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fd38203a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/epoll.h> | |
23 | #include <sys/timerfd.h> | |
24 | #include <sys/wait.h> | |
3022d74b | 25 | #include <pthread.h> |
fd38203a | 26 | |
afc6adb5 | 27 | #include "sd-id128.h" |
cde93897 | 28 | #include "sd-daemon.h" |
fd38203a | 29 | #include "macro.h" |
fd38203a LP |
30 | #include "prioq.h" |
31 | #include "hashmap.h" | |
32 | #include "util.h" | |
33 | #include "time-util.h" | |
afc6adb5 | 34 | #include "missing.h" |
6e9feda3 | 35 | #include "set.h" |
a71fe8b8 | 36 | #include "list.h" |
fd38203a LP |
37 | |
38 | #include "sd-event.h" | |
39 | ||
15b38f93 | 40 | #define EPOLL_QUEUE_MAX 512U |
c2ba3ad6 | 41 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
42 | |
43 | typedef enum EventSourceType { | |
44 | SOURCE_IO, | |
6a0f1f6d LP |
45 | SOURCE_TIME_REALTIME, |
46 | SOURCE_TIME_MONOTONIC, | |
47 | SOURCE_TIME_REALTIME_ALARM, | |
48 | SOURCE_TIME_BOOTTIME_ALARM, | |
fd38203a LP |
49 | SOURCE_SIGNAL, |
50 | SOURCE_CHILD, | |
da7e457c | 51 | SOURCE_DEFER, |
6e9feda3 | 52 | SOURCE_POST, |
6203e07a | 53 | SOURCE_EXIT, |
6a0f1f6d | 54 | SOURCE_WATCHDOG, |
a71fe8b8 | 55 | _SOURCE_EVENT_SOURCE_TYPE_MAX, |
6a0f1f6d | 56 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 |
fd38203a LP |
57 | } EventSourceType; |
58 | ||
6a0f1f6d LP |
59 | #define EVENT_SOURCE_IS_TIME(t) IN_SET((t), SOURCE_TIME_REALTIME, SOURCE_TIME_MONOTONIC, SOURCE_TIME_REALTIME_ALARM, SOURCE_TIME_BOOTTIME_ALARM) |
60 | ||
fd38203a | 61 | struct sd_event_source { |
da7e457c | 62 | unsigned n_ref; |
fd38203a LP |
63 | |
64 | sd_event *event; | |
65 | void *userdata; | |
718db961 | 66 | sd_event_handler_t prepare; |
fd38203a | 67 | |
6a0f1f6d | 68 | EventSourceType type:5; |
baf76283 | 69 | int enabled:3; |
fd38203a | 70 | bool pending:1; |
12179984 | 71 | bool dispatching:1; |
a71fe8b8 | 72 | bool floating:1; |
fd38203a | 73 | |
31927c16 | 74 | int64_t priority; |
fd38203a LP |
75 | unsigned pending_index; |
76 | unsigned prepare_index; | |
77 | unsigned pending_iteration; | |
78 | unsigned prepare_iteration; | |
79 | ||
a71fe8b8 LP |
80 | LIST_FIELDS(sd_event_source, sources); |
81 | ||
fd38203a LP |
82 | union { |
83 | struct { | |
718db961 | 84 | sd_event_io_handler_t callback; |
fd38203a LP |
85 | int fd; |
86 | uint32_t events; | |
87 | uint32_t revents; | |
88 | bool registered:1; | |
89 | } io; | |
90 | struct { | |
718db961 | 91 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
92 | usec_t next, accuracy; |
93 | unsigned earliest_index; | |
94 | unsigned latest_index; | |
fd38203a LP |
95 | } time; |
96 | struct { | |
718db961 | 97 | sd_event_signal_handler_t callback; |
fd38203a LP |
98 | struct signalfd_siginfo siginfo; |
99 | int sig; | |
100 | } signal; | |
101 | struct { | |
718db961 | 102 | sd_event_child_handler_t callback; |
fd38203a LP |
103 | siginfo_t siginfo; |
104 | pid_t pid; | |
105 | int options; | |
106 | } child; | |
107 | struct { | |
718db961 | 108 | sd_event_handler_t callback; |
fd38203a | 109 | } defer; |
6e9feda3 LP |
110 | struct { |
111 | sd_event_handler_t callback; | |
112 | } post; | |
da7e457c | 113 | struct { |
718db961 | 114 | sd_event_handler_t callback; |
da7e457c | 115 | unsigned prioq_index; |
6203e07a | 116 | } exit; |
fd38203a LP |
117 | }; |
118 | }; | |
119 | ||
6a0f1f6d LP |
120 | struct clock_data { |
121 | int fd; | |
122 | ||
123 | /* For all clocks we maintain two priority queues each, one | |
124 | * ordered for the earliest times the events may be | |
125 | * dispatched, and one ordered by the latest times they must | |
126 | * have been dispatched. The range between the top entries in | |
127 | * the two prioqs is the time window we can freely schedule | |
128 | * wakeups in */ | |
129 | ||
130 | Prioq *earliest; | |
131 | Prioq *latest; | |
132 | usec_t next; | |
133 | }; | |
134 | ||
fd38203a | 135 | struct sd_event { |
da7e457c | 136 | unsigned n_ref; |
fd38203a LP |
137 | |
138 | int epoll_fd; | |
139 | int signal_fd; | |
cde93897 | 140 | int watchdog_fd; |
fd38203a LP |
141 | |
142 | Prioq *pending; | |
143 | Prioq *prepare; | |
c2ba3ad6 | 144 | |
6a0f1f6d LP |
145 | /* timerfd_create() only supports these four clocks so far. We |
146 | * can add support for more clocks when the kernel learns to | |
147 | * deal with them, too. */ | |
148 | struct clock_data realtime; | |
149 | struct clock_data monotonic; | |
150 | struct clock_data realtime_alarm; | |
151 | struct clock_data boottime_alarm; | |
fd38203a | 152 | |
da7e457c LP |
153 | usec_t perturb; |
154 | ||
fd38203a LP |
155 | sigset_t sigset; |
156 | sd_event_source **signal_sources; | |
157 | ||
158 | Hashmap *child_sources; | |
baf76283 | 159 | unsigned n_enabled_child_sources; |
fd38203a | 160 | |
6e9feda3 LP |
161 | Set *post_sources; |
162 | ||
6203e07a | 163 | Prioq *exit; |
fd38203a | 164 | |
da7e457c | 165 | pid_t original_pid; |
c2ba3ad6 | 166 | |
da7e457c | 167 | unsigned iteration; |
46e8c825 | 168 | dual_timestamp timestamp; |
6a0f1f6d | 169 | usec_t timestamp_boottime; |
da7e457c | 170 | int state; |
eaa3cbef | 171 | |
6203e07a | 172 | bool exit_requested:1; |
da7e457c | 173 | bool need_process_child:1; |
cde93897 | 174 | bool watchdog:1; |
afc6adb5 | 175 | |
6203e07a LP |
176 | int exit_code; |
177 | ||
afc6adb5 LP |
178 | pid_t tid; |
179 | sd_event **default_event_ptr; | |
cde93897 LP |
180 | |
181 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
182 | |
183 | unsigned n_sources; | |
a71fe8b8 LP |
184 | |
185 | LIST_HEAD(sd_event_source, sources); | |
fd38203a LP |
186 | }; |
187 | ||
a71fe8b8 LP |
188 | static void source_disconnect(sd_event_source *s); |
189 | ||
fd38203a LP |
190 | static int pending_prioq_compare(const void *a, const void *b) { |
191 | const sd_event_source *x = a, *y = b; | |
192 | ||
193 | assert(x->pending); | |
194 | assert(y->pending); | |
195 | ||
baf76283 LP |
196 | /* Enabled ones first */ |
197 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 198 | return -1; |
baf76283 | 199 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
200 | return 1; |
201 | ||
202 | /* Lower priority values first */ | |
203 | if (x->priority < y->priority) | |
204 | return -1; | |
205 | if (x->priority > y->priority) | |
206 | return 1; | |
207 | ||
208 | /* Older entries first */ | |
209 | if (x->pending_iteration < y->pending_iteration) | |
210 | return -1; | |
211 | if (x->pending_iteration > y->pending_iteration) | |
212 | return 1; | |
213 | ||
214 | /* Stability for the rest */ | |
215 | if (x < y) | |
216 | return -1; | |
dfcd88f6 | 217 | if (x > y) |
fd38203a LP |
218 | return 1; |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | static int prepare_prioq_compare(const void *a, const void *b) { | |
224 | const sd_event_source *x = a, *y = b; | |
225 | ||
226 | assert(x->prepare); | |
227 | assert(y->prepare); | |
228 | ||
229 | /* Move most recently prepared ones last, so that we can stop | |
230 | * preparing as soon as we hit one that has already been | |
231 | * prepared in the current iteration */ | |
232 | if (x->prepare_iteration < y->prepare_iteration) | |
233 | return -1; | |
234 | if (x->prepare_iteration > y->prepare_iteration) | |
235 | return 1; | |
236 | ||
baf76283 LP |
237 | /* Enabled ones first */ |
238 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 239 | return -1; |
baf76283 | 240 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
241 | return 1; |
242 | ||
243 | /* Lower priority values first */ | |
244 | if (x->priority < y->priority) | |
245 | return -1; | |
246 | if (x->priority > y->priority) | |
247 | return 1; | |
248 | ||
249 | /* Stability for the rest */ | |
250 | if (x < y) | |
251 | return -1; | |
dfcd88f6 | 252 | if (x > y) |
fd38203a LP |
253 | return 1; |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
c2ba3ad6 | 258 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
259 | const sd_event_source *x = a, *y = b; |
260 | ||
6a0f1f6d LP |
261 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
262 | assert(x->type == y->type); | |
fd38203a | 263 | |
baf76283 LP |
264 | /* Enabled ones first */ |
265 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 266 | return -1; |
baf76283 | 267 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
268 | return 1; |
269 | ||
270 | /* Move the pending ones to the end */ | |
271 | if (!x->pending && y->pending) | |
272 | return -1; | |
273 | if (x->pending && !y->pending) | |
274 | return 1; | |
275 | ||
276 | /* Order by time */ | |
277 | if (x->time.next < y->time.next) | |
278 | return -1; | |
279 | if (x->time.next > y->time.next) | |
a99badf5 | 280 | return 1; |
fd38203a LP |
281 | |
282 | /* Stability for the rest */ | |
283 | if (x < y) | |
284 | return -1; | |
dfcd88f6 | 285 | if (x > y) |
fd38203a LP |
286 | return 1; |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
c2ba3ad6 LP |
291 | static int latest_time_prioq_compare(const void *a, const void *b) { |
292 | const sd_event_source *x = a, *y = b; | |
293 | ||
6a0f1f6d LP |
294 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
295 | assert(x->type == y->type); | |
c2ba3ad6 | 296 | |
baf76283 LP |
297 | /* Enabled ones first */ |
298 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 299 | return -1; |
baf76283 | 300 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
301 | return 1; |
302 | ||
303 | /* Move the pending ones to the end */ | |
304 | if (!x->pending && y->pending) | |
305 | return -1; | |
306 | if (x->pending && !y->pending) | |
307 | return 1; | |
308 | ||
309 | /* Order by time */ | |
310 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
311 | return -1; | |
312 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
a99badf5 | 313 | return 1; |
c2ba3ad6 LP |
314 | |
315 | /* Stability for the rest */ | |
316 | if (x < y) | |
317 | return -1; | |
318 | if (x > y) | |
319 | return 1; | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
6203e07a | 324 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
325 | const sd_event_source *x = a, *y = b; |
326 | ||
6203e07a LP |
327 | assert(x->type == SOURCE_EXIT); |
328 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 329 | |
baf76283 LP |
330 | /* Enabled ones first */ |
331 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 332 | return -1; |
baf76283 | 333 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
334 | return 1; |
335 | ||
336 | /* Lower priority values first */ | |
337 | if (x->priority < y->priority) | |
338 | return -1; | |
339 | if (x->priority > y->priority) | |
340 | return 1; | |
341 | ||
342 | /* Stability for the rest */ | |
343 | if (x < y) | |
344 | return -1; | |
345 | if (x > y) | |
346 | return 1; | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
6a0f1f6d LP |
351 | static void free_clock_data(struct clock_data *d) { |
352 | assert(d); | |
353 | ||
354 | safe_close(d->fd); | |
355 | prioq_free(d->earliest); | |
356 | prioq_free(d->latest); | |
357 | } | |
358 | ||
fd38203a | 359 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
360 | sd_event_source *s; |
361 | ||
fd38203a | 362 | assert(e); |
a71fe8b8 LP |
363 | |
364 | while ((s = e->sources)) { | |
365 | assert(s->floating); | |
366 | source_disconnect(s); | |
367 | sd_event_source_unref(s); | |
368 | } | |
369 | ||
15b38f93 | 370 | assert(e->n_sources == 0); |
fd38203a | 371 | |
afc6adb5 LP |
372 | if (e->default_event_ptr) |
373 | *(e->default_event_ptr) = NULL; | |
374 | ||
03e334a1 LP |
375 | safe_close(e->epoll_fd); |
376 | safe_close(e->signal_fd); | |
03e334a1 | 377 | safe_close(e->watchdog_fd); |
cde93897 | 378 | |
6a0f1f6d LP |
379 | free_clock_data(&e->realtime); |
380 | free_clock_data(&e->monotonic); | |
381 | free_clock_data(&e->realtime_alarm); | |
382 | free_clock_data(&e->boottime_alarm); | |
383 | ||
fd38203a LP |
384 | prioq_free(e->pending); |
385 | prioq_free(e->prepare); | |
6203e07a | 386 | prioq_free(e->exit); |
fd38203a LP |
387 | |
388 | free(e->signal_sources); | |
389 | ||
390 | hashmap_free(e->child_sources); | |
6e9feda3 | 391 | set_free(e->post_sources); |
fd38203a LP |
392 | free(e); |
393 | } | |
394 | ||
f7262a9f | 395 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
396 | sd_event *e; |
397 | int r; | |
398 | ||
305f78bf | 399 | assert_return(ret, -EINVAL); |
fd38203a LP |
400 | |
401 | e = new0(sd_event, 1); | |
402 | if (!e) | |
403 | return -ENOMEM; | |
404 | ||
da7e457c | 405 | e->n_ref = 1; |
6a0f1f6d LP |
406 | e->signal_fd = e->watchdog_fd = e->epoll_fd = e->realtime.fd = e->monotonic.fd = e->realtime_alarm.fd = e->boottime_alarm.fd = -1; |
407 | e->realtime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = (usec_t) -1; | |
eaa3cbef | 408 | e->original_pid = getpid(); |
6a0f1f6d | 409 | e->perturb = (usec_t) -1; |
fd38203a LP |
410 | |
411 | assert_se(sigemptyset(&e->sigset) == 0); | |
412 | ||
413 | e->pending = prioq_new(pending_prioq_compare); | |
414 | if (!e->pending) { | |
415 | r = -ENOMEM; | |
416 | goto fail; | |
417 | } | |
418 | ||
419 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
420 | if (e->epoll_fd < 0) { | |
421 | r = -errno; | |
422 | goto fail; | |
423 | } | |
424 | ||
425 | *ret = e; | |
426 | return 0; | |
427 | ||
428 | fail: | |
429 | event_free(e); | |
430 | return r; | |
431 | } | |
432 | ||
f7262a9f | 433 | _public_ sd_event* sd_event_ref(sd_event *e) { |
305f78bf | 434 | assert_return(e, NULL); |
fd38203a | 435 | |
da7e457c LP |
436 | assert(e->n_ref >= 1); |
437 | e->n_ref++; | |
fd38203a LP |
438 | |
439 | return e; | |
440 | } | |
441 | ||
f7262a9f | 442 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
443 | |
444 | if (!e) | |
445 | return NULL; | |
fd38203a | 446 | |
da7e457c LP |
447 | assert(e->n_ref >= 1); |
448 | e->n_ref--; | |
449 | ||
450 | if (e->n_ref <= 0) | |
fd38203a LP |
451 | event_free(e); |
452 | ||
453 | return NULL; | |
454 | } | |
455 | ||
eaa3cbef LP |
456 | static bool event_pid_changed(sd_event *e) { |
457 | assert(e); | |
458 | ||
459 | /* We don't support people creating am event loop and keeping | |
460 | * it around over a fork(). Let's complain. */ | |
461 | ||
462 | return e->original_pid != getpid(); | |
463 | } | |
464 | ||
fd38203a LP |
465 | static int source_io_unregister(sd_event_source *s) { |
466 | int r; | |
467 | ||
468 | assert(s); | |
469 | assert(s->type == SOURCE_IO); | |
470 | ||
471 | if (!s->io.registered) | |
472 | return 0; | |
473 | ||
474 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
475 | if (r < 0) | |
476 | return -errno; | |
477 | ||
478 | s->io.registered = false; | |
479 | return 0; | |
480 | } | |
481 | ||
305f78bf LP |
482 | static int source_io_register( |
483 | sd_event_source *s, | |
484 | int enabled, | |
485 | uint32_t events) { | |
486 | ||
fd38203a LP |
487 | struct epoll_event ev = {}; |
488 | int r; | |
489 | ||
490 | assert(s); | |
491 | assert(s->type == SOURCE_IO); | |
baf76283 | 492 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
493 | |
494 | ev.events = events; | |
495 | ev.data.ptr = s; | |
496 | ||
baf76283 | 497 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
498 | ev.events |= EPOLLONESHOT; |
499 | ||
500 | if (s->io.registered) | |
501 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
502 | else | |
503 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
504 | ||
505 | if (r < 0) | |
506 | return -errno; | |
507 | ||
508 | s->io.registered = true; | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
6a0f1f6d LP |
513 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
514 | ||
515 | switch (t) { | |
516 | ||
517 | case SOURCE_TIME_REALTIME: | |
518 | return CLOCK_REALTIME; | |
519 | ||
520 | case SOURCE_TIME_MONOTONIC: | |
521 | return CLOCK_MONOTONIC; | |
522 | ||
523 | case SOURCE_TIME_REALTIME_ALARM: | |
524 | return CLOCK_REALTIME_ALARM; | |
525 | ||
526 | case SOURCE_TIME_BOOTTIME_ALARM: | |
527 | return CLOCK_BOOTTIME_ALARM; | |
528 | ||
529 | default: | |
530 | return (clockid_t) -1; | |
531 | } | |
532 | } | |
533 | ||
534 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
535 | ||
536 | switch (clock) { | |
537 | ||
538 | case CLOCK_REALTIME: | |
539 | return SOURCE_TIME_REALTIME; | |
540 | ||
541 | case CLOCK_MONOTONIC: | |
542 | return SOURCE_TIME_MONOTONIC; | |
543 | ||
544 | case CLOCK_REALTIME_ALARM: | |
545 | return SOURCE_TIME_REALTIME_ALARM; | |
546 | ||
547 | case CLOCK_BOOTTIME_ALARM: | |
548 | return SOURCE_TIME_BOOTTIME_ALARM; | |
549 | ||
550 | default: | |
551 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
552 | } | |
553 | } | |
554 | ||
555 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
556 | assert(e); | |
557 | ||
558 | switch (t) { | |
559 | ||
560 | case SOURCE_TIME_REALTIME: | |
561 | return &e->realtime; | |
562 | ||
563 | case SOURCE_TIME_MONOTONIC: | |
564 | return &e->monotonic; | |
565 | ||
566 | case SOURCE_TIME_REALTIME_ALARM: | |
567 | return &e->realtime_alarm; | |
568 | ||
569 | case SOURCE_TIME_BOOTTIME_ALARM: | |
570 | return &e->boottime_alarm; | |
571 | ||
572 | default: | |
573 | return NULL; | |
574 | } | |
575 | } | |
576 | ||
a71fe8b8 LP |
577 | static void source_disconnect(sd_event_source *s) { |
578 | sd_event *event; | |
579 | ||
fd38203a LP |
580 | assert(s); |
581 | ||
a71fe8b8 LP |
582 | if (!s->event) |
583 | return; | |
15b38f93 | 584 | |
a71fe8b8 | 585 | assert(s->event->n_sources > 0); |
fd38203a | 586 | |
a71fe8b8 | 587 | switch (s->type) { |
fd38203a | 588 | |
a71fe8b8 LP |
589 | case SOURCE_IO: |
590 | if (s->io.fd >= 0) | |
591 | source_io_unregister(s); | |
fd38203a | 592 | |
a71fe8b8 | 593 | break; |
6a0f1f6d | 594 | |
a71fe8b8 LP |
595 | case SOURCE_TIME_REALTIME: |
596 | case SOURCE_TIME_MONOTONIC: | |
597 | case SOURCE_TIME_REALTIME_ALARM: | |
598 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
599 | struct clock_data *d; | |
fd38203a | 600 | |
a71fe8b8 LP |
601 | d = event_get_clock_data(s->event, s->type); |
602 | assert(d); | |
603 | ||
604 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
605 | prioq_remove(d->latest, s, &s->time.latest_index); | |
606 | break; | |
607 | } | |
608 | ||
609 | case SOURCE_SIGNAL: | |
610 | if (s->signal.sig > 0) { | |
611 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) | |
612 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); | |
613 | ||
614 | if (s->event->signal_sources) | |
615 | s->event->signal_sources[s->signal.sig] = NULL; | |
6a0f1f6d | 616 | } |
fd38203a | 617 | |
a71fe8b8 | 618 | break; |
fd38203a | 619 | |
a71fe8b8 LP |
620 | case SOURCE_CHILD: |
621 | if (s->child.pid > 0) { | |
622 | if (s->enabled != SD_EVENT_OFF) { | |
623 | assert(s->event->n_enabled_child_sources > 0); | |
624 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
625 | } |
626 | ||
a71fe8b8 LP |
627 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) |
628 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
fd38203a | 629 | |
a71fe8b8 LP |
630 | hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid)); |
631 | } | |
fd38203a | 632 | |
a71fe8b8 | 633 | break; |
fd38203a | 634 | |
a71fe8b8 LP |
635 | case SOURCE_DEFER: |
636 | /* nothing */ | |
637 | break; | |
fd38203a | 638 | |
a71fe8b8 LP |
639 | case SOURCE_POST: |
640 | set_remove(s->event->post_sources, s); | |
641 | break; | |
da7e457c | 642 | |
a71fe8b8 LP |
643 | case SOURCE_EXIT: |
644 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
645 | break; | |
0eb2e0e3 | 646 | |
a71fe8b8 LP |
647 | default: |
648 | assert_not_reached("Wut? I shouldn't exist."); | |
649 | } | |
6e9feda3 | 650 | |
a71fe8b8 LP |
651 | if (s->pending) |
652 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 653 | |
a71fe8b8 LP |
654 | if (s->prepare) |
655 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 656 | |
a71fe8b8 | 657 | event = s->event; |
fd38203a | 658 | |
a71fe8b8 LP |
659 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
660 | s->event = NULL; | |
661 | LIST_REMOVE(sources, event->sources, s); | |
662 | event->n_sources--; | |
fd38203a | 663 | |
a71fe8b8 LP |
664 | if (!s->floating) |
665 | sd_event_unref(event); | |
666 | } | |
667 | ||
668 | static void source_free(sd_event_source *s) { | |
669 | assert(s); | |
fd38203a | 670 | |
a71fe8b8 | 671 | source_disconnect(s); |
fd38203a LP |
672 | free(s); |
673 | } | |
674 | ||
675 | static int source_set_pending(sd_event_source *s, bool b) { | |
676 | int r; | |
677 | ||
678 | assert(s); | |
6203e07a | 679 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
680 | |
681 | if (s->pending == b) | |
682 | return 0; | |
683 | ||
684 | s->pending = b; | |
685 | ||
686 | if (b) { | |
687 | s->pending_iteration = s->event->iteration; | |
688 | ||
689 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
690 | if (r < 0) { | |
691 | s->pending = false; | |
692 | return r; | |
693 | } | |
694 | } else | |
695 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
696 | ||
6a0f1f6d LP |
697 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
698 | struct clock_data *d; | |
699 | ||
700 | d = event_get_clock_data(s->event, s->type); | |
701 | assert(d); | |
702 | ||
703 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
704 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
2576a19e LP |
705 | } |
706 | ||
fd38203a LP |
707 | return 0; |
708 | } | |
709 | ||
a71fe8b8 | 710 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
711 | sd_event_source *s; |
712 | ||
713 | assert(e); | |
714 | ||
715 | s = new0(sd_event_source, 1); | |
716 | if (!s) | |
717 | return NULL; | |
718 | ||
da7e457c | 719 | s->n_ref = 1; |
a71fe8b8 | 720 | s->event = e; |
4a134c49 | 721 | s->floating = floating; |
fd38203a | 722 | s->type = type; |
fd38203a | 723 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
724 | |
725 | if (!floating) | |
726 | sd_event_ref(e); | |
fd38203a | 727 | |
a71fe8b8 | 728 | LIST_PREPEND(sources, e->sources, s); |
15b38f93 LP |
729 | e->n_sources ++; |
730 | ||
fd38203a LP |
731 | return s; |
732 | } | |
733 | ||
f7262a9f | 734 | _public_ int sd_event_add_io( |
fd38203a | 735 | sd_event *e, |
151b9b96 | 736 | sd_event_source **ret, |
fd38203a LP |
737 | int fd, |
738 | uint32_t events, | |
718db961 | 739 | sd_event_io_handler_t callback, |
151b9b96 | 740 | void *userdata) { |
fd38203a LP |
741 | |
742 | sd_event_source *s; | |
743 | int r; | |
744 | ||
305f78bf LP |
745 | assert_return(e, -EINVAL); |
746 | assert_return(fd >= 0, -EINVAL); | |
2a16a986 | 747 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 748 | assert_return(callback, -EINVAL); |
da7e457c | 749 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 750 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 751 | |
a71fe8b8 | 752 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
753 | if (!s) |
754 | return -ENOMEM; | |
755 | ||
756 | s->io.fd = fd; | |
757 | s->io.events = events; | |
758 | s->io.callback = callback; | |
759 | s->userdata = userdata; | |
baf76283 | 760 | s->enabled = SD_EVENT_ON; |
fd38203a | 761 | |
baf76283 | 762 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
763 | if (r < 0) { |
764 | source_free(s); | |
765 | return -errno; | |
766 | } | |
767 | ||
a71fe8b8 LP |
768 | if (ret) |
769 | *ret = s; | |
770 | ||
fd38203a LP |
771 | return 0; |
772 | } | |
773 | ||
52444dc4 LP |
774 | static void initialize_perturb(sd_event *e) { |
775 | sd_id128_t bootid = {}; | |
776 | ||
777 | /* When we sleep for longer, we try to realign the wakeup to | |
778 | the same time wihtin each minute/second/250ms, so that | |
779 | events all across the system can be coalesced into a single | |
780 | CPU wakeup. However, let's take some system-specific | |
781 | randomness for this value, so that in a network of systems | |
782 | with synced clocks timer events are distributed a | |
783 | bit. Here, we calculate a perturbation usec offset from the | |
784 | boot ID. */ | |
785 | ||
786 | if (_likely_(e->perturb != (usec_t) -1)) | |
787 | return; | |
788 | ||
789 | if (sd_id128_get_boot(&bootid) >= 0) | |
790 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
791 | } | |
792 | ||
fd38203a LP |
793 | static int event_setup_timer_fd( |
794 | sd_event *e, | |
6a0f1f6d LP |
795 | struct clock_data *d, |
796 | clockid_t clock) { | |
fd38203a LP |
797 | |
798 | struct epoll_event ev = {}; | |
799 | int r, fd; | |
800 | ||
801 | assert(e); | |
6a0f1f6d | 802 | assert(d); |
fd38203a | 803 | |
6a0f1f6d | 804 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
805 | return 0; |
806 | ||
6a0f1f6d | 807 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
808 | if (fd < 0) |
809 | return -errno; | |
810 | ||
811 | ev.events = EPOLLIN; | |
6a0f1f6d | 812 | ev.data.ptr = INT_TO_PTR(clock_to_event_source_type(clock)); |
fd38203a LP |
813 | |
814 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
815 | if (r < 0) { | |
03e334a1 | 816 | safe_close(fd); |
fd38203a LP |
817 | return -errno; |
818 | } | |
819 | ||
6a0f1f6d | 820 | d->fd = fd; |
fd38203a LP |
821 | return 0; |
822 | } | |
823 | ||
6a0f1f6d | 824 | _public_ int sd_event_add_time( |
fd38203a | 825 | sd_event *e, |
151b9b96 | 826 | sd_event_source **ret, |
6a0f1f6d | 827 | clockid_t clock, |
fd38203a | 828 | uint64_t usec, |
c2ba3ad6 | 829 | uint64_t accuracy, |
718db961 | 830 | sd_event_time_handler_t callback, |
151b9b96 | 831 | void *userdata) { |
fd38203a | 832 | |
6a0f1f6d | 833 | EventSourceType type; |
fd38203a | 834 | sd_event_source *s; |
6a0f1f6d | 835 | struct clock_data *d; |
fd38203a LP |
836 | int r; |
837 | ||
305f78bf | 838 | assert_return(e, -EINVAL); |
305f78bf LP |
839 | assert_return(usec != (uint64_t) -1, -EINVAL); |
840 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 841 | assert_return(callback, -EINVAL); |
da7e457c | 842 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 843 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 844 | |
6a0f1f6d LP |
845 | type = clock_to_event_source_type(clock); |
846 | assert_return(type >= 0, -ENOTSUP); | |
847 | ||
848 | d = event_get_clock_data(e, type); | |
849 | assert(d); | |
c2ba3ad6 | 850 | |
6a0f1f6d LP |
851 | if (!d->earliest) { |
852 | d->earliest = prioq_new(earliest_time_prioq_compare); | |
853 | if (!d->earliest) | |
c2ba3ad6 LP |
854 | return -ENOMEM; |
855 | } | |
fd38203a | 856 | |
6a0f1f6d LP |
857 | if (!d->latest) { |
858 | d->latest = prioq_new(latest_time_prioq_compare); | |
859 | if (!d->latest) | |
fd38203a LP |
860 | return -ENOMEM; |
861 | } | |
862 | ||
6a0f1f6d LP |
863 | if (d->fd < 0) { |
864 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
865 | if (r < 0) |
866 | return r; | |
867 | } | |
868 | ||
a71fe8b8 | 869 | s = source_new(e, !ret, type); |
fd38203a LP |
870 | if (!s) |
871 | return -ENOMEM; | |
872 | ||
873 | s->time.next = usec; | |
c2ba3ad6 | 874 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 875 | s->time.callback = callback; |
da7e457c | 876 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 877 | s->userdata = userdata; |
baf76283 | 878 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 879 | |
6a0f1f6d | 880 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
881 | if (r < 0) |
882 | goto fail; | |
883 | ||
6a0f1f6d | 884 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
885 | if (r < 0) |
886 | goto fail; | |
fd38203a | 887 | |
a71fe8b8 LP |
888 | if (ret) |
889 | *ret = s; | |
890 | ||
fd38203a | 891 | return 0; |
c2ba3ad6 LP |
892 | |
893 | fail: | |
894 | source_free(s); | |
895 | return r; | |
fd38203a LP |
896 | } |
897 | ||
fd38203a LP |
898 | static int event_update_signal_fd(sd_event *e) { |
899 | struct epoll_event ev = {}; | |
900 | bool add_to_epoll; | |
901 | int r; | |
902 | ||
903 | assert(e); | |
904 | ||
905 | add_to_epoll = e->signal_fd < 0; | |
906 | ||
907 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
908 | if (r < 0) | |
909 | return -errno; | |
910 | ||
911 | e->signal_fd = r; | |
912 | ||
913 | if (!add_to_epoll) | |
914 | return 0; | |
915 | ||
916 | ev.events = EPOLLIN; | |
917 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
918 | ||
919 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
920 | if (r < 0) { | |
03e334a1 | 921 | e->signal_fd = safe_close(e->signal_fd); |
fd38203a LP |
922 | return -errno; |
923 | } | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
59bc1fd7 LP |
928 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
929 | assert(s); | |
930 | ||
931 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
932 | } | |
933 | ||
f7262a9f | 934 | _public_ int sd_event_add_signal( |
305f78bf | 935 | sd_event *e, |
151b9b96 | 936 | sd_event_source **ret, |
305f78bf | 937 | int sig, |
718db961 | 938 | sd_event_signal_handler_t callback, |
151b9b96 | 939 | void *userdata) { |
305f78bf | 940 | |
fd38203a | 941 | sd_event_source *s; |
3022d74b | 942 | sigset_t ss; |
fd38203a LP |
943 | int r; |
944 | ||
305f78bf LP |
945 | assert_return(e, -EINVAL); |
946 | assert_return(sig > 0, -EINVAL); | |
947 | assert_return(sig < _NSIG, -EINVAL); | |
da7e457c | 948 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 949 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 950 | |
59bc1fd7 LP |
951 | if (!callback) |
952 | callback = signal_exit_callback; | |
953 | ||
3022d74b LP |
954 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
955 | if (r < 0) | |
956 | return -errno; | |
957 | ||
958 | if (!sigismember(&ss, sig)) | |
959 | return -EBUSY; | |
960 | ||
fd38203a LP |
961 | if (!e->signal_sources) { |
962 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
963 | if (!e->signal_sources) | |
964 | return -ENOMEM; | |
965 | } else if (e->signal_sources[sig]) | |
966 | return -EBUSY; | |
967 | ||
a71fe8b8 | 968 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
969 | if (!s) |
970 | return -ENOMEM; | |
971 | ||
972 | s->signal.sig = sig; | |
973 | s->signal.callback = callback; | |
974 | s->userdata = userdata; | |
baf76283 | 975 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
976 | |
977 | e->signal_sources[sig] = s; | |
978 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
979 | ||
baf76283 | 980 | if (sig != SIGCHLD || e->n_enabled_child_sources == 0) { |
fd38203a LP |
981 | r = event_update_signal_fd(e); |
982 | if (r < 0) { | |
983 | source_free(s); | |
984 | return r; | |
985 | } | |
986 | } | |
987 | ||
a71fe8b8 LP |
988 | if (ret) |
989 | *ret = s; | |
990 | ||
fd38203a LP |
991 | return 0; |
992 | } | |
993 | ||
f7262a9f | 994 | _public_ int sd_event_add_child( |
305f78bf | 995 | sd_event *e, |
151b9b96 | 996 | sd_event_source **ret, |
305f78bf LP |
997 | pid_t pid, |
998 | int options, | |
718db961 | 999 | sd_event_child_handler_t callback, |
151b9b96 | 1000 | void *userdata) { |
305f78bf | 1001 | |
fd38203a LP |
1002 | sd_event_source *s; |
1003 | int r; | |
1004 | ||
305f78bf LP |
1005 | assert_return(e, -EINVAL); |
1006 | assert_return(pid > 1, -EINVAL); | |
1007 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1008 | assert_return(options != 0, -EINVAL); | |
1009 | assert_return(callback, -EINVAL); | |
da7e457c | 1010 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1011 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
1012 | |
1013 | r = hashmap_ensure_allocated(&e->child_sources, trivial_hash_func, trivial_compare_func); | |
1014 | if (r < 0) | |
1015 | return r; | |
1016 | ||
1017 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
1018 | return -EBUSY; | |
1019 | ||
a71fe8b8 | 1020 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1021 | if (!s) |
1022 | return -ENOMEM; | |
1023 | ||
1024 | s->child.pid = pid; | |
1025 | s->child.options = options; | |
1026 | s->child.callback = callback; | |
1027 | s->userdata = userdata; | |
baf76283 | 1028 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1029 | |
1030 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
1031 | if (r < 0) { | |
1032 | source_free(s); | |
1033 | return r; | |
1034 | } | |
1035 | ||
baf76283 | 1036 | e->n_enabled_child_sources ++; |
fd38203a LP |
1037 | |
1038 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
1039 | ||
1040 | if (!e->signal_sources || !e->signal_sources[SIGCHLD]) { | |
1041 | r = event_update_signal_fd(e); | |
1042 | if (r < 0) { | |
1043 | source_free(s); | |
1044 | return -errno; | |
1045 | } | |
1046 | } | |
1047 | ||
c2ba3ad6 LP |
1048 | e->need_process_child = true; |
1049 | ||
a71fe8b8 LP |
1050 | if (ret) |
1051 | *ret = s; | |
1052 | ||
fd38203a LP |
1053 | return 0; |
1054 | } | |
1055 | ||
f7262a9f | 1056 | _public_ int sd_event_add_defer( |
305f78bf | 1057 | sd_event *e, |
151b9b96 | 1058 | sd_event_source **ret, |
718db961 | 1059 | sd_event_handler_t callback, |
151b9b96 | 1060 | void *userdata) { |
305f78bf | 1061 | |
fd38203a LP |
1062 | sd_event_source *s; |
1063 | int r; | |
1064 | ||
305f78bf LP |
1065 | assert_return(e, -EINVAL); |
1066 | assert_return(callback, -EINVAL); | |
da7e457c | 1067 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1068 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1069 | |
a71fe8b8 | 1070 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1071 | if (!s) |
1072 | return -ENOMEM; | |
1073 | ||
1074 | s->defer.callback = callback; | |
1075 | s->userdata = userdata; | |
baf76283 | 1076 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1077 | |
1078 | r = source_set_pending(s, true); | |
1079 | if (r < 0) { | |
1080 | source_free(s); | |
1081 | return r; | |
1082 | } | |
1083 | ||
a71fe8b8 LP |
1084 | if (ret) |
1085 | *ret = s; | |
1086 | ||
fd38203a LP |
1087 | return 0; |
1088 | } | |
1089 | ||
6e9feda3 LP |
1090 | _public_ int sd_event_add_post( |
1091 | sd_event *e, | |
1092 | sd_event_source **ret, | |
1093 | sd_event_handler_t callback, | |
1094 | void *userdata) { | |
1095 | ||
1096 | sd_event_source *s; | |
1097 | int r; | |
1098 | ||
1099 | assert_return(e, -EINVAL); | |
1100 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1101 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1102 | assert_return(!event_pid_changed(e), -ECHILD); | |
1103 | ||
1104 | r = set_ensure_allocated(&e->post_sources, trivial_hash_func, trivial_compare_func); | |
1105 | if (r < 0) | |
1106 | return r; | |
1107 | ||
a71fe8b8 | 1108 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1109 | if (!s) |
1110 | return -ENOMEM; | |
1111 | ||
1112 | s->post.callback = callback; | |
1113 | s->userdata = userdata; | |
1114 | s->enabled = SD_EVENT_ON; | |
1115 | ||
1116 | r = set_put(e->post_sources, s); | |
1117 | if (r < 0) { | |
1118 | source_free(s); | |
1119 | return r; | |
1120 | } | |
1121 | ||
a71fe8b8 LP |
1122 | if (ret) |
1123 | *ret = s; | |
1124 | ||
6e9feda3 LP |
1125 | return 0; |
1126 | } | |
1127 | ||
6203e07a | 1128 | _public_ int sd_event_add_exit( |
305f78bf | 1129 | sd_event *e, |
151b9b96 | 1130 | sd_event_source **ret, |
718db961 | 1131 | sd_event_handler_t callback, |
151b9b96 | 1132 | void *userdata) { |
305f78bf | 1133 | |
da7e457c LP |
1134 | sd_event_source *s; |
1135 | int r; | |
1136 | ||
1137 | assert_return(e, -EINVAL); | |
1138 | assert_return(callback, -EINVAL); | |
1139 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1140 | assert_return(!event_pid_changed(e), -ECHILD); | |
1141 | ||
6203e07a LP |
1142 | if (!e->exit) { |
1143 | e->exit = prioq_new(exit_prioq_compare); | |
1144 | if (!e->exit) | |
da7e457c LP |
1145 | return -ENOMEM; |
1146 | } | |
1147 | ||
a71fe8b8 | 1148 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1149 | if (!s) |
da7e457c | 1150 | return -ENOMEM; |
fd38203a | 1151 | |
6203e07a | 1152 | s->exit.callback = callback; |
da7e457c | 1153 | s->userdata = userdata; |
6203e07a | 1154 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1155 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1156 | |
6203e07a | 1157 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1158 | if (r < 0) { |
1159 | source_free(s); | |
1160 | return r; | |
1161 | } | |
1162 | ||
a71fe8b8 LP |
1163 | if (ret) |
1164 | *ret = s; | |
1165 | ||
da7e457c LP |
1166 | return 0; |
1167 | } | |
1168 | ||
f7262a9f | 1169 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
da7e457c LP |
1170 | assert_return(s, NULL); |
1171 | ||
1172 | assert(s->n_ref >= 1); | |
1173 | s->n_ref++; | |
fd38203a LP |
1174 | |
1175 | return s; | |
1176 | } | |
1177 | ||
f7262a9f | 1178 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1179 | |
1180 | if (!s) | |
1181 | return NULL; | |
fd38203a | 1182 | |
da7e457c LP |
1183 | assert(s->n_ref >= 1); |
1184 | s->n_ref--; | |
1185 | ||
12179984 LP |
1186 | if (s->n_ref <= 0) { |
1187 | /* Here's a special hack: when we are called from a | |
1188 | * dispatch handler we won't free the event source | |
1189 | * immediately, but we will detach the fd from the | |
1190 | * epoll. This way it is safe for the caller to unref | |
1191 | * the event source and immediately close the fd, but | |
1192 | * we still retain a valid event source object after | |
1193 | * the callback. */ | |
1194 | ||
1195 | if (s->dispatching) { | |
1196 | if (s->type == SOURCE_IO) | |
1197 | source_io_unregister(s); | |
a71fe8b8 LP |
1198 | |
1199 | source_disconnect(s); | |
12179984 LP |
1200 | } else |
1201 | source_free(s); | |
1202 | } | |
fd38203a LP |
1203 | |
1204 | return NULL; | |
1205 | } | |
1206 | ||
adcc4ca3 | 1207 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1208 | assert_return(s, NULL); |
eaa3cbef LP |
1209 | |
1210 | return s->event; | |
1211 | } | |
1212 | ||
f7262a9f | 1213 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1214 | assert_return(s, -EINVAL); |
6203e07a | 1215 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1216 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1217 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1218 | |
1219 | return s->pending; | |
1220 | } | |
1221 | ||
f7262a9f | 1222 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1223 | assert_return(s, -EINVAL); |
1224 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1225 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1226 | |
1227 | return s->io.fd; | |
1228 | } | |
1229 | ||
30caf8f3 LP |
1230 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1231 | int r; | |
1232 | ||
1233 | assert_return(s, -EINVAL); | |
1234 | assert_return(fd >= 0, -EINVAL); | |
1235 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1236 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1237 | ||
1238 | if (s->io.fd == fd) | |
1239 | return 0; | |
1240 | ||
1241 | if (s->enabled == SD_EVENT_OFF) { | |
1242 | s->io.fd = fd; | |
1243 | s->io.registered = false; | |
1244 | } else { | |
1245 | int saved_fd; | |
1246 | ||
1247 | saved_fd = s->io.fd; | |
1248 | assert(s->io.registered); | |
1249 | ||
1250 | s->io.fd = fd; | |
1251 | s->io.registered = false; | |
1252 | ||
1253 | r = source_io_register(s, s->enabled, s->io.events); | |
1254 | if (r < 0) { | |
1255 | s->io.fd = saved_fd; | |
1256 | s->io.registered = true; | |
1257 | return r; | |
1258 | } | |
1259 | ||
1260 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1261 | } | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
f7262a9f | 1266 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1267 | assert_return(s, -EINVAL); |
1268 | assert_return(events, -EINVAL); | |
1269 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1270 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1271 | |
1272 | *events = s->io.events; | |
1273 | return 0; | |
1274 | } | |
1275 | ||
f7262a9f | 1276 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1277 | int r; |
1278 | ||
305f78bf LP |
1279 | assert_return(s, -EINVAL); |
1280 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1281 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1282 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1283 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1284 | |
1285 | if (s->io.events == events) | |
1286 | return 0; | |
1287 | ||
baf76283 | 1288 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1289 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1290 | if (r < 0) |
1291 | return r; | |
1292 | } | |
1293 | ||
1294 | s->io.events = events; | |
503f39c3 | 1295 | source_set_pending(s, false); |
fd38203a LP |
1296 | |
1297 | return 0; | |
1298 | } | |
1299 | ||
f7262a9f | 1300 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1301 | assert_return(s, -EINVAL); |
1302 | assert_return(revents, -EINVAL); | |
1303 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1304 | assert_return(s->pending, -ENODATA); | |
1305 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1306 | |
1307 | *revents = s->io.revents; | |
1308 | return 0; | |
1309 | } | |
1310 | ||
f7262a9f | 1311 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1312 | assert_return(s, -EINVAL); |
1313 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1314 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1315 | |
1316 | return s->signal.sig; | |
1317 | } | |
1318 | ||
31927c16 | 1319 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1320 | assert_return(s, -EINVAL); |
1321 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1322 | |
1323 | return s->priority; | |
1324 | } | |
1325 | ||
31927c16 | 1326 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
305f78bf | 1327 | assert_return(s, -EINVAL); |
da7e457c | 1328 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1329 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1330 | |
1331 | if (s->priority == priority) | |
1332 | return 0; | |
1333 | ||
1334 | s->priority = priority; | |
1335 | ||
1336 | if (s->pending) | |
c2ba3ad6 | 1337 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1338 | |
1339 | if (s->prepare) | |
c2ba3ad6 | 1340 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1341 | |
6203e07a LP |
1342 | if (s->type == SOURCE_EXIT) |
1343 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1344 | |
fd38203a LP |
1345 | return 0; |
1346 | } | |
1347 | ||
f7262a9f | 1348 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1349 | assert_return(s, -EINVAL); |
1350 | assert_return(m, -EINVAL); | |
1351 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1352 | |
baf76283 | 1353 | *m = s->enabled; |
fd38203a LP |
1354 | return 0; |
1355 | } | |
1356 | ||
f7262a9f | 1357 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1358 | int r; |
1359 | ||
305f78bf LP |
1360 | assert_return(s, -EINVAL); |
1361 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
305f78bf | 1362 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1363 | |
cc567911 LP |
1364 | /* If we are dead anyway, we are fine with turning off |
1365 | * sources, but everything else needs to fail. */ | |
1366 | if (s->event->state == SD_EVENT_FINISHED) | |
1367 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1368 | ||
baf76283 | 1369 | if (s->enabled == m) |
fd38203a LP |
1370 | return 0; |
1371 | ||
baf76283 | 1372 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1373 | |
1374 | switch (s->type) { | |
1375 | ||
1376 | case SOURCE_IO: | |
1377 | r = source_io_unregister(s); | |
1378 | if (r < 0) | |
1379 | return r; | |
1380 | ||
baf76283 | 1381 | s->enabled = m; |
fd38203a LP |
1382 | break; |
1383 | ||
6a0f1f6d LP |
1384 | case SOURCE_TIME_REALTIME: |
1385 | case SOURCE_TIME_MONOTONIC: | |
1386 | case SOURCE_TIME_REALTIME_ALARM: | |
1387 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1388 | struct clock_data *d; | |
fd38203a | 1389 | |
baf76283 | 1390 | s->enabled = m; |
6a0f1f6d LP |
1391 | d = event_get_clock_data(s->event, s->type); |
1392 | assert(d); | |
1393 | ||
1394 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1395 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a | 1396 | break; |
6a0f1f6d | 1397 | } |
fd38203a LP |
1398 | |
1399 | case SOURCE_SIGNAL: | |
baf76283 LP |
1400 | s->enabled = m; |
1401 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { | |
fd38203a LP |
1402 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
1403 | event_update_signal_fd(s->event); | |
1404 | } | |
1405 | ||
1406 | break; | |
1407 | ||
1408 | case SOURCE_CHILD: | |
baf76283 | 1409 | s->enabled = m; |
fd38203a | 1410 | |
baf76283 LP |
1411 | assert(s->event->n_enabled_child_sources > 0); |
1412 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
1413 | |
1414 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1415 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
1416 | event_update_signal_fd(s->event); | |
1417 | } | |
1418 | ||
1419 | break; | |
1420 | ||
6203e07a | 1421 | case SOURCE_EXIT: |
305f78bf | 1422 | s->enabled = m; |
6203e07a | 1423 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1424 | break; |
1425 | ||
1426 | case SOURCE_DEFER: | |
6e9feda3 | 1427 | case SOURCE_POST: |
baf76283 | 1428 | s->enabled = m; |
fd38203a | 1429 | break; |
9d3e3aa5 | 1430 | |
6a0f1f6d | 1431 | default: |
9d3e3aa5 | 1432 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1433 | } |
1434 | ||
1435 | } else { | |
1436 | switch (s->type) { | |
1437 | ||
1438 | case SOURCE_IO: | |
1439 | r = source_io_register(s, m, s->io.events); | |
1440 | if (r < 0) | |
1441 | return r; | |
1442 | ||
baf76283 | 1443 | s->enabled = m; |
fd38203a LP |
1444 | break; |
1445 | ||
6a0f1f6d LP |
1446 | case SOURCE_TIME_REALTIME: |
1447 | case SOURCE_TIME_MONOTONIC: | |
1448 | case SOURCE_TIME_REALTIME_ALARM: | |
1449 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1450 | struct clock_data *d; | |
fd38203a | 1451 | |
baf76283 | 1452 | s->enabled = m; |
6a0f1f6d LP |
1453 | d = event_get_clock_data(s->event, s->type); |
1454 | assert(d); | |
1455 | ||
1456 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1457 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a | 1458 | break; |
6a0f1f6d | 1459 | } |
fd38203a LP |
1460 | |
1461 | case SOURCE_SIGNAL: | |
baf76283 | 1462 | s->enabled = m; |
fd38203a | 1463 | |
baf76283 | 1464 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { |
fd38203a LP |
1465 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
1466 | event_update_signal_fd(s->event); | |
1467 | } | |
1468 | break; | |
1469 | ||
1470 | case SOURCE_CHILD: | |
baf76283 LP |
1471 | if (s->enabled == SD_EVENT_OFF) { |
1472 | s->event->n_enabled_child_sources++; | |
fd38203a LP |
1473 | |
1474 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1475 | assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0); | |
1476 | event_update_signal_fd(s->event); | |
1477 | } | |
1478 | } | |
7a0d4a3d DH |
1479 | |
1480 | s->enabled = m; | |
fd38203a LP |
1481 | break; |
1482 | ||
6203e07a | 1483 | case SOURCE_EXIT: |
305f78bf | 1484 | s->enabled = m; |
6203e07a | 1485 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1486 | break; |
1487 | ||
1488 | case SOURCE_DEFER: | |
6e9feda3 | 1489 | case SOURCE_POST: |
baf76283 | 1490 | s->enabled = m; |
fd38203a | 1491 | break; |
9d3e3aa5 | 1492 | |
6a0f1f6d | 1493 | default: |
9d3e3aa5 | 1494 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1495 | } |
1496 | } | |
1497 | ||
1498 | if (s->pending) | |
1499 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1500 | ||
1501 | if (s->prepare) | |
1502 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1503 | ||
1504 | return 0; | |
1505 | } | |
1506 | ||
f7262a9f | 1507 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1508 | assert_return(s, -EINVAL); |
1509 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1510 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1511 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1512 | |
1513 | *usec = s->time.next; | |
1514 | return 0; | |
1515 | } | |
1516 | ||
f7262a9f | 1517 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1518 | struct clock_data *d; |
1519 | ||
305f78bf LP |
1520 | assert_return(s, -EINVAL); |
1521 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1522 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1523 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1524 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1525 | |
fd38203a | 1526 | s->time.next = usec; |
2576a19e | 1527 | |
0cc1125a | 1528 | source_set_pending(s, false); |
fd38203a | 1529 | |
6a0f1f6d LP |
1530 | d = event_get_clock_data(s->event, s->type); |
1531 | assert(d); | |
1532 | ||
1533 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1534 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a LP |
1535 | |
1536 | return 0; | |
1537 | } | |
1538 | ||
f7262a9f | 1539 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1540 | assert_return(s, -EINVAL); |
1541 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1542 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1543 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1544 | ||
1545 | *usec = s->time.accuracy; | |
1546 | return 0; | |
1547 | } | |
1548 | ||
f7262a9f | 1549 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1550 | struct clock_data *d; |
1551 | ||
305f78bf LP |
1552 | assert_return(s, -EINVAL); |
1553 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1554 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1555 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1556 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1557 | |
1558 | if (usec == 0) | |
1559 | usec = DEFAULT_ACCURACY_USEC; | |
1560 | ||
eaa3cbef LP |
1561 | s->time.accuracy = usec; |
1562 | ||
2576a19e LP |
1563 | source_set_pending(s, false); |
1564 | ||
6a0f1f6d LP |
1565 | d = event_get_clock_data(s->event, s->type); |
1566 | assert(d); | |
1567 | ||
1568 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
1569 | ||
1570 | return 0; | |
1571 | } | |
1572 | ||
1573 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1574 | assert_return(s, -EINVAL); | |
1575 | assert_return(clock, -EINVAL); | |
1576 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1577 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1578 | |
6a0f1f6d | 1579 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1580 | return 0; |
1581 | } | |
1582 | ||
f7262a9f | 1583 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1584 | assert_return(s, -EINVAL); |
1585 | assert_return(pid, -EINVAL); | |
1586 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1587 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1588 | ||
1589 | *pid = s->child.pid; | |
1590 | return 0; | |
1591 | } | |
1592 | ||
718db961 | 1593 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1594 | int r; |
1595 | ||
da7e457c | 1596 | assert_return(s, -EINVAL); |
6203e07a | 1597 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1598 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1599 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1600 | |
1601 | if (s->prepare == callback) | |
1602 | return 0; | |
1603 | ||
1604 | if (callback && s->prepare) { | |
1605 | s->prepare = callback; | |
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1610 | if (r < 0) | |
1611 | return r; | |
1612 | ||
1613 | s->prepare = callback; | |
1614 | ||
1615 | if (callback) { | |
1616 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1617 | if (r < 0) | |
1618 | return r; | |
1619 | } else | |
1620 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1621 | ||
1622 | return 0; | |
1623 | } | |
1624 | ||
f7262a9f | 1625 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1626 | assert_return(s, NULL); |
fd38203a LP |
1627 | |
1628 | return s->userdata; | |
1629 | } | |
1630 | ||
8f726607 LP |
1631 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1632 | void *ret; | |
1633 | ||
1634 | assert_return(s, NULL); | |
1635 | ||
1636 | ret = s->userdata; | |
1637 | s->userdata = userdata; | |
1638 | ||
1639 | return ret; | |
1640 | } | |
1641 | ||
c2ba3ad6 LP |
1642 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1643 | usec_t c; | |
1644 | assert(e); | |
1645 | assert(a <= b); | |
1646 | ||
1647 | if (a <= 0) | |
1648 | return 0; | |
1649 | ||
1650 | if (b <= a + 1) | |
1651 | return a; | |
1652 | ||
52444dc4 LP |
1653 | initialize_perturb(e); |
1654 | ||
c2ba3ad6 LP |
1655 | /* |
1656 | Find a good time to wake up again between times a and b. We | |
1657 | have two goals here: | |
1658 | ||
1659 | a) We want to wake up as seldom as possible, hence prefer | |
1660 | later times over earlier times. | |
1661 | ||
1662 | b) But if we have to wake up, then let's make sure to | |
1663 | dispatch as much as possible on the entire system. | |
1664 | ||
1665 | We implement this by waking up everywhere at the same time | |
850516e0 | 1666 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1667 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1668 | then we try to find the same spot in every 10s, then 1s and |
1669 | then 250ms step. Otherwise, we pick the last possible time | |
1670 | to wake up. | |
c2ba3ad6 LP |
1671 | */ |
1672 | ||
850516e0 LP |
1673 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1674 | if (c >= b) { | |
1675 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1676 | return b; | |
1677 | ||
1678 | c -= USEC_PER_MINUTE; | |
1679 | } | |
1680 | ||
ba276c81 LP |
1681 | if (c >= a) |
1682 | return c; | |
1683 | ||
1684 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1685 | if (c >= b) { | |
1686 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1687 | return b; | |
1688 | ||
1689 | c -= USEC_PER_SEC*10; | |
1690 | } | |
1691 | ||
850516e0 LP |
1692 | if (c >= a) |
1693 | return c; | |
1694 | ||
1695 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1696 | if (c >= b) { |
1697 | if (_unlikely_(c < USEC_PER_SEC)) | |
1698 | return b; | |
1699 | ||
1700 | c -= USEC_PER_SEC; | |
1701 | } | |
1702 | ||
1703 | if (c >= a) | |
1704 | return c; | |
1705 | ||
1706 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1707 | if (c >= b) { | |
1708 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1709 | return b; | |
1710 | ||
1711 | c -= USEC_PER_MSEC*250; | |
1712 | } | |
1713 | ||
1714 | if (c >= a) | |
1715 | return c; | |
1716 | ||
1717 | return b; | |
1718 | } | |
1719 | ||
fd38203a LP |
1720 | static int event_arm_timer( |
1721 | sd_event *e, | |
6a0f1f6d | 1722 | struct clock_data *d) { |
fd38203a LP |
1723 | |
1724 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1725 | sd_event_source *a, *b; |
1726 | usec_t t; | |
fd38203a LP |
1727 | int r; |
1728 | ||
cde93897 | 1729 | assert(e); |
6a0f1f6d | 1730 | assert(d); |
fd38203a | 1731 | |
6a0f1f6d | 1732 | a = prioq_peek(d->earliest); |
72aedc1e LP |
1733 | if (!a || a->enabled == SD_EVENT_OFF) { |
1734 | ||
6a0f1f6d | 1735 | if (d->fd < 0) |
c57b5ca3 LP |
1736 | return 0; |
1737 | ||
6a0f1f6d | 1738 | if (d->next == (usec_t) -1) |
72aedc1e LP |
1739 | return 0; |
1740 | ||
1741 | /* disarm */ | |
6a0f1f6d | 1742 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1743 | if (r < 0) |
1744 | return r; | |
1745 | ||
6a0f1f6d | 1746 | d->next = (usec_t) -1; |
fd38203a | 1747 | return 0; |
72aedc1e | 1748 | } |
fd38203a | 1749 | |
6a0f1f6d | 1750 | b = prioq_peek(d->latest); |
baf76283 | 1751 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1752 | |
1753 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
6a0f1f6d | 1754 | if (d->next == t) |
fd38203a LP |
1755 | return 0; |
1756 | ||
6a0f1f6d | 1757 | assert_se(d->fd >= 0); |
fd38203a | 1758 | |
c2ba3ad6 | 1759 | if (t == 0) { |
fd38203a LP |
1760 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1761 | its.it_value.tv_sec = 0; | |
1762 | its.it_value.tv_nsec = 1; | |
1763 | } else | |
c2ba3ad6 | 1764 | timespec_store(&its.it_value, t); |
fd38203a | 1765 | |
6a0f1f6d | 1766 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 1767 | if (r < 0) |
cde93897 | 1768 | return -errno; |
fd38203a | 1769 | |
6a0f1f6d | 1770 | d->next = t; |
fd38203a LP |
1771 | return 0; |
1772 | } | |
1773 | ||
9a800b56 | 1774 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
1775 | assert(e); |
1776 | assert(s); | |
1777 | assert(s->type == SOURCE_IO); | |
1778 | ||
9a800b56 LP |
1779 | /* If the event source was already pending, we just OR in the |
1780 | * new revents, otherwise we reset the value. The ORing is | |
1781 | * necessary to handle EPOLLONESHOT events properly where | |
1782 | * readability might happen independently of writability, and | |
1783 | * we need to keep track of both */ | |
1784 | ||
1785 | if (s->pending) | |
1786 | s->io.revents |= revents; | |
1787 | else | |
1788 | s->io.revents = revents; | |
fd38203a | 1789 | |
fd38203a LP |
1790 | return source_set_pending(s, true); |
1791 | } | |
1792 | ||
72aedc1e | 1793 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
1794 | uint64_t x; |
1795 | ssize_t ss; | |
1796 | ||
1797 | assert(e); | |
da7e457c | 1798 | assert(fd >= 0); |
72aedc1e | 1799 | |
305f78bf | 1800 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1801 | |
1802 | ss = read(fd, &x, sizeof(x)); | |
1803 | if (ss < 0) { | |
1804 | if (errno == EAGAIN || errno == EINTR) | |
1805 | return 0; | |
1806 | ||
1807 | return -errno; | |
1808 | } | |
1809 | ||
8d35dae7 | 1810 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
1811 | return -EIO; |
1812 | ||
cde93897 LP |
1813 | if (next) |
1814 | *next = (usec_t) -1; | |
72aedc1e | 1815 | |
fd38203a LP |
1816 | return 0; |
1817 | } | |
1818 | ||
305f78bf LP |
1819 | static int process_timer( |
1820 | sd_event *e, | |
1821 | usec_t n, | |
6a0f1f6d | 1822 | struct clock_data *d) { |
305f78bf | 1823 | |
fd38203a LP |
1824 | sd_event_source *s; |
1825 | int r; | |
1826 | ||
1827 | assert(e); | |
6a0f1f6d | 1828 | assert(d); |
fd38203a LP |
1829 | |
1830 | for (;;) { | |
6a0f1f6d | 1831 | s = prioq_peek(d->earliest); |
fd38203a LP |
1832 | if (!s || |
1833 | s->time.next > n || | |
baf76283 | 1834 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1835 | s->pending) |
1836 | break; | |
1837 | ||
1838 | r = source_set_pending(s, true); | |
1839 | if (r < 0) | |
1840 | return r; | |
1841 | ||
6a0f1f6d LP |
1842 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
1843 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a LP |
1844 | } |
1845 | ||
1846 | return 0; | |
1847 | } | |
1848 | ||
1849 | static int process_child(sd_event *e) { | |
1850 | sd_event_source *s; | |
1851 | Iterator i; | |
1852 | int r; | |
1853 | ||
1854 | assert(e); | |
1855 | ||
c2ba3ad6 LP |
1856 | e->need_process_child = false; |
1857 | ||
fd38203a LP |
1858 | /* |
1859 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1860 | + WNOHANG for each PID we wait for, instead of using | |
1861 | P_ALL. This is because we only want to get child | |
1862 | information of very specific child processes, and not all | |
1863 | of them. We might not have processed the SIGCHLD even of a | |
1864 | previous invocation and we don't want to maintain a | |
1865 | unbounded *per-child* event queue, hence we really don't | |
1866 | want anything flushed out of the kernel's queue that we | |
1867 | don't care about. Since this is O(n) this means that if you | |
1868 | have a lot of processes you probably want to handle SIGCHLD | |
1869 | yourself. | |
08cd1552 LP |
1870 | |
1871 | We do not reap the children here (by using WNOWAIT), this | |
1872 | is only done after the event source is dispatched so that | |
1873 | the callback still sees the process as a zombie. | |
fd38203a LP |
1874 | */ |
1875 | ||
1876 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1877 | assert(s->type == SOURCE_CHILD); | |
1878 | ||
1879 | if (s->pending) | |
1880 | continue; | |
1881 | ||
baf76283 | 1882 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1883 | continue; |
1884 | ||
1885 | zero(s->child.siginfo); | |
08cd1552 LP |
1886 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
1887 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
1888 | if (r < 0) |
1889 | return -errno; | |
1890 | ||
1891 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
1892 | bool zombie = |
1893 | s->child.siginfo.si_code == CLD_EXITED || | |
1894 | s->child.siginfo.si_code == CLD_KILLED || | |
1895 | s->child.siginfo.si_code == CLD_DUMPED; | |
1896 | ||
1897 | if (!zombie && (s->child.options & WEXITED)) { | |
1898 | /* If the child isn't dead then let's | |
1899 | * immediately remove the state change | |
1900 | * from the queue, since there's no | |
1901 | * benefit in leaving it queued */ | |
1902 | ||
1903 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
1904 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
1905 | } | |
1906 | ||
fd38203a LP |
1907 | r = source_set_pending(s, true); |
1908 | if (r < 0) | |
1909 | return r; | |
1910 | } | |
1911 | } | |
1912 | ||
fd38203a LP |
1913 | return 0; |
1914 | } | |
1915 | ||
1916 | static int process_signal(sd_event *e, uint32_t events) { | |
fd38203a | 1917 | bool read_one = false; |
fd38203a LP |
1918 | int r; |
1919 | ||
da7e457c | 1920 | assert(e); |
0eb2e0e3 ZJS |
1921 | assert(e->signal_sources); |
1922 | ||
305f78bf | 1923 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1924 | |
1925 | for (;;) { | |
0eb2e0e3 ZJS |
1926 | struct signalfd_siginfo si; |
1927 | ssize_t ss; | |
fd38203a LP |
1928 | sd_event_source *s; |
1929 | ||
1930 | ss = read(e->signal_fd, &si, sizeof(si)); | |
1931 | if (ss < 0) { | |
1932 | if (errno == EAGAIN || errno == EINTR) | |
1933 | return read_one; | |
1934 | ||
1935 | return -errno; | |
1936 | } | |
1937 | ||
8d35dae7 | 1938 | if (_unlikely_(ss != sizeof(si))) |
fd38203a LP |
1939 | return -EIO; |
1940 | ||
1941 | read_one = true; | |
1942 | ||
0eb2e0e3 | 1943 | s = e->signal_sources[si.ssi_signo]; |
fd38203a LP |
1944 | if (si.ssi_signo == SIGCHLD) { |
1945 | r = process_child(e); | |
1946 | if (r < 0) | |
1947 | return r; | |
0eb2e0e3 | 1948 | if (r > 0 || !s) |
fd38203a | 1949 | continue; |
0eb2e0e3 | 1950 | } else |
fd38203a LP |
1951 | if (!s) |
1952 | return -EIO; | |
fd38203a LP |
1953 | |
1954 | s->signal.siginfo = si; | |
1955 | r = source_set_pending(s, true); | |
1956 | if (r < 0) | |
1957 | return r; | |
1958 | } | |
fd38203a LP |
1959 | } |
1960 | ||
1961 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 1962 | int r = 0; |
fd38203a LP |
1963 | |
1964 | assert(s); | |
6203e07a | 1965 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 1966 | |
6203e07a | 1967 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
1968 | r = source_set_pending(s, false); |
1969 | if (r < 0) | |
1970 | return r; | |
1971 | } | |
fd38203a | 1972 | |
6e9feda3 LP |
1973 | if (s->type != SOURCE_POST) { |
1974 | sd_event_source *z; | |
1975 | Iterator i; | |
1976 | ||
1977 | /* If we execute a non-post source, let's mark all | |
1978 | * post sources as pending */ | |
1979 | ||
1980 | SET_FOREACH(z, s->event->post_sources, i) { | |
1981 | if (z->enabled == SD_EVENT_OFF) | |
1982 | continue; | |
1983 | ||
1984 | r = source_set_pending(z, true); | |
1985 | if (r < 0) | |
1986 | return r; | |
1987 | } | |
1988 | } | |
1989 | ||
baf76283 LP |
1990 | if (s->enabled == SD_EVENT_ONESHOT) { |
1991 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
1992 | if (r < 0) |
1993 | return r; | |
1994 | } | |
1995 | ||
12179984 | 1996 | s->dispatching = true; |
b7484e2a | 1997 | |
fd38203a LP |
1998 | switch (s->type) { |
1999 | ||
2000 | case SOURCE_IO: | |
2001 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2002 | break; | |
2003 | ||
6a0f1f6d LP |
2004 | case SOURCE_TIME_REALTIME: |
2005 | case SOURCE_TIME_MONOTONIC: | |
2006 | case SOURCE_TIME_REALTIME_ALARM: | |
2007 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2008 | r = s->time.callback(s, s->time.next, s->userdata); |
2009 | break; | |
2010 | ||
2011 | case SOURCE_SIGNAL: | |
2012 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2013 | break; | |
2014 | ||
08cd1552 LP |
2015 | case SOURCE_CHILD: { |
2016 | bool zombie; | |
2017 | ||
2018 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
2019 | s->child.siginfo.si_code == CLD_KILLED || | |
2020 | s->child.siginfo.si_code == CLD_DUMPED; | |
2021 | ||
fd38203a | 2022 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2023 | |
2024 | /* Now, reap the PID for good. */ | |
2025 | if (zombie) | |
2026 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2027 | ||
fd38203a | 2028 | break; |
08cd1552 | 2029 | } |
fd38203a LP |
2030 | |
2031 | case SOURCE_DEFER: | |
2032 | r = s->defer.callback(s, s->userdata); | |
2033 | break; | |
da7e457c | 2034 | |
6e9feda3 LP |
2035 | case SOURCE_POST: |
2036 | r = s->post.callback(s, s->userdata); | |
2037 | break; | |
2038 | ||
6203e07a LP |
2039 | case SOURCE_EXIT: |
2040 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2041 | break; |
9d3e3aa5 LP |
2042 | |
2043 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2044 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2045 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2046 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2047 | } |
2048 | ||
12179984 LP |
2049 | s->dispatching = false; |
2050 | ||
2051 | if (r < 0) | |
6203e07a | 2052 | log_debug("Event source %p returned error, disabling: %s", s, strerror(-r)); |
12179984 LP |
2053 | |
2054 | if (s->n_ref == 0) | |
2055 | source_free(s); | |
2056 | else if (r < 0) | |
6203e07a | 2057 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2058 | |
6203e07a | 2059 | return 1; |
fd38203a LP |
2060 | } |
2061 | ||
2062 | static int event_prepare(sd_event *e) { | |
2063 | int r; | |
2064 | ||
2065 | assert(e); | |
2066 | ||
2067 | for (;;) { | |
2068 | sd_event_source *s; | |
2069 | ||
2070 | s = prioq_peek(e->prepare); | |
baf76283 | 2071 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2072 | break; |
2073 | ||
2074 | s->prepare_iteration = e->iteration; | |
2075 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2076 | if (r < 0) | |
2077 | return r; | |
2078 | ||
2079 | assert(s->prepare); | |
12179984 LP |
2080 | |
2081 | s->dispatching = true; | |
fd38203a | 2082 | r = s->prepare(s, s->userdata); |
12179984 LP |
2083 | s->dispatching = false; |
2084 | ||
fd38203a | 2085 | if (r < 0) |
12179984 | 2086 | log_debug("Prepare callback of event source %p returned error, disabling: %s", s, strerror(-r)); |
fd38203a | 2087 | |
12179984 LP |
2088 | if (s->n_ref == 0) |
2089 | source_free(s); | |
2090 | else if (r < 0) | |
2091 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2092 | } |
2093 | ||
2094 | return 0; | |
2095 | } | |
2096 | ||
6203e07a | 2097 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2098 | sd_event_source *p; |
2099 | int r; | |
2100 | ||
2101 | assert(e); | |
2102 | ||
6203e07a | 2103 | p = prioq_peek(e->exit); |
baf76283 | 2104 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2105 | e->state = SD_EVENT_FINISHED; |
2106 | return 0; | |
2107 | } | |
2108 | ||
2109 | sd_event_ref(e); | |
2110 | e->iteration++; | |
6203e07a | 2111 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2112 | |
2113 | r = source_dispatch(p); | |
2114 | ||
2115 | e->state = SD_EVENT_PASSIVE; | |
2116 | sd_event_unref(e); | |
2117 | ||
2118 | return r; | |
2119 | } | |
2120 | ||
c2ba3ad6 LP |
2121 | static sd_event_source* event_next_pending(sd_event *e) { |
2122 | sd_event_source *p; | |
2123 | ||
da7e457c LP |
2124 | assert(e); |
2125 | ||
c2ba3ad6 LP |
2126 | p = prioq_peek(e->pending); |
2127 | if (!p) | |
2128 | return NULL; | |
2129 | ||
baf76283 | 2130 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2131 | return NULL; |
2132 | ||
2133 | return p; | |
2134 | } | |
2135 | ||
cde93897 LP |
2136 | static int arm_watchdog(sd_event *e) { |
2137 | struct itimerspec its = {}; | |
2138 | usec_t t; | |
2139 | int r; | |
2140 | ||
2141 | assert(e); | |
2142 | assert(e->watchdog_fd >= 0); | |
2143 | ||
2144 | t = sleep_between(e, | |
2145 | e->watchdog_last + (e->watchdog_period / 2), | |
2146 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2147 | ||
2148 | timespec_store(&its.it_value, t); | |
2149 | ||
75145780 LP |
2150 | /* Make sure we never set the watchdog to 0, which tells the |
2151 | * kernel to disable it. */ | |
2152 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2153 | its.it_value.tv_nsec = 1; | |
2154 | ||
cde93897 LP |
2155 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2156 | if (r < 0) | |
2157 | return -errno; | |
2158 | ||
2159 | return 0; | |
2160 | } | |
2161 | ||
2162 | static int process_watchdog(sd_event *e) { | |
2163 | assert(e); | |
2164 | ||
2165 | if (!e->watchdog) | |
2166 | return 0; | |
2167 | ||
2168 | /* Don't notify watchdog too often */ | |
2169 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2170 | return 0; | |
2171 | ||
2172 | sd_notify(false, "WATCHDOG=1"); | |
2173 | e->watchdog_last = e->timestamp.monotonic; | |
2174 | ||
2175 | return arm_watchdog(e); | |
2176 | } | |
2177 | ||
f7262a9f | 2178 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
15b38f93 LP |
2179 | struct epoll_event *ev_queue; |
2180 | unsigned ev_queue_max; | |
fd38203a | 2181 | sd_event_source *p; |
305f78bf | 2182 | int r, i, m; |
eec6022c | 2183 | bool timedout; |
fd38203a | 2184 | |
da7e457c LP |
2185 | assert_return(e, -EINVAL); |
2186 | assert_return(!event_pid_changed(e), -ECHILD); | |
2187 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2188 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2189 | ||
6203e07a LP |
2190 | if (e->exit_requested) |
2191 | return dispatch_exit(e); | |
fd38203a | 2192 | |
da7e457c | 2193 | sd_event_ref(e); |
fd38203a | 2194 | e->iteration++; |
da7e457c | 2195 | e->state = SD_EVENT_RUNNING; |
fd38203a LP |
2196 | |
2197 | r = event_prepare(e); | |
2198 | if (r < 0) | |
da7e457c | 2199 | goto finish; |
fd38203a | 2200 | |
6a0f1f6d LP |
2201 | r = event_arm_timer(e, &e->realtime); |
2202 | if (r < 0) | |
2203 | goto finish; | |
2204 | ||
2205 | r = event_arm_timer(e, &e->monotonic); | |
2206 | if (r < 0) | |
2207 | goto finish; | |
2208 | ||
2209 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 LP |
2210 | if (r < 0) |
2211 | goto finish; | |
fd38203a | 2212 | |
6a0f1f6d | 2213 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 LP |
2214 | if (r < 0) |
2215 | goto finish; | |
fd38203a | 2216 | |
1b5995b0 LP |
2217 | if (event_next_pending(e) || e->need_process_child) |
2218 | timeout = 0; | |
6a0f1f6d | 2219 | |
15b38f93 LP |
2220 | ev_queue_max = CLAMP(e->n_sources, 1U, EPOLL_QUEUE_MAX); |
2221 | ev_queue = newa(struct epoll_event, ev_queue_max); | |
fd38203a | 2222 | |
15b38f93 | 2223 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2224 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2225 | if (m < 0) { |
ff003106 | 2226 | r = errno == EAGAIN || errno == EINTR ? 1 : -errno; |
da7e457c LP |
2227 | goto finish; |
2228 | } | |
fd38203a | 2229 | |
eec6022c LP |
2230 | timedout = m == 0; |
2231 | ||
46e8c825 | 2232 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2233 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2234 | |
2235 | for (i = 0; i < m; i++) { | |
2236 | ||
6a0f1f6d LP |
2237 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME)) |
2238 | r = flush_timer(e, e->realtime.fd, ev_queue[i].events, &e->realtime.next); | |
2239 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_MONOTONIC)) | |
2240 | r = flush_timer(e, e->monotonic.fd, ev_queue[i].events, &e->monotonic.next); | |
2241 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME_ALARM)) | |
2242 | r = flush_timer(e, e->realtime_alarm.fd, ev_queue[i].events, &e->realtime_alarm.next); | |
2243 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_BOOTTIME_ALARM)) | |
2244 | r = flush_timer(e, e->boottime_alarm.fd, ev_queue[i].events, &e->boottime_alarm.next); | |
fd38203a LP |
2245 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) |
2246 | r = process_signal(e, ev_queue[i].events); | |
79e16ce3 | 2247 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2248 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
fd38203a LP |
2249 | else |
2250 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2251 | ||
2252 | if (r < 0) | |
da7e457c | 2253 | goto finish; |
fd38203a LP |
2254 | } |
2255 | ||
cde93897 LP |
2256 | r = process_watchdog(e); |
2257 | if (r < 0) | |
2258 | goto finish; | |
2259 | ||
6a0f1f6d LP |
2260 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2261 | if (r < 0) | |
2262 | goto finish; | |
2263 | ||
2264 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); | |
2265 | if (r < 0) | |
2266 | goto finish; | |
2267 | ||
2268 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2269 | if (r < 0) |
da7e457c | 2270 | goto finish; |
fd38203a | 2271 | |
6a0f1f6d | 2272 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2273 | if (r < 0) |
da7e457c | 2274 | goto finish; |
fd38203a | 2275 | |
c2ba3ad6 | 2276 | if (e->need_process_child) { |
fd38203a LP |
2277 | r = process_child(e); |
2278 | if (r < 0) | |
da7e457c | 2279 | goto finish; |
fd38203a LP |
2280 | } |
2281 | ||
c2ba3ad6 | 2282 | p = event_next_pending(e); |
da7e457c | 2283 | if (!p) { |
eec6022c | 2284 | r = !timedout; |
da7e457c LP |
2285 | goto finish; |
2286 | } | |
2287 | ||
2288 | r = source_dispatch(p); | |
fd38203a | 2289 | |
da7e457c LP |
2290 | finish: |
2291 | e->state = SD_EVENT_PASSIVE; | |
2292 | sd_event_unref(e); | |
2293 | ||
2294 | return r; | |
fd38203a LP |
2295 | } |
2296 | ||
f7262a9f | 2297 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2298 | int r; |
2299 | ||
da7e457c LP |
2300 | assert_return(e, -EINVAL); |
2301 | assert_return(!event_pid_changed(e), -ECHILD); | |
2302 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2303 | ||
2304 | sd_event_ref(e); | |
fd38203a | 2305 | |
da7e457c | 2306 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2307 | r = sd_event_run(e, (uint64_t) -1); |
2308 | if (r < 0) | |
da7e457c | 2309 | goto finish; |
fd38203a LP |
2310 | } |
2311 | ||
6203e07a | 2312 | r = e->exit_code; |
da7e457c LP |
2313 | |
2314 | finish: | |
2315 | sd_event_unref(e); | |
2316 | return r; | |
fd38203a LP |
2317 | } |
2318 | ||
f7262a9f | 2319 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2320 | assert_return(e, -EINVAL); |
2321 | assert_return(!event_pid_changed(e), -ECHILD); | |
2322 | ||
2323 | return e->state; | |
2324 | } | |
2325 | ||
6203e07a | 2326 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2327 | assert_return(e, -EINVAL); |
6203e07a | 2328 | assert_return(code, -EINVAL); |
da7e457c | 2329 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2330 | |
6203e07a LP |
2331 | if (!e->exit_requested) |
2332 | return -ENODATA; | |
2333 | ||
2334 | *code = e->exit_code; | |
2335 | return 0; | |
fd38203a LP |
2336 | } |
2337 | ||
6203e07a | 2338 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2339 | assert_return(e, -EINVAL); |
2340 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2341 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2342 | |
6203e07a LP |
2343 | e->exit_requested = true; |
2344 | e->exit_code = code; | |
2345 | ||
fd38203a LP |
2346 | return 0; |
2347 | } | |
46e8c825 | 2348 | |
6a0f1f6d | 2349 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2350 | assert_return(e, -EINVAL); |
2351 | assert_return(usec, -EINVAL); | |
46e8c825 LP |
2352 | assert_return(!event_pid_changed(e), -ECHILD); |
2353 | ||
6a0f1f6d LP |
2354 | /* If we haven't run yet, just get the actual time */ |
2355 | if (!dual_timestamp_is_set(&e->timestamp)) | |
2356 | return -ENODATA; | |
46e8c825 | 2357 | |
6a0f1f6d LP |
2358 | switch (clock) { |
2359 | ||
2360 | case CLOCK_REALTIME: | |
2361 | case CLOCK_REALTIME_ALARM: | |
2362 | *usec = e->timestamp.realtime; | |
2363 | break; | |
2364 | ||
2365 | case CLOCK_MONOTONIC: | |
2366 | *usec = e->timestamp.monotonic; | |
2367 | break; | |
2368 | ||
2369 | case CLOCK_BOOTTIME_ALARM: | |
2370 | *usec = e->timestamp_boottime; | |
2371 | break; | |
2372 | } | |
46e8c825 | 2373 | |
46e8c825 LP |
2374 | return 0; |
2375 | } | |
afc6adb5 LP |
2376 | |
2377 | _public_ int sd_event_default(sd_event **ret) { | |
2378 | ||
ec202eae | 2379 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2380 | sd_event *e = NULL; |
afc6adb5 LP |
2381 | int r; |
2382 | ||
2383 | if (!ret) | |
2384 | return !!default_event; | |
2385 | ||
2386 | if (default_event) { | |
2387 | *ret = sd_event_ref(default_event); | |
2388 | return 0; | |
2389 | } | |
2390 | ||
2391 | r = sd_event_new(&e); | |
2392 | if (r < 0) | |
2393 | return r; | |
2394 | ||
2395 | e->default_event_ptr = &default_event; | |
2396 | e->tid = gettid(); | |
2397 | default_event = e; | |
2398 | ||
2399 | *ret = e; | |
2400 | return 1; | |
2401 | } | |
2402 | ||
2403 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2404 | assert_return(e, -EINVAL); | |
2405 | assert_return(tid, -EINVAL); | |
76b54375 | 2406 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2407 | |
76b54375 LP |
2408 | if (e->tid != 0) { |
2409 | *tid = e->tid; | |
2410 | return 0; | |
2411 | } | |
2412 | ||
2413 | return -ENXIO; | |
afc6adb5 | 2414 | } |
cde93897 LP |
2415 | |
2416 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2417 | int r; | |
2418 | ||
2419 | assert_return(e, -EINVAL); | |
8f726607 | 2420 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2421 | |
2422 | if (e->watchdog == !!b) | |
2423 | return e->watchdog; | |
2424 | ||
2425 | if (b) { | |
2426 | struct epoll_event ev = {}; | |
cde93897 | 2427 | |
09812eb7 LP |
2428 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2429 | if (r <= 0) | |
cde93897 | 2430 | return r; |
cde93897 LP |
2431 | |
2432 | /* Issue first ping immediately */ | |
2433 | sd_notify(false, "WATCHDOG=1"); | |
2434 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2435 | ||
2436 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2437 | if (e->watchdog_fd < 0) | |
2438 | return -errno; | |
2439 | ||
2440 | r = arm_watchdog(e); | |
2441 | if (r < 0) | |
2442 | goto fail; | |
2443 | ||
2444 | ev.events = EPOLLIN; | |
2445 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2446 | ||
2447 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2448 | if (r < 0) { | |
2449 | r = -errno; | |
2450 | goto fail; | |
2451 | } | |
2452 | ||
2453 | } else { | |
2454 | if (e->watchdog_fd >= 0) { | |
2455 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2456 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2457 | } |
2458 | } | |
2459 | ||
2460 | e->watchdog = !!b; | |
2461 | return e->watchdog; | |
2462 | ||
2463 | fail: | |
03e334a1 | 2464 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2465 | return r; |
2466 | } | |
8f726607 LP |
2467 | |
2468 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2469 | assert_return(e, -EINVAL); | |
2470 | assert_return(!event_pid_changed(e), -ECHILD); | |
2471 | ||
2472 | return e->watchdog; | |
2473 | } |