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();
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", empty_to_root(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
);
736 if (u
->in_cleanup_queue
)
737 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
740 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
742 if (u
->in_cgroup_realize_queue
)
743 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
745 if (u
->in_cgroup_empty_queue
)
746 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
748 if (u
->in_cgroup_oom_queue
)
749 LIST_REMOVE(cgroup_oom_queue
, u
->manager
->cgroup_oom_queue
, u
);
751 if (u
->in_target_deps_queue
)
752 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
754 if (u
->in_stop_when_unneeded_queue
)
755 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
757 if (u
->in_start_when_upheld_queue
)
758 LIST_REMOVE(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
760 if (u
->in_stop_when_bound_queue
)
761 LIST_REMOVE(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
763 bpf_firewall_close(u
);
765 hashmap_free(u
->bpf_foreign_by_key
);
767 bpf_program_unref(u
->bpf_device_control_installed
);
769 condition_free_list(u
->conditions
);
770 condition_free_list(u
->asserts
);
772 free(u
->description
);
773 strv_free(u
->documentation
);
774 free(u
->fragment_path
);
775 free(u
->source_path
);
776 strv_free(u
->dropin_paths
);
779 free(u
->job_timeout_reboot_arg
);
782 set_free_free(u
->aliases
);
788 FreezerState
unit_freezer_state(Unit
*u
) {
791 return u
->freezer_state
;
794 int unit_freezer_state_kernel(Unit
*u
, FreezerState
*ret
) {
795 char *values
[1] = {};
800 r
= cg_get_keyed_attribute(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events",
801 STRV_MAKE("frozen"), values
);
805 r
= _FREEZER_STATE_INVALID
;
808 if (streq(values
[0], "0"))
810 else if (streq(values
[0], "1"))
820 UnitActiveState
unit_active_state(Unit
*u
) {
823 if (u
->load_state
== UNIT_MERGED
)
824 return unit_active_state(unit_follow_merge(u
));
826 /* After a reload it might happen that a unit is not correctly
827 * loaded but still has a process around. That's why we won't
828 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
830 return UNIT_VTABLE(u
)->active_state(u
);
833 const char* unit_sub_state_to_string(Unit
*u
) {
836 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
839 static int unit_merge_names(Unit
*u
, Unit
*other
) {
846 r
= unit_add_alias(u
, other
->id
);
850 r
= set_move(u
->aliases
, other
->aliases
);
852 set_remove(u
->aliases
, other
->id
);
857 other
->aliases
= set_free_free(other
->aliases
);
859 SET_FOREACH(name
, u
->aliases
)
860 assert_se(hashmap_replace(u
->manager
->units
, name
, u
) == 0);
865 static int unit_reserve_dependencies(Unit
*u
, Unit
*other
) {
874 /* Let's reserve some space in the dependency hashmaps so that later on merging the units cannot
877 * First make some room in the per dependency type hashmaps. Using the summed size of both unit's
878 * hashmaps is an estimate that is likely too high since they probably use some of the same
879 * types. But it's never too low, and that's all we need. */
881 n_reserve
= MIN(hashmap_size(other
->dependencies
), LESS_BY((size_t) _UNIT_DEPENDENCY_MAX
, hashmap_size(u
->dependencies
)));
883 r
= hashmap_ensure_allocated(&u
->dependencies
, NULL
);
887 r
= hashmap_reserve(u
->dependencies
, n_reserve
);
892 /* Now, enlarge our per dependency type hashmaps by the number of entries in the same hashmap of the
893 * other unit's dependencies.
895 * NB: If u does not have a dependency set allocated for some dependency type, there is no need to
896 * reserve anything for. In that case other's set will be transferred as a whole to u by
897 * complete_move(). */
899 HASHMAP_FOREACH_KEY(deps
, d
, u
->dependencies
) {
902 other_deps
= hashmap_get(other
->dependencies
, d
);
904 r
= hashmap_reserve(deps
, hashmap_size(other_deps
));
912 static void unit_maybe_warn_about_dependency(
914 const char *other_id
,
915 UnitDependency dependency
) {
919 /* Only warn about some unit types */
920 if (!IN_SET(dependency
,
931 if (streq_ptr(u
->id
, other_id
))
932 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
934 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other_id
), u
->id
);
937 static int unit_per_dependency_type_hashmap_update(
940 UnitDependencyMask origin_mask
,
941 UnitDependencyMask destination_mask
) {
943 UnitDependencyInfo info
;
947 assert_cc(sizeof(void*) == sizeof(info
));
949 /* Acquire the UnitDependencyInfo entry for the Unit* we are interested in, and update it if it
950 * exists, or insert it anew if not. */
952 info
.data
= hashmap_get(per_type
, other
);
954 /* Entry already exists. Add in our mask. */
956 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
957 FLAGS_SET(destination_mask
, info
.destination_mask
))
960 info
.origin_mask
|= origin_mask
;
961 info
.destination_mask
|= destination_mask
;
963 r
= hashmap_update(per_type
, other
, info
.data
);
965 info
= (UnitDependencyInfo
) {
966 .origin_mask
= origin_mask
,
967 .destination_mask
= destination_mask
,
970 r
= hashmap_put(per_type
, other
, info
.data
);
979 static int unit_add_dependency_hashmap(
980 Hashmap
**dependencies
,
983 UnitDependencyMask origin_mask
,
984 UnitDependencyMask destination_mask
) {
989 assert(dependencies
);
991 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
992 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
993 assert(origin_mask
> 0 || destination_mask
> 0);
995 /* Ensure the top-level dependency hashmap exists that maps UnitDependency → Hashmap(Unit* →
996 * UnitDependencyInfo) */
997 r
= hashmap_ensure_allocated(dependencies
, NULL
);
1001 /* Acquire the inner hashmap, that maps Unit* → UnitDependencyInfo, for the specified dependency
1002 * type, and if it's missing allocate it and insert it. */
1003 per_type
= hashmap_get(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
));
1005 per_type
= hashmap_new(NULL
);
1009 r
= hashmap_put(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
), per_type
);
1011 hashmap_free(per_type
);
1016 return unit_per_dependency_type_hashmap_update(per_type
, other
, origin_mask
, destination_mask
);
1019 static void unit_merge_dependencies(
1032 _cleanup_(hashmap_freep
) Hashmap
*other_deps
= NULL
;
1033 UnitDependencyInfo di_back
;
1035 void *dt
; /* Actually of type UnitDependency, except that we don't bother casting it here,
1036 * since the hashmaps all want it as void pointer. */
1038 /* Let's focus on one dependency type at a time, that 'other' has defined. */
1039 other_deps
= hashmap_steal_first_key_and_value(other
->dependencies
, &dt
);
1043 /* Now iterate through all dependencies of this dependency type, of 'other'. We refer to the
1044 * referenced units as 'back'. */
1045 HASHMAP_FOREACH_KEY(di_back
.data
, back
, other_deps
) {
1050 /* This is a dependency pointing back to the unit we want to merge with?
1051 * Suppress it (but warn) */
1052 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1056 /* Now iterate through all deps of 'back', and fix the ones pointing to 'other' to
1057 * point to 'u' instead. */
1058 HASHMAP_FOREACH_KEY(back_deps
, back_dt
, back
->dependencies
) {
1059 UnitDependencyInfo di_move
;
1061 di_move
.data
= hashmap_remove(back_deps
, other
);
1065 assert_se(unit_per_dependency_type_hashmap_update(
1068 di_move
.origin_mask
,
1069 di_move
.destination_mask
) >= 0);
1073 /* Now all references towards 'other' of the current type 'dt' are corrected to point to
1074 * 'u'. Lets's now move the deps of type 'dt' from 'other' to 'u'. First, let's try to move
1075 * them per type wholesale. */
1076 r
= hashmap_put(u
->dependencies
, dt
, other_deps
);
1080 /* The target unit already has dependencies of this type, let's then merge this individually. */
1082 assert_se(deps
= hashmap_get(u
->dependencies
, dt
));
1085 UnitDependencyInfo di_move
;
1088 di_move
.data
= hashmap_steal_first_key_and_value(other_deps
, (void**) &back
);
1092 /* Would point back to us, ignore */
1093 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1097 assert_se(unit_per_dependency_type_hashmap_update(deps
, back
, di_move
.origin_mask
, di_move
.destination_mask
) >= 0);
1101 TAKE_PTR(other_deps
);
1103 if (hashmap_remove(other_deps
, u
))
1104 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1108 other
->dependencies
= hashmap_free(other
->dependencies
);
1111 int unit_merge(Unit
*u
, Unit
*other
) {
1116 assert(u
->manager
== other
->manager
);
1117 assert(u
->type
!= _UNIT_TYPE_INVALID
);
1119 other
= unit_follow_merge(other
);
1124 if (u
->type
!= other
->type
)
1127 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
1130 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
1133 if (!streq_ptr(u
->instance
, other
->instance
))
1142 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1145 /* Make reservations to ensure merge_dependencies() won't fail. We don't rollback reservations if we
1146 * fail. We don't have a way to undo reservations. A reservation is not a leak. */
1147 r
= unit_reserve_dependencies(u
, other
);
1152 r
= unit_merge_names(u
, other
);
1156 /* Redirect all references */
1157 while (other
->refs_by_target
)
1158 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
1160 /* Merge dependencies */
1161 unit_merge_dependencies(u
, other
);
1163 other
->load_state
= UNIT_MERGED
;
1164 other
->merged_into
= u
;
1166 /* If there is still some data attached to the other node, we
1167 * don't need it anymore, and can free it. */
1168 if (other
->load_state
!= UNIT_STUB
)
1169 if (UNIT_VTABLE(other
)->done
)
1170 UNIT_VTABLE(other
)->done(other
);
1172 unit_add_to_dbus_queue(u
);
1173 unit_add_to_cleanup_queue(other
);
1178 int unit_merge_by_name(Unit
*u
, const char *name
) {
1179 _cleanup_free_
char *s
= NULL
;
1183 /* Either add name to u, or if a unit with name already exists, merge it with u.
1184 * If name is a template, do the same for name@instance, where instance is u's instance. */
1189 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
1193 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
1200 other
= manager_get_unit(u
->manager
, name
);
1202 return unit_merge(u
, other
);
1204 return unit_add_name(u
, name
);
1207 Unit
* unit_follow_merge(Unit
*u
) {
1210 while (u
->load_state
== UNIT_MERGED
)
1211 assert_se(u
= u
->merged_into
);
1216 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
1222 if (c
->working_directory
&& !c
->working_directory_missing_ok
) {
1223 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
1228 if (c
->root_directory
) {
1229 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
1234 if (c
->root_image
) {
1235 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
1240 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
1241 if (!u
->manager
->prefix
[dt
])
1245 STRV_FOREACH(dp
, c
->directories
[dt
].paths
) {
1246 _cleanup_free_
char *p
= NULL
;
1248 p
= path_join(u
->manager
->prefix
[dt
], *dp
);
1252 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1258 if (!MANAGER_IS_SYSTEM(u
->manager
))
1261 /* For the following three directory types we need write access, and /var/ is possibly on the root
1262 * fs. Hence order after systemd-remount-fs.service, to ensure things are writable. */
1263 if (!strv_isempty(c
->directories
[EXEC_DIRECTORY_STATE
].paths
) ||
1264 !strv_isempty(c
->directories
[EXEC_DIRECTORY_CACHE
].paths
) ||
1265 !strv_isempty(c
->directories
[EXEC_DIRECTORY_LOGS
].paths
)) {
1266 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_REMOUNT_FS_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1271 if (c
->private_tmp
) {
1273 /* FIXME: for now we make a special case for /tmp and add a weak dependency on
1274 * tmp.mount so /tmp being masked is supported. However there's no reason to treat
1275 * /tmp specifically and masking other mount units should be handled more
1276 * gracefully too, see PR#16894. */
1277 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "tmp.mount", true, UNIT_DEPENDENCY_FILE
);
1281 r
= unit_require_mounts_for(u
, "/var/tmp", UNIT_DEPENDENCY_FILE
);
1285 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1290 if (c
->root_image
) {
1291 /* We need to wait for /dev/loopX to appear when doing RootImage=, hence let's add an
1292 * implicit dependency on udev */
1294 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_UDEVD_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1299 if (!IN_SET(c
->std_output
,
1300 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1301 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1302 !IN_SET(c
->std_error
,
1303 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1304 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1308 /* If syslog or kernel logging is requested (or log namespacing is), make sure our own logging daemon
1311 if (c
->log_namespace
) {
1312 _cleanup_free_
char *socket_unit
= NULL
, *varlink_socket_unit
= NULL
;
1314 r
= unit_name_build_from_type("systemd-journald", c
->log_namespace
, UNIT_SOCKET
, &socket_unit
);
1318 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1322 r
= unit_name_build_from_type("systemd-journald-varlink", c
->log_namespace
, UNIT_SOCKET
, &varlink_socket_unit
);
1326 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, varlink_socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1330 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1337 const char* unit_description(Unit
*u
) {
1341 return u
->description
;
1343 return strna(u
->id
);
1346 const char* unit_status_string(Unit
*u
, char **ret_combined_buffer
) {
1350 /* Return u->id, u->description, or "{u->id} - {u->description}".
1351 * Versions with u->description are only used if it is set.
1352 * The last option is used if configured and the caller provided the 'ret_combined_buffer'
1355 * Note that *ret_combined_buffer may be set to NULL. */
1357 if (!u
->description
||
1358 u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
||
1359 (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& !ret_combined_buffer
) ||
1360 streq(u
->description
, u
->id
)) {
1362 if (ret_combined_buffer
)
1363 *ret_combined_buffer
= NULL
;
1367 if (ret_combined_buffer
) {
1368 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
) {
1369 *ret_combined_buffer
= strjoin(u
->id
, " - ", u
->description
);
1370 if (*ret_combined_buffer
)
1371 return *ret_combined_buffer
;
1372 log_oom(); /* Fall back to ->description */
1374 *ret_combined_buffer
= NULL
;
1377 return u
->description
;
1380 /* Common implementation for multiple backends */
1381 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1386 /* Load a .{service,socket,...} file */
1387 r
= unit_load_fragment(u
);
1391 if (u
->load_state
== UNIT_STUB
) {
1392 if (fragment_required
)
1395 u
->load_state
= UNIT_LOADED
;
1398 /* Load drop-in directory data. If u is an alias, we might be reloading the
1399 * target unit needlessly. But we cannot be sure which drops-ins have already
1400 * been loaded and which not, at least without doing complicated book-keeping,
1401 * so let's always reread all drop-ins. */
1402 r
= unit_load_dropin(unit_follow_merge(u
));
1406 if (u
->source_path
) {
1409 if (stat(u
->source_path
, &st
) >= 0)
1410 u
->source_mtime
= timespec_load(&st
.st_mtim
);
1412 u
->source_mtime
= 0;
1418 void unit_add_to_target_deps_queue(Unit
*u
) {
1419 Manager
*m
= u
->manager
;
1423 if (u
->in_target_deps_queue
)
1426 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1427 u
->in_target_deps_queue
= true;
1430 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1434 if (target
->type
!= UNIT_TARGET
)
1437 /* Only add the dependency if both units are loaded, so that
1438 * that loop check below is reliable */
1439 if (u
->load_state
!= UNIT_LOADED
||
1440 target
->load_state
!= UNIT_LOADED
)
1443 /* If either side wants no automatic dependencies, then let's
1445 if (!u
->default_dependencies
||
1446 !target
->default_dependencies
)
1449 /* Don't create loops */
1450 if (unit_has_dependency(target
, UNIT_ATOM_BEFORE
, u
))
1453 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1456 static int unit_add_slice_dependencies(Unit
*u
) {
1460 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1463 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1464 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1466 UnitDependencyMask mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1468 slice
= UNIT_GET_SLICE(u
);
1470 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, slice
, true, mask
);
1472 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1475 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1478 static int unit_add_mount_dependencies(Unit
*u
) {
1479 UnitDependencyInfo di
;
1485 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
) {
1486 char prefix
[strlen(path
) + 1];
1488 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1489 _cleanup_free_
char *p
= NULL
;
1492 r
= unit_name_from_path(prefix
, ".mount", &p
);
1493 if (IN_SET(r
, -EINVAL
, -ENAMETOOLONG
))
1494 continue; /* If the path cannot be converted to a mount unit name, then it's
1495 * not manageable as a unit by systemd, and hence we don't need a
1496 * dependency on it. Let's thus silently ignore the issue. */
1500 m
= manager_get_unit(u
->manager
, p
);
1502 /* Make sure to load the mount unit if it exists. If so the dependencies on
1503 * this unit will be added later during the loading of the mount unit. */
1504 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1510 if (m
->load_state
!= UNIT_LOADED
)
1513 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1517 if (m
->fragment_path
) {
1518 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1528 static int unit_add_oomd_dependencies(Unit
*u
) {
1535 if (!u
->default_dependencies
)
1538 c
= unit_get_cgroup_context(u
);
1542 wants_oomd
= (c
->moom_swap
== MANAGED_OOM_KILL
|| c
->moom_mem_pressure
== MANAGED_OOM_KILL
);
1546 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "systemd-oomd.service", true, UNIT_DEPENDENCY_FILE
);
1553 static int unit_add_startup_units(Unit
*u
) {
1556 c
= unit_get_cgroup_context(u
);
1560 if (c
->startup_cpu_shares
== CGROUP_CPU_SHARES_INVALID
&&
1561 c
->startup_io_weight
== CGROUP_WEIGHT_INVALID
&&
1562 c
->startup_blockio_weight
== CGROUP_BLKIO_WEIGHT_INVALID
)
1565 return set_ensure_put(&u
->manager
->startup_units
, NULL
, u
);
1568 static int unit_validate_on_failure_job_mode(
1570 const char *job_mode_setting
,
1572 const char *dependency_name
,
1573 UnitDependencyAtom atom
) {
1575 Unit
*other
, *found
= NULL
;
1577 if (job_mode
!= JOB_ISOLATE
)
1580 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
1583 else if (found
!= other
)
1584 return log_unit_error_errno(
1585 u
, SYNTHETIC_ERRNO(ENOEXEC
),
1586 "More than one %s dependencies specified but %sisolate set. Refusing.",
1587 dependency_name
, job_mode_setting
);
1593 int unit_load(Unit
*u
) {
1598 if (u
->in_load_queue
) {
1599 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1600 u
->in_load_queue
= false;
1603 if (u
->type
== _UNIT_TYPE_INVALID
)
1606 if (u
->load_state
!= UNIT_STUB
)
1609 if (u
->transient_file
) {
1610 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1611 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1613 r
= fflush_and_check(u
->transient_file
);
1617 u
->transient_file
= safe_fclose(u
->transient_file
);
1618 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1621 r
= UNIT_VTABLE(u
)->load(u
);
1625 assert(u
->load_state
!= UNIT_STUB
);
1627 if (u
->load_state
== UNIT_LOADED
) {
1628 unit_add_to_target_deps_queue(u
);
1630 r
= unit_add_slice_dependencies(u
);
1634 r
= unit_add_mount_dependencies(u
);
1638 r
= unit_add_oomd_dependencies(u
);
1642 r
= unit_add_startup_units(u
);
1646 r
= unit_validate_on_failure_job_mode(u
, "OnSuccessJobMode=", u
->on_success_job_mode
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
);
1650 r
= unit_validate_on_failure_job_mode(u
, "OnFailureJobMode=", u
->on_failure_job_mode
, "OnFailure=", UNIT_ATOM_ON_FAILURE
);
1654 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1655 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1657 /* We finished loading, let's ensure our parents recalculate the members mask */
1658 unit_invalidate_cgroup_members_masks(u
);
1661 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1663 unit_add_to_dbus_queue(unit_follow_merge(u
));
1664 unit_add_to_gc_queue(u
);
1665 (void) manager_varlink_send_managed_oom_update(u
);
1670 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code
1671 * should hence return ENOEXEC to ensure units are placed in this state after loading. */
1673 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1674 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1678 /* Record the timestamp on the cache, so that if the cache gets updated between now and the next time
1679 * an attempt is made to load this unit, we know we need to check again. */
1680 if (u
->load_state
== UNIT_NOT_FOUND
)
1681 u
->fragment_not_found_timestamp_hash
= u
->manager
->unit_cache_timestamp_hash
;
1683 unit_add_to_dbus_queue(u
);
1684 unit_add_to_gc_queue(u
);
1686 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1690 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1695 if (u
&& !unit_log_level_test(u
, level
))
1696 return -ERRNO_VALUE(error
);
1698 va_start(ap
, format
);
1700 r
= log_object_internalv(level
, error
, file
, line
, func
,
1701 u
->manager
->unit_log_field
,
1703 u
->manager
->invocation_log_field
,
1704 u
->invocation_id_string
,
1707 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1713 static bool unit_test_condition(Unit
*u
) {
1714 _cleanup_strv_free_
char **env
= NULL
;
1719 dual_timestamp_get(&u
->condition_timestamp
);
1721 r
= manager_get_effective_environment(u
->manager
, &env
);
1723 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1724 u
->condition_result
= CONDITION_ERROR
;
1726 u
->condition_result
= condition_test_list(
1729 condition_type_to_string
,
1733 unit_add_to_dbus_queue(u
);
1734 return u
->condition_result
;
1737 static bool unit_test_assert(Unit
*u
) {
1738 _cleanup_strv_free_
char **env
= NULL
;
1743 dual_timestamp_get(&u
->assert_timestamp
);
1745 r
= manager_get_effective_environment(u
->manager
, &env
);
1747 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1748 u
->assert_result
= CONDITION_ERROR
;
1750 u
->assert_result
= condition_test_list(
1753 assert_type_to_string
,
1757 unit_add_to_dbus_queue(u
);
1758 return u
->assert_result
;
1761 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *format
, const char *ident
) {
1762 if (log_get_show_color()) {
1763 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& strchr(ident
, ' '))
1764 ident
= strjoina(ANSI_HIGHLIGHT
, u
->id
, ANSI_NORMAL
, " - ", u
->description
);
1766 ident
= strjoina(ANSI_HIGHLIGHT
, ident
, ANSI_NORMAL
);
1769 DISABLE_WARNING_FORMAT_NONLITERAL
;
1770 manager_status_printf(u
->manager
, status_type
, status
, format
, ident
);
1774 int unit_test_start_limit(Unit
*u
) {
1779 if (ratelimit_below(&u
->start_ratelimit
)) {
1780 u
->start_limit_hit
= false;
1784 log_unit_warning(u
, "Start request repeated too quickly.");
1785 u
->start_limit_hit
= true;
1787 reason
= strjoina("unit ", u
->id
, " failed");
1789 emergency_action(u
->manager
, u
->start_limit_action
,
1790 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1791 u
->reboot_arg
, -1, reason
);
1796 bool unit_shall_confirm_spawn(Unit
*u
) {
1799 if (manager_is_confirm_spawn_disabled(u
->manager
))
1802 /* For some reasons units remaining in the same process group
1803 * as PID 1 fail to acquire the console even if it's not used
1804 * by any process. So skip the confirmation question for them. */
1805 return !unit_get_exec_context(u
)->same_pgrp
;
1808 static bool unit_verify_deps(Unit
*u
) {
1813 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined
1814 * with After=. We do not check Requires= or Requisite= here as they only should have an effect on
1815 * the job processing, but do not have any effect afterwards. We don't check BindsTo= dependencies
1816 * that are not used in conjunction with After= as for them any such check would make things entirely
1819 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
1821 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
))
1824 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1825 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1833 /* Errors that aren't really errors:
1834 * -EALREADY: Unit is already started.
1835 * -ECOMM: Condition failed
1836 * -EAGAIN: An operation is already in progress. Retry later.
1838 * Errors that are real errors:
1839 * -EBADR: This unit type does not support starting.
1840 * -ECANCELED: Start limit hit, too many requests for now
1841 * -EPROTO: Assert failed
1842 * -EINVAL: Unit not loaded
1843 * -EOPNOTSUPP: Unit type not supported
1844 * -ENOLINK: The necessary dependencies are not fulfilled.
1845 * -ESTALE: This unit has been started before and can't be started a second time
1846 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1848 int unit_start(Unit
*u
) {
1849 UnitActiveState state
;
1854 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1855 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1856 * waiting is finished. */
1857 state
= unit_active_state(u
);
1858 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1860 if (state
== UNIT_MAINTENANCE
)
1863 /* Units that aren't loaded cannot be started */
1864 if (u
->load_state
!= UNIT_LOADED
)
1867 /* Refuse starting scope units more than once */
1868 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1871 /* If the conditions failed, don't do anything at all. If we already are activating this call might
1872 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1873 * recheck the condition in that case. */
1874 if (state
!= UNIT_ACTIVATING
&&
1875 !unit_test_condition(u
))
1876 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition failed. Not starting unit.");
1878 /* If the asserts failed, fail the entire job */
1879 if (state
!= UNIT_ACTIVATING
&&
1880 !unit_test_assert(u
))
1881 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1883 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1884 * condition checks, so that we rather return condition check errors (which are usually not
1885 * considered a true failure) than "not supported" errors (which are considered a failure).
1887 if (!unit_type_supported(u
->type
))
1890 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1891 * should have taken care of this already, but let's check this here again. After all, our
1892 * dependencies might not be in effect anymore, due to a reload or due to a failed condition. */
1893 if (!unit_verify_deps(u
))
1896 /* Forward to the main object, if we aren't it. */
1897 following
= unit_following(u
);
1899 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1900 return unit_start(following
);
1903 /* If it is stopped, but we cannot start it, then fail */
1904 if (!UNIT_VTABLE(u
)->start
)
1907 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1908 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1909 * waits for a holdoff timer to elapse before it will start again. */
1911 unit_add_to_dbus_queue(u
);
1912 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1914 return UNIT_VTABLE(u
)->start(u
);
1917 bool unit_can_start(Unit
*u
) {
1920 if (u
->load_state
!= UNIT_LOADED
)
1923 if (!unit_type_supported(u
->type
))
1926 /* Scope units may be started only once */
1927 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
1930 return !!UNIT_VTABLE(u
)->start
;
1933 bool unit_can_isolate(Unit
*u
) {
1936 return unit_can_start(u
) &&
1941 * -EBADR: This unit type does not support stopping.
1942 * -EALREADY: Unit is already stopped.
1943 * -EAGAIN: An operation is already in progress. Retry later.
1945 int unit_stop(Unit
*u
) {
1946 UnitActiveState state
;
1951 state
= unit_active_state(u
);
1952 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1955 following
= unit_following(u
);
1957 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1958 return unit_stop(following
);
1961 if (!UNIT_VTABLE(u
)->stop
)
1964 unit_add_to_dbus_queue(u
);
1965 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1967 return UNIT_VTABLE(u
)->stop(u
);
1970 bool unit_can_stop(Unit
*u
) {
1973 /* Note: if we return true here, it does not mean that the unit may be successfully stopped.
1974 * Extrinsic units follow external state and they may stop following external state changes
1975 * (hence we return true here), but an attempt to do this through the manager will fail. */
1977 if (!unit_type_supported(u
->type
))
1983 return !!UNIT_VTABLE(u
)->stop
;
1987 * -EBADR: This unit type does not support reloading.
1988 * -ENOEXEC: Unit is not started.
1989 * -EAGAIN: An operation is already in progress. Retry later.
1991 int unit_reload(Unit
*u
) {
1992 UnitActiveState state
;
1997 if (u
->load_state
!= UNIT_LOADED
)
2000 if (!unit_can_reload(u
))
2003 state
= unit_active_state(u
);
2004 if (state
== UNIT_RELOADING
)
2007 if (state
!= UNIT_ACTIVE
)
2008 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
), "Unit cannot be reloaded because it is inactive.");
2010 following
= unit_following(u
);
2012 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
2013 return unit_reload(following
);
2016 unit_add_to_dbus_queue(u
);
2018 if (!UNIT_VTABLE(u
)->reload
) {
2019 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
2020 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), 0);
2024 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2026 return UNIT_VTABLE(u
)->reload(u
);
2029 bool unit_can_reload(Unit
*u
) {
2032 if (UNIT_VTABLE(u
)->can_reload
)
2033 return UNIT_VTABLE(u
)->can_reload(u
);
2035 if (unit_has_dependency(u
, UNIT_ATOM_PROPAGATES_RELOAD_TO
, NULL
))
2038 return UNIT_VTABLE(u
)->reload
;
2041 bool unit_is_unneeded(Unit
*u
) {
2045 if (!u
->stop_when_unneeded
)
2048 /* Don't clean up while the unit is transitioning or is even inactive. */
2049 if (unit_active_state(u
) != UNIT_ACTIVE
)
2054 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_PINS_STOP_WHEN_UNNEEDED
) {
2055 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
2056 * restart, then don't clean this one up. */
2061 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2064 if (unit_will_restart(other
))
2071 bool unit_is_upheld_by_active(Unit
*u
, Unit
**ret_culprit
) {
2076 /* Checks if the unit needs to be started because it currently is not running, but some other unit
2077 * that is active declared an Uphold= dependencies on it */
2079 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)) || u
->job
) {
2081 *ret_culprit
= NULL
;
2085 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_START_STEADILY
) {
2089 if (UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
2091 *ret_culprit
= other
;
2097 *ret_culprit
= NULL
;
2101 bool unit_is_bound_by_inactive(Unit
*u
, Unit
**ret_culprit
) {
2106 /* Checks whether this unit is bound to another unit that is inactive, i.e. whether we should stop
2107 * because the other unit is down. */
2109 if (unit_active_state(u
) != UNIT_ACTIVE
|| u
->job
) {
2110 /* Don't clean up while the unit is transitioning or is even inactive. */
2112 *ret_culprit
= NULL
;
2116 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
2120 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
))) {
2122 *ret_culprit
= other
;
2129 *ret_culprit
= NULL
;
2133 static void check_unneeded_dependencies(Unit
*u
) {
2137 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2139 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_STOP_WHEN_UNNEEDED_QUEUE
)
2140 unit_submit_to_stop_when_unneeded_queue(other
);
2143 static void check_uphold_dependencies(Unit
*u
) {
2147 /* Add all units this unit depends on to the queue that processes Uphold= behaviour. */
2149 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_START_WHEN_UPHELD_QUEUE
)
2150 unit_submit_to_start_when_upheld_queue(other
);
2153 static void check_bound_by_dependencies(Unit
*u
) {
2157 /* Add all units this unit depends on to the queue that processes BindsTo= stop behaviour. */
2159 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_CANNOT_BE_ACTIVE_WITHOUT_QUEUE
)
2160 unit_submit_to_stop_when_bound_queue(other
);
2163 static void retroactively_start_dependencies(Unit
*u
) {
2167 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2169 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_REPLACE
) /* Requires= + BindsTo= */
2170 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2171 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2172 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2174 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_FAIL
) /* Wants= */
2175 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2176 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2177 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2179 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_START
) /* Conflicts= (and inverse) */
2180 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2181 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2184 static void retroactively_stop_dependencies(Unit
*u
) {
2188 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2190 /* Pull down units which are bound to us recursively if enabled */
2191 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_STOP
) /* BoundBy= */
2192 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2193 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2196 void unit_start_on_failure(
2198 const char *dependency_name
,
2199 UnitDependencyAtom atom
,
2202 bool logged
= false;
2207 assert(dependency_name
);
2208 assert(IN_SET(atom
, UNIT_ATOM_ON_SUCCESS
, UNIT_ATOM_ON_FAILURE
));
2210 /* Act on OnFailure= and OnSuccess= dependencies */
2212 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
2213 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2216 log_unit_info(u
, "Triggering %s dependencies.", dependency_name
);
2220 r
= manager_add_job(u
->manager
, JOB_START
, other
, job_mode
, NULL
, &error
, NULL
);
2222 log_unit_warning_errno(
2223 u
, r
, "Failed to enqueue %s job, ignoring: %s",
2224 dependency_name
, bus_error_message(&error
, r
));
2228 log_unit_debug(u
, "Triggering %s dependencies done.", dependency_name
);
2231 void unit_trigger_notify(Unit
*u
) {
2236 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_TRIGGERED_BY
)
2237 if (UNIT_VTABLE(other
)->trigger_notify
)
2238 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2241 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2242 if (condition_notice
&& log_level
> LOG_NOTICE
)
2244 if (condition_info
&& log_level
> LOG_INFO
)
2249 static int unit_log_resources(Unit
*u
) {
2250 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4];
2251 bool any_traffic
= false, have_ip_accounting
= false, any_io
= false, have_io_accounting
= false;
2252 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
, *rr
= NULL
, *wr
= NULL
;
2253 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a threshold */
2254 size_t n_message_parts
= 0, n_iovec
= 0;
2255 char* message_parts
[1 + 2 + 2 + 1], *t
;
2256 nsec_t nsec
= NSEC_INFINITY
;
2258 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2259 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2260 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2261 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2262 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2264 const char* const io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2265 [CGROUP_IO_READ_BYTES
] = "IO_METRIC_READ_BYTES",
2266 [CGROUP_IO_WRITE_BYTES
] = "IO_METRIC_WRITE_BYTES",
2267 [CGROUP_IO_READ_OPERATIONS
] = "IO_METRIC_READ_OPERATIONS",
2268 [CGROUP_IO_WRITE_OPERATIONS
] = "IO_METRIC_WRITE_OPERATIONS",
2273 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2274 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2275 * information and the complete data in structured fields. */
2277 (void) unit_get_cpu_usage(u
, &nsec
);
2278 if (nsec
!= NSEC_INFINITY
) {
2279 /* Format the CPU time for inclusion in the structured log message */
2280 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2284 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2286 /* Format the CPU time for inclusion in the human language message string */
2287 t
= strjoin("consumed ", FORMAT_TIMESPAN(nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
), " CPU time");
2293 message_parts
[n_message_parts
++] = t
;
2295 log_level
= raise_level(log_level
,
2296 nsec
> NOTICEWORTHY_CPU_NSEC
,
2297 nsec
> MENTIONWORTHY_CPU_NSEC
);
2300 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2301 uint64_t value
= UINT64_MAX
;
2303 assert(io_fields
[k
]);
2305 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2306 if (value
== UINT64_MAX
)
2309 have_io_accounting
= true;
2313 /* Format IO accounting data for inclusion in the structured log message */
2314 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2318 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2320 /* Format the IO accounting data for inclusion in the human language message string, but only
2321 * for the bytes counters (and not for the operations counters) */
2322 if (k
== CGROUP_IO_READ_BYTES
) {
2324 rr
= strjoin("read ", strna(FORMAT_BYTES(value
)), " from disk");
2329 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2331 wr
= strjoin("written ", strna(FORMAT_BYTES(value
)), " to disk");
2338 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2339 log_level
= raise_level(log_level
,
2340 value
> MENTIONWORTHY_IO_BYTES
,
2341 value
> NOTICEWORTHY_IO_BYTES
);
2344 if (have_io_accounting
) {
2347 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2349 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2354 k
= strdup("no IO");
2360 message_parts
[n_message_parts
++] = k
;
2364 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2365 uint64_t value
= UINT64_MAX
;
2367 assert(ip_fields
[m
]);
2369 (void) unit_get_ip_accounting(u
, m
, &value
);
2370 if (value
== UINT64_MAX
)
2373 have_ip_accounting
= true;
2377 /* Format IP accounting data for inclusion in the structured log message */
2378 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2382 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2384 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2385 * bytes counters (and not for the packets counters) */
2386 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2388 igress
= strjoin("received ", strna(FORMAT_BYTES(value
)), " IP traffic");
2393 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2395 egress
= strjoin("sent ", strna(FORMAT_BYTES(value
)), " IP traffic");
2402 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2403 log_level
= raise_level(log_level
,
2404 value
> MENTIONWORTHY_IP_BYTES
,
2405 value
> NOTICEWORTHY_IP_BYTES
);
2408 /* This check is here because it is the earliest point following all possible log_level assignments. If
2409 * log_level is assigned anywhere after this point, move this check. */
2410 if (!unit_log_level_test(u
, log_level
)) {
2415 if (have_ip_accounting
) {
2418 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2420 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2425 k
= strdup("no IP traffic");
2431 message_parts
[n_message_parts
++] = k
;
2435 /* Is there any accounting data available at all? */
2441 if (n_message_parts
== 0)
2442 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2444 _cleanup_free_
char *joined
= NULL
;
2446 message_parts
[n_message_parts
] = NULL
;
2448 joined
= strv_join(message_parts
, ", ");
2454 joined
[0] = ascii_toupper(joined
[0]);
2455 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2458 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2459 * and hence don't increase n_iovec for them */
2460 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2461 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2463 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2464 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2466 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2467 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2469 log_unit_struct_iovec(u
, log_level
, iovec
, n_iovec
+ 4);
2473 for (size_t i
= 0; i
< n_message_parts
; i
++)
2474 free(message_parts
[i
]);
2476 for (size_t i
= 0; i
< n_iovec
; i
++)
2477 free(iovec
[i
].iov_base
);
2483 static void unit_update_on_console(Unit
*u
) {
2488 b
= unit_needs_console(u
);
2489 if (u
->on_console
== b
)
2494 manager_ref_console(u
->manager
);
2496 manager_unref_console(u
->manager
);
2499 static void unit_emit_audit_start(Unit
*u
) {
2502 if (u
->type
!= UNIT_SERVICE
)
2505 /* Write audit record if we have just finished starting up */
2506 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2510 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2513 if (u
->type
!= UNIT_SERVICE
)
2517 /* Write audit record if we have just finished shutting down */
2518 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2519 u
->in_audit
= false;
2521 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2522 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2524 if (state
== UNIT_INACTIVE
)
2525 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2529 static bool unit_process_job(Job
*j
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2530 bool unexpected
= false;
2535 if (j
->state
== JOB_WAITING
)
2537 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2539 job_add_to_run_queue(j
);
2541 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2542 * hence needs to invalidate jobs. */
2547 case JOB_VERIFY_ACTIVE
:
2549 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2550 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2551 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2554 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2555 if (ns
== UNIT_FAILED
)
2556 result
= JOB_FAILED
;
2560 job_finish_and_invalidate(j
, result
, true, false);
2567 case JOB_RELOAD_OR_START
:
2568 case JOB_TRY_RELOAD
:
2570 if (j
->state
== JOB_RUNNING
) {
2571 if (ns
== UNIT_ACTIVE
)
2572 job_finish_and_invalidate(j
, (flags
& UNIT_NOTIFY_RELOAD_FAILURE
) ? JOB_FAILED
: JOB_DONE
, true, false);
2573 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2576 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2577 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2585 case JOB_TRY_RESTART
:
2587 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2588 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2589 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2591 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2597 assert_not_reached();
2603 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2608 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2609 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2611 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2612 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2613 * remounted this function will be called too! */
2617 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2618 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2619 unit_add_to_dbus_queue(u
);
2621 /* Update systemd-oomd on the property/state change */
2623 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2625 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2626 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2627 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2628 * have the information on the property. Thus, indiscriminately send an update. */
2629 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2630 (void) manager_varlink_send_managed_oom_update(u
);
2633 /* Update timestamps for state changes */
2634 if (!MANAGER_IS_RELOADING(m
)) {
2635 dual_timestamp_get(&u
->state_change_timestamp
);
2637 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2638 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2639 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2640 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2642 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2643 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2644 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2645 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2648 /* Keep track of failed units */
2649 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2651 /* Make sure the cgroup and state files are always removed when we become inactive */
2652 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2653 SET_FLAG(u
->markers
,
2654 (1u << UNIT_MARKER_NEEDS_RELOAD
)|(1u << UNIT_MARKER_NEEDS_RESTART
),
2656 unit_prune_cgroup(u
);
2657 unit_unlink_state_files(u
);
2658 } else if (ns
!= os
&& ns
== UNIT_RELOADING
)
2659 SET_FLAG(u
->markers
, 1u << UNIT_MARKER_NEEDS_RELOAD
, false);
2661 unit_update_on_console(u
);
2663 if (!MANAGER_IS_RELOADING(m
)) {
2666 /* Let's propagate state changes to the job */
2668 unexpected
= unit_process_job(u
->job
, ns
, flags
);
2672 /* If this state change happened without being requested by a job, then let's retroactively start or
2673 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2674 * additional jobs just because something is already activated. */
2677 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2678 retroactively_start_dependencies(u
);
2679 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2680 retroactively_stop_dependencies(u
);
2683 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2684 log_unit_debug(u
, "Unit entered failed state.");
2686 if (!(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2687 unit_start_on_failure(u
, "OnFailure=", UNIT_ATOM_ON_FAILURE
, u
->on_failure_job_mode
);
2690 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2691 /* This unit just finished starting up */
2693 unit_emit_audit_start(u
);
2694 manager_send_unit_plymouth(m
, u
);
2697 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2698 /* This unit just stopped/failed. */
2700 unit_emit_audit_stop(u
, ns
);
2701 unit_log_resources(u
);
2704 if (ns
== UNIT_INACTIVE
&& !IN_SET(os
, UNIT_FAILED
, UNIT_INACTIVE
, UNIT_MAINTENANCE
) &&
2705 !(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2706 unit_start_on_failure(u
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
, u
->on_success_job_mode
);
2709 manager_recheck_journal(m
);
2710 manager_recheck_dbus(m
);
2712 unit_trigger_notify(u
);
2714 if (!MANAGER_IS_RELOADING(m
)) {
2715 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2716 reason
= strjoina("unit ", u
->id
, " failed");
2717 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2718 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2719 reason
= strjoina("unit ", u
->id
, " succeeded");
2720 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2724 /* And now, add the unit or depending units to various queues that will act on the new situation if
2725 * needed. These queues generally check for continuous state changes rather than events (like most of
2726 * the state propagation above), and do work deferred instead of instantly, since they typically
2727 * don't want to run during reloading, and usually involve checking combined state of multiple units
2730 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2731 /* Stop unneeded units and bound-by units regardless if going down was expected or not */
2732 check_unneeded_dependencies(u
);
2733 check_bound_by_dependencies(u
);
2735 /* Maybe someone wants us to remain up? */
2736 unit_submit_to_start_when_upheld_queue(u
);
2738 /* Maybe the unit should be GC'ed now? */
2739 unit_add_to_gc_queue(u
);
2742 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2743 /* Start uphold units regardless if going up was expected or not */
2744 check_uphold_dependencies(u
);
2746 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2747 unit_submit_to_stop_when_unneeded_queue(u
);
2749 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens
2750 * when something BindsTo= to a Type=oneshot unit, as these units go directly from starting to
2751 * inactive, without ever entering started.) */
2752 unit_submit_to_stop_when_bound_queue(u
);
2756 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2760 assert(pid_is_valid(pid
));
2762 /* Watch a specific PID */
2764 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2765 * opportunity to remove any stalled references to this PID as they can be created
2766 * easily (when watching a process which is not our direct child). */
2768 manager_unwatch_pid(u
->manager
, pid
);
2770 r
= set_ensure_allocated(&u
->pids
, NULL
);
2774 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2778 /* First try, let's add the unit keyed by "pid". */
2779 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2785 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2786 * to an array of Units rather than just a Unit), lists us already. */
2788 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2790 for (; array
[n
]; n
++)
2794 if (found
) /* Found it already? if so, do nothing */
2799 /* Allocate a new array */
2800 new_array
= new(Unit
*, n
+ 2);
2804 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2806 new_array
[n
+1] = NULL
;
2808 /* Add or replace the old array */
2809 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2820 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2827 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2831 assert(pid_is_valid(pid
));
2833 /* First let's drop the unit in case it's keyed as "pid". */
2834 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2836 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2837 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2839 /* Let's iterate through the array, dropping our own entry */
2842 for (size_t n
= 0; array
[n
]; n
++)
2844 array
[m
++] = array
[n
];
2848 /* The array is now empty, remove the entire entry */
2849 assert_se(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2854 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2857 void unit_unwatch_all_pids(Unit
*u
) {
2860 while (!set_isempty(u
->pids
))
2861 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2863 u
->pids
= set_free(u
->pids
);
2866 static void unit_tidy_watch_pids(Unit
*u
) {
2867 pid_t except1
, except2
;
2872 /* Cleans dead PIDs from our list */
2874 except1
= unit_main_pid(u
);
2875 except2
= unit_control_pid(u
);
2877 SET_FOREACH(e
, u
->pids
) {
2878 pid_t pid
= PTR_TO_PID(e
);
2880 if (pid
== except1
|| pid
== except2
)
2883 if (!pid_is_unwaited(pid
))
2884 unit_unwatch_pid(u
, pid
);
2888 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2894 unit_tidy_watch_pids(u
);
2895 unit_watch_all_pids(u
);
2897 /* If the PID set is empty now, then let's finish this off. */
2898 unit_synthesize_cgroup_empty_event(u
);
2903 int unit_enqueue_rewatch_pids(Unit
*u
) {
2908 if (!u
->cgroup_path
)
2911 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2914 if (r
> 0) /* On unified we can use proper notifications */
2917 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2918 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2919 * involves issuing kill(pid, 0) on all processes we watch. */
2921 if (!u
->rewatch_pids_event_source
) {
2922 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2924 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2926 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2928 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2930 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
2932 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2934 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2937 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2939 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2944 void unit_dequeue_rewatch_pids(Unit
*u
) {
2948 if (!u
->rewatch_pids_event_source
)
2951 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
2953 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
2955 u
->rewatch_pids_event_source
= sd_event_source_disable_unref(u
->rewatch_pids_event_source
);
2958 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2960 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2964 case JOB_VERIFY_ACTIVE
:
2967 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2968 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
2973 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2974 * external events), hence it makes no sense to permit enqueuing such a request either. */
2975 return !u
->perpetual
;
2978 case JOB_TRY_RESTART
:
2979 return unit_can_stop(u
) && unit_can_start(u
);
2982 case JOB_TRY_RELOAD
:
2983 return unit_can_reload(u
);
2985 case JOB_RELOAD_OR_START
:
2986 return unit_can_reload(u
) && unit_can_start(u
);
2989 assert_not_reached();
2993 int unit_add_dependency(
2998 UnitDependencyMask mask
) {
3000 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
3001 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
3002 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
3003 [UNIT_WANTS
] = UNIT_WANTED_BY
,
3004 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
3005 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
3006 [UNIT_UPHOLDS
] = UNIT_UPHELD_BY
,
3007 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
3008 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
3009 [UNIT_WANTED_BY
] = UNIT_WANTS
,
3010 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
3011 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
3012 [UNIT_UPHELD_BY
] = UNIT_UPHOLDS
,
3013 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
3014 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
3015 [UNIT_BEFORE
] = UNIT_AFTER
,
3016 [UNIT_AFTER
] = UNIT_BEFORE
,
3017 [UNIT_ON_SUCCESS
] = UNIT_ON_SUCCESS_OF
,
3018 [UNIT_ON_SUCCESS_OF
] = UNIT_ON_SUCCESS
,
3019 [UNIT_ON_FAILURE
] = UNIT_ON_FAILURE_OF
,
3020 [UNIT_ON_FAILURE_OF
] = UNIT_ON_FAILURE
,
3021 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
3022 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
3023 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3024 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3025 [UNIT_PROPAGATES_STOP_TO
] = UNIT_STOP_PROPAGATED_FROM
,
3026 [UNIT_STOP_PROPAGATED_FROM
] = UNIT_PROPAGATES_STOP_TO
,
3027 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
, /* symmetric! 👓 */
3028 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3029 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3030 [UNIT_IN_SLICE
] = UNIT_SLICE_OF
,
3031 [UNIT_SLICE_OF
] = UNIT_IN_SLICE
,
3033 Unit
*original_u
= u
, *original_other
= other
;
3034 UnitDependencyAtom a
;
3037 /* Helper to know whether sending a notification is necessary or not: if the dependency is already
3038 * there, no need to notify! */
3042 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3045 u
= unit_follow_merge(u
);
3046 other
= unit_follow_merge(other
);
3047 a
= unit_dependency_to_atom(d
);
3050 /* We won't allow dependencies on ourselves. We will not consider them an error however. */
3052 unit_maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
3056 /* Note that ordering a device unit after a unit is permitted since it allows to start its job
3057 * running timeout at a specific time. */
3058 if (FLAGS_SET(a
, UNIT_ATOM_BEFORE
) && other
->type
== UNIT_DEVICE
) {
3059 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3063 if (FLAGS_SET(a
, UNIT_ATOM_ON_FAILURE
) && !UNIT_VTABLE(u
)->can_fail
) {
3064 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3068 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERS
) && !UNIT_VTABLE(u
)->can_trigger
)
3069 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3070 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3071 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERED_BY
) && !UNIT_VTABLE(other
)->can_trigger
)
3072 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3073 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3075 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && other
->type
!= UNIT_SLICE
)
3076 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3077 "Requested dependency Slice=%s refused (%s is not a slice unit).", other
->id
, other
->id
);
3078 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && u
->type
!= UNIT_SLICE
)
3079 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3080 "Requested dependency SliceOf=%s refused (%s is not a slice unit).", other
->id
, u
->id
);
3082 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && !UNIT_HAS_CGROUP_CONTEXT(u
))
3083 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3084 "Requested dependency Slice=%s refused (%s is not a cgroup unit).", other
->id
, u
->id
);
3086 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && !UNIT_HAS_CGROUP_CONTEXT(other
))
3087 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3088 "Requested dependency SliceOf=%s refused (%s is not a cgroup unit).", other
->id
, other
->id
);
3090 r
= unit_add_dependency_hashmap(&u
->dependencies
, d
, other
, mask
, 0);
3095 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
3096 r
= unit_add_dependency_hashmap(&other
->dependencies
, inverse_table
[d
], u
, 0, mask
);
3103 if (add_reference
) {
3104 r
= unit_add_dependency_hashmap(&u
->dependencies
, UNIT_REFERENCES
, other
, mask
, 0);
3110 r
= unit_add_dependency_hashmap(&other
->dependencies
, UNIT_REFERENCED_BY
, u
, 0, mask
);
3118 unit_add_to_dbus_queue(u
);
3123 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3128 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3132 return unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3135 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3143 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3150 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3152 _cleanup_free_
char *i
= NULL
;
3154 r
= unit_name_to_prefix(u
->id
, &i
);
3158 r
= unit_name_replace_instance(name
, i
, buf
);
3167 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3168 _cleanup_free_
char *buf
= NULL
;
3175 r
= resolve_template(u
, name
, &buf
, &name
);
3179 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3183 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3186 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3187 _cleanup_free_
char *buf
= NULL
;
3194 r
= resolve_template(u
, name
, &buf
, &name
);
3198 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3202 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3205 int set_unit_path(const char *p
) {
3206 /* This is mostly for debug purposes */
3207 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
3213 char *unit_dbus_path(Unit
*u
) {
3219 return unit_dbus_path_from_name(u
->id
);
3222 char *unit_dbus_path_invocation_id(Unit
*u
) {
3225 if (sd_id128_is_null(u
->invocation_id
))
3228 return unit_dbus_path_from_name(u
->invocation_id_string
);
3231 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3236 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3238 if (sd_id128_equal(u
->invocation_id
, id
))
3241 if (!sd_id128_is_null(u
->invocation_id
))
3242 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3244 if (sd_id128_is_null(id
)) {
3249 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3253 u
->invocation_id
= id
;
3254 sd_id128_to_string(id
, u
->invocation_id_string
);
3256 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3263 u
->invocation_id
= SD_ID128_NULL
;
3264 u
->invocation_id_string
[0] = 0;
3268 int unit_set_slice(Unit
*u
, Unit
*slice
, UnitDependencyMask mask
) {
3274 /* Sets the unit slice if it has not been set before. Is extra careful, to only allow this for units
3275 * that actually have a cgroup context. Also, we don't allow to set this for slices (since the parent
3276 * slice is derived from the name). Make sure the unit we set is actually a slice. */
3278 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3281 if (u
->type
== UNIT_SLICE
)
3284 if (unit_active_state(u
) != UNIT_INACTIVE
)
3287 if (slice
->type
!= UNIT_SLICE
)
3290 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3291 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3294 if (UNIT_GET_SLICE(u
) == slice
)
3297 /* Disallow slice changes if @u is already bound to cgroups */
3298 if (UNIT_GET_SLICE(u
) && u
->cgroup_realized
)
3301 r
= unit_add_dependency(u
, UNIT_IN_SLICE
, slice
, true, mask
);
3308 int unit_set_default_slice(Unit
*u
) {
3309 const char *slice_name
;
3315 if (UNIT_GET_SLICE(u
))
3319 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3321 /* Implicitly place all instantiated units in their
3322 * own per-template slice */
3324 r
= unit_name_to_prefix(u
->id
, &prefix
);
3328 /* The prefix is already escaped, but it might include
3329 * "-" which has a special meaning for slice units,
3330 * hence escape it here extra. */
3331 escaped
= unit_name_escape(prefix
);
3335 if (MANAGER_IS_SYSTEM(u
->manager
))
3336 slice_name
= strjoina("system-", escaped
, ".slice");
3338 slice_name
= strjoina("app-", escaped
, ".slice");
3340 } else if (unit_is_extrinsic(u
))
3341 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3342 * the root slice. They don't really belong in one of the subslices. */
3343 slice_name
= SPECIAL_ROOT_SLICE
;
3345 else if (MANAGER_IS_SYSTEM(u
->manager
))
3346 slice_name
= SPECIAL_SYSTEM_SLICE
;
3348 slice_name
= SPECIAL_APP_SLICE
;
3350 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3354 return unit_set_slice(u
, slice
, UNIT_DEPENDENCY_FILE
);
3357 const char *unit_slice_name(Unit
*u
) {
3361 slice
= UNIT_GET_SLICE(u
);
3368 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3369 _cleanup_free_
char *t
= NULL
;
3376 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3379 if (unit_has_name(u
, t
))
3382 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3383 assert(r
< 0 || *_found
!= u
);
3387 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3388 const char *new_owner
;
3395 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3397 bus_log_parse_error(r
);
3401 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3402 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3407 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3408 const sd_bus_error
*e
;
3409 const char *new_owner
;
3416 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3418 e
= sd_bus_message_get_error(message
);
3420 if (!sd_bus_error_has_name(e
, "org.freedesktop.DBus.Error.NameHasNoOwner"))
3421 log_unit_error(u
, "Unexpected error response from GetNameOwner(): %s", e
->message
);
3425 r
= sd_bus_message_read(message
, "s", &new_owner
);
3427 return bus_log_parse_error(r
);
3429 assert(!isempty(new_owner
));
3432 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3433 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3438 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3446 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3449 match
= strjoina("type='signal',"
3450 "sender='org.freedesktop.DBus',"
3451 "path='/org/freedesktop/DBus',"
3452 "interface='org.freedesktop.DBus',"
3453 "member='NameOwnerChanged',"
3454 "arg0='", name
, "'");
3456 r
= sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3460 r
= sd_bus_call_method_async(
3462 &u
->get_name_owner_slot
,
3463 "org.freedesktop.DBus",
3464 "/org/freedesktop/DBus",
3465 "org.freedesktop.DBus",
3467 get_name_owner_handler
,
3471 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3475 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3479 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3485 /* Watch a specific name on the bus. We only support one unit
3486 * watching each name for now. */
3488 if (u
->manager
->api_bus
) {
3489 /* If the bus is already available, install the match directly.
3490 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3491 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3493 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3496 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3498 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3499 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3500 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3506 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3510 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3511 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3512 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3515 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3516 _cleanup_free_
char *e
= NULL
;
3522 /* Adds in links to the device node that this unit is based on */
3526 if (!is_device_path(what
))
3529 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3530 if (!unit_type_supported(UNIT_DEVICE
))
3533 r
= unit_name_from_path(what
, ".device", &e
);
3537 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3541 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3542 dep
= UNIT_BINDS_TO
;
3544 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3545 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3546 device
, true, mask
);
3549 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3550 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3558 if (!path_startswith(what
, "/dev/"))
3561 /* If we don't support devices, then also don't bother with blockdev@.target */
3562 if (!unit_type_supported(UNIT_DEVICE
))
3565 r
= unit_name_path_escape(what
, &escaped
);
3569 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3573 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3576 int unit_coldplug(Unit
*u
) {
3583 /* Make sure we don't enter a loop, when coldplugging recursively. */
3587 u
->coldplugged
= true;
3589 STRV_FOREACH(i
, u
->deserialized_refs
) {
3590 q
= bus_unit_track_add_name(u
, *i
);
3591 if (q
< 0 && r
>= 0)
3594 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3596 if (UNIT_VTABLE(u
)->coldplug
) {
3597 q
= UNIT_VTABLE(u
)->coldplug(u
);
3598 if (q
< 0 && r
>= 0)
3602 uj
= u
->job
?: u
->nop_job
;
3604 q
= job_coldplug(uj
);
3605 if (q
< 0 && r
>= 0)
3612 void unit_catchup(Unit
*u
) {
3615 if (UNIT_VTABLE(u
)->catchup
)
3616 UNIT_VTABLE(u
)->catchup(u
);
3618 unit_cgroup_catchup(u
);
3621 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3627 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3628 * are never out-of-date. */
3629 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3632 if (stat(path
, &st
) < 0)
3633 /* What, cannot access this anymore? */
3637 /* For masked files check if they are still so */
3638 return !null_or_empty(&st
);
3640 /* For non-empty files check the mtime */
3641 return timespec_load(&st
.st_mtim
) > mtime
;
3646 bool unit_need_daemon_reload(Unit
*u
) {
3647 _cleanup_strv_free_
char **t
= NULL
;
3652 /* For unit files, we allow masking… */
3653 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3654 u
->load_state
== UNIT_MASKED
))
3657 /* Source paths should not be masked… */
3658 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3661 if (u
->load_state
== UNIT_LOADED
)
3662 (void) unit_find_dropin_paths(u
, &t
);
3663 if (!strv_equal(u
->dropin_paths
, t
))
3666 /* … any drop-ins that are masked are simply omitted from the list. */
3667 STRV_FOREACH(path
, u
->dropin_paths
)
3668 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3674 void unit_reset_failed(Unit
*u
) {
3677 if (UNIT_VTABLE(u
)->reset_failed
)
3678 UNIT_VTABLE(u
)->reset_failed(u
);
3680 ratelimit_reset(&u
->start_ratelimit
);
3681 u
->start_limit_hit
= false;
3684 Unit
*unit_following(Unit
*u
) {
3687 if (UNIT_VTABLE(u
)->following
)
3688 return UNIT_VTABLE(u
)->following(u
);
3693 bool unit_stop_pending(Unit
*u
) {
3696 /* This call does check the current state of the unit. It's
3697 * hence useful to be called from state change calls of the
3698 * unit itself, where the state isn't updated yet. This is
3699 * different from unit_inactive_or_pending() which checks both
3700 * the current state and for a queued job. */
3702 return unit_has_job_type(u
, JOB_STOP
);
3705 bool unit_inactive_or_pending(Unit
*u
) {
3708 /* Returns true if the unit is inactive or going down */
3710 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3713 if (unit_stop_pending(u
))
3719 bool unit_active_or_pending(Unit
*u
) {
3722 /* Returns true if the unit is active or going up */
3724 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3728 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3734 bool unit_will_restart_default(Unit
*u
) {
3737 return unit_has_job_type(u
, JOB_START
);
3740 bool unit_will_restart(Unit
*u
) {
3743 if (!UNIT_VTABLE(u
)->will_restart
)
3746 return UNIT_VTABLE(u
)->will_restart(u
);
3749 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3751 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3752 assert(SIGNAL_VALID(signo
));
3754 if (!UNIT_VTABLE(u
)->kill
)
3757 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3760 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3761 _cleanup_set_free_ Set
*pid_set
= NULL
;
3764 pid_set
= set_new(NULL
);
3768 /* Exclude the main/control pids from being killed via the cgroup */
3770 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3775 if (control_pid
> 0) {
3776 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3781 return TAKE_PTR(pid_set
);
3784 static int kill_common_log(pid_t pid
, int signo
, void *userdata
) {
3785 _cleanup_free_
char *comm
= NULL
;
3790 (void) get_process_comm(pid
, &comm
);
3791 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
3792 signal_to_string(signo
), pid
, strna(comm
));
3797 int unit_kill_common(
3803 sd_bus_error
*error
) {
3806 bool killed
= false;
3808 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
3809 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
3810 * stop a service ourselves. */
3812 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3814 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3816 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3819 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3820 if (control_pid
< 0)
3821 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3822 if (control_pid
== 0)
3823 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3826 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3827 if (control_pid
> 0) {
3828 _cleanup_free_
char *comm
= NULL
;
3829 (void) get_process_comm(control_pid
, &comm
);
3831 if (kill(control_pid
, signo
) < 0) {
3832 /* Report this failure both to the logs and to the client */
3833 sd_bus_error_set_errnof(
3835 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
3836 signal_to_string(signo
), control_pid
, strna(comm
));
3837 r
= log_unit_warning_errno(
3839 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
3840 signal_to_string(signo
), control_pid
, strna(comm
));
3842 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
3843 signal_to_string(signo
), control_pid
, strna(comm
));
3848 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3850 _cleanup_free_
char *comm
= NULL
;
3851 (void) get_process_comm(main_pid
, &comm
);
3853 if (kill(main_pid
, signo
) < 0) {
3855 sd_bus_error_set_errnof(
3857 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
3858 signal_to_string(signo
), main_pid
, strna(comm
));
3860 r
= log_unit_warning_errno(
3862 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
3863 signal_to_string(signo
), main_pid
, strna(comm
));
3865 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
3866 signal_to_string(signo
), main_pid
, strna(comm
));
3871 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3872 _cleanup_set_free_ Set
*pid_set
= NULL
;
3875 /* Exclude the main/control pids from being killed via the cgroup */
3876 pid_set
= unit_pid_set(main_pid
, control_pid
);
3880 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
3882 if (!IN_SET(q
, -ESRCH
, -ENOENT
)) {
3884 sd_bus_error_set_errnof(
3886 "Failed to send signal SIG%s to auxiliary processes: %m",
3887 signal_to_string(signo
));
3889 r
= log_unit_warning_errno(
3891 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
3892 signal_to_string(signo
));
3898 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
3899 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
3900 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
3905 int unit_following_set(Unit
*u
, Set
**s
) {
3909 if (UNIT_VTABLE(u
)->following_set
)
3910 return UNIT_VTABLE(u
)->following_set(u
, s
);
3916 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3921 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3922 r
= unit_file_get_state(
3923 u
->manager
->unit_file_scope
,
3926 &u
->unit_file_state
);
3928 u
->unit_file_state
= UNIT_FILE_BAD
;
3931 return u
->unit_file_state
;
3934 int unit_get_unit_file_preset(Unit
*u
) {
3937 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3938 u
->unit_file_preset
= unit_file_query_preset(
3939 u
->manager
->unit_file_scope
,
3941 basename(u
->fragment_path
),
3944 return u
->unit_file_preset
;
3947 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
3953 unit_ref_unset(ref
);
3955 ref
->source
= source
;
3956 ref
->target
= target
;
3957 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
3961 void unit_ref_unset(UnitRef
*ref
) {
3967 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
3968 * be unreferenced now. */
3969 unit_add_to_gc_queue(ref
->target
);
3971 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
3972 ref
->source
= ref
->target
= NULL
;
3975 static int user_from_unit_name(Unit
*u
, char **ret
) {
3977 static const uint8_t hash_key
[] = {
3978 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
3979 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
3982 _cleanup_free_
char *n
= NULL
;
3985 r
= unit_name_to_prefix(u
->id
, &n
);
3989 if (valid_user_group_name(n
, 0)) {
3994 /* If we can't use the unit name as a user name, then let's hash it and use that */
3995 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4001 int unit_patch_contexts(Unit
*u
) {
4008 /* Patch in the manager defaults into the exec and cgroup
4009 * contexts, _after_ the rest of the settings have been
4012 ec
= unit_get_exec_context(u
);
4014 /* This only copies in the ones that need memory */
4015 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
4016 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4017 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4022 if (MANAGER_IS_USER(u
->manager
) &&
4023 !ec
->working_directory
) {
4025 r
= get_home_dir(&ec
->working_directory
);
4029 /* Allow user services to run, even if the
4030 * home directory is missing */
4031 ec
->working_directory_missing_ok
= true;
4034 if (ec
->private_devices
)
4035 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4037 if (ec
->protect_kernel_modules
)
4038 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4040 if (ec
->protect_kernel_logs
)
4041 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4043 if (ec
->protect_clock
)
4044 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4046 if (ec
->dynamic_user
) {
4048 r
= user_from_unit_name(u
, &ec
->user
);
4054 ec
->group
= strdup(ec
->user
);
4059 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4060 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4063 ec
->private_tmp
= true;
4064 ec
->remove_ipc
= true;
4065 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4066 if (ec
->protect_home
== PROTECT_HOME_NO
)
4067 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4069 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4071 ec
->no_new_privileges
= true;
4072 ec
->restrict_suid_sgid
= true;
4076 cc
= unit_get_cgroup_context(u
);
4079 if (ec
->private_devices
&&
4080 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4081 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4083 if ((ec
->root_image
|| !LIST_IS_EMPTY(ec
->mount_images
)) &&
4084 (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
)) {
4087 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4088 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4089 r
= cgroup_add_device_allow(cc
, p
, "rw");
4093 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4094 r
= cgroup_add_device_allow(cc
, p
, "rwm");
4099 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4100 * Same for mapper and verity. */
4101 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4102 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4108 if (ec
->protect_clock
) {
4109 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4118 ExecContext
*unit_get_exec_context(const Unit
*u
) {
4125 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4129 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4132 KillContext
*unit_get_kill_context(Unit
*u
) {
4139 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4143 return (KillContext
*) ((uint8_t*) u
+ offset
);
4146 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4152 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4156 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4159 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4165 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4169 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4172 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4175 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4178 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4179 return u
->manager
->lookup_paths
.transient
;
4181 if (flags
& UNIT_PERSISTENT
)
4182 return u
->manager
->lookup_paths
.persistent_control
;
4184 if (flags
& UNIT_RUNTIME
)
4185 return u
->manager
->lookup_paths
.runtime_control
;
4190 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4196 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4197 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4198 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4199 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4200 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4203 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4204 ret
= specifier_escape(s
);
4211 if (flags
& UNIT_ESCAPE_C
) {
4224 return ret
?: (char*) s
;
4227 return ret
?: strdup(s
);
4230 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4231 _cleanup_free_
char *result
= NULL
;
4235 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4236 * way suitable for ExecStart= stanzas */
4238 STRV_FOREACH(i
, l
) {
4239 _cleanup_free_
char *buf
= NULL
;
4244 p
= unit_escape_setting(*i
, flags
, &buf
);
4248 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4249 if (!GREEDY_REALLOC(result
, n
+ a
+ 1))
4263 if (!GREEDY_REALLOC(result
, n
+ 1))
4268 return TAKE_PTR(result
);
4271 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4272 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4273 const char *dir
, *wrapped
;
4280 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4283 data
= unit_escape_setting(data
, flags
, &escaped
);
4287 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4288 * previous section header is the same */
4290 if (flags
& UNIT_PRIVATE
) {
4291 if (!UNIT_VTABLE(u
)->private_section
)
4294 if (!u
->transient_file
|| u
->last_section_private
< 0)
4295 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4296 else if (u
->last_section_private
== 0)
4297 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4299 if (!u
->transient_file
|| u
->last_section_private
< 0)
4300 data
= strjoina("[Unit]\n", data
);
4301 else if (u
->last_section_private
> 0)
4302 data
= strjoina("\n[Unit]\n", data
);
4305 if (u
->transient_file
) {
4306 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4307 * write to the transient unit file. */
4308 fputs(data
, u
->transient_file
);
4310 if (!endswith(data
, "\n"))
4311 fputc('\n', u
->transient_file
);
4313 /* Remember which section we wrote this entry to */
4314 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4318 dir
= unit_drop_in_dir(u
, flags
);
4322 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4323 "# or an equivalent operation. Do not edit.\n",
4327 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4331 (void) mkdir_p_label(p
, 0755);
4333 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4334 * recreate the cache after every drop-in we write. */
4335 if (u
->manager
->unit_path_cache
) {
4336 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4341 r
= write_string_file_atomic_label(q
, wrapped
);
4345 r
= strv_push(&u
->dropin_paths
, q
);
4350 strv_uniq(u
->dropin_paths
);
4352 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4357 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4358 _cleanup_free_
char *p
= NULL
;
4366 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4369 va_start(ap
, format
);
4370 r
= vasprintf(&p
, format
, ap
);
4376 return unit_write_setting(u
, flags
, name
, p
);
4379 int unit_make_transient(Unit
*u
) {
4380 _cleanup_free_
char *path
= NULL
;
4385 if (!UNIT_VTABLE(u
)->can_transient
)
4388 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4390 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4394 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4395 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4397 RUN_WITH_UMASK(0022) {
4398 f
= fopen(path
, "we");
4403 safe_fclose(u
->transient_file
);
4404 u
->transient_file
= f
;
4406 free_and_replace(u
->fragment_path
, path
);
4408 u
->source_path
= mfree(u
->source_path
);
4409 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4410 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4412 u
->load_state
= UNIT_STUB
;
4414 u
->transient
= true;
4416 unit_add_to_dbus_queue(u
);
4417 unit_add_to_gc_queue(u
);
4419 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4425 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4426 _cleanup_free_
char *comm
= NULL
;
4428 (void) get_process_comm(pid
, &comm
);
4430 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4431 only, like for example systemd's own PAM stub process. */
4432 if (comm
&& comm
[0] == '(')
4435 log_unit_notice(userdata
,
4436 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4439 signal_to_string(sig
));
4444 static int operation_to_signal(const KillContext
*c
, KillOperation k
, bool *noteworthy
) {
4449 case KILL_TERMINATE
:
4450 case KILL_TERMINATE_AND_LOG
:
4451 *noteworthy
= false;
4452 return c
->kill_signal
;
4455 *noteworthy
= false;
4456 return restart_kill_signal(c
);
4460 return c
->final_kill_signal
;
4464 return c
->watchdog_signal
;
4467 assert_not_reached();
4471 int unit_kill_context(
4477 bool main_pid_alien
) {
4479 bool wait_for_exit
= false, send_sighup
;
4480 cg_kill_log_func_t log_func
= NULL
;
4486 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
4487 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
4488 * which is used for user-requested killing of unit processes. */
4490 if (c
->kill_mode
== KILL_NONE
)
4494 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4496 log_func
= log_kill
;
4500 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4505 log_func(main_pid
, sig
, u
);
4507 r
= kill_and_sigcont(main_pid
, sig
);
4508 if (r
< 0 && r
!= -ESRCH
) {
4509 _cleanup_free_
char *comm
= NULL
;
4510 (void) get_process_comm(main_pid
, &comm
);
4512 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4514 if (!main_pid_alien
)
4515 wait_for_exit
= true;
4517 if (r
!= -ESRCH
&& send_sighup
)
4518 (void) kill(main_pid
, SIGHUP
);
4522 if (control_pid
> 0) {
4524 log_func(control_pid
, sig
, u
);
4526 r
= kill_and_sigcont(control_pid
, sig
);
4527 if (r
< 0 && r
!= -ESRCH
) {
4528 _cleanup_free_
char *comm
= NULL
;
4529 (void) get_process_comm(control_pid
, &comm
);
4531 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4533 wait_for_exit
= true;
4535 if (r
!= -ESRCH
&& send_sighup
)
4536 (void) kill(control_pid
, SIGHUP
);
4540 if (u
->cgroup_path
&&
4541 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4542 _cleanup_set_free_ Set
*pid_set
= NULL
;
4544 /* Exclude the main/control pids from being killed via the cgroup */
4545 pid_set
= unit_pid_set(main_pid
, control_pid
);
4549 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4551 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4555 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4556 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
4560 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4561 * we are running in a container or if this is a delegation unit, simply because cgroup
4562 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4563 * of containers it can be confused easily by left-over directories in the cgroup — which
4564 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4565 * there we get proper events. Hence rely on them. */
4567 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4568 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4569 wait_for_exit
= true;
4574 pid_set
= unit_pid_set(main_pid
, control_pid
);
4578 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4587 return wait_for_exit
;
4590 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4596 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these
4597 * paths in the unit (from the path to the UnitDependencyInfo structure indicating how to the
4598 * dependency came to be). However, we build a prefix table for all possible prefixes so that new
4599 * appearing mount units can easily determine which units to make themselves a dependency of. */
4601 if (!path_is_absolute(path
))
4604 if (hashmap_contains(u
->requires_mounts_for
, path
)) /* Exit quickly if the path is already covered. */
4607 _cleanup_free_
char *p
= strdup(path
);
4611 /* Use the canonical form of the path as the stored key. We call path_is_normalized()
4612 * only after simplification, since path_is_normalized() rejects paths with '.'.
4613 * path_is_normalized() also verifies that the path fits in PATH_MAX. */
4614 path
= path_simplify(p
);
4616 if (!path_is_normalized(path
))
4619 UnitDependencyInfo di
= {
4623 r
= hashmap_ensure_put(&u
->requires_mounts_for
, &path_hash_ops
, p
, di
.data
);
4627 TAKE_PTR(p
); /* path remains a valid pointer to the string stored in the hashmap */
4629 char prefix
[strlen(path
) + 1];
4630 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4633 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4635 _cleanup_free_
char *q
= NULL
;
4637 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4649 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4665 int unit_setup_exec_runtime(Unit
*u
) {
4671 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4674 /* Check if there already is an ExecRuntime for this unit? */
4675 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4679 /* Try to get it from somebody else */
4680 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_JOINS_NAMESPACE_OF
) {
4681 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4686 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4689 int unit_setup_dynamic_creds(Unit
*u
) {
4691 DynamicCreds
*dcreds
;
4696 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4698 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4700 ec
= unit_get_exec_context(u
);
4703 if (!ec
->dynamic_user
)
4706 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4709 bool unit_type_supported(UnitType t
) {
4710 if (_unlikely_(t
< 0))
4712 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4715 if (!unit_vtable
[t
]->supported
)
4718 return unit_vtable
[t
]->supported();
4721 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4727 if (!unit_log_level_test(u
, LOG_NOTICE
))
4730 r
= dir_is_empty(where
);
4731 if (r
> 0 || r
== -ENOTDIR
)
4734 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4738 log_unit_struct(u
, LOG_NOTICE
,
4739 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4740 LOG_UNIT_INVOCATION_ID(u
),
4741 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4745 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4746 _cleanup_free_
char *canonical_where
= NULL
;
4752 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
4754 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4758 /* We will happily ignore a trailing slash (or any redundant slashes) */
4759 if (path_equal(where
, canonical_where
))
4762 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4763 log_unit_struct(u
, LOG_ERR
,
4764 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4765 LOG_UNIT_INVOCATION_ID(u
),
4766 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4772 bool unit_is_pristine(Unit
*u
) {
4775 /* Check if the unit already exists or is already around,
4776 * in a number of different ways. Note that to cater for unit
4777 * types such as slice, we are generally fine with units that
4778 * are marked UNIT_LOADED even though nothing was actually
4779 * loaded, as those unit types don't require a file on disk. */
4781 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4784 !strv_isempty(u
->dropin_paths
) ||
4789 pid_t
unit_control_pid(Unit
*u
) {
4792 if (UNIT_VTABLE(u
)->control_pid
)
4793 return UNIT_VTABLE(u
)->control_pid(u
);
4798 pid_t
unit_main_pid(Unit
*u
) {
4801 if (UNIT_VTABLE(u
)->main_pid
)
4802 return UNIT_VTABLE(u
)->main_pid(u
);
4807 static void unit_unref_uid_internal(
4811 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4815 assert(_manager_unref_uid
);
4817 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4818 * gid_t are actually the same time, with the same validity rules.
4820 * Drops a reference to UID/GID from a unit. */
4822 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4823 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4825 if (!uid_is_valid(*ref_uid
))
4828 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4829 *ref_uid
= UID_INVALID
;
4832 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4833 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4836 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4837 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4840 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4843 unit_unref_uid(u
, destroy_now
);
4844 unit_unref_gid(u
, destroy_now
);
4847 static int unit_ref_uid_internal(
4852 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4858 assert(uid_is_valid(uid
));
4859 assert(_manager_ref_uid
);
4861 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4862 * are actually the same type, and have the same validity rules.
4864 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4865 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4868 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4869 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4871 if (*ref_uid
== uid
)
4874 if (uid_is_valid(*ref_uid
)) /* Already set? */
4877 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4885 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4886 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4889 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4890 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4893 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4898 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4900 if (uid_is_valid(uid
)) {
4901 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4906 if (gid_is_valid(gid
)) {
4907 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4910 unit_unref_uid(u
, false);
4916 return r
> 0 || q
> 0;
4919 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4925 c
= unit_get_exec_context(u
);
4927 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4929 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4934 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4939 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4940 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4941 * objects when no service references the UID/GID anymore. */
4943 r
= unit_ref_uid_gid(u
, uid
, gid
);
4945 unit_add_to_dbus_queue(u
);
4948 int unit_acquire_invocation_id(Unit
*u
) {
4954 r
= sd_id128_randomize(&id
);
4956 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
4958 r
= unit_set_invocation_id(u
, id
);
4960 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
4962 unit_add_to_dbus_queue(u
);
4966 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
4972 /* Copy parameters from manager */
4973 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
4977 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
4978 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
4979 p
->prefix
= u
->manager
->prefix
;
4980 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
4982 /* Copy parameters from unit */
4983 p
->cgroup_path
= u
->cgroup_path
;
4984 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
4986 p
->received_credentials
= u
->manager
->received_credentials
;
4991 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
4997 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
4998 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5000 (void) unit_realize_cgroup(u
);
5002 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5006 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
);
5007 (void) ignore_signals(SIGPIPE
);
5009 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5011 if (u
->cgroup_path
) {
5012 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5014 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", empty_to_root(u
->cgroup_path
));
5022 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5029 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5033 int ret
= EXIT_SUCCESS
;
5036 STRV_FOREACH(i
, paths
) {
5037 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5039 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5047 r
= unit_watch_pid(u
, pid
, true);
5055 static void unit_update_dependency_mask(Hashmap
*deps
, Unit
*other
, UnitDependencyInfo di
) {
5059 if (di
.origin_mask
== 0 && di
.destination_mask
== 0)
5060 /* No bit set anymore, let's drop the whole entry */
5061 assert_se(hashmap_remove(deps
, other
));
5063 /* Mask was reduced, let's update the entry */
5064 assert_se(hashmap_update(deps
, other
, di
.data
) == 0);
5067 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5071 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5076 HASHMAP_FOREACH(deps
, u
->dependencies
) {
5080 UnitDependencyInfo di
;
5085 HASHMAP_FOREACH_KEY(di
.data
, other
, deps
) {
5086 Hashmap
*other_deps
;
5088 if (FLAGS_SET(~mask
, di
.origin_mask
))
5091 di
.origin_mask
&= ~mask
;
5092 unit_update_dependency_mask(deps
, other
, di
);
5094 /* We updated the dependency from our unit to the other unit now. But most
5095 * dependencies imply a reverse dependency. Hence, let's delete that one
5096 * too. For that we go through all dependency types on the other unit and
5097 * delete all those which point to us and have the right mask set. */
5099 HASHMAP_FOREACH(other_deps
, other
->dependencies
) {
5100 UnitDependencyInfo dj
;
5102 dj
.data
= hashmap_get(other_deps
, u
);
5103 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5106 dj
.destination_mask
&= ~mask
;
5107 unit_update_dependency_mask(other_deps
, u
, dj
);
5110 unit_add_to_gc_queue(other
);
5120 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5127 if (MANAGER_IS_SYSTEM(u
->manager
))
5128 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5130 _cleanup_free_
char *user_path
= NULL
;
5131 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5134 p
= strjoin(user_path
, u
->id
);
5144 static int unit_export_invocation_id(Unit
*u
) {
5145 _cleanup_free_
char *p
= NULL
;
5150 if (u
->exported_invocation_id
)
5153 if (sd_id128_is_null(u
->invocation_id
))
5156 r
= unit_get_invocation_path(u
, &p
);
5158 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5160 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5162 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5164 u
->exported_invocation_id
= true;
5168 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5176 if (u
->exported_log_level_max
)
5179 if (c
->log_level_max
< 0)
5182 assert(c
->log_level_max
<= 7);
5184 buf
[0] = '0' + c
->log_level_max
;
5187 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5188 r
= symlink_atomic(buf
, p
);
5190 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5192 u
->exported_log_level_max
= true;
5196 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5197 _cleanup_close_
int fd
= -1;
5198 struct iovec
*iovec
;
5205 if (u
->exported_log_extra_fields
)
5208 if (c
->n_log_extra_fields
<= 0)
5211 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5212 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5214 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5215 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5217 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5218 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5221 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5222 pattern
= strjoina(p
, ".XXXXXX");
5224 fd
= mkostemp_safe(pattern
);
5226 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5228 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5230 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5234 (void) fchmod(fd
, 0644);
5236 if (rename(pattern
, p
) < 0) {
5237 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5241 u
->exported_log_extra_fields
= true;
5245 (void) unlink(pattern
);
5249 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5250 _cleanup_free_
char *buf
= NULL
;
5257 if (u
->exported_log_ratelimit_interval
)
5260 if (c
->log_ratelimit_interval_usec
== 0)
5263 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5265 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5268 r
= symlink_atomic(buf
, p
);
5270 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5272 u
->exported_log_ratelimit_interval
= true;
5276 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5277 _cleanup_free_
char *buf
= NULL
;
5284 if (u
->exported_log_ratelimit_burst
)
5287 if (c
->log_ratelimit_burst
== 0)
5290 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5292 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5295 r
= symlink_atomic(buf
, p
);
5297 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5299 u
->exported_log_ratelimit_burst
= true;
5303 void unit_export_state_files(Unit
*u
) {
5304 const ExecContext
*c
;
5311 if (MANAGER_IS_TEST_RUN(u
->manager
))
5314 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5315 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5316 * the IPC system itself and PID 1 also log to the journal.
5318 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5319 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5320 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5321 * namespace at least.
5323 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5324 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5327 (void) unit_export_invocation_id(u
);
5329 if (!MANAGER_IS_SYSTEM(u
->manager
))
5332 c
= unit_get_exec_context(u
);
5334 (void) unit_export_log_level_max(u
, c
);
5335 (void) unit_export_log_extra_fields(u
, c
);
5336 (void) unit_export_log_ratelimit_interval(u
, c
);
5337 (void) unit_export_log_ratelimit_burst(u
, c
);
5341 void unit_unlink_state_files(Unit
*u
) {
5349 /* Undoes the effect of unit_export_state() */
5351 if (u
->exported_invocation_id
) {
5352 _cleanup_free_
char *invocation_path
= NULL
;
5353 int r
= unit_get_invocation_path(u
, &invocation_path
);
5355 (void) unlink(invocation_path
);
5356 u
->exported_invocation_id
= false;
5360 if (!MANAGER_IS_SYSTEM(u
->manager
))
5363 if (u
->exported_log_level_max
) {
5364 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5367 u
->exported_log_level_max
= false;
5370 if (u
->exported_log_extra_fields
) {
5371 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5374 u
->exported_log_extra_fields
= false;
5377 if (u
->exported_log_ratelimit_interval
) {
5378 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5381 u
->exported_log_ratelimit_interval
= false;
5384 if (u
->exported_log_ratelimit_burst
) {
5385 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5388 u
->exported_log_ratelimit_burst
= false;
5392 int unit_prepare_exec(Unit
*u
) {
5397 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5398 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5399 r
= bpf_firewall_load_custom(u
);
5403 /* Prepares everything so that we can fork of a process for this unit */
5405 (void) unit_realize_cgroup(u
);
5407 if (u
->reset_accounting
) {
5408 (void) unit_reset_accounting(u
);
5409 u
->reset_accounting
= false;
5412 unit_export_state_files(u
);
5414 r
= unit_setup_exec_runtime(u
);
5418 r
= unit_setup_dynamic_creds(u
);
5425 static bool ignore_leftover_process(const char *comm
) {
5426 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5429 int unit_log_leftover_process_start(pid_t pid
, int sig
, void *userdata
) {
5430 _cleanup_free_
char *comm
= NULL
;
5432 (void) get_process_comm(pid
, &comm
);
5434 if (ignore_leftover_process(comm
))
5437 /* During start we print a warning */
5439 log_unit_warning(userdata
,
5440 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5441 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5447 int unit_log_leftover_process_stop(pid_t pid
, int sig
, void *userdata
) {
5448 _cleanup_free_
char *comm
= NULL
;
5450 (void) get_process_comm(pid
, &comm
);
5452 if (ignore_leftover_process(comm
))
5455 /* During stop we only print an informational message */
5457 log_unit_info(userdata
,
5458 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
5464 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
5467 (void) unit_pick_cgroup_path(u
);
5469 if (!u
->cgroup_path
)
5472 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_func
, u
);
5475 bool unit_needs_console(Unit
*u
) {
5477 UnitActiveState state
;
5481 state
= unit_active_state(u
);
5483 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5486 if (UNIT_VTABLE(u
)->needs_console
)
5487 return UNIT_VTABLE(u
)->needs_console(u
);
5489 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5490 ec
= unit_get_exec_context(u
);
5494 return exec_context_may_touch_console(ec
);
5497 const char *unit_label_path(const Unit
*u
) {
5502 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
5503 * when validating access checks. */
5505 if (IN_SET(u
->load_state
, UNIT_MASKED
, UNIT_NOT_FOUND
, UNIT_MERGED
))
5506 return NULL
; /* Shortcut things if we know there is no real, relevant unit file around */
5508 p
= u
->source_path
?: u
->fragment_path
;
5512 if (IN_SET(u
->load_state
, UNIT_LOADED
, UNIT_BAD_SETTING
, UNIT_ERROR
))
5513 return p
; /* Shortcut things, if we successfully loaded at least some stuff from the unit file */
5515 /* Not loaded yet, we need to go to disk */
5516 assert(u
->load_state
== UNIT_STUB
);
5518 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
5519 if (null_or_empty_path(p
) > 0)
5525 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5530 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5531 * and not a kernel thread either */
5533 /* First, a simple range check */
5534 if (!pid_is_valid(pid
))
5535 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5537 /* Some extra safety check */
5538 if (pid
== 1 || pid
== getpid_cached())
5539 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5541 /* Don't even begin to bother with kernel threads */
5542 r
= is_kernel_thread(pid
);
5544 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5546 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5548 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5553 void unit_log_success(Unit
*u
) {
5556 /* Let's show message "Deactivated successfully" in debug mode (when manager is user) rather than in info mode.
5557 * This message has low information value for regular users and it might be a bit overwhelming on a system with
5558 * a lot of devices. */
5560 MANAGER_IS_USER(u
->manager
) ? LOG_DEBUG
: LOG_INFO
,
5561 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5562 LOG_UNIT_INVOCATION_ID(u
),
5563 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
5566 void unit_log_failure(Unit
*u
, const char *result
) {
5570 log_unit_struct(u
, LOG_WARNING
,
5571 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5572 LOG_UNIT_INVOCATION_ID(u
),
5573 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5574 "UNIT_RESULT=%s", result
);
5577 void unit_log_skip(Unit
*u
, const char *result
) {
5581 log_unit_struct(u
, LOG_INFO
,
5582 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5583 LOG_UNIT_INVOCATION_ID(u
),
5584 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5585 "UNIT_RESULT=%s", result
);
5588 void unit_log_process_exit(
5591 const char *command
,
5601 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5602 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5603 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5607 else if (code
== CLD_EXITED
)
5610 level
= LOG_WARNING
;
5612 log_unit_struct(u
, level
,
5613 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5614 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s%s",
5616 sigchld_code_to_string(code
), status
,
5617 strna(code
== CLD_EXITED
5618 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5619 : signal_to_string(status
)),
5620 success
? " (success)" : ""),
5621 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5622 "EXIT_STATUS=%i", status
,
5623 "COMMAND=%s", strna(command
),
5624 LOG_UNIT_INVOCATION_ID(u
));
5627 int unit_exit_status(Unit
*u
) {
5630 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5631 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5632 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5633 * service process has exited abnormally (signal/coredump). */
5635 if (!UNIT_VTABLE(u
)->exit_status
)
5638 return UNIT_VTABLE(u
)->exit_status(u
);
5641 int unit_failure_action_exit_status(Unit
*u
) {
5646 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5648 if (u
->failure_action_exit_status
>= 0)
5649 return u
->failure_action_exit_status
;
5651 r
= unit_exit_status(u
);
5652 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5658 int unit_success_action_exit_status(Unit
*u
) {
5663 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5665 if (u
->success_action_exit_status
>= 0)
5666 return u
->success_action_exit_status
;
5668 r
= unit_exit_status(u
);
5669 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5675 int unit_test_trigger_loaded(Unit
*u
) {
5678 /* Tests whether the unit to trigger is loaded */
5680 trigger
= UNIT_TRIGGER(u
);
5682 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5683 "Refusing to start, no unit to trigger.");
5684 if (trigger
->load_state
!= UNIT_LOADED
)
5685 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5686 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
5691 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
5695 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
||
5696 (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
&& !unit_will_restart(u
)))
5697 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
5699 exec_context_destroy_credentials(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], u
->id
);
5702 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
5703 UnitActiveState state
;
5707 /* Special return values:
5709 * -EOPNOTSUPP → cleaning not supported for this unit type
5710 * -EUNATCH → cleaning not defined for this resource type
5711 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
5712 * a job queued or similar
5715 if (!UNIT_VTABLE(u
)->clean
)
5721 if (u
->load_state
!= UNIT_LOADED
)
5727 state
= unit_active_state(u
);
5728 if (!IN_SET(state
, UNIT_INACTIVE
))
5731 return UNIT_VTABLE(u
)->clean(u
, mask
);
5734 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
5737 if (!UNIT_VTABLE(u
)->clean
||
5738 u
->load_state
!= UNIT_LOADED
) {
5743 /* When the clean() method is set, can_clean() really should be set too */
5744 assert(UNIT_VTABLE(u
)->can_clean
);
5746 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
5749 bool unit_can_freeze(Unit
*u
) {
5752 if (UNIT_VTABLE(u
)->can_freeze
)
5753 return UNIT_VTABLE(u
)->can_freeze(u
);
5755 return UNIT_VTABLE(u
)->freeze
;
5758 void unit_frozen(Unit
*u
) {
5761 u
->freezer_state
= FREEZER_FROZEN
;
5763 bus_unit_send_pending_freezer_message(u
);
5766 void unit_thawed(Unit
*u
) {
5769 u
->freezer_state
= FREEZER_RUNNING
;
5771 bus_unit_send_pending_freezer_message(u
);
5774 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
5776 int (*method
)(Unit
*);
5780 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
5782 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
5783 if (!method
|| !cg_freezer_supported())
5789 if (u
->load_state
!= UNIT_LOADED
)
5792 s
= unit_active_state(u
);
5793 if (s
!= UNIT_ACTIVE
)
5796 if (IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
))
5806 int unit_freeze(Unit
*u
) {
5807 return unit_freezer_action(u
, FREEZER_FREEZE
);
5810 int unit_thaw(Unit
*u
) {
5811 return unit_freezer_action(u
, FREEZER_THAW
);
5814 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
5815 int unit_freeze_vtable_common(Unit
*u
) {
5816 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
5819 int unit_thaw_vtable_common(Unit
*u
) {
5820 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
5823 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5824 [COLLECT_INACTIVE
] = "inactive",
5825 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5828 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);
5830 Unit
* unit_has_dependency(const Unit
*u
, UnitDependencyAtom atom
, Unit
*other
) {
5835 /* Checks if the unit has a dependency on 'other' with the specified dependency atom. If 'other' is
5836 * NULL checks if the unit has *any* dependency of that atom. Returns 'other' if found (or if 'other'
5837 * is NULL the first entry found), or NULL if not found. */
5839 UNIT_FOREACH_DEPENDENCY(i
, u
, atom
)
5840 if (!other
|| other
== i
)
5846 int unit_get_dependency_array(const Unit
*u
, UnitDependencyAtom atom
, Unit
***ret_array
) {
5847 _cleanup_free_ Unit
**array
= NULL
;
5854 /* Gets a list of units matching a specific atom as array. This is useful when iterating through
5855 * dependencies while modifying them: the array is an "atomic snapshot" of sorts, that can be read
5856 * while the dependency table is continuously updated. */
5858 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
5859 if (!GREEDY_REALLOC(array
, n
+ 1))
5865 *ret_array
= TAKE_PTR(array
);
5867 assert(n
<= INT_MAX
);