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fd38203a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 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 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/epoll.h> | |
23 | #include <sys/timerfd.h> | |
24 | #include <sys/wait.h> | |
25 | ||
26 | #include "macro.h" | |
fd38203a LP |
27 | #include "prioq.h" |
28 | #include "hashmap.h" | |
29 | #include "util.h" | |
30 | #include "time-util.h" | |
c2ba3ad6 | 31 | #include "sd-id128.h" |
fd38203a LP |
32 | |
33 | #include "sd-event.h" | |
34 | ||
35 | #define EPOLL_QUEUE_MAX 64 | |
c2ba3ad6 | 36 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
37 | |
38 | typedef enum EventSourceType { | |
39 | SOURCE_IO, | |
40 | SOURCE_MONOTONIC, | |
41 | SOURCE_REALTIME, | |
42 | SOURCE_SIGNAL, | |
43 | SOURCE_CHILD, | |
da7e457c LP |
44 | SOURCE_DEFER, |
45 | SOURCE_QUIT | |
fd38203a LP |
46 | } EventSourceType; |
47 | ||
48 | struct sd_event_source { | |
da7e457c | 49 | unsigned n_ref; |
fd38203a LP |
50 | |
51 | sd_event *event; | |
52 | void *userdata; | |
53 | sd_prepare_handler_t prepare; | |
54 | ||
55 | EventSourceType type:4; | |
baf76283 | 56 | int enabled:3; |
fd38203a LP |
57 | bool pending:1; |
58 | ||
59 | int priority; | |
60 | unsigned pending_index; | |
61 | unsigned prepare_index; | |
62 | unsigned pending_iteration; | |
63 | unsigned prepare_iteration; | |
64 | ||
65 | union { | |
66 | struct { | |
67 | sd_io_handler_t callback; | |
68 | int fd; | |
69 | uint32_t events; | |
70 | uint32_t revents; | |
71 | bool registered:1; | |
72 | } io; | |
73 | struct { | |
74 | sd_time_handler_t callback; | |
c2ba3ad6 LP |
75 | usec_t next, accuracy; |
76 | unsigned earliest_index; | |
77 | unsigned latest_index; | |
fd38203a LP |
78 | } time; |
79 | struct { | |
80 | sd_signal_handler_t callback; | |
81 | struct signalfd_siginfo siginfo; | |
82 | int sig; | |
83 | } signal; | |
84 | struct { | |
85 | sd_child_handler_t callback; | |
86 | siginfo_t siginfo; | |
87 | pid_t pid; | |
88 | int options; | |
89 | } child; | |
90 | struct { | |
91 | sd_defer_handler_t callback; | |
92 | } defer; | |
da7e457c LP |
93 | struct { |
94 | sd_quit_handler_t callback; | |
95 | unsigned prioq_index; | |
96 | } quit; | |
fd38203a LP |
97 | }; |
98 | }; | |
99 | ||
100 | struct sd_event { | |
da7e457c | 101 | unsigned n_ref; |
fd38203a LP |
102 | |
103 | int epoll_fd; | |
104 | int signal_fd; | |
105 | int realtime_fd; | |
106 | int monotonic_fd; | |
107 | ||
108 | Prioq *pending; | |
109 | Prioq *prepare; | |
c2ba3ad6 LP |
110 | |
111 | /* For both clocks we maintain two priority queues each, one | |
112 | * ordered for the earliest times the events may be | |
113 | * dispatched, and one ordered by the latest times they must | |
114 | * have been dispatched. The range between the top entries in | |
115 | * the two prioqs is the time window we can freely schedule | |
116 | * wakeups in */ | |
117 | Prioq *monotonic_earliest; | |
118 | Prioq *monotonic_latest; | |
119 | Prioq *realtime_earliest; | |
120 | Prioq *realtime_latest; | |
fd38203a | 121 | |
da7e457c LP |
122 | usec_t realtime_next, monotonic_next; |
123 | usec_t perturb; | |
124 | ||
fd38203a LP |
125 | sigset_t sigset; |
126 | sd_event_source **signal_sources; | |
127 | ||
128 | Hashmap *child_sources; | |
baf76283 | 129 | unsigned n_enabled_child_sources; |
fd38203a | 130 | |
da7e457c | 131 | Prioq *quit; |
fd38203a | 132 | |
da7e457c | 133 | pid_t original_pid; |
c2ba3ad6 | 134 | |
da7e457c LP |
135 | unsigned iteration; |
136 | int state; | |
eaa3cbef | 137 | |
da7e457c LP |
138 | bool quit_requested:1; |
139 | bool need_process_child:1; | |
fd38203a LP |
140 | }; |
141 | ||
142 | static int pending_prioq_compare(const void *a, const void *b) { | |
143 | const sd_event_source *x = a, *y = b; | |
144 | ||
145 | assert(x->pending); | |
146 | assert(y->pending); | |
147 | ||
baf76283 LP |
148 | /* Enabled ones first */ |
149 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 150 | return -1; |
baf76283 | 151 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
152 | return 1; |
153 | ||
154 | /* Lower priority values first */ | |
155 | if (x->priority < y->priority) | |
156 | return -1; | |
157 | if (x->priority > y->priority) | |
158 | return 1; | |
159 | ||
160 | /* Older entries first */ | |
161 | if (x->pending_iteration < y->pending_iteration) | |
162 | return -1; | |
163 | if (x->pending_iteration > y->pending_iteration) | |
164 | return 1; | |
165 | ||
166 | /* Stability for the rest */ | |
167 | if (x < y) | |
168 | return -1; | |
dfcd88f6 | 169 | if (x > y) |
fd38203a LP |
170 | return 1; |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static int prepare_prioq_compare(const void *a, const void *b) { | |
176 | const sd_event_source *x = a, *y = b; | |
177 | ||
178 | assert(x->prepare); | |
179 | assert(y->prepare); | |
180 | ||
181 | /* Move most recently prepared ones last, so that we can stop | |
182 | * preparing as soon as we hit one that has already been | |
183 | * prepared in the current iteration */ | |
184 | if (x->prepare_iteration < y->prepare_iteration) | |
185 | return -1; | |
186 | if (x->prepare_iteration > y->prepare_iteration) | |
187 | return 1; | |
188 | ||
baf76283 LP |
189 | /* Enabled ones first */ |
190 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 191 | return -1; |
baf76283 | 192 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
193 | return 1; |
194 | ||
195 | /* Lower priority values first */ | |
196 | if (x->priority < y->priority) | |
197 | return -1; | |
198 | if (x->priority > y->priority) | |
199 | return 1; | |
200 | ||
201 | /* Stability for the rest */ | |
202 | if (x < y) | |
203 | return -1; | |
dfcd88f6 | 204 | if (x > y) |
fd38203a LP |
205 | return 1; |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
c2ba3ad6 | 210 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
211 | const sd_event_source *x = a, *y = b; |
212 | ||
213 | assert(x->type == SOURCE_MONOTONIC || x->type == SOURCE_REALTIME); | |
214 | assert(y->type == SOURCE_MONOTONIC || y->type == SOURCE_REALTIME); | |
215 | ||
baf76283 LP |
216 | /* Enabled ones first */ |
217 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 218 | return -1; |
baf76283 | 219 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
220 | return 1; |
221 | ||
222 | /* Move the pending ones to the end */ | |
223 | if (!x->pending && y->pending) | |
224 | return -1; | |
225 | if (x->pending && !y->pending) | |
226 | return 1; | |
227 | ||
228 | /* Order by time */ | |
229 | if (x->time.next < y->time.next) | |
230 | return -1; | |
231 | if (x->time.next > y->time.next) | |
232 | return -1; | |
233 | ||
234 | /* Stability for the rest */ | |
235 | if (x < y) | |
236 | return -1; | |
dfcd88f6 | 237 | if (x > y) |
fd38203a LP |
238 | return 1; |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
c2ba3ad6 LP |
243 | static int latest_time_prioq_compare(const void *a, const void *b) { |
244 | const sd_event_source *x = a, *y = b; | |
245 | ||
da7e457c LP |
246 | assert((x->type == SOURCE_MONOTONIC && y->type == SOURCE_MONOTONIC) || |
247 | (x->type == SOURCE_REALTIME && y->type == SOURCE_REALTIME)); | |
c2ba3ad6 | 248 | |
baf76283 LP |
249 | /* Enabled ones first */ |
250 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 251 | return -1; |
baf76283 | 252 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
253 | return 1; |
254 | ||
255 | /* Move the pending ones to the end */ | |
256 | if (!x->pending && y->pending) | |
257 | return -1; | |
258 | if (x->pending && !y->pending) | |
259 | return 1; | |
260 | ||
261 | /* Order by time */ | |
262 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
263 | return -1; | |
264 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
265 | return -1; | |
266 | ||
267 | /* Stability for the rest */ | |
268 | if (x < y) | |
269 | return -1; | |
270 | if (x > y) | |
271 | return 1; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
da7e457c LP |
276 | static int quit_prioq_compare(const void *a, const void *b) { |
277 | const sd_event_source *x = a, *y = b; | |
278 | ||
279 | assert(x->type == SOURCE_QUIT); | |
280 | assert(y->type == SOURCE_QUIT); | |
281 | ||
baf76283 LP |
282 | /* Enabled ones first */ |
283 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 284 | return -1; |
baf76283 | 285 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
286 | return 1; |
287 | ||
288 | /* Lower priority values first */ | |
289 | if (x->priority < y->priority) | |
290 | return -1; | |
291 | if (x->priority > y->priority) | |
292 | return 1; | |
293 | ||
294 | /* Stability for the rest */ | |
295 | if (x < y) | |
296 | return -1; | |
297 | if (x > y) | |
298 | return 1; | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
fd38203a LP |
303 | static void event_free(sd_event *e) { |
304 | assert(e); | |
305 | ||
306 | if (e->epoll_fd >= 0) | |
307 | close_nointr_nofail(e->epoll_fd); | |
308 | ||
309 | if (e->signal_fd >= 0) | |
310 | close_nointr_nofail(e->signal_fd); | |
311 | ||
312 | if (e->realtime_fd >= 0) | |
313 | close_nointr_nofail(e->realtime_fd); | |
314 | ||
315 | if (e->monotonic_fd >= 0) | |
316 | close_nointr_nofail(e->monotonic_fd); | |
317 | ||
318 | prioq_free(e->pending); | |
319 | prioq_free(e->prepare); | |
c2ba3ad6 LP |
320 | prioq_free(e->monotonic_earliest); |
321 | prioq_free(e->monotonic_latest); | |
322 | prioq_free(e->realtime_earliest); | |
323 | prioq_free(e->realtime_latest); | |
da7e457c | 324 | prioq_free(e->quit); |
fd38203a LP |
325 | |
326 | free(e->signal_sources); | |
327 | ||
328 | hashmap_free(e->child_sources); | |
329 | free(e); | |
330 | } | |
331 | ||
332 | int sd_event_new(sd_event** ret) { | |
333 | sd_event *e; | |
334 | int r; | |
335 | ||
305f78bf | 336 | assert_return(ret, -EINVAL); |
fd38203a LP |
337 | |
338 | e = new0(sd_event, 1); | |
339 | if (!e) | |
340 | return -ENOMEM; | |
341 | ||
da7e457c | 342 | e->n_ref = 1; |
fd38203a LP |
343 | e->signal_fd = e->realtime_fd = e->monotonic_fd = e->epoll_fd = -1; |
344 | e->realtime_next = e->monotonic_next = (usec_t) -1; | |
eaa3cbef | 345 | e->original_pid = getpid(); |
fd38203a LP |
346 | |
347 | assert_se(sigemptyset(&e->sigset) == 0); | |
348 | ||
349 | e->pending = prioq_new(pending_prioq_compare); | |
350 | if (!e->pending) { | |
351 | r = -ENOMEM; | |
352 | goto fail; | |
353 | } | |
354 | ||
355 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
356 | if (e->epoll_fd < 0) { | |
357 | r = -errno; | |
358 | goto fail; | |
359 | } | |
360 | ||
361 | *ret = e; | |
362 | return 0; | |
363 | ||
364 | fail: | |
365 | event_free(e); | |
366 | return r; | |
367 | } | |
368 | ||
369 | sd_event* sd_event_ref(sd_event *e) { | |
305f78bf | 370 | assert_return(e, NULL); |
fd38203a | 371 | |
da7e457c LP |
372 | assert(e->n_ref >= 1); |
373 | e->n_ref++; | |
fd38203a LP |
374 | |
375 | return e; | |
376 | } | |
377 | ||
378 | sd_event* sd_event_unref(sd_event *e) { | |
305f78bf | 379 | assert_return(e, NULL); |
fd38203a | 380 | |
da7e457c LP |
381 | assert(e->n_ref >= 1); |
382 | e->n_ref--; | |
383 | ||
384 | if (e->n_ref <= 0) | |
fd38203a LP |
385 | event_free(e); |
386 | ||
387 | return NULL; | |
388 | } | |
389 | ||
eaa3cbef LP |
390 | static bool event_pid_changed(sd_event *e) { |
391 | assert(e); | |
392 | ||
393 | /* We don't support people creating am event loop and keeping | |
394 | * it around over a fork(). Let's complain. */ | |
395 | ||
396 | return e->original_pid != getpid(); | |
397 | } | |
398 | ||
fd38203a LP |
399 | static int source_io_unregister(sd_event_source *s) { |
400 | int r; | |
401 | ||
402 | assert(s); | |
403 | assert(s->type == SOURCE_IO); | |
404 | ||
405 | if (!s->io.registered) | |
406 | return 0; | |
407 | ||
408 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
409 | if (r < 0) | |
410 | return -errno; | |
411 | ||
412 | s->io.registered = false; | |
413 | return 0; | |
414 | } | |
415 | ||
305f78bf LP |
416 | static int source_io_register( |
417 | sd_event_source *s, | |
418 | int enabled, | |
419 | uint32_t events) { | |
420 | ||
fd38203a LP |
421 | struct epoll_event ev = {}; |
422 | int r; | |
423 | ||
424 | assert(s); | |
425 | assert(s->type == SOURCE_IO); | |
baf76283 | 426 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
427 | |
428 | ev.events = events; | |
429 | ev.data.ptr = s; | |
430 | ||
baf76283 | 431 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
432 | ev.events |= EPOLLONESHOT; |
433 | ||
434 | if (s->io.registered) | |
435 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
436 | else | |
437 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
438 | ||
439 | if (r < 0) | |
440 | return -errno; | |
441 | ||
442 | s->io.registered = true; | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | static void source_free(sd_event_source *s) { | |
448 | assert(s); | |
449 | ||
450 | if (s->event) { | |
451 | switch (s->type) { | |
452 | ||
453 | case SOURCE_IO: | |
454 | if (s->io.fd >= 0) | |
455 | source_io_unregister(s); | |
456 | ||
457 | break; | |
458 | ||
459 | case SOURCE_MONOTONIC: | |
c2ba3ad6 LP |
460 | prioq_remove(s->event->monotonic_earliest, s, &s->time.earliest_index); |
461 | prioq_remove(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
462 | break; |
463 | ||
464 | case SOURCE_REALTIME: | |
c2ba3ad6 LP |
465 | prioq_remove(s->event->realtime_earliest, s, &s->time.earliest_index); |
466 | prioq_remove(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
467 | break; |
468 | ||
469 | case SOURCE_SIGNAL: | |
470 | if (s->signal.sig > 0) { | |
baf76283 | 471 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) |
fd38203a LP |
472 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
473 | ||
474 | if (s->event->signal_sources) | |
475 | s->event->signal_sources[s->signal.sig] = NULL; | |
476 | } | |
477 | ||
478 | break; | |
479 | ||
480 | case SOURCE_CHILD: | |
481 | if (s->child.pid > 0) { | |
baf76283 LP |
482 | if (s->enabled != SD_EVENT_OFF) { |
483 | assert(s->event->n_enabled_child_sources > 0); | |
484 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
485 | } |
486 | ||
487 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) | |
488 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
489 | ||
490 | hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid)); | |
491 | } | |
492 | ||
493 | break; | |
da7e457c LP |
494 | |
495 | case SOURCE_QUIT: | |
496 | prioq_remove(s->event->quit, s, &s->quit.prioq_index); | |
497 | break; | |
fd38203a LP |
498 | } |
499 | ||
500 | if (s->pending) | |
501 | prioq_remove(s->event->pending, s, &s->pending_index); | |
502 | ||
503 | if (s->prepare) | |
504 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
505 | ||
506 | sd_event_unref(s->event); | |
507 | } | |
508 | ||
509 | free(s); | |
510 | } | |
511 | ||
512 | static int source_set_pending(sd_event_source *s, bool b) { | |
513 | int r; | |
514 | ||
515 | assert(s); | |
da7e457c | 516 | assert(s->type != SOURCE_QUIT); |
fd38203a LP |
517 | |
518 | if (s->pending == b) | |
519 | return 0; | |
520 | ||
521 | s->pending = b; | |
522 | ||
523 | if (b) { | |
524 | s->pending_iteration = s->event->iteration; | |
525 | ||
526 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
527 | if (r < 0) { | |
528 | s->pending = false; | |
529 | return r; | |
530 | } | |
531 | } else | |
532 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
537 | static sd_event_source *source_new(sd_event *e, EventSourceType type) { | |
538 | sd_event_source *s; | |
539 | ||
540 | assert(e); | |
541 | ||
542 | s = new0(sd_event_source, 1); | |
543 | if (!s) | |
544 | return NULL; | |
545 | ||
da7e457c | 546 | s->n_ref = 1; |
fd38203a LP |
547 | s->event = sd_event_ref(e); |
548 | s->type = type; | |
fd38203a LP |
549 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
550 | ||
551 | return s; | |
552 | } | |
553 | ||
554 | int sd_event_add_io( | |
555 | sd_event *e, | |
556 | int fd, | |
557 | uint32_t events, | |
558 | sd_io_handler_t callback, | |
559 | void *userdata, | |
560 | sd_event_source **ret) { | |
561 | ||
562 | sd_event_source *s; | |
563 | int r; | |
564 | ||
305f78bf LP |
565 | assert_return(e, -EINVAL); |
566 | assert_return(fd >= 0, -EINVAL); | |
567 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP)), -EINVAL); | |
568 | assert_return(callback, -EINVAL); | |
569 | assert_return(ret, -EINVAL); | |
da7e457c | 570 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 571 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
572 | |
573 | s = source_new(e, SOURCE_IO); | |
574 | if (!s) | |
575 | return -ENOMEM; | |
576 | ||
577 | s->io.fd = fd; | |
578 | s->io.events = events; | |
579 | s->io.callback = callback; | |
580 | s->userdata = userdata; | |
baf76283 | 581 | s->enabled = SD_EVENT_ON; |
fd38203a | 582 | |
baf76283 | 583 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
584 | if (r < 0) { |
585 | source_free(s); | |
586 | return -errno; | |
587 | } | |
588 | ||
589 | *ret = s; | |
590 | return 0; | |
591 | } | |
592 | ||
593 | static int event_setup_timer_fd( | |
594 | sd_event *e, | |
595 | EventSourceType type, | |
596 | int *timer_fd, | |
597 | clockid_t id) { | |
598 | ||
599 | struct epoll_event ev = {}; | |
600 | int r, fd; | |
c2ba3ad6 | 601 | sd_id128_t bootid; |
fd38203a LP |
602 | |
603 | assert(e); | |
604 | assert(timer_fd); | |
605 | ||
606 | if (_likely_(*timer_fd >= 0)) | |
607 | return 0; | |
608 | ||
609 | fd = timerfd_create(id, TFD_NONBLOCK|TFD_CLOEXEC); | |
610 | if (fd < 0) | |
611 | return -errno; | |
612 | ||
613 | ev.events = EPOLLIN; | |
614 | ev.data.ptr = INT_TO_PTR(type); | |
615 | ||
616 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
617 | if (r < 0) { | |
618 | close_nointr_nofail(fd); | |
619 | return -errno; | |
620 | } | |
621 | ||
c2ba3ad6 LP |
622 | /* When we sleep for longer, we try to realign the wakeup to |
623 | the same time wihtin each second, so that events all across | |
624 | the system can be coalesced into a single CPU | |
625 | wakeup. However, let's take some system-specific randomness | |
626 | for this value, so that in a network of systems with synced | |
627 | clocks timer events are distributed a bit. Here, we | |
628 | calculate a perturbation usec offset from the boot ID. */ | |
629 | ||
630 | if (sd_id128_get_boot(&bootid) >= 0) | |
631 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_SEC; | |
632 | ||
fd38203a LP |
633 | *timer_fd = fd; |
634 | return 0; | |
635 | } | |
636 | ||
637 | static int event_add_time_internal( | |
638 | sd_event *e, | |
639 | EventSourceType type, | |
640 | int *timer_fd, | |
641 | clockid_t id, | |
c2ba3ad6 LP |
642 | Prioq **earliest, |
643 | Prioq **latest, | |
fd38203a | 644 | uint64_t usec, |
c2ba3ad6 | 645 | uint64_t accuracy, |
fd38203a LP |
646 | sd_time_handler_t callback, |
647 | void *userdata, | |
648 | sd_event_source **ret) { | |
649 | ||
650 | sd_event_source *s; | |
651 | int r; | |
652 | ||
305f78bf LP |
653 | assert_return(e, -EINVAL); |
654 | assert_return(callback, -EINVAL); | |
655 | assert_return(ret, -EINVAL); | |
656 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
657 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
da7e457c | 658 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 659 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
660 | |
661 | assert(timer_fd); | |
c2ba3ad6 LP |
662 | assert(earliest); |
663 | assert(latest); | |
664 | ||
665 | if (!*earliest) { | |
666 | *earliest = prioq_new(earliest_time_prioq_compare); | |
667 | if (!*earliest) | |
668 | return -ENOMEM; | |
669 | } | |
fd38203a | 670 | |
c2ba3ad6 LP |
671 | if (!*latest) { |
672 | *latest = prioq_new(latest_time_prioq_compare); | |
673 | if (!*latest) | |
fd38203a LP |
674 | return -ENOMEM; |
675 | } | |
676 | ||
677 | if (*timer_fd < 0) { | |
678 | r = event_setup_timer_fd(e, type, timer_fd, id); | |
679 | if (r < 0) | |
680 | return r; | |
681 | } | |
682 | ||
683 | s = source_new(e, type); | |
684 | if (!s) | |
685 | return -ENOMEM; | |
686 | ||
687 | s->time.next = usec; | |
c2ba3ad6 | 688 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 689 | s->time.callback = callback; |
da7e457c | 690 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 691 | s->userdata = userdata; |
baf76283 | 692 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 693 | |
c2ba3ad6 LP |
694 | r = prioq_put(*earliest, s, &s->time.earliest_index); |
695 | if (r < 0) | |
696 | goto fail; | |
697 | ||
698 | r = prioq_put(*latest, s, &s->time.latest_index); | |
699 | if (r < 0) | |
700 | goto fail; | |
fd38203a LP |
701 | |
702 | *ret = s; | |
703 | return 0; | |
c2ba3ad6 LP |
704 | |
705 | fail: | |
706 | source_free(s); | |
707 | return r; | |
fd38203a LP |
708 | } |
709 | ||
c2ba3ad6 LP |
710 | int sd_event_add_monotonic(sd_event *e, uint64_t usec, uint64_t accuracy, sd_time_handler_t callback, void *userdata, sd_event_source **ret) { |
711 | return event_add_time_internal(e, SOURCE_MONOTONIC, &e->monotonic_fd, CLOCK_MONOTONIC, &e->monotonic_earliest, &e->monotonic_latest, usec, accuracy, callback, userdata, ret); | |
fd38203a LP |
712 | } |
713 | ||
c2ba3ad6 LP |
714 | int sd_event_add_realtime(sd_event *e, uint64_t usec, uint64_t accuracy, sd_time_handler_t callback, void *userdata, sd_event_source **ret) { |
715 | return event_add_time_internal(e, SOURCE_REALTIME, &e->realtime_fd, CLOCK_REALTIME, &e->realtime_earliest, &e->monotonic_latest, usec, accuracy, callback, userdata, ret); | |
fd38203a LP |
716 | } |
717 | ||
718 | static int event_update_signal_fd(sd_event *e) { | |
719 | struct epoll_event ev = {}; | |
720 | bool add_to_epoll; | |
721 | int r; | |
722 | ||
723 | assert(e); | |
724 | ||
725 | add_to_epoll = e->signal_fd < 0; | |
726 | ||
727 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
728 | if (r < 0) | |
729 | return -errno; | |
730 | ||
731 | e->signal_fd = r; | |
732 | ||
733 | if (!add_to_epoll) | |
734 | return 0; | |
735 | ||
736 | ev.events = EPOLLIN; | |
737 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
738 | ||
739 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
740 | if (r < 0) { | |
741 | close_nointr_nofail(e->signal_fd); | |
742 | e->signal_fd = -1; | |
743 | ||
744 | return -errno; | |
745 | } | |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
305f78bf LP |
750 | int sd_event_add_signal( |
751 | sd_event *e, | |
752 | int sig, | |
753 | sd_signal_handler_t callback, | |
754 | void *userdata, | |
755 | sd_event_source **ret) { | |
756 | ||
fd38203a LP |
757 | sd_event_source *s; |
758 | int r; | |
759 | ||
305f78bf LP |
760 | assert_return(e, -EINVAL); |
761 | assert_return(sig > 0, -EINVAL); | |
762 | assert_return(sig < _NSIG, -EINVAL); | |
763 | assert_return(callback, -EINVAL); | |
764 | assert_return(ret, -EINVAL); | |
da7e457c | 765 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 766 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
767 | |
768 | if (!e->signal_sources) { | |
769 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
770 | if (!e->signal_sources) | |
771 | return -ENOMEM; | |
772 | } else if (e->signal_sources[sig]) | |
773 | return -EBUSY; | |
774 | ||
775 | s = source_new(e, SOURCE_SIGNAL); | |
776 | if (!s) | |
777 | return -ENOMEM; | |
778 | ||
779 | s->signal.sig = sig; | |
780 | s->signal.callback = callback; | |
781 | s->userdata = userdata; | |
baf76283 | 782 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
783 | |
784 | e->signal_sources[sig] = s; | |
785 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
786 | ||
baf76283 | 787 | if (sig != SIGCHLD || e->n_enabled_child_sources == 0) { |
fd38203a LP |
788 | r = event_update_signal_fd(e); |
789 | if (r < 0) { | |
790 | source_free(s); | |
791 | return r; | |
792 | } | |
793 | } | |
794 | ||
795 | *ret = s; | |
796 | return 0; | |
797 | } | |
798 | ||
305f78bf LP |
799 | int sd_event_add_child( |
800 | sd_event *e, | |
801 | pid_t pid, | |
802 | int options, | |
803 | sd_child_handler_t callback, | |
804 | void *userdata, | |
805 | sd_event_source **ret) { | |
806 | ||
fd38203a LP |
807 | sd_event_source *s; |
808 | int r; | |
809 | ||
305f78bf LP |
810 | assert_return(e, -EINVAL); |
811 | assert_return(pid > 1, -EINVAL); | |
812 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
813 | assert_return(options != 0, -EINVAL); | |
814 | assert_return(callback, -EINVAL); | |
815 | assert_return(ret, -EINVAL); | |
da7e457c | 816 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 817 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
818 | |
819 | r = hashmap_ensure_allocated(&e->child_sources, trivial_hash_func, trivial_compare_func); | |
820 | if (r < 0) | |
821 | return r; | |
822 | ||
823 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
824 | return -EBUSY; | |
825 | ||
826 | s = source_new(e, SOURCE_CHILD); | |
827 | if (!s) | |
828 | return -ENOMEM; | |
829 | ||
830 | s->child.pid = pid; | |
831 | s->child.options = options; | |
832 | s->child.callback = callback; | |
833 | s->userdata = userdata; | |
baf76283 | 834 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
835 | |
836 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
837 | if (r < 0) { | |
838 | source_free(s); | |
839 | return r; | |
840 | } | |
841 | ||
baf76283 | 842 | e->n_enabled_child_sources ++; |
fd38203a LP |
843 | |
844 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
845 | ||
846 | if (!e->signal_sources || !e->signal_sources[SIGCHLD]) { | |
847 | r = event_update_signal_fd(e); | |
848 | if (r < 0) { | |
849 | source_free(s); | |
850 | return -errno; | |
851 | } | |
852 | } | |
853 | ||
c2ba3ad6 LP |
854 | e->need_process_child = true; |
855 | ||
fd38203a LP |
856 | *ret = s; |
857 | return 0; | |
858 | } | |
859 | ||
305f78bf LP |
860 | int sd_event_add_defer( |
861 | sd_event *e, | |
862 | sd_defer_handler_t callback, | |
863 | void *userdata, | |
864 | sd_event_source **ret) { | |
865 | ||
fd38203a LP |
866 | sd_event_source *s; |
867 | int r; | |
868 | ||
305f78bf LP |
869 | assert_return(e, -EINVAL); |
870 | assert_return(callback, -EINVAL); | |
871 | assert_return(ret, -EINVAL); | |
da7e457c | 872 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 873 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
874 | |
875 | s = source_new(e, SOURCE_DEFER); | |
876 | if (!s) | |
877 | return -ENOMEM; | |
878 | ||
879 | s->defer.callback = callback; | |
880 | s->userdata = userdata; | |
baf76283 | 881 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
882 | |
883 | r = source_set_pending(s, true); | |
884 | if (r < 0) { | |
885 | source_free(s); | |
886 | return r; | |
887 | } | |
888 | ||
889 | *ret = s; | |
890 | return 0; | |
891 | } | |
892 | ||
305f78bf LP |
893 | int sd_event_add_quit( |
894 | sd_event *e, | |
895 | sd_quit_handler_t callback, | |
896 | void *userdata, | |
897 | sd_event_source **ret) { | |
898 | ||
da7e457c LP |
899 | sd_event_source *s; |
900 | int r; | |
901 | ||
902 | assert_return(e, -EINVAL); | |
903 | assert_return(callback, -EINVAL); | |
305f78bf | 904 | assert_return(ret, -EINVAL); |
da7e457c LP |
905 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
906 | assert_return(!event_pid_changed(e), -ECHILD); | |
907 | ||
908 | if (!e->quit) { | |
909 | e->quit = prioq_new(quit_prioq_compare); | |
910 | if (!e->quit) | |
911 | return -ENOMEM; | |
912 | } | |
913 | ||
914 | s = source_new(e, SOURCE_QUIT); | |
fd38203a | 915 | if (!s) |
da7e457c | 916 | return -ENOMEM; |
fd38203a | 917 | |
da7e457c LP |
918 | s->quit.callback = callback; |
919 | s->userdata = userdata; | |
920 | s->quit.prioq_index = PRIOQ_IDX_NULL; | |
baf76283 | 921 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c LP |
922 | |
923 | r = prioq_put(s->event->quit, s, &s->quit.prioq_index); | |
924 | if (r < 0) { | |
925 | source_free(s); | |
926 | return r; | |
927 | } | |
928 | ||
929 | *ret = s; | |
930 | return 0; | |
931 | } | |
932 | ||
933 | sd_event_source* sd_event_source_ref(sd_event_source *s) { | |
934 | assert_return(s, NULL); | |
935 | ||
936 | assert(s->n_ref >= 1); | |
937 | s->n_ref++; | |
fd38203a LP |
938 | |
939 | return s; | |
940 | } | |
941 | ||
942 | sd_event_source* sd_event_source_unref(sd_event_source *s) { | |
da7e457c | 943 | assert_return(s, NULL); |
fd38203a | 944 | |
da7e457c LP |
945 | assert(s->n_ref >= 1); |
946 | s->n_ref--; | |
947 | ||
948 | if (s->n_ref <= 0) | |
fd38203a LP |
949 | source_free(s); |
950 | ||
951 | return NULL; | |
952 | } | |
953 | ||
eaa3cbef | 954 | sd_event *sd_event_get(sd_event_source *s) { |
305f78bf | 955 | assert_return(s, NULL); |
eaa3cbef LP |
956 | |
957 | return s->event; | |
958 | } | |
959 | ||
fd38203a | 960 | int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf LP |
961 | assert_return(s, -EINVAL); |
962 | assert_return(s->type != SOURCE_QUIT, -EDOM); | |
da7e457c | 963 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 964 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
965 | |
966 | return s->pending; | |
967 | } | |
968 | ||
969 | int sd_event_source_get_io_fd(sd_event_source *s) { | |
305f78bf LP |
970 | assert_return(s, -EINVAL); |
971 | assert_return(s->type == SOURCE_IO, -EDOM); | |
972 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
973 | |
974 | return s->io.fd; | |
975 | } | |
976 | ||
977 | int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { | |
305f78bf LP |
978 | assert_return(s, -EINVAL); |
979 | assert_return(events, -EINVAL); | |
980 | assert_return(s->type == SOURCE_IO, -EDOM); | |
981 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
982 | |
983 | *events = s->io.events; | |
984 | return 0; | |
985 | } | |
986 | ||
987 | int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { | |
988 | int r; | |
989 | ||
305f78bf LP |
990 | assert_return(s, -EINVAL); |
991 | assert_return(s->type == SOURCE_IO, -EDOM); | |
992 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP)), -EINVAL); | |
da7e457c | 993 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 994 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
995 | |
996 | if (s->io.events == events) | |
997 | return 0; | |
998 | ||
baf76283 | 999 | if (s->enabled != SD_EVENT_OFF) { |
fd38203a LP |
1000 | r = source_io_register(s, s->io.events, events); |
1001 | if (r < 0) | |
1002 | return r; | |
1003 | } | |
1004 | ||
1005 | s->io.events = events; | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { | |
305f78bf LP |
1011 | assert_return(s, -EINVAL); |
1012 | assert_return(revents, -EINVAL); | |
1013 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1014 | assert_return(s->pending, -ENODATA); | |
1015 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1016 | |
1017 | *revents = s->io.revents; | |
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | int sd_event_source_get_signal(sd_event_source *s) { | |
305f78bf LP |
1022 | assert_return(s, -EINVAL); |
1023 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1024 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1025 | |
1026 | return s->signal.sig; | |
1027 | } | |
1028 | ||
1029 | int sd_event_source_get_priority(sd_event_source *s, int *priority) { | |
305f78bf LP |
1030 | assert_return(s, -EINVAL); |
1031 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1032 | |
1033 | return s->priority; | |
1034 | } | |
1035 | ||
1036 | int sd_event_source_set_priority(sd_event_source *s, int priority) { | |
305f78bf | 1037 | assert_return(s, -EINVAL); |
da7e457c | 1038 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1039 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1040 | |
1041 | if (s->priority == priority) | |
1042 | return 0; | |
1043 | ||
1044 | s->priority = priority; | |
1045 | ||
1046 | if (s->pending) | |
c2ba3ad6 | 1047 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1048 | |
1049 | if (s->prepare) | |
c2ba3ad6 | 1050 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1051 | |
305f78bf LP |
1052 | if (s->type == SOURCE_QUIT) |
1053 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1054 | ||
fd38203a LP |
1055 | return 0; |
1056 | } | |
1057 | ||
baf76283 | 1058 | int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1059 | assert_return(s, -EINVAL); |
1060 | assert_return(m, -EINVAL); | |
1061 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1062 | |
baf76283 | 1063 | *m = s->enabled; |
fd38203a LP |
1064 | return 0; |
1065 | } | |
1066 | ||
baf76283 | 1067 | int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1068 | int r; |
1069 | ||
305f78bf LP |
1070 | assert_return(s, -EINVAL); |
1071 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
da7e457c | 1072 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1073 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1074 | |
baf76283 | 1075 | if (s->enabled == m) |
fd38203a LP |
1076 | return 0; |
1077 | ||
baf76283 | 1078 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1079 | |
1080 | switch (s->type) { | |
1081 | ||
1082 | case SOURCE_IO: | |
1083 | r = source_io_unregister(s); | |
1084 | if (r < 0) | |
1085 | return r; | |
1086 | ||
baf76283 | 1087 | s->enabled = m; |
fd38203a LP |
1088 | break; |
1089 | ||
1090 | case SOURCE_MONOTONIC: | |
baf76283 | 1091 | s->enabled = m; |
c2ba3ad6 LP |
1092 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); |
1093 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
1094 | break; |
1095 | ||
1096 | case SOURCE_REALTIME: | |
baf76283 | 1097 | s->enabled = m; |
c2ba3ad6 LP |
1098 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); |
1099 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
1100 | break; |
1101 | ||
1102 | case SOURCE_SIGNAL: | |
baf76283 LP |
1103 | s->enabled = m; |
1104 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { | |
fd38203a LP |
1105 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
1106 | event_update_signal_fd(s->event); | |
1107 | } | |
1108 | ||
1109 | break; | |
1110 | ||
1111 | case SOURCE_CHILD: | |
baf76283 | 1112 | s->enabled = m; |
fd38203a | 1113 | |
baf76283 LP |
1114 | assert(s->event->n_enabled_child_sources > 0); |
1115 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
1116 | |
1117 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1118 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
1119 | event_update_signal_fd(s->event); | |
1120 | } | |
1121 | ||
1122 | break; | |
1123 | ||
da7e457c | 1124 | case SOURCE_QUIT: |
305f78bf LP |
1125 | s->enabled = m; |
1126 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1127 | break; | |
1128 | ||
1129 | case SOURCE_DEFER: | |
baf76283 | 1130 | s->enabled = m; |
fd38203a LP |
1131 | break; |
1132 | } | |
1133 | ||
1134 | } else { | |
1135 | switch (s->type) { | |
1136 | ||
1137 | case SOURCE_IO: | |
1138 | r = source_io_register(s, m, s->io.events); | |
1139 | if (r < 0) | |
1140 | return r; | |
1141 | ||
baf76283 | 1142 | s->enabled = m; |
fd38203a LP |
1143 | break; |
1144 | ||
1145 | case SOURCE_MONOTONIC: | |
baf76283 | 1146 | s->enabled = m; |
c2ba3ad6 LP |
1147 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); |
1148 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
1149 | break; |
1150 | ||
1151 | case SOURCE_REALTIME: | |
baf76283 | 1152 | s->enabled = m; |
c2ba3ad6 LP |
1153 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); |
1154 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
1155 | break; |
1156 | ||
1157 | case SOURCE_SIGNAL: | |
baf76283 | 1158 | s->enabled = m; |
fd38203a | 1159 | |
baf76283 | 1160 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { |
fd38203a LP |
1161 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
1162 | event_update_signal_fd(s->event); | |
1163 | } | |
1164 | break; | |
1165 | ||
1166 | case SOURCE_CHILD: | |
baf76283 | 1167 | s->enabled = m; |
fd38203a | 1168 | |
baf76283 LP |
1169 | if (s->enabled == SD_EVENT_OFF) { |
1170 | s->event->n_enabled_child_sources++; | |
fd38203a LP |
1171 | |
1172 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1173 | assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0); | |
1174 | event_update_signal_fd(s->event); | |
1175 | } | |
1176 | } | |
1177 | break; | |
1178 | ||
da7e457c | 1179 | case SOURCE_QUIT: |
305f78bf LP |
1180 | s->enabled = m; |
1181 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1182 | break; | |
1183 | ||
1184 | case SOURCE_DEFER: | |
baf76283 | 1185 | s->enabled = m; |
fd38203a LP |
1186 | break; |
1187 | } | |
1188 | } | |
1189 | ||
1190 | if (s->pending) | |
1191 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1192 | ||
1193 | if (s->prepare) | |
1194 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1195 | ||
1196 | return 0; | |
1197 | } | |
1198 | ||
1199 | int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { | |
305f78bf LP |
1200 | assert_return(s, -EINVAL); |
1201 | assert_return(usec, -EINVAL); | |
1202 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1203 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1204 | |
1205 | *usec = s->time.next; | |
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { | |
305f78bf LP |
1210 | assert_return(s, -EINVAL); |
1211 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1212 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1213 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1214 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1215 | |
1216 | if (s->time.next == usec) | |
1217 | return 0; | |
1218 | ||
1219 | s->time.next = usec; | |
1220 | ||
c2ba3ad6 LP |
1221 | if (s->type == SOURCE_REALTIME) { |
1222 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); | |
1223 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1224 | } else { | |
1225 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); | |
1226 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1227 | } | |
fd38203a LP |
1228 | |
1229 | return 0; | |
1230 | } | |
1231 | ||
305f78bf LP |
1232 | int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
1233 | assert_return(s, -EINVAL); | |
1234 | assert_return(usec, -EINVAL); | |
1235 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1236 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1237 | ||
1238 | *usec = s->time.accuracy; | |
1239 | return 0; | |
1240 | } | |
1241 | ||
eaa3cbef | 1242 | int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
305f78bf LP |
1243 | assert_return(s, -EINVAL); |
1244 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1245 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1246 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1247 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1248 | |
1249 | if (usec == 0) | |
1250 | usec = DEFAULT_ACCURACY_USEC; | |
1251 | ||
1252 | if (s->time.accuracy == usec) | |
1253 | return 0; | |
1254 | ||
eaa3cbef LP |
1255 | s->time.accuracy = usec; |
1256 | ||
1257 | if (s->type == SOURCE_REALTIME) | |
1258 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1259 | else | |
1260 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1261 | ||
1262 | return 0; | |
1263 | } | |
1264 | ||
4bee8012 LP |
1265 | int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
1266 | assert_return(s, -EINVAL); | |
1267 | assert_return(pid, -EINVAL); | |
1268 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1269 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1270 | ||
1271 | *pid = s->child.pid; | |
1272 | return 0; | |
1273 | } | |
1274 | ||
fd38203a LP |
1275 | int sd_event_source_set_prepare(sd_event_source *s, sd_prepare_handler_t callback) { |
1276 | int r; | |
1277 | ||
da7e457c LP |
1278 | assert_return(s, -EINVAL); |
1279 | assert_return(s->type != SOURCE_QUIT, -EDOM); | |
1280 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); | |
1281 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1282 | |
1283 | if (s->prepare == callback) | |
1284 | return 0; | |
1285 | ||
1286 | if (callback && s->prepare) { | |
1287 | s->prepare = callback; | |
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1292 | if (r < 0) | |
1293 | return r; | |
1294 | ||
1295 | s->prepare = callback; | |
1296 | ||
1297 | if (callback) { | |
1298 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1299 | if (r < 0) | |
1300 | return r; | |
1301 | } else | |
1302 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1303 | ||
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | void* sd_event_source_get_userdata(sd_event_source *s) { | |
da7e457c | 1308 | assert_return(s, NULL); |
fd38203a LP |
1309 | |
1310 | return s->userdata; | |
1311 | } | |
1312 | ||
c2ba3ad6 LP |
1313 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1314 | usec_t c; | |
1315 | assert(e); | |
1316 | assert(a <= b); | |
1317 | ||
1318 | if (a <= 0) | |
1319 | return 0; | |
1320 | ||
1321 | if (b <= a + 1) | |
1322 | return a; | |
1323 | ||
1324 | /* | |
1325 | Find a good time to wake up again between times a and b. We | |
1326 | have two goals here: | |
1327 | ||
1328 | a) We want to wake up as seldom as possible, hence prefer | |
1329 | later times over earlier times. | |
1330 | ||
1331 | b) But if we have to wake up, then let's make sure to | |
1332 | dispatch as much as possible on the entire system. | |
1333 | ||
1334 | We implement this by waking up everywhere at the same time | |
1335 | within any given second if we can, synchronised via the | |
1336 | perturbation value determined from the boot ID. If we can't, | |
1337 | then we try to find the same spot in every a 250ms | |
1338 | step. Otherwise, we pick the last possible time to wake up. | |
1339 | */ | |
1340 | ||
1341 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + e->perturb; | |
1342 | if (c >= b) { | |
1343 | if (_unlikely_(c < USEC_PER_SEC)) | |
1344 | return b; | |
1345 | ||
1346 | c -= USEC_PER_SEC; | |
1347 | } | |
1348 | ||
1349 | if (c >= a) | |
1350 | return c; | |
1351 | ||
1352 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1353 | if (c >= b) { | |
1354 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1355 | return b; | |
1356 | ||
1357 | c -= USEC_PER_MSEC*250; | |
1358 | } | |
1359 | ||
1360 | if (c >= a) | |
1361 | return c; | |
1362 | ||
1363 | return b; | |
1364 | } | |
1365 | ||
fd38203a LP |
1366 | static int event_arm_timer( |
1367 | sd_event *e, | |
1368 | int timer_fd, | |
c2ba3ad6 LP |
1369 | Prioq *earliest, |
1370 | Prioq *latest, | |
fd38203a LP |
1371 | usec_t *next) { |
1372 | ||
1373 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1374 | sd_event_source *a, *b; |
1375 | usec_t t; | |
fd38203a LP |
1376 | int r; |
1377 | ||
1378 | assert_se(e); | |
1379 | assert_se(next); | |
1380 | ||
c2ba3ad6 | 1381 | a = prioq_peek(earliest); |
baf76283 | 1382 | if (!a || a->enabled == SD_EVENT_OFF) |
fd38203a LP |
1383 | return 0; |
1384 | ||
c2ba3ad6 | 1385 | b = prioq_peek(latest); |
baf76283 | 1386 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1387 | |
1388 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
1389 | if (*next == t) | |
fd38203a LP |
1390 | return 0; |
1391 | ||
1392 | assert_se(timer_fd >= 0); | |
1393 | ||
c2ba3ad6 | 1394 | if (t == 0) { |
fd38203a LP |
1395 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1396 | its.it_value.tv_sec = 0; | |
1397 | its.it_value.tv_nsec = 1; | |
1398 | } else | |
c2ba3ad6 | 1399 | timespec_store(&its.it_value, t); |
fd38203a LP |
1400 | |
1401 | r = timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1402 | if (r < 0) | |
1403 | return r; | |
1404 | ||
c2ba3ad6 | 1405 | *next = t; |
fd38203a LP |
1406 | return 0; |
1407 | } | |
1408 | ||
1409 | static int process_io(sd_event *e, sd_event_source *s, uint32_t events) { | |
1410 | assert(e); | |
1411 | assert(s); | |
1412 | assert(s->type == SOURCE_IO); | |
1413 | ||
1414 | s->io.revents = events; | |
1415 | ||
1416 | /* | |
1417 | If this is a oneshot event source, then we added it to the | |
1418 | epoll with EPOLLONESHOT, hence we know it's not registered | |
1419 | anymore. We can save a syscall here... | |
1420 | */ | |
1421 | ||
baf76283 | 1422 | if (s->enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
1423 | s->io.registered = false; |
1424 | ||
1425 | return source_set_pending(s, true); | |
1426 | } | |
1427 | ||
1428 | static int flush_timer(sd_event *e, int fd, uint32_t events) { | |
1429 | uint64_t x; | |
1430 | ssize_t ss; | |
1431 | ||
1432 | assert(e); | |
da7e457c | 1433 | assert(fd >= 0); |
305f78bf | 1434 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1435 | |
1436 | ss = read(fd, &x, sizeof(x)); | |
1437 | if (ss < 0) { | |
1438 | if (errno == EAGAIN || errno == EINTR) | |
1439 | return 0; | |
1440 | ||
1441 | return -errno; | |
1442 | } | |
1443 | ||
1444 | if (ss != sizeof(x)) | |
1445 | return -EIO; | |
1446 | ||
1447 | return 0; | |
1448 | } | |
1449 | ||
305f78bf LP |
1450 | static int process_timer( |
1451 | sd_event *e, | |
1452 | usec_t n, | |
1453 | Prioq *earliest, | |
1454 | Prioq *latest) { | |
1455 | ||
fd38203a LP |
1456 | sd_event_source *s; |
1457 | int r; | |
1458 | ||
1459 | assert(e); | |
1460 | ||
1461 | for (;;) { | |
c2ba3ad6 | 1462 | s = prioq_peek(earliest); |
fd38203a LP |
1463 | if (!s || |
1464 | s->time.next > n || | |
baf76283 | 1465 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1466 | s->pending) |
1467 | break; | |
1468 | ||
1469 | r = source_set_pending(s, true); | |
1470 | if (r < 0) | |
1471 | return r; | |
1472 | ||
c2ba3ad6 LP |
1473 | prioq_reshuffle(earliest, s, &s->time.earliest_index); |
1474 | prioq_reshuffle(latest, s, &s->time.latest_index); | |
fd38203a LP |
1475 | } |
1476 | ||
1477 | return 0; | |
1478 | } | |
1479 | ||
1480 | static int process_child(sd_event *e) { | |
1481 | sd_event_source *s; | |
1482 | Iterator i; | |
1483 | int r; | |
1484 | ||
1485 | assert(e); | |
1486 | ||
c2ba3ad6 LP |
1487 | e->need_process_child = false; |
1488 | ||
fd38203a LP |
1489 | /* |
1490 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1491 | + WNOHANG for each PID we wait for, instead of using | |
1492 | P_ALL. This is because we only want to get child | |
1493 | information of very specific child processes, and not all | |
1494 | of them. We might not have processed the SIGCHLD even of a | |
1495 | previous invocation and we don't want to maintain a | |
1496 | unbounded *per-child* event queue, hence we really don't | |
1497 | want anything flushed out of the kernel's queue that we | |
1498 | don't care about. Since this is O(n) this means that if you | |
1499 | have a lot of processes you probably want to handle SIGCHLD | |
1500 | yourself. | |
1501 | */ | |
1502 | ||
1503 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1504 | assert(s->type == SOURCE_CHILD); | |
1505 | ||
1506 | if (s->pending) | |
1507 | continue; | |
1508 | ||
baf76283 | 1509 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1510 | continue; |
1511 | ||
1512 | zero(s->child.siginfo); | |
1513 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|s->child.options); | |
1514 | if (r < 0) | |
1515 | return -errno; | |
1516 | ||
1517 | if (s->child.siginfo.si_pid != 0) { | |
1518 | r = source_set_pending(s, true); | |
1519 | if (r < 0) | |
1520 | return r; | |
1521 | } | |
1522 | } | |
1523 | ||
fd38203a LP |
1524 | return 0; |
1525 | } | |
1526 | ||
1527 | static int process_signal(sd_event *e, uint32_t events) { | |
1528 | struct signalfd_siginfo si; | |
1529 | bool read_one = false; | |
1530 | ssize_t ss; | |
1531 | int r; | |
1532 | ||
da7e457c | 1533 | assert(e); |
305f78bf | 1534 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1535 | |
1536 | for (;;) { | |
1537 | sd_event_source *s; | |
1538 | ||
1539 | ss = read(e->signal_fd, &si, sizeof(si)); | |
1540 | if (ss < 0) { | |
1541 | if (errno == EAGAIN || errno == EINTR) | |
1542 | return read_one; | |
1543 | ||
1544 | return -errno; | |
1545 | } | |
1546 | ||
1547 | if (ss != sizeof(si)) | |
1548 | return -EIO; | |
1549 | ||
1550 | read_one = true; | |
1551 | ||
1552 | if (si.ssi_signo == SIGCHLD) { | |
1553 | r = process_child(e); | |
1554 | if (r < 0) | |
1555 | return r; | |
1556 | if (r > 0 || !e->signal_sources[si.ssi_signo]) | |
1557 | continue; | |
1558 | } else { | |
1559 | s = e->signal_sources[si.ssi_signo]; | |
1560 | if (!s) | |
1561 | return -EIO; | |
1562 | } | |
1563 | ||
1564 | s->signal.siginfo = si; | |
1565 | r = source_set_pending(s, true); | |
1566 | if (r < 0) | |
1567 | return r; | |
1568 | } | |
1569 | ||
1570 | ||
1571 | return 0; | |
1572 | } | |
1573 | ||
1574 | static int source_dispatch(sd_event_source *s) { | |
1575 | int r; | |
1576 | ||
1577 | assert(s); | |
da7e457c | 1578 | assert(s->pending || s->type == SOURCE_QUIT); |
fd38203a | 1579 | |
da7e457c LP |
1580 | if (s->type != SOURCE_DEFER && s->type != SOURCE_QUIT) { |
1581 | r = source_set_pending(s, false); | |
1582 | if (r < 0) | |
1583 | return r; | |
1584 | } | |
fd38203a | 1585 | |
baf76283 LP |
1586 | if (s->enabled == SD_EVENT_ONESHOT) { |
1587 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
1588 | if (r < 0) |
1589 | return r; | |
1590 | } | |
1591 | ||
1592 | switch (s->type) { | |
1593 | ||
1594 | case SOURCE_IO: | |
1595 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
1596 | break; | |
1597 | ||
1598 | case SOURCE_MONOTONIC: | |
1599 | r = s->time.callback(s, s->time.next, s->userdata); | |
1600 | break; | |
1601 | ||
1602 | case SOURCE_REALTIME: | |
1603 | r = s->time.callback(s, s->time.next, s->userdata); | |
1604 | break; | |
1605 | ||
1606 | case SOURCE_SIGNAL: | |
1607 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
1608 | break; | |
1609 | ||
1610 | case SOURCE_CHILD: | |
1611 | r = s->child.callback(s, &s->child.siginfo, s->userdata); | |
1612 | break; | |
1613 | ||
1614 | case SOURCE_DEFER: | |
1615 | r = s->defer.callback(s, s->userdata); | |
1616 | break; | |
da7e457c LP |
1617 | |
1618 | case SOURCE_QUIT: | |
1619 | r = s->quit.callback(s, s->userdata); | |
1620 | break; | |
fd38203a LP |
1621 | } |
1622 | ||
1623 | return r; | |
1624 | } | |
1625 | ||
1626 | static int event_prepare(sd_event *e) { | |
1627 | int r; | |
1628 | ||
1629 | assert(e); | |
1630 | ||
1631 | for (;;) { | |
1632 | sd_event_source *s; | |
1633 | ||
1634 | s = prioq_peek(e->prepare); | |
baf76283 | 1635 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1636 | break; |
1637 | ||
1638 | s->prepare_iteration = e->iteration; | |
1639 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
1640 | if (r < 0) | |
1641 | return r; | |
1642 | ||
1643 | assert(s->prepare); | |
1644 | r = s->prepare(s, s->userdata); | |
1645 | if (r < 0) | |
1646 | return r; | |
1647 | ||
1648 | } | |
1649 | ||
1650 | return 0; | |
1651 | } | |
1652 | ||
da7e457c LP |
1653 | static int dispatch_quit(sd_event *e) { |
1654 | sd_event_source *p; | |
1655 | int r; | |
1656 | ||
1657 | assert(e); | |
1658 | ||
1659 | p = prioq_peek(e->quit); | |
baf76283 | 1660 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
1661 | e->state = SD_EVENT_FINISHED; |
1662 | return 0; | |
1663 | } | |
1664 | ||
1665 | sd_event_ref(e); | |
1666 | e->iteration++; | |
1667 | e->state = SD_EVENT_QUITTING; | |
1668 | ||
1669 | r = source_dispatch(p); | |
1670 | ||
1671 | e->state = SD_EVENT_PASSIVE; | |
1672 | sd_event_unref(e); | |
1673 | ||
1674 | return r; | |
1675 | } | |
1676 | ||
c2ba3ad6 LP |
1677 | static sd_event_source* event_next_pending(sd_event *e) { |
1678 | sd_event_source *p; | |
1679 | ||
da7e457c LP |
1680 | assert(e); |
1681 | ||
c2ba3ad6 LP |
1682 | p = prioq_peek(e->pending); |
1683 | if (!p) | |
1684 | return NULL; | |
1685 | ||
baf76283 | 1686 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
1687 | return NULL; |
1688 | ||
1689 | return p; | |
1690 | } | |
1691 | ||
fd38203a LP |
1692 | int sd_event_run(sd_event *e, uint64_t timeout) { |
1693 | struct epoll_event ev_queue[EPOLL_QUEUE_MAX]; | |
1694 | sd_event_source *p; | |
fd38203a | 1695 | dual_timestamp n; |
305f78bf | 1696 | int r, i, m; |
fd38203a | 1697 | |
da7e457c LP |
1698 | assert_return(e, -EINVAL); |
1699 | assert_return(!event_pid_changed(e), -ECHILD); | |
1700 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1701 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
1702 | ||
1703 | if (e->quit_requested) | |
1704 | return dispatch_quit(e); | |
fd38203a | 1705 | |
da7e457c | 1706 | sd_event_ref(e); |
fd38203a | 1707 | e->iteration++; |
da7e457c | 1708 | e->state = SD_EVENT_RUNNING; |
fd38203a LP |
1709 | |
1710 | r = event_prepare(e); | |
1711 | if (r < 0) | |
da7e457c | 1712 | goto finish; |
fd38203a | 1713 | |
c2ba3ad6 LP |
1714 | if (event_next_pending(e) || e->need_process_child) |
1715 | timeout = 0; | |
fd38203a | 1716 | |
c2ba3ad6 LP |
1717 | if (timeout > 0) { |
1718 | r = event_arm_timer(e, e->monotonic_fd, e->monotonic_earliest, e->monotonic_latest, &e->monotonic_next); | |
1719 | if (r < 0) | |
da7e457c | 1720 | goto finish; |
fd38203a | 1721 | |
c2ba3ad6 LP |
1722 | r = event_arm_timer(e, e->realtime_fd, e->realtime_earliest, e->realtime_latest, &e->realtime_next); |
1723 | if (r < 0) | |
da7e457c | 1724 | goto finish; |
fd38203a LP |
1725 | } |
1726 | ||
c2ba3ad6 LP |
1727 | m = epoll_wait(e->epoll_fd, ev_queue, EPOLL_QUEUE_MAX, |
1728 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); | |
da7e457c LP |
1729 | if (m < 0) { |
1730 | r = m; | |
1731 | goto finish; | |
1732 | } | |
fd38203a LP |
1733 | |
1734 | dual_timestamp_get(&n); | |
1735 | ||
1736 | for (i = 0; i < m; i++) { | |
1737 | ||
1738 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_MONOTONIC)) | |
1739 | r = flush_timer(e, e->monotonic_fd, ev_queue[i].events); | |
1740 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_REALTIME)) | |
1741 | r = flush_timer(e, e->realtime_fd, ev_queue[i].events); | |
1742 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) | |
1743 | r = process_signal(e, ev_queue[i].events); | |
1744 | else | |
1745 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
1746 | ||
1747 | if (r < 0) | |
da7e457c | 1748 | goto finish; |
fd38203a LP |
1749 | } |
1750 | ||
c2ba3ad6 | 1751 | r = process_timer(e, n.monotonic, e->monotonic_earliest, e->monotonic_latest); |
fd38203a | 1752 | if (r < 0) |
da7e457c | 1753 | goto finish; |
fd38203a | 1754 | |
c2ba3ad6 | 1755 | r = process_timer(e, n.realtime, e->realtime_earliest, e->realtime_latest); |
fd38203a | 1756 | if (r < 0) |
da7e457c | 1757 | goto finish; |
fd38203a | 1758 | |
c2ba3ad6 | 1759 | if (e->need_process_child) { |
fd38203a LP |
1760 | r = process_child(e); |
1761 | if (r < 0) | |
da7e457c | 1762 | goto finish; |
fd38203a LP |
1763 | } |
1764 | ||
c2ba3ad6 | 1765 | p = event_next_pending(e); |
da7e457c LP |
1766 | if (!p) { |
1767 | r = 0; | |
1768 | goto finish; | |
1769 | } | |
1770 | ||
1771 | r = source_dispatch(p); | |
fd38203a | 1772 | |
da7e457c LP |
1773 | finish: |
1774 | e->state = SD_EVENT_PASSIVE; | |
1775 | sd_event_unref(e); | |
1776 | ||
1777 | return r; | |
fd38203a LP |
1778 | } |
1779 | ||
1780 | int sd_event_loop(sd_event *e) { | |
1781 | int r; | |
1782 | ||
da7e457c LP |
1783 | assert_return(e, -EINVAL); |
1784 | assert_return(!event_pid_changed(e), -ECHILD); | |
1785 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
1786 | ||
1787 | sd_event_ref(e); | |
fd38203a | 1788 | |
da7e457c | 1789 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
1790 | r = sd_event_run(e, (uint64_t) -1); |
1791 | if (r < 0) | |
da7e457c | 1792 | goto finish; |
fd38203a LP |
1793 | } |
1794 | ||
da7e457c LP |
1795 | r = 0; |
1796 | ||
1797 | finish: | |
1798 | sd_event_unref(e); | |
1799 | return r; | |
fd38203a LP |
1800 | } |
1801 | ||
da7e457c LP |
1802 | int sd_event_get_state(sd_event *e) { |
1803 | assert_return(e, -EINVAL); | |
1804 | assert_return(!event_pid_changed(e), -ECHILD); | |
1805 | ||
1806 | return e->state; | |
1807 | } | |
1808 | ||
1809 | int sd_event_get_quit(sd_event *e) { | |
1810 | assert_return(e, -EINVAL); | |
1811 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 1812 | |
da7e457c | 1813 | return e->quit_requested; |
fd38203a LP |
1814 | } |
1815 | ||
1816 | int sd_event_request_quit(sd_event *e) { | |
da7e457c LP |
1817 | assert_return(e, -EINVAL); |
1818 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1819 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 1820 | |
da7e457c | 1821 | e->quit_requested = true; |
fd38203a LP |
1822 | return 0; |
1823 | } |