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fd38203a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/epoll.h> | |
23 | #include <sys/timerfd.h> | |
24 | #include <sys/wait.h> | |
25 | ||
26 | #include "macro.h" | |
fd38203a LP |
27 | #include "prioq.h" |
28 | #include "hashmap.h" | |
29 | #include "util.h" | |
30 | #include "time-util.h" | |
c2ba3ad6 | 31 | #include "sd-id128.h" |
fd38203a LP |
32 | |
33 | #include "sd-event.h" | |
34 | ||
35 | #define EPOLL_QUEUE_MAX 64 | |
c2ba3ad6 | 36 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
37 | |
38 | typedef enum EventSourceType { | |
39 | SOURCE_IO, | |
40 | SOURCE_MONOTONIC, | |
41 | SOURCE_REALTIME, | |
42 | SOURCE_SIGNAL, | |
43 | SOURCE_CHILD, | |
da7e457c LP |
44 | SOURCE_DEFER, |
45 | SOURCE_QUIT | |
fd38203a LP |
46 | } EventSourceType; |
47 | ||
48 | struct sd_event_source { | |
da7e457c | 49 | unsigned n_ref; |
fd38203a LP |
50 | |
51 | sd_event *event; | |
52 | void *userdata; | |
53 | sd_prepare_handler_t prepare; | |
54 | ||
55 | EventSourceType type:4; | |
baf76283 | 56 | int enabled:3; |
fd38203a LP |
57 | bool pending:1; |
58 | ||
59 | int priority; | |
60 | unsigned pending_index; | |
61 | unsigned prepare_index; | |
62 | unsigned pending_iteration; | |
63 | unsigned prepare_iteration; | |
64 | ||
65 | union { | |
66 | struct { | |
67 | sd_io_handler_t callback; | |
68 | int fd; | |
69 | uint32_t events; | |
70 | uint32_t revents; | |
71 | bool registered:1; | |
72 | } io; | |
73 | struct { | |
74 | sd_time_handler_t callback; | |
c2ba3ad6 LP |
75 | usec_t next, accuracy; |
76 | unsigned earliest_index; | |
77 | unsigned latest_index; | |
fd38203a LP |
78 | } time; |
79 | struct { | |
80 | sd_signal_handler_t callback; | |
81 | struct signalfd_siginfo siginfo; | |
82 | int sig; | |
83 | } signal; | |
84 | struct { | |
85 | sd_child_handler_t callback; | |
86 | siginfo_t siginfo; | |
87 | pid_t pid; | |
88 | int options; | |
89 | } child; | |
90 | struct { | |
91 | sd_defer_handler_t callback; | |
92 | } defer; | |
da7e457c LP |
93 | struct { |
94 | sd_quit_handler_t callback; | |
95 | unsigned prioq_index; | |
96 | } quit; | |
fd38203a LP |
97 | }; |
98 | }; | |
99 | ||
100 | struct sd_event { | |
da7e457c | 101 | unsigned n_ref; |
fd38203a LP |
102 | |
103 | int epoll_fd; | |
104 | int signal_fd; | |
105 | int realtime_fd; | |
106 | int monotonic_fd; | |
107 | ||
108 | Prioq *pending; | |
109 | Prioq *prepare; | |
c2ba3ad6 LP |
110 | |
111 | /* For both clocks we maintain two priority queues each, one | |
112 | * ordered for the earliest times the events may be | |
113 | * dispatched, and one ordered by the latest times they must | |
114 | * have been dispatched. The range between the top entries in | |
115 | * the two prioqs is the time window we can freely schedule | |
116 | * wakeups in */ | |
117 | Prioq *monotonic_earliest; | |
118 | Prioq *monotonic_latest; | |
119 | Prioq *realtime_earliest; | |
120 | Prioq *realtime_latest; | |
fd38203a | 121 | |
da7e457c LP |
122 | usec_t realtime_next, monotonic_next; |
123 | usec_t perturb; | |
124 | ||
fd38203a LP |
125 | sigset_t sigset; |
126 | sd_event_source **signal_sources; | |
127 | ||
128 | Hashmap *child_sources; | |
baf76283 | 129 | unsigned n_enabled_child_sources; |
fd38203a | 130 | |
da7e457c | 131 | Prioq *quit; |
fd38203a | 132 | |
da7e457c | 133 | pid_t original_pid; |
c2ba3ad6 | 134 | |
da7e457c | 135 | unsigned iteration; |
46e8c825 | 136 | dual_timestamp timestamp; |
da7e457c | 137 | int state; |
eaa3cbef | 138 | |
da7e457c LP |
139 | bool quit_requested:1; |
140 | bool need_process_child:1; | |
fd38203a LP |
141 | }; |
142 | ||
143 | static int pending_prioq_compare(const void *a, const void *b) { | |
144 | const sd_event_source *x = a, *y = b; | |
145 | ||
146 | assert(x->pending); | |
147 | assert(y->pending); | |
148 | ||
baf76283 LP |
149 | /* Enabled ones first */ |
150 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 151 | return -1; |
baf76283 | 152 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
153 | return 1; |
154 | ||
155 | /* Lower priority values first */ | |
156 | if (x->priority < y->priority) | |
157 | return -1; | |
158 | if (x->priority > y->priority) | |
159 | return 1; | |
160 | ||
161 | /* Older entries first */ | |
162 | if (x->pending_iteration < y->pending_iteration) | |
163 | return -1; | |
164 | if (x->pending_iteration > y->pending_iteration) | |
165 | return 1; | |
166 | ||
167 | /* Stability for the rest */ | |
168 | if (x < y) | |
169 | return -1; | |
dfcd88f6 | 170 | if (x > y) |
fd38203a LP |
171 | return 1; |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | static int prepare_prioq_compare(const void *a, const void *b) { | |
177 | const sd_event_source *x = a, *y = b; | |
178 | ||
179 | assert(x->prepare); | |
180 | assert(y->prepare); | |
181 | ||
182 | /* Move most recently prepared ones last, so that we can stop | |
183 | * preparing as soon as we hit one that has already been | |
184 | * prepared in the current iteration */ | |
185 | if (x->prepare_iteration < y->prepare_iteration) | |
186 | return -1; | |
187 | if (x->prepare_iteration > y->prepare_iteration) | |
188 | return 1; | |
189 | ||
baf76283 LP |
190 | /* Enabled ones first */ |
191 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 192 | return -1; |
baf76283 | 193 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
194 | return 1; |
195 | ||
196 | /* Lower priority values first */ | |
197 | if (x->priority < y->priority) | |
198 | return -1; | |
199 | if (x->priority > y->priority) | |
200 | return 1; | |
201 | ||
202 | /* Stability for the rest */ | |
203 | if (x < y) | |
204 | return -1; | |
dfcd88f6 | 205 | if (x > y) |
fd38203a LP |
206 | return 1; |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
c2ba3ad6 | 211 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
212 | const sd_event_source *x = a, *y = b; |
213 | ||
214 | assert(x->type == SOURCE_MONOTONIC || x->type == SOURCE_REALTIME); | |
215 | assert(y->type == SOURCE_MONOTONIC || y->type == SOURCE_REALTIME); | |
216 | ||
baf76283 LP |
217 | /* Enabled ones first */ |
218 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 219 | return -1; |
baf76283 | 220 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
221 | return 1; |
222 | ||
223 | /* Move the pending ones to the end */ | |
224 | if (!x->pending && y->pending) | |
225 | return -1; | |
226 | if (x->pending && !y->pending) | |
227 | return 1; | |
228 | ||
229 | /* Order by time */ | |
230 | if (x->time.next < y->time.next) | |
231 | return -1; | |
232 | if (x->time.next > y->time.next) | |
233 | return -1; | |
234 | ||
235 | /* Stability for the rest */ | |
236 | if (x < y) | |
237 | return -1; | |
dfcd88f6 | 238 | if (x > y) |
fd38203a LP |
239 | return 1; |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
c2ba3ad6 LP |
244 | static int latest_time_prioq_compare(const void *a, const void *b) { |
245 | const sd_event_source *x = a, *y = b; | |
246 | ||
da7e457c LP |
247 | assert((x->type == SOURCE_MONOTONIC && y->type == SOURCE_MONOTONIC) || |
248 | (x->type == SOURCE_REALTIME && y->type == SOURCE_REALTIME)); | |
c2ba3ad6 | 249 | |
baf76283 LP |
250 | /* Enabled ones first */ |
251 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 252 | return -1; |
baf76283 | 253 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
254 | return 1; |
255 | ||
256 | /* Move the pending ones to the end */ | |
257 | if (!x->pending && y->pending) | |
258 | return -1; | |
259 | if (x->pending && !y->pending) | |
260 | return 1; | |
261 | ||
262 | /* Order by time */ | |
263 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
264 | return -1; | |
265 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
266 | return -1; | |
267 | ||
268 | /* Stability for the rest */ | |
269 | if (x < y) | |
270 | return -1; | |
271 | if (x > y) | |
272 | return 1; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
da7e457c LP |
277 | static int quit_prioq_compare(const void *a, const void *b) { |
278 | const sd_event_source *x = a, *y = b; | |
279 | ||
280 | assert(x->type == SOURCE_QUIT); | |
281 | assert(y->type == SOURCE_QUIT); | |
282 | ||
baf76283 LP |
283 | /* Enabled ones first */ |
284 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 285 | return -1; |
baf76283 | 286 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
287 | return 1; |
288 | ||
289 | /* Lower priority values first */ | |
290 | if (x->priority < y->priority) | |
291 | return -1; | |
292 | if (x->priority > y->priority) | |
293 | return 1; | |
294 | ||
295 | /* Stability for the rest */ | |
296 | if (x < y) | |
297 | return -1; | |
298 | if (x > y) | |
299 | return 1; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
fd38203a LP |
304 | static void event_free(sd_event *e) { |
305 | assert(e); | |
306 | ||
307 | if (e->epoll_fd >= 0) | |
308 | close_nointr_nofail(e->epoll_fd); | |
309 | ||
310 | if (e->signal_fd >= 0) | |
311 | close_nointr_nofail(e->signal_fd); | |
312 | ||
313 | if (e->realtime_fd >= 0) | |
314 | close_nointr_nofail(e->realtime_fd); | |
315 | ||
316 | if (e->monotonic_fd >= 0) | |
317 | close_nointr_nofail(e->monotonic_fd); | |
318 | ||
319 | prioq_free(e->pending); | |
320 | prioq_free(e->prepare); | |
c2ba3ad6 LP |
321 | prioq_free(e->monotonic_earliest); |
322 | prioq_free(e->monotonic_latest); | |
323 | prioq_free(e->realtime_earliest); | |
324 | prioq_free(e->realtime_latest); | |
da7e457c | 325 | prioq_free(e->quit); |
fd38203a LP |
326 | |
327 | free(e->signal_sources); | |
328 | ||
329 | hashmap_free(e->child_sources); | |
330 | free(e); | |
331 | } | |
332 | ||
f7262a9f | 333 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
334 | sd_event *e; |
335 | int r; | |
336 | ||
305f78bf | 337 | assert_return(ret, -EINVAL); |
fd38203a LP |
338 | |
339 | e = new0(sd_event, 1); | |
340 | if (!e) | |
341 | return -ENOMEM; | |
342 | ||
da7e457c | 343 | e->n_ref = 1; |
fd38203a LP |
344 | e->signal_fd = e->realtime_fd = e->monotonic_fd = e->epoll_fd = -1; |
345 | e->realtime_next = e->monotonic_next = (usec_t) -1; | |
eaa3cbef | 346 | e->original_pid = getpid(); |
fd38203a LP |
347 | |
348 | assert_se(sigemptyset(&e->sigset) == 0); | |
349 | ||
350 | e->pending = prioq_new(pending_prioq_compare); | |
351 | if (!e->pending) { | |
352 | r = -ENOMEM; | |
353 | goto fail; | |
354 | } | |
355 | ||
356 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
357 | if (e->epoll_fd < 0) { | |
358 | r = -errno; | |
359 | goto fail; | |
360 | } | |
361 | ||
362 | *ret = e; | |
363 | return 0; | |
364 | ||
365 | fail: | |
366 | event_free(e); | |
367 | return r; | |
368 | } | |
369 | ||
f7262a9f | 370 | _public_ sd_event* sd_event_ref(sd_event *e) { |
305f78bf | 371 | assert_return(e, NULL); |
fd38203a | 372 | |
da7e457c LP |
373 | assert(e->n_ref >= 1); |
374 | e->n_ref++; | |
fd38203a LP |
375 | |
376 | return e; | |
377 | } | |
378 | ||
f7262a9f | 379 | _public_ sd_event* sd_event_unref(sd_event *e) { |
305f78bf | 380 | assert_return(e, NULL); |
fd38203a | 381 | |
da7e457c LP |
382 | assert(e->n_ref >= 1); |
383 | e->n_ref--; | |
384 | ||
385 | if (e->n_ref <= 0) | |
fd38203a LP |
386 | event_free(e); |
387 | ||
388 | return NULL; | |
389 | } | |
390 | ||
eaa3cbef LP |
391 | static bool event_pid_changed(sd_event *e) { |
392 | assert(e); | |
393 | ||
394 | /* We don't support people creating am event loop and keeping | |
395 | * it around over a fork(). Let's complain. */ | |
396 | ||
397 | return e->original_pid != getpid(); | |
398 | } | |
399 | ||
fd38203a LP |
400 | static int source_io_unregister(sd_event_source *s) { |
401 | int r; | |
402 | ||
403 | assert(s); | |
404 | assert(s->type == SOURCE_IO); | |
405 | ||
406 | if (!s->io.registered) | |
407 | return 0; | |
408 | ||
409 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
410 | if (r < 0) | |
411 | return -errno; | |
412 | ||
413 | s->io.registered = false; | |
414 | return 0; | |
415 | } | |
416 | ||
305f78bf LP |
417 | static int source_io_register( |
418 | sd_event_source *s, | |
419 | int enabled, | |
420 | uint32_t events) { | |
421 | ||
fd38203a LP |
422 | struct epoll_event ev = {}; |
423 | int r; | |
424 | ||
425 | assert(s); | |
426 | assert(s->type == SOURCE_IO); | |
baf76283 | 427 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
428 | |
429 | ev.events = events; | |
430 | ev.data.ptr = s; | |
431 | ||
baf76283 | 432 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
433 | ev.events |= EPOLLONESHOT; |
434 | ||
435 | if (s->io.registered) | |
436 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
437 | else | |
438 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
439 | ||
440 | if (r < 0) | |
441 | return -errno; | |
442 | ||
443 | s->io.registered = true; | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | static void source_free(sd_event_source *s) { | |
449 | assert(s); | |
450 | ||
451 | if (s->event) { | |
452 | switch (s->type) { | |
453 | ||
454 | case SOURCE_IO: | |
455 | if (s->io.fd >= 0) | |
456 | source_io_unregister(s); | |
457 | ||
458 | break; | |
459 | ||
460 | case SOURCE_MONOTONIC: | |
c2ba3ad6 LP |
461 | prioq_remove(s->event->monotonic_earliest, s, &s->time.earliest_index); |
462 | prioq_remove(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
463 | break; |
464 | ||
465 | case SOURCE_REALTIME: | |
c2ba3ad6 LP |
466 | prioq_remove(s->event->realtime_earliest, s, &s->time.earliest_index); |
467 | prioq_remove(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
468 | break; |
469 | ||
470 | case SOURCE_SIGNAL: | |
471 | if (s->signal.sig > 0) { | |
baf76283 | 472 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) |
fd38203a LP |
473 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
474 | ||
475 | if (s->event->signal_sources) | |
476 | s->event->signal_sources[s->signal.sig] = NULL; | |
477 | } | |
478 | ||
479 | break; | |
480 | ||
481 | case SOURCE_CHILD: | |
482 | if (s->child.pid > 0) { | |
baf76283 LP |
483 | if (s->enabled != SD_EVENT_OFF) { |
484 | assert(s->event->n_enabled_child_sources > 0); | |
485 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
486 | } |
487 | ||
488 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) | |
489 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
490 | ||
491 | hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid)); | |
492 | } | |
493 | ||
494 | break; | |
da7e457c | 495 | |
0eb2e0e3 ZJS |
496 | case SOURCE_DEFER: |
497 | /* nothing */ | |
498 | break; | |
499 | ||
da7e457c LP |
500 | case SOURCE_QUIT: |
501 | prioq_remove(s->event->quit, s, &s->quit.prioq_index); | |
502 | break; | |
fd38203a LP |
503 | } |
504 | ||
505 | if (s->pending) | |
506 | prioq_remove(s->event->pending, s, &s->pending_index); | |
507 | ||
508 | if (s->prepare) | |
509 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
510 | ||
511 | sd_event_unref(s->event); | |
512 | } | |
513 | ||
514 | free(s); | |
515 | } | |
516 | ||
517 | static int source_set_pending(sd_event_source *s, bool b) { | |
518 | int r; | |
519 | ||
520 | assert(s); | |
da7e457c | 521 | assert(s->type != SOURCE_QUIT); |
fd38203a LP |
522 | |
523 | if (s->pending == b) | |
524 | return 0; | |
525 | ||
526 | s->pending = b; | |
527 | ||
528 | if (b) { | |
529 | s->pending_iteration = s->event->iteration; | |
530 | ||
531 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
532 | if (r < 0) { | |
533 | s->pending = false; | |
534 | return r; | |
535 | } | |
536 | } else | |
537 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
542 | static sd_event_source *source_new(sd_event *e, EventSourceType type) { | |
543 | sd_event_source *s; | |
544 | ||
545 | assert(e); | |
546 | ||
547 | s = new0(sd_event_source, 1); | |
548 | if (!s) | |
549 | return NULL; | |
550 | ||
da7e457c | 551 | s->n_ref = 1; |
fd38203a LP |
552 | s->event = sd_event_ref(e); |
553 | s->type = type; | |
fd38203a LP |
554 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
555 | ||
556 | return s; | |
557 | } | |
558 | ||
f7262a9f | 559 | _public_ int sd_event_add_io( |
fd38203a LP |
560 | sd_event *e, |
561 | int fd, | |
562 | uint32_t events, | |
563 | sd_io_handler_t callback, | |
564 | void *userdata, | |
565 | sd_event_source **ret) { | |
566 | ||
567 | sd_event_source *s; | |
568 | int r; | |
569 | ||
305f78bf LP |
570 | assert_return(e, -EINVAL); |
571 | assert_return(fd >= 0, -EINVAL); | |
572 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP)), -EINVAL); | |
573 | assert_return(callback, -EINVAL); | |
574 | assert_return(ret, -EINVAL); | |
da7e457c | 575 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 576 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
577 | |
578 | s = source_new(e, SOURCE_IO); | |
579 | if (!s) | |
580 | return -ENOMEM; | |
581 | ||
582 | s->io.fd = fd; | |
583 | s->io.events = events; | |
584 | s->io.callback = callback; | |
585 | s->userdata = userdata; | |
baf76283 | 586 | s->enabled = SD_EVENT_ON; |
fd38203a | 587 | |
baf76283 | 588 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
589 | if (r < 0) { |
590 | source_free(s); | |
591 | return -errno; | |
592 | } | |
593 | ||
594 | *ret = s; | |
595 | return 0; | |
596 | } | |
597 | ||
598 | static int event_setup_timer_fd( | |
599 | sd_event *e, | |
600 | EventSourceType type, | |
601 | int *timer_fd, | |
602 | clockid_t id) { | |
603 | ||
604 | struct epoll_event ev = {}; | |
605 | int r, fd; | |
c2ba3ad6 | 606 | sd_id128_t bootid; |
fd38203a LP |
607 | |
608 | assert(e); | |
609 | assert(timer_fd); | |
610 | ||
611 | if (_likely_(*timer_fd >= 0)) | |
612 | return 0; | |
613 | ||
614 | fd = timerfd_create(id, TFD_NONBLOCK|TFD_CLOEXEC); | |
615 | if (fd < 0) | |
616 | return -errno; | |
617 | ||
618 | ev.events = EPOLLIN; | |
619 | ev.data.ptr = INT_TO_PTR(type); | |
620 | ||
621 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
622 | if (r < 0) { | |
623 | close_nointr_nofail(fd); | |
624 | return -errno; | |
625 | } | |
626 | ||
c2ba3ad6 LP |
627 | /* When we sleep for longer, we try to realign the wakeup to |
628 | the same time wihtin each second, so that events all across | |
629 | the system can be coalesced into a single CPU | |
630 | wakeup. However, let's take some system-specific randomness | |
631 | for this value, so that in a network of systems with synced | |
632 | clocks timer events are distributed a bit. Here, we | |
633 | calculate a perturbation usec offset from the boot ID. */ | |
634 | ||
635 | if (sd_id128_get_boot(&bootid) >= 0) | |
636 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_SEC; | |
637 | ||
fd38203a LP |
638 | *timer_fd = fd; |
639 | return 0; | |
640 | } | |
641 | ||
642 | static int event_add_time_internal( | |
643 | sd_event *e, | |
644 | EventSourceType type, | |
645 | int *timer_fd, | |
646 | clockid_t id, | |
c2ba3ad6 LP |
647 | Prioq **earliest, |
648 | Prioq **latest, | |
fd38203a | 649 | uint64_t usec, |
c2ba3ad6 | 650 | uint64_t accuracy, |
fd38203a LP |
651 | sd_time_handler_t callback, |
652 | void *userdata, | |
653 | sd_event_source **ret) { | |
654 | ||
655 | sd_event_source *s; | |
656 | int r; | |
657 | ||
305f78bf LP |
658 | assert_return(e, -EINVAL); |
659 | assert_return(callback, -EINVAL); | |
660 | assert_return(ret, -EINVAL); | |
661 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
662 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
da7e457c | 663 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 664 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
665 | |
666 | assert(timer_fd); | |
c2ba3ad6 LP |
667 | assert(earliest); |
668 | assert(latest); | |
669 | ||
670 | if (!*earliest) { | |
671 | *earliest = prioq_new(earliest_time_prioq_compare); | |
672 | if (!*earliest) | |
673 | return -ENOMEM; | |
674 | } | |
fd38203a | 675 | |
c2ba3ad6 LP |
676 | if (!*latest) { |
677 | *latest = prioq_new(latest_time_prioq_compare); | |
678 | if (!*latest) | |
fd38203a LP |
679 | return -ENOMEM; |
680 | } | |
681 | ||
682 | if (*timer_fd < 0) { | |
683 | r = event_setup_timer_fd(e, type, timer_fd, id); | |
684 | if (r < 0) | |
685 | return r; | |
686 | } | |
687 | ||
688 | s = source_new(e, type); | |
689 | if (!s) | |
690 | return -ENOMEM; | |
691 | ||
692 | s->time.next = usec; | |
c2ba3ad6 | 693 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 694 | s->time.callback = callback; |
da7e457c | 695 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 696 | s->userdata = userdata; |
baf76283 | 697 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 698 | |
c2ba3ad6 LP |
699 | r = prioq_put(*earliest, s, &s->time.earliest_index); |
700 | if (r < 0) | |
701 | goto fail; | |
702 | ||
703 | r = prioq_put(*latest, s, &s->time.latest_index); | |
704 | if (r < 0) | |
705 | goto fail; | |
fd38203a LP |
706 | |
707 | *ret = s; | |
708 | return 0; | |
c2ba3ad6 LP |
709 | |
710 | fail: | |
711 | source_free(s); | |
712 | return r; | |
fd38203a LP |
713 | } |
714 | ||
f7262a9f ZJS |
715 | _public_ int sd_event_add_monotonic(sd_event *e, |
716 | uint64_t usec, | |
717 | uint64_t accuracy, | |
718 | sd_time_handler_t callback, | |
719 | void *userdata, | |
720 | sd_event_source **ret) { | |
721 | ||
c2ba3ad6 | 722 | 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 |
723 | } |
724 | ||
f7262a9f ZJS |
725 | _public_ int sd_event_add_realtime(sd_event *e, |
726 | uint64_t usec, | |
727 | uint64_t accuracy, | |
728 | sd_time_handler_t callback, | |
729 | void *userdata, | |
730 | sd_event_source **ret) { | |
731 | ||
c2ba3ad6 | 732 | 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 |
733 | } |
734 | ||
735 | static int event_update_signal_fd(sd_event *e) { | |
736 | struct epoll_event ev = {}; | |
737 | bool add_to_epoll; | |
738 | int r; | |
739 | ||
740 | assert(e); | |
741 | ||
742 | add_to_epoll = e->signal_fd < 0; | |
743 | ||
744 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
745 | if (r < 0) | |
746 | return -errno; | |
747 | ||
748 | e->signal_fd = r; | |
749 | ||
750 | if (!add_to_epoll) | |
751 | return 0; | |
752 | ||
753 | ev.events = EPOLLIN; | |
754 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
755 | ||
756 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
757 | if (r < 0) { | |
758 | close_nointr_nofail(e->signal_fd); | |
759 | e->signal_fd = -1; | |
760 | ||
761 | return -errno; | |
762 | } | |
763 | ||
764 | return 0; | |
765 | } | |
766 | ||
f7262a9f | 767 | _public_ int sd_event_add_signal( |
305f78bf LP |
768 | sd_event *e, |
769 | int sig, | |
770 | sd_signal_handler_t callback, | |
771 | void *userdata, | |
772 | sd_event_source **ret) { | |
773 | ||
fd38203a LP |
774 | sd_event_source *s; |
775 | int r; | |
776 | ||
305f78bf LP |
777 | assert_return(e, -EINVAL); |
778 | assert_return(sig > 0, -EINVAL); | |
779 | assert_return(sig < _NSIG, -EINVAL); | |
780 | assert_return(callback, -EINVAL); | |
781 | assert_return(ret, -EINVAL); | |
da7e457c | 782 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 783 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
784 | |
785 | if (!e->signal_sources) { | |
786 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
787 | if (!e->signal_sources) | |
788 | return -ENOMEM; | |
789 | } else if (e->signal_sources[sig]) | |
790 | return -EBUSY; | |
791 | ||
792 | s = source_new(e, SOURCE_SIGNAL); | |
793 | if (!s) | |
794 | return -ENOMEM; | |
795 | ||
796 | s->signal.sig = sig; | |
797 | s->signal.callback = callback; | |
798 | s->userdata = userdata; | |
baf76283 | 799 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
800 | |
801 | e->signal_sources[sig] = s; | |
802 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
803 | ||
baf76283 | 804 | if (sig != SIGCHLD || e->n_enabled_child_sources == 0) { |
fd38203a LP |
805 | r = event_update_signal_fd(e); |
806 | if (r < 0) { | |
807 | source_free(s); | |
808 | return r; | |
809 | } | |
810 | } | |
811 | ||
812 | *ret = s; | |
813 | return 0; | |
814 | } | |
815 | ||
f7262a9f | 816 | _public_ int sd_event_add_child( |
305f78bf LP |
817 | sd_event *e, |
818 | pid_t pid, | |
819 | int options, | |
820 | sd_child_handler_t callback, | |
821 | void *userdata, | |
822 | sd_event_source **ret) { | |
823 | ||
fd38203a LP |
824 | sd_event_source *s; |
825 | int r; | |
826 | ||
305f78bf LP |
827 | assert_return(e, -EINVAL); |
828 | assert_return(pid > 1, -EINVAL); | |
829 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
830 | assert_return(options != 0, -EINVAL); | |
831 | assert_return(callback, -EINVAL); | |
832 | assert_return(ret, -EINVAL); | |
da7e457c | 833 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 834 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
835 | |
836 | r = hashmap_ensure_allocated(&e->child_sources, trivial_hash_func, trivial_compare_func); | |
837 | if (r < 0) | |
838 | return r; | |
839 | ||
840 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
841 | return -EBUSY; | |
842 | ||
843 | s = source_new(e, SOURCE_CHILD); | |
844 | if (!s) | |
845 | return -ENOMEM; | |
846 | ||
847 | s->child.pid = pid; | |
848 | s->child.options = options; | |
849 | s->child.callback = callback; | |
850 | s->userdata = userdata; | |
baf76283 | 851 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
852 | |
853 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
854 | if (r < 0) { | |
855 | source_free(s); | |
856 | return r; | |
857 | } | |
858 | ||
baf76283 | 859 | e->n_enabled_child_sources ++; |
fd38203a LP |
860 | |
861 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
862 | ||
863 | if (!e->signal_sources || !e->signal_sources[SIGCHLD]) { | |
864 | r = event_update_signal_fd(e); | |
865 | if (r < 0) { | |
866 | source_free(s); | |
867 | return -errno; | |
868 | } | |
869 | } | |
870 | ||
c2ba3ad6 LP |
871 | e->need_process_child = true; |
872 | ||
fd38203a LP |
873 | *ret = s; |
874 | return 0; | |
875 | } | |
876 | ||
f7262a9f | 877 | _public_ int sd_event_add_defer( |
305f78bf LP |
878 | sd_event *e, |
879 | sd_defer_handler_t callback, | |
880 | void *userdata, | |
881 | sd_event_source **ret) { | |
882 | ||
fd38203a LP |
883 | sd_event_source *s; |
884 | int r; | |
885 | ||
305f78bf LP |
886 | assert_return(e, -EINVAL); |
887 | assert_return(callback, -EINVAL); | |
888 | assert_return(ret, -EINVAL); | |
da7e457c | 889 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 890 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
891 | |
892 | s = source_new(e, SOURCE_DEFER); | |
893 | if (!s) | |
894 | return -ENOMEM; | |
895 | ||
896 | s->defer.callback = callback; | |
897 | s->userdata = userdata; | |
baf76283 | 898 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
899 | |
900 | r = source_set_pending(s, true); | |
901 | if (r < 0) { | |
902 | source_free(s); | |
903 | return r; | |
904 | } | |
905 | ||
906 | *ret = s; | |
907 | return 0; | |
908 | } | |
909 | ||
f7262a9f | 910 | _public_ int sd_event_add_quit( |
305f78bf LP |
911 | sd_event *e, |
912 | sd_quit_handler_t callback, | |
913 | void *userdata, | |
914 | sd_event_source **ret) { | |
915 | ||
da7e457c LP |
916 | sd_event_source *s; |
917 | int r; | |
918 | ||
919 | assert_return(e, -EINVAL); | |
920 | assert_return(callback, -EINVAL); | |
305f78bf | 921 | assert_return(ret, -EINVAL); |
da7e457c LP |
922 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
923 | assert_return(!event_pid_changed(e), -ECHILD); | |
924 | ||
925 | if (!e->quit) { | |
926 | e->quit = prioq_new(quit_prioq_compare); | |
927 | if (!e->quit) | |
928 | return -ENOMEM; | |
929 | } | |
930 | ||
931 | s = source_new(e, SOURCE_QUIT); | |
fd38203a | 932 | if (!s) |
da7e457c | 933 | return -ENOMEM; |
fd38203a | 934 | |
da7e457c LP |
935 | s->quit.callback = callback; |
936 | s->userdata = userdata; | |
937 | s->quit.prioq_index = PRIOQ_IDX_NULL; | |
baf76283 | 938 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c LP |
939 | |
940 | r = prioq_put(s->event->quit, s, &s->quit.prioq_index); | |
941 | if (r < 0) { | |
942 | source_free(s); | |
943 | return r; | |
944 | } | |
945 | ||
946 | *ret = s; | |
947 | return 0; | |
948 | } | |
949 | ||
f7262a9f | 950 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
da7e457c LP |
951 | assert_return(s, NULL); |
952 | ||
953 | assert(s->n_ref >= 1); | |
954 | s->n_ref++; | |
fd38203a LP |
955 | |
956 | return s; | |
957 | } | |
958 | ||
f7262a9f | 959 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
da7e457c | 960 | assert_return(s, NULL); |
fd38203a | 961 | |
da7e457c LP |
962 | assert(s->n_ref >= 1); |
963 | s->n_ref--; | |
964 | ||
965 | if (s->n_ref <= 0) | |
fd38203a LP |
966 | source_free(s); |
967 | ||
968 | return NULL; | |
969 | } | |
970 | ||
f7262a9f | 971 | _public_ sd_event *sd_event_get(sd_event_source *s) { |
305f78bf | 972 | assert_return(s, NULL); |
eaa3cbef LP |
973 | |
974 | return s->event; | |
975 | } | |
976 | ||
f7262a9f | 977 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf LP |
978 | assert_return(s, -EINVAL); |
979 | assert_return(s->type != SOURCE_QUIT, -EDOM); | |
da7e457c | 980 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 981 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
982 | |
983 | return s->pending; | |
984 | } | |
985 | ||
f7262a9f | 986 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
987 | assert_return(s, -EINVAL); |
988 | assert_return(s->type == SOURCE_IO, -EDOM); | |
989 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
990 | |
991 | return s->io.fd; | |
992 | } | |
993 | ||
f7262a9f | 994 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
995 | assert_return(s, -EINVAL); |
996 | assert_return(events, -EINVAL); | |
997 | assert_return(s->type == SOURCE_IO, -EDOM); | |
998 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
999 | |
1000 | *events = s->io.events; | |
1001 | return 0; | |
1002 | } | |
1003 | ||
f7262a9f | 1004 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1005 | int r; |
1006 | ||
305f78bf LP |
1007 | assert_return(s, -EINVAL); |
1008 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1009 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP)), -EINVAL); | |
da7e457c | 1010 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1011 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1012 | |
1013 | if (s->io.events == events) | |
1014 | return 0; | |
1015 | ||
baf76283 | 1016 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1017 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1018 | if (r < 0) |
1019 | return r; | |
1020 | } | |
1021 | ||
1022 | s->io.events = events; | |
1023 | ||
1024 | return 0; | |
1025 | } | |
1026 | ||
f7262a9f | 1027 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1028 | assert_return(s, -EINVAL); |
1029 | assert_return(revents, -EINVAL); | |
1030 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1031 | assert_return(s->pending, -ENODATA); | |
1032 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1033 | |
1034 | *revents = s->io.revents; | |
1035 | return 0; | |
1036 | } | |
1037 | ||
f7262a9f | 1038 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1039 | assert_return(s, -EINVAL); |
1040 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1041 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1042 | |
1043 | return s->signal.sig; | |
1044 | } | |
1045 | ||
f7262a9f | 1046 | _public_ int sd_event_source_get_priority(sd_event_source *s, int *priority) { |
305f78bf LP |
1047 | assert_return(s, -EINVAL); |
1048 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1049 | |
1050 | return s->priority; | |
1051 | } | |
1052 | ||
f7262a9f | 1053 | _public_ int sd_event_source_set_priority(sd_event_source *s, int priority) { |
305f78bf | 1054 | assert_return(s, -EINVAL); |
da7e457c | 1055 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1056 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1057 | |
1058 | if (s->priority == priority) | |
1059 | return 0; | |
1060 | ||
1061 | s->priority = priority; | |
1062 | ||
1063 | if (s->pending) | |
c2ba3ad6 | 1064 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1065 | |
1066 | if (s->prepare) | |
c2ba3ad6 | 1067 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1068 | |
305f78bf LP |
1069 | if (s->type == SOURCE_QUIT) |
1070 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1071 | ||
fd38203a LP |
1072 | return 0; |
1073 | } | |
1074 | ||
f7262a9f | 1075 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1076 | assert_return(s, -EINVAL); |
1077 | assert_return(m, -EINVAL); | |
1078 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1079 | |
baf76283 | 1080 | *m = s->enabled; |
fd38203a LP |
1081 | return 0; |
1082 | } | |
1083 | ||
f7262a9f | 1084 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1085 | int r; |
1086 | ||
305f78bf LP |
1087 | assert_return(s, -EINVAL); |
1088 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
da7e457c | 1089 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1090 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1091 | |
baf76283 | 1092 | if (s->enabled == m) |
fd38203a LP |
1093 | return 0; |
1094 | ||
baf76283 | 1095 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1096 | |
1097 | switch (s->type) { | |
1098 | ||
1099 | case SOURCE_IO: | |
1100 | r = source_io_unregister(s); | |
1101 | if (r < 0) | |
1102 | return r; | |
1103 | ||
baf76283 | 1104 | s->enabled = m; |
fd38203a LP |
1105 | break; |
1106 | ||
1107 | case SOURCE_MONOTONIC: | |
baf76283 | 1108 | s->enabled = m; |
c2ba3ad6 LP |
1109 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); |
1110 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
1111 | break; |
1112 | ||
1113 | case SOURCE_REALTIME: | |
baf76283 | 1114 | s->enabled = m; |
c2ba3ad6 LP |
1115 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); |
1116 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
1117 | break; |
1118 | ||
1119 | case SOURCE_SIGNAL: | |
baf76283 LP |
1120 | s->enabled = m; |
1121 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { | |
fd38203a LP |
1122 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
1123 | event_update_signal_fd(s->event); | |
1124 | } | |
1125 | ||
1126 | break; | |
1127 | ||
1128 | case SOURCE_CHILD: | |
baf76283 | 1129 | s->enabled = m; |
fd38203a | 1130 | |
baf76283 LP |
1131 | assert(s->event->n_enabled_child_sources > 0); |
1132 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
1133 | |
1134 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1135 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
1136 | event_update_signal_fd(s->event); | |
1137 | } | |
1138 | ||
1139 | break; | |
1140 | ||
da7e457c | 1141 | case SOURCE_QUIT: |
305f78bf LP |
1142 | s->enabled = m; |
1143 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1144 | break; | |
1145 | ||
1146 | case SOURCE_DEFER: | |
baf76283 | 1147 | s->enabled = m; |
fd38203a LP |
1148 | break; |
1149 | } | |
1150 | ||
1151 | } else { | |
1152 | switch (s->type) { | |
1153 | ||
1154 | case SOURCE_IO: | |
1155 | r = source_io_register(s, m, s->io.events); | |
1156 | if (r < 0) | |
1157 | return r; | |
1158 | ||
baf76283 | 1159 | s->enabled = m; |
fd38203a LP |
1160 | break; |
1161 | ||
1162 | case SOURCE_MONOTONIC: | |
baf76283 | 1163 | s->enabled = m; |
c2ba3ad6 LP |
1164 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); |
1165 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
1166 | break; |
1167 | ||
1168 | case SOURCE_REALTIME: | |
baf76283 | 1169 | s->enabled = m; |
c2ba3ad6 LP |
1170 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); |
1171 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
1172 | break; |
1173 | ||
1174 | case SOURCE_SIGNAL: | |
baf76283 | 1175 | s->enabled = m; |
fd38203a | 1176 | |
baf76283 | 1177 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { |
fd38203a LP |
1178 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
1179 | event_update_signal_fd(s->event); | |
1180 | } | |
1181 | break; | |
1182 | ||
1183 | case SOURCE_CHILD: | |
baf76283 | 1184 | s->enabled = m; |
fd38203a | 1185 | |
baf76283 LP |
1186 | if (s->enabled == SD_EVENT_OFF) { |
1187 | s->event->n_enabled_child_sources++; | |
fd38203a LP |
1188 | |
1189 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1190 | assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0); | |
1191 | event_update_signal_fd(s->event); | |
1192 | } | |
1193 | } | |
1194 | break; | |
1195 | ||
da7e457c | 1196 | case SOURCE_QUIT: |
305f78bf LP |
1197 | s->enabled = m; |
1198 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1199 | break; | |
1200 | ||
1201 | case SOURCE_DEFER: | |
baf76283 | 1202 | s->enabled = m; |
fd38203a LP |
1203 | break; |
1204 | } | |
1205 | } | |
1206 | ||
1207 | if (s->pending) | |
1208 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1209 | ||
1210 | if (s->prepare) | |
1211 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1212 | ||
1213 | return 0; | |
1214 | } | |
1215 | ||
f7262a9f | 1216 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1217 | assert_return(s, -EINVAL); |
1218 | assert_return(usec, -EINVAL); | |
1219 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1220 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1221 | |
1222 | *usec = s->time.next; | |
1223 | return 0; | |
1224 | } | |
1225 | ||
f7262a9f | 1226 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
305f78bf LP |
1227 | assert_return(s, -EINVAL); |
1228 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1229 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1230 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1231 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1232 | |
1233 | if (s->time.next == usec) | |
1234 | return 0; | |
1235 | ||
1236 | s->time.next = usec; | |
1237 | ||
c2ba3ad6 LP |
1238 | if (s->type == SOURCE_REALTIME) { |
1239 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); | |
1240 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1241 | } else { | |
1242 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); | |
1243 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1244 | } | |
fd38203a LP |
1245 | |
1246 | return 0; | |
1247 | } | |
1248 | ||
f7262a9f | 1249 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1250 | assert_return(s, -EINVAL); |
1251 | assert_return(usec, -EINVAL); | |
1252 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1253 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1254 | ||
1255 | *usec = s->time.accuracy; | |
1256 | return 0; | |
1257 | } | |
1258 | ||
f7262a9f | 1259 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
305f78bf LP |
1260 | assert_return(s, -EINVAL); |
1261 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1262 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1263 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1264 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1265 | |
1266 | if (usec == 0) | |
1267 | usec = DEFAULT_ACCURACY_USEC; | |
1268 | ||
1269 | if (s->time.accuracy == usec) | |
1270 | return 0; | |
1271 | ||
eaa3cbef LP |
1272 | s->time.accuracy = usec; |
1273 | ||
1274 | if (s->type == SOURCE_REALTIME) | |
1275 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1276 | else | |
1277 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1278 | ||
1279 | return 0; | |
1280 | } | |
1281 | ||
f7262a9f | 1282 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1283 | assert_return(s, -EINVAL); |
1284 | assert_return(pid, -EINVAL); | |
1285 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1286 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1287 | ||
1288 | *pid = s->child.pid; | |
1289 | return 0; | |
1290 | } | |
1291 | ||
f7262a9f | 1292 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_prepare_handler_t callback) { |
fd38203a LP |
1293 | int r; |
1294 | ||
da7e457c LP |
1295 | assert_return(s, -EINVAL); |
1296 | assert_return(s->type != SOURCE_QUIT, -EDOM); | |
1297 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); | |
1298 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1299 | |
1300 | if (s->prepare == callback) | |
1301 | return 0; | |
1302 | ||
1303 | if (callback && s->prepare) { | |
1304 | s->prepare = callback; | |
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1309 | if (r < 0) | |
1310 | return r; | |
1311 | ||
1312 | s->prepare = callback; | |
1313 | ||
1314 | if (callback) { | |
1315 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1316 | if (r < 0) | |
1317 | return r; | |
1318 | } else | |
1319 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1320 | ||
1321 | return 0; | |
1322 | } | |
1323 | ||
f7262a9f | 1324 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1325 | assert_return(s, NULL); |
fd38203a LP |
1326 | |
1327 | return s->userdata; | |
1328 | } | |
1329 | ||
c2ba3ad6 LP |
1330 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1331 | usec_t c; | |
1332 | assert(e); | |
1333 | assert(a <= b); | |
1334 | ||
1335 | if (a <= 0) | |
1336 | return 0; | |
1337 | ||
1338 | if (b <= a + 1) | |
1339 | return a; | |
1340 | ||
1341 | /* | |
1342 | Find a good time to wake up again between times a and b. We | |
1343 | have two goals here: | |
1344 | ||
1345 | a) We want to wake up as seldom as possible, hence prefer | |
1346 | later times over earlier times. | |
1347 | ||
1348 | b) But if we have to wake up, then let's make sure to | |
1349 | dispatch as much as possible on the entire system. | |
1350 | ||
1351 | We implement this by waking up everywhere at the same time | |
1352 | within any given second if we can, synchronised via the | |
1353 | perturbation value determined from the boot ID. If we can't, | |
1354 | then we try to find the same spot in every a 250ms | |
1355 | step. Otherwise, we pick the last possible time to wake up. | |
1356 | */ | |
1357 | ||
1358 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + e->perturb; | |
1359 | if (c >= b) { | |
1360 | if (_unlikely_(c < USEC_PER_SEC)) | |
1361 | return b; | |
1362 | ||
1363 | c -= USEC_PER_SEC; | |
1364 | } | |
1365 | ||
1366 | if (c >= a) | |
1367 | return c; | |
1368 | ||
1369 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1370 | if (c >= b) { | |
1371 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1372 | return b; | |
1373 | ||
1374 | c -= USEC_PER_MSEC*250; | |
1375 | } | |
1376 | ||
1377 | if (c >= a) | |
1378 | return c; | |
1379 | ||
1380 | return b; | |
1381 | } | |
1382 | ||
fd38203a LP |
1383 | static int event_arm_timer( |
1384 | sd_event *e, | |
1385 | int timer_fd, | |
c2ba3ad6 LP |
1386 | Prioq *earliest, |
1387 | Prioq *latest, | |
fd38203a LP |
1388 | usec_t *next) { |
1389 | ||
1390 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1391 | sd_event_source *a, *b; |
1392 | usec_t t; | |
fd38203a LP |
1393 | int r; |
1394 | ||
1395 | assert_se(e); | |
1396 | assert_se(next); | |
1397 | ||
c2ba3ad6 | 1398 | a = prioq_peek(earliest); |
72aedc1e LP |
1399 | if (!a || a->enabled == SD_EVENT_OFF) { |
1400 | ||
1401 | if (*next == (usec_t) -1) | |
1402 | return 0; | |
1403 | ||
1404 | /* disarm */ | |
1405 | r = timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1406 | if (r < 0) | |
1407 | return r; | |
1408 | ||
1409 | *next = (usec_t) -1; | |
1410 | ||
fd38203a | 1411 | return 0; |
72aedc1e | 1412 | } |
fd38203a | 1413 | |
c2ba3ad6 | 1414 | b = prioq_peek(latest); |
baf76283 | 1415 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1416 | |
1417 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
1418 | if (*next == t) | |
fd38203a LP |
1419 | return 0; |
1420 | ||
1421 | assert_se(timer_fd >= 0); | |
1422 | ||
c2ba3ad6 | 1423 | if (t == 0) { |
fd38203a LP |
1424 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1425 | its.it_value.tv_sec = 0; | |
1426 | its.it_value.tv_nsec = 1; | |
1427 | } else | |
c2ba3ad6 | 1428 | timespec_store(&its.it_value, t); |
fd38203a LP |
1429 | |
1430 | r = timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1431 | if (r < 0) | |
1432 | return r; | |
1433 | ||
c2ba3ad6 | 1434 | *next = t; |
fd38203a LP |
1435 | return 0; |
1436 | } | |
1437 | ||
1438 | static int process_io(sd_event *e, sd_event_source *s, uint32_t events) { | |
1439 | assert(e); | |
1440 | assert(s); | |
1441 | assert(s->type == SOURCE_IO); | |
1442 | ||
1443 | s->io.revents = events; | |
1444 | ||
fd38203a LP |
1445 | return source_set_pending(s, true); |
1446 | } | |
1447 | ||
72aedc1e | 1448 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
1449 | uint64_t x; |
1450 | ssize_t ss; | |
1451 | ||
1452 | assert(e); | |
da7e457c | 1453 | assert(fd >= 0); |
72aedc1e LP |
1454 | assert(next); |
1455 | ||
305f78bf | 1456 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1457 | |
1458 | ss = read(fd, &x, sizeof(x)); | |
1459 | if (ss < 0) { | |
1460 | if (errno == EAGAIN || errno == EINTR) | |
1461 | return 0; | |
1462 | ||
1463 | return -errno; | |
1464 | } | |
1465 | ||
1466 | if (ss != sizeof(x)) | |
1467 | return -EIO; | |
1468 | ||
72aedc1e LP |
1469 | *next = (usec_t) -1; |
1470 | ||
fd38203a LP |
1471 | return 0; |
1472 | } | |
1473 | ||
305f78bf LP |
1474 | static int process_timer( |
1475 | sd_event *e, | |
1476 | usec_t n, | |
1477 | Prioq *earliest, | |
1478 | Prioq *latest) { | |
1479 | ||
fd38203a LP |
1480 | sd_event_source *s; |
1481 | int r; | |
1482 | ||
1483 | assert(e); | |
1484 | ||
1485 | for (;;) { | |
c2ba3ad6 | 1486 | s = prioq_peek(earliest); |
fd38203a LP |
1487 | if (!s || |
1488 | s->time.next > n || | |
baf76283 | 1489 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1490 | s->pending) |
1491 | break; | |
1492 | ||
1493 | r = source_set_pending(s, true); | |
1494 | if (r < 0) | |
1495 | return r; | |
1496 | ||
c2ba3ad6 LP |
1497 | prioq_reshuffle(earliest, s, &s->time.earliest_index); |
1498 | prioq_reshuffle(latest, s, &s->time.latest_index); | |
fd38203a LP |
1499 | } |
1500 | ||
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | static int process_child(sd_event *e) { | |
1505 | sd_event_source *s; | |
1506 | Iterator i; | |
1507 | int r; | |
1508 | ||
1509 | assert(e); | |
1510 | ||
c2ba3ad6 LP |
1511 | e->need_process_child = false; |
1512 | ||
fd38203a LP |
1513 | /* |
1514 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1515 | + WNOHANG for each PID we wait for, instead of using | |
1516 | P_ALL. This is because we only want to get child | |
1517 | information of very specific child processes, and not all | |
1518 | of them. We might not have processed the SIGCHLD even of a | |
1519 | previous invocation and we don't want to maintain a | |
1520 | unbounded *per-child* event queue, hence we really don't | |
1521 | want anything flushed out of the kernel's queue that we | |
1522 | don't care about. Since this is O(n) this means that if you | |
1523 | have a lot of processes you probably want to handle SIGCHLD | |
1524 | yourself. | |
1525 | */ | |
1526 | ||
1527 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1528 | assert(s->type == SOURCE_CHILD); | |
1529 | ||
1530 | if (s->pending) | |
1531 | continue; | |
1532 | ||
baf76283 | 1533 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1534 | continue; |
1535 | ||
1536 | zero(s->child.siginfo); | |
1537 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|s->child.options); | |
1538 | if (r < 0) | |
1539 | return -errno; | |
1540 | ||
1541 | if (s->child.siginfo.si_pid != 0) { | |
1542 | r = source_set_pending(s, true); | |
1543 | if (r < 0) | |
1544 | return r; | |
1545 | } | |
1546 | } | |
1547 | ||
fd38203a LP |
1548 | return 0; |
1549 | } | |
1550 | ||
1551 | static int process_signal(sd_event *e, uint32_t events) { | |
fd38203a | 1552 | bool read_one = false; |
fd38203a LP |
1553 | int r; |
1554 | ||
da7e457c | 1555 | assert(e); |
0eb2e0e3 ZJS |
1556 | assert(e->signal_sources); |
1557 | ||
305f78bf | 1558 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1559 | |
1560 | for (;;) { | |
0eb2e0e3 ZJS |
1561 | struct signalfd_siginfo si; |
1562 | ssize_t ss; | |
fd38203a LP |
1563 | sd_event_source *s; |
1564 | ||
1565 | ss = read(e->signal_fd, &si, sizeof(si)); | |
1566 | if (ss < 0) { | |
1567 | if (errno == EAGAIN || errno == EINTR) | |
1568 | return read_one; | |
1569 | ||
1570 | return -errno; | |
1571 | } | |
1572 | ||
1573 | if (ss != sizeof(si)) | |
1574 | return -EIO; | |
1575 | ||
1576 | read_one = true; | |
1577 | ||
0eb2e0e3 | 1578 | s = e->signal_sources[si.ssi_signo]; |
fd38203a LP |
1579 | if (si.ssi_signo == SIGCHLD) { |
1580 | r = process_child(e); | |
1581 | if (r < 0) | |
1582 | return r; | |
0eb2e0e3 | 1583 | if (r > 0 || !s) |
fd38203a | 1584 | continue; |
0eb2e0e3 | 1585 | } else |
fd38203a LP |
1586 | if (!s) |
1587 | return -EIO; | |
fd38203a LP |
1588 | |
1589 | s->signal.siginfo = si; | |
1590 | r = source_set_pending(s, true); | |
1591 | if (r < 0) | |
1592 | return r; | |
1593 | } | |
1594 | ||
1595 | ||
1596 | return 0; | |
1597 | } | |
1598 | ||
1599 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 1600 | int r = 0; |
fd38203a LP |
1601 | |
1602 | assert(s); | |
da7e457c | 1603 | assert(s->pending || s->type == SOURCE_QUIT); |
fd38203a | 1604 | |
da7e457c LP |
1605 | if (s->type != SOURCE_DEFER && s->type != SOURCE_QUIT) { |
1606 | r = source_set_pending(s, false); | |
1607 | if (r < 0) | |
1608 | return r; | |
1609 | } | |
fd38203a | 1610 | |
baf76283 LP |
1611 | if (s->enabled == SD_EVENT_ONESHOT) { |
1612 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
1613 | if (r < 0) |
1614 | return r; | |
1615 | } | |
1616 | ||
1617 | switch (s->type) { | |
1618 | ||
1619 | case SOURCE_IO: | |
1620 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
1621 | break; | |
1622 | ||
1623 | case SOURCE_MONOTONIC: | |
1624 | r = s->time.callback(s, s->time.next, s->userdata); | |
1625 | break; | |
1626 | ||
1627 | case SOURCE_REALTIME: | |
1628 | r = s->time.callback(s, s->time.next, s->userdata); | |
1629 | break; | |
1630 | ||
1631 | case SOURCE_SIGNAL: | |
1632 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
1633 | break; | |
1634 | ||
1635 | case SOURCE_CHILD: | |
1636 | r = s->child.callback(s, &s->child.siginfo, s->userdata); | |
1637 | break; | |
1638 | ||
1639 | case SOURCE_DEFER: | |
1640 | r = s->defer.callback(s, s->userdata); | |
1641 | break; | |
da7e457c LP |
1642 | |
1643 | case SOURCE_QUIT: | |
1644 | r = s->quit.callback(s, s->userdata); | |
1645 | break; | |
fd38203a LP |
1646 | } |
1647 | ||
1648 | return r; | |
1649 | } | |
1650 | ||
1651 | static int event_prepare(sd_event *e) { | |
1652 | int r; | |
1653 | ||
1654 | assert(e); | |
1655 | ||
1656 | for (;;) { | |
1657 | sd_event_source *s; | |
1658 | ||
1659 | s = prioq_peek(e->prepare); | |
baf76283 | 1660 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1661 | break; |
1662 | ||
1663 | s->prepare_iteration = e->iteration; | |
1664 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
1665 | if (r < 0) | |
1666 | return r; | |
1667 | ||
1668 | assert(s->prepare); | |
1669 | r = s->prepare(s, s->userdata); | |
1670 | if (r < 0) | |
1671 | return r; | |
1672 | ||
1673 | } | |
1674 | ||
1675 | return 0; | |
1676 | } | |
1677 | ||
da7e457c LP |
1678 | static int dispatch_quit(sd_event *e) { |
1679 | sd_event_source *p; | |
1680 | int r; | |
1681 | ||
1682 | assert(e); | |
1683 | ||
1684 | p = prioq_peek(e->quit); | |
baf76283 | 1685 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
1686 | e->state = SD_EVENT_FINISHED; |
1687 | return 0; | |
1688 | } | |
1689 | ||
1690 | sd_event_ref(e); | |
1691 | e->iteration++; | |
1692 | e->state = SD_EVENT_QUITTING; | |
1693 | ||
1694 | r = source_dispatch(p); | |
1695 | ||
1696 | e->state = SD_EVENT_PASSIVE; | |
1697 | sd_event_unref(e); | |
1698 | ||
1699 | return r; | |
1700 | } | |
1701 | ||
c2ba3ad6 LP |
1702 | static sd_event_source* event_next_pending(sd_event *e) { |
1703 | sd_event_source *p; | |
1704 | ||
da7e457c LP |
1705 | assert(e); |
1706 | ||
c2ba3ad6 LP |
1707 | p = prioq_peek(e->pending); |
1708 | if (!p) | |
1709 | return NULL; | |
1710 | ||
baf76283 | 1711 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
1712 | return NULL; |
1713 | ||
1714 | return p; | |
1715 | } | |
1716 | ||
f7262a9f | 1717 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
fd38203a LP |
1718 | struct epoll_event ev_queue[EPOLL_QUEUE_MAX]; |
1719 | sd_event_source *p; | |
305f78bf | 1720 | int r, i, m; |
fd38203a | 1721 | |
da7e457c LP |
1722 | assert_return(e, -EINVAL); |
1723 | assert_return(!event_pid_changed(e), -ECHILD); | |
1724 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1725 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
1726 | ||
1727 | if (e->quit_requested) | |
1728 | return dispatch_quit(e); | |
fd38203a | 1729 | |
da7e457c | 1730 | sd_event_ref(e); |
fd38203a | 1731 | e->iteration++; |
da7e457c | 1732 | e->state = SD_EVENT_RUNNING; |
fd38203a LP |
1733 | |
1734 | r = event_prepare(e); | |
1735 | if (r < 0) | |
da7e457c | 1736 | goto finish; |
fd38203a | 1737 | |
c2ba3ad6 LP |
1738 | if (event_next_pending(e) || e->need_process_child) |
1739 | timeout = 0; | |
fd38203a | 1740 | |
c2ba3ad6 LP |
1741 | if (timeout > 0) { |
1742 | r = event_arm_timer(e, e->monotonic_fd, e->monotonic_earliest, e->monotonic_latest, &e->monotonic_next); | |
1743 | if (r < 0) | |
da7e457c | 1744 | goto finish; |
fd38203a | 1745 | |
c2ba3ad6 LP |
1746 | r = event_arm_timer(e, e->realtime_fd, e->realtime_earliest, e->realtime_latest, &e->realtime_next); |
1747 | if (r < 0) | |
da7e457c | 1748 | goto finish; |
fd38203a LP |
1749 | } |
1750 | ||
c2ba3ad6 LP |
1751 | m = epoll_wait(e->epoll_fd, ev_queue, EPOLL_QUEUE_MAX, |
1752 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); | |
da7e457c | 1753 | if (m < 0) { |
d09d5ecd | 1754 | r = errno == EAGAIN || errno == EINTR ? 0 : -errno; |
da7e457c LP |
1755 | goto finish; |
1756 | } | |
fd38203a | 1757 | |
46e8c825 | 1758 | dual_timestamp_get(&e->timestamp); |
fd38203a LP |
1759 | |
1760 | for (i = 0; i < m; i++) { | |
1761 | ||
1762 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_MONOTONIC)) | |
72aedc1e | 1763 | r = flush_timer(e, e->monotonic_fd, ev_queue[i].events, &e->monotonic_next); |
fd38203a | 1764 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_REALTIME)) |
72aedc1e | 1765 | r = flush_timer(e, e->realtime_fd, ev_queue[i].events, &e->realtime_next); |
fd38203a LP |
1766 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) |
1767 | r = process_signal(e, ev_queue[i].events); | |
1768 | else | |
1769 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
1770 | ||
1771 | if (r < 0) | |
da7e457c | 1772 | goto finish; |
fd38203a LP |
1773 | } |
1774 | ||
46e8c825 | 1775 | r = process_timer(e, e->timestamp.monotonic, e->monotonic_earliest, e->monotonic_latest); |
fd38203a | 1776 | if (r < 0) |
da7e457c | 1777 | goto finish; |
fd38203a | 1778 | |
46e8c825 | 1779 | r = process_timer(e, e->timestamp.realtime, e->realtime_earliest, e->realtime_latest); |
fd38203a | 1780 | if (r < 0) |
da7e457c | 1781 | goto finish; |
fd38203a | 1782 | |
c2ba3ad6 | 1783 | if (e->need_process_child) { |
fd38203a LP |
1784 | r = process_child(e); |
1785 | if (r < 0) | |
da7e457c | 1786 | goto finish; |
fd38203a LP |
1787 | } |
1788 | ||
c2ba3ad6 | 1789 | p = event_next_pending(e); |
da7e457c LP |
1790 | if (!p) { |
1791 | r = 0; | |
1792 | goto finish; | |
1793 | } | |
1794 | ||
1795 | r = source_dispatch(p); | |
fd38203a | 1796 | |
da7e457c LP |
1797 | finish: |
1798 | e->state = SD_EVENT_PASSIVE; | |
1799 | sd_event_unref(e); | |
1800 | ||
1801 | return r; | |
fd38203a LP |
1802 | } |
1803 | ||
f7262a9f | 1804 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
1805 | int r; |
1806 | ||
da7e457c LP |
1807 | assert_return(e, -EINVAL); |
1808 | assert_return(!event_pid_changed(e), -ECHILD); | |
1809 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
1810 | ||
1811 | sd_event_ref(e); | |
fd38203a | 1812 | |
da7e457c | 1813 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
1814 | r = sd_event_run(e, (uint64_t) -1); |
1815 | if (r < 0) | |
da7e457c | 1816 | goto finish; |
fd38203a LP |
1817 | } |
1818 | ||
da7e457c LP |
1819 | r = 0; |
1820 | ||
1821 | finish: | |
1822 | sd_event_unref(e); | |
1823 | return r; | |
fd38203a LP |
1824 | } |
1825 | ||
f7262a9f | 1826 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
1827 | assert_return(e, -EINVAL); |
1828 | assert_return(!event_pid_changed(e), -ECHILD); | |
1829 | ||
1830 | return e->state; | |
1831 | } | |
1832 | ||
f7262a9f | 1833 | _public_ int sd_event_get_quit(sd_event *e) { |
da7e457c LP |
1834 | assert_return(e, -EINVAL); |
1835 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 1836 | |
da7e457c | 1837 | return e->quit_requested; |
fd38203a LP |
1838 | } |
1839 | ||
f7262a9f | 1840 | _public_ int sd_event_request_quit(sd_event *e) { |
da7e457c LP |
1841 | assert_return(e, -EINVAL); |
1842 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1843 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 1844 | |
da7e457c | 1845 | e->quit_requested = true; |
fd38203a LP |
1846 | return 0; |
1847 | } | |
46e8c825 | 1848 | |
f7262a9f | 1849 | _public_ int sd_event_get_now_realtime(sd_event *e, uint64_t *usec) { |
46e8c825 LP |
1850 | assert_return(e, -EINVAL); |
1851 | assert_return(usec, -EINVAL); | |
1852 | assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA); | |
1853 | assert_return(!event_pid_changed(e), -ECHILD); | |
1854 | ||
1855 | *usec = e->timestamp.realtime; | |
1856 | return 0; | |
1857 | } | |
1858 | ||
f7262a9f | 1859 | _public_ int sd_event_get_now_monotonic(sd_event *e, uint64_t *usec) { |
46e8c825 LP |
1860 | assert_return(e, -EINVAL); |
1861 | assert_return(usec, -EINVAL); | |
1862 | assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA); | |
1863 | assert_return(!event_pid_changed(e), -ECHILD); | |
1864 | ||
1865 | *usec = e->timestamp.monotonic; | |
1866 | return 0; | |
1867 | } |