1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
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>
35 #include "load-fragment.h"
36 #include "load-dropin.h"
39 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
40 [UNIT_SERVICE
] = &service_vtable
,
41 [UNIT_TIMER
] = &timer_vtable
,
42 [UNIT_SOCKET
] = &socket_vtable
,
43 [UNIT_TARGET
] = &target_vtable
,
44 [UNIT_DEVICE
] = &device_vtable
,
45 [UNIT_MOUNT
] = &mount_vtable
,
46 [UNIT_AUTOMOUNT
] = &automount_vtable
,
47 [UNIT_SNAPSHOT
] = &snapshot_vtable
50 UnitType
unit_name_to_type(const char *n
) {
55 for (t
= 0; t
< _UNIT_TYPE_MAX
; t
++)
56 if (endswith(n
, unit_vtable
[t
]->suffix
))
59 return _UNIT_TYPE_INVALID
;
64 "abcdefghijklmnopqrstuvwxyz" \
65 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
68 bool unit_name_is_valid(const char *n
) {
74 if (strlen(n
) >= UNIT_NAME_MAX
)
77 t
= unit_name_to_type(n
);
78 if (t
< 0 || t
>= _UNIT_TYPE_MAX
)
81 if (!(e
= strrchr(n
, '.')))
87 for (i
= n
; i
< e
; i
++)
88 if (!strchr(VALID_CHARS
, *i
))
94 char *unit_name_change_suffix(const char *n
, const char *suffix
) {
99 assert(unit_name_is_valid(n
));
102 assert_se(e
= strrchr(n
, '.'));
106 if (!(r
= new(char, a
+ b
+ 1)))
110 memcpy(r
+a
, suffix
, b
+1);
115 Unit
*unit_new(Manager
*m
) {
120 if (!(u
= new0(Unit
, 1)))
123 if (!(u
->meta
.names
= set_new(string_hash_func
, string_compare_func
))) {
129 u
->meta
.type
= _UNIT_TYPE_INVALID
;
134 bool unit_has_name(Unit
*u
, const char *name
) {
138 return !!set_get(u
->meta
.names
, (char*) name
);
141 int unit_add_name(Unit
*u
, const char *text
) {
149 if (!unit_name_is_valid(text
))
152 if ((t
= unit_name_to_type(text
)) == _UNIT_TYPE_INVALID
)
155 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
&& t
!= u
->meta
.type
)
158 if (!(s
= strdup(text
)))
161 if ((r
= set_put(u
->meta
.names
, s
)) < 0) {
170 if ((r
= hashmap_put(u
->meta
.manager
->units
, s
, u
)) < 0) {
171 set_remove(u
->meta
.names
, s
);
176 if (u
->meta
.type
== _UNIT_TYPE_INVALID
)
177 LIST_PREPEND(Meta
, units_per_type
, u
->meta
.manager
->units_per_type
[t
], &u
->meta
);
184 unit_add_to_dbus_queue(u
);
188 int unit_choose_id(Unit
*u
, const char *name
) {
194 /* Selects one of the names of this unit as the id */
196 if (!(s
= set_get(u
->meta
.names
, (char*) name
)))
201 unit_add_to_dbus_queue(u
);
205 int unit_set_description(Unit
*u
, const char *description
) {
210 if (!(s
= strdup(description
)))
213 free(u
->meta
.description
);
214 u
->meta
.description
= s
;
216 unit_add_to_dbus_queue(u
);
220 void unit_add_to_load_queue(Unit
*u
) {
223 if (u
->meta
.load_state
!= UNIT_STUB
|| u
->meta
.in_load_queue
)
226 LIST_PREPEND(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
227 u
->meta
.in_load_queue
= true;
230 void unit_add_to_cleanup_queue(Unit
*u
) {
233 if (u
->meta
.in_cleanup_queue
)
236 LIST_PREPEND(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
237 u
->meta
.in_cleanup_queue
= true;
240 void unit_add_to_dbus_queue(Unit
*u
) {
243 if (u
->meta
.load_state
== UNIT_STUB
|| u
->meta
.in_dbus_queue
|| set_isempty(u
->meta
.manager
->subscribed
))
246 LIST_PREPEND(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
247 u
->meta
.in_dbus_queue
= true;
250 static void bidi_set_free(Unit
*u
, Set
*s
) {
256 /* Frees the set and makes sure we are dropped from the
257 * inverse pointers */
259 SET_FOREACH(other
, s
, i
) {
262 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
263 set_remove(other
->meta
.dependencies
[d
], u
);
269 void unit_free(Unit
*u
) {
276 bus_unit_send_removed_signal(u
);
278 /* Detach from next 'bigger' objects */
280 cgroup_bonding_free_list(u
->meta
.cgroup_bondings
);
282 SET_FOREACH(t
, u
->meta
.names
, i
)
283 hashmap_remove_value(u
->meta
.manager
->units
, t
, u
);
285 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
)
286 LIST_REMOVE(Meta
, units_per_type
, u
->meta
.manager
->units_per_type
[u
->meta
.type
], &u
->meta
);
288 if (u
->meta
.in_load_queue
)
289 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
291 if (u
->meta
.in_dbus_queue
)
292 LIST_REMOVE(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
294 if (u
->meta
.in_cleanup_queue
)
295 LIST_REMOVE(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
297 if (u
->meta
.load_state
!= UNIT_STUB
)
298 if (UNIT_VTABLE(u
)->done
)
299 UNIT_VTABLE(u
)->done(u
);
301 /* Free data and next 'smaller' objects */
303 job_free(u
->meta
.job
);
305 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
306 bidi_set_free(u
, u
->meta
.dependencies
[d
]);
308 free(u
->meta
.description
);
309 free(u
->meta
.fragment_path
);
311 while ((t
= set_steal_first(u
->meta
.names
)))
313 set_free(u
->meta
.names
);
318 UnitActiveState
unit_active_state(Unit
*u
) {
321 if (u
->meta
.load_state
!= UNIT_LOADED
)
322 return UNIT_INACTIVE
;
324 return UNIT_VTABLE(u
)->active_state(u
);
327 static void complete_move(Set
**s
, Set
**other
) {
335 set_move(*s
, *other
);
342 static void merge_names(Unit
*u
, Unit
*other
) {
349 complete_move(&u
->meta
.names
, &other
->meta
.names
);
351 while ((t
= set_steal_first(other
->meta
.names
)))
354 set_free(other
->meta
.names
);
355 other
->meta
.names
= NULL
;
356 other
->meta
.id
= NULL
;
358 SET_FOREACH(t
, u
->meta
.names
, i
)
359 assert_se(hashmap_replace(u
->meta
.manager
->units
, t
, u
) == 0);
362 static void merge_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
369 assert(d
< _UNIT_DEPENDENCY_MAX
);
371 SET_FOREACH(back
, other
->meta
.dependencies
[d
], i
) {
374 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++)
375 if ((r
= set_remove_and_put(back
->meta
.dependencies
[k
], other
, u
)) < 0) {
378 set_remove(back
->meta
.dependencies
[k
], other
);
380 assert(r
== -ENOENT
);
384 complete_move(&u
->meta
.dependencies
[d
], &other
->meta
.dependencies
[d
]);
386 set_free(other
->meta
.dependencies
[d
]);
387 other
->meta
.dependencies
[d
] = NULL
;
390 int unit_merge(Unit
*u
, Unit
*other
) {
395 assert(u
->meta
.manager
== other
->meta
.manager
);
400 /* This merges 'other' into 'unit'. FIXME: This does not
401 * rollback on failure. */
403 if (u
->meta
.type
!= u
->meta
.type
)
406 if (other
->meta
.load_state
!= UNIT_STUB
)
410 merge_names(u
, other
);
412 /* Merge dependencies */
413 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
414 merge_dependencies(u
, other
, d
);
416 unit_add_to_dbus_queue(u
);
418 other
->meta
.load_state
= UNIT_MERGED
;
419 other
->meta
.merged_into
= u
;
421 unit_add_to_cleanup_queue(other
);
426 int unit_merge_by_name(Unit
*u
, const char *name
) {
432 if (!(other
= manager_get_unit(u
->meta
.manager
, name
)))
433 return unit_add_name(u
, name
);
435 return unit_merge(u
, other
);
438 Unit
* unit_follow_merge(Unit
*u
) {
441 while (u
->meta
.load_state
== UNIT_MERGED
)
442 assert_se(u
= u
->meta
.merged_into
);
447 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
453 if (c
->output
!= EXEC_OUTPUT_KERNEL
&& c
->output
!= EXEC_OUTPUT_SYSLOG
)
456 /* If syslog or kernel logging is requested, make sure our own
457 * logging daemon is run first. */
459 if ((r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_LOGGER_SOCKET
)) < 0)
462 if (u
->meta
.manager
->running_as
!= MANAGER_SESSION
)
463 if ((r
= unit_add_dependency_by_name(u
, UNIT_REQUIRES
, SPECIAL_LOGGER_SOCKET
)) < 0)
469 const char* unit_id(Unit
*u
) {
475 return set_first(u
->meta
.names
);
478 const char *unit_description(Unit
*u
) {
481 if (u
->meta
.description
)
482 return u
->meta
.description
;
487 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
499 p2
= strappend(prefix
, "\t");
500 prefix2
= p2
? p2
: prefix
;
504 "%s\tDescription: %s\n"
505 "%s\tUnit Load State: %s\n"
506 "%s\tUnit Active State: %s\n",
508 prefix
, unit_description(u
),
509 prefix
, unit_load_state_to_string(u
->meta
.load_state
),
510 prefix
, unit_active_state_to_string(unit_active_state(u
)));
512 SET_FOREACH(t
, u
->meta
.names
, i
)
513 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
515 if (u
->meta
.fragment_path
)
516 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->meta
.fragment_path
);
518 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
521 if (set_isempty(u
->meta
.dependencies
[d
]))
524 SET_FOREACH(other
, u
->meta
.dependencies
[d
], i
)
525 fprintf(f
, "%s\t%s: %s\n", prefix
, unit_dependency_to_string(d
), unit_id(other
));
529 "%s\tRecursive Stop: %s\n"
530 "%s\tStop When Unneeded: %s\n",
531 prefix
, yes_no(u
->meta
.recursive_stop
),
532 prefix
, yes_no(u
->meta
.stop_when_unneeded
));
534 if (u
->meta
.load_state
== UNIT_LOADED
) {
535 LIST_FOREACH(by_unit
, b
, u
->meta
.cgroup_bondings
)
536 fprintf(f
, "%s\tControlGroup: %s:%s\n",
537 prefix
, b
->controller
, b
->path
);
539 if (UNIT_VTABLE(u
)->dump
)
540 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
544 job_dump(u
->meta
.job
, f
, prefix2
);
549 /* Common implementation for multiple backends */
550 int unit_load_fragment_and_dropin(Unit
*u
, UnitLoadState
*new_state
) {
555 assert(*new_state
== UNIT_STUB
|| *new_state
== UNIT_LOADED
);
557 /* Load a .service file */
558 if ((r
= unit_load_fragment(u
, new_state
)) < 0)
561 if (*new_state
== UNIT_STUB
)
564 /* Load drop-in directory data */
565 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
571 /* Common implementation for multiple backends */
572 int unit_load_fragment_and_dropin_optional(Unit
*u
, UnitLoadState
*new_state
) {
577 assert(*new_state
== UNIT_STUB
|| *new_state
== UNIT_LOADED
);
579 /* Same as unit_load_fragment_and_dropin(), but whether
580 * something can be loaded or not doesn't matter. */
582 /* Load a .service file */
583 if ((r
= unit_load_fragment(u
, new_state
)) < 0)
586 if (*new_state
== UNIT_STUB
)
587 *new_state
= UNIT_LOADED
;
589 /* Load drop-in directory data */
590 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
596 int unit_load(Unit
*u
) {
602 if (u
->meta
.in_load_queue
) {
603 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
604 u
->meta
.in_load_queue
= false;
607 if (u
->meta
.load_state
!= UNIT_STUB
)
610 if (UNIT_VTABLE(u
)->init
) {
612 if ((r
= UNIT_VTABLE(u
)->init(u
, &res
)) < 0)
616 if (res
== UNIT_STUB
) {
621 u
->meta
.load_state
= res
;
622 assert((u
->meta
.load_state
!= UNIT_MERGED
) == !u
->meta
.merged_into
);
624 unit_add_to_dbus_queue(unit_follow_merge(u
));
629 u
->meta
.load_state
= UNIT_FAILED
;
630 unit_add_to_dbus_queue(u
);
632 log_error("Failed to load configuration for %s: %s", unit_id(u
), strerror(-r
));
638 * -EBADR: This unit type does not support starting.
639 * -EALREADY: Unit is already started.
640 * -EAGAIN: An operation is already in progress. Retry later.
642 int unit_start(Unit
*u
) {
643 UnitActiveState state
;
647 /* If this is already (being) started, then this will
648 * succeed. Note that this will even succeed if this unit is
649 * not startable by the user. This is relied on to detect when
650 * we need to wait for units and when waiting is finished. */
651 state
= unit_active_state(u
);
652 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
655 /* If it is stopped, but we cannot start it, then fail */
656 if (!UNIT_VTABLE(u
)->start
)
659 /* We don't suppress calls to ->start() here when we are
660 * already starting, to allow this request to be used as a
661 * "hurry up" call, for example when the unit is in some "auto
662 * restart" state where it waits for a holdoff timer to elapse
663 * before it will start again. */
665 unit_add_to_dbus_queue(u
);
666 return UNIT_VTABLE(u
)->start(u
);
669 bool unit_can_start(Unit
*u
) {
672 return !!UNIT_VTABLE(u
)->start
;
676 * -EBADR: This unit type does not support stopping.
677 * -EALREADY: Unit is already stopped.
678 * -EAGAIN: An operation is already in progress. Retry later.
680 int unit_stop(Unit
*u
) {
681 UnitActiveState state
;
685 state
= unit_active_state(u
);
686 if (state
== UNIT_INACTIVE
)
689 if (!UNIT_VTABLE(u
)->stop
)
692 if (state
== UNIT_DEACTIVATING
)
695 unit_add_to_dbus_queue(u
);
696 return UNIT_VTABLE(u
)->stop(u
);
700 * -EBADR: This unit type does not support reloading.
701 * -ENOEXEC: Unit is not started.
702 * -EAGAIN: An operation is already in progress. Retry later.
704 int unit_reload(Unit
*u
) {
705 UnitActiveState state
;
709 if (!unit_can_reload(u
))
712 state
= unit_active_state(u
);
713 if (unit_active_state(u
) == UNIT_ACTIVE_RELOADING
)
716 if (unit_active_state(u
) != UNIT_ACTIVE
)
719 unit_add_to_dbus_queue(u
);
720 return UNIT_VTABLE(u
)->reload(u
);
723 bool unit_can_reload(Unit
*u
) {
726 if (!UNIT_VTABLE(u
)->reload
)
729 if (!UNIT_VTABLE(u
)->can_reload
)
732 return UNIT_VTABLE(u
)->can_reload(u
);
735 static void unit_check_uneeded(Unit
*u
) {
741 /* If this service shall be shut down when unneeded then do
744 if (!u
->meta
.stop_when_unneeded
)
747 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
750 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
751 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
754 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUIRED_BY
], i
)
755 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
758 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTED_BY
], i
)
759 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
762 log_debug("Service %s is not needed anymore. Stopping.", unit_id(u
));
764 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
765 manager_add_job(u
->meta
.manager
, JOB_STOP
, u
, JOB_FAIL
, true, NULL
);
768 static void retroactively_start_dependencies(Unit
*u
) {
773 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
775 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
776 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
777 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
779 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUIRES
], i
)
780 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
781 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
783 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
784 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
785 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
787 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
788 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
789 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
791 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
792 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
793 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
796 static void retroactively_stop_dependencies(Unit
*u
) {
801 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
803 if (u
->meta
.recursive_stop
) {
804 /* Pull down units need us recursively if enabled */
805 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
806 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
807 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
810 /* Garbage collect services that might not be needed anymore, if enabled */
811 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
812 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
813 unit_check_uneeded(other
);
814 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUIRES
], i
)
815 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
816 unit_check_uneeded(other
);
817 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
818 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
819 unit_check_uneeded(other
);
820 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
821 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
822 unit_check_uneeded(other
);
823 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUISITE
], i
)
824 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
825 unit_check_uneeded(other
);
828 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
) {
829 bool unexpected
= false;
832 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
833 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
834 assert(!(os
== UNIT_ACTIVE
&& ns
== UNIT_ACTIVATING
));
835 assert(!(os
== UNIT_INACTIVE
&& ns
== UNIT_DEACTIVATING
));
840 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
841 u
->meta
.active_enter_timestamp
= now(CLOCK_REALTIME
);
842 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
843 u
->meta
.active_exit_timestamp
= now(CLOCK_REALTIME
);
847 if (u
->meta
.job
->state
== JOB_WAITING
)
849 /* So we reached a different state for this
850 * job. Let's see if we can run it now if it
851 * failed previously due to EAGAIN. */
852 job_add_to_run_queue(u
->meta
.job
);
855 assert(u
->meta
.job
->state
== JOB_RUNNING
);
857 /* Let's check whether this state change
858 * constitutes a finished job, or maybe
859 * cotradicts a running job and hence needs to
860 * invalidate jobs. */
862 switch (u
->meta
.job
->type
) {
865 case JOB_VERIFY_ACTIVE
:
867 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
868 job_finish_and_invalidate(u
->meta
.job
, true);
869 else if (ns
!= UNIT_ACTIVATING
) {
871 job_finish_and_invalidate(u
->meta
.job
, false);
877 case JOB_RELOAD_OR_START
:
879 if (ns
== UNIT_ACTIVE
)
880 job_finish_and_invalidate(u
->meta
.job
, true);
881 else if (ns
!= UNIT_ACTIVATING
&& ns
!= UNIT_ACTIVE_RELOADING
) {
883 job_finish_and_invalidate(u
->meta
.job
, false);
890 case JOB_TRY_RESTART
:
892 if (ns
== UNIT_INACTIVE
)
893 job_finish_and_invalidate(u
->meta
.job
, true);
894 else if (ns
!= UNIT_DEACTIVATING
) {
896 job_finish_and_invalidate(u
->meta
.job
, false);
902 assert_not_reached("Job type unknown");
907 /* If this state change happened without being requested by a
908 * job, then let's retroactively start or stop dependencies */
911 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
912 retroactively_start_dependencies(u
);
913 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
914 retroactively_stop_dependencies(u
);
917 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
919 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
)) {
920 log_info("D-Bus became available, trying to reconnect.");
921 /* The bus just got started, hence try to connect to it. */
922 bus_init_system(u
->meta
.manager
);
923 bus_init_api(u
->meta
.manager
);
926 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
)) {
927 /* The syslog daemon just got started, hence try to connect to it. */
928 log_info("Syslog became available, trying to reconnect.");
932 } else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
934 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
))
935 /* The syslog daemon just got terminated, hence try to disconnect from it. */
938 /* We don't care about D-Bus here, since we'll get an
939 * asynchronous notification for it anyway. */
942 /* Maybe we finished startup and are now ready for being
943 * stopped because unneeded? */
944 unit_check_uneeded(u
);
946 unit_add_to_dbus_queue(u
);
949 int unit_watch_fd(Unit
*u
, int fd
, uint32_t events
, Watch
*w
) {
950 struct epoll_event ev
;
955 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_FD
&& w
->fd
== fd
&& w
->data
.unit
== u
));
961 if (epoll_ctl(u
->meta
.manager
->epoll_fd
,
962 w
->type
== WATCH_INVALID
? EPOLL_CTL_ADD
: EPOLL_CTL_MOD
,
974 void unit_unwatch_fd(Unit
*u
, Watch
*w
) {
978 if (w
->type
== WATCH_INVALID
)
981 assert(w
->type
== WATCH_FD
);
982 assert(w
->data
.unit
== u
);
983 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
986 w
->type
= WATCH_INVALID
;
990 int unit_watch_pid(Unit
*u
, pid_t pid
) {
994 return hashmap_put(u
->meta
.manager
->watch_pids
, UINT32_TO_PTR(pid
), u
);
997 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
1001 hashmap_remove(u
->meta
.manager
->watch_pids
, UINT32_TO_PTR(pid
));
1004 int unit_watch_timer(Unit
*u
, usec_t delay
, Watch
*w
) {
1005 struct itimerspec its
;
1011 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_TIMER
&& w
->data
.unit
== u
));
1013 /* This will try to reuse the old timer if there is one */
1015 if (w
->type
== WATCH_TIMER
) {
1020 if ((fd
= timerfd_create(CLOCK_MONOTONIC
, TFD_NONBLOCK
|TFD_CLOEXEC
)) < 0)
1027 /* Set absolute time in the past, but not 0, since we
1028 * don't want to disarm the timer */
1029 its
.it_value
.tv_sec
= 0;
1030 its
.it_value
.tv_nsec
= 1;
1032 flags
= TFD_TIMER_ABSTIME
;
1034 timespec_store(&its
.it_value
, delay
);
1038 /* This will also flush the elapse counter */
1039 if (timerfd_settime(fd
, flags
, &its
, NULL
) < 0)
1042 if (w
->type
== WATCH_INVALID
) {
1043 struct epoll_event ev
;
1047 ev
.events
= EPOLLIN
;
1049 if (epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_ADD
, fd
, &ev
) < 0)
1054 w
->type
= WATCH_TIMER
;
1061 close_nointr_nofail(fd
);
1066 void unit_unwatch_timer(Unit
*u
, Watch
*w
) {
1070 if (w
->type
== WATCH_INVALID
)
1073 assert(w
->type
== WATCH_TIMER
&& w
->data
.unit
== u
);
1075 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1076 assert_se(close_nointr(w
->fd
) == 0);
1079 w
->type
= WATCH_INVALID
;
1080 w
->data
.unit
= NULL
;
1083 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
1085 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
1089 case JOB_VERIFY_ACTIVE
:
1095 case JOB_TRY_RESTART
:
1096 return unit_can_start(u
);
1099 return unit_can_reload(u
);
1101 case JOB_RELOAD_OR_START
:
1102 return unit_can_reload(u
) && unit_can_start(u
);
1105 assert_not_reached("Invalid job type");
1109 int unit_add_dependency(Unit
*u
, UnitDependency d
, Unit
*other
) {
1111 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
1112 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
1113 [UNIT_SOFT_REQUIRES
] = UNIT_SOFT_REQUIRED_BY
,
1114 [UNIT_WANTS
] = UNIT_WANTED_BY
,
1115 [UNIT_REQUISITE
] = UNIT_REQUIRED_BY
,
1116 [UNIT_SOFT_REQUISITE
] = UNIT_SOFT_REQUIRED_BY
,
1117 [UNIT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1118 [UNIT_SOFT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1119 [UNIT_WANTED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1120 [UNIT_CONFLICTS
] = UNIT_CONFLICTS
,
1121 [UNIT_BEFORE
] = UNIT_AFTER
,
1122 [UNIT_AFTER
] = UNIT_BEFORE
1127 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
1128 assert(inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
);
1131 /* We won't allow dependencies on ourselves. We will not
1132 * consider them an error however. */
1136 if ((r
= set_ensure_allocated(&u
->meta
.dependencies
[d
], trivial_hash_func
, trivial_compare_func
)) < 0)
1139 if ((r
= set_ensure_allocated(&other
->meta
.dependencies
[inverse_table
[d
]], trivial_hash_func
, trivial_compare_func
)) < 0)
1142 if ((r
= set_put(u
->meta
.dependencies
[d
], other
)) < 0)
1145 if ((r
= set_put(other
->meta
.dependencies
[inverse_table
[d
]], u
)) < 0) {
1146 set_remove(u
->meta
.dependencies
[d
], other
);
1150 unit_add_to_dbus_queue(u
);
1154 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
) {
1158 if ((r
= manager_load_unit(u
->meta
.manager
, name
, &other
)) < 0)
1161 if ((r
= unit_add_dependency(u
, d
, other
)) < 0)
1167 int unit_add_dependency_by_name_inverse(Unit
*u
, UnitDependency d
, const char *name
) {
1171 if ((r
= manager_load_unit(u
->meta
.manager
, name
, &other
)) < 0)
1174 if ((r
= unit_add_dependency(other
, d
, u
)) < 0)
1180 int set_unit_path(const char *p
) {
1184 /* This is mostly for debug purposes */
1186 if (path_is_absolute(p
)) {
1187 if (!(c
= strdup(p
)))
1190 if (!(cwd
= get_current_dir_name()))
1193 r
= asprintf(&c
, "%s/%s", cwd
, p
);
1200 if (setenv("SYSTEMD_UNIT_PATH", c
, 0) < 0) {
1209 char *unit_name_escape_path(const char *path
, const char *suffix
) {
1216 /* Takes a path and a suffix and prefix and makes a nice
1217 * string suitable as unit name of it, escaping all weird
1220 * / becomes ., and all chars not alloweed in a unit name get
1221 * escaped as \xFF, including \ and ., of course. This
1222 * escaping is hence reversible.
1231 if (!(r
= new(char, a
*4+b
+1)))
1234 for (f
= path
, t
= r
; *f
; f
++) {
1237 else if (*f
== '.' || *f
== '\\' || !strchr(VALID_CHARS
, *f
)) {
1240 *(t
++) = hexchar(*f
> 4);
1241 *(t
++) = hexchar(*f
);
1246 memcpy(t
, suffix
, b
+1);
1251 char *unit_dbus_path(Unit
*u
) {
1256 if (!(e
= bus_path_escape(unit_id(u
))))
1259 if (asprintf(&p
, "/org/freedesktop/systemd1/unit/%s", e
) < 0) {
1268 int unit_add_cgroup(Unit
*u
, CGroupBonding
*b
) {
1276 /* Ensure this hasn't been added yet */
1279 l
= hashmap_get(u
->meta
.manager
->cgroup_bondings
, b
->path
);
1280 LIST_PREPEND(CGroupBonding
, by_path
, l
, b
);
1282 if ((r
= hashmap_replace(u
->meta
.manager
->cgroup_bondings
, b
->path
, l
)) < 0) {
1283 LIST_REMOVE(CGroupBonding
, by_path
, l
, b
);
1287 LIST_PREPEND(CGroupBonding
, by_unit
, u
->meta
.cgroup_bondings
, b
);
1293 int unit_add_cgroup_from_text(Unit
*u
, const char *name
) {
1303 /* Detect controller name */
1304 n
= strcspn(name
, ":/");
1306 /* Only controller name, no path? No path? */
1318 /* Insist in absolute paths */
1322 if (!(controller
= strndup(name
, n
)))
1325 if (cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, controller
)) {
1330 if (!(b
= new0(CGroupBonding
, 1))) {
1335 b
->controller
= controller
;
1337 if (!(b
->path
= strdup(p
))) {
1343 b
->clean_up
= false;
1345 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1352 free(b
->controller
);
1358 int unit_add_default_cgroup(Unit
*u
) {
1364 /* Adds in the default cgroup data, if it wasn't specified yet */
1366 if (unit_get_default_cgroup(u
))
1369 if (!(b
= new0(CGroupBonding
, 1)))
1372 if (!(b
->controller
= strdup(u
->meta
.manager
->cgroup_controller
)))
1375 if (asprintf(&b
->path
, "%s/%s", u
->meta
.manager
->cgroup_hierarchy
, unit_id(u
)) < 0)
1381 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1388 free(b
->controller
);
1394 CGroupBonding
* unit_get_default_cgroup(Unit
*u
) {
1397 return cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, u
->meta
.manager
->cgroup_controller
);
1400 static const char* const unit_type_table
[_UNIT_TYPE_MAX
] = {
1401 [UNIT_SERVICE
] = "service",
1402 [UNIT_TIMER
] = "timer",
1403 [UNIT_SOCKET
] = "socket",
1404 [UNIT_TARGET
] = "target",
1405 [UNIT_DEVICE
] = "device",
1406 [UNIT_MOUNT
] = "mount",
1407 [UNIT_AUTOMOUNT
] = "automount",
1408 [UNIT_SNAPSHOT
] = "snapshot"
1411 DEFINE_STRING_TABLE_LOOKUP(unit_type
, UnitType
);
1413 static const char* const unit_load_state_table
[_UNIT_LOAD_STATE_MAX
] = {
1414 [UNIT_STUB
] = "stub",
1415 [UNIT_LOADED
] = "loaded",
1416 [UNIT_FAILED
] = "failed",
1417 [UNIT_MERGED
] = "merged"
1420 DEFINE_STRING_TABLE_LOOKUP(unit_load_state
, UnitLoadState
);
1422 static const char* const unit_active_state_table
[_UNIT_ACTIVE_STATE_MAX
] = {
1423 [UNIT_ACTIVE
] = "active",
1424 [UNIT_INACTIVE
] = "inactive",
1425 [UNIT_ACTIVATING
] = "activating",
1426 [UNIT_DEACTIVATING
] = "deactivating"
1429 DEFINE_STRING_TABLE_LOOKUP(unit_active_state
, UnitActiveState
);
1431 static const char* const unit_dependency_table
[_UNIT_DEPENDENCY_MAX
] = {
1432 [UNIT_REQUIRES
] = "Requires",
1433 [UNIT_SOFT_REQUIRES
] = "SoftRequires",
1434 [UNIT_WANTS
] = "Wants",
1435 [UNIT_REQUISITE
] = "Requisite",
1436 [UNIT_SOFT_REQUISITE
] = "SoftRequisite",
1437 [UNIT_REQUIRED_BY
] = "RequiredBy",
1438 [UNIT_SOFT_REQUIRED_BY
] = "SoftRequiredBy",
1439 [UNIT_WANTED_BY
] = "WantedBy",
1440 [UNIT_CONFLICTS
] = "Conflicts",
1441 [UNIT_BEFORE
] = "Before",
1442 [UNIT_AFTER
] = "After",
1445 DEFINE_STRING_TABLE_LOOKUP(unit_dependency
, UnitDependency
);
1447 static const char* const kill_mode_table
[_KILL_MODE_MAX
] = {
1448 [KILL_PROCESS
] = "process",
1449 [KILL_PROCESS_GROUP
] = "process-group",
1450 [KILL_CONTROL_GROUP
] = "control-group"
1453 DEFINE_STRING_TABLE_LOOKUP(kill_mode
, KillMode
);