1 /* SPDX-License-Identifier: LGPL-2.1+ */
11 #include "sd-messages.h"
13 #include "all-units.h"
14 #include "alloc-util.h"
15 #include "bus-common-errors.h"
17 #include "cgroup-util.h"
18 #include "dbus-unit.h"
24 #include "fileio-label.h"
26 #include "format-util.h"
28 #include "id128-util.h"
30 #include "load-dropin.h"
31 #include "load-fragment.h"
36 #include "parse-util.h"
37 #include "path-util.h"
38 #include "process-util.h"
39 #include "serialize.h"
41 #include "signal-util.h"
42 #include "sparse-endian.h"
44 #include "specifier.h"
45 #include "stat-util.h"
46 #include "stdio-util.h"
47 #include "string-table.h"
48 #include "string-util.h"
50 #include "terminal-util.h"
51 #include "tmpfile-util.h"
52 #include "umask-util.h"
53 #include "unit-name.h"
55 #include "user-util.h"
58 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
59 [UNIT_SERVICE
] = &service_vtable
,
60 [UNIT_SOCKET
] = &socket_vtable
,
61 [UNIT_TARGET
] = &target_vtable
,
62 [UNIT_DEVICE
] = &device_vtable
,
63 [UNIT_MOUNT
] = &mount_vtable
,
64 [UNIT_AUTOMOUNT
] = &automount_vtable
,
65 [UNIT_SWAP
] = &swap_vtable
,
66 [UNIT_TIMER
] = &timer_vtable
,
67 [UNIT_PATH
] = &path_vtable
,
68 [UNIT_SLICE
] = &slice_vtable
,
69 [UNIT_SCOPE
] = &scope_vtable
,
72 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
);
74 Unit
*unit_new(Manager
*m
, size_t size
) {
78 assert(size
>= sizeof(Unit
));
84 u
->names
= set_new(&string_hash_ops
);
89 u
->type
= _UNIT_TYPE_INVALID
;
90 u
->default_dependencies
= true;
91 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
92 u
->unit_file_preset
= -1;
93 u
->on_failure_job_mode
= JOB_REPLACE
;
94 u
->cgroup_inotify_wd
= -1;
95 u
->job_timeout
= USEC_INFINITY
;
96 u
->job_running_timeout
= USEC_INFINITY
;
97 u
->ref_uid
= UID_INVALID
;
98 u
->ref_gid
= GID_INVALID
;
99 u
->cpu_usage_last
= NSEC_INFINITY
;
100 u
->cgroup_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
101 u
->failure_action_exit_status
= u
->success_action_exit_status
= -1;
103 u
->ip_accounting_ingress_map_fd
= -1;
104 u
->ip_accounting_egress_map_fd
= -1;
105 u
->ipv4_allow_map_fd
= -1;
106 u
->ipv6_allow_map_fd
= -1;
107 u
->ipv4_deny_map_fd
= -1;
108 u
->ipv6_deny_map_fd
= -1;
110 u
->last_section_private
= -1;
112 RATELIMIT_INIT(u
->start_limit
, m
->default_start_limit_interval
, m
->default_start_limit_burst
);
113 RATELIMIT_INIT(u
->auto_stop_ratelimit
, 10 * USEC_PER_SEC
, 16);
118 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
119 _cleanup_(unit_freep
) Unit
*u
= NULL
;
122 u
= unit_new(m
, size
);
126 r
= unit_add_name(u
, name
);
135 bool unit_has_name(const Unit
*u
, const char *name
) {
139 return set_contains(u
->names
, (char*) name
);
142 static void unit_init(Unit
*u
) {
149 assert(u
->type
>= 0);
151 cc
= unit_get_cgroup_context(u
);
153 cgroup_context_init(cc
);
155 /* Copy in the manager defaults into the cgroup
156 * context, _before_ the rest of the settings have
157 * been initialized */
159 cc
->cpu_accounting
= u
->manager
->default_cpu_accounting
;
160 cc
->io_accounting
= u
->manager
->default_io_accounting
;
161 cc
->ip_accounting
= u
->manager
->default_ip_accounting
;
162 cc
->blockio_accounting
= u
->manager
->default_blockio_accounting
;
163 cc
->memory_accounting
= u
->manager
->default_memory_accounting
;
164 cc
->tasks_accounting
= u
->manager
->default_tasks_accounting
;
165 cc
->ip_accounting
= u
->manager
->default_ip_accounting
;
167 if (u
->type
!= UNIT_SLICE
)
168 cc
->tasks_max
= u
->manager
->default_tasks_max
;
171 ec
= unit_get_exec_context(u
);
173 exec_context_init(ec
);
175 ec
->keyring_mode
= MANAGER_IS_SYSTEM(u
->manager
) ?
176 EXEC_KEYRING_SHARED
: EXEC_KEYRING_INHERIT
;
179 kc
= unit_get_kill_context(u
);
181 kill_context_init(kc
);
183 if (UNIT_VTABLE(u
)->init
)
184 UNIT_VTABLE(u
)->init(u
);
187 int unit_add_name(Unit
*u
, const char *text
) {
188 _cleanup_free_
char *s
= NULL
, *i
= NULL
;
195 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
200 r
= unit_name_replace_instance(text
, u
->instance
, &s
);
209 if (set_contains(u
->names
, s
))
211 if (hashmap_contains(u
->manager
->units
, s
))
214 if (!unit_name_is_valid(s
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
217 t
= unit_name_to_type(s
);
221 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
224 r
= unit_name_to_instance(s
, &i
);
228 if (i
&& !unit_type_may_template(t
))
231 /* Ensure that this unit is either instanced or not instanced,
232 * but not both. Note that we do allow names with different
233 * instance names however! */
234 if (u
->type
!= _UNIT_TYPE_INVALID
&& !u
->instance
!= !i
)
237 if (!unit_type_may_alias(t
) && !set_isempty(u
->names
))
240 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
243 r
= set_put(u
->names
, s
);
248 r
= hashmap_put(u
->manager
->units
, s
, u
);
250 (void) set_remove(u
->names
, s
);
254 if (u
->type
== _UNIT_TYPE_INVALID
) {
257 u
->instance
= TAKE_PTR(i
);
259 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
266 unit_add_to_dbus_queue(u
);
270 int unit_choose_id(Unit
*u
, const char *name
) {
271 _cleanup_free_
char *t
= NULL
;
278 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
283 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
290 /* Selects one of the names of this unit as the id */
291 s
= set_get(u
->names
, (char*) name
);
295 /* Determine the new instance from the new id */
296 r
= unit_name_to_instance(s
, &i
);
305 unit_add_to_dbus_queue(u
);
310 int unit_set_description(Unit
*u
, const char *description
) {
315 r
= free_and_strdup(&u
->description
, empty_to_null(description
));
319 unit_add_to_dbus_queue(u
);
324 bool unit_may_gc(Unit
*u
) {
325 UnitActiveState state
;
330 /* Checks whether the unit is ready to be unloaded for garbage collection.
331 * Returns true when the unit may be collected, and false if there's some
332 * reason to keep it loaded.
334 * References from other units are *not* checked here. Instead, this is done
335 * in unit_gc_sweep(), but using markers to properly collect dependency loops.
344 state
= unit_active_state(u
);
346 /* If the unit is inactive and failed and no job is queued for it, then release its runtime resources */
347 if (UNIT_IS_INACTIVE_OR_FAILED(state
) &&
348 UNIT_VTABLE(u
)->release_resources
)
349 UNIT_VTABLE(u
)->release_resources(u
);
354 if (sd_bus_track_count(u
->bus_track
) > 0)
357 /* But we keep the unit object around for longer when it is referenced or configured to not be gc'ed */
358 switch (u
->collect_mode
) {
360 case COLLECT_INACTIVE
:
361 if (state
!= UNIT_INACTIVE
)
366 case COLLECT_INACTIVE_OR_FAILED
:
367 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
373 assert_not_reached("Unknown garbage collection mode");
376 if (u
->cgroup_path
) {
377 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
378 * around. Units with active processes should never be collected. */
380 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
382 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", u
->cgroup_path
);
387 if (UNIT_VTABLE(u
)->may_gc
&& !UNIT_VTABLE(u
)->may_gc(u
))
393 void unit_add_to_load_queue(Unit
*u
) {
395 assert(u
->type
!= _UNIT_TYPE_INVALID
);
397 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
400 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
401 u
->in_load_queue
= true;
404 void unit_add_to_cleanup_queue(Unit
*u
) {
407 if (u
->in_cleanup_queue
)
410 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
411 u
->in_cleanup_queue
= true;
414 void unit_add_to_gc_queue(Unit
*u
) {
417 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
423 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
424 u
->in_gc_queue
= true;
427 void unit_add_to_dbus_queue(Unit
*u
) {
429 assert(u
->type
!= _UNIT_TYPE_INVALID
);
431 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
434 /* Shortcut things if nobody cares */
435 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
436 sd_bus_track_count(u
->bus_track
) <= 0 &&
437 set_isempty(u
->manager
->private_buses
)) {
438 u
->sent_dbus_new_signal
= true;
442 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
443 u
->in_dbus_queue
= true;
446 void unit_submit_to_stop_when_unneeded_queue(Unit
*u
) {
449 if (u
->in_stop_when_unneeded_queue
)
452 if (!u
->stop_when_unneeded
)
455 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
458 LIST_PREPEND(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
459 u
->in_stop_when_unneeded_queue
= true;
462 static void bidi_set_free(Unit
*u
, Hashmap
*h
) {
469 /* Frees the hashmap and makes sure we are dropped from the inverse pointers */
471 HASHMAP_FOREACH_KEY(v
, other
, h
, i
) {
474 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
475 hashmap_remove(other
->dependencies
[d
], u
);
477 unit_add_to_gc_queue(other
);
483 static void unit_remove_transient(Unit
*u
) {
491 if (u
->fragment_path
)
492 (void) unlink(u
->fragment_path
);
494 STRV_FOREACH(i
, u
->dropin_paths
) {
495 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
497 p
= dirname_malloc(*i
); /* Get the drop-in directory from the drop-in file */
501 pp
= dirname_malloc(p
); /* Get the config directory from the drop-in directory */
505 /* Only drop transient drop-ins */
506 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
514 static void unit_free_requires_mounts_for(Unit
*u
) {
518 _cleanup_free_
char *path
;
520 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
524 char s
[strlen(path
) + 1];
526 PATH_FOREACH_PREFIX_MORE(s
, path
) {
530 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
534 (void) set_remove(x
, u
);
536 if (set_isempty(x
)) {
537 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
545 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
548 static void unit_done(Unit
*u
) {
557 if (UNIT_VTABLE(u
)->done
)
558 UNIT_VTABLE(u
)->done(u
);
560 ec
= unit_get_exec_context(u
);
562 exec_context_done(ec
);
564 cc
= unit_get_cgroup_context(u
);
566 cgroup_context_done(cc
);
569 void unit_free(Unit
*u
) {
577 if (UNIT_ISSET(u
->slice
)) {
578 /* A unit is being dropped from the tree, make sure our parent slice recalculates the member mask */
579 unit_invalidate_cgroup_members_masks(UNIT_DEREF(u
->slice
));
581 /* And make sure the parent is realized again, updating cgroup memberships */
582 unit_add_to_cgroup_realize_queue(UNIT_DEREF(u
->slice
));
585 u
->transient_file
= safe_fclose(u
->transient_file
);
587 if (!MANAGER_IS_RELOADING(u
->manager
))
588 unit_remove_transient(u
);
590 bus_unit_send_removed_signal(u
);
594 unit_dequeue_rewatch_pids(u
);
596 sd_bus_slot_unref(u
->match_bus_slot
);
597 sd_bus_track_unref(u
->bus_track
);
598 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
600 unit_free_requires_mounts_for(u
);
602 SET_FOREACH(t
, u
->names
, i
)
603 hashmap_remove_value(u
->manager
->units
, t
, u
);
605 if (!sd_id128_is_null(u
->invocation_id
))
606 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
620 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
621 bidi_set_free(u
, u
->dependencies
[d
]);
624 manager_unref_console(u
->manager
);
626 unit_release_cgroup(u
);
628 if (!MANAGER_IS_RELOADING(u
->manager
))
629 unit_unlink_state_files(u
);
631 unit_unref_uid_gid(u
, false);
633 (void) manager_update_failed_units(u
->manager
, u
, false);
634 set_remove(u
->manager
->startup_units
, u
);
636 unit_unwatch_all_pids(u
);
638 unit_ref_unset(&u
->slice
);
639 while (u
->refs_by_target
)
640 unit_ref_unset(u
->refs_by_target
);
642 if (u
->type
!= _UNIT_TYPE_INVALID
)
643 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
645 if (u
->in_load_queue
)
646 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
648 if (u
->in_dbus_queue
)
649 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
652 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
654 if (u
->in_cgroup_realize_queue
)
655 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
657 if (u
->in_cgroup_empty_queue
)
658 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
660 if (u
->in_cleanup_queue
)
661 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
663 if (u
->in_target_deps_queue
)
664 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
666 if (u
->in_stop_when_unneeded_queue
)
667 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
669 safe_close(u
->ip_accounting_ingress_map_fd
);
670 safe_close(u
->ip_accounting_egress_map_fd
);
672 safe_close(u
->ipv4_allow_map_fd
);
673 safe_close(u
->ipv6_allow_map_fd
);
674 safe_close(u
->ipv4_deny_map_fd
);
675 safe_close(u
->ipv6_deny_map_fd
);
677 bpf_program_unref(u
->ip_bpf_ingress
);
678 bpf_program_unref(u
->ip_bpf_ingress_installed
);
679 bpf_program_unref(u
->ip_bpf_egress
);
680 bpf_program_unref(u
->ip_bpf_egress_installed
);
682 bpf_program_unref(u
->bpf_device_control_installed
);
684 condition_free_list(u
->conditions
);
685 condition_free_list(u
->asserts
);
687 free(u
->description
);
688 strv_free(u
->documentation
);
689 free(u
->fragment_path
);
690 free(u
->source_path
);
691 strv_free(u
->dropin_paths
);
694 free(u
->job_timeout_reboot_arg
);
696 set_free_free(u
->names
);
703 UnitActiveState
unit_active_state(Unit
*u
) {
706 if (u
->load_state
== UNIT_MERGED
)
707 return unit_active_state(unit_follow_merge(u
));
709 /* After a reload it might happen that a unit is not correctly
710 * loaded but still has a process around. That's why we won't
711 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
713 return UNIT_VTABLE(u
)->active_state(u
);
716 const char* unit_sub_state_to_string(Unit
*u
) {
719 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
722 static int set_complete_move(Set
**s
, Set
**other
) {
730 return set_move(*s
, *other
);
732 *s
= TAKE_PTR(*other
);
737 static int hashmap_complete_move(Hashmap
**s
, Hashmap
**other
) {
745 return hashmap_move(*s
, *other
);
747 *s
= TAKE_PTR(*other
);
752 static int merge_names(Unit
*u
, Unit
*other
) {
760 r
= set_complete_move(&u
->names
, &other
->names
);
764 set_free_free(other
->names
);
768 SET_FOREACH(t
, u
->names
, i
)
769 assert_se(hashmap_replace(u
->manager
->units
, t
, u
) == 0);
774 static int reserve_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
779 assert(d
< _UNIT_DEPENDENCY_MAX
);
782 * If u does not have this dependency set allocated, there is no need
783 * to reserve anything. In that case other's set will be transferred
784 * as a whole to u by complete_move().
786 if (!u
->dependencies
[d
])
789 /* merge_dependencies() will skip a u-on-u dependency */
790 n_reserve
= hashmap_size(other
->dependencies
[d
]) - !!hashmap_get(other
->dependencies
[d
], u
);
792 return hashmap_reserve(u
->dependencies
[d
], n_reserve
);
795 static void merge_dependencies(Unit
*u
, Unit
*other
, const char *other_id
, UnitDependency d
) {
801 /* Merges all dependencies of type 'd' of the unit 'other' into the deps of the unit 'u' */
805 assert(d
< _UNIT_DEPENDENCY_MAX
);
807 /* Fix backwards pointers. Let's iterate through all dependendent units of the other unit. */
808 HASHMAP_FOREACH_KEY(v
, back
, other
->dependencies
[d
], i
) {
811 /* Let's now iterate through the dependencies of that dependencies of the other units, looking for
812 * pointers back, and let's fix them up, to instead point to 'u'. */
814 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++) {
816 /* Do not add dependencies between u and itself. */
817 if (hashmap_remove(back
->dependencies
[k
], other
))
818 maybe_warn_about_dependency(u
, other_id
, k
);
820 UnitDependencyInfo di_u
, di_other
, di_merged
;
822 /* Let's drop this dependency between "back" and "other", and let's create it between
823 * "back" and "u" instead. Let's merge the bit masks of the dependency we are moving,
824 * and any such dependency which might already exist */
826 di_other
.data
= hashmap_get(back
->dependencies
[k
], other
);
828 continue; /* dependency isn't set, let's try the next one */
830 di_u
.data
= hashmap_get(back
->dependencies
[k
], u
);
832 di_merged
= (UnitDependencyInfo
) {
833 .origin_mask
= di_u
.origin_mask
| di_other
.origin_mask
,
834 .destination_mask
= di_u
.destination_mask
| di_other
.destination_mask
,
837 r
= hashmap_remove_and_replace(back
->dependencies
[k
], other
, u
, di_merged
.data
);
839 log_warning_errno(r
, "Failed to remove/replace: back=%s other=%s u=%s: %m", back
->id
, other_id
, u
->id
);
842 /* assert_se(hashmap_remove_and_replace(back->dependencies[k], other, u, di_merged.data) >= 0); */
848 /* Also do not move dependencies on u to itself */
849 back
= hashmap_remove(other
->dependencies
[d
], u
);
851 maybe_warn_about_dependency(u
, other_id
, d
);
853 /* The move cannot fail. The caller must have performed a reservation. */
854 assert_se(hashmap_complete_move(&u
->dependencies
[d
], &other
->dependencies
[d
]) == 0);
856 other
->dependencies
[d
] = hashmap_free(other
->dependencies
[d
]);
859 int unit_merge(Unit
*u
, Unit
*other
) {
861 const char *other_id
= NULL
;
866 assert(u
->manager
== other
->manager
);
867 assert(u
->type
!= _UNIT_TYPE_INVALID
);
869 other
= unit_follow_merge(other
);
874 if (u
->type
!= other
->type
)
877 if (!u
->instance
!= !other
->instance
)
880 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
883 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
892 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
896 other_id
= strdupa(other
->id
);
898 /* Make reservations to ensure merge_dependencies() won't fail */
899 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
900 r
= reserve_dependencies(u
, other
, d
);
902 * We don't rollback reservations if we fail. We don't have
903 * a way to undo reservations. A reservation is not a leak.
910 r
= merge_names(u
, other
);
914 /* Redirect all references */
915 while (other
->refs_by_target
)
916 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
918 /* Merge dependencies */
919 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
920 merge_dependencies(u
, other
, other_id
, d
);
922 other
->load_state
= UNIT_MERGED
;
923 other
->merged_into
= u
;
925 /* If there is still some data attached to the other node, we
926 * don't need it anymore, and can free it. */
927 if (other
->load_state
!= UNIT_STUB
)
928 if (UNIT_VTABLE(other
)->done
)
929 UNIT_VTABLE(other
)->done(other
);
931 unit_add_to_dbus_queue(u
);
932 unit_add_to_cleanup_queue(other
);
937 int unit_merge_by_name(Unit
*u
, const char *name
) {
938 _cleanup_free_
char *s
= NULL
;
945 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
949 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
956 other
= manager_get_unit(u
->manager
, name
);
958 return unit_merge(u
, other
);
960 return unit_add_name(u
, name
);
963 Unit
* unit_follow_merge(Unit
*u
) {
966 while (u
->load_state
== UNIT_MERGED
)
967 assert_se(u
= u
->merged_into
);
972 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
973 ExecDirectoryType dt
;
980 if (c
->working_directory
&& !c
->working_directory_missing_ok
) {
981 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
986 if (c
->root_directory
) {
987 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
993 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
998 for (dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
999 if (!u
->manager
->prefix
[dt
])
1002 STRV_FOREACH(dp
, c
->directories
[dt
].paths
) {
1003 _cleanup_free_
char *p
;
1005 p
= strjoin(u
->manager
->prefix
[dt
], "/", *dp
);
1009 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1015 if (!MANAGER_IS_SYSTEM(u
->manager
))
1018 if (c
->private_tmp
) {
1021 FOREACH_STRING(p
, "/tmp", "/var/tmp") {
1022 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1027 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1032 if (!IN_SET(c
->std_output
,
1033 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1034 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
1035 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
) &&
1036 !IN_SET(c
->std_error
,
1037 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1038 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
1039 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
))
1042 /* If syslog or kernel logging is requested, make sure our own
1043 * logging daemon is run first. */
1045 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1052 const char *unit_description(Unit
*u
) {
1056 return u
->description
;
1058 return strna(u
->id
);
1061 static void print_unit_dependency_mask(FILE *f
, const char *kind
, UnitDependencyMask mask
, bool *space
) {
1063 UnitDependencyMask mask
;
1066 { UNIT_DEPENDENCY_FILE
, "file" },
1067 { UNIT_DEPENDENCY_IMPLICIT
, "implicit" },
1068 { UNIT_DEPENDENCY_DEFAULT
, "default" },
1069 { UNIT_DEPENDENCY_UDEV
, "udev" },
1070 { UNIT_DEPENDENCY_PATH
, "path" },
1071 { UNIT_DEPENDENCY_MOUNTINFO_IMPLICIT
, "mountinfo-implicit" },
1072 { UNIT_DEPENDENCY_MOUNTINFO_DEFAULT
, "mountinfo-default" },
1073 { UNIT_DEPENDENCY_PROC_SWAP
, "proc-swap" },
1081 for (i
= 0; i
< ELEMENTSOF(table
); i
++) {
1086 if (FLAGS_SET(mask
, table
[i
].mask
)) {
1094 fputs(table
[i
].name
, f
);
1096 mask
&= ~table
[i
].mask
;
1103 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
1107 const char *prefix2
;
1109 timestamp0
[FORMAT_TIMESTAMP_MAX
],
1110 timestamp1
[FORMAT_TIMESTAMP_MAX
],
1111 timestamp2
[FORMAT_TIMESTAMP_MAX
],
1112 timestamp3
[FORMAT_TIMESTAMP_MAX
],
1113 timestamp4
[FORMAT_TIMESTAMP_MAX
],
1114 timespan
[FORMAT_TIMESPAN_MAX
];
1116 _cleanup_set_free_ Set
*following_set
= NULL
;
1122 assert(u
->type
>= 0);
1124 prefix
= strempty(prefix
);
1125 prefix2
= strjoina(prefix
, "\t");
1129 "%s\tDescription: %s\n"
1130 "%s\tInstance: %s\n"
1131 "%s\tUnit Load State: %s\n"
1132 "%s\tUnit Active State: %s\n"
1133 "%s\tState Change Timestamp: %s\n"
1134 "%s\tInactive Exit Timestamp: %s\n"
1135 "%s\tActive Enter Timestamp: %s\n"
1136 "%s\tActive Exit Timestamp: %s\n"
1137 "%s\tInactive Enter Timestamp: %s\n"
1139 "%s\tNeed Daemon Reload: %s\n"
1140 "%s\tTransient: %s\n"
1141 "%s\tPerpetual: %s\n"
1142 "%s\tGarbage Collection Mode: %s\n"
1145 "%s\tCGroup realized: %s\n",
1147 prefix
, unit_description(u
),
1148 prefix
, strna(u
->instance
),
1149 prefix
, unit_load_state_to_string(u
->load_state
),
1150 prefix
, unit_active_state_to_string(unit_active_state(u
)),
1151 prefix
, strna(format_timestamp(timestamp0
, sizeof(timestamp0
), u
->state_change_timestamp
.realtime
)),
1152 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->inactive_exit_timestamp
.realtime
)),
1153 prefix
, strna(format_timestamp(timestamp2
, sizeof(timestamp2
), u
->active_enter_timestamp
.realtime
)),
1154 prefix
, strna(format_timestamp(timestamp3
, sizeof(timestamp3
), u
->active_exit_timestamp
.realtime
)),
1155 prefix
, strna(format_timestamp(timestamp4
, sizeof(timestamp4
), u
->inactive_enter_timestamp
.realtime
)),
1156 prefix
, yes_no(unit_may_gc(u
)),
1157 prefix
, yes_no(unit_need_daemon_reload(u
)),
1158 prefix
, yes_no(u
->transient
),
1159 prefix
, yes_no(u
->perpetual
),
1160 prefix
, collect_mode_to_string(u
->collect_mode
),
1161 prefix
, strna(unit_slice_name(u
)),
1162 prefix
, strna(u
->cgroup_path
),
1163 prefix
, yes_no(u
->cgroup_realized
));
1165 if (u
->cgroup_realized_mask
!= 0) {
1166 _cleanup_free_
char *s
= NULL
;
1167 (void) cg_mask_to_string(u
->cgroup_realized_mask
, &s
);
1168 fprintf(f
, "%s\tCGroup realized mask: %s\n", prefix
, strnull(s
));
1171 if (u
->cgroup_enabled_mask
!= 0) {
1172 _cleanup_free_
char *s
= NULL
;
1173 (void) cg_mask_to_string(u
->cgroup_enabled_mask
, &s
);
1174 fprintf(f
, "%s\tCGroup enabled mask: %s\n", prefix
, strnull(s
));
1177 m
= unit_get_own_mask(u
);
1179 _cleanup_free_
char *s
= NULL
;
1180 (void) cg_mask_to_string(m
, &s
);
1181 fprintf(f
, "%s\tCGroup own mask: %s\n", prefix
, strnull(s
));
1184 m
= unit_get_members_mask(u
);
1186 _cleanup_free_
char *s
= NULL
;
1187 (void) cg_mask_to_string(m
, &s
);
1188 fprintf(f
, "%s\tCGroup members mask: %s\n", prefix
, strnull(s
));
1191 m
= unit_get_delegate_mask(u
);
1193 _cleanup_free_
char *s
= NULL
;
1194 (void) cg_mask_to_string(m
, &s
);
1195 fprintf(f
, "%s\tCGroup delegate mask: %s\n", prefix
, strnull(s
));
1198 SET_FOREACH(t
, u
->names
, i
)
1199 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
1201 if (!sd_id128_is_null(u
->invocation_id
))
1202 fprintf(f
, "%s\tInvocation ID: " SD_ID128_FORMAT_STR
"\n",
1203 prefix
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
1205 STRV_FOREACH(j
, u
->documentation
)
1206 fprintf(f
, "%s\tDocumentation: %s\n", prefix
, *j
);
1208 following
= unit_following(u
);
1210 fprintf(f
, "%s\tFollowing: %s\n", prefix
, following
->id
);
1212 r
= unit_following_set(u
, &following_set
);
1216 SET_FOREACH(other
, following_set
, i
)
1217 fprintf(f
, "%s\tFollowing Set Member: %s\n", prefix
, other
->id
);
1220 if (u
->fragment_path
)
1221 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->fragment_path
);
1224 fprintf(f
, "%s\tSource Path: %s\n", prefix
, u
->source_path
);
1226 STRV_FOREACH(j
, u
->dropin_paths
)
1227 fprintf(f
, "%s\tDropIn Path: %s\n", prefix
, *j
);
1229 if (u
->failure_action
!= EMERGENCY_ACTION_NONE
)
1230 fprintf(f
, "%s\tFailure Action: %s\n", prefix
, emergency_action_to_string(u
->failure_action
));
1231 if (u
->failure_action_exit_status
>= 0)
1232 fprintf(f
, "%s\tFailure Action Exit Status: %i\n", prefix
, u
->failure_action_exit_status
);
1233 if (u
->success_action
!= EMERGENCY_ACTION_NONE
)
1234 fprintf(f
, "%s\tSuccess Action: %s\n", prefix
, emergency_action_to_string(u
->success_action
));
1235 if (u
->success_action_exit_status
>= 0)
1236 fprintf(f
, "%s\tSuccess Action Exit Status: %i\n", prefix
, u
->success_action_exit_status
);
1238 if (u
->job_timeout
!= USEC_INFINITY
)
1239 fprintf(f
, "%s\tJob Timeout: %s\n", prefix
, format_timespan(timespan
, sizeof(timespan
), u
->job_timeout
, 0));
1241 if (u
->job_timeout_action
!= EMERGENCY_ACTION_NONE
)
1242 fprintf(f
, "%s\tJob Timeout Action: %s\n", prefix
, emergency_action_to_string(u
->job_timeout_action
));
1244 if (u
->job_timeout_reboot_arg
)
1245 fprintf(f
, "%s\tJob Timeout Reboot Argument: %s\n", prefix
, u
->job_timeout_reboot_arg
);
1247 condition_dump_list(u
->conditions
, f
, prefix
, condition_type_to_string
);
1248 condition_dump_list(u
->asserts
, f
, prefix
, assert_type_to_string
);
1250 if (dual_timestamp_is_set(&u
->condition_timestamp
))
1252 "%s\tCondition Timestamp: %s\n"
1253 "%s\tCondition Result: %s\n",
1254 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->condition_timestamp
.realtime
)),
1255 prefix
, yes_no(u
->condition_result
));
1257 if (dual_timestamp_is_set(&u
->assert_timestamp
))
1259 "%s\tAssert Timestamp: %s\n"
1260 "%s\tAssert Result: %s\n",
1261 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->assert_timestamp
.realtime
)),
1262 prefix
, yes_no(u
->assert_result
));
1264 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
1265 UnitDependencyInfo di
;
1268 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
], i
) {
1271 fprintf(f
, "%s\t%s: %s (", prefix
, unit_dependency_to_string(d
), other
->id
);
1273 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1274 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1280 if (!hashmap_isempty(u
->requires_mounts_for
)) {
1281 UnitDependencyInfo di
;
1284 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
, i
) {
1287 fprintf(f
, "%s\tRequiresMountsFor: %s (", prefix
, path
);
1289 print_unit_dependency_mask(f
, "origin", di
.origin_mask
, &space
);
1290 print_unit_dependency_mask(f
, "destination", di
.destination_mask
, &space
);
1296 if (u
->load_state
== UNIT_LOADED
) {
1299 "%s\tStopWhenUnneeded: %s\n"
1300 "%s\tRefuseManualStart: %s\n"
1301 "%s\tRefuseManualStop: %s\n"
1302 "%s\tDefaultDependencies: %s\n"
1303 "%s\tOnFailureJobMode: %s\n"
1304 "%s\tIgnoreOnIsolate: %s\n",
1305 prefix
, yes_no(u
->stop_when_unneeded
),
1306 prefix
, yes_no(u
->refuse_manual_start
),
1307 prefix
, yes_no(u
->refuse_manual_stop
),
1308 prefix
, yes_no(u
->default_dependencies
),
1309 prefix
, job_mode_to_string(u
->on_failure_job_mode
),
1310 prefix
, yes_no(u
->ignore_on_isolate
));
1312 if (UNIT_VTABLE(u
)->dump
)
1313 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
1315 } else if (u
->load_state
== UNIT_MERGED
)
1317 "%s\tMerged into: %s\n",
1318 prefix
, u
->merged_into
->id
);
1319 else if (u
->load_state
== UNIT_ERROR
)
1320 fprintf(f
, "%s\tLoad Error Code: %s\n", prefix
, strerror(-u
->load_error
));
1322 for (n
= sd_bus_track_first(u
->bus_track
); n
; n
= sd_bus_track_next(u
->bus_track
))
1323 fprintf(f
, "%s\tBus Ref: %s\n", prefix
, n
);
1326 job_dump(u
->job
, f
, prefix2
);
1329 job_dump(u
->nop_job
, f
, prefix2
);
1332 /* Common implementation for multiple backends */
1333 int unit_load_fragment_and_dropin(Unit
*u
) {
1338 /* Load a .{service,socket,...} file */
1339 r
= unit_load_fragment(u
);
1343 if (u
->load_state
== UNIT_STUB
)
1346 /* Load drop-in directory data. If u is an alias, we might be reloading the
1347 * target unit needlessly. But we cannot be sure which drops-ins have already
1348 * been loaded and which not, at least without doing complicated book-keeping,
1349 * so let's always reread all drop-ins. */
1350 return unit_load_dropin(unit_follow_merge(u
));
1353 /* Common implementation for multiple backends */
1354 int unit_load_fragment_and_dropin_optional(Unit
*u
) {
1359 /* Same as unit_load_fragment_and_dropin(), but whether
1360 * something can be loaded or not doesn't matter. */
1362 /* Load a .service/.socket/.slice/… file */
1363 r
= unit_load_fragment(u
);
1367 if (u
->load_state
== UNIT_STUB
)
1368 u
->load_state
= UNIT_LOADED
;
1370 /* Load drop-in directory data */
1371 return unit_load_dropin(unit_follow_merge(u
));
1374 void unit_add_to_target_deps_queue(Unit
*u
) {
1375 Manager
*m
= u
->manager
;
1379 if (u
->in_target_deps_queue
)
1382 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1383 u
->in_target_deps_queue
= true;
1386 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1390 if (target
->type
!= UNIT_TARGET
)
1393 /* Only add the dependency if both units are loaded, so that
1394 * that loop check below is reliable */
1395 if (u
->load_state
!= UNIT_LOADED
||
1396 target
->load_state
!= UNIT_LOADED
)
1399 /* If either side wants no automatic dependencies, then let's
1401 if (!u
->default_dependencies
||
1402 !target
->default_dependencies
)
1405 /* Don't create loops */
1406 if (hashmap_get(target
->dependencies
[UNIT_BEFORE
], u
))
1409 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1412 static int unit_add_slice_dependencies(Unit
*u
) {
1413 UnitDependencyMask mask
;
1416 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1419 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1420 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1422 mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1424 if (UNIT_ISSET(u
->slice
))
1425 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, UNIT_DEREF(u
->slice
), true, mask
);
1427 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1430 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1433 static int unit_add_mount_dependencies(Unit
*u
) {
1434 UnitDependencyInfo di
;
1441 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
, i
) {
1442 char prefix
[strlen(path
) + 1];
1444 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1445 _cleanup_free_
char *p
= NULL
;
1448 r
= unit_name_from_path(prefix
, ".mount", &p
);
1452 m
= manager_get_unit(u
->manager
, p
);
1454 /* Make sure to load the mount unit if
1455 * it exists. If so the dependencies
1456 * on this unit will be added later
1457 * during the loading of the mount
1459 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1465 if (m
->load_state
!= UNIT_LOADED
)
1468 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1472 if (m
->fragment_path
) {
1473 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1483 static int unit_add_startup_units(Unit
*u
) {
1487 c
= unit_get_cgroup_context(u
);
1491 if (c
->startup_cpu_shares
== CGROUP_CPU_SHARES_INVALID
&&
1492 c
->startup_io_weight
== CGROUP_WEIGHT_INVALID
&&
1493 c
->startup_blockio_weight
== CGROUP_BLKIO_WEIGHT_INVALID
)
1496 r
= set_ensure_allocated(&u
->manager
->startup_units
, NULL
);
1500 return set_put(u
->manager
->startup_units
, u
);
1503 int unit_load(Unit
*u
) {
1508 if (u
->in_load_queue
) {
1509 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1510 u
->in_load_queue
= false;
1513 if (u
->type
== _UNIT_TYPE_INVALID
)
1516 if (u
->load_state
!= UNIT_STUB
)
1519 if (u
->transient_file
) {
1520 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1521 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1523 r
= fflush_and_check(u
->transient_file
);
1527 u
->transient_file
= safe_fclose(u
->transient_file
);
1528 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1531 if (UNIT_VTABLE(u
)->load
) {
1532 r
= UNIT_VTABLE(u
)->load(u
);
1537 if (u
->load_state
== UNIT_STUB
) {
1542 if (u
->load_state
== UNIT_LOADED
) {
1543 unit_add_to_target_deps_queue(u
);
1545 r
= unit_add_slice_dependencies(u
);
1549 r
= unit_add_mount_dependencies(u
);
1553 r
= unit_add_startup_units(u
);
1557 if (u
->on_failure_job_mode
== JOB_ISOLATE
&& hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) > 1) {
1558 log_unit_error(u
, "More than one OnFailure= dependencies specified but OnFailureJobMode=isolate set. Refusing.");
1563 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1564 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1566 /* We finished loading, let's ensure our parents recalculate the members mask */
1567 unit_invalidate_cgroup_members_masks(u
);
1570 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1572 unit_add_to_dbus_queue(unit_follow_merge(u
));
1573 unit_add_to_gc_queue(u
);
1578 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code should hence
1579 * return ENOEXEC to ensure units are placed in this state after loading */
1581 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1582 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1586 unit_add_to_dbus_queue(u
);
1587 unit_add_to_gc_queue(u
);
1589 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1593 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1598 va_start(ap
, format
);
1600 r
= log_object_internalv(level
, error
, file
, line
, func
,
1601 u
->manager
->unit_log_field
,
1603 u
->manager
->invocation_log_field
,
1604 u
->invocation_id_string
,
1607 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1613 static bool unit_test_condition(Unit
*u
) {
1616 dual_timestamp_get(&u
->condition_timestamp
);
1617 u
->condition_result
= condition_test_list(u
->conditions
, condition_type_to_string
, log_unit_internal
, u
);
1619 unit_add_to_dbus_queue(u
);
1621 return u
->condition_result
;
1624 static bool unit_test_assert(Unit
*u
) {
1627 dual_timestamp_get(&u
->assert_timestamp
);
1628 u
->assert_result
= condition_test_list(u
->asserts
, assert_type_to_string
, log_unit_internal
, u
);
1630 unit_add_to_dbus_queue(u
);
1632 return u
->assert_result
;
1635 void unit_status_printf(Unit
*u
, const char *status
, const char *unit_status_msg_format
) {
1638 d
= unit_description(u
);
1639 if (log_get_show_color())
1640 d
= strjoina(ANSI_HIGHLIGHT
, d
, ANSI_NORMAL
);
1642 DISABLE_WARNING_FORMAT_NONLITERAL
;
1643 manager_status_printf(u
->manager
, STATUS_TYPE_NORMAL
, status
, unit_status_msg_format
, d
);
1647 int unit_test_start_limit(Unit
*u
) {
1652 if (ratelimit_below(&u
->start_limit
)) {
1653 u
->start_limit_hit
= false;
1657 log_unit_warning(u
, "Start request repeated too quickly.");
1658 u
->start_limit_hit
= true;
1660 reason
= strjoina("unit ", u
->id
, " failed");
1662 emergency_action(u
->manager
, u
->start_limit_action
,
1663 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1664 u
->reboot_arg
, -1, reason
);
1669 bool unit_shall_confirm_spawn(Unit
*u
) {
1672 if (manager_is_confirm_spawn_disabled(u
->manager
))
1675 /* For some reasons units remaining in the same process group
1676 * as PID 1 fail to acquire the console even if it's not used
1677 * by any process. So skip the confirmation question for them. */
1678 return !unit_get_exec_context(u
)->same_pgrp
;
1681 static bool unit_verify_deps(Unit
*u
) {
1688 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined with
1689 * After=. We do not check Requires= or Requisite= here as they only should have an effect on the job
1690 * processing, but do not have any effect afterwards. We don't check BindsTo= dependencies that are not used in
1691 * conjunction with After= as for them any such check would make things entirely racy. */
1693 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], j
) {
1695 if (!hashmap_contains(u
->dependencies
[UNIT_AFTER
], other
))
1698 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1699 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1707 /* Errors that aren't really errors:
1708 * -EALREADY: Unit is already started.
1709 * -ECOMM: Condition failed
1710 * -EAGAIN: An operation is already in progress. Retry later.
1712 * Errors that are real errors:
1713 * -EBADR: This unit type does not support starting.
1714 * -ECANCELED: Start limit hit, too many requests for now
1715 * -EPROTO: Assert failed
1716 * -EINVAL: Unit not loaded
1717 * -EOPNOTSUPP: Unit type not supported
1718 * -ENOLINK: The necessary dependencies are not fulfilled.
1719 * -ESTALE: This unit has been started before and can't be started a second time
1720 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1722 int unit_start(Unit
*u
) {
1723 UnitActiveState state
;
1729 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1730 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1731 * waiting is finished. */
1732 state
= unit_active_state(u
);
1733 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1736 /* Units that aren't loaded cannot be started */
1737 if (u
->load_state
!= UNIT_LOADED
)
1740 /* Refuse starting scope units more than once */
1741 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1744 /* If the conditions failed, don't do anything at all. If we already are activating this call might
1745 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1746 * recheck the condition in that case. */
1747 if (state
!= UNIT_ACTIVATING
&&
1748 !unit_test_condition(u
)) {
1750 /* Let's also check the start limit here. Normally, the start limit is only checked by the
1751 * .start() method of the unit type after it did some additional checks verifying everything
1752 * is in order (so that those other checks can propagate errors properly). However, if a
1753 * condition check doesn't hold we don't get that far but we should still ensure we are not
1754 * called in a tight loop without a rate limit check enforced, hence do the check here. Note
1755 * that ECOMM is generally not a reason for a job to fail, unlike most other errors here,
1756 * hence the chance is big that any triggering unit for us will trigger us again. Note this
1757 * condition check is a bit different from the condition check inside the per-unit .start()
1758 * function, as this one will not change the unit's state in any way (and we shouldn't here,
1759 * after all the condition failed). */
1761 r
= unit_test_start_limit(u
);
1765 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition failed. Not starting unit.");
1768 /* If the asserts failed, fail the entire job */
1769 if (state
!= UNIT_ACTIVATING
&&
1770 !unit_test_assert(u
))
1771 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1773 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1774 * condition checks, so that we rather return condition check errors (which are usually not
1775 * considered a true failure) than "not supported" errors (which are considered a failure).
1777 if (!unit_supported(u
))
1780 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1781 * should have taken care of this already, but let's check this here again. After all, our
1782 * dependencies might not be in effect anymore, due to a reload or due to a failed condition. */
1783 if (!unit_verify_deps(u
))
1786 /* Forward to the main object, if we aren't it. */
1787 following
= unit_following(u
);
1789 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1790 return unit_start(following
);
1793 /* If it is stopped, but we cannot start it, then fail */
1794 if (!UNIT_VTABLE(u
)->start
)
1797 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1798 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1799 * waits for a holdoff timer to elapse before it will start again. */
1801 unit_add_to_dbus_queue(u
);
1803 return UNIT_VTABLE(u
)->start(u
);
1806 bool unit_can_start(Unit
*u
) {
1809 if (u
->load_state
!= UNIT_LOADED
)
1812 if (!unit_supported(u
))
1815 /* Scope units may be started only once */
1816 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
1819 return !!UNIT_VTABLE(u
)->start
;
1822 bool unit_can_isolate(Unit
*u
) {
1825 return unit_can_start(u
) &&
1830 * -EBADR: This unit type does not support stopping.
1831 * -EALREADY: Unit is already stopped.
1832 * -EAGAIN: An operation is already in progress. Retry later.
1834 int unit_stop(Unit
*u
) {
1835 UnitActiveState state
;
1840 state
= unit_active_state(u
);
1841 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1844 following
= unit_following(u
);
1846 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1847 return unit_stop(following
);
1850 if (!UNIT_VTABLE(u
)->stop
)
1853 unit_add_to_dbus_queue(u
);
1855 return UNIT_VTABLE(u
)->stop(u
);
1858 bool unit_can_stop(Unit
*u
) {
1861 if (!unit_supported(u
))
1867 return !!UNIT_VTABLE(u
)->stop
;
1871 * -EBADR: This unit type does not support reloading.
1872 * -ENOEXEC: Unit is not started.
1873 * -EAGAIN: An operation is already in progress. Retry later.
1875 int unit_reload(Unit
*u
) {
1876 UnitActiveState state
;
1881 if (u
->load_state
!= UNIT_LOADED
)
1884 if (!unit_can_reload(u
))
1887 state
= unit_active_state(u
);
1888 if (state
== UNIT_RELOADING
)
1891 if (state
!= UNIT_ACTIVE
) {
1892 log_unit_warning(u
, "Unit cannot be reloaded because it is inactive.");
1896 following
= unit_following(u
);
1898 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
1899 return unit_reload(following
);
1902 unit_add_to_dbus_queue(u
);
1904 if (!UNIT_VTABLE(u
)->reload
) {
1905 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
1906 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), 0);
1910 return UNIT_VTABLE(u
)->reload(u
);
1913 bool unit_can_reload(Unit
*u
) {
1916 if (UNIT_VTABLE(u
)->can_reload
)
1917 return UNIT_VTABLE(u
)->can_reload(u
);
1919 if (!hashmap_isempty(u
->dependencies
[UNIT_PROPAGATES_RELOAD_TO
]))
1922 return UNIT_VTABLE(u
)->reload
;
1925 bool unit_is_unneeded(Unit
*u
) {
1926 static const UnitDependency deps
[] = {
1936 if (!u
->stop_when_unneeded
)
1939 /* Don't clean up while the unit is transitioning or is even inactive. */
1940 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
1945 for (j
= 0; j
< ELEMENTSOF(deps
); j
++) {
1950 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
1951 * restart, then don't clean this one up. */
1953 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[deps
[j
]], i
) {
1957 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1960 if (unit_will_restart(other
))
1968 static void check_unneeded_dependencies(Unit
*u
) {
1970 static const UnitDependency deps
[] = {
1980 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
1982 for (j
= 0; j
< ELEMENTSOF(deps
); j
++) {
1987 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[deps
[j
]], i
)
1988 unit_submit_to_stop_when_unneeded_queue(other
);
1992 static void unit_check_binds_to(Unit
*u
) {
1993 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2005 if (unit_active_state(u
) != UNIT_ACTIVE
)
2008 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
) {
2012 if (!other
->coldplugged
)
2013 /* We might yet create a job for the other unit… */
2016 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2026 /* If stopping a unit fails continuously we might enter a stop
2027 * loop here, hence stop acting on the service being
2028 * unnecessary after a while. */
2029 if (!ratelimit_below(&u
->auto_stop_ratelimit
)) {
2030 log_unit_warning(u
, "Unit is bound to inactive unit %s, but not stopping since we tried this too often recently.", other
->id
);
2035 log_unit_info(u
, "Unit is bound to inactive unit %s. Stopping, too.", other
->id
);
2037 /* A unit we need to run is gone. Sniff. Let's stop this. */
2038 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, NULL
, &error
, NULL
);
2040 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
2043 static void retroactively_start_dependencies(Unit
*u
) {
2049 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2051 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUIRES
], i
)
2052 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2053 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2054 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2056 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
)
2057 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2058 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2059 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2061 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_WANTS
], i
)
2062 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2063 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2064 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2066 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTS
], i
)
2067 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2068 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2070 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTED_BY
], i
)
2071 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2072 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2075 static void retroactively_stop_dependencies(Unit
*u
) {
2081 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2083 /* Pull down units which are bound to us recursively if enabled */
2084 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BOUND_BY
], i
)
2085 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2086 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2089 void unit_start_on_failure(Unit
*u
) {
2097 if (hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) <= 0)
2100 log_unit_info(u
, "Triggering OnFailure= dependencies.");
2102 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_ON_FAILURE
], i
) {
2103 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2105 r
= manager_add_job(u
->manager
, JOB_START
, other
, u
->on_failure_job_mode
, NULL
, &error
, NULL
);
2107 log_unit_warning_errno(u
, r
, "Failed to enqueue OnFailure= job, ignoring: %s", bus_error_message(&error
, r
));
2111 void unit_trigger_notify(Unit
*u
) {
2118 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_TRIGGERED_BY
], i
)
2119 if (UNIT_VTABLE(other
)->trigger_notify
)
2120 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2123 static int unit_log_resources(Unit
*u
) {
2124 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ 4];
2125 bool any_traffic
= false, have_ip_accounting
= false;
2126 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
;
2127 size_t n_message_parts
= 0, n_iovec
= 0;
2128 char* message_parts
[3 + 1], *t
;
2129 nsec_t nsec
= NSEC_INFINITY
;
2130 CGroupIPAccountingMetric m
;
2133 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2134 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2135 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2136 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2137 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2142 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2143 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2144 * information and the complete data in structured fields. */
2146 (void) unit_get_cpu_usage(u
, &nsec
);
2147 if (nsec
!= NSEC_INFINITY
) {
2148 char buf
[FORMAT_TIMESPAN_MAX
] = "";
2150 /* Format the CPU time for inclusion in the structured log message */
2151 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2155 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2157 /* Format the CPU time for inclusion in the human language message string */
2158 format_timespan(buf
, sizeof(buf
), nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
);
2159 t
= strjoin("consumed ", buf
, " CPU time");
2165 message_parts
[n_message_parts
++] = t
;
2168 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2169 char buf
[FORMAT_BYTES_MAX
] = "";
2170 uint64_t value
= UINT64_MAX
;
2172 assert(ip_fields
[m
]);
2174 (void) unit_get_ip_accounting(u
, m
, &value
);
2175 if (value
== UINT64_MAX
)
2178 have_ip_accounting
= true;
2182 /* Format IP accounting data for inclusion in the structured log message */
2183 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2187 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2189 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2190 * bytes counters (and not for the packets counters) */
2191 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2193 igress
= strjoin("received ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2198 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2200 egress
= strjoin("sent ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2208 if (have_ip_accounting
) {
2211 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2213 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2218 k
= strdup("no IP traffic");
2224 message_parts
[n_message_parts
++] = k
;
2228 /* Is there any accounting data available at all? */
2234 if (n_message_parts
== 0)
2235 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2237 _cleanup_free_
char *joined
;
2239 message_parts
[n_message_parts
] = NULL
;
2241 joined
= strv_join(message_parts
, ", ");
2247 joined
[0] = ascii_toupper(joined
[0]);
2248 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2251 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2252 * and hence don't increase n_iovec for them */
2253 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2254 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2256 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2257 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2259 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2260 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2262 log_struct_iovec(LOG_INFO
, iovec
, n_iovec
+ 4);
2266 for (i
= 0; i
< n_message_parts
; i
++)
2267 free(message_parts
[i
]);
2269 for (i
= 0; i
< n_iovec
; i
++)
2270 free(iovec
[i
].iov_base
);
2276 static void unit_update_on_console(Unit
*u
) {
2281 b
= unit_needs_console(u
);
2282 if (u
->on_console
== b
)
2287 manager_ref_console(u
->manager
);
2289 manager_unref_console(u
->manager
);
2292 static void unit_emit_audit_start(Unit
*u
) {
2295 if (u
->type
!= UNIT_SERVICE
)
2298 /* Write audit record if we have just finished starting up */
2299 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2303 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2306 if (u
->type
!= UNIT_SERVICE
)
2310 /* Write audit record if we have just finished shutting down */
2311 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2312 u
->in_audit
= false;
2314 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2315 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2317 if (state
== UNIT_INACTIVE
)
2318 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2322 static bool unit_process_job(Job
*j
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2323 bool unexpected
= false;
2327 if (j
->state
== JOB_WAITING
)
2329 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2331 job_add_to_run_queue(j
);
2333 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2334 * hence needs to invalidate jobs. */
2339 case JOB_VERIFY_ACTIVE
:
2341 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2342 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2343 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2346 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2347 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2353 case JOB_RELOAD_OR_START
:
2354 case JOB_TRY_RELOAD
:
2356 if (j
->state
== JOB_RUNNING
) {
2357 if (ns
== UNIT_ACTIVE
)
2358 job_finish_and_invalidate(j
, (flags
& UNIT_NOTIFY_RELOAD_FAILURE
) ? JOB_FAILED
: JOB_DONE
, true, false);
2359 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2362 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2363 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2371 case JOB_TRY_RESTART
:
2373 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2374 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2375 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2377 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2383 assert_not_reached("Job type unknown");
2389 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2394 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2395 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2397 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2398 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2399 * remounted this function will be called too! */
2403 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2404 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2405 unit_add_to_dbus_queue(u
);
2407 /* Update timestamps for state changes */
2408 if (!MANAGER_IS_RELOADING(m
)) {
2409 dual_timestamp_get(&u
->state_change_timestamp
);
2411 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2412 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2413 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2414 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2416 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2417 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2418 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2419 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2422 /* Keep track of failed units */
2423 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2425 /* Make sure the cgroup and state files are always removed when we become inactive */
2426 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2427 unit_prune_cgroup(u
);
2428 unit_unlink_state_files(u
);
2431 unit_update_on_console(u
);
2433 if (!MANAGER_IS_RELOADING(m
)) {
2436 /* Let's propagate state changes to the job */
2438 unexpected
= unit_process_job(u
->job
, ns
, flags
);
2442 /* If this state change happened without being requested by a job, then let's retroactively start or
2443 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2444 * additional jobs just because something is already activated. */
2447 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2448 retroactively_start_dependencies(u
);
2449 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2450 retroactively_stop_dependencies(u
);
2453 /* stop unneeded units regardless if going down was expected or not */
2454 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2455 check_unneeded_dependencies(u
);
2457 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2458 log_unit_debug(u
, "Unit entered failed state.");
2460 if (!(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2461 unit_start_on_failure(u
);
2464 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2465 /* This unit just finished starting up */
2467 unit_emit_audit_start(u
);
2468 manager_send_unit_plymouth(m
, u
);
2471 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2472 /* This unit just stopped/failed. */
2474 unit_emit_audit_stop(u
, ns
);
2475 unit_log_resources(u
);
2479 manager_recheck_journal(m
);
2480 manager_recheck_dbus(m
);
2482 unit_trigger_notify(u
);
2484 if (!MANAGER_IS_RELOADING(m
)) {
2485 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2486 unit_submit_to_stop_when_unneeded_queue(u
);
2488 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens when
2489 * something BindsTo= to a Type=oneshot unit, as these units go directly from starting to inactive,
2490 * without ever entering started.) */
2491 unit_check_binds_to(u
);
2493 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2494 reason
= strjoina("unit ", u
->id
, " failed");
2495 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2496 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2497 reason
= strjoina("unit ", u
->id
, " succeeded");
2498 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2502 unit_add_to_gc_queue(u
);
2505 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2509 assert(pid_is_valid(pid
));
2511 /* Watch a specific PID */
2513 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2514 * opportunity to remove any stalled references to this PID as they can be created
2515 * easily (when watching a process which is not our direct child). */
2517 manager_unwatch_pid(u
->manager
, pid
);
2519 r
= set_ensure_allocated(&u
->pids
, NULL
);
2523 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2527 /* First try, let's add the unit keyed by "pid". */
2528 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2534 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2535 * to an array of Units rather than just a Unit), lists us already. */
2537 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2539 for (; array
[n
]; n
++)
2543 if (found
) /* Found it already? if so, do nothing */
2548 /* Allocate a new array */
2549 new_array
= new(Unit
*, n
+ 2);
2553 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2555 new_array
[n
+1] = NULL
;
2557 /* Add or replace the old array */
2558 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2569 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2576 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2580 assert(pid_is_valid(pid
));
2582 /* First let's drop the unit in case it's keyed as "pid". */
2583 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2585 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2586 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2590 /* Let's iterate through the array, dropping our own entry */
2591 for (n
= 0; array
[n
]; n
++)
2593 array
[m
++] = array
[n
];
2597 /* The array is now empty, remove the entire entry */
2598 assert(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2603 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2606 void unit_unwatch_all_pids(Unit
*u
) {
2609 while (!set_isempty(u
->pids
))
2610 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2612 u
->pids
= set_free(u
->pids
);
2615 static void unit_tidy_watch_pids(Unit
*u
) {
2616 pid_t except1
, except2
;
2622 /* Cleans dead PIDs from our list */
2624 except1
= unit_main_pid(u
);
2625 except2
= unit_control_pid(u
);
2627 SET_FOREACH(e
, u
->pids
, i
) {
2628 pid_t pid
= PTR_TO_PID(e
);
2630 if (pid
== except1
|| pid
== except2
)
2633 if (!pid_is_unwaited(pid
))
2634 unit_unwatch_pid(u
, pid
);
2638 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2644 unit_tidy_watch_pids(u
);
2645 unit_watch_all_pids(u
);
2647 /* If the PID set is empty now, then let's finish this off. */
2648 unit_synthesize_cgroup_empty_event(u
);
2653 int unit_enqueue_rewatch_pids(Unit
*u
) {
2658 if (!u
->cgroup_path
)
2661 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2664 if (r
> 0) /* On unified we can use proper notifications */
2667 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2668 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2669 * involves issuing kill(pid, 0) on all processes we watch. */
2671 if (!u
->rewatch_pids_event_source
) {
2672 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2674 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2676 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2678 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2680 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: m");
2682 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2684 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2687 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2689 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2694 void unit_dequeue_rewatch_pids(Unit
*u
) {
2698 if (!u
->rewatch_pids_event_source
)
2701 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
2703 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
2705 u
->rewatch_pids_event_source
= sd_event_source_unref(u
->rewatch_pids_event_source
);
2708 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2710 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2714 case JOB_VERIFY_ACTIVE
:
2717 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2718 * startable by us but may appear due to external events, and it thus makes sense to permit enqueing
2723 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2724 * external events), hence it makes no sense to permit enqueing such a request either. */
2725 return !u
->perpetual
;
2728 case JOB_TRY_RESTART
:
2729 return unit_can_stop(u
) && unit_can_start(u
);
2732 case JOB_TRY_RELOAD
:
2733 return unit_can_reload(u
);
2735 case JOB_RELOAD_OR_START
:
2736 return unit_can_reload(u
) && unit_can_start(u
);
2739 assert_not_reached("Invalid job type");
2743 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
) {
2746 /* Only warn about some unit types */
2747 if (!IN_SET(dependency
, UNIT_CONFLICTS
, UNIT_CONFLICTED_BY
, UNIT_BEFORE
, UNIT_AFTER
, UNIT_ON_FAILURE
, UNIT_TRIGGERS
, UNIT_TRIGGERED_BY
))
2750 if (streq_ptr(u
->id
, other
))
2751 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
2753 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other
), u
->id
);
2756 static int unit_add_dependency_hashmap(
2759 UnitDependencyMask origin_mask
,
2760 UnitDependencyMask destination_mask
) {
2762 UnitDependencyInfo info
;
2767 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2768 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2769 assert(origin_mask
> 0 || destination_mask
> 0);
2771 r
= hashmap_ensure_allocated(h
, NULL
);
2775 assert_cc(sizeof(void*) == sizeof(info
));
2777 info
.data
= hashmap_get(*h
, other
);
2779 /* Entry already exists. Add in our mask. */
2781 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
2782 FLAGS_SET(destination_mask
, info
.destination_mask
))
2785 info
.origin_mask
|= origin_mask
;
2786 info
.destination_mask
|= destination_mask
;
2788 r
= hashmap_update(*h
, other
, info
.data
);
2790 info
= (UnitDependencyInfo
) {
2791 .origin_mask
= origin_mask
,
2792 .destination_mask
= destination_mask
,
2795 r
= hashmap_put(*h
, other
, info
.data
);
2803 int unit_add_dependency(
2808 UnitDependencyMask mask
) {
2810 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
2811 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
2812 [UNIT_WANTS
] = UNIT_WANTED_BY
,
2813 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
2814 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
2815 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
2816 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
2817 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
2818 [UNIT_WANTED_BY
] = UNIT_WANTS
,
2819 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
2820 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
2821 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
2822 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
2823 [UNIT_BEFORE
] = UNIT_AFTER
,
2824 [UNIT_AFTER
] = UNIT_BEFORE
,
2825 [UNIT_ON_FAILURE
] = _UNIT_DEPENDENCY_INVALID
,
2826 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
2827 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
2828 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
2829 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
2830 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
2831 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
2832 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
,
2834 Unit
*original_u
= u
, *original_other
= other
;
2838 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
2841 u
= unit_follow_merge(u
);
2842 other
= unit_follow_merge(other
);
2844 /* We won't allow dependencies on ourselves. We will not
2845 * consider them an error however. */
2847 maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
2851 if ((d
== UNIT_BEFORE
&& other
->type
== UNIT_DEVICE
) ||
2852 (d
== UNIT_AFTER
&& u
->type
== UNIT_DEVICE
)) {
2853 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
2857 r
= unit_add_dependency_hashmap(u
->dependencies
+ d
, other
, mask
, 0);
2861 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
2862 r
= unit_add_dependency_hashmap(other
->dependencies
+ inverse_table
[d
], u
, 0, mask
);
2867 if (add_reference
) {
2868 r
= unit_add_dependency_hashmap(u
->dependencies
+ UNIT_REFERENCES
, other
, mask
, 0);
2872 r
= unit_add_dependency_hashmap(other
->dependencies
+ UNIT_REFERENCED_BY
, u
, 0, mask
);
2877 unit_add_to_dbus_queue(u
);
2881 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
2886 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
2890 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
2893 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
2901 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
2908 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
2910 _cleanup_free_
char *i
= NULL
;
2912 r
= unit_name_to_prefix(u
->id
, &i
);
2916 r
= unit_name_replace_instance(name
, i
, buf
);
2925 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
2926 _cleanup_free_
char *buf
= NULL
;
2933 r
= resolve_template(u
, name
, &buf
, &name
);
2937 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
2941 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
2944 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
2945 _cleanup_free_
char *buf
= NULL
;
2952 r
= resolve_template(u
, name
, &buf
, &name
);
2956 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
2960 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
2963 int set_unit_path(const char *p
) {
2964 /* This is mostly for debug purposes */
2965 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
2971 char *unit_dbus_path(Unit
*u
) {
2977 return unit_dbus_path_from_name(u
->id
);
2980 char *unit_dbus_path_invocation_id(Unit
*u
) {
2983 if (sd_id128_is_null(u
->invocation_id
))
2986 return unit_dbus_path_from_name(u
->invocation_id_string
);
2989 int unit_set_slice(Unit
*u
, Unit
*slice
) {
2993 /* Sets the unit slice if it has not been set before. Is extra
2994 * careful, to only allow this for units that actually have a
2995 * cgroup context. Also, we don't allow to set this for slices
2996 * (since the parent slice is derived from the name). Make
2997 * sure the unit we set is actually a slice. */
2999 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3002 if (u
->type
== UNIT_SLICE
)
3005 if (unit_active_state(u
) != UNIT_INACTIVE
)
3008 if (slice
->type
!= UNIT_SLICE
)
3011 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3012 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3015 if (UNIT_DEREF(u
->slice
) == slice
)
3018 /* Disallow slice changes if @u is already bound to cgroups */
3019 if (UNIT_ISSET(u
->slice
) && u
->cgroup_realized
)
3022 unit_ref_set(&u
->slice
, u
, slice
);
3026 int unit_set_default_slice(Unit
*u
) {
3027 const char *slice_name
;
3033 if (UNIT_ISSET(u
->slice
))
3037 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3039 /* Implicitly place all instantiated units in their
3040 * own per-template slice */
3042 r
= unit_name_to_prefix(u
->id
, &prefix
);
3046 /* The prefix is already escaped, but it might include
3047 * "-" which has a special meaning for slice units,
3048 * hence escape it here extra. */
3049 escaped
= unit_name_escape(prefix
);
3053 if (MANAGER_IS_SYSTEM(u
->manager
))
3054 slice_name
= strjoina("system-", escaped
, ".slice");
3056 slice_name
= strjoina(escaped
, ".slice");
3059 MANAGER_IS_SYSTEM(u
->manager
) && !unit_has_name(u
, SPECIAL_INIT_SCOPE
)
3060 ? SPECIAL_SYSTEM_SLICE
3061 : SPECIAL_ROOT_SLICE
;
3063 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3067 return unit_set_slice(u
, slice
);
3070 const char *unit_slice_name(Unit
*u
) {
3073 if (!UNIT_ISSET(u
->slice
))
3076 return UNIT_DEREF(u
->slice
)->id
;
3079 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3080 _cleanup_free_
char *t
= NULL
;
3087 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3090 if (unit_has_name(u
, t
))
3093 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3094 assert(r
< 0 || *_found
!= u
);
3098 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3099 const char *name
, *old_owner
, *new_owner
;
3106 r
= sd_bus_message_read(message
, "sss", &name
, &old_owner
, &new_owner
);
3108 bus_log_parse_error(r
);
3112 old_owner
= empty_to_null(old_owner
);
3113 new_owner
= empty_to_null(new_owner
);
3115 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3116 UNIT_VTABLE(u
)->bus_name_owner_change(u
, name
, old_owner
, new_owner
);
3121 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3128 if (u
->match_bus_slot
)
3131 match
= strjoina("type='signal',"
3132 "sender='org.freedesktop.DBus',"
3133 "path='/org/freedesktop/DBus',"
3134 "interface='org.freedesktop.DBus',"
3135 "member='NameOwnerChanged',"
3136 "arg0='", name
, "'");
3138 return sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3141 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3147 /* Watch a specific name on the bus. We only support one unit
3148 * watching each name for now. */
3150 if (u
->manager
->api_bus
) {
3151 /* If the bus is already available, install the match directly.
3152 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3153 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3155 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3158 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3160 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3161 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3167 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3171 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3172 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3175 bool unit_can_serialize(Unit
*u
) {
3178 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
3181 static int serialize_cgroup_mask(FILE *f
, const char *key
, CGroupMask mask
) {
3182 _cleanup_free_
char *s
= NULL
;
3191 r
= cg_mask_to_string(mask
, &s
);
3193 return log_error_errno(r
, "Failed to format cgroup mask: %m");
3195 return serialize_item(f
, key
, s
);
3198 static const char *const ip_accounting_metric_field
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
3199 [CGROUP_IP_INGRESS_BYTES
] = "ip-accounting-ingress-bytes",
3200 [CGROUP_IP_INGRESS_PACKETS
] = "ip-accounting-ingress-packets",
3201 [CGROUP_IP_EGRESS_BYTES
] = "ip-accounting-egress-bytes",
3202 [CGROUP_IP_EGRESS_PACKETS
] = "ip-accounting-egress-packets",
3205 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
, bool serialize_jobs
) {
3206 CGroupIPAccountingMetric m
;
3213 if (unit_can_serialize(u
)) {
3214 r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
);
3219 (void) serialize_dual_timestamp(f
, "state-change-timestamp", &u
->state_change_timestamp
);
3221 (void) serialize_dual_timestamp(f
, "inactive-exit-timestamp", &u
->inactive_exit_timestamp
);
3222 (void) serialize_dual_timestamp(f
, "active-enter-timestamp", &u
->active_enter_timestamp
);
3223 (void) serialize_dual_timestamp(f
, "active-exit-timestamp", &u
->active_exit_timestamp
);
3224 (void) serialize_dual_timestamp(f
, "inactive-enter-timestamp", &u
->inactive_enter_timestamp
);
3226 (void) serialize_dual_timestamp(f
, "condition-timestamp", &u
->condition_timestamp
);
3227 (void) serialize_dual_timestamp(f
, "assert-timestamp", &u
->assert_timestamp
);
3229 if (dual_timestamp_is_set(&u
->condition_timestamp
))
3230 (void) serialize_bool(f
, "condition-result", u
->condition_result
);
3232 if (dual_timestamp_is_set(&u
->assert_timestamp
))
3233 (void) serialize_bool(f
, "assert-result", u
->assert_result
);
3235 (void) serialize_bool(f
, "transient", u
->transient
);
3236 (void) serialize_bool(f
, "in-audit", u
->in_audit
);
3238 (void) serialize_bool(f
, "exported-invocation-id", u
->exported_invocation_id
);
3239 (void) serialize_bool(f
, "exported-log-level-max", u
->exported_log_level_max
);
3240 (void) serialize_bool(f
, "exported-log-extra-fields", u
->exported_log_extra_fields
);
3241 (void) serialize_bool(f
, "exported-log-rate-limit-interval", u
->exported_log_rate_limit_interval
);
3242 (void) serialize_bool(f
, "exported-log-rate-limit-burst", u
->exported_log_rate_limit_burst
);
3244 (void) serialize_item_format(f
, "cpu-usage-base", "%" PRIu64
, u
->cpu_usage_base
);
3245 if (u
->cpu_usage_last
!= NSEC_INFINITY
)
3246 (void) serialize_item_format(f
, "cpu-usage-last", "%" PRIu64
, u
->cpu_usage_last
);
3249 (void) serialize_item(f
, "cgroup", u
->cgroup_path
);
3251 (void) serialize_bool(f
, "cgroup-realized", u
->cgroup_realized
);
3252 (void) serialize_cgroup_mask(f
, "cgroup-realized-mask", u
->cgroup_realized_mask
);
3253 (void) serialize_cgroup_mask(f
, "cgroup-enabled-mask", u
->cgroup_enabled_mask
);
3254 (void) serialize_cgroup_mask(f
, "cgroup-invalidated-mask", u
->cgroup_invalidated_mask
);
3256 if (uid_is_valid(u
->ref_uid
))
3257 (void) serialize_item_format(f
, "ref-uid", UID_FMT
, u
->ref_uid
);
3258 if (gid_is_valid(u
->ref_gid
))
3259 (void) serialize_item_format(f
, "ref-gid", GID_FMT
, u
->ref_gid
);
3261 if (!sd_id128_is_null(u
->invocation_id
))
3262 (void) serialize_item_format(f
, "invocation-id", SD_ID128_FORMAT_STR
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
3264 bus_track_serialize(u
->bus_track
, f
, "ref");
3266 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
3269 r
= unit_get_ip_accounting(u
, m
, &v
);
3271 (void) serialize_item_format(f
, ip_accounting_metric_field
[m
], "%" PRIu64
, v
);
3274 if (serialize_jobs
) {
3277 job_serialize(u
->job
, f
);
3282 job_serialize(u
->nop_job
, f
);
3291 static int unit_deserialize_job(Unit
*u
, FILE *f
) {
3292 _cleanup_(job_freep
) Job
*j
= NULL
;
3302 r
= job_deserialize(j
, f
);
3306 r
= job_install_deserialized(j
);
3314 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
3322 _cleanup_free_
char *line
= NULL
;
3323 CGroupIPAccountingMetric m
;
3327 r
= read_line(f
, LONG_LINE_MAX
, &line
);
3329 return log_error_errno(r
, "Failed to read serialization line: %m");
3330 if (r
== 0) /* eof */
3334 if (isempty(l
)) /* End marker */
3337 k
= strcspn(l
, "=");
3345 if (streq(l
, "job")) {
3347 /* New-style serialized job */
3348 r
= unit_deserialize_job(u
, f
);
3351 } else /* Legacy for pre-44 */
3352 log_unit_warning(u
, "Update from too old systemd versions are unsupported, cannot deserialize job: %s", v
);
3354 } else if (streq(l
, "state-change-timestamp")) {
3355 (void) deserialize_dual_timestamp(v
, &u
->state_change_timestamp
);
3357 } else if (streq(l
, "inactive-exit-timestamp")) {
3358 (void) deserialize_dual_timestamp(v
, &u
->inactive_exit_timestamp
);
3360 } else if (streq(l
, "active-enter-timestamp")) {
3361 (void) deserialize_dual_timestamp(v
, &u
->active_enter_timestamp
);
3363 } else if (streq(l
, "active-exit-timestamp")) {
3364 (void) deserialize_dual_timestamp(v
, &u
->active_exit_timestamp
);
3366 } else if (streq(l
, "inactive-enter-timestamp")) {
3367 (void) deserialize_dual_timestamp(v
, &u
->inactive_enter_timestamp
);
3369 } else if (streq(l
, "condition-timestamp")) {
3370 (void) deserialize_dual_timestamp(v
, &u
->condition_timestamp
);
3372 } else if (streq(l
, "assert-timestamp")) {
3373 (void) deserialize_dual_timestamp(v
, &u
->assert_timestamp
);
3375 } else if (streq(l
, "condition-result")) {
3377 r
= parse_boolean(v
);
3379 log_unit_debug(u
, "Failed to parse condition result value %s, ignoring.", v
);
3381 u
->condition_result
= r
;
3385 } else if (streq(l
, "assert-result")) {
3387 r
= parse_boolean(v
);
3389 log_unit_debug(u
, "Failed to parse assert result value %s, ignoring.", v
);
3391 u
->assert_result
= r
;
3395 } else if (streq(l
, "transient")) {
3397 r
= parse_boolean(v
);
3399 log_unit_debug(u
, "Failed to parse transient bool %s, ignoring.", v
);
3405 } else if (streq(l
, "in-audit")) {
3407 r
= parse_boolean(v
);
3409 log_unit_debug(u
, "Failed to parse in-audit bool %s, ignoring.", v
);
3415 } else if (streq(l
, "exported-invocation-id")) {
3417 r
= parse_boolean(v
);
3419 log_unit_debug(u
, "Failed to parse exported invocation ID bool %s, ignoring.", v
);
3421 u
->exported_invocation_id
= r
;
3425 } else if (streq(l
, "exported-log-level-max")) {
3427 r
= parse_boolean(v
);
3429 log_unit_debug(u
, "Failed to parse exported log level max bool %s, ignoring.", v
);
3431 u
->exported_log_level_max
= r
;
3435 } else if (streq(l
, "exported-log-extra-fields")) {
3437 r
= parse_boolean(v
);
3439 log_unit_debug(u
, "Failed to parse exported log extra fields bool %s, ignoring.", v
);
3441 u
->exported_log_extra_fields
= r
;
3445 } else if (streq(l
, "exported-log-rate-limit-interval")) {
3447 r
= parse_boolean(v
);
3449 log_unit_debug(u
, "Failed to parse exported log rate limit interval %s, ignoring.", v
);
3451 u
->exported_log_rate_limit_interval
= r
;
3455 } else if (streq(l
, "exported-log-rate-limit-burst")) {
3457 r
= parse_boolean(v
);
3459 log_unit_debug(u
, "Failed to parse exported log rate limit burst %s, ignoring.", v
);
3461 u
->exported_log_rate_limit_burst
= r
;
3465 } else if (STR_IN_SET(l
, "cpu-usage-base", "cpuacct-usage-base")) {
3467 r
= safe_atou64(v
, &u
->cpu_usage_base
);
3469 log_unit_debug(u
, "Failed to parse CPU usage base %s, ignoring.", v
);
3473 } else if (streq(l
, "cpu-usage-last")) {
3475 r
= safe_atou64(v
, &u
->cpu_usage_last
);
3477 log_unit_debug(u
, "Failed to read CPU usage last %s, ignoring.", v
);
3481 } else if (streq(l
, "cgroup")) {
3483 r
= unit_set_cgroup_path(u
, v
);
3485 log_unit_debug_errno(u
, r
, "Failed to set cgroup path %s, ignoring: %m", v
);
3487 (void) unit_watch_cgroup(u
);
3490 } else if (streq(l
, "cgroup-realized")) {
3493 b
= parse_boolean(v
);
3495 log_unit_debug(u
, "Failed to parse cgroup-realized bool %s, ignoring.", v
);
3497 u
->cgroup_realized
= b
;
3501 } else if (streq(l
, "cgroup-realized-mask")) {
3503 r
= cg_mask_from_string(v
, &u
->cgroup_realized_mask
);
3505 log_unit_debug(u
, "Failed to parse cgroup-realized-mask %s, ignoring.", v
);
3508 } else if (streq(l
, "cgroup-enabled-mask")) {
3510 r
= cg_mask_from_string(v
, &u
->cgroup_enabled_mask
);
3512 log_unit_debug(u
, "Failed to parse cgroup-enabled-mask %s, ignoring.", v
);
3515 } else if (streq(l
, "cgroup-invalidated-mask")) {
3517 r
= cg_mask_from_string(v
, &u
->cgroup_invalidated_mask
);
3519 log_unit_debug(u
, "Failed to parse cgroup-invalidated-mask %s, ignoring.", v
);
3522 } else if (streq(l
, "ref-uid")) {
3525 r
= parse_uid(v
, &uid
);
3527 log_unit_debug(u
, "Failed to parse referenced UID %s, ignoring.", v
);
3529 unit_ref_uid_gid(u
, uid
, GID_INVALID
);
3533 } else if (streq(l
, "ref-gid")) {
3536 r
= parse_gid(v
, &gid
);
3538 log_unit_debug(u
, "Failed to parse referenced GID %s, ignoring.", v
);
3540 unit_ref_uid_gid(u
, UID_INVALID
, gid
);
3544 } else if (streq(l
, "ref")) {
3546 r
= strv_extend(&u
->deserialized_refs
, v
);
3551 } else if (streq(l
, "invocation-id")) {
3554 r
= sd_id128_from_string(v
, &id
);
3556 log_unit_debug(u
, "Failed to parse invocation id %s, ignoring.", v
);
3558 r
= unit_set_invocation_id(u
, id
);
3560 log_unit_warning_errno(u
, r
, "Failed to set invocation ID for unit: %m");
3566 /* Check if this is an IP accounting metric serialization field */
3567 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++)
3568 if (streq(l
, ip_accounting_metric_field
[m
]))
3570 if (m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
) {
3573 r
= safe_atou64(v
, &c
);
3575 log_unit_debug(u
, "Failed to parse IP accounting value %s, ignoring.", v
);
3577 u
->ip_accounting_extra
[m
] = c
;
3581 if (unit_can_serialize(u
)) {
3582 r
= exec_runtime_deserialize_compat(u
, l
, v
, fds
);
3584 log_unit_warning(u
, "Failed to deserialize runtime parameter '%s', ignoring.", l
);
3588 /* Returns positive if key was handled by the call */
3592 r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
);
3594 log_unit_warning(u
, "Failed to deserialize unit parameter '%s', ignoring.", l
);
3598 /* Versions before 228 did not carry a state change timestamp. In this case, take the current time. This is
3599 * useful, so that timeouts based on this timestamp don't trigger too early, and is in-line with the logic from
3600 * before 228 where the base for timeouts was not persistent across reboots. */
3602 if (!dual_timestamp_is_set(&u
->state_change_timestamp
))
3603 dual_timestamp_get(&u
->state_change_timestamp
);
3605 /* Let's make sure that everything that is deserialized also gets any potential new cgroup settings applied
3606 * after we are done. For that we invalidate anything already realized, so that we can realize it again. */
3607 unit_invalidate_cgroup(u
, _CGROUP_MASK_ALL
);
3608 unit_invalidate_cgroup_bpf(u
);
3613 int unit_deserialize_skip(FILE *f
) {
3617 /* Skip serialized data for this unit. We don't know what it is. */
3620 _cleanup_free_
char *line
= NULL
;
3623 r
= read_line(f
, LONG_LINE_MAX
, &line
);
3625 return log_error_errno(r
, "Failed to read serialization line: %m");
3637 int unit_add_node_dependency(Unit
*u
, const char *what
, bool wants
, UnitDependency dep
, UnitDependencyMask mask
) {
3639 _cleanup_free_
char *e
= NULL
;
3644 /* Adds in links to the device node that this unit is based on */
3648 if (!is_device_path(what
))
3651 /* When device units aren't supported (such as in a
3652 * container), don't create dependencies on them. */
3653 if (!unit_type_supported(UNIT_DEVICE
))
3656 r
= unit_name_from_path(what
, ".device", &e
);
3660 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3664 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3665 dep
= UNIT_BINDS_TO
;
3667 r
= unit_add_two_dependencies(u
, UNIT_AFTER
,
3668 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3669 device
, true, mask
);
3674 r
= unit_add_dependency(device
, UNIT_WANTS
, u
, false, mask
);
3682 int unit_coldplug(Unit
*u
) {
3688 /* Make sure we don't enter a loop, when coldplugging recursively. */
3692 u
->coldplugged
= true;
3694 STRV_FOREACH(i
, u
->deserialized_refs
) {
3695 q
= bus_unit_track_add_name(u
, *i
);
3696 if (q
< 0 && r
>= 0)
3699 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3701 if (UNIT_VTABLE(u
)->coldplug
) {
3702 q
= UNIT_VTABLE(u
)->coldplug(u
);
3703 if (q
< 0 && r
>= 0)
3708 q
= job_coldplug(u
->job
);
3709 if (q
< 0 && r
>= 0)
3716 void unit_catchup(Unit
*u
) {
3719 if (UNIT_VTABLE(u
)->catchup
)
3720 UNIT_VTABLE(u
)->catchup(u
);
3723 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3729 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3730 * are never out-of-date. */
3731 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3734 if (stat(path
, &st
) < 0)
3735 /* What, cannot access this anymore? */
3739 /* For masked files check if they are still so */
3740 return !null_or_empty(&st
);
3742 /* For non-empty files check the mtime */
3743 return timespec_load(&st
.st_mtim
) > mtime
;
3748 bool unit_need_daemon_reload(Unit
*u
) {
3749 _cleanup_strv_free_
char **t
= NULL
;
3754 /* For unit files, we allow masking… */
3755 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3756 u
->load_state
== UNIT_MASKED
))
3759 /* Source paths should not be masked… */
3760 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3763 if (u
->load_state
== UNIT_LOADED
)
3764 (void) unit_find_dropin_paths(u
, &t
);
3765 if (!strv_equal(u
->dropin_paths
, t
))
3768 /* … any drop-ins that are masked are simply omitted from the list. */
3769 STRV_FOREACH(path
, u
->dropin_paths
)
3770 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3776 void unit_reset_failed(Unit
*u
) {
3779 if (UNIT_VTABLE(u
)->reset_failed
)
3780 UNIT_VTABLE(u
)->reset_failed(u
);
3782 RATELIMIT_RESET(u
->start_limit
);
3783 u
->start_limit_hit
= false;
3786 Unit
*unit_following(Unit
*u
) {
3789 if (UNIT_VTABLE(u
)->following
)
3790 return UNIT_VTABLE(u
)->following(u
);
3795 bool unit_stop_pending(Unit
*u
) {
3798 /* This call does check the current state of the unit. It's
3799 * hence useful to be called from state change calls of the
3800 * unit itself, where the state isn't updated yet. This is
3801 * different from unit_inactive_or_pending() which checks both
3802 * the current state and for a queued job. */
3804 return u
->job
&& u
->job
->type
== JOB_STOP
;
3807 bool unit_inactive_or_pending(Unit
*u
) {
3810 /* Returns true if the unit is inactive or going down */
3812 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3815 if (unit_stop_pending(u
))
3821 bool unit_active_or_pending(Unit
*u
) {
3824 /* Returns true if the unit is active or going up */
3826 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3830 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3836 bool unit_will_restart(Unit
*u
) {
3839 if (!UNIT_VTABLE(u
)->will_restart
)
3842 return UNIT_VTABLE(u
)->will_restart(u
);
3845 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3847 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3848 assert(SIGNAL_VALID(signo
));
3850 if (!UNIT_VTABLE(u
)->kill
)
3853 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3856 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3857 _cleanup_set_free_ Set
*pid_set
= NULL
;
3860 pid_set
= set_new(NULL
);
3864 /* Exclude the main/control pids from being killed via the cgroup */
3866 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3871 if (control_pid
> 0) {
3872 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3877 return TAKE_PTR(pid_set
);
3880 int unit_kill_common(
3886 sd_bus_error
*error
) {
3889 bool killed
= false;
3891 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3893 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3894 else if (main_pid
== 0)
3895 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3898 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3899 if (control_pid
< 0)
3900 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3901 else if (control_pid
== 0)
3902 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3905 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3906 if (control_pid
> 0) {
3907 if (kill(control_pid
, signo
) < 0)
3913 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3915 if (kill(main_pid
, signo
) < 0)
3921 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3922 _cleanup_set_free_ Set
*pid_set
= NULL
;
3925 /* Exclude the main/control pids from being killed via the cgroup */
3926 pid_set
= unit_pid_set(main_pid
, control_pid
);
3930 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, NULL
, NULL
);
3931 if (q
< 0 && !IN_SET(q
, -EAGAIN
, -ESRCH
, -ENOENT
))
3937 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
))
3943 int unit_following_set(Unit
*u
, Set
**s
) {
3947 if (UNIT_VTABLE(u
)->following_set
)
3948 return UNIT_VTABLE(u
)->following_set(u
, s
);
3954 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3959 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3960 r
= unit_file_get_state(
3961 u
->manager
->unit_file_scope
,
3964 &u
->unit_file_state
);
3966 u
->unit_file_state
= UNIT_FILE_BAD
;
3969 return u
->unit_file_state
;
3972 int unit_get_unit_file_preset(Unit
*u
) {
3975 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3976 u
->unit_file_preset
= unit_file_query_preset(
3977 u
->manager
->unit_file_scope
,
3979 basename(u
->fragment_path
));
3981 return u
->unit_file_preset
;
3984 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
3990 unit_ref_unset(ref
);
3992 ref
->source
= source
;
3993 ref
->target
= target
;
3994 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
3998 void unit_ref_unset(UnitRef
*ref
) {
4004 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
4005 * be unreferenced now. */
4006 unit_add_to_gc_queue(ref
->target
);
4008 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
4009 ref
->source
= ref
->target
= NULL
;
4012 static int user_from_unit_name(Unit
*u
, char **ret
) {
4014 static const uint8_t hash_key
[] = {
4015 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4016 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4019 _cleanup_free_
char *n
= NULL
;
4022 r
= unit_name_to_prefix(u
->id
, &n
);
4026 if (valid_user_group_name(n
)) {
4031 /* If we can't use the unit name as a user name, then let's hash it and use that */
4032 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4038 int unit_patch_contexts(Unit
*u
) {
4046 /* Patch in the manager defaults into the exec and cgroup
4047 * contexts, _after_ the rest of the settings have been
4050 ec
= unit_get_exec_context(u
);
4052 /* This only copies in the ones that need memory */
4053 for (i
= 0; i
< _RLIMIT_MAX
; i
++)
4054 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4055 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4060 if (MANAGER_IS_USER(u
->manager
) &&
4061 !ec
->working_directory
) {
4063 r
= get_home_dir(&ec
->working_directory
);
4067 /* Allow user services to run, even if the
4068 * home directory is missing */
4069 ec
->working_directory_missing_ok
= true;
4072 if (ec
->private_devices
)
4073 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4075 if (ec
->protect_kernel_modules
)
4076 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4078 if (ec
->dynamic_user
) {
4080 r
= user_from_unit_name(u
, &ec
->user
);
4086 ec
->group
= strdup(ec
->user
);
4091 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4092 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4095 ec
->private_tmp
= true;
4096 ec
->remove_ipc
= true;
4097 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4098 if (ec
->protect_home
== PROTECT_HOME_NO
)
4099 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4101 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4103 ec
->no_new_privileges
= true;
4104 ec
->restrict_suid_sgid
= true;
4108 cc
= unit_get_cgroup_context(u
);
4111 if (ec
->private_devices
&&
4112 cc
->device_policy
== CGROUP_AUTO
)
4113 cc
->device_policy
= CGROUP_CLOSED
;
4115 if (ec
->root_image
&&
4116 (cc
->device_policy
!= CGROUP_AUTO
|| cc
->device_allow
)) {
4118 /* When RootImage= is specified, the following devices are touched. */
4119 r
= cgroup_add_device_allow(cc
, "/dev/loop-control", "rw");
4123 r
= cgroup_add_device_allow(cc
, "block-loop", "rwm");
4127 r
= cgroup_add_device_allow(cc
, "block-blkext", "rwm");
4136 ExecContext
*unit_get_exec_context(Unit
*u
) {
4143 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4147 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4150 KillContext
*unit_get_kill_context(Unit
*u
) {
4157 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4161 return (KillContext
*) ((uint8_t*) u
+ offset
);
4164 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4170 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4174 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4177 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4183 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4187 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4190 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4193 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4196 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4197 return u
->manager
->lookup_paths
.transient
;
4199 if (flags
& UNIT_PERSISTENT
)
4200 return u
->manager
->lookup_paths
.persistent_control
;
4202 if (flags
& UNIT_RUNTIME
)
4203 return u
->manager
->lookup_paths
.runtime_control
;
4208 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4214 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4215 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4216 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4217 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4218 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4221 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4222 ret
= specifier_escape(s
);
4229 if (flags
& UNIT_ESCAPE_C
) {
4242 return ret
?: (char*) s
;
4245 return ret
?: strdup(s
);
4248 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4249 _cleanup_free_
char *result
= NULL
;
4250 size_t n
= 0, allocated
= 0;
4253 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4254 * way suitable for ExecStart= stanzas */
4256 STRV_FOREACH(i
, l
) {
4257 _cleanup_free_
char *buf
= NULL
;
4262 p
= unit_escape_setting(*i
, flags
, &buf
);
4266 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4267 if (!GREEDY_REALLOC(result
, allocated
, n
+ a
+ 1))
4281 if (!GREEDY_REALLOC(result
, allocated
, n
+ 1))
4286 return TAKE_PTR(result
);
4289 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4290 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4291 const char *dir
, *wrapped
;
4298 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4301 data
= unit_escape_setting(data
, flags
, &escaped
);
4305 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4306 * previous section header is the same */
4308 if (flags
& UNIT_PRIVATE
) {
4309 if (!UNIT_VTABLE(u
)->private_section
)
4312 if (!u
->transient_file
|| u
->last_section_private
< 0)
4313 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4314 else if (u
->last_section_private
== 0)
4315 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4317 if (!u
->transient_file
|| u
->last_section_private
< 0)
4318 data
= strjoina("[Unit]\n", data
);
4319 else if (u
->last_section_private
> 0)
4320 data
= strjoina("\n[Unit]\n", data
);
4323 if (u
->transient_file
) {
4324 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4325 * write to the transient unit file. */
4326 fputs(data
, u
->transient_file
);
4328 if (!endswith(data
, "\n"))
4329 fputc('\n', u
->transient_file
);
4331 /* Remember which section we wrote this entry to */
4332 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4336 dir
= unit_drop_in_dir(u
, flags
);
4340 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4341 "# or an equivalent operation. Do not edit.\n",
4345 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4349 (void) mkdir_p_label(p
, 0755);
4350 r
= write_string_file_atomic_label(q
, wrapped
);
4354 r
= strv_push(&u
->dropin_paths
, q
);
4359 strv_uniq(u
->dropin_paths
);
4361 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4366 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4367 _cleanup_free_
char *p
= NULL
;
4375 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4378 va_start(ap
, format
);
4379 r
= vasprintf(&p
, format
, ap
);
4385 return unit_write_setting(u
, flags
, name
, p
);
4388 int unit_make_transient(Unit
*u
) {
4389 _cleanup_free_
char *path
= NULL
;
4394 if (!UNIT_VTABLE(u
)->can_transient
)
4397 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4399 path
= strjoin(u
->manager
->lookup_paths
.transient
, "/", u
->id
);
4403 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4404 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4406 RUN_WITH_UMASK(0022) {
4407 f
= fopen(path
, "we");
4412 safe_fclose(u
->transient_file
);
4413 u
->transient_file
= f
;
4415 free_and_replace(u
->fragment_path
, path
);
4417 u
->source_path
= mfree(u
->source_path
);
4418 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4419 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4421 u
->load_state
= UNIT_STUB
;
4423 u
->transient
= true;
4425 unit_add_to_dbus_queue(u
);
4426 unit_add_to_gc_queue(u
);
4428 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4434 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4435 _cleanup_free_
char *comm
= NULL
;
4437 (void) get_process_comm(pid
, &comm
);
4439 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4440 only, like for example systemd's own PAM stub process. */
4441 if (comm
&& comm
[0] == '(')
4444 log_unit_notice(userdata
,
4445 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4448 signal_to_string(sig
));
4453 static int operation_to_signal(KillContext
*c
, KillOperation k
) {
4458 case KILL_TERMINATE
:
4459 case KILL_TERMINATE_AND_LOG
:
4460 return c
->kill_signal
;
4463 return c
->final_kill_signal
;
4466 return c
->watchdog_signal
;
4469 assert_not_reached("KillOperation unknown");
4473 int unit_kill_context(
4479 bool main_pid_alien
) {
4481 bool wait_for_exit
= false, send_sighup
;
4482 cg_kill_log_func_t log_func
= NULL
;
4488 /* Kill the processes belonging to this unit, in preparation for shutting the unit down.
4489 * Returns > 0 if we killed something worth waiting for, 0 otherwise. */
4491 if (c
->kill_mode
== KILL_NONE
)
4494 sig
= operation_to_signal(c
, k
);
4498 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4501 if (k
!= KILL_TERMINATE
|| IN_SET(sig
, SIGKILL
, SIGABRT
))
4502 log_func
= log_kill
;
4506 log_func(main_pid
, sig
, u
);
4508 r
= kill_and_sigcont(main_pid
, sig
);
4509 if (r
< 0 && r
!= -ESRCH
) {
4510 _cleanup_free_
char *comm
= NULL
;
4511 (void) get_process_comm(main_pid
, &comm
);
4513 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4515 if (!main_pid_alien
)
4516 wait_for_exit
= true;
4518 if (r
!= -ESRCH
&& send_sighup
)
4519 (void) kill(main_pid
, SIGHUP
);
4523 if (control_pid
> 0) {
4525 log_func(control_pid
, sig
, u
);
4527 r
= kill_and_sigcont(control_pid
, sig
);
4528 if (r
< 0 && r
!= -ESRCH
) {
4529 _cleanup_free_
char *comm
= NULL
;
4530 (void) get_process_comm(control_pid
, &comm
);
4532 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4534 wait_for_exit
= true;
4536 if (r
!= -ESRCH
&& send_sighup
)
4537 (void) kill(control_pid
, SIGHUP
);
4541 if (u
->cgroup_path
&&
4542 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4543 _cleanup_set_free_ Set
*pid_set
= NULL
;
4545 /* Exclude the main/control pids from being killed via the cgroup */
4546 pid_set
= unit_pid_set(main_pid
, control_pid
);
4550 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4552 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4556 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4557 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
4561 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4562 * we are running in a container or if this is a delegation unit, simply because cgroup
4563 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4564 * of containers it can be confused easily by left-over directories in the cgroup — which
4565 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4566 * there we get proper events. Hence rely on them. */
4568 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4569 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4570 wait_for_exit
= true;
4575 pid_set
= unit_pid_set(main_pid
, control_pid
);
4579 cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4588 return wait_for_exit
;
4591 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4592 _cleanup_free_
char *p
= NULL
;
4593 UnitDependencyInfo di
;
4599 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these paths in
4600 * the unit (from the path to the UnitDependencyInfo structure indicating how to the dependency came to
4601 * be). However, we build a prefix table for all possible prefixes so that new appearing mount units can easily
4602 * determine which units to make themselves a dependency of. */
4604 if (!path_is_absolute(path
))
4607 r
= hashmap_ensure_allocated(&u
->requires_mounts_for
, &path_hash_ops
);
4615 path
= path_simplify(p
, true);
4617 if (!path_is_normalized(path
))
4620 if (hashmap_contains(u
->requires_mounts_for
, path
))
4623 di
= (UnitDependencyInfo
) {
4627 r
= hashmap_put(u
->requires_mounts_for
, path
, di
.data
);
4632 char prefix
[strlen(path
) + 1];
4633 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4636 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4638 _cleanup_free_
char *q
= NULL
;
4640 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4652 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4668 int unit_setup_exec_runtime(Unit
*u
) {
4676 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4679 /* Check if there already is an ExecRuntime for this unit? */
4680 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4684 /* Try to get it from somebody else */
4685 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_JOINS_NAMESPACE_OF
], i
) {
4686 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4691 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4694 int unit_setup_dynamic_creds(Unit
*u
) {
4696 DynamicCreds
*dcreds
;
4701 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4703 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4705 ec
= unit_get_exec_context(u
);
4708 if (!ec
->dynamic_user
)
4711 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4714 bool unit_type_supported(UnitType t
) {
4715 if (_unlikely_(t
< 0))
4717 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4720 if (!unit_vtable
[t
]->supported
)
4723 return unit_vtable
[t
]->supported();
4726 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4732 r
= dir_is_empty(where
);
4733 if (r
> 0 || r
== -ENOTDIR
)
4736 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4740 log_struct(LOG_NOTICE
,
4741 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4743 LOG_UNIT_INVOCATION_ID(u
),
4744 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4748 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4749 _cleanup_free_
char *canonical_where
= NULL
;
4755 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
);
4757 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4761 /* We will happily ignore a trailing slash (or any redundant slashes) */
4762 if (path_equal(where
, canonical_where
))
4765 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4767 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4769 LOG_UNIT_INVOCATION_ID(u
),
4770 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4776 bool unit_is_pristine(Unit
*u
) {
4779 /* Check if the unit already exists or is already around,
4780 * in a number of different ways. Note that to cater for unit
4781 * types such as slice, we are generally fine with units that
4782 * are marked UNIT_LOADED even though nothing was actually
4783 * loaded, as those unit types don't require a file on disk. */
4785 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4788 !strv_isempty(u
->dropin_paths
) ||
4793 pid_t
unit_control_pid(Unit
*u
) {
4796 if (UNIT_VTABLE(u
)->control_pid
)
4797 return UNIT_VTABLE(u
)->control_pid(u
);
4802 pid_t
unit_main_pid(Unit
*u
) {
4805 if (UNIT_VTABLE(u
)->main_pid
)
4806 return UNIT_VTABLE(u
)->main_pid(u
);
4811 static void unit_unref_uid_internal(
4815 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4819 assert(_manager_unref_uid
);
4821 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4822 * gid_t are actually the same time, with the same validity rules.
4824 * Drops a reference to UID/GID from a unit. */
4826 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4827 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4829 if (!uid_is_valid(*ref_uid
))
4832 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4833 *ref_uid
= UID_INVALID
;
4836 void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4837 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4840 void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4841 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4844 static int unit_ref_uid_internal(
4849 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4855 assert(uid_is_valid(uid
));
4856 assert(_manager_ref_uid
);
4858 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4859 * are actually the same type, and have the same validity rules.
4861 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4862 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4865 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4866 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4868 if (*ref_uid
== uid
)
4871 if (uid_is_valid(*ref_uid
)) /* Already set? */
4874 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4882 int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4883 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4886 int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4887 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4890 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4895 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4897 if (uid_is_valid(uid
)) {
4898 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4903 if (gid_is_valid(gid
)) {
4904 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4907 unit_unref_uid(u
, false);
4913 return r
> 0 || q
> 0;
4916 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4922 c
= unit_get_exec_context(u
);
4924 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4926 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4931 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4934 unit_unref_uid(u
, destroy_now
);
4935 unit_unref_gid(u
, destroy_now
);
4938 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4943 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4944 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4945 * objects when no service references the UID/GID anymore. */
4947 r
= unit_ref_uid_gid(u
, uid
, gid
);
4949 unit_add_to_dbus_queue(u
);
4952 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
4957 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
4959 if (sd_id128_equal(u
->invocation_id
, id
))
4962 if (!sd_id128_is_null(u
->invocation_id
))
4963 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4965 if (sd_id128_is_null(id
)) {
4970 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
4974 u
->invocation_id
= id
;
4975 sd_id128_to_string(id
, u
->invocation_id_string
);
4977 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4984 u
->invocation_id
= SD_ID128_NULL
;
4985 u
->invocation_id_string
[0] = 0;
4989 int unit_acquire_invocation_id(Unit
*u
) {
4995 r
= sd_id128_randomize(&id
);
4997 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
4999 r
= unit_set_invocation_id(u
, id
);
5001 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
5003 unit_add_to_dbus_queue(u
);
5007 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
5013 /* Copy parameters from manager */
5014 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
5018 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
5019 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
5020 p
->prefix
= u
->manager
->prefix
;
5021 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
5023 /* Copy paramaters from unit */
5024 p
->cgroup_path
= u
->cgroup_path
;
5025 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
5030 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
5036 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5037 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5039 (void) unit_realize_cgroup(u
);
5041 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5045 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
, -1);
5046 (void) ignore_signals(SIGPIPE
, -1);
5048 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5050 if (u
->cgroup_path
) {
5051 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5053 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", u
->cgroup_path
);
5061 static void unit_update_dependency_mask(Unit
*u
, UnitDependency d
, Unit
*other
, UnitDependencyInfo di
) {
5064 assert(d
< _UNIT_DEPENDENCY_MAX
);
5067 if (di
.origin_mask
== 0 && di
.destination_mask
== 0) {
5068 /* No bit set anymore, let's drop the whole entry */
5069 assert_se(hashmap_remove(u
->dependencies
[d
], other
));
5070 log_unit_debug(u
, "%s lost dependency %s=%s", u
->id
, unit_dependency_to_string(d
), other
->id
);
5072 /* Mask was reduced, let's update the entry */
5073 assert_se(hashmap_update(u
->dependencies
[d
], other
, di
.data
) == 0);
5076 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5081 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5086 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
5090 UnitDependencyInfo di
;
5096 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
], i
) {
5099 if ((di
.origin_mask
& ~mask
) == di
.origin_mask
)
5101 di
.origin_mask
&= ~mask
;
5102 unit_update_dependency_mask(u
, d
, other
, di
);
5104 /* We updated the dependency from our unit to the other unit now. But most dependencies
5105 * imply a reverse dependency. Hence, let's delete that one too. For that we go through
5106 * all dependency types on the other unit and delete all those which point to us and
5107 * have the right mask set. */
5109 for (q
= 0; q
< _UNIT_DEPENDENCY_MAX
; q
++) {
5110 UnitDependencyInfo dj
;
5112 dj
.data
= hashmap_get(other
->dependencies
[q
], u
);
5113 if ((dj
.destination_mask
& ~mask
) == dj
.destination_mask
)
5115 dj
.destination_mask
&= ~mask
;
5117 unit_update_dependency_mask(other
, q
, u
, dj
);
5120 unit_add_to_gc_queue(other
);
5130 static int unit_export_invocation_id(Unit
*u
) {
5136 if (u
->exported_invocation_id
)
5139 if (sd_id128_is_null(u
->invocation_id
))
5142 p
= strjoina("/run/systemd/units/invocation:", u
->id
);
5143 r
= symlink_atomic(u
->invocation_id_string
, p
);
5145 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5147 u
->exported_invocation_id
= true;
5151 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5159 if (u
->exported_log_level_max
)
5162 if (c
->log_level_max
< 0)
5165 assert(c
->log_level_max
<= 7);
5167 buf
[0] = '0' + c
->log_level_max
;
5170 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5171 r
= symlink_atomic(buf
, p
);
5173 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5175 u
->exported_log_level_max
= true;
5179 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5180 _cleanup_close_
int fd
= -1;
5181 struct iovec
*iovec
;
5189 if (u
->exported_log_extra_fields
)
5192 if (c
->n_log_extra_fields
<= 0)
5195 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5196 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5198 for (i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5199 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5201 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5202 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5205 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5206 pattern
= strjoina(p
, ".XXXXXX");
5208 fd
= mkostemp_safe(pattern
);
5210 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5212 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5214 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5218 (void) fchmod(fd
, 0644);
5220 if (rename(pattern
, p
) < 0) {
5221 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5225 u
->exported_log_extra_fields
= true;
5229 (void) unlink(pattern
);
5233 static int unit_export_log_rate_limit_interval(Unit
*u
, const ExecContext
*c
) {
5234 _cleanup_free_
char *buf
= NULL
;
5241 if (u
->exported_log_rate_limit_interval
)
5244 if (c
->log_rate_limit_interval_usec
== 0)
5247 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5249 if (asprintf(&buf
, "%" PRIu64
, c
->log_rate_limit_interval_usec
) < 0)
5252 r
= symlink_atomic(buf
, p
);
5254 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5256 u
->exported_log_rate_limit_interval
= true;
5260 static int unit_export_log_rate_limit_burst(Unit
*u
, const ExecContext
*c
) {
5261 _cleanup_free_
char *buf
= NULL
;
5268 if (u
->exported_log_rate_limit_burst
)
5271 if (c
->log_rate_limit_burst
== 0)
5274 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5276 if (asprintf(&buf
, "%u", c
->log_rate_limit_burst
) < 0)
5279 r
= symlink_atomic(buf
, p
);
5281 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5283 u
->exported_log_rate_limit_burst
= true;
5287 void unit_export_state_files(Unit
*u
) {
5288 const ExecContext
*c
;
5295 if (!MANAGER_IS_SYSTEM(u
->manager
))
5298 if (MANAGER_IS_TEST_RUN(u
->manager
))
5301 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5302 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5303 * the IPC system itself and PID 1 also log to the journal.
5305 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5306 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5307 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5308 * namespace at least.
5310 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5311 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5314 (void) unit_export_invocation_id(u
);
5316 c
= unit_get_exec_context(u
);
5318 (void) unit_export_log_level_max(u
, c
);
5319 (void) unit_export_log_extra_fields(u
, c
);
5320 (void) unit_export_log_rate_limit_interval(u
, c
);
5321 (void) unit_export_log_rate_limit_burst(u
, c
);
5325 void unit_unlink_state_files(Unit
*u
) {
5333 if (!MANAGER_IS_SYSTEM(u
->manager
))
5336 /* Undoes the effect of unit_export_state() */
5338 if (u
->exported_invocation_id
) {
5339 p
= strjoina("/run/systemd/units/invocation:", u
->id
);
5342 u
->exported_invocation_id
= false;
5345 if (u
->exported_log_level_max
) {
5346 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5349 u
->exported_log_level_max
= false;
5352 if (u
->exported_log_extra_fields
) {
5353 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5356 u
->exported_log_extra_fields
= false;
5359 if (u
->exported_log_rate_limit_interval
) {
5360 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5363 u
->exported_log_rate_limit_interval
= false;
5366 if (u
->exported_log_rate_limit_burst
) {
5367 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5370 u
->exported_log_rate_limit_burst
= false;
5374 int unit_prepare_exec(Unit
*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_cpu_accounting(u
);
5385 (void) unit_reset_ip_accounting(u
);
5386 u
->reset_accounting
= false;
5389 unit_export_state_files(u
);
5391 r
= unit_setup_exec_runtime(u
);
5395 r
= unit_setup_dynamic_creds(u
);
5402 static int log_leftover(pid_t pid
, int sig
, void *userdata
) {
5403 _cleanup_free_
char *comm
= NULL
;
5405 (void) get_process_comm(pid
, &comm
);
5407 if (comm
&& comm
[0] == '(') /* Most likely our own helper process (PAM?), ignore */
5410 log_unit_warning(userdata
,
5411 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5412 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5418 int unit_warn_leftover_processes(Unit
*u
) {
5421 (void) unit_pick_cgroup_path(u
);
5423 if (!u
->cgroup_path
)
5426 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_leftover
, u
);
5429 bool unit_needs_console(Unit
*u
) {
5431 UnitActiveState state
;
5435 state
= unit_active_state(u
);
5437 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5440 if (UNIT_VTABLE(u
)->needs_console
)
5441 return UNIT_VTABLE(u
)->needs_console(u
);
5443 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5444 ec
= unit_get_exec_context(u
);
5448 return exec_context_may_touch_console(ec
);
5451 const char *unit_label_path(Unit
*u
) {
5454 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
5455 * when validating access checks. */
5457 p
= u
->source_path
?: u
->fragment_path
;
5461 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
5462 if (path_equal(p
, "/dev/null"))
5468 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5473 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5474 * and not a kernel thread either */
5476 /* First, a simple range check */
5477 if (!pid_is_valid(pid
))
5478 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5480 /* Some extra safety check */
5481 if (pid
== 1 || pid
== getpid_cached())
5482 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5484 /* Don't even begin to bother with kernel threads */
5485 r
= is_kernel_thread(pid
);
5487 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5489 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5491 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5496 void unit_log_success(Unit
*u
) {
5499 log_struct(LOG_INFO
,
5500 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5502 LOG_UNIT_INVOCATION_ID(u
),
5503 LOG_UNIT_MESSAGE(u
, "Succeeded."));
5506 void unit_log_failure(Unit
*u
, const char *result
) {
5510 log_struct(LOG_WARNING
,
5511 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5513 LOG_UNIT_INVOCATION_ID(u
),
5514 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5515 "UNIT_RESULT=%s", result
);
5518 void unit_log_process_exit(
5522 const char *command
,
5529 if (code
!= CLD_EXITED
)
5530 level
= LOG_WARNING
;
5533 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5534 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s",
5536 sigchld_code_to_string(code
), status
,
5537 strna(code
== CLD_EXITED
5538 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5539 : signal_to_string(status
))),
5540 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5541 "EXIT_STATUS=%i", status
,
5542 "COMMAND=%s", strna(command
),
5544 LOG_UNIT_INVOCATION_ID(u
));
5547 int unit_exit_status(Unit
*u
) {
5550 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5551 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5552 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5553 * service process has exited abnormally (signal/coredump). */
5555 if (!UNIT_VTABLE(u
)->exit_status
)
5558 return UNIT_VTABLE(u
)->exit_status(u
);
5561 int unit_failure_action_exit_status(Unit
*u
) {
5566 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5568 if (u
->failure_action_exit_status
>= 0)
5569 return u
->failure_action_exit_status
;
5571 r
= unit_exit_status(u
);
5572 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5578 int unit_success_action_exit_status(Unit
*u
) {
5583 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5585 if (u
->success_action_exit_status
>= 0)
5586 return u
->success_action_exit_status
;
5588 r
= unit_exit_status(u
);
5589 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5595 int unit_test_trigger_loaded(Unit
*u
) {
5598 /* Tests whether the unit to trigger is loaded */
5600 trigger
= UNIT_TRIGGER(u
);
5602 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
), "Refusing to start, unit to trigger not loaded.");
5603 if (trigger
->load_state
!= UNIT_LOADED
)
5604 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
), "Refusing to start, unit %s to trigger not loaded.", u
->id
);
5609 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5610 [COLLECT_INACTIVE
] = "inactive",
5611 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5614 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);