1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
9 #include "sd-messages.h"
11 #include "all-units.h"
12 #include "alloc-util.h"
13 #include "bpf-firewall.h"
14 #include "bpf-foreign.h"
15 #include "bpf-socket-bind.h"
16 #include "bus-common-errors.h"
18 #include "cgroup-setup.h"
19 #include "cgroup-util.h"
21 #include "core-varlink.h"
22 #include "dbus-unit.h"
29 #include "fileio-label.h"
31 #include "format-util.h"
32 #include "id128-util.h"
36 #include "load-dropin.h"
37 #include "load-fragment.h"
39 #include "logarithm.h"
41 #include "missing_audit.h"
42 #include "mkdir-label.h"
43 #include "path-util.h"
44 #include "process-util.h"
46 #include "serialize.h"
48 #include "signal-util.h"
49 #include "sparse-endian.h"
51 #include "specifier.h"
52 #include "stat-util.h"
53 #include "stdio-util.h"
54 #include "string-table.h"
55 #include "string-util.h"
57 #include "terminal-util.h"
58 #include "tmpfile-util.h"
59 #include "umask-util.h"
60 #include "unit-name.h"
62 #include "user-util.h"
68 /* Thresholds for logging at INFO level about resource consumption */
69 #define MENTIONWORTHY_CPU_NSEC (1 * NSEC_PER_SEC)
70 #define MENTIONWORTHY_IO_BYTES (1024 * 1024ULL)
71 #define MENTIONWORTHY_IP_BYTES (0ULL)
73 /* Thresholds for logging at INFO level about resource consumption */
74 #define NOTICEWORTHY_CPU_NSEC (10*60 * NSEC_PER_SEC) /* 10 minutes */
75 #define NOTICEWORTHY_IO_BYTES (10 * 1024 * 1024ULL) /* 10 MB */
76 #define NOTICEWORTHY_IP_BYTES (128 * 1024 * 1024ULL) /* 128 MB */
78 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
79 [UNIT_SERVICE
] = &service_vtable
,
80 [UNIT_SOCKET
] = &socket_vtable
,
81 [UNIT_TARGET
] = &target_vtable
,
82 [UNIT_DEVICE
] = &device_vtable
,
83 [UNIT_MOUNT
] = &mount_vtable
,
84 [UNIT_AUTOMOUNT
] = &automount_vtable
,
85 [UNIT_SWAP
] = &swap_vtable
,
86 [UNIT_TIMER
] = &timer_vtable
,
87 [UNIT_PATH
] = &path_vtable
,
88 [UNIT_SLICE
] = &slice_vtable
,
89 [UNIT_SCOPE
] = &scope_vtable
,
92 Unit
* unit_new(Manager
*m
, size_t size
) {
96 assert(size
>= sizeof(Unit
));
103 u
->type
= _UNIT_TYPE_INVALID
;
104 u
->default_dependencies
= true;
105 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
106 u
->unit_file_preset
= -1;
107 u
->on_failure_job_mode
= JOB_REPLACE
;
108 u
->on_success_job_mode
= JOB_FAIL
;
109 u
->cgroup_control_inotify_wd
= -1;
110 u
->cgroup_memory_inotify_wd
= -1;
111 u
->job_timeout
= USEC_INFINITY
;
112 u
->job_running_timeout
= USEC_INFINITY
;
113 u
->ref_uid
= UID_INVALID
;
114 u
->ref_gid
= GID_INVALID
;
115 u
->cpu_usage_last
= NSEC_INFINITY
;
116 u
->cgroup_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
117 u
->failure_action_exit_status
= u
->success_action_exit_status
= -1;
119 u
->ip_accounting_ingress_map_fd
= -EBADF
;
120 u
->ip_accounting_egress_map_fd
= -EBADF
;
121 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++)
122 u
->io_accounting_last
[i
] = UINT64_MAX
;
124 u
->ipv4_allow_map_fd
= -EBADF
;
125 u
->ipv6_allow_map_fd
= -EBADF
;
126 u
->ipv4_deny_map_fd
= -EBADF
;
127 u
->ipv6_deny_map_fd
= -EBADF
;
129 u
->last_section_private
= -1;
131 u
->start_ratelimit
= (RateLimit
) { m
->default_start_limit_interval
, m
->default_start_limit_burst
};
132 u
->auto_start_stop_ratelimit
= (const RateLimit
) { 10 * USEC_PER_SEC
, 16 };
137 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
138 _cleanup_(unit_freep
) Unit
*u
= NULL
;
141 u
= unit_new(m
, size
);
145 r
= unit_add_name(u
, name
);
154 bool unit_has_name(const Unit
*u
, const char *name
) {
158 return streq_ptr(name
, u
->id
) ||
159 set_contains(u
->aliases
, name
);
162 static void unit_init(Unit
*u
) {
169 assert(u
->type
>= 0);
171 cc
= unit_get_cgroup_context(u
);
173 cgroup_context_init(cc
);
175 /* Copy in the manager defaults into the cgroup
176 * context, _before_ the rest of the settings have
177 * been initialized */
179 cc
->cpu_accounting
= u
->manager
->default_cpu_accounting
;
180 cc
->io_accounting
= u
->manager
->default_io_accounting
;
181 cc
->blockio_accounting
= u
->manager
->default_blockio_accounting
;
182 cc
->memory_accounting
= u
->manager
->default_memory_accounting
;
183 cc
->tasks_accounting
= u
->manager
->default_tasks_accounting
;
184 cc
->ip_accounting
= u
->manager
->default_ip_accounting
;
186 if (u
->type
!= UNIT_SLICE
)
187 cc
->tasks_max
= u
->manager
->default_tasks_max
;
189 cc
->memory_pressure_watch
= u
->manager
->default_memory_pressure_watch
;
190 cc
->memory_pressure_threshold_usec
= u
->manager
->default_memory_pressure_threshold_usec
;
193 ec
= unit_get_exec_context(u
);
195 exec_context_init(ec
);
197 if (u
->manager
->default_oom_score_adjust_set
) {
198 ec
->oom_score_adjust
= u
->manager
->default_oom_score_adjust
;
199 ec
->oom_score_adjust_set
= true;
202 if (MANAGER_IS_SYSTEM(u
->manager
))
203 ec
->keyring_mode
= EXEC_KEYRING_SHARED
;
205 ec
->keyring_mode
= EXEC_KEYRING_INHERIT
;
207 /* User manager might have its umask redefined by PAM or UMask=. In this
208 * case let the units it manages inherit this value by default. They can
209 * still tune this value through their own unit file */
210 (void) get_process_umask(getpid_cached(), &ec
->umask
);
214 kc
= unit_get_kill_context(u
);
216 kill_context_init(kc
);
218 if (UNIT_VTABLE(u
)->init
)
219 UNIT_VTABLE(u
)->init(u
);
222 static int unit_add_alias(Unit
*u
, char *donated_name
) {
225 /* Make sure that u->names is allocated. We may leave u->names
226 * empty if we fail later, but this is not a problem. */
227 r
= set_ensure_put(&u
->aliases
, &string_hash_ops
, donated_name
);
235 int unit_add_name(Unit
*u
, const char *text
) {
236 _cleanup_free_
char *name
= NULL
, *instance
= NULL
;
243 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
245 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
246 "instance is not set when adding name '%s': %m", text
);
248 r
= unit_name_replace_instance(text
, u
->instance
, &name
);
250 return log_unit_debug_errno(u
, r
,
251 "failed to build instance name from '%s': %m", text
);
258 if (unit_has_name(u
, name
))
261 if (hashmap_contains(u
->manager
->units
, name
))
262 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
263 "unit already exist when adding name '%s': %m", name
);
265 if (!unit_name_is_valid(name
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
266 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
267 "name '%s' is invalid: %m", name
);
269 t
= unit_name_to_type(name
);
271 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
272 "failed to derive unit type from name '%s': %m", name
);
274 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
275 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
276 "unit type is illegal: u->type(%d) and t(%d) for name '%s': %m",
279 r
= unit_name_to_instance(name
, &instance
);
281 return log_unit_debug_errno(u
, r
, "failed to extract instance from name '%s': %m", name
);
283 if (instance
&& !unit_type_may_template(t
))
284 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
), "templates are not allowed for name '%s': %m", name
);
286 /* Ensure that this unit either has no instance, or that the instance matches. */
287 if (u
->type
!= _UNIT_TYPE_INVALID
&& !streq_ptr(u
->instance
, instance
))
288 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
289 "cannot add name %s, the instances don't match (\"%s\" != \"%s\").",
290 name
, instance
, u
->instance
);
292 if (u
->id
&& !unit_type_may_alias(t
))
293 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
294 "cannot add name %s, aliases are not allowed for %s units.",
295 name
, unit_type_to_string(t
));
297 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
298 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(E2BIG
), "cannot add name, manager has too many units: %m");
300 /* Add name to the global hashmap first, because that's easier to undo */
301 r
= hashmap_put(u
->manager
->units
, name
, u
);
303 return log_unit_debug_errno(u
, r
, "add unit to hashmap failed for name '%s': %m", text
);
306 r
= unit_add_alias(u
, name
); /* unit_add_alias() takes ownership of the name on success */
308 hashmap_remove(u
->manager
->units
, name
);
314 /* A new name, we don't need the set yet. */
315 assert(u
->type
== _UNIT_TYPE_INVALID
);
316 assert(!u
->instance
);
319 u
->id
= TAKE_PTR(name
);
320 u
->instance
= TAKE_PTR(instance
);
322 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
326 unit_add_to_dbus_queue(u
);
330 int unit_choose_id(Unit
*u
, const char *name
) {
331 _cleanup_free_
char *t
= NULL
;
338 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
342 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
349 if (streq_ptr(u
->id
, name
))
350 return 0; /* Nothing to do. */
352 /* Selects one of the aliases of this unit as the id */
353 s
= set_get(u
->aliases
, (char*) name
);
358 r
= set_remove_and_put(u
->aliases
, name
, u
->id
);
362 assert_se(set_remove(u
->aliases
, name
)); /* see set_get() above… */
364 u
->id
= s
; /* Old u->id is now stored in the set, and s is not stored anywhere */
365 unit_add_to_dbus_queue(u
);
370 int unit_set_description(Unit
*u
, const char *description
) {
375 r
= free_and_strdup(&u
->description
, empty_to_null(description
));
379 unit_add_to_dbus_queue(u
);
384 static bool unit_success_failure_handler_has_jobs(Unit
*unit
) {
387 UNIT_FOREACH_DEPENDENCY(other
, unit
, UNIT_ATOM_ON_SUCCESS
)
388 if (other
->job
|| other
->nop_job
)
391 UNIT_FOREACH_DEPENDENCY(other
, unit
, UNIT_ATOM_ON_FAILURE
)
392 if (other
->job
|| other
->nop_job
)
398 void unit_release_resources(Unit
*u
) {
399 UnitActiveState state
;
404 if (u
->job
|| u
->nop_job
)
410 state
= unit_active_state(u
);
411 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
414 if (unit_will_restart(u
))
417 ec
= unit_get_exec_context(u
);
418 if (ec
&& ec
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
)
419 exec_context_destroy_runtime_directory(ec
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
421 if (UNIT_VTABLE(u
)->release_resources
)
422 UNIT_VTABLE(u
)->release_resources(u
);
425 bool unit_may_gc(Unit
*u
) {
426 UnitActiveState state
;
431 /* Checks whether the unit is ready to be unloaded for garbage collection. Returns true when the
432 * unit may be collected, and false if there's some reason to keep it loaded.
434 * References from other units are *not* checked here. Instead, this is done in unit_gc_sweep(), but
435 * using markers to properly collect dependency loops.
438 if (u
->job
|| u
->nop_job
)
444 if (sd_bus_track_count(u
->bus_track
) > 0)
447 state
= unit_active_state(u
);
449 /* But we keep the unit object around for longer when it is referenced or configured to not be
451 switch (u
->collect_mode
) {
453 case COLLECT_INACTIVE
:
454 if (state
!= UNIT_INACTIVE
)
459 case COLLECT_INACTIVE_OR_FAILED
:
460 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
466 assert_not_reached();
469 /* Check if any OnFailure= or on Success= jobs may be pending */
470 if (unit_success_failure_handler_has_jobs(u
))
473 if (u
->cgroup_path
) {
474 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
475 * around. Units with active processes should never be collected. */
477 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
479 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", empty_to_root(u
->cgroup_path
));
484 if (!UNIT_VTABLE(u
)->may_gc
)
487 return UNIT_VTABLE(u
)->may_gc(u
);
490 void unit_add_to_load_queue(Unit
*u
) {
492 assert(u
->type
!= _UNIT_TYPE_INVALID
);
494 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
497 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
498 u
->in_load_queue
= true;
501 void unit_add_to_cleanup_queue(Unit
*u
) {
504 if (u
->in_cleanup_queue
)
507 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
508 u
->in_cleanup_queue
= true;
511 void unit_add_to_gc_queue(Unit
*u
) {
514 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
520 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
521 u
->in_gc_queue
= true;
524 void unit_add_to_dbus_queue(Unit
*u
) {
526 assert(u
->type
!= _UNIT_TYPE_INVALID
);
528 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
531 /* Shortcut things if nobody cares */
532 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
533 sd_bus_track_count(u
->bus_track
) <= 0 &&
534 set_isempty(u
->manager
->private_buses
)) {
535 u
->sent_dbus_new_signal
= true;
539 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
540 u
->in_dbus_queue
= true;
543 void unit_submit_to_stop_when_unneeded_queue(Unit
*u
) {
546 if (u
->in_stop_when_unneeded_queue
)
549 if (!u
->stop_when_unneeded
)
552 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
555 LIST_PREPEND(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
556 u
->in_stop_when_unneeded_queue
= true;
559 void unit_submit_to_start_when_upheld_queue(Unit
*u
) {
562 if (u
->in_start_when_upheld_queue
)
565 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)))
568 if (!unit_has_dependency(u
, UNIT_ATOM_START_STEADILY
, NULL
))
571 LIST_PREPEND(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
572 u
->in_start_when_upheld_queue
= true;
575 void unit_submit_to_stop_when_bound_queue(Unit
*u
) {
578 if (u
->in_stop_when_bound_queue
)
581 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
584 if (!unit_has_dependency(u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
, NULL
))
587 LIST_PREPEND(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
588 u
->in_stop_when_bound_queue
= true;
591 static bool unit_can_release_resources(Unit
*u
) {
596 if (UNIT_VTABLE(u
)->release_resources
)
599 ec
= unit_get_exec_context(u
);
600 if (ec
&& ec
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
)
606 void unit_submit_to_release_resources_queue(Unit
*u
) {
609 if (u
->in_release_resources_queue
)
612 if (u
->job
|| u
->nop_job
)
618 if (!unit_can_release_resources(u
))
621 LIST_PREPEND(release_resources_queue
, u
->manager
->release_resources_queue
, u
);
622 u
->in_release_resources_queue
= true;
625 static void unit_clear_dependencies(Unit
*u
) {
628 /* Removes all dependencies configured on u and their reverse dependencies. */
630 for (Hashmap
*deps
; (deps
= hashmap_steal_first(u
->dependencies
));) {
632 for (Unit
*other
; (other
= hashmap_steal_first_key(deps
));) {
635 HASHMAP_FOREACH(other_deps
, other
->dependencies
)
636 hashmap_remove(other_deps
, u
);
638 unit_add_to_gc_queue(other
);
644 u
->dependencies
= hashmap_free(u
->dependencies
);
647 static void unit_remove_transient(Unit
*u
) {
653 if (u
->fragment_path
)
654 (void) unlink(u
->fragment_path
);
656 STRV_FOREACH(i
, u
->dropin_paths
) {
657 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
659 if (path_extract_directory(*i
, &p
) < 0) /* Get the drop-in directory from the drop-in file */
662 if (path_extract_directory(p
, &pp
) < 0) /* Get the config directory from the drop-in directory */
665 /* Only drop transient drop-ins */
666 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
674 static void unit_free_requires_mounts_for(Unit
*u
) {
678 _cleanup_free_
char *path
= NULL
;
680 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
684 char s
[strlen(path
) + 1];
686 PATH_FOREACH_PREFIX_MORE(s
, path
) {
690 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
694 (void) set_remove(x
, u
);
696 if (set_isempty(x
)) {
697 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
705 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
708 static void unit_done(Unit
*u
) {
717 if (UNIT_VTABLE(u
)->done
)
718 UNIT_VTABLE(u
)->done(u
);
720 ec
= unit_get_exec_context(u
);
722 exec_context_done(ec
);
724 cc
= unit_get_cgroup_context(u
);
726 cgroup_context_done(cc
);
729 Unit
* unit_free(Unit
*u
) {
736 sd_event_source_disable_unref(u
->auto_start_stop_event_source
);
738 u
->transient_file
= safe_fclose(u
->transient_file
);
740 if (!MANAGER_IS_RELOADING(u
->manager
))
741 unit_remove_transient(u
);
743 bus_unit_send_removed_signal(u
);
747 unit_dequeue_rewatch_pids(u
);
749 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
750 u
->bus_track
= sd_bus_track_unref(u
->bus_track
);
751 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
752 u
->pending_freezer_invocation
= sd_bus_message_unref(u
->pending_freezer_invocation
);
754 unit_free_requires_mounts_for(u
);
756 SET_FOREACH(t
, u
->aliases
)
757 hashmap_remove_value(u
->manager
->units
, t
, u
);
759 hashmap_remove_value(u
->manager
->units
, u
->id
, u
);
761 if (!sd_id128_is_null(u
->invocation_id
))
762 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
776 /* A unit is being dropped from the tree, make sure our family is realized properly. Do this after we
777 * detach the unit from slice tree in order to eliminate its effect on controller masks. */
778 slice
= UNIT_GET_SLICE(u
);
779 unit_clear_dependencies(u
);
781 unit_add_family_to_cgroup_realize_queue(slice
);
784 manager_unref_console(u
->manager
);
786 fdset_free(u
->initial_socket_bind_link_fds
);
788 bpf_link_free(u
->ipv4_socket_bind_link
);
789 bpf_link_free(u
->ipv6_socket_bind_link
);
792 unit_release_cgroup(u
);
794 if (!MANAGER_IS_RELOADING(u
->manager
))
795 unit_unlink_state_files(u
);
797 unit_unref_uid_gid(u
, false);
799 (void) manager_update_failed_units(u
->manager
, u
, false);
800 set_remove(u
->manager
->startup_units
, u
);
802 unit_unwatch_all_pids(u
);
804 while (u
->refs_by_target
)
805 unit_ref_unset(u
->refs_by_target
);
807 if (u
->type
!= _UNIT_TYPE_INVALID
)
808 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
810 if (u
->in_load_queue
)
811 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
813 if (u
->in_dbus_queue
)
814 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
816 if (u
->in_cleanup_queue
)
817 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
820 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
822 if (u
->in_cgroup_realize_queue
)
823 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
825 if (u
->in_cgroup_empty_queue
)
826 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
828 if (u
->in_cgroup_oom_queue
)
829 LIST_REMOVE(cgroup_oom_queue
, u
->manager
->cgroup_oom_queue
, u
);
831 if (u
->in_target_deps_queue
)
832 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
834 if (u
->in_stop_when_unneeded_queue
)
835 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
837 if (u
->in_start_when_upheld_queue
)
838 LIST_REMOVE(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
840 if (u
->in_stop_when_bound_queue
)
841 LIST_REMOVE(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
843 if (u
->in_release_resources_queue
)
844 LIST_REMOVE(release_resources_queue
, u
->manager
->release_resources_queue
, u
);
846 bpf_firewall_close(u
);
848 hashmap_free(u
->bpf_foreign_by_key
);
850 bpf_program_free(u
->bpf_device_control_installed
);
853 bpf_link_free(u
->restrict_ifaces_ingress_bpf_link
);
854 bpf_link_free(u
->restrict_ifaces_egress_bpf_link
);
856 fdset_free(u
->initial_restric_ifaces_link_fds
);
858 condition_free_list(u
->conditions
);
859 condition_free_list(u
->asserts
);
861 free(u
->description
);
862 strv_free(u
->documentation
);
863 free(u
->fragment_path
);
864 free(u
->source_path
);
865 strv_free(u
->dropin_paths
);
868 free(u
->job_timeout_reboot_arg
);
871 free(u
->access_selinux_context
);
873 set_free_free(u
->aliases
);
876 activation_details_unref(u
->activation_details
);
881 FreezerState
unit_freezer_state(Unit
*u
) {
884 return u
->freezer_state
;
887 int unit_freezer_state_kernel(Unit
*u
, FreezerState
*ret
) {
888 char *values
[1] = {};
893 r
= cg_get_keyed_attribute(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events",
894 STRV_MAKE("frozen"), values
);
898 r
= _FREEZER_STATE_INVALID
;
901 if (streq(values
[0], "0"))
903 else if (streq(values
[0], "1"))
913 UnitActiveState
unit_active_state(Unit
*u
) {
916 if (u
->load_state
== UNIT_MERGED
)
917 return unit_active_state(unit_follow_merge(u
));
919 /* After a reload it might happen that a unit is not correctly
920 * loaded but still has a process around. That's why we won't
921 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
923 return UNIT_VTABLE(u
)->active_state(u
);
926 const char* unit_sub_state_to_string(Unit
*u
) {
929 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
932 static int unit_merge_names(Unit
*u
, Unit
*other
) {
939 r
= unit_add_alias(u
, other
->id
);
943 r
= set_move(u
->aliases
, other
->aliases
);
945 set_remove(u
->aliases
, other
->id
);
950 other
->aliases
= set_free_free(other
->aliases
);
952 SET_FOREACH(name
, u
->aliases
)
953 assert_se(hashmap_replace(u
->manager
->units
, name
, u
) == 0);
958 static int unit_reserve_dependencies(Unit
*u
, Unit
*other
) {
967 /* Let's reserve some space in the dependency hashmaps so that later on merging the units cannot
970 * First make some room in the per dependency type hashmaps. Using the summed size of both units'
971 * hashmaps is an estimate that is likely too high since they probably use some of the same
972 * types. But it's never too low, and that's all we need. */
974 n_reserve
= MIN(hashmap_size(other
->dependencies
), LESS_BY((size_t) _UNIT_DEPENDENCY_MAX
, hashmap_size(u
->dependencies
)));
976 r
= hashmap_ensure_allocated(&u
->dependencies
, NULL
);
980 r
= hashmap_reserve(u
->dependencies
, n_reserve
);
985 /* Now, enlarge our per dependency type hashmaps by the number of entries in the same hashmap of the
986 * other unit's dependencies.
988 * NB: If u does not have a dependency set allocated for some dependency type, there is no need to
989 * reserve anything for. In that case other's set will be transferred as a whole to u by
990 * complete_move(). */
992 HASHMAP_FOREACH_KEY(deps
, d
, u
->dependencies
) {
995 other_deps
= hashmap_get(other
->dependencies
, d
);
997 r
= hashmap_reserve(deps
, hashmap_size(other_deps
));
1005 static bool unit_should_warn_about_dependency(UnitDependency dependency
) {
1006 /* Only warn about some unit types */
1007 return IN_SET(dependency
,
1018 static int unit_per_dependency_type_hashmap_update(
1021 UnitDependencyMask origin_mask
,
1022 UnitDependencyMask destination_mask
) {
1024 UnitDependencyInfo info
;
1028 assert_cc(sizeof(void*) == sizeof(info
));
1030 /* Acquire the UnitDependencyInfo entry for the Unit* we are interested in, and update it if it
1031 * exists, or insert it anew if not. */
1033 info
.data
= hashmap_get(per_type
, other
);
1035 /* Entry already exists. Add in our mask. */
1037 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
1038 FLAGS_SET(destination_mask
, info
.destination_mask
))
1041 info
.origin_mask
|= origin_mask
;
1042 info
.destination_mask
|= destination_mask
;
1044 r
= hashmap_update(per_type
, other
, info
.data
);
1046 info
= (UnitDependencyInfo
) {
1047 .origin_mask
= origin_mask
,
1048 .destination_mask
= destination_mask
,
1051 r
= hashmap_put(per_type
, other
, info
.data
);
1060 static int unit_add_dependency_hashmap(
1061 Hashmap
**dependencies
,
1064 UnitDependencyMask origin_mask
,
1065 UnitDependencyMask destination_mask
) {
1070 assert(dependencies
);
1072 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
1073 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
1074 assert(origin_mask
> 0 || destination_mask
> 0);
1076 /* Ensure the top-level dependency hashmap exists that maps UnitDependency → Hashmap(Unit* →
1077 * UnitDependencyInfo) */
1078 r
= hashmap_ensure_allocated(dependencies
, NULL
);
1082 /* Acquire the inner hashmap, that maps Unit* → UnitDependencyInfo, for the specified dependency
1083 * type, and if it's missing allocate it and insert it. */
1084 per_type
= hashmap_get(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
));
1086 per_type
= hashmap_new(NULL
);
1090 r
= hashmap_put(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
), per_type
);
1092 hashmap_free(per_type
);
1097 return unit_per_dependency_type_hashmap_update(per_type
, other
, origin_mask
, destination_mask
);
1100 static void unit_merge_dependencies(Unit
*u
, Unit
*other
) {
1102 void *dt
; /* Actually of type UnitDependency, except that we don't bother casting it here,
1103 * since the hashmaps all want it as void pointer. */
1111 /* First, remove dependency to other. */
1112 HASHMAP_FOREACH_KEY(deps
, dt
, u
->dependencies
) {
1113 if (hashmap_remove(deps
, other
) && unit_should_warn_about_dependency(UNIT_DEPENDENCY_FROM_PTR(dt
)))
1114 log_unit_warning(u
, "Dependency %s=%s is dropped, as %s is merged into %s.",
1115 unit_dependency_to_string(UNIT_DEPENDENCY_FROM_PTR(dt
)),
1116 other
->id
, other
->id
, u
->id
);
1118 if (hashmap_isempty(deps
))
1119 hashmap_free(hashmap_remove(u
->dependencies
, dt
));
1123 _cleanup_(hashmap_freep
) Hashmap
*other_deps
= NULL
;
1124 UnitDependencyInfo di_back
;
1127 /* Let's focus on one dependency type at a time, that 'other' has defined. */
1128 other_deps
= hashmap_steal_first_key_and_value(other
->dependencies
, &dt
);
1132 deps
= hashmap_get(u
->dependencies
, dt
);
1134 /* Now iterate through all dependencies of this dependency type, of 'other'. We refer to the
1135 * referenced units as 'back'. */
1136 HASHMAP_FOREACH_KEY(di_back
.data
, back
, other_deps
) {
1141 /* This is a dependency pointing back to the unit we want to merge with?
1142 * Suppress it (but warn) */
1143 if (unit_should_warn_about_dependency(UNIT_DEPENDENCY_FROM_PTR(dt
)))
1144 log_unit_warning(u
, "Dependency %s=%s in %s is dropped, as %s is merged into %s.",
1145 unit_dependency_to_string(UNIT_DEPENDENCY_FROM_PTR(dt
)),
1146 u
->id
, other
->id
, other
->id
, u
->id
);
1148 hashmap_remove(other_deps
, back
);
1152 /* Now iterate through all deps of 'back', and fix the ones pointing to 'other' to
1153 * point to 'u' instead. */
1154 HASHMAP_FOREACH_KEY(back_deps
, back_dt
, back
->dependencies
) {
1155 UnitDependencyInfo di_move
;
1157 di_move
.data
= hashmap_remove(back_deps
, other
);
1161 assert_se(unit_per_dependency_type_hashmap_update(
1164 di_move
.origin_mask
,
1165 di_move
.destination_mask
) >= 0);
1168 /* The target unit already has dependencies of this type, let's then merge this individually. */
1170 assert_se(unit_per_dependency_type_hashmap_update(
1173 di_back
.origin_mask
,
1174 di_back
.destination_mask
) >= 0);
1177 /* Now all references towards 'other' of the current type 'dt' are corrected to point to 'u'.
1178 * Lets's now move the deps of type 'dt' from 'other' to 'u'. If the unit does not have
1179 * dependencies of this type, let's move them per type wholesale. */
1181 assert_se(hashmap_put(u
->dependencies
, dt
, TAKE_PTR(other_deps
)) >= 0);
1184 other
->dependencies
= hashmap_free(other
->dependencies
);
1187 int unit_merge(Unit
*u
, Unit
*other
) {
1192 assert(u
->manager
== other
->manager
);
1193 assert(u
->type
!= _UNIT_TYPE_INVALID
);
1195 other
= unit_follow_merge(other
);
1200 if (u
->type
!= other
->type
)
1203 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
1206 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
1209 if (!streq_ptr(u
->instance
, other
->instance
))
1218 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1221 /* Make reservations to ensure merge_dependencies() won't fail. We don't rollback reservations if we
1222 * fail. We don't have a way to undo reservations. A reservation is not a leak. */
1223 r
= unit_reserve_dependencies(u
, other
);
1227 /* Redirect all references */
1228 while (other
->refs_by_target
)
1229 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
1231 /* Merge dependencies */
1232 unit_merge_dependencies(u
, other
);
1234 /* Merge names. It is better to do that after merging deps, otherwise the log message contains n/a. */
1235 r
= unit_merge_names(u
, other
);
1239 other
->load_state
= UNIT_MERGED
;
1240 other
->merged_into
= u
;
1242 if (!u
->activation_details
)
1243 u
->activation_details
= activation_details_ref(other
->activation_details
);
1245 /* If there is still some data attached to the other node, we
1246 * don't need it anymore, and can free it. */
1247 if (other
->load_state
!= UNIT_STUB
)
1248 if (UNIT_VTABLE(other
)->done
)
1249 UNIT_VTABLE(other
)->done(other
);
1251 unit_add_to_dbus_queue(u
);
1252 unit_add_to_cleanup_queue(other
);
1257 int unit_merge_by_name(Unit
*u
, const char *name
) {
1258 _cleanup_free_
char *s
= NULL
;
1262 /* Either add name to u, or if a unit with name already exists, merge it with u.
1263 * If name is a template, do the same for name@instance, where instance is u's instance. */
1268 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
1272 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
1279 other
= manager_get_unit(u
->manager
, name
);
1281 return unit_merge(u
, other
);
1283 return unit_add_name(u
, name
);
1286 Unit
* unit_follow_merge(Unit
*u
) {
1289 while (u
->load_state
== UNIT_MERGED
)
1290 assert_se(u
= u
->merged_into
);
1295 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
1301 /* Unlike unit_add_dependency() or friends, this always returns 0 on success. */
1303 if (c
->working_directory
&& !c
->working_directory_missing_ok
) {
1304 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
1309 if (c
->root_directory
) {
1310 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
1315 if (c
->root_image
) {
1316 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
1321 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
1322 if (!u
->manager
->prefix
[dt
])
1325 for (size_t i
= 0; i
< c
->directories
[dt
].n_items
; i
++) {
1326 _cleanup_free_
char *p
= NULL
;
1328 p
= path_join(u
->manager
->prefix
[dt
], c
->directories
[dt
].items
[i
].path
);
1332 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1338 if (!MANAGER_IS_SYSTEM(u
->manager
))
1341 /* For the following three directory types we need write access, and /var/ is possibly on the root
1342 * fs. Hence order after systemd-remount-fs.service, to ensure things are writable. */
1343 if (c
->directories
[EXEC_DIRECTORY_STATE
].n_items
> 0 ||
1344 c
->directories
[EXEC_DIRECTORY_CACHE
].n_items
> 0 ||
1345 c
->directories
[EXEC_DIRECTORY_LOGS
].n_items
> 0) {
1346 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_REMOUNT_FS_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1351 if (c
->private_tmp
) {
1353 /* FIXME: for now we make a special case for /tmp and add a weak dependency on
1354 * tmp.mount so /tmp being masked is supported. However there's no reason to treat
1355 * /tmp specifically and masking other mount units should be handled more
1356 * gracefully too, see PR#16894. */
1357 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "tmp.mount", true, UNIT_DEPENDENCY_FILE
);
1361 r
= unit_require_mounts_for(u
, "/var/tmp", UNIT_DEPENDENCY_FILE
);
1365 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1370 if (c
->root_image
) {
1371 /* We need to wait for /dev/loopX to appear when doing RootImage=, hence let's add an
1372 * implicit dependency on udev */
1374 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_UDEVD_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1379 if (!IN_SET(c
->std_output
,
1380 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1381 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1382 !IN_SET(c
->std_error
,
1383 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1384 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1388 /* If syslog or kernel logging is requested (or log namespacing is), make sure our own logging daemon
1391 if (c
->log_namespace
) {
1392 _cleanup_free_
char *socket_unit
= NULL
, *varlink_socket_unit
= NULL
;
1394 r
= unit_name_build_from_type("systemd-journald", c
->log_namespace
, UNIT_SOCKET
, &socket_unit
);
1398 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1402 r
= unit_name_build_from_type("systemd-journald-varlink", c
->log_namespace
, UNIT_SOCKET
, &varlink_socket_unit
);
1406 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, varlink_socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1410 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1414 if (exec_context_has_credentials(c
) && u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]) {
1415 _cleanup_free_
char *p
= NULL
, *m
= NULL
;
1417 /* Let's make sure the credentials directory of this service is unmounted *after* the service
1418 * itself shuts down. This only matters if mount namespacing is not used for the service, and
1419 * hence the credentials mount appears on the host. */
1421 p
= path_join(u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], "credentials", u
->id
);
1425 r
= unit_name_from_path(p
, ".mount", &m
);
1429 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, m
, /* add_reference= */ true, UNIT_DEPENDENCY_FILE
);
1437 const char* unit_description(Unit
*u
) {
1441 return u
->description
;
1443 return strna(u
->id
);
1446 const char* unit_status_string(Unit
*u
, char **ret_combined_buffer
) {
1450 /* Return u->id, u->description, or "{u->id} - {u->description}".
1451 * Versions with u->description are only used if it is set.
1452 * The last option is used if configured and the caller provided the 'ret_combined_buffer'
1455 * Note that *ret_combined_buffer may be set to NULL. */
1457 if (!u
->description
||
1458 u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
||
1459 (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& !ret_combined_buffer
) ||
1460 streq(u
->description
, u
->id
)) {
1462 if (ret_combined_buffer
)
1463 *ret_combined_buffer
= NULL
;
1467 if (ret_combined_buffer
) {
1468 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
) {
1469 *ret_combined_buffer
= strjoin(u
->id
, " - ", u
->description
);
1470 if (*ret_combined_buffer
)
1471 return *ret_combined_buffer
;
1472 log_oom(); /* Fall back to ->description */
1474 *ret_combined_buffer
= NULL
;
1477 return u
->description
;
1480 /* Common implementation for multiple backends */
1481 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1486 /* Load a .{service,socket,...} file */
1487 r
= unit_load_fragment(u
);
1491 if (u
->load_state
== UNIT_STUB
) {
1492 if (fragment_required
)
1495 u
->load_state
= UNIT_LOADED
;
1498 /* Load drop-in directory data. If u is an alias, we might be reloading the
1499 * target unit needlessly. But we cannot be sure which drops-ins have already
1500 * been loaded and which not, at least without doing complicated book-keeping,
1501 * so let's always reread all drop-ins. */
1502 r
= unit_load_dropin(unit_follow_merge(u
));
1506 if (u
->source_path
) {
1509 if (stat(u
->source_path
, &st
) >= 0)
1510 u
->source_mtime
= timespec_load(&st
.st_mtim
);
1512 u
->source_mtime
= 0;
1518 void unit_add_to_target_deps_queue(Unit
*u
) {
1519 Manager
*m
= ASSERT_PTR(ASSERT_PTR(u
)->manager
);
1521 if (u
->in_target_deps_queue
)
1524 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1525 u
->in_target_deps_queue
= true;
1528 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1532 if (target
->type
!= UNIT_TARGET
)
1535 /* Only add the dependency if both units are loaded, so that
1536 * that loop check below is reliable */
1537 if (u
->load_state
!= UNIT_LOADED
||
1538 target
->load_state
!= UNIT_LOADED
)
1541 /* If either side wants no automatic dependencies, then let's
1543 if (!u
->default_dependencies
||
1544 !target
->default_dependencies
)
1547 /* Don't create loops */
1548 if (unit_has_dependency(target
, UNIT_ATOM_BEFORE
, u
))
1551 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1554 static int unit_add_slice_dependencies(Unit
*u
) {
1558 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1561 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1562 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1564 UnitDependencyMask mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1566 slice
= UNIT_GET_SLICE(u
);
1568 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, slice
, true, mask
);
1570 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1573 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1576 static int unit_add_mount_dependencies(Unit
*u
) {
1577 UnitDependencyInfo di
;
1579 bool changed
= false;
1584 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
) {
1585 char prefix
[strlen(path
) + 1];
1587 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1588 _cleanup_free_
char *p
= NULL
;
1591 r
= unit_name_from_path(prefix
, ".mount", &p
);
1593 continue; /* If the path cannot be converted to a mount unit name, then it's
1594 * not manageable as a unit by systemd, and hence we don't need a
1595 * dependency on it. Let's thus silently ignore the issue. */
1599 m
= manager_get_unit(u
->manager
, p
);
1601 /* Make sure to load the mount unit if it exists. If so the dependencies on
1602 * this unit will be added later during the loading of the mount unit. */
1603 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1609 if (m
->load_state
!= UNIT_LOADED
)
1612 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1615 changed
= changed
|| r
> 0;
1617 if (m
->fragment_path
) {
1618 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1621 changed
= changed
|| r
> 0;
1629 static int unit_add_oomd_dependencies(Unit
*u
) {
1636 if (!u
->default_dependencies
)
1639 c
= unit_get_cgroup_context(u
);
1643 bool wants_oomd
= c
->moom_swap
== MANAGED_OOM_KILL
|| c
->moom_mem_pressure
== MANAGED_OOM_KILL
;
1647 if (!cg_all_unified())
1650 r
= cg_mask_supported(&mask
);
1652 return log_debug_errno(r
, "Failed to determine supported controllers: %m");
1654 if (!FLAGS_SET(mask
, CGROUP_MASK_MEMORY
))
1657 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "systemd-oomd.service", true, UNIT_DEPENDENCY_FILE
);
1660 static int unit_add_startup_units(Unit
*u
) {
1661 if (!unit_has_startup_cgroup_constraints(u
))
1664 return set_ensure_put(&u
->manager
->startup_units
, NULL
, u
);
1667 static int unit_validate_on_failure_job_mode(
1669 const char *job_mode_setting
,
1671 const char *dependency_name
,
1672 UnitDependencyAtom atom
) {
1674 Unit
*other
, *found
= NULL
;
1676 if (job_mode
!= JOB_ISOLATE
)
1679 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
1682 else if (found
!= other
)
1683 return log_unit_error_errno(
1684 u
, SYNTHETIC_ERRNO(ENOEXEC
),
1685 "More than one %s dependencies specified but %sisolate set. Refusing.",
1686 dependency_name
, job_mode_setting
);
1692 int unit_load(Unit
*u
) {
1697 if (u
->in_load_queue
) {
1698 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1699 u
->in_load_queue
= false;
1702 if (u
->type
== _UNIT_TYPE_INVALID
)
1705 if (u
->load_state
!= UNIT_STUB
)
1708 if (u
->transient_file
) {
1709 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1710 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1712 r
= fflush_and_check(u
->transient_file
);
1716 u
->transient_file
= safe_fclose(u
->transient_file
);
1717 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1720 r
= UNIT_VTABLE(u
)->load(u
);
1724 assert(u
->load_state
!= UNIT_STUB
);
1726 if (u
->load_state
== UNIT_LOADED
) {
1727 unit_add_to_target_deps_queue(u
);
1729 r
= unit_add_slice_dependencies(u
);
1733 r
= unit_add_mount_dependencies(u
);
1737 r
= unit_add_oomd_dependencies(u
);
1741 r
= unit_add_startup_units(u
);
1745 r
= unit_validate_on_failure_job_mode(u
, "OnSuccessJobMode=", u
->on_success_job_mode
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
);
1749 r
= unit_validate_on_failure_job_mode(u
, "OnFailureJobMode=", u
->on_failure_job_mode
, "OnFailure=", UNIT_ATOM_ON_FAILURE
);
1753 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1754 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1756 /* We finished loading, let's ensure our parents recalculate the members mask */
1757 unit_invalidate_cgroup_members_masks(u
);
1760 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1762 unit_add_to_dbus_queue(unit_follow_merge(u
));
1763 unit_add_to_gc_queue(u
);
1764 (void) manager_varlink_send_managed_oom_update(u
);
1769 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code
1770 * should hence return ENOEXEC to ensure units are placed in this state after loading. */
1772 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1773 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1777 /* Record the timestamp on the cache, so that if the cache gets updated between now and the next time
1778 * an attempt is made to load this unit, we know we need to check again. */
1779 if (u
->load_state
== UNIT_NOT_FOUND
)
1780 u
->fragment_not_found_timestamp_hash
= u
->manager
->unit_cache_timestamp_hash
;
1782 unit_add_to_dbus_queue(u
);
1783 unit_add_to_gc_queue(u
);
1785 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1789 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1794 if (u
&& !unit_log_level_test(u
, level
))
1795 return -ERRNO_VALUE(error
);
1797 va_start(ap
, format
);
1799 r
= log_object_internalv(level
, error
, file
, line
, func
,
1800 u
->manager
->unit_log_field
,
1802 u
->manager
->invocation_log_field
,
1803 u
->invocation_id_string
,
1806 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1812 static bool unit_test_condition(Unit
*u
) {
1813 _cleanup_strv_free_
char **env
= NULL
;
1818 dual_timestamp_get(&u
->condition_timestamp
);
1820 r
= manager_get_effective_environment(u
->manager
, &env
);
1822 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1823 u
->condition_result
= true;
1825 u
->condition_result
= condition_test_list(
1828 condition_type_to_string
,
1832 unit_add_to_dbus_queue(u
);
1833 return u
->condition_result
;
1836 static bool unit_test_assert(Unit
*u
) {
1837 _cleanup_strv_free_
char **env
= NULL
;
1842 dual_timestamp_get(&u
->assert_timestamp
);
1844 r
= manager_get_effective_environment(u
->manager
, &env
);
1846 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1847 u
->assert_result
= CONDITION_ERROR
;
1849 u
->assert_result
= condition_test_list(
1852 assert_type_to_string
,
1856 unit_add_to_dbus_queue(u
);
1857 return u
->assert_result
;
1860 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *format
, const char *ident
) {
1861 if (log_get_show_color()) {
1862 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& strchr(ident
, ' '))
1863 ident
= strjoina(ANSI_HIGHLIGHT
, u
->id
, ANSI_NORMAL
, " - ", u
->description
);
1865 ident
= strjoina(ANSI_HIGHLIGHT
, ident
, ANSI_NORMAL
);
1868 DISABLE_WARNING_FORMAT_NONLITERAL
;
1869 manager_status_printf(u
->manager
, status_type
, status
, format
, ident
);
1873 int unit_test_start_limit(Unit
*u
) {
1878 if (ratelimit_below(&u
->start_ratelimit
)) {
1879 u
->start_limit_hit
= false;
1883 log_unit_warning(u
, "Start request repeated too quickly.");
1884 u
->start_limit_hit
= true;
1886 reason
= strjoina("unit ", u
->id
, " failed");
1888 emergency_action(u
->manager
, u
->start_limit_action
,
1889 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1890 u
->reboot_arg
, -1, reason
);
1895 bool unit_shall_confirm_spawn(Unit
*u
) {
1898 if (manager_is_confirm_spawn_disabled(u
->manager
))
1901 /* For some reasons units remaining in the same process group
1902 * as PID 1 fail to acquire the console even if it's not used
1903 * by any process. So skip the confirmation question for them. */
1904 return !unit_get_exec_context(u
)->same_pgrp
;
1907 static bool unit_verify_deps(Unit
*u
) {
1912 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined
1913 * with After=. We do not check Requires= or Requisite= here as they only should have an effect on
1914 * the job processing, but do not have any effect afterwards. We don't check BindsTo= dependencies
1915 * that are not used in conjunction with After= as for them any such check would make things entirely
1918 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
1920 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
))
1923 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1924 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1932 /* Errors that aren't really errors:
1933 * -EALREADY: Unit is already started.
1934 * -ECOMM: Condition failed
1935 * -EAGAIN: An operation is already in progress. Retry later.
1937 * Errors that are real errors:
1938 * -EBADR: This unit type does not support starting.
1939 * -ECANCELED: Start limit hit, too many requests for now
1940 * -EPROTO: Assert failed
1941 * -EINVAL: Unit not loaded
1942 * -EOPNOTSUPP: Unit type not supported
1943 * -ENOLINK: The necessary dependencies are not fulfilled.
1944 * -ESTALE: This unit has been started before and can't be started a second time
1945 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1947 int unit_start(Unit
*u
, ActivationDetails
*details
) {
1948 UnitActiveState state
;
1954 /* Let's hold off running start jobs for mount units when /proc/self/mountinfo monitor is rate limited. */
1955 if (u
->type
== UNIT_MOUNT
&& sd_event_source_is_ratelimited(u
->manager
->mount_event_source
))
1958 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1959 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1960 * waiting is finished. */
1961 state
= unit_active_state(u
);
1962 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1964 if (state
== UNIT_MAINTENANCE
)
1967 /* Units that aren't loaded cannot be started */
1968 if (u
->load_state
!= UNIT_LOADED
)
1971 /* Refuse starting scope units more than once */
1972 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1975 /* If the conditions were unmet, don't do anything at all. If we already are activating this call might
1976 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1977 * recheck the condition in that case. */
1978 if (state
!= UNIT_ACTIVATING
&&
1979 !unit_test_condition(u
))
1980 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition not met. Not starting unit.");
1982 /* If the asserts failed, fail the entire job */
1983 if (state
!= UNIT_ACTIVATING
&&
1984 !unit_test_assert(u
))
1985 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1987 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1988 * condition checks, so that we rather return condition check errors (which are usually not
1989 * considered a true failure) than "not supported" errors (which are considered a failure).
1991 if (!unit_type_supported(u
->type
))
1994 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1995 * should have taken care of this already, but let's check this here again. After all, our
1996 * dependencies might not be in effect anymore, due to a reload or due to an unmet condition. */
1997 if (!unit_verify_deps(u
))
2000 /* Forward to the main object, if we aren't it. */
2001 following
= unit_following(u
);
2003 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
2004 return unit_start(following
, details
);
2007 /* Check our ability to start early so that failure conditions don't cause us to enter a busy loop. */
2008 if (UNIT_VTABLE(u
)->can_start
) {
2009 r
= UNIT_VTABLE(u
)->can_start(u
);
2014 /* If it is stopped, but we cannot start it, then fail */
2015 if (!UNIT_VTABLE(u
)->start
)
2018 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
2019 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
2020 * waits for a holdoff timer to elapse before it will start again. */
2022 unit_add_to_dbus_queue(u
);
2023 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2025 if (!u
->activation_details
) /* Older details object wins */
2026 u
->activation_details
= activation_details_ref(details
);
2028 return UNIT_VTABLE(u
)->start(u
);
2031 bool unit_can_start(Unit
*u
) {
2034 if (u
->load_state
!= UNIT_LOADED
)
2037 if (!unit_type_supported(u
->type
))
2040 /* Scope units may be started only once */
2041 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
2044 return !!UNIT_VTABLE(u
)->start
;
2047 bool unit_can_isolate(Unit
*u
) {
2050 return unit_can_start(u
) &&
2055 * -EBADR: This unit type does not support stopping.
2056 * -EALREADY: Unit is already stopped.
2057 * -EAGAIN: An operation is already in progress. Retry later.
2059 int unit_stop(Unit
*u
) {
2060 UnitActiveState state
;
2065 state
= unit_active_state(u
);
2066 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
2069 following
= unit_following(u
);
2071 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
2072 return unit_stop(following
);
2075 if (!UNIT_VTABLE(u
)->stop
)
2078 unit_add_to_dbus_queue(u
);
2079 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2081 return UNIT_VTABLE(u
)->stop(u
);
2084 bool unit_can_stop(Unit
*u
) {
2087 /* Note: if we return true here, it does not mean that the unit may be successfully stopped.
2088 * Extrinsic units follow external state and they may stop following external state changes
2089 * (hence we return true here), but an attempt to do this through the manager will fail. */
2091 if (!unit_type_supported(u
->type
))
2097 return !!UNIT_VTABLE(u
)->stop
;
2101 * -EBADR: This unit type does not support reloading.
2102 * -ENOEXEC: Unit is not started.
2103 * -EAGAIN: An operation is already in progress. Retry later.
2105 int unit_reload(Unit
*u
) {
2106 UnitActiveState state
;
2111 if (u
->load_state
!= UNIT_LOADED
)
2114 if (!unit_can_reload(u
))
2117 state
= unit_active_state(u
);
2118 if (state
== UNIT_RELOADING
)
2121 if (state
!= UNIT_ACTIVE
)
2122 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
), "Unit cannot be reloaded because it is inactive.");
2124 following
= unit_following(u
);
2126 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
2127 return unit_reload(following
);
2130 unit_add_to_dbus_queue(u
);
2132 if (!UNIT_VTABLE(u
)->reload
) {
2133 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
2134 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), /* reload_success = */ true);
2138 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2140 return UNIT_VTABLE(u
)->reload(u
);
2143 bool unit_can_reload(Unit
*u
) {
2146 if (UNIT_VTABLE(u
)->can_reload
)
2147 return UNIT_VTABLE(u
)->can_reload(u
);
2149 if (unit_has_dependency(u
, UNIT_ATOM_PROPAGATES_RELOAD_TO
, NULL
))
2152 return UNIT_VTABLE(u
)->reload
;
2155 bool unit_is_unneeded(Unit
*u
) {
2159 if (!u
->stop_when_unneeded
)
2162 /* Don't clean up while the unit is transitioning or is even inactive. */
2163 if (unit_active_state(u
) != UNIT_ACTIVE
)
2168 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_PINS_STOP_WHEN_UNNEEDED
) {
2169 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
2170 * restart, then don't clean this one up. */
2175 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2178 if (unit_will_restart(other
))
2185 bool unit_is_upheld_by_active(Unit
*u
, Unit
**ret_culprit
) {
2190 /* Checks if the unit needs to be started because it currently is not running, but some other unit
2191 * that is active declared an Uphold= dependencies on it */
2193 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)) || u
->job
) {
2195 *ret_culprit
= NULL
;
2199 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_START_STEADILY
) {
2203 if (UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
2205 *ret_culprit
= other
;
2211 *ret_culprit
= NULL
;
2215 bool unit_is_bound_by_inactive(Unit
*u
, Unit
**ret_culprit
) {
2220 /* Checks whether this unit is bound to another unit that is inactive, i.e. whether we should stop
2221 * because the other unit is down. */
2223 if (unit_active_state(u
) != UNIT_ACTIVE
|| u
->job
) {
2224 /* Don't clean up while the unit is transitioning or is even inactive. */
2226 *ret_culprit
= NULL
;
2230 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
2234 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
))) {
2236 *ret_culprit
= other
;
2243 *ret_culprit
= NULL
;
2247 static void check_unneeded_dependencies(Unit
*u
) {
2251 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2253 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_STOP_WHEN_UNNEEDED_QUEUE
)
2254 unit_submit_to_stop_when_unneeded_queue(other
);
2257 static void check_uphold_dependencies(Unit
*u
) {
2261 /* Add all units this unit depends on to the queue that processes Uphold= behaviour. */
2263 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_START_WHEN_UPHELD_QUEUE
)
2264 unit_submit_to_start_when_upheld_queue(other
);
2267 static void check_bound_by_dependencies(Unit
*u
) {
2271 /* Add all units this unit depends on to the queue that processes BindsTo= stop behaviour. */
2273 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_CANNOT_BE_ACTIVE_WITHOUT_QUEUE
)
2274 unit_submit_to_stop_when_bound_queue(other
);
2277 static void retroactively_start_dependencies(Unit
*u
) {
2281 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2283 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_REPLACE
) /* Requires= + BindsTo= */
2284 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2285 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2286 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2288 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_FAIL
) /* Wants= */
2289 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2290 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2291 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2293 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_START
) /* Conflicts= (and inverse) */
2294 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2295 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2298 static void retroactively_stop_dependencies(Unit
*u
) {
2302 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2304 /* Pull down units which are bound to us recursively if enabled */
2305 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_STOP
) /* BoundBy= */
2306 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2307 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2310 void unit_start_on_failure(
2312 const char *dependency_name
,
2313 UnitDependencyAtom atom
,
2321 assert(dependency_name
);
2322 assert(IN_SET(atom
, UNIT_ATOM_ON_SUCCESS
, UNIT_ATOM_ON_FAILURE
));
2324 /* Act on OnFailure= and OnSuccess= dependencies */
2326 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
2327 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2330 log_unit_info(u
, "Triggering %s dependencies.", dependency_name
);
2334 r
= manager_add_job(u
->manager
, JOB_START
, other
, job_mode
, NULL
, &error
, NULL
);
2336 log_unit_warning_errno(
2337 u
, r
, "Failed to enqueue %s job, ignoring: %s",
2338 dependency_name
, bus_error_message(&error
, r
));
2343 log_unit_debug(u
, "Triggering %s dependencies done (%i %s).",
2344 dependency_name
, n_jobs
, n_jobs
== 1 ? "job" : "jobs");
2347 void unit_trigger_notify(Unit
*u
) {
2352 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_TRIGGERED_BY
)
2353 if (UNIT_VTABLE(other
)->trigger_notify
)
2354 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2357 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2358 if (condition_notice
&& log_level
> LOG_NOTICE
)
2360 if (condition_info
&& log_level
> LOG_INFO
)
2365 static int unit_log_resources(Unit
*u
) {
2366 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4];
2367 bool any_traffic
= false, have_ip_accounting
= false, any_io
= false, have_io_accounting
= false;
2368 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
, *rr
= NULL
, *wr
= NULL
;
2369 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a threshold */
2370 size_t n_message_parts
= 0, n_iovec
= 0;
2371 char* message_parts
[1 + 2 + 2 + 1], *t
;
2372 nsec_t nsec
= NSEC_INFINITY
;
2374 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2375 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2376 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2377 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2378 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2380 const char* const io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2381 [CGROUP_IO_READ_BYTES
] = "IO_METRIC_READ_BYTES",
2382 [CGROUP_IO_WRITE_BYTES
] = "IO_METRIC_WRITE_BYTES",
2383 [CGROUP_IO_READ_OPERATIONS
] = "IO_METRIC_READ_OPERATIONS",
2384 [CGROUP_IO_WRITE_OPERATIONS
] = "IO_METRIC_WRITE_OPERATIONS",
2389 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2390 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2391 * information and the complete data in structured fields. */
2393 (void) unit_get_cpu_usage(u
, &nsec
);
2394 if (nsec
!= NSEC_INFINITY
) {
2395 /* Format the CPU time for inclusion in the structured log message */
2396 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2400 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2402 /* Format the CPU time for inclusion in the human language message string */
2403 t
= strjoin("consumed ", FORMAT_TIMESPAN(nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
), " CPU time");
2409 message_parts
[n_message_parts
++] = t
;
2411 log_level
= raise_level(log_level
,
2412 nsec
> MENTIONWORTHY_CPU_NSEC
,
2413 nsec
> NOTICEWORTHY_CPU_NSEC
);
2416 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2417 uint64_t value
= UINT64_MAX
;
2419 assert(io_fields
[k
]);
2421 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2422 if (value
== UINT64_MAX
)
2425 have_io_accounting
= true;
2429 /* Format IO accounting data for inclusion in the structured log message */
2430 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2434 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2436 /* Format the IO accounting data for inclusion in the human language message string, but only
2437 * for the bytes counters (and not for the operations counters) */
2438 if (k
== CGROUP_IO_READ_BYTES
) {
2440 rr
= strjoin("read ", strna(FORMAT_BYTES(value
)), " from disk");
2445 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2447 wr
= strjoin("written ", strna(FORMAT_BYTES(value
)), " to disk");
2454 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2455 log_level
= raise_level(log_level
,
2456 value
> MENTIONWORTHY_IO_BYTES
,
2457 value
> NOTICEWORTHY_IO_BYTES
);
2460 if (have_io_accounting
) {
2463 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2465 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2470 k
= strdup("no IO");
2476 message_parts
[n_message_parts
++] = k
;
2480 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2481 uint64_t value
= UINT64_MAX
;
2483 assert(ip_fields
[m
]);
2485 (void) unit_get_ip_accounting(u
, m
, &value
);
2486 if (value
== UINT64_MAX
)
2489 have_ip_accounting
= true;
2493 /* Format IP accounting data for inclusion in the structured log message */
2494 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2498 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2500 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2501 * bytes counters (and not for the packets counters) */
2502 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2504 igress
= strjoin("received ", strna(FORMAT_BYTES(value
)), " IP traffic");
2509 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2511 egress
= strjoin("sent ", strna(FORMAT_BYTES(value
)), " IP traffic");
2518 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2519 log_level
= raise_level(log_level
,
2520 value
> MENTIONWORTHY_IP_BYTES
,
2521 value
> NOTICEWORTHY_IP_BYTES
);
2524 /* This check is here because it is the earliest point following all possible log_level assignments. If
2525 * log_level is assigned anywhere after this point, move this check. */
2526 if (!unit_log_level_test(u
, log_level
)) {
2531 if (have_ip_accounting
) {
2534 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2536 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2541 k
= strdup("no IP traffic");
2547 message_parts
[n_message_parts
++] = k
;
2551 /* Is there any accounting data available at all? */
2557 if (n_message_parts
== 0)
2558 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2560 _cleanup_free_
char *joined
= NULL
;
2562 message_parts
[n_message_parts
] = NULL
;
2564 joined
= strv_join(message_parts
, ", ");
2570 joined
[0] = ascii_toupper(joined
[0]);
2571 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2574 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2575 * and hence don't increase n_iovec for them */
2576 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2577 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2579 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2580 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2582 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2583 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2585 log_unit_struct_iovec(u
, log_level
, iovec
, n_iovec
+ 4);
2589 for (size_t i
= 0; i
< n_message_parts
; i
++)
2590 free(message_parts
[i
]);
2592 for (size_t i
= 0; i
< n_iovec
; i
++)
2593 free(iovec
[i
].iov_base
);
2599 static void unit_update_on_console(Unit
*u
) {
2604 b
= unit_needs_console(u
);
2605 if (u
->on_console
== b
)
2610 manager_ref_console(u
->manager
);
2612 manager_unref_console(u
->manager
);
2615 static void unit_emit_audit_start(Unit
*u
) {
2618 if (u
->type
!= UNIT_SERVICE
)
2621 /* Write audit record if we have just finished starting up */
2622 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2626 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2629 if (u
->type
!= UNIT_SERVICE
)
2633 /* Write audit record if we have just finished shutting down */
2634 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2635 u
->in_audit
= false;
2637 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2638 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2640 if (state
== UNIT_INACTIVE
)
2641 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2645 static bool unit_process_job(Job
*j
, UnitActiveState ns
, bool reload_success
) {
2646 bool unexpected
= false;
2651 if (j
->state
== JOB_WAITING
)
2652 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2654 job_add_to_run_queue(j
);
2656 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2657 * hence needs to invalidate jobs. */
2662 case JOB_VERIFY_ACTIVE
:
2664 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2665 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2666 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2669 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2670 if (ns
== UNIT_FAILED
)
2671 result
= JOB_FAILED
;
2675 job_finish_and_invalidate(j
, result
, true, false);
2682 case JOB_RELOAD_OR_START
:
2683 case JOB_TRY_RELOAD
:
2685 if (j
->state
== JOB_RUNNING
) {
2686 if (ns
== UNIT_ACTIVE
)
2687 job_finish_and_invalidate(j
, reload_success
? JOB_DONE
: JOB_FAILED
, true, false);
2688 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2691 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2692 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2700 case JOB_TRY_RESTART
:
2702 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2703 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2704 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2706 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2712 assert_not_reached();
2718 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, bool reload_success
) {
2723 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2724 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2726 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2727 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2728 * remounted this function will be called too! */
2732 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2733 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2734 unit_add_to_dbus_queue(u
);
2736 /* Update systemd-oomd on the property/state change */
2738 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2740 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2741 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2742 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2743 * have the information on the property. Thus, indiscriminately send an update. */
2744 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2745 (void) manager_varlink_send_managed_oom_update(u
);
2748 /* Update timestamps for state changes */
2749 if (!MANAGER_IS_RELOADING(m
)) {
2750 dual_timestamp_get(&u
->state_change_timestamp
);
2752 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2753 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2754 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2755 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2757 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2758 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2759 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2760 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2763 /* Keep track of failed units */
2764 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2766 /* Make sure the cgroup and state files are always removed when we become inactive */
2767 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2768 SET_FLAG(u
->markers
,
2769 (1u << UNIT_MARKER_NEEDS_RELOAD
)|(1u << UNIT_MARKER_NEEDS_RESTART
),
2771 unit_prune_cgroup(u
);
2772 unit_unlink_state_files(u
);
2773 } else if (ns
!= os
&& ns
== UNIT_RELOADING
)
2774 SET_FLAG(u
->markers
, 1u << UNIT_MARKER_NEEDS_RELOAD
, false);
2776 unit_update_on_console(u
);
2778 if (!MANAGER_IS_RELOADING(m
)) {
2781 /* Let's propagate state changes to the job */
2783 unexpected
= unit_process_job(u
->job
, ns
, reload_success
);
2787 /* If this state change happened without being requested by a job, then let's retroactively start or
2788 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2789 * additional jobs just because something is already activated. */
2792 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2793 retroactively_start_dependencies(u
);
2794 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2795 retroactively_stop_dependencies(u
);
2798 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2799 log_unit_debug(u
, "Unit entered failed state.");
2800 unit_start_on_failure(u
, "OnFailure=", UNIT_ATOM_ON_FAILURE
, u
->on_failure_job_mode
);
2803 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2804 /* This unit just finished starting up */
2806 unit_emit_audit_start(u
);
2807 manager_send_unit_plymouth(m
, u
);
2810 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2811 /* This unit just stopped/failed. */
2813 unit_emit_audit_stop(u
, ns
);
2814 unit_log_resources(u
);
2817 if (ns
== UNIT_INACTIVE
&& !IN_SET(os
, UNIT_FAILED
, UNIT_INACTIVE
, UNIT_MAINTENANCE
))
2818 unit_start_on_failure(u
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
, u
->on_success_job_mode
);
2821 manager_recheck_journal(m
);
2822 manager_recheck_dbus(m
);
2824 unit_trigger_notify(u
);
2826 if (!MANAGER_IS_RELOADING(m
)) {
2827 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2828 reason
= strjoina("unit ", u
->id
, " failed");
2829 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2830 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2831 reason
= strjoina("unit ", u
->id
, " succeeded");
2832 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2836 /* And now, add the unit or depending units to various queues that will act on the new situation if
2837 * needed. These queues generally check for continuous state changes rather than events (like most of
2838 * the state propagation above), and do work deferred instead of instantly, since they typically
2839 * don't want to run during reloading, and usually involve checking combined state of multiple units
2842 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2843 /* Stop unneeded units and bound-by units regardless if going down was expected or not */
2844 check_unneeded_dependencies(u
);
2845 check_bound_by_dependencies(u
);
2847 /* Maybe someone wants us to remain up? */
2848 unit_submit_to_start_when_upheld_queue(u
);
2850 /* Maybe the unit should be GC'ed now? */
2851 unit_add_to_gc_queue(u
);
2853 /* Maybe we can release some resources now? */
2854 unit_submit_to_release_resources_queue(u
);
2857 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2858 /* Start uphold units regardless if going up was expected or not */
2859 check_uphold_dependencies(u
);
2861 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2862 unit_submit_to_stop_when_unneeded_queue(u
);
2864 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens
2865 * when something BindsTo= to a Type=oneshot unit, as these units go directly from starting to
2866 * inactive, without ever entering started.) */
2867 unit_submit_to_stop_when_bound_queue(u
);
2871 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2875 assert(pid_is_valid(pid
));
2877 /* Watch a specific PID */
2879 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2880 * opportunity to remove any stalled references to this PID as they can be created
2881 * easily (when watching a process which is not our direct child). */
2883 manager_unwatch_pid(u
->manager
, pid
);
2885 r
= set_ensure_allocated(&u
->pids
, NULL
);
2889 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2893 /* First try, let's add the unit keyed by "pid". */
2894 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2900 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2901 * to an array of Units rather than just a Unit), lists us already. */
2903 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2905 for (; array
[n
]; n
++)
2909 if (found
) /* Found it already? if so, do nothing */
2914 /* Allocate a new array */
2915 new_array
= new(Unit
*, n
+ 2);
2919 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2921 new_array
[n
+1] = NULL
;
2923 /* Add or replace the old array */
2924 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2935 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2942 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2946 assert(pid_is_valid(pid
));
2948 /* First let's drop the unit in case it's keyed as "pid". */
2949 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2951 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2952 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2954 /* Let's iterate through the array, dropping our own entry */
2957 for (size_t n
= 0; array
[n
]; n
++)
2959 array
[m
++] = array
[n
];
2963 /* The array is now empty, remove the entire entry */
2964 assert_se(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2969 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2972 void unit_unwatch_all_pids(Unit
*u
) {
2975 while (!set_isempty(u
->pids
))
2976 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2978 u
->pids
= set_free(u
->pids
);
2981 static void unit_tidy_watch_pids(Unit
*u
) {
2982 pid_t except1
, except2
;
2987 /* Cleans dead PIDs from our list */
2989 except1
= unit_main_pid(u
);
2990 except2
= unit_control_pid(u
);
2992 SET_FOREACH(e
, u
->pids
) {
2993 pid_t pid
= PTR_TO_PID(e
);
2995 if (pid
== except1
|| pid
== except2
)
2998 if (!pid_is_unwaited(pid
))
2999 unit_unwatch_pid(u
, pid
);
3003 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
3004 Unit
*u
= ASSERT_PTR(userdata
);
3008 unit_tidy_watch_pids(u
);
3009 unit_watch_all_pids(u
);
3011 /* If the PID set is empty now, then let's finish this off. */
3012 unit_synthesize_cgroup_empty_event(u
);
3017 int unit_enqueue_rewatch_pids(Unit
*u
) {
3022 if (!u
->cgroup_path
)
3025 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
3028 if (r
> 0) /* On unified we can use proper notifications */
3031 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
3032 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
3033 * involves issuing kill(pid, 0) on all processes we watch. */
3035 if (!u
->rewatch_pids_event_source
) {
3036 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
3038 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
3040 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
3042 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
3044 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
3046 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
3048 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
3051 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
3053 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
3058 void unit_dequeue_rewatch_pids(Unit
*u
) {
3062 if (!u
->rewatch_pids_event_source
)
3065 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
3067 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
3069 u
->rewatch_pids_event_source
= sd_event_source_disable_unref(u
->rewatch_pids_event_source
);
3072 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
3074 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
3078 case JOB_VERIFY_ACTIVE
:
3081 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
3082 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
3087 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
3088 * external events), hence it makes no sense to permit enqueuing such a request either. */
3089 return !u
->perpetual
;
3092 case JOB_TRY_RESTART
:
3093 return unit_can_stop(u
) && unit_can_start(u
);
3096 case JOB_TRY_RELOAD
:
3097 return unit_can_reload(u
);
3099 case JOB_RELOAD_OR_START
:
3100 return unit_can_reload(u
) && unit_can_start(u
);
3103 assert_not_reached();
3107 int unit_add_dependency(
3112 UnitDependencyMask mask
) {
3114 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
3115 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
3116 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
3117 [UNIT_WANTS
] = UNIT_WANTED_BY
,
3118 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
3119 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
3120 [UNIT_UPHOLDS
] = UNIT_UPHELD_BY
,
3121 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
3122 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
3123 [UNIT_WANTED_BY
] = UNIT_WANTS
,
3124 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
3125 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
3126 [UNIT_UPHELD_BY
] = UNIT_UPHOLDS
,
3127 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
3128 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
3129 [UNIT_BEFORE
] = UNIT_AFTER
,
3130 [UNIT_AFTER
] = UNIT_BEFORE
,
3131 [UNIT_ON_SUCCESS
] = UNIT_ON_SUCCESS_OF
,
3132 [UNIT_ON_SUCCESS_OF
] = UNIT_ON_SUCCESS
,
3133 [UNIT_ON_FAILURE
] = UNIT_ON_FAILURE_OF
,
3134 [UNIT_ON_FAILURE_OF
] = UNIT_ON_FAILURE
,
3135 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
3136 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
3137 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3138 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3139 [UNIT_PROPAGATES_STOP_TO
] = UNIT_STOP_PROPAGATED_FROM
,
3140 [UNIT_STOP_PROPAGATED_FROM
] = UNIT_PROPAGATES_STOP_TO
,
3141 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
, /* symmetric! 👓 */
3142 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3143 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3144 [UNIT_IN_SLICE
] = UNIT_SLICE_OF
,
3145 [UNIT_SLICE_OF
] = UNIT_IN_SLICE
,
3147 UnitDependencyAtom a
;
3150 /* Helper to know whether sending a notification is necessary or not: if the dependency is already
3151 * there, no need to notify! */
3152 bool notify
, notify_other
= false;
3155 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3158 u
= unit_follow_merge(u
);
3159 other
= unit_follow_merge(other
);
3160 a
= unit_dependency_to_atom(d
);
3163 /* We won't allow dependencies on ourselves. We will not consider them an error however. */
3165 if (unit_should_warn_about_dependency(d
))
3166 log_unit_warning(u
, "Dependency %s=%s is dropped.",
3167 unit_dependency_to_string(d
), u
->id
);
3171 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3174 /* Note that ordering a device unit after a unit is permitted since it allows to start its job
3175 * running timeout at a specific time. */
3176 if (FLAGS_SET(a
, UNIT_ATOM_BEFORE
) && other
->type
== UNIT_DEVICE
) {
3177 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3181 if (FLAGS_SET(a
, UNIT_ATOM_ON_FAILURE
) && !UNIT_VTABLE(u
)->can_fail
) {
3182 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3186 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERS
) && !UNIT_VTABLE(u
)->can_trigger
)
3187 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3188 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3189 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERED_BY
) && !UNIT_VTABLE(other
)->can_trigger
)
3190 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3191 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3193 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && other
->type
!= UNIT_SLICE
)
3194 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3195 "Requested dependency Slice=%s refused (%s is not a slice unit).", other
->id
, other
->id
);
3196 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && u
->type
!= UNIT_SLICE
)
3197 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3198 "Requested dependency SliceOf=%s refused (%s is not a slice unit).", other
->id
, u
->id
);
3200 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && !UNIT_HAS_CGROUP_CONTEXT(u
))
3201 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3202 "Requested dependency Slice=%s refused (%s is not a cgroup unit).", other
->id
, u
->id
);
3204 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && !UNIT_HAS_CGROUP_CONTEXT(other
))
3205 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3206 "Requested dependency SliceOf=%s refused (%s is not a cgroup unit).", other
->id
, other
->id
);
3208 r
= unit_add_dependency_hashmap(&u
->dependencies
, d
, other
, mask
, 0);
3213 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
3214 r
= unit_add_dependency_hashmap(&other
->dependencies
, inverse_table
[d
], u
, 0, mask
);
3217 notify_other
= r
> 0;
3220 if (add_reference
) {
3221 r
= unit_add_dependency_hashmap(&u
->dependencies
, UNIT_REFERENCES
, other
, mask
, 0);
3224 notify
= notify
|| r
> 0;
3226 r
= unit_add_dependency_hashmap(&other
->dependencies
, UNIT_REFERENCED_BY
, u
, 0, mask
);
3229 notify_other
= notify_other
|| r
> 0;
3233 unit_add_to_dbus_queue(u
);
3235 unit_add_to_dbus_queue(other
);
3237 return notify
|| notify_other
;
3240 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3245 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3249 s
= unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3253 return r
> 0 || s
> 0;
3256 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3264 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3271 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3273 _cleanup_free_
char *i
= NULL
;
3275 r
= unit_name_to_prefix(u
->id
, &i
);
3279 r
= unit_name_replace_instance(name
, i
, buf
);
3288 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3289 _cleanup_free_
char *buf
= NULL
;
3296 r
= resolve_template(u
, name
, &buf
, &name
);
3300 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3303 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3307 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3310 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3311 _cleanup_free_
char *buf
= NULL
;
3318 r
= resolve_template(u
, name
, &buf
, &name
);
3322 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3325 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3329 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3332 int set_unit_path(const char *p
) {
3333 /* This is mostly for debug purposes */
3334 return RET_NERRNO(setenv("SYSTEMD_UNIT_PATH", p
, 1));
3337 char *unit_dbus_path(Unit
*u
) {
3343 return unit_dbus_path_from_name(u
->id
);
3346 char *unit_dbus_path_invocation_id(Unit
*u
) {
3349 if (sd_id128_is_null(u
->invocation_id
))
3352 return unit_dbus_path_from_name(u
->invocation_id_string
);
3355 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3360 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3362 if (sd_id128_equal(u
->invocation_id
, id
))
3365 if (!sd_id128_is_null(u
->invocation_id
))
3366 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3368 if (sd_id128_is_null(id
)) {
3373 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3377 u
->invocation_id
= id
;
3378 sd_id128_to_string(id
, u
->invocation_id_string
);
3380 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3387 u
->invocation_id
= SD_ID128_NULL
;
3388 u
->invocation_id_string
[0] = 0;
3392 int unit_set_slice(Unit
*u
, Unit
*slice
) {
3398 /* Sets the unit slice if it has not been set before. Is extra careful, to only allow this for units
3399 * that actually have a cgroup context. Also, we don't allow to set this for slices (since the parent
3400 * slice is derived from the name). Make sure the unit we set is actually a slice. */
3402 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3405 if (u
->type
== UNIT_SLICE
)
3408 if (unit_active_state(u
) != UNIT_INACTIVE
)
3411 if (slice
->type
!= UNIT_SLICE
)
3414 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3415 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3418 if (UNIT_GET_SLICE(u
) == slice
)
3421 /* Disallow slice changes if @u is already bound to cgroups */
3422 if (UNIT_GET_SLICE(u
) && u
->cgroup_realized
)
3425 /* Remove any slices assigned prior; we should only have one UNIT_IN_SLICE dependency */
3426 if (UNIT_GET_SLICE(u
))
3427 unit_remove_dependencies(u
, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3429 r
= unit_add_dependency(u
, UNIT_IN_SLICE
, slice
, true, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3436 int unit_set_default_slice(Unit
*u
) {
3437 const char *slice_name
;
3443 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3446 if (UNIT_GET_SLICE(u
))
3450 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3452 /* Implicitly place all instantiated units in their
3453 * own per-template slice */
3455 r
= unit_name_to_prefix(u
->id
, &prefix
);
3459 /* The prefix is already escaped, but it might include
3460 * "-" which has a special meaning for slice units,
3461 * hence escape it here extra. */
3462 escaped
= unit_name_escape(prefix
);
3466 if (MANAGER_IS_SYSTEM(u
->manager
))
3467 slice_name
= strjoina("system-", escaped
, ".slice");
3469 slice_name
= strjoina("app-", escaped
, ".slice");
3471 } else if (unit_is_extrinsic(u
))
3472 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3473 * the root slice. They don't really belong in one of the subslices. */
3474 slice_name
= SPECIAL_ROOT_SLICE
;
3476 else if (MANAGER_IS_SYSTEM(u
->manager
))
3477 slice_name
= SPECIAL_SYSTEM_SLICE
;
3479 slice_name
= SPECIAL_APP_SLICE
;
3481 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3485 return unit_set_slice(u
, slice
);
3488 const char *unit_slice_name(Unit
*u
) {
3492 slice
= UNIT_GET_SLICE(u
);
3499 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3500 _cleanup_free_
char *t
= NULL
;
3507 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3510 if (unit_has_name(u
, t
))
3513 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3514 assert(r
< 0 || *_found
!= u
);
3518 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3519 const char *new_owner
;
3520 Unit
*u
= ASSERT_PTR(userdata
);
3525 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3527 bus_log_parse_error(r
);
3531 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3532 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3537 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3538 const sd_bus_error
*e
;
3539 const char *new_owner
;
3540 Unit
*u
= ASSERT_PTR(userdata
);
3545 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3547 e
= sd_bus_message_get_error(message
);
3549 if (!sd_bus_error_has_name(e
, SD_BUS_ERROR_NAME_HAS_NO_OWNER
)) {
3550 r
= sd_bus_error_get_errno(e
);
3551 log_unit_error_errno(u
, r
,
3552 "Unexpected error response from GetNameOwner(): %s",
3553 bus_error_message(e
, r
));
3558 r
= sd_bus_message_read(message
, "s", &new_owner
);
3560 return bus_log_parse_error(r
);
3562 assert(!isempty(new_owner
));
3565 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3566 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3571 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3579 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3582 match
= strjoina("type='signal',"
3583 "sender='org.freedesktop.DBus',"
3584 "path='/org/freedesktop/DBus',"
3585 "interface='org.freedesktop.DBus',"
3586 "member='NameOwnerChanged',"
3587 "arg0='", name
, "'");
3589 r
= sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3593 r
= sd_bus_call_method_async(
3595 &u
->get_name_owner_slot
,
3596 "org.freedesktop.DBus",
3597 "/org/freedesktop/DBus",
3598 "org.freedesktop.DBus",
3600 get_name_owner_handler
,
3604 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3608 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3612 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3618 /* Watch a specific name on the bus. We only support one unit
3619 * watching each name for now. */
3621 if (u
->manager
->api_bus
) {
3622 /* If the bus is already available, install the match directly.
3623 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3624 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3626 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3629 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3631 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3632 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3633 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3639 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3643 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3644 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3645 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3648 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3649 _cleanup_free_
char *e
= NULL
;
3655 /* Adds in links to the device node that this unit is based on */
3659 if (!is_device_path(what
))
3662 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3663 if (!unit_type_supported(UNIT_DEVICE
))
3666 r
= unit_name_from_path(what
, ".device", &e
);
3670 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3674 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3675 dep
= UNIT_BINDS_TO
;
3677 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3678 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3679 device
, true, mask
);
3682 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3683 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3691 if (!path_startswith(what
, "/dev/"))
3694 /* If we don't support devices, then also don't bother with blockdev@.target */
3695 if (!unit_type_supported(UNIT_DEVICE
))
3698 r
= unit_name_path_escape(what
, &escaped
);
3702 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3706 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3709 int unit_coldplug(Unit
*u
) {
3714 /* Make sure we don't enter a loop, when coldplugging recursively. */
3718 u
->coldplugged
= true;
3720 STRV_FOREACH(i
, u
->deserialized_refs
) {
3721 q
= bus_unit_track_add_name(u
, *i
);
3722 if (q
< 0 && r
>= 0)
3725 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3727 if (UNIT_VTABLE(u
)->coldplug
) {
3728 q
= UNIT_VTABLE(u
)->coldplug(u
);
3729 if (q
< 0 && r
>= 0)
3734 q
= job_coldplug(u
->job
);
3735 if (q
< 0 && r
>= 0)
3739 q
= job_coldplug(u
->nop_job
);
3740 if (q
< 0 && r
>= 0)
3747 void unit_catchup(Unit
*u
) {
3750 if (UNIT_VTABLE(u
)->catchup
)
3751 UNIT_VTABLE(u
)->catchup(u
);
3753 unit_cgroup_catchup(u
);
3756 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3762 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3763 * are never out-of-date. */
3764 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3767 if (stat(path
, &st
) < 0)
3768 /* What, cannot access this anymore? */
3772 /* For masked files check if they are still so */
3773 return !null_or_empty(&st
);
3775 /* For non-empty files check the mtime */
3776 return timespec_load(&st
.st_mtim
) > mtime
;
3781 bool unit_need_daemon_reload(Unit
*u
) {
3782 _cleanup_strv_free_
char **t
= NULL
;
3786 /* For unit files, we allow masking… */
3787 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3788 u
->load_state
== UNIT_MASKED
))
3791 /* Source paths should not be masked… */
3792 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3795 if (u
->load_state
== UNIT_LOADED
)
3796 (void) unit_find_dropin_paths(u
, &t
);
3797 if (!strv_equal(u
->dropin_paths
, t
))
3800 /* … any drop-ins that are masked are simply omitted from the list. */
3801 STRV_FOREACH(path
, u
->dropin_paths
)
3802 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3808 void unit_reset_failed(Unit
*u
) {
3811 if (UNIT_VTABLE(u
)->reset_failed
)
3812 UNIT_VTABLE(u
)->reset_failed(u
);
3814 ratelimit_reset(&u
->start_ratelimit
);
3815 u
->start_limit_hit
= false;
3818 Unit
*unit_following(Unit
*u
) {
3821 if (UNIT_VTABLE(u
)->following
)
3822 return UNIT_VTABLE(u
)->following(u
);
3827 bool unit_stop_pending(Unit
*u
) {
3830 /* This call does check the current state of the unit. It's
3831 * hence useful to be called from state change calls of the
3832 * unit itself, where the state isn't updated yet. This is
3833 * different from unit_inactive_or_pending() which checks both
3834 * the current state and for a queued job. */
3836 return unit_has_job_type(u
, JOB_STOP
);
3839 bool unit_inactive_or_pending(Unit
*u
) {
3842 /* Returns true if the unit is inactive or going down */
3844 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3847 if (unit_stop_pending(u
))
3853 bool unit_active_or_pending(Unit
*u
) {
3856 /* Returns true if the unit is active or going up */
3858 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3862 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3868 bool unit_will_restart_default(Unit
*u
) {
3871 return unit_has_job_type(u
, JOB_START
);
3874 bool unit_will_restart(Unit
*u
) {
3877 if (!UNIT_VTABLE(u
)->will_restart
)
3880 return UNIT_VTABLE(u
)->will_restart(u
);
3883 int unit_kill(Unit
*u
, KillWho w
, int signo
, int code
, int value
, sd_bus_error
*error
) {
3885 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3886 assert(SIGNAL_VALID(signo
));
3887 assert(IN_SET(code
, SI_USER
, SI_QUEUE
));
3889 if (!UNIT_VTABLE(u
)->kill
)
3892 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, code
, value
, error
);
3895 void unit_notify_cgroup_oom(Unit
*u
, bool managed_oom
) {
3898 if (UNIT_VTABLE(u
)->notify_cgroup_oom
)
3899 UNIT_VTABLE(u
)->notify_cgroup_oom(u
, managed_oom
);
3902 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3903 _cleanup_set_free_ Set
*pid_set
= NULL
;
3906 pid_set
= set_new(NULL
);
3910 /* Exclude the main/control pids from being killed via the cgroup */
3912 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3917 if (control_pid
> 0) {
3918 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3923 return TAKE_PTR(pid_set
);
3926 static int kill_common_log(pid_t pid
, int signo
, void *userdata
) {
3927 _cleanup_free_
char *comm
= NULL
;
3928 Unit
*u
= ASSERT_PTR(userdata
);
3930 (void) get_process_comm(pid
, &comm
);
3931 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
3932 signal_to_string(signo
), pid
, strna(comm
));
3937 static int kill_or_sigqueue(pid_t pid
, int signo
, int code
, int value
) {
3939 assert(SIGNAL_VALID(signo
));
3944 log_debug("Killing " PID_FMT
" with signal SIG%s.", pid
, signal_to_string(signo
));
3945 return RET_NERRNO(kill(pid
, signo
));
3948 log_debug("Enqueuing value %i to " PID_FMT
" on signal SIG%s.", value
, pid
, signal_to_string(signo
));
3949 return RET_NERRNO(sigqueue(pid
, signo
, (const union sigval
) { .sival_int
= value
}));
3952 assert_not_reached();
3956 int unit_kill_common(
3964 sd_bus_error
*error
) {
3966 bool killed
= false;
3969 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
3970 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
3971 * stop a service ourselves. */
3975 assert(who
< _KILL_WHO_MAX
);
3976 assert(SIGNAL_VALID(signo
));
3977 assert(IN_SET(code
, SI_USER
, SI_QUEUE
));
3979 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3981 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3983 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3986 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3987 if (control_pid
< 0)
3988 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3989 if (control_pid
== 0)
3990 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3993 if (control_pid
> 0 &&
3994 IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
)) {
3995 _cleanup_free_
char *comm
= NULL
;
3996 (void) get_process_comm(control_pid
, &comm
);
3998 r
= kill_or_sigqueue(control_pid
, signo
, code
, value
);
4002 /* Report this failure both to the logs and to the client */
4003 sd_bus_error_set_errnof(
4005 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
4006 signal_to_string(signo
), control_pid
, strna(comm
));
4007 log_unit_warning_errno(
4009 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
4010 signal_to_string(signo
), control_pid
, strna(comm
));
4012 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
4013 signal_to_string(signo
), control_pid
, strna(comm
));
4019 IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
)) {
4021 _cleanup_free_
char *comm
= NULL
;
4022 (void) get_process_comm(main_pid
, &comm
);
4024 r
= kill_or_sigqueue(main_pid
, signo
, code
, value
);
4029 sd_bus_error_set_errnof(
4031 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
4032 signal_to_string(signo
), main_pid
, strna(comm
));
4035 log_unit_warning_errno(
4037 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
4038 signal_to_string(signo
), main_pid
, strna(comm
));
4041 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
4042 signal_to_string(signo
), main_pid
, strna(comm
));
4047 /* Note: if we shall enqueue rather than kill we won't do this via the cgroup mechanism, since it
4048 * doesn't really make much sense (and given that enqueued values are a relatively expensive
4049 * resource, and we shouldn't allow us to be subjects for such allocation sprees) */
4050 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
&& code
== SI_USER
) {
4051 _cleanup_set_free_ Set
*pid_set
= NULL
;
4053 /* Exclude the main/control pids from being killed via the cgroup */
4054 pid_set
= unit_pid_set(main_pid
, control_pid
);
4058 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
4060 if (!IN_SET(r
, -ESRCH
, -ENOENT
)) {
4064 sd_bus_error_set_errnof(
4066 "Failed to send signal SIG%s to auxiliary processes: %m",
4067 signal_to_string(signo
));
4070 log_unit_warning_errno(
4072 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
4073 signal_to_string(signo
));
4079 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
4080 if (ret
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
4081 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
4086 int unit_following_set(Unit
*u
, Set
**s
) {
4090 if (UNIT_VTABLE(u
)->following_set
)
4091 return UNIT_VTABLE(u
)->following_set(u
, s
);
4097 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
4102 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
4103 r
= unit_file_get_state(
4104 u
->manager
->runtime_scope
,
4107 &u
->unit_file_state
);
4109 u
->unit_file_state
= UNIT_FILE_BAD
;
4112 return u
->unit_file_state
;
4115 PresetAction
unit_get_unit_file_preset(Unit
*u
) {
4120 if (u
->unit_file_preset
< 0 && u
->fragment_path
) {
4121 _cleanup_free_
char *bn
= NULL
;
4123 r
= path_extract_filename(u
->fragment_path
, &bn
);
4125 return (u
->unit_file_preset
= r
);
4127 if (r
== O_DIRECTORY
)
4128 return (u
->unit_file_preset
= -EISDIR
);
4130 u
->unit_file_preset
= unit_file_query_preset(
4131 u
->manager
->runtime_scope
,
4137 return u
->unit_file_preset
;
4140 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
4146 unit_ref_unset(ref
);
4148 ref
->source
= source
;
4149 ref
->target
= target
;
4150 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
4154 void unit_ref_unset(UnitRef
*ref
) {
4160 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
4161 * be unreferenced now. */
4162 unit_add_to_gc_queue(ref
->target
);
4164 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
4165 ref
->source
= ref
->target
= NULL
;
4168 static int user_from_unit_name(Unit
*u
, char **ret
) {
4170 static const uint8_t hash_key
[] = {
4171 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4172 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4175 _cleanup_free_
char *n
= NULL
;
4178 r
= unit_name_to_prefix(u
->id
, &n
);
4182 if (valid_user_group_name(n
, 0)) {
4187 /* If we can't use the unit name as a user name, then let's hash it and use that */
4188 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4194 int unit_patch_contexts(Unit
*u
) {
4201 /* Patch in the manager defaults into the exec and cgroup
4202 * contexts, _after_ the rest of the settings have been
4205 ec
= unit_get_exec_context(u
);
4207 /* This only copies in the ones that need memory */
4208 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
4209 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4210 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4215 if (MANAGER_IS_USER(u
->manager
) &&
4216 !ec
->working_directory
) {
4218 r
= get_home_dir(&ec
->working_directory
);
4222 /* Allow user services to run, even if the
4223 * home directory is missing */
4224 ec
->working_directory_missing_ok
= true;
4227 if (ec
->private_devices
)
4228 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4230 if (ec
->protect_kernel_modules
)
4231 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4233 if (ec
->protect_kernel_logs
)
4234 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4236 if (ec
->protect_clock
)
4237 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4239 if (ec
->dynamic_user
) {
4241 r
= user_from_unit_name(u
, &ec
->user
);
4247 ec
->group
= strdup(ec
->user
);
4252 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4253 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4256 ec
->private_tmp
= true;
4257 ec
->remove_ipc
= true;
4258 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4259 if (ec
->protect_home
== PROTECT_HOME_NO
)
4260 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4262 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4264 ec
->no_new_privileges
= true;
4265 ec
->restrict_suid_sgid
= true;
4268 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++)
4269 exec_directory_sort(ec
->directories
+ dt
);
4272 cc
= unit_get_cgroup_context(u
);
4275 if (ec
->private_devices
&&
4276 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4277 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4279 /* Only add these if needed, as they imply that everything else is blocked. */
4280 if (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
) {
4281 if (ec
->root_image
|| ec
->mount_images
) {
4283 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4284 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4285 r
= cgroup_add_device_allow(cc
, p
, "rw");
4289 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4290 r
= cgroup_add_device_allow(cc
, p
, "rwm");
4295 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4296 * Same for mapper and verity. */
4297 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4298 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4304 if (ec
->protect_clock
) {
4305 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4310 /* If there are encrypted credentials we might need to access the TPM. */
4311 if (exec_context_has_encrypted_credentials(ec
)) {
4312 r
= cgroup_add_device_allow(cc
, "char-tpm", "rw");
4322 ExecContext
*unit_get_exec_context(const Unit
*u
) {
4329 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4333 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4336 KillContext
*unit_get_kill_context(Unit
*u
) {
4343 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4347 return (KillContext
*) ((uint8_t*) u
+ offset
);
4350 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4356 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4360 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4363 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4369 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4373 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4376 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4379 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4382 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4383 return u
->manager
->lookup_paths
.transient
;
4385 if (flags
& UNIT_PERSISTENT
)
4386 return u
->manager
->lookup_paths
.persistent_control
;
4388 if (flags
& UNIT_RUNTIME
)
4389 return u
->manager
->lookup_paths
.runtime_control
;
4394 const char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4396 assert(popcount(flags
& (UNIT_ESCAPE_EXEC_SYNTAX_ENV
| UNIT_ESCAPE_EXEC_SYNTAX
| UNIT_ESCAPE_C
)) <= 1);
4399 _cleanup_free_
char *t
= NULL
;
4401 /* Returns a string with any escaping done. If no escaping was necessary, *buf is set to NULL, and
4402 * the input pointer is returned as-is. If an allocation was needed, the return buffer pointer is
4403 * written to *buf. This means the return value always contains a properly escaped version, but *buf
4404 * only contains a pointer if an allocation was made. Callers can use this to optimize memory
4407 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4408 t
= specifier_escape(s
);
4415 /* We either do C-escaping or shell-escaping, to additionally escape characters that we parse for
4416 * ExecStart= and friends, i.e. '$' and quotes. */
4418 if (flags
& (UNIT_ESCAPE_EXEC_SYNTAX_ENV
| UNIT_ESCAPE_EXEC_SYNTAX
)) {
4421 if (flags
& UNIT_ESCAPE_EXEC_SYNTAX_ENV
) {
4422 t2
= strreplace(s
, "$", "$$");
4425 free_and_replace(t
, t2
);
4428 t2
= shell_escape(t
?: s
, "\"");
4431 free_and_replace(t
, t2
);
4435 } else if (flags
& UNIT_ESCAPE_C
) {
4441 free_and_replace(t
, t2
);
4450 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4451 _cleanup_free_
char *result
= NULL
;
4454 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command
4455 * lines in a way suitable for ExecStart= stanzas. */
4457 STRV_FOREACH(i
, l
) {
4458 _cleanup_free_
char *buf
= NULL
;
4463 p
= unit_escape_setting(*i
, flags
, &buf
);
4467 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4468 if (!GREEDY_REALLOC(result
, n
+ a
+ 1))
4482 if (!GREEDY_REALLOC(result
, n
+ 1))
4487 return TAKE_PTR(result
);
4490 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4491 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4492 const char *dir
, *wrapped
;
4499 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4502 data
= unit_escape_setting(data
, flags
, &escaped
);
4506 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4507 * previous section header is the same */
4509 if (flags
& UNIT_PRIVATE
) {
4510 if (!UNIT_VTABLE(u
)->private_section
)
4513 if (!u
->transient_file
|| u
->last_section_private
< 0)
4514 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4515 else if (u
->last_section_private
== 0)
4516 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4518 if (!u
->transient_file
|| u
->last_section_private
< 0)
4519 data
= strjoina("[Unit]\n", data
);
4520 else if (u
->last_section_private
> 0)
4521 data
= strjoina("\n[Unit]\n", data
);
4524 if (u
->transient_file
) {
4525 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4526 * write to the transient unit file. */
4527 fputs(data
, u
->transient_file
);
4529 if (!endswith(data
, "\n"))
4530 fputc('\n', u
->transient_file
);
4532 /* Remember which section we wrote this entry to */
4533 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4537 dir
= unit_drop_in_dir(u
, flags
);
4541 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4542 "# or an equivalent operation. Do not edit.\n",
4546 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4550 (void) mkdir_p_label(p
, 0755);
4552 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4553 * recreate the cache after every drop-in we write. */
4554 if (u
->manager
->unit_path_cache
) {
4555 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4560 r
= write_string_file_atomic_label(q
, wrapped
);
4564 r
= strv_push(&u
->dropin_paths
, q
);
4569 strv_uniq(u
->dropin_paths
);
4571 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4576 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4577 _cleanup_free_
char *p
= NULL
;
4585 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4588 va_start(ap
, format
);
4589 r
= vasprintf(&p
, format
, ap
);
4595 return unit_write_setting(u
, flags
, name
, p
);
4598 int unit_make_transient(Unit
*u
) {
4599 _cleanup_free_
char *path
= NULL
;
4604 if (!UNIT_VTABLE(u
)->can_transient
)
4607 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4609 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4613 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4614 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4617 f
= fopen(path
, "we");
4622 safe_fclose(u
->transient_file
);
4623 u
->transient_file
= f
;
4625 free_and_replace(u
->fragment_path
, path
);
4627 u
->source_path
= mfree(u
->source_path
);
4628 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4629 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4631 u
->load_state
= UNIT_STUB
;
4633 u
->transient
= true;
4635 unit_add_to_dbus_queue(u
);
4636 unit_add_to_gc_queue(u
);
4638 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4644 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4645 _cleanup_free_
char *comm
= NULL
;
4647 (void) get_process_comm(pid
, &comm
);
4649 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4650 only, like for example systemd's own PAM stub process. */
4651 if (comm
&& comm
[0] == '(')
4652 /* Although we didn't log anything, as this callback is used in unit_kill_context we must return 1
4653 * here to let the manager know that a process was killed. */
4656 log_unit_notice(userdata
,
4657 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4660 signal_to_string(sig
));
4665 static int operation_to_signal(
4666 const KillContext
*c
,
4668 bool *ret_noteworthy
) {
4674 case KILL_TERMINATE
:
4675 case KILL_TERMINATE_AND_LOG
:
4676 *ret_noteworthy
= false;
4677 return c
->kill_signal
;
4680 *ret_noteworthy
= false;
4681 return restart_kill_signal(c
);
4684 *ret_noteworthy
= true;
4685 return c
->final_kill_signal
;
4688 *ret_noteworthy
= true;
4689 return c
->watchdog_signal
;
4692 assert_not_reached();
4696 int unit_kill_context(
4702 bool main_pid_alien
) {
4704 bool wait_for_exit
= false, send_sighup
;
4705 cg_kill_log_func_t log_func
= NULL
;
4711 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
4712 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
4713 * which is used for user-requested killing of unit processes. */
4715 if (c
->kill_mode
== KILL_NONE
)
4719 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4721 log_func
= log_kill
;
4725 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4730 log_func(main_pid
, sig
, u
);
4732 r
= kill_and_sigcont(main_pid
, sig
);
4733 if (r
< 0 && r
!= -ESRCH
) {
4734 _cleanup_free_
char *comm
= NULL
;
4735 (void) get_process_comm(main_pid
, &comm
);
4737 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4739 if (!main_pid_alien
)
4740 wait_for_exit
= true;
4742 if (r
!= -ESRCH
&& send_sighup
)
4743 (void) kill(main_pid
, SIGHUP
);
4747 if (control_pid
> 0) {
4749 log_func(control_pid
, sig
, u
);
4751 r
= kill_and_sigcont(control_pid
, sig
);
4752 if (r
< 0 && r
!= -ESRCH
) {
4753 _cleanup_free_
char *comm
= NULL
;
4754 (void) get_process_comm(control_pid
, &comm
);
4756 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4758 wait_for_exit
= true;
4760 if (r
!= -ESRCH
&& send_sighup
)
4761 (void) kill(control_pid
, SIGHUP
);
4765 if (u
->cgroup_path
&&
4766 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4767 _cleanup_set_free_ Set
*pid_set
= NULL
;
4769 /* Exclude the main/control pids from being killed via the cgroup */
4770 pid_set
= unit_pid_set(main_pid
, control_pid
);
4774 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4776 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4780 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4781 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
4785 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4786 * we are running in a container or if this is a delegation unit, simply because cgroup
4787 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4788 * of containers it can be confused easily by left-over directories in the cgroup — which
4789 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4790 * there we get proper events. Hence rely on them. */
4792 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4793 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4794 wait_for_exit
= true;
4799 pid_set
= unit_pid_set(main_pid
, control_pid
);
4803 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4812 return wait_for_exit
;
4815 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4821 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these
4822 * paths in the unit (from the path to the UnitDependencyInfo structure indicating how to the
4823 * dependency came to be). However, we build a prefix table for all possible prefixes so that new
4824 * appearing mount units can easily determine which units to make themselves a dependency of. */
4826 if (!path_is_absolute(path
))
4829 if (hashmap_contains(u
->requires_mounts_for
, path
)) /* Exit quickly if the path is already covered. */
4832 _cleanup_free_
char *p
= strdup(path
);
4836 /* Use the canonical form of the path as the stored key. We call path_is_normalized()
4837 * only after simplification, since path_is_normalized() rejects paths with '.'.
4838 * path_is_normalized() also verifies that the path fits in PATH_MAX. */
4839 path
= path_simplify(p
);
4841 if (!path_is_normalized(path
))
4844 UnitDependencyInfo di
= {
4848 r
= hashmap_ensure_put(&u
->requires_mounts_for
, &path_hash_ops
, p
, di
.data
);
4852 TAKE_PTR(p
); /* path remains a valid pointer to the string stored in the hashmap */
4854 char prefix
[strlen(path
) + 1];
4855 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4858 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4860 _cleanup_free_
char *q
= NULL
;
4862 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4874 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4890 int unit_setup_exec_runtime(Unit
*u
) {
4891 _cleanup_(exec_shared_runtime_unrefp
) ExecSharedRuntime
*esr
= NULL
;
4892 _cleanup_(dynamic_creds_unrefp
) DynamicCreds
*dcreds
= NULL
;
4899 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4902 /* Check if there already is an ExecRuntime for this unit? */
4903 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4907 ec
= unit_get_exec_context(u
);
4910 /* Try to get it from somebody else */
4911 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_JOINS_NAMESPACE_OF
) {
4912 r
= exec_shared_runtime_acquire(u
->manager
, NULL
, other
->id
, false, &esr
);
4920 r
= exec_shared_runtime_acquire(u
->manager
, ec
, u
->id
, true, &esr
);
4925 if (ec
->dynamic_user
) {
4926 r
= dynamic_creds_make(u
->manager
, ec
->user
, ec
->group
, &dcreds
);
4931 r
= exec_runtime_make(esr
, dcreds
, rt
);
4941 bool unit_type_supported(UnitType t
) {
4942 static int8_t cache
[_UNIT_TYPE_MAX
] = {}; /* -1: disabled, 1: enabled: 0: don't know */
4945 if (_unlikely_(t
< 0))
4947 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4950 if (cache
[t
] == 0) {
4953 e
= strjoina("SYSTEMD_SUPPORT_", unit_type_to_string(t
));
4955 r
= getenv_bool(ascii_strupper(e
));
4956 if (r
< 0 && r
!= -ENXIO
)
4957 log_debug_errno(r
, "Failed to parse $%s, ignoring: %m", e
);
4959 cache
[t
] = r
== 0 ? -1 : 1;
4964 if (!unit_vtable
[t
]->supported
)
4967 return unit_vtable
[t
]->supported();
4970 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4976 if (!unit_log_level_test(u
, LOG_NOTICE
))
4979 r
= dir_is_empty(where
, /* ignore_hidden_or_backup= */ false);
4980 if (r
> 0 || r
== -ENOTDIR
)
4983 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4987 log_unit_struct(u
, LOG_NOTICE
,
4988 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4989 LOG_UNIT_INVOCATION_ID(u
),
4990 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4994 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4995 _cleanup_free_
char *canonical_where
= NULL
;
5001 r
= chase(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
5003 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
5007 /* We will happily ignore a trailing slash (or any redundant slashes) */
5008 if (path_equal(where
, canonical_where
))
5011 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
5012 log_unit_struct(u
, LOG_ERR
,
5013 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
5014 LOG_UNIT_INVOCATION_ID(u
),
5015 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
5021 bool unit_is_pristine(Unit
*u
) {
5024 /* Check if the unit already exists or is already around, in a number of different ways. Note that to
5025 * cater for unit types such as slice, we are generally fine with units that are marked UNIT_LOADED
5026 * even though nothing was actually loaded, as those unit types don't require a file on disk.
5028 * Note that we don't check for drop-ins here, because we allow drop-ins for transient units
5029 * identically to non-transient units, both unit-specific and hierarchical. E.g. for a-b-c.service:
5030 * service.d/….conf, a-.service.d/….conf, a-b-.service.d/….conf, a-b-c.service.d/….conf.
5033 return IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) &&
5034 !u
->fragment_path
&&
5040 pid_t
unit_control_pid(Unit
*u
) {
5043 if (UNIT_VTABLE(u
)->control_pid
)
5044 return UNIT_VTABLE(u
)->control_pid(u
);
5049 pid_t
unit_main_pid(Unit
*u
) {
5052 if (UNIT_VTABLE(u
)->main_pid
)
5053 return UNIT_VTABLE(u
)->main_pid(u
);
5058 static void unit_unref_uid_internal(
5062 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
5066 assert(_manager_unref_uid
);
5068 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
5069 * gid_t are actually the same time, with the same validity rules.
5071 * Drops a reference to UID/GID from a unit. */
5073 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5074 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5076 if (!uid_is_valid(*ref_uid
))
5079 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
5080 *ref_uid
= UID_INVALID
;
5083 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
5084 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
5087 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
5088 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
5091 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
5094 unit_unref_uid(u
, destroy_now
);
5095 unit_unref_gid(u
, destroy_now
);
5098 static int unit_ref_uid_internal(
5103 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
5109 assert(uid_is_valid(uid
));
5110 assert(_manager_ref_uid
);
5112 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
5113 * are actually the same type, and have the same validity rules.
5115 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
5116 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
5119 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5120 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5122 if (*ref_uid
== uid
)
5125 if (uid_is_valid(*ref_uid
)) /* Already set? */
5128 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
5136 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
5137 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
5140 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
5141 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
5144 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
5149 /* Reference both a UID and a GID in one go. Either references both, or neither. */
5151 if (uid_is_valid(uid
)) {
5152 r
= unit_ref_uid(u
, uid
, clean_ipc
);
5157 if (gid_is_valid(gid
)) {
5158 q
= unit_ref_gid(u
, gid
, clean_ipc
);
5161 unit_unref_uid(u
, false);
5167 return r
> 0 || q
> 0;
5170 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
5176 c
= unit_get_exec_context(u
);
5178 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
5180 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
5185 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
5190 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
5191 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
5192 * objects when no service references the UID/GID anymore. */
5194 r
= unit_ref_uid_gid(u
, uid
, gid
);
5196 unit_add_to_dbus_queue(u
);
5199 int unit_acquire_invocation_id(Unit
*u
) {
5205 r
= sd_id128_randomize(&id
);
5207 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
5209 r
= unit_set_invocation_id(u
, id
);
5211 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
5213 unit_add_to_dbus_queue(u
);
5217 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
5223 /* Copy parameters from manager */
5224 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
5228 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
5229 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
5230 p
->prefix
= u
->manager
->prefix
;
5231 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
5233 /* Copy parameters from unit */
5234 p
->cgroup_path
= u
->cgroup_path
;
5235 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
5237 p
->received_credentials_directory
= u
->manager
->received_credentials_directory
;
5238 p
->received_encrypted_credentials_directory
= u
->manager
->received_encrypted_credentials_directory
;
5243 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
5249 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5250 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5252 (void) unit_realize_cgroup(u
);
5254 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5258 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
);
5259 (void) ignore_signals(SIGPIPE
);
5261 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5263 if (u
->cgroup_path
) {
5264 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5266 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", empty_to_root(u
->cgroup_path
));
5274 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5281 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5285 int ret
= EXIT_SUCCESS
;
5287 STRV_FOREACH(i
, paths
) {
5288 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5290 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5298 r
= unit_watch_pid(u
, pid
, true);
5306 static void unit_update_dependency_mask(Hashmap
*deps
, Unit
*other
, UnitDependencyInfo di
) {
5310 if (di
.origin_mask
== 0 && di
.destination_mask
== 0)
5311 /* No bit set anymore, let's drop the whole entry */
5312 assert_se(hashmap_remove(deps
, other
));
5314 /* Mask was reduced, let's update the entry */
5315 assert_se(hashmap_update(deps
, other
, di
.data
) == 0);
5318 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5322 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5327 HASHMAP_FOREACH(deps
, u
->dependencies
) {
5331 UnitDependencyInfo di
;
5336 HASHMAP_FOREACH_KEY(di
.data
, other
, deps
) {
5337 Hashmap
*other_deps
;
5339 if (FLAGS_SET(~mask
, di
.origin_mask
))
5342 di
.origin_mask
&= ~mask
;
5343 unit_update_dependency_mask(deps
, other
, di
);
5345 /* We updated the dependency from our unit to the other unit now. But most
5346 * dependencies imply a reverse dependency. Hence, let's delete that one
5347 * too. For that we go through all dependency types on the other unit and
5348 * delete all those which point to us and have the right mask set. */
5350 HASHMAP_FOREACH(other_deps
, other
->dependencies
) {
5351 UnitDependencyInfo dj
;
5353 dj
.data
= hashmap_get(other_deps
, u
);
5354 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5357 dj
.destination_mask
&= ~mask
;
5358 unit_update_dependency_mask(other_deps
, u
, dj
);
5361 unit_add_to_gc_queue(other
);
5363 /* The unit 'other' may not be wanted by the unit 'u'. */
5364 unit_submit_to_stop_when_unneeded_queue(other
);
5374 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5381 if (MANAGER_IS_SYSTEM(u
->manager
))
5382 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5384 _cleanup_free_
char *user_path
= NULL
;
5385 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5388 p
= strjoin(user_path
, u
->id
);
5398 static int unit_export_invocation_id(Unit
*u
) {
5399 _cleanup_free_
char *p
= NULL
;
5404 if (u
->exported_invocation_id
)
5407 if (sd_id128_is_null(u
->invocation_id
))
5410 r
= unit_get_invocation_path(u
, &p
);
5412 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5414 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5416 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5418 u
->exported_invocation_id
= true;
5422 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5430 if (u
->exported_log_level_max
)
5433 if (c
->log_level_max
< 0)
5436 assert(c
->log_level_max
<= 7);
5438 buf
[0] = '0' + c
->log_level_max
;
5441 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5442 r
= symlink_atomic(buf
, p
);
5444 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5446 u
->exported_log_level_max
= true;
5450 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5451 _cleanup_close_
int fd
= -EBADF
;
5452 struct iovec
*iovec
;
5459 if (u
->exported_log_extra_fields
)
5462 if (c
->n_log_extra_fields
<= 0)
5465 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5466 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5468 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5469 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5471 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5472 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5475 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5476 pattern
= strjoina(p
, ".XXXXXX");
5478 fd
= mkostemp_safe(pattern
);
5480 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5482 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5484 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5488 (void) fchmod(fd
, 0644);
5490 if (rename(pattern
, p
) < 0) {
5491 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5495 u
->exported_log_extra_fields
= true;
5499 (void) unlink(pattern
);
5503 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5504 _cleanup_free_
char *buf
= NULL
;
5511 if (u
->exported_log_ratelimit_interval
)
5514 if (c
->log_ratelimit_interval_usec
== 0)
5517 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5519 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5522 r
= symlink_atomic(buf
, p
);
5524 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5526 u
->exported_log_ratelimit_interval
= true;
5530 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5531 _cleanup_free_
char *buf
= NULL
;
5538 if (u
->exported_log_ratelimit_burst
)
5541 if (c
->log_ratelimit_burst
== 0)
5544 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5546 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5549 r
= symlink_atomic(buf
, p
);
5551 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5553 u
->exported_log_ratelimit_burst
= true;
5557 void unit_export_state_files(Unit
*u
) {
5558 const ExecContext
*c
;
5565 if (MANAGER_IS_TEST_RUN(u
->manager
))
5568 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5569 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5570 * the IPC system itself and PID 1 also log to the journal.
5572 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5573 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5574 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5575 * namespace at least.
5577 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5578 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5581 (void) unit_export_invocation_id(u
);
5583 if (!MANAGER_IS_SYSTEM(u
->manager
))
5586 c
= unit_get_exec_context(u
);
5588 (void) unit_export_log_level_max(u
, c
);
5589 (void) unit_export_log_extra_fields(u
, c
);
5590 (void) unit_export_log_ratelimit_interval(u
, c
);
5591 (void) unit_export_log_ratelimit_burst(u
, c
);
5595 void unit_unlink_state_files(Unit
*u
) {
5603 /* Undoes the effect of unit_export_state() */
5605 if (u
->exported_invocation_id
) {
5606 _cleanup_free_
char *invocation_path
= NULL
;
5607 int r
= unit_get_invocation_path(u
, &invocation_path
);
5609 (void) unlink(invocation_path
);
5610 u
->exported_invocation_id
= false;
5614 if (!MANAGER_IS_SYSTEM(u
->manager
))
5617 if (u
->exported_log_level_max
) {
5618 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5621 u
->exported_log_level_max
= false;
5624 if (u
->exported_log_extra_fields
) {
5625 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5628 u
->exported_log_extra_fields
= false;
5631 if (u
->exported_log_ratelimit_interval
) {
5632 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5635 u
->exported_log_ratelimit_interval
= false;
5638 if (u
->exported_log_ratelimit_burst
) {
5639 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5642 u
->exported_log_ratelimit_burst
= false;
5646 int unit_prepare_exec(Unit
*u
) {
5651 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5652 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5653 r
= bpf_firewall_load_custom(u
);
5657 /* Prepares everything so that we can fork of a process for this unit */
5659 (void) unit_realize_cgroup(u
);
5661 if (u
->reset_accounting
) {
5662 (void) unit_reset_accounting(u
);
5663 u
->reset_accounting
= false;
5666 unit_export_state_files(u
);
5668 r
= unit_setup_exec_runtime(u
);
5675 static bool ignore_leftover_process(const char *comm
) {
5676 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5679 int unit_log_leftover_process_start(pid_t pid
, int sig
, void *userdata
) {
5680 _cleanup_free_
char *comm
= NULL
;
5682 (void) get_process_comm(pid
, &comm
);
5684 if (ignore_leftover_process(comm
))
5687 /* During start we print a warning */
5689 log_unit_warning(userdata
,
5690 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5691 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5697 int unit_log_leftover_process_stop(pid_t pid
, int sig
, void *userdata
) {
5698 _cleanup_free_
char *comm
= NULL
;
5700 (void) get_process_comm(pid
, &comm
);
5702 if (ignore_leftover_process(comm
))
5705 /* During stop we only print an informational message */
5707 log_unit_info(userdata
,
5708 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
5714 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
5717 (void) unit_pick_cgroup_path(u
);
5719 if (!u
->cgroup_path
)
5722 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_func
, u
);
5725 bool unit_needs_console(Unit
*u
) {
5727 UnitActiveState state
;
5731 state
= unit_active_state(u
);
5733 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5736 if (UNIT_VTABLE(u
)->needs_console
)
5737 return UNIT_VTABLE(u
)->needs_console(u
);
5739 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5740 ec
= unit_get_exec_context(u
);
5744 return exec_context_may_touch_console(ec
);
5747 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5752 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5753 * and not a kernel thread either */
5755 /* First, a simple range check */
5756 if (!pid_is_valid(pid
))
5757 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5759 /* Some extra safety check */
5760 if (pid
== 1 || pid
== getpid_cached())
5761 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5763 /* Don't even begin to bother with kernel threads */
5764 r
= is_kernel_thread(pid
);
5766 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5768 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5770 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5775 void unit_log_success(Unit
*u
) {
5778 /* Let's show message "Deactivated successfully" in debug mode (when manager is user) rather than in info mode.
5779 * This message has low information value for regular users and it might be a bit overwhelming on a system with
5780 * a lot of devices. */
5782 MANAGER_IS_USER(u
->manager
) ? LOG_DEBUG
: LOG_INFO
,
5783 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5784 LOG_UNIT_INVOCATION_ID(u
),
5785 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
5788 void unit_log_failure(Unit
*u
, const char *result
) {
5792 log_unit_struct(u
, LOG_WARNING
,
5793 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5794 LOG_UNIT_INVOCATION_ID(u
),
5795 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5796 "UNIT_RESULT=%s", result
);
5799 void unit_log_skip(Unit
*u
, const char *result
) {
5803 log_unit_struct(u
, LOG_INFO
,
5804 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5805 LOG_UNIT_INVOCATION_ID(u
),
5806 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5807 "UNIT_RESULT=%s", result
);
5810 void unit_log_process_exit(
5813 const char *command
,
5823 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5824 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5825 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5829 else if (code
== CLD_EXITED
)
5832 level
= LOG_WARNING
;
5834 log_unit_struct(u
, level
,
5835 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5836 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s%s",
5838 sigchld_code_to_string(code
), status
,
5839 strna(code
== CLD_EXITED
5840 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5841 : signal_to_string(status
)),
5842 success
? " (success)" : ""),
5843 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5844 "EXIT_STATUS=%i", status
,
5845 "COMMAND=%s", strna(command
),
5846 LOG_UNIT_INVOCATION_ID(u
));
5849 int unit_exit_status(Unit
*u
) {
5852 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5853 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5854 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5855 * service process has exited abnormally (signal/coredump). */
5857 if (!UNIT_VTABLE(u
)->exit_status
)
5860 return UNIT_VTABLE(u
)->exit_status(u
);
5863 int unit_failure_action_exit_status(Unit
*u
) {
5868 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5870 if (u
->failure_action_exit_status
>= 0)
5871 return u
->failure_action_exit_status
;
5873 r
= unit_exit_status(u
);
5874 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5880 int unit_success_action_exit_status(Unit
*u
) {
5885 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5887 if (u
->success_action_exit_status
>= 0)
5888 return u
->success_action_exit_status
;
5890 r
= unit_exit_status(u
);
5891 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5897 int unit_test_trigger_loaded(Unit
*u
) {
5900 /* Tests whether the unit to trigger is loaded */
5902 trigger
= UNIT_TRIGGER(u
);
5904 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5905 "Refusing to start, no unit to trigger.");
5906 if (trigger
->load_state
!= UNIT_LOADED
)
5907 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5908 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
5913 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
5917 /* EXEC_PRESERVE_RESTART is handled via unit_release_resources()! */
5918 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
)
5919 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
5921 exec_context_destroy_credentials(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], u
->id
);
5922 exec_context_destroy_mount_ns_dir(u
);
5925 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
5926 UnitActiveState state
;
5930 /* Special return values:
5932 * -EOPNOTSUPP → cleaning not supported for this unit type
5933 * -EUNATCH → cleaning not defined for this resource type
5934 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
5935 * a job queued or similar
5938 if (!UNIT_VTABLE(u
)->clean
)
5944 if (u
->load_state
!= UNIT_LOADED
)
5950 state
= unit_active_state(u
);
5951 if (state
!= UNIT_INACTIVE
)
5954 return UNIT_VTABLE(u
)->clean(u
, mask
);
5957 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
5960 if (!UNIT_VTABLE(u
)->clean
||
5961 u
->load_state
!= UNIT_LOADED
) {
5966 /* When the clean() method is set, can_clean() really should be set too */
5967 assert(UNIT_VTABLE(u
)->can_clean
);
5969 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
5972 bool unit_can_freeze(Unit
*u
) {
5975 if (UNIT_VTABLE(u
)->can_freeze
)
5976 return UNIT_VTABLE(u
)->can_freeze(u
);
5978 return UNIT_VTABLE(u
)->freeze
;
5981 void unit_frozen(Unit
*u
) {
5984 u
->freezer_state
= FREEZER_FROZEN
;
5986 bus_unit_send_pending_freezer_message(u
, false);
5989 void unit_thawed(Unit
*u
) {
5992 u
->freezer_state
= FREEZER_RUNNING
;
5994 bus_unit_send_pending_freezer_message(u
, false);
5997 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
5999 int (*method
)(Unit
*);
6003 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
6005 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
6006 if (!method
|| !cg_freezer_supported())
6012 if (u
->load_state
!= UNIT_LOADED
)
6015 s
= unit_active_state(u
);
6016 if (s
!= UNIT_ACTIVE
)
6019 if ((IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
) && action
== FREEZER_FREEZE
) ||
6020 (u
->freezer_state
== FREEZER_THAWING
&& action
== FREEZER_THAW
))
6027 assert(IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
));
6032 int unit_freeze(Unit
*u
) {
6033 return unit_freezer_action(u
, FREEZER_FREEZE
);
6036 int unit_thaw(Unit
*u
) {
6037 return unit_freezer_action(u
, FREEZER_THAW
);
6040 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
6041 int unit_freeze_vtable_common(Unit
*u
) {
6042 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
6045 int unit_thaw_vtable_common(Unit
*u
) {
6046 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
6049 Condition
*unit_find_failed_condition(Unit
*u
) {
6050 Condition
*failed_trigger
= NULL
;
6051 bool has_succeeded_trigger
= false;
6053 if (u
->condition_result
)
6056 LIST_FOREACH(conditions
, c
, u
->conditions
)
6058 if (c
->result
== CONDITION_SUCCEEDED
)
6059 has_succeeded_trigger
= true;
6060 else if (!failed_trigger
)
6062 } else if (c
->result
!= CONDITION_SUCCEEDED
)
6065 return failed_trigger
&& !has_succeeded_trigger
? failed_trigger
: NULL
;
6068 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
6069 [COLLECT_INACTIVE
] = "inactive",
6070 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
6073 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);
6075 Unit
* unit_has_dependency(const Unit
*u
, UnitDependencyAtom atom
, Unit
*other
) {
6080 /* Checks if the unit has a dependency on 'other' with the specified dependency atom. If 'other' is
6081 * NULL checks if the unit has *any* dependency of that atom. Returns 'other' if found (or if 'other'
6082 * is NULL the first entry found), or NULL if not found. */
6084 UNIT_FOREACH_DEPENDENCY(i
, u
, atom
)
6085 if (!other
|| other
== i
)
6091 int unit_get_dependency_array(const Unit
*u
, UnitDependencyAtom atom
, Unit
***ret_array
) {
6092 _cleanup_free_ Unit
**array
= NULL
;
6099 /* Gets a list of units matching a specific atom as array. This is useful when iterating through
6100 * dependencies while modifying them: the array is an "atomic snapshot" of sorts, that can be read
6101 * while the dependency table is continuously updated. */
6103 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
6104 if (!GREEDY_REALLOC(array
, n
+ 1))
6110 *ret_array
= TAKE_PTR(array
);
6112 assert(n
<= INT_MAX
);
6116 const ActivationDetailsVTable
* const activation_details_vtable
[_UNIT_TYPE_MAX
] = {
6117 [UNIT_PATH
] = &activation_details_path_vtable
,
6118 [UNIT_TIMER
] = &activation_details_timer_vtable
,
6121 ActivationDetails
*activation_details_new(Unit
*trigger_unit
) {
6122 _cleanup_free_ ActivationDetails
*details
= NULL
;
6124 assert(trigger_unit
);
6125 assert(trigger_unit
->type
!= _UNIT_TYPE_INVALID
);
6126 assert(trigger_unit
->id
);
6128 details
= malloc0(activation_details_vtable
[trigger_unit
->type
]->object_size
);
6132 *details
= (ActivationDetails
) {
6134 .trigger_unit_type
= trigger_unit
->type
,
6137 details
->trigger_unit_name
= strdup(trigger_unit
->id
);
6138 if (!details
->trigger_unit_name
)
6141 if (ACTIVATION_DETAILS_VTABLE(details
)->init
)
6142 ACTIVATION_DETAILS_VTABLE(details
)->init(details
, trigger_unit
);
6144 return TAKE_PTR(details
);
6147 static ActivationDetails
*activation_details_free(ActivationDetails
*details
) {
6151 if (ACTIVATION_DETAILS_VTABLE(details
)->done
)
6152 ACTIVATION_DETAILS_VTABLE(details
)->done(details
);
6154 free(details
->trigger_unit_name
);
6156 return mfree(details
);
6159 void activation_details_serialize(ActivationDetails
*details
, FILE *f
) {
6160 if (!details
|| details
->trigger_unit_type
== _UNIT_TYPE_INVALID
)
6163 (void) serialize_item(f
, "activation-details-unit-type", unit_type_to_string(details
->trigger_unit_type
));
6164 if (details
->trigger_unit_name
)
6165 (void) serialize_item(f
, "activation-details-unit-name", details
->trigger_unit_name
);
6166 if (ACTIVATION_DETAILS_VTABLE(details
)->serialize
)
6167 ACTIVATION_DETAILS_VTABLE(details
)->serialize(details
, f
);
6170 int activation_details_deserialize(const char *key
, const char *value
, ActivationDetails
**details
) {
6180 if (!streq(key
, "activation-details-unit-type"))
6183 t
= unit_type_from_string(value
);
6187 /* The activation details vtable has defined ops only for path and timer units */
6188 if (!activation_details_vtable
[t
])
6191 *details
= malloc0(activation_details_vtable
[t
]->object_size
);
6195 **details
= (ActivationDetails
) {
6197 .trigger_unit_type
= t
,
6203 if (streq(key
, "activation-details-unit-name")) {
6204 r
= free_and_strdup(&(*details
)->trigger_unit_name
, value
);
6211 if (ACTIVATION_DETAILS_VTABLE(*details
)->deserialize
)
6212 return ACTIVATION_DETAILS_VTABLE(*details
)->deserialize(key
, value
, details
);
6217 int activation_details_append_env(ActivationDetails
*details
, char ***strv
) {
6225 if (!isempty(details
->trigger_unit_name
)) {
6226 char *s
= strjoin("TRIGGER_UNIT=", details
->trigger_unit_name
);
6230 r
= strv_consume(strv
, TAKE_PTR(s
));
6235 if (ACTIVATION_DETAILS_VTABLE(details
)->append_env
) {
6236 r
= ACTIVATION_DETAILS_VTABLE(details
)->append_env(details
, strv
);
6241 return r
+ !isempty(details
->trigger_unit_name
); /* Return the number of variables added to the env block */
6244 int activation_details_append_pair(ActivationDetails
*details
, char ***strv
) {
6252 if (!isempty(details
->trigger_unit_name
)) {
6253 r
= strv_extend(strv
, "trigger_unit");
6257 r
= strv_extend(strv
, details
->trigger_unit_name
);
6262 if (ACTIVATION_DETAILS_VTABLE(details
)->append_env
) {
6263 r
= ACTIVATION_DETAILS_VTABLE(details
)->append_pair(details
, strv
);
6268 return r
+ !isempty(details
->trigger_unit_name
); /* Return the number of pairs added to the strv */
6271 DEFINE_TRIVIAL_REF_UNREF_FUNC(ActivationDetails
, activation_details
, activation_details_free
);