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/>.
29 #include "load-fragment.h"
30 #include "load-dropin.h"
34 Job
* job_new(Manager
*m
, JobType type
, Unit
*unit
) {
38 assert(type
< _JOB_TYPE_MAX
);
41 if (!(j
= new0(Job
, 1)))
45 j
->id
= m
->current_job_id
++;
49 /* We don't link it here, that's what job_dependency() is for */
54 void job_free(Job
*j
) {
57 /* Detach from next 'bigger' objects */
59 bus_job_send_removed_signal(j
);
61 if (j
->unit
->meta
.job
== j
) {
62 j
->unit
->meta
.job
= NULL
;
63 unit_add_to_gc_queue(j
->unit
);
66 hashmap_remove(j
->manager
->jobs
, UINT32_TO_PTR(j
->id
));
70 /* Detach from next 'smaller' objects */
71 manager_transaction_unlink_job(j
->manager
, j
, true);
74 LIST_REMOVE(Job
, run_queue
, j
->manager
->run_queue
, j
);
77 LIST_REMOVE(Job
, dbus_queue
, j
->manager
->dbus_job_queue
, j
);
82 JobDependency
* job_dependency_new(Job
*subject
, Job
*object
, bool matters
) {
87 /* Adds a new job link, which encodes that the 'subject' job
88 * needs the 'object' job in some way. If 'subject' is NULL
89 * this means the 'anchor' job (i.e. the one the user
90 * explcitily asked for) is the requester. */
92 if (!(l
= new0(JobDependency
, 1)))
100 LIST_PREPEND(JobDependency
, subject
, subject
->subject_list
, l
);
102 LIST_PREPEND(JobDependency
, subject
, object
->manager
->transaction_anchor
, l
);
104 LIST_PREPEND(JobDependency
, object
, object
->object_list
, l
);
109 void job_dependency_free(JobDependency
*l
) {
113 LIST_REMOVE(JobDependency
, subject
, l
->subject
->subject_list
, l
);
115 LIST_REMOVE(JobDependency
, subject
, l
->object
->manager
->transaction_anchor
, l
);
117 LIST_REMOVE(JobDependency
, object
, l
->object
->object_list
, l
);
122 void job_dependency_delete(Job
*subject
, Job
*object
, bool *matters
) {
127 LIST_FOREACH(object
, l
, object
->object_list
) {
128 assert(l
->object
== object
);
130 if (l
->subject
== subject
)
141 *matters
= l
->matters
;
143 job_dependency_free(l
);
146 void job_dump(Job
*j
, FILE*f
, const char *prefix
) {
154 "%s\tAction: %s -> %s\n"
158 prefix
, j
->unit
->meta
.id
, job_type_to_string(j
->type
),
159 prefix
, job_state_to_string(j
->state
),
160 prefix
, yes_no(j
->override
));
163 bool job_is_anchor(Job
*j
) {
168 LIST_FOREACH(object
, l
, j
->object_list
)
175 static bool types_match(JobType a
, JobType b
, JobType c
, JobType d
) {
177 (a
== c
&& b
== d
) ||
181 int job_type_merge(JobType
*a
, JobType b
) {
185 /* Merging is associative! a merged with b merged with c is
186 * the same as a merged with c merged with b. */
188 /* Mergeability is transitive! if a can be merged with b and b
189 * with c then a also with c */
191 /* Also, if a merged with b cannot be merged with c, then
192 * either a or b cannot be merged with c either */
194 if (types_match(*a
, b
, JOB_START
, JOB_VERIFY_ACTIVE
))
196 else if (types_match(*a
, b
, JOB_START
, JOB_RELOAD
) ||
197 types_match(*a
, b
, JOB_START
, JOB_RELOAD_OR_START
) ||
198 types_match(*a
, b
, JOB_VERIFY_ACTIVE
, JOB_RELOAD_OR_START
) ||
199 types_match(*a
, b
, JOB_RELOAD
, JOB_RELOAD_OR_START
))
200 *a
= JOB_RELOAD_OR_START
;
201 else if (types_match(*a
, b
, JOB_START
, JOB_RESTART
) ||
202 types_match(*a
, b
, JOB_START
, JOB_TRY_RESTART
) ||
203 types_match(*a
, b
, JOB_VERIFY_ACTIVE
, JOB_RESTART
) ||
204 types_match(*a
, b
, JOB_RELOAD
, JOB_RESTART
) ||
205 types_match(*a
, b
, JOB_RELOAD_OR_START
, JOB_RESTART
) ||
206 types_match(*a
, b
, JOB_RELOAD_OR_START
, JOB_TRY_RESTART
) ||
207 types_match(*a
, b
, JOB_RESTART
, JOB_TRY_RESTART
))
209 else if (types_match(*a
, b
, JOB_VERIFY_ACTIVE
, JOB_RELOAD
))
211 else if (types_match(*a
, b
, JOB_VERIFY_ACTIVE
, JOB_TRY_RESTART
) ||
212 types_match(*a
, b
, JOB_RELOAD
, JOB_TRY_RESTART
))
213 *a
= JOB_TRY_RESTART
;
220 bool job_type_is_mergeable(JobType a
, JobType b
) {
221 return job_type_merge(&a
, b
) >= 0;
224 bool job_type_is_superset(JobType a
, JobType b
) {
226 /* Checks whether operation a is a "superset" of b in its
234 return b
== JOB_VERIFY_ACTIVE
;
238 b
== JOB_VERIFY_ACTIVE
;
240 case JOB_RELOAD_OR_START
:
244 b
== JOB_VERIFY_ACTIVE
;
249 b
== JOB_VERIFY_ACTIVE
||
251 b
== JOB_RELOAD_OR_START
||
252 b
== JOB_TRY_RESTART
;
254 case JOB_TRY_RESTART
:
256 b
== JOB_VERIFY_ACTIVE
||
264 bool job_type_is_conflicting(JobType a
, JobType b
) {
265 assert(a
>= 0 && a
< _JOB_TYPE_MAX
);
266 assert(b
>= 0 && b
< _JOB_TYPE_MAX
);
268 return (a
== JOB_STOP
) != (b
== JOB_STOP
);
271 bool job_type_is_redundant(JobType a
, UnitActiveState b
) {
277 b
== UNIT_ACTIVE_RELOADING
;
283 case JOB_VERIFY_ACTIVE
:
286 b
== UNIT_ACTIVE_RELOADING
;
290 b
== UNIT_ACTIVE_RELOADING
;
292 case JOB_RELOAD_OR_START
:
294 b
== UNIT_ACTIVATING
||
295 b
== UNIT_ACTIVE_RELOADING
;
299 b
== UNIT_ACTIVATING
;
301 case JOB_TRY_RESTART
:
303 b
== UNIT_ACTIVATING
;
306 assert_not_reached("Invalid job type");
310 bool job_is_runnable(Job
*j
) {
315 assert(j
->installed
);
317 /* Checks whether there is any job running for the units this
318 * job needs to be running after (in the case of a 'positive'
319 * job type) or before (in the case of a 'negative' job type
322 if (j
->type
== JOB_START
||
323 j
->type
== JOB_VERIFY_ACTIVE
||
324 j
->type
== JOB_RELOAD
||
325 j
->type
== JOB_RELOAD_OR_START
) {
327 /* Immediate result is that the job is or might be
328 * started. In this case lets wait for the
329 * dependencies, regardless whether they are
330 * starting or stopping something. */
332 SET_FOREACH(other
, j
->unit
->meta
.dependencies
[UNIT_AFTER
], i
)
337 /* Also, if something else is being stopped and we should
338 * change state after it, then lets wait. */
340 SET_FOREACH(other
, j
->unit
->meta
.dependencies
[UNIT_BEFORE
], i
)
341 if (other
->meta
.job
&&
342 (other
->meta
.job
->type
== JOB_STOP
||
343 other
->meta
.job
->type
== JOB_RESTART
||
344 other
->meta
.job
->type
== JOB_TRY_RESTART
))
347 /* This means that for a service a and a service b where b
348 * shall be started after a:
350 * start a + start b → 1st step start a, 2nd step start b
351 * start a + stop b → 1st step stop b, 2nd step start a
352 * stop a + start b → 1st step stop a, 2nd step start b
353 * stop a + stop b → 1st step stop b, 2nd step stop a
355 * This has the side effect that restarts are properly
356 * synchronized too. */
361 int job_run_and_invalidate(Job
*j
) {
365 assert(j
->installed
);
367 if (j
->in_run_queue
) {
368 LIST_REMOVE(Job
, run_queue
, j
->manager
->run_queue
, j
);
369 j
->in_run_queue
= false;
372 if (j
->state
!= JOB_WAITING
)
375 if (!job_is_runnable(j
))
378 j
->state
= JOB_RUNNING
;
379 job_add_to_dbus_queue(j
);
384 r
= unit_start(j
->unit
);
389 case JOB_VERIFY_ACTIVE
: {
390 UnitActiveState t
= unit_active_state(j
->unit
);
391 if (UNIT_IS_ACTIVE_OR_RELOADING(t
))
393 else if (t
== UNIT_ACTIVATING
)
401 r
= unit_stop(j
->unit
);
405 r
= unit_reload(j
->unit
);
408 case JOB_RELOAD_OR_START
:
409 if (unit_active_state(j
->unit
) == UNIT_ACTIVE
)
410 r
= unit_reload(j
->unit
);
412 r
= unit_start(j
->unit
);
416 UnitActiveState t
= unit_active_state(j
->unit
);
417 if (t
== UNIT_INACTIVE
|| t
== UNIT_ACTIVATING
) {
419 r
= unit_start(j
->unit
);
421 r
= unit_stop(j
->unit
);
425 case JOB_TRY_RESTART
: {
426 UnitActiveState t
= unit_active_state(j
->unit
);
427 if (t
== UNIT_INACTIVE
|| t
== UNIT_DEACTIVATING
)
429 else if (t
== UNIT_ACTIVATING
) {
431 r
= unit_start(j
->unit
);
433 r
= unit_stop(j
->unit
);
438 assert_not_reached("Unknown job type");
442 r
= job_finish_and_invalidate(j
, true);
443 else if (r
== -EAGAIN
) {
444 j
->state
= JOB_WAITING
;
447 r
= job_finish_and_invalidate(j
, false);
452 int job_finish_and_invalidate(Job
*j
, bool success
) {
459 assert(j
->installed
);
461 log_debug("Job %s/%s finished, success=%s", j
->unit
->meta
.id
, job_type_to_string(j
->type
), yes_no(success
));
462 job_add_to_dbus_queue(j
);
464 /* Patch restart jobs so that they become normal start jobs */
465 if (success
&& (j
->type
== JOB_RESTART
|| j
->type
== JOB_TRY_RESTART
)) {
467 log_debug("Converting job %s/%s -> %s/%s",
468 j
->unit
->meta
.id
, job_type_to_string(j
->type
),
469 j
->unit
->meta
.id
, job_type_to_string(JOB_START
));
471 j
->state
= JOB_RUNNING
;
474 job_add_to_run_queue(j
);
482 /* Fail depending jobs on failure */
485 if (t
== JOB_START
||
486 t
== JOB_VERIFY_ACTIVE
||
487 t
== JOB_RELOAD_OR_START
) {
489 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY
], i
)
490 if (other
->meta
.job
&&
491 (other
->meta
.job
->type
== JOB_START
||
492 other
->meta
.job
->type
== JOB_VERIFY_ACTIVE
||
493 other
->meta
.job
->type
== JOB_RELOAD_OR_START
))
494 job_finish_and_invalidate(other
->meta
.job
, false);
496 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_REQUIRED_BY_OVERRIDABLE
], i
)
497 if (other
->meta
.job
&&
498 !other
->meta
.job
->override
&&
499 (other
->meta
.job
->type
== JOB_START
||
500 other
->meta
.job
->type
== JOB_VERIFY_ACTIVE
||
501 other
->meta
.job
->type
== JOB_RELOAD_OR_START
))
502 job_finish_and_invalidate(other
->meta
.job
, false);
504 } else if (t
== JOB_STOP
) {
506 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_CONFLICTS
], i
)
507 if (other
->meta
.job
&&
508 (other
->meta
.job
->type
== JOB_START
||
509 other
->meta
.job
->type
== JOB_VERIFY_ACTIVE
||
510 other
->meta
.job
->type
== JOB_RELOAD_OR_START
))
511 job_finish_and_invalidate(other
->meta
.job
, false);
515 /* Try to start the next jobs that can be started */
516 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_AFTER
], i
)
518 job_add_to_run_queue(other
->meta
.job
);
519 SET_FOREACH(other
, u
->meta
.dependencies
[UNIT_BEFORE
], i
)
521 job_add_to_run_queue(other
->meta
.job
);
526 void job_add_to_run_queue(Job
*j
) {
528 assert(j
->installed
);
533 LIST_PREPEND(Job
, run_queue
, j
->manager
->run_queue
, j
);
534 j
->in_run_queue
= true;
537 void job_add_to_dbus_queue(Job
*j
) {
539 assert(j
->installed
);
541 if (j
->in_dbus_queue
)
544 LIST_PREPEND(Job
, dbus_queue
, j
->manager
->dbus_job_queue
, j
);
545 j
->in_dbus_queue
= true;
548 char *job_dbus_path(Job
*j
) {
553 if (asprintf(&p
, "/org/freedesktop/systemd1/job/%lu", (unsigned long) j
->id
) < 0)
559 static const char* const job_state_table
[_JOB_STATE_MAX
] = {
560 [JOB_WAITING
] = "waiting",
561 [JOB_RUNNING
] = "running"
564 DEFINE_STRING_TABLE_LOOKUP(job_state
, JobState
);
566 static const char* const job_type_table
[_JOB_TYPE_MAX
] = {
567 [JOB_START
] = "start",
568 [JOB_VERIFY_ACTIVE
] = "verify-active",
570 [JOB_RELOAD
] = "reload",
571 [JOB_RELOAD_OR_START
] = "reload-or-start",
572 [JOB_RESTART
] = "restart",
573 [JOB_TRY_RESTART
] = "try-restart",
576 DEFINE_STRING_TABLE_LOOKUP(job_type
, JobType
);
578 static const char* const job_mode_table
[_JOB_MODE_MAX
] = {
580 [JOB_REPLACE
] = "replace",
581 [JOB_ISOLATE
] = "isolate"
584 DEFINE_STRING_TABLE_LOOKUP(job_mode
, JobMode
);