chiark / gitweb /
unit: make ignoring in snapshots a per unit property, instead of a per unit type...
[elogind.git] / src / unit.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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 #include <sys/stat.h>
31
32 #include "set.h"
33 #include "unit.h"
34 #include "macro.h"
35 #include "strv.h"
36 #include "load-fragment.h"
37 #include "load-dropin.h"
38 #include "log.h"
39 #include "unit-name.h"
40 #include "specifier.h"
41 #include "dbus-unit.h"
42 #include "special.h"
43 #include "cgroup-util.h"
44 #include "missing.h"
45
46 const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
47         [UNIT_SERVICE] = &service_vtable,
48         [UNIT_TIMER] = &timer_vtable,
49         [UNIT_SOCKET] = &socket_vtable,
50         [UNIT_TARGET] = &target_vtable,
51         [UNIT_DEVICE] = &device_vtable,
52         [UNIT_MOUNT] = &mount_vtable,
53         [UNIT_AUTOMOUNT] = &automount_vtable,
54         [UNIT_SNAPSHOT] = &snapshot_vtable,
55         [UNIT_SWAP] = &swap_vtable,
56         [UNIT_PATH] = &path_vtable
57 };
58
59 Unit *unit_new(Manager *m) {
60         Unit *u;
61
62         assert(m);
63
64         if (!(u = new0(Unit, 1)))
65                 return NULL;
66
67         if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
68                 free(u);
69                 return NULL;
70         }
71
72         u->meta.manager = m;
73         u->meta.type = _UNIT_TYPE_INVALID;
74         u->meta.deserialized_job = _JOB_TYPE_INVALID;
75         u->meta.default_dependencies = true;
76
77         return u;
78 }
79
80 bool unit_has_name(Unit *u, const char *name) {
81         assert(u);
82         assert(name);
83
84         return !!set_get(u->meta.names, (char*) name);
85 }
86
87 int unit_add_name(Unit *u, const char *text) {
88         UnitType t;
89         char *s, *i = NULL;
90         int r;
91
92         assert(u);
93         assert(text);
94
95         if (unit_name_is_template(text)) {
96                 if (!u->meta.instance)
97                         return -EINVAL;
98
99                 s = unit_name_replace_instance(text, u->meta.instance);
100         } else
101                 s = strdup(text);
102
103         if (!s)
104                 return -ENOMEM;
105
106         if (!unit_name_is_valid(s, false)) {
107                 r = -EINVAL;
108                 goto fail;
109         }
110
111         assert_se((t = unit_name_to_type(s)) >= 0);
112
113         if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) {
114                 r = -EINVAL;
115                 goto fail;
116         }
117
118         if ((r = unit_name_to_instance(s, &i)) < 0)
119                 goto fail;
120
121         if (i && unit_vtable[t]->no_instances) {
122                 r = -EINVAL;
123                 goto fail;
124         }
125
126         /* Ensure that this unit is either instanced or not instanced,
127          * but not both. */
128         if (u->meta.type != _UNIT_TYPE_INVALID && !u->meta.instance != !i) {
129                 r = -EINVAL;
130                 goto fail;
131         }
132
133         if (unit_vtable[t]->no_alias &&
134             !set_isempty(u->meta.names) &&
135             !set_get(u->meta.names, s)) {
136                 r = -EEXIST;
137                 goto fail;
138         }
139
140         if (hashmap_size(u->meta.manager->units) >= MANAGER_MAX_NAMES) {
141                 r = -E2BIG;
142                 goto fail;
143         }
144
145         if ((r = set_put(u->meta.names, s)) < 0) {
146                 if (r == -EEXIST)
147                         r = 0;
148                 goto fail;
149         }
150
151         if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) {
152                 set_remove(u->meta.names, s);
153                 goto fail;
154         }
155
156         if (u->meta.type == _UNIT_TYPE_INVALID) {
157
158                 u->meta.type = t;
159                 u->meta.id = s;
160                 u->meta.instance = i;
161
162                 LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
163
164                 if (UNIT_VTABLE(u)->init)
165                         UNIT_VTABLE(u)->init(u);
166         } else
167                 free(i);
168
169         unit_add_to_dbus_queue(u);
170         return 0;
171
172 fail:
173         free(s);
174         free(i);
175
176         return r;
177 }
178
179 int unit_choose_id(Unit *u, const char *name) {
180         char *s, *t = NULL, *i;
181         int r;
182
183         assert(u);
184         assert(name);
185
186         if (unit_name_is_template(name)) {
187
188                 if (!u->meta.instance)
189                         return -EINVAL;
190
191                 if (!(t = unit_name_replace_instance(name, u->meta.instance)))
192                         return -ENOMEM;
193
194                 name = t;
195         }
196
197         /* Selects one of the names of this unit as the id */
198         s = set_get(u->meta.names, (char*) name);
199         free(t);
200
201         if (!s)
202                 return -ENOENT;
203
204         if ((r = unit_name_to_instance(s, &i)) < 0)
205                 return r;
206
207         u->meta.id = s;
208
209         free(u->meta.instance);
210         u->meta.instance = i;
211
212         unit_add_to_dbus_queue(u);
213
214         return 0;
215 }
216
217 int unit_set_description(Unit *u, const char *description) {
218         char *s;
219
220         assert(u);
221
222         if (!(s = strdup(description)))
223                 return -ENOMEM;
224
225         free(u->meta.description);
226         u->meta.description = s;
227
228         unit_add_to_dbus_queue(u);
229         return 0;
230 }
231
232 bool unit_check_gc(Unit *u) {
233         assert(u);
234
235         if (u->meta.load_state == UNIT_STUB)
236                 return true;
237
238         if (UNIT_VTABLE(u)->no_gc)
239                 return true;
240
241         if (u->meta.no_gc)
242                 return true;
243
244         if (u->meta.job)
245                 return true;
246
247         if (unit_active_state(u) != UNIT_INACTIVE)
248                 return true;
249
250         if (UNIT_VTABLE(u)->check_gc)
251                 if (UNIT_VTABLE(u)->check_gc(u))
252                         return true;
253
254         return false;
255 }
256
257 void unit_add_to_load_queue(Unit *u) {
258         assert(u);
259         assert(u->meta.type != _UNIT_TYPE_INVALID);
260
261         if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue)
262                 return;
263
264         LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
265         u->meta.in_load_queue = true;
266 }
267
268 void unit_add_to_cleanup_queue(Unit *u) {
269         assert(u);
270
271         if (u->meta.in_cleanup_queue)
272                 return;
273
274         LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
275         u->meta.in_cleanup_queue = true;
276 }
277
278 void unit_add_to_gc_queue(Unit *u) {
279         assert(u);
280
281         if (u->meta.in_gc_queue || u->meta.in_cleanup_queue)
282                 return;
283
284         if (unit_check_gc(u))
285                 return;
286
287         LIST_PREPEND(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
288         u->meta.in_gc_queue = true;
289
290         u->meta.manager->n_in_gc_queue ++;
291
292         if (u->meta.manager->gc_queue_timestamp <= 0)
293                 u->meta.manager->gc_queue_timestamp = now(CLOCK_MONOTONIC);
294 }
295
296 void unit_add_to_dbus_queue(Unit *u) {
297         assert(u);
298         assert(u->meta.type != _UNIT_TYPE_INVALID);
299
300         if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue)
301                 return;
302
303         /* Shortcut things if nobody cares */
304         if (!bus_has_subscriber(u->meta.manager)) {
305                 u->meta.sent_dbus_new_signal = true;
306                 return;
307         }
308
309         LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
310         u->meta.in_dbus_queue = true;
311 }
312
313 static void bidi_set_free(Unit *u, Set *s) {
314         Iterator i;
315         Unit *other;
316
317         assert(u);
318
319         /* Frees the set and makes sure we are dropped from the
320          * inverse pointers */
321
322         SET_FOREACH(other, s, i) {
323                 UnitDependency d;
324
325                 for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
326                         set_remove(other->meta.dependencies[d], u);
327
328                 unit_add_to_gc_queue(other);
329         }
330
331         set_free(s);
332 }
333
334 void unit_free(Unit *u) {
335         UnitDependency d;
336         Iterator i;
337         char *t;
338
339         assert(u);
340
341         bus_unit_send_removed_signal(u);
342
343         if (u->meta.load_state != UNIT_STUB)
344                 if (UNIT_VTABLE(u)->done)
345                         UNIT_VTABLE(u)->done(u);
346
347         SET_FOREACH(t, u->meta.names, i)
348                 hashmap_remove_value(u->meta.manager->units, t, u);
349
350         if (u->meta.job)
351                 job_free(u->meta.job);
352
353         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
354                 bidi_set_free(u, u->meta.dependencies[d]);
355
356         if (u->meta.type != _UNIT_TYPE_INVALID)
357                 LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
358
359         if (u->meta.in_load_queue)
360                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
361
362         if (u->meta.in_dbus_queue)
363                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
364
365         if (u->meta.in_cleanup_queue)
366                 LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta);
367
368         if (u->meta.in_gc_queue) {
369                 LIST_REMOVE(Meta, gc_queue, u->meta.manager->gc_queue, &u->meta);
370                 u->meta.manager->n_in_gc_queue--;
371         }
372
373         cgroup_bonding_free_list(u->meta.cgroup_bondings, u->meta.manager->n_serializing <= 0);
374
375         free(u->meta.description);
376         free(u->meta.fragment_path);
377
378         set_free_free(u->meta.names);
379
380         condition_free_list(u->meta.conditions);
381
382         free(u->meta.instance);
383         free(u);
384 }
385
386 UnitActiveState unit_active_state(Unit *u) {
387         assert(u);
388
389         if (u->meta.load_state == UNIT_MERGED)
390                 return unit_active_state(unit_follow_merge(u));
391
392         /* After a reload it might happen that a unit is not correctly
393          * loaded but still has a process around. That's why we won't
394          * shortcut failed loading to UNIT_INACTIVE_FAILED. */
395
396         return UNIT_VTABLE(u)->active_state(u);
397 }
398
399 const char* unit_sub_state_to_string(Unit *u) {
400         assert(u);
401
402         return UNIT_VTABLE(u)->sub_state_to_string(u);
403 }
404
405 static void complete_move(Set **s, Set **other) {
406         assert(s);
407         assert(other);
408
409         if (!*other)
410                 return;
411
412         if (*s)
413                 set_move(*s, *other);
414         else {
415                 *s = *other;
416                 *other = NULL;
417         }
418 }
419
420 static void merge_names(Unit *u, Unit *other) {
421         char *t;
422         Iterator i;
423
424         assert(u);
425         assert(other);
426
427         complete_move(&u->meta.names, &other->meta.names);
428
429         set_free_free(other->meta.names);
430         other->meta.names = NULL;
431         other->meta.id = NULL;
432
433         SET_FOREACH(t, u->meta.names, i)
434                 assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0);
435 }
436
437 static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) {
438         Iterator i;
439         Unit *back;
440         int r;
441
442         assert(u);
443         assert(other);
444         assert(d < _UNIT_DEPENDENCY_MAX);
445
446         /* Fix backwards pointers */
447         SET_FOREACH(back, other->meta.dependencies[d], i) {
448                 UnitDependency k;
449
450                 for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++)
451                         if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) {
452
453                                 if (r == -EEXIST)
454                                         set_remove(back->meta.dependencies[k], other);
455                                 else
456                                         assert(r == -ENOENT);
457                         }
458         }
459
460         complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]);
461
462         set_free(other->meta.dependencies[d]);
463         other->meta.dependencies[d] = NULL;
464 }
465
466 int unit_merge(Unit *u, Unit *other) {
467         UnitDependency d;
468
469         assert(u);
470         assert(other);
471         assert(u->meta.manager == other->meta.manager);
472         assert(u->meta.type != _UNIT_TYPE_INVALID);
473
474         other = unit_follow_merge(other);
475
476         if (other == u)
477                 return 0;
478
479         if (u->meta.type != other->meta.type)
480                 return -EINVAL;
481
482         if (!u->meta.instance != !other->meta.instance)
483                 return -EINVAL;
484
485         if (other->meta.load_state != UNIT_STUB &&
486             other->meta.load_state != UNIT_ERROR)
487                 return -EEXIST;
488
489         if (other->meta.job)
490                 return -EEXIST;
491
492         if (!UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(other)))
493                 return -EEXIST;
494
495         /* Merge names */
496         merge_names(u, other);
497
498         /* Merge dependencies */
499         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
500                 merge_dependencies(u, other, d);
501
502         other->meta.load_state = UNIT_MERGED;
503         other->meta.merged_into = u;
504
505         /* If there is still some data attached to the other node, we
506          * don't need it anymore, and can free it. */
507         if (other->meta.load_state != UNIT_STUB)
508                 if (UNIT_VTABLE(other)->done)
509                         UNIT_VTABLE(other)->done(other);
510
511         unit_add_to_dbus_queue(u);
512         unit_add_to_cleanup_queue(other);
513
514         return 0;
515 }
516
517 int unit_merge_by_name(Unit *u, const char *name) {
518         Unit *other;
519         int r;
520         char *s = NULL;
521
522         assert(u);
523         assert(name);
524
525         if (unit_name_is_template(name)) {
526                 if (!u->meta.instance)
527                         return -EINVAL;
528
529                 if (!(s = unit_name_replace_instance(name, u->meta.instance)))
530                         return -ENOMEM;
531
532                 name = s;
533         }
534
535         if (!(other = manager_get_unit(u->meta.manager, name)))
536                 r = unit_add_name(u, name);
537         else
538                 r = unit_merge(u, other);
539
540         free(s);
541         return r;
542 }
543
544 Unit* unit_follow_merge(Unit *u) {
545         assert(u);
546
547         while (u->meta.load_state == UNIT_MERGED)
548                 assert_se(u = u->meta.merged_into);
549
550         return u;
551 }
552
553 int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
554         int r;
555
556         assert(u);
557         assert(c);
558
559         if (c->std_output != EXEC_OUTPUT_KMSG &&
560             c->std_output != EXEC_OUTPUT_SYSLOG &&
561             c->std_output != EXEC_OUTPUT_KMSG_AND_CONSOLE &&
562             c->std_output != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
563             c->std_error != EXEC_OUTPUT_KMSG &&
564             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE &&
565             c->std_error != EXEC_OUTPUT_KMSG &&
566             c->std_error != EXEC_OUTPUT_SYSLOG_AND_CONSOLE)
567                 return 0;
568
569         /* If syslog or kernel logging is requested, make sure our own
570          * logging daemon is run first. */
571
572         if (u->meta.manager->running_as == MANAGER_SYSTEM)
573                 if ((r = unit_add_two_dependencies_by_name(u, UNIT_REQUIRES, UNIT_AFTER, SPECIAL_LOGGER_SOCKET, NULL, true)) < 0)
574                         return r;
575
576         return 0;
577 }
578
579 const char *unit_description(Unit *u) {
580         assert(u);
581
582         if (u->meta.description)
583                 return u->meta.description;
584
585         return strna(u->meta.id);
586 }
587
588 void unit_dump(Unit *u, FILE *f, const char *prefix) {
589         char *t;
590         UnitDependency d;
591         Iterator i;
592         char *p2;
593         const char *prefix2;
594         CGroupBonding *b;
595         char
596                 timestamp1[FORMAT_TIMESTAMP_MAX],
597                 timestamp2[FORMAT_TIMESTAMP_MAX],
598                 timestamp3[FORMAT_TIMESTAMP_MAX],
599                 timestamp4[FORMAT_TIMESTAMP_MAX],
600                 timespan[FORMAT_TIMESPAN_MAX];
601         Unit *following;
602
603         assert(u);
604         assert(u->meta.type >= 0);
605
606         if (!prefix)
607                 prefix = "";
608         p2 = strappend(prefix, "\t");
609         prefix2 = p2 ? p2 : prefix;
610
611         fprintf(f,
612                 "%s-> Unit %s:\n"
613                 "%s\tDescription: %s\n"
614                 "%s\tInstance: %s\n"
615                 "%s\tUnit Load State: %s\n"
616                 "%s\tUnit Active State: %s\n"
617                 "%s\tInactive Exit Timestamp: %s\n"
618                 "%s\tActive Enter Timestamp: %s\n"
619                 "%s\tActive Exit Timestamp: %s\n"
620                 "%s\tInactive Enter Timestamp: %s\n"
621                 "%s\tGC Check Good: %s\n"
622                 "%s\tNeed Daemon Reload: %s\n",
623                 prefix, u->meta.id,
624                 prefix, unit_description(u),
625                 prefix, strna(u->meta.instance),
626                 prefix, unit_load_state_to_string(u->meta.load_state),
627                 prefix, unit_active_state_to_string(unit_active_state(u)),
628                 prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.inactive_exit_timestamp.realtime)),
629                 prefix, strna(format_timestamp(timestamp2, sizeof(timestamp2), u->meta.active_enter_timestamp.realtime)),
630                 prefix, strna(format_timestamp(timestamp3, sizeof(timestamp3), u->meta.active_exit_timestamp.realtime)),
631                 prefix, strna(format_timestamp(timestamp4, sizeof(timestamp4), u->meta.inactive_enter_timestamp.realtime)),
632                 prefix, yes_no(unit_check_gc(u)),
633                 prefix, yes_no(unit_need_daemon_reload(u)));
634
635         SET_FOREACH(t, u->meta.names, i)
636                 fprintf(f, "%s\tName: %s\n", prefix, t);
637
638         if ((following = unit_following(u)))
639                 fprintf(f, "%s\tFollowing: %s\n", prefix, following->meta.id);
640
641         if (u->meta.fragment_path)
642                 fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path);
643
644         if (u->meta.job_timeout > 0)
645                 fprintf(f, "%s\tJob Timeout: %s\n", prefix, format_timespan(timespan, sizeof(timespan), u->meta.job_timeout));
646
647         condition_dump_list(u->meta.conditions, f, prefix);
648
649         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
650                 fprintf(f,
651                         "%s\tCondition Timestamp: %s\n"
652                         "%s\tCondition Result: %s\n",
653                         prefix, strna(format_timestamp(timestamp1, sizeof(timestamp1), u->meta.condition_timestamp.realtime)),
654                         prefix, yes_no(u->meta.condition_result));
655
656         for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) {
657                 Unit *other;
658
659                 SET_FOREACH(other, u->meta.dependencies[d], i)
660                         fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), other->meta.id);
661         }
662
663         if (u->meta.load_state == UNIT_LOADED) {
664                 fprintf(f,
665                         "%s\tStopWhenUnneeded: %s\n"
666                         "%s\tRefuseManualStart: %s\n"
667                         "%s\tRefuseManualStop: %s\n"
668                         "%s\tDefaultDependencies: %s\n"
669                         "%s\tOnFailureIsolate: %s\n"
670                         "%s\tIgnoreOnIsolate: %s\n"
671                         "%s\tIgnoreOnSnapshot: %s\n",
672                         prefix, yes_no(u->meta.stop_when_unneeded),
673                         prefix, yes_no(u->meta.refuse_manual_start),
674                         prefix, yes_no(u->meta.refuse_manual_stop),
675                         prefix, yes_no(u->meta.default_dependencies),
676                         prefix, yes_no(u->meta.on_failure_isolate),
677                         prefix, yes_no(u->meta.ignore_on_isolate),
678                         prefix, yes_no(u->meta.ignore_on_snapshot));
679
680                 LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings)
681                         fprintf(f, "%s\tControlGroup: %s:%s\n",
682                                 prefix, b->controller, b->path);
683
684                 if (UNIT_VTABLE(u)->dump)
685                         UNIT_VTABLE(u)->dump(u, f, prefix2);
686
687         } else if (u->meta.load_state == UNIT_MERGED)
688                 fprintf(f,
689                         "%s\tMerged into: %s\n",
690                         prefix, u->meta.merged_into->meta.id);
691         else if (u->meta.load_state == UNIT_ERROR)
692                 fprintf(f, "%s\tLoad Error Code: %s\n", prefix, strerror(-u->meta.load_error));
693
694
695         if (u->meta.job)
696                 job_dump(u->meta.job, f, prefix2);
697
698         free(p2);
699 }
700
701 /* Common implementation for multiple backends */
702 int unit_load_fragment_and_dropin(Unit *u) {
703         int r;
704
705         assert(u);
706
707         /* Load a .service file */
708         if ((r = unit_load_fragment(u)) < 0)
709                 return r;
710
711         if (u->meta.load_state == UNIT_STUB)
712                 return -ENOENT;
713
714         /* Load drop-in directory data */
715         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
716                 return r;
717
718         return 0;
719 }
720
721 /* Common implementation for multiple backends */
722 int unit_load_fragment_and_dropin_optional(Unit *u) {
723         int r;
724
725         assert(u);
726
727         /* Same as unit_load_fragment_and_dropin(), but whether
728          * something can be loaded or not doesn't matter. */
729
730         /* Load a .service file */
731         if ((r = unit_load_fragment(u)) < 0)
732                 return r;
733
734         if (u->meta.load_state == UNIT_STUB)
735                 u->meta.load_state = UNIT_LOADED;
736
737         /* Load drop-in directory data */
738         if ((r = unit_load_dropin(unit_follow_merge(u))) < 0)
739                 return r;
740
741         return 0;
742 }
743
744 int unit_add_default_target_dependency(Unit *u, Unit *target) {
745         assert(u);
746         assert(target);
747
748         if (target->meta.type != UNIT_TARGET)
749                 return 0;
750
751         /* Only add the dependency if both units are loaded, so that
752          * that loop check below is reliable */
753         if (u->meta.load_state != UNIT_LOADED ||
754             target->meta.load_state != UNIT_LOADED)
755                 return 0;
756
757         /* If either side wants no automatic dependencies, then let's
758          * skip this */
759         if (!u->meta.default_dependencies ||
760             target->meta.default_dependencies)
761                 return 0;
762
763         /* Don't create loops */
764         if (set_get(target->meta.dependencies[UNIT_BEFORE], u))
765                 return 0;
766
767         return unit_add_dependency(target, UNIT_AFTER, u, true);
768 }
769
770 static int unit_add_default_dependencies(Unit *u) {
771         static const UnitDependency deps[] = {
772                 UNIT_REQUIRED_BY,
773                 UNIT_REQUIRED_BY_OVERRIDABLE,
774                 UNIT_WANTED_BY,
775                 UNIT_BOUND_BY
776         };
777
778         Unit *target;
779         Iterator i;
780         int r;
781         unsigned k;
782
783         assert(u);
784
785         for (k = 0; k < ELEMENTSOF(deps); k++)
786                 SET_FOREACH(target, u->meta.dependencies[deps[k]], i)
787                         if ((r = unit_add_default_target_dependency(u, target)) < 0)
788                                 return r;
789
790         return 0;
791 }
792
793 int unit_load(Unit *u) {
794         int r;
795
796         assert(u);
797
798         if (u->meta.in_load_queue) {
799                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
800                 u->meta.in_load_queue = false;
801         }
802
803         if (u->meta.type == _UNIT_TYPE_INVALID)
804                 return -EINVAL;
805
806         if (u->meta.load_state != UNIT_STUB)
807                 return 0;
808
809         if (UNIT_VTABLE(u)->load)
810                 if ((r = UNIT_VTABLE(u)->load(u)) < 0)
811                         goto fail;
812
813         if (u->meta.load_state == UNIT_STUB) {
814                 r = -ENOENT;
815                 goto fail;
816         }
817
818         if (u->meta.load_state == UNIT_LOADED &&
819             u->meta.default_dependencies)
820                 if ((r = unit_add_default_dependencies(u)) < 0)
821                         goto fail;
822
823         if (u->meta.on_failure_isolate &&
824             set_size(u->meta.dependencies[UNIT_ON_FAILURE]) > 1) {
825
826                 log_error("More than one OnFailure= dependencies specified for %s but OnFailureIsolate= enabled. Refusing.",
827                           u->meta.id);
828
829                 r = -EINVAL;
830                 goto fail;
831         }
832
833         assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into);
834
835         unit_add_to_dbus_queue(unit_follow_merge(u));
836         unit_add_to_gc_queue(u);
837
838         return 0;
839
840 fail:
841         u->meta.load_state = UNIT_ERROR;
842         u->meta.load_error = r;
843         unit_add_to_dbus_queue(u);
844
845         log_debug("Failed to load configuration for %s: %s", u->meta.id, strerror(-r));
846
847         return r;
848 }
849
850 bool unit_condition_test(Unit *u) {
851         assert(u);
852
853         dual_timestamp_get(&u->meta.condition_timestamp);
854         u->meta.condition_result = condition_test_list(u->meta.conditions);
855
856         return u->meta.condition_result;
857 }
858
859 /* Errors:
860  *         -EBADR:     This unit type does not support starting.
861  *         -EALREADY:  Unit is already started.
862  *         -EAGAIN:    An operation is already in progress. Retry later.
863  *         -ECANCELED: Too many requests for now.
864  */
865 int unit_start(Unit *u) {
866         UnitActiveState state;
867         Unit *following;
868
869         assert(u);
870
871         if (u->meta.load_state != UNIT_LOADED)
872                 return -EINVAL;
873
874         /* If this is already (being) started, then this will
875          * succeed. Note that this will even succeed if this unit is
876          * not startable by the user. This is relied on to detect when
877          * we need to wait for units and when waiting is finished. */
878         state = unit_active_state(u);
879         if (UNIT_IS_ACTIVE_OR_RELOADING(state))
880                 return -EALREADY;
881
882         /* If the conditions failed, don't do anything at all */
883         if (!unit_condition_test(u)) {
884                 log_debug("Starting of %s requested but condition failed. Ignoring.", u->meta.id);
885                 return -EALREADY;
886         }
887
888         /* Forward to the main object, if we aren't it. */
889         if ((following = unit_following(u))) {
890                 log_debug("Redirecting start request from %s to %s.", u->meta.id, following->meta.id);
891                 return unit_start(following);
892         }
893
894         /* If it is stopped, but we cannot start it, then fail */
895         if (!UNIT_VTABLE(u)->start)
896                 return -EBADR;
897
898         /* We don't suppress calls to ->start() here when we are
899          * already starting, to allow this request to be used as a
900          * "hurry up" call, for example when the unit is in some "auto
901          * restart" state where it waits for a holdoff timer to elapse
902          * before it will start again. */
903
904         unit_add_to_dbus_queue(u);
905
906         unit_status_printf(u, "Starting %s...\n", unit_description(u));
907         return UNIT_VTABLE(u)->start(u);
908 }
909
910 bool unit_can_start(Unit *u) {
911         assert(u);
912
913         return !!UNIT_VTABLE(u)->start;
914 }
915
916 bool unit_can_isolate(Unit *u) {
917         assert(u);
918
919         return unit_can_start(u) &&
920                 u->meta.allow_isolate;
921 }
922
923 /* Errors:
924  *         -EBADR:    This unit type does not support stopping.
925  *         -EALREADY: Unit is already stopped.
926  *         -EAGAIN:   An operation is already in progress. Retry later.
927  */
928 int unit_stop(Unit *u) {
929         UnitActiveState state;
930         Unit *following;
931
932         assert(u);
933
934         state = unit_active_state(u);
935         if (UNIT_IS_INACTIVE_OR_FAILED(state))
936                 return -EALREADY;
937
938         if ((following = unit_following(u))) {
939                 log_debug("Redirecting stop request from %s to %s.", u->meta.id, following->meta.id);
940                 return unit_stop(following);
941         }
942
943         if (!UNIT_VTABLE(u)->stop)
944                 return -EBADR;
945
946         unit_add_to_dbus_queue(u);
947
948         unit_status_printf(u, "Stopping %s...\n", unit_description(u));
949         return UNIT_VTABLE(u)->stop(u);
950 }
951
952 /* Errors:
953  *         -EBADR:    This unit type does not support reloading.
954  *         -ENOEXEC:  Unit is not started.
955  *         -EAGAIN:   An operation is already in progress. Retry later.
956  */
957 int unit_reload(Unit *u) {
958         UnitActiveState state;
959         Unit *following;
960
961         assert(u);
962
963         if (u->meta.load_state != UNIT_LOADED)
964                 return -EINVAL;
965
966         if (!unit_can_reload(u))
967                 return -EBADR;
968
969         state = unit_active_state(u);
970         if (state == UNIT_RELOADING)
971                 return -EALREADY;
972
973         if (state != UNIT_ACTIVE)
974                 return -ENOEXEC;
975
976         if ((following = unit_following(u))) {
977                 log_debug("Redirecting reload request from %s to %s.", u->meta.id, following->meta.id);
978                 return unit_reload(following);
979         }
980
981         unit_add_to_dbus_queue(u);
982         return UNIT_VTABLE(u)->reload(u);
983 }
984
985 bool unit_can_reload(Unit *u) {
986         assert(u);
987
988         if (!UNIT_VTABLE(u)->reload)
989                 return false;
990
991         if (!UNIT_VTABLE(u)->can_reload)
992                 return true;
993
994         return UNIT_VTABLE(u)->can_reload(u);
995 }
996
997 static void unit_check_unneeded(Unit *u) {
998         Iterator i;
999         Unit *other;
1000
1001         assert(u);
1002
1003         /* If this service shall be shut down when unneeded then do
1004          * so. */
1005
1006         if (!u->meta.stop_when_unneeded)
1007                 return;
1008
1009         if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
1010                 return;
1011
1012         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
1013                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1014                         return;
1015
1016         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY_OVERRIDABLE], i)
1017                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1018                         return;
1019
1020         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
1021                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1022                         return;
1023
1024         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1025                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1026                         return;
1027
1028         log_info("Service %s is not needed anymore. Stopping.", u->meta.id);
1029
1030         /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1031         manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL, NULL);
1032 }
1033
1034 static void retroactively_start_dependencies(Unit *u) {
1035         Iterator i;
1036         Unit *other;
1037
1038         assert(u);
1039         assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)));
1040
1041         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1042                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1043                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1044                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1045
1046         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1047                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1048                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1049                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1050
1051         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1052                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1053                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1054                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1055
1056         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1057                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1058                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1059                         manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL, NULL);
1060
1061         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1062                 if (!set_get(u->meta.dependencies[UNIT_AFTER], other) &&
1063                     !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other)))
1064                         manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL, NULL);
1065
1066         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
1067                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1068                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1069
1070         SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTED_BY], i)
1071                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1072                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1073 }
1074
1075 static void retroactively_stop_dependencies(Unit *u) {
1076         Iterator i;
1077         Unit *other;
1078
1079         assert(u);
1080         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
1081
1082         /* Pull down units which are bound to us recursively if enabled */
1083         SET_FOREACH(other, u->meta.dependencies[UNIT_BOUND_BY], i)
1084                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1085                         manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL, NULL);
1086
1087         /* Garbage collect services that might not be needed anymore, if enabled */
1088         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
1089                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1090                         unit_check_unneeded(other);
1091         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES_OVERRIDABLE], i)
1092                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1093                         unit_check_unneeded(other);
1094         SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
1095                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1096                         unit_check_unneeded(other);
1097         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
1098                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1099                         unit_check_unneeded(other);
1100         SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE_OVERRIDABLE], i)
1101                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1102                         unit_check_unneeded(other);
1103         SET_FOREACH(other, u->meta.dependencies[UNIT_BIND_TO], i)
1104                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
1105                         unit_check_unneeded(other);
1106 }
1107
1108 void unit_trigger_on_failure(Unit *u) {
1109         Unit *other;
1110         Iterator i;
1111
1112         assert(u);
1113
1114         if (set_size(u->meta.dependencies[UNIT_ON_FAILURE]) <= 0)
1115                 return;
1116
1117         log_info("Triggering OnFailure= dependencies of %s.", u->meta.id);
1118
1119         SET_FOREACH(other, u->meta.dependencies[UNIT_ON_FAILURE], i) {
1120                 int r;
1121
1122                 if ((r = manager_add_job(u->meta.manager, JOB_START, other, u->meta.on_failure_isolate ? JOB_ISOLATE : JOB_REPLACE, true, NULL, NULL)) < 0)
1123                         log_error("Failed to enqueue OnFailure= job: %s", strerror(-r));
1124         }
1125 }
1126
1127 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns, bool reload_success) {
1128         bool unexpected;
1129
1130         assert(u);
1131         assert(os < _UNIT_ACTIVE_STATE_MAX);
1132         assert(ns < _UNIT_ACTIVE_STATE_MAX);
1133
1134         /* Note that this is called for all low-level state changes,
1135          * even if they might map to the same high-level
1136          * UnitActiveState! That means that ns == os is OK an expected
1137          * behaviour here. For example: if a mount point is remounted
1138          * this function will be called too! */
1139
1140         if (u->meta.manager->n_deserializing <= 0) {
1141                 dual_timestamp ts;
1142
1143                 dual_timestamp_get(&ts);
1144
1145                 if (UNIT_IS_INACTIVE_OR_FAILED(os) && !UNIT_IS_INACTIVE_OR_FAILED(ns))
1146                         u->meta.inactive_exit_timestamp = ts;
1147                 else if (!UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_INACTIVE_OR_FAILED(ns))
1148                         u->meta.inactive_enter_timestamp = ts;
1149
1150                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns))
1151                         u->meta.active_enter_timestamp = ts;
1152                 else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns))
1153                         u->meta.active_exit_timestamp = ts;
1154
1155                 timer_unit_notify(u, ns);
1156                 path_unit_notify(u, ns);
1157         }
1158
1159         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1160                 cgroup_bonding_trim_list(u->meta.cgroup_bondings, true);
1161
1162         if (u->meta.job) {
1163                 unexpected = false;
1164
1165                 if (u->meta.job->state == JOB_WAITING)
1166
1167                         /* So we reached a different state for this
1168                          * job. Let's see if we can run it now if it
1169                          * failed previously due to EAGAIN. */
1170                         job_add_to_run_queue(u->meta.job);
1171
1172                 /* Let's check whether this state change constitutes a
1173                  * finished job, or maybe contradicts a running job and
1174                  * hence needs to invalidate jobs. */
1175
1176                 switch (u->meta.job->type) {
1177
1178                 case JOB_START:
1179                 case JOB_VERIFY_ACTIVE:
1180
1181                         if (UNIT_IS_ACTIVE_OR_RELOADING(ns))
1182                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1183                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_ACTIVATING) {
1184                                 unexpected = true;
1185
1186                                 if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1187                                         job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1188                         }
1189
1190                         break;
1191
1192                 case JOB_RELOAD:
1193                 case JOB_RELOAD_OR_START:
1194
1195                         if (u->meta.job->state == JOB_RUNNING) {
1196                                 if (ns == UNIT_ACTIVE)
1197                                         job_finish_and_invalidate(u->meta.job, reload_success ? JOB_DONE : JOB_FAILED);
1198                                 else if (ns != UNIT_ACTIVATING && ns != UNIT_RELOADING) {
1199                                         unexpected = true;
1200
1201                                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1202                                                 job_finish_and_invalidate(u->meta.job, ns == UNIT_FAILED ? JOB_FAILED : JOB_DONE);
1203                                 }
1204                         }
1205
1206                         break;
1207
1208                 case JOB_STOP:
1209                 case JOB_RESTART:
1210                 case JOB_TRY_RESTART:
1211
1212                         if (UNIT_IS_INACTIVE_OR_FAILED(ns))
1213                                 job_finish_and_invalidate(u->meta.job, JOB_DONE);
1214                         else if (u->meta.job->state == JOB_RUNNING && ns != UNIT_DEACTIVATING) {
1215                                 unexpected = true;
1216                                 job_finish_and_invalidate(u->meta.job, JOB_FAILED);
1217                         }
1218
1219                         break;
1220
1221                 default:
1222                         assert_not_reached("Job type unknown");
1223                 }
1224
1225         } else
1226                 unexpected = true;
1227
1228         if (u->meta.manager->n_deserializing <= 0) {
1229
1230                 /* If this state change happened without being
1231                  * requested by a job, then let's retroactively start
1232                  * or stop dependencies. We skip that step when
1233                  * deserializing, since we don't want to create any
1234                  * additional jobs just because something is already
1235                  * activated. */
1236
1237                 if (unexpected) {
1238                         if (UNIT_IS_INACTIVE_OR_FAILED(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns))
1239                                 retroactively_start_dependencies(u);
1240                         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
1241                                 retroactively_stop_dependencies(u);
1242                 }
1243
1244                 if (ns != os && ns == UNIT_FAILED) {
1245                         log_notice("Unit %s entered failed state.", u->meta.id);
1246                         unit_trigger_on_failure(u);
1247                 }
1248         }
1249
1250         /* Some names are special */
1251         if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) {
1252
1253                 if (unit_has_name(u, SPECIAL_DBUS_SERVICE))
1254                         /* The bus just might have become available,
1255                          * hence try to connect to it, if we aren't
1256                          * yet connected. */
1257                         bus_init(u->meta.manager, true);
1258
1259                 if (u->meta.type == UNIT_SERVICE &&
1260                     !UNIT_IS_ACTIVE_OR_RELOADING(os) &&
1261                     u->meta.manager->n_deserializing <= 0) {
1262                         /* Write audit record if we have just finished starting up */
1263                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, true);
1264                         u->meta.in_audit = true;
1265                 }
1266
1267                 if (!UNIT_IS_ACTIVE_OR_RELOADING(os))
1268                         manager_send_unit_plymouth(u->meta.manager, u);
1269
1270         } else {
1271
1272                 /* We don't care about D-Bus here, since we'll get an
1273                  * asynchronous notification for it anyway. */
1274
1275                 if (u->meta.type == UNIT_SERVICE &&
1276                     UNIT_IS_INACTIVE_OR_FAILED(ns) &&
1277                     !UNIT_IS_INACTIVE_OR_FAILED(os) &&
1278                     u->meta.manager->n_deserializing <= 0) {
1279
1280                         /* Hmm, if there was no start record written
1281                          * write it now, so that we always have a nice
1282                          * pair */
1283                         if (!u->meta.in_audit) {
1284                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_START, ns == UNIT_INACTIVE);
1285
1286                                 if (ns == UNIT_INACTIVE)
1287                                         manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, true);
1288                         } else
1289                                 /* Write audit record if we have just finished shutting down */
1290                                 manager_send_unit_audit(u->meta.manager, u, AUDIT_SERVICE_STOP, ns == UNIT_INACTIVE);
1291
1292                         u->meta.in_audit = false;
1293                 }
1294         }
1295
1296         manager_recheck_syslog(u->meta.manager);
1297
1298         /* Maybe we finished startup and are now ready for being
1299          * stopped because unneeded? */
1300         unit_check_unneeded(u);
1301
1302         unit_add_to_dbus_queue(u);
1303         unit_add_to_gc_queue(u);
1304 }
1305
1306 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
1307         struct epoll_event ev;
1308
1309         assert(u);
1310         assert(fd >= 0);
1311         assert(w);
1312         assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
1313
1314         zero(ev);
1315         ev.data.ptr = w;
1316         ev.events = events;
1317
1318         if (epoll_ctl(u->meta.manager->epoll_fd,
1319                       w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD,
1320                       fd,
1321                       &ev) < 0)
1322                 return -errno;
1323
1324         w->fd = fd;
1325         w->type = WATCH_FD;
1326         w->data.unit = u;
1327
1328         return 0;
1329 }
1330
1331 void unit_unwatch_fd(Unit *u, Watch *w) {
1332         assert(u);
1333         assert(w);
1334
1335         if (w->type == WATCH_INVALID)
1336                 return;
1337
1338         assert(w->type == WATCH_FD);
1339         assert(w->data.unit == u);
1340         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1341
1342         w->fd = -1;
1343         w->type = WATCH_INVALID;
1344         w->data.unit = NULL;
1345 }
1346
1347 int unit_watch_pid(Unit *u, pid_t pid) {
1348         assert(u);
1349         assert(pid >= 1);
1350
1351         /* Watch a specific PID. We only support one unit watching
1352          * each PID for now. */
1353
1354         return hashmap_put(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1355 }
1356
1357 void unit_unwatch_pid(Unit *u, pid_t pid) {
1358         assert(u);
1359         assert(pid >= 1);
1360
1361         hashmap_remove_value(u->meta.manager->watch_pids, LONG_TO_PTR(pid), u);
1362 }
1363
1364 int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
1365         struct itimerspec its;
1366         int flags, fd;
1367         bool ours;
1368
1369         assert(u);
1370         assert(w);
1371         assert(w->type == WATCH_INVALID || (w->type == WATCH_UNIT_TIMER && w->data.unit == u));
1372
1373         /* This will try to reuse the old timer if there is one */
1374
1375         if (w->type == WATCH_UNIT_TIMER) {
1376                 assert(w->data.unit == u);
1377                 assert(w->fd >= 0);
1378
1379                 ours = false;
1380                 fd = w->fd;
1381         } else if (w->type == WATCH_INVALID) {
1382
1383                 ours = true;
1384                 if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
1385                         return -errno;
1386         } else
1387                 assert_not_reached("Invalid watch type");
1388
1389         zero(its);
1390
1391         if (delay <= 0) {
1392                 /* Set absolute time in the past, but not 0, since we
1393                  * don't want to disarm the timer */
1394                 its.it_value.tv_sec = 0;
1395                 its.it_value.tv_nsec = 1;
1396
1397                 flags = TFD_TIMER_ABSTIME;
1398         } else {
1399                 timespec_store(&its.it_value, delay);
1400                 flags = 0;
1401         }
1402
1403         /* This will also flush the elapse counter */
1404         if (timerfd_settime(fd, flags, &its, NULL) < 0)
1405                 goto fail;
1406
1407         if (w->type == WATCH_INVALID) {
1408                 struct epoll_event ev;
1409
1410                 zero(ev);
1411                 ev.data.ptr = w;
1412                 ev.events = EPOLLIN;
1413
1414                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
1415                         goto fail;
1416         }
1417
1418         w->type = WATCH_UNIT_TIMER;
1419         w->fd = fd;
1420         w->data.unit = u;
1421
1422         return 0;
1423
1424 fail:
1425         if (ours)
1426                 close_nointr_nofail(fd);
1427
1428         return -errno;
1429 }
1430
1431 void unit_unwatch_timer(Unit *u, Watch *w) {
1432         assert(u);
1433         assert(w);
1434
1435         if (w->type == WATCH_INVALID)
1436                 return;
1437
1438         assert(w->type == WATCH_UNIT_TIMER);
1439         assert(w->data.unit == u);
1440         assert(w->fd >= 0);
1441
1442         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
1443         close_nointr_nofail(w->fd);
1444
1445         w->fd = -1;
1446         w->type = WATCH_INVALID;
1447         w->data.unit = NULL;
1448 }
1449
1450 bool unit_job_is_applicable(Unit *u, JobType j) {
1451         assert(u);
1452         assert(j >= 0 && j < _JOB_TYPE_MAX);
1453
1454         switch (j) {
1455
1456         case JOB_VERIFY_ACTIVE:
1457         case JOB_START:
1458         case JOB_STOP:
1459                 return true;
1460
1461         case JOB_RESTART:
1462         case JOB_TRY_RESTART:
1463                 return unit_can_start(u);
1464
1465         case JOB_RELOAD:
1466                 return unit_can_reload(u);
1467
1468         case JOB_RELOAD_OR_START:
1469                 return unit_can_reload(u) && unit_can_start(u);
1470
1471         default:
1472                 assert_not_reached("Invalid job type");
1473         }
1474 }
1475
1476 int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference) {
1477
1478         static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = {
1479                 [UNIT_REQUIRES] = UNIT_REQUIRED_BY,
1480                 [UNIT_REQUIRES_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1481                 [UNIT_WANTS] = UNIT_WANTED_BY,
1482                 [UNIT_REQUISITE] = UNIT_REQUIRED_BY,
1483                 [UNIT_REQUISITE_OVERRIDABLE] = UNIT_REQUIRED_BY_OVERRIDABLE,
1484                 [UNIT_BIND_TO] = UNIT_BOUND_BY,
1485                 [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID,
1486                 [UNIT_REQUIRED_BY_OVERRIDABLE] = _UNIT_DEPENDENCY_INVALID,
1487                 [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID,
1488                 [UNIT_BOUND_BY] = UNIT_BIND_TO,
1489                 [UNIT_CONFLICTS] = UNIT_CONFLICTED_BY,
1490                 [UNIT_CONFLICTED_BY] = UNIT_CONFLICTS,
1491                 [UNIT_BEFORE] = UNIT_AFTER,
1492                 [UNIT_AFTER] = UNIT_BEFORE,
1493                 [UNIT_ON_FAILURE] = _UNIT_DEPENDENCY_INVALID,
1494                 [UNIT_REFERENCES] = UNIT_REFERENCED_BY,
1495                 [UNIT_REFERENCED_BY] = UNIT_REFERENCES
1496         };
1497         int r, q = 0, v = 0, w = 0;
1498
1499         assert(u);
1500         assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX);
1501         assert(other);
1502
1503         u = unit_follow_merge(u);
1504         other = unit_follow_merge(other);
1505
1506         /* We won't allow dependencies on ourselves. We will not
1507          * consider them an error however. */
1508         if (u == other)
1509                 return 0;
1510
1511         if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0)
1512                 return r;
1513
1514         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1515                 if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0)
1516                         return r;
1517
1518         if (add_reference)
1519                 if ((r = set_ensure_allocated(&u->meta.dependencies[UNIT_REFERENCES], trivial_hash_func, trivial_compare_func)) < 0 ||
1520                     (r = set_ensure_allocated(&other->meta.dependencies[UNIT_REFERENCED_BY], trivial_hash_func, trivial_compare_func)) < 0)
1521                         return r;
1522
1523         if ((q = set_put(u->meta.dependencies[d], other)) < 0)
1524                 return q;
1525
1526         if (inverse_table[d] != _UNIT_DEPENDENCY_INVALID)
1527                 if ((v = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) {
1528                         r = v;
1529                         goto fail;
1530                 }
1531
1532         if (add_reference) {
1533                 if ((w = set_put(u->meta.dependencies[UNIT_REFERENCES], other)) < 0) {
1534                         r = w;
1535                         goto fail;
1536                 }
1537
1538                 if ((r = set_put(other->meta.dependencies[UNIT_REFERENCED_BY], u)) < 0)
1539                         goto fail;
1540         }
1541
1542         unit_add_to_dbus_queue(u);
1543         return 0;
1544
1545 fail:
1546         if (q > 0)
1547                 set_remove(u->meta.dependencies[d], other);
1548
1549         if (v > 0)
1550                 set_remove(other->meta.dependencies[inverse_table[d]], u);
1551
1552         if (w > 0)
1553                 set_remove(u->meta.dependencies[UNIT_REFERENCES], other);
1554
1555         return r;
1556 }
1557
1558 int unit_add_two_dependencies(Unit *u, UnitDependency d, UnitDependency e, Unit *other, bool add_reference) {
1559         int r;
1560
1561         assert(u);
1562
1563         if ((r = unit_add_dependency(u, d, other, add_reference)) < 0)
1564                 return r;
1565
1566         if ((r = unit_add_dependency(u, e, other, add_reference)) < 0)
1567                 return r;
1568
1569         return 0;
1570 }
1571
1572 static const char *resolve_template(Unit *u, const char *name, const char*path, char **p) {
1573         char *s;
1574
1575         assert(u);
1576         assert(name || path);
1577
1578         if (!name)
1579                 name = file_name_from_path(path);
1580
1581         if (!unit_name_is_template(name)) {
1582                 *p = NULL;
1583                 return name;
1584         }
1585
1586         if (u->meta.instance)
1587                 s = unit_name_replace_instance(name, u->meta.instance);
1588         else {
1589                 char *i;
1590
1591                 if (!(i = unit_name_to_prefix(u->meta.id)))
1592                         return NULL;
1593
1594                 s = unit_name_replace_instance(name, i);
1595                 free(i);
1596         }
1597
1598         if (!s)
1599                 return NULL;
1600
1601         *p = s;
1602         return s;
1603 }
1604
1605 int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1606         Unit *other;
1607         int r;
1608         char *s;
1609
1610         assert(u);
1611         assert(name || path);
1612
1613         if (!(name = resolve_template(u, name, path, &s)))
1614                 return -ENOMEM;
1615
1616         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1617                 goto finish;
1618
1619         r = unit_add_dependency(u, d, other, add_reference);
1620
1621 finish:
1622         free(s);
1623         return r;
1624 }
1625
1626 int unit_add_two_dependencies_by_name(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1627         Unit *other;
1628         int r;
1629         char *s;
1630
1631         assert(u);
1632         assert(name || path);
1633
1634         if (!(name = resolve_template(u, name, path, &s)))
1635                 return -ENOMEM;
1636
1637         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1638                 goto finish;
1639
1640         r = unit_add_two_dependencies(u, d, e, other, add_reference);
1641
1642 finish:
1643         free(s);
1644         return r;
1645 }
1646
1647 int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *path, bool add_reference) {
1648         Unit *other;
1649         int r;
1650         char *s;
1651
1652         assert(u);
1653         assert(name || path);
1654
1655         if (!(name = resolve_template(u, name, path, &s)))
1656                 return -ENOMEM;
1657
1658         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1659                 goto finish;
1660
1661         r = unit_add_dependency(other, d, u, add_reference);
1662
1663 finish:
1664         free(s);
1665         return r;
1666 }
1667
1668 int unit_add_two_dependencies_by_name_inverse(Unit *u, UnitDependency d, UnitDependency e, const char *name, const char *path, bool add_reference) {
1669         Unit *other;
1670         int r;
1671         char *s;
1672
1673         assert(u);
1674         assert(name || path);
1675
1676         if (!(name = resolve_template(u, name, path, &s)))
1677                 return -ENOMEM;
1678
1679         if ((r = manager_load_unit(u->meta.manager, name, path, NULL, &other)) < 0)
1680                 goto finish;
1681
1682         if ((r = unit_add_two_dependencies(other, d, e, u, add_reference)) < 0)
1683                 goto finish;
1684
1685 finish:
1686         free(s);
1687         return r;
1688 }
1689
1690 int set_unit_path(const char *p) {
1691         char *cwd, *c;
1692         int r;
1693
1694         /* This is mostly for debug purposes */
1695
1696         if (path_is_absolute(p)) {
1697                 if (!(c = strdup(p)))
1698                         return -ENOMEM;
1699         } else {
1700                 if (!(cwd = get_current_dir_name()))
1701                         return -errno;
1702
1703                 r = asprintf(&c, "%s/%s", cwd, p);
1704                 free(cwd);
1705
1706                 if (r < 0)
1707                         return -ENOMEM;
1708         }
1709
1710         if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) {
1711                 r = -errno;
1712                 free(c);
1713                 return r;
1714         }
1715
1716         return 0;
1717 }
1718
1719 char *unit_dbus_path(Unit *u) {
1720         char *p, *e;
1721
1722         assert(u);
1723
1724         if (!u->meta.id)
1725                 return NULL;
1726
1727         if (!(e = bus_path_escape(u->meta.id)))
1728                 return NULL;
1729
1730         p = strappend("/org/freedesktop/systemd1/unit/", e);
1731         free(e);
1732
1733         return p;
1734 }
1735
1736 int unit_add_cgroup(Unit *u, CGroupBonding *b) {
1737         int r;
1738
1739         assert(u);
1740         assert(b);
1741
1742         assert(b->path);
1743
1744         if (!b->controller)
1745                 if (!(b->controller = strdup(SYSTEMD_CGROUP_CONTROLLER)))
1746                         return -ENOMEM;
1747
1748         /* Ensure this hasn't been added yet */
1749         assert(!b->unit);
1750
1751         if (streq(b->controller, SYSTEMD_CGROUP_CONTROLLER)) {
1752                 CGroupBonding *l;
1753
1754                 l = hashmap_get(u->meta.manager->cgroup_bondings, b->path);
1755                 LIST_PREPEND(CGroupBonding, by_path, l, b);
1756
1757                 if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) {
1758                         LIST_REMOVE(CGroupBonding, by_path, l, b);
1759                         return r;
1760                 }
1761         }
1762
1763         LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b);
1764         b->unit = u;
1765
1766         return 0;
1767 }
1768
1769 static char *default_cgroup_path(Unit *u) {
1770         char *p;
1771         int r;
1772
1773         assert(u);
1774
1775         if (u->meta.instance) {
1776                 char *t;
1777
1778                 if (!(t = unit_name_template(u->meta.id)))
1779                         return NULL;
1780
1781                 r = asprintf(&p, "%s/%s/%s", u->meta.manager->cgroup_hierarchy, t, u->meta.instance);
1782                 free(t);
1783         } else
1784                 r = asprintf(&p, "%s/%s", u->meta.manager->cgroup_hierarchy, u->meta.id);
1785
1786         return r < 0 ? NULL : p;
1787 }
1788
1789 int unit_add_cgroup_from_text(Unit *u, const char *name) {
1790         char *controller = NULL, *path = NULL;
1791         CGroupBonding *b = NULL;
1792         int r;
1793
1794         assert(u);
1795         assert(name);
1796
1797         if ((r = cg_split_spec(name, &controller, &path)) < 0)
1798                 return r;
1799
1800         if (!path)
1801                 path = default_cgroup_path(u);
1802
1803         if (!controller)
1804                 controller = strdup(SYSTEMD_CGROUP_CONTROLLER);
1805
1806         if (!path || !controller) {
1807                 free(path);
1808                 free(controller);
1809
1810                 return -ENOMEM;
1811         }
1812
1813         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) {
1814                 r = -EEXIST;
1815                 goto fail;
1816         }
1817
1818         if (!(b = new0(CGroupBonding, 1))) {
1819                 r = -ENOMEM;
1820                 goto fail;
1821         }
1822
1823         b->controller = controller;
1824         b->path = path;
1825         b->ours = false;
1826
1827         if ((r = unit_add_cgroup(u, b)) < 0)
1828                 goto fail;
1829
1830         return 0;
1831
1832 fail:
1833         free(path);
1834         free(controller);
1835         free(b);
1836
1837         return r;
1838 }
1839
1840 static int unit_add_one_default_cgroup(Unit *u, const char *controller) {
1841         CGroupBonding *b = NULL;
1842         int r = -ENOMEM;
1843
1844         assert(u);
1845
1846         if (!controller)
1847                 controller = SYSTEMD_CGROUP_CONTROLLER;
1848
1849         if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller))
1850                 return 0;
1851
1852         if (!(b = new0(CGroupBonding, 1)))
1853                 return -ENOMEM;
1854
1855         if (!(b->controller = strdup(controller)))
1856                 goto fail;
1857
1858         if (!(b->path = default_cgroup_path(u)))
1859                 goto fail;
1860
1861         b->ours = true;
1862         b->essential = streq(controller, SYSTEMD_CGROUP_CONTROLLER);
1863
1864         if ((r = unit_add_cgroup(u, b)) < 0)
1865                 goto fail;
1866
1867         return 0;
1868
1869 fail:
1870         free(b->path);
1871         free(b->controller);
1872         free(b);
1873
1874         return r;
1875 }
1876
1877 int unit_add_default_cgroups(Unit *u) {
1878         char **c;
1879         int r;
1880         assert(u);
1881
1882         /* Adds in the default cgroups, if they weren't specified
1883          * otherwise. */
1884
1885         if (!u->meta.manager->cgroup_hierarchy)
1886                 return 0;
1887
1888         if ((r = unit_add_one_default_cgroup(u, NULL)) < 0)
1889                 return r;
1890
1891         STRV_FOREACH(c, u->meta.manager->default_controllers)
1892                 if ((r = unit_add_one_default_cgroup(u, *c)) < 0)
1893                         return r;
1894
1895         return 0;
1896 }
1897
1898 CGroupBonding* unit_get_default_cgroup(Unit *u) {
1899         assert(u);
1900
1901         return cgroup_bonding_find_list(u->meta.cgroup_bondings, SYSTEMD_CGROUP_CONTROLLER);
1902 }
1903
1904 int unit_load_related_unit(Unit *u, const char *type, Unit **_found) {
1905         char *t;
1906         int r;
1907
1908         assert(u);
1909         assert(type);
1910         assert(_found);
1911
1912         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1913                 return -ENOMEM;
1914
1915         assert(!unit_has_name(u, t));
1916
1917         r = manager_load_unit(u->meta.manager, t, NULL, NULL, _found);
1918         free(t);
1919
1920         assert(r < 0 || *_found != u);
1921
1922         return r;
1923 }
1924
1925 int unit_get_related_unit(Unit *u, const char *type, Unit **_found) {
1926         Unit *found;
1927         char *t;
1928
1929         assert(u);
1930         assert(type);
1931         assert(_found);
1932
1933         if (!(t = unit_name_change_suffix(u->meta.id, type)))
1934                 return -ENOMEM;
1935
1936         assert(!unit_has_name(u, t));
1937
1938         found = manager_get_unit(u->meta.manager, t);
1939         free(t);
1940
1941         if (!found)
1942                 return -ENOENT;
1943
1944         *_found = found;
1945         return 0;
1946 }
1947
1948 static char *specifier_prefix_and_instance(char specifier, void *data, void *userdata) {
1949         Unit *u = userdata;
1950         assert(u);
1951
1952         return unit_name_to_prefix_and_instance(u->meta.id);
1953 }
1954
1955 static char *specifier_prefix(char specifier, void *data, void *userdata) {
1956         Unit *u = userdata;
1957         assert(u);
1958
1959         return unit_name_to_prefix(u->meta.id);
1960 }
1961
1962 static char *specifier_prefix_unescaped(char specifier, void *data, void *userdata) {
1963         Unit *u = userdata;
1964         char *p, *r;
1965
1966         assert(u);
1967
1968         if (!(p = unit_name_to_prefix(u->meta.id)))
1969                 return NULL;
1970
1971         r = unit_name_unescape(p);
1972         free(p);
1973
1974         return r;
1975 }
1976
1977 static char *specifier_instance_unescaped(char specifier, void *data, void *userdata) {
1978         Unit *u = userdata;
1979         assert(u);
1980
1981         if (u->meta.instance)
1982                 return unit_name_unescape(u->meta.instance);
1983
1984         return strdup("");
1985 }
1986
1987 static char *specifier_filename(char specifier, void *data, void *userdata) {
1988         Unit *u = userdata;
1989         assert(u);
1990
1991         if (u->meta.instance)
1992                 return unit_name_path_unescape(u->meta.instance);
1993
1994         return unit_name_to_path(u->meta.instance);
1995 }
1996
1997 char *unit_name_printf(Unit *u, const char* format) {
1998
1999         /*
2000          * This will use the passed string as format string and
2001          * replace the following specifiers:
2002          *
2003          * %n: the full id of the unit                 (foo@bar.waldo)
2004          * %N: the id of the unit without the suffix   (foo@bar)
2005          * %p: the prefix                              (foo)
2006          * %i: the instance                            (bar)
2007          */
2008
2009         const Specifier table[] = {
2010                 { 'n', specifier_string,              u->meta.id },
2011                 { 'N', specifier_prefix_and_instance, NULL },
2012                 { 'p', specifier_prefix,              NULL },
2013                 { 'i', specifier_string,              u->meta.instance },
2014                 { 0, NULL, NULL }
2015         };
2016
2017         assert(u);
2018         assert(format);
2019
2020         return specifier_printf(format, table, u);
2021 }
2022
2023 char *unit_full_printf(Unit *u, const char *format) {
2024
2025         /* This is similar to unit_name_printf() but also supports
2026          * unescaping */
2027
2028         const Specifier table[] = {
2029                 { 'n', specifier_string,              u->meta.id },
2030                 { 'N', specifier_prefix_and_instance, NULL },
2031                 { 'p', specifier_prefix,              NULL },
2032                 { 'P', specifier_prefix_unescaped,    NULL },
2033                 { 'i', specifier_string,              u->meta.instance },
2034                 { 'I', specifier_instance_unescaped,  NULL },
2035                 { 'f', specifier_filename,            NULL },
2036                 { 0, NULL, NULL }
2037         };
2038
2039         assert(u);
2040         assert(format);
2041
2042         return specifier_printf(format, table, u);
2043 }
2044
2045 char **unit_full_printf_strv(Unit *u, char **l) {
2046         size_t n;
2047         char **r, **i, **j;
2048
2049         /* Applies unit_full_printf to every entry in l */
2050
2051         assert(u);
2052
2053         n = strv_length(l);
2054         if (!(r = new(char*, n+1)))
2055                 return NULL;
2056
2057         for (i = l, j = r; *i; i++, j++)
2058                 if (!(*j = unit_full_printf(u, *i)))
2059                         goto fail;
2060
2061         *j = NULL;
2062         return r;
2063
2064 fail:
2065         for (j--; j >= r; j--)
2066                 free(*j);
2067
2068         free(r);
2069
2070         return NULL;
2071 }
2072
2073 int unit_watch_bus_name(Unit *u, const char *name) {
2074         assert(u);
2075         assert(name);
2076
2077         /* Watch a specific name on the bus. We only support one unit
2078          * watching each name for now. */
2079
2080         return hashmap_put(u->meta.manager->watch_bus, name, u);
2081 }
2082
2083 void unit_unwatch_bus_name(Unit *u, const char *name) {
2084         assert(u);
2085         assert(name);
2086
2087         hashmap_remove_value(u->meta.manager->watch_bus, name, u);
2088 }
2089
2090 bool unit_can_serialize(Unit *u) {
2091         assert(u);
2092
2093         return UNIT_VTABLE(u)->serialize && UNIT_VTABLE(u)->deserialize_item;
2094 }
2095
2096 int unit_serialize(Unit *u, FILE *f, FDSet *fds) {
2097         int r;
2098
2099         assert(u);
2100         assert(f);
2101         assert(fds);
2102
2103         if (!unit_can_serialize(u))
2104                 return 0;
2105
2106         if ((r = UNIT_VTABLE(u)->serialize(u, f, fds)) < 0)
2107                 return r;
2108
2109         if (u->meta.job)
2110                 unit_serialize_item(u, f, "job", job_type_to_string(u->meta.job->type));
2111
2112         dual_timestamp_serialize(f, "inactive-exit-timestamp", &u->meta.inactive_exit_timestamp);
2113         dual_timestamp_serialize(f, "active-enter-timestamp", &u->meta.active_enter_timestamp);
2114         dual_timestamp_serialize(f, "active-exit-timestamp", &u->meta.active_exit_timestamp);
2115         dual_timestamp_serialize(f, "inactive-enter-timestamp", &u->meta.inactive_enter_timestamp);
2116         dual_timestamp_serialize(f, "condition-timestamp", &u->meta.condition_timestamp);
2117
2118         if (dual_timestamp_is_set(&u->meta.condition_timestamp))
2119                 unit_serialize_item(u, f, "condition-result", yes_no(u->meta.condition_result));
2120
2121         /* End marker */
2122         fputc('\n', f);
2123         return 0;
2124 }
2125
2126 void unit_serialize_item_format(Unit *u, FILE *f, const char *key, const char *format, ...) {
2127         va_list ap;
2128
2129         assert(u);
2130         assert(f);
2131         assert(key);
2132         assert(format);
2133
2134         fputs(key, f);
2135         fputc('=', f);
2136
2137         va_start(ap, format);
2138         vfprintf(f, format, ap);
2139         va_end(ap);
2140
2141         fputc('\n', f);
2142 }
2143
2144 void unit_serialize_item(Unit *u, FILE *f, const char *key, const char *value) {
2145         assert(u);
2146         assert(f);
2147         assert(key);
2148         assert(value);
2149
2150         fprintf(f, "%s=%s\n", key, value);
2151 }
2152
2153 int unit_deserialize(Unit *u, FILE *f, FDSet *fds) {
2154         int r;
2155
2156         assert(u);
2157         assert(f);
2158         assert(fds);
2159
2160         if (!unit_can_serialize(u))
2161                 return 0;
2162
2163         for (;;) {
2164                 char line[LINE_MAX], *l, *v;
2165                 size_t k;
2166
2167                 if (!fgets(line, sizeof(line), f)) {
2168                         if (feof(f))
2169                                 return 0;
2170                         return -errno;
2171                 }
2172
2173                 char_array_0(line);
2174                 l = strstrip(line);
2175
2176                 /* End marker */
2177                 if (l[0] == 0)
2178                         return 0;
2179
2180                 k = strcspn(l, "=");
2181
2182                 if (l[k] == '=') {
2183                         l[k] = 0;
2184                         v = l+k+1;
2185                 } else
2186                         v = l+k;
2187
2188                 if (streq(l, "job")) {
2189                         JobType type;
2190
2191                         if ((type = job_type_from_string(v)) < 0)
2192                                 log_debug("Failed to parse job type value %s", v);
2193                         else
2194                                 u->meta.deserialized_job = type;
2195
2196                         continue;
2197                 } else if (streq(l, "inactive-exit-timestamp")) {
2198                         dual_timestamp_deserialize(v, &u->meta.inactive_exit_timestamp);
2199                         continue;
2200                 } else if (streq(l, "active-enter-timestamp")) {
2201                         dual_timestamp_deserialize(v, &u->meta.active_enter_timestamp);
2202                         continue;
2203                 } else if (streq(l, "active-exit-timestamp")) {
2204                         dual_timestamp_deserialize(v, &u->meta.active_exit_timestamp);
2205                         continue;
2206                 } else if (streq(l, "inactive-enter-timestamp")) {
2207                         dual_timestamp_deserialize(v, &u->meta.inactive_enter_timestamp);
2208                         continue;
2209                 } else if (streq(l, "condition-timestamp")) {
2210                         dual_timestamp_deserialize(v, &u->meta.condition_timestamp);
2211                         continue;
2212                 } else if (streq(l, "condition-result")) {
2213                         int b;
2214
2215                         if ((b = parse_boolean(v)) < 0)
2216                                 log_debug("Failed to parse condition result value %s", v);
2217                         else
2218                                 u->meta.condition_result = b;
2219
2220                         continue;
2221                 }
2222
2223                 if ((r = UNIT_VTABLE(u)->deserialize_item(u, l, v, fds)) < 0)
2224                         return r;
2225         }
2226 }
2227
2228 int unit_add_node_link(Unit *u, const char *what, bool wants) {
2229         Unit *device;
2230         char *e;
2231         int r;
2232
2233         assert(u);
2234
2235         if (!what)
2236                 return 0;
2237
2238         /* Adds in links to the device node that this unit is based on */
2239
2240         if (!is_device_path(what))
2241                 return 0;
2242
2243         if (!(e = unit_name_build_escape(what+1, NULL, ".device")))
2244                 return -ENOMEM;
2245
2246         r = manager_load_unit(u->meta.manager, e, NULL, NULL, &device);
2247         free(e);
2248
2249         if (r < 0)
2250                 return r;
2251
2252         if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_BIND_TO, device, true)) < 0)
2253                 return r;
2254
2255         if (wants)
2256                 if ((r = unit_add_dependency(device, UNIT_WANTS, u, false)) < 0)
2257                         return r;
2258
2259         return 0;
2260 }
2261
2262 int unit_coldplug(Unit *u) {
2263         int r;
2264
2265         assert(u);
2266
2267         if (UNIT_VTABLE(u)->coldplug)
2268                 if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0)
2269                         return r;
2270
2271         if (u->meta.deserialized_job >= 0) {
2272                 if ((r = manager_add_job(u->meta.manager, u->meta.deserialized_job, u, JOB_IGNORE_REQUIREMENTS, false, NULL, NULL)) < 0)
2273                         return r;
2274
2275                 u->meta.deserialized_job = _JOB_TYPE_INVALID;
2276         }
2277
2278         return 0;
2279 }
2280
2281 void unit_status_printf(Unit *u, const char *format, ...) {
2282         va_list ap;
2283
2284         assert(u);
2285         assert(format);
2286
2287         if (!UNIT_VTABLE(u)->show_status)
2288                 return;
2289
2290         if (u->meta.manager->running_as != MANAGER_SYSTEM)
2291                 return;
2292
2293         /* If Plymouth is running make sure we show the status, so
2294          * that there's something nice to see when people press Esc */
2295
2296         if (!u->meta.manager->show_status && !plymouth_running())
2297                 return;
2298
2299         if (!manager_is_booting_or_shutting_down(u->meta.manager))
2300                 return;
2301
2302         va_start(ap, format);
2303         status_vprintf(format, ap);
2304         va_end(ap);
2305 }
2306
2307 bool unit_need_daemon_reload(Unit *u) {
2308         struct stat st;
2309
2310         assert(u);
2311
2312         if (!u->meta.fragment_path)
2313                 return false;
2314
2315         zero(st);
2316         if (stat(u->meta.fragment_path, &st) < 0)
2317                 /* What, cannot access this anymore? */
2318                 return true;
2319
2320         return
2321                 u->meta.fragment_mtime &&
2322                 timespec_load(&st.st_mtim) != u->meta.fragment_mtime;
2323 }
2324
2325 void unit_reset_failed(Unit *u) {
2326         assert(u);
2327
2328         if (UNIT_VTABLE(u)->reset_failed)
2329                 UNIT_VTABLE(u)->reset_failed(u);
2330 }
2331
2332 Unit *unit_following(Unit *u) {
2333         assert(u);
2334
2335         if (UNIT_VTABLE(u)->following)
2336                 return UNIT_VTABLE(u)->following(u);
2337
2338         return NULL;
2339 }
2340
2341 bool unit_pending_inactive(Unit *u) {
2342         assert(u);
2343
2344         /* Returns true if the unit is inactive or going down */
2345
2346         if (UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)))
2347                 return true;
2348
2349         if (u->meta.job && u->meta.job->type == JOB_STOP)
2350                 return true;
2351
2352         return false;
2353 }
2354
2355 bool unit_pending_active(Unit *u) {
2356         assert(u);
2357
2358         /* Returns true if the unit is inactive or going down */
2359
2360         if (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
2361                 return true;
2362
2363         if (u->meta.job &&
2364             (u->meta.job->type == JOB_START ||
2365              u->meta.job->type == JOB_RELOAD_OR_START ||
2366              u->meta.job->type == JOB_RESTART))
2367                 return true;
2368
2369         return false;
2370 }
2371
2372 UnitType unit_name_to_type(const char *n) {
2373         UnitType t;
2374
2375         assert(n);
2376
2377         for (t = 0; t < _UNIT_TYPE_MAX; t++)
2378                 if (endswith(n, unit_vtable[t]->suffix))
2379                         return t;
2380
2381         return _UNIT_TYPE_INVALID;
2382 }
2383
2384 bool unit_name_is_valid(const char *n, bool template_ok) {
2385         UnitType t;
2386
2387         t = unit_name_to_type(n);
2388         if (t < 0 || t >= _UNIT_TYPE_MAX)
2389                 return false;
2390
2391         return unit_name_is_valid_no_type(n, template_ok);
2392 }
2393
2394 int unit_kill(Unit *u, KillWho w, KillMode m, int signo, DBusError *error) {
2395         assert(u);
2396         assert(w >= 0 && w < _KILL_WHO_MAX);
2397         assert(m >= 0 && m < _KILL_MODE_MAX);
2398         assert(signo > 0);
2399         assert(signo < _NSIG);
2400
2401         if (m == KILL_NONE)
2402                 return 0;
2403
2404         if (!UNIT_VTABLE(u)->kill)
2405                 return -ENOTSUP;
2406
2407         return UNIT_VTABLE(u)->kill(u, w, m, signo, error);
2408 }
2409
2410
2411 int unit_following_set(Unit *u, Set **s) {
2412         assert(u);
2413         assert(s);
2414
2415         if (UNIT_VTABLE(u)->following_set)
2416                 return UNIT_VTABLE(u)->following_set(u, s);
2417
2418         *s = NULL;
2419         return 0;
2420 }
2421
2422 static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
2423         [UNIT_STUB] = "stub",
2424         [UNIT_LOADED] = "loaded",
2425         [UNIT_ERROR] = "error",
2426         [UNIT_MERGED] = "merged",
2427         [UNIT_MASKED] = "masked"
2428 };
2429
2430 DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
2431
2432 static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
2433         [UNIT_ACTIVE] = "active",
2434         [UNIT_RELOADING] = "reloading",
2435         [UNIT_INACTIVE] = "inactive",
2436         [UNIT_FAILED] = "failed",
2437         [UNIT_ACTIVATING] = "activating",
2438         [UNIT_DEACTIVATING] = "deactivating"
2439 };
2440
2441 DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
2442
2443 static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
2444         [UNIT_REQUIRES] = "Requires",
2445         [UNIT_REQUIRES_OVERRIDABLE] = "RequiresOverridable",
2446         [UNIT_WANTS] = "Wants",
2447         [UNIT_REQUISITE] = "Requisite",
2448         [UNIT_REQUISITE_OVERRIDABLE] = "RequisiteOverridable",
2449         [UNIT_REQUIRED_BY] = "RequiredBy",
2450         [UNIT_REQUIRED_BY_OVERRIDABLE] = "RequiredByOverridable",
2451         [UNIT_BIND_TO] = "BindTo",
2452         [UNIT_WANTED_BY] = "WantedBy",
2453         [UNIT_CONFLICTS] = "Conflicts",
2454         [UNIT_CONFLICTED_BY] = "ConflictedBy",
2455         [UNIT_BOUND_BY] = "BoundBy",
2456         [UNIT_BEFORE] = "Before",
2457         [UNIT_AFTER] = "After",
2458         [UNIT_REFERENCES] = "References",
2459         [UNIT_REFERENCED_BY] = "ReferencedBy",
2460         [UNIT_ON_FAILURE] = "OnFailure"
2461 };
2462
2463 DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);