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"
38 #include "unit-name.h"
39 #include "specifier.h"
40 #include "dbus-unit.h"
42 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
43 [UNIT_SERVICE
] = &service_vtable
,
44 [UNIT_TIMER
] = &timer_vtable
,
45 [UNIT_SOCKET
] = &socket_vtable
,
46 [UNIT_TARGET
] = &target_vtable
,
47 [UNIT_DEVICE
] = &device_vtable
,
48 [UNIT_MOUNT
] = &mount_vtable
,
49 [UNIT_AUTOMOUNT
] = &automount_vtable
,
50 [UNIT_SNAPSHOT
] = &snapshot_vtable
53 Unit
*unit_new(Manager
*m
) {
58 if (!(u
= new0(Unit
, 1)))
61 if (!(u
->meta
.names
= set_new(string_hash_func
, string_compare_func
))) {
67 u
->meta
.type
= _UNIT_TYPE_INVALID
;
72 bool unit_has_name(Unit
*u
, const char *name
) {
76 return !!set_get(u
->meta
.names
, (char*) name
);
79 int unit_add_name(Unit
*u
, const char *text
) {
81 char *s
= NULL
, *i
= NULL
;
87 if (unit_name_is_template(text
)) {
88 if (!u
->meta
.instance
)
91 s
= unit_name_replace_instance(text
, u
->meta
.instance
);
98 if (!unit_name_is_valid(s
)) {
103 assert_se((t
= unit_name_to_type(s
)) >= 0);
105 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
&& t
!= u
->meta
.type
) {
110 if ((r
= unit_name_to_instance(s
, &i
)) < 0)
113 if (i
&& unit_vtable
[t
]->no_instances
)
116 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
&& !streq_ptr(u
->meta
.instance
, i
)) {
121 if (unit_vtable
[t
]->no_alias
&&
122 !set_isempty(u
->meta
.names
) &&
123 !set_get(u
->meta
.names
, s
)) {
128 if ((r
= set_put(u
->meta
.names
, s
)) < 0) {
134 if ((r
= hashmap_put(u
->meta
.manager
->units
, s
, u
)) < 0) {
135 set_remove(u
->meta
.names
, s
);
139 if (u
->meta
.type
== _UNIT_TYPE_INVALID
) {
143 u
->meta
.instance
= i
;
145 LIST_PREPEND(Meta
, units_per_type
, u
->meta
.manager
->units_per_type
[t
], &u
->meta
);
147 if (UNIT_VTABLE(u
)->init
)
148 UNIT_VTABLE(u
)->init(u
);
152 unit_add_to_dbus_queue(u
);
162 int unit_choose_id(Unit
*u
, const char *name
) {
168 if (unit_name_is_template(name
)) {
170 if (!u
->meta
.instance
)
173 if (!(t
= unit_name_replace_instance(name
, u
->meta
.instance
)))
179 /* Selects one of the names of this unit as the id */
180 s
= set_get(u
->meta
.names
, (char*) name
);
187 unit_add_to_dbus_queue(u
);
192 int unit_set_description(Unit
*u
, const char *description
) {
197 if (!(s
= strdup(description
)))
200 free(u
->meta
.description
);
201 u
->meta
.description
= s
;
203 unit_add_to_dbus_queue(u
);
207 void unit_add_to_load_queue(Unit
*u
) {
209 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
211 if (u
->meta
.load_state
!= UNIT_STUB
|| u
->meta
.in_load_queue
)
214 LIST_PREPEND(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
215 u
->meta
.in_load_queue
= true;
218 void unit_add_to_cleanup_queue(Unit
*u
) {
221 if (u
->meta
.in_cleanup_queue
)
224 LIST_PREPEND(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
225 u
->meta
.in_cleanup_queue
= true;
228 void unit_add_to_dbus_queue(Unit
*u
) {
230 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
232 if (u
->meta
.load_state
== UNIT_STUB
|| u
->meta
.in_dbus_queue
|| set_isempty(u
->meta
.manager
->subscribed
))
235 LIST_PREPEND(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
236 u
->meta
.in_dbus_queue
= true;
239 static void bidi_set_free(Unit
*u
, Set
*s
) {
245 /* Frees the set and makes sure we are dropped from the
246 * inverse pointers */
248 SET_FOREACH(other
, s
, i
) {
251 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
252 set_remove(other
->meta
.dependencies
[d
], u
);
258 void unit_free(Unit
*u
) {
265 bus_unit_send_removed_signal(u
);
267 /* Detach from next 'bigger' objects */
268 SET_FOREACH(t
, u
->meta
.names
, i
)
269 hashmap_remove_value(u
->meta
.manager
->units
, t
, u
);
271 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
)
272 LIST_REMOVE(Meta
, units_per_type
, u
->meta
.manager
->units_per_type
[u
->meta
.type
], &u
->meta
);
274 if (u
->meta
.in_load_queue
)
275 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
277 if (u
->meta
.in_dbus_queue
)
278 LIST_REMOVE(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
280 if (u
->meta
.in_cleanup_queue
)
281 LIST_REMOVE(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
283 /* Free data and next 'smaller' objects */
285 job_free(u
->meta
.job
);
287 if (u
->meta
.load_state
!= UNIT_STUB
)
288 if (UNIT_VTABLE(u
)->done
)
289 UNIT_VTABLE(u
)->done(u
);
291 cgroup_bonding_free_list(u
->meta
.cgroup_bondings
);
293 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
294 bidi_set_free(u
, u
->meta
.dependencies
[d
]);
296 free(u
->meta
.description
);
297 free(u
->meta
.fragment_path
);
299 while ((t
= set_steal_first(u
->meta
.names
)))
301 set_free(u
->meta
.names
);
303 free(u
->meta
.instance
);
308 UnitActiveState
unit_active_state(Unit
*u
) {
311 if (u
->meta
.load_state
!= UNIT_LOADED
)
312 return UNIT_INACTIVE
;
314 return UNIT_VTABLE(u
)->active_state(u
);
317 const char* unit_sub_state_to_string(Unit
*u
) {
320 return UNIT_VTABLE(u
)->sub_state_to_string(u
);
323 static void complete_move(Set
**s
, Set
**other
) {
331 set_move(*s
, *other
);
338 static void merge_names(Unit
*u
, Unit
*other
) {
345 complete_move(&u
->meta
.names
, &other
->meta
.names
);
347 while ((t
= set_steal_first(other
->meta
.names
)))
350 set_free(other
->meta
.names
);
351 other
->meta
.names
= NULL
;
352 other
->meta
.id
= NULL
;
354 SET_FOREACH(t
, u
->meta
.names
, i
)
355 assert_se(hashmap_replace(u
->meta
.manager
->units
, t
, u
) == 0);
358 static void merge_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
365 assert(d
< _UNIT_DEPENDENCY_MAX
);
367 SET_FOREACH(back
, other
->meta
.dependencies
[d
], i
) {
370 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++)
371 if ((r
= set_remove_and_put(back
->meta
.dependencies
[k
], other
, u
)) < 0) {
374 set_remove(back
->meta
.dependencies
[k
], other
);
376 assert(r
== -ENOENT
);
380 complete_move(&u
->meta
.dependencies
[d
], &other
->meta
.dependencies
[d
]);
382 set_free(other
->meta
.dependencies
[d
]);
383 other
->meta
.dependencies
[d
] = NULL
;
386 int unit_merge(Unit
*u
, Unit
*other
) {
391 assert(u
->meta
.manager
== other
->meta
.manager
);
392 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
394 other
= unit_follow_merge(other
);
399 if (u
->meta
.type
!= other
->meta
.type
)
402 if (!streq_ptr(u
->meta
.instance
, other
->meta
.instance
))
405 if (other
->meta
.load_state
!= UNIT_STUB
&&
406 other
->meta
.load_state
!= UNIT_FAILED
)
412 if (unit_active_state(other
) != UNIT_INACTIVE
)
416 merge_names(u
, other
);
418 /* Merge dependencies */
419 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
420 merge_dependencies(u
, other
, d
);
422 other
->meta
.load_state
= UNIT_MERGED
;
423 other
->meta
.merged_into
= u
;
425 /* If there is still some data attached to the other node, we
426 * don't need it anymore, and can free it. */
427 if (other
->meta
.load_state
!= UNIT_STUB
)
428 if (UNIT_VTABLE(other
)->done
)
429 UNIT_VTABLE(other
)->done(other
);
431 unit_add_to_dbus_queue(u
);
432 unit_add_to_cleanup_queue(other
);
437 int unit_merge_by_name(Unit
*u
, const char *name
) {
445 if (unit_name_is_template(name
)) {
446 if (!u
->meta
.instance
)
449 if (!(s
= unit_name_replace_instance(name
, u
->meta
.instance
)))
455 if (!(other
= manager_get_unit(u
->meta
.manager
, name
)))
456 r
= unit_add_name(u
, name
);
458 r
= unit_merge(u
, other
);
464 Unit
* unit_follow_merge(Unit
*u
) {
467 while (u
->meta
.load_state
== UNIT_MERGED
)
468 assert_se(u
= u
->meta
.merged_into
);
473 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
479 if (c
->std_output
!= EXEC_OUTPUT_KERNEL
&& c
->std_output
!= EXEC_OUTPUT_SYSLOG
)
482 /* If syslog or kernel logging is requested, make sure our own
483 * logging daemon is run first. */
485 if ((r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_LOGGER_SOCKET
, NULL
)) < 0)
488 if (u
->meta
.manager
->running_as
!= MANAGER_SESSION
)
489 if ((r
= unit_add_dependency_by_name(u
, UNIT_REQUIRES
, SPECIAL_LOGGER_SOCKET
, NULL
)) < 0)
495 const char *unit_description(Unit
*u
) {
498 if (u
->meta
.description
)
499 return u
->meta
.description
;
504 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
511 char timestamp1
[FORMAT_TIMESTAMP_MAX
], timestamp2
[FORMAT_TIMESTAMP_MAX
];
514 assert(u
->meta
.type
>= 0);
518 p2
= strappend(prefix
, "\t");
519 prefix2
= p2
? p2
: prefix
;
523 "%s\tDescription: %s\n"
525 "%s\tUnit Load State: %s\n"
526 "%s\tUnit Active State: %s\n"
527 "%s\tActive Enter Timestamp: %s\n"
528 "%s\tActive Exit Timestamp: %s\n",
530 prefix
, unit_description(u
),
531 prefix
, strna(u
->meta
.instance
),
532 prefix
, unit_load_state_to_string(u
->meta
.load_state
),
533 prefix
, unit_active_state_to_string(unit_active_state(u
)),
534 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->meta
.active_enter_timestamp
)),
535 prefix
, strna(format_timestamp(timestamp2
, sizeof(timestamp2
), u
->meta
.active_exit_timestamp
)));
537 SET_FOREACH(t
, u
->meta
.names
, i
)
538 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
540 if (u
->meta
.fragment_path
)
541 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->meta
.fragment_path
);
543 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
546 SET_FOREACH(other
, u
->meta
.dependencies
[d
], i
)
547 fprintf(f
, "%s\t%s: %s\n", prefix
, unit_dependency_to_string(d
), other
->meta
.id
);
550 if (u
->meta
.load_state
== UNIT_LOADED
) {
552 "%s\tRecursive Stop: %s\n"
553 "%s\tStop When Unneeded: %s\n",
554 prefix
, yes_no(u
->meta
.recursive_stop
),
555 prefix
, yes_no(u
->meta
.stop_when_unneeded
));
557 LIST_FOREACH(by_unit
, b
, u
->meta
.cgroup_bondings
)
558 fprintf(f
, "%s\tControlGroup: %s:%s\n",
559 prefix
, b
->controller
, b
->path
);
561 if (UNIT_VTABLE(u
)->dump
)
562 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
564 } else if (u
->meta
.load_state
== UNIT_MERGED
)
566 "%s\tMerged into: %s\n",
567 prefix
, u
->meta
.merged_into
->meta
.id
);
570 job_dump(u
->meta
.job
, f
, prefix2
);
575 /* Common implementation for multiple backends */
576 int unit_load_fragment_and_dropin(Unit
*u
) {
581 /* Load a .service file */
582 if ((r
= unit_load_fragment(u
)) < 0)
585 if (u
->meta
.load_state
== UNIT_STUB
)
588 /* Load drop-in directory data */
589 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
595 /* Common implementation for multiple backends */
596 int unit_load_fragment_and_dropin_optional(Unit
*u
) {
601 /* Same as unit_load_fragment_and_dropin(), but whether
602 * something can be loaded or not doesn't matter. */
604 /* Load a .service file */
605 if ((r
= unit_load_fragment(u
)) < 0)
608 if (u
->meta
.load_state
== UNIT_STUB
)
609 u
->meta
.load_state
= UNIT_LOADED
;
611 /* Load drop-in directory data */
612 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
618 int unit_load(Unit
*u
) {
623 if (u
->meta
.in_load_queue
) {
624 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
625 u
->meta
.in_load_queue
= false;
628 if (u
->meta
.type
== _UNIT_TYPE_INVALID
)
631 if (u
->meta
.load_state
!= UNIT_STUB
)
634 if (UNIT_VTABLE(u
)->load
)
635 if ((r
= UNIT_VTABLE(u
)->load(u
)) < 0)
638 if (u
->meta
.load_state
== UNIT_STUB
) {
643 assert((u
->meta
.load_state
!= UNIT_MERGED
) == !u
->meta
.merged_into
);
645 unit_add_to_dbus_queue(unit_follow_merge(u
));
650 u
->meta
.load_state
= UNIT_FAILED
;
651 unit_add_to_dbus_queue(u
);
653 log_error("Failed to load configuration for %s: %s", u
->meta
.id
, strerror(-r
));
659 * -EBADR: This unit type does not support starting.
660 * -EALREADY: Unit is already started.
661 * -EAGAIN: An operation is already in progress. Retry later.
663 int unit_start(Unit
*u
) {
664 UnitActiveState state
;
668 /* If this is already (being) started, then this will
669 * succeed. Note that this will even succeed if this unit is
670 * not startable by the user. This is relied on to detect when
671 * we need to wait for units and when waiting is finished. */
672 state
= unit_active_state(u
);
673 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
676 /* If it is stopped, but we cannot start it, then fail */
677 if (!UNIT_VTABLE(u
)->start
)
680 /* We don't suppress calls to ->start() here when we are
681 * already starting, to allow this request to be used as a
682 * "hurry up" call, for example when the unit is in some "auto
683 * restart" state where it waits for a holdoff timer to elapse
684 * before it will start again. */
686 unit_add_to_dbus_queue(u
);
687 return UNIT_VTABLE(u
)->start(u
);
690 bool unit_can_start(Unit
*u
) {
693 return !!UNIT_VTABLE(u
)->start
;
697 * -EBADR: This unit type does not support stopping.
698 * -EALREADY: Unit is already stopped.
699 * -EAGAIN: An operation is already in progress. Retry later.
701 int unit_stop(Unit
*u
) {
702 UnitActiveState state
;
706 state
= unit_active_state(u
);
707 if (state
== UNIT_INACTIVE
)
710 if (!UNIT_VTABLE(u
)->stop
)
713 unit_add_to_dbus_queue(u
);
714 return UNIT_VTABLE(u
)->stop(u
);
718 * -EBADR: This unit type does not support reloading.
719 * -ENOEXEC: Unit is not started.
720 * -EAGAIN: An operation is already in progress. Retry later.
722 int unit_reload(Unit
*u
) {
723 UnitActiveState state
;
727 if (!unit_can_reload(u
))
730 state
= unit_active_state(u
);
731 if (unit_active_state(u
) == UNIT_ACTIVE_RELOADING
)
734 if (unit_active_state(u
) != UNIT_ACTIVE
)
737 unit_add_to_dbus_queue(u
);
738 return UNIT_VTABLE(u
)->reload(u
);
741 bool unit_can_reload(Unit
*u
) {
744 if (!UNIT_VTABLE(u
)->reload
)
747 if (!UNIT_VTABLE(u
)->can_reload
)
750 return UNIT_VTABLE(u
)->can_reload(u
);
753 static void unit_check_uneeded(Unit
*u
) {
759 /* If this service shall be shut down when unneeded then do
762 if (!u
->meta
.stop_when_unneeded
)
765 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
768 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
769 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
772 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY_OVERRIDABLE
], i
)
773 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
776 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTED_BY
], i
)
777 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
780 log_debug("Service %s is not needed anymore. Stopping.", u
->meta
.id
);
782 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
783 manager_add_job(u
->meta
.manager
, JOB_STOP
, u
, JOB_FAIL
, true, NULL
);
786 static void retroactively_start_dependencies(Unit
*u
) {
791 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
793 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
794 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
795 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
797 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
798 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
799 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
801 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
802 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
803 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
805 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
806 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
807 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
809 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
810 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
811 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
814 static void retroactively_stop_dependencies(Unit
*u
) {
819 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
821 if (u
->meta
.recursive_stop
) {
822 /* Pull down units need us recursively if enabled */
823 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
824 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
825 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
828 /* Garbage collect services that might not be needed anymore, if enabled */
829 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
830 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
831 unit_check_uneeded(other
);
832 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
833 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
834 unit_check_uneeded(other
);
835 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
836 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
837 unit_check_uneeded(other
);
838 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
839 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
840 unit_check_uneeded(other
);
841 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE_OVERRIDABLE
], i
)
842 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
843 unit_check_uneeded(other
);
846 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
) {
847 bool unexpected
= false;
850 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
851 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
853 /* Note that this is called for all low-level state changes,
854 * even if they might map to the same high-level
855 * UnitActiveState! That means that ns == os is OK an expected
856 * behaviour here. For example: if a mount point is remounted
857 * this function will be called too and the utmp code below
860 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
861 u
->meta
.active_enter_timestamp
= now(CLOCK_REALTIME
);
862 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
863 u
->meta
.active_exit_timestamp
= now(CLOCK_REALTIME
);
867 if (u
->meta
.job
->state
== JOB_WAITING
)
869 /* So we reached a different state for this
870 * job. Let's see if we can run it now if it
871 * failed previously due to EAGAIN. */
872 job_add_to_run_queue(u
->meta
.job
);
875 assert(u
->meta
.job
->state
== JOB_RUNNING
);
877 /* Let's check whether this state change
878 * constitutes a finished job, or maybe
879 * cotradicts a running job and hence needs to
880 * invalidate jobs. */
882 switch (u
->meta
.job
->type
) {
885 case JOB_VERIFY_ACTIVE
:
887 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
888 job_finish_and_invalidate(u
->meta
.job
, true);
889 else if (ns
!= UNIT_ACTIVATING
) {
891 job_finish_and_invalidate(u
->meta
.job
, false);
897 case JOB_RELOAD_OR_START
:
899 if (ns
== UNIT_ACTIVE
)
900 job_finish_and_invalidate(u
->meta
.job
, true);
901 else if (ns
!= UNIT_ACTIVATING
&& ns
!= UNIT_ACTIVE_RELOADING
) {
903 job_finish_and_invalidate(u
->meta
.job
, false);
910 case JOB_TRY_RESTART
:
912 if (ns
== UNIT_INACTIVE
)
913 job_finish_and_invalidate(u
->meta
.job
, true);
914 else if (ns
!= UNIT_DEACTIVATING
) {
916 job_finish_and_invalidate(u
->meta
.job
, false);
922 assert_not_reached("Job type unknown");
927 /* If this state change happened without being requested by a
928 * job, then let's retroactively start or stop dependencies */
931 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
932 retroactively_start_dependencies(u
);
933 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
934 retroactively_stop_dependencies(u
);
937 /* Some names are special */
938 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
939 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
)) {
940 /* The bus just might have become available,
941 * hence try to connect to it, if we aren't
943 bus_init_system(u
->meta
.manager
);
944 bus_init_api(u
->meta
.manager
);
947 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
))
948 /* The syslog daemon just might have become
949 * available, hence try to connect to it, if
950 * we aren't yet connected. */
953 if (u
->meta
.type
== UNIT_MOUNT
)
954 /* Another directory became available, let's
955 * check if that is enough to write our utmp
957 manager_write_utmp_reboot(u
->meta
.manager
);
959 if (u
->meta
.type
== UNIT_TARGET
)
960 /* A target got activated, maybe this is a runlevel? */
961 manager_write_utmp_runlevel(u
->meta
.manager
, u
);
963 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
965 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
))
966 /* The syslog daemon might just have
967 * terminated, hence try to disconnect from
971 /* We don't care about D-Bus here, since we'll get an
972 * asynchronous notification for it anyway. */
975 /* Maybe we finished startup and are now ready for being
976 * stopped because unneeded? */
977 unit_check_uneeded(u
);
979 unit_add_to_dbus_queue(u
);
982 int unit_watch_fd(Unit
*u
, int fd
, uint32_t events
, Watch
*w
) {
983 struct epoll_event ev
;
988 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_FD
&& w
->fd
== fd
&& w
->data
.unit
== u
));
994 if (epoll_ctl(u
->meta
.manager
->epoll_fd
,
995 w
->type
== WATCH_INVALID
? EPOLL_CTL_ADD
: EPOLL_CTL_MOD
,
1007 void unit_unwatch_fd(Unit
*u
, Watch
*w
) {
1011 if (w
->type
== WATCH_INVALID
)
1014 assert(w
->type
== WATCH_FD
);
1015 assert(w
->data
.unit
== u
);
1016 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1019 w
->type
= WATCH_INVALID
;
1020 w
->data
.unit
= NULL
;
1023 int unit_watch_pid(Unit
*u
, pid_t pid
) {
1027 /* Watch a specific PID. We only support one unit watching
1028 * each PID for now. */
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_value(u
->meta
.manager
->watch_pids
, UINT32_TO_PTR(pid
), u
);
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_REQUIRES_OVERRIDABLE
] = UNIT_REQUIRED_BY_OVERRIDABLE
,
1150 [UNIT_WANTS
] = UNIT_WANTED_BY
,
1151 [UNIT_REQUISITE
] = UNIT_REQUIRED_BY
,
1152 [UNIT_REQUISITE_OVERRIDABLE
] = UNIT_REQUIRED_BY_OVERRIDABLE
,
1153 [UNIT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1154 [UNIT_REQUIRED_BY_OVERRIDABLE
] = _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 (UNIT_VTABLE(u
)->no_requires
&&
1173 (d
== UNIT_REQUIRES
||
1174 d
== UNIT_REQUIRES_OVERRIDABLE
||
1175 d
== UNIT_REQUISITE
||
1176 d
== UNIT_REQUISITE_OVERRIDABLE
)) {
1180 if ((r
= set_ensure_allocated(&u
->meta
.dependencies
[d
], trivial_hash_func
, trivial_compare_func
)) < 0)
1183 if ((r
= set_ensure_allocated(&other
->meta
.dependencies
[inverse_table
[d
]], trivial_hash_func
, trivial_compare_func
)) < 0)
1186 if ((r
= set_put(u
->meta
.dependencies
[d
], other
)) < 0)
1189 if ((r
= set_put(other
->meta
.dependencies
[inverse_table
[d
]], u
)) < 0) {
1190 set_remove(u
->meta
.dependencies
[d
], other
);
1194 unit_add_to_dbus_queue(u
);
1198 static const char *resolve_template(Unit
*u
, const char *name
, const char*path
, char **p
) {
1202 assert(name
|| path
);
1205 name
= file_name_from_path(path
);
1207 if (!unit_name_is_template(name
)) {
1212 if (u
->meta
.instance
)
1213 s
= unit_name_replace_instance(name
, u
->meta
.instance
);
1217 if (!(i
= unit_name_to_prefix(u
->meta
.id
)))
1220 s
= unit_name_replace_instance(name
, i
);
1231 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, const char *path
) {
1237 assert(name
|| path
);
1239 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1242 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, &other
)) < 0)
1245 r
= unit_add_dependency(u
, d
, other
);
1252 int unit_add_dependency_by_name_inverse(Unit
*u
, UnitDependency d
, const char *name
, const char *path
) {
1258 assert(name
|| path
);
1260 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1263 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, &other
)) < 0)
1266 r
= unit_add_dependency(other
, d
, u
);
1273 int set_unit_path(const char *p
) {
1277 /* This is mostly for debug purposes */
1279 if (path_is_absolute(p
)) {
1280 if (!(c
= strdup(p
)))
1283 if (!(cwd
= get_current_dir_name()))
1286 r
= asprintf(&c
, "%s/%s", cwd
, p
);
1293 if (setenv("SYSTEMD_UNIT_PATH", c
, 0) < 0) {
1302 char *unit_dbus_path(Unit
*u
) {
1307 if (!(e
= bus_path_escape(u
->meta
.id
)))
1310 if (asprintf(&p
, "/org/freedesktop/systemd1/unit/%s", e
) < 0) {
1319 int unit_add_cgroup(Unit
*u
, CGroupBonding
*b
) {
1327 /* Ensure this hasn't been added yet */
1330 l
= hashmap_get(u
->meta
.manager
->cgroup_bondings
, b
->path
);
1331 LIST_PREPEND(CGroupBonding
, by_path
, l
, b
);
1333 if ((r
= hashmap_replace(u
->meta
.manager
->cgroup_bondings
, b
->path
, l
)) < 0) {
1334 LIST_REMOVE(CGroupBonding
, by_path
, l
, b
);
1338 LIST_PREPEND(CGroupBonding
, by_unit
, u
->meta
.cgroup_bondings
, b
);
1344 static char *default_cgroup_path(Unit
*u
) {
1350 if (u
->meta
.instance
) {
1353 if (!(t
= unit_name_template(u
->meta
.id
)))
1356 r
= asprintf(&p
, "%s/%s/%s", u
->meta
.manager
->cgroup_hierarchy
, t
, u
->meta
.instance
);
1359 r
= asprintf(&p
, "%s/%s", u
->meta
.manager
->cgroup_hierarchy
, u
->meta
.id
);
1361 return r
< 0 ? NULL
: p
;
1364 int unit_add_cgroup_from_text(Unit
*u
, const char *name
) {
1366 char *controller
= NULL
, *path
= NULL
;
1367 CGroupBonding
*b
= NULL
;
1373 /* Detect controller name */
1374 n
= strcspn(name
, ":");
1377 (name
[n
] == ':' && name
[n
+1] == 0)) {
1379 /* Only controller name, no path? */
1381 if (!(path
= default_cgroup_path(u
)))
1387 /* Controller name, and path. */
1390 if (!path_is_absolute(p
))
1393 if (!(path
= strdup(p
)))
1398 controller
= strndup(name
, n
);
1400 controller
= strdup(u
->meta
.manager
->cgroup_controller
);
1407 if (cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, controller
)) {
1412 if (!(b
= new0(CGroupBonding
, 1))) {
1417 b
->controller
= controller
;
1420 b
->clean_up
= false;
1422 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1435 int unit_add_default_cgroup(Unit
*u
) {
1441 /* Adds in the default cgroup data, if it wasn't specified yet */
1443 if (unit_get_default_cgroup(u
))
1446 if (!(b
= new0(CGroupBonding
, 1)))
1449 if (!(b
->controller
= strdup(u
->meta
.manager
->cgroup_controller
)))
1452 if (!(b
->path
= default_cgroup_path(u
)))
1458 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1465 free(b
->controller
);
1471 CGroupBonding
* unit_get_default_cgroup(Unit
*u
) {
1474 return cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, u
->meta
.manager
->cgroup_controller
);
1477 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
1485 if (!(t
= unit_name_change_suffix(u
->meta
.id
, type
)))
1488 assert(!unit_has_name(u
, t
));
1490 r
= manager_load_unit(u
->meta
.manager
, t
, NULL
, _found
);
1493 assert(r
< 0 || *_found
!= u
);
1498 static char *specifier_prefix_and_instance(char specifier
, void *data
, void *userdata
) {
1502 return unit_name_to_prefix_and_instance(u
->meta
.id
);
1505 static char *specifier_prefix(char specifier
, void *data
, void *userdata
) {
1509 return unit_name_to_prefix(u
->meta
.id
);
1512 static char *specifier_prefix_unescaped(char specifier
, void *data
, void *userdata
) {
1518 if (!(p
= unit_name_to_prefix(u
->meta
.id
)))
1521 r
= unit_name_unescape(p
);
1527 static char *specifier_instance_unescaped(char specifier
, void *data
, void *userdata
) {
1531 if (u
->meta
.instance
)
1532 return unit_name_unescape(u
->meta
.instance
);
1537 char *unit_name_printf(Unit
*u
, const char* format
) {
1540 * This will use the passed string as format string and
1541 * replace the following specifiers:
1543 * %n: the full id of the unit (foo@bar.waldo)
1544 * %N: the id of the unit without the suffix (foo@bar)
1545 * %p: the prefix (foo)
1546 * %i: the instance (bar)
1549 const Specifier table
[] = {
1550 { 'n', specifier_string
, u
->meta
.id
},
1551 { 'N', specifier_prefix_and_instance
, NULL
},
1552 { 'p', specifier_prefix
, NULL
},
1553 { 'i', specifier_string
, u
->meta
.instance
},
1560 return specifier_printf(format
, table
, u
);
1563 char *unit_full_printf(Unit
*u
, const char *format
) {
1565 /* This is similar to unit_name_printf() but also supports
1568 const Specifier table
[] = {
1569 { 'n', specifier_string
, u
->meta
.id
},
1570 { 'N', specifier_prefix_and_instance
, NULL
},
1571 { 'p', specifier_prefix
, NULL
},
1572 { 'P', specifier_prefix_unescaped
, NULL
},
1573 { 'i', specifier_string
, u
->meta
.instance
},
1574 { 'I', specifier_instance_unescaped
, NULL
},
1581 return specifier_printf(format
, table
, u
);
1584 char **unit_full_printf_strv(Unit
*u
, char **l
) {
1588 /* Applies unit_full_printf to every entry in l */
1593 if (!(r
= new(char*, n
+1)))
1596 for (i
= l
, j
= r
; *i
; i
++, j
++)
1597 if (!(*j
= unit_full_printf(u
, *i
)))
1613 int unit_watch_bus_name(Unit
*u
, const char *name
) {
1617 /* Watch a specific name on the bus. We only support one unit
1618 * watching each name for now. */
1620 return hashmap_put(u
->meta
.manager
->watch_bus
, name
, u
);
1623 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
1627 hashmap_remove_value(u
->meta
.manager
->watch_bus
, name
, u
);
1630 static const char* const unit_type_table
[_UNIT_TYPE_MAX
] = {
1631 [UNIT_SERVICE
] = "service",
1632 [UNIT_TIMER
] = "timer",
1633 [UNIT_SOCKET
] = "socket",
1634 [UNIT_TARGET
] = "target",
1635 [UNIT_DEVICE
] = "device",
1636 [UNIT_MOUNT
] = "mount",
1637 [UNIT_AUTOMOUNT
] = "automount",
1638 [UNIT_SNAPSHOT
] = "snapshot"
1641 DEFINE_STRING_TABLE_LOOKUP(unit_type
, UnitType
);
1643 static const char* const unit_load_state_table
[_UNIT_LOAD_STATE_MAX
] = {
1644 [UNIT_STUB
] = "stub",
1645 [UNIT_LOADED
] = "loaded",
1646 [UNIT_FAILED
] = "failed",
1647 [UNIT_MERGED
] = "merged"
1650 DEFINE_STRING_TABLE_LOOKUP(unit_load_state
, UnitLoadState
);
1652 static const char* const unit_active_state_table
[_UNIT_ACTIVE_STATE_MAX
] = {
1653 [UNIT_ACTIVE
] = "active",
1654 [UNIT_INACTIVE
] = "inactive",
1655 [UNIT_ACTIVATING
] = "activating",
1656 [UNIT_DEACTIVATING
] = "deactivating"
1659 DEFINE_STRING_TABLE_LOOKUP(unit_active_state
, UnitActiveState
);
1661 static const char* const unit_dependency_table
[_UNIT_DEPENDENCY_MAX
] = {
1662 [UNIT_REQUIRES
] = "Requires",
1663 [UNIT_REQUIRES_OVERRIDABLE
] = "RequiresOverridable",
1664 [UNIT_WANTS
] = "Wants",
1665 [UNIT_REQUISITE
] = "Requisite",
1666 [UNIT_REQUISITE_OVERRIDABLE
] = "RequisiteOverridable",
1667 [UNIT_REQUIRED_BY
] = "RequiredBy",
1668 [UNIT_REQUIRED_BY_OVERRIDABLE
] = "RequiredByOverridable",
1669 [UNIT_WANTED_BY
] = "WantedBy",
1670 [UNIT_CONFLICTS
] = "Conflicts",
1671 [UNIT_BEFORE
] = "Before",
1672 [UNIT_AFTER
] = "After",
1675 DEFINE_STRING_TABLE_LOOKUP(unit_dependency
, UnitDependency
);
1677 static const char* const kill_mode_table
[_KILL_MODE_MAX
] = {
1678 [KILL_CONTROL_GROUP
] = "control-group",
1679 [KILL_PROCESS_GROUP
] = "process-group",
1680 [KILL_PROCESS
] = "process",
1681 [KILL_NONE
] = "none"
1684 DEFINE_STRING_TABLE_LOOKUP(kill_mode
, KillMode
);