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60918275 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 | ||
60918275 LP |
22 | #include <assert.h> |
23 | #include <errno.h> | |
87d1515d | 24 | #include <string.h> |
9152c765 LP |
25 | #include <sys/epoll.h> |
26 | #include <signal.h> | |
27 | #include <sys/signalfd.h> | |
28 | #include <sys/wait.h> | |
29 | #include <unistd.h> | |
30 | #include <sys/poll.h> | |
60918275 LP |
31 | |
32 | #include "manager.h" | |
33 | #include "hashmap.h" | |
34 | #include "macro.h" | |
35 | #include "strv.h" | |
16354eff | 36 | #include "log.h" |
2a987ee8 | 37 | #include "util.h" |
ea430986 | 38 | #include "ratelimit.h" |
60918275 | 39 | |
ce578209 | 40 | static int manager_setup_signals(Manager *m) { |
9152c765 LP |
41 | sigset_t mask; |
42 | struct epoll_event ev; | |
60918275 | 43 | |
ce578209 LP |
44 | assert(m); |
45 | ||
46 | assert_se(reset_all_signal_handlers() == 0); | |
47 | ||
48 | assert_se(sigemptyset(&mask) == 0); | |
49 | assert_se(sigaddset(&mask, SIGCHLD) == 0); | |
50 | assert_se(sigaddset(&mask, SIGINT) == 0); /* Kernel sends us this on control-alt-del */ | |
51 | assert_se(sigaddset(&mask, SIGWINCH) == 0); /* Kernel sends us this on kbrequest (alt-arrowup) */ | |
52 | assert_se(sigaddset(&mask, SIGTERM) == 0); | |
53 | assert_se(sigaddset(&mask, SIGHUP) == 0); | |
54 | assert_se(sigaddset(&mask, SIGUSR1) == 0); | |
55 | assert_se(sigaddset(&mask, SIGUSR2) == 0); | |
56 | assert_se(sigaddset(&mask, SIGPIPE) == 0); | |
57 | assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); | |
58 | ||
ef734fd6 | 59 | m->signal_watch.type = WATCH_SIGNAL; |
ce578209 LP |
60 | if ((m->signal_watch.fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) |
61 | return -errno; | |
62 | ||
63 | zero(ev); | |
64 | ev.events = EPOLLIN; | |
65 | ev.data.ptr = &m->signal_watch; | |
66 | ||
67 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0) | |
68 | return -errno; | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
ce578209 LP |
73 | Manager* manager_new(void) { |
74 | Manager *m; | |
75 | ||
60918275 LP |
76 | if (!(m = new0(Manager, 1))) |
77 | return NULL; | |
78 | ||
f94ea366 | 79 | m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = -1; |
ea430986 | 80 | m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */ |
9152c765 | 81 | |
87f0e418 | 82 | if (!(m->units = hashmap_new(string_hash_func, string_compare_func))) |
60918275 LP |
83 | goto fail; |
84 | ||
85 | if (!(m->jobs = hashmap_new(trivial_hash_func, trivial_compare_func))) | |
86 | goto fail; | |
87 | ||
e5b5ae50 | 88 | if (!(m->transaction_jobs = hashmap_new(trivial_hash_func, trivial_compare_func))) |
60918275 LP |
89 | goto fail; |
90 | ||
9152c765 LP |
91 | if (!(m->watch_pids = hashmap_new(trivial_hash_func, trivial_compare_func))) |
92 | goto fail; | |
93 | ||
94 | if ((m->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) | |
95 | goto fail; | |
96 | ||
ce578209 | 97 | if (manager_setup_signals(m) < 0) |
9152c765 LP |
98 | goto fail; |
99 | ||
ea430986 LP |
100 | /* FIXME: this should be called only when the D-Bus bus daemon is running */ |
101 | if (bus_init(m) < 0) | |
102 | goto fail; | |
103 | ||
60918275 LP |
104 | return m; |
105 | ||
106 | fail: | |
107 | manager_free(m); | |
108 | return NULL; | |
109 | } | |
110 | ||
111 | void manager_free(Manager *m) { | |
7824bbeb | 112 | UnitType c; |
87f0e418 | 113 | Unit *u; |
e5b5ae50 | 114 | Job *j; |
60918275 LP |
115 | |
116 | assert(m); | |
117 | ||
87f0e418 | 118 | while ((j = hashmap_first(m->transaction_jobs))) |
e5b5ae50 LP |
119 | job_free(j); |
120 | ||
87f0e418 LP |
121 | while ((u = hashmap_first(m->units))) |
122 | unit_free(u); | |
123 | ||
7824bbeb LP |
124 | for (c = 0; c < _UNIT_TYPE_MAX; c++) |
125 | if (unit_vtable[c]->shutdown) | |
126 | unit_vtable[c]->shutdown(m); | |
127 | ||
ea430986 LP |
128 | bus_done(m); |
129 | ||
87f0e418 | 130 | hashmap_free(m->units); |
60918275 | 131 | hashmap_free(m->jobs); |
e5b5ae50 | 132 | hashmap_free(m->transaction_jobs); |
9152c765 LP |
133 | hashmap_free(m->watch_pids); |
134 | ||
135 | if (m->epoll_fd >= 0) | |
136 | close_nointr(m->epoll_fd); | |
acbb0225 LP |
137 | if (m->signal_watch.fd >= 0) |
138 | close_nointr(m->signal_watch.fd); | |
60918275 LP |
139 | |
140 | free(m); | |
141 | } | |
142 | ||
f50e0a01 LP |
143 | int manager_coldplug(Manager *m) { |
144 | int r; | |
145 | UnitType c; | |
146 | Iterator i; | |
147 | Unit *u; | |
148 | char *k; | |
149 | ||
150 | assert(m); | |
151 | ||
152 | /* First, let's ask every type to load all units from | |
153 | * disk/kernel that it might know */ | |
154 | for (c = 0; c < _UNIT_TYPE_MAX; c++) | |
155 | if (unit_vtable[c]->enumerate) | |
156 | if ((r = unit_vtable[c]->enumerate(m)) < 0) | |
157 | return r; | |
158 | ||
159 | manager_dispatch_load_queue(m); | |
160 | ||
161 | /* Then, let's set up their initial state. */ | |
162 | HASHMAP_FOREACH_KEY(u, k, m->units, i) { | |
163 | ||
164 | /* ignore aliases */ | |
165 | if (unit_id(u) != k) | |
166 | continue; | |
167 | ||
168 | if (UNIT_VTABLE(u)->coldplug) | |
169 | if ((r = UNIT_VTABLE(u)->coldplug(u)) < 0) | |
170 | return r; | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
302d0040 LP |
176 | static void transaction_delete_job(Manager *m, Job *j) { |
177 | assert(m); | |
178 | assert(j); | |
179 | ||
1ffba6fe LP |
180 | /* Deletes one job from the transaction */ |
181 | ||
302d0040 LP |
182 | manager_transaction_unlink_job(m, j); |
183 | ||
ac1135be | 184 | if (!j->installed) |
302d0040 LP |
185 | job_free(j); |
186 | } | |
187 | ||
87f0e418 | 188 | static void transaction_delete_unit(Manager *m, Unit *u) { |
1ffba6fe LP |
189 | Job *j; |
190 | ||
87f0e418 | 191 | /* Deletes all jobs associated with a certain unit from the |
1ffba6fe LP |
192 | * transaction */ |
193 | ||
87f0e418 | 194 | while ((j = hashmap_get(m->transaction_jobs, u))) |
1ffba6fe LP |
195 | transaction_delete_job(m, j); |
196 | } | |
197 | ||
f04fa1d5 LP |
198 | static void transaction_clean_dependencies(Manager *m) { |
199 | Iterator i; | |
200 | Job *j; | |
201 | ||
202 | assert(m); | |
203 | ||
204 | /* Drops all dependencies of all installed jobs */ | |
205 | ||
206 | HASHMAP_FOREACH(j, m->jobs, i) { | |
207 | while (j->subject_list) | |
208 | job_dependency_free(j->subject_list); | |
209 | while (j->object_list) | |
210 | job_dependency_free(j->object_list); | |
211 | } | |
212 | ||
213 | assert(!m->transaction_anchor); | |
214 | } | |
215 | ||
11dd41ce LP |
216 | static void transaction_abort(Manager *m) { |
217 | Job *j; | |
218 | ||
219 | assert(m); | |
11dd41ce | 220 | |
e5b5ae50 | 221 | while ((j = hashmap_first(m->transaction_jobs))) |
ac1135be | 222 | if (j->installed) |
302d0040 | 223 | transaction_delete_job(m, j); |
e5b5ae50 LP |
224 | else |
225 | job_free(j); | |
226 | ||
227 | assert(hashmap_isempty(m->transaction_jobs)); | |
f04fa1d5 LP |
228 | |
229 | transaction_clean_dependencies(m); | |
e5b5ae50 LP |
230 | } |
231 | ||
232 | static void transaction_find_jobs_that_matter_to_anchor(Manager *m, Job *j, unsigned generation) { | |
233 | JobDependency *l; | |
234 | ||
235 | assert(m); | |
236 | ||
87f0e418 | 237 | /* A recursive sweep through the graph that marks all units |
1ffba6fe LP |
238 | * that matter to the anchor job, i.e. are directly or |
239 | * indirectly a dependency of the anchor job via paths that | |
240 | * are fully marked as mattering. */ | |
241 | ||
44d8db9e LP |
242 | if (j) |
243 | l = j->subject_list; | |
244 | else | |
245 | l = m->transaction_anchor; | |
246 | ||
247 | LIST_FOREACH(subject, l, l) { | |
e5b5ae50 LP |
248 | |
249 | /* This link does not matter */ | |
250 | if (!l->matters) | |
251 | continue; | |
252 | ||
87f0e418 | 253 | /* This unit has already been marked */ |
e5b5ae50 LP |
254 | if (l->object->generation == generation) |
255 | continue; | |
256 | ||
257 | l->object->matters_to_anchor = true; | |
258 | l->object->generation = generation; | |
259 | ||
260 | transaction_find_jobs_that_matter_to_anchor(m, l->object, generation); | |
261 | } | |
262 | } | |
263 | ||
7fad411c | 264 | static void transaction_merge_and_delete_job(Manager *m, Job *j, Job *other, JobType t) { |
e5b5ae50 LP |
265 | JobDependency *l, *last; |
266 | ||
267 | assert(j); | |
268 | assert(other); | |
87f0e418 | 269 | assert(j->unit == other->unit); |
ac1135be | 270 | assert(!j->installed); |
e5b5ae50 | 271 | |
1ffba6fe LP |
272 | /* Merges 'other' into 'j' and then deletes j. */ |
273 | ||
e5b5ae50 LP |
274 | j->type = t; |
275 | j->state = JOB_WAITING; | |
5cb5a6ff | 276 | j->forced = j->forced || other->forced; |
e5b5ae50 LP |
277 | |
278 | j->matters_to_anchor = j->matters_to_anchor || other->matters_to_anchor; | |
279 | ||
280 | /* Patch us in as new owner of the JobDependency objects */ | |
281 | last = NULL; | |
44d8db9e | 282 | LIST_FOREACH(subject, l, other->subject_list) { |
e5b5ae50 LP |
283 | assert(l->subject == other); |
284 | l->subject = j; | |
285 | last = l; | |
286 | } | |
287 | ||
288 | /* Merge both lists */ | |
289 | if (last) { | |
290 | last->subject_next = j->subject_list; | |
291 | if (j->subject_list) | |
292 | j->subject_list->subject_prev = last; | |
293 | j->subject_list = other->subject_list; | |
294 | } | |
295 | ||
296 | /* Patch us in as new owner of the JobDependency objects */ | |
297 | last = NULL; | |
44d8db9e | 298 | LIST_FOREACH(object, l, other->object_list) { |
e5b5ae50 LP |
299 | assert(l->object == other); |
300 | l->object = j; | |
301 | last = l; | |
302 | } | |
303 | ||
304 | /* Merge both lists */ | |
305 | if (last) { | |
306 | last->object_next = j->object_list; | |
307 | if (j->object_list) | |
308 | j->object_list->object_prev = last; | |
309 | j->object_list = other->object_list; | |
310 | } | |
311 | ||
e5b5ae50 LP |
312 | /* Kill the other job */ |
313 | other->subject_list = NULL; | |
314 | other->object_list = NULL; | |
302d0040 | 315 | transaction_delete_job(m, other); |
e5b5ae50 LP |
316 | } |
317 | ||
5cb5a6ff | 318 | static int delete_one_unmergeable_job(Manager *m, Job *j) { |
1ffba6fe LP |
319 | Job *k; |
320 | ||
321 | assert(j); | |
322 | ||
323 | /* Tries to delete one item in the linked list | |
324 | * j->transaction_next->transaction_next->... that conflicts | |
325 | * whith another one, in an attempt to make an inconsistent | |
326 | * transaction work. */ | |
327 | ||
328 | /* We rely here on the fact that if a merged with b does not | |
329 | * merge with c, either a or b merge with c neither */ | |
034c6ed7 LP |
330 | LIST_FOREACH(transaction, j, j) |
331 | LIST_FOREACH(transaction, k, j->transaction_next) { | |
1ffba6fe LP |
332 | Job *d; |
333 | ||
334 | /* Is this one mergeable? Then skip it */ | |
5cb5a6ff | 335 | if (job_type_is_mergeable(j->type, k->type)) |
1ffba6fe LP |
336 | continue; |
337 | ||
338 | /* Ok, we found two that conflict, let's see if we can | |
339 | * drop one of them */ | |
340 | if (!j->matters_to_anchor) | |
341 | d = j; | |
342 | else if (!k->matters_to_anchor) | |
343 | d = k; | |
344 | else | |
345 | return -ENOEXEC; | |
346 | ||
347 | /* Ok, we can drop one, so let's do so. */ | |
87f0e418 | 348 | log_debug("Try to fix job merging by deleting job %s/%s", unit_id(d->unit), job_type_to_string(d->type)); |
1ffba6fe LP |
349 | transaction_delete_job(m, d); |
350 | return 0; | |
351 | } | |
352 | ||
353 | return -EINVAL; | |
354 | } | |
355 | ||
e5b5ae50 | 356 | static int transaction_merge_jobs(Manager *m) { |
11dd41ce | 357 | Job *j; |
034c6ed7 | 358 | Iterator i; |
e5b5ae50 LP |
359 | int r; |
360 | ||
361 | assert(m); | |
362 | ||
1ffba6fe LP |
363 | /* First step, check whether any of the jobs for one specific |
364 | * task conflict. If so, try to drop one of them. */ | |
034c6ed7 | 365 | HASHMAP_FOREACH(j, m->transaction_jobs, i) { |
1ffba6fe LP |
366 | JobType t; |
367 | Job *k; | |
368 | ||
369 | t = j->type; | |
034c6ed7 | 370 | LIST_FOREACH(transaction, k, j->transaction_next) { |
1ffba6fe LP |
371 | if ((r = job_type_merge(&t, k->type)) >= 0) |
372 | continue; | |
373 | ||
374 | /* OK, we could not merge all jobs for this | |
375 | * action. Let's see if we can get rid of one | |
376 | * of them */ | |
377 | ||
5cb5a6ff | 378 | if ((r = delete_one_unmergeable_job(m, j)) >= 0) |
1ffba6fe LP |
379 | /* Ok, we managed to drop one, now |
380 | * let's ask our callers to call us | |
381 | * again after garbage collecting */ | |
382 | return -EAGAIN; | |
383 | ||
384 | /* We couldn't merge anything. Failure */ | |
385 | return r; | |
386 | } | |
387 | } | |
388 | ||
389 | /* Second step, merge the jobs. */ | |
034c6ed7 | 390 | HASHMAP_FOREACH(j, m->transaction_jobs, i) { |
e5b5ae50 LP |
391 | JobType t = j->type; |
392 | Job *k; | |
393 | ||
e094e853 | 394 | /* Merge all transactions */ |
034c6ed7 | 395 | LIST_FOREACH(transaction, k, j->transaction_next) |
1ffba6fe | 396 | assert_se(job_type_merge(&t, k->type) == 0); |
e5b5ae50 | 397 | |
5cb5a6ff | 398 | /* If an active job is mergeable, merge it too */ |
87f0e418 LP |
399 | if (j->unit->meta.job) |
400 | job_type_merge(&t, j->unit->meta.job->type); /* Might fail. Which is OK */ | |
e094e853 | 401 | |
e5b5ae50 | 402 | while ((k = j->transaction_next)) { |
ac1135be | 403 | if (j->installed) { |
7fad411c | 404 | transaction_merge_and_delete_job(m, k, j, t); |
e5b5ae50 LP |
405 | j = k; |
406 | } else | |
7fad411c | 407 | transaction_merge_and_delete_job(m, j, k, t); |
e5b5ae50 LP |
408 | } |
409 | ||
410 | assert(!j->transaction_next); | |
411 | assert(!j->transaction_prev); | |
412 | } | |
413 | ||
7fad411c | 414 | return 0; |
e5b5ae50 LP |
415 | } |
416 | ||
87f0e418 LP |
417 | static bool unit_matters_to_anchor(Unit *u, Job *j) { |
418 | assert(u); | |
1ffba6fe LP |
419 | assert(!j->transaction_prev); |
420 | ||
87f0e418 | 421 | /* Checks whether at least one of the jobs for this unit |
1ffba6fe LP |
422 | * matters to the anchor. */ |
423 | ||
034c6ed7 | 424 | LIST_FOREACH(transaction, j, j) |
1ffba6fe LP |
425 | if (j->matters_to_anchor) |
426 | return true; | |
427 | ||
428 | return false; | |
429 | } | |
430 | ||
e5b5ae50 | 431 | static int transaction_verify_order_one(Manager *m, Job *j, Job *from, unsigned generation) { |
034c6ed7 | 432 | Iterator i; |
87f0e418 | 433 | Unit *u; |
11dd41ce | 434 | int r; |
e5b5ae50 LP |
435 | |
436 | assert(m); | |
437 | assert(j); | |
1ffba6fe LP |
438 | assert(!j->transaction_prev); |
439 | ||
440 | /* Does a recursive sweep through the ordering graph, looking | |
441 | * for a cycle. If we find cycle we try to break it. */ | |
e5b5ae50 | 442 | |
7fad411c | 443 | /* Did we find a cycle? */ |
e5b5ae50 LP |
444 | if (j->marker && j->generation == generation) { |
445 | Job *k; | |
446 | ||
447 | /* So, we already have been here. We have a | |
1ffba6fe LP |
448 | * cycle. Let's try to break it. We go backwards in |
449 | * our path and try to find a suitable job to | |
450 | * remove. We use the marker to find our way back, | |
451 | * since smart how we are we stored our way back in | |
452 | * there. */ | |
e5b5ae50 | 453 | |
9f04bd52 LP |
454 | log_debug("Found cycle on %s/%s", unit_id(j->unit), job_type_to_string(j->type)); |
455 | ||
e5b5ae50 | 456 | for (k = from; k; k = (k->generation == generation ? k->marker : NULL)) { |
1ffba6fe | 457 | |
9f04bd52 LP |
458 | log_debug("Walked on cycle path to %s/%s", unit_id(j->unit), job_type_to_string(j->type)); |
459 | ||
ac1135be | 460 | if (!k->installed && |
87f0e418 | 461 | !unit_matters_to_anchor(k->unit, k)) { |
1ffba6fe LP |
462 | /* Ok, we can drop this one, so let's |
463 | * do so. */ | |
87f0e418 LP |
464 | log_debug("Breaking order cycle by deleting job %s/%s", unit_id(k->unit), job_type_to_string(k->type)); |
465 | transaction_delete_unit(m, k->unit); | |
e5b5ae50 LP |
466 | return -EAGAIN; |
467 | } | |
468 | ||
469 | /* Check if this in fact was the beginning of | |
7fad411c | 470 | * the cycle */ |
e5b5ae50 LP |
471 | if (k == j) |
472 | break; | |
473 | } | |
474 | ||
9f04bd52 LP |
475 | log_debug("Unable to break cycle"); |
476 | ||
1ffba6fe | 477 | return -ENOEXEC; |
e5b5ae50 LP |
478 | } |
479 | ||
1ffba6fe LP |
480 | /* Make the marker point to where we come from, so that we can |
481 | * find our way backwards if we want to break a cycle */ | |
e5b5ae50 LP |
482 | j->marker = from; |
483 | j->generation = generation; | |
484 | ||
1ffba6fe | 485 | /* We assume that the the dependencies are bidirectional, and |
87f0e418 LP |
486 | * hence can ignore UNIT_AFTER */ |
487 | SET_FOREACH(u, j->unit->meta.dependencies[UNIT_BEFORE], i) { | |
e5b5ae50 LP |
488 | Job *o; |
489 | ||
87f0e418 LP |
490 | /* Is there a job for this unit? */ |
491 | if (!(o = hashmap_get(m->transaction_jobs, u))) | |
1ffba6fe LP |
492 | |
493 | /* Ok, there is no job for this in the | |
494 | * transaction, but maybe there is already one | |
495 | * running? */ | |
87f0e418 | 496 | if (!(o = u->meta.job)) |
e5b5ae50 LP |
497 | continue; |
498 | ||
499 | if ((r = transaction_verify_order_one(m, o, j, generation)) < 0) | |
500 | return r; | |
501 | } | |
502 | ||
9f04bd52 LP |
503 | /* Ok, let's backtrack, and remember that this entry is not on |
504 | * our path anymore. */ | |
505 | j->marker = NULL; | |
506 | ||
e5b5ae50 LP |
507 | return 0; |
508 | } | |
509 | ||
510 | static int transaction_verify_order(Manager *m, unsigned *generation) { | |
1ffba6fe LP |
511 | Job *j; |
512 | int r; | |
034c6ed7 | 513 | Iterator i; |
1ffba6fe | 514 | |
e5b5ae50 LP |
515 | assert(m); |
516 | assert(generation); | |
517 | ||
1ffba6fe LP |
518 | /* Check if the ordering graph is cyclic. If it is, try to fix |
519 | * that up by dropping one of the jobs. */ | |
e5b5ae50 | 520 | |
034c6ed7 | 521 | HASHMAP_FOREACH(j, m->transaction_jobs, i) |
1ffba6fe LP |
522 | if ((r = transaction_verify_order_one(m, j, NULL, (*generation)++)) < 0) |
523 | return r; | |
e5b5ae50 LP |
524 | |
525 | return 0; | |
526 | } | |
527 | ||
528 | static void transaction_collect_garbage(Manager *m) { | |
529 | bool again; | |
530 | ||
531 | assert(m); | |
532 | ||
1ffba6fe LP |
533 | /* Drop jobs that are not required by any other job */ |
534 | ||
e5b5ae50 | 535 | do { |
034c6ed7 | 536 | Iterator i; |
e5b5ae50 LP |
537 | Job *j; |
538 | ||
539 | again = false; | |
540 | ||
034c6ed7 | 541 | HASHMAP_FOREACH(j, m->transaction_jobs, i) { |
e5b5ae50 LP |
542 | if (j->object_list) |
543 | continue; | |
544 | ||
87f0e418 | 545 | log_debug("Garbage collecting job %s/%s", unit_id(j->unit), job_type_to_string(j->type)); |
302d0040 | 546 | transaction_delete_job(m, j); |
e5b5ae50 LP |
547 | again = true; |
548 | break; | |
549 | } | |
550 | ||
551 | } while (again); | |
552 | } | |
553 | ||
554 | static int transaction_is_destructive(Manager *m, JobMode mode) { | |
034c6ed7 | 555 | Iterator i; |
e5b5ae50 | 556 | Job *j; |
11dd41ce LP |
557 | |
558 | assert(m); | |
11dd41ce | 559 | |
e5b5ae50 LP |
560 | /* Checks whether applying this transaction means that |
561 | * existing jobs would be replaced */ | |
11dd41ce | 562 | |
034c6ed7 | 563 | HASHMAP_FOREACH(j, m->transaction_jobs, i) { |
e094e853 LP |
564 | |
565 | /* Assume merged */ | |
566 | assert(!j->transaction_prev); | |
567 | assert(!j->transaction_next); | |
568 | ||
87f0e418 LP |
569 | if (j->unit->meta.job && |
570 | j->unit->meta.job != j && | |
571 | !job_type_is_superset(j->type, j->unit->meta.job->type)) | |
e5b5ae50 | 572 | return -EEXIST; |
e094e853 | 573 | } |
11dd41ce | 574 | |
e5b5ae50 LP |
575 | return 0; |
576 | } | |
577 | ||
e094e853 LP |
578 | static void transaction_minimize_impact(Manager *m) { |
579 | bool again; | |
580 | assert(m); | |
581 | ||
582 | /* Drops all unnecessary jobs that reverse already active jobs | |
583 | * or that stop a running service. */ | |
584 | ||
585 | do { | |
586 | Job *j; | |
034c6ed7 | 587 | Iterator i; |
e094e853 LP |
588 | |
589 | again = false; | |
590 | ||
034c6ed7 LP |
591 | HASHMAP_FOREACH(j, m->transaction_jobs, i) { |
592 | LIST_FOREACH(transaction, j, j) { | |
c20cae32 | 593 | bool stops_running_service, changes_existing_job; |
e094e853 LP |
594 | |
595 | /* If it matters, we shouldn't drop it */ | |
596 | if (j->matters_to_anchor) | |
597 | continue; | |
598 | ||
599 | /* Would this stop a running service? | |
600 | * Would this change an existing job? | |
601 | * If so, let's drop this entry */ | |
c20cae32 LP |
602 | |
603 | stops_running_service = | |
604 | j->type == JOB_STOP && UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(j->unit)); | |
605 | ||
606 | changes_existing_job = | |
607 | j->unit->meta.job && job_type_is_conflicting(j->type, j->unit->meta.job->state); | |
608 | ||
609 | if (!stops_running_service && !changes_existing_job) | |
e094e853 LP |
610 | continue; |
611 | ||
c20cae32 LP |
612 | if (stops_running_service) |
613 | log_debug("%s/%s would stop a running service.", unit_id(j->unit), job_type_to_string(j->type)); | |
614 | ||
615 | if (changes_existing_job) | |
616 | log_debug("%s/%s would change existing job.", unit_id(j->unit), job_type_to_string(j->type)); | |
617 | ||
e094e853 | 618 | /* Ok, let's get rid of this */ |
c20cae32 LP |
619 | log_debug("Deleting %s/%s to minimize impact.", unit_id(j->unit), job_type_to_string(j->type)); |
620 | ||
e094e853 LP |
621 | transaction_delete_job(m, j); |
622 | again = true; | |
623 | break; | |
624 | } | |
625 | ||
626 | if (again) | |
627 | break; | |
628 | } | |
629 | ||
630 | } while (again); | |
631 | } | |
632 | ||
e5b5ae50 | 633 | static int transaction_apply(Manager *m, JobMode mode) { |
034c6ed7 | 634 | Iterator i; |
e5b5ae50 LP |
635 | Job *j; |
636 | int r; | |
637 | ||
1ffba6fe LP |
638 | /* Moves the transaction jobs to the set of active jobs */ |
639 | ||
034c6ed7 | 640 | HASHMAP_FOREACH(j, m->transaction_jobs, i) { |
e094e853 LP |
641 | /* Assume merged */ |
642 | assert(!j->transaction_prev); | |
643 | assert(!j->transaction_next); | |
644 | ||
ac1135be | 645 | if (j->installed) |
e5b5ae50 LP |
646 | continue; |
647 | ||
648 | if ((r = hashmap_put(m->jobs, UINT32_TO_PTR(j->id), j)) < 0) | |
11dd41ce LP |
649 | goto rollback; |
650 | } | |
651 | ||
e5b5ae50 | 652 | while ((j = hashmap_steal_first(m->transaction_jobs))) { |
ac1135be | 653 | if (j->installed) |
e5b5ae50 LP |
654 | continue; |
655 | ||
87f0e418 LP |
656 | if (j->unit->meta.job) |
657 | job_free(j->unit->meta.job); | |
11dd41ce | 658 | |
87f0e418 | 659 | j->unit->meta.job = j; |
ac1135be | 660 | j->installed = true; |
11dd41ce | 661 | |
e5b5ae50 LP |
662 | /* We're fully installed. Now let's free data we don't |
663 | * need anymore. */ | |
664 | ||
665 | assert(!j->transaction_next); | |
666 | assert(!j->transaction_prev); | |
667 | ||
acbb0225 | 668 | job_schedule_run(j); |
01184e04 LP |
669 | } |
670 | ||
671 | /* As last step, kill all remaining job dependencies. */ | |
f04fa1d5 | 672 | transaction_clean_dependencies(m); |
1ffba6fe | 673 | |
11dd41ce LP |
674 | return 0; |
675 | ||
676 | rollback: | |
677 | ||
034c6ed7 | 678 | HASHMAP_FOREACH(j, m->transaction_jobs, i) { |
ac1135be | 679 | if (j->installed) |
e5b5ae50 LP |
680 | continue; |
681 | ||
682 | hashmap_remove(m->jobs, UINT32_TO_PTR(j->id)); | |
683 | } | |
684 | ||
685 | return r; | |
686 | } | |
687 | ||
e5b5ae50 LP |
688 | static int transaction_activate(Manager *m, JobMode mode) { |
689 | int r; | |
690 | unsigned generation = 1; | |
691 | ||
692 | assert(m); | |
693 | ||
694 | /* This applies the changes recorded in transaction_jobs to | |
695 | * the actual list of jobs, if possible. */ | |
696 | ||
697 | /* First step: figure out which jobs matter */ | |
698 | transaction_find_jobs_that_matter_to_anchor(m, NULL, generation++); | |
699 | ||
e094e853 LP |
700 | /* Second step: Try not to stop any running services if |
701 | * we don't have to. Don't try to reverse running | |
702 | * jobs if we don't have to. */ | |
703 | transaction_minimize_impact(m); | |
704 | ||
1ffba6fe | 705 | for (;;) { |
e094e853 | 706 | /* Third step: Let's remove unneeded jobs that might |
1ffba6fe LP |
707 | * be lurking. */ |
708 | transaction_collect_garbage(m); | |
e5b5ae50 | 709 | |
e094e853 | 710 | /* Fourth step: verify order makes sense and correct |
1ffba6fe LP |
711 | * cycles if necessary and possible */ |
712 | if ((r = transaction_verify_order(m, &generation)) >= 0) | |
713 | break; | |
e5b5ae50 | 714 | |
9f04bd52 LP |
715 | if (r != -EAGAIN) { |
716 | log_debug("Requested transaction contains an unfixable cyclic ordering dependency: %s", strerror(-r)); | |
1ffba6fe | 717 | goto rollback; |
9f04bd52 | 718 | } |
e5b5ae50 | 719 | |
1ffba6fe LP |
720 | /* Let's see if the resulting transaction ordering |
721 | * graph is still cyclic... */ | |
722 | } | |
723 | ||
724 | for (;;) { | |
5cb5a6ff | 725 | /* Fifth step: let's drop unmergeable entries if |
1ffba6fe LP |
726 | * necessary and possible, merge entries we can |
727 | * merge */ | |
728 | if ((r = transaction_merge_jobs(m)) >= 0) | |
729 | break; | |
730 | ||
9f04bd52 LP |
731 | if (r != -EAGAIN) { |
732 | log_debug("Requested transaction contains unmergable jobs: %s", strerror(-r)); | |
1ffba6fe | 733 | goto rollback; |
9f04bd52 | 734 | } |
1ffba6fe | 735 | |
e094e853 | 736 | /* Sixth step: an entry got dropped, let's garbage |
1ffba6fe LP |
737 | * collect its dependencies. */ |
738 | transaction_collect_garbage(m); | |
739 | ||
740 | /* Let's see if the resulting transaction still has | |
5cb5a6ff | 741 | * unmergeable entries ... */ |
1ffba6fe LP |
742 | } |
743 | ||
e094e853 | 744 | /* Seventh step: check whether we can actually apply this */ |
e5b5ae50 | 745 | if (mode == JOB_FAIL) |
9f04bd52 LP |
746 | if ((r = transaction_is_destructive(m, mode)) < 0) { |
747 | log_debug("Requested transaction contradicts existing jobs: %s", strerror(-r)); | |
e5b5ae50 | 748 | goto rollback; |
9f04bd52 | 749 | } |
e5b5ae50 | 750 | |
e094e853 | 751 | /* Eights step: apply changes */ |
9f04bd52 LP |
752 | if ((r = transaction_apply(m, mode)) < 0) { |
753 | log_debug("Failed to apply transaction: %s", strerror(-r)); | |
e5b5ae50 | 754 | goto rollback; |
9f04bd52 | 755 | } |
e5b5ae50 LP |
756 | |
757 | assert(hashmap_isempty(m->transaction_jobs)); | |
758 | assert(!m->transaction_anchor); | |
759 | ||
760 | return 0; | |
11dd41ce | 761 | |
e5b5ae50 | 762 | rollback: |
11dd41ce LP |
763 | transaction_abort(m); |
764 | return r; | |
765 | } | |
766 | ||
87f0e418 | 767 | static Job* transaction_add_one_job(Manager *m, JobType type, Unit *unit, bool force, bool *is_new) { |
e5b5ae50 | 768 | Job *j, *f; |
60918275 LP |
769 | int r; |
770 | ||
771 | assert(m); | |
87f0e418 | 772 | assert(unit); |
60918275 | 773 | |
e5b5ae50 LP |
774 | /* Looks for an axisting prospective job and returns that. If |
775 | * it doesn't exist it is created and added to the prospective | |
776 | * jobs list. */ | |
60918275 | 777 | |
87f0e418 | 778 | f = hashmap_get(m->transaction_jobs, unit); |
60918275 | 779 | |
034c6ed7 | 780 | LIST_FOREACH(transaction, j, f) { |
87f0e418 | 781 | assert(j->unit == unit); |
60918275 | 782 | |
e5b5ae50 LP |
783 | if (j->type == type) { |
784 | if (is_new) | |
785 | *is_new = false; | |
786 | return j; | |
787 | } | |
788 | } | |
60918275 | 789 | |
87f0e418 LP |
790 | if (unit->meta.job && unit->meta.job->type == type) |
791 | j = unit->meta.job; | |
792 | else if (!(j = job_new(m, type, unit))) | |
e5b5ae50 | 793 | return NULL; |
60918275 | 794 | |
e5b5ae50 LP |
795 | j->generation = 0; |
796 | j->marker = NULL; | |
797 | j->matters_to_anchor = false; | |
5cb5a6ff | 798 | j->forced = force; |
60918275 | 799 | |
034c6ed7 LP |
800 | LIST_PREPEND(Job, transaction, f, j); |
801 | ||
87f0e418 | 802 | if ((r = hashmap_replace(m->transaction_jobs, unit, f)) < 0) { |
034c6ed7 LP |
803 | job_free(j); |
804 | return NULL; | |
805 | } | |
806 | ||
e5b5ae50 LP |
807 | if (is_new) |
808 | *is_new = true; | |
60918275 | 809 | |
e5b5ae50 LP |
810 | return j; |
811 | } | |
11dd41ce | 812 | |
302d0040 | 813 | void manager_transaction_unlink_job(Manager *m, Job *j) { |
e5b5ae50 LP |
814 | assert(m); |
815 | assert(j); | |
11dd41ce | 816 | |
e5b5ae50 LP |
817 | if (j->transaction_prev) |
818 | j->transaction_prev->transaction_next = j->transaction_next; | |
819 | else if (j->transaction_next) | |
87f0e418 | 820 | hashmap_replace(m->transaction_jobs, j->unit, j->transaction_next); |
e5b5ae50 | 821 | else |
87f0e418 | 822 | hashmap_remove_value(m->transaction_jobs, j->unit, j); |
e5b5ae50 LP |
823 | |
824 | if (j->transaction_next) | |
825 | j->transaction_next->transaction_prev = j->transaction_prev; | |
826 | ||
827 | j->transaction_prev = j->transaction_next = NULL; | |
828 | ||
829 | while (j->subject_list) | |
830 | job_dependency_free(j->subject_list); | |
1e198baf LP |
831 | |
832 | while (j->object_list) { | |
833 | Job *other = j->object_list->matters ? j->object_list->subject : NULL; | |
834 | ||
e5b5ae50 | 835 | job_dependency_free(j->object_list); |
1e198baf LP |
836 | |
837 | if (other) { | |
5cb5a6ff | 838 | log_debug("Deleting job %s/%s as dependency of job %s/%s", |
87f0e418 LP |
839 | unit_id(other->unit), job_type_to_string(other->type), |
840 | unit_id(j->unit), job_type_to_string(j->type)); | |
302d0040 | 841 | transaction_delete_job(m, other); |
1e198baf LP |
842 | } |
843 | } | |
e5b5ae50 LP |
844 | } |
845 | ||
87f0e418 | 846 | static int transaction_add_job_and_dependencies(Manager *m, JobType type, Unit *unit, Job *by, bool matters, bool force, Job **_ret) { |
e5b5ae50 | 847 | Job *ret; |
034c6ed7 | 848 | Iterator i; |
87f0e418 | 849 | Unit *dep; |
e5b5ae50 LP |
850 | int r; |
851 | bool is_new; | |
852 | ||
853 | assert(m); | |
854 | assert(type < _JOB_TYPE_MAX); | |
87f0e418 | 855 | assert(unit); |
e5b5ae50 | 856 | |
87f0e418 | 857 | if (unit->meta.load_state != UNIT_LOADED) |
21b293e8 LP |
858 | return -EINVAL; |
859 | ||
87f0e418 | 860 | if (!unit_job_is_applicable(unit, type)) |
cd2dbd7d LP |
861 | return -EBADR; |
862 | ||
e5b5ae50 | 863 | /* First add the job. */ |
87f0e418 | 864 | if (!(ret = transaction_add_one_job(m, type, unit, force, &is_new))) |
e5b5ae50 LP |
865 | return -ENOMEM; |
866 | ||
867 | /* Then, add a link to the job. */ | |
868 | if (!job_dependency_new(by, ret, matters)) | |
869 | return -ENOMEM; | |
870 | ||
871 | if (is_new) { | |
872 | /* Finally, recursively add in all dependencies. */ | |
873 | if (type == JOB_START || type == JOB_RELOAD_OR_START) { | |
87f0e418 | 874 | SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRES], i) |
542563ba | 875 | if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, true, force, NULL)) < 0 && r != -EBADR) |
e5b5ae50 | 876 | goto fail; |
87f0e418 | 877 | SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_SOFT_REQUIRES], i) |
542563ba | 878 | if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, !force, force, NULL)) < 0 && r != -EBADR) |
e5b5ae50 | 879 | goto fail; |
87f0e418 | 880 | SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_WANTS], i) |
542563ba | 881 | if ((r = transaction_add_job_and_dependencies(m, JOB_START, dep, ret, false, force, NULL)) < 0 && r != -EBADR) |
e5b5ae50 | 882 | goto fail; |
87f0e418 | 883 | SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUISITE], i) |
542563ba | 884 | if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, true, force, NULL)) < 0 && r != -EBADR) |
e5b5ae50 | 885 | goto fail; |
87f0e418 | 886 | SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_SOFT_REQUISITE], i) |
542563ba | 887 | if ((r = transaction_add_job_and_dependencies(m, JOB_VERIFY_ACTIVE, dep, ret, !force, force, NULL)) < 0 && r != -EBADR) |
e5b5ae50 | 888 | goto fail; |
87f0e418 | 889 | SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_CONFLICTS], i) |
542563ba | 890 | if ((r = transaction_add_job_and_dependencies(m, JOB_STOP, dep, ret, true, force, NULL)) < 0 && r != -EBADR) |
e5b5ae50 LP |
891 | goto fail; |
892 | ||
893 | } else if (type == JOB_STOP || type == JOB_RESTART || type == JOB_TRY_RESTART) { | |
894 | ||
87f0e418 | 895 | SET_FOREACH(dep, ret->unit->meta.dependencies[UNIT_REQUIRED_BY], i) |
542563ba | 896 | if ((r = transaction_add_job_and_dependencies(m, type, dep, ret, true, force, NULL)) < 0 && r != -EBADR) |
e5b5ae50 LP |
897 | goto fail; |
898 | } | |
899 | ||
900 | /* JOB_VERIFY_STARTED, JOB_RELOAD require no dependency handling */ | |
901 | } | |
60918275 LP |
902 | |
903 | return 0; | |
904 | ||
905 | fail: | |
e5b5ae50 LP |
906 | return r; |
907 | } | |
908 | ||
87f0e418 | 909 | int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool force, Job **_ret) { |
e5b5ae50 LP |
910 | int r; |
911 | Job *ret; | |
912 | ||
913 | assert(m); | |
914 | assert(type < _JOB_TYPE_MAX); | |
87f0e418 | 915 | assert(unit); |
e5b5ae50 | 916 | assert(mode < _JOB_MODE_MAX); |
60918275 | 917 | |
9f04bd52 LP |
918 | log_debug("Trying to enqueue job %s/%s", unit_id(unit), job_type_to_string(type)); |
919 | ||
87f0e418 | 920 | if ((r = transaction_add_job_and_dependencies(m, type, unit, NULL, true, force, &ret))) { |
11dd41ce | 921 | transaction_abort(m); |
e5b5ae50 LP |
922 | return r; |
923 | } | |
11dd41ce | 924 | |
e5b5ae50 LP |
925 | if ((r = transaction_activate(m, mode)) < 0) |
926 | return r; | |
927 | ||
f50e0a01 LP |
928 | log_debug("Enqueued job %s/%s", unit_id(unit), job_type_to_string(type)); |
929 | ||
e5b5ae50 LP |
930 | if (_ret) |
931 | *_ret = ret; | |
60918275 | 932 | |
e5b5ae50 LP |
933 | return 0; |
934 | } | |
60918275 LP |
935 | |
936 | Job *manager_get_job(Manager *m, uint32_t id) { | |
937 | assert(m); | |
938 | ||
939 | return hashmap_get(m->jobs, UINT32_TO_PTR(id)); | |
940 | } | |
941 | ||
87f0e418 | 942 | Unit *manager_get_unit(Manager *m, const char *name) { |
60918275 LP |
943 | assert(m); |
944 | assert(name); | |
945 | ||
87f0e418 | 946 | return hashmap_get(m->units, name); |
60918275 LP |
947 | } |
948 | ||
f50e0a01 | 949 | void manager_dispatch_load_queue(Manager *m) { |
60918275 LP |
950 | Meta *meta; |
951 | ||
952 | assert(m); | |
953 | ||
223dabab LP |
954 | /* Make sure we are not run recursively */ |
955 | if (m->dispatching_load_queue) | |
034c6ed7 | 956 | return; |
223dabab LP |
957 | |
958 | m->dispatching_load_queue = true; | |
959 | ||
87f0e418 | 960 | /* Dispatches the load queue. Takes a unit from the queue and |
60918275 LP |
961 | * tries to load its data until the queue is empty */ |
962 | ||
963 | while ((meta = m->load_queue)) { | |
034c6ed7 LP |
964 | assert(meta->in_load_queue); |
965 | ||
87f0e418 | 966 | unit_load(UNIT(meta)); |
60918275 LP |
967 | } |
968 | ||
223dabab | 969 | m->dispatching_load_queue = false; |
60918275 LP |
970 | } |
971 | ||
0301abf4 | 972 | int manager_load_unit(Manager *m, const char *path, Unit **_ret) { |
87f0e418 | 973 | Unit *ret; |
60918275 | 974 | int r; |
0301abf4 | 975 | const char *name; |
60918275 LP |
976 | |
977 | assert(m); | |
0301abf4 | 978 | assert(path); |
60918275 | 979 | assert(_ret); |
60918275 | 980 | |
223dabab | 981 | /* This will load the service information files, but not actually |
0301abf4 LP |
982 | * start any services or anything. */ |
983 | ||
984 | name = file_name_from_path(path); | |
60918275 | 985 | |
87f0e418 | 986 | if ((ret = manager_get_unit(m, name))) { |
034c6ed7 LP |
987 | *_ret = ret; |
988 | return 0; | |
989 | } | |
60918275 | 990 | |
87f0e418 | 991 | if (!(ret = unit_new(m))) |
60918275 LP |
992 | return -ENOMEM; |
993 | ||
0301abf4 LP |
994 | if (is_path(path)) { |
995 | if (!(ret->meta.load_path = strdup(path))) { | |
996 | unit_free(ret); | |
997 | return -ENOMEM; | |
998 | } | |
999 | } | |
1000 | ||
87f0e418 LP |
1001 | if ((r = unit_add_name(ret, name)) < 0) { |
1002 | unit_free(ret); | |
1ffba6fe | 1003 | return r; |
60918275 LP |
1004 | } |
1005 | ||
87f0e418 | 1006 | unit_add_to_load_queue(ret); |
f50e0a01 | 1007 | manager_dispatch_load_queue(m); |
60918275 | 1008 | |
60918275 LP |
1009 | *_ret = ret; |
1010 | return 0; | |
1011 | } | |
a66d02c3 | 1012 | |
cea8e32e | 1013 | void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) { |
034c6ed7 | 1014 | Iterator i; |
a66d02c3 LP |
1015 | Job *j; |
1016 | ||
1017 | assert(s); | |
1018 | assert(f); | |
1019 | ||
034c6ed7 | 1020 | HASHMAP_FOREACH(j, s->jobs, i) |
cea8e32e | 1021 | job_dump(j, f, prefix); |
a66d02c3 LP |
1022 | } |
1023 | ||
87f0e418 | 1024 | void manager_dump_units(Manager *s, FILE *f, const char *prefix) { |
034c6ed7 | 1025 | Iterator i; |
87f0e418 | 1026 | Unit *u; |
11dd41ce | 1027 | const char *t; |
a66d02c3 LP |
1028 | |
1029 | assert(s); | |
1030 | assert(f); | |
1031 | ||
87f0e418 LP |
1032 | HASHMAP_FOREACH_KEY(u, t, s->units, i) |
1033 | if (unit_id(u) == t) | |
1034 | unit_dump(u, f, prefix); | |
a66d02c3 | 1035 | } |
7fad411c LP |
1036 | |
1037 | void manager_clear_jobs(Manager *m) { | |
1038 | Job *j; | |
1039 | ||
1040 | assert(m); | |
1041 | ||
1042 | transaction_abort(m); | |
1043 | ||
1044 | while ((j = hashmap_first(m->jobs))) | |
1045 | job_free(j); | |
1046 | } | |
83c60c9f | 1047 | |
034c6ed7 | 1048 | void manager_dispatch_run_queue(Manager *m) { |
83c60c9f | 1049 | Job *j; |
83c60c9f | 1050 | |
034c6ed7 LP |
1051 | if (m->dispatching_run_queue) |
1052 | return; | |
1053 | ||
1054 | m->dispatching_run_queue = true; | |
9152c765 | 1055 | |
034c6ed7 | 1056 | while ((j = m->run_queue)) { |
ac1135be | 1057 | assert(j->installed); |
034c6ed7 LP |
1058 | assert(j->in_run_queue); |
1059 | ||
1060 | job_run_and_invalidate(j); | |
9152c765 | 1061 | } |
034c6ed7 LP |
1062 | |
1063 | m->dispatching_run_queue = false; | |
9152c765 LP |
1064 | } |
1065 | ||
034c6ed7 | 1066 | static int manager_dispatch_sigchld(Manager *m) { |
9152c765 LP |
1067 | assert(m); |
1068 | ||
acbb0225 LP |
1069 | log_debug("dispatching SIGCHLD"); |
1070 | ||
9152c765 LP |
1071 | for (;;) { |
1072 | siginfo_t si; | |
87f0e418 | 1073 | Unit *u; |
9152c765 LP |
1074 | |
1075 | zero(si); | |
acbb0225 LP |
1076 | if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG) < 0) { |
1077 | ||
1078 | if (errno == ECHILD) | |
1079 | break; | |
1080 | ||
9152c765 | 1081 | return -errno; |
acbb0225 | 1082 | } |
9152c765 LP |
1083 | |
1084 | if (si.si_pid == 0) | |
1085 | break; | |
1086 | ||
034c6ed7 LP |
1087 | if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED) |
1088 | continue; | |
1089 | ||
94f04347 | 1090 | log_debug("child %llu died (code=%s, status=%i)", (long long unsigned) si.si_pid, sigchld_code_to_string(si.si_code), si.si_status); |
acbb0225 | 1091 | |
87f0e418 | 1092 | if (!(u = hashmap_remove(m->watch_pids, UINT32_TO_PTR(si.si_pid)))) |
9152c765 LP |
1093 | continue; |
1094 | ||
87f0e418 | 1095 | UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status); |
9152c765 LP |
1096 | } |
1097 | ||
1098 | return 0; | |
1099 | } | |
1100 | ||
b9cd2ec1 | 1101 | static int manager_process_signal_fd(Manager *m, bool *quit) { |
9152c765 LP |
1102 | ssize_t n; |
1103 | struct signalfd_siginfo sfsi; | |
1104 | bool sigchld = false; | |
1105 | ||
1106 | assert(m); | |
1107 | ||
1108 | for (;;) { | |
acbb0225 | 1109 | if ((n = read(m->signal_watch.fd, &sfsi, sizeof(sfsi))) != sizeof(sfsi)) { |
9152c765 LP |
1110 | |
1111 | if (n >= 0) | |
1112 | return -EIO; | |
1113 | ||
1114 | if (errno == EAGAIN) | |
acbb0225 | 1115 | break; |
9152c765 LP |
1116 | |
1117 | return -errno; | |
1118 | } | |
1119 | ||
b9cd2ec1 LP |
1120 | switch (sfsi.ssi_signo) { |
1121 | ||
1122 | case SIGCHLD: | |
9152c765 | 1123 | sigchld = true; |
b9cd2ec1 LP |
1124 | break; |
1125 | ||
1126 | case SIGINT: | |
6632c602 | 1127 | case SIGTERM: |
b9cd2ec1 LP |
1128 | *quit = true; |
1129 | return 0; | |
6632c602 LP |
1130 | |
1131 | default: | |
1132 | log_info("Got unhandled signal <%s>.", strsignal(sfsi.ssi_signo)); | |
b9cd2ec1 | 1133 | } |
9152c765 LP |
1134 | } |
1135 | ||
1136 | if (sigchld) | |
034c6ed7 LP |
1137 | return manager_dispatch_sigchld(m); |
1138 | ||
1139 | return 0; | |
1140 | } | |
1141 | ||
b9cd2ec1 | 1142 | static int process_event(Manager *m, struct epoll_event *ev, bool *quit) { |
034c6ed7 | 1143 | int r; |
acbb0225 | 1144 | Watch *w; |
034c6ed7 LP |
1145 | |
1146 | assert(m); | |
1147 | assert(ev); | |
1148 | ||
acbb0225 | 1149 | assert(w = ev->data.ptr); |
034c6ed7 | 1150 | |
acbb0225 | 1151 | switch (w->type) { |
034c6ed7 | 1152 | |
ef734fd6 | 1153 | case WATCH_SIGNAL: |
034c6ed7 | 1154 | |
acbb0225 | 1155 | /* An incoming signal? */ |
f94ea366 | 1156 | if (ev->events != EPOLLIN) |
acbb0225 | 1157 | return -EINVAL; |
034c6ed7 | 1158 | |
b9cd2ec1 | 1159 | if ((r = manager_process_signal_fd(m, quit)) < 0) |
acbb0225 | 1160 | return r; |
034c6ed7 | 1161 | |
acbb0225 | 1162 | break; |
034c6ed7 | 1163 | |
acbb0225 | 1164 | case WATCH_FD: |
034c6ed7 | 1165 | |
acbb0225 | 1166 | /* Some fd event, to be dispatched to the units */ |
ea430986 | 1167 | UNIT_VTABLE(w->data.unit)->fd_event(w->data.unit, w->fd, ev->events, w); |
acbb0225 | 1168 | break; |
034c6ed7 | 1169 | |
acbb0225 LP |
1170 | case WATCH_TIMER: { |
1171 | uint64_t v; | |
1172 | ssize_t k; | |
034c6ed7 | 1173 | |
acbb0225 LP |
1174 | /* Some timer event, to be dispatched to the units */ |
1175 | if ((k = read(ev->data.fd, &v, sizeof(v))) != sizeof(v)) { | |
034c6ed7 | 1176 | |
acbb0225 LP |
1177 | if (k < 0 && (errno == EINTR || errno == EAGAIN)) |
1178 | break; | |
034c6ed7 | 1179 | |
acbb0225 | 1180 | return k < 0 ? -errno : -EIO; |
034c6ed7 LP |
1181 | } |
1182 | ||
ea430986 | 1183 | UNIT_VTABLE(w->data.unit)->timer_event(w->data.unit, v, w); |
acbb0225 LP |
1184 | break; |
1185 | } | |
1186 | ||
ef734fd6 LP |
1187 | case WATCH_MOUNT: |
1188 | /* Some mount table change, intended for the mount subsystem */ | |
1189 | mount_fd_event(m, ev->events); | |
1190 | break; | |
1191 | ||
f94ea366 LP |
1192 | case WATCH_UDEV: |
1193 | /* Some notification from udev, intended for the device subsystem */ | |
1194 | device_fd_event(m, ev->events); | |
1195 | break; | |
1196 | ||
ea430986 LP |
1197 | case WATCH_DBUS_WATCH: |
1198 | bus_watch_event(m, w, ev->events); | |
1199 | break; | |
1200 | ||
1201 | case WATCH_DBUS_TIMEOUT: | |
1202 | bus_timeout_event(m, w, ev->events); | |
1203 | break; | |
1204 | ||
acbb0225 LP |
1205 | default: |
1206 | assert_not_reached("Unknown epoll event type."); | |
034c6ed7 | 1207 | } |
9152c765 LP |
1208 | |
1209 | return 0; | |
1210 | } | |
1211 | ||
1212 | int manager_loop(Manager *m) { | |
1213 | int r; | |
b9cd2ec1 | 1214 | bool quit = false; |
9152c765 | 1215 | |
ea430986 LP |
1216 | RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 1000); |
1217 | ||
9152c765 LP |
1218 | assert(m); |
1219 | ||
1220 | for (;;) { | |
957ca890 LP |
1221 | struct epoll_event event; |
1222 | int n; | |
9152c765 | 1223 | |
ea430986 LP |
1224 | if (!ratelimit_test(&rl)) { |
1225 | /* Yay, something is going seriously wrong, pause a little */ | |
1226 | log_warning("Looping too fast. Throttling execution a little."); | |
1227 | sleep(1); | |
1228 | } | |
1229 | ||
034c6ed7 LP |
1230 | manager_dispatch_run_queue(m); |
1231 | ||
ea430986 LP |
1232 | if (m->request_bus_dispatch) { |
1233 | bus_dispatch(m); | |
1234 | continue; | |
1235 | } | |
1236 | ||
957ca890 | 1237 | if ((n = epoll_wait(m->epoll_fd, &event, 1, -1)) < 0) { |
9152c765 LP |
1238 | |
1239 | if (errno == -EINTR) | |
1240 | continue; | |
1241 | ||
1242 | return -errno; | |
1243 | } | |
1244 | ||
957ca890 | 1245 | assert(n == 1); |
b9cd2ec1 | 1246 | |
957ca890 LP |
1247 | if ((r = process_event(m, &event, &quit)) < 0) |
1248 | return r; | |
1249 | ||
1250 | if (quit) | |
1251 | return 0; | |
83c60c9f LP |
1252 | } |
1253 | } | |
ea430986 LP |
1254 | |
1255 | int manager_get_unit_from_dbus_path(Manager *m, const char *s, Unit **_u) { | |
1256 | char *n; | |
1257 | Unit *u; | |
1258 | ||
1259 | assert(m); | |
1260 | assert(s); | |
1261 | assert(_u); | |
1262 | ||
1263 | if (!startswith(s, "/org/freedesktop/systemd1/unit/")) | |
1264 | return -EINVAL; | |
1265 | ||
1266 | if (!(n = bus_path_unescape(s+31))) | |
1267 | return -ENOMEM; | |
1268 | ||
1269 | u = manager_get_unit(m, n); | |
1270 | free(n); | |
1271 | ||
1272 | if (!u) | |
1273 | return -ENOENT; | |
1274 | ||
1275 | *_u = u; | |
1276 | ||
1277 | return 0; | |
1278 | } | |
86fbf370 LP |
1279 | |
1280 | int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) { | |
1281 | Job *j; | |
1282 | unsigned id; | |
1283 | int r; | |
1284 | ||
1285 | assert(m); | |
1286 | assert(s); | |
1287 | assert(_j); | |
1288 | ||
1289 | if (!startswith(s, "/org/freedesktop/systemd1/job/")) | |
1290 | return -EINVAL; | |
1291 | ||
1292 | if ((r = safe_atou(s + 30, &id)) < 0) | |
1293 | return r; | |
1294 | ||
1295 | if (!(j = manager_get_job(m, id))) | |
1296 | return -ENOENT; | |
1297 | ||
1298 | *_j = j; | |
1299 | ||
1300 | return 0; | |
1301 | } |