1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
9 #include "sd-messages.h"
11 #include "all-units.h"
12 #include "alloc-util.h"
13 #include "bpf-firewall.h"
14 #include "bpf-foreign.h"
15 #include "bpf-socket-bind.h"
16 #include "bus-common-errors.h"
17 #include "bus-internal.h"
19 #include "cgroup-setup.h"
20 #include "cgroup-util.h"
22 #include "core-varlink.h"
23 #include "dbus-unit.h"
30 #include "fileio-label.h"
32 #include "format-util.h"
33 #include "id128-util.h"
36 #include "label-util.h"
37 #include "load-dropin.h"
38 #include "load-fragment.h"
40 #include "logarithm.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 we saw a cgroup empty event for this unit, stay around until we processed it so that we remove
445 * the empty cgroup if possible. Similar, process any pending OOM events if they are already queued
446 * before we release the unit. */
447 if (u
->in_cgroup_empty_queue
|| u
->in_cgroup_oom_queue
)
450 /* Make sure to send out D-Bus events before we unload the unit */
451 if (u
->in_dbus_queue
)
454 if (sd_bus_track_count(u
->bus_track
) > 0)
457 state
= unit_active_state(u
);
459 /* But we keep the unit object around for longer when it is referenced or configured to not be
461 switch (u
->collect_mode
) {
463 case COLLECT_INACTIVE
:
464 if (state
!= UNIT_INACTIVE
)
469 case COLLECT_INACTIVE_OR_FAILED
:
470 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
476 assert_not_reached();
479 /* Check if any OnFailure= or on Success= jobs may be pending */
480 if (unit_success_failure_handler_has_jobs(u
))
483 if (u
->cgroup_path
) {
484 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
485 * around. Units with active processes should never be collected. */
487 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
489 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", empty_to_root(u
->cgroup_path
));
494 if (!UNIT_VTABLE(u
)->may_gc
)
497 return UNIT_VTABLE(u
)->may_gc(u
);
500 void unit_add_to_load_queue(Unit
*u
) {
502 assert(u
->type
!= _UNIT_TYPE_INVALID
);
504 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
507 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
508 u
->in_load_queue
= true;
511 void unit_add_to_cleanup_queue(Unit
*u
) {
514 if (u
->in_cleanup_queue
)
517 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
518 u
->in_cleanup_queue
= true;
521 void unit_add_to_gc_queue(Unit
*u
) {
524 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
530 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
531 u
->in_gc_queue
= true;
534 void unit_add_to_dbus_queue(Unit
*u
) {
536 assert(u
->type
!= _UNIT_TYPE_INVALID
);
538 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
541 /* Shortcut things if nobody cares */
542 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
543 sd_bus_track_count(u
->bus_track
) <= 0 &&
544 set_isempty(u
->manager
->private_buses
)) {
545 u
->sent_dbus_new_signal
= true;
549 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
550 u
->in_dbus_queue
= true;
553 void unit_submit_to_stop_when_unneeded_queue(Unit
*u
) {
556 if (u
->in_stop_when_unneeded_queue
)
559 if (!u
->stop_when_unneeded
)
562 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
565 LIST_PREPEND(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
566 u
->in_stop_when_unneeded_queue
= true;
569 void unit_submit_to_start_when_upheld_queue(Unit
*u
) {
572 if (u
->in_start_when_upheld_queue
)
575 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)))
578 if (!unit_has_dependency(u
, UNIT_ATOM_START_STEADILY
, NULL
))
581 LIST_PREPEND(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
582 u
->in_start_when_upheld_queue
= true;
585 void unit_submit_to_stop_when_bound_queue(Unit
*u
) {
588 if (u
->in_stop_when_bound_queue
)
591 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
594 if (!unit_has_dependency(u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
, NULL
))
597 LIST_PREPEND(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
598 u
->in_stop_when_bound_queue
= true;
601 static bool unit_can_release_resources(Unit
*u
) {
606 if (UNIT_VTABLE(u
)->release_resources
)
609 ec
= unit_get_exec_context(u
);
610 if (ec
&& ec
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
)
616 void unit_submit_to_release_resources_queue(Unit
*u
) {
619 if (u
->in_release_resources_queue
)
622 if (u
->job
|| u
->nop_job
)
628 if (!unit_can_release_resources(u
))
631 LIST_PREPEND(release_resources_queue
, u
->manager
->release_resources_queue
, u
);
632 u
->in_release_resources_queue
= true;
635 static void unit_clear_dependencies(Unit
*u
) {
638 /* Removes all dependencies configured on u and their reverse dependencies. */
640 for (Hashmap
*deps
; (deps
= hashmap_steal_first(u
->dependencies
));) {
642 for (Unit
*other
; (other
= hashmap_steal_first_key(deps
));) {
645 HASHMAP_FOREACH(other_deps
, other
->dependencies
)
646 hashmap_remove(other_deps
, u
);
648 unit_add_to_gc_queue(other
);
654 u
->dependencies
= hashmap_free(u
->dependencies
);
657 static void unit_remove_transient(Unit
*u
) {
663 if (u
->fragment_path
)
664 (void) unlink(u
->fragment_path
);
666 STRV_FOREACH(i
, u
->dropin_paths
) {
667 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
669 if (path_extract_directory(*i
, &p
) < 0) /* Get the drop-in directory from the drop-in file */
672 if (path_extract_directory(p
, &pp
) < 0) /* Get the config directory from the drop-in directory */
675 /* Only drop transient drop-ins */
676 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
684 static void unit_free_requires_mounts_for(Unit
*u
) {
688 _cleanup_free_
char *path
= NULL
;
690 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
694 char s
[strlen(path
) + 1];
696 PATH_FOREACH_PREFIX_MORE(s
, path
) {
700 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
704 (void) set_remove(x
, u
);
706 if (set_isempty(x
)) {
707 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
715 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
718 static void unit_done(Unit
*u
) {
727 if (UNIT_VTABLE(u
)->done
)
728 UNIT_VTABLE(u
)->done(u
);
730 ec
= unit_get_exec_context(u
);
732 exec_context_done(ec
);
734 cc
= unit_get_cgroup_context(u
);
736 cgroup_context_done(cc
);
739 Unit
* unit_free(Unit
*u
) {
746 sd_event_source_disable_unref(u
->auto_start_stop_event_source
);
748 u
->transient_file
= safe_fclose(u
->transient_file
);
750 if (!MANAGER_IS_RELOADING(u
->manager
))
751 unit_remove_transient(u
);
753 bus_unit_send_removed_signal(u
);
757 unit_dequeue_rewatch_pids(u
);
759 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
760 u
->bus_track
= sd_bus_track_unref(u
->bus_track
);
761 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
762 u
->pending_freezer_invocation
= sd_bus_message_unref(u
->pending_freezer_invocation
);
764 unit_free_requires_mounts_for(u
);
766 SET_FOREACH(t
, u
->aliases
)
767 hashmap_remove_value(u
->manager
->units
, t
, u
);
769 hashmap_remove_value(u
->manager
->units
, u
->id
, u
);
771 if (!sd_id128_is_null(u
->invocation_id
))
772 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
786 /* A unit is being dropped from the tree, make sure our family is realized properly. Do this after we
787 * detach the unit from slice tree in order to eliminate its effect on controller masks. */
788 slice
= UNIT_GET_SLICE(u
);
789 unit_clear_dependencies(u
);
791 unit_add_family_to_cgroup_realize_queue(slice
);
794 manager_unref_console(u
->manager
);
796 fdset_free(u
->initial_socket_bind_link_fds
);
798 bpf_link_free(u
->ipv4_socket_bind_link
);
799 bpf_link_free(u
->ipv6_socket_bind_link
);
802 unit_release_cgroup(u
);
804 if (!MANAGER_IS_RELOADING(u
->manager
))
805 unit_unlink_state_files(u
);
807 unit_unref_uid_gid(u
, false);
809 (void) manager_update_failed_units(u
->manager
, u
, false);
810 set_remove(u
->manager
->startup_units
, u
);
812 unit_unwatch_all_pids(u
);
814 while (u
->refs_by_target
)
815 unit_ref_unset(u
->refs_by_target
);
817 if (u
->type
!= _UNIT_TYPE_INVALID
)
818 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
820 if (u
->in_load_queue
)
821 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
823 if (u
->in_dbus_queue
)
824 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
826 if (u
->in_cleanup_queue
)
827 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
830 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
832 if (u
->in_cgroup_realize_queue
)
833 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
835 if (u
->in_cgroup_empty_queue
)
836 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
838 if (u
->in_cgroup_oom_queue
)
839 LIST_REMOVE(cgroup_oom_queue
, u
->manager
->cgroup_oom_queue
, u
);
841 if (u
->in_target_deps_queue
)
842 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
844 if (u
->in_stop_when_unneeded_queue
)
845 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
847 if (u
->in_start_when_upheld_queue
)
848 LIST_REMOVE(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
850 if (u
->in_stop_when_bound_queue
)
851 LIST_REMOVE(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
853 if (u
->in_release_resources_queue
)
854 LIST_REMOVE(release_resources_queue
, u
->manager
->release_resources_queue
, u
);
856 bpf_firewall_close(u
);
858 hashmap_free(u
->bpf_foreign_by_key
);
860 bpf_program_free(u
->bpf_device_control_installed
);
863 bpf_link_free(u
->restrict_ifaces_ingress_bpf_link
);
864 bpf_link_free(u
->restrict_ifaces_egress_bpf_link
);
866 fdset_free(u
->initial_restric_ifaces_link_fds
);
868 condition_free_list(u
->conditions
);
869 condition_free_list(u
->asserts
);
871 free(u
->description
);
872 strv_free(u
->documentation
);
873 free(u
->fragment_path
);
874 free(u
->source_path
);
875 strv_free(u
->dropin_paths
);
878 free(u
->job_timeout_reboot_arg
);
881 free(u
->access_selinux_context
);
883 set_free_free(u
->aliases
);
886 activation_details_unref(u
->activation_details
);
891 FreezerState
unit_freezer_state(Unit
*u
) {
894 return u
->freezer_state
;
897 int unit_freezer_state_kernel(Unit
*u
, FreezerState
*ret
) {
898 char *values
[1] = {};
903 r
= cg_get_keyed_attribute(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events",
904 STRV_MAKE("frozen"), values
);
908 r
= _FREEZER_STATE_INVALID
;
911 if (streq(values
[0], "0"))
913 else if (streq(values
[0], "1"))
923 UnitActiveState
unit_active_state(Unit
*u
) {
926 if (u
->load_state
== UNIT_MERGED
)
927 return unit_active_state(unit_follow_merge(u
));
929 /* After a reload it might happen that a unit is not correctly
930 * loaded but still has a process around. That's why we won't
931 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
933 return UNIT_VTABLE(u
)->active_state(u
);
936 const char* unit_sub_state_to_string(Unit
*u
) {
939 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
942 static int unit_merge_names(Unit
*u
, Unit
*other
) {
949 r
= unit_add_alias(u
, other
->id
);
953 r
= set_move(u
->aliases
, other
->aliases
);
955 set_remove(u
->aliases
, other
->id
);
960 other
->aliases
= set_free_free(other
->aliases
);
962 SET_FOREACH(name
, u
->aliases
)
963 assert_se(hashmap_replace(u
->manager
->units
, name
, u
) == 0);
968 static int unit_reserve_dependencies(Unit
*u
, Unit
*other
) {
977 /* Let's reserve some space in the dependency hashmaps so that later on merging the units cannot
980 * First make some room in the per dependency type hashmaps. Using the summed size of both units'
981 * hashmaps is an estimate that is likely too high since they probably use some of the same
982 * types. But it's never too low, and that's all we need. */
984 n_reserve
= MIN(hashmap_size(other
->dependencies
), LESS_BY((size_t) _UNIT_DEPENDENCY_MAX
, hashmap_size(u
->dependencies
)));
986 r
= hashmap_ensure_allocated(&u
->dependencies
, NULL
);
990 r
= hashmap_reserve(u
->dependencies
, n_reserve
);
995 /* Now, enlarge our per dependency type hashmaps by the number of entries in the same hashmap of the
996 * other unit's dependencies.
998 * NB: If u does not have a dependency set allocated for some dependency type, there is no need to
999 * reserve anything for. In that case other's set will be transferred as a whole to u by
1000 * complete_move(). */
1002 HASHMAP_FOREACH_KEY(deps
, d
, u
->dependencies
) {
1003 Hashmap
*other_deps
;
1005 other_deps
= hashmap_get(other
->dependencies
, d
);
1007 r
= hashmap_reserve(deps
, hashmap_size(other_deps
));
1015 static bool unit_should_warn_about_dependency(UnitDependency dependency
) {
1016 /* Only warn about some unit types */
1017 return IN_SET(dependency
,
1028 static int unit_per_dependency_type_hashmap_update(
1031 UnitDependencyMask origin_mask
,
1032 UnitDependencyMask destination_mask
) {
1034 UnitDependencyInfo info
;
1038 assert_cc(sizeof(void*) == sizeof(info
));
1040 /* Acquire the UnitDependencyInfo entry for the Unit* we are interested in, and update it if it
1041 * exists, or insert it anew if not. */
1043 info
.data
= hashmap_get(per_type
, other
);
1045 /* Entry already exists. Add in our mask. */
1047 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
1048 FLAGS_SET(destination_mask
, info
.destination_mask
))
1051 info
.origin_mask
|= origin_mask
;
1052 info
.destination_mask
|= destination_mask
;
1054 r
= hashmap_update(per_type
, other
, info
.data
);
1056 info
= (UnitDependencyInfo
) {
1057 .origin_mask
= origin_mask
,
1058 .destination_mask
= destination_mask
,
1061 r
= hashmap_put(per_type
, other
, info
.data
);
1069 static void unit_merge_dependencies(Unit
*u
, Unit
*other
) {
1071 void *dt
; /* Actually of type UnitDependency, except that we don't bother casting it here,
1072 * since the hashmaps all want it as void pointer. */
1080 /* First, remove dependency to other. */
1081 HASHMAP_FOREACH_KEY(deps
, dt
, u
->dependencies
) {
1082 if (hashmap_remove(deps
, other
) && unit_should_warn_about_dependency(UNIT_DEPENDENCY_FROM_PTR(dt
)))
1083 log_unit_warning(u
, "Dependency %s=%s is dropped, as %s is merged into %s.",
1084 unit_dependency_to_string(UNIT_DEPENDENCY_FROM_PTR(dt
)),
1085 other
->id
, other
->id
, u
->id
);
1087 if (hashmap_isempty(deps
))
1088 hashmap_free(hashmap_remove(u
->dependencies
, dt
));
1092 _cleanup_hashmap_free_ Hashmap
*other_deps
= NULL
;
1093 UnitDependencyInfo di_back
;
1096 /* Let's focus on one dependency type at a time, that 'other' has defined. */
1097 other_deps
= hashmap_steal_first_key_and_value(other
->dependencies
, &dt
);
1101 deps
= hashmap_get(u
->dependencies
, dt
);
1103 /* Now iterate through all dependencies of this dependency type, of 'other'. We refer to the
1104 * referenced units as 'back'. */
1105 HASHMAP_FOREACH_KEY(di_back
.data
, back
, other_deps
) {
1110 /* This is a dependency pointing back to the unit we want to merge with?
1111 * Suppress it (but warn) */
1112 if (unit_should_warn_about_dependency(UNIT_DEPENDENCY_FROM_PTR(dt
)))
1113 log_unit_warning(u
, "Dependency %s=%s in %s is dropped, as %s is merged into %s.",
1114 unit_dependency_to_string(UNIT_DEPENDENCY_FROM_PTR(dt
)),
1115 u
->id
, other
->id
, other
->id
, u
->id
);
1117 hashmap_remove(other_deps
, back
);
1121 /* Now iterate through all deps of 'back', and fix the ones pointing to 'other' to
1122 * point to 'u' instead. */
1123 HASHMAP_FOREACH_KEY(back_deps
, back_dt
, back
->dependencies
) {
1124 UnitDependencyInfo di_move
;
1126 di_move
.data
= hashmap_remove(back_deps
, other
);
1130 assert_se(unit_per_dependency_type_hashmap_update(
1133 di_move
.origin_mask
,
1134 di_move
.destination_mask
) >= 0);
1137 /* The target unit already has dependencies of this type, let's then merge this individually. */
1139 assert_se(unit_per_dependency_type_hashmap_update(
1142 di_back
.origin_mask
,
1143 di_back
.destination_mask
) >= 0);
1146 /* Now all references towards 'other' of the current type 'dt' are corrected to point to 'u'.
1147 * Lets's now move the deps of type 'dt' from 'other' to 'u'. If the unit does not have
1148 * dependencies of this type, let's move them per type wholesale. */
1150 assert_se(hashmap_put(u
->dependencies
, dt
, TAKE_PTR(other_deps
)) >= 0);
1153 other
->dependencies
= hashmap_free(other
->dependencies
);
1156 int unit_merge(Unit
*u
, Unit
*other
) {
1161 assert(u
->manager
== other
->manager
);
1162 assert(u
->type
!= _UNIT_TYPE_INVALID
);
1164 other
= unit_follow_merge(other
);
1169 if (u
->type
!= other
->type
)
1172 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
1175 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
1178 if (!streq_ptr(u
->instance
, other
->instance
))
1187 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1190 /* Make reservations to ensure merge_dependencies() won't fail. We don't rollback reservations if we
1191 * fail. We don't have a way to undo reservations. A reservation is not a leak. */
1192 r
= unit_reserve_dependencies(u
, other
);
1196 /* Redirect all references */
1197 while (other
->refs_by_target
)
1198 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
1200 /* Merge dependencies */
1201 unit_merge_dependencies(u
, other
);
1203 /* Merge names. It is better to do that after merging deps, otherwise the log message contains n/a. */
1204 r
= unit_merge_names(u
, other
);
1208 other
->load_state
= UNIT_MERGED
;
1209 other
->merged_into
= u
;
1211 if (!u
->activation_details
)
1212 u
->activation_details
= activation_details_ref(other
->activation_details
);
1214 /* If there is still some data attached to the other node, we
1215 * don't need it anymore, and can free it. */
1216 if (other
->load_state
!= UNIT_STUB
)
1217 if (UNIT_VTABLE(other
)->done
)
1218 UNIT_VTABLE(other
)->done(other
);
1220 unit_add_to_dbus_queue(u
);
1221 unit_add_to_cleanup_queue(other
);
1226 int unit_merge_by_name(Unit
*u
, const char *name
) {
1227 _cleanup_free_
char *s
= NULL
;
1231 /* Either add name to u, or if a unit with name already exists, merge it with u.
1232 * If name is a template, do the same for name@instance, where instance is u's instance. */
1237 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
1241 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
1248 other
= manager_get_unit(u
->manager
, name
);
1250 return unit_merge(u
, other
);
1252 return unit_add_name(u
, name
);
1255 Unit
* unit_follow_merge(Unit
*u
) {
1258 while (u
->load_state
== UNIT_MERGED
)
1259 assert_se(u
= u
->merged_into
);
1264 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
1270 /* Unlike unit_add_dependency() or friends, this always returns 0 on success. */
1272 if (c
->working_directory
&& !c
->working_directory_missing_ok
) {
1273 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
1278 if (c
->root_directory
) {
1279 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
1284 if (c
->root_image
) {
1285 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
1290 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
1291 if (!u
->manager
->prefix
[dt
])
1294 for (size_t i
= 0; i
< c
->directories
[dt
].n_items
; i
++) {
1295 _cleanup_free_
char *p
= NULL
;
1297 p
= path_join(u
->manager
->prefix
[dt
], c
->directories
[dt
].items
[i
].path
);
1301 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1307 if (!MANAGER_IS_SYSTEM(u
->manager
))
1310 /* For the following three directory types we need write access, and /var/ is possibly on the root
1311 * fs. Hence order after systemd-remount-fs.service, to ensure things are writable. */
1312 if (c
->directories
[EXEC_DIRECTORY_STATE
].n_items
> 0 ||
1313 c
->directories
[EXEC_DIRECTORY_CACHE
].n_items
> 0 ||
1314 c
->directories
[EXEC_DIRECTORY_LOGS
].n_items
> 0) {
1315 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_REMOUNT_FS_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1320 if (c
->private_tmp
) {
1322 /* FIXME: for now we make a special case for /tmp and add a weak dependency on
1323 * tmp.mount so /tmp being masked is supported. However there's no reason to treat
1324 * /tmp specifically and masking other mount units should be handled more
1325 * gracefully too, see PR#16894. */
1326 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "tmp.mount", true, UNIT_DEPENDENCY_FILE
);
1330 r
= unit_require_mounts_for(u
, "/var/tmp", UNIT_DEPENDENCY_FILE
);
1334 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1339 if (c
->root_image
) {
1340 /* We need to wait for /dev/loopX to appear when doing RootImage=, hence let's add an
1341 * implicit dependency on udev */
1343 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_UDEVD_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1348 if (!IN_SET(c
->std_output
,
1349 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1350 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1351 !IN_SET(c
->std_error
,
1352 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1353 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1357 /* If syslog or kernel logging is requested (or log namespacing is), make sure our own logging daemon
1360 if (c
->log_namespace
) {
1361 _cleanup_free_
char *socket_unit
= NULL
, *varlink_socket_unit
= NULL
;
1363 r
= unit_name_build_from_type("systemd-journald", c
->log_namespace
, UNIT_SOCKET
, &socket_unit
);
1367 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1371 r
= unit_name_build_from_type("systemd-journald-varlink", c
->log_namespace
, UNIT_SOCKET
, &varlink_socket_unit
);
1375 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, varlink_socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1379 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1383 if (exec_context_has_credentials(c
) && u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]) {
1384 _cleanup_free_
char *p
= NULL
, *m
= NULL
;
1386 /* Let's make sure the credentials directory of this service is unmounted *after* the service
1387 * itself shuts down. This only matters if mount namespacing is not used for the service, and
1388 * hence the credentials mount appears on the host. */
1390 p
= path_join(u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], "credentials", u
->id
);
1394 r
= unit_name_from_path(p
, ".mount", &m
);
1398 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, m
, /* add_reference= */ true, UNIT_DEPENDENCY_FILE
);
1406 const char* unit_description(Unit
*u
) {
1410 return u
->description
;
1412 return strna(u
->id
);
1415 const char* unit_status_string(Unit
*u
, char **ret_combined_buffer
) {
1419 /* Return u->id, u->description, or "{u->id} - {u->description}".
1420 * Versions with u->description are only used if it is set.
1421 * The last option is used if configured and the caller provided the 'ret_combined_buffer'
1424 * Note that *ret_combined_buffer may be set to NULL. */
1426 if (!u
->description
||
1427 u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
||
1428 (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& !ret_combined_buffer
) ||
1429 streq(u
->description
, u
->id
)) {
1431 if (ret_combined_buffer
)
1432 *ret_combined_buffer
= NULL
;
1436 if (ret_combined_buffer
) {
1437 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
) {
1438 *ret_combined_buffer
= strjoin(u
->id
, " - ", u
->description
);
1439 if (*ret_combined_buffer
)
1440 return *ret_combined_buffer
;
1441 log_oom(); /* Fall back to ->description */
1443 *ret_combined_buffer
= NULL
;
1446 return u
->description
;
1449 /* Common implementation for multiple backends */
1450 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1455 /* Load a .{service,socket,...} file */
1456 r
= unit_load_fragment(u
);
1460 if (u
->load_state
== UNIT_STUB
) {
1461 if (fragment_required
)
1464 u
->load_state
= UNIT_LOADED
;
1467 /* Load drop-in directory data. If u is an alias, we might be reloading the
1468 * target unit needlessly. But we cannot be sure which drops-ins have already
1469 * been loaded and which not, at least without doing complicated book-keeping,
1470 * so let's always reread all drop-ins. */
1471 r
= unit_load_dropin(unit_follow_merge(u
));
1475 if (u
->source_path
) {
1478 if (stat(u
->source_path
, &st
) >= 0)
1479 u
->source_mtime
= timespec_load(&st
.st_mtim
);
1481 u
->source_mtime
= 0;
1487 void unit_add_to_target_deps_queue(Unit
*u
) {
1488 Manager
*m
= ASSERT_PTR(ASSERT_PTR(u
)->manager
);
1490 if (u
->in_target_deps_queue
)
1493 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1494 u
->in_target_deps_queue
= true;
1497 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1501 if (target
->type
!= UNIT_TARGET
)
1504 /* Only add the dependency if both units are loaded, so that
1505 * that loop check below is reliable */
1506 if (u
->load_state
!= UNIT_LOADED
||
1507 target
->load_state
!= UNIT_LOADED
)
1510 /* If either side wants no automatic dependencies, then let's
1512 if (!u
->default_dependencies
||
1513 !target
->default_dependencies
)
1516 /* Don't create loops */
1517 if (unit_has_dependency(target
, UNIT_ATOM_BEFORE
, u
))
1520 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1523 static int unit_add_slice_dependencies(Unit
*u
) {
1527 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1530 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1531 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1533 UnitDependencyMask mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1535 slice
= UNIT_GET_SLICE(u
);
1537 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, slice
, true, mask
);
1539 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1542 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1545 static int unit_add_mount_dependencies(Unit
*u
) {
1546 UnitDependencyInfo di
;
1548 bool changed
= false;
1553 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
) {
1554 char prefix
[strlen(path
) + 1];
1556 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1557 _cleanup_free_
char *p
= NULL
;
1560 r
= unit_name_from_path(prefix
, ".mount", &p
);
1562 continue; /* If the path cannot be converted to a mount unit name, then it's
1563 * not manageable as a unit by systemd, and hence we don't need a
1564 * dependency on it. Let's thus silently ignore the issue. */
1568 m
= manager_get_unit(u
->manager
, p
);
1570 /* Make sure to load the mount unit if it exists. If so the dependencies on
1571 * this unit will be added later during the loading of the mount unit. */
1572 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1578 if (m
->load_state
!= UNIT_LOADED
)
1581 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1584 changed
= changed
|| r
> 0;
1586 if (m
->fragment_path
) {
1587 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1590 changed
= changed
|| r
> 0;
1598 static int unit_add_oomd_dependencies(Unit
*u
) {
1605 if (!u
->default_dependencies
)
1608 c
= unit_get_cgroup_context(u
);
1612 bool wants_oomd
= c
->moom_swap
== MANAGED_OOM_KILL
|| c
->moom_mem_pressure
== MANAGED_OOM_KILL
;
1616 if (!cg_all_unified())
1619 r
= cg_mask_supported(&mask
);
1621 return log_debug_errno(r
, "Failed to determine supported controllers: %m");
1623 if (!FLAGS_SET(mask
, CGROUP_MASK_MEMORY
))
1626 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "systemd-oomd.service", true, UNIT_DEPENDENCY_FILE
);
1629 static int unit_add_startup_units(Unit
*u
) {
1630 if (!unit_has_startup_cgroup_constraints(u
))
1633 return set_ensure_put(&u
->manager
->startup_units
, NULL
, u
);
1636 static int unit_validate_on_failure_job_mode(
1638 const char *job_mode_setting
,
1640 const char *dependency_name
,
1641 UnitDependencyAtom atom
) {
1643 Unit
*other
, *found
= NULL
;
1645 if (job_mode
!= JOB_ISOLATE
)
1648 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
1651 else if (found
!= other
)
1652 return log_unit_error_errno(
1653 u
, SYNTHETIC_ERRNO(ENOEXEC
),
1654 "More than one %s dependencies specified but %sisolate set. Refusing.",
1655 dependency_name
, job_mode_setting
);
1661 int unit_load(Unit
*u
) {
1666 if (u
->in_load_queue
) {
1667 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1668 u
->in_load_queue
= false;
1671 if (u
->type
== _UNIT_TYPE_INVALID
)
1674 if (u
->load_state
!= UNIT_STUB
)
1677 if (u
->transient_file
) {
1678 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1679 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1681 r
= fflush_and_check(u
->transient_file
);
1685 u
->transient_file
= safe_fclose(u
->transient_file
);
1686 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1689 r
= UNIT_VTABLE(u
)->load(u
);
1693 assert(u
->load_state
!= UNIT_STUB
);
1695 if (u
->load_state
== UNIT_LOADED
) {
1696 unit_add_to_target_deps_queue(u
);
1698 r
= unit_add_slice_dependencies(u
);
1702 r
= unit_add_mount_dependencies(u
);
1706 r
= unit_add_oomd_dependencies(u
);
1710 r
= unit_add_startup_units(u
);
1714 r
= unit_validate_on_failure_job_mode(u
, "OnSuccessJobMode=", u
->on_success_job_mode
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
);
1718 r
= unit_validate_on_failure_job_mode(u
, "OnFailureJobMode=", u
->on_failure_job_mode
, "OnFailure=", UNIT_ATOM_ON_FAILURE
);
1722 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1723 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1725 /* We finished loading, let's ensure our parents recalculate the members mask */
1726 unit_invalidate_cgroup_members_masks(u
);
1729 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1731 unit_add_to_dbus_queue(unit_follow_merge(u
));
1732 unit_add_to_gc_queue(u
);
1733 (void) manager_varlink_send_managed_oom_update(u
);
1738 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code
1739 * should hence return ENOEXEC to ensure units are placed in this state after loading. */
1741 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1742 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1746 /* Record the timestamp on the cache, so that if the cache gets updated between now and the next time
1747 * an attempt is made to load this unit, we know we need to check again. */
1748 if (u
->load_state
== UNIT_NOT_FOUND
)
1749 u
->fragment_not_found_timestamp_hash
= u
->manager
->unit_cache_timestamp_hash
;
1751 unit_add_to_dbus_queue(u
);
1752 unit_add_to_gc_queue(u
);
1754 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1758 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1763 if (u
&& !unit_log_level_test(u
, level
))
1764 return -ERRNO_VALUE(error
);
1766 va_start(ap
, format
);
1768 r
= log_object_internalv(level
, error
, file
, line
, func
,
1769 u
->manager
->unit_log_field
,
1771 u
->manager
->invocation_log_field
,
1772 u
->invocation_id_string
,
1775 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1781 static bool unit_test_condition(Unit
*u
) {
1782 _cleanup_strv_free_
char **env
= NULL
;
1787 dual_timestamp_get(&u
->condition_timestamp
);
1789 r
= manager_get_effective_environment(u
->manager
, &env
);
1791 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1792 u
->condition_result
= true;
1794 u
->condition_result
= condition_test_list(
1797 condition_type_to_string
,
1801 unit_add_to_dbus_queue(u
);
1802 return u
->condition_result
;
1805 static bool unit_test_assert(Unit
*u
) {
1806 _cleanup_strv_free_
char **env
= NULL
;
1811 dual_timestamp_get(&u
->assert_timestamp
);
1813 r
= manager_get_effective_environment(u
->manager
, &env
);
1815 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1816 u
->assert_result
= CONDITION_ERROR
;
1818 u
->assert_result
= condition_test_list(
1821 assert_type_to_string
,
1825 unit_add_to_dbus_queue(u
);
1826 return u
->assert_result
;
1829 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *format
, const char *ident
) {
1830 if (log_get_show_color()) {
1831 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& strchr(ident
, ' '))
1832 ident
= strjoina(ANSI_HIGHLIGHT
, u
->id
, ANSI_NORMAL
, " - ", u
->description
);
1834 ident
= strjoina(ANSI_HIGHLIGHT
, ident
, ANSI_NORMAL
);
1837 DISABLE_WARNING_FORMAT_NONLITERAL
;
1838 manager_status_printf(u
->manager
, status_type
, status
, format
, ident
);
1842 int unit_test_start_limit(Unit
*u
) {
1847 if (ratelimit_below(&u
->start_ratelimit
)) {
1848 u
->start_limit_hit
= false;
1852 log_unit_warning(u
, "Start request repeated too quickly.");
1853 u
->start_limit_hit
= true;
1855 reason
= strjoina("unit ", u
->id
, " failed");
1857 emergency_action(u
->manager
, u
->start_limit_action
,
1858 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1859 u
->reboot_arg
, -1, reason
);
1864 bool unit_shall_confirm_spawn(Unit
*u
) {
1867 if (manager_is_confirm_spawn_disabled(u
->manager
))
1870 /* For some reasons units remaining in the same process group
1871 * as PID 1 fail to acquire the console even if it's not used
1872 * by any process. So skip the confirmation question for them. */
1873 return !unit_get_exec_context(u
)->same_pgrp
;
1876 static bool unit_verify_deps(Unit
*u
) {
1881 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined
1882 * with After=. We do not check Requires= or Requisite= here as they only should have an effect on
1883 * the job processing, but do not have any effect afterwards. We don't check BindsTo= dependencies
1884 * that are not used in conjunction with After= as for them any such check would make things entirely
1887 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
1889 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
))
1892 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1893 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1901 /* Errors that aren't really errors:
1902 * -EALREADY: Unit is already started.
1903 * -ECOMM: Condition failed
1904 * -EAGAIN: An operation is already in progress. Retry later.
1906 * Errors that are real errors:
1907 * -EBADR: This unit type does not support starting.
1908 * -ECANCELED: Start limit hit, too many requests for now
1909 * -EPROTO: Assert failed
1910 * -EINVAL: Unit not loaded
1911 * -EOPNOTSUPP: Unit type not supported
1912 * -ENOLINK: The necessary dependencies are not fulfilled.
1913 * -ESTALE: This unit has been started before and can't be started a second time
1914 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1916 int unit_start(Unit
*u
, ActivationDetails
*details
) {
1917 UnitActiveState state
;
1923 /* Let's hold off running start jobs for mount units when /proc/self/mountinfo monitor is ratelimited. */
1924 if (UNIT_VTABLE(u
)->subsystem_ratelimited
) {
1925 r
= UNIT_VTABLE(u
)->subsystem_ratelimited(u
->manager
);
1932 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1933 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1934 * waiting is finished. */
1935 state
= unit_active_state(u
);
1936 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1938 if (state
== UNIT_MAINTENANCE
)
1941 /* Units that aren't loaded cannot be started */
1942 if (u
->load_state
!= UNIT_LOADED
)
1945 /* Refuse starting scope units more than once */
1946 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1949 /* If the conditions were unmet, don't do anything at all. If we already are activating this call might
1950 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1951 * recheck the condition in that case. */
1952 if (state
!= UNIT_ACTIVATING
&&
1953 !unit_test_condition(u
))
1954 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition not met. Not starting unit.");
1956 /* If the asserts failed, fail the entire job */
1957 if (state
!= UNIT_ACTIVATING
&&
1958 !unit_test_assert(u
))
1959 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1961 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1962 * condition checks, so that we rather return condition check errors (which are usually not
1963 * considered a true failure) than "not supported" errors (which are considered a failure).
1965 if (!unit_type_supported(u
->type
))
1968 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1969 * should have taken care of this already, but let's check this here again. After all, our
1970 * dependencies might not be in effect anymore, due to a reload or due to an unmet condition. */
1971 if (!unit_verify_deps(u
))
1974 /* Forward to the main object, if we aren't it. */
1975 following
= unit_following(u
);
1977 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1978 return unit_start(following
, details
);
1981 /* Check our ability to start early so that failure conditions don't cause us to enter a busy loop. */
1982 if (UNIT_VTABLE(u
)->can_start
) {
1983 r
= UNIT_VTABLE(u
)->can_start(u
);
1988 /* If it is stopped, but we cannot start it, then fail */
1989 if (!UNIT_VTABLE(u
)->start
)
1992 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1993 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1994 * waits for a holdoff timer to elapse before it will start again. */
1996 unit_add_to_dbus_queue(u
);
1997 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1999 if (!u
->activation_details
) /* Older details object wins */
2000 u
->activation_details
= activation_details_ref(details
);
2002 return UNIT_VTABLE(u
)->start(u
);
2005 bool unit_can_start(Unit
*u
) {
2008 if (u
->load_state
!= UNIT_LOADED
)
2011 if (!unit_type_supported(u
->type
))
2014 /* Scope units may be started only once */
2015 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
2018 return !!UNIT_VTABLE(u
)->start
;
2021 bool unit_can_isolate(Unit
*u
) {
2024 return unit_can_start(u
) &&
2029 * -EBADR: This unit type does not support stopping.
2030 * -EALREADY: Unit is already stopped.
2031 * -EAGAIN: An operation is already in progress. Retry later.
2033 int unit_stop(Unit
*u
) {
2034 UnitActiveState state
;
2039 state
= unit_active_state(u
);
2040 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
2043 following
= unit_following(u
);
2045 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
2046 return unit_stop(following
);
2049 if (!UNIT_VTABLE(u
)->stop
)
2052 unit_add_to_dbus_queue(u
);
2053 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2055 return UNIT_VTABLE(u
)->stop(u
);
2058 bool unit_can_stop(Unit
*u
) {
2061 /* Note: if we return true here, it does not mean that the unit may be successfully stopped.
2062 * Extrinsic units follow external state and they may stop following external state changes
2063 * (hence we return true here), but an attempt to do this through the manager will fail. */
2065 if (!unit_type_supported(u
->type
))
2071 return !!UNIT_VTABLE(u
)->stop
;
2075 * -EBADR: This unit type does not support reloading.
2076 * -ENOEXEC: Unit is not started.
2077 * -EAGAIN: An operation is already in progress. Retry later.
2079 int unit_reload(Unit
*u
) {
2080 UnitActiveState state
;
2085 if (u
->load_state
!= UNIT_LOADED
)
2088 if (!unit_can_reload(u
))
2091 state
= unit_active_state(u
);
2092 if (state
== UNIT_RELOADING
)
2095 if (state
!= UNIT_ACTIVE
)
2096 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
), "Unit cannot be reloaded because it is inactive.");
2098 following
= unit_following(u
);
2100 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
2101 return unit_reload(following
);
2104 unit_add_to_dbus_queue(u
);
2106 if (!UNIT_VTABLE(u
)->reload
) {
2107 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
2108 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), /* reload_success = */ true);
2112 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2114 return UNIT_VTABLE(u
)->reload(u
);
2117 bool unit_can_reload(Unit
*u
) {
2120 if (UNIT_VTABLE(u
)->can_reload
)
2121 return UNIT_VTABLE(u
)->can_reload(u
);
2123 if (unit_has_dependency(u
, UNIT_ATOM_PROPAGATES_RELOAD_TO
, NULL
))
2126 return UNIT_VTABLE(u
)->reload
;
2129 bool unit_is_unneeded(Unit
*u
) {
2133 if (!u
->stop_when_unneeded
)
2136 /* Don't clean up while the unit is transitioning or is even inactive. */
2137 if (unit_active_state(u
) != UNIT_ACTIVE
)
2142 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_PINS_STOP_WHEN_UNNEEDED
) {
2143 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
2144 * restart, then don't clean this one up. */
2149 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2152 if (unit_will_restart(other
))
2159 bool unit_is_upheld_by_active(Unit
*u
, Unit
**ret_culprit
) {
2164 /* Checks if the unit needs to be started because it currently is not running, but some other unit
2165 * that is active declared an Uphold= dependencies on it */
2167 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)) || u
->job
) {
2169 *ret_culprit
= NULL
;
2173 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_START_STEADILY
) {
2177 if (UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
2179 *ret_culprit
= other
;
2185 *ret_culprit
= NULL
;
2189 bool unit_is_bound_by_inactive(Unit
*u
, Unit
**ret_culprit
) {
2194 /* Checks whether this unit is bound to another unit that is inactive, i.e. whether we should stop
2195 * because the other unit is down. */
2197 if (unit_active_state(u
) != UNIT_ACTIVE
|| u
->job
) {
2198 /* Don't clean up while the unit is transitioning or is even inactive. */
2200 *ret_culprit
= NULL
;
2204 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
2208 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
))) {
2210 *ret_culprit
= other
;
2217 *ret_culprit
= NULL
;
2221 static void check_unneeded_dependencies(Unit
*u
) {
2225 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2227 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_STOP_WHEN_UNNEEDED_QUEUE
)
2228 unit_submit_to_stop_when_unneeded_queue(other
);
2231 static void check_uphold_dependencies(Unit
*u
) {
2235 /* Add all units this unit depends on to the queue that processes Uphold= behaviour. */
2237 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_START_WHEN_UPHELD_QUEUE
)
2238 unit_submit_to_start_when_upheld_queue(other
);
2241 static void check_bound_by_dependencies(Unit
*u
) {
2245 /* Add all units this unit depends on to the queue that processes BindsTo= stop behaviour. */
2247 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_CANNOT_BE_ACTIVE_WITHOUT_QUEUE
)
2248 unit_submit_to_stop_when_bound_queue(other
);
2251 static void retroactively_start_dependencies(Unit
*u
) {
2255 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2257 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_REPLACE
) /* Requires= + BindsTo= */
2258 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2259 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2260 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2262 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_FAIL
) /* Wants= */
2263 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2264 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2265 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2267 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_START
) /* Conflicts= (and inverse) */
2268 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2269 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2272 static void retroactively_stop_dependencies(Unit
*u
) {
2276 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2278 /* Pull down units which are bound to us recursively if enabled */
2279 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_STOP
) /* BoundBy= */
2280 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2281 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2284 void unit_start_on_failure(
2286 const char *dependency_name
,
2287 UnitDependencyAtom atom
,
2295 assert(dependency_name
);
2296 assert(IN_SET(atom
, UNIT_ATOM_ON_SUCCESS
, UNIT_ATOM_ON_FAILURE
));
2298 /* Act on OnFailure= and OnSuccess= dependencies */
2300 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
2301 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2304 log_unit_info(u
, "Triggering %s dependencies.", dependency_name
);
2308 r
= manager_add_job(u
->manager
, JOB_START
, other
, job_mode
, NULL
, &error
, NULL
);
2310 log_unit_warning_errno(
2311 u
, r
, "Failed to enqueue %s job, ignoring: %s",
2312 dependency_name
, bus_error_message(&error
, r
));
2317 log_unit_debug(u
, "Triggering %s dependencies done (%i %s).",
2318 dependency_name
, n_jobs
, n_jobs
== 1 ? "job" : "jobs");
2321 void unit_trigger_notify(Unit
*u
) {
2326 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_TRIGGERED_BY
)
2327 if (UNIT_VTABLE(other
)->trigger_notify
)
2328 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2331 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2332 if (condition_notice
&& log_level
> LOG_NOTICE
)
2334 if (condition_info
&& log_level
> LOG_INFO
)
2339 static int unit_log_resources(Unit
*u
) {
2340 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4];
2341 bool any_traffic
= false, have_ip_accounting
= false, any_io
= false, have_io_accounting
= false;
2342 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
, *rr
= NULL
, *wr
= NULL
;
2343 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a threshold */
2344 size_t n_message_parts
= 0, n_iovec
= 0;
2345 char* message_parts
[1 + 2 + 2 + 1], *t
;
2346 nsec_t nsec
= NSEC_INFINITY
;
2348 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2349 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2350 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2351 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2352 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2354 const char* const io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2355 [CGROUP_IO_READ_BYTES
] = "IO_METRIC_READ_BYTES",
2356 [CGROUP_IO_WRITE_BYTES
] = "IO_METRIC_WRITE_BYTES",
2357 [CGROUP_IO_READ_OPERATIONS
] = "IO_METRIC_READ_OPERATIONS",
2358 [CGROUP_IO_WRITE_OPERATIONS
] = "IO_METRIC_WRITE_OPERATIONS",
2363 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2364 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2365 * information and the complete data in structured fields. */
2367 (void) unit_get_cpu_usage(u
, &nsec
);
2368 if (nsec
!= NSEC_INFINITY
) {
2369 /* Format the CPU time for inclusion in the structured log message */
2370 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2374 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2376 /* Format the CPU time for inclusion in the human language message string */
2377 t
= strjoin("consumed ", FORMAT_TIMESPAN(nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
), " CPU time");
2383 message_parts
[n_message_parts
++] = t
;
2385 log_level
= raise_level(log_level
,
2386 nsec
> MENTIONWORTHY_CPU_NSEC
,
2387 nsec
> NOTICEWORTHY_CPU_NSEC
);
2390 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2391 uint64_t value
= UINT64_MAX
;
2393 assert(io_fields
[k
]);
2395 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2396 if (value
== UINT64_MAX
)
2399 have_io_accounting
= true;
2403 /* Format IO accounting data for inclusion in the structured log message */
2404 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2408 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2410 /* Format the IO accounting data for inclusion in the human language message string, but only
2411 * for the bytes counters (and not for the operations counters) */
2412 if (k
== CGROUP_IO_READ_BYTES
) {
2414 rr
= strjoin("read ", strna(FORMAT_BYTES(value
)), " from disk");
2419 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2421 wr
= strjoin("written ", strna(FORMAT_BYTES(value
)), " to disk");
2428 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2429 log_level
= raise_level(log_level
,
2430 value
> MENTIONWORTHY_IO_BYTES
,
2431 value
> NOTICEWORTHY_IO_BYTES
);
2434 if (have_io_accounting
) {
2437 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2439 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2444 k
= strdup("no IO");
2450 message_parts
[n_message_parts
++] = k
;
2454 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2455 uint64_t value
= UINT64_MAX
;
2457 assert(ip_fields
[m
]);
2459 (void) unit_get_ip_accounting(u
, m
, &value
);
2460 if (value
== UINT64_MAX
)
2463 have_ip_accounting
= true;
2467 /* Format IP accounting data for inclusion in the structured log message */
2468 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2472 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2474 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2475 * bytes counters (and not for the packets counters) */
2476 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2478 igress
= strjoin("received ", strna(FORMAT_BYTES(value
)), " IP traffic");
2483 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2485 egress
= strjoin("sent ", strna(FORMAT_BYTES(value
)), " IP traffic");
2492 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2493 log_level
= raise_level(log_level
,
2494 value
> MENTIONWORTHY_IP_BYTES
,
2495 value
> NOTICEWORTHY_IP_BYTES
);
2498 /* This check is here because it is the earliest point following all possible log_level assignments. If
2499 * log_level is assigned anywhere after this point, move this check. */
2500 if (!unit_log_level_test(u
, log_level
)) {
2505 if (have_ip_accounting
) {
2508 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2510 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2515 k
= strdup("no IP traffic");
2521 message_parts
[n_message_parts
++] = k
;
2525 /* Is there any accounting data available at all? */
2531 if (n_message_parts
== 0)
2532 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2534 _cleanup_free_
char *joined
= NULL
;
2536 message_parts
[n_message_parts
] = NULL
;
2538 joined
= strv_join(message_parts
, ", ");
2544 joined
[0] = ascii_toupper(joined
[0]);
2545 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2548 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2549 * and hence don't increase n_iovec for them */
2550 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2551 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2553 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2554 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2556 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2557 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2559 log_unit_struct_iovec(u
, log_level
, iovec
, n_iovec
+ 4);
2563 for (size_t i
= 0; i
< n_message_parts
; i
++)
2564 free(message_parts
[i
]);
2566 for (size_t i
= 0; i
< n_iovec
; i
++)
2567 free(iovec
[i
].iov_base
);
2573 static void unit_update_on_console(Unit
*u
) {
2578 b
= unit_needs_console(u
);
2579 if (u
->on_console
== b
)
2584 manager_ref_console(u
->manager
);
2586 manager_unref_console(u
->manager
);
2589 static void unit_emit_audit_start(Unit
*u
) {
2592 if (UNIT_VTABLE(u
)->audit_start_message_type
<= 0)
2595 /* Write audit record if we have just finished starting up */
2596 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_start_message_type
, /* success= */ true);
2600 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2603 if (UNIT_VTABLE(u
)->audit_start_message_type
<= 0)
2607 /* Write audit record if we have just finished shutting down */
2608 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_stop_message_type
, /* success= */ state
== UNIT_INACTIVE
);
2609 u
->in_audit
= false;
2611 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2612 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_start_message_type
, /* success= */ state
== UNIT_INACTIVE
);
2614 if (state
== UNIT_INACTIVE
)
2615 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_stop_message_type
, /* success= */ true);
2619 static bool unit_process_job(Job
*j
, UnitActiveState ns
, bool reload_success
) {
2620 bool unexpected
= false;
2625 if (j
->state
== JOB_WAITING
)
2626 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2628 job_add_to_run_queue(j
);
2630 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2631 * hence needs to invalidate jobs. */
2636 case JOB_VERIFY_ACTIVE
:
2638 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2639 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2640 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2643 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2644 if (ns
== UNIT_FAILED
)
2645 result
= JOB_FAILED
;
2649 job_finish_and_invalidate(j
, result
, true, false);
2656 case JOB_RELOAD_OR_START
:
2657 case JOB_TRY_RELOAD
:
2659 if (j
->state
== JOB_RUNNING
) {
2660 if (ns
== UNIT_ACTIVE
)
2661 job_finish_and_invalidate(j
, reload_success
? JOB_DONE
: JOB_FAILED
, true, false);
2662 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2665 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2666 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2674 case JOB_TRY_RESTART
:
2676 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2677 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2678 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2680 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2686 assert_not_reached();
2692 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, bool reload_success
) {
2697 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2698 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2700 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2701 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2702 * remounted this function will be called too! */
2706 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2707 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2708 unit_add_to_dbus_queue(u
);
2710 /* Update systemd-oomd on the property/state change */
2712 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2714 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2715 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2716 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2717 * have the information on the property. Thus, indiscriminately send an update. */
2718 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2719 (void) manager_varlink_send_managed_oom_update(u
);
2722 /* Update timestamps for state changes */
2723 if (!MANAGER_IS_RELOADING(m
)) {
2724 dual_timestamp_get(&u
->state_change_timestamp
);
2726 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2727 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2728 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2729 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2731 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2732 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2733 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2734 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2737 /* Keep track of failed units */
2738 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2740 /* Make sure the cgroup and state files are always removed when we become inactive */
2741 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2742 SET_FLAG(u
->markers
,
2743 (1u << UNIT_MARKER_NEEDS_RELOAD
)|(1u << UNIT_MARKER_NEEDS_RESTART
),
2745 unit_prune_cgroup(u
);
2746 unit_unlink_state_files(u
);
2747 } else if (ns
!= os
&& ns
== UNIT_RELOADING
)
2748 SET_FLAG(u
->markers
, 1u << UNIT_MARKER_NEEDS_RELOAD
, false);
2750 unit_update_on_console(u
);
2752 if (!MANAGER_IS_RELOADING(m
)) {
2755 /* Let's propagate state changes to the job */
2757 unexpected
= unit_process_job(u
->job
, ns
, reload_success
);
2761 /* If this state change happened without being requested by a job, then let's retroactively start or
2762 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2763 * additional jobs just because something is already activated. */
2766 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2767 retroactively_start_dependencies(u
);
2768 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2769 retroactively_stop_dependencies(u
);
2772 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2773 log_unit_debug(u
, "Unit entered failed state.");
2774 unit_start_on_failure(u
, "OnFailure=", UNIT_ATOM_ON_FAILURE
, u
->on_failure_job_mode
);
2777 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2778 /* This unit just finished starting up */
2780 unit_emit_audit_start(u
);
2781 manager_send_unit_plymouth(m
, u
);
2784 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2785 /* This unit just stopped/failed. */
2787 unit_emit_audit_stop(u
, ns
);
2788 unit_log_resources(u
);
2791 if (ns
== UNIT_INACTIVE
&& !IN_SET(os
, UNIT_FAILED
, UNIT_INACTIVE
, UNIT_MAINTENANCE
))
2792 unit_start_on_failure(u
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
, u
->on_success_job_mode
);
2795 manager_recheck_journal(m
);
2796 manager_recheck_dbus(m
);
2798 unit_trigger_notify(u
);
2800 if (!MANAGER_IS_RELOADING(m
)) {
2801 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2802 reason
= strjoina("unit ", u
->id
, " failed");
2803 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2804 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2805 reason
= strjoina("unit ", u
->id
, " succeeded");
2806 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2810 /* And now, add the unit or depending units to various queues that will act on the new situation if
2811 * needed. These queues generally check for continuous state changes rather than events (like most of
2812 * the state propagation above), and do work deferred instead of instantly, since they typically
2813 * don't want to run during reloading, and usually involve checking combined state of multiple units
2816 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2817 /* Stop unneeded units and bound-by units regardless if going down was expected or not */
2818 check_unneeded_dependencies(u
);
2819 check_bound_by_dependencies(u
);
2821 /* Maybe someone wants us to remain up? */
2822 unit_submit_to_start_when_upheld_queue(u
);
2824 /* Maybe the unit should be GC'ed now? */
2825 unit_add_to_gc_queue(u
);
2827 /* Maybe we can release some resources now? */
2828 unit_submit_to_release_resources_queue(u
);
2831 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2832 /* Start uphold units regardless if going up was expected or not */
2833 check_uphold_dependencies(u
);
2835 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2836 unit_submit_to_stop_when_unneeded_queue(u
);
2838 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens
2839 * when something BindsTo= to a Type=oneshot unit, as these units go directly from starting to
2840 * inactive, without ever entering started.) */
2841 unit_submit_to_stop_when_bound_queue(u
);
2845 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2849 assert(pid_is_valid(pid
));
2851 /* Watch a specific PID */
2853 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2854 * opportunity to remove any stalled references to this PID as they can be created
2855 * easily (when watching a process which is not our direct child). */
2857 manager_unwatch_pid(u
->manager
, pid
);
2859 r
= set_ensure_allocated(&u
->pids
, NULL
);
2863 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2867 /* First try, let's add the unit keyed by "pid". */
2868 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2874 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2875 * to an array of Units rather than just a Unit), lists us already. */
2877 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2879 for (; array
[n
]; n
++)
2886 /* Allocate a new array */
2887 new_array
= new(Unit
*, n
+ 2);
2891 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2893 new_array
[n
+1] = NULL
;
2895 /* Add or replace the old array */
2896 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2907 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2914 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2918 assert(pid_is_valid(pid
));
2920 /* First let's drop the unit in case it's keyed as "pid". */
2921 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2923 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2924 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2926 /* Let's iterate through the array, dropping our own entry */
2929 for (size_t n
= 0; array
[n
]; n
++)
2931 array
[m
++] = array
[n
];
2935 /* The array is now empty, remove the entire entry */
2936 assert_se(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2941 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2944 void unit_unwatch_all_pids(Unit
*u
) {
2947 while (!set_isempty(u
->pids
))
2948 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2950 u
->pids
= set_free(u
->pids
);
2953 static void unit_tidy_watch_pids(Unit
*u
) {
2954 pid_t except1
, except2
;
2959 /* Cleans dead PIDs from our list */
2961 except1
= unit_main_pid(u
);
2962 except2
= unit_control_pid(u
);
2964 SET_FOREACH(e
, u
->pids
) {
2965 pid_t pid
= PTR_TO_PID(e
);
2967 if (pid
== except1
|| pid
== except2
)
2970 if (!pid_is_unwaited(pid
))
2971 unit_unwatch_pid(u
, pid
);
2975 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2976 Unit
*u
= ASSERT_PTR(userdata
);
2980 unit_tidy_watch_pids(u
);
2981 unit_watch_all_pids(u
);
2983 /* If the PID set is empty now, then let's finish this off. */
2984 unit_synthesize_cgroup_empty_event(u
);
2989 int unit_enqueue_rewatch_pids(Unit
*u
) {
2994 if (!u
->cgroup_path
)
2997 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
3000 if (r
> 0) /* On unified we can use proper notifications */
3003 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
3004 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
3005 * involves issuing kill(pid, 0) on all processes we watch. */
3007 if (!u
->rewatch_pids_event_source
) {
3008 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
3010 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
3012 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
3014 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
3016 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
3018 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
3020 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
3023 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
3025 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
3030 void unit_dequeue_rewatch_pids(Unit
*u
) {
3034 if (!u
->rewatch_pids_event_source
)
3037 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
3039 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
3041 u
->rewatch_pids_event_source
= sd_event_source_disable_unref(u
->rewatch_pids_event_source
);
3044 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
3046 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
3050 case JOB_VERIFY_ACTIVE
:
3053 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
3054 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
3059 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
3060 * external events), hence it makes no sense to permit enqueuing such a request either. */
3061 return !u
->perpetual
;
3064 case JOB_TRY_RESTART
:
3065 return unit_can_stop(u
) && unit_can_start(u
);
3068 case JOB_TRY_RELOAD
:
3069 return unit_can_reload(u
);
3071 case JOB_RELOAD_OR_START
:
3072 return unit_can_reload(u
) && unit_can_start(u
);
3075 assert_not_reached();
3079 static Hashmap
*unit_get_dependency_hashmap_per_type(Unit
*u
, UnitDependency d
) {
3083 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3085 deps
= hashmap_get(u
->dependencies
, UNIT_DEPENDENCY_TO_PTR(d
));
3087 _cleanup_hashmap_free_ Hashmap
*h
= NULL
;
3089 h
= hashmap_new(NULL
);
3093 if (hashmap_ensure_put(&u
->dependencies
, NULL
, UNIT_DEPENDENCY_TO_PTR(d
), h
) < 0)
3102 typedef enum NotifyDependencyFlags
{
3103 NOTIFY_DEPENDENCY_UPDATE_FROM
= 1 << 0,
3104 NOTIFY_DEPENDENCY_UPDATE_TO
= 1 << 1,
3105 } NotifyDependencyFlags
;
3107 static int unit_add_dependency_impl(
3111 UnitDependencyMask mask
) {
3113 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
3114 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
3115 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
3116 [UNIT_WANTS
] = UNIT_WANTED_BY
,
3117 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
3118 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
3119 [UNIT_UPHOLDS
] = UNIT_UPHELD_BY
,
3120 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
3121 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
3122 [UNIT_WANTED_BY
] = UNIT_WANTS
,
3123 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
3124 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
3125 [UNIT_UPHELD_BY
] = UNIT_UPHOLDS
,
3126 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
3127 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
3128 [UNIT_BEFORE
] = UNIT_AFTER
,
3129 [UNIT_AFTER
] = UNIT_BEFORE
,
3130 [UNIT_ON_SUCCESS
] = UNIT_ON_SUCCESS_OF
,
3131 [UNIT_ON_SUCCESS_OF
] = UNIT_ON_SUCCESS
,
3132 [UNIT_ON_FAILURE
] = UNIT_ON_FAILURE_OF
,
3133 [UNIT_ON_FAILURE_OF
] = UNIT_ON_FAILURE
,
3134 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
3135 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
3136 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3137 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3138 [UNIT_PROPAGATES_STOP_TO
] = UNIT_STOP_PROPAGATED_FROM
,
3139 [UNIT_STOP_PROPAGATED_FROM
] = UNIT_PROPAGATES_STOP_TO
,
3140 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
, /* symmetric! 👓 */
3141 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3142 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3143 [UNIT_IN_SLICE
] = UNIT_SLICE_OF
,
3144 [UNIT_SLICE_OF
] = UNIT_IN_SLICE
,
3147 Hashmap
*u_deps
, *other_deps
;
3148 UnitDependencyInfo u_info
, u_info_old
, other_info
, other_info_old
;
3149 NotifyDependencyFlags flags
= 0;
3154 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3155 assert(inverse_table
[d
] >= 0 && inverse_table
[d
] < _UNIT_DEPENDENCY_MAX
);
3156 assert(mask
> 0 && mask
< _UNIT_DEPENDENCY_MASK_FULL
);
3158 /* Ensure the following two hashmaps for each unit exist:
3159 * - the top-level dependency hashmap that maps UnitDependency → Hashmap(Unit* → UnitDependencyInfo),
3160 * - the inner hashmap, that maps Unit* → UnitDependencyInfo, for the specified dependency type. */
3161 u_deps
= unit_get_dependency_hashmap_per_type(u
, d
);
3165 other_deps
= unit_get_dependency_hashmap_per_type(other
, inverse_table
[d
]);
3169 /* Save the original dependency info. */
3170 u_info
.data
= u_info_old
.data
= hashmap_get(u_deps
, other
);
3171 other_info
.data
= other_info_old
.data
= hashmap_get(other_deps
, u
);
3173 /* Update dependency info. */
3174 u_info
.origin_mask
|= mask
;
3175 other_info
.destination_mask
|= mask
;
3177 /* Save updated dependency info. */
3178 if (u_info
.data
!= u_info_old
.data
) {
3179 r
= hashmap_replace(u_deps
, other
, u_info
.data
);
3183 flags
= NOTIFY_DEPENDENCY_UPDATE_FROM
;
3186 if (other_info
.data
!= other_info_old
.data
) {
3187 r
= hashmap_replace(other_deps
, u
, other_info
.data
);
3189 if (u_info
.data
!= u_info_old
.data
) {
3190 /* Restore the old dependency. */
3191 if (u_info_old
.data
)
3192 (void) hashmap_update(u_deps
, other
, u_info_old
.data
);
3194 hashmap_remove(u_deps
, other
);
3199 flags
|= NOTIFY_DEPENDENCY_UPDATE_TO
;
3205 int unit_add_dependency(
3210 UnitDependencyMask mask
) {
3212 UnitDependencyAtom a
;
3215 /* Helper to know whether sending a notification is necessary or not: if the dependency is already
3216 * there, no need to notify! */
3217 NotifyDependencyFlags notify_flags
;
3220 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3223 u
= unit_follow_merge(u
);
3224 other
= unit_follow_merge(other
);
3225 a
= unit_dependency_to_atom(d
);
3228 /* We won't allow dependencies on ourselves. We will not consider them an error however. */
3230 if (unit_should_warn_about_dependency(d
))
3231 log_unit_warning(u
, "Dependency %s=%s is dropped.",
3232 unit_dependency_to_string(d
), u
->id
);
3236 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3239 /* Note that ordering a device unit after a unit is permitted since it allows to start its job
3240 * running timeout at a specific time. */
3241 if (FLAGS_SET(a
, UNIT_ATOM_BEFORE
) && other
->type
== UNIT_DEVICE
) {
3242 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3246 if (FLAGS_SET(a
, UNIT_ATOM_ON_FAILURE
) && !UNIT_VTABLE(u
)->can_fail
) {
3247 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3251 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERS
) && !UNIT_VTABLE(u
)->can_trigger
)
3252 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3253 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3254 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERED_BY
) && !UNIT_VTABLE(other
)->can_trigger
)
3255 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3256 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3258 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && other
->type
!= UNIT_SLICE
)
3259 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3260 "Requested dependency Slice=%s refused (%s is not a slice unit).", other
->id
, other
->id
);
3261 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && u
->type
!= UNIT_SLICE
)
3262 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3263 "Requested dependency SliceOf=%s refused (%s is not a slice unit).", other
->id
, u
->id
);
3265 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && !UNIT_HAS_CGROUP_CONTEXT(u
))
3266 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3267 "Requested dependency Slice=%s refused (%s is not a cgroup unit).", other
->id
, u
->id
);
3269 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && !UNIT_HAS_CGROUP_CONTEXT(other
))
3270 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3271 "Requested dependency SliceOf=%s refused (%s is not a cgroup unit).", other
->id
, other
->id
);
3273 r
= unit_add_dependency_impl(u
, d
, other
, mask
);
3278 if (add_reference
) {
3279 r
= unit_add_dependency_impl(u
, UNIT_REFERENCES
, other
, mask
);
3285 if (FLAGS_SET(notify_flags
, NOTIFY_DEPENDENCY_UPDATE_FROM
))
3286 unit_add_to_dbus_queue(u
);
3287 if (FLAGS_SET(notify_flags
, NOTIFY_DEPENDENCY_UPDATE_TO
))
3288 unit_add_to_dbus_queue(other
);
3290 return notify_flags
!= 0;
3293 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3297 assert(d
>= 0 || e
>= 0);
3300 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3306 s
= unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3311 return r
> 0 || s
> 0;
3314 int unit_add_dependencies_on_real_shutdown_targets(Unit
*u
) {
3319 STRV_FOREACH(target
, STRV_MAKE(SPECIAL_REBOOT_TARGET
,
3320 SPECIAL_KEXEC_TARGET
,
3321 SPECIAL_HALT_TARGET
,
3322 SPECIAL_POWEROFF_TARGET
)) {
3323 r
= unit_add_two_dependencies_by_name(u
,
3327 /* add_reference= */ true,
3328 UNIT_DEPENDENCY_DEFAULT
);
3336 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3344 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3351 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3353 _cleanup_free_
char *i
= NULL
;
3355 r
= unit_name_to_prefix(u
->id
, &i
);
3359 r
= unit_name_replace_instance(name
, i
, buf
);
3368 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3369 _cleanup_free_
char *buf
= NULL
;
3376 r
= resolve_template(u
, name
, &buf
, &name
);
3380 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3383 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3387 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3390 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3391 _cleanup_free_
char *buf
= NULL
;
3398 r
= resolve_template(u
, name
, &buf
, &name
);
3402 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3405 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3409 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3412 int set_unit_path(const char *p
) {
3413 /* This is mostly for debug purposes */
3414 return RET_NERRNO(setenv("SYSTEMD_UNIT_PATH", p
, 1));
3417 char *unit_dbus_path(Unit
*u
) {
3423 return unit_dbus_path_from_name(u
->id
);
3426 char *unit_dbus_path_invocation_id(Unit
*u
) {
3429 if (sd_id128_is_null(u
->invocation_id
))
3432 return unit_dbus_path_from_name(u
->invocation_id_string
);
3435 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3440 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3442 if (sd_id128_equal(u
->invocation_id
, id
))
3445 if (!sd_id128_is_null(u
->invocation_id
))
3446 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3448 if (sd_id128_is_null(id
)) {
3453 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3457 u
->invocation_id
= id
;
3458 sd_id128_to_string(id
, u
->invocation_id_string
);
3460 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3467 u
->invocation_id
= SD_ID128_NULL
;
3468 u
->invocation_id_string
[0] = 0;
3472 int unit_set_slice(Unit
*u
, Unit
*slice
) {
3478 /* Sets the unit slice if it has not been set before. Is extra careful, to only allow this for units
3479 * that actually have a cgroup context. Also, we don't allow to set this for slices (since the parent
3480 * slice is derived from the name). Make sure the unit we set is actually a slice. */
3482 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3485 if (u
->type
== UNIT_SLICE
)
3488 if (unit_active_state(u
) != UNIT_INACTIVE
)
3491 if (slice
->type
!= UNIT_SLICE
)
3494 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3495 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3498 if (UNIT_GET_SLICE(u
) == slice
)
3501 /* Disallow slice changes if @u is already bound to cgroups */
3502 if (UNIT_GET_SLICE(u
) && u
->cgroup_realized
)
3505 /* Remove any slices assigned prior; we should only have one UNIT_IN_SLICE dependency */
3506 if (UNIT_GET_SLICE(u
))
3507 unit_remove_dependencies(u
, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3509 r
= unit_add_dependency(u
, UNIT_IN_SLICE
, slice
, true, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3516 int unit_set_default_slice(Unit
*u
) {
3517 const char *slice_name
;
3523 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3526 if (UNIT_GET_SLICE(u
))
3530 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3532 /* Implicitly place all instantiated units in their
3533 * own per-template slice */
3535 r
= unit_name_to_prefix(u
->id
, &prefix
);
3539 /* The prefix is already escaped, but it might include
3540 * "-" which has a special meaning for slice units,
3541 * hence escape it here extra. */
3542 escaped
= unit_name_escape(prefix
);
3546 if (MANAGER_IS_SYSTEM(u
->manager
))
3547 slice_name
= strjoina("system-", escaped
, ".slice");
3549 slice_name
= strjoina("app-", escaped
, ".slice");
3551 } else if (unit_is_extrinsic(u
))
3552 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3553 * the root slice. They don't really belong in one of the subslices. */
3554 slice_name
= SPECIAL_ROOT_SLICE
;
3556 else if (MANAGER_IS_SYSTEM(u
->manager
))
3557 slice_name
= SPECIAL_SYSTEM_SLICE
;
3559 slice_name
= SPECIAL_APP_SLICE
;
3561 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3565 return unit_set_slice(u
, slice
);
3568 const char *unit_slice_name(Unit
*u
) {
3572 slice
= UNIT_GET_SLICE(u
);
3579 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3580 _cleanup_free_
char *t
= NULL
;
3587 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3590 if (unit_has_name(u
, t
))
3593 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3594 assert(r
< 0 || *_found
!= u
);
3598 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3599 const char *new_owner
;
3600 Unit
*u
= ASSERT_PTR(userdata
);
3605 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3607 bus_log_parse_error(r
);
3611 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3612 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3617 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3618 const sd_bus_error
*e
;
3619 const char *new_owner
;
3620 Unit
*u
= ASSERT_PTR(userdata
);
3625 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3627 e
= sd_bus_message_get_error(message
);
3629 if (!sd_bus_error_has_name(e
, SD_BUS_ERROR_NAME_HAS_NO_OWNER
)) {
3630 r
= sd_bus_error_get_errno(e
);
3631 log_unit_error_errno(u
, r
,
3632 "Unexpected error response from GetNameOwner(): %s",
3633 bus_error_message(e
, r
));
3638 r
= sd_bus_message_read(message
, "s", &new_owner
);
3640 return bus_log_parse_error(r
);
3642 assert(!isempty(new_owner
));
3645 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3646 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3651 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3652 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
*m
= NULL
;
3654 usec_t timeout_usec
= 0;
3661 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3664 /* NameOwnerChanged and GetNameOwner is used to detect when a service finished starting up. The dbus
3665 * call timeout shouldn't be earlier than that. If we couldn't get the start timeout, use the default
3666 * value defined above. */
3667 if (UNIT_VTABLE(u
)->get_timeout_start_usec
)
3668 timeout_usec
= UNIT_VTABLE(u
)->get_timeout_start_usec(u
);
3670 match
= strjoina("type='signal',"
3671 "sender='org.freedesktop.DBus',"
3672 "path='/org/freedesktop/DBus',"
3673 "interface='org.freedesktop.DBus',"
3674 "member='NameOwnerChanged',"
3675 "arg0='", name
, "'");
3677 r
= bus_add_match_full(
3682 signal_name_owner_changed
,
3689 r
= sd_bus_message_new_method_call(
3692 "org.freedesktop.DBus",
3693 "/org/freedesktop/DBus",
3694 "org.freedesktop.DBus",
3699 r
= sd_bus_message_append(m
, "s", name
);
3703 r
= sd_bus_call_async(
3705 &u
->get_name_owner_slot
,
3707 get_name_owner_handler
,
3712 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3716 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3720 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3726 /* Watch a specific name on the bus. We only support one unit
3727 * watching each name for now. */
3729 if (u
->manager
->api_bus
) {
3730 /* If the bus is already available, install the match directly.
3731 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3732 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3734 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3737 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3739 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3740 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3741 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3747 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3751 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3752 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3753 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3756 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3757 _cleanup_free_
char *e
= NULL
;
3763 /* Adds in links to the device node that this unit is based on */
3767 if (!is_device_path(what
))
3770 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3771 if (!unit_type_supported(UNIT_DEVICE
))
3774 r
= unit_name_from_path(what
, ".device", &e
);
3778 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3782 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3783 dep
= UNIT_BINDS_TO
;
3785 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3786 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3787 device
, true, mask
);
3790 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3791 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3799 if (!path_startswith(what
, "/dev/"))
3802 /* If we don't support devices, then also don't bother with blockdev@.target */
3803 if (!unit_type_supported(UNIT_DEVICE
))
3806 r
= unit_name_path_escape(what
, &escaped
);
3810 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3814 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3817 int unit_coldplug(Unit
*u
) {
3822 /* Make sure we don't enter a loop, when coldplugging recursively. */
3826 u
->coldplugged
= true;
3828 STRV_FOREACH(i
, u
->deserialized_refs
) {
3829 q
= bus_unit_track_add_name(u
, *i
);
3830 if (q
< 0 && r
>= 0)
3833 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3835 if (UNIT_VTABLE(u
)->coldplug
) {
3836 q
= UNIT_VTABLE(u
)->coldplug(u
);
3837 if (q
< 0 && r
>= 0)
3842 q
= job_coldplug(u
->job
);
3843 if (q
< 0 && r
>= 0)
3847 q
= job_coldplug(u
->nop_job
);
3848 if (q
< 0 && r
>= 0)
3855 void unit_catchup(Unit
*u
) {
3858 if (UNIT_VTABLE(u
)->catchup
)
3859 UNIT_VTABLE(u
)->catchup(u
);
3861 unit_cgroup_catchup(u
);
3864 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3870 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3871 * are never out-of-date. */
3872 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3875 if (stat(path
, &st
) < 0)
3876 /* What, cannot access this anymore? */
3880 /* For masked files check if they are still so */
3881 return !null_or_empty(&st
);
3883 /* For non-empty files check the mtime */
3884 return timespec_load(&st
.st_mtim
) > mtime
;
3889 bool unit_need_daemon_reload(Unit
*u
) {
3890 _cleanup_strv_free_
char **t
= NULL
;
3894 /* For unit files, we allow masking… */
3895 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3896 u
->load_state
== UNIT_MASKED
))
3899 /* Source paths should not be masked… */
3900 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3903 if (u
->load_state
== UNIT_LOADED
)
3904 (void) unit_find_dropin_paths(u
, &t
);
3905 if (!strv_equal(u
->dropin_paths
, t
))
3908 /* … any drop-ins that are masked are simply omitted from the list. */
3909 STRV_FOREACH(path
, u
->dropin_paths
)
3910 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3916 void unit_reset_failed(Unit
*u
) {
3919 if (UNIT_VTABLE(u
)->reset_failed
)
3920 UNIT_VTABLE(u
)->reset_failed(u
);
3922 ratelimit_reset(&u
->start_ratelimit
);
3923 u
->start_limit_hit
= false;
3926 Unit
*unit_following(Unit
*u
) {
3929 if (UNIT_VTABLE(u
)->following
)
3930 return UNIT_VTABLE(u
)->following(u
);
3935 bool unit_stop_pending(Unit
*u
) {
3938 /* This call does check the current state of the unit. It's
3939 * hence useful to be called from state change calls of the
3940 * unit itself, where the state isn't updated yet. This is
3941 * different from unit_inactive_or_pending() which checks both
3942 * the current state and for a queued job. */
3944 return unit_has_job_type(u
, JOB_STOP
);
3947 bool unit_inactive_or_pending(Unit
*u
) {
3950 /* Returns true if the unit is inactive or going down */
3952 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3955 if (unit_stop_pending(u
))
3961 bool unit_active_or_pending(Unit
*u
) {
3964 /* Returns true if the unit is active or going up */
3966 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3970 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3976 bool unit_will_restart_default(Unit
*u
) {
3979 return unit_has_job_type(u
, JOB_START
);
3982 bool unit_will_restart(Unit
*u
) {
3985 if (!UNIT_VTABLE(u
)->will_restart
)
3988 return UNIT_VTABLE(u
)->will_restart(u
);
3991 int unit_kill(Unit
*u
, KillWho w
, int signo
, int code
, int value
, sd_bus_error
*error
) {
3993 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3994 assert(SIGNAL_VALID(signo
));
3995 assert(IN_SET(code
, SI_USER
, SI_QUEUE
));
3997 if (!UNIT_VTABLE(u
)->kill
)
4000 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, code
, value
, error
);
4003 void unit_notify_cgroup_oom(Unit
*u
, bool managed_oom
) {
4006 if (UNIT_VTABLE(u
)->notify_cgroup_oom
)
4007 UNIT_VTABLE(u
)->notify_cgroup_oom(u
, managed_oom
);
4010 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
4011 _cleanup_set_free_ Set
*pid_set
= NULL
;
4014 pid_set
= set_new(NULL
);
4018 /* Exclude the main/control pids from being killed via the cgroup */
4020 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
4025 if (control_pid
> 0) {
4026 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
4031 return TAKE_PTR(pid_set
);
4034 static int kill_common_log(pid_t pid
, int signo
, void *userdata
) {
4035 _cleanup_free_
char *comm
= NULL
;
4036 Unit
*u
= ASSERT_PTR(userdata
);
4038 (void) get_process_comm(pid
, &comm
);
4039 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
4040 signal_to_string(signo
), pid
, strna(comm
));
4045 static int kill_or_sigqueue(pid_t pid
, int signo
, int code
, int value
) {
4047 assert(SIGNAL_VALID(signo
));
4052 log_debug("Killing " PID_FMT
" with signal SIG%s.", pid
, signal_to_string(signo
));
4053 return RET_NERRNO(kill(pid
, signo
));
4056 log_debug("Enqueuing value %i to " PID_FMT
" on signal SIG%s.", value
, pid
, signal_to_string(signo
));
4057 return RET_NERRNO(sigqueue(pid
, signo
, (const union sigval
) { .sival_int
= value
}));
4060 assert_not_reached();
4064 int unit_kill_common(
4072 sd_bus_error
*error
) {
4074 bool killed
= false;
4077 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
4078 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
4079 * stop a service ourselves. */
4083 assert(who
< _KILL_WHO_MAX
);
4084 assert(SIGNAL_VALID(signo
));
4085 assert(IN_SET(code
, SI_USER
, SI_QUEUE
));
4087 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
4089 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
4091 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
4094 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
4095 if (control_pid
< 0)
4096 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
4097 if (control_pid
== 0)
4098 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
4101 if (control_pid
> 0 &&
4102 IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
)) {
4103 _cleanup_free_
char *comm
= NULL
;
4104 (void) get_process_comm(control_pid
, &comm
);
4106 r
= kill_or_sigqueue(control_pid
, signo
, code
, value
);
4110 /* Report this failure both to the logs and to the client */
4111 sd_bus_error_set_errnof(
4113 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
4114 signal_to_string(signo
), control_pid
, strna(comm
));
4115 log_unit_warning_errno(
4117 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
4118 signal_to_string(signo
), control_pid
, strna(comm
));
4120 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
4121 signal_to_string(signo
), control_pid
, strna(comm
));
4127 IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
)) {
4129 _cleanup_free_
char *comm
= NULL
;
4130 (void) get_process_comm(main_pid
, &comm
);
4132 r
= kill_or_sigqueue(main_pid
, signo
, code
, value
);
4137 sd_bus_error_set_errnof(
4139 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
4140 signal_to_string(signo
), main_pid
, strna(comm
));
4143 log_unit_warning_errno(
4145 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
4146 signal_to_string(signo
), main_pid
, strna(comm
));
4149 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
4150 signal_to_string(signo
), main_pid
, strna(comm
));
4155 /* Note: if we shall enqueue rather than kill we won't do this via the cgroup mechanism, since it
4156 * doesn't really make much sense (and given that enqueued values are a relatively expensive
4157 * resource, and we shouldn't allow us to be subjects for such allocation sprees) */
4158 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
&& code
== SI_USER
) {
4159 _cleanup_set_free_ Set
*pid_set
= NULL
;
4161 /* Exclude the main/control pids from being killed via the cgroup */
4162 pid_set
= unit_pid_set(main_pid
, control_pid
);
4166 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
4168 if (!IN_SET(r
, -ESRCH
, -ENOENT
)) {
4172 sd_bus_error_set_errnof(
4174 "Failed to send signal SIG%s to auxiliary processes: %m",
4175 signal_to_string(signo
));
4178 log_unit_warning_errno(
4180 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
4181 signal_to_string(signo
));
4187 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
4188 if (ret
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
4189 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
4194 int unit_following_set(Unit
*u
, Set
**s
) {
4198 if (UNIT_VTABLE(u
)->following_set
)
4199 return UNIT_VTABLE(u
)->following_set(u
, s
);
4205 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
4210 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
4211 r
= unit_file_get_state(
4212 u
->manager
->runtime_scope
,
4215 &u
->unit_file_state
);
4217 u
->unit_file_state
= UNIT_FILE_BAD
;
4220 return u
->unit_file_state
;
4223 PresetAction
unit_get_unit_file_preset(Unit
*u
) {
4228 if (u
->unit_file_preset
< 0 && u
->fragment_path
) {
4229 _cleanup_free_
char *bn
= NULL
;
4231 r
= path_extract_filename(u
->fragment_path
, &bn
);
4233 return (u
->unit_file_preset
= r
);
4235 if (r
== O_DIRECTORY
)
4236 return (u
->unit_file_preset
= -EISDIR
);
4238 u
->unit_file_preset
= unit_file_query_preset(
4239 u
->manager
->runtime_scope
,
4245 return u
->unit_file_preset
;
4248 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
4254 unit_ref_unset(ref
);
4256 ref
->source
= source
;
4257 ref
->target
= target
;
4258 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
4262 void unit_ref_unset(UnitRef
*ref
) {
4268 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
4269 * be unreferenced now. */
4270 unit_add_to_gc_queue(ref
->target
);
4272 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
4273 ref
->source
= ref
->target
= NULL
;
4276 static int user_from_unit_name(Unit
*u
, char **ret
) {
4278 static const uint8_t hash_key
[] = {
4279 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4280 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4283 _cleanup_free_
char *n
= NULL
;
4286 r
= unit_name_to_prefix(u
->id
, &n
);
4290 if (valid_user_group_name(n
, 0)) {
4295 /* If we can't use the unit name as a user name, then let's hash it and use that */
4296 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4302 int unit_patch_contexts(Unit
*u
) {
4309 /* Patch in the manager defaults into the exec and cgroup
4310 * contexts, _after_ the rest of the settings have been
4313 ec
= unit_get_exec_context(u
);
4315 /* This only copies in the ones that need memory */
4316 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
4317 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4318 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4323 if (MANAGER_IS_USER(u
->manager
) &&
4324 !ec
->working_directory
) {
4326 r
= get_home_dir(&ec
->working_directory
);
4330 /* Allow user services to run, even if the
4331 * home directory is missing */
4332 ec
->working_directory_missing_ok
= true;
4335 if (ec
->private_devices
)
4336 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4338 if (ec
->protect_kernel_modules
)
4339 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4341 if (ec
->protect_kernel_logs
)
4342 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4344 if (ec
->protect_clock
)
4345 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4347 if (ec
->dynamic_user
) {
4349 r
= user_from_unit_name(u
, &ec
->user
);
4355 ec
->group
= strdup(ec
->user
);
4360 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4361 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4364 ec
->private_tmp
= true;
4365 ec
->remove_ipc
= true;
4366 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4367 if (ec
->protect_home
== PROTECT_HOME_NO
)
4368 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4370 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4372 ec
->no_new_privileges
= true;
4373 ec
->restrict_suid_sgid
= true;
4376 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++)
4377 exec_directory_sort(ec
->directories
+ dt
);
4380 cc
= unit_get_cgroup_context(u
);
4383 if (ec
->private_devices
&&
4384 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4385 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4387 /* Only add these if needed, as they imply that everything else is blocked. */
4388 if (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
) {
4389 if (ec
->root_image
|| ec
->mount_images
) {
4391 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4392 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4393 r
= cgroup_add_device_allow(cc
, p
, "rw");
4397 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4398 r
= cgroup_add_device_allow(cc
, p
, "rwm");
4403 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4404 * Same for mapper and verity. */
4405 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4406 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4412 if (ec
->protect_clock
) {
4413 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4418 /* If there are encrypted credentials we might need to access the TPM. */
4419 if (exec_context_has_encrypted_credentials(ec
)) {
4420 r
= cgroup_add_device_allow(cc
, "char-tpm", "rw");
4430 ExecContext
*unit_get_exec_context(const Unit
*u
) {
4437 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4441 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4444 KillContext
*unit_get_kill_context(Unit
*u
) {
4451 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4455 return (KillContext
*) ((uint8_t*) u
+ offset
);
4458 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4464 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4468 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4471 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4477 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4481 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4484 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4487 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4490 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4491 return u
->manager
->lookup_paths
.transient
;
4493 if (flags
& UNIT_PERSISTENT
)
4494 return u
->manager
->lookup_paths
.persistent_control
;
4496 if (flags
& UNIT_RUNTIME
)
4497 return u
->manager
->lookup_paths
.runtime_control
;
4502 const char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4504 assert(popcount(flags
& (UNIT_ESCAPE_EXEC_SYNTAX_ENV
| UNIT_ESCAPE_EXEC_SYNTAX
| UNIT_ESCAPE_C
)) <= 1);
4507 _cleanup_free_
char *t
= NULL
;
4509 /* Returns a string with any escaping done. If no escaping was necessary, *buf is set to NULL, and
4510 * the input pointer is returned as-is. If an allocation was needed, the return buffer pointer is
4511 * written to *buf. This means the return value always contains a properly escaped version, but *buf
4512 * only contains a pointer if an allocation was made. Callers can use this to optimize memory
4515 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4516 t
= specifier_escape(s
);
4523 /* We either do C-escaping or shell-escaping, to additionally escape characters that we parse for
4524 * ExecStart= and friends, i.e. '$' and quotes. */
4526 if (flags
& (UNIT_ESCAPE_EXEC_SYNTAX_ENV
| UNIT_ESCAPE_EXEC_SYNTAX
)) {
4529 if (flags
& UNIT_ESCAPE_EXEC_SYNTAX_ENV
) {
4530 t2
= strreplace(s
, "$", "$$");
4533 free_and_replace(t
, t2
);
4536 t2
= shell_escape(t
?: s
, "\"");
4539 free_and_replace(t
, t2
);
4543 } else if (flags
& UNIT_ESCAPE_C
) {
4549 free_and_replace(t
, t2
);
4558 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4559 _cleanup_free_
char *result
= NULL
;
4562 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command
4563 * lines in a way suitable for ExecStart= stanzas. */
4565 STRV_FOREACH(i
, l
) {
4566 _cleanup_free_
char *buf
= NULL
;
4571 p
= unit_escape_setting(*i
, flags
, &buf
);
4575 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4576 if (!GREEDY_REALLOC(result
, n
+ a
+ 1))
4590 if (!GREEDY_REALLOC(result
, n
+ 1))
4595 return TAKE_PTR(result
);
4598 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4599 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4600 const char *dir
, *wrapped
;
4607 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4610 data
= unit_escape_setting(data
, flags
, &escaped
);
4614 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4615 * previous section header is the same */
4617 if (flags
& UNIT_PRIVATE
) {
4618 if (!UNIT_VTABLE(u
)->private_section
)
4621 if (!u
->transient_file
|| u
->last_section_private
< 0)
4622 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4623 else if (u
->last_section_private
== 0)
4624 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4626 if (!u
->transient_file
|| u
->last_section_private
< 0)
4627 data
= strjoina("[Unit]\n", data
);
4628 else if (u
->last_section_private
> 0)
4629 data
= strjoina("\n[Unit]\n", data
);
4632 if (u
->transient_file
) {
4633 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4634 * write to the transient unit file. */
4635 fputs(data
, u
->transient_file
);
4637 if (!endswith(data
, "\n"))
4638 fputc('\n', u
->transient_file
);
4640 /* Remember which section we wrote this entry to */
4641 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4645 dir
= unit_drop_in_dir(u
, flags
);
4649 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4650 "# or an equivalent operation. Do not edit.\n",
4654 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4658 (void) mkdir_p_label(p
, 0755);
4660 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4661 * recreate the cache after every drop-in we write. */
4662 if (u
->manager
->unit_path_cache
) {
4663 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4668 r
= write_string_file_atomic_label(q
, wrapped
);
4672 r
= strv_push(&u
->dropin_paths
, q
);
4677 strv_uniq(u
->dropin_paths
);
4679 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4684 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4685 _cleanup_free_
char *p
= NULL
;
4693 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4696 va_start(ap
, format
);
4697 r
= vasprintf(&p
, format
, ap
);
4703 return unit_write_setting(u
, flags
, name
, p
);
4706 int unit_make_transient(Unit
*u
) {
4707 _cleanup_free_
char *path
= NULL
;
4712 if (!UNIT_VTABLE(u
)->can_transient
)
4715 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4717 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4721 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4722 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4725 f
= fopen(path
, "we");
4730 safe_fclose(u
->transient_file
);
4731 u
->transient_file
= f
;
4733 free_and_replace(u
->fragment_path
, path
);
4735 u
->source_path
= mfree(u
->source_path
);
4736 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4737 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4739 u
->load_state
= UNIT_STUB
;
4741 u
->transient
= true;
4743 unit_add_to_dbus_queue(u
);
4744 unit_add_to_gc_queue(u
);
4746 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4752 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4753 _cleanup_free_
char *comm
= NULL
;
4755 (void) get_process_comm(pid
, &comm
);
4757 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4758 only, like for example systemd's own PAM stub process. */
4759 if (comm
&& comm
[0] == '(')
4760 /* Although we didn't log anything, as this callback is used in unit_kill_context we must return 1
4761 * here to let the manager know that a process was killed. */
4764 log_unit_notice(userdata
,
4765 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4768 signal_to_string(sig
));
4773 static int operation_to_signal(
4774 const KillContext
*c
,
4776 bool *ret_noteworthy
) {
4782 case KILL_TERMINATE
:
4783 case KILL_TERMINATE_AND_LOG
:
4784 *ret_noteworthy
= false;
4785 return c
->kill_signal
;
4788 *ret_noteworthy
= false;
4789 return restart_kill_signal(c
);
4792 *ret_noteworthy
= true;
4793 return c
->final_kill_signal
;
4796 *ret_noteworthy
= true;
4797 return c
->watchdog_signal
;
4800 assert_not_reached();
4804 int unit_kill_context(
4810 bool main_pid_alien
) {
4812 bool wait_for_exit
= false, send_sighup
;
4813 cg_kill_log_func_t log_func
= NULL
;
4819 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
4820 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
4821 * which is used for user-requested killing of unit processes. */
4823 if (c
->kill_mode
== KILL_NONE
)
4827 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4829 log_func
= log_kill
;
4833 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4838 log_func(main_pid
, sig
, u
);
4840 r
= kill_and_sigcont(main_pid
, sig
);
4841 if (r
< 0 && r
!= -ESRCH
) {
4842 _cleanup_free_
char *comm
= NULL
;
4843 (void) get_process_comm(main_pid
, &comm
);
4845 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4847 if (!main_pid_alien
)
4848 wait_for_exit
= true;
4850 if (r
!= -ESRCH
&& send_sighup
)
4851 (void) kill(main_pid
, SIGHUP
);
4855 if (control_pid
> 0) {
4857 log_func(control_pid
, sig
, u
);
4859 r
= kill_and_sigcont(control_pid
, sig
);
4860 if (r
< 0 && r
!= -ESRCH
) {
4861 _cleanup_free_
char *comm
= NULL
;
4862 (void) get_process_comm(control_pid
, &comm
);
4864 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4866 wait_for_exit
= true;
4868 if (r
!= -ESRCH
&& send_sighup
)
4869 (void) kill(control_pid
, SIGHUP
);
4873 if (u
->cgroup_path
&&
4874 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4875 _cleanup_set_free_ Set
*pid_set
= NULL
;
4877 /* Exclude the main/control pids from being killed via the cgroup */
4878 pid_set
= unit_pid_set(main_pid
, control_pid
);
4882 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4884 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4888 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4889 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
4893 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4894 * we are running in a container or if this is a delegation unit, simply because cgroup
4895 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4896 * of containers it can be confused easily by left-over directories in the cgroup — which
4897 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4898 * there we get proper events. Hence rely on them. */
4900 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4901 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4902 wait_for_exit
= true;
4907 pid_set
= unit_pid_set(main_pid
, control_pid
);
4911 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4920 return wait_for_exit
;
4923 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4929 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these
4930 * paths in the unit (from the path to the UnitDependencyInfo structure indicating how to the
4931 * dependency came to be). However, we build a prefix table for all possible prefixes so that new
4932 * appearing mount units can easily determine which units to make themselves a dependency of. */
4934 if (!path_is_absolute(path
))
4937 if (hashmap_contains(u
->requires_mounts_for
, path
)) /* Exit quickly if the path is already covered. */
4940 _cleanup_free_
char *p
= strdup(path
);
4944 /* Use the canonical form of the path as the stored key. We call path_is_normalized()
4945 * only after simplification, since path_is_normalized() rejects paths with '.'.
4946 * path_is_normalized() also verifies that the path fits in PATH_MAX. */
4947 path
= path_simplify(p
);
4949 if (!path_is_normalized(path
))
4952 UnitDependencyInfo di
= {
4956 r
= hashmap_ensure_put(&u
->requires_mounts_for
, &path_hash_ops
, p
, di
.data
);
4960 TAKE_PTR(p
); /* path remains a valid pointer to the string stored in the hashmap */
4962 char prefix
[strlen(path
) + 1];
4963 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4966 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4968 _cleanup_free_
char *q
= NULL
;
4970 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4982 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4998 int unit_setup_exec_runtime(Unit
*u
) {
4999 _cleanup_(exec_shared_runtime_unrefp
) ExecSharedRuntime
*esr
= NULL
;
5000 _cleanup_(dynamic_creds_unrefp
) DynamicCreds
*dcreds
= NULL
;
5001 _cleanup_set_free_ Set
*units
= NULL
;
5008 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
5011 /* Check if there already is an ExecRuntime for this unit? */
5012 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
5016 ec
= unit_get_exec_context(u
);
5019 r
= unit_get_transitive_dependency_set(u
, UNIT_ATOM_JOINS_NAMESPACE_OF
, &units
);
5023 /* Try to get it from somebody else */
5024 SET_FOREACH(other
, units
) {
5025 r
= exec_shared_runtime_acquire(u
->manager
, NULL
, other
->id
, false, &esr
);
5033 r
= exec_shared_runtime_acquire(u
->manager
, ec
, u
->id
, true, &esr
);
5038 if (ec
->dynamic_user
) {
5039 r
= dynamic_creds_make(u
->manager
, ec
->user
, ec
->group
, &dcreds
);
5044 r
= exec_runtime_make(u
, ec
, esr
, dcreds
, rt
);
5054 bool unit_type_supported(UnitType t
) {
5055 static int8_t cache
[_UNIT_TYPE_MAX
] = {}; /* -1: disabled, 1: enabled: 0: don't know */
5058 if (_unlikely_(t
< 0))
5060 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
5063 if (cache
[t
] == 0) {
5066 e
= strjoina("SYSTEMD_SUPPORT_", unit_type_to_string(t
));
5068 r
= getenv_bool(ascii_strupper(e
));
5069 if (r
< 0 && r
!= -ENXIO
)
5070 log_debug_errno(r
, "Failed to parse $%s, ignoring: %m", e
);
5072 cache
[t
] = r
== 0 ? -1 : 1;
5077 if (!unit_vtable
[t
]->supported
)
5080 return unit_vtable
[t
]->supported();
5083 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
5089 if (!unit_log_level_test(u
, LOG_NOTICE
))
5092 r
= dir_is_empty(where
, /* ignore_hidden_or_backup= */ false);
5093 if (r
> 0 || r
== -ENOTDIR
)
5096 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
5100 log_unit_struct(u
, LOG_NOTICE
,
5101 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
5102 LOG_UNIT_INVOCATION_ID(u
),
5103 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
5107 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
5108 _cleanup_free_
char *canonical_where
= NULL
;
5114 r
= chase(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
5116 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
5120 /* We will happily ignore a trailing slash (or any redundant slashes) */
5121 if (path_equal(where
, canonical_where
))
5124 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
5125 log_unit_struct(u
, LOG_ERR
,
5126 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
5127 LOG_UNIT_INVOCATION_ID(u
),
5128 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
5134 bool unit_is_pristine(Unit
*u
) {
5137 /* Check if the unit already exists or is already around, in a number of different ways. Note that to
5138 * cater for unit types such as slice, we are generally fine with units that are marked UNIT_LOADED
5139 * even though nothing was actually loaded, as those unit types don't require a file on disk.
5141 * Note that we don't check for drop-ins here, because we allow drop-ins for transient units
5142 * identically to non-transient units, both unit-specific and hierarchical. E.g. for a-b-c.service:
5143 * service.d/….conf, a-.service.d/….conf, a-b-.service.d/….conf, a-b-c.service.d/….conf.
5146 return IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) &&
5147 !u
->fragment_path
&&
5153 pid_t
unit_control_pid(Unit
*u
) {
5156 if (UNIT_VTABLE(u
)->control_pid
)
5157 return UNIT_VTABLE(u
)->control_pid(u
);
5162 pid_t
unit_main_pid(Unit
*u
) {
5165 if (UNIT_VTABLE(u
)->main_pid
)
5166 return UNIT_VTABLE(u
)->main_pid(u
);
5171 static void unit_unref_uid_internal(
5175 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
5179 assert(_manager_unref_uid
);
5181 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
5182 * gid_t are actually the same time, with the same validity rules.
5184 * Drops a reference to UID/GID from a unit. */
5186 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5187 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5189 if (!uid_is_valid(*ref_uid
))
5192 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
5193 *ref_uid
= UID_INVALID
;
5196 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
5197 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
5200 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
5201 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
5204 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
5207 unit_unref_uid(u
, destroy_now
);
5208 unit_unref_gid(u
, destroy_now
);
5211 static int unit_ref_uid_internal(
5216 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
5222 assert(uid_is_valid(uid
));
5223 assert(_manager_ref_uid
);
5225 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
5226 * are actually the same type, and have the same validity rules.
5228 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
5229 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
5232 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5233 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5235 if (*ref_uid
== uid
)
5238 if (uid_is_valid(*ref_uid
)) /* Already set? */
5241 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
5249 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
5250 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
5253 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
5254 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
5257 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
5262 /* Reference both a UID and a GID in one go. Either references both, or neither. */
5264 if (uid_is_valid(uid
)) {
5265 r
= unit_ref_uid(u
, uid
, clean_ipc
);
5270 if (gid_is_valid(gid
)) {
5271 q
= unit_ref_gid(u
, gid
, clean_ipc
);
5274 unit_unref_uid(u
, false);
5280 return r
> 0 || q
> 0;
5283 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
5289 c
= unit_get_exec_context(u
);
5291 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
5293 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
5298 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
5303 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
5304 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
5305 * objects when no service references the UID/GID anymore. */
5307 r
= unit_ref_uid_gid(u
, uid
, gid
);
5309 unit_add_to_dbus_queue(u
);
5312 int unit_acquire_invocation_id(Unit
*u
) {
5318 r
= sd_id128_randomize(&id
);
5320 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
5322 r
= unit_set_invocation_id(u
, id
);
5324 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
5326 unit_add_to_dbus_queue(u
);
5330 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
5336 /* Copy parameters from manager */
5337 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
5341 p
->runtime_scope
= u
->manager
->runtime_scope
;
5343 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
5344 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
5345 p
->prefix
= u
->manager
->prefix
;
5346 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
5348 /* Copy parameters from unit */
5349 p
->cgroup_path
= u
->cgroup_path
;
5350 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
5352 p
->received_credentials_directory
= u
->manager
->received_credentials_directory
;
5353 p
->received_encrypted_credentials_directory
= u
->manager
->received_encrypted_credentials_directory
;
5358 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
5364 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5365 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5367 (void) unit_realize_cgroup(u
);
5369 r
= safe_fork(name
, FORK_REOPEN_LOG
|FORK_DEATHSIG
, ret
);
5373 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
);
5374 (void) ignore_signals(SIGPIPE
);
5376 if (u
->cgroup_path
) {
5377 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5379 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", empty_to_root(u
->cgroup_path
));
5387 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5394 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5398 int ret
= EXIT_SUCCESS
;
5400 STRV_FOREACH(i
, paths
) {
5401 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5403 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5411 r
= unit_watch_pid(u
, pid
, true);
5419 static void unit_update_dependency_mask(Hashmap
*deps
, Unit
*other
, UnitDependencyInfo di
) {
5423 if (di
.origin_mask
== 0 && di
.destination_mask
== 0)
5424 /* No bit set anymore, let's drop the whole entry */
5425 assert_se(hashmap_remove(deps
, other
));
5427 /* Mask was reduced, let's update the entry */
5428 assert_se(hashmap_update(deps
, other
, di
.data
) == 0);
5431 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5435 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5440 HASHMAP_FOREACH(deps
, u
->dependencies
) {
5444 UnitDependencyInfo di
;
5449 HASHMAP_FOREACH_KEY(di
.data
, other
, deps
) {
5450 Hashmap
*other_deps
;
5452 if (FLAGS_SET(~mask
, di
.origin_mask
))
5455 di
.origin_mask
&= ~mask
;
5456 unit_update_dependency_mask(deps
, other
, di
);
5458 /* We updated the dependency from our unit to the other unit now. But most
5459 * dependencies imply a reverse dependency. Hence, let's delete that one
5460 * too. For that we go through all dependency types on the other unit and
5461 * delete all those which point to us and have the right mask set. */
5463 HASHMAP_FOREACH(other_deps
, other
->dependencies
) {
5464 UnitDependencyInfo dj
;
5466 dj
.data
= hashmap_get(other_deps
, u
);
5467 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5470 dj
.destination_mask
&= ~mask
;
5471 unit_update_dependency_mask(other_deps
, u
, dj
);
5474 unit_add_to_gc_queue(other
);
5476 /* The unit 'other' may not be wanted by the unit 'u'. */
5477 unit_submit_to_stop_when_unneeded_queue(other
);
5487 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5494 if (MANAGER_IS_SYSTEM(u
->manager
))
5495 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5497 _cleanup_free_
char *user_path
= NULL
;
5498 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5501 p
= strjoin(user_path
, u
->id
);
5511 static int unit_export_invocation_id(Unit
*u
) {
5512 _cleanup_free_
char *p
= NULL
;
5517 if (u
->exported_invocation_id
)
5520 if (sd_id128_is_null(u
->invocation_id
))
5523 r
= unit_get_invocation_path(u
, &p
);
5525 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5527 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5529 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5531 u
->exported_invocation_id
= true;
5535 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5543 if (u
->exported_log_level_max
)
5546 if (c
->log_level_max
< 0)
5549 assert(c
->log_level_max
<= 7);
5551 buf
[0] = '0' + c
->log_level_max
;
5554 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5555 r
= symlink_atomic(buf
, p
);
5557 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5559 u
->exported_log_level_max
= true;
5563 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5564 _cleanup_close_
int fd
= -EBADF
;
5565 struct iovec
*iovec
;
5572 if (u
->exported_log_extra_fields
)
5575 if (c
->n_log_extra_fields
<= 0)
5578 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5579 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5581 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5582 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5584 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5585 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5588 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5589 pattern
= strjoina(p
, ".XXXXXX");
5591 fd
= mkostemp_safe(pattern
);
5593 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5595 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5597 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5601 (void) fchmod(fd
, 0644);
5603 if (rename(pattern
, p
) < 0) {
5604 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5608 u
->exported_log_extra_fields
= true;
5612 (void) unlink(pattern
);
5616 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5617 _cleanup_free_
char *buf
= NULL
;
5624 if (u
->exported_log_ratelimit_interval
)
5627 if (c
->log_ratelimit_interval_usec
== 0)
5630 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5632 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5635 r
= symlink_atomic(buf
, p
);
5637 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5639 u
->exported_log_ratelimit_interval
= true;
5643 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5644 _cleanup_free_
char *buf
= NULL
;
5651 if (u
->exported_log_ratelimit_burst
)
5654 if (c
->log_ratelimit_burst
== 0)
5657 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5659 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5662 r
= symlink_atomic(buf
, p
);
5664 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5666 u
->exported_log_ratelimit_burst
= true;
5670 void unit_export_state_files(Unit
*u
) {
5671 const ExecContext
*c
;
5678 if (MANAGER_IS_TEST_RUN(u
->manager
))
5681 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5682 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5683 * the IPC system itself and PID 1 also log to the journal.
5685 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5686 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5687 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5688 * namespace at least.
5690 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5691 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5694 (void) unit_export_invocation_id(u
);
5696 if (!MANAGER_IS_SYSTEM(u
->manager
))
5699 c
= unit_get_exec_context(u
);
5701 (void) unit_export_log_level_max(u
, c
);
5702 (void) unit_export_log_extra_fields(u
, c
);
5703 (void) unit_export_log_ratelimit_interval(u
, c
);
5704 (void) unit_export_log_ratelimit_burst(u
, c
);
5708 void unit_unlink_state_files(Unit
*u
) {
5716 /* Undoes the effect of unit_export_state() */
5718 if (u
->exported_invocation_id
) {
5719 _cleanup_free_
char *invocation_path
= NULL
;
5720 int r
= unit_get_invocation_path(u
, &invocation_path
);
5722 (void) unlink(invocation_path
);
5723 u
->exported_invocation_id
= false;
5727 if (!MANAGER_IS_SYSTEM(u
->manager
))
5730 if (u
->exported_log_level_max
) {
5731 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5734 u
->exported_log_level_max
= false;
5737 if (u
->exported_log_extra_fields
) {
5738 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5741 u
->exported_log_extra_fields
= false;
5744 if (u
->exported_log_ratelimit_interval
) {
5745 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5748 u
->exported_log_ratelimit_interval
= false;
5751 if (u
->exported_log_ratelimit_burst
) {
5752 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5755 u
->exported_log_ratelimit_burst
= false;
5759 int unit_prepare_exec(Unit
*u
) {
5764 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5765 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5766 r
= bpf_firewall_load_custom(u
);
5770 /* Prepares everything so that we can fork of a process for this unit */
5772 (void) unit_realize_cgroup(u
);
5774 if (u
->reset_accounting
) {
5775 (void) unit_reset_accounting(u
);
5776 u
->reset_accounting
= false;
5779 unit_export_state_files(u
);
5781 r
= unit_setup_exec_runtime(u
);
5788 static bool ignore_leftover_process(const char *comm
) {
5789 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5792 int unit_log_leftover_process_start(pid_t pid
, int sig
, void *userdata
) {
5793 _cleanup_free_
char *comm
= NULL
;
5795 (void) get_process_comm(pid
, &comm
);
5797 if (ignore_leftover_process(comm
))
5800 /* During start we print a warning */
5802 log_unit_warning(userdata
,
5803 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5804 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5810 int unit_log_leftover_process_stop(pid_t pid
, int sig
, void *userdata
) {
5811 _cleanup_free_
char *comm
= NULL
;
5813 (void) get_process_comm(pid
, &comm
);
5815 if (ignore_leftover_process(comm
))
5818 /* During stop we only print an informational message */
5820 log_unit_info(userdata
,
5821 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
5827 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
5830 (void) unit_pick_cgroup_path(u
);
5832 if (!u
->cgroup_path
)
5835 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_func
, u
);
5838 bool unit_needs_console(Unit
*u
) {
5840 UnitActiveState state
;
5844 state
= unit_active_state(u
);
5846 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5849 if (UNIT_VTABLE(u
)->needs_console
)
5850 return UNIT_VTABLE(u
)->needs_console(u
);
5852 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5853 ec
= unit_get_exec_context(u
);
5857 return exec_context_may_touch_console(ec
);
5860 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5865 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5866 * and not a kernel thread either */
5868 /* First, a simple range check */
5869 if (!pid_is_valid(pid
))
5870 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5872 /* Some extra safety check */
5873 if (pid
== 1 || pid
== getpid_cached())
5874 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5876 /* Don't even begin to bother with kernel threads */
5877 r
= is_kernel_thread(pid
);
5879 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5881 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5883 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5888 void unit_log_success(Unit
*u
) {
5891 /* Let's show message "Deactivated successfully" in debug mode (when manager is user) rather than in info mode.
5892 * This message has low information value for regular users and it might be a bit overwhelming on a system with
5893 * a lot of devices. */
5895 MANAGER_IS_USER(u
->manager
) ? LOG_DEBUG
: LOG_INFO
,
5896 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5897 LOG_UNIT_INVOCATION_ID(u
),
5898 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
5901 void unit_log_failure(Unit
*u
, const char *result
) {
5905 log_unit_struct(u
, LOG_WARNING
,
5906 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5907 LOG_UNIT_INVOCATION_ID(u
),
5908 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5909 "UNIT_RESULT=%s", result
);
5912 void unit_log_skip(Unit
*u
, const char *result
) {
5916 log_unit_struct(u
, LOG_INFO
,
5917 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5918 LOG_UNIT_INVOCATION_ID(u
),
5919 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5920 "UNIT_RESULT=%s", result
);
5923 void unit_log_process_exit(
5926 const char *command
,
5936 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5937 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5938 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5942 else if (code
== CLD_EXITED
)
5945 level
= LOG_WARNING
;
5947 log_unit_struct(u
, level
,
5948 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5949 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s%s",
5951 sigchld_code_to_string(code
), status
,
5952 strna(code
== CLD_EXITED
5953 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5954 : signal_to_string(status
)),
5955 success
? " (success)" : ""),
5956 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5957 "EXIT_STATUS=%i", status
,
5958 "COMMAND=%s", strna(command
),
5959 LOG_UNIT_INVOCATION_ID(u
));
5962 int unit_exit_status(Unit
*u
) {
5965 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5966 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5967 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5968 * service process has exited abnormally (signal/coredump). */
5970 if (!UNIT_VTABLE(u
)->exit_status
)
5973 return UNIT_VTABLE(u
)->exit_status(u
);
5976 int unit_failure_action_exit_status(Unit
*u
) {
5981 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5983 if (u
->failure_action_exit_status
>= 0)
5984 return u
->failure_action_exit_status
;
5986 r
= unit_exit_status(u
);
5987 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5993 int unit_success_action_exit_status(Unit
*u
) {
5998 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
6000 if (u
->success_action_exit_status
>= 0)
6001 return u
->success_action_exit_status
;
6003 r
= unit_exit_status(u
);
6004 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
6010 int unit_test_trigger_loaded(Unit
*u
) {
6013 /* Tests whether the unit to trigger is loaded */
6015 trigger
= UNIT_TRIGGER(u
);
6017 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
6018 "Refusing to start, no unit to trigger.");
6019 if (trigger
->load_state
!= UNIT_LOADED
)
6020 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
6021 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
6026 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
6030 /* EXEC_PRESERVE_RESTART is handled via unit_release_resources()! */
6031 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
)
6032 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
6034 exec_context_destroy_credentials(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], u
->id
);
6035 exec_context_destroy_mount_ns_dir(u
);
6038 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
6039 UnitActiveState state
;
6043 /* Special return values:
6045 * -EOPNOTSUPP → cleaning not supported for this unit type
6046 * -EUNATCH → cleaning not defined for this resource type
6047 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
6048 * a job queued or similar
6051 if (!UNIT_VTABLE(u
)->clean
)
6057 if (u
->load_state
!= UNIT_LOADED
)
6063 state
= unit_active_state(u
);
6064 if (state
!= UNIT_INACTIVE
)
6067 return UNIT_VTABLE(u
)->clean(u
, mask
);
6070 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
6073 if (!UNIT_VTABLE(u
)->clean
||
6074 u
->load_state
!= UNIT_LOADED
) {
6079 /* When the clean() method is set, can_clean() really should be set too */
6080 assert(UNIT_VTABLE(u
)->can_clean
);
6082 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
6085 bool unit_can_freeze(Unit
*u
) {
6088 if (UNIT_VTABLE(u
)->can_freeze
)
6089 return UNIT_VTABLE(u
)->can_freeze(u
);
6091 return UNIT_VTABLE(u
)->freeze
;
6094 void unit_frozen(Unit
*u
) {
6097 u
->freezer_state
= FREEZER_FROZEN
;
6099 bus_unit_send_pending_freezer_message(u
, false);
6102 void unit_thawed(Unit
*u
) {
6105 u
->freezer_state
= FREEZER_RUNNING
;
6107 bus_unit_send_pending_freezer_message(u
, false);
6110 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
6112 int (*method
)(Unit
*);
6116 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
6118 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
6119 if (!method
|| !cg_freezer_supported())
6125 if (u
->load_state
!= UNIT_LOADED
)
6128 s
= unit_active_state(u
);
6129 if (s
!= UNIT_ACTIVE
)
6132 if ((IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
) && action
== FREEZER_FREEZE
) ||
6133 (u
->freezer_state
== FREEZER_THAWING
&& action
== FREEZER_THAW
))
6140 assert(IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
));
6145 int unit_freeze(Unit
*u
) {
6146 return unit_freezer_action(u
, FREEZER_FREEZE
);
6149 int unit_thaw(Unit
*u
) {
6150 return unit_freezer_action(u
, FREEZER_THAW
);
6153 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
6154 int unit_freeze_vtable_common(Unit
*u
) {
6155 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
6158 int unit_thaw_vtable_common(Unit
*u
) {
6159 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
6162 Condition
*unit_find_failed_condition(Unit
*u
) {
6163 Condition
*failed_trigger
= NULL
;
6164 bool has_succeeded_trigger
= false;
6166 if (u
->condition_result
)
6169 LIST_FOREACH(conditions
, c
, u
->conditions
)
6171 if (c
->result
== CONDITION_SUCCEEDED
)
6172 has_succeeded_trigger
= true;
6173 else if (!failed_trigger
)
6175 } else if (c
->result
!= CONDITION_SUCCEEDED
)
6178 return failed_trigger
&& !has_succeeded_trigger
? failed_trigger
: NULL
;
6181 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
6182 [COLLECT_INACTIVE
] = "inactive",
6183 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
6186 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);
6188 Unit
* unit_has_dependency(const Unit
*u
, UnitDependencyAtom atom
, Unit
*other
) {
6193 /* Checks if the unit has a dependency on 'other' with the specified dependency atom. If 'other' is
6194 * NULL checks if the unit has *any* dependency of that atom. Returns 'other' if found (or if 'other'
6195 * is NULL the first entry found), or NULL if not found. */
6197 UNIT_FOREACH_DEPENDENCY(i
, u
, atom
)
6198 if (!other
|| other
== i
)
6204 int unit_get_dependency_array(const Unit
*u
, UnitDependencyAtom atom
, Unit
***ret_array
) {
6205 _cleanup_free_ Unit
**array
= NULL
;
6212 /* Gets a list of units matching a specific atom as array. This is useful when iterating through
6213 * dependencies while modifying them: the array is an "atomic snapshot" of sorts, that can be read
6214 * while the dependency table is continuously updated. */
6216 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
6217 if (!GREEDY_REALLOC(array
, n
+ 1))
6223 *ret_array
= TAKE_PTR(array
);
6225 assert(n
<= INT_MAX
);
6229 int unit_get_transitive_dependency_set(Unit
*u
, UnitDependencyAtom atom
, Set
**ret
) {
6230 _cleanup_set_free_ Set
*units
= NULL
, *queue
= NULL
;
6237 /* Similar to unit_get_dependency_array(), but also search the same dependency in other units. */
6240 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
6241 r
= set_ensure_put(&units
, NULL
, other
);
6246 r
= set_ensure_put(&queue
, NULL
, other
);
6250 } while ((u
= set_steal_first(queue
)));
6252 *ret
= TAKE_PTR(units
);
6256 const ActivationDetailsVTable
* const activation_details_vtable
[_UNIT_TYPE_MAX
] = {
6257 [UNIT_PATH
] = &activation_details_path_vtable
,
6258 [UNIT_TIMER
] = &activation_details_timer_vtable
,
6261 ActivationDetails
*activation_details_new(Unit
*trigger_unit
) {
6262 _cleanup_free_ ActivationDetails
*details
= NULL
;
6264 assert(trigger_unit
);
6265 assert(trigger_unit
->type
!= _UNIT_TYPE_INVALID
);
6266 assert(trigger_unit
->id
);
6268 details
= malloc0(activation_details_vtable
[trigger_unit
->type
]->object_size
);
6272 *details
= (ActivationDetails
) {
6274 .trigger_unit_type
= trigger_unit
->type
,
6277 details
->trigger_unit_name
= strdup(trigger_unit
->id
);
6278 if (!details
->trigger_unit_name
)
6281 if (ACTIVATION_DETAILS_VTABLE(details
)->init
)
6282 ACTIVATION_DETAILS_VTABLE(details
)->init(details
, trigger_unit
);
6284 return TAKE_PTR(details
);
6287 static ActivationDetails
*activation_details_free(ActivationDetails
*details
) {
6291 if (ACTIVATION_DETAILS_VTABLE(details
)->done
)
6292 ACTIVATION_DETAILS_VTABLE(details
)->done(details
);
6294 free(details
->trigger_unit_name
);
6296 return mfree(details
);
6299 void activation_details_serialize(ActivationDetails
*details
, FILE *f
) {
6300 if (!details
|| details
->trigger_unit_type
== _UNIT_TYPE_INVALID
)
6303 (void) serialize_item(f
, "activation-details-unit-type", unit_type_to_string(details
->trigger_unit_type
));
6304 if (details
->trigger_unit_name
)
6305 (void) serialize_item(f
, "activation-details-unit-name", details
->trigger_unit_name
);
6306 if (ACTIVATION_DETAILS_VTABLE(details
)->serialize
)
6307 ACTIVATION_DETAILS_VTABLE(details
)->serialize(details
, f
);
6310 int activation_details_deserialize(const char *key
, const char *value
, ActivationDetails
**details
) {
6320 if (!streq(key
, "activation-details-unit-type"))
6323 t
= unit_type_from_string(value
);
6327 /* The activation details vtable has defined ops only for path and timer units */
6328 if (!activation_details_vtable
[t
])
6331 *details
= malloc0(activation_details_vtable
[t
]->object_size
);
6335 **details
= (ActivationDetails
) {
6337 .trigger_unit_type
= t
,
6343 if (streq(key
, "activation-details-unit-name")) {
6344 r
= free_and_strdup(&(*details
)->trigger_unit_name
, value
);
6351 if (ACTIVATION_DETAILS_VTABLE(*details
)->deserialize
)
6352 return ACTIVATION_DETAILS_VTABLE(*details
)->deserialize(key
, value
, details
);
6357 int activation_details_append_env(ActivationDetails
*details
, char ***strv
) {
6365 if (!isempty(details
->trigger_unit_name
)) {
6366 char *s
= strjoin("TRIGGER_UNIT=", details
->trigger_unit_name
);
6370 r
= strv_consume(strv
, TAKE_PTR(s
));
6375 if (ACTIVATION_DETAILS_VTABLE(details
)->append_env
) {
6376 r
= ACTIVATION_DETAILS_VTABLE(details
)->append_env(details
, strv
);
6381 return r
+ !isempty(details
->trigger_unit_name
); /* Return the number of variables added to the env block */
6384 int activation_details_append_pair(ActivationDetails
*details
, char ***strv
) {
6392 if (!isempty(details
->trigger_unit_name
)) {
6393 r
= strv_extend(strv
, "trigger_unit");
6397 r
= strv_extend(strv
, details
->trigger_unit_name
);
6402 if (ACTIVATION_DETAILS_VTABLE(details
)->append_env
) {
6403 r
= ACTIVATION_DETAILS_VTABLE(details
)->append_pair(details
, strv
);
6408 return r
+ !isempty(details
->trigger_unit_name
); /* Return the number of pairs added to the strv */
6411 DEFINE_TRIVIAL_REF_UNREF_FUNC(ActivationDetails
, activation_details
, activation_details_free
);