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 uint64_t value
= UINT64_MAX
;
2300 assert(io_fields
[k
]);
2302 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2303 if (value
== UINT64_MAX
)
2306 have_io_accounting
= true;
2310 /* Format IO accounting data for inclusion in the structured log message */
2311 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2315 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2317 /* Format the IO accounting data for inclusion in the human language message string, but only
2318 * for the bytes counters (and not for the operations counters) */
2319 if (k
== CGROUP_IO_READ_BYTES
) {
2321 rr
= strjoin("read ", strna(FORMAT_BYTES(value
)), " from disk");
2326 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2328 wr
= strjoin("written ", strna(FORMAT_BYTES(value
)), " to disk");
2335 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2336 log_level
= raise_level(log_level
,
2337 value
> MENTIONWORTHY_IO_BYTES
,
2338 value
> NOTICEWORTHY_IO_BYTES
);
2341 if (have_io_accounting
) {
2344 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2346 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2351 k
= strdup("no IO");
2357 message_parts
[n_message_parts
++] = k
;
2361 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2362 uint64_t value
= UINT64_MAX
;
2364 assert(ip_fields
[m
]);
2366 (void) unit_get_ip_accounting(u
, m
, &value
);
2367 if (value
== UINT64_MAX
)
2370 have_ip_accounting
= true;
2374 /* Format IP accounting data for inclusion in the structured log message */
2375 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2379 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2381 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2382 * bytes counters (and not for the packets counters) */
2383 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2385 igress
= strjoin("received ", strna(FORMAT_BYTES(value
)), " IP traffic");
2390 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2392 egress
= strjoin("sent ", strna(FORMAT_BYTES(value
)), " IP traffic");
2399 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2400 log_level
= raise_level(log_level
,
2401 value
> MENTIONWORTHY_IP_BYTES
,
2402 value
> NOTICEWORTHY_IP_BYTES
);
2405 /* This check is here because it is the earliest point following all possible log_level assignments. If
2406 * log_level is assigned anywhere after this point, move this check. */
2407 if (!unit_log_level_test(u
, log_level
)) {
2412 if (have_ip_accounting
) {
2415 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2417 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2422 k
= strdup("no IP traffic");
2428 message_parts
[n_message_parts
++] = k
;
2432 /* Is there any accounting data available at all? */
2438 if (n_message_parts
== 0)
2439 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2441 _cleanup_free_
char *joined
= NULL
;
2443 message_parts
[n_message_parts
] = NULL
;
2445 joined
= strv_join(message_parts
, ", ");
2451 joined
[0] = ascii_toupper(joined
[0]);
2452 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2455 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2456 * and hence don't increase n_iovec for them */
2457 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2458 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2460 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2461 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2463 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2464 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2466 log_unit_struct_iovec(u
, log_level
, iovec
, n_iovec
+ 4);
2470 for (size_t i
= 0; i
< n_message_parts
; i
++)
2471 free(message_parts
[i
]);
2473 for (size_t i
= 0; i
< n_iovec
; i
++)
2474 free(iovec
[i
].iov_base
);
2480 static void unit_update_on_console(Unit
*u
) {
2485 b
= unit_needs_console(u
);
2486 if (u
->on_console
== b
)
2491 manager_ref_console(u
->manager
);
2493 manager_unref_console(u
->manager
);
2496 static void unit_emit_audit_start(Unit
*u
) {
2499 if (u
->type
!= UNIT_SERVICE
)
2502 /* Write audit record if we have just finished starting up */
2503 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2507 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2510 if (u
->type
!= UNIT_SERVICE
)
2514 /* Write audit record if we have just finished shutting down */
2515 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2516 u
->in_audit
= false;
2518 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2519 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2521 if (state
== UNIT_INACTIVE
)
2522 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2526 static bool unit_process_job(Job
*j
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2527 bool unexpected
= false;
2532 if (j
->state
== JOB_WAITING
)
2534 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2536 job_add_to_run_queue(j
);
2538 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2539 * hence needs to invalidate jobs. */
2544 case JOB_VERIFY_ACTIVE
:
2546 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2547 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2548 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2551 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2552 if (ns
== UNIT_FAILED
)
2553 result
= JOB_FAILED
;
2557 job_finish_and_invalidate(j
, result
, true, false);
2564 case JOB_RELOAD_OR_START
:
2565 case JOB_TRY_RELOAD
:
2567 if (j
->state
== JOB_RUNNING
) {
2568 if (ns
== UNIT_ACTIVE
)
2569 job_finish_and_invalidate(j
, (flags
& UNIT_NOTIFY_RELOAD_FAILURE
) ? JOB_FAILED
: JOB_DONE
, true, false);
2570 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2573 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2574 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2582 case JOB_TRY_RESTART
:
2584 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2585 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2586 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2588 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2594 assert_not_reached("Job type unknown");
2600 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2605 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2606 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2608 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2609 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2610 * remounted this function will be called too! */
2614 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2615 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2616 unit_add_to_dbus_queue(u
);
2618 /* Update systemd-oomd on the property/state change */
2620 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2622 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2623 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2624 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2625 * have the information on the property. Thus, indiscriminately send an update. */
2626 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2627 (void) manager_varlink_send_managed_oom_update(u
);
2630 /* Update timestamps for state changes */
2631 if (!MANAGER_IS_RELOADING(m
)) {
2632 dual_timestamp_get(&u
->state_change_timestamp
);
2634 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2635 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2636 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2637 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2639 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2640 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2641 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2642 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2645 /* Keep track of failed units */
2646 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2648 /* Make sure the cgroup and state files are always removed when we become inactive */
2649 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2650 SET_FLAG(u
->markers
,
2651 (1u << UNIT_MARKER_NEEDS_RELOAD
)|(1u << UNIT_MARKER_NEEDS_RESTART
),
2653 unit_prune_cgroup(u
);
2654 unit_unlink_state_files(u
);
2655 } else if (ns
!= os
&& ns
== UNIT_RELOADING
)
2656 SET_FLAG(u
->markers
, 1u << UNIT_MARKER_NEEDS_RELOAD
, false);
2658 unit_update_on_console(u
);
2660 if (!MANAGER_IS_RELOADING(m
)) {
2663 /* Let's propagate state changes to the job */
2665 unexpected
= unit_process_job(u
->job
, ns
, flags
);
2669 /* If this state change happened without being requested by a job, then let's retroactively start or
2670 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2671 * additional jobs just because something is already activated. */
2674 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2675 retroactively_start_dependencies(u
);
2676 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2677 retroactively_stop_dependencies(u
);
2680 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2681 log_unit_debug(u
, "Unit entered failed state.");
2683 if (!(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2684 unit_start_on_failure(u
, "OnFailure=", UNIT_ATOM_ON_FAILURE
, u
->on_failure_job_mode
);
2687 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2688 /* This unit just finished starting up */
2690 unit_emit_audit_start(u
);
2691 manager_send_unit_plymouth(m
, u
);
2694 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2695 /* This unit just stopped/failed. */
2697 unit_emit_audit_stop(u
, ns
);
2698 unit_log_resources(u
);
2701 if (ns
== UNIT_INACTIVE
&& !IN_SET(os
, UNIT_FAILED
, UNIT_INACTIVE
, UNIT_MAINTENANCE
) &&
2702 !(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2703 unit_start_on_failure(u
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
, u
->on_success_job_mode
);
2706 manager_recheck_journal(m
);
2707 manager_recheck_dbus(m
);
2709 unit_trigger_notify(u
);
2711 if (!MANAGER_IS_RELOADING(m
)) {
2712 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2713 reason
= strjoina("unit ", u
->id
, " failed");
2714 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2715 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2716 reason
= strjoina("unit ", u
->id
, " succeeded");
2717 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2721 /* And now, add the unit or depending units to various queues that will act on the new situation if
2722 * needed. These queues generally check for continuous state changes rather than events (like most of
2723 * the state propagation above), and do work deferred instead of instantly, since they typically
2724 * don't want to run during reloading, and usually involve checking combined state of multiple units
2727 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2728 /* Stop unneeded units and bound-by units regardless if going down was expected or not */
2729 check_unneeded_dependencies(u
);
2730 check_bound_by_dependencies(u
);
2732 /* Maybe someone wants us to remain up? */
2733 unit_submit_to_start_when_upheld_queue(u
);
2735 /* Maybe the unit should be GC'ed now? */
2736 unit_add_to_gc_queue(u
);
2739 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2740 /* Start uphold units regardless if going up was expected or not */
2741 check_uphold_dependencies(u
);
2743 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2744 unit_submit_to_stop_when_unneeded_queue(u
);
2746 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens
2747 * when something BindsTo= to a Type=oneshot unit, as these units go directly from starting to
2748 * inactive, without ever entering started.) */
2749 unit_submit_to_stop_when_bound_queue(u
);
2753 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2757 assert(pid_is_valid(pid
));
2759 /* Watch a specific PID */
2761 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2762 * opportunity to remove any stalled references to this PID as they can be created
2763 * easily (when watching a process which is not our direct child). */
2765 manager_unwatch_pid(u
->manager
, pid
);
2767 r
= set_ensure_allocated(&u
->pids
, NULL
);
2771 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2775 /* First try, let's add the unit keyed by "pid". */
2776 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2782 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2783 * to an array of Units rather than just a Unit), lists us already. */
2785 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2787 for (; array
[n
]; n
++)
2791 if (found
) /* Found it already? if so, do nothing */
2796 /* Allocate a new array */
2797 new_array
= new(Unit
*, n
+ 2);
2801 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2803 new_array
[n
+1] = NULL
;
2805 /* Add or replace the old array */
2806 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2817 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2824 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2828 assert(pid_is_valid(pid
));
2830 /* First let's drop the unit in case it's keyed as "pid". */
2831 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2833 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2834 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2836 /* Let's iterate through the array, dropping our own entry */
2839 for (size_t n
= 0; array
[n
]; n
++)
2841 array
[m
++] = array
[n
];
2845 /* The array is now empty, remove the entire entry */
2846 assert_se(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2851 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2854 void unit_unwatch_all_pids(Unit
*u
) {
2857 while (!set_isempty(u
->pids
))
2858 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2860 u
->pids
= set_free(u
->pids
);
2863 static void unit_tidy_watch_pids(Unit
*u
) {
2864 pid_t except1
, except2
;
2869 /* Cleans dead PIDs from our list */
2871 except1
= unit_main_pid(u
);
2872 except2
= unit_control_pid(u
);
2874 SET_FOREACH(e
, u
->pids
) {
2875 pid_t pid
= PTR_TO_PID(e
);
2877 if (pid
== except1
|| pid
== except2
)
2880 if (!pid_is_unwaited(pid
))
2881 unit_unwatch_pid(u
, pid
);
2885 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2891 unit_tidy_watch_pids(u
);
2892 unit_watch_all_pids(u
);
2894 /* If the PID set is empty now, then let's finish this off. */
2895 unit_synthesize_cgroup_empty_event(u
);
2900 int unit_enqueue_rewatch_pids(Unit
*u
) {
2905 if (!u
->cgroup_path
)
2908 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2911 if (r
> 0) /* On unified we can use proper notifications */
2914 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2915 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2916 * involves issuing kill(pid, 0) on all processes we watch. */
2918 if (!u
->rewatch_pids_event_source
) {
2919 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2921 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2923 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2925 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2927 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
2929 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2931 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2934 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2936 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2941 void unit_dequeue_rewatch_pids(Unit
*u
) {
2945 if (!u
->rewatch_pids_event_source
)
2948 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
2950 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
2952 u
->rewatch_pids_event_source
= sd_event_source_disable_unref(u
->rewatch_pids_event_source
);
2955 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2957 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2961 case JOB_VERIFY_ACTIVE
:
2964 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2965 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
2970 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2971 * external events), hence it makes no sense to permit enqueuing such a request either. */
2972 return !u
->perpetual
;
2975 case JOB_TRY_RESTART
:
2976 return unit_can_stop(u
) && unit_can_start(u
);
2979 case JOB_TRY_RELOAD
:
2980 return unit_can_reload(u
);
2982 case JOB_RELOAD_OR_START
:
2983 return unit_can_reload(u
) && unit_can_start(u
);
2986 assert_not_reached("Invalid job type");
2990 int unit_add_dependency(
2995 UnitDependencyMask mask
) {
2997 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
2998 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
2999 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
3000 [UNIT_WANTS
] = UNIT_WANTED_BY
,
3001 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
3002 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
3003 [UNIT_UPHOLDS
] = UNIT_UPHELD_BY
,
3004 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
3005 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
3006 [UNIT_WANTED_BY
] = UNIT_WANTS
,
3007 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
3008 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
3009 [UNIT_UPHELD_BY
] = UNIT_UPHOLDS
,
3010 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
3011 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
3012 [UNIT_BEFORE
] = UNIT_AFTER
,
3013 [UNIT_AFTER
] = UNIT_BEFORE
,
3014 [UNIT_ON_SUCCESS
] = UNIT_ON_SUCCESS_OF
,
3015 [UNIT_ON_SUCCESS_OF
] = UNIT_ON_SUCCESS
,
3016 [UNIT_ON_FAILURE
] = UNIT_ON_FAILURE_OF
,
3017 [UNIT_ON_FAILURE_OF
] = UNIT_ON_FAILURE
,
3018 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
3019 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
3020 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3021 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3022 [UNIT_PROPAGATES_STOP_TO
] = UNIT_STOP_PROPAGATED_FROM
,
3023 [UNIT_STOP_PROPAGATED_FROM
] = UNIT_PROPAGATES_STOP_TO
,
3024 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
, /* symmetric! 👓 */
3025 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3026 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3027 [UNIT_IN_SLICE
] = UNIT_SLICE_OF
,
3028 [UNIT_SLICE_OF
] = UNIT_IN_SLICE
,
3030 Unit
*original_u
= u
, *original_other
= other
;
3031 UnitDependencyAtom a
;
3034 /* Helper to know whether sending a notification is necessary or not: if the dependency is already
3035 * there, no need to notify! */
3039 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3042 u
= unit_follow_merge(u
);
3043 other
= unit_follow_merge(other
);
3044 a
= unit_dependency_to_atom(d
);
3047 /* We won't allow dependencies on ourselves. We will not consider them an error however. */
3049 unit_maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
3053 /* Note that ordering a device unit after a unit is permitted since it allows to start its job
3054 * running timeout at a specific time. */
3055 if (FLAGS_SET(a
, UNIT_ATOM_BEFORE
) && other
->type
== UNIT_DEVICE
) {
3056 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3060 if (FLAGS_SET(a
, UNIT_ATOM_ON_FAILURE
) && !UNIT_VTABLE(u
)->can_fail
) {
3061 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3065 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERS
) && !UNIT_VTABLE(u
)->can_trigger
)
3066 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3067 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3068 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERED_BY
) && !UNIT_VTABLE(other
)->can_trigger
)
3069 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3070 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3072 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && other
->type
!= UNIT_SLICE
)
3073 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3074 "Requested dependency Slice=%s refused (%s is not a slice unit).", other
->id
, other
->id
);
3075 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && u
->type
!= UNIT_SLICE
)
3076 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3077 "Requested dependency SliceOf=%s refused (%s is not a slice unit).", other
->id
, u
->id
);
3079 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && !UNIT_HAS_CGROUP_CONTEXT(u
))
3080 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3081 "Requested dependency Slice=%s refused (%s is not a cgroup unit).", other
->id
, u
->id
);
3083 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && !UNIT_HAS_CGROUP_CONTEXT(other
))
3084 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3085 "Requested dependency SliceOf=%s refused (%s is not a cgroup unit).", other
->id
, other
->id
);
3087 r
= unit_add_dependency_hashmap(&u
->dependencies
, d
, other
, mask
, 0);
3092 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
3093 r
= unit_add_dependency_hashmap(&other
->dependencies
, inverse_table
[d
], u
, 0, mask
);
3100 if (add_reference
) {
3101 r
= unit_add_dependency_hashmap(&u
->dependencies
, UNIT_REFERENCES
, other
, mask
, 0);
3107 r
= unit_add_dependency_hashmap(&other
->dependencies
, UNIT_REFERENCED_BY
, u
, 0, mask
);
3115 unit_add_to_dbus_queue(u
);
3120 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3125 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3129 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3132 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3140 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3147 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3149 _cleanup_free_
char *i
= NULL
;
3151 r
= unit_name_to_prefix(u
->id
, &i
);
3155 r
= unit_name_replace_instance(name
, i
, buf
);
3164 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3165 _cleanup_free_
char *buf
= NULL
;
3172 r
= resolve_template(u
, name
, &buf
, &name
);
3176 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3180 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3183 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3184 _cleanup_free_
char *buf
= NULL
;
3191 r
= resolve_template(u
, name
, &buf
, &name
);
3195 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3199 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3202 int set_unit_path(const char *p
) {
3203 /* This is mostly for debug purposes */
3204 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
3210 char *unit_dbus_path(Unit
*u
) {
3216 return unit_dbus_path_from_name(u
->id
);
3219 char *unit_dbus_path_invocation_id(Unit
*u
) {
3222 if (sd_id128_is_null(u
->invocation_id
))
3225 return unit_dbus_path_from_name(u
->invocation_id_string
);
3228 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3233 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3235 if (sd_id128_equal(u
->invocation_id
, id
))
3238 if (!sd_id128_is_null(u
->invocation_id
))
3239 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3241 if (sd_id128_is_null(id
)) {
3246 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3250 u
->invocation_id
= id
;
3251 sd_id128_to_string(id
, u
->invocation_id_string
);
3253 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3260 u
->invocation_id
= SD_ID128_NULL
;
3261 u
->invocation_id_string
[0] = 0;
3265 int unit_set_slice(Unit
*u
, Unit
*slice
, UnitDependencyMask mask
) {
3271 /* Sets the unit slice if it has not been set before. Is extra careful, to only allow this for units
3272 * that actually have a cgroup context. Also, we don't allow to set this for slices (since the parent
3273 * slice is derived from the name). Make sure the unit we set is actually a slice. */
3275 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3278 if (u
->type
== UNIT_SLICE
)
3281 if (unit_active_state(u
) != UNIT_INACTIVE
)
3284 if (slice
->type
!= UNIT_SLICE
)
3287 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3288 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3291 if (UNIT_GET_SLICE(u
) == slice
)
3294 /* Disallow slice changes if @u is already bound to cgroups */
3295 if (UNIT_GET_SLICE(u
) && u
->cgroup_realized
)
3298 r
= unit_add_dependency(u
, UNIT_IN_SLICE
, slice
, true, mask
);
3305 int unit_set_default_slice(Unit
*u
) {
3306 const char *slice_name
;
3312 if (UNIT_GET_SLICE(u
))
3316 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3318 /* Implicitly place all instantiated units in their
3319 * own per-template slice */
3321 r
= unit_name_to_prefix(u
->id
, &prefix
);
3325 /* The prefix is already escaped, but it might include
3326 * "-" which has a special meaning for slice units,
3327 * hence escape it here extra. */
3328 escaped
= unit_name_escape(prefix
);
3332 if (MANAGER_IS_SYSTEM(u
->manager
))
3333 slice_name
= strjoina("system-", escaped
, ".slice");
3335 slice_name
= strjoina("app-", escaped
, ".slice");
3337 } else if (unit_is_extrinsic(u
))
3338 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3339 * the root slice. They don't really belong in one of the subslices. */
3340 slice_name
= SPECIAL_ROOT_SLICE
;
3342 else if (MANAGER_IS_SYSTEM(u
->manager
))
3343 slice_name
= SPECIAL_SYSTEM_SLICE
;
3345 slice_name
= SPECIAL_APP_SLICE
;
3347 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3351 return unit_set_slice(u
, slice
, UNIT_DEPENDENCY_FILE
);
3354 const char *unit_slice_name(Unit
*u
) {
3358 slice
= UNIT_GET_SLICE(u
);
3365 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3366 _cleanup_free_
char *t
= NULL
;
3373 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3376 if (unit_has_name(u
, t
))
3379 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3380 assert(r
< 0 || *_found
!= u
);
3384 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3385 const char *new_owner
;
3392 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3394 bus_log_parse_error(r
);
3398 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3399 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3404 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3405 const sd_bus_error
*e
;
3406 const char *new_owner
;
3413 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3415 e
= sd_bus_message_get_error(message
);
3417 if (!sd_bus_error_has_name(e
, "org.freedesktop.DBus.Error.NameHasNoOwner"))
3418 log_unit_error(u
, "Unexpected error response from GetNameOwner(): %s", e
->message
);
3422 r
= sd_bus_message_read(message
, "s", &new_owner
);
3424 return bus_log_parse_error(r
);
3426 assert(!isempty(new_owner
));
3429 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3430 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3435 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3443 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3446 match
= strjoina("type='signal',"
3447 "sender='org.freedesktop.DBus',"
3448 "path='/org/freedesktop/DBus',"
3449 "interface='org.freedesktop.DBus',"
3450 "member='NameOwnerChanged',"
3451 "arg0='", name
, "'");
3453 r
= sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3457 r
= sd_bus_call_method_async(
3459 &u
->get_name_owner_slot
,
3460 "org.freedesktop.DBus",
3461 "/org/freedesktop/DBus",
3462 "org.freedesktop.DBus",
3464 get_name_owner_handler
,
3468 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3472 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3476 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3482 /* Watch a specific name on the bus. We only support one unit
3483 * watching each name for now. */
3485 if (u
->manager
->api_bus
) {
3486 /* If the bus is already available, install the match directly.
3487 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3488 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3490 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3493 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3495 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3496 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3497 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3503 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3507 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3508 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3509 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3512 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3513 _cleanup_free_
char *e
= NULL
;
3519 /* Adds in links to the device node that this unit is based on */
3523 if (!is_device_path(what
))
3526 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3527 if (!unit_type_supported(UNIT_DEVICE
))
3530 r
= unit_name_from_path(what
, ".device", &e
);
3534 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3538 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3539 dep
= UNIT_BINDS_TO
;
3541 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3542 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3543 device
, true, mask
);
3546 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3547 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3555 if (!path_startswith(what
, "/dev/"))
3558 /* If we don't support devices, then also don't bother with blockdev@.target */
3559 if (!unit_type_supported(UNIT_DEVICE
))
3562 r
= unit_name_path_escape(what
, &escaped
);
3566 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3570 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3573 int unit_coldplug(Unit
*u
) {
3580 /* Make sure we don't enter a loop, when coldplugging recursively. */
3584 u
->coldplugged
= true;
3586 STRV_FOREACH(i
, u
->deserialized_refs
) {
3587 q
= bus_unit_track_add_name(u
, *i
);
3588 if (q
< 0 && r
>= 0)
3591 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3593 if (UNIT_VTABLE(u
)->coldplug
) {
3594 q
= UNIT_VTABLE(u
)->coldplug(u
);
3595 if (q
< 0 && r
>= 0)
3599 uj
= u
->job
?: u
->nop_job
;
3601 q
= job_coldplug(uj
);
3602 if (q
< 0 && r
>= 0)
3609 void unit_catchup(Unit
*u
) {
3612 if (UNIT_VTABLE(u
)->catchup
)
3613 UNIT_VTABLE(u
)->catchup(u
);
3616 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3622 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3623 * are never out-of-date. */
3624 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3627 if (stat(path
, &st
) < 0)
3628 /* What, cannot access this anymore? */
3632 /* For masked files check if they are still so */
3633 return !null_or_empty(&st
);
3635 /* For non-empty files check the mtime */
3636 return timespec_load(&st
.st_mtim
) > mtime
;
3641 bool unit_need_daemon_reload(Unit
*u
) {
3642 _cleanup_strv_free_
char **t
= NULL
;
3647 /* For unit files, we allow masking… */
3648 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3649 u
->load_state
== UNIT_MASKED
))
3652 /* Source paths should not be masked… */
3653 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3656 if (u
->load_state
== UNIT_LOADED
)
3657 (void) unit_find_dropin_paths(u
, &t
);
3658 if (!strv_equal(u
->dropin_paths
, t
))
3661 /* … any drop-ins that are masked are simply omitted from the list. */
3662 STRV_FOREACH(path
, u
->dropin_paths
)
3663 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3669 void unit_reset_failed(Unit
*u
) {
3672 if (UNIT_VTABLE(u
)->reset_failed
)
3673 UNIT_VTABLE(u
)->reset_failed(u
);
3675 ratelimit_reset(&u
->start_ratelimit
);
3676 u
->start_limit_hit
= false;
3679 Unit
*unit_following(Unit
*u
) {
3682 if (UNIT_VTABLE(u
)->following
)
3683 return UNIT_VTABLE(u
)->following(u
);
3688 bool unit_stop_pending(Unit
*u
) {
3691 /* This call does check the current state of the unit. It's
3692 * hence useful to be called from state change calls of the
3693 * unit itself, where the state isn't updated yet. This is
3694 * different from unit_inactive_or_pending() which checks both
3695 * the current state and for a queued job. */
3697 return unit_has_job_type(u
, JOB_STOP
);
3700 bool unit_inactive_or_pending(Unit
*u
) {
3703 /* Returns true if the unit is inactive or going down */
3705 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3708 if (unit_stop_pending(u
))
3714 bool unit_active_or_pending(Unit
*u
) {
3717 /* Returns true if the unit is active or going up */
3719 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3723 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3729 bool unit_will_restart_default(Unit
*u
) {
3732 return unit_has_job_type(u
, JOB_START
);
3735 bool unit_will_restart(Unit
*u
) {
3738 if (!UNIT_VTABLE(u
)->will_restart
)
3741 return UNIT_VTABLE(u
)->will_restart(u
);
3744 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3746 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3747 assert(SIGNAL_VALID(signo
));
3749 if (!UNIT_VTABLE(u
)->kill
)
3752 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3755 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3756 _cleanup_set_free_ Set
*pid_set
= NULL
;
3759 pid_set
= set_new(NULL
);
3763 /* Exclude the main/control pids from being killed via the cgroup */
3765 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3770 if (control_pid
> 0) {
3771 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3776 return TAKE_PTR(pid_set
);
3779 static int kill_common_log(pid_t pid
, int signo
, void *userdata
) {
3780 _cleanup_free_
char *comm
= NULL
;
3785 (void) get_process_comm(pid
, &comm
);
3786 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
3787 signal_to_string(signo
), pid
, strna(comm
));
3792 int unit_kill_common(
3798 sd_bus_error
*error
) {
3801 bool killed
= false;
3803 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
3804 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
3805 * stop a service ourselves. */
3807 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3809 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3811 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3814 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3815 if (control_pid
< 0)
3816 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3817 if (control_pid
== 0)
3818 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3821 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3822 if (control_pid
> 0) {
3823 _cleanup_free_
char *comm
= NULL
;
3824 (void) get_process_comm(control_pid
, &comm
);
3826 if (kill(control_pid
, signo
) < 0) {
3827 /* Report this failure both to the logs and to the client */
3828 sd_bus_error_set_errnof(
3830 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
3831 signal_to_string(signo
), control_pid
, strna(comm
));
3832 r
= log_unit_warning_errno(
3834 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
3835 signal_to_string(signo
), control_pid
, strna(comm
));
3837 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
3838 signal_to_string(signo
), control_pid
, strna(comm
));
3843 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3845 _cleanup_free_
char *comm
= NULL
;
3846 (void) get_process_comm(main_pid
, &comm
);
3848 if (kill(main_pid
, signo
) < 0) {
3850 sd_bus_error_set_errnof(
3852 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
3853 signal_to_string(signo
), main_pid
, strna(comm
));
3855 r
= log_unit_warning_errno(
3857 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
3858 signal_to_string(signo
), main_pid
, strna(comm
));
3860 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
3861 signal_to_string(signo
), main_pid
, strna(comm
));
3866 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3867 _cleanup_set_free_ Set
*pid_set
= NULL
;
3870 /* Exclude the main/control pids from being killed via the cgroup */
3871 pid_set
= unit_pid_set(main_pid
, control_pid
);
3875 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
3877 if (!IN_SET(q
, -ESRCH
, -ENOENT
)) {
3879 sd_bus_error_set_errnof(
3881 "Failed to send signal SIG%s to auxiliary processes: %m",
3882 signal_to_string(signo
));
3884 r
= log_unit_warning_errno(
3886 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
3887 signal_to_string(signo
));
3893 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
3894 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
3895 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
3900 int unit_following_set(Unit
*u
, Set
**s
) {
3904 if (UNIT_VTABLE(u
)->following_set
)
3905 return UNIT_VTABLE(u
)->following_set(u
, s
);
3911 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3916 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3917 r
= unit_file_get_state(
3918 u
->manager
->unit_file_scope
,
3921 &u
->unit_file_state
);
3923 u
->unit_file_state
= UNIT_FILE_BAD
;
3926 return u
->unit_file_state
;
3929 int unit_get_unit_file_preset(Unit
*u
) {
3932 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3933 u
->unit_file_preset
= unit_file_query_preset(
3934 u
->manager
->unit_file_scope
,
3936 basename(u
->fragment_path
),
3939 return u
->unit_file_preset
;
3942 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
3948 unit_ref_unset(ref
);
3950 ref
->source
= source
;
3951 ref
->target
= target
;
3952 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
3956 void unit_ref_unset(UnitRef
*ref
) {
3962 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
3963 * be unreferenced now. */
3964 unit_add_to_gc_queue(ref
->target
);
3966 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
3967 ref
->source
= ref
->target
= NULL
;
3970 static int user_from_unit_name(Unit
*u
, char **ret
) {
3972 static const uint8_t hash_key
[] = {
3973 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
3974 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
3977 _cleanup_free_
char *n
= NULL
;
3980 r
= unit_name_to_prefix(u
->id
, &n
);
3984 if (valid_user_group_name(n
, 0)) {
3989 /* If we can't use the unit name as a user name, then let's hash it and use that */
3990 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
3996 int unit_patch_contexts(Unit
*u
) {
4003 /* Patch in the manager defaults into the exec and cgroup
4004 * contexts, _after_ the rest of the settings have been
4007 ec
= unit_get_exec_context(u
);
4009 /* This only copies in the ones that need memory */
4010 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
4011 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4012 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4017 if (MANAGER_IS_USER(u
->manager
) &&
4018 !ec
->working_directory
) {
4020 r
= get_home_dir(&ec
->working_directory
);
4024 /* Allow user services to run, even if the
4025 * home directory is missing */
4026 ec
->working_directory_missing_ok
= true;
4029 if (ec
->private_devices
)
4030 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4032 if (ec
->protect_kernel_modules
)
4033 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4035 if (ec
->protect_kernel_logs
)
4036 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4038 if (ec
->protect_clock
)
4039 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4041 if (ec
->dynamic_user
) {
4043 r
= user_from_unit_name(u
, &ec
->user
);
4049 ec
->group
= strdup(ec
->user
);
4054 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4055 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4058 ec
->private_tmp
= true;
4059 ec
->remove_ipc
= true;
4060 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4061 if (ec
->protect_home
== PROTECT_HOME_NO
)
4062 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4064 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4066 ec
->no_new_privileges
= true;
4067 ec
->restrict_suid_sgid
= true;
4071 cc
= unit_get_cgroup_context(u
);
4074 if (ec
->private_devices
&&
4075 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4076 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4078 if ((ec
->root_image
|| !LIST_IS_EMPTY(ec
->mount_images
)) &&
4079 (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
)) {
4082 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4083 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4084 r
= cgroup_add_device_allow(cc
, p
, "rw");
4088 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4089 r
= cgroup_add_device_allow(cc
, p
, "rwm");
4094 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4095 * Same for mapper and verity. */
4096 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4097 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4103 if (ec
->protect_clock
) {
4104 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4113 ExecContext
*unit_get_exec_context(const Unit
*u
) {
4120 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4124 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4127 KillContext
*unit_get_kill_context(Unit
*u
) {
4134 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4138 return (KillContext
*) ((uint8_t*) u
+ offset
);
4141 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4147 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4151 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4154 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4160 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4164 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4167 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4170 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4173 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4174 return u
->manager
->lookup_paths
.transient
;
4176 if (flags
& UNIT_PERSISTENT
)
4177 return u
->manager
->lookup_paths
.persistent_control
;
4179 if (flags
& UNIT_RUNTIME
)
4180 return u
->manager
->lookup_paths
.runtime_control
;
4185 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4191 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4192 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4193 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4194 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4195 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4198 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4199 ret
= specifier_escape(s
);
4206 if (flags
& UNIT_ESCAPE_C
) {
4219 return ret
?: (char*) s
;
4222 return ret
?: strdup(s
);
4225 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4226 _cleanup_free_
char *result
= NULL
;
4230 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4231 * way suitable for ExecStart= stanzas */
4233 STRV_FOREACH(i
, l
) {
4234 _cleanup_free_
char *buf
= NULL
;
4239 p
= unit_escape_setting(*i
, flags
, &buf
);
4243 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4244 if (!GREEDY_REALLOC(result
, n
+ a
+ 1))
4258 if (!GREEDY_REALLOC(result
, n
+ 1))
4263 return TAKE_PTR(result
);
4266 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4267 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4268 const char *dir
, *wrapped
;
4275 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4278 data
= unit_escape_setting(data
, flags
, &escaped
);
4282 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4283 * previous section header is the same */
4285 if (flags
& UNIT_PRIVATE
) {
4286 if (!UNIT_VTABLE(u
)->private_section
)
4289 if (!u
->transient_file
|| u
->last_section_private
< 0)
4290 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4291 else if (u
->last_section_private
== 0)
4292 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4294 if (!u
->transient_file
|| u
->last_section_private
< 0)
4295 data
= strjoina("[Unit]\n", data
);
4296 else if (u
->last_section_private
> 0)
4297 data
= strjoina("\n[Unit]\n", data
);
4300 if (u
->transient_file
) {
4301 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4302 * write to the transient unit file. */
4303 fputs(data
, u
->transient_file
);
4305 if (!endswith(data
, "\n"))
4306 fputc('\n', u
->transient_file
);
4308 /* Remember which section we wrote this entry to */
4309 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4313 dir
= unit_drop_in_dir(u
, flags
);
4317 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4318 "# or an equivalent operation. Do not edit.\n",
4322 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4326 (void) mkdir_p_label(p
, 0755);
4328 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4329 * recreate the cache after every drop-in we write. */
4330 if (u
->manager
->unit_path_cache
) {
4331 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4336 r
= write_string_file_atomic_label(q
, wrapped
);
4340 r
= strv_push(&u
->dropin_paths
, q
);
4345 strv_uniq(u
->dropin_paths
);
4347 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4352 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4353 _cleanup_free_
char *p
= NULL
;
4361 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4364 va_start(ap
, format
);
4365 r
= vasprintf(&p
, format
, ap
);
4371 return unit_write_setting(u
, flags
, name
, p
);
4374 int unit_make_transient(Unit
*u
) {
4375 _cleanup_free_
char *path
= NULL
;
4380 if (!UNIT_VTABLE(u
)->can_transient
)
4383 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4385 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4389 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4390 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4392 RUN_WITH_UMASK(0022) {
4393 f
= fopen(path
, "we");
4398 safe_fclose(u
->transient_file
);
4399 u
->transient_file
= f
;
4401 free_and_replace(u
->fragment_path
, path
);
4403 u
->source_path
= mfree(u
->source_path
);
4404 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4405 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4407 u
->load_state
= UNIT_STUB
;
4409 u
->transient
= true;
4411 unit_add_to_dbus_queue(u
);
4412 unit_add_to_gc_queue(u
);
4414 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4420 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4421 _cleanup_free_
char *comm
= NULL
;
4423 (void) get_process_comm(pid
, &comm
);
4425 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4426 only, like for example systemd's own PAM stub process. */
4427 if (comm
&& comm
[0] == '(')
4430 log_unit_notice(userdata
,
4431 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4434 signal_to_string(sig
));
4439 static int operation_to_signal(const KillContext
*c
, KillOperation k
, bool *noteworthy
) {
4444 case KILL_TERMINATE
:
4445 case KILL_TERMINATE_AND_LOG
:
4446 *noteworthy
= false;
4447 return c
->kill_signal
;
4450 *noteworthy
= false;
4451 return restart_kill_signal(c
);
4455 return c
->final_kill_signal
;
4459 return c
->watchdog_signal
;
4462 assert_not_reached("KillOperation unknown");
4466 int unit_kill_context(
4472 bool main_pid_alien
) {
4474 bool wait_for_exit
= false, send_sighup
;
4475 cg_kill_log_func_t log_func
= NULL
;
4481 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
4482 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
4483 * which is used for user-requested killing of unit processes. */
4485 if (c
->kill_mode
== KILL_NONE
)
4489 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4491 log_func
= log_kill
;
4495 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4500 log_func(main_pid
, sig
, u
);
4502 r
= kill_and_sigcont(main_pid
, sig
);
4503 if (r
< 0 && r
!= -ESRCH
) {
4504 _cleanup_free_
char *comm
= NULL
;
4505 (void) get_process_comm(main_pid
, &comm
);
4507 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4509 if (!main_pid_alien
)
4510 wait_for_exit
= true;
4512 if (r
!= -ESRCH
&& send_sighup
)
4513 (void) kill(main_pid
, SIGHUP
);
4517 if (control_pid
> 0) {
4519 log_func(control_pid
, sig
, u
);
4521 r
= kill_and_sigcont(control_pid
, sig
);
4522 if (r
< 0 && r
!= -ESRCH
) {
4523 _cleanup_free_
char *comm
= NULL
;
4524 (void) get_process_comm(control_pid
, &comm
);
4526 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4528 wait_for_exit
= true;
4530 if (r
!= -ESRCH
&& send_sighup
)
4531 (void) kill(control_pid
, SIGHUP
);
4535 if (u
->cgroup_path
&&
4536 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4537 _cleanup_set_free_ Set
*pid_set
= NULL
;
4539 /* Exclude the main/control pids from being killed via the cgroup */
4540 pid_set
= unit_pid_set(main_pid
, control_pid
);
4544 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4546 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4550 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4551 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
4555 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4556 * we are running in a container or if this is a delegation unit, simply because cgroup
4557 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4558 * of containers it can be confused easily by left-over directories in the cgroup — which
4559 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4560 * there we get proper events. Hence rely on them. */
4562 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4563 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4564 wait_for_exit
= true;
4569 pid_set
= unit_pid_set(main_pid
, control_pid
);
4573 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4582 return wait_for_exit
;
4585 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4591 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these
4592 * paths in the unit (from the path to the UnitDependencyInfo structure indicating how to the
4593 * dependency came to be). However, we build a prefix table for all possible prefixes so that new
4594 * appearing mount units can easily determine which units to make themselves a dependency of. */
4596 if (!path_is_absolute(path
))
4599 if (hashmap_contains(u
->requires_mounts_for
, path
)) /* Exit quickly if the path is already covered. */
4602 _cleanup_free_
char *p
= strdup(path
);
4606 /* Use the canonical form of the path as the stored key. We call path_is_normalized()
4607 * only after simplification, since path_is_normalized() rejects paths with '.'.
4608 * path_is_normalized() also verifies that the path fits in PATH_MAX. */
4609 path
= path_simplify(p
);
4611 if (!path_is_normalized(path
))
4614 UnitDependencyInfo di
= {
4618 r
= hashmap_ensure_put(&u
->requires_mounts_for
, &path_hash_ops
, p
, di
.data
);
4622 TAKE_PTR(p
); /* path remains a valid pointer to the string stored in the hashmap */
4624 char prefix
[strlen(path
) + 1];
4625 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4628 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4630 _cleanup_free_
char *q
= NULL
;
4632 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4644 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4660 int unit_setup_exec_runtime(Unit
*u
) {
4666 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4669 /* Check if there already is an ExecRuntime for this unit? */
4670 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4674 /* Try to get it from somebody else */
4675 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_JOINS_NAMESPACE_OF
) {
4676 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4681 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4684 int unit_setup_dynamic_creds(Unit
*u
) {
4686 DynamicCreds
*dcreds
;
4691 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4693 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4695 ec
= unit_get_exec_context(u
);
4698 if (!ec
->dynamic_user
)
4701 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4704 bool unit_type_supported(UnitType t
) {
4705 if (_unlikely_(t
< 0))
4707 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4710 if (!unit_vtable
[t
]->supported
)
4713 return unit_vtable
[t
]->supported();
4716 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4722 if (!unit_log_level_test(u
, LOG_NOTICE
))
4725 r
= dir_is_empty(where
);
4726 if (r
> 0 || r
== -ENOTDIR
)
4729 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4733 log_unit_struct(u
, LOG_NOTICE
,
4734 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4735 LOG_UNIT_INVOCATION_ID(u
),
4736 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4740 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4741 _cleanup_free_
char *canonical_where
= NULL
;
4747 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
4749 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4753 /* We will happily ignore a trailing slash (or any redundant slashes) */
4754 if (path_equal(where
, canonical_where
))
4757 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4758 log_unit_struct(u
, LOG_ERR
,
4759 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4760 LOG_UNIT_INVOCATION_ID(u
),
4761 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4767 bool unit_is_pristine(Unit
*u
) {
4770 /* Check if the unit already exists or is already around,
4771 * in a number of different ways. Note that to cater for unit
4772 * types such as slice, we are generally fine with units that
4773 * are marked UNIT_LOADED even though nothing was actually
4774 * loaded, as those unit types don't require a file on disk. */
4776 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4779 !strv_isempty(u
->dropin_paths
) ||
4784 pid_t
unit_control_pid(Unit
*u
) {
4787 if (UNIT_VTABLE(u
)->control_pid
)
4788 return UNIT_VTABLE(u
)->control_pid(u
);
4793 pid_t
unit_main_pid(Unit
*u
) {
4796 if (UNIT_VTABLE(u
)->main_pid
)
4797 return UNIT_VTABLE(u
)->main_pid(u
);
4802 static void unit_unref_uid_internal(
4806 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4810 assert(_manager_unref_uid
);
4812 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4813 * gid_t are actually the same time, with the same validity rules.
4815 * Drops a reference to UID/GID from a unit. */
4817 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4818 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4820 if (!uid_is_valid(*ref_uid
))
4823 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4824 *ref_uid
= UID_INVALID
;
4827 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4828 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4831 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4832 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4835 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4838 unit_unref_uid(u
, destroy_now
);
4839 unit_unref_gid(u
, destroy_now
);
4842 static int unit_ref_uid_internal(
4847 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4853 assert(uid_is_valid(uid
));
4854 assert(_manager_ref_uid
);
4856 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4857 * are actually the same type, and have the same validity rules.
4859 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4860 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4863 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4864 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4866 if (*ref_uid
== uid
)
4869 if (uid_is_valid(*ref_uid
)) /* Already set? */
4872 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4880 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4881 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4884 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4885 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4888 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4893 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4895 if (uid_is_valid(uid
)) {
4896 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4901 if (gid_is_valid(gid
)) {
4902 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4905 unit_unref_uid(u
, false);
4911 return r
> 0 || q
> 0;
4914 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4920 c
= unit_get_exec_context(u
);
4922 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4924 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4929 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4934 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4935 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4936 * objects when no service references the UID/GID anymore. */
4938 r
= unit_ref_uid_gid(u
, uid
, gid
);
4940 unit_add_to_dbus_queue(u
);
4943 int unit_acquire_invocation_id(Unit
*u
) {
4949 r
= sd_id128_randomize(&id
);
4951 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
4953 r
= unit_set_invocation_id(u
, id
);
4955 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
4957 unit_add_to_dbus_queue(u
);
4961 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
4967 /* Copy parameters from manager */
4968 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
4972 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
4973 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
4974 p
->prefix
= u
->manager
->prefix
;
4975 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
4977 /* Copy parameters from unit */
4978 p
->cgroup_path
= u
->cgroup_path
;
4979 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
4981 p
->received_credentials
= u
->manager
->received_credentials
;
4986 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
4992 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
4993 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
4995 (void) unit_realize_cgroup(u
);
4997 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5001 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
);
5002 (void) ignore_signals(SIGPIPE
);
5004 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5006 if (u
->cgroup_path
) {
5007 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5009 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", u
->cgroup_path
);
5017 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5024 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5028 int ret
= EXIT_SUCCESS
;
5031 STRV_FOREACH(i
, paths
) {
5032 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5034 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5042 r
= unit_watch_pid(u
, pid
, true);
5050 static void unit_update_dependency_mask(Hashmap
*deps
, Unit
*other
, UnitDependencyInfo di
) {
5054 if (di
.origin_mask
== 0 && di
.destination_mask
== 0)
5055 /* No bit set anymore, let's drop the whole entry */
5056 assert_se(hashmap_remove(deps
, other
));
5058 /* Mask was reduced, let's update the entry */
5059 assert_se(hashmap_update(deps
, other
, di
.data
) == 0);
5062 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5066 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5071 HASHMAP_FOREACH(deps
, u
->dependencies
) {
5075 UnitDependencyInfo di
;
5080 HASHMAP_FOREACH_KEY(di
.data
, other
, deps
) {
5081 Hashmap
*other_deps
;
5083 if (FLAGS_SET(~mask
, di
.origin_mask
))
5086 di
.origin_mask
&= ~mask
;
5087 unit_update_dependency_mask(deps
, other
, di
);
5089 /* We updated the dependency from our unit to the other unit now. But most
5090 * dependencies imply a reverse dependency. Hence, let's delete that one
5091 * too. For that we go through all dependency types on the other unit and
5092 * delete all those which point to us and have the right mask set. */
5094 HASHMAP_FOREACH(other_deps
, other
->dependencies
) {
5095 UnitDependencyInfo dj
;
5097 dj
.data
= hashmap_get(other_deps
, u
);
5098 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5101 dj
.destination_mask
&= ~mask
;
5102 unit_update_dependency_mask(other_deps
, u
, dj
);
5105 unit_add_to_gc_queue(other
);
5115 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5122 if (MANAGER_IS_SYSTEM(u
->manager
))
5123 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5125 _cleanup_free_
char *user_path
= NULL
;
5126 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5129 p
= strjoin(user_path
, u
->id
);
5139 static int unit_export_invocation_id(Unit
*u
) {
5140 _cleanup_free_
char *p
= NULL
;
5145 if (u
->exported_invocation_id
)
5148 if (sd_id128_is_null(u
->invocation_id
))
5151 r
= unit_get_invocation_path(u
, &p
);
5153 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5155 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5157 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5159 u
->exported_invocation_id
= true;
5163 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5171 if (u
->exported_log_level_max
)
5174 if (c
->log_level_max
< 0)
5177 assert(c
->log_level_max
<= 7);
5179 buf
[0] = '0' + c
->log_level_max
;
5182 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5183 r
= symlink_atomic(buf
, p
);
5185 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5187 u
->exported_log_level_max
= true;
5191 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5192 _cleanup_close_
int fd
= -1;
5193 struct iovec
*iovec
;
5200 if (u
->exported_log_extra_fields
)
5203 if (c
->n_log_extra_fields
<= 0)
5206 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5207 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5209 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5210 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5212 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5213 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5216 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5217 pattern
= strjoina(p
, ".XXXXXX");
5219 fd
= mkostemp_safe(pattern
);
5221 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5223 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5225 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5229 (void) fchmod(fd
, 0644);
5231 if (rename(pattern
, p
) < 0) {
5232 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5236 u
->exported_log_extra_fields
= true;
5240 (void) unlink(pattern
);
5244 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5245 _cleanup_free_
char *buf
= NULL
;
5252 if (u
->exported_log_ratelimit_interval
)
5255 if (c
->log_ratelimit_interval_usec
== 0)
5258 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5260 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5263 r
= symlink_atomic(buf
, p
);
5265 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5267 u
->exported_log_ratelimit_interval
= true;
5271 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5272 _cleanup_free_
char *buf
= NULL
;
5279 if (u
->exported_log_ratelimit_burst
)
5282 if (c
->log_ratelimit_burst
== 0)
5285 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5287 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5290 r
= symlink_atomic(buf
, p
);
5292 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5294 u
->exported_log_ratelimit_burst
= true;
5298 void unit_export_state_files(Unit
*u
) {
5299 const ExecContext
*c
;
5306 if (MANAGER_IS_TEST_RUN(u
->manager
))
5309 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5310 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5311 * the IPC system itself and PID 1 also log to the journal.
5313 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5314 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5315 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5316 * namespace at least.
5318 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5319 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5322 (void) unit_export_invocation_id(u
);
5324 if (!MANAGER_IS_SYSTEM(u
->manager
))
5327 c
= unit_get_exec_context(u
);
5329 (void) unit_export_log_level_max(u
, c
);
5330 (void) unit_export_log_extra_fields(u
, c
);
5331 (void) unit_export_log_ratelimit_interval(u
, c
);
5332 (void) unit_export_log_ratelimit_burst(u
, c
);
5336 void unit_unlink_state_files(Unit
*u
) {
5344 /* Undoes the effect of unit_export_state() */
5346 if (u
->exported_invocation_id
) {
5347 _cleanup_free_
char *invocation_path
= NULL
;
5348 int r
= unit_get_invocation_path(u
, &invocation_path
);
5350 (void) unlink(invocation_path
);
5351 u
->exported_invocation_id
= false;
5355 if (!MANAGER_IS_SYSTEM(u
->manager
))
5358 if (u
->exported_log_level_max
) {
5359 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5362 u
->exported_log_level_max
= false;
5365 if (u
->exported_log_extra_fields
) {
5366 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5369 u
->exported_log_extra_fields
= false;
5372 if (u
->exported_log_ratelimit_interval
) {
5373 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5376 u
->exported_log_ratelimit_interval
= false;
5379 if (u
->exported_log_ratelimit_burst
) {
5380 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5383 u
->exported_log_ratelimit_burst
= false;
5387 int unit_prepare_exec(Unit
*u
) {
5392 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5393 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5394 r
= bpf_firewall_load_custom(u
);
5398 /* Prepares everything so that we can fork of a process for this unit */
5400 (void) unit_realize_cgroup(u
);
5402 if (u
->reset_accounting
) {
5403 (void) unit_reset_accounting(u
);
5404 u
->reset_accounting
= false;
5407 unit_export_state_files(u
);
5409 r
= unit_setup_exec_runtime(u
);
5413 r
= unit_setup_dynamic_creds(u
);
5420 static bool ignore_leftover_process(const char *comm
) {
5421 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5424 int unit_log_leftover_process_start(pid_t pid
, int sig
, void *userdata
) {
5425 _cleanup_free_
char *comm
= NULL
;
5427 (void) get_process_comm(pid
, &comm
);
5429 if (ignore_leftover_process(comm
))
5432 /* During start we print a warning */
5434 log_unit_warning(userdata
,
5435 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5436 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5442 int unit_log_leftover_process_stop(pid_t pid
, int sig
, void *userdata
) {
5443 _cleanup_free_
char *comm
= NULL
;
5445 (void) get_process_comm(pid
, &comm
);
5447 if (ignore_leftover_process(comm
))
5450 /* During stop we only print an informational message */
5452 log_unit_info(userdata
,
5453 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
5459 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
5462 (void) unit_pick_cgroup_path(u
);
5464 if (!u
->cgroup_path
)
5467 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_func
, u
);
5470 bool unit_needs_console(Unit
*u
) {
5472 UnitActiveState state
;
5476 state
= unit_active_state(u
);
5478 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5481 if (UNIT_VTABLE(u
)->needs_console
)
5482 return UNIT_VTABLE(u
)->needs_console(u
);
5484 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5485 ec
= unit_get_exec_context(u
);
5489 return exec_context_may_touch_console(ec
);
5492 const char *unit_label_path(const Unit
*u
) {
5497 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
5498 * when validating access checks. */
5500 p
= u
->source_path
?: u
->fragment_path
;
5504 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
5505 if (null_or_empty_path(p
) > 0)
5511 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5516 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5517 * and not a kernel thread either */
5519 /* First, a simple range check */
5520 if (!pid_is_valid(pid
))
5521 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5523 /* Some extra safety check */
5524 if (pid
== 1 || pid
== getpid_cached())
5525 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5527 /* Don't even begin to bother with kernel threads */
5528 r
= is_kernel_thread(pid
);
5530 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5532 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5534 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5539 void unit_log_success(Unit
*u
) {
5542 /* Let's show message "Deactivated successfully" in debug mode (when manager is user) rather than in info mode.
5543 * This message has low information value for regular users and it might be a bit overwhelming on a system with
5544 * a lot of devices. */
5546 MANAGER_IS_USER(u
->manager
) ? LOG_DEBUG
: LOG_INFO
,
5547 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5548 LOG_UNIT_INVOCATION_ID(u
),
5549 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
5552 void unit_log_failure(Unit
*u
, const char *result
) {
5556 log_unit_struct(u
, LOG_WARNING
,
5557 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5558 LOG_UNIT_INVOCATION_ID(u
),
5559 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5560 "UNIT_RESULT=%s", result
);
5563 void unit_log_skip(Unit
*u
, const char *result
) {
5567 log_unit_struct(u
, LOG_INFO
,
5568 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5569 LOG_UNIT_INVOCATION_ID(u
),
5570 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5571 "UNIT_RESULT=%s", result
);
5574 void unit_log_process_exit(
5577 const char *command
,
5587 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5588 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5589 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5593 else if (code
== CLD_EXITED
)
5596 level
= LOG_WARNING
;
5598 log_unit_struct(u
, level
,
5599 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5600 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s%s",
5602 sigchld_code_to_string(code
), status
,
5603 strna(code
== CLD_EXITED
5604 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5605 : signal_to_string(status
)),
5606 success
? " (success)" : ""),
5607 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5608 "EXIT_STATUS=%i", status
,
5609 "COMMAND=%s", strna(command
),
5610 LOG_UNIT_INVOCATION_ID(u
));
5613 int unit_exit_status(Unit
*u
) {
5616 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5617 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5618 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5619 * service process has exited abnormally (signal/coredump). */
5621 if (!UNIT_VTABLE(u
)->exit_status
)
5624 return UNIT_VTABLE(u
)->exit_status(u
);
5627 int unit_failure_action_exit_status(Unit
*u
) {
5632 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5634 if (u
->failure_action_exit_status
>= 0)
5635 return u
->failure_action_exit_status
;
5637 r
= unit_exit_status(u
);
5638 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5644 int unit_success_action_exit_status(Unit
*u
) {
5649 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5651 if (u
->success_action_exit_status
>= 0)
5652 return u
->success_action_exit_status
;
5654 r
= unit_exit_status(u
);
5655 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5661 int unit_test_trigger_loaded(Unit
*u
) {
5664 /* Tests whether the unit to trigger is loaded */
5666 trigger
= UNIT_TRIGGER(u
);
5668 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5669 "Refusing to start, no unit to trigger.");
5670 if (trigger
->load_state
!= UNIT_LOADED
)
5671 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5672 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
5677 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
5681 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
||
5682 (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
&& !unit_will_restart(u
)))
5683 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
5685 exec_context_destroy_credentials(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], u
->id
);
5688 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
5689 UnitActiveState state
;
5693 /* Special return values:
5695 * -EOPNOTSUPP → cleaning not supported for this unit type
5696 * -EUNATCH → cleaning not defined for this resource type
5697 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
5698 * a job queued or similar
5701 if (!UNIT_VTABLE(u
)->clean
)
5707 if (u
->load_state
!= UNIT_LOADED
)
5713 state
= unit_active_state(u
);
5714 if (!IN_SET(state
, UNIT_INACTIVE
))
5717 return UNIT_VTABLE(u
)->clean(u
, mask
);
5720 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
5723 if (!UNIT_VTABLE(u
)->clean
||
5724 u
->load_state
!= UNIT_LOADED
) {
5729 /* When the clean() method is set, can_clean() really should be set too */
5730 assert(UNIT_VTABLE(u
)->can_clean
);
5732 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
5735 bool unit_can_freeze(Unit
*u
) {
5738 if (UNIT_VTABLE(u
)->can_freeze
)
5739 return UNIT_VTABLE(u
)->can_freeze(u
);
5741 return UNIT_VTABLE(u
)->freeze
;
5744 void unit_frozen(Unit
*u
) {
5747 u
->freezer_state
= FREEZER_FROZEN
;
5749 bus_unit_send_pending_freezer_message(u
);
5752 void unit_thawed(Unit
*u
) {
5755 u
->freezer_state
= FREEZER_RUNNING
;
5757 bus_unit_send_pending_freezer_message(u
);
5760 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
5762 int (*method
)(Unit
*);
5766 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
5768 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
5769 if (!method
|| !cg_freezer_supported())
5775 if (u
->load_state
!= UNIT_LOADED
)
5778 s
= unit_active_state(u
);
5779 if (s
!= UNIT_ACTIVE
)
5782 if (IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
))
5792 int unit_freeze(Unit
*u
) {
5793 return unit_freezer_action(u
, FREEZER_FREEZE
);
5796 int unit_thaw(Unit
*u
) {
5797 return unit_freezer_action(u
, FREEZER_THAW
);
5800 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
5801 int unit_freeze_vtable_common(Unit
*u
) {
5802 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
5805 int unit_thaw_vtable_common(Unit
*u
) {
5806 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
5809 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5810 [COLLECT_INACTIVE
] = "inactive",
5811 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5814 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);
5816 Unit
* unit_has_dependency(const Unit
*u
, UnitDependencyAtom atom
, Unit
*other
) {
5821 /* Checks if the unit has a dependency on 'other' with the specified dependency atom. If 'other' is
5822 * NULL checks if the unit has *any* dependency of that atom. Returns 'other' if found (or if 'other'
5823 * is NULL the first entry found), or NULL if not found. */
5825 UNIT_FOREACH_DEPENDENCY(i
, u
, atom
)
5826 if (!other
|| other
== i
)
5832 int unit_get_dependency_array(const Unit
*u
, UnitDependencyAtom atom
, Unit
***ret_array
) {
5833 _cleanup_free_ Unit
**array
= NULL
;
5840 /* Gets a list of units matching a specific atom as array. This is useful when iterating through
5841 * dependencies while modifying them: the array is an "atomic snapshot" of sorts, that can be read
5842 * while the dependency table is continuously updated. */
5844 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
5845 if (!GREEDY_REALLOC(array
, n
+ 1))
5851 *ret_array
= TAKE_PTR(array
);
5853 assert(n
<= INT_MAX
);