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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 | ||
333 | int sd_event_new(sd_event** ret) { | |
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 | ||
370 | 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 | ||
379 | 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 | ||
559 | int sd_event_add_io( | |
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 | ||
c2ba3ad6 LP |
715 | int sd_event_add_monotonic(sd_event *e, uint64_t usec, uint64_t accuracy, sd_time_handler_t callback, void *userdata, sd_event_source **ret) { |
716 | 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 |
717 | } |
718 | ||
c2ba3ad6 LP |
719 | int sd_event_add_realtime(sd_event *e, uint64_t usec, uint64_t accuracy, sd_time_handler_t callback, void *userdata, sd_event_source **ret) { |
720 | 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 |
721 | } |
722 | ||
723 | static int event_update_signal_fd(sd_event *e) { | |
724 | struct epoll_event ev = {}; | |
725 | bool add_to_epoll; | |
726 | int r; | |
727 | ||
728 | assert(e); | |
729 | ||
730 | add_to_epoll = e->signal_fd < 0; | |
731 | ||
732 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
733 | if (r < 0) | |
734 | return -errno; | |
735 | ||
736 | e->signal_fd = r; | |
737 | ||
738 | if (!add_to_epoll) | |
739 | return 0; | |
740 | ||
741 | ev.events = EPOLLIN; | |
742 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
743 | ||
744 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
745 | if (r < 0) { | |
746 | close_nointr_nofail(e->signal_fd); | |
747 | e->signal_fd = -1; | |
748 | ||
749 | return -errno; | |
750 | } | |
751 | ||
752 | return 0; | |
753 | } | |
754 | ||
305f78bf LP |
755 | int sd_event_add_signal( |
756 | sd_event *e, | |
757 | int sig, | |
758 | sd_signal_handler_t callback, | |
759 | void *userdata, | |
760 | sd_event_source **ret) { | |
761 | ||
fd38203a LP |
762 | sd_event_source *s; |
763 | int r; | |
764 | ||
305f78bf LP |
765 | assert_return(e, -EINVAL); |
766 | assert_return(sig > 0, -EINVAL); | |
767 | assert_return(sig < _NSIG, -EINVAL); | |
768 | assert_return(callback, -EINVAL); | |
769 | assert_return(ret, -EINVAL); | |
da7e457c | 770 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 771 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
772 | |
773 | if (!e->signal_sources) { | |
774 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
775 | if (!e->signal_sources) | |
776 | return -ENOMEM; | |
777 | } else if (e->signal_sources[sig]) | |
778 | return -EBUSY; | |
779 | ||
780 | s = source_new(e, SOURCE_SIGNAL); | |
781 | if (!s) | |
782 | return -ENOMEM; | |
783 | ||
784 | s->signal.sig = sig; | |
785 | s->signal.callback = callback; | |
786 | s->userdata = userdata; | |
baf76283 | 787 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
788 | |
789 | e->signal_sources[sig] = s; | |
790 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
791 | ||
baf76283 | 792 | if (sig != SIGCHLD || e->n_enabled_child_sources == 0) { |
fd38203a LP |
793 | r = event_update_signal_fd(e); |
794 | if (r < 0) { | |
795 | source_free(s); | |
796 | return r; | |
797 | } | |
798 | } | |
799 | ||
800 | *ret = s; | |
801 | return 0; | |
802 | } | |
803 | ||
305f78bf LP |
804 | int sd_event_add_child( |
805 | sd_event *e, | |
806 | pid_t pid, | |
807 | int options, | |
808 | sd_child_handler_t callback, | |
809 | void *userdata, | |
810 | sd_event_source **ret) { | |
811 | ||
fd38203a LP |
812 | sd_event_source *s; |
813 | int r; | |
814 | ||
305f78bf LP |
815 | assert_return(e, -EINVAL); |
816 | assert_return(pid > 1, -EINVAL); | |
817 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
818 | assert_return(options != 0, -EINVAL); | |
819 | assert_return(callback, -EINVAL); | |
820 | assert_return(ret, -EINVAL); | |
da7e457c | 821 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 822 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
823 | |
824 | r = hashmap_ensure_allocated(&e->child_sources, trivial_hash_func, trivial_compare_func); | |
825 | if (r < 0) | |
826 | return r; | |
827 | ||
828 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
829 | return -EBUSY; | |
830 | ||
831 | s = source_new(e, SOURCE_CHILD); | |
832 | if (!s) | |
833 | return -ENOMEM; | |
834 | ||
835 | s->child.pid = pid; | |
836 | s->child.options = options; | |
837 | s->child.callback = callback; | |
838 | s->userdata = userdata; | |
baf76283 | 839 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
840 | |
841 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
842 | if (r < 0) { | |
843 | source_free(s); | |
844 | return r; | |
845 | } | |
846 | ||
baf76283 | 847 | e->n_enabled_child_sources ++; |
fd38203a LP |
848 | |
849 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
850 | ||
851 | if (!e->signal_sources || !e->signal_sources[SIGCHLD]) { | |
852 | r = event_update_signal_fd(e); | |
853 | if (r < 0) { | |
854 | source_free(s); | |
855 | return -errno; | |
856 | } | |
857 | } | |
858 | ||
c2ba3ad6 LP |
859 | e->need_process_child = true; |
860 | ||
fd38203a LP |
861 | *ret = s; |
862 | return 0; | |
863 | } | |
864 | ||
305f78bf LP |
865 | int sd_event_add_defer( |
866 | sd_event *e, | |
867 | sd_defer_handler_t callback, | |
868 | void *userdata, | |
869 | sd_event_source **ret) { | |
870 | ||
fd38203a LP |
871 | sd_event_source *s; |
872 | int r; | |
873 | ||
305f78bf LP |
874 | assert_return(e, -EINVAL); |
875 | assert_return(callback, -EINVAL); | |
876 | assert_return(ret, -EINVAL); | |
da7e457c | 877 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 878 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
879 | |
880 | s = source_new(e, SOURCE_DEFER); | |
881 | if (!s) | |
882 | return -ENOMEM; | |
883 | ||
884 | s->defer.callback = callback; | |
885 | s->userdata = userdata; | |
baf76283 | 886 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
887 | |
888 | r = source_set_pending(s, true); | |
889 | if (r < 0) { | |
890 | source_free(s); | |
891 | return r; | |
892 | } | |
893 | ||
894 | *ret = s; | |
895 | return 0; | |
896 | } | |
897 | ||
305f78bf LP |
898 | int sd_event_add_quit( |
899 | sd_event *e, | |
900 | sd_quit_handler_t callback, | |
901 | void *userdata, | |
902 | sd_event_source **ret) { | |
903 | ||
da7e457c LP |
904 | sd_event_source *s; |
905 | int r; | |
906 | ||
907 | assert_return(e, -EINVAL); | |
908 | assert_return(callback, -EINVAL); | |
305f78bf | 909 | assert_return(ret, -EINVAL); |
da7e457c LP |
910 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
911 | assert_return(!event_pid_changed(e), -ECHILD); | |
912 | ||
913 | if (!e->quit) { | |
914 | e->quit = prioq_new(quit_prioq_compare); | |
915 | if (!e->quit) | |
916 | return -ENOMEM; | |
917 | } | |
918 | ||
919 | s = source_new(e, SOURCE_QUIT); | |
fd38203a | 920 | if (!s) |
da7e457c | 921 | return -ENOMEM; |
fd38203a | 922 | |
da7e457c LP |
923 | s->quit.callback = callback; |
924 | s->userdata = userdata; | |
925 | s->quit.prioq_index = PRIOQ_IDX_NULL; | |
baf76283 | 926 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c LP |
927 | |
928 | r = prioq_put(s->event->quit, s, &s->quit.prioq_index); | |
929 | if (r < 0) { | |
930 | source_free(s); | |
931 | return r; | |
932 | } | |
933 | ||
934 | *ret = s; | |
935 | return 0; | |
936 | } | |
937 | ||
938 | sd_event_source* sd_event_source_ref(sd_event_source *s) { | |
939 | assert_return(s, NULL); | |
940 | ||
941 | assert(s->n_ref >= 1); | |
942 | s->n_ref++; | |
fd38203a LP |
943 | |
944 | return s; | |
945 | } | |
946 | ||
947 | sd_event_source* sd_event_source_unref(sd_event_source *s) { | |
da7e457c | 948 | assert_return(s, NULL); |
fd38203a | 949 | |
da7e457c LP |
950 | assert(s->n_ref >= 1); |
951 | s->n_ref--; | |
952 | ||
953 | if (s->n_ref <= 0) | |
fd38203a LP |
954 | source_free(s); |
955 | ||
956 | return NULL; | |
957 | } | |
958 | ||
eaa3cbef | 959 | sd_event *sd_event_get(sd_event_source *s) { |
305f78bf | 960 | assert_return(s, NULL); |
eaa3cbef LP |
961 | |
962 | return s->event; | |
963 | } | |
964 | ||
fd38203a | 965 | int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf LP |
966 | assert_return(s, -EINVAL); |
967 | assert_return(s->type != SOURCE_QUIT, -EDOM); | |
da7e457c | 968 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 969 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
970 | |
971 | return s->pending; | |
972 | } | |
973 | ||
974 | int sd_event_source_get_io_fd(sd_event_source *s) { | |
305f78bf LP |
975 | assert_return(s, -EINVAL); |
976 | assert_return(s->type == SOURCE_IO, -EDOM); | |
977 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
978 | |
979 | return s->io.fd; | |
980 | } | |
981 | ||
982 | int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { | |
305f78bf LP |
983 | assert_return(s, -EINVAL); |
984 | assert_return(events, -EINVAL); | |
985 | assert_return(s->type == SOURCE_IO, -EDOM); | |
986 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
987 | |
988 | *events = s->io.events; | |
989 | return 0; | |
990 | } | |
991 | ||
992 | int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { | |
993 | int r; | |
994 | ||
305f78bf LP |
995 | assert_return(s, -EINVAL); |
996 | assert_return(s->type == SOURCE_IO, -EDOM); | |
997 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP)), -EINVAL); | |
da7e457c | 998 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 999 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1000 | |
1001 | if (s->io.events == events) | |
1002 | return 0; | |
1003 | ||
baf76283 | 1004 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1005 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1006 | if (r < 0) |
1007 | return r; | |
1008 | } | |
1009 | ||
1010 | s->io.events = events; | |
1011 | ||
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { | |
305f78bf LP |
1016 | assert_return(s, -EINVAL); |
1017 | assert_return(revents, -EINVAL); | |
1018 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1019 | assert_return(s->pending, -ENODATA); | |
1020 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1021 | |
1022 | *revents = s->io.revents; | |
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | int sd_event_source_get_signal(sd_event_source *s) { | |
305f78bf LP |
1027 | assert_return(s, -EINVAL); |
1028 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1029 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1030 | |
1031 | return s->signal.sig; | |
1032 | } | |
1033 | ||
1034 | int sd_event_source_get_priority(sd_event_source *s, int *priority) { | |
305f78bf LP |
1035 | assert_return(s, -EINVAL); |
1036 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1037 | |
1038 | return s->priority; | |
1039 | } | |
1040 | ||
1041 | int sd_event_source_set_priority(sd_event_source *s, int priority) { | |
305f78bf | 1042 | assert_return(s, -EINVAL); |
da7e457c | 1043 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1044 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1045 | |
1046 | if (s->priority == priority) | |
1047 | return 0; | |
1048 | ||
1049 | s->priority = priority; | |
1050 | ||
1051 | if (s->pending) | |
c2ba3ad6 | 1052 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1053 | |
1054 | if (s->prepare) | |
c2ba3ad6 | 1055 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1056 | |
305f78bf LP |
1057 | if (s->type == SOURCE_QUIT) |
1058 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1059 | ||
fd38203a LP |
1060 | return 0; |
1061 | } | |
1062 | ||
baf76283 | 1063 | int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1064 | assert_return(s, -EINVAL); |
1065 | assert_return(m, -EINVAL); | |
1066 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1067 | |
baf76283 | 1068 | *m = s->enabled; |
fd38203a LP |
1069 | return 0; |
1070 | } | |
1071 | ||
baf76283 | 1072 | int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1073 | int r; |
1074 | ||
305f78bf LP |
1075 | assert_return(s, -EINVAL); |
1076 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
da7e457c | 1077 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1078 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1079 | |
baf76283 | 1080 | if (s->enabled == m) |
fd38203a LP |
1081 | return 0; |
1082 | ||
baf76283 | 1083 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1084 | |
1085 | switch (s->type) { | |
1086 | ||
1087 | case SOURCE_IO: | |
1088 | r = source_io_unregister(s); | |
1089 | if (r < 0) | |
1090 | return r; | |
1091 | ||
baf76283 | 1092 | s->enabled = m; |
fd38203a LP |
1093 | break; |
1094 | ||
1095 | case SOURCE_MONOTONIC: | |
baf76283 | 1096 | s->enabled = m; |
c2ba3ad6 LP |
1097 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); |
1098 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
1099 | break; |
1100 | ||
1101 | case SOURCE_REALTIME: | |
baf76283 | 1102 | s->enabled = m; |
c2ba3ad6 LP |
1103 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); |
1104 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
1105 | break; |
1106 | ||
1107 | case SOURCE_SIGNAL: | |
baf76283 LP |
1108 | s->enabled = m; |
1109 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { | |
fd38203a LP |
1110 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
1111 | event_update_signal_fd(s->event); | |
1112 | } | |
1113 | ||
1114 | break; | |
1115 | ||
1116 | case SOURCE_CHILD: | |
baf76283 | 1117 | s->enabled = m; |
fd38203a | 1118 | |
baf76283 LP |
1119 | assert(s->event->n_enabled_child_sources > 0); |
1120 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
1121 | |
1122 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1123 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
1124 | event_update_signal_fd(s->event); | |
1125 | } | |
1126 | ||
1127 | break; | |
1128 | ||
da7e457c | 1129 | case SOURCE_QUIT: |
305f78bf LP |
1130 | s->enabled = m; |
1131 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1132 | break; | |
1133 | ||
1134 | case SOURCE_DEFER: | |
baf76283 | 1135 | s->enabled = m; |
fd38203a LP |
1136 | break; |
1137 | } | |
1138 | ||
1139 | } else { | |
1140 | switch (s->type) { | |
1141 | ||
1142 | case SOURCE_IO: | |
1143 | r = source_io_register(s, m, s->io.events); | |
1144 | if (r < 0) | |
1145 | return r; | |
1146 | ||
baf76283 | 1147 | s->enabled = m; |
fd38203a LP |
1148 | break; |
1149 | ||
1150 | case SOURCE_MONOTONIC: | |
baf76283 | 1151 | s->enabled = m; |
c2ba3ad6 LP |
1152 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); |
1153 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
1154 | break; |
1155 | ||
1156 | case SOURCE_REALTIME: | |
baf76283 | 1157 | s->enabled = m; |
c2ba3ad6 LP |
1158 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); |
1159 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
1160 | break; |
1161 | ||
1162 | case SOURCE_SIGNAL: | |
baf76283 | 1163 | s->enabled = m; |
fd38203a | 1164 | |
baf76283 | 1165 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { |
fd38203a LP |
1166 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
1167 | event_update_signal_fd(s->event); | |
1168 | } | |
1169 | break; | |
1170 | ||
1171 | case SOURCE_CHILD: | |
baf76283 | 1172 | s->enabled = m; |
fd38203a | 1173 | |
baf76283 LP |
1174 | if (s->enabled == SD_EVENT_OFF) { |
1175 | s->event->n_enabled_child_sources++; | |
fd38203a LP |
1176 | |
1177 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1178 | assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0); | |
1179 | event_update_signal_fd(s->event); | |
1180 | } | |
1181 | } | |
1182 | break; | |
1183 | ||
da7e457c | 1184 | case SOURCE_QUIT: |
305f78bf LP |
1185 | s->enabled = m; |
1186 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1187 | break; | |
1188 | ||
1189 | case SOURCE_DEFER: | |
baf76283 | 1190 | s->enabled = m; |
fd38203a LP |
1191 | break; |
1192 | } | |
1193 | } | |
1194 | ||
1195 | if (s->pending) | |
1196 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1197 | ||
1198 | if (s->prepare) | |
1199 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { | |
305f78bf LP |
1205 | assert_return(s, -EINVAL); |
1206 | assert_return(usec, -EINVAL); | |
1207 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1208 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1209 | |
1210 | *usec = s->time.next; | |
1211 | return 0; | |
1212 | } | |
1213 | ||
1214 | int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { | |
305f78bf LP |
1215 | assert_return(s, -EINVAL); |
1216 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1217 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1218 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1219 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1220 | |
1221 | if (s->time.next == usec) | |
1222 | return 0; | |
1223 | ||
1224 | s->time.next = usec; | |
1225 | ||
c2ba3ad6 LP |
1226 | if (s->type == SOURCE_REALTIME) { |
1227 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); | |
1228 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1229 | } else { | |
1230 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); | |
1231 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1232 | } | |
fd38203a LP |
1233 | |
1234 | return 0; | |
1235 | } | |
1236 | ||
305f78bf LP |
1237 | int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
1238 | assert_return(s, -EINVAL); | |
1239 | assert_return(usec, -EINVAL); | |
1240 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1241 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1242 | ||
1243 | *usec = s->time.accuracy; | |
1244 | return 0; | |
1245 | } | |
1246 | ||
eaa3cbef | 1247 | int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
305f78bf LP |
1248 | assert_return(s, -EINVAL); |
1249 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1250 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1251 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1252 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1253 | |
1254 | if (usec == 0) | |
1255 | usec = DEFAULT_ACCURACY_USEC; | |
1256 | ||
1257 | if (s->time.accuracy == usec) | |
1258 | return 0; | |
1259 | ||
eaa3cbef LP |
1260 | s->time.accuracy = usec; |
1261 | ||
1262 | if (s->type == SOURCE_REALTIME) | |
1263 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1264 | else | |
1265 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1266 | ||
1267 | return 0; | |
1268 | } | |
1269 | ||
4bee8012 LP |
1270 | int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
1271 | assert_return(s, -EINVAL); | |
1272 | assert_return(pid, -EINVAL); | |
1273 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1274 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1275 | ||
1276 | *pid = s->child.pid; | |
1277 | return 0; | |
1278 | } | |
1279 | ||
fd38203a LP |
1280 | int sd_event_source_set_prepare(sd_event_source *s, sd_prepare_handler_t callback) { |
1281 | int r; | |
1282 | ||
da7e457c LP |
1283 | assert_return(s, -EINVAL); |
1284 | assert_return(s->type != SOURCE_QUIT, -EDOM); | |
1285 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); | |
1286 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1287 | |
1288 | if (s->prepare == callback) | |
1289 | return 0; | |
1290 | ||
1291 | if (callback && s->prepare) { | |
1292 | s->prepare = callback; | |
1293 | return 0; | |
1294 | } | |
1295 | ||
1296 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1297 | if (r < 0) | |
1298 | return r; | |
1299 | ||
1300 | s->prepare = callback; | |
1301 | ||
1302 | if (callback) { | |
1303 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1304 | if (r < 0) | |
1305 | return r; | |
1306 | } else | |
1307 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1308 | ||
1309 | return 0; | |
1310 | } | |
1311 | ||
1312 | void* sd_event_source_get_userdata(sd_event_source *s) { | |
da7e457c | 1313 | assert_return(s, NULL); |
fd38203a LP |
1314 | |
1315 | return s->userdata; | |
1316 | } | |
1317 | ||
c2ba3ad6 LP |
1318 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1319 | usec_t c; | |
1320 | assert(e); | |
1321 | assert(a <= b); | |
1322 | ||
1323 | if (a <= 0) | |
1324 | return 0; | |
1325 | ||
1326 | if (b <= a + 1) | |
1327 | return a; | |
1328 | ||
1329 | /* | |
1330 | Find a good time to wake up again between times a and b. We | |
1331 | have two goals here: | |
1332 | ||
1333 | a) We want to wake up as seldom as possible, hence prefer | |
1334 | later times over earlier times. | |
1335 | ||
1336 | b) But if we have to wake up, then let's make sure to | |
1337 | dispatch as much as possible on the entire system. | |
1338 | ||
1339 | We implement this by waking up everywhere at the same time | |
1340 | within any given second if we can, synchronised via the | |
1341 | perturbation value determined from the boot ID. If we can't, | |
1342 | then we try to find the same spot in every a 250ms | |
1343 | step. Otherwise, we pick the last possible time to wake up. | |
1344 | */ | |
1345 | ||
1346 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + e->perturb; | |
1347 | if (c >= b) { | |
1348 | if (_unlikely_(c < USEC_PER_SEC)) | |
1349 | return b; | |
1350 | ||
1351 | c -= USEC_PER_SEC; | |
1352 | } | |
1353 | ||
1354 | if (c >= a) | |
1355 | return c; | |
1356 | ||
1357 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1358 | if (c >= b) { | |
1359 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1360 | return b; | |
1361 | ||
1362 | c -= USEC_PER_MSEC*250; | |
1363 | } | |
1364 | ||
1365 | if (c >= a) | |
1366 | return c; | |
1367 | ||
1368 | return b; | |
1369 | } | |
1370 | ||
fd38203a LP |
1371 | static int event_arm_timer( |
1372 | sd_event *e, | |
1373 | int timer_fd, | |
c2ba3ad6 LP |
1374 | Prioq *earliest, |
1375 | Prioq *latest, | |
fd38203a LP |
1376 | usec_t *next) { |
1377 | ||
1378 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1379 | sd_event_source *a, *b; |
1380 | usec_t t; | |
fd38203a LP |
1381 | int r; |
1382 | ||
1383 | assert_se(e); | |
1384 | assert_se(next); | |
1385 | ||
c2ba3ad6 | 1386 | a = prioq_peek(earliest); |
baf76283 | 1387 | if (!a || a->enabled == SD_EVENT_OFF) |
fd38203a LP |
1388 | return 0; |
1389 | ||
c2ba3ad6 | 1390 | b = prioq_peek(latest); |
baf76283 | 1391 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1392 | |
1393 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
1394 | if (*next == t) | |
fd38203a LP |
1395 | return 0; |
1396 | ||
1397 | assert_se(timer_fd >= 0); | |
1398 | ||
c2ba3ad6 | 1399 | if (t == 0) { |
fd38203a LP |
1400 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1401 | its.it_value.tv_sec = 0; | |
1402 | its.it_value.tv_nsec = 1; | |
1403 | } else | |
c2ba3ad6 | 1404 | timespec_store(&its.it_value, t); |
fd38203a LP |
1405 | |
1406 | r = timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1407 | if (r < 0) | |
1408 | return r; | |
1409 | ||
c2ba3ad6 | 1410 | *next = t; |
fd38203a LP |
1411 | return 0; |
1412 | } | |
1413 | ||
1414 | static int process_io(sd_event *e, sd_event_source *s, uint32_t events) { | |
1415 | assert(e); | |
1416 | assert(s); | |
1417 | assert(s->type == SOURCE_IO); | |
1418 | ||
1419 | s->io.revents = events; | |
1420 | ||
1421 | /* | |
1422 | If this is a oneshot event source, then we added it to the | |
1423 | epoll with EPOLLONESHOT, hence we know it's not registered | |
1424 | anymore. We can save a syscall here... | |
1425 | */ | |
1426 | ||
baf76283 | 1427 | if (s->enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
1428 | s->io.registered = false; |
1429 | ||
1430 | return source_set_pending(s, true); | |
1431 | } | |
1432 | ||
1433 | static int flush_timer(sd_event *e, int fd, uint32_t events) { | |
1434 | uint64_t x; | |
1435 | ssize_t ss; | |
1436 | ||
1437 | assert(e); | |
da7e457c | 1438 | assert(fd >= 0); |
305f78bf | 1439 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1440 | |
1441 | ss = read(fd, &x, sizeof(x)); | |
1442 | if (ss < 0) { | |
1443 | if (errno == EAGAIN || errno == EINTR) | |
1444 | return 0; | |
1445 | ||
1446 | return -errno; | |
1447 | } | |
1448 | ||
1449 | if (ss != sizeof(x)) | |
1450 | return -EIO; | |
1451 | ||
1452 | return 0; | |
1453 | } | |
1454 | ||
305f78bf LP |
1455 | static int process_timer( |
1456 | sd_event *e, | |
1457 | usec_t n, | |
1458 | Prioq *earliest, | |
1459 | Prioq *latest) { | |
1460 | ||
fd38203a LP |
1461 | sd_event_source *s; |
1462 | int r; | |
1463 | ||
1464 | assert(e); | |
1465 | ||
1466 | for (;;) { | |
c2ba3ad6 | 1467 | s = prioq_peek(earliest); |
fd38203a LP |
1468 | if (!s || |
1469 | s->time.next > n || | |
baf76283 | 1470 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1471 | s->pending) |
1472 | break; | |
1473 | ||
1474 | r = source_set_pending(s, true); | |
1475 | if (r < 0) | |
1476 | return r; | |
1477 | ||
c2ba3ad6 LP |
1478 | prioq_reshuffle(earliest, s, &s->time.earliest_index); |
1479 | prioq_reshuffle(latest, s, &s->time.latest_index); | |
fd38203a LP |
1480 | } |
1481 | ||
1482 | return 0; | |
1483 | } | |
1484 | ||
1485 | static int process_child(sd_event *e) { | |
1486 | sd_event_source *s; | |
1487 | Iterator i; | |
1488 | int r; | |
1489 | ||
1490 | assert(e); | |
1491 | ||
c2ba3ad6 LP |
1492 | e->need_process_child = false; |
1493 | ||
fd38203a LP |
1494 | /* |
1495 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1496 | + WNOHANG for each PID we wait for, instead of using | |
1497 | P_ALL. This is because we only want to get child | |
1498 | information of very specific child processes, and not all | |
1499 | of them. We might not have processed the SIGCHLD even of a | |
1500 | previous invocation and we don't want to maintain a | |
1501 | unbounded *per-child* event queue, hence we really don't | |
1502 | want anything flushed out of the kernel's queue that we | |
1503 | don't care about. Since this is O(n) this means that if you | |
1504 | have a lot of processes you probably want to handle SIGCHLD | |
1505 | yourself. | |
1506 | */ | |
1507 | ||
1508 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1509 | assert(s->type == SOURCE_CHILD); | |
1510 | ||
1511 | if (s->pending) | |
1512 | continue; | |
1513 | ||
baf76283 | 1514 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1515 | continue; |
1516 | ||
1517 | zero(s->child.siginfo); | |
1518 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|s->child.options); | |
1519 | if (r < 0) | |
1520 | return -errno; | |
1521 | ||
1522 | if (s->child.siginfo.si_pid != 0) { | |
1523 | r = source_set_pending(s, true); | |
1524 | if (r < 0) | |
1525 | return r; | |
1526 | } | |
1527 | } | |
1528 | ||
fd38203a LP |
1529 | return 0; |
1530 | } | |
1531 | ||
1532 | static int process_signal(sd_event *e, uint32_t events) { | |
fd38203a | 1533 | bool read_one = false; |
fd38203a LP |
1534 | int r; |
1535 | ||
da7e457c | 1536 | assert(e); |
0eb2e0e3 ZJS |
1537 | assert(e->signal_sources); |
1538 | ||
305f78bf | 1539 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1540 | |
1541 | for (;;) { | |
0eb2e0e3 ZJS |
1542 | struct signalfd_siginfo si; |
1543 | ssize_t ss; | |
fd38203a LP |
1544 | sd_event_source *s; |
1545 | ||
1546 | ss = read(e->signal_fd, &si, sizeof(si)); | |
1547 | if (ss < 0) { | |
1548 | if (errno == EAGAIN || errno == EINTR) | |
1549 | return read_one; | |
1550 | ||
1551 | return -errno; | |
1552 | } | |
1553 | ||
1554 | if (ss != sizeof(si)) | |
1555 | return -EIO; | |
1556 | ||
1557 | read_one = true; | |
1558 | ||
0eb2e0e3 | 1559 | s = e->signal_sources[si.ssi_signo]; |
fd38203a LP |
1560 | if (si.ssi_signo == SIGCHLD) { |
1561 | r = process_child(e); | |
1562 | if (r < 0) | |
1563 | return r; | |
0eb2e0e3 | 1564 | if (r > 0 || !s) |
fd38203a | 1565 | continue; |
0eb2e0e3 | 1566 | } else |
fd38203a LP |
1567 | if (!s) |
1568 | return -EIO; | |
fd38203a LP |
1569 | |
1570 | s->signal.siginfo = si; | |
1571 | r = source_set_pending(s, true); | |
1572 | if (r < 0) | |
1573 | return r; | |
1574 | } | |
1575 | ||
1576 | ||
1577 | return 0; | |
1578 | } | |
1579 | ||
1580 | static int source_dispatch(sd_event_source *s) { | |
1581 | int r; | |
1582 | ||
1583 | assert(s); | |
da7e457c | 1584 | assert(s->pending || s->type == SOURCE_QUIT); |
fd38203a | 1585 | |
da7e457c LP |
1586 | if (s->type != SOURCE_DEFER && s->type != SOURCE_QUIT) { |
1587 | r = source_set_pending(s, false); | |
1588 | if (r < 0) | |
1589 | return r; | |
1590 | } | |
fd38203a | 1591 | |
baf76283 LP |
1592 | if (s->enabled == SD_EVENT_ONESHOT) { |
1593 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
1594 | if (r < 0) |
1595 | return r; | |
1596 | } | |
1597 | ||
1598 | switch (s->type) { | |
1599 | ||
1600 | case SOURCE_IO: | |
1601 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
1602 | break; | |
1603 | ||
1604 | case SOURCE_MONOTONIC: | |
1605 | r = s->time.callback(s, s->time.next, s->userdata); | |
1606 | break; | |
1607 | ||
1608 | case SOURCE_REALTIME: | |
1609 | r = s->time.callback(s, s->time.next, s->userdata); | |
1610 | break; | |
1611 | ||
1612 | case SOURCE_SIGNAL: | |
1613 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
1614 | break; | |
1615 | ||
1616 | case SOURCE_CHILD: | |
1617 | r = s->child.callback(s, &s->child.siginfo, s->userdata); | |
1618 | break; | |
1619 | ||
1620 | case SOURCE_DEFER: | |
1621 | r = s->defer.callback(s, s->userdata); | |
1622 | break; | |
da7e457c LP |
1623 | |
1624 | case SOURCE_QUIT: | |
1625 | r = s->quit.callback(s, s->userdata); | |
1626 | break; | |
fd38203a LP |
1627 | } |
1628 | ||
1629 | return r; | |
1630 | } | |
1631 | ||
1632 | static int event_prepare(sd_event *e) { | |
1633 | int r; | |
1634 | ||
1635 | assert(e); | |
1636 | ||
1637 | for (;;) { | |
1638 | sd_event_source *s; | |
1639 | ||
1640 | s = prioq_peek(e->prepare); | |
baf76283 | 1641 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1642 | break; |
1643 | ||
1644 | s->prepare_iteration = e->iteration; | |
1645 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
1646 | if (r < 0) | |
1647 | return r; | |
1648 | ||
1649 | assert(s->prepare); | |
1650 | r = s->prepare(s, s->userdata); | |
1651 | if (r < 0) | |
1652 | return r; | |
1653 | ||
1654 | } | |
1655 | ||
1656 | return 0; | |
1657 | } | |
1658 | ||
da7e457c LP |
1659 | static int dispatch_quit(sd_event *e) { |
1660 | sd_event_source *p; | |
1661 | int r; | |
1662 | ||
1663 | assert(e); | |
1664 | ||
1665 | p = prioq_peek(e->quit); | |
baf76283 | 1666 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
1667 | e->state = SD_EVENT_FINISHED; |
1668 | return 0; | |
1669 | } | |
1670 | ||
1671 | sd_event_ref(e); | |
1672 | e->iteration++; | |
1673 | e->state = SD_EVENT_QUITTING; | |
1674 | ||
1675 | r = source_dispatch(p); | |
1676 | ||
1677 | e->state = SD_EVENT_PASSIVE; | |
1678 | sd_event_unref(e); | |
1679 | ||
1680 | return r; | |
1681 | } | |
1682 | ||
c2ba3ad6 LP |
1683 | static sd_event_source* event_next_pending(sd_event *e) { |
1684 | sd_event_source *p; | |
1685 | ||
da7e457c LP |
1686 | assert(e); |
1687 | ||
c2ba3ad6 LP |
1688 | p = prioq_peek(e->pending); |
1689 | if (!p) | |
1690 | return NULL; | |
1691 | ||
baf76283 | 1692 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
1693 | return NULL; |
1694 | ||
1695 | return p; | |
1696 | } | |
1697 | ||
fd38203a LP |
1698 | int sd_event_run(sd_event *e, uint64_t timeout) { |
1699 | struct epoll_event ev_queue[EPOLL_QUEUE_MAX]; | |
1700 | sd_event_source *p; | |
305f78bf | 1701 | int r, i, m; |
fd38203a | 1702 | |
da7e457c LP |
1703 | assert_return(e, -EINVAL); |
1704 | assert_return(!event_pid_changed(e), -ECHILD); | |
1705 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1706 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
1707 | ||
1708 | if (e->quit_requested) | |
1709 | return dispatch_quit(e); | |
fd38203a | 1710 | |
da7e457c | 1711 | sd_event_ref(e); |
fd38203a | 1712 | e->iteration++; |
da7e457c | 1713 | e->state = SD_EVENT_RUNNING; |
fd38203a LP |
1714 | |
1715 | r = event_prepare(e); | |
1716 | if (r < 0) | |
da7e457c | 1717 | goto finish; |
fd38203a | 1718 | |
c2ba3ad6 LP |
1719 | if (event_next_pending(e) || e->need_process_child) |
1720 | timeout = 0; | |
fd38203a | 1721 | |
c2ba3ad6 LP |
1722 | if (timeout > 0) { |
1723 | r = event_arm_timer(e, e->monotonic_fd, e->monotonic_earliest, e->monotonic_latest, &e->monotonic_next); | |
1724 | if (r < 0) | |
da7e457c | 1725 | goto finish; |
fd38203a | 1726 | |
c2ba3ad6 LP |
1727 | r = event_arm_timer(e, e->realtime_fd, e->realtime_earliest, e->realtime_latest, &e->realtime_next); |
1728 | if (r < 0) | |
da7e457c | 1729 | goto finish; |
fd38203a LP |
1730 | } |
1731 | ||
c2ba3ad6 LP |
1732 | m = epoll_wait(e->epoll_fd, ev_queue, EPOLL_QUEUE_MAX, |
1733 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); | |
da7e457c LP |
1734 | if (m < 0) { |
1735 | r = m; | |
1736 | goto finish; | |
1737 | } | |
fd38203a | 1738 | |
46e8c825 | 1739 | dual_timestamp_get(&e->timestamp); |
fd38203a LP |
1740 | |
1741 | for (i = 0; i < m; i++) { | |
1742 | ||
1743 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_MONOTONIC)) | |
1744 | r = flush_timer(e, e->monotonic_fd, ev_queue[i].events); | |
1745 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_REALTIME)) | |
1746 | r = flush_timer(e, e->realtime_fd, ev_queue[i].events); | |
1747 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) | |
1748 | r = process_signal(e, ev_queue[i].events); | |
1749 | else | |
1750 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
1751 | ||
1752 | if (r < 0) | |
da7e457c | 1753 | goto finish; |
fd38203a LP |
1754 | } |
1755 | ||
46e8c825 | 1756 | r = process_timer(e, e->timestamp.monotonic, e->monotonic_earliest, e->monotonic_latest); |
fd38203a | 1757 | if (r < 0) |
da7e457c | 1758 | goto finish; |
fd38203a | 1759 | |
46e8c825 | 1760 | r = process_timer(e, e->timestamp.realtime, e->realtime_earliest, e->realtime_latest); |
fd38203a | 1761 | if (r < 0) |
da7e457c | 1762 | goto finish; |
fd38203a | 1763 | |
c2ba3ad6 | 1764 | if (e->need_process_child) { |
fd38203a LP |
1765 | r = process_child(e); |
1766 | if (r < 0) | |
da7e457c | 1767 | goto finish; |
fd38203a LP |
1768 | } |
1769 | ||
c2ba3ad6 | 1770 | p = event_next_pending(e); |
da7e457c LP |
1771 | if (!p) { |
1772 | r = 0; | |
1773 | goto finish; | |
1774 | } | |
1775 | ||
1776 | r = source_dispatch(p); | |
fd38203a | 1777 | |
da7e457c LP |
1778 | finish: |
1779 | e->state = SD_EVENT_PASSIVE; | |
1780 | sd_event_unref(e); | |
1781 | ||
1782 | return r; | |
fd38203a LP |
1783 | } |
1784 | ||
1785 | int sd_event_loop(sd_event *e) { | |
1786 | int r; | |
1787 | ||
da7e457c LP |
1788 | assert_return(e, -EINVAL); |
1789 | assert_return(!event_pid_changed(e), -ECHILD); | |
1790 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
1791 | ||
1792 | sd_event_ref(e); | |
fd38203a | 1793 | |
da7e457c | 1794 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
1795 | r = sd_event_run(e, (uint64_t) -1); |
1796 | if (r < 0) | |
da7e457c | 1797 | goto finish; |
fd38203a LP |
1798 | } |
1799 | ||
da7e457c LP |
1800 | r = 0; |
1801 | ||
1802 | finish: | |
1803 | sd_event_unref(e); | |
1804 | return r; | |
fd38203a LP |
1805 | } |
1806 | ||
da7e457c LP |
1807 | int sd_event_get_state(sd_event *e) { |
1808 | assert_return(e, -EINVAL); | |
1809 | assert_return(!event_pid_changed(e), -ECHILD); | |
1810 | ||
1811 | return e->state; | |
1812 | } | |
1813 | ||
1814 | int sd_event_get_quit(sd_event *e) { | |
1815 | assert_return(e, -EINVAL); | |
1816 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 1817 | |
da7e457c | 1818 | return e->quit_requested; |
fd38203a LP |
1819 | } |
1820 | ||
1821 | int sd_event_request_quit(sd_event *e) { | |
da7e457c LP |
1822 | assert_return(e, -EINVAL); |
1823 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1824 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 1825 | |
da7e457c | 1826 | e->quit_requested = true; |
fd38203a LP |
1827 | return 0; |
1828 | } | |
46e8c825 LP |
1829 | |
1830 | int sd_event_get_now_realtime(sd_event *e, uint64_t *usec) { | |
1831 | assert_return(e, -EINVAL); | |
1832 | assert_return(usec, -EINVAL); | |
1833 | assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA); | |
1834 | assert_return(!event_pid_changed(e), -ECHILD); | |
1835 | ||
1836 | *usec = e->timestamp.realtime; | |
1837 | return 0; | |
1838 | } | |
1839 | ||
1840 | int sd_event_get_now_monotonic(sd_event *e, uint64_t *usec) { | |
1841 | assert_return(e, -EINVAL); | |
1842 | assert_return(usec, -EINVAL); | |
1843 | assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA); | |
1844 | assert_return(!event_pid_changed(e), -ECHILD); | |
1845 | ||
1846 | *usec = e->timestamp.monotonic; | |
1847 | return 0; | |
1848 | } |