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");
1592 static bool unit_condition_test_list(Unit
*u
, Condition
*first
, const char *(*to_string
)(ConditionType t
)) {
1599 /* If the condition list is empty, then it is true */
1603 /* Otherwise, if all of the non-trigger conditions apply and
1604 * if any of the trigger conditions apply (unless there are
1605 * none) we return true */
1606 LIST_FOREACH(conditions
, c
, first
) {
1609 r
= condition_test(c
);
1612 "Couldn't determine result for %s=%s%s%s, assuming failed: %m",
1614 c
->trigger
? "|" : "",
1615 c
->negate
? "!" : "",
1621 c
->trigger
? "|" : "",
1622 c
->negate
? "!" : "",
1624 condition_result_to_string(c
->result
));
1626 if (!c
->trigger
&& r
<= 0)
1629 if (c
->trigger
&& triggered
<= 0)
1633 return triggered
!= 0;
1636 static bool unit_condition_test(Unit
*u
) {
1639 dual_timestamp_get(&u
->condition_timestamp
);
1640 u
->condition_result
= unit_condition_test_list(u
, u
->conditions
, condition_type_to_string
);
1642 unit_add_to_dbus_queue(u
);
1644 return u
->condition_result
;
1647 static bool unit_assert_test(Unit
*u
) {
1650 dual_timestamp_get(&u
->assert_timestamp
);
1651 u
->assert_result
= unit_condition_test_list(u
, u
->asserts
, assert_type_to_string
);
1653 unit_add_to_dbus_queue(u
);
1655 return u
->assert_result
;
1658 void unit_status_printf(Unit
*u
, const char *status
, const char *unit_status_msg_format
) {
1661 d
= unit_description(u
);
1662 if (log_get_show_color())
1663 d
= strjoina(ANSI_HIGHLIGHT
, d
, ANSI_NORMAL
);
1665 DISABLE_WARNING_FORMAT_NONLITERAL
;
1666 manager_status_printf(u
->manager
, STATUS_TYPE_NORMAL
, status
, unit_status_msg_format
, d
);
1670 int unit_start_limit_test(Unit
*u
) {
1675 if (ratelimit_below(&u
->start_limit
)) {
1676 u
->start_limit_hit
= false;
1680 log_unit_warning(u
, "Start request repeated too quickly.");
1681 u
->start_limit_hit
= true;
1683 reason
= strjoina("unit ", u
->id
, " failed");
1685 return emergency_action(u
->manager
, u
->start_limit_action
,
1686 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1687 u
->reboot_arg
, -1, reason
);
1690 bool unit_shall_confirm_spawn(Unit
*u
) {
1693 if (manager_is_confirm_spawn_disabled(u
->manager
))
1696 /* For some reasons units remaining in the same process group
1697 * as PID 1 fail to acquire the console even if it's not used
1698 * by any process. So skip the confirmation question for them. */
1699 return !unit_get_exec_context(u
)->same_pgrp
;
1702 static bool unit_verify_deps(Unit
*u
) {
1709 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined with
1710 * After=. We do not check Requires= or Requisite= here as they only should have an effect on the job
1711 * processing, but do not have any effect afterwards. We don't check BindsTo= dependencies that are not used in
1712 * conjunction with After= as for them any such check would make things entirely racy. */
1714 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], j
) {
1716 if (!hashmap_contains(u
->dependencies
[UNIT_AFTER
], other
))
1719 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1720 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1729 * -EBADR: This unit type does not support starting.
1730 * -EALREADY: Unit is already started.
1731 * -EAGAIN: An operation is already in progress. Retry later.
1732 * -ECANCELED: Too many requests for now.
1733 * -EPROTO: Assert failed
1734 * -EINVAL: Unit not loaded
1735 * -EOPNOTSUPP: Unit type not supported
1736 * -ENOLINK: The necessary dependencies are not fulfilled.
1737 * -ESTALE: This unit has been started before and can't be started a second time
1739 int unit_start(Unit
*u
) {
1740 UnitActiveState state
;
1745 /* If this is already started, then this will succeed. Note
1746 * that this will even succeed if this unit is not startable
1747 * by the user. This is relied on to detect when we need to
1748 * wait for units and when waiting is finished. */
1749 state
= unit_active_state(u
);
1750 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1753 /* Units that aren't loaded cannot be started */
1754 if (u
->load_state
!= UNIT_LOADED
)
1757 /* Refuse starting scope units more than once */
1758 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1761 /* If the conditions failed, don't do anything at all. If we
1762 * already are activating this call might still be useful to
1763 * speed up activation in case there is some hold-off time,
1764 * but we don't want to recheck the condition in that case. */
1765 if (state
!= UNIT_ACTIVATING
&&
1766 !unit_condition_test(u
)) {
1767 log_unit_debug(u
, "Starting requested but condition failed. Not starting unit.");
1771 /* If the asserts failed, fail the entire job */
1772 if (state
!= UNIT_ACTIVATING
&&
1773 !unit_assert_test(u
)) {
1774 log_unit_notice(u
, "Starting requested but asserts failed.");
1778 /* Units of types that aren't supported cannot be
1779 * started. Note that we do this test only after the condition
1780 * checks, so that we rather return condition check errors
1781 * (which are usually not considered a true failure) than "not
1782 * supported" errors (which are considered a failure).
1784 if (!unit_supported(u
))
1787 /* Let's make sure that the deps really are in order before we start this. Normally the job engine should have
1788 * taken care of this already, but let's check this here again. After all, our dependencies might not be in
1789 * effect anymore, due to a reload or due to a failed condition. */
1790 if (!unit_verify_deps(u
))
1793 /* Forward to the main object, if we aren't it. */
1794 following
= unit_following(u
);
1796 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1797 return unit_start(following
);
1800 /* If it is stopped, but we cannot start it, then fail */
1801 if (!UNIT_VTABLE(u
)->start
)
1804 /* We don't suppress calls to ->start() here when we are
1805 * already starting, to allow this request to be used as a
1806 * "hurry up" call, for example when the unit is in some "auto
1807 * restart" state where it waits for a holdoff timer to elapse
1808 * before it will start again. */
1810 unit_add_to_dbus_queue(u
);
1812 return UNIT_VTABLE(u
)->start(u
);
1815 bool unit_can_start(Unit
*u
) {
1818 if (u
->load_state
!= UNIT_LOADED
)
1821 if (!unit_supported(u
))
1824 /* Scope units may be started only once */
1825 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
1828 return !!UNIT_VTABLE(u
)->start
;
1831 bool unit_can_isolate(Unit
*u
) {
1834 return unit_can_start(u
) &&
1839 * -EBADR: This unit type does not support stopping.
1840 * -EALREADY: Unit is already stopped.
1841 * -EAGAIN: An operation is already in progress. Retry later.
1843 int unit_stop(Unit
*u
) {
1844 UnitActiveState state
;
1849 state
= unit_active_state(u
);
1850 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1853 following
= unit_following(u
);
1855 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1856 return unit_stop(following
);
1859 if (!UNIT_VTABLE(u
)->stop
)
1862 unit_add_to_dbus_queue(u
);
1864 return UNIT_VTABLE(u
)->stop(u
);
1867 bool unit_can_stop(Unit
*u
) {
1870 if (!unit_supported(u
))
1876 return !!UNIT_VTABLE(u
)->stop
;
1880 * -EBADR: This unit type does not support reloading.
1881 * -ENOEXEC: Unit is not started.
1882 * -EAGAIN: An operation is already in progress. Retry later.
1884 int unit_reload(Unit
*u
) {
1885 UnitActiveState state
;
1890 if (u
->load_state
!= UNIT_LOADED
)
1893 if (!unit_can_reload(u
))
1896 state
= unit_active_state(u
);
1897 if (state
== UNIT_RELOADING
)
1900 if (state
!= UNIT_ACTIVE
) {
1901 log_unit_warning(u
, "Unit cannot be reloaded because it is inactive.");
1905 following
= unit_following(u
);
1907 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
1908 return unit_reload(following
);
1911 unit_add_to_dbus_queue(u
);
1913 if (!UNIT_VTABLE(u
)->reload
) {
1914 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
1915 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), 0);
1919 return UNIT_VTABLE(u
)->reload(u
);
1922 bool unit_can_reload(Unit
*u
) {
1925 if (UNIT_VTABLE(u
)->can_reload
)
1926 return UNIT_VTABLE(u
)->can_reload(u
);
1928 if (!hashmap_isempty(u
->dependencies
[UNIT_PROPAGATES_RELOAD_TO
]))
1931 return UNIT_VTABLE(u
)->reload
;
1934 bool unit_is_unneeded(Unit
*u
) {
1935 static const UnitDependency deps
[] = {
1945 if (!u
->stop_when_unneeded
)
1948 /* Don't clean up while the unit is transitioning or is even inactive. */
1949 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
1954 for (j
= 0; j
< ELEMENTSOF(deps
); j
++) {
1959 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
1960 * restart, then don't clean this one up. */
1962 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[deps
[j
]], i
) {
1966 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1969 if (unit_will_restart(other
))
1977 static void check_unneeded_dependencies(Unit
*u
) {
1979 static const UnitDependency deps
[] = {
1989 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
1991 for (j
= 0; j
< ELEMENTSOF(deps
); j
++) {
1996 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[deps
[j
]], i
)
1997 unit_submit_to_stop_when_unneeded_queue(other
);
2001 static void unit_check_binds_to(Unit
*u
) {
2002 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2014 if (unit_active_state(u
) != UNIT_ACTIVE
)
2017 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
) {
2021 if (!other
->coldplugged
)
2022 /* We might yet create a job for the other unit… */
2025 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2035 /* If stopping a unit fails continuously we might enter a stop
2036 * loop here, hence stop acting on the service being
2037 * unnecessary after a while. */
2038 if (!ratelimit_below(&u
->auto_stop_ratelimit
)) {
2039 log_unit_warning(u
, "Unit is bound to inactive unit %s, but not stopping since we tried this too often recently.", other
->id
);
2044 log_unit_info(u
, "Unit is bound to inactive unit %s. Stopping, too.", other
->id
);
2046 /* A unit we need to run is gone. Sniff. Let's stop this. */
2047 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, &error
, NULL
);
2049 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
2052 static void retroactively_start_dependencies(Unit
*u
) {
2058 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2060 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_REQUIRES
], i
)
2061 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2062 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2063 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
);
2065 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BINDS_TO
], i
)
2066 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2067 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2068 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
);
2070 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_WANTS
], i
)
2071 if (!hashmap_get(u
->dependencies
[UNIT_AFTER
], other
) &&
2072 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2073 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
);
2075 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTS
], i
)
2076 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2077 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2079 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_CONFLICTED_BY
], i
)
2080 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2081 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2084 static void retroactively_stop_dependencies(Unit
*u
) {
2090 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2092 /* Pull down units which are bound to us recursively if enabled */
2093 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_BOUND_BY
], i
)
2094 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2095 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
2098 void unit_start_on_failure(Unit
*u
) {
2106 if (hashmap_size(u
->dependencies
[UNIT_ON_FAILURE
]) <= 0)
2109 log_unit_info(u
, "Triggering OnFailure= dependencies.");
2111 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_ON_FAILURE
], i
) {
2112 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2114 r
= manager_add_job(u
->manager
, JOB_START
, other
, u
->on_failure_job_mode
, &error
, NULL
);
2116 log_unit_warning_errno(u
, r
, "Failed to enqueue OnFailure= job, ignoring: %s", bus_error_message(&error
, r
));
2120 void unit_trigger_notify(Unit
*u
) {
2127 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_TRIGGERED_BY
], i
)
2128 if (UNIT_VTABLE(other
)->trigger_notify
)
2129 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2132 static int unit_log_resources(Unit
*u
) {
2133 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ 4];
2134 bool any_traffic
= false, have_ip_accounting
= false;
2135 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
;
2136 size_t n_message_parts
= 0, n_iovec
= 0;
2137 char* message_parts
[3 + 1], *t
;
2138 nsec_t nsec
= NSEC_INFINITY
;
2139 CGroupIPAccountingMetric m
;
2142 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2143 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2144 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2145 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2146 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2151 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2152 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2153 * information and the complete data in structured fields. */
2155 (void) unit_get_cpu_usage(u
, &nsec
);
2156 if (nsec
!= NSEC_INFINITY
) {
2157 char buf
[FORMAT_TIMESPAN_MAX
] = "";
2159 /* Format the CPU time for inclusion in the structured log message */
2160 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2164 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2166 /* Format the CPU time for inclusion in the human language message string */
2167 format_timespan(buf
, sizeof(buf
), nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
);
2168 t
= strjoin("consumed ", buf
, " CPU time");
2174 message_parts
[n_message_parts
++] = t
;
2177 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2178 char buf
[FORMAT_BYTES_MAX
] = "";
2179 uint64_t value
= UINT64_MAX
;
2181 assert(ip_fields
[m
]);
2183 (void) unit_get_ip_accounting(u
, m
, &value
);
2184 if (value
== UINT64_MAX
)
2187 have_ip_accounting
= true;
2191 /* Format IP accounting data for inclusion in the structured log message */
2192 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2196 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2198 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2199 * bytes counters (and not for the packets counters) */
2200 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2202 igress
= strjoin("received ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2207 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2209 egress
= strjoin("sent ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2217 if (have_ip_accounting
) {
2220 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2222 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2227 k
= strdup("no IP traffic");
2233 message_parts
[n_message_parts
++] = k
;
2237 /* Is there any accounting data available at all? */
2243 if (n_message_parts
== 0)
2244 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2246 _cleanup_free_
char *joined
;
2248 message_parts
[n_message_parts
] = NULL
;
2250 joined
= strv_join(message_parts
, ", ");
2256 joined
[0] = ascii_toupper(joined
[0]);
2257 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2260 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2261 * and hence don't increase n_iovec for them */
2262 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2263 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2265 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2266 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2268 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2269 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2271 log_struct_iovec(LOG_INFO
, iovec
, n_iovec
+ 4);
2275 for (i
= 0; i
< n_message_parts
; i
++)
2276 free(message_parts
[i
]);
2278 for (i
= 0; i
< n_iovec
; i
++)
2279 free(iovec
[i
].iov_base
);
2285 static void unit_update_on_console(Unit
*u
) {
2290 b
= unit_needs_console(u
);
2291 if (u
->on_console
== b
)
2296 manager_ref_console(u
->manager
);
2298 manager_unref_console(u
->manager
);
2301 static void unit_emit_audit_start(Unit
*u
) {
2304 if (u
->type
!= UNIT_SERVICE
)
2307 /* Write audit record if we have just finished starting up */
2308 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2312 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2315 if (u
->type
!= UNIT_SERVICE
)
2319 /* Write audit record if we have just finished shutting down */
2320 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2321 u
->in_audit
= false;
2323 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2324 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2326 if (state
== UNIT_INACTIVE
)
2327 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2331 static bool unit_process_job(Job
*j
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2332 bool unexpected
= false;
2336 if (j
->state
== JOB_WAITING
)
2338 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2340 job_add_to_run_queue(j
);
2342 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2343 * hence needs to invalidate jobs. */
2348 case JOB_VERIFY_ACTIVE
:
2350 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2351 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2352 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2355 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2356 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2362 case JOB_RELOAD_OR_START
:
2363 case JOB_TRY_RELOAD
:
2365 if (j
->state
== JOB_RUNNING
) {
2366 if (ns
== UNIT_ACTIVE
)
2367 job_finish_and_invalidate(j
, (flags
& UNIT_NOTIFY_RELOAD_FAILURE
) ? JOB_FAILED
: JOB_DONE
, true, false);
2368 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2371 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2372 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2380 case JOB_TRY_RESTART
:
2382 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2383 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2384 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2386 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2392 assert_not_reached("Job type unknown");
2398 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2403 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2404 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2406 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2407 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2408 * remounted this function will be called too! */
2412 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2413 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2414 unit_add_to_dbus_queue(u
);
2416 /* Update timestamps for state changes */
2417 if (!MANAGER_IS_RELOADING(m
)) {
2418 dual_timestamp_get(&u
->state_change_timestamp
);
2420 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2421 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2422 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2423 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2425 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2426 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2427 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2428 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2431 /* Keep track of failed units */
2432 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2434 /* Make sure the cgroup and state files are always removed when we become inactive */
2435 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2436 unit_prune_cgroup(u
);
2437 unit_unlink_state_files(u
);
2440 unit_update_on_console(u
);
2442 if (!MANAGER_IS_RELOADING(m
)) {
2445 /* Let's propagate state changes to the job */
2447 unexpected
= unit_process_job(u
->job
, ns
, flags
);
2451 /* If this state change happened without being requested by a job, then let's retroactively start or
2452 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2453 * additional jobs just because something is already activated. */
2456 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2457 retroactively_start_dependencies(u
);
2458 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2459 retroactively_stop_dependencies(u
);
2462 /* stop unneeded units regardless if going down was expected or not */
2463 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2464 check_unneeded_dependencies(u
);
2466 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2467 log_unit_debug(u
, "Unit entered failed state.");
2469 if (!(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2470 unit_start_on_failure(u
);
2473 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2474 /* This unit just finished starting up */
2476 unit_emit_audit_start(u
);
2477 manager_send_unit_plymouth(m
, u
);
2480 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2481 /* This unit just stopped/failed. */
2483 unit_emit_audit_stop(u
, ns
);
2484 unit_log_resources(u
);
2488 manager_recheck_journal(m
);
2489 manager_recheck_dbus(m
);
2491 unit_trigger_notify(u
);
2493 if (!MANAGER_IS_RELOADING(m
)) {
2494 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2495 unit_submit_to_stop_when_unneeded_queue(u
);
2497 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens when
2498 * something BindsTo= to a Type=oneshot unit, as these units go directly from starting to inactive,
2499 * without ever entering started.) */
2500 unit_check_binds_to(u
);
2502 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2503 reason
= strjoina("unit ", u
->id
, " failed");
2504 (void) emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2505 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2506 reason
= strjoina("unit ", u
->id
, " succeeded");
2507 (void) emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2511 unit_add_to_gc_queue(u
);
2514 int unit_watch_pid(Unit
*u
, pid_t pid
) {
2518 assert(pid_is_valid(pid
));
2520 /* Watch a specific PID */
2522 r
= set_ensure_allocated(&u
->pids
, NULL
);
2526 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2530 /* First try, let's add the unit keyed by "pid". */
2531 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2537 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2538 * to an array of Units rather than just a Unit), lists us already. */
2540 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2542 for (; array
[n
]; n
++)
2546 if (found
) /* Found it already? if so, do nothing */
2551 /* Allocate a new array */
2552 new_array
= new(Unit
*, n
+ 2);
2556 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2558 new_array
[n
+1] = NULL
;
2560 /* Add or replace the old array */
2561 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2572 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2579 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2583 assert(pid_is_valid(pid
));
2585 /* First let's drop the unit in case it's keyed as "pid". */
2586 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2588 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2589 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2593 /* Let's iterate through the array, dropping our own entry */
2594 for (n
= 0; array
[n
]; n
++)
2596 array
[m
++] = array
[n
];
2600 /* The array is now empty, remove the entire entry */
2601 assert(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2606 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2609 void unit_unwatch_all_pids(Unit
*u
) {
2612 while (!set_isempty(u
->pids
))
2613 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2615 u
->pids
= set_free(u
->pids
);
2618 static void unit_tidy_watch_pids(Unit
*u
) {
2619 pid_t except1
, except2
;
2625 /* Cleans dead PIDs from our list */
2627 except1
= unit_main_pid(u
);
2628 except2
= unit_control_pid(u
);
2630 SET_FOREACH(e
, u
->pids
, i
) {
2631 pid_t pid
= PTR_TO_PID(e
);
2633 if (pid
== except1
|| pid
== except2
)
2636 if (!pid_is_unwaited(pid
))
2637 unit_unwatch_pid(u
, pid
);
2641 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2647 unit_tidy_watch_pids(u
);
2648 unit_watch_all_pids(u
);
2650 /* If the PID set is empty now, then let's finish this off. */
2651 unit_synthesize_cgroup_empty_event(u
);
2656 int unit_enqueue_rewatch_pids(Unit
*u
) {
2661 if (!u
->cgroup_path
)
2664 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2667 if (r
> 0) /* On unified we can use proper notifications */
2670 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2671 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2672 * involves issuing kill(pid, 0) on all processes we watch. */
2674 if (!u
->rewatch_pids_event_source
) {
2675 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2677 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2679 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2681 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2683 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: m");
2685 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2687 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2690 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2692 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2697 void unit_dequeue_rewatch_pids(Unit
*u
) {
2701 if (!u
->rewatch_pids_event_source
)
2704 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
2706 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
2708 u
->rewatch_pids_event_source
= sd_event_source_unref(u
->rewatch_pids_event_source
);
2711 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2713 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2717 case JOB_VERIFY_ACTIVE
:
2720 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2721 * startable by us but may appear due to external events, and it thus makes sense to permit enqueing
2726 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2727 * external events), hence it makes no sense to permit enqueing such a request either. */
2728 return !u
->perpetual
;
2731 case JOB_TRY_RESTART
:
2732 return unit_can_stop(u
) && unit_can_start(u
);
2735 case JOB_TRY_RELOAD
:
2736 return unit_can_reload(u
);
2738 case JOB_RELOAD_OR_START
:
2739 return unit_can_reload(u
) && unit_can_start(u
);
2742 assert_not_reached("Invalid job type");
2746 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
) {
2749 /* Only warn about some unit types */
2750 if (!IN_SET(dependency
, UNIT_CONFLICTS
, UNIT_CONFLICTED_BY
, UNIT_BEFORE
, UNIT_AFTER
, UNIT_ON_FAILURE
, UNIT_TRIGGERS
, UNIT_TRIGGERED_BY
))
2753 if (streq_ptr(u
->id
, other
))
2754 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
2756 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other
), u
->id
);
2759 static int unit_add_dependency_hashmap(
2762 UnitDependencyMask origin_mask
,
2763 UnitDependencyMask destination_mask
) {
2765 UnitDependencyInfo info
;
2770 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2771 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
2772 assert(origin_mask
> 0 || destination_mask
> 0);
2774 r
= hashmap_ensure_allocated(h
, NULL
);
2778 assert_cc(sizeof(void*) == sizeof(info
));
2780 info
.data
= hashmap_get(*h
, other
);
2782 /* Entry already exists. Add in our mask. */
2784 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
2785 FLAGS_SET(destination_mask
, info
.destination_mask
))
2788 info
.origin_mask
|= origin_mask
;
2789 info
.destination_mask
|= destination_mask
;
2791 r
= hashmap_update(*h
, other
, info
.data
);
2793 info
= (UnitDependencyInfo
) {
2794 .origin_mask
= origin_mask
,
2795 .destination_mask
= destination_mask
,
2798 r
= hashmap_put(*h
, other
, info
.data
);
2806 int unit_add_dependency(
2811 UnitDependencyMask mask
) {
2813 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
2814 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
2815 [UNIT_WANTS
] = UNIT_WANTED_BY
,
2816 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
2817 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
2818 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
2819 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
2820 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
2821 [UNIT_WANTED_BY
] = UNIT_WANTS
,
2822 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
2823 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
2824 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
2825 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
2826 [UNIT_BEFORE
] = UNIT_AFTER
,
2827 [UNIT_AFTER
] = UNIT_BEFORE
,
2828 [UNIT_ON_FAILURE
] = _UNIT_DEPENDENCY_INVALID
,
2829 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
2830 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
2831 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
2832 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
2833 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
2834 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
2835 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
,
2837 Unit
*original_u
= u
, *original_other
= other
;
2841 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
2844 u
= unit_follow_merge(u
);
2845 other
= unit_follow_merge(other
);
2847 /* We won't allow dependencies on ourselves. We will not
2848 * consider them an error however. */
2850 maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
2854 if ((d
== UNIT_BEFORE
&& other
->type
== UNIT_DEVICE
) ||
2855 (d
== UNIT_AFTER
&& u
->type
== UNIT_DEVICE
)) {
2856 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
2860 r
= unit_add_dependency_hashmap(u
->dependencies
+ d
, other
, mask
, 0);
2864 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
2865 r
= unit_add_dependency_hashmap(other
->dependencies
+ inverse_table
[d
], u
, 0, mask
);
2870 if (add_reference
) {
2871 r
= unit_add_dependency_hashmap(u
->dependencies
+ UNIT_REFERENCES
, other
, mask
, 0);
2875 r
= unit_add_dependency_hashmap(other
->dependencies
+ UNIT_REFERENCED_BY
, u
, 0, mask
);
2880 unit_add_to_dbus_queue(u
);
2884 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
2889 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
2893 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
2896 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
2904 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
2911 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
2913 _cleanup_free_
char *i
= NULL
;
2915 r
= unit_name_to_prefix(u
->id
, &i
);
2919 r
= unit_name_replace_instance(name
, i
, buf
);
2928 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
2929 _cleanup_free_
char *buf
= NULL
;
2936 r
= resolve_template(u
, name
, &buf
, &name
);
2940 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
2944 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
2947 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
2948 _cleanup_free_
char *buf
= NULL
;
2955 r
= resolve_template(u
, name
, &buf
, &name
);
2959 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
2963 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
2966 int set_unit_path(const char *p
) {
2967 /* This is mostly for debug purposes */
2968 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
2974 char *unit_dbus_path(Unit
*u
) {
2980 return unit_dbus_path_from_name(u
->id
);
2983 char *unit_dbus_path_invocation_id(Unit
*u
) {
2986 if (sd_id128_is_null(u
->invocation_id
))
2989 return unit_dbus_path_from_name(u
->invocation_id_string
);
2992 int unit_set_slice(Unit
*u
, Unit
*slice
) {
2996 /* Sets the unit slice if it has not been set before. Is extra
2997 * careful, to only allow this for units that actually have a
2998 * cgroup context. Also, we don't allow to set this for slices
2999 * (since the parent slice is derived from the name). Make
3000 * sure the unit we set is actually a slice. */
3002 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3005 if (u
->type
== UNIT_SLICE
)
3008 if (unit_active_state(u
) != UNIT_INACTIVE
)
3011 if (slice
->type
!= UNIT_SLICE
)
3014 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3015 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3018 if (UNIT_DEREF(u
->slice
) == slice
)
3021 /* Disallow slice changes if @u is already bound to cgroups */
3022 if (UNIT_ISSET(u
->slice
) && u
->cgroup_realized
)
3025 unit_ref_set(&u
->slice
, u
, slice
);
3029 int unit_set_default_slice(Unit
*u
) {
3030 const char *slice_name
;
3036 if (UNIT_ISSET(u
->slice
))
3040 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3042 /* Implicitly place all instantiated units in their
3043 * own per-template slice */
3045 r
= unit_name_to_prefix(u
->id
, &prefix
);
3049 /* The prefix is already escaped, but it might include
3050 * "-" which has a special meaning for slice units,
3051 * hence escape it here extra. */
3052 escaped
= unit_name_escape(prefix
);
3056 if (MANAGER_IS_SYSTEM(u
->manager
))
3057 slice_name
= strjoina("system-", escaped
, ".slice");
3059 slice_name
= strjoina(escaped
, ".slice");
3062 MANAGER_IS_SYSTEM(u
->manager
) && !unit_has_name(u
, SPECIAL_INIT_SCOPE
)
3063 ? SPECIAL_SYSTEM_SLICE
3064 : SPECIAL_ROOT_SLICE
;
3066 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3070 return unit_set_slice(u
, slice
);
3073 const char *unit_slice_name(Unit
*u
) {
3076 if (!UNIT_ISSET(u
->slice
))
3079 return UNIT_DEREF(u
->slice
)->id
;
3082 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3083 _cleanup_free_
char *t
= NULL
;
3090 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3093 if (unit_has_name(u
, t
))
3096 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3097 assert(r
< 0 || *_found
!= u
);
3101 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3102 const char *name
, *old_owner
, *new_owner
;
3109 r
= sd_bus_message_read(message
, "sss", &name
, &old_owner
, &new_owner
);
3111 bus_log_parse_error(r
);
3115 old_owner
= empty_to_null(old_owner
);
3116 new_owner
= empty_to_null(new_owner
);
3118 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3119 UNIT_VTABLE(u
)->bus_name_owner_change(u
, name
, old_owner
, new_owner
);
3124 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3131 if (u
->match_bus_slot
)
3134 match
= strjoina("type='signal',"
3135 "sender='org.freedesktop.DBus',"
3136 "path='/org/freedesktop/DBus',"
3137 "interface='org.freedesktop.DBus',"
3138 "member='NameOwnerChanged',"
3139 "arg0='", name
, "'");
3141 return sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3144 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3150 /* Watch a specific name on the bus. We only support one unit
3151 * watching each name for now. */
3153 if (u
->manager
->api_bus
) {
3154 /* If the bus is already available, install the match directly.
3155 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3156 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3158 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3161 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3163 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3164 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3170 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3174 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3175 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3178 bool unit_can_serialize(Unit
*u
) {
3181 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
3184 static int serialize_cgroup_mask(FILE *f
, const char *key
, CGroupMask mask
) {
3185 _cleanup_free_
char *s
= NULL
;
3194 r
= cg_mask_to_string(mask
, &s
);
3196 return log_error_errno(r
, "Failed to format cgroup mask: %m");
3198 return serialize_item(f
, key
, s
);
3201 static const char *ip_accounting_metric_field
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
3202 [CGROUP_IP_INGRESS_BYTES
] = "ip-accounting-ingress-bytes",
3203 [CGROUP_IP_INGRESS_PACKETS
] = "ip-accounting-ingress-packets",
3204 [CGROUP_IP_EGRESS_BYTES
] = "ip-accounting-egress-bytes",
3205 [CGROUP_IP_EGRESS_PACKETS
] = "ip-accounting-egress-packets",
3208 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
, bool serialize_jobs
) {
3209 CGroupIPAccountingMetric m
;
3216 if (unit_can_serialize(u
)) {
3217 r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
);
3222 (void) serialize_dual_timestamp(f
, "state-change-timestamp", &u
->state_change_timestamp
);
3224 (void) serialize_dual_timestamp(f
, "inactive-exit-timestamp", &u
->inactive_exit_timestamp
);
3225 (void) serialize_dual_timestamp(f
, "active-enter-timestamp", &u
->active_enter_timestamp
);
3226 (void) serialize_dual_timestamp(f
, "active-exit-timestamp", &u
->active_exit_timestamp
);
3227 (void) serialize_dual_timestamp(f
, "inactive-enter-timestamp", &u
->inactive_enter_timestamp
);
3229 (void) serialize_dual_timestamp(f
, "condition-timestamp", &u
->condition_timestamp
);
3230 (void) serialize_dual_timestamp(f
, "assert-timestamp", &u
->assert_timestamp
);
3232 if (dual_timestamp_is_set(&u
->condition_timestamp
))
3233 (void) serialize_bool(f
, "condition-result", u
->condition_result
);
3235 if (dual_timestamp_is_set(&u
->assert_timestamp
))
3236 (void) serialize_bool(f
, "assert-result", u
->assert_result
);
3238 (void) serialize_bool(f
, "transient", u
->transient
);
3239 (void) serialize_bool(f
, "in-audit", u
->in_audit
);
3241 (void) serialize_bool(f
, "exported-invocation-id", u
->exported_invocation_id
);
3242 (void) serialize_bool(f
, "exported-log-level-max", u
->exported_log_level_max
);
3243 (void) serialize_bool(f
, "exported-log-extra-fields", u
->exported_log_extra_fields
);
3244 (void) serialize_bool(f
, "exported-log-rate-limit-interval", u
->exported_log_rate_limit_interval
);
3245 (void) serialize_bool(f
, "exported-log-rate-limit-burst", u
->exported_log_rate_limit_burst
);
3247 (void) serialize_item_format(f
, "cpu-usage-base", "%" PRIu64
, u
->cpu_usage_base
);
3248 if (u
->cpu_usage_last
!= NSEC_INFINITY
)
3249 (void) serialize_item_format(f
, "cpu-usage-last", "%" PRIu64
, u
->cpu_usage_last
);
3252 (void) serialize_item(f
, "cgroup", u
->cgroup_path
);
3254 (void) serialize_bool(f
, "cgroup-realized", u
->cgroup_realized
);
3255 (void) serialize_cgroup_mask(f
, "cgroup-realized-mask", u
->cgroup_realized_mask
);
3256 (void) serialize_cgroup_mask(f
, "cgroup-enabled-mask", u
->cgroup_enabled_mask
);
3257 (void) serialize_cgroup_mask(f
, "cgroup-invalidated-mask", u
->cgroup_invalidated_mask
);
3259 if (uid_is_valid(u
->ref_uid
))
3260 (void) serialize_item_format(f
, "ref-uid", UID_FMT
, u
->ref_uid
);
3261 if (gid_is_valid(u
->ref_gid
))
3262 (void) serialize_item_format(f
, "ref-gid", GID_FMT
, u
->ref_gid
);
3264 if (!sd_id128_is_null(u
->invocation_id
))
3265 (void) serialize_item_format(f
, "invocation-id", SD_ID128_FORMAT_STR
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
3267 bus_track_serialize(u
->bus_track
, f
, "ref");
3269 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
3272 r
= unit_get_ip_accounting(u
, m
, &v
);
3274 (void) serialize_item_format(f
, ip_accounting_metric_field
[m
], "%" PRIu64
, v
);
3277 if (serialize_jobs
) {
3280 job_serialize(u
->job
, f
);
3285 job_serialize(u
->nop_job
, f
);
3294 static int unit_deserialize_job(Unit
*u
, FILE *f
) {
3295 _cleanup_(job_freep
) Job
*j
= NULL
;
3305 r
= job_deserialize(j
, f
);
3309 r
= job_install_deserialized(j
);
3317 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
3325 _cleanup_free_
char *line
= NULL
;
3326 CGroupIPAccountingMetric m
;
3330 r
= read_line(f
, LONG_LINE_MAX
, &line
);
3332 return log_error_errno(r
, "Failed to read serialization line: %m");
3333 if (r
== 0) /* eof */
3337 if (isempty(l
)) /* End marker */
3340 k
= strcspn(l
, "=");
3348 if (streq(l
, "job")) {
3350 /* New-style serialized job */
3351 r
= unit_deserialize_job(u
, f
);
3354 } else /* Legacy for pre-44 */
3355 log_unit_warning(u
, "Update from too old systemd versions are unsupported, cannot deserialize job: %s", v
);
3357 } else if (streq(l
, "state-change-timestamp")) {
3358 (void) deserialize_dual_timestamp(v
, &u
->state_change_timestamp
);
3360 } else if (streq(l
, "inactive-exit-timestamp")) {
3361 (void) deserialize_dual_timestamp(v
, &u
->inactive_exit_timestamp
);
3363 } else if (streq(l
, "active-enter-timestamp")) {
3364 (void) deserialize_dual_timestamp(v
, &u
->active_enter_timestamp
);
3366 } else if (streq(l
, "active-exit-timestamp")) {
3367 (void) deserialize_dual_timestamp(v
, &u
->active_exit_timestamp
);
3369 } else if (streq(l
, "inactive-enter-timestamp")) {
3370 (void) deserialize_dual_timestamp(v
, &u
->inactive_enter_timestamp
);
3372 } else if (streq(l
, "condition-timestamp")) {
3373 (void) deserialize_dual_timestamp(v
, &u
->condition_timestamp
);
3375 } else if (streq(l
, "assert-timestamp")) {
3376 (void) deserialize_dual_timestamp(v
, &u
->assert_timestamp
);
3378 } else if (streq(l
, "condition-result")) {
3380 r
= parse_boolean(v
);
3382 log_unit_debug(u
, "Failed to parse condition result value %s, ignoring.", v
);
3384 u
->condition_result
= r
;
3388 } else if (streq(l
, "assert-result")) {
3390 r
= parse_boolean(v
);
3392 log_unit_debug(u
, "Failed to parse assert result value %s, ignoring.", v
);
3394 u
->assert_result
= r
;
3398 } else if (streq(l
, "transient")) {
3400 r
= parse_boolean(v
);
3402 log_unit_debug(u
, "Failed to parse transient bool %s, ignoring.", v
);
3408 } else if (streq(l
, "in-audit")) {
3410 r
= parse_boolean(v
);
3412 log_unit_debug(u
, "Failed to parse in-audit bool %s, ignoring.", v
);
3418 } else if (streq(l
, "exported-invocation-id")) {
3420 r
= parse_boolean(v
);
3422 log_unit_debug(u
, "Failed to parse exported invocation ID bool %s, ignoring.", v
);
3424 u
->exported_invocation_id
= r
;
3428 } else if (streq(l
, "exported-log-level-max")) {
3430 r
= parse_boolean(v
);
3432 log_unit_debug(u
, "Failed to parse exported log level max bool %s, ignoring.", v
);
3434 u
->exported_log_level_max
= r
;
3438 } else if (streq(l
, "exported-log-extra-fields")) {
3440 r
= parse_boolean(v
);
3442 log_unit_debug(u
, "Failed to parse exported log extra fields bool %s, ignoring.", v
);
3444 u
->exported_log_extra_fields
= r
;
3448 } else if (streq(l
, "exported-log-rate-limit-interval")) {
3450 r
= parse_boolean(v
);
3452 log_unit_debug(u
, "Failed to parse exported log rate limit interval %s, ignoring.", v
);
3454 u
->exported_log_rate_limit_interval
= r
;
3458 } else if (streq(l
, "exported-log-rate-limit-burst")) {
3460 r
= parse_boolean(v
);
3462 log_unit_debug(u
, "Failed to parse exported log rate limit burst %s, ignoring.", v
);
3464 u
->exported_log_rate_limit_burst
= r
;
3468 } else if (STR_IN_SET(l
, "cpu-usage-base", "cpuacct-usage-base")) {
3470 r
= safe_atou64(v
, &u
->cpu_usage_base
);
3472 log_unit_debug(u
, "Failed to parse CPU usage base %s, ignoring.", v
);
3476 } else if (streq(l
, "cpu-usage-last")) {
3478 r
= safe_atou64(v
, &u
->cpu_usage_last
);
3480 log_unit_debug(u
, "Failed to read CPU usage last %s, ignoring.", v
);
3484 } else if (streq(l
, "cgroup")) {
3486 r
= unit_set_cgroup_path(u
, v
);
3488 log_unit_debug_errno(u
, r
, "Failed to set cgroup path %s, ignoring: %m", v
);
3490 (void) unit_watch_cgroup(u
);
3493 } else if (streq(l
, "cgroup-realized")) {
3496 b
= parse_boolean(v
);
3498 log_unit_debug(u
, "Failed to parse cgroup-realized bool %s, ignoring.", v
);
3500 u
->cgroup_realized
= b
;
3504 } else if (streq(l
, "cgroup-realized-mask")) {
3506 r
= cg_mask_from_string(v
, &u
->cgroup_realized_mask
);
3508 log_unit_debug(u
, "Failed to parse cgroup-realized-mask %s, ignoring.", v
);
3511 } else if (streq(l
, "cgroup-enabled-mask")) {
3513 r
= cg_mask_from_string(v
, &u
->cgroup_enabled_mask
);
3515 log_unit_debug(u
, "Failed to parse cgroup-enabled-mask %s, ignoring.", v
);
3518 } else if (streq(l
, "cgroup-invalidated-mask")) {
3520 r
= cg_mask_from_string(v
, &u
->cgroup_invalidated_mask
);
3522 log_unit_debug(u
, "Failed to parse cgroup-invalidated-mask %s, ignoring.", v
);
3525 } else if (streq(l
, "ref-uid")) {
3528 r
= parse_uid(v
, &uid
);
3530 log_unit_debug(u
, "Failed to parse referenced UID %s, ignoring.", v
);
3532 unit_ref_uid_gid(u
, uid
, GID_INVALID
);
3536 } else if (streq(l
, "ref-gid")) {
3539 r
= parse_gid(v
, &gid
);
3541 log_unit_debug(u
, "Failed to parse referenced GID %s, ignoring.", v
);
3543 unit_ref_uid_gid(u
, UID_INVALID
, gid
);
3547 } else if (streq(l
, "ref")) {
3549 r
= strv_extend(&u
->deserialized_refs
, v
);
3554 } else if (streq(l
, "invocation-id")) {
3557 r
= sd_id128_from_string(v
, &id
);
3559 log_unit_debug(u
, "Failed to parse invocation id %s, ignoring.", v
);
3561 r
= unit_set_invocation_id(u
, id
);
3563 log_unit_warning_errno(u
, r
, "Failed to set invocation ID for unit: %m");
3569 /* Check if this is an IP accounting metric serialization field */
3570 for (m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++)
3571 if (streq(l
, ip_accounting_metric_field
[m
]))
3573 if (m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
) {
3576 r
= safe_atou64(v
, &c
);
3578 log_unit_debug(u
, "Failed to parse IP accounting value %s, ignoring.", v
);
3580 u
->ip_accounting_extra
[m
] = c
;
3584 if (unit_can_serialize(u
)) {
3585 r
= exec_runtime_deserialize_compat(u
, l
, v
, fds
);
3587 log_unit_warning(u
, "Failed to deserialize runtime parameter '%s', ignoring.", l
);
3591 /* Returns positive if key was handled by the call */
3595 r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
);
3597 log_unit_warning(u
, "Failed to deserialize unit parameter '%s', ignoring.", l
);
3601 /* Versions before 228 did not carry a state change timestamp. In this case, take the current time. This is
3602 * useful, so that timeouts based on this timestamp don't trigger too early, and is in-line with the logic from
3603 * before 228 where the base for timeouts was not persistent across reboots. */
3605 if (!dual_timestamp_is_set(&u
->state_change_timestamp
))
3606 dual_timestamp_get(&u
->state_change_timestamp
);
3608 /* Let's make sure that everything that is deserialized also gets any potential new cgroup settings applied
3609 * after we are done. For that we invalidate anything already realized, so that we can realize it again. */
3610 unit_invalidate_cgroup(u
, _CGROUP_MASK_ALL
);
3611 unit_invalidate_cgroup_bpf(u
);
3616 int unit_deserialize_skip(FILE *f
) {
3620 /* Skip serialized data for this unit. We don't know what it is. */
3623 _cleanup_free_
char *line
= NULL
;
3626 r
= read_line(f
, LONG_LINE_MAX
, &line
);
3628 return log_error_errno(r
, "Failed to read serialization line: %m");
3640 int unit_add_node_dependency(Unit
*u
, const char *what
, bool wants
, UnitDependency dep
, UnitDependencyMask mask
) {
3642 _cleanup_free_
char *e
= NULL
;
3647 /* Adds in links to the device node that this unit is based on */
3651 if (!is_device_path(what
))
3654 /* When device units aren't supported (such as in a
3655 * container), don't create dependencies on them. */
3656 if (!unit_type_supported(UNIT_DEVICE
))
3659 r
= unit_name_from_path(what
, ".device", &e
);
3663 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3667 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3668 dep
= UNIT_BINDS_TO
;
3670 r
= unit_add_two_dependencies(u
, UNIT_AFTER
,
3671 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3672 device
, true, mask
);
3677 r
= unit_add_dependency(device
, UNIT_WANTS
, u
, false, mask
);
3685 int unit_coldplug(Unit
*u
) {
3691 /* Make sure we don't enter a loop, when coldplugging recursively. */
3695 u
->coldplugged
= true;
3697 STRV_FOREACH(i
, u
->deserialized_refs
) {
3698 q
= bus_unit_track_add_name(u
, *i
);
3699 if (q
< 0 && r
>= 0)
3702 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3704 if (UNIT_VTABLE(u
)->coldplug
) {
3705 q
= UNIT_VTABLE(u
)->coldplug(u
);
3706 if (q
< 0 && r
>= 0)
3711 q
= job_coldplug(u
->job
);
3712 if (q
< 0 && r
>= 0)
3719 void unit_catchup(Unit
*u
) {
3722 if (UNIT_VTABLE(u
)->catchup
)
3723 UNIT_VTABLE(u
)->catchup(u
);
3726 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3732 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3733 * are never out-of-date. */
3734 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3737 if (stat(path
, &st
) < 0)
3738 /* What, cannot access this anymore? */
3742 /* For masked files check if they are still so */
3743 return !null_or_empty(&st
);
3745 /* For non-empty files check the mtime */
3746 return timespec_load(&st
.st_mtim
) > mtime
;
3751 bool unit_need_daemon_reload(Unit
*u
) {
3752 _cleanup_strv_free_
char **t
= NULL
;
3757 /* For unit files, we allow masking… */
3758 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3759 u
->load_state
== UNIT_MASKED
))
3762 /* Source paths should not be masked… */
3763 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3766 if (u
->load_state
== UNIT_LOADED
)
3767 (void) unit_find_dropin_paths(u
, &t
);
3768 if (!strv_equal(u
->dropin_paths
, t
))
3771 /* … any drop-ins that are masked are simply omitted from the list. */
3772 STRV_FOREACH(path
, u
->dropin_paths
)
3773 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3779 void unit_reset_failed(Unit
*u
) {
3782 if (UNIT_VTABLE(u
)->reset_failed
)
3783 UNIT_VTABLE(u
)->reset_failed(u
);
3785 RATELIMIT_RESET(u
->start_limit
);
3786 u
->start_limit_hit
= false;
3789 Unit
*unit_following(Unit
*u
) {
3792 if (UNIT_VTABLE(u
)->following
)
3793 return UNIT_VTABLE(u
)->following(u
);
3798 bool unit_stop_pending(Unit
*u
) {
3801 /* This call does check the current state of the unit. It's
3802 * hence useful to be called from state change calls of the
3803 * unit itself, where the state isn't updated yet. This is
3804 * different from unit_inactive_or_pending() which checks both
3805 * the current state and for a queued job. */
3807 return u
->job
&& u
->job
->type
== JOB_STOP
;
3810 bool unit_inactive_or_pending(Unit
*u
) {
3813 /* Returns true if the unit is inactive or going down */
3815 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3818 if (unit_stop_pending(u
))
3824 bool unit_active_or_pending(Unit
*u
) {
3827 /* Returns true if the unit is active or going up */
3829 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3833 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3839 bool unit_will_restart(Unit
*u
) {
3842 if (!UNIT_VTABLE(u
)->will_restart
)
3845 return UNIT_VTABLE(u
)->will_restart(u
);
3848 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3850 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3851 assert(SIGNAL_VALID(signo
));
3853 if (!UNIT_VTABLE(u
)->kill
)
3856 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3859 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3860 _cleanup_set_free_ Set
*pid_set
= NULL
;
3863 pid_set
= set_new(NULL
);
3867 /* Exclude the main/control pids from being killed via the cgroup */
3869 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3874 if (control_pid
> 0) {
3875 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3880 return TAKE_PTR(pid_set
);
3883 int unit_kill_common(
3889 sd_bus_error
*error
) {
3892 bool killed
= false;
3894 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3896 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3897 else if (main_pid
== 0)
3898 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3901 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3902 if (control_pid
< 0)
3903 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3904 else if (control_pid
== 0)
3905 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3908 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3909 if (control_pid
> 0) {
3910 if (kill(control_pid
, signo
) < 0)
3916 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3918 if (kill(main_pid
, signo
) < 0)
3924 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3925 _cleanup_set_free_ Set
*pid_set
= NULL
;
3928 /* Exclude the main/control pids from being killed via the cgroup */
3929 pid_set
= unit_pid_set(main_pid
, control_pid
);
3933 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, NULL
, NULL
);
3934 if (q
< 0 && !IN_SET(q
, -EAGAIN
, -ESRCH
, -ENOENT
))
3940 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
))
3946 int unit_following_set(Unit
*u
, Set
**s
) {
3950 if (UNIT_VTABLE(u
)->following_set
)
3951 return UNIT_VTABLE(u
)->following_set(u
, s
);
3957 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3962 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3963 r
= unit_file_get_state(
3964 u
->manager
->unit_file_scope
,
3967 &u
->unit_file_state
);
3969 u
->unit_file_state
= UNIT_FILE_BAD
;
3972 return u
->unit_file_state
;
3975 int unit_get_unit_file_preset(Unit
*u
) {
3978 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3979 u
->unit_file_preset
= unit_file_query_preset(
3980 u
->manager
->unit_file_scope
,
3982 basename(u
->fragment_path
));
3984 return u
->unit_file_preset
;
3987 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
3993 unit_ref_unset(ref
);
3995 ref
->source
= source
;
3996 ref
->target
= target
;
3997 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
4001 void unit_ref_unset(UnitRef
*ref
) {
4007 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
4008 * be unreferenced now. */
4009 unit_add_to_gc_queue(ref
->target
);
4011 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
4012 ref
->source
= ref
->target
= NULL
;
4015 static int user_from_unit_name(Unit
*u
, char **ret
) {
4017 static const uint8_t hash_key
[] = {
4018 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4019 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4022 _cleanup_free_
char *n
= NULL
;
4025 r
= unit_name_to_prefix(u
->id
, &n
);
4029 if (valid_user_group_name(n
)) {
4034 /* If we can't use the unit name as a user name, then let's hash it and use that */
4035 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4041 int unit_patch_contexts(Unit
*u
) {
4049 /* Patch in the manager defaults into the exec and cgroup
4050 * contexts, _after_ the rest of the settings have been
4053 ec
= unit_get_exec_context(u
);
4055 /* This only copies in the ones that need memory */
4056 for (i
= 0; i
< _RLIMIT_MAX
; i
++)
4057 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4058 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4063 if (MANAGER_IS_USER(u
->manager
) &&
4064 !ec
->working_directory
) {
4066 r
= get_home_dir(&ec
->working_directory
);
4070 /* Allow user services to run, even if the
4071 * home directory is missing */
4072 ec
->working_directory_missing_ok
= true;
4075 if (ec
->private_devices
)
4076 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4078 if (ec
->protect_kernel_modules
)
4079 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4081 if (ec
->dynamic_user
) {
4083 r
= user_from_unit_name(u
, &ec
->user
);
4089 ec
->group
= strdup(ec
->user
);
4094 /* If the dynamic user option is on, let's make sure that the unit can't leave its UID/GID
4095 * around in the file system or on IPC objects. Hence enforce a strict sandbox. */
4097 ec
->private_tmp
= true;
4098 ec
->remove_ipc
= true;
4099 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4100 if (ec
->protect_home
== PROTECT_HOME_NO
)
4101 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4105 cc
= unit_get_cgroup_context(u
);
4108 if (ec
->private_devices
&&
4109 cc
->device_policy
== CGROUP_AUTO
)
4110 cc
->device_policy
= CGROUP_CLOSED
;
4112 if (ec
->root_image
&&
4113 (cc
->device_policy
!= CGROUP_AUTO
|| cc
->device_allow
)) {
4115 /* When RootImage= is specified, the following devices are touched. */
4116 r
= cgroup_add_device_allow(cc
, "/dev/loop-control", "rw");
4120 r
= cgroup_add_device_allow(cc
, "block-loop", "rwm");
4124 r
= cgroup_add_device_allow(cc
, "block-blkext", "rwm");
4133 ExecContext
*unit_get_exec_context(Unit
*u
) {
4140 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4144 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4147 KillContext
*unit_get_kill_context(Unit
*u
) {
4154 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4158 return (KillContext
*) ((uint8_t*) u
+ offset
);
4161 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4167 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4171 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4174 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4180 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4184 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4187 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4190 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4193 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4194 return u
->manager
->lookup_paths
.transient
;
4196 if (flags
& UNIT_PERSISTENT
)
4197 return u
->manager
->lookup_paths
.persistent_control
;
4199 if (flags
& UNIT_RUNTIME
)
4200 return u
->manager
->lookup_paths
.runtime_control
;
4205 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4211 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4212 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4213 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4214 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4215 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4218 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4219 ret
= specifier_escape(s
);
4226 if (flags
& UNIT_ESCAPE_C
) {
4239 return ret
?: (char*) s
;
4242 return ret
?: strdup(s
);
4245 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4246 _cleanup_free_
char *result
= NULL
;
4247 size_t n
= 0, allocated
= 0;
4250 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4251 * way suitable for ExecStart= stanzas */
4253 STRV_FOREACH(i
, l
) {
4254 _cleanup_free_
char *buf
= NULL
;
4259 p
= unit_escape_setting(*i
, flags
, &buf
);
4263 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4264 if (!GREEDY_REALLOC(result
, allocated
, n
+ a
+ 1))
4278 if (!GREEDY_REALLOC(result
, allocated
, n
+ 1))
4283 return TAKE_PTR(result
);
4286 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4287 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4288 const char *dir
, *wrapped
;
4295 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4298 data
= unit_escape_setting(data
, flags
, &escaped
);
4302 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4303 * previous section header is the same */
4305 if (flags
& UNIT_PRIVATE
) {
4306 if (!UNIT_VTABLE(u
)->private_section
)
4309 if (!u
->transient_file
|| u
->last_section_private
< 0)
4310 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4311 else if (u
->last_section_private
== 0)
4312 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4314 if (!u
->transient_file
|| u
->last_section_private
< 0)
4315 data
= strjoina("[Unit]\n", data
);
4316 else if (u
->last_section_private
> 0)
4317 data
= strjoina("\n[Unit]\n", data
);
4320 if (u
->transient_file
) {
4321 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4322 * write to the transient unit file. */
4323 fputs(data
, u
->transient_file
);
4325 if (!endswith(data
, "\n"))
4326 fputc('\n', u
->transient_file
);
4328 /* Remember which section we wrote this entry to */
4329 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4333 dir
= unit_drop_in_dir(u
, flags
);
4337 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4338 "# or an equivalent operation. Do not edit.\n",
4342 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4346 (void) mkdir_p_label(p
, 0755);
4347 r
= write_string_file_atomic_label(q
, wrapped
);
4351 r
= strv_push(&u
->dropin_paths
, q
);
4356 strv_uniq(u
->dropin_paths
);
4358 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4363 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4364 _cleanup_free_
char *p
= NULL
;
4372 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4375 va_start(ap
, format
);
4376 r
= vasprintf(&p
, format
, ap
);
4382 return unit_write_setting(u
, flags
, name
, p
);
4385 int unit_make_transient(Unit
*u
) {
4386 _cleanup_free_
char *path
= NULL
;
4391 if (!UNIT_VTABLE(u
)->can_transient
)
4394 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4396 path
= strjoin(u
->manager
->lookup_paths
.transient
, "/", u
->id
);
4400 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4401 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4403 RUN_WITH_UMASK(0022) {
4404 f
= fopen(path
, "we");
4409 safe_fclose(u
->transient_file
);
4410 u
->transient_file
= f
;
4412 free_and_replace(u
->fragment_path
, path
);
4414 u
->source_path
= mfree(u
->source_path
);
4415 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4416 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4418 u
->load_state
= UNIT_STUB
;
4420 u
->transient
= true;
4422 unit_add_to_dbus_queue(u
);
4423 unit_add_to_gc_queue(u
);
4425 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4431 static void log_kill(pid_t pid
, int sig
, void *userdata
) {
4432 _cleanup_free_
char *comm
= NULL
;
4434 (void) get_process_comm(pid
, &comm
);
4436 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4437 only, like for example systemd's own PAM stub process. */
4438 if (comm
&& comm
[0] == '(')
4441 log_unit_notice(userdata
,
4442 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4445 signal_to_string(sig
));
4448 static int operation_to_signal(KillContext
*c
, KillOperation k
) {
4453 case KILL_TERMINATE
:
4454 case KILL_TERMINATE_AND_LOG
:
4455 return c
->kill_signal
;
4458 return c
->final_kill_signal
;
4461 return c
->watchdog_signal
;
4464 assert_not_reached("KillOperation unknown");
4468 int unit_kill_context(
4474 bool main_pid_alien
) {
4476 bool wait_for_exit
= false, send_sighup
;
4477 cg_kill_log_func_t log_func
= NULL
;
4483 /* Kill the processes belonging to this unit, in preparation for shutting the unit down.
4484 * Returns > 0 if we killed something worth waiting for, 0 otherwise. */
4486 if (c
->kill_mode
== KILL_NONE
)
4489 sig
= operation_to_signal(c
, k
);
4493 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4496 if (k
!= KILL_TERMINATE
|| IN_SET(sig
, SIGKILL
, SIGABRT
))
4497 log_func
= log_kill
;
4501 log_func(main_pid
, sig
, u
);
4503 r
= kill_and_sigcont(main_pid
, sig
);
4504 if (r
< 0 && r
!= -ESRCH
) {
4505 _cleanup_free_
char *comm
= NULL
;
4506 (void) get_process_comm(main_pid
, &comm
);
4508 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4510 if (!main_pid_alien
)
4511 wait_for_exit
= true;
4513 if (r
!= -ESRCH
&& send_sighup
)
4514 (void) kill(main_pid
, SIGHUP
);
4518 if (control_pid
> 0) {
4520 log_func(control_pid
, sig
, u
);
4522 r
= kill_and_sigcont(control_pid
, sig
);
4523 if (r
< 0 && r
!= -ESRCH
) {
4524 _cleanup_free_
char *comm
= NULL
;
4525 (void) get_process_comm(control_pid
, &comm
);
4527 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4529 wait_for_exit
= true;
4531 if (r
!= -ESRCH
&& send_sighup
)
4532 (void) kill(control_pid
, SIGHUP
);
4536 if (u
->cgroup_path
&&
4537 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4538 _cleanup_set_free_ Set
*pid_set
= NULL
;
4540 /* Exclude the main/control pids from being killed via the cgroup */
4541 pid_set
= unit_pid_set(main_pid
, control_pid
);
4545 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4547 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4551 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4552 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
4556 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4557 * we are running in a container or if this is a delegation unit, simply because cgroup
4558 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4559 * of containers it can be confused easily by left-over directories in the cgroup — which
4560 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4561 * there we get proper events. Hence rely on them. */
4563 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4564 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4565 wait_for_exit
= true;
4570 pid_set
= unit_pid_set(main_pid
, control_pid
);
4574 cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4583 return wait_for_exit
;
4586 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4587 _cleanup_free_
char *p
= NULL
;
4588 UnitDependencyInfo di
;
4594 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these paths in
4595 * the unit (from the path to the UnitDependencyInfo structure indicating how to the dependency came to
4596 * be). However, we build a prefix table for all possible prefixes so that new appearing mount units can easily
4597 * determine which units to make themselves a dependency of. */
4599 if (!path_is_absolute(path
))
4602 r
= hashmap_ensure_allocated(&u
->requires_mounts_for
, &path_hash_ops
);
4610 path
= path_simplify(p
, false);
4612 if (!path_is_normalized(path
))
4615 if (hashmap_contains(u
->requires_mounts_for
, path
))
4618 di
= (UnitDependencyInfo
) {
4622 r
= hashmap_put(u
->requires_mounts_for
, path
, di
.data
);
4627 char prefix
[strlen(path
) + 1];
4628 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4631 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4633 _cleanup_free_
char *q
= NULL
;
4635 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4647 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4663 int unit_setup_exec_runtime(Unit
*u
) {
4671 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4674 /* Check if there already is an ExecRuntime for this unit? */
4675 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4679 /* Try to get it from somebody else */
4680 HASHMAP_FOREACH_KEY(v
, other
, u
->dependencies
[UNIT_JOINS_NAMESPACE_OF
], i
) {
4681 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4686 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4689 int unit_setup_dynamic_creds(Unit
*u
) {
4691 DynamicCreds
*dcreds
;
4696 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4698 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4700 ec
= unit_get_exec_context(u
);
4703 if (!ec
->dynamic_user
)
4706 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4709 bool unit_type_supported(UnitType t
) {
4710 if (_unlikely_(t
< 0))
4712 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4715 if (!unit_vtable
[t
]->supported
)
4718 return unit_vtable
[t
]->supported();
4721 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4727 r
= dir_is_empty(where
);
4728 if (r
> 0 || r
== -ENOTDIR
)
4731 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4735 log_struct(LOG_NOTICE
,
4736 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4738 LOG_UNIT_INVOCATION_ID(u
),
4739 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4743 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4744 _cleanup_free_
char *canonical_where
= NULL
;
4750 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
);
4752 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4756 /* We will happily ignore a trailing slash (or any redundant slashes) */
4757 if (path_equal(where
, canonical_where
))
4760 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4762 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4764 LOG_UNIT_INVOCATION_ID(u
),
4765 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4771 bool unit_is_pristine(Unit
*u
) {
4774 /* Check if the unit already exists or is already around,
4775 * in a number of different ways. Note that to cater for unit
4776 * types such as slice, we are generally fine with units that
4777 * are marked UNIT_LOADED even though nothing was actually
4778 * loaded, as those unit types don't require a file on disk. */
4780 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4783 !strv_isempty(u
->dropin_paths
) ||
4788 pid_t
unit_control_pid(Unit
*u
) {
4791 if (UNIT_VTABLE(u
)->control_pid
)
4792 return UNIT_VTABLE(u
)->control_pid(u
);
4797 pid_t
unit_main_pid(Unit
*u
) {
4800 if (UNIT_VTABLE(u
)->main_pid
)
4801 return UNIT_VTABLE(u
)->main_pid(u
);
4806 static void unit_unref_uid_internal(
4810 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4814 assert(_manager_unref_uid
);
4816 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4817 * gid_t are actually the same time, with the same validity rules.
4819 * Drops a reference to UID/GID from a unit. */
4821 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4822 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4824 if (!uid_is_valid(*ref_uid
))
4827 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4828 *ref_uid
= UID_INVALID
;
4831 void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4832 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4835 void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4836 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4839 static int unit_ref_uid_internal(
4844 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4850 assert(uid_is_valid(uid
));
4851 assert(_manager_ref_uid
);
4853 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4854 * are actually the same type, and have the same validity rules.
4856 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4857 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4860 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4861 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4863 if (*ref_uid
== uid
)
4866 if (uid_is_valid(*ref_uid
)) /* Already set? */
4869 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4877 int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4878 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4881 int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4882 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4885 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4890 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4892 if (uid_is_valid(uid
)) {
4893 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4898 if (gid_is_valid(gid
)) {
4899 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4902 unit_unref_uid(u
, false);
4908 return r
> 0 || q
> 0;
4911 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4917 c
= unit_get_exec_context(u
);
4919 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4921 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4926 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4929 unit_unref_uid(u
, destroy_now
);
4930 unit_unref_gid(u
, destroy_now
);
4933 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4938 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4939 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4940 * objects when no service references the UID/GID anymore. */
4942 r
= unit_ref_uid_gid(u
, uid
, gid
);
4944 unit_add_to_dbus_queue(u
);
4947 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
4952 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
4954 if (sd_id128_equal(u
->invocation_id
, id
))
4957 if (!sd_id128_is_null(u
->invocation_id
))
4958 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4960 if (sd_id128_is_null(id
)) {
4965 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
4969 u
->invocation_id
= id
;
4970 sd_id128_to_string(id
, u
->invocation_id_string
);
4972 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4979 u
->invocation_id
= SD_ID128_NULL
;
4980 u
->invocation_id_string
[0] = 0;
4984 int unit_acquire_invocation_id(Unit
*u
) {
4990 r
= sd_id128_randomize(&id
);
4992 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
4994 r
= unit_set_invocation_id(u
, id
);
4996 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
4998 unit_add_to_dbus_queue(u
);
5002 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
5008 /* Copy parameters from manager */
5009 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
5013 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
5014 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
5015 p
->prefix
= u
->manager
->prefix
;
5016 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
5018 /* Copy paramaters from unit */
5019 p
->cgroup_path
= u
->cgroup_path
;
5020 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
5025 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
5031 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5032 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5034 (void) unit_realize_cgroup(u
);
5036 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5040 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
, -1);
5041 (void) ignore_signals(SIGPIPE
, -1);
5043 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5045 if (u
->cgroup_path
) {
5046 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5048 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", u
->cgroup_path
);
5056 static void unit_update_dependency_mask(Unit
*u
, UnitDependency d
, Unit
*other
, UnitDependencyInfo di
) {
5059 assert(d
< _UNIT_DEPENDENCY_MAX
);
5062 if (di
.origin_mask
== 0 && di
.destination_mask
== 0) {
5063 /* No bit set anymore, let's drop the whole entry */
5064 assert_se(hashmap_remove(u
->dependencies
[d
], other
));
5065 log_unit_debug(u
, "%s lost dependency %s=%s", u
->id
, unit_dependency_to_string(d
), other
->id
);
5067 /* Mask was reduced, let's update the entry */
5068 assert_se(hashmap_update(u
->dependencies
[d
], other
, di
.data
) == 0);
5071 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5076 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5081 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
5085 UnitDependencyInfo di
;
5091 HASHMAP_FOREACH_KEY(di
.data
, other
, u
->dependencies
[d
], i
) {
5094 if ((di
.origin_mask
& ~mask
) == di
.origin_mask
)
5096 di
.origin_mask
&= ~mask
;
5097 unit_update_dependency_mask(u
, d
, other
, di
);
5099 /* We updated the dependency from our unit to the other unit now. But most dependencies
5100 * imply a reverse dependency. Hence, let's delete that one too. For that we go through
5101 * all dependency types on the other unit and delete all those which point to us and
5102 * have the right mask set. */
5104 for (q
= 0; q
< _UNIT_DEPENDENCY_MAX
; q
++) {
5105 UnitDependencyInfo dj
;
5107 dj
.data
= hashmap_get(other
->dependencies
[q
], u
);
5108 if ((dj
.destination_mask
& ~mask
) == dj
.destination_mask
)
5110 dj
.destination_mask
&= ~mask
;
5112 unit_update_dependency_mask(other
, q
, u
, dj
);
5115 unit_add_to_gc_queue(other
);
5125 static int unit_export_invocation_id(Unit
*u
) {
5131 if (u
->exported_invocation_id
)
5134 if (sd_id128_is_null(u
->invocation_id
))
5137 p
= strjoina("/run/systemd/units/invocation:", u
->id
);
5138 r
= symlink_atomic(u
->invocation_id_string
, p
);
5140 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5142 u
->exported_invocation_id
= true;
5146 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5154 if (u
->exported_log_level_max
)
5157 if (c
->log_level_max
< 0)
5160 assert(c
->log_level_max
<= 7);
5162 buf
[0] = '0' + c
->log_level_max
;
5165 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5166 r
= symlink_atomic(buf
, p
);
5168 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5170 u
->exported_log_level_max
= true;
5174 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5175 _cleanup_close_
int fd
= -1;
5176 struct iovec
*iovec
;
5184 if (u
->exported_log_extra_fields
)
5187 if (c
->n_log_extra_fields
<= 0)
5190 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5191 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5193 for (i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5194 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5196 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5197 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5200 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5201 pattern
= strjoina(p
, ".XXXXXX");
5203 fd
= mkostemp_safe(pattern
);
5205 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5207 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5209 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5213 (void) fchmod(fd
, 0644);
5215 if (rename(pattern
, p
) < 0) {
5216 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5220 u
->exported_log_extra_fields
= true;
5224 (void) unlink(pattern
);
5228 static int unit_export_log_rate_limit_interval(Unit
*u
, const ExecContext
*c
) {
5229 _cleanup_free_
char *buf
= NULL
;
5236 if (u
->exported_log_rate_limit_interval
)
5239 if (c
->log_rate_limit_interval_usec
== 0)
5242 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5244 if (asprintf(&buf
, "%" PRIu64
, c
->log_rate_limit_interval_usec
) < 0)
5247 r
= symlink_atomic(buf
, p
);
5249 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5251 u
->exported_log_rate_limit_interval
= true;
5255 static int unit_export_log_rate_limit_burst(Unit
*u
, const ExecContext
*c
) {
5256 _cleanup_free_
char *buf
= NULL
;
5263 if (u
->exported_log_rate_limit_burst
)
5266 if (c
->log_rate_limit_burst
== 0)
5269 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5271 if (asprintf(&buf
, "%u", c
->log_rate_limit_burst
) < 0)
5274 r
= symlink_atomic(buf
, p
);
5276 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5278 u
->exported_log_rate_limit_burst
= true;
5282 void unit_export_state_files(Unit
*u
) {
5283 const ExecContext
*c
;
5290 if (!MANAGER_IS_SYSTEM(u
->manager
))
5293 if (MANAGER_IS_TEST_RUN(u
->manager
))
5296 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5297 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5298 * the IPC system itself and PID 1 also log to the journal.
5300 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5301 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5302 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5303 * namespace at least.
5305 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5306 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5309 (void) unit_export_invocation_id(u
);
5311 c
= unit_get_exec_context(u
);
5313 (void) unit_export_log_level_max(u
, c
);
5314 (void) unit_export_log_extra_fields(u
, c
);
5315 (void) unit_export_log_rate_limit_interval(u
, c
);
5316 (void) unit_export_log_rate_limit_burst(u
, c
);
5320 void unit_unlink_state_files(Unit
*u
) {
5328 if (!MANAGER_IS_SYSTEM(u
->manager
))
5331 /* Undoes the effect of unit_export_state() */
5333 if (u
->exported_invocation_id
) {
5334 p
= strjoina("/run/systemd/units/invocation:", u
->id
);
5337 u
->exported_invocation_id
= false;
5340 if (u
->exported_log_level_max
) {
5341 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5344 u
->exported_log_level_max
= false;
5347 if (u
->exported_log_extra_fields
) {
5348 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5351 u
->exported_log_extra_fields
= false;
5354 if (u
->exported_log_rate_limit_interval
) {
5355 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5358 u
->exported_log_rate_limit_interval
= false;
5361 if (u
->exported_log_rate_limit_burst
) {
5362 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5365 u
->exported_log_rate_limit_burst
= false;
5369 int unit_prepare_exec(Unit
*u
) {
5374 /* Prepares everything so that we can fork of a process for this unit */
5376 (void) unit_realize_cgroup(u
);
5378 if (u
->reset_accounting
) {
5379 (void) unit_reset_cpu_accounting(u
);
5380 (void) unit_reset_ip_accounting(u
);
5381 u
->reset_accounting
= false;
5384 unit_export_state_files(u
);
5386 r
= unit_setup_exec_runtime(u
);
5390 r
= unit_setup_dynamic_creds(u
);
5397 static void log_leftover(pid_t pid
, int sig
, void *userdata
) {
5398 _cleanup_free_
char *comm
= NULL
;
5400 (void) get_process_comm(pid
, &comm
);
5402 if (comm
&& comm
[0] == '(') /* Most likely our own helper process (PAM?), ignore */
5405 log_unit_warning(userdata
,
5406 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5407 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5411 void unit_warn_leftover_processes(Unit
*u
) {
5414 (void) unit_pick_cgroup_path(u
);
5416 if (!u
->cgroup_path
)
5419 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_leftover
, u
);
5422 bool unit_needs_console(Unit
*u
) {
5424 UnitActiveState state
;
5428 state
= unit_active_state(u
);
5430 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5433 if (UNIT_VTABLE(u
)->needs_console
)
5434 return UNIT_VTABLE(u
)->needs_console(u
);
5436 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5437 ec
= unit_get_exec_context(u
);
5441 return exec_context_may_touch_console(ec
);
5444 const char *unit_label_path(Unit
*u
) {
5447 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
5448 * when validating access checks. */
5450 p
= u
->source_path
?: u
->fragment_path
;
5454 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
5455 if (path_equal(p
, "/dev/null"))
5461 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5466 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5467 * and not a kernel thread either */
5469 /* First, a simple range check */
5470 if (!pid_is_valid(pid
))
5471 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5473 /* Some extra safety check */
5474 if (pid
== 1 || pid
== getpid_cached())
5475 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5477 /* Don't even begin to bother with kernel threads */
5478 r
= is_kernel_thread(pid
);
5480 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5482 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5484 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5489 void unit_log_success(Unit
*u
) {
5492 log_struct(LOG_INFO
,
5493 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5495 LOG_UNIT_INVOCATION_ID(u
),
5496 LOG_UNIT_MESSAGE(u
, "Succeeded."));
5499 void unit_log_failure(Unit
*u
, const char *result
) {
5503 log_struct(LOG_WARNING
,
5504 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5506 LOG_UNIT_INVOCATION_ID(u
),
5507 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5508 "UNIT_RESULT=%s", result
);
5511 void unit_log_process_exit(
5515 const char *command
,
5522 if (code
!= CLD_EXITED
)
5523 level
= LOG_WARNING
;
5526 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5527 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s",
5529 sigchld_code_to_string(code
), status
,
5530 strna(code
== CLD_EXITED
5531 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5532 : signal_to_string(status
))),
5533 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5534 "EXIT_STATUS=%i", status
,
5535 "COMMAND=%s", strna(command
),
5537 LOG_UNIT_INVOCATION_ID(u
));
5540 int unit_exit_status(Unit
*u
) {
5543 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5544 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5545 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5546 * service process has exited abnormally (signal/coredump). */
5548 if (!UNIT_VTABLE(u
)->exit_status
)
5551 return UNIT_VTABLE(u
)->exit_status(u
);
5554 int unit_failure_action_exit_status(Unit
*u
) {
5559 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5561 if (u
->failure_action_exit_status
>= 0)
5562 return u
->failure_action_exit_status
;
5564 r
= unit_exit_status(u
);
5565 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5571 int unit_success_action_exit_status(Unit
*u
) {
5576 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5578 if (u
->success_action_exit_status
>= 0)
5579 return u
->success_action_exit_status
;
5581 r
= unit_exit_status(u
);
5582 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5588 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5589 [COLLECT_INACTIVE
] = "inactive",
5590 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5593 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);