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 **ret_combined_buffer
) {
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 the 'ret_combined_buffer'
1352 * Note that *ret_combined_buffer may be set to NULL. */
1354 if (!u
->description
||
1355 u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
||
1356 (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& !ret_combined_buffer
) ||
1357 streq(u
->description
, u
->id
)) {
1359 if (ret_combined_buffer
)
1360 *ret_combined_buffer
= NULL
;
1364 if (ret_combined_buffer
) {
1365 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
) {
1366 *ret_combined_buffer
= strjoin(u
->id
, " - ", u
->description
);
1367 if (*ret_combined_buffer
)
1368 return *ret_combined_buffer
;
1369 log_oom(); /* Fall back to ->description */
1371 *ret_combined_buffer
= NULL
;
1374 return u
->description
;
1377 /* Common implementation for multiple backends */
1378 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1383 /* Load a .{service,socket,...} file */
1384 r
= unit_load_fragment(u
);
1388 if (u
->load_state
== UNIT_STUB
) {
1389 if (fragment_required
)
1392 u
->load_state
= UNIT_LOADED
;
1395 /* Load drop-in directory data. If u is an alias, we might be reloading the
1396 * target unit needlessly. But we cannot be sure which drops-ins have already
1397 * been loaded and which not, at least without doing complicated book-keeping,
1398 * so let's always reread all drop-ins. */
1399 r
= unit_load_dropin(unit_follow_merge(u
));
1403 if (u
->source_path
) {
1406 if (stat(u
->source_path
, &st
) >= 0)
1407 u
->source_mtime
= timespec_load(&st
.st_mtim
);
1409 u
->source_mtime
= 0;
1415 void unit_add_to_target_deps_queue(Unit
*u
) {
1416 Manager
*m
= u
->manager
;
1420 if (u
->in_target_deps_queue
)
1423 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1424 u
->in_target_deps_queue
= true;
1427 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1431 if (target
->type
!= UNIT_TARGET
)
1434 /* Only add the dependency if both units are loaded, so that
1435 * that loop check below is reliable */
1436 if (u
->load_state
!= UNIT_LOADED
||
1437 target
->load_state
!= UNIT_LOADED
)
1440 /* If either side wants no automatic dependencies, then let's
1442 if (!u
->default_dependencies
||
1443 !target
->default_dependencies
)
1446 /* Don't create loops */
1447 if (unit_has_dependency(target
, UNIT_ATOM_BEFORE
, u
))
1450 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1453 static int unit_add_slice_dependencies(Unit
*u
) {
1457 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1460 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1461 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1463 UnitDependencyMask mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1465 slice
= UNIT_GET_SLICE(u
);
1467 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, slice
, true, mask
);
1469 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1472 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1475 static int unit_add_mount_dependencies(Unit
*u
) {
1476 UnitDependencyInfo di
;
1482 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
) {
1483 char prefix
[strlen(path
) + 1];
1485 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1486 _cleanup_free_
char *p
= NULL
;
1489 r
= unit_name_from_path(prefix
, ".mount", &p
);
1490 if (IN_SET(r
, -EINVAL
, -ENAMETOOLONG
))
1491 continue; /* If the path cannot be converted to a mount unit name, then it's
1492 * not manageable as a unit by systemd, and hence we don't need a
1493 * dependency on it. Let's thus silently ignore the issue. */
1497 m
= manager_get_unit(u
->manager
, p
);
1499 /* Make sure to load the mount unit if it exists. If so the dependencies on
1500 * this unit will be added later during the loading of the mount unit. */
1501 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1507 if (m
->load_state
!= UNIT_LOADED
)
1510 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1514 if (m
->fragment_path
) {
1515 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1525 static int unit_add_oomd_dependencies(Unit
*u
) {
1532 if (!u
->default_dependencies
)
1535 c
= unit_get_cgroup_context(u
);
1539 wants_oomd
= (c
->moom_swap
== MANAGED_OOM_KILL
|| c
->moom_mem_pressure
== MANAGED_OOM_KILL
);
1543 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "systemd-oomd.service", true, UNIT_DEPENDENCY_FILE
);
1550 static int unit_add_startup_units(Unit
*u
) {
1553 c
= unit_get_cgroup_context(u
);
1557 if (c
->startup_cpu_shares
== CGROUP_CPU_SHARES_INVALID
&&
1558 c
->startup_io_weight
== CGROUP_WEIGHT_INVALID
&&
1559 c
->startup_blockio_weight
== CGROUP_BLKIO_WEIGHT_INVALID
)
1562 return set_ensure_put(&u
->manager
->startup_units
, NULL
, u
);
1565 static int unit_validate_on_failure_job_mode(
1567 const char *job_mode_setting
,
1569 const char *dependency_name
,
1570 UnitDependencyAtom atom
) {
1572 Unit
*other
, *found
= NULL
;
1574 if (job_mode
!= JOB_ISOLATE
)
1577 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
1580 else if (found
!= other
)
1581 return log_unit_error_errno(
1582 u
, SYNTHETIC_ERRNO(ENOEXEC
),
1583 "More than one %s dependencies specified but %sisolate set. Refusing.",
1584 dependency_name
, job_mode_setting
);
1590 int unit_load(Unit
*u
) {
1595 if (u
->in_load_queue
) {
1596 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1597 u
->in_load_queue
= false;
1600 if (u
->type
== _UNIT_TYPE_INVALID
)
1603 if (u
->load_state
!= UNIT_STUB
)
1606 if (u
->transient_file
) {
1607 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1608 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1610 r
= fflush_and_check(u
->transient_file
);
1614 u
->transient_file
= safe_fclose(u
->transient_file
);
1615 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1618 r
= UNIT_VTABLE(u
)->load(u
);
1622 assert(u
->load_state
!= UNIT_STUB
);
1624 if (u
->load_state
== UNIT_LOADED
) {
1625 unit_add_to_target_deps_queue(u
);
1627 r
= unit_add_slice_dependencies(u
);
1631 r
= unit_add_mount_dependencies(u
);
1635 r
= unit_add_oomd_dependencies(u
);
1639 r
= unit_add_startup_units(u
);
1643 r
= unit_validate_on_failure_job_mode(u
, "OnSuccessJobMode=", u
->on_success_job_mode
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
);
1647 r
= unit_validate_on_failure_job_mode(u
, "OnFailureJobMode=", u
->on_failure_job_mode
, "OnFailure=", UNIT_ATOM_ON_FAILURE
);
1651 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1652 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1654 /* We finished loading, let's ensure our parents recalculate the members mask */
1655 unit_invalidate_cgroup_members_masks(u
);
1658 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1660 unit_add_to_dbus_queue(unit_follow_merge(u
));
1661 unit_add_to_gc_queue(u
);
1662 (void) manager_varlink_send_managed_oom_update(u
);
1667 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code
1668 * should hence return ENOEXEC to ensure units are placed in this state after loading. */
1670 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1671 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1675 /* Record the timestamp on the cache, so that if the cache gets updated between now and the next time
1676 * an attempt is made to load this unit, we know we need to check again. */
1677 if (u
->load_state
== UNIT_NOT_FOUND
)
1678 u
->fragment_not_found_timestamp_hash
= u
->manager
->unit_cache_timestamp_hash
;
1680 unit_add_to_dbus_queue(u
);
1681 unit_add_to_gc_queue(u
);
1683 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1687 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1692 if (u
&& !unit_log_level_test(u
, level
))
1693 return -ERRNO_VALUE(error
);
1695 va_start(ap
, format
);
1697 r
= log_object_internalv(level
, error
, file
, line
, func
,
1698 u
->manager
->unit_log_field
,
1700 u
->manager
->invocation_log_field
,
1701 u
->invocation_id_string
,
1704 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1710 static bool unit_test_condition(Unit
*u
) {
1711 _cleanup_strv_free_
char **env
= NULL
;
1716 dual_timestamp_get(&u
->condition_timestamp
);
1718 r
= manager_get_effective_environment(u
->manager
, &env
);
1720 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1721 u
->condition_result
= CONDITION_ERROR
;
1723 u
->condition_result
= condition_test_list(
1726 condition_type_to_string
,
1730 unit_add_to_dbus_queue(u
);
1731 return u
->condition_result
;
1734 static bool unit_test_assert(Unit
*u
) {
1735 _cleanup_strv_free_
char **env
= NULL
;
1740 dual_timestamp_get(&u
->assert_timestamp
);
1742 r
= manager_get_effective_environment(u
->manager
, &env
);
1744 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1745 u
->assert_result
= CONDITION_ERROR
;
1747 u
->assert_result
= condition_test_list(
1750 assert_type_to_string
,
1754 unit_add_to_dbus_queue(u
);
1755 return u
->assert_result
;
1758 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *format
, const char *ident
) {
1759 if (log_get_show_color()) {
1760 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& strchr(ident
, ' '))
1761 ident
= strjoina(ANSI_HIGHLIGHT
, u
->id
, ANSI_NORMAL
, " - ", u
->description
);
1763 ident
= strjoina(ANSI_HIGHLIGHT
, ident
, ANSI_NORMAL
);
1766 DISABLE_WARNING_FORMAT_NONLITERAL
;
1767 manager_status_printf(u
->manager
, status_type
, status
, format
, ident
);
1771 int unit_test_start_limit(Unit
*u
) {
1776 if (ratelimit_below(&u
->start_ratelimit
)) {
1777 u
->start_limit_hit
= false;
1781 log_unit_warning(u
, "Start request repeated too quickly.");
1782 u
->start_limit_hit
= true;
1784 reason
= strjoina("unit ", u
->id
, " failed");
1786 emergency_action(u
->manager
, u
->start_limit_action
,
1787 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1788 u
->reboot_arg
, -1, reason
);
1793 bool unit_shall_confirm_spawn(Unit
*u
) {
1796 if (manager_is_confirm_spawn_disabled(u
->manager
))
1799 /* For some reasons units remaining in the same process group
1800 * as PID 1 fail to acquire the console even if it's not used
1801 * by any process. So skip the confirmation question for them. */
1802 return !unit_get_exec_context(u
)->same_pgrp
;
1805 static bool unit_verify_deps(Unit
*u
) {
1810 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined
1811 * with After=. We do not check Requires= or Requisite= here as they only should have an effect on
1812 * the job processing, but do not have any effect afterwards. We don't check BindsTo= dependencies
1813 * that are not used in conjunction with After= as for them any such check would make things entirely
1816 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
1818 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
))
1821 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1822 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1830 /* Errors that aren't really errors:
1831 * -EALREADY: Unit is already started.
1832 * -ECOMM: Condition failed
1833 * -EAGAIN: An operation is already in progress. Retry later.
1835 * Errors that are real errors:
1836 * -EBADR: This unit type does not support starting.
1837 * -ECANCELED: Start limit hit, too many requests for now
1838 * -EPROTO: Assert failed
1839 * -EINVAL: Unit not loaded
1840 * -EOPNOTSUPP: Unit type not supported
1841 * -ENOLINK: The necessary dependencies are not fulfilled.
1842 * -ESTALE: This unit has been started before and can't be started a second time
1843 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1845 int unit_start(Unit
*u
) {
1846 UnitActiveState state
;
1851 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1852 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1853 * waiting is finished. */
1854 state
= unit_active_state(u
);
1855 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1857 if (state
== UNIT_MAINTENANCE
)
1860 /* Units that aren't loaded cannot be started */
1861 if (u
->load_state
!= UNIT_LOADED
)
1864 /* Refuse starting scope units more than once */
1865 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1868 /* If the conditions failed, don't do anything at all. If we already are activating this call might
1869 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1870 * recheck the condition in that case. */
1871 if (state
!= UNIT_ACTIVATING
&&
1872 !unit_test_condition(u
))
1873 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition failed. Not starting unit.");
1875 /* If the asserts failed, fail the entire job */
1876 if (state
!= UNIT_ACTIVATING
&&
1877 !unit_test_assert(u
))
1878 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1880 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1881 * condition checks, so that we rather return condition check errors (which are usually not
1882 * considered a true failure) than "not supported" errors (which are considered a failure).
1884 if (!unit_type_supported(u
->type
))
1887 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1888 * should have taken care of this already, but let's check this here again. After all, our
1889 * dependencies might not be in effect anymore, due to a reload or due to a failed condition. */
1890 if (!unit_verify_deps(u
))
1893 /* Forward to the main object, if we aren't it. */
1894 following
= unit_following(u
);
1896 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1897 return unit_start(following
);
1900 /* If it is stopped, but we cannot start it, then fail */
1901 if (!UNIT_VTABLE(u
)->start
)
1904 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1905 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1906 * waits for a holdoff timer to elapse before it will start again. */
1908 unit_add_to_dbus_queue(u
);
1909 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1911 return UNIT_VTABLE(u
)->start(u
);
1914 bool unit_can_start(Unit
*u
) {
1917 if (u
->load_state
!= UNIT_LOADED
)
1920 if (!unit_type_supported(u
->type
))
1923 /* Scope units may be started only once */
1924 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
1927 return !!UNIT_VTABLE(u
)->start
;
1930 bool unit_can_isolate(Unit
*u
) {
1933 return unit_can_start(u
) &&
1938 * -EBADR: This unit type does not support stopping.
1939 * -EALREADY: Unit is already stopped.
1940 * -EAGAIN: An operation is already in progress. Retry later.
1942 int unit_stop(Unit
*u
) {
1943 UnitActiveState state
;
1948 state
= unit_active_state(u
);
1949 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1952 following
= unit_following(u
);
1954 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1955 return unit_stop(following
);
1958 if (!UNIT_VTABLE(u
)->stop
)
1961 unit_add_to_dbus_queue(u
);
1962 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1964 return UNIT_VTABLE(u
)->stop(u
);
1967 bool unit_can_stop(Unit
*u
) {
1970 /* Note: if we return true here, it does not mean that the unit may be successfully stopped.
1971 * Extrinsic units follow external state and they may stop following external state changes
1972 * (hence we return true here), but an attempt to do this through the manager will fail. */
1974 if (!unit_type_supported(u
->type
))
1980 return !!UNIT_VTABLE(u
)->stop
;
1984 * -EBADR: This unit type does not support reloading.
1985 * -ENOEXEC: Unit is not started.
1986 * -EAGAIN: An operation is already in progress. Retry later.
1988 int unit_reload(Unit
*u
) {
1989 UnitActiveState state
;
1994 if (u
->load_state
!= UNIT_LOADED
)
1997 if (!unit_can_reload(u
))
2000 state
= unit_active_state(u
);
2001 if (state
== UNIT_RELOADING
)
2004 if (state
!= UNIT_ACTIVE
)
2005 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
), "Unit cannot be reloaded because it is inactive.");
2007 following
= unit_following(u
);
2009 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
2010 return unit_reload(following
);
2013 unit_add_to_dbus_queue(u
);
2015 if (!UNIT_VTABLE(u
)->reload
) {
2016 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
2017 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), 0);
2021 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2023 return UNIT_VTABLE(u
)->reload(u
);
2026 bool unit_can_reload(Unit
*u
) {
2029 if (UNIT_VTABLE(u
)->can_reload
)
2030 return UNIT_VTABLE(u
)->can_reload(u
);
2032 if (unit_has_dependency(u
, UNIT_ATOM_PROPAGATES_RELOAD_TO
, NULL
))
2035 return UNIT_VTABLE(u
)->reload
;
2038 bool unit_is_unneeded(Unit
*u
) {
2042 if (!u
->stop_when_unneeded
)
2045 /* Don't clean up while the unit is transitioning or is even inactive. */
2046 if (unit_active_state(u
) != UNIT_ACTIVE
)
2051 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_PINS_STOP_WHEN_UNNEEDED
) {
2052 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
2053 * restart, then don't clean this one up. */
2058 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2061 if (unit_will_restart(other
))
2068 bool unit_is_upheld_by_active(Unit
*u
, Unit
**ret_culprit
) {
2073 /* Checks if the unit needs to be started because it currently is not running, but some other unit
2074 * that is active declared an Uphold= dependencies on it */
2076 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)) || u
->job
) {
2078 *ret_culprit
= NULL
;
2082 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_START_STEADILY
) {
2086 if (UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
2088 *ret_culprit
= other
;
2094 *ret_culprit
= NULL
;
2098 bool unit_is_bound_by_inactive(Unit
*u
, Unit
**ret_culprit
) {
2103 /* Checks whether this unit is bound to another unit that is inactive, i.e. whether we should stop
2104 * because the other unit is down. */
2106 if (unit_active_state(u
) != UNIT_ACTIVE
|| u
->job
) {
2107 /* Don't clean up while the unit is transitioning or is even inactive. */
2109 *ret_culprit
= NULL
;
2113 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
2117 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
))) {
2119 *ret_culprit
= other
;
2126 *ret_culprit
= NULL
;
2130 static void check_unneeded_dependencies(Unit
*u
) {
2134 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2136 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_STOP_WHEN_UNNEEDED_QUEUE
)
2137 unit_submit_to_stop_when_unneeded_queue(other
);
2140 static void check_uphold_dependencies(Unit
*u
) {
2144 /* Add all units this unit depends on to the queue that processes Uphold= behaviour. */
2146 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_START_WHEN_UPHELD_QUEUE
)
2147 unit_submit_to_start_when_upheld_queue(other
);
2150 static void check_bound_by_dependencies(Unit
*u
) {
2154 /* Add all units this unit depends on to the queue that processes BindsTo= stop behaviour. */
2156 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_CANNOT_BE_ACTIVE_WITHOUT_QUEUE
)
2157 unit_submit_to_stop_when_bound_queue(other
);
2160 static void retroactively_start_dependencies(Unit
*u
) {
2164 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2166 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_REPLACE
) /* Requires= + BindsTo= */
2167 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2168 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2169 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2171 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_FAIL
) /* Wants= */
2172 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2173 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2174 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2176 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_START
) /* Conflicts= (and inverse) */
2177 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2178 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2181 static void retroactively_stop_dependencies(Unit
*u
) {
2185 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2187 /* Pull down units which are bound to us recursively if enabled */
2188 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_STOP
) /* BoundBy= */
2189 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2190 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2193 void unit_start_on_failure(
2195 const char *dependency_name
,
2196 UnitDependencyAtom atom
,
2199 bool logged
= false;
2204 assert(dependency_name
);
2205 assert(IN_SET(atom
, UNIT_ATOM_ON_SUCCESS
, UNIT_ATOM_ON_FAILURE
));
2207 /* Act on OnFailure= and OnSuccess= dependencies */
2209 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
2210 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2213 log_unit_info(u
, "Triggering %s dependencies.", dependency_name
);
2217 r
= manager_add_job(u
->manager
, JOB_START
, other
, job_mode
, NULL
, &error
, NULL
);
2219 log_unit_warning_errno(
2220 u
, r
, "Failed to enqueue %s job, ignoring: %s",
2221 dependency_name
, bus_error_message(&error
, r
));
2225 log_unit_debug(u
, "Triggering %s dependencies done.", dependency_name
);
2228 void unit_trigger_notify(Unit
*u
) {
2233 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_TRIGGERED_BY
)
2234 if (UNIT_VTABLE(other
)->trigger_notify
)
2235 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2238 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2239 if (condition_notice
&& log_level
> LOG_NOTICE
)
2241 if (condition_info
&& log_level
> LOG_INFO
)
2246 static int unit_log_resources(Unit
*u
) {
2247 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4];
2248 bool any_traffic
= false, have_ip_accounting
= false, any_io
= false, have_io_accounting
= false;
2249 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
, *rr
= NULL
, *wr
= NULL
;
2250 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a threshold */
2251 size_t n_message_parts
= 0, n_iovec
= 0;
2252 char* message_parts
[1 + 2 + 2 + 1], *t
;
2253 nsec_t nsec
= NSEC_INFINITY
;
2255 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2256 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2257 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2258 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2259 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2261 const char* const io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2262 [CGROUP_IO_READ_BYTES
] = "IO_METRIC_READ_BYTES",
2263 [CGROUP_IO_WRITE_BYTES
] = "IO_METRIC_WRITE_BYTES",
2264 [CGROUP_IO_READ_OPERATIONS
] = "IO_METRIC_READ_OPERATIONS",
2265 [CGROUP_IO_WRITE_OPERATIONS
] = "IO_METRIC_WRITE_OPERATIONS",
2270 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2271 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2272 * information and the complete data in structured fields. */
2274 (void) unit_get_cpu_usage(u
, &nsec
);
2275 if (nsec
!= NSEC_INFINITY
) {
2276 /* Format the CPU time for inclusion in the structured log message */
2277 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2281 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2283 /* Format the CPU time for inclusion in the human language message string */
2284 t
= strjoin("consumed ", FORMAT_TIMESPAN(nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
), " CPU time");
2290 message_parts
[n_message_parts
++] = t
;
2292 log_level
= raise_level(log_level
,
2293 nsec
> NOTICEWORTHY_CPU_NSEC
,
2294 nsec
> MENTIONWORTHY_CPU_NSEC
);
2297 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2298 char buf
[FORMAT_BYTES_MAX
] = "";
2299 uint64_t value
= UINT64_MAX
;
2301 assert(io_fields
[k
]);
2303 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2304 if (value
== UINT64_MAX
)
2307 have_io_accounting
= true;
2311 /* Format IO accounting data for inclusion in the structured log message */
2312 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2316 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2318 /* Format the IO accounting data for inclusion in the human language message string, but only
2319 * for the bytes counters (and not for the operations counters) */
2320 if (k
== CGROUP_IO_READ_BYTES
) {
2322 rr
= strjoin("read ", format_bytes(buf
, sizeof(buf
), value
), " from disk");
2327 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2329 wr
= strjoin("written ", format_bytes(buf
, sizeof(buf
), value
), " to disk");
2336 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2337 log_level
= raise_level(log_level
,
2338 value
> MENTIONWORTHY_IO_BYTES
,
2339 value
> NOTICEWORTHY_IO_BYTES
);
2342 if (have_io_accounting
) {
2345 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2347 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2352 k
= strdup("no IO");
2358 message_parts
[n_message_parts
++] = k
;
2362 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2363 char buf
[FORMAT_BYTES_MAX
] = "";
2364 uint64_t value
= UINT64_MAX
;
2366 assert(ip_fields
[m
]);
2368 (void) unit_get_ip_accounting(u
, m
, &value
);
2369 if (value
== UINT64_MAX
)
2372 have_ip_accounting
= true;
2376 /* Format IP accounting data for inclusion in the structured log message */
2377 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2381 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2383 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2384 * bytes counters (and not for the packets counters) */
2385 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2387 igress
= strjoin("received ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2392 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2394 egress
= strjoin("sent ", format_bytes(buf
, sizeof(buf
), value
), " IP traffic");
2401 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2402 log_level
= raise_level(log_level
,
2403 value
> MENTIONWORTHY_IP_BYTES
,
2404 value
> NOTICEWORTHY_IP_BYTES
);
2407 /* This check is here because it is the earliest point following all possible log_level assignments. If
2408 * log_level is assigned anywhere after this point, move this check. */
2409 if (!unit_log_level_test(u
, log_level
)) {
2414 if (have_ip_accounting
) {
2417 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2419 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2424 k
= strdup("no IP traffic");
2430 message_parts
[n_message_parts
++] = k
;
2434 /* Is there any accounting data available at all? */
2440 if (n_message_parts
== 0)
2441 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2443 _cleanup_free_
char *joined
= NULL
;
2445 message_parts
[n_message_parts
] = NULL
;
2447 joined
= strv_join(message_parts
, ", ");
2453 joined
[0] = ascii_toupper(joined
[0]);
2454 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2457 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2458 * and hence don't increase n_iovec for them */
2459 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2460 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2462 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2463 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2465 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2466 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2468 log_unit_struct_iovec(u
, log_level
, iovec
, n_iovec
+ 4);
2472 for (size_t i
= 0; i
< n_message_parts
; i
++)
2473 free(message_parts
[i
]);
2475 for (size_t i
= 0; i
< n_iovec
; i
++)
2476 free(iovec
[i
].iov_base
);
2482 static void unit_update_on_console(Unit
*u
) {
2487 b
= unit_needs_console(u
);
2488 if (u
->on_console
== b
)
2493 manager_ref_console(u
->manager
);
2495 manager_unref_console(u
->manager
);
2498 static void unit_emit_audit_start(Unit
*u
) {
2501 if (u
->type
!= UNIT_SERVICE
)
2504 /* Write audit record if we have just finished starting up */
2505 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2509 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2512 if (u
->type
!= UNIT_SERVICE
)
2516 /* Write audit record if we have just finished shutting down */
2517 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2518 u
->in_audit
= false;
2520 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2521 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2523 if (state
== UNIT_INACTIVE
)
2524 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2528 static bool unit_process_job(Job
*j
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2529 bool unexpected
= false;
2534 if (j
->state
== JOB_WAITING
)
2536 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2538 job_add_to_run_queue(j
);
2540 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2541 * hence needs to invalidate jobs. */
2546 case JOB_VERIFY_ACTIVE
:
2548 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2549 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2550 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2553 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2554 if (ns
== UNIT_FAILED
)
2555 result
= JOB_FAILED
;
2559 job_finish_and_invalidate(j
, result
, true, false);
2566 case JOB_RELOAD_OR_START
:
2567 case JOB_TRY_RELOAD
:
2569 if (j
->state
== JOB_RUNNING
) {
2570 if (ns
== UNIT_ACTIVE
)
2571 job_finish_and_invalidate(j
, (flags
& UNIT_NOTIFY_RELOAD_FAILURE
) ? JOB_FAILED
: JOB_DONE
, true, false);
2572 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2575 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2576 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2584 case JOB_TRY_RESTART
:
2586 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2587 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2588 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2590 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2596 assert_not_reached("Job type unknown");
2602 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2607 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2608 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2610 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2611 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2612 * remounted this function will be called too! */
2616 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2617 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2618 unit_add_to_dbus_queue(u
);
2620 /* Update systemd-oomd on the property/state change */
2622 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2624 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2625 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2626 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2627 * have the information on the property. Thus, indiscriminately send an update. */
2628 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2629 (void) manager_varlink_send_managed_oom_update(u
);
2632 /* Update timestamps for state changes */
2633 if (!MANAGER_IS_RELOADING(m
)) {
2634 dual_timestamp_get(&u
->state_change_timestamp
);
2636 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2637 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2638 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2639 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2641 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2642 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2643 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2644 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2647 /* Keep track of failed units */
2648 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2650 /* Make sure the cgroup and state files are always removed when we become inactive */
2651 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2652 SET_FLAG(u
->markers
,
2653 (1u << UNIT_MARKER_NEEDS_RELOAD
)|(1u << UNIT_MARKER_NEEDS_RESTART
),
2655 unit_prune_cgroup(u
);
2656 unit_unlink_state_files(u
);
2657 } else if (ns
!= os
&& ns
== UNIT_RELOADING
)
2658 SET_FLAG(u
->markers
, 1u << UNIT_MARKER_NEEDS_RELOAD
, false);
2660 unit_update_on_console(u
);
2662 if (!MANAGER_IS_RELOADING(m
)) {
2665 /* Let's propagate state changes to the job */
2667 unexpected
= unit_process_job(u
->job
, ns
, flags
);
2671 /* If this state change happened without being requested by a job, then let's retroactively start or
2672 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2673 * additional jobs just because something is already activated. */
2676 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2677 retroactively_start_dependencies(u
);
2678 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2679 retroactively_stop_dependencies(u
);
2682 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2683 log_unit_debug(u
, "Unit entered failed state.");
2685 if (!(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2686 unit_start_on_failure(u
, "OnFailure=", UNIT_ATOM_ON_FAILURE
, u
->on_failure_job_mode
);
2689 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2690 /* This unit just finished starting up */
2692 unit_emit_audit_start(u
);
2693 manager_send_unit_plymouth(m
, u
);
2696 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2697 /* This unit just stopped/failed. */
2699 unit_emit_audit_stop(u
, ns
);
2700 unit_log_resources(u
);
2703 if (ns
== UNIT_INACTIVE
&& !IN_SET(os
, UNIT_FAILED
, UNIT_INACTIVE
, UNIT_MAINTENANCE
) &&
2704 !(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2705 unit_start_on_failure(u
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
, u
->on_success_job_mode
);
2708 manager_recheck_journal(m
);
2709 manager_recheck_dbus(m
);
2711 unit_trigger_notify(u
);
2713 if (!MANAGER_IS_RELOADING(m
)) {
2714 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2715 reason
= strjoina("unit ", u
->id
, " failed");
2716 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2717 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2718 reason
= strjoina("unit ", u
->id
, " succeeded");
2719 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2723 /* And now, add the unit or depending units to various queues that will act on the new situation if
2724 * needed. These queues generally check for continuous state changes rather than events (like most of
2725 * the state propagation above), and do work deferred instead of instantly, since they typically
2726 * don't want to run during reloading, and usually involve checking combined state of multiple units
2729 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2730 /* Stop unneeded units and bound-by units regardless if going down was expected or not */
2731 check_unneeded_dependencies(u
);
2732 check_bound_by_dependencies(u
);
2734 /* Maybe someone wants us to remain up? */
2735 unit_submit_to_start_when_upheld_queue(u
);
2737 /* Maybe the unit should be GC'ed now? */
2738 unit_add_to_gc_queue(u
);
2741 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2742 /* Start uphold units regardless if going up was expected or not */
2743 check_uphold_dependencies(u
);
2745 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2746 unit_submit_to_stop_when_unneeded_queue(u
);
2748 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens
2749 * when something BindsTo= to a Type=oneshot unit, as these units go directly from starting to
2750 * inactive, without ever entering started.) */
2751 unit_submit_to_stop_when_bound_queue(u
);
2755 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2759 assert(pid_is_valid(pid
));
2761 /* Watch a specific PID */
2763 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2764 * opportunity to remove any stalled references to this PID as they can be created
2765 * easily (when watching a process which is not our direct child). */
2767 manager_unwatch_pid(u
->manager
, pid
);
2769 r
= set_ensure_allocated(&u
->pids
, NULL
);
2773 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2777 /* First try, let's add the unit keyed by "pid". */
2778 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2784 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2785 * to an array of Units rather than just a Unit), lists us already. */
2787 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2789 for (; array
[n
]; n
++)
2793 if (found
) /* Found it already? if so, do nothing */
2798 /* Allocate a new array */
2799 new_array
= new(Unit
*, n
+ 2);
2803 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2805 new_array
[n
+1] = NULL
;
2807 /* Add or replace the old array */
2808 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2819 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2826 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2830 assert(pid_is_valid(pid
));
2832 /* First let's drop the unit in case it's keyed as "pid". */
2833 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2835 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2836 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2838 /* Let's iterate through the array, dropping our own entry */
2841 for (size_t n
= 0; array
[n
]; n
++)
2843 array
[m
++] = array
[n
];
2847 /* The array is now empty, remove the entire entry */
2848 assert_se(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2853 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2856 void unit_unwatch_all_pids(Unit
*u
) {
2859 while (!set_isempty(u
->pids
))
2860 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2862 u
->pids
= set_free(u
->pids
);
2865 static void unit_tidy_watch_pids(Unit
*u
) {
2866 pid_t except1
, except2
;
2871 /* Cleans dead PIDs from our list */
2873 except1
= unit_main_pid(u
);
2874 except2
= unit_control_pid(u
);
2876 SET_FOREACH(e
, u
->pids
) {
2877 pid_t pid
= PTR_TO_PID(e
);
2879 if (pid
== except1
|| pid
== except2
)
2882 if (!pid_is_unwaited(pid
))
2883 unit_unwatch_pid(u
, pid
);
2887 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2893 unit_tidy_watch_pids(u
);
2894 unit_watch_all_pids(u
);
2896 /* If the PID set is empty now, then let's finish this off. */
2897 unit_synthesize_cgroup_empty_event(u
);
2902 int unit_enqueue_rewatch_pids(Unit
*u
) {
2907 if (!u
->cgroup_path
)
2910 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2913 if (r
> 0) /* On unified we can use proper notifications */
2916 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2917 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2918 * involves issuing kill(pid, 0) on all processes we watch. */
2920 if (!u
->rewatch_pids_event_source
) {
2921 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2923 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2925 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2927 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2929 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
2931 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2933 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2936 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2938 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2943 void unit_dequeue_rewatch_pids(Unit
*u
) {
2947 if (!u
->rewatch_pids_event_source
)
2950 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
2952 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
2954 u
->rewatch_pids_event_source
= sd_event_source_disable_unref(u
->rewatch_pids_event_source
);
2957 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2959 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2963 case JOB_VERIFY_ACTIVE
:
2966 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2967 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
2972 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2973 * external events), hence it makes no sense to permit enqueuing such a request either. */
2974 return !u
->perpetual
;
2977 case JOB_TRY_RESTART
:
2978 return unit_can_stop(u
) && unit_can_start(u
);
2981 case JOB_TRY_RELOAD
:
2982 return unit_can_reload(u
);
2984 case JOB_RELOAD_OR_START
:
2985 return unit_can_reload(u
) && unit_can_start(u
);
2988 assert_not_reached("Invalid job type");
2992 int unit_add_dependency(
2997 UnitDependencyMask mask
) {
2999 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
3000 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
3001 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
3002 [UNIT_WANTS
] = UNIT_WANTED_BY
,
3003 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
3004 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
3005 [UNIT_UPHOLDS
] = UNIT_UPHELD_BY
,
3006 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
3007 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
3008 [UNIT_WANTED_BY
] = UNIT_WANTS
,
3009 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
3010 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
3011 [UNIT_UPHELD_BY
] = UNIT_UPHOLDS
,
3012 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
3013 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
3014 [UNIT_BEFORE
] = UNIT_AFTER
,
3015 [UNIT_AFTER
] = UNIT_BEFORE
,
3016 [UNIT_ON_SUCCESS
] = UNIT_ON_SUCCESS_OF
,
3017 [UNIT_ON_SUCCESS_OF
] = UNIT_ON_SUCCESS
,
3018 [UNIT_ON_FAILURE
] = UNIT_ON_FAILURE_OF
,
3019 [UNIT_ON_FAILURE_OF
] = UNIT_ON_FAILURE
,
3020 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
3021 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
3022 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3023 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3024 [UNIT_PROPAGATES_STOP_TO
] = UNIT_STOP_PROPAGATED_FROM
,
3025 [UNIT_STOP_PROPAGATED_FROM
] = UNIT_PROPAGATES_STOP_TO
,
3026 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
, /* symmetric! 👓 */
3027 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3028 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3029 [UNIT_IN_SLICE
] = UNIT_SLICE_OF
,
3030 [UNIT_SLICE_OF
] = UNIT_IN_SLICE
,
3032 Unit
*original_u
= u
, *original_other
= other
;
3033 UnitDependencyAtom a
;
3036 /* Helper to know whether sending a notification is necessary or not: if the dependency is already
3037 * there, no need to notify! */
3041 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3044 u
= unit_follow_merge(u
);
3045 other
= unit_follow_merge(other
);
3046 a
= unit_dependency_to_atom(d
);
3049 /* We won't allow dependencies on ourselves. We will not consider them an error however. */
3051 unit_maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
3055 /* Note that ordering a device unit after a unit is permitted since it allows to start its job
3056 * running timeout at a specific time. */
3057 if (FLAGS_SET(a
, UNIT_ATOM_BEFORE
) && other
->type
== UNIT_DEVICE
) {
3058 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3062 if (FLAGS_SET(a
, UNIT_ATOM_ON_FAILURE
) && !UNIT_VTABLE(u
)->can_fail
) {
3063 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3067 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERS
) && !UNIT_VTABLE(u
)->can_trigger
)
3068 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3069 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3070 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERED_BY
) && !UNIT_VTABLE(other
)->can_trigger
)
3071 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3072 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3074 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && other
->type
!= UNIT_SLICE
)
3075 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3076 "Requested dependency Slice=%s refused (%s is not a slice unit).", other
->id
, other
->id
);
3077 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && u
->type
!= UNIT_SLICE
)
3078 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3079 "Requested dependency SliceOf=%s refused (%s is not a slice unit).", other
->id
, u
->id
);
3081 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && !UNIT_HAS_CGROUP_CONTEXT(u
))
3082 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3083 "Requested dependency Slice=%s refused (%s is not a cgroup unit).", other
->id
, u
->id
);
3085 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && !UNIT_HAS_CGROUP_CONTEXT(other
))
3086 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3087 "Requested dependency SliceOf=%s refused (%s is not a cgroup unit).", other
->id
, other
->id
);
3089 r
= unit_add_dependency_hashmap(&u
->dependencies
, d
, other
, mask
, 0);
3094 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
3095 r
= unit_add_dependency_hashmap(&other
->dependencies
, inverse_table
[d
], u
, 0, mask
);
3102 if (add_reference
) {
3103 r
= unit_add_dependency_hashmap(&u
->dependencies
, UNIT_REFERENCES
, other
, mask
, 0);
3109 r
= unit_add_dependency_hashmap(&other
->dependencies
, UNIT_REFERENCED_BY
, u
, 0, mask
);
3117 unit_add_to_dbus_queue(u
);
3122 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3127 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3131 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3134 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3142 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3149 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3151 _cleanup_free_
char *i
= NULL
;
3153 r
= unit_name_to_prefix(u
->id
, &i
);
3157 r
= unit_name_replace_instance(name
, i
, buf
);
3166 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3167 _cleanup_free_
char *buf
= NULL
;
3174 r
= resolve_template(u
, name
, &buf
, &name
);
3178 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3182 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3185 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3186 _cleanup_free_
char *buf
= NULL
;
3193 r
= resolve_template(u
, name
, &buf
, &name
);
3197 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3201 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3204 int set_unit_path(const char *p
) {
3205 /* This is mostly for debug purposes */
3206 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
3212 char *unit_dbus_path(Unit
*u
) {
3218 return unit_dbus_path_from_name(u
->id
);
3221 char *unit_dbus_path_invocation_id(Unit
*u
) {
3224 if (sd_id128_is_null(u
->invocation_id
))
3227 return unit_dbus_path_from_name(u
->invocation_id_string
);
3230 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3235 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3237 if (sd_id128_equal(u
->invocation_id
, id
))
3240 if (!sd_id128_is_null(u
->invocation_id
))
3241 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3243 if (sd_id128_is_null(id
)) {
3248 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3252 u
->invocation_id
= id
;
3253 sd_id128_to_string(id
, u
->invocation_id_string
);
3255 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3262 u
->invocation_id
= SD_ID128_NULL
;
3263 u
->invocation_id_string
[0] = 0;
3267 int unit_set_slice(Unit
*u
, Unit
*slice
, UnitDependencyMask mask
) {
3273 /* Sets the unit slice if it has not been set before. Is extra careful, to only allow this for units
3274 * that actually have a cgroup context. Also, we don't allow to set this for slices (since the parent
3275 * slice is derived from the name). Make sure the unit we set is actually a slice. */
3277 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3280 if (u
->type
== UNIT_SLICE
)
3283 if (unit_active_state(u
) != UNIT_INACTIVE
)
3286 if (slice
->type
!= UNIT_SLICE
)
3289 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3290 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3293 if (UNIT_GET_SLICE(u
) == slice
)
3296 /* Disallow slice changes if @u is already bound to cgroups */
3297 if (UNIT_GET_SLICE(u
) && u
->cgroup_realized
)
3300 r
= unit_add_dependency(u
, UNIT_IN_SLICE
, slice
, true, mask
);
3307 int unit_set_default_slice(Unit
*u
) {
3308 const char *slice_name
;
3314 if (UNIT_GET_SLICE(u
))
3318 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3320 /* Implicitly place all instantiated units in their
3321 * own per-template slice */
3323 r
= unit_name_to_prefix(u
->id
, &prefix
);
3327 /* The prefix is already escaped, but it might include
3328 * "-" which has a special meaning for slice units,
3329 * hence escape it here extra. */
3330 escaped
= unit_name_escape(prefix
);
3334 if (MANAGER_IS_SYSTEM(u
->manager
))
3335 slice_name
= strjoina("system-", escaped
, ".slice");
3337 slice_name
= strjoina("app-", escaped
, ".slice");
3339 } else if (unit_is_extrinsic(u
))
3340 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3341 * the root slice. They don't really belong in one of the subslices. */
3342 slice_name
= SPECIAL_ROOT_SLICE
;
3344 else if (MANAGER_IS_SYSTEM(u
->manager
))
3345 slice_name
= SPECIAL_SYSTEM_SLICE
;
3347 slice_name
= SPECIAL_APP_SLICE
;
3349 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3353 return unit_set_slice(u
, slice
, UNIT_DEPENDENCY_FILE
);
3356 const char *unit_slice_name(Unit
*u
) {
3360 slice
= UNIT_GET_SLICE(u
);
3367 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3368 _cleanup_free_
char *t
= NULL
;
3375 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3378 if (unit_has_name(u
, t
))
3381 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3382 assert(r
< 0 || *_found
!= u
);
3386 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3387 const char *new_owner
;
3394 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3396 bus_log_parse_error(r
);
3400 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3401 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3406 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3407 const sd_bus_error
*e
;
3408 const char *new_owner
;
3415 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3417 e
= sd_bus_message_get_error(message
);
3419 if (!sd_bus_error_has_name(e
, "org.freedesktop.DBus.Error.NameHasNoOwner"))
3420 log_unit_error(u
, "Unexpected error response from GetNameOwner(): %s", e
->message
);
3424 r
= sd_bus_message_read(message
, "s", &new_owner
);
3426 return bus_log_parse_error(r
);
3428 assert(!isempty(new_owner
));
3431 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3432 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3437 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3445 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3448 match
= strjoina("type='signal',"
3449 "sender='org.freedesktop.DBus',"
3450 "path='/org/freedesktop/DBus',"
3451 "interface='org.freedesktop.DBus',"
3452 "member='NameOwnerChanged',"
3453 "arg0='", name
, "'");
3455 r
= sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3459 r
= sd_bus_call_method_async(
3461 &u
->get_name_owner_slot
,
3462 "org.freedesktop.DBus",
3463 "/org/freedesktop/DBus",
3464 "org.freedesktop.DBus",
3466 get_name_owner_handler
,
3470 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3474 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3478 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3484 /* Watch a specific name on the bus. We only support one unit
3485 * watching each name for now. */
3487 if (u
->manager
->api_bus
) {
3488 /* If the bus is already available, install the match directly.
3489 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3490 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3492 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3495 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3497 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3498 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3499 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3505 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3509 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3510 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3511 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3514 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3515 _cleanup_free_
char *e
= NULL
;
3521 /* Adds in links to the device node that this unit is based on */
3525 if (!is_device_path(what
))
3528 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3529 if (!unit_type_supported(UNIT_DEVICE
))
3532 r
= unit_name_from_path(what
, ".device", &e
);
3536 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3540 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3541 dep
= UNIT_BINDS_TO
;
3543 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3544 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3545 device
, true, mask
);
3548 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3549 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3557 if (!path_startswith(what
, "/dev/"))
3560 /* If we don't support devices, then also don't bother with blockdev@.target */
3561 if (!unit_type_supported(UNIT_DEVICE
))
3564 r
= unit_name_path_escape(what
, &escaped
);
3568 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3572 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3575 int unit_coldplug(Unit
*u
) {
3582 /* Make sure we don't enter a loop, when coldplugging recursively. */
3586 u
->coldplugged
= true;
3588 STRV_FOREACH(i
, u
->deserialized_refs
) {
3589 q
= bus_unit_track_add_name(u
, *i
);
3590 if (q
< 0 && r
>= 0)
3593 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3595 if (UNIT_VTABLE(u
)->coldplug
) {
3596 q
= UNIT_VTABLE(u
)->coldplug(u
);
3597 if (q
< 0 && r
>= 0)
3601 uj
= u
->job
?: u
->nop_job
;
3603 q
= job_coldplug(uj
);
3604 if (q
< 0 && r
>= 0)
3611 void unit_catchup(Unit
*u
) {
3614 if (UNIT_VTABLE(u
)->catchup
)
3615 UNIT_VTABLE(u
)->catchup(u
);
3618 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3624 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3625 * are never out-of-date. */
3626 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3629 if (stat(path
, &st
) < 0)
3630 /* What, cannot access this anymore? */
3634 /* For masked files check if they are still so */
3635 return !null_or_empty(&st
);
3637 /* For non-empty files check the mtime */
3638 return timespec_load(&st
.st_mtim
) > mtime
;
3643 bool unit_need_daemon_reload(Unit
*u
) {
3644 _cleanup_strv_free_
char **t
= NULL
;
3649 /* For unit files, we allow masking… */
3650 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3651 u
->load_state
== UNIT_MASKED
))
3654 /* Source paths should not be masked… */
3655 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3658 if (u
->load_state
== UNIT_LOADED
)
3659 (void) unit_find_dropin_paths(u
, &t
);
3660 if (!strv_equal(u
->dropin_paths
, t
))
3663 /* … any drop-ins that are masked are simply omitted from the list. */
3664 STRV_FOREACH(path
, u
->dropin_paths
)
3665 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3671 void unit_reset_failed(Unit
*u
) {
3674 if (UNIT_VTABLE(u
)->reset_failed
)
3675 UNIT_VTABLE(u
)->reset_failed(u
);
3677 ratelimit_reset(&u
->start_ratelimit
);
3678 u
->start_limit_hit
= false;
3681 Unit
*unit_following(Unit
*u
) {
3684 if (UNIT_VTABLE(u
)->following
)
3685 return UNIT_VTABLE(u
)->following(u
);
3690 bool unit_stop_pending(Unit
*u
) {
3693 /* This call does check the current state of the unit. It's
3694 * hence useful to be called from state change calls of the
3695 * unit itself, where the state isn't updated yet. This is
3696 * different from unit_inactive_or_pending() which checks both
3697 * the current state and for a queued job. */
3699 return unit_has_job_type(u
, JOB_STOP
);
3702 bool unit_inactive_or_pending(Unit
*u
) {
3705 /* Returns true if the unit is inactive or going down */
3707 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3710 if (unit_stop_pending(u
))
3716 bool unit_active_or_pending(Unit
*u
) {
3719 /* Returns true if the unit is active or going up */
3721 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3725 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3731 bool unit_will_restart_default(Unit
*u
) {
3734 return unit_has_job_type(u
, JOB_START
);
3737 bool unit_will_restart(Unit
*u
) {
3740 if (!UNIT_VTABLE(u
)->will_restart
)
3743 return UNIT_VTABLE(u
)->will_restart(u
);
3746 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3748 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3749 assert(SIGNAL_VALID(signo
));
3751 if (!UNIT_VTABLE(u
)->kill
)
3754 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3757 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3758 _cleanup_set_free_ Set
*pid_set
= NULL
;
3761 pid_set
= set_new(NULL
);
3765 /* Exclude the main/control pids from being killed via the cgroup */
3767 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3772 if (control_pid
> 0) {
3773 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3778 return TAKE_PTR(pid_set
);
3781 static int kill_common_log(pid_t pid
, int signo
, void *userdata
) {
3782 _cleanup_free_
char *comm
= NULL
;
3787 (void) get_process_comm(pid
, &comm
);
3788 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
3789 signal_to_string(signo
), pid
, strna(comm
));
3794 int unit_kill_common(
3800 sd_bus_error
*error
) {
3803 bool killed
= false;
3805 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
3806 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
3807 * stop a service ourselves. */
3809 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3811 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3813 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3816 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3817 if (control_pid
< 0)
3818 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3819 if (control_pid
== 0)
3820 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3823 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3824 if (control_pid
> 0) {
3825 _cleanup_free_
char *comm
= NULL
;
3826 (void) get_process_comm(control_pid
, &comm
);
3828 if (kill(control_pid
, signo
) < 0) {
3829 /* Report this failure both to the logs and to the client */
3830 sd_bus_error_set_errnof(
3832 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
3833 signal_to_string(signo
), control_pid
, strna(comm
));
3834 r
= log_unit_warning_errno(
3836 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
3837 signal_to_string(signo
), control_pid
, strna(comm
));
3839 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
3840 signal_to_string(signo
), control_pid
, strna(comm
));
3845 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3847 _cleanup_free_
char *comm
= NULL
;
3848 (void) get_process_comm(main_pid
, &comm
);
3850 if (kill(main_pid
, signo
) < 0) {
3852 sd_bus_error_set_errnof(
3854 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
3855 signal_to_string(signo
), main_pid
, strna(comm
));
3857 r
= log_unit_warning_errno(
3859 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
3860 signal_to_string(signo
), main_pid
, strna(comm
));
3862 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
3863 signal_to_string(signo
), main_pid
, strna(comm
));
3868 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3869 _cleanup_set_free_ Set
*pid_set
= NULL
;
3872 /* Exclude the main/control pids from being killed via the cgroup */
3873 pid_set
= unit_pid_set(main_pid
, control_pid
);
3877 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
3879 if (!IN_SET(q
, -ESRCH
, -ENOENT
)) {
3881 sd_bus_error_set_errnof(
3883 "Failed to send signal SIG%s to auxiliary processes: %m",
3884 signal_to_string(signo
));
3886 r
= log_unit_warning_errno(
3888 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
3889 signal_to_string(signo
));
3895 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
3896 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
3897 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
3902 int unit_following_set(Unit
*u
, Set
**s
) {
3906 if (UNIT_VTABLE(u
)->following_set
)
3907 return UNIT_VTABLE(u
)->following_set(u
, s
);
3913 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3918 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3919 r
= unit_file_get_state(
3920 u
->manager
->unit_file_scope
,
3923 &u
->unit_file_state
);
3925 u
->unit_file_state
= UNIT_FILE_BAD
;
3928 return u
->unit_file_state
;
3931 int unit_get_unit_file_preset(Unit
*u
) {
3934 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3935 u
->unit_file_preset
= unit_file_query_preset(
3936 u
->manager
->unit_file_scope
,
3938 basename(u
->fragment_path
),
3941 return u
->unit_file_preset
;
3944 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
3950 unit_ref_unset(ref
);
3952 ref
->source
= source
;
3953 ref
->target
= target
;
3954 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
3958 void unit_ref_unset(UnitRef
*ref
) {
3964 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
3965 * be unreferenced now. */
3966 unit_add_to_gc_queue(ref
->target
);
3968 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
3969 ref
->source
= ref
->target
= NULL
;
3972 static int user_from_unit_name(Unit
*u
, char **ret
) {
3974 static const uint8_t hash_key
[] = {
3975 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
3976 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
3979 _cleanup_free_
char *n
= NULL
;
3982 r
= unit_name_to_prefix(u
->id
, &n
);
3986 if (valid_user_group_name(n
, 0)) {
3991 /* If we can't use the unit name as a user name, then let's hash it and use that */
3992 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
3998 int unit_patch_contexts(Unit
*u
) {
4005 /* Patch in the manager defaults into the exec and cgroup
4006 * contexts, _after_ the rest of the settings have been
4009 ec
= unit_get_exec_context(u
);
4011 /* This only copies in the ones that need memory */
4012 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
4013 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4014 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4019 if (MANAGER_IS_USER(u
->manager
) &&
4020 !ec
->working_directory
) {
4022 r
= get_home_dir(&ec
->working_directory
);
4026 /* Allow user services to run, even if the
4027 * home directory is missing */
4028 ec
->working_directory_missing_ok
= true;
4031 if (ec
->private_devices
)
4032 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4034 if (ec
->protect_kernel_modules
)
4035 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4037 if (ec
->protect_kernel_logs
)
4038 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4040 if (ec
->protect_clock
)
4041 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4043 if (ec
->dynamic_user
) {
4045 r
= user_from_unit_name(u
, &ec
->user
);
4051 ec
->group
= strdup(ec
->user
);
4056 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4057 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4060 ec
->private_tmp
= true;
4061 ec
->remove_ipc
= true;
4062 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4063 if (ec
->protect_home
== PROTECT_HOME_NO
)
4064 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4066 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4068 ec
->no_new_privileges
= true;
4069 ec
->restrict_suid_sgid
= true;
4073 cc
= unit_get_cgroup_context(u
);
4076 if (ec
->private_devices
&&
4077 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4078 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4080 if ((ec
->root_image
|| !LIST_IS_EMPTY(ec
->mount_images
)) &&
4081 (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
)) {
4084 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4085 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4086 r
= cgroup_add_device_allow(cc
, p
, "rw");
4090 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4091 r
= cgroup_add_device_allow(cc
, p
, "rwm");
4096 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4097 * Same for mapper and verity. */
4098 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4099 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4105 if (ec
->protect_clock
) {
4106 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4115 ExecContext
*unit_get_exec_context(const Unit
*u
) {
4122 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4126 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4129 KillContext
*unit_get_kill_context(Unit
*u
) {
4136 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4140 return (KillContext
*) ((uint8_t*) u
+ offset
);
4143 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4149 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4153 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4156 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4162 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4166 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4169 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4172 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4175 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4176 return u
->manager
->lookup_paths
.transient
;
4178 if (flags
& UNIT_PERSISTENT
)
4179 return u
->manager
->lookup_paths
.persistent_control
;
4181 if (flags
& UNIT_RUNTIME
)
4182 return u
->manager
->lookup_paths
.runtime_control
;
4187 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4193 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4194 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4195 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4196 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4197 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4200 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4201 ret
= specifier_escape(s
);
4208 if (flags
& UNIT_ESCAPE_C
) {
4221 return ret
?: (char*) s
;
4224 return ret
?: strdup(s
);
4227 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4228 _cleanup_free_
char *result
= NULL
;
4232 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4233 * way suitable for ExecStart= stanzas */
4235 STRV_FOREACH(i
, l
) {
4236 _cleanup_free_
char *buf
= NULL
;
4241 p
= unit_escape_setting(*i
, flags
, &buf
);
4245 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4246 if (!GREEDY_REALLOC(result
, n
+ a
+ 1))
4260 if (!GREEDY_REALLOC(result
, n
+ 1))
4265 return TAKE_PTR(result
);
4268 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4269 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4270 const char *dir
, *wrapped
;
4277 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4280 data
= unit_escape_setting(data
, flags
, &escaped
);
4284 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4285 * previous section header is the same */
4287 if (flags
& UNIT_PRIVATE
) {
4288 if (!UNIT_VTABLE(u
)->private_section
)
4291 if (!u
->transient_file
|| u
->last_section_private
< 0)
4292 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4293 else if (u
->last_section_private
== 0)
4294 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4296 if (!u
->transient_file
|| u
->last_section_private
< 0)
4297 data
= strjoina("[Unit]\n", data
);
4298 else if (u
->last_section_private
> 0)
4299 data
= strjoina("\n[Unit]\n", data
);
4302 if (u
->transient_file
) {
4303 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4304 * write to the transient unit file. */
4305 fputs(data
, u
->transient_file
);
4307 if (!endswith(data
, "\n"))
4308 fputc('\n', u
->transient_file
);
4310 /* Remember which section we wrote this entry to */
4311 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4315 dir
= unit_drop_in_dir(u
, flags
);
4319 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4320 "# or an equivalent operation. Do not edit.\n",
4324 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4328 (void) mkdir_p_label(p
, 0755);
4330 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4331 * recreate the cache after every drop-in we write. */
4332 if (u
->manager
->unit_path_cache
) {
4333 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4338 r
= write_string_file_atomic_label(q
, wrapped
);
4342 r
= strv_push(&u
->dropin_paths
, q
);
4347 strv_uniq(u
->dropin_paths
);
4349 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4354 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4355 _cleanup_free_
char *p
= NULL
;
4363 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4366 va_start(ap
, format
);
4367 r
= vasprintf(&p
, format
, ap
);
4373 return unit_write_setting(u
, flags
, name
, p
);
4376 int unit_make_transient(Unit
*u
) {
4377 _cleanup_free_
char *path
= NULL
;
4382 if (!UNIT_VTABLE(u
)->can_transient
)
4385 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4387 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4391 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4392 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4394 RUN_WITH_UMASK(0022) {
4395 f
= fopen(path
, "we");
4400 safe_fclose(u
->transient_file
);
4401 u
->transient_file
= f
;
4403 free_and_replace(u
->fragment_path
, path
);
4405 u
->source_path
= mfree(u
->source_path
);
4406 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4407 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4409 u
->load_state
= UNIT_STUB
;
4411 u
->transient
= true;
4413 unit_add_to_dbus_queue(u
);
4414 unit_add_to_gc_queue(u
);
4416 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4422 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4423 _cleanup_free_
char *comm
= NULL
;
4425 (void) get_process_comm(pid
, &comm
);
4427 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4428 only, like for example systemd's own PAM stub process. */
4429 if (comm
&& comm
[0] == '(')
4432 log_unit_notice(userdata
,
4433 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4436 signal_to_string(sig
));
4441 static int operation_to_signal(const KillContext
*c
, KillOperation k
, bool *noteworthy
) {
4446 case KILL_TERMINATE
:
4447 case KILL_TERMINATE_AND_LOG
:
4448 *noteworthy
= false;
4449 return c
->kill_signal
;
4452 *noteworthy
= false;
4453 return restart_kill_signal(c
);
4457 return c
->final_kill_signal
;
4461 return c
->watchdog_signal
;
4464 assert_not_reached("KillOperation unknown");
4468 int unit_kill_context(
4474 bool main_pid_alien
) {
4476 bool wait_for_exit
= false, send_sighup
;
4477 cg_kill_log_func_t log_func
= NULL
;
4483 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
4484 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
4485 * which is used for user-requested killing of unit processes. */
4487 if (c
->kill_mode
== KILL_NONE
)
4491 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4493 log_func
= log_kill
;
4497 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4502 log_func(main_pid
, sig
, u
);
4504 r
= kill_and_sigcont(main_pid
, sig
);
4505 if (r
< 0 && r
!= -ESRCH
) {
4506 _cleanup_free_
char *comm
= NULL
;
4507 (void) get_process_comm(main_pid
, &comm
);
4509 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4511 if (!main_pid_alien
)
4512 wait_for_exit
= true;
4514 if (r
!= -ESRCH
&& send_sighup
)
4515 (void) kill(main_pid
, SIGHUP
);
4519 if (control_pid
> 0) {
4521 log_func(control_pid
, sig
, u
);
4523 r
= kill_and_sigcont(control_pid
, sig
);
4524 if (r
< 0 && r
!= -ESRCH
) {
4525 _cleanup_free_
char *comm
= NULL
;
4526 (void) get_process_comm(control_pid
, &comm
);
4528 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4530 wait_for_exit
= true;
4532 if (r
!= -ESRCH
&& send_sighup
)
4533 (void) kill(control_pid
, SIGHUP
);
4537 if (u
->cgroup_path
&&
4538 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4539 _cleanup_set_free_ Set
*pid_set
= NULL
;
4541 /* Exclude the main/control pids from being killed via the cgroup */
4542 pid_set
= unit_pid_set(main_pid
, control_pid
);
4546 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4548 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4552 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4553 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
4557 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4558 * we are running in a container or if this is a delegation unit, simply because cgroup
4559 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4560 * of containers it can be confused easily by left-over directories in the cgroup — which
4561 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4562 * there we get proper events. Hence rely on them. */
4564 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4565 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4566 wait_for_exit
= true;
4571 pid_set
= unit_pid_set(main_pid
, control_pid
);
4575 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4584 return wait_for_exit
;
4587 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4593 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these
4594 * paths in the unit (from the path to the UnitDependencyInfo structure indicating how to the
4595 * dependency came to be). However, we build a prefix table for all possible prefixes so that new
4596 * appearing mount units can easily determine which units to make themselves a dependency of. */
4598 if (!path_is_absolute(path
))
4601 if (hashmap_contains(u
->requires_mounts_for
, path
)) /* Exit quickly if the path is already covered. */
4604 _cleanup_free_
char *p
= strdup(path
);
4608 /* Use the canonical form of the path as the stored key. We call path_is_normalized()
4609 * only after simplification, since path_is_normalized() rejects paths with '.'.
4610 * path_is_normalized() also verifies that the path fits in PATH_MAX. */
4611 path
= path_simplify(p
);
4613 if (!path_is_normalized(path
))
4616 UnitDependencyInfo di
= {
4620 r
= hashmap_ensure_put(&u
->requires_mounts_for
, &path_hash_ops
, p
, di
.data
);
4624 TAKE_PTR(p
); /* path remains a valid pointer to the string stored in the hashmap */
4626 char prefix
[strlen(path
) + 1];
4627 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4630 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4632 _cleanup_free_
char *q
= NULL
;
4634 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4646 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4662 int unit_setup_exec_runtime(Unit
*u
) {
4668 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4671 /* Check if there already is an ExecRuntime for this unit? */
4672 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4676 /* Try to get it from somebody else */
4677 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_JOINS_NAMESPACE_OF
) {
4678 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4683 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4686 int unit_setup_dynamic_creds(Unit
*u
) {
4688 DynamicCreds
*dcreds
;
4693 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4695 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4697 ec
= unit_get_exec_context(u
);
4700 if (!ec
->dynamic_user
)
4703 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4706 bool unit_type_supported(UnitType t
) {
4707 if (_unlikely_(t
< 0))
4709 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4712 if (!unit_vtable
[t
]->supported
)
4715 return unit_vtable
[t
]->supported();
4718 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4724 if (!unit_log_level_test(u
, LOG_NOTICE
))
4727 r
= dir_is_empty(where
);
4728 if (r
> 0 || r
== -ENOTDIR
)
4731 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4735 log_unit_struct(u
, LOG_NOTICE
,
4736 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4737 LOG_UNIT_INVOCATION_ID(u
),
4738 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4742 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4743 _cleanup_free_
char *canonical_where
= NULL
;
4749 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
4751 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4755 /* We will happily ignore a trailing slash (or any redundant slashes) */
4756 if (path_equal(where
, canonical_where
))
4759 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4760 log_unit_struct(u
, LOG_ERR
,
4761 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4762 LOG_UNIT_INVOCATION_ID(u
),
4763 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4769 bool unit_is_pristine(Unit
*u
) {
4772 /* Check if the unit already exists or is already around,
4773 * in a number of different ways. Note that to cater for unit
4774 * types such as slice, we are generally fine with units that
4775 * are marked UNIT_LOADED even though nothing was actually
4776 * loaded, as those unit types don't require a file on disk. */
4778 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4781 !strv_isempty(u
->dropin_paths
) ||
4786 pid_t
unit_control_pid(Unit
*u
) {
4789 if (UNIT_VTABLE(u
)->control_pid
)
4790 return UNIT_VTABLE(u
)->control_pid(u
);
4795 pid_t
unit_main_pid(Unit
*u
) {
4798 if (UNIT_VTABLE(u
)->main_pid
)
4799 return UNIT_VTABLE(u
)->main_pid(u
);
4804 static void unit_unref_uid_internal(
4808 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4812 assert(_manager_unref_uid
);
4814 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4815 * gid_t are actually the same time, with the same validity rules.
4817 * Drops a reference to UID/GID from a unit. */
4819 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4820 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4822 if (!uid_is_valid(*ref_uid
))
4825 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4826 *ref_uid
= UID_INVALID
;
4829 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4830 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4833 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4834 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4837 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4840 unit_unref_uid(u
, destroy_now
);
4841 unit_unref_gid(u
, destroy_now
);
4844 static int unit_ref_uid_internal(
4849 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4855 assert(uid_is_valid(uid
));
4856 assert(_manager_ref_uid
);
4858 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4859 * are actually the same type, and have the same validity rules.
4861 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4862 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4865 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4866 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4868 if (*ref_uid
== uid
)
4871 if (uid_is_valid(*ref_uid
)) /* Already set? */
4874 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4882 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4883 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4886 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4887 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4890 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4895 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4897 if (uid_is_valid(uid
)) {
4898 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4903 if (gid_is_valid(gid
)) {
4904 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4907 unit_unref_uid(u
, false);
4913 return r
> 0 || q
> 0;
4916 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4922 c
= unit_get_exec_context(u
);
4924 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4926 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4931 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4936 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4937 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4938 * objects when no service references the UID/GID anymore. */
4940 r
= unit_ref_uid_gid(u
, uid
, gid
);
4942 unit_add_to_dbus_queue(u
);
4945 int unit_acquire_invocation_id(Unit
*u
) {
4951 r
= sd_id128_randomize(&id
);
4953 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
4955 r
= unit_set_invocation_id(u
, id
);
4957 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
4959 unit_add_to_dbus_queue(u
);
4963 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
4969 /* Copy parameters from manager */
4970 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
4974 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
4975 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
4976 p
->prefix
= u
->manager
->prefix
;
4977 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
4979 /* Copy parameters from unit */
4980 p
->cgroup_path
= u
->cgroup_path
;
4981 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
4983 p
->received_credentials
= u
->manager
->received_credentials
;
4988 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
4994 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
4995 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
4997 (void) unit_realize_cgroup(u
);
4999 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5003 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
);
5004 (void) ignore_signals(SIGPIPE
);
5006 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5008 if (u
->cgroup_path
) {
5009 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5011 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", u
->cgroup_path
);
5019 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5026 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5030 int ret
= EXIT_SUCCESS
;
5033 STRV_FOREACH(i
, paths
) {
5034 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5036 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5044 r
= unit_watch_pid(u
, pid
, true);
5052 static void unit_update_dependency_mask(Hashmap
*deps
, Unit
*other
, UnitDependencyInfo di
) {
5056 if (di
.origin_mask
== 0 && di
.destination_mask
== 0)
5057 /* No bit set anymore, let's drop the whole entry */
5058 assert_se(hashmap_remove(deps
, other
));
5060 /* Mask was reduced, let's update the entry */
5061 assert_se(hashmap_update(deps
, other
, di
.data
) == 0);
5064 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5068 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5073 HASHMAP_FOREACH(deps
, u
->dependencies
) {
5077 UnitDependencyInfo di
;
5082 HASHMAP_FOREACH_KEY(di
.data
, other
, deps
) {
5083 Hashmap
*other_deps
;
5085 if (FLAGS_SET(~mask
, di
.origin_mask
))
5088 di
.origin_mask
&= ~mask
;
5089 unit_update_dependency_mask(deps
, other
, di
);
5091 /* We updated the dependency from our unit to the other unit now. But most
5092 * dependencies imply a reverse dependency. Hence, let's delete that one
5093 * too. For that we go through all dependency types on the other unit and
5094 * delete all those which point to us and have the right mask set. */
5096 HASHMAP_FOREACH(other_deps
, other
->dependencies
) {
5097 UnitDependencyInfo dj
;
5099 dj
.data
= hashmap_get(other_deps
, u
);
5100 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5103 dj
.destination_mask
&= ~mask
;
5104 unit_update_dependency_mask(other_deps
, u
, dj
);
5107 unit_add_to_gc_queue(other
);
5117 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5124 if (MANAGER_IS_SYSTEM(u
->manager
))
5125 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5127 _cleanup_free_
char *user_path
= NULL
;
5128 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5131 p
= strjoin(user_path
, u
->id
);
5141 static int unit_export_invocation_id(Unit
*u
) {
5142 _cleanup_free_
char *p
= NULL
;
5147 if (u
->exported_invocation_id
)
5150 if (sd_id128_is_null(u
->invocation_id
))
5153 r
= unit_get_invocation_path(u
, &p
);
5155 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5157 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5159 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5161 u
->exported_invocation_id
= true;
5165 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5173 if (u
->exported_log_level_max
)
5176 if (c
->log_level_max
< 0)
5179 assert(c
->log_level_max
<= 7);
5181 buf
[0] = '0' + c
->log_level_max
;
5184 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5185 r
= symlink_atomic(buf
, p
);
5187 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5189 u
->exported_log_level_max
= true;
5193 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5194 _cleanup_close_
int fd
= -1;
5195 struct iovec
*iovec
;
5202 if (u
->exported_log_extra_fields
)
5205 if (c
->n_log_extra_fields
<= 0)
5208 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5209 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5211 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5212 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5214 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5215 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5218 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5219 pattern
= strjoina(p
, ".XXXXXX");
5221 fd
= mkostemp_safe(pattern
);
5223 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5225 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5227 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5231 (void) fchmod(fd
, 0644);
5233 if (rename(pattern
, p
) < 0) {
5234 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5238 u
->exported_log_extra_fields
= true;
5242 (void) unlink(pattern
);
5246 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5247 _cleanup_free_
char *buf
= NULL
;
5254 if (u
->exported_log_ratelimit_interval
)
5257 if (c
->log_ratelimit_interval_usec
== 0)
5260 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5262 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5265 r
= symlink_atomic(buf
, p
);
5267 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5269 u
->exported_log_ratelimit_interval
= true;
5273 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5274 _cleanup_free_
char *buf
= NULL
;
5281 if (u
->exported_log_ratelimit_burst
)
5284 if (c
->log_ratelimit_burst
== 0)
5287 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5289 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5292 r
= symlink_atomic(buf
, p
);
5294 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5296 u
->exported_log_ratelimit_burst
= true;
5300 void unit_export_state_files(Unit
*u
) {
5301 const ExecContext
*c
;
5308 if (MANAGER_IS_TEST_RUN(u
->manager
))
5311 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5312 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5313 * the IPC system itself and PID 1 also log to the journal.
5315 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5316 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5317 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5318 * namespace at least.
5320 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5321 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5324 (void) unit_export_invocation_id(u
);
5326 if (!MANAGER_IS_SYSTEM(u
->manager
))
5329 c
= unit_get_exec_context(u
);
5331 (void) unit_export_log_level_max(u
, c
);
5332 (void) unit_export_log_extra_fields(u
, c
);
5333 (void) unit_export_log_ratelimit_interval(u
, c
);
5334 (void) unit_export_log_ratelimit_burst(u
, c
);
5338 void unit_unlink_state_files(Unit
*u
) {
5346 /* Undoes the effect of unit_export_state() */
5348 if (u
->exported_invocation_id
) {
5349 _cleanup_free_
char *invocation_path
= NULL
;
5350 int r
= unit_get_invocation_path(u
, &invocation_path
);
5352 (void) unlink(invocation_path
);
5353 u
->exported_invocation_id
= false;
5357 if (!MANAGER_IS_SYSTEM(u
->manager
))
5360 if (u
->exported_log_level_max
) {
5361 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5364 u
->exported_log_level_max
= false;
5367 if (u
->exported_log_extra_fields
) {
5368 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5371 u
->exported_log_extra_fields
= false;
5374 if (u
->exported_log_ratelimit_interval
) {
5375 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5378 u
->exported_log_ratelimit_interval
= false;
5381 if (u
->exported_log_ratelimit_burst
) {
5382 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5385 u
->exported_log_ratelimit_burst
= false;
5389 int unit_prepare_exec(Unit
*u
) {
5394 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5395 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5396 r
= bpf_firewall_load_custom(u
);
5400 /* Prepares everything so that we can fork of a process for this unit */
5402 (void) unit_realize_cgroup(u
);
5404 if (u
->reset_accounting
) {
5405 (void) unit_reset_accounting(u
);
5406 u
->reset_accounting
= false;
5409 unit_export_state_files(u
);
5411 r
= unit_setup_exec_runtime(u
);
5415 r
= unit_setup_dynamic_creds(u
);
5422 static bool ignore_leftover_process(const char *comm
) {
5423 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5426 int unit_log_leftover_process_start(pid_t pid
, int sig
, void *userdata
) {
5427 _cleanup_free_
char *comm
= NULL
;
5429 (void) get_process_comm(pid
, &comm
);
5431 if (ignore_leftover_process(comm
))
5434 /* During start we print a warning */
5436 log_unit_warning(userdata
,
5437 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5438 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5444 int unit_log_leftover_process_stop(pid_t pid
, int sig
, void *userdata
) {
5445 _cleanup_free_
char *comm
= NULL
;
5447 (void) get_process_comm(pid
, &comm
);
5449 if (ignore_leftover_process(comm
))
5452 /* During stop we only print an informational message */
5454 log_unit_info(userdata
,
5455 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
5461 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
5464 (void) unit_pick_cgroup_path(u
);
5466 if (!u
->cgroup_path
)
5469 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_func
, u
);
5472 bool unit_needs_console(Unit
*u
) {
5474 UnitActiveState state
;
5478 state
= unit_active_state(u
);
5480 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5483 if (UNIT_VTABLE(u
)->needs_console
)
5484 return UNIT_VTABLE(u
)->needs_console(u
);
5486 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5487 ec
= unit_get_exec_context(u
);
5491 return exec_context_may_touch_console(ec
);
5494 const char *unit_label_path(const Unit
*u
) {
5499 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
5500 * when validating access checks. */
5502 p
= u
->source_path
?: u
->fragment_path
;
5506 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
5507 if (null_or_empty_path(p
) > 0)
5513 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5518 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5519 * and not a kernel thread either */
5521 /* First, a simple range check */
5522 if (!pid_is_valid(pid
))
5523 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5525 /* Some extra safety check */
5526 if (pid
== 1 || pid
== getpid_cached())
5527 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5529 /* Don't even begin to bother with kernel threads */
5530 r
= is_kernel_thread(pid
);
5532 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5534 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5536 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5541 void unit_log_success(Unit
*u
) {
5544 /* Let's show message "Deactivated successfully" in debug mode (when manager is user) rather than in info mode.
5545 * This message has low information value for regular users and it might be a bit overwhelming on a system with
5546 * a lot of devices. */
5548 MANAGER_IS_USER(u
->manager
) ? LOG_DEBUG
: LOG_INFO
,
5549 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5550 LOG_UNIT_INVOCATION_ID(u
),
5551 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
5554 void unit_log_failure(Unit
*u
, const char *result
) {
5558 log_unit_struct(u
, LOG_WARNING
,
5559 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5560 LOG_UNIT_INVOCATION_ID(u
),
5561 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5562 "UNIT_RESULT=%s", result
);
5565 void unit_log_skip(Unit
*u
, const char *result
) {
5569 log_unit_struct(u
, LOG_INFO
,
5570 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5571 LOG_UNIT_INVOCATION_ID(u
),
5572 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5573 "UNIT_RESULT=%s", result
);
5576 void unit_log_process_exit(
5579 const char *command
,
5589 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5590 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5591 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5595 else if (code
== CLD_EXITED
)
5598 level
= LOG_WARNING
;
5600 log_unit_struct(u
, level
,
5601 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5602 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s%s",
5604 sigchld_code_to_string(code
), status
,
5605 strna(code
== CLD_EXITED
5606 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5607 : signal_to_string(status
)),
5608 success
? " (success)" : ""),
5609 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5610 "EXIT_STATUS=%i", status
,
5611 "COMMAND=%s", strna(command
),
5612 LOG_UNIT_INVOCATION_ID(u
));
5615 int unit_exit_status(Unit
*u
) {
5618 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5619 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5620 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5621 * service process has exited abnormally (signal/coredump). */
5623 if (!UNIT_VTABLE(u
)->exit_status
)
5626 return UNIT_VTABLE(u
)->exit_status(u
);
5629 int unit_failure_action_exit_status(Unit
*u
) {
5634 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5636 if (u
->failure_action_exit_status
>= 0)
5637 return u
->failure_action_exit_status
;
5639 r
= unit_exit_status(u
);
5640 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5646 int unit_success_action_exit_status(Unit
*u
) {
5651 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5653 if (u
->success_action_exit_status
>= 0)
5654 return u
->success_action_exit_status
;
5656 r
= unit_exit_status(u
);
5657 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5663 int unit_test_trigger_loaded(Unit
*u
) {
5666 /* Tests whether the unit to trigger is loaded */
5668 trigger
= UNIT_TRIGGER(u
);
5670 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5671 "Refusing to start, no unit to trigger.");
5672 if (trigger
->load_state
!= UNIT_LOADED
)
5673 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5674 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
5679 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
5683 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
||
5684 (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
&& !unit_will_restart(u
)))
5685 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
5687 exec_context_destroy_credentials(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], u
->id
);
5690 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
5691 UnitActiveState state
;
5695 /* Special return values:
5697 * -EOPNOTSUPP → cleaning not supported for this unit type
5698 * -EUNATCH → cleaning not defined for this resource type
5699 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
5700 * a job queued or similar
5703 if (!UNIT_VTABLE(u
)->clean
)
5709 if (u
->load_state
!= UNIT_LOADED
)
5715 state
= unit_active_state(u
);
5716 if (!IN_SET(state
, UNIT_INACTIVE
))
5719 return UNIT_VTABLE(u
)->clean(u
, mask
);
5722 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
5725 if (!UNIT_VTABLE(u
)->clean
||
5726 u
->load_state
!= UNIT_LOADED
) {
5731 /* When the clean() method is set, can_clean() really should be set too */
5732 assert(UNIT_VTABLE(u
)->can_clean
);
5734 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
5737 bool unit_can_freeze(Unit
*u
) {
5740 if (UNIT_VTABLE(u
)->can_freeze
)
5741 return UNIT_VTABLE(u
)->can_freeze(u
);
5743 return UNIT_VTABLE(u
)->freeze
;
5746 void unit_frozen(Unit
*u
) {
5749 u
->freezer_state
= FREEZER_FROZEN
;
5751 bus_unit_send_pending_freezer_message(u
);
5754 void unit_thawed(Unit
*u
) {
5757 u
->freezer_state
= FREEZER_RUNNING
;
5759 bus_unit_send_pending_freezer_message(u
);
5762 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
5764 int (*method
)(Unit
*);
5768 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
5770 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
5771 if (!method
|| !cg_freezer_supported())
5777 if (u
->load_state
!= UNIT_LOADED
)
5780 s
= unit_active_state(u
);
5781 if (s
!= UNIT_ACTIVE
)
5784 if (IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
))
5794 int unit_freeze(Unit
*u
) {
5795 return unit_freezer_action(u
, FREEZER_FREEZE
);
5798 int unit_thaw(Unit
*u
) {
5799 return unit_freezer_action(u
, FREEZER_THAW
);
5802 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
5803 int unit_freeze_vtable_common(Unit
*u
) {
5804 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
5807 int unit_thaw_vtable_common(Unit
*u
) {
5808 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
5811 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5812 [COLLECT_INACTIVE
] = "inactive",
5813 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5816 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);
5818 Unit
* unit_has_dependency(const Unit
*u
, UnitDependencyAtom atom
, Unit
*other
) {
5823 /* Checks if the unit has a dependency on 'other' with the specified dependency atom. If 'other' is
5824 * NULL checks if the unit has *any* dependency of that atom. Returns 'other' if found (or if 'other'
5825 * is NULL the first entry found), or NULL if not found. */
5827 UNIT_FOREACH_DEPENDENCY(i
, u
, atom
)
5828 if (!other
|| other
== i
)
5834 int unit_get_dependency_array(const Unit
*u
, UnitDependencyAtom atom
, Unit
***ret_array
) {
5835 _cleanup_free_ Unit
**array
= NULL
;
5842 /* Gets a list of units matching a specific atom as array. This is useful when iterating through
5843 * dependencies while modifying them: the array is an "atomic snapshot" of sorts, that can be read
5844 * while the dependency table is continuously updated. */
5846 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
5847 if (!GREEDY_REALLOC(array
, n
+ 1))
5853 *ret_array
= TAKE_PTR(array
);
5855 assert(n
<= INT_MAX
);