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"
17 #include "bus-internal.h"
19 #include "cgroup-setup.h"
20 #include "cgroup-util.h"
22 #include "core-varlink.h"
23 #include "dbus-unit.h"
28 #include "exec-credential.h"
31 #include "fileio-label.h"
33 #include "format-util.h"
34 #include "id128-util.h"
37 #include "label-util.h"
38 #include "load-dropin.h"
39 #include "load-fragment.h"
41 #include "logarithm.h"
43 #include "mkdir-label.h"
44 #include "path-util.h"
45 #include "process-util.h"
47 #include "serialize.h"
49 #include "signal-util.h"
50 #include "sparse-endian.h"
52 #include "specifier.h"
53 #include "stat-util.h"
54 #include "stdio-util.h"
55 #include "string-table.h"
56 #include "string-util.h"
58 #include "terminal-util.h"
59 #include "tmpfile-util.h"
60 #include "umask-util.h"
61 #include "unit-name.h"
63 #include "user-util.h"
69 /* Thresholds for logging at INFO level about resource consumption */
70 #define MENTIONWORTHY_CPU_NSEC (1 * NSEC_PER_SEC)
71 #define MENTIONWORTHY_IO_BYTES (1024 * 1024ULL)
72 #define MENTIONWORTHY_IP_BYTES (0ULL)
74 /* Thresholds for logging at INFO level about resource consumption */
75 #define NOTICEWORTHY_CPU_NSEC (10*60 * NSEC_PER_SEC) /* 10 minutes */
76 #define NOTICEWORTHY_IO_BYTES (10 * 1024 * 1024ULL) /* 10 MB */
77 #define NOTICEWORTHY_IP_BYTES (128 * 1024 * 1024ULL) /* 128 MB */
79 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
80 [UNIT_SERVICE
] = &service_vtable
,
81 [UNIT_SOCKET
] = &socket_vtable
,
82 [UNIT_TARGET
] = &target_vtable
,
83 [UNIT_DEVICE
] = &device_vtable
,
84 [UNIT_MOUNT
] = &mount_vtable
,
85 [UNIT_AUTOMOUNT
] = &automount_vtable
,
86 [UNIT_SWAP
] = &swap_vtable
,
87 [UNIT_TIMER
] = &timer_vtable
,
88 [UNIT_PATH
] = &path_vtable
,
89 [UNIT_SLICE
] = &slice_vtable
,
90 [UNIT_SCOPE
] = &scope_vtable
,
93 Unit
* unit_new(Manager
*m
, size_t size
) {
97 assert(size
>= sizeof(Unit
));
104 u
->type
= _UNIT_TYPE_INVALID
;
105 u
->default_dependencies
= true;
106 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
107 u
->unit_file_preset
= -1;
108 u
->on_failure_job_mode
= JOB_REPLACE
;
109 u
->on_success_job_mode
= JOB_FAIL
;
110 u
->cgroup_control_inotify_wd
= -1;
111 u
->cgroup_memory_inotify_wd
= -1;
112 u
->job_timeout
= USEC_INFINITY
;
113 u
->job_running_timeout
= USEC_INFINITY
;
114 u
->ref_uid
= UID_INVALID
;
115 u
->ref_gid
= GID_INVALID
;
116 u
->cpu_usage_last
= NSEC_INFINITY
;
117 u
->cgroup_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
118 u
->failure_action_exit_status
= u
->success_action_exit_status
= -1;
120 u
->ip_accounting_ingress_map_fd
= -EBADF
;
121 u
->ip_accounting_egress_map_fd
= -EBADF
;
122 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++)
123 u
->io_accounting_last
[i
] = UINT64_MAX
;
125 u
->ipv4_allow_map_fd
= -EBADF
;
126 u
->ipv6_allow_map_fd
= -EBADF
;
127 u
->ipv4_deny_map_fd
= -EBADF
;
128 u
->ipv6_deny_map_fd
= -EBADF
;
130 u
->last_section_private
= -1;
132 u
->start_ratelimit
= (RateLimit
) {
133 m
->defaults
.start_limit_interval
,
134 m
->defaults
.start_limit_burst
137 u
->auto_start_stop_ratelimit
= (const RateLimit
) {
145 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
146 _cleanup_(unit_freep
) Unit
*u
= NULL
;
149 u
= unit_new(m
, size
);
153 r
= unit_add_name(u
, name
);
162 bool unit_has_name(const Unit
*u
, const char *name
) {
166 return streq_ptr(name
, u
->id
) ||
167 set_contains(u
->aliases
, name
);
170 static void unit_init(Unit
*u
) {
177 assert(u
->type
>= 0);
179 cc
= unit_get_cgroup_context(u
);
181 cgroup_context_init(cc
);
183 /* Copy in the manager defaults into the cgroup
184 * context, _before_ the rest of the settings have
185 * been initialized */
187 cc
->cpu_accounting
= u
->manager
->defaults
.cpu_accounting
;
188 cc
->io_accounting
= u
->manager
->defaults
.io_accounting
;
189 cc
->blockio_accounting
= u
->manager
->defaults
.blockio_accounting
;
190 cc
->memory_accounting
= u
->manager
->defaults
.memory_accounting
;
191 cc
->tasks_accounting
= u
->manager
->defaults
.tasks_accounting
;
192 cc
->ip_accounting
= u
->manager
->defaults
.ip_accounting
;
194 if (u
->type
!= UNIT_SLICE
)
195 cc
->tasks_max
= u
->manager
->defaults
.tasks_max
;
197 cc
->memory_pressure_watch
= u
->manager
->defaults
.memory_pressure_watch
;
198 cc
->memory_pressure_threshold_usec
= u
->manager
->defaults
.memory_pressure_threshold_usec
;
201 ec
= unit_get_exec_context(u
);
203 exec_context_init(ec
);
205 if (u
->manager
->defaults
.oom_score_adjust_set
) {
206 ec
->oom_score_adjust
= u
->manager
->defaults
.oom_score_adjust
;
207 ec
->oom_score_adjust_set
= true;
210 if (MANAGER_IS_SYSTEM(u
->manager
))
211 ec
->keyring_mode
= EXEC_KEYRING_SHARED
;
213 ec
->keyring_mode
= EXEC_KEYRING_INHERIT
;
215 /* User manager might have its umask redefined by PAM or UMask=. In this
216 * case let the units it manages inherit this value by default. They can
217 * still tune this value through their own unit file */
218 (void) get_process_umask(0, &ec
->umask
);
222 kc
= unit_get_kill_context(u
);
224 kill_context_init(kc
);
226 if (UNIT_VTABLE(u
)->init
)
227 UNIT_VTABLE(u
)->init(u
);
230 static int unit_add_alias(Unit
*u
, char *donated_name
) {
233 /* Make sure that u->names is allocated. We may leave u->names
234 * empty if we fail later, but this is not a problem. */
235 r
= set_ensure_put(&u
->aliases
, &string_hash_ops
, donated_name
);
243 int unit_add_name(Unit
*u
, const char *text
) {
244 _cleanup_free_
char *name
= NULL
, *instance
= NULL
;
251 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
253 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
254 "instance is not set when adding name '%s': %m", text
);
256 r
= unit_name_replace_instance(text
, u
->instance
, &name
);
258 return log_unit_debug_errno(u
, r
,
259 "failed to build instance name from '%s': %m", text
);
266 if (unit_has_name(u
, name
))
269 if (hashmap_contains(u
->manager
->units
, name
))
270 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
271 "unit already exist when adding name '%s': %m", name
);
273 if (!unit_name_is_valid(name
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
274 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
275 "name '%s' is invalid: %m", name
);
277 t
= unit_name_to_type(name
);
279 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
280 "failed to derive unit type from name '%s': %m", name
);
282 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
283 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
284 "unit type is illegal: u->type(%d) and t(%d) for name '%s': %m",
287 r
= unit_name_to_instance(name
, &instance
);
289 return log_unit_debug_errno(u
, r
, "failed to extract instance from name '%s': %m", name
);
291 if (instance
&& !unit_type_may_template(t
))
292 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
), "templates are not allowed for name '%s': %m", name
);
294 /* Ensure that this unit either has no instance, or that the instance matches. */
295 if (u
->type
!= _UNIT_TYPE_INVALID
&& !streq_ptr(u
->instance
, instance
))
296 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
297 "cannot add name %s, the instances don't match (\"%s\" != \"%s\").",
298 name
, instance
, u
->instance
);
300 if (u
->id
&& !unit_type_may_alias(t
))
301 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
302 "cannot add name %s, aliases are not allowed for %s units.",
303 name
, unit_type_to_string(t
));
305 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
306 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(E2BIG
), "cannot add name, manager has too many units: %m");
308 /* Add name to the global hashmap first, because that's easier to undo */
309 r
= hashmap_put(u
->manager
->units
, name
, u
);
311 return log_unit_debug_errno(u
, r
, "add unit to hashmap failed for name '%s': %m", text
);
314 r
= unit_add_alias(u
, name
); /* unit_add_alias() takes ownership of the name on success */
316 hashmap_remove(u
->manager
->units
, name
);
322 /* A new name, we don't need the set yet. */
323 assert(u
->type
== _UNIT_TYPE_INVALID
);
324 assert(!u
->instance
);
327 u
->id
= TAKE_PTR(name
);
328 u
->instance
= TAKE_PTR(instance
);
330 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
334 unit_add_to_dbus_queue(u
);
338 int unit_choose_id(Unit
*u
, const char *name
) {
339 _cleanup_free_
char *t
= NULL
;
346 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
350 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
357 if (streq_ptr(u
->id
, name
))
358 return 0; /* Nothing to do. */
360 /* Selects one of the aliases of this unit as the id */
361 s
= set_get(u
->aliases
, (char*) name
);
366 r
= set_remove_and_put(u
->aliases
, name
, u
->id
);
370 assert_se(set_remove(u
->aliases
, name
)); /* see set_get() above… */
372 u
->id
= s
; /* Old u->id is now stored in the set, and s is not stored anywhere */
373 unit_add_to_dbus_queue(u
);
378 int unit_set_description(Unit
*u
, const char *description
) {
383 r
= free_and_strdup(&u
->description
, empty_to_null(description
));
387 unit_add_to_dbus_queue(u
);
392 static bool unit_success_failure_handler_has_jobs(Unit
*unit
) {
395 UNIT_FOREACH_DEPENDENCY(other
, unit
, UNIT_ATOM_ON_SUCCESS
)
396 if (other
->job
|| other
->nop_job
)
399 UNIT_FOREACH_DEPENDENCY(other
, unit
, UNIT_ATOM_ON_FAILURE
)
400 if (other
->job
|| other
->nop_job
)
406 void unit_release_resources(Unit
*u
) {
407 UnitActiveState state
;
412 if (u
->job
|| u
->nop_job
)
418 state
= unit_active_state(u
);
419 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
422 if (unit_will_restart(u
))
425 ec
= unit_get_exec_context(u
);
426 if (ec
&& ec
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
)
427 exec_context_destroy_runtime_directory(ec
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
429 if (UNIT_VTABLE(u
)->release_resources
)
430 UNIT_VTABLE(u
)->release_resources(u
);
433 bool unit_may_gc(Unit
*u
) {
434 UnitActiveState state
;
439 /* Checks whether the unit is ready to be unloaded for garbage collection. Returns true when the
440 * unit may be collected, and false if there's some reason to keep it loaded.
442 * References from other units are *not* checked here. Instead, this is done in unit_gc_sweep(), but
443 * using markers to properly collect dependency loops.
446 if (u
->job
|| u
->nop_job
)
452 /* if we saw a cgroup empty event for this unit, stay around until we processed it so that we remove
453 * the empty cgroup if possible. Similar, process any pending OOM events if they are already queued
454 * before we release the unit. */
455 if (u
->in_cgroup_empty_queue
|| u
->in_cgroup_oom_queue
)
458 /* Make sure to send out D-Bus events before we unload the unit */
459 if (u
->in_dbus_queue
)
462 if (sd_bus_track_count(u
->bus_track
) > 0)
465 state
= unit_active_state(u
);
467 /* But we keep the unit object around for longer when it is referenced or configured to not be
469 switch (u
->collect_mode
) {
471 case COLLECT_INACTIVE
:
472 if (state
!= UNIT_INACTIVE
)
477 case COLLECT_INACTIVE_OR_FAILED
:
478 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
484 assert_not_reached();
487 /* Check if any OnFailure= or on Success= jobs may be pending */
488 if (unit_success_failure_handler_has_jobs(u
))
491 if (u
->cgroup_path
) {
492 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
493 * around. Units with active processes should never be collected. */
495 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
497 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", empty_to_root(u
->cgroup_path
));
502 if (!UNIT_VTABLE(u
)->may_gc
)
505 return UNIT_VTABLE(u
)->may_gc(u
);
508 void unit_add_to_load_queue(Unit
*u
) {
510 assert(u
->type
!= _UNIT_TYPE_INVALID
);
512 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
515 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
516 u
->in_load_queue
= true;
519 void unit_add_to_cleanup_queue(Unit
*u
) {
522 if (u
->in_cleanup_queue
)
525 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
526 u
->in_cleanup_queue
= true;
529 void unit_add_to_gc_queue(Unit
*u
) {
532 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
538 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
539 u
->in_gc_queue
= true;
542 void unit_add_to_dbus_queue(Unit
*u
) {
544 assert(u
->type
!= _UNIT_TYPE_INVALID
);
546 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
549 /* Shortcut things if nobody cares */
550 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
551 sd_bus_track_count(u
->bus_track
) <= 0 &&
552 set_isempty(u
->manager
->private_buses
)) {
553 u
->sent_dbus_new_signal
= true;
557 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
558 u
->in_dbus_queue
= true;
561 void unit_submit_to_stop_when_unneeded_queue(Unit
*u
) {
564 if (u
->in_stop_when_unneeded_queue
)
567 if (!u
->stop_when_unneeded
)
570 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
573 LIST_PREPEND(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
574 u
->in_stop_when_unneeded_queue
= true;
577 void unit_submit_to_start_when_upheld_queue(Unit
*u
) {
580 if (u
->in_start_when_upheld_queue
)
583 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)))
586 if (!unit_has_dependency(u
, UNIT_ATOM_START_STEADILY
, NULL
))
589 LIST_PREPEND(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
590 u
->in_start_when_upheld_queue
= true;
593 void unit_submit_to_stop_when_bound_queue(Unit
*u
) {
596 if (u
->in_stop_when_bound_queue
)
599 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
602 if (!unit_has_dependency(u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
, NULL
))
605 LIST_PREPEND(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
606 u
->in_stop_when_bound_queue
= true;
609 static bool unit_can_release_resources(Unit
*u
) {
614 if (UNIT_VTABLE(u
)->release_resources
)
617 ec
= unit_get_exec_context(u
);
618 if (ec
&& ec
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
)
624 void unit_submit_to_release_resources_queue(Unit
*u
) {
627 if (u
->in_release_resources_queue
)
630 if (u
->job
|| u
->nop_job
)
636 if (!unit_can_release_resources(u
))
639 LIST_PREPEND(release_resources_queue
, u
->manager
->release_resources_queue
, u
);
640 u
->in_release_resources_queue
= true;
643 static void unit_clear_dependencies(Unit
*u
) {
646 /* Removes all dependencies configured on u and their reverse dependencies. */
648 for (Hashmap
*deps
; (deps
= hashmap_steal_first(u
->dependencies
));) {
650 for (Unit
*other
; (other
= hashmap_steal_first_key(deps
));) {
653 HASHMAP_FOREACH(other_deps
, other
->dependencies
)
654 hashmap_remove(other_deps
, u
);
656 unit_add_to_gc_queue(other
);
662 u
->dependencies
= hashmap_free(u
->dependencies
);
665 static void unit_remove_transient(Unit
*u
) {
671 if (u
->fragment_path
)
672 (void) unlink(u
->fragment_path
);
674 STRV_FOREACH(i
, u
->dropin_paths
) {
675 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
677 if (path_extract_directory(*i
, &p
) < 0) /* Get the drop-in directory from the drop-in file */
680 if (path_extract_directory(p
, &pp
) < 0) /* Get the config directory from the drop-in directory */
683 /* Only drop transient drop-ins */
684 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
692 static void unit_free_requires_mounts_for(Unit
*u
) {
696 _cleanup_free_
char *path
= NULL
;
698 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
702 char s
[strlen(path
) + 1];
704 PATH_FOREACH_PREFIX_MORE(s
, path
) {
708 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
712 (void) set_remove(x
, u
);
714 if (set_isempty(x
)) {
715 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
723 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
726 static void unit_done(Unit
*u
) {
735 if (UNIT_VTABLE(u
)->done
)
736 UNIT_VTABLE(u
)->done(u
);
738 ec
= unit_get_exec_context(u
);
740 exec_context_done(ec
);
742 cc
= unit_get_cgroup_context(u
);
744 cgroup_context_done(cc
);
747 Unit
* unit_free(Unit
*u
) {
754 sd_event_source_disable_unref(u
->auto_start_stop_event_source
);
756 u
->transient_file
= safe_fclose(u
->transient_file
);
758 if (!MANAGER_IS_RELOADING(u
->manager
))
759 unit_remove_transient(u
);
761 bus_unit_send_removed_signal(u
);
765 unit_dequeue_rewatch_pids(u
);
767 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
768 u
->bus_track
= sd_bus_track_unref(u
->bus_track
);
769 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
770 u
->pending_freezer_invocation
= sd_bus_message_unref(u
->pending_freezer_invocation
);
772 unit_free_requires_mounts_for(u
);
774 SET_FOREACH(t
, u
->aliases
)
775 hashmap_remove_value(u
->manager
->units
, t
, u
);
777 hashmap_remove_value(u
->manager
->units
, u
->id
, u
);
779 if (!sd_id128_is_null(u
->invocation_id
))
780 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
794 /* A unit is being dropped from the tree, make sure our family is realized properly. Do this after we
795 * detach the unit from slice tree in order to eliminate its effect on controller masks. */
796 slice
= UNIT_GET_SLICE(u
);
797 unit_clear_dependencies(u
);
799 unit_add_family_to_cgroup_realize_queue(slice
);
802 manager_unref_console(u
->manager
);
804 fdset_free(u
->initial_socket_bind_link_fds
);
806 bpf_link_free(u
->ipv4_socket_bind_link
);
807 bpf_link_free(u
->ipv6_socket_bind_link
);
810 unit_release_cgroup(u
);
812 if (!MANAGER_IS_RELOADING(u
->manager
))
813 unit_unlink_state_files(u
);
815 unit_unref_uid_gid(u
, false);
817 (void) manager_update_failed_units(u
->manager
, u
, false);
818 set_remove(u
->manager
->startup_units
, u
);
820 unit_unwatch_all_pids(u
);
822 while (u
->refs_by_target
)
823 unit_ref_unset(u
->refs_by_target
);
825 if (u
->type
!= _UNIT_TYPE_INVALID
)
826 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
828 if (u
->in_load_queue
)
829 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
831 if (u
->in_dbus_queue
)
832 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
834 if (u
->in_cleanup_queue
)
835 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
838 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
840 if (u
->in_cgroup_realize_queue
)
841 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
843 if (u
->in_cgroup_empty_queue
)
844 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
846 if (u
->in_cgroup_oom_queue
)
847 LIST_REMOVE(cgroup_oom_queue
, u
->manager
->cgroup_oom_queue
, u
);
849 if (u
->in_target_deps_queue
)
850 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
852 if (u
->in_stop_when_unneeded_queue
)
853 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
855 if (u
->in_start_when_upheld_queue
)
856 LIST_REMOVE(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
858 if (u
->in_stop_when_bound_queue
)
859 LIST_REMOVE(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
861 if (u
->in_release_resources_queue
)
862 LIST_REMOVE(release_resources_queue
, u
->manager
->release_resources_queue
, u
);
864 bpf_firewall_close(u
);
866 hashmap_free(u
->bpf_foreign_by_key
);
868 bpf_program_free(u
->bpf_device_control_installed
);
871 bpf_link_free(u
->restrict_ifaces_ingress_bpf_link
);
872 bpf_link_free(u
->restrict_ifaces_egress_bpf_link
);
874 fdset_free(u
->initial_restric_ifaces_link_fds
);
876 condition_free_list(u
->conditions
);
877 condition_free_list(u
->asserts
);
879 free(u
->description
);
880 strv_free(u
->documentation
);
881 free(u
->fragment_path
);
882 free(u
->source_path
);
883 strv_free(u
->dropin_paths
);
886 free(u
->job_timeout_reboot_arg
);
889 free(u
->access_selinux_context
);
891 set_free_free(u
->aliases
);
894 activation_details_unref(u
->activation_details
);
899 FreezerState
unit_freezer_state(Unit
*u
) {
902 return u
->freezer_state
;
905 int unit_freezer_state_kernel(Unit
*u
, FreezerState
*ret
) {
906 char *values
[1] = {};
911 r
= cg_get_keyed_attribute(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events",
912 STRV_MAKE("frozen"), values
);
916 r
= _FREEZER_STATE_INVALID
;
919 if (streq(values
[0], "0"))
921 else if (streq(values
[0], "1"))
931 UnitActiveState
unit_active_state(Unit
*u
) {
934 if (u
->load_state
== UNIT_MERGED
)
935 return unit_active_state(unit_follow_merge(u
));
937 /* After a reload it might happen that a unit is not correctly
938 * loaded but still has a process around. That's why we won't
939 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
941 return UNIT_VTABLE(u
)->active_state(u
);
944 const char* unit_sub_state_to_string(Unit
*u
) {
947 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
950 static int unit_merge_names(Unit
*u
, Unit
*other
) {
957 r
= unit_add_alias(u
, other
->id
);
961 r
= set_move(u
->aliases
, other
->aliases
);
963 set_remove(u
->aliases
, other
->id
);
968 other
->aliases
= set_free_free(other
->aliases
);
970 SET_FOREACH(name
, u
->aliases
)
971 assert_se(hashmap_replace(u
->manager
->units
, name
, u
) == 0);
976 static int unit_reserve_dependencies(Unit
*u
, Unit
*other
) {
985 /* Let's reserve some space in the dependency hashmaps so that later on merging the units cannot
988 * First make some room in the per dependency type hashmaps. Using the summed size of both units'
989 * hashmaps is an estimate that is likely too high since they probably use some of the same
990 * types. But it's never too low, and that's all we need. */
992 n_reserve
= MIN(hashmap_size(other
->dependencies
), LESS_BY((size_t) _UNIT_DEPENDENCY_MAX
, hashmap_size(u
->dependencies
)));
994 r
= hashmap_ensure_allocated(&u
->dependencies
, NULL
);
998 r
= hashmap_reserve(u
->dependencies
, n_reserve
);
1003 /* Now, enlarge our per dependency type hashmaps by the number of entries in the same hashmap of the
1004 * other unit's dependencies.
1006 * NB: If u does not have a dependency set allocated for some dependency type, there is no need to
1007 * reserve anything for. In that case other's set will be transferred as a whole to u by
1008 * complete_move(). */
1010 HASHMAP_FOREACH_KEY(deps
, d
, u
->dependencies
) {
1011 Hashmap
*other_deps
;
1013 other_deps
= hashmap_get(other
->dependencies
, d
);
1015 r
= hashmap_reserve(deps
, hashmap_size(other_deps
));
1023 static bool unit_should_warn_about_dependency(UnitDependency dependency
) {
1024 /* Only warn about some unit types */
1025 return IN_SET(dependency
,
1036 static int unit_per_dependency_type_hashmap_update(
1039 UnitDependencyMask origin_mask
,
1040 UnitDependencyMask destination_mask
) {
1042 UnitDependencyInfo info
;
1046 assert_cc(sizeof(void*) == sizeof(info
));
1048 /* Acquire the UnitDependencyInfo entry for the Unit* we are interested in, and update it if it
1049 * exists, or insert it anew if not. */
1051 info
.data
= hashmap_get(per_type
, other
);
1053 /* Entry already exists. Add in our mask. */
1055 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
1056 FLAGS_SET(destination_mask
, info
.destination_mask
))
1059 info
.origin_mask
|= origin_mask
;
1060 info
.destination_mask
|= destination_mask
;
1062 r
= hashmap_update(per_type
, other
, info
.data
);
1064 info
= (UnitDependencyInfo
) {
1065 .origin_mask
= origin_mask
,
1066 .destination_mask
= destination_mask
,
1069 r
= hashmap_put(per_type
, other
, info
.data
);
1077 static void unit_merge_dependencies(Unit
*u
, Unit
*other
) {
1079 void *dt
; /* Actually of type UnitDependency, except that we don't bother casting it here,
1080 * since the hashmaps all want it as void pointer. */
1088 /* First, remove dependency to other. */
1089 HASHMAP_FOREACH_KEY(deps
, dt
, u
->dependencies
) {
1090 if (hashmap_remove(deps
, other
) && unit_should_warn_about_dependency(UNIT_DEPENDENCY_FROM_PTR(dt
)))
1091 log_unit_warning(u
, "Dependency %s=%s is dropped, as %s is merged into %s.",
1092 unit_dependency_to_string(UNIT_DEPENDENCY_FROM_PTR(dt
)),
1093 other
->id
, other
->id
, u
->id
);
1095 if (hashmap_isempty(deps
))
1096 hashmap_free(hashmap_remove(u
->dependencies
, dt
));
1100 _cleanup_hashmap_free_ Hashmap
*other_deps
= NULL
;
1101 UnitDependencyInfo di_back
;
1104 /* Let's focus on one dependency type at a time, that 'other' has defined. */
1105 other_deps
= hashmap_steal_first_key_and_value(other
->dependencies
, &dt
);
1109 deps
= hashmap_get(u
->dependencies
, dt
);
1111 /* Now iterate through all dependencies of this dependency type, of 'other'. We refer to the
1112 * referenced units as 'back'. */
1113 HASHMAP_FOREACH_KEY(di_back
.data
, back
, other_deps
) {
1118 /* This is a dependency pointing back to the unit we want to merge with?
1119 * Suppress it (but warn) */
1120 if (unit_should_warn_about_dependency(UNIT_DEPENDENCY_FROM_PTR(dt
)))
1121 log_unit_warning(u
, "Dependency %s=%s in %s is dropped, as %s is merged into %s.",
1122 unit_dependency_to_string(UNIT_DEPENDENCY_FROM_PTR(dt
)),
1123 u
->id
, other
->id
, other
->id
, u
->id
);
1125 hashmap_remove(other_deps
, back
);
1129 /* Now iterate through all deps of 'back', and fix the ones pointing to 'other' to
1130 * point to 'u' instead. */
1131 HASHMAP_FOREACH_KEY(back_deps
, back_dt
, back
->dependencies
) {
1132 UnitDependencyInfo di_move
;
1134 di_move
.data
= hashmap_remove(back_deps
, other
);
1138 assert_se(unit_per_dependency_type_hashmap_update(
1141 di_move
.origin_mask
,
1142 di_move
.destination_mask
) >= 0);
1145 /* The target unit already has dependencies of this type, let's then merge this individually. */
1147 assert_se(unit_per_dependency_type_hashmap_update(
1150 di_back
.origin_mask
,
1151 di_back
.destination_mask
) >= 0);
1154 /* Now all references towards 'other' of the current type 'dt' are corrected to point to 'u'.
1155 * Lets's now move the deps of type 'dt' from 'other' to 'u'. If the unit does not have
1156 * dependencies of this type, let's move them per type wholesale. */
1158 assert_se(hashmap_put(u
->dependencies
, dt
, TAKE_PTR(other_deps
)) >= 0);
1161 other
->dependencies
= hashmap_free(other
->dependencies
);
1164 int unit_merge(Unit
*u
, Unit
*other
) {
1169 assert(u
->manager
== other
->manager
);
1170 assert(u
->type
!= _UNIT_TYPE_INVALID
);
1172 other
= unit_follow_merge(other
);
1177 if (u
->type
!= other
->type
)
1180 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
1183 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
1186 if (!streq_ptr(u
->instance
, other
->instance
))
1195 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1198 /* Make reservations to ensure merge_dependencies() won't fail. We don't rollback reservations if we
1199 * fail. We don't have a way to undo reservations. A reservation is not a leak. */
1200 r
= unit_reserve_dependencies(u
, other
);
1204 /* Redirect all references */
1205 while (other
->refs_by_target
)
1206 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
1208 /* Merge dependencies */
1209 unit_merge_dependencies(u
, other
);
1211 /* Merge names. It is better to do that after merging deps, otherwise the log message contains n/a. */
1212 r
= unit_merge_names(u
, other
);
1216 other
->load_state
= UNIT_MERGED
;
1217 other
->merged_into
= u
;
1219 if (!u
->activation_details
)
1220 u
->activation_details
= activation_details_ref(other
->activation_details
);
1222 /* If there is still some data attached to the other node, we
1223 * don't need it anymore, and can free it. */
1224 if (other
->load_state
!= UNIT_STUB
)
1225 if (UNIT_VTABLE(other
)->done
)
1226 UNIT_VTABLE(other
)->done(other
);
1228 unit_add_to_dbus_queue(u
);
1229 unit_add_to_cleanup_queue(other
);
1234 int unit_merge_by_name(Unit
*u
, const char *name
) {
1235 _cleanup_free_
char *s
= NULL
;
1239 /* Either add name to u, or if a unit with name already exists, merge it with u.
1240 * If name is a template, do the same for name@instance, where instance is u's instance. */
1245 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
1249 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
1256 other
= manager_get_unit(u
->manager
, name
);
1258 return unit_merge(u
, other
);
1260 return unit_add_name(u
, name
);
1263 Unit
* unit_follow_merge(Unit
*u
) {
1266 while (u
->load_state
== UNIT_MERGED
)
1267 assert_se(u
= u
->merged_into
);
1272 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
1278 /* Unlike unit_add_dependency() or friends, this always returns 0 on success. */
1280 if (c
->working_directory
&& !c
->working_directory_missing_ok
) {
1281 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
1286 if (c
->root_directory
) {
1287 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
1292 if (c
->root_image
) {
1293 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
1298 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
1299 if (!u
->manager
->prefix
[dt
])
1302 for (size_t i
= 0; i
< c
->directories
[dt
].n_items
; i
++) {
1303 _cleanup_free_
char *p
= NULL
;
1305 p
= path_join(u
->manager
->prefix
[dt
], c
->directories
[dt
].items
[i
].path
);
1309 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1315 if (!MANAGER_IS_SYSTEM(u
->manager
))
1318 /* For the following three directory types we need write access, and /var/ is possibly on the root
1319 * fs. Hence order after systemd-remount-fs.service, to ensure things are writable. */
1320 if (c
->directories
[EXEC_DIRECTORY_STATE
].n_items
> 0 ||
1321 c
->directories
[EXEC_DIRECTORY_CACHE
].n_items
> 0 ||
1322 c
->directories
[EXEC_DIRECTORY_LOGS
].n_items
> 0) {
1323 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_REMOUNT_FS_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1328 if (c
->private_tmp
) {
1330 /* FIXME: for now we make a special case for /tmp and add a weak dependency on
1331 * tmp.mount so /tmp being masked is supported. However there's no reason to treat
1332 * /tmp specifically and masking other mount units should be handled more
1333 * gracefully too, see PR#16894. */
1334 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "tmp.mount", true, UNIT_DEPENDENCY_FILE
);
1338 r
= unit_require_mounts_for(u
, "/var/tmp", UNIT_DEPENDENCY_FILE
);
1342 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1347 if (c
->root_image
) {
1348 /* We need to wait for /dev/loopX to appear when doing RootImage=, hence let's add an
1349 * implicit dependency on udev */
1351 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_UDEVD_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1356 if (!IN_SET(c
->std_output
,
1357 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1358 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1359 !IN_SET(c
->std_error
,
1360 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1361 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1365 /* If syslog or kernel logging is requested (or log namespacing is), make sure our own logging daemon
1368 if (c
->log_namespace
) {
1369 _cleanup_free_
char *socket_unit
= NULL
, *varlink_socket_unit
= NULL
;
1371 r
= unit_name_build_from_type("systemd-journald", c
->log_namespace
, UNIT_SOCKET
, &socket_unit
);
1375 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1379 r
= unit_name_build_from_type("systemd-journald-varlink", c
->log_namespace
, UNIT_SOCKET
, &varlink_socket_unit
);
1383 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, varlink_socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1387 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1392 r
= unit_add_default_credential_dependencies(u
, c
);
1399 const char* unit_description(Unit
*u
) {
1403 return u
->description
;
1405 return strna(u
->id
);
1408 const char* unit_status_string(Unit
*u
, char **ret_combined_buffer
) {
1412 /* Return u->id, u->description, or "{u->id} - {u->description}".
1413 * Versions with u->description are only used if it is set.
1414 * The last option is used if configured and the caller provided the 'ret_combined_buffer'
1417 * Note that *ret_combined_buffer may be set to NULL. */
1419 if (!u
->description
||
1420 u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
||
1421 (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& !ret_combined_buffer
) ||
1422 streq(u
->description
, u
->id
)) {
1424 if (ret_combined_buffer
)
1425 *ret_combined_buffer
= NULL
;
1429 if (ret_combined_buffer
) {
1430 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
) {
1431 *ret_combined_buffer
= strjoin(u
->id
, " - ", u
->description
);
1432 if (*ret_combined_buffer
)
1433 return *ret_combined_buffer
;
1434 log_oom(); /* Fall back to ->description */
1436 *ret_combined_buffer
= NULL
;
1439 return u
->description
;
1442 /* Common implementation for multiple backends */
1443 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1448 /* Load a .{service,socket,...} file */
1449 r
= unit_load_fragment(u
);
1453 if (u
->load_state
== UNIT_STUB
) {
1454 if (fragment_required
)
1457 u
->load_state
= UNIT_LOADED
;
1460 /* Load drop-in directory data. If u is an alias, we might be reloading the
1461 * target unit needlessly. But we cannot be sure which drops-ins have already
1462 * been loaded and which not, at least without doing complicated book-keeping,
1463 * so let's always reread all drop-ins. */
1464 r
= unit_load_dropin(unit_follow_merge(u
));
1468 if (u
->source_path
) {
1471 if (stat(u
->source_path
, &st
) >= 0)
1472 u
->source_mtime
= timespec_load(&st
.st_mtim
);
1474 u
->source_mtime
= 0;
1480 void unit_add_to_target_deps_queue(Unit
*u
) {
1481 Manager
*m
= ASSERT_PTR(ASSERT_PTR(u
)->manager
);
1483 if (u
->in_target_deps_queue
)
1486 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1487 u
->in_target_deps_queue
= true;
1490 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1494 if (target
->type
!= UNIT_TARGET
)
1497 /* Only add the dependency if both units are loaded, so that
1498 * that loop check below is reliable */
1499 if (u
->load_state
!= UNIT_LOADED
||
1500 target
->load_state
!= UNIT_LOADED
)
1503 /* If either side wants no automatic dependencies, then let's
1505 if (!u
->default_dependencies
||
1506 !target
->default_dependencies
)
1509 /* Don't create loops */
1510 if (unit_has_dependency(target
, UNIT_ATOM_BEFORE
, u
))
1513 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1516 static int unit_add_slice_dependencies(Unit
*u
) {
1520 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1523 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1524 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1526 UnitDependencyMask mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1528 slice
= UNIT_GET_SLICE(u
);
1530 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, slice
, true, mask
);
1532 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1535 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1538 static int unit_add_mount_dependencies(Unit
*u
) {
1539 UnitDependencyInfo di
;
1541 bool changed
= false;
1546 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
) {
1547 char prefix
[strlen(path
) + 1];
1549 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1550 _cleanup_free_
char *p
= NULL
;
1553 r
= unit_name_from_path(prefix
, ".mount", &p
);
1555 continue; /* If the path cannot be converted to a mount unit name, then it's
1556 * not manageable as a unit by systemd, and hence we don't need a
1557 * dependency on it. Let's thus silently ignore the issue. */
1561 m
= manager_get_unit(u
->manager
, p
);
1563 /* Make sure to load the mount unit if it exists. If so the dependencies on
1564 * this unit will be added later during the loading of the mount unit. */
1565 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1571 if (m
->load_state
!= UNIT_LOADED
)
1574 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1577 changed
= changed
|| r
> 0;
1579 if (m
->fragment_path
) {
1580 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1583 changed
= changed
|| r
> 0;
1591 static int unit_add_oomd_dependencies(Unit
*u
) {
1598 if (!u
->default_dependencies
)
1601 c
= unit_get_cgroup_context(u
);
1605 bool wants_oomd
= c
->moom_swap
== MANAGED_OOM_KILL
|| c
->moom_mem_pressure
== MANAGED_OOM_KILL
;
1609 if (!cg_all_unified())
1612 r
= cg_mask_supported(&mask
);
1614 return log_debug_errno(r
, "Failed to determine supported controllers: %m");
1616 if (!FLAGS_SET(mask
, CGROUP_MASK_MEMORY
))
1619 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "systemd-oomd.service", true, UNIT_DEPENDENCY_FILE
);
1622 static int unit_add_startup_units(Unit
*u
) {
1623 if (!unit_has_startup_cgroup_constraints(u
))
1626 return set_ensure_put(&u
->manager
->startup_units
, NULL
, u
);
1629 static int unit_validate_on_failure_job_mode(
1631 const char *job_mode_setting
,
1633 const char *dependency_name
,
1634 UnitDependencyAtom atom
) {
1636 Unit
*other
, *found
= NULL
;
1638 if (job_mode
!= JOB_ISOLATE
)
1641 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
1644 else if (found
!= other
)
1645 return log_unit_error_errno(
1646 u
, SYNTHETIC_ERRNO(ENOEXEC
),
1647 "More than one %s dependencies specified but %sisolate set. Refusing.",
1648 dependency_name
, job_mode_setting
);
1654 int unit_load(Unit
*u
) {
1659 if (u
->in_load_queue
) {
1660 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1661 u
->in_load_queue
= false;
1664 if (u
->type
== _UNIT_TYPE_INVALID
)
1667 if (u
->load_state
!= UNIT_STUB
)
1670 if (u
->transient_file
) {
1671 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1672 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1674 r
= fflush_and_check(u
->transient_file
);
1678 u
->transient_file
= safe_fclose(u
->transient_file
);
1679 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1682 r
= UNIT_VTABLE(u
)->load(u
);
1686 assert(u
->load_state
!= UNIT_STUB
);
1688 if (u
->load_state
== UNIT_LOADED
) {
1689 unit_add_to_target_deps_queue(u
);
1691 r
= unit_add_slice_dependencies(u
);
1695 r
= unit_add_mount_dependencies(u
);
1699 r
= unit_add_oomd_dependencies(u
);
1703 r
= unit_add_startup_units(u
);
1707 r
= unit_validate_on_failure_job_mode(u
, "OnSuccessJobMode=", u
->on_success_job_mode
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
);
1711 r
= unit_validate_on_failure_job_mode(u
, "OnFailureJobMode=", u
->on_failure_job_mode
, "OnFailure=", UNIT_ATOM_ON_FAILURE
);
1715 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1716 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1718 /* We finished loading, let's ensure our parents recalculate the members mask */
1719 unit_invalidate_cgroup_members_masks(u
);
1722 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1724 unit_add_to_dbus_queue(unit_follow_merge(u
));
1725 unit_add_to_gc_queue(u
);
1726 (void) manager_varlink_send_managed_oom_update(u
);
1731 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code
1732 * should hence return ENOEXEC to ensure units are placed in this state after loading. */
1734 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1735 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1739 /* Record the timestamp on the cache, so that if the cache gets updated between now and the next time
1740 * an attempt is made to load this unit, we know we need to check again. */
1741 if (u
->load_state
== UNIT_NOT_FOUND
)
1742 u
->fragment_not_found_timestamp_hash
= u
->manager
->unit_cache_timestamp_hash
;
1744 unit_add_to_dbus_queue(u
);
1745 unit_add_to_gc_queue(u
);
1747 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1751 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1756 if (u
&& !unit_log_level_test(u
, level
))
1757 return -ERRNO_VALUE(error
);
1759 va_start(ap
, format
);
1761 r
= log_object_internalv(level
, error
, file
, line
, func
,
1762 u
->manager
->unit_log_field
,
1764 u
->manager
->invocation_log_field
,
1765 u
->invocation_id_string
,
1768 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1774 static bool unit_test_condition(Unit
*u
) {
1775 _cleanup_strv_free_
char **env
= NULL
;
1780 dual_timestamp_get(&u
->condition_timestamp
);
1782 r
= manager_get_effective_environment(u
->manager
, &env
);
1784 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1785 u
->condition_result
= true;
1787 u
->condition_result
= condition_test_list(
1790 condition_type_to_string
,
1794 unit_add_to_dbus_queue(u
);
1795 return u
->condition_result
;
1798 static bool unit_test_assert(Unit
*u
) {
1799 _cleanup_strv_free_
char **env
= NULL
;
1804 dual_timestamp_get(&u
->assert_timestamp
);
1806 r
= manager_get_effective_environment(u
->manager
, &env
);
1808 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1809 u
->assert_result
= CONDITION_ERROR
;
1811 u
->assert_result
= condition_test_list(
1814 assert_type_to_string
,
1818 unit_add_to_dbus_queue(u
);
1819 return u
->assert_result
;
1822 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *format
, const char *ident
) {
1823 if (log_get_show_color()) {
1824 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& strchr(ident
, ' '))
1825 ident
= strjoina(ANSI_HIGHLIGHT
, u
->id
, ANSI_NORMAL
, " - ", u
->description
);
1827 ident
= strjoina(ANSI_HIGHLIGHT
, ident
, ANSI_NORMAL
);
1830 DISABLE_WARNING_FORMAT_NONLITERAL
;
1831 manager_status_printf(u
->manager
, status_type
, status
, format
, ident
);
1835 int unit_test_start_limit(Unit
*u
) {
1840 if (ratelimit_below(&u
->start_ratelimit
)) {
1841 u
->start_limit_hit
= false;
1845 log_unit_warning(u
, "Start request repeated too quickly.");
1846 u
->start_limit_hit
= true;
1848 reason
= strjoina("unit ", u
->id
, " failed");
1850 emergency_action(u
->manager
, u
->start_limit_action
,
1851 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1852 u
->reboot_arg
, -1, reason
);
1857 bool unit_shall_confirm_spawn(Unit
*u
) {
1860 if (manager_is_confirm_spawn_disabled(u
->manager
))
1863 /* For some reasons units remaining in the same process group
1864 * as PID 1 fail to acquire the console even if it's not used
1865 * by any process. So skip the confirmation question for them. */
1866 return !unit_get_exec_context(u
)->same_pgrp
;
1869 static bool unit_verify_deps(Unit
*u
) {
1874 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined
1875 * with After=. We do not check Requires= or Requisite= here as they only should have an effect on
1876 * the job processing, but do not have any effect afterwards. We don't check BindsTo= dependencies
1877 * that are not used in conjunction with After= as for them any such check would make things entirely
1880 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
1882 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
))
1885 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1886 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1894 /* Errors that aren't really errors:
1895 * -EALREADY: Unit is already started.
1896 * -ECOMM: Condition failed
1897 * -EAGAIN: An operation is already in progress. Retry later.
1899 * Errors that are real errors:
1900 * -EBADR: This unit type does not support starting.
1901 * -ECANCELED: Start limit hit, too many requests for now
1902 * -EPROTO: Assert failed
1903 * -EINVAL: Unit not loaded
1904 * -EOPNOTSUPP: Unit type not supported
1905 * -ENOLINK: The necessary dependencies are not fulfilled.
1906 * -ESTALE: This unit has been started before and can't be started a second time
1907 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1909 int unit_start(Unit
*u
, ActivationDetails
*details
) {
1910 UnitActiveState state
;
1916 /* Let's hold off running start jobs for mount units when /proc/self/mountinfo monitor is ratelimited. */
1917 if (UNIT_VTABLE(u
)->subsystem_ratelimited
) {
1918 r
= UNIT_VTABLE(u
)->subsystem_ratelimited(u
->manager
);
1925 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1926 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1927 * waiting is finished. */
1928 state
= unit_active_state(u
);
1929 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1931 if (state
== UNIT_MAINTENANCE
)
1934 /* Units that aren't loaded cannot be started */
1935 if (u
->load_state
!= UNIT_LOADED
)
1938 /* Refuse starting scope units more than once */
1939 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1942 /* If the conditions were unmet, don't do anything at all. If we already are activating this call might
1943 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1944 * recheck the condition in that case. */
1945 if (state
!= UNIT_ACTIVATING
&&
1946 !unit_test_condition(u
))
1947 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition not met. Not starting unit.");
1949 /* If the asserts failed, fail the entire job */
1950 if (state
!= UNIT_ACTIVATING
&&
1951 !unit_test_assert(u
))
1952 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1954 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1955 * condition checks, so that we rather return condition check errors (which are usually not
1956 * considered a true failure) than "not supported" errors (which are considered a failure).
1958 if (!unit_type_supported(u
->type
))
1961 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1962 * should have taken care of this already, but let's check this here again. After all, our
1963 * dependencies might not be in effect anymore, due to a reload or due to an unmet condition. */
1964 if (!unit_verify_deps(u
))
1967 /* Forward to the main object, if we aren't it. */
1968 following
= unit_following(u
);
1970 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1971 return unit_start(following
, details
);
1974 /* Check our ability to start early so that failure conditions don't cause us to enter a busy loop. */
1975 if (UNIT_VTABLE(u
)->can_start
) {
1976 r
= UNIT_VTABLE(u
)->can_start(u
);
1981 /* If it is stopped, but we cannot start it, then fail */
1982 if (!UNIT_VTABLE(u
)->start
)
1985 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1986 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1987 * waits for a holdoff timer to elapse before it will start again. */
1989 unit_add_to_dbus_queue(u
);
1990 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1992 if (!u
->activation_details
) /* Older details object wins */
1993 u
->activation_details
= activation_details_ref(details
);
1995 return UNIT_VTABLE(u
)->start(u
);
1998 bool unit_can_start(Unit
*u
) {
2001 if (u
->load_state
!= UNIT_LOADED
)
2004 if (!unit_type_supported(u
->type
))
2007 /* Scope units may be started only once */
2008 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
2011 return !!UNIT_VTABLE(u
)->start
;
2014 bool unit_can_isolate(Unit
*u
) {
2017 return unit_can_start(u
) &&
2022 * -EBADR: This unit type does not support stopping.
2023 * -EALREADY: Unit is already stopped.
2024 * -EAGAIN: An operation is already in progress. Retry later.
2026 int unit_stop(Unit
*u
) {
2027 UnitActiveState state
;
2032 state
= unit_active_state(u
);
2033 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
2036 following
= unit_following(u
);
2038 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
2039 return unit_stop(following
);
2042 if (!UNIT_VTABLE(u
)->stop
)
2045 unit_add_to_dbus_queue(u
);
2046 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2048 return UNIT_VTABLE(u
)->stop(u
);
2051 bool unit_can_stop(Unit
*u
) {
2054 /* Note: if we return true here, it does not mean that the unit may be successfully stopped.
2055 * Extrinsic units follow external state and they may stop following external state changes
2056 * (hence we return true here), but an attempt to do this through the manager will fail. */
2058 if (!unit_type_supported(u
->type
))
2064 return !!UNIT_VTABLE(u
)->stop
;
2068 * -EBADR: This unit type does not support reloading.
2069 * -ENOEXEC: Unit is not started.
2070 * -EAGAIN: An operation is already in progress. Retry later.
2072 int unit_reload(Unit
*u
) {
2073 UnitActiveState state
;
2078 if (u
->load_state
!= UNIT_LOADED
)
2081 if (!unit_can_reload(u
))
2084 state
= unit_active_state(u
);
2085 if (state
== UNIT_RELOADING
)
2088 if (state
!= UNIT_ACTIVE
)
2089 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
), "Unit cannot be reloaded because it is inactive.");
2091 following
= unit_following(u
);
2093 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
2094 return unit_reload(following
);
2097 unit_add_to_dbus_queue(u
);
2099 if (!UNIT_VTABLE(u
)->reload
) {
2100 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
2101 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), /* reload_success = */ true);
2105 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2107 return UNIT_VTABLE(u
)->reload(u
);
2110 bool unit_can_reload(Unit
*u
) {
2113 if (UNIT_VTABLE(u
)->can_reload
)
2114 return UNIT_VTABLE(u
)->can_reload(u
);
2116 if (unit_has_dependency(u
, UNIT_ATOM_PROPAGATES_RELOAD_TO
, NULL
))
2119 return UNIT_VTABLE(u
)->reload
;
2122 bool unit_is_unneeded(Unit
*u
) {
2126 if (!u
->stop_when_unneeded
)
2129 /* Don't clean up while the unit is transitioning or is even inactive. */
2130 if (unit_active_state(u
) != UNIT_ACTIVE
)
2135 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_PINS_STOP_WHEN_UNNEEDED
) {
2136 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
2137 * restart, then don't clean this one up. */
2142 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2145 if (unit_will_restart(other
))
2152 bool unit_is_upheld_by_active(Unit
*u
, Unit
**ret_culprit
) {
2157 /* Checks if the unit needs to be started because it currently is not running, but some other unit
2158 * that is active declared an Uphold= dependencies on it */
2160 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)) || u
->job
) {
2162 *ret_culprit
= NULL
;
2166 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_START_STEADILY
) {
2170 if (UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
2172 *ret_culprit
= other
;
2178 *ret_culprit
= NULL
;
2182 bool unit_is_bound_by_inactive(Unit
*u
, Unit
**ret_culprit
) {
2187 /* Checks whether this unit is bound to another unit that is inactive, i.e. whether we should stop
2188 * because the other unit is down. */
2190 if (unit_active_state(u
) != UNIT_ACTIVE
|| u
->job
) {
2191 /* Don't clean up while the unit is transitioning or is even inactive. */
2193 *ret_culprit
= NULL
;
2197 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
2201 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
))) {
2203 *ret_culprit
= other
;
2210 *ret_culprit
= NULL
;
2214 static void check_unneeded_dependencies(Unit
*u
) {
2218 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2220 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_STOP_WHEN_UNNEEDED_QUEUE
)
2221 unit_submit_to_stop_when_unneeded_queue(other
);
2224 static void check_uphold_dependencies(Unit
*u
) {
2228 /* Add all units this unit depends on to the queue that processes Uphold= behaviour. */
2230 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_START_WHEN_UPHELD_QUEUE
)
2231 unit_submit_to_start_when_upheld_queue(other
);
2234 static void check_bound_by_dependencies(Unit
*u
) {
2238 /* Add all units this unit depends on to the queue that processes BindsTo= stop behaviour. */
2240 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_CANNOT_BE_ACTIVE_WITHOUT_QUEUE
)
2241 unit_submit_to_stop_when_bound_queue(other
);
2244 static void retroactively_start_dependencies(Unit
*u
) {
2248 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2250 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_REPLACE
) /* Requires= + BindsTo= */
2251 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2252 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2253 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2255 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_FAIL
) /* Wants= */
2256 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2257 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2258 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2260 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_START
) /* Conflicts= (and inverse) */
2261 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2262 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2265 static void retroactively_stop_dependencies(Unit
*u
) {
2269 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2271 /* Pull down units which are bound to us recursively if enabled */
2272 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_STOP
) /* BoundBy= */
2273 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2274 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2277 void unit_start_on_failure(
2279 const char *dependency_name
,
2280 UnitDependencyAtom atom
,
2288 assert(dependency_name
);
2289 assert(IN_SET(atom
, UNIT_ATOM_ON_SUCCESS
, UNIT_ATOM_ON_FAILURE
));
2291 /* Act on OnFailure= and OnSuccess= dependencies */
2293 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
2294 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2297 log_unit_info(u
, "Triggering %s dependencies.", dependency_name
);
2301 r
= manager_add_job(u
->manager
, JOB_START
, other
, job_mode
, NULL
, &error
, NULL
);
2303 log_unit_warning_errno(
2304 u
, r
, "Failed to enqueue %s job, ignoring: %s",
2305 dependency_name
, bus_error_message(&error
, r
));
2310 log_unit_debug(u
, "Triggering %s dependencies done (%i %s).",
2311 dependency_name
, n_jobs
, n_jobs
== 1 ? "job" : "jobs");
2314 void unit_trigger_notify(Unit
*u
) {
2319 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_TRIGGERED_BY
)
2320 if (UNIT_VTABLE(other
)->trigger_notify
)
2321 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2324 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2325 if (condition_notice
&& log_level
> LOG_NOTICE
)
2327 if (condition_info
&& log_level
> LOG_INFO
)
2332 static int unit_log_resources(Unit
*u
) {
2333 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4];
2334 bool any_traffic
= false, have_ip_accounting
= false, any_io
= false, have_io_accounting
= false;
2335 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
, *rr
= NULL
, *wr
= NULL
;
2336 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a threshold */
2337 size_t n_message_parts
= 0, n_iovec
= 0;
2338 char* message_parts
[1 + 2 + 2 + 1], *t
;
2339 nsec_t nsec
= NSEC_INFINITY
;
2341 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2342 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2343 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2344 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2345 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2347 const char* const io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2348 [CGROUP_IO_READ_BYTES
] = "IO_METRIC_READ_BYTES",
2349 [CGROUP_IO_WRITE_BYTES
] = "IO_METRIC_WRITE_BYTES",
2350 [CGROUP_IO_READ_OPERATIONS
] = "IO_METRIC_READ_OPERATIONS",
2351 [CGROUP_IO_WRITE_OPERATIONS
] = "IO_METRIC_WRITE_OPERATIONS",
2356 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2357 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2358 * information and the complete data in structured fields. */
2360 (void) unit_get_cpu_usage(u
, &nsec
);
2361 if (nsec
!= NSEC_INFINITY
) {
2362 /* Format the CPU time for inclusion in the structured log message */
2363 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2367 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2369 /* Format the CPU time for inclusion in the human language message string */
2370 t
= strjoin("consumed ", FORMAT_TIMESPAN(nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
), " CPU time");
2376 message_parts
[n_message_parts
++] = t
;
2378 log_level
= raise_level(log_level
,
2379 nsec
> MENTIONWORTHY_CPU_NSEC
,
2380 nsec
> NOTICEWORTHY_CPU_NSEC
);
2383 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2384 uint64_t value
= UINT64_MAX
;
2386 assert(io_fields
[k
]);
2388 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2389 if (value
== UINT64_MAX
)
2392 have_io_accounting
= true;
2396 /* Format IO accounting data for inclusion in the structured log message */
2397 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2401 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2403 /* Format the IO accounting data for inclusion in the human language message string, but only
2404 * for the bytes counters (and not for the operations counters) */
2405 if (k
== CGROUP_IO_READ_BYTES
) {
2407 rr
= strjoin("read ", strna(FORMAT_BYTES(value
)), " from disk");
2412 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2414 wr
= strjoin("written ", strna(FORMAT_BYTES(value
)), " to disk");
2421 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2422 log_level
= raise_level(log_level
,
2423 value
> MENTIONWORTHY_IO_BYTES
,
2424 value
> NOTICEWORTHY_IO_BYTES
);
2427 if (have_io_accounting
) {
2430 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2432 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2437 k
= strdup("no IO");
2443 message_parts
[n_message_parts
++] = k
;
2447 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2448 uint64_t value
= UINT64_MAX
;
2450 assert(ip_fields
[m
]);
2452 (void) unit_get_ip_accounting(u
, m
, &value
);
2453 if (value
== UINT64_MAX
)
2456 have_ip_accounting
= true;
2460 /* Format IP accounting data for inclusion in the structured log message */
2461 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2465 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2467 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2468 * bytes counters (and not for the packets counters) */
2469 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2471 igress
= strjoin("received ", strna(FORMAT_BYTES(value
)), " IP traffic");
2476 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2478 egress
= strjoin("sent ", strna(FORMAT_BYTES(value
)), " IP traffic");
2485 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2486 log_level
= raise_level(log_level
,
2487 value
> MENTIONWORTHY_IP_BYTES
,
2488 value
> NOTICEWORTHY_IP_BYTES
);
2491 /* This check is here because it is the earliest point following all possible log_level assignments. If
2492 * log_level is assigned anywhere after this point, move this check. */
2493 if (!unit_log_level_test(u
, log_level
)) {
2498 if (have_ip_accounting
) {
2501 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2503 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2508 k
= strdup("no IP traffic");
2514 message_parts
[n_message_parts
++] = k
;
2518 /* Is there any accounting data available at all? */
2524 if (n_message_parts
== 0)
2525 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2527 _cleanup_free_
char *joined
= NULL
;
2529 message_parts
[n_message_parts
] = NULL
;
2531 joined
= strv_join(message_parts
, ", ");
2537 joined
[0] = ascii_toupper(joined
[0]);
2538 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2541 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2542 * and hence don't increase n_iovec for them */
2543 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2544 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2546 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2547 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2549 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2550 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2552 log_unit_struct_iovec(u
, log_level
, iovec
, n_iovec
+ 4);
2556 free_many_charp(message_parts
, n_message_parts
);
2558 for (size_t i
= 0; i
< n_iovec
; i
++)
2559 free(iovec
[i
].iov_base
);
2565 static void unit_update_on_console(Unit
*u
) {
2570 b
= unit_needs_console(u
);
2571 if (u
->on_console
== b
)
2576 manager_ref_console(u
->manager
);
2578 manager_unref_console(u
->manager
);
2581 static void unit_emit_audit_start(Unit
*u
) {
2584 if (UNIT_VTABLE(u
)->audit_start_message_type
<= 0)
2587 /* Write audit record if we have just finished starting up */
2588 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_start_message_type
, /* success= */ true);
2592 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2595 if (UNIT_VTABLE(u
)->audit_start_message_type
<= 0)
2599 /* Write audit record if we have just finished shutting down */
2600 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_stop_message_type
, /* success= */ state
== UNIT_INACTIVE
);
2601 u
->in_audit
= false;
2603 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2604 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_start_message_type
, /* success= */ state
== UNIT_INACTIVE
);
2606 if (state
== UNIT_INACTIVE
)
2607 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_stop_message_type
, /* success= */ true);
2611 static bool unit_process_job(Job
*j
, UnitActiveState ns
, bool reload_success
) {
2612 bool unexpected
= false;
2617 if (j
->state
== JOB_WAITING
)
2618 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2620 job_add_to_run_queue(j
);
2622 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2623 * hence needs to invalidate jobs. */
2628 case JOB_VERIFY_ACTIVE
:
2630 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2631 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2632 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2635 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2636 if (ns
== UNIT_FAILED
)
2637 result
= JOB_FAILED
;
2641 job_finish_and_invalidate(j
, result
, true, false);
2648 case JOB_RELOAD_OR_START
:
2649 case JOB_TRY_RELOAD
:
2651 if (j
->state
== JOB_RUNNING
) {
2652 if (ns
== UNIT_ACTIVE
)
2653 job_finish_and_invalidate(j
, reload_success
? JOB_DONE
: JOB_FAILED
, true, false);
2654 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2657 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2658 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2666 case JOB_TRY_RESTART
:
2668 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2669 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2670 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2672 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2678 assert_not_reached();
2684 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, bool reload_success
) {
2689 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2690 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2692 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2693 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2694 * remounted this function will be called too! */
2698 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2699 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2700 unit_add_to_dbus_queue(u
);
2702 /* Update systemd-oomd on the property/state change */
2704 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2706 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2707 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2708 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2709 * have the information on the property. Thus, indiscriminately send an update. */
2710 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2711 (void) manager_varlink_send_managed_oom_update(u
);
2714 /* Update timestamps for state changes */
2715 if (!MANAGER_IS_RELOADING(m
)) {
2716 dual_timestamp_get(&u
->state_change_timestamp
);
2718 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2719 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2720 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2721 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2723 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2724 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2725 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2726 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2729 /* Keep track of failed units */
2730 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2732 /* Make sure the cgroup and state files are always removed when we become inactive */
2733 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2734 SET_FLAG(u
->markers
,
2735 (1u << UNIT_MARKER_NEEDS_RELOAD
)|(1u << UNIT_MARKER_NEEDS_RESTART
),
2737 unit_prune_cgroup(u
);
2738 unit_unlink_state_files(u
);
2739 } else if (ns
!= os
&& ns
== UNIT_RELOADING
)
2740 SET_FLAG(u
->markers
, 1u << UNIT_MARKER_NEEDS_RELOAD
, false);
2742 unit_update_on_console(u
);
2744 if (!MANAGER_IS_RELOADING(m
)) {
2747 /* Let's propagate state changes to the job */
2749 unexpected
= unit_process_job(u
->job
, ns
, reload_success
);
2753 /* If this state change happened without being requested by a job, then let's retroactively start or
2754 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2755 * additional jobs just because something is already activated. */
2758 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2759 retroactively_start_dependencies(u
);
2760 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2761 retroactively_stop_dependencies(u
);
2764 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2765 log_unit_debug(u
, "Unit entered failed state.");
2766 unit_start_on_failure(u
, "OnFailure=", UNIT_ATOM_ON_FAILURE
, u
->on_failure_job_mode
);
2769 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2770 /* This unit just finished starting up */
2772 unit_emit_audit_start(u
);
2773 manager_send_unit_plymouth(m
, u
);
2776 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2777 /* This unit just stopped/failed. */
2779 unit_emit_audit_stop(u
, ns
);
2780 unit_log_resources(u
);
2783 if (ns
== UNIT_INACTIVE
&& !IN_SET(os
, UNIT_FAILED
, UNIT_INACTIVE
, UNIT_MAINTENANCE
))
2784 unit_start_on_failure(u
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
, u
->on_success_job_mode
);
2787 manager_recheck_journal(m
);
2788 manager_recheck_dbus(m
);
2790 unit_trigger_notify(u
);
2792 if (!MANAGER_IS_RELOADING(m
)) {
2793 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2794 reason
= strjoina("unit ", u
->id
, " failed");
2795 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2796 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2797 reason
= strjoina("unit ", u
->id
, " succeeded");
2798 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2802 /* And now, add the unit or depending units to various queues that will act on the new situation if
2803 * needed. These queues generally check for continuous state changes rather than events (like most of
2804 * the state propagation above), and do work deferred instead of instantly, since they typically
2805 * don't want to run during reloading, and usually involve checking combined state of multiple units
2808 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2809 /* Stop unneeded units and bound-by units regardless if going down was expected or not */
2810 check_unneeded_dependencies(u
);
2811 check_bound_by_dependencies(u
);
2813 /* Maybe someone wants us to remain up? */
2814 unit_submit_to_start_when_upheld_queue(u
);
2816 /* Maybe the unit should be GC'ed now? */
2817 unit_add_to_gc_queue(u
);
2819 /* Maybe we can release some resources now? */
2820 unit_submit_to_release_resources_queue(u
);
2823 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2824 /* Start uphold units regardless if going up was expected or not */
2825 check_uphold_dependencies(u
);
2827 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2828 unit_submit_to_stop_when_unneeded_queue(u
);
2830 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens
2831 * when something BindsTo= to a Type=oneshot unit, as these units go directly from starting to
2832 * inactive, without ever entering started.) */
2833 unit_submit_to_stop_when_bound_queue(u
);
2837 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2841 assert(pid_is_valid(pid
));
2843 /* Watch a specific PID */
2845 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2846 * opportunity to remove any stalled references to this PID as they can be created
2847 * easily (when watching a process which is not our direct child). */
2849 manager_unwatch_pid(u
->manager
, pid
);
2851 r
= set_ensure_allocated(&u
->pids
, NULL
);
2855 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2859 /* First try, let's add the unit keyed by "pid". */
2860 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2866 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2867 * to an array of Units rather than just a Unit), lists us already. */
2869 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2871 for (; array
[n
]; n
++)
2878 /* Allocate a new array */
2879 new_array
= new(Unit
*, n
+ 2);
2883 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2885 new_array
[n
+1] = NULL
;
2887 /* Add or replace the old array */
2888 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2899 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2906 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2910 assert(pid_is_valid(pid
));
2912 /* First let's drop the unit in case it's keyed as "pid". */
2913 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2915 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2916 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2918 /* Let's iterate through the array, dropping our own entry */
2921 for (size_t n
= 0; array
[n
]; n
++)
2923 array
[m
++] = array
[n
];
2927 /* The array is now empty, remove the entire entry */
2928 assert_se(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2933 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2936 void unit_unwatch_all_pids(Unit
*u
) {
2939 while (!set_isempty(u
->pids
))
2940 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2942 u
->pids
= set_free(u
->pids
);
2945 static void unit_tidy_watch_pids(Unit
*u
) {
2946 PidRef
*except1
, *except2
;
2951 /* Cleans dead PIDs from our list */
2953 except1
= unit_main_pid(u
);
2954 except2
= unit_control_pid(u
);
2956 SET_FOREACH(e
, u
->pids
) {
2957 pid_t pid
= PTR_TO_PID(e
);
2959 if ((pidref_is_set(except1
) && pid
== except1
->pid
) ||
2960 (pidref_is_set(except2
) && pid
== except2
->pid
))
2963 if (!pid_is_unwaited(pid
))
2964 unit_unwatch_pid(u
, pid
);
2968 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2969 Unit
*u
= ASSERT_PTR(userdata
);
2973 unit_tidy_watch_pids(u
);
2974 unit_watch_all_pids(u
);
2976 /* If the PID set is empty now, then let's finish this off. */
2977 unit_synthesize_cgroup_empty_event(u
);
2982 int unit_enqueue_rewatch_pids(Unit
*u
) {
2987 if (!u
->cgroup_path
)
2990 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2993 if (r
> 0) /* On unified we can use proper notifications */
2996 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2997 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2998 * involves issuing kill(pid, 0) on all processes we watch. */
3000 if (!u
->rewatch_pids_event_source
) {
3001 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
3003 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
3005 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
3007 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
3009 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
3011 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
3013 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
3016 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
3018 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
3023 void unit_dequeue_rewatch_pids(Unit
*u
) {
3027 if (!u
->rewatch_pids_event_source
)
3030 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
3032 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
3034 u
->rewatch_pids_event_source
= sd_event_source_disable_unref(u
->rewatch_pids_event_source
);
3037 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
3039 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
3043 case JOB_VERIFY_ACTIVE
:
3046 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
3047 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
3052 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
3053 * external events), hence it makes no sense to permit enqueuing such a request either. */
3054 return !u
->perpetual
;
3057 case JOB_TRY_RESTART
:
3058 return unit_can_stop(u
) && unit_can_start(u
);
3061 case JOB_TRY_RELOAD
:
3062 return unit_can_reload(u
);
3064 case JOB_RELOAD_OR_START
:
3065 return unit_can_reload(u
) && unit_can_start(u
);
3068 assert_not_reached();
3072 static Hashmap
*unit_get_dependency_hashmap_per_type(Unit
*u
, UnitDependency d
) {
3076 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3078 deps
= hashmap_get(u
->dependencies
, UNIT_DEPENDENCY_TO_PTR(d
));
3080 _cleanup_hashmap_free_ Hashmap
*h
= NULL
;
3082 h
= hashmap_new(NULL
);
3086 if (hashmap_ensure_put(&u
->dependencies
, NULL
, UNIT_DEPENDENCY_TO_PTR(d
), h
) < 0)
3095 typedef enum NotifyDependencyFlags
{
3096 NOTIFY_DEPENDENCY_UPDATE_FROM
= 1 << 0,
3097 NOTIFY_DEPENDENCY_UPDATE_TO
= 1 << 1,
3098 } NotifyDependencyFlags
;
3100 static int unit_add_dependency_impl(
3104 UnitDependencyMask mask
) {
3106 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
3107 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
3108 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
3109 [UNIT_WANTS
] = UNIT_WANTED_BY
,
3110 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
3111 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
3112 [UNIT_UPHOLDS
] = UNIT_UPHELD_BY
,
3113 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
3114 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
3115 [UNIT_WANTED_BY
] = UNIT_WANTS
,
3116 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
3117 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
3118 [UNIT_UPHELD_BY
] = UNIT_UPHOLDS
,
3119 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
3120 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
3121 [UNIT_BEFORE
] = UNIT_AFTER
,
3122 [UNIT_AFTER
] = UNIT_BEFORE
,
3123 [UNIT_ON_SUCCESS
] = UNIT_ON_SUCCESS_OF
,
3124 [UNIT_ON_SUCCESS_OF
] = UNIT_ON_SUCCESS
,
3125 [UNIT_ON_FAILURE
] = UNIT_ON_FAILURE_OF
,
3126 [UNIT_ON_FAILURE_OF
] = UNIT_ON_FAILURE
,
3127 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
3128 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
3129 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3130 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3131 [UNIT_PROPAGATES_STOP_TO
] = UNIT_STOP_PROPAGATED_FROM
,
3132 [UNIT_STOP_PROPAGATED_FROM
] = UNIT_PROPAGATES_STOP_TO
,
3133 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
, /* symmetric! 👓 */
3134 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3135 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3136 [UNIT_IN_SLICE
] = UNIT_SLICE_OF
,
3137 [UNIT_SLICE_OF
] = UNIT_IN_SLICE
,
3140 Hashmap
*u_deps
, *other_deps
;
3141 UnitDependencyInfo u_info
, u_info_old
, other_info
, other_info_old
;
3142 NotifyDependencyFlags flags
= 0;
3147 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3148 assert(inverse_table
[d
] >= 0 && inverse_table
[d
] < _UNIT_DEPENDENCY_MAX
);
3149 assert(mask
> 0 && mask
< _UNIT_DEPENDENCY_MASK_FULL
);
3151 /* Ensure the following two hashmaps for each unit exist:
3152 * - the top-level dependency hashmap that maps UnitDependency → Hashmap(Unit* → UnitDependencyInfo),
3153 * - the inner hashmap, that maps Unit* → UnitDependencyInfo, for the specified dependency type. */
3154 u_deps
= unit_get_dependency_hashmap_per_type(u
, d
);
3158 other_deps
= unit_get_dependency_hashmap_per_type(other
, inverse_table
[d
]);
3162 /* Save the original dependency info. */
3163 u_info
.data
= u_info_old
.data
= hashmap_get(u_deps
, other
);
3164 other_info
.data
= other_info_old
.data
= hashmap_get(other_deps
, u
);
3166 /* Update dependency info. */
3167 u_info
.origin_mask
|= mask
;
3168 other_info
.destination_mask
|= mask
;
3170 /* Save updated dependency info. */
3171 if (u_info
.data
!= u_info_old
.data
) {
3172 r
= hashmap_replace(u_deps
, other
, u_info
.data
);
3176 flags
= NOTIFY_DEPENDENCY_UPDATE_FROM
;
3179 if (other_info
.data
!= other_info_old
.data
) {
3180 r
= hashmap_replace(other_deps
, u
, other_info
.data
);
3182 if (u_info
.data
!= u_info_old
.data
) {
3183 /* Restore the old dependency. */
3184 if (u_info_old
.data
)
3185 (void) hashmap_update(u_deps
, other
, u_info_old
.data
);
3187 hashmap_remove(u_deps
, other
);
3192 flags
|= NOTIFY_DEPENDENCY_UPDATE_TO
;
3198 int unit_add_dependency(
3203 UnitDependencyMask mask
) {
3205 UnitDependencyAtom a
;
3208 /* Helper to know whether sending a notification is necessary or not: if the dependency is already
3209 * there, no need to notify! */
3210 NotifyDependencyFlags notify_flags
;
3213 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3216 u
= unit_follow_merge(u
);
3217 other
= unit_follow_merge(other
);
3218 a
= unit_dependency_to_atom(d
);
3221 /* We won't allow dependencies on ourselves. We will not consider them an error however. */
3223 if (unit_should_warn_about_dependency(d
))
3224 log_unit_warning(u
, "Dependency %s=%s is dropped.",
3225 unit_dependency_to_string(d
), u
->id
);
3229 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3232 /* Note that ordering a device unit after a unit is permitted since it allows to start its job
3233 * running timeout at a specific time. */
3234 if (FLAGS_SET(a
, UNIT_ATOM_BEFORE
) && other
->type
== UNIT_DEVICE
) {
3235 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3239 if (FLAGS_SET(a
, UNIT_ATOM_ON_FAILURE
) && !UNIT_VTABLE(u
)->can_fail
) {
3240 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3244 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERS
) && !UNIT_VTABLE(u
)->can_trigger
)
3245 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3246 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3247 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERED_BY
) && !UNIT_VTABLE(other
)->can_trigger
)
3248 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3249 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3251 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && other
->type
!= UNIT_SLICE
)
3252 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3253 "Requested dependency Slice=%s refused (%s is not a slice unit).", other
->id
, other
->id
);
3254 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && u
->type
!= UNIT_SLICE
)
3255 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3256 "Requested dependency SliceOf=%s refused (%s is not a slice unit).", other
->id
, u
->id
);
3258 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && !UNIT_HAS_CGROUP_CONTEXT(u
))
3259 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3260 "Requested dependency Slice=%s refused (%s is not a cgroup unit).", other
->id
, u
->id
);
3262 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && !UNIT_HAS_CGROUP_CONTEXT(other
))
3263 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3264 "Requested dependency SliceOf=%s refused (%s is not a cgroup unit).", other
->id
, other
->id
);
3266 r
= unit_add_dependency_impl(u
, d
, other
, mask
);
3271 if (add_reference
) {
3272 r
= unit_add_dependency_impl(u
, UNIT_REFERENCES
, other
, mask
);
3278 if (FLAGS_SET(notify_flags
, NOTIFY_DEPENDENCY_UPDATE_FROM
))
3279 unit_add_to_dbus_queue(u
);
3280 if (FLAGS_SET(notify_flags
, NOTIFY_DEPENDENCY_UPDATE_TO
))
3281 unit_add_to_dbus_queue(other
);
3283 return notify_flags
!= 0;
3286 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3290 assert(d
>= 0 || e
>= 0);
3293 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3299 s
= unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3304 return r
> 0 || s
> 0;
3307 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3315 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3322 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3324 _cleanup_free_
char *i
= NULL
;
3326 r
= unit_name_to_prefix(u
->id
, &i
);
3330 r
= unit_name_replace_instance(name
, i
, buf
);
3339 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3340 _cleanup_free_
char *buf
= NULL
;
3347 r
= resolve_template(u
, name
, &buf
, &name
);
3351 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3354 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3358 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3361 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3362 _cleanup_free_
char *buf
= NULL
;
3369 r
= resolve_template(u
, name
, &buf
, &name
);
3373 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3376 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3380 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3383 int set_unit_path(const char *p
) {
3384 /* This is mostly for debug purposes */
3385 return RET_NERRNO(setenv("SYSTEMD_UNIT_PATH", p
, 1));
3388 char *unit_dbus_path(Unit
*u
) {
3394 return unit_dbus_path_from_name(u
->id
);
3397 char *unit_dbus_path_invocation_id(Unit
*u
) {
3400 if (sd_id128_is_null(u
->invocation_id
))
3403 return unit_dbus_path_from_name(u
->invocation_id_string
);
3406 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3411 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3413 if (sd_id128_equal(u
->invocation_id
, id
))
3416 if (!sd_id128_is_null(u
->invocation_id
))
3417 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3419 if (sd_id128_is_null(id
)) {
3424 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3428 u
->invocation_id
= id
;
3429 sd_id128_to_string(id
, u
->invocation_id_string
);
3431 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3438 u
->invocation_id
= SD_ID128_NULL
;
3439 u
->invocation_id_string
[0] = 0;
3443 int unit_set_slice(Unit
*u
, Unit
*slice
) {
3449 /* Sets the unit slice if it has not been set before. Is extra careful, to only allow this for units
3450 * that actually have a cgroup context. Also, we don't allow to set this for slices (since the parent
3451 * slice is derived from the name). Make sure the unit we set is actually a slice. */
3453 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3456 if (u
->type
== UNIT_SLICE
)
3459 if (unit_active_state(u
) != UNIT_INACTIVE
)
3462 if (slice
->type
!= UNIT_SLICE
)
3465 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3466 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3469 if (UNIT_GET_SLICE(u
) == slice
)
3472 /* Disallow slice changes if @u is already bound to cgroups */
3473 if (UNIT_GET_SLICE(u
) && u
->cgroup_realized
)
3476 /* Remove any slices assigned prior; we should only have one UNIT_IN_SLICE dependency */
3477 if (UNIT_GET_SLICE(u
))
3478 unit_remove_dependencies(u
, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3480 r
= unit_add_dependency(u
, UNIT_IN_SLICE
, slice
, true, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3487 int unit_set_default_slice(Unit
*u
) {
3488 const char *slice_name
;
3494 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3497 if (UNIT_GET_SLICE(u
))
3501 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3503 /* Implicitly place all instantiated units in their
3504 * own per-template slice */
3506 r
= unit_name_to_prefix(u
->id
, &prefix
);
3510 /* The prefix is already escaped, but it might include
3511 * "-" which has a special meaning for slice units,
3512 * hence escape it here extra. */
3513 escaped
= unit_name_escape(prefix
);
3517 if (MANAGER_IS_SYSTEM(u
->manager
))
3518 slice_name
= strjoina("system-", escaped
, ".slice");
3520 slice_name
= strjoina("app-", escaped
, ".slice");
3522 } else if (unit_is_extrinsic(u
))
3523 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3524 * the root slice. They don't really belong in one of the subslices. */
3525 slice_name
= SPECIAL_ROOT_SLICE
;
3527 else if (MANAGER_IS_SYSTEM(u
->manager
))
3528 slice_name
= SPECIAL_SYSTEM_SLICE
;
3530 slice_name
= SPECIAL_APP_SLICE
;
3532 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3536 return unit_set_slice(u
, slice
);
3539 const char *unit_slice_name(Unit
*u
) {
3543 slice
= UNIT_GET_SLICE(u
);
3550 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3551 _cleanup_free_
char *t
= NULL
;
3558 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3561 if (unit_has_name(u
, t
))
3564 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3565 assert(r
< 0 || *_found
!= u
);
3569 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3570 const char *new_owner
;
3571 Unit
*u
= ASSERT_PTR(userdata
);
3576 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3578 bus_log_parse_error(r
);
3582 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3583 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3588 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3589 const sd_bus_error
*e
;
3590 const char *new_owner
;
3591 Unit
*u
= ASSERT_PTR(userdata
);
3596 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3598 e
= sd_bus_message_get_error(message
);
3600 if (!sd_bus_error_has_name(e
, SD_BUS_ERROR_NAME_HAS_NO_OWNER
)) {
3601 r
= sd_bus_error_get_errno(e
);
3602 log_unit_error_errno(u
, r
,
3603 "Unexpected error response from GetNameOwner(): %s",
3604 bus_error_message(e
, r
));
3609 r
= sd_bus_message_read(message
, "s", &new_owner
);
3611 return bus_log_parse_error(r
);
3613 assert(!isempty(new_owner
));
3616 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3617 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3622 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3623 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
*m
= NULL
;
3625 usec_t timeout_usec
= 0;
3632 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3635 /* NameOwnerChanged and GetNameOwner is used to detect when a service finished starting up. The dbus
3636 * call timeout shouldn't be earlier than that. If we couldn't get the start timeout, use the default
3637 * value defined above. */
3638 if (UNIT_VTABLE(u
)->get_timeout_start_usec
)
3639 timeout_usec
= UNIT_VTABLE(u
)->get_timeout_start_usec(u
);
3641 match
= strjoina("type='signal',"
3642 "sender='org.freedesktop.DBus',"
3643 "path='/org/freedesktop/DBus',"
3644 "interface='org.freedesktop.DBus',"
3645 "member='NameOwnerChanged',"
3646 "arg0='", name
, "'");
3648 r
= bus_add_match_full(
3653 signal_name_owner_changed
,
3660 r
= sd_bus_message_new_method_call(
3663 "org.freedesktop.DBus",
3664 "/org/freedesktop/DBus",
3665 "org.freedesktop.DBus",
3670 r
= sd_bus_message_append(m
, "s", name
);
3674 r
= sd_bus_call_async(
3676 &u
->get_name_owner_slot
,
3678 get_name_owner_handler
,
3683 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3687 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3691 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3697 /* Watch a specific name on the bus. We only support one unit
3698 * watching each name for now. */
3700 if (u
->manager
->api_bus
) {
3701 /* If the bus is already available, install the match directly.
3702 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3703 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3705 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3708 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3710 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3711 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3712 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3718 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3722 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3723 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3724 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3727 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3728 _cleanup_free_
char *e
= NULL
;
3734 /* Adds in links to the device node that this unit is based on */
3738 if (!is_device_path(what
))
3741 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3742 if (!unit_type_supported(UNIT_DEVICE
))
3745 r
= unit_name_from_path(what
, ".device", &e
);
3749 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3753 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3754 dep
= UNIT_BINDS_TO
;
3756 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3757 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3758 device
, true, mask
);
3761 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3762 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3770 if (!path_startswith(what
, "/dev/"))
3773 /* If we don't support devices, then also don't bother with blockdev@.target */
3774 if (!unit_type_supported(UNIT_DEVICE
))
3777 r
= unit_name_path_escape(what
, &escaped
);
3781 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3785 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3788 int unit_coldplug(Unit
*u
) {
3793 /* Make sure we don't enter a loop, when coldplugging recursively. */
3797 u
->coldplugged
= true;
3799 STRV_FOREACH(i
, u
->deserialized_refs
) {
3800 q
= bus_unit_track_add_name(u
, *i
);
3801 if (q
< 0 && r
>= 0)
3804 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3806 if (UNIT_VTABLE(u
)->coldplug
) {
3807 q
= UNIT_VTABLE(u
)->coldplug(u
);
3808 if (q
< 0 && r
>= 0)
3813 q
= job_coldplug(u
->job
);
3814 if (q
< 0 && r
>= 0)
3818 q
= job_coldplug(u
->nop_job
);
3819 if (q
< 0 && r
>= 0)
3826 void unit_catchup(Unit
*u
) {
3829 if (UNIT_VTABLE(u
)->catchup
)
3830 UNIT_VTABLE(u
)->catchup(u
);
3832 unit_cgroup_catchup(u
);
3835 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3841 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3842 * are never out-of-date. */
3843 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3846 if (stat(path
, &st
) < 0)
3847 /* What, cannot access this anymore? */
3851 /* For masked files check if they are still so */
3852 return !null_or_empty(&st
);
3854 /* For non-empty files check the mtime */
3855 return timespec_load(&st
.st_mtim
) > mtime
;
3860 bool unit_need_daemon_reload(Unit
*u
) {
3861 _cleanup_strv_free_
char **t
= NULL
;
3865 /* For unit files, we allow masking… */
3866 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3867 u
->load_state
== UNIT_MASKED
))
3870 /* Source paths should not be masked… */
3871 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3874 if (u
->load_state
== UNIT_LOADED
)
3875 (void) unit_find_dropin_paths(u
, &t
);
3876 if (!strv_equal(u
->dropin_paths
, t
))
3879 /* … any drop-ins that are masked are simply omitted from the list. */
3880 STRV_FOREACH(path
, u
->dropin_paths
)
3881 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3887 void unit_reset_failed(Unit
*u
) {
3890 if (UNIT_VTABLE(u
)->reset_failed
)
3891 UNIT_VTABLE(u
)->reset_failed(u
);
3893 ratelimit_reset(&u
->start_ratelimit
);
3894 u
->start_limit_hit
= false;
3897 Unit
*unit_following(Unit
*u
) {
3900 if (UNIT_VTABLE(u
)->following
)
3901 return UNIT_VTABLE(u
)->following(u
);
3906 bool unit_stop_pending(Unit
*u
) {
3909 /* This call does check the current state of the unit. It's
3910 * hence useful to be called from state change calls of the
3911 * unit itself, where the state isn't updated yet. This is
3912 * different from unit_inactive_or_pending() which checks both
3913 * the current state and for a queued job. */
3915 return unit_has_job_type(u
, JOB_STOP
);
3918 bool unit_inactive_or_pending(Unit
*u
) {
3921 /* Returns true if the unit is inactive or going down */
3923 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3926 if (unit_stop_pending(u
))
3932 bool unit_active_or_pending(Unit
*u
) {
3935 /* Returns true if the unit is active or going up */
3937 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3941 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3947 bool unit_will_restart_default(Unit
*u
) {
3950 return unit_has_job_type(u
, JOB_START
);
3953 bool unit_will_restart(Unit
*u
) {
3956 if (!UNIT_VTABLE(u
)->will_restart
)
3959 return UNIT_VTABLE(u
)->will_restart(u
);
3962 void unit_notify_cgroup_oom(Unit
*u
, bool managed_oom
) {
3965 if (UNIT_VTABLE(u
)->notify_cgroup_oom
)
3966 UNIT_VTABLE(u
)->notify_cgroup_oom(u
, managed_oom
);
3969 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3970 _cleanup_set_free_ Set
*pid_set
= NULL
;
3973 pid_set
= set_new(NULL
);
3977 /* Exclude the main/control pids from being killed via the cgroup */
3979 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3984 if (control_pid
> 0) {
3985 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3990 return TAKE_PTR(pid_set
);
3993 static int kill_common_log(pid_t pid
, int signo
, void *userdata
) {
3994 _cleanup_free_
char *comm
= NULL
;
3995 Unit
*u
= ASSERT_PTR(userdata
);
3997 (void) get_process_comm(pid
, &comm
);
3998 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
3999 signal_to_string(signo
), pid
, strna(comm
));
4004 static int kill_or_sigqueue(PidRef
* pidref
, int signo
, int code
, int value
) {
4005 assert(pidref_is_set(pidref
));
4006 assert(SIGNAL_VALID(signo
));
4011 log_debug("Killing " PID_FMT
" with signal SIG%s.", pidref
->pid
, signal_to_string(signo
));
4012 return pidref_kill(pidref
, signo
);
4015 log_debug("Enqueuing value %i to " PID_FMT
" on signal SIG%s.", value
, pidref
->pid
, signal_to_string(signo
));
4016 return pidref_sigqueue(pidref
, signo
, value
);
4019 assert_not_reached();
4029 sd_bus_error
*error
) {
4031 PidRef
*main_pid
, *control_pid
;
4032 bool killed
= false;
4035 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
4036 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
4037 * stop a service ourselves. */
4041 assert(who
< _KILL_WHO_MAX
);
4042 assert(SIGNAL_VALID(signo
));
4043 assert(IN_SET(code
, SI_USER
, SI_QUEUE
));
4045 main_pid
= unit_main_pid(u
);
4046 control_pid
= unit_control_pid(u
);
4048 if (!UNIT_HAS_CGROUP_CONTEXT(u
) && !main_pid
&& !control_pid
)
4049 return sd_bus_error_setf(error
, SD_BUS_ERROR_NOT_SUPPORTED
, "Unit type does not support process killing.");
4051 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
4053 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
4054 if (!pidref_is_set(main_pid
))
4055 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
4058 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
4060 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
4061 if (!pidref_is_set(control_pid
))
4062 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
4065 if (pidref_is_set(control_pid
) &&
4066 IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
)) {
4067 _cleanup_free_
char *comm
= NULL
;
4068 (void) get_process_comm(control_pid
->pid
, &comm
);
4070 r
= kill_or_sigqueue(control_pid
, signo
, code
, value
);
4074 /* Report this failure both to the logs and to the client */
4075 sd_bus_error_set_errnof(
4077 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
4078 signal_to_string(signo
), control_pid
->pid
, strna(comm
));
4079 log_unit_warning_errno(
4081 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
4082 signal_to_string(signo
), control_pid
->pid
, strna(comm
));
4084 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
4085 signal_to_string(signo
), control_pid
->pid
, strna(comm
));
4090 if (pidref_is_set(main_pid
) &&
4091 IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
)) {
4093 _cleanup_free_
char *comm
= NULL
;
4094 (void) get_process_comm(main_pid
->pid
, &comm
);
4096 r
= kill_or_sigqueue(main_pid
, signo
, code
, value
);
4101 sd_bus_error_set_errnof(
4103 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
4104 signal_to_string(signo
), main_pid
->pid
, strna(comm
));
4107 log_unit_warning_errno(
4109 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
4110 signal_to_string(signo
), main_pid
->pid
, strna(comm
));
4113 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
4114 signal_to_string(signo
), main_pid
->pid
, strna(comm
));
4119 /* Note: if we shall enqueue rather than kill we won't do this via the cgroup mechanism, since it
4120 * doesn't really make much sense (and given that enqueued values are a relatively expensive
4121 * resource, and we shouldn't allow us to be subjects for such allocation sprees) */
4122 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
&& code
== SI_USER
) {
4123 _cleanup_set_free_ Set
*pid_set
= NULL
;
4125 /* Exclude the main/control pids from being killed via the cgroup */
4126 pid_set
= unit_pid_set(main_pid
? main_pid
->pid
: 0, control_pid
? control_pid
->pid
: 0);
4130 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
4132 if (!IN_SET(r
, -ESRCH
, -ENOENT
)) {
4136 sd_bus_error_set_errnof(
4138 "Failed to send signal SIG%s to auxiliary processes: %m",
4139 signal_to_string(signo
));
4142 log_unit_warning_errno(
4144 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
4145 signal_to_string(signo
));
4151 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
4152 if (ret
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
4153 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
4158 int unit_following_set(Unit
*u
, Set
**s
) {
4162 if (UNIT_VTABLE(u
)->following_set
)
4163 return UNIT_VTABLE(u
)->following_set(u
, s
);
4169 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
4174 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
4175 r
= unit_file_get_state(
4176 u
->manager
->runtime_scope
,
4179 &u
->unit_file_state
);
4181 u
->unit_file_state
= UNIT_FILE_BAD
;
4184 return u
->unit_file_state
;
4187 PresetAction
unit_get_unit_file_preset(Unit
*u
) {
4192 if (u
->unit_file_preset
< 0 && u
->fragment_path
) {
4193 _cleanup_free_
char *bn
= NULL
;
4195 r
= path_extract_filename(u
->fragment_path
, &bn
);
4197 return (u
->unit_file_preset
= r
);
4199 if (r
== O_DIRECTORY
)
4200 return (u
->unit_file_preset
= -EISDIR
);
4202 u
->unit_file_preset
= unit_file_query_preset(
4203 u
->manager
->runtime_scope
,
4209 return u
->unit_file_preset
;
4212 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
4218 unit_ref_unset(ref
);
4220 ref
->source
= source
;
4221 ref
->target
= target
;
4222 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
4226 void unit_ref_unset(UnitRef
*ref
) {
4232 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
4233 * be unreferenced now. */
4234 unit_add_to_gc_queue(ref
->target
);
4236 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
4237 ref
->source
= ref
->target
= NULL
;
4240 static int user_from_unit_name(Unit
*u
, char **ret
) {
4242 static const uint8_t hash_key
[] = {
4243 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4244 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4247 _cleanup_free_
char *n
= NULL
;
4250 r
= unit_name_to_prefix(u
->id
, &n
);
4254 if (valid_user_group_name(n
, 0)) {
4259 /* If we can't use the unit name as a user name, then let's hash it and use that */
4260 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4266 int unit_patch_contexts(Unit
*u
) {
4273 /* Patch in the manager defaults into the exec and cgroup
4274 * contexts, _after_ the rest of the settings have been
4277 ec
= unit_get_exec_context(u
);
4279 /* This only copies in the ones that need memory */
4280 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
4281 if (u
->manager
->defaults
.rlimit
[i
] && !ec
->rlimit
[i
]) {
4282 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->defaults
.rlimit
[i
], 1);
4287 if (MANAGER_IS_USER(u
->manager
) &&
4288 !ec
->working_directory
) {
4290 r
= get_home_dir(&ec
->working_directory
);
4294 /* Allow user services to run, even if the
4295 * home directory is missing */
4296 ec
->working_directory_missing_ok
= true;
4299 if (ec
->private_devices
)
4300 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4302 if (ec
->protect_kernel_modules
)
4303 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4305 if (ec
->protect_kernel_logs
)
4306 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4308 if (ec
->protect_clock
)
4309 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4311 if (ec
->dynamic_user
) {
4313 r
= user_from_unit_name(u
, &ec
->user
);
4319 ec
->group
= strdup(ec
->user
);
4324 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4325 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4328 ec
->private_tmp
= true;
4329 ec
->remove_ipc
= true;
4330 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4331 if (ec
->protect_home
== PROTECT_HOME_NO
)
4332 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4334 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4336 ec
->no_new_privileges
= true;
4337 ec
->restrict_suid_sgid
= true;
4340 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++)
4341 exec_directory_sort(ec
->directories
+ dt
);
4344 cc
= unit_get_cgroup_context(u
);
4347 if (ec
->private_devices
&&
4348 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4349 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4351 /* Only add these if needed, as they imply that everything else is blocked. */
4352 if (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
) {
4353 if (ec
->root_image
|| ec
->mount_images
) {
4355 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4356 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4357 r
= cgroup_add_device_allow(cc
, p
, "rw");
4361 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4362 r
= cgroup_add_device_allow(cc
, p
, "rwm");
4367 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4368 * Same for mapper and verity. */
4369 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4370 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4376 if (ec
->protect_clock
) {
4377 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4382 /* If there are encrypted credentials we might need to access the TPM. */
4383 if (exec_context_has_encrypted_credentials(ec
)) {
4384 r
= cgroup_add_device_allow(cc
, "char-tpm", "rw");
4394 ExecContext
*unit_get_exec_context(const Unit
*u
) {
4401 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4405 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4408 KillContext
*unit_get_kill_context(Unit
*u
) {
4415 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4419 return (KillContext
*) ((uint8_t*) u
+ offset
);
4422 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4428 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4432 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4435 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4441 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4445 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4448 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4451 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4454 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4455 return u
->manager
->lookup_paths
.transient
;
4457 if (flags
& UNIT_PERSISTENT
)
4458 return u
->manager
->lookup_paths
.persistent_control
;
4460 if (flags
& UNIT_RUNTIME
)
4461 return u
->manager
->lookup_paths
.runtime_control
;
4466 const char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4468 assert(popcount(flags
& (UNIT_ESCAPE_EXEC_SYNTAX_ENV
| UNIT_ESCAPE_EXEC_SYNTAX
| UNIT_ESCAPE_C
)) <= 1);
4471 _cleanup_free_
char *t
= NULL
;
4473 /* Returns a string with any escaping done. If no escaping was necessary, *buf is set to NULL, and
4474 * the input pointer is returned as-is. If an allocation was needed, the return buffer pointer is
4475 * written to *buf. This means the return value always contains a properly escaped version, but *buf
4476 * only contains a pointer if an allocation was made. Callers can use this to optimize memory
4479 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4480 t
= specifier_escape(s
);
4487 /* We either do C-escaping or shell-escaping, to additionally escape characters that we parse for
4488 * ExecStart= and friends, i.e. '$' and quotes. */
4490 if (flags
& (UNIT_ESCAPE_EXEC_SYNTAX_ENV
| UNIT_ESCAPE_EXEC_SYNTAX
)) {
4493 if (flags
& UNIT_ESCAPE_EXEC_SYNTAX_ENV
) {
4494 t2
= strreplace(s
, "$", "$$");
4497 free_and_replace(t
, t2
);
4500 t2
= shell_escape(t
?: s
, "\"");
4503 free_and_replace(t
, t2
);
4507 } else if (flags
& UNIT_ESCAPE_C
) {
4513 free_and_replace(t
, t2
);
4522 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4523 _cleanup_free_
char *result
= NULL
;
4526 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command
4527 * lines in a way suitable for ExecStart= stanzas. */
4529 STRV_FOREACH(i
, l
) {
4530 _cleanup_free_
char *buf
= NULL
;
4535 p
= unit_escape_setting(*i
, flags
, &buf
);
4539 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4540 if (!GREEDY_REALLOC(result
, n
+ a
+ 1))
4554 if (!GREEDY_REALLOC(result
, n
+ 1))
4559 return TAKE_PTR(result
);
4562 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4563 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4564 const char *dir
, *wrapped
;
4571 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4574 data
= unit_escape_setting(data
, flags
, &escaped
);
4578 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4579 * previous section header is the same */
4581 if (flags
& UNIT_PRIVATE
) {
4582 if (!UNIT_VTABLE(u
)->private_section
)
4585 if (!u
->transient_file
|| u
->last_section_private
< 0)
4586 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4587 else if (u
->last_section_private
== 0)
4588 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4590 if (!u
->transient_file
|| u
->last_section_private
< 0)
4591 data
= strjoina("[Unit]\n", data
);
4592 else if (u
->last_section_private
> 0)
4593 data
= strjoina("\n[Unit]\n", data
);
4596 if (u
->transient_file
) {
4597 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4598 * write to the transient unit file. */
4599 fputs(data
, u
->transient_file
);
4601 if (!endswith(data
, "\n"))
4602 fputc('\n', u
->transient_file
);
4604 /* Remember which section we wrote this entry to */
4605 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4609 dir
= unit_drop_in_dir(u
, flags
);
4613 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4614 "# or an equivalent operation. Do not edit.\n",
4618 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4622 (void) mkdir_p_label(p
, 0755);
4624 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4625 * recreate the cache after every drop-in we write. */
4626 if (u
->manager
->unit_path_cache
) {
4627 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4632 r
= write_string_file_atomic_label(q
, wrapped
);
4636 r
= strv_push(&u
->dropin_paths
, q
);
4641 strv_uniq(u
->dropin_paths
);
4643 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4648 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4649 _cleanup_free_
char *p
= NULL
;
4657 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4660 va_start(ap
, format
);
4661 r
= vasprintf(&p
, format
, ap
);
4667 return unit_write_setting(u
, flags
, name
, p
);
4670 int unit_make_transient(Unit
*u
) {
4671 _cleanup_free_
char *path
= NULL
;
4676 if (!UNIT_VTABLE(u
)->can_transient
)
4679 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4681 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4685 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4686 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4689 f
= fopen(path
, "we");
4694 safe_fclose(u
->transient_file
);
4695 u
->transient_file
= f
;
4697 free_and_replace(u
->fragment_path
, path
);
4699 u
->source_path
= mfree(u
->source_path
);
4700 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4701 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4703 u
->load_state
= UNIT_STUB
;
4705 u
->transient
= true;
4707 unit_add_to_dbus_queue(u
);
4708 unit_add_to_gc_queue(u
);
4710 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4716 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4717 _cleanup_free_
char *comm
= NULL
;
4719 (void) get_process_comm(pid
, &comm
);
4721 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4722 only, like for example systemd's own PAM stub process. */
4723 if (comm
&& comm
[0] == '(')
4724 /* Although we didn't log anything, as this callback is used in unit_kill_context we must return 1
4725 * here to let the manager know that a process was killed. */
4728 log_unit_notice(userdata
,
4729 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4732 signal_to_string(sig
));
4737 static int operation_to_signal(
4738 const KillContext
*c
,
4740 bool *ret_noteworthy
) {
4746 case KILL_TERMINATE
:
4747 case KILL_TERMINATE_AND_LOG
:
4748 *ret_noteworthy
= false;
4749 return c
->kill_signal
;
4752 *ret_noteworthy
= false;
4753 return restart_kill_signal(c
);
4756 *ret_noteworthy
= true;
4757 return c
->final_kill_signal
;
4760 *ret_noteworthy
= true;
4761 return c
->watchdog_signal
;
4764 assert_not_reached();
4768 int unit_kill_context(
4773 PidRef
* control_pid
,
4774 bool main_pid_alien
) {
4776 bool wait_for_exit
= false, send_sighup
;
4777 cg_kill_log_func_t log_func
= NULL
;
4783 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
4784 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
4785 * which is used for user-requested killing of unit processes. */
4787 if (c
->kill_mode
== KILL_NONE
)
4791 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4793 log_func
= log_kill
;
4797 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4800 if (pidref_is_set(main_pid
)) {
4802 log_func(main_pid
->pid
, sig
, u
);
4804 r
= pidref_kill_and_sigcont(main_pid
, sig
);
4805 if (r
< 0 && r
!= -ESRCH
) {
4806 _cleanup_free_
char *comm
= NULL
;
4807 (void) get_process_comm(main_pid
->pid
, &comm
);
4809 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
->pid
, strna(comm
));
4811 if (!main_pid_alien
)
4812 wait_for_exit
= true;
4814 if (r
!= -ESRCH
&& send_sighup
)
4815 (void) pidref_kill(main_pid
, SIGHUP
);
4819 if (pidref_is_set(control_pid
)) {
4821 log_func(control_pid
->pid
, sig
, u
);
4823 r
= pidref_kill_and_sigcont(control_pid
, sig
);
4824 if (r
< 0 && r
!= -ESRCH
) {
4825 _cleanup_free_
char *comm
= NULL
;
4826 (void) get_process_comm(control_pid
->pid
, &comm
);
4828 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
->pid
, strna(comm
));
4830 wait_for_exit
= true;
4832 if (r
!= -ESRCH
&& send_sighup
)
4833 (void) pidref_kill(control_pid
, SIGHUP
);
4837 if (u
->cgroup_path
&&
4838 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4839 _cleanup_set_free_ Set
*pid_set
= NULL
;
4841 /* Exclude the main/control pids from being killed via the cgroup */
4842 pid_set
= unit_pid_set(main_pid
? main_pid
->pid
: 0, control_pid
? control_pid
->pid
: 0);
4846 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4848 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4852 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4853 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
4857 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4858 * we are running in a container or if this is a delegation unit, simply because cgroup
4859 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4860 * of containers it can be confused easily by left-over directories in the cgroup — which
4861 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4862 * there we get proper events. Hence rely on them. */
4864 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4865 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4866 wait_for_exit
= true;
4871 pid_set
= unit_pid_set(main_pid
? main_pid
->pid
: 0, control_pid
? control_pid
->pid
: 0);
4875 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4884 return wait_for_exit
;
4887 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4893 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these
4894 * paths in the unit (from the path to the UnitDependencyInfo structure indicating how to the
4895 * dependency came to be). However, we build a prefix table for all possible prefixes so that new
4896 * appearing mount units can easily determine which units to make themselves a dependency of. */
4898 if (!path_is_absolute(path
))
4901 if (hashmap_contains(u
->requires_mounts_for
, path
)) /* Exit quickly if the path is already covered. */
4904 _cleanup_free_
char *p
= strdup(path
);
4908 /* Use the canonical form of the path as the stored key. We call path_is_normalized()
4909 * only after simplification, since path_is_normalized() rejects paths with '.'.
4910 * path_is_normalized() also verifies that the path fits in PATH_MAX. */
4911 path
= path_simplify(p
);
4913 if (!path_is_normalized(path
))
4916 UnitDependencyInfo di
= {
4920 r
= hashmap_ensure_put(&u
->requires_mounts_for
, &path_hash_ops
, p
, di
.data
);
4924 TAKE_PTR(p
); /* path remains a valid pointer to the string stored in the hashmap */
4926 char prefix
[strlen(path
) + 1];
4927 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4930 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4932 _cleanup_free_
char *q
= NULL
;
4934 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4946 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4962 int unit_setup_exec_runtime(Unit
*u
) {
4963 _cleanup_(exec_shared_runtime_unrefp
) ExecSharedRuntime
*esr
= NULL
;
4964 _cleanup_(dynamic_creds_unrefp
) DynamicCreds
*dcreds
= NULL
;
4965 _cleanup_set_free_ Set
*units
= NULL
;
4972 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4975 /* Check if there already is an ExecRuntime for this unit? */
4976 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4980 ec
= unit_get_exec_context(u
);
4983 r
= unit_get_transitive_dependency_set(u
, UNIT_ATOM_JOINS_NAMESPACE_OF
, &units
);
4987 /* Try to get it from somebody else */
4988 SET_FOREACH(other
, units
) {
4989 r
= exec_shared_runtime_acquire(u
->manager
, NULL
, other
->id
, false, &esr
);
4997 r
= exec_shared_runtime_acquire(u
->manager
, ec
, u
->id
, true, &esr
);
5002 if (ec
->dynamic_user
) {
5003 r
= dynamic_creds_make(u
->manager
, ec
->user
, ec
->group
, &dcreds
);
5008 r
= exec_runtime_make(u
, ec
, esr
, dcreds
, rt
);
5018 bool unit_type_supported(UnitType t
) {
5019 static int8_t cache
[_UNIT_TYPE_MAX
] = {}; /* -1: disabled, 1: enabled: 0: don't know */
5022 if (_unlikely_(t
< 0))
5024 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
5027 if (cache
[t
] == 0) {
5030 e
= strjoina("SYSTEMD_SUPPORT_", unit_type_to_string(t
));
5032 r
= getenv_bool(ascii_strupper(e
));
5033 if (r
< 0 && r
!= -ENXIO
)
5034 log_debug_errno(r
, "Failed to parse $%s, ignoring: %m", e
);
5036 cache
[t
] = r
== 0 ? -1 : 1;
5041 if (!unit_vtable
[t
]->supported
)
5044 return unit_vtable
[t
]->supported();
5047 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
5053 if (!unit_log_level_test(u
, LOG_NOTICE
))
5056 r
= dir_is_empty(where
, /* ignore_hidden_or_backup= */ false);
5057 if (r
> 0 || r
== -ENOTDIR
)
5060 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
5064 log_unit_struct(u
, LOG_NOTICE
,
5065 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
5066 LOG_UNIT_INVOCATION_ID(u
),
5067 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
5071 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
5072 _cleanup_free_
char *canonical_where
= NULL
;
5078 r
= chase(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
5080 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
5084 /* We will happily ignore a trailing slash (or any redundant slashes) */
5085 if (path_equal(where
, canonical_where
))
5088 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
5089 log_unit_struct(u
, LOG_ERR
,
5090 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
5091 LOG_UNIT_INVOCATION_ID(u
),
5092 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
5098 bool unit_is_pristine(Unit
*u
) {
5101 /* Check if the unit already exists or is already around, in a number of different ways. Note that to
5102 * cater for unit types such as slice, we are generally fine with units that are marked UNIT_LOADED
5103 * even though nothing was actually loaded, as those unit types don't require a file on disk.
5105 * Note that we don't check for drop-ins here, because we allow drop-ins for transient units
5106 * identically to non-transient units, both unit-specific and hierarchical. E.g. for a-b-c.service:
5107 * service.d/….conf, a-.service.d/….conf, a-b-.service.d/….conf, a-b-c.service.d/….conf.
5110 return IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) &&
5111 !u
->fragment_path
&&
5117 PidRef
* unit_control_pid(Unit
*u
) {
5120 if (UNIT_VTABLE(u
)->control_pid
)
5121 return UNIT_VTABLE(u
)->control_pid(u
);
5126 PidRef
* unit_main_pid(Unit
*u
) {
5129 if (UNIT_VTABLE(u
)->main_pid
)
5130 return UNIT_VTABLE(u
)->main_pid(u
);
5135 static void unit_unref_uid_internal(
5139 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
5143 assert(_manager_unref_uid
);
5145 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
5146 * gid_t are actually the same time, with the same validity rules.
5148 * Drops a reference to UID/GID from a unit. */
5150 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5151 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5153 if (!uid_is_valid(*ref_uid
))
5156 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
5157 *ref_uid
= UID_INVALID
;
5160 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
5161 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
5164 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
5165 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
5168 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
5171 unit_unref_uid(u
, destroy_now
);
5172 unit_unref_gid(u
, destroy_now
);
5175 static int unit_ref_uid_internal(
5180 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
5186 assert(uid_is_valid(uid
));
5187 assert(_manager_ref_uid
);
5189 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
5190 * are actually the same type, and have the same validity rules.
5192 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
5193 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
5196 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5197 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5199 if (*ref_uid
== uid
)
5202 if (uid_is_valid(*ref_uid
)) /* Already set? */
5205 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
5213 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
5214 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
5217 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
5218 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
5221 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
5226 /* Reference both a UID and a GID in one go. Either references both, or neither. */
5228 if (uid_is_valid(uid
)) {
5229 r
= unit_ref_uid(u
, uid
, clean_ipc
);
5234 if (gid_is_valid(gid
)) {
5235 q
= unit_ref_gid(u
, gid
, clean_ipc
);
5238 unit_unref_uid(u
, false);
5244 return r
> 0 || q
> 0;
5247 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
5253 c
= unit_get_exec_context(u
);
5255 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
5257 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
5262 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
5267 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
5268 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
5269 * objects when no service references the UID/GID anymore. */
5271 r
= unit_ref_uid_gid(u
, uid
, gid
);
5273 unit_add_to_dbus_queue(u
);
5276 int unit_acquire_invocation_id(Unit
*u
) {
5282 r
= sd_id128_randomize(&id
);
5284 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
5286 r
= unit_set_invocation_id(u
, id
);
5288 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
5290 unit_add_to_dbus_queue(u
);
5294 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
5300 /* Copy parameters from manager */
5301 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
5305 p
->runtime_scope
= u
->manager
->runtime_scope
;
5307 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
5308 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
5309 p
->prefix
= u
->manager
->prefix
;
5310 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
5312 /* Copy parameters from unit */
5313 p
->cgroup_path
= u
->cgroup_path
;
5314 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
5316 p
->received_credentials_directory
= u
->manager
->received_credentials_directory
;
5317 p
->received_encrypted_credentials_directory
= u
->manager
->received_encrypted_credentials_directory
;
5322 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
5328 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5329 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5331 (void) unit_realize_cgroup(u
);
5333 r
= safe_fork(name
, FORK_REOPEN_LOG
|FORK_DEATHSIG
, ret
);
5337 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
);
5338 (void) ignore_signals(SIGPIPE
);
5340 if (u
->cgroup_path
) {
5341 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5343 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", empty_to_root(u
->cgroup_path
));
5351 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5358 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5362 int ret
= EXIT_SUCCESS
;
5364 STRV_FOREACH(i
, paths
) {
5365 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5367 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5375 r
= unit_watch_pid(u
, pid
, true);
5383 static void unit_update_dependency_mask(Hashmap
*deps
, Unit
*other
, UnitDependencyInfo di
) {
5387 if (di
.origin_mask
== 0 && di
.destination_mask
== 0)
5388 /* No bit set anymore, let's drop the whole entry */
5389 assert_se(hashmap_remove(deps
, other
));
5391 /* Mask was reduced, let's update the entry */
5392 assert_se(hashmap_update(deps
, other
, di
.data
) == 0);
5395 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5399 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5404 HASHMAP_FOREACH(deps
, u
->dependencies
) {
5408 UnitDependencyInfo di
;
5413 HASHMAP_FOREACH_KEY(di
.data
, other
, deps
) {
5414 Hashmap
*other_deps
;
5416 if (FLAGS_SET(~mask
, di
.origin_mask
))
5419 di
.origin_mask
&= ~mask
;
5420 unit_update_dependency_mask(deps
, other
, di
);
5422 /* We updated the dependency from our unit to the other unit now. But most
5423 * dependencies imply a reverse dependency. Hence, let's delete that one
5424 * too. For that we go through all dependency types on the other unit and
5425 * delete all those which point to us and have the right mask set. */
5427 HASHMAP_FOREACH(other_deps
, other
->dependencies
) {
5428 UnitDependencyInfo dj
;
5430 dj
.data
= hashmap_get(other_deps
, u
);
5431 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5434 dj
.destination_mask
&= ~mask
;
5435 unit_update_dependency_mask(other_deps
, u
, dj
);
5438 unit_add_to_gc_queue(other
);
5440 /* The unit 'other' may not be wanted by the unit 'u'. */
5441 unit_submit_to_stop_when_unneeded_queue(other
);
5451 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5458 if (MANAGER_IS_SYSTEM(u
->manager
))
5459 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5461 _cleanup_free_
char *user_path
= NULL
;
5462 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5465 p
= strjoin(user_path
, u
->id
);
5475 static int unit_export_invocation_id(Unit
*u
) {
5476 _cleanup_free_
char *p
= NULL
;
5481 if (u
->exported_invocation_id
)
5484 if (sd_id128_is_null(u
->invocation_id
))
5487 r
= unit_get_invocation_path(u
, &p
);
5489 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5491 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5493 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5495 u
->exported_invocation_id
= true;
5499 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5507 if (u
->exported_log_level_max
)
5510 if (c
->log_level_max
< 0)
5513 assert(c
->log_level_max
<= 7);
5515 buf
[0] = '0' + c
->log_level_max
;
5518 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5519 r
= symlink_atomic(buf
, p
);
5521 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5523 u
->exported_log_level_max
= true;
5527 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5528 _cleanup_close_
int fd
= -EBADF
;
5529 struct iovec
*iovec
;
5536 if (u
->exported_log_extra_fields
)
5539 if (c
->n_log_extra_fields
<= 0)
5542 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5543 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5545 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5546 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5548 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5549 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5552 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5553 pattern
= strjoina(p
, ".XXXXXX");
5555 fd
= mkostemp_safe(pattern
);
5557 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5559 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5561 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5565 (void) fchmod(fd
, 0644);
5567 if (rename(pattern
, p
) < 0) {
5568 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5572 u
->exported_log_extra_fields
= true;
5576 (void) unlink(pattern
);
5580 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5581 _cleanup_free_
char *buf
= NULL
;
5588 if (u
->exported_log_ratelimit_interval
)
5591 if (c
->log_ratelimit_interval_usec
== 0)
5594 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5596 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5599 r
= symlink_atomic(buf
, p
);
5601 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5603 u
->exported_log_ratelimit_interval
= true;
5607 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5608 _cleanup_free_
char *buf
= NULL
;
5615 if (u
->exported_log_ratelimit_burst
)
5618 if (c
->log_ratelimit_burst
== 0)
5621 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5623 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5626 r
= symlink_atomic(buf
, p
);
5628 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5630 u
->exported_log_ratelimit_burst
= true;
5634 void unit_export_state_files(Unit
*u
) {
5635 const ExecContext
*c
;
5642 if (MANAGER_IS_TEST_RUN(u
->manager
))
5645 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5646 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5647 * the IPC system itself and PID 1 also log to the journal.
5649 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5650 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5651 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5652 * namespace at least.
5654 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5655 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5658 (void) unit_export_invocation_id(u
);
5660 if (!MANAGER_IS_SYSTEM(u
->manager
))
5663 c
= unit_get_exec_context(u
);
5665 (void) unit_export_log_level_max(u
, c
);
5666 (void) unit_export_log_extra_fields(u
, c
);
5667 (void) unit_export_log_ratelimit_interval(u
, c
);
5668 (void) unit_export_log_ratelimit_burst(u
, c
);
5672 void unit_unlink_state_files(Unit
*u
) {
5680 /* Undoes the effect of unit_export_state() */
5682 if (u
->exported_invocation_id
) {
5683 _cleanup_free_
char *invocation_path
= NULL
;
5684 int r
= unit_get_invocation_path(u
, &invocation_path
);
5686 (void) unlink(invocation_path
);
5687 u
->exported_invocation_id
= false;
5691 if (!MANAGER_IS_SYSTEM(u
->manager
))
5694 if (u
->exported_log_level_max
) {
5695 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5698 u
->exported_log_level_max
= false;
5701 if (u
->exported_log_extra_fields
) {
5702 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5705 u
->exported_log_extra_fields
= false;
5708 if (u
->exported_log_ratelimit_interval
) {
5709 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5712 u
->exported_log_ratelimit_interval
= false;
5715 if (u
->exported_log_ratelimit_burst
) {
5716 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5719 u
->exported_log_ratelimit_burst
= false;
5723 int unit_prepare_exec(Unit
*u
) {
5728 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5729 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5730 r
= bpf_firewall_load_custom(u
);
5734 /* Prepares everything so that we can fork of a process for this unit */
5736 (void) unit_realize_cgroup(u
);
5738 if (u
->reset_accounting
) {
5739 (void) unit_reset_accounting(u
);
5740 u
->reset_accounting
= false;
5743 unit_export_state_files(u
);
5745 r
= unit_setup_exec_runtime(u
);
5752 static bool ignore_leftover_process(const char *comm
) {
5753 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5756 int unit_log_leftover_process_start(pid_t pid
, int sig
, void *userdata
) {
5757 _cleanup_free_
char *comm
= NULL
;
5759 (void) get_process_comm(pid
, &comm
);
5761 if (ignore_leftover_process(comm
))
5764 /* During start we print a warning */
5766 log_unit_warning(userdata
,
5767 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5768 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5774 int unit_log_leftover_process_stop(pid_t pid
, int sig
, void *userdata
) {
5775 _cleanup_free_
char *comm
= NULL
;
5777 (void) get_process_comm(pid
, &comm
);
5779 if (ignore_leftover_process(comm
))
5782 /* During stop we only print an informational message */
5784 log_unit_info(userdata
,
5785 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
5791 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
5794 (void) unit_pick_cgroup_path(u
);
5796 if (!u
->cgroup_path
)
5799 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_func
, u
);
5802 bool unit_needs_console(Unit
*u
) {
5804 UnitActiveState state
;
5808 state
= unit_active_state(u
);
5810 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5813 if (UNIT_VTABLE(u
)->needs_console
)
5814 return UNIT_VTABLE(u
)->needs_console(u
);
5816 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5817 ec
= unit_get_exec_context(u
);
5821 return exec_context_may_touch_console(ec
);
5824 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5829 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5830 * and not a kernel thread either */
5832 /* First, a simple range check */
5833 if (!pid_is_valid(pid
))
5834 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5836 /* Some extra safety check */
5837 if (pid
== 1 || pid
== getpid_cached())
5838 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5840 /* Don't even begin to bother with kernel threads */
5841 r
= is_kernel_thread(pid
);
5843 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5845 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5847 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5852 void unit_log_success(Unit
*u
) {
5855 /* Let's show message "Deactivated successfully" in debug mode (when manager is user) rather than in info mode.
5856 * This message has low information value for regular users and it might be a bit overwhelming on a system with
5857 * a lot of devices. */
5859 MANAGER_IS_USER(u
->manager
) ? LOG_DEBUG
: LOG_INFO
,
5860 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5861 LOG_UNIT_INVOCATION_ID(u
),
5862 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
5865 void unit_log_failure(Unit
*u
, const char *result
) {
5869 log_unit_struct(u
, LOG_WARNING
,
5870 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5871 LOG_UNIT_INVOCATION_ID(u
),
5872 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5873 "UNIT_RESULT=%s", result
);
5876 void unit_log_skip(Unit
*u
, const char *result
) {
5880 log_unit_struct(u
, LOG_INFO
,
5881 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5882 LOG_UNIT_INVOCATION_ID(u
),
5883 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5884 "UNIT_RESULT=%s", result
);
5887 void unit_log_process_exit(
5890 const char *command
,
5900 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5901 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5902 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5906 else if (code
== CLD_EXITED
)
5909 level
= LOG_WARNING
;
5911 log_unit_struct(u
, level
,
5912 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5913 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s%s",
5915 sigchld_code_to_string(code
), status
,
5916 strna(code
== CLD_EXITED
5917 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5918 : signal_to_string(status
)),
5919 success
? " (success)" : ""),
5920 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5921 "EXIT_STATUS=%i", status
,
5922 "COMMAND=%s", strna(command
),
5923 LOG_UNIT_INVOCATION_ID(u
));
5926 int unit_exit_status(Unit
*u
) {
5929 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5930 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5931 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5932 * service process has exited abnormally (signal/coredump). */
5934 if (!UNIT_VTABLE(u
)->exit_status
)
5937 return UNIT_VTABLE(u
)->exit_status(u
);
5940 int unit_failure_action_exit_status(Unit
*u
) {
5945 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5947 if (u
->failure_action_exit_status
>= 0)
5948 return u
->failure_action_exit_status
;
5950 r
= unit_exit_status(u
);
5951 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5957 int unit_success_action_exit_status(Unit
*u
) {
5962 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5964 if (u
->success_action_exit_status
>= 0)
5965 return u
->success_action_exit_status
;
5967 r
= unit_exit_status(u
);
5968 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5974 int unit_test_trigger_loaded(Unit
*u
) {
5977 /* Tests whether the unit to trigger is loaded */
5979 trigger
= UNIT_TRIGGER(u
);
5981 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5982 "Refusing to start, no unit to trigger.");
5983 if (trigger
->load_state
!= UNIT_LOADED
)
5984 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5985 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
5990 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
5994 /* EXEC_PRESERVE_RESTART is handled via unit_release_resources()! */
5995 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
)
5996 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
5998 exec_context_destroy_credentials(u
);
5999 exec_context_destroy_mount_ns_dir(u
);
6002 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
6003 UnitActiveState state
;
6007 /* Special return values:
6009 * -EOPNOTSUPP → cleaning not supported for this unit type
6010 * -EUNATCH → cleaning not defined for this resource type
6011 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
6012 * a job queued or similar
6015 if (!UNIT_VTABLE(u
)->clean
)
6021 if (u
->load_state
!= UNIT_LOADED
)
6027 state
= unit_active_state(u
);
6028 if (state
!= UNIT_INACTIVE
)
6031 return UNIT_VTABLE(u
)->clean(u
, mask
);
6034 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
6037 if (!UNIT_VTABLE(u
)->clean
||
6038 u
->load_state
!= UNIT_LOADED
) {
6043 /* When the clean() method is set, can_clean() really should be set too */
6044 assert(UNIT_VTABLE(u
)->can_clean
);
6046 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
6049 bool unit_can_freeze(Unit
*u
) {
6052 if (UNIT_VTABLE(u
)->can_freeze
)
6053 return UNIT_VTABLE(u
)->can_freeze(u
);
6055 return UNIT_VTABLE(u
)->freeze
;
6058 void unit_frozen(Unit
*u
) {
6061 u
->freezer_state
= FREEZER_FROZEN
;
6063 bus_unit_send_pending_freezer_message(u
, false);
6066 void unit_thawed(Unit
*u
) {
6069 u
->freezer_state
= FREEZER_RUNNING
;
6071 bus_unit_send_pending_freezer_message(u
, false);
6074 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
6076 int (*method
)(Unit
*);
6080 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
6082 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
6083 if (!method
|| !cg_freezer_supported())
6089 if (u
->load_state
!= UNIT_LOADED
)
6092 s
= unit_active_state(u
);
6093 if (s
!= UNIT_ACTIVE
)
6096 if ((IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
) && action
== FREEZER_FREEZE
) ||
6097 (u
->freezer_state
== FREEZER_THAWING
&& action
== FREEZER_THAW
))
6104 assert(IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
));
6109 int unit_freeze(Unit
*u
) {
6110 return unit_freezer_action(u
, FREEZER_FREEZE
);
6113 int unit_thaw(Unit
*u
) {
6114 return unit_freezer_action(u
, FREEZER_THAW
);
6117 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
6118 int unit_freeze_vtable_common(Unit
*u
) {
6119 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
6122 int unit_thaw_vtable_common(Unit
*u
) {
6123 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
6126 Condition
*unit_find_failed_condition(Unit
*u
) {
6127 Condition
*failed_trigger
= NULL
;
6128 bool has_succeeded_trigger
= false;
6130 if (u
->condition_result
)
6133 LIST_FOREACH(conditions
, c
, u
->conditions
)
6135 if (c
->result
== CONDITION_SUCCEEDED
)
6136 has_succeeded_trigger
= true;
6137 else if (!failed_trigger
)
6139 } else if (c
->result
!= CONDITION_SUCCEEDED
)
6142 return failed_trigger
&& !has_succeeded_trigger
? failed_trigger
: NULL
;
6145 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
6146 [COLLECT_INACTIVE
] = "inactive",
6147 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
6150 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);
6152 Unit
* unit_has_dependency(const Unit
*u
, UnitDependencyAtom atom
, Unit
*other
) {
6157 /* Checks if the unit has a dependency on 'other' with the specified dependency atom. If 'other' is
6158 * NULL checks if the unit has *any* dependency of that atom. Returns 'other' if found (or if 'other'
6159 * is NULL the first entry found), or NULL if not found. */
6161 UNIT_FOREACH_DEPENDENCY(i
, u
, atom
)
6162 if (!other
|| other
== i
)
6168 int unit_get_dependency_array(const Unit
*u
, UnitDependencyAtom atom
, Unit
***ret_array
) {
6169 _cleanup_free_ Unit
**array
= NULL
;
6176 /* Gets a list of units matching a specific atom as array. This is useful when iterating through
6177 * dependencies while modifying them: the array is an "atomic snapshot" of sorts, that can be read
6178 * while the dependency table is continuously updated. */
6180 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
6181 if (!GREEDY_REALLOC(array
, n
+ 1))
6187 *ret_array
= TAKE_PTR(array
);
6189 assert(n
<= INT_MAX
);
6193 int unit_get_transitive_dependency_set(Unit
*u
, UnitDependencyAtom atom
, Set
**ret
) {
6194 _cleanup_set_free_ Set
*units
= NULL
, *queue
= NULL
;
6201 /* Similar to unit_get_dependency_array(), but also search the same dependency in other units. */
6204 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
6205 r
= set_ensure_put(&units
, NULL
, other
);
6210 r
= set_ensure_put(&queue
, NULL
, other
);
6214 } while ((u
= set_steal_first(queue
)));
6216 *ret
= TAKE_PTR(units
);
6220 const ActivationDetailsVTable
* const activation_details_vtable
[_UNIT_TYPE_MAX
] = {
6221 [UNIT_PATH
] = &activation_details_path_vtable
,
6222 [UNIT_TIMER
] = &activation_details_timer_vtable
,
6225 ActivationDetails
*activation_details_new(Unit
*trigger_unit
) {
6226 _cleanup_free_ ActivationDetails
*details
= NULL
;
6228 assert(trigger_unit
);
6229 assert(trigger_unit
->type
!= _UNIT_TYPE_INVALID
);
6230 assert(trigger_unit
->id
);
6232 details
= malloc0(activation_details_vtable
[trigger_unit
->type
]->object_size
);
6236 *details
= (ActivationDetails
) {
6238 .trigger_unit_type
= trigger_unit
->type
,
6241 details
->trigger_unit_name
= strdup(trigger_unit
->id
);
6242 if (!details
->trigger_unit_name
)
6245 if (ACTIVATION_DETAILS_VTABLE(details
)->init
)
6246 ACTIVATION_DETAILS_VTABLE(details
)->init(details
, trigger_unit
);
6248 return TAKE_PTR(details
);
6251 static ActivationDetails
*activation_details_free(ActivationDetails
*details
) {
6255 if (ACTIVATION_DETAILS_VTABLE(details
)->done
)
6256 ACTIVATION_DETAILS_VTABLE(details
)->done(details
);
6258 free(details
->trigger_unit_name
);
6260 return mfree(details
);
6263 void activation_details_serialize(ActivationDetails
*details
, FILE *f
) {
6264 if (!details
|| details
->trigger_unit_type
== _UNIT_TYPE_INVALID
)
6267 (void) serialize_item(f
, "activation-details-unit-type", unit_type_to_string(details
->trigger_unit_type
));
6268 if (details
->trigger_unit_name
)
6269 (void) serialize_item(f
, "activation-details-unit-name", details
->trigger_unit_name
);
6270 if (ACTIVATION_DETAILS_VTABLE(details
)->serialize
)
6271 ACTIVATION_DETAILS_VTABLE(details
)->serialize(details
, f
);
6274 int activation_details_deserialize(const char *key
, const char *value
, ActivationDetails
**details
) {
6284 if (!streq(key
, "activation-details-unit-type"))
6287 t
= unit_type_from_string(value
);
6291 /* The activation details vtable has defined ops only for path and timer units */
6292 if (!activation_details_vtable
[t
])
6295 *details
= malloc0(activation_details_vtable
[t
]->object_size
);
6299 **details
= (ActivationDetails
) {
6301 .trigger_unit_type
= t
,
6307 if (streq(key
, "activation-details-unit-name")) {
6308 r
= free_and_strdup(&(*details
)->trigger_unit_name
, value
);
6315 if (ACTIVATION_DETAILS_VTABLE(*details
)->deserialize
)
6316 return ACTIVATION_DETAILS_VTABLE(*details
)->deserialize(key
, value
, details
);
6321 int activation_details_append_env(ActivationDetails
*details
, char ***strv
) {
6329 if (!isempty(details
->trigger_unit_name
)) {
6330 char *s
= strjoin("TRIGGER_UNIT=", details
->trigger_unit_name
);
6334 r
= strv_consume(strv
, TAKE_PTR(s
));
6339 if (ACTIVATION_DETAILS_VTABLE(details
)->append_env
) {
6340 r
= ACTIVATION_DETAILS_VTABLE(details
)->append_env(details
, strv
);
6345 return r
+ !isempty(details
->trigger_unit_name
); /* Return the number of variables added to the env block */
6348 int activation_details_append_pair(ActivationDetails
*details
, char ***strv
) {
6356 if (!isempty(details
->trigger_unit_name
)) {
6357 r
= strv_extend(strv
, "trigger_unit");
6361 r
= strv_extend(strv
, details
->trigger_unit_name
);
6366 if (ACTIVATION_DETAILS_VTABLE(details
)->append_env
) {
6367 r
= ACTIVATION_DETAILS_VTABLE(details
)->append_pair(details
, strv
);
6372 return r
+ !isempty(details
->trigger_unit_name
); /* Return the number of pairs added to the strv */
6375 DEFINE_TRIVIAL_REF_UNREF_FUNC(ActivationDetails
, activation_details
, activation_details_free
);