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
);
397 other
= unit_follow_merge(other
);
402 /* This merges 'other' into 'unit'. FIXME: This does not
403 * rollback on failure. */
405 if (u
->meta
.type
!= u
->meta
.type
)
408 if (other
->meta
.load_state
!= UNIT_STUB
&&
409 other
->meta
.load_state
!= UNIT_FAILED
)
413 merge_names(u
, other
);
415 /* Merge dependencies */
416 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
417 merge_dependencies(u
, other
, d
);
419 unit_add_to_dbus_queue(u
);
421 other
->meta
.load_state
= UNIT_MERGED
;
422 other
->meta
.merged_into
= u
;
424 unit_add_to_cleanup_queue(other
);
429 int unit_merge_by_name(Unit
*u
, const char *name
) {
435 if (!(other
= manager_get_unit(u
->meta
.manager
, name
)))
436 return unit_add_name(u
, name
);
438 return unit_merge(u
, other
);
441 Unit
* unit_follow_merge(Unit
*u
) {
444 while (u
->meta
.load_state
== UNIT_MERGED
)
445 assert_se(u
= u
->meta
.merged_into
);
450 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
456 if (c
->output
!= EXEC_OUTPUT_KERNEL
&& c
->output
!= EXEC_OUTPUT_SYSLOG
)
459 /* If syslog or kernel logging is requested, make sure our own
460 * logging daemon is run first. */
462 if ((r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_LOGGER_SOCKET
)) < 0)
465 if (u
->meta
.manager
->running_as
!= MANAGER_SESSION
)
466 if ((r
= unit_add_dependency_by_name(u
, UNIT_REQUIRES
, SPECIAL_LOGGER_SOCKET
)) < 0)
472 const char* unit_id(Unit
*u
) {
478 return set_first(u
->meta
.names
);
481 const char *unit_description(Unit
*u
) {
484 if (u
->meta
.description
)
485 return u
->meta
.description
;
490 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
502 p2
= strappend(prefix
, "\t");
503 prefix2
= p2
? p2
: prefix
;
507 "%s\tDescription: %s\n"
508 "%s\tUnit Load State: %s\n"
509 "%s\tUnit Active State: %s\n",
511 prefix
, unit_description(u
),
512 prefix
, unit_load_state_to_string(u
->meta
.load_state
),
513 prefix
, unit_active_state_to_string(unit_active_state(u
)));
515 SET_FOREACH(t
, u
->meta
.names
, i
)
516 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
518 if (u
->meta
.fragment_path
)
519 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->meta
.fragment_path
);
521 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
524 if (set_isempty(u
->meta
.dependencies
[d
]))
527 SET_FOREACH(other
, u
->meta
.dependencies
[d
], i
)
528 fprintf(f
, "%s\t%s: %s\n", prefix
, unit_dependency_to_string(d
), unit_id(other
));
532 "%s\tRecursive Stop: %s\n"
533 "%s\tStop When Unneeded: %s\n",
534 prefix
, yes_no(u
->meta
.recursive_stop
),
535 prefix
, yes_no(u
->meta
.stop_when_unneeded
));
537 if (u
->meta
.load_state
== UNIT_LOADED
) {
538 LIST_FOREACH(by_unit
, b
, u
->meta
.cgroup_bondings
)
539 fprintf(f
, "%s\tControlGroup: %s:%s\n",
540 prefix
, b
->controller
, b
->path
);
542 if (UNIT_VTABLE(u
)->dump
)
543 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
547 job_dump(u
->meta
.job
, f
, prefix2
);
552 /* Common implementation for multiple backends */
553 int unit_load_fragment_and_dropin(Unit
*u
, UnitLoadState
*new_state
) {
558 assert(*new_state
== UNIT_STUB
|| *new_state
== UNIT_LOADED
);
560 /* Load a .service file */
561 if ((r
= unit_load_fragment(u
, new_state
)) < 0)
564 if (*new_state
== UNIT_STUB
)
567 /* Load drop-in directory data */
568 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
574 /* Common implementation for multiple backends */
575 int unit_load_fragment_and_dropin_optional(Unit
*u
, UnitLoadState
*new_state
) {
580 assert(*new_state
== UNIT_STUB
|| *new_state
== UNIT_LOADED
);
582 /* Same as unit_load_fragment_and_dropin(), but whether
583 * something can be loaded or not doesn't matter. */
585 /* Load a .service file */
586 if ((r
= unit_load_fragment(u
, new_state
)) < 0)
589 if (*new_state
== UNIT_STUB
)
590 *new_state
= UNIT_LOADED
;
592 /* Load drop-in directory data */
593 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
599 int unit_load(Unit
*u
) {
605 if (u
->meta
.in_load_queue
) {
606 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
607 u
->meta
.in_load_queue
= false;
610 if (u
->meta
.load_state
!= UNIT_STUB
)
613 if (UNIT_VTABLE(u
)->init
) {
615 if ((r
= UNIT_VTABLE(u
)->init(u
, &res
)) < 0)
619 if (res
== UNIT_STUB
) {
624 u
->meta
.load_state
= res
;
625 assert((u
->meta
.load_state
!= UNIT_MERGED
) == !u
->meta
.merged_into
);
627 unit_add_to_dbus_queue(unit_follow_merge(u
));
632 u
->meta
.load_state
= UNIT_FAILED
;
633 unit_add_to_dbus_queue(u
);
635 log_error("Failed to load configuration for %s: %s", unit_id(u
), strerror(-r
));
641 * -EBADR: This unit type does not support starting.
642 * -EALREADY: Unit is already started.
643 * -EAGAIN: An operation is already in progress. Retry later.
645 int unit_start(Unit
*u
) {
646 UnitActiveState state
;
650 /* If this is already (being) started, then this will
651 * succeed. Note that this will even succeed if this unit is
652 * not startable by the user. This is relied on to detect when
653 * we need to wait for units and when waiting is finished. */
654 state
= unit_active_state(u
);
655 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
658 /* If it is stopped, but we cannot start it, then fail */
659 if (!UNIT_VTABLE(u
)->start
)
662 /* We don't suppress calls to ->start() here when we are
663 * already starting, to allow this request to be used as a
664 * "hurry up" call, for example when the unit is in some "auto
665 * restart" state where it waits for a holdoff timer to elapse
666 * before it will start again. */
668 unit_add_to_dbus_queue(u
);
669 return UNIT_VTABLE(u
)->start(u
);
672 bool unit_can_start(Unit
*u
) {
675 return !!UNIT_VTABLE(u
)->start
;
679 * -EBADR: This unit type does not support stopping.
680 * -EALREADY: Unit is already stopped.
681 * -EAGAIN: An operation is already in progress. Retry later.
683 int unit_stop(Unit
*u
) {
684 UnitActiveState state
;
688 state
= unit_active_state(u
);
689 if (state
== UNIT_INACTIVE
)
692 if (!UNIT_VTABLE(u
)->stop
)
695 if (state
== UNIT_DEACTIVATING
)
698 unit_add_to_dbus_queue(u
);
699 return UNIT_VTABLE(u
)->stop(u
);
703 * -EBADR: This unit type does not support reloading.
704 * -ENOEXEC: Unit is not started.
705 * -EAGAIN: An operation is already in progress. Retry later.
707 int unit_reload(Unit
*u
) {
708 UnitActiveState state
;
712 if (!unit_can_reload(u
))
715 state
= unit_active_state(u
);
716 if (unit_active_state(u
) == UNIT_ACTIVE_RELOADING
)
719 if (unit_active_state(u
) != UNIT_ACTIVE
)
722 unit_add_to_dbus_queue(u
);
723 return UNIT_VTABLE(u
)->reload(u
);
726 bool unit_can_reload(Unit
*u
) {
729 if (!UNIT_VTABLE(u
)->reload
)
732 if (!UNIT_VTABLE(u
)->can_reload
)
735 return UNIT_VTABLE(u
)->can_reload(u
);
738 static void unit_check_uneeded(Unit
*u
) {
744 /* If this service shall be shut down when unneeded then do
747 if (!u
->meta
.stop_when_unneeded
)
750 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
753 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
754 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
757 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUIRED_BY
], i
)
758 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
761 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTED_BY
], i
)
762 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
765 log_debug("Service %s is not needed anymore. Stopping.", unit_id(u
));
767 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
768 manager_add_job(u
->meta
.manager
, JOB_STOP
, u
, JOB_FAIL
, true, NULL
);
771 static void retroactively_start_dependencies(Unit
*u
) {
776 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
778 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
779 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
780 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
782 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUIRES
], i
)
783 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
784 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
786 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
787 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
788 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
790 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
791 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
792 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
794 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
795 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
796 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
799 static void retroactively_stop_dependencies(Unit
*u
) {
804 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
806 if (u
->meta
.recursive_stop
) {
807 /* Pull down units need us recursively if enabled */
808 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
809 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
810 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
813 /* Garbage collect services that might not be needed anymore, if enabled */
814 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_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_SOFT_REQUIRES
], 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_WANTS
], 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_REQUISITE
], i
)
824 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
825 unit_check_uneeded(other
);
826 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUISITE
], i
)
827 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
828 unit_check_uneeded(other
);
831 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
) {
832 bool unexpected
= false;
835 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
836 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
837 assert(!(os
== UNIT_ACTIVE
&& ns
== UNIT_ACTIVATING
));
838 assert(!(os
== UNIT_INACTIVE
&& ns
== UNIT_DEACTIVATING
));
843 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
844 u
->meta
.active_enter_timestamp
= now(CLOCK_REALTIME
);
845 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
846 u
->meta
.active_exit_timestamp
= now(CLOCK_REALTIME
);
850 if (u
->meta
.job
->state
== JOB_WAITING
)
852 /* So we reached a different state for this
853 * job. Let's see if we can run it now if it
854 * failed previously due to EAGAIN. */
855 job_add_to_run_queue(u
->meta
.job
);
858 assert(u
->meta
.job
->state
== JOB_RUNNING
);
860 /* Let's check whether this state change
861 * constitutes a finished job, or maybe
862 * cotradicts a running job and hence needs to
863 * invalidate jobs. */
865 switch (u
->meta
.job
->type
) {
868 case JOB_VERIFY_ACTIVE
:
870 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
871 job_finish_and_invalidate(u
->meta
.job
, true);
872 else if (ns
!= UNIT_ACTIVATING
) {
874 job_finish_and_invalidate(u
->meta
.job
, false);
880 case JOB_RELOAD_OR_START
:
882 if (ns
== UNIT_ACTIVE
)
883 job_finish_and_invalidate(u
->meta
.job
, true);
884 else if (ns
!= UNIT_ACTIVATING
&& ns
!= UNIT_ACTIVE_RELOADING
) {
886 job_finish_and_invalidate(u
->meta
.job
, false);
893 case JOB_TRY_RESTART
:
895 if (ns
== UNIT_INACTIVE
)
896 job_finish_and_invalidate(u
->meta
.job
, true);
897 else if (ns
!= UNIT_DEACTIVATING
) {
899 job_finish_and_invalidate(u
->meta
.job
, false);
905 assert_not_reached("Job type unknown");
910 /* If this state change happened without being requested by a
911 * job, then let's retroactively start or stop dependencies */
914 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
915 retroactively_start_dependencies(u
);
916 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
917 retroactively_stop_dependencies(u
);
920 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
922 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
)) {
923 log_info("D-Bus became available, trying to reconnect.");
924 /* The bus just got started, hence try to connect to it. */
925 bus_init_system(u
->meta
.manager
);
926 bus_init_api(u
->meta
.manager
);
929 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
)) {
930 /* The syslog daemon just got started, hence try to connect to it. */
931 log_info("Syslog became available, trying to reconnect.");
935 } else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
937 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
))
938 /* The syslog daemon just got terminated, hence try to disconnect from it. */
941 /* We don't care about D-Bus here, since we'll get an
942 * asynchronous notification for it anyway. */
945 /* Maybe we finished startup and are now ready for being
946 * stopped because unneeded? */
947 unit_check_uneeded(u
);
949 unit_add_to_dbus_queue(u
);
952 int unit_watch_fd(Unit
*u
, int fd
, uint32_t events
, Watch
*w
) {
953 struct epoll_event ev
;
958 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_FD
&& w
->fd
== fd
&& w
->data
.unit
== u
));
964 if (epoll_ctl(u
->meta
.manager
->epoll_fd
,
965 w
->type
== WATCH_INVALID
? EPOLL_CTL_ADD
: EPOLL_CTL_MOD
,
977 void unit_unwatch_fd(Unit
*u
, Watch
*w
) {
981 if (w
->type
== WATCH_INVALID
)
984 assert(w
->type
== WATCH_FD
);
985 assert(w
->data
.unit
== u
);
986 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
989 w
->type
= WATCH_INVALID
;
993 int unit_watch_pid(Unit
*u
, pid_t pid
) {
997 return hashmap_put(u
->meta
.manager
->watch_pids
, UINT32_TO_PTR(pid
), u
);
1000 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
1004 hashmap_remove(u
->meta
.manager
->watch_pids
, UINT32_TO_PTR(pid
));
1007 int unit_watch_timer(Unit
*u
, usec_t delay
, Watch
*w
) {
1008 struct itimerspec its
;
1014 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_TIMER
&& w
->data
.unit
== u
));
1016 /* This will try to reuse the old timer if there is one */
1018 if (w
->type
== WATCH_TIMER
) {
1023 if ((fd
= timerfd_create(CLOCK_MONOTONIC
, TFD_NONBLOCK
|TFD_CLOEXEC
)) < 0)
1030 /* Set absolute time in the past, but not 0, since we
1031 * don't want to disarm the timer */
1032 its
.it_value
.tv_sec
= 0;
1033 its
.it_value
.tv_nsec
= 1;
1035 flags
= TFD_TIMER_ABSTIME
;
1037 timespec_store(&its
.it_value
, delay
);
1041 /* This will also flush the elapse counter */
1042 if (timerfd_settime(fd
, flags
, &its
, NULL
) < 0)
1045 if (w
->type
== WATCH_INVALID
) {
1046 struct epoll_event ev
;
1050 ev
.events
= EPOLLIN
;
1052 if (epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_ADD
, fd
, &ev
) < 0)
1057 w
->type
= WATCH_TIMER
;
1064 close_nointr_nofail(fd
);
1069 void unit_unwatch_timer(Unit
*u
, Watch
*w
) {
1073 if (w
->type
== WATCH_INVALID
)
1076 assert(w
->type
== WATCH_TIMER
&& w
->data
.unit
== u
);
1078 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1079 assert_se(close_nointr(w
->fd
) == 0);
1082 w
->type
= WATCH_INVALID
;
1083 w
->data
.unit
= NULL
;
1086 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
1088 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
1092 case JOB_VERIFY_ACTIVE
:
1098 case JOB_TRY_RESTART
:
1099 return unit_can_start(u
);
1102 return unit_can_reload(u
);
1104 case JOB_RELOAD_OR_START
:
1105 return unit_can_reload(u
) && unit_can_start(u
);
1108 assert_not_reached("Invalid job type");
1112 int unit_add_dependency(Unit
*u
, UnitDependency d
, Unit
*other
) {
1114 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
1115 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
1116 [UNIT_SOFT_REQUIRES
] = UNIT_SOFT_REQUIRED_BY
,
1117 [UNIT_WANTS
] = UNIT_WANTED_BY
,
1118 [UNIT_REQUISITE
] = UNIT_REQUIRED_BY
,
1119 [UNIT_SOFT_REQUISITE
] = UNIT_SOFT_REQUIRED_BY
,
1120 [UNIT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1121 [UNIT_SOFT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1122 [UNIT_WANTED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1123 [UNIT_CONFLICTS
] = UNIT_CONFLICTS
,
1124 [UNIT_BEFORE
] = UNIT_AFTER
,
1125 [UNIT_AFTER
] = UNIT_BEFORE
1130 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
1131 assert(inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
);
1134 /* We won't allow dependencies on ourselves. We will not
1135 * consider them an error however. */
1139 if ((r
= set_ensure_allocated(&u
->meta
.dependencies
[d
], trivial_hash_func
, trivial_compare_func
)) < 0)
1142 if ((r
= set_ensure_allocated(&other
->meta
.dependencies
[inverse_table
[d
]], trivial_hash_func
, trivial_compare_func
)) < 0)
1145 if ((r
= set_put(u
->meta
.dependencies
[d
], other
)) < 0)
1148 if ((r
= set_put(other
->meta
.dependencies
[inverse_table
[d
]], u
)) < 0) {
1149 set_remove(u
->meta
.dependencies
[d
], other
);
1153 unit_add_to_dbus_queue(u
);
1157 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
) {
1161 if ((r
= manager_load_unit(u
->meta
.manager
, name
, &other
)) < 0)
1164 if ((r
= unit_add_dependency(u
, d
, other
)) < 0)
1170 int unit_add_dependency_by_name_inverse(Unit
*u
, UnitDependency d
, const char *name
) {
1174 if ((r
= manager_load_unit(u
->meta
.manager
, name
, &other
)) < 0)
1177 if ((r
= unit_add_dependency(other
, d
, u
)) < 0)
1183 int set_unit_path(const char *p
) {
1187 /* This is mostly for debug purposes */
1189 if (path_is_absolute(p
)) {
1190 if (!(c
= strdup(p
)))
1193 if (!(cwd
= get_current_dir_name()))
1196 r
= asprintf(&c
, "%s/%s", cwd
, p
);
1203 if (setenv("SYSTEMD_UNIT_PATH", c
, 0) < 0) {
1212 char *unit_name_escape_path(const char *path
, const char *suffix
) {
1219 /* Takes a path and a suffix and prefix and makes a nice
1220 * string suitable as unit name of it, escaping all weird
1223 * / becomes ., and all chars not alloweed in a unit name get
1224 * escaped as \xFF, including \ and ., of course. This
1225 * escaping is hence reversible.
1234 if (!(r
= new(char, a
*4+b
+1)))
1237 for (f
= path
, t
= r
; *f
; f
++) {
1240 else if (*f
== '.' || *f
== '\\' || !strchr(VALID_CHARS
, *f
)) {
1243 *(t
++) = hexchar(*f
> 4);
1244 *(t
++) = hexchar(*f
);
1249 memcpy(t
, suffix
, b
+1);
1254 char *unit_dbus_path(Unit
*u
) {
1259 if (!(e
= bus_path_escape(unit_id(u
))))
1262 if (asprintf(&p
, "/org/freedesktop/systemd1/unit/%s", e
) < 0) {
1271 int unit_add_cgroup(Unit
*u
, CGroupBonding
*b
) {
1279 /* Ensure this hasn't been added yet */
1282 l
= hashmap_get(u
->meta
.manager
->cgroup_bondings
, b
->path
);
1283 LIST_PREPEND(CGroupBonding
, by_path
, l
, b
);
1285 if ((r
= hashmap_replace(u
->meta
.manager
->cgroup_bondings
, b
->path
, l
)) < 0) {
1286 LIST_REMOVE(CGroupBonding
, by_path
, l
, b
);
1290 LIST_PREPEND(CGroupBonding
, by_unit
, u
->meta
.cgroup_bondings
, b
);
1296 int unit_add_cgroup_from_text(Unit
*u
, const char *name
) {
1306 /* Detect controller name */
1307 n
= strcspn(name
, ":/");
1309 /* Only controller name, no path? No path? */
1321 /* Insist in absolute paths */
1325 if (!(controller
= strndup(name
, n
)))
1328 if (cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, controller
)) {
1333 if (!(b
= new0(CGroupBonding
, 1))) {
1338 b
->controller
= controller
;
1340 if (!(b
->path
= strdup(p
))) {
1346 b
->clean_up
= false;
1348 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1355 free(b
->controller
);
1361 int unit_add_default_cgroup(Unit
*u
) {
1367 /* Adds in the default cgroup data, if it wasn't specified yet */
1369 if (unit_get_default_cgroup(u
))
1372 if (!(b
= new0(CGroupBonding
, 1)))
1375 if (!(b
->controller
= strdup(u
->meta
.manager
->cgroup_controller
)))
1378 if (asprintf(&b
->path
, "%s/%s", u
->meta
.manager
->cgroup_hierarchy
, unit_id(u
)) < 0)
1384 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1391 free(b
->controller
);
1397 CGroupBonding
* unit_get_default_cgroup(Unit
*u
) {
1400 return cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, u
->meta
.manager
->cgroup_controller
);
1403 static const char* const unit_type_table
[_UNIT_TYPE_MAX
] = {
1404 [UNIT_SERVICE
] = "service",
1405 [UNIT_TIMER
] = "timer",
1406 [UNIT_SOCKET
] = "socket",
1407 [UNIT_TARGET
] = "target",
1408 [UNIT_DEVICE
] = "device",
1409 [UNIT_MOUNT
] = "mount",
1410 [UNIT_AUTOMOUNT
] = "automount",
1411 [UNIT_SNAPSHOT
] = "snapshot"
1414 DEFINE_STRING_TABLE_LOOKUP(unit_type
, UnitType
);
1416 static const char* const unit_load_state_table
[_UNIT_LOAD_STATE_MAX
] = {
1417 [UNIT_STUB
] = "stub",
1418 [UNIT_LOADED
] = "loaded",
1419 [UNIT_FAILED
] = "failed",
1420 [UNIT_MERGED
] = "merged"
1423 DEFINE_STRING_TABLE_LOOKUP(unit_load_state
, UnitLoadState
);
1425 static const char* const unit_active_state_table
[_UNIT_ACTIVE_STATE_MAX
] = {
1426 [UNIT_ACTIVE
] = "active",
1427 [UNIT_INACTIVE
] = "inactive",
1428 [UNIT_ACTIVATING
] = "activating",
1429 [UNIT_DEACTIVATING
] = "deactivating"
1432 DEFINE_STRING_TABLE_LOOKUP(unit_active_state
, UnitActiveState
);
1434 static const char* const unit_dependency_table
[_UNIT_DEPENDENCY_MAX
] = {
1435 [UNIT_REQUIRES
] = "Requires",
1436 [UNIT_SOFT_REQUIRES
] = "SoftRequires",
1437 [UNIT_WANTS
] = "Wants",
1438 [UNIT_REQUISITE
] = "Requisite",
1439 [UNIT_SOFT_REQUISITE
] = "SoftRequisite",
1440 [UNIT_REQUIRED_BY
] = "RequiredBy",
1441 [UNIT_SOFT_REQUIRED_BY
] = "SoftRequiredBy",
1442 [UNIT_WANTED_BY
] = "WantedBy",
1443 [UNIT_CONFLICTS
] = "Conflicts",
1444 [UNIT_BEFORE
] = "Before",
1445 [UNIT_AFTER
] = "After",
1448 DEFINE_STRING_TABLE_LOOKUP(unit_dependency
, UnitDependency
);
1450 static const char* const kill_mode_table
[_KILL_MODE_MAX
] = {
1451 [KILL_PROCESS
] = "process",
1452 [KILL_PROCESS_GROUP
] = "process-group",
1453 [KILL_CONTROL_GROUP
] = "control-group"
1456 DEFINE_STRING_TABLE_LOOKUP(kill_mode
, KillMode
);