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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 | ||
afc6adb5 | 26 | #include "sd-id128.h" |
cde93897 | 27 | #include "sd-daemon.h" |
fd38203a | 28 | #include "macro.h" |
fd38203a LP |
29 | #include "prioq.h" |
30 | #include "hashmap.h" | |
31 | #include "util.h" | |
32 | #include "time-util.h" | |
afc6adb5 | 33 | #include "missing.h" |
fd38203a LP |
34 | |
35 | #include "sd-event.h" | |
36 | ||
15b38f93 | 37 | #define EPOLL_QUEUE_MAX 512U |
c2ba3ad6 | 38 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
39 | |
40 | typedef enum EventSourceType { | |
41 | SOURCE_IO, | |
42 | SOURCE_MONOTONIC, | |
43 | SOURCE_REALTIME, | |
44 | SOURCE_SIGNAL, | |
45 | SOURCE_CHILD, | |
da7e457c | 46 | SOURCE_DEFER, |
6203e07a | 47 | SOURCE_EXIT, |
cde93897 | 48 | SOURCE_WATCHDOG |
fd38203a LP |
49 | } EventSourceType; |
50 | ||
51 | struct sd_event_source { | |
da7e457c | 52 | unsigned n_ref; |
fd38203a LP |
53 | |
54 | sd_event *event; | |
55 | void *userdata; | |
718db961 | 56 | sd_event_handler_t prepare; |
fd38203a LP |
57 | |
58 | EventSourceType type:4; | |
baf76283 | 59 | int enabled:3; |
fd38203a | 60 | bool pending:1; |
12179984 | 61 | bool dispatching:1; |
fd38203a LP |
62 | |
63 | int priority; | |
64 | unsigned pending_index; | |
65 | unsigned prepare_index; | |
66 | unsigned pending_iteration; | |
67 | unsigned prepare_iteration; | |
68 | ||
69 | union { | |
70 | struct { | |
718db961 | 71 | sd_event_io_handler_t callback; |
fd38203a LP |
72 | int fd; |
73 | uint32_t events; | |
74 | uint32_t revents; | |
75 | bool registered:1; | |
76 | } io; | |
77 | struct { | |
718db961 | 78 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
79 | usec_t next, accuracy; |
80 | unsigned earliest_index; | |
81 | unsigned latest_index; | |
fd38203a LP |
82 | } time; |
83 | struct { | |
718db961 | 84 | sd_event_signal_handler_t callback; |
fd38203a LP |
85 | struct signalfd_siginfo siginfo; |
86 | int sig; | |
87 | } signal; | |
88 | struct { | |
718db961 | 89 | sd_event_child_handler_t callback; |
fd38203a LP |
90 | siginfo_t siginfo; |
91 | pid_t pid; | |
92 | int options; | |
93 | } child; | |
94 | struct { | |
718db961 | 95 | sd_event_handler_t callback; |
fd38203a | 96 | } defer; |
da7e457c | 97 | struct { |
718db961 | 98 | sd_event_handler_t callback; |
da7e457c | 99 | unsigned prioq_index; |
6203e07a | 100 | } exit; |
fd38203a LP |
101 | }; |
102 | }; | |
103 | ||
104 | struct sd_event { | |
da7e457c | 105 | unsigned n_ref; |
fd38203a LP |
106 | |
107 | int epoll_fd; | |
108 | int signal_fd; | |
109 | int realtime_fd; | |
110 | int monotonic_fd; | |
cde93897 | 111 | int watchdog_fd; |
fd38203a LP |
112 | |
113 | Prioq *pending; | |
114 | Prioq *prepare; | |
c2ba3ad6 LP |
115 | |
116 | /* For both clocks we maintain two priority queues each, one | |
117 | * ordered for the earliest times the events may be | |
118 | * dispatched, and one ordered by the latest times they must | |
119 | * have been dispatched. The range between the top entries in | |
120 | * the two prioqs is the time window we can freely schedule | |
121 | * wakeups in */ | |
122 | Prioq *monotonic_earliest; | |
123 | Prioq *monotonic_latest; | |
124 | Prioq *realtime_earliest; | |
125 | Prioq *realtime_latest; | |
fd38203a | 126 | |
da7e457c LP |
127 | usec_t realtime_next, monotonic_next; |
128 | usec_t perturb; | |
129 | ||
fd38203a LP |
130 | sigset_t sigset; |
131 | sd_event_source **signal_sources; | |
132 | ||
133 | Hashmap *child_sources; | |
baf76283 | 134 | unsigned n_enabled_child_sources; |
fd38203a | 135 | |
6203e07a | 136 | Prioq *exit; |
fd38203a | 137 | |
da7e457c | 138 | pid_t original_pid; |
c2ba3ad6 | 139 | |
da7e457c | 140 | unsigned iteration; |
46e8c825 | 141 | dual_timestamp timestamp; |
da7e457c | 142 | int state; |
eaa3cbef | 143 | |
6203e07a | 144 | bool exit_requested:1; |
da7e457c | 145 | bool need_process_child:1; |
cde93897 | 146 | bool watchdog:1; |
afc6adb5 | 147 | |
6203e07a LP |
148 | int exit_code; |
149 | ||
afc6adb5 LP |
150 | pid_t tid; |
151 | sd_event **default_event_ptr; | |
cde93897 LP |
152 | |
153 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
154 | |
155 | unsigned n_sources; | |
fd38203a LP |
156 | }; |
157 | ||
158 | static int pending_prioq_compare(const void *a, const void *b) { | |
159 | const sd_event_source *x = a, *y = b; | |
160 | ||
161 | assert(x->pending); | |
162 | assert(y->pending); | |
163 | ||
baf76283 LP |
164 | /* Enabled ones first */ |
165 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 166 | return -1; |
baf76283 | 167 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
168 | return 1; |
169 | ||
170 | /* Lower priority values first */ | |
171 | if (x->priority < y->priority) | |
172 | return -1; | |
173 | if (x->priority > y->priority) | |
174 | return 1; | |
175 | ||
176 | /* Older entries first */ | |
177 | if (x->pending_iteration < y->pending_iteration) | |
178 | return -1; | |
179 | if (x->pending_iteration > y->pending_iteration) | |
180 | return 1; | |
181 | ||
182 | /* Stability for the rest */ | |
183 | if (x < y) | |
184 | return -1; | |
dfcd88f6 | 185 | if (x > y) |
fd38203a LP |
186 | return 1; |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | static int prepare_prioq_compare(const void *a, const void *b) { | |
192 | const sd_event_source *x = a, *y = b; | |
193 | ||
194 | assert(x->prepare); | |
195 | assert(y->prepare); | |
196 | ||
197 | /* Move most recently prepared ones last, so that we can stop | |
198 | * preparing as soon as we hit one that has already been | |
199 | * prepared in the current iteration */ | |
200 | if (x->prepare_iteration < y->prepare_iteration) | |
201 | return -1; | |
202 | if (x->prepare_iteration > y->prepare_iteration) | |
203 | return 1; | |
204 | ||
baf76283 LP |
205 | /* Enabled ones first */ |
206 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 207 | return -1; |
baf76283 | 208 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
209 | return 1; |
210 | ||
211 | /* Lower priority values first */ | |
212 | if (x->priority < y->priority) | |
213 | return -1; | |
214 | if (x->priority > y->priority) | |
215 | return 1; | |
216 | ||
217 | /* Stability for the rest */ | |
218 | if (x < y) | |
219 | return -1; | |
dfcd88f6 | 220 | if (x > y) |
fd38203a LP |
221 | return 1; |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
c2ba3ad6 | 226 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
227 | const sd_event_source *x = a, *y = b; |
228 | ||
229 | assert(x->type == SOURCE_MONOTONIC || x->type == SOURCE_REALTIME); | |
230 | assert(y->type == SOURCE_MONOTONIC || y->type == SOURCE_REALTIME); | |
231 | ||
baf76283 LP |
232 | /* Enabled ones first */ |
233 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 234 | return -1; |
baf76283 | 235 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
236 | return 1; |
237 | ||
238 | /* Move the pending ones to the end */ | |
239 | if (!x->pending && y->pending) | |
240 | return -1; | |
241 | if (x->pending && !y->pending) | |
242 | return 1; | |
243 | ||
244 | /* Order by time */ | |
245 | if (x->time.next < y->time.next) | |
246 | return -1; | |
247 | if (x->time.next > y->time.next) | |
a99badf5 | 248 | return 1; |
fd38203a LP |
249 | |
250 | /* Stability for the rest */ | |
251 | if (x < y) | |
252 | return -1; | |
dfcd88f6 | 253 | if (x > y) |
fd38203a LP |
254 | return 1; |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
c2ba3ad6 LP |
259 | static int latest_time_prioq_compare(const void *a, const void *b) { |
260 | const sd_event_source *x = a, *y = b; | |
261 | ||
da7e457c LP |
262 | assert((x->type == SOURCE_MONOTONIC && y->type == SOURCE_MONOTONIC) || |
263 | (x->type == SOURCE_REALTIME && y->type == SOURCE_REALTIME)); | |
c2ba3ad6 | 264 | |
baf76283 LP |
265 | /* Enabled ones first */ |
266 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 267 | return -1; |
baf76283 | 268 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
269 | return 1; |
270 | ||
271 | /* Move the pending ones to the end */ | |
272 | if (!x->pending && y->pending) | |
273 | return -1; | |
274 | if (x->pending && !y->pending) | |
275 | return 1; | |
276 | ||
277 | /* Order by time */ | |
278 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
279 | return -1; | |
280 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
a99badf5 | 281 | return 1; |
c2ba3ad6 LP |
282 | |
283 | /* Stability for the rest */ | |
284 | if (x < y) | |
285 | return -1; | |
286 | if (x > y) | |
287 | return 1; | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
6203e07a | 292 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
293 | const sd_event_source *x = a, *y = b; |
294 | ||
6203e07a LP |
295 | assert(x->type == SOURCE_EXIT); |
296 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 297 | |
baf76283 LP |
298 | /* Enabled ones first */ |
299 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 300 | return -1; |
baf76283 | 301 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
302 | return 1; |
303 | ||
304 | /* Lower priority values first */ | |
305 | if (x->priority < y->priority) | |
306 | return -1; | |
307 | if (x->priority > y->priority) | |
308 | return 1; | |
309 | ||
310 | /* Stability for the rest */ | |
311 | if (x < y) | |
312 | return -1; | |
313 | if (x > y) | |
314 | return 1; | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
fd38203a LP |
319 | static void event_free(sd_event *e) { |
320 | assert(e); | |
15b38f93 | 321 | assert(e->n_sources == 0); |
fd38203a | 322 | |
afc6adb5 LP |
323 | if (e->default_event_ptr) |
324 | *(e->default_event_ptr) = NULL; | |
325 | ||
fd38203a LP |
326 | if (e->epoll_fd >= 0) |
327 | close_nointr_nofail(e->epoll_fd); | |
328 | ||
329 | if (e->signal_fd >= 0) | |
330 | close_nointr_nofail(e->signal_fd); | |
331 | ||
332 | if (e->realtime_fd >= 0) | |
333 | close_nointr_nofail(e->realtime_fd); | |
334 | ||
335 | if (e->monotonic_fd >= 0) | |
336 | close_nointr_nofail(e->monotonic_fd); | |
337 | ||
cde93897 LP |
338 | if (e->watchdog_fd >= 0) |
339 | close_nointr_nofail(e->watchdog_fd); | |
340 | ||
fd38203a LP |
341 | prioq_free(e->pending); |
342 | prioq_free(e->prepare); | |
c2ba3ad6 LP |
343 | prioq_free(e->monotonic_earliest); |
344 | prioq_free(e->monotonic_latest); | |
345 | prioq_free(e->realtime_earliest); | |
346 | prioq_free(e->realtime_latest); | |
6203e07a | 347 | prioq_free(e->exit); |
fd38203a LP |
348 | |
349 | free(e->signal_sources); | |
350 | ||
351 | hashmap_free(e->child_sources); | |
352 | free(e); | |
353 | } | |
354 | ||
f7262a9f | 355 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
356 | sd_event *e; |
357 | int r; | |
358 | ||
305f78bf | 359 | assert_return(ret, -EINVAL); |
fd38203a LP |
360 | |
361 | e = new0(sd_event, 1); | |
362 | if (!e) | |
363 | return -ENOMEM; | |
364 | ||
da7e457c | 365 | e->n_ref = 1; |
cde93897 | 366 | e->signal_fd = e->realtime_fd = e->monotonic_fd = e->watchdog_fd = e->epoll_fd = -1; |
fd38203a | 367 | e->realtime_next = e->monotonic_next = (usec_t) -1; |
eaa3cbef | 368 | e->original_pid = getpid(); |
fd38203a LP |
369 | |
370 | assert_se(sigemptyset(&e->sigset) == 0); | |
371 | ||
372 | e->pending = prioq_new(pending_prioq_compare); | |
373 | if (!e->pending) { | |
374 | r = -ENOMEM; | |
375 | goto fail; | |
376 | } | |
377 | ||
378 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
379 | if (e->epoll_fd < 0) { | |
380 | r = -errno; | |
381 | goto fail; | |
382 | } | |
383 | ||
384 | *ret = e; | |
385 | return 0; | |
386 | ||
387 | fail: | |
388 | event_free(e); | |
389 | return r; | |
390 | } | |
391 | ||
f7262a9f | 392 | _public_ sd_event* sd_event_ref(sd_event *e) { |
305f78bf | 393 | assert_return(e, NULL); |
fd38203a | 394 | |
da7e457c LP |
395 | assert(e->n_ref >= 1); |
396 | e->n_ref++; | |
fd38203a LP |
397 | |
398 | return e; | |
399 | } | |
400 | ||
f7262a9f | 401 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
402 | |
403 | if (!e) | |
404 | return NULL; | |
fd38203a | 405 | |
da7e457c LP |
406 | assert(e->n_ref >= 1); |
407 | e->n_ref--; | |
408 | ||
409 | if (e->n_ref <= 0) | |
fd38203a LP |
410 | event_free(e); |
411 | ||
412 | return NULL; | |
413 | } | |
414 | ||
eaa3cbef LP |
415 | static bool event_pid_changed(sd_event *e) { |
416 | assert(e); | |
417 | ||
418 | /* We don't support people creating am event loop and keeping | |
419 | * it around over a fork(). Let's complain. */ | |
420 | ||
421 | return e->original_pid != getpid(); | |
422 | } | |
423 | ||
fd38203a LP |
424 | static int source_io_unregister(sd_event_source *s) { |
425 | int r; | |
426 | ||
427 | assert(s); | |
428 | assert(s->type == SOURCE_IO); | |
429 | ||
430 | if (!s->io.registered) | |
431 | return 0; | |
432 | ||
433 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
434 | if (r < 0) | |
435 | return -errno; | |
436 | ||
437 | s->io.registered = false; | |
438 | return 0; | |
439 | } | |
440 | ||
305f78bf LP |
441 | static int source_io_register( |
442 | sd_event_source *s, | |
443 | int enabled, | |
444 | uint32_t events) { | |
445 | ||
fd38203a LP |
446 | struct epoll_event ev = {}; |
447 | int r; | |
448 | ||
449 | assert(s); | |
450 | assert(s->type == SOURCE_IO); | |
baf76283 | 451 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
452 | |
453 | ev.events = events; | |
454 | ev.data.ptr = s; | |
455 | ||
baf76283 | 456 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
457 | ev.events |= EPOLLONESHOT; |
458 | ||
459 | if (s->io.registered) | |
460 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
461 | else | |
462 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
463 | ||
464 | if (r < 0) | |
465 | return -errno; | |
466 | ||
467 | s->io.registered = true; | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
472 | static void source_free(sd_event_source *s) { | |
473 | assert(s); | |
474 | ||
475 | if (s->event) { | |
15b38f93 LP |
476 | assert(s->event->n_sources > 0); |
477 | ||
fd38203a LP |
478 | switch (s->type) { |
479 | ||
480 | case SOURCE_IO: | |
481 | if (s->io.fd >= 0) | |
482 | source_io_unregister(s); | |
483 | ||
484 | break; | |
485 | ||
486 | case SOURCE_MONOTONIC: | |
c2ba3ad6 LP |
487 | prioq_remove(s->event->monotonic_earliest, s, &s->time.earliest_index); |
488 | prioq_remove(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
489 | break; |
490 | ||
491 | case SOURCE_REALTIME: | |
c2ba3ad6 LP |
492 | prioq_remove(s->event->realtime_earliest, s, &s->time.earliest_index); |
493 | prioq_remove(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
494 | break; |
495 | ||
496 | case SOURCE_SIGNAL: | |
497 | if (s->signal.sig > 0) { | |
baf76283 | 498 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) |
fd38203a LP |
499 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
500 | ||
501 | if (s->event->signal_sources) | |
502 | s->event->signal_sources[s->signal.sig] = NULL; | |
503 | } | |
504 | ||
505 | break; | |
506 | ||
507 | case SOURCE_CHILD: | |
508 | if (s->child.pid > 0) { | |
baf76283 LP |
509 | if (s->enabled != SD_EVENT_OFF) { |
510 | assert(s->event->n_enabled_child_sources > 0); | |
511 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
512 | } |
513 | ||
514 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) | |
515 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
516 | ||
517 | hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid)); | |
518 | } | |
519 | ||
520 | break; | |
da7e457c | 521 | |
0eb2e0e3 ZJS |
522 | case SOURCE_DEFER: |
523 | /* nothing */ | |
524 | break; | |
525 | ||
6203e07a LP |
526 | case SOURCE_EXIT: |
527 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
da7e457c | 528 | break; |
9d3e3aa5 LP |
529 | |
530 | case SOURCE_WATCHDOG: | |
531 | assert_not_reached("Wut? I shouldn't exist."); | |
fd38203a LP |
532 | } |
533 | ||
534 | if (s->pending) | |
535 | prioq_remove(s->event->pending, s, &s->pending_index); | |
536 | ||
537 | if (s->prepare) | |
538 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
539 | ||
15b38f93 | 540 | s->event->n_sources--; |
fd38203a LP |
541 | sd_event_unref(s->event); |
542 | } | |
543 | ||
544 | free(s); | |
545 | } | |
546 | ||
547 | static int source_set_pending(sd_event_source *s, bool b) { | |
548 | int r; | |
549 | ||
550 | assert(s); | |
6203e07a | 551 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
552 | |
553 | if (s->pending == b) | |
554 | return 0; | |
555 | ||
556 | s->pending = b; | |
557 | ||
558 | if (b) { | |
559 | s->pending_iteration = s->event->iteration; | |
560 | ||
561 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
562 | if (r < 0) { | |
563 | s->pending = false; | |
564 | return r; | |
565 | } | |
566 | } else | |
567 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
568 | ||
2576a19e LP |
569 | if (s->type == SOURCE_REALTIME) { |
570 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); | |
571 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
572 | } else if (s->type == SOURCE_MONOTONIC) { | |
573 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); | |
574 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
575 | } | |
576 | ||
fd38203a LP |
577 | return 0; |
578 | } | |
579 | ||
580 | static sd_event_source *source_new(sd_event *e, EventSourceType type) { | |
581 | sd_event_source *s; | |
582 | ||
583 | assert(e); | |
584 | ||
585 | s = new0(sd_event_source, 1); | |
586 | if (!s) | |
587 | return NULL; | |
588 | ||
da7e457c | 589 | s->n_ref = 1; |
fd38203a LP |
590 | s->event = sd_event_ref(e); |
591 | s->type = type; | |
fd38203a LP |
592 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
593 | ||
15b38f93 LP |
594 | e->n_sources ++; |
595 | ||
fd38203a LP |
596 | return s; |
597 | } | |
598 | ||
f7262a9f | 599 | _public_ int sd_event_add_io( |
fd38203a LP |
600 | sd_event *e, |
601 | int fd, | |
602 | uint32_t events, | |
718db961 | 603 | sd_event_io_handler_t callback, |
fd38203a LP |
604 | void *userdata, |
605 | sd_event_source **ret) { | |
606 | ||
607 | sd_event_source *s; | |
608 | int r; | |
609 | ||
305f78bf LP |
610 | assert_return(e, -EINVAL); |
611 | assert_return(fd >= 0, -EINVAL); | |
2a16a986 | 612 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf LP |
613 | assert_return(callback, -EINVAL); |
614 | assert_return(ret, -EINVAL); | |
da7e457c | 615 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 616 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
617 | |
618 | s = source_new(e, SOURCE_IO); | |
619 | if (!s) | |
620 | return -ENOMEM; | |
621 | ||
622 | s->io.fd = fd; | |
623 | s->io.events = events; | |
624 | s->io.callback = callback; | |
625 | s->userdata = userdata; | |
baf76283 | 626 | s->enabled = SD_EVENT_ON; |
fd38203a | 627 | |
baf76283 | 628 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
629 | if (r < 0) { |
630 | source_free(s); | |
631 | return -errno; | |
632 | } | |
633 | ||
634 | *ret = s; | |
635 | return 0; | |
636 | } | |
637 | ||
638 | static int event_setup_timer_fd( | |
639 | sd_event *e, | |
640 | EventSourceType type, | |
641 | int *timer_fd, | |
642 | clockid_t id) { | |
643 | ||
644 | struct epoll_event ev = {}; | |
645 | int r, fd; | |
c2ba3ad6 | 646 | sd_id128_t bootid; |
fd38203a LP |
647 | |
648 | assert(e); | |
649 | assert(timer_fd); | |
650 | ||
651 | if (_likely_(*timer_fd >= 0)) | |
652 | return 0; | |
653 | ||
654 | fd = timerfd_create(id, TFD_NONBLOCK|TFD_CLOEXEC); | |
655 | if (fd < 0) | |
656 | return -errno; | |
657 | ||
658 | ev.events = EPOLLIN; | |
659 | ev.data.ptr = INT_TO_PTR(type); | |
660 | ||
661 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
662 | if (r < 0) { | |
663 | close_nointr_nofail(fd); | |
664 | return -errno; | |
665 | } | |
666 | ||
c2ba3ad6 | 667 | /* When we sleep for longer, we try to realign the wakeup to |
850516e0 LP |
668 | the same time wihtin each minute/second/250ms, so that |
669 | events all across the system can be coalesced into a single | |
670 | CPU wakeup. However, let's take some system-specific | |
671 | randomness for this value, so that in a network of systems | |
672 | with synced clocks timer events are distributed a | |
673 | bit. Here, we calculate a perturbation usec offset from the | |
674 | boot ID. */ | |
c2ba3ad6 LP |
675 | |
676 | if (sd_id128_get_boot(&bootid) >= 0) | |
850516e0 | 677 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; |
c2ba3ad6 | 678 | |
fd38203a LP |
679 | *timer_fd = fd; |
680 | return 0; | |
681 | } | |
682 | ||
683 | static int event_add_time_internal( | |
684 | sd_event *e, | |
685 | EventSourceType type, | |
686 | int *timer_fd, | |
687 | clockid_t id, | |
c2ba3ad6 LP |
688 | Prioq **earliest, |
689 | Prioq **latest, | |
fd38203a | 690 | uint64_t usec, |
c2ba3ad6 | 691 | uint64_t accuracy, |
718db961 | 692 | sd_event_time_handler_t callback, |
fd38203a LP |
693 | void *userdata, |
694 | sd_event_source **ret) { | |
695 | ||
696 | sd_event_source *s; | |
697 | int r; | |
698 | ||
305f78bf LP |
699 | assert_return(e, -EINVAL); |
700 | assert_return(callback, -EINVAL); | |
701 | assert_return(ret, -EINVAL); | |
702 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
703 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
da7e457c | 704 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 705 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
706 | |
707 | assert(timer_fd); | |
c2ba3ad6 LP |
708 | assert(earliest); |
709 | assert(latest); | |
710 | ||
711 | if (!*earliest) { | |
712 | *earliest = prioq_new(earliest_time_prioq_compare); | |
713 | if (!*earliest) | |
714 | return -ENOMEM; | |
715 | } | |
fd38203a | 716 | |
c2ba3ad6 LP |
717 | if (!*latest) { |
718 | *latest = prioq_new(latest_time_prioq_compare); | |
719 | if (!*latest) | |
fd38203a LP |
720 | return -ENOMEM; |
721 | } | |
722 | ||
723 | if (*timer_fd < 0) { | |
724 | r = event_setup_timer_fd(e, type, timer_fd, id); | |
725 | if (r < 0) | |
726 | return r; | |
727 | } | |
728 | ||
729 | s = source_new(e, type); | |
730 | if (!s) | |
731 | return -ENOMEM; | |
732 | ||
733 | s->time.next = usec; | |
c2ba3ad6 | 734 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 735 | s->time.callback = callback; |
da7e457c | 736 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 737 | s->userdata = userdata; |
baf76283 | 738 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 739 | |
c2ba3ad6 LP |
740 | r = prioq_put(*earliest, s, &s->time.earliest_index); |
741 | if (r < 0) | |
742 | goto fail; | |
743 | ||
744 | r = prioq_put(*latest, s, &s->time.latest_index); | |
745 | if (r < 0) | |
746 | goto fail; | |
fd38203a LP |
747 | |
748 | *ret = s; | |
749 | return 0; | |
c2ba3ad6 LP |
750 | |
751 | fail: | |
752 | source_free(s); | |
753 | return r; | |
fd38203a LP |
754 | } |
755 | ||
f7262a9f ZJS |
756 | _public_ int sd_event_add_monotonic(sd_event *e, |
757 | uint64_t usec, | |
758 | uint64_t accuracy, | |
718db961 | 759 | sd_event_time_handler_t callback, |
f7262a9f ZJS |
760 | void *userdata, |
761 | sd_event_source **ret) { | |
762 | ||
c2ba3ad6 | 763 | 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 |
764 | } |
765 | ||
f7262a9f ZJS |
766 | _public_ int sd_event_add_realtime(sd_event *e, |
767 | uint64_t usec, | |
768 | uint64_t accuracy, | |
718db961 | 769 | sd_event_time_handler_t callback, |
f7262a9f ZJS |
770 | void *userdata, |
771 | sd_event_source **ret) { | |
772 | ||
c2ba3ad6 | 773 | 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 |
774 | } |
775 | ||
776 | static int event_update_signal_fd(sd_event *e) { | |
777 | struct epoll_event ev = {}; | |
778 | bool add_to_epoll; | |
779 | int r; | |
780 | ||
781 | assert(e); | |
782 | ||
783 | add_to_epoll = e->signal_fd < 0; | |
784 | ||
785 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
786 | if (r < 0) | |
787 | return -errno; | |
788 | ||
789 | e->signal_fd = r; | |
790 | ||
791 | if (!add_to_epoll) | |
792 | return 0; | |
793 | ||
794 | ev.events = EPOLLIN; | |
795 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
796 | ||
797 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
798 | if (r < 0) { | |
799 | close_nointr_nofail(e->signal_fd); | |
800 | e->signal_fd = -1; | |
801 | ||
802 | return -errno; | |
803 | } | |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
f7262a9f | 808 | _public_ int sd_event_add_signal( |
305f78bf LP |
809 | sd_event *e, |
810 | int sig, | |
718db961 | 811 | sd_event_signal_handler_t callback, |
305f78bf LP |
812 | void *userdata, |
813 | sd_event_source **ret) { | |
814 | ||
fd38203a LP |
815 | sd_event_source *s; |
816 | int r; | |
817 | ||
305f78bf LP |
818 | assert_return(e, -EINVAL); |
819 | assert_return(sig > 0, -EINVAL); | |
820 | assert_return(sig < _NSIG, -EINVAL); | |
821 | assert_return(callback, -EINVAL); | |
822 | assert_return(ret, -EINVAL); | |
da7e457c | 823 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 824 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
825 | |
826 | if (!e->signal_sources) { | |
827 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
828 | if (!e->signal_sources) | |
829 | return -ENOMEM; | |
830 | } else if (e->signal_sources[sig]) | |
831 | return -EBUSY; | |
832 | ||
833 | s = source_new(e, SOURCE_SIGNAL); | |
834 | if (!s) | |
835 | return -ENOMEM; | |
836 | ||
837 | s->signal.sig = sig; | |
838 | s->signal.callback = callback; | |
839 | s->userdata = userdata; | |
baf76283 | 840 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
841 | |
842 | e->signal_sources[sig] = s; | |
843 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
844 | ||
baf76283 | 845 | if (sig != SIGCHLD || e->n_enabled_child_sources == 0) { |
fd38203a LP |
846 | r = event_update_signal_fd(e); |
847 | if (r < 0) { | |
848 | source_free(s); | |
849 | return r; | |
850 | } | |
851 | } | |
852 | ||
853 | *ret = s; | |
854 | return 0; | |
855 | } | |
856 | ||
f7262a9f | 857 | _public_ int sd_event_add_child( |
305f78bf LP |
858 | sd_event *e, |
859 | pid_t pid, | |
860 | int options, | |
718db961 | 861 | sd_event_child_handler_t callback, |
305f78bf LP |
862 | void *userdata, |
863 | sd_event_source **ret) { | |
864 | ||
fd38203a LP |
865 | sd_event_source *s; |
866 | int r; | |
867 | ||
305f78bf LP |
868 | assert_return(e, -EINVAL); |
869 | assert_return(pid > 1, -EINVAL); | |
870 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
871 | assert_return(options != 0, -EINVAL); | |
872 | assert_return(callback, -EINVAL); | |
873 | assert_return(ret, -EINVAL); | |
da7e457c | 874 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 875 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
876 | |
877 | r = hashmap_ensure_allocated(&e->child_sources, trivial_hash_func, trivial_compare_func); | |
878 | if (r < 0) | |
879 | return r; | |
880 | ||
881 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
882 | return -EBUSY; | |
883 | ||
884 | s = source_new(e, SOURCE_CHILD); | |
885 | if (!s) | |
886 | return -ENOMEM; | |
887 | ||
888 | s->child.pid = pid; | |
889 | s->child.options = options; | |
890 | s->child.callback = callback; | |
891 | s->userdata = userdata; | |
baf76283 | 892 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
893 | |
894 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
895 | if (r < 0) { | |
896 | source_free(s); | |
897 | return r; | |
898 | } | |
899 | ||
baf76283 | 900 | e->n_enabled_child_sources ++; |
fd38203a LP |
901 | |
902 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
903 | ||
904 | if (!e->signal_sources || !e->signal_sources[SIGCHLD]) { | |
905 | r = event_update_signal_fd(e); | |
906 | if (r < 0) { | |
907 | source_free(s); | |
908 | return -errno; | |
909 | } | |
910 | } | |
911 | ||
c2ba3ad6 LP |
912 | e->need_process_child = true; |
913 | ||
fd38203a LP |
914 | *ret = s; |
915 | return 0; | |
916 | } | |
917 | ||
f7262a9f | 918 | _public_ int sd_event_add_defer( |
305f78bf | 919 | sd_event *e, |
718db961 | 920 | sd_event_handler_t callback, |
305f78bf LP |
921 | void *userdata, |
922 | sd_event_source **ret) { | |
923 | ||
fd38203a LP |
924 | sd_event_source *s; |
925 | int r; | |
926 | ||
305f78bf LP |
927 | assert_return(e, -EINVAL); |
928 | assert_return(callback, -EINVAL); | |
929 | assert_return(ret, -EINVAL); | |
da7e457c | 930 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 931 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
932 | |
933 | s = source_new(e, SOURCE_DEFER); | |
934 | if (!s) | |
935 | return -ENOMEM; | |
936 | ||
937 | s->defer.callback = callback; | |
938 | s->userdata = userdata; | |
baf76283 | 939 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
940 | |
941 | r = source_set_pending(s, true); | |
942 | if (r < 0) { | |
943 | source_free(s); | |
944 | return r; | |
945 | } | |
946 | ||
947 | *ret = s; | |
948 | return 0; | |
949 | } | |
950 | ||
6203e07a | 951 | _public_ int sd_event_add_exit( |
305f78bf | 952 | sd_event *e, |
718db961 | 953 | sd_event_handler_t callback, |
305f78bf LP |
954 | void *userdata, |
955 | sd_event_source **ret) { | |
956 | ||
da7e457c LP |
957 | sd_event_source *s; |
958 | int r; | |
959 | ||
960 | assert_return(e, -EINVAL); | |
961 | assert_return(callback, -EINVAL); | |
305f78bf | 962 | assert_return(ret, -EINVAL); |
da7e457c LP |
963 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
964 | assert_return(!event_pid_changed(e), -ECHILD); | |
965 | ||
6203e07a LP |
966 | if (!e->exit) { |
967 | e->exit = prioq_new(exit_prioq_compare); | |
968 | if (!e->exit) | |
da7e457c LP |
969 | return -ENOMEM; |
970 | } | |
971 | ||
6203e07a | 972 | s = source_new(e, SOURCE_EXIT); |
fd38203a | 973 | if (!s) |
da7e457c | 974 | return -ENOMEM; |
fd38203a | 975 | |
6203e07a | 976 | s->exit.callback = callback; |
da7e457c | 977 | s->userdata = userdata; |
6203e07a | 978 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 979 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 980 | |
6203e07a | 981 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
982 | if (r < 0) { |
983 | source_free(s); | |
984 | return r; | |
985 | } | |
986 | ||
987 | *ret = s; | |
988 | return 0; | |
989 | } | |
990 | ||
f7262a9f | 991 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
da7e457c LP |
992 | assert_return(s, NULL); |
993 | ||
994 | assert(s->n_ref >= 1); | |
995 | s->n_ref++; | |
fd38203a LP |
996 | |
997 | return s; | |
998 | } | |
999 | ||
f7262a9f | 1000 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1001 | |
1002 | if (!s) | |
1003 | return NULL; | |
fd38203a | 1004 | |
da7e457c LP |
1005 | assert(s->n_ref >= 1); |
1006 | s->n_ref--; | |
1007 | ||
12179984 LP |
1008 | if (s->n_ref <= 0) { |
1009 | /* Here's a special hack: when we are called from a | |
1010 | * dispatch handler we won't free the event source | |
1011 | * immediately, but we will detach the fd from the | |
1012 | * epoll. This way it is safe for the caller to unref | |
1013 | * the event source and immediately close the fd, but | |
1014 | * we still retain a valid event source object after | |
1015 | * the callback. */ | |
1016 | ||
1017 | if (s->dispatching) { | |
1018 | if (s->type == SOURCE_IO) | |
1019 | source_io_unregister(s); | |
1020 | } else | |
1021 | source_free(s); | |
1022 | } | |
fd38203a LP |
1023 | |
1024 | return NULL; | |
1025 | } | |
1026 | ||
adcc4ca3 | 1027 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1028 | assert_return(s, NULL); |
eaa3cbef LP |
1029 | |
1030 | return s->event; | |
1031 | } | |
1032 | ||
f7262a9f | 1033 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1034 | assert_return(s, -EINVAL); |
6203e07a | 1035 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1036 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1037 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1038 | |
1039 | return s->pending; | |
1040 | } | |
1041 | ||
f7262a9f | 1042 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1043 | assert_return(s, -EINVAL); |
1044 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1045 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1046 | |
1047 | return s->io.fd; | |
1048 | } | |
1049 | ||
30caf8f3 LP |
1050 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1051 | int r; | |
1052 | ||
1053 | assert_return(s, -EINVAL); | |
1054 | assert_return(fd >= 0, -EINVAL); | |
1055 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1056 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1057 | ||
1058 | if (s->io.fd == fd) | |
1059 | return 0; | |
1060 | ||
1061 | if (s->enabled == SD_EVENT_OFF) { | |
1062 | s->io.fd = fd; | |
1063 | s->io.registered = false; | |
1064 | } else { | |
1065 | int saved_fd; | |
1066 | ||
1067 | saved_fd = s->io.fd; | |
1068 | assert(s->io.registered); | |
1069 | ||
1070 | s->io.fd = fd; | |
1071 | s->io.registered = false; | |
1072 | ||
1073 | r = source_io_register(s, s->enabled, s->io.events); | |
1074 | if (r < 0) { | |
1075 | s->io.fd = saved_fd; | |
1076 | s->io.registered = true; | |
1077 | return r; | |
1078 | } | |
1079 | ||
1080 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1081 | } | |
1082 | ||
1083 | return 0; | |
1084 | } | |
1085 | ||
f7262a9f | 1086 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1087 | assert_return(s, -EINVAL); |
1088 | assert_return(events, -EINVAL); | |
1089 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1090 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1091 | |
1092 | *events = s->io.events; | |
1093 | return 0; | |
1094 | } | |
1095 | ||
f7262a9f | 1096 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1097 | int r; |
1098 | ||
305f78bf LP |
1099 | assert_return(s, -EINVAL); |
1100 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1101 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1102 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1103 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1104 | |
1105 | if (s->io.events == events) | |
1106 | return 0; | |
1107 | ||
baf76283 | 1108 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1109 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1110 | if (r < 0) |
1111 | return r; | |
1112 | } | |
1113 | ||
1114 | s->io.events = events; | |
503f39c3 | 1115 | source_set_pending(s, false); |
fd38203a LP |
1116 | |
1117 | return 0; | |
1118 | } | |
1119 | ||
f7262a9f | 1120 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1121 | assert_return(s, -EINVAL); |
1122 | assert_return(revents, -EINVAL); | |
1123 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1124 | assert_return(s->pending, -ENODATA); | |
1125 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1126 | |
1127 | *revents = s->io.revents; | |
1128 | return 0; | |
1129 | } | |
1130 | ||
f7262a9f | 1131 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1132 | assert_return(s, -EINVAL); |
1133 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1134 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1135 | |
1136 | return s->signal.sig; | |
1137 | } | |
1138 | ||
f7262a9f | 1139 | _public_ int sd_event_source_get_priority(sd_event_source *s, int *priority) { |
305f78bf LP |
1140 | assert_return(s, -EINVAL); |
1141 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1142 | |
1143 | return s->priority; | |
1144 | } | |
1145 | ||
f7262a9f | 1146 | _public_ int sd_event_source_set_priority(sd_event_source *s, int priority) { |
305f78bf | 1147 | assert_return(s, -EINVAL); |
da7e457c | 1148 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1149 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1150 | |
1151 | if (s->priority == priority) | |
1152 | return 0; | |
1153 | ||
1154 | s->priority = priority; | |
1155 | ||
1156 | if (s->pending) | |
c2ba3ad6 | 1157 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1158 | |
1159 | if (s->prepare) | |
c2ba3ad6 | 1160 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1161 | |
6203e07a LP |
1162 | if (s->type == SOURCE_EXIT) |
1163 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1164 | |
fd38203a LP |
1165 | return 0; |
1166 | } | |
1167 | ||
f7262a9f | 1168 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1169 | assert_return(s, -EINVAL); |
1170 | assert_return(m, -EINVAL); | |
1171 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1172 | |
baf76283 | 1173 | *m = s->enabled; |
fd38203a LP |
1174 | return 0; |
1175 | } | |
1176 | ||
f7262a9f | 1177 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1178 | int r; |
1179 | ||
305f78bf LP |
1180 | assert_return(s, -EINVAL); |
1181 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
da7e457c | 1182 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1183 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1184 | |
baf76283 | 1185 | if (s->enabled == m) |
fd38203a LP |
1186 | return 0; |
1187 | ||
baf76283 | 1188 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1189 | |
1190 | switch (s->type) { | |
1191 | ||
1192 | case SOURCE_IO: | |
1193 | r = source_io_unregister(s); | |
1194 | if (r < 0) | |
1195 | return r; | |
1196 | ||
baf76283 | 1197 | s->enabled = m; |
fd38203a LP |
1198 | break; |
1199 | ||
1200 | case SOURCE_MONOTONIC: | |
baf76283 | 1201 | s->enabled = m; |
c2ba3ad6 LP |
1202 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); |
1203 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
1204 | break; |
1205 | ||
1206 | case SOURCE_REALTIME: | |
baf76283 | 1207 | s->enabled = m; |
c2ba3ad6 LP |
1208 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); |
1209 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
1210 | break; |
1211 | ||
1212 | case SOURCE_SIGNAL: | |
baf76283 LP |
1213 | s->enabled = m; |
1214 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { | |
fd38203a LP |
1215 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
1216 | event_update_signal_fd(s->event); | |
1217 | } | |
1218 | ||
1219 | break; | |
1220 | ||
1221 | case SOURCE_CHILD: | |
baf76283 | 1222 | s->enabled = m; |
fd38203a | 1223 | |
baf76283 LP |
1224 | assert(s->event->n_enabled_child_sources > 0); |
1225 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
1226 | |
1227 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1228 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
1229 | event_update_signal_fd(s->event); | |
1230 | } | |
1231 | ||
1232 | break; | |
1233 | ||
6203e07a | 1234 | case SOURCE_EXIT: |
305f78bf | 1235 | s->enabled = m; |
6203e07a | 1236 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1237 | break; |
1238 | ||
1239 | case SOURCE_DEFER: | |
baf76283 | 1240 | s->enabled = m; |
fd38203a | 1241 | break; |
9d3e3aa5 LP |
1242 | |
1243 | case SOURCE_WATCHDOG: | |
1244 | assert_not_reached("Wut? I shouldn't exist."); | |
fd38203a LP |
1245 | } |
1246 | ||
1247 | } else { | |
1248 | switch (s->type) { | |
1249 | ||
1250 | case SOURCE_IO: | |
1251 | r = source_io_register(s, m, s->io.events); | |
1252 | if (r < 0) | |
1253 | return r; | |
1254 | ||
baf76283 | 1255 | s->enabled = m; |
fd38203a LP |
1256 | break; |
1257 | ||
1258 | case SOURCE_MONOTONIC: | |
baf76283 | 1259 | s->enabled = m; |
c2ba3ad6 LP |
1260 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); |
1261 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
1262 | break; |
1263 | ||
1264 | case SOURCE_REALTIME: | |
baf76283 | 1265 | s->enabled = m; |
c2ba3ad6 LP |
1266 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); |
1267 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
1268 | break; |
1269 | ||
1270 | case SOURCE_SIGNAL: | |
baf76283 | 1271 | s->enabled = m; |
fd38203a | 1272 | |
baf76283 | 1273 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { |
fd38203a LP |
1274 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
1275 | event_update_signal_fd(s->event); | |
1276 | } | |
1277 | break; | |
1278 | ||
1279 | case SOURCE_CHILD: | |
baf76283 | 1280 | s->enabled = m; |
fd38203a | 1281 | |
baf76283 LP |
1282 | if (s->enabled == SD_EVENT_OFF) { |
1283 | s->event->n_enabled_child_sources++; | |
fd38203a LP |
1284 | |
1285 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1286 | assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0); | |
1287 | event_update_signal_fd(s->event); | |
1288 | } | |
1289 | } | |
1290 | break; | |
1291 | ||
6203e07a | 1292 | case SOURCE_EXIT: |
305f78bf | 1293 | s->enabled = m; |
6203e07a | 1294 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1295 | break; |
1296 | ||
1297 | case SOURCE_DEFER: | |
baf76283 | 1298 | s->enabled = m; |
fd38203a | 1299 | break; |
9d3e3aa5 LP |
1300 | |
1301 | case SOURCE_WATCHDOG: | |
1302 | assert_not_reached("Wut? I shouldn't exist."); | |
fd38203a LP |
1303 | } |
1304 | } | |
1305 | ||
1306 | if (s->pending) | |
1307 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1308 | ||
1309 | if (s->prepare) | |
1310 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1311 | ||
1312 | return 0; | |
1313 | } | |
1314 | ||
f7262a9f | 1315 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1316 | assert_return(s, -EINVAL); |
1317 | assert_return(usec, -EINVAL); | |
1318 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1319 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1320 | |
1321 | *usec = s->time.next; | |
1322 | return 0; | |
1323 | } | |
1324 | ||
f7262a9f | 1325 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
305f78bf LP |
1326 | assert_return(s, -EINVAL); |
1327 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1328 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1329 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1330 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1331 | |
fd38203a | 1332 | s->time.next = usec; |
2576a19e | 1333 | |
0cc1125a | 1334 | source_set_pending(s, false); |
fd38203a | 1335 | |
c2ba3ad6 LP |
1336 | if (s->type == SOURCE_REALTIME) { |
1337 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); | |
1338 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1339 | } else { | |
1340 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); | |
1341 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1342 | } | |
fd38203a LP |
1343 | |
1344 | return 0; | |
1345 | } | |
1346 | ||
f7262a9f | 1347 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1348 | assert_return(s, -EINVAL); |
1349 | assert_return(usec, -EINVAL); | |
1350 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1351 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1352 | ||
1353 | *usec = s->time.accuracy; | |
1354 | return 0; | |
1355 | } | |
1356 | ||
f7262a9f | 1357 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
305f78bf LP |
1358 | assert_return(s, -EINVAL); |
1359 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1360 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1361 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1362 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1363 | |
1364 | if (usec == 0) | |
1365 | usec = DEFAULT_ACCURACY_USEC; | |
1366 | ||
eaa3cbef LP |
1367 | s->time.accuracy = usec; |
1368 | ||
2576a19e LP |
1369 | source_set_pending(s, false); |
1370 | ||
eaa3cbef LP |
1371 | if (s->type == SOURCE_REALTIME) |
1372 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1373 | else | |
1374 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1375 | ||
1376 | return 0; | |
1377 | } | |
1378 | ||
f7262a9f | 1379 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1380 | assert_return(s, -EINVAL); |
1381 | assert_return(pid, -EINVAL); | |
1382 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1383 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1384 | ||
1385 | *pid = s->child.pid; | |
1386 | return 0; | |
1387 | } | |
1388 | ||
718db961 | 1389 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1390 | int r; |
1391 | ||
da7e457c | 1392 | assert_return(s, -EINVAL); |
6203e07a | 1393 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1394 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1395 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1396 | |
1397 | if (s->prepare == callback) | |
1398 | return 0; | |
1399 | ||
1400 | if (callback && s->prepare) { | |
1401 | s->prepare = callback; | |
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1406 | if (r < 0) | |
1407 | return r; | |
1408 | ||
1409 | s->prepare = callback; | |
1410 | ||
1411 | if (callback) { | |
1412 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1413 | if (r < 0) | |
1414 | return r; | |
1415 | } else | |
1416 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1417 | ||
1418 | return 0; | |
1419 | } | |
1420 | ||
f7262a9f | 1421 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1422 | assert_return(s, NULL); |
fd38203a LP |
1423 | |
1424 | return s->userdata; | |
1425 | } | |
1426 | ||
8f726607 LP |
1427 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1428 | void *ret; | |
1429 | ||
1430 | assert_return(s, NULL); | |
1431 | ||
1432 | ret = s->userdata; | |
1433 | s->userdata = userdata; | |
1434 | ||
1435 | return ret; | |
1436 | } | |
1437 | ||
c2ba3ad6 LP |
1438 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1439 | usec_t c; | |
1440 | assert(e); | |
1441 | assert(a <= b); | |
1442 | ||
1443 | if (a <= 0) | |
1444 | return 0; | |
1445 | ||
1446 | if (b <= a + 1) | |
1447 | return a; | |
1448 | ||
1449 | /* | |
1450 | Find a good time to wake up again between times a and b. We | |
1451 | have two goals here: | |
1452 | ||
1453 | a) We want to wake up as seldom as possible, hence prefer | |
1454 | later times over earlier times. | |
1455 | ||
1456 | b) But if we have to wake up, then let's make sure to | |
1457 | dispatch as much as possible on the entire system. | |
1458 | ||
1459 | We implement this by waking up everywhere at the same time | |
850516e0 | 1460 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1461 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1462 | then we try to find the same spot in every 10s, then 1s and |
1463 | then 250ms step. Otherwise, we pick the last possible time | |
1464 | to wake up. | |
c2ba3ad6 LP |
1465 | */ |
1466 | ||
850516e0 LP |
1467 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1468 | if (c >= b) { | |
1469 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1470 | return b; | |
1471 | ||
1472 | c -= USEC_PER_MINUTE; | |
1473 | } | |
1474 | ||
ba276c81 LP |
1475 | if (c >= a) |
1476 | return c; | |
1477 | ||
1478 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1479 | if (c >= b) { | |
1480 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1481 | return b; | |
1482 | ||
1483 | c -= USEC_PER_SEC*10; | |
1484 | } | |
1485 | ||
850516e0 LP |
1486 | if (c >= a) |
1487 | return c; | |
1488 | ||
1489 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1490 | if (c >= b) { |
1491 | if (_unlikely_(c < USEC_PER_SEC)) | |
1492 | return b; | |
1493 | ||
1494 | c -= USEC_PER_SEC; | |
1495 | } | |
1496 | ||
1497 | if (c >= a) | |
1498 | return c; | |
1499 | ||
1500 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1501 | if (c >= b) { | |
1502 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1503 | return b; | |
1504 | ||
1505 | c -= USEC_PER_MSEC*250; | |
1506 | } | |
1507 | ||
1508 | if (c >= a) | |
1509 | return c; | |
1510 | ||
1511 | return b; | |
1512 | } | |
1513 | ||
fd38203a LP |
1514 | static int event_arm_timer( |
1515 | sd_event *e, | |
1516 | int timer_fd, | |
c2ba3ad6 LP |
1517 | Prioq *earliest, |
1518 | Prioq *latest, | |
fd38203a LP |
1519 | usec_t *next) { |
1520 | ||
1521 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1522 | sd_event_source *a, *b; |
1523 | usec_t t; | |
fd38203a LP |
1524 | int r; |
1525 | ||
cde93897 LP |
1526 | assert(e); |
1527 | assert(next); | |
fd38203a | 1528 | |
c2ba3ad6 | 1529 | a = prioq_peek(earliest); |
72aedc1e LP |
1530 | if (!a || a->enabled == SD_EVENT_OFF) { |
1531 | ||
c57b5ca3 LP |
1532 | if (timer_fd < 0) |
1533 | return 0; | |
1534 | ||
72aedc1e LP |
1535 | if (*next == (usec_t) -1) |
1536 | return 0; | |
1537 | ||
1538 | /* disarm */ | |
1539 | r = timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1540 | if (r < 0) | |
1541 | return r; | |
1542 | ||
1543 | *next = (usec_t) -1; | |
1544 | ||
fd38203a | 1545 | return 0; |
72aedc1e | 1546 | } |
fd38203a | 1547 | |
c2ba3ad6 | 1548 | b = prioq_peek(latest); |
baf76283 | 1549 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1550 | |
1551 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
1552 | if (*next == t) | |
fd38203a LP |
1553 | return 0; |
1554 | ||
1555 | assert_se(timer_fd >= 0); | |
1556 | ||
c2ba3ad6 | 1557 | if (t == 0) { |
fd38203a LP |
1558 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1559 | its.it_value.tv_sec = 0; | |
1560 | its.it_value.tv_nsec = 1; | |
1561 | } else | |
c2ba3ad6 | 1562 | timespec_store(&its.it_value, t); |
fd38203a LP |
1563 | |
1564 | r = timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1565 | if (r < 0) | |
cde93897 | 1566 | return -errno; |
fd38203a | 1567 | |
c2ba3ad6 | 1568 | *next = t; |
fd38203a LP |
1569 | return 0; |
1570 | } | |
1571 | ||
1572 | static int process_io(sd_event *e, sd_event_source *s, uint32_t events) { | |
1573 | assert(e); | |
1574 | assert(s); | |
1575 | assert(s->type == SOURCE_IO); | |
1576 | ||
1577 | s->io.revents = events; | |
1578 | ||
fd38203a LP |
1579 | return source_set_pending(s, true); |
1580 | } | |
1581 | ||
72aedc1e | 1582 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
1583 | uint64_t x; |
1584 | ssize_t ss; | |
1585 | ||
1586 | assert(e); | |
da7e457c | 1587 | assert(fd >= 0); |
72aedc1e | 1588 | |
305f78bf | 1589 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1590 | |
1591 | ss = read(fd, &x, sizeof(x)); | |
1592 | if (ss < 0) { | |
1593 | if (errno == EAGAIN || errno == EINTR) | |
1594 | return 0; | |
1595 | ||
1596 | return -errno; | |
1597 | } | |
1598 | ||
1599 | if (ss != sizeof(x)) | |
1600 | return -EIO; | |
1601 | ||
cde93897 LP |
1602 | if (next) |
1603 | *next = (usec_t) -1; | |
72aedc1e | 1604 | |
fd38203a LP |
1605 | return 0; |
1606 | } | |
1607 | ||
305f78bf LP |
1608 | static int process_timer( |
1609 | sd_event *e, | |
1610 | usec_t n, | |
1611 | Prioq *earliest, | |
1612 | Prioq *latest) { | |
1613 | ||
fd38203a LP |
1614 | sd_event_source *s; |
1615 | int r; | |
1616 | ||
1617 | assert(e); | |
1618 | ||
1619 | for (;;) { | |
c2ba3ad6 | 1620 | s = prioq_peek(earliest); |
fd38203a LP |
1621 | if (!s || |
1622 | s->time.next > n || | |
baf76283 | 1623 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1624 | s->pending) |
1625 | break; | |
1626 | ||
1627 | r = source_set_pending(s, true); | |
1628 | if (r < 0) | |
1629 | return r; | |
1630 | ||
c2ba3ad6 LP |
1631 | prioq_reshuffle(earliest, s, &s->time.earliest_index); |
1632 | prioq_reshuffle(latest, s, &s->time.latest_index); | |
fd38203a LP |
1633 | } |
1634 | ||
1635 | return 0; | |
1636 | } | |
1637 | ||
1638 | static int process_child(sd_event *e) { | |
1639 | sd_event_source *s; | |
1640 | Iterator i; | |
1641 | int r; | |
1642 | ||
1643 | assert(e); | |
1644 | ||
c2ba3ad6 LP |
1645 | e->need_process_child = false; |
1646 | ||
fd38203a LP |
1647 | /* |
1648 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1649 | + WNOHANG for each PID we wait for, instead of using | |
1650 | P_ALL. This is because we only want to get child | |
1651 | information of very specific child processes, and not all | |
1652 | of them. We might not have processed the SIGCHLD even of a | |
1653 | previous invocation and we don't want to maintain a | |
1654 | unbounded *per-child* event queue, hence we really don't | |
1655 | want anything flushed out of the kernel's queue that we | |
1656 | don't care about. Since this is O(n) this means that if you | |
1657 | have a lot of processes you probably want to handle SIGCHLD | |
1658 | yourself. | |
08cd1552 LP |
1659 | |
1660 | We do not reap the children here (by using WNOWAIT), this | |
1661 | is only done after the event source is dispatched so that | |
1662 | the callback still sees the process as a zombie. | |
fd38203a LP |
1663 | */ |
1664 | ||
1665 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1666 | assert(s->type == SOURCE_CHILD); | |
1667 | ||
1668 | if (s->pending) | |
1669 | continue; | |
1670 | ||
baf76283 | 1671 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1672 | continue; |
1673 | ||
1674 | zero(s->child.siginfo); | |
08cd1552 LP |
1675 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
1676 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
1677 | if (r < 0) |
1678 | return -errno; | |
1679 | ||
1680 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
1681 | bool zombie = |
1682 | s->child.siginfo.si_code == CLD_EXITED || | |
1683 | s->child.siginfo.si_code == CLD_KILLED || | |
1684 | s->child.siginfo.si_code == CLD_DUMPED; | |
1685 | ||
1686 | if (!zombie && (s->child.options & WEXITED)) { | |
1687 | /* If the child isn't dead then let's | |
1688 | * immediately remove the state change | |
1689 | * from the queue, since there's no | |
1690 | * benefit in leaving it queued */ | |
1691 | ||
1692 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
1693 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
1694 | } | |
1695 | ||
fd38203a LP |
1696 | r = source_set_pending(s, true); |
1697 | if (r < 0) | |
1698 | return r; | |
1699 | } | |
1700 | } | |
1701 | ||
fd38203a LP |
1702 | return 0; |
1703 | } | |
1704 | ||
1705 | static int process_signal(sd_event *e, uint32_t events) { | |
fd38203a | 1706 | bool read_one = false; |
fd38203a LP |
1707 | int r; |
1708 | ||
da7e457c | 1709 | assert(e); |
0eb2e0e3 ZJS |
1710 | assert(e->signal_sources); |
1711 | ||
305f78bf | 1712 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1713 | |
1714 | for (;;) { | |
0eb2e0e3 ZJS |
1715 | struct signalfd_siginfo si; |
1716 | ssize_t ss; | |
fd38203a LP |
1717 | sd_event_source *s; |
1718 | ||
1719 | ss = read(e->signal_fd, &si, sizeof(si)); | |
1720 | if (ss < 0) { | |
1721 | if (errno == EAGAIN || errno == EINTR) | |
1722 | return read_one; | |
1723 | ||
1724 | return -errno; | |
1725 | } | |
1726 | ||
1727 | if (ss != sizeof(si)) | |
1728 | return -EIO; | |
1729 | ||
1730 | read_one = true; | |
1731 | ||
0eb2e0e3 | 1732 | s = e->signal_sources[si.ssi_signo]; |
fd38203a LP |
1733 | if (si.ssi_signo == SIGCHLD) { |
1734 | r = process_child(e); | |
1735 | if (r < 0) | |
1736 | return r; | |
0eb2e0e3 | 1737 | if (r > 0 || !s) |
fd38203a | 1738 | continue; |
0eb2e0e3 | 1739 | } else |
fd38203a LP |
1740 | if (!s) |
1741 | return -EIO; | |
fd38203a LP |
1742 | |
1743 | s->signal.siginfo = si; | |
1744 | r = source_set_pending(s, true); | |
1745 | if (r < 0) | |
1746 | return r; | |
1747 | } | |
1748 | ||
fd38203a LP |
1749 | return 0; |
1750 | } | |
1751 | ||
1752 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 1753 | int r = 0; |
fd38203a LP |
1754 | |
1755 | assert(s); | |
6203e07a | 1756 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 1757 | |
6203e07a | 1758 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
1759 | r = source_set_pending(s, false); |
1760 | if (r < 0) | |
1761 | return r; | |
1762 | } | |
fd38203a | 1763 | |
baf76283 LP |
1764 | if (s->enabled == SD_EVENT_ONESHOT) { |
1765 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
1766 | if (r < 0) |
1767 | return r; | |
1768 | } | |
1769 | ||
12179984 | 1770 | s->dispatching = true; |
b7484e2a | 1771 | |
fd38203a LP |
1772 | switch (s->type) { |
1773 | ||
1774 | case SOURCE_IO: | |
1775 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
1776 | break; | |
1777 | ||
1778 | case SOURCE_MONOTONIC: | |
1779 | r = s->time.callback(s, s->time.next, s->userdata); | |
1780 | break; | |
1781 | ||
1782 | case SOURCE_REALTIME: | |
1783 | r = s->time.callback(s, s->time.next, s->userdata); | |
1784 | break; | |
1785 | ||
1786 | case SOURCE_SIGNAL: | |
1787 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
1788 | break; | |
1789 | ||
08cd1552 LP |
1790 | case SOURCE_CHILD: { |
1791 | bool zombie; | |
1792 | ||
1793 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
1794 | s->child.siginfo.si_code == CLD_KILLED || | |
1795 | s->child.siginfo.si_code == CLD_DUMPED; | |
1796 | ||
fd38203a | 1797 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
1798 | |
1799 | /* Now, reap the PID for good. */ | |
1800 | if (zombie) | |
1801 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
1802 | ||
fd38203a | 1803 | break; |
08cd1552 | 1804 | } |
fd38203a LP |
1805 | |
1806 | case SOURCE_DEFER: | |
1807 | r = s->defer.callback(s, s->userdata); | |
1808 | break; | |
da7e457c | 1809 | |
6203e07a LP |
1810 | case SOURCE_EXIT: |
1811 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 1812 | break; |
9d3e3aa5 LP |
1813 | |
1814 | case SOURCE_WATCHDOG: | |
1815 | assert_not_reached("Wut? I shouldn't exist."); | |
fd38203a LP |
1816 | } |
1817 | ||
12179984 LP |
1818 | s->dispatching = false; |
1819 | ||
1820 | if (r < 0) | |
6203e07a | 1821 | log_debug("Event source %p returned error, disabling: %s", s, strerror(-r)); |
12179984 LP |
1822 | |
1823 | if (s->n_ref == 0) | |
1824 | source_free(s); | |
1825 | else if (r < 0) | |
6203e07a | 1826 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 1827 | |
6203e07a | 1828 | return 1; |
fd38203a LP |
1829 | } |
1830 | ||
1831 | static int event_prepare(sd_event *e) { | |
1832 | int r; | |
1833 | ||
1834 | assert(e); | |
1835 | ||
1836 | for (;;) { | |
1837 | sd_event_source *s; | |
1838 | ||
1839 | s = prioq_peek(e->prepare); | |
baf76283 | 1840 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1841 | break; |
1842 | ||
1843 | s->prepare_iteration = e->iteration; | |
1844 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
1845 | if (r < 0) | |
1846 | return r; | |
1847 | ||
1848 | assert(s->prepare); | |
12179984 LP |
1849 | |
1850 | s->dispatching = true; | |
fd38203a | 1851 | r = s->prepare(s, s->userdata); |
12179984 LP |
1852 | s->dispatching = false; |
1853 | ||
fd38203a | 1854 | if (r < 0) |
12179984 | 1855 | log_debug("Prepare callback of event source %p returned error, disabling: %s", s, strerror(-r)); |
fd38203a | 1856 | |
12179984 LP |
1857 | if (s->n_ref == 0) |
1858 | source_free(s); | |
1859 | else if (r < 0) | |
1860 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
1861 | } |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
6203e07a | 1866 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
1867 | sd_event_source *p; |
1868 | int r; | |
1869 | ||
1870 | assert(e); | |
1871 | ||
6203e07a | 1872 | p = prioq_peek(e->exit); |
baf76283 | 1873 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
1874 | e->state = SD_EVENT_FINISHED; |
1875 | return 0; | |
1876 | } | |
1877 | ||
1878 | sd_event_ref(e); | |
1879 | e->iteration++; | |
6203e07a | 1880 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
1881 | |
1882 | r = source_dispatch(p); | |
1883 | ||
1884 | e->state = SD_EVENT_PASSIVE; | |
1885 | sd_event_unref(e); | |
1886 | ||
1887 | return r; | |
1888 | } | |
1889 | ||
c2ba3ad6 LP |
1890 | static sd_event_source* event_next_pending(sd_event *e) { |
1891 | sd_event_source *p; | |
1892 | ||
da7e457c LP |
1893 | assert(e); |
1894 | ||
c2ba3ad6 LP |
1895 | p = prioq_peek(e->pending); |
1896 | if (!p) | |
1897 | return NULL; | |
1898 | ||
baf76283 | 1899 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
1900 | return NULL; |
1901 | ||
1902 | return p; | |
1903 | } | |
1904 | ||
cde93897 LP |
1905 | static int arm_watchdog(sd_event *e) { |
1906 | struct itimerspec its = {}; | |
1907 | usec_t t; | |
1908 | int r; | |
1909 | ||
1910 | assert(e); | |
1911 | assert(e->watchdog_fd >= 0); | |
1912 | ||
1913 | t = sleep_between(e, | |
1914 | e->watchdog_last + (e->watchdog_period / 2), | |
1915 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
1916 | ||
1917 | timespec_store(&its.it_value, t); | |
1918 | ||
1919 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1920 | if (r < 0) | |
1921 | return -errno; | |
1922 | ||
1923 | return 0; | |
1924 | } | |
1925 | ||
1926 | static int process_watchdog(sd_event *e) { | |
1927 | assert(e); | |
1928 | ||
1929 | if (!e->watchdog) | |
1930 | return 0; | |
1931 | ||
1932 | /* Don't notify watchdog too often */ | |
1933 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
1934 | return 0; | |
1935 | ||
1936 | sd_notify(false, "WATCHDOG=1"); | |
1937 | e->watchdog_last = e->timestamp.monotonic; | |
1938 | ||
1939 | return arm_watchdog(e); | |
1940 | } | |
1941 | ||
f7262a9f | 1942 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
15b38f93 LP |
1943 | struct epoll_event *ev_queue; |
1944 | unsigned ev_queue_max; | |
fd38203a | 1945 | sd_event_source *p; |
305f78bf | 1946 | int r, i, m; |
fd38203a | 1947 | |
da7e457c LP |
1948 | assert_return(e, -EINVAL); |
1949 | assert_return(!event_pid_changed(e), -ECHILD); | |
1950 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1951 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
1952 | ||
6203e07a LP |
1953 | if (e->exit_requested) |
1954 | return dispatch_exit(e); | |
fd38203a | 1955 | |
da7e457c | 1956 | sd_event_ref(e); |
fd38203a | 1957 | e->iteration++; |
da7e457c | 1958 | e->state = SD_EVENT_RUNNING; |
fd38203a LP |
1959 | |
1960 | r = event_prepare(e); | |
1961 | if (r < 0) | |
da7e457c | 1962 | goto finish; |
fd38203a | 1963 | |
1b5995b0 LP |
1964 | r = event_arm_timer(e, e->monotonic_fd, e->monotonic_earliest, e->monotonic_latest, &e->monotonic_next); |
1965 | if (r < 0) | |
1966 | goto finish; | |
fd38203a | 1967 | |
1b5995b0 LP |
1968 | r = event_arm_timer(e, e->realtime_fd, e->realtime_earliest, e->realtime_latest, &e->realtime_next); |
1969 | if (r < 0) | |
1970 | goto finish; | |
fd38203a | 1971 | |
1b5995b0 LP |
1972 | if (event_next_pending(e) || e->need_process_child) |
1973 | timeout = 0; | |
15b38f93 LP |
1974 | ev_queue_max = CLAMP(e->n_sources, 1U, EPOLL_QUEUE_MAX); |
1975 | ev_queue = newa(struct epoll_event, ev_queue_max); | |
fd38203a | 1976 | |
15b38f93 | 1977 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 1978 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 1979 | if (m < 0) { |
d09d5ecd | 1980 | r = errno == EAGAIN || errno == EINTR ? 0 : -errno; |
da7e457c LP |
1981 | goto finish; |
1982 | } | |
fd38203a | 1983 | |
46e8c825 | 1984 | dual_timestamp_get(&e->timestamp); |
fd38203a LP |
1985 | |
1986 | for (i = 0; i < m; i++) { | |
1987 | ||
1988 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_MONOTONIC)) | |
72aedc1e | 1989 | r = flush_timer(e, e->monotonic_fd, ev_queue[i].events, &e->monotonic_next); |
fd38203a | 1990 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_REALTIME)) |
72aedc1e | 1991 | r = flush_timer(e, e->realtime_fd, ev_queue[i].events, &e->realtime_next); |
fd38203a LP |
1992 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) |
1993 | r = process_signal(e, ev_queue[i].events); | |
cde93897 LP |
1994 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
1995 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); | |
fd38203a LP |
1996 | else |
1997 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
1998 | ||
1999 | if (r < 0) | |
da7e457c | 2000 | goto finish; |
fd38203a LP |
2001 | } |
2002 | ||
cde93897 LP |
2003 | r = process_watchdog(e); |
2004 | if (r < 0) | |
2005 | goto finish; | |
2006 | ||
46e8c825 | 2007 | r = process_timer(e, e->timestamp.monotonic, e->monotonic_earliest, e->monotonic_latest); |
fd38203a | 2008 | if (r < 0) |
da7e457c | 2009 | goto finish; |
fd38203a | 2010 | |
46e8c825 | 2011 | r = process_timer(e, e->timestamp.realtime, e->realtime_earliest, e->realtime_latest); |
fd38203a | 2012 | if (r < 0) |
da7e457c | 2013 | goto finish; |
fd38203a | 2014 | |
c2ba3ad6 | 2015 | if (e->need_process_child) { |
fd38203a LP |
2016 | r = process_child(e); |
2017 | if (r < 0) | |
da7e457c | 2018 | goto finish; |
fd38203a LP |
2019 | } |
2020 | ||
c2ba3ad6 | 2021 | p = event_next_pending(e); |
da7e457c LP |
2022 | if (!p) { |
2023 | r = 0; | |
2024 | goto finish; | |
2025 | } | |
2026 | ||
2027 | r = source_dispatch(p); | |
fd38203a | 2028 | |
da7e457c LP |
2029 | finish: |
2030 | e->state = SD_EVENT_PASSIVE; | |
2031 | sd_event_unref(e); | |
2032 | ||
2033 | return r; | |
fd38203a LP |
2034 | } |
2035 | ||
f7262a9f | 2036 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2037 | int r; |
2038 | ||
da7e457c LP |
2039 | assert_return(e, -EINVAL); |
2040 | assert_return(!event_pid_changed(e), -ECHILD); | |
2041 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2042 | ||
2043 | sd_event_ref(e); | |
fd38203a | 2044 | |
da7e457c | 2045 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2046 | r = sd_event_run(e, (uint64_t) -1); |
2047 | if (r < 0) | |
da7e457c | 2048 | goto finish; |
fd38203a LP |
2049 | } |
2050 | ||
6203e07a | 2051 | r = e->exit_code; |
da7e457c LP |
2052 | |
2053 | finish: | |
2054 | sd_event_unref(e); | |
2055 | return r; | |
fd38203a LP |
2056 | } |
2057 | ||
f7262a9f | 2058 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2059 | assert_return(e, -EINVAL); |
2060 | assert_return(!event_pid_changed(e), -ECHILD); | |
2061 | ||
2062 | return e->state; | |
2063 | } | |
2064 | ||
6203e07a | 2065 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2066 | assert_return(e, -EINVAL); |
6203e07a | 2067 | assert_return(code, -EINVAL); |
da7e457c | 2068 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2069 | |
6203e07a LP |
2070 | if (!e->exit_requested) |
2071 | return -ENODATA; | |
2072 | ||
2073 | *code = e->exit_code; | |
2074 | return 0; | |
fd38203a LP |
2075 | } |
2076 | ||
6203e07a | 2077 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2078 | assert_return(e, -EINVAL); |
2079 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2080 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2081 | |
6203e07a LP |
2082 | e->exit_requested = true; |
2083 | e->exit_code = code; | |
2084 | ||
fd38203a LP |
2085 | return 0; |
2086 | } | |
46e8c825 | 2087 | |
f7262a9f | 2088 | _public_ int sd_event_get_now_realtime(sd_event *e, uint64_t *usec) { |
46e8c825 LP |
2089 | assert_return(e, -EINVAL); |
2090 | assert_return(usec, -EINVAL); | |
2091 | assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA); | |
2092 | assert_return(!event_pid_changed(e), -ECHILD); | |
2093 | ||
2094 | *usec = e->timestamp.realtime; | |
2095 | return 0; | |
2096 | } | |
2097 | ||
f7262a9f | 2098 | _public_ int sd_event_get_now_monotonic(sd_event *e, uint64_t *usec) { |
46e8c825 LP |
2099 | assert_return(e, -EINVAL); |
2100 | assert_return(usec, -EINVAL); | |
2101 | assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA); | |
2102 | assert_return(!event_pid_changed(e), -ECHILD); | |
2103 | ||
2104 | *usec = e->timestamp.monotonic; | |
2105 | return 0; | |
2106 | } | |
afc6adb5 LP |
2107 | |
2108 | _public_ int sd_event_default(sd_event **ret) { | |
2109 | ||
2110 | static __thread sd_event *default_event = NULL; | |
2111 | sd_event *e; | |
2112 | int r; | |
2113 | ||
2114 | if (!ret) | |
2115 | return !!default_event; | |
2116 | ||
2117 | if (default_event) { | |
2118 | *ret = sd_event_ref(default_event); | |
2119 | return 0; | |
2120 | } | |
2121 | ||
2122 | r = sd_event_new(&e); | |
2123 | if (r < 0) | |
2124 | return r; | |
2125 | ||
2126 | e->default_event_ptr = &default_event; | |
2127 | e->tid = gettid(); | |
2128 | default_event = e; | |
2129 | ||
2130 | *ret = e; | |
2131 | return 1; | |
2132 | } | |
2133 | ||
2134 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2135 | assert_return(e, -EINVAL); | |
2136 | assert_return(tid, -EINVAL); | |
76b54375 | 2137 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2138 | |
76b54375 LP |
2139 | if (e->tid != 0) { |
2140 | *tid = e->tid; | |
2141 | return 0; | |
2142 | } | |
2143 | ||
2144 | return -ENXIO; | |
afc6adb5 | 2145 | } |
cde93897 LP |
2146 | |
2147 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2148 | int r; | |
2149 | ||
2150 | assert_return(e, -EINVAL); | |
8f726607 | 2151 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2152 | |
2153 | if (e->watchdog == !!b) | |
2154 | return e->watchdog; | |
2155 | ||
2156 | if (b) { | |
2157 | struct epoll_event ev = {}; | |
2158 | const char *env; | |
2159 | ||
2160 | env = getenv("WATCHDOG_USEC"); | |
2161 | if (!env) | |
2162 | return false; | |
2163 | ||
2164 | r = safe_atou64(env, &e->watchdog_period); | |
2165 | if (r < 0) | |
2166 | return r; | |
2167 | if (e->watchdog_period <= 0) | |
2168 | return -EIO; | |
2169 | ||
2170 | /* Issue first ping immediately */ | |
2171 | sd_notify(false, "WATCHDOG=1"); | |
2172 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2173 | ||
2174 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2175 | if (e->watchdog_fd < 0) | |
2176 | return -errno; | |
2177 | ||
2178 | r = arm_watchdog(e); | |
2179 | if (r < 0) | |
2180 | goto fail; | |
2181 | ||
2182 | ev.events = EPOLLIN; | |
2183 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2184 | ||
2185 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2186 | if (r < 0) { | |
2187 | r = -errno; | |
2188 | goto fail; | |
2189 | } | |
2190 | ||
2191 | } else { | |
2192 | if (e->watchdog_fd >= 0) { | |
2193 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
2194 | close_nointr_nofail(e->watchdog_fd); | |
2195 | e->watchdog_fd = -1; | |
2196 | } | |
2197 | } | |
2198 | ||
2199 | e->watchdog = !!b; | |
2200 | return e->watchdog; | |
2201 | ||
2202 | fail: | |
2203 | close_nointr_nofail(e->watchdog_fd); | |
2204 | e->watchdog_fd = -1; | |
2205 | return r; | |
2206 | } | |
8f726607 LP |
2207 | |
2208 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2209 | assert_return(e, -EINVAL); | |
2210 | assert_return(!event_pid_changed(e), -ECHILD); | |
2211 | ||
2212 | return e->watchdog; | |
2213 | } |