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fd38203a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/epoll.h> | |
23 | #include <sys/timerfd.h> | |
24 | #include <sys/wait.h> | |
25 | ||
afc6adb5 | 26 | #include "sd-id128.h" |
fd38203a | 27 | #include "macro.h" |
fd38203a LP |
28 | #include "prioq.h" |
29 | #include "hashmap.h" | |
30 | #include "util.h" | |
31 | #include "time-util.h" | |
afc6adb5 | 32 | #include "missing.h" |
fd38203a LP |
33 | |
34 | #include "sd-event.h" | |
35 | ||
36 | #define EPOLL_QUEUE_MAX 64 | |
c2ba3ad6 | 37 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
38 | |
39 | typedef enum EventSourceType { | |
40 | SOURCE_IO, | |
41 | SOURCE_MONOTONIC, | |
42 | SOURCE_REALTIME, | |
43 | SOURCE_SIGNAL, | |
44 | SOURCE_CHILD, | |
da7e457c LP |
45 | SOURCE_DEFER, |
46 | SOURCE_QUIT | |
fd38203a LP |
47 | } EventSourceType; |
48 | ||
49 | struct sd_event_source { | |
da7e457c | 50 | unsigned n_ref; |
fd38203a LP |
51 | |
52 | sd_event *event; | |
53 | void *userdata; | |
718db961 | 54 | sd_event_handler_t prepare; |
fd38203a LP |
55 | |
56 | EventSourceType type:4; | |
baf76283 | 57 | int enabled:3; |
fd38203a LP |
58 | bool pending:1; |
59 | ||
60 | int priority; | |
61 | unsigned pending_index; | |
62 | unsigned prepare_index; | |
63 | unsigned pending_iteration; | |
64 | unsigned prepare_iteration; | |
65 | ||
66 | union { | |
67 | struct { | |
718db961 | 68 | sd_event_io_handler_t callback; |
fd38203a LP |
69 | int fd; |
70 | uint32_t events; | |
71 | uint32_t revents; | |
72 | bool registered:1; | |
73 | } io; | |
74 | struct { | |
718db961 | 75 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
76 | usec_t next, accuracy; |
77 | unsigned earliest_index; | |
78 | unsigned latest_index; | |
fd38203a LP |
79 | } time; |
80 | struct { | |
718db961 | 81 | sd_event_signal_handler_t callback; |
fd38203a LP |
82 | struct signalfd_siginfo siginfo; |
83 | int sig; | |
84 | } signal; | |
85 | struct { | |
718db961 | 86 | sd_event_child_handler_t callback; |
fd38203a LP |
87 | siginfo_t siginfo; |
88 | pid_t pid; | |
89 | int options; | |
90 | } child; | |
91 | struct { | |
718db961 | 92 | sd_event_handler_t callback; |
fd38203a | 93 | } defer; |
da7e457c | 94 | struct { |
718db961 | 95 | sd_event_handler_t callback; |
da7e457c LP |
96 | unsigned prioq_index; |
97 | } quit; | |
fd38203a LP |
98 | }; |
99 | }; | |
100 | ||
101 | struct sd_event { | |
da7e457c | 102 | unsigned n_ref; |
fd38203a LP |
103 | |
104 | int epoll_fd; | |
105 | int signal_fd; | |
106 | int realtime_fd; | |
107 | int monotonic_fd; | |
108 | ||
109 | Prioq *pending; | |
110 | Prioq *prepare; | |
c2ba3ad6 LP |
111 | |
112 | /* For both clocks we maintain two priority queues each, one | |
113 | * ordered for the earliest times the events may be | |
114 | * dispatched, and one ordered by the latest times they must | |
115 | * have been dispatched. The range between the top entries in | |
116 | * the two prioqs is the time window we can freely schedule | |
117 | * wakeups in */ | |
118 | Prioq *monotonic_earliest; | |
119 | Prioq *monotonic_latest; | |
120 | Prioq *realtime_earliest; | |
121 | Prioq *realtime_latest; | |
fd38203a | 122 | |
da7e457c LP |
123 | usec_t realtime_next, monotonic_next; |
124 | usec_t perturb; | |
125 | ||
fd38203a LP |
126 | sigset_t sigset; |
127 | sd_event_source **signal_sources; | |
128 | ||
129 | Hashmap *child_sources; | |
baf76283 | 130 | unsigned n_enabled_child_sources; |
fd38203a | 131 | |
da7e457c | 132 | Prioq *quit; |
fd38203a | 133 | |
da7e457c | 134 | pid_t original_pid; |
c2ba3ad6 | 135 | |
da7e457c | 136 | unsigned iteration; |
46e8c825 | 137 | dual_timestamp timestamp; |
da7e457c | 138 | int state; |
eaa3cbef | 139 | |
da7e457c LP |
140 | bool quit_requested:1; |
141 | bool need_process_child:1; | |
afc6adb5 LP |
142 | |
143 | pid_t tid; | |
144 | sd_event **default_event_ptr; | |
fd38203a LP |
145 | }; |
146 | ||
147 | static int pending_prioq_compare(const void *a, const void *b) { | |
148 | const sd_event_source *x = a, *y = b; | |
149 | ||
150 | assert(x->pending); | |
151 | assert(y->pending); | |
152 | ||
baf76283 LP |
153 | /* Enabled ones first */ |
154 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 155 | return -1; |
baf76283 | 156 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
157 | return 1; |
158 | ||
159 | /* Lower priority values first */ | |
160 | if (x->priority < y->priority) | |
161 | return -1; | |
162 | if (x->priority > y->priority) | |
163 | return 1; | |
164 | ||
165 | /* Older entries first */ | |
166 | if (x->pending_iteration < y->pending_iteration) | |
167 | return -1; | |
168 | if (x->pending_iteration > y->pending_iteration) | |
169 | return 1; | |
170 | ||
171 | /* Stability for the rest */ | |
172 | if (x < y) | |
173 | return -1; | |
dfcd88f6 | 174 | if (x > y) |
fd38203a LP |
175 | return 1; |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | static int prepare_prioq_compare(const void *a, const void *b) { | |
181 | const sd_event_source *x = a, *y = b; | |
182 | ||
183 | assert(x->prepare); | |
184 | assert(y->prepare); | |
185 | ||
186 | /* Move most recently prepared ones last, so that we can stop | |
187 | * preparing as soon as we hit one that has already been | |
188 | * prepared in the current iteration */ | |
189 | if (x->prepare_iteration < y->prepare_iteration) | |
190 | return -1; | |
191 | if (x->prepare_iteration > y->prepare_iteration) | |
192 | return 1; | |
193 | ||
baf76283 LP |
194 | /* Enabled ones first */ |
195 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 196 | return -1; |
baf76283 | 197 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
198 | return 1; |
199 | ||
200 | /* Lower priority values first */ | |
201 | if (x->priority < y->priority) | |
202 | return -1; | |
203 | if (x->priority > y->priority) | |
204 | return 1; | |
205 | ||
206 | /* Stability for the rest */ | |
207 | if (x < y) | |
208 | return -1; | |
dfcd88f6 | 209 | if (x > y) |
fd38203a LP |
210 | return 1; |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
c2ba3ad6 | 215 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
216 | const sd_event_source *x = a, *y = b; |
217 | ||
218 | assert(x->type == SOURCE_MONOTONIC || x->type == SOURCE_REALTIME); | |
219 | assert(y->type == SOURCE_MONOTONIC || y->type == SOURCE_REALTIME); | |
220 | ||
baf76283 LP |
221 | /* Enabled ones first */ |
222 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 223 | return -1; |
baf76283 | 224 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
225 | return 1; |
226 | ||
227 | /* Move the pending ones to the end */ | |
228 | if (!x->pending && y->pending) | |
229 | return -1; | |
230 | if (x->pending && !y->pending) | |
231 | return 1; | |
232 | ||
233 | /* Order by time */ | |
234 | if (x->time.next < y->time.next) | |
235 | return -1; | |
236 | if (x->time.next > y->time.next) | |
a99badf5 | 237 | return 1; |
fd38203a LP |
238 | |
239 | /* Stability for the rest */ | |
240 | if (x < y) | |
241 | return -1; | |
dfcd88f6 | 242 | if (x > y) |
fd38203a LP |
243 | return 1; |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
c2ba3ad6 LP |
248 | static int latest_time_prioq_compare(const void *a, const void *b) { |
249 | const sd_event_source *x = a, *y = b; | |
250 | ||
da7e457c LP |
251 | assert((x->type == SOURCE_MONOTONIC && y->type == SOURCE_MONOTONIC) || |
252 | (x->type == SOURCE_REALTIME && y->type == SOURCE_REALTIME)); | |
c2ba3ad6 | 253 | |
baf76283 LP |
254 | /* Enabled ones first */ |
255 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 256 | return -1; |
baf76283 | 257 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
258 | return 1; |
259 | ||
260 | /* Move the pending ones to the end */ | |
261 | if (!x->pending && y->pending) | |
262 | return -1; | |
263 | if (x->pending && !y->pending) | |
264 | return 1; | |
265 | ||
266 | /* Order by time */ | |
267 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
268 | return -1; | |
269 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
a99badf5 | 270 | return 1; |
c2ba3ad6 LP |
271 | |
272 | /* Stability for the rest */ | |
273 | if (x < y) | |
274 | return -1; | |
275 | if (x > y) | |
276 | return 1; | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
da7e457c LP |
281 | static int quit_prioq_compare(const void *a, const void *b) { |
282 | const sd_event_source *x = a, *y = b; | |
283 | ||
284 | assert(x->type == SOURCE_QUIT); | |
285 | assert(y->type == SOURCE_QUIT); | |
286 | ||
baf76283 LP |
287 | /* Enabled ones first */ |
288 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 289 | return -1; |
baf76283 | 290 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
291 | return 1; |
292 | ||
293 | /* Lower priority values first */ | |
294 | if (x->priority < y->priority) | |
295 | return -1; | |
296 | if (x->priority > y->priority) | |
297 | return 1; | |
298 | ||
299 | /* Stability for the rest */ | |
300 | if (x < y) | |
301 | return -1; | |
302 | if (x > y) | |
303 | return 1; | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
fd38203a LP |
308 | static void event_free(sd_event *e) { |
309 | assert(e); | |
310 | ||
afc6adb5 LP |
311 | if (e->default_event_ptr) |
312 | *(e->default_event_ptr) = NULL; | |
313 | ||
fd38203a LP |
314 | if (e->epoll_fd >= 0) |
315 | close_nointr_nofail(e->epoll_fd); | |
316 | ||
317 | if (e->signal_fd >= 0) | |
318 | close_nointr_nofail(e->signal_fd); | |
319 | ||
320 | if (e->realtime_fd >= 0) | |
321 | close_nointr_nofail(e->realtime_fd); | |
322 | ||
323 | if (e->monotonic_fd >= 0) | |
324 | close_nointr_nofail(e->monotonic_fd); | |
325 | ||
326 | prioq_free(e->pending); | |
327 | prioq_free(e->prepare); | |
c2ba3ad6 LP |
328 | prioq_free(e->monotonic_earliest); |
329 | prioq_free(e->monotonic_latest); | |
330 | prioq_free(e->realtime_earliest); | |
331 | prioq_free(e->realtime_latest); | |
da7e457c | 332 | prioq_free(e->quit); |
fd38203a LP |
333 | |
334 | free(e->signal_sources); | |
335 | ||
336 | hashmap_free(e->child_sources); | |
337 | free(e); | |
338 | } | |
339 | ||
f7262a9f | 340 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
341 | sd_event *e; |
342 | int r; | |
343 | ||
305f78bf | 344 | assert_return(ret, -EINVAL); |
fd38203a LP |
345 | |
346 | e = new0(sd_event, 1); | |
347 | if (!e) | |
348 | return -ENOMEM; | |
349 | ||
da7e457c | 350 | e->n_ref = 1; |
fd38203a LP |
351 | e->signal_fd = e->realtime_fd = e->monotonic_fd = e->epoll_fd = -1; |
352 | e->realtime_next = e->monotonic_next = (usec_t) -1; | |
eaa3cbef | 353 | e->original_pid = getpid(); |
fd38203a LP |
354 | |
355 | assert_se(sigemptyset(&e->sigset) == 0); | |
356 | ||
357 | e->pending = prioq_new(pending_prioq_compare); | |
358 | if (!e->pending) { | |
359 | r = -ENOMEM; | |
360 | goto fail; | |
361 | } | |
362 | ||
363 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
364 | if (e->epoll_fd < 0) { | |
365 | r = -errno; | |
366 | goto fail; | |
367 | } | |
368 | ||
369 | *ret = e; | |
370 | return 0; | |
371 | ||
372 | fail: | |
373 | event_free(e); | |
374 | return r; | |
375 | } | |
376 | ||
f7262a9f | 377 | _public_ sd_event* sd_event_ref(sd_event *e) { |
305f78bf | 378 | assert_return(e, NULL); |
fd38203a | 379 | |
da7e457c LP |
380 | assert(e->n_ref >= 1); |
381 | e->n_ref++; | |
fd38203a LP |
382 | |
383 | return e; | |
384 | } | |
385 | ||
f7262a9f | 386 | _public_ sd_event* sd_event_unref(sd_event *e) { |
305f78bf | 387 | assert_return(e, NULL); |
fd38203a | 388 | |
da7e457c LP |
389 | assert(e->n_ref >= 1); |
390 | e->n_ref--; | |
391 | ||
392 | if (e->n_ref <= 0) | |
fd38203a LP |
393 | event_free(e); |
394 | ||
395 | return NULL; | |
396 | } | |
397 | ||
eaa3cbef LP |
398 | static bool event_pid_changed(sd_event *e) { |
399 | assert(e); | |
400 | ||
401 | /* We don't support people creating am event loop and keeping | |
402 | * it around over a fork(). Let's complain. */ | |
403 | ||
404 | return e->original_pid != getpid(); | |
405 | } | |
406 | ||
fd38203a LP |
407 | static int source_io_unregister(sd_event_source *s) { |
408 | int r; | |
409 | ||
410 | assert(s); | |
411 | assert(s->type == SOURCE_IO); | |
412 | ||
413 | if (!s->io.registered) | |
414 | return 0; | |
415 | ||
416 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
417 | if (r < 0) | |
418 | return -errno; | |
419 | ||
420 | s->io.registered = false; | |
421 | return 0; | |
422 | } | |
423 | ||
305f78bf LP |
424 | static int source_io_register( |
425 | sd_event_source *s, | |
426 | int enabled, | |
427 | uint32_t events) { | |
428 | ||
fd38203a LP |
429 | struct epoll_event ev = {}; |
430 | int r; | |
431 | ||
432 | assert(s); | |
433 | assert(s->type == SOURCE_IO); | |
baf76283 | 434 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
435 | |
436 | ev.events = events; | |
437 | ev.data.ptr = s; | |
438 | ||
baf76283 | 439 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
440 | ev.events |= EPOLLONESHOT; |
441 | ||
442 | if (s->io.registered) | |
443 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
444 | else | |
445 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
446 | ||
447 | if (r < 0) | |
448 | return -errno; | |
449 | ||
450 | s->io.registered = true; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | static void source_free(sd_event_source *s) { | |
456 | assert(s); | |
457 | ||
458 | if (s->event) { | |
459 | switch (s->type) { | |
460 | ||
461 | case SOURCE_IO: | |
462 | if (s->io.fd >= 0) | |
463 | source_io_unregister(s); | |
464 | ||
465 | break; | |
466 | ||
467 | case SOURCE_MONOTONIC: | |
c2ba3ad6 LP |
468 | prioq_remove(s->event->monotonic_earliest, s, &s->time.earliest_index); |
469 | prioq_remove(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
470 | break; |
471 | ||
472 | case SOURCE_REALTIME: | |
c2ba3ad6 LP |
473 | prioq_remove(s->event->realtime_earliest, s, &s->time.earliest_index); |
474 | prioq_remove(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
475 | break; |
476 | ||
477 | case SOURCE_SIGNAL: | |
478 | if (s->signal.sig > 0) { | |
baf76283 | 479 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) |
fd38203a LP |
480 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
481 | ||
482 | if (s->event->signal_sources) | |
483 | s->event->signal_sources[s->signal.sig] = NULL; | |
484 | } | |
485 | ||
486 | break; | |
487 | ||
488 | case SOURCE_CHILD: | |
489 | if (s->child.pid > 0) { | |
baf76283 LP |
490 | if (s->enabled != SD_EVENT_OFF) { |
491 | assert(s->event->n_enabled_child_sources > 0); | |
492 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
493 | } |
494 | ||
495 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) | |
496 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
497 | ||
498 | hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid)); | |
499 | } | |
500 | ||
501 | break; | |
da7e457c | 502 | |
0eb2e0e3 ZJS |
503 | case SOURCE_DEFER: |
504 | /* nothing */ | |
505 | break; | |
506 | ||
da7e457c LP |
507 | case SOURCE_QUIT: |
508 | prioq_remove(s->event->quit, s, &s->quit.prioq_index); | |
509 | break; | |
fd38203a LP |
510 | } |
511 | ||
512 | if (s->pending) | |
513 | prioq_remove(s->event->pending, s, &s->pending_index); | |
514 | ||
515 | if (s->prepare) | |
516 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
517 | ||
518 | sd_event_unref(s->event); | |
519 | } | |
520 | ||
521 | free(s); | |
522 | } | |
523 | ||
524 | static int source_set_pending(sd_event_source *s, bool b) { | |
525 | int r; | |
526 | ||
527 | assert(s); | |
da7e457c | 528 | assert(s->type != SOURCE_QUIT); |
fd38203a LP |
529 | |
530 | if (s->pending == b) | |
531 | return 0; | |
532 | ||
533 | s->pending = b; | |
534 | ||
535 | if (b) { | |
536 | s->pending_iteration = s->event->iteration; | |
537 | ||
538 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
539 | if (r < 0) { | |
540 | s->pending = false; | |
541 | return r; | |
542 | } | |
543 | } else | |
544 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
545 | ||
2576a19e LP |
546 | if (s->type == SOURCE_REALTIME) { |
547 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); | |
548 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
549 | } else if (s->type == SOURCE_MONOTONIC) { | |
550 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); | |
551 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
552 | } | |
553 | ||
fd38203a LP |
554 | return 0; |
555 | } | |
556 | ||
557 | static sd_event_source *source_new(sd_event *e, EventSourceType type) { | |
558 | sd_event_source *s; | |
559 | ||
560 | assert(e); | |
561 | ||
562 | s = new0(sd_event_source, 1); | |
563 | if (!s) | |
564 | return NULL; | |
565 | ||
da7e457c | 566 | s->n_ref = 1; |
fd38203a LP |
567 | s->event = sd_event_ref(e); |
568 | s->type = type; | |
fd38203a LP |
569 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
570 | ||
571 | return s; | |
572 | } | |
573 | ||
f7262a9f | 574 | _public_ int sd_event_add_io( |
fd38203a LP |
575 | sd_event *e, |
576 | int fd, | |
577 | uint32_t events, | |
718db961 | 578 | sd_event_io_handler_t callback, |
fd38203a LP |
579 | void *userdata, |
580 | sd_event_source **ret) { | |
581 | ||
582 | sd_event_source *s; | |
583 | int r; | |
584 | ||
305f78bf LP |
585 | assert_return(e, -EINVAL); |
586 | assert_return(fd >= 0, -EINVAL); | |
587 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP)), -EINVAL); | |
588 | assert_return(callback, -EINVAL); | |
589 | assert_return(ret, -EINVAL); | |
da7e457c | 590 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 591 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
592 | |
593 | s = source_new(e, SOURCE_IO); | |
594 | if (!s) | |
595 | return -ENOMEM; | |
596 | ||
597 | s->io.fd = fd; | |
598 | s->io.events = events; | |
599 | s->io.callback = callback; | |
600 | s->userdata = userdata; | |
baf76283 | 601 | s->enabled = SD_EVENT_ON; |
fd38203a | 602 | |
baf76283 | 603 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
604 | if (r < 0) { |
605 | source_free(s); | |
606 | return -errno; | |
607 | } | |
608 | ||
609 | *ret = s; | |
610 | return 0; | |
611 | } | |
612 | ||
613 | static int event_setup_timer_fd( | |
614 | sd_event *e, | |
615 | EventSourceType type, | |
616 | int *timer_fd, | |
617 | clockid_t id) { | |
618 | ||
619 | struct epoll_event ev = {}; | |
620 | int r, fd; | |
c2ba3ad6 | 621 | sd_id128_t bootid; |
fd38203a LP |
622 | |
623 | assert(e); | |
624 | assert(timer_fd); | |
625 | ||
626 | if (_likely_(*timer_fd >= 0)) | |
627 | return 0; | |
628 | ||
629 | fd = timerfd_create(id, TFD_NONBLOCK|TFD_CLOEXEC); | |
630 | if (fd < 0) | |
631 | return -errno; | |
632 | ||
633 | ev.events = EPOLLIN; | |
634 | ev.data.ptr = INT_TO_PTR(type); | |
635 | ||
636 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
637 | if (r < 0) { | |
638 | close_nointr_nofail(fd); | |
639 | return -errno; | |
640 | } | |
641 | ||
c2ba3ad6 | 642 | /* When we sleep for longer, we try to realign the wakeup to |
850516e0 LP |
643 | the same time wihtin each minute/second/250ms, so that |
644 | events all across the system can be coalesced into a single | |
645 | CPU wakeup. However, let's take some system-specific | |
646 | randomness for this value, so that in a network of systems | |
647 | with synced clocks timer events are distributed a | |
648 | bit. Here, we calculate a perturbation usec offset from the | |
649 | boot ID. */ | |
c2ba3ad6 LP |
650 | |
651 | if (sd_id128_get_boot(&bootid) >= 0) | |
850516e0 | 652 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; |
c2ba3ad6 | 653 | |
fd38203a LP |
654 | *timer_fd = fd; |
655 | return 0; | |
656 | } | |
657 | ||
658 | static int event_add_time_internal( | |
659 | sd_event *e, | |
660 | EventSourceType type, | |
661 | int *timer_fd, | |
662 | clockid_t id, | |
c2ba3ad6 LP |
663 | Prioq **earliest, |
664 | Prioq **latest, | |
fd38203a | 665 | uint64_t usec, |
c2ba3ad6 | 666 | uint64_t accuracy, |
718db961 | 667 | sd_event_time_handler_t callback, |
fd38203a LP |
668 | void *userdata, |
669 | sd_event_source **ret) { | |
670 | ||
671 | sd_event_source *s; | |
672 | int r; | |
673 | ||
305f78bf LP |
674 | assert_return(e, -EINVAL); |
675 | assert_return(callback, -EINVAL); | |
676 | assert_return(ret, -EINVAL); | |
677 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
678 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
da7e457c | 679 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 680 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
681 | |
682 | assert(timer_fd); | |
c2ba3ad6 LP |
683 | assert(earliest); |
684 | assert(latest); | |
685 | ||
686 | if (!*earliest) { | |
687 | *earliest = prioq_new(earliest_time_prioq_compare); | |
688 | if (!*earliest) | |
689 | return -ENOMEM; | |
690 | } | |
fd38203a | 691 | |
c2ba3ad6 LP |
692 | if (!*latest) { |
693 | *latest = prioq_new(latest_time_prioq_compare); | |
694 | if (!*latest) | |
fd38203a LP |
695 | return -ENOMEM; |
696 | } | |
697 | ||
698 | if (*timer_fd < 0) { | |
699 | r = event_setup_timer_fd(e, type, timer_fd, id); | |
700 | if (r < 0) | |
701 | return r; | |
702 | } | |
703 | ||
704 | s = source_new(e, type); | |
705 | if (!s) | |
706 | return -ENOMEM; | |
707 | ||
708 | s->time.next = usec; | |
c2ba3ad6 | 709 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 710 | s->time.callback = callback; |
da7e457c | 711 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 712 | s->userdata = userdata; |
baf76283 | 713 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 714 | |
c2ba3ad6 LP |
715 | r = prioq_put(*earliest, s, &s->time.earliest_index); |
716 | if (r < 0) | |
717 | goto fail; | |
718 | ||
719 | r = prioq_put(*latest, s, &s->time.latest_index); | |
720 | if (r < 0) | |
721 | goto fail; | |
fd38203a LP |
722 | |
723 | *ret = s; | |
724 | return 0; | |
c2ba3ad6 LP |
725 | |
726 | fail: | |
727 | source_free(s); | |
728 | return r; | |
fd38203a LP |
729 | } |
730 | ||
f7262a9f ZJS |
731 | _public_ int sd_event_add_monotonic(sd_event *e, |
732 | uint64_t usec, | |
733 | uint64_t accuracy, | |
718db961 | 734 | sd_event_time_handler_t callback, |
f7262a9f ZJS |
735 | void *userdata, |
736 | sd_event_source **ret) { | |
737 | ||
c2ba3ad6 | 738 | 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 |
739 | } |
740 | ||
f7262a9f ZJS |
741 | _public_ int sd_event_add_realtime(sd_event *e, |
742 | uint64_t usec, | |
743 | uint64_t accuracy, | |
718db961 | 744 | sd_event_time_handler_t callback, |
f7262a9f ZJS |
745 | void *userdata, |
746 | sd_event_source **ret) { | |
747 | ||
c2ba3ad6 | 748 | 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 |
749 | } |
750 | ||
751 | static int event_update_signal_fd(sd_event *e) { | |
752 | struct epoll_event ev = {}; | |
753 | bool add_to_epoll; | |
754 | int r; | |
755 | ||
756 | assert(e); | |
757 | ||
758 | add_to_epoll = e->signal_fd < 0; | |
759 | ||
760 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
761 | if (r < 0) | |
762 | return -errno; | |
763 | ||
764 | e->signal_fd = r; | |
765 | ||
766 | if (!add_to_epoll) | |
767 | return 0; | |
768 | ||
769 | ev.events = EPOLLIN; | |
770 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
771 | ||
772 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
773 | if (r < 0) { | |
774 | close_nointr_nofail(e->signal_fd); | |
775 | e->signal_fd = -1; | |
776 | ||
777 | return -errno; | |
778 | } | |
779 | ||
780 | return 0; | |
781 | } | |
782 | ||
f7262a9f | 783 | _public_ int sd_event_add_signal( |
305f78bf LP |
784 | sd_event *e, |
785 | int sig, | |
718db961 | 786 | sd_event_signal_handler_t callback, |
305f78bf LP |
787 | void *userdata, |
788 | sd_event_source **ret) { | |
789 | ||
fd38203a LP |
790 | sd_event_source *s; |
791 | int r; | |
792 | ||
305f78bf LP |
793 | assert_return(e, -EINVAL); |
794 | assert_return(sig > 0, -EINVAL); | |
795 | assert_return(sig < _NSIG, -EINVAL); | |
796 | assert_return(callback, -EINVAL); | |
797 | assert_return(ret, -EINVAL); | |
da7e457c | 798 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 799 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
800 | |
801 | if (!e->signal_sources) { | |
802 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
803 | if (!e->signal_sources) | |
804 | return -ENOMEM; | |
805 | } else if (e->signal_sources[sig]) | |
806 | return -EBUSY; | |
807 | ||
808 | s = source_new(e, SOURCE_SIGNAL); | |
809 | if (!s) | |
810 | return -ENOMEM; | |
811 | ||
812 | s->signal.sig = sig; | |
813 | s->signal.callback = callback; | |
814 | s->userdata = userdata; | |
baf76283 | 815 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
816 | |
817 | e->signal_sources[sig] = s; | |
818 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
819 | ||
baf76283 | 820 | if (sig != SIGCHLD || e->n_enabled_child_sources == 0) { |
fd38203a LP |
821 | r = event_update_signal_fd(e); |
822 | if (r < 0) { | |
823 | source_free(s); | |
824 | return r; | |
825 | } | |
826 | } | |
827 | ||
828 | *ret = s; | |
829 | return 0; | |
830 | } | |
831 | ||
f7262a9f | 832 | _public_ int sd_event_add_child( |
305f78bf LP |
833 | sd_event *e, |
834 | pid_t pid, | |
835 | int options, | |
718db961 | 836 | sd_event_child_handler_t callback, |
305f78bf LP |
837 | void *userdata, |
838 | sd_event_source **ret) { | |
839 | ||
fd38203a LP |
840 | sd_event_source *s; |
841 | int r; | |
842 | ||
305f78bf LP |
843 | assert_return(e, -EINVAL); |
844 | assert_return(pid > 1, -EINVAL); | |
845 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
846 | assert_return(options != 0, -EINVAL); | |
847 | assert_return(callback, -EINVAL); | |
848 | assert_return(ret, -EINVAL); | |
da7e457c | 849 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 850 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
851 | |
852 | r = hashmap_ensure_allocated(&e->child_sources, trivial_hash_func, trivial_compare_func); | |
853 | if (r < 0) | |
854 | return r; | |
855 | ||
856 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
857 | return -EBUSY; | |
858 | ||
859 | s = source_new(e, SOURCE_CHILD); | |
860 | if (!s) | |
861 | return -ENOMEM; | |
862 | ||
863 | s->child.pid = pid; | |
864 | s->child.options = options; | |
865 | s->child.callback = callback; | |
866 | s->userdata = userdata; | |
baf76283 | 867 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
868 | |
869 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
870 | if (r < 0) { | |
871 | source_free(s); | |
872 | return r; | |
873 | } | |
874 | ||
baf76283 | 875 | e->n_enabled_child_sources ++; |
fd38203a LP |
876 | |
877 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
878 | ||
879 | if (!e->signal_sources || !e->signal_sources[SIGCHLD]) { | |
880 | r = event_update_signal_fd(e); | |
881 | if (r < 0) { | |
882 | source_free(s); | |
883 | return -errno; | |
884 | } | |
885 | } | |
886 | ||
c2ba3ad6 LP |
887 | e->need_process_child = true; |
888 | ||
fd38203a LP |
889 | *ret = s; |
890 | return 0; | |
891 | } | |
892 | ||
f7262a9f | 893 | _public_ int sd_event_add_defer( |
305f78bf | 894 | sd_event *e, |
718db961 | 895 | sd_event_handler_t callback, |
305f78bf LP |
896 | void *userdata, |
897 | sd_event_source **ret) { | |
898 | ||
fd38203a LP |
899 | sd_event_source *s; |
900 | int r; | |
901 | ||
305f78bf LP |
902 | assert_return(e, -EINVAL); |
903 | assert_return(callback, -EINVAL); | |
904 | assert_return(ret, -EINVAL); | |
da7e457c | 905 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 906 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
907 | |
908 | s = source_new(e, SOURCE_DEFER); | |
909 | if (!s) | |
910 | return -ENOMEM; | |
911 | ||
912 | s->defer.callback = callback; | |
913 | s->userdata = userdata; | |
baf76283 | 914 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
915 | |
916 | r = source_set_pending(s, true); | |
917 | if (r < 0) { | |
918 | source_free(s); | |
919 | return r; | |
920 | } | |
921 | ||
922 | *ret = s; | |
923 | return 0; | |
924 | } | |
925 | ||
f7262a9f | 926 | _public_ int sd_event_add_quit( |
305f78bf | 927 | sd_event *e, |
718db961 | 928 | sd_event_handler_t callback, |
305f78bf LP |
929 | void *userdata, |
930 | sd_event_source **ret) { | |
931 | ||
da7e457c LP |
932 | sd_event_source *s; |
933 | int r; | |
934 | ||
935 | assert_return(e, -EINVAL); | |
936 | assert_return(callback, -EINVAL); | |
305f78bf | 937 | assert_return(ret, -EINVAL); |
da7e457c LP |
938 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
939 | assert_return(!event_pid_changed(e), -ECHILD); | |
940 | ||
941 | if (!e->quit) { | |
942 | e->quit = prioq_new(quit_prioq_compare); | |
943 | if (!e->quit) | |
944 | return -ENOMEM; | |
945 | } | |
946 | ||
947 | s = source_new(e, SOURCE_QUIT); | |
fd38203a | 948 | if (!s) |
da7e457c | 949 | return -ENOMEM; |
fd38203a | 950 | |
da7e457c LP |
951 | s->quit.callback = callback; |
952 | s->userdata = userdata; | |
953 | s->quit.prioq_index = PRIOQ_IDX_NULL; | |
baf76283 | 954 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c LP |
955 | |
956 | r = prioq_put(s->event->quit, s, &s->quit.prioq_index); | |
957 | if (r < 0) { | |
958 | source_free(s); | |
959 | return r; | |
960 | } | |
961 | ||
962 | *ret = s; | |
963 | return 0; | |
964 | } | |
965 | ||
f7262a9f | 966 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
da7e457c LP |
967 | assert_return(s, NULL); |
968 | ||
969 | assert(s->n_ref >= 1); | |
970 | s->n_ref++; | |
fd38203a LP |
971 | |
972 | return s; | |
973 | } | |
974 | ||
f7262a9f | 975 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
da7e457c | 976 | assert_return(s, NULL); |
fd38203a | 977 | |
da7e457c LP |
978 | assert(s->n_ref >= 1); |
979 | s->n_ref--; | |
980 | ||
981 | if (s->n_ref <= 0) | |
fd38203a LP |
982 | source_free(s); |
983 | ||
984 | return NULL; | |
985 | } | |
986 | ||
f7262a9f | 987 | _public_ sd_event *sd_event_get(sd_event_source *s) { |
305f78bf | 988 | assert_return(s, NULL); |
eaa3cbef LP |
989 | |
990 | return s->event; | |
991 | } | |
992 | ||
f7262a9f | 993 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf LP |
994 | assert_return(s, -EINVAL); |
995 | assert_return(s->type != SOURCE_QUIT, -EDOM); | |
da7e457c | 996 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 997 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
998 | |
999 | return s->pending; | |
1000 | } | |
1001 | ||
f7262a9f | 1002 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1003 | assert_return(s, -EINVAL); |
1004 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1005 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1006 | |
1007 | return s->io.fd; | |
1008 | } | |
1009 | ||
f7262a9f | 1010 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1011 | assert_return(s, -EINVAL); |
1012 | assert_return(events, -EINVAL); | |
1013 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1014 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1015 | |
1016 | *events = s->io.events; | |
1017 | return 0; | |
1018 | } | |
1019 | ||
f7262a9f | 1020 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1021 | int r; |
1022 | ||
305f78bf LP |
1023 | assert_return(s, -EINVAL); |
1024 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1025 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP)), -EINVAL); | |
da7e457c | 1026 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1027 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1028 | |
1029 | if (s->io.events == events) | |
1030 | return 0; | |
1031 | ||
baf76283 | 1032 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1033 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1034 | if (r < 0) |
1035 | return r; | |
1036 | } | |
1037 | ||
1038 | s->io.events = events; | |
503f39c3 | 1039 | source_set_pending(s, false); |
fd38203a LP |
1040 | |
1041 | return 0; | |
1042 | } | |
1043 | ||
f7262a9f | 1044 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1045 | assert_return(s, -EINVAL); |
1046 | assert_return(revents, -EINVAL); | |
1047 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1048 | assert_return(s->pending, -ENODATA); | |
1049 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1050 | |
1051 | *revents = s->io.revents; | |
1052 | return 0; | |
1053 | } | |
1054 | ||
f7262a9f | 1055 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1056 | assert_return(s, -EINVAL); |
1057 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1058 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1059 | |
1060 | return s->signal.sig; | |
1061 | } | |
1062 | ||
f7262a9f | 1063 | _public_ int sd_event_source_get_priority(sd_event_source *s, int *priority) { |
305f78bf LP |
1064 | assert_return(s, -EINVAL); |
1065 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1066 | |
1067 | return s->priority; | |
1068 | } | |
1069 | ||
f7262a9f | 1070 | _public_ int sd_event_source_set_priority(sd_event_source *s, int priority) { |
305f78bf | 1071 | assert_return(s, -EINVAL); |
da7e457c | 1072 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1073 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1074 | |
1075 | if (s->priority == priority) | |
1076 | return 0; | |
1077 | ||
1078 | s->priority = priority; | |
1079 | ||
1080 | if (s->pending) | |
c2ba3ad6 | 1081 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1082 | |
1083 | if (s->prepare) | |
c2ba3ad6 | 1084 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1085 | |
305f78bf LP |
1086 | if (s->type == SOURCE_QUIT) |
1087 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1088 | ||
fd38203a LP |
1089 | return 0; |
1090 | } | |
1091 | ||
f7262a9f | 1092 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1093 | assert_return(s, -EINVAL); |
1094 | assert_return(m, -EINVAL); | |
1095 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1096 | |
baf76283 | 1097 | *m = s->enabled; |
fd38203a LP |
1098 | return 0; |
1099 | } | |
1100 | ||
f7262a9f | 1101 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1102 | int r; |
1103 | ||
305f78bf LP |
1104 | assert_return(s, -EINVAL); |
1105 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
da7e457c | 1106 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1107 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1108 | |
baf76283 | 1109 | if (s->enabled == m) |
fd38203a LP |
1110 | return 0; |
1111 | ||
baf76283 | 1112 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1113 | |
1114 | switch (s->type) { | |
1115 | ||
1116 | case SOURCE_IO: | |
1117 | r = source_io_unregister(s); | |
1118 | if (r < 0) | |
1119 | return r; | |
1120 | ||
baf76283 | 1121 | s->enabled = m; |
fd38203a LP |
1122 | break; |
1123 | ||
1124 | case SOURCE_MONOTONIC: | |
baf76283 | 1125 | s->enabled = m; |
c2ba3ad6 LP |
1126 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); |
1127 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
1128 | break; |
1129 | ||
1130 | case SOURCE_REALTIME: | |
baf76283 | 1131 | s->enabled = m; |
c2ba3ad6 LP |
1132 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); |
1133 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
1134 | break; |
1135 | ||
1136 | case SOURCE_SIGNAL: | |
baf76283 LP |
1137 | s->enabled = m; |
1138 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { | |
fd38203a LP |
1139 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
1140 | event_update_signal_fd(s->event); | |
1141 | } | |
1142 | ||
1143 | break; | |
1144 | ||
1145 | case SOURCE_CHILD: | |
baf76283 | 1146 | s->enabled = m; |
fd38203a | 1147 | |
baf76283 LP |
1148 | assert(s->event->n_enabled_child_sources > 0); |
1149 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
1150 | |
1151 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1152 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
1153 | event_update_signal_fd(s->event); | |
1154 | } | |
1155 | ||
1156 | break; | |
1157 | ||
da7e457c | 1158 | case SOURCE_QUIT: |
305f78bf LP |
1159 | s->enabled = m; |
1160 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1161 | break; | |
1162 | ||
1163 | case SOURCE_DEFER: | |
baf76283 | 1164 | s->enabled = m; |
fd38203a LP |
1165 | break; |
1166 | } | |
1167 | ||
1168 | } else { | |
1169 | switch (s->type) { | |
1170 | ||
1171 | case SOURCE_IO: | |
1172 | r = source_io_register(s, m, s->io.events); | |
1173 | if (r < 0) | |
1174 | return r; | |
1175 | ||
baf76283 | 1176 | s->enabled = m; |
fd38203a LP |
1177 | break; |
1178 | ||
1179 | case SOURCE_MONOTONIC: | |
baf76283 | 1180 | s->enabled = m; |
c2ba3ad6 LP |
1181 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); |
1182 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
fd38203a LP |
1183 | break; |
1184 | ||
1185 | case SOURCE_REALTIME: | |
baf76283 | 1186 | s->enabled = m; |
c2ba3ad6 LP |
1187 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); |
1188 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
fd38203a LP |
1189 | break; |
1190 | ||
1191 | case SOURCE_SIGNAL: | |
baf76283 | 1192 | s->enabled = m; |
fd38203a | 1193 | |
baf76283 | 1194 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { |
fd38203a LP |
1195 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
1196 | event_update_signal_fd(s->event); | |
1197 | } | |
1198 | break; | |
1199 | ||
1200 | case SOURCE_CHILD: | |
baf76283 | 1201 | s->enabled = m; |
fd38203a | 1202 | |
baf76283 LP |
1203 | if (s->enabled == SD_EVENT_OFF) { |
1204 | s->event->n_enabled_child_sources++; | |
fd38203a LP |
1205 | |
1206 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1207 | assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0); | |
1208 | event_update_signal_fd(s->event); | |
1209 | } | |
1210 | } | |
1211 | break; | |
1212 | ||
da7e457c | 1213 | case SOURCE_QUIT: |
305f78bf LP |
1214 | s->enabled = m; |
1215 | prioq_reshuffle(s->event->quit, s, &s->quit.prioq_index); | |
1216 | break; | |
1217 | ||
1218 | case SOURCE_DEFER: | |
baf76283 | 1219 | s->enabled = m; |
fd38203a LP |
1220 | break; |
1221 | } | |
1222 | } | |
1223 | ||
1224 | if (s->pending) | |
1225 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1226 | ||
1227 | if (s->prepare) | |
1228 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1229 | ||
1230 | return 0; | |
1231 | } | |
1232 | ||
f7262a9f | 1233 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1234 | assert_return(s, -EINVAL); |
1235 | assert_return(usec, -EINVAL); | |
1236 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1237 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1238 | |
1239 | *usec = s->time.next; | |
1240 | return 0; | |
1241 | } | |
1242 | ||
f7262a9f | 1243 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
305f78bf LP |
1244 | assert_return(s, -EINVAL); |
1245 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1246 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1247 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1248 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1249 | |
fd38203a | 1250 | s->time.next = usec; |
2576a19e | 1251 | |
0cc1125a | 1252 | source_set_pending(s, false); |
fd38203a | 1253 | |
c2ba3ad6 LP |
1254 | if (s->type == SOURCE_REALTIME) { |
1255 | prioq_reshuffle(s->event->realtime_earliest, s, &s->time.earliest_index); | |
1256 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1257 | } else { | |
1258 | prioq_reshuffle(s->event->monotonic_earliest, s, &s->time.earliest_index); | |
1259 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1260 | } | |
fd38203a LP |
1261 | |
1262 | return 0; | |
1263 | } | |
1264 | ||
f7262a9f | 1265 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1266 | assert_return(s, -EINVAL); |
1267 | assert_return(usec, -EINVAL); | |
1268 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
1269 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1270 | ||
1271 | *usec = s->time.accuracy; | |
1272 | return 0; | |
1273 | } | |
1274 | ||
f7262a9f | 1275 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
305f78bf LP |
1276 | assert_return(s, -EINVAL); |
1277 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1278 | assert_return(s->type == SOURCE_REALTIME || s->type == SOURCE_MONOTONIC, -EDOM); | |
da7e457c | 1279 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1280 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1281 | |
1282 | if (usec == 0) | |
1283 | usec = DEFAULT_ACCURACY_USEC; | |
1284 | ||
eaa3cbef LP |
1285 | s->time.accuracy = usec; |
1286 | ||
2576a19e LP |
1287 | source_set_pending(s, false); |
1288 | ||
eaa3cbef LP |
1289 | if (s->type == SOURCE_REALTIME) |
1290 | prioq_reshuffle(s->event->realtime_latest, s, &s->time.latest_index); | |
1291 | else | |
1292 | prioq_reshuffle(s->event->monotonic_latest, s, &s->time.latest_index); | |
1293 | ||
1294 | return 0; | |
1295 | } | |
1296 | ||
f7262a9f | 1297 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1298 | assert_return(s, -EINVAL); |
1299 | assert_return(pid, -EINVAL); | |
1300 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1301 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1302 | ||
1303 | *pid = s->child.pid; | |
1304 | return 0; | |
1305 | } | |
1306 | ||
718db961 | 1307 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1308 | int r; |
1309 | ||
da7e457c LP |
1310 | assert_return(s, -EINVAL); |
1311 | assert_return(s->type != SOURCE_QUIT, -EDOM); | |
1312 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); | |
1313 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1314 | |
1315 | if (s->prepare == callback) | |
1316 | return 0; | |
1317 | ||
1318 | if (callback && s->prepare) { | |
1319 | s->prepare = callback; | |
1320 | return 0; | |
1321 | } | |
1322 | ||
1323 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1324 | if (r < 0) | |
1325 | return r; | |
1326 | ||
1327 | s->prepare = callback; | |
1328 | ||
1329 | if (callback) { | |
1330 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1331 | if (r < 0) | |
1332 | return r; | |
1333 | } else | |
1334 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1335 | ||
1336 | return 0; | |
1337 | } | |
1338 | ||
f7262a9f | 1339 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1340 | assert_return(s, NULL); |
fd38203a LP |
1341 | |
1342 | return s->userdata; | |
1343 | } | |
1344 | ||
c2ba3ad6 LP |
1345 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1346 | usec_t c; | |
1347 | assert(e); | |
1348 | assert(a <= b); | |
1349 | ||
1350 | if (a <= 0) | |
1351 | return 0; | |
1352 | ||
1353 | if (b <= a + 1) | |
1354 | return a; | |
1355 | ||
1356 | /* | |
1357 | Find a good time to wake up again between times a and b. We | |
1358 | have two goals here: | |
1359 | ||
1360 | a) We want to wake up as seldom as possible, hence prefer | |
1361 | later times over earlier times. | |
1362 | ||
1363 | b) But if we have to wake up, then let's make sure to | |
1364 | dispatch as much as possible on the entire system. | |
1365 | ||
1366 | We implement this by waking up everywhere at the same time | |
850516e0 | 1367 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1368 | perturbation value determined from the boot ID. If we can't, |
850516e0 | 1369 | then we try to find the same spot in every 1s and then 250ms |
c2ba3ad6 LP |
1370 | step. Otherwise, we pick the last possible time to wake up. |
1371 | */ | |
1372 | ||
850516e0 LP |
1373 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1374 | if (c >= b) { | |
1375 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1376 | return b; | |
1377 | ||
1378 | c -= USEC_PER_MINUTE; | |
1379 | } | |
1380 | ||
1381 | if (c >= a) | |
1382 | return c; | |
1383 | ||
1384 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1385 | if (c >= b) { |
1386 | if (_unlikely_(c < USEC_PER_SEC)) | |
1387 | return b; | |
1388 | ||
1389 | c -= USEC_PER_SEC; | |
1390 | } | |
1391 | ||
1392 | if (c >= a) | |
1393 | return c; | |
1394 | ||
1395 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1396 | if (c >= b) { | |
1397 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1398 | return b; | |
1399 | ||
1400 | c -= USEC_PER_MSEC*250; | |
1401 | } | |
1402 | ||
1403 | if (c >= a) | |
1404 | return c; | |
1405 | ||
1406 | return b; | |
1407 | } | |
1408 | ||
fd38203a LP |
1409 | static int event_arm_timer( |
1410 | sd_event *e, | |
1411 | int timer_fd, | |
c2ba3ad6 LP |
1412 | Prioq *earliest, |
1413 | Prioq *latest, | |
fd38203a LP |
1414 | usec_t *next) { |
1415 | ||
1416 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1417 | sd_event_source *a, *b; |
1418 | usec_t t; | |
fd38203a LP |
1419 | int r; |
1420 | ||
1421 | assert_se(e); | |
1422 | assert_se(next); | |
1423 | ||
c2ba3ad6 | 1424 | a = prioq_peek(earliest); |
72aedc1e LP |
1425 | if (!a || a->enabled == SD_EVENT_OFF) { |
1426 | ||
c57b5ca3 LP |
1427 | if (timer_fd < 0) |
1428 | return 0; | |
1429 | ||
72aedc1e LP |
1430 | if (*next == (usec_t) -1) |
1431 | return 0; | |
1432 | ||
1433 | /* disarm */ | |
1434 | r = timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1435 | if (r < 0) | |
1436 | return r; | |
1437 | ||
1438 | *next = (usec_t) -1; | |
1439 | ||
fd38203a | 1440 | return 0; |
72aedc1e | 1441 | } |
fd38203a | 1442 | |
c2ba3ad6 | 1443 | b = prioq_peek(latest); |
baf76283 | 1444 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1445 | |
1446 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
1447 | if (*next == t) | |
fd38203a LP |
1448 | return 0; |
1449 | ||
1450 | assert_se(timer_fd >= 0); | |
1451 | ||
c2ba3ad6 | 1452 | if (t == 0) { |
fd38203a LP |
1453 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1454 | its.it_value.tv_sec = 0; | |
1455 | its.it_value.tv_nsec = 1; | |
1456 | } else | |
c2ba3ad6 | 1457 | timespec_store(&its.it_value, t); |
fd38203a LP |
1458 | |
1459 | r = timerfd_settime(timer_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1460 | if (r < 0) | |
1461 | return r; | |
1462 | ||
c2ba3ad6 | 1463 | *next = t; |
fd38203a LP |
1464 | return 0; |
1465 | } | |
1466 | ||
1467 | static int process_io(sd_event *e, sd_event_source *s, uint32_t events) { | |
1468 | assert(e); | |
1469 | assert(s); | |
1470 | assert(s->type == SOURCE_IO); | |
1471 | ||
1472 | s->io.revents = events; | |
1473 | ||
fd38203a LP |
1474 | return source_set_pending(s, true); |
1475 | } | |
1476 | ||
72aedc1e | 1477 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
1478 | uint64_t x; |
1479 | ssize_t ss; | |
1480 | ||
1481 | assert(e); | |
da7e457c | 1482 | assert(fd >= 0); |
72aedc1e LP |
1483 | assert(next); |
1484 | ||
305f78bf | 1485 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1486 | |
1487 | ss = read(fd, &x, sizeof(x)); | |
1488 | if (ss < 0) { | |
1489 | if (errno == EAGAIN || errno == EINTR) | |
1490 | return 0; | |
1491 | ||
1492 | return -errno; | |
1493 | } | |
1494 | ||
1495 | if (ss != sizeof(x)) | |
1496 | return -EIO; | |
1497 | ||
72aedc1e LP |
1498 | *next = (usec_t) -1; |
1499 | ||
fd38203a LP |
1500 | return 0; |
1501 | } | |
1502 | ||
305f78bf LP |
1503 | static int process_timer( |
1504 | sd_event *e, | |
1505 | usec_t n, | |
1506 | Prioq *earliest, | |
1507 | Prioq *latest) { | |
1508 | ||
fd38203a LP |
1509 | sd_event_source *s; |
1510 | int r; | |
1511 | ||
1512 | assert(e); | |
1513 | ||
1514 | for (;;) { | |
c2ba3ad6 | 1515 | s = prioq_peek(earliest); |
fd38203a LP |
1516 | if (!s || |
1517 | s->time.next > n || | |
baf76283 | 1518 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1519 | s->pending) |
1520 | break; | |
1521 | ||
1522 | r = source_set_pending(s, true); | |
1523 | if (r < 0) | |
1524 | return r; | |
1525 | ||
c2ba3ad6 LP |
1526 | prioq_reshuffle(earliest, s, &s->time.earliest_index); |
1527 | prioq_reshuffle(latest, s, &s->time.latest_index); | |
fd38203a LP |
1528 | } |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | static int process_child(sd_event *e) { | |
1534 | sd_event_source *s; | |
1535 | Iterator i; | |
1536 | int r; | |
1537 | ||
1538 | assert(e); | |
1539 | ||
c2ba3ad6 LP |
1540 | e->need_process_child = false; |
1541 | ||
fd38203a LP |
1542 | /* |
1543 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1544 | + WNOHANG for each PID we wait for, instead of using | |
1545 | P_ALL. This is because we only want to get child | |
1546 | information of very specific child processes, and not all | |
1547 | of them. We might not have processed the SIGCHLD even of a | |
1548 | previous invocation and we don't want to maintain a | |
1549 | unbounded *per-child* event queue, hence we really don't | |
1550 | want anything flushed out of the kernel's queue that we | |
1551 | don't care about. Since this is O(n) this means that if you | |
1552 | have a lot of processes you probably want to handle SIGCHLD | |
1553 | yourself. | |
1554 | */ | |
1555 | ||
1556 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1557 | assert(s->type == SOURCE_CHILD); | |
1558 | ||
1559 | if (s->pending) | |
1560 | continue; | |
1561 | ||
baf76283 | 1562 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1563 | continue; |
1564 | ||
1565 | zero(s->child.siginfo); | |
1566 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|s->child.options); | |
1567 | if (r < 0) | |
1568 | return -errno; | |
1569 | ||
1570 | if (s->child.siginfo.si_pid != 0) { | |
1571 | r = source_set_pending(s, true); | |
1572 | if (r < 0) | |
1573 | return r; | |
1574 | } | |
1575 | } | |
1576 | ||
fd38203a LP |
1577 | return 0; |
1578 | } | |
1579 | ||
1580 | static int process_signal(sd_event *e, uint32_t events) { | |
fd38203a | 1581 | bool read_one = false; |
fd38203a LP |
1582 | int r; |
1583 | ||
da7e457c | 1584 | assert(e); |
0eb2e0e3 ZJS |
1585 | assert(e->signal_sources); |
1586 | ||
305f78bf | 1587 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1588 | |
1589 | for (;;) { | |
0eb2e0e3 ZJS |
1590 | struct signalfd_siginfo si; |
1591 | ssize_t ss; | |
fd38203a LP |
1592 | sd_event_source *s; |
1593 | ||
1594 | ss = read(e->signal_fd, &si, sizeof(si)); | |
1595 | if (ss < 0) { | |
1596 | if (errno == EAGAIN || errno == EINTR) | |
1597 | return read_one; | |
1598 | ||
1599 | return -errno; | |
1600 | } | |
1601 | ||
1602 | if (ss != sizeof(si)) | |
1603 | return -EIO; | |
1604 | ||
1605 | read_one = true; | |
1606 | ||
0eb2e0e3 | 1607 | s = e->signal_sources[si.ssi_signo]; |
fd38203a LP |
1608 | if (si.ssi_signo == SIGCHLD) { |
1609 | r = process_child(e); | |
1610 | if (r < 0) | |
1611 | return r; | |
0eb2e0e3 | 1612 | if (r > 0 || !s) |
fd38203a | 1613 | continue; |
0eb2e0e3 | 1614 | } else |
fd38203a LP |
1615 | if (!s) |
1616 | return -EIO; | |
fd38203a LP |
1617 | |
1618 | s->signal.siginfo = si; | |
1619 | r = source_set_pending(s, true); | |
1620 | if (r < 0) | |
1621 | return r; | |
1622 | } | |
1623 | ||
1624 | ||
1625 | return 0; | |
1626 | } | |
1627 | ||
1628 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 1629 | int r = 0; |
fd38203a LP |
1630 | |
1631 | assert(s); | |
da7e457c | 1632 | assert(s->pending || s->type == SOURCE_QUIT); |
fd38203a | 1633 | |
da7e457c LP |
1634 | if (s->type != SOURCE_DEFER && s->type != SOURCE_QUIT) { |
1635 | r = source_set_pending(s, false); | |
1636 | if (r < 0) | |
1637 | return r; | |
1638 | } | |
fd38203a | 1639 | |
baf76283 LP |
1640 | if (s->enabled == SD_EVENT_ONESHOT) { |
1641 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
1642 | if (r < 0) |
1643 | return r; | |
1644 | } | |
1645 | ||
b7484e2a LP |
1646 | sd_event_source_ref(s); |
1647 | ||
fd38203a LP |
1648 | switch (s->type) { |
1649 | ||
1650 | case SOURCE_IO: | |
1651 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
1652 | break; | |
1653 | ||
1654 | case SOURCE_MONOTONIC: | |
1655 | r = s->time.callback(s, s->time.next, s->userdata); | |
1656 | break; | |
1657 | ||
1658 | case SOURCE_REALTIME: | |
1659 | r = s->time.callback(s, s->time.next, s->userdata); | |
1660 | break; | |
1661 | ||
1662 | case SOURCE_SIGNAL: | |
1663 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
1664 | break; | |
1665 | ||
1666 | case SOURCE_CHILD: | |
1667 | r = s->child.callback(s, &s->child.siginfo, s->userdata); | |
1668 | break; | |
1669 | ||
1670 | case SOURCE_DEFER: | |
1671 | r = s->defer.callback(s, s->userdata); | |
1672 | break; | |
da7e457c LP |
1673 | |
1674 | case SOURCE_QUIT: | |
1675 | r = s->quit.callback(s, s->userdata); | |
1676 | break; | |
fd38203a LP |
1677 | } |
1678 | ||
b7484e2a LP |
1679 | sd_event_source_unref(s); |
1680 | ||
fd38203a LP |
1681 | return r; |
1682 | } | |
1683 | ||
1684 | static int event_prepare(sd_event *e) { | |
1685 | int r; | |
1686 | ||
1687 | assert(e); | |
1688 | ||
1689 | for (;;) { | |
1690 | sd_event_source *s; | |
1691 | ||
1692 | s = prioq_peek(e->prepare); | |
baf76283 | 1693 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1694 | break; |
1695 | ||
1696 | s->prepare_iteration = e->iteration; | |
1697 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
1698 | if (r < 0) | |
1699 | return r; | |
1700 | ||
1701 | assert(s->prepare); | |
1702 | r = s->prepare(s, s->userdata); | |
1703 | if (r < 0) | |
1704 | return r; | |
1705 | ||
1706 | } | |
1707 | ||
1708 | return 0; | |
1709 | } | |
1710 | ||
da7e457c LP |
1711 | static int dispatch_quit(sd_event *e) { |
1712 | sd_event_source *p; | |
1713 | int r; | |
1714 | ||
1715 | assert(e); | |
1716 | ||
1717 | p = prioq_peek(e->quit); | |
baf76283 | 1718 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
1719 | e->state = SD_EVENT_FINISHED; |
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | sd_event_ref(e); | |
1724 | e->iteration++; | |
1725 | e->state = SD_EVENT_QUITTING; | |
1726 | ||
1727 | r = source_dispatch(p); | |
1728 | ||
1729 | e->state = SD_EVENT_PASSIVE; | |
1730 | sd_event_unref(e); | |
1731 | ||
1732 | return r; | |
1733 | } | |
1734 | ||
c2ba3ad6 LP |
1735 | static sd_event_source* event_next_pending(sd_event *e) { |
1736 | sd_event_source *p; | |
1737 | ||
da7e457c LP |
1738 | assert(e); |
1739 | ||
c2ba3ad6 LP |
1740 | p = prioq_peek(e->pending); |
1741 | if (!p) | |
1742 | return NULL; | |
1743 | ||
baf76283 | 1744 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
1745 | return NULL; |
1746 | ||
1747 | return p; | |
1748 | } | |
1749 | ||
f7262a9f | 1750 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
fd38203a LP |
1751 | struct epoll_event ev_queue[EPOLL_QUEUE_MAX]; |
1752 | sd_event_source *p; | |
305f78bf | 1753 | int r, i, m; |
fd38203a | 1754 | |
da7e457c LP |
1755 | assert_return(e, -EINVAL); |
1756 | assert_return(!event_pid_changed(e), -ECHILD); | |
1757 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1758 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
1759 | ||
1760 | if (e->quit_requested) | |
1761 | return dispatch_quit(e); | |
fd38203a | 1762 | |
da7e457c | 1763 | sd_event_ref(e); |
fd38203a | 1764 | e->iteration++; |
da7e457c | 1765 | e->state = SD_EVENT_RUNNING; |
fd38203a LP |
1766 | |
1767 | r = event_prepare(e); | |
1768 | if (r < 0) | |
da7e457c | 1769 | goto finish; |
fd38203a | 1770 | |
1b5995b0 LP |
1771 | r = event_arm_timer(e, e->monotonic_fd, e->monotonic_earliest, e->monotonic_latest, &e->monotonic_next); |
1772 | if (r < 0) | |
1773 | goto finish; | |
fd38203a | 1774 | |
1b5995b0 LP |
1775 | r = event_arm_timer(e, e->realtime_fd, e->realtime_earliest, e->realtime_latest, &e->realtime_next); |
1776 | if (r < 0) | |
1777 | goto finish; | |
fd38203a | 1778 | |
1b5995b0 LP |
1779 | if (event_next_pending(e) || e->need_process_child) |
1780 | timeout = 0; | |
fd38203a | 1781 | |
c2ba3ad6 LP |
1782 | m = epoll_wait(e->epoll_fd, ev_queue, EPOLL_QUEUE_MAX, |
1783 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); | |
da7e457c | 1784 | if (m < 0) { |
d09d5ecd | 1785 | r = errno == EAGAIN || errno == EINTR ? 0 : -errno; |
da7e457c LP |
1786 | goto finish; |
1787 | } | |
fd38203a | 1788 | |
46e8c825 | 1789 | dual_timestamp_get(&e->timestamp); |
fd38203a LP |
1790 | |
1791 | for (i = 0; i < m; i++) { | |
1792 | ||
1793 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_MONOTONIC)) | |
72aedc1e | 1794 | r = flush_timer(e, e->monotonic_fd, ev_queue[i].events, &e->monotonic_next); |
fd38203a | 1795 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_REALTIME)) |
72aedc1e | 1796 | r = flush_timer(e, e->realtime_fd, ev_queue[i].events, &e->realtime_next); |
fd38203a LP |
1797 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) |
1798 | r = process_signal(e, ev_queue[i].events); | |
1799 | else | |
1800 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
1801 | ||
1802 | if (r < 0) | |
da7e457c | 1803 | goto finish; |
fd38203a LP |
1804 | } |
1805 | ||
46e8c825 | 1806 | r = process_timer(e, e->timestamp.monotonic, e->monotonic_earliest, e->monotonic_latest); |
fd38203a | 1807 | if (r < 0) |
da7e457c | 1808 | goto finish; |
fd38203a | 1809 | |
46e8c825 | 1810 | r = process_timer(e, e->timestamp.realtime, e->realtime_earliest, e->realtime_latest); |
fd38203a | 1811 | if (r < 0) |
da7e457c | 1812 | goto finish; |
fd38203a | 1813 | |
c2ba3ad6 | 1814 | if (e->need_process_child) { |
fd38203a LP |
1815 | r = process_child(e); |
1816 | if (r < 0) | |
da7e457c | 1817 | goto finish; |
fd38203a LP |
1818 | } |
1819 | ||
c2ba3ad6 | 1820 | p = event_next_pending(e); |
da7e457c LP |
1821 | if (!p) { |
1822 | r = 0; | |
1823 | goto finish; | |
1824 | } | |
1825 | ||
1826 | r = source_dispatch(p); | |
fd38203a | 1827 | |
da7e457c LP |
1828 | finish: |
1829 | e->state = SD_EVENT_PASSIVE; | |
1830 | sd_event_unref(e); | |
1831 | ||
1832 | return r; | |
fd38203a LP |
1833 | } |
1834 | ||
f7262a9f | 1835 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
1836 | int r; |
1837 | ||
da7e457c LP |
1838 | assert_return(e, -EINVAL); |
1839 | assert_return(!event_pid_changed(e), -ECHILD); | |
1840 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
1841 | ||
1842 | sd_event_ref(e); | |
fd38203a | 1843 | |
da7e457c | 1844 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
1845 | r = sd_event_run(e, (uint64_t) -1); |
1846 | if (r < 0) | |
da7e457c | 1847 | goto finish; |
fd38203a LP |
1848 | } |
1849 | ||
da7e457c LP |
1850 | r = 0; |
1851 | ||
1852 | finish: | |
1853 | sd_event_unref(e); | |
1854 | return r; | |
fd38203a LP |
1855 | } |
1856 | ||
f7262a9f | 1857 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
1858 | assert_return(e, -EINVAL); |
1859 | assert_return(!event_pid_changed(e), -ECHILD); | |
1860 | ||
1861 | return e->state; | |
1862 | } | |
1863 | ||
f7262a9f | 1864 | _public_ int sd_event_get_quit(sd_event *e) { |
da7e457c LP |
1865 | assert_return(e, -EINVAL); |
1866 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 1867 | |
da7e457c | 1868 | return e->quit_requested; |
fd38203a LP |
1869 | } |
1870 | ||
f7262a9f | 1871 | _public_ int sd_event_request_quit(sd_event *e) { |
da7e457c LP |
1872 | assert_return(e, -EINVAL); |
1873 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1874 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 1875 | |
da7e457c | 1876 | e->quit_requested = true; |
fd38203a LP |
1877 | return 0; |
1878 | } | |
46e8c825 | 1879 | |
f7262a9f | 1880 | _public_ int sd_event_get_now_realtime(sd_event *e, uint64_t *usec) { |
46e8c825 LP |
1881 | assert_return(e, -EINVAL); |
1882 | assert_return(usec, -EINVAL); | |
1883 | assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA); | |
1884 | assert_return(!event_pid_changed(e), -ECHILD); | |
1885 | ||
1886 | *usec = e->timestamp.realtime; | |
1887 | return 0; | |
1888 | } | |
1889 | ||
f7262a9f | 1890 | _public_ int sd_event_get_now_monotonic(sd_event *e, uint64_t *usec) { |
46e8c825 LP |
1891 | assert_return(e, -EINVAL); |
1892 | assert_return(usec, -EINVAL); | |
1893 | assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA); | |
1894 | assert_return(!event_pid_changed(e), -ECHILD); | |
1895 | ||
1896 | *usec = e->timestamp.monotonic; | |
1897 | return 0; | |
1898 | } | |
afc6adb5 LP |
1899 | |
1900 | _public_ int sd_event_default(sd_event **ret) { | |
1901 | ||
1902 | static __thread sd_event *default_event = NULL; | |
1903 | sd_event *e; | |
1904 | int r; | |
1905 | ||
1906 | if (!ret) | |
1907 | return !!default_event; | |
1908 | ||
1909 | if (default_event) { | |
1910 | *ret = sd_event_ref(default_event); | |
1911 | return 0; | |
1912 | } | |
1913 | ||
1914 | r = sd_event_new(&e); | |
1915 | if (r < 0) | |
1916 | return r; | |
1917 | ||
1918 | e->default_event_ptr = &default_event; | |
1919 | e->tid = gettid(); | |
1920 | default_event = e; | |
1921 | ||
1922 | *ret = e; | |
1923 | return 1; | |
1924 | } | |
1925 | ||
1926 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
1927 | assert_return(e, -EINVAL); | |
1928 | assert_return(tid, -EINVAL); | |
76b54375 | 1929 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 1930 | |
76b54375 LP |
1931 | if (e->tid != 0) { |
1932 | *tid = e->tid; | |
1933 | return 0; | |
1934 | } | |
1935 | ||
1936 | return -ENXIO; | |
afc6adb5 | 1937 | } |