1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/epoll.h>
26 #include <sys/timerfd.h>
35 #include "load-fragment.h"
36 #include "load-dropin.h"
39 const UnitVTable
* const unit_vtable
[_UNIT_TYPE_MAX
] = {
40 [UNIT_SERVICE
] = &service_vtable
,
41 [UNIT_TIMER
] = &timer_vtable
,
42 [UNIT_SOCKET
] = &socket_vtable
,
43 [UNIT_TARGET
] = &target_vtable
,
44 [UNIT_DEVICE
] = &device_vtable
,
45 [UNIT_MOUNT
] = &mount_vtable
,
46 [UNIT_AUTOMOUNT
] = &automount_vtable
,
47 [UNIT_SNAPSHOT
] = &snapshot_vtable
50 UnitType
unit_name_to_type(const char *n
) {
55 for (t
= 0; t
< _UNIT_TYPE_MAX
; t
++)
56 if (endswith(n
, unit_vtable
[t
]->suffix
))
59 return _UNIT_TYPE_INVALID
;
64 "abcdefghijklmnopqrstuvwxyz" \
65 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
68 bool unit_name_is_valid(const char *n
) {
74 if (strlen(n
) >= UNIT_NAME_MAX
)
77 t
= unit_name_to_type(n
);
78 if (t
< 0 || t
>= _UNIT_TYPE_MAX
)
81 if (!(e
= strrchr(n
, '.')))
87 for (i
= n
; i
< e
; i
++)
88 if (!strchr(VALID_CHARS
, *i
))
94 char *unit_name_change_suffix(const char *n
, const char *suffix
) {
99 assert(unit_name_is_valid(n
));
102 assert_se(e
= strrchr(n
, '.'));
106 if (!(r
= new(char, a
+ b
+ 1)))
110 memcpy(r
+a
, suffix
, b
+1);
115 Unit
*unit_new(Manager
*m
) {
120 if (!(u
= new0(Unit
, 1)))
123 if (!(u
->meta
.names
= set_new(string_hash_func
, string_compare_func
))) {
129 u
->meta
.type
= _UNIT_TYPE_INVALID
;
134 bool unit_has_name(Unit
*u
, const char *name
) {
138 return !!set_get(u
->meta
.names
, (char*) name
);
141 int unit_add_name(Unit
*u
, const char *text
) {
149 if (!unit_name_is_valid(text
))
152 if ((t
= unit_name_to_type(text
)) == _UNIT_TYPE_INVALID
)
155 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
&& t
!= u
->meta
.type
)
158 if (!(s
= strdup(text
)))
161 if ((r
= set_put(u
->meta
.names
, s
)) < 0) {
170 if ((r
= hashmap_put(u
->meta
.manager
->units
, s
, u
)) < 0) {
171 set_remove(u
->meta
.names
, s
);
176 if (u
->meta
.type
== _UNIT_TYPE_INVALID
)
177 LIST_PREPEND(Meta
, units_per_type
, u
->meta
.manager
->units_per_type
[t
], &u
->meta
);
184 unit_add_to_dbus_queue(u
);
188 int unit_choose_id(Unit
*u
, const char *name
) {
194 /* Selects one of the names of this unit as the id */
196 if (!(s
= set_get(u
->meta
.names
, (char*) name
)))
201 unit_add_to_dbus_queue(u
);
205 int unit_set_description(Unit
*u
, const char *description
) {
210 if (!(s
= strdup(description
)))
213 free(u
->meta
.description
);
214 u
->meta
.description
= s
;
216 unit_add_to_dbus_queue(u
);
220 void unit_add_to_load_queue(Unit
*u
) {
222 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
224 if (u
->meta
.load_state
!= UNIT_STUB
|| u
->meta
.in_load_queue
)
227 LIST_PREPEND(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
228 u
->meta
.in_load_queue
= true;
231 void unit_add_to_cleanup_queue(Unit
*u
) {
234 if (u
->meta
.in_cleanup_queue
)
237 LIST_PREPEND(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
238 u
->meta
.in_cleanup_queue
= true;
241 void unit_add_to_dbus_queue(Unit
*u
) {
243 assert(u
->meta
.type
!= _UNIT_TYPE_INVALID
);
245 if (u
->meta
.load_state
== UNIT_STUB
|| u
->meta
.in_dbus_queue
|| set_isempty(u
->meta
.manager
->subscribed
))
248 LIST_PREPEND(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
249 u
->meta
.in_dbus_queue
= true;
252 static void bidi_set_free(Unit
*u
, Set
*s
) {
258 /* Frees the set and makes sure we are dropped from the
259 * inverse pointers */
261 SET_FOREACH(other
, s
, i
) {
264 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
265 set_remove(other
->meta
.dependencies
[d
], u
);
271 void unit_free(Unit
*u
) {
278 bus_unit_send_removed_signal(u
);
280 /* Detach from next 'bigger' objects */
282 cgroup_bonding_free_list(u
->meta
.cgroup_bondings
);
284 SET_FOREACH(t
, u
->meta
.names
, i
)
285 hashmap_remove_value(u
->meta
.manager
->units
, t
, u
);
287 if (u
->meta
.type
!= _UNIT_TYPE_INVALID
)
288 LIST_REMOVE(Meta
, units_per_type
, u
->meta
.manager
->units_per_type
[u
->meta
.type
], &u
->meta
);
290 if (u
->meta
.in_load_queue
)
291 LIST_REMOVE(Meta
, load_queue
, u
->meta
.manager
->load_queue
, &u
->meta
);
293 if (u
->meta
.in_dbus_queue
)
294 LIST_REMOVE(Meta
, dbus_queue
, u
->meta
.manager
->dbus_unit_queue
, &u
->meta
);
296 if (u
->meta
.in_cleanup_queue
)
297 LIST_REMOVE(Meta
, cleanup_queue
, u
->meta
.manager
->cleanup_queue
, &u
->meta
);
299 if (u
->meta
.load_state
!= UNIT_STUB
)
300 if (UNIT_VTABLE(u
)->done
)
301 UNIT_VTABLE(u
)->done(u
);
303 /* Free data and next 'smaller' objects */
305 job_free(u
->meta
.job
);
307 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
308 bidi_set_free(u
, u
->meta
.dependencies
[d
]);
310 free(u
->meta
.description
);
311 free(u
->meta
.fragment_path
);
313 while ((t
= set_steal_first(u
->meta
.names
)))
315 set_free(u
->meta
.names
);
320 UnitActiveState
unit_active_state(Unit
*u
) {
323 if (u
->meta
.load_state
!= UNIT_LOADED
)
324 return UNIT_INACTIVE
;
326 return UNIT_VTABLE(u
)->active_state(u
);
329 static void complete_move(Set
**s
, Set
**other
) {
337 set_move(*s
, *other
);
344 static void merge_names(Unit
*u
, Unit
*other
) {
351 complete_move(&u
->meta
.names
, &other
->meta
.names
);
353 while ((t
= set_steal_first(other
->meta
.names
)))
356 set_free(other
->meta
.names
);
357 other
->meta
.names
= NULL
;
358 other
->meta
.id
= NULL
;
360 SET_FOREACH(t
, u
->meta
.names
, i
)
361 assert_se(hashmap_replace(u
->meta
.manager
->units
, t
, u
) == 0);
364 static void merge_dependencies(Unit
*u
, Unit
*other
, UnitDependency d
) {
371 assert(d
< _UNIT_DEPENDENCY_MAX
);
373 SET_FOREACH(back
, other
->meta
.dependencies
[d
], i
) {
376 for (k
= 0; k
< _UNIT_DEPENDENCY_MAX
; k
++)
377 if ((r
= set_remove_and_put(back
->meta
.dependencies
[k
], other
, u
)) < 0) {
380 set_remove(back
->meta
.dependencies
[k
], other
);
382 assert(r
== -ENOENT
);
386 complete_move(&u
->meta
.dependencies
[d
], &other
->meta
.dependencies
[d
]);
388 set_free(other
->meta
.dependencies
[d
]);
389 other
->meta
.dependencies
[d
] = NULL
;
392 int unit_merge(Unit
*u
, Unit
*other
) {
397 assert(u
->meta
.manager
== other
->meta
.manager
);
399 other
= unit_follow_merge(other
);
404 /* This merges 'other' into 'unit'. FIXME: This does not
405 * rollback on failure. */
407 if (u
->meta
.type
!= u
->meta
.type
)
410 if (other
->meta
.load_state
!= UNIT_STUB
&&
411 other
->meta
.load_state
!= UNIT_FAILED
)
417 if (unit_active_state(other
) != UNIT_INACTIVE
)
421 merge_names(u
, other
);
423 /* Merge dependencies */
424 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++)
425 merge_dependencies(u
, other
, d
);
427 other
->meta
.load_state
= UNIT_MERGED
;
428 other
->meta
.merged_into
= u
;
430 /* If there is still some data attached to the other node, we
431 * don't need it anymore, and can free it. */
432 if (other
->meta
.load_state
!= UNIT_STUB
)
433 if (UNIT_VTABLE(other
)->done
)
434 UNIT_VTABLE(other
)->done(other
);
436 unit_add_to_dbus_queue(u
);
437 unit_add_to_cleanup_queue(other
);
442 int unit_merge_by_name(Unit
*u
, const char *name
) {
448 if (!(other
= manager_get_unit(u
->meta
.manager
, name
)))
449 return unit_add_name(u
, name
);
451 return unit_merge(u
, other
);
454 Unit
* unit_follow_merge(Unit
*u
) {
457 while (u
->meta
.load_state
== UNIT_MERGED
)
458 assert_se(u
= u
->meta
.merged_into
);
463 int unit_add_exec_dependencies(Unit
*u
, ExecContext
*c
) {
469 if (c
->output
!= EXEC_OUTPUT_KERNEL
&& c
->output
!= EXEC_OUTPUT_SYSLOG
)
472 /* If syslog or kernel logging is requested, make sure our own
473 * logging daemon is run first. */
475 if ((r
= unit_add_dependency_by_name(u
, UNIT_AFTER
, SPECIAL_LOGGER_SOCKET
)) < 0)
478 if (u
->meta
.manager
->running_as
!= MANAGER_SESSION
)
479 if ((r
= unit_add_dependency_by_name(u
, UNIT_REQUIRES
, SPECIAL_LOGGER_SOCKET
)) < 0)
485 const char* unit_id(Unit
*u
) {
491 return set_first(u
->meta
.names
);
494 const char *unit_description(Unit
*u
) {
497 if (u
->meta
.description
)
498 return u
->meta
.description
;
503 void unit_dump(Unit
*u
, FILE *f
, const char *prefix
) {
510 char timestamp1
[FORMAT_TIMESTAMP_MAX
], timestamp2
[FORMAT_TIMESTAMP_MAX
];
516 p2
= strappend(prefix
, "\t");
517 prefix2
= p2
? p2
: prefix
;
521 "%s\tDescription: %s\n"
522 "%s\tUnit Load State: %s\n"
523 "%s\tUnit Active State: %s\n"
524 "%s\tActive Enter Timestamp: %s\n"
525 "%s\tActive Exit Timestamp: %s\n",
527 prefix
, unit_description(u
),
528 prefix
, unit_load_state_to_string(u
->meta
.load_state
),
529 prefix
, unit_active_state_to_string(unit_active_state(u
)),
530 prefix
, strna(format_timestamp(timestamp1
, sizeof(timestamp1
), u
->meta
.active_enter_timestamp
)),
531 prefix
, strna(format_timestamp(timestamp2
, sizeof(timestamp2
), u
->meta
.active_exit_timestamp
)));
533 SET_FOREACH(t
, u
->meta
.names
, i
)
534 fprintf(f
, "%s\tName: %s\n", prefix
, t
);
536 if (u
->meta
.fragment_path
)
537 fprintf(f
, "%s\tFragment Path: %s\n", prefix
, u
->meta
.fragment_path
);
539 for (d
= 0; d
< _UNIT_DEPENDENCY_MAX
; d
++) {
542 SET_FOREACH(other
, u
->meta
.dependencies
[d
], i
)
543 fprintf(f
, "%s\t%s: %s\n", prefix
, unit_dependency_to_string(d
), unit_id(other
));
546 if (u
->meta
.load_state
== UNIT_LOADED
) {
548 "%s\tRecursive Stop: %s\n"
549 "%s\tStop When Unneeded: %s\n",
550 prefix
, yes_no(u
->meta
.recursive_stop
),
551 prefix
, yes_no(u
->meta
.stop_when_unneeded
));
553 LIST_FOREACH(by_unit
, b
, u
->meta
.cgroup_bondings
)
554 fprintf(f
, "%s\tControlGroup: %s:%s\n",
555 prefix
, b
->controller
, b
->path
);
557 if (UNIT_VTABLE(u
)->dump
)
558 UNIT_VTABLE(u
)->dump(u
, f
, prefix2
);
560 } else if (u
->meta
.load_state
== UNIT_MERGED
)
562 "%s\tMerged into: %s\n",
563 prefix
, unit_id(u
->meta
.merged_into
));
566 job_dump(u
->meta
.job
, f
, prefix2
);
571 /* Common implementation for multiple backends */
572 int unit_load_fragment_and_dropin(Unit
*u
, UnitLoadState
*new_state
) {
577 assert(*new_state
== UNIT_STUB
|| *new_state
== UNIT_LOADED
);
579 /* Load a .service file */
580 if ((r
= unit_load_fragment(u
, new_state
)) < 0)
583 if (*new_state
== UNIT_STUB
)
586 /* Load drop-in directory data */
587 if ((r
= unit_load_dropin(unit_follow_merge(u
))) < 0)
593 /* Common implementation for multiple backends */
594 int unit_load_fragment_and_dropin_optional(Unit
*u
, UnitLoadState
*new_state
) {
599 assert(*new_state
== UNIT_STUB
|| *new_state
== UNIT_LOADED
);
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
, new_state
)) < 0)
608 if (*new_state
== UNIT_STUB
)
609 *new_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
) {
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
.load_state
!= UNIT_STUB
)
632 if (UNIT_VTABLE(u
)->init
) {
634 if ((r
= UNIT_VTABLE(u
)->init(u
, &res
)) < 0)
638 if (res
== UNIT_STUB
) {
643 u
->meta
.load_state
= res
;
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 if (state
== UNIT_DEACTIVATING
)
717 unit_add_to_dbus_queue(u
);
718 return UNIT_VTABLE(u
)->stop(u
);
722 * -EBADR: This unit type does not support reloading.
723 * -ENOEXEC: Unit is not started.
724 * -EAGAIN: An operation is already in progress. Retry later.
726 int unit_reload(Unit
*u
) {
727 UnitActiveState state
;
731 if (!unit_can_reload(u
))
734 state
= unit_active_state(u
);
735 if (unit_active_state(u
) == UNIT_ACTIVE_RELOADING
)
738 if (unit_active_state(u
) != UNIT_ACTIVE
)
741 unit_add_to_dbus_queue(u
);
742 return UNIT_VTABLE(u
)->reload(u
);
745 bool unit_can_reload(Unit
*u
) {
748 if (!UNIT_VTABLE(u
)->reload
)
751 if (!UNIT_VTABLE(u
)->can_reload
)
754 return UNIT_VTABLE(u
)->can_reload(u
);
757 static void unit_check_uneeded(Unit
*u
) {
763 /* If this service shall be shut down when unneeded then do
766 if (!u
->meta
.stop_when_unneeded
)
769 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)))
772 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
773 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
776 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUIRED_BY
], i
)
777 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
780 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTED_BY
], i
)
781 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
784 log_debug("Service %s is not needed anymore. Stopping.", unit_id(u
));
786 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
787 manager_add_job(u
->meta
.manager
, JOB_STOP
, u
, JOB_FAIL
, true, NULL
);
790 static void retroactively_start_dependencies(Unit
*u
) {
795 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u
)));
797 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRES
], i
)
798 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
799 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
801 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_SOFT_REQUIRES
], i
)
802 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
803 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
805 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUISITE
], i
)
806 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
807 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_REPLACE
, true, NULL
);
809 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_WANTS
], i
)
810 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
811 manager_add_job(u
->meta
.manager
, JOB_START
, other
, JOB_FAIL
, false, NULL
);
813 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
814 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other
)))
815 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
818 static void retroactively_stop_dependencies(Unit
*u
) {
823 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u
)));
825 if (u
->meta
.recursive_stop
) {
826 /* Pull down units need us recursively if enabled */
827 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
828 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
829 manager_add_job(u
->meta
.manager
, JOB_STOP
, other
, JOB_REPLACE
, true, NULL
);
832 /* Garbage collect services that might not be needed anymore, if enabled */
833 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_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_SOFT_REQUIRES
], 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_WANTS
], 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_REQUISITE
], 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_SOFT_REQUISITE
], i
)
846 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other
)))
847 unit_check_uneeded(other
);
850 void unit_notify(Unit
*u
, UnitActiveState os
, UnitActiveState ns
) {
851 bool unexpected
= false;
854 assert(os
< _UNIT_ACTIVE_STATE_MAX
);
855 assert(ns
< _UNIT_ACTIVE_STATE_MAX
);
856 assert(!(os
== UNIT_ACTIVE
&& ns
== UNIT_ACTIVATING
));
857 assert(!(os
== UNIT_INACTIVE
&& ns
== UNIT_DEACTIVATING
));
859 /* Note that this is called for all low-level state changes,
860 * even if they might map to the same high-level
861 * UnitActiveState! That means that ns == os is OK an expected
862 * behaviour here. For example: if a mount point is remounted
863 * this function will be called too and the utmp code below
866 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
))
867 u
->meta
.active_enter_timestamp
= now(CLOCK_REALTIME
);
868 else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
))
869 u
->meta
.active_exit_timestamp
= now(CLOCK_REALTIME
);
873 if (u
->meta
.job
->state
== JOB_WAITING
)
875 /* So we reached a different state for this
876 * job. Let's see if we can run it now if it
877 * failed previously due to EAGAIN. */
878 job_add_to_run_queue(u
->meta
.job
);
881 assert(u
->meta
.job
->state
== JOB_RUNNING
);
883 /* Let's check whether this state change
884 * constitutes a finished job, or maybe
885 * cotradicts a running job and hence needs to
886 * invalidate jobs. */
888 switch (u
->meta
.job
->type
) {
891 case JOB_VERIFY_ACTIVE
:
893 if (UNIT_IS_ACTIVE_OR_RELOADING(ns
))
894 job_finish_and_invalidate(u
->meta
.job
, true);
895 else if (ns
!= UNIT_ACTIVATING
) {
897 job_finish_and_invalidate(u
->meta
.job
, false);
903 case JOB_RELOAD_OR_START
:
905 if (ns
== UNIT_ACTIVE
)
906 job_finish_and_invalidate(u
->meta
.job
, true);
907 else if (ns
!= UNIT_ACTIVATING
&& ns
!= UNIT_ACTIVE_RELOADING
) {
909 job_finish_and_invalidate(u
->meta
.job
, false);
916 case JOB_TRY_RESTART
:
918 if (ns
== UNIT_INACTIVE
)
919 job_finish_and_invalidate(u
->meta
.job
, true);
920 else if (ns
!= UNIT_DEACTIVATING
) {
922 job_finish_and_invalidate(u
->meta
.job
, false);
928 assert_not_reached("Job type unknown");
933 /* If this state change happened without being requested by a
934 * job, then let's retroactively start or stop dependencies */
937 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os
) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns
))
938 retroactively_start_dependencies(u
);
939 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os
) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns
))
940 retroactively_stop_dependencies(u
);
943 if (!UNIT_IS_ACTIVE_OR_RELOADING(os
) && UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
945 if (unit_has_name(u
, SPECIAL_DBUS_SERVICE
)) {
946 log_info("D-Bus became available, trying to reconnect.");
947 /* The bus just got started, hence try to connect to it. */
948 bus_init_system(u
->meta
.manager
);
949 bus_init_api(u
->meta
.manager
);
952 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
)) {
953 /* The syslog daemon just got started, hence try to connect to it. */
954 log_info("Syslog became available, trying to reconnect.");
958 } else if (UNIT_IS_ACTIVE_OR_RELOADING(os
) && !UNIT_IS_ACTIVE_OR_RELOADING(ns
)) {
960 if (unit_has_name(u
, SPECIAL_SYSLOG_SERVICE
))
961 /* The syslog daemon just got terminated, hence try to disconnect from it. */
964 /* We don't care about D-Bus here, since we'll get an
965 * asynchronous notification for it anyway. */
968 /* Maybe we finished startup and are now ready for being
969 * stopped because unneeded? */
970 unit_check_uneeded(u
);
972 unit_add_to_dbus_queue(u
);
975 int unit_watch_fd(Unit
*u
, int fd
, uint32_t events
, Watch
*w
) {
976 struct epoll_event ev
;
981 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_FD
&& w
->fd
== fd
&& w
->data
.unit
== u
));
987 if (epoll_ctl(u
->meta
.manager
->epoll_fd
,
988 w
->type
== WATCH_INVALID
? EPOLL_CTL_ADD
: EPOLL_CTL_MOD
,
1000 void unit_unwatch_fd(Unit
*u
, Watch
*w
) {
1004 if (w
->type
== WATCH_INVALID
)
1007 assert(w
->type
== WATCH_FD
);
1008 assert(w
->data
.unit
== u
);
1009 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1012 w
->type
= WATCH_INVALID
;
1013 w
->data
.unit
= NULL
;
1016 int unit_watch_pid(Unit
*u
, pid_t pid
) {
1020 return hashmap_put(u
->meta
.manager
->watch_pids
, UINT32_TO_PTR(pid
), u
);
1023 void unit_unwatch_pid(Unit
*u
, pid_t pid
) {
1027 hashmap_remove(u
->meta
.manager
->watch_pids
, UINT32_TO_PTR(pid
));
1030 int unit_watch_timer(Unit
*u
, usec_t delay
, Watch
*w
) {
1031 struct itimerspec its
;
1037 assert(w
->type
== WATCH_INVALID
|| (w
->type
== WATCH_TIMER
&& w
->data
.unit
== u
));
1039 /* This will try to reuse the old timer if there is one */
1041 if (w
->type
== WATCH_TIMER
) {
1046 if ((fd
= timerfd_create(CLOCK_MONOTONIC
, TFD_NONBLOCK
|TFD_CLOEXEC
)) < 0)
1053 /* Set absolute time in the past, but not 0, since we
1054 * don't want to disarm the timer */
1055 its
.it_value
.tv_sec
= 0;
1056 its
.it_value
.tv_nsec
= 1;
1058 flags
= TFD_TIMER_ABSTIME
;
1060 timespec_store(&its
.it_value
, delay
);
1064 /* This will also flush the elapse counter */
1065 if (timerfd_settime(fd
, flags
, &its
, NULL
) < 0)
1068 if (w
->type
== WATCH_INVALID
) {
1069 struct epoll_event ev
;
1073 ev
.events
= EPOLLIN
;
1075 if (epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_ADD
, fd
, &ev
) < 0)
1080 w
->type
= WATCH_TIMER
;
1087 close_nointr_nofail(fd
);
1092 void unit_unwatch_timer(Unit
*u
, Watch
*w
) {
1096 if (w
->type
== WATCH_INVALID
)
1099 assert(w
->type
== WATCH_TIMER
&& w
->data
.unit
== u
);
1101 assert_se(epoll_ctl(u
->meta
.manager
->epoll_fd
, EPOLL_CTL_DEL
, w
->fd
, NULL
) >= 0);
1102 assert_se(close_nointr(w
->fd
) == 0);
1105 w
->type
= WATCH_INVALID
;
1106 w
->data
.unit
= NULL
;
1109 bool unit_job_is_applicable(Unit
*u
, JobType j
) {
1111 assert(j
>= 0 && j
< _JOB_TYPE_MAX
);
1115 case JOB_VERIFY_ACTIVE
:
1121 case JOB_TRY_RESTART
:
1122 return unit_can_start(u
);
1125 return unit_can_reload(u
);
1127 case JOB_RELOAD_OR_START
:
1128 return unit_can_reload(u
) && unit_can_start(u
);
1131 assert_not_reached("Invalid job type");
1135 int unit_add_dependency(Unit
*u
, UnitDependency d
, Unit
*other
) {
1137 static const UnitDependency inverse_table
[_UNIT_DEPENDENCY_MAX
] = {
1138 [UNIT_REQUIRES
] = UNIT_REQUIRED_BY
,
1139 [UNIT_SOFT_REQUIRES
] = UNIT_SOFT_REQUIRED_BY
,
1140 [UNIT_WANTS
] = UNIT_WANTED_BY
,
1141 [UNIT_REQUISITE
] = UNIT_REQUIRED_BY
,
1142 [UNIT_SOFT_REQUISITE
] = UNIT_SOFT_REQUIRED_BY
,
1143 [UNIT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1144 [UNIT_SOFT_REQUIRED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1145 [UNIT_WANTED_BY
] = _UNIT_DEPENDENCY_INVALID
,
1146 [UNIT_CONFLICTS
] = UNIT_CONFLICTS
,
1147 [UNIT_BEFORE
] = UNIT_AFTER
,
1148 [UNIT_AFTER
] = UNIT_BEFORE
1153 assert(d
>= 0 && d
< _UNIT_DEPENDENCY_MAX
);
1154 assert(inverse_table
[d
] != _UNIT_DEPENDENCY_INVALID
);
1157 /* We won't allow dependencies on ourselves. We will not
1158 * consider them an error however. */
1162 if ((r
= set_ensure_allocated(&u
->meta
.dependencies
[d
], trivial_hash_func
, trivial_compare_func
)) < 0)
1165 if ((r
= set_ensure_allocated(&other
->meta
.dependencies
[inverse_table
[d
]], trivial_hash_func
, trivial_compare_func
)) < 0)
1168 if ((r
= set_put(u
->meta
.dependencies
[d
], other
)) < 0)
1171 if ((r
= set_put(other
->meta
.dependencies
[inverse_table
[d
]], u
)) < 0) {
1172 set_remove(u
->meta
.dependencies
[d
], other
);
1176 unit_add_to_dbus_queue(u
);
1180 int unit_add_dependency_by_name(Unit
*u
, UnitDependency d
, const char *name
) {
1184 if ((r
= manager_load_unit(u
->meta
.manager
, name
, &other
)) < 0)
1187 if ((r
= unit_add_dependency(u
, d
, other
)) < 0)
1193 int unit_add_dependency_by_name_inverse(Unit
*u
, UnitDependency d
, const char *name
) {
1197 if ((r
= manager_load_unit(u
->meta
.manager
, name
, &other
)) < 0)
1200 if ((r
= unit_add_dependency(other
, d
, u
)) < 0)
1206 int set_unit_path(const char *p
) {
1210 /* This is mostly for debug purposes */
1212 if (path_is_absolute(p
)) {
1213 if (!(c
= strdup(p
)))
1216 if (!(cwd
= get_current_dir_name()))
1219 r
= asprintf(&c
, "%s/%s", cwd
, p
);
1226 if (setenv("SYSTEMD_UNIT_PATH", c
, 0) < 0) {
1235 char *unit_name_escape_path(const char *path
, const char *suffix
) {
1242 /* Takes a path and a suffix and prefix and makes a nice
1243 * string suitable as unit name of it, escaping all weird
1246 * / becomes ., and all chars not alloweed in a unit name get
1247 * escaped as \xFF, including \ and ., of course. This
1248 * escaping is hence reversible.
1257 if (!(r
= new(char, a
*4+b
+1)))
1260 for (f
= path
, t
= r
; *f
; f
++) {
1263 else if (*f
== '.' || *f
== '\\' || !strchr(VALID_CHARS
, *f
)) {
1266 *(t
++) = hexchar(*f
> 4);
1267 *(t
++) = hexchar(*f
);
1272 memcpy(t
, suffix
, b
+1);
1277 char *unit_dbus_path(Unit
*u
) {
1282 if (!(e
= bus_path_escape(unit_id(u
))))
1285 if (asprintf(&p
, "/org/freedesktop/systemd1/unit/%s", e
) < 0) {
1294 int unit_add_cgroup(Unit
*u
, CGroupBonding
*b
) {
1302 /* Ensure this hasn't been added yet */
1305 l
= hashmap_get(u
->meta
.manager
->cgroup_bondings
, b
->path
);
1306 LIST_PREPEND(CGroupBonding
, by_path
, l
, b
);
1308 if ((r
= hashmap_replace(u
->meta
.manager
->cgroup_bondings
, b
->path
, l
)) < 0) {
1309 LIST_REMOVE(CGroupBonding
, by_path
, l
, b
);
1313 LIST_PREPEND(CGroupBonding
, by_unit
, u
->meta
.cgroup_bondings
, b
);
1319 int unit_add_cgroup_from_text(Unit
*u
, const char *name
) {
1329 /* Detect controller name */
1330 n
= strcspn(name
, ":/");
1332 /* Only controller name, no path? No path? */
1344 /* Insist in absolute paths */
1348 if (!(controller
= strndup(name
, n
)))
1351 if (cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, controller
)) {
1356 if (!(b
= new0(CGroupBonding
, 1))) {
1361 b
->controller
= controller
;
1363 if (!(b
->path
= strdup(p
))) {
1369 b
->clean_up
= false;
1371 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1378 free(b
->controller
);
1384 int unit_add_default_cgroup(Unit
*u
) {
1390 /* Adds in the default cgroup data, if it wasn't specified yet */
1392 if (unit_get_default_cgroup(u
))
1395 if (!(b
= new0(CGroupBonding
, 1)))
1398 if (!(b
->controller
= strdup(u
->meta
.manager
->cgroup_controller
)))
1401 if (asprintf(&b
->path
, "%s/%s", u
->meta
.manager
->cgroup_hierarchy
, unit_id(u
)) < 0)
1407 if ((r
= unit_add_cgroup(u
, b
)) < 0)
1414 free(b
->controller
);
1420 CGroupBonding
* unit_get_default_cgroup(Unit
*u
) {
1423 return cgroup_bonding_find_list(u
->meta
.cgroup_bondings
, u
->meta
.manager
->cgroup_controller
);
1426 static const char* const unit_type_table
[_UNIT_TYPE_MAX
] = {
1427 [UNIT_SERVICE
] = "service",
1428 [UNIT_TIMER
] = "timer",
1429 [UNIT_SOCKET
] = "socket",
1430 [UNIT_TARGET
] = "target",
1431 [UNIT_DEVICE
] = "device",
1432 [UNIT_MOUNT
] = "mount",
1433 [UNIT_AUTOMOUNT
] = "automount",
1434 [UNIT_SNAPSHOT
] = "snapshot"
1437 DEFINE_STRING_TABLE_LOOKUP(unit_type
, UnitType
);
1439 static const char* const unit_load_state_table
[_UNIT_LOAD_STATE_MAX
] = {
1440 [UNIT_STUB
] = "stub",
1441 [UNIT_LOADED
] = "loaded",
1442 [UNIT_FAILED
] = "failed",
1443 [UNIT_MERGED
] = "merged"
1446 DEFINE_STRING_TABLE_LOOKUP(unit_load_state
, UnitLoadState
);
1448 static const char* const unit_active_state_table
[_UNIT_ACTIVE_STATE_MAX
] = {
1449 [UNIT_ACTIVE
] = "active",
1450 [UNIT_INACTIVE
] = "inactive",
1451 [UNIT_ACTIVATING
] = "activating",
1452 [UNIT_DEACTIVATING
] = "deactivating"
1455 DEFINE_STRING_TABLE_LOOKUP(unit_active_state
, UnitActiveState
);
1457 static const char* const unit_dependency_table
[_UNIT_DEPENDENCY_MAX
] = {
1458 [UNIT_REQUIRES
] = "Requires",
1459 [UNIT_SOFT_REQUIRES
] = "SoftRequires",
1460 [UNIT_WANTS
] = "Wants",
1461 [UNIT_REQUISITE
] = "Requisite",
1462 [UNIT_SOFT_REQUISITE
] = "SoftRequisite",
1463 [UNIT_REQUIRED_BY
] = "RequiredBy",
1464 [UNIT_SOFT_REQUIRED_BY
] = "SoftRequiredBy",
1465 [UNIT_WANTED_BY
] = "WantedBy",
1466 [UNIT_CONFLICTS
] = "Conflicts",
1467 [UNIT_BEFORE
] = "Before",
1468 [UNIT_AFTER
] = "After",
1471 DEFINE_STRING_TABLE_LOOKUP(unit_dependency
, UnitDependency
);
1473 static const char* const kill_mode_table
[_KILL_MODE_MAX
] = {
1474 [KILL_PROCESS
] = "process",
1475 [KILL_PROCESS_GROUP
] = "process-group",
1476 [KILL_CONTROL_GROUP
] = "control-group"
1479 DEFINE_STRING_TABLE_LOOKUP(kill_mode
, KillMode
);