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 /* Common implementation for multiple backends */
619 int unit_load_nop(Unit
*u
) {
622 if (u
->meta
.load_state
== UNIT_STUB
)
623 u
->meta
.load_state
= UNIT_LOADED
;
628 int unit_load(Unit
*u
) {
633 if (u
->meta
.in_load_queue
) {
634 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
635 u
->meta
.in_load_queue
= false;
638 if (u
->meta
.type
== _UNIT_TYPE_INVALID
)
641 if (u
->meta
.load_state
!= UNIT_STUB
)
644 if (UNIT_VTABLE(u
)->load
)
645 if ((r
= UNIT_VTABLE(u
)->load(u
)) < 0)
648 if (u
->meta
.load_state
== UNIT_STUB
) {
653 assert((u
->meta
.load_state
!= UNIT_MERGED
) == !u
->meta
.merged_into
);
655 unit_add_to_dbus_queue(unit_follow_merge(u
));
660 u
->meta
.load_state
= UNIT_FAILED
;
661 unit_add_to_dbus_queue(u
);
663 log_error("Failed to load configuration for %s: %s", u
->meta
.id
, strerror(-r
));
669 * -EBADR: This unit type does not support starting.
670 * -EALREADY: Unit is already started.
671 * -EAGAIN: An operation is already in progress. Retry later.
673 int unit_start(Unit
*u
) {
674 UnitActiveState state
;
678 /* If this is already (being) started, then this will
679 * succeed. Note that this will even succeed if this unit is
680 * not startable by the user. This is relied on to detect when
681 * we need to wait for units and when waiting is finished. */
682 state
= unit_active_state(u
);
683 if (UNIT_IS_ACTIVE_OR_RELOADING(state
))
686 /* If it is stopped, but we cannot start it, then fail */
687 if (!UNIT_VTABLE(u
)->start
)
690 /* We don't suppress calls to ->start() here when we are
691 * already starting, to allow this request to be used as a
692 * "hurry up" call, for example when the unit is in some "auto
693 * restart" state where it waits for a holdoff timer to elapse
694 * before it will start again. */
696 unit_add_to_dbus_queue(u
);
697 return UNIT_VTABLE(u
)->start(u
);
700 bool unit_can_start(Unit
*u
) {
703 return !!UNIT_VTABLE(u
)->start
;
707 * -EBADR: This unit type does not support stopping.
708 * -EALREADY: Unit is already stopped.
709 * -EAGAIN: An operation is already in progress. Retry later.
711 int unit_stop(Unit
*u
) {
712 UnitActiveState state
;
716 state
= unit_active_state(u
);
717 if (state
== UNIT_INACTIVE
)
720 if (!UNIT_VTABLE(u
)->stop
)
723 unit_add_to_dbus_queue(u
);
724 return UNIT_VTABLE(u
)->stop(u
);
728 * -EBADR: This unit type does not support reloading.
729 * -ENOEXEC: Unit is not started.
730 * -EAGAIN: An operation is already in progress. Retry later.
732 int unit_reload(Unit
*u
) {
733 UnitActiveState state
;
737 if (!unit_can_reload(u
))
740 state
= unit_active_state(u
);
741 if (unit_active_state(u
) == UNIT_ACTIVE_RELOADING
)
744 if (unit_active_state(u
) != UNIT_ACTIVE
)
747 unit_add_to_dbus_queue(u
);
748 return UNIT_VTABLE(u
)->reload(u
);
751 bool unit_can_reload(Unit
*u
) {
754 if (!UNIT_VTABLE(u
)->reload
)
757 if (!UNIT_VTABLE(u
)->can_reload
)
760 return UNIT_VTABLE(u
)->can_reload(u
);
763 static void unit_check_uneeded(Unit
*u
) {
769 /* If this service shall be shut down when unneeded then do
772 if (!u
->meta
.stop_when_unneeded
)
775 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
778 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
779 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
782 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY_OVERRIDABLE
], i
)
783 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
786 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTED_BY
], i
)
787 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
790 log_debug("Service %s is not needed anymore. Stopping.", u
->meta
.id
);
792 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
793 manager_add_job(u
->meta
.manager
, JOB_STOP
, u
, JOB_FAIL
, true, NULL
);
796 static void retroactively_start_dependencies(Unit
*u
) {
801 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
803 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
804 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
805 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
807 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES_OVERRIDABLE
], i
)
808 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
809 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
811 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
812 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
813 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
815 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
816 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
817 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
819 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
820 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
821 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
824 static void retroactively_stop_dependencies(Unit
*u
) {
829 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
831 if (u
->meta
.recursive_stop
) {
832 /* Pull down units need us recursively if enabled */
833 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
834 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
835 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
838 /* Garbage collect services that might not be needed anymore, if enabled */
839 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], 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_REQUIRES_OVERRIDABLE
], i
)
843 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
844 unit_check_uneeded(other
);
845 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
846 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
847 unit_check_uneeded(other
);
848 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
849 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
850 unit_check_uneeded(other
);
851 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE_OVERRIDABLE
], i
)
852 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
853 unit_check_uneeded(other
);
856 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
) {
857 bool unexpected
= false;
860 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
861 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
863 /* Note that this is called for all low-level state changes,
864 * even if they might map to the same high-level
865 * UnitActiveState! That means that ns == os is OK an expected
866 * behaviour here. For example: if a mount point is remounted
867 * this function will be called too and the utmp code below
870 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
871 u
->meta
.active_enter_timestamp
= now(CLOCK_REALTIME
);
872 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
873 u
->meta
.active_exit_timestamp
= now(CLOCK_REALTIME
);
877 if (u
->meta
.job
->state
== JOB_WAITING
)
879 /* So we reached a different state for this
880 * job. Let's see if we can run it now if it
881 * failed previously due to EAGAIN. */
882 job_add_to_run_queue(u
->meta
.job
);
885 assert(u
->meta
.job
->state
== JOB_RUNNING
);
887 /* Let's check whether this state change
888 * constitutes a finished job, or maybe
889 * cotradicts a running job and hence needs to
890 * invalidate jobs. */
892 switch (u
->meta
.job
->type
) {
895 case JOB_VERIFY_ACTIVE
:
897 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
898 job_finish_and_invalidate(u
->meta
.job
, true);
899 else if (ns
!= UNIT_ACTIVATING
) {
901 job_finish_and_invalidate(u
->meta
.job
, false);
907 case JOB_RELOAD_OR_START
:
909 if (ns
== UNIT_ACTIVE
)
910 job_finish_and_invalidate(u
->meta
.job
, true);
911 else if (ns
!= UNIT_ACTIVATING
&& ns
!= UNIT_ACTIVE_RELOADING
) {
913 job_finish_and_invalidate(u
->meta
.job
, false);
920 case JOB_TRY_RESTART
:
922 if (ns
== UNIT_INACTIVE
)
923 job_finish_and_invalidate(u
->meta
.job
, true);
924 else if (ns
!= UNIT_DEACTIVATING
) {
926 job_finish_and_invalidate(u
->meta
.job
, false);
932 assert_not_reached("Job type unknown");
937 /* If this state change happened without being requested by a
938 * job, then let's retroactively start or stop dependencies */
941 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
942 retroactively_start_dependencies(u
);
943 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
944 retroactively_stop_dependencies(u
);
947 /* Some names are special */
948 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
949 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
)) {
950 /* The bus just might have become available,
951 * hence try to connect to it, if we aren't
953 bus_init_system(u
->meta
.manager
);
954 bus_init_api(u
->meta
.manager
);
957 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
))
958 /* The syslog daemon just might have become
959 * available, hence try to connect to it, if
960 * we aren't yet connected. */
963 if (u
->meta
.type
== UNIT_MOUNT
)
964 /* Another directory became available, let's
965 * check if that is enough to write our utmp
967 manager_write_utmp_reboot(u
->meta
.manager
);
969 if (u
->meta
.type
== UNIT_TARGET
)
970 /* A target got activated, maybe this is a runlevel? */
971 manager_write_utmp_runlevel(u
->meta
.manager
, u
);
973 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
975 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
))
976 /* The syslog daemon might just have
977 * terminated, hence try to disconnect from
981 /* We don't care about D-Bus here, since we'll get an
982 * asynchronous notification for it anyway. */
985 /* Maybe we finished startup and are now ready for being
986 * stopped because unneeded? */
987 unit_check_uneeded(u
);
989 unit_add_to_dbus_queue(u
);
992 int unit_watch_fd(Unit
*u
, int fd
, uint32_t events
, Watch
*w
) {
993 struct epoll_event ev
;
998 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_FD
&& w
->fd
== fd
&& w
->data
.unit
== u
));
1004 if (epoll_ctl(u
->meta
.manager
->epoll_fd
,
1005 w
->type
== WATCH_INVALID
? EPOLL_CTL_ADD
: EPOLL_CTL_MOD
,
1017 void unit_unwatch_fd(Unit
*u
, Watch
*w
) {
1021 if (w
->type
== WATCH_INVALID
)
1024 assert(w
->type
== WATCH_FD
);
1025 assert(w
->data
.unit
== u
);
1026 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1029 w
->type
= WATCH_INVALID
;
1030 w
->data
.unit
= NULL
;
1033 int unit_watch_pid(Unit
*u
, pid_t pid
) {
1037 /* Watch a specific PID. We only support one unit watching
1038 * each PID for now. */
1040 return hashmap_put(u
->meta
.manager
->watch_pids
, UINT32_TO_PTR(pid
), u
);
1043 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
1047 hashmap_remove_value(u
->meta
.manager
->watch_pids
, UINT32_TO_PTR(pid
), u
);
1050 int unit_watch_timer(Unit
*u
, usec_t delay
, Watch
*w
) {
1051 struct itimerspec its
;
1057 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_TIMER
&& w
->data
.unit
== u
));
1059 /* This will try to reuse the old timer if there is one */
1061 if (w
->type
== WATCH_TIMER
) {
1066 if ((fd
= timerfd_create(CLOCK_MONOTONIC
, TFD_NONBLOCK
|TFD_CLOEXEC
)) < 0)
1073 /* Set absolute time in the past, but not 0, since we
1074 * don't want to disarm the timer */
1075 its
.it_value
.tv_sec
= 0;
1076 its
.it_value
.tv_nsec
= 1;
1078 flags
= TFD_TIMER_ABSTIME
;
1080 timespec_store(&its
.it_value
, delay
);
1084 /* This will also flush the elapse counter */
1085 if (timerfd_settime(fd
, flags
, &its
, NULL
) < 0)
1088 if (w
->type
== WATCH_INVALID
) {
1089 struct epoll_event ev
;
1093 ev
.events
= EPOLLIN
;
1095 if (epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_ADD
, fd
, &ev
) < 0)
1100 w
->type
= WATCH_TIMER
;
1107 close_nointr_nofail(fd
);
1112 void unit_unwatch_timer(Unit
*u
, Watch
*w
) {
1116 if (w
->type
== WATCH_INVALID
)
1119 assert(w
->type
== WATCH_TIMER
&& w
->data
.unit
== u
);
1121 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1122 close_nointr_nofail(w
->fd
);
1125 w
->type
= WATCH_INVALID
;
1126 w
->data
.unit
= NULL
;
1129 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
1131 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
1135 case JOB_VERIFY_ACTIVE
:
1141 case JOB_TRY_RESTART
:
1142 return unit_can_start(u
);
1145 return unit_can_reload(u
);
1147 case JOB_RELOAD_OR_START
:
1148 return unit_can_reload(u
) && unit_can_start(u
);
1151 assert_not_reached("Invalid job type");
1155 int unit_add_dependency(Unit
*u
, UnitDependency d
, Unit
*other
) {
1157 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
1158 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
1159 [UNIT_REQUIRES_OVERRIDABLE
] = UNIT_REQUIRED_BY_OVERRIDABLE
,
1160 [UNIT_WANTS
] = UNIT_WANTED_BY
,
1161 [UNIT_REQUISITE
] = UNIT_REQUIRED_BY
,
1162 [UNIT_REQUISITE_OVERRIDABLE
] = UNIT_REQUIRED_BY_OVERRIDABLE
,
1163 [UNIT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1164 [UNIT_REQUIRED_BY_OVERRIDABLE
] = _UNIT_DEPENDENCY_INVALID
,
1165 [UNIT_WANTED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1166 [UNIT_CONFLICTS
] = UNIT_CONFLICTS
,
1167 [UNIT_BEFORE
] = UNIT_AFTER
,
1168 [UNIT_AFTER
] = UNIT_BEFORE
1173 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
1174 assert(inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
);
1177 /* We won't allow dependencies on ourselves. We will not
1178 * consider them an error however. */
1182 if (UNIT_VTABLE(u
)->no_requires
&&
1183 (d
== UNIT_REQUIRES
||
1184 d
== UNIT_REQUIRES_OVERRIDABLE
||
1185 d
== UNIT_REQUISITE
||
1186 d
== UNIT_REQUISITE_OVERRIDABLE
)) {
1190 if ((r
= set_ensure_allocated(&u
->meta
.dependencies
[d
], trivial_hash_func
, trivial_compare_func
)) < 0)
1193 if ((r
= set_ensure_allocated(&other
->meta
.dependencies
[inverse_table
[d
]], trivial_hash_func
, trivial_compare_func
)) < 0)
1196 if ((r
= set_put(u
->meta
.dependencies
[d
], other
)) < 0)
1199 if ((r
= set_put(other
->meta
.dependencies
[inverse_table
[d
]], u
)) < 0) {
1200 set_remove(u
->meta
.dependencies
[d
], other
);
1204 unit_add_to_dbus_queue(u
);
1208 static const char *resolve_template(Unit
*u
, const char *name
, const char*path
, char **p
) {
1212 assert(name
|| path
);
1215 name
= file_name_from_path(path
);
1217 if (!unit_name_is_template(name
)) {
1222 if (u
->meta
.instance
)
1223 s
= unit_name_replace_instance(name
, u
->meta
.instance
);
1227 if (!(i
= unit_name_to_prefix(u
->meta
.id
)))
1230 s
= unit_name_replace_instance(name
, i
);
1241 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
, const char *path
) {
1247 assert(name
|| path
);
1249 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1252 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, &other
)) < 0)
1255 r
= unit_add_dependency(u
, d
, other
);
1262 int unit_add_dependency_by_name_inverse(Unit
*u
, UnitDependency d
, const char *name
, const char *path
) {
1268 assert(name
|| path
);
1270 if (!(name
= resolve_template(u
, name
, path
, &s
)))
1273 if ((r
= manager_load_unit(u
->meta
.manager
, name
, path
, &other
)) < 0)
1276 r
= unit_add_dependency(other
, d
, u
);
1283 int set_unit_path(const char *p
) {
1287 /* This is mostly for debug purposes */
1289 if (path_is_absolute(p
)) {
1290 if (!(c
= strdup(p
)))
1293 if (!(cwd
= get_current_dir_name()))
1296 r
= asprintf(&c
, "%s/%s", cwd
, p
);
1303 if (setenv("SYSTEMD_UNIT_PATH", c
, 0) < 0) {
1312 char *unit_dbus_path(Unit
*u
) {
1317 if (!(e
= bus_path_escape(u
->meta
.id
)))
1320 if (asprintf(&p
, "/org/freedesktop/systemd1/unit/%s", e
) < 0) {
1329 int unit_add_cgroup(Unit
*u
, CGroupBonding
*b
) {
1337 /* Ensure this hasn't been added yet */
1340 l
= hashmap_get(u
->meta
.manager
->cgroup_bondings
, b
->path
);
1341 LIST_PREPEND(CGroupBonding
, by_path
, l
, b
);
1343 if ((r
= hashmap_replace(u
->meta
.manager
->cgroup_bondings
, b
->path
, l
)) < 0) {
1344 LIST_REMOVE(CGroupBonding
, by_path
, l
, b
);
1348 LIST_PREPEND(CGroupBonding
, by_unit
, u
->meta
.cgroup_bondings
, b
);
1354 static char *default_cgroup_path(Unit
*u
) {
1360 if (u
->meta
.instance
) {
1363 if (!(t
= unit_name_template(u
->meta
.id
)))
1366 r
= asprintf(&p
, "%s/%s/%s", u
->meta
.manager
->cgroup_hierarchy
, t
, u
->meta
.instance
);
1369 r
= asprintf(&p
, "%s/%s", u
->meta
.manager
->cgroup_hierarchy
, u
->meta
.id
);
1371 return r
< 0 ? NULL
: p
;
1374 int unit_add_cgroup_from_text(Unit
*u
, const char *name
) {
1376 char *controller
= NULL
, *path
= NULL
;
1377 CGroupBonding
*b
= NULL
;
1383 /* Detect controller name */
1384 n
= strcspn(name
, ":");
1387 (name
[n
] == ':' && name
[n
+1] == 0)) {
1389 /* Only controller name, no path? */
1391 if (!(path
= default_cgroup_path(u
)))
1397 /* Controller name, and path. */
1400 if (!path_is_absolute(p
))
1403 if (!(path
= strdup(p
)))
1408 controller
= strndup(name
, n
);
1410 controller
= strdup(u
->meta
.manager
->cgroup_controller
);
1417 if (cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, controller
)) {
1422 if (!(b
= new0(CGroupBonding
, 1))) {
1427 b
->controller
= controller
;
1430 b
->clean_up
= false;
1432 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1445 int unit_add_default_cgroup(Unit
*u
) {
1451 /* Adds in the default cgroup data, if it wasn't specified yet */
1453 if (unit_get_default_cgroup(u
))
1456 if (!(b
= new0(CGroupBonding
, 1)))
1459 if (!(b
->controller
= strdup(u
->meta
.manager
->cgroup_controller
)))
1462 if (!(b
->path
= default_cgroup_path(u
)))
1468 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1475 free(b
->controller
);
1481 CGroupBonding
* unit_get_default_cgroup(Unit
*u
) {
1484 return cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, u
->meta
.manager
->cgroup_controller
);
1487 int unit_load_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
1495 if (!(t
= unit_name_change_suffix(u
->meta
.id
, type
)))
1498 assert(!unit_has_name(u
, t
));
1500 r
= manager_load_unit(u
->meta
.manager
, t
, NULL
, _found
);
1503 assert(r
< 0 || *_found
!= u
);
1508 int unit_get_related_unit(Unit
*u
, const char *type
, Unit
**_found
) {
1516 if (!(t
= unit_name_change_suffix(u
->meta
.id
, type
)))
1519 assert(!unit_has_name(u
, t
));
1521 found
= manager_get_unit(u
->meta
.manager
, t
);
1531 static char *specifier_prefix_and_instance(char specifier
, void *data
, void *userdata
) {
1535 return unit_name_to_prefix_and_instance(u
->meta
.id
);
1538 static char *specifier_prefix(char specifier
, void *data
, void *userdata
) {
1542 return unit_name_to_prefix(u
->meta
.id
);
1545 static char *specifier_prefix_unescaped(char specifier
, void *data
, void *userdata
) {
1551 if (!(p
= unit_name_to_prefix(u
->meta
.id
)))
1554 r
= unit_name_unescape(p
);
1560 static char *specifier_instance_unescaped(char specifier
, void *data
, void *userdata
) {
1564 if (u
->meta
.instance
)
1565 return unit_name_unescape(u
->meta
.instance
);
1570 char *unit_name_printf(Unit
*u
, const char* format
) {
1573 * This will use the passed string as format string and
1574 * replace the following specifiers:
1576 * %n: the full id of the unit (foo@bar.waldo)
1577 * %N: the id of the unit without the suffix (foo@bar)
1578 * %p: the prefix (foo)
1579 * %i: the instance (bar)
1582 const Specifier table
[] = {
1583 { 'n', specifier_string
, u
->meta
.id
},
1584 { 'N', specifier_prefix_and_instance
, NULL
},
1585 { 'p', specifier_prefix
, NULL
},
1586 { 'i', specifier_string
, u
->meta
.instance
},
1593 return specifier_printf(format
, table
, u
);
1596 char *unit_full_printf(Unit
*u
, const char *format
) {
1598 /* This is similar to unit_name_printf() but also supports
1601 const Specifier table
[] = {
1602 { 'n', specifier_string
, u
->meta
.id
},
1603 { 'N', specifier_prefix_and_instance
, NULL
},
1604 { 'p', specifier_prefix
, NULL
},
1605 { 'P', specifier_prefix_unescaped
, NULL
},
1606 { 'i', specifier_string
, u
->meta
.instance
},
1607 { 'I', specifier_instance_unescaped
, NULL
},
1614 return specifier_printf(format
, table
, u
);
1617 char **unit_full_printf_strv(Unit
*u
, char **l
) {
1621 /* Applies unit_full_printf to every entry in l */
1626 if (!(r
= new(char*, n
+1)))
1629 for (i
= l
, j
= r
; *i
; i
++, j
++)
1630 if (!(*j
= unit_full_printf(u
, *i
)))
1646 int unit_watch_bus_name(Unit
*u
, const char *name
) {
1650 /* Watch a specific name on the bus. We only support one unit
1651 * watching each name for now. */
1653 return hashmap_put(u
->meta
.manager
->watch_bus
, name
, u
);
1656 void unit_unwatch_bus_name(Unit
*u
, const char *name
) {
1660 hashmap_remove_value(u
->meta
.manager
->watch_bus
, name
, u
);
1663 bool unit_can_serialize(Unit
*u
) {
1666 return UNIT_VTABLE(u
)->serialize
&& UNIT_VTABLE(u
)->deserialize_item
;
1669 int unit_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
1676 if (!unit_can_serialize(u
))
1679 if ((r
= UNIT_VTABLE(u
)->serialize(u
, f
, fds
)) < 0)
1687 void unit_serialize_item_format(Unit
*u
, FILE *f
, const char *key
, const char *format
, ...) {
1698 va_start(ap
, format
);
1699 vfprintf(f
, format
, ap
);
1705 void unit_serialize_item(Unit
*u
, FILE *f
, const char *key
, const char *value
) {
1711 fprintf(f
, "%s=%s\n", key
, value
);
1714 int unit_deserialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
1721 if (!unit_can_serialize(u
))
1725 char line
[1024], *l
, *v
;
1728 if (!fgets(line
, sizeof(line
), f
)) {
1740 k
= strcspn(l
, "=");
1748 if ((r
= UNIT_VTABLE(u
)->deserialize_item(u
, l
, v
, fds
)) < 0)
1754 static const char* const unit_type_table
[_UNIT_TYPE_MAX
] = {
1755 [UNIT_SERVICE
] = "service",
1756 [UNIT_TIMER
] = "timer",
1757 [UNIT_SOCKET
] = "socket",
1758 [UNIT_TARGET
] = "target",
1759 [UNIT_DEVICE
] = "device",
1760 [UNIT_MOUNT
] = "mount",
1761 [UNIT_AUTOMOUNT
] = "automount",
1762 [UNIT_SNAPSHOT
] = "snapshot"
1765 DEFINE_STRING_TABLE_LOOKUP(unit_type
, UnitType
);
1767 static const char* const unit_load_state_table
[_UNIT_LOAD_STATE_MAX
] = {
1768 [UNIT_STUB
] = "stub",
1769 [UNIT_LOADED
] = "loaded",
1770 [UNIT_FAILED
] = "failed",
1771 [UNIT_MERGED
] = "merged"
1774 DEFINE_STRING_TABLE_LOOKUP(unit_load_state
, UnitLoadState
);
1776 static const char* const unit_active_state_table
[_UNIT_ACTIVE_STATE_MAX
] = {
1777 [UNIT_ACTIVE
] = "active",
1778 [UNIT_INACTIVE
] = "inactive",
1779 [UNIT_ACTIVATING
] = "activating",
1780 [UNIT_DEACTIVATING
] = "deactivating"
1783 DEFINE_STRING_TABLE_LOOKUP(unit_active_state
, UnitActiveState
);
1785 static const char* const unit_dependency_table
[_UNIT_DEPENDENCY_MAX
] = {
1786 [UNIT_REQUIRES
] = "Requires",
1787 [UNIT_REQUIRES_OVERRIDABLE
] = "RequiresOverridable",
1788 [UNIT_WANTS
] = "Wants",
1789 [UNIT_REQUISITE
] = "Requisite",
1790 [UNIT_REQUISITE_OVERRIDABLE
] = "RequisiteOverridable",
1791 [UNIT_REQUIRED_BY
] = "RequiredBy",
1792 [UNIT_REQUIRED_BY_OVERRIDABLE
] = "RequiredByOverridable",
1793 [UNIT_WANTED_BY
] = "WantedBy",
1794 [UNIT_CONFLICTS
] = "Conflicts",
1795 [UNIT_BEFORE
] = "Before",
1796 [UNIT_AFTER
] = "After",
1799 DEFINE_STRING_TABLE_LOOKUP(unit_dependency
, UnitDependency
);
1801 static const char* const kill_mode_table
[_KILL_MODE_MAX
] = {
1802 [KILL_CONTROL_GROUP
] = "control-group",
1803 [KILL_PROCESS_GROUP
] = "process-group",
1804 [KILL_PROCESS
] = "process",
1805 [KILL_NONE
] = "none"
1808 DEFINE_STRING_TABLE_LOOKUP(kill_mode
, KillMode
);