stop_dependencies(Unit
*u
) {
2223 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2225 /* Pull down units which are bound to us recursively if enabled */
2226 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_STOP
) /* BoundBy= */
2227 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2228 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2231 void unit_start_on_failure(
2233 const char *dependency_name
,
2234 UnitDependencyAtom atom
,
2242 assert(dependency_name
);
2243 assert(IN_SET(atom
, UNIT_ATOM_ON_SUCCESS
, UNIT_ATOM_ON_FAILURE
));
2245 /* Act on OnFailure= and OnSuccess= dependencies */
2247 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
2248 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2251 log_unit_info(u
, "Triggering %s dependencies.", dependency_name
);
2255 r
= manager_add_job(u
->manager
, JOB_START
, other
, job_mode
, NULL
, &error
, NULL
);
2257 log_unit_warning_errno(
2258 u
, r
, "Failed to enqueue %s job, ignoring: %s",
2259 dependency_name
, bus_error_message(&error
, r
));
2264 log_unit_debug(u
, "Triggering %s dependencies done (%i %s).",
2265 dependency_name
, n_jobs
, n_jobs
== 1 ? "job" : "jobs");
2268 void unit_trigger_notify(Unit
*u
) {
2273 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_TRIGGERED_BY
)
2274 if (UNIT_VTABLE(other
)->trigger_notify
)
2275 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2278 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2279 if (condition_notice
&& log_level
> LOG_NOTICE
)
2281 if (condition_info
&& log_level
> LOG_INFO
)
2286 static int unit_log_resources(Unit
*u
) {
2287 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4];
2288 bool any_traffic
= false, have_ip_accounting
= false, any_io
= false, have_io_accounting
= false;
2289 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
, *rr
= NULL
, *wr
= NULL
;
2290 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a threshold */
2291 size_t n_message_parts
= 0, n_iovec
= 0;
2292 char* message_parts
[1 + 2 + 2 + 1], *t
;
2293 nsec_t nsec
= NSEC_INFINITY
;
2295 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2296 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2297 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2298 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2299 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2301 const char* const io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2302 [CGROUP_IO_READ_BYTES
] = "IO_METRIC_READ_BYTES",
2303 [CGROUP_IO_WRITE_BYTES
] = "IO_METRIC_WRITE_BYTES",
2304 [CGROUP_IO_READ_OPERATIONS
] = "IO_METRIC_READ_OPERATIONS",
2305 [CGROUP_IO_WRITE_OPERATIONS
] = "IO_METRIC_WRITE_OPERATIONS",
2310 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2311 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2312 * information and the complete data in structured fields. */
2314 (void) unit_get_cpu_usage(u
, &nsec
);
2315 if (nsec
!= NSEC_INFINITY
) {
2316 /* Format the CPU time for inclusion in the structured log message */
2317 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2321 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2323 /* Format the CPU time for inclusion in the human language message string */
2324 t
= strjoin("consumed ", FORMAT_TIMESPAN(nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
), " CPU time");
2330 message_parts
[n_message_parts
++] = t
;
2332 log_level
= raise_level(log_level
,
2333 nsec
> MENTIONWORTHY_CPU_NSEC
,
2334 nsec
> NOTICEWORTHY_CPU_NSEC
);
2337 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2338 uint64_t value
= UINT64_MAX
;
2340 assert(io_fields
[k
]);
2342 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2343 if (value
== UINT64_MAX
)
2346 have_io_accounting
= true;
2350 /* Format IO accounting data for inclusion in the structured log message */
2351 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2355 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2357 /* Format the IO accounting data for inclusion in the human language message string, but only
2358 * for the bytes counters (and not for the operations counters) */
2359 if (k
== CGROUP_IO_READ_BYTES
) {
2361 rr
= strjoin("read ", strna(FORMAT_BYTES(value
)), " from disk");
2366 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2368 wr
= strjoin("written ", strna(FORMAT_BYTES(value
)), " to disk");
2375 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2376 log_level
= raise_level(log_level
,
2377 value
> MENTIONWORTHY_IO_BYTES
,
2378 value
> NOTICEWORTHY_IO_BYTES
);
2381 if (have_io_accounting
) {
2384 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2386 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2391 k
= strdup("no IO");
2397 message_parts
[n_message_parts
++] = k
;
2401 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2402 uint64_t value
= UINT64_MAX
;
2404 assert(ip_fields
[m
]);
2406 (void) unit_get_ip_accounting(u
, m
, &value
);
2407 if (value
== UINT64_MAX
)
2410 have_ip_accounting
= true;
2414 /* Format IP accounting data for inclusion in the structured log message */
2415 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2419 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2421 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2422 * bytes counters (and not for the packets counters) */
2423 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2425 igress
= strjoin("received ", strna(FORMAT_BYTES(value
)), " IP traffic");
2430 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2432 egress
= strjoin("sent ", strna(FORMAT_BYTES(value
)), " IP traffic");
2439 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2440 log_level
= raise_level(log_level
,
2441 value
> MENTIONWORTHY_IP_BYTES
,
2442 value
> NOTICEWORTHY_IP_BYTES
);
2445 /* This check is here because it is the earliest point following all possible log_level assignments. If
2446 * log_level is assigned anywhere after this point, move this check. */
2447 if (!unit_log_level_test(u
, log_level
)) {
2452 if (have_ip_accounting
) {
2455 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2457 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2462 k
= strdup("no IP traffic");
2468 message_parts
[n_message_parts
++] = k
;
2472 /* Is there any accounting data available at all? */
2478 if (n_message_parts
== 0)
2479 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2481 _cleanup_free_
char *joined
= NULL
;
2483 message_parts
[n_message_parts
] = NULL
;
2485 joined
= strv_join(message_parts
, ", ");
2491 joined
[0] = ascii_toupper(joined
[0]);
2492 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2495 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2496 * and hence don't increase n_iovec for them */
2497 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2498 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2500 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2501 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2503 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2504 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2506 log_unit_struct_iovec(u
, log_level
, iovec
, n_iovec
+ 4);
2510 for (size_t i
= 0; i
< n_message_parts
; i
++)
2511 free(message_parts
[i
]);
2513 for (size_t i
= 0; i
< n_iovec
; i
++)
2514 free(iovec
[i
].iov_base
);
2520 static void unit_update_on_console(Unit
*u
) {
2525 b
= unit_needs_console(u
);
2526 if (u
->on_console
== b
)
2531 manager_ref_console(u
->manager
);
2533 manager_unref_console(u
->manager
);
2536 static void unit_emit_audit_start(Unit
*u
) {
2539 if (u
->type
!= UNIT_SERVICE
)
2542 /* Write audit record if we have just finished starting up */
2543 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2547 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2550 if (u
->type
!= UNIT_SERVICE
)
2554 /* Write audit record if we have just finished shutting down */
2555 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2556 u
->in_audit
= false;
2558 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2559 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2561 if (state
== UNIT_INACTIVE
)
2562 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2566 static bool unit_process_job(Job
*j
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2567 bool unexpected
= false;
2572 if (j
->state
== JOB_WAITING
)
2574 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2576 job_add_to_run_queue(j
);
2578 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2579 * hence needs to invalidate jobs. */
2584 case JOB_VERIFY_ACTIVE
:
2586 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2587 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2588 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2591 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2592 if (ns
== UNIT_FAILED
)
2593 result
= JOB_FAILED
;
2597 job_finish_and_invalidate(j
, result
, true, false);
2604 case JOB_RELOAD_OR_START
:
2605 case JOB_TRY_RELOAD
:
2607 if (j
->state
== JOB_RUNNING
) {
2608 if (ns
== UNIT_ACTIVE
)
2609 job_finish_and_invalidate(j
, (flags
& UNIT_NOTIFY_RELOAD_FAILURE
) ? JOB_FAILED
: JOB_DONE
, true, false);
2610 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2613 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2614 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2622 case JOB_TRY_RESTART
:
2624 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2625 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2626 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2628 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2634 assert_not_reached();
2640 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2645 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2646 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2648 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2649 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2650 * remounted this function will be called too! */
2654 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2655 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2656 unit_add_to_dbus_queue(u
);
2658 /* Update systemd-oomd on the property/state change */
2660 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2662 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2663 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2664 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2665 * have the information on the property. Thus, indiscriminately send an update. */
2666 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2667 (void) manager_varlink_send_managed_oom_update(u
);
2670 /* Update timestamps for state changes */
2671 if (!MANAGER_IS_RELOADING(m
)) {
2672 dual_timestamp_get(&u
->state_change_timestamp
);
2674 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2675 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2676 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2677 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2679 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2680 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2681 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2682 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2685 /* Keep track of failed units */
2686 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2688 /* Make sure the cgroup and state files are always removed when we become inactive */
2689 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2690 SET_FLAG(u
->markers
,
2691 (1u << UNIT_MARKER_NEEDS_RELOAD
)|(1u << UNIT_MARKER_NEEDS_RESTART
),
2693 unit_prune_cgroup(u
);
2694 unit_unlink_state_files(u
);
2695 } else if (ns
!= os
&& ns
== UNIT_RELOADING
)
2696 SET_FLAG(u
->markers
, 1u << UNIT_MARKER_NEEDS_RELOAD
, false);
2698 unit_update_on_console(u
);
2700 if (!MANAGER_IS_RELOADING(m
)) {
2703 /* Let's propagate state changes to the job */
2705 unexpected
= unit_process_job(u
->job
, ns
, flags
);
2709 /* If this state change happened without being requested by a job, then let's retroactively start or
2710 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2711 * additional jobs just because something is already activated. */
2714 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2715 retroactively_start_dependencies(u
);
2716 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2717 retroactively_stop_dependencies(u
);
2720 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2721 log_unit_debug(u
, "Unit entered failed state.");
2723 if (!(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2724 unit_start_on_failure(u
, "OnFailure=", UNIT_ATOM_ON_FAILURE
, u
->on_failure_job_mode
);
2727 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2728 /* This unit just finished starting up */
2730 unit_emit_audit_start(u
);
2731 manager_send_unit_plymouth(m
, u
);
2734 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2735 /* This unit just stopped/failed. */
2737 unit_emit_audit_stop(u
, ns
);
2738 unit_log_resources(u
);
2741 if (ns
== UNIT_INACTIVE
&& !IN_SET(os
, UNIT_FAILED
, UNIT_INACTIVE
, UNIT_MAINTENANCE
) &&
2742 !(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2743 unit_start_on_failure(u
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
, u
->on_success_job_mode
);
2746 manager_recheck_journal(m
);
2747 manager_recheck_dbus(m
);
2749 unit_trigger_notify(u
);
2751 if (!MANAGER_IS_RELOADING(m
)) {
2752 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2753 reason
= strjoina("unit ", u
->id
, " failed");
2754 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2755 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2756 reason
= strjoina("unit ", u
->id
, " succeeded");
2757 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2761 /* And now, add the unit or depending units to various queues that will act on the new situation if
2762 * needed. These queues generally check for continuous state changes rather than events (like most of
2763 * the state propagation above), and do work deferred instead of instantly, since they typically
2764 * don't want to run during reloading, and usually involve checking combined state of multiple units
2767 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2768 /* Stop unneeded units and bound-by units regardless if going down was expected or not */
2769 check_unneeded_dependencies(u
);
2770 check_bound_by_dependencies(u
);
2772 /* Maybe someone wants us to remain up? */
2773 unit_submit_to_start_when_upheld_queue(u
);
2775 /* Maybe the unit should be GC'ed now? */
2776 unit_add_to_gc_queue(u
);
2779 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2780 /* Start uphold units regardless if going up was expected or not */
2781 check_uphold_dependencies(u
);
2783 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2784 unit_submit_to_stop_when_unneeded_queue(u
);
2786 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens
2787 * when something BindsTo= to a Type=oneshot unit, as these units go directly from starting to
2788 * inactive, without ever entering started.) */
2789 unit_submit_to_stop_when_bound_queue(u
);
2793 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2797 assert(pid_is_valid(pid
));
2799 /* Watch a specific PID */
2801 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2802 * opportunity to remove any stalled references to this PID as they can be created
2803 * easily (when watching a process which is not our direct child). */
2805 manager_unwatch_pid(u
->manager
, pid
);
2807 r
= set_ensure_allocated(&u
->pids
, NULL
);
2811 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2815 /* First try, let's add the unit keyed by "pid". */
2816 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2822 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2823 * to an array of Units rather than just a Unit), lists us already. */
2825 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2827 for (; array
[n
]; n
++)
2831 if (found
) /* Found it already? if so, do nothing */
2836 /* Allocate a new array */
2837 new_array
= new(Unit
*, n
+ 2);
2841 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2843 new_array
[n
+1] = NULL
;
2845 /* Add or replace the old array */
2846 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2857 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2864 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2868 assert(pid_is_valid(pid
));
2870 /* First let's drop the unit in case it's keyed as "pid". */
2871 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2873 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2874 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2876 /* Let's iterate through the array, dropping our own entry */
2879 for (size_t n
= 0; array
[n
]; n
++)
2881 array
[m
++] = array
[n
];
2885 /* The array is now empty, remove the entire entry */
2886 assert_se(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2891 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2894 void unit_unwatch_all_pids(Unit
*u
) {
2897 while (!set_isempty(u
->pids
))
2898 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2900 u
->pids
= set_free(u
->pids
);
2903 static void unit_tidy_watch_pids(Unit
*u
) {
2904 pid_t except1
, except2
;
2909 /* Cleans dead PIDs from our list */
2911 except1
= unit_main_pid(u
);
2912 except2
= unit_control_pid(u
);
2914 SET_FOREACH(e
, u
->pids
) {
2915 pid_t pid
= PTR_TO_PID(e
);
2917 if (pid
== except1
|| pid
== except2
)
2920 if (!pid_is_unwaited(pid
))
2921 unit_unwatch_pid(u
, pid
);
2925 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2926 Unit
*u
= ASSERT_PTR(userdata
);
2930 unit_tidy_watch_pids(u
);
2931 unit_watch_all_pids(u
);
2933 /* If the PID set is empty now, then let's finish this off. */
2934 unit_synthesize_cgroup_empty_event(u
);
2939 int unit_enqueue_rewatch_pids(Unit
*u
) {
2944 if (!u
->cgroup_path
)
2947 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2950 if (r
> 0) /* On unified we can use proper notifications */
2953 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2954 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2955 * involves issuing kill(pid, 0) on all processes we watch. */
2957 if (!u
->rewatch_pids_event_source
) {
2958 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2960 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2962 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2964 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2966 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
2968 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2970 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2973 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2975 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2980 void unit_dequeue_rewatch_pids(Unit
*u
) {
2984 if (!u
->rewatch_pids_event_source
)
2987 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
2989 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
2991 u
->rewatch_pids_event_source
= sd_event_source_disable_unref(u
->rewatch_pids_event_source
);
2994 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2996 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
3000 case JOB_VERIFY_ACTIVE
:
3003 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
3004 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
3009 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
3010 * external events), hence it makes no sense to permit enqueuing such a request either. */
3011 return !u
->perpetual
;
3014 case JOB_TRY_RESTART
:
3015 return unit_can_stop(u
) && unit_can_start(u
);
3018 case JOB_TRY_RELOAD
:
3019 return unit_can_reload(u
);
3021 case JOB_RELOAD_OR_START
:
3022 return unit_can_reload(u
) && unit_can_start(u
);
3025 assert_not_reached();
3029 int unit_add_dependency(
3034 UnitDependencyMask mask
) {
3036 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
3037 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
3038 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
3039 [UNIT_WANTS
] = UNIT_WANTED_BY
,
3040 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
3041 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
3042 [UNIT_UPHOLDS
] = UNIT_UPHELD_BY
,
3043 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
3044 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
3045 [UNIT_WANTED_BY
] = UNIT_WANTS
,
3046 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
3047 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
3048 [UNIT_UPHELD_BY
] = UNIT_UPHOLDS
,
3049 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
3050 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
3051 [UNIT_BEFORE
] = UNIT_AFTER
,
3052 [UNIT_AFTER
] = UNIT_BEFORE
,
3053 [UNIT_ON_SUCCESS
] = UNIT_ON_SUCCESS_OF
,
3054 [UNIT_ON_SUCCESS_OF
] = UNIT_ON_SUCCESS
,
3055 [UNIT_ON_FAILURE
] = UNIT_ON_FAILURE_OF
,
3056 [UNIT_ON_FAILURE_OF
] = UNIT_ON_FAILURE
,
3057 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
3058 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
3059 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3060 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3061 [UNIT_PROPAGATES_STOP_TO
] = UNIT_STOP_PROPAGATED_FROM
,
3062 [UNIT_STOP_PROPAGATED_FROM
] = UNIT_PROPAGATES_STOP_TO
,
3063 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
, /* symmetric! 👓 */
3064 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3065 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3066 [UNIT_IN_SLICE
] = UNIT_SLICE_OF
,
3067 [UNIT_SLICE_OF
] = UNIT_IN_SLICE
,
3069 Unit
*original_u
= u
, *original_other
= other
;
3070 UnitDependencyAtom a
;
3073 /* Helper to know whether sending a notification is necessary or not: if the dependency is already
3074 * there, no need to notify! */
3075 bool notify
, notify_other
= false;
3078 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3081 u
= unit_follow_merge(u
);
3082 other
= unit_follow_merge(other
);
3083 a
= unit_dependency_to_atom(d
);
3086 /* We won't allow dependencies on ourselves. We will not consider them an error however. */
3088 unit_maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
3092 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3095 /* Note that ordering a device unit after a unit is permitted since it allows to start its job
3096 * running timeout at a specific time. */
3097 if (FLAGS_SET(a
, UNIT_ATOM_BEFORE
) && other
->type
== UNIT_DEVICE
) {
3098 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3102 if (FLAGS_SET(a
, UNIT_ATOM_ON_FAILURE
) && !UNIT_VTABLE(u
)->can_fail
) {
3103 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3107 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERS
) && !UNIT_VTABLE(u
)->can_trigger
)
3108 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3109 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3110 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERED_BY
) && !UNIT_VTABLE(other
)->can_trigger
)
3111 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3112 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3114 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && other
->type
!= UNIT_SLICE
)
3115 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3116 "Requested dependency Slice=%s refused (%s is not a slice unit).", other
->id
, other
->id
);
3117 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && u
->type
!= UNIT_SLICE
)
3118 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3119 "Requested dependency SliceOf=%s refused (%s is not a slice unit).", other
->id
, u
->id
);
3121 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && !UNIT_HAS_CGROUP_CONTEXT(u
))
3122 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3123 "Requested dependency Slice=%s refused (%s is not a cgroup unit).", other
->id
, u
->id
);
3125 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && !UNIT_HAS_CGROUP_CONTEXT(other
))
3126 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3127 "Requested dependency SliceOf=%s refused (%s is not a cgroup unit).", other
->id
, other
->id
);
3129 r
= unit_add_dependency_hashmap(&u
->dependencies
, d
, other
, mask
, 0);
3134 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
3135 r
= unit_add_dependency_hashmap(&other
->dependencies
, inverse_table
[d
], u
, 0, mask
);
3138 notify_other
= r
> 0;
3141 if (add_reference
) {
3142 r
= unit_add_dependency_hashmap(&u
->dependencies
, UNIT_REFERENCES
, other
, mask
, 0);
3145 notify
= notify
|| r
> 0;
3147 r
= unit_add_dependency_hashmap(&other
->dependencies
, UNIT_REFERENCED_BY
, u
, 0, mask
);
3150 notify_other
= notify_other
|| r
> 0;
3154 unit_add_to_dbus_queue(u
);
3156 unit_add_to_dbus_queue(other
);
3158 return notify
|| notify_other
;
3161 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3166 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3170 s
= unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3174 return r
> 0 || s
> 0;
3177 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3185 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3192 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3194 _cleanup_free_
char *i
= NULL
;
3196 r
= unit_name_to_prefix(u
->id
, &i
);
3200 r
= unit_name_replace_instance(name
, i
, buf
);
3209 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3210 _cleanup_free_
char *buf
= NULL
;
3217 r
= resolve_template(u
, name
, &buf
, &name
);
3221 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3224 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3228 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3231 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3232 _cleanup_free_
char *buf
= NULL
;
3239 r
= resolve_template(u
, name
, &buf
, &name
);
3243 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3246 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3250 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3253 int set_unit_path(const char *p
) {
3254 /* This is mostly for debug purposes */
3255 return RET_NERRNO(setenv("SYSTEMD_UNIT_PATH", p
, 1));
3258 char *unit_dbus_path(Unit
*u
) {
3264 return unit_dbus_path_from_name(u
->id
);
3267 char *unit_dbus_path_invocation_id(Unit
*u
) {
3270 if (sd_id128_is_null(u
->invocation_id
))
3273 return unit_dbus_path_from_name(u
->invocation_id_string
);
3276 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3281 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3283 if (sd_id128_equal(u
->invocation_id
, id
))
3286 if (!sd_id128_is_null(u
->invocation_id
))
3287 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3289 if (sd_id128_is_null(id
)) {
3294 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3298 u
->invocation_id
= id
;
3299 sd_id128_to_string(id
, u
->invocation_id_string
);
3301 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3308 u
->invocation_id
= SD_ID128_NULL
;
3309 u
->invocation_id_string
[0] = 0;
3313 int unit_set_slice(Unit
*u
, Unit
*slice
) {
3319 /* Sets the unit slice if it has not been set before. Is extra careful, to only allow this for units
3320 * that actually have a cgroup context. Also, we don't allow to set this for slices (since the parent
3321 * slice is derived from the name). Make sure the unit we set is actually a slice. */
3323 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3326 if (u
->type
== UNIT_SLICE
)
3329 if (unit_active_state(u
) != UNIT_INACTIVE
)
3332 if (slice
->type
!= UNIT_SLICE
)
3335 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3336 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3339 if (UNIT_GET_SLICE(u
) == slice
)
3342 /* Disallow slice changes if @u is already bound to cgroups */
3343 if (UNIT_GET_SLICE(u
) && u
->cgroup_realized
)
3346 /* Remove any slices assigned prior; we should only have one UNIT_IN_SLICE dependency */
3347 if (UNIT_GET_SLICE(u
))
3348 unit_remove_dependencies(u
, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3350 r
= unit_add_dependency(u
, UNIT_IN_SLICE
, slice
, true, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3357 int unit_set_default_slice(Unit
*u
) {
3358 const char *slice_name
;
3364 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3367 if (UNIT_GET_SLICE(u
))
3371 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3373 /* Implicitly place all instantiated units in their
3374 * own per-template slice */
3376 r
= unit_name_to_prefix(u
->id
, &prefix
);
3380 /* The prefix is already escaped, but it might include
3381 * "-" which has a special meaning for slice units,
3382 * hence escape it here extra. */
3383 escaped
= unit_name_escape(prefix
);
3387 if (MANAGER_IS_SYSTEM(u
->manager
))
3388 slice_name
= strjoina("system-", escaped
, ".slice");
3390 slice_name
= strjoina("app-", escaped
, ".slice");
3392 } else if (unit_is_extrinsic(u
))
3393 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3394 * the root slice. They don't really belong in one of the subslices. */
3395 slice_name
= SPECIAL_ROOT_SLICE
;
3397 else if (MANAGER_IS_SYSTEM(u
->manager
))
3398 slice_name
= SPECIAL_SYSTEM_SLICE
;
3400 slice_name
= SPECIAL_APP_SLICE
;
3402 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3406 return unit_set_slice(u
, slice
);
3409 const char *unit_slice_name(Unit
*u
) {
3413 slice
= UNIT_GET_SLICE(u
);
3420 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3421 _cleanup_free_
char *t
= NULL
;
3428 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3431 if (unit_has_name(u
, t
))
3434 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3435 assert(r
< 0 || *_found
!= u
);
3439 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3440 const char *new_owner
;
3441 Unit
*u
= ASSERT_PTR(userdata
);
3446 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3448 bus_log_parse_error(r
);
3452 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3453 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3458 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3459 const sd_bus_error
*e
;
3460 const char *new_owner
;
3461 Unit
*u
= ASSERT_PTR(userdata
);
3466 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3468 e
= sd_bus_message_get_error(message
);
3470 if (!sd_bus_error_has_name(e
, "org.freedesktop.DBus.Error.NameHasNoOwner")) {
3471 r
= sd_bus_error_get_errno(e
);
3472 log_unit_error_errno(u
, r
,
3473 "Unexpected error response from GetNameOwner(): %s",
3474 bus_error_message(e
, r
));
3479 r
= sd_bus_message_read(message
, "s", &new_owner
);
3481 return bus_log_parse_error(r
);
3483 assert(!isempty(new_owner
));
3486 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3487 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3492 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3500 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3503 match
= strjoina("type='signal',"
3504 "sender='org.freedesktop.DBus',"
3505 "path='/org/freedesktop/DBus',"
3506 "interface='org.freedesktop.DBus',"
3507 "member='NameOwnerChanged',"
3508 "arg0='", name
, "'");
3510 r
= sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3514 r
= sd_bus_call_method_async(
3516 &u
->get_name_owner_slot
,
3517 "org.freedesktop.DBus",
3518 "/org/freedesktop/DBus",
3519 "org.freedesktop.DBus",
3521 get_name_owner_handler
,
3525 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3529 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3533 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3539 /* Watch a specific name on the bus. We only support one unit
3540 * watching each name for now. */
3542 if (u
->manager
->api_bus
) {
3543 /* If the bus is already available, install the match directly.
3544 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3545 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3547 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3550 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3552 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3553 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3554 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3560 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3564 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3565 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3566 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3569 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3570 _cleanup_free_
char *e
= NULL
;
3576 /* Adds in links to the device node that this unit is based on */
3580 if (!is_device_path(what
))
3583 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3584 if (!unit_type_supported(UNIT_DEVICE
))
3587 r
= unit_name_from_path(what
, ".device", &e
);
3591 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3595 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3596 dep
= UNIT_BINDS_TO
;
3598 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3599 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3600 device
, true, mask
);
3603 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3604 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3612 if (!path_startswith(what
, "/dev/"))
3615 /* If we don't support devices, then also don't bother with blockdev@.target */
3616 if (!unit_type_supported(UNIT_DEVICE
))
3619 r
= unit_name_path_escape(what
, &escaped
);
3623 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3627 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3630 int unit_coldplug(Unit
*u
) {
3635 /* Make sure we don't enter a loop, when coldplugging recursively. */
3639 u
->coldplugged
= true;
3641 STRV_FOREACH(i
, u
->deserialized_refs
) {
3642 q
= bus_unit_track_add_name(u
, *i
);
3643 if (q
< 0 && r
>= 0)
3646 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3648 if (UNIT_VTABLE(u
)->coldplug
) {
3649 q
= UNIT_VTABLE(u
)->coldplug(u
);
3650 if (q
< 0 && r
>= 0)
3655 q
= job_coldplug(u
->job
);
3656 if (q
< 0 && r
>= 0)
3660 q
= job_coldplug(u
->nop_job
);
3661 if (q
< 0 && r
>= 0)
3668 void unit_catchup(Unit
*u
) {
3671 if (UNIT_VTABLE(u
)->catchup
)
3672 UNIT_VTABLE(u
)->catchup(u
);
3674 unit_cgroup_catchup(u
);
3677 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3683 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3684 * are never out-of-date. */
3685 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3688 if (stat(path
, &st
) < 0)
3689 /* What, cannot access this anymore? */
3693 /* For masked files check if they are still so */
3694 return !null_or_empty(&st
);
3696 /* For non-empty files check the mtime */
3697 return timespec_load(&st
.st_mtim
) > mtime
;
3702 bool unit_need_daemon_reload(Unit
*u
) {
3703 _cleanup_strv_free_
char **t
= NULL
;
3707 /* For unit files, we allow masking… */
3708 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3709 u
->load_state
== UNIT_MASKED
))
3712 /* Source paths should not be masked… */
3713 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3716 if (u
->load_state
== UNIT_LOADED
)
3717 (void) unit_find_dropin_paths(u
, &t
);
3718 if (!strv_equal(u
->dropin_paths
, t
))
3721 /* … any drop-ins that are masked are simply omitted from the list. */
3722 STRV_FOREACH(path
, u
->dropin_paths
)
3723 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3729 void unit_reset_failed(Unit
*u
) {
3732 if (UNIT_VTABLE(u
)->reset_failed
)
3733 UNIT_VTABLE(u
)->reset_failed(u
);
3735 ratelimit_reset(&u
->start_ratelimit
);
3736 u
->start_limit_hit
= false;
3739 Unit
*unit_following(Unit
*u
) {
3742 if (UNIT_VTABLE(u
)->following
)
3743 return UNIT_VTABLE(u
)->following(u
);
3748 bool unit_stop_pending(Unit
*u
) {
3751 /* This call does check the current state of the unit. It's
3752 * hence useful to be called from state change calls of the
3753 * unit itself, where the state isn't updated yet. This is
3754 * different from unit_inactive_or_pending() which checks both
3755 * the current state and for a queued job. */
3757 return unit_has_job_type(u
, JOB_STOP
);
3760 bool unit_inactive_or_pending(Unit
*u
) {
3763 /* Returns true if the unit is inactive or going down */
3765 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3768 if (unit_stop_pending(u
))
3774 bool unit_active_or_pending(Unit
*u
) {
3777 /* Returns true if the unit is active or going up */
3779 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3783 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3789 bool unit_will_restart_default(Unit
*u
) {
3792 return unit_has_job_type(u
, JOB_START
);
3795 bool unit_will_restart(Unit
*u
) {
3798 if (!UNIT_VTABLE(u
)->will_restart
)
3801 return UNIT_VTABLE(u
)->will_restart(u
);
3804 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3806 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3807 assert(SIGNAL_VALID(signo
));
3809 if (!UNIT_VTABLE(u
)->kill
)
3812 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3815 void unit_notify_cgroup_oom(Unit
*u
, bool managed_oom
) {
3818 if (UNIT_VTABLE(u
)->notify_cgroup_oom
)
3819 UNIT_VTABLE(u
)->notify_cgroup_oom(u
, managed_oom
);
3822 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3823 _cleanup_set_free_ Set
*pid_set
= NULL
;
3826 pid_set
= set_new(NULL
);
3830 /* Exclude the main/control pids from being killed via the cgroup */
3832 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3837 if (control_pid
> 0) {
3838 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3843 return TAKE_PTR(pid_set
);
3846 static int kill_common_log(pid_t pid
, int signo
, void *userdata
) {
3847 _cleanup_free_
char *comm
= NULL
;
3848 Unit
*u
= ASSERT_PTR(userdata
);
3850 (void) get_process_comm(pid
, &comm
);
3851 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
3852 signal_to_string(signo
), pid
, strna(comm
));
3857 int unit_kill_common(
3863 sd_bus_error
*error
) {
3866 bool killed
= false;
3868 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
3869 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
3870 * stop a service ourselves. */
3872 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3874 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3876 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3879 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3880 if (control_pid
< 0)
3881 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3882 if (control_pid
== 0)
3883 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3886 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3887 if (control_pid
> 0) {
3888 _cleanup_free_
char *comm
= NULL
;
3889 (void) get_process_comm(control_pid
, &comm
);
3891 if (kill(control_pid
, signo
) < 0) {
3892 /* Report this failure both to the logs and to the client */
3893 sd_bus_error_set_errnof(
3895 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
3896 signal_to_string(signo
), control_pid
, strna(comm
));
3897 r
= log_unit_warning_errno(
3899 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
3900 signal_to_string(signo
), control_pid
, strna(comm
));
3902 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
3903 signal_to_string(signo
), control_pid
, strna(comm
));
3908 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3910 _cleanup_free_
char *comm
= NULL
;
3911 (void) get_process_comm(main_pid
, &comm
);
3913 if (kill(main_pid
, signo
) < 0) {
3915 sd_bus_error_set_errnof(
3917 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
3918 signal_to_string(signo
), main_pid
, strna(comm
));
3920 r
= log_unit_warning_errno(
3922 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
3923 signal_to_string(signo
), main_pid
, strna(comm
));
3925 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
3926 signal_to_string(signo
), main_pid
, strna(comm
));
3931 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3932 _cleanup_set_free_ Set
*pid_set
= NULL
;
3935 /* Exclude the main/control pids from being killed via the cgroup */
3936 pid_set
= unit_pid_set(main_pid
, control_pid
);
3940 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
3942 if (!IN_SET(q
, -ESRCH
, -ENOENT
)) {
3944 sd_bus_error_set_errnof(
3946 "Failed to send signal SIG%s to auxiliary processes: %m",
3947 signal_to_string(signo
));
3949 r
= log_unit_warning_errno(
3951 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
3952 signal_to_string(signo
));
3958 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
3959 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
3960 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
3965 int unit_following_set(Unit
*u
, Set
**s
) {
3969 if (UNIT_VTABLE(u
)->following_set
)
3970 return UNIT_VTABLE(u
)->following_set(u
, s
);
3976 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3981 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3982 r
= unit_file_get_state(
3983 u
->manager
->unit_file_scope
,
3986 &u
->unit_file_state
);
3988 u
->unit_file_state
= UNIT_FILE_BAD
;
3991 return u
->unit_file_state
;
3994 int unit_get_unit_file_preset(Unit
*u
) {
3997 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3998 u
->unit_file_preset
= unit_file_query_preset(
3999 u
->manager
->unit_file_scope
,
4001 basename(u
->fragment_path
),
4004 return u
->unit_file_preset
;
4007 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
4013 unit_ref_unset(ref
);
4015 ref
->source
= source
;
4016 ref
->target
= target
;
4017 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
4021 void unit_ref_unset(UnitRef
*ref
) {
4027 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
4028 * be unreferenced now. */
4029 unit_add_to_gc_queue(ref
->target
);
4031 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
4032 ref
->source
= ref
->target
= NULL
;
4035 static int user_from_unit_name(Unit
*u
, char **ret
) {
4037 static const uint8_t hash_key
[] = {
4038 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4039 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4042 _cleanup_free_
char *n
= NULL
;
4045 r
= unit_name_to_prefix(u
->id
, &n
);
4049 if (valid_user_group_name(n
, 0)) {
4054 /* If we can't use the unit name as a user name, then let's hash it and use that */
4055 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4061 int unit_patch_contexts(Unit
*u
) {
4068 /* Patch in the manager defaults into the exec and cgroup
4069 * contexts, _after_ the rest of the settings have been
4072 ec
= unit_get_exec_context(u
);
4074 /* This only copies in the ones that need memory */
4075 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
4076 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4077 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4082 if (MANAGER_IS_USER(u
->manager
) &&
4083 !ec
->working_directory
) {
4085 r
= get_home_dir(&ec
->working_directory
);
4089 /* Allow user services to run, even if the
4090 * home directory is missing */
4091 ec
->working_directory_missing_ok
= true;
4094 if (ec
->private_devices
)
4095 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4097 if (ec
->protect_kernel_modules
)
4098 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4100 if (ec
->protect_kernel_logs
)
4101 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4103 if (ec
->protect_clock
)
4104 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4106 if (ec
->dynamic_user
) {
4108 r
= user_from_unit_name(u
, &ec
->user
);
4114 ec
->group
= strdup(ec
->user
);
4119 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4120 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4123 ec
->private_tmp
= true;
4124 ec
->remove_ipc
= true;
4125 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4126 if (ec
->protect_home
== PROTECT_HOME_NO
)
4127 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4129 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4131 ec
->no_new_privileges
= true;
4132 ec
->restrict_suid_sgid
= true;
4135 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++)
4136 exec_directory_sort(ec
->directories
+ dt
);
4139 cc
= unit_get_cgroup_context(u
);
4142 if (ec
->private_devices
&&
4143 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4144 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4146 /* Only add these if needed, as they imply that everything else is blocked. */
4147 if (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
) {
4148 if (ec
->root_image
|| ec
->mount_images
) {
4150 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4151 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4152 r
= cgroup_add_device_allow(cc
, p
, "rw");
4156 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4157 r
= cgroup_add_device_allow(cc
, p
, "rwm");
4162 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4163 * Same for mapper and verity. */
4164 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4165 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4171 if (ec
->protect_clock
) {
4172 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4182 ExecContext
*unit_get_exec_context(const Unit
*u
) {
4189 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4193 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4196 KillContext
*unit_get_kill_context(Unit
*u
) {
4203 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4207 return (KillContext
*) ((uint8_t*) u
+ offset
);
4210 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4216 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4220 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4223 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4229 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4233 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4236 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4239 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4242 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4243 return u
->manager
->lookup_paths
.transient
;
4245 if (flags
& UNIT_PERSISTENT
)
4246 return u
->manager
->lookup_paths
.persistent_control
;
4248 if (flags
& UNIT_RUNTIME
)
4249 return u
->manager
->lookup_paths
.runtime_control
;
4254 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4255 assert(!FLAGS_SET(flags
, UNIT_ESCAPE_EXEC_SYNTAX
| UNIT_ESCAPE_C
));
4257 _cleanup_free_
char *t
= NULL
;
4262 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the
4263 * allocated return buffer pointer is also written to *buf, except if no escaping was necessary, in
4264 * which case *buf is set to NULL, and the input pointer is returned as-is. This means the return
4265 * value always contains a properly escaped version, but *buf when passed only contains a pointer if
4266 * an allocation was necessary. If *buf is not specified, then the return value always needs to be
4267 * freed. Callers can use this to optimize memory allocations. */
4269 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4270 t
= specifier_escape(s
);
4277 /* We either do c-escaping or shell-escaping, to additionally escape characters that we parse for
4278 * ExecStart= and friend, i.e. '$' and ';' and quotes. */
4280 if (flags
& UNIT_ESCAPE_EXEC_SYNTAX
) {
4281 char *t2
= shell_escape(s
, "$;'\"");
4284 free_and_replace(t
, t2
);
4288 } else if (flags
& UNIT_ESCAPE_C
) {
4289 char *t2
= cescape(s
);
4292 free_and_replace(t
, t2
);
4302 return TAKE_PTR(t
) ?: strdup(s
);
4305 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4306 _cleanup_free_
char *result
= NULL
;
4309 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command
4310 * lines in a way suitable for ExecStart= stanzas. */
4312 STRV_FOREACH(i
, l
) {
4313 _cleanup_free_
char *buf
= NULL
;
4318 p
= unit_escape_setting(*i
, flags
, &buf
);
4322 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4323 if (!GREEDY_REALLOC(result
, n
+ a
+ 1))
4337 if (!GREEDY_REALLOC(result
, n
+ 1))
4342 return TAKE_PTR(result
);
4345 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4346 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4347 const char *dir
, *wrapped
;
4354 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4357 data
= unit_escape_setting(data
, flags
, &escaped
);
4361 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4362 * previous section header is the same */
4364 if (flags
& UNIT_PRIVATE
) {
4365 if (!UNIT_VTABLE(u
)->private_section
)
4368 if (!u
->transient_file
|| u
->last_section_private
< 0)
4369 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4370 else if (u
->last_section_private
== 0)
4371 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4373 if (!u
->transient_file
|| u
->last_section_private
< 0)
4374 data
= strjoina("[Unit]\n", data
);
4375 else if (u
->last_section_private
> 0)
4376 data
= strjoina("\n[Unit]\n", data
);
4379 if (u
->transient_file
) {
4380 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4381 * write to the transient unit file. */
4382 fputs(data
, u
->transient_file
);
4384 if (!endswith(data
, "\n"))
4385 fputc('\n', u
->transient_file
);
4387 /* Remember which section we wrote this entry to */
4388 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4392 dir
= unit_drop_in_dir(u
, flags
);
4396 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4397 "# or an equivalent operation. Do not edit.\n",
4401 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4405 (void) mkdir_p_label(p
, 0755);
4407 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4408 * recreate the cache after every drop-in we write. */
4409 if (u
->manager
->unit_path_cache
) {
4410 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4415 r
= write_string_file_atomic_label(q
, wrapped
);
4419 r
= strv_push(&u
->dropin_paths
, q
);
4424 strv_uniq(u
->dropin_paths
);
4426 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4431 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4432 _cleanup_free_
char *p
= NULL
;
4440 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4443 va_start(ap
, format
);
4444 r
= vasprintf(&p
, format
, ap
);
4450 return unit_write_setting(u
, flags
, name
, p
);
4453 int unit_make_transient(Unit
*u
) {
4454 _cleanup_free_
char *path
= NULL
;
4459 if (!UNIT_VTABLE(u
)->can_transient
)
4462 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4464 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4468 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4469 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4471 RUN_WITH_UMASK(0022) {
4472 f
= fopen(path
, "we");
4477 safe_fclose(u
->transient_file
);
4478 u
->transient_file
= f
;
4480 free_and_replace(u
->fragment_path
, path
);
4482 u
->source_path
= mfree(u
->source_path
);
4483 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4484 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4486 u
->load_state
= UNIT_STUB
;
4488 u
->transient
= true;
4490 unit_add_to_dbus_queue(u
);
4491 unit_add_to_gc_queue(u
);
4493 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4499 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4500 _cleanup_free_
char *comm
= NULL
;
4502 (void) get_process_comm(pid
, &comm
);
4504 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4505 only, like for example systemd's own PAM stub process. */
4506 if (comm
&& comm
[0] == '(')
4509 log_unit_notice(userdata
,
4510 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4513 signal_to_string(sig
));
4518 static int operation_to_signal(const KillContext
*c
, KillOperation k
, bool *noteworthy
) {
4523 case KILL_TERMINATE
:
4524 case KILL_TERMINATE_AND_LOG
:
4525 *noteworthy
= false;
4526 return c
->kill_signal
;
4529 *noteworthy
= false;
4530 return restart_kill_signal(c
);
4534 return c
->final_kill_signal
;
4538 return c
->watchdog_signal
;
4541 assert_not_reached();
4545 int unit_kill_context(
4551 bool main_pid_alien
) {
4553 bool wait_for_exit
= false, send_sighup
;
4554 cg_kill_log_func_t log_func
= NULL
;
4560 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
4561 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
4562 * which is used for user-requested killing of unit processes. */
4564 if (c
->kill_mode
== KILL_NONE
)
4568 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4570 log_func
= log_kill
;
4574 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4579 log_func(main_pid
, sig
, u
);
4581 r
= kill_and_sigcont(main_pid
, sig
);
4582 if (r
< 0 && r
!= -ESRCH
) {
4583 _cleanup_free_
char *comm
= NULL
;
4584 (void) get_process_comm(main_pid
, &comm
);
4586 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4588 if (!main_pid_alien
)
4589 wait_for_exit
= true;
4591 if (r
!= -ESRCH
&& send_sighup
)
4592 (void) kill(main_pid
, SIGHUP
);
4596 if (control_pid
> 0) {
4598 log_func(control_pid
, sig
, u
);
4600 r
= kill_and_sigcont(control_pid
, sig
);
4601 if (r
< 0 && r
!= -ESRCH
) {
4602 _cleanup_free_
char *comm
= NULL
;
4603 (void) get_process_comm(control_pid
, &comm
);
4605 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4607 wait_for_exit
= true;
4609 if (r
!= -ESRCH
&& send_sighup
)
4610 (void) kill(control_pid
, SIGHUP
);
4614 if (u
->cgroup_path
&&
4615 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4616 _cleanup_set_free_ Set
*pid_set
= NULL
;
4618 /* Exclude the main/control pids from being killed via the cgroup */
4619 pid_set
= unit_pid_set(main_pid
, control_pid
);
4623 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4625 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4629 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4630 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
4634 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4635 * we are running in a container or if this is a delegation unit, simply because cgroup
4636 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4637 * of containers it can be confused easily by left-over directories in the cgroup — which
4638 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4639 * there we get proper events. Hence rely on them. */
4641 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4642 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4643 wait_for_exit
= true;
4648 pid_set
= unit_pid_set(main_pid
, control_pid
);
4652 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4661 return wait_for_exit
;
4664 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4670 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these
4671 * paths in the unit (from the path to the UnitDependencyInfo structure indicating how to the
4672 * dependency came to be). However, we build a prefix table for all possible prefixes so that new
4673 * appearing mount units can easily determine which units to make themselves a dependency of. */
4675 if (!path_is_absolute(path
))
4678 if (hashmap_contains(u
->requires_mounts_for
, path
)) /* Exit quickly if the path is already covered. */
4681 _cleanup_free_
char *p
= strdup(path
);
4685 /* Use the canonical form of the path as the stored key. We call path_is_normalized()
4686 * only after simplification, since path_is_normalized() rejects paths with '.'.
4687 * path_is_normalized() also verifies that the path fits in PATH_MAX. */
4688 path
= path_simplify(p
);
4690 if (!path_is_normalized(path
))
4693 UnitDependencyInfo di
= {
4697 r
= hashmap_ensure_put(&u
->requires_mounts_for
, &path_hash_ops
, p
, di
.data
);
4701 TAKE_PTR(p
); /* path remains a valid pointer to the string stored in the hashmap */
4703 char prefix
[strlen(path
) + 1];
4704 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4707 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4709 _cleanup_free_
char *q
= NULL
;
4711 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4723 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4739 int unit_setup_exec_runtime(Unit
*u
) {
4745 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4748 /* Check if there already is an ExecRuntime for this unit? */
4749 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4753 /* Try to get it from somebody else */
4754 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_JOINS_NAMESPACE_OF
) {
4755 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4760 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4763 int unit_setup_dynamic_creds(Unit
*u
) {
4765 DynamicCreds
*dcreds
;
4770 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4772 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4774 ec
= unit_get_exec_context(u
);
4777 if (!ec
->dynamic_user
)
4780 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4783 bool unit_type_supported(UnitType t
) {
4784 if (_unlikely_(t
< 0))
4786 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4789 if (!unit_vtable
[t
]->supported
)
4792 return unit_vtable
[t
]->supported();
4795 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4801 if (!unit_log_level_test(u
, LOG_NOTICE
))
4804 r
= dir_is_empty(where
, /* ignore_hidden_or_backup= */ false);
4805 if (r
> 0 || r
== -ENOTDIR
)
4808 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4812 log_unit_struct(u
, LOG_NOTICE
,
4813 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4814 LOG_UNIT_INVOCATION_ID(u
),
4815 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4819 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4820 _cleanup_free_
char *canonical_where
= NULL
;
4826 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
4828 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4832 /* We will happily ignore a trailing slash (or any redundant slashes) */
4833 if (path_equal(where
, canonical_where
))
4836 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4837 log_unit_struct(u
, LOG_ERR
,
4838 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4839 LOG_UNIT_INVOCATION_ID(u
),
4840 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4846 bool unit_is_pristine(Unit
*u
) {
4849 /* Check if the unit already exists or is already around, in a number of different ways. Note that to
4850 * cater for unit types such as slice, we are generally fine with units that are marked UNIT_LOADED
4851 * even though nothing was actually loaded, as those unit types don't require a file on disk.
4853 * Note that we don't check for drop-ins here, because we allow drop-ins for transient units
4854 * identically to non-transient units, both unit-specific and hierarchical. E.g. for a-b-c.service:
4855 * service.d/….conf, a-.service.d/….conf, a-b-.service.d/….conf, a-b-c.service.d/….conf.
4858 return IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) &&
4859 !u
->fragment_path
&&
4865 pid_t
unit_control_pid(Unit
*u
) {
4868 if (UNIT_VTABLE(u
)->control_pid
)
4869 return UNIT_VTABLE(u
)->control_pid(u
);
4874 pid_t
unit_main_pid(Unit
*u
) {
4877 if (UNIT_VTABLE(u
)->main_pid
)
4878 return UNIT_VTABLE(u
)->main_pid(u
);
4883 static void unit_unref_uid_internal(
4887 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4891 assert(_manager_unref_uid
);
4893 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4894 * gid_t are actually the same time, with the same validity rules.
4896 * Drops a reference to UID/GID from a unit. */
4898 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4899 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4901 if (!uid_is_valid(*ref_uid
))
4904 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4905 *ref_uid
= UID_INVALID
;
4908 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4909 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4912 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4913 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4916 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4919 unit_unref_uid(u
, destroy_now
);
4920 unit_unref_gid(u
, destroy_now
);
4923 static int unit_ref_uid_internal(
4928 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4934 assert(uid_is_valid(uid
));
4935 assert(_manager_ref_uid
);
4937 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4938 * are actually the same type, and have the same validity rules.
4940 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4941 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4944 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4945 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4947 if (*ref_uid
== uid
)
4950 if (uid_is_valid(*ref_uid
)) /* Already set? */
4953 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4961 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4962 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4965 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4966 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4969 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4974 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4976 if (uid_is_valid(uid
)) {
4977 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4982 if (gid_is_valid(gid
)) {
4983 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4986 unit_unref_uid(u
, false);
4992 return r
> 0 || q
> 0;
4995 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
5001 c
= unit_get_exec_context(u
);
5003 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
5005 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
5010 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
5015 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
5016 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
5017 * objects when no service references the UID/GID anymore. */
5019 r
= unit_ref_uid_gid(u
, uid
, gid
);
5021 unit_add_to_dbus_queue(u
);
5024 int unit_acquire_invocation_id(Unit
*u
) {
5030 r
= sd_id128_randomize(&id
);
5032 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
5034 r
= unit_set_invocation_id(u
, id
);
5036 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
5038 unit_add_to_dbus_queue(u
);
5042 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
5048 /* Copy parameters from manager */
5049 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
5053 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
5054 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
5055 p
->prefix
= u
->manager
->prefix
;
5056 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
5058 /* Copy parameters from unit */
5059 p
->cgroup_path
= u
->cgroup_path
;
5060 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
5062 p
->received_credentials_directory
= u
->manager
->received_credentials_directory
;
5063 p
->received_encrypted_credentials_directory
= u
->manager
->received_encrypted_credentials_directory
;
5068 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
5074 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5075 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5077 (void) unit_realize_cgroup(u
);
5079 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5083 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
);
5084 (void) ignore_signals(SIGPIPE
);
5086 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5088 if (u
->cgroup_path
) {
5089 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5091 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", empty_to_root(u
->cgroup_path
));
5099 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5106 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5110 int ret
= EXIT_SUCCESS
;
5112 STRV_FOREACH(i
, paths
) {
5113 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5115 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5123 r
= unit_watch_pid(u
, pid
, true);
5131 static void unit_update_dependency_mask(Hashmap
*deps
, Unit
*other
, UnitDependencyInfo di
) {
5135 if (di
.origin_mask
== 0 && di
.destination_mask
== 0)
5136 /* No bit set anymore, let's drop the whole entry */
5137 assert_se(hashmap_remove(deps
, other
));
5139 /* Mask was reduced, let's update the entry */
5140 assert_se(hashmap_update(deps
, other
, di
.data
) == 0);
5143 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5147 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5152 HASHMAP_FOREACH(deps
, u
->dependencies
) {
5156 UnitDependencyInfo di
;
5161 HASHMAP_FOREACH_KEY(di
.data
, other
, deps
) {
5162 Hashmap
*other_deps
;
5164 if (FLAGS_SET(~mask
, di
.origin_mask
))
5167 di
.origin_mask
&= ~mask
;
5168 unit_update_dependency_mask(deps
, other
, di
);
5170 /* We updated the dependency from our unit to the other unit now. But most
5171 * dependencies imply a reverse dependency. Hence, let's delete that one
5172 * too. For that we go through all dependency types on the other unit and
5173 * delete all those which point to us and have the right mask set. */
5175 HASHMAP_FOREACH(other_deps
, other
->dependencies
) {
5176 UnitDependencyInfo dj
;
5178 dj
.data
= hashmap_get(other_deps
, u
);
5179 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5182 dj
.destination_mask
&= ~mask
;
5183 unit_update_dependency_mask(other_deps
, u
, dj
);
5186 unit_add_to_gc_queue(other
);
5188 /* The unit 'other' may not be wanted by the unit 'u'. */
5189 unit_submit_to_stop_when_unneeded_queue(other
);
5199 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5206 if (MANAGER_IS_SYSTEM(u
->manager
))
5207 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5209 _cleanup_free_
char *user_path
= NULL
;
5210 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5213 p
= strjoin(user_path
, u
->id
);
5223 static int unit_export_invocation_id(Unit
*u
) {
5224 _cleanup_free_
char *p
= NULL
;
5229 if (u
->exported_invocation_id
)
5232 if (sd_id128_is_null(u
->invocation_id
))
5235 r
= unit_get_invocation_path(u
, &p
);
5237 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5239 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5241 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5243 u
->exported_invocation_id
= true;
5247 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5255 if (u
->exported_log_level_max
)
5258 if (c
->log_level_max
< 0)
5261 assert(c
->log_level_max
<= 7);
5263 buf
[0] = '0' + c
->log_level_max
;
5266 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5267 r
= symlink_atomic(buf
, p
);
5269 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5271 u
->exported_log_level_max
= true;
5275 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5276 _cleanup_close_
int fd
= -1;
5277 struct iovec
*iovec
;
5284 if (u
->exported_log_extra_fields
)
5287 if (c
->n_log_extra_fields
<= 0)
5290 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5291 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5293 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5294 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5296 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5297 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5300 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5301 pattern
= strjoina(p
, ".XXXXXX");
5303 fd
= mkostemp_safe(pattern
);
5305 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5307 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5309 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5313 (void) fchmod(fd
, 0644);
5315 if (rename(pattern
, p
) < 0) {
5316 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5320 u
->exported_log_extra_fields
= true;
5324 (void) unlink(pattern
);
5328 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5329 _cleanup_free_
char *buf
= NULL
;
5336 if (u
->exported_log_ratelimit_interval
)
5339 if (c
->log_ratelimit_interval_usec
== 0)
5342 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5344 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5347 r
= symlink_atomic(buf
, p
);
5349 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5351 u
->exported_log_ratelimit_interval
= true;
5355 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5356 _cleanup_free_
char *buf
= NULL
;
5363 if (u
->exported_log_ratelimit_burst
)
5366 if (c
->log_ratelimit_burst
== 0)
5369 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5371 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5374 r
= symlink_atomic(buf
, p
);
5376 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5378 u
->exported_log_ratelimit_burst
= true;
5382 void unit_export_state_files(Unit
*u
) {
5383 const ExecContext
*c
;
5390 if (MANAGER_IS_TEST_RUN(u
->manager
))
5393 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5394 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5395 * the IPC system itself and PID 1 also log to the journal.
5397 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5398 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5399 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5400 * namespace at least.
5402 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5403 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5406 (void) unit_export_invocation_id(u
);
5408 if (!MANAGER_IS_SYSTEM(u
->manager
))
5411 c
= unit_get_exec_context(u
);
5413 (void) unit_export_log_level_max(u
, c
);
5414 (void) unit_export_log_extra_fields(u
, c
);
5415 (void) unit_export_log_ratelimit_interval(u
, c
);
5416 (void) unit_export_log_ratelimit_burst(u
, c
);
5420 void unit_unlink_state_files(Unit
*u
) {
5428 /* Undoes the effect of unit_export_state() */
5430 if (u
->exported_invocation_id
) {
5431 _cleanup_free_
char *invocation_path
= NULL
;
5432 int r
= unit_get_invocation_path(u
, &invocation_path
);
5434 (void) unlink(invocation_path
);
5435 u
->exported_invocation_id
= false;
5439 if (!MANAGER_IS_SYSTEM(u
->manager
))
5442 if (u
->exported_log_level_max
) {
5443 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5446 u
->exported_log_level_max
= false;
5449 if (u
->exported_log_extra_fields
) {
5450 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5453 u
->exported_log_extra_fields
= false;
5456 if (u
->exported_log_ratelimit_interval
) {
5457 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5460 u
->exported_log_ratelimit_interval
= false;
5463 if (u
->exported_log_ratelimit_burst
) {
5464 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5467 u
->exported_log_ratelimit_burst
= false;
5471 int unit_prepare_exec(Unit
*u
) {
5476 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5477 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5478 r
= bpf_firewall_load_custom(u
);
5482 /* Prepares everything so that we can fork of a process for this unit */
5484 (void) unit_realize_cgroup(u
);
5486 if (u
->reset_accounting
) {
5487 (void) unit_reset_accounting(u
);
5488 u
->reset_accounting
= false;
5491 unit_export_state_files(u
);
5493 r
= unit_setup_exec_runtime(u
);
5497 r
= unit_setup_dynamic_creds(u
);
5504 static bool ignore_leftover_process(const char *comm
) {
5505 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5508 int unit_log_leftover_process_start(pid_t pid
, int sig
, void *userdata
) {
5509 _cleanup_free_
char *comm
= NULL
;
5511 (void) get_process_comm(pid
, &comm
);
5513 if (ignore_leftover_process(comm
))
5516 /* During start we print a warning */
5518 log_unit_warning(userdata
,
5519 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5520 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5526 int unit_log_leftover_process_stop(pid_t pid
, int sig
, void *userdata
) {
5527 _cleanup_free_
char *comm
= NULL
;
5529 (void) get_process_comm(pid
, &comm
);
5531 if (ignore_leftover_process(comm
))
5534 /* During stop we only print an informational message */
5536 log_unit_info(userdata
,
5537 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
5543 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
5546 (void) unit_pick_cgroup_path(u
);
5548 if (!u
->cgroup_path
)
5551 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_func
, u
);
5554 bool unit_needs_console(Unit
*u
) {
5556 UnitActiveState state
;
5560 state
= unit_active_state(u
);
5562 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5565 if (UNIT_VTABLE(u
)->needs_console
)
5566 return UNIT_VTABLE(u
)->needs_console(u
);
5568 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5569 ec
= unit_get_exec_context(u
);
5573 return exec_context_may_touch_console(ec
);
5576 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5581 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5582 * and not a kernel thread either */
5584 /* First, a simple range check */
5585 if (!pid_is_valid(pid
))
5586 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5588 /* Some extra safety check */
5589 if (pid
== 1 || pid
== getpid_cached())
5590 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5592 /* Don't even begin to bother with kernel threads */
5593 r
= is_kernel_thread(pid
);
5595 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5597 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5599 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5604 void unit_log_success(Unit
*u
) {
5607 /* Let's show message "Deactivated successfully" in debug mode (when manager is user) rather than in info mode.
5608 * This message has low information value for regular users and it might be a bit overwhelming on a system with
5609 * a lot of devices. */
5611 MANAGER_IS_USER(u
->manager
) ? LOG_DEBUG
: LOG_INFO
,
5612 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5613 LOG_UNIT_INVOCATION_ID(u
),
5614 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
5617 void unit_log_failure(Unit
*u
, const char *result
) {
5621 log_unit_struct(u
, LOG_WARNING
,
5622 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5623 LOG_UNIT_INVOCATION_ID(u
),
5624 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5625 "UNIT_RESULT=%s", result
);
5628 void unit_log_skip(Unit
*u
, const char *result
) {
5632 log_unit_struct(u
, LOG_INFO
,
5633 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5634 LOG_UNIT_INVOCATION_ID(u
),
5635 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5636 "UNIT_RESULT=%s", result
);
5639 void unit_log_process_exit(
5642 const char *command
,
5652 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5653 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5654 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5658 else if (code
== CLD_EXITED
)
5661 level
= LOG_WARNING
;
5663 log_unit_struct(u
, level
,
5664 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5665 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s%s",
5667 sigchld_code_to_string(code
), status
,
5668 strna(code
== CLD_EXITED
5669 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5670 : signal_to_string(status
)),
5671 success
? " (success)" : ""),
5672 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5673 "EXIT_STATUS=%i", status
,
5674 "COMMAND=%s", strna(command
),
5675 LOG_UNIT_INVOCATION_ID(u
));
5678 int unit_exit_status(Unit
*u
) {
5681 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5682 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5683 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5684 * service process has exited abnormally (signal/coredump). */
5686 if (!UNIT_VTABLE(u
)->exit_status
)
5689 return UNIT_VTABLE(u
)->exit_status(u
);
5692 int unit_failure_action_exit_status(Unit
*u
) {
5697 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5699 if (u
->failure_action_exit_status
>= 0)
5700 return u
->failure_action_exit_status
;
5702 r
= unit_exit_status(u
);
5703 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5709 int unit_success_action_exit_status(Unit
*u
) {
5714 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5716 if (u
->success_action_exit_status
>= 0)
5717 return u
->success_action_exit_status
;
5719 r
= unit_exit_status(u
);
5720 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5726 int unit_test_trigger_loaded(Unit
*u
) {
5729 /* Tests whether the unit to trigger is loaded */
5731 trigger
= UNIT_TRIGGER(u
);
5733 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5734 "Refusing to start, no unit to trigger.");
5735 if (trigger
->load_state
!= UNIT_LOADED
)
5736 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5737 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
5742 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
5746 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
||
5747 (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
&& !unit_will_restart(u
)))
5748 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
5750 exec_context_destroy_credentials(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], u
->id
);
5753 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
5754 UnitActiveState state
;
5758 /* Special return values:
5760 * -EOPNOTSUPP → cleaning not supported for this unit type
5761 * -EUNATCH → cleaning not defined for this resource type
5762 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
5763 * a job queued or similar
5766 if (!UNIT_VTABLE(u
)->clean
)
5772 if (u
->load_state
!= UNIT_LOADED
)
5778 state
= unit_active_state(u
);
5779 if (!IN_SET(state
, UNIT_INACTIVE
))
5782 return UNIT_VTABLE(u
)->clean(u
, mask
);
5785 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
5788 if (!UNIT_VTABLE(u
)->clean
||
5789 u
->load_state
!= UNIT_LOADED
) {
5794 /* When the clean() method is set, can_clean() really should be set too */
5795 assert(UNIT_VTABLE(u
)->can_clean
);
5797 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
5800 bool unit_can_freeze(Unit
*u
) {
5803 if (UNIT_VTABLE(u
)->can_freeze
)
5804 return UNIT_VTABLE(u
)->can_freeze(u
);
5806 return UNIT_VTABLE(u
)->freeze
;
5809 void unit_frozen(Unit
*u
) {
5812 u
->freezer_state
= FREEZER_FROZEN
;
5814 bus_unit_send_pending_freezer_message(u
);
5817 void unit_thawed(Unit
*u
) {
5820 u
->freezer_state
= FREEZER_RUNNING
;
5822 bus_unit_send_pending_freezer_message(u
);
5825 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
5827 int (*method
)(Unit
*);
5831 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
5833 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
5834 if (!method
|| !cg_freezer_supported())
5840 if (u
->load_state
!= UNIT_LOADED
)
5843 s
= unit_active_state(u
);
5844 if (s
!= UNIT_ACTIVE
)
5847 if (IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
))
5854 assert(IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
));
5859 int unit_freeze(Unit
*u
) {
5860 return unit_freezer_action(u
, FREEZER_FREEZE
);
5863 int unit_thaw(Unit
*u
) {
5864 return unit_freezer_action(u
, FREEZER_THAW
);
5867 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
5868 int unit_freeze_vtable_common(Unit
*u
) {
5869 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
5872 int unit_thaw_vtable_common(Unit
*u
) {
5873 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
5876 Condition
*unit_find_failed_condition(Unit
*u
) {
5877 Condition
*failed_trigger
= NULL
;
5878 bool has_succeeded_trigger
= false;
5880 if (u
->condition_result
)
5883 LIST_FOREACH(conditions
, c
, u
->conditions
)
5885 if (c
->result
== CONDITION_SUCCEEDED
)
5886 has_succeeded_trigger
= true;
5887 else if (!failed_trigger
)
5889 } else if (c
->result
!= CONDITION_SUCCEEDED
)
5892 return failed_trigger
&& !has_succeeded_trigger
? failed_trigger
: NULL
;
5895 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5896 [COLLECT_INACTIVE
] = "inactive",
5897 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5900 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);
5902 Unit
* unit_has_dependency(const Unit
*u
, UnitDependencyAtom atom
, Unit
*other
) {
5907 /* Checks if the unit has a dependency on 'other' with the specified dependency atom. If 'other' is
5908 * NULL checks if the unit has *any* dependency of that atom. Returns 'other' if found (or if 'other'
5909 * is NULL the first entry found), or NULL if not found. */
5911 UNIT_FOREACH_DEPENDENCY(i
, u
, atom
)
5912 if (!other
|| other
== i
)
5918 int unit_get_dependency_array(const Unit
*u
, UnitDependencyAtom atom
, Unit
***ret_array
) {
5919 _cleanup_free_ Unit
**array
= NULL
;
5926 /* Gets a list of units matching a specific atom as array. This is useful when iterating through
5927 * dependencies while modifying them: the array is an "atomic snapshot" of sorts, that can be read
5928 * while the dependency table is continuously updated. */
5930 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
5931 if (!GREEDY_REALLOC(array
, n
+ 1))
5937 *ret_array
= TAKE_PTR(array
);
5939 assert(n
<= INT_MAX
);
5943 const ActivationDetailsVTable
* const activation_details_vtable
[_UNIT_TYPE_MAX
] = {
5944 [UNIT_PATH
] = &activation_details_path_vtable
,
5945 [UNIT_TIMER
] = &activation_details_timer_vtable
,
5948 ActivationDetails
*activation_details_new(Unit
*trigger_unit
) {
5949 _cleanup_free_ ActivationDetails
*details
= NULL
;
5951 assert(trigger_unit
);
5952 assert(trigger_unit
->type
!= _UNIT_TYPE_INVALID
);
5953 assert(trigger_unit
->id
);
5955 details
= malloc0(activation_details_vtable
[trigger_unit
->type
]->object_size
);
5959 *details
= (ActivationDetails
) {
5961 .trigger_unit_type
= trigger_unit
->type
,
5964 details
->trigger_unit_name
= strdup(trigger_unit
->id
);
5965 if (!details
->trigger_unit_name
)
5968 if (ACTIVATION_DETAILS_VTABLE(details
)->init
)
5969 ACTIVATION_DETAILS_VTABLE(details
)->init(details
, trigger_unit
);
5971 return TAKE_PTR(details
);
5974 static ActivationDetails
*activation_details_free(ActivationDetails
*details
) {
5978 if (ACTIVATION_DETAILS_VTABLE(details
)->done
)
5979 ACTIVATION_DETAILS_VTABLE(details
)->done(details
);
5981 free(details
->trigger_unit_name
);
5983 return mfree(details
);
5986 void activation_details_serialize(ActivationDetails
*details
, FILE *f
) {
5987 if (!details
|| details
->trigger_unit_type
== _UNIT_TYPE_INVALID
)
5990 (void) serialize_item(f
, "activation-details-unit-type", unit_type_to_string(details
->trigger_unit_type
));
5991 if (details
->trigger_unit_name
)
5992 (void) serialize_item(f
, "activation-details-unit-name", details
->trigger_unit_name
);
5993 if (ACTIVATION_DETAILS_VTABLE(details
)->serialize
)
5994 ACTIVATION_DETAILS_VTABLE(details
)->serialize(details
, f
);
5997 int activation_details_deserialize(const char *key
, const char *value
, ActivationDetails
**details
) {
6005 if (!streq(key
, "activation-details-unit-type"))
6008 t
= unit_type_from_string(value
);
6009 if (t
== _UNIT_TYPE_INVALID
)
6012 *details
= malloc0(activation_details_vtable
[t
]->object_size
);
6016 **details
= (ActivationDetails
) {
6018 .trigger_unit_type
= t
,
6024 if (streq(key
, "activation-details-unit-name")) {
6025 (*details
)->trigger_unit_name
= strdup(value
);
6026 if (!(*details
)->trigger_unit_name
)
6032 if (ACTIVATION_DETAILS_VTABLE(*details
)->deserialize
)
6033 return ACTIVATION_DETAILS_VTABLE(*details
)->deserialize(key
, value
, details
);
6038 int activation_details_append_env(ActivationDetails
*details
, char ***strv
) {
6046 if (!isempty(details
->trigger_unit_name
)) {
6047 char *s
= strjoin("TRIGGER_UNIT=", details
->trigger_unit_name
);
6051 r
= strv_consume(strv
, TAKE_PTR(s
));
6056 if (ACTIVATION_DETAILS_VTABLE(details
)->append_env
) {
6057 r
= ACTIVATION_DETAILS_VTABLE(details
)->append_env(details
, strv
);
6062 return r
+ !isempty(details
->trigger_unit_name
); /* Return the number of variables added to the env block */
6065 int activation_details_append_pair(ActivationDetails
*details
, char ***strv
) {
6073 if (!isempty(details
->trigger_unit_name
)) {
6074 r
= strv_extend(strv
, "trigger_unit");
6078 r
= strv_extend(strv
, details
->trigger_unit_name
);
6083 if (ACTIVATION_DETAILS_VTABLE(details
)->append_env
) {
6084 r
= ACTIVATION_DETAILS_VTABLE(details
)->append_pair(details
, strv
);
6089 return r
+ !isempty(details
->trigger_unit_name
); /* Return the number of pairs added to the strv */
6092 DEFINE_TRIVIAL_REF_UNREF_FUNC(ActivationDetails
, activation_details
, activation_details_free
);