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"
33 Job* job_new(Manager *m, JobType type, Unit *unit) {
37 assert(type < _JOB_TYPE_MAX);
40 if (!(j = new0(Job, 1)))
44 j->id = m->current_job_id++;
48 /* We don't link it here, that's what job_dependency() is for */
53 void job_free(Job *j) {
56 /* Detach from next 'bigger' objects */
58 bus_job_send_removed_signal(j);
60 if (j->unit->meta.job == j)
61 j->unit->meta.job = NULL;
63 hashmap_remove(j->manager->jobs, UINT32_TO_PTR(j->id));
67 /* Detach from next 'smaller' objects */
68 manager_transaction_unlink_job(j->manager, j, true);
71 LIST_REMOVE(Job, run_queue, j->manager->run_queue, j);
74 LIST_REMOVE(Job, dbus_queue, j->manager->dbus_job_queue, j);
79 JobDependency* job_dependency_new(Job *subject, Job *object, bool matters) {
84 /* Adds a new job link, which encodes that the 'subject' job
85 * needs the 'object' job in some way. If 'subject' is NULL
86 * this means the 'anchor' job (i.e. the one the user
87 * explcitily asked for) is the requester. */
89 if (!(l = new0(JobDependency, 1)))
97 LIST_PREPEND(JobDependency, subject, subject->subject_list, l);
99 LIST_PREPEND(JobDependency, subject, object->manager->transaction_anchor, l);
101 LIST_PREPEND(JobDependency, object, object->object_list, l);
106 void job_dependency_free(JobDependency *l) {
110 LIST_REMOVE(JobDependency, subject, l->subject->subject_list, l);
112 LIST_REMOVE(JobDependency, subject, l->object->manager->transaction_anchor, l);
114 LIST_REMOVE(JobDependency, object, l->object->object_list, l);
119 void job_dependency_delete(Job *subject, Job *object, bool *matters) {
124 LIST_FOREACH(object, l, object->object_list) {
125 assert(l->object == object);
127 if (l->subject == subject)
138 *matters = l->matters;
140 job_dependency_free(l);
143 void job_dump(Job *j, FILE*f, const char *prefix) {
151 "%s\tAction: %s ā %s\n"
155 prefix, unit_id(j->unit), job_type_to_string(j->type),
156 prefix, job_state_to_string(j->state),
157 prefix, yes_no(j->forced));
160 bool job_is_anchor(Job *j) {
165 LIST_FOREACH(object, l, j->object_list)
172 static bool types_match(JobType a, JobType b, JobType c, JobType d) {
174 (a == c && b == d) ||
178 int job_type_merge(JobType *a, JobType b) {
182 /* Merging is associative! a merged with b merged with c is
183 * the same as a merged with c merged with b. */
185 /* Mergeability is transitive! if a can be merged with b and b
186 * with c then a also with c */
188 /* Also, if a merged with b cannot be merged with c, then
189 * either a or b cannot be merged with c either */
191 if (types_match(*a, b, JOB_START, JOB_VERIFY_ACTIVE))
193 else if (types_match(*a, b, JOB_START, JOB_RELOAD) ||
194 types_match(*a, b, JOB_START, JOB_RELOAD_OR_START) ||
195 types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RELOAD_OR_START) ||
196 types_match(*a, b, JOB_RELOAD, JOB_RELOAD_OR_START))
197 *a = JOB_RELOAD_OR_START;
198 else if (types_match(*a, b, JOB_START, JOB_RESTART) ||
199 types_match(*a, b, JOB_START, JOB_TRY_RESTART) ||
200 types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RESTART) ||
201 types_match(*a, b, JOB_RELOAD, JOB_RESTART) ||
202 types_match(*a, b, JOB_RELOAD_OR_START, JOB_RESTART) ||
203 types_match(*a, b, JOB_RELOAD_OR_START, JOB_TRY_RESTART) ||
204 types_match(*a, b, JOB_RESTART, JOB_TRY_RESTART))
206 else if (types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RELOAD))
208 else if (types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_TRY_RESTART) ||
209 types_match(*a, b, JOB_RELOAD, JOB_TRY_RESTART))
210 *a = JOB_TRY_RESTART;
217 bool job_type_is_mergeable(JobType a, JobType b) {
218 return job_type_merge(&a, b) >= 0;
221 bool job_type_is_superset(JobType a, JobType b) {
223 /* Checks whether operation a is a "superset" of b in its
231 return b == JOB_VERIFY_ACTIVE;
235 b == JOB_VERIFY_ACTIVE;
237 case JOB_RELOAD_OR_START:
241 b == JOB_VERIFY_ACTIVE;
246 b == JOB_VERIFY_ACTIVE ||
248 b == JOB_RELOAD_OR_START ||
249 b == JOB_TRY_RESTART;
251 case JOB_TRY_RESTART:
253 b == JOB_VERIFY_ACTIVE ||
261 bool job_type_is_conflicting(JobType a, JobType b) {
262 assert(a >= 0 && a < _JOB_TYPE_MAX);
263 assert(b >= 0 && b < _JOB_TYPE_MAX);
265 return (a == JOB_STOP) != (b == JOB_STOP);
268 bool job_type_is_redundant(JobType a, UnitActiveState b) {
274 b == UNIT_ACTIVE_RELOADING;
280 case JOB_VERIFY_ACTIVE:
283 b == UNIT_ACTIVE_RELOADING;
287 b == UNIT_ACTIVE_RELOADING;
289 case JOB_RELOAD_OR_START:
291 b == UNIT_ACTIVATING ||
292 b == UNIT_ACTIVE_RELOADING;
296 b == UNIT_ACTIVATING;
298 case JOB_TRY_RESTART:
300 b == UNIT_ACTIVATING;
303 assert_not_reached("Invalid job type");
307 bool job_is_runnable(Job *j) {
312 assert(j->installed);
314 /* Checks whether there is any job running for the units this
315 * job needs to be running after (in the case of a 'positive'
316 * job type) or before (in the case of a 'negative' job type
319 if (j->type == JOB_START ||
320 j->type == JOB_VERIFY_ACTIVE ||
321 j->type == JOB_RELOAD ||
322 j->type == JOB_RELOAD_OR_START) {
324 /* Immediate result is that the job is or might be
325 * started. In this case lets wait for the
326 * dependencies, regardless whether they are
327 * starting or stopping something. */
329 SET_FOREACH(other, j->unit->meta.dependencies[UNIT_AFTER], i)
334 /* Also, if something else is being stopped and we should
335 * change state after it, then lets wait. */
337 SET_FOREACH(other, j->unit->meta.dependencies[UNIT_BEFORE], i)
338 if (other->meta.job &&
339 (other->meta.job->type == JOB_STOP ||
340 other->meta.job->type == JOB_RESTART ||
341 other->meta.job->type == JOB_TRY_RESTART))
344 /* This means that for a service a and a service b where b
345 * shall be started after a:
347 * start a + start b ā 1st step start a, 2nd step start b
348 * start a + stop b ā 1st step stop b, 2nd step start a
349 * stop a + start b ā 1st step stop a, 2nd step start b
350 * stop a + stop b ā 1st step stop b, 2nd step stop a
352 * This has the side effect that restarts are properly
353 * synchronized too. */
358 int job_run_and_invalidate(Job *j) {
362 assert(j->installed);
364 if (j->in_run_queue) {
365 LIST_REMOVE(Job, run_queue, j->manager->run_queue, j);
366 j->in_run_queue = false;
369 if (j->state != JOB_WAITING)
372 if (!job_is_runnable(j))
375 j->state = JOB_RUNNING;
376 job_add_to_dbus_queue(j);
381 r = unit_start(j->unit);
386 case JOB_VERIFY_ACTIVE: {
387 UnitActiveState t = unit_active_state(j->unit);
388 if (UNIT_IS_ACTIVE_OR_RELOADING(t))
390 else if (t == UNIT_ACTIVATING)
398 r = unit_stop(j->unit);
402 r = unit_reload(j->unit);
405 case JOB_RELOAD_OR_START:
406 if (unit_active_state(j->unit) == UNIT_ACTIVE)
407 r = unit_reload(j->unit);
409 r = unit_start(j->unit);
413 UnitActiveState t = unit_active_state(j->unit);
414 if (t == UNIT_INACTIVE || t == UNIT_ACTIVATING) {
416 r = unit_start(j->unit);
418 r = unit_stop(j->unit);
422 case JOB_TRY_RESTART: {
423 UnitActiveState t = unit_active_state(j->unit);
424 if (t == UNIT_INACTIVE || t == UNIT_DEACTIVATING)
426 else if (t == UNIT_ACTIVATING) {
428 r = unit_start(j->unit);
430 r = unit_stop(j->unit);
435 assert_not_reached("Unknown job type");
439 r = job_finish_and_invalidate(j, true);
440 else if (r == -EAGAIN) {
441 j->state = JOB_WAITING;
444 r = job_finish_and_invalidate(j, false);
449 int job_finish_and_invalidate(Job *j, bool success) {
456 assert(j->installed);
458 log_debug("Job %s/%s finished, success=%s", unit_id(j->unit), job_type_to_string(j->type), yes_no(success));
459 job_add_to_dbus_queue(j);
461 /* Patch restart jobs so that they become normal start jobs */
462 if (success && (j->type == JOB_RESTART || j->type == JOB_TRY_RESTART)) {
464 log_debug("Converting job %s/%s ā %s/%s",
465 unit_id(j->unit), job_type_to_string(j->type),
466 unit_id(j->unit), job_type_to_string(JOB_START));
468 j->state = JOB_RUNNING;
471 job_add_to_run_queue(j);
479 /* Fail depending jobs on failure */
482 if (t == JOB_START ||
483 t == JOB_VERIFY_ACTIVE ||
484 t == JOB_RELOAD_OR_START) {
486 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
487 if (other->meta.job &&
488 (other->meta.job->type == JOB_START ||
489 other->meta.job->type == JOB_VERIFY_ACTIVE ||
490 other->meta.job->type == JOB_RELOAD_OR_START))
491 job_finish_and_invalidate(other->meta.job, false);
493 SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i)
494 if (other->meta.job &&
495 !other->meta.job->forced &&
496 (other->meta.job->type == JOB_START ||
497 other->meta.job->type == JOB_VERIFY_ACTIVE ||
498 other->meta.job->type == JOB_RELOAD_OR_START))
499 job_finish_and_invalidate(other->meta.job, false);
501 } else if (t == JOB_STOP) {
503 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
504 if (other->meta.job &&
505 (other->meta.job->type == JOB_START ||
506 other->meta.job->type == JOB_VERIFY_ACTIVE ||
507 other->meta.job->type == JOB_RELOAD_OR_START))
508 job_finish_and_invalidate(other->meta.job, false);
512 /* Try to start the next jobs that can be started */
513 SET_FOREACH(other, u->meta.dependencies[UNIT_AFTER], i)
515 job_add_to_run_queue(other->meta.job);
516 SET_FOREACH(other, u->meta.dependencies[UNIT_BEFORE], i)
518 job_add_to_run_queue(other->meta.job);
523 void job_add_to_run_queue(Job *j) {
525 assert(j->installed);
530 LIST_PREPEND(Job, run_queue, j->manager->run_queue, j);
531 j->in_run_queue = true;
534 void job_add_to_dbus_queue(Job *j) {
536 assert(j->installed);
538 if (j->in_dbus_queue)
541 LIST_PREPEND(Job, dbus_queue, j->manager->dbus_job_queue, j);
542 j->in_dbus_queue = true;
545 char *job_dbus_path(Job *j) {
550 if (asprintf(&p, "/org/freedesktop/systemd1/job/%lu", (unsigned long) j->id) < 0)
556 static const char* const job_state_table[_JOB_STATE_MAX] = {
557 [JOB_WAITING] = "waiting",
558 [JOB_RUNNING] = "running"
561 DEFINE_STRING_TABLE_LOOKUP(job_state, JobState);
563 static const char* const job_type_table[_JOB_TYPE_MAX] = {
564 [JOB_START] = "start",
565 [JOB_VERIFY_ACTIVE] = "verify-active",
567 [JOB_RELOAD] = "reload",
568 [JOB_RELOAD_OR_START] = "reload-or-start",
569 [JOB_RESTART] = "restart",
570 [JOB_TRY_RESTART] = "try-restart",
573 DEFINE_STRING_TABLE_LOOKUP(job_type, JobType);
575 static const char* const job_mode_table[_JOB_MODE_MAX] = {
577 [JOB_REPLACE] = "replace"
580 DEFINE_STRING_TABLE_LOOKUP(job_mode, JobMode);