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
) {
65 if (!(u
= new0(Unit
, 1)))
68 if (!(u
->meta
.names
= set_new(string_hash_func
, string_compare_func
))) {
74 u
->meta
.type
= _UNIT_TYPE_INVALID
;
75 u
->meta
.deserialized_job
= _JOB_TYPE_INVALID
;
76 u
->meta
.default_dependencies
= true;
77 u
->meta
.unit_file_state
= _UNIT_FILE_STATE_INVALID
;
82 bool unit_has_name(Unit
*u
, const char *name
) {
86 return !!set_get(u
->meta
.names
, (char*) name
);
89 int unit_add_name(Unit
*u
, const char *text
) {
97 if (unit_name_is_template(text
)) {
98 if (!u
->meta
.instance
)
101 s
= unit_name_replace_instance(text
, u
->meta
.instance
);
108 if (!unit_name_is_valid(s
, false)) {
113 assert_se((t
= unit_name_to_type(s
)) >= 0);
115 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
&& t
!= u
->meta
.type
) {
120 if ((r
= unit_name_to_instance(s
, &i
)) < 0)
123 if (i
&& unit_vtable
[t
]->no_instances
) {
128 /* Ensure that this unit is either instanced or not instanced,
130 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
&& !u
->meta
.instance
!= !i
) {
135 if (unit_vtable
[t
]->no_alias
&&
136 !set_isempty(u
->meta
.names
) &&
137 !set_get(u
->meta
.names
, s
)) {
142 if (hashmap_size(u
->meta
.manager
->units
) >= MANAGER_MAX_NAMES
) {
147 if ((r
= set_put(u
->meta
.names
, s
)) < 0) {
153 if ((r
= hashmap_put(u
->meta
.manager
->units
, s
, u
)) < 0) {
154 set_remove(u
->meta
.names
, s
);
158 if (u
->meta
.type
== _UNIT_TYPE_INVALID
) {
162 u
->meta
.instance
= i
;
164 LIST_PREPEND(Meta
, units_by_type
, u
->meta
.manager
->units_by_type
[t
], &u
->meta
);
166 if (UNIT_VTABLE(u
)->init
)
167 UNIT_VTABLE(u
)->init(u
);
171 unit_add_to_dbus_queue(u
);
181 int unit_choose_id(Unit
*u
, const char *name
) {
182 char *s
, *t
= NULL
, *i
;
188 if (unit_name_is_template(name
)) {
190 if (!u
->meta
.instance
)
193 if (!(t
= unit_name_replace_instance(name
, u
->meta
.instance
)))
199 /* Selects one of the names of this unit as the id */
200 s
= set_get(u
->meta
.names
, (char*) name
);
206 if ((r
= unit_name_to_instance(s
, &i
)) < 0)
211 free(u
->meta
.instance
);
212 u
->meta
.instance
= i
;
214 unit_add_to_dbus_queue(u
);
219 int unit_set_description(Unit
*u
, const char *description
) {
224 if (!(s
= strdup(description
)))
227 free(u
->meta
.description
);
228 u
->meta
.description
= s
;
230 unit_add_to_dbus_queue(u
);
234 bool unit_check_gc(Unit
*u
) {
237 if (u
->meta
.load_state
== UNIT_STUB
)
240 if (UNIT_VTABLE(u
)->no_gc
)
249 if (unit_active_state(u
) != UNIT_INACTIVE
)
252 if (UNIT_VTABLE(u
)->check_gc
)
253 if (UNIT_VTABLE(u
)->check_gc(u
))
259 void unit_add_to_load_queue(Unit
*u
) {
261 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
263 if (u
->meta
.load_state
!= UNIT_STUB
|| u
->meta
.in_load_queue
)
266 LIST_PREPEND(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
267 u
->meta
.in_load_queue
= true;
270 void unit_add_to_cleanup_queue(Unit
*u
) {
273 if (u
->meta
.in_cleanup_queue
)
276 LIST_PREPEND(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
277 u
->meta
.in_cleanup_queue
= true;
280 void unit_add_to_gc_queue(Unit
*u
) {
283 if (u
->meta
.in_gc_queue
|| u
->meta
.in_cleanup_queue
)
286 if (unit_check_gc(u
))
289 LIST_PREPEND(Meta
, gc_queue
, u
->meta
.manager
->gc_queue
, &u
->meta
);
290 u
->meta
.in_gc_queue
= true;
292 u
->meta
.manager
->n_in_gc_queue
++;
294 if (u
->meta
.manager
->gc_queue_timestamp
<= 0)
295 u
->meta
.manager
->gc_queue_timestamp
= now(CLOCK_MONOTONIC
);
298 void unit_add_to_dbus_queue(Unit
*u
) {
300 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
302 if (u
->meta
.load_state
== UNIT_STUB
|| u
->meta
.in_dbus_queue
)
305 /* Shortcut things if nobody cares */
306 if (!bus_has_subscriber(u
->meta
.manager
)) {
307 u
->meta
.sent_dbus_new_signal
= true;
311 LIST_PREPEND(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
312 u
->meta
.in_dbus_queue
= true;
315 static void bidi_set_free(Unit
*u
, Set
*s
) {
321 /* Frees the set and makes sure we are dropped from the
322 * inverse pointers */
324 SET_FOREACH(other
, s
, i
) {
327 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
328 set_remove(other
->meta
.dependencies
[d
], u
);
330 unit_add_to_gc_queue(other
);
336 void unit_free(Unit
*u
) {
343 bus_unit_send_removed_signal(u
);
345 if (u
->meta
.load_state
!= UNIT_STUB
)
346 if (UNIT_VTABLE(u
)->done
)
347 UNIT_VTABLE(u
)->done(u
);
349 SET_FOREACH(t
, u
->meta
.names
, i
)
350 hashmap_remove_value(u
->meta
.manager
->units
, t
, u
);
353 job_free(u
->meta
.job
);
355 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
356 bidi_set_free(u
, u
->meta
.dependencies
[d
]);
358 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
)
359 LIST_REMOVE(Meta
, units_by_type
, u
->meta
.manager
->units_by_type
[u
->meta
.type
], &u
->meta
);
361 if (u
->meta
.in_load_queue
)
362 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
364 if (u
->meta
.in_dbus_queue
)
365 LIST_REMOVE(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
367 if (u
->meta
.in_cleanup_queue
)
368 LIST_REMOVE(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
370 if (u
->meta
.in_gc_queue
) {
371 LIST_REMOVE(Meta
, gc_queue
, u
->meta
.manager
->gc_queue
, &u
->meta
);
372 u
->meta
.manager
->n_in_gc_queue
--;
375 cgroup_bonding_free_list(u
->meta
.cgroup_bondings
, u
->meta
.manager
->n_reloading
<= 0);
376 cgroup_attribute_free_list(u
->meta
.cgroup_attributes
);
378 free(u
->meta
.description
);
379 free(u
->meta
.fragment_path
);
381 set_free_free(u
->meta
.names
);
383 condition_free_list(u
->meta
.conditions
);
385 free(u
->meta
.instance
);
389 UnitActiveState
unit_active_state(Unit
*u
) {
392 if (u
->meta
.load_state
== UNIT_MERGED
)
393 return unit_active_state(unit_follow_merge(u
));
395 /* After a reload it might happen that a unit is not correctly
396 * loaded but still has a process around. That's why we won't
397 * shortcut failed loading to UNIT_INACTIVE_FAILED. */
399 return UNIT_VTABLE(u
)->active_state(u
);
402 const char* unit_sub_state_to_string(Unit
*u
) {
405 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
408 static void complete_move(Set
**s
, Set
**other
) {
416 set_move(*s
, *other
);
423 static void merge_names(Unit
*u
, Unit
*other
) {
430 complete_move(&u
->meta
.names
, &other
->meta
.names
);
432 set_free_free(other
->meta
.names
);
433 other
->meta
.names
= NULL
;
434 other
->meta
.id
= NULL
;
436 SET_FOREACH(t
, u
->meta
.names
, i
)
437 assert_se(hashmap_replace(u
->meta
.manager
->units
, t
, u
) == 0);
440 static void merge_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
447 assert(d
< _UNIT_DEPENDENCY_MAX
);
449 /* Fix backwards pointers */
450 SET_FOREACH(back
, other
->meta
.dependencies
[d
], i
) {
453 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++)
454 if ((r
= set_remove_and_put(back
->meta
.dependencies
[k
], other
, u
)) < 0) {
457 set_remove(back
->meta
.dependencies
[k
], other
);
459 assert(r
== -ENOENT
);
463 complete_move(&u
->meta
.dependencies
[d
], &other
->meta
.dependencies
[d
]);
465 set_free(other
->meta
.dependencies
[d
]);
466 other
->meta
.dependencies
[d
] = NULL
;
469 int unit_merge(Unit
*u
, Unit
*other
) {
474 assert(u
->meta
.manager
== other
->meta
.manager
);
475 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
477 other
= unit_follow_merge(other
);
482 if (u
->meta
.type
!= other
->meta
.type
)
485 if (!u
->meta
.instance
!= !other
->meta
.instance
)
488 if (other
->meta
.load_state
!= UNIT_STUB
&&
489 other
->meta
.load_state
!= UNIT_ERROR
)
495 if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other
)))
499 merge_names(u
, other
);
501 /* Merge dependencies */
502 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
503 merge_dependencies(u
, other
, d
);
505 other
->meta
.load_state
= UNIT_MERGED
;
506 other
->meta
.merged_into
= u
;
508 /* If there is still some data attached to the other node, we
509 * don't need it anymore, and can free it. */
510 if (other
->meta
.load_state
!= UNIT_STUB
)
511 if (UNIT_VTABLE(other
)->done
)
512 UNIT_VTABLE(other
)->done(other
);
514 unit_add_to_dbus_queue(u
);
515 unit_add_to_cleanup_queue(other
);
520 int unit_merge_by_name(Unit
*u
, const char *name
) {
528 if (unit_name_is_template(name
)) {
529 if (!u
->meta
.instance
)
532 if (!(s
= unit_name_replace_instance(name
, u
->meta
.instance
)))
538 if (!(other
= manager_get_unit(u
->meta
.manager
, name
)))
539 r
= unit_add_name(u
, name
);
541 r
= unit_merge(u
, other
);
547 Unit
* unit_follow_merge(Unit
*u
) {
550 while (u
->meta
.load_state
== UNIT_MERGED
)
551 assert_se(u
= u
->meta
.merged_into
);
556 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
562 if (c
->std_output
!= EXEC_OUTPUT_KMSG
&&
563 c
->std_output
!= EXEC_OUTPUT_SYSLOG
&&
564 c
->std_output
!= EXEC_OUTPUT_KMSG_AND_CONSOLE
&&
565 c
->std_output
!= EXEC_OUTPUT_SYSLOG_AND_CONSOLE
&&
566 c
->std_error
!= EXEC_OUTPUT_KMSG
&&
567 c
->std_error
!= EXEC_OUTPUT_SYSLOG_AND_CONSOLE
&&
568 c
->std_error
!= EXEC_OUTPUT_KMSG
&&
569 c
->std_error
!= EXEC_OUTPUT_SYSLOG_AND_CONSOLE
)
572 /* If syslog or kernel logging is requested, make sure our own
573 * logging daemon is run first. */
575 if (u
->meta
.manager
->running_as
== MANAGER_SYSTEM
)
576 if ((r
= unit_add_two_dependencies_by_name(u
, UNIT_REQUIRES
, UNIT_AFTER
, SPECIAL_STDOUT_SYSLOG_BRIDGE_SOCKET
, NULL
, true)) < 0)
582 const char *unit_description(Unit
*u
) {
585 if (u
->meta
.description
)
586 return u
->meta
.description
;
588 return strna(u
->meta
.id
);
591 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
598 timestamp1
[FORMAT_TIMESTAMP_MAX
],
599 timestamp2
[FORMAT_TIMESTAMP_MAX
],
600 timestamp3
[FORMAT_TIMESTAMP_MAX
],
601 timestamp4
[FORMAT_TIMESTAMP_MAX
],
602 timespan
[FORMAT_TIMESPAN_MAX
];
606 assert(u
->meta
.type
>= 0);
610 p2
= strappend(prefix
, "\t");
611 prefix2
= p2
? p2
: prefix
;
615 "%s\tDescription: %s\n"
617 "%s\tUnit Load State: %s\n"
618 "%s\tUnit Active State: %s\n"
619 "%s\tInactive Exit Timestamp: %s\n"
620 "%s\tActive Enter Timestamp: %s\n"
621 "%s\tActive Exit Timestamp: %s\n"
622 "%s\tInactive Enter Timestamp: %s\n"
623 "%s\tGC Check Good: %s\n"
624 "%s\tNeed Daemon Reload: %s\n",
626 prefix
, unit_description(u
),
627 prefix
, strna(u
->meta
.instance
),
628 prefix
, unit_load_state_to_string(u
->meta
.load_state
),
629 prefix
, unit_active_state_to_string(unit_active_state(u
)),
630 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->meta
.inactive_exit_timestamp
.realtime
)),
631 prefix
, strna(format_timestamp(timestamp2
, sizeof(timestamp2
), u
->meta
.active_enter_timestamp
.realtime
)),
632 prefix
, strna(format_timestamp(timestamp3
, sizeof(timestamp3
), u
->meta
.active_exit_timestamp
.realtime
)),
633 prefix
, strna(format_timestamp(timestamp4
, sizeof(timestamp4
), u
->meta
.inactive_enter_timestamp
.realtime
)),
634 prefix
, yes_no(unit_check_gc(u
)),
635 prefix
, yes_no(unit_need_daemon_reload(u
)));
637 SET_FOREACH(t
, u
->meta
.names
, i
)
638 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
640 if ((following
= unit_following(u
)))
641 fprintf(f
, "%s\tFollowing: %s\n", prefix
, following
->meta
.id
);
643 if (u
->meta
.fragment_path
)
644 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->meta
.fragment_path
);
646 if (u
->meta
.job_timeout
> 0)
647 fprintf(f
, "%s\tJob Timeout: %s\n", prefix
, format_timespan(timespan
, sizeof(timespan
), u
->meta
.job_timeout
));
649 condition_dump_list(u
->meta
.conditions
, f
, prefix
);
651 if (dual_timestamp_is_set(&u
->meta
.condition_timestamp
))
653 "%s\tCondition Timestamp: %s\n"
654 "%s\tCondition Result: %s\n",
655 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->meta
.condition_timestamp
.realtime
)),
656 prefix
, yes_no(u
->meta
.condition_result
));
658 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
661 SET_FOREACH(other
, u
->meta
.dependencies
[d
], i
)
662 fprintf(f
, "%s\t%s: %s\n", prefix
, unit_dependency_to_string(d
), other
->meta
.id
);
665 if (u
->meta
.load_state
== UNIT_LOADED
) {
670 "%s\tStopWhenUnneeded: %s\n"
671 "%s\tRefuseManualStart: %s\n"
672 "%s\tRefuseManualStop: %s\n"
673 "%s\tDefaultDependencies: %s\n"
674 "%s\tOnFailureIsolate: %s\n"
675 "%s\tIgnoreOnIsolate: %s\n"
676 "%s\tIgnoreOnSnapshot: %s\n",
677 prefix
, yes_no(u
->meta
.stop_when_unneeded
),
678 prefix
, yes_no(u
->meta
.refuse_manual_start
),
679 prefix
, yes_no(u
->meta
.refuse_manual_stop
),
680 prefix
, yes_no(u
->meta
.default_dependencies
),
681 prefix
, yes_no(u
->meta
.on_failure_isolate
),
682 prefix
, yes_no(u
->meta
.ignore_on_isolate
),
683 prefix
, yes_no(u
->meta
.ignore_on_snapshot
));
685 LIST_FOREACH(by_unit
, b
, u
->meta
.cgroup_bondings
)
686 fprintf(f
, "%s\tControlGroup: %s:%s\n",
687 prefix
, b
->controller
, b
->path
);
689 LIST_FOREACH(by_unit
, a
, u
->meta
.cgroup_attributes
) {
693 a
->map_callback(a
->controller
, a
->name
, a
->value
, &v
);
695 fprintf(f
, "%s\tControlGroupAttribute: %s %s \"%s\"\n",
696 prefix
, a
->controller
, a
->name
, v
? v
: a
->value
);
701 if (UNIT_VTABLE(u
)->dump
)
702 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
704 } else if (u
->meta
.load_state
== UNIT_MERGED
)
706 "%s\tMerged into: %s\n",
707 prefix
, u
->meta
.merged_into
->meta
.id
);
708 else if (u
->meta
.load_state
== UNIT_ERROR
)
709 fprintf(f
, "%s\tLoad Error Code: %s\n", prefix
, strerror(-u
->meta
.load_error
));
713 job_dump(u
->meta
.job
, f
, prefix2
);
718 /* Common implementation for multiple backends */
719 int unit_load_fragment_and_dropin(Unit
*u
) {
724 /* Load a .service file */
725 if ((r
= unit_load_fragment(u
)) < 0)
728 if (u
->meta
.load_state
== UNIT_STUB
)
731 /* Load drop-in directory data */
732 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
738 /* Common implementation for multiple backends */
739 int unit_load_fragment_and_dropin_optional(Unit
*u
) {
744 /* Same as unit_load_fragment_and_dropin(), but whether
745 * something can be loaded or not doesn't matter. */
747 /* Load a .service file */
748 if ((r
= unit_load_fragment(u
)) < 0)
751 if (u
->meta
.load_state
== UNIT_STUB
)
752 u
->meta
.load_state
= UNIT_LOADED
;
754 /* Load drop-in directory data */
755 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
761 int unit_add_default_target_dependency(Unit
*u
, Unit
*target
) {
765 if (target
->meta
.type
!= UNIT_TARGET
)
768 /* Only add the dependency if both units are loaded, so that
769 * that loop check below is reliable */
770 if (u
->meta
.load_state
!= UNIT_LOADED
||
771 target
->meta
.load_state
!= UNIT_LOADED
)
774 /* If either side wants no automatic dependencies, then let's
776 if (!u
->meta
.default_dependencies
||
777 target
->meta
.default_dependencies
)
780 /* Don't create loops */
781 if (set_get(target
->meta
.dependencies
[UNIT_BEFORE
], u
))
784 return unit_add_dependency(target
, UNIT_AFTER
, u
, true);
787 static int unit_add_default_dependencies(Unit
*u
) {
788 static const UnitDependency deps
[] = {
790 UNIT_REQUIRED_BY_OVERRIDABLE
,
802 for (k
= 0; k
< ELEMENTSOF(deps
); k
++)
803 SET_FOREACH(target
, u
->meta
.dependencies
[deps
[k
]], i
)
804 if ((r
= unit_add_default_target_dependency(u
, target
)) < 0)
810 int unit_load(Unit
*u
) {
815 if (u
->meta
.in_load_queue
) {
816 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
817 u
->meta
.in_load_queue
= false;
820 if (u
->meta
.type
== _UNIT_TYPE_INVALID
)
823 if (u
->meta
.load_state
!= UNIT_STUB
)
826 if (UNIT_VTABLE(u
)->load
)
827 if ((r
= UNIT_VTABLE(u
)->load(u
)) < 0)
830 if (u
->meta
.load_state
== UNIT_STUB
) {
835 if (u
->meta
.load_state
== UNIT_LOADED
&&
836 u
->meta
.default_dependencies
)
837 if ((r
= unit_add_default_dependencies(u
)) < 0)
840 if (u
->meta
.on_failure_isolate
&&
841 set_size(u
->meta
.dependencies
[UNIT_ON_FAILURE
]) > 1) {
843 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
850 assert((u
->meta
.load_state
!= UNIT_MERGED
) == !u
->meta
.merged_into
);
852 unit_add_to_dbus_queue(unit_follow_merge(u
));
853 unit_add_to_gc_queue(u
);
858 u
->meta
.load_state
= UNIT_ERROR
;
859 u
->meta
.load_error
= r
;
860 unit_add_to_dbus_queue(u
);
862 log_debug("Failed to load configuration for %s: %s", u
->meta
.id
, strerror(-r
));
867 bool unit_condition_test(Unit
*u
) {
870 dual_timestamp_get(&u
->meta
.condition_timestamp
);
871 u
->meta
.condition_result
= condition_test_list(u
->meta
.conditions
);
873 return u
->meta
.condition_result
;
877 * -EBADR: This unit type does not support starting.
878 * -EALREADY: Unit is already started.
879 * -EAGAIN: An operation is already in progress. Retry later.
880 * -ECANCELED: Too many requests for now.
882 int unit_start(Unit
*u
) {
883 UnitActiveState state
;
888 if (u
->meta
.load_state
!= UNIT_LOADED
)
891 /* If this is already (being) started, then this will
892 * succeed. Note that this will even succeed if this unit is
893 * not startable by the user. This is relied on to detect when
894 * we need to wait for units and when waiting is finished. */
895 state
= unit_active_state(u
);
896 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
899 /* If the conditions failed, don't do anything at all */
900 if (!unit_condition_test(u
)) {
901 log_debug("Starting of %s requested but condition failed. Ignoring.", u
->meta
.id
);
905 /* Forward to the main object, if we aren't it. */
906 if ((following
= unit_following(u
))) {
907 log_debug("Redirecting start request from %s to %s.", u
->meta
.id
, following
->meta
.id
);
908 return unit_start(following
);
911 /* If it is stopped, but we cannot start it, then fail */
912 if (!UNIT_VTABLE(u
)->start
)
915 /* We don't suppress calls to ->start() here when we are
916 * already starting, to allow this request to be used as a
917 * "hurry up" call, for example when the unit is in some "auto
918 * restart" state where it waits for a holdoff timer to elapse
919 * before it will start again. */
921 unit_add_to_dbus_queue(u
);
923 unit_status_printf(u
, "Starting %s...\n", unit_description(u
));
924 return UNIT_VTABLE(u
)->start(u
);
927 bool unit_can_start(Unit
*u
) {
930 return !!UNIT_VTABLE(u
)->start
;
933 bool unit_can_isolate(Unit
*u
) {
936 return unit_can_start(u
) &&
937 u
->meta
.allow_isolate
;
941 * -EBADR: This unit type does not support stopping.
942 * -EALREADY: Unit is already stopped.
943 * -EAGAIN: An operation is already in progress. Retry later.
945 int unit_stop(Unit
*u
) {
946 UnitActiveState state
;
951 state
= unit_active_state(u
);
952 if (UNIT_IS_INACTIVE_OR_FAILED(state
))
955 if ((following
= unit_following(u
))) {
956 log_debug("Redirecting stop request from %s to %s.", u
->meta
.id
, following
->meta
.id
);
957 return unit_stop(following
);
960 if (!UNIT_VTABLE(u
)->stop
)
963 unit_add_to_dbus_queue(u
);
965 unit_status_printf(u
, "Stopping %s...\n", unit_description(u
));
966 return UNIT_VTABLE(u
)->stop(u
);
970 * -EBADR: This unit type does not support reloading.
971 * -ENOEXEC: Unit is not started.
972 * -EAGAIN: An operation is already in progress. Retry later.
974 int unit_reload(Unit
*u
) {
975 UnitActiveState state
;
980 if (u
->meta
.load_state
!= UNIT_LOADED
)
983 if (!unit_can_reload(u
))
986 state
= unit_active_state(u
);
987 if (state
== UNIT_RELOADING
)
990 if (state
!= UNIT_ACTIVE
)
993 if ((following
= unit_following(u
))) {
994 log_debug("Redirecting reload request from %s to %s.", u
->meta
.id
, following
->meta
.id
);
995 return unit_reload(following
);
998 unit_add_to_dbus_queue(u
);
999 return UNIT_VTABLE(u
)->reload(u
);
1002 bool unit_can_reload(Unit
*u
) {
1005 if (!UNIT_VTABLE(u
)->reload
)
1008 if (!UNIT_VTABLE(u
)->can_reload
)
1011 return UNIT_VTABLE(u
)->can_reload(u
);
1014 static void unit_check_unneeded(Unit
*u
) {
1020 /* If this service shall be shut down when unneeded then do
1023 if (!u
->meta
.stop_when_unneeded
)
1026 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
1029 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
1030 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1033 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY_OVERRIDABLE
], i
)
1034 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1037 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTED_BY
], i
)
1038 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1041 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_BOUND_BY
], i
)
1042 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1045 log_info("Service %s is not needed anymore. Stopping.", u
->meta
.id
);
1047 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1048 manager_add_job(u
->meta
.manager
, JOB_STOP
, u
, JOB_FAIL
, true, NULL
, NULL
);
1051 static void retroactively_start_dependencies(Unit
*u
) {
1056 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
1058 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
1059 if (!set_get(u
->meta
.dependencies
[UNIT_AFTER
], other
) &&
1060 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1061 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1063 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_BIND_TO
], i
)
1064 if (!set_get(u
->meta
.dependencies
[UNIT_AFTER
], other
) &&
1065 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1066 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1068 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
1069 if (!set_get(u
->meta
.dependencies
[UNIT_AFTER
], other
) &&
1070 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1071 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
, NULL
);
1073 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
1074 if (!set_get(u
->meta
.dependencies
[UNIT_AFTER
], other
) &&
1075 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1076 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1078 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
1079 if (!set_get(u
->meta
.dependencies
[UNIT_AFTER
], other
) &&
1080 !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
1081 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
, NULL
);
1083 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
1084 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1085 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1087 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_CONFLICTED_BY
], i
)
1088 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1089 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1092 static void retroactively_stop_dependencies(Unit
*u
) {
1097 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
1099 /* Pull down units which are bound to us recursively if enabled */
1100 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_BOUND_BY
], i
)
1101 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1102 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
, NULL
);
1104 /* Garbage collect services that might not be needed anymore, if enabled */
1105 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
1106 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1107 unit_check_unneeded(other
);
1108 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
1109 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1110 unit_check_unneeded(other
);
1111 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
1112 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1113 unit_check_unneeded(other
);
1114 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
1115 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1116 unit_check_unneeded(other
);
1117 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE_OVERRIDABLE
], i
)
1118 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1119 unit_check_unneeded(other
);
1120 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_BIND_TO
], i
)
1121 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
1122 unit_check_unneeded(other
);
1125 void unit_trigger_on_failure(Unit
*u
) {
1131 if (set_size(u
->meta
.dependencies
[UNIT_ON_FAILURE
]) <= 0)
1134 log_info("Triggering OnFailure= dependencies of %s.", u
->meta
.id
);
1136 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_ON_FAILURE
], i
) {
1139 if ((r
= manager_add_job(u
->meta
.manager
, JOB_START
, other
, u
->meta
.on_failure_isolate
? JOB_ISOLATE
: JOB_REPLACE
, true, NULL
, NULL
)) < 0)
1140 log_error("Failed to enqueue OnFailure= job: %s", strerror(-r
));
1144 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
, bool reload_success
) {
1148 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
1149 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
1151 /* Note that this is called for all low-level state changes,
1152 * even if they might map to the same high-level
1153 * UnitActiveState! That means that ns == os is OK an expected
1154 * behaviour here. For example: if a mount point is remounted
1155 * this function will be called too! */
1157 if (u
->meta
.manager
->n_reloading
<= 0) {
1160 dual_timestamp_get(&ts
);
1162 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && !UNIT_IS_INACTIVE_OR_FAILED(ns
))
1163 u
->meta
.inactive_exit_timestamp
= ts
;
1164 else if (!UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_INACTIVE_OR_FAILED(ns
))
1165 u
->meta
.inactive_enter_timestamp
= ts
;
1167 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1168 u
->meta
.active_enter_timestamp
= ts
;
1169 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1170 u
->meta
.active_exit_timestamp
= ts
;
1172 timer_unit_notify(u
, ns
);
1173 path_unit_notify(u
, ns
);
1176 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1177 cgroup_bonding_trim_list(u
->meta
.cgroup_bondings
, true);
1182 if (u
->meta
.job
->state
== JOB_WAITING
)
1184 /* So we reached a different state for this
1185 * job. Let's see if we can run it now if it
1186 * failed previously due to EAGAIN. */
1187 job_add_to_run_queue(u
->meta
.job
);
1189 /* Let's check whether this state change constitutes a
1190 * finished job, or maybe contradicts a running job and
1191 * hence needs to invalidate jobs. */
1193 switch (u
->meta
.job
->type
) {
1196 case JOB_VERIFY_ACTIVE
:
1198 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
1199 job_finish_and_invalidate(u
->meta
.job
, JOB_DONE
);
1200 else if (u
->meta
.job
->state
== JOB_RUNNING
&& ns
!= UNIT_ACTIVATING
) {
1203 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1204 job_finish_and_invalidate(u
->meta
.job
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
);
1210 case JOB_RELOAD_OR_START
:
1212 if (u
->meta
.job
->state
== JOB_RUNNING
) {
1213 if (ns
== UNIT_ACTIVE
)
1214 job_finish_and_invalidate(u
->meta
.job
, reload_success
? JOB_DONE
: JOB_FAILED
);
1215 else if (ns
!= UNIT_ACTIVATING
&& ns
!= UNIT_RELOADING
) {
1218 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1219 job_finish_and_invalidate(u
->meta
.job
, ns
== UNIT_FAILED
? JOB_FAILED
: JOB_DONE
);
1227 case JOB_TRY_RESTART
:
1229 if (UNIT_IS_INACTIVE_OR_FAILED(ns
))
1230 job_finish_and_invalidate(u
->meta
.job
, JOB_DONE
);
1231 else if (u
->meta
.job
->state
== JOB_RUNNING
&& ns
!= UNIT_DEACTIVATING
) {
1233 job_finish_and_invalidate(u
->meta
.job
, JOB_FAILED
);
1239 assert_not_reached("Job type unknown");
1245 if (u
->meta
.manager
->n_reloading
<= 0) {
1247 /* If this state change happened without being
1248 * requested by a job, then let's retroactively start
1249 * or stop dependencies. We skip that step when
1250 * deserializing, since we don't want to create any
1251 * additional jobs just because something is already
1255 if (UNIT_IS_INACTIVE_OR_FAILED(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
1256 retroactively_start_dependencies(u
);
1257 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
1258 retroactively_stop_dependencies(u
);
1261 if (ns
!= os
&& ns
== UNIT_FAILED
) {
1262 log_notice("Unit %s entered failed state.", u
->meta
.id
);
1263 unit_trigger_on_failure(u
);
1267 /* Some names are special */
1268 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
1270 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
))
1271 /* The bus just might have become available,
1272 * hence try to connect to it, if we aren't
1274 bus_init(u
->meta
.manager
, true);
1276 if (u
->meta
.type
== UNIT_SERVICE
&&
1277 !UNIT_IS_ACTIVE_OR_RELOADING(os
) &&
1278 u
->meta
.manager
->n_reloading
<= 0) {
1279 /* Write audit record if we have just finished starting up */
1280 manager_send_unit_audit(u
->meta
.manager
, u
, AUDIT_SERVICE_START
, true);
1281 u
->meta
.in_audit
= true;
1284 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
))
1285 manager_send_unit_plymouth(u
->meta
.manager
, u
);
1289 /* We don't care about D-Bus here, since we'll get an
1290 * asynchronous notification for it anyway. */
1292 if (u
->meta
.type
== UNIT_SERVICE
&&
1293 UNIT_IS_INACTIVE_OR_FAILED(ns
) &&
1294 !UNIT_IS_INACTIVE_OR_FAILED(os
) &&
1295 u
->meta
.manager
->n_reloading
<= 0) {
1297 /* Hmm, if there was no start record written
1298 * write it now, so that we always have a nice
1300 if (!u
->meta
.in_audit
) {
1301 manager_send_unit_audit(u
->meta
.manager
, u
, AUDIT_SERVICE_START
, ns
== UNIT_INACTIVE
);
1303 if (ns
== UNIT_INACTIVE
)
1304 manager_send_unit_audit(u
->meta
.manager
, u
, AUDIT_SERVICE_STOP
, true);
1306 /* Write audit record if we have just finished shutting down */
1307 manager_send_unit_audit(u
->meta
.manager
, u
, AUDIT_SERVICE_STOP
, ns
== UNIT_INACTIVE
);
1309 u
->meta
.in_audit
= false;
1313 manager_recheck_syslog(u
->meta
.manager
);
1315 /* Maybe we finished startup and are now ready for being
1316 * stopped because unneeded? */
1317 unit_check_unneeded(u
);
1319 unit_add_to_dbus_queue(u
);
1320 unit_add_to_gc_queue(u
);
1323 int unit_watch_fd(Unit
*u
, int fd
, uint32_t events
, Watch
*w
) {
1324 struct epoll_event ev
;
1329 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_FD
&& w
->fd
== fd
&& w
->data
.unit
== u
));
1335 if (epoll_ctl(u
->meta
.manager
->epoll_fd
,
1336 w
->type
== WATCH_INVALID
? EPOLL_CTL_ADD
: EPOLL_CTL_MOD
,
1348 void unit_unwatch_fd(Unit
*u
, Watch
*w
) {
1352 if (w
->type
== WATCH_INVALID
)
1355 assert(w
->type
== WATCH_FD
);
1356 assert(w
->data
.unit
== u
);
1357 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1360 w
->type
= WATCH_INVALID
;
1361 w
->data
.unit
= NULL
;
1364 int unit_watch_pid(Unit
*u
, pid_t pid
) {
1368 /* Watch a specific PID. We only support one unit watching
1369 * each PID for now. */
1371 return hashmap_put(u
->meta
.manager
->watch_pids
, LONG_TO_PTR(pid
), u
);
1374 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
1378 hashmap_remove_value(u
->meta
.manager
->watch_pids
, LONG_TO_PTR(pid
), u
);
1381 int unit_watch_timer(Unit
*u
, usec_t delay
, Watch
*w
) {
1382 struct itimerspec its
;
1388 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_UNIT_TIMER
&& w
->data
.unit
== u
));
1390 /* This will try to reuse the old timer if there is one */
1392 if (w
->type
== WATCH_UNIT_TIMER
) {
1393 assert(w
->data
.unit
== u
);
1398 } else if (w
->type
== WATCH_INVALID
) {
1401 if ((fd
= timerfd_create(CLOCK_MONOTONIC
, TFD_NONBLOCK
|TFD_CLOEXEC
)) < 0)
1404 assert_not_reached("Invalid watch type");
1409 /* Set absolute time in the past, but not 0, since we
1410 * don't want to disarm the timer */
1411 its
.it_value
.tv_sec
= 0;
1412 its
.it_value
.tv_nsec
= 1;
1414 flags
= TFD_TIMER_ABSTIME
;
1416 timespec_store(&its
.it_value
, delay
);
1420 /* This will also flush the elapse counter */
1421 if (timerfd_settime(fd
, flags
, &its
, NULL
) < 0)
1424 if (w
->type
== WATCH_INVALID
) {
1425 struct epoll_event ev
;
1429 ev
.events
= EPOLLIN
;
1431 if (epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_ADD
, fd
, &ev
) < 0)
1435 w
->type
= WATCH_UNIT_TIMER
;
1443 close_nointr_nofail(fd
);
1448 void unit_unwatch_timer(Unit
*u
, Watch
*w
) {
1452 if (w
->type
== WATCH_INVALID
)
1455 assert(w
->type
== WATCH_UNIT_TIMER
);
1456 assert(w
->data
.unit
== u
);
1459 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1460 close_nointr_nofail(w
->fd
);
1463 w
->type
= WATCH_INVALID
;
1464 w
->data
.unit
= NULL
;
1467 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
1469 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
1473 case JOB_VERIFY_ACTIVE
:
1479 case JOB_TRY_RESTART
:
1480 return unit_can_start(u
);
1483 return unit_can_reload(u
);
1485 case JOB_RELOAD_OR_START
:
1486 return unit_can_reload(u
) && unit_can_start(u
);
1489 assert_not_reached("Invalid job type");
1493 int unit_add_dependency(Unit
*u
, UnitDependency d
, Unit
*other
, bool add_reference
) {
1495 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
1496 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
1497 [UNIT_REQUIRES_OVERRIDABLE
] = UNIT_REQUIRED_BY_OVERRIDABLE
,
1498 [UNIT_WANTS
] = UNIT_WANTED_BY
,
1499 [UNIT_REQUISITE
] = UNIT_REQUIRED_BY
,
1500 [UNIT_REQUISITE_OVERRIDABLE
] = UNIT_REQUIRED_BY_OVERRIDABLE
,
1501 [UNIT_BIND_TO
] = UNIT_BOUND_BY
,
1502 [UNIT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1503 [UNIT_REQUIRED_BY_OVERRIDABLE
] = _UNIT_DEPENDENCY_INVALID
,
1504 [UNIT_WANTED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1505 [UNIT_BOUND_BY
] = UNIT_BIND_TO
,
1506 [UNIT_CONFLICTS
] = UNIT_CONFLICTED_BY
,
1507 [UNIT_CONFLICTED_BY
] = UNIT_CONFLICTS
,
1508 [UNIT_BEFORE
] = UNIT_AFTER
,
1509 [UNIT_AFTER
] = UNIT_BEFORE
,
1510 [UNIT_ON_FAILURE
] = _UNIT_DEPENDENCY_INVALID
,
1511 [UNIT_REFERENCES
] = UNIT_REFERENCED_BY
,
1512 [UNIT_REFERENCED_BY
] = UNIT_REFERENCES
1514 int r
, q
= 0, v
= 0, w
= 0;
1517 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
1520 u
= unit_follow_merge(u
);
1521 other
= unit_follow_merge(other
);
1523 /* We won't allow dependencies on ourselves. We will not
1524 * consider them an error however. */
1528 if ((r
= set_ensure_allocated(&u
->meta
.dependencies
[d
], trivial_hash_func
, trivial_compare_func
)) < 0)
1531 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
)
1532 if ((r
= set_ensure_allocated(&other
->meta
.dependencies
[inverse_table
[d
]], trivial_hash_func
, trivial_compare_func
)) < 0)
1536 if ((r
= set_ensure_allocated(&u
->meta
.dependencies
[UNIT_REFERENCES
], trivial_hash_func
, trivial_compare_func
)) < 0 ||
1537 (r
= set_ensure_allocated(&other
->meta
.dependencies
[UNIT_REFERENCED_BY
], trivial_hash_func
, trivial_compare_func
)) < 0)
1540 if ((q
= set_put(u
->meta
.dependencies
[d
], other
)) < 0)
1543 if (inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
)
1544 if ((v
= set_put(other
->meta
.dependencies
[inverse_table
[d
]], u
)) < 0) {
1549 if (add_reference
) {
1550 if ((w
= set_put(u
->meta
.dependencies
[UNIT_REFERENCES
], other
)) < 0) {
1555 if ((r
= set_put(other
->meta
.dependencies
[UNIT_REFERENCED_BY
], u
)) < 0)
1559 unit_add_to_dbus_queue(u
);
1564 set_remove(u
->meta
.dependencies
[d
], other
);
1567 set_remove(other
->meta
.dependencies
[inverse_table
[d
]], u
);
1570 set_remove(u
->meta
.dependencies
[UNIT_REFERENCES
], other
);
1575 int unit_add_two_dependencies(Unit
*u
, UnitDependency d
, UnitDependency e
, Unit
*other
, bool add_reference
) {
1580 if ((r
= unit_add_dependency(u
, d
, other
, add_reference
)) < 0)
1583 if ((r
= unit_add_dependency(u
, e
, other
, add_reference
)) < 0)
1589 static const char *resolve_template(Unit
*u
, const char *name
, const char*path
, char **p
) {
1593 assert(name
|| path
);
1596 name
= file_name_from_path(path
);
1598 if (!unit_name_is_template(name
)) {
1603 if (u
->meta
.instance
)
1604 s
= unit_name_replace_instance(name
, u
->meta
.instance
);
1608 if (!(i
= unit_name_to_prefix(u
->meta
.id
)))
1611 s
= unit_name_replace_instance(name
, i
);
1622 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, const char *path
, bool add_reference
) {
1628 assert(name
|| path
);
1630 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1633 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, NULL
, &other
)) < 0)
1636 r
= unit_add_dependency(u
, d
, other
, add_reference
);
1643 int unit_add_two_dependencies_by_name(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, const char *path
, bool add_reference
) {
1649 assert(name
|| path
);
1651 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1654 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, NULL
, &other
)) < 0)
1657 r
= unit_add_two_dependencies(u
, d
, e
, other
, add_reference
);
1664 int unit_add_dependency_by_name_inverse(Unit
*u
, UnitDependency d
, const char *name
, const char *path
, bool add_reference
) {
1670 assert(name
|| path
);
1672 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1675 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, NULL
, &other
)) < 0)
1678 r
= unit_add_dependency(other
, d
, u
, add_reference
);
1685 int unit_add_two_dependencies_by_name_inverse(Unit
*u
, UnitDependency d
, UnitDependency e
, const char *name
, const char *path
, bool add_reference
) {
1691 assert(name
|| path
);
1693 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1696 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, NULL
, &other
)) < 0)
1699 if ((r
= unit_add_two_dependencies(other
, d
, e
, u
, add_reference
)) < 0)
1707 int set_unit_path(const char *p
) {
1711 /* This is mostly for debug purposes */
1713 if (path_is_absolute(p
)) {
1714 if (!(c
= strdup(p
)))
1717 if (!(cwd
= get_current_dir_name()))
1720 r
= asprintf(&c
, "%s/%s", cwd
, p
);
1727 if (setenv("SYSTEMD_UNIT_PATH", c
, 0) < 0) {
1736 char *unit_dbus_path(Unit
*u
) {
1744 if (!(e
= bus_path_escape(u
->meta
.id
)))
1747 p
= strappend("/org/freedesktop/systemd1/unit/", e
);
1753 int unit_add_cgroup(Unit
*u
, CGroupBonding
*b
) {
1761 if (!b
->controller
) {
1762 if (!(b
->controller
= strdup(SYSTEMD_CGROUP_CONTROLLER
)))
1768 /* Ensure this hasn't been added yet */
1771 if (streq(b
->controller
, SYSTEMD_CGROUP_CONTROLLER
)) {
1774 l
= hashmap_get(u
->meta
.manager
->cgroup_bondings
, b
->path
);
1775 LIST_PREPEND(CGroupBonding
, by_path
, l
, b
);
1777 if ((r
= hashmap_replace(u
->meta
.manager
->cgroup_bondings
, b
->path
, l
)) < 0) {
1778 LIST_REMOVE(CGroupBonding
, by_path
, l
, b
);
1783 LIST_PREPEND(CGroupBonding
, by_unit
, u
->meta
.cgroup_bondings
, b
);
1789 static char *default_cgroup_path(Unit
*u
) {
1794 if (u
->meta
.instance
) {
1797 t
= unit_name_template(u
->meta
.id
);
1801 p
= join(u
->meta
.manager
->cgroup_hierarchy
, "/", t
, "/", u
->meta
.instance
, NULL
);
1804 p
= join(u
->meta
.manager
->cgroup_hierarchy
, "/", u
->meta
.id
, NULL
);
1809 int unit_add_cgroup_from_text(Unit
*u
, const char *name
) {
1810 char *controller
= NULL
, *path
= NULL
;
1811 CGroupBonding
*b
= NULL
;
1818 if ((r
= cg_split_spec(name
, &controller
, &path
)) < 0)
1822 path
= default_cgroup_path(u
);
1827 controller
= strdup(SYSTEMD_CGROUP_CONTROLLER
);
1831 if (!path
|| !controller
) {
1838 if (cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, controller
)) {
1843 if (!(b
= new0(CGroupBonding
, 1))) {
1848 b
->controller
= controller
;
1851 b
->essential
= streq(controller
, SYSTEMD_CGROUP_CONTROLLER
);
1853 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1866 static int unit_add_one_default_cgroup(Unit
*u
, const char *controller
) {
1867 CGroupBonding
*b
= NULL
;
1873 controller
= SYSTEMD_CGROUP_CONTROLLER
;
1875 if (cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, controller
))
1878 if (!(b
= new0(CGroupBonding
, 1)))
1881 if (!(b
->controller
= strdup(controller
)))
1884 if (!(b
->path
= default_cgroup_path(u
)))
1888 b
->essential
= streq(controller
, SYSTEMD_CGROUP_CONTROLLER
);
1890 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1897 free(b
->controller
);
1903 int unit_add_default_cgroups(Unit
*u
) {
1910 /* Adds in the default cgroups, if they weren't specified
1913 if (!u
->meta
.manager
->cgroup_hierarchy
)
1916 if ((r
= unit_add_one_default_cgroup(u
, NULL
)) < 0)
1919 STRV_FOREACH(c
, u
->meta
.manager
->default_controllers
)
1920 unit_add_one_default_cgroup(u
, *c
);
1922 LIST_FOREACH(by_unit
, a
, u
->meta
.cgroup_attributes
)
1923 unit_add_one_default_cgroup(u
, a
->controller
);
1928 CGroupBonding
* unit_get_default_cgroup(Unit
*u
) {
1931 return cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, SYSTEMD_CGROUP_CONTROLLER
);
1934 int unit_add_cgroup_attribute(Unit
*u
, const char *controller
, const char *name
, const char *value
, CGroupAttributeMapCallback map_callback
) {
1946 dot
= strchr(name
, '.');
1950 c
= strndup(name
, dot
- name
);
1957 if (streq(controller
, SYSTEMD_CGROUP_CONTROLLER
)) {
1962 a
= new0(CGroupAttribute
, 1);
1972 a
->controller
= strdup(controller
);
1974 a
->name
= strdup(name
);
1975 a
->value
= strdup(value
);
1977 if (!a
->controller
|| !a
->name
|| !a
->value
) {
1978 free(a
->controller
);
1986 a
->map_callback
= map_callback
;
1988 LIST_PREPEND(CGroupAttribute
, by_unit
, u
->meta
.cgroup_attributes
, a
);
1997 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
2005 if (!(t
= unit_name_change_suffix(u
->meta
.id
, type
)))
2008 assert(!unit_has_name(u
, t
));
2010 r
= manager_load_unit(u
->meta
.manager
, t
, NULL
, NULL
, _found
);
2013 assert(r
< 0 || *_found
!= u
);
2018 int unit_get_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
2026 if (!(t
= unit_name_change_suffix(u
->meta
.id
, type
)))
2029 assert(!unit_has_name(u
, t
));
2031 found
= manager_get_unit(u
->meta
.manager
, t
);
2041 static char *specifier_prefix_and_instance(char specifier
, void *data
, void *userdata
) {
2045 return unit_name_to_prefix_and_instance(u
->meta
.id
);
2048 static char *specifier_prefix(char specifier
, void *data
, void *userdata
) {
2052 return unit_name_to_prefix(u
->meta
.id
);
2055 static char *specifier_prefix_unescaped(char specifier
, void *data
, void *userdata
) {
2061 if (!(p
= unit_name_to_prefix(u
->meta
.id
)))
2064 r
= unit_name_unescape(p
);
2070 static char *specifier_instance_unescaped(char specifier
, void *data
, void *userdata
) {
2074 if (u
->meta
.instance
)
2075 return unit_name_unescape(u
->meta
.instance
);
2080 static char *specifier_filename(char specifier
, void *data
, void *userdata
) {
2084 if (u
->meta
.instance
)
2085 return unit_name_path_unescape(u
->meta
.instance
);
2087 return unit_name_to_path(u
->meta
.instance
);
2090 static char *specifier_cgroup(char specifier
, void *data
, void *userdata
) {
2094 return default_cgroup_path(u
);
2097 static char *specifier_cgroup_root(char specifier
, void *data
, void *userdata
) {
2102 if (specifier
== 'r')
2103 return strdup(u
->meta
.manager
->cgroup_hierarchy
);
2105 if (parent_of_path(u
->meta
.manager
->cgroup_hierarchy
, &p
) < 0)
2108 if (streq(p
, "/")) {
2116 static char *specifier_runtime(char specifier
, void *data
, void *userdata
) {
2120 if (u
->meta
.manager
->running_as
== MANAGER_USER
) {
2123 e
= getenv("XDG_RUNTIME_DIR");
2128 return strdup("/run");
2131 char *unit_name_printf(Unit
*u
, const char* format
) {
2134 * This will use the passed string as format string and
2135 * replace the following specifiers:
2137 * %n: the full id of the unit (foo@bar.waldo)
2138 * %N: the id of the unit without the suffix (foo@bar)
2139 * %p: the prefix (foo)
2140 * %i: the instance (bar)
2143 const Specifier table
[] = {
2144 { 'n', specifier_string
, u
->meta
.id
},
2145 { 'N', specifier_prefix_and_instance
, NULL
},
2146 { 'p', specifier_prefix
, NULL
},
2147 { 'i', specifier_string
, u
->meta
.instance
},
2154 return specifier_printf(format
, table
, u
);
2157 char *unit_full_printf(Unit
*u
, const char *format
) {
2159 /* This is similar to unit_name_printf() but also supports
2160 * unescaping. Also, adds a couple of additional codes:
2162 * %c cgroup path of unit
2163 * %r root cgroup path of this systemd instance (e.g. "/user/lennart/shared/systemd-4711")
2164 * %R parent of root cgroup path (e.g. "/usr/lennart/shared")
2165 * %t the runtime directory to place sockets in (e.g. "/run" or $XDG_RUNTIME_DIR)
2168 const Specifier table
[] = {
2169 { 'n', specifier_string
, u
->meta
.id
},
2170 { 'N', specifier_prefix_and_instance
, NULL
},
2171 { 'p', specifier_prefix
, NULL
},
2172 { 'P', specifier_prefix_unescaped
, NULL
},
2173 { 'i', specifier_string
, u
->meta
.instance
},
2174 { 'I', specifier_instance_unescaped
, NULL
},
2175 { 'f', specifier_filename
, NULL
},
2176 { 'c', specifier_cgroup
, NULL
},
2177 { 'r', specifier_cgroup_root
, NULL
},
2178 { 'R', specifier_cgroup_root
, NULL
},
2179 { 't', specifier_runtime
, NULL
},
2186 return specifier_printf(format
, table
, u
);
2189 char **unit_full_printf_strv(Unit
*u
, char **l
) {
2193 /* Applies unit_full_printf to every entry in l */
2198 if (!(r
= new(char*, n
+1)))
2201 for (i
= l
, j
= r
; *i
; i
++, j
++)
2202 if (!(*j
= unit_full_printf(u
, *i
)))
2209 for (j
--; j
>= r
; j
--)
2217 int unit_watch_bus_name(Unit
*u
, const char *name
) {
2221 /* Watch a specific name on the bus. We only support one unit
2222 * watching each name for now. */
2224 return hashmap_put(u
->meta
.manager
->watch_bus
, name
, u
);
2227 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
2231 hashmap_remove_value(u
->meta
.manager
->watch_bus
, name
, u
);
2234 bool unit_can_serialize(Unit
*u
) {
2237 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
2240 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
2247 if (!unit_can_serialize(u
))
2250 if ((r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
)) < 0)
2254 unit_serialize_item(u
, f
, "job", job_type_to_string(u
->meta
.job
->type
));
2256 dual_timestamp_serialize(f
, "inactive-exit-timestamp", &u
->meta
.inactive_exit_timestamp
);
2257 dual_timestamp_serialize(f
, "active-enter-timestamp", &u
->meta
.active_enter_timestamp
);
2258 dual_timestamp_serialize(f
, "active-exit-timestamp", &u
->meta
.active_exit_timestamp
);
2259 dual_timestamp_serialize(f
, "inactive-enter-timestamp", &u
->meta
.inactive_enter_timestamp
);
2260 dual_timestamp_serialize(f
, "condition-timestamp", &u
->meta
.condition_timestamp
);
2262 if (dual_timestamp_is_set(&u
->meta
.condition_timestamp
))
2263 unit_serialize_item(u
, f
, "condition-result", yes_no(u
->meta
.condition_result
));
2270 void unit_serialize_item_format(Unit
*u
, FILE *f
, const char *key
, const char *format
, ...) {
2281 va_start(ap
, format
);
2282 vfprintf(f
, format
, ap
);
2288 void unit_serialize_item(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
2294 fprintf(f
, "%s=%s\n", key
, value
);
2297 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
2304 if (!unit_can_serialize(u
))
2308 char line
[LINE_MAX
], *l
, *v
;
2311 if (!fgets(line
, sizeof(line
), f
)) {
2324 k
= strcspn(l
, "=");
2332 if (streq(l
, "job")) {
2335 if ((type
= job_type_from_string(v
)) < 0)
2336 log_debug("Failed to parse job type value %s", v
);
2338 u
->meta
.deserialized_job
= type
;
2341 } else if (streq(l
, "inactive-exit-timestamp")) {
2342 dual_timestamp_deserialize(v
, &u
->meta
.inactive_exit_timestamp
);
2344 } else if (streq(l
, "active-enter-timestamp")) {
2345 dual_timestamp_deserialize(v
, &u
->meta
.active_enter_timestamp
);
2347 } else if (streq(l
, "active-exit-timestamp")) {
2348 dual_timestamp_deserialize(v
, &u
->meta
.active_exit_timestamp
);
2350 } else if (streq(l
, "inactive-enter-timestamp")) {
2351 dual_timestamp_deserialize(v
, &u
->meta
.inactive_enter_timestamp
);
2353 } else if (streq(l
, "condition-timestamp")) {
2354 dual_timestamp_deserialize(v
, &u
->meta
.condition_timestamp
);
2356 } else if (streq(l
, "condition-result")) {
2359 if ((b
= parse_boolean(v
)) < 0)
2360 log_debug("Failed to parse condition result value %s", v
);
2362 u
->meta
.condition_result
= b
;
2367 if ((r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
)) < 0)
2372 int unit_add_node_link(Unit
*u
, const char *what
, bool wants
) {
2382 /* Adds in links to the device node that this unit is based on */
2384 if (!is_device_path(what
))
2387 if (!(e
= unit_name_build_escape(what
+1, NULL
, ".device")))
2390 r
= manager_load_unit(u
->meta
.manager
, e
, NULL
, NULL
, &device
);
2396 if ((r
= unit_add_two_dependencies(u
, UNIT_AFTER
, UNIT_BIND_TO
, device
, true)) < 0)
2400 if ((r
= unit_add_dependency(device
, UNIT_WANTS
, u
, false)) < 0)
2406 int unit_coldplug(Unit
*u
) {
2411 if (UNIT_VTABLE(u
)->coldplug
)
2412 if ((r
= UNIT_VTABLE(u
)->coldplug(u
)) < 0)
2415 if (u
->meta
.deserialized_job
>= 0) {
2416 if ((r
= manager_add_job(u
->meta
.manager
, u
->meta
.deserialized_job
, u
, JOB_IGNORE_REQUIREMENTS
, false, NULL
, NULL
)) < 0)
2419 u
->meta
.deserialized_job
= _JOB_TYPE_INVALID
;
2425 void unit_status_printf(Unit
*u
, const char *format
, ...) {
2431 if (!UNIT_VTABLE(u
)->show_status
)
2434 if (!manager_get_show_status(u
->meta
.manager
))
2437 if (!manager_is_booting_or_shutting_down(u
->meta
.manager
))
2440 va_start(ap
, format
);
2441 status_vprintf(format
, ap
);
2445 bool unit_need_daemon_reload(Unit
*u
) {
2448 if (u
->meta
.fragment_path
) {
2452 if (stat(u
->meta
.fragment_path
, &st
) < 0)
2453 /* What, cannot access this anymore? */
2456 if (u
->meta
.fragment_mtime
> 0 &&
2457 timespec_load(&st
.st_mtim
) != u
->meta
.fragment_mtime
)
2461 if (UNIT_VTABLE(u
)->need_daemon_reload
)
2462 return UNIT_VTABLE(u
)->need_daemon_reload(u
);
2467 void unit_reset_failed(Unit
*u
) {
2470 if (UNIT_VTABLE(u
)->reset_failed
)
2471 UNIT_VTABLE(u
)->reset_failed(u
);
2474 Unit
*unit_following(Unit
*u
) {
2477 if (UNIT_VTABLE(u
)->following
)
2478 return UNIT_VTABLE(u
)->following(u
);
2483 bool unit_pending_inactive(Unit
*u
) {
2486 /* Returns true if the unit is inactive or going down */
2488 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)))
2491 if (u
->meta
.job
&& u
->meta
.job
->type
== JOB_STOP
)
2497 bool unit_pending_active(Unit
*u
) {
2500 /* Returns true if the unit is inactive or going down */
2502 if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
2506 (u
->meta
.job
->type
== JOB_START
||
2507 u
->meta
.job
->type
== JOB_RELOAD_OR_START
||
2508 u
->meta
.job
->type
== JOB_RESTART
))
2514 UnitType
unit_name_to_type(const char *n
) {
2519 for (t
= 0; t
< _UNIT_TYPE_MAX
; t
++)
2520 if (endswith(n
, unit_vtable
[t
]->suffix
))
2523 return _UNIT_TYPE_INVALID
;
2526 bool unit_name_is_valid(const char *n
, bool template_ok
) {
2529 t
= unit_name_to_type(n
);
2530 if (t
< 0 || t
>= _UNIT_TYPE_MAX
)
2533 return unit_name_is_valid_no_type(n
, template_ok
);
2536 int unit_kill(Unit
*u
, KillWho w
, KillMode m
, int signo
, DBusError
*error
) {
2538 assert(w
>= 0 && w
< _KILL_WHO_MAX
);
2539 assert(m
>= 0 && m
< _KILL_MODE_MAX
);
2541 assert(signo
< _NSIG
);
2546 if (!UNIT_VTABLE(u
)->kill
)
2549 return UNIT_VTABLE(u
)->kill(u
, w
, m
, signo
, error
);
2552 int unit_following_set(Unit
*u
, Set
**s
) {
2556 if (UNIT_VTABLE(u
)->following_set
)
2557 return UNIT_VTABLE(u
)->following_set(u
, s
);
2563 UnitFileState
unit_get_unit_file_state(Unit
*u
) {
2566 if (u
->meta
.unit_file_state
< 0 && u
->meta
.fragment_path
)
2567 u
->meta
.unit_file_state
= unit_file_get_state(
2568 u
->meta
.manager
->running_as
== MANAGER_SYSTEM
? UNIT_FILE_SYSTEM
: UNIT_FILE_USER
,
2569 NULL
, file_name_from_path(u
->meta
.fragment_path
));
2571 return u
->meta
.unit_file_state
;
2574 static const char* const unit_load_state_table
[_UNIT_LOAD_STATE_MAX
] = {
2575 [UNIT_STUB
] = "stub",
2576 [UNIT_LOADED
] = "loaded",
2577 [UNIT_ERROR
] = "error",
2578 [UNIT_MERGED
] = "merged",
2579 [UNIT_MASKED
] = "masked"
2582 DEFINE_STRING_TABLE_LOOKUP(unit_load_state
, UnitLoadState
);
2584 static const char* const unit_active_state_table
[_UNIT_ACTIVE_STATE_MAX
] = {
2585 [UNIT_ACTIVE
] = "active",
2586 [UNIT_RELOADING
] = "reloading",
2587 [UNIT_INACTIVE
] = "inactive",
2588 [UNIT_FAILED
] = "failed",
2589 [UNIT_ACTIVATING
] = "activating",
2590 [UNIT_DEACTIVATING
] = "deactivating"
2593 DEFINE_STRING_TABLE_LOOKUP(unit_active_state
, UnitActiveState
);
2595 static const char* const unit_dependency_table
[_UNIT_DEPENDENCY_MAX
] = {
2596 [UNIT_REQUIRES
] = "Requires",
2597 [UNIT_REQUIRES_OVERRIDABLE
] = "RequiresOverridable",
2598 [UNIT_WANTS
] = "Wants",
2599 [UNIT_REQUISITE
] = "Requisite",
2600 [UNIT_REQUISITE_OVERRIDABLE
] = "RequisiteOverridable",
2601 [UNIT_REQUIRED_BY
] = "RequiredBy",
2602 [UNIT_REQUIRED_BY_OVERRIDABLE
] = "RequiredByOverridable",
2603 [UNIT_BIND_TO
] = "BindTo",
2604 [UNIT_WANTED_BY
] = "WantedBy",
2605 [UNIT_CONFLICTS
] = "Conflicts",
2606 [UNIT_CONFLICTED_BY
] = "ConflictedBy",
2607 [UNIT_BOUND_BY
] = "BoundBy",
2608 [UNIT_BEFORE
] = "Before",
2609 [UNIT_AFTER
] = "After",
2610 [UNIT_REFERENCES
] = "References",
2611 [UNIT_REFERENCED_BY
] = "ReferencedBy",
2612 [UNIT_ON_FAILURE
] = "OnFailure"
2615 DEFINE_STRING_TABLE_LOOKUP(unit_dependency
, UnitDependency
);