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 "core-varlink.h"
21 #include "dbus-unit.h"
27 #include "fileio-label.h"
29 #include "format-util.h"
30 #include "id128-util.h"
34 #include "load-dropin.h"
35 #include "load-fragment.h"
38 #include "missing_audit.h"
40 #include "path-util.h"
41 #include "process-util.h"
44 #include "signal-util.h"
45 #include "sparse-endian.h"
47 #include "specifier.h"
48 #include "stat-util.h"
49 #include "stdio-util.h"
50 #include "string-table.h"
51 #include "string-util.h"
53 #include "terminal-util.h"
54 #include "tmpfile-util.h"
55 #include "umask-util.h"
56 #include "unit-name.h"
58 #include "user-util.h"
64 /* Thresholds for logging at INFO level about resource consumption */
65 #define MENTIONWORTHY_CPU_NSEC (1 * NSEC_PER_SEC)
66 #define MENTIONWORTHY_IO_BYTES (1024 * 1024ULL)
67 #define MENTIONWORTHY_IP_BYTES (0ULL)
69 /* Thresholds for logging at INFO level about resource consumption */
70 #define NOTICEWORTHY_CPU_NSEC (10*60 * NSEC_PER_SEC) /* 10 minutes */
71 #define NOTICEWORTHY_IO_BYTES (10 * 1024 * 1024ULL) /* 10 MB */
72 #define NOTICEWORTHY_IP_BYTES (128 * 1024 * 1024ULL) /* 128 MB */
74 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
75 [UNIT_SERVICE
] = &service_vtable
,
76 [UNIT_SOCKET
] = &socket_vtable
,
77 [UNIT_TARGET
] = &target_vtable
,
78 [UNIT_DEVICE
] = &device_vtable
,
79 [UNIT_MOUNT
] = &mount_vtable
,
80 [UNIT_AUTOMOUNT
] = &automount_vtable
,
81 [UNIT_SWAP
] = &swap_vtable
,
82 [UNIT_TIMER
] = &timer_vtable
,
83 [UNIT_PATH
] = &path_vtable
,
84 [UNIT_SLICE
] = &slice_vtable
,
85 [UNIT_SCOPE
] = &scope_vtable
,
88 Unit
* unit_new(Manager
*m
, size_t size
) {
92 assert(size
>= sizeof(Unit
));
99 u
->type
= _UNIT_TYPE_INVALID
;
100 u
->default_dependencies
= true;
101 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
102 u
->unit_file_preset
= -1;
103 u
->on_failure_job_mode
= JOB_REPLACE
;
104 u
->on_success_job_mode
= JOB_FAIL
;
105 u
->cgroup_control_inotify_wd
= -1;
106 u
->cgroup_memory_inotify_wd
= -1;
107 u
->job_timeout
= USEC_INFINITY
;
108 u
->job_running_timeout
= USEC_INFINITY
;
109 u
->ref_uid
= UID_INVALID
;
110 u
->ref_gid
= GID_INVALID
;
111 u
->cpu_usage_last
= NSEC_INFINITY
;
112 u
->cgroup_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
113 u
->failure_action_exit_status
= u
->success_action_exit_status
= -1;
115 u
->ip_accounting_ingress_map_fd
= -1;
116 u
->ip_accounting_egress_map_fd
= -1;
117 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++)
118 u
->io_accounting_last
[i
] = UINT64_MAX
;
120 u
->ipv4_allow_map_fd
= -1;
121 u
->ipv6_allow_map_fd
= -1;
122 u
->ipv4_deny_map_fd
= -1;
123 u
->ipv6_deny_map_fd
= -1;
125 u
->last_section_private
= -1;
127 u
->start_ratelimit
= (RateLimit
) { m
->default_start_limit_interval
, m
->default_start_limit_burst
};
128 u
->auto_start_stop_ratelimit
= (RateLimit
) { 10 * USEC_PER_SEC
, 16 };
133 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
134 _cleanup_(unit_freep
) Unit
*u
= NULL
;
137 u
= unit_new(m
, size
);
141 r
= unit_add_name(u
, name
);
150 bool unit_has_name(const Unit
*u
, const char *name
) {
154 return streq_ptr(name
, u
->id
) ||
155 set_contains(u
->aliases
, name
);
158 static void unit_init(Unit
*u
) {
165 assert(u
->type
>= 0);
167 cc
= unit_get_cgroup_context(u
);
169 cgroup_context_init(cc
);
171 /* Copy in the manager defaults into the cgroup
172 * context, _before_ the rest of the settings have
173 * been initialized */
175 cc
->cpu_accounting
= u
->manager
->default_cpu_accounting
;
176 cc
->io_accounting
= u
->manager
->default_io_accounting
;
177 cc
->blockio_accounting
= u
->manager
->default_blockio_accounting
;
178 cc
->memory_accounting
= u
->manager
->default_memory_accounting
;
179 cc
->tasks_accounting
= u
->manager
->default_tasks_accounting
;
180 cc
->ip_accounting
= u
->manager
->default_ip_accounting
;
182 if (u
->type
!= UNIT_SLICE
)
183 cc
->tasks_max
= u
->manager
->default_tasks_max
;
186 ec
= unit_get_exec_context(u
);
188 exec_context_init(ec
);
190 if (MANAGER_IS_SYSTEM(u
->manager
))
191 ec
->keyring_mode
= EXEC_KEYRING_SHARED
;
193 ec
->keyring_mode
= EXEC_KEYRING_INHERIT
;
195 /* User manager might have its umask redefined by PAM or UMask=. In this
196 * case let the units it manages inherit this value by default. They can
197 * still tune this value through their own unit file */
198 (void) get_process_umask(getpid_cached(), &ec
->umask
);
202 kc
= unit_get_kill_context(u
);
204 kill_context_init(kc
);
206 if (UNIT_VTABLE(u
)->init
)
207 UNIT_VTABLE(u
)->init(u
);
210 static int unit_add_alias(Unit
*u
, char *donated_name
) {
213 /* Make sure that u->names is allocated. We may leave u->names
214 * empty if we fail later, but this is not a problem. */
215 r
= set_ensure_put(&u
->aliases
, &string_hash_ops
, donated_name
);
223 int unit_add_name(Unit
*u
, const char *text
) {
224 _cleanup_free_
char *name
= NULL
, *instance
= NULL
;
231 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
233 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
234 "instance is not set when adding name '%s': %m", text
);
236 r
= unit_name_replace_instance(text
, u
->instance
, &name
);
238 return log_unit_debug_errno(u
, r
,
239 "failed to build instance name from '%s': %m", text
);
246 if (unit_has_name(u
, name
))
249 if (hashmap_contains(u
->manager
->units
, name
))
250 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
251 "unit already exist when adding name '%s': %m", name
);
253 if (!unit_name_is_valid(name
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
254 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
255 "name '%s' is invalid: %m", name
);
257 t
= unit_name_to_type(name
);
259 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
260 "failed to derive unit type from name '%s': %m", name
);
262 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
263 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
264 "unit type is illegal: u->type(%d) and t(%d) for name '%s': %m",
267 r
= unit_name_to_instance(name
, &instance
);
269 return log_unit_debug_errno(u
, r
, "failed to extract instance from name '%s': %m", name
);
271 if (instance
&& !unit_type_may_template(t
))
272 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
), "templates are not allowed for name '%s': %m", name
);
274 /* Ensure that this unit either has no instance, or that the instance matches. */
275 if (u
->type
!= _UNIT_TYPE_INVALID
&& !streq_ptr(u
->instance
, instance
))
276 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
277 "cannot add name %s, the instances don't match (\"%s\" != \"%s\").",
278 name
, instance
, u
->instance
);
280 if (u
->id
&& !unit_type_may_alias(t
))
281 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
282 "cannot add name %s, aliases are not allowed for %s units.",
283 name
, unit_type_to_string(t
));
285 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
286 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(E2BIG
), "cannot add name, manager has too many units: %m");
288 /* Add name to the global hashmap first, because that's easier to undo */
289 r
= hashmap_put(u
->manager
->units
, name
, u
);
291 return log_unit_debug_errno(u
, r
, "add unit to hashmap failed for name '%s': %m", text
);
294 r
= unit_add_alias(u
, name
); /* unit_add_alias() takes ownership of the name on success */
296 hashmap_remove(u
->manager
->units
, name
);
302 /* A new name, we don't need the set yet. */
303 assert(u
->type
== _UNIT_TYPE_INVALID
);
304 assert(!u
->instance
);
307 u
->id
= TAKE_PTR(name
);
308 u
->instance
= TAKE_PTR(instance
);
310 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
314 unit_add_to_dbus_queue(u
);
318 int unit_choose_id(Unit
*u
, const char *name
) {
319 _cleanup_free_
char *t
= NULL
;
326 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
330 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
337 if (streq_ptr(u
->id
, name
))
338 return 0; /* Nothing to do. */
340 /* Selects one of the aliases of this unit as the id */
341 s
= set_get(u
->aliases
, (char*) name
);
346 r
= set_remove_and_put(u
->aliases
, name
, u
->id
);
350 assert_se(set_remove(u
->aliases
, name
)); /* see set_get() above… */
352 u
->id
= s
; /* Old u->id is now stored in the set, and s is not stored anywhere */
353 unit_add_to_dbus_queue(u
);
358 int unit_set_description(Unit
*u
, const char *description
) {
363 r
= free_and_strdup(&u
->description
, empty_to_null(description
));
367 unit_add_to_dbus_queue(u
);
372 bool unit_may_gc(Unit
*u
) {
373 UnitActiveState state
;
378 /* Checks whether the unit is ready to be unloaded for garbage collection.
379 * Returns true when the unit may be collected, and false if there's some
380 * reason to keep it loaded.
382 * References from other units are *not* checked here. Instead, this is done
383 * in unit_gc_sweep(), but using markers to properly collect dependency loops.
392 state
= unit_active_state(u
);
394 /* If the unit is inactive and failed and no job is queued for it, then release its runtime resources */
395 if (UNIT_IS_INACTIVE_OR_FAILED(state
) &&
396 UNIT_VTABLE(u
)->release_resources
)
397 UNIT_VTABLE(u
)->release_resources(u
);
402 if (sd_bus_track_count(u
->bus_track
) > 0)
405 /* But we keep the unit object around for longer when it is referenced or configured to not be gc'ed */
406 switch (u
->collect_mode
) {
408 case COLLECT_INACTIVE
:
409 if (state
!= UNIT_INACTIVE
)
414 case COLLECT_INACTIVE_OR_FAILED
:
415 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
421 assert_not_reached("Unknown garbage collection mode");
424 if (u
->cgroup_path
) {
425 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
426 * around. Units with active processes should never be collected. */
428 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
430 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", u
->cgroup_path
);
435 if (UNIT_VTABLE(u
)->may_gc
&& !UNIT_VTABLE(u
)->may_gc(u
))
441 void unit_add_to_load_queue(Unit
*u
) {
443 assert(u
->type
!= _UNIT_TYPE_INVALID
);
445 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
448 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
449 u
->in_load_queue
= true;
452 void unit_add_to_cleanup_queue(Unit
*u
) {
455 if (u
->in_cleanup_queue
)
458 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
459 u
->in_cleanup_queue
= true;
462 void unit_add_to_gc_queue(Unit
*u
) {
465 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
471 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
472 u
->in_gc_queue
= true;
475 void unit_add_to_dbus_queue(Unit
*u
) {
477 assert(u
->type
!= _UNIT_TYPE_INVALID
);
479 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
482 /* Shortcut things if nobody cares */
483 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
484 sd_bus_track_count(u
->bus_track
) <= 0 &&
485 set_isempty(u
->manager
->private_buses
)) {
486 u
->sent_dbus_new_signal
= true;
490 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
491 u
->in_dbus_queue
= true;
494 void unit_submit_to_stop_when_unneeded_queue(Unit
*u
) {
497 if (u
->in_stop_when_unneeded_queue
)
500 if (!u
->stop_when_unneeded
)
503 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
506 LIST_PREPEND(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
507 u
->in_stop_when_unneeded_queue
= true;
510 void unit_submit_to_start_when_upheld_queue(Unit
*u
) {
513 if (u
->in_start_when_upheld_queue
)
516 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)))
519 if (!unit_has_dependency(u
, UNIT_ATOM_START_STEADILY
, NULL
))
522 LIST_PREPEND(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
523 u
->in_start_when_upheld_queue
= true;
526 void unit_submit_to_stop_when_bound_queue(Unit
*u
) {
529 if (u
->in_stop_when_bound_queue
)
532 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
535 if (!unit_has_dependency(u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
, NULL
))
538 LIST_PREPEND(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
539 u
->in_stop_when_bound_queue
= true;
542 static void unit_clear_dependencies(Unit
*u
) {
545 /* Removes all dependencies configured on u and their reverse dependencies. */
547 for (Hashmap
*deps
; (deps
= hashmap_steal_first(u
->dependencies
));) {
549 for (Unit
*other
; (other
= hashmap_steal_first_key(deps
));) {
552 HASHMAP_FOREACH(other_deps
, other
->dependencies
)
553 hashmap_remove(other_deps
, u
);
555 unit_add_to_gc_queue(other
);
561 u
->dependencies
= hashmap_free(u
->dependencies
);
564 static void unit_remove_transient(Unit
*u
) {
572 if (u
->fragment_path
)
573 (void) unlink(u
->fragment_path
);
575 STRV_FOREACH(i
, u
->dropin_paths
) {
576 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
578 p
= dirname_malloc(*i
); /* Get the drop-in directory from the drop-in file */
582 pp
= dirname_malloc(p
); /* Get the config directory from the drop-in directory */
586 /* Only drop transient drop-ins */
587 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
595 static void unit_free_requires_mounts_for(Unit
*u
) {
599 _cleanup_free_
char *path
= NULL
;
601 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
605 char s
[strlen(path
) + 1];
607 PATH_FOREACH_PREFIX_MORE(s
, path
) {
611 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
615 (void) set_remove(x
, u
);
617 if (set_isempty(x
)) {
618 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
626 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
629 static void unit_done(Unit
*u
) {
638 if (UNIT_VTABLE(u
)->done
)
639 UNIT_VTABLE(u
)->done(u
);
641 ec
= unit_get_exec_context(u
);
643 exec_context_done(ec
);
645 cc
= unit_get_cgroup_context(u
);
647 cgroup_context_done(cc
);
650 Unit
* unit_free(Unit
*u
) {
657 u
->transient_file
= safe_fclose(u
->transient_file
);
659 if (!MANAGER_IS_RELOADING(u
->manager
))
660 unit_remove_transient(u
);
662 bus_unit_send_removed_signal(u
);
666 unit_dequeue_rewatch_pids(u
);
668 sd_bus_slot_unref(u
->match_bus_slot
);
669 sd_bus_track_unref(u
->bus_track
);
670 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
671 u
->pending_freezer_message
= sd_bus_message_unref(u
->pending_freezer_message
);
673 unit_free_requires_mounts_for(u
);
675 SET_FOREACH(t
, u
->aliases
)
676 hashmap_remove_value(u
->manager
->units
, t
, u
);
678 hashmap_remove_value(u
->manager
->units
, u
->id
, u
);
680 if (!sd_id128_is_null(u
->invocation_id
))
681 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
695 /* A unit is being dropped from the tree, make sure our family is realized properly. Do this after we
696 * detach the unit from slice tree in order to eliminate its effect on controller masks. */
697 slice
= UNIT_GET_SLICE(u
);
698 unit_clear_dependencies(u
);
700 unit_add_family_to_cgroup_realize_queue(slice
);
703 manager_unref_console(u
->manager
);
706 fdset_free(u
->initial_socket_bind_link_fds
);
708 bpf_link_free(u
->ipv4_socket_bind_link
);
709 bpf_link_free(u
->ipv6_socket_bind_link
);
712 unit_release_cgroup(u
);
714 if (!MANAGER_IS_RELOADING(u
->manager
))
715 unit_unlink_state_files(u
);
717 unit_unref_uid_gid(u
, false);
719 (void) manager_update_failed_units(u
->manager
, u
, false);
720 set_remove(u
->manager
->startup_units
, u
);
722 unit_unwatch_all_pids(u
);
724 while (u
->refs_by_target
)
725 unit_ref_unset(u
->refs_by_target
);
727 if (u
->type
!= _UNIT_TYPE_INVALID
)
728 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
730 if (u
->in_load_queue
)
731 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
733 if (u
->in_dbus_queue
)
734 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
737 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
739 if (u
->in_cgroup_realize_queue
)
740 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
742 if (u
->in_cgroup_empty_queue
)
743 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
745 if (u
->in_cleanup_queue
)
746 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
748 if (u
->in_target_deps_queue
)
749 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
751 if (u
->in_stop_when_unneeded_queue
)
752 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
754 if (u
->in_start_when_upheld_queue
)
755 LIST_REMOVE(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
757 if (u
->in_stop_when_bound_queue
)
758 LIST_REMOVE(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
760 bpf_firewall_close(u
);
762 hashmap_free(u
->bpf_foreign_by_key
);
764 bpf_program_unref(u
->bpf_device_control_installed
);
766 condition_free_list(u
->conditions
);
767 condition_free_list(u
->asserts
);
769 free(u
->description
);
770 strv_free(u
->documentation
);
771 free(u
->fragment_path
);
772 free(u
->source_path
);
773 strv_free(u
->dropin_paths
);
776 free(u
->job_timeout_reboot_arg
);
779 set_free_free(u
->aliases
);
785 FreezerState
unit_freezer_state(Unit
*u
) {
788 return u
->freezer_state
;
791 int unit_freezer_state_kernel(Unit
*u
, FreezerState
*ret
) {
792 char *values
[1] = {};
797 r
= cg_get_keyed_attribute(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events",
798 STRV_MAKE("frozen"), values
);
802 r
= _FREEZER_STATE_INVALID
;
805 if (streq(values
[0], "0"))
807 else if (streq(values
[0], "1"))
817 UnitActiveState
unit_active_state(Unit
*u
) {
820 if (u
->load_state
== UNIT_MERGED
)
821 return unit_active_state(unit_follow_merge(u
));
823 /* After a reload it might happen that a unit is not correctly
824 * loaded but still has a process around. That's why we won't
825 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
827 return UNIT_VTABLE(u
)->active_state(u
);
830 const char* unit_sub_state_to_string(Unit
*u
) {
833 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
836 static int unit_merge_names(Unit
*u
, Unit
*other
) {
843 r
= unit_add_alias(u
, other
->id
);
847 r
= set_move(u
->aliases
, other
->aliases
);
849 set_remove(u
->aliases
, other
->id
);
854 other
->aliases
= set_free_free(other
->aliases
);
856 SET_FOREACH(name
, u
->aliases
)
857 assert_se(hashmap_replace(u
->manager
->units
, name
, u
) == 0);
862 static int unit_reserve_dependencies(Unit
*u
, Unit
*other
) {
871 /* Let's reserve some space in the dependency hashmaps so that later on merging the units cannot
874 * First make some room in the per dependency type hashmaps. Using the summed size of both unit's
875 * hashmaps is an estimate that is likely too high since they probably use some of the same
876 * types. But it's never too low, and that's all we need. */
878 n_reserve
= MIN(hashmap_size(other
->dependencies
), LESS_BY((size_t) _UNIT_DEPENDENCY_MAX
, hashmap_size(u
->dependencies
)));
880 r
= hashmap_ensure_allocated(&u
->dependencies
, NULL
);
884 r
= hashmap_reserve(u
->dependencies
, n_reserve
);
889 /* Now, enlarge our per dependency type hashmaps by the number of entries in the same hashmap of the
890 * other unit's dependencies.
892 * NB: If u does not have a dependency set allocated for some dependency type, there is no need to
893 * reserve anything for. In that case other's set will be transferred as a whole to u by
894 * complete_move(). */
896 HASHMAP_FOREACH_KEY(deps
, d
, u
->dependencies
) {
899 other_deps
= hashmap_get(other
->dependencies
, d
);
901 r
= hashmap_reserve(deps
, hashmap_size(other_deps
));
909 static void unit_maybe_warn_about_dependency(
911 const char *other_id
,
912 UnitDependency dependency
) {
916 /* Only warn about some unit types */
917 if (!IN_SET(dependency
,
928 if (streq_ptr(u
->id
, other_id
))
929 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
931 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other_id
), u
->id
);
934 static int unit_per_dependency_type_hashmap_update(
937 UnitDependencyMask origin_mask
,
938 UnitDependencyMask destination_mask
) {
940 UnitDependencyInfo info
;
944 assert_cc(sizeof(void*) == sizeof(info
));
946 /* Acquire the UnitDependencyInfo entry for the Unit* we are interested in, and update it if it
947 * exists, or insert it anew if not. */
949 info
.data
= hashmap_get(per_type
, other
);
951 /* Entry already exists. Add in our mask. */
953 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
954 FLAGS_SET(destination_mask
, info
.destination_mask
))
957 info
.origin_mask
|= origin_mask
;
958 info
.destination_mask
|= destination_mask
;
960 r
= hashmap_update(per_type
, other
, info
.data
);
962 info
= (UnitDependencyInfo
) {
963 .origin_mask
= origin_mask
,
964 .destination_mask
= destination_mask
,
967 r
= hashmap_put(per_type
, other
, info
.data
);
976 static int unit_add_dependency_hashmap(
977 Hashmap
**dependencies
,
980 UnitDependencyMask origin_mask
,
981 UnitDependencyMask destination_mask
) {
986 assert(dependencies
);
988 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
989 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
990 assert(origin_mask
> 0 || destination_mask
> 0);
992 /* Ensure the top-level dependency hashmap exists that maps UnitDependency → Hashmap(Unit* →
993 * UnitDependencyInfo) */
994 r
= hashmap_ensure_allocated(dependencies
, NULL
);
998 /* Acquire the inner hashmap, that maps Unit* → UnitDependencyInfo, for the specified dependency
999 * type, and if it's missing allocate it and insert it. */
1000 per_type
= hashmap_get(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
));
1002 per_type
= hashmap_new(NULL
);
1006 r
= hashmap_put(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
), per_type
);
1008 hashmap_free(per_type
);
1013 return unit_per_dependency_type_hashmap_update(per_type
, other
, origin_mask
, destination_mask
);
1016 static void unit_merge_dependencies(
1029 _cleanup_(hashmap_freep
) Hashmap
*other_deps
= NULL
;
1030 UnitDependencyInfo di_back
;
1032 void *dt
; /* Actually of type UnitDependency, except that we don't bother casting it here,
1033 * since the hashmaps all want it as void pointer. */
1035 /* Let's focus on one dependency type at a time, that 'other' has defined. */
1036 other_deps
= hashmap_steal_first_key_and_value(other
->dependencies
, &dt
);
1040 /* Now iterate through all dependencies of this dependency type, of 'other'. We refer to the
1041 * referenced units as 'back'. */
1042 HASHMAP_FOREACH_KEY(di_back
.data
, back
, other_deps
) {
1047 /* This is a dependency pointing back to the unit we want to merge with?
1048 * Suppress it (but warn) */
1049 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1053 /* Now iterate through all deps of 'back', and fix the ones pointing to 'other' to
1054 * point to 'u' instead. */
1055 HASHMAP_FOREACH_KEY(back_deps
, back_dt
, back
->dependencies
) {
1056 UnitDependencyInfo di_move
;
1058 di_move
.data
= hashmap_remove(back_deps
, other
);
1062 assert_se(unit_per_dependency_type_hashmap_update(
1065 di_move
.origin_mask
,
1066 di_move
.destination_mask
) >= 0);
1070 /* Now all references towards 'other' of the current type 'dt' are corrected to point to
1071 * 'u'. Lets's now move the deps of type 'dt' from 'other' to 'u'. First, let's try to move
1072 * them per type wholesale. */
1073 r
= hashmap_put(u
->dependencies
, dt
, other_deps
);
1077 /* The target unit already has dependencies of this type, let's then merge this individually. */
1079 assert_se(deps
= hashmap_get(u
->dependencies
, dt
));
1082 UnitDependencyInfo di_move
;
1085 di_move
.data
= hashmap_steal_first_key_and_value(other_deps
, (void**) &back
);
1089 /* Would point back to us, ignore */
1090 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1094 assert_se(unit_per_dependency_type_hashmap_update(deps
, back
, di_move
.origin_mask
, di_move
.destination_mask
) >= 0);
1098 TAKE_PTR(other_deps
);
1100 if (hashmap_remove(other_deps
, u
))
1101 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1105 other
->dependencies
= hashmap_free(other
->dependencies
);
1108 int unit_merge(Unit
*u
, Unit
*other
) {
1113 assert(u
->manager
== other
->manager
);
1114 assert(u
->type
!= _UNIT_TYPE_INVALID
);
1116 other
= unit_follow_merge(other
);
1121 if (u
->type
!= other
->type
)
1124 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
1127 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
1130 if (!streq_ptr(u
->instance
, other
->instance
))
1139 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1142 /* Make reservations to ensure merge_dependencies() won't fail. We don't rollback reservations if we
1143 * fail. We don't have a way to undo reservations. A reservation is not a leak. */
1144 r
= unit_reserve_dependencies(u
, other
);
1149 r
= unit_merge_names(u
, other
);
1153 /* Redirect all references */
1154 while (other
->refs_by_target
)
1155 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
1157 /* Merge dependencies */
1158 unit_merge_dependencies(u
, other
);
1160 other
->load_state
= UNIT_MERGED
;
1161 other
->merged_into
= u
;
1163 /* If there is still some data attached to the other node, we
1164 * don't need it anymore, and can free it. */
1165 if (other
->load_state
!= UNIT_STUB
)
1166 if (UNIT_VTABLE(other
)->done
)
1167 UNIT_VTABLE(other
)->done(other
);
1169 unit_add_to_dbus_queue(u
);
1170 unit_add_to_cleanup_queue(other
);
1175 int unit_merge_by_name(Unit
*u
, const char *name
) {
1176 _cleanup_free_
char *s
= NULL
;
1180 /* Either add name to u, or if a unit with name already exists, merge it with u.
1181 * If name is a template, do the same for name@instance, where instance is u's instance. */
1186 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
1190 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
1197 other
= manager_get_unit(u
->manager
, name
);
1199 return unit_merge(u
, other
);
1201 return unit_add_name(u
, name
);
1204 Unit
* unit_follow_merge(Unit
*u
) {
1207 while (u
->load_state
== UNIT_MERGED
)
1208 assert_se(u
= u
->merged_into
);
1213 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
1219 if (c
->working_directory
&& !c
->working_directory_missing_ok
) {
1220 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
1225 if (c
->root_directory
) {
1226 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
1231 if (c
->root_image
) {
1232 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
1237 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
1238 if (!u
->manager
->prefix
[dt
])
1242 STRV_FOREACH(dp
, c
->directories
[dt
].paths
) {
1243 _cleanup_free_
char *p
= NULL
;
1245 p
= path_join(u
->manager
->prefix
[dt
], *dp
);
1249 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1255 if (!MANAGER_IS_SYSTEM(u
->manager
))
1258 /* For the following three directory types we need write access, and /var/ is possibly on the root
1259 * fs. Hence order after systemd-remount-fs.service, to ensure things are writable. */
1260 if (!strv_isempty(c
->directories
[EXEC_DIRECTORY_STATE
].paths
) ||
1261 !strv_isempty(c
->directories
[EXEC_DIRECTORY_CACHE
].paths
) ||
1262 !strv_isempty(c
->directories
[EXEC_DIRECTORY_LOGS
].paths
)) {
1263 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_REMOUNT_FS_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1268 if (c
->private_tmp
) {
1270 /* FIXME: for now we make a special case for /tmp and add a weak dependency on
1271 * tmp.mount so /tmp being masked is supported. However there's no reason to treat
1272 * /tmp specifically and masking other mount units should be handled more
1273 * gracefully too, see PR#16894. */
1274 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "tmp.mount", true, UNIT_DEPENDENCY_FILE
);
1278 r
= unit_require_mounts_for(u
, "/var/tmp", UNIT_DEPENDENCY_FILE
);
1282 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1287 if (c
->root_image
) {
1288 /* We need to wait for /dev/loopX to appear when doing RootImage=, hence let's add an
1289 * implicit dependency on udev */
1291 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_UDEVD_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1296 if (!IN_SET(c
->std_output
,
1297 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1298 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1299 !IN_SET(c
->std_error
,
1300 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1301 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1305 /* If syslog or kernel logging is requested (or log namespacing is), make sure our own logging daemon
1308 if (c
->log_namespace
) {
1309 _cleanup_free_
char *socket_unit
= NULL
, *varlink_socket_unit
= NULL
;
1311 r
= unit_name_build_from_type("systemd-journald", c
->log_namespace
, UNIT_SOCKET
, &socket_unit
);
1315 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1319 r
= unit_name_build_from_type("systemd-journald-varlink", c
->log_namespace
, UNIT_SOCKET
, &varlink_socket_unit
);
1323 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, varlink_socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1327 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1334 const char *unit_description(Unit
*u
) {
1338 return u
->description
;
1340 return strna(u
->id
);
1343 const char *unit_status_string(Unit
*u
) {
1346 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
&& u
->id
)
1349 return unit_description(u
);
1352 /* Common implementation for multiple backends */
1353 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1358 /* Load a .{service,socket,...} file */
1359 r
= unit_load_fragment(u
);
1363 if (u
->load_state
== UNIT_STUB
) {
1364 if (fragment_required
)
1367 u
->load_state
= UNIT_LOADED
;
1370 /* Load drop-in directory data. If u is an alias, we might be reloading the
1371 * target unit needlessly. But we cannot be sure which drops-ins have already
1372 * been loaded and which not, at least without doing complicated book-keeping,
1373 * so let's always reread all drop-ins. */
1374 r
= unit_load_dropin(unit_follow_merge(u
));
1378 if (u
->source_path
) {
1381 if (stat(u
->source_path
, &st
) >= 0)
1382 u
->source_mtime
= timespec_load(&st
.st_mtim
);
1384 u
->source_mtime
= 0;
1390 void unit_add_to_target_deps_queue(Unit
*u
) {
1391 Manager
*m
= u
->manager
;
1395 if (u
->in_target_deps_queue
)
1398 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1399 u
->in_target_deps_queue
= true;
1402 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1406 if (target
->type
!= UNIT_TARGET
)
1409 /* Only add the dependency if both units are loaded, so that
1410 * that loop check below is reliable */
1411 if (u
->load_state
!= UNIT_LOADED
||
1412 target
->load_state
!= UNIT_LOADED
)
1415 /* If either side wants no automatic dependencies, then let's
1417 if (!u
->default_dependencies
||
1418 !target
->default_dependencies
)
1421 /* Don't create loops */
1422 if (unit_has_dependency(target
, UNIT_ATOM_BEFORE
, u
))
1425 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1428 static int unit_add_slice_dependencies(Unit
*u
) {
1432 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1435 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1436 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1438 UnitDependencyMask mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1440 slice
= UNIT_GET_SLICE(u
);
1442 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, slice
, true, mask
);
1444 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1447 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1450 static int unit_add_mount_dependencies(Unit
*u
) {
1451 UnitDependencyInfo di
;
1457 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
) {
1458 char prefix
[strlen(path
) + 1];
1460 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1461 _cleanup_free_
char *p
= NULL
;
1464 r
= unit_name_from_path(prefix
, ".mount", &p
);
1465 if (IN_SET(r
, -EINVAL
, -ENAMETOOLONG
))
1466 continue; /* If the path cannot be converted to a mount unit name, then it's
1467 * not manageable as a unit by systemd, and hence we don't need a
1468 * dependency on it. Let's thus silently ignore the issue. */
1472 m
= manager_get_unit(u
->manager
, p
);
1474 /* Make sure to load the mount unit if it exists. If so the dependencies on
1475 * this unit will be added later during the loading of the mount unit. */
1476 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1482 if (m
->load_state
!= UNIT_LOADED
)
1485 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1489 if (m
->fragment_path
) {
1490 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1500 static int unit_add_oomd_dependencies(Unit
*u
) {
1507 if (!u
->default_dependencies
)
1510 c
= unit_get_cgroup_context(u
);
1514 wants_oomd
= (c
->moom_swap
== MANAGED_OOM_KILL
|| c
->moom_mem_pressure
== MANAGED_OOM_KILL
);
1518 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "systemd-oomd.service", true, UNIT_DEPENDENCY_FILE
);
1525 static int unit_add_startup_units(Unit
*u
) {
1528 c
= unit_get_cgroup_context(u
);
1532 if (c
->startup_cpu_shares
== CGROUP_CPU_SHARES_INVALID
&&
1533 c
->startup_io_weight
== CGROUP_WEIGHT_INVALID
&&
1534 c
->startup_blockio_weight
== CGROUP_BLKIO_WEIGHT_INVALID
)
1537 return set_ensure_put(&u
->manager
->startup_units
, NULL
, u
);
1540 static int unit_validate_on_failure_job_mode(
1542 const char *job_mode_setting
,
1544 const char *dependency_name
,
1545 UnitDependencyAtom atom
) {
1547 Unit
*other
, *found
= NULL
;
1549 if (job_mode
!= JOB_ISOLATE
)
1552 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
1555 else if (found
!= other
)
1556 return log_unit_error_errno(
1557 u
, SYNTHETIC_ERRNO(ENOEXEC
),
1558 "More than one %s dependencies specified but %sisolate set. Refusing.",
1559 dependency_name
, job_mode_setting
);
1565 int unit_load(Unit
*u
) {
1570 if (u
->in_load_queue
) {
1571 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1572 u
->in_load_queue
= false;
1575 if (u
->type
== _UNIT_TYPE_INVALID
)
1578 if (u
->load_state
!= UNIT_STUB
)
1581 if (u
->transient_file
) {
1582 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1583 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1585 r
= fflush_and_check(u
->transient_file
);
1589 u
->transient_file
= safe_fclose(u
->transient_file
);
1590 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1593 r
= UNIT_VTABLE(u
)->load(u
);
1597 assert(u
->load_state
!= UNIT_STUB
);
1599 if (u
->load_state
== UNIT_LOADED
) {
1600 unit_add_to_target_deps_queue(u
);
1602 r
= unit_add_slice_dependencies(u
);
1606 r
= unit_add_mount_dependencies(u
);
1610 r
= unit_add_oomd_dependencies(u
);
1614 r
= unit_add_startup_units(u
);
1618 r
= unit_validate_on_failure_job_mode(u
, "OnSuccessJobMode=", u
->on_success_job_mode
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
);
1622 r
= unit_validate_on_failure_job_mode(u
, "OnFailureJobMode=", u
->on_failure_job_mode
, "OnFailure=", UNIT_ATOM_ON_FAILURE
);
1626 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1627 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1629 /* We finished loading, let's ensure our parents recalculate the members mask */
1630 unit_invalidate_cgroup_members_masks(u
);
1633 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1635 unit_add_to_dbus_queue(unit_follow_merge(u
));
1636 unit_add_to_gc_queue(u
);
1637 (void) manager_varlink_send_managed_oom_update(u
);
1642 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code
1643 * should hence return ENOEXEC to ensure units are placed in this state after loading. */
1645 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1646 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1650 /* Record the timestamp on the cache, so that if the cache gets updated between now and the next time
1651 * an attempt is made to load this unit, we know we need to check again. */
1652 if (u
->load_state
== UNIT_NOT_FOUND
)
1653 u
->fragment_not_found_timestamp_hash
= u
->manager
->unit_cache_timestamp_hash
;
1655 unit_add_to_dbus_queue(u
);
1656 unit_add_to_gc_queue(u
);
1658 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1662 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1667 if (u
&& !unit_log_level_test(u
, level
))
1668 return -ERRNO_VALUE(error
);
1670 va_start(ap
, format
);
1672 r
= log_object_internalv(level
, error
, file
, line
, func
,
1673 u
->manager
->unit_log_field
,
1675 u
->manager
->invocation_log_field
,
1676 u
->invocation_id_string
,
1679 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1685 static bool unit_test_condition(Unit
*u
) {
1686 _cleanup_strv_free_
char **env
= NULL
;
1691 dual_timestamp_get(&u
->condition_timestamp
);
1693 r
= manager_get_effective_environment(u
->manager
, &env
);
1695 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1696 u
->condition_result
= CONDITION_ERROR
;
1698 u
->condition_result
= condition_test_list(
1701 condition_type_to_string
,
1705 unit_add_to_dbus_queue(u
);
1706 return u
->condition_result
;
1709 static bool unit_test_assert(Unit
*u
) {
1710 _cleanup_strv_free_
char **env
= NULL
;
1715 dual_timestamp_get(&u
->assert_timestamp
);
1717 r
= manager_get_effective_environment(u
->manager
, &env
);
1719 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1720 u
->assert_result
= CONDITION_ERROR
;
1722 u
->assert_result
= condition_test_list(
1725 assert_type_to_string
,
1729 unit_add_to_dbus_queue(u
);
1730 return u
->assert_result
;
1733 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *unit_status_msg_format
) {
1736 d
= unit_status_string(u
);
1737 if (log_get_show_color())
1738 d
= strjoina(ANSI_HIGHLIGHT
, d
, ANSI_NORMAL
);
1740 DISABLE_WARNING_FORMAT_NONLITERAL
;
1741 manager_status_printf(u
->manager
, status_type
, status
, unit_status_msg_format
, d
);
1745 int unit_test_start_limit(Unit
*u
) {
1750 if (ratelimit_below(&u
->start_ratelimit
)) {
1751 u
->start_limit_hit
= false;
1755 log_unit_warning(u
, "Start request repeated too quickly.");
1756 u
->start_limit_hit
= true;
1758 reason
= strjoina("unit ", u
->id
, " failed");
1760 emergency_action(u
->manager
, u
->start_limit_action
,
1761 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1762 u
->reboot_arg
, -1, reason
);
1767 bool unit_shall_confirm_spawn(Unit
*u
) {
1770 if (manager_is_confirm_spawn_disabled(u
->manager
))
1773 /* For some reasons units remaining in the same process group
1774 * as PID 1 fail to acquire the console even if it's not used
1775 * by any process. So skip the confirmation question for them. */
1776 return !unit_get_exec_context(u
)->same_pgrp
;
1779 static bool unit_verify_deps(Unit
*u
) {
1784 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined
1785 * with After=. We do not check Requires= or Requisite= here as they only should have an effect on
1786 * the job processing, but do not have any effect afterwards. We don't check BindsTo= dependencies
1787 * that are not used in conjunction with After= as for them any such check would make things entirely
1790 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
1792 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
))
1795 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1796 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1804 /* Errors that aren't really errors:
1805 * -EALREADY: Unit is already started.
1806 * -ECOMM: Condition failed
1807 * -EAGAIN: An operation is already in progress. Retry later.
1809 * Errors that are real errors:
1810 * -EBADR: This unit type does not support starting.
1811 * -ECANCELED: Start limit hit, too many requests for now
1812 * -EPROTO: Assert failed
1813 * -EINVAL: Unit not loaded
1814 * -EOPNOTSUPP: Unit type not supported
1815 * -ENOLINK: The necessary dependencies are not fulfilled.
1816 * -ESTALE: This unit has been started before and can't be started a second time
1817 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1819 int unit_start(Unit
*u
) {
1820 UnitActiveState state
;
1825 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1826 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1827 * waiting is finished. */
1828 state
= unit_active_state(u
);
1829 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1831 if (state
== UNIT_MAINTENANCE
)
1834 /* Units that aren't loaded cannot be started */
1835 if (u
->load_state
!= UNIT_LOADED
)
1838 /* Refuse starting scope units more than once */
1839 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1842 /* If the conditions failed, don't do anything at all. If we already are activating this call might
1843 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1844 * recheck the condition in that case. */
1845 if (state
!= UNIT_ACTIVATING
&&
1846 !unit_test_condition(u
))
1847 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition failed. Not starting unit.");
1849 /* If the asserts failed, fail the entire job */
1850 if (state
!= UNIT_ACTIVATING
&&
1851 !unit_test_assert(u
))
1852 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1854 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1855 * condition checks, so that we rather return condition check errors (which are usually not
1856 * considered a true failure) than "not supported" errors (which are considered a failure).
1858 if (!unit_type_supported(u
->type
))
1861 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1862 * should have taken care of this already, but let's check this here again. After all, our
1863 * dependencies might not be in effect anymore, due to a reload or due to a failed condition. */
1864 if (!unit_verify_deps(u
))
1867 /* Forward to the main object, if we aren't it. */
1868 following
= unit_following(u
);
1870 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1871 return unit_start(following
);
1874 /* If it is stopped, but we cannot start it, then fail */
1875 if (!UNIT_VTABLE(u
)->start
)
1878 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1879 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1880 * waits for a holdoff timer to elapse before it will start again. */
1882 unit_add_to_dbus_queue(u
);
1883 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1885 return UNIT_VTABLE(u
)->start(u
);
1888 bool unit_can_start(Unit
*u
) {
1891 if (u
->load_state
!= UNIT_LOADED
)
1894 if (!unit_type_supported(u
->type
))
1897 /* Scope units may be started only once */
1898 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
1901 return !!UNIT_VTABLE(u
)->start
;
1904 bool unit_can_isolate(Unit
*u
) {
1907 return unit_can_start(u
) &&
1912 * -EBADR: This unit type does not support stopping.
1913 * -EALREADY: Unit is already stopped.
1914 * -EAGAIN: An operation is already in progress. Retry later.
1916 int unit_stop(Unit
*u
) {
1917 UnitActiveState state
;
1922 state
= unit_active_state(u
);
1923 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1926 following
= unit_following(u
);
1928 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1929 return unit_stop(following
);
1932 if (!UNIT_VTABLE(u
)->stop
)
1935 unit_add_to_dbus_queue(u
);
1936 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1938 return UNIT_VTABLE(u
)->stop(u
);
1941 bool unit_can_stop(Unit
*u
) {
1944 /* Note: if we return true here, it does not mean that the unit may be successfully stopped.
1945 * Extrinsic units follow external state and they may stop following external state changes
1946 * (hence we return true here), but an attempt to do this through the manager will fail. */
1948 if (!unit_type_supported(u
->type
))
1954 return !!UNIT_VTABLE(u
)->stop
;
1958 * -EBADR: This unit type does not support reloading.
1959 * -ENOEXEC: Unit is not started.
1960 * -EAGAIN: An operation is already in progress. Retry later.
1962 int unit_reload(Unit
*u
) {
1963 UnitActiveState state
;
1968 if (u
->load_state
!= UNIT_LOADED
)
1971 if (!unit_can_reload(u
))
1974 state
= unit_active_state(u
);
1975 if (state
== UNIT_RELOADING
)
1978 if (state
!= UNIT_ACTIVE
)
1979 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
), "Unit cannot be reloaded because it is inactive.");
1981 following
= unit_following(u
);
1983 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
1984 return unit_reload(following
);
1987 unit_add_to_dbus_queue(u
);
1989 if (!UNIT_VTABLE(u
)->reload
) {
1990 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
1991 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), 0);
1995 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1997 return UNIT_VTABLE(u
)->reload(u
);
2000 bool unit_can_reload(Unit
*u
) {
2003 if (UNIT_VTABLE(u
)->can_reload
)
2004 return UNIT_VTABLE(u
)->can_reload(u
);
2006 if (unit_has_dependency(u
, UNIT_ATOM_PROPAGATES_RELOAD_TO
, NULL
))
2009 return UNIT_VTABLE(u
)->reload
;
2012 bool unit_is_unneeded(Unit
*u
) {
2016 if (!u
->stop_when_unneeded
)
2019 /* Don't clean up while the unit is transitioning or is even inactive. */
2020 if (unit_active_state(u
) != UNIT_ACTIVE
)
2025 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_PINS_STOP_WHEN_UNNEEDED
) {
2026 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
2027 * restart, then don't clean this one up. */
2032 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2035 if (unit_will_restart(other
))
2042 bool unit_is_upheld_by_active(Unit
*u
, Unit
**ret_culprit
) {
2047 /* Checks if the unit needs to be started because it currently is not running, but some other unit
2048 * that is active declared an Uphold= dependencies on it */
2050 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)) || u
->job
) {
2052 *ret_culprit
= NULL
;
2056 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_START_STEADILY
) {
2060 if (UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
2062 *ret_culprit
= other
;
2068 *ret_culprit
= NULL
;
2072 bool unit_is_bound_by_inactive(Unit
*u
, Unit
**ret_culprit
) {
2077 /* Checks whether this unit is bound to another unit that is inactive, i.e. whether we should stop
2078 * because the other unit is down. */
2080 if (unit_active_state(u
) != UNIT_ACTIVE
|| u
->job
) {
2081 /* Don't clean up while the unit is transitioning or is even inactive. */
2083 *ret_culprit
= NULL
;
2087 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
2091 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
))) {
2093 *ret_culprit
= other
;
2100 *ret_culprit
= NULL
;
2104 static void check_unneeded_dependencies(Unit
*u
) {
2108 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2110 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_STOP_WHEN_UNNEEDED_QUEUE
)
2111 unit_submit_to_stop_when_unneeded_queue(other
);
2114 static void check_uphold_dependencies(Unit
*u
) {
2118 /* Add all units this unit depends on to the queue that processes Uphold= behaviour. */
2120 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_START_WHEN_UPHELD_QUEUE
)
2121 unit_submit_to_start_when_upheld_queue(other
);
2124 static void check_bound_by_dependencies(Unit
*u
) {
2128 /* Add all units this unit depends on to the queue that processes BindsTo= stop behaviour. */
2130 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_CANNOT_BE_ACTIVE_WITHOUT_QUEUE
)
2131 unit_submit_to_stop_when_bound_queue(other
);
2134 static void retroactively_start_dependencies(Unit
*u
) {
2138 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2140 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_REPLACE
) /* Requires= + BindsTo= */
2141 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2142 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2143 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2145 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_FAIL
) /* Wants= */
2146 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2147 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2148 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2150 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_START
) /* Conflicts= (and inverse) */
2151 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2152 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2155 static void retroactively_stop_dependencies(Unit
*u
) {
2159 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2161 /* Pull down units which are bound to us recursively if enabled */
2162 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_STOP
) /* BoundBy= */
2163 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2164 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2167 void unit_start_on_failure(
2169 const char *dependency_name
,
2170 UnitDependencyAtom atom
,
2173 bool logged
= false;
2178 assert(dependency_name
);
2179 assert(IN_SET(atom
, UNIT_ATOM_ON_SUCCESS
, UNIT_ATOM_ON_FAILURE
));
2181 /* Act on OnFailure= and OnSuccess= dependencies */
2183 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
2184 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2187 log_unit_info(u
, "Triggering %s dependencies.", dependency_name
);
2191 r
= manager_add_job(u
->manager
, JOB_START
, other
, job_mode
, NULL
, &error
, NULL
);
2193 log_unit_warning_errno(
2194 u
, r
, "Failed to enqueue %s job, ignoring: %s",
2195 dependency_name
, bus_error_message(&error
, r
));
2199 log_unit_debug(u
, "Triggering %s dependencies done.", dependency_name
);
2202 void unit_trigger_notify(Unit
*u
) {
2207 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_TRIGGERED_BY
)
2208 if (UNIT_VTABLE(other
)->trigger_notify
)
2209 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2212 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2213 if (condition_notice
&& log_level
> LOG_NOTICE
)
2215 if (condition_info
&& log_level
> LOG_INFO
)
2220 static int unit_log_resources(Unit
*u
) {
2221 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4];
2222 bool any_traffic
= false, have_ip_accounting
= false, any_io
= false, have_io_accounting
= false;
2223 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
, *rr
= NULL
, *wr
= NULL
;
2224 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a threshold */
2225 size_t n_message_parts
= 0, n_iovec
= 0;
2226 char* message_parts
[1 + 2 + 2 + 1], *t
;
2227 nsec_t nsec
= NSEC_INFINITY
;
2229 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2230 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2231 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2232 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2233 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2235 const char* const io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2236 [CGROUP_IO_READ_BYTES
] = "IO_METRIC_READ_BYTES",
2237 [CGROUP_IO_WRITE_BYTES
] = "IO_METRIC_WRITE_BYTES",
2238 [CGROUP_IO_READ_OPERATIONS
] = "IO_METRIC_READ_OPERATIONS",
2239 [CGROUP_IO_WRITE_OPERATIONS
] = "IO_METRIC_WRITE_OPERATIONS",
2244 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2245 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2246 * information and the complete data in structured fields. */
2248 (void) unit_get_cpu_usage(u
, &nsec
);
2249 if (nsec
!= NSEC_INFINITY
) {
2250 char buf
[FORMAT_TIMESPAN_MAX
] = "";
2252 /* Format the CPU time for inclusion in the structured log message */
2253 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2257 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2259 /* Format the CPU time for inclusion in the human language message string */
2260 format_timespan(buf
, sizeof(buf
), nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
);
2261 t
= strjoin("consumed ", buf
, " CPU time");
2267 message_parts
[n_message_parts
++] = t
;
2269 log_level
= raise_level(log_level
,
2270 nsec
> NOTICEWORTHY_CPU_NSEC
,
2271 nsec
> MENTIONWORTHY_CPU_NSEC
);
2274 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2275 char buf
[FORMAT_BYTES_MAX
] = "";
2276 uint64_t value
= UINT64_MAX
;
2278 assert(io_fields
[k
]);
2280 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2281 if (value
== UINT64_MAX
)
2284 have_io_accounting
= true;
2288 /* Format IO accounting data for inclusion in the structured log message */
2289 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2293 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2295 /* Format the IO accounting data for inclusion in the human language message string, but only
2296 * for the bytes counters (and not for the operations counters) */
2297 if (k
== CGROUP_IO_READ_BYTES
) {
2299 rr
= strjoin("read ", format_bytes(buf
, sizeof(buf
), value
), " from disk");
2304 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2306 wr
= strjoin("written ", format_bytes(buf
, sizeof(buf
), value
), " to disk");
2313 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2314 log_level
= raise_level(log_level
,
2315 value
> MENTIONWORTHY_IO_BYTES
,
2316 value
> NOTICEWORTHY_IO_BYTES
);
2319 if (have_io_accounting
) {
2322 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2324 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2329 k
= strdup("no IO");
2335 message_parts
[n_message_parts
++] = k
;
2339 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2340 char buf
[FORMAT_BYTES_MAX
] = "";
2341 uint64_t value
= UINT64_MAX
;
2343 assert(ip_fields
[m
]);
2345 (void) unit_get_ip_accounting(u
, m
, &value
);
2346 if (value
== UINT64_MAX
)
2349 have_ip_accounting
= true;
2353 /* Format IP accounting data for inclusion in the structured log message */
2354 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2358 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2360 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2361 * bytes counters (and not for the packets counters) */
2362 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2364 igress
= strjoin("received ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2369 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2371 egress
= strjoin("sent ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2378 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2379 log_level
= raise_level(log_level
,
2380 value
> MENTIONWORTHY_IP_BYTES
,
2381 value
> NOTICEWORTHY_IP_BYTES
);
2384 /* This check is here because it is the earliest point following all possible log_level assignments. If
2385 * log_level is assigned anywhere after this point, move this check. */
2386 if (!unit_log_level_test(u
, log_level
)) {
2391 if (have_ip_accounting
) {
2394 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2396 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2401 k
= strdup("no IP traffic");
2407 message_parts
[n_message_parts
++] = k
;
2411 /* Is there any accounting data available at all? */
2417 if (n_message_parts
== 0)
2418 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2420 _cleanup_free_
char *joined
= NULL
;
2422 message_parts
[n_message_parts
] = NULL
;
2424 joined
= strv_join(message_parts
, ", ");
2430 joined
[0] = ascii_toupper(joined
[0]);
2431 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2434 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2435 * and hence don't increase n_iovec for them */
2436 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2437 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2439 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2440 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2442 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2443 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2445 log_unit_struct_iovec(u
, log_level
, iovec
, n_iovec
+ 4);
2449 for (size_t i
= 0; i
< n_message_parts
; i
++)
2450 free(message_parts
[i
]);
2452 for (size_t i
= 0; i
< n_iovec
; i
++)
2453 free(iovec
[i
].iov_base
);
2459 static void unit_update_on_console(Unit
*u
) {
2464 b
= unit_needs_console(u
);
2465 if (u
->on_console
== b
)
2470 manager_ref_console(u
->manager
);
2472 manager_unref_console(u
->manager
);
2475 static void unit_emit_audit_start(Unit
*u
) {
2478 if (u
->type
!= UNIT_SERVICE
)
2481 /* Write audit record if we have just finished starting up */
2482 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2486 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2489 if (u
->type
!= UNIT_SERVICE
)
2493 /* Write audit record if we have just finished shutting down */
2494 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2495 u
->in_audit
= false;
2497 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2498 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2500 if (state
== UNIT_INACTIVE
)
2501 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2505 static bool unit_process_job(Job
*j
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2506 bool unexpected
= false;
2511 if (j
->state
== JOB_WAITING
)
2513 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2515 job_add_to_run_queue(j
);
2517 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2518 * hence needs to invalidate jobs. */
2523 case JOB_VERIFY_ACTIVE
:
2525 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2526 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2527 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2530 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2531 if (ns
== UNIT_FAILED
)
2532 result
= JOB_FAILED
;
2536 job_finish_and_invalidate(j
, result
, true, false);
2543 case JOB_RELOAD_OR_START
:
2544 case JOB_TRY_RELOAD
:
2546 if (j
->state
== JOB_RUNNING
) {
2547 if (ns
== UNIT_ACTIVE
)
2548 job_finish_and_invalidate(j
, (flags
& UNIT_NOTIFY_RELOAD_FAILURE
) ? JOB_FAILED
: JOB_DONE
, true, false);
2549 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2552 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2553 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2561 case JOB_TRY_RESTART
:
2563 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2564 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2565 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2567 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2573 assert_not_reached("Job type unknown");
2579 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2584 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2585 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2587 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2588 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2589 * remounted this function will be called too! */
2593 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2594 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2595 unit_add_to_dbus_queue(u
);
2597 /* Update systemd-oomd on the property/state change */
2599 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2601 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2602 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2603 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2604 * have the information on the property. Thus, indiscriminately send an update. */
2605 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2606 (void) manager_varlink_send_managed_oom_update(u
);
2609 /* Update timestamps for state changes */
2610 if (!MANAGER_IS_RELOADING(m
)) {
2611 dual_timestamp_get(&u
->state_change_timestamp
);
2613 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2614 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2615 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2616 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2618 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2619 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2620 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2621 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2624 /* Keep track of failed units */
2625 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2627 /* Make sure the cgroup and state files are always removed when we become inactive */
2628 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2629 SET_FLAG(u
->markers
,
2630 (1u << UNIT_MARKER_NEEDS_RELOAD
)|(1u << UNIT_MARKER_NEEDS_RESTART
),
2632 unit_prune_cgroup(u
);
2633 unit_unlink_state_files(u
);
2634 } else if (ns
!= os
&& ns
== UNIT_RELOADING
)
2635 SET_FLAG(u
->markers
, 1u << UNIT_MARKER_NEEDS_RELOAD
, false);
2637 unit_update_on_console(u
);
2639 if (!MANAGER_IS_RELOADING(m
)) {
2642 /* Let's propagate state changes to the job */
2644 unexpected
= unit_process_job(u
->job
, ns
, flags
);
2648 /* If this state change happened without being requested by a job, then let's retroactively start or
2649 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2650 * additional jobs just because something is already activated. */
2653 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2654 retroactively_start_dependencies(u
);
2655 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2656 retroactively_stop_dependencies(u
);
2659 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2660 log_unit_debug(u
, "Unit entered failed state.");
2662 if (!(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2663 unit_start_on_failure(u
, "OnFailure=", UNIT_ATOM_ON_FAILURE
, u
->on_failure_job_mode
);
2666 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2667 /* This unit just finished starting up */
2669 unit_emit_audit_start(u
);
2670 manager_send_unit_plymouth(m
, u
);
2673 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2674 /* This unit just stopped/failed. */
2676 unit_emit_audit_stop(u
, ns
);
2677 unit_log_resources(u
);
2680 if (ns
== UNIT_INACTIVE
&& !IN_SET(os
, UNIT_FAILED
, UNIT_INACTIVE
, UNIT_MAINTENANCE
) &&
2681 !(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2682 unit_start_on_failure(u
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
, u
->on_success_job_mode
);
2685 manager_recheck_journal(m
);
2686 manager_recheck_dbus(m
);
2688 unit_trigger_notify(u
);
2690 if (!MANAGER_IS_RELOADING(m
)) {
2691 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2692 reason
= strjoina("unit ", u
->id
, " failed");
2693 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2694 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2695 reason
= strjoina("unit ", u
->id
, " succeeded");
2696 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2700 /* And now, add the unit or depending units to various queues that will act on the new situation if
2701 * needed. These queues generally check for continuous state changes rather than events (like most of
2702 * the state propagation above), and do work deferred instead of instantly, since they typically
2703 * don't want to run during reloading, and usually involve checking combined state of multiple units
2706 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2707 /* Stop unneeded units and bound-by units regardless if going down was expected or not */
2708 check_unneeded_dependencies(u
);
2709 check_bound_by_dependencies(u
);
2711 /* Maybe someone wants us to remain up? */
2712 unit_submit_to_start_when_upheld_queue(u
);
2714 /* Maybe the unit should be GC'ed now? */
2715 unit_add_to_gc_queue(u
);
2718 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2719 /* Start uphold units regardless if going up was expected or not */
2720 check_uphold_dependencies(u
);
2722 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2723 unit_submit_to_stop_when_unneeded_queue(u
);
2725 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens
2726 * when something BindsTo= to a Type=oneshot unit, as these units go directly from starting to
2727 * inactive, without ever entering started.) */
2728 unit_submit_to_stop_when_bound_queue(u
);
2732 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2736 assert(pid_is_valid(pid
));
2738 /* Watch a specific PID */
2740 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2741 * opportunity to remove any stalled references to this PID as they can be created
2742 * easily (when watching a process which is not our direct child). */
2744 manager_unwatch_pid(u
->manager
, pid
);
2746 r
= set_ensure_allocated(&u
->pids
, NULL
);
2750 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2754 /* First try, let's add the unit keyed by "pid". */
2755 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2761 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2762 * to an array of Units rather than just a Unit), lists us already. */
2764 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2766 for (; array
[n
]; n
++)
2770 if (found
) /* Found it already? if so, do nothing */
2775 /* Allocate a new array */
2776 new_array
= new(Unit
*, n
+ 2);
2780 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2782 new_array
[n
+1] = NULL
;
2784 /* Add or replace the old array */
2785 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2796 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2803 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2807 assert(pid_is_valid(pid
));
2809 /* First let's drop the unit in case it's keyed as "pid". */
2810 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2812 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2813 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2815 /* Let's iterate through the array, dropping our own entry */
2818 for (size_t n
= 0; array
[n
]; n
++)
2820 array
[m
++] = array
[n
];
2824 /* The array is now empty, remove the entire entry */
2825 assert_se(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2830 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2833 void unit_unwatch_all_pids(Unit
*u
) {
2836 while (!set_isempty(u
->pids
))
2837 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2839 u
->pids
= set_free(u
->pids
);
2842 static void unit_tidy_watch_pids(Unit
*u
) {
2843 pid_t except1
, except2
;
2848 /* Cleans dead PIDs from our list */
2850 except1
= unit_main_pid(u
);
2851 except2
= unit_control_pid(u
);
2853 SET_FOREACH(e
, u
->pids
) {
2854 pid_t pid
= PTR_TO_PID(e
);
2856 if (pid
== except1
|| pid
== except2
)
2859 if (!pid_is_unwaited(pid
))
2860 unit_unwatch_pid(u
, pid
);
2864 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2870 unit_tidy_watch_pids(u
);
2871 unit_watch_all_pids(u
);
2873 /* If the PID set is empty now, then let's finish this off. */
2874 unit_synthesize_cgroup_empty_event(u
);
2879 int unit_enqueue_rewatch_pids(Unit
*u
) {
2884 if (!u
->cgroup_path
)
2887 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2890 if (r
> 0) /* On unified we can use proper notifications */
2893 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2894 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2895 * involves issuing kill(pid, 0) on all processes we watch. */
2897 if (!u
->rewatch_pids_event_source
) {
2898 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2900 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2902 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2904 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2906 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
2908 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2910 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2913 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2915 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2920 void unit_dequeue_rewatch_pids(Unit
*u
) {
2924 if (!u
->rewatch_pids_event_source
)
2927 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
2929 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
2931 u
->rewatch_pids_event_source
= sd_event_source_unref(u
->rewatch_pids_event_source
);
2934 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2936 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2940 case JOB_VERIFY_ACTIVE
:
2943 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2944 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
2949 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2950 * external events), hence it makes no sense to permit enqueuing such a request either. */
2951 return !u
->perpetual
;
2954 case JOB_TRY_RESTART
:
2955 return unit_can_stop(u
) && unit_can_start(u
);
2958 case JOB_TRY_RELOAD
:
2959 return unit_can_reload(u
);
2961 case JOB_RELOAD_OR_START
:
2962 return unit_can_reload(u
) && unit_can_start(u
);
2965 assert_not_reached("Invalid job type");
2969 int unit_add_dependency(
2974 UnitDependencyMask mask
) {
2976 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
2977 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
2978 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
2979 [UNIT_WANTS
] = UNIT_WANTED_BY
,
2980 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
2981 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
2982 [UNIT_UPHOLDS
] = UNIT_UPHELD_BY
,
2983 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
2984 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
2985 [UNIT_WANTED_BY
] = UNIT_WANTS
,
2986 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
2987 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
2988 [UNIT_UPHELD_BY
] = UNIT_UPHOLDS
,
2989 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
2990 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
2991 [UNIT_BEFORE
] = UNIT_AFTER
,
2992 [UNIT_AFTER
] = UNIT_BEFORE
,
2993 [UNIT_ON_SUCCESS
] = UNIT_ON_SUCCESS_OF
,
2994 [UNIT_ON_SUCCESS_OF
] = UNIT_ON_SUCCESS
,
2995 [UNIT_ON_FAILURE
] = UNIT_ON_FAILURE_OF
,
2996 [UNIT_ON_FAILURE_OF
] = UNIT_ON_FAILURE
,
2997 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
2998 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
2999 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3000 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3001 [UNIT_PROPAGATES_STOP_TO
] = UNIT_STOP_PROPAGATED_FROM
,
3002 [UNIT_STOP_PROPAGATED_FROM
] = UNIT_PROPAGATES_STOP_TO
,
3003 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
, /* symmetric! 👓 */
3004 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3005 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3006 [UNIT_IN_SLICE
] = UNIT_SLICE_OF
,
3007 [UNIT_SLICE_OF
] = UNIT_IN_SLICE
,
3009 Unit
*original_u
= u
, *original_other
= other
;
3010 UnitDependencyAtom a
;
3013 /* Helper to know whether sending a notification is necessary or not: if the dependency is already
3014 * there, no need to notify! */
3018 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3021 u
= unit_follow_merge(u
);
3022 other
= unit_follow_merge(other
);
3023 a
= unit_dependency_to_atom(d
);
3026 /* We won't allow dependencies on ourselves. We will not consider them an error however. */
3028 unit_maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
3032 /* Note that ordering a device unit after a unit is permitted since it allows to start its job
3033 * running timeout at a specific time. */
3034 if (FLAGS_SET(a
, UNIT_ATOM_BEFORE
) && other
->type
== UNIT_DEVICE
) {
3035 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3039 if (FLAGS_SET(a
, UNIT_ATOM_ON_FAILURE
) && !UNIT_VTABLE(u
)->can_fail
) {
3040 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3044 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERS
) && !UNIT_VTABLE(u
)->can_trigger
)
3045 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3046 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3047 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERED_BY
) && !UNIT_VTABLE(other
)->can_trigger
)
3048 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3049 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3051 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && other
->type
!= UNIT_SLICE
)
3052 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3053 "Requested dependency Slice=%s refused (%s is not a slice unit).", other
->id
, other
->id
);
3054 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && u
->type
!= UNIT_SLICE
)
3055 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3056 "Requested dependency SliceOf=%s refused (%s is not a slice unit).", other
->id
, u
->id
);
3058 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && !UNIT_HAS_CGROUP_CONTEXT(u
))
3059 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3060 "Requested dependency Slice=%s refused (%s is not a cgroup unit).", other
->id
, u
->id
);
3062 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && !UNIT_HAS_CGROUP_CONTEXT(other
))
3063 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3064 "Requested dependency SliceOf=%s refused (%s is not a cgroup unit).", other
->id
, other
->id
);
3066 r
= unit_add_dependency_hashmap(&u
->dependencies
, d
, other
, mask
, 0);
3071 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
3072 r
= unit_add_dependency_hashmap(&other
->dependencies
, inverse_table
[d
], u
, 0, mask
);
3079 if (add_reference
) {
3080 r
= unit_add_dependency_hashmap(&u
->dependencies
, UNIT_REFERENCES
, other
, mask
, 0);
3086 r
= unit_add_dependency_hashmap(&other
->dependencies
, UNIT_REFERENCED_BY
, u
, 0, mask
);
3094 unit_add_to_dbus_queue(u
);
3099 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3104 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3108 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3111 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3119 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3126 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3128 _cleanup_free_
char *i
= NULL
;
3130 r
= unit_name_to_prefix(u
->id
, &i
);
3134 r
= unit_name_replace_instance(name
, i
, buf
);
3143 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3144 _cleanup_free_
char *buf
= NULL
;
3151 r
= resolve_template(u
, name
, &buf
, &name
);
3155 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3159 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3162 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3163 _cleanup_free_
char *buf
= NULL
;
3170 r
= resolve_template(u
, name
, &buf
, &name
);
3174 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3178 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3181 int set_unit_path(const char *p
) {
3182 /* This is mostly for debug purposes */
3183 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
3189 char *unit_dbus_path(Unit
*u
) {
3195 return unit_dbus_path_from_name(u
->id
);
3198 char *unit_dbus_path_invocation_id(Unit
*u
) {
3201 if (sd_id128_is_null(u
->invocation_id
))
3204 return unit_dbus_path_from_name(u
->invocation_id_string
);
3207 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3212 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3214 if (sd_id128_equal(u
->invocation_id
, id
))
3217 if (!sd_id128_is_null(u
->invocation_id
))
3218 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3220 if (sd_id128_is_null(id
)) {
3225 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3229 u
->invocation_id
= id
;
3230 sd_id128_to_string(id
, u
->invocation_id_string
);
3232 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3239 u
->invocation_id
= SD_ID128_NULL
;
3240 u
->invocation_id_string
[0] = 0;
3244 int unit_set_slice(Unit
*u
, Unit
*slice
, UnitDependencyMask mask
) {
3250 /* Sets the unit slice if it has not been set before. Is extra careful, to only allow this for units
3251 * that actually have a cgroup context. Also, we don't allow to set this for slices (since the parent
3252 * slice is derived from the name). Make sure the unit we set is actually a slice. */
3254 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3257 if (u
->type
== UNIT_SLICE
)
3260 if (unit_active_state(u
) != UNIT_INACTIVE
)
3263 if (slice
->type
!= UNIT_SLICE
)
3266 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3267 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3270 if (UNIT_GET_SLICE(u
) == slice
)
3273 /* Disallow slice changes if @u is already bound to cgroups */
3274 if (UNIT_GET_SLICE(u
) && u
->cgroup_realized
)
3277 r
= unit_add_dependency(u
, UNIT_IN_SLICE
, slice
, true, mask
);
3284 int unit_set_default_slice(Unit
*u
) {
3285 const char *slice_name
;
3291 if (UNIT_GET_SLICE(u
))
3295 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3297 /* Implicitly place all instantiated units in their
3298 * own per-template slice */
3300 r
= unit_name_to_prefix(u
->id
, &prefix
);
3304 /* The prefix is already escaped, but it might include
3305 * "-" which has a special meaning for slice units,
3306 * hence escape it here extra. */
3307 escaped
= unit_name_escape(prefix
);
3311 if (MANAGER_IS_SYSTEM(u
->manager
))
3312 slice_name
= strjoina("system-", escaped
, ".slice");
3314 slice_name
= strjoina("app-", escaped
, ".slice");
3316 } else if (unit_is_extrinsic(u
))
3317 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3318 * the root slice. They don't really belong in one of the subslices. */
3319 slice_name
= SPECIAL_ROOT_SLICE
;
3321 else if (MANAGER_IS_SYSTEM(u
->manager
))
3322 slice_name
= SPECIAL_SYSTEM_SLICE
;
3324 slice_name
= SPECIAL_APP_SLICE
;
3326 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3330 return unit_set_slice(u
, slice
, UNIT_DEPENDENCY_FILE
);
3333 const char *unit_slice_name(Unit
*u
) {
3337 slice
= UNIT_GET_SLICE(u
);
3344 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3345 _cleanup_free_
char *t
= NULL
;
3352 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3355 if (unit_has_name(u
, t
))
3358 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3359 assert(r
< 0 || *_found
!= u
);
3363 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3364 const char *new_owner
;
3371 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3373 bus_log_parse_error(r
);
3377 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3378 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3383 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3384 const sd_bus_error
*e
;
3385 const char *new_owner
;
3392 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3394 e
= sd_bus_message_get_error(message
);
3396 if (!sd_bus_error_has_name(e
, "org.freedesktop.DBus.Error.NameHasNoOwner"))
3397 log_unit_error(u
, "Unexpected error response from GetNameOwner(): %s", e
->message
);
3401 r
= sd_bus_message_read(message
, "s", &new_owner
);
3403 return bus_log_parse_error(r
);
3405 assert(!isempty(new_owner
));
3408 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3409 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3414 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3422 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3425 match
= strjoina("type='signal',"
3426 "sender='org.freedesktop.DBus',"
3427 "path='/org/freedesktop/DBus',"
3428 "interface='org.freedesktop.DBus',"
3429 "member='NameOwnerChanged',"
3430 "arg0='", name
, "'");
3432 r
= sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3436 r
= sd_bus_call_method_async(
3438 &u
->get_name_owner_slot
,
3439 "org.freedesktop.DBus",
3440 "/org/freedesktop/DBus",
3441 "org.freedesktop.DBus",
3443 get_name_owner_handler
,
3447 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3451 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3455 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3461 /* Watch a specific name on the bus. We only support one unit
3462 * watching each name for now. */
3464 if (u
->manager
->api_bus
) {
3465 /* If the bus is already available, install the match directly.
3466 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3467 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3469 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3472 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3474 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3475 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3476 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3482 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3486 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3487 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3488 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3491 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3492 _cleanup_free_
char *e
= NULL
;
3498 /* Adds in links to the device node that this unit is based on */
3502 if (!is_device_path(what
))
3505 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3506 if (!unit_type_supported(UNIT_DEVICE
))
3509 r
= unit_name_from_path(what
, ".device", &e
);
3513 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3517 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3518 dep
= UNIT_BINDS_TO
;
3520 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3521 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3522 device
, true, mask
);
3525 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3526 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3534 if (!path_startswith(what
, "/dev/"))
3537 /* If we don't support devices, then also don't bother with blockdev@.target */
3538 if (!unit_type_supported(UNIT_DEVICE
))
3541 r
= unit_name_path_escape(what
, &escaped
);
3545 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3549 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3552 int unit_coldplug(Unit
*u
) {
3559 /* Make sure we don't enter a loop, when coldplugging recursively. */
3563 u
->coldplugged
= true;
3565 STRV_FOREACH(i
, u
->deserialized_refs
) {
3566 q
= bus_unit_track_add_name(u
, *i
);
3567 if (q
< 0 && r
>= 0)
3570 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3572 if (UNIT_VTABLE(u
)->coldplug
) {
3573 q
= UNIT_VTABLE(u
)->coldplug(u
);
3574 if (q
< 0 && r
>= 0)
3578 uj
= u
->job
?: u
->nop_job
;
3580 q
= job_coldplug(uj
);
3581 if (q
< 0 && r
>= 0)
3588 void unit_catchup(Unit
*u
) {
3591 if (UNIT_VTABLE(u
)->catchup
)
3592 UNIT_VTABLE(u
)->catchup(u
);
3595 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3601 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3602 * are never out-of-date. */
3603 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3606 if (stat(path
, &st
) < 0)
3607 /* What, cannot access this anymore? */
3611 /* For masked files check if they are still so */
3612 return !null_or_empty(&st
);
3614 /* For non-empty files check the mtime */
3615 return timespec_load(&st
.st_mtim
) > mtime
;
3620 bool unit_need_daemon_reload(Unit
*u
) {
3621 _cleanup_strv_free_
char **t
= NULL
;
3626 /* For unit files, we allow masking… */
3627 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3628 u
->load_state
== UNIT_MASKED
))
3631 /* Source paths should not be masked… */
3632 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3635 if (u
->load_state
== UNIT_LOADED
)
3636 (void) unit_find_dropin_paths(u
, &t
);
3637 if (!strv_equal(u
->dropin_paths
, t
))
3640 /* … any drop-ins that are masked are simply omitted from the list. */
3641 STRV_FOREACH(path
, u
->dropin_paths
)
3642 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3648 void unit_reset_failed(Unit
*u
) {
3651 if (UNIT_VTABLE(u
)->reset_failed
)
3652 UNIT_VTABLE(u
)->reset_failed(u
);
3654 ratelimit_reset(&u
->start_ratelimit
);
3655 u
->start_limit_hit
= false;
3658 Unit
*unit_following(Unit
*u
) {
3661 if (UNIT_VTABLE(u
)->following
)
3662 return UNIT_VTABLE(u
)->following(u
);
3667 bool unit_stop_pending(Unit
*u
) {
3670 /* This call does check the current state of the unit. It's
3671 * hence useful to be called from state change calls of the
3672 * unit itself, where the state isn't updated yet. This is
3673 * different from unit_inactive_or_pending() which checks both
3674 * the current state and for a queued job. */
3676 return unit_has_job_type(u
, JOB_STOP
);
3679 bool unit_inactive_or_pending(Unit
*u
) {
3682 /* Returns true if the unit is inactive or going down */
3684 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3687 if (unit_stop_pending(u
))
3693 bool unit_active_or_pending(Unit
*u
) {
3696 /* Returns true if the unit is active or going up */
3698 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3702 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3708 bool unit_will_restart_default(Unit
*u
) {
3711 return unit_has_job_type(u
, JOB_START
);
3714 bool unit_will_restart(Unit
*u
) {
3717 if (!UNIT_VTABLE(u
)->will_restart
)
3720 return UNIT_VTABLE(u
)->will_restart(u
);
3723 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3725 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3726 assert(SIGNAL_VALID(signo
));
3728 if (!UNIT_VTABLE(u
)->kill
)
3731 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3734 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3735 _cleanup_set_free_ Set
*pid_set
= NULL
;
3738 pid_set
= set_new(NULL
);
3742 /* Exclude the main/control pids from being killed via the cgroup */
3744 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3749 if (control_pid
> 0) {
3750 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3755 return TAKE_PTR(pid_set
);
3758 static int kill_common_log(pid_t pid
, int signo
, void *userdata
) {
3759 _cleanup_free_
char *comm
= NULL
;
3764 (void) get_process_comm(pid
, &comm
);
3765 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
3766 signal_to_string(signo
), pid
, strna(comm
));
3771 int unit_kill_common(
3777 sd_bus_error
*error
) {
3780 bool killed
= false;
3782 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
3783 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
3784 * stop a service ourselves. */
3786 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3788 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3790 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3793 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3794 if (control_pid
< 0)
3795 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3796 if (control_pid
== 0)
3797 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3800 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3801 if (control_pid
> 0) {
3802 _cleanup_free_
char *comm
= NULL
;
3803 (void) get_process_comm(control_pid
, &comm
);
3805 if (kill(control_pid
, signo
) < 0) {
3806 /* Report this failure both to the logs and to the client */
3807 sd_bus_error_set_errnof(
3809 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
3810 signal_to_string(signo
), control_pid
, strna(comm
));
3811 r
= log_unit_warning_errno(
3813 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
3814 signal_to_string(signo
), control_pid
, strna(comm
));
3816 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
3817 signal_to_string(signo
), control_pid
, strna(comm
));
3822 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3824 _cleanup_free_
char *comm
= NULL
;
3825 (void) get_process_comm(main_pid
, &comm
);
3827 if (kill(main_pid
, signo
) < 0) {
3829 sd_bus_error_set_errnof(
3831 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
3832 signal_to_string(signo
), main_pid
, strna(comm
));
3834 r
= log_unit_warning_errno(
3836 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
3837 signal_to_string(signo
), main_pid
, strna(comm
));
3839 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
3840 signal_to_string(signo
), main_pid
, strna(comm
));
3845 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3846 _cleanup_set_free_ Set
*pid_set
= NULL
;
3849 /* Exclude the main/control pids from being killed via the cgroup */
3850 pid_set
= unit_pid_set(main_pid
, control_pid
);
3854 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
3856 if (!IN_SET(q
, -ESRCH
, -ENOENT
)) {
3858 sd_bus_error_set_errnof(
3860 "Failed to send signal SIG%s to auxiliary processes: %m",
3861 signal_to_string(signo
));
3863 r
= log_unit_warning_errno(
3865 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
3866 signal_to_string(signo
));
3872 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
3873 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
3874 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
3879 int unit_following_set(Unit
*u
, Set
**s
) {
3883 if (UNIT_VTABLE(u
)->following_set
)
3884 return UNIT_VTABLE(u
)->following_set(u
, s
);
3890 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3895 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3896 r
= unit_file_get_state(
3897 u
->manager
->unit_file_scope
,
3900 &u
->unit_file_state
);
3902 u
->unit_file_state
= UNIT_FILE_BAD
;
3905 return u
->unit_file_state
;
3908 int unit_get_unit_file_preset(Unit
*u
) {
3911 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3912 u
->unit_file_preset
= unit_file_query_preset(
3913 u
->manager
->unit_file_scope
,
3915 basename(u
->fragment_path
),
3918 return u
->unit_file_preset
;
3921 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
3927 unit_ref_unset(ref
);
3929 ref
->source
= source
;
3930 ref
->target
= target
;
3931 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
3935 void unit_ref_unset(UnitRef
*ref
) {
3941 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
3942 * be unreferenced now. */
3943 unit_add_to_gc_queue(ref
->target
);
3945 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
3946 ref
->source
= ref
->target
= NULL
;
3949 static int user_from_unit_name(Unit
*u
, char **ret
) {
3951 static const uint8_t hash_key
[] = {
3952 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
3953 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
3956 _cleanup_free_
char *n
= NULL
;
3959 r
= unit_name_to_prefix(u
->id
, &n
);
3963 if (valid_user_group_name(n
, 0)) {
3968 /* If we can't use the unit name as a user name, then let's hash it and use that */
3969 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
3975 int unit_patch_contexts(Unit
*u
) {
3982 /* Patch in the manager defaults into the exec and cgroup
3983 * contexts, _after_ the rest of the settings have been
3986 ec
= unit_get_exec_context(u
);
3988 /* This only copies in the ones that need memory */
3989 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
3990 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
3991 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
3996 if (MANAGER_IS_USER(u
->manager
) &&
3997 !ec
->working_directory
) {
3999 r
= get_home_dir(&ec
->working_directory
);
4003 /* Allow user services to run, even if the
4004 * home directory is missing */
4005 ec
->working_directory_missing_ok
= true;
4008 if (ec
->private_devices
)
4009 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4011 if (ec
->protect_kernel_modules
)
4012 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4014 if (ec
->protect_kernel_logs
)
4015 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4017 if (ec
->protect_clock
)
4018 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4020 if (ec
->dynamic_user
) {
4022 r
= user_from_unit_name(u
, &ec
->user
);
4028 ec
->group
= strdup(ec
->user
);
4033 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4034 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4037 ec
->private_tmp
= true;
4038 ec
->remove_ipc
= true;
4039 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4040 if (ec
->protect_home
== PROTECT_HOME_NO
)
4041 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4043 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4045 ec
->no_new_privileges
= true;
4046 ec
->restrict_suid_sgid
= true;
4050 cc
= unit_get_cgroup_context(u
);
4053 if (ec
->private_devices
&&
4054 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4055 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4057 if ((ec
->root_image
|| !LIST_IS_EMPTY(ec
->mount_images
)) &&
4058 (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
)) {
4061 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4062 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4063 r
= cgroup_add_device_allow(cc
, p
, "rw");
4067 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4068 r
= cgroup_add_device_allow(cc
, p
, "rwm");
4073 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4074 * Same for mapper and verity. */
4075 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4076 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4082 if (ec
->protect_clock
) {
4083 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4092 ExecContext
*unit_get_exec_context(const Unit
*u
) {
4099 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4103 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4106 KillContext
*unit_get_kill_context(Unit
*u
) {
4113 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4117 return (KillContext
*) ((uint8_t*) u
+ offset
);
4120 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4126 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4130 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4133 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4139 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4143 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4146 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4149 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4152 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4153 return u
->manager
->lookup_paths
.transient
;
4155 if (flags
& UNIT_PERSISTENT
)
4156 return u
->manager
->lookup_paths
.persistent_control
;
4158 if (flags
& UNIT_RUNTIME
)
4159 return u
->manager
->lookup_paths
.runtime_control
;
4164 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4170 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4171 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4172 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4173 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4174 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4177 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4178 ret
= specifier_escape(s
);
4185 if (flags
& UNIT_ESCAPE_C
) {
4198 return ret
?: (char*) s
;
4201 return ret
?: strdup(s
);
4204 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4205 _cleanup_free_
char *result
= NULL
;
4209 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4210 * way suitable for ExecStart= stanzas */
4212 STRV_FOREACH(i
, l
) {
4213 _cleanup_free_
char *buf
= NULL
;
4218 p
= unit_escape_setting(*i
, flags
, &buf
);
4222 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4223 if (!GREEDY_REALLOC(result
, n
+ a
+ 1))
4237 if (!GREEDY_REALLOC(result
, n
+ 1))
4242 return TAKE_PTR(result
);
4245 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4246 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4247 const char *dir
, *wrapped
;
4254 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4257 data
= unit_escape_setting(data
, flags
, &escaped
);
4261 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4262 * previous section header is the same */
4264 if (flags
& UNIT_PRIVATE
) {
4265 if (!UNIT_VTABLE(u
)->private_section
)
4268 if (!u
->transient_file
|| u
->last_section_private
< 0)
4269 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4270 else if (u
->last_section_private
== 0)
4271 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4273 if (!u
->transient_file
|| u
->last_section_private
< 0)
4274 data
= strjoina("[Unit]\n", data
);
4275 else if (u
->last_section_private
> 0)
4276 data
= strjoina("\n[Unit]\n", data
);
4279 if (u
->transient_file
) {
4280 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4281 * write to the transient unit file. */
4282 fputs(data
, u
->transient_file
);
4284 if (!endswith(data
, "\n"))
4285 fputc('\n', u
->transient_file
);
4287 /* Remember which section we wrote this entry to */
4288 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4292 dir
= unit_drop_in_dir(u
, flags
);
4296 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4297 "# or an equivalent operation. Do not edit.\n",
4301 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4305 (void) mkdir_p_label(p
, 0755);
4307 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4308 * recreate the cache after every drop-in we write. */
4309 if (u
->manager
->unit_path_cache
) {
4310 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4315 r
= write_string_file_atomic_label(q
, wrapped
);
4319 r
= strv_push(&u
->dropin_paths
, q
);
4324 strv_uniq(u
->dropin_paths
);
4326 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4331 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4332 _cleanup_free_
char *p
= NULL
;
4340 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4343 va_start(ap
, format
);
4344 r
= vasprintf(&p
, format
, ap
);
4350 return unit_write_setting(u
, flags
, name
, p
);
4353 int unit_make_transient(Unit
*u
) {
4354 _cleanup_free_
char *path
= NULL
;
4359 if (!UNIT_VTABLE(u
)->can_transient
)
4362 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4364 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4368 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4369 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4371 RUN_WITH_UMASK(0022) {
4372 f
= fopen(path
, "we");
4377 safe_fclose(u
->transient_file
);
4378 u
->transient_file
= f
;
4380 free_and_replace(u
->fragment_path
, path
);
4382 u
->source_path
= mfree(u
->source_path
);
4383 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4384 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4386 u
->load_state
= UNIT_STUB
;
4388 u
->transient
= true;
4390 unit_add_to_dbus_queue(u
);
4391 unit_add_to_gc_queue(u
);
4393 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4399 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4400 _cleanup_free_
char *comm
= NULL
;
4402 (void) get_process_comm(pid
, &comm
);
4404 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4405 only, like for example systemd's own PAM stub process. */
4406 if (comm
&& comm
[0] == '(')
4409 log_unit_notice(userdata
,
4410 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4413 signal_to_string(sig
));
4418 static int operation_to_signal(const KillContext
*c
, KillOperation k
, bool *noteworthy
) {
4423 case KILL_TERMINATE
:
4424 case KILL_TERMINATE_AND_LOG
:
4425 *noteworthy
= false;
4426 return c
->kill_signal
;
4429 *noteworthy
= false;
4430 return restart_kill_signal(c
);
4434 return c
->final_kill_signal
;
4438 return c
->watchdog_signal
;
4441 assert_not_reached("KillOperation unknown");
4445 int unit_kill_context(
4451 bool main_pid_alien
) {
4453 bool wait_for_exit
= false, send_sighup
;
4454 cg_kill_log_func_t log_func
= NULL
;
4460 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
4461 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
4462 * which is used for user-requested killing of unit processes. */
4464 if (c
->kill_mode
== KILL_NONE
)
4468 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4470 log_func
= log_kill
;
4474 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4479 log_func(main_pid
, sig
, u
);
4481 r
= kill_and_sigcont(main_pid
, sig
);
4482 if (r
< 0 && r
!= -ESRCH
) {
4483 _cleanup_free_
char *comm
= NULL
;
4484 (void) get_process_comm(main_pid
, &comm
);
4486 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4488 if (!main_pid_alien
)
4489 wait_for_exit
= true;
4491 if (r
!= -ESRCH
&& send_sighup
)
4492 (void) kill(main_pid
, SIGHUP
);
4496 if (control_pid
> 0) {
4498 log_func(control_pid
, sig
, u
);
4500 r
= kill_and_sigcont(control_pid
, sig
);
4501 if (r
< 0 && r
!= -ESRCH
) {
4502 _cleanup_free_
char *comm
= NULL
;
4503 (void) get_process_comm(control_pid
, &comm
);
4505 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4507 wait_for_exit
= true;
4509 if (r
!= -ESRCH
&& send_sighup
)
4510 (void) kill(control_pid
, SIGHUP
);
4514 if (u
->cgroup_path
&&
4515 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4516 _cleanup_set_free_ Set
*pid_set
= NULL
;
4518 /* Exclude the main/control pids from being killed via the cgroup */
4519 pid_set
= unit_pid_set(main_pid
, control_pid
);
4523 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4525 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4529 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4530 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
4534 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4535 * we are running in a container or if this is a delegation unit, simply because cgroup
4536 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4537 * of containers it can be confused easily by left-over directories in the cgroup — which
4538 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4539 * there we get proper events. Hence rely on them. */
4541 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4542 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4543 wait_for_exit
= true;
4548 pid_set
= unit_pid_set(main_pid
, control_pid
);
4552 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4561 return wait_for_exit
;
4564 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4565 _cleanup_free_
char *p
= NULL
;
4566 UnitDependencyInfo di
;
4572 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these paths in
4573 * the unit (from the path to the UnitDependencyInfo structure indicating how to the dependency came to
4574 * be). However, we build a prefix table for all possible prefixes so that new appearing mount units can easily
4575 * determine which units to make themselves a dependency of. */
4577 if (!path_is_absolute(path
))
4580 r
= hashmap_ensure_allocated(&u
->requires_mounts_for
, &path_hash_ops
);
4588 path
= path_simplify(p
);
4590 if (!path_is_normalized(path
))
4593 if (hashmap_contains(u
->requires_mounts_for
, path
))
4596 di
= (UnitDependencyInfo
) {
4600 r
= hashmap_put(u
->requires_mounts_for
, path
, di
.data
);
4605 char prefix
[strlen(path
) + 1];
4606 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4609 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4611 _cleanup_free_
char *q
= NULL
;
4613 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4625 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4641 int unit_setup_exec_runtime(Unit
*u
) {
4647 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4650 /* Check if there already is an ExecRuntime for this unit? */
4651 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4655 /* Try to get it from somebody else */
4656 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_JOINS_NAMESPACE_OF
) {
4657 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4662 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4665 int unit_setup_dynamic_creds(Unit
*u
) {
4667 DynamicCreds
*dcreds
;
4672 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4674 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4676 ec
= unit_get_exec_context(u
);
4679 if (!ec
->dynamic_user
)
4682 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4685 bool unit_type_supported(UnitType t
) {
4686 if (_unlikely_(t
< 0))
4688 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4691 if (!unit_vtable
[t
]->supported
)
4694 return unit_vtable
[t
]->supported();
4697 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4703 if (!unit_log_level_test(u
, LOG_NOTICE
))
4706 r
= dir_is_empty(where
);
4707 if (r
> 0 || r
== -ENOTDIR
)
4710 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4714 log_unit_struct(u
, LOG_NOTICE
,
4715 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4716 LOG_UNIT_INVOCATION_ID(u
),
4717 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4721 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4722 _cleanup_free_
char *canonical_where
= NULL
;
4728 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
4730 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4734 /* We will happily ignore a trailing slash (or any redundant slashes) */
4735 if (path_equal(where
, canonical_where
))
4738 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4739 log_unit_struct(u
, LOG_ERR
,
4740 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4741 LOG_UNIT_INVOCATION_ID(u
),
4742 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4748 bool unit_is_pristine(Unit
*u
) {
4751 /* Check if the unit already exists or is already around,
4752 * in a number of different ways. Note that to cater for unit
4753 * types such as slice, we are generally fine with units that
4754 * are marked UNIT_LOADED even though nothing was actually
4755 * loaded, as those unit types don't require a file on disk. */
4757 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4760 !strv_isempty(u
->dropin_paths
) ||
4765 pid_t
unit_control_pid(Unit
*u
) {
4768 if (UNIT_VTABLE(u
)->control_pid
)
4769 return UNIT_VTABLE(u
)->control_pid(u
);
4774 pid_t
unit_main_pid(Unit
*u
) {
4777 if (UNIT_VTABLE(u
)->main_pid
)
4778 return UNIT_VTABLE(u
)->main_pid(u
);
4783 static void unit_unref_uid_internal(
4787 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4791 assert(_manager_unref_uid
);
4793 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4794 * gid_t are actually the same time, with the same validity rules.
4796 * Drops a reference to UID/GID from a unit. */
4798 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4799 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4801 if (!uid_is_valid(*ref_uid
))
4804 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4805 *ref_uid
= UID_INVALID
;
4808 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4809 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4812 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4813 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4816 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4819 unit_unref_uid(u
, destroy_now
);
4820 unit_unref_gid(u
, destroy_now
);
4823 static int unit_ref_uid_internal(
4828 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4834 assert(uid_is_valid(uid
));
4835 assert(_manager_ref_uid
);
4837 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4838 * are actually the same type, and have the same validity rules.
4840 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4841 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4844 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4845 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4847 if (*ref_uid
== uid
)
4850 if (uid_is_valid(*ref_uid
)) /* Already set? */
4853 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4861 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4862 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4865 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4866 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4869 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4874 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4876 if (uid_is_valid(uid
)) {
4877 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4882 if (gid_is_valid(gid
)) {
4883 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4886 unit_unref_uid(u
, false);
4892 return r
> 0 || q
> 0;
4895 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4901 c
= unit_get_exec_context(u
);
4903 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4905 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4910 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4915 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4916 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4917 * objects when no service references the UID/GID anymore. */
4919 r
= unit_ref_uid_gid(u
, uid
, gid
);
4921 unit_add_to_dbus_queue(u
);
4924 int unit_acquire_invocation_id(Unit
*u
) {
4930 r
= sd_id128_randomize(&id
);
4932 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
4934 r
= unit_set_invocation_id(u
, id
);
4936 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
4938 unit_add_to_dbus_queue(u
);
4942 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
4948 /* Copy parameters from manager */
4949 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
4953 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
4954 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
4955 p
->prefix
= u
->manager
->prefix
;
4956 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
4958 /* Copy parameters from unit */
4959 p
->cgroup_path
= u
->cgroup_path
;
4960 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
4962 p
->received_credentials
= u
->manager
->received_credentials
;
4967 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
4973 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
4974 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
4976 (void) unit_realize_cgroup(u
);
4978 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
4982 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
);
4983 (void) ignore_signals(SIGPIPE
);
4985 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
4987 if (u
->cgroup_path
) {
4988 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
4990 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", u
->cgroup_path
);
4998 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5005 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5009 int ret
= EXIT_SUCCESS
;
5012 STRV_FOREACH(i
, paths
) {
5013 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5015 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5023 r
= unit_watch_pid(u
, pid
, true);
5031 static void unit_update_dependency_mask(Hashmap
*deps
, Unit
*other
, UnitDependencyInfo di
) {
5035 if (di
.origin_mask
== 0 && di
.destination_mask
== 0)
5036 /* No bit set anymore, let's drop the whole entry */
5037 assert_se(hashmap_remove(deps
, other
));
5039 /* Mask was reduced, let's update the entry */
5040 assert_se(hashmap_update(deps
, other
, di
.data
) == 0);
5043 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5047 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5052 HASHMAP_FOREACH(deps
, u
->dependencies
) {
5056 UnitDependencyInfo di
;
5061 HASHMAP_FOREACH_KEY(di
.data
, other
, deps
) {
5062 Hashmap
*other_deps
;
5064 if (FLAGS_SET(~mask
, di
.origin_mask
))
5067 di
.origin_mask
&= ~mask
;
5068 unit_update_dependency_mask(deps
, other
, di
);
5070 /* We updated the dependency from our unit to the other unit now. But most
5071 * dependencies imply a reverse dependency. Hence, let's delete that one
5072 * too. For that we go through all dependency types on the other unit and
5073 * delete all those which point to us and have the right mask set. */
5075 HASHMAP_FOREACH(other_deps
, other
->dependencies
) {
5076 UnitDependencyInfo dj
;
5078 dj
.data
= hashmap_get(other_deps
, u
);
5079 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5082 dj
.destination_mask
&= ~mask
;
5083 unit_update_dependency_mask(other_deps
, u
, dj
);
5086 unit_add_to_gc_queue(other
);
5096 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5103 if (MANAGER_IS_SYSTEM(u
->manager
))
5104 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5106 _cleanup_free_
char *user_path
= NULL
;
5107 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5110 p
= strjoin(user_path
, u
->id
);
5120 static int unit_export_invocation_id(Unit
*u
) {
5121 _cleanup_free_
char *p
= NULL
;
5126 if (u
->exported_invocation_id
)
5129 if (sd_id128_is_null(u
->invocation_id
))
5132 r
= unit_get_invocation_path(u
, &p
);
5134 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5136 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5138 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5140 u
->exported_invocation_id
= true;
5144 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5152 if (u
->exported_log_level_max
)
5155 if (c
->log_level_max
< 0)
5158 assert(c
->log_level_max
<= 7);
5160 buf
[0] = '0' + c
->log_level_max
;
5163 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5164 r
= symlink_atomic(buf
, p
);
5166 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5168 u
->exported_log_level_max
= true;
5172 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5173 _cleanup_close_
int fd
= -1;
5174 struct iovec
*iovec
;
5181 if (u
->exported_log_extra_fields
)
5184 if (c
->n_log_extra_fields
<= 0)
5187 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5188 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5190 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5191 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5193 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5194 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5197 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5198 pattern
= strjoina(p
, ".XXXXXX");
5200 fd
= mkostemp_safe(pattern
);
5202 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5204 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5206 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5210 (void) fchmod(fd
, 0644);
5212 if (rename(pattern
, p
) < 0) {
5213 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5217 u
->exported_log_extra_fields
= true;
5221 (void) unlink(pattern
);
5225 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5226 _cleanup_free_
char *buf
= NULL
;
5233 if (u
->exported_log_ratelimit_interval
)
5236 if (c
->log_ratelimit_interval_usec
== 0)
5239 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5241 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5244 r
= symlink_atomic(buf
, p
);
5246 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5248 u
->exported_log_ratelimit_interval
= true;
5252 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5253 _cleanup_free_
char *buf
= NULL
;
5260 if (u
->exported_log_ratelimit_burst
)
5263 if (c
->log_ratelimit_burst
== 0)
5266 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5268 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5271 r
= symlink_atomic(buf
, p
);
5273 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5275 u
->exported_log_ratelimit_burst
= true;
5279 void unit_export_state_files(Unit
*u
) {
5280 const ExecContext
*c
;
5287 if (MANAGER_IS_TEST_RUN(u
->manager
))
5290 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5291 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5292 * the IPC system itself and PID 1 also log to the journal.
5294 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5295 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5296 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5297 * namespace at least.
5299 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5300 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5303 (void) unit_export_invocation_id(u
);
5305 if (!MANAGER_IS_SYSTEM(u
->manager
))
5308 c
= unit_get_exec_context(u
);
5310 (void) unit_export_log_level_max(u
, c
);
5311 (void) unit_export_log_extra_fields(u
, c
);
5312 (void) unit_export_log_ratelimit_interval(u
, c
);
5313 (void) unit_export_log_ratelimit_burst(u
, c
);
5317 void unit_unlink_state_files(Unit
*u
) {
5325 /* Undoes the effect of unit_export_state() */
5327 if (u
->exported_invocation_id
) {
5328 _cleanup_free_
char *invocation_path
= NULL
;
5329 int r
= unit_get_invocation_path(u
, &invocation_path
);
5331 (void) unlink(invocation_path
);
5332 u
->exported_invocation_id
= false;
5336 if (!MANAGER_IS_SYSTEM(u
->manager
))
5339 if (u
->exported_log_level_max
) {
5340 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5343 u
->exported_log_level_max
= false;
5346 if (u
->exported_log_extra_fields
) {
5347 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5350 u
->exported_log_extra_fields
= false;
5353 if (u
->exported_log_ratelimit_interval
) {
5354 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5357 u
->exported_log_ratelimit_interval
= false;
5360 if (u
->exported_log_ratelimit_burst
) {
5361 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5364 u
->exported_log_ratelimit_burst
= false;
5368 int unit_prepare_exec(Unit
*u
) {
5373 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5374 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5375 r
= bpf_firewall_load_custom(u
);
5379 /* Prepares everything so that we can fork of a process for this unit */
5381 (void) unit_realize_cgroup(u
);
5383 if (u
->reset_accounting
) {
5384 (void) unit_reset_accounting(u
);
5385 u
->reset_accounting
= false;
5388 unit_export_state_files(u
);
5390 r
= unit_setup_exec_runtime(u
);
5394 r
= unit_setup_dynamic_creds(u
);
5401 static bool ignore_leftover_process(const char *comm
) {
5402 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5405 int unit_log_leftover_process_start(pid_t pid
, int sig
, void *userdata
) {
5406 _cleanup_free_
char *comm
= NULL
;
5408 (void) get_process_comm(pid
, &comm
);
5410 if (ignore_leftover_process(comm
))
5413 /* During start we print a warning */
5415 log_unit_warning(userdata
,
5416 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5417 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5423 int unit_log_leftover_process_stop(pid_t pid
, int sig
, void *userdata
) {
5424 _cleanup_free_
char *comm
= NULL
;
5426 (void) get_process_comm(pid
, &comm
);
5428 if (ignore_leftover_process(comm
))
5431 /* During stop we only print an informational message */
5433 log_unit_info(userdata
,
5434 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
5440 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
5443 (void) unit_pick_cgroup_path(u
);
5445 if (!u
->cgroup_path
)
5448 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_func
, u
);
5451 bool unit_needs_console(Unit
*u
) {
5453 UnitActiveState state
;
5457 state
= unit_active_state(u
);
5459 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5462 if (UNIT_VTABLE(u
)->needs_console
)
5463 return UNIT_VTABLE(u
)->needs_console(u
);
5465 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5466 ec
= unit_get_exec_context(u
);
5470 return exec_context_may_touch_console(ec
);
5473 const char *unit_label_path(const Unit
*u
) {
5478 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
5479 * when validating access checks. */
5481 p
= u
->source_path
?: u
->fragment_path
;
5485 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
5486 if (null_or_empty_path(p
) > 0)
5492 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5497 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5498 * and not a kernel thread either */
5500 /* First, a simple range check */
5501 if (!pid_is_valid(pid
))
5502 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5504 /* Some extra safety check */
5505 if (pid
== 1 || pid
== getpid_cached())
5506 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5508 /* Don't even begin to bother with kernel threads */
5509 r
= is_kernel_thread(pid
);
5511 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5513 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5515 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5520 void unit_log_success(Unit
*u
) {
5523 log_unit_struct(u
, LOG_INFO
,
5524 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5525 LOG_UNIT_INVOCATION_ID(u
),
5526 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
5529 void unit_log_failure(Unit
*u
, const char *result
) {
5533 log_unit_struct(u
, LOG_WARNING
,
5534 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5535 LOG_UNIT_INVOCATION_ID(u
),
5536 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5537 "UNIT_RESULT=%s", result
);
5540 void unit_log_skip(Unit
*u
, const char *result
) {
5544 log_unit_struct(u
, LOG_INFO
,
5545 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5546 LOG_UNIT_INVOCATION_ID(u
),
5547 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5548 "UNIT_RESULT=%s", result
);
5551 void unit_log_process_exit(
5554 const char *command
,
5564 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5565 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5566 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5570 else if (code
== CLD_EXITED
)
5573 level
= LOG_WARNING
;
5575 log_unit_struct(u
, level
,
5576 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5577 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s",
5579 sigchld_code_to_string(code
), status
,
5580 strna(code
== CLD_EXITED
5581 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5582 : signal_to_string(status
))),
5583 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5584 "EXIT_STATUS=%i", status
,
5585 "COMMAND=%s", strna(command
),
5586 LOG_UNIT_INVOCATION_ID(u
));
5589 int unit_exit_status(Unit
*u
) {
5592 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5593 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5594 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5595 * service process has exited abnormally (signal/coredump). */
5597 if (!UNIT_VTABLE(u
)->exit_status
)
5600 return UNIT_VTABLE(u
)->exit_status(u
);
5603 int unit_failure_action_exit_status(Unit
*u
) {
5608 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5610 if (u
->failure_action_exit_status
>= 0)
5611 return u
->failure_action_exit_status
;
5613 r
= unit_exit_status(u
);
5614 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5620 int unit_success_action_exit_status(Unit
*u
) {
5625 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5627 if (u
->success_action_exit_status
>= 0)
5628 return u
->success_action_exit_status
;
5630 r
= unit_exit_status(u
);
5631 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5637 int unit_test_trigger_loaded(Unit
*u
) {
5640 /* Tests whether the unit to trigger is loaded */
5642 trigger
= UNIT_TRIGGER(u
);
5644 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5645 "Refusing to start, no unit to trigger.");
5646 if (trigger
->load_state
!= UNIT_LOADED
)
5647 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5648 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
5653 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
5657 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
||
5658 (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
&& !unit_will_restart(u
)))
5659 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
5661 exec_context_destroy_credentials(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], u
->id
);
5664 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
5665 UnitActiveState state
;
5669 /* Special return values:
5671 * -EOPNOTSUPP → cleaning not supported for this unit type
5672 * -EUNATCH → cleaning not defined for this resource type
5673 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
5674 * a job queued or similar
5677 if (!UNIT_VTABLE(u
)->clean
)
5683 if (u
->load_state
!= UNIT_LOADED
)
5689 state
= unit_active_state(u
);
5690 if (!IN_SET(state
, UNIT_INACTIVE
))
5693 return UNIT_VTABLE(u
)->clean(u
, mask
);
5696 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
5699 if (!UNIT_VTABLE(u
)->clean
||
5700 u
->load_state
!= UNIT_LOADED
) {
5705 /* When the clean() method is set, can_clean() really should be set too */
5706 assert(UNIT_VTABLE(u
)->can_clean
);
5708 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
5711 bool unit_can_freeze(Unit
*u
) {
5714 if (UNIT_VTABLE(u
)->can_freeze
)
5715 return UNIT_VTABLE(u
)->can_freeze(u
);
5717 return UNIT_VTABLE(u
)->freeze
;
5720 void unit_frozen(Unit
*u
) {
5723 u
->freezer_state
= FREEZER_FROZEN
;
5725 bus_unit_send_pending_freezer_message(u
);
5728 void unit_thawed(Unit
*u
) {
5731 u
->freezer_state
= FREEZER_RUNNING
;
5733 bus_unit_send_pending_freezer_message(u
);
5736 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
5738 int (*method
)(Unit
*);
5742 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
5744 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
5745 if (!method
|| !cg_freezer_supported())
5751 if (u
->load_state
!= UNIT_LOADED
)
5754 s
= unit_active_state(u
);
5755 if (s
!= UNIT_ACTIVE
)
5758 if (IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
))
5768 int unit_freeze(Unit
*u
) {
5769 return unit_freezer_action(u
, FREEZER_FREEZE
);
5772 int unit_thaw(Unit
*u
) {
5773 return unit_freezer_action(u
, FREEZER_THAW
);
5776 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
5777 int unit_freeze_vtable_common(Unit
*u
) {
5778 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
5781 int unit_thaw_vtable_common(Unit
*u
) {
5782 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
5785 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5786 [COLLECT_INACTIVE
] = "inactive",
5787 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5790 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);
5792 Unit
* unit_has_dependency(const Unit
*u
, UnitDependencyAtom atom
, Unit
*other
) {
5797 /* Checks if the unit has a dependency on 'other' with the specified dependency atom. If 'other' is
5798 * NULL checks if the unit has *any* dependency of that atom. Returns 'other' if found (or if 'other'
5799 * is NULL the first entry found), or NULL if not found. */
5801 UNIT_FOREACH_DEPENDENCY(i
, u
, atom
)
5802 if (!other
|| other
== i
)
5808 int unit_get_dependency_array(const Unit
*u
, UnitDependencyAtom atom
, Unit
***ret_array
) {
5809 _cleanup_free_ Unit
**array
= NULL
;
5816 /* Gets a list of units matching a specific atom as array. This is useful when iterating through
5817 * dependencies while modifying them: the array is an "atomic snapshot" of sorts, that can be read
5818 * while the dependency table is continuously updated. */
5820 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
5821 if (!GREEDY_REALLOC(array
, n
+ 1))
5827 *ret_array
= TAKE_PTR(array
);
5829 assert(n
<= INT_MAX
);