2 This file is part of systemd.
4 Copyright 2010 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include "sd-messages.h"
29 #include "alloc-util.h"
30 #include "bus-common-errors.h"
32 #include "cgroup-util.h"
33 #include "dbus-unit.h"
38 #include "fileio-label.h"
39 #include "format-util.h"
40 #include "id128-util.h"
41 #include "load-dropin.h"
42 #include "load-fragment.h"
47 #include "parse-util.h"
48 #include "path-util.h"
49 #include "process-util.h"
51 #include "signal-util.h"
53 #include "stat-util.h"
54 #include "stdio-util.h"
55 #include "string-util.h"
57 #include "umask-util.h"
58 #include "unit-name.h"
60 #include "user-util.h"
63 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
64 [UNIT_SERVICE
] = &service_vtable
,
65 [UNIT_SOCKET
] = &socket_vtable
,
66 [UNIT_BUSNAME
] = &busname_vtable
,
67 [UNIT_TARGET
] = &target_vtable
,
68 [UNIT_DEVICE
] = &device_vtable
,
69 [UNIT_MOUNT
] = &mount_vtable
,
70 [UNIT_AUTOMOUNT
] = &automount_vtable
,
71 [UNIT_SWAP
] = &swap_vtable
,
72 [UNIT_TIMER
] = &timer_vtable
,
73 [UNIT_PATH
] = &path_vtable
,
74 [UNIT_SLICE
] = &slice_vtable
,
75 [UNIT_SCOPE
] = &scope_vtable
78 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
);
80 Unit
*unit_new(Manager
*m
, size_t size
) {
84 assert(size
>= sizeof(Unit
));
90 u
->names
= set_new(&string_hash_ops
);
95 u
->type
= _UNIT_TYPE_INVALID
;
96 u
->default_dependencies
= true;
97 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
98 u
->unit_file_preset
= -1;
99 u
->on_failure_job_mode
= JOB_REPLACE
;
100 u
->cgroup_inotify_wd
= -1;
101 u
->job_timeout
= USEC_INFINITY
;
102 u
->ref_uid
= UID_INVALID
;
103 u
->ref_gid
= GID_INVALID
;
104 u
->cpu_usage_last
= NSEC_INFINITY
;
106 RATELIMIT_INIT(u
->start_limit
, m
->default_start_limit_interval
, m
->default_start_limit_burst
);
107 RATELIMIT_INIT(u
->auto_stop_ratelimit
, 10 * USEC_PER_SEC
, 16);
112 int unit_new_for_name(Manager
*m
, size_t size
, const char *name
, Unit
**ret
) {
116 u
= unit_new(m
, size
);
120 r
= unit_add_name(u
, name
);
130 bool unit_has_name(Unit
*u
, const char *name
) {
134 return set_contains(u
->names
, (char*) name
);
137 static void unit_init(Unit
*u
) {
144 assert(u
->type
>= 0);
146 cc
= unit_get_cgroup_context(u
);
148 cgroup_context_init(cc
);
150 /* Copy in the manager defaults into the cgroup
151 * context, _before_ the rest of the settings have
152 * been initialized */
154 cc
->cpu_accounting
= u
->manager
->default_cpu_accounting
;
155 cc
->io_accounting
= u
->manager
->default_io_accounting
;
156 cc
->blockio_accounting
= u
->manager
->default_blockio_accounting
;
157 cc
->memory_accounting
= u
->manager
->default_memory_accounting
;
158 cc
->tasks_accounting
= u
->manager
->default_tasks_accounting
;
160 if (u
->type
!= UNIT_SLICE
)
161 cc
->tasks_max
= u
->manager
->default_tasks_max
;
164 ec
= unit_get_exec_context(u
);
166 exec_context_init(ec
);
168 kc
= unit_get_kill_context(u
);
170 kill_context_init(kc
);
172 if (UNIT_VTABLE(u
)->init
)
173 UNIT_VTABLE(u
)->init(u
);
176 int unit_add_name(Unit
*u
, const char *text
) {
177 _cleanup_free_
char *s
= NULL
, *i
= NULL
;
184 if (unit_name_is_valid(text
, UNIT_NAME_TEMPLATE
)) {
189 r
= unit_name_replace_instance(text
, u
->instance
, &s
);
198 if (set_contains(u
->names
, s
))
200 if (hashmap_contains(u
->manager
->units
, s
))
203 if (!unit_name_is_valid(s
, UNIT_NAME_PLAIN
|UNIT_NAME_INSTANCE
))
206 t
= unit_name_to_type(s
);
210 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
)
213 r
= unit_name_to_instance(s
, &i
);
217 if (i
&& !unit_type_may_template(t
))
220 /* Ensure that this unit is either instanced or not instanced,
221 * but not both. Note that we do allow names with different
222 * instance names however! */
223 if (u
->type
!= _UNIT_TYPE_INVALID
&& !u
->instance
!= !i
)
226 if (!unit_type_may_alias(t
) && !set_isempty(u
->names
))
229 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
)
232 r
= set_put(u
->names
, s
);
237 r
= hashmap_put(u
->manager
->units
, s
, u
);
239 (void) set_remove(u
->names
, s
);
243 if (u
->type
== _UNIT_TYPE_INVALID
) {
248 LIST_PREPEND(units_by_type
, u
->manager
->units_by_type
[t
], u
);
257 unit_add_to_dbus_queue(u
);
261 int unit_choose_id(Unit
*u
, const char *name
) {
262 _cleanup_free_
char *t
= NULL
;
269 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
274 r
= unit_name_replace_instance(name
, u
->instance
, &t
);
281 /* Selects one of the names of this unit as the id */
282 s
= set_get(u
->names
, (char*) name
);
286 /* Determine the new instance from the new id */
287 r
= unit_name_to_instance(s
, &i
);
296 unit_add_to_dbus_queue(u
);
301 int unit_set_description(Unit
*u
, const char *description
) {
306 if (isempty(description
))
309 s
= strdup(description
);
314 free(u
->description
);
317 unit_add_to_dbus_queue(u
);
321 bool unit_check_gc(Unit
*u
) {
322 UnitActiveState state
;
332 state
= unit_active_state(u
);
333 inactive
= state
== UNIT_INACTIVE
;
335 /* If the unit is inactive and failed and no job is queued for
336 * it, then release its runtime resources */
337 if (UNIT_IS_INACTIVE_OR_FAILED(state
) &&
338 UNIT_VTABLE(u
)->release_resources
)
339 UNIT_VTABLE(u
)->release_resources(u
, inactive
);
341 /* But we keep the unit object around for longer when it is
342 * referenced or configured to not be gc'ed */
352 if (sd_bus_track_count(u
->bus_track
) > 0)
355 if (UNIT_VTABLE(u
)->check_gc
)
356 if (UNIT_VTABLE(u
)->check_gc(u
))
362 void unit_add_to_load_queue(Unit
*u
) {
364 assert(u
->type
!= _UNIT_TYPE_INVALID
);
366 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
369 LIST_PREPEND(load_queue
, u
->manager
->load_queue
, u
);
370 u
->in_load_queue
= true;
373 void unit_add_to_cleanup_queue(Unit
*u
) {
376 if (u
->in_cleanup_queue
)
379 LIST_PREPEND(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
380 u
->in_cleanup_queue
= true;
383 void unit_add_to_gc_queue(Unit
*u
) {
386 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
389 if (unit_check_gc(u
))
392 LIST_PREPEND(gc_queue
, u
->manager
->gc_queue
, u
);
393 u
->in_gc_queue
= true;
395 u
->manager
->n_in_gc_queue
++;
398 void unit_add_to_dbus_queue(Unit
*u
) {
400 assert(u
->type
!= _UNIT_TYPE_INVALID
);
402 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
405 /* Shortcut things if nobody cares */
406 if (sd_bus_track_count(u
->manager
->subscribed
) <= 0 &&
407 set_isempty(u
->manager
->private_buses
)) {
408 u
->sent_dbus_new_signal
= true;
412 LIST_PREPEND(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
413 u
->in_dbus_queue
= true;
416 static void bidi_set_free(Unit
*u
, Set
*s
) {
422 /* Frees the set and makes sure we are dropped from the
423 * inverse pointers */
425 SET_FOREACH(other
, s
, i
) {
428 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
429 set_remove(other
->dependencies
[d
], u
);
431 unit_add_to_gc_queue(other
);
437 static void unit_remove_transient(Unit
*u
) {
445 if (u
->fragment_path
)
446 (void) unlink(u
->fragment_path
);
448 STRV_FOREACH(i
, u
->dropin_paths
) {
449 _cleanup_free_
char *p
= NULL
, *pp
= NULL
;
451 p
= dirname_malloc(*i
); /* Get the drop-in directory from the drop-in file */
455 pp
= dirname_malloc(p
); /* Get the config directory from the drop-in directory */
459 /* Only drop transient drop-ins */
460 if (!path_equal(u
->manager
->lookup_paths
.transient
, pp
))
468 static void unit_free_requires_mounts_for(Unit
*u
) {
471 STRV_FOREACH(j
, u
->requires_mounts_for
) {
472 char s
[strlen(*j
) + 1];
474 PATH_FOREACH_PREFIX_MORE(s
, *j
) {
478 x
= hashmap_get2(u
->manager
->units_requiring_mounts_for
, s
, (void**) &y
);
484 if (set_isempty(x
)) {
485 hashmap_remove(u
->manager
->units_requiring_mounts_for
, y
);
492 u
->requires_mounts_for
= strv_free(u
->requires_mounts_for
);
495 static void unit_done(Unit
*u
) {
504 if (UNIT_VTABLE(u
)->done
)
505 UNIT_VTABLE(u
)->done(u
);
507 ec
= unit_get_exec_context(u
);
509 exec_context_done(ec
);
511 cc
= unit_get_cgroup_context(u
);
513 cgroup_context_done(cc
);
516 void unit_free(Unit
*u
) {
523 if (u
->transient_file
)
524 fclose(u
->transient_file
);
526 if (!MANAGER_IS_RELOADING(u
->manager
))
527 unit_remove_transient(u
);
529 bus_unit_send_removed_signal(u
);
533 sd_bus_slot_unref(u
->match_bus_slot
);
535 sd_bus_track_unref(u
->bus_track
);
536 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
538 unit_free_requires_mounts_for(u
);
540 SET_FOREACH(t
, u
->names
, i
)
541 hashmap_remove_value(u
->manager
->units
, t
, u
);
543 if (!sd_id128_is_null(u
->invocation_id
))
544 hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
558 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
559 bidi_set_free(u
, u
->dependencies
[d
]);
561 if (u
->type
!= _UNIT_TYPE_INVALID
)
562 LIST_REMOVE(units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
564 if (u
->in_load_queue
)
565 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
567 if (u
->in_dbus_queue
)
568 LIST_REMOVE(dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
570 if (u
->in_cleanup_queue
)
571 LIST_REMOVE(cleanup_queue
, u
->manager
->cleanup_queue
, u
);
573 if (u
->in_gc_queue
) {
574 LIST_REMOVE(gc_queue
, u
->manager
->gc_queue
, u
);
575 u
->manager
->n_in_gc_queue
--;
578 if (u
->in_cgroup_queue
)
579 LIST_REMOVE(cgroup_queue
, u
->manager
->cgroup_queue
, u
);
581 unit_release_cgroup(u
);
583 unit_unref_uid_gid(u
, false);
585 (void) manager_update_failed_units(u
->manager
, u
, false);
586 set_remove(u
->manager
->startup_units
, u
);
588 free(u
->description
);
589 strv_free(u
->documentation
);
590 free(u
->fragment_path
);
591 free(u
->source_path
);
592 strv_free(u
->dropin_paths
);
595 free(u
->job_timeout_reboot_arg
);
597 set_free_free(u
->names
);
599 unit_unwatch_all_pids(u
);
601 condition_free_list(u
->conditions
);
602 condition_free_list(u
->asserts
);
606 unit_ref_unset(&u
->slice
);
609 unit_ref_unset(u
->refs
);
614 UnitActiveState
unit_active_state(Unit
*u
) {
617 if (u
->load_state
== UNIT_MERGED
)
618 return unit_active_state(unit_follow_merge(u
));
620 /* After a reload it might happen that a unit is not correctly
621 * loaded but still has a process around. That's why we won't
622 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
624 return UNIT_VTABLE(u
)->active_state(u
);
627 const char* unit_sub_state_to_string(Unit
*u
) {
630 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
633 static int complete_move(Set
**s
, Set
**other
) {
643 r
= set_move(*s
, *other
);
654 static int merge_names(Unit
*u
, Unit
*other
) {
662 r
= complete_move(&u
->names
, &other
->names
);
666 set_free_free(other
->names
);
670 SET_FOREACH(t
, u
->names
, i
)
671 assert_se(hashmap_replace(u
->manager
->units
, t
, u
) == 0);
676 static int reserve_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
681 assert(d
< _UNIT_DEPENDENCY_MAX
);
684 * If u does not have this dependency set allocated, there is no need
685 * to reserve anything. In that case other's set will be transferred
686 * as a whole to u by complete_move().
688 if (!u
->dependencies
[d
])
691 /* merge_dependencies() will skip a u-on-u dependency */
692 n_reserve
= set_size(other
->dependencies
[d
]) - !!set_get(other
->dependencies
[d
], u
);
694 return set_reserve(u
->dependencies
[d
], n_reserve
);
697 static void merge_dependencies(Unit
*u
, Unit
*other
, const char *other_id
, UnitDependency d
) {
704 assert(d
< _UNIT_DEPENDENCY_MAX
);
706 /* Fix backwards pointers */
707 SET_FOREACH(back
, other
->dependencies
[d
], i
) {
710 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++) {
711 /* Do not add dependencies between u and itself */
713 if (set_remove(back
->dependencies
[k
], other
))
714 maybe_warn_about_dependency(u
, other_id
, k
);
716 r
= set_remove_and_put(back
->dependencies
[k
], other
, u
);
718 set_remove(back
->dependencies
[k
], other
);
720 assert(r
>= 0 || r
== -ENOENT
);
725 /* Also do not move dependencies on u to itself */
726 back
= set_remove(other
->dependencies
[d
], u
);
728 maybe_warn_about_dependency(u
, other_id
, d
);
730 /* The move cannot fail. The caller must have performed a reservation. */
731 assert_se(complete_move(&u
->dependencies
[d
], &other
->dependencies
[d
]) == 0);
733 other
->dependencies
[d
] = set_free(other
->dependencies
[d
]);
736 int unit_merge(Unit
*u
, Unit
*other
) {
738 const char *other_id
= NULL
;
743 assert(u
->manager
== other
->manager
);
744 assert(u
->type
!= _UNIT_TYPE_INVALID
);
746 other
= unit_follow_merge(other
);
751 if (u
->type
!= other
->type
)
754 if (!u
->instance
!= !other
->instance
)
757 if (!unit_type_may_alias(u
->type
)) /* Merging only applies to unit names that support aliases */
760 if (other
->load_state
!= UNIT_STUB
&&
761 other
->load_state
!= UNIT_NOT_FOUND
)
770 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
774 other_id
= strdupa(other
->id
);
776 /* Make reservations to ensure merge_dependencies() won't fail */
777 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
778 r
= reserve_dependencies(u
, other
, d
);
780 * We don't rollback reservations if we fail. We don't have
781 * a way to undo reservations. A reservation is not a leak.
788 r
= merge_names(u
, other
);
792 /* Redirect all references */
794 unit_ref_set(other
->refs
, u
);
796 /* Merge dependencies */
797 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
798 merge_dependencies(u
, other
, other_id
, d
);
800 other
->load_state
= UNIT_MERGED
;
801 other
->merged_into
= u
;
803 /* If there is still some data attached to the other node, we
804 * don't need it anymore, and can free it. */
805 if (other
->load_state
!= UNIT_STUB
)
806 if (UNIT_VTABLE(other
)->done
)
807 UNIT_VTABLE(other
)->done(other
);
809 unit_add_to_dbus_queue(u
);
810 unit_add_to_cleanup_queue(other
);
815 int unit_merge_by_name(Unit
*u
, const char *name
) {
816 _cleanup_free_
char *s
= NULL
;
823 if (unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
827 r
= unit_name_replace_instance(name
, u
->instance
, &s
);
834 other
= manager_get_unit(u
->manager
, name
);
836 return unit_merge(u
, other
);
838 return unit_add_name(u
, name
);
841 Unit
* unit_follow_merge(Unit
*u
) {
844 while (u
->load_state
== UNIT_MERGED
)
845 assert_se(u
= u
->merged_into
);
850 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
856 if (c
->working_directory
) {
857 r
= unit_require_mounts_for(u
, c
->working_directory
);
862 if (c
->root_directory
) {
863 r
= unit_require_mounts_for(u
, c
->root_directory
);
868 if (!MANAGER_IS_SYSTEM(u
->manager
))
871 if (c
->private_tmp
) {
872 r
= unit_require_mounts_for(u
, "/tmp");
876 r
= unit_require_mounts_for(u
, "/var/tmp");
881 if (!IN_SET(c
->std_output
,
882 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
883 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
884 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
) &&
885 !IN_SET(c
->std_error
,
886 EXEC_OUTPUT_JOURNAL
, EXEC_OUTPUT_JOURNAL_AND_CONSOLE
,
887 EXEC_OUTPUT_KMSG
, EXEC_OUTPUT_KMSG_AND_CONSOLE
,
888 EXEC_OUTPUT_SYSLOG
, EXEC_OUTPUT_SYSLOG_AND_CONSOLE
))
891 /* If syslog or kernel logging is requested, make sure our own
892 * logging daemon is run first. */
894 r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, NULL
, true);
901 const char *unit_description(Unit
*u
) {
905 return u
->description
;
910 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
916 timestamp0
[FORMAT_TIMESTAMP_MAX
],
917 timestamp1
[FORMAT_TIMESTAMP_MAX
],
918 timestamp2
[FORMAT_TIMESTAMP_MAX
],
919 timestamp3
[FORMAT_TIMESTAMP_MAX
],
920 timestamp4
[FORMAT_TIMESTAMP_MAX
],
921 timespan
[FORMAT_TIMESPAN_MAX
];
923 _cleanup_set_free_ Set
*following_set
= NULL
;
928 assert(u
->type
>= 0);
930 prefix
= strempty(prefix
);
931 prefix2
= strjoina(prefix
, "\t");
935 "%s\tDescription: %s\n"
937 "%s\tUnit Load State: %s\n"
938 "%s\tUnit Active State: %s\n"
939 "%s\tState Change Timestamp: %s\n"
940 "%s\tInactive Exit Timestamp: %s\n"
941 "%s\tActive Enter Timestamp: %s\n"
942 "%s\tActive Exit Timestamp: %s\n"
943 "%s\tInactive Enter Timestamp: %s\n"
944 "%s\tGC Check Good: %s\n"
945 "%s\tNeed Daemon Reload: %s\n"
946 "%s\tTransient: %s\n"
947 "%s\tPerpetual: %s\n"
950 "%s\tCGroup realized: %s\n"
951 "%s\tCGroup mask: 0x%x\n"
952 "%s\tCGroup members mask: 0x%x\n",
954 prefix
, unit_description(u
),
955 prefix
, strna(u
->instance
),
956 prefix
, unit_load_state_to_string(u
->load_state
),
957 prefix
, unit_active_state_to_string(unit_active_state(u
)),
958 prefix
, strna(format_timestamp(timestamp0
, sizeof(timestamp0
), u
->state_change_timestamp
.realtime
)),
959 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->inactive_exit_timestamp
.realtime
)),
960 prefix
, strna(format_timestamp(timestamp2
, sizeof(timestamp2
), u
->active_enter_timestamp
.realtime
)),
961 prefix
, strna(format_timestamp(timestamp3
, sizeof(timestamp3
), u
->active_exit_timestamp
.realtime
)),
962 prefix
, strna(format_timestamp(timestamp4
, sizeof(timestamp4
), u
->inactive_enter_timestamp
.realtime
)),
963 prefix
, yes_no(unit_check_gc(u
)),
964 prefix
, yes_no(unit_need_daemon_reload(u
)),
965 prefix
, yes_no(u
->transient
),
966 prefix
, yes_no(u
->perpetual
),
967 prefix
, strna(unit_slice_name(u
)),
968 prefix
, strna(u
->cgroup_path
),
969 prefix
, yes_no(u
->cgroup_realized
),
970 prefix
, u
->cgroup_realized_mask
,
971 prefix
, u
->cgroup_members_mask
);
973 SET_FOREACH(t
, u
->names
, i
)
974 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
976 if (!sd_id128_is_null(u
->invocation_id
))
977 fprintf(f
, "%s\tInvocation ID: " SD_ID128_FORMAT_STR
"\n",
978 prefix
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
980 STRV_FOREACH(j
, u
->documentation
)
981 fprintf(f
, "%s\tDocumentation: %s\n", prefix
, *j
);
983 following
= unit_following(u
);
985 fprintf(f
, "%s\tFollowing: %s\n", prefix
, following
->id
);
987 r
= unit_following_set(u
, &following_set
);
991 SET_FOREACH(other
, following_set
, i
)
992 fprintf(f
, "%s\tFollowing Set Member: %s\n", prefix
, other
->id
);
995 if (u
->fragment_path
)
996 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->fragment_path
);
999 fprintf(f
, "%s\tSource Path: %s\n", prefix
, u
->source_path
);
1001 STRV_FOREACH(j
, u
->dropin_paths
)
1002 fprintf(f
, "%s\tDropIn Path: %s\n", prefix
, *j
);
1004 if (u
->job_timeout
!= USEC_INFINITY
)
1005 fprintf(f
, "%s\tJob Timeout: %s\n", prefix
, format_timespan(timespan
, sizeof(timespan
), u
->job_timeout
, 0));
1007 if (u
->job_timeout_action
!= EMERGENCY_ACTION_NONE
)
1008 fprintf(f
, "%s\tJob Timeout Action: %s\n", prefix
, emergency_action_to_string(u
->job_timeout_action
));
1010 if (u
->job_timeout_reboot_arg
)
1011 fprintf(f
, "%s\tJob Timeout Reboot Argument: %s\n", prefix
, u
->job_timeout_reboot_arg
);
1013 condition_dump_list(u
->conditions
, f
, prefix
, condition_type_to_string
);
1014 condition_dump_list(u
->asserts
, f
, prefix
, assert_type_to_string
);
1016 if (dual_timestamp_is_set(&u
->condition_timestamp
))
1018 "%s\tCondition Timestamp: %s\n"
1019 "%s\tCondition Result: %s\n",
1020 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->condition_timestamp
.realtime
)),
1021 prefix
, yes_no(u
->condition_result
));
1023 if (dual_timestamp_is_set(&u
->assert_timestamp
))
1025 "%s\tAssert Timestamp: %s\n"
1026 "%s\tAssert Result: %s\n",
1027 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->assert_timestamp
.realtime
)),
1028 prefix
, yes_no(u
->assert_result
));
1030 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
1033 SET_FOREACH(other
, u
->dependencies
[d
], i
)
1034 fprintf(f
, "%s\t%s: %s\n", prefix
, unit_dependency_to_string(d
), other
->id
);
1037 if (!strv_isempty(u
->requires_mounts_for
)) {
1039 "%s\tRequiresMountsFor:", prefix
);
1041 STRV_FOREACH(j
, u
->requires_mounts_for
)
1042 fprintf(f
, " %s", *j
);
1047 if (u
->load_state
== UNIT_LOADED
) {
1050 "%s\tStopWhenUnneeded: %s\n"
1051 "%s\tRefuseManualStart: %s\n"
1052 "%s\tRefuseManualStop: %s\n"
1053 "%s\tDefaultDependencies: %s\n"
1054 "%s\tOnFailureJobMode: %s\n"
1055 "%s\tIgnoreOnIsolate: %s\n",
1056 prefix
, yes_no(u
->stop_when_unneeded
),
1057 prefix
, yes_no(u
->refuse_manual_start
),
1058 prefix
, yes_no(u
->refuse_manual_stop
),
1059 prefix
, yes_no(u
->default_dependencies
),
1060 prefix
, job_mode_to_string(u
->on_failure_job_mode
),
1061 prefix
, yes_no(u
->ignore_on_isolate
));
1063 if (UNIT_VTABLE(u
)->dump
)
1064 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
1066 } else if (u
->load_state
== UNIT_MERGED
)
1068 "%s\tMerged into: %s\n",
1069 prefix
, u
->merged_into
->id
);
1070 else if (u
->load_state
== UNIT_ERROR
)
1071 fprintf(f
, "%s\tLoad Error Code: %s\n", prefix
, strerror(-u
->load_error
));
1073 for (n
= sd_bus_track_first(u
->bus_track
); n
; n
= sd_bus_track_next(u
->bus_track
))
1074 fprintf(f
, "%s\tBus Ref: %s\n", prefix
, n
);
1077 job_dump(u
->job
, f
, prefix2
);
1080 job_dump(u
->nop_job
, f
, prefix2
);
1083 /* Common implementation for multiple backends */
1084 int unit_load_fragment_and_dropin(Unit
*u
) {
1089 /* Load a .{service,socket,...} file */
1090 r
= unit_load_fragment(u
);
1094 if (u
->load_state
== UNIT_STUB
)
1097 /* Load drop-in directory data */
1098 r
= unit_load_dropin(unit_follow_merge(u
));
1105 /* Common implementation for multiple backends */
1106 int unit_load_fragment_and_dropin_optional(Unit
*u
) {
1111 /* Same as unit_load_fragment_and_dropin(), but whether
1112 * something can be loaded or not doesn't matter. */
1114 /* Load a .service file */
1115 r
= unit_load_fragment(u
);
1119 if (u
->load_state
== UNIT_STUB
)
1120 u
->load_state
= UNIT_LOADED
;
1122 /* Load drop-in directory data */
1123 r
= unit_load_dropin(unit_follow_merge(u
));
1130 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
1134 if (target
->type
!= UNIT_TARGET
)
1137 /* Only add the dependency if both units are loaded, so that
1138 * that loop check below is reliable */
1139 if (u
->load_state
!= UNIT_LOADED
||
1140 target
->load_state
!= UNIT_LOADED
)
1143 /* If either side wants no automatic dependencies, then let's
1145 if (!u
->default_dependencies
||
1146 !target
->default_dependencies
)
1149 /* Don't create loops */
1150 if (set_get(target
->dependencies
[UNIT_BEFORE
], u
))
1153 return unit_add_dependency(target
, UNIT_AFTER
, u
, true);
1156 static int unit_add_target_dependencies(Unit
*u
) {
1158 static const UnitDependency deps
[] = {
1172 for (k
= 0; k
< ELEMENTSOF(deps
); k
++)
1173 SET_FOREACH(target
, u
->dependencies
[deps
[k
]], i
) {
1174 r
= unit_add_default_target_dependency(u
, target
);
1182 static int unit_add_slice_dependencies(Unit
*u
) {
1185 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
1188 if (UNIT_ISSET(u
->slice
))
1189 return unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_REQUIRES
, UNIT_DEREF(u
->slice
), true);
1191 if (unit_has_name(u
, SPECIAL_ROOT_SLICE
))
1194 return unit_add_two_dependencies_by_name(u
, UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_ROOT_SLICE
, NULL
, true);
1197 static int unit_add_mount_dependencies(Unit
*u
) {
1203 STRV_FOREACH(i
, u
->requires_mounts_for
) {
1204 char prefix
[strlen(*i
) + 1];
1206 PATH_FOREACH_PREFIX_MORE(prefix
, *i
) {
1207 _cleanup_free_
char *p
= NULL
;
1210 r
= unit_name_from_path(prefix
, ".mount", &p
);
1214 m
= manager_get_unit(u
->manager
, p
);
1216 /* Make sure to load the mount unit if
1217 * it exists. If so the dependencies
1218 * on this unit will be added later
1219 * during the loading of the mount
1221 (void) manager_load_unit_prepare(u
->manager
, p
, NULL
, NULL
, &m
);
1227 if (m
->load_state
!= UNIT_LOADED
)
1230 r
= unit_add_dependency(u
, UNIT_AFTER
, m
, true);
1234 if (m
->fragment_path
) {
1235 r
= unit_add_dependency(u
, UNIT_REQUIRES
, m
, true);
1245 static int unit_add_startup_units(Unit
*u
) {
1249 c
= unit_get_cgroup_context(u
);
1253 if (c
->startup_cpu_shares
== CGROUP_CPU_SHARES_INVALID
&&
1254 c
->startup_io_weight
== CGROUP_WEIGHT_INVALID
&&
1255 c
->startup_blockio_weight
== CGROUP_BLKIO_WEIGHT_INVALID
)
1258 r
= set_ensure_allocated(&u
->manager
->startup_units
, NULL
);
1262 return set_put(u
->manager
->startup_units
, u
);
1265 int unit_load(Unit
*u
) {
1270 if (u
->in_load_queue
) {
1271 LIST_REMOVE(load_queue
, u
->manager
->load_queue
, u
);
1272 u
->in_load_queue
= false;
1275 if (u
->type
== _UNIT_TYPE_INVALID
)
1278 if (u
->load_state
!= UNIT_STUB
)
1281 if (u
->transient_file
) {
1282 r
= fflush_and_check(u
->transient_file
);
1286 fclose(u
->transient_file
);
1287 u
->transient_file
= NULL
;
1289 u
->fragment_mtime
= now(CLOCK_REALTIME
);
1292 if (UNIT_VTABLE(u
)->load
) {
1293 r
= UNIT_VTABLE(u
)->load(u
);
1298 if (u
->load_state
== UNIT_STUB
) {
1303 if (u
->load_state
== UNIT_LOADED
) {
1305 r
= unit_add_target_dependencies(u
);
1309 r
= unit_add_slice_dependencies(u
);
1313 r
= unit_add_mount_dependencies(u
);
1317 r
= unit_add_startup_units(u
);
1321 if (u
->on_failure_job_mode
== JOB_ISOLATE
&& set_size(u
->dependencies
[UNIT_ON_FAILURE
]) > 1) {
1322 log_unit_error(u
, "More than one OnFailure= dependencies specified but OnFailureJobMode=isolate set. Refusing.");
1327 unit_update_cgroup_members_masks(u
);
1330 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
1332 unit_add_to_dbus_queue(unit_follow_merge(u
));
1333 unit_add_to_gc_queue(u
);
1338 u
->load_state
= u
->load_state
== UNIT_STUB
? UNIT_NOT_FOUND
: UNIT_ERROR
;
1340 unit_add_to_dbus_queue(u
);
1341 unit_add_to_gc_queue(u
);
1343 log_unit_debug_errno(u
, r
, "Failed to load configuration: %m");
1348 static bool unit_condition_test_list(Unit
*u
, Condition
*first
, const char *(*to_string
)(ConditionType t
)) {
1355 /* If the condition list is empty, then it is true */
1359 /* Otherwise, if all of the non-trigger conditions apply and
1360 * if any of the trigger conditions apply (unless there are
1361 * none) we return true */
1362 LIST_FOREACH(conditions
, c
, first
) {
1365 r
= condition_test(c
);
1368 "Couldn't determine result for %s=%s%s%s, assuming failed: %m",
1370 c
->trigger
? "|" : "",
1371 c
->negate
? "!" : "",
1377 c
->trigger
? "|" : "",
1378 c
->negate
? "!" : "",
1380 condition_result_to_string(c
->result
));
1382 if (!c
->trigger
&& r
<= 0)
1385 if (c
->trigger
&& triggered
<= 0)
1389 return triggered
!= 0;
1392 static bool unit_condition_test(Unit
*u
) {
1395 dual_timestamp_get(&u
->condition_timestamp
);
1396 u
->condition_result
= unit_condition_test_list(u
, u
->conditions
, condition_type_to_string
);
1398 return u
->condition_result
;
1401 static bool unit_assert_test(Unit
*u
) {
1404 dual_timestamp_get(&u
->assert_timestamp
);
1405 u
->assert_result
= unit_condition_test_list(u
, u
->asserts
, assert_type_to_string
);
1407 return u
->assert_result
;
1410 void unit_status_printf(Unit
*u
, const char *status
, const char *unit_status_msg_format
) {
1411 DISABLE_WARNING_FORMAT_NONLITERAL
;
1412 manager_status_printf(u
->manager
, STATUS_TYPE_NORMAL
, status
, unit_status_msg_format
, unit_description(u
));
1416 _pure_
static const char* unit_get_status_message_format(Unit
*u
, JobType t
) {
1418 const UnitStatusMessageFormats
*format_table
;
1421 assert(IN_SET(t
, JOB_START
, JOB_STOP
, JOB_RELOAD
));
1423 if (t
!= JOB_RELOAD
) {
1424 format_table
= &UNIT_VTABLE(u
)->status_message_formats
;
1426 format
= format_table
->starting_stopping
[t
== JOB_STOP
];
1432 /* Return generic strings */
1434 return "Starting %s.";
1435 else if (t
== JOB_STOP
)
1436 return "Stopping %s.";
1438 return "Reloading %s.";
1441 static void unit_status_print_starting_stopping(Unit
*u
, JobType t
) {
1446 /* Reload status messages have traditionally not been printed to console. */
1447 if (!IN_SET(t
, JOB_START
, JOB_STOP
))
1450 format
= unit_get_status_message_format(u
, t
);
1452 DISABLE_WARNING_FORMAT_NONLITERAL
;
1453 unit_status_printf(u
, "", format
);
1457 static void unit_status_log_starting_stopping_reloading(Unit
*u
, JobType t
) {
1464 if (!IN_SET(t
, JOB_START
, JOB_STOP
, JOB_RELOAD
))
1467 if (log_on_console())
1470 /* We log status messages for all units and all operations. */
1472 format
= unit_get_status_message_format(u
, t
);
1474 DISABLE_WARNING_FORMAT_NONLITERAL
;
1475 snprintf(buf
, sizeof buf
, format
, unit_description(u
));
1478 mid
= t
== JOB_START
? SD_MESSAGE_UNIT_STARTING
:
1479 t
== JOB_STOP
? SD_MESSAGE_UNIT_STOPPING
:
1480 SD_MESSAGE_UNIT_RELOADING
;
1482 /* Note that we deliberately use LOG_MESSAGE() instead of
1483 * LOG_UNIT_MESSAGE() here, since this is supposed to mimic
1484 * closely what is written to screen using the status output,
1485 * which is supposed the highest level, friendliest output
1486 * possible, which means we should avoid the low-level unit
1488 log_struct(LOG_INFO
,
1489 LOG_MESSAGE_ID(mid
),
1491 LOG_MESSAGE("%s", buf
),
1495 void unit_status_emit_starting_stopping_reloading(Unit
*u
, JobType t
) {
1498 assert(t
< _JOB_TYPE_MAX
);
1500 unit_status_log_starting_stopping_reloading(u
, t
);
1501 unit_status_print_starting_stopping(u
, t
);
1504 int unit_start_limit_test(Unit
*u
) {
1507 if (ratelimit_test(&u
->start_limit
)) {
1508 u
->start_limit_hit
= false;
1512 log_unit_warning(u
, "Start request repeated too quickly.");
1513 u
->start_limit_hit
= true;
1515 return emergency_action(u
->manager
, u
->start_limit_action
, u
->reboot_arg
, "unit failed");
1519 * -EBADR: This unit type does not support starting.
1520 * -EALREADY: Unit is already started.
1521 * -EAGAIN: An operation is already in progress. Retry later.
1522 * -ECANCELED: Too many requests for now.
1523 * -EPROTO: Assert failed
1524 * -EINVAL: Unit not loaded
1525 * -EOPNOTSUPP: Unit type not supported
1527 int unit_start(Unit
*u
) {
1528 UnitActiveState state
;
1533 /* If this is already started, then this will succeed. Note
1534 * that this will even succeed if this unit is not startable
1535 * by the user. This is relied on to detect when we need to
1536 * wait for units and when waiting is finished. */
1537 state
= unit_active_state(u
);
1538 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
1541 /* Units that aren't loaded cannot be started */
1542 if (u
->load_state
!= UNIT_LOADED
)
1545 /* If the conditions failed, don't do anything at all. If we
1546 * already are activating this call might still be useful to
1547 * speed up activation in case there is some hold-off time,
1548 * but we don't want to recheck the condition in that case. */
1549 if (state
!= UNIT_ACTIVATING
&&
1550 !unit_condition_test(u
)) {
1551 log_unit_debug(u
, "Starting requested but condition failed. Not starting unit.");
1555 /* If the asserts failed, fail the entire job */
1556 if (state
!= UNIT_ACTIVATING
&&
1557 !unit_assert_test(u
)) {
1558 log_unit_notice(u
, "Starting requested but asserts failed.");
1562 /* Units of types that aren't supported cannot be
1563 * started. Note that we do this test only after the condition
1564 * checks, so that we rather return condition check errors
1565 * (which are usually not considered a true failure) than "not
1566 * supported" errors (which are considered a failure).
1568 if (!unit_supported(u
))
1571 /* Forward to the main object, if we aren't it. */
1572 following
= unit_following(u
);
1574 log_unit_debug(u
, "Redirecting start request from %s to %s.", u
->id
, following
->id
);
1575 return unit_start(following
);
1578 /* If it is stopped, but we cannot start it, then fail */
1579 if (!UNIT_VTABLE(u
)->start
)
1582 /* We don't suppress calls to ->start() here when we are
1583 * already starting, to allow this request to be used as a
1584 * "hurry up" call, for example when the unit is in some "auto
1585 * restart" state where it waits for a holdoff timer to elapse
1586 * before it will start again. */
1588 unit_add_to_dbus_queue(u
);
1590 return UNIT_VTABLE(u
)->start(u
);
1593 bool unit_can_start(Unit
*u
) {
1596 if (u
->load_state
!= UNIT_LOADED
)
1599 if (!unit_supported(u
))
1602 return !!UNIT_VTABLE(u
)->start
;
1605 bool unit_can_isolate(Unit
*u
) {
1608 return unit_can_start(u
) &&
1613 * -EBADR: This unit type does not support stopping.
1614 * -EALREADY: Unit is already stopped.
1615 * -EAGAIN: An operation is already in progress. Retry later.
1617 int unit_stop(Unit
*u
) {
1618 UnitActiveState state
;
1623 state
= unit_active_state(u
);
1624 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
1627 following
= unit_following(u
);
1629 log_unit_debug(u
, "Redirecting stop request from %s to %s.", u
->id
, following
->id
);
1630 return unit_stop(following
);
1633 if (!UNIT_VTABLE(u
)->stop
)
1636 unit_add_to_dbus_queue(u
);
1638 return UNIT_VTABLE(u
)->stop(u
);
1641 bool unit_can_stop(Unit
*u
) {
1644 if (!unit_supported(u
))
1650 return !!UNIT_VTABLE(u
)->stop
;
1654 * -EBADR: This unit type does not support reloading.
1655 * -ENOEXEC: Unit is not started.
1656 * -EAGAIN: An operation is already in progress. Retry later.
1658 int unit_reload(Unit
*u
) {
1659 UnitActiveState state
;
1664 if (u
->load_state
!= UNIT_LOADED
)
1667 if (!unit_can_reload(u
))
1670 state
= unit_active_state(u
);
1671 if (state
== UNIT_RELOADING
)
1674 if (state
!= UNIT_ACTIVE
) {
1675 log_unit_warning(u
, "Unit cannot be reloaded because it is inactive.");
1679 following
= unit_following(u
);
1681 log_unit_debug(u
, "Redirecting reload request from %s to %s.", u
->id
, following
->id
);
1682 return unit_reload(following
);
1685 unit_add_to_dbus_queue(u
);
1687 return UNIT_VTABLE(u
)->reload(u
);
1690 bool unit_can_reload(Unit
*u
) {
1693 if (!UNIT_VTABLE(u
)->reload
)
1696 if (!UNIT_VTABLE(u
)->can_reload
)
1699 return UNIT_VTABLE(u
)->can_reload(u
);
1702 static void unit_check_unneeded(Unit
*u
) {
1704 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
1706 static const UnitDependency needed_dependencies
[] = {
1720 /* If this service shall be shut down when unneeded then do
1723 if (!u
->stop_when_unneeded
)
1726 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
1729 for (j
= 0; j
< ELEMENTSOF(needed_dependencies
); j
++)
1730 SET_FOREACH(other
, u
->dependencies
[needed_dependencies
[j
]], i
)
1731 if (unit_active_or_pending(other
))
1734 /* If stopping a unit fails continuously we might enter a stop
1735 * loop here, hence stop acting on the service being
1736 * unnecessary after a while. */
1737 if (!ratelimit_test(&u
->auto_stop_ratelimit
)) {
1738 log_unit_warning(u
, "Unit not needed anymore, but not stopping since we tried this too often recently.");
1742 log_unit_info(u
, "Unit not needed anymore. Stopping.");
1744 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1745 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, &error
, NULL
);
1747 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
1750 static void unit_check_binds_to(Unit
*u
) {
1751 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
1762 if (unit_active_state(u
) != UNIT_ACTIVE
)
1765 SET_FOREACH(other
, u
->dependencies
[UNIT_BINDS_TO
], i
) {
1769 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
1779 /* If stopping a unit fails continuously we might enter a stop
1780 * loop here, hence stop acting on the service being
1781 * unnecessary after a while. */
1782 if (!ratelimit_test(&u
->auto_stop_ratelimit
)) {
1783 log_unit_warning(u
, "Unit is bound to inactive unit %s, but not stopping since we tried this too often recently.", other
->id
);
1788 log_unit_info(u
, "Unit is bound to inactive unit %s. Stopping, too.", other
->id
);
1790 /* A unit we need to run is gone. Sniff. Let's stop this. */
1791 r
= manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, &error
, NULL
);
1793 log_unit_warning_errno(u
, r
, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error
, r
));
1796 static void retroactively_start_dependencies(Unit
*u
) {
1801 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
1803 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUIRES
], i
)
1804 if (!set_get(u
->dependencies
[UNIT_AFTER
], other
) &&
1805 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1806 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
);
1808 SET_FOREACH(other
, u
->dependencies
[UNIT_BINDS_TO
], i
)
1809 if (!set_get(u
->dependencies
[UNIT_AFTER
], other
) &&
1810 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1811 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, NULL
, NULL
);
1813 SET_FOREACH(other
, u
->dependencies
[UNIT_WANTS
], i
)
1814 if (!set_get(u
->dependencies
[UNIT_AFTER
], other
) &&
1815 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1816 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, NULL
, NULL
);
1818 SET_FOREACH(other
, u
->dependencies
[UNIT_CONFLICTS
], i
)
1819 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1820 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
1822 SET_FOREACH(other
, u
->dependencies
[UNIT_CONFLICTED_BY
], i
)
1823 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1824 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
1827 static void retroactively_stop_dependencies(Unit
*u
) {
1832 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
1834 /* Pull down units which are bound to us recursively if enabled */
1835 SET_FOREACH(other
, u
->dependencies
[UNIT_BOUND_BY
], i
)
1836 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1837 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, NULL
, NULL
);
1840 static void check_unneeded_dependencies(Unit
*u
) {
1845 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
1847 /* Garbage collect services that might not be needed anymore, if enabled */
1848 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUIRES
], i
)
1849 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1850 unit_check_unneeded(other
);
1851 SET_FOREACH(other
, u
->dependencies
[UNIT_WANTS
], i
)
1852 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1853 unit_check_unneeded(other
);
1854 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUISITE
], i
)
1855 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1856 unit_check_unneeded(other
);
1857 SET_FOREACH(other
, u
->dependencies
[UNIT_BINDS_TO
], i
)
1858 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1859 unit_check_unneeded(other
);
1862 void unit_start_on_failure(Unit
*u
) {
1868 if (set_size(u
->dependencies
[UNIT_ON_FAILURE
]) <= 0)
1871 log_unit_info(u
, "Triggering OnFailure= dependencies.");
1873 SET_FOREACH(other
, u
->dependencies
[UNIT_ON_FAILURE
], i
) {
1876 r
= manager_add_job(u
->manager
, JOB_START
, other
, u
->on_failure_job_mode
, NULL
, NULL
);
1878 log_unit_error_errno(u
, r
, "Failed to enqueue OnFailure= job: %m");
1882 void unit_trigger_notify(Unit
*u
) {
1888 SET_FOREACH(other
, u
->dependencies
[UNIT_TRIGGERED_BY
], i
)
1889 if (UNIT_VTABLE(other
)->trigger_notify
)
1890 UNIT_VTABLE(other
)->trigger_notify(other
, u
);
1893 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, bool reload_success
) {
1898 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
1899 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
1901 /* Note that this is called for all low-level state changes,
1902 * even if they might map to the same high-level
1903 * UnitActiveState! That means that ns == os is an expected
1904 * behavior here. For example: if a mount point is remounted
1905 * this function will be called too! */
1909 /* Update timestamps for state changes */
1910 if (!MANAGER_IS_RELOADING(m
)) {
1911 dual_timestamp_get(&u
->state_change_timestamp
);
1913 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
1914 u
->inactive_exit_timestamp
= u
->state_change_timestamp
;
1915 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
1916 u
->inactive_enter_timestamp
= u
->state_change_timestamp
;
1918 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1919 u
->active_enter_timestamp
= u
->state_change_timestamp
;
1920 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1921 u
->active_exit_timestamp
= u
->state_change_timestamp
;
1924 /* Keep track of failed units */
1925 (void) manager_update_failed_units(u
->manager
, u
, ns
== UNIT_FAILED
);
1927 /* Make sure the cgroup is always removed when we become inactive */
1928 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1929 unit_prune_cgroup(u
);
1931 /* Note that this doesn't apply to RemainAfterExit services exiting
1932 * successfully, since there's no change of state in that case. Which is
1933 * why it is handled in service_set_state() */
1934 if (UNIT_IS_INACTIVE_OR_FAILED(os
) != UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
1937 ec
= unit_get_exec_context(u
);
1938 if (ec
&& exec_context_may_touch_console(ec
)) {
1939 if (UNIT_IS_INACTIVE_OR_FAILED(ns
)) {
1942 if (m
->n_on_console
== 0)
1943 /* unset no_console_output flag, since the console is free */
1944 m
->no_console_output
= false;
1953 if (u
->job
->state
== JOB_WAITING
)
1955 /* So we reached a different state for this
1956 * job. Let's see if we can run it now if it
1957 * failed previously due to EAGAIN. */
1958 job_add_to_run_queue(u
->job
);
1960 /* Let's check whether this state change constitutes a
1961 * finished job, or maybe contradicts a running job and
1962 * hence needs to invalidate jobs. */
1964 switch (u
->job
->type
) {
1967 case JOB_VERIFY_ACTIVE
:
1969 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1970 job_finish_and_invalidate(u
->job
, JOB_DONE
, true, false);
1971 else if (u
->job
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
1974 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1975 job_finish_and_invalidate(u
->job
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
1981 case JOB_RELOAD_OR_START
:
1982 case JOB_TRY_RELOAD
:
1984 if (u
->job
->state
== JOB_RUNNING
) {
1985 if (ns
== UNIT_ACTIVE
)
1986 job_finish_and_invalidate(u
->job
, reload_success
? JOB_DONE
: JOB_FAILED
, true, false);
1987 else if (ns
!= UNIT_ACTIVATING
&& ns
!= UNIT_RELOADING
) {
1990 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1991 job_finish_and_invalidate(u
->job
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
, true, false);
1999 case JOB_TRY_RESTART
:
2001 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
2002 job_finish_and_invalidate(u
->job
, JOB_DONE
, true, false);
2003 else if (u
->job
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
2005 job_finish_and_invalidate(u
->job
, JOB_FAILED
, true, false);
2011 assert_not_reached("Job type unknown");
2017 if (!MANAGER_IS_RELOADING(m
)) {
2019 /* If this state change happened without being
2020 * requested by a job, then let's retroactively start
2021 * or stop dependencies. We skip that step when
2022 * deserializing, since we don't want to create any
2023 * additional jobs just because something is already
2027 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
2028 retroactively_start_dependencies(u
);
2029 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2030 retroactively_stop_dependencies(u
);
2033 /* stop unneeded units regardless if going down was expected or not */
2034 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
2035 check_unneeded_dependencies(u
);
2037 if (ns
!= os
&& ns
== UNIT_FAILED
) {
2038 log_unit_notice(u
, "Unit entered failed state.");
2039 unit_start_on_failure(u
);
2043 /* Some names are special */
2044 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
2046 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
))
2047 /* The bus might have just become available,
2048 * hence try to connect to it, if we aren't
2052 if (u
->type
== UNIT_SERVICE
&&
2053 !UNIT_IS_ACTIVE_OR_RELOADING(os
) &&
2054 !MANAGER_IS_RELOADING(m
)) {
2055 /* Write audit record if we have just finished starting up */
2056 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_START
, true);
2060 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
))
2061 manager_send_unit_plymouth(m
, u
);
2065 /* We don't care about D-Bus here, since we'll get an
2066 * asynchronous notification for it anyway. */
2068 if (u
->type
== UNIT_SERVICE
&&
2069 UNIT_IS_INACTIVE_OR_FAILED(ns
) &&
2070 !UNIT_IS_INACTIVE_OR_FAILED(os
) &&
2071 !MANAGER_IS_RELOADING(m
)) {
2073 /* Hmm, if there was no start record written
2074 * write it now, so that we always have a nice
2077 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_START
, ns
== UNIT_INACTIVE
);
2079 if (ns
== UNIT_INACTIVE
)
2080 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_STOP
, true);
2082 /* Write audit record if we have just finished shutting down */
2083 manager_send_unit_audit(m
, u
, AUDIT_SERVICE_STOP
, ns
== UNIT_INACTIVE
);
2085 u
->in_audit
= false;
2089 manager_recheck_journal(m
);
2090 unit_trigger_notify(u
);
2092 if (!MANAGER_IS_RELOADING(u
->manager
)) {
2093 /* Maybe we finished startup and are now ready for
2094 * being stopped because unneeded? */
2095 unit_check_unneeded(u
);
2097 /* Maybe we finished startup, but something we needed
2098 * has vanished? Let's die then. (This happens when
2099 * something BindsTo= to a Type=oneshot unit, as these
2100 * units go directly from starting to inactive,
2101 * without ever entering started.) */
2102 unit_check_binds_to(u
);
2105 unit_add_to_dbus_queue(u
);
2106 unit_add_to_gc_queue(u
);
2109 int unit_watch_pid(Unit
*u
, pid_t pid
) {
2115 /* Watch a specific PID. We only support one or two units
2116 * watching each PID for now, not more. */
2118 r
= set_ensure_allocated(&u
->pids
, NULL
);
2122 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids1
, NULL
);
2126 r
= hashmap_put(u
->manager
->watch_pids1
, PID_TO_PTR(pid
), u
);
2128 r
= hashmap_ensure_allocated(&u
->manager
->watch_pids2
, NULL
);
2132 r
= hashmap_put(u
->manager
->watch_pids2
, PID_TO_PTR(pid
), u
);
2135 q
= set_put(u
->pids
, PID_TO_PTR(pid
));
2142 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
2146 (void) hashmap_remove_value(u
->manager
->watch_pids1
, PID_TO_PTR(pid
), u
);
2147 (void) hashmap_remove_value(u
->manager
->watch_pids2
, PID_TO_PTR(pid
), u
);
2148 (void) set_remove(u
->pids
, PID_TO_PTR(pid
));
2151 void unit_unwatch_all_pids(Unit
*u
) {
2154 while (!set_isempty(u
->pids
))
2155 unit_unwatch_pid(u
, PTR_TO_PID(set_first(u
->pids
)));
2157 u
->pids
= set_free(u
->pids
);
2160 void unit_tidy_watch_pids(Unit
*u
, pid_t except1
, pid_t except2
) {
2166 /* Cleans dead PIDs from our list */
2168 SET_FOREACH(e
, u
->pids
, i
) {
2169 pid_t pid
= PTR_TO_PID(e
);
2171 if (pid
== except1
|| pid
== except2
)
2174 if (!pid_is_unwaited(pid
))
2175 unit_unwatch_pid(u
, pid
);
2179 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
2181 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
2185 case JOB_VERIFY_ACTIVE
:
2188 /* Note that we don't check unit_can_start() here. That's because .device units and suchlike are not
2189 * startable by us but may appear due to external events, and it thus makes sense to permit enqueing
2194 /* Similar as above. However, perpetual units can never be stopped (neither explicitly nor due to
2195 * external events), hence it makes no sense to permit enqueing such a request either. */
2196 return !u
->perpetual
;
2199 case JOB_TRY_RESTART
:
2200 return unit_can_stop(u
) && unit_can_start(u
);
2203 case JOB_TRY_RELOAD
:
2204 return unit_can_reload(u
);
2206 case JOB_RELOAD_OR_START
:
2207 return unit_can_reload(u
) && unit_can_start(u
);
2210 assert_not_reached("Invalid job type");
2214 static void maybe_warn_about_dependency(Unit
*u
, const char *other
, UnitDependency dependency
) {
2217 /* Only warn about some unit types */
2218 if (!IN_SET(dependency
, UNIT_CONFLICTS
, UNIT_CONFLICTED_BY
, UNIT_BEFORE
, UNIT_AFTER
, UNIT_ON_FAILURE
, UNIT_TRIGGERS
, UNIT_TRIGGERED_BY
))
2221 if (streq_ptr(u
->id
, other
))
2222 log_unit_warning(u
, "Dependency %s=%s dropped", unit_dependency_to_string(dependency
), u
->id
);
2224 log_unit_warning(u
, "Dependency %s=%s dropped, merged into %s", unit_dependency_to_string(dependency
), strna(other
), u
->id
);
2227 int unit_add_dependency(Unit
*u
, UnitDependency d
, Unit
*other
, bool add_reference
) {
2229 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
2230 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
2231 [UNIT_WANTS
] = UNIT_WANTED_BY
,
2232 [UNIT_REQUISITE
] = UNIT_REQUISITE_OF
,
2233 [UNIT_BINDS_TO
] = UNIT_BOUND_BY
,
2234 [UNIT_PART_OF
] = UNIT_CONSISTS_OF
,
2235 [UNIT_REQUIRED_BY
] = UNIT_REQUIRES
,
2236 [UNIT_REQUISITE_OF
] = UNIT_REQUISITE
,
2237 [UNIT_WANTED_BY
] = UNIT_WANTS
,
2238 [UNIT_BOUND_BY
] = UNIT_BINDS_TO
,
2239 [UNIT_CONSISTS_OF
] = UNIT_PART_OF
,
2240 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
2241 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
2242 [UNIT_BEFORE
] = UNIT_AFTER
,
2243 [UNIT_AFTER
] = UNIT_BEFORE
,
2244 [UNIT_ON_FAILURE
] = _UNIT_DEPENDENCY_INVALID
,
2245 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
2246 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
2247 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
2248 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
2249 [UNIT_PROPAGATES_RELOAD_TO
] = UNIT_RELOAD_PROPAGATED_FROM
,
2250 [UNIT_RELOAD_PROPAGATED_FROM
] = UNIT_PROPAGATES_RELOAD_TO
,
2251 [UNIT_JOINS_NAMESPACE_OF
] = UNIT_JOINS_NAMESPACE_OF
,
2253 int r
, q
= 0, v
= 0, w
= 0;
2254 Unit
*orig_u
= u
, *orig_other
= other
;
2257 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
2260 u
= unit_follow_merge(u
);
2261 other
= unit_follow_merge(other
);
2263 /* We won't allow dependencies on ourselves. We will not
2264 * consider them an error however. */
2266 maybe_warn_about_dependency(orig_u
, orig_other
->id
, d
);
2270 if (d
== UNIT_BEFORE
&& other
->type
== UNIT_DEVICE
) {
2271 log_unit_warning(u
, "Dependency Before=%s ignored (.device units cannot be delayed)", other
->id
);
2275 r
= set_ensure_allocated(&u
->dependencies
[d
], NULL
);
2279 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
) {
2280 r
= set_ensure_allocated(&other
->dependencies
[inverse_table
[d
]], NULL
);
2285 if (add_reference
) {
2286 r
= set_ensure_allocated(&u
->dependencies
[UNIT_REFERENCES
], NULL
);
2290 r
= set_ensure_allocated(&other
->dependencies
[UNIT_REFERENCED_BY
], NULL
);
2295 q
= set_put(u
->dependencies
[d
], other
);
2299 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
&& inverse_table
[d
] != d
) {
2300 v
= set_put(other
->dependencies
[inverse_table
[d
]], u
);
2307 if (add_reference
) {
2308 w
= set_put(u
->dependencies
[UNIT_REFERENCES
], other
);
2314 r
= set_put(other
->dependencies
[UNIT_REFERENCED_BY
], u
);
2319 unit_add_to_dbus_queue(u
);
2324 set_remove(u
->dependencies
[d
], other
);
2327 set_remove(other
->dependencies
[inverse_table
[d
]], u
);
2330 set_remove(u
->dependencies
[UNIT_REFERENCES
], other
);
2335 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
) {
2340 r
= unit_add_dependency(u
, d
, other
, add_reference
);
2344 return unit_add_dependency(u
, e
, other
, add_reference
);
2347 static int resolve_template(Unit
*u
, const char *name
, const char*path
, char **buf
, const char **ret
) {
2351 assert(name
|| path
);
2356 name
= basename(path
);
2358 if (!unit_name_is_valid(name
, UNIT_NAME_TEMPLATE
)) {
2365 r
= unit_name_replace_instance(name
, u
->instance
, buf
);
2367 _cleanup_free_
char *i
= NULL
;
2369 r
= unit_name_to_prefix(u
->id
, &i
);
2373 r
= unit_name_replace_instance(name
, i
, buf
);
2382 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, const char *path
, bool add_reference
) {
2383 _cleanup_free_
char *buf
= NULL
;
2388 assert(name
|| path
);
2390 r
= resolve_template(u
, name
, path
, &buf
, &name
);
2394 r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
);
2398 return unit_add_dependency(u
, d
, other
, add_reference
);
2401 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, const char *path
, bool add_reference
) {
2402 _cleanup_free_
char *buf
= NULL
;
2407 assert(name
|| path
);
2409 r
= resolve_template(u
, name
, path
, &buf
, &name
);
2413 r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
);
2417 return unit_add_two_dependencies(u
, d
, e
, other
, add_reference
);
2420 int set_unit_path(const char *p
) {
2421 /* This is mostly for debug purposes */
2422 if (setenv("SYSTEMD_UNIT_PATH", p
, 1) < 0)
2428 char *unit_dbus_path(Unit
*u
) {
2434 return unit_dbus_path_from_name(u
->id
);
2437 char *unit_dbus_path_invocation_id(Unit
*u
) {
2440 if (sd_id128_is_null(u
->invocation_id
))
2443 return unit_dbus_path_from_name(u
->invocation_id_string
);
2446 int unit_set_slice(Unit
*u
, Unit
*slice
) {
2450 /* Sets the unit slice if it has not been set before. Is extra
2451 * careful, to only allow this for units that actually have a
2452 * cgroup context. Also, we don't allow to set this for slices
2453 * (since the parent slice is derived from the name). Make
2454 * sure the unit we set is actually a slice. */
2456 if (!UNIT_HAS_CGROUP_CONTEXT(u
))
2459 if (u
->type
== UNIT_SLICE
)
2462 if (unit_active_state(u
) != UNIT_INACTIVE
)
2465 if (slice
->type
!= UNIT_SLICE
)
2468 if (unit_has_name(u
, SPECIAL_INIT_SCOPE
) &&
2469 !unit_has_name(slice
, SPECIAL_ROOT_SLICE
))
2472 if (UNIT_DEREF(u
->slice
) == slice
)
2475 /* Disallow slice changes if @u is already bound to cgroups */
2476 if (UNIT_ISSET(u
->slice
) && u
->cgroup_realized
)
2479 unit_ref_unset(&u
->slice
);
2480 unit_ref_set(&u
->slice
, slice
);
2484 int unit_set_default_slice(Unit
*u
) {
2485 _cleanup_free_
char *b
= NULL
;
2486 const char *slice_name
;
2492 if (UNIT_ISSET(u
->slice
))
2496 _cleanup_free_
char *prefix
= NULL
, *escaped
= NULL
;
2498 /* Implicitly place all instantiated units in their
2499 * own per-template slice */
2501 r
= unit_name_to_prefix(u
->id
, &prefix
);
2505 /* The prefix is already escaped, but it might include
2506 * "-" which has a special meaning for slice units,
2507 * hence escape it here extra. */
2508 escaped
= unit_name_escape(prefix
);
2512 if (MANAGER_IS_SYSTEM(u
->manager
))
2513 b
= strjoin("system-", escaped
, ".slice");
2515 b
= strappend(escaped
, ".slice");
2522 MANAGER_IS_SYSTEM(u
->manager
) && !unit_has_name(u
, SPECIAL_INIT_SCOPE
)
2523 ? SPECIAL_SYSTEM_SLICE
2524 : SPECIAL_ROOT_SLICE
;
2526 r
= manager_load_unit(u
->manager
, slice_name
, NULL
, NULL
, &slice
);
2530 return unit_set_slice(u
, slice
);
2533 const char *unit_slice_name(Unit
*u
) {
2536 if (!UNIT_ISSET(u
->slice
))
2539 return UNIT_DEREF(u
->slice
)->id
;
2542 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
2543 _cleanup_free_
char *t
= NULL
;
2550 r
= unit_name_change_suffix(u
->id
, type
, &t
);
2553 if (unit_has_name(u
, t
))
2556 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
2557 assert(r
< 0 || *_found
!= u
);
2561 static int signal_name_owner_changed(sd_bus_message
*message
, void *userdata
, sd_bus_error
*error
) {
2562 const char *name
, *old_owner
, *new_owner
;
2569 r
= sd_bus_message_read(message
, "sss", &name
, &old_owner
, &new_owner
);
2571 bus_log_parse_error(r
);
2575 if (UNIT_VTABLE(u
)->bus_name_owner_change
)
2576 UNIT_VTABLE(u
)->bus_name_owner_change(u
, name
, old_owner
, new_owner
);
2581 int unit_install_bus_match(Unit
*u
, sd_bus
*bus
, const char *name
) {
2588 if (u
->match_bus_slot
)
2591 match
= strjoina("type='signal',"
2592 "sender='org.freedesktop.DBus',"
2593 "path='/org/freedesktop/DBus',"
2594 "interface='org.freedesktop.DBus',"
2595 "member='NameOwnerChanged',"
2596 "arg0='", name
, "'");
2598 return sd_bus_add_match(bus
, &u
->match_bus_slot
, match
, signal_name_owner_changed
, u
);
2601 int unit_watch_bus_name(Unit
*u
, const char *name
) {
2607 /* Watch a specific name on the bus. We only support one unit
2608 * watching each name for now. */
2610 if (u
->manager
->api_bus
) {
2611 /* If the bus is already available, install the match directly.
2612 * Otherwise, just put the name in the list. bus_setup_api() will take care later. */
2613 r
= unit_install_bus_match(u
, u
->manager
->api_bus
, name
);
2615 return log_warning_errno(r
, "Failed to subscribe to NameOwnerChanged signal for '%s': %m", name
);
2618 r
= hashmap_put(u
->manager
->watch_bus
, name
, u
);
2620 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
2621 return log_warning_errno(r
, "Failed to put bus name to hashmap: %m");
2627 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
2631 hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
2632 u
->match_bus_slot
= sd_bus_slot_unref(u
->match_bus_slot
);
2635 bool unit_can_serialize(Unit
*u
) {
2638 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
2641 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
, bool serialize_jobs
) {
2648 if (unit_can_serialize(u
)) {
2651 r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
);
2655 rt
= unit_get_exec_runtime(u
);
2657 r
= exec_runtime_serialize(u
, rt
, f
, fds
);
2663 dual_timestamp_serialize(f
, "state-change-timestamp", &u
->state_change_timestamp
);
2665 dual_timestamp_serialize(f
, "inactive-exit-timestamp", &u
->inactive_exit_timestamp
);
2666 dual_timestamp_serialize(f
, "active-enter-timestamp", &u
->active_enter_timestamp
);
2667 dual_timestamp_serialize(f
, "active-exit-timestamp", &u
->active_exit_timestamp
);
2668 dual_timestamp_serialize(f
, "inactive-enter-timestamp", &u
->inactive_enter_timestamp
);
2670 dual_timestamp_serialize(f
, "condition-timestamp", &u
->condition_timestamp
);
2671 dual_timestamp_serialize(f
, "assert-timestamp", &u
->assert_timestamp
);
2673 if (dual_timestamp_is_set(&u
->condition_timestamp
))
2674 unit_serialize_item(u
, f
, "condition-result", yes_no(u
->condition_result
));
2676 if (dual_timestamp_is_set(&u
->assert_timestamp
))
2677 unit_serialize_item(u
, f
, "assert-result", yes_no(u
->assert_result
));
2679 unit_serialize_item(u
, f
, "transient", yes_no(u
->transient
));
2681 unit_serialize_item_format(u
, f
, "cpu-usage-base", "%" PRIu64
, u
->cpu_usage_base
);
2682 if (u
->cpu_usage_last
!= NSEC_INFINITY
)
2683 unit_serialize_item_format(u
, f
, "cpu-usage-last", "%" PRIu64
, u
->cpu_usage_last
);
2686 unit_serialize_item(u
, f
, "cgroup", u
->cgroup_path
);
2687 unit_serialize_item(u
, f
, "cgroup-realized", yes_no(u
->cgroup_realized
));
2689 if (uid_is_valid(u
->ref_uid
))
2690 unit_serialize_item_format(u
, f
, "ref-uid", UID_FMT
, u
->ref_uid
);
2691 if (gid_is_valid(u
->ref_gid
))
2692 unit_serialize_item_format(u
, f
, "ref-gid", GID_FMT
, u
->ref_gid
);
2694 if (!sd_id128_is_null(u
->invocation_id
))
2695 unit_serialize_item_format(u
, f
, "invocation-id", SD_ID128_FORMAT_STR
, SD_ID128_FORMAT_VAL(u
->invocation_id
));
2697 bus_track_serialize(u
->bus_track
, f
, "ref");
2699 if (serialize_jobs
) {
2701 fprintf(f
, "job\n");
2702 job_serialize(u
->job
, f
);
2706 fprintf(f
, "job\n");
2707 job_serialize(u
->nop_job
, f
);
2716 int unit_serialize_item(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
2732 int unit_serialize_item_escaped(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
2733 _cleanup_free_
char *c
= NULL
;
2754 int unit_serialize_item_fd(Unit
*u
, FILE *f
, FDSet
*fds
, const char *key
, int fd
) {
2764 copy
= fdset_put_dup(fds
, fd
);
2768 fprintf(f
, "%s=%i\n", key
, copy
);
2772 void unit_serialize_item_format(Unit
*u
, FILE *f
, const char *key
, const char *format
, ...) {
2783 va_start(ap
, format
);
2784 vfprintf(f
, format
, ap
);
2790 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
2791 ExecRuntime
**rt
= NULL
;
2799 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
2801 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
2804 char line
[LINE_MAX
], *l
, *v
;
2807 if (!fgets(line
, sizeof(line
), f
)) {
2820 k
= strcspn(l
, "=");
2828 if (streq(l
, "job")) {
2830 /* new-style serialized job */
2837 r
= job_deserialize(j
, f
);
2843 r
= hashmap_put(u
->manager
->jobs
, UINT32_TO_PTR(j
->id
), j
);
2849 r
= job_install_deserialized(j
);
2851 hashmap_remove(u
->manager
->jobs
, UINT32_TO_PTR(j
->id
));
2855 } else /* legacy for pre-44 */
2856 log_unit_warning(u
, "Update from too old systemd versions are unsupported, cannot deserialize job: %s", v
);
2858 } else if (streq(l
, "state-change-timestamp")) {
2859 dual_timestamp_deserialize(v
, &u
->state_change_timestamp
);
2861 } else if (streq(l
, "inactive-exit-timestamp")) {
2862 dual_timestamp_deserialize(v
, &u
->inactive_exit_timestamp
);
2864 } else if (streq(l
, "active-enter-timestamp")) {
2865 dual_timestamp_deserialize(v
, &u
->active_enter_timestamp
);
2867 } else if (streq(l
, "active-exit-timestamp")) {
2868 dual_timestamp_deserialize(v
, &u
->active_exit_timestamp
);
2870 } else if (streq(l
, "inactive-enter-timestamp")) {
2871 dual_timestamp_deserialize(v
, &u
->inactive_enter_timestamp
);
2873 } else if (streq(l
, "condition-timestamp")) {
2874 dual_timestamp_deserialize(v
, &u
->condition_timestamp
);
2876 } else if (streq(l
, "assert-timestamp")) {
2877 dual_timestamp_deserialize(v
, &u
->assert_timestamp
);
2879 } else if (streq(l
, "condition-result")) {
2881 r
= parse_boolean(v
);
2883 log_unit_debug(u
, "Failed to parse condition result value %s, ignoring.", v
);
2885 u
->condition_result
= r
;
2889 } else if (streq(l
, "assert-result")) {
2891 r
= parse_boolean(v
);
2893 log_unit_debug(u
, "Failed to parse assert result value %s, ignoring.", v
);
2895 u
->assert_result
= r
;
2899 } else if (streq(l
, "transient")) {
2901 r
= parse_boolean(v
);
2903 log_unit_debug(u
, "Failed to parse transient bool %s, ignoring.", v
);
2909 } else if (STR_IN_SET(l
, "cpu-usage-base", "cpuacct-usage-base")) {
2911 r
= safe_atou64(v
, &u
->cpu_usage_base
);
2913 log_unit_debug(u
, "Failed to parse CPU usage base %s, ignoring.", v
);
2917 } else if (streq(l
, "cpu-usage-last")) {
2919 r
= safe_atou64(v
, &u
->cpu_usage_last
);
2921 log_unit_debug(u
, "Failed to read CPU usage last %s, ignoring.", v
);
2925 } else if (streq(l
, "cgroup")) {
2927 r
= unit_set_cgroup_path(u
, v
);
2929 log_unit_debug_errno(u
, r
, "Failed to set cgroup path %s, ignoring: %m", v
);
2931 (void) unit_watch_cgroup(u
);
2934 } else if (streq(l
, "cgroup-realized")) {
2937 b
= parse_boolean(v
);
2939 log_unit_debug(u
, "Failed to parse cgroup-realized bool %s, ignoring.", v
);
2941 u
->cgroup_realized
= b
;
2945 } else if (streq(l
, "ref-uid")) {
2948 r
= parse_uid(v
, &uid
);
2950 log_unit_debug(u
, "Failed to parse referenced UID %s, ignoring.", v
);
2952 unit_ref_uid_gid(u
, uid
, GID_INVALID
);
2956 } else if (streq(l
, "ref-gid")) {
2959 r
= parse_gid(v
, &gid
);
2961 log_unit_debug(u
, "Failed to parse referenced GID %s, ignoring.", v
);
2963 unit_ref_uid_gid(u
, UID_INVALID
, gid
);
2965 } else if (streq(l
, "ref")) {
2967 r
= strv_extend(&u
->deserialized_refs
, v
);
2972 } else if (streq(l
, "invocation-id")) {
2975 r
= sd_id128_from_string(v
, &id
);
2977 log_unit_debug(u
, "Failed to parse invocation id %s, ignoring.", v
);
2979 r
= unit_set_invocation_id(u
, id
);
2981 log_unit_warning_errno(u
, r
, "Failed to set invocation ID for unit: %m");
2987 if (unit_can_serialize(u
)) {
2989 r
= exec_runtime_deserialize_item(u
, rt
, l
, v
, fds
);
2991 log_unit_warning(u
, "Failed to deserialize runtime parameter '%s', ignoring.", l
);
2995 /* Returns positive if key was handled by the call */
3000 r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
);
3002 log_unit_warning(u
, "Failed to deserialize unit parameter '%s', ignoring.", l
);
3006 /* Versions before 228 did not carry a state change timestamp. In this case, take the current time. This is
3007 * useful, so that timeouts based on this timestamp don't trigger too early, and is in-line with the logic from
3008 * before 228 where the base for timeouts was not persistent across reboots. */
3010 if (!dual_timestamp_is_set(&u
->state_change_timestamp
))
3011 dual_timestamp_get(&u
->state_change_timestamp
);
3016 int unit_add_node_link(Unit
*u
, const char *what
, bool wants
, UnitDependency dep
) {
3018 _cleanup_free_
char *e
= NULL
;
3023 /* Adds in links to the device node that this unit is based on */
3027 if (!is_device_path(what
))
3030 /* When device units aren't supported (such as in a
3031 * container), don't create dependencies on them. */
3032 if (!unit_type_supported(UNIT_DEVICE
))
3035 r
= unit_name_from_path(what
, ".device", &e
);
3039 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
3043 r
= unit_add_two_dependencies(u
, UNIT_AFTER
,
3044 MANAGER_IS_SYSTEM(u
->manager
) ? dep
: UNIT_WANTS
,
3050 r
= unit_add_dependency(device
, UNIT_WANTS
, u
, false);
3058 int unit_coldplug(Unit
*u
) {
3064 /* Make sure we don't enter a loop, when coldplugging
3069 u
->coldplugged
= true;
3071 STRV_FOREACH(i
, u
->deserialized_refs
) {
3072 q
= bus_unit_track_add_name(u
, *i
);
3073 if (q
< 0 && r
>= 0)
3076 u
->deserialized_refs
= strv_free(u
->deserialized_refs
);
3078 if (UNIT_VTABLE(u
)->coldplug
) {
3079 q
= UNIT_VTABLE(u
)->coldplug(u
);
3080 if (q
< 0 && r
>= 0)
3085 q
= job_coldplug(u
->job
);
3086 if (q
< 0 && r
>= 0)
3093 static bool fragment_mtime_newer(const char *path
, usec_t mtime
, bool path_masked
) {
3099 if (stat(path
, &st
) < 0)
3100 /* What, cannot access this anymore? */
3104 /* For masked files check if they are still so */
3105 return !null_or_empty(&st
);
3107 /* For non-empty files check the mtime */
3108 return timespec_load(&st
.st_mtim
) > mtime
;
3113 bool unit_need_daemon_reload(Unit
*u
) {
3114 _cleanup_strv_free_
char **t
= NULL
;
3119 /* For unit files, we allow masking… */
3120 if (fragment_mtime_newer(u
->fragment_path
, u
->fragment_mtime
,
3121 u
->load_state
== UNIT_MASKED
))
3124 /* Source paths should not be masked… */
3125 if (fragment_mtime_newer(u
->source_path
, u
->source_mtime
, false))
3128 (void) unit_find_dropin_paths(u
, &t
);
3129 if (!strv_equal(u
->dropin_paths
, t
))
3132 /* … any drop-ins that are masked are simply omitted from the list. */
3133 STRV_FOREACH(path
, u
->dropin_paths
)
3134 if (fragment_mtime_newer(*path
, u
->dropin_mtime
, false))
3140 void unit_reset_failed(Unit
*u
) {
3143 if (UNIT_VTABLE(u
)->reset_failed
)
3144 UNIT_VTABLE(u
)->reset_failed(u
);
3146 RATELIMIT_RESET(u
->start_limit
);
3147 u
->start_limit_hit
= false;
3150 Unit
*unit_following(Unit
*u
) {
3153 if (UNIT_VTABLE(u
)->following
)
3154 return UNIT_VTABLE(u
)->following(u
);
3159 bool unit_stop_pending(Unit
*u
) {
3162 /* This call does check the current state of the unit. It's
3163 * hence useful to be called from state change calls of the
3164 * unit itself, where the state isn't updated yet. This is
3165 * different from unit_inactive_or_pending() which checks both
3166 * the current state and for a queued job. */
3168 return u
->job
&& u
->job
->type
== JOB_STOP
;
3171 bool unit_inactive_or_pending(Unit
*u
) {
3174 /* Returns true if the unit is inactive or going down */
3176 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
3179 if (unit_stop_pending(u
))
3185 bool unit_active_or_pending(Unit
*u
) {
3188 /* Returns true if the unit is active or going up */
3190 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
3194 (u
->job
->type
== JOB_START
||
3195 u
->job
->type
== JOB_RELOAD_OR_START
||
3196 u
->job
->type
== JOB_RESTART
))
3202 int unit_kill(Unit
*u
, KillWho w
, int signo
, sd_bus_error
*error
) {
3204 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
3205 assert(SIGNAL_VALID(signo
));
3207 if (!UNIT_VTABLE(u
)->kill
)
3210 return UNIT_VTABLE(u
)->kill(u
, w
, signo
, error
);
3213 static Set
*unit_pid_set(pid_t main_pid
, pid_t control_pid
) {
3217 pid_set
= set_new(NULL
);
3221 /* Exclude the main/control pids from being killed via the cgroup */
3223 r
= set_put(pid_set
, PID_TO_PTR(main_pid
));
3228 if (control_pid
> 0) {
3229 r
= set_put(pid_set
, PID_TO_PTR(control_pid
));
3241 int unit_kill_common(
3247 sd_bus_error
*error
) {
3250 bool killed
= false;
3252 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
)) {
3254 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no main processes", unit_type_to_string(u
->type
));
3255 else if (main_pid
== 0)
3256 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No main process to kill");
3259 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
)) {
3260 if (control_pid
< 0)
3261 return sd_bus_error_setf(error
, BUS_ERROR_NO_SUCH_PROCESS
, "%s units have no control processes", unit_type_to_string(u
->type
));
3262 else if (control_pid
== 0)
3263 return sd_bus_error_set_const(error
, BUS_ERROR_NO_SUCH_PROCESS
, "No control process to kill");
3266 if (IN_SET(who
, KILL_CONTROL
, KILL_CONTROL_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3267 if (control_pid
> 0) {
3268 if (kill(control_pid
, signo
) < 0)
3274 if (IN_SET(who
, KILL_MAIN
, KILL_MAIN_FAIL
, KILL_ALL
, KILL_ALL_FAIL
))
3276 if (kill(main_pid
, signo
) < 0)
3282 if (IN_SET(who
, KILL_ALL
, KILL_ALL_FAIL
) && u
->cgroup_path
) {
3283 _cleanup_set_free_ Set
*pid_set
= NULL
;
3286 /* Exclude the main/control pids from being killed via the cgroup */
3287 pid_set
= unit_pid_set(main_pid
, control_pid
);
3291 q
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
, signo
, 0, pid_set
, NULL
, NULL
);
3292 if (q
< 0 && q
!= -EAGAIN
&& q
!= -ESRCH
&& q
!= -ENOENT
)
3298 if (r
== 0 && !killed
&& IN_SET(who
, KILL_ALL_FAIL
, KILL_CONTROL_FAIL
))
3304 int unit_following_set(Unit
*u
, Set
**s
) {
3308 if (UNIT_VTABLE(u
)->following_set
)
3309 return UNIT_VTABLE(u
)->following_set(u
, s
);
3315 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
3320 if (u
->unit_file_state
< 0 && u
->fragment_path
) {
3321 r
= unit_file_get_state(
3322 u
->manager
->unit_file_scope
,
3324 basename(u
->fragment_path
),
3325 &u
->unit_file_state
);
3327 u
->unit_file_state
= UNIT_FILE_BAD
;
3330 return u
->unit_file_state
;
3333 int unit_get_unit_file_preset(Unit
*u
) {
3336 if (u
->unit_file_preset
< 0 && u
->fragment_path
)
3337 u
->unit_file_preset
= unit_file_query_preset(
3338 u
->manager
->unit_file_scope
,
3340 basename(u
->fragment_path
));
3342 return u
->unit_file_preset
;
3345 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*u
) {
3350 unit_ref_unset(ref
);
3353 LIST_PREPEND(refs
, u
->refs
, ref
);
3357 void unit_ref_unset(UnitRef
*ref
) {
3363 /* We are about to drop a reference to the unit, make sure the garbage collection has a look at it as it might
3364 * be unreferenced now. */
3365 unit_add_to_gc_queue(ref
->unit
);
3367 LIST_REMOVE(refs
, ref
->unit
->refs
, ref
);
3371 static int user_from_unit_name(Unit
*u
, char **ret
) {
3373 static const uint8_t hash_key
[] = {
3374 0x58, 0x1a, 0xaf, 0xe6, 0x28, 0x58, 0x4e, 0x96,
3375 0xb4, 0x4e, 0xf5, 0x3b, 0x8c, 0x92, 0x07, 0xec
3378 _cleanup_free_
char *n
= NULL
;
3381 r
= unit_name_to_prefix(u
->id
, &n
);
3385 if (valid_user_group_name(n
)) {
3391 /* If we can't use the unit name as a user name, then let's hash it and use that */
3392 if (asprintf(ret
, "_du%016" PRIx64
, siphash24(n
, strlen(n
), hash_key
)) < 0)
3398 int unit_patch_contexts(Unit
*u
) {
3406 /* Patch in the manager defaults into the exec and cgroup
3407 * contexts, _after_ the rest of the settings have been
3410 ec
= unit_get_exec_context(u
);
3412 /* This only copies in the ones that need memory */
3413 for (i
= 0; i
< _RLIMIT_MAX
; i
++)
3414 if (u
->manager
->rlimit
[i
] && !ec
->rlimit
[i
]) {
3415 ec
->rlimit
[i
] = newdup(struct rlimit
, u
->manager
->rlimit
[i
], 1);
3420 if (MANAGER_IS_USER(u
->manager
) &&
3421 !ec
->working_directory
) {
3423 r
= get_home_dir(&ec
->working_directory
);
3427 /* Allow user services to run, even if the
3428 * home directory is missing */
3429 ec
->working_directory_missing_ok
= true;
3432 if (ec
->private_devices
)
3433 ec
->capability_bounding_set
&= ~((UINT64_C(1) << CAP_MKNOD
) | (UINT64_C(1) << CAP_SYS_RAWIO
));
3435 if (ec
->protect_kernel_modules
)
3436 ec
->capability_bounding_set
&= ~(UINT64_C(1) << CAP_SYS_MODULE
);
3438 if (ec
->dynamic_user
) {
3440 r
= user_from_unit_name(u
, &ec
->user
);
3446 ec
->group
= strdup(ec
->user
);
3451 /* If the dynamic user option is on, let's make sure that the unit can't leave its UID/GID
3452 * around in the file system or on IPC objects. Hence enforce a strict sandbox. */
3454 ec
->private_tmp
= true;
3455 ec
->remove_ipc
= true;
3456 ec
->protect_system
= PROTECT_SYSTEM_STRICT
;
3457 if (ec
->protect_home
== PROTECT_HOME_NO
)
3458 ec
->protect_home
= PROTECT_HOME_READ_ONLY
;
3462 cc
= unit_get_cgroup_context(u
);
3466 ec
->private_devices
&&
3467 cc
->device_policy
== CGROUP_AUTO
)
3468 cc
->device_policy
= CGROUP_CLOSED
;
3474 ExecContext
*unit_get_exec_context(Unit
*u
) {
3481 offset
= UNIT_VTABLE(u
)->exec_context_offset
;
3485 return (ExecContext
*) ((uint8_t*) u
+ offset
);
3488 KillContext
*unit_get_kill_context(Unit
*u
) {
3495 offset
= UNIT_VTABLE(u
)->kill_context_offset
;
3499 return (KillContext
*) ((uint8_t*) u
+ offset
);
3502 CGroupContext
*unit_get_cgroup_context(Unit
*u
) {
3508 offset
= UNIT_VTABLE(u
)->cgroup_context_offset
;
3512 return (CGroupContext
*) ((uint8_t*) u
+ offset
);
3515 ExecRuntime
*unit_get_exec_runtime(Unit
*u
) {
3521 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
3525 return *(ExecRuntime
**) ((uint8_t*) u
+ offset
);
3528 static const char* unit_drop_in_dir(Unit
*u
, UnitSetPropertiesMode mode
) {
3531 if (!IN_SET(mode
, UNIT_RUNTIME
, UNIT_PERSISTENT
))
3534 if (u
->transient
) /* Redirect drop-ins for transient units always into the transient directory. */
3535 return u
->manager
->lookup_paths
.transient
;
3537 if (mode
== UNIT_RUNTIME
)
3538 return u
->manager
->lookup_paths
.runtime_control
;
3540 if (mode
== UNIT_PERSISTENT
)
3541 return u
->manager
->lookup_paths
.persistent_control
;
3546 int unit_write_drop_in(Unit
*u
, UnitSetPropertiesMode mode
, const char *name
, const char *data
) {
3547 _cleanup_free_
char *p
= NULL
, *q
= NULL
;
3548 const char *dir
, *wrapped
;
3553 if (u
->transient_file
) {
3554 /* When this is a transient unit file in creation, then let's not create a new drop-in but instead
3555 * write to the transient unit file. */
3556 fputs(data
, u
->transient_file
);
3557 fputc('\n', u
->transient_file
);
3561 if (!IN_SET(mode
, UNIT_PERSISTENT
, UNIT_RUNTIME
))
3564 dir
= unit_drop_in_dir(u
, mode
);
3568 wrapped
= strjoina("# This is a drop-in unit file extension, created via \"systemctl set-property\"\n"
3569 "# or an equivalent operation. Do not edit.\n",
3573 r
= drop_in_file(dir
, u
->id
, 50, name
, &p
, &q
);
3577 (void) mkdir_p(p
, 0755);
3578 r
= write_string_file_atomic_label(q
, wrapped
);
3582 r
= strv_push(&u
->dropin_paths
, q
);
3587 strv_uniq(u
->dropin_paths
);
3589 u
->dropin_mtime
= now(CLOCK_REALTIME
);
3594 int unit_write_drop_in_format(Unit
*u
, UnitSetPropertiesMode mode
, const char *name
, const char *format
, ...) {
3595 _cleanup_free_
char *p
= NULL
;
3603 if (!IN_SET(mode
, UNIT_PERSISTENT
, UNIT_RUNTIME
))
3606 va_start(ap
, format
);
3607 r
= vasprintf(&p
, format
, ap
);
3613 return unit_write_drop_in(u
, mode
, name
, p
);
3616 int unit_write_drop_in_private(Unit
*u
, UnitSetPropertiesMode mode
, const char *name
, const char *data
) {
3623 if (!UNIT_VTABLE(u
)->private_section
)
3626 if (!IN_SET(mode
, UNIT_PERSISTENT
, UNIT_RUNTIME
))
3629 ndata
= strjoina("[", UNIT_VTABLE(u
)->private_section
, "]\n", data
);
3631 return unit_write_drop_in(u
, mode
, name
, ndata
);
3634 int unit_write_drop_in_private_format(Unit
*u
, UnitSetPropertiesMode mode
, const char *name
, const char *format
, ...) {
3635 _cleanup_free_
char *p
= NULL
;
3643 if (!IN_SET(mode
, UNIT_PERSISTENT
, UNIT_RUNTIME
))
3646 va_start(ap
, format
);
3647 r
= vasprintf(&p
, format
, ap
);
3653 return unit_write_drop_in_private(u
, mode
, name
, p
);
3656 int unit_make_transient(Unit
*u
) {
3662 if (!UNIT_VTABLE(u
)->can_transient
)
3665 path
= strjoin(u
->manager
->lookup_paths
.transient
, "/", u
->id
);
3669 /* Let's open the file we'll write the transient settings into. This file is kept open as long as we are
3670 * creating the transient, and is closed in unit_load(), as soon as we start loading the file. */
3672 RUN_WITH_UMASK(0022) {
3673 f
= fopen(path
, "we");
3680 if (u
->transient_file
)
3681 fclose(u
->transient_file
);
3682 u
->transient_file
= f
;
3684 free(u
->fragment_path
);
3685 u
->fragment_path
= path
;
3687 u
->source_path
= mfree(u
->source_path
);
3688 u
->dropin_paths
= strv_free(u
->dropin_paths
);
3689 u
->fragment_mtime
= u
->source_mtime
= u
->dropin_mtime
= 0;
3691 u
->load_state
= UNIT_STUB
;
3693 u
->transient
= true;
3695 unit_add_to_dbus_queue(u
);
3696 unit_add_to_gc_queue(u
);
3698 fputs("# This is a transient unit file, created programmatically via the systemd API. Do not edit.\n",
3704 static void log_kill(pid_t pid
, int sig
, void *userdata
) {
3705 _cleanup_free_
char *comm
= NULL
;
3707 (void) get_process_comm(pid
, &comm
);
3709 /* Don't log about processes marked with brackets, under the assumption that these are temporary processes
3710 only, like for example systemd's own PAM stub process. */
3711 if (comm
&& comm
[0] == '(')
3714 log_unit_notice(userdata
,
3715 "Killing process " PID_FMT
" (%s) with signal SIG%s.",
3718 signal_to_string(sig
));
3721 static int operation_to_signal(KillContext
*c
, KillOperation k
) {
3726 case KILL_TERMINATE
:
3727 case KILL_TERMINATE_AND_LOG
:
3728 return c
->kill_signal
;
3737 assert_not_reached("KillOperation unknown");
3741 int unit_kill_context(
3747 bool main_pid_alien
) {
3749 bool wait_for_exit
= false, send_sighup
;
3750 cg_kill_log_func_t log_func
;
3756 /* Kill the processes belonging to this unit, in preparation for shutting the unit down. Returns > 0 if we
3757 * killed something worth waiting for, 0 otherwise. */
3759 if (c
->kill_mode
== KILL_NONE
)
3762 sig
= operation_to_signal(c
, k
);
3766 IN_SET(k
, KILL_TERMINATE
, KILL_TERMINATE_AND_LOG
) &&
3770 k
!= KILL_TERMINATE
||
3771 IN_SET(sig
, SIGKILL
, SIGABRT
) ? log_kill
: NULL
;
3775 log_func(main_pid
, sig
, u
);
3777 r
= kill_and_sigcont(main_pid
, sig
);
3778 if (r
< 0 && r
!= -ESRCH
) {
3779 _cleanup_free_
char *comm
= NULL
;
3780 (void) get_process_comm(main_pid
, &comm
);
3782 log_unit_warning_errno(u
, r
, "Failed to kill main process " PID_FMT
" (%s), ignoring: %m", main_pid
, strna(comm
));
3784 if (!main_pid_alien
)
3785 wait_for_exit
= true;
3787 if (r
!= -ESRCH
&& send_sighup
)
3788 (void) kill(main_pid
, SIGHUP
);
3792 if (control_pid
> 0) {
3794 log_func(control_pid
, sig
, u
);
3796 r
= kill_and_sigcont(control_pid
, sig
);
3797 if (r
< 0 && r
!= -ESRCH
) {
3798 _cleanup_free_
char *comm
= NULL
;
3799 (void) get_process_comm(control_pid
, &comm
);
3801 log_unit_warning_errno(u
, r
, "Failed to kill control process " PID_FMT
" (%s), ignoring: %m", control_pid
, strna(comm
));
3803 wait_for_exit
= true;
3805 if (r
!= -ESRCH
&& send_sighup
)
3806 (void) kill(control_pid
, SIGHUP
);
3810 if (u
->cgroup_path
&&
3811 (c
->kill_mode
== KILL_CONTROL_GROUP
|| (c
->kill_mode
== KILL_MIXED
&& k
== KILL_KILL
))) {
3812 _cleanup_set_free_ Set
*pid_set
= NULL
;
3814 /* Exclude the main/control pids from being killed via the cgroup */
3815 pid_set
= unit_pid_set(main_pid
, control_pid
);
3819 r
= cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
3821 CGROUP_SIGCONT
|CGROUP_IGNORE_SELF
,
3825 if (r
!= -EAGAIN
&& r
!= -ESRCH
&& r
!= -ENOENT
)
3826 log_unit_warning_errno(u
, r
, "Failed to kill control group %s, ignoring: %m", u
->cgroup_path
);
3830 /* FIXME: For now, on the legacy hierarchy, we
3831 * will not wait for the cgroup members to die
3832 * if we are running in a container or if this
3833 * is a delegation unit, simply because cgroup
3834 * notification is unreliable in these
3835 * cases. It doesn't work at all in
3836 * containers, and outside of containers it
3837 * can be confused easily by left-over
3838 * directories in the cgroup — which however
3839 * should not exist in non-delegated units. On
3840 * the unified hierarchy that's different,
3841 * there we get proper events. Hence rely on
3844 if (cg_unified(SYSTEMD_CGROUP_CONTROLLER
) > 0 ||
3845 (detect_container() == 0 && !unit_cgroup_delegate(u
)))
3846 wait_for_exit
= true;
3851 pid_set
= unit_pid_set(main_pid
, control_pid
);
3855 cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER
, u
->cgroup_path
,
3864 return wait_for_exit
;
3867 int unit_require_mounts_for(Unit
*u
, const char *path
) {
3868 char prefix
[strlen(path
) + 1], *p
;
3874 /* Registers a unit for requiring a certain path and all its
3875 * prefixes. We keep a simple array of these paths in the
3876 * unit, since its usually short. However, we build a prefix
3877 * table for all possible prefixes so that new appearing mount
3878 * units can easily determine which units to make themselves a
3881 if (!path_is_absolute(path
))
3888 path_kill_slashes(p
);
3890 if (!path_is_safe(p
)) {
3895 if (strv_contains(u
->requires_mounts_for
, p
)) {
3900 r
= strv_consume(&u
->requires_mounts_for
, p
);
3904 PATH_FOREACH_PREFIX_MORE(prefix
, p
) {
3907 x
= hashmap_get(u
->manager
->units_requiring_mounts_for
, prefix
);
3911 r
= hashmap_ensure_allocated(&u
->manager
->units_requiring_mounts_for
, &string_hash_ops
);
3925 r
= hashmap_put(u
->manager
->units_requiring_mounts_for
, q
, x
);
3941 int unit_setup_exec_runtime(Unit
*u
) {
3947 offset
= UNIT_VTABLE(u
)->exec_runtime_offset
;
3950 /* Check if there already is an ExecRuntime for this unit? */
3951 rt
= (ExecRuntime
**) ((uint8_t*) u
+ offset
);
3955 /* Try to get it from somebody else */
3956 SET_FOREACH(other
, u
->dependencies
[UNIT_JOINS_NAMESPACE_OF
], i
) {
3958 *rt
= unit_get_exec_runtime(other
);
3960 exec_runtime_ref(*rt
);
3965 return exec_runtime_make(rt
, unit_get_exec_context(u
), u
->id
);
3968 int unit_setup_dynamic_creds(Unit
*u
) {
3970 DynamicCreds
*dcreds
;
3975 offset
= UNIT_VTABLE(u
)->dynamic_creds_offset
;
3977 dcreds
= (DynamicCreds
*) ((uint8_t*) u
+ offset
);
3979 ec
= unit_get_exec_context(u
);
3982 if (!ec
->dynamic_user
)
3985 return dynamic_creds_acquire(dcreds
, u
->manager
, ec
->user
, ec
->group
);
3988 bool unit_type_supported(UnitType t
) {
3989 if (_unlikely_(t
< 0))
3991 if (_unlikely_(t
>= _UNIT_TYPE_MAX
))
3994 if (!unit_vtable
[t
]->supported
)
3997 return unit_vtable
[t
]->supported();
4000 void unit_warn_if_dir_nonempty(Unit
*u
, const char* where
) {
4006 r
= dir_is_empty(where
);
4010 log_unit_warning_errno(u
, r
, "Failed to check directory %s: %m", where
);
4014 log_struct(LOG_NOTICE
,
4015 LOG_MESSAGE_ID(SD_MESSAGE_OVERMOUNTING
),
4017 LOG_UNIT_MESSAGE(u
, "Directory %s to mount over is not empty, mounting anyway.", where
),
4022 int unit_fail_if_symlink(Unit
*u
, const char* where
) {
4028 r
= is_symlink(where
);
4030 log_unit_debug_errno(u
, r
, "Failed to check symlink %s, ignoring: %m", where
);
4037 LOG_MESSAGE_ID(SD_MESSAGE_OVERMOUNTING
),
4039 LOG_UNIT_MESSAGE(u
, "Mount on symlink %s not allowed.", where
),
4046 bool unit_is_pristine(Unit
*u
) {
4049 /* Check if the unit already exists or is already around,
4050 * in a number of different ways. Note that to cater for unit
4051 * types such as slice, we are generally fine with units that
4052 * are marked UNIT_LOADED even though nothing was
4053 * actually loaded, as those unit types don't require a file
4054 * on disk to validly load. */
4056 return !(!IN_SET(u
->load_state
, UNIT_NOT_FOUND
, UNIT_LOADED
) ||
4059 !strv_isempty(u
->dropin_paths
) ||
4064 pid_t
unit_control_pid(Unit
*u
) {
4067 if (UNIT_VTABLE(u
)->control_pid
)
4068 return UNIT_VTABLE(u
)->control_pid(u
);
4073 pid_t
unit_main_pid(Unit
*u
) {
4076 if (UNIT_VTABLE(u
)->main_pid
)
4077 return UNIT_VTABLE(u
)->main_pid(u
);
4082 static void unit_unref_uid_internal(
4086 void (*_manager_unref_uid
)(Manager
*m
, uid_t uid
, bool destroy_now
)) {
4090 assert(_manager_unref_uid
);
4092 /* Generic implementation of both unit_unref_uid() and unit_unref_gid(), under the assumption that uid_t and
4093 * gid_t are actually the same time, with the same validity rules.
4095 * Drops a reference to UID/GID from a unit. */
4097 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4098 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4100 if (!uid_is_valid(*ref_uid
))
4103 _manager_unref_uid(u
->manager
, *ref_uid
, destroy_now
);
4104 *ref_uid
= UID_INVALID
;
4107 void unit_unref_uid(Unit
*u
, bool destroy_now
) {
4108 unit_unref_uid_internal(u
, &u
->ref_uid
, destroy_now
, manager_unref_uid
);
4111 void unit_unref_gid(Unit
*u
, bool destroy_now
) {
4112 unit_unref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, destroy_now
, manager_unref_gid
);
4115 static int unit_ref_uid_internal(
4120 int (*_manager_ref_uid
)(Manager
*m
, uid_t uid
, bool clean_ipc
)) {
4126 assert(uid_is_valid(uid
));
4127 assert(_manager_ref_uid
);
4129 /* Generic implementation of both unit_ref_uid() and unit_ref_guid(), under the assumption that uid_t and gid_t
4130 * are actually the same type, and have the same validity rules.
4132 * Adds a reference on a specific UID/GID to this unit. Each unit referencing the same UID/GID maintains a
4133 * reference so that we can destroy the UID/GID's IPC resources as soon as this is requested and the counter
4136 assert_cc(sizeof(uid_t
) == sizeof(gid_t
));
4137 assert_cc(UID_INVALID
== (uid_t
) GID_INVALID
);
4139 if (*ref_uid
== uid
)
4142 if (uid_is_valid(*ref_uid
)) /* Already set? */
4145 r
= _manager_ref_uid(u
->manager
, uid
, clean_ipc
);
4153 int unit_ref_uid(Unit
*u
, uid_t uid
, bool clean_ipc
) {
4154 return unit_ref_uid_internal(u
, &u
->ref_uid
, uid
, clean_ipc
, manager_ref_uid
);
4157 int unit_ref_gid(Unit
*u
, gid_t gid
, bool clean_ipc
) {
4158 return unit_ref_uid_internal(u
, (uid_t
*) &u
->ref_gid
, (uid_t
) gid
, clean_ipc
, manager_ref_gid
);
4161 static int unit_ref_uid_gid_internal(Unit
*u
, uid_t uid
, gid_t gid
, bool clean_ipc
) {
4166 /* Reference both a UID and a GID in one go. Either references both, or neither. */
4168 if (uid_is_valid(uid
)) {
4169 r
= unit_ref_uid(u
, uid
, clean_ipc
);
4174 if (gid_is_valid(gid
)) {
4175 q
= unit_ref_gid(u
, gid
, clean_ipc
);
4178 unit_unref_uid(u
, false);
4184 return r
> 0 || q
> 0;
4187 int unit_ref_uid_gid(Unit
*u
, uid_t uid
, gid_t gid
) {
4193 c
= unit_get_exec_context(u
);
4195 r
= unit_ref_uid_gid_internal(u
, uid
, gid
, c
? c
->remove_ipc
: false);
4197 return log_unit_warning_errno(u
, r
, "Couldn't add UID/GID reference to unit, proceeding without: %m");
4202 void unit_unref_uid_gid(Unit
*u
, bool destroy_now
) {
4205 unit_unref_uid(u
, destroy_now
);
4206 unit_unref_gid(u
, destroy_now
);
4209 void unit_notify_user_lookup(Unit
*u
, uid_t uid
, gid_t gid
) {
4214 /* This is invoked whenever one of the forked off processes let's us know the UID/GID its user name/group names
4215 * resolved to. We keep track of which UID/GID is currently assigned in order to be able to destroy its IPC
4216 * objects when no service references the UID/GID anymore. */
4218 r
= unit_ref_uid_gid(u
, uid
, gid
);
4220 bus_unit_send_change_signal(u
);
4223 int unit_set_invocation_id(Unit
*u
, sd_id128_t id
) {
4228 /* Set the invocation ID for this unit. If we cannot, this will not roll back, but reset the whole thing. */
4230 if (sd_id128_equal(u
->invocation_id
, id
))
4233 if (!sd_id128_is_null(u
->invocation_id
))
4234 (void) hashmap_remove_value(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4236 if (sd_id128_is_null(id
)) {
4241 r
= hashmap_ensure_allocated(&u
->manager
->units_by_invocation_id
, &id128_hash_ops
);
4245 u
->invocation_id
= id
;
4246 sd_id128_to_string(id
, u
->invocation_id_string
);
4248 r
= hashmap_put(u
->manager
->units_by_invocation_id
, &u
->invocation_id
, u
);
4255 u
->invocation_id
= SD_ID128_NULL
;
4256 u
->invocation_id_string
[0] = 0;
4260 int unit_acquire_invocation_id(Unit
*u
) {
4266 r
= sd_id128_randomize(&id
);
4268 return log_unit_error_errno(u
, r
, "Failed to generate invocation ID for unit: %m");
4270 r
= unit_set_invocation_id(u
, id
);
4272 return log_unit_error_errno(u
, r
, "Failed to set invocation ID for unit: %m");