]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/unit.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
unit: shorten active state enums to make systemctl output nicer
[thirdparty/systemd.git] / src / unit.c
1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
2
3 /***
4 This file is part of systemd.
5
6 Copyright 2010 Lennart Poettering
7
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.
12
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.
17
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/>.
20 ***/
21
22 #include <assert.h>
23 #include <errno.h>
24 #include <string.h>
25 #include <sys/epoll.h>
26 #include <sys/timerfd.h>
27 #include <sys/poll.h>
28 #include <stdlib.h>
29 #include <unistd.h>
30
31 #include "set.h"
32 #include "unit.h"
33 #include "macro.h"
34 #include "strv.h"
35 #include "load-fragment.h"
36 #include "load-dropin.h"
37 #include "log.h"
38 #include "unit-name.h"
39 #include "specifier.h"
40 #include "dbus-unit.h"
41 #include "special.h"
42
43 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
44 [UNIT_SERVICE] = &service_vtable,
45 [UNIT_TIMER] = &timer_vtable,
46 [UNIT_SOCKET] = &socket_vtable,
47 [UNIT_TARGET] = &target_vtable,
48 [UNIT_DEVICE] = &device_vtable,
49 [UNIT_MOUNT] = &mount_vtable,
50 [UNIT_AUTOMOUNT] = &automount_vtable,
51 [UNIT_SNAPSHOT] = &snapshot_vtable,
52 [UNIT_SWAP] = &swap_vtable,
53 [UNIT_PATH] = &path_vtable
54 };
55
56 Unit *unit_new(Manager *m) {
57 Unit *u;
58
59 assert(m);
60
61 if (!(u = new0(Unit, 1)))
62 return NULL;
63
64 if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
65 free(u);
66 return NULL;
67 }
68
69 u->meta.manager = m;
70 u->meta.type = _UNIT_TYPE_INVALID;
71 u->meta.deserialized_job = _JOB_TYPE_INVALID;
72
73 return u;
74 }
75
76 bool unit_has_name(Unit *u, const char *name) {
77 assert(u);
78 assert(name);
79
80 return !!set_get(u->meta.names, (char*) name);
81 }
82
83 int unit_add_name(Unit *u, const char *text) {
84 UnitType t;
85 char *s = NULL, *i = NULL;
86 int r;
87
88 assert(u);
89 assert(text);
90
91 if (unit_name_is_template(text)) {
92 if (!u->meta.instance)
93 return -EINVAL;
94
95 s = unit_name_replace_instance(text, u->meta.instance);
96 } else
97 s = strdup(text);
98
99 if (!s)
100 return -ENOMEM;
101
102 if (!unit_name_is_valid(s)) {
103 r = -EINVAL;
104 goto fail;
105 }
106
107 assert_se((t = unit_name_to_type(s)) >= 0);
108
109 if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
110 r = -EINVAL;
111 goto fail;
112 }
113
114 if ((r = unit_name_to_instance(s, &i)) < 0)
115 goto fail;
116
117 if (i && unit_vtable[t]->no_instances)
118 goto fail;
119
120 if (u->meta.type != _UNIT_TYPE_INVALID && !streq_ptr(u->meta.instance, i)) {
121 r = -EINVAL;
122 goto fail;
123 }
124
125 if (unit_vtable[t]->no_alias &&
126 !set_isempty(u->meta.names) &&
127 !set_get(u->meta.names, s)) {
128 r = -EEXIST;
129 goto fail;
130 }
131
132 if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
133 r = -E2BIG;
134 goto fail;
135 }
136
137 if ((r = set_put(u->meta.names, s)) < 0) {
138 if (r == -EEXIST)
139 r = 0;
140 goto fail;
141 }
142
143 if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
144 set_remove(u->meta.names, s);
145 goto fail;
146 }
147
148 if (u->meta.type == _UNIT_TYPE_INVALID) {
149
150 u->meta.type = t;
151 u->meta.id = s;
152 u->meta.instance = i;
153
154 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
155
156 if (UNIT_VTABLE(u)->init)
157 UNIT_VTABLE(u)->init(u);
158 } else
159 free(i);
160
161 unit_add_to_dbus_queue(u);
162 return 0;
163
164 fail:
165 free(s);
166 free(i);
167
168 return r;
169 }
170
171 int unit_choose_id(Unit *u, const char *name) {
172 char *s, *t = NULL;
173
174 assert(u);
175 assert(name);
176
177 if (unit_name_is_template(name)) {
178
179 if (!u->meta.instance)
180 return -EINVAL;
181
182 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
183 return -ENOMEM;
184
185 name = t;
186 }
187
188 /* Selects one of the names of this unit as the id */
189 s = set_get(u->meta.names, (char*) name);
190 free(t);
191
192 if (!s)
193 return -ENOENT;
194
195 u->meta.id = s;
196 unit_add_to_dbus_queue(u);
197
198 return 0;
199 }
200
201 int unit_set_description(Unit *u, const char *description) {
202 char *s;
203
204 assert(u);
205
206 if (!(s = strdup(description)))
207 return -ENOMEM;
208
209 free(u->meta.description);
210 u->meta.description = s;
211
212 unit_add_to_dbus_queue(u);
213 return 0;
214 }
215
216 bool unit_check_gc(Unit *u) {
217 assert(u);
218
219 if (u->meta.load_state == UNIT_STUB)
220 return true;
221
222 if (UNIT_VTABLE(u)->no_gc)
223 return true;
224
225 if (u->meta.job)
226 return true;
227
228 if (unit_active_state(u) != UNIT_INACTIVE)
229 return true;
230
231 if (UNIT_VTABLE(u)->check_gc)
232 if (UNIT_VTABLE(u)->check_gc(u))
233 return true;
234
235 return false;
236 }
237
238 void unit_add_to_load_queue(Unit *u) {
239 assert(u);
240 assert(u->meta.type != _UNIT_TYPE_INVALID);
241
242 if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
243 return;
244
245 LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
246 u->meta.in_load_queue = true;
247 }
248
249 void unit_add_to_cleanup_queue(Unit *u) {
250 assert(u);
251
252 if (u->meta.in_cleanup_queue)
253 return;
254
255 LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
256 u->meta.in_cleanup_queue = true;
257 }
258
259 void unit_add_to_gc_queue(Unit *u) {
260 assert(u);
261
262 if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
263 return;
264
265 if (unit_check_gc(u))
266 return;
267
268 LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
269 u->meta.in_gc_queue = true;
270
271 u->meta.manager->n_in_gc_queue ++;
272
273 if (u->meta.manager->gc_queue_timestamp <= 0)
274 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
275 }
276
277 void unit_add_to_dbus_queue(Unit *u) {
278 assert(u);
279 assert(u->meta.type != _UNIT_TYPE_INVALID);
280
281 if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
282 return;
283
284 if (set_isempty(u->meta.manager->subscribed)) {
285 u->meta.sent_dbus_new_signal = true;
286 return;
287 }
288
289 LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
290 u->meta.in_dbus_queue = true;
291 }
292
293 static void bidi_set_free(Unit *u, Set *s) {
294 Iterator i;
295 Unit *other;
296
297 assert(u);
298
299 /* Frees the set and makes sure we are dropped from the
300 * inverse pointers */
301
302 SET_FOREACH(other, s, i) {
303 UnitDependency d;
304
305 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
306 set_remove(other->meta.dependencies[d], u);
307
308 unit_add_to_gc_queue(other);
309 }
310
311 set_free(s);
312 }
313
314 void unit_free(Unit *u) {
315 UnitDependency d;
316 Iterator i;
317 char *t;
318
319 assert(u);
320
321 bus_unit_send_removed_signal(u);
322
323 if (u->meta.load_state != UNIT_STUB)
324 if (UNIT_VTABLE(u)->done)
325 UNIT_VTABLE(u)->done(u);
326
327 SET_FOREACH(t, u->meta.names, i)
328 hashmap_remove_value(u->meta.manager->units, t, u);
329
330 if (u->meta.job)
331 job_free(u->meta.job);
332
333 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
334 bidi_set_free(u, u->meta.dependencies[d]);
335
336 if (u->meta.type != _UNIT_TYPE_INVALID)
337 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
338
339 if (u->meta.in_load_queue)
340 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
341
342 if (u->meta.in_dbus_queue)
343 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
344
345 if (u->meta.in_cleanup_queue)
346 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
347
348 if (u->meta.in_gc_queue) {
349 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
350 u->meta.manager->n_in_gc_queue--;
351 }
352
353 cgroup_bonding_free_list(u->meta.cgroup_bondings);
354
355 free(u->meta.description);
356 free(u->meta.fragment_path);
357
358 set_free_free(u->meta.names);
359
360 free(u->meta.instance);
361
362 free(u);
363 }
364
365 UnitActiveState unit_active_state(Unit *u) {
366 assert(u);
367
368 if (u->meta.load_state == UNIT_MERGED)
369 return unit_active_state(unit_follow_merge(u));
370
371 /* After a reload it might happen that a unit is not correctly
372 * loaded but still has a process around. That's why we won't
373 * shortcut failed loading to UNIT_INACTIVE_MAINTENANCE. */
374
375 return UNIT_VTABLE(u)->active_state(u);
376 }
377
378 const char* unit_sub_state_to_string(Unit *u) {
379 assert(u);
380
381 return UNIT_VTABLE(u)->sub_state_to_string(u);
382 }
383
384 static void complete_move(Set **s, Set **other) {
385 assert(s);
386 assert(other);
387
388 if (!*other)
389 return;
390
391 if (*s)
392 set_move(*s, *other);
393 else {
394 *s = *other;
395 *other = NULL;
396 }
397 }
398
399 static void merge_names(Unit *u, Unit *other) {
400 char *t;
401 Iterator i;
402
403 assert(u);
404 assert(other);
405
406 complete_move(&u->meta.names, &other->meta.names);
407
408 set_free_free(other->meta.names);
409 other->meta.names = NULL;
410 other->meta.id = NULL;
411
412 SET_FOREACH(t, u->meta.names, i)
413 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
414 }
415
416 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
417 Iterator i;
418 Unit *back;
419 int r;
420
421 assert(u);
422 assert(other);
423 assert(d < _UNIT_DEPENDENCY_MAX);
424
425 SET_FOREACH(back, other->meta.dependencies[d], i) {
426 UnitDependency k;
427
428 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
429 if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
430
431 if (r == -EEXIST)
432 set_remove(back->meta.dependencies[k], other);
433 else
434 assert(r == -ENOENT);
435 }
436 }
437
438 complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
439
440 set_free(other->meta.dependencies[d]);
441 other->meta.dependencies[d] = NULL;
442 }
443
444 int unit_merge(Unit *u, Unit *other) {
445 UnitDependency d;
446
447 assert(u);
448 assert(other);
449 assert(u->meta.manager == other->meta.manager);
450 assert(u->meta.type != _UNIT_TYPE_INVALID);
451
452 other = unit_follow_merge(other);
453
454 if (other == u)
455 return 0;
456
457 if (u->meta.type != other->meta.type)
458 return -EINVAL;
459
460 if (!streq_ptr(u->meta.instance, other->meta.instance))
461 return -EINVAL;
462
463 if (other->meta.load_state != UNIT_STUB &&
464 other->meta.load_state != UNIT_FAILED)
465 return -EEXIST;
466
467 if (other->meta.job)
468 return -EEXIST;
469
470 if (!UNIT_IS_INACTIVE_OR_MAINTENANCE(unit_active_state(other)))
471 return -EEXIST;
472
473 /* Merge names */
474 merge_names(u, other);
475
476 /* Merge dependencies */
477 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
478 merge_dependencies(u, other, d);
479
480 other->meta.load_state = UNIT_MERGED;
481 other->meta.merged_into = u;
482
483 /* If there is still some data attached to the other node, we
484 * don't need it anymore, and can free it. */
485 if (other->meta.load_state != UNIT_STUB)
486 if (UNIT_VTABLE(other)->done)
487 UNIT_VTABLE(other)->done(other);
488
489 unit_add_to_dbus_queue(u);
490 unit_add_to_cleanup_queue(other);
491
492 return 0;
493 }
494
495 int unit_merge_by_name(Unit *u, const char *name) {
496 Unit *other;
497 int r;
498 char *s = NULL;
499
500 assert(u);
501 assert(name);
502
503 if (unit_name_is_template(name)) {
504 if (!u->meta.instance)
505 return -EINVAL;
506
507 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
508 return -ENOMEM;
509
510 name = s;
511 }
512
513 if (!(other = manager_get_unit(u->meta.manager, name)))
514 r = unit_add_name(u, name);
515 else
516 r = unit_merge(u, other);
517
518 free(s);
519 return r;
520 }
521
522 Unit* unit_follow_merge(Unit *u) {
523 assert(u);
524
525 while (u->meta.load_state == UNIT_MERGED)
526 assert_se(u = u->meta.merged_into);
527
528 return u;
529 }
530
531 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
532 int r;
533
534 assert(u);
535 assert(c);
536
537 if (c->std_output != EXEC_OUTPUT_KMSG &&
538 c->std_output != EXEC_OUTPUT_SYSLOG &&
539 c->std_error != EXEC_OUTPUT_KMSG &&
540 c->std_error != EXEC_OUTPUT_SYSLOG)
541 return 0;
542
543 /* If syslog or kernel logging is requested, make sure our own
544 * logging daemon is run first. */
545
546 if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
547 return r;
548
549 if (u->meta.manager->running_as == MANAGER_SYSTEM)
550 if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
551 return r;
552
553 return 0;
554 }
555
556 const char *unit_description(Unit *u) {
557 assert(u);
558
559 if (u->meta.description)
560 return u->meta.description;
561
562 return u->meta.id;
563 }
564
565 void unit_dump(Unit *u, FILE *f, const char *prefix) {
566 char *t;
567 UnitDependency d;
568 Iterator i;
569 char *p2;
570 const char *prefix2;
571 CGroupBonding *b;
572 char
573 timestamp1[FORMAT_TIMESTAMP_MAX],
574 timestamp2[FORMAT_TIMESTAMP_MAX],
575 timestamp3[FORMAT_TIMESTAMP_MAX],
576 timestamp4[FORMAT_TIMESTAMP_MAX];
577
578 assert(u);
579 assert(u->meta.type >= 0);
580
581 if (!prefix)
582 prefix = "";
583 p2 = strappend(prefix, "\t");
584 prefix2 = p2 ? p2 : prefix;
585
586 fprintf(f,
587 "%s-> Unit %s:\n"
588 "%s\tDescription: %s\n"
589 "%s\tInstance: %s\n"
590 "%s\tUnit Load State: %s\n"
591 "%s\tUnit Active State: %s\n"
592 "%s\tInactive Exit Timestamp: %s\n"
593 "%s\tActive Enter Timestamp: %s\n"
594 "%s\tActive Exit Timestamp: %s\n"
595 "%s\tInactive Enter Timestamp: %s\n"
596 "%s\tGC Check Good: %s\n"
597 "%s\tOnly By Dependency: %s\n",
598 prefix, u->meta.id,
599 prefix, unit_description(u),
600 prefix, strna(u->meta.instance),
601 prefix, unit_load_state_to_string(u->meta.load_state),
602 prefix, unit_active_state_to_string(unit_active_state(u)),
603 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
604 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
605 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
606 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
607 prefix, yes_no(unit_check_gc(u)),
608 prefix, yes_no(u->meta.only_by_dependency));
609
610 SET_FOREACH(t, u->meta.names, i)
611 fprintf(f, "%s\tName: %s\n", prefix, t);
612
613 if (u->meta.fragment_path)
614 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
615
616 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
617 Unit *other;
618
619 SET_FOREACH(other, u->meta.dependencies[d], i)
620 fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
621 }
622
623 if (u->meta.load_state == UNIT_LOADED) {
624 fprintf(f,
625 "%s\tRecursive Stop: %s\n"
626 "%s\tStop When Unneeded: %s\n",
627 prefix, yes_no(u->meta.recursive_stop),
628 prefix, yes_no(u->meta.stop_when_unneeded));
629
630 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
631 fprintf(f, "%s\tControlGroup: %s:%s\n",
632 prefix, b->controller, b->path);
633
634 if (UNIT_VTABLE(u)->dump)
635 UNIT_VTABLE(u)->dump(u, f, prefix2);
636
637 } else if (u->meta.load_state == UNIT_MERGED)
638 fprintf(f,
639 "%s\tMerged into: %s\n",
640 prefix, u->meta.merged_into->meta.id);
641
642 if (u->meta.job)
643 job_dump(u->meta.job, f, prefix2);
644
645 free(p2);
646 }
647
648 /* Common implementation for multiple backends */
649 int unit_load_fragment_and_dropin(Unit *u) {
650 int r;
651
652 assert(u);
653
654 /* Load a .service file */
655 if ((r = unit_load_fragment(u)) < 0)
656 return r;
657
658 if (u->meta.load_state == UNIT_STUB)
659 return -ENOENT;
660
661 /* Load drop-in directory data */
662 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
663 return r;
664
665 return 0;
666 }
667
668 /* Common implementation for multiple backends */
669 int unit_load_fragment_and_dropin_optional(Unit *u) {
670 int r;
671
672 assert(u);
673
674 /* Same as unit_load_fragment_and_dropin(), but whether
675 * something can be loaded or not doesn't matter. */
676
677 /* Load a .service file */
678 if ((r = unit_load_fragment(u)) < 0)
679 return r;
680
681 if (u->meta.load_state == UNIT_STUB)
682 u->meta.load_state = UNIT_LOADED;
683
684 /* Load drop-in directory data */
685 if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
686 return r;
687
688 return 0;
689 }
690
691 /* Common implementation for multiple backends */
692 int unit_load_nop(Unit *u) {
693 assert(u);
694
695 if (u->meta.load_state == UNIT_STUB)
696 u->meta.load_state = UNIT_LOADED;
697
698 return 0;
699 }
700
701 int unit_load(Unit *u) {
702 int r;
703
704 assert(u);
705
706 if (u->meta.in_load_queue) {
707 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
708 u->meta.in_load_queue = false;
709 }
710
711 if (u->meta.type == _UNIT_TYPE_INVALID)
712 return -EINVAL;
713
714 if (u->meta.load_state != UNIT_STUB)
715 return 0;
716
717 if (UNIT_VTABLE(u)->load)
718 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
719 goto fail;
720
721 if (u->meta.load_state == UNIT_STUB) {
722 r = -ENOENT;
723 goto fail;
724 }
725
726 assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
727
728 unit_add_to_dbus_queue(unit_follow_merge(u));
729 unit_add_to_gc_queue(u);
730
731 return 0;
732
733 fail:
734 u->meta.load_state = UNIT_FAILED;
735 unit_add_to_dbus_queue(u);
736
737 log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
738
739 return r;
740 }
741
742 /* Errors:
743 * -EBADR: This unit type does not support starting.
744 * -EALREADY: Unit is already started.
745 * -EAGAIN: An operation is already in progress. Retry later.
746 * -ECANCELED: Too many requests for now.
747 */
748 int unit_start(Unit *u) {
749 UnitActiveState state;
750
751 assert(u);
752
753 if (u->meta.load_state != UNIT_LOADED)
754 return -EINVAL;
755
756 /* If this is already (being) started, then this will
757 * succeed. Note that this will even succeed if this unit is
758 * not startable by the user. This is relied on to detect when
759 * we need to wait for units and when waiting is finished. */
760 state = unit_active_state(u);
761 if (UNIT_IS_ACTIVE_OR_RELOADING(state))
762 return -EALREADY;
763
764 /* If it is stopped, but we cannot start it, then fail */
765 if (!UNIT_VTABLE(u)->start)
766 return -EBADR;
767
768 /* We don't suppress calls to ->start() here when we are
769 * already starting, to allow this request to be used as a
770 * "hurry up" call, for example when the unit is in some "auto
771 * restart" state where it waits for a holdoff timer to elapse
772 * before it will start again. */
773
774 unit_add_to_dbus_queue(u);
775 return UNIT_VTABLE(u)->start(u);
776 }
777
778 bool unit_can_start(Unit *u) {
779 assert(u);
780
781 return !!UNIT_VTABLE(u)->start;
782 }
783
784 /* Errors:
785 * -EBADR: This unit type does not support stopping.
786 * -EALREADY: Unit is already stopped.
787 * -EAGAIN: An operation is already in progress. Retry later.
788 */
789 int unit_stop(Unit *u) {
790 UnitActiveState state;
791
792 assert(u);
793
794 state = unit_active_state(u);
795 if (UNIT_IS_INACTIVE_OR_MAINTENANCE(state))
796 return -EALREADY;
797
798 if (!UNIT_VTABLE(u)->stop)
799 return -EBADR;
800
801 unit_add_to_dbus_queue(u);
802 return UNIT_VTABLE(u)->stop(u);
803 }
804
805 /* Errors:
806 * -EBADR: This unit type does not support reloading.
807 * -ENOEXEC: Unit is not started.
808 * -EAGAIN: An operation is already in progress. Retry later.
809 */
810 int unit_reload(Unit *u) {
811 UnitActiveState state;
812
813 assert(u);
814
815 if (u->meta.load_state != UNIT_LOADED)
816 return -EINVAL;
817
818 if (!unit_can_reload(u))
819 return -EBADR;
820
821 state = unit_active_state(u);
822 if (unit_active_state(u) == UNIT_RELOADING)
823 return -EALREADY;
824
825 if (unit_active_state(u) != UNIT_ACTIVE)
826 return -ENOEXEC;
827
828 unit_add_to_dbus_queue(u);
829 return UNIT_VTABLE(u)->reload(u);
830 }
831
832 bool unit_can_reload(Unit *u) {
833 assert(u);
834
835 if (!UNIT_VTABLE(u)->reload)
836 return false;
837
838 if (!UNIT_VTABLE(u)->can_reload)
839 return true;
840
841 return UNIT_VTABLE(u)->can_reload(u);
842 }
843
844 static void unit_check_uneeded(Unit *u) {
845 Iterator i;
846 Unit *other;
847
848 assert(u);
849
850 /* If this service shall be shut down when unneeded then do
851 * so. */
852
853 if (!u->meta.stop_when_unneeded)
854 return;
855
856 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
857 return;
858
859 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
860 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
861 return;
862
863 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
864 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
865 return;
866
867 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
868 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
869 return;
870
871 log_debug("Service %s is not needed anymore. Stopping.", u->meta.id);
872
873 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
874 manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
875 }
876
877 static void retroactively_start_dependencies(Unit *u) {
878 Iterator i;
879 Unit *other;
880
881 assert(u);
882 assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
883
884 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
885 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
886 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
887
888 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
889 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
890 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
891
892 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
893 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
894 manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL);
895
896 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
897 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
898 manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL);
899
900 SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
901 if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
902 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
903 }
904
905 static void retroactively_stop_dependencies(Unit *u) {
906 Iterator i;
907 Unit *other;
908
909 assert(u);
910 assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
911
912 if (u->meta.recursive_stop) {
913 /* Pull down units need us recursively if enabled */
914 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
915 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
916 manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
917 }
918
919 /* Garbage collect services that might not be needed anymore, if enabled */
920 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
921 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
922 unit_check_uneeded(other);
923 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
924 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
925 unit_check_uneeded(other);
926 SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
927 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
928 unit_check_uneeded(other);
929 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
930 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
931 unit_check_uneeded(other);
932 SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
933 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
934 unit_check_uneeded(other);
935 }
936
937 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
938 bool unexpected = false;
939 dual_timestamp ts;
940
941 assert(u);
942 assert(os < _UNIT_ACTIVE_STATE_MAX);
943 assert(ns < _UNIT_ACTIVE_STATE_MAX);
944
945 /* Note that this is called for all low-level state changes,
946 * even if they might map to the same high-level
947 * UnitActiveState! That means that ns == os is OK an expected
948 * behaviour here. For example: if a mount point is remounted
949 * this function will be called too and the utmp code below
950 * relies on that! */
951
952 dual_timestamp_get(&ts);
953
954 if (UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && !UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
955 u->meta.inactive_exit_timestamp = ts;
956 else if (!UNIT_IS_INACTIVE_OR_MAINTENANCE(os) && UNIT_IS_INACTIVE_OR_MAINTENANCE(ns))
957 u->meta.inactive_enter_timestamp = ts;
958
959 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
960 u->meta.active_enter_timestamp = ts;
961 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
962 u->meta.active_exit_timestamp = ts;
963
964 timer_unit_notify(u, ns);
965 path_unit_notify(u, ns);
966
967 if (u->meta.job) {
968
969 if (u->meta.job->state == JOB_WAITING)
970
971 /* So we reached a different state for this
972 * job. Let's see if we can run it now if it
973 * failed previously due to EAGAIN. */
974 job_add_to_run_queue(u->meta.job);
975
976
977 /* Let's check whether this state change constitutes a
978 * finished job, or maybe cotradicts a running job and
979 * hence needs to invalidate jobs. */
980
981 switch (u->meta.job->type) {
982
983 case JOB_START:
984 case JOB_VERIFY_ACTIVE:
985
986 if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
987 job_finish_and_invalidate(u->meta.job, true);
988 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
989 unexpected = true;
990 job_finish_and_invalidate(u->meta.job, false);
991 }
992
993 break;
994
995 case JOB_RELOAD:
996 case JOB_RELOAD_OR_START:
997
998 if (u->meta.job->state == JOB_RUNNING) {
999 if (ns == UNIT_ACTIVE)
1000 job_finish_and_invalidate(u->meta.job, true);
1001 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1002 unexpected = true;
1003 job_finish_and_invalidate(u->meta.job, false);
1004 }
1005 }
1006
1007 break;
1008
1009 case JOB_STOP:
1010 case JOB_RESTART:
1011 case JOB_TRY_RESTART:
1012
1013 if (ns == UNIT_INACTIVE)
1014 job_finish_and_invalidate(u->meta.job, true);
1015 else if (ns == UNIT_MAINTENANCE)
1016 job_finish_and_invalidate(u->meta.job, false);
1017 else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1018 unexpected = true;
1019 job_finish_and_invalidate(u->meta.job, false);
1020 }
1021
1022 break;
1023
1024 default:
1025 assert_not_reached("Job type unknown");
1026 }
1027 }
1028
1029 /* If this state change happened without being requested by a
1030 * job, then let's retroactively start or stop dependencies */
1031
1032 if (unexpected) {
1033 if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1034 retroactively_start_dependencies(u);
1035 else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1036 retroactively_stop_dependencies(u);
1037 }
1038
1039 /* Some names are special */
1040 if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1041 if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) {
1042 /* The bus just might have become available,
1043 * hence try to connect to it, if we aren't
1044 * yet connected. */
1045 bus_init(u->meta.manager);
1046 }
1047
1048 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1049 /* The syslog daemon just might have become
1050 * available, hence try to connect to it, if
1051 * we aren't yet connected. */
1052 log_open();
1053
1054 if (u->meta.type == UNIT_MOUNT)
1055 /* Another directory became available, let's
1056 * check if that is enough to write our utmp
1057 * entry. */
1058 manager_write_utmp_reboot(u->meta.manager);
1059
1060 if (u->meta.type == UNIT_TARGET)
1061 /* A target got activated, maybe this is a runlevel? */
1062 manager_write_utmp_runlevel(u->meta.manager, u);
1063
1064 } else if (!UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1065
1066 if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE))
1067 /* The syslog daemon might just have
1068 * terminated, hence try to disconnect from
1069 * it. */
1070 log_close_syslog();
1071
1072 /* We don't care about D-Bus here, since we'll get an
1073 * asynchronous notification for it anyway. */
1074 }
1075
1076 /* Maybe we finished startup and are now ready for being
1077 * stopped because unneeded? */
1078 unit_check_uneeded(u);
1079
1080 unit_add_to_dbus_queue(u);
1081 unit_add_to_gc_queue(u);
1082 }
1083
1084 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1085 struct epoll_event ev;
1086
1087 assert(u);
1088 assert(fd >= 0);
1089 assert(w);
1090 assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1091
1092 zero(ev);
1093 ev.data.ptr = w;
1094 ev.events = events;
1095
1096 if (epoll_ctl(u->meta.manager->epoll_fd,
1097 w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1098 fd,
1099 &ev) < 0)
1100 return -errno;
1101
1102 w->fd = fd;
1103 w->type = WATCH_FD;
1104 w->data.unit = u;
1105
1106 return 0;
1107 }
1108
1109 void unit_unwatch_fd(Unit *u, Watch *w) {
1110 assert(u);
1111 assert(w);
1112
1113 if (w->type == WATCH_INVALID)
1114 return;
1115
1116 assert(w->type == WATCH_FD);
1117 assert(w->data.unit == u);
1118 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1119
1120 w->fd = -1;
1121 w->type = WATCH_INVALID;
1122 w->data.unit = NULL;
1123 }
1124
1125 int unit_watch_pid(Unit *u, pid_t pid) {
1126 assert(u);
1127 assert(pid >= 1);
1128
1129 /* Watch a specific PID. We only support one unit watching
1130 * each PID for now. */
1131
1132 return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1133 }
1134
1135 void unit_unwatch_pid(Unit *u, pid_t pid) {
1136 assert(u);
1137 assert(pid >= 1);
1138
1139 hashmap_remove_value(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u);
1140 }
1141
1142 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1143 struct itimerspec its;
1144 int flags, fd;
1145 bool ours;
1146
1147 assert(u);
1148 assert(w);
1149 assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
1150
1151 /* This will try to reuse the old timer if there is one */
1152
1153 if (w->type == WATCH_TIMER) {
1154 ours = false;
1155 fd = w->fd;
1156 } else {
1157 ours = true;
1158 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1159 return -errno;
1160 }
1161
1162 zero(its);
1163
1164 if (delay <= 0) {
1165 /* Set absolute time in the past, but not 0, since we
1166 * don't want to disarm the timer */
1167 its.it_value.tv_sec = 0;
1168 its.it_value.tv_nsec = 1;
1169
1170 flags = TFD_TIMER_ABSTIME;
1171 } else {
1172 timespec_store(&its.it_value, delay);
1173 flags = 0;
1174 }
1175
1176 /* This will also flush the elapse counter */
1177 if (timerfd_settime(fd, flags, &its, NULL) < 0)
1178 goto fail;
1179
1180 if (w->type == WATCH_INVALID) {
1181 struct epoll_event ev;
1182
1183 zero(ev);
1184 ev.data.ptr = w;
1185 ev.events = EPOLLIN;
1186
1187 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1188 goto fail;
1189 }
1190
1191 w->fd = fd;
1192 w->type = WATCH_TIMER;
1193 w->data.unit = u;
1194
1195 return 0;
1196
1197 fail:
1198 if (ours)
1199 close_nointr_nofail(fd);
1200
1201 return -errno;
1202 }
1203
1204 void unit_unwatch_timer(Unit *u, Watch *w) {
1205 assert(u);
1206 assert(w);
1207
1208 if (w->type == WATCH_INVALID)
1209 return;
1210
1211 assert(w->type == WATCH_TIMER && w->data.unit == u);
1212
1213 assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1214 close_nointr_nofail(w->fd);
1215
1216 w->fd = -1;
1217 w->type = WATCH_INVALID;
1218 w->data.unit = NULL;
1219 }
1220
1221 bool unit_job_is_applicable(Unit *u, JobType j) {
1222 assert(u);
1223 assert(j >= 0 && j < _JOB_TYPE_MAX);
1224
1225 switch (j) {
1226
1227 case JOB_VERIFY_ACTIVE:
1228 case JOB_START:
1229 return true;
1230
1231 case JOB_STOP:
1232 case JOB_RESTART:
1233 case JOB_TRY_RESTART:
1234 return unit_can_start(u);
1235
1236 case JOB_RELOAD:
1237 return unit_can_reload(u);
1238
1239 case JOB_RELOAD_OR_START:
1240 return unit_can_reload(u) && unit_can_start(u);
1241
1242 default:
1243 assert_not_reached("Invalid job type");
1244 }
1245 }
1246
1247 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1248
1249 static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1250 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1251 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1252 [UNIT_WANTS] = UNIT_WANTED_BY,
1253 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1254 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1255 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1256 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1257 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1258 [UNIT_CONFLICTS] = UNIT_CONFLICTS,
1259 [UNIT_BEFORE] = UNIT_AFTER,
1260 [UNIT_AFTER] = UNIT_BEFORE,
1261 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1262 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1263 };
1264 int r, q = 0, v = 0, w = 0;
1265
1266 assert(u);
1267 assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1268 assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID);
1269 assert(other);
1270
1271 /* We won't allow dependencies on ourselves. We will not
1272 * consider them an error however. */
1273 if (u == other)
1274 return 0;
1275
1276 if (UNIT_VTABLE(u)->no_requires &&
1277 (d == UNIT_REQUIRES ||
1278 d == UNIT_REQUIRES_OVERRIDABLE ||
1279 d == UNIT_REQUISITE ||
1280 d == UNIT_REQUISITE_OVERRIDABLE)) {
1281 return -EINVAL;
1282 }
1283
1284 if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0 ||
1285 (r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1286 return r;
1287
1288 if (add_reference)
1289 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1290 (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1291 return r;
1292
1293 if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1294 return q;
1295
1296 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1297 r = v;
1298 goto fail;
1299 }
1300
1301 if (add_reference) {
1302 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1303 r = w;
1304 goto fail;
1305 }
1306
1307 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1308 goto fail;
1309 }
1310
1311 unit_add_to_dbus_queue(u);
1312 return 0;
1313
1314 fail:
1315 if (q > 0)
1316 set_remove(u->meta.dependencies[d], other);
1317
1318 if (v > 0)
1319 set_remove(other->meta.dependencies[inverse_table[d]], u);
1320
1321 if (w > 0)
1322 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1323
1324 return r;
1325 }
1326
1327 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1328 char *s;
1329
1330 assert(u);
1331 assert(name || path);
1332
1333 if (!name)
1334 name = file_name_from_path(path);
1335
1336 if (!unit_name_is_template(name)) {
1337 *p = NULL;
1338 return name;
1339 }
1340
1341 if (u->meta.instance)
1342 s = unit_name_replace_instance(name, u->meta.instance);
1343 else {
1344 char *i;
1345
1346 if (!(i = unit_name_to_prefix(u->meta.id)))
1347 return NULL;
1348
1349 s = unit_name_replace_instance(name, i);
1350 free(i);
1351 }
1352
1353 if (!s)
1354 return NULL;
1355
1356 *p = s;
1357 return s;
1358 }
1359
1360 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1361 Unit *other;
1362 int r;
1363 char *s;
1364
1365 assert(u);
1366 assert(name || path);
1367
1368 if (!(name = resolve_template(u, name, path, &s)))
1369 return -ENOMEM;
1370
1371 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1372 goto finish;
1373
1374 r = unit_add_dependency(u, d, other, add_reference);
1375
1376 finish:
1377 free(s);
1378 return r;
1379 }
1380
1381 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1382 Unit *other;
1383 int r;
1384 char *s;
1385
1386 assert(u);
1387 assert(name || path);
1388
1389 if (!(name = resolve_template(u, name, path, &s)))
1390 return -ENOMEM;
1391
1392 if ((r = manager_load_unit(u->meta.manager, name, path, &other)) < 0)
1393 goto finish;
1394
1395 r = unit_add_dependency(other, d, u, add_reference);
1396
1397 finish:
1398 free(s);
1399 return r;
1400 }
1401
1402 int set_unit_path(const char *p) {
1403 char *cwd, *c;
1404 int r;
1405
1406 /* This is mostly for debug purposes */
1407
1408 if (path_is_absolute(p)) {
1409 if (!(c = strdup(p)))
1410 return -ENOMEM;
1411 } else {
1412 if (!(cwd = get_current_dir_name()))
1413 return -errno;
1414
1415 r = asprintf(&c, "%s/%s", cwd, p);
1416 free(cwd);
1417
1418 if (r < 0)
1419 return -ENOMEM;
1420 }
1421
1422 if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1423 r = -errno;
1424 free(c);
1425 return r;
1426 }
1427
1428 return 0;
1429 }
1430
1431 char *unit_dbus_path(Unit *u) {
1432 char *p, *e;
1433
1434 assert(u);
1435
1436 if (!(e = bus_path_escape(u->meta.id)))
1437 return NULL;
1438
1439 if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
1440 free(e);
1441 return NULL;
1442 }
1443
1444 free(e);
1445 return p;
1446 }
1447
1448 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1449 CGroupBonding *l;
1450 int r;
1451
1452 assert(u);
1453 assert(b);
1454 assert(b->path);
1455
1456 /* Ensure this hasn't been added yet */
1457 assert(!b->unit);
1458
1459 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1460 LIST_PREPEND(CGroupBonding, by_path, l, b);
1461
1462 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1463 LIST_REMOVE(CGroupBonding, by_path, l, b);
1464 return r;
1465 }
1466
1467 LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1468 b->unit = u;
1469
1470 return 0;
1471 }
1472
1473 static char *default_cgroup_path(Unit *u) {
1474 char *p;
1475 int r;
1476
1477 assert(u);
1478
1479 if (u->meta.instance) {
1480 char *t;
1481
1482 if (!(t = unit_name_template(u->meta.id)))
1483 return NULL;
1484
1485 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1486 free(t);
1487 } else
1488 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1489
1490 return r < 0 ? NULL : p;
1491 }
1492
1493 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1494 size_t n;
1495 char *controller = NULL, *path = NULL;
1496 CGroupBonding *b = NULL;
1497 int r;
1498
1499 assert(u);
1500 assert(name);
1501
1502 /* Detect controller name */
1503 n = strcspn(name, ":");
1504
1505 if (name[n] == 0 ||
1506 (name[n] == ':' && name[n+1] == 0)) {
1507
1508 /* Only controller name, no path? */
1509
1510 if (!(path = default_cgroup_path(u)))
1511 return -ENOMEM;
1512
1513 } else {
1514 const char *p;
1515
1516 /* Controller name, and path. */
1517 p = name+n+1;
1518
1519 if (!path_is_absolute(p))
1520 return -EINVAL;
1521
1522 if (!(path = strdup(p)))
1523 return -ENOMEM;
1524 }
1525
1526 if (n > 0)
1527 controller = strndup(name, n);
1528 else
1529 controller = strdup(u->meta.manager->cgroup_controller);
1530
1531 if (!controller) {
1532 r = -ENOMEM;
1533 goto fail;
1534 }
1535
1536 if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1537 r = -EEXIST;
1538 goto fail;
1539 }
1540
1541 if (!(b = new0(CGroupBonding, 1))) {
1542 r = -ENOMEM;
1543 goto fail;
1544 }
1545
1546 b->controller = controller;
1547 b->path = path;
1548 b->only_us = false;
1549 b->clean_up = false;
1550
1551 if ((r = unit_add_cgroup(u, b)) < 0)
1552 goto fail;
1553
1554 return 0;
1555
1556 fail:
1557 free(path);
1558 free(controller);
1559 free(b);
1560
1561 return r;
1562 }
1563
1564 int unit_add_default_cgroup(Unit *u) {
1565 CGroupBonding *b;
1566 int r = -ENOMEM;
1567
1568 assert(u);
1569
1570 /* Adds in the default cgroup data, if it wasn't specified yet */
1571
1572 if (unit_get_default_cgroup(u))
1573 return 0;
1574
1575 if (!(b = new0(CGroupBonding, 1)))
1576 return -ENOMEM;
1577
1578 if (!(b->controller = strdup(u->meta.manager->cgroup_controller)))
1579 goto fail;
1580
1581 if (!(b->path = default_cgroup_path(u)))
1582 goto fail;
1583
1584 b->clean_up = true;
1585 b->only_us = true;
1586
1587 if ((r = unit_add_cgroup(u, b)) < 0)
1588 goto fail;
1589
1590 return 0;
1591
1592 fail:
1593 free(b->path);
1594 free(b->controller);
1595 free(b);
1596
1597 return r;
1598 }
1599
1600 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1601 assert(u);
1602
1603 return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller);
1604 }
1605
1606 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1607 char *t;
1608 int r;
1609
1610 assert(u);
1611 assert(type);
1612 assert(_found);
1613
1614 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1615 return -ENOMEM;
1616
1617 assert(!unit_has_name(u, t));
1618
1619 r = manager_load_unit(u->meta.manager, t, NULL, _found);
1620 free(t);
1621
1622 assert(r < 0 || *_found != u);
1623
1624 return r;
1625 }
1626
1627 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1628 Unit *found;
1629 char *t;
1630
1631 assert(u);
1632 assert(type);
1633 assert(_found);
1634
1635 if (!(t = unit_name_change_suffix(u->meta.id, type)))
1636 return -ENOMEM;
1637
1638 assert(!unit_has_name(u, t));
1639
1640 found = manager_get_unit(u->meta.manager, t);
1641 free(t);
1642
1643 if (!found)
1644 return -ENOENT;
1645
1646 *_found = found;
1647 return 0;
1648 }
1649
1650 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1651 Unit *u = userdata;
1652 assert(u);
1653
1654 return unit_name_to_prefix_and_instance(u->meta.id);
1655 }
1656
1657 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1658 Unit *u = userdata;
1659 assert(u);
1660
1661 return unit_name_to_prefix(u->meta.id);
1662 }
1663
1664 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1665 Unit *u = userdata;
1666 char *p, *r;
1667
1668 assert(u);
1669
1670 if (!(p = unit_name_to_prefix(u->meta.id)))
1671 return NULL;
1672
1673 r = unit_name_unescape(p);
1674 free(p);
1675
1676 return r;
1677 }
1678
1679 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1680 Unit *u = userdata;
1681 assert(u);
1682
1683 if (u->meta.instance)
1684 return unit_name_unescape(u->meta.instance);
1685
1686 return strdup("");
1687 }
1688
1689 char *unit_name_printf(Unit *u, const char* format) {
1690
1691 /*
1692 * This will use the passed string as format string and
1693 * replace the following specifiers:
1694 *
1695 * %n: the full id of the unit (foo@bar.waldo)
1696 * %N: the id of the unit without the suffix (foo@bar)
1697 * %p: the prefix (foo)
1698 * %i: the instance (bar)
1699 */
1700
1701 const Specifier table[] = {
1702 { 'n', specifier_string, u->meta.id },
1703 { 'N', specifier_prefix_and_instance, NULL },
1704 { 'p', specifier_prefix, NULL },
1705 { 'i', specifier_string, u->meta.instance },
1706 { 0, NULL, NULL }
1707 };
1708
1709 assert(u);
1710 assert(format);
1711
1712 return specifier_printf(format, table, u);
1713 }
1714
1715 char *unit_full_printf(Unit *u, const char *format) {
1716
1717 /* This is similar to unit_name_printf() but also supports
1718 * unescaping */
1719
1720 const Specifier table[] = {
1721 { 'n', specifier_string, u->meta.id },
1722 { 'N', specifier_prefix_and_instance, NULL },
1723 { 'p', specifier_prefix, NULL },
1724 { 'P', specifier_prefix_unescaped, NULL },
1725 { 'i', specifier_string, u->meta.instance },
1726 { 'I', specifier_instance_unescaped, NULL },
1727 { 0, NULL, NULL }
1728 };
1729
1730 assert(u);
1731 assert(format);
1732
1733 return specifier_printf(format, table, u);
1734 }
1735
1736 char **unit_full_printf_strv(Unit *u, char **l) {
1737 size_t n;
1738 char **r, **i, **j;
1739
1740 /* Applies unit_full_printf to every entry in l */
1741
1742 assert(u);
1743
1744 n = strv_length(l);
1745 if (!(r = new(char*, n+1)))
1746 return NULL;
1747
1748 for (i = l, j = r; *i; i++, j++)
1749 if (!(*j = unit_full_printf(u, *i)))
1750 goto fail;
1751
1752 *j = NULL;
1753 return r;
1754
1755 fail:
1756 j--;
1757 while (j >= r)
1758 free(*j);
1759
1760 free(r);
1761
1762 return NULL;
1763 }
1764
1765 int unit_watch_bus_name(Unit *u, const char *name) {
1766 assert(u);
1767 assert(name);
1768
1769 /* Watch a specific name on the bus. We only support one unit
1770 * watching each name for now. */
1771
1772 return hashmap_put(u->meta.manager->watch_bus, name, u);
1773 }
1774
1775 void unit_unwatch_bus_name(Unit *u, const char *name) {
1776 assert(u);
1777 assert(name);
1778
1779 hashmap_remove_value(u->meta.manager->watch_bus, name, u);
1780 }
1781
1782 bool unit_can_serialize(Unit *u) {
1783 assert(u);
1784
1785 return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
1786 }
1787
1788 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
1789 int r;
1790
1791 assert(u);
1792 assert(f);
1793 assert(fds);
1794
1795 if (!unit_can_serialize(u))
1796 return 0;
1797
1798 if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
1799 return r;
1800
1801 if (u->meta.job)
1802 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
1803
1804 /* End marker */
1805 fputc('\n', f);
1806 return 0;
1807 }
1808
1809 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
1810 va_list ap;
1811
1812 assert(u);
1813 assert(f);
1814 assert(key);
1815 assert(format);
1816
1817 fputs(key, f);
1818 fputc('=', f);
1819
1820 va_start(ap, format);
1821 vfprintf(f, format, ap);
1822 va_end(ap);
1823
1824 fputc('\n', f);
1825 }
1826
1827 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
1828 assert(u);
1829 assert(f);
1830 assert(key);
1831 assert(value);
1832
1833 fprintf(f, "%s=%s\n", key, value);
1834 }
1835
1836 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
1837 int r;
1838
1839 assert(u);
1840 assert(f);
1841 assert(fds);
1842
1843 if (!unit_can_serialize(u))
1844 return 0;
1845
1846 for (;;) {
1847 char line[1024], *l, *v;
1848 size_t k;
1849
1850 if (!fgets(line, sizeof(line), f)) {
1851 if (feof(f))
1852 return 0;
1853 return -errno;
1854 }
1855
1856 l = strstrip(line);
1857
1858 /* End marker */
1859 if (l[0] == 0)
1860 return 0;
1861
1862 k = strcspn(l, "=");
1863
1864 if (l[k] == '=') {
1865 l[k] = 0;
1866 v = l+k+1;
1867 } else
1868 v = l+k;
1869
1870 if (streq(l, "job")) {
1871 JobType type;
1872
1873 if ((type = job_type_from_string(v)) < 0)
1874 log_debug("Failed to parse job type value %s", v);
1875 else
1876 u->meta.deserialized_job = type;
1877
1878 continue;
1879 }
1880
1881 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
1882 return r;
1883 }
1884 }
1885
1886 int unit_add_node_link(Unit *u, const char *what, bool wants) {
1887 Unit *device;
1888 char *e;
1889 int r;
1890
1891 assert(u);
1892
1893 if (!what)
1894 return 0;
1895
1896 /* Adds in links to the device node that this unit is based on */
1897
1898 if (!is_device_path(what))
1899 return 0;
1900
1901 if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
1902 return -ENOMEM;
1903
1904 r = manager_load_unit(u->meta.manager, e, NULL, &device);
1905 free(e);
1906
1907 if (r < 0)
1908 return r;
1909
1910 if ((r = unit_add_dependency(u, UNIT_AFTER, device, true)) < 0)
1911 return r;
1912
1913 if ((r = unit_add_dependency(u, UNIT_REQUIRES, device, true)) < 0)
1914 return r;
1915
1916 if (wants)
1917 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
1918 return r;
1919
1920 return 0;
1921 }
1922
1923 int unit_coldplug(Unit *u) {
1924 int r;
1925
1926 assert(u);
1927
1928 if (UNIT_VTABLE(u)->coldplug)
1929 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
1930 return r;
1931
1932 if (u->meta.deserialized_job >= 0) {
1933 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_FAIL, false, NULL)) < 0)
1934 return r;
1935
1936 u->meta.deserialized_job = _JOB_TYPE_INVALID;
1937 }
1938
1939 return 0;
1940 }
1941
1942 static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
1943 [UNIT_SERVICE] = "service",
1944 [UNIT_TIMER] = "timer",
1945 [UNIT_SOCKET] = "socket",
1946 [UNIT_TARGET] = "target",
1947 [UNIT_DEVICE] = "device",
1948 [UNIT_MOUNT] = "mount",
1949 [UNIT_AUTOMOUNT] = "automount",
1950 [UNIT_SNAPSHOT] = "snapshot",
1951 [UNIT_SWAP] = "swap"
1952 };
1953
1954 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
1955
1956 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
1957 [UNIT_STUB] = "stub",
1958 [UNIT_LOADED] = "loaded",
1959 [UNIT_FAILED] = "failed",
1960 [UNIT_MERGED] = "merged"
1961 };
1962
1963 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
1964
1965 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
1966 [UNIT_ACTIVE] = "active",
1967 [UNIT_RELOADING] = "reloading",
1968 [UNIT_INACTIVE] = "inactive",
1969 [UNIT_MAINTENANCE] = "maintenance",
1970 [UNIT_ACTIVATING] = "activating",
1971 [UNIT_DEACTIVATING] = "deactivating"
1972 };
1973
1974 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
1975
1976 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
1977 [UNIT_REQUIRES] = "Requires",
1978 [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
1979 [UNIT_WANTS] = "Wants",
1980 [UNIT_REQUISITE] = "Requisite",
1981 [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
1982 [UNIT_REQUIRED_BY] = "RequiredBy",
1983 [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
1984 [UNIT_WANTED_BY] = "WantedBy",
1985 [UNIT_CONFLICTS] = "Conflicts",
1986 [UNIT_BEFORE] = "Before",
1987 [UNIT_AFTER] = "After",
1988 [UNIT_REFERENCES] = "References",
1989 [UNIT_REFERENCED_BY] = "ReferencedBy"
1990 };
1991
1992 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
1993
1994 static const char* const kill_mode_table[_KILL_MODE_MAX] = {
1995 [KILL_CONTROL_GROUP] = "control-group",
1996 [KILL_PROCESS_GROUP] = "process-group",
1997 [KILL_PROCESS] = "process",
1998 [KILL_NONE] = "none"
1999 };
2000
2001 DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);
Unnamed repository; edit this file 'description' to name the repository.