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87f0e418 LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
a7334b09 LP |
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 | ||
87f0e418 LP |
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> | |
0301abf4 LP |
28 | #include <stdlib.h> |
29 | #include <unistd.h> | |
87f0e418 LP |
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 | ||
39 | const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = { | |
40 | [UNIT_SERVICE] = &service_vtable, | |
41 | [UNIT_TIMER] = &timer_vtable, | |
42 | [UNIT_SOCKET] = &socket_vtable, | |
43 | [UNIT_TARGET] = &target_vtable, | |
44 | [UNIT_DEVICE] = &device_vtable, | |
45 | [UNIT_MOUNT] = &mount_vtable, | |
46 | [UNIT_AUTOMOUNT] = &automount_vtable, | |
47 | [UNIT_SNAPSHOT] = &snapshot_vtable | |
48 | }; | |
49 | ||
50 | UnitType unit_name_to_type(const char *n) { | |
51 | UnitType t; | |
52 | ||
53 | assert(n); | |
54 | ||
55 | for (t = 0; t < _UNIT_TYPE_MAX; t++) | |
56 | if (endswith(n, unit_vtable[t]->suffix)) | |
57 | return t; | |
58 | ||
59 | return _UNIT_TYPE_INVALID; | |
60 | } | |
61 | ||
62 | #define VALID_CHARS \ | |
63 | "0123456789" \ | |
64 | "abcdefghijklmnopqrstuvwxyz" \ | |
65 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \ | |
b5ea5d95 | 66 | "-_.\\" |
87f0e418 LP |
67 | |
68 | bool unit_name_is_valid(const char *n) { | |
69 | UnitType t; | |
70 | const char *e, *i; | |
71 | ||
72 | assert(n); | |
73 | ||
74 | if (strlen(n) >= UNIT_NAME_MAX) | |
75 | return false; | |
76 | ||
77 | t = unit_name_to_type(n); | |
78 | if (t < 0 || t >= _UNIT_TYPE_MAX) | |
79 | return false; | |
80 | ||
81 | if (!(e = strrchr(n, '.'))) | |
82 | return false; | |
83 | ||
48e11fe8 LP |
84 | if (e == n) |
85 | return false; | |
86 | ||
87f0e418 LP |
87 | for (i = n; i < e; i++) |
88 | if (!strchr(VALID_CHARS, *i)) | |
89 | return false; | |
90 | ||
91 | return true; | |
92 | } | |
93 | ||
94 | char *unit_name_change_suffix(const char *n, const char *suffix) { | |
95 | char *e, *r; | |
96 | size_t a, b; | |
97 | ||
98 | assert(n); | |
99 | assert(unit_name_is_valid(n)); | |
100 | assert(suffix); | |
101 | ||
102 | assert_se(e = strrchr(n, '.')); | |
103 | a = e - n; | |
104 | b = strlen(suffix); | |
105 | ||
106 | if (!(r = new(char, a + b + 1))) | |
107 | return NULL; | |
108 | ||
109 | memcpy(r, n, a); | |
110 | memcpy(r+a, suffix, b+1); | |
111 | ||
112 | return r; | |
113 | } | |
114 | ||
115 | Unit *unit_new(Manager *m) { | |
116 | Unit *u; | |
117 | ||
118 | assert(m); | |
119 | ||
120 | if (!(u = new0(Unit, 1))) | |
121 | return NULL; | |
122 | ||
123 | if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) { | |
124 | free(u); | |
125 | return NULL; | |
126 | } | |
127 | ||
128 | u->meta.manager = m; | |
129 | u->meta.type = _UNIT_TYPE_INVALID; | |
130 | ||
131 | return u; | |
132 | } | |
133 | ||
f278026d LP |
134 | bool unit_has_name(Unit *u, const char *name) { |
135 | assert(u); | |
136 | assert(name); | |
137 | ||
138 | return !!set_get(u->meta.names, (char*) name); | |
139 | } | |
140 | ||
87f0e418 LP |
141 | int unit_add_name(Unit *u, const char *text) { |
142 | UnitType t; | |
143 | char *s; | |
144 | int r; | |
145 | ||
146 | assert(u); | |
147 | assert(text); | |
148 | ||
149 | if (!unit_name_is_valid(text)) | |
150 | return -EINVAL; | |
151 | ||
152 | if ((t = unit_name_to_type(text)) == _UNIT_TYPE_INVALID) | |
153 | return -EINVAL; | |
154 | ||
155 | if (u->meta.type != _UNIT_TYPE_INVALID && t != u->meta.type) | |
156 | return -EINVAL; | |
157 | ||
158 | if (!(s = strdup(text))) | |
159 | return -ENOMEM; | |
160 | ||
161 | if ((r = set_put(u->meta.names, s)) < 0) { | |
162 | free(s); | |
163 | ||
164 | if (r == -EEXIST) | |
165 | return 0; | |
166 | ||
167 | return r; | |
168 | } | |
169 | ||
170 | if ((r = hashmap_put(u->meta.manager->units, s, u)) < 0) { | |
171 | set_remove(u->meta.names, s); | |
172 | free(s); | |
173 | return r; | |
174 | } | |
175 | ||
ef734fd6 LP |
176 | if (u->meta.type == _UNIT_TYPE_INVALID) |
177 | LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta); | |
178 | ||
87f0e418 LP |
179 | u->meta.type = t; |
180 | ||
181 | if (!u->meta.id) | |
182 | u->meta.id = s; | |
183 | ||
c1e1601e | 184 | unit_add_to_dbus_queue(u); |
87f0e418 LP |
185 | return 0; |
186 | } | |
187 | ||
0ae97ec1 LP |
188 | int unit_choose_id(Unit *u, const char *name) { |
189 | char *s; | |
190 | ||
191 | assert(u); | |
192 | assert(name); | |
193 | ||
194 | /* Selects one of the names of this unit as the id */ | |
195 | ||
196 | if (!(s = set_get(u->meta.names, (char*) name))) | |
197 | return -ENOENT; | |
198 | ||
199 | u->meta.id = s; | |
c1e1601e LP |
200 | |
201 | unit_add_to_dbus_queue(u); | |
0ae97ec1 LP |
202 | return 0; |
203 | } | |
204 | ||
f50e0a01 LP |
205 | int unit_set_description(Unit *u, const char *description) { |
206 | char *s; | |
207 | ||
208 | assert(u); | |
209 | ||
210 | if (!(s = strdup(description))) | |
211 | return -ENOMEM; | |
212 | ||
213 | free(u->meta.description); | |
214 | u->meta.description = s; | |
c1e1601e LP |
215 | |
216 | unit_add_to_dbus_queue(u); | |
f50e0a01 LP |
217 | return 0; |
218 | } | |
219 | ||
87f0e418 LP |
220 | void unit_add_to_load_queue(Unit *u) { |
221 | assert(u); | |
222 | ||
223 | if (u->meta.load_state != UNIT_STUB || u->meta.in_load_queue) | |
224 | return; | |
225 | ||
226 | LIST_PREPEND(Meta, load_queue, u->meta.manager->load_queue, &u->meta); | |
227 | u->meta.in_load_queue = true; | |
228 | } | |
229 | ||
23a177ef LP |
230 | void unit_add_to_cleanup_queue(Unit *u) { |
231 | assert(u); | |
232 | ||
233 | if (u->meta.in_cleanup_queue) | |
234 | return; | |
235 | ||
236 | LIST_PREPEND(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta); | |
237 | u->meta.in_cleanup_queue = true; | |
238 | } | |
239 | ||
c1e1601e LP |
240 | void unit_add_to_dbus_queue(Unit *u) { |
241 | assert(u); | |
242 | ||
243 | if (u->meta.load_state == UNIT_STUB || u->meta.in_dbus_queue || set_isempty(u->meta.manager->subscribed)) | |
244 | return; | |
245 | ||
246 | LIST_PREPEND(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta); | |
247 | u->meta.in_dbus_queue = true; | |
248 | } | |
249 | ||
87f0e418 LP |
250 | static void bidi_set_free(Unit *u, Set *s) { |
251 | Iterator i; | |
252 | Unit *other; | |
253 | ||
254 | assert(u); | |
255 | ||
256 | /* Frees the set and makes sure we are dropped from the | |
257 | * inverse pointers */ | |
258 | ||
259 | SET_FOREACH(other, s, i) { | |
260 | UnitDependency d; | |
261 | ||
262 | for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) | |
263 | set_remove(other->meta.dependencies[d], u); | |
264 | } | |
265 | ||
266 | set_free(s); | |
267 | } | |
268 | ||
269 | void unit_free(Unit *u) { | |
270 | UnitDependency d; | |
271 | Iterator i; | |
272 | char *t; | |
273 | ||
274 | assert(u); | |
275 | ||
c1e1601e LP |
276 | bus_unit_send_removed_signal(u); |
277 | ||
87f0e418 LP |
278 | /* Detach from next 'bigger' objects */ |
279 | ||
8e274523 LP |
280 | cgroup_bonding_free_list(u->meta.cgroup_bondings); |
281 | ||
87f0e418 LP |
282 | SET_FOREACH(t, u->meta.names, i) |
283 | hashmap_remove_value(u->meta.manager->units, t, u); | |
284 | ||
ef734fd6 LP |
285 | if (u->meta.type != _UNIT_TYPE_INVALID) |
286 | LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta); | |
287 | ||
87f0e418 LP |
288 | if (u->meta.in_load_queue) |
289 | LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta); | |
290 | ||
c1e1601e LP |
291 | if (u->meta.in_dbus_queue) |
292 | LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta); | |
293 | ||
23a177ef LP |
294 | if (u->meta.in_cleanup_queue) |
295 | LIST_REMOVE(Meta, cleanup_queue, u->meta.manager->cleanup_queue, &u->meta); | |
296 | ||
297 | if (u->meta.load_state != UNIT_STUB) | |
87f0e418 LP |
298 | if (UNIT_VTABLE(u)->done) |
299 | UNIT_VTABLE(u)->done(u); | |
300 | ||
301 | /* Free data and next 'smaller' objects */ | |
302 | if (u->meta.job) | |
303 | job_free(u->meta.job); | |
304 | ||
305 | for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) | |
306 | bidi_set_free(u, u->meta.dependencies[d]); | |
307 | ||
308 | free(u->meta.description); | |
6be1e7d5 | 309 | free(u->meta.fragment_path); |
87f0e418 LP |
310 | |
311 | while ((t = set_steal_first(u->meta.names))) | |
312 | free(t); | |
313 | set_free(u->meta.names); | |
314 | ||
315 | free(u); | |
316 | } | |
317 | ||
318 | UnitActiveState unit_active_state(Unit *u) { | |
319 | assert(u); | |
320 | ||
321 | if (u->meta.load_state != UNIT_LOADED) | |
322 | return UNIT_INACTIVE; | |
323 | ||
324 | return UNIT_VTABLE(u)->active_state(u); | |
325 | } | |
326 | ||
23a177ef LP |
327 | static void complete_move(Set **s, Set **other) { |
328 | assert(s); | |
329 | assert(other); | |
87f0e418 | 330 | |
23a177ef LP |
331 | if (!*other) |
332 | return; | |
87f0e418 LP |
333 | |
334 | if (*s) | |
23a177ef LP |
335 | set_move(*s, *other); |
336 | else { | |
337 | *s = *other; | |
338 | *other = NULL; | |
339 | } | |
340 | } | |
87f0e418 | 341 | |
23a177ef LP |
342 | static void merge_names(Unit *u, Unit *other) { |
343 | char *t; | |
344 | Iterator i; | |
87f0e418 | 345 | |
23a177ef LP |
346 | assert(u); |
347 | assert(other); | |
348 | ||
349 | complete_move(&u->meta.names, &other->meta.names); | |
350 | ||
351 | while ((t = set_steal_first(other->meta.names))) | |
352 | free(t); | |
353 | ||
354 | set_free(other->meta.names); | |
355 | other->meta.names = NULL; | |
356 | other->meta.id = NULL; | |
357 | ||
358 | SET_FOREACH(t, u->meta.names, i) | |
359 | assert_se(hashmap_replace(u->meta.manager->units, t, u) == 0); | |
87f0e418 LP |
360 | } |
361 | ||
23a177ef LP |
362 | static void merge_dependencies(Unit *u, Unit *other, UnitDependency d) { |
363 | Iterator i; | |
364 | Unit *back; | |
87f0e418 | 365 | int r; |
23a177ef LP |
366 | |
367 | assert(u); | |
368 | assert(other); | |
369 | assert(d < _UNIT_DEPENDENCY_MAX); | |
370 | ||
371 | SET_FOREACH(back, other->meta.dependencies[d], i) { | |
372 | UnitDependency k; | |
373 | ||
374 | for (k = 0; k < _UNIT_DEPENDENCY_MAX; k++) | |
375 | if ((r = set_remove_and_put(back->meta.dependencies[k], other, u)) < 0) { | |
376 | ||
377 | if (r == -EEXIST) | |
378 | set_remove(back->meta.dependencies[k], other); | |
379 | else | |
380 | assert(r == -ENOENT); | |
381 | } | |
382 | } | |
383 | ||
384 | complete_move(&u->meta.dependencies[d], &other->meta.dependencies[d]); | |
385 | ||
386 | set_free(other->meta.dependencies[d]); | |
387 | other->meta.dependencies[d] = NULL; | |
388 | } | |
389 | ||
390 | int unit_merge(Unit *u, Unit *other) { | |
87f0e418 LP |
391 | UnitDependency d; |
392 | ||
393 | assert(u); | |
394 | assert(other); | |
395 | assert(u->meta.manager == other->meta.manager); | |
396 | ||
23a177ef LP |
397 | if (other == u) |
398 | return 0; | |
399 | ||
87f0e418 LP |
400 | /* This merges 'other' into 'unit'. FIXME: This does not |
401 | * rollback on failure. */ | |
402 | ||
403 | if (u->meta.type != u->meta.type) | |
404 | return -EINVAL; | |
405 | ||
23a177ef LP |
406 | if (other->meta.load_state != UNIT_STUB) |
407 | return -EEXIST; | |
87f0e418 LP |
408 | |
409 | /* Merge names */ | |
23a177ef | 410 | merge_names(u, other); |
87f0e418 LP |
411 | |
412 | /* Merge dependencies */ | |
413 | for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) | |
23a177ef | 414 | merge_dependencies(u, other, d); |
87f0e418 | 415 | |
c1e1601e LP |
416 | unit_add_to_dbus_queue(u); |
417 | ||
23a177ef LP |
418 | other->meta.load_state = UNIT_MERGED; |
419 | other->meta.merged_into = u; | |
420 | ||
421 | unit_add_to_cleanup_queue(other); | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | int unit_merge_by_name(Unit *u, const char *name) { | |
427 | Unit *other; | |
428 | ||
429 | assert(u); | |
430 | assert(name); | |
431 | ||
432 | if (!(other = manager_get_unit(u->meta.manager, name))) | |
433 | return unit_add_name(u, name); | |
434 | ||
435 | return unit_merge(u, other); | |
436 | } | |
437 | ||
438 | Unit* unit_follow_merge(Unit *u) { | |
439 | assert(u); | |
440 | ||
441 | while (u->meta.load_state == UNIT_MERGED) | |
442 | assert_se(u = u->meta.merged_into); | |
443 | ||
444 | return u; | |
445 | } | |
446 | ||
447 | int unit_add_exec_dependencies(Unit *u, ExecContext *c) { | |
448 | int r; | |
449 | ||
450 | assert(u); | |
451 | assert(c); | |
452 | ||
453 | if (c->output != EXEC_OUTPUT_KERNEL && c->output != EXEC_OUTPUT_SYSLOG) | |
454 | return 0; | |
455 | ||
456 | /* If syslog or kernel logging is requested, make sure our own | |
457 | * logging daemon is run first. */ | |
458 | ||
459 | if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET)) < 0) | |
460 | return r; | |
461 | ||
462 | if (u->meta.manager->running_as != MANAGER_SESSION) | |
463 | if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET)) < 0) | |
464 | return r; | |
465 | ||
87f0e418 LP |
466 | return 0; |
467 | } | |
468 | ||
469 | const char* unit_id(Unit *u) { | |
470 | assert(u); | |
471 | ||
472 | if (u->meta.id) | |
473 | return u->meta.id; | |
474 | ||
475 | return set_first(u->meta.names); | |
476 | } | |
477 | ||
478 | const char *unit_description(Unit *u) { | |
479 | assert(u); | |
480 | ||
481 | if (u->meta.description) | |
482 | return u->meta.description; | |
483 | ||
484 | return unit_id(u); | |
485 | } | |
486 | ||
487 | void unit_dump(Unit *u, FILE *f, const char *prefix) { | |
87f0e418 LP |
488 | char *t; |
489 | UnitDependency d; | |
490 | Iterator i; | |
47be870b LP |
491 | char *p2; |
492 | const char *prefix2; | |
8e274523 | 493 | CGroupBonding *b; |
87f0e418 LP |
494 | |
495 | assert(u); | |
496 | ||
497 | if (!prefix) | |
498 | prefix = ""; | |
47be870b LP |
499 | p2 = strappend(prefix, "\t"); |
500 | prefix2 = p2 ? p2 : prefix; | |
87f0e418 LP |
501 | |
502 | fprintf(f, | |
503 | "%s→ Unit %s:\n" | |
504 | "%s\tDescription: %s\n" | |
505 | "%s\tUnit Load State: %s\n" | |
23a177ef | 506 | "%s\tUnit Active State: %s\n", |
87f0e418 LP |
507 | prefix, unit_id(u), |
508 | prefix, unit_description(u), | |
94f04347 | 509 | prefix, unit_load_state_to_string(u->meta.load_state), |
23a177ef | 510 | prefix, unit_active_state_to_string(unit_active_state(u))); |
0301abf4 | 511 | |
87f0e418 LP |
512 | SET_FOREACH(t, u->meta.names, i) |
513 | fprintf(f, "%s\tName: %s\n", prefix, t); | |
514 | ||
23a177ef LP |
515 | if (u->meta.fragment_path) |
516 | fprintf(f, "%s\tFragment Path: %s\n", prefix, u->meta.fragment_path); | |
517 | ||
87f0e418 LP |
518 | for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++) { |
519 | Unit *other; | |
520 | ||
521 | if (set_isempty(u->meta.dependencies[d])) | |
522 | continue; | |
523 | ||
524 | SET_FOREACH(other, u->meta.dependencies[d], i) | |
94f04347 | 525 | fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), unit_id(other)); |
87f0e418 LP |
526 | } |
527 | ||
23a177ef LP |
528 | fprintf(f, |
529 | "%s\tRecursive Stop: %s\n" | |
530 | "%s\tStop When Unneeded: %s\n", | |
531 | prefix, yes_no(u->meta.recursive_stop), | |
532 | prefix, yes_no(u->meta.stop_when_unneeded)); | |
533 | ||
534 | if (u->meta.load_state == UNIT_LOADED) { | |
535 | LIST_FOREACH(by_unit, b, u->meta.cgroup_bondings) | |
536 | fprintf(f, "%s\tControlGroup: %s:%s\n", | |
537 | prefix, b->controller, b->path); | |
8e274523 | 538 | |
23a177ef LP |
539 | if (UNIT_VTABLE(u)->dump) |
540 | UNIT_VTABLE(u)->dump(u, f, prefix2); | |
541 | } | |
87f0e418 LP |
542 | |
543 | if (u->meta.job) | |
544 | job_dump(u->meta.job, f, prefix2); | |
545 | ||
47be870b | 546 | free(p2); |
87f0e418 LP |
547 | } |
548 | ||
549 | /* Common implementation for multiple backends */ | |
23a177ef LP |
550 | int unit_load_fragment_and_dropin(Unit *u, UnitLoadState *new_state) { |
551 | int r; | |
552 | ||
553 | assert(u); | |
554 | assert(new_state); | |
555 | assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED); | |
556 | ||
557 | /* Load a .service file */ | |
558 | if ((r = unit_load_fragment(u, new_state)) < 0) | |
559 | return r; | |
560 | ||
561 | if (*new_state == UNIT_STUB) | |
562 | return -ENOENT; | |
563 | ||
564 | /* Load drop-in directory data */ | |
565 | if ((r = unit_load_dropin(unit_follow_merge(u))) < 0) | |
566 | return r; | |
567 | ||
568 | return 0; | |
569 | } | |
570 | ||
571 | /* Common implementation for multiple backends */ | |
572 | int unit_load_fragment_and_dropin_optional(Unit *u, UnitLoadState *new_state) { | |
573 | int r; | |
87f0e418 LP |
574 | |
575 | assert(u); | |
23a177ef LP |
576 | assert(new_state); |
577 | assert(*new_state == UNIT_STUB || *new_state == UNIT_LOADED); | |
87f0e418 | 578 | |
23a177ef LP |
579 | /* Same as unit_load_fragment_and_dropin(), but whether |
580 | * something can be loaded or not doesn't matter. */ | |
581 | ||
582 | /* Load a .service file */ | |
583 | if ((r = unit_load_fragment(u, new_state)) < 0) | |
87f0e418 LP |
584 | return r; |
585 | ||
23a177ef LP |
586 | if (*new_state == UNIT_STUB) |
587 | *new_state = UNIT_LOADED; | |
d46de8a1 | 588 | |
87f0e418 | 589 | /* Load drop-in directory data */ |
23a177ef | 590 | if ((r = unit_load_dropin(unit_follow_merge(u))) < 0) |
87f0e418 LP |
591 | return r; |
592 | ||
23a177ef | 593 | return 0; |
87f0e418 LP |
594 | } |
595 | ||
596 | int unit_load(Unit *u) { | |
597 | int r; | |
23a177ef | 598 | UnitLoadState res; |
87f0e418 LP |
599 | |
600 | assert(u); | |
601 | ||
602 | if (u->meta.in_load_queue) { | |
603 | LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta); | |
604 | u->meta.in_load_queue = false; | |
605 | } | |
606 | ||
607 | if (u->meta.load_state != UNIT_STUB) | |
608 | return 0; | |
609 | ||
23a177ef LP |
610 | if (UNIT_VTABLE(u)->init) { |
611 | res = UNIT_STUB; | |
612 | if ((r = UNIT_VTABLE(u)->init(u, &res)) < 0) | |
87f0e418 | 613 | goto fail; |
23a177ef LP |
614 | } |
615 | ||
616 | if (res == UNIT_STUB) { | |
617 | r = -ENOENT; | |
618 | goto fail; | |
619 | } | |
620 | ||
621 | u->meta.load_state = res; | |
622 | assert((u->meta.load_state != UNIT_MERGED) == !u->meta.merged_into); | |
623 | ||
624 | unit_add_to_dbus_queue(unit_follow_merge(u)); | |
87f0e418 | 625 | |
87f0e418 LP |
626 | return 0; |
627 | ||
628 | fail: | |
629 | u->meta.load_state = UNIT_FAILED; | |
c1e1601e | 630 | unit_add_to_dbus_queue(u); |
23a177ef LP |
631 | |
632 | log_error("Failed to load configuration for %s: %s", unit_id(u), strerror(-r)); | |
633 | ||
87f0e418 LP |
634 | return r; |
635 | } | |
636 | ||
637 | /* Errors: | |
638 | * -EBADR: This unit type does not support starting. | |
639 | * -EALREADY: Unit is already started. | |
640 | * -EAGAIN: An operation is already in progress. Retry later. | |
641 | */ | |
642 | int unit_start(Unit *u) { | |
643 | UnitActiveState state; | |
644 | ||
645 | assert(u); | |
646 | ||
7898b0cf LP |
647 | /* If this is already (being) started, then this will |
648 | * succeed. Note that this will even succeed if this unit is | |
649 | * not startable by the user. This is relied on to detect when | |
650 | * we need to wait for units and when waiting is finished. */ | |
87f0e418 LP |
651 | state = unit_active_state(u); |
652 | if (UNIT_IS_ACTIVE_OR_RELOADING(state)) | |
653 | return -EALREADY; | |
654 | ||
7898b0cf LP |
655 | /* If it is stopped, but we cannot start it, then fail */ |
656 | if (!UNIT_VTABLE(u)->start) | |
657 | return -EBADR; | |
658 | ||
87f0e418 LP |
659 | /* We don't suppress calls to ->start() here when we are |
660 | * already starting, to allow this request to be used as a | |
661 | * "hurry up" call, for example when the unit is in some "auto | |
662 | * restart" state where it waits for a holdoff timer to elapse | |
663 | * before it will start again. */ | |
664 | ||
c1e1601e | 665 | unit_add_to_dbus_queue(u); |
87f0e418 LP |
666 | return UNIT_VTABLE(u)->start(u); |
667 | } | |
668 | ||
669 | bool unit_can_start(Unit *u) { | |
670 | assert(u); | |
671 | ||
672 | return !!UNIT_VTABLE(u)->start; | |
673 | } | |
674 | ||
675 | /* Errors: | |
676 | * -EBADR: This unit type does not support stopping. | |
677 | * -EALREADY: Unit is already stopped. | |
678 | * -EAGAIN: An operation is already in progress. Retry later. | |
679 | */ | |
680 | int unit_stop(Unit *u) { | |
681 | UnitActiveState state; | |
682 | ||
683 | assert(u); | |
684 | ||
87f0e418 LP |
685 | state = unit_active_state(u); |
686 | if (state == UNIT_INACTIVE) | |
687 | return -EALREADY; | |
688 | ||
7898b0cf LP |
689 | if (!UNIT_VTABLE(u)->stop) |
690 | return -EBADR; | |
691 | ||
87f0e418 LP |
692 | if (state == UNIT_DEACTIVATING) |
693 | return 0; | |
694 | ||
c1e1601e | 695 | unit_add_to_dbus_queue(u); |
87f0e418 LP |
696 | return UNIT_VTABLE(u)->stop(u); |
697 | } | |
698 | ||
699 | /* Errors: | |
700 | * -EBADR: This unit type does not support reloading. | |
701 | * -ENOEXEC: Unit is not started. | |
702 | * -EAGAIN: An operation is already in progress. Retry later. | |
703 | */ | |
704 | int unit_reload(Unit *u) { | |
705 | UnitActiveState state; | |
706 | ||
707 | assert(u); | |
708 | ||
709 | if (!unit_can_reload(u)) | |
710 | return -EBADR; | |
711 | ||
712 | state = unit_active_state(u); | |
713 | if (unit_active_state(u) == UNIT_ACTIVE_RELOADING) | |
714 | return -EALREADY; | |
715 | ||
716 | if (unit_active_state(u) != UNIT_ACTIVE) | |
717 | return -ENOEXEC; | |
718 | ||
c1e1601e | 719 | unit_add_to_dbus_queue(u); |
87f0e418 LP |
720 | return UNIT_VTABLE(u)->reload(u); |
721 | } | |
722 | ||
723 | bool unit_can_reload(Unit *u) { | |
724 | assert(u); | |
725 | ||
726 | if (!UNIT_VTABLE(u)->reload) | |
727 | return false; | |
728 | ||
729 | if (!UNIT_VTABLE(u)->can_reload) | |
730 | return true; | |
731 | ||
732 | return UNIT_VTABLE(u)->can_reload(u); | |
733 | } | |
734 | ||
f3bff0eb LP |
735 | static void unit_check_uneeded(Unit *u) { |
736 | Iterator i; | |
737 | Unit *other; | |
738 | ||
739 | assert(u); | |
740 | ||
741 | /* If this service shall be shut down when unneeded then do | |
742 | * so. */ | |
743 | ||
744 | if (!u->meta.stop_when_unneeded) | |
745 | return; | |
746 | ||
747 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) | |
748 | return; | |
749 | ||
750 | SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i) | |
751 | if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) | |
752 | return; | |
753 | ||
754 | SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i) | |
755 | if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) | |
756 | return; | |
757 | ||
758 | SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i) | |
759 | if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) | |
760 | return; | |
761 | ||
762 | log_debug("Service %s is not needed anymore. Stopping.", unit_id(u)); | |
763 | ||
764 | /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */ | |
765 | manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL); | |
766 | } | |
767 | ||
87f0e418 LP |
768 | static void retroactively_start_dependencies(Unit *u) { |
769 | Iterator i; | |
770 | Unit *other; | |
771 | ||
772 | assert(u); | |
773 | assert(UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))); | |
774 | ||
775 | SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i) | |
776 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) | |
777 | manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL); | |
778 | ||
779 | SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i) | |
780 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) | |
781 | manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL); | |
782 | ||
783 | SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i) | |
784 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) | |
785 | manager_add_job(u->meta.manager, JOB_START, other, JOB_REPLACE, true, NULL); | |
786 | ||
787 | SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i) | |
788 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) | |
789 | manager_add_job(u->meta.manager, JOB_START, other, JOB_FAIL, false, NULL); | |
790 | ||
791 | SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i) | |
792 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) | |
793 | manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL); | |
794 | } | |
795 | ||
796 | static void retroactively_stop_dependencies(Unit *u) { | |
797 | Iterator i; | |
798 | Unit *other; | |
799 | ||
800 | assert(u); | |
801 | assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u))); | |
802 | ||
f3bff0eb LP |
803 | if (u->meta.recursive_stop) { |
804 | /* Pull down units need us recursively if enabled */ | |
805 | SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i) | |
806 | if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) | |
807 | manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL); | |
808 | } | |
809 | ||
810 | /* Garbage collect services that might not be needed anymore, if enabled */ | |
811 | SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i) | |
87f0e418 | 812 | if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) |
f3bff0eb LP |
813 | unit_check_uneeded(other); |
814 | SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i) | |
815 | if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) | |
816 | unit_check_uneeded(other); | |
817 | SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i) | |
818 | if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) | |
819 | unit_check_uneeded(other); | |
820 | SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i) | |
821 | if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) | |
822 | unit_check_uneeded(other); | |
823 | SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUISITE], i) | |
824 | if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other))) | |
825 | unit_check_uneeded(other); | |
87f0e418 LP |
826 | } |
827 | ||
828 | void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) { | |
a096ed36 LP |
829 | bool unexpected = false; |
830 | ||
87f0e418 LP |
831 | assert(u); |
832 | assert(os < _UNIT_ACTIVE_STATE_MAX); | |
833 | assert(ns < _UNIT_ACTIVE_STATE_MAX); | |
834 | assert(!(os == UNIT_ACTIVE && ns == UNIT_ACTIVATING)); | |
835 | assert(!(os == UNIT_INACTIVE && ns == UNIT_DEACTIVATING)); | |
836 | ||
837 | if (os == ns) | |
838 | return; | |
839 | ||
840 | if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns)) | |
841 | u->meta.active_enter_timestamp = now(CLOCK_REALTIME); | |
842 | else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns)) | |
843 | u->meta.active_exit_timestamp = now(CLOCK_REALTIME); | |
844 | ||
845 | if (u->meta.job) { | |
846 | ||
847 | if (u->meta.job->state == JOB_WAITING) | |
848 | ||
849 | /* So we reached a different state for this | |
850 | * job. Let's see if we can run it now if it | |
851 | * failed previously due to EAGAIN. */ | |
c1e1601e | 852 | job_add_to_run_queue(u->meta.job); |
87f0e418 LP |
853 | |
854 | else { | |
855 | assert(u->meta.job->state == JOB_RUNNING); | |
856 | ||
f50e0a01 | 857 | /* Let's check whether this state change |
87f0e418 LP |
858 | * constitutes a finished job, or maybe |
859 | * cotradicts a running job and hence needs to | |
860 | * invalidate jobs. */ | |
861 | ||
862 | switch (u->meta.job->type) { | |
863 | ||
864 | case JOB_START: | |
865 | case JOB_VERIFY_ACTIVE: | |
866 | ||
a096ed36 | 867 | if (UNIT_IS_ACTIVE_OR_RELOADING(ns)) |
87f0e418 | 868 | job_finish_and_invalidate(u->meta.job, true); |
a096ed36 LP |
869 | else if (ns != UNIT_ACTIVATING) { |
870 | unexpected = true; | |
87f0e418 | 871 | job_finish_and_invalidate(u->meta.job, false); |
a096ed36 | 872 | } |
87f0e418 LP |
873 | |
874 | break; | |
875 | ||
876 | case JOB_RELOAD: | |
877 | case JOB_RELOAD_OR_START: | |
878 | ||
a096ed36 | 879 | if (ns == UNIT_ACTIVE) |
87f0e418 | 880 | job_finish_and_invalidate(u->meta.job, true); |
a096ed36 LP |
881 | else if (ns != UNIT_ACTIVATING && ns != UNIT_ACTIVE_RELOADING) { |
882 | unexpected = true; | |
87f0e418 | 883 | job_finish_and_invalidate(u->meta.job, false); |
a096ed36 | 884 | } |
87f0e418 LP |
885 | |
886 | break; | |
887 | ||
888 | case JOB_STOP: | |
889 | case JOB_RESTART: | |
890 | case JOB_TRY_RESTART: | |
891 | ||
a096ed36 | 892 | if (ns == UNIT_INACTIVE) |
87f0e418 | 893 | job_finish_and_invalidate(u->meta.job, true); |
a096ed36 LP |
894 | else if (ns != UNIT_DEACTIVATING) { |
895 | unexpected = true; | |
87f0e418 | 896 | job_finish_and_invalidate(u->meta.job, false); |
a096ed36 | 897 | } |
87f0e418 LP |
898 | |
899 | break; | |
900 | ||
901 | default: | |
902 | assert_not_reached("Job type unknown"); | |
903 | } | |
904 | } | |
905 | } | |
906 | ||
907 | /* If this state change happened without being requested by a | |
908 | * job, then let's retroactively start or stop dependencies */ | |
909 | ||
a096ed36 LP |
910 | if (unexpected) { |
911 | if (UNIT_IS_INACTIVE_OR_DEACTIVATING(os) && UNIT_IS_ACTIVE_OR_ACTIVATING(ns)) | |
912 | retroactively_start_dependencies(u); | |
913 | else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns)) | |
914 | retroactively_stop_dependencies(u); | |
915 | } | |
f3bff0eb | 916 | |
f278026d LP |
917 | if (!UNIT_IS_ACTIVE_OR_RELOADING(os) && UNIT_IS_ACTIVE_OR_RELOADING(ns)) { |
918 | ||
919 | if (unit_has_name(u, SPECIAL_DBUS_SERVICE)) { | |
e53ae031 | 920 | log_info("D-Bus became available, trying to reconnect."); |
f278026d LP |
921 | /* The bus just got started, hence try to connect to it. */ |
922 | bus_init_system(u->meta.manager); | |
923 | bus_init_api(u->meta.manager); | |
924 | } | |
925 | ||
e53ae031 | 926 | if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE)) { |
f278026d | 927 | /* The syslog daemon just got started, hence try to connect to it. */ |
e53ae031 | 928 | log_info("Syslog became available, trying to reconnect."); |
2882c7ed | 929 | log_open_syslog(); |
e53ae031 | 930 | } |
f278026d LP |
931 | |
932 | } else if (UNIT_IS_ACTIVE_OR_RELOADING(os) && !UNIT_IS_ACTIVE_OR_RELOADING(ns)) { | |
933 | ||
934 | if (unit_has_name(u, SPECIAL_SYSLOG_SERVICE)) | |
935 | /* The syslog daemon just got terminated, hence try to disconnect from it. */ | |
2882c7ed | 936 | log_close_syslog(); |
f278026d LP |
937 | |
938 | /* We don't care about D-Bus here, since we'll get an | |
939 | * asynchronous notification for it anyway. */ | |
940 | } | |
941 | ||
f3bff0eb LP |
942 | /* Maybe we finished startup and are now ready for being |
943 | * stopped because unneeded? */ | |
944 | unit_check_uneeded(u); | |
c1e1601e LP |
945 | |
946 | unit_add_to_dbus_queue(u); | |
87f0e418 LP |
947 | } |
948 | ||
acbb0225 | 949 | int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) { |
87f0e418 LP |
950 | struct epoll_event ev; |
951 | ||
952 | assert(u); | |
953 | assert(fd >= 0); | |
acbb0225 | 954 | assert(w); |
ea430986 | 955 | assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u)); |
87f0e418 LP |
956 | |
957 | zero(ev); | |
acbb0225 | 958 | ev.data.ptr = w; |
87f0e418 LP |
959 | ev.events = events; |
960 | ||
acbb0225 LP |
961 | if (epoll_ctl(u->meta.manager->epoll_fd, |
962 | w->type == WATCH_INVALID ? EPOLL_CTL_ADD : EPOLL_CTL_MOD, | |
963 | fd, | |
964 | &ev) < 0) | |
965 | return -errno; | |
87f0e418 | 966 | |
acbb0225 LP |
967 | w->fd = fd; |
968 | w->type = WATCH_FD; | |
ea430986 | 969 | w->data.unit = u; |
87f0e418 | 970 | |
acbb0225 | 971 | return 0; |
87f0e418 LP |
972 | } |
973 | ||
acbb0225 | 974 | void unit_unwatch_fd(Unit *u, Watch *w) { |
87f0e418 | 975 | assert(u); |
acbb0225 | 976 | assert(w); |
87f0e418 | 977 | |
acbb0225 LP |
978 | if (w->type == WATCH_INVALID) |
979 | return; | |
980 | ||
ea430986 LP |
981 | assert(w->type == WATCH_FD); |
982 | assert(w->data.unit == u); | |
acbb0225 LP |
983 | assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0); |
984 | ||
985 | w->fd = -1; | |
986 | w->type = WATCH_INVALID; | |
ea430986 | 987 | w->data.unit = NULL; |
87f0e418 LP |
988 | } |
989 | ||
990 | int unit_watch_pid(Unit *u, pid_t pid) { | |
991 | assert(u); | |
992 | assert(pid >= 1); | |
993 | ||
994 | return hashmap_put(u->meta.manager->watch_pids, UINT32_TO_PTR(pid), u); | |
995 | } | |
996 | ||
997 | void unit_unwatch_pid(Unit *u, pid_t pid) { | |
998 | assert(u); | |
999 | assert(pid >= 1); | |
1000 | ||
1001 | hashmap_remove(u->meta.manager->watch_pids, UINT32_TO_PTR(pid)); | |
1002 | } | |
1003 | ||
acbb0225 | 1004 | int unit_watch_timer(Unit *u, usec_t delay, Watch *w) { |
87f0e418 | 1005 | struct itimerspec its; |
acbb0225 | 1006 | int flags, fd; |
87f0e418 LP |
1007 | bool ours; |
1008 | ||
1009 | assert(u); | |
acbb0225 | 1010 | assert(w); |
ea430986 | 1011 | assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u)); |
87f0e418 LP |
1012 | |
1013 | /* This will try to reuse the old timer if there is one */ | |
1014 | ||
acbb0225 | 1015 | if (w->type == WATCH_TIMER) { |
87f0e418 | 1016 | ours = false; |
acbb0225 | 1017 | fd = w->fd; |
87f0e418 LP |
1018 | } else { |
1019 | ours = true; | |
87f0e418 LP |
1020 | if ((fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0) |
1021 | return -errno; | |
1022 | } | |
1023 | ||
1024 | zero(its); | |
1025 | ||
1026 | if (delay <= 0) { | |
1027 | /* Set absolute time in the past, but not 0, since we | |
1028 | * don't want to disarm the timer */ | |
1029 | its.it_value.tv_sec = 0; | |
1030 | its.it_value.tv_nsec = 1; | |
1031 | ||
1032 | flags = TFD_TIMER_ABSTIME; | |
1033 | } else { | |
1034 | timespec_store(&its.it_value, delay); | |
1035 | flags = 0; | |
1036 | } | |
1037 | ||
1038 | /* This will also flush the elapse counter */ | |
1039 | if (timerfd_settime(fd, flags, &its, NULL) < 0) | |
1040 | goto fail; | |
1041 | ||
acbb0225 LP |
1042 | if (w->type == WATCH_INVALID) { |
1043 | struct epoll_event ev; | |
87f0e418 | 1044 | |
acbb0225 LP |
1045 | zero(ev); |
1046 | ev.data.ptr = w; | |
f94ea366 | 1047 | ev.events = EPOLLIN; |
acbb0225 LP |
1048 | |
1049 | if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) | |
1050 | goto fail; | |
1051 | } | |
1052 | ||
1053 | w->fd = fd; | |
1054 | w->type = WATCH_TIMER; | |
ea430986 | 1055 | w->data.unit = u; |
87f0e418 | 1056 | |
87f0e418 LP |
1057 | return 0; |
1058 | ||
1059 | fail: | |
1060 | if (ours) | |
ea430986 | 1061 | close_nointr_nofail(fd); |
87f0e418 LP |
1062 | |
1063 | return -errno; | |
1064 | } | |
1065 | ||
acbb0225 | 1066 | void unit_unwatch_timer(Unit *u, Watch *w) { |
87f0e418 | 1067 | assert(u); |
acbb0225 | 1068 | assert(w); |
87f0e418 | 1069 | |
acbb0225 | 1070 | if (w->type == WATCH_INVALID) |
87f0e418 LP |
1071 | return; |
1072 | ||
ea430986 | 1073 | assert(w->type == WATCH_TIMER && w->data.unit == u); |
acbb0225 LP |
1074 | |
1075 | assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0); | |
1076 | assert_se(close_nointr(w->fd) == 0); | |
1077 | ||
1078 | w->fd = -1; | |
1079 | w->type = WATCH_INVALID; | |
ea430986 | 1080 | w->data.unit = NULL; |
87f0e418 LP |
1081 | } |
1082 | ||
1083 | bool unit_job_is_applicable(Unit *u, JobType j) { | |
1084 | assert(u); | |
1085 | assert(j >= 0 && j < _JOB_TYPE_MAX); | |
1086 | ||
1087 | switch (j) { | |
1088 | ||
1089 | case JOB_VERIFY_ACTIVE: | |
1090 | case JOB_START: | |
1091 | return true; | |
1092 | ||
1093 | case JOB_STOP: | |
1094 | case JOB_RESTART: | |
1095 | case JOB_TRY_RESTART: | |
1096 | return unit_can_start(u); | |
1097 | ||
1098 | case JOB_RELOAD: | |
1099 | return unit_can_reload(u); | |
1100 | ||
1101 | case JOB_RELOAD_OR_START: | |
1102 | return unit_can_reload(u) && unit_can_start(u); | |
1103 | ||
1104 | default: | |
1105 | assert_not_reached("Invalid job type"); | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | int unit_add_dependency(Unit *u, UnitDependency d, Unit *other) { | |
1110 | ||
1111 | static const UnitDependency inverse_table[_UNIT_DEPENDENCY_MAX] = { | |
1112 | [UNIT_REQUIRES] = UNIT_REQUIRED_BY, | |
1113 | [UNIT_SOFT_REQUIRES] = UNIT_SOFT_REQUIRED_BY, | |
1114 | [UNIT_WANTS] = UNIT_WANTED_BY, | |
1115 | [UNIT_REQUISITE] = UNIT_REQUIRED_BY, | |
1116 | [UNIT_SOFT_REQUISITE] = UNIT_SOFT_REQUIRED_BY, | |
1117 | [UNIT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID, | |
1118 | [UNIT_SOFT_REQUIRED_BY] = _UNIT_DEPENDENCY_INVALID, | |
1119 | [UNIT_WANTED_BY] = _UNIT_DEPENDENCY_INVALID, | |
1120 | [UNIT_CONFLICTS] = UNIT_CONFLICTS, | |
1121 | [UNIT_BEFORE] = UNIT_AFTER, | |
1122 | [UNIT_AFTER] = UNIT_BEFORE | |
1123 | }; | |
1124 | int r; | |
1125 | ||
1126 | assert(u); | |
1127 | assert(d >= 0 && d < _UNIT_DEPENDENCY_MAX); | |
1128 | assert(inverse_table[d] != _UNIT_DEPENDENCY_INVALID); | |
1129 | assert(other); | |
1130 | ||
1131 | /* We won't allow dependencies on ourselves. We will not | |
1132 | * consider them an error however. */ | |
1133 | if (u == other) | |
1134 | return 0; | |
1135 | ||
1136 | if ((r = set_ensure_allocated(&u->meta.dependencies[d], trivial_hash_func, trivial_compare_func)) < 0) | |
1137 | return r; | |
1138 | ||
1139 | if ((r = set_ensure_allocated(&other->meta.dependencies[inverse_table[d]], trivial_hash_func, trivial_compare_func)) < 0) | |
1140 | return r; | |
1141 | ||
1142 | if ((r = set_put(u->meta.dependencies[d], other)) < 0) | |
1143 | return r; | |
1144 | ||
1145 | if ((r = set_put(other->meta.dependencies[inverse_table[d]], u)) < 0) { | |
1146 | set_remove(u->meta.dependencies[d], other); | |
1147 | return r; | |
1148 | } | |
1149 | ||
c1e1601e | 1150 | unit_add_to_dbus_queue(u); |
87f0e418 LP |
1151 | return 0; |
1152 | } | |
0301abf4 | 1153 | |
09b6b09f LP |
1154 | int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name) { |
1155 | Unit *other; | |
1156 | int r; | |
1157 | ||
1158 | if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0) | |
1159 | return r; | |
1160 | ||
1161 | if ((r = unit_add_dependency(u, d, other)) < 0) | |
1162 | return r; | |
1163 | ||
1164 | return 0; | |
1165 | } | |
1166 | ||
bd77d0fc LP |
1167 | int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name) { |
1168 | Unit *other; | |
1169 | int r; | |
1170 | ||
1171 | if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0) | |
1172 | return r; | |
1173 | ||
1174 | if ((r = unit_add_dependency(other, d, u)) < 0) | |
1175 | return r; | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
0301abf4 LP |
1180 | int set_unit_path(const char *p) { |
1181 | char *cwd, *c; | |
1182 | int r; | |
1183 | ||
1184 | /* This is mostly for debug purposes */ | |
1185 | ||
1186 | if (path_is_absolute(p)) { | |
1187 | if (!(c = strdup(p))) | |
1188 | return -ENOMEM; | |
1189 | } else { | |
1190 | if (!(cwd = get_current_dir_name())) | |
1191 | return -errno; | |
1192 | ||
1193 | r = asprintf(&c, "%s/%s", cwd, p); | |
1194 | free(cwd); | |
1195 | ||
1196 | if (r < 0) | |
1197 | return -ENOMEM; | |
1198 | } | |
1199 | ||
036643a2 | 1200 | if (setenv("SYSTEMD_UNIT_PATH", c, 0) < 0) { |
0301abf4 LP |
1201 | r = -errno; |
1202 | free(c); | |
1203 | return r; | |
1204 | } | |
1205 | ||
1206 | return 0; | |
1207 | } | |
88066b3a | 1208 | |
2e478a46 | 1209 | char *unit_name_escape_path(const char *path, const char *suffix) { |
88066b3a LP |
1210 | char *r, *t; |
1211 | const char *f; | |
2e478a46 | 1212 | size_t a, b; |
88066b3a LP |
1213 | |
1214 | assert(path); | |
88066b3a | 1215 | |
b08d03ff LP |
1216 | /* Takes a path and a suffix and prefix and makes a nice |
1217 | * string suitable as unit name of it, escaping all weird | |
1218 | * chars on the way. | |
88066b3a | 1219 | * |
b08d03ff LP |
1220 | * / becomes ., and all chars not alloweed in a unit name get |
1221 | * escaped as \xFF, including \ and ., of course. This | |
1222 | * escaping is hence reversible. | |
88066b3a LP |
1223 | */ |
1224 | ||
b08d03ff LP |
1225 | if (!suffix) |
1226 | suffix = ""; | |
88066b3a | 1227 | |
2e478a46 LP |
1228 | a = strlen(path); |
1229 | b = strlen(suffix); | |
b08d03ff | 1230 | |
2e478a46 | 1231 | if (!(r = new(char, a*4+b+1))) |
88066b3a LP |
1232 | return NULL; |
1233 | ||
2e478a46 | 1234 | for (f = path, t = r; *f; f++) { |
88066b3a | 1235 | if (*f == '/') |
b08d03ff LP |
1236 | *(t++) = '.'; |
1237 | else if (*f == '.' || *f == '\\' || !strchr(VALID_CHARS, *f)) { | |
88066b3a LP |
1238 | *(t++) = '\\'; |
1239 | *(t++) = 'x'; | |
1240 | *(t++) = hexchar(*f > 4); | |
1241 | *(t++) = hexchar(*f); | |
1242 | } else | |
1243 | *(t++) = *f; | |
1244 | } | |
1245 | ||
2e478a46 | 1246 | memcpy(t, suffix, b+1); |
88066b3a LP |
1247 | |
1248 | return r; | |
1249 | } | |
94f04347 | 1250 | |
ea430986 LP |
1251 | char *unit_dbus_path(Unit *u) { |
1252 | char *p, *e; | |
1253 | ||
1254 | assert(u); | |
1255 | ||
1256 | if (!(e = bus_path_escape(unit_id(u)))) | |
1257 | return NULL; | |
1258 | ||
1259 | if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) { | |
1260 | free(e); | |
1261 | return NULL; | |
1262 | } | |
1263 | ||
1264 | free(e); | |
1265 | return p; | |
1266 | } | |
1267 | ||
8e274523 LP |
1268 | int unit_add_cgroup(Unit *u, CGroupBonding *b) { |
1269 | CGroupBonding *l; | |
1270 | int r; | |
1271 | ||
1272 | assert(u); | |
1273 | assert(b); | |
1274 | assert(b->path); | |
1275 | ||
1276 | /* Ensure this hasn't been added yet */ | |
1277 | assert(!b->unit); | |
1278 | ||
1279 | l = hashmap_get(u->meta.manager->cgroup_bondings, b->path); | |
1280 | LIST_PREPEND(CGroupBonding, by_path, l, b); | |
1281 | ||
1282 | if ((r = hashmap_replace(u->meta.manager->cgroup_bondings, b->path, l)) < 0) { | |
1283 | LIST_REMOVE(CGroupBonding, by_path, l, b); | |
1284 | return r; | |
1285 | } | |
1286 | ||
1287 | LIST_PREPEND(CGroupBonding, by_unit, u->meta.cgroup_bondings, b); | |
1288 | b->unit = u; | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | int unit_add_cgroup_from_text(Unit *u, const char *name) { | |
1294 | size_t n; | |
1295 | const char *p; | |
1296 | char *controller; | |
1297 | CGroupBonding *b; | |
1298 | int r; | |
1299 | ||
1300 | assert(u); | |
1301 | assert(name); | |
1302 | ||
1303 | /* Detect controller name */ | |
1304 | n = strcspn(name, ":/"); | |
1305 | ||
1306 | /* Only controller name, no path? No path? */ | |
1307 | if (name[n] == 0) | |
1308 | return -EINVAL; | |
1309 | ||
1310 | if (n > 0) { | |
1311 | if (name[n] != ':') | |
1312 | return -EINVAL; | |
1313 | ||
1314 | p = name+n+1; | |
1315 | } else | |
1316 | p = name; | |
1317 | ||
1318 | /* Insist in absolute paths */ | |
1319 | if (p[0] != '/') | |
1320 | return -EINVAL; | |
1321 | ||
1322 | if (!(controller = strndup(name, n))) | |
1323 | return -ENOMEM; | |
1324 | ||
1325 | if (cgroup_bonding_find_list(u->meta.cgroup_bondings, controller)) { | |
1326 | free(controller); | |
1327 | return -EEXIST; | |
1328 | } | |
1329 | ||
1330 | if (!(b = new0(CGroupBonding, 1))) { | |
1331 | free(controller); | |
1332 | return -ENOMEM; | |
1333 | } | |
1334 | ||
1335 | b->controller = controller; | |
1336 | ||
1337 | if (!(b->path = strdup(p))) { | |
1338 | r = -ENOMEM; | |
1339 | goto fail; | |
1340 | } | |
1341 | ||
1342 | b->only_us = false; | |
1343 | b->clean_up = false; | |
1344 | ||
1345 | if ((r = unit_add_cgroup(u, b)) < 0) | |
1346 | goto fail; | |
1347 | ||
1348 | return 0; | |
1349 | ||
1350 | fail: | |
1351 | free(b->path); | |
1352 | free(b->controller); | |
1353 | free(b); | |
1354 | ||
1355 | return r; | |
1356 | } | |
1357 | ||
1358 | int unit_add_default_cgroup(Unit *u) { | |
1359 | CGroupBonding *b; | |
1360 | int r = -ENOMEM; | |
1361 | ||
1362 | assert(u); | |
1363 | ||
1364 | /* Adds in the default cgroup data, if it wasn't specified yet */ | |
1365 | ||
1366 | if (unit_get_default_cgroup(u)) | |
1367 | return 0; | |
1368 | ||
1369 | if (!(b = new0(CGroupBonding, 1))) | |
1370 | return -ENOMEM; | |
1371 | ||
1372 | if (!(b->controller = strdup(u->meta.manager->cgroup_controller))) | |
1373 | goto fail; | |
1374 | ||
1375 | if (asprintf(&b->path, "%s/%s", u->meta.manager->cgroup_hierarchy, unit_id(u)) < 0) | |
1376 | goto fail; | |
1377 | ||
1378 | b->clean_up = true; | |
1379 | b->only_us = true; | |
1380 | ||
1381 | if ((r = unit_add_cgroup(u, b)) < 0) | |
1382 | goto fail; | |
1383 | ||
1384 | return 0; | |
1385 | ||
1386 | fail: | |
1387 | free(b->path); | |
1388 | free(b->controller); | |
1389 | free(b); | |
1390 | ||
1391 | return r; | |
1392 | } | |
1393 | ||
1394 | CGroupBonding* unit_get_default_cgroup(Unit *u) { | |
1395 | assert(u); | |
1396 | ||
1397 | return cgroup_bonding_find_list(u->meta.cgroup_bondings, u->meta.manager->cgroup_controller); | |
1398 | } | |
1399 | ||
94f04347 LP |
1400 | static const char* const unit_type_table[_UNIT_TYPE_MAX] = { |
1401 | [UNIT_SERVICE] = "service", | |
1402 | [UNIT_TIMER] = "timer", | |
1403 | [UNIT_SOCKET] = "socket", | |
1404 | [UNIT_TARGET] = "target", | |
1405 | [UNIT_DEVICE] = "device", | |
1406 | [UNIT_MOUNT] = "mount", | |
1407 | [UNIT_AUTOMOUNT] = "automount", | |
1408 | [UNIT_SNAPSHOT] = "snapshot" | |
1409 | }; | |
1410 | ||
1411 | DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType); | |
1412 | ||
1413 | static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = { | |
1414 | [UNIT_STUB] = "stub", | |
1415 | [UNIT_LOADED] = "loaded", | |
23a177ef LP |
1416 | [UNIT_FAILED] = "failed", |
1417 | [UNIT_MERGED] = "merged" | |
94f04347 LP |
1418 | }; |
1419 | ||
1420 | DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState); | |
1421 | ||
1422 | static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = { | |
1423 | [UNIT_ACTIVE] = "active", | |
1424 | [UNIT_INACTIVE] = "inactive", | |
1425 | [UNIT_ACTIVATING] = "activating", | |
1426 | [UNIT_DEACTIVATING] = "deactivating" | |
1427 | }; | |
1428 | ||
1429 | DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState); | |
1430 | ||
1431 | static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = { | |
1432 | [UNIT_REQUIRES] = "Requires", | |
1433 | [UNIT_SOFT_REQUIRES] = "SoftRequires", | |
1434 | [UNIT_WANTS] = "Wants", | |
1435 | [UNIT_REQUISITE] = "Requisite", | |
1436 | [UNIT_SOFT_REQUISITE] = "SoftRequisite", | |
1437 | [UNIT_REQUIRED_BY] = "RequiredBy", | |
1438 | [UNIT_SOFT_REQUIRED_BY] = "SoftRequiredBy", | |
1439 | [UNIT_WANTED_BY] = "WantedBy", | |
1440 | [UNIT_CONFLICTS] = "Conflicts", | |
1441 | [UNIT_BEFORE] = "Before", | |
1442 | [UNIT_AFTER] = "After", | |
1443 | }; | |
1444 | ||
1445 | DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency); | |
50159e6a LP |
1446 | |
1447 | static const char* const kill_mode_table[_KILL_MODE_MAX] = { | |
1448 | [KILL_PROCESS] = "process", | |
1449 | [KILL_PROCESS_GROUP] = "process-group", | |
1450 | [KILL_CONTROL_GROUP] = "control-group" | |
1451 | }; | |
1452 | ||
1453 | DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode); |