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"
46 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
47 [UNIT_SERVICE
] = &service_vtable
,
48 [UNIT_TIMER
] = &timer_vtable
,
49 [UNIT_SOCKET
] = &socket_vtable
,
50 [UNIT_TARGET
] = &target_vtable
,
51 [UNIT_DEVICE
] = &device_vtable
,
52 [UNIT_MOUNT
] = &mount_vtable
,
53 [UNIT_AUTOMOUNT
] = &automount_vtable
,
54 [UNIT_SNAPSHOT
] = &snapshot_vtable
,
55 [UNIT_SWAP
] = &swap_vtable
,
56 [UNIT_PATH
] = &path_vtable
59 Unit
*unit_new(Manager
*m
) {
64 if (!(u
= new0(Unit
, 1)))
67 if (!(u
->meta
.names
= set_new(string_hash_func
, string_compare_func
))) {
73 u
->meta
.type
= _UNIT_TYPE_INVALID
;
74 u
->meta
.deserialized_job
= _JOB_TYPE_INVALID
;
75 u
->meta
.default_dependencies
= true;
80 bool unit_has_name(Unit
*u
, const char *name
) {
84 return !!set_get(u
->meta
.names
, (char*) name
);
87 int unit_add_name(Unit
*u
, const char *text
) {
95 if (unit_name_is_template(text
)) {
96 if (!u
->meta
.instance
)
99 s
= unit_name_replace_instance(text
, u
->meta
.instance
);
106 if (!unit_name_is_valid(s
, false)) {
111 assert_se((t
= unit_name_to_type(s
)) >= 0);
113 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
&& t
!= u
->meta
.type
) {
118 if ((r
= unit_name_to_instance(s
, &i
)) < 0)
121 if (i
&& unit_vtable
[t
]->no_instances
)
124 /* Ensure that this unit is either instanced or not instanced,
126 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
&& !u
->meta
.instance
!= !i
) {
131 if (unit_vtable
[t
]->no_alias
&&
132 !set_isempty(u
->meta
.names
) &&
133 !set_get(u
->meta
.names
, s
)) {
138 if (hashmap_size(u
->meta
.manager
->units
) >= MANAGER_MAX_NAMES
) {
143 if ((r
= set_put(u
->meta
.names
, s
)) < 0) {
149 if ((r
= hashmap_put(u
->meta
.manager
->units
, s
, u
)) < 0) {
150 set_remove(u
->meta
.names
, s
);
154 if (u
->meta
.type
== _UNIT_TYPE_INVALID
) {
158 u
->meta
.instance
= i
;
160 LIST_PREPEND(Meta
, units_per_type
, u
->meta
.manager
->units_per_type
[t
], &u
->meta
);
162 if (UNIT_VTABLE(u
)->init
)
163 UNIT_VTABLE(u
)->init(u
);
167 unit_add_to_dbus_queue(u
);
177 int unit_choose_id(Unit
*u
, const char *name
) {
178 char *s
, *t
= NULL
, *i
;
184 if (unit_name_is_template(name
)) {
186 if (!u
->meta
.instance
)
189 if (!(t
= unit_name_replace_instance(name
, u
->meta
.instance
)))
195 /* Selects one of the names of this unit as the id */
196 s
= set_get(u
->meta
.names
, (char*) name
);
202 if ((r
= unit_name_to_instance(s
, &i
)) < 0)
207 free(u
->meta
.instance
);
208 u
->meta
.instance
= i
;
210 unit_add_to_dbus_queue(u
);
215 int unit_set_description(Unit
*u
, const char *description
) {
220 if (!(s
= strdup(description
)))
223 free(u
->meta
.description
);
224 u
->meta
.description
= s
;
226 unit_add_to_dbus_queue(u
);
230 bool unit_check_gc(Unit
*u
) {
233 if (u
->meta
.load_state
== UNIT_STUB
)
236 if (UNIT_VTABLE(u
)->no_gc
)
245 if (unit_active_state(u
) != UNIT_INACTIVE
)
248 if (UNIT_VTABLE(u
)->check_gc
)
249 if (UNIT_VTABLE(u
)->check_gc(u
))
255 void unit_add_to_load_queue(Unit
*u
) {
257 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
259 if (u
->meta
.load_state
!= UNIT_STUB
|| u
->meta
.in_load_queue
)
262 LIST_PREPEND(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
263 u
->meta
.in_load_queue
= true;
266 void unit_add_to_cleanup_queue(Unit
*u
) {
269 if (u
->meta
.in_cleanup_queue
)
272 LIST_PREPEND(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
273 u
->meta
.in_cleanup_queue
= true;
276 void unit_add_to_gc_queue(Unit
*u
) {
279 if (u
->meta
.in_gc_queue
|| u
->meta
.in_cleanup_queue
)
282 if (unit_check_gc(u
))
285 LIST_PREPEND(Meta
, gc_queue
, u
->meta
.manager
->gc_queue
, &u
->meta
);
286 u
->meta
.in_gc_queue
= true;
288 u
->meta
.manager
->n_in_gc_queue
++;
290 if (u
->meta
.manager
->gc_queue_timestamp
<= 0)
291 u
->meta
.manager
->gc_queue_timestamp
= now(CLOCK_MONOTONIC
);
294 void unit_add_to_dbus_queue(Unit
*u
) {
296 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
298 if (u
->meta
.load_state
== UNIT_STUB
|| u
->meta
.in_dbus_queue
)
301 /* Shortcut things if nobody cares */
302 if (!bus_has_subscriber(u
->meta
.manager
)) {
303 u
->meta
.sent_dbus_new_signal
= true;
307 LIST_PREPEND(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
308 u
->meta
.in_dbus_queue
= true;
311 static void bidi_set_free(Unit
*u
, Set
*s
) {
317 /* Frees the set and makes sure we are dropped from the
318 * inverse pointers */
320 SET_FOREACH(other
, s
, i
) {
323 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
324 set_remove(other
->meta
.dependencies
[d
], u
);
326 unit_add_to_gc_queue(other
);
332 void unit_free(Unit
*u
) {
339 bus_unit_send_removed_signal(u
);
341 if (u
->meta
.load_state
!= UNIT_STUB
)
342 if (UNIT_VTABLE(u
)->done
)
343 UNIT_VTABLE(u
)->done(u
);
345 SET_FOREACH(t
, u
->meta
.names
, i
)
346 hashmap_remove_value(u
->meta
.manager
->units
, t
, u
);
349 job_free(u
->meta
.job
);
351 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
352 bidi_set_free(u
, u
->meta
.dependencies
[d
]);
354 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
)
355 LIST_REMOVE(Meta
, units_per_type
, u
->meta
.manager
->units_per_type
[u
->meta
.type
], &u
->meta
);
357 if (u
->meta
.in_load_queue
)
358 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
360 if (u
->meta
.in_dbus_queue
)
361 LIST_REMOVE(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
363 if (u
->meta
.in_cleanup_queue
)
364 LIST_REMOVE(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
366 if (u
->meta
.in_gc_queue
) {
367 LIST_REMOVE(Meta
, gc_queue
, u
->meta
.manager
->gc_queue
, &u
->meta
);
368 u
->meta
.manager
->n_in_gc_queue
--;
371 cgroup_bonding_free_list(u
->meta
.cgroup_bondings
);
373 free(u
->meta
.description
);
374 free(u
->meta
.fragment_path
);
376 set_free_free(u
->meta
.names
);
378 condition_free_list(u
->meta
.conditions
);
380 free(u
->meta
.instance
);
384 UnitActiveState
unit_active_state(Unit
*u
) {
387 if (u
->meta
.load_state
== UNIT_MERGED
)
388 return unit_active_state(unit_follow_merge(u
));
390 /* After a reload it might happen that a unit is not correctly
391 * loaded but still has a process around. That's why we won't
392 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
394 return UNIT_VTABLE(u
)->active_state(u
);
397 const char* unit_sub_state_to_string(Unit
*u
) {
400 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
403 static void complete_move(Set
**s
, Set
**other
) {
411 set_move(*s
, *other
);
418 static void merge_names(Unit
*u
, Unit
*other
) {
425 complete_move(&u
->meta
.names
, &other
->meta
.names
);
427 set_free_free(other
->meta
.names
);
428 other
->meta
.names
= NULL
;
429 other
->meta
.id
= NULL
;
431 SET_FOREACH(t
, u
->meta
.names
, i
)
432 assert_se(hashmap_replace(u
->meta
.manager
->units
, t
, u
) == 0);
435 static void merge_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
442 assert(d
< _UNIT_DEPENDENCY_MAX
);
444 /* Fix backwards pointers */
445 SET_FOREACH(back
, other
->meta
.dependencies
[d
], i
) {
448 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++)
449 if ((r
= set_remove_and_put(back
->meta
.dependencies
[k
], other
, u
)) < 0) {
452 set_remove(back
->meta
.dependencies
[k
], other
);
454 assert(r
== -ENOENT
);
458 complete_move(&u
->meta
.dependencies
[d
], &other
->meta
.dependencies
[d
]);
460 set_free(other
->meta
.dependencies
[d
]);
461 other
->meta
.dependencies
[d
] = NULL
;
464 int unit_merge(Unit
*u
, Unit
*other
) {
469 assert(u
->meta
.manager
== other
->meta
.manager
);
470 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
472 other
= unit_follow_merge(other
);
477 if (u
->meta
.type
!= other
->meta
.type
)
480 if (!u
->meta
.instance
!= !other
->meta
.instance
)
483 if (other
->meta
.load_state
!= UNIT_STUB
&&
484 other
->meta
.load_state
!= UNIT_ERROR
)
490 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
494 merge_names(u
, other
);
496 /* Merge dependencies */
497 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
498 merge_dependencies(u
, other
, d
);
500 other
->meta
.load_state
= UNIT_MERGED
;
501 other
->meta
.merged_into
= u
;
503 /* If there is still some data attached to the other node, we
504 * don't need it anymore, and can free it. */
505 if (other
->meta
.load_state
!= UNIT_STUB
)
506 if (UNIT_VTABLE(other
)->done
)
507 UNIT_VTABLE(other
)->done(other
);
509 unit_add_to_dbus_queue(u
);
510 unit_add_to_cleanup_queue(other
);
515 int unit_merge_by_name(Unit
*u
, const char *name
) {
523 if (unit_name_is_template(name
)) {
524 if (!u
->meta
.instance
)
527 if (!(s
= unit_name_replace_instance(name
, u
->meta
.instance
)))
533 if (!(other
= manager_get_unit(u
->meta
.manager
, name
)))
534 r
= unit_add_name(u
, name
);
536 r
= unit_merge(u
, other
);
542 Unit
* unit_follow_merge(Unit
*u
) {
545 while (u
->meta
.load_state
== UNIT_MERGED
)
546 assert_se(u
= u
->meta
.merged_into
);
551 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
557 if (c
->std_output
!= EXEC_OUTPUT_KMSG
&&
558 c
->std_output
!= EXEC_OUTPUT_SYSLOG
&&
559 c
->std_error
!= EXEC_OUTPUT_KMSG
&&
560 c
->std_error
!= EXEC_OUTPUT_SYSLOG
)
563 /* If syslog or kernel logging is requested, make sure our own
564 * logging daemon is run first. */
566 if ((r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_LOGGER_SOCKET
, NULL
, true)) < 0)
569 if (u
->meta
.manager
->running_as
== MANAGER_SYSTEM
)
570 if ((r
= unit_add_dependency_by_name(u
, UNIT_REQUIRES
, SPECIAL_LOGGER_SOCKET
, NULL
, true)) < 0)
576 const char *unit_description(Unit
*u
) {
579 if (u
->meta
.description
)
580 return u
->meta
.description
;
582 return strna(u
->meta
.id
);
585 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
593 timestamp1
[FORMAT_TIMESTAMP_MAX
],
594 timestamp2
[FORMAT_TIMESTAMP_MAX
],
595 timestamp3
[FORMAT_TIMESTAMP_MAX
],
596 timestamp4
[FORMAT_TIMESTAMP_MAX
],
597 timespan
[FORMAT_TIMESPAN_MAX
];
601 assert(u
->meta
.type
>= 0);
605 p2
= strappend(prefix
, "\t");
606 prefix2
= p2
? p2
: prefix
;
610 "%s\tDescription: %s\n"
612 "%s\tUnit Load State: %s\n"
613 "%s\tUnit Active State: %s\n"
614 "%s\tInactive Exit Timestamp: %s\n"
615 "%s\tActive Enter Timestamp: %s\n"
616 "%s\tActive Exit Timestamp: %s\n"
617 "%s\tInactive Enter Timestamp: %s\n"
618 "%s\tGC Check Good: %s\n"
619 "%s\tNeed Daemon Reload: %s\n",
621 prefix
, unit_description(u
),
622 prefix
, strna(u
->meta
.instance
),
623 prefix
, unit_load_state_to_string(u
->meta
.load_state
),
624 prefix
, unit_active_state_to_string(unit_active_state(u
)),
625 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->meta
.inactive_exit_timestamp
.realtime
)),
626 prefix
, strna(format_timestamp(timestamp2
, sizeof(timestamp2
), u
->meta
.active_enter_timestamp
.realtime
)),
627 prefix
, strna(format_timestamp(timestamp3
, sizeof(timestamp3
), u
->meta
.active_exit_timestamp
.realtime
)),
628 prefix
, strna(format_timestamp(timestamp4
, sizeof(timestamp4
), u
->meta
.inactive_enter_timestamp
.realtime
)),
629 prefix
, yes_no(unit_check_gc(u
)),
630 prefix
, yes_no(unit_need_daemon_reload(u
)));
632 SET_FOREACH(t
, u
->meta
.names
, i
)
633 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
635 if ((following
= unit_following(u
)))
636 fprintf(f
, "%s\tFollowing: %s\n", prefix
, following
->meta
.id
);
638 if (u
->meta
.fragment_path
)
639 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->meta
.fragment_path
);
641 if (u
->meta
.job_timeout
> 0)
642 fprintf(f
, "%s\tJob Timeout: %s\n", prefix
, format_timespan(timespan
, sizeof(timespan
), u
->meta
.job_timeout
));
644 condition_dump_list(u
->meta
.conditions
, f
, prefix
);
646 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
649 SET_FOREACH(other
, u
->meta
.dependencies
[d
], i
)
650 fprintf(f
, "%s\t%s: %s\n", prefix
, unit_dependency_to_string(d
), other
->meta
.id
);
653 if (u
->meta
.load_state
== UNIT_LOADED
) {
655 "%s\tStopWhenUnneeded: %s\n"
656 "%s\tRefuseManualStart: %s\n"
657 "%s\tRefuseManualStop: %s\n"
658 "%s\tDefaultDependencies: %s\n",
659 prefix
, yes_no(u
->meta
.stop_when_unneeded
),
660 prefix
, yes_no(u
->meta
.refuse_manual_start
),
661 prefix
, yes_no(u
->meta
.refuse_manual_stop
),
662 prefix
, yes_no(u
->meta
.default_dependencies
));
664 LIST_FOREACH(by_unit
, b
, u
->meta
.cgroup_bondings
)
665 fprintf(f
, "%s\tControlGroup: %s:%s\n",
666 prefix
, b
->controller
, b
->path
);
668 if (UNIT_VTABLE(u
)->dump
)
669 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
671 } else if (u
->meta
.load_state
== UNIT_MERGED
)
673 "%s\tMerged into: %s\n",
674 prefix
, u
->meta
.merged_into
->meta
.id
);
675 else if (u
->meta
.load_state
== UNIT_ERROR
)
676 fprintf(f
, "%s\tLoad Error Code: %s\n", prefix
, strerror(-u
->meta
.load_error
));
680 job_dump(u
->meta
.job
, f
, prefix2
);
685 /* Common implementation for multiple backends */
686 int unit_load_fragment_and_dropin(Unit
*u
) {
691 /* Load a .service file */
692 if ((r
= unit_load_fragment(u
)) < 0)
695 if (u
->meta
.load_state
== UNIT_STUB
)
698 /* Load drop-in directory data */
699 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
705 /* Common implementation for multiple backends */
706 int unit_load_fragment_and_dropin_optional(Unit
*u
) {
711 /* Same as unit_load_fragment_and_dropin(), but whether
712 * something can be loaded or not doesn't matter. */
714 /* Load a .service file */
715 if ((r
= unit_load_fragment(u
)) < 0)
718 if (u
->meta
.load_state
== UNIT_STUB
)
719 u
->meta
.load_state
= UNIT_LOADED
;
721 /* Load drop-in directory data */
722 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
728 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
732 if (target
->meta
.type
!= UNIT_TARGET
)
735 /* Only add the dependency if boths units are loaded, so that
736 * that loop check below is reliable */
737 if (u
->meta
.load_state
!= UNIT_LOADED
||
738 target
->meta
.load_state
!= UNIT_LOADED
)
741 /* Don't create loops */
742 if (set_get(target
->meta
.dependencies
[UNIT_BEFORE
], u
))
745 return unit_add_dependency(target
, UNIT_AFTER
, u
, true);
748 static int unit_add_default_dependencies(Unit
*u
) {
755 SET_FOREACH(target
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
756 if ((r
= unit_add_default_target_dependency(u
, target
)) < 0)
759 SET_FOREACH(target
, u
->meta
.dependencies
[UNIT_REQUIRED_BY_OVERRIDABLE
], i
)
760 if ((r
= unit_add_default_target_dependency(u
, target
)) < 0)
763 SET_FOREACH(target
, u
->meta
.dependencies
[UNIT_WANTED_BY
], i
)
764 if ((r
= unit_add_default_target_dependency(u
, target
)) < 0)
767 SET_FOREACH(target
, u
->meta
.dependencies
[UNIT_BOUND_BY
], i
)
768 if ((r
= unit_add_default_target_dependency(u
, target
)) < 0)
774 int unit_load(Unit
*u
) {
779 if (u
->meta
.in_load_queue
) {
780 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
781 u
->meta
.in_load_queue
= false;
784 if (u
->meta
.type
== _UNIT_TYPE_INVALID
)
787 if (u
->meta
.load_state
!= UNIT_STUB
)
790 if (UNIT_VTABLE(u
)->load
)
791 if ((r
= UNIT_VTABLE(u
)->load(u
)) < 0)
794 if (u
->meta
.load_state
== UNIT_STUB
) {
799 if (u
->meta
.load_state
== UNIT_LOADED
&&
800 u
->meta
.default_dependencies
)
801 if ((r
= unit_add_default_dependencies(u
)) < 0)
804 assert((u
->meta
.load_state
!= UNIT_MERGED
) == !u
->meta
.merged_into
);
806 unit_add_to_dbus_queue(unit_follow_merge(u
));
807 unit_add_to_gc_queue(u
);
812 u
->meta
.load_state
= UNIT_ERROR
;
813 u
->meta
.load_error
= r
;
814 unit_add_to_dbus_queue(u
);
816 log_debug("Failed to load configuration for %s: %s", u
->meta
.id
, strerror(-r
));
822 * -EBADR: This unit type does not support starting.
823 * -EALREADY: Unit is already started.
824 * -EAGAIN: An operation is already in progress. Retry later.
825 * -ECANCELED: Too many requests for now.
827 int unit_start(Unit
*u
) {
828 UnitActiveState state
;
832 if (u
->meta
.load_state
!= UNIT_LOADED
)
835 /* If this is already (being) started, then this will
836 * succeed. Note that this will even succeed if this unit is
837 * not startable by the user. This is relied on to detect when
838 * we need to wait for units and when waiting is finished. */
839 state
= unit_active_state(u
);
840 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
843 /* If it is stopped, but we cannot start it, then fail */
844 if (!UNIT_VTABLE(u
)->start
)
847 /* If the conditions failed, don't do anything at all */
848 if (!condition_test_list(u
->meta
.conditions
)) {
849 log_debug("Starting of %s requested but condition failed. Ignoring.", u
->meta
.id
);
853 /* We don't suppress calls to ->start() here when we are
854 * already starting, to allow this request to be used as a
855 * "hurry up" call, for example when the unit is in some "auto
856 * restart" state where it waits for a holdoff timer to elapse
857 * before it will start again. */
859 unit_add_to_dbus_queue(u
);
861 unit_status_printf(u
, "Starting %s...\n", unit_description(u
));
863 return UNIT_VTABLE(u
)->start(u
);
866 bool unit_can_start(Unit
*u
) {
869 return !!UNIT_VTABLE(u
)->start
;
872 bool unit_can_isolate(Unit
*u
) {
875 return unit_can_start(u
) &&
876 u
->meta
.allow_isolate
;
880 * -EBADR: This unit type does not support stopping.
881 * -EALREADY: Unit is already stopped.
882 * -EAGAIN: An operation is already in progress. Retry later.
884 int unit_stop(Unit
*u
) {
885 UnitActiveState state
;
889 state
= unit_active_state(u
);
890 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
893 if (!UNIT_VTABLE(u
)->stop
)
896 unit_add_to_dbus_queue(u
);
898 unit_status_printf(u
, "Stopping %s...\n", unit_description(u
));
900 return UNIT_VTABLE(u
)->stop(u
);
904 * -EBADR: This unit type does not support reloading.
905 * -ENOEXEC: Unit is not started.
906 * -EAGAIN: An operation is already in progress. Retry later.
908 int unit_reload(Unit
*u
) {
909 UnitActiveState state
;
913 if (u
->meta
.load_state
!= UNIT_LOADED
)
916 if (!unit_can_reload(u
))
919 state
= unit_active_state(u
);
920 if (state
== UNIT_RELOADING
)
923 if (state
!= UNIT_ACTIVE
)
926 unit_add_to_dbus_queue(u
);
927 return UNIT_VTABLE(u
)->reload(u
);
930 bool unit_can_reload(Unit
*u
) {
933 if (!UNIT_VTABLE(u
)->reload
)
936 if (!UNIT_VTABLE(u
)->can_reload
)
939 return UNIT_VTABLE(u
)->can_reload(u
);
942 static void unit_check_unneeded(Unit
*u
) {
948 /* If this service shall be shut down when unneeded then do
951 if (!u
->meta
.stop_when_unneeded
)
954 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
957 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
958 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
961 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY_OVERRIDABLE
], i
)
962 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
965 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTED_BY
], i
)
966 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
969 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_BOUND_BY
], i
)
970 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
973 log_info("Service %s is not needed anymore. Stopping.", u
->meta
.id
);
975 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
976 manager_add_job(u
->meta
.manager
, JOB_STOP
, u
, JOB_FAIL
, true, NULL
, NULL
);
979 static void retroactively_start_dependencies(Unit
*u
) {
984 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
986 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
987 if (!set_get(u
->meta
.dependencies
[UNIT_AFTER
], other
) &&
988 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
989 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
, NULL
);
991 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_BIND_TO
], i
)
992 if (!set_get(u
->meta
.dependencies
[UNIT_AFTER
], other
) &&
993 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
994 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
, NULL
);
996 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
997 if (!set_get(u
->meta
.dependencies
[UNIT_AFTER
], other
) &&
998 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
999 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
, NULL
);
1001 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
1002 if (!set_get(u
->meta
.dependencies
[UNIT_AFTER
], other
) &&
1003 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1004 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1006 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
1007 if (!set_get(u
->meta
.dependencies
[UNIT_AFTER
], other
) &&
1008 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1009 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
, NULL
);
1011 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
1012 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1013 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1015 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_CONFLICTED_BY
], i
)
1016 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1017 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1020 static void retroactively_stop_dependencies(Unit
*u
) {
1025 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
1027 /* Pull down units which are bound to us recursively if enabled */
1028 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_BOUND_BY
], i
)
1029 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1030 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1032 /* Garbage collect services that might not be needed anymore, if enabled */
1033 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
1034 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1035 unit_check_unneeded(other
);
1036 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
1037 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1038 unit_check_unneeded(other
);
1039 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
1040 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1041 unit_check_unneeded(other
);
1042 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
1043 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1044 unit_check_unneeded(other
);
1045 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE_OVERRIDABLE
], i
)
1046 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1047 unit_check_unneeded(other
);
1048 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_BIND_TO
], i
)
1049 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1050 unit_check_unneeded(other
);
1053 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
) {
1058 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
1059 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
1061 /* Note that this is called for all low-level state changes,
1062 * even if they might map to the same high-level
1063 * UnitActiveState! That means that ns == os is OK an expected
1064 * behaviour here. For example: if a mount point is remounted
1065 * this function will be called too! */
1067 dual_timestamp_get(&ts
);
1069 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
1070 u
->meta
.inactive_exit_timestamp
= ts
;
1071 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
1072 u
->meta
.inactive_enter_timestamp
= ts
;
1074 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1075 u
->meta
.active_enter_timestamp
= ts
;
1076 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1077 u
->meta
.active_exit_timestamp
= ts
;
1079 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1080 cgroup_bonding_trim_list(u
->meta
.cgroup_bondings
, true);
1082 timer_unit_notify(u
, ns
);
1083 path_unit_notify(u
, ns
);
1088 if (u
->meta
.job
->state
== JOB_WAITING
)
1090 /* So we reached a different state for this
1091 * job. Let's see if we can run it now if it
1092 * failed previously due to EAGAIN. */
1093 job_add_to_run_queue(u
->meta
.job
);
1095 /* Let's check whether this state change constitutes a
1096 * finished job, or maybe cotradicts a running job and
1097 * hence needs to invalidate jobs. */
1099 switch (u
->meta
.job
->type
) {
1102 case JOB_VERIFY_ACTIVE
:
1104 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1105 job_finish_and_invalidate(u
->meta
.job
, true);
1106 else if (u
->meta
.job
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
1109 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1110 job_finish_and_invalidate(u
->meta
.job
, ns
!= UNIT_FAILED
);
1116 case JOB_RELOAD_OR_START
:
1118 if (u
->meta
.job
->state
== JOB_RUNNING
) {
1119 if (ns
== UNIT_ACTIVE
)
1120 job_finish_and_invalidate(u
->meta
.job
, true);
1121 else if (ns
!= UNIT_ACTIVATING
&& ns
!= UNIT_RELOADING
) {
1124 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1125 job_finish_and_invalidate(u
->meta
.job
, ns
!= UNIT_FAILED
);
1133 case JOB_TRY_RESTART
:
1135 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1136 job_finish_and_invalidate(u
->meta
.job
, true);
1137 else if (u
->meta
.job
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
1139 job_finish_and_invalidate(u
->meta
.job
, false);
1145 assert_not_reached("Job type unknown");
1151 /* If this state change happened without being requested by a
1152 * job, then let's retroactively start or stop
1153 * dependencies. We skip that step when deserializing, since
1154 * we don't want to create any additional jobs just because
1155 * something is already activated. */
1157 if (unexpected
&& u
->meta
.manager
->n_deserializing
<= 0) {
1158 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
1159 retroactively_start_dependencies(u
);
1160 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
1161 retroactively_stop_dependencies(u
);
1164 if (ns
!= os
&& ns
== UNIT_FAILED
) {
1168 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_ON_FAILURE
], i
)
1169 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1171 log_notice("Unit %s entered failed state.", u
->meta
.id
);
1174 /* Some names are special */
1175 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
1176 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
))
1177 /* The bus just might have become available,
1178 * hence try to connect to it, if we aren't
1180 bus_init(u
->meta
.manager
);
1182 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
))
1183 /* The syslog daemon just might have become
1184 * available, hence try to connect to it, if
1185 * we aren't yet connected. */
1188 if (u
->meta
.type
== UNIT_SERVICE
&&
1189 !UNIT_IS_ACTIVE_OR_RELOADING(os
)) {
1190 /* Write audit record if we have just finished starting up */
1191 manager_send_unit_audit(u
->meta
.manager
, u
, AUDIT_SERVICE_START
, true);
1192 u
->meta
.in_audit
= true;
1195 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
))
1196 manager_send_unit_plymouth(u
->meta
.manager
, u
);
1200 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
))
1201 /* The syslog daemon might just have
1202 * terminated, hence try to disconnect from
1206 /* We don't care about D-Bus here, since we'll get an
1207 * asynchronous notification for it anyway. */
1209 if (u
->meta
.type
== UNIT_SERVICE
&&
1210 UNIT_IS_INACTIVE_OR_FAILED(ns
) &&
1211 !UNIT_IS_INACTIVE_OR_FAILED(os
)) {
1213 /* Hmm, if there was no start record written
1214 * write it now, so that we always have a nice
1216 if (!u
->meta
.in_audit
) {
1217 manager_send_unit_audit(u
->meta
.manager
, u
, AUDIT_SERVICE_START
, ns
== UNIT_INACTIVE
);
1219 if (ns
== UNIT_INACTIVE
)
1220 manager_send_unit_audit(u
->meta
.manager
, u
, AUDIT_SERVICE_STOP
, true);
1222 /* Write audit record if we have just finished shutting down */
1223 manager_send_unit_audit(u
->meta
.manager
, u
, AUDIT_SERVICE_STOP
, ns
== UNIT_INACTIVE
);
1225 u
->meta
.in_audit
= false;
1229 /* Maybe we finished startup and are now ready for being
1230 * stopped because unneeded? */
1231 unit_check_unneeded(u
);
1233 unit_add_to_dbus_queue(u
);
1234 unit_add_to_gc_queue(u
);
1237 int unit_watch_fd(Unit
*u
, int fd
, uint32_t events
, Watch
*w
) {
1238 struct epoll_event ev
;
1243 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_FD
&& w
->fd
== fd
&& w
->data
.unit
== u
));
1249 if (epoll_ctl(u
->meta
.manager
->epoll_fd
,
1250 w
->type
== WATCH_INVALID
? EPOLL_CTL_ADD
: EPOLL_CTL_MOD
,
1262 void unit_unwatch_fd(Unit
*u
, Watch
*w
) {
1266 if (w
->type
== WATCH_INVALID
)
1269 assert(w
->type
== WATCH_FD
);
1270 assert(w
->data
.unit
== u
);
1271 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1274 w
->type
= WATCH_INVALID
;
1275 w
->data
.unit
= NULL
;
1278 int unit_watch_pid(Unit
*u
, pid_t pid
) {
1282 /* Watch a specific PID. We only support one unit watching
1283 * each PID for now. */
1285 return hashmap_put(u
->meta
.manager
->watch_pids
, LONG_TO_PTR(pid
), u
);
1288 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
1292 hashmap_remove_value(u
->meta
.manager
->watch_pids
, LONG_TO_PTR(pid
), u
);
1295 int unit_watch_timer(Unit
*u
, usec_t delay
, Watch
*w
) {
1296 struct itimerspec its
;
1302 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_UNIT_TIMER
&& w
->data
.unit
== u
));
1304 /* This will try to reuse the old timer if there is one */
1306 if (w
->type
== WATCH_UNIT_TIMER
) {
1307 assert(w
->data
.unit
== u
);
1312 } else if (w
->type
== WATCH_INVALID
) {
1315 if ((fd
= timerfd_create(CLOCK_MONOTONIC
, TFD_NONBLOCK
|TFD_CLOEXEC
)) < 0)
1318 assert_not_reached("Invalid watch type");
1323 /* Set absolute time in the past, but not 0, since we
1324 * don't want to disarm the timer */
1325 its
.it_value
.tv_sec
= 0;
1326 its
.it_value
.tv_nsec
= 1;
1328 flags
= TFD_TIMER_ABSTIME
;
1330 timespec_store(&its
.it_value
, delay
);
1334 /* This will also flush the elapse counter */
1335 if (timerfd_settime(fd
, flags
, &its
, NULL
) < 0)
1338 if (w
->type
== WATCH_INVALID
) {
1339 struct epoll_event ev
;
1343 ev
.events
= EPOLLIN
;
1345 if (epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_ADD
, fd
, &ev
) < 0)
1349 w
->type
= WATCH_UNIT_TIMER
;
1357 close_nointr_nofail(fd
);
1362 void unit_unwatch_timer(Unit
*u
, Watch
*w
) {
1366 if (w
->type
== WATCH_INVALID
)
1369 assert(w
->type
== WATCH_UNIT_TIMER
);
1370 assert(w
->data
.unit
== u
);
1373 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1374 close_nointr_nofail(w
->fd
);
1377 w
->type
= WATCH_INVALID
;
1378 w
->data
.unit
= NULL
;
1381 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
1383 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
1387 case JOB_VERIFY_ACTIVE
:
1393 case JOB_TRY_RESTART
:
1394 return unit_can_start(u
);
1397 return unit_can_reload(u
);
1399 case JOB_RELOAD_OR_START
:
1400 return unit_can_reload(u
) && unit_can_start(u
);
1403 assert_not_reached("Invalid job type");
1407 int unit_add_dependency(Unit
*u
, UnitDependency d
, Unit
*other
, bool add_reference
) {
1409 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
1410 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
1411 [UNIT_REQUIRES_OVERRIDABLE
] = UNIT_REQUIRED_BY_OVERRIDABLE
,
1412 [UNIT_WANTS
] = UNIT_WANTED_BY
,
1413 [UNIT_REQUISITE
] = UNIT_REQUIRED_BY
,
1414 [UNIT_REQUISITE_OVERRIDABLE
] = UNIT_REQUIRED_BY_OVERRIDABLE
,
1415 [UNIT_BIND_TO
] = UNIT_BOUND_BY
,
1416 [UNIT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1417 [UNIT_REQUIRED_BY_OVERRIDABLE
] = _UNIT_DEPENDENCY_INVALID
,
1418 [UNIT_WANTED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1419 [UNIT_BOUND_BY
] = UNIT_BIND_TO
,
1420 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
1421 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
1422 [UNIT_BEFORE
] = UNIT_AFTER
,
1423 [UNIT_AFTER
] = UNIT_BEFORE
,
1424 [UNIT_ON_FAILURE
] = _UNIT_DEPENDENCY_INVALID
,
1425 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
1426 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
1428 int r
, q
= 0, v
= 0, w
= 0;
1431 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
1434 u
= unit_follow_merge(u
);
1435 other
= unit_follow_merge(other
);
1437 /* We won't allow dependencies on ourselves. We will not
1438 * consider them an error however. */
1442 if (UNIT_VTABLE(u
)->no_requires
&&
1443 (d
== UNIT_REQUIRES
||
1444 d
== UNIT_REQUIRES_OVERRIDABLE
||
1445 d
== UNIT_REQUISITE
||
1446 d
== UNIT_REQUISITE_OVERRIDABLE
||
1447 d
== UNIT_BIND_TO
)) {
1451 if ((r
= set_ensure_allocated(&u
->meta
.dependencies
[d
], trivial_hash_func
, trivial_compare_func
)) < 0)
1454 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
)
1455 if ((r
= set_ensure_allocated(&other
->meta
.dependencies
[inverse_table
[d
]], trivial_hash_func
, trivial_compare_func
)) < 0)
1459 if ((r
= set_ensure_allocated(&u
->meta
.dependencies
[UNIT_REFERENCES
], trivial_hash_func
, trivial_compare_func
)) < 0 ||
1460 (r
= set_ensure_allocated(&other
->meta
.dependencies
[UNIT_REFERENCED_BY
], trivial_hash_func
, trivial_compare_func
)) < 0)
1463 if ((q
= set_put(u
->meta
.dependencies
[d
], other
)) < 0)
1466 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
)
1467 if ((v
= set_put(other
->meta
.dependencies
[inverse_table
[d
]], u
)) < 0) {
1472 if (add_reference
) {
1473 if ((w
= set_put(u
->meta
.dependencies
[UNIT_REFERENCES
], other
)) < 0) {
1478 if ((r
= set_put(other
->meta
.dependencies
[UNIT_REFERENCED_BY
], u
)) < 0)
1482 unit_add_to_dbus_queue(u
);
1487 set_remove(u
->meta
.dependencies
[d
], other
);
1490 set_remove(other
->meta
.dependencies
[inverse_table
[d
]], u
);
1493 set_remove(u
->meta
.dependencies
[UNIT_REFERENCES
], other
);
1498 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
) {
1503 if ((r
= unit_add_dependency(u
, d
, other
, add_reference
)) < 0)
1506 if ((r
= unit_add_dependency(u
, e
, other
, add_reference
)) < 0)
1512 static const char *resolve_template(Unit
*u
, const char *name
, const char*path
, char **p
) {
1516 assert(name
|| path
);
1519 name
= file_name_from_path(path
);
1521 if (!unit_name_is_template(name
)) {
1526 if (u
->meta
.instance
)
1527 s
= unit_name_replace_instance(name
, u
->meta
.instance
);
1531 if (!(i
= unit_name_to_prefix(u
->meta
.id
)))
1534 s
= unit_name_replace_instance(name
, i
);
1545 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, const char *path
, bool add_reference
) {
1551 assert(name
|| path
);
1553 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1556 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, NULL
, &other
)) < 0)
1559 r
= unit_add_dependency(u
, d
, other
, add_reference
);
1566 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, const char *path
, bool add_reference
) {
1572 assert(name
|| path
);
1574 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1577 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, NULL
, &other
)) < 0)
1580 r
= unit_add_two_dependencies(u
, d
, e
, other
, add_reference
);
1587 int unit_add_dependency_by_name_inverse(Unit
*u
, UnitDependency d
, const char *name
, const char *path
, bool add_reference
) {
1593 assert(name
|| path
);
1595 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1598 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, NULL
, &other
)) < 0)
1601 r
= unit_add_dependency(other
, d
, u
, add_reference
);
1608 int unit_add_two_dependencies_by_name_inverse(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, const char *path
, bool add_reference
) {
1614 assert(name
|| path
);
1616 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1619 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, NULL
, &other
)) < 0)
1622 if ((r
= unit_add_two_dependencies(other
, d
, e
, u
, add_reference
)) < 0)
1630 int set_unit_path(const char *p
) {
1634 /* This is mostly for debug purposes */
1636 if (path_is_absolute(p
)) {
1637 if (!(c
= strdup(p
)))
1640 if (!(cwd
= get_current_dir_name()))
1643 r
= asprintf(&c
, "%s/%s", cwd
, p
);
1650 if (setenv("SYSTEMD_UNIT_PATH", c
, 0) < 0) {
1659 char *unit_dbus_path(Unit
*u
) {
1667 if (!(e
= bus_path_escape(u
->meta
.id
)))
1670 p
= strappend("/org/freedesktop/systemd1/unit/", e
);
1676 int unit_add_cgroup(Unit
*u
, CGroupBonding
*b
) {
1686 if (!(b
->controller
= strdup(SYSTEMD_CGROUP_CONTROLLER
)))
1689 /* Ensure this hasn't been added yet */
1692 l
= hashmap_get(u
->meta
.manager
->cgroup_bondings
, b
->path
);
1693 LIST_PREPEND(CGroupBonding
, by_path
, l
, b
);
1695 if ((r
= hashmap_replace(u
->meta
.manager
->cgroup_bondings
, b
->path
, l
)) < 0) {
1696 LIST_REMOVE(CGroupBonding
, by_path
, l
, b
);
1700 LIST_PREPEND(CGroupBonding
, by_unit
, u
->meta
.cgroup_bondings
, b
);
1706 static char *default_cgroup_path(Unit
*u
) {
1712 if (u
->meta
.instance
) {
1715 if (!(t
= unit_name_template(u
->meta
.id
)))
1718 r
= asprintf(&p
, "%s/%s/%s", u
->meta
.manager
->cgroup_hierarchy
, t
, u
->meta
.instance
);
1721 r
= asprintf(&p
, "%s/%s", u
->meta
.manager
->cgroup_hierarchy
, u
->meta
.id
);
1723 return r
< 0 ? NULL
: p
;
1726 int unit_add_cgroup_from_text(Unit
*u
, const char *name
) {
1727 char *controller
= NULL
, *path
= NULL
;
1728 CGroupBonding
*b
= NULL
;
1734 if ((r
= cg_split_spec(name
, &controller
, &path
)) < 0)
1738 path
= default_cgroup_path(u
);
1741 controller
= strdup(SYSTEMD_CGROUP_CONTROLLER
);
1743 if (!path
|| !controller
) {
1750 if (cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, controller
)) {
1755 if (!(b
= new0(CGroupBonding
, 1))) {
1760 b
->controller
= controller
;
1763 b
->clean_up
= false;
1765 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1778 int unit_add_default_cgroup(Unit
*u
) {
1784 /* Adds in the default cgroup data, if it wasn't specified yet */
1786 if (unit_get_default_cgroup(u
))
1789 if (!(b
= new0(CGroupBonding
, 1)))
1792 if (!(b
->path
= default_cgroup_path(u
)))
1798 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1805 free(b
->controller
);
1811 CGroupBonding
* unit_get_default_cgroup(Unit
*u
) {
1814 return cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, SYSTEMD_CGROUP_CONTROLLER
);
1817 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
1825 if (!(t
= unit_name_change_suffix(u
->meta
.id
, type
)))
1828 assert(!unit_has_name(u
, t
));
1830 r
= manager_load_unit(u
->meta
.manager
, t
, NULL
, NULL
, _found
);
1833 assert(r
< 0 || *_found
!= u
);
1838 int unit_get_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
1846 if (!(t
= unit_name_change_suffix(u
->meta
.id
, type
)))
1849 assert(!unit_has_name(u
, t
));
1851 found
= manager_get_unit(u
->meta
.manager
, t
);
1861 static char *specifier_prefix_and_instance(char specifier
, void *data
, void *userdata
) {
1865 return unit_name_to_prefix_and_instance(u
->meta
.id
);
1868 static char *specifier_prefix(char specifier
, void *data
, void *userdata
) {
1872 return unit_name_to_prefix(u
->meta
.id
);
1875 static char *specifier_prefix_unescaped(char specifier
, void *data
, void *userdata
) {
1881 if (!(p
= unit_name_to_prefix(u
->meta
.id
)))
1884 r
= unit_name_unescape(p
);
1890 static char *specifier_instance_unescaped(char specifier
, void *data
, void *userdata
) {
1894 if (u
->meta
.instance
)
1895 return unit_name_unescape(u
->meta
.instance
);
1900 static char *specifier_filename(char specifier
, void *data
, void *userdata
) {
1904 if (u
->meta
.instance
)
1905 return unit_name_path_unescape(u
->meta
.instance
);
1907 return unit_name_to_path(u
->meta
.instance
);
1910 char *unit_name_printf(Unit
*u
, const char* format
) {
1913 * This will use the passed string as format string and
1914 * replace the following specifiers:
1916 * %n: the full id of the unit (foo@bar.waldo)
1917 * %N: the id of the unit without the suffix (foo@bar)
1918 * %p: the prefix (foo)
1919 * %i: the instance (bar)
1922 const Specifier table
[] = {
1923 { 'n', specifier_string
, u
->meta
.id
},
1924 { 'N', specifier_prefix_and_instance
, NULL
},
1925 { 'p', specifier_prefix
, NULL
},
1926 { 'i', specifier_string
, u
->meta
.instance
},
1933 return specifier_printf(format
, table
, u
);
1936 char *unit_full_printf(Unit
*u
, const char *format
) {
1938 /* This is similar to unit_name_printf() but also supports
1941 const Specifier table
[] = {
1942 { 'n', specifier_string
, u
->meta
.id
},
1943 { 'N', specifier_prefix_and_instance
, NULL
},
1944 { 'p', specifier_prefix
, NULL
},
1945 { 'P', specifier_prefix_unescaped
, NULL
},
1946 { 'i', specifier_string
, u
->meta
.instance
},
1947 { 'I', specifier_instance_unescaped
, NULL
},
1948 { 'f', specifier_filename
, NULL
},
1955 return specifier_printf(format
, table
, u
);
1958 char **unit_full_printf_strv(Unit
*u
, char **l
) {
1962 /* Applies unit_full_printf to every entry in l */
1967 if (!(r
= new(char*, n
+1)))
1970 for (i
= l
, j
= r
; *i
; i
++, j
++)
1971 if (!(*j
= unit_full_printf(u
, *i
)))
1987 int unit_watch_bus_name(Unit
*u
, const char *name
) {
1991 /* Watch a specific name on the bus. We only support one unit
1992 * watching each name for now. */
1994 return hashmap_put(u
->meta
.manager
->watch_bus
, name
, u
);
1997 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
2001 hashmap_remove_value(u
->meta
.manager
->watch_bus
, name
, u
);
2004 bool unit_can_serialize(Unit
*u
) {
2007 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
2010 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
2017 if (!unit_can_serialize(u
))
2020 if ((r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
)) < 0)
2024 unit_serialize_item(u
, f
, "job", job_type_to_string(u
->meta
.job
->type
));
2026 dual_timestamp_serialize(f
, "inactive-exit-timestamp", &u
->meta
.inactive_exit_timestamp
);
2027 dual_timestamp_serialize(f
, "active-enter-timestamp", &u
->meta
.active_enter_timestamp
);
2028 dual_timestamp_serialize(f
, "active-exit-timestamp", &u
->meta
.active_exit_timestamp
);
2029 dual_timestamp_serialize(f
, "inactive-enter-timestamp", &u
->meta
.inactive_enter_timestamp
);
2036 void unit_serialize_item_format(Unit
*u
, FILE *f
, const char *key
, const char *format
, ...) {
2047 va_start(ap
, format
);
2048 vfprintf(f
, format
, ap
);
2054 void unit_serialize_item(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
2060 fprintf(f
, "%s=%s\n", key
, value
);
2063 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
2070 if (!unit_can_serialize(u
))
2074 char line
[1024], *l
, *v
;
2077 if (!fgets(line
, sizeof(line
), f
)) {
2090 k
= strcspn(l
, "=");
2098 if (streq(l
, "job")) {
2101 if ((type
= job_type_from_string(v
)) < 0)
2102 log_debug("Failed to parse job type value %s", v
);
2104 u
->meta
.deserialized_job
= type
;
2107 } else if (streq(l
, "inactive-exit-timestamp")) {
2108 dual_timestamp_deserialize(v
, &u
->meta
.inactive_exit_timestamp
);
2110 } else if (streq(l
, "active-enter-timestamp")) {
2111 dual_timestamp_deserialize(v
, &u
->meta
.active_enter_timestamp
);
2113 } else if (streq(l
, "active-exit-timestamp")) {
2114 dual_timestamp_deserialize(v
, &u
->meta
.active_exit_timestamp
);
2116 } else if (streq(l
, "inactive-enter-timestamp")) {
2117 dual_timestamp_deserialize(v
, &u
->meta
.inactive_enter_timestamp
);
2121 if ((r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
)) < 0)
2126 int unit_add_node_link(Unit
*u
, const char *what
, bool wants
) {
2136 /* Adds in links to the device node that this unit is based on */
2138 if (!is_device_path(what
))
2141 if (!(e
= unit_name_build_escape(what
+1, NULL
, ".device")))
2144 r
= manager_load_unit(u
->meta
.manager
, e
, NULL
, NULL
, &device
);
2150 if ((r
= unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_BIND_TO
, device
, true)) < 0)
2154 if ((r
= unit_add_dependency(device
, UNIT_WANTS
, u
, false)) < 0)
2160 int unit_coldplug(Unit
*u
) {
2165 if (UNIT_VTABLE(u
)->coldplug
)
2166 if ((r
= UNIT_VTABLE(u
)->coldplug(u
)) < 0)
2169 if (u
->meta
.deserialized_job
>= 0) {
2170 if ((r
= manager_add_job(u
->meta
.manager
, u
->meta
.deserialized_job
, u
, JOB_FAIL
, false, NULL
, NULL
)) < 0)
2173 u
->meta
.deserialized_job
= _JOB_TYPE_INVALID
;
2179 void unit_status_printf(Unit
*u
, const char *format
, ...) {
2185 if (!UNIT_VTABLE(u
)->show_status
)
2188 if (u
->meta
.manager
->running_as
!= MANAGER_SYSTEM
)
2191 if (!u
->meta
.manager
->show_status
)
2194 if (!manager_is_booting_or_shutting_down(u
->meta
.manager
))
2197 va_start(ap
, format
);
2198 status_vprintf(format
, ap
);
2202 bool unit_need_daemon_reload(Unit
*u
) {
2207 if (!u
->meta
.fragment_path
)
2211 if (stat(u
->meta
.fragment_path
, &st
) < 0)
2212 /* What, cannot access this anymore? */
2216 u
->meta
.fragment_mtime
&&
2217 timespec_load(&st
.st_mtim
) != u
->meta
.fragment_mtime
;
2220 void unit_reset_failed(Unit
*u
) {
2223 if (UNIT_VTABLE(u
)->reset_failed
)
2224 UNIT_VTABLE(u
)->reset_failed(u
);
2227 Unit
*unit_following(Unit
*u
) {
2230 if (UNIT_VTABLE(u
)->following
)
2231 return UNIT_VTABLE(u
)->following(u
);
2236 bool unit_pending_inactive(Unit
*u
) {
2239 /* Returns true if the unit is inactive or going down */
2241 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
2244 if (u
->meta
.job
&& u
->meta
.job
->type
== JOB_STOP
)
2250 bool unit_pending_active(Unit
*u
) {
2253 /* Returns true if the unit is inactive or going down */
2255 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
2259 (u
->meta
.job
->type
== JOB_START
||
2260 u
->meta
.job
->type
== JOB_RELOAD_OR_START
||
2261 u
->meta
.job
->type
== JOB_RESTART
))
2267 UnitType
unit_name_to_type(const char *n
) {
2272 for (t
= 0; t
< _UNIT_TYPE_MAX
; t
++)
2273 if (endswith(n
, unit_vtable
[t
]->suffix
))
2276 return _UNIT_TYPE_INVALID
;
2279 bool unit_name_is_valid(const char *n
, bool template_ok
) {
2282 t
= unit_name_to_type(n
);
2283 if (t
< 0 || t
>= _UNIT_TYPE_MAX
)
2286 return unit_name_is_valid_no_type(n
, template_ok
);
2289 int unit_kill(Unit
*u
, KillWho w
, KillMode m
, int signo
, DBusError
*error
) {
2291 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
2292 assert(m
>= 0 && m
< _KILL_MODE_MAX
);
2294 assert(signo
< _NSIG
);
2299 if (!UNIT_VTABLE(u
)->kill
)
2302 return UNIT_VTABLE(u
)->kill(u
, w
, m
, signo
, error
);
2305 static const char* const unit_load_state_table
[_UNIT_LOAD_STATE_MAX
] = {
2306 [UNIT_STUB
] = "stub",
2307 [UNIT_LOADED
] = "loaded",
2308 [UNIT_ERROR
] = "error",
2309 [UNIT_MERGED
] = "merged",
2310 [UNIT_MASKED
] = "masked"
2313 DEFINE_STRING_TABLE_LOOKUP(unit_load_state
, UnitLoadState
);
2315 static const char* const unit_active_state_table
[_UNIT_ACTIVE_STATE_MAX
] = {
2316 [UNIT_ACTIVE
] = "active",
2317 [UNIT_RELOADING
] = "reloading",
2318 [UNIT_INACTIVE
] = "inactive",
2319 [UNIT_FAILED
] = "failed",
2320 [UNIT_ACTIVATING
] = "activating",
2321 [UNIT_DEACTIVATING
] = "deactivating"
2324 DEFINE_STRING_TABLE_LOOKUP(unit_active_state
, UnitActiveState
);
2326 static const char* const unit_dependency_table
[_UNIT_DEPENDENCY_MAX
] = {
2327 [UNIT_REQUIRES
] = "Requires",
2328 [UNIT_REQUIRES_OVERRIDABLE
] = "RequiresOverridable",
2329 [UNIT_WANTS
] = "Wants",
2330 [UNIT_REQUISITE
] = "Requisite",
2331 [UNIT_REQUISITE_OVERRIDABLE
] = "RequisiteOverridable",
2332 [UNIT_REQUIRED_BY
] = "RequiredBy",
2333 [UNIT_REQUIRED_BY_OVERRIDABLE
] = "RequiredByOverridable",
2334 [UNIT_BIND_TO
] = "BindTo",
2335 [UNIT_WANTED_BY
] = "WantedBy",
2336 [UNIT_CONFLICTS
] = "Conflicts",
2337 [UNIT_CONFLICTED_BY
] = "ConflictedBy",
2338 [UNIT_BOUND_BY
] = "BoundBy",
2339 [UNIT_BEFORE
] = "Before",
2340 [UNIT_AFTER
] = "After",
2341 [UNIT_REFERENCES
] = "References",
2342 [UNIT_REFERENCED_BY
] = "ReferencedBy",
2343 [UNIT_ON_FAILURE
] = "OnFailure"
2346 DEFINE_STRING_TABLE_LOOKUP(unit_dependency
, UnitDependency
);