1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
9 #include "sd-messages.h"
11 #include "all-units.h"
12 #include "alloc-util.h"
13 #include "bpf-firewall.h"
14 #include "bpf-foreign.h"
15 #include "bpf-socket-bind.h"
16 #include "bus-common-errors.h"
17 #include "bus-internal.h"
19 #include "cgroup-setup.h"
20 #include "cgroup-util.h"
22 #include "core-varlink.h"
23 #include "dbus-unit.h"
28 #include "exec-credential.h"
31 #include "fileio-label.h"
33 #include "format-util.h"
34 #include "id128-util.h"
36 #include "iovec-util.h"
37 #include "label-util.h"
38 #include "load-dropin.h"
39 #include "load-fragment.h"
41 #include "logarithm.h"
43 #include "mkdir-label.h"
44 #include "path-util.h"
45 #include "process-util.h"
47 #include "serialize.h"
49 #include "signal-util.h"
50 #include "sparse-endian.h"
52 #include "specifier.h"
53 #include "stat-util.h"
54 #include "stdio-util.h"
55 #include "string-table.h"
56 #include "string-util.h"
58 #include "terminal-util.h"
59 #include "tmpfile-util.h"
60 #include "umask-util.h"
61 #include "unit-name.h"
63 #include "user-util.h"
69 /* Thresholds for logging at INFO level about resource consumption */
70 #define MENTIONWORTHY_CPU_NSEC (1 * NSEC_PER_SEC)
71 #define MENTIONWORTHY_MEMORY_BYTES (64 * U64_MB)
72 #define MENTIONWORTHY_IO_BYTES (1 * U64_MB)
73 #define MENTIONWORTHY_IP_BYTES UINT64_C(0)
75 /* Thresholds for logging at NOTICE level about resource consumption */
76 #define NOTICEWORTHY_CPU_NSEC (10 * NSEC_PER_MINUTE)
77 #define NOTICEWORTHY_MEMORY_BYTES (512 * U64_MB)
78 #define NOTICEWORTHY_IO_BYTES (10 * U64_MB)
79 #define NOTICEWORTHY_IP_BYTES (128 * U64_MB)
81 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
82 [UNIT_SERVICE
] = &service_vtable
,
83 [UNIT_SOCKET
] = &socket_vtable
,
84 [UNIT_TARGET
] = &target_vtable
,
85 [UNIT_DEVICE
] = &device_vtable
,
86 [UNIT_MOUNT
] = &mount_vtable
,
87 [UNIT_AUTOMOUNT
] = &automount_vtable
,
88 [UNIT_SWAP
] = &swap_vtable
,
89 [UNIT_TIMER
] = &timer_vtable
,
90 [UNIT_PATH
] = &path_vtable
,
91 [UNIT_SLICE
] = &slice_vtable
,
92 [UNIT_SCOPE
] = &scope_vtable
,
95 Unit
* unit_new(Manager
*m
, size_t size
) {
99 assert(size
>= sizeof(Unit
));
106 u
->type
= _UNIT_TYPE_INVALID
;
107 u
->default_dependencies
= true;
108 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
109 u
->unit_file_preset
= -1;
110 u
->on_failure_job_mode
= JOB_REPLACE
;
111 u
->on_success_job_mode
= JOB_FAIL
;
112 u
->cgroup_control_inotify_wd
= -1;
113 u
->cgroup_memory_inotify_wd
= -1;
114 u
->job_timeout
= USEC_INFINITY
;
115 u
->job_running_timeout
= USEC_INFINITY
;
116 u
->ref_uid
= UID_INVALID
;
117 u
->ref_gid
= GID_INVALID
;
118 u
->cpu_usage_last
= NSEC_INFINITY
;
120 unit_reset_memory_accounting_last(u
);
122 unit_reset_io_accounting_last(u
);
124 u
->cgroup_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
125 u
->failure_action_exit_status
= u
->success_action_exit_status
= -1;
127 u
->ip_accounting_ingress_map_fd
= -EBADF
;
128 u
->ip_accounting_egress_map_fd
= -EBADF
;
130 u
->ipv4_allow_map_fd
= -EBADF
;
131 u
->ipv6_allow_map_fd
= -EBADF
;
132 u
->ipv4_deny_map_fd
= -EBADF
;
133 u
->ipv6_deny_map_fd
= -EBADF
;
135 u
->last_section_private
= -1;
137 u
->start_ratelimit
= (const RateLimit
) {
138 m
->defaults
.start_limit_interval
,
139 m
->defaults
.start_limit_burst
,
142 u
->auto_start_stop_ratelimit
= (const RateLimit
) { .interval
= 10 * USEC_PER_SEC
, .burst
= 16 };
147 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
148 _cleanup_(unit_freep
) Unit
*u
= NULL
;
151 u
= unit_new(m
, size
);
155 r
= unit_add_name(u
, name
);
164 bool unit_has_name(const Unit
*u
, const char *name
) {
168 return streq_ptr(name
, u
->id
) ||
169 set_contains(u
->aliases
, name
);
172 static void unit_init(Unit
*u
) {
179 assert(u
->type
>= 0);
181 cc
= unit_get_cgroup_context(u
);
183 cgroup_context_init(cc
);
185 /* Copy in the manager defaults into the cgroup
186 * context, _before_ the rest of the settings have
187 * been initialized */
189 cc
->cpu_accounting
= u
->manager
->defaults
.cpu_accounting
;
190 cc
->io_accounting
= u
->manager
->defaults
.io_accounting
;
191 cc
->blockio_accounting
= u
->manager
->defaults
.blockio_accounting
;
192 cc
->memory_accounting
= u
->manager
->defaults
.memory_accounting
;
193 cc
->tasks_accounting
= u
->manager
->defaults
.tasks_accounting
;
194 cc
->ip_accounting
= u
->manager
->defaults
.ip_accounting
;
196 if (u
->type
!= UNIT_SLICE
)
197 cc
->tasks_max
= u
->manager
->defaults
.tasks_max
;
199 cc
->memory_pressure_watch
= u
->manager
->defaults
.memory_pressure_watch
;
200 cc
->memory_pressure_threshold_usec
= u
->manager
->defaults
.memory_pressure_threshold_usec
;
203 ec
= unit_get_exec_context(u
);
205 exec_context_init(ec
);
207 if (u
->manager
->defaults
.oom_score_adjust_set
) {
208 ec
->oom_score_adjust
= u
->manager
->defaults
.oom_score_adjust
;
209 ec
->oom_score_adjust_set
= true;
212 if (MANAGER_IS_SYSTEM(u
->manager
))
213 ec
->keyring_mode
= EXEC_KEYRING_SHARED
;
215 ec
->keyring_mode
= EXEC_KEYRING_INHERIT
;
217 /* User manager might have its umask redefined by PAM or UMask=. In this
218 * case let the units it manages inherit this value by default. They can
219 * still tune this value through their own unit file */
220 (void) get_process_umask(0, &ec
->umask
);
224 kc
= unit_get_kill_context(u
);
226 kill_context_init(kc
);
228 if (UNIT_VTABLE(u
)->init
)
229 UNIT_VTABLE(u
)->init(u
);
232 static int unit_add_alias(Unit
*u
, char *donated_name
) {
235 /* Make sure that u->names is allocated. We may leave u->names
236 * empty if we fail later, but this is not a problem. */
237 r
= set_ensure_put(&u
->aliases
, &string_hash_ops
, donated_name
);
245 int unit_add_name(Unit
*u
, const char *text
) {
246 _cleanup_free_
char *name
= NULL
, *instance
= NULL
;
253 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
255 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
256 "instance is not set when adding name '%s': %m", text
);
258 r
= unit_name_replace_instance(text
, u
->instance
, &name
);
260 return log_unit_debug_errno(u
, r
,
261 "failed to build instance name from '%s': %m", text
);
268 if (unit_has_name(u
, name
))
271 if (hashmap_contains(u
->manager
->units
, name
))
272 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
273 "unit already exist when adding name '%s': %m", name
);
275 if (!unit_name_is_valid(name
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
276 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
277 "name '%s' is invalid: %m", name
);
279 t
= unit_name_to_type(name
);
281 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
282 "failed to derive unit type from name '%s': %m", name
);
284 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
285 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
286 "unit type is illegal: u->type(%d) and t(%d) for name '%s': %m",
289 r
= unit_name_to_instance(name
, &instance
);
291 return log_unit_debug_errno(u
, r
, "failed to extract instance from name '%s': %m", name
);
293 if (instance
&& !unit_type_may_template(t
))
294 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
), "templates are not allowed for name '%s': %m", name
);
296 /* Ensure that this unit either has no instance, or that the instance matches. */
297 if (u
->type
!= _UNIT_TYPE_INVALID
&& !streq_ptr(u
->instance
, instance
))
298 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
299 "cannot add name %s, the instances don't match (\"%s\" != \"%s\").",
300 name
, instance
, u
->instance
);
302 if (u
->id
&& !unit_type_may_alias(t
))
303 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
304 "cannot add name %s, aliases are not allowed for %s units.",
305 name
, unit_type_to_string(t
));
307 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
308 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(E2BIG
), "cannot add name, manager has too many units: %m");
310 /* Add name to the global hashmap first, because that's easier to undo */
311 r
= hashmap_put(u
->manager
->units
, name
, u
);
313 return log_unit_debug_errno(u
, r
, "add unit to hashmap failed for name '%s': %m", text
);
316 r
= unit_add_alias(u
, name
); /* unit_add_alias() takes ownership of the name on success */
318 hashmap_remove(u
->manager
->units
, name
);
324 /* A new name, we don't need the set yet. */
325 assert(u
->type
== _UNIT_TYPE_INVALID
);
326 assert(!u
->instance
);
329 u
->id
= TAKE_PTR(name
);
330 u
->instance
= TAKE_PTR(instance
);
332 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
336 unit_add_to_dbus_queue(u
);
340 int unit_choose_id(Unit
*u
, const char *name
) {
341 _cleanup_free_
char *t
= NULL
;
348 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
352 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
359 if (streq_ptr(u
->id
, name
))
360 return 0; /* Nothing to do. */
362 /* Selects one of the aliases of this unit as the id */
363 s
= set_get(u
->aliases
, (char*) name
);
368 r
= set_remove_and_put(u
->aliases
, name
, u
->id
);
372 assert_se(set_remove(u
->aliases
, name
)); /* see set_get() above… */
374 u
->id
= s
; /* Old u->id is now stored in the set, and s is not stored anywhere */
375 unit_add_to_dbus_queue(u
);
380 int unit_set_description(Unit
*u
, const char *description
) {
385 r
= free_and_strdup(&u
->description
, empty_to_null(description
));
389 unit_add_to_dbus_queue(u
);
394 static bool unit_success_failure_handler_has_jobs(Unit
*unit
) {
397 UNIT_FOREACH_DEPENDENCY(other
, unit
, UNIT_ATOM_ON_SUCCESS
)
398 if (other
->job
|| other
->nop_job
)
401 UNIT_FOREACH_DEPENDENCY(other
, unit
, UNIT_ATOM_ON_FAILURE
)
402 if (other
->job
|| other
->nop_job
)
408 void unit_release_resources(Unit
*u
) {
409 UnitActiveState state
;
414 if (u
->job
|| u
->nop_job
)
420 state
= unit_active_state(u
);
421 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
424 if (unit_will_restart(u
))
427 ec
= unit_get_exec_context(u
);
428 if (ec
&& ec
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
)
429 exec_context_destroy_runtime_directory(ec
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
431 if (UNIT_VTABLE(u
)->release_resources
)
432 UNIT_VTABLE(u
)->release_resources(u
);
435 bool unit_may_gc(Unit
*u
) {
436 UnitActiveState state
;
441 /* Checks whether the unit is ready to be unloaded for garbage collection. Returns true when the
442 * unit may be collected, and false if there's some reason to keep it loaded.
444 * References from other units are *not* checked here. Instead, this is done in unit_gc_sweep(), but
445 * using markers to properly collect dependency loops.
448 if (u
->job
|| u
->nop_job
)
454 /* if we saw a cgroup empty event for this unit, stay around until we processed it so that we remove
455 * the empty cgroup if possible. Similar, process any pending OOM events if they are already queued
456 * before we release the unit. */
457 if (u
->in_cgroup_empty_queue
|| u
->in_cgroup_oom_queue
)
460 /* Make sure to send out D-Bus events before we unload the unit */
461 if (u
->in_dbus_queue
)
464 if (sd_bus_track_count(u
->bus_track
) > 0)
467 state
= unit_active_state(u
);
469 /* But we keep the unit object around for longer when it is referenced or configured to not be
471 switch (u
->collect_mode
) {
473 case COLLECT_INACTIVE
:
474 if (state
!= UNIT_INACTIVE
)
479 case COLLECT_INACTIVE_OR_FAILED
:
480 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
486 assert_not_reached();
489 /* Check if any OnFailure= or on Success= jobs may be pending */
490 if (unit_success_failure_handler_has_jobs(u
))
493 if (u
->cgroup_path
) {
494 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
495 * around. Units with active processes should never be collected. */
497 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
499 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", empty_to_root(u
->cgroup_path
));
504 if (!UNIT_VTABLE(u
)->may_gc
)
507 return UNIT_VTABLE(u
)->may_gc(u
);
510 void unit_add_to_load_queue(Unit
*u
) {
512 assert(u
->type
!= _UNIT_TYPE_INVALID
);
514 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
517 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
518 u
->in_load_queue
= true;
521 void unit_add_to_cleanup_queue(Unit
*u
) {
524 if (u
->in_cleanup_queue
)
527 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
528 u
->in_cleanup_queue
= true;
531 void unit_add_to_gc_queue(Unit
*u
) {
534 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
540 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
541 u
->in_gc_queue
= true;
544 void unit_add_to_dbus_queue(Unit
*u
) {
546 assert(u
->type
!= _UNIT_TYPE_INVALID
);
548 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
551 /* Shortcut things if nobody cares */
552 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
553 sd_bus_track_count(u
->bus_track
) <= 0 &&
554 set_isempty(u
->manager
->private_buses
)) {
555 u
->sent_dbus_new_signal
= true;
559 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
560 u
->in_dbus_queue
= true;
563 void unit_submit_to_stop_when_unneeded_queue(Unit
*u
) {
566 if (u
->in_stop_when_unneeded_queue
)
569 if (!u
->stop_when_unneeded
)
572 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
575 LIST_PREPEND(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
576 u
->in_stop_when_unneeded_queue
= true;
579 void unit_submit_to_start_when_upheld_queue(Unit
*u
) {
582 if (u
->in_start_when_upheld_queue
)
585 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)))
588 if (!unit_has_dependency(u
, UNIT_ATOM_START_STEADILY
, NULL
))
591 LIST_PREPEND(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
592 u
->in_start_when_upheld_queue
= true;
595 void unit_submit_to_stop_when_bound_queue(Unit
*u
) {
598 if (u
->in_stop_when_bound_queue
)
601 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
604 if (!unit_has_dependency(u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
, NULL
))
607 LIST_PREPEND(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
608 u
->in_stop_when_bound_queue
= true;
611 static bool unit_can_release_resources(Unit
*u
) {
616 if (UNIT_VTABLE(u
)->release_resources
)
619 ec
= unit_get_exec_context(u
);
620 if (ec
&& ec
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
)
626 void unit_submit_to_release_resources_queue(Unit
*u
) {
629 if (u
->in_release_resources_queue
)
632 if (u
->job
|| u
->nop_job
)
638 if (!unit_can_release_resources(u
))
641 LIST_PREPEND(release_resources_queue
, u
->manager
->release_resources_queue
, u
);
642 u
->in_release_resources_queue
= true;
645 static void unit_clear_dependencies(Unit
*u
) {
648 /* Removes all dependencies configured on u and their reverse dependencies. */
650 for (Hashmap
*deps
; (deps
= hashmap_steal_first(u
->dependencies
));) {
652 for (Unit
*other
; (other
= hashmap_steal_first_key(deps
));) {
655 HASHMAP_FOREACH(other_deps
, other
->dependencies
)
656 hashmap_remove(other_deps
, u
);
658 unit_add_to_gc_queue(other
);
664 u
->dependencies
= hashmap_free(u
->dependencies
);
667 static void unit_remove_transient(Unit
*u
) {
673 if (u
->fragment_path
)
674 (void) unlink(u
->fragment_path
);
676 STRV_FOREACH(i
, u
->dropin_paths
) {
677 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
679 if (path_extract_directory(*i
, &p
) < 0) /* Get the drop-in directory from the drop-in file */
682 if (path_extract_directory(p
, &pp
) < 0) /* Get the config directory from the drop-in directory */
685 /* Only drop transient drop-ins */
686 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
694 static void unit_free_mounts_for(Unit
*u
) {
697 for (UnitMountDependencyType t
= 0; t
< _UNIT_MOUNT_DEPENDENCY_TYPE_MAX
; ++t
) {
699 _cleanup_free_
char *path
= NULL
;
701 path
= hashmap_steal_first_key(u
->mounts_for
[t
]);
705 char s
[strlen(path
) + 1];
707 PATH_FOREACH_PREFIX_MORE(s
, path
) {
711 x
= hashmap_get2(u
->manager
->units_needing_mounts_for
[t
], s
, (void**) &y
);
715 (void) set_remove(x
, u
);
717 if (set_isempty(x
)) {
718 assert_se(hashmap_remove(u
->manager
->units_needing_mounts_for
[t
], y
));
725 u
->mounts_for
[t
] = hashmap_free(u
->mounts_for
[t
]);
729 static void unit_done(Unit
*u
) {
738 if (UNIT_VTABLE(u
)->done
)
739 UNIT_VTABLE(u
)->done(u
);
741 ec
= unit_get_exec_context(u
);
743 exec_context_done(ec
);
745 cc
= unit_get_cgroup_context(u
);
747 cgroup_context_done(cc
);
750 Unit
* unit_free(Unit
*u
) {
757 sd_event_source_disable_unref(u
->auto_start_stop_event_source
);
759 u
->transient_file
= safe_fclose(u
->transient_file
);
761 if (!MANAGER_IS_RELOADING(u
->manager
))
762 unit_remove_transient(u
);
764 bus_unit_send_removed_signal(u
);
768 unit_dequeue_rewatch_pids(u
);
770 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
771 u
->bus_track
= sd_bus_track_unref(u
->bus_track
);
772 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
773 u
->pending_freezer_invocation
= sd_bus_message_unref(u
->pending_freezer_invocation
);
775 unit_free_mounts_for(u
);
777 SET_FOREACH(t
, u
->aliases
)
778 hashmap_remove_value(u
->manager
->units
, t
, u
);
780 hashmap_remove_value(u
->manager
->units
, u
->id
, u
);
782 if (!sd_id128_is_null(u
->invocation_id
))
783 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
797 /* A unit is being dropped from the tree, make sure our family is realized properly. Do this after we
798 * detach the unit from slice tree in order to eliminate its effect on controller masks. */
799 slice
= UNIT_GET_SLICE(u
);
800 unit_clear_dependencies(u
);
802 unit_add_family_to_cgroup_realize_queue(slice
);
805 manager_unref_console(u
->manager
);
807 fdset_free(u
->initial_socket_bind_link_fds
);
809 bpf_link_free(u
->ipv4_socket_bind_link
);
810 bpf_link_free(u
->ipv6_socket_bind_link
);
813 unit_release_cgroup(u
);
815 if (!MANAGER_IS_RELOADING(u
->manager
))
816 unit_unlink_state_files(u
);
818 unit_unref_uid_gid(u
, false);
820 (void) manager_update_failed_units(u
->manager
, u
, false);
821 set_remove(u
->manager
->startup_units
, u
);
823 unit_unwatch_all_pids(u
);
825 while (u
->refs_by_target
)
826 unit_ref_unset(u
->refs_by_target
);
828 if (u
->type
!= _UNIT_TYPE_INVALID
)
829 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
831 if (u
->in_load_queue
)
832 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
834 if (u
->in_dbus_queue
)
835 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
837 if (u
->in_cleanup_queue
)
838 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
841 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
843 if (u
->in_cgroup_realize_queue
)
844 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
846 if (u
->in_cgroup_empty_queue
)
847 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
849 if (u
->in_cgroup_oom_queue
)
850 LIST_REMOVE(cgroup_oom_queue
, u
->manager
->cgroup_oom_queue
, u
);
852 if (u
->in_target_deps_queue
)
853 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
855 if (u
->in_stop_when_unneeded_queue
)
856 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
858 if (u
->in_start_when_upheld_queue
)
859 LIST_REMOVE(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
861 if (u
->in_stop_when_bound_queue
)
862 LIST_REMOVE(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
864 if (u
->in_release_resources_queue
)
865 LIST_REMOVE(release_resources_queue
, u
->manager
->release_resources_queue
, u
);
867 bpf_firewall_close(u
);
869 hashmap_free(u
->bpf_foreign_by_key
);
871 bpf_program_free(u
->bpf_device_control_installed
);
874 bpf_link_free(u
->restrict_ifaces_ingress_bpf_link
);
875 bpf_link_free(u
->restrict_ifaces_egress_bpf_link
);
877 fdset_free(u
->initial_restric_ifaces_link_fds
);
879 condition_free_list(u
->conditions
);
880 condition_free_list(u
->asserts
);
882 free(u
->description
);
883 strv_free(u
->documentation
);
884 free(u
->fragment_path
);
885 free(u
->source_path
);
886 strv_free(u
->dropin_paths
);
889 free(u
->job_timeout_reboot_arg
);
892 free(u
->access_selinux_context
);
894 set_free_free(u
->aliases
);
897 activation_details_unref(u
->activation_details
);
902 FreezerState
unit_freezer_state(Unit
*u
) {
905 return u
->freezer_state
;
908 int unit_freezer_state_kernel(Unit
*u
, FreezerState
*ret
) {
909 char *values
[1] = {};
914 r
= cg_get_keyed_attribute(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events",
915 STRV_MAKE("frozen"), values
);
919 r
= _FREEZER_STATE_INVALID
;
922 if (streq(values
[0], "0"))
924 else if (streq(values
[0], "1"))
934 UnitActiveState
unit_active_state(Unit
*u
) {
937 if (u
->load_state
== UNIT_MERGED
)
938 return unit_active_state(unit_follow_merge(u
));
940 /* After a reload it might happen that a unit is not correctly
941 * loaded but still has a process around. That's why we won't
942 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
944 return UNIT_VTABLE(u
)->active_state(u
);
947 const char* unit_sub_state_to_string(Unit
*u
) {
950 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
953 static int unit_merge_names(Unit
*u
, Unit
*other
) {
960 r
= unit_add_alias(u
, other
->id
);
964 r
= set_move(u
->aliases
, other
->aliases
);
966 set_remove(u
->aliases
, other
->id
);
971 other
->aliases
= set_free_free(other
->aliases
);
973 SET_FOREACH(name
, u
->aliases
)
974 assert_se(hashmap_replace(u
->manager
->units
, name
, u
) == 0);
979 static int unit_reserve_dependencies(Unit
*u
, Unit
*other
) {
988 /* Let's reserve some space in the dependency hashmaps so that later on merging the units cannot
991 * First make some room in the per dependency type hashmaps. Using the summed size of both units'
992 * hashmaps is an estimate that is likely too high since they probably use some of the same
993 * types. But it's never too low, and that's all we need. */
995 n_reserve
= MIN(hashmap_size(other
->dependencies
), LESS_BY((size_t) _UNIT_DEPENDENCY_MAX
, hashmap_size(u
->dependencies
)));
997 r
= hashmap_ensure_allocated(&u
->dependencies
, NULL
);
1001 r
= hashmap_reserve(u
->dependencies
, n_reserve
);
1006 /* Now, enlarge our per dependency type hashmaps by the number of entries in the same hashmap of the
1007 * other unit's dependencies.
1009 * NB: If u does not have a dependency set allocated for some dependency type, there is no need to
1010 * reserve anything for. In that case other's set will be transferred as a whole to u by
1011 * complete_move(). */
1013 HASHMAP_FOREACH_KEY(deps
, d
, u
->dependencies
) {
1014 Hashmap
*other_deps
;
1016 other_deps
= hashmap_get(other
->dependencies
, d
);
1018 r
= hashmap_reserve(deps
, hashmap_size(other_deps
));
1026 static bool unit_should_warn_about_dependency(UnitDependency dependency
) {
1027 /* Only warn about some unit types */
1028 return IN_SET(dependency
,
1039 static int unit_per_dependency_type_hashmap_update(
1042 UnitDependencyMask origin_mask
,
1043 UnitDependencyMask destination_mask
) {
1045 UnitDependencyInfo info
;
1049 assert_cc(sizeof(void*) == sizeof(info
));
1051 /* Acquire the UnitDependencyInfo entry for the Unit* we are interested in, and update it if it
1052 * exists, or insert it anew if not. */
1054 info
.data
= hashmap_get(per_type
, other
);
1056 /* Entry already exists. Add in our mask. */
1058 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
1059 FLAGS_SET(destination_mask
, info
.destination_mask
))
1062 info
.origin_mask
|= origin_mask
;
1063 info
.destination_mask
|= destination_mask
;
1065 r
= hashmap_update(per_type
, other
, info
.data
);
1067 info
= (UnitDependencyInfo
) {
1068 .origin_mask
= origin_mask
,
1069 .destination_mask
= destination_mask
,
1072 r
= hashmap_put(per_type
, other
, info
.data
);
1080 static void unit_merge_dependencies(Unit
*u
, Unit
*other
) {
1082 void *dt
; /* Actually of type UnitDependency, except that we don't bother casting it here,
1083 * since the hashmaps all want it as void pointer. */
1091 /* First, remove dependency to other. */
1092 HASHMAP_FOREACH_KEY(deps
, dt
, u
->dependencies
) {
1093 if (hashmap_remove(deps
, other
) && unit_should_warn_about_dependency(UNIT_DEPENDENCY_FROM_PTR(dt
)))
1094 log_unit_warning(u
, "Dependency %s=%s is dropped, as %s is merged into %s.",
1095 unit_dependency_to_string(UNIT_DEPENDENCY_FROM_PTR(dt
)),
1096 other
->id
, other
->id
, u
->id
);
1098 if (hashmap_isempty(deps
))
1099 hashmap_free(hashmap_remove(u
->dependencies
, dt
));
1103 _cleanup_hashmap_free_ Hashmap
*other_deps
= NULL
;
1104 UnitDependencyInfo di_back
;
1107 /* Let's focus on one dependency type at a time, that 'other' has defined. */
1108 other_deps
= hashmap_steal_first_key_and_value(other
->dependencies
, &dt
);
1112 deps
= hashmap_get(u
->dependencies
, dt
);
1114 /* Now iterate through all dependencies of this dependency type, of 'other'. We refer to the
1115 * referenced units as 'back'. */
1116 HASHMAP_FOREACH_KEY(di_back
.data
, back
, other_deps
) {
1121 /* This is a dependency pointing back to the unit we want to merge with?
1122 * Suppress it (but warn) */
1123 if (unit_should_warn_about_dependency(UNIT_DEPENDENCY_FROM_PTR(dt
)))
1124 log_unit_warning(u
, "Dependency %s=%s in %s is dropped, as %s is merged into %s.",
1125 unit_dependency_to_string(UNIT_DEPENDENCY_FROM_PTR(dt
)),
1126 u
->id
, other
->id
, other
->id
, u
->id
);
1128 hashmap_remove(other_deps
, back
);
1132 /* Now iterate through all deps of 'back', and fix the ones pointing to 'other' to
1133 * point to 'u' instead. */
1134 HASHMAP_FOREACH_KEY(back_deps
, back_dt
, back
->dependencies
) {
1135 UnitDependencyInfo di_move
;
1137 di_move
.data
= hashmap_remove(back_deps
, other
);
1141 assert_se(unit_per_dependency_type_hashmap_update(
1144 di_move
.origin_mask
,
1145 di_move
.destination_mask
) >= 0);
1148 /* The target unit already has dependencies of this type, let's then merge this individually. */
1150 assert_se(unit_per_dependency_type_hashmap_update(
1153 di_back
.origin_mask
,
1154 di_back
.destination_mask
) >= 0);
1157 /* Now all references towards 'other' of the current type 'dt' are corrected to point to 'u'.
1158 * Lets's now move the deps of type 'dt' from 'other' to 'u'. If the unit does not have
1159 * dependencies of this type, let's move them per type wholesale. */
1161 assert_se(hashmap_put(u
->dependencies
, dt
, TAKE_PTR(other_deps
)) >= 0);
1164 other
->dependencies
= hashmap_free(other
->dependencies
);
1167 int unit_merge(Unit
*u
, Unit
*other
) {
1172 assert(u
->manager
== other
->manager
);
1173 assert(u
->type
!= _UNIT_TYPE_INVALID
);
1175 other
= unit_follow_merge(other
);
1180 if (u
->type
!= other
->type
)
1183 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
1186 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
1189 if (!streq_ptr(u
->instance
, other
->instance
))
1198 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1201 /* Make reservations to ensure merge_dependencies() won't fail. We don't rollback reservations if we
1202 * fail. We don't have a way to undo reservations. A reservation is not a leak. */
1203 r
= unit_reserve_dependencies(u
, other
);
1207 /* Redirect all references */
1208 while (other
->refs_by_target
)
1209 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
1211 /* Merge dependencies */
1212 unit_merge_dependencies(u
, other
);
1214 /* Merge names. It is better to do that after merging deps, otherwise the log message contains n/a. */
1215 r
= unit_merge_names(u
, other
);
1219 other
->load_state
= UNIT_MERGED
;
1220 other
->merged_into
= u
;
1222 if (!u
->activation_details
)
1223 u
->activation_details
= activation_details_ref(other
->activation_details
);
1225 /* If there is still some data attached to the other node, we
1226 * don't need it anymore, and can free it. */
1227 if (other
->load_state
!= UNIT_STUB
)
1228 if (UNIT_VTABLE(other
)->done
)
1229 UNIT_VTABLE(other
)->done(other
);
1231 unit_add_to_dbus_queue(u
);
1232 unit_add_to_cleanup_queue(other
);
1237 int unit_merge_by_name(Unit
*u
, const char *name
) {
1238 _cleanup_free_
char *s
= NULL
;
1242 /* Either add name to u, or if a unit with name already exists, merge it with u.
1243 * If name is a template, do the same for name@instance, where instance is u's instance. */
1248 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
1252 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
1259 other
= manager_get_unit(u
->manager
, name
);
1261 return unit_merge(u
, other
);
1263 return unit_add_name(u
, name
);
1266 Unit
* unit_follow_merge(Unit
*u
) {
1269 while (u
->load_state
== UNIT_MERGED
)
1270 assert_se(u
= u
->merged_into
);
1275 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
1281 /* Unlike unit_add_dependency() or friends, this always returns 0 on success. */
1283 if (c
->working_directory
) {
1284 r
= unit_add_mounts_for(
1286 c
->working_directory
,
1287 UNIT_DEPENDENCY_FILE
,
1288 c
->working_directory_missing_ok
? UNIT_MOUNT_WANTS
: UNIT_MOUNT_REQUIRES
);
1293 if (c
->root_directory
) {
1294 r
= unit_add_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
, UNIT_MOUNT_WANTS
);
1299 if (c
->root_image
) {
1300 r
= unit_add_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
, UNIT_MOUNT_WANTS
);
1305 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
1306 if (!u
->manager
->prefix
[dt
])
1309 for (size_t i
= 0; i
< c
->directories
[dt
].n_items
; i
++) {
1310 _cleanup_free_
char *p
= NULL
;
1312 p
= path_join(u
->manager
->prefix
[dt
], c
->directories
[dt
].items
[i
].path
);
1316 r
= unit_add_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
, UNIT_MOUNT_REQUIRES
);
1322 if (!MANAGER_IS_SYSTEM(u
->manager
))
1325 /* For the following three directory types we need write access, and /var/ is possibly on the root
1326 * fs. Hence order after systemd-remount-fs.service, to ensure things are writable. */
1327 if (c
->directories
[EXEC_DIRECTORY_STATE
].n_items
> 0 ||
1328 c
->directories
[EXEC_DIRECTORY_CACHE
].n_items
> 0 ||
1329 c
->directories
[EXEC_DIRECTORY_LOGS
].n_items
> 0) {
1330 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_REMOUNT_FS_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1335 if (c
->private_tmp
) {
1336 r
= unit_add_mounts_for(u
, "/tmp", UNIT_DEPENDENCY_FILE
, UNIT_MOUNT_WANTS
);
1340 r
= unit_add_mounts_for(u
, "/var/tmp", UNIT_DEPENDENCY_FILE
, UNIT_MOUNT_WANTS
);
1344 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1349 if (c
->root_image
) {
1350 /* We need to wait for /dev/loopX to appear when doing RootImage=, hence let's add an
1351 * implicit dependency on udev */
1353 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_UDEVD_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1358 if (!IN_SET(c
->std_output
,
1359 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1360 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1361 !IN_SET(c
->std_error
,
1362 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1363 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1367 /* If syslog or kernel logging is requested (or log namespacing is), make sure our own logging daemon
1370 if (c
->log_namespace
) {
1371 _cleanup_free_
char *socket_unit
= NULL
, *varlink_socket_unit
= NULL
;
1373 r
= unit_name_build_from_type("systemd-journald", c
->log_namespace
, UNIT_SOCKET
, &socket_unit
);
1377 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1381 r
= unit_name_build_from_type("systemd-journald-varlink", c
->log_namespace
, UNIT_SOCKET
, &varlink_socket_unit
);
1385 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, varlink_socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1389 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1394 r
= unit_add_default_credential_dependencies(u
, c
);
1401 const char* unit_description(Unit
*u
) {
1405 return u
->description
;
1407 return strna(u
->id
);
1410 const char* unit_status_string(Unit
*u
, char **ret_combined_buffer
) {
1414 /* Return u->id, u->description, or "{u->id} - {u->description}".
1415 * Versions with u->description are only used if it is set.
1416 * The last option is used if configured and the caller provided the 'ret_combined_buffer'
1419 * Note that *ret_combined_buffer may be set to NULL. */
1421 if (!u
->description
||
1422 u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
||
1423 (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& !ret_combined_buffer
) ||
1424 streq(u
->description
, u
->id
)) {
1426 if (ret_combined_buffer
)
1427 *ret_combined_buffer
= NULL
;
1431 if (ret_combined_buffer
) {
1432 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
) {
1433 *ret_combined_buffer
= strjoin(u
->id
, " - ", u
->description
);
1434 if (*ret_combined_buffer
)
1435 return *ret_combined_buffer
;
1436 log_oom(); /* Fall back to ->description */
1438 *ret_combined_buffer
= NULL
;
1441 return u
->description
;
1444 /* Common implementation for multiple backends */
1445 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1450 /* Load a .{service,socket,...} file */
1451 r
= unit_load_fragment(u
);
1455 if (u
->load_state
== UNIT_STUB
) {
1456 if (fragment_required
)
1459 u
->load_state
= UNIT_LOADED
;
1462 /* Load drop-in directory data. If u is an alias, we might be reloading the
1463 * target unit needlessly. But we cannot be sure which drops-ins have already
1464 * been loaded and which not, at least without doing complicated book-keeping,
1465 * so let's always reread all drop-ins. */
1466 r
= unit_load_dropin(unit_follow_merge(u
));
1470 if (u
->source_path
) {
1473 if (stat(u
->source_path
, &st
) >= 0)
1474 u
->source_mtime
= timespec_load(&st
.st_mtim
);
1476 u
->source_mtime
= 0;
1482 void unit_add_to_target_deps_queue(Unit
*u
) {
1483 Manager
*m
= ASSERT_PTR(ASSERT_PTR(u
)->manager
);
1485 if (u
->in_target_deps_queue
)
1488 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1489 u
->in_target_deps_queue
= true;
1492 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1496 if (target
->type
!= UNIT_TARGET
)
1499 /* Only add the dependency if both units are loaded, so that
1500 * that loop check below is reliable */
1501 if (u
->load_state
!= UNIT_LOADED
||
1502 target
->load_state
!= UNIT_LOADED
)
1505 /* If either side wants no automatic dependencies, then let's
1507 if (!u
->default_dependencies
||
1508 !target
->default_dependencies
)
1511 /* Don't create loops */
1512 if (unit_has_dependency(target
, UNIT_ATOM_BEFORE
, u
))
1515 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1518 static int unit_add_slice_dependencies(Unit
*u
) {
1522 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1525 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1526 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1528 UnitDependencyMask mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1530 slice
= UNIT_GET_SLICE(u
);
1532 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, slice
, true, mask
);
1534 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1537 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1540 static int unit_add_mount_dependencies(Unit
*u
) {
1541 bool changed
= false;
1546 for (UnitMountDependencyType t
= 0; t
< _UNIT_MOUNT_DEPENDENCY_TYPE_MAX
; ++t
) {
1547 UnitDependencyInfo di
;
1550 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->mounts_for
[t
]) {
1552 char prefix
[strlen(ASSERT_PTR(path
)) + 1];
1554 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1555 _cleanup_free_
char *p
= NULL
;
1558 r
= unit_name_from_path(prefix
, ".mount", &p
);
1560 continue; /* If the path cannot be converted to a mount unit name,
1561 * then it's not manageable as a unit by systemd, and
1562 * hence we don't need a dependency on it. Let's thus
1563 * silently ignore the issue. */
1567 m
= manager_get_unit(u
->manager
, p
);
1569 /* Make sure to load the mount unit if it exists. If so the
1570 * dependencies on this unit will be added later during the loading
1571 * of the mount unit. */
1572 (void) manager_load_unit_prepare(
1583 if (m
->load_state
!= UNIT_LOADED
)
1586 r
= unit_add_dependency(
1590 /* add_reference= */ true,
1594 changed
= changed
|| r
> 0;
1596 if (m
->fragment_path
) {
1597 r
= unit_add_dependency(
1599 unit_mount_dependency_type_to_dependency_type(t
),
1601 /* add_reference= */ true,
1605 changed
= changed
|| r
> 0;
1614 static int unit_add_oomd_dependencies(Unit
*u
) {
1621 if (!u
->default_dependencies
)
1624 c
= unit_get_cgroup_context(u
);
1628 bool wants_oomd
= c
->moom_swap
== MANAGED_OOM_KILL
|| c
->moom_mem_pressure
== MANAGED_OOM_KILL
;
1632 if (!cg_all_unified())
1635 r
= cg_mask_supported(&mask
);
1637 return log_debug_errno(r
, "Failed to determine supported controllers: %m");
1639 if (!FLAGS_SET(mask
, CGROUP_MASK_MEMORY
))
1642 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "systemd-oomd.service", true, UNIT_DEPENDENCY_FILE
);
1645 static int unit_add_startup_units(Unit
*u
) {
1646 if (!unit_has_startup_cgroup_constraints(u
))
1649 return set_ensure_put(&u
->manager
->startup_units
, NULL
, u
);
1652 static int unit_validate_on_failure_job_mode(
1654 const char *job_mode_setting
,
1656 const char *dependency_name
,
1657 UnitDependencyAtom atom
) {
1659 Unit
*other
, *found
= NULL
;
1661 if (job_mode
!= JOB_ISOLATE
)
1664 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
1667 else if (found
!= other
)
1668 return log_unit_error_errno(
1669 u
, SYNTHETIC_ERRNO(ENOEXEC
),
1670 "More than one %s dependencies specified but %sisolate set. Refusing.",
1671 dependency_name
, job_mode_setting
);
1677 int unit_load(Unit
*u
) {
1682 if (u
->in_load_queue
) {
1683 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1684 u
->in_load_queue
= false;
1687 if (u
->type
== _UNIT_TYPE_INVALID
)
1690 if (u
->load_state
!= UNIT_STUB
)
1693 if (u
->transient_file
) {
1694 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1695 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1697 r
= fflush_and_check(u
->transient_file
);
1701 u
->transient_file
= safe_fclose(u
->transient_file
);
1702 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1705 r
= UNIT_VTABLE(u
)->load(u
);
1709 assert(u
->load_state
!= UNIT_STUB
);
1711 if (u
->load_state
== UNIT_LOADED
) {
1712 unit_add_to_target_deps_queue(u
);
1714 r
= unit_add_slice_dependencies(u
);
1718 r
= unit_add_mount_dependencies(u
);
1722 r
= unit_add_oomd_dependencies(u
);
1726 r
= unit_add_startup_units(u
);
1730 r
= unit_validate_on_failure_job_mode(u
, "OnSuccessJobMode=", u
->on_success_job_mode
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
);
1734 r
= unit_validate_on_failure_job_mode(u
, "OnFailureJobMode=", u
->on_failure_job_mode
, "OnFailure=", UNIT_ATOM_ON_FAILURE
);
1738 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1739 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1741 /* We finished loading, let's ensure our parents recalculate the members mask */
1742 unit_invalidate_cgroup_members_masks(u
);
1745 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1747 unit_add_to_dbus_queue(unit_follow_merge(u
));
1748 unit_add_to_gc_queue(u
);
1749 (void) manager_varlink_send_managed_oom_update(u
);
1754 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code
1755 * should hence return ENOEXEC to ensure units are placed in this state after loading. */
1757 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1758 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1762 /* Record the timestamp on the cache, so that if the cache gets updated between now and the next time
1763 * an attempt is made to load this unit, we know we need to check again. */
1764 if (u
->load_state
== UNIT_NOT_FOUND
)
1765 u
->fragment_not_found_timestamp_hash
= u
->manager
->unit_cache_timestamp_hash
;
1767 unit_add_to_dbus_queue(u
);
1768 unit_add_to_gc_queue(u
);
1770 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1774 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1779 if (u
&& !unit_log_level_test(u
, level
))
1780 return -ERRNO_VALUE(error
);
1782 va_start(ap
, format
);
1784 r
= log_object_internalv(level
, error
, file
, line
, func
,
1785 u
->manager
->unit_log_field
,
1787 u
->manager
->invocation_log_field
,
1788 u
->invocation_id_string
,
1791 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1797 static bool unit_test_condition(Unit
*u
) {
1798 _cleanup_strv_free_
char **env
= NULL
;
1803 dual_timestamp_now(&u
->condition_timestamp
);
1805 r
= manager_get_effective_environment(u
->manager
, &env
);
1807 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1808 u
->condition_result
= true;
1810 u
->condition_result
= condition_test_list(
1813 condition_type_to_string
,
1817 unit_add_to_dbus_queue(u
);
1818 return u
->condition_result
;
1821 static bool unit_test_assert(Unit
*u
) {
1822 _cleanup_strv_free_
char **env
= NULL
;
1827 dual_timestamp_now(&u
->assert_timestamp
);
1829 r
= manager_get_effective_environment(u
->manager
, &env
);
1831 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1832 u
->assert_result
= CONDITION_ERROR
;
1834 u
->assert_result
= condition_test_list(
1837 assert_type_to_string
,
1841 unit_add_to_dbus_queue(u
);
1842 return u
->assert_result
;
1845 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *format
, const char *ident
) {
1846 if (log_get_show_color()) {
1847 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& strchr(ident
, ' '))
1848 ident
= strjoina(ANSI_HIGHLIGHT
, u
->id
, ANSI_NORMAL
, " - ", u
->description
);
1850 ident
= strjoina(ANSI_HIGHLIGHT
, ident
, ANSI_NORMAL
);
1853 DISABLE_WARNING_FORMAT_NONLITERAL
;
1854 manager_status_printf(u
->manager
, status_type
, status
, format
, ident
);
1858 int unit_test_start_limit(Unit
*u
) {
1863 if (ratelimit_below(&u
->start_ratelimit
)) {
1864 u
->start_limit_hit
= false;
1868 log_unit_warning(u
, "Start request repeated too quickly.");
1869 u
->start_limit_hit
= true;
1871 reason
= strjoina("unit ", u
->id
, " failed");
1873 emergency_action(u
->manager
, u
->start_limit_action
,
1874 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1875 u
->reboot_arg
, -1, reason
);
1880 static bool unit_verify_deps(Unit
*u
) {
1885 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined
1886 * with After=. We do not check Requires= or Requisite= here as they only should have an effect on
1887 * the job processing, but do not have any effect afterwards. We don't check BindsTo= dependencies
1888 * that are not used in conjunction with After= as for them any such check would make things entirely
1891 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
1893 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
))
1896 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1897 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1905 /* Errors that aren't really errors:
1906 * -EALREADY: Unit is already started.
1907 * -ECOMM: Condition failed
1908 * -EAGAIN: An operation is already in progress. Retry later.
1910 * Errors that are real errors:
1911 * -EBADR: This unit type does not support starting.
1912 * -ECANCELED: Start limit hit, too many requests for now
1913 * -EPROTO: Assert failed
1914 * -EINVAL: Unit not loaded
1915 * -EOPNOTSUPP: Unit type not supported
1916 * -ENOLINK: The necessary dependencies are not fulfilled.
1917 * -ESTALE: This unit has been started before and can't be started a second time
1918 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1920 int unit_start(Unit
*u
, ActivationDetails
*details
) {
1921 UnitActiveState state
;
1927 /* Let's hold off running start jobs for mount units when /proc/self/mountinfo monitor is ratelimited. */
1928 if (UNIT_VTABLE(u
)->subsystem_ratelimited
) {
1929 r
= UNIT_VTABLE(u
)->subsystem_ratelimited(u
->manager
);
1936 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1937 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1938 * waiting is finished. */
1939 state
= unit_active_state(u
);
1940 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1942 if (state
== UNIT_MAINTENANCE
)
1945 /* Units that aren't loaded cannot be started */
1946 if (u
->load_state
!= UNIT_LOADED
)
1949 /* Refuse starting scope units more than once */
1950 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1953 /* If the conditions were unmet, don't do anything at all. If we already are activating this call might
1954 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1955 * recheck the condition in that case. */
1956 if (state
!= UNIT_ACTIVATING
&&
1957 !unit_test_condition(u
))
1958 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition not met. Not starting unit.");
1960 /* If the asserts failed, fail the entire job */
1961 if (state
!= UNIT_ACTIVATING
&&
1962 !unit_test_assert(u
))
1963 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1965 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1966 * condition checks, so that we rather return condition check errors (which are usually not
1967 * considered a true failure) than "not supported" errors (which are considered a failure).
1969 if (!unit_type_supported(u
->type
))
1972 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1973 * should have taken care of this already, but let's check this here again. After all, our
1974 * dependencies might not be in effect anymore, due to a reload or due to an unmet condition. */
1975 if (!unit_verify_deps(u
))
1978 /* Forward to the main object, if we aren't it. */
1979 following
= unit_following(u
);
1981 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1982 return unit_start(following
, details
);
1985 /* Check our ability to start early so that failure conditions don't cause us to enter a busy loop. */
1986 if (UNIT_VTABLE(u
)->can_start
) {
1987 r
= UNIT_VTABLE(u
)->can_start(u
);
1992 /* If it is stopped, but we cannot start it, then fail */
1993 if (!UNIT_VTABLE(u
)->start
)
1996 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1997 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1998 * waits for a holdoff timer to elapse before it will start again. */
2000 unit_add_to_dbus_queue(u
);
2001 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2003 if (!u
->activation_details
) /* Older details object wins */
2004 u
->activation_details
= activation_details_ref(details
);
2006 return UNIT_VTABLE(u
)->start(u
);
2009 bool unit_can_start(Unit
*u
) {
2012 if (u
->load_state
!= UNIT_LOADED
)
2015 if (!unit_type_supported(u
->type
))
2018 /* Scope units may be started only once */
2019 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
2022 return !!UNIT_VTABLE(u
)->start
;
2025 bool unit_can_isolate(Unit
*u
) {
2028 return unit_can_start(u
) &&
2033 * -EBADR: This unit type does not support stopping.
2034 * -EALREADY: Unit is already stopped.
2035 * -EAGAIN: An operation is already in progress. Retry later.
2037 int unit_stop(Unit
*u
) {
2038 UnitActiveState state
;
2043 state
= unit_active_state(u
);
2044 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
2047 following
= unit_following(u
);
2049 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
2050 return unit_stop(following
);
2053 if (!UNIT_VTABLE(u
)->stop
)
2056 unit_add_to_dbus_queue(u
);
2057 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2059 return UNIT_VTABLE(u
)->stop(u
);
2062 bool unit_can_stop(Unit
*u
) {
2065 /* Note: if we return true here, it does not mean that the unit may be successfully stopped.
2066 * Extrinsic units follow external state and they may stop following external state changes
2067 * (hence we return true here), but an attempt to do this through the manager will fail. */
2069 if (!unit_type_supported(u
->type
))
2075 return !!UNIT_VTABLE(u
)->stop
;
2079 * -EBADR: This unit type does not support reloading.
2080 * -ENOEXEC: Unit is not started.
2081 * -EAGAIN: An operation is already in progress. Retry later.
2083 int unit_reload(Unit
*u
) {
2084 UnitActiveState state
;
2089 if (u
->load_state
!= UNIT_LOADED
)
2092 if (!unit_can_reload(u
))
2095 state
= unit_active_state(u
);
2096 if (state
== UNIT_RELOADING
)
2099 if (state
!= UNIT_ACTIVE
)
2100 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
), "Unit cannot be reloaded because it is inactive.");
2102 following
= unit_following(u
);
2104 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
2105 return unit_reload(following
);
2108 unit_add_to_dbus_queue(u
);
2110 if (!UNIT_VTABLE(u
)->reload
) {
2111 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
2112 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), /* reload_success = */ true);
2116 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2118 return UNIT_VTABLE(u
)->reload(u
);
2121 bool unit_can_reload(Unit
*u
) {
2124 if (UNIT_VTABLE(u
)->can_reload
)
2125 return UNIT_VTABLE(u
)->can_reload(u
);
2127 if (unit_has_dependency(u
, UNIT_ATOM_PROPAGATES_RELOAD_TO
, NULL
))
2130 return UNIT_VTABLE(u
)->reload
;
2133 bool unit_is_unneeded(Unit
*u
) {
2137 if (!u
->stop_when_unneeded
)
2140 /* Don't clean up while the unit is transitioning or is even inactive. */
2141 if (unit_active_state(u
) != UNIT_ACTIVE
)
2146 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_PINS_STOP_WHEN_UNNEEDED
) {
2147 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
2148 * restart, then don't clean this one up. */
2153 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2156 if (unit_will_restart(other
))
2163 bool unit_is_upheld_by_active(Unit
*u
, Unit
**ret_culprit
) {
2168 /* Checks if the unit needs to be started because it currently is not running, but some other unit
2169 * that is active declared an Uphold= dependencies on it */
2171 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)) || u
->job
) {
2173 *ret_culprit
= NULL
;
2177 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_START_STEADILY
) {
2181 if (UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
2183 *ret_culprit
= other
;
2189 *ret_culprit
= NULL
;
2193 bool unit_is_bound_by_inactive(Unit
*u
, Unit
**ret_culprit
) {
2198 /* Checks whether this unit is bound to another unit that is inactive, i.e. whether we should stop
2199 * because the other unit is down. */
2201 if (unit_active_state(u
) != UNIT_ACTIVE
|| u
->job
) {
2202 /* Don't clean up while the unit is transitioning or is even inactive. */
2204 *ret_culprit
= NULL
;
2208 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
2212 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
))) {
2214 *ret_culprit
= other
;
2221 *ret_culprit
= NULL
;
2225 static void check_unneeded_dependencies(Unit
*u
) {
2229 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2231 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_STOP_WHEN_UNNEEDED_QUEUE
)
2232 unit_submit_to_stop_when_unneeded_queue(other
);
2235 static void check_uphold_dependencies(Unit
*u
) {
2239 /* Add all units this unit depends on to the queue that processes Uphold= behaviour. */
2241 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_START_WHEN_UPHELD_QUEUE
)
2242 unit_submit_to_start_when_upheld_queue(other
);
2245 static void check_bound_by_dependencies(Unit
*u
) {
2249 /* Add all units this unit depends on to the queue that processes BindsTo= stop behaviour. */
2251 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_CANNOT_BE_ACTIVE_WITHOUT_QUEUE
)
2252 unit_submit_to_stop_when_bound_queue(other
);
2255 static void retroactively_start_dependencies(Unit
*u
) {
2259 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2261 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_REPLACE
) /* Requires= + BindsTo= */
2262 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2263 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2264 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2266 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_FAIL
) /* Wants= */
2267 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2268 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2269 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2271 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_START
) /* Conflicts= (and inverse) */
2272 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2273 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2276 static void retroactively_stop_dependencies(Unit
*u
) {
2280 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2282 /* Pull down units which are bound to us recursively if enabled */
2283 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_STOP
) /* BoundBy= */
2284 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2285 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2288 void unit_start_on_failure(
2290 const char *dependency_name
,
2291 UnitDependencyAtom atom
,
2299 assert(dependency_name
);
2300 assert(IN_SET(atom
, UNIT_ATOM_ON_SUCCESS
, UNIT_ATOM_ON_FAILURE
));
2302 /* Act on OnFailure= and OnSuccess= dependencies */
2304 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
2305 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2308 log_unit_info(u
, "Triggering %s dependencies.", dependency_name
);
2312 r
= manager_add_job(u
->manager
, JOB_START
, other
, job_mode
, NULL
, &error
, NULL
);
2314 log_unit_warning_errno(
2315 u
, r
, "Failed to enqueue %s job, ignoring: %s",
2316 dependency_name
, bus_error_message(&error
, r
));
2321 log_unit_debug(u
, "Triggering %s dependencies done (%i %s).",
2322 dependency_name
, n_jobs
, n_jobs
== 1 ? "job" : "jobs");
2325 void unit_trigger_notify(Unit
*u
) {
2330 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_TRIGGERED_BY
)
2331 if (UNIT_VTABLE(other
)->trigger_notify
)
2332 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2335 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2336 if (condition_notice
&& log_level
> LOG_NOTICE
)
2338 if (condition_info
&& log_level
> LOG_INFO
)
2343 static int unit_log_resources(Unit
*u
) {
2345 static const struct {
2346 const char *journal_field
;
2347 const char *message_suffix
;
2348 } memory_fields
[_CGROUP_MEMORY_ACCOUNTING_METRIC_CACHED_LAST
+ 1] = {
2349 [CGROUP_MEMORY_PEAK
] = { "MEMORY_PEAK", "memory peak" },
2350 [CGROUP_MEMORY_SWAP_PEAK
] = { "MEMORY_SWAP_PEAK", "memory swap peak" },
2351 }, ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2352 [CGROUP_IP_INGRESS_BYTES
] = { "IP_METRIC_INGRESS_BYTES", "incoming IP traffic" },
2353 [CGROUP_IP_EGRESS_BYTES
] = { "IP_METRIC_EGRESS_BYTES", "outgoing IP traffic" },
2354 [CGROUP_IP_INGRESS_PACKETS
] = { "IP_METRIC_INGRESS_PACKETS", NULL
},
2355 [CGROUP_IP_EGRESS_PACKETS
] = { "IP_METRIC_EGRESS_PACKETS", NULL
},
2356 }, io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2357 [CGROUP_IO_READ_BYTES
] = { "IO_METRIC_READ_BYTES", "read from disk" },
2358 [CGROUP_IO_WRITE_BYTES
] = { "IO_METRIC_WRITE_BYTES", "written to disk" },
2359 [CGROUP_IO_READ_OPERATIONS
] = { "IO_METRIC_READ_OPERATIONS", NULL
},
2360 [CGROUP_IO_WRITE_OPERATIONS
] = { "IO_METRIC_WRITE_OPERATIONS", NULL
},
2363 struct iovec
*iovec
= NULL
;
2365 _cleanup_free_
char *message
= NULL
, *t
= NULL
;
2366 nsec_t cpu_nsec
= NSEC_INFINITY
;
2367 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a threshold */
2371 CLEANUP_ARRAY(iovec
, n_iovec
, iovec_array_free
);
2373 iovec
= new(struct iovec
, 1 + (_CGROUP_MEMORY_ACCOUNTING_METRIC_CACHED_LAST
+ 1) +
2374 _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4);
2378 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2379 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2380 * information and the complete data in structured fields. */
2382 (void) unit_get_cpu_usage(u
, &cpu_nsec
);
2383 if (cpu_nsec
!= NSEC_INFINITY
) {
2384 /* Format the CPU time for inclusion in the structured log message */
2385 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, cpu_nsec
) < 0)
2387 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(TAKE_PTR(t
));
2389 /* Format the CPU time for inclusion in the human language message string */
2390 if (strextendf_with_separator(&message
, ", ",
2391 "Consumed %s CPU time",
2392 FORMAT_TIMESPAN(cpu_nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
)) < 0)
2395 log_level
= raise_level(log_level
,
2396 cpu_nsec
> MENTIONWORTHY_CPU_NSEC
,
2397 cpu_nsec
> NOTICEWORTHY_CPU_NSEC
);
2400 for (CGroupMemoryAccountingMetric metric
= 0; metric
<= _CGROUP_MEMORY_ACCOUNTING_METRIC_CACHED_LAST
; metric
++) {
2401 uint64_t v
= UINT64_MAX
;
2403 assert(memory_fields
[metric
].journal_field
);
2404 assert(memory_fields
[metric
].message_suffix
);
2406 (void) unit_get_memory_accounting(u
, metric
, &v
);
2407 if (v
== UINT64_MAX
)
2410 if (asprintf(&t
, "%s=%" PRIu64
, memory_fields
[metric
].journal_field
, v
) < 0)
2412 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(TAKE_PTR(t
));
2414 if (strextendf_with_separator(&message
, ", ", "%s %s",
2415 FORMAT_BYTES(v
), memory_fields
[metric
].message_suffix
) < 0)
2418 log_level
= raise_level(log_level
,
2419 v
> MENTIONWORTHY_MEMORY_BYTES
,
2420 v
> NOTICEWORTHY_MEMORY_BYTES
);
2423 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2424 uint64_t value
= UINT64_MAX
;
2426 assert(io_fields
[k
].journal_field
);
2428 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2429 if (value
== UINT64_MAX
)
2432 /* Format IO accounting data for inclusion in the structured log message */
2433 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
].journal_field
, value
) < 0)
2435 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(TAKE_PTR(t
));
2437 /* Format the IO accounting data for inclusion in the human language message string, but only
2438 * for the bytes counters (and not for the operations counters) */
2439 if (io_fields
[k
].message_suffix
) {
2440 if (strextendf_with_separator(&message
, ", ", "%s %s",
2441 FORMAT_BYTES(value
), io_fields
[k
].message_suffix
) < 0)
2444 log_level
= raise_level(log_level
,
2445 value
> MENTIONWORTHY_IO_BYTES
,
2446 value
> NOTICEWORTHY_IO_BYTES
);
2450 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2451 uint64_t value
= UINT64_MAX
;
2453 assert(ip_fields
[m
].journal_field
);
2455 (void) unit_get_ip_accounting(u
, m
, &value
);
2456 if (value
== UINT64_MAX
)
2459 /* Format IP accounting data for inclusion in the structured log message */
2460 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
].journal_field
, value
) < 0)
2462 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(TAKE_PTR(t
));
2464 /* Format the IP accounting data for inclusion in the human language message string, but only
2465 * for the bytes counters (and not for the packets counters) */
2466 if (ip_fields
[m
].message_suffix
) {
2467 if (strextendf_with_separator(&message
, ", ", "%s %s",
2468 FORMAT_BYTES(value
), ip_fields
[m
].message_suffix
) < 0)
2471 log_level
= raise_level(log_level
,
2472 value
> MENTIONWORTHY_IP_BYTES
,
2473 value
> NOTICEWORTHY_IP_BYTES
);
2477 /* This check is here because it is the earliest point following all possible log_level assignments.
2478 * (If log_level is assigned anywhere after this point, move this check.) */
2479 if (!unit_log_level_test(u
, log_level
))
2482 /* Is there any accounting data available at all? */
2488 t
= strjoin("MESSAGE=", u
->id
, ": ", message
?: "Completed", ".");
2491 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(TAKE_PTR(t
));
2493 if (!set_iovec_string_field(iovec
, &n_iovec
, "MESSAGE_ID=", SD_MESSAGE_UNIT_RESOURCES_STR
))
2496 if (!set_iovec_string_field(iovec
, &n_iovec
, u
->manager
->unit_log_field
, u
->id
))
2499 if (!set_iovec_string_field(iovec
, &n_iovec
, u
->manager
->invocation_log_field
, u
->invocation_id_string
))
2502 log_unit_struct_iovec(u
, log_level
, iovec
, n_iovec
);
2507 static void unit_update_on_console(Unit
*u
) {
2512 b
= unit_needs_console(u
);
2513 if (u
->on_console
== b
)
2518 manager_ref_console(u
->manager
);
2520 manager_unref_console(u
->manager
);
2523 static void unit_emit_audit_start(Unit
*u
) {
2526 if (UNIT_VTABLE(u
)->audit_start_message_type
<= 0)
2529 /* Write audit record if we have just finished starting up */
2530 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_start_message_type
, /* success= */ true);
2534 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2537 if (UNIT_VTABLE(u
)->audit_start_message_type
<= 0)
2541 /* Write audit record if we have just finished shutting down */
2542 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_stop_message_type
, /* success= */ state
== UNIT_INACTIVE
);
2543 u
->in_audit
= false;
2545 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2546 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_start_message_type
, /* success= */ state
== UNIT_INACTIVE
);
2548 if (state
== UNIT_INACTIVE
)
2549 manager_send_unit_audit(u
->manager
, u
, UNIT_VTABLE(u
)->audit_stop_message_type
, /* success= */ true);
2553 static bool unit_process_job(Job
*j
, UnitActiveState ns
, bool reload_success
) {
2554 bool unexpected
= false;
2559 if (j
->state
== JOB_WAITING
)
2560 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2562 job_add_to_run_queue(j
);
2564 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2565 * hence needs to invalidate jobs. */
2570 case JOB_VERIFY_ACTIVE
:
2572 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2573 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2574 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2577 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2578 if (ns
== UNIT_FAILED
)
2579 result
= JOB_FAILED
;
2583 job_finish_and_invalidate(j
, result
, true, false);
2590 case JOB_RELOAD_OR_START
:
2591 case JOB_TRY_RELOAD
:
2593 if (j
->state
== JOB_RUNNING
) {
2594 if (ns
== UNIT_ACTIVE
)
2595 job_finish_and_invalidate(j
, reload_success
? JOB_DONE
: JOB_FAILED
, true, false);
2596 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2599 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2600 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2608 case JOB_TRY_RESTART
:
2610 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2611 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2612 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2614 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2620 assert_not_reached();
2626 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, bool reload_success
) {
2631 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2632 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2634 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2635 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2636 * remounted this function will be called too! */
2640 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2641 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2642 unit_add_to_dbus_queue(u
);
2644 /* Update systemd-oomd on the property/state change */
2646 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2648 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2649 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2650 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2651 * have the information on the property. Thus, indiscriminately send an update. */
2652 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2653 (void) manager_varlink_send_managed_oom_update(u
);
2656 /* Update timestamps for state changes */
2657 if (!MANAGER_IS_RELOADING(m
)) {
2658 dual_timestamp_now(&u
->state_change_timestamp
);
2660 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2661 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2662 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2663 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2665 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2666 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2667 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2668 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2671 /* Keep track of failed units */
2672 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2674 /* Make sure the cgroup and state files are always removed when we become inactive */
2675 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2676 SET_FLAG(u
->markers
,
2677 (1u << UNIT_MARKER_NEEDS_RELOAD
)|(1u << UNIT_MARKER_NEEDS_RESTART
),
2679 unit_prune_cgroup(u
);
2680 unit_unlink_state_files(u
);
2681 } else if (ns
!= os
&& ns
== UNIT_RELOADING
)
2682 SET_FLAG(u
->markers
, 1u << UNIT_MARKER_NEEDS_RELOAD
, false);
2684 unit_update_on_console(u
);
2686 if (!MANAGER_IS_RELOADING(m
)) {
2689 /* Let's propagate state changes to the job */
2691 unexpected
= unit_process_job(u
->job
, ns
, reload_success
);
2695 /* If this state change happened without being requested by a job, then let's retroactively start or
2696 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2697 * additional jobs just because something is already activated. */
2700 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2701 retroactively_start_dependencies(u
);
2702 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2703 retroactively_stop_dependencies(u
);
2706 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2707 log_unit_debug(u
, "Unit entered failed state.");
2708 unit_start_on_failure(u
, "OnFailure=", UNIT_ATOM_ON_FAILURE
, u
->on_failure_job_mode
);
2711 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2712 /* This unit just finished starting up */
2714 unit_emit_audit_start(u
);
2715 manager_send_unit_plymouth(m
, u
);
2718 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2719 /* This unit just stopped/failed. */
2721 unit_emit_audit_stop(u
, ns
);
2722 unit_log_resources(u
);
2725 if (ns
== UNIT_INACTIVE
&& !IN_SET(os
, UNIT_FAILED
, UNIT_INACTIVE
, UNIT_MAINTENANCE
))
2726 unit_start_on_failure(u
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
, u
->on_success_job_mode
);
2729 manager_recheck_journal(m
);
2730 manager_recheck_dbus(m
);
2732 unit_trigger_notify(u
);
2734 if (!MANAGER_IS_RELOADING(m
)) {
2735 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2736 reason
= strjoina("unit ", u
->id
, " failed");
2737 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2738 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2739 reason
= strjoina("unit ", u
->id
, " succeeded");
2740 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2744 /* And now, add the unit or depending units to various queues that will act on the new situation if
2745 * needed. These queues generally check for continuous state changes rather than events (like most of
2746 * the state propagation above), and do work deferred instead of instantly, since they typically
2747 * don't want to run during reloading, and usually involve checking combined state of multiple units
2750 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2751 /* Stop unneeded units and bound-by units regardless if going down was expected or not */
2752 check_unneeded_dependencies(u
);
2753 check_bound_by_dependencies(u
);
2755 /* Maybe someone wants us to remain up? */
2756 unit_submit_to_start_when_upheld_queue(u
);
2758 /* Maybe the unit should be GC'ed now? */
2759 unit_add_to_gc_queue(u
);
2761 /* Maybe we can release some resources now? */
2762 unit_submit_to_release_resources_queue(u
);
2765 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2766 /* Start uphold units regardless if going up was expected or not */
2767 check_uphold_dependencies(u
);
2769 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2770 unit_submit_to_stop_when_unneeded_queue(u
);
2772 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens
2773 * when something BindsTo= to a Type=oneshot unit, as these units go directly from starting to
2774 * inactive, without ever entering started.) */
2775 unit_submit_to_stop_when_bound_queue(u
);
2779 int unit_watch_pidref(Unit
*u
, PidRef
*pid
, bool exclusive
) {
2780 _cleanup_(pidref_freep
) PidRef
*pid_dup
= NULL
;
2783 /* Adds a specific PID to the set of PIDs this unit watches. */
2786 assert(pidref_is_set(pid
));
2788 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2789 * opportunity to remove any stalled references to this PID as they can be created
2790 * easily (when watching a process which is not our direct child). */
2792 manager_unwatch_pidref(u
->manager
, pid
);
2794 if (set_contains(u
->pids
, pid
)) /* early exit if already being watched */
2797 r
= pidref_dup(pid
, &pid_dup
);
2801 /* First, insert into the set of PIDs maintained by the unit */
2802 r
= set_ensure_put(&u
->pids
, &pidref_hash_ops_free
, pid_dup
);
2806 pid
= TAKE_PTR(pid_dup
); /* continue with our copy now that we have installed it properly in our set */
2808 /* Second, insert it into the simple global table, see if that works */
2809 r
= hashmap_ensure_put(&u
->manager
->watch_pids
, &pidref_hash_ops_free
, pid
, u
);
2813 /* OK, the key is already assigned to a different unit. That's fine, then add us via the second
2814 * hashmap that points to an array. */
2816 PidRef
*old_pid
= NULL
;
2817 Unit
**array
= hashmap_get2(u
->manager
->watch_pids_more
, pid
, (void**) &old_pid
);
2819 /* Count entries in array */
2821 for (; array
&& array
[n
]; n
++)
2824 /* Allocate a new array */
2825 _cleanup_free_ Unit
**new_array
= new(Unit
*, n
+ 2);
2829 /* Append us to the end */
2830 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2832 new_array
[n
+1] = NULL
;
2834 /* Make sure the hashmap is allocated */
2835 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids_more
, &pidref_hash_ops_free
);
2839 /* Add or replace the old array */
2840 r
= hashmap_replace(u
->manager
->watch_pids_more
, old_pid
?: pid
, new_array
);
2844 TAKE_PTR(new_array
); /* Now part of the hash table */
2845 free(array
); /* Which means we can now delete the old version */
2849 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2850 _cleanup_(pidref_done
) PidRef pidref
= PIDREF_NULL
;
2854 assert(pid_is_valid(pid
));
2856 r
= pidref_set_pid(&pidref
, pid
);
2860 return unit_watch_pidref(u
, &pidref
, exclusive
);
2863 void unit_unwatch_pidref(Unit
*u
, PidRef
*pid
) {
2865 assert(pidref_is_set(pid
));
2867 /* Remove from the set we maintain for this unit. (And destroy the returned pid eventually) */
2868 _cleanup_(pidref_freep
) PidRef
*pid1
= set_remove(u
->pids
, pid
);
2870 return; /* Early exit if this PID was never watched by us */
2872 /* First let's drop the unit from the simple hash table, if it is included there */
2873 PidRef
*pid2
= NULL
;
2874 Unit
*uu
= hashmap_get2(u
->manager
->watch_pids
, pid
, (void**) &pid2
);
2876 /* Quick validation: iff we are in the watch_pids table then the PidRef object must be the same as in our local pids set */
2877 assert((uu
== u
) == (pid1
== pid2
));
2880 /* OK, we are in the first table. Let's remove it there then, and we are done already. */
2881 assert_se(hashmap_remove_value(u
->manager
->watch_pids
, pid2
, uu
));
2883 /* We weren't in the first table, then let's consult the 2nd table that points to an array */
2884 PidRef
*pid3
= NULL
;
2885 Unit
**array
= hashmap_get2(u
->manager
->watch_pids_more
, pid
, (void**) &pid3
);
2887 /* Let's iterate through the array, dropping our own entry */
2888 size_t m
= 0, n
= 0;
2889 for (; array
&& array
[n
]; n
++)
2891 array
[m
++] = array
[n
];
2893 return; /* Not there */
2895 array
[m
] = NULL
; /* set trailing NULL marker on the new end */
2898 /* The array is now empty, remove the entire entry */
2899 assert_se(hashmap_remove_value(u
->manager
->watch_pids_more
, pid3
, array
));
2902 /* The array is not empty, but let's make sure the entry is not keyed by the PidRef
2903 * we will delete, but by the PidRef object of the Unit that is now first in the
2906 PidRef
*new_pid3
= ASSERT_PTR(set_get(array
[0]->pids
, pid
));
2907 assert_se(hashmap_replace(u
->manager
->watch_pids_more
, new_pid3
, array
) >= 0);
2912 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2913 return unit_unwatch_pidref(u
, &PIDREF_MAKE_FROM_PID(pid
));
2916 void unit_unwatch_all_pids(Unit
*u
) {
2919 while (!set_isempty(u
->pids
))
2920 unit_unwatch_pidref(u
, set_first(u
->pids
));
2922 u
->pids
= set_free(u
->pids
);
2925 static void unit_tidy_watch_pids(Unit
*u
) {
2926 PidRef
*except1
, *except2
, *e
;
2930 /* Cleans dead PIDs from our list */
2932 except1
= unit_main_pid(u
);
2933 except2
= unit_control_pid(u
);
2935 SET_FOREACH(e
, u
->pids
) {
2936 if (pidref_equal(except1
, e
) || pidref_equal(except2
, e
))
2939 if (pidref_is_unwaited(e
) <= 0)
2940 unit_unwatch_pidref(u
, e
);
2944 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2945 Unit
*u
= ASSERT_PTR(userdata
);
2949 unit_tidy_watch_pids(u
);
2950 unit_watch_all_pids(u
);
2952 /* If the PID set is empty now, then let's finish this off. */
2953 unit_synthesize_cgroup_empty_event(u
);
2958 int unit_enqueue_rewatch_pids(Unit
*u
) {
2963 if (!u
->cgroup_path
)
2966 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2969 if (r
> 0) /* On unified we can use proper notifications */
2972 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2973 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2974 * involves issuing kill(pid, 0) on all processes we watch. */
2976 if (!u
->rewatch_pids_event_source
) {
2977 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2979 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2981 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2983 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2985 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
2987 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2989 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2992 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2994 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2999 void unit_dequeue_rewatch_pids(Unit
*u
) {
3003 if (!u
->rewatch_pids_event_source
)
3006 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
3008 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
3010 u
->rewatch_pids_event_source
= sd_event_source_disable_unref(u
->rewatch_pids_event_source
);
3013 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
3015 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
3019 case JOB_VERIFY_ACTIVE
:
3022 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
3023 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
3028 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
3029 * external events), hence it makes no sense to permit enqueuing such a request either. */
3030 return !u
->perpetual
;
3033 case JOB_TRY_RESTART
:
3034 return unit_can_stop(u
) && unit_can_start(u
);
3037 case JOB_TRY_RELOAD
:
3038 return unit_can_reload(u
);
3040 case JOB_RELOAD_OR_START
:
3041 return unit_can_reload(u
) && unit_can_start(u
);
3044 assert_not_reached();
3048 static Hashmap
*unit_get_dependency_hashmap_per_type(Unit
*u
, UnitDependency d
) {
3052 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3054 deps
= hashmap_get(u
->dependencies
, UNIT_DEPENDENCY_TO_PTR(d
));
3056 _cleanup_hashmap_free_ Hashmap
*h
= NULL
;
3058 h
= hashmap_new(NULL
);
3062 if (hashmap_ensure_put(&u
->dependencies
, NULL
, UNIT_DEPENDENCY_TO_PTR(d
), h
) < 0)
3071 typedef enum NotifyDependencyFlags
{
3072 NOTIFY_DEPENDENCY_UPDATE_FROM
= 1 << 0,
3073 NOTIFY_DEPENDENCY_UPDATE_TO
= 1 << 1,
3074 } NotifyDependencyFlags
;
3076 static int unit_add_dependency_impl(
3080 UnitDependencyMask mask
) {
3082 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
3083 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
3084 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
3085 [UNIT_WANTS
] = UNIT_WANTED_BY
,
3086 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
3087 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
3088 [UNIT_UPHOLDS
] = UNIT_UPHELD_BY
,
3089 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
3090 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
3091 [UNIT_WANTED_BY
] = UNIT_WANTS
,
3092 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
3093 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
3094 [UNIT_UPHELD_BY
] = UNIT_UPHOLDS
,
3095 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
3096 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
3097 [UNIT_BEFORE
] = UNIT_AFTER
,
3098 [UNIT_AFTER
] = UNIT_BEFORE
,
3099 [UNIT_ON_SUCCESS
] = UNIT_ON_SUCCESS_OF
,
3100 [UNIT_ON_SUCCESS_OF
] = UNIT_ON_SUCCESS
,
3101 [UNIT_ON_FAILURE
] = UNIT_ON_FAILURE_OF
,
3102 [UNIT_ON_FAILURE_OF
] = UNIT_ON_FAILURE
,
3103 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
3104 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
3105 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3106 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3107 [UNIT_PROPAGATES_STOP_TO
] = UNIT_STOP_PROPAGATED_FROM
,
3108 [UNIT_STOP_PROPAGATED_FROM
] = UNIT_PROPAGATES_STOP_TO
,
3109 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
, /* symmetric! 👓 */
3110 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3111 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3112 [UNIT_IN_SLICE
] = UNIT_SLICE_OF
,
3113 [UNIT_SLICE_OF
] = UNIT_IN_SLICE
,
3116 Hashmap
*u_deps
, *other_deps
;
3117 UnitDependencyInfo u_info
, u_info_old
, other_info
, other_info_old
;
3118 NotifyDependencyFlags flags
= 0;
3123 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3124 assert(inverse_table
[d
] >= 0 && inverse_table
[d
] < _UNIT_DEPENDENCY_MAX
);
3125 assert(mask
> 0 && mask
< _UNIT_DEPENDENCY_MASK_FULL
);
3127 /* Ensure the following two hashmaps for each unit exist:
3128 * - the top-level dependency hashmap that maps UnitDependency → Hashmap(Unit* → UnitDependencyInfo),
3129 * - the inner hashmap, that maps Unit* → UnitDependencyInfo, for the specified dependency type. */
3130 u_deps
= unit_get_dependency_hashmap_per_type(u
, d
);
3134 other_deps
= unit_get_dependency_hashmap_per_type(other
, inverse_table
[d
]);
3138 /* Save the original dependency info. */
3139 u_info
.data
= u_info_old
.data
= hashmap_get(u_deps
, other
);
3140 other_info
.data
= other_info_old
.data
= hashmap_get(other_deps
, u
);
3142 /* Update dependency info. */
3143 u_info
.origin_mask
|= mask
;
3144 other_info
.destination_mask
|= mask
;
3146 /* Save updated dependency info. */
3147 if (u_info
.data
!= u_info_old
.data
) {
3148 r
= hashmap_replace(u_deps
, other
, u_info
.data
);
3152 flags
= NOTIFY_DEPENDENCY_UPDATE_FROM
;
3155 if (other_info
.data
!= other_info_old
.data
) {
3156 r
= hashmap_replace(other_deps
, u
, other_info
.data
);
3158 if (u_info
.data
!= u_info_old
.data
) {
3159 /* Restore the old dependency. */
3160 if (u_info_old
.data
)
3161 (void) hashmap_update(u_deps
, other
, u_info_old
.data
);
3163 hashmap_remove(u_deps
, other
);
3168 flags
|= NOTIFY_DEPENDENCY_UPDATE_TO
;
3174 int unit_add_dependency(
3179 UnitDependencyMask mask
) {
3181 UnitDependencyAtom a
;
3184 /* Helper to know whether sending a notification is necessary or not: if the dependency is already
3185 * there, no need to notify! */
3186 NotifyDependencyFlags notify_flags
;
3189 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3192 u
= unit_follow_merge(u
);
3193 other
= unit_follow_merge(other
);
3194 a
= unit_dependency_to_atom(d
);
3197 /* We won't allow dependencies on ourselves. We will not consider them an error however. */
3199 if (unit_should_warn_about_dependency(d
))
3200 log_unit_warning(u
, "Dependency %s=%s is dropped.",
3201 unit_dependency_to_string(d
), u
->id
);
3205 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3208 /* Note that ordering a device unit after a unit is permitted since it allows to start its job
3209 * running timeout at a specific time. */
3210 if (FLAGS_SET(a
, UNIT_ATOM_BEFORE
) && other
->type
== UNIT_DEVICE
) {
3211 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3215 if (FLAGS_SET(a
, UNIT_ATOM_ON_FAILURE
) && !UNIT_VTABLE(u
)->can_fail
) {
3216 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3220 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERS
) && !UNIT_VTABLE(u
)->can_trigger
)
3221 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3222 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3223 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERED_BY
) && !UNIT_VTABLE(other
)->can_trigger
)
3224 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3225 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3227 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && other
->type
!= UNIT_SLICE
)
3228 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3229 "Requested dependency Slice=%s refused (%s is not a slice unit).", other
->id
, other
->id
);
3230 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && u
->type
!= UNIT_SLICE
)
3231 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3232 "Requested dependency SliceOf=%s refused (%s is not a slice unit).", other
->id
, u
->id
);
3234 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && !UNIT_HAS_CGROUP_CONTEXT(u
))
3235 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3236 "Requested dependency Slice=%s refused (%s is not a cgroup unit).", other
->id
, u
->id
);
3238 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && !UNIT_HAS_CGROUP_CONTEXT(other
))
3239 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3240 "Requested dependency SliceOf=%s refused (%s is not a cgroup unit).", other
->id
, other
->id
);
3242 r
= unit_add_dependency_impl(u
, d
, other
, mask
);
3247 if (add_reference
) {
3248 r
= unit_add_dependency_impl(u
, UNIT_REFERENCES
, other
, mask
);
3254 if (FLAGS_SET(notify_flags
, NOTIFY_DEPENDENCY_UPDATE_FROM
))
3255 unit_add_to_dbus_queue(u
);
3256 if (FLAGS_SET(notify_flags
, NOTIFY_DEPENDENCY_UPDATE_TO
))
3257 unit_add_to_dbus_queue(other
);
3259 return notify_flags
!= 0;
3262 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3266 assert(d
>= 0 || e
>= 0);
3269 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3275 s
= unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3280 return r
> 0 || s
> 0;
3283 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3291 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3298 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3300 _cleanup_free_
char *i
= NULL
;
3302 r
= unit_name_to_prefix(u
->id
, &i
);
3306 r
= unit_name_replace_instance(name
, i
, buf
);
3315 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3316 _cleanup_free_
char *buf
= NULL
;
3323 r
= resolve_template(u
, name
, &buf
, &name
);
3327 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3330 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3334 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3337 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3338 _cleanup_free_
char *buf
= NULL
;
3345 r
= resolve_template(u
, name
, &buf
, &name
);
3349 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3352 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3356 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3359 int set_unit_path(const char *p
) {
3360 /* This is mostly for debug purposes */
3361 return RET_NERRNO(setenv("SYSTEMD_UNIT_PATH", p
, 1));
3364 char *unit_dbus_path(Unit
*u
) {
3370 return unit_dbus_path_from_name(u
->id
);
3373 char *unit_dbus_path_invocation_id(Unit
*u
) {
3376 if (sd_id128_is_null(u
->invocation_id
))
3379 return unit_dbus_path_from_name(u
->invocation_id_string
);
3382 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3387 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3389 if (sd_id128_equal(u
->invocation_id
, id
))
3392 if (!sd_id128_is_null(u
->invocation_id
))
3393 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3395 if (sd_id128_is_null(id
)) {
3400 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3404 u
->invocation_id
= id
;
3405 sd_id128_to_string(id
, u
->invocation_id_string
);
3407 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3414 u
->invocation_id
= SD_ID128_NULL
;
3415 u
->invocation_id_string
[0] = 0;
3419 int unit_set_slice(Unit
*u
, Unit
*slice
) {
3425 /* Sets the unit slice if it has not been set before. Is extra careful, to only allow this for units
3426 * that actually have a cgroup context. Also, we don't allow to set this for slices (since the parent
3427 * slice is derived from the name). Make sure the unit we set is actually a slice. */
3429 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3432 if (u
->type
== UNIT_SLICE
)
3435 if (unit_active_state(u
) != UNIT_INACTIVE
)
3438 if (slice
->type
!= UNIT_SLICE
)
3441 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3442 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3445 if (UNIT_GET_SLICE(u
) == slice
)
3448 /* Disallow slice changes if @u is already bound to cgroups */
3449 if (UNIT_GET_SLICE(u
) && u
->cgroup_realized
)
3452 /* Remove any slices assigned prior; we should only have one UNIT_IN_SLICE dependency */
3453 if (UNIT_GET_SLICE(u
))
3454 unit_remove_dependencies(u
, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3456 r
= unit_add_dependency(u
, UNIT_IN_SLICE
, slice
, true, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3463 int unit_set_default_slice(Unit
*u
) {
3464 const char *slice_name
;
3470 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3473 if (UNIT_GET_SLICE(u
))
3477 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3479 /* Implicitly place all instantiated units in their
3480 * own per-template slice */
3482 r
= unit_name_to_prefix(u
->id
, &prefix
);
3486 /* The prefix is already escaped, but it might include
3487 * "-" which has a special meaning for slice units,
3488 * hence escape it here extra. */
3489 escaped
= unit_name_escape(prefix
);
3493 if (MANAGER_IS_SYSTEM(u
->manager
))
3494 slice_name
= strjoina("system-", escaped
, ".slice");
3496 slice_name
= strjoina("app-", escaped
, ".slice");
3498 } else if (unit_is_extrinsic(u
))
3499 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3500 * the root slice. They don't really belong in one of the subslices. */
3501 slice_name
= SPECIAL_ROOT_SLICE
;
3503 else if (MANAGER_IS_SYSTEM(u
->manager
))
3504 slice_name
= SPECIAL_SYSTEM_SLICE
;
3506 slice_name
= SPECIAL_APP_SLICE
;
3508 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3512 return unit_set_slice(u
, slice
);
3515 const char *unit_slice_name(Unit
*u
) {
3519 slice
= UNIT_GET_SLICE(u
);
3526 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3527 _cleanup_free_
char *t
= NULL
;
3534 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3537 if (unit_has_name(u
, t
))
3540 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3541 assert(r
< 0 || *_found
!= u
);
3545 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3546 const char *new_owner
;
3547 Unit
*u
= ASSERT_PTR(userdata
);
3552 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3554 bus_log_parse_error(r
);
3558 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3559 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3564 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3565 const sd_bus_error
*e
;
3566 const char *new_owner
;
3567 Unit
*u
= ASSERT_PTR(userdata
);
3572 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3574 e
= sd_bus_message_get_error(message
);
3576 if (!sd_bus_error_has_name(e
, SD_BUS_ERROR_NAME_HAS_NO_OWNER
)) {
3577 r
= sd_bus_error_get_errno(e
);
3578 log_unit_error_errno(u
, r
,
3579 "Unexpected error response from GetNameOwner(): %s",
3580 bus_error_message(e
, r
));
3585 r
= sd_bus_message_read(message
, "s", &new_owner
);
3587 return bus_log_parse_error(r
);
3589 assert(!isempty(new_owner
));
3592 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3593 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3598 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3599 _cleanup_(sd_bus_message_unrefp
) sd_bus_message
*m
= NULL
;
3601 usec_t timeout_usec
= 0;
3608 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3611 /* NameOwnerChanged and GetNameOwner is used to detect when a service finished starting up. The dbus
3612 * call timeout shouldn't be earlier than that. If we couldn't get the start timeout, use the default
3613 * value defined above. */
3614 if (UNIT_VTABLE(u
)->get_timeout_start_usec
)
3615 timeout_usec
= UNIT_VTABLE(u
)->get_timeout_start_usec(u
);
3617 match
= strjoina("type='signal',"
3618 "sender='org.freedesktop.DBus',"
3619 "path='/org/freedesktop/DBus',"
3620 "interface='org.freedesktop.DBus',"
3621 "member='NameOwnerChanged',"
3622 "arg0='", name
, "'");
3624 r
= bus_add_match_full(
3629 signal_name_owner_changed
,
3636 r
= sd_bus_message_new_method_call(
3639 "org.freedesktop.DBus",
3640 "/org/freedesktop/DBus",
3641 "org.freedesktop.DBus",
3646 r
= sd_bus_message_append(m
, "s", name
);
3650 r
= sd_bus_call_async(
3652 &u
->get_name_owner_slot
,
3654 get_name_owner_handler
,
3659 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3663 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3667 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3673 /* Watch a specific name on the bus. We only support one unit
3674 * watching each name for now. */
3676 if (u
->manager
->api_bus
) {
3677 /* If the bus is already available, install the match directly.
3678 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3679 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3681 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3684 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3686 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3687 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3688 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3694 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3698 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3699 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3700 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3703 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3704 _cleanup_free_
char *e
= NULL
;
3710 /* Adds in links to the device node that this unit is based on */
3714 if (!is_device_path(what
))
3717 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3718 if (!unit_type_supported(UNIT_DEVICE
))
3721 r
= unit_name_from_path(what
, ".device", &e
);
3725 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3729 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3730 dep
= UNIT_BINDS_TO
;
3732 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3733 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3734 device
, true, mask
);
3737 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3738 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3746 if (!path_startswith(what
, "/dev/"))
3749 /* If we don't support devices, then also don't bother with blockdev@.target */
3750 if (!unit_type_supported(UNIT_DEVICE
))
3753 r
= unit_name_path_escape(what
, &escaped
);
3757 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3761 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3764 int unit_coldplug(Unit
*u
) {
3769 /* Make sure we don't enter a loop, when coldplugging recursively. */
3773 u
->coldplugged
= true;
3775 STRV_FOREACH(i
, u
->deserialized_refs
)
3776 RET_GATHER(r
, bus_unit_track_add_name(u
, *i
));
3778 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3780 if (UNIT_VTABLE(u
)->coldplug
)
3781 RET_GATHER(r
, UNIT_VTABLE(u
)->coldplug(u
));
3784 RET_GATHER(r
, job_coldplug(u
->job
));
3786 RET_GATHER(r
, job_coldplug(u
->nop_job
));
3788 unit_modify_nft_set(u
, /* add = */ true);
3792 void unit_catchup(Unit
*u
) {
3795 if (UNIT_VTABLE(u
)->catchup
)
3796 UNIT_VTABLE(u
)->catchup(u
);
3798 unit_cgroup_catchup(u
);
3801 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3807 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3808 * are never out-of-date. */
3809 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3812 if (stat(path
, &st
) < 0)
3813 /* What, cannot access this anymore? */
3817 /* For masked files check if they are still so */
3818 return !null_or_empty(&st
);
3820 /* For non-empty files check the mtime */
3821 return timespec_load(&st
.st_mtim
) > mtime
;
3826 bool unit_need_daemon_reload(Unit
*u
) {
3827 _cleanup_strv_free_
char **dropins
= NULL
;
3832 if (u
->manager
->unit_file_state_outdated
)
3835 /* For unit files, we allow masking… */
3836 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3837 u
->load_state
== UNIT_MASKED
))
3840 /* Source paths should not be masked… */
3841 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3844 if (u
->load_state
== UNIT_LOADED
)
3845 (void) unit_find_dropin_paths(u
, &dropins
);
3846 if (!strv_equal(u
->dropin_paths
, dropins
))
3849 /* … any drop-ins that are masked are simply omitted from the list. */
3850 STRV_FOREACH(path
, u
->dropin_paths
)
3851 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3857 void unit_reset_failed(Unit
*u
) {
3860 if (UNIT_VTABLE(u
)->reset_failed
)
3861 UNIT_VTABLE(u
)->reset_failed(u
);
3863 ratelimit_reset(&u
->start_ratelimit
);
3864 u
->start_limit_hit
= false;
3867 Unit
*unit_following(Unit
*u
) {
3870 if (UNIT_VTABLE(u
)->following
)
3871 return UNIT_VTABLE(u
)->following(u
);
3876 bool unit_stop_pending(Unit
*u
) {
3879 /* This call does check the current state of the unit. It's
3880 * hence useful to be called from state change calls of the
3881 * unit itself, where the state isn't updated yet. This is
3882 * different from unit_inactive_or_pending() which checks both
3883 * the current state and for a queued job. */
3885 return unit_has_job_type(u
, JOB_STOP
);
3888 bool unit_inactive_or_pending(Unit
*u
) {
3891 /* Returns true if the unit is inactive or going down */
3893 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3896 if (unit_stop_pending(u
))
3902 bool unit_active_or_pending(Unit
*u
) {
3905 /* Returns true if the unit is active or going up */
3907 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3911 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3917 bool unit_will_restart_default(Unit
*u
) {
3920 return unit_has_job_type(u
, JOB_START
);
3923 bool unit_will_restart(Unit
*u
) {
3926 if (!UNIT_VTABLE(u
)->will_restart
)
3929 return UNIT_VTABLE(u
)->will_restart(u
);
3932 void unit_notify_cgroup_oom(Unit
*u
, bool managed_oom
) {
3935 if (UNIT_VTABLE(u
)->notify_cgroup_oom
)
3936 UNIT_VTABLE(u
)->notify_cgroup_oom(u
, managed_oom
);
3939 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3940 _cleanup_set_free_ Set
*pid_set
= NULL
;
3943 pid_set
= set_new(NULL
);
3947 /* Exclude the main/control pids from being killed via the cgroup */
3949 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3954 if (control_pid
> 0) {
3955 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3960 return TAKE_PTR(pid_set
);
3963 static int kill_common_log(const PidRef
*pid
, int signo
, void *userdata
) {
3964 _cleanup_free_
char *comm
= NULL
;
3965 Unit
*u
= ASSERT_PTR(userdata
);
3967 (void) pidref_get_comm(pid
, &comm
);
3969 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
3970 signal_to_string(signo
), pid
->pid
, strna(comm
));
3975 static int kill_or_sigqueue(PidRef
* pidref
, int signo
, int code
, int value
) {
3976 assert(pidref_is_set(pidref
));
3977 assert(SIGNAL_VALID(signo
));
3982 log_debug("Killing " PID_FMT
" with signal SIG%s.", pidref
->pid
, signal_to_string(signo
));
3983 return pidref_kill(pidref
, signo
);
3986 log_debug("Enqueuing value %i to " PID_FMT
" on signal SIG%s.", value
, pidref
->pid
, signal_to_string(signo
));
3987 return pidref_sigqueue(pidref
, signo
, value
);
3990 assert_not_reached();
4000 sd_bus_error
*error
) {
4002 PidRef
*main_pid
, *control_pid
;
4003 bool killed
= false;
4006 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
4007 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
4008 * stop a service ourselves. */
4012 assert(who
< _KILL_WHO_MAX
);
4013 assert(SIGNAL_VALID(signo
));
4014 assert(IN_SET(code
, SI_USER
, SI_QUEUE
));
4016 main_pid
= unit_main_pid(u
);
4017 control_pid
= unit_control_pid(u
);
4019 if (!UNIT_HAS_CGROUP_CONTEXT(u
) && !main_pid
&& !control_pid
)
4020 return sd_bus_error_setf(error
, SD_BUS_ERROR_NOT_SUPPORTED
, "Unit type does not support process killing.");
4022 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
4024 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
4025 if (!pidref_is_set(main_pid
))
4026 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
4029 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
4031 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
4032 if (!pidref_is_set(control_pid
))
4033 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
4036 if (pidref_is_set(control_pid
) &&
4037 IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
)) {
4038 _cleanup_free_
char *comm
= NULL
;
4039 (void) pidref_get_comm(control_pid
, &comm
);
4041 r
= kill_or_sigqueue(control_pid
, signo
, code
, value
);
4045 /* Report this failure both to the logs and to the client */
4046 sd_bus_error_set_errnof(
4048 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
4049 signal_to_string(signo
), control_pid
->pid
, strna(comm
));
4050 log_unit_warning_errno(
4052 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
4053 signal_to_string(signo
), control_pid
->pid
, strna(comm
));
4055 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
4056 signal_to_string(signo
), control_pid
->pid
, strna(comm
));
4061 if (pidref_is_set(main_pid
) &&
4062 IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
)) {
4063 _cleanup_free_
char *comm
= NULL
;
4064 (void) pidref_get_comm(main_pid
, &comm
);
4066 r
= kill_or_sigqueue(main_pid
, signo
, code
, value
);
4071 sd_bus_error_set_errnof(
4073 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
4074 signal_to_string(signo
), main_pid
->pid
, strna(comm
));
4077 log_unit_warning_errno(
4079 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
4080 signal_to_string(signo
), main_pid
->pid
, strna(comm
));
4083 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
4084 signal_to_string(signo
), main_pid
->pid
, strna(comm
));
4089 /* Note: if we shall enqueue rather than kill we won't do this via the cgroup mechanism, since it
4090 * doesn't really make much sense (and given that enqueued values are a relatively expensive
4091 * resource, and we shouldn't allow us to be subjects for such allocation sprees) */
4092 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
&& code
== SI_USER
) {
4093 _cleanup_set_free_ Set
*pid_set
= NULL
;
4095 /* Exclude the main/control pids from being killed via the cgroup */
4096 pid_set
= unit_pid_set(main_pid
? main_pid
->pid
: 0, control_pid
? control_pid
->pid
: 0);
4100 r
= cg_kill_recursive(u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
4102 if (!IN_SET(r
, -ESRCH
, -ENOENT
)) {
4106 sd_bus_error_set_errnof(
4108 "Failed to send signal SIG%s to auxiliary processes: %m",
4109 signal_to_string(signo
));
4112 log_unit_warning_errno(
4114 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
4115 signal_to_string(signo
));
4121 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
4122 if (ret
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
4123 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
4128 int unit_following_set(Unit
*u
, Set
**s
) {
4132 if (UNIT_VTABLE(u
)->following_set
)
4133 return UNIT_VTABLE(u
)->following_set(u
, s
);
4139 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
4144 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
4145 r
= unit_file_get_state(
4146 u
->manager
->runtime_scope
,
4149 &u
->unit_file_state
);
4151 u
->unit_file_state
= UNIT_FILE_BAD
;
4154 return u
->unit_file_state
;
4157 PresetAction
unit_get_unit_file_preset(Unit
*u
) {
4162 if (u
->unit_file_preset
< 0 && u
->fragment_path
) {
4163 _cleanup_free_
char *bn
= NULL
;
4165 r
= path_extract_filename(u
->fragment_path
, &bn
);
4167 return (u
->unit_file_preset
= r
);
4169 if (r
== O_DIRECTORY
)
4170 return (u
->unit_file_preset
= -EISDIR
);
4172 u
->unit_file_preset
= unit_file_query_preset(
4173 u
->manager
->runtime_scope
,
4179 return u
->unit_file_preset
;
4182 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
4188 unit_ref_unset(ref
);
4190 ref
->source
= source
;
4191 ref
->target
= target
;
4192 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
4196 void unit_ref_unset(UnitRef
*ref
) {
4202 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
4203 * be unreferenced now. */
4204 unit_add_to_gc_queue(ref
->target
);
4206 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
4207 ref
->source
= ref
->target
= NULL
;
4210 static int user_from_unit_name(Unit
*u
, char **ret
) {
4212 static const uint8_t hash_key
[] = {
4213 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4214 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4217 _cleanup_free_
char *n
= NULL
;
4220 r
= unit_name_to_prefix(u
->id
, &n
);
4224 if (valid_user_group_name(n
, 0)) {
4229 /* If we can't use the unit name as a user name, then let's hash it and use that */
4230 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4236 int unit_patch_contexts(Unit
*u
) {
4243 /* Patch in the manager defaults into the exec and cgroup
4244 * contexts, _after_ the rest of the settings have been
4247 ec
= unit_get_exec_context(u
);
4249 /* This only copies in the ones that need memory */
4250 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
4251 if (u
->manager
->defaults
.rlimit
[i
] && !ec
->rlimit
[i
]) {
4252 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->defaults
.rlimit
[i
], 1);
4257 if (MANAGER_IS_USER(u
->manager
) &&
4258 !ec
->working_directory
) {
4260 r
= get_home_dir(&ec
->working_directory
);
4264 /* Allow user services to run, even if the
4265 * home directory is missing */
4266 ec
->working_directory_missing_ok
= true;
4269 if (ec
->private_devices
)
4270 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4272 if (ec
->protect_kernel_modules
)
4273 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4275 if (ec
->protect_kernel_logs
)
4276 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4278 if (ec
->protect_clock
)
4279 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4281 if (ec
->dynamic_user
) {
4283 r
= user_from_unit_name(u
, &ec
->user
);
4289 ec
->group
= strdup(ec
->user
);
4294 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4295 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4298 ec
->private_tmp
= true;
4299 ec
->remove_ipc
= true;
4300 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4301 if (ec
->protect_home
== PROTECT_HOME_NO
)
4302 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4304 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4306 ec
->no_new_privileges
= true;
4307 ec
->restrict_suid_sgid
= true;
4310 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++)
4311 exec_directory_sort(ec
->directories
+ dt
);
4314 cc
= unit_get_cgroup_context(u
);
4317 if (ec
->private_devices
&&
4318 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4319 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4321 /* Only add these if needed, as they imply that everything else is blocked. */
4322 if (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
) {
4323 if (ec
->root_image
|| ec
->mount_images
) {
4325 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4326 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4327 r
= cgroup_context_add_device_allow(cc
, p
, CGROUP_DEVICE_READ
|CGROUP_DEVICE_WRITE
);
4331 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4332 r
= cgroup_context_add_device_allow(cc
, p
, CGROUP_DEVICE_READ
|CGROUP_DEVICE_WRITE
|CGROUP_DEVICE_MKNOD
);
4337 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4338 * Same for mapper and verity. */
4339 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4340 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4346 if (ec
->protect_clock
) {
4347 r
= cgroup_context_add_device_allow(cc
, "char-rtc", CGROUP_DEVICE_READ
);
4352 /* If there are encrypted credentials we might need to access the TPM. */
4353 if (exec_context_has_encrypted_credentials(ec
)) {
4354 r
= cgroup_context_add_device_allow(cc
, "char-tpm", CGROUP_DEVICE_READ
|CGROUP_DEVICE_WRITE
);
4364 ExecContext
*unit_get_exec_context(const Unit
*u
) {
4371 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4375 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4378 KillContext
*unit_get_kill_context(Unit
*u
) {
4385 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4389 return (KillContext
*) ((uint8_t*) u
+ offset
);
4392 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4398 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4402 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4405 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4411 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4415 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4418 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4421 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4424 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4425 return u
->manager
->lookup_paths
.transient
;
4427 if (flags
& UNIT_PERSISTENT
)
4428 return u
->manager
->lookup_paths
.persistent_control
;
4430 if (flags
& UNIT_RUNTIME
)
4431 return u
->manager
->lookup_paths
.runtime_control
;
4436 const char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4438 assert(popcount(flags
& (UNIT_ESCAPE_EXEC_SYNTAX_ENV
| UNIT_ESCAPE_EXEC_SYNTAX
| UNIT_ESCAPE_C
)) <= 1);
4441 _cleanup_free_
char *t
= NULL
;
4443 /* Returns a string with any escaping done. If no escaping was necessary, *buf is set to NULL, and
4444 * the input pointer is returned as-is. If an allocation was needed, the return buffer pointer is
4445 * written to *buf. This means the return value always contains a properly escaped version, but *buf
4446 * only contains a pointer if an allocation was made. Callers can use this to optimize memory
4449 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4450 t
= specifier_escape(s
);
4457 /* We either do C-escaping or shell-escaping, to additionally escape characters that we parse for
4458 * ExecStart= and friends, i.e. '$' and quotes. */
4460 if (flags
& (UNIT_ESCAPE_EXEC_SYNTAX_ENV
| UNIT_ESCAPE_EXEC_SYNTAX
)) {
4463 if (flags
& UNIT_ESCAPE_EXEC_SYNTAX_ENV
) {
4464 t2
= strreplace(s
, "$", "$$");
4467 free_and_replace(t
, t2
);
4470 t2
= shell_escape(t
?: s
, "\"");
4473 free_and_replace(t
, t2
);
4477 } else if (flags
& UNIT_ESCAPE_C
) {
4483 free_and_replace(t
, t2
);
4492 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4493 _cleanup_free_
char *result
= NULL
;
4496 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command
4497 * lines in a way suitable for ExecStart= stanzas. */
4499 STRV_FOREACH(i
, l
) {
4500 _cleanup_free_
char *buf
= NULL
;
4505 p
= unit_escape_setting(*i
, flags
, &buf
);
4509 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4510 if (!GREEDY_REALLOC(result
, n
+ a
+ 1))
4524 if (!GREEDY_REALLOC(result
, n
+ 1))
4529 return TAKE_PTR(result
);
4532 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4533 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4534 const char *dir
, *wrapped
;
4541 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4544 data
= unit_escape_setting(data
, flags
, &escaped
);
4548 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4549 * previous section header is the same */
4551 if (flags
& UNIT_PRIVATE
) {
4552 if (!UNIT_VTABLE(u
)->private_section
)
4555 if (!u
->transient_file
|| u
->last_section_private
< 0)
4556 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4557 else if (u
->last_section_private
== 0)
4558 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4560 if (!u
->transient_file
|| u
->last_section_private
< 0)
4561 data
= strjoina("[Unit]\n", data
);
4562 else if (u
->last_section_private
> 0)
4563 data
= strjoina("\n[Unit]\n", data
);
4566 if (u
->transient_file
) {
4567 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4568 * write to the transient unit file. */
4569 fputs(data
, u
->transient_file
);
4571 if (!endswith(data
, "\n"))
4572 fputc('\n', u
->transient_file
);
4574 /* Remember which section we wrote this entry to */
4575 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4579 dir
= unit_drop_in_dir(u
, flags
);
4583 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4584 "# or an equivalent operation. Do not edit.\n",
4588 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4592 (void) mkdir_p_label(p
, 0755);
4594 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4595 * recreate the cache after every drop-in we write. */
4596 if (u
->manager
->unit_path_cache
) {
4597 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4602 r
= write_string_file_atomic_label(q
, wrapped
);
4606 r
= strv_push(&u
->dropin_paths
, q
);
4611 strv_uniq(u
->dropin_paths
);
4613 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4618 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4619 _cleanup_free_
char *p
= NULL
;
4627 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4630 va_start(ap
, format
);
4631 r
= vasprintf(&p
, format
, ap
);
4637 return unit_write_setting(u
, flags
, name
, p
);
4640 int unit_make_transient(Unit
*u
) {
4641 _cleanup_free_
char *path
= NULL
;
4646 if (!UNIT_VTABLE(u
)->can_transient
)
4649 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4651 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4655 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4656 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4659 f
= fopen(path
, "we");
4664 safe_fclose(u
->transient_file
);
4665 u
->transient_file
= f
;
4667 free_and_replace(u
->fragment_path
, path
);
4669 u
->source_path
= mfree(u
->source_path
);
4670 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4671 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4673 u
->load_state
= UNIT_STUB
;
4675 u
->transient
= true;
4677 unit_add_to_dbus_queue(u
);
4678 unit_add_to_gc_queue(u
);
4680 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4686 static int log_kill(const PidRef
*pid
, int sig
, void *userdata
) {
4687 _cleanup_free_
char *comm
= NULL
;
4689 assert(pidref_is_set(pid
));
4691 (void) pidref_get_comm(pid
, &comm
);
4693 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4694 only, like for example systemd's own PAM stub process. */
4695 if (comm
&& comm
[0] == '(')
4696 /* Although we didn't log anything, as this callback is used in unit_kill_context we must return 1
4697 * here to let the manager know that a process was killed. */
4700 log_unit_notice(userdata
,
4701 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4704 signal_to_string(sig
));
4709 static int operation_to_signal(
4710 const KillContext
*c
,
4712 bool *ret_noteworthy
) {
4718 case KILL_TERMINATE
:
4719 case KILL_TERMINATE_AND_LOG
:
4720 *ret_noteworthy
= false;
4721 return c
->kill_signal
;
4724 *ret_noteworthy
= false;
4725 return restart_kill_signal(c
);
4728 *ret_noteworthy
= true;
4729 return c
->final_kill_signal
;
4732 *ret_noteworthy
= true;
4733 return c
->watchdog_signal
;
4736 assert_not_reached();
4740 int unit_kill_context(
4745 PidRef
* control_pid
,
4746 bool main_pid_alien
) {
4748 bool wait_for_exit
= false, send_sighup
;
4749 cg_kill_log_func_t log_func
= NULL
;
4755 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
4756 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
4757 * which is used for user-requested killing of unit processes. */
4759 if (c
->kill_mode
== KILL_NONE
)
4763 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4765 log_func
= log_kill
;
4769 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4772 if (pidref_is_set(main_pid
)) {
4774 log_func(main_pid
, sig
, u
);
4776 r
= pidref_kill_and_sigcont(main_pid
, sig
);
4777 if (r
< 0 && r
!= -ESRCH
) {
4778 _cleanup_free_
char *comm
= NULL
;
4779 (void) pidref_get_comm(main_pid
, &comm
);
4781 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
->pid
, strna(comm
));
4783 if (!main_pid_alien
)
4784 wait_for_exit
= true;
4786 if (r
!= -ESRCH
&& send_sighup
)
4787 (void) pidref_kill(main_pid
, SIGHUP
);
4791 if (pidref_is_set(control_pid
)) {
4793 log_func(control_pid
, sig
, u
);
4795 r
= pidref_kill_and_sigcont(control_pid
, sig
);
4796 if (r
< 0 && r
!= -ESRCH
) {
4797 _cleanup_free_
char *comm
= NULL
;
4798 (void) pidref_get_comm(control_pid
, &comm
);
4800 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
->pid
, strna(comm
));
4802 wait_for_exit
= true;
4804 if (r
!= -ESRCH
&& send_sighup
)
4805 (void) pidref_kill(control_pid
, SIGHUP
);
4809 if (u
->cgroup_path
&&
4810 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4811 _cleanup_set_free_ Set
*pid_set
= NULL
;
4813 /* Exclude the main/control pids from being killed via the cgroup */
4814 pid_set
= unit_pid_set(main_pid
? main_pid
->pid
: 0, control_pid
? control_pid
->pid
: 0);
4818 r
= cg_kill_recursive(
4821 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4825 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4826 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
4830 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4831 * we are running in a container or if this is a delegation unit, simply because cgroup
4832 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4833 * of containers it can be confused easily by left-over directories in the cgroup — which
4834 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4835 * there we get proper events. Hence rely on them. */
4837 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4838 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4839 wait_for_exit
= true;
4844 pid_set
= unit_pid_set(main_pid
? main_pid
->pid
: 0, control_pid
? control_pid
->pid
: 0);
4848 (void) cg_kill_recursive(
4853 /* kill_log= */ NULL
,
4854 /* userdata= */ NULL
);
4859 return wait_for_exit
;
4862 int unit_add_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
, UnitMountDependencyType type
) {
4863 Hashmap
**unit_map
, **manager_map
;
4868 assert(type
>= 0 && type
< _UNIT_MOUNT_DEPENDENCY_TYPE_MAX
);
4870 unit_map
= &u
->mounts_for
[type
];
4871 manager_map
= &u
->manager
->units_needing_mounts_for
[type
];
4873 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these
4874 * paths in the unit (from the path to the UnitDependencyInfo structure indicating how to the
4875 * dependency came to be). However, we build a prefix table for all possible prefixes so that new
4876 * appearing mount units can easily determine which units to make themselves a dependency of. */
4878 if (!path_is_absolute(path
))
4881 if (hashmap_contains(*unit_map
, path
)) /* Exit quickly if the path is already covered. */
4884 /* Use the canonical form of the path as the stored key. We call path_is_normalized()
4885 * only after simplification, since path_is_normalized() rejects paths with '.'.
4886 * path_is_normalized() also verifies that the path fits in PATH_MAX. */
4887 _cleanup_free_
char *p
= NULL
;
4888 r
= path_simplify_alloc(path
, &p
);
4893 if (!path_is_normalized(path
))
4896 UnitDependencyInfo di
= {
4900 r
= hashmap_ensure_put(unit_map
, &path_hash_ops
, p
, di
.data
);
4904 TAKE_PTR(p
); /* path remains a valid pointer to the string stored in the hashmap */
4906 char prefix
[strlen(path
) + 1];
4907 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4910 x
= hashmap_get(*manager_map
, prefix
);
4912 _cleanup_free_
char *q
= NULL
;
4914 r
= hashmap_ensure_allocated(manager_map
, &path_hash_ops
);
4926 r
= hashmap_put(*manager_map
, q
, x
);
4942 int unit_setup_exec_runtime(Unit
*u
) {
4943 _cleanup_(exec_shared_runtime_unrefp
) ExecSharedRuntime
*esr
= NULL
;
4944 _cleanup_(dynamic_creds_unrefp
) DynamicCreds
*dcreds
= NULL
;
4945 _cleanup_set_free_ Set
*units
= NULL
;
4952 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4955 /* Check if there already is an ExecRuntime for this unit? */
4956 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4960 ec
= unit_get_exec_context(u
);
4963 r
= unit_get_transitive_dependency_set(u
, UNIT_ATOM_JOINS_NAMESPACE_OF
, &units
);
4967 /* Try to get it from somebody else */
4968 SET_FOREACH(other
, units
) {
4969 r
= exec_shared_runtime_acquire(u
->manager
, NULL
, other
->id
, false, &esr
);
4977 r
= exec_shared_runtime_acquire(u
->manager
, ec
, u
->id
, true, &esr
);
4982 if (ec
->dynamic_user
) {
4983 r
= dynamic_creds_make(u
->manager
, ec
->user
, ec
->group
, &dcreds
);
4988 r
= exec_runtime_make(u
, ec
, esr
, dcreds
, rt
);
4998 bool unit_type_supported(UnitType t
) {
4999 static int8_t cache
[_UNIT_TYPE_MAX
] = {}; /* -1: disabled, 1: enabled: 0: don't know */
5002 assert(t
>= 0 && t
< _UNIT_TYPE_MAX
);
5004 if (cache
[t
] == 0) {
5007 e
= strjoina("SYSTEMD_SUPPORT_", unit_type_to_string(t
));
5009 r
= getenv_bool(ascii_strupper(e
));
5010 if (r
< 0 && r
!= -ENXIO
)
5011 log_debug_errno(r
, "Failed to parse $%s, ignoring: %m", e
);
5013 cache
[t
] = r
== 0 ? -1 : 1;
5018 if (!unit_vtable
[t
]->supported
)
5021 return unit_vtable
[t
]->supported();
5024 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
5030 if (!unit_log_level_test(u
, LOG_NOTICE
))
5033 r
= dir_is_empty(where
, /* ignore_hidden_or_backup= */ false);
5034 if (r
> 0 || r
== -ENOTDIR
)
5037 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
5041 log_unit_struct(u
, LOG_NOTICE
,
5042 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
5043 LOG_UNIT_INVOCATION_ID(u
),
5044 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
5048 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
5049 _cleanup_free_
char *canonical_where
= NULL
;
5055 r
= chase(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
5057 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
5061 /* We will happily ignore a trailing slash (or any redundant slashes) */
5062 if (path_equal(where
, canonical_where
))
5065 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
5066 log_unit_struct(u
, LOG_ERR
,
5067 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
5068 LOG_UNIT_INVOCATION_ID(u
),
5069 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
5075 bool unit_is_pristine(Unit
*u
) {
5078 /* Check if the unit already exists or is already around, in a number of different ways. Note that to
5079 * cater for unit types such as slice, we are generally fine with units that are marked UNIT_LOADED
5080 * even though nothing was actually loaded, as those unit types don't require a file on disk.
5082 * Note that we don't check for drop-ins here, because we allow drop-ins for transient units
5083 * identically to non-transient units, both unit-specific and hierarchical. E.g. for a-b-c.service:
5084 * service.d/….conf, a-.service.d/….conf, a-b-.service.d/….conf, a-b-c.service.d/….conf.
5087 return IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) &&
5088 !u
->fragment_path
&&
5094 PidRef
* unit_control_pid(Unit
*u
) {
5097 if (UNIT_VTABLE(u
)->control_pid
)
5098 return UNIT_VTABLE(u
)->control_pid(u
);
5103 PidRef
* unit_main_pid(Unit
*u
) {
5106 if (UNIT_VTABLE(u
)->main_pid
)
5107 return UNIT_VTABLE(u
)->main_pid(u
);
5112 static void unit_modify_user_nft_set(Unit
*u
, bool add
, NFTSetSource source
, uint32_t element
) {
5117 if (!MANAGER_IS_SYSTEM(u
->manager
))
5121 c
= unit_get_cgroup_context(u
);
5125 if (!u
->manager
->fw_ctx
) {
5126 r
= fw_ctx_new_full(&u
->manager
->fw_ctx
, /* init_tables= */ false);
5130 assert(u
->manager
->fw_ctx
);
5133 FOREACH_ARRAY(nft_set
, c
->nft_set_context
.sets
, c
->nft_set_context
.n_sets
) {
5134 if (nft_set
->source
!= source
)
5137 r
= nft_set_element_modify_any(u
->manager
->fw_ctx
, add
, nft_set
->nfproto
, nft_set
->table
, nft_set
->set
, &element
, sizeof(element
));
5139 log_warning_errno(r
, "Failed to %s NFT set: family %s, table %s, set %s, ID %u, ignoring: %m",
5140 add
? "add" : "delete", nfproto_to_string(nft_set
->nfproto
), nft_set
->table
, nft_set
->set
, element
);
5142 log_debug("%s NFT set: family %s, table %s, set %s, ID %u",
5143 add
? "Added" : "Deleted", nfproto_to_string(nft_set
->nfproto
), nft_set
->table
, nft_set
->set
, element
);
5147 static void unit_unref_uid_internal(
5151 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
5155 assert(_manager_unref_uid
);
5157 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
5158 * gid_t are actually the same time, with the same validity rules.
5160 * Drops a reference to UID/GID from a unit. */
5162 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5163 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5165 if (!uid_is_valid(*ref_uid
))
5168 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
5169 *ref_uid
= UID_INVALID
;
5172 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
5175 unit_modify_user_nft_set(u
, /* add = */ false, NFT_SET_SOURCE_USER
, u
->ref_uid
);
5177 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
5180 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
5183 unit_modify_user_nft_set(u
, /* add = */ false, NFT_SET_SOURCE_GROUP
, u
->ref_gid
);
5185 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
5188 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
5191 unit_unref_uid(u
, destroy_now
);
5192 unit_unref_gid(u
, destroy_now
);
5195 static int unit_ref_uid_internal(
5200 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
5206 assert(uid_is_valid(uid
));
5207 assert(_manager_ref_uid
);
5209 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
5210 * are actually the same type, and have the same validity rules.
5212 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
5213 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
5216 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
5217 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
5219 if (*ref_uid
== uid
)
5222 if (uid_is_valid(*ref_uid
)) /* Already set? */
5225 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
5233 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
5234 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
5237 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
5238 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
5241 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
5246 /* Reference both a UID and a GID in one go. Either references both, or neither. */
5248 if (uid_is_valid(uid
)) {
5249 r
= unit_ref_uid(u
, uid
, clean_ipc
);
5254 if (gid_is_valid(gid
)) {
5255 q
= unit_ref_gid(u
, gid
, clean_ipc
);
5258 unit_unref_uid(u
, false);
5264 return r
> 0 || q
> 0;
5267 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
5273 c
= unit_get_exec_context(u
);
5275 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
5277 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
5279 unit_modify_user_nft_set(u
, /* add = */ true, NFT_SET_SOURCE_USER
, uid
);
5280 unit_modify_user_nft_set(u
, /* add = */ true, NFT_SET_SOURCE_GROUP
, gid
);
5285 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
5290 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
5291 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
5292 * objects when no service references the UID/GID anymore. */
5294 r
= unit_ref_uid_gid(u
, uid
, gid
);
5296 unit_add_to_dbus_queue(u
);
5299 int unit_acquire_invocation_id(Unit
*u
) {
5305 r
= sd_id128_randomize(&id
);
5307 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
5309 r
= unit_set_invocation_id(u
, id
);
5311 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
5313 unit_add_to_dbus_queue(u
);
5317 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
5318 const char *confirm_spawn
;
5324 /* Copy parameters from manager */
5325 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
5329 p
->runtime_scope
= u
->manager
->runtime_scope
;
5331 confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
5332 if (confirm_spawn
) {
5333 p
->confirm_spawn
= strdup(confirm_spawn
);
5334 if (!p
->confirm_spawn
)
5338 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
5339 p
->prefix
= u
->manager
->prefix
;
5340 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
5342 /* Copy parameters from unit */
5343 p
->cgroup_path
= u
->cgroup_path
;
5344 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
5346 p
->received_credentials_directory
= u
->manager
->received_credentials_directory
;
5347 p
->received_encrypted_credentials_directory
= u
->manager
->received_encrypted_credentials_directory
;
5349 p
->shall_confirm_spawn
= u
->manager
->confirm_spawn
;
5351 p
->fallback_smack_process_label
= u
->manager
->defaults
.smack_process_label
;
5353 if (u
->manager
->restrict_fs
&& p
->bpf_outer_map_fd
< 0) {
5354 int fd
= lsm_bpf_map_restrict_fs_fd(u
);
5358 p
->bpf_outer_map_fd
= fd
;
5361 p
->user_lookup_fd
= u
->manager
->user_lookup_fds
[1];
5363 p
->cgroup_id
= u
->cgroup_id
;
5364 p
->invocation_id
= u
->invocation_id
;
5365 sd_id128_to_string(p
->invocation_id
, p
->invocation_id_string
);
5366 p
->unit_id
= strdup(u
->id
);
5373 int unit_fork_helper_process(Unit
*u
, const char *name
, PidRef
*ret
) {
5380 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5381 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5383 (void) unit_realize_cgroup(u
);
5385 r
= safe_fork(name
, FORK_REOPEN_LOG
|FORK_DEATHSIG_SIGTERM
, &pid
);
5389 _cleanup_(pidref_done
) PidRef pidref
= PIDREF_NULL
;
5394 q
= pidref_set_pid(&pidref
, pid
);
5398 *ret
= TAKE_PIDREF(pidref
);
5404 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
);
5405 (void) ignore_signals(SIGPIPE
);
5407 if (u
->cgroup_path
) {
5408 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5410 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", empty_to_root(u
->cgroup_path
));
5418 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, PidRef
*ret_pid
) {
5419 _cleanup_(pidref_done
) PidRef pid
= PIDREF_NULL
;
5425 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5429 int ret
= EXIT_SUCCESS
;
5431 STRV_FOREACH(i
, paths
) {
5432 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5434 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5442 r
= unit_watch_pidref(u
, &pid
, /* exclusive= */ true);
5446 *ret_pid
= TAKE_PIDREF(pid
);
5450 static void unit_update_dependency_mask(Hashmap
*deps
, Unit
*other
, UnitDependencyInfo di
) {
5454 if (di
.origin_mask
== 0 && di
.destination_mask
== 0)
5455 /* No bit set anymore, let's drop the whole entry */
5456 assert_se(hashmap_remove(deps
, other
));
5458 /* Mask was reduced, let's update the entry */
5459 assert_se(hashmap_update(deps
, other
, di
.data
) == 0);
5462 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5466 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5471 HASHMAP_FOREACH(deps
, u
->dependencies
) {
5475 UnitDependencyInfo di
;
5480 HASHMAP_FOREACH_KEY(di
.data
, other
, deps
) {
5481 Hashmap
*other_deps
;
5483 if (FLAGS_SET(~mask
, di
.origin_mask
))
5486 di
.origin_mask
&= ~mask
;
5487 unit_update_dependency_mask(deps
, other
, di
);
5489 /* We updated the dependency from our unit to the other unit now. But most
5490 * dependencies imply a reverse dependency. Hence, let's delete that one
5491 * too. For that we go through all dependency types on the other unit and
5492 * delete all those which point to us and have the right mask set. */
5494 HASHMAP_FOREACH(other_deps
, other
->dependencies
) {
5495 UnitDependencyInfo dj
;
5497 dj
.data
= hashmap_get(other_deps
, u
);
5498 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5501 dj
.destination_mask
&= ~mask
;
5502 unit_update_dependency_mask(other_deps
, u
, dj
);
5505 unit_add_to_gc_queue(other
);
5507 /* The unit 'other' may not be wanted by the unit 'u'. */
5508 unit_submit_to_stop_when_unneeded_queue(other
);
5518 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5525 if (MANAGER_IS_SYSTEM(u
->manager
))
5526 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5528 _cleanup_free_
char *user_path
= NULL
;
5529 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5532 p
= strjoin(user_path
, u
->id
);
5542 static int unit_export_invocation_id(Unit
*u
) {
5543 _cleanup_free_
char *p
= NULL
;
5548 if (u
->exported_invocation_id
)
5551 if (sd_id128_is_null(u
->invocation_id
))
5554 r
= unit_get_invocation_path(u
, &p
);
5556 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5558 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5560 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5562 u
->exported_invocation_id
= true;
5566 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5574 if (u
->exported_log_level_max
)
5577 if (c
->log_level_max
< 0)
5580 assert(c
->log_level_max
<= 7);
5582 buf
[0] = '0' + c
->log_level_max
;
5585 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5586 r
= symlink_atomic(buf
, p
);
5588 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5590 u
->exported_log_level_max
= true;
5594 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5595 _cleanup_close_
int fd
= -EBADF
;
5596 struct iovec
*iovec
;
5603 if (u
->exported_log_extra_fields
)
5606 if (c
->n_log_extra_fields
<= 0)
5609 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5610 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5612 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5613 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5615 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5616 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5619 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5620 pattern
= strjoina(p
, ".XXXXXX");
5622 fd
= mkostemp_safe(pattern
);
5624 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5626 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5628 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5632 (void) fchmod(fd
, 0644);
5634 if (rename(pattern
, p
) < 0) {
5635 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5639 u
->exported_log_extra_fields
= true;
5643 (void) unlink(pattern
);
5647 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5648 _cleanup_free_
char *buf
= NULL
;
5655 if (u
->exported_log_ratelimit_interval
)
5658 if (c
->log_ratelimit_interval_usec
== 0)
5661 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5663 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5666 r
= symlink_atomic(buf
, p
);
5668 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5670 u
->exported_log_ratelimit_interval
= true;
5674 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5675 _cleanup_free_
char *buf
= NULL
;
5682 if (u
->exported_log_ratelimit_burst
)
5685 if (c
->log_ratelimit_burst
== 0)
5688 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5690 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5693 r
= symlink_atomic(buf
, p
);
5695 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5697 u
->exported_log_ratelimit_burst
= true;
5701 void unit_export_state_files(Unit
*u
) {
5702 const ExecContext
*c
;
5709 if (MANAGER_IS_TEST_RUN(u
->manager
))
5712 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5713 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5714 * the IPC system itself and PID 1 also log to the journal.
5716 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5717 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5718 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5719 * namespace at least.
5721 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5722 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5725 (void) unit_export_invocation_id(u
);
5727 if (!MANAGER_IS_SYSTEM(u
->manager
))
5730 c
= unit_get_exec_context(u
);
5732 (void) unit_export_log_level_max(u
, c
);
5733 (void) unit_export_log_extra_fields(u
, c
);
5734 (void) unit_export_log_ratelimit_interval(u
, c
);
5735 (void) unit_export_log_ratelimit_burst(u
, c
);
5739 void unit_unlink_state_files(Unit
*u
) {
5747 /* Undoes the effect of unit_export_state() */
5749 if (u
->exported_invocation_id
) {
5750 _cleanup_free_
char *invocation_path
= NULL
;
5751 int r
= unit_get_invocation_path(u
, &invocation_path
);
5753 (void) unlink(invocation_path
);
5754 u
->exported_invocation_id
= false;
5758 if (!MANAGER_IS_SYSTEM(u
->manager
))
5761 if (u
->exported_log_level_max
) {
5762 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5765 u
->exported_log_level_max
= false;
5768 if (u
->exported_log_extra_fields
) {
5769 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5772 u
->exported_log_extra_fields
= false;
5775 if (u
->exported_log_ratelimit_interval
) {
5776 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5779 u
->exported_log_ratelimit_interval
= false;
5782 if (u
->exported_log_ratelimit_burst
) {
5783 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5786 u
->exported_log_ratelimit_burst
= false;
5790 int unit_prepare_exec(Unit
*u
) {
5795 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5796 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5797 r
= bpf_firewall_load_custom(u
);
5801 /* Prepares everything so that we can fork of a process for this unit */
5803 (void) unit_realize_cgroup(u
);
5805 if (u
->reset_accounting
) {
5806 (void) unit_reset_accounting(u
);
5807 u
->reset_accounting
= false;
5810 unit_export_state_files(u
);
5812 r
= unit_setup_exec_runtime(u
);
5819 static bool ignore_leftover_process(const char *comm
) {
5820 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5823 int unit_log_leftover_process_start(const PidRef
*pid
, int sig
, void *userdata
) {
5824 _cleanup_free_
char *comm
= NULL
;
5826 assert(pidref_is_set(pid
));
5828 (void) pidref_get_comm(pid
, &comm
);
5830 if (ignore_leftover_process(comm
))
5833 /* During start we print a warning */
5835 log_unit_warning(userdata
,
5836 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5837 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5838 pid
->pid
, strna(comm
));
5843 int unit_log_leftover_process_stop(const PidRef
*pid
, int sig
, void *userdata
) {
5844 _cleanup_free_
char *comm
= NULL
;
5846 assert(pidref_is_set(pid
));
5848 (void) pidref_get_comm(pid
, &comm
);
5850 if (ignore_leftover_process(comm
))
5853 /* During stop we only print an informational message */
5855 log_unit_info(userdata
,
5856 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
5857 pid
->pid
, strna(comm
));
5862 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
5865 (void) unit_pick_cgroup_path(u
);
5867 if (!u
->cgroup_path
)
5870 return cg_kill_recursive(
5879 bool unit_needs_console(Unit
*u
) {
5881 UnitActiveState state
;
5885 state
= unit_active_state(u
);
5887 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5890 if (UNIT_VTABLE(u
)->needs_console
)
5891 return UNIT_VTABLE(u
)->needs_console(u
);
5893 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5894 ec
= unit_get_exec_context(u
);
5898 return exec_context_may_touch_console(ec
);
5901 int unit_pid_attachable(Unit
*u
, PidRef
*pid
, sd_bus_error
*error
) {
5906 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5907 * and not a kernel thread either */
5909 /* First, a simple range check */
5910 if (!pidref_is_set(pid
))
5911 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier is not valid.");
5913 /* Some extra safety check */
5914 if (pid
->pid
== 1 || pidref_is_self(pid
))
5915 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
->pid
);
5917 /* Don't even begin to bother with kernel threads */
5918 r
= pidref_is_kernel_thread(pid
);
5920 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
->pid
);
5922 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
->pid
);
5924 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
->pid
);
5929 void unit_log_success(Unit
*u
) {
5932 /* Let's show message "Deactivated successfully" in debug mode (when manager is user) rather than in info mode.
5933 * This message has low information value for regular users and it might be a bit overwhelming on a system with
5934 * a lot of devices. */
5936 MANAGER_IS_USER(u
->manager
) ? LOG_DEBUG
: LOG_INFO
,
5937 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5938 LOG_UNIT_INVOCATION_ID(u
),
5939 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
5942 void unit_log_failure(Unit
*u
, const char *result
) {
5946 log_unit_struct(u
, LOG_WARNING
,
5947 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5948 LOG_UNIT_INVOCATION_ID(u
),
5949 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5950 "UNIT_RESULT=%s", result
);
5953 void unit_log_skip(Unit
*u
, const char *result
) {
5957 log_unit_struct(u
, LOG_INFO
,
5958 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5959 LOG_UNIT_INVOCATION_ID(u
),
5960 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5961 "UNIT_RESULT=%s", result
);
5964 void unit_log_process_exit(
5967 const char *command
,
5977 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5978 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5979 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5983 else if (code
== CLD_EXITED
)
5986 level
= LOG_WARNING
;
5988 log_unit_struct(u
, level
,
5989 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5990 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s%s",
5992 sigchld_code_to_string(code
), status
,
5993 strna(code
== CLD_EXITED
5994 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5995 : signal_to_string(status
)),
5996 success
? " (success)" : ""),
5997 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5998 "EXIT_STATUS=%i", status
,
5999 "COMMAND=%s", strna(command
),
6000 LOG_UNIT_INVOCATION_ID(u
));
6003 int unit_exit_status(Unit
*u
) {
6006 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
6007 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
6008 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
6009 * service process has exited abnormally (signal/coredump). */
6011 if (!UNIT_VTABLE(u
)->exit_status
)
6014 return UNIT_VTABLE(u
)->exit_status(u
);
6017 int unit_failure_action_exit_status(Unit
*u
) {
6022 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
6024 if (u
->failure_action_exit_status
>= 0)
6025 return u
->failure_action_exit_status
;
6027 r
= unit_exit_status(u
);
6028 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
6034 int unit_success_action_exit_status(Unit
*u
) {
6039 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
6041 if (u
->success_action_exit_status
>= 0)
6042 return u
->success_action_exit_status
;
6044 r
= unit_exit_status(u
);
6045 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
6051 int unit_test_trigger_loaded(Unit
*u
) {
6054 /* Tests whether the unit to trigger is loaded */
6056 trigger
= UNIT_TRIGGER(u
);
6058 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
6059 "Refusing to start, no unit to trigger.");
6060 if (trigger
->load_state
!= UNIT_LOADED
)
6061 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
6062 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
6067 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
6071 /* EXEC_PRESERVE_RESTART is handled via unit_release_resources()! */
6072 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
)
6073 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
6075 exec_context_destroy_credentials(u
);
6076 exec_context_destroy_mount_ns_dir(u
);
6079 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
6080 UnitActiveState state
;
6084 /* Special return values:
6086 * -EOPNOTSUPP → cleaning not supported for this unit type
6087 * -EUNATCH → cleaning not defined for this resource type
6088 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
6089 * a job queued or similar
6092 if (!UNIT_VTABLE(u
)->clean
)
6098 if (u
->load_state
!= UNIT_LOADED
)
6104 state
= unit_active_state(u
);
6105 if (state
!= UNIT_INACTIVE
)
6108 return UNIT_VTABLE(u
)->clean(u
, mask
);
6111 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
6114 if (!UNIT_VTABLE(u
)->clean
||
6115 u
->load_state
!= UNIT_LOADED
) {
6120 /* When the clean() method is set, can_clean() really should be set too */
6121 assert(UNIT_VTABLE(u
)->can_clean
);
6123 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
6126 bool unit_can_start_refuse_manual(Unit
*u
) {
6127 return unit_can_start(u
) && !u
->refuse_manual_start
;
6130 bool unit_can_stop_refuse_manual(Unit
*u
) {
6131 return unit_can_stop(u
) && !u
->refuse_manual_stop
;
6134 bool unit_can_isolate_refuse_manual(Unit
*u
) {
6135 return unit_can_isolate(u
) && !u
->refuse_manual_start
;
6138 bool unit_can_freeze(Unit
*u
) {
6141 if (UNIT_VTABLE(u
)->can_freeze
)
6142 return UNIT_VTABLE(u
)->can_freeze(u
);
6144 return UNIT_VTABLE(u
)->freeze
;
6147 void unit_frozen(Unit
*u
) {
6150 u
->freezer_state
= FREEZER_FROZEN
;
6152 bus_unit_send_pending_freezer_message(u
, false);
6155 void unit_thawed(Unit
*u
) {
6158 u
->freezer_state
= FREEZER_RUNNING
;
6160 bus_unit_send_pending_freezer_message(u
, false);
6163 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
6165 int (*method
)(Unit
*);
6169 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
6171 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
6172 if (!method
|| !cg_freezer_supported())
6178 if (u
->load_state
!= UNIT_LOADED
)
6181 s
= unit_active_state(u
);
6182 if (s
!= UNIT_ACTIVE
)
6185 if ((IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
) && action
== FREEZER_FREEZE
) ||
6186 (u
->freezer_state
== FREEZER_THAWING
&& action
== FREEZER_THAW
))
6193 assert(IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
));
6198 int unit_freeze(Unit
*u
) {
6199 return unit_freezer_action(u
, FREEZER_FREEZE
);
6202 int unit_thaw(Unit
*u
) {
6203 return unit_freezer_action(u
, FREEZER_THAW
);
6206 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
6207 int unit_freeze_vtable_common(Unit
*u
) {
6208 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
6211 int unit_thaw_vtable_common(Unit
*u
) {
6212 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
6215 Condition
*unit_find_failed_condition(Unit
*u
) {
6216 Condition
*failed_trigger
= NULL
;
6217 bool has_succeeded_trigger
= false;
6219 if (u
->condition_result
)
6222 LIST_FOREACH(conditions
, c
, u
->conditions
)
6224 if (c
->result
== CONDITION_SUCCEEDED
)
6225 has_succeeded_trigger
= true;
6226 else if (!failed_trigger
)
6228 } else if (c
->result
!= CONDITION_SUCCEEDED
)
6231 return failed_trigger
&& !has_succeeded_trigger
? failed_trigger
: NULL
;
6234 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
6235 [COLLECT_INACTIVE
] = "inactive",
6236 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
6239 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);
6241 Unit
* unit_has_dependency(const Unit
*u
, UnitDependencyAtom atom
, Unit
*other
) {
6246 /* Checks if the unit has a dependency on 'other' with the specified dependency atom. If 'other' is
6247 * NULL checks if the unit has *any* dependency of that atom. Returns 'other' if found (or if 'other'
6248 * is NULL the first entry found), or NULL if not found. */
6250 UNIT_FOREACH_DEPENDENCY(i
, u
, atom
)
6251 if (!other
|| other
== i
)
6257 int unit_get_dependency_array(const Unit
*u
, UnitDependencyAtom atom
, Unit
***ret_array
) {
6258 _cleanup_free_ Unit
**array
= NULL
;
6265 /* Gets a list of units matching a specific atom as array. This is useful when iterating through
6266 * dependencies while modifying them: the array is an "atomic snapshot" of sorts, that can be read
6267 * while the dependency table is continuously updated. */
6269 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
6270 if (!GREEDY_REALLOC(array
, n
+ 1))
6276 *ret_array
= TAKE_PTR(array
);
6278 assert(n
<= INT_MAX
);
6282 int unit_get_transitive_dependency_set(Unit
*u
, UnitDependencyAtom atom
, Set
**ret
) {
6283 _cleanup_set_free_ Set
*units
= NULL
, *queue
= NULL
;
6290 /* Similar to unit_get_dependency_array(), but also search the same dependency in other units. */
6293 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
6294 r
= set_ensure_put(&units
, NULL
, other
);
6299 r
= set_ensure_put(&queue
, NULL
, other
);
6303 } while ((u
= set_steal_first(queue
)));
6305 *ret
= TAKE_PTR(units
);
6311 sd_event_source
**source
,
6314 sd_event_time_handler_t handler
) {
6323 if (usec
== USEC_INFINITY
)
6324 return sd_event_source_set_enabled(*source
, SD_EVENT_OFF
);
6326 r
= (relative
? sd_event_source_set_time_relative
: sd_event_source_set_time
)(*source
, usec
);
6330 return sd_event_source_set_enabled(*source
, SD_EVENT_ONESHOT
);
6333 if (usec
== USEC_INFINITY
)
6336 r
= (relative
? sd_event_add_time_relative
: sd_event_add_time
)(
6346 const char *d
= strjoina(unit_type_to_string(u
->type
), "-timer");
6347 (void) sd_event_source_set_description(*source
, d
);
6352 static int unit_get_nice(Unit
*u
) {
6355 ec
= unit_get_exec_context(u
);
6356 return ec
? ec
->nice
: 0;
6359 static uint64_t unit_get_cpu_weight(Unit
*u
) {
6362 cc
= unit_get_cgroup_context(u
);
6363 return cc
? cgroup_context_cpu_weight(cc
, manager_state(u
->manager
)) : CGROUP_WEIGHT_DEFAULT
;
6366 int unit_compare_priority(Unit
*a
, Unit
*b
) {
6369 ret
= CMP(a
->type
, b
->type
);
6373 ret
= CMP(unit_get_cpu_weight(a
), unit_get_cpu_weight(b
));
6377 ret
= CMP(unit_get_nice(a
), unit_get_nice(b
));
6381 return strcmp(a
->id
, b
->id
);
6384 const ActivationDetailsVTable
* const activation_details_vtable
[_UNIT_TYPE_MAX
] = {
6385 [UNIT_PATH
] = &activation_details_path_vtable
,
6386 [UNIT_TIMER
] = &activation_details_timer_vtable
,
6389 ActivationDetails
*activation_details_new(Unit
*trigger_unit
) {
6390 _cleanup_free_ ActivationDetails
*details
= NULL
;
6392 assert(trigger_unit
);
6393 assert(trigger_unit
->type
!= _UNIT_TYPE_INVALID
);
6394 assert(trigger_unit
->id
);
6396 details
= malloc0(activation_details_vtable
[trigger_unit
->type
]->object_size
);
6400 *details
= (ActivationDetails
) {
6402 .trigger_unit_type
= trigger_unit
->type
,
6405 details
->trigger_unit_name
= strdup(trigger_unit
->id
);
6406 if (!details
->trigger_unit_name
)
6409 if (ACTIVATION_DETAILS_VTABLE(details
)->init
)
6410 ACTIVATION_DETAILS_VTABLE(details
)->init(details
, trigger_unit
);
6412 return TAKE_PTR(details
);
6415 static ActivationDetails
*activation_details_free(ActivationDetails
*details
) {
6419 if (ACTIVATION_DETAILS_VTABLE(details
)->done
)
6420 ACTIVATION_DETAILS_VTABLE(details
)->done(details
);
6422 free(details
->trigger_unit_name
);
6424 return mfree(details
);
6427 void activation_details_serialize(ActivationDetails
*details
, FILE *f
) {
6428 if (!details
|| details
->trigger_unit_type
== _UNIT_TYPE_INVALID
)
6431 (void) serialize_item(f
, "activation-details-unit-type", unit_type_to_string(details
->trigger_unit_type
));
6432 if (details
->trigger_unit_name
)
6433 (void) serialize_item(f
, "activation-details-unit-name", details
->trigger_unit_name
);
6434 if (ACTIVATION_DETAILS_VTABLE(details
)->serialize
)
6435 ACTIVATION_DETAILS_VTABLE(details
)->serialize(details
, f
);
6438 int activation_details_deserialize(const char *key
, const char *value
, ActivationDetails
**details
) {
6448 if (!streq(key
, "activation-details-unit-type"))
6451 t
= unit_type_from_string(value
);
6455 /* The activation details vtable has defined ops only for path and timer units */
6456 if (!activation_details_vtable
[t
])
6459 *details
= malloc0(activation_details_vtable
[t
]->object_size
);
6463 **details
= (ActivationDetails
) {
6465 .trigger_unit_type
= t
,
6471 if (streq(key
, "activation-details-unit-name")) {
6472 r
= free_and_strdup(&(*details
)->trigger_unit_name
, value
);
6479 if (ACTIVATION_DETAILS_VTABLE(*details
)->deserialize
)
6480 return ACTIVATION_DETAILS_VTABLE(*details
)->deserialize(key
, value
, details
);
6485 int activation_details_append_env(ActivationDetails
*details
, char ***strv
) {
6493 if (!isempty(details
->trigger_unit_name
)) {
6494 char *s
= strjoin("TRIGGER_UNIT=", details
->trigger_unit_name
);
6498 r
= strv_consume(strv
, TAKE_PTR(s
));
6503 if (ACTIVATION_DETAILS_VTABLE(details
)->append_env
) {
6504 r
= ACTIVATION_DETAILS_VTABLE(details
)->append_env(details
, strv
);
6509 return r
+ !isempty(details
->trigger_unit_name
); /* Return the number of variables added to the env block */
6512 int activation_details_append_pair(ActivationDetails
*details
, char ***strv
) {
6520 if (!isempty(details
->trigger_unit_name
)) {
6521 r
= strv_extend(strv
, "trigger_unit");
6525 r
= strv_extend(strv
, details
->trigger_unit_name
);
6530 if (ACTIVATION_DETAILS_VTABLE(details
)->append_env
) {
6531 r
= ACTIVATION_DETAILS_VTABLE(details
)->append_pair(details
, strv
);
6536 return r
+ !isempty(details
->trigger_unit_name
); /* Return the number of pairs added to the strv */
6539 DEFINE_TRIVIAL_REF_UNREF_FUNC(ActivationDetails
, activation_details
, activation_details_free
);
6541 static const char* const unit_mount_dependency_type_table
[_UNIT_MOUNT_DEPENDENCY_TYPE_MAX
] = {
6542 [UNIT_MOUNT_WANTS
] = "WantsMountsFor",
6543 [UNIT_MOUNT_REQUIRES
] = "RequiresMountsFor",
6546 DEFINE_STRING_TABLE_LOOKUP(unit_mount_dependency_type
, UnitMountDependencyType
);
6548 UnitDependency
unit_mount_dependency_type_to_dependency_type(UnitMountDependencyType t
) {
6551 case UNIT_MOUNT_WANTS
:
6554 case UNIT_MOUNT_REQUIRES
:
6555 return UNIT_REQUIRES
;
6558 assert_not_reached();