1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/epoll.h>
26 #include <sys/timerfd.h>
36 #include "load-fragment.h"
37 #include "load-dropin.h"
39 #include "unit-name.h"
40 #include "specifier.h"
41 #include "dbus-unit.h"
43 #include "cgroup-util.h"
45 #include "cgroup-attr.h"
47 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
48 [UNIT_SERVICE
] = &service_vtable
,
49 [UNIT_TIMER
] = &timer_vtable
,
50 [UNIT_SOCKET
] = &socket_vtable
,
51 [UNIT_TARGET
] = &target_vtable
,
52 [UNIT_DEVICE
] = &device_vtable
,
53 [UNIT_MOUNT
] = &mount_vtable
,
54 [UNIT_AUTOMOUNT
] = &automount_vtable
,
55 [UNIT_SNAPSHOT
] = &snapshot_vtable
,
56 [UNIT_SWAP
] = &swap_vtable
,
57 [UNIT_PATH
] = &path_vtable
60 Unit
*unit_new(Manager
*m
, size_t size
) {
64 assert(size
>= sizeof(Unit
));
70 u
->names
= set_new(string_hash_func
, string_compare_func
);
77 u
->type
= _UNIT_TYPE_INVALID
;
78 u
->deserialized_job
= _JOB_TYPE_INVALID
;
79 u
->default_dependencies
= true;
80 u
->unit_file_state
= _UNIT_FILE_STATE_INVALID
;
85 bool unit_has_name(Unit
*u
, const char *name
) {
89 return !!set_get(u
->names
, (char*) name
);
92 int unit_add_name(Unit
*u
, const char *text
) {
100 if (unit_name_is_template(text
)) {
104 s
= unit_name_replace_instance(text
, u
->instance
);
111 if (!unit_name_is_valid(s
, false)) {
116 assert_se((t
= unit_name_to_type(s
)) >= 0);
118 if (u
->type
!= _UNIT_TYPE_INVALID
&& t
!= u
->type
) {
123 if ((r
= unit_name_to_instance(s
, &i
)) < 0)
126 if (i
&& unit_vtable
[t
]->no_instances
) {
131 /* Ensure that this unit is either instanced or not instanced,
133 if (u
->type
!= _UNIT_TYPE_INVALID
&& !u
->instance
!= !i
) {
138 if (unit_vtable
[t
]->no_alias
&&
139 !set_isempty(u
->names
) &&
140 !set_get(u
->names
, s
)) {
145 if (hashmap_size(u
->manager
->units
) >= MANAGER_MAX_NAMES
) {
150 if ((r
= set_put(u
->names
, s
)) < 0) {
156 if ((r
= hashmap_put(u
->manager
->units
, s
, u
)) < 0) {
157 set_remove(u
->names
, s
);
161 if (u
->type
== _UNIT_TYPE_INVALID
) {
167 LIST_PREPEND(Unit
, units_by_type
, u
->manager
->units_by_type
[t
], u
);
169 if (UNIT_VTABLE(u
)->init
)
170 UNIT_VTABLE(u
)->init(u
);
174 unit_add_to_dbus_queue(u
);
184 int unit_choose_id(Unit
*u
, const char *name
) {
185 char *s
, *t
= NULL
, *i
;
191 if (unit_name_is_template(name
)) {
196 if (!(t
= unit_name_replace_instance(name
, u
->instance
)))
202 /* Selects one of the names of this unit as the id */
203 s
= set_get(u
->names
, (char*) name
);
209 if ((r
= unit_name_to_instance(s
, &i
)) < 0)
217 unit_add_to_dbus_queue(u
);
222 int unit_set_description(Unit
*u
, const char *description
) {
227 if (!(s
= strdup(description
)))
230 free(u
->description
);
233 unit_add_to_dbus_queue(u
);
237 bool unit_check_gc(Unit
*u
) {
240 if (u
->load_state
== UNIT_STUB
)
243 if (UNIT_VTABLE(u
)->no_gc
)
252 if (unit_active_state(u
) != UNIT_INACTIVE
)
255 if (UNIT_VTABLE(u
)->check_gc
)
256 if (UNIT_VTABLE(u
)->check_gc(u
))
262 void unit_add_to_load_queue(Unit
*u
) {
264 assert(u
->type
!= _UNIT_TYPE_INVALID
);
266 if (u
->load_state
!= UNIT_STUB
|| u
->in_load_queue
)
269 LIST_PREPEND(Unit
, load_queue
, u
->manager
->load_queue
, u
);
270 u
->in_load_queue
= true;
273 void unit_add_to_cleanup_queue(Unit
*u
) {
276 if (u
->in_cleanup_queue
)
279 LIST_PREPEND(Unit
, cleanup_queue
, u
->manager
->cleanup_queue
, u
);
280 u
->in_cleanup_queue
= true;
283 void unit_add_to_gc_queue(Unit
*u
) {
286 if (u
->in_gc_queue
|| u
->in_cleanup_queue
)
289 if (unit_check_gc(u
))
292 LIST_PREPEND(Unit
, gc_queue
, u
->manager
->gc_queue
, u
);
293 u
->in_gc_queue
= true;
295 u
->manager
->n_in_gc_queue
++;
297 if (u
->manager
->gc_queue_timestamp
<= 0)
298 u
->manager
->gc_queue_timestamp
= now(CLOCK_MONOTONIC
);
301 void unit_add_to_dbus_queue(Unit
*u
) {
303 assert(u
->type
!= _UNIT_TYPE_INVALID
);
305 if (u
->load_state
== UNIT_STUB
|| u
->in_dbus_queue
)
308 /* Shortcut things if nobody cares */
309 if (!bus_has_subscriber(u
->manager
)) {
310 u
->sent_dbus_new_signal
= true;
314 LIST_PREPEND(Unit
, dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
315 u
->in_dbus_queue
= true;
318 static void bidi_set_free(Unit
*u
, Set
*s
) {
324 /* Frees the set and makes sure we are dropped from the
325 * inverse pointers */
327 SET_FOREACH(other
, s
, i
) {
330 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
331 set_remove(other
->dependencies
[d
], u
);
333 unit_add_to_gc_queue(other
);
339 void unit_free(Unit
*u
) {
346 bus_unit_send_removed_signal(u
);
348 if (u
->load_state
!= UNIT_STUB
)
349 if (UNIT_VTABLE(u
)->done
)
350 UNIT_VTABLE(u
)->done(u
);
352 SET_FOREACH(t
, u
->names
, i
)
353 hashmap_remove_value(u
->manager
->units
, t
, u
);
358 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
359 bidi_set_free(u
, u
->dependencies
[d
]);
361 if (u
->type
!= _UNIT_TYPE_INVALID
)
362 LIST_REMOVE(Unit
, units_by_type
, u
->manager
->units_by_type
[u
->type
], u
);
364 if (u
->in_load_queue
)
365 LIST_REMOVE(Unit
, load_queue
, u
->manager
->load_queue
, u
);
367 if (u
->in_dbus_queue
)
368 LIST_REMOVE(Unit
, dbus_queue
, u
->manager
->dbus_unit_queue
, u
);
370 if (u
->in_cleanup_queue
)
371 LIST_REMOVE(Unit
, cleanup_queue
, u
->manager
->cleanup_queue
, u
);
373 if (u
->in_gc_queue
) {
374 LIST_REMOVE(Unit
, gc_queue
, u
->manager
->gc_queue
, u
);
375 u
->manager
->n_in_gc_queue
--;
378 cgroup_bonding_free_list(u
->cgroup_bondings
, u
->manager
->n_reloading
<= 0);
379 cgroup_attribute_free_list(u
->cgroup_attributes
);
381 free(u
->description
);
382 free(u
->fragment_path
);
385 set_free_free(u
->names
);
387 condition_free_list(u
->conditions
);
390 unit_ref_unset(u
->refs
);
395 UnitActiveState
unit_active_state(Unit
*u
) {
398 if (u
->load_state
== UNIT_MERGED
)
399 return unit_active_state(unit_follow_merge(u
));
401 /* After a reload it might happen that a unit is not correctly
402 * loaded but still has a process around. That's why we won't
403 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
405 return UNIT_VTABLE(u
)->active_state(u
);
408 const char* unit_sub_state_to_string(Unit
*u
) {
411 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
414 static void complete_move(Set
**s
, Set
**other
) {
422 set_move(*s
, *other
);
429 static void merge_names(Unit
*u
, Unit
*other
) {
436 complete_move(&u
->names
, &other
->names
);
438 set_free_free(other
->names
);
442 SET_FOREACH(t
, u
->names
, i
)
443 assert_se(hashmap_replace(u
->manager
->units
, t
, u
) == 0);
446 static void merge_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
453 assert(d
< _UNIT_DEPENDENCY_MAX
);
455 /* Fix backwards pointers */
456 SET_FOREACH(back
, other
->dependencies
[d
], i
) {
459 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++)
460 if ((r
= set_remove_and_put(back
->dependencies
[k
], other
, u
)) < 0) {
463 set_remove(back
->dependencies
[k
], other
);
465 assert(r
== -ENOENT
);
469 complete_move(&u
->dependencies
[d
], &other
->dependencies
[d
]);
471 set_free(other
->dependencies
[d
]);
472 other
->dependencies
[d
] = NULL
;
475 int unit_merge(Unit
*u
, Unit
*other
) {
480 assert(u
->manager
== other
->manager
);
481 assert(u
->type
!= _UNIT_TYPE_INVALID
);
483 other
= unit_follow_merge(other
);
488 if (u
->type
!= other
->type
)
491 if (!u
->instance
!= !other
->instance
)
494 if (other
->load_state
!= UNIT_STUB
&&
495 other
->load_state
!= UNIT_ERROR
)
501 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
505 merge_names(u
, other
);
507 /* Redirect all references */
509 unit_ref_set(other
->refs
, u
);
511 /* Merge dependencies */
512 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
513 merge_dependencies(u
, other
, d
);
515 other
->load_state
= UNIT_MERGED
;
516 other
->merged_into
= u
;
518 /* If there is still some data attached to the other node, we
519 * don't need it anymore, and can free it. */
520 if (other
->load_state
!= UNIT_STUB
)
521 if (UNIT_VTABLE(other
)->done
)
522 UNIT_VTABLE(other
)->done(other
);
524 unit_add_to_dbus_queue(u
);
525 unit_add_to_cleanup_queue(other
);
530 int unit_merge_by_name(Unit
*u
, const char *name
) {
538 if (unit_name_is_template(name
)) {
542 if (!(s
= unit_name_replace_instance(name
, u
->instance
)))
548 if (!(other
= manager_get_unit(u
->manager
, name
)))
549 r
= unit_add_name(u
, name
);
551 r
= unit_merge(u
, other
);
557 Unit
* unit_follow_merge(Unit
*u
) {
560 while (u
->load_state
== UNIT_MERGED
)
561 assert_se(u
= u
->merged_into
);
566 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
572 if (c
->std_output
!= EXEC_OUTPUT_KMSG
&&
573 c
->std_output
!= EXEC_OUTPUT_SYSLOG
&&
574 c
->std_output
!= EXEC_OUTPUT_JOURNAL
&&
575 c
->std_output
!= EXEC_OUTPUT_KMSG_AND_CONSOLE
&&
576 c
->std_output
!= EXEC_OUTPUT_SYSLOG_AND_CONSOLE
&&
577 c
->std_output
!= EXEC_OUTPUT_JOURNAL_AND_CONSOLE
&&
578 c
->std_error
!= EXEC_OUTPUT_KMSG
&&
579 c
->std_error
!= EXEC_OUTPUT_SYSLOG
&&
580 c
->std_error
!= EXEC_OUTPUT_JOURNAL
&&
581 c
->std_error
!= EXEC_OUTPUT_KMSG_AND_CONSOLE
&&
582 c
->std_error
!= EXEC_OUTPUT_JOURNAL_AND_CONSOLE
&&
583 c
->std_error
!= EXEC_OUTPUT_SYSLOG_AND_CONSOLE
)
586 /* If syslog or kernel logging is requested, make sure our own
587 * logging daemon is run first. */
589 if (u
->manager
->running_as
== MANAGER_SYSTEM
)
590 if ((r
= unit_add_two_dependencies_by_name(u
, UNIT_REQUIRES
, UNIT_AFTER
, SPECIAL_JOURNALD_SOCKET
, NULL
, true)) < 0)
596 const char *unit_description(Unit
*u
) {
600 return u
->description
;
605 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
612 timestamp1
[FORMAT_TIMESTAMP_MAX
],
613 timestamp2
[FORMAT_TIMESTAMP_MAX
],
614 timestamp3
[FORMAT_TIMESTAMP_MAX
],
615 timestamp4
[FORMAT_TIMESTAMP_MAX
],
616 timespan
[FORMAT_TIMESPAN_MAX
];
620 assert(u
->type
>= 0);
624 p2
= strappend(prefix
, "\t");
625 prefix2
= p2
? p2
: prefix
;
629 "%s\tDescription: %s\n"
631 "%s\tUnit Load State: %s\n"
632 "%s\tUnit Active State: %s\n"
633 "%s\tInactive Exit Timestamp: %s\n"
634 "%s\tActive Enter Timestamp: %s\n"
635 "%s\tActive Exit Timestamp: %s\n"
636 "%s\tInactive Enter Timestamp: %s\n"
637 "%s\tGC Check Good: %s\n"
638 "%s\tNeed Daemon Reload: %s\n",
640 prefix
, unit_description(u
),
641 prefix
, strna(u
->instance
),
642 prefix
, unit_load_state_to_string(u
->load_state
),
643 prefix
, unit_active_state_to_string(unit_active_state(u
)),
644 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->inactive_exit_timestamp
.realtime
)),
645 prefix
, strna(format_timestamp(timestamp2
, sizeof(timestamp2
), u
->active_enter_timestamp
.realtime
)),
646 prefix
, strna(format_timestamp(timestamp3
, sizeof(timestamp3
), u
->active_exit_timestamp
.realtime
)),
647 prefix
, strna(format_timestamp(timestamp4
, sizeof(timestamp4
), u
->inactive_enter_timestamp
.realtime
)),
648 prefix
, yes_no(unit_check_gc(u
)),
649 prefix
, yes_no(unit_need_daemon_reload(u
)));
651 SET_FOREACH(t
, u
->names
, i
)
652 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
654 if ((following
= unit_following(u
)))
655 fprintf(f
, "%s\tFollowing: %s\n", prefix
, following
->id
);
657 if (u
->fragment_path
)
658 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->fragment_path
);
660 if (u
->job_timeout
> 0)
661 fprintf(f
, "%s\tJob Timeout: %s\n", prefix
, format_timespan(timespan
, sizeof(timespan
), u
->job_timeout
));
663 condition_dump_list(u
->conditions
, f
, prefix
);
665 if (dual_timestamp_is_set(&u
->condition_timestamp
))
667 "%s\tCondition Timestamp: %s\n"
668 "%s\tCondition Result: %s\n",
669 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->condition_timestamp
.realtime
)),
670 prefix
, yes_no(u
->condition_result
));
672 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
675 SET_FOREACH(other
, u
->dependencies
[d
], i
)
676 fprintf(f
, "%s\t%s: %s\n", prefix
, unit_dependency_to_string(d
), other
->id
);
679 if (u
->load_state
== UNIT_LOADED
) {
684 "%s\tStopWhenUnneeded: %s\n"
685 "%s\tRefuseManualStart: %s\n"
686 "%s\tRefuseManualStop: %s\n"
687 "%s\tDefaultDependencies: %s\n"
688 "%s\tOnFailureIsolate: %s\n"
689 "%s\tIgnoreOnIsolate: %s\n"
690 "%s\tIgnoreOnSnapshot: %s\n",
691 prefix
, yes_no(u
->stop_when_unneeded
),
692 prefix
, yes_no(u
->refuse_manual_start
),
693 prefix
, yes_no(u
->refuse_manual_stop
),
694 prefix
, yes_no(u
->default_dependencies
),
695 prefix
, yes_no(u
->on_failure_isolate
),
696 prefix
, yes_no(u
->ignore_on_isolate
),
697 prefix
, yes_no(u
->ignore_on_snapshot
));
699 LIST_FOREACH(by_unit
, b
, u
->cgroup_bondings
)
700 fprintf(f
, "%s\tControlGroup: %s:%s\n",
701 prefix
, b
->controller
, b
->path
);
703 LIST_FOREACH(by_unit
, a
, u
->cgroup_attributes
) {
707 a
->map_callback(a
->controller
, a
->name
, a
->value
, &v
);
709 fprintf(f
, "%s\tControlGroupAttribute: %s %s \"%s\"\n",
710 prefix
, a
->controller
, a
->name
, v
? v
: a
->value
);
715 if (UNIT_VTABLE(u
)->dump
)
716 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
718 } else if (u
->load_state
== UNIT_MERGED
)
720 "%s\tMerged into: %s\n",
721 prefix
, u
->merged_into
->id
);
722 else if (u
->load_state
== UNIT_ERROR
)
723 fprintf(f
, "%s\tLoad Error Code: %s\n", prefix
, strerror(-u
->load_error
));
727 job_dump(u
->job
, f
, prefix2
);
732 /* Common implementation for multiple backends */
733 int unit_load_fragment_and_dropin(Unit
*u
) {
738 /* Load a .service file */
739 if ((r
= unit_load_fragment(u
)) < 0)
742 if (u
->load_state
== UNIT_STUB
)
745 /* Load drop-in directory data */
746 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
752 /* Common implementation for multiple backends */
753 int unit_load_fragment_and_dropin_optional(Unit
*u
) {
758 /* Same as unit_load_fragment_and_dropin(), but whether
759 * something can be loaded or not doesn't matter. */
761 /* Load a .service file */
762 if ((r
= unit_load_fragment(u
)) < 0)
765 if (u
->load_state
== UNIT_STUB
)
766 u
->load_state
= UNIT_LOADED
;
768 /* Load drop-in directory data */
769 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
775 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
779 if (target
->type
!= UNIT_TARGET
)
782 /* Only add the dependency if both units are loaded, so that
783 * that loop check below is reliable */
784 if (u
->load_state
!= UNIT_LOADED
||
785 target
->load_state
!= UNIT_LOADED
)
788 /* If either side wants no automatic dependencies, then let's
790 if (!u
->default_dependencies
||
791 !target
->default_dependencies
)
794 /* Don't create loops */
795 if (set_get(target
->dependencies
[UNIT_BEFORE
], u
))
798 return unit_add_dependency(target
, UNIT_AFTER
, u
, true);
801 static int unit_add_default_dependencies(Unit
*u
) {
802 static const UnitDependency deps
[] = {
804 UNIT_REQUIRED_BY_OVERRIDABLE
,
816 for (k
= 0; k
< ELEMENTSOF(deps
); k
++)
817 SET_FOREACH(target
, u
->dependencies
[deps
[k
]], i
)
818 if ((r
= unit_add_default_target_dependency(u
, target
)) < 0)
824 int unit_load(Unit
*u
) {
829 if (u
->in_load_queue
) {
830 LIST_REMOVE(Unit
, load_queue
, u
->manager
->load_queue
, u
);
831 u
->in_load_queue
= false;
834 if (u
->type
== _UNIT_TYPE_INVALID
)
837 if (u
->load_state
!= UNIT_STUB
)
840 if (UNIT_VTABLE(u
)->load
)
841 if ((r
= UNIT_VTABLE(u
)->load(u
)) < 0)
844 if (u
->load_state
== UNIT_STUB
) {
849 if (u
->load_state
== UNIT_LOADED
&&
850 u
->default_dependencies
)
851 if ((r
= unit_add_default_dependencies(u
)) < 0)
854 if (u
->on_failure_isolate
&&
855 set_size(u
->dependencies
[UNIT_ON_FAILURE
]) > 1) {
857 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
864 assert((u
->load_state
!= UNIT_MERGED
) == !u
->merged_into
);
866 unit_add_to_dbus_queue(unit_follow_merge(u
));
867 unit_add_to_gc_queue(u
);
872 u
->load_state
= UNIT_ERROR
;
874 unit_add_to_dbus_queue(u
);
875 unit_add_to_gc_queue(u
);
877 log_debug("Failed to load configuration for %s: %s", u
->id
, strerror(-r
));
882 bool unit_condition_test(Unit
*u
) {
885 dual_timestamp_get(&u
->condition_timestamp
);
886 u
->condition_result
= condition_test_list(u
->conditions
);
888 return u
->condition_result
;
892 * -EBADR: This unit type does not support starting.
893 * -EALREADY: Unit is already started.
894 * -EAGAIN: An operation is already in progress. Retry later.
895 * -ECANCELED: Too many requests for now.
897 int unit_start(Unit
*u
) {
898 UnitActiveState state
;
903 if (u
->load_state
!= UNIT_LOADED
)
906 /* If this is already started, then this will succeed. Note
907 * that this will even succeed if this unit is not startable
908 * by the user. This is relied on to detect when we need to
909 * wait for units and when waiting is finished. */
910 state
= unit_active_state(u
);
911 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
914 /* If the conditions failed, don't do anything at all. If we
915 * already are activating this call might still be useful to
916 * speed up activation in case there is some hold-off time,
917 * but we don't want to recheck the condition in that case. */
918 if (state
!= UNIT_ACTIVATING
&&
919 !unit_condition_test(u
)) {
920 log_debug("Starting of %s requested but condition failed. Ignoring.", u
->id
);
924 /* Forward to the main object, if we aren't it. */
925 if ((following
= unit_following(u
))) {
926 log_debug("Redirecting start request from %s to %s.", u
->id
, following
->id
);
927 return unit_start(following
);
930 /* If it is stopped, but we cannot start it, then fail */
931 if (!UNIT_VTABLE(u
)->start
)
934 /* We don't suppress calls to ->start() here when we are
935 * already starting, to allow this request to be used as a
936 * "hurry up" call, for example when the unit is in some "auto
937 * restart" state where it waits for a holdoff timer to elapse
938 * before it will start again. */
940 unit_add_to_dbus_queue(u
);
942 unit_status_printf(u
, NULL
, "Starting %s...", unit_description(u
));
943 return UNIT_VTABLE(u
)->start(u
);
946 bool unit_can_start(Unit
*u
) {
949 return !!UNIT_VTABLE(u
)->start
;
952 bool unit_can_isolate(Unit
*u
) {
955 return unit_can_start(u
) &&
960 * -EBADR: This unit type does not support stopping.
961 * -EALREADY: Unit is already stopped.
962 * -EAGAIN: An operation is already in progress. Retry later.
964 int unit_stop(Unit
*u
) {
965 UnitActiveState state
;
970 state
= unit_active_state(u
);
971 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
974 if ((following
= unit_following(u
))) {
975 log_debug("Redirecting stop request from %s to %s.", u
->id
, following
->id
);
976 return unit_stop(following
);
979 if (!UNIT_VTABLE(u
)->stop
)
982 unit_add_to_dbus_queue(u
);
984 unit_status_printf(u
, NULL
, "Stopping %s...", unit_description(u
));
985 return UNIT_VTABLE(u
)->stop(u
);
989 * -EBADR: This unit type does not support reloading.
990 * -ENOEXEC: Unit is not started.
991 * -EAGAIN: An operation is already in progress. Retry later.
993 int unit_reload(Unit
*u
) {
994 UnitActiveState state
;
999 if (u
->load_state
!= UNIT_LOADED
)
1002 if (!unit_can_reload(u
))
1005 state
= unit_active_state(u
);
1006 if (state
== UNIT_RELOADING
)
1009 if (state
!= UNIT_ACTIVE
)
1012 if ((following
= unit_following(u
))) {
1013 log_debug("Redirecting reload request from %s to %s.", u
->id
, following
->id
);
1014 return unit_reload(following
);
1017 unit_add_to_dbus_queue(u
);
1018 return UNIT_VTABLE(u
)->reload(u
);
1021 bool unit_can_reload(Unit
*u
) {
1024 if (!UNIT_VTABLE(u
)->reload
)
1027 if (!UNIT_VTABLE(u
)->can_reload
)
1030 return UNIT_VTABLE(u
)->can_reload(u
);
1033 static void unit_check_unneeded(Unit
*u
) {
1039 /* If this service shall be shut down when unneeded then do
1042 if (!u
->stop_when_unneeded
)
1045 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
1048 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUIRED_BY
], i
)
1049 if (unit_pending_active(other
))
1052 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUIRED_BY_OVERRIDABLE
], i
)
1053 if (unit_pending_active(other
))
1056 SET_FOREACH(other
, u
->dependencies
[UNIT_WANTED_BY
], i
)
1057 if (unit_pending_active(other
))
1060 SET_FOREACH(other
, u
->dependencies
[UNIT_BOUND_BY
], i
)
1061 if (unit_pending_active(other
))
1064 log_info("Service %s is not needed anymore. Stopping.", u
->id
);
1066 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1067 manager_add_job(u
->manager
, JOB_STOP
, u
, JOB_FAIL
, true, NULL
, NULL
);
1070 static void retroactively_start_dependencies(Unit
*u
) {
1075 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
1077 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUIRES
], i
)
1078 if (!set_get(u
->dependencies
[UNIT_AFTER
], other
) &&
1079 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1080 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1082 SET_FOREACH(other
, u
->dependencies
[UNIT_BIND_TO
], i
)
1083 if (!set_get(u
->dependencies
[UNIT_AFTER
], other
) &&
1084 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1085 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1087 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
1088 if (!set_get(u
->dependencies
[UNIT_AFTER
], other
) &&
1089 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1090 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
, NULL
);
1092 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUISITE
], i
)
1093 if (!set_get(u
->dependencies
[UNIT_AFTER
], other
) &&
1094 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1095 manager_add_job(u
->manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1097 SET_FOREACH(other
, u
->dependencies
[UNIT_WANTS
], i
)
1098 if (!set_get(u
->dependencies
[UNIT_AFTER
], other
) &&
1099 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1100 manager_add_job(u
->manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
, NULL
);
1102 SET_FOREACH(other
, u
->dependencies
[UNIT_CONFLICTS
], i
)
1103 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1104 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1106 SET_FOREACH(other
, u
->dependencies
[UNIT_CONFLICTED_BY
], i
)
1107 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1108 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1111 static void retroactively_stop_dependencies(Unit
*u
) {
1116 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
1118 /* Pull down units which are bound to us recursively if enabled */
1119 SET_FOREACH(other
, u
->dependencies
[UNIT_BOUND_BY
], i
)
1120 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1121 manager_add_job(u
->manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1124 static void check_unneeded_dependencies(Unit
*u
) {
1129 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
1131 /* Garbage collect services that might not be needed anymore, if enabled */
1132 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUIRES
], i
)
1133 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1134 unit_check_unneeded(other
);
1135 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
1136 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1137 unit_check_unneeded(other
);
1138 SET_FOREACH(other
, u
->dependencies
[UNIT_WANTS
], i
)
1139 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1140 unit_check_unneeded(other
);
1141 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUISITE
], i
)
1142 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1143 unit_check_unneeded(other
);
1144 SET_FOREACH(other
, u
->dependencies
[UNIT_REQUISITE_OVERRIDABLE
], i
)
1145 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1146 unit_check_unneeded(other
);
1147 SET_FOREACH(other
, u
->dependencies
[UNIT_BIND_TO
], i
)
1148 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1149 unit_check_unneeded(other
);
1152 void unit_trigger_on_failure(Unit
*u
) {
1158 if (set_size(u
->dependencies
[UNIT_ON_FAILURE
]) <= 0)
1161 log_info("Triggering OnFailure= dependencies of %s.", u
->id
);
1163 SET_FOREACH(other
, u
->dependencies
[UNIT_ON_FAILURE
], i
) {
1166 if ((r
= manager_add_job(u
->manager
, JOB_START
, other
, u
->on_failure_isolate
? JOB_ISOLATE
: JOB_REPLACE
, true, NULL
, NULL
)) < 0)
1167 log_error("Failed to enqueue OnFailure= job: %s", strerror(-r
));
1171 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, bool reload_success
) {
1175 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
1176 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
1178 /* Note that this is called for all low-level state changes,
1179 * even if they might map to the same high-level
1180 * UnitActiveState! That means that ns == os is OK an expected
1181 * behaviour here. For example: if a mount point is remounted
1182 * this function will be called too! */
1184 if (u
->manager
->n_reloading
<= 0) {
1187 dual_timestamp_get(&ts
);
1189 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
1190 u
->inactive_exit_timestamp
= ts
;
1191 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
1192 u
->inactive_enter_timestamp
= ts
;
1194 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1195 u
->active_enter_timestamp
= ts
;
1196 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1197 u
->active_exit_timestamp
= ts
;
1199 timer_unit_notify(u
, ns
);
1200 path_unit_notify(u
, ns
);
1203 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1204 cgroup_bonding_trim_list(u
->cgroup_bondings
, true);
1209 if (u
->job
->state
== JOB_WAITING
)
1211 /* So we reached a different state for this
1212 * job. Let's see if we can run it now if it
1213 * failed previously due to EAGAIN. */
1214 job_add_to_run_queue(u
->job
);
1216 /* Let's check whether this state change constitutes a
1217 * finished job, or maybe contradicts a running job and
1218 * hence needs to invalidate jobs. */
1220 switch (u
->job
->type
) {
1223 case JOB_VERIFY_ACTIVE
:
1225 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1226 job_finish_and_invalidate(u
->job
, JOB_DONE
);
1227 else if (u
->job
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
1230 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1231 job_finish_and_invalidate(u
->job
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
);
1237 case JOB_RELOAD_OR_START
:
1239 if (u
->job
->state
== JOB_RUNNING
) {
1240 if (ns
== UNIT_ACTIVE
)
1241 job_finish_and_invalidate(u
->job
, reload_success
? JOB_DONE
: JOB_FAILED
);
1242 else if (ns
!= UNIT_ACTIVATING
&& ns
!= UNIT_RELOADING
) {
1245 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1246 job_finish_and_invalidate(u
->job
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
);
1254 case JOB_TRY_RESTART
:
1256 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1257 job_finish_and_invalidate(u
->job
, JOB_DONE
);
1258 else if (u
->job
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
1260 job_finish_and_invalidate(u
->job
, JOB_FAILED
);
1266 assert_not_reached("Job type unknown");
1272 if (u
->manager
->n_reloading
<= 0) {
1274 /* If this state change happened without being
1275 * requested by a job, then let's retroactively start
1276 * or stop dependencies. We skip that step when
1277 * deserializing, since we don't want to create any
1278 * additional jobs just because something is already
1282 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
1283 retroactively_start_dependencies(u
);
1284 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
1285 retroactively_stop_dependencies(u
);
1288 /* stop unneeded units regardless if going down was expected or not */
1289 if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
1290 check_unneeded_dependencies(u
);
1292 if (ns
!= os
&& ns
== UNIT_FAILED
) {
1293 log_notice("Unit %s entered failed state.", u
->id
);
1294 unit_trigger_on_failure(u
);
1298 /* Some names are special */
1299 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
1301 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
))
1302 /* The bus just might have become available,
1303 * hence try to connect to it, if we aren't
1305 bus_init(u
->manager
, true);
1307 if (u
->type
== UNIT_SERVICE
&&
1308 !UNIT_IS_ACTIVE_OR_RELOADING(os
) &&
1309 u
->manager
->n_reloading
<= 0) {
1310 /* Write audit record if we have just finished starting up */
1311 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, true);
1315 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
))
1316 manager_send_unit_plymouth(u
->manager
, u
);
1320 /* We don't care about D-Bus here, since we'll get an
1321 * asynchronous notification for it anyway. */
1323 if (u
->type
== UNIT_SERVICE
&&
1324 UNIT_IS_INACTIVE_OR_FAILED(ns
) &&
1325 !UNIT_IS_INACTIVE_OR_FAILED(os
) &&
1326 u
->manager
->n_reloading
<= 0) {
1328 /* Hmm, if there was no start record written
1329 * write it now, so that we always have a nice
1332 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_START
, ns
== UNIT_INACTIVE
);
1334 if (ns
== UNIT_INACTIVE
)
1335 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, true);
1337 /* Write audit record if we have just finished shutting down */
1338 manager_send_unit_audit(u
->manager
, u
, AUDIT_SERVICE_STOP
, ns
== UNIT_INACTIVE
);
1340 u
->in_audit
= false;
1344 manager_recheck_journal(u
->manager
);
1346 /* Maybe we finished startup and are now ready for being
1347 * stopped because unneeded? */
1348 unit_check_unneeded(u
);
1350 unit_add_to_dbus_queue(u
);
1351 unit_add_to_gc_queue(u
);
1354 int unit_watch_fd(Unit
*u
, int fd
, uint32_t events
, Watch
*w
) {
1355 struct epoll_event ev
;
1360 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_FD
&& w
->fd
== fd
&& w
->data
.unit
== u
));
1366 if (epoll_ctl(u
->manager
->epoll_fd
,
1367 w
->type
== WATCH_INVALID
? EPOLL_CTL_ADD
: EPOLL_CTL_MOD
,
1379 void unit_unwatch_fd(Unit
*u
, Watch
*w
) {
1383 if (w
->type
== WATCH_INVALID
)
1386 assert(w
->type
== WATCH_FD
);
1387 assert(w
->data
.unit
== u
);
1388 assert_se(epoll_ctl(u
->manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1391 w
->type
= WATCH_INVALID
;
1392 w
->data
.unit
= NULL
;
1395 int unit_watch_pid(Unit
*u
, pid_t pid
) {
1399 /* Watch a specific PID. We only support one unit watching
1400 * each PID for now. */
1402 return hashmap_put(u
->manager
->watch_pids
, LONG_TO_PTR(pid
), u
);
1405 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
1409 hashmap_remove_value(u
->manager
->watch_pids
, LONG_TO_PTR(pid
), u
);
1412 int unit_watch_timer(Unit
*u
, usec_t delay
, Watch
*w
) {
1413 struct itimerspec its
;
1419 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_UNIT_TIMER
&& w
->data
.unit
== u
));
1421 /* This will try to reuse the old timer if there is one */
1423 if (w
->type
== WATCH_UNIT_TIMER
) {
1424 assert(w
->data
.unit
== u
);
1429 } else if (w
->type
== WATCH_INVALID
) {
1432 if ((fd
= timerfd_create(CLOCK_MONOTONIC
, TFD_NONBLOCK
|TFD_CLOEXEC
)) < 0)
1435 assert_not_reached("Invalid watch type");
1440 /* Set absolute time in the past, but not 0, since we
1441 * don't want to disarm the timer */
1442 its
.it_value
.tv_sec
= 0;
1443 its
.it_value
.tv_nsec
= 1;
1445 flags
= TFD_TIMER_ABSTIME
;
1447 timespec_store(&its
.it_value
, delay
);
1451 /* This will also flush the elapse counter */
1452 if (timerfd_settime(fd
, flags
, &its
, NULL
) < 0)
1455 if (w
->type
== WATCH_INVALID
) {
1456 struct epoll_event ev
;
1460 ev
.events
= EPOLLIN
;
1462 if (epoll_ctl(u
->manager
->epoll_fd
, EPOLL_CTL_ADD
, fd
, &ev
) < 0)
1466 w
->type
= WATCH_UNIT_TIMER
;
1474 close_nointr_nofail(fd
);
1479 void unit_unwatch_timer(Unit
*u
, Watch
*w
) {
1483 if (w
->type
== WATCH_INVALID
)
1486 assert(w
->type
== WATCH_UNIT_TIMER
);
1487 assert(w
->data
.unit
== u
);
1490 assert_se(epoll_ctl(u
->manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1491 close_nointr_nofail(w
->fd
);
1494 w
->type
= WATCH_INVALID
;
1495 w
->data
.unit
= NULL
;
1498 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
1500 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
1504 case JOB_VERIFY_ACTIVE
:
1510 case JOB_TRY_RESTART
:
1511 return unit_can_start(u
);
1514 return unit_can_reload(u
);
1516 case JOB_RELOAD_OR_START
:
1517 return unit_can_reload(u
) && unit_can_start(u
);
1520 assert_not_reached("Invalid job type");
1524 int unit_add_dependency(Unit
*u
, UnitDependency d
, Unit
*other
, bool add_reference
) {
1526 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
1527 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
1528 [UNIT_REQUIRES_OVERRIDABLE
] = UNIT_REQUIRED_BY_OVERRIDABLE
,
1529 [UNIT_WANTS
] = UNIT_WANTED_BY
,
1530 [UNIT_REQUISITE
] = UNIT_REQUIRED_BY
,
1531 [UNIT_REQUISITE_OVERRIDABLE
] = UNIT_REQUIRED_BY_OVERRIDABLE
,
1532 [UNIT_BIND_TO
] = UNIT_BOUND_BY
,
1533 [UNIT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1534 [UNIT_REQUIRED_BY_OVERRIDABLE
] = _UNIT_DEPENDENCY_INVALID
,
1535 [UNIT_WANTED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1536 [UNIT_BOUND_BY
] = UNIT_BIND_TO
,
1537 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
1538 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
1539 [UNIT_BEFORE
] = UNIT_AFTER
,
1540 [UNIT_AFTER
] = UNIT_BEFORE
,
1541 [UNIT_ON_FAILURE
] = _UNIT_DEPENDENCY_INVALID
,
1542 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
1543 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
,
1544 [UNIT_TRIGGERS
] = UNIT_TRIGGERED_BY
,
1545 [UNIT_TRIGGERED_BY
] = UNIT_TRIGGERS
,
1546 [UNIT_PROPAGATE_RELOAD_TO
] = UNIT_PROPAGATE_RELOAD_FROM
,
1547 [UNIT_PROPAGATE_RELOAD_FROM
] = UNIT_PROPAGATE_RELOAD_TO
1549 int r
, q
= 0, v
= 0, w
= 0;
1552 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
1555 u
= unit_follow_merge(u
);
1556 other
= unit_follow_merge(other
);
1558 /* We won't allow dependencies on ourselves. We will not
1559 * consider them an error however. */
1563 if ((r
= set_ensure_allocated(&u
->dependencies
[d
], trivial_hash_func
, trivial_compare_func
)) < 0)
1566 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
)
1567 if ((r
= set_ensure_allocated(&other
->dependencies
[inverse_table
[d
]], trivial_hash_func
, trivial_compare_func
)) < 0)
1571 if ((r
= set_ensure_allocated(&u
->dependencies
[UNIT_REFERENCES
], trivial_hash_func
, trivial_compare_func
)) < 0 ||
1572 (r
= set_ensure_allocated(&other
->dependencies
[UNIT_REFERENCED_BY
], trivial_hash_func
, trivial_compare_func
)) < 0)
1575 if ((q
= set_put(u
->dependencies
[d
], other
)) < 0)
1578 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
)
1579 if ((v
= set_put(other
->dependencies
[inverse_table
[d
]], u
)) < 0) {
1584 if (add_reference
) {
1585 if ((w
= set_put(u
->dependencies
[UNIT_REFERENCES
], other
)) < 0) {
1590 if ((r
= set_put(other
->dependencies
[UNIT_REFERENCED_BY
], u
)) < 0)
1594 unit_add_to_dbus_queue(u
);
1599 set_remove(u
->dependencies
[d
], other
);
1602 set_remove(other
->dependencies
[inverse_table
[d
]], u
);
1605 set_remove(u
->dependencies
[UNIT_REFERENCES
], other
);
1610 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
) {
1615 if ((r
= unit_add_dependency(u
, d
, other
, add_reference
)) < 0)
1618 if ((r
= unit_add_dependency(u
, e
, other
, add_reference
)) < 0)
1624 static const char *resolve_template(Unit
*u
, const char *name
, const char*path
, char **p
) {
1628 assert(name
|| path
);
1631 name
= file_name_from_path(path
);
1633 if (!unit_name_is_template(name
)) {
1639 s
= unit_name_replace_instance(name
, u
->instance
);
1643 if (!(i
= unit_name_to_prefix(u
->id
)))
1646 s
= unit_name_replace_instance(name
, i
);
1657 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, const char *path
, bool add_reference
) {
1663 assert(name
|| path
);
1665 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1668 if ((r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
)) < 0)
1671 r
= unit_add_dependency(u
, d
, other
, add_reference
);
1678 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, const char *path
, bool add_reference
) {
1684 assert(name
|| path
);
1686 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1689 if ((r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
)) < 0)
1692 r
= unit_add_two_dependencies(u
, d
, e
, other
, add_reference
);
1699 int unit_add_dependency_by_name_inverse(Unit
*u
, UnitDependency d
, const char *name
, const char *path
, bool add_reference
) {
1705 assert(name
|| path
);
1707 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1710 if ((r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
)) < 0)
1713 r
= unit_add_dependency(other
, d
, u
, add_reference
);
1720 int unit_add_two_dependencies_by_name_inverse(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, const char *path
, bool add_reference
) {
1726 assert(name
|| path
);
1728 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1731 if ((r
= manager_load_unit(u
->manager
, name
, path
, NULL
, &other
)) < 0)
1734 if ((r
= unit_add_two_dependencies(other
, d
, e
, u
, add_reference
)) < 0)
1742 int set_unit_path(const char *p
) {
1746 /* This is mostly for debug purposes */
1748 if (path_is_absolute(p
)) {
1749 if (!(c
= strdup(p
)))
1752 if (!(cwd
= get_current_dir_name()))
1755 r
= asprintf(&c
, "%s/%s", cwd
, p
);
1762 if (setenv("SYSTEMD_UNIT_PATH", c
, 0) < 0) {
1771 char *unit_dbus_path(Unit
*u
) {
1779 if (!(e
= bus_path_escape(u
->id
)))
1782 p
= strappend("/org/freedesktop/systemd1/unit/", e
);
1788 int unit_add_cgroup(Unit
*u
, CGroupBonding
*b
) {
1796 if (!b
->controller
) {
1797 if (!(b
->controller
= strdup(SYSTEMD_CGROUP_CONTROLLER
)))
1803 /* Ensure this hasn't been added yet */
1806 if (streq(b
->controller
, SYSTEMD_CGROUP_CONTROLLER
)) {
1809 l
= hashmap_get(u
->manager
->cgroup_bondings
, b
->path
);
1810 LIST_PREPEND(CGroupBonding
, by_path
, l
, b
);
1812 if ((r
= hashmap_replace(u
->manager
->cgroup_bondings
, b
->path
, l
)) < 0) {
1813 LIST_REMOVE(CGroupBonding
, by_path
, l
, b
);
1818 LIST_PREPEND(CGroupBonding
, by_unit
, u
->cgroup_bondings
, b
);
1824 static char *default_cgroup_path(Unit
*u
) {
1832 t
= unit_name_template(u
->id
);
1836 p
= join(u
->manager
->cgroup_hierarchy
, "/", t
, "/", u
->instance
, NULL
);
1839 p
= join(u
->manager
->cgroup_hierarchy
, "/", u
->id
, NULL
);
1844 int unit_add_cgroup_from_text(Unit
*u
, const char *name
) {
1845 char *controller
= NULL
, *path
= NULL
;
1846 CGroupBonding
*b
= NULL
;
1853 if ((r
= cg_split_spec(name
, &controller
, &path
)) < 0)
1857 path
= default_cgroup_path(u
);
1862 controller
= strdup(SYSTEMD_CGROUP_CONTROLLER
);
1866 if (!path
|| !controller
) {
1873 if (cgroup_bonding_find_list(u
->cgroup_bondings
, controller
)) {
1878 if (!(b
= new0(CGroupBonding
, 1))) {
1883 b
->controller
= controller
;
1886 b
->essential
= streq(controller
, SYSTEMD_CGROUP_CONTROLLER
);
1888 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1901 static int unit_add_one_default_cgroup(Unit
*u
, const char *controller
) {
1902 CGroupBonding
*b
= NULL
;
1908 controller
= SYSTEMD_CGROUP_CONTROLLER
;
1910 if (cgroup_bonding_find_list(u
->cgroup_bondings
, controller
))
1913 if (!(b
= new0(CGroupBonding
, 1)))
1916 if (!(b
->controller
= strdup(controller
)))
1919 if (!(b
->path
= default_cgroup_path(u
)))
1923 b
->essential
= streq(controller
, SYSTEMD_CGROUP_CONTROLLER
);
1925 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1932 free(b
->controller
);
1938 int unit_add_default_cgroups(Unit
*u
) {
1945 /* Adds in the default cgroups, if they weren't specified
1948 if (!u
->manager
->cgroup_hierarchy
)
1951 if ((r
= unit_add_one_default_cgroup(u
, NULL
)) < 0)
1954 STRV_FOREACH(c
, u
->manager
->default_controllers
)
1955 unit_add_one_default_cgroup(u
, *c
);
1957 LIST_FOREACH(by_unit
, a
, u
->cgroup_attributes
)
1958 unit_add_one_default_cgroup(u
, a
->controller
);
1963 CGroupBonding
* unit_get_default_cgroup(Unit
*u
) {
1966 return cgroup_bonding_find_list(u
->cgroup_bondings
, SYSTEMD_CGROUP_CONTROLLER
);
1969 int unit_add_cgroup_attribute(Unit
*u
, const char *controller
, const char *name
, const char *value
, CGroupAttributeMapCallback map_callback
) {
1981 dot
= strchr(name
, '.');
1985 c
= strndup(name
, dot
- name
);
1992 if (streq(controller
, SYSTEMD_CGROUP_CONTROLLER
)) {
1997 a
= new0(CGroupAttribute
, 1);
2007 a
->controller
= strdup(controller
);
2009 a
->name
= strdup(name
);
2010 a
->value
= strdup(value
);
2012 if (!a
->controller
|| !a
->name
|| !a
->value
) {
2013 free(a
->controller
);
2021 a
->map_callback
= map_callback
;
2023 LIST_PREPEND(CGroupAttribute
, by_unit
, u
->cgroup_attributes
, a
);
2032 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
2040 if (!(t
= unit_name_change_suffix(u
->id
, type
)))
2043 assert(!unit_has_name(u
, t
));
2045 r
= manager_load_unit(u
->manager
, t
, NULL
, NULL
, _found
);
2048 assert(r
< 0 || *_found
!= u
);
2053 int unit_get_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
2061 if (!(t
= unit_name_change_suffix(u
->id
, type
)))
2064 assert(!unit_has_name(u
, t
));
2066 found
= manager_get_unit(u
->manager
, t
);
2076 static char *specifier_prefix_and_instance(char specifier
, void *data
, void *userdata
) {
2080 return unit_name_to_prefix_and_instance(u
->id
);
2083 static char *specifier_prefix(char specifier
, void *data
, void *userdata
) {
2087 return unit_name_to_prefix(u
->id
);
2090 static char *specifier_prefix_unescaped(char specifier
, void *data
, void *userdata
) {
2096 if (!(p
= unit_name_to_prefix(u
->id
)))
2099 r
= unit_name_unescape(p
);
2105 static char *specifier_instance_unescaped(char specifier
, void *data
, void *userdata
) {
2110 return unit_name_unescape(u
->instance
);
2115 static char *specifier_filename(char specifier
, void *data
, void *userdata
) {
2120 return unit_name_path_unescape(u
->instance
);
2122 return unit_name_to_path(u
->instance
);
2125 static char *specifier_cgroup(char specifier
, void *data
, void *userdata
) {
2129 return default_cgroup_path(u
);
2132 static char *specifier_cgroup_root(char specifier
, void *data
, void *userdata
) {
2137 if (specifier
== 'r')
2138 return strdup(u
->manager
->cgroup_hierarchy
);
2140 if (parent_of_path(u
->manager
->cgroup_hierarchy
, &p
) < 0)
2143 if (streq(p
, "/")) {
2151 static char *specifier_runtime(char specifier
, void *data
, void *userdata
) {
2155 if (u
->manager
->running_as
== MANAGER_USER
) {
2158 e
= getenv("XDG_RUNTIME_DIR");
2163 return strdup("/run");
2166 char *unit_name_printf(Unit
*u
, const char* format
) {
2169 * This will use the passed string as format string and
2170 * replace the following specifiers:
2172 * %n: the full id of the unit (foo@bar.waldo)
2173 * %N: the id of the unit without the suffix (foo@bar)
2174 * %p: the prefix (foo)
2175 * %i: the instance (bar)
2178 const Specifier table
[] = {
2179 { 'n', specifier_string
, u
->id
},
2180 { 'N', specifier_prefix_and_instance
, NULL
},
2181 { 'p', specifier_prefix
, NULL
},
2182 { 'i', specifier_string
, u
->instance
},
2189 return specifier_printf(format
, table
, u
);
2192 char *unit_full_printf(Unit
*u
, const char *format
) {
2194 /* This is similar to unit_name_printf() but also supports
2195 * unescaping. Also, adds a couple of additional codes:
2197 * %c cgroup path of unit
2198 * %r root cgroup path of this systemd instance (e.g. "/user/lennart/shared/systemd-4711")
2199 * %R parent of root cgroup path (e.g. "/usr/lennart/shared")
2200 * %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
2203 const Specifier table
[] = {
2204 { 'n', specifier_string
, u
->id
},
2205 { 'N', specifier_prefix_and_instance
, NULL
},
2206 { 'p', specifier_prefix
, NULL
},
2207 { 'P', specifier_prefix_unescaped
, NULL
},
2208 { 'i', specifier_string
, u
->instance
},
2209 { 'I', specifier_instance_unescaped
, NULL
},
2210 { 'f', specifier_filename
, NULL
},
2211 { 'c', specifier_cgroup
, NULL
},
2212 { 'r', specifier_cgroup_root
, NULL
},
2213 { 'R', specifier_cgroup_root
, NULL
},
2214 { 't', specifier_runtime
, NULL
},
2221 return specifier_printf(format
, table
, u
);
2224 char **unit_full_printf_strv(Unit
*u
, char **l
) {
2228 /* Applies unit_full_printf to every entry in l */
2233 if (!(r
= new(char*, n
+1)))
2236 for (i
= l
, j
= r
; *i
; i
++, j
++)
2237 if (!(*j
= unit_full_printf(u
, *i
)))
2244 for (j
--; j
>= r
; j
--)
2252 int unit_watch_bus_name(Unit
*u
, const char *name
) {
2256 /* Watch a specific name on the bus. We only support one unit
2257 * watching each name for now. */
2259 return hashmap_put(u
->manager
->watch_bus
, name
, u
);
2262 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
2266 hashmap_remove_value(u
->manager
->watch_bus
, name
, u
);
2269 bool unit_can_serialize(Unit
*u
) {
2272 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
2275 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
2282 if (!unit_can_serialize(u
))
2285 if ((r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
)) < 0)
2289 unit_serialize_item(u
, f
, "job", job_type_to_string(u
->job
->type
));
2291 dual_timestamp_serialize(f
, "inactive-exit-timestamp", &u
->inactive_exit_timestamp
);
2292 dual_timestamp_serialize(f
, "active-enter-timestamp", &u
->active_enter_timestamp
);
2293 dual_timestamp_serialize(f
, "active-exit-timestamp", &u
->active_exit_timestamp
);
2294 dual_timestamp_serialize(f
, "inactive-enter-timestamp", &u
->inactive_enter_timestamp
);
2295 dual_timestamp_serialize(f
, "condition-timestamp", &u
->condition_timestamp
);
2297 if (dual_timestamp_is_set(&u
->condition_timestamp
))
2298 unit_serialize_item(u
, f
, "condition-result", yes_no(u
->condition_result
));
2305 void unit_serialize_item_format(Unit
*u
, FILE *f
, const char *key
, const char *format
, ...) {
2316 va_start(ap
, format
);
2317 vfprintf(f
, format
, ap
);
2323 void unit_serialize_item(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
2329 fprintf(f
, "%s=%s\n", key
, value
);
2332 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
2339 if (!unit_can_serialize(u
))
2343 char line
[LINE_MAX
], *l
, *v
;
2346 if (!fgets(line
, sizeof(line
), f
)) {
2359 k
= strcspn(l
, "=");
2367 if (streq(l
, "job")) {
2370 if ((type
= job_type_from_string(v
)) < 0)
2371 log_debug("Failed to parse job type value %s", v
);
2373 u
->deserialized_job
= type
;
2376 } else if (streq(l
, "inactive-exit-timestamp")) {
2377 dual_timestamp_deserialize(v
, &u
->inactive_exit_timestamp
);
2379 } else if (streq(l
, "active-enter-timestamp")) {
2380 dual_timestamp_deserialize(v
, &u
->active_enter_timestamp
);
2382 } else if (streq(l
, "active-exit-timestamp")) {
2383 dual_timestamp_deserialize(v
, &u
->active_exit_timestamp
);
2385 } else if (streq(l
, "inactive-enter-timestamp")) {
2386 dual_timestamp_deserialize(v
, &u
->inactive_enter_timestamp
);
2388 } else if (streq(l
, "condition-timestamp")) {
2389 dual_timestamp_deserialize(v
, &u
->condition_timestamp
);
2391 } else if (streq(l
, "condition-result")) {
2394 if ((b
= parse_boolean(v
)) < 0)
2395 log_debug("Failed to parse condition result value %s", v
);
2397 u
->condition_result
= b
;
2402 if ((r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
)) < 0)
2407 int unit_add_node_link(Unit
*u
, const char *what
, bool wants
) {
2417 /* Adds in links to the device node that this unit is based on */
2419 if (!is_device_path(what
))
2422 if (!(e
= unit_name_build_escape(what
+1, NULL
, ".device")))
2425 r
= manager_load_unit(u
->manager
, e
, NULL
, NULL
, &device
);
2431 if ((r
= unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_BIND_TO
, device
, true)) < 0)
2435 if ((r
= unit_add_dependency(device
, UNIT_WANTS
, u
, false)) < 0)
2441 int unit_coldplug(Unit
*u
) {
2446 if (UNIT_VTABLE(u
)->coldplug
)
2447 if ((r
= UNIT_VTABLE(u
)->coldplug(u
)) < 0)
2450 if (u
->deserialized_job
>= 0) {
2451 if ((r
= manager_add_job(u
->manager
, u
->deserialized_job
, u
, JOB_IGNORE_REQUIREMENTS
, false, NULL
, NULL
)) < 0)
2454 u
->deserialized_job
= _JOB_TYPE_INVALID
;
2460 void unit_status_printf(Unit
*u
, const char *status
, const char *format
, ...) {
2466 if (!UNIT_VTABLE(u
)->show_status
)
2469 if (!manager_get_show_status(u
->manager
))
2472 if (!manager_is_booting_or_shutting_down(u
->manager
))
2475 va_start(ap
, format
);
2476 status_vprintf(status
, true, format
, ap
);
2480 bool unit_need_daemon_reload(Unit
*u
) {
2483 if (u
->fragment_path
) {
2487 if (stat(u
->fragment_path
, &st
) < 0)
2488 /* What, cannot access this anymore? */
2491 if (u
->fragment_mtime
> 0 &&
2492 timespec_load(&st
.st_mtim
) != u
->fragment_mtime
)
2496 if (UNIT_VTABLE(u
)->need_daemon_reload
)
2497 return UNIT_VTABLE(u
)->need_daemon_reload(u
);
2502 void unit_reset_failed(Unit
*u
) {
2505 if (UNIT_VTABLE(u
)->reset_failed
)
2506 UNIT_VTABLE(u
)->reset_failed(u
);
2509 Unit
*unit_following(Unit
*u
) {
2512 if (UNIT_VTABLE(u
)->following
)
2513 return UNIT_VTABLE(u
)->following(u
);
2518 bool unit_pending_inactive(Unit
*u
) {
2521 /* Returns true if the unit is inactive or going down */
2523 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
2526 if (u
->job
&& u
->job
->type
== JOB_STOP
)
2532 bool unit_pending_active(Unit
*u
) {
2535 /* Returns true if the unit is active or going up */
2537 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
2541 (u
->job
->type
== JOB_START
||
2542 u
->job
->type
== JOB_RELOAD_OR_START
||
2543 u
->job
->type
== JOB_RESTART
))
2549 UnitType
unit_name_to_type(const char *n
) {
2554 for (t
= 0; t
< _UNIT_TYPE_MAX
; t
++)
2555 if (endswith(n
, unit_vtable
[t
]->suffix
))
2558 return _UNIT_TYPE_INVALID
;
2561 bool unit_name_is_valid(const char *n
, bool template_ok
) {
2564 t
= unit_name_to_type(n
);
2565 if (t
< 0 || t
>= _UNIT_TYPE_MAX
)
2568 return unit_name_is_valid_no_type(n
, template_ok
);
2571 int unit_kill(Unit
*u
, KillWho w
, KillMode m
, int signo
, DBusError
*error
) {
2573 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
2574 assert(m
>= 0 && m
< _KILL_MODE_MAX
);
2576 assert(signo
< _NSIG
);
2581 if (!UNIT_VTABLE(u
)->kill
)
2584 return UNIT_VTABLE(u
)->kill(u
, w
, m
, signo
, error
);
2587 int unit_following_set(Unit
*u
, Set
**s
) {
2591 if (UNIT_VTABLE(u
)->following_set
)
2592 return UNIT_VTABLE(u
)->following_set(u
, s
);
2598 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
2601 if (u
->unit_file_state
< 0 && u
->fragment_path
)
2602 u
->unit_file_state
= unit_file_get_state(
2603 u
->manager
->running_as
== MANAGER_SYSTEM
? UNIT_FILE_SYSTEM
: UNIT_FILE_USER
,
2604 NULL
, file_name_from_path(u
->fragment_path
));
2606 return u
->unit_file_state
;
2609 Unit
* unit_ref_set(UnitRef
*ref
, Unit
*u
) {
2614 unit_ref_unset(ref
);
2617 LIST_PREPEND(UnitRef
, refs
, u
->refs
, ref
);
2621 void unit_ref_unset(UnitRef
*ref
) {
2627 LIST_REMOVE(UnitRef
, refs
, ref
->unit
->refs
, ref
);
2631 static const char* const unit_load_state_table
[_UNIT_LOAD_STATE_MAX
] = {
2632 [UNIT_STUB
] = "stub",
2633 [UNIT_LOADED
] = "loaded",
2634 [UNIT_ERROR
] = "error",
2635 [UNIT_MERGED
] = "merged",
2636 [UNIT_MASKED
] = "masked"
2639 DEFINE_STRING_TABLE_LOOKUP(unit_load_state
, UnitLoadState
);
2641 static const char* const unit_active_state_table
[_UNIT_ACTIVE_STATE_MAX
] = {
2642 [UNIT_ACTIVE
] = "active",
2643 [UNIT_RELOADING
] = "reloading",
2644 [UNIT_INACTIVE
] = "inactive",
2645 [UNIT_FAILED
] = "failed",
2646 [UNIT_ACTIVATING
] = "activating",
2647 [UNIT_DEACTIVATING
] = "deactivating"
2650 DEFINE_STRING_TABLE_LOOKUP(unit_active_state
, UnitActiveState
);
2652 static const char* const unit_dependency_table
[_UNIT_DEPENDENCY_MAX
] = {
2653 [UNIT_REQUIRES
] = "Requires",
2654 [UNIT_REQUIRES_OVERRIDABLE
] = "RequiresOverridable",
2655 [UNIT_WANTS
] = "Wants",
2656 [UNIT_REQUISITE
] = "Requisite",
2657 [UNIT_REQUISITE_OVERRIDABLE
] = "RequisiteOverridable",
2658 [UNIT_REQUIRED_BY
] = "RequiredBy",
2659 [UNIT_REQUIRED_BY_OVERRIDABLE
] = "RequiredByOverridable",
2660 [UNIT_BIND_TO
] = "BindTo",
2661 [UNIT_WANTED_BY
] = "WantedBy",
2662 [UNIT_CONFLICTS
] = "Conflicts",
2663 [UNIT_CONFLICTED_BY
] = "ConflictedBy",
2664 [UNIT_BOUND_BY
] = "BoundBy",
2665 [UNIT_BEFORE
] = "Before",
2666 [UNIT_AFTER
] = "After",
2667 [UNIT_REFERENCES
] = "References",
2668 [UNIT_REFERENCED_BY
] = "ReferencedBy",
2669 [UNIT_ON_FAILURE
] = "OnFailure",
2670 [UNIT_TRIGGERS
] = "Triggers",
2671 [UNIT_TRIGGERED_BY
] = "TriggeredBy",
2672 [UNIT_PROPAGATE_RELOAD_TO
] = "PropagateReloadTo",
2673 [UNIT_PROPAGATE_RELOAD_FROM
] = "PropagateReloadFrom"
2676 DEFINE_STRING_TABLE_LOOKUP(unit_dependency
, UnitDependency
);