1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
9 #include "sd-messages.h"
11 #include "all-units.h"
12 #include "alloc-util.h"
13 #include "bpf-firewall.h"
14 #include "bpf-foreign.h"
15 #include "bpf-socket-bind.h"
16 #include "bus-common-errors.h"
18 #include "cgroup-setup.h"
19 #include "cgroup-util.h"
20 #include "core-varlink.h"
21 #include "dbus-unit.h"
27 #include "fileio-label.h"
29 #include "format-util.h"
30 #include "id128-util.h"
34 #include "load-dropin.h"
35 #include "load-fragment.h"
38 #include "missing_audit.h"
40 #include "path-util.h"
41 #include "process-util.h"
44 #include "signal-util.h"
45 #include "sparse-endian.h"
47 #include "specifier.h"
48 #include "stat-util.h"
49 #include "stdio-util.h"
50 #include "string-table.h"
51 #include "string-util.h"
53 #include "terminal-util.h"
54 #include "tmpfile-util.h"
55 #include "umask-util.h"
56 #include "unit-name.h"
58 #include "user-util.h"
64 /* Thresholds for logging at INFO level about resource consumption */
65 #define MENTIONWORTHY_CPU_NSEC (1 * NSEC_PER_SEC)
66 #define MENTIONWORTHY_IO_BYTES (1024 * 1024ULL)
67 #define MENTIONWORTHY_IP_BYTES (0ULL)
69 /* Thresholds for logging at INFO level about resource consumption */
70 #define NOTICEWORTHY_CPU_NSEC (10*60 * NSEC_PER_SEC) /* 10 minutes */
71 #define NOTICEWORTHY_IO_BYTES (10 * 1024 * 1024ULL) /* 10 MB */
72 #define NOTICEWORTHY_IP_BYTES (128 * 1024 * 1024ULL) /* 128 MB */
74 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
75 [UNIT_SERVICE
] = &service_vtable
,
76 [UNIT_SOCKET
] = &socket_vtable
,
77 [UNIT_TARGET
] = &target_vtable
,
78 [UNIT_DEVICE
] = &device_vtable
,
79 [UNIT_MOUNT
] = &mount_vtable
,
80 [UNIT_AUTOMOUNT
] = &automount_vtable
,
81 [UNIT_SWAP
] = &swap_vtable
,
82 [UNIT_TIMER
] = &timer_vtable
,
83 [UNIT_PATH
] = &path_vtable
,
84 [UNIT_SLICE
] = &slice_vtable
,
85 [UNIT_SCOPE
] = &scope_vtable
,
88 Unit
* unit_new(Manager
*m
, size_t size
) {
92 assert(size
>= sizeof(Unit
));
99 u
->type
= _UNIT_TYPE_INVALID
;
100 u
->default_dependencies
= true;
101 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
102 u
->unit_file_preset
= -1;
103 u
->on_failure_job_mode
= JOB_REPLACE
;
104 u
->on_success_job_mode
= JOB_FAIL
;
105 u
->cgroup_control_inotify_wd
= -1;
106 u
->cgroup_memory_inotify_wd
= -1;
107 u
->job_timeout
= USEC_INFINITY
;
108 u
->job_running_timeout
= USEC_INFINITY
;
109 u
->ref_uid
= UID_INVALID
;
110 u
->ref_gid
= GID_INVALID
;
111 u
->cpu_usage_last
= NSEC_INFINITY
;
112 u
->cgroup_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
113 u
->failure_action_exit_status
= u
->success_action_exit_status
= -1;
115 u
->ip_accounting_ingress_map_fd
= -1;
116 u
->ip_accounting_egress_map_fd
= -1;
117 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++)
118 u
->io_accounting_last
[i
] = UINT64_MAX
;
120 u
->ipv4_allow_map_fd
= -1;
121 u
->ipv6_allow_map_fd
= -1;
122 u
->ipv4_deny_map_fd
= -1;
123 u
->ipv6_deny_map_fd
= -1;
125 u
->last_section_private
= -1;
127 u
->start_ratelimit
= (RateLimit
) { m
->default_start_limit_interval
, m
->default_start_limit_burst
};
128 u
->auto_start_stop_ratelimit
= (RateLimit
) { 10 * USEC_PER_SEC
, 16 };
133 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
134 _cleanup_(unit_freep
) Unit
*u
= NULL
;
137 u
= unit_new(m
, size
);
141 r
= unit_add_name(u
, name
);
150 bool unit_has_name(const Unit
*u
, const char *name
) {
154 return streq_ptr(name
, u
->id
) ||
155 set_contains(u
->aliases
, name
);
158 static void unit_init(Unit
*u
) {
165 assert(u
->type
>= 0);
167 cc
= unit_get_cgroup_context(u
);
169 cgroup_context_init(cc
);
171 /* Copy in the manager defaults into the cgroup
172 * context, _before_ the rest of the settings have
173 * been initialized */
175 cc
->cpu_accounting
= u
->manager
->default_cpu_accounting
;
176 cc
->io_accounting
= u
->manager
->default_io_accounting
;
177 cc
->blockio_accounting
= u
->manager
->default_blockio_accounting
;
178 cc
->memory_accounting
= u
->manager
->default_memory_accounting
;
179 cc
->tasks_accounting
= u
->manager
->default_tasks_accounting
;
180 cc
->ip_accounting
= u
->manager
->default_ip_accounting
;
182 if (u
->type
!= UNIT_SLICE
)
183 cc
->tasks_max
= u
->manager
->default_tasks_max
;
186 ec
= unit_get_exec_context(u
);
188 exec_context_init(ec
);
190 if (MANAGER_IS_SYSTEM(u
->manager
))
191 ec
->keyring_mode
= EXEC_KEYRING_SHARED
;
193 ec
->keyring_mode
= EXEC_KEYRING_INHERIT
;
195 /* User manager might have its umask redefined by PAM or UMask=. In this
196 * case let the units it manages inherit this value by default. They can
197 * still tune this value through their own unit file */
198 (void) get_process_umask(getpid_cached(), &ec
->umask
);
202 kc
= unit_get_kill_context(u
);
204 kill_context_init(kc
);
206 if (UNIT_VTABLE(u
)->init
)
207 UNIT_VTABLE(u
)->init(u
);
210 static int unit_add_alias(Unit
*u
, char *donated_name
) {
213 /* Make sure that u->names is allocated. We may leave u->names
214 * empty if we fail later, but this is not a problem. */
215 r
= set_ensure_put(&u
->aliases
, &string_hash_ops
, donated_name
);
223 int unit_add_name(Unit
*u
, const char *text
) {
224 _cleanup_free_
char *name
= NULL
, *instance
= NULL
;
231 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
233 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
234 "instance is not set when adding name '%s': %m", text
);
236 r
= unit_name_replace_instance(text
, u
->instance
, &name
);
238 return log_unit_debug_errno(u
, r
,
239 "failed to build instance name from '%s': %m", text
);
246 if (unit_has_name(u
, name
))
249 if (hashmap_contains(u
->manager
->units
, name
))
250 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
251 "unit already exist when adding name '%s': %m", name
);
253 if (!unit_name_is_valid(name
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
254 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
255 "name '%s' is invalid: %m", name
);
257 t
= unit_name_to_type(name
);
259 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
260 "failed to derive unit type from name '%s': %m", name
);
262 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
263 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
264 "unit type is illegal: u->type(%d) and t(%d) for name '%s': %m",
267 r
= unit_name_to_instance(name
, &instance
);
269 return log_unit_debug_errno(u
, r
, "failed to extract instance from name '%s': %m", name
);
271 if (instance
&& !unit_type_may_template(t
))
272 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
), "templates are not allowed for name '%s': %m", name
);
274 /* Ensure that this unit either has no instance, or that the instance matches. */
275 if (u
->type
!= _UNIT_TYPE_INVALID
&& !streq_ptr(u
->instance
, instance
))
276 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
277 "cannot add name %s, the instances don't match (\"%s\" != \"%s\").",
278 name
, instance
, u
->instance
);
280 if (u
->id
&& !unit_type_may_alias(t
))
281 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
282 "cannot add name %s, aliases are not allowed for %s units.",
283 name
, unit_type_to_string(t
));
285 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
286 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(E2BIG
), "cannot add name, manager has too many units: %m");
288 /* Add name to the global hashmap first, because that's easier to undo */
289 r
= hashmap_put(u
->manager
->units
, name
, u
);
291 return log_unit_debug_errno(u
, r
, "add unit to hashmap failed for name '%s': %m", text
);
294 r
= unit_add_alias(u
, name
); /* unit_add_alias() takes ownership of the name on success */
296 hashmap_remove(u
->manager
->units
, name
);
302 /* A new name, we don't need the set yet. */
303 assert(u
->type
== _UNIT_TYPE_INVALID
);
304 assert(!u
->instance
);
307 u
->id
= TAKE_PTR(name
);
308 u
->instance
= TAKE_PTR(instance
);
310 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
314 unit_add_to_dbus_queue(u
);
318 int unit_choose_id(Unit
*u
, const char *name
) {
319 _cleanup_free_
char *t
= NULL
;
326 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
330 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
337 if (streq_ptr(u
->id
, name
))
338 return 0; /* Nothing to do. */
340 /* Selects one of the aliases of this unit as the id */
341 s
= set_get(u
->aliases
, (char*) name
);
346 r
= set_remove_and_put(u
->aliases
, name
, u
->id
);
350 assert_se(set_remove(u
->aliases
, name
)); /* see set_get() above… */
352 u
->id
= s
; /* Old u->id is now stored in the set, and s is not stored anywhere */
353 unit_add_to_dbus_queue(u
);
358 int unit_set_description(Unit
*u
, const char *description
) {
363 r
= free_and_strdup(&u
->description
, empty_to_null(description
));
367 unit_add_to_dbus_queue(u
);
372 bool unit_may_gc(Unit
*u
) {
373 UnitActiveState state
;
378 /* Checks whether the unit is ready to be unloaded for garbage collection.
379 * Returns true when the unit may be collected, and false if there's some
380 * reason to keep it loaded.
382 * References from other units are *not* checked here. Instead, this is done
383 * in unit_gc_sweep(), but using markers to properly collect dependency loops.
392 state
= unit_active_state(u
);
394 /* If the unit is inactive and failed and no job is queued for it, then release its runtime resources */
395 if (UNIT_IS_INACTIVE_OR_FAILED(state
) &&
396 UNIT_VTABLE(u
)->release_resources
)
397 UNIT_VTABLE(u
)->release_resources(u
);
402 if (sd_bus_track_count(u
->bus_track
) > 0)
405 /* But we keep the unit object around for longer when it is referenced or configured to not be gc'ed */
406 switch (u
->collect_mode
) {
408 case COLLECT_INACTIVE
:
409 if (state
!= UNIT_INACTIVE
)
414 case COLLECT_INACTIVE_OR_FAILED
:
415 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
421 assert_not_reached("Unknown garbage collection mode");
424 if (u
->cgroup_path
) {
425 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
426 * around. Units with active processes should never be collected. */
428 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
430 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", u
->cgroup_path
);
435 if (UNIT_VTABLE(u
)->may_gc
&& !UNIT_VTABLE(u
)->may_gc(u
))
441 void unit_add_to_load_queue(Unit
*u
) {
443 assert(u
->type
!= _UNIT_TYPE_INVALID
);
445 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
448 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
449 u
->in_load_queue
= true;
452 void unit_add_to_cleanup_queue(Unit
*u
) {
455 if (u
->in_cleanup_queue
)
458 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
459 u
->in_cleanup_queue
= true;
462 void unit_add_to_gc_queue(Unit
*u
) {
465 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
471 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
472 u
->in_gc_queue
= true;
475 void unit_add_to_dbus_queue(Unit
*u
) {
477 assert(u
->type
!= _UNIT_TYPE_INVALID
);
479 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
482 /* Shortcut things if nobody cares */
483 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
484 sd_bus_track_count(u
->bus_track
) <= 0 &&
485 set_isempty(u
->manager
->private_buses
)) {
486 u
->sent_dbus_new_signal
= true;
490 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
491 u
->in_dbus_queue
= true;
494 void unit_submit_to_stop_when_unneeded_queue(Unit
*u
) {
497 if (u
->in_stop_when_unneeded_queue
)
500 if (!u
->stop_when_unneeded
)
503 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
506 LIST_PREPEND(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
507 u
->in_stop_when_unneeded_queue
= true;
510 void unit_submit_to_start_when_upheld_queue(Unit
*u
) {
513 if (u
->in_start_when_upheld_queue
)
516 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)))
519 if (!unit_has_dependency(u
, UNIT_ATOM_START_STEADILY
, NULL
))
522 LIST_PREPEND(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
523 u
->in_start_when_upheld_queue
= true;
526 void unit_submit_to_stop_when_bound_queue(Unit
*u
) {
529 if (u
->in_stop_when_bound_queue
)
532 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
535 if (!unit_has_dependency(u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
, NULL
))
538 LIST_PREPEND(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
539 u
->in_stop_when_bound_queue
= true;
542 static void unit_clear_dependencies(Unit
*u
) {
545 /* Removes all dependencies configured on u and their reverse dependencies. */
547 for (Hashmap
*deps
; (deps
= hashmap_steal_first(u
->dependencies
));) {
549 for (Unit
*other
; (other
= hashmap_steal_first_key(deps
));) {
552 HASHMAP_FOREACH(other_deps
, other
->dependencies
)
553 hashmap_remove(other_deps
, u
);
555 unit_add_to_gc_queue(other
);
561 u
->dependencies
= hashmap_free(u
->dependencies
);
564 static void unit_remove_transient(Unit
*u
) {
572 if (u
->fragment_path
)
573 (void) unlink(u
->fragment_path
);
575 STRV_FOREACH(i
, u
->dropin_paths
) {
576 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
578 p
= dirname_malloc(*i
); /* Get the drop-in directory from the drop-in file */
582 pp
= dirname_malloc(p
); /* Get the config directory from the drop-in directory */
586 /* Only drop transient drop-ins */
587 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
595 static void unit_free_requires_mounts_for(Unit
*u
) {
599 _cleanup_free_
char *path
= NULL
;
601 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
605 char s
[strlen(path
) + 1];
607 PATH_FOREACH_PREFIX_MORE(s
, path
) {
611 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
615 (void) set_remove(x
, u
);
617 if (set_isempty(x
)) {
618 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
626 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
629 static void unit_done(Unit
*u
) {
638 if (UNIT_VTABLE(u
)->done
)
639 UNIT_VTABLE(u
)->done(u
);
641 ec
= unit_get_exec_context(u
);
643 exec_context_done(ec
);
645 cc
= unit_get_cgroup_context(u
);
647 cgroup_context_done(cc
);
650 Unit
* unit_free(Unit
*u
) {
657 u
->transient_file
= safe_fclose(u
->transient_file
);
659 if (!MANAGER_IS_RELOADING(u
->manager
))
660 unit_remove_transient(u
);
662 bus_unit_send_removed_signal(u
);
666 unit_dequeue_rewatch_pids(u
);
668 sd_bus_slot_unref(u
->match_bus_slot
);
669 sd_bus_track_unref(u
->bus_track
);
670 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
671 u
->pending_freezer_message
= sd_bus_message_unref(u
->pending_freezer_message
);
673 unit_free_requires_mounts_for(u
);
675 SET_FOREACH(t
, u
->aliases
)
676 hashmap_remove_value(u
->manager
->units
, t
, u
);
678 hashmap_remove_value(u
->manager
->units
, u
->id
, u
);
680 if (!sd_id128_is_null(u
->invocation_id
))
681 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
695 /* A unit is being dropped from the tree, make sure our family is realized properly. Do this after we
696 * detach the unit from slice tree in order to eliminate its effect on controller masks. */
697 slice
= UNIT_GET_SLICE(u
);
698 unit_clear_dependencies(u
);
700 unit_add_family_to_cgroup_realize_queue(slice
);
703 manager_unref_console(u
->manager
);
706 fdset_free(u
->initial_socket_bind_link_fds
);
708 bpf_link_free(u
->ipv4_socket_bind_link
);
709 bpf_link_free(u
->ipv6_socket_bind_link
);
712 unit_release_cgroup(u
);
714 if (!MANAGER_IS_RELOADING(u
->manager
))
715 unit_unlink_state_files(u
);
717 unit_unref_uid_gid(u
, false);
719 (void) manager_update_failed_units(u
->manager
, u
, false);
720 set_remove(u
->manager
->startup_units
, u
);
722 unit_unwatch_all_pids(u
);
724 while (u
->refs_by_target
)
725 unit_ref_unset(u
->refs_by_target
);
727 if (u
->type
!= _UNIT_TYPE_INVALID
)
728 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
730 if (u
->in_load_queue
)
731 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
733 if (u
->in_dbus_queue
)
734 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
737 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
739 if (u
->in_cgroup_realize_queue
)
740 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
742 if (u
->in_cgroup_empty_queue
)
743 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
745 if (u
->in_cleanup_queue
)
746 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
748 if (u
->in_target_deps_queue
)
749 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
751 if (u
->in_stop_when_unneeded_queue
)
752 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
754 if (u
->in_start_when_upheld_queue
)
755 LIST_REMOVE(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
757 if (u
->in_stop_when_bound_queue
)
758 LIST_REMOVE(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
760 bpf_firewall_close(u
);
762 hashmap_free(u
->bpf_foreign_by_key
);
764 bpf_program_unref(u
->bpf_device_control_installed
);
766 condition_free_list(u
->conditions
);
767 condition_free_list(u
->asserts
);
769 free(u
->description
);
770 strv_free(u
->documentation
);
771 free(u
->fragment_path
);
772 free(u
->source_path
);
773 strv_free(u
->dropin_paths
);
776 free(u
->job_timeout_reboot_arg
);
779 set_free_free(u
->aliases
);
785 FreezerState
unit_freezer_state(Unit
*u
) {
788 return u
->freezer_state
;
791 int unit_freezer_state_kernel(Unit
*u
, FreezerState
*ret
) {
792 char *values
[1] = {};
797 r
= cg_get_keyed_attribute(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events",
798 STRV_MAKE("frozen"), values
);
802 r
= _FREEZER_STATE_INVALID
;
805 if (streq(values
[0], "0"))
807 else if (streq(values
[0], "1"))
817 UnitActiveState
unit_active_state(Unit
*u
) {
820 if (u
->load_state
== UNIT_MERGED
)
821 return unit_active_state(unit_follow_merge(u
));
823 /* After a reload it might happen that a unit is not correctly
824 * loaded but still has a process around. That's why we won't
825 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
827 return UNIT_VTABLE(u
)->active_state(u
);
830 const char* unit_sub_state_to_string(Unit
*u
) {
833 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
836 static int unit_merge_names(Unit
*u
, Unit
*other
) {
843 r
= unit_add_alias(u
, other
->id
);
847 r
= set_move(u
->aliases
, other
->aliases
);
849 set_remove(u
->aliases
, other
->id
);
854 other
->aliases
= set_free_free(other
->aliases
);
856 SET_FOREACH(name
, u
->aliases
)
857 assert_se(hashmap_replace(u
->manager
->units
, name
, u
) == 0);
862 static int unit_reserve_dependencies(Unit
*u
, Unit
*other
) {
871 /* Let's reserve some space in the dependency hashmaps so that later on merging the units cannot
874 * First make some room in the per dependency type hashmaps. Using the summed size of both unit's
875 * hashmaps is an estimate that is likely too high since they probably use some of the same
876 * types. But it's never too low, and that's all we need. */
878 n_reserve
= MIN(hashmap_size(other
->dependencies
), LESS_BY((size_t) _UNIT_DEPENDENCY_MAX
, hashmap_size(u
->dependencies
)));
880 r
= hashmap_ensure_allocated(&u
->dependencies
, NULL
);
884 r
= hashmap_reserve(u
->dependencies
, n_reserve
);
889 /* Now, enlarge our per dependency type hashmaps by the number of entries in the same hashmap of the
890 * other unit's dependencies.
892 * NB: If u does not have a dependency set allocated for some dependency type, there is no need to
893 * reserve anything for. In that case other's set will be transferred as a whole to u by
894 * complete_move(). */
896 HASHMAP_FOREACH_KEY(deps
, d
, u
->dependencies
) {
899 other_deps
= hashmap_get(other
->dependencies
, d
);
901 r
= hashmap_reserve(deps
, hashmap_size(other_deps
));
909 static void unit_maybe_warn_about_dependency(
911 const char *other_id
,
912 UnitDependency dependency
) {
916 /* Only warn about some unit types */
917 if (!IN_SET(dependency
,
928 if (streq_ptr(u
->id
, other_id
))
929 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
931 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other_id
), u
->id
);
934 static int unit_per_dependency_type_hashmap_update(
937 UnitDependencyMask origin_mask
,
938 UnitDependencyMask destination_mask
) {
940 UnitDependencyInfo info
;
944 assert_cc(sizeof(void*) == sizeof(info
));
946 /* Acquire the UnitDependencyInfo entry for the Unit* we are interested in, and update it if it
947 * exists, or insert it anew if not. */
949 info
.data
= hashmap_get(per_type
, other
);
951 /* Entry already exists. Add in our mask. */
953 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
954 FLAGS_SET(destination_mask
, info
.destination_mask
))
957 info
.origin_mask
|= origin_mask
;
958 info
.destination_mask
|= destination_mask
;
960 r
= hashmap_update(per_type
, other
, info
.data
);
962 info
= (UnitDependencyInfo
) {
963 .origin_mask
= origin_mask
,
964 .destination_mask
= destination_mask
,
967 r
= hashmap_put(per_type
, other
, info
.data
);
976 static int unit_add_dependency_hashmap(
977 Hashmap
**dependencies
,
980 UnitDependencyMask origin_mask
,
981 UnitDependencyMask destination_mask
) {
986 assert(dependencies
);
988 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
989 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
990 assert(origin_mask
> 0 || destination_mask
> 0);
992 /* Ensure the top-level dependency hashmap exists that maps UnitDependency → Hashmap(Unit* →
993 * UnitDependencyInfo) */
994 r
= hashmap_ensure_allocated(dependencies
, NULL
);
998 /* Acquire the inner hashmap, that maps Unit* → UnitDependencyInfo, for the specified dependency
999 * type, and if it's missing allocate it and insert it. */
1000 per_type
= hashmap_get(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
));
1002 per_type
= hashmap_new(NULL
);
1006 r
= hashmap_put(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
), per_type
);
1008 hashmap_free(per_type
);
1013 return unit_per_dependency_type_hashmap_update(per_type
, other
, origin_mask
, destination_mask
);
1016 static void unit_merge_dependencies(
1029 _cleanup_(hashmap_freep
) Hashmap
*other_deps
= NULL
;
1030 UnitDependencyInfo di_back
;
1032 void *dt
; /* Actually of type UnitDependency, except that we don't bother casting it here,
1033 * since the hashmaps all want it as void pointer. */
1035 /* Let's focus on one dependency type at a time, that 'other' has defined. */
1036 other_deps
= hashmap_steal_first_key_and_value(other
->dependencies
, &dt
);
1040 /* Now iterate through all dependencies of this dependency type, of 'other'. We refer to the
1041 * referenced units as 'back'. */
1042 HASHMAP_FOREACH_KEY(di_back
.data
, back
, other_deps
) {
1047 /* This is a dependency pointing back to the unit we want to merge with?
1048 * Suppress it (but warn) */
1049 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1053 /* Now iterate through all deps of 'back', and fix the ones pointing to 'other' to
1054 * point to 'u' instead. */
1055 HASHMAP_FOREACH_KEY(back_deps
, back_dt
, back
->dependencies
) {
1056 UnitDependencyInfo di_move
;
1058 di_move
.data
= hashmap_remove(back_deps
, other
);
1062 assert_se(unit_per_dependency_type_hashmap_update(
1065 di_move
.origin_mask
,
1066 di_move
.destination_mask
) >= 0);
1070 /* Now all references towards 'other' of the current type 'dt' are corrected to point to
1071 * 'u'. Lets's now move the deps of type 'dt' from 'other' to 'u'. First, let's try to move
1072 * them per type wholesale. */
1073 r
= hashmap_put(u
->dependencies
, dt
, other_deps
);
1077 /* The target unit already has dependencies of this type, let's then merge this individually. */
1079 assert_se(deps
= hashmap_get(u
->dependencies
, dt
));
1082 UnitDependencyInfo di_move
;
1085 di_move
.data
= hashmap_steal_first_key_and_value(other_deps
, (void**) &back
);
1089 /* Would point back to us, ignore */
1090 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1094 assert_se(unit_per_dependency_type_hashmap_update(deps
, back
, di_move
.origin_mask
, di_move
.destination_mask
) >= 0);
1098 TAKE_PTR(other_deps
);
1100 if (hashmap_remove(other_deps
, u
))
1101 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1105 other
->dependencies
= hashmap_free(other
->dependencies
);
1108 int unit_merge(Unit
*u
, Unit
*other
) {
1113 assert(u
->manager
== other
->manager
);
1114 assert(u
->type
!= _UNIT_TYPE_INVALID
);
1116 other
= unit_follow_merge(other
);
1121 if (u
->type
!= other
->type
)
1124 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
1127 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
1130 if (!streq_ptr(u
->instance
, other
->instance
))
1139 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1142 /* Make reservations to ensure merge_dependencies() won't fail. We don't rollback reservations if we
1143 * fail. We don't have a way to undo reservations. A reservation is not a leak. */
1144 r
= unit_reserve_dependencies(u
, other
);
1149 r
= unit_merge_names(u
, other
);
1153 /* Redirect all references */
1154 while (other
->refs_by_target
)
1155 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
1157 /* Merge dependencies */
1158 unit_merge_dependencies(u
, other
);
1160 other
->load_state
= UNIT_MERGED
;
1161 other
->merged_into
= u
;
1163 /* If there is still some data attached to the other node, we
1164 * don't need it anymore, and can free it. */
1165 if (other
->load_state
!= UNIT_STUB
)
1166 if (UNIT_VTABLE(other
)->done
)
1167 UNIT_VTABLE(other
)->done(other
);
1169 unit_add_to_dbus_queue(u
);
1170 unit_add_to_cleanup_queue(other
);
1175 int unit_merge_by_name(Unit
*u
, const char *name
) {
1176 _cleanup_free_
char *s
= NULL
;
1180 /* Either add name to u, or if a unit with name already exists, merge it with u.
1181 * If name is a template, do the same for name@instance, where instance is u's instance. */
1186 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
1190 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
1197 other
= manager_get_unit(u
->manager
, name
);
1199 return unit_merge(u
, other
);
1201 return unit_add_name(u
, name
);
1204 Unit
* unit_follow_merge(Unit
*u
) {
1207 while (u
->load_state
== UNIT_MERGED
)
1208 assert_se(u
= u
->merged_into
);
1213 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
1219 if (c
->working_directory
&& !c
->working_directory_missing_ok
) {
1220 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
1225 if (c
->root_directory
) {
1226 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
1231 if (c
->root_image
) {
1232 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
1237 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
1238 if (!u
->manager
->prefix
[dt
])
1242 STRV_FOREACH(dp
, c
->directories
[dt
].paths
) {
1243 _cleanup_free_
char *p
= NULL
;
1245 p
= path_join(u
->manager
->prefix
[dt
], *dp
);
1249 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1255 if (!MANAGER_IS_SYSTEM(u
->manager
))
1258 /* For the following three directory types we need write access, and /var/ is possibly on the root
1259 * fs. Hence order after systemd-remount-fs.service, to ensure things are writable. */
1260 if (!strv_isempty(c
->directories
[EXEC_DIRECTORY_STATE
].paths
) ||
1261 !strv_isempty(c
->directories
[EXEC_DIRECTORY_CACHE
].paths
) ||
1262 !strv_isempty(c
->directories
[EXEC_DIRECTORY_LOGS
].paths
)) {
1263 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_REMOUNT_FS_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1268 if (c
->private_tmp
) {
1270 /* FIXME: for now we make a special case for /tmp and add a weak dependency on
1271 * tmp.mount so /tmp being masked is supported. However there's no reason to treat
1272 * /tmp specifically and masking other mount units should be handled more
1273 * gracefully too, see PR#16894. */
1274 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "tmp.mount", true, UNIT_DEPENDENCY_FILE
);
1278 r
= unit_require_mounts_for(u
, "/var/tmp", UNIT_DEPENDENCY_FILE
);
1282 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1287 if (c
->root_image
) {
1288 /* We need to wait for /dev/loopX to appear when doing RootImage=, hence let's add an
1289 * implicit dependency on udev */
1291 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_UDEVD_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1296 if (!IN_SET(c
->std_output
,
1297 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1298 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1299 !IN_SET(c
->std_error
,
1300 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1301 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1305 /* If syslog or kernel logging is requested (or log namespacing is), make sure our own logging daemon
1308 if (c
->log_namespace
) {
1309 _cleanup_free_
char *socket_unit
= NULL
, *varlink_socket_unit
= NULL
;
1311 r
= unit_name_build_from_type("systemd-journald", c
->log_namespace
, UNIT_SOCKET
, &socket_unit
);
1315 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1319 r
= unit_name_build_from_type("systemd-journald-varlink", c
->log_namespace
, UNIT_SOCKET
, &varlink_socket_unit
);
1323 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, varlink_socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1327 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1334 const char* unit_description(Unit
*u
) {
1338 return u
->description
;
1340 return strna(u
->id
);
1343 const char* unit_status_string(Unit
*u
, char **combined
) {
1347 /* Return u->id, u->description, or "{u->id} - {u->description}".
1348 * Versions with u->description are only used if it is set.
1349 * The last option is used if configured and the caller provided 'combined' pointer. */
1351 if (!u
->description
||
1352 u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
||
1353 (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& !combined
))
1356 if (u
->description
&& u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& combined
) {
1357 char *t
= strjoin(u
->id
, " - ", u
->description
);
1365 return u
->description
;
1368 /* Common implementation for multiple backends */
1369 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1374 /* Load a .{service,socket,...} file */
1375 r
= unit_load_fragment(u
);
1379 if (u
->load_state
== UNIT_STUB
) {
1380 if (fragment_required
)
1383 u
->load_state
= UNIT_LOADED
;
1386 /* Load drop-in directory data. If u is an alias, we might be reloading the
1387 * target unit needlessly. But we cannot be sure which drops-ins have already
1388 * been loaded and which not, at least without doing complicated book-keeping,
1389 * so let's always reread all drop-ins. */
1390 r
= unit_load_dropin(unit_follow_merge(u
));
1394 if (u
->source_path
) {
1397 if (stat(u
->source_path
, &st
) >= 0)
1398 u
->source_mtime
= timespec_load(&st
.st_mtim
);
1400 u
->source_mtime
= 0;
1406 void unit_add_to_target_deps_queue(Unit
*u
) {
1407 Manager
*m
= u
->manager
;
1411 if (u
->in_target_deps_queue
)
1414 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1415 u
->in_target_deps_queue
= true;
1418 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1422 if (target
->type
!= UNIT_TARGET
)
1425 /* Only add the dependency if both units are loaded, so that
1426 * that loop check below is reliable */
1427 if (u
->load_state
!= UNIT_LOADED
||
1428 target
->load_state
!= UNIT_LOADED
)
1431 /* If either side wants no automatic dependencies, then let's
1433 if (!u
->default_dependencies
||
1434 !target
->default_dependencies
)
1437 /* Don't create loops */
1438 if (unit_has_dependency(target
, UNIT_ATOM_BEFORE
, u
))
1441 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1444 static int unit_add_slice_dependencies(Unit
*u
) {
1448 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1451 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1452 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1454 UnitDependencyMask mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1456 slice
= UNIT_GET_SLICE(u
);
1458 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, slice
, true, mask
);
1460 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1463 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1466 static int unit_add_mount_dependencies(Unit
*u
) {
1467 UnitDependencyInfo di
;
1473 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
) {
1474 char prefix
[strlen(path
) + 1];
1476 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1477 _cleanup_free_
char *p
= NULL
;
1480 r
= unit_name_from_path(prefix
, ".mount", &p
);
1481 if (IN_SET(r
, -EINVAL
, -ENAMETOOLONG
))
1482 continue; /* If the path cannot be converted to a mount unit name, then it's
1483 * not manageable as a unit by systemd, and hence we don't need a
1484 * dependency on it. Let's thus silently ignore the issue. */
1488 m
= manager_get_unit(u
->manager
, p
);
1490 /* Make sure to load the mount unit if it exists. If so the dependencies on
1491 * this unit will be added later during the loading of the mount unit. */
1492 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1498 if (m
->load_state
!= UNIT_LOADED
)
1501 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1505 if (m
->fragment_path
) {
1506 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1516 static int unit_add_oomd_dependencies(Unit
*u
) {
1523 if (!u
->default_dependencies
)
1526 c
= unit_get_cgroup_context(u
);
1530 wants_oomd
= (c
->moom_swap
== MANAGED_OOM_KILL
|| c
->moom_mem_pressure
== MANAGED_OOM_KILL
);
1534 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "systemd-oomd.service", true, UNIT_DEPENDENCY_FILE
);
1541 static int unit_add_startup_units(Unit
*u
) {
1544 c
= unit_get_cgroup_context(u
);
1548 if (c
->startup_cpu_shares
== CGROUP_CPU_SHARES_INVALID
&&
1549 c
->startup_io_weight
== CGROUP_WEIGHT_INVALID
&&
1550 c
->startup_blockio_weight
== CGROUP_BLKIO_WEIGHT_INVALID
)
1553 return set_ensure_put(&u
->manager
->startup_units
, NULL
, u
);
1556 static int unit_validate_on_failure_job_mode(
1558 const char *job_mode_setting
,
1560 const char *dependency_name
,
1561 UnitDependencyAtom atom
) {
1563 Unit
*other
, *found
= NULL
;
1565 if (job_mode
!= JOB_ISOLATE
)
1568 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
1571 else if (found
!= other
)
1572 return log_unit_error_errno(
1573 u
, SYNTHETIC_ERRNO(ENOEXEC
),
1574 "More than one %s dependencies specified but %sisolate set. Refusing.",
1575 dependency_name
, job_mode_setting
);
1581 int unit_load(Unit
*u
) {
1586 if (u
->in_load_queue
) {
1587 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1588 u
->in_load_queue
= false;
1591 if (u
->type
== _UNIT_TYPE_INVALID
)
1594 if (u
->load_state
!= UNIT_STUB
)
1597 if (u
->transient_file
) {
1598 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1599 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1601 r
= fflush_and_check(u
->transient_file
);
1605 u
->transient_file
= safe_fclose(u
->transient_file
);
1606 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1609 r
= UNIT_VTABLE(u
)->load(u
);
1613 assert(u
->load_state
!= UNIT_STUB
);
1615 if (u
->load_state
== UNIT_LOADED
) {
1616 unit_add_to_target_deps_queue(u
);
1618 r
= unit_add_slice_dependencies(u
);
1622 r
= unit_add_mount_dependencies(u
);
1626 r
= unit_add_oomd_dependencies(u
);
1630 r
= unit_add_startup_units(u
);
1634 r
= unit_validate_on_failure_job_mode(u
, "OnSuccessJobMode=", u
->on_success_job_mode
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
);
1638 r
= unit_validate_on_failure_job_mode(u
, "OnFailureJobMode=", u
->on_failure_job_mode
, "OnFailure=", UNIT_ATOM_ON_FAILURE
);
1642 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1643 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1645 /* We finished loading, let's ensure our parents recalculate the members mask */
1646 unit_invalidate_cgroup_members_masks(u
);
1649 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1651 unit_add_to_dbus_queue(unit_follow_merge(u
));
1652 unit_add_to_gc_queue(u
);
1653 (void) manager_varlink_send_managed_oom_update(u
);
1658 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code
1659 * should hence return ENOEXEC to ensure units are placed in this state after loading. */
1661 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1662 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1666 /* Record the timestamp on the cache, so that if the cache gets updated between now and the next time
1667 * an attempt is made to load this unit, we know we need to check again. */
1668 if (u
->load_state
== UNIT_NOT_FOUND
)
1669 u
->fragment_not_found_timestamp_hash
= u
->manager
->unit_cache_timestamp_hash
;
1671 unit_add_to_dbus_queue(u
);
1672 unit_add_to_gc_queue(u
);
1674 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1678 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1683 if (u
&& !unit_log_level_test(u
, level
))
1684 return -ERRNO_VALUE(error
);
1686 va_start(ap
, format
);
1688 r
= log_object_internalv(level
, error
, file
, line
, func
,
1689 u
->manager
->unit_log_field
,
1691 u
->manager
->invocation_log_field
,
1692 u
->invocation_id_string
,
1695 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1701 static bool unit_test_condition(Unit
*u
) {
1702 _cleanup_strv_free_
char **env
= NULL
;
1707 dual_timestamp_get(&u
->condition_timestamp
);
1709 r
= manager_get_effective_environment(u
->manager
, &env
);
1711 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1712 u
->condition_result
= CONDITION_ERROR
;
1714 u
->condition_result
= condition_test_list(
1717 condition_type_to_string
,
1721 unit_add_to_dbus_queue(u
);
1722 return u
->condition_result
;
1725 static bool unit_test_assert(Unit
*u
) {
1726 _cleanup_strv_free_
char **env
= NULL
;
1731 dual_timestamp_get(&u
->assert_timestamp
);
1733 r
= manager_get_effective_environment(u
->manager
, &env
);
1735 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1736 u
->assert_result
= CONDITION_ERROR
;
1738 u
->assert_result
= condition_test_list(
1741 assert_type_to_string
,
1745 unit_add_to_dbus_queue(u
);
1746 return u
->assert_result
;
1749 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *format
, const char *ident
) {
1750 if (log_get_show_color()) {
1751 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& strchr(ident
, ' '))
1752 ident
= strjoina(ANSI_HIGHLIGHT
, u
->id
, ANSI_NORMAL
, " - ", u
->description
);
1754 ident
= strjoina(ANSI_HIGHLIGHT
, ident
, ANSI_NORMAL
);
1757 DISABLE_WARNING_FORMAT_NONLITERAL
;
1758 manager_status_printf(u
->manager
, status_type
, status
, format
, ident
);
1762 int unit_test_start_limit(Unit
*u
) {
1767 if (ratelimit_below(&u
->start_ratelimit
)) {
1768 u
->start_limit_hit
= false;
1772 log_unit_warning(u
, "Start request repeated too quickly.");
1773 u
->start_limit_hit
= true;
1775 reason
= strjoina("unit ", u
->id
, " failed");
1777 emergency_action(u
->manager
, u
->start_limit_action
,
1778 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1779 u
->reboot_arg
, -1, reason
);
1784 bool unit_shall_confirm_spawn(Unit
*u
) {
1787 if (manager_is_confirm_spawn_disabled(u
->manager
))
1790 /* For some reasons units remaining in the same process group
1791 * as PID 1 fail to acquire the console even if it's not used
1792 * by any process. So skip the confirmation question for them. */
1793 return !unit_get_exec_context(u
)->same_pgrp
;
1796 static bool unit_verify_deps(Unit
*u
) {
1801 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined
1802 * with After=. We do not check Requires= or Requisite= here as they only should have an effect on
1803 * the job processing, but do not have any effect afterwards. We don't check BindsTo= dependencies
1804 * that are not used in conjunction with After= as for them any such check would make things entirely
1807 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
1809 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
))
1812 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1813 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1821 /* Errors that aren't really errors:
1822 * -EALREADY: Unit is already started.
1823 * -ECOMM: Condition failed
1824 * -EAGAIN: An operation is already in progress. Retry later.
1826 * Errors that are real errors:
1827 * -EBADR: This unit type does not support starting.
1828 * -ECANCELED: Start limit hit, too many requests for now
1829 * -EPROTO: Assert failed
1830 * -EINVAL: Unit not loaded
1831 * -EOPNOTSUPP: Unit type not supported
1832 * -ENOLINK: The necessary dependencies are not fulfilled.
1833 * -ESTALE: This unit has been started before and can't be started a second time
1834 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1836 int unit_start(Unit
*u
) {
1837 UnitActiveState state
;
1842 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1843 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1844 * waiting is finished. */
1845 state
= unit_active_state(u
);
1846 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1848 if (state
== UNIT_MAINTENANCE
)
1851 /* Units that aren't loaded cannot be started */
1852 if (u
->load_state
!= UNIT_LOADED
)
1855 /* Refuse starting scope units more than once */
1856 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1859 /* If the conditions failed, don't do anything at all. If we already are activating this call might
1860 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1861 * recheck the condition in that case. */
1862 if (state
!= UNIT_ACTIVATING
&&
1863 !unit_test_condition(u
))
1864 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition failed. Not starting unit.");
1866 /* If the asserts failed, fail the entire job */
1867 if (state
!= UNIT_ACTIVATING
&&
1868 !unit_test_assert(u
))
1869 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1871 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1872 * condition checks, so that we rather return condition check errors (which are usually not
1873 * considered a true failure) than "not supported" errors (which are considered a failure).
1875 if (!unit_type_supported(u
->type
))
1878 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1879 * should have taken care of this already, but let's check this here again. After all, our
1880 * dependencies might not be in effect anymore, due to a reload or due to a failed condition. */
1881 if (!unit_verify_deps(u
))
1884 /* Forward to the main object, if we aren't it. */
1885 following
= unit_following(u
);
1887 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1888 return unit_start(following
);
1891 /* If it is stopped, but we cannot start it, then fail */
1892 if (!UNIT_VTABLE(u
)->start
)
1895 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1896 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1897 * waits for a holdoff timer to elapse before it will start again. */
1899 unit_add_to_dbus_queue(u
);
1900 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1902 return UNIT_VTABLE(u
)->start(u
);
1905 bool unit_can_start(Unit
*u
) {
1908 if (u
->load_state
!= UNIT_LOADED
)
1911 if (!unit_type_supported(u
->type
))
1914 /* Scope units may be started only once */
1915 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
1918 return !!UNIT_VTABLE(u
)->start
;
1921 bool unit_can_isolate(Unit
*u
) {
1924 return unit_can_start(u
) &&
1929 * -EBADR: This unit type does not support stopping.
1930 * -EALREADY: Unit is already stopped.
1931 * -EAGAIN: An operation is already in progress. Retry later.
1933 int unit_stop(Unit
*u
) {
1934 UnitActiveState state
;
1939 state
= unit_active_state(u
);
1940 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1943 following
= unit_following(u
);
1945 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1946 return unit_stop(following
);
1949 if (!UNIT_VTABLE(u
)->stop
)
1952 unit_add_to_dbus_queue(u
);
1953 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1955 return UNIT_VTABLE(u
)->stop(u
);
1958 bool unit_can_stop(Unit
*u
) {
1961 /* Note: if we return true here, it does not mean that the unit may be successfully stopped.
1962 * Extrinsic units follow external state and they may stop following external state changes
1963 * (hence we return true here), but an attempt to do this through the manager will fail. */
1965 if (!unit_type_supported(u
->type
))
1971 return !!UNIT_VTABLE(u
)->stop
;
1975 * -EBADR: This unit type does not support reloading.
1976 * -ENOEXEC: Unit is not started.
1977 * -EAGAIN: An operation is already in progress. Retry later.
1979 int unit_reload(Unit
*u
) {
1980 UnitActiveState state
;
1985 if (u
->load_state
!= UNIT_LOADED
)
1988 if (!unit_can_reload(u
))
1991 state
= unit_active_state(u
);
1992 if (state
== UNIT_RELOADING
)
1995 if (state
!= UNIT_ACTIVE
)
1996 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
), "Unit cannot be reloaded because it is inactive.");
1998 following
= unit_following(u
);
2000 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
2001 return unit_reload(following
);
2004 unit_add_to_dbus_queue(u
);
2006 if (!UNIT_VTABLE(u
)->reload
) {
2007 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
2008 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), 0);
2012 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2014 return UNIT_VTABLE(u
)->reload(u
);
2017 bool unit_can_reload(Unit
*u
) {
2020 if (UNIT_VTABLE(u
)->can_reload
)
2021 return UNIT_VTABLE(u
)->can_reload(u
);
2023 if (unit_has_dependency(u
, UNIT_ATOM_PROPAGATES_RELOAD_TO
, NULL
))
2026 return UNIT_VTABLE(u
)->reload
;
2029 bool unit_is_unneeded(Unit
*u
) {
2033 if (!u
->stop_when_unneeded
)
2036 /* Don't clean up while the unit is transitioning or is even inactive. */
2037 if (unit_active_state(u
) != UNIT_ACTIVE
)
2042 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_PINS_STOP_WHEN_UNNEEDED
) {
2043 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
2044 * restart, then don't clean this one up. */
2049 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2052 if (unit_will_restart(other
))
2059 bool unit_is_upheld_by_active(Unit
*u
, Unit
**ret_culprit
) {
2064 /* Checks if the unit needs to be started because it currently is not running, but some other unit
2065 * that is active declared an Uphold= dependencies on it */
2067 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)) || u
->job
) {
2069 *ret_culprit
= NULL
;
2073 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_START_STEADILY
) {
2077 if (UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
2079 *ret_culprit
= other
;
2085 *ret_culprit
= NULL
;
2089 bool unit_is_bound_by_inactive(Unit
*u
, Unit
**ret_culprit
) {
2094 /* Checks whether this unit is bound to another unit that is inactive, i.e. whether we should stop
2095 * because the other unit is down. */
2097 if (unit_active_state(u
) != UNIT_ACTIVE
|| u
->job
) {
2098 /* Don't clean up while the unit is transitioning or is even inactive. */
2100 *ret_culprit
= NULL
;
2104 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
2108 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
))) {
2110 *ret_culprit
= other
;
2117 *ret_culprit
= NULL
;
2121 static void check_unneeded_dependencies(Unit
*u
) {
2125 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2127 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_STOP_WHEN_UNNEEDED_QUEUE
)
2128 unit_submit_to_stop_when_unneeded_queue(other
);
2131 static void check_uphold_dependencies(Unit
*u
) {
2135 /* Add all units this unit depends on to the queue that processes Uphold= behaviour. */
2137 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_START_WHEN_UPHELD_QUEUE
)
2138 unit_submit_to_start_when_upheld_queue(other
);
2141 static void check_bound_by_dependencies(Unit
*u
) {
2145 /* Add all units this unit depends on to the queue that processes BindsTo= stop behaviour. */
2147 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_CANNOT_BE_ACTIVE_WITHOUT_QUEUE
)
2148 unit_submit_to_stop_when_bound_queue(other
);
2151 static void retroactively_start_dependencies(Unit
*u
) {
2155 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2157 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_REPLACE
) /* Requires= + BindsTo= */
2158 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2159 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2160 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2162 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_FAIL
) /* Wants= */
2163 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2164 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2165 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2167 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_START
) /* Conflicts= (and inverse) */
2168 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2169 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2172 static void retroactively_stop_dependencies(Unit
*u
) {
2176 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2178 /* Pull down units which are bound to us recursively if enabled */
2179 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_STOP
) /* BoundBy= */
2180 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2181 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2184 void unit_start_on_failure(
2186 const char *dependency_name
,
2187 UnitDependencyAtom atom
,
2190 bool logged
= false;
2195 assert(dependency_name
);
2196 assert(IN_SET(atom
, UNIT_ATOM_ON_SUCCESS
, UNIT_ATOM_ON_FAILURE
));
2198 /* Act on OnFailure= and OnSuccess= dependencies */
2200 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
2201 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2204 log_unit_info(u
, "Triggering %s dependencies.", dependency_name
);
2208 r
= manager_add_job(u
->manager
, JOB_START
, other
, job_mode
, NULL
, &error
, NULL
);
2210 log_unit_warning_errno(
2211 u
, r
, "Failed to enqueue %s job, ignoring: %s",
2212 dependency_name
, bus_error_message(&error
, r
));
2216 log_unit_debug(u
, "Triggering %s dependencies done.", dependency_name
);
2219 void unit_trigger_notify(Unit
*u
) {
2224 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_TRIGGERED_BY
)
2225 if (UNIT_VTABLE(other
)->trigger_notify
)
2226 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2229 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2230 if (condition_notice
&& log_level
> LOG_NOTICE
)
2232 if (condition_info
&& log_level
> LOG_INFO
)
2237 static int unit_log_resources(Unit
*u
) {
2238 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4];
2239 bool any_traffic
= false, have_ip_accounting
= false, any_io
= false, have_io_accounting
= false;
2240 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
, *rr
= NULL
, *wr
= NULL
;
2241 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a threshold */
2242 size_t n_message_parts
= 0, n_iovec
= 0;
2243 char* message_parts
[1 + 2 + 2 + 1], *t
;
2244 nsec_t nsec
= NSEC_INFINITY
;
2246 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2247 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2248 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2249 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2250 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2252 const char* const io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2253 [CGROUP_IO_READ_BYTES
] = "IO_METRIC_READ_BYTES",
2254 [CGROUP_IO_WRITE_BYTES
] = "IO_METRIC_WRITE_BYTES",
2255 [CGROUP_IO_READ_OPERATIONS
] = "IO_METRIC_READ_OPERATIONS",
2256 [CGROUP_IO_WRITE_OPERATIONS
] = "IO_METRIC_WRITE_OPERATIONS",
2261 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2262 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2263 * information and the complete data in structured fields. */
2265 (void) unit_get_cpu_usage(u
, &nsec
);
2266 if (nsec
!= NSEC_INFINITY
) {
2267 char buf
[FORMAT_TIMESPAN_MAX
] = "";
2269 /* Format the CPU time for inclusion in the structured log message */
2270 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2274 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2276 /* Format the CPU time for inclusion in the human language message string */
2277 format_timespan(buf
, sizeof(buf
), nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
);
2278 t
= strjoin("consumed ", buf
, " CPU time");
2284 message_parts
[n_message_parts
++] = t
;
2286 log_level
= raise_level(log_level
,
2287 nsec
> NOTICEWORTHY_CPU_NSEC
,
2288 nsec
> MENTIONWORTHY_CPU_NSEC
);
2291 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2292 char buf
[FORMAT_BYTES_MAX
] = "";
2293 uint64_t value
= UINT64_MAX
;
2295 assert(io_fields
[k
]);
2297 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2298 if (value
== UINT64_MAX
)
2301 have_io_accounting
= true;
2305 /* Format IO accounting data for inclusion in the structured log message */
2306 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2310 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2312 /* Format the IO accounting data for inclusion in the human language message string, but only
2313 * for the bytes counters (and not for the operations counters) */
2314 if (k
== CGROUP_IO_READ_BYTES
) {
2316 rr
= strjoin("read ", format_bytes(buf
, sizeof(buf
), value
), " from disk");
2321 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2323 wr
= strjoin("written ", format_bytes(buf
, sizeof(buf
), value
), " to disk");
2330 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2331 log_level
= raise_level(log_level
,
2332 value
> MENTIONWORTHY_IO_BYTES
,
2333 value
> NOTICEWORTHY_IO_BYTES
);
2336 if (have_io_accounting
) {
2339 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2341 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2346 k
= strdup("no IO");
2352 message_parts
[n_message_parts
++] = k
;
2356 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2357 char buf
[FORMAT_BYTES_MAX
] = "";
2358 uint64_t value
= UINT64_MAX
;
2360 assert(ip_fields
[m
]);
2362 (void) unit_get_ip_accounting(u
, m
, &value
);
2363 if (value
== UINT64_MAX
)
2366 have_ip_accounting
= true;
2370 /* Format IP accounting data for inclusion in the structured log message */
2371 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2375 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2377 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2378 * bytes counters (and not for the packets counters) */
2379 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2381 igress
= strjoin("received ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2386 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2388 egress
= strjoin("sent ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2395 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2396 log_level
= raise_level(log_level
,
2397 value
> MENTIONWORTHY_IP_BYTES
,
2398 value
> NOTICEWORTHY_IP_BYTES
);
2401 /* This check is here because it is the earliest point following all possible log_level assignments. If
2402 * log_level is assigned anywhere after this point, move this check. */
2403 if (!unit_log_level_test(u
, log_level
)) {
2408 if (have_ip_accounting
) {
2411 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2413 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2418 k
= strdup("no IP traffic");
2424 message_parts
[n_message_parts
++] = k
;
2428 /* Is there any accounting data available at all? */
2434 if (n_message_parts
== 0)
2435 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2437 _cleanup_free_
char *joined
= NULL
;
2439 message_parts
[n_message_parts
] = NULL
;
2441 joined
= strv_join(message_parts
, ", ");
2447 joined
[0] = ascii_toupper(joined
[0]);
2448 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2451 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2452 * and hence don't increase n_iovec for them */
2453 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2454 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2456 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2457 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2459 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2460 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2462 log_unit_struct_iovec(u
, log_level
, iovec
, n_iovec
+ 4);
2466 for (size_t i
= 0; i
< n_message_parts
; i
++)
2467 free(message_parts
[i
]);
2469 for (size_t i
= 0; i
< n_iovec
; i
++)
2470 free(iovec
[i
].iov_base
);
2476 static void unit_update_on_console(Unit
*u
) {
2481 b
= unit_needs_console(u
);
2482 if (u
->on_console
== b
)
2487 manager_ref_console(u
->manager
);
2489 manager_unref_console(u
->manager
);
2492 static void unit_emit_audit_start(Unit
*u
) {
2495 if (u
->type
!= UNIT_SERVICE
)
2498 /* Write audit record if we have just finished starting up */
2499 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2503 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2506 if (u
->type
!= UNIT_SERVICE
)
2510 /* Write audit record if we have just finished shutting down */
2511 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2512 u
->in_audit
= false;
2514 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2515 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2517 if (state
== UNIT_INACTIVE
)
2518 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2522 static bool unit_process_job(Job
*j
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2523 bool unexpected
= false;
2528 if (j
->state
== JOB_WAITING
)
2530 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2532 job_add_to_run_queue(j
);
2534 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2535 * hence needs to invalidate jobs. */
2540 case JOB_VERIFY_ACTIVE
:
2542 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2543 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2544 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2547 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2548 if (ns
== UNIT_FAILED
)
2549 result
= JOB_FAILED
;
2553 job_finish_and_invalidate(j
, result
, true, false);
2560 case JOB_RELOAD_OR_START
:
2561 case JOB_TRY_RELOAD
:
2563 if (j
->state
== JOB_RUNNING
) {
2564 if (ns
== UNIT_ACTIVE
)
2565 job_finish_and_invalidate(j
, (flags
& UNIT_NOTIFY_RELOAD_FAILURE
) ? JOB_FAILED
: JOB_DONE
, true, false);
2566 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2569 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2570 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2578 case JOB_TRY_RESTART
:
2580 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2581 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2582 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2584 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2590 assert_not_reached("Job type unknown");
2596 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2601 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2602 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2604 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2605 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2606 * remounted this function will be called too! */
2610 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2611 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2612 unit_add_to_dbus_queue(u
);
2614 /* Update systemd-oomd on the property/state change */
2616 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2618 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2619 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2620 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2621 * have the information on the property. Thus, indiscriminately send an update. */
2622 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2623 (void) manager_varlink_send_managed_oom_update(u
);
2626 /* Update timestamps for state changes */
2627 if (!MANAGER_IS_RELOADING(m
)) {
2628 dual_timestamp_get(&u
->state_change_timestamp
);
2630 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2631 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2632 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2633 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2635 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2636 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2637 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2638 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2641 /* Keep track of failed units */
2642 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2644 /* Make sure the cgroup and state files are always removed when we become inactive */
2645 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2646 SET_FLAG(u
->markers
,
2647 (1u << UNIT_MARKER_NEEDS_RELOAD
)|(1u << UNIT_MARKER_NEEDS_RESTART
),
2649 unit_prune_cgroup(u
);
2650 unit_unlink_state_files(u
);
2651 } else if (ns
!= os
&& ns
== UNIT_RELOADING
)
2652 SET_FLAG(u
->markers
, 1u << UNIT_MARKER_NEEDS_RELOAD
, false);
2654 unit_update_on_console(u
);
2656 if (!MANAGER_IS_RELOADING(m
)) {
2659 /* Let's propagate state changes to the job */
2661 unexpected
= unit_process_job(u
->job
, ns
, flags
);
2665 /* If this state change happened without being requested by a job, then let's retroactively start or
2666 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2667 * additional jobs just because something is already activated. */
2670 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2671 retroactively_start_dependencies(u
);
2672 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2673 retroactively_stop_dependencies(u
);
2676 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2677 log_unit_debug(u
, "Unit entered failed state.");
2679 if (!(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2680 unit_start_on_failure(u
, "OnFailure=", UNIT_ATOM_ON_FAILURE
, u
->on_failure_job_mode
);
2683 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2684 /* This unit just finished starting up */
2686 unit_emit_audit_start(u
);
2687 manager_send_unit_plymouth(m
, u
);
2690 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2691 /* This unit just stopped/failed. */
2693 unit_emit_audit_stop(u
, ns
);
2694 unit_log_resources(u
);
2697 if (ns
== UNIT_INACTIVE
&& !IN_SET(os
, UNIT_FAILED
, UNIT_INACTIVE
, UNIT_MAINTENANCE
) &&
2698 !(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2699 unit_start_on_failure(u
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
, u
->on_success_job_mode
);
2702 manager_recheck_journal(m
);
2703 manager_recheck_dbus(m
);
2705 unit_trigger_notify(u
);
2707 if (!MANAGER_IS_RELOADING(m
)) {
2708 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2709 reason
= strjoina("unit ", u
->id
, " failed");
2710 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2711 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2712 reason
= strjoina("unit ", u
->id
, " succeeded");
2713 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2717 /* And now, add the unit or depending units to various queues that will act on the new situation if
2718 * needed. These queues generally check for continuous state changes rather than events (like most of
2719 * the state propagation above), and do work deferred instead of instantly, since they typically
2720 * don't want to run during reloading, and usually involve checking combined state of multiple units
2723 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2724 /* Stop unneeded units and bound-by units regardless if going down was expected or not */
2725 check_unneeded_dependencies(u
);
2726 check_bound_by_dependencies(u
);
2728 /* Maybe someone wants us to remain up? */
2729 unit_submit_to_start_when_upheld_queue(u
);
2731 /* Maybe the unit should be GC'ed now? */
2732 unit_add_to_gc_queue(u
);
2735 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2736 /* Start uphold units regardless if going up was expected or not */
2737 check_uphold_dependencies(u
);
2739 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2740 unit_submit_to_stop_when_unneeded_queue(u
);
2742 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens
2743 * when something BindsTo= to a Type=oneshot unit, as these units go directly from starting to
2744 * inactive, without ever entering started.) */
2745 unit_submit_to_stop_when_bound_queue(u
);
2749 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2753 assert(pid_is_valid(pid
));
2755 /* Watch a specific PID */
2757 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2758 * opportunity to remove any stalled references to this PID as they can be created
2759 * easily (when watching a process which is not our direct child). */
2761 manager_unwatch_pid(u
->manager
, pid
);
2763 r
= set_ensure_allocated(&u
->pids
, NULL
);
2767 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2771 /* First try, let's add the unit keyed by "pid". */
2772 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2778 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2779 * to an array of Units rather than just a Unit), lists us already. */
2781 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2783 for (; array
[n
]; n
++)
2787 if (found
) /* Found it already? if so, do nothing */
2792 /* Allocate a new array */
2793 new_array
= new(Unit
*, n
+ 2);
2797 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2799 new_array
[n
+1] = NULL
;
2801 /* Add or replace the old array */
2802 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2813 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2820 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2824 assert(pid_is_valid(pid
));
2826 /* First let's drop the unit in case it's keyed as "pid". */
2827 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2829 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2830 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2832 /* Let's iterate through the array, dropping our own entry */
2835 for (size_t n
= 0; array
[n
]; n
++)
2837 array
[m
++] = array
[n
];
2841 /* The array is now empty, remove the entire entry */
2842 assert_se(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2847 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2850 void unit_unwatch_all_pids(Unit
*u
) {
2853 while (!set_isempty(u
->pids
))
2854 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2856 u
->pids
= set_free(u
->pids
);
2859 static void unit_tidy_watch_pids(Unit
*u
) {
2860 pid_t except1
, except2
;
2865 /* Cleans dead PIDs from our list */
2867 except1
= unit_main_pid(u
);
2868 except2
= unit_control_pid(u
);
2870 SET_FOREACH(e
, u
->pids
) {
2871 pid_t pid
= PTR_TO_PID(e
);
2873 if (pid
== except1
|| pid
== except2
)
2876 if (!pid_is_unwaited(pid
))
2877 unit_unwatch_pid(u
, pid
);
2881 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2887 unit_tidy_watch_pids(u
);
2888 unit_watch_all_pids(u
);
2890 /* If the PID set is empty now, then let's finish this off. */
2891 unit_synthesize_cgroup_empty_event(u
);
2896 int unit_enqueue_rewatch_pids(Unit
*u
) {
2901 if (!u
->cgroup_path
)
2904 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2907 if (r
> 0) /* On unified we can use proper notifications */
2910 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2911 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2912 * involves issuing kill(pid, 0) on all processes we watch. */
2914 if (!u
->rewatch_pids_event_source
) {
2915 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2917 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2919 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2921 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2923 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
2925 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2927 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2930 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2932 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2937 void unit_dequeue_rewatch_pids(Unit
*u
) {
2941 if (!u
->rewatch_pids_event_source
)
2944 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
2946 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
2948 u
->rewatch_pids_event_source
= sd_event_source_unref(u
->rewatch_pids_event_source
);
2951 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2953 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2957 case JOB_VERIFY_ACTIVE
:
2960 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2961 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
2966 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2967 * external events), hence it makes no sense to permit enqueuing such a request either. */
2968 return !u
->perpetual
;
2971 case JOB_TRY_RESTART
:
2972 return unit_can_stop(u
) && unit_can_start(u
);
2975 case JOB_TRY_RELOAD
:
2976 return unit_can_reload(u
);
2978 case JOB_RELOAD_OR_START
:
2979 return unit_can_reload(u
) && unit_can_start(u
);
2982 assert_not_reached("Invalid job type");
2986 int unit_add_dependency(
2991 UnitDependencyMask mask
) {
2993 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
2994 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
2995 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
2996 [UNIT_WANTS
] = UNIT_WANTED_BY
,
2997 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
2998 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
2999 [UNIT_UPHOLDS
] = UNIT_UPHELD_BY
,
3000 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
3001 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
3002 [UNIT_WANTED_BY
] = UNIT_WANTS
,
3003 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
3004 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
3005 [UNIT_UPHELD_BY
] = UNIT_UPHOLDS
,
3006 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
3007 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
3008 [UNIT_BEFORE
] = UNIT_AFTER
,
3009 [UNIT_AFTER
] = UNIT_BEFORE
,
3010 [UNIT_ON_SUCCESS
] = UNIT_ON_SUCCESS_OF
,
3011 [UNIT_ON_SUCCESS_OF
] = UNIT_ON_SUCCESS
,
3012 [UNIT_ON_FAILURE
] = UNIT_ON_FAILURE_OF
,
3013 [UNIT_ON_FAILURE_OF
] = UNIT_ON_FAILURE
,
3014 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
3015 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
3016 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3017 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3018 [UNIT_PROPAGATES_STOP_TO
] = UNIT_STOP_PROPAGATED_FROM
,
3019 [UNIT_STOP_PROPAGATED_FROM
] = UNIT_PROPAGATES_STOP_TO
,
3020 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
, /* symmetric! 👓 */
3021 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3022 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3023 [UNIT_IN_SLICE
] = UNIT_SLICE_OF
,
3024 [UNIT_SLICE_OF
] = UNIT_IN_SLICE
,
3026 Unit
*original_u
= u
, *original_other
= other
;
3027 UnitDependencyAtom a
;
3030 /* Helper to know whether sending a notification is necessary or not: if the dependency is already
3031 * there, no need to notify! */
3035 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3038 u
= unit_follow_merge(u
);
3039 other
= unit_follow_merge(other
);
3040 a
= unit_dependency_to_atom(d
);
3043 /* We won't allow dependencies on ourselves. We will not consider them an error however. */
3045 unit_maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
3049 /* Note that ordering a device unit after a unit is permitted since it allows to start its job
3050 * running timeout at a specific time. */
3051 if (FLAGS_SET(a
, UNIT_ATOM_BEFORE
) && other
->type
== UNIT_DEVICE
) {
3052 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3056 if (FLAGS_SET(a
, UNIT_ATOM_ON_FAILURE
) && !UNIT_VTABLE(u
)->can_fail
) {
3057 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3061 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERS
) && !UNIT_VTABLE(u
)->can_trigger
)
3062 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3063 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3064 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERED_BY
) && !UNIT_VTABLE(other
)->can_trigger
)
3065 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3066 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3068 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && other
->type
!= UNIT_SLICE
)
3069 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3070 "Requested dependency Slice=%s refused (%s is not a slice unit).", other
->id
, other
->id
);
3071 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && u
->type
!= UNIT_SLICE
)
3072 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3073 "Requested dependency SliceOf=%s refused (%s is not a slice unit).", other
->id
, u
->id
);
3075 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && !UNIT_HAS_CGROUP_CONTEXT(u
))
3076 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3077 "Requested dependency Slice=%s refused (%s is not a cgroup unit).", other
->id
, u
->id
);
3079 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && !UNIT_HAS_CGROUP_CONTEXT(other
))
3080 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3081 "Requested dependency SliceOf=%s refused (%s is not a cgroup unit).", other
->id
, other
->id
);
3083 r
= unit_add_dependency_hashmap(&u
->dependencies
, d
, other
, mask
, 0);
3088 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
3089 r
= unit_add_dependency_hashmap(&other
->dependencies
, inverse_table
[d
], u
, 0, mask
);
3096 if (add_reference
) {
3097 r
= unit_add_dependency_hashmap(&u
->dependencies
, UNIT_REFERENCES
, other
, mask
, 0);
3103 r
= unit_add_dependency_hashmap(&other
->dependencies
, UNIT_REFERENCED_BY
, u
, 0, mask
);
3111 unit_add_to_dbus_queue(u
);
3116 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3121 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3125 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3128 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3136 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3143 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3145 _cleanup_free_
char *i
= NULL
;
3147 r
= unit_name_to_prefix(u
->id
, &i
);
3151 r
= unit_name_replace_instance(name
, i
, buf
);
3160 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3161 _cleanup_free_
char *buf
= NULL
;
3168 r
= resolve_template(u
, name
, &buf
, &name
);
3172 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3176 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3179 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3180 _cleanup_free_
char *buf
= NULL
;
3187 r
= resolve_template(u
, name
, &buf
, &name
);
3191 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3195 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3198 int set_unit_path(const char *p
) {
3199 /* This is mostly for debug purposes */
3200 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
3206 char *unit_dbus_path(Unit
*u
) {
3212 return unit_dbus_path_from_name(u
->id
);
3215 char *unit_dbus_path_invocation_id(Unit
*u
) {
3218 if (sd_id128_is_null(u
->invocation_id
))
3221 return unit_dbus_path_from_name(u
->invocation_id_string
);
3224 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3229 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3231 if (sd_id128_equal(u
->invocation_id
, id
))
3234 if (!sd_id128_is_null(u
->invocation_id
))
3235 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3237 if (sd_id128_is_null(id
)) {
3242 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3246 u
->invocation_id
= id
;
3247 sd_id128_to_string(id
, u
->invocation_id_string
);
3249 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3256 u
->invocation_id
= SD_ID128_NULL
;
3257 u
->invocation_id_string
[0] = 0;
3261 int unit_set_slice(Unit
*u
, Unit
*slice
, UnitDependencyMask mask
) {
3267 /* Sets the unit slice if it has not been set before. Is extra careful, to only allow this for units
3268 * that actually have a cgroup context. Also, we don't allow to set this for slices (since the parent
3269 * slice is derived from the name). Make sure the unit we set is actually a slice. */
3271 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3274 if (u
->type
== UNIT_SLICE
)
3277 if (unit_active_state(u
) != UNIT_INACTIVE
)
3280 if (slice
->type
!= UNIT_SLICE
)
3283 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3284 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3287 if (UNIT_GET_SLICE(u
) == slice
)
3290 /* Disallow slice changes if @u is already bound to cgroups */
3291 if (UNIT_GET_SLICE(u
) && u
->cgroup_realized
)
3294 r
= unit_add_dependency(u
, UNIT_IN_SLICE
, slice
, true, mask
);
3301 int unit_set_default_slice(Unit
*u
) {
3302 const char *slice_name
;
3308 if (UNIT_GET_SLICE(u
))
3312 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3314 /* Implicitly place all instantiated units in their
3315 * own per-template slice */
3317 r
= unit_name_to_prefix(u
->id
, &prefix
);
3321 /* The prefix is already escaped, but it might include
3322 * "-" which has a special meaning for slice units,
3323 * hence escape it here extra. */
3324 escaped
= unit_name_escape(prefix
);
3328 if (MANAGER_IS_SYSTEM(u
->manager
))
3329 slice_name
= strjoina("system-", escaped
, ".slice");
3331 slice_name
= strjoina("app-", escaped
, ".slice");
3333 } else if (unit_is_extrinsic(u
))
3334 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3335 * the root slice. They don't really belong in one of the subslices. */
3336 slice_name
= SPECIAL_ROOT_SLICE
;
3338 else if (MANAGER_IS_SYSTEM(u
->manager
))
3339 slice_name
= SPECIAL_SYSTEM_SLICE
;
3341 slice_name
= SPECIAL_APP_SLICE
;
3343 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3347 return unit_set_slice(u
, slice
, UNIT_DEPENDENCY_FILE
);
3350 const char *unit_slice_name(Unit
*u
) {
3354 slice
= UNIT_GET_SLICE(u
);
3361 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3362 _cleanup_free_
char *t
= NULL
;
3369 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3372 if (unit_has_name(u
, t
))
3375 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3376 assert(r
< 0 || *_found
!= u
);
3380 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3381 const char *new_owner
;
3388 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3390 bus_log_parse_error(r
);
3394 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3395 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3400 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3401 const sd_bus_error
*e
;
3402 const char *new_owner
;
3409 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3411 e
= sd_bus_message_get_error(message
);
3413 if (!sd_bus_error_has_name(e
, "org.freedesktop.DBus.Error.NameHasNoOwner"))
3414 log_unit_error(u
, "Unexpected error response from GetNameOwner(): %s", e
->message
);
3418 r
= sd_bus_message_read(message
, "s", &new_owner
);
3420 return bus_log_parse_error(r
);
3422 assert(!isempty(new_owner
));
3425 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3426 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3431 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3439 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3442 match
= strjoina("type='signal',"
3443 "sender='org.freedesktop.DBus',"
3444 "path='/org/freedesktop/DBus',"
3445 "interface='org.freedesktop.DBus',"
3446 "member='NameOwnerChanged',"
3447 "arg0='", name
, "'");
3449 r
= sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3453 r
= sd_bus_call_method_async(
3455 &u
->get_name_owner_slot
,
3456 "org.freedesktop.DBus",
3457 "/org/freedesktop/DBus",
3458 "org.freedesktop.DBus",
3460 get_name_owner_handler
,
3464 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3468 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3472 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3478 /* Watch a specific name on the bus. We only support one unit
3479 * watching each name for now. */
3481 if (u
->manager
->api_bus
) {
3482 /* If the bus is already available, install the match directly.
3483 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3484 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3486 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3489 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3491 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3492 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3493 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3499 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3503 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3504 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3505 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3508 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3509 _cleanup_free_
char *e
= NULL
;
3515 /* Adds in links to the device node that this unit is based on */
3519 if (!is_device_path(what
))
3522 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3523 if (!unit_type_supported(UNIT_DEVICE
))
3526 r
= unit_name_from_path(what
, ".device", &e
);
3530 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3534 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3535 dep
= UNIT_BINDS_TO
;
3537 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3538 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3539 device
, true, mask
);
3542 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3543 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3551 if (!path_startswith(what
, "/dev/"))
3554 /* If we don't support devices, then also don't bother with blockdev@.target */
3555 if (!unit_type_supported(UNIT_DEVICE
))
3558 r
= unit_name_path_escape(what
, &escaped
);
3562 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3566 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3569 int unit_coldplug(Unit
*u
) {
3576 /* Make sure we don't enter a loop, when coldplugging recursively. */
3580 u
->coldplugged
= true;
3582 STRV_FOREACH(i
, u
->deserialized_refs
) {
3583 q
= bus_unit_track_add_name(u
, *i
);
3584 if (q
< 0 && r
>= 0)
3587 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3589 if (UNIT_VTABLE(u
)->coldplug
) {
3590 q
= UNIT_VTABLE(u
)->coldplug(u
);
3591 if (q
< 0 && r
>= 0)
3595 uj
= u
->job
?: u
->nop_job
;
3597 q
= job_coldplug(uj
);
3598 if (q
< 0 && r
>= 0)
3605 void unit_catchup(Unit
*u
) {
3608 if (UNIT_VTABLE(u
)->catchup
)
3609 UNIT_VTABLE(u
)->catchup(u
);
3612 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3618 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3619 * are never out-of-date. */
3620 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3623 if (stat(path
, &st
) < 0)
3624 /* What, cannot access this anymore? */
3628 /* For masked files check if they are still so */
3629 return !null_or_empty(&st
);
3631 /* For non-empty files check the mtime */
3632 return timespec_load(&st
.st_mtim
) > mtime
;
3637 bool unit_need_daemon_reload(Unit
*u
) {
3638 _cleanup_strv_free_
char **t
= NULL
;
3643 /* For unit files, we allow masking… */
3644 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3645 u
->load_state
== UNIT_MASKED
))
3648 /* Source paths should not be masked… */
3649 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3652 if (u
->load_state
== UNIT_LOADED
)
3653 (void) unit_find_dropin_paths(u
, &t
);
3654 if (!strv_equal(u
->dropin_paths
, t
))
3657 /* … any drop-ins that are masked are simply omitted from the list. */
3658 STRV_FOREACH(path
, u
->dropin_paths
)
3659 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3665 void unit_reset_failed(Unit
*u
) {
3668 if (UNIT_VTABLE(u
)->reset_failed
)
3669 UNIT_VTABLE(u
)->reset_failed(u
);
3671 ratelimit_reset(&u
->start_ratelimit
);
3672 u
->start_limit_hit
= false;
3675 Unit
*unit_following(Unit
*u
) {
3678 if (UNIT_VTABLE(u
)->following
)
3679 return UNIT_VTABLE(u
)->following(u
);
3684 bool unit_stop_pending(Unit
*u
) {
3687 /* This call does check the current state of the unit. It's
3688 * hence useful to be called from state change calls of the
3689 * unit itself, where the state isn't updated yet. This is
3690 * different from unit_inactive_or_pending() which checks both
3691 * the current state and for a queued job. */
3693 return unit_has_job_type(u
, JOB_STOP
);
3696 bool unit_inactive_or_pending(Unit
*u
) {
3699 /* Returns true if the unit is inactive or going down */
3701 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3704 if (unit_stop_pending(u
))
3710 bool unit_active_or_pending(Unit
*u
) {
3713 /* Returns true if the unit is active or going up */
3715 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3719 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3725 bool unit_will_restart_default(Unit
*u
) {
3728 return unit_has_job_type(u
, JOB_START
);
3731 bool unit_will_restart(Unit
*u
) {
3734 if (!UNIT_VTABLE(u
)->will_restart
)
3737 return UNIT_VTABLE(u
)->will_restart(u
);
3740 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3742 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3743 assert(SIGNAL_VALID(signo
));
3745 if (!UNIT_VTABLE(u
)->kill
)
3748 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3751 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3752 _cleanup_set_free_ Set
*pid_set
= NULL
;
3755 pid_set
= set_new(NULL
);
3759 /* Exclude the main/control pids from being killed via the cgroup */
3761 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3766 if (control_pid
> 0) {
3767 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3772 return TAKE_PTR(pid_set
);
3775 static int kill_common_log(pid_t pid
, int signo
, void *userdata
) {
3776 _cleanup_free_
char *comm
= NULL
;
3781 (void) get_process_comm(pid
, &comm
);
3782 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
3783 signal_to_string(signo
), pid
, strna(comm
));
3788 int unit_kill_common(
3794 sd_bus_error
*error
) {
3797 bool killed
= false;
3799 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
3800 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
3801 * stop a service ourselves. */
3803 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3805 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3807 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3810 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3811 if (control_pid
< 0)
3812 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3813 if (control_pid
== 0)
3814 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3817 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3818 if (control_pid
> 0) {
3819 _cleanup_free_
char *comm
= NULL
;
3820 (void) get_process_comm(control_pid
, &comm
);
3822 if (kill(control_pid
, signo
) < 0) {
3823 /* Report this failure both to the logs and to the client */
3824 sd_bus_error_set_errnof(
3826 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
3827 signal_to_string(signo
), control_pid
, strna(comm
));
3828 r
= log_unit_warning_errno(
3830 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
3831 signal_to_string(signo
), control_pid
, strna(comm
));
3833 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
3834 signal_to_string(signo
), control_pid
, strna(comm
));
3839 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3841 _cleanup_free_
char *comm
= NULL
;
3842 (void) get_process_comm(main_pid
, &comm
);
3844 if (kill(main_pid
, signo
) < 0) {
3846 sd_bus_error_set_errnof(
3848 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
3849 signal_to_string(signo
), main_pid
, strna(comm
));
3851 r
= log_unit_warning_errno(
3853 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
3854 signal_to_string(signo
), main_pid
, strna(comm
));
3856 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
3857 signal_to_string(signo
), main_pid
, strna(comm
));
3862 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3863 _cleanup_set_free_ Set
*pid_set
= NULL
;
3866 /* Exclude the main/control pids from being killed via the cgroup */
3867 pid_set
= unit_pid_set(main_pid
, control_pid
);
3871 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
3873 if (!IN_SET(q
, -ESRCH
, -ENOENT
)) {
3875 sd_bus_error_set_errnof(
3877 "Failed to send signal SIG%s to auxiliary processes: %m",
3878 signal_to_string(signo
));
3880 r
= log_unit_warning_errno(
3882 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
3883 signal_to_string(signo
));
3889 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
3890 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
3891 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
3896 int unit_following_set(Unit
*u
, Set
**s
) {
3900 if (UNIT_VTABLE(u
)->following_set
)
3901 return UNIT_VTABLE(u
)->following_set(u
, s
);
3907 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3912 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3913 r
= unit_file_get_state(
3914 u
->manager
->unit_file_scope
,
3917 &u
->unit_file_state
);
3919 u
->unit_file_state
= UNIT_FILE_BAD
;
3922 return u
->unit_file_state
;
3925 int unit_get_unit_file_preset(Unit
*u
) {
3928 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3929 u
->unit_file_preset
= unit_file_query_preset(
3930 u
->manager
->unit_file_scope
,
3932 basename(u
->fragment_path
),
3935 return u
->unit_file_preset
;
3938 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
3944 unit_ref_unset(ref
);
3946 ref
->source
= source
;
3947 ref
->target
= target
;
3948 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
3952 void unit_ref_unset(UnitRef
*ref
) {
3958 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
3959 * be unreferenced now. */
3960 unit_add_to_gc_queue(ref
->target
);
3962 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
3963 ref
->source
= ref
->target
= NULL
;
3966 static int user_from_unit_name(Unit
*u
, char **ret
) {
3968 static const uint8_t hash_key
[] = {
3969 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
3970 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
3973 _cleanup_free_
char *n
= NULL
;
3976 r
= unit_name_to_prefix(u
->id
, &n
);
3980 if (valid_user_group_name(n
, 0)) {
3985 /* If we can't use the unit name as a user name, then let's hash it and use that */
3986 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
3992 int unit_patch_contexts(Unit
*u
) {
3999 /* Patch in the manager defaults into the exec and cgroup
4000 * contexts, _after_ the rest of the settings have been
4003 ec
= unit_get_exec_context(u
);
4005 /* This only copies in the ones that need memory */
4006 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
4007 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4008 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4013 if (MANAGER_IS_USER(u
->manager
) &&
4014 !ec
->working_directory
) {
4016 r
= get_home_dir(&ec
->working_directory
);
4020 /* Allow user services to run, even if the
4021 * home directory is missing */
4022 ec
->working_directory_missing_ok
= true;
4025 if (ec
->private_devices
)
4026 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4028 if (ec
->protect_kernel_modules
)
4029 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4031 if (ec
->protect_kernel_logs
)
4032 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4034 if (ec
->protect_clock
)
4035 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4037 if (ec
->dynamic_user
) {
4039 r
= user_from_unit_name(u
, &ec
->user
);
4045 ec
->group
= strdup(ec
->user
);
4050 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4051 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4054 ec
->private_tmp
= true;
4055 ec
->remove_ipc
= true;
4056 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4057 if (ec
->protect_home
== PROTECT_HOME_NO
)
4058 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4060 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4062 ec
->no_new_privileges
= true;
4063 ec
->restrict_suid_sgid
= true;
4067 cc
= unit_get_cgroup_context(u
);
4070 if (ec
->private_devices
&&
4071 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4072 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4074 if ((ec
->root_image
|| !LIST_IS_EMPTY(ec
->mount_images
)) &&
4075 (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
)) {
4078 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4079 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4080 r
= cgroup_add_device_allow(cc
, p
, "rw");
4084 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4085 r
= cgroup_add_device_allow(cc
, p
, "rwm");
4090 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4091 * Same for mapper and verity. */
4092 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4093 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4099 if (ec
->protect_clock
) {
4100 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4109 ExecContext
*unit_get_exec_context(const Unit
*u
) {
4116 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4120 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4123 KillContext
*unit_get_kill_context(Unit
*u
) {
4130 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4134 return (KillContext
*) ((uint8_t*) u
+ offset
);
4137 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4143 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4147 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4150 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4156 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4160 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4163 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4166 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4169 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4170 return u
->manager
->lookup_paths
.transient
;
4172 if (flags
& UNIT_PERSISTENT
)
4173 return u
->manager
->lookup_paths
.persistent_control
;
4175 if (flags
& UNIT_RUNTIME
)
4176 return u
->manager
->lookup_paths
.runtime_control
;
4181 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4187 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4188 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4189 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4190 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4191 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4194 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4195 ret
= specifier_escape(s
);
4202 if (flags
& UNIT_ESCAPE_C
) {
4215 return ret
?: (char*) s
;
4218 return ret
?: strdup(s
);
4221 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4222 _cleanup_free_
char *result
= NULL
;
4226 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4227 * way suitable for ExecStart= stanzas */
4229 STRV_FOREACH(i
, l
) {
4230 _cleanup_free_
char *buf
= NULL
;
4235 p
= unit_escape_setting(*i
, flags
, &buf
);
4239 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4240 if (!GREEDY_REALLOC(result
, n
+ a
+ 1))
4254 if (!GREEDY_REALLOC(result
, n
+ 1))
4259 return TAKE_PTR(result
);
4262 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4263 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4264 const char *dir
, *wrapped
;
4271 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4274 data
= unit_escape_setting(data
, flags
, &escaped
);
4278 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4279 * previous section header is the same */
4281 if (flags
& UNIT_PRIVATE
) {
4282 if (!UNIT_VTABLE(u
)->private_section
)
4285 if (!u
->transient_file
|| u
->last_section_private
< 0)
4286 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4287 else if (u
->last_section_private
== 0)
4288 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4290 if (!u
->transient_file
|| u
->last_section_private
< 0)
4291 data
= strjoina("[Unit]\n", data
);
4292 else if (u
->last_section_private
> 0)
4293 data
= strjoina("\n[Unit]\n", data
);
4296 if (u
->transient_file
) {
4297 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4298 * write to the transient unit file. */
4299 fputs(data
, u
->transient_file
);
4301 if (!endswith(data
, "\n"))
4302 fputc('\n', u
->transient_file
);
4304 /* Remember which section we wrote this entry to */
4305 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4309 dir
= unit_drop_in_dir(u
, flags
);
4313 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4314 "# or an equivalent operation. Do not edit.\n",
4318 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4322 (void) mkdir_p_label(p
, 0755);
4324 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4325 * recreate the cache after every drop-in we write. */
4326 if (u
->manager
->unit_path_cache
) {
4327 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4332 r
= write_string_file_atomic_label(q
, wrapped
);
4336 r
= strv_push(&u
->dropin_paths
, q
);
4341 strv_uniq(u
->dropin_paths
);
4343 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4348 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4349 _cleanup_free_
char *p
= NULL
;
4357 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4360 va_start(ap
, format
);
4361 r
= vasprintf(&p
, format
, ap
);
4367 return unit_write_setting(u
, flags
, name
, p
);
4370 int unit_make_transient(Unit
*u
) {
4371 _cleanup_free_
char *path
= NULL
;
4376 if (!UNIT_VTABLE(u
)->can_transient
)
4379 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4381 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4385 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4386 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4388 RUN_WITH_UMASK(0022) {
4389 f
= fopen(path
, "we");
4394 safe_fclose(u
->transient_file
);
4395 u
->transient_file
= f
;
4397 free_and_replace(u
->fragment_path
, path
);
4399 u
->source_path
= mfree(u
->source_path
);
4400 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4401 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4403 u
->load_state
= UNIT_STUB
;
4405 u
->transient
= true;
4407 unit_add_to_dbus_queue(u
);
4408 unit_add_to_gc_queue(u
);
4410 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4416 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4417 _cleanup_free_
char *comm
= NULL
;
4419 (void) get_process_comm(pid
, &comm
);
4421 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4422 only, like for example systemd's own PAM stub process. */
4423 if (comm
&& comm
[0] == '(')
4426 log_unit_notice(userdata
,
4427 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4430 signal_to_string(sig
));
4435 static int operation_to_signal(const KillContext
*c
, KillOperation k
, bool *noteworthy
) {
4440 case KILL_TERMINATE
:
4441 case KILL_TERMINATE_AND_LOG
:
4442 *noteworthy
= false;
4443 return c
->kill_signal
;
4446 *noteworthy
= false;
4447 return restart_kill_signal(c
);
4451 return c
->final_kill_signal
;
4455 return c
->watchdog_signal
;
4458 assert_not_reached("KillOperation unknown");
4462 int unit_kill_context(
4468 bool main_pid_alien
) {
4470 bool wait_for_exit
= false, send_sighup
;
4471 cg_kill_log_func_t log_func
= NULL
;
4477 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
4478 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
4479 * which is used for user-requested killing of unit processes. */
4481 if (c
->kill_mode
== KILL_NONE
)
4485 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4487 log_func
= log_kill
;
4491 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4496 log_func(main_pid
, sig
, u
);
4498 r
= kill_and_sigcont(main_pid
, sig
);
4499 if (r
< 0 && r
!= -ESRCH
) {
4500 _cleanup_free_
char *comm
= NULL
;
4501 (void) get_process_comm(main_pid
, &comm
);
4503 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4505 if (!main_pid_alien
)
4506 wait_for_exit
= true;
4508 if (r
!= -ESRCH
&& send_sighup
)
4509 (void) kill(main_pid
, SIGHUP
);
4513 if (control_pid
> 0) {
4515 log_func(control_pid
, sig
, u
);
4517 r
= kill_and_sigcont(control_pid
, sig
);
4518 if (r
< 0 && r
!= -ESRCH
) {
4519 _cleanup_free_
char *comm
= NULL
;
4520 (void) get_process_comm(control_pid
, &comm
);
4522 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4524 wait_for_exit
= true;
4526 if (r
!= -ESRCH
&& send_sighup
)
4527 (void) kill(control_pid
, SIGHUP
);
4531 if (u
->cgroup_path
&&
4532 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4533 _cleanup_set_free_ Set
*pid_set
= NULL
;
4535 /* Exclude the main/control pids from being killed via the cgroup */
4536 pid_set
= unit_pid_set(main_pid
, control_pid
);
4540 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4542 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4546 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4547 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
4551 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4552 * we are running in a container or if this is a delegation unit, simply because cgroup
4553 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4554 * of containers it can be confused easily by left-over directories in the cgroup — which
4555 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4556 * there we get proper events. Hence rely on them. */
4558 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4559 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4560 wait_for_exit
= true;
4565 pid_set
= unit_pid_set(main_pid
, control_pid
);
4569 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4578 return wait_for_exit
;
4581 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4587 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these
4588 * paths in the unit (from the path to the UnitDependencyInfo structure indicating how to the
4589 * dependency came to be). However, we build a prefix table for all possible prefixes so that new
4590 * appearing mount units can easily determine which units to make themselves a dependency of. */
4592 if (!path_is_absolute(path
))
4595 if (hashmap_contains(u
->requires_mounts_for
, path
)) /* Exit quickly if the path is already covered. */
4598 _cleanup_free_
char *p
= strdup(path
);
4602 /* Use the canonical form of the path as the stored key. We call path_is_normalized()
4603 * only after simplification, since path_is_normalized() rejects paths with '.'.
4604 * path_is_normalized() also verifies that the path fits in PATH_MAX. */
4605 path
= path_simplify(p
);
4607 if (!path_is_normalized(path
))
4610 UnitDependencyInfo di
= {
4614 r
= hashmap_ensure_put(&u
->requires_mounts_for
, &path_hash_ops
, p
, di
.data
);
4618 TAKE_PTR(p
); /* path remains a valid pointer to the string stored in the hashmap */
4620 char prefix
[strlen(path
) + 1];
4621 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4624 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4626 _cleanup_free_
char *q
= NULL
;
4628 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4640 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4656 int unit_setup_exec_runtime(Unit
*u
) {
4662 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4665 /* Check if there already is an ExecRuntime for this unit? */
4666 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4670 /* Try to get it from somebody else */
4671 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_JOINS_NAMESPACE_OF
) {
4672 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4677 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4680 int unit_setup_dynamic_creds(Unit
*u
) {
4682 DynamicCreds
*dcreds
;
4687 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4689 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4691 ec
= unit_get_exec_context(u
);
4694 if (!ec
->dynamic_user
)
4697 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4700 bool unit_type_supported(UnitType t
) {
4701 if (_unlikely_(t
< 0))
4703 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4706 if (!unit_vtable
[t
]->supported
)
4709 return unit_vtable
[t
]->supported();
4712 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4718 if (!unit_log_level_test(u
, LOG_NOTICE
))
4721 r
= dir_is_empty(where
);
4722 if (r
> 0 || r
== -ENOTDIR
)
4725 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4729 log_unit_struct(u
, LOG_NOTICE
,
4730 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4731 LOG_UNIT_INVOCATION_ID(u
),
4732 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4736 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4737 _cleanup_free_
char *canonical_where
= NULL
;
4743 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
4745 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4749 /* We will happily ignore a trailing slash (or any redundant slashes) */
4750 if (path_equal(where
, canonical_where
))
4753 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4754 log_unit_struct(u
, LOG_ERR
,
4755 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4756 LOG_UNIT_INVOCATION_ID(u
),
4757 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4763 bool unit_is_pristine(Unit
*u
) {
4766 /* Check if the unit already exists or is already around,
4767 * in a number of different ways. Note that to cater for unit
4768 * types such as slice, we are generally fine with units that
4769 * are marked UNIT_LOADED even though nothing was actually
4770 * loaded, as those unit types don't require a file on disk. */
4772 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4775 !strv_isempty(u
->dropin_paths
) ||
4780 pid_t
unit_control_pid(Unit
*u
) {
4783 if (UNIT_VTABLE(u
)->control_pid
)
4784 return UNIT_VTABLE(u
)->control_pid(u
);
4789 pid_t
unit_main_pid(Unit
*u
) {
4792 if (UNIT_VTABLE(u
)->main_pid
)
4793 return UNIT_VTABLE(u
)->main_pid(u
);
4798 static void unit_unref_uid_internal(
4802 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4806 assert(_manager_unref_uid
);
4808 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4809 * gid_t are actually the same time, with the same validity rules.
4811 * Drops a reference to UID/GID from a unit. */
4813 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4814 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4816 if (!uid_is_valid(*ref_uid
))
4819 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4820 *ref_uid
= UID_INVALID
;
4823 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4824 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4827 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4828 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4831 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4834 unit_unref_uid(u
, destroy_now
);
4835 unit_unref_gid(u
, destroy_now
);
4838 static int unit_ref_uid_internal(
4843 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4849 assert(uid_is_valid(uid
));
4850 assert(_manager_ref_uid
);
4852 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4853 * are actually the same type, and have the same validity rules.
4855 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4856 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4859 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4860 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4862 if (*ref_uid
== uid
)
4865 if (uid_is_valid(*ref_uid
)) /* Already set? */
4868 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4876 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4877 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4880 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4881 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4884 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4889 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4891 if (uid_is_valid(uid
)) {
4892 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4897 if (gid_is_valid(gid
)) {
4898 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4901 unit_unref_uid(u
, false);
4907 return r
> 0 || q
> 0;
4910 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4916 c
= unit_get_exec_context(u
);
4918 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4920 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4925 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4930 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4931 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4932 * objects when no service references the UID/GID anymore. */
4934 r
= unit_ref_uid_gid(u
, uid
, gid
);
4936 unit_add_to_dbus_queue(u
);
4939 int unit_acquire_invocation_id(Unit
*u
) {
4945 r
= sd_id128_randomize(&id
);
4947 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
4949 r
= unit_set_invocation_id(u
, id
);
4951 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
4953 unit_add_to_dbus_queue(u
);
4957 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
4963 /* Copy parameters from manager */
4964 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
4968 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
4969 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
4970 p
->prefix
= u
->manager
->prefix
;
4971 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
4973 /* Copy parameters from unit */
4974 p
->cgroup_path
= u
->cgroup_path
;
4975 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
4977 p
->received_credentials
= u
->manager
->received_credentials
;
4982 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
4988 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
4989 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
4991 (void) unit_realize_cgroup(u
);
4993 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
4997 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
);
4998 (void) ignore_signals(SIGPIPE
);
5000 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5002 if (u
->cgroup_path
) {
5003 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5005 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", u
->cgroup_path
);
5013 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5020 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5024 int ret
= EXIT_SUCCESS
;
5027 STRV_FOREACH(i
, paths
) {
5028 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5030 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5038 r
= unit_watch_pid(u
, pid
, true);
5046 static void unit_update_dependency_mask(Hashmap
*deps
, Unit
*other
, UnitDependencyInfo di
) {
5050 if (di
.origin_mask
== 0 && di
.destination_mask
== 0)
5051 /* No bit set anymore, let's drop the whole entry */
5052 assert_se(hashmap_remove(deps
, other
));
5054 /* Mask was reduced, let's update the entry */
5055 assert_se(hashmap_update(deps
, other
, di
.data
) == 0);
5058 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5062 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5067 HASHMAP_FOREACH(deps
, u
->dependencies
) {
5071 UnitDependencyInfo di
;
5076 HASHMAP_FOREACH_KEY(di
.data
, other
, deps
) {
5077 Hashmap
*other_deps
;
5079 if (FLAGS_SET(~mask
, di
.origin_mask
))
5082 di
.origin_mask
&= ~mask
;
5083 unit_update_dependency_mask(deps
, other
, di
);
5085 /* We updated the dependency from our unit to the other unit now. But most
5086 * dependencies imply a reverse dependency. Hence, let's delete that one
5087 * too. For that we go through all dependency types on the other unit and
5088 * delete all those which point to us and have the right mask set. */
5090 HASHMAP_FOREACH(other_deps
, other
->dependencies
) {
5091 UnitDependencyInfo dj
;
5093 dj
.data
= hashmap_get(other_deps
, u
);
5094 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5097 dj
.destination_mask
&= ~mask
;
5098 unit_update_dependency_mask(other_deps
, u
, dj
);
5101 unit_add_to_gc_queue(other
);
5111 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5118 if (MANAGER_IS_SYSTEM(u
->manager
))
5119 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5121 _cleanup_free_
char *user_path
= NULL
;
5122 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5125 p
= strjoin(user_path
, u
->id
);
5135 static int unit_export_invocation_id(Unit
*u
) {
5136 _cleanup_free_
char *p
= NULL
;
5141 if (u
->exported_invocation_id
)
5144 if (sd_id128_is_null(u
->invocation_id
))
5147 r
= unit_get_invocation_path(u
, &p
);
5149 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5151 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5153 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5155 u
->exported_invocation_id
= true;
5159 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5167 if (u
->exported_log_level_max
)
5170 if (c
->log_level_max
< 0)
5173 assert(c
->log_level_max
<= 7);
5175 buf
[0] = '0' + c
->log_level_max
;
5178 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5179 r
= symlink_atomic(buf
, p
);
5181 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5183 u
->exported_log_level_max
= true;
5187 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5188 _cleanup_close_
int fd
= -1;
5189 struct iovec
*iovec
;
5196 if (u
->exported_log_extra_fields
)
5199 if (c
->n_log_extra_fields
<= 0)
5202 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5203 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5205 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5206 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5208 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5209 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5212 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5213 pattern
= strjoina(p
, ".XXXXXX");
5215 fd
= mkostemp_safe(pattern
);
5217 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5219 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5221 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5225 (void) fchmod(fd
, 0644);
5227 if (rename(pattern
, p
) < 0) {
5228 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5232 u
->exported_log_extra_fields
= true;
5236 (void) unlink(pattern
);
5240 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5241 _cleanup_free_
char *buf
= NULL
;
5248 if (u
->exported_log_ratelimit_interval
)
5251 if (c
->log_ratelimit_interval_usec
== 0)
5254 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5256 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5259 r
= symlink_atomic(buf
, p
);
5261 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5263 u
->exported_log_ratelimit_interval
= true;
5267 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5268 _cleanup_free_
char *buf
= NULL
;
5275 if (u
->exported_log_ratelimit_burst
)
5278 if (c
->log_ratelimit_burst
== 0)
5281 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5283 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5286 r
= symlink_atomic(buf
, p
);
5288 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5290 u
->exported_log_ratelimit_burst
= true;
5294 void unit_export_state_files(Unit
*u
) {
5295 const ExecContext
*c
;
5302 if (MANAGER_IS_TEST_RUN(u
->manager
))
5305 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5306 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5307 * the IPC system itself and PID 1 also log to the journal.
5309 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5310 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5311 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5312 * namespace at least.
5314 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5315 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5318 (void) unit_export_invocation_id(u
);
5320 if (!MANAGER_IS_SYSTEM(u
->manager
))
5323 c
= unit_get_exec_context(u
);
5325 (void) unit_export_log_level_max(u
, c
);
5326 (void) unit_export_log_extra_fields(u
, c
);
5327 (void) unit_export_log_ratelimit_interval(u
, c
);
5328 (void) unit_export_log_ratelimit_burst(u
, c
);
5332 void unit_unlink_state_files(Unit
*u
) {
5340 /* Undoes the effect of unit_export_state() */
5342 if (u
->exported_invocation_id
) {
5343 _cleanup_free_
char *invocation_path
= NULL
;
5344 int r
= unit_get_invocation_path(u
, &invocation_path
);
5346 (void) unlink(invocation_path
);
5347 u
->exported_invocation_id
= false;
5351 if (!MANAGER_IS_SYSTEM(u
->manager
))
5354 if (u
->exported_log_level_max
) {
5355 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5358 u
->exported_log_level_max
= false;
5361 if (u
->exported_log_extra_fields
) {
5362 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5365 u
->exported_log_extra_fields
= false;
5368 if (u
->exported_log_ratelimit_interval
) {
5369 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5372 u
->exported_log_ratelimit_interval
= false;
5375 if (u
->exported_log_ratelimit_burst
) {
5376 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5379 u
->exported_log_ratelimit_burst
= false;
5383 int unit_prepare_exec(Unit
*u
) {
5388 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5389 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5390 r
= bpf_firewall_load_custom(u
);
5394 /* Prepares everything so that we can fork of a process for this unit */
5396 (void) unit_realize_cgroup(u
);
5398 if (u
->reset_accounting
) {
5399 (void) unit_reset_accounting(u
);
5400 u
->reset_accounting
= false;
5403 unit_export_state_files(u
);
5405 r
= unit_setup_exec_runtime(u
);
5409 r
= unit_setup_dynamic_creds(u
);
5416 static bool ignore_leftover_process(const char *comm
) {
5417 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5420 int unit_log_leftover_process_start(pid_t pid
, int sig
, void *userdata
) {
5421 _cleanup_free_
char *comm
= NULL
;
5423 (void) get_process_comm(pid
, &comm
);
5425 if (ignore_leftover_process(comm
))
5428 /* During start we print a warning */
5430 log_unit_warning(userdata
,
5431 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5432 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5438 int unit_log_leftover_process_stop(pid_t pid
, int sig
, void *userdata
) {
5439 _cleanup_free_
char *comm
= NULL
;
5441 (void) get_process_comm(pid
, &comm
);
5443 if (ignore_leftover_process(comm
))
5446 /* During stop we only print an informational message */
5448 log_unit_info(userdata
,
5449 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
5455 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
5458 (void) unit_pick_cgroup_path(u
);
5460 if (!u
->cgroup_path
)
5463 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_func
, u
);
5466 bool unit_needs_console(Unit
*u
) {
5468 UnitActiveState state
;
5472 state
= unit_active_state(u
);
5474 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5477 if (UNIT_VTABLE(u
)->needs_console
)
5478 return UNIT_VTABLE(u
)->needs_console(u
);
5480 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5481 ec
= unit_get_exec_context(u
);
5485 return exec_context_may_touch_console(ec
);
5488 const char *unit_label_path(const Unit
*u
) {
5493 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
5494 * when validating access checks. */
5496 p
= u
->source_path
?: u
->fragment_path
;
5500 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
5501 if (null_or_empty_path(p
) > 0)
5507 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5512 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5513 * and not a kernel thread either */
5515 /* First, a simple range check */
5516 if (!pid_is_valid(pid
))
5517 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5519 /* Some extra safety check */
5520 if (pid
== 1 || pid
== getpid_cached())
5521 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5523 /* Don't even begin to bother with kernel threads */
5524 r
= is_kernel_thread(pid
);
5526 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5528 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5530 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5535 void unit_log_success(Unit
*u
) {
5538 /* Let's show message "Deactivated successfully" in debug mode (when manager is user) rather than in info mode.
5539 * This message has low information value for regular users and it might be a bit overwhelming on a system with
5540 * a lot of devices. */
5542 MANAGER_IS_USER(u
->manager
) ? LOG_DEBUG
: LOG_INFO
,
5543 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5544 LOG_UNIT_INVOCATION_ID(u
),
5545 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
5548 void unit_log_failure(Unit
*u
, const char *result
) {
5552 log_unit_struct(u
, LOG_WARNING
,
5553 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5554 LOG_UNIT_INVOCATION_ID(u
),
5555 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5556 "UNIT_RESULT=%s", result
);
5559 void unit_log_skip(Unit
*u
, const char *result
) {
5563 log_unit_struct(u
, LOG_INFO
,
5564 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5565 LOG_UNIT_INVOCATION_ID(u
),
5566 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5567 "UNIT_RESULT=%s", result
);
5570 void unit_log_process_exit(
5573 const char *command
,
5583 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5584 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5585 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5589 else if (code
== CLD_EXITED
)
5592 level
= LOG_WARNING
;
5594 log_unit_struct(u
, level
,
5595 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5596 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s",
5598 sigchld_code_to_string(code
), status
,
5599 strna(code
== CLD_EXITED
5600 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5601 : signal_to_string(status
))),
5602 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5603 "EXIT_STATUS=%i", status
,
5604 "COMMAND=%s", strna(command
),
5605 LOG_UNIT_INVOCATION_ID(u
));
5608 int unit_exit_status(Unit
*u
) {
5611 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5612 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5613 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5614 * service process has exited abnormally (signal/coredump). */
5616 if (!UNIT_VTABLE(u
)->exit_status
)
5619 return UNIT_VTABLE(u
)->exit_status(u
);
5622 int unit_failure_action_exit_status(Unit
*u
) {
5627 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5629 if (u
->failure_action_exit_status
>= 0)
5630 return u
->failure_action_exit_status
;
5632 r
= unit_exit_status(u
);
5633 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5639 int unit_success_action_exit_status(Unit
*u
) {
5644 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5646 if (u
->success_action_exit_status
>= 0)
5647 return u
->success_action_exit_status
;
5649 r
= unit_exit_status(u
);
5650 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5656 int unit_test_trigger_loaded(Unit
*u
) {
5659 /* Tests whether the unit to trigger is loaded */
5661 trigger
= UNIT_TRIGGER(u
);
5663 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5664 "Refusing to start, no unit to trigger.");
5665 if (trigger
->load_state
!= UNIT_LOADED
)
5666 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5667 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
5672 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
5676 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
||
5677 (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
&& !unit_will_restart(u
)))
5678 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
5680 exec_context_destroy_credentials(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], u
->id
);
5683 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
5684 UnitActiveState state
;
5688 /* Special return values:
5690 * -EOPNOTSUPP → cleaning not supported for this unit type
5691 * -EUNATCH → cleaning not defined for this resource type
5692 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
5693 * a job queued or similar
5696 if (!UNIT_VTABLE(u
)->clean
)
5702 if (u
->load_state
!= UNIT_LOADED
)
5708 state
= unit_active_state(u
);
5709 if (!IN_SET(state
, UNIT_INACTIVE
))
5712 return UNIT_VTABLE(u
)->clean(u
, mask
);
5715 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
5718 if (!UNIT_VTABLE(u
)->clean
||
5719 u
->load_state
!= UNIT_LOADED
) {
5724 /* When the clean() method is set, can_clean() really should be set too */
5725 assert(UNIT_VTABLE(u
)->can_clean
);
5727 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
5730 bool unit_can_freeze(Unit
*u
) {
5733 if (UNIT_VTABLE(u
)->can_freeze
)
5734 return UNIT_VTABLE(u
)->can_freeze(u
);
5736 return UNIT_VTABLE(u
)->freeze
;
5739 void unit_frozen(Unit
*u
) {
5742 u
->freezer_state
= FREEZER_FROZEN
;
5744 bus_unit_send_pending_freezer_message(u
);
5747 void unit_thawed(Unit
*u
) {
5750 u
->freezer_state
= FREEZER_RUNNING
;
5752 bus_unit_send_pending_freezer_message(u
);
5755 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
5757 int (*method
)(Unit
*);
5761 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
5763 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
5764 if (!method
|| !cg_freezer_supported())
5770 if (u
->load_state
!= UNIT_LOADED
)
5773 s
= unit_active_state(u
);
5774 if (s
!= UNIT_ACTIVE
)
5777 if (IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
))
5787 int unit_freeze(Unit
*u
) {
5788 return unit_freezer_action(u
, FREEZER_FREEZE
);
5791 int unit_thaw(Unit
*u
) {
5792 return unit_freezer_action(u
, FREEZER_THAW
);
5795 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
5796 int unit_freeze_vtable_common(Unit
*u
) {
5797 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
5800 int unit_thaw_vtable_common(Unit
*u
) {
5801 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
5804 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5805 [COLLECT_INACTIVE
] = "inactive",
5806 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5809 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);
5811 Unit
* unit_has_dependency(const Unit
*u
, UnitDependencyAtom atom
, Unit
*other
) {
5816 /* Checks if the unit has a dependency on 'other' with the specified dependency atom. If 'other' is
5817 * NULL checks if the unit has *any* dependency of that atom. Returns 'other' if found (or if 'other'
5818 * is NULL the first entry found), or NULL if not found. */
5820 UNIT_FOREACH_DEPENDENCY(i
, u
, atom
)
5821 if (!other
|| other
== i
)
5827 int unit_get_dependency_array(const Unit
*u
, UnitDependencyAtom atom
, Unit
***ret_array
) {
5828 _cleanup_free_ Unit
**array
= NULL
;
5835 /* Gets a list of units matching a specific atom as array. This is useful when iterating through
5836 * dependencies while modifying them: the array is an "atomic snapshot" of sorts, that can be read
5837 * while the dependency table is continuously updated. */
5839 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
5840 if (!GREEDY_REALLOC(array
, n
+ 1))
5846 *ret_array
= TAKE_PTR(array
);
5848 assert(n
<= INT_MAX
);