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 (u
->meta
.type
!= _UNIT_TYPE_INVALID
&&
159 UNIT_VTABLE(u
)->no_alias
&&
160 !set_isempty(u
->meta
.names
))
163 if (!(s
= strdup(text
)))
166 if ((r
= set_put(u
->meta
.names
, s
)) < 0) {
175 if ((r
= hashmap_put(u
->meta
.manager
->units
, s
, u
)) < 0) {
176 set_remove(u
->meta
.names
, s
);
181 if (u
->meta
.type
== _UNIT_TYPE_INVALID
) {
182 LIST_PREPEND(Meta
, units_per_type
, u
->meta
.manager
->units_per_type
[t
], &u
->meta
);
186 if (UNIT_VTABLE(u
)->init
)
187 UNIT_VTABLE(u
)->init(u
);
193 unit_add_to_dbus_queue(u
);
197 int unit_choose_id(Unit
*u
, const char *name
) {
203 /* Selects one of the names of this unit as the id */
205 if (!(s
= set_get(u
->meta
.names
, (char*) name
)))
210 unit_add_to_dbus_queue(u
);
214 int unit_set_description(Unit
*u
, const char *description
) {
219 if (!(s
= strdup(description
)))
222 free(u
->meta
.description
);
223 u
->meta
.description
= s
;
225 unit_add_to_dbus_queue(u
);
229 void unit_add_to_load_queue(Unit
*u
) {
231 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
233 if (u
->meta
.load_state
!= UNIT_STUB
|| u
->meta
.in_load_queue
)
236 LIST_PREPEND(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
237 u
->meta
.in_load_queue
= true;
240 void unit_add_to_cleanup_queue(Unit
*u
) {
243 if (u
->meta
.in_cleanup_queue
)
246 LIST_PREPEND(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
247 u
->meta
.in_cleanup_queue
= true;
250 void unit_add_to_dbus_queue(Unit
*u
) {
252 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
254 if (u
->meta
.load_state
== UNIT_STUB
|| u
->meta
.in_dbus_queue
|| set_isempty(u
->meta
.manager
->subscribed
))
257 LIST_PREPEND(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
258 u
->meta
.in_dbus_queue
= true;
261 static void bidi_set_free(Unit
*u
, Set
*s
) {
267 /* Frees the set and makes sure we are dropped from the
268 * inverse pointers */
270 SET_FOREACH(other
, s
, i
) {
273 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
274 set_remove(other
->meta
.dependencies
[d
], u
);
280 void unit_free(Unit
*u
) {
287 bus_unit_send_removed_signal(u
);
289 /* Detach from next 'bigger' objects */
290 SET_FOREACH(t
, u
->meta
.names
, i
)
291 hashmap_remove_value(u
->meta
.manager
->units
, t
, u
);
293 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
)
294 LIST_REMOVE(Meta
, units_per_type
, u
->meta
.manager
->units_per_type
[u
->meta
.type
], &u
->meta
);
296 if (u
->meta
.in_load_queue
)
297 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
299 if (u
->meta
.in_dbus_queue
)
300 LIST_REMOVE(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
302 if (u
->meta
.in_cleanup_queue
)
303 LIST_REMOVE(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
305 /* Free data and next 'smaller' objects */
307 job_free(u
->meta
.job
);
309 if (u
->meta
.load_state
!= UNIT_STUB
)
310 if (UNIT_VTABLE(u
)->done
)
311 UNIT_VTABLE(u
)->done(u
);
313 cgroup_bonding_free_list(u
->meta
.cgroup_bondings
);
315 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
316 bidi_set_free(u
, u
->meta
.dependencies
[d
]);
318 free(u
->meta
.description
);
319 free(u
->meta
.fragment_path
);
321 while ((t
= set_steal_first(u
->meta
.names
)))
323 set_free(u
->meta
.names
);
328 UnitActiveState
unit_active_state(Unit
*u
) {
331 if (u
->meta
.load_state
!= UNIT_LOADED
)
332 return UNIT_INACTIVE
;
334 return UNIT_VTABLE(u
)->active_state(u
);
337 static void complete_move(Set
**s
, Set
**other
) {
345 set_move(*s
, *other
);
352 static void merge_names(Unit
*u
, Unit
*other
) {
359 complete_move(&u
->meta
.names
, &other
->meta
.names
);
361 while ((t
= set_steal_first(other
->meta
.names
)))
364 set_free(other
->meta
.names
);
365 other
->meta
.names
= NULL
;
366 other
->meta
.id
= NULL
;
368 SET_FOREACH(t
, u
->meta
.names
, i
)
369 assert_se(hashmap_replace(u
->meta
.manager
->units
, t
, u
) == 0);
372 static void merge_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
379 assert(d
< _UNIT_DEPENDENCY_MAX
);
381 SET_FOREACH(back
, other
->meta
.dependencies
[d
], i
) {
384 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++)
385 if ((r
= set_remove_and_put(back
->meta
.dependencies
[k
], other
, u
)) < 0) {
388 set_remove(back
->meta
.dependencies
[k
], other
);
390 assert(r
== -ENOENT
);
394 complete_move(&u
->meta
.dependencies
[d
], &other
->meta
.dependencies
[d
]);
396 set_free(other
->meta
.dependencies
[d
]);
397 other
->meta
.dependencies
[d
] = NULL
;
400 int unit_merge(Unit
*u
, Unit
*other
) {
405 assert(u
->meta
.manager
== other
->meta
.manager
);
407 other
= unit_follow_merge(other
);
412 if (u
->meta
.type
!= u
->meta
.type
)
415 if (other
->meta
.load_state
!= UNIT_STUB
&&
416 other
->meta
.load_state
!= UNIT_FAILED
)
422 if (unit_active_state(other
) != UNIT_INACTIVE
)
426 merge_names(u
, other
);
428 /* Merge dependencies */
429 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
430 merge_dependencies(u
, other
, d
);
432 other
->meta
.load_state
= UNIT_MERGED
;
433 other
->meta
.merged_into
= u
;
435 /* If there is still some data attached to the other node, we
436 * don't need it anymore, and can free it. */
437 if (other
->meta
.load_state
!= UNIT_STUB
)
438 if (UNIT_VTABLE(other
)->done
)
439 UNIT_VTABLE(other
)->done(other
);
441 unit_add_to_dbus_queue(u
);
442 unit_add_to_cleanup_queue(other
);
447 int unit_merge_by_name(Unit
*u
, const char *name
) {
453 if (!(other
= manager_get_unit(u
->meta
.manager
, name
)))
454 return unit_add_name(u
, name
);
456 return unit_merge(u
, other
);
459 Unit
* unit_follow_merge(Unit
*u
) {
462 while (u
->meta
.load_state
== UNIT_MERGED
)
463 assert_se(u
= u
->meta
.merged_into
);
468 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
474 if (c
->output
!= EXEC_OUTPUT_KERNEL
&& c
->output
!= EXEC_OUTPUT_SYSLOG
)
477 /* If syslog or kernel logging is requested, make sure our own
478 * logging daemon is run first. */
480 if ((r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_LOGGER_SOCKET
)) < 0)
483 if (u
->meta
.manager
->running_as
!= MANAGER_SESSION
)
484 if ((r
= unit_add_dependency_by_name(u
, UNIT_REQUIRES
, SPECIAL_LOGGER_SOCKET
)) < 0)
490 const char* unit_id(Unit
*u
) {
496 return set_first(u
->meta
.names
);
499 const char *unit_description(Unit
*u
) {
502 if (u
->meta
.description
)
503 return u
->meta
.description
;
508 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
515 char timestamp1
[FORMAT_TIMESTAMP_MAX
], timestamp2
[FORMAT_TIMESTAMP_MAX
];
521 p2
= strappend(prefix
, "\t");
522 prefix2
= p2
? p2
: prefix
;
526 "%s\tDescription: %s\n"
527 "%s\tUnit Load State: %s\n"
528 "%s\tUnit Active State: %s\n"
529 "%s\tActive Enter Timestamp: %s\n"
530 "%s\tActive Exit Timestamp: %s\n",
532 prefix
, unit_description(u
),
533 prefix
, unit_load_state_to_string(u
->meta
.load_state
),
534 prefix
, unit_active_state_to_string(unit_active_state(u
)),
535 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->meta
.active_enter_timestamp
)),
536 prefix
, strna(format_timestamp(timestamp2
, sizeof(timestamp2
), u
->meta
.active_exit_timestamp
)));
538 SET_FOREACH(t
, u
->meta
.names
, i
)
539 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
541 if (u
->meta
.fragment_path
)
542 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->meta
.fragment_path
);
544 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
547 SET_FOREACH(other
, u
->meta
.dependencies
[d
], i
)
548 fprintf(f
, "%s\t%s: %s\n", prefix
, unit_dependency_to_string(d
), unit_id(other
));
551 if (u
->meta
.load_state
== UNIT_LOADED
) {
553 "%s\tRecursive Stop: %s\n"
554 "%s\tStop When Unneeded: %s\n",
555 prefix
, yes_no(u
->meta
.recursive_stop
),
556 prefix
, yes_no(u
->meta
.stop_when_unneeded
));
558 LIST_FOREACH(by_unit
, b
, u
->meta
.cgroup_bondings
)
559 fprintf(f
, "%s\tControlGroup: %s:%s\n",
560 prefix
, b
->controller
, b
->path
);
562 if (UNIT_VTABLE(u
)->dump
)
563 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
565 } else if (u
->meta
.load_state
== UNIT_MERGED
)
567 "%s\tMerged into: %s\n",
568 prefix
, unit_id(u
->meta
.merged_into
));
571 job_dump(u
->meta
.job
, f
, prefix2
);
576 /* Common implementation for multiple backends */
577 int unit_load_fragment_and_dropin(Unit
*u
) {
582 /* Load a .service file */
583 if ((r
= unit_load_fragment(u
)) < 0)
586 if (u
->meta
.load_state
== UNIT_STUB
)
589 /* Load drop-in directory data */
590 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
596 /* Common implementation for multiple backends */
597 int unit_load_fragment_and_dropin_optional(Unit
*u
) {
602 /* Same as unit_load_fragment_and_dropin(), but whether
603 * something can be loaded or not doesn't matter. */
605 /* Load a .service file */
606 if ((r
= unit_load_fragment(u
)) < 0)
609 if (u
->meta
.load_state
== UNIT_STUB
)
610 u
->meta
.load_state
= UNIT_LOADED
;
612 /* Load drop-in directory data */
613 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
619 int unit_load(Unit
*u
) {
624 if (u
->meta
.in_load_queue
) {
625 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
626 u
->meta
.in_load_queue
= false;
629 if (u
->meta
.type
== _UNIT_TYPE_INVALID
)
632 if (u
->meta
.load_state
!= UNIT_STUB
)
635 if (UNIT_VTABLE(u
)->load
)
636 if ((r
= UNIT_VTABLE(u
)->load(u
)) < 0)
639 if (u
->meta
.load_state
== UNIT_STUB
) {
644 assert((u
->meta
.load_state
!= UNIT_MERGED
) == !u
->meta
.merged_into
);
646 unit_add_to_dbus_queue(unit_follow_merge(u
));
651 u
->meta
.load_state
= UNIT_FAILED
;
652 unit_add_to_dbus_queue(u
);
654 log_error("Failed to load configuration for %s: %s", unit_id(u
), strerror(-r
));
660 * -EBADR: This unit type does not support starting.
661 * -EALREADY: Unit is already started.
662 * -EAGAIN: An operation is already in progress. Retry later.
664 int unit_start(Unit
*u
) {
665 UnitActiveState state
;
669 /* If this is already (being) started, then this will
670 * succeed. Note that this will even succeed if this unit is
671 * not startable by the user. This is relied on to detect when
672 * we need to wait for units and when waiting is finished. */
673 state
= unit_active_state(u
);
674 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
677 /* If it is stopped, but we cannot start it, then fail */
678 if (!UNIT_VTABLE(u
)->start
)
681 /* We don't suppress calls to ->start() here when we are
682 * already starting, to allow this request to be used as a
683 * "hurry up" call, for example when the unit is in some "auto
684 * restart" state where it waits for a holdoff timer to elapse
685 * before it will start again. */
687 unit_add_to_dbus_queue(u
);
688 return UNIT_VTABLE(u
)->start(u
);
691 bool unit_can_start(Unit
*u
) {
694 return !!UNIT_VTABLE(u
)->start
;
698 * -EBADR: This unit type does not support stopping.
699 * -EALREADY: Unit is already stopped.
700 * -EAGAIN: An operation is already in progress. Retry later.
702 int unit_stop(Unit
*u
) {
703 UnitActiveState state
;
707 state
= unit_active_state(u
);
708 if (state
== UNIT_INACTIVE
)
711 if (!UNIT_VTABLE(u
)->stop
)
714 unit_add_to_dbus_queue(u
);
715 return UNIT_VTABLE(u
)->stop(u
);
719 * -EBADR: This unit type does not support reloading.
720 * -ENOEXEC: Unit is not started.
721 * -EAGAIN: An operation is already in progress. Retry later.
723 int unit_reload(Unit
*u
) {
724 UnitActiveState state
;
728 if (!unit_can_reload(u
))
731 state
= unit_active_state(u
);
732 if (unit_active_state(u
) == UNIT_ACTIVE_RELOADING
)
735 if (unit_active_state(u
) != UNIT_ACTIVE
)
738 unit_add_to_dbus_queue(u
);
739 return UNIT_VTABLE(u
)->reload(u
);
742 bool unit_can_reload(Unit
*u
) {
745 if (!UNIT_VTABLE(u
)->reload
)
748 if (!UNIT_VTABLE(u
)->can_reload
)
751 return UNIT_VTABLE(u
)->can_reload(u
);
754 static void unit_check_uneeded(Unit
*u
) {
760 /* If this service shall be shut down when unneeded then do
763 if (!u
->meta
.stop_when_unneeded
)
766 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
769 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
770 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
773 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUIRED_BY
], i
)
774 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
777 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTED_BY
], i
)
778 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
781 log_debug("Service %s is not needed anymore. Stopping.", unit_id(u
));
783 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
784 manager_add_job(u
->meta
.manager
, JOB_STOP
, u
, JOB_FAIL
, true, NULL
);
787 static void retroactively_start_dependencies(Unit
*u
) {
792 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
794 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
795 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
796 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
798 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUIRES
], i
)
799 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
800 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
802 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
803 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
804 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
806 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
807 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
808 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
810 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
811 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
812 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
815 static void retroactively_stop_dependencies(Unit
*u
) {
820 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
822 if (u
->meta
.recursive_stop
) {
823 /* Pull down units need us recursively if enabled */
824 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
825 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
826 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
829 /* Garbage collect services that might not be needed anymore, if enabled */
830 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
831 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
832 unit_check_uneeded(other
);
833 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUIRES
], i
)
834 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
835 unit_check_uneeded(other
);
836 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
837 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
838 unit_check_uneeded(other
);
839 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
840 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
841 unit_check_uneeded(other
);
842 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUISITE
], i
)
843 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
844 unit_check_uneeded(other
);
847 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
) {
848 bool unexpected
= false;
851 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
852 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
853 assert(!(os
== UNIT_ACTIVE
&& ns
== UNIT_ACTIVATING
));
854 assert(!(os
== UNIT_INACTIVE
&& ns
== UNIT_DEACTIVATING
));
856 /* Note that this is called for all low-level state changes,
857 * even if they might map to the same high-level
858 * UnitActiveState! That means that ns == os is OK an expected
859 * behaviour here. For example: if a mount point is remounted
860 * this function will be called too and the utmp code below
863 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
864 u
->meta
.active_enter_timestamp
= now(CLOCK_REALTIME
);
865 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
866 u
->meta
.active_exit_timestamp
= now(CLOCK_REALTIME
);
870 if (u
->meta
.job
->state
== JOB_WAITING
)
872 /* So we reached a different state for this
873 * job. Let's see if we can run it now if it
874 * failed previously due to EAGAIN. */
875 job_add_to_run_queue(u
->meta
.job
);
878 assert(u
->meta
.job
->state
== JOB_RUNNING
);
880 /* Let's check whether this state change
881 * constitutes a finished job, or maybe
882 * cotradicts a running job and hence needs to
883 * invalidate jobs. */
885 switch (u
->meta
.job
->type
) {
888 case JOB_VERIFY_ACTIVE
:
890 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
891 job_finish_and_invalidate(u
->meta
.job
, true);
892 else if (ns
!= UNIT_ACTIVATING
) {
894 job_finish_and_invalidate(u
->meta
.job
, false);
900 case JOB_RELOAD_OR_START
:
902 if (ns
== UNIT_ACTIVE
)
903 job_finish_and_invalidate(u
->meta
.job
, true);
904 else if (ns
!= UNIT_ACTIVATING
&& ns
!= UNIT_ACTIVE_RELOADING
) {
906 job_finish_and_invalidate(u
->meta
.job
, false);
913 case JOB_TRY_RESTART
:
915 if (ns
== UNIT_INACTIVE
)
916 job_finish_and_invalidate(u
->meta
.job
, true);
917 else if (ns
!= UNIT_DEACTIVATING
) {
919 job_finish_and_invalidate(u
->meta
.job
, false);
925 assert_not_reached("Job type unknown");
930 /* If this state change happened without being requested by a
931 * job, then let's retroactively start or stop dependencies */
934 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
935 retroactively_start_dependencies(u
);
936 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
937 retroactively_stop_dependencies(u
);
940 /* Some names are special */
941 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
942 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
)) {
943 /* The bus just might have become available,
944 * hence try to connect to it, if we aren't
946 bus_init_system(u
->meta
.manager
);
947 bus_init_api(u
->meta
.manager
);
950 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
))
951 /* The syslog daemon just might have become
952 * available, hence try to connect to it, if
953 * we aren't yet connected. */
956 if (u
->meta
.type
== UNIT_MOUNT
)
957 /* Another directory became available, let's
958 * check if that is enough to write our utmp
960 manager_write_utmp_reboot(u
->meta
.manager
);
962 if (u
->meta
.type
== UNIT_TARGET
)
963 /* A target got activated, maybe this is a runlevel? */
964 manager_write_utmp_runlevel(u
->meta
.manager
, u
);
966 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
968 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
))
969 /* The syslog daemon might just have
970 * terminated, hence try to disconnect from
974 /* We don't care about D-Bus here, since we'll get an
975 * asynchronous notification for it anyway. */
978 /* Maybe we finished startup and are now ready for being
979 * stopped because unneeded? */
980 unit_check_uneeded(u
);
982 unit_add_to_dbus_queue(u
);
985 int unit_watch_fd(Unit
*u
, int fd
, uint32_t events
, Watch
*w
) {
986 struct epoll_event ev
;
991 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_FD
&& w
->fd
== fd
&& w
->data
.unit
== u
));
997 if (epoll_ctl(u
->meta
.manager
->epoll_fd
,
998 w
->type
== WATCH_INVALID
? EPOLL_CTL_ADD
: EPOLL_CTL_MOD
,
1010 void unit_unwatch_fd(Unit
*u
, Watch
*w
) {
1014 if (w
->type
== WATCH_INVALID
)
1017 assert(w
->type
== WATCH_FD
);
1018 assert(w
->data
.unit
== u
);
1019 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1022 w
->type
= WATCH_INVALID
;
1023 w
->data
.unit
= NULL
;
1026 int unit_watch_pid(Unit
*u
, pid_t pid
) {
1030 return hashmap_put(u
->meta
.manager
->watch_pids
, UINT32_TO_PTR(pid
), u
);
1033 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
1037 hashmap_remove(u
->meta
.manager
->watch_pids
, UINT32_TO_PTR(pid
));
1040 int unit_watch_timer(Unit
*u
, usec_t delay
, Watch
*w
) {
1041 struct itimerspec its
;
1047 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_TIMER
&& w
->data
.unit
== u
));
1049 /* This will try to reuse the old timer if there is one */
1051 if (w
->type
== WATCH_TIMER
) {
1056 if ((fd
= timerfd_create(CLOCK_MONOTONIC
, TFD_NONBLOCK
|TFD_CLOEXEC
)) < 0)
1063 /* Set absolute time in the past, but not 0, since we
1064 * don't want to disarm the timer */
1065 its
.it_value
.tv_sec
= 0;
1066 its
.it_value
.tv_nsec
= 1;
1068 flags
= TFD_TIMER_ABSTIME
;
1070 timespec_store(&its
.it_value
, delay
);
1074 /* This will also flush the elapse counter */
1075 if (timerfd_settime(fd
, flags
, &its
, NULL
) < 0)
1078 if (w
->type
== WATCH_INVALID
) {
1079 struct epoll_event ev
;
1083 ev
.events
= EPOLLIN
;
1085 if (epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_ADD
, fd
, &ev
) < 0)
1090 w
->type
= WATCH_TIMER
;
1097 close_nointr_nofail(fd
);
1102 void unit_unwatch_timer(Unit
*u
, Watch
*w
) {
1106 if (w
->type
== WATCH_INVALID
)
1109 assert(w
->type
== WATCH_TIMER
&& w
->data
.unit
== u
);
1111 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1112 assert_se(close_nointr(w
->fd
) == 0);
1115 w
->type
= WATCH_INVALID
;
1116 w
->data
.unit
= NULL
;
1119 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
1121 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
1125 case JOB_VERIFY_ACTIVE
:
1131 case JOB_TRY_RESTART
:
1132 return unit_can_start(u
);
1135 return unit_can_reload(u
);
1137 case JOB_RELOAD_OR_START
:
1138 return unit_can_reload(u
) && unit_can_start(u
);
1141 assert_not_reached("Invalid job type");
1145 int unit_add_dependency(Unit
*u
, UnitDependency d
, Unit
*other
) {
1147 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
1148 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
1149 [UNIT_SOFT_REQUIRES
] = UNIT_SOFT_REQUIRED_BY
,
1150 [UNIT_WANTS
] = UNIT_WANTED_BY
,
1151 [UNIT_REQUISITE
] = UNIT_REQUIRED_BY
,
1152 [UNIT_SOFT_REQUISITE
] = UNIT_SOFT_REQUIRED_BY
,
1153 [UNIT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1154 [UNIT_SOFT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1155 [UNIT_WANTED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1156 [UNIT_CONFLICTS
] = UNIT_CONFLICTS
,
1157 [UNIT_BEFORE
] = UNIT_AFTER
,
1158 [UNIT_AFTER
] = UNIT_BEFORE
1163 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
1164 assert(inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
);
1167 /* We won't allow dependencies on ourselves. We will not
1168 * consider them an error however. */
1172 if ((r
= set_ensure_allocated(&u
->meta
.dependencies
[d
], trivial_hash_func
, trivial_compare_func
)) < 0)
1175 if ((r
= set_ensure_allocated(&other
->meta
.dependencies
[inverse_table
[d
]], trivial_hash_func
, trivial_compare_func
)) < 0)
1178 if ((r
= set_put(u
->meta
.dependencies
[d
], other
)) < 0)
1181 if ((r
= set_put(other
->meta
.dependencies
[inverse_table
[d
]], u
)) < 0) {
1182 set_remove(u
->meta
.dependencies
[d
], other
);
1186 unit_add_to_dbus_queue(u
);
1190 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
) {
1194 if ((r
= manager_load_unit(u
->meta
.manager
, name
, &other
)) < 0)
1197 if ((r
= unit_add_dependency(u
, d
, other
)) < 0)
1203 int unit_add_dependency_by_name_inverse(Unit
*u
, UnitDependency d
, const char *name
) {
1207 if ((r
= manager_load_unit(u
->meta
.manager
, name
, &other
)) < 0)
1210 if ((r
= unit_add_dependency(other
, d
, u
)) < 0)
1216 int set_unit_path(const char *p
) {
1220 /* This is mostly for debug purposes */
1222 if (path_is_absolute(p
)) {
1223 if (!(c
= strdup(p
)))
1226 if (!(cwd
= get_current_dir_name()))
1229 r
= asprintf(&c
, "%s/%s", cwd
, p
);
1236 if (setenv("SYSTEMD_UNIT_PATH", c
, 0) < 0) {
1245 char *unit_name_escape_path(const char *path
, const char *suffix
) {
1252 /* Takes a path and a suffix and prefix and makes a nice
1253 * string suitable as unit name of it, escaping all weird
1256 * / becomes ., and all chars not alloweed in a unit name get
1257 * escaped as \xFF, including \ and ., of course. This
1258 * escaping is hence reversible.
1267 if (!(r
= new(char, a
*4+b
+1)))
1270 for (f
= path
, t
= r
; *f
; f
++) {
1273 else if (*f
== '.' || *f
== '\\' || !strchr(VALID_CHARS
, *f
)) {
1276 *(t
++) = hexchar(*f
> 4);
1277 *(t
++) = hexchar(*f
);
1282 memcpy(t
, suffix
, b
+1);
1287 char *unit_dbus_path(Unit
*u
) {
1292 if (!(e
= bus_path_escape(unit_id(u
))))
1295 if (asprintf(&p
, "/org/freedesktop/systemd1/unit/%s", e
) < 0) {
1304 int unit_add_cgroup(Unit
*u
, CGroupBonding
*b
) {
1312 /* Ensure this hasn't been added yet */
1315 l
= hashmap_get(u
->meta
.manager
->cgroup_bondings
, b
->path
);
1316 LIST_PREPEND(CGroupBonding
, by_path
, l
, b
);
1318 if ((r
= hashmap_replace(u
->meta
.manager
->cgroup_bondings
, b
->path
, l
)) < 0) {
1319 LIST_REMOVE(CGroupBonding
, by_path
, l
, b
);
1323 LIST_PREPEND(CGroupBonding
, by_unit
, u
->meta
.cgroup_bondings
, b
);
1329 static char *default_cgroup_path(Unit
*u
) {
1334 if (asprintf(&p
, "%s/%s", u
->meta
.manager
->cgroup_hierarchy
, unit_id(u
)) < 0)
1340 int unit_add_cgroup_from_text(Unit
*u
, const char *name
) {
1342 char *controller
= NULL
, *path
= NULL
;
1343 CGroupBonding
*b
= NULL
;
1349 /* Detect controller name */
1350 n
= strcspn(name
, ":");
1353 (name
[n
] == ':' && name
[n
+1] == 0)) {
1355 /* Only controller name, no path? */
1357 if (!(path
= default_cgroup_path(u
)))
1363 /* Controller name, and path. */
1366 if (!path_is_absolute(p
))
1369 if (!(path
= strdup(p
)))
1374 controller
= strndup(name
, n
);
1376 controller
= strdup(u
->meta
.manager
->cgroup_controller
);
1383 if (cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, controller
)) {
1388 if (!(b
= new0(CGroupBonding
, 1))) {
1393 b
->controller
= controller
;
1396 b
->clean_up
= false;
1398 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1411 int unit_add_default_cgroup(Unit
*u
) {
1417 /* Adds in the default cgroup data, if it wasn't specified yet */
1419 if (unit_get_default_cgroup(u
))
1422 if (!(b
= new0(CGroupBonding
, 1)))
1425 if (!(b
->controller
= strdup(u
->meta
.manager
->cgroup_controller
)))
1428 if (!(b
->path
= default_cgroup_path(u
)))
1434 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1441 free(b
->controller
);
1447 CGroupBonding
* unit_get_default_cgroup(Unit
*u
) {
1450 return cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, u
->meta
.manager
->cgroup_controller
);
1453 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
1461 if (!(t
= unit_name_change_suffix(unit_id(u
), type
)))
1464 assert(!unit_has_name(u
, t
));
1466 r
= manager_load_unit(u
->meta
.manager
, t
, _found
);
1470 assert(*_found
!= u
);
1475 static const char* const unit_type_table
[_UNIT_TYPE_MAX
] = {
1476 [UNIT_SERVICE
] = "service",
1477 [UNIT_TIMER
] = "timer",
1478 [UNIT_SOCKET
] = "socket",
1479 [UNIT_TARGET
] = "target",
1480 [UNIT_DEVICE
] = "device",
1481 [UNIT_MOUNT
] = "mount",
1482 [UNIT_AUTOMOUNT
] = "automount",
1483 [UNIT_SNAPSHOT
] = "snapshot"
1486 DEFINE_STRING_TABLE_LOOKUP(unit_type
, UnitType
);
1488 static const char* const unit_load_state_table
[_UNIT_LOAD_STATE_MAX
] = {
1489 [UNIT_STUB
] = "stub",
1490 [UNIT_LOADED
] = "loaded",
1491 [UNIT_FAILED
] = "failed",
1492 [UNIT_MERGED
] = "merged"
1495 DEFINE_STRING_TABLE_LOOKUP(unit_load_state
, UnitLoadState
);
1497 static const char* const unit_active_state_table
[_UNIT_ACTIVE_STATE_MAX
] = {
1498 [UNIT_ACTIVE
] = "active",
1499 [UNIT_INACTIVE
] = "inactive",
1500 [UNIT_ACTIVATING
] = "activating",
1501 [UNIT_DEACTIVATING
] = "deactivating"
1504 DEFINE_STRING_TABLE_LOOKUP(unit_active_state
, UnitActiveState
);
1506 static const char* const unit_dependency_table
[_UNIT_DEPENDENCY_MAX
] = {
1507 [UNIT_REQUIRES
] = "Requires",
1508 [UNIT_SOFT_REQUIRES
] = "SoftRequires",
1509 [UNIT_WANTS
] = "Wants",
1510 [UNIT_REQUISITE
] = "Requisite",
1511 [UNIT_SOFT_REQUISITE
] = "SoftRequisite",
1512 [UNIT_REQUIRED_BY
] = "RequiredBy",
1513 [UNIT_SOFT_REQUIRED_BY
] = "SoftRequiredBy",
1514 [UNIT_WANTED_BY
] = "WantedBy",
1515 [UNIT_CONFLICTS
] = "Conflicts",
1516 [UNIT_BEFORE
] = "Before",
1517 [UNIT_AFTER
] = "After",
1520 DEFINE_STRING_TABLE_LOOKUP(unit_dependency
, UnitDependency
);
1522 static const char* const kill_mode_table
[_KILL_MODE_MAX
] = {
1523 [KILL_PROCESS
] = "process",
1524 [KILL_PROCESS_GROUP
] = "process-group",
1525 [KILL_CONTROL_GROUP
] = "control-group"
1528 DEFINE_STRING_TABLE_LOOKUP(kill_mode
, KillMode
);