1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
9 #include "sd-messages.h"
11 #include "all-units.h"
12 #include "alloc-util.h"
13 #include "bpf-firewall.h"
14 #include "bpf-foreign.h"
15 #include "bpf-socket-bind.h"
16 #include "bus-common-errors.h"
18 #include "cgroup-setup.h"
19 #include "cgroup-util.h"
20 #include "chase-symlinks.h"
21 #include "core-varlink.h"
22 #include "dbus-unit.h"
28 #include "fileio-label.h"
30 #include "format-util.h"
31 #include "id128-util.h"
35 #include "load-dropin.h"
36 #include "load-fragment.h"
39 #include "missing_audit.h"
40 #include "mkdir-label.h"
41 #include "path-util.h"
42 #include "process-util.h"
45 #include "signal-util.h"
46 #include "sparse-endian.h"
48 #include "specifier.h"
49 #include "stat-util.h"
50 #include "stdio-util.h"
51 #include "string-table.h"
52 #include "string-util.h"
54 #include "terminal-util.h"
55 #include "tmpfile-util.h"
56 #include "umask-util.h"
57 #include "unit-name.h"
59 #include "user-util.h"
65 /* Thresholds for logging at INFO level about resource consumption */
66 #define MENTIONWORTHY_CPU_NSEC (1 * NSEC_PER_SEC)
67 #define MENTIONWORTHY_IO_BYTES (1024 * 1024ULL)
68 #define MENTIONWORTHY_IP_BYTES (0ULL)
70 /* Thresholds for logging at INFO level about resource consumption */
71 #define NOTICEWORTHY_CPU_NSEC (10*60 * NSEC_PER_SEC) /* 10 minutes */
72 #define NOTICEWORTHY_IO_BYTES (10 * 1024 * 1024ULL) /* 10 MB */
73 #define NOTICEWORTHY_IP_BYTES (128 * 1024 * 1024ULL) /* 128 MB */
75 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
76 [UNIT_SERVICE
] = &service_vtable
,
77 [UNIT_SOCKET
] = &socket_vtable
,
78 [UNIT_TARGET
] = &target_vtable
,
79 [UNIT_DEVICE
] = &device_vtable
,
80 [UNIT_MOUNT
] = &mount_vtable
,
81 [UNIT_AUTOMOUNT
] = &automount_vtable
,
82 [UNIT_SWAP
] = &swap_vtable
,
83 [UNIT_TIMER
] = &timer_vtable
,
84 [UNIT_PATH
] = &path_vtable
,
85 [UNIT_SLICE
] = &slice_vtable
,
86 [UNIT_SCOPE
] = &scope_vtable
,
89 Unit
* unit_new(Manager
*m
, size_t size
) {
93 assert(size
>= sizeof(Unit
));
100 u
->type
= _UNIT_TYPE_INVALID
;
101 u
->default_dependencies
= true;
102 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
103 u
->unit_file_preset
= -1;
104 u
->on_failure_job_mode
= JOB_REPLACE
;
105 u
->on_success_job_mode
= JOB_FAIL
;
106 u
->cgroup_control_inotify_wd
= -1;
107 u
->cgroup_memory_inotify_wd
= -1;
108 u
->job_timeout
= USEC_INFINITY
;
109 u
->job_running_timeout
= USEC_INFINITY
;
110 u
->ref_uid
= UID_INVALID
;
111 u
->ref_gid
= GID_INVALID
;
112 u
->cpu_usage_last
= NSEC_INFINITY
;
113 u
->cgroup_invalidated_mask
|= CGROUP_MASK_BPF_FIREWALL
;
114 u
->failure_action_exit_status
= u
->success_action_exit_status
= -1;
116 u
->ip_accounting_ingress_map_fd
= -1;
117 u
->ip_accounting_egress_map_fd
= -1;
118 for (CGroupIOAccountingMetric i
= 0; i
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; i
++)
119 u
->io_accounting_last
[i
] = UINT64_MAX
;
121 u
->ipv4_allow_map_fd
= -1;
122 u
->ipv6_allow_map_fd
= -1;
123 u
->ipv4_deny_map_fd
= -1;
124 u
->ipv6_deny_map_fd
= -1;
126 u
->last_section_private
= -1;
128 u
->start_ratelimit
= (RateLimit
) { m
->default_start_limit_interval
, m
->default_start_limit_burst
};
129 u
->auto_start_stop_ratelimit
= (RateLimit
) { 10 * USEC_PER_SEC
, 16 };
134 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
135 _cleanup_(unit_freep
) Unit
*u
= NULL
;
138 u
= unit_new(m
, size
);
142 r
= unit_add_name(u
, name
);
151 bool unit_has_name(const Unit
*u
, const char *name
) {
155 return streq_ptr(name
, u
->id
) ||
156 set_contains(u
->aliases
, name
);
159 static void unit_init(Unit
*u
) {
166 assert(u
->type
>= 0);
168 cc
= unit_get_cgroup_context(u
);
170 cgroup_context_init(cc
);
172 /* Copy in the manager defaults into the cgroup
173 * context, _before_ the rest of the settings have
174 * been initialized */
176 cc
->cpu_accounting
= u
->manager
->default_cpu_accounting
;
177 cc
->io_accounting
= u
->manager
->default_io_accounting
;
178 cc
->blockio_accounting
= u
->manager
->default_blockio_accounting
;
179 cc
->memory_accounting
= u
->manager
->default_memory_accounting
;
180 cc
->tasks_accounting
= u
->manager
->default_tasks_accounting
;
181 cc
->ip_accounting
= u
->manager
->default_ip_accounting
;
183 if (u
->type
!= UNIT_SLICE
)
184 cc
->tasks_max
= u
->manager
->default_tasks_max
;
187 ec
= unit_get_exec_context(u
);
189 exec_context_init(ec
);
191 if (u
->manager
->default_oom_score_adjust_set
) {
192 ec
->oom_score_adjust
= u
->manager
->default_oom_score_adjust
;
193 ec
->oom_score_adjust_set
= true;
196 if (MANAGER_IS_SYSTEM(u
->manager
))
197 ec
->keyring_mode
= EXEC_KEYRING_SHARED
;
199 ec
->keyring_mode
= EXEC_KEYRING_INHERIT
;
201 /* User manager might have its umask redefined by PAM or UMask=. In this
202 * case let the units it manages inherit this value by default. They can
203 * still tune this value through their own unit file */
204 (void) get_process_umask(getpid_cached(), &ec
->umask
);
208 kc
= unit_get_kill_context(u
);
210 kill_context_init(kc
);
212 if (UNIT_VTABLE(u
)->init
)
213 UNIT_VTABLE(u
)->init(u
);
216 static int unit_add_alias(Unit
*u
, char *donated_name
) {
219 /* Make sure that u->names is allocated. We may leave u->names
220 * empty if we fail later, but this is not a problem. */
221 r
= set_ensure_put(&u
->aliases
, &string_hash_ops
, donated_name
);
229 int unit_add_name(Unit
*u
, const char *text
) {
230 _cleanup_free_
char *name
= NULL
, *instance
= NULL
;
237 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
239 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
240 "instance is not set when adding name '%s': %m", text
);
242 r
= unit_name_replace_instance(text
, u
->instance
, &name
);
244 return log_unit_debug_errno(u
, r
,
245 "failed to build instance name from '%s': %m", text
);
252 if (unit_has_name(u
, name
))
255 if (hashmap_contains(u
->manager
->units
, name
))
256 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
257 "unit already exist when adding name '%s': %m", name
);
259 if (!unit_name_is_valid(name
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
260 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
261 "name '%s' is invalid: %m", name
);
263 t
= unit_name_to_type(name
);
265 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
266 "failed to derive unit type from name '%s': %m", name
);
268 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
269 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
270 "unit type is illegal: u->type(%d) and t(%d) for name '%s': %m",
273 r
= unit_name_to_instance(name
, &instance
);
275 return log_unit_debug_errno(u
, r
, "failed to extract instance from name '%s': %m", name
);
277 if (instance
&& !unit_type_may_template(t
))
278 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
), "templates are not allowed for name '%s': %m", name
);
280 /* Ensure that this unit either has no instance, or that the instance matches. */
281 if (u
->type
!= _UNIT_TYPE_INVALID
&& !streq_ptr(u
->instance
, instance
))
282 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
283 "cannot add name %s, the instances don't match (\"%s\" != \"%s\").",
284 name
, instance
, u
->instance
);
286 if (u
->id
&& !unit_type_may_alias(t
))
287 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(EEXIST
),
288 "cannot add name %s, aliases are not allowed for %s units.",
289 name
, unit_type_to_string(t
));
291 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
292 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(E2BIG
), "cannot add name, manager has too many units: %m");
294 /* Add name to the global hashmap first, because that's easier to undo */
295 r
= hashmap_put(u
->manager
->units
, name
, u
);
297 return log_unit_debug_errno(u
, r
, "add unit to hashmap failed for name '%s': %m", text
);
300 r
= unit_add_alias(u
, name
); /* unit_add_alias() takes ownership of the name on success */
302 hashmap_remove(u
->manager
->units
, name
);
308 /* A new name, we don't need the set yet. */
309 assert(u
->type
== _UNIT_TYPE_INVALID
);
310 assert(!u
->instance
);
313 u
->id
= TAKE_PTR(name
);
314 u
->instance
= TAKE_PTR(instance
);
316 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
320 unit_add_to_dbus_queue(u
);
324 int unit_choose_id(Unit
*u
, const char *name
) {
325 _cleanup_free_
char *t
= NULL
;
332 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
336 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
343 if (streq_ptr(u
->id
, name
))
344 return 0; /* Nothing to do. */
346 /* Selects one of the aliases of this unit as the id */
347 s
= set_get(u
->aliases
, (char*) name
);
352 r
= set_remove_and_put(u
->aliases
, name
, u
->id
);
356 assert_se(set_remove(u
->aliases
, name
)); /* see set_get() above… */
358 u
->id
= s
; /* Old u->id is now stored in the set, and s is not stored anywhere */
359 unit_add_to_dbus_queue(u
);
364 int unit_set_description(Unit
*u
, const char *description
) {
369 r
= free_and_strdup(&u
->description
, empty_to_null(description
));
373 unit_add_to_dbus_queue(u
);
378 static bool unit_success_failure_handler_has_jobs(Unit
*unit
) {
381 UNIT_FOREACH_DEPENDENCY(other
, unit
, UNIT_ATOM_ON_SUCCESS
)
382 if (other
->job
|| other
->nop_job
)
385 UNIT_FOREACH_DEPENDENCY(other
, unit
, UNIT_ATOM_ON_FAILURE
)
386 if (other
->job
|| other
->nop_job
)
392 bool unit_may_gc(Unit
*u
) {
393 UnitActiveState state
;
398 /* Checks whether the unit is ready to be unloaded for garbage collection.
399 * Returns true when the unit may be collected, and false if there's some
400 * reason to keep it loaded.
402 * References from other units are *not* checked here. Instead, this is done
403 * in unit_gc_sweep(), but using markers to properly collect dependency loops.
406 if (u
->job
|| u
->nop_job
)
409 state
= unit_active_state(u
);
411 /* If the unit is inactive and failed and no job is queued for it, then release its runtime resources */
412 if (UNIT_IS_INACTIVE_OR_FAILED(state
) &&
413 UNIT_VTABLE(u
)->release_resources
)
414 UNIT_VTABLE(u
)->release_resources(u
);
419 if (sd_bus_track_count(u
->bus_track
) > 0)
422 /* But we keep the unit object around for longer when it is referenced or configured to not be gc'ed */
423 switch (u
->collect_mode
) {
425 case COLLECT_INACTIVE
:
426 if (state
!= UNIT_INACTIVE
)
431 case COLLECT_INACTIVE_OR_FAILED
:
432 if (!IN_SET(state
, UNIT_INACTIVE
, UNIT_FAILED
))
438 assert_not_reached();
441 /* Check if any OnFailure= or on Success= jobs may be pending */
442 if (unit_success_failure_handler_has_jobs(u
))
445 if (u
->cgroup_path
) {
446 /* If the unit has a cgroup, then check whether there's anything in it. If so, we should stay
447 * around. Units with active processes should never be collected. */
449 r
= cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
);
451 log_unit_debug_errno(u
, r
, "Failed to determine whether cgroup %s is empty: %m", empty_to_root(u
->cgroup_path
));
456 if (UNIT_VTABLE(u
)->may_gc
&& !UNIT_VTABLE(u
)->may_gc(u
))
462 void unit_add_to_load_queue(Unit
*u
) {
464 assert(u
->type
!= _UNIT_TYPE_INVALID
);
466 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
469 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
470 u
->in_load_queue
= true;
473 void unit_add_to_cleanup_queue(Unit
*u
) {
476 if (u
->in_cleanup_queue
)
479 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
480 u
->in_cleanup_queue
= true;
483 void unit_add_to_gc_queue(Unit
*u
) {
486 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
492 LIST_PREPEND(gc_queue
, u
->manager
->gc_unit_queue
, u
);
493 u
->in_gc_queue
= true;
496 void unit_add_to_dbus_queue(Unit
*u
) {
498 assert(u
->type
!= _UNIT_TYPE_INVALID
);
500 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
503 /* Shortcut things if nobody cares */
504 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
505 sd_bus_track_count(u
->bus_track
) <= 0 &&
506 set_isempty(u
->manager
->private_buses
)) {
507 u
->sent_dbus_new_signal
= true;
511 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
512 u
->in_dbus_queue
= true;
515 void unit_submit_to_stop_when_unneeded_queue(Unit
*u
) {
518 if (u
->in_stop_when_unneeded_queue
)
521 if (!u
->stop_when_unneeded
)
524 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
527 LIST_PREPEND(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
528 u
->in_stop_when_unneeded_queue
= true;
531 void unit_submit_to_start_when_upheld_queue(Unit
*u
) {
534 if (u
->in_start_when_upheld_queue
)
537 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)))
540 if (!unit_has_dependency(u
, UNIT_ATOM_START_STEADILY
, NULL
))
543 LIST_PREPEND(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
544 u
->in_start_when_upheld_queue
= true;
547 void unit_submit_to_stop_when_bound_queue(Unit
*u
) {
550 if (u
->in_stop_when_bound_queue
)
553 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u
)))
556 if (!unit_has_dependency(u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
, NULL
))
559 LIST_PREPEND(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
560 u
->in_stop_when_bound_queue
= true;
563 static void unit_clear_dependencies(Unit
*u
) {
566 /* Removes all dependencies configured on u and their reverse dependencies. */
568 for (Hashmap
*deps
; (deps
= hashmap_steal_first(u
->dependencies
));) {
570 for (Unit
*other
; (other
= hashmap_steal_first_key(deps
));) {
573 HASHMAP_FOREACH(other_deps
, other
->dependencies
)
574 hashmap_remove(other_deps
, u
);
576 unit_add_to_gc_queue(other
);
582 u
->dependencies
= hashmap_free(u
->dependencies
);
585 static void unit_remove_transient(Unit
*u
) {
591 if (u
->fragment_path
)
592 (void) unlink(u
->fragment_path
);
594 STRV_FOREACH(i
, u
->dropin_paths
) {
595 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
597 p
= dirname_malloc(*i
); /* Get the drop-in directory from the drop-in file */
601 pp
= dirname_malloc(p
); /* Get the config directory from the drop-in directory */
605 /* Only drop transient drop-ins */
606 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
614 static void unit_free_requires_mounts_for(Unit
*u
) {
618 _cleanup_free_
char *path
= NULL
;
620 path
= hashmap_steal_first_key(u
->requires_mounts_for
);
624 char s
[strlen(path
) + 1];
626 PATH_FOREACH_PREFIX_MORE(s
, path
) {
630 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
634 (void) set_remove(x
, u
);
636 if (set_isempty(x
)) {
637 (void) hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
645 u
->requires_mounts_for
= hashmap_free(u
->requires_mounts_for
);
648 static void unit_done(Unit
*u
) {
657 if (UNIT_VTABLE(u
)->done
)
658 UNIT_VTABLE(u
)->done(u
);
660 ec
= unit_get_exec_context(u
);
662 exec_context_done(ec
);
664 cc
= unit_get_cgroup_context(u
);
666 cgroup_context_done(cc
);
669 Unit
* unit_free(Unit
*u
) {
676 u
->transient_file
= safe_fclose(u
->transient_file
);
678 if (!MANAGER_IS_RELOADING(u
->manager
))
679 unit_remove_transient(u
);
681 bus_unit_send_removed_signal(u
);
685 unit_dequeue_rewatch_pids(u
);
687 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
688 u
->bus_track
= sd_bus_track_unref(u
->bus_track
);
689 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
690 u
->pending_freezer_message
= sd_bus_message_unref(u
->pending_freezer_message
);
692 unit_free_requires_mounts_for(u
);
694 SET_FOREACH(t
, u
->aliases
)
695 hashmap_remove_value(u
->manager
->units
, t
, u
);
697 hashmap_remove_value(u
->manager
->units
, u
->id
, u
);
699 if (!sd_id128_is_null(u
->invocation_id
))
700 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
714 /* A unit is being dropped from the tree, make sure our family is realized properly. Do this after we
715 * detach the unit from slice tree in order to eliminate its effect on controller masks. */
716 slice
= UNIT_GET_SLICE(u
);
717 unit_clear_dependencies(u
);
719 unit_add_family_to_cgroup_realize_queue(slice
);
722 manager_unref_console(u
->manager
);
725 fdset_free(u
->initial_socket_bind_link_fds
);
727 bpf_link_free(u
->ipv4_socket_bind_link
);
728 bpf_link_free(u
->ipv6_socket_bind_link
);
731 unit_release_cgroup(u
);
733 if (!MANAGER_IS_RELOADING(u
->manager
))
734 unit_unlink_state_files(u
);
736 unit_unref_uid_gid(u
, false);
738 (void) manager_update_failed_units(u
->manager
, u
, false);
739 set_remove(u
->manager
->startup_units
, u
);
741 unit_unwatch_all_pids(u
);
743 while (u
->refs_by_target
)
744 unit_ref_unset(u
->refs_by_target
);
746 if (u
->type
!= _UNIT_TYPE_INVALID
)
747 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
749 if (u
->in_load_queue
)
750 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
752 if (u
->in_dbus_queue
)
753 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
755 if (u
->in_cleanup_queue
)
756 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
759 LIST_REMOVE(gc_queue
, u
->manager
->gc_unit_queue
, u
);
761 if (u
->in_cgroup_realize_queue
)
762 LIST_REMOVE(cgroup_realize_queue
, u
->manager
->cgroup_realize_queue
, u
);
764 if (u
->in_cgroup_empty_queue
)
765 LIST_REMOVE(cgroup_empty_queue
, u
->manager
->cgroup_empty_queue
, u
);
767 if (u
->in_cgroup_oom_queue
)
768 LIST_REMOVE(cgroup_oom_queue
, u
->manager
->cgroup_oom_queue
, u
);
770 if (u
->in_target_deps_queue
)
771 LIST_REMOVE(target_deps_queue
, u
->manager
->target_deps_queue
, u
);
773 if (u
->in_stop_when_unneeded_queue
)
774 LIST_REMOVE(stop_when_unneeded_queue
, u
->manager
->stop_when_unneeded_queue
, u
);
776 if (u
->in_start_when_upheld_queue
)
777 LIST_REMOVE(start_when_upheld_queue
, u
->manager
->start_when_upheld_queue
, u
);
779 if (u
->in_stop_when_bound_queue
)
780 LIST_REMOVE(stop_when_bound_queue
, u
->manager
->stop_when_bound_queue
, u
);
782 bpf_firewall_close(u
);
784 hashmap_free(u
->bpf_foreign_by_key
);
786 bpf_program_free(u
->bpf_device_control_installed
);
789 bpf_link_free(u
->restrict_ifaces_ingress_bpf_link
);
790 bpf_link_free(u
->restrict_ifaces_egress_bpf_link
);
792 fdset_free(u
->initial_restric_ifaces_link_fds
);
794 condition_free_list(u
->conditions
);
795 condition_free_list(u
->asserts
);
797 free(u
->description
);
798 strv_free(u
->documentation
);
799 free(u
->fragment_path
);
800 free(u
->source_path
);
801 strv_free(u
->dropin_paths
);
804 free(u
->job_timeout_reboot_arg
);
807 set_free_free(u
->aliases
);
813 FreezerState
unit_freezer_state(Unit
*u
) {
816 return u
->freezer_state
;
819 int unit_freezer_state_kernel(Unit
*u
, FreezerState
*ret
) {
820 char *values
[1] = {};
825 r
= cg_get_keyed_attribute(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, "cgroup.events",
826 STRV_MAKE("frozen"), values
);
830 r
= _FREEZER_STATE_INVALID
;
833 if (streq(values
[0], "0"))
835 else if (streq(values
[0], "1"))
845 UnitActiveState
unit_active_state(Unit
*u
) {
848 if (u
->load_state
== UNIT_MERGED
)
849 return unit_active_state(unit_follow_merge(u
));
851 /* After a reload it might happen that a unit is not correctly
852 * loaded but still has a process around. That's why we won't
853 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
855 return UNIT_VTABLE(u
)->active_state(u
);
858 const char* unit_sub_state_to_string(Unit
*u
) {
861 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
864 static int unit_merge_names(Unit
*u
, Unit
*other
) {
871 r
= unit_add_alias(u
, other
->id
);
875 r
= set_move(u
->aliases
, other
->aliases
);
877 set_remove(u
->aliases
, other
->id
);
882 other
->aliases
= set_free_free(other
->aliases
);
884 SET_FOREACH(name
, u
->aliases
)
885 assert_se(hashmap_replace(u
->manager
->units
, name
, u
) == 0);
890 static int unit_reserve_dependencies(Unit
*u
, Unit
*other
) {
899 /* Let's reserve some space in the dependency hashmaps so that later on merging the units cannot
902 * First make some room in the per dependency type hashmaps. Using the summed size of both unit's
903 * hashmaps is an estimate that is likely too high since they probably use some of the same
904 * types. But it's never too low, and that's all we need. */
906 n_reserve
= MIN(hashmap_size(other
->dependencies
), LESS_BY((size_t) _UNIT_DEPENDENCY_MAX
, hashmap_size(u
->dependencies
)));
908 r
= hashmap_ensure_allocated(&u
->dependencies
, NULL
);
912 r
= hashmap_reserve(u
->dependencies
, n_reserve
);
917 /* Now, enlarge our per dependency type hashmaps by the number of entries in the same hashmap of the
918 * other unit's dependencies.
920 * NB: If u does not have a dependency set allocated for some dependency type, there is no need to
921 * reserve anything for. In that case other's set will be transferred as a whole to u by
922 * complete_move(). */
924 HASHMAP_FOREACH_KEY(deps
, d
, u
->dependencies
) {
927 other_deps
= hashmap_get(other
->dependencies
, d
);
929 r
= hashmap_reserve(deps
, hashmap_size(other_deps
));
937 static void unit_maybe_warn_about_dependency(
939 const char *other_id
,
940 UnitDependency dependency
) {
944 /* Only warn about some unit types */
945 if (!IN_SET(dependency
,
956 if (streq_ptr(u
->id
, other_id
))
957 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
959 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other_id
), u
->id
);
962 static int unit_per_dependency_type_hashmap_update(
965 UnitDependencyMask origin_mask
,
966 UnitDependencyMask destination_mask
) {
968 UnitDependencyInfo info
;
972 assert_cc(sizeof(void*) == sizeof(info
));
974 /* Acquire the UnitDependencyInfo entry for the Unit* we are interested in, and update it if it
975 * exists, or insert it anew if not. */
977 info
.data
= hashmap_get(per_type
, other
);
979 /* Entry already exists. Add in our mask. */
981 if (FLAGS_SET(origin_mask
, info
.origin_mask
) &&
982 FLAGS_SET(destination_mask
, info
.destination_mask
))
985 info
.origin_mask
|= origin_mask
;
986 info
.destination_mask
|= destination_mask
;
988 r
= hashmap_update(per_type
, other
, info
.data
);
990 info
= (UnitDependencyInfo
) {
991 .origin_mask
= origin_mask
,
992 .destination_mask
= destination_mask
,
995 r
= hashmap_put(per_type
, other
, info
.data
);
1004 static int unit_add_dependency_hashmap(
1005 Hashmap
**dependencies
,
1008 UnitDependencyMask origin_mask
,
1009 UnitDependencyMask destination_mask
) {
1014 assert(dependencies
);
1016 assert(origin_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
1017 assert(destination_mask
< _UNIT_DEPENDENCY_MASK_FULL
);
1018 assert(origin_mask
> 0 || destination_mask
> 0);
1020 /* Ensure the top-level dependency hashmap exists that maps UnitDependency → Hashmap(Unit* →
1021 * UnitDependencyInfo) */
1022 r
= hashmap_ensure_allocated(dependencies
, NULL
);
1026 /* Acquire the inner hashmap, that maps Unit* → UnitDependencyInfo, for the specified dependency
1027 * type, and if it's missing allocate it and insert it. */
1028 per_type
= hashmap_get(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
));
1030 per_type
= hashmap_new(NULL
);
1034 r
= hashmap_put(*dependencies
, UNIT_DEPENDENCY_TO_PTR(d
), per_type
);
1036 hashmap_free(per_type
);
1041 return unit_per_dependency_type_hashmap_update(per_type
, other
, origin_mask
, destination_mask
);
1044 static void unit_merge_dependencies(
1057 _cleanup_(hashmap_freep
) Hashmap
*other_deps
= NULL
;
1058 UnitDependencyInfo di_back
;
1060 void *dt
; /* Actually of type UnitDependency, except that we don't bother casting it here,
1061 * since the hashmaps all want it as void pointer. */
1063 /* Let's focus on one dependency type at a time, that 'other' has defined. */
1064 other_deps
= hashmap_steal_first_key_and_value(other
->dependencies
, &dt
);
1068 /* Now iterate through all dependencies of this dependency type, of 'other'. We refer to the
1069 * referenced units as 'back'. */
1070 HASHMAP_FOREACH_KEY(di_back
.data
, back
, other_deps
) {
1075 /* This is a dependency pointing back to the unit we want to merge with?
1076 * Suppress it (but warn) */
1077 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1081 /* Now iterate through all deps of 'back', and fix the ones pointing to 'other' to
1082 * point to 'u' instead. */
1083 HASHMAP_FOREACH_KEY(back_deps
, back_dt
, back
->dependencies
) {
1084 UnitDependencyInfo di_move
;
1086 di_move
.data
= hashmap_remove(back_deps
, other
);
1090 assert_se(unit_per_dependency_type_hashmap_update(
1093 di_move
.origin_mask
,
1094 di_move
.destination_mask
) >= 0);
1098 /* Now all references towards 'other' of the current type 'dt' are corrected to point to
1099 * 'u'. Lets's now move the deps of type 'dt' from 'other' to 'u'. First, let's try to move
1100 * them per type wholesale. */
1101 r
= hashmap_put(u
->dependencies
, dt
, other_deps
);
1105 /* The target unit already has dependencies of this type, let's then merge this individually. */
1107 assert_se(deps
= hashmap_get(u
->dependencies
, dt
));
1110 UnitDependencyInfo di_move
;
1113 di_move
.data
= hashmap_steal_first_key_and_value(other_deps
, (void**) &back
);
1117 /* Would point back to us, ignore */
1118 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1122 assert_se(unit_per_dependency_type_hashmap_update(deps
, back
, di_move
.origin_mask
, di_move
.destination_mask
) >= 0);
1126 TAKE_PTR(other_deps
);
1128 if (hashmap_remove(other_deps
, u
))
1129 unit_maybe_warn_about_dependency(u
, other
->id
, UNIT_DEPENDENCY_FROM_PTR(dt
));
1133 other
->dependencies
= hashmap_free(other
->dependencies
);
1136 int unit_merge(Unit
*u
, Unit
*other
) {
1141 assert(u
->manager
== other
->manager
);
1142 assert(u
->type
!= _UNIT_TYPE_INVALID
);
1144 other
= unit_follow_merge(other
);
1149 if (u
->type
!= other
->type
)
1152 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
1155 if (!IN_SET(other
->load_state
, UNIT_STUB
, UNIT_NOT_FOUND
))
1158 if (!streq_ptr(u
->instance
, other
->instance
))
1167 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1170 /* Make reservations to ensure merge_dependencies() won't fail. We don't rollback reservations if we
1171 * fail. We don't have a way to undo reservations. A reservation is not a leak. */
1172 r
= unit_reserve_dependencies(u
, other
);
1177 r
= unit_merge_names(u
, other
);
1181 /* Redirect all references */
1182 while (other
->refs_by_target
)
1183 unit_ref_set(other
->refs_by_target
, other
->refs_by_target
->source
, u
);
1185 /* Merge dependencies */
1186 unit_merge_dependencies(u
, other
);
1188 other
->load_state
= UNIT_MERGED
;
1189 other
->merged_into
= u
;
1191 /* If there is still some data attached to the other node, we
1192 * don't need it anymore, and can free it. */
1193 if (other
->load_state
!= UNIT_STUB
)
1194 if (UNIT_VTABLE(other
)->done
)
1195 UNIT_VTABLE(other
)->done(other
);
1197 unit_add_to_dbus_queue(u
);
1198 unit_add_to_cleanup_queue(other
);
1203 int unit_merge_by_name(Unit
*u
, const char *name
) {
1204 _cleanup_free_
char *s
= NULL
;
1208 /* Either add name to u, or if a unit with name already exists, merge it with u.
1209 * If name is a template, do the same for name@instance, where instance is u's instance. */
1214 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
1218 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
1225 other
= manager_get_unit(u
->manager
, name
);
1227 return unit_merge(u
, other
);
1229 return unit_add_name(u
, name
);
1232 Unit
* unit_follow_merge(Unit
*u
) {
1235 while (u
->load_state
== UNIT_MERGED
)
1236 assert_se(u
= u
->merged_into
);
1241 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
1247 /* Unlike unit_add_dependency() or friends, this always returns 0 on success. */
1249 if (c
->working_directory
&& !c
->working_directory_missing_ok
) {
1250 r
= unit_require_mounts_for(u
, c
->working_directory
, UNIT_DEPENDENCY_FILE
);
1255 if (c
->root_directory
) {
1256 r
= unit_require_mounts_for(u
, c
->root_directory
, UNIT_DEPENDENCY_FILE
);
1261 if (c
->root_image
) {
1262 r
= unit_require_mounts_for(u
, c
->root_image
, UNIT_DEPENDENCY_FILE
);
1267 for (ExecDirectoryType dt
= 0; dt
< _EXEC_DIRECTORY_TYPE_MAX
; dt
++) {
1268 if (!u
->manager
->prefix
[dt
])
1271 for (size_t i
= 0; i
< c
->directories
[dt
].n_items
; i
++) {
1272 _cleanup_free_
char *p
= NULL
;
1274 p
= path_join(u
->manager
->prefix
[dt
], c
->directories
[dt
].items
[i
].path
);
1278 r
= unit_require_mounts_for(u
, p
, UNIT_DEPENDENCY_FILE
);
1284 if (!MANAGER_IS_SYSTEM(u
->manager
))
1287 /* For the following three directory types we need write access, and /var/ is possibly on the root
1288 * fs. Hence order after systemd-remount-fs.service, to ensure things are writable. */
1289 if (c
->directories
[EXEC_DIRECTORY_STATE
].n_items
> 0 ||
1290 c
->directories
[EXEC_DIRECTORY_CACHE
].n_items
> 0 ||
1291 c
->directories
[EXEC_DIRECTORY_LOGS
].n_items
> 0) {
1292 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_REMOUNT_FS_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1297 if (c
->private_tmp
) {
1299 /* FIXME: for now we make a special case for /tmp and add a weak dependency on
1300 * tmp.mount so /tmp being masked is supported. However there's no reason to treat
1301 * /tmp specifically and masking other mount units should be handled more
1302 * gracefully too, see PR#16894. */
1303 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "tmp.mount", true, UNIT_DEPENDENCY_FILE
);
1307 r
= unit_require_mounts_for(u
, "/var/tmp", UNIT_DEPENDENCY_FILE
);
1311 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_TMPFILES_SETUP_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1316 if (c
->root_image
) {
1317 /* We need to wait for /dev/loopX to appear when doing RootImage=, hence let's add an
1318 * implicit dependency on udev */
1320 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_UDEVD_SERVICE
, true, UNIT_DEPENDENCY_FILE
);
1325 if (!IN_SET(c
->std_output
,
1326 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1327 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1328 !IN_SET(c
->std_error
,
1329 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
1330 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
) &&
1334 /* If syslog or kernel logging is requested (or log namespacing is), make sure our own logging daemon
1337 if (c
->log_namespace
) {
1338 _cleanup_free_
char *socket_unit
= NULL
, *varlink_socket_unit
= NULL
;
1340 r
= unit_name_build_from_type("systemd-journald", c
->log_namespace
, UNIT_SOCKET
, &socket_unit
);
1344 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1348 r
= unit_name_build_from_type("systemd-journald-varlink", c
->log_namespace
, UNIT_SOCKET
, &varlink_socket_unit
);
1352 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, varlink_socket_unit
, true, UNIT_DEPENDENCY_FILE
);
1356 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, true, UNIT_DEPENDENCY_FILE
);
1363 const char* unit_description(Unit
*u
) {
1367 return u
->description
;
1369 return strna(u
->id
);
1372 const char* unit_status_string(Unit
*u
, char **ret_combined_buffer
) {
1376 /* Return u->id, u->description, or "{u->id} - {u->description}".
1377 * Versions with u->description are only used if it is set.
1378 * The last option is used if configured and the caller provided the 'ret_combined_buffer'
1381 * Note that *ret_combined_buffer may be set to NULL. */
1383 if (!u
->description
||
1384 u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_NAME
||
1385 (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& !ret_combined_buffer
) ||
1386 streq(u
->description
, u
->id
)) {
1388 if (ret_combined_buffer
)
1389 *ret_combined_buffer
= NULL
;
1393 if (ret_combined_buffer
) {
1394 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
) {
1395 *ret_combined_buffer
= strjoin(u
->id
, " - ", u
->description
);
1396 if (*ret_combined_buffer
)
1397 return *ret_combined_buffer
;
1398 log_oom(); /* Fall back to ->description */
1400 *ret_combined_buffer
= NULL
;
1403 return u
->description
;
1406 /* Common implementation for multiple backends */
1407 int unit_load_fragment_and_dropin(Unit
*u
, bool fragment_required
) {
1412 /* Load a .{service,socket,...} file */
1413 r
= unit_load_fragment(u
);
1417 if (u
->load_state
== UNIT_STUB
) {
1418 if (fragment_required
)
1421 u
->load_state
= UNIT_LOADED
;
1424 /* Load drop-in directory data. If u is an alias, we might be reloading the
1425 * target unit needlessly. But we cannot be sure which drops-ins have already
1426 * been loaded and which not, at least without doing complicated book-keeping,
1427 * so let's always reread all drop-ins. */
1428 r
= unit_load_dropin(unit_follow_merge(u
));
1432 if (u
->source_path
) {
1435 if (stat(u
->source_path
, &st
) >= 0)
1436 u
->source_mtime
= timespec_load(&st
.st_mtim
);
1438 u
->source_mtime
= 0;
1444 void unit_add_to_target_deps_queue(Unit
*u
) {
1445 Manager
*m
= u
->manager
;
1449 if (u
->in_target_deps_queue
)
1452 LIST_PREPEND(target_deps_queue
, m
->target_deps_queue
, u
);
1453 u
->in_target_deps_queue
= true;
1456 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1460 if (target
->type
!= UNIT_TARGET
)
1463 /* Only add the dependency if both units are loaded, so that
1464 * that loop check below is reliable */
1465 if (u
->load_state
!= UNIT_LOADED
||
1466 target
->load_state
!= UNIT_LOADED
)
1469 /* If either side wants no automatic dependencies, then let's
1471 if (!u
->default_dependencies
||
1472 !target
->default_dependencies
)
1475 /* Don't create loops */
1476 if (unit_has_dependency(target
, UNIT_ATOM_BEFORE
, u
))
1479 return unit_add_dependency(target
, UNIT_AFTER
, u
, true, UNIT_DEPENDENCY_DEFAULT
);
1482 static int unit_add_slice_dependencies(Unit
*u
) {
1486 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1489 /* Slice units are implicitly ordered against their parent slices (as this relationship is encoded in the
1490 name), while all other units are ordered based on configuration (as in their case Slice= configures the
1492 UnitDependencyMask mask
= u
->type
== UNIT_SLICE
? UNIT_DEPENDENCY_IMPLICIT
: UNIT_DEPENDENCY_FILE
;
1494 slice
= UNIT_GET_SLICE(u
);
1496 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, slice
, true, mask
);
1498 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1501 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, true, mask
);
1504 static int unit_add_mount_dependencies(Unit
*u
) {
1505 UnitDependencyInfo di
;
1507 bool changed
= false;
1512 HASHMAP_FOREACH_KEY(di
.data
, path
, u
->requires_mounts_for
) {
1513 char prefix
[strlen(path
) + 1];
1515 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
1516 _cleanup_free_
char *p
= NULL
;
1519 r
= unit_name_from_path(prefix
, ".mount", &p
);
1520 if (IN_SET(r
, -EINVAL
, -ENAMETOOLONG
))
1521 continue; /* If the path cannot be converted to a mount unit name, then it's
1522 * not manageable as a unit by systemd, and hence we don't need a
1523 * dependency on it. Let's thus silently ignore the issue. */
1527 m
= manager_get_unit(u
->manager
, p
);
1529 /* Make sure to load the mount unit if it exists. If so the dependencies on
1530 * this unit will be added later during the loading of the mount unit. */
1531 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1537 if (m
->load_state
!= UNIT_LOADED
)
1540 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true, di
.origin_mask
);
1543 changed
= changed
|| r
> 0;
1545 if (m
->fragment_path
) {
1546 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true, di
.origin_mask
);
1549 changed
= changed
|| r
> 0;
1557 static int unit_add_oomd_dependencies(Unit
*u
) {
1563 if (!u
->default_dependencies
)
1566 c
= unit_get_cgroup_context(u
);
1570 wants_oomd
= (c
->moom_swap
== MANAGED_OOM_KILL
|| c
->moom_mem_pressure
== MANAGED_OOM_KILL
);
1574 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, "systemd-oomd.service", true, UNIT_DEPENDENCY_FILE
);
1577 static int unit_add_startup_units(Unit
*u
) {
1578 if (!unit_has_startup_cgroup_constraints(u
))
1581 return set_ensure_put(&u
->manager
->startup_units
, NULL
, u
);
1584 static int unit_validate_on_failure_job_mode(
1586 const char *job_mode_setting
,
1588 const char *dependency_name
,
1589 UnitDependencyAtom atom
) {
1591 Unit
*other
, *found
= NULL
;
1593 if (job_mode
!= JOB_ISOLATE
)
1596 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
1599 else if (found
!= other
)
1600 return log_unit_error_errno(
1601 u
, SYNTHETIC_ERRNO(ENOEXEC
),
1602 "More than one %s dependencies specified but %sisolate set. Refusing.",
1603 dependency_name
, job_mode_setting
);
1609 int unit_load(Unit
*u
) {
1614 if (u
->in_load_queue
) {
1615 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1616 u
->in_load_queue
= false;
1619 if (u
->type
== _UNIT_TYPE_INVALID
)
1622 if (u
->load_state
!= UNIT_STUB
)
1625 if (u
->transient_file
) {
1626 /* Finalize transient file: if this is a transient unit file, as soon as we reach unit_load() the setup
1627 * is complete, hence let's synchronize the unit file we just wrote to disk. */
1629 r
= fflush_and_check(u
->transient_file
);
1633 u
->transient_file
= safe_fclose(u
->transient_file
);
1634 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1637 r
= UNIT_VTABLE(u
)->load(u
);
1641 assert(u
->load_state
!= UNIT_STUB
);
1643 if (u
->load_state
== UNIT_LOADED
) {
1644 unit_add_to_target_deps_queue(u
);
1646 r
= unit_add_slice_dependencies(u
);
1650 r
= unit_add_mount_dependencies(u
);
1654 r
= unit_add_oomd_dependencies(u
);
1658 r
= unit_add_startup_units(u
);
1662 r
= unit_validate_on_failure_job_mode(u
, "OnSuccessJobMode=", u
->on_success_job_mode
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
);
1666 r
= unit_validate_on_failure_job_mode(u
, "OnFailureJobMode=", u
->on_failure_job_mode
, "OnFailure=", UNIT_ATOM_ON_FAILURE
);
1670 if (u
->job_running_timeout
!= USEC_INFINITY
&& u
->job_running_timeout
> u
->job_timeout
)
1671 log_unit_warning(u
, "JobRunningTimeoutSec= is greater than JobTimeoutSec=, it has no effect.");
1673 /* We finished loading, let's ensure our parents recalculate the members mask */
1674 unit_invalidate_cgroup_members_masks(u
);
1677 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1679 unit_add_to_dbus_queue(unit_follow_merge(u
));
1680 unit_add_to_gc_queue(u
);
1681 (void) manager_varlink_send_managed_oom_update(u
);
1686 /* We convert ENOEXEC errors to the UNIT_BAD_SETTING load state here. Configuration parsing code
1687 * should hence return ENOEXEC to ensure units are placed in this state after loading. */
1689 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
:
1690 r
== -ENOEXEC
? UNIT_BAD_SETTING
:
1694 /* Record the timestamp on the cache, so that if the cache gets updated between now and the next time
1695 * an attempt is made to load this unit, we know we need to check again. */
1696 if (u
->load_state
== UNIT_NOT_FOUND
)
1697 u
->fragment_not_found_timestamp_hash
= u
->manager
->unit_cache_timestamp_hash
;
1699 unit_add_to_dbus_queue(u
);
1700 unit_add_to_gc_queue(u
);
1702 return log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1706 static int log_unit_internal(void *userdata
, int level
, int error
, const char *file
, int line
, const char *func
, const char *format
, ...) {
1711 if (u
&& !unit_log_level_test(u
, level
))
1712 return -ERRNO_VALUE(error
);
1714 va_start(ap
, format
);
1716 r
= log_object_internalv(level
, error
, file
, line
, func
,
1717 u
->manager
->unit_log_field
,
1719 u
->manager
->invocation_log_field
,
1720 u
->invocation_id_string
,
1723 r
= log_internalv(level
, error
, file
, line
, func
, format
, ap
);
1729 static bool unit_test_condition(Unit
*u
) {
1730 _cleanup_strv_free_
char **env
= NULL
;
1735 dual_timestamp_get(&u
->condition_timestamp
);
1737 r
= manager_get_effective_environment(u
->manager
, &env
);
1739 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1740 u
->condition_result
= true;
1742 u
->condition_result
= condition_test_list(
1745 condition_type_to_string
,
1749 unit_add_to_dbus_queue(u
);
1750 return u
->condition_result
;
1753 static bool unit_test_assert(Unit
*u
) {
1754 _cleanup_strv_free_
char **env
= NULL
;
1759 dual_timestamp_get(&u
->assert_timestamp
);
1761 r
= manager_get_effective_environment(u
->manager
, &env
);
1763 log_unit_error_errno(u
, r
, "Failed to determine effective environment: %m");
1764 u
->assert_result
= CONDITION_ERROR
;
1766 u
->assert_result
= condition_test_list(
1769 assert_type_to_string
,
1773 unit_add_to_dbus_queue(u
);
1774 return u
->assert_result
;
1777 void unit_status_printf(Unit
*u
, StatusType status_type
, const char *status
, const char *format
, const char *ident
) {
1778 if (log_get_show_color()) {
1779 if (u
->manager
->status_unit_format
== STATUS_UNIT_FORMAT_COMBINED
&& strchr(ident
, ' '))
1780 ident
= strjoina(ANSI_HIGHLIGHT
, u
->id
, ANSI_NORMAL
, " - ", u
->description
);
1782 ident
= strjoina(ANSI_HIGHLIGHT
, ident
, ANSI_NORMAL
);
1785 DISABLE_WARNING_FORMAT_NONLITERAL
;
1786 manager_status_printf(u
->manager
, status_type
, status
, format
, ident
);
1790 int unit_test_start_limit(Unit
*u
) {
1795 if (ratelimit_below(&u
->start_ratelimit
)) {
1796 u
->start_limit_hit
= false;
1800 log_unit_warning(u
, "Start request repeated too quickly.");
1801 u
->start_limit_hit
= true;
1803 reason
= strjoina("unit ", u
->id
, " failed");
1805 emergency_action(u
->manager
, u
->start_limit_action
,
1806 EMERGENCY_ACTION_IS_WATCHDOG
|EMERGENCY_ACTION_WARN
,
1807 u
->reboot_arg
, -1, reason
);
1812 bool unit_shall_confirm_spawn(Unit
*u
) {
1815 if (manager_is_confirm_spawn_disabled(u
->manager
))
1818 /* For some reasons units remaining in the same process group
1819 * as PID 1 fail to acquire the console even if it's not used
1820 * by any process. So skip the confirmation question for them. */
1821 return !unit_get_exec_context(u
)->same_pgrp
;
1824 static bool unit_verify_deps(Unit
*u
) {
1829 /* Checks whether all BindsTo= dependencies of this unit are fulfilled — if they are also combined
1830 * with After=. We do not check Requires= or Requisite= here as they only should have an effect on
1831 * the job processing, but do not have any effect afterwards. We don't check BindsTo= dependencies
1832 * that are not used in conjunction with After= as for them any such check would make things entirely
1835 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
1837 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
))
1840 if (!UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
1841 log_unit_notice(u
, "Bound to unit %s, but unit isn't active.", other
->id
);
1849 /* Errors that aren't really errors:
1850 * -EALREADY: Unit is already started.
1851 * -ECOMM: Condition failed
1852 * -EAGAIN: An operation is already in progress. Retry later.
1854 * Errors that are real errors:
1855 * -EBADR: This unit type does not support starting.
1856 * -ECANCELED: Start limit hit, too many requests for now
1857 * -EPROTO: Assert failed
1858 * -EINVAL: Unit not loaded
1859 * -EOPNOTSUPP: Unit type not supported
1860 * -ENOLINK: The necessary dependencies are not fulfilled.
1861 * -ESTALE: This unit has been started before and can't be started a second time
1862 * -ENOENT: This is a triggering unit and unit to trigger is not loaded
1864 int unit_start(Unit
*u
) {
1865 UnitActiveState state
;
1871 /* Let's hold off running start jobs for mount units when /proc/self/mountinfo monitor is rate limited. */
1872 if (u
->type
== UNIT_MOUNT
&& sd_event_source_is_ratelimited(u
->manager
->mount_event_source
))
1875 /* If this is already started, then this will succeed. Note that this will even succeed if this unit
1876 * is not startable by the user. This is relied on to detect when we need to wait for units and when
1877 * waiting is finished. */
1878 state
= unit_active_state(u
);
1879 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1881 if (state
== UNIT_MAINTENANCE
)
1884 /* Units that aren't loaded cannot be started */
1885 if (u
->load_state
!= UNIT_LOADED
)
1888 /* Refuse starting scope units more than once */
1889 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_enter_timestamp
))
1892 /* If the conditions failed, don't do anything at all. If we already are activating this call might
1893 * still be useful to speed up activation in case there is some hold-off time, but we don't want to
1894 * recheck the condition in that case. */
1895 if (state
!= UNIT_ACTIVATING
&&
1896 !unit_test_condition(u
))
1897 return log_unit_debug_errno(u
, SYNTHETIC_ERRNO(ECOMM
), "Starting requested but condition failed. Not starting unit.");
1899 /* If the asserts failed, fail the entire job */
1900 if (state
!= UNIT_ACTIVATING
&&
1901 !unit_test_assert(u
))
1902 return log_unit_notice_errno(u
, SYNTHETIC_ERRNO(EPROTO
), "Starting requested but asserts failed.");
1904 /* Units of types that aren't supported cannot be started. Note that we do this test only after the
1905 * condition checks, so that we rather return condition check errors (which are usually not
1906 * considered a true failure) than "not supported" errors (which are considered a failure).
1908 if (!unit_type_supported(u
->type
))
1911 /* Let's make sure that the deps really are in order before we start this. Normally the job engine
1912 * should have taken care of this already, but let's check this here again. After all, our
1913 * dependencies might not be in effect anymore, due to a reload or due to a failed condition. */
1914 if (!unit_verify_deps(u
))
1917 /* Forward to the main object, if we aren't it. */
1918 following
= unit_following(u
);
1920 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1921 return unit_start(following
);
1924 /* Check our ability to start early so that failure conditions don't cause us to enter a busy loop. */
1925 if (UNIT_VTABLE(u
)->can_start
) {
1926 r
= UNIT_VTABLE(u
)->can_start(u
);
1931 /* If it is stopped, but we cannot start it, then fail */
1932 if (!UNIT_VTABLE(u
)->start
)
1935 /* We don't suppress calls to ->start() here when we are already starting, to allow this request to
1936 * be used as a "hurry up" call, for example when the unit is in some "auto restart" state where it
1937 * waits for a holdoff timer to elapse before it will start again. */
1939 unit_add_to_dbus_queue(u
);
1940 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1942 return UNIT_VTABLE(u
)->start(u
);
1945 bool unit_can_start(Unit
*u
) {
1948 if (u
->load_state
!= UNIT_LOADED
)
1951 if (!unit_type_supported(u
->type
))
1954 /* Scope units may be started only once */
1955 if (UNIT_VTABLE(u
)->once_only
&& dual_timestamp_is_set(&u
->inactive_exit_timestamp
))
1958 return !!UNIT_VTABLE(u
)->start
;
1961 bool unit_can_isolate(Unit
*u
) {
1964 return unit_can_start(u
) &&
1969 * -EBADR: This unit type does not support stopping.
1970 * -EALREADY: Unit is already stopped.
1971 * -EAGAIN: An operation is already in progress. Retry later.
1973 int unit_stop(Unit
*u
) {
1974 UnitActiveState state
;
1979 state
= unit_active_state(u
);
1980 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1983 following
= unit_following(u
);
1985 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1986 return unit_stop(following
);
1989 if (!UNIT_VTABLE(u
)->stop
)
1992 unit_add_to_dbus_queue(u
);
1993 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
1995 return UNIT_VTABLE(u
)->stop(u
);
1998 bool unit_can_stop(Unit
*u
) {
2001 /* Note: if we return true here, it does not mean that the unit may be successfully stopped.
2002 * Extrinsic units follow external state and they may stop following external state changes
2003 * (hence we return true here), but an attempt to do this through the manager will fail. */
2005 if (!unit_type_supported(u
->type
))
2011 return !!UNIT_VTABLE(u
)->stop
;
2015 * -EBADR: This unit type does not support reloading.
2016 * -ENOEXEC: Unit is not started.
2017 * -EAGAIN: An operation is already in progress. Retry later.
2019 int unit_reload(Unit
*u
) {
2020 UnitActiveState state
;
2025 if (u
->load_state
!= UNIT_LOADED
)
2028 if (!unit_can_reload(u
))
2031 state
= unit_active_state(u
);
2032 if (state
== UNIT_RELOADING
)
2035 if (state
!= UNIT_ACTIVE
)
2036 return log_unit_warning_errno(u
, SYNTHETIC_ERRNO(ENOEXEC
), "Unit cannot be reloaded because it is inactive.");
2038 following
= unit_following(u
);
2040 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
2041 return unit_reload(following
);
2044 unit_add_to_dbus_queue(u
);
2046 if (!UNIT_VTABLE(u
)->reload
) {
2047 /* Unit doesn't have a reload function, but we need to propagate the reload anyway */
2048 unit_notify(u
, unit_active_state(u
), unit_active_state(u
), 0);
2052 unit_cgroup_freezer_action(u
, FREEZER_THAW
);
2054 return UNIT_VTABLE(u
)->reload(u
);
2057 bool unit_can_reload(Unit
*u
) {
2060 if (UNIT_VTABLE(u
)->can_reload
)
2061 return UNIT_VTABLE(u
)->can_reload(u
);
2063 if (unit_has_dependency(u
, UNIT_ATOM_PROPAGATES_RELOAD_TO
, NULL
))
2066 return UNIT_VTABLE(u
)->reload
;
2069 bool unit_is_unneeded(Unit
*u
) {
2073 if (!u
->stop_when_unneeded
)
2076 /* Don't clean up while the unit is transitioning or is even inactive. */
2077 if (unit_active_state(u
) != UNIT_ACTIVE
)
2082 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_PINS_STOP_WHEN_UNNEEDED
) {
2083 /* If a dependent unit has a job queued, is active or transitioning, or is marked for
2084 * restart, then don't clean this one up. */
2089 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
2092 if (unit_will_restart(other
))
2099 bool unit_is_upheld_by_active(Unit
*u
, Unit
**ret_culprit
) {
2104 /* Checks if the unit needs to be started because it currently is not running, but some other unit
2105 * that is active declared an Uphold= dependencies on it */
2107 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u
)) || u
->job
) {
2109 *ret_culprit
= NULL
;
2113 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_START_STEADILY
) {
2117 if (UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(other
))) {
2119 *ret_culprit
= other
;
2125 *ret_culprit
= NULL
;
2129 bool unit_is_bound_by_inactive(Unit
*u
, Unit
**ret_culprit
) {
2134 /* Checks whether this unit is bound to another unit that is inactive, i.e. whether we should stop
2135 * because the other unit is down. */
2137 if (unit_active_state(u
) != UNIT_ACTIVE
|| u
->job
) {
2138 /* Don't clean up while the unit is transitioning or is even inactive. */
2140 *ret_culprit
= NULL
;
2144 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_CANNOT_BE_ACTIVE_WITHOUT
) {
2148 if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
))) {
2150 *ret_culprit
= other
;
2157 *ret_culprit
= NULL
;
2161 static void check_unneeded_dependencies(Unit
*u
) {
2165 /* Add all units this unit depends on to the queue that processes StopWhenUnneeded= behaviour. */
2167 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_STOP_WHEN_UNNEEDED_QUEUE
)
2168 unit_submit_to_stop_when_unneeded_queue(other
);
2171 static void check_uphold_dependencies(Unit
*u
) {
2175 /* Add all units this unit depends on to the queue that processes Uphold= behaviour. */
2177 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_START_WHEN_UPHELD_QUEUE
)
2178 unit_submit_to_start_when_upheld_queue(other
);
2181 static void check_bound_by_dependencies(Unit
*u
) {
2185 /* Add all units this unit depends on to the queue that processes BindsTo= stop behaviour. */
2187 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_ADD_CANNOT_BE_ACTIVE_WITHOUT_QUEUE
)
2188 unit_submit_to_stop_when_bound_queue(other
);
2191 static void retroactively_start_dependencies(Unit
*u
) {
2195 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
2197 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_REPLACE
) /* Requires= + BindsTo= */
2198 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2199 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2200 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2202 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_START_FAIL
) /* Wants= */
2203 if (!unit_has_dependency(u
, UNIT_ATOM_AFTER
, other
) &&
2204 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
2205 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
, NULL
);
2207 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_START
) /* Conflicts= (and inverse) */
2208 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2209 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2212 static void retroactively_stop_dependencies(Unit
*u
) {
2216 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
2218 /* Pull down units which are bound to us recursively if enabled */
2219 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_RETROACTIVE_STOP_ON_STOP
) /* BoundBy= */
2220 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
2221 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
, NULL
);
2224 void unit_start_on_failure(
2226 const char *dependency_name
,
2227 UnitDependencyAtom atom
,
2235 assert(dependency_name
);
2236 assert(IN_SET(atom
, UNIT_ATOM_ON_SUCCESS
, UNIT_ATOM_ON_FAILURE
));
2238 /* Act on OnFailure= and OnSuccess= dependencies */
2240 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
2241 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
2244 log_unit_info(u
, "Triggering %s dependencies.", dependency_name
);
2248 r
= manager_add_job(u
->manager
, JOB_START
, other
, job_mode
, NULL
, &error
, NULL
);
2250 log_unit_warning_errno(
2251 u
, r
, "Failed to enqueue %s job, ignoring: %s",
2252 dependency_name
, bus_error_message(&error
, r
));
2257 log_unit_debug(u
, "Triggering %s dependencies done (%u %s).",
2258 dependency_name
, n_jobs
, n_jobs
== 1 ? "job" : "jobs");
2261 void unit_trigger_notify(Unit
*u
) {
2266 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_TRIGGERED_BY
)
2267 if (UNIT_VTABLE(other
)->trigger_notify
)
2268 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
2271 static int raise_level(int log_level
, bool condition_info
, bool condition_notice
) {
2272 if (condition_notice
&& log_level
> LOG_NOTICE
)
2274 if (condition_info
&& log_level
> LOG_INFO
)
2279 static int unit_log_resources(Unit
*u
) {
2280 struct iovec iovec
[1 + _CGROUP_IP_ACCOUNTING_METRIC_MAX
+ _CGROUP_IO_ACCOUNTING_METRIC_MAX
+ 4];
2281 bool any_traffic
= false, have_ip_accounting
= false, any_io
= false, have_io_accounting
= false;
2282 _cleanup_free_
char *igress
= NULL
, *egress
= NULL
, *rr
= NULL
, *wr
= NULL
;
2283 int log_level
= LOG_DEBUG
; /* May be raised if resources consumed over a threshold */
2284 size_t n_message_parts
= 0, n_iovec
= 0;
2285 char* message_parts
[1 + 2 + 2 + 1], *t
;
2286 nsec_t nsec
= NSEC_INFINITY
;
2288 const char* const ip_fields
[_CGROUP_IP_ACCOUNTING_METRIC_MAX
] = {
2289 [CGROUP_IP_INGRESS_BYTES
] = "IP_METRIC_INGRESS_BYTES",
2290 [CGROUP_IP_INGRESS_PACKETS
] = "IP_METRIC_INGRESS_PACKETS",
2291 [CGROUP_IP_EGRESS_BYTES
] = "IP_METRIC_EGRESS_BYTES",
2292 [CGROUP_IP_EGRESS_PACKETS
] = "IP_METRIC_EGRESS_PACKETS",
2294 const char* const io_fields
[_CGROUP_IO_ACCOUNTING_METRIC_MAX
] = {
2295 [CGROUP_IO_READ_BYTES
] = "IO_METRIC_READ_BYTES",
2296 [CGROUP_IO_WRITE_BYTES
] = "IO_METRIC_WRITE_BYTES",
2297 [CGROUP_IO_READ_OPERATIONS
] = "IO_METRIC_READ_OPERATIONS",
2298 [CGROUP_IO_WRITE_OPERATIONS
] = "IO_METRIC_WRITE_OPERATIONS",
2303 /* Invoked whenever a unit enters failed or dead state. Logs information about consumed resources if resource
2304 * accounting was enabled for a unit. It does this in two ways: a friendly human readable string with reduced
2305 * information and the complete data in structured fields. */
2307 (void) unit_get_cpu_usage(u
, &nsec
);
2308 if (nsec
!= NSEC_INFINITY
) {
2309 /* Format the CPU time for inclusion in the structured log message */
2310 if (asprintf(&t
, "CPU_USAGE_NSEC=%" PRIu64
, nsec
) < 0) {
2314 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2316 /* Format the CPU time for inclusion in the human language message string */
2317 t
= strjoin("consumed ", FORMAT_TIMESPAN(nsec
/ NSEC_PER_USEC
, USEC_PER_MSEC
), " CPU time");
2323 message_parts
[n_message_parts
++] = t
;
2325 log_level
= raise_level(log_level
,
2326 nsec
> MENTIONWORTHY_CPU_NSEC
,
2327 nsec
> NOTICEWORTHY_CPU_NSEC
);
2330 for (CGroupIOAccountingMetric k
= 0; k
< _CGROUP_IO_ACCOUNTING_METRIC_MAX
; k
++) {
2331 uint64_t value
= UINT64_MAX
;
2333 assert(io_fields
[k
]);
2335 (void) unit_get_io_accounting(u
, k
, k
> 0, &value
);
2336 if (value
== UINT64_MAX
)
2339 have_io_accounting
= true;
2343 /* Format IO accounting data for inclusion in the structured log message */
2344 if (asprintf(&t
, "%s=%" PRIu64
, io_fields
[k
], value
) < 0) {
2348 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2350 /* Format the IO accounting data for inclusion in the human language message string, but only
2351 * for the bytes counters (and not for the operations counters) */
2352 if (k
== CGROUP_IO_READ_BYTES
) {
2354 rr
= strjoin("read ", strna(FORMAT_BYTES(value
)), " from disk");
2359 } else if (k
== CGROUP_IO_WRITE_BYTES
) {
2361 wr
= strjoin("written ", strna(FORMAT_BYTES(value
)), " to disk");
2368 if (IN_SET(k
, CGROUP_IO_READ_BYTES
, CGROUP_IO_WRITE_BYTES
))
2369 log_level
= raise_level(log_level
,
2370 value
> MENTIONWORTHY_IO_BYTES
,
2371 value
> NOTICEWORTHY_IO_BYTES
);
2374 if (have_io_accounting
) {
2377 message_parts
[n_message_parts
++] = TAKE_PTR(rr
);
2379 message_parts
[n_message_parts
++] = TAKE_PTR(wr
);
2384 k
= strdup("no IO");
2390 message_parts
[n_message_parts
++] = k
;
2394 for (CGroupIPAccountingMetric m
= 0; m
< _CGROUP_IP_ACCOUNTING_METRIC_MAX
; m
++) {
2395 uint64_t value
= UINT64_MAX
;
2397 assert(ip_fields
[m
]);
2399 (void) unit_get_ip_accounting(u
, m
, &value
);
2400 if (value
== UINT64_MAX
)
2403 have_ip_accounting
= true;
2407 /* Format IP accounting data for inclusion in the structured log message */
2408 if (asprintf(&t
, "%s=%" PRIu64
, ip_fields
[m
], value
) < 0) {
2412 iovec
[n_iovec
++] = IOVEC_MAKE_STRING(t
);
2414 /* Format the IP accounting data for inclusion in the human language message string, but only for the
2415 * bytes counters (and not for the packets counters) */
2416 if (m
== CGROUP_IP_INGRESS_BYTES
) {
2418 igress
= strjoin("received ", strna(FORMAT_BYTES(value
)), " IP traffic");
2423 } else if (m
== CGROUP_IP_EGRESS_BYTES
) {
2425 egress
= strjoin("sent ", strna(FORMAT_BYTES(value
)), " IP traffic");
2432 if (IN_SET(m
, CGROUP_IP_INGRESS_BYTES
, CGROUP_IP_EGRESS_BYTES
))
2433 log_level
= raise_level(log_level
,
2434 value
> MENTIONWORTHY_IP_BYTES
,
2435 value
> NOTICEWORTHY_IP_BYTES
);
2438 /* This check is here because it is the earliest point following all possible log_level assignments. If
2439 * log_level is assigned anywhere after this point, move this check. */
2440 if (!unit_log_level_test(u
, log_level
)) {
2445 if (have_ip_accounting
) {
2448 message_parts
[n_message_parts
++] = TAKE_PTR(igress
);
2450 message_parts
[n_message_parts
++] = TAKE_PTR(egress
);
2455 k
= strdup("no IP traffic");
2461 message_parts
[n_message_parts
++] = k
;
2465 /* Is there any accounting data available at all? */
2471 if (n_message_parts
== 0)
2472 t
= strjoina("MESSAGE=", u
->id
, ": Completed.");
2474 _cleanup_free_
char *joined
= NULL
;
2476 message_parts
[n_message_parts
] = NULL
;
2478 joined
= strv_join(message_parts
, ", ");
2484 joined
[0] = ascii_toupper(joined
[0]);
2485 t
= strjoina("MESSAGE=", u
->id
, ": ", joined
, ".");
2488 /* The following four fields we allocate on the stack or are static strings, we hence don't want to free them,
2489 * and hence don't increase n_iovec for them */
2490 iovec
[n_iovec
] = IOVEC_MAKE_STRING(t
);
2491 iovec
[n_iovec
+ 1] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_UNIT_RESOURCES_STR
);
2493 t
= strjoina(u
->manager
->unit_log_field
, u
->id
);
2494 iovec
[n_iovec
+ 2] = IOVEC_MAKE_STRING(t
);
2496 t
= strjoina(u
->manager
->invocation_log_field
, u
->invocation_id_string
);
2497 iovec
[n_iovec
+ 3] = IOVEC_MAKE_STRING(t
);
2499 log_unit_struct_iovec(u
, log_level
, iovec
, n_iovec
+ 4);
2503 for (size_t i
= 0; i
< n_message_parts
; i
++)
2504 free(message_parts
[i
]);
2506 for (size_t i
= 0; i
< n_iovec
; i
++)
2507 free(iovec
[i
].iov_base
);
2513 static void unit_update_on_console(Unit
*u
) {
2518 b
= unit_needs_console(u
);
2519 if (u
->on_console
== b
)
2524 manager_ref_console(u
->manager
);
2526 manager_unref_console(u
->manager
);
2529 static void unit_emit_audit_start(Unit
*u
) {
2532 if (u
->type
!= UNIT_SERVICE
)
2535 /* Write audit record if we have just finished starting up */
2536 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
2540 static void unit_emit_audit_stop(Unit
*u
, UnitActiveState state
) {
2543 if (u
->type
!= UNIT_SERVICE
)
2547 /* Write audit record if we have just finished shutting down */
2548 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, state
== UNIT_INACTIVE
);
2549 u
->in_audit
= false;
2551 /* Hmm, if there was no start record written write it now, so that we always have a nice pair */
2552 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, state
== UNIT_INACTIVE
);
2554 if (state
== UNIT_INACTIVE
)
2555 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
2559 static bool unit_process_job(Job
*j
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2560 bool unexpected
= false;
2565 if (j
->state
== JOB_WAITING
)
2567 /* So we reached a different state for this job. Let's see if we can run it now if it failed previously
2569 job_add_to_run_queue(j
);
2571 /* Let's check whether the unit's new state constitutes a finished job, or maybe contradicts a running job and
2572 * hence needs to invalidate jobs. */
2577 case JOB_VERIFY_ACTIVE
:
2579 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2580 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2581 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
2584 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2585 if (ns
== UNIT_FAILED
)
2586 result
= JOB_FAILED
;
2590 job_finish_and_invalidate(j
, result
, true, false);
2597 case JOB_RELOAD_OR_START
:
2598 case JOB_TRY_RELOAD
:
2600 if (j
->state
== JOB_RUNNING
) {
2601 if (ns
== UNIT_ACTIVE
)
2602 job_finish_and_invalidate(j
, (flags
& UNIT_NOTIFY_RELOAD_FAILURE
) ? JOB_FAILED
: JOB_DONE
, true, false);
2603 else if (!IN_SET(ns
, UNIT_ACTIVATING
, UNIT_RELOADING
)) {
2606 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2607 job_finish_and_invalidate(j
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
2615 case JOB_TRY_RESTART
:
2617 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2618 job_finish_and_invalidate(j
, JOB_DONE
, true, false);
2619 else if (j
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2621 job_finish_and_invalidate(j
, JOB_FAILED
, true, false);
2627 assert_not_reached();
2633 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, UnitNotifyFlags flags
) {
2638 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
2639 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
2641 /* Note that this is called for all low-level state changes, even if they might map to the same high-level
2642 * UnitActiveState! That means that ns == os is an expected behavior here. For example: if a mount point is
2643 * remounted this function will be called too! */
2647 /* Let's enqueue the change signal early. In case this unit has a job associated we want that this unit is in
2648 * the bus queue, so that any job change signal queued will force out the unit change signal first. */
2649 unit_add_to_dbus_queue(u
);
2651 /* Update systemd-oomd on the property/state change */
2653 /* Always send an update if the unit is going into an inactive state so systemd-oomd knows to stop
2655 * Also send an update whenever the unit goes active; this is to handle a case where an override file
2656 * sets one of the ManagedOOM*= properties to "kill", then later removes it. systemd-oomd needs to
2657 * know to stop monitoring when the unit changes from "kill" -> "auto" on daemon-reload, but we don't
2658 * have the information on the property. Thus, indiscriminately send an update. */
2659 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) || UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2660 (void) manager_varlink_send_managed_oom_update(u
);
2663 /* Update timestamps for state changes */
2664 if (!MANAGER_IS_RELOADING(m
)) {
2665 dual_timestamp_get(&u
->state_change_timestamp
);
2667 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
2668 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
2669 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
2670 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
2672 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2673 u
->active_enter_timestamp
= u
->state_change_timestamp
;
2674 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
2675 u
->active_exit_timestamp
= u
->state_change_timestamp
;
2678 /* Keep track of failed units */
2679 (void) manager_update_failed_units(m
, u
, ns
== UNIT_FAILED
);
2681 /* Make sure the cgroup and state files are always removed when we become inactive */
2682 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2683 SET_FLAG(u
->markers
,
2684 (1u << UNIT_MARKER_NEEDS_RELOAD
)|(1u << UNIT_MARKER_NEEDS_RESTART
),
2686 unit_prune_cgroup(u
);
2687 unit_unlink_state_files(u
);
2688 } else if (ns
!= os
&& ns
== UNIT_RELOADING
)
2689 SET_FLAG(u
->markers
, 1u << UNIT_MARKER_NEEDS_RELOAD
, false);
2691 unit_update_on_console(u
);
2693 if (!MANAGER_IS_RELOADING(m
)) {
2696 /* Let's propagate state changes to the job */
2698 unexpected
= unit_process_job(u
->job
, ns
, flags
);
2702 /* If this state change happened without being requested by a job, then let's retroactively start or
2703 * stop dependencies. We skip that step when deserializing, since we don't want to create any
2704 * additional jobs just because something is already activated. */
2707 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2708 retroactively_start_dependencies(u
);
2709 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2710 retroactively_stop_dependencies(u
);
2713 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2714 log_unit_debug(u
, "Unit entered failed state.");
2716 if (!(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2717 unit_start_on_failure(u
, "OnFailure=", UNIT_ATOM_ON_FAILURE
, u
->on_failure_job_mode
);
2720 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
) && !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
2721 /* This unit just finished starting up */
2723 unit_emit_audit_start(u
);
2724 manager_send_unit_plymouth(m
, u
);
2727 if (UNIT_IS_INACTIVE_OR_FAILED(ns
) && !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
2728 /* This unit just stopped/failed. */
2730 unit_emit_audit_stop(u
, ns
);
2731 unit_log_resources(u
);
2734 if (ns
== UNIT_INACTIVE
&& !IN_SET(os
, UNIT_FAILED
, UNIT_INACTIVE
, UNIT_MAINTENANCE
) &&
2735 !(flags
& UNIT_NOTIFY_WILL_AUTO_RESTART
))
2736 unit_start_on_failure(u
, "OnSuccess=", UNIT_ATOM_ON_SUCCESS
, u
->on_success_job_mode
);
2739 manager_recheck_journal(m
);
2740 manager_recheck_dbus(m
);
2742 unit_trigger_notify(u
);
2744 if (!MANAGER_IS_RELOADING(m
)) {
2745 if (os
!= UNIT_FAILED
&& ns
== UNIT_FAILED
) {
2746 reason
= strjoina("unit ", u
->id
, " failed");
2747 emergency_action(m
, u
->failure_action
, 0, u
->reboot_arg
, unit_failure_action_exit_status(u
), reason
);
2748 } else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && ns
== UNIT_INACTIVE
) {
2749 reason
= strjoina("unit ", u
->id
, " succeeded");
2750 emergency_action(m
, u
->success_action
, 0, u
->reboot_arg
, unit_success_action_exit_status(u
), reason
);
2754 /* And now, add the unit or depending units to various queues that will act on the new situation if
2755 * needed. These queues generally check for continuous state changes rather than events (like most of
2756 * the state propagation above), and do work deferred instead of instantly, since they typically
2757 * don't want to run during reloading, and usually involve checking combined state of multiple units
2760 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
2761 /* Stop unneeded units and bound-by units regardless if going down was expected or not */
2762 check_unneeded_dependencies(u
);
2763 check_bound_by_dependencies(u
);
2765 /* Maybe someone wants us to remain up? */
2766 unit_submit_to_start_when_upheld_queue(u
);
2768 /* Maybe the unit should be GC'ed now? */
2769 unit_add_to_gc_queue(u
);
2772 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2773 /* Start uphold units regardless if going up was expected or not */
2774 check_uphold_dependencies(u
);
2776 /* Maybe we finished startup and are now ready for being stopped because unneeded? */
2777 unit_submit_to_stop_when_unneeded_queue(u
);
2779 /* Maybe we finished startup, but something we needed has vanished? Let's die then. (This happens
2780 * when something BindsTo= to a Type=oneshot unit, as these units go directly from starting to
2781 * inactive, without ever entering started.) */
2782 unit_submit_to_stop_when_bound_queue(u
);
2786 int unit_watch_pid(Unit
*u
, pid_t pid
, bool exclusive
) {
2790 assert(pid_is_valid(pid
));
2792 /* Watch a specific PID */
2794 /* Caller might be sure that this PID belongs to this unit only. Let's take this
2795 * opportunity to remove any stalled references to this PID as they can be created
2796 * easily (when watching a process which is not our direct child). */
2798 manager_unwatch_pid(u
->manager
, pid
);
2800 r
= set_ensure_allocated(&u
->pids
, NULL
);
2804 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids
, NULL
);
2808 /* First try, let's add the unit keyed by "pid". */
2809 r
= hashmap_put(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2815 /* OK, the "pid" key is already assigned to a different unit. Let's see if the "-pid" key (which points
2816 * to an array of Units rather than just a Unit), lists us already. */
2818 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2820 for (; array
[n
]; n
++)
2824 if (found
) /* Found it already? if so, do nothing */
2829 /* Allocate a new array */
2830 new_array
= new(Unit
*, n
+ 2);
2834 memcpy_safe(new_array
, array
, sizeof(Unit
*) * n
);
2836 new_array
[n
+1] = NULL
;
2838 /* Add or replace the old array */
2839 r
= hashmap_replace(u
->manager
->watch_pids
, PID_TO_PTR(-pid
), new_array
);
2850 r
= set_put(u
->pids
, PID_TO_PTR(pid
));
2857 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2861 assert(pid_is_valid(pid
));
2863 /* First let's drop the unit in case it's keyed as "pid". */
2864 (void) hashmap_remove_value(u
->manager
->watch_pids
, PID_TO_PTR(pid
), u
);
2866 /* Then, let's also drop the unit, in case it's in the array keyed by -pid */
2867 array
= hashmap_get(u
->manager
->watch_pids
, PID_TO_PTR(-pid
));
2869 /* Let's iterate through the array, dropping our own entry */
2872 for (size_t n
= 0; array
[n
]; n
++)
2874 array
[m
++] = array
[n
];
2878 /* The array is now empty, remove the entire entry */
2879 assert_se(hashmap_remove(u
->manager
->watch_pids
, PID_TO_PTR(-pid
)) == array
);
2884 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2887 void unit_unwatch_all_pids(Unit
*u
) {
2890 while (!set_isempty(u
->pids
))
2891 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2893 u
->pids
= set_free(u
->pids
);
2896 static void unit_tidy_watch_pids(Unit
*u
) {
2897 pid_t except1
, except2
;
2902 /* Cleans dead PIDs from our list */
2904 except1
= unit_main_pid(u
);
2905 except2
= unit_control_pid(u
);
2907 SET_FOREACH(e
, u
->pids
) {
2908 pid_t pid
= PTR_TO_PID(e
);
2910 if (pid
== except1
|| pid
== except2
)
2913 if (!pid_is_unwaited(pid
))
2914 unit_unwatch_pid(u
, pid
);
2918 static int on_rewatch_pids_event(sd_event_source
*s
, void *userdata
) {
2924 unit_tidy_watch_pids(u
);
2925 unit_watch_all_pids(u
);
2927 /* If the PID set is empty now, then let's finish this off. */
2928 unit_synthesize_cgroup_empty_event(u
);
2933 int unit_enqueue_rewatch_pids(Unit
*u
) {
2938 if (!u
->cgroup_path
)
2941 r
= cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
);
2944 if (r
> 0) /* On unified we can use proper notifications */
2947 /* Enqueues a low-priority job that will clean up dead PIDs from our list of PIDs to watch and subscribe to new
2948 * PIDs that might have appeared. We do this in a delayed job because the work might be quite slow, as it
2949 * involves issuing kill(pid, 0) on all processes we watch. */
2951 if (!u
->rewatch_pids_event_source
) {
2952 _cleanup_(sd_event_source_unrefp
) sd_event_source
*s
= NULL
;
2954 r
= sd_event_add_defer(u
->manager
->event
, &s
, on_rewatch_pids_event
, u
);
2956 return log_error_errno(r
, "Failed to allocate event source for tidying watched PIDs: %m");
2958 r
= sd_event_source_set_priority(s
, SD_EVENT_PRIORITY_IDLE
);
2960 return log_error_errno(r
, "Failed to adjust priority of event source for tidying watched PIDs: %m");
2962 (void) sd_event_source_set_description(s
, "tidy-watch-pids");
2964 u
->rewatch_pids_event_source
= TAKE_PTR(s
);
2967 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_ONESHOT
);
2969 return log_error_errno(r
, "Failed to enable event source for tidying watched PIDs: %m");
2974 void unit_dequeue_rewatch_pids(Unit
*u
) {
2978 if (!u
->rewatch_pids_event_source
)
2981 r
= sd_event_source_set_enabled(u
->rewatch_pids_event_source
, SD_EVENT_OFF
);
2983 log_warning_errno(r
, "Failed to disable event source for tidying watched PIDs, ignoring: %m");
2985 u
->rewatch_pids_event_source
= sd_event_source_disable_unref(u
->rewatch_pids_event_source
);
2988 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2990 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2994 case JOB_VERIFY_ACTIVE
:
2997 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2998 * startable by us but may appear due to external events, and it thus makes sense to permit enqueuing
3003 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
3004 * external events), hence it makes no sense to permit enqueuing such a request either. */
3005 return !u
->perpetual
;
3008 case JOB_TRY_RESTART
:
3009 return unit_can_stop(u
) && unit_can_start(u
);
3012 case JOB_TRY_RELOAD
:
3013 return unit_can_reload(u
);
3015 case JOB_RELOAD_OR_START
:
3016 return unit_can_reload(u
) && unit_can_start(u
);
3019 assert_not_reached();
3023 int unit_add_dependency(
3028 UnitDependencyMask mask
) {
3030 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
3031 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
3032 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
3033 [UNIT_WANTS
] = UNIT_WANTED_BY
,
3034 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
3035 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
3036 [UNIT_UPHOLDS
] = UNIT_UPHELD_BY
,
3037 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
3038 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
3039 [UNIT_WANTED_BY
] = UNIT_WANTS
,
3040 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
3041 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
3042 [UNIT_UPHELD_BY
] = UNIT_UPHOLDS
,
3043 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
3044 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
3045 [UNIT_BEFORE
] = UNIT_AFTER
,
3046 [UNIT_AFTER
] = UNIT_BEFORE
,
3047 [UNIT_ON_SUCCESS
] = UNIT_ON_SUCCESS_OF
,
3048 [UNIT_ON_SUCCESS_OF
] = UNIT_ON_SUCCESS
,
3049 [UNIT_ON_FAILURE
] = UNIT_ON_FAILURE_OF
,
3050 [UNIT_ON_FAILURE_OF
] = UNIT_ON_FAILURE
,
3051 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
3052 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
3053 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
3054 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
3055 [UNIT_PROPAGATES_STOP_TO
] = UNIT_STOP_PROPAGATED_FROM
,
3056 [UNIT_STOP_PROPAGATED_FROM
] = UNIT_PROPAGATES_STOP_TO
,
3057 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
, /* symmetric! 👓 */
3058 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
3059 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
3060 [UNIT_IN_SLICE
] = UNIT_SLICE_OF
,
3061 [UNIT_SLICE_OF
] = UNIT_IN_SLICE
,
3063 Unit
*original_u
= u
, *original_other
= other
;
3064 UnitDependencyAtom a
;
3067 /* Helper to know whether sending a notification is necessary or not: if the dependency is already
3068 * there, no need to notify! */
3069 bool notify
, notify_other
= false;
3072 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
3075 u
= unit_follow_merge(u
);
3076 other
= unit_follow_merge(other
);
3077 a
= unit_dependency_to_atom(d
);
3080 /* We won't allow dependencies on ourselves. We will not consider them an error however. */
3082 unit_maybe_warn_about_dependency(original_u
, original_other
->id
, d
);
3086 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3089 /* Note that ordering a device unit after a unit is permitted since it allows to start its job
3090 * running timeout at a specific time. */
3091 if (FLAGS_SET(a
, UNIT_ATOM_BEFORE
) && other
->type
== UNIT_DEVICE
) {
3092 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
3096 if (FLAGS_SET(a
, UNIT_ATOM_ON_FAILURE
) && !UNIT_VTABLE(u
)->can_fail
) {
3097 log_unit_warning(u
, "Requested dependency OnFailure=%s ignored (%s units cannot fail).", other
->id
, unit_type_to_string(u
->type
));
3101 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERS
) && !UNIT_VTABLE(u
)->can_trigger
)
3102 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3103 "Requested dependency Triggers=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(u
->type
));
3104 if (FLAGS_SET(a
, UNIT_ATOM_TRIGGERED_BY
) && !UNIT_VTABLE(other
)->can_trigger
)
3105 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3106 "Requested dependency TriggeredBy=%s refused (%s units cannot trigger other units).", other
->id
, unit_type_to_string(other
->type
));
3108 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && other
->type
!= UNIT_SLICE
)
3109 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3110 "Requested dependency Slice=%s refused (%s is not a slice unit).", other
->id
, other
->id
);
3111 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && u
->type
!= UNIT_SLICE
)
3112 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3113 "Requested dependency SliceOf=%s refused (%s is not a slice unit).", other
->id
, u
->id
);
3115 if (FLAGS_SET(a
, UNIT_ATOM_IN_SLICE
) && !UNIT_HAS_CGROUP_CONTEXT(u
))
3116 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3117 "Requested dependency Slice=%s refused (%s is not a cgroup unit).", other
->id
, u
->id
);
3119 if (FLAGS_SET(a
, UNIT_ATOM_SLICE_OF
) && !UNIT_HAS_CGROUP_CONTEXT(other
))
3120 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(EINVAL
),
3121 "Requested dependency SliceOf=%s refused (%s is not a cgroup unit).", other
->id
, other
->id
);
3123 r
= unit_add_dependency_hashmap(&u
->dependencies
, d
, other
, mask
, 0);
3128 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
3129 r
= unit_add_dependency_hashmap(&other
->dependencies
, inverse_table
[d
], u
, 0, mask
);
3132 notify_other
= r
> 0;
3135 if (add_reference
) {
3136 r
= unit_add_dependency_hashmap(&u
->dependencies
, UNIT_REFERENCES
, other
, mask
, 0);
3139 notify
= notify
|| r
> 0;
3141 r
= unit_add_dependency_hashmap(&other
->dependencies
, UNIT_REFERENCED_BY
, u
, 0, mask
);
3144 notify_other
= notify_other
|| r
> 0;
3148 unit_add_to_dbus_queue(u
);
3150 unit_add_to_dbus_queue(other
);
3152 return notify
|| notify_other
;
3155 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
, UnitDependencyMask mask
) {
3160 r
= unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3164 s
= unit_add_dependency(u
, e
, other
, add_reference
, mask
);
3168 return r
> 0 || s
> 0;
3171 static int resolve_template(Unit
*u
, const char *name
, char **buf
, const char **ret
) {
3179 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
3186 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
3188 _cleanup_free_
char *i
= NULL
;
3190 r
= unit_name_to_prefix(u
->id
, &i
);
3194 r
= unit_name_replace_instance(name
, i
, buf
);
3203 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3204 _cleanup_free_
char *buf
= NULL
;
3211 r
= resolve_template(u
, name
, &buf
, &name
);
3215 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3218 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3222 return unit_add_dependency(u
, d
, other
, add_reference
, mask
);
3225 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, bool add_reference
, UnitDependencyMask mask
) {
3226 _cleanup_free_
char *buf
= NULL
;
3233 r
= resolve_template(u
, name
, &buf
, &name
);
3237 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3240 r
= manager_load_unit(u
->manager
, name
, NULL
, NULL
, &other
);
3244 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
, mask
);
3247 int set_unit_path(const char *p
) {
3248 /* This is mostly for debug purposes */
3249 return RET_NERRNO(setenv("SYSTEMD_UNIT_PATH", p
, 1));
3252 char *unit_dbus_path(Unit
*u
) {
3258 return unit_dbus_path_from_name(u
->id
);
3261 char *unit_dbus_path_invocation_id(Unit
*u
) {
3264 if (sd_id128_is_null(u
->invocation_id
))
3267 return unit_dbus_path_from_name(u
->invocation_id_string
);
3270 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
3275 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
3277 if (sd_id128_equal(u
->invocation_id
, id
))
3280 if (!sd_id128_is_null(u
->invocation_id
))
3281 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3283 if (sd_id128_is_null(id
)) {
3288 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
3292 u
->invocation_id
= id
;
3293 sd_id128_to_string(id
, u
->invocation_id_string
);
3295 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
3302 u
->invocation_id
= SD_ID128_NULL
;
3303 u
->invocation_id_string
[0] = 0;
3307 int unit_set_slice(Unit
*u
, Unit
*slice
) {
3313 /* Sets the unit slice if it has not been set before. Is extra careful, to only allow this for units
3314 * that actually have a cgroup context. Also, we don't allow to set this for slices (since the parent
3315 * slice is derived from the name). Make sure the unit we set is actually a slice. */
3317 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
3320 if (u
->type
== UNIT_SLICE
)
3323 if (unit_active_state(u
) != UNIT_INACTIVE
)
3326 if (slice
->type
!= UNIT_SLICE
)
3329 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
3330 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
3333 if (UNIT_GET_SLICE(u
) == slice
)
3336 /* Disallow slice changes if @u is already bound to cgroups */
3337 if (UNIT_GET_SLICE(u
) && u
->cgroup_realized
)
3340 /* Remove any slices assigned prior; we should only have one UNIT_IN_SLICE dependency */
3341 if (UNIT_GET_SLICE(u
))
3342 unit_remove_dependencies(u
, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3344 r
= unit_add_dependency(u
, UNIT_IN_SLICE
, slice
, true, UNIT_DEPENDENCY_SLICE_PROPERTY
);
3351 int unit_set_default_slice(Unit
*u
) {
3352 const char *slice_name
;
3358 if (u
->manager
&& FLAGS_SET(u
->manager
->test_run_flags
, MANAGER_TEST_RUN_IGNORE_DEPENDENCIES
))
3361 if (UNIT_GET_SLICE(u
))
3365 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
3367 /* Implicitly place all instantiated units in their
3368 * own per-template slice */
3370 r
= unit_name_to_prefix(u
->id
, &prefix
);
3374 /* The prefix is already escaped, but it might include
3375 * "-" which has a special meaning for slice units,
3376 * hence escape it here extra. */
3377 escaped
= unit_name_escape(prefix
);
3381 if (MANAGER_IS_SYSTEM(u
->manager
))
3382 slice_name
= strjoina("system-", escaped
, ".slice");
3384 slice_name
= strjoina("app-", escaped
, ".slice");
3386 } else if (unit_is_extrinsic(u
))
3387 /* Keep all extrinsic units (e.g. perpetual units and swap and mount units in user mode) in
3388 * the root slice. They don't really belong in one of the subslices. */
3389 slice_name
= SPECIAL_ROOT_SLICE
;
3391 else if (MANAGER_IS_SYSTEM(u
->manager
))
3392 slice_name
= SPECIAL_SYSTEM_SLICE
;
3394 slice_name
= SPECIAL_APP_SLICE
;
3396 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
3400 return unit_set_slice(u
, slice
);
3403 const char *unit_slice_name(Unit
*u
) {
3407 slice
= UNIT_GET_SLICE(u
);
3414 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
3415 _cleanup_free_
char *t
= NULL
;
3422 r
= unit_name_change_suffix(u
->id
, type
, &t
);
3425 if (unit_has_name(u
, t
))
3428 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
3429 assert(r
< 0 || *_found
!= u
);
3433 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3434 const char *new_owner
;
3441 r
= sd_bus_message_read(message
, "sss", NULL
, NULL
, &new_owner
);
3443 bus_log_parse_error(r
);
3447 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3448 UNIT_VTABLE(u
)->bus_name_owner_change(u
, empty_to_null(new_owner
));
3453 static int get_name_owner_handler(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
3454 const sd_bus_error
*e
;
3455 const char *new_owner
;
3462 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3464 e
= sd_bus_message_get_error(message
);
3466 if (!sd_bus_error_has_name(e
, "org.freedesktop.DBus.Error.NameHasNoOwner")) {
3467 r
= sd_bus_error_get_errno(e
);
3468 log_unit_error_errno(u
, r
,
3469 "Unexpected error response from GetNameOwner(): %s",
3470 bus_error_message(e
, r
));
3475 r
= sd_bus_message_read(message
, "s", &new_owner
);
3477 return bus_log_parse_error(r
);
3479 assert(!isempty(new_owner
));
3482 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
3483 UNIT_VTABLE(u
)->bus_name_owner_change(u
, new_owner
);
3488 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
3496 if (u
->match_bus_slot
|| u
->get_name_owner_slot
)
3499 match
= strjoina("type='signal',"
3500 "sender='org.freedesktop.DBus',"
3501 "path='/org/freedesktop/DBus',"
3502 "interface='org.freedesktop.DBus',"
3503 "member='NameOwnerChanged',"
3504 "arg0='", name
, "'");
3506 r
= sd_bus_add_match_async(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, NULL
, u
);
3510 r
= sd_bus_call_method_async(
3512 &u
->get_name_owner_slot
,
3513 "org.freedesktop.DBus",
3514 "/org/freedesktop/DBus",
3515 "org.freedesktop.DBus",
3517 get_name_owner_handler
,
3521 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3525 log_unit_debug(u
, "Watching D-Bus name '%s'.", name
);
3529 int unit_watch_bus_name(Unit
*u
, const char *name
) {
3535 /* Watch a specific name on the bus. We only support one unit
3536 * watching each name for now. */
3538 if (u
->manager
->api_bus
) {
3539 /* If the bus is already available, install the match directly.
3540 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
3541 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
3543 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
3546 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
3548 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3549 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3550 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
3556 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
3560 (void) hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
3561 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
3562 u
->get_name_owner_slot
= sd_bus_slot_unref(u
->get_name_owner_slot
);
3565 int unit_add_node_dependency(Unit
*u
, const char *what
, UnitDependency dep
, UnitDependencyMask mask
) {
3566 _cleanup_free_
char *e
= NULL
;
3572 /* Adds in links to the device node that this unit is based on */
3576 if (!is_device_path(what
))
3579 /* When device units aren't supported (such as in a container), don't create dependencies on them. */
3580 if (!unit_type_supported(UNIT_DEVICE
))
3583 r
= unit_name_from_path(what
, ".device", &e
);
3587 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3591 if (dep
== UNIT_REQUIRES
&& device_shall_be_bound_by(device
, u
))
3592 dep
= UNIT_BINDS_TO
;
3594 return unit_add_two_dependencies(u
, UNIT_AFTER
,
3595 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3596 device
, true, mask
);
3599 int unit_add_blockdev_dependency(Unit
*u
, const char *what
, UnitDependencyMask mask
) {
3600 _cleanup_free_
char *escaped
= NULL
, *target
= NULL
;
3608 if (!path_startswith(what
, "/dev/"))
3611 /* If we don't support devices, then also don't bother with blockdev@.target */
3612 if (!unit_type_supported(UNIT_DEVICE
))
3615 r
= unit_name_path_escape(what
, &escaped
);
3619 r
= unit_name_build("blockdev", escaped
, ".target", &target
);
3623 return unit_add_dependency_by_name(u
, UNIT_AFTER
, target
, true, mask
);
3626 int unit_coldplug(Unit
*u
) {
3631 /* Make sure we don't enter a loop, when coldplugging recursively. */
3635 u
->coldplugged
= true;
3637 STRV_FOREACH(i
, u
->deserialized_refs
) {
3638 q
= bus_unit_track_add_name(u
, *i
);
3639 if (q
< 0 && r
>= 0)
3642 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3644 if (UNIT_VTABLE(u
)->coldplug
) {
3645 q
= UNIT_VTABLE(u
)->coldplug(u
);
3646 if (q
< 0 && r
>= 0)
3651 q
= job_coldplug(u
->job
);
3652 if (q
< 0 && r
>= 0)
3656 q
= job_coldplug(u
->nop_job
);
3657 if (q
< 0 && r
>= 0)
3664 void unit_catchup(Unit
*u
) {
3667 if (UNIT_VTABLE(u
)->catchup
)
3668 UNIT_VTABLE(u
)->catchup(u
);
3670 unit_cgroup_catchup(u
);
3673 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3679 /* If the source is some virtual kernel file system, then we assume we watch it anyway, and hence pretend we
3680 * are never out-of-date. */
3681 if (PATH_STARTSWITH_SET(path
, "/proc", "/sys"))
3684 if (stat(path
, &st
) < 0)
3685 /* What, cannot access this anymore? */
3689 /* For masked files check if they are still so */
3690 return !null_or_empty(&st
);
3692 /* For non-empty files check the mtime */
3693 return timespec_load(&st
.st_mtim
) > mtime
;
3698 bool unit_need_daemon_reload(Unit
*u
) {
3699 _cleanup_strv_free_
char **t
= NULL
;
3703 /* For unit files, we allow masking… */
3704 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3705 u
->load_state
== UNIT_MASKED
))
3708 /* Source paths should not be masked… */
3709 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3712 if (u
->load_state
== UNIT_LOADED
)
3713 (void) unit_find_dropin_paths(u
, &t
);
3714 if (!strv_equal(u
->dropin_paths
, t
))
3717 /* … any drop-ins that are masked are simply omitted from the list. */
3718 STRV_FOREACH(path
, u
->dropin_paths
)
3719 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3725 void unit_reset_failed(Unit
*u
) {
3728 if (UNIT_VTABLE(u
)->reset_failed
)
3729 UNIT_VTABLE(u
)->reset_failed(u
);
3731 ratelimit_reset(&u
->start_ratelimit
);
3732 u
->start_limit_hit
= false;
3735 Unit
*unit_following(Unit
*u
) {
3738 if (UNIT_VTABLE(u
)->following
)
3739 return UNIT_VTABLE(u
)->following(u
);
3744 bool unit_stop_pending(Unit
*u
) {
3747 /* This call does check the current state of the unit. It's
3748 * hence useful to be called from state change calls of the
3749 * unit itself, where the state isn't updated yet. This is
3750 * different from unit_inactive_or_pending() which checks both
3751 * the current state and for a queued job. */
3753 return unit_has_job_type(u
, JOB_STOP
);
3756 bool unit_inactive_or_pending(Unit
*u
) {
3759 /* Returns true if the unit is inactive or going down */
3761 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3764 if (unit_stop_pending(u
))
3770 bool unit_active_or_pending(Unit
*u
) {
3773 /* Returns true if the unit is active or going up */
3775 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3779 IN_SET(u
->job
->type
, JOB_START
, JOB_RELOAD_OR_START
, JOB_RESTART
))
3785 bool unit_will_restart_default(Unit
*u
) {
3788 return unit_has_job_type(u
, JOB_START
);
3791 bool unit_will_restart(Unit
*u
) {
3794 if (!UNIT_VTABLE(u
)->will_restart
)
3797 return UNIT_VTABLE(u
)->will_restart(u
);
3800 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3802 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3803 assert(SIGNAL_VALID(signo
));
3805 if (!UNIT_VTABLE(u
)->kill
)
3808 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3811 void unit_notify_cgroup_oom(Unit
*u
, bool managed_oom
) {
3814 if (UNIT_VTABLE(u
)->notify_cgroup_oom
)
3815 UNIT_VTABLE(u
)->notify_cgroup_oom(u
, managed_oom
);
3818 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3819 _cleanup_set_free_ Set
*pid_set
= NULL
;
3822 pid_set
= set_new(NULL
);
3826 /* Exclude the main/control pids from being killed via the cgroup */
3828 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3833 if (control_pid
> 0) {
3834 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3839 return TAKE_PTR(pid_set
);
3842 static int kill_common_log(pid_t pid
, int signo
, void *userdata
) {
3843 _cleanup_free_
char *comm
= NULL
;
3848 (void) get_process_comm(pid
, &comm
);
3849 log_unit_info(u
, "Sending signal SIG%s to process " PID_FMT
" (%s) on client request.",
3850 signal_to_string(signo
), pid
, strna(comm
));
3855 int unit_kill_common(
3861 sd_bus_error
*error
) {
3864 bool killed
= false;
3866 /* This is the common implementation for explicit user-requested killing of unit processes, shared by
3867 * various unit types. Do not confuse with unit_kill_context(), which is what we use when we want to
3868 * stop a service ourselves. */
3870 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3872 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3874 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3877 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3878 if (control_pid
< 0)
3879 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3880 if (control_pid
== 0)
3881 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3884 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3885 if (control_pid
> 0) {
3886 _cleanup_free_
char *comm
= NULL
;
3887 (void) get_process_comm(control_pid
, &comm
);
3889 if (kill(control_pid
, signo
) < 0) {
3890 /* Report this failure both to the logs and to the client */
3891 sd_bus_error_set_errnof(
3893 "Failed to send signal SIG%s to control process " PID_FMT
" (%s): %m",
3894 signal_to_string(signo
), control_pid
, strna(comm
));
3895 r
= log_unit_warning_errno(
3897 "Failed to send signal SIG%s to control process " PID_FMT
" (%s) on client request: %m",
3898 signal_to_string(signo
), control_pid
, strna(comm
));
3900 log_unit_info(u
, "Sent signal SIG%s to control process " PID_FMT
" (%s) on client request.",
3901 signal_to_string(signo
), control_pid
, strna(comm
));
3906 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3908 _cleanup_free_
char *comm
= NULL
;
3909 (void) get_process_comm(main_pid
, &comm
);
3911 if (kill(main_pid
, signo
) < 0) {
3913 sd_bus_error_set_errnof(
3915 "Failed to send signal SIG%s to main process " PID_FMT
" (%s): %m",
3916 signal_to_string(signo
), main_pid
, strna(comm
));
3918 r
= log_unit_warning_errno(
3920 "Failed to send signal SIG%s to main process " PID_FMT
" (%s) on client request: %m",
3921 signal_to_string(signo
), main_pid
, strna(comm
));
3923 log_unit_info(u
, "Sent signal SIG%s to main process " PID_FMT
" (%s) on client request.",
3924 signal_to_string(signo
), main_pid
, strna(comm
));
3929 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3930 _cleanup_set_free_ Set
*pid_set
= NULL
;
3933 /* Exclude the main/control pids from being killed via the cgroup */
3934 pid_set
= unit_pid_set(main_pid
, control_pid
);
3938 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, kill_common_log
, u
);
3940 if (!IN_SET(q
, -ESRCH
, -ENOENT
)) {
3942 sd_bus_error_set_errnof(
3944 "Failed to send signal SIG%s to auxiliary processes: %m",
3945 signal_to_string(signo
));
3947 r
= log_unit_warning_errno(
3949 "Failed to send signal SIG%s to auxiliary processes on client request: %m",
3950 signal_to_string(signo
));
3956 /* If the "fail" versions of the operation are requested, then complain if the set of processes we killed is empty */
3957 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
, KILL_MAIN_FAIL
))
3958 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No matching processes to kill");
3963 int unit_following_set(Unit
*u
, Set
**s
) {
3967 if (UNIT_VTABLE(u
)->following_set
)
3968 return UNIT_VTABLE(u
)->following_set(u
, s
);
3974 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3979 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3980 r
= unit_file_get_state(
3981 u
->manager
->unit_file_scope
,
3984 &u
->unit_file_state
);
3986 u
->unit_file_state
= UNIT_FILE_BAD
;
3989 return u
->unit_file_state
;
3992 int unit_get_unit_file_preset(Unit
*u
) {
3995 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3996 u
->unit_file_preset
= unit_file_query_preset(
3997 u
->manager
->unit_file_scope
,
3999 basename(u
->fragment_path
),
4002 return u
->unit_file_preset
;
4005 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*source
, Unit
*target
) {
4011 unit_ref_unset(ref
);
4013 ref
->source
= source
;
4014 ref
->target
= target
;
4015 LIST_PREPEND(refs_by_target
, target
->refs_by_target
, ref
);
4019 void unit_ref_unset(UnitRef
*ref
) {
4025 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
4026 * be unreferenced now. */
4027 unit_add_to_gc_queue(ref
->target
);
4029 LIST_REMOVE(refs_by_target
, ref
->target
->refs_by_target
, ref
);
4030 ref
->source
= ref
->target
= NULL
;
4033 static int user_from_unit_name(Unit
*u
, char **ret
) {
4035 static const uint8_t hash_key
[] = {
4036 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
4037 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
4040 _cleanup_free_
char *n
= NULL
;
4043 r
= unit_name_to_prefix(u
->id
, &n
);
4047 if (valid_user_group_name(n
, 0)) {
4052 /* If we can't use the unit name as a user name, then let's hash it and use that */
4053 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
4059 int unit_patch_contexts(Unit
*u
) {
4066 /* Patch in the manager defaults into the exec and cgroup
4067 * contexts, _after_ the rest of the settings have been
4070 ec
= unit_get_exec_context(u
);
4072 /* This only copies in the ones that need memory */
4073 for (unsigned i
= 0; i
< _RLIMIT_MAX
; i
++)
4074 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
4075 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
4080 if (MANAGER_IS_USER(u
->manager
) &&
4081 !ec
->working_directory
) {
4083 r
= get_home_dir(&ec
->working_directory
);
4087 /* Allow user services to run, even if the
4088 * home directory is missing */
4089 ec
->working_directory_missing_ok
= true;
4092 if (ec
->private_devices
)
4093 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
4095 if (ec
->protect_kernel_modules
)
4096 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
4098 if (ec
->protect_kernel_logs
)
4099 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYSLOG
);
4101 if (ec
->protect_clock
)
4102 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_SYS_TIME
) | (UINT64_C(1) << CAP_WAKE_ALARM
));
4104 if (ec
->dynamic_user
) {
4106 r
= user_from_unit_name(u
, &ec
->user
);
4112 ec
->group
= strdup(ec
->user
);
4117 /* If the dynamic user option is on, let's make sure that the unit can't leave its
4118 * UID/GID around in the file system or on IPC objects. Hence enforce a strict
4121 ec
->private_tmp
= true;
4122 ec
->remove_ipc
= true;
4123 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
4124 if (ec
->protect_home
== PROTECT_HOME_NO
)
4125 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
4127 /* Make sure this service can neither benefit from SUID/SGID binaries nor create
4129 ec
->no_new_privileges
= true;
4130 ec
->restrict_suid_sgid
= true;
4134 cc
= unit_get_cgroup_context(u
);
4137 if (ec
->private_devices
&&
4138 cc
->device_policy
== CGROUP_DEVICE_POLICY_AUTO
)
4139 cc
->device_policy
= CGROUP_DEVICE_POLICY_CLOSED
;
4141 if ((ec
->root_image
|| !LIST_IS_EMPTY(ec
->mount_images
)) &&
4142 (cc
->device_policy
!= CGROUP_DEVICE_POLICY_AUTO
|| cc
->device_allow
)) {
4144 /* When RootImage= or MountImages= is specified, the following devices are touched. */
4145 FOREACH_STRING(p
, "/dev/loop-control", "/dev/mapper/control") {
4146 r
= cgroup_add_device_allow(cc
, p
, "rw");
4150 FOREACH_STRING(p
, "block-loop", "block-blkext", "block-device-mapper") {
4151 r
= cgroup_add_device_allow(cc
, p
, "rwm");
4156 /* Make sure "block-loop" can be resolved, i.e. make sure "loop" shows up in /proc/devices.
4157 * Same for mapper and verity. */
4158 FOREACH_STRING(p
, "modprobe@loop.service", "modprobe@dm_mod.service", "modprobe@dm_verity.service") {
4159 r
= unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_WANTS
, p
, true, UNIT_DEPENDENCY_FILE
);
4165 if (ec
->protect_clock
) {
4166 r
= cgroup_add_device_allow(cc
, "char-rtc", "r");
4175 ExecContext
*unit_get_exec_context(const Unit
*u
) {
4182 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
4186 return (ExecContext
*) ((uint8_t*) u
+ offset
);
4189 KillContext
*unit_get_kill_context(Unit
*u
) {
4196 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
4200 return (KillContext
*) ((uint8_t*) u
+ offset
);
4203 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
4209 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
4213 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
4216 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
4222 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4226 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
4229 static const char* unit_drop_in_dir(Unit
*u
, UnitWriteFlags flags
) {
4232 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4235 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
4236 return u
->manager
->lookup_paths
.transient
;
4238 if (flags
& UNIT_PERSISTENT
)
4239 return u
->manager
->lookup_paths
.persistent_control
;
4241 if (flags
& UNIT_RUNTIME
)
4242 return u
->manager
->lookup_paths
.runtime_control
;
4247 char* unit_escape_setting(const char *s
, UnitWriteFlags flags
, char **buf
) {
4253 /* Escapes the input string as requested. Returns the escaped string. If 'buf' is specified then the allocated
4254 * return buffer pointer is also written to *buf, except if no escaping was necessary, in which case *buf is
4255 * set to NULL, and the input pointer is returned as-is. This means the return value always contains a properly
4256 * escaped version, but *buf when passed only contains a pointer if an allocation was necessary. If *buf is
4257 * not specified, then the return value always needs to be freed. Callers can use this to optimize memory
4260 if (flags
& UNIT_ESCAPE_SPECIFIERS
) {
4261 ret
= specifier_escape(s
);
4268 if (flags
& UNIT_ESCAPE_C
) {
4281 return ret
?: (char*) s
;
4284 return ret
?: strdup(s
);
4287 char* unit_concat_strv(char **l
, UnitWriteFlags flags
) {
4288 _cleanup_free_
char *result
= NULL
;
4291 /* Takes a list of strings, escapes them, and concatenates them. This may be used to format command lines in a
4292 * way suitable for ExecStart= stanzas */
4294 STRV_FOREACH(i
, l
) {
4295 _cleanup_free_
char *buf
= NULL
;
4300 p
= unit_escape_setting(*i
, flags
, &buf
);
4304 a
= (n
> 0) + 1 + strlen(p
) + 1; /* separating space + " + entry + " */
4305 if (!GREEDY_REALLOC(result
, n
+ a
+ 1))
4319 if (!GREEDY_REALLOC(result
, n
+ 1))
4324 return TAKE_PTR(result
);
4327 int unit_write_setting(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *data
) {
4328 _cleanup_free_
char *p
= NULL
, *q
= NULL
, *escaped
= NULL
;
4329 const char *dir
, *wrapped
;
4336 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4339 data
= unit_escape_setting(data
, flags
, &escaped
);
4343 /* Prefix the section header. If we are writing this out as transient file, then let's suppress this if the
4344 * previous section header is the same */
4346 if (flags
& UNIT_PRIVATE
) {
4347 if (!UNIT_VTABLE(u
)->private_section
)
4350 if (!u
->transient_file
|| u
->last_section_private
< 0)
4351 data
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4352 else if (u
->last_section_private
== 0)
4353 data
= strjoina("\n[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
4355 if (!u
->transient_file
|| u
->last_section_private
< 0)
4356 data
= strjoina("[Unit]\n", data
);
4357 else if (u
->last_section_private
> 0)
4358 data
= strjoina("\n[Unit]\n", data
);
4361 if (u
->transient_file
) {
4362 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
4363 * write to the transient unit file. */
4364 fputs(data
, u
->transient_file
);
4366 if (!endswith(data
, "\n"))
4367 fputc('\n', u
->transient_file
);
4369 /* Remember which section we wrote this entry to */
4370 u
->last_section_private
= !!(flags
& UNIT_PRIVATE
);
4374 dir
= unit_drop_in_dir(u
, flags
);
4378 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
4379 "# or an equivalent operation. Do not edit.\n",
4383 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
4387 (void) mkdir_p_label(p
, 0755);
4389 /* Make sure the drop-in dir is registered in our path cache. This way we don't need to stupidly
4390 * recreate the cache after every drop-in we write. */
4391 if (u
->manager
->unit_path_cache
) {
4392 r
= set_put_strdup(&u
->manager
->unit_path_cache
, p
);
4397 r
= write_string_file_atomic_label(q
, wrapped
);
4401 r
= strv_push(&u
->dropin_paths
, q
);
4406 strv_uniq(u
->dropin_paths
);
4408 u
->dropin_mtime
= now(CLOCK_REALTIME
);
4413 int unit_write_settingf(Unit
*u
, UnitWriteFlags flags
, const char *name
, const char *format
, ...) {
4414 _cleanup_free_
char *p
= NULL
;
4422 if (UNIT_WRITE_FLAGS_NOOP(flags
))
4425 va_start(ap
, format
);
4426 r
= vasprintf(&p
, format
, ap
);
4432 return unit_write_setting(u
, flags
, name
, p
);
4435 int unit_make_transient(Unit
*u
) {
4436 _cleanup_free_
char *path
= NULL
;
4441 if (!UNIT_VTABLE(u
)->can_transient
)
4444 (void) mkdir_p_label(u
->manager
->lookup_paths
.transient
, 0755);
4446 path
= path_join(u
->manager
->lookup_paths
.transient
, u
->id
);
4450 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
4451 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
4453 RUN_WITH_UMASK(0022) {
4454 f
= fopen(path
, "we");
4459 safe_fclose(u
->transient_file
);
4460 u
->transient_file
= f
;
4462 free_and_replace(u
->fragment_path
, path
);
4464 u
->source_path
= mfree(u
->source_path
);
4465 u
->dropin_paths
= strv_free(u
->dropin_paths
);
4466 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
4468 u
->load_state
= UNIT_STUB
;
4470 u
->transient
= true;
4472 unit_add_to_dbus_queue(u
);
4473 unit_add_to_gc_queue(u
);
4475 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
4481 static int log_kill(pid_t pid
, int sig
, void *userdata
) {
4482 _cleanup_free_
char *comm
= NULL
;
4484 (void) get_process_comm(pid
, &comm
);
4486 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
4487 only, like for example systemd's own PAM stub process. */
4488 if (comm
&& comm
[0] == '(')
4491 log_unit_notice(userdata
,
4492 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
4495 signal_to_string(sig
));
4500 static int operation_to_signal(const KillContext
*c
, KillOperation k
, bool *noteworthy
) {
4505 case KILL_TERMINATE
:
4506 case KILL_TERMINATE_AND_LOG
:
4507 *noteworthy
= false;
4508 return c
->kill_signal
;
4511 *noteworthy
= false;
4512 return restart_kill_signal(c
);
4516 return c
->final_kill_signal
;
4520 return c
->watchdog_signal
;
4523 assert_not_reached();
4527 int unit_kill_context(
4533 bool main_pid_alien
) {
4535 bool wait_for_exit
= false, send_sighup
;
4536 cg_kill_log_func_t log_func
= NULL
;
4542 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0
4543 * if we killed something worth waiting for, 0 otherwise. Do not confuse with unit_kill_common()
4544 * which is used for user-requested killing of unit processes. */
4546 if (c
->kill_mode
== KILL_NONE
)
4550 sig
= operation_to_signal(c
, k
, ¬eworthy
);
4552 log_func
= log_kill
;
4556 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
4561 log_func(main_pid
, sig
, u
);
4563 r
= kill_and_sigcont(main_pid
, sig
);
4564 if (r
< 0 && r
!= -ESRCH
) {
4565 _cleanup_free_
char *comm
= NULL
;
4566 (void) get_process_comm(main_pid
, &comm
);
4568 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
4570 if (!main_pid_alien
)
4571 wait_for_exit
= true;
4573 if (r
!= -ESRCH
&& send_sighup
)
4574 (void) kill(main_pid
, SIGHUP
);
4578 if (control_pid
> 0) {
4580 log_func(control_pid
, sig
, u
);
4582 r
= kill_and_sigcont(control_pid
, sig
);
4583 if (r
< 0 && r
!= -ESRCH
) {
4584 _cleanup_free_
char *comm
= NULL
;
4585 (void) get_process_comm(control_pid
, &comm
);
4587 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
4589 wait_for_exit
= true;
4591 if (r
!= -ESRCH
&& send_sighup
)
4592 (void) kill(control_pid
, SIGHUP
);
4596 if (u
->cgroup_path
&&
4597 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
4598 _cleanup_set_free_ Set
*pid_set
= NULL
;
4600 /* Exclude the main/control pids from being killed via the cgroup */
4601 pid_set
= unit_pid_set(main_pid
, control_pid
);
4605 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4607 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
4611 if (!IN_SET(r
, -EAGAIN
, -ESRCH
, -ENOENT
))
4612 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", empty_to_root(u
->cgroup_path
));
4616 /* FIXME: For now, on the legacy hierarchy, we will not wait for the cgroup members to die if
4617 * we are running in a container or if this is a delegation unit, simply because cgroup
4618 * notification is unreliable in these cases. It doesn't work at all in containers, and outside
4619 * of containers it can be confused easily by left-over directories in the cgroup — which
4620 * however should not exist in non-delegated units. On the unified hierarchy that's different,
4621 * there we get proper events. Hence rely on them. */
4623 if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
4624 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
4625 wait_for_exit
= true;
4630 pid_set
= unit_pid_set(main_pid
, control_pid
);
4634 (void) cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
4643 return wait_for_exit
;
4646 int unit_require_mounts_for(Unit
*u
, const char *path
, UnitDependencyMask mask
) {
4652 /* Registers a unit for requiring a certain path and all its prefixes. We keep a hashtable of these
4653 * paths in the unit (from the path to the UnitDependencyInfo structure indicating how to the
4654 * dependency came to be). However, we build a prefix table for all possible prefixes so that new
4655 * appearing mount units can easily determine which units to make themselves a dependency of. */
4657 if (!path_is_absolute(path
))
4660 if (hashmap_contains(u
->requires_mounts_for
, path
)) /* Exit quickly if the path is already covered. */
4663 _cleanup_free_
char *p
= strdup(path
);
4667 /* Use the canonical form of the path as the stored key. We call path_is_normalized()
4668 * only after simplification, since path_is_normalized() rejects paths with '.'.
4669 * path_is_normalized() also verifies that the path fits in PATH_MAX. */
4670 path
= path_simplify(p
);
4672 if (!path_is_normalized(path
))
4675 UnitDependencyInfo di
= {
4679 r
= hashmap_ensure_put(&u
->requires_mounts_for
, &path_hash_ops
, p
, di
.data
);
4683 TAKE_PTR(p
); /* path remains a valid pointer to the string stored in the hashmap */
4685 char prefix
[strlen(path
) + 1];
4686 PATH_FOREACH_PREFIX_MORE(prefix
, path
) {
4689 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
4691 _cleanup_free_
char *q
= NULL
;
4693 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &path_hash_ops
);
4705 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
4721 int unit_setup_exec_runtime(Unit
*u
) {
4727 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
4730 /* Check if there already is an ExecRuntime for this unit? */
4731 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
4735 /* Try to get it from somebody else */
4736 UNIT_FOREACH_DEPENDENCY(other
, u
, UNIT_ATOM_JOINS_NAMESPACE_OF
) {
4737 r
= exec_runtime_acquire(u
->manager
, NULL
, other
->id
, false, rt
);
4742 return exec_runtime_acquire(u
->manager
, unit_get_exec_context(u
), u
->id
, true, rt
);
4745 int unit_setup_dynamic_creds(Unit
*u
) {
4747 DynamicCreds
*dcreds
;
4752 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
4754 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
4756 ec
= unit_get_exec_context(u
);
4759 if (!ec
->dynamic_user
)
4762 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
4765 bool unit_type_supported(UnitType t
) {
4766 if (_unlikely_(t
< 0))
4768 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
4771 if (!unit_vtable
[t
]->supported
)
4774 return unit_vtable
[t
]->supported();
4777 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4783 if (!unit_log_level_test(u
, LOG_NOTICE
))
4786 r
= dir_is_empty(where
, /* ignore_hidden_or_backup= */ false);
4787 if (r
> 0 || r
== -ENOTDIR
)
4790 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4794 log_unit_struct(u
, LOG_NOTICE
,
4795 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4796 LOG_UNIT_INVOCATION_ID(u
),
4797 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4801 int unit_fail_if_noncanonical(Unit
*u
, const char* where
) {
4802 _cleanup_free_
char *canonical_where
= NULL
;
4808 r
= chase_symlinks(where
, NULL
, CHASE_NONEXISTENT
, &canonical_where
, NULL
);
4810 log_unit_debug_errno(u
, r
, "Failed to check %s for symlinks, ignoring: %m", where
);
4814 /* We will happily ignore a trailing slash (or any redundant slashes) */
4815 if (path_equal(where
, canonical_where
))
4818 /* No need to mention "." or "..", they would already have been rejected by unit_name_from_path() */
4819 log_unit_struct(u
, LOG_ERR
,
4820 "MESSAGE_ID=" SD_MESSAGE_OVERMOUNTING_STR
,
4821 LOG_UNIT_INVOCATION_ID(u
),
4822 LOG_UNIT_MESSAGE(u
, "Mount path %s is not canonical (contains a symlink).", where
),
4828 bool unit_is_pristine(Unit
*u
) {
4831 /* Check if the unit already exists or is already around,
4832 * in a number of different ways. Note that to cater for unit
4833 * types such as slice, we are generally fine with units that
4834 * are marked UNIT_LOADED even though nothing was actually
4835 * loaded, as those unit types don't require a file on disk. */
4837 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4840 !strv_isempty(u
->dropin_paths
) ||
4845 pid_t
unit_control_pid(Unit
*u
) {
4848 if (UNIT_VTABLE(u
)->control_pid
)
4849 return UNIT_VTABLE(u
)->control_pid(u
);
4854 pid_t
unit_main_pid(Unit
*u
) {
4857 if (UNIT_VTABLE(u
)->main_pid
)
4858 return UNIT_VTABLE(u
)->main_pid(u
);
4863 static void unit_unref_uid_internal(
4867 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4871 assert(_manager_unref_uid
);
4873 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4874 * gid_t are actually the same time, with the same validity rules.
4876 * Drops a reference to UID/GID from a unit. */
4878 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4879 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4881 if (!uid_is_valid(*ref_uid
))
4884 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4885 *ref_uid
= UID_INVALID
;
4888 static void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4889 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4892 static void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4893 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4896 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4899 unit_unref_uid(u
, destroy_now
);
4900 unit_unref_gid(u
, destroy_now
);
4903 static int unit_ref_uid_internal(
4908 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4914 assert(uid_is_valid(uid
));
4915 assert(_manager_ref_uid
);
4917 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4918 * are actually the same type, and have the same validity rules.
4920 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4921 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4924 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4925 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4927 if (*ref_uid
== uid
)
4930 if (uid_is_valid(*ref_uid
)) /* Already set? */
4933 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4941 static int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4942 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4945 static int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4946 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4949 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4954 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4956 if (uid_is_valid(uid
)) {
4957 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4962 if (gid_is_valid(gid
)) {
4963 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4966 unit_unref_uid(u
, false);
4972 return r
> 0 || q
> 0;
4975 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4981 c
= unit_get_exec_context(u
);
4983 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4985 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4990 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4995 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4996 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4997 * objects when no service references the UID/GID anymore. */
4999 r
= unit_ref_uid_gid(u
, uid
, gid
);
5001 unit_add_to_dbus_queue(u
);
5004 int unit_acquire_invocation_id(Unit
*u
) {
5010 r
= sd_id128_randomize(&id
);
5012 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
5014 r
= unit_set_invocation_id(u
, id
);
5016 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");
5018 unit_add_to_dbus_queue(u
);
5022 int unit_set_exec_params(Unit
*u
, ExecParameters
*p
) {
5028 /* Copy parameters from manager */
5029 r
= manager_get_effective_environment(u
->manager
, &p
->environment
);
5033 p
->confirm_spawn
= manager_get_confirm_spawn(u
->manager
);
5034 p
->cgroup_supported
= u
->manager
->cgroup_supported
;
5035 p
->prefix
= u
->manager
->prefix
;
5036 SET_FLAG(p
->flags
, EXEC_PASS_LOG_UNIT
|EXEC_CHOWN_DIRECTORIES
, MANAGER_IS_SYSTEM(u
->manager
));
5038 /* Copy parameters from unit */
5039 p
->cgroup_path
= u
->cgroup_path
;
5040 SET_FLAG(p
->flags
, EXEC_CGROUP_DELEGATE
, unit_cgroup_delegate(u
));
5042 p
->received_credentials_directory
= u
->manager
->received_credentials_directory
;
5043 p
->received_encrypted_credentials_directory
= u
->manager
->received_encrypted_credentials_directory
;
5048 int unit_fork_helper_process(Unit
*u
, const char *name
, pid_t
*ret
) {
5054 /* Forks off a helper process and makes sure it is a member of the unit's cgroup. Returns == 0 in the child,
5055 * and > 0 in the parent. The pid parameter is always filled in with the child's PID. */
5057 (void) unit_realize_cgroup(u
);
5059 r
= safe_fork(name
, FORK_REOPEN_LOG
, ret
);
5063 (void) default_signals(SIGNALS_CRASH_HANDLER
, SIGNALS_IGNORE
);
5064 (void) ignore_signals(SIGPIPE
);
5066 (void) prctl(PR_SET_PDEATHSIG
, SIGTERM
);
5068 if (u
->cgroup_path
) {
5069 r
= cg_attach_everywhere(u
->manager
->cgroup_supported
, u
->cgroup_path
, 0, NULL
, NULL
);
5071 log_unit_error_errno(u
, r
, "Failed to join unit cgroup %s: %m", empty_to_root(u
->cgroup_path
));
5079 int unit_fork_and_watch_rm_rf(Unit
*u
, char **paths
, pid_t
*ret_pid
) {
5086 r
= unit_fork_helper_process(u
, "(sd-rmrf)", &pid
);
5090 int ret
= EXIT_SUCCESS
;
5092 STRV_FOREACH(i
, paths
) {
5093 r
= rm_rf(*i
, REMOVE_ROOT
|REMOVE_PHYSICAL
|REMOVE_MISSING_OK
);
5095 log_error_errno(r
, "Failed to remove '%s': %m", *i
);
5103 r
= unit_watch_pid(u
, pid
, true);
5111 static void unit_update_dependency_mask(Hashmap
*deps
, Unit
*other
, UnitDependencyInfo di
) {
5115 if (di
.origin_mask
== 0 && di
.destination_mask
== 0)
5116 /* No bit set anymore, let's drop the whole entry */
5117 assert_se(hashmap_remove(deps
, other
));
5119 /* Mask was reduced, let's update the entry */
5120 assert_se(hashmap_update(deps
, other
, di
.data
) == 0);
5123 void unit_remove_dependencies(Unit
*u
, UnitDependencyMask mask
) {
5127 /* Removes all dependencies u has on other units marked for ownership by 'mask'. */
5132 HASHMAP_FOREACH(deps
, u
->dependencies
) {
5136 UnitDependencyInfo di
;
5141 HASHMAP_FOREACH_KEY(di
.data
, other
, deps
) {
5142 Hashmap
*other_deps
;
5144 if (FLAGS_SET(~mask
, di
.origin_mask
))
5147 di
.origin_mask
&= ~mask
;
5148 unit_update_dependency_mask(deps
, other
, di
);
5150 /* We updated the dependency from our unit to the other unit now. But most
5151 * dependencies imply a reverse dependency. Hence, let's delete that one
5152 * too. For that we go through all dependency types on the other unit and
5153 * delete all those which point to us and have the right mask set. */
5155 HASHMAP_FOREACH(other_deps
, other
->dependencies
) {
5156 UnitDependencyInfo dj
;
5158 dj
.data
= hashmap_get(other_deps
, u
);
5159 if (FLAGS_SET(~mask
, dj
.destination_mask
))
5162 dj
.destination_mask
&= ~mask
;
5163 unit_update_dependency_mask(other_deps
, u
, dj
);
5166 unit_add_to_gc_queue(other
);
5176 static int unit_get_invocation_path(Unit
*u
, char **ret
) {
5183 if (MANAGER_IS_SYSTEM(u
->manager
))
5184 p
= strjoin("/run/systemd/units/invocation:", u
->id
);
5186 _cleanup_free_
char *user_path
= NULL
;
5187 r
= xdg_user_runtime_dir(&user_path
, "/systemd/units/invocation:");
5190 p
= strjoin(user_path
, u
->id
);
5200 static int unit_export_invocation_id(Unit
*u
) {
5201 _cleanup_free_
char *p
= NULL
;
5206 if (u
->exported_invocation_id
)
5209 if (sd_id128_is_null(u
->invocation_id
))
5212 r
= unit_get_invocation_path(u
, &p
);
5214 return log_unit_debug_errno(u
, r
, "Failed to get invocation path: %m");
5216 r
= symlink_atomic_label(u
->invocation_id_string
, p
);
5218 return log_unit_debug_errno(u
, r
, "Failed to create invocation ID symlink %s: %m", p
);
5220 u
->exported_invocation_id
= true;
5224 static int unit_export_log_level_max(Unit
*u
, const ExecContext
*c
) {
5232 if (u
->exported_log_level_max
)
5235 if (c
->log_level_max
< 0)
5238 assert(c
->log_level_max
<= 7);
5240 buf
[0] = '0' + c
->log_level_max
;
5243 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5244 r
= symlink_atomic(buf
, p
);
5246 return log_unit_debug_errno(u
, r
, "Failed to create maximum log level symlink %s: %m", p
);
5248 u
->exported_log_level_max
= true;
5252 static int unit_export_log_extra_fields(Unit
*u
, const ExecContext
*c
) {
5253 _cleanup_close_
int fd
= -1;
5254 struct iovec
*iovec
;
5261 if (u
->exported_log_extra_fields
)
5264 if (c
->n_log_extra_fields
<= 0)
5267 sizes
= newa(le64_t
, c
->n_log_extra_fields
);
5268 iovec
= newa(struct iovec
, c
->n_log_extra_fields
* 2);
5270 for (size_t i
= 0; i
< c
->n_log_extra_fields
; i
++) {
5271 sizes
[i
] = htole64(c
->log_extra_fields
[i
].iov_len
);
5273 iovec
[i
*2] = IOVEC_MAKE(sizes
+ i
, sizeof(le64_t
));
5274 iovec
[i
*2+1] = c
->log_extra_fields
[i
];
5277 p
= strjoina("/run/systemd/units/log-extra-fields:", u
->id
);
5278 pattern
= strjoina(p
, ".XXXXXX");
5280 fd
= mkostemp_safe(pattern
);
5282 return log_unit_debug_errno(u
, fd
, "Failed to create extra fields file %s: %m", p
);
5284 n
= writev(fd
, iovec
, c
->n_log_extra_fields
*2);
5286 r
= log_unit_debug_errno(u
, errno
, "Failed to write extra fields: %m");
5290 (void) fchmod(fd
, 0644);
5292 if (rename(pattern
, p
) < 0) {
5293 r
= log_unit_debug_errno(u
, errno
, "Failed to rename extra fields file: %m");
5297 u
->exported_log_extra_fields
= true;
5301 (void) unlink(pattern
);
5305 static int unit_export_log_ratelimit_interval(Unit
*u
, const ExecContext
*c
) {
5306 _cleanup_free_
char *buf
= NULL
;
5313 if (u
->exported_log_ratelimit_interval
)
5316 if (c
->log_ratelimit_interval_usec
== 0)
5319 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5321 if (asprintf(&buf
, "%" PRIu64
, c
->log_ratelimit_interval_usec
) < 0)
5324 r
= symlink_atomic(buf
, p
);
5326 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit interval symlink %s: %m", p
);
5328 u
->exported_log_ratelimit_interval
= true;
5332 static int unit_export_log_ratelimit_burst(Unit
*u
, const ExecContext
*c
) {
5333 _cleanup_free_
char *buf
= NULL
;
5340 if (u
->exported_log_ratelimit_burst
)
5343 if (c
->log_ratelimit_burst
== 0)
5346 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5348 if (asprintf(&buf
, "%u", c
->log_ratelimit_burst
) < 0)
5351 r
= symlink_atomic(buf
, p
);
5353 return log_unit_debug_errno(u
, r
, "Failed to create log rate limit burst symlink %s: %m", p
);
5355 u
->exported_log_ratelimit_burst
= true;
5359 void unit_export_state_files(Unit
*u
) {
5360 const ExecContext
*c
;
5367 if (MANAGER_IS_TEST_RUN(u
->manager
))
5370 /* Exports a couple of unit properties to /run/systemd/units/, so that journald can quickly query this data
5371 * from there. Ideally, journald would use IPC to query this, like everybody else, but that's hard, as long as
5372 * the IPC system itself and PID 1 also log to the journal.
5374 * Note that these files really shouldn't be considered API for anyone else, as use a runtime file system as
5375 * IPC replacement is not compatible with today's world of file system namespaces. However, this doesn't really
5376 * apply to communication between the journal and systemd, as we assume that these two daemons live in the same
5377 * namespace at least.
5379 * Note that some of the "files" exported here are actually symlinks and not regular files. Symlinks work
5380 * better for storing small bits of data, in particular as we can write them with two system calls, and read
5383 (void) unit_export_invocation_id(u
);
5385 if (!MANAGER_IS_SYSTEM(u
->manager
))
5388 c
= unit_get_exec_context(u
);
5390 (void) unit_export_log_level_max(u
, c
);
5391 (void) unit_export_log_extra_fields(u
, c
);
5392 (void) unit_export_log_ratelimit_interval(u
, c
);
5393 (void) unit_export_log_ratelimit_burst(u
, c
);
5397 void unit_unlink_state_files(Unit
*u
) {
5405 /* Undoes the effect of unit_export_state() */
5407 if (u
->exported_invocation_id
) {
5408 _cleanup_free_
char *invocation_path
= NULL
;
5409 int r
= unit_get_invocation_path(u
, &invocation_path
);
5411 (void) unlink(invocation_path
);
5412 u
->exported_invocation_id
= false;
5416 if (!MANAGER_IS_SYSTEM(u
->manager
))
5419 if (u
->exported_log_level_max
) {
5420 p
= strjoina("/run/systemd/units/log-level-max:", u
->id
);
5423 u
->exported_log_level_max
= false;
5426 if (u
->exported_log_extra_fields
) {
5427 p
= strjoina("/run/systemd/units/extra-fields:", u
->id
);
5430 u
->exported_log_extra_fields
= false;
5433 if (u
->exported_log_ratelimit_interval
) {
5434 p
= strjoina("/run/systemd/units/log-rate-limit-interval:", u
->id
);
5437 u
->exported_log_ratelimit_interval
= false;
5440 if (u
->exported_log_ratelimit_burst
) {
5441 p
= strjoina("/run/systemd/units/log-rate-limit-burst:", u
->id
);
5444 u
->exported_log_ratelimit_burst
= false;
5448 int unit_prepare_exec(Unit
*u
) {
5453 /* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
5454 * Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
5455 r
= bpf_firewall_load_custom(u
);
5459 /* Prepares everything so that we can fork of a process for this unit */
5461 (void) unit_realize_cgroup(u
);
5463 if (u
->reset_accounting
) {
5464 (void) unit_reset_accounting(u
);
5465 u
->reset_accounting
= false;
5468 unit_export_state_files(u
);
5470 r
= unit_setup_exec_runtime(u
);
5474 r
= unit_setup_dynamic_creds(u
);
5481 static bool ignore_leftover_process(const char *comm
) {
5482 return comm
&& comm
[0] == '('; /* Most likely our own helper process (PAM?), ignore */
5485 int unit_log_leftover_process_start(pid_t pid
, int sig
, void *userdata
) {
5486 _cleanup_free_
char *comm
= NULL
;
5488 (void) get_process_comm(pid
, &comm
);
5490 if (ignore_leftover_process(comm
))
5493 /* During start we print a warning */
5495 log_unit_warning(userdata
,
5496 "Found left-over process " PID_FMT
" (%s) in control group while starting unit. Ignoring.\n"
5497 "This usually indicates unclean termination of a previous run, or service implementation deficiencies.",
5503 int unit_log_leftover_process_stop(pid_t pid
, int sig
, void *userdata
) {
5504 _cleanup_free_
char *comm
= NULL
;
5506 (void) get_process_comm(pid
, &comm
);
5508 if (ignore_leftover_process(comm
))
5511 /* During stop we only print an informational message */
5513 log_unit_info(userdata
,
5514 "Unit process " PID_FMT
" (%s) remains running after unit stopped.",
5520 int unit_warn_leftover_processes(Unit
*u
, cg_kill_log_func_t log_func
) {
5523 (void) unit_pick_cgroup_path(u
);
5525 if (!u
->cgroup_path
)
5528 return cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, 0, 0, NULL
, log_func
, u
);
5531 bool unit_needs_console(Unit
*u
) {
5533 UnitActiveState state
;
5537 state
= unit_active_state(u
);
5539 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
5542 if (UNIT_VTABLE(u
)->needs_console
)
5543 return UNIT_VTABLE(u
)->needs_console(u
);
5545 /* If this unit type doesn't implement this call, let's use a generic fallback implementation: */
5546 ec
= unit_get_exec_context(u
);
5550 return exec_context_may_touch_console(ec
);
5553 const char *unit_label_path(const Unit
*u
) {
5558 /* Returns the file system path to use for MAC access decisions, i.e. the file to read the SELinux label off
5559 * when validating access checks. */
5561 if (IN_SET(u
->load_state
, UNIT_MASKED
, UNIT_NOT_FOUND
, UNIT_MERGED
))
5562 return NULL
; /* Shortcut things if we know there is no real, relevant unit file around */
5564 p
= u
->source_path
?: u
->fragment_path
;
5568 if (IN_SET(u
->load_state
, UNIT_LOADED
, UNIT_BAD_SETTING
, UNIT_ERROR
))
5569 return p
; /* Shortcut things, if we successfully loaded at least some stuff from the unit file */
5571 /* Not loaded yet, we need to go to disk */
5572 assert(u
->load_state
== UNIT_STUB
);
5574 /* If a unit is masked, then don't read the SELinux label of /dev/null, as that really makes no sense */
5575 if (null_or_empty_path(p
) > 0)
5581 int unit_pid_attachable(Unit
*u
, pid_t pid
, sd_bus_error
*error
) {
5586 /* Checks whether the specified PID is generally good for attaching, i.e. a valid PID, not our manager itself,
5587 * and not a kernel thread either */
5589 /* First, a simple range check */
5590 if (!pid_is_valid(pid
))
5591 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process identifier " PID_FMT
" is not valid.", pid
);
5593 /* Some extra safety check */
5594 if (pid
== 1 || pid
== getpid_cached())
5595 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a manager process, refusing.", pid
);
5597 /* Don't even begin to bother with kernel threads */
5598 r
= is_kernel_thread(pid
);
5600 return sd_bus_error_setf(error
, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN
, "Process with ID " PID_FMT
" does not exist.", pid
);
5602 return sd_bus_error_set_errnof(error
, r
, "Failed to determine whether process " PID_FMT
" is a kernel thread: %m", pid
);
5604 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Process " PID_FMT
" is a kernel thread, refusing.", pid
);
5609 void unit_log_success(Unit
*u
) {
5612 /* Let's show message "Deactivated successfully" in debug mode (when manager is user) rather than in info mode.
5613 * This message has low information value for regular users and it might be a bit overwhelming on a system with
5614 * a lot of devices. */
5616 MANAGER_IS_USER(u
->manager
) ? LOG_DEBUG
: LOG_INFO
,
5617 "MESSAGE_ID=" SD_MESSAGE_UNIT_SUCCESS_STR
,
5618 LOG_UNIT_INVOCATION_ID(u
),
5619 LOG_UNIT_MESSAGE(u
, "Deactivated successfully."));
5622 void unit_log_failure(Unit
*u
, const char *result
) {
5626 log_unit_struct(u
, LOG_WARNING
,
5627 "MESSAGE_ID=" SD_MESSAGE_UNIT_FAILURE_RESULT_STR
,
5628 LOG_UNIT_INVOCATION_ID(u
),
5629 LOG_UNIT_MESSAGE(u
, "Failed with result '%s'.", result
),
5630 "UNIT_RESULT=%s", result
);
5633 void unit_log_skip(Unit
*u
, const char *result
) {
5637 log_unit_struct(u
, LOG_INFO
,
5638 "MESSAGE_ID=" SD_MESSAGE_UNIT_SKIPPED_STR
,
5639 LOG_UNIT_INVOCATION_ID(u
),
5640 LOG_UNIT_MESSAGE(u
, "Skipped due to '%s'.", result
),
5641 "UNIT_RESULT=%s", result
);
5644 void unit_log_process_exit(
5647 const char *command
,
5657 /* If this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure
5658 * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption
5659 * that the service already logged the reason at a higher log level on its own. Otherwise, make it a
5663 else if (code
== CLD_EXITED
)
5666 level
= LOG_WARNING
;
5668 log_unit_struct(u
, level
,
5669 "MESSAGE_ID=" SD_MESSAGE_UNIT_PROCESS_EXIT_STR
,
5670 LOG_UNIT_MESSAGE(u
, "%s exited, code=%s, status=%i/%s%s",
5672 sigchld_code_to_string(code
), status
,
5673 strna(code
== CLD_EXITED
5674 ? exit_status_to_string(status
, EXIT_STATUS_FULL
)
5675 : signal_to_string(status
)),
5676 success
? " (success)" : ""),
5677 "EXIT_CODE=%s", sigchld_code_to_string(code
),
5678 "EXIT_STATUS=%i", status
,
5679 "COMMAND=%s", strna(command
),
5680 LOG_UNIT_INVOCATION_ID(u
));
5683 int unit_exit_status(Unit
*u
) {
5686 /* Returns the exit status to propagate for the most recent cycle of this unit. Returns a value in the range
5687 * 0…255 if there's something to propagate. EOPNOTSUPP if the concept does not apply to this unit type, ENODATA
5688 * if no data is currently known (for example because the unit hasn't deactivated yet) and EBADE if the main
5689 * service process has exited abnormally (signal/coredump). */
5691 if (!UNIT_VTABLE(u
)->exit_status
)
5694 return UNIT_VTABLE(u
)->exit_status(u
);
5697 int unit_failure_action_exit_status(Unit
*u
) {
5702 /* Returns the exit status to propagate on failure, or an error if there's nothing to propagate */
5704 if (u
->failure_action_exit_status
>= 0)
5705 return u
->failure_action_exit_status
;
5707 r
= unit_exit_status(u
);
5708 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5714 int unit_success_action_exit_status(Unit
*u
) {
5719 /* Returns the exit status to propagate on success, or an error if there's nothing to propagate */
5721 if (u
->success_action_exit_status
>= 0)
5722 return u
->success_action_exit_status
;
5724 r
= unit_exit_status(u
);
5725 if (r
== -EBADE
) /* Exited, but not cleanly (i.e. by signal or such) */
5731 int unit_test_trigger_loaded(Unit
*u
) {
5734 /* Tests whether the unit to trigger is loaded */
5736 trigger
= UNIT_TRIGGER(u
);
5738 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5739 "Refusing to start, no unit to trigger.");
5740 if (trigger
->load_state
!= UNIT_LOADED
)
5741 return log_unit_error_errno(u
, SYNTHETIC_ERRNO(ENOENT
),
5742 "Refusing to start, unit %s to trigger not loaded.", trigger
->id
);
5747 void unit_destroy_runtime_data(Unit
*u
, const ExecContext
*context
) {
5751 if (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_NO
||
5752 (context
->runtime_directory_preserve_mode
== EXEC_PRESERVE_RESTART
&& !unit_will_restart(u
)))
5753 exec_context_destroy_runtime_directory(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
]);
5755 exec_context_destroy_credentials(context
, u
->manager
->prefix
[EXEC_DIRECTORY_RUNTIME
], u
->id
);
5758 int unit_clean(Unit
*u
, ExecCleanMask mask
) {
5759 UnitActiveState state
;
5763 /* Special return values:
5765 * -EOPNOTSUPP → cleaning not supported for this unit type
5766 * -EUNATCH → cleaning not defined for this resource type
5767 * -EBUSY → unit currently can't be cleaned since it's running or not properly loaded, or has
5768 * a job queued or similar
5771 if (!UNIT_VTABLE(u
)->clean
)
5777 if (u
->load_state
!= UNIT_LOADED
)
5783 state
= unit_active_state(u
);
5784 if (!IN_SET(state
, UNIT_INACTIVE
))
5787 return UNIT_VTABLE(u
)->clean(u
, mask
);
5790 int unit_can_clean(Unit
*u
, ExecCleanMask
*ret
) {
5793 if (!UNIT_VTABLE(u
)->clean
||
5794 u
->load_state
!= UNIT_LOADED
) {
5799 /* When the clean() method is set, can_clean() really should be set too */
5800 assert(UNIT_VTABLE(u
)->can_clean
);
5802 return UNIT_VTABLE(u
)->can_clean(u
, ret
);
5805 bool unit_can_freeze(Unit
*u
) {
5808 if (UNIT_VTABLE(u
)->can_freeze
)
5809 return UNIT_VTABLE(u
)->can_freeze(u
);
5811 return UNIT_VTABLE(u
)->freeze
;
5814 void unit_frozen(Unit
*u
) {
5817 u
->freezer_state
= FREEZER_FROZEN
;
5819 bus_unit_send_pending_freezer_message(u
);
5822 void unit_thawed(Unit
*u
) {
5825 u
->freezer_state
= FREEZER_RUNNING
;
5827 bus_unit_send_pending_freezer_message(u
);
5830 static int unit_freezer_action(Unit
*u
, FreezerAction action
) {
5832 int (*method
)(Unit
*);
5836 assert(IN_SET(action
, FREEZER_FREEZE
, FREEZER_THAW
));
5838 method
= action
== FREEZER_FREEZE
? UNIT_VTABLE(u
)->freeze
: UNIT_VTABLE(u
)->thaw
;
5839 if (!method
|| !cg_freezer_supported())
5845 if (u
->load_state
!= UNIT_LOADED
)
5848 s
= unit_active_state(u
);
5849 if (s
!= UNIT_ACTIVE
)
5852 if (IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
))
5859 assert(IN_SET(u
->freezer_state
, FREEZER_FREEZING
, FREEZER_THAWING
));
5864 int unit_freeze(Unit
*u
) {
5865 return unit_freezer_action(u
, FREEZER_FREEZE
);
5868 int unit_thaw(Unit
*u
) {
5869 return unit_freezer_action(u
, FREEZER_THAW
);
5872 /* Wrappers around low-level cgroup freezer operations common for service and scope units */
5873 int unit_freeze_vtable_common(Unit
*u
) {
5874 return unit_cgroup_freezer_action(u
, FREEZER_FREEZE
);
5877 int unit_thaw_vtable_common(Unit
*u
) {
5878 return unit_cgroup_freezer_action(u
, FREEZER_THAW
);
5881 Condition
*unit_find_failed_condition(Unit
*u
) {
5882 Condition
*failed_trigger
= NULL
;
5883 bool has_succeeded_trigger
= false;
5885 if (u
->condition_result
)
5888 LIST_FOREACH(conditions
, c
, u
->conditions
)
5890 if (c
->result
== CONDITION_SUCCEEDED
)
5891 has_succeeded_trigger
= true;
5892 else if (!failed_trigger
)
5894 } else if (c
->result
!= CONDITION_SUCCEEDED
)
5897 return failed_trigger
&& !has_succeeded_trigger
? failed_trigger
: NULL
;
5900 static const char* const collect_mode_table
[_COLLECT_MODE_MAX
] = {
5901 [COLLECT_INACTIVE
] = "inactive",
5902 [COLLECT_INACTIVE_OR_FAILED
] = "inactive-or-failed",
5905 DEFINE_STRING_TABLE_LOOKUP(collect_mode
, CollectMode
);
5907 Unit
* unit_has_dependency(const Unit
*u
, UnitDependencyAtom atom
, Unit
*other
) {
5912 /* Checks if the unit has a dependency on 'other' with the specified dependency atom. If 'other' is
5913 * NULL checks if the unit has *any* dependency of that atom. Returns 'other' if found (or if 'other'
5914 * is NULL the first entry found), or NULL if not found. */
5916 UNIT_FOREACH_DEPENDENCY(i
, u
, atom
)
5917 if (!other
|| other
== i
)
5923 int unit_get_dependency_array(const Unit
*u
, UnitDependencyAtom atom
, Unit
***ret_array
) {
5924 _cleanup_free_ Unit
**array
= NULL
;
5931 /* Gets a list of units matching a specific atom as array. This is useful when iterating through
5932 * dependencies while modifying them: the array is an "atomic snapshot" of sorts, that can be read
5933 * while the dependency table is continuously updated. */
5935 UNIT_FOREACH_DEPENDENCY(other
, u
, atom
) {
5936 if (!GREEDY_REALLOC(array
, n
+ 1))
5942 *ret_array
= TAKE_PTR(array
);
5944 assert(n
<= INT_MAX
);