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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> | |
3022d74b | 25 | #include <pthread.h> |
fd38203a | 26 | |
afc6adb5 | 27 | #include "sd-id128.h" |
cde93897 | 28 | #include "sd-daemon.h" |
fd38203a | 29 | #include "macro.h" |
fd38203a LP |
30 | #include "prioq.h" |
31 | #include "hashmap.h" | |
32 | #include "util.h" | |
33 | #include "time-util.h" | |
afc6adb5 | 34 | #include "missing.h" |
6e9feda3 | 35 | #include "set.h" |
fd38203a LP |
36 | |
37 | #include "sd-event.h" | |
38 | ||
15b38f93 | 39 | #define EPOLL_QUEUE_MAX 512U |
c2ba3ad6 | 40 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
41 | |
42 | typedef enum EventSourceType { | |
43 | SOURCE_IO, | |
44 | SOURCE_MONOTONIC, | |
45 | SOURCE_REALTIME, | |
46 | SOURCE_SIGNAL, | |
47 | SOURCE_CHILD, | |
da7e457c | 48 | SOURCE_DEFER, |
6e9feda3 | 49 | SOURCE_POST, |
6203e07a | 50 | SOURCE_EXIT, |
cde93897 | 51 | SOURCE_WATCHDOG |
fd38203a LP |
52 | } EventSourceType; |
53 | ||
54 | struct sd_event_source { | |
da7e457c | 55 | unsigned n_ref; |
fd38203a LP |
56 | |
57 | sd_event *event; | |
58 | void *userdata; | |
718db961 | 59 | sd_event_handler_t prepare; |
fd38203a LP |
60 | |
61 | EventSourceType type:4; | |
baf76283 | 62 | int enabled:3; |
fd38203a | 63 | bool pending:1; |
12179984 | 64 | bool dispatching:1; |
fd38203a | 65 | |
31927c16 | 66 | int64_t priority; |
fd38203a LP |
67 | unsigned pending_index; |
68 | unsigned prepare_index; | |
69 | unsigned pending_iteration; | |
70 | unsigned prepare_iteration; | |
71 | ||
72 | union { | |
73 | struct { | |
718db961 | 74 | sd_event_io_handler_t callback; |
fd38203a LP |
75 | int fd; |
76 | uint32_t events; | |
77 | uint32_t revents; | |
78 | bool registered:1; | |
79 | } io; | |
80 | struct { | |
718db961 | 81 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
82 | usec_t next, accuracy; |
83 | unsigned earliest_index; | |
84 | unsigned latest_index; | |
fd38203a LP |
85 | } time; |
86 | struct { | |
718db961 | 87 | sd_event_signal_handler_t callback; |
fd38203a LP |
88 | struct signalfd_siginfo siginfo; |
89 | int sig; | |
90 | } signal; | |
91 | struct { | |
718db961 | 92 | sd_event_child_handler_t callback; |
fd38203a LP |
93 | siginfo_t siginfo; |
94 | pid_t pid; | |
95 | int options; | |
96 | } child; | |
97 | struct { | |
718db961 | 98 | sd_event_handler_t callback; |
fd38203a | 99 | } defer; |
6e9feda3 LP |
100 | struct { |
101 | sd_event_handler_t callback; | |
102 | } post; | |
da7e457c | 103 | struct { |
718db961 | 104 | sd_event_handler_t callback; |
da7e457c | 105 | unsigned prioq_index; |
6203e07a | 106 | } exit; |
fd38203a LP |
107 | }; |
108 | }; | |
109 | ||
110 | struct sd_event { | |
da7e457c | 111 | unsigned n_ref; |
fd38203a LP |
112 | |
113 | int epoll_fd; | |
114 | int signal_fd; | |
115 | int realtime_fd; | |
116 | int monotonic_fd; | |
cde93897 | 117 | int watchdog_fd; |
fd38203a LP |
118 | |
119 | Prioq *pending; | |
120 | Prioq *prepare; | |
c2ba3ad6 LP |
121 | |
122 | /* For both clocks we maintain two priority queues each, one | |
123 | * ordered for the earliest times the events may be | |
124 | * dispatched, and one ordered by the latest times they must | |
125 | * have been dispatched. The range between the top entries in | |
126 | * the two prioqs is the time window we can freely schedule | |
127 | * wakeups in */ | |
128 | Prioq *monotonic_earliest; | |
129 | Prioq *monotonic_latest; | |
130 | Prioq *realtime_earliest; | |
131 | Prioq *realtime_latest; | |
fd38203a | 132 | |
da7e457c LP |
133 | usec_t realtime_next, monotonic_next; |
134 | usec_t perturb; | |
135 | ||
fd38203a LP |
136 | sigset_t sigset; |
137 | sd_event_source **signal_sources; | |
138 | ||
139 | Hashmap *child_sources; | |
baf76283 | 140 | unsigned n_enabled_child_sources; |
fd38203a | 141 | |
6e9feda3 LP |
142 | Set *post_sources; |
143 | ||
6203e07a | 144 | Prioq *exit; |
fd38203a | 145 | |
da7e457c | 146 | pid_t original_pid; |
c2ba3ad6 | 147 | |
da7e457c | 148 | unsigned iteration; |
46e8c825 | 149 | dual_timestamp timestamp; |
da7e457c | 150 | int state; |
eaa3cbef | 151 | |
6203e07a | 152 | bool exit_requested:1; |
da7e457c | 153 | bool need_process_child:1; |
cde93897 | 154 | bool watchdog:1; |
afc6adb5 | 155 | |
6203e07a LP |
156 | int exit_code; |
157 | ||
afc6adb5 LP |
158 | pid_t tid; |
159 | sd_event **default_event_ptr; | |
cde93897 LP |
160 | |
161 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
162 | |
163 | unsigned n_sources; | |
fd38203a LP |
164 | }; |
165 | ||
166 | static int pending_prioq_compare(const void *a, const void *b) { | |
167 | const sd_event_source *x = a, *y = b; | |
168 | ||
169 | assert(x->pending); | |
170 | assert(y->pending); | |
171 | ||
baf76283 LP |
172 | /* Enabled ones first */ |
173 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 174 | return -1; |
baf76283 | 175 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
176 | return 1; |
177 | ||
178 | /* Lower priority values first */ | |
179 | if (x->priority < y->priority) | |
180 | return -1; | |
181 | if (x->priority > y->priority) | |
182 | return 1; | |
183 | ||
184 | /* Older entries first */ | |
185 | if (x->pending_iteration < y->pending_iteration) | |
186 | return -1; | |
187 | if (x->pending_iteration > y->pending_iteration) | |
188 | return 1; | |
189 | ||
190 | /* Stability for the rest */ | |
191 | if (x < y) | |
192 | return -1; | |
dfcd88f6 | 193 | if (x > y) |
fd38203a LP |
194 | return 1; |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static int prepare_prioq_compare(const void *a, const void *b) { | |
200 | const sd_event_source *x = a, *y = b; | |
201 | ||
202 | assert(x->prepare); | |
203 | assert(y->prepare); | |
204 | ||
205 | /* Move most recently prepared ones last, so that we can stop | |
206 | * preparing as soon as we hit one that has already been | |
207 | * prepared in the current iteration */ | |
208 | if (x->prepare_iteration < y->prepare_iteration) | |
209 | return -1; | |
210 | if (x->prepare_iteration > y->prepare_iteration) | |
211 | return 1; | |
212 | ||
baf76283 LP |
213 | /* Enabled ones first */ |
214 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 215 | return -1; |
baf76283 | 216 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
217 | return 1; |
218 | ||
219 | /* Lower priority values first */ | |
220 | if (x->priority < y->priority) | |
221 | return -1; | |
222 | if (x->priority > y->priority) | |
223 | return 1; | |
224 | ||
225 | /* Stability for the rest */ | |
226 | if (x < y) | |
227 | return -1; | |
dfcd88f6 | 228 | if (x > y) |
fd38203a LP |
229 | return 1; |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
c2ba3ad6 | 234 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
235 | const sd_event_source *x = a, *y = b; |
236 | ||
237 | assert(x->type == SOURCE_MONOTONIC || x->type == SOURCE_REALTIME); | |
238 | assert(y->type == SOURCE_MONOTONIC || y->type == SOURCE_REALTIME); | |
239 | ||
baf76283 LP |
240 | /* Enabled ones first */ |
241 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 242 | return -1; |
baf76283 | 243 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
244 | return 1; |
245 | ||
246 | /* Move the pending ones to the end */ | |
247 | if (!x->pending && y->pending) | |
248 | return -1; | |
249 | if (x->pending && !y->pending) | |
250 | return 1; | |
251 | ||
252 | /* Order by time */ | |
253 | if (x->time.next < y->time.next) | |
254 | return -1; | |
255 | if (x->time.next > y->time.next) | |
a99badf5 | 256 | return 1; |
fd38203a LP |
257 | |
258 | /* Stability for the rest */ | |
259 | if (x < y) | |
260 | return -1; | |
dfcd88f6 | 261 | if (x > y) |
fd38203a LP |
262 | return 1; |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
c2ba3ad6 LP |
267 | static int latest_time_prioq_compare(const void *a, const void *b) { |
268 | const sd_event_source *x = a, *y = b; | |
269 | ||
da7e457c LP |
270 | assert((x->type == SOURCE_MONOTONIC && y->type == SOURCE_MONOTONIC) || |
271 | (x->type == SOURCE_REALTIME && y->type == SOURCE_REALTIME)); | |
c2ba3ad6 | 272 | |
baf76283 LP |
273 | /* Enabled ones first */ |
274 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 275 | return -1; |
baf76283 | 276 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
277 | return 1; |
278 | ||
279 | /* Move the pending ones to the end */ | |
280 | if (!x->pending && y->pending) | |
281 | return -1; | |
282 | if (x->pending && !y->pending) | |
283 | return 1; | |
284 | ||
285 | /* Order by time */ | |
286 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
287 | return -1; | |
288 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
a99badf5 | 289 | return 1; |
c2ba3ad6 LP |
290 | |
291 | /* Stability for the rest */ | |
292 | if (x < y) | |
293 | return -1; | |
294 | if (x > y) | |
295 | return 1; | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
6203e07a | 300 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
301 | const sd_event_source *x = a, *y = b; |
302 | ||
6203e07a LP |
303 | assert(x->type == SOURCE_EXIT); |
304 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 305 | |
baf76283 LP |
306 | /* Enabled ones first */ |
307 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 308 | return -1; |
baf76283 | 309 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
310 | return 1; |
311 | ||
312 | /* Lower priority values first */ | |
313 | if (x->priority < y->priority) | |
314 | return -1; | |
315 | if (x->priority > y->priority) | |
316 | return 1; | |
317 | ||
318 | /* Stability for the rest */ | |
319 | if (x < y) | |
320 | return -1; | |
321 | if (x > y) | |
322 | return 1; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
fd38203a LP |
327 | static void event_free(sd_event *e) { |
328 | assert(e); | |
15b38f93 | 329 | assert(e->n_sources == 0); |
fd38203a | 330 | |
afc6adb5 LP |
331 | if (e->default_event_ptr) |
332 | *(e->default_event_ptr) = NULL; | |
333 | ||
fd38203a LP |
334 | if (e->epoll_fd >= 0) |
335 | close_nointr_nofail(e->epoll_fd); | |
336 | ||
337 | if (e->signal_fd >= 0) | |
338 | close_nointr_nofail(e->signal_fd); | |
339 | ||
340 | if (e->realtime_fd >= 0) | |
341 | close_nointr_nofail(e->realtime_fd); | |
342 | ||
343 | if (e->monotonic_fd >= 0) | |
344 | close_nointr_nofail(e->monotonic_fd); | |
345 | ||
cde93897 LP |
346 | if (e->watchdog_fd >= 0) |
347 | close_nointr_nofail(e->watchdog_fd); | |
348 | ||
fd38203a LP |
349 | prioq_free(e->pending); |
350 | prioq_free(e->prepare); | |
c2ba3ad6 LP |
351 | prioq_free(e->monotonic_earliest); |
352 | prioq_free(e->monotonic_latest); | |
353 | prioq_free(e->realtime_earliest); | |
354 | prioq_free(e->realtime_latest); | |
6203e07a | 355 | prioq_free(e->exit); |
fd38203a LP |
356 | |
357 | free(e->signal_sources); | |
358 | ||
359 | hashmap_free(e->child_sources); | |
6e9feda3 | 360 | set_free(e->post_sources); |
fd38203a LP |
361 | free(e); |
362 | } | |
363 | ||
f7262a9f | 364 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
365 | sd_event *e; |
366 | int r; | |
367 | ||
305f78bf | 368 | assert_return(ret, -EINVAL); |
fd38203a LP |
369 | |
370 | e = new0(sd_event, 1); | |
371 | if (!e) | |
372 | return -ENOMEM; | |
373 | ||
da7e457c | 374 | e->n_ref = 1; |
cde93897 | 375 | e->signal_fd = e->realtime_fd = e->monotonic_fd = e->watchdog_fd = e->epoll_fd = -1; |
fd38203a | 376 | e->realtime_next = e->monotonic_next = (usec_t) -1; |
eaa3cbef | 377 | e->original_pid = getpid(); |
fd38203a LP |
378 | |
379 | assert_se(sigemptyset(&e->sigset) == 0); | |
380 | ||
381 | e->pending = prioq_new(pending_prioq_compare); | |
382 | if (!e->pending) { | |
383 | r = -ENOMEM; | |
384 | goto fail; | |
385 | } | |
386 | ||
387 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
388 | if (e->epoll_fd < 0) { | |
389 | r = -errno; | |
390 | goto fail; | |
391 | } | |
392 | ||
393 | *ret = e; | |
394 | return 0; | |
395 | ||
396 | fail: | |
397 | event_free(e); | |
398 | return r; | |
399 | } | |
400 | ||
f7262a9f | 401 | _public_ sd_event* sd_event_ref(sd_event *e) { |
305f78bf | 402 | assert_return(e, NULL); |
fd38203a | 403 | |
da7e457c LP |
404 | assert(e->n_ref >= 1); |
405 | e->n_ref++; | |
fd38203a LP |
406 | |
407 | return e; | |
408 | } | |
409 | ||
f7262a9f | 410 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
411 | |
412 | if (!e) | |
413 | return NULL; | |
fd38203a | 414 | |
da7e457c LP |
415 | assert(e->n_ref >= 1); |
416 | e->n_ref--; | |
417 | ||
418 | if (e->n_ref <= 0) | |
fd38203a LP |
419 | event_free(e); |
420 | ||
421 | return NULL; | |
422 | } | |
423 | ||
eaa3cbef LP |
424 | static bool event_pid_changed(sd_event *e) { |
425 | assert(e); | |
426 | ||
427 | /* We don't support people creating am event loop and keeping | |
428 | * it around over a fork(). Let's complain. */ | |
429 | ||
430 | return e->original_pid != getpid(); | |
431 | } | |
432 | ||
fd38203a LP |
433 | static int source_io_unregister(sd_event_source *s) { |
434 | int r; | |
435 | ||
436 | assert(s); | |
437 | assert(s->type == SOURCE_IO); | |
438 | ||
439 | if (!s->io.registered) | |
440 | return 0; | |
441 | ||
442 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
443 | if (r < 0) | |
444 | return -errno; | |
445 | ||
446 | s->io.registered = false; | |
447 | return 0; | |
448 | } | |
449 | ||
305f78bf LP |
450 | static int source_io_register( |
451 | sd_event_source *s, | |
452 | int enabled, | |
453 | uint32_t events) { | |
454 | ||
fd38203a LP |
455 | struct epoll_event ev = {}; |
456 | int r; | |
457 | ||
458 | assert(s); | |
459 | assert(s->type == SOURCE_IO); | |
baf76283 | 460 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
461 | |
462 | ev.events = events; | |
463 | ev.data.ptr = s; | |
464 | ||
baf76283 | 465 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
466 | ev.events |= EPOLLONESHOT; |
467 | ||
468 | if (s->io.registered) | |
469 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
470 | else | |
471 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
472 | ||
473 | if (r < 0) | |
474 | return -errno; | |
475 | ||
476 | s->io.registered = true; | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
481 | static void source_free(sd_event_source *s) { | |
482 | assert(s); | |
483 | ||
484 | if (s->event) { | |
15b38f93 LP |
485 | assert(s->event->n_sources > 0); |
486 | ||
fd38203a LP |
487 | switch (s->type) { |
488 | ||
489 | case SOURCE_IO: | |
490 | if (s->io.fd >= 0) | |
491 | source_io_unregister(s); | |
492 | ||
493 | break; | |
494 | ||
495 | case SOURCE_MONOTONIC: | |
c2ba3ad6 LP |
496 | prioq_remove(s->event->monotonic_earliest, s, &s->time.earliest_index); |
497 | prioq_remove(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
498 | break; |
499 | ||
500 | case SOURCE_REALTIME: | |
c2ba3ad6 LP |
501 | prioq_remove(s->event->realtime_earliest, s, &s->time.earliest_index); |
502 | prioq_remove(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
503 | break; |
504 | ||
505 | case SOURCE_SIGNAL: | |
506 | if (s->signal.sig > 0) { | |
baf76283 | 507 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) |
fd38203a LP |
508 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
509 | ||
510 | if (s->event->signal_sources) | |
511 | s->event->signal_sources[s->signal.sig] = NULL; | |
512 | } | |
513 | ||
514 | break; | |
515 | ||
516 | case SOURCE_CHILD: | |
517 | if (s->child.pid > 0) { | |
baf76283 LP |
518 | if (s->enabled != SD_EVENT_OFF) { |
519 | assert(s->event->n_enabled_child_sources > 0); | |
520 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
521 | } |
522 | ||
523 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) | |
524 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
525 | ||
526 | hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid)); | |
527 | } | |
528 | ||
529 | break; | |
da7e457c | 530 | |
0eb2e0e3 ZJS |
531 | case SOURCE_DEFER: |
532 | /* nothing */ | |
533 | break; | |
534 | ||
6e9feda3 LP |
535 | case SOURCE_POST: |
536 | set_remove(s->event->post_sources, s); | |
537 | break; | |
538 | ||
6203e07a LP |
539 | case SOURCE_EXIT: |
540 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
da7e457c | 541 | break; |
9d3e3aa5 LP |
542 | |
543 | case SOURCE_WATCHDOG: | |
544 | assert_not_reached("Wut? I shouldn't exist."); | |
fd38203a LP |
545 | } |
546 | ||
547 | if (s->pending) | |
548 | prioq_remove(s->event->pending, s, &s->pending_index); | |
549 | ||
550 | if (s->prepare) | |
551 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
552 | ||
15b38f93 | 553 | s->event->n_sources--; |
fd38203a LP |
554 | sd_event_unref(s->event); |
555 | } | |
556 | ||
557 | free(s); | |
558 | } | |
559 | ||
560 | static int source_set_pending(sd_event_source *s, bool b) { | |
561 | int r; | |
562 | ||
563 | assert(s); | |
6203e07a | 564 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
565 | |
566 | if (s->pending == b) | |
567 | return 0; | |
568 | ||
569 | s->pending = b; | |
570 | ||
571 | if (b) { | |
572 | s->pending_iteration = s->event->iteration; | |
573 | ||
574 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
575 | if (r < 0) { | |
576 | s->pending = false; | |
577 | return r; | |
578 | } | |
579 | } else | |
580 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
581 | ||
2576a19e LP |
582 | if (s->type == SOURCE_REALTIME) { |
583 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); | |
584 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
585 | } else if (s->type == SOURCE_MONOTONIC) { | |
586 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); | |
587 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
588 | } | |
589 | ||
fd38203a LP |
590 | return 0; |
591 | } | |
592 | ||
593 | static sd_event_source *source_new(sd_event *e, EventSourceType type) { | |
594 | sd_event_source *s; | |
595 | ||
596 | assert(e); | |
597 | ||
598 | s = new0(sd_event_source, 1); | |
599 | if (!s) | |
600 | return NULL; | |
601 | ||
da7e457c | 602 | s->n_ref = 1; |
fd38203a LP |
603 | s->event = sd_event_ref(e); |
604 | s->type = type; | |
fd38203a LP |
605 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
606 | ||
15b38f93 LP |
607 | e->n_sources ++; |
608 | ||
fd38203a LP |
609 | return s; |
610 | } | |
611 | ||
f7262a9f | 612 | _public_ int sd_event_add_io( |
fd38203a | 613 | sd_event *e, |
151b9b96 | 614 | sd_event_source **ret, |
fd38203a LP |
615 | int fd, |
616 | uint32_t events, | |
718db961 | 617 | sd_event_io_handler_t callback, |
151b9b96 | 618 | void *userdata) { |
fd38203a LP |
619 | |
620 | sd_event_source *s; | |
621 | int r; | |
622 | ||
305f78bf LP |
623 | assert_return(e, -EINVAL); |
624 | assert_return(fd >= 0, -EINVAL); | |
2a16a986 | 625 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf LP |
626 | assert_return(callback, -EINVAL); |
627 | assert_return(ret, -EINVAL); | |
da7e457c | 628 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 629 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
630 | |
631 | s = source_new(e, SOURCE_IO); | |
632 | if (!s) | |
633 | return -ENOMEM; | |
634 | ||
635 | s->io.fd = fd; | |
636 | s->io.events = events; | |
637 | s->io.callback = callback; | |
638 | s->userdata = userdata; | |
baf76283 | 639 | s->enabled = SD_EVENT_ON; |
fd38203a | 640 | |
baf76283 | 641 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
642 | if (r < 0) { |
643 | source_free(s); | |
644 | return -errno; | |
645 | } | |
646 | ||
647 | *ret = s; | |
648 | return 0; | |
649 | } | |
650 | ||
651 | static int event_setup_timer_fd( | |
652 | sd_event *e, | |
653 | EventSourceType type, | |
654 | int *timer_fd, | |
655 | clockid_t id) { | |
656 | ||
39883f62 | 657 | sd_id128_t bootid = {}; |
fd38203a LP |
658 | struct epoll_event ev = {}; |
659 | int r, fd; | |
660 | ||
661 | assert(e); | |
662 | assert(timer_fd); | |
663 | ||
664 | if (_likely_(*timer_fd >= 0)) | |
665 | return 0; | |
666 | ||
667 | fd = timerfd_create(id, TFD_NONBLOCK|TFD_CLOEXEC); | |
668 | if (fd < 0) | |
669 | return -errno; | |
670 | ||
671 | ev.events = EPOLLIN; | |
672 | ev.data.ptr = INT_TO_PTR(type); | |
673 | ||
674 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
675 | if (r < 0) { | |
676 | close_nointr_nofail(fd); | |
677 | return -errno; | |
678 | } | |
679 | ||
c2ba3ad6 | 680 | /* When we sleep for longer, we try to realign the wakeup to |
850516e0 LP |
681 | the same time wihtin each minute/second/250ms, so that |
682 | events all across the system can be coalesced into a single | |
683 | CPU wakeup. However, let's take some system-specific | |
684 | randomness for this value, so that in a network of systems | |
685 | with synced clocks timer events are distributed a | |
686 | bit. Here, we calculate a perturbation usec offset from the | |
687 | boot ID. */ | |
c2ba3ad6 LP |
688 | |
689 | if (sd_id128_get_boot(&bootid) >= 0) | |
850516e0 | 690 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; |
c2ba3ad6 | 691 | |
fd38203a LP |
692 | *timer_fd = fd; |
693 | return 0; | |
694 | } | |
695 | ||
696 | static int event_add_time_internal( | |
697 | sd_event *e, | |
151b9b96 | 698 | sd_event_source **ret, |
fd38203a LP |
699 | EventSourceType type, |
700 | int *timer_fd, | |
701 | clockid_t id, | |
c2ba3ad6 LP |
702 | Prioq **earliest, |
703 | Prioq **latest, | |
fd38203a | 704 | uint64_t usec, |
c2ba3ad6 | 705 | uint64_t accuracy, |
718db961 | 706 | sd_event_time_handler_t callback, |
151b9b96 | 707 | void *userdata) { |
fd38203a LP |
708 | |
709 | sd_event_source *s; | |
710 | int r; | |
711 | ||
305f78bf LP |
712 | assert_return(e, -EINVAL); |
713 | assert_return(callback, -EINVAL); | |
714 | assert_return(ret, -EINVAL); | |
715 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
716 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
da7e457c | 717 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 718 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
719 | |
720 | assert(timer_fd); | |
c2ba3ad6 LP |
721 | assert(earliest); |
722 | assert(latest); | |
723 | ||
724 | if (!*earliest) { | |
725 | *earliest = prioq_new(earliest_time_prioq_compare); | |
726 | if (!*earliest) | |
727 | return -ENOMEM; | |
728 | } | |
fd38203a | 729 | |
c2ba3ad6 LP |
730 | if (!*latest) { |
731 | *latest = prioq_new(latest_time_prioq_compare); | |
732 | if (!*latest) | |
fd38203a LP |
733 | return -ENOMEM; |
734 | } | |
735 | ||
736 | if (*timer_fd < 0) { | |
737 | r = event_setup_timer_fd(e, type, timer_fd, id); | |
738 | if (r < 0) | |
739 | return r; | |
740 | } | |
741 | ||
742 | s = source_new(e, type); | |
743 | if (!s) | |
744 | return -ENOMEM; | |
745 | ||
746 | s->time.next = usec; | |
c2ba3ad6 | 747 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 748 | s->time.callback = callback; |
da7e457c | 749 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 750 | s->userdata = userdata; |
baf76283 | 751 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 752 | |
c2ba3ad6 LP |
753 | r = prioq_put(*earliest, s, &s->time.earliest_index); |
754 | if (r < 0) | |
755 | goto fail; | |
756 | ||
757 | r = prioq_put(*latest, s, &s->time.latest_index); | |
758 | if (r < 0) | |
759 | goto fail; | |
fd38203a LP |
760 | |
761 | *ret = s; | |
762 | return 0; | |
c2ba3ad6 LP |
763 | |
764 | fail: | |
765 | source_free(s); | |
766 | return r; | |
fd38203a LP |
767 | } |
768 | ||
f7262a9f | 769 | _public_ int sd_event_add_monotonic(sd_event *e, |
151b9b96 | 770 | sd_event_source **ret, |
f7262a9f ZJS |
771 | uint64_t usec, |
772 | uint64_t accuracy, | |
718db961 | 773 | sd_event_time_handler_t callback, |
151b9b96 | 774 | void *userdata) { |
f7262a9f | 775 | |
151b9b96 | 776 | return event_add_time_internal(e, ret, SOURCE_MONOTONIC, &e->monotonic_fd, CLOCK_MONOTONIC, &e->monotonic_earliest, &e->monotonic_latest, usec, accuracy, callback, userdata); |
fd38203a LP |
777 | } |
778 | ||
f7262a9f | 779 | _public_ int sd_event_add_realtime(sd_event *e, |
151b9b96 | 780 | sd_event_source **ret, |
f7262a9f ZJS |
781 | uint64_t usec, |
782 | uint64_t accuracy, | |
718db961 | 783 | sd_event_time_handler_t callback, |
151b9b96 | 784 | void *userdata) { |
f7262a9f | 785 | |
9ac441c0 | 786 | return event_add_time_internal(e, ret, SOURCE_REALTIME, &e->realtime_fd, CLOCK_REALTIME, &e->realtime_earliest, &e->realtime_latest, usec, accuracy, callback, userdata); |
fd38203a LP |
787 | } |
788 | ||
789 | static int event_update_signal_fd(sd_event *e) { | |
790 | struct epoll_event ev = {}; | |
791 | bool add_to_epoll; | |
792 | int r; | |
793 | ||
794 | assert(e); | |
795 | ||
796 | add_to_epoll = e->signal_fd < 0; | |
797 | ||
798 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
799 | if (r < 0) | |
800 | return -errno; | |
801 | ||
802 | e->signal_fd = r; | |
803 | ||
804 | if (!add_to_epoll) | |
805 | return 0; | |
806 | ||
807 | ev.events = EPOLLIN; | |
808 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
809 | ||
810 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
811 | if (r < 0) { | |
812 | close_nointr_nofail(e->signal_fd); | |
813 | e->signal_fd = -1; | |
814 | ||
815 | return -errno; | |
816 | } | |
817 | ||
818 | return 0; | |
819 | } | |
820 | ||
f7262a9f | 821 | _public_ int sd_event_add_signal( |
305f78bf | 822 | sd_event *e, |
151b9b96 | 823 | sd_event_source **ret, |
305f78bf | 824 | int sig, |
718db961 | 825 | sd_event_signal_handler_t callback, |
151b9b96 | 826 | void *userdata) { |
305f78bf | 827 | |
fd38203a | 828 | sd_event_source *s; |
3022d74b | 829 | sigset_t ss; |
fd38203a LP |
830 | int r; |
831 | ||
305f78bf LP |
832 | assert_return(e, -EINVAL); |
833 | assert_return(sig > 0, -EINVAL); | |
834 | assert_return(sig < _NSIG, -EINVAL); | |
835 | assert_return(callback, -EINVAL); | |
836 | assert_return(ret, -EINVAL); | |
da7e457c | 837 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 838 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 839 | |
3022d74b LP |
840 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
841 | if (r < 0) | |
842 | return -errno; | |
843 | ||
844 | if (!sigismember(&ss, sig)) | |
845 | return -EBUSY; | |
846 | ||
fd38203a LP |
847 | if (!e->signal_sources) { |
848 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
849 | if (!e->signal_sources) | |
850 | return -ENOMEM; | |
851 | } else if (e->signal_sources[sig]) | |
852 | return -EBUSY; | |
853 | ||
854 | s = source_new(e, SOURCE_SIGNAL); | |
855 | if (!s) | |
856 | return -ENOMEM; | |
857 | ||
858 | s->signal.sig = sig; | |
859 | s->signal.callback = callback; | |
860 | s->userdata = userdata; | |
baf76283 | 861 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
862 | |
863 | e->signal_sources[sig] = s; | |
864 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
865 | ||
baf76283 | 866 | if (sig != SIGCHLD || e->n_enabled_child_sources == 0) { |
fd38203a LP |
867 | r = event_update_signal_fd(e); |
868 | if (r < 0) { | |
869 | source_free(s); | |
870 | return r; | |
871 | } | |
872 | } | |
873 | ||
874 | *ret = s; | |
875 | return 0; | |
876 | } | |
877 | ||
f7262a9f | 878 | _public_ int sd_event_add_child( |
305f78bf | 879 | sd_event *e, |
151b9b96 | 880 | sd_event_source **ret, |
305f78bf LP |
881 | pid_t pid, |
882 | int options, | |
718db961 | 883 | sd_event_child_handler_t callback, |
151b9b96 | 884 | void *userdata) { |
305f78bf | 885 | |
fd38203a LP |
886 | sd_event_source *s; |
887 | int r; | |
888 | ||
305f78bf LP |
889 | assert_return(e, -EINVAL); |
890 | assert_return(pid > 1, -EINVAL); | |
891 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
892 | assert_return(options != 0, -EINVAL); | |
893 | assert_return(callback, -EINVAL); | |
894 | assert_return(ret, -EINVAL); | |
da7e457c | 895 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 896 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
897 | |
898 | r = hashmap_ensure_allocated(&e->child_sources, trivial_hash_func, trivial_compare_func); | |
899 | if (r < 0) | |
900 | return r; | |
901 | ||
902 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
903 | return -EBUSY; | |
904 | ||
905 | s = source_new(e, SOURCE_CHILD); | |
906 | if (!s) | |
907 | return -ENOMEM; | |
908 | ||
909 | s->child.pid = pid; | |
910 | s->child.options = options; | |
911 | s->child.callback = callback; | |
912 | s->userdata = userdata; | |
baf76283 | 913 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
914 | |
915 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
916 | if (r < 0) { | |
917 | source_free(s); | |
918 | return r; | |
919 | } | |
920 | ||
baf76283 | 921 | e->n_enabled_child_sources ++; |
fd38203a LP |
922 | |
923 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
924 | ||
925 | if (!e->signal_sources || !e->signal_sources[SIGCHLD]) { | |
926 | r = event_update_signal_fd(e); | |
927 | if (r < 0) { | |
928 | source_free(s); | |
929 | return -errno; | |
930 | } | |
931 | } | |
932 | ||
c2ba3ad6 LP |
933 | e->need_process_child = true; |
934 | ||
fd38203a LP |
935 | *ret = s; |
936 | return 0; | |
937 | } | |
938 | ||
f7262a9f | 939 | _public_ int sd_event_add_defer( |
305f78bf | 940 | sd_event *e, |
151b9b96 | 941 | sd_event_source **ret, |
718db961 | 942 | sd_event_handler_t callback, |
151b9b96 | 943 | void *userdata) { |
305f78bf | 944 | |
fd38203a LP |
945 | sd_event_source *s; |
946 | int r; | |
947 | ||
305f78bf LP |
948 | assert_return(e, -EINVAL); |
949 | assert_return(callback, -EINVAL); | |
950 | assert_return(ret, -EINVAL); | |
da7e457c | 951 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 952 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
953 | |
954 | s = source_new(e, SOURCE_DEFER); | |
955 | if (!s) | |
956 | return -ENOMEM; | |
957 | ||
958 | s->defer.callback = callback; | |
959 | s->userdata = userdata; | |
baf76283 | 960 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
961 | |
962 | r = source_set_pending(s, true); | |
963 | if (r < 0) { | |
964 | source_free(s); | |
965 | return r; | |
966 | } | |
967 | ||
968 | *ret = s; | |
969 | return 0; | |
970 | } | |
971 | ||
6e9feda3 LP |
972 | _public_ int sd_event_add_post( |
973 | sd_event *e, | |
974 | sd_event_source **ret, | |
975 | sd_event_handler_t callback, | |
976 | void *userdata) { | |
977 | ||
978 | sd_event_source *s; | |
979 | int r; | |
980 | ||
981 | assert_return(e, -EINVAL); | |
982 | assert_return(callback, -EINVAL); | |
983 | assert_return(ret, -EINVAL); | |
984 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
985 | assert_return(!event_pid_changed(e), -ECHILD); | |
986 | ||
987 | r = set_ensure_allocated(&e->post_sources, trivial_hash_func, trivial_compare_func); | |
988 | if (r < 0) | |
989 | return r; | |
990 | ||
991 | s = source_new(e, SOURCE_POST); | |
992 | if (!s) | |
993 | return -ENOMEM; | |
994 | ||
995 | s->post.callback = callback; | |
996 | s->userdata = userdata; | |
997 | s->enabled = SD_EVENT_ON; | |
998 | ||
999 | r = set_put(e->post_sources, s); | |
1000 | if (r < 0) { | |
1001 | source_free(s); | |
1002 | return r; | |
1003 | } | |
1004 | ||
1005 | *ret = s; | |
1006 | return 0; | |
1007 | } | |
1008 | ||
6203e07a | 1009 | _public_ int sd_event_add_exit( |
305f78bf | 1010 | sd_event *e, |
151b9b96 | 1011 | sd_event_source **ret, |
718db961 | 1012 | sd_event_handler_t callback, |
151b9b96 | 1013 | void *userdata) { |
305f78bf | 1014 | |
da7e457c LP |
1015 | sd_event_source *s; |
1016 | int r; | |
1017 | ||
1018 | assert_return(e, -EINVAL); | |
1019 | assert_return(callback, -EINVAL); | |
305f78bf | 1020 | assert_return(ret, -EINVAL); |
da7e457c LP |
1021 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1022 | assert_return(!event_pid_changed(e), -ECHILD); | |
1023 | ||
6203e07a LP |
1024 | if (!e->exit) { |
1025 | e->exit = prioq_new(exit_prioq_compare); | |
1026 | if (!e->exit) | |
da7e457c LP |
1027 | return -ENOMEM; |
1028 | } | |
1029 | ||
6203e07a | 1030 | s = source_new(e, SOURCE_EXIT); |
fd38203a | 1031 | if (!s) |
da7e457c | 1032 | return -ENOMEM; |
fd38203a | 1033 | |
6203e07a | 1034 | s->exit.callback = callback; |
da7e457c | 1035 | s->userdata = userdata; |
6203e07a | 1036 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1037 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1038 | |
6203e07a | 1039 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1040 | if (r < 0) { |
1041 | source_free(s); | |
1042 | return r; | |
1043 | } | |
1044 | ||
1045 | *ret = s; | |
1046 | return 0; | |
1047 | } | |
1048 | ||
f7262a9f | 1049 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
da7e457c LP |
1050 | assert_return(s, NULL); |
1051 | ||
1052 | assert(s->n_ref >= 1); | |
1053 | s->n_ref++; | |
fd38203a LP |
1054 | |
1055 | return s; | |
1056 | } | |
1057 | ||
f7262a9f | 1058 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1059 | |
1060 | if (!s) | |
1061 | return NULL; | |
fd38203a | 1062 | |
da7e457c LP |
1063 | assert(s->n_ref >= 1); |
1064 | s->n_ref--; | |
1065 | ||
12179984 LP |
1066 | if (s->n_ref <= 0) { |
1067 | /* Here's a special hack: when we are called from a | |
1068 | * dispatch handler we won't free the event source | |
1069 | * immediately, but we will detach the fd from the | |
1070 | * epoll. This way it is safe for the caller to unref | |
1071 | * the event source and immediately close the fd, but | |
1072 | * we still retain a valid event source object after | |
1073 | * the callback. */ | |
1074 | ||
1075 | if (s->dispatching) { | |
1076 | if (s->type == SOURCE_IO) | |
1077 | source_io_unregister(s); | |
1078 | } else | |
1079 | source_free(s); | |
1080 | } | |
fd38203a LP |
1081 | |
1082 | return NULL; | |
1083 | } | |
1084 | ||
adcc4ca3 | 1085 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1086 | assert_return(s, NULL); |
eaa3cbef LP |
1087 | |
1088 | return s->event; | |
1089 | } | |
1090 | ||
f7262a9f | 1091 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1092 | assert_return(s, -EINVAL); |
6203e07a | 1093 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1094 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1095 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1096 | |
1097 | return s->pending; | |
1098 | } | |
1099 | ||
f7262a9f | 1100 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1101 | assert_return(s, -EINVAL); |
1102 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1103 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1104 | |
1105 | return s->io.fd; | |
1106 | } | |
1107 | ||
30caf8f3 LP |
1108 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1109 | int r; | |
1110 | ||
1111 | assert_return(s, -EINVAL); | |
1112 | assert_return(fd >= 0, -EINVAL); | |
1113 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1114 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1115 | ||
1116 | if (s->io.fd == fd) | |
1117 | return 0; | |
1118 | ||
1119 | if (s->enabled == SD_EVENT_OFF) { | |
1120 | s->io.fd = fd; | |
1121 | s->io.registered = false; | |
1122 | } else { | |
1123 | int saved_fd; | |
1124 | ||
1125 | saved_fd = s->io.fd; | |
1126 | assert(s->io.registered); | |
1127 | ||
1128 | s->io.fd = fd; | |
1129 | s->io.registered = false; | |
1130 | ||
1131 | r = source_io_register(s, s->enabled, s->io.events); | |
1132 | if (r < 0) { | |
1133 | s->io.fd = saved_fd; | |
1134 | s->io.registered = true; | |
1135 | return r; | |
1136 | } | |
1137 | ||
1138 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1139 | } | |
1140 | ||
1141 | return 0; | |
1142 | } | |
1143 | ||
f7262a9f | 1144 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1145 | assert_return(s, -EINVAL); |
1146 | assert_return(events, -EINVAL); | |
1147 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1148 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1149 | |
1150 | *events = s->io.events; | |
1151 | return 0; | |
1152 | } | |
1153 | ||
f7262a9f | 1154 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1155 | int r; |
1156 | ||
305f78bf LP |
1157 | assert_return(s, -EINVAL); |
1158 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1159 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1160 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1161 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1162 | |
1163 | if (s->io.events == events) | |
1164 | return 0; | |
1165 | ||
baf76283 | 1166 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1167 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1168 | if (r < 0) |
1169 | return r; | |
1170 | } | |
1171 | ||
1172 | s->io.events = events; | |
503f39c3 | 1173 | source_set_pending(s, false); |
fd38203a LP |
1174 | |
1175 | return 0; | |
1176 | } | |
1177 | ||
f7262a9f | 1178 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1179 | assert_return(s, -EINVAL); |
1180 | assert_return(revents, -EINVAL); | |
1181 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1182 | assert_return(s->pending, -ENODATA); | |
1183 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1184 | |
1185 | *revents = s->io.revents; | |
1186 | return 0; | |
1187 | } | |
1188 | ||
f7262a9f | 1189 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1190 | assert_return(s, -EINVAL); |
1191 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1192 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1193 | |
1194 | return s->signal.sig; | |
1195 | } | |
1196 | ||
31927c16 | 1197 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1198 | assert_return(s, -EINVAL); |
1199 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1200 | |
1201 | return s->priority; | |
1202 | } | |
1203 | ||
31927c16 | 1204 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
305f78bf | 1205 | assert_return(s, -EINVAL); |
da7e457c | 1206 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1207 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1208 | |
1209 | if (s->priority == priority) | |
1210 | return 0; | |
1211 | ||
1212 | s->priority = priority; | |
1213 | ||
1214 | if (s->pending) | |
c2ba3ad6 | 1215 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1216 | |
1217 | if (s->prepare) | |
c2ba3ad6 | 1218 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1219 | |
6203e07a LP |
1220 | if (s->type == SOURCE_EXIT) |
1221 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1222 | |
fd38203a LP |
1223 | return 0; |
1224 | } | |
1225 | ||
f7262a9f | 1226 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1227 | assert_return(s, -EINVAL); |
1228 | assert_return(m, -EINVAL); | |
1229 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1230 | |
baf76283 | 1231 | *m = s->enabled; |
fd38203a LP |
1232 | return 0; |
1233 | } | |
1234 | ||
f7262a9f | 1235 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1236 | int r; |
1237 | ||
305f78bf LP |
1238 | assert_return(s, -EINVAL); |
1239 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
da7e457c | 1240 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1241 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1242 | |
baf76283 | 1243 | if (s->enabled == m) |
fd38203a LP |
1244 | return 0; |
1245 | ||
baf76283 | 1246 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1247 | |
1248 | switch (s->type) { | |
1249 | ||
1250 | case SOURCE_IO: | |
1251 | r = source_io_unregister(s); | |
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 LP |
1271 | s->enabled = m; |
1272 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { | |
fd38203a LP |
1273 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
1274 | event_update_signal_fd(s->event); | |
1275 | } | |
1276 | ||
1277 | break; | |
1278 | ||
1279 | case SOURCE_CHILD: | |
baf76283 | 1280 | s->enabled = m; |
fd38203a | 1281 | |
baf76283 LP |
1282 | assert(s->event->n_enabled_child_sources > 0); |
1283 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
1284 | |
1285 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1286 | assert_se(sigdelset(&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: | |
6e9feda3 | 1298 | case SOURCE_POST: |
baf76283 | 1299 | s->enabled = m; |
fd38203a | 1300 | break; |
9d3e3aa5 LP |
1301 | |
1302 | case SOURCE_WATCHDOG: | |
1303 | assert_not_reached("Wut? I shouldn't exist."); | |
fd38203a LP |
1304 | } |
1305 | ||
1306 | } else { | |
1307 | switch (s->type) { | |
1308 | ||
1309 | case SOURCE_IO: | |
1310 | r = source_io_register(s, m, s->io.events); | |
1311 | if (r < 0) | |
1312 | return r; | |
1313 | ||
baf76283 | 1314 | s->enabled = m; |
fd38203a LP |
1315 | break; |
1316 | ||
1317 | case SOURCE_MONOTONIC: | |
baf76283 | 1318 | s->enabled = m; |
c2ba3ad6 LP |
1319 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); |
1320 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
1321 | break; |
1322 | ||
1323 | case SOURCE_REALTIME: | |
baf76283 | 1324 | s->enabled = m; |
c2ba3ad6 LP |
1325 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); |
1326 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
1327 | break; |
1328 | ||
1329 | case SOURCE_SIGNAL: | |
baf76283 | 1330 | s->enabled = m; |
fd38203a | 1331 | |
baf76283 | 1332 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { |
fd38203a LP |
1333 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
1334 | event_update_signal_fd(s->event); | |
1335 | } | |
1336 | break; | |
1337 | ||
1338 | case SOURCE_CHILD: | |
baf76283 LP |
1339 | if (s->enabled == SD_EVENT_OFF) { |
1340 | s->event->n_enabled_child_sources++; | |
fd38203a LP |
1341 | |
1342 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1343 | assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0); | |
1344 | event_update_signal_fd(s->event); | |
1345 | } | |
1346 | } | |
7a0d4a3d DH |
1347 | |
1348 | s->enabled = m; | |
fd38203a LP |
1349 | break; |
1350 | ||
6203e07a | 1351 | case SOURCE_EXIT: |
305f78bf | 1352 | s->enabled = m; |
6203e07a | 1353 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1354 | break; |
1355 | ||
1356 | case SOURCE_DEFER: | |
6e9feda3 | 1357 | case SOURCE_POST: |
baf76283 | 1358 | s->enabled = m; |
fd38203a | 1359 | break; |
9d3e3aa5 LP |
1360 | |
1361 | case SOURCE_WATCHDOG: | |
1362 | assert_not_reached("Wut? I shouldn't exist."); | |
fd38203a LP |
1363 | } |
1364 | } | |
1365 | ||
1366 | if (s->pending) | |
1367 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1368 | ||
1369 | if (s->prepare) | |
1370 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1371 | ||
1372 | return 0; | |
1373 | } | |
1374 | ||
f7262a9f | 1375 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1376 | assert_return(s, -EINVAL); |
1377 | assert_return(usec, -EINVAL); | |
1378 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1379 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1380 | |
1381 | *usec = s->time.next; | |
1382 | return 0; | |
1383 | } | |
1384 | ||
f7262a9f | 1385 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
305f78bf LP |
1386 | assert_return(s, -EINVAL); |
1387 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1388 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1389 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1390 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1391 | |
fd38203a | 1392 | s->time.next = usec; |
2576a19e | 1393 | |
0cc1125a | 1394 | source_set_pending(s, false); |
fd38203a | 1395 | |
c2ba3ad6 LP |
1396 | if (s->type == SOURCE_REALTIME) { |
1397 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); | |
1398 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1399 | } else { | |
1400 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); | |
1401 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1402 | } | |
fd38203a LP |
1403 | |
1404 | return 0; | |
1405 | } | |
1406 | ||
f7262a9f | 1407 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1408 | assert_return(s, -EINVAL); |
1409 | assert_return(usec, -EINVAL); | |
1410 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1411 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1412 | ||
1413 | *usec = s->time.accuracy; | |
1414 | return 0; | |
1415 | } | |
1416 | ||
f7262a9f | 1417 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
305f78bf LP |
1418 | assert_return(s, -EINVAL); |
1419 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1420 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1421 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1422 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1423 | |
1424 | if (usec == 0) | |
1425 | usec = DEFAULT_ACCURACY_USEC; | |
1426 | ||
eaa3cbef LP |
1427 | s->time.accuracy = usec; |
1428 | ||
2576a19e LP |
1429 | source_set_pending(s, false); |
1430 | ||
eaa3cbef LP |
1431 | if (s->type == SOURCE_REALTIME) |
1432 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1433 | else | |
1434 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1435 | ||
1436 | return 0; | |
1437 | } | |
1438 | ||
f7262a9f | 1439 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1440 | assert_return(s, -EINVAL); |
1441 | assert_return(pid, -EINVAL); | |
1442 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1443 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1444 | ||
1445 | *pid = s->child.pid; | |
1446 | return 0; | |
1447 | } | |
1448 | ||
718db961 | 1449 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1450 | int r; |
1451 | ||
da7e457c | 1452 | assert_return(s, -EINVAL); |
6203e07a | 1453 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1454 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1455 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1456 | |
1457 | if (s->prepare == callback) | |
1458 | return 0; | |
1459 | ||
1460 | if (callback && s->prepare) { | |
1461 | s->prepare = callback; | |
1462 | return 0; | |
1463 | } | |
1464 | ||
1465 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1466 | if (r < 0) | |
1467 | return r; | |
1468 | ||
1469 | s->prepare = callback; | |
1470 | ||
1471 | if (callback) { | |
1472 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1473 | if (r < 0) | |
1474 | return r; | |
1475 | } else | |
1476 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1477 | ||
1478 | return 0; | |
1479 | } | |
1480 | ||
f7262a9f | 1481 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1482 | assert_return(s, NULL); |
fd38203a LP |
1483 | |
1484 | return s->userdata; | |
1485 | } | |
1486 | ||
8f726607 LP |
1487 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1488 | void *ret; | |
1489 | ||
1490 | assert_return(s, NULL); | |
1491 | ||
1492 | ret = s->userdata; | |
1493 | s->userdata = userdata; | |
1494 | ||
1495 | return ret; | |
1496 | } | |
1497 | ||
c2ba3ad6 LP |
1498 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1499 | usec_t c; | |
1500 | assert(e); | |
1501 | assert(a <= b); | |
1502 | ||
1503 | if (a <= 0) | |
1504 | return 0; | |
1505 | ||
1506 | if (b <= a + 1) | |
1507 | return a; | |
1508 | ||
1509 | /* | |
1510 | Find a good time to wake up again between times a and b. We | |
1511 | have two goals here: | |
1512 | ||
1513 | a) We want to wake up as seldom as possible, hence prefer | |
1514 | later times over earlier times. | |
1515 | ||
1516 | b) But if we have to wake up, then let's make sure to | |
1517 | dispatch as much as possible on the entire system. | |
1518 | ||
1519 | We implement this by waking up everywhere at the same time | |
850516e0 | 1520 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1521 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1522 | then we try to find the same spot in every 10s, then 1s and |
1523 | then 250ms step. Otherwise, we pick the last possible time | |
1524 | to wake up. | |
c2ba3ad6 LP |
1525 | */ |
1526 | ||
850516e0 LP |
1527 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1528 | if (c >= b) { | |
1529 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1530 | return b; | |
1531 | ||
1532 | c -= USEC_PER_MINUTE; | |
1533 | } | |
1534 | ||
ba276c81 LP |
1535 | if (c >= a) |
1536 | return c; | |
1537 | ||
1538 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1539 | if (c >= b) { | |
1540 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1541 | return b; | |
1542 | ||
1543 | c -= USEC_PER_SEC*10; | |
1544 | } | |
1545 | ||
850516e0 LP |
1546 | if (c >= a) |
1547 | return c; | |
1548 | ||
1549 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1550 | if (c >= b) { |
1551 | if (_unlikely_(c < USEC_PER_SEC)) | |
1552 | return b; | |
1553 | ||
1554 | c -= USEC_PER_SEC; | |
1555 | } | |
1556 | ||
1557 | if (c >= a) | |
1558 | return c; | |
1559 | ||
1560 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1561 | if (c >= b) { | |
1562 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1563 | return b; | |
1564 | ||
1565 | c -= USEC_PER_MSEC*250; | |
1566 | } | |
1567 | ||
1568 | if (c >= a) | |
1569 | return c; | |
1570 | ||
1571 | return b; | |
1572 | } | |
1573 | ||
fd38203a LP |
1574 | static int event_arm_timer( |
1575 | sd_event *e, | |
1576 | int timer_fd, | |
c2ba3ad6 LP |
1577 | Prioq *earliest, |
1578 | Prioq *latest, | |
fd38203a LP |
1579 | usec_t *next) { |
1580 | ||
1581 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1582 | sd_event_source *a, *b; |
1583 | usec_t t; | |
fd38203a LP |
1584 | int r; |
1585 | ||
cde93897 LP |
1586 | assert(e); |
1587 | assert(next); | |
fd38203a | 1588 | |
c2ba3ad6 | 1589 | a = prioq_peek(earliest); |
72aedc1e LP |
1590 | if (!a || a->enabled == SD_EVENT_OFF) { |
1591 | ||
c57b5ca3 LP |
1592 | if (timer_fd < 0) |
1593 | return 0; | |
1594 | ||
72aedc1e LP |
1595 | if (*next == (usec_t) -1) |
1596 | return 0; | |
1597 | ||
1598 | /* disarm */ | |
1599 | r = timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1600 | if (r < 0) | |
1601 | return r; | |
1602 | ||
1603 | *next = (usec_t) -1; | |
1604 | ||
fd38203a | 1605 | return 0; |
72aedc1e | 1606 | } |
fd38203a | 1607 | |
c2ba3ad6 | 1608 | b = prioq_peek(latest); |
baf76283 | 1609 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1610 | |
1611 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
1612 | if (*next == t) | |
fd38203a LP |
1613 | return 0; |
1614 | ||
1615 | assert_se(timer_fd >= 0); | |
1616 | ||
c2ba3ad6 | 1617 | if (t == 0) { |
fd38203a LP |
1618 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1619 | its.it_value.tv_sec = 0; | |
1620 | its.it_value.tv_nsec = 1; | |
1621 | } else | |
c2ba3ad6 | 1622 | timespec_store(&its.it_value, t); |
fd38203a LP |
1623 | |
1624 | r = timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1625 | if (r < 0) | |
cde93897 | 1626 | return -errno; |
fd38203a | 1627 | |
c2ba3ad6 | 1628 | *next = t; |
fd38203a LP |
1629 | return 0; |
1630 | } | |
1631 | ||
9a800b56 | 1632 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
1633 | assert(e); |
1634 | assert(s); | |
1635 | assert(s->type == SOURCE_IO); | |
1636 | ||
9a800b56 LP |
1637 | /* If the event source was already pending, we just OR in the |
1638 | * new revents, otherwise we reset the value. The ORing is | |
1639 | * necessary to handle EPOLLONESHOT events properly where | |
1640 | * readability might happen independently of writability, and | |
1641 | * we need to keep track of both */ | |
1642 | ||
1643 | if (s->pending) | |
1644 | s->io.revents |= revents; | |
1645 | else | |
1646 | s->io.revents = revents; | |
fd38203a | 1647 | |
fd38203a LP |
1648 | return source_set_pending(s, true); |
1649 | } | |
1650 | ||
72aedc1e | 1651 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
1652 | uint64_t x; |
1653 | ssize_t ss; | |
1654 | ||
1655 | assert(e); | |
da7e457c | 1656 | assert(fd >= 0); |
72aedc1e | 1657 | |
305f78bf | 1658 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1659 | |
1660 | ss = read(fd, &x, sizeof(x)); | |
1661 | if (ss < 0) { | |
1662 | if (errno == EAGAIN || errno == EINTR) | |
1663 | return 0; | |
1664 | ||
1665 | return -errno; | |
1666 | } | |
1667 | ||
8d35dae7 | 1668 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
1669 | return -EIO; |
1670 | ||
cde93897 LP |
1671 | if (next) |
1672 | *next = (usec_t) -1; | |
72aedc1e | 1673 | |
fd38203a LP |
1674 | return 0; |
1675 | } | |
1676 | ||
305f78bf LP |
1677 | static int process_timer( |
1678 | sd_event *e, | |
1679 | usec_t n, | |
1680 | Prioq *earliest, | |
1681 | Prioq *latest) { | |
1682 | ||
fd38203a LP |
1683 | sd_event_source *s; |
1684 | int r; | |
1685 | ||
1686 | assert(e); | |
1687 | ||
1688 | for (;;) { | |
c2ba3ad6 | 1689 | s = prioq_peek(earliest); |
fd38203a LP |
1690 | if (!s || |
1691 | s->time.next > n || | |
baf76283 | 1692 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1693 | s->pending) |
1694 | break; | |
1695 | ||
1696 | r = source_set_pending(s, true); | |
1697 | if (r < 0) | |
1698 | return r; | |
1699 | ||
c2ba3ad6 LP |
1700 | prioq_reshuffle(earliest, s, &s->time.earliest_index); |
1701 | prioq_reshuffle(latest, s, &s->time.latest_index); | |
fd38203a LP |
1702 | } |
1703 | ||
1704 | return 0; | |
1705 | } | |
1706 | ||
1707 | static int process_child(sd_event *e) { | |
1708 | sd_event_source *s; | |
1709 | Iterator i; | |
1710 | int r; | |
1711 | ||
1712 | assert(e); | |
1713 | ||
c2ba3ad6 LP |
1714 | e->need_process_child = false; |
1715 | ||
fd38203a LP |
1716 | /* |
1717 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1718 | + WNOHANG for each PID we wait for, instead of using | |
1719 | P_ALL. This is because we only want to get child | |
1720 | information of very specific child processes, and not all | |
1721 | of them. We might not have processed the SIGCHLD even of a | |
1722 | previous invocation and we don't want to maintain a | |
1723 | unbounded *per-child* event queue, hence we really don't | |
1724 | want anything flushed out of the kernel's queue that we | |
1725 | don't care about. Since this is O(n) this means that if you | |
1726 | have a lot of processes you probably want to handle SIGCHLD | |
1727 | yourself. | |
08cd1552 LP |
1728 | |
1729 | We do not reap the children here (by using WNOWAIT), this | |
1730 | is only done after the event source is dispatched so that | |
1731 | the callback still sees the process as a zombie. | |
fd38203a LP |
1732 | */ |
1733 | ||
1734 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1735 | assert(s->type == SOURCE_CHILD); | |
1736 | ||
1737 | if (s->pending) | |
1738 | continue; | |
1739 | ||
baf76283 | 1740 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1741 | continue; |
1742 | ||
1743 | zero(s->child.siginfo); | |
08cd1552 LP |
1744 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
1745 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
1746 | if (r < 0) |
1747 | return -errno; | |
1748 | ||
1749 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
1750 | bool zombie = |
1751 | s->child.siginfo.si_code == CLD_EXITED || | |
1752 | s->child.siginfo.si_code == CLD_KILLED || | |
1753 | s->child.siginfo.si_code == CLD_DUMPED; | |
1754 | ||
1755 | if (!zombie && (s->child.options & WEXITED)) { | |
1756 | /* If the child isn't dead then let's | |
1757 | * immediately remove the state change | |
1758 | * from the queue, since there's no | |
1759 | * benefit in leaving it queued */ | |
1760 | ||
1761 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
1762 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
1763 | } | |
1764 | ||
fd38203a LP |
1765 | r = source_set_pending(s, true); |
1766 | if (r < 0) | |
1767 | return r; | |
1768 | } | |
1769 | } | |
1770 | ||
fd38203a LP |
1771 | return 0; |
1772 | } | |
1773 | ||
1774 | static int process_signal(sd_event *e, uint32_t events) { | |
fd38203a | 1775 | bool read_one = false; |
fd38203a LP |
1776 | int r; |
1777 | ||
da7e457c | 1778 | assert(e); |
0eb2e0e3 ZJS |
1779 | assert(e->signal_sources); |
1780 | ||
305f78bf | 1781 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1782 | |
1783 | for (;;) { | |
0eb2e0e3 ZJS |
1784 | struct signalfd_siginfo si; |
1785 | ssize_t ss; | |
fd38203a LP |
1786 | sd_event_source *s; |
1787 | ||
1788 | ss = read(e->signal_fd, &si, sizeof(si)); | |
1789 | if (ss < 0) { | |
1790 | if (errno == EAGAIN || errno == EINTR) | |
1791 | return read_one; | |
1792 | ||
1793 | return -errno; | |
1794 | } | |
1795 | ||
8d35dae7 | 1796 | if (_unlikely_(ss != sizeof(si))) |
fd38203a LP |
1797 | return -EIO; |
1798 | ||
1799 | read_one = true; | |
1800 | ||
0eb2e0e3 | 1801 | s = e->signal_sources[si.ssi_signo]; |
fd38203a LP |
1802 | if (si.ssi_signo == SIGCHLD) { |
1803 | r = process_child(e); | |
1804 | if (r < 0) | |
1805 | return r; | |
0eb2e0e3 | 1806 | if (r > 0 || !s) |
fd38203a | 1807 | continue; |
0eb2e0e3 | 1808 | } else |
fd38203a LP |
1809 | if (!s) |
1810 | return -EIO; | |
fd38203a LP |
1811 | |
1812 | s->signal.siginfo = si; | |
1813 | r = source_set_pending(s, true); | |
1814 | if (r < 0) | |
1815 | return r; | |
1816 | } | |
fd38203a LP |
1817 | } |
1818 | ||
1819 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 1820 | int r = 0; |
fd38203a LP |
1821 | |
1822 | assert(s); | |
6203e07a | 1823 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 1824 | |
6203e07a | 1825 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
1826 | r = source_set_pending(s, false); |
1827 | if (r < 0) | |
1828 | return r; | |
1829 | } | |
fd38203a | 1830 | |
6e9feda3 LP |
1831 | if (s->type != SOURCE_POST) { |
1832 | sd_event_source *z; | |
1833 | Iterator i; | |
1834 | ||
1835 | /* If we execute a non-post source, let's mark all | |
1836 | * post sources as pending */ | |
1837 | ||
1838 | SET_FOREACH(z, s->event->post_sources, i) { | |
1839 | if (z->enabled == SD_EVENT_OFF) | |
1840 | continue; | |
1841 | ||
1842 | r = source_set_pending(z, true); | |
1843 | if (r < 0) | |
1844 | return r; | |
1845 | } | |
1846 | } | |
1847 | ||
baf76283 LP |
1848 | if (s->enabled == SD_EVENT_ONESHOT) { |
1849 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
1850 | if (r < 0) |
1851 | return r; | |
1852 | } | |
1853 | ||
12179984 | 1854 | s->dispatching = true; |
b7484e2a | 1855 | |
fd38203a LP |
1856 | switch (s->type) { |
1857 | ||
1858 | case SOURCE_IO: | |
1859 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
1860 | break; | |
1861 | ||
1862 | case SOURCE_MONOTONIC: | |
1863 | r = s->time.callback(s, s->time.next, s->userdata); | |
1864 | break; | |
1865 | ||
1866 | case SOURCE_REALTIME: | |
1867 | r = s->time.callback(s, s->time.next, s->userdata); | |
1868 | break; | |
1869 | ||
1870 | case SOURCE_SIGNAL: | |
1871 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
1872 | break; | |
1873 | ||
08cd1552 LP |
1874 | case SOURCE_CHILD: { |
1875 | bool zombie; | |
1876 | ||
1877 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
1878 | s->child.siginfo.si_code == CLD_KILLED || | |
1879 | s->child.siginfo.si_code == CLD_DUMPED; | |
1880 | ||
fd38203a | 1881 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
1882 | |
1883 | /* Now, reap the PID for good. */ | |
1884 | if (zombie) | |
1885 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
1886 | ||
fd38203a | 1887 | break; |
08cd1552 | 1888 | } |
fd38203a LP |
1889 | |
1890 | case SOURCE_DEFER: | |
1891 | r = s->defer.callback(s, s->userdata); | |
1892 | break; | |
da7e457c | 1893 | |
6e9feda3 LP |
1894 | case SOURCE_POST: |
1895 | r = s->post.callback(s, s->userdata); | |
1896 | break; | |
1897 | ||
6203e07a LP |
1898 | case SOURCE_EXIT: |
1899 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 1900 | break; |
9d3e3aa5 LP |
1901 | |
1902 | case SOURCE_WATCHDOG: | |
1903 | assert_not_reached("Wut? I shouldn't exist."); | |
fd38203a LP |
1904 | } |
1905 | ||
12179984 LP |
1906 | s->dispatching = false; |
1907 | ||
1908 | if (r < 0) | |
6203e07a | 1909 | log_debug("Event source %p returned error, disabling: %s", s, strerror(-r)); |
12179984 LP |
1910 | |
1911 | if (s->n_ref == 0) | |
1912 | source_free(s); | |
1913 | else if (r < 0) | |
6203e07a | 1914 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 1915 | |
6203e07a | 1916 | return 1; |
fd38203a LP |
1917 | } |
1918 | ||
1919 | static int event_prepare(sd_event *e) { | |
1920 | int r; | |
1921 | ||
1922 | assert(e); | |
1923 | ||
1924 | for (;;) { | |
1925 | sd_event_source *s; | |
1926 | ||
1927 | s = prioq_peek(e->prepare); | |
baf76283 | 1928 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1929 | break; |
1930 | ||
1931 | s->prepare_iteration = e->iteration; | |
1932 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
1933 | if (r < 0) | |
1934 | return r; | |
1935 | ||
1936 | assert(s->prepare); | |
12179984 LP |
1937 | |
1938 | s->dispatching = true; | |
fd38203a | 1939 | r = s->prepare(s, s->userdata); |
12179984 LP |
1940 | s->dispatching = false; |
1941 | ||
fd38203a | 1942 | if (r < 0) |
12179984 | 1943 | log_debug("Prepare callback of event source %p returned error, disabling: %s", s, strerror(-r)); |
fd38203a | 1944 | |
12179984 LP |
1945 | if (s->n_ref == 0) |
1946 | source_free(s); | |
1947 | else if (r < 0) | |
1948 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
1949 | } |
1950 | ||
1951 | return 0; | |
1952 | } | |
1953 | ||
6203e07a | 1954 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
1955 | sd_event_source *p; |
1956 | int r; | |
1957 | ||
1958 | assert(e); | |
1959 | ||
6203e07a | 1960 | p = prioq_peek(e->exit); |
baf76283 | 1961 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
1962 | e->state = SD_EVENT_FINISHED; |
1963 | return 0; | |
1964 | } | |
1965 | ||
1966 | sd_event_ref(e); | |
1967 | e->iteration++; | |
6203e07a | 1968 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
1969 | |
1970 | r = source_dispatch(p); | |
1971 | ||
1972 | e->state = SD_EVENT_PASSIVE; | |
1973 | sd_event_unref(e); | |
1974 | ||
1975 | return r; | |
1976 | } | |
1977 | ||
c2ba3ad6 LP |
1978 | static sd_event_source* event_next_pending(sd_event *e) { |
1979 | sd_event_source *p; | |
1980 | ||
da7e457c LP |
1981 | assert(e); |
1982 | ||
c2ba3ad6 LP |
1983 | p = prioq_peek(e->pending); |
1984 | if (!p) | |
1985 | return NULL; | |
1986 | ||
baf76283 | 1987 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
1988 | return NULL; |
1989 | ||
1990 | return p; | |
1991 | } | |
1992 | ||
cde93897 LP |
1993 | static int arm_watchdog(sd_event *e) { |
1994 | struct itimerspec its = {}; | |
1995 | usec_t t; | |
1996 | int r; | |
1997 | ||
1998 | assert(e); | |
1999 | assert(e->watchdog_fd >= 0); | |
2000 | ||
2001 | t = sleep_between(e, | |
2002 | e->watchdog_last + (e->watchdog_period / 2), | |
2003 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2004 | ||
2005 | timespec_store(&its.it_value, t); | |
2006 | ||
2007 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
2008 | if (r < 0) | |
2009 | return -errno; | |
2010 | ||
2011 | return 0; | |
2012 | } | |
2013 | ||
2014 | static int process_watchdog(sd_event *e) { | |
2015 | assert(e); | |
2016 | ||
2017 | if (!e->watchdog) | |
2018 | return 0; | |
2019 | ||
2020 | /* Don't notify watchdog too often */ | |
2021 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2022 | return 0; | |
2023 | ||
2024 | sd_notify(false, "WATCHDOG=1"); | |
2025 | e->watchdog_last = e->timestamp.monotonic; | |
2026 | ||
2027 | return arm_watchdog(e); | |
2028 | } | |
2029 | ||
f7262a9f | 2030 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
15b38f93 LP |
2031 | struct epoll_event *ev_queue; |
2032 | unsigned ev_queue_max; | |
fd38203a | 2033 | sd_event_source *p; |
305f78bf | 2034 | int r, i, m; |
fd38203a | 2035 | |
da7e457c LP |
2036 | assert_return(e, -EINVAL); |
2037 | assert_return(!event_pid_changed(e), -ECHILD); | |
2038 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2039 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2040 | ||
6203e07a LP |
2041 | if (e->exit_requested) |
2042 | return dispatch_exit(e); | |
fd38203a | 2043 | |
da7e457c | 2044 | sd_event_ref(e); |
fd38203a | 2045 | e->iteration++; |
da7e457c | 2046 | e->state = SD_EVENT_RUNNING; |
fd38203a LP |
2047 | |
2048 | r = event_prepare(e); | |
2049 | if (r < 0) | |
da7e457c | 2050 | goto finish; |
fd38203a | 2051 | |
1b5995b0 LP |
2052 | r = event_arm_timer(e, e->monotonic_fd, e->monotonic_earliest, e->monotonic_latest, &e->monotonic_next); |
2053 | if (r < 0) | |
2054 | goto finish; | |
fd38203a | 2055 | |
1b5995b0 LP |
2056 | r = event_arm_timer(e, e->realtime_fd, e->realtime_earliest, e->realtime_latest, &e->realtime_next); |
2057 | if (r < 0) | |
2058 | goto finish; | |
fd38203a | 2059 | |
1b5995b0 LP |
2060 | if (event_next_pending(e) || e->need_process_child) |
2061 | timeout = 0; | |
15b38f93 LP |
2062 | ev_queue_max = CLAMP(e->n_sources, 1U, EPOLL_QUEUE_MAX); |
2063 | ev_queue = newa(struct epoll_event, ev_queue_max); | |
fd38203a | 2064 | |
15b38f93 | 2065 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2066 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2067 | if (m < 0) { |
ff003106 | 2068 | r = errno == EAGAIN || errno == EINTR ? 1 : -errno; |
da7e457c LP |
2069 | goto finish; |
2070 | } | |
fd38203a | 2071 | |
46e8c825 | 2072 | dual_timestamp_get(&e->timestamp); |
fd38203a LP |
2073 | |
2074 | for (i = 0; i < m; i++) { | |
2075 | ||
2076 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_MONOTONIC)) | |
72aedc1e | 2077 | r = flush_timer(e, e->monotonic_fd, ev_queue[i].events, &e->monotonic_next); |
fd38203a | 2078 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_REALTIME)) |
72aedc1e | 2079 | r = flush_timer(e, e->realtime_fd, ev_queue[i].events, &e->realtime_next); |
fd38203a LP |
2080 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) |
2081 | r = process_signal(e, ev_queue[i].events); | |
cde93897 LP |
2082 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
2083 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); | |
fd38203a LP |
2084 | else |
2085 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2086 | ||
2087 | if (r < 0) | |
da7e457c | 2088 | goto finish; |
fd38203a LP |
2089 | } |
2090 | ||
cde93897 LP |
2091 | r = process_watchdog(e); |
2092 | if (r < 0) | |
2093 | goto finish; | |
2094 | ||
46e8c825 | 2095 | r = process_timer(e, e->timestamp.monotonic, e->monotonic_earliest, e->monotonic_latest); |
fd38203a | 2096 | if (r < 0) |
da7e457c | 2097 | goto finish; |
fd38203a | 2098 | |
46e8c825 | 2099 | r = process_timer(e, e->timestamp.realtime, e->realtime_earliest, e->realtime_latest); |
fd38203a | 2100 | if (r < 0) |
da7e457c | 2101 | goto finish; |
fd38203a | 2102 | |
c2ba3ad6 | 2103 | if (e->need_process_child) { |
fd38203a LP |
2104 | r = process_child(e); |
2105 | if (r < 0) | |
da7e457c | 2106 | goto finish; |
fd38203a LP |
2107 | } |
2108 | ||
c2ba3ad6 | 2109 | p = event_next_pending(e); |
da7e457c | 2110 | if (!p) { |
f98a58fe | 2111 | r = 1; |
da7e457c LP |
2112 | goto finish; |
2113 | } | |
2114 | ||
2115 | r = source_dispatch(p); | |
fd38203a | 2116 | |
da7e457c LP |
2117 | finish: |
2118 | e->state = SD_EVENT_PASSIVE; | |
2119 | sd_event_unref(e); | |
2120 | ||
2121 | return r; | |
fd38203a LP |
2122 | } |
2123 | ||
f7262a9f | 2124 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2125 | int r; |
2126 | ||
da7e457c LP |
2127 | assert_return(e, -EINVAL); |
2128 | assert_return(!event_pid_changed(e), -ECHILD); | |
2129 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2130 | ||
2131 | sd_event_ref(e); | |
fd38203a | 2132 | |
da7e457c | 2133 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2134 | r = sd_event_run(e, (uint64_t) -1); |
2135 | if (r < 0) | |
da7e457c | 2136 | goto finish; |
fd38203a LP |
2137 | } |
2138 | ||
6203e07a | 2139 | r = e->exit_code; |
da7e457c LP |
2140 | |
2141 | finish: | |
2142 | sd_event_unref(e); | |
2143 | return r; | |
fd38203a LP |
2144 | } |
2145 | ||
f7262a9f | 2146 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2147 | assert_return(e, -EINVAL); |
2148 | assert_return(!event_pid_changed(e), -ECHILD); | |
2149 | ||
2150 | return e->state; | |
2151 | } | |
2152 | ||
6203e07a | 2153 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2154 | assert_return(e, -EINVAL); |
6203e07a | 2155 | assert_return(code, -EINVAL); |
da7e457c | 2156 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2157 | |
6203e07a LP |
2158 | if (!e->exit_requested) |
2159 | return -ENODATA; | |
2160 | ||
2161 | *code = e->exit_code; | |
2162 | return 0; | |
fd38203a LP |
2163 | } |
2164 | ||
6203e07a | 2165 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2166 | assert_return(e, -EINVAL); |
2167 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2168 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2169 | |
6203e07a LP |
2170 | e->exit_requested = true; |
2171 | e->exit_code = code; | |
2172 | ||
fd38203a LP |
2173 | return 0; |
2174 | } | |
46e8c825 | 2175 | |
f7262a9f | 2176 | _public_ int sd_event_get_now_realtime(sd_event *e, uint64_t *usec) { |
46e8c825 LP |
2177 | assert_return(e, -EINVAL); |
2178 | assert_return(usec, -EINVAL); | |
2179 | assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA); | |
2180 | assert_return(!event_pid_changed(e), -ECHILD); | |
2181 | ||
2182 | *usec = e->timestamp.realtime; | |
2183 | return 0; | |
2184 | } | |
2185 | ||
f7262a9f | 2186 | _public_ int sd_event_get_now_monotonic(sd_event *e, uint64_t *usec) { |
46e8c825 LP |
2187 | assert_return(e, -EINVAL); |
2188 | assert_return(usec, -EINVAL); | |
2189 | assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA); | |
2190 | assert_return(!event_pid_changed(e), -ECHILD); | |
2191 | ||
2192 | *usec = e->timestamp.monotonic; | |
2193 | return 0; | |
2194 | } | |
afc6adb5 LP |
2195 | |
2196 | _public_ int sd_event_default(sd_event **ret) { | |
2197 | ||
ec202eae | 2198 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2199 | sd_event *e = NULL; |
afc6adb5 LP |
2200 | int r; |
2201 | ||
2202 | if (!ret) | |
2203 | return !!default_event; | |
2204 | ||
2205 | if (default_event) { | |
2206 | *ret = sd_event_ref(default_event); | |
2207 | return 0; | |
2208 | } | |
2209 | ||
2210 | r = sd_event_new(&e); | |
2211 | if (r < 0) | |
2212 | return r; | |
2213 | ||
2214 | e->default_event_ptr = &default_event; | |
2215 | e->tid = gettid(); | |
2216 | default_event = e; | |
2217 | ||
2218 | *ret = e; | |
2219 | return 1; | |
2220 | } | |
2221 | ||
2222 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2223 | assert_return(e, -EINVAL); | |
2224 | assert_return(tid, -EINVAL); | |
76b54375 | 2225 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2226 | |
76b54375 LP |
2227 | if (e->tid != 0) { |
2228 | *tid = e->tid; | |
2229 | return 0; | |
2230 | } | |
2231 | ||
2232 | return -ENXIO; | |
afc6adb5 | 2233 | } |
cde93897 LP |
2234 | |
2235 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2236 | int r; | |
2237 | ||
2238 | assert_return(e, -EINVAL); | |
8f726607 | 2239 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2240 | |
2241 | if (e->watchdog == !!b) | |
2242 | return e->watchdog; | |
2243 | ||
2244 | if (b) { | |
2245 | struct epoll_event ev = {}; | |
cde93897 | 2246 | |
09812eb7 LP |
2247 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2248 | if (r <= 0) | |
cde93897 | 2249 | return r; |
cde93897 LP |
2250 | |
2251 | /* Issue first ping immediately */ | |
2252 | sd_notify(false, "WATCHDOG=1"); | |
2253 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2254 | ||
2255 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2256 | if (e->watchdog_fd < 0) | |
2257 | return -errno; | |
2258 | ||
2259 | r = arm_watchdog(e); | |
2260 | if (r < 0) | |
2261 | goto fail; | |
2262 | ||
2263 | ev.events = EPOLLIN; | |
2264 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2265 | ||
2266 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2267 | if (r < 0) { | |
2268 | r = -errno; | |
2269 | goto fail; | |
2270 | } | |
2271 | ||
2272 | } else { | |
2273 | if (e->watchdog_fd >= 0) { | |
2274 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
2275 | close_nointr_nofail(e->watchdog_fd); | |
2276 | e->watchdog_fd = -1; | |
2277 | } | |
2278 | } | |
2279 | ||
2280 | e->watchdog = !!b; | |
2281 | return e->watchdog; | |
2282 | ||
2283 | fail: | |
2284 | close_nointr_nofail(e->watchdog_fd); | |
2285 | e->watchdog_fd = -1; | |
2286 | return r; | |
2287 | } | |
8f726607 LP |
2288 | |
2289 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2290 | assert_return(e, -EINVAL); | |
2291 | assert_return(!event_pid_changed(e), -ECHILD); | |
2292 | ||
2293 | return e->watchdog; | |
2294 | } |