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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 | 45 | SOURCE_TIME_REALTIME, |
a8548816 | 46 | SOURCE_TIME_BOOTTIME, |
6a0f1f6d LP |
47 | SOURCE_TIME_MONOTONIC, |
48 | SOURCE_TIME_REALTIME_ALARM, | |
49 | SOURCE_TIME_BOOTTIME_ALARM, | |
fd38203a LP |
50 | SOURCE_SIGNAL, |
51 | SOURCE_CHILD, | |
da7e457c | 52 | SOURCE_DEFER, |
6e9feda3 | 53 | SOURCE_POST, |
6203e07a | 54 | SOURCE_EXIT, |
6a0f1f6d | 55 | SOURCE_WATCHDOG, |
a71fe8b8 | 56 | _SOURCE_EVENT_SOURCE_TYPE_MAX, |
6a0f1f6d | 57 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 |
fd38203a LP |
58 | } EventSourceType; |
59 | ||
a8548816 | 60 | #define EVENT_SOURCE_IS_TIME(t) IN_SET((t), SOURCE_TIME_REALTIME, SOURCE_TIME_BOOTTIME, SOURCE_TIME_MONOTONIC, SOURCE_TIME_REALTIME_ALARM, SOURCE_TIME_BOOTTIME_ALARM) |
6a0f1f6d | 61 | |
fd38203a | 62 | struct sd_event_source { |
da7e457c | 63 | unsigned n_ref; |
fd38203a LP |
64 | |
65 | sd_event *event; | |
66 | void *userdata; | |
718db961 | 67 | sd_event_handler_t prepare; |
fd38203a | 68 | |
6a0f1f6d | 69 | EventSourceType type:5; |
baf76283 | 70 | int enabled:3; |
fd38203a | 71 | bool pending:1; |
12179984 | 72 | bool dispatching:1; |
a71fe8b8 | 73 | bool floating:1; |
fd38203a | 74 | |
31927c16 | 75 | int64_t priority; |
fd38203a LP |
76 | unsigned pending_index; |
77 | unsigned prepare_index; | |
78 | unsigned pending_iteration; | |
79 | unsigned prepare_iteration; | |
80 | ||
a71fe8b8 LP |
81 | LIST_FIELDS(sd_event_source, sources); |
82 | ||
fd38203a LP |
83 | union { |
84 | struct { | |
718db961 | 85 | sd_event_io_handler_t callback; |
fd38203a LP |
86 | int fd; |
87 | uint32_t events; | |
88 | uint32_t revents; | |
89 | bool registered:1; | |
90 | } io; | |
91 | struct { | |
718db961 | 92 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
93 | usec_t next, accuracy; |
94 | unsigned earliest_index; | |
95 | unsigned latest_index; | |
fd38203a LP |
96 | } time; |
97 | struct { | |
718db961 | 98 | sd_event_signal_handler_t callback; |
fd38203a LP |
99 | struct signalfd_siginfo siginfo; |
100 | int sig; | |
101 | } signal; | |
102 | struct { | |
718db961 | 103 | sd_event_child_handler_t callback; |
fd38203a LP |
104 | siginfo_t siginfo; |
105 | pid_t pid; | |
106 | int options; | |
107 | } child; | |
108 | struct { | |
718db961 | 109 | sd_event_handler_t callback; |
fd38203a | 110 | } defer; |
6e9feda3 LP |
111 | struct { |
112 | sd_event_handler_t callback; | |
113 | } post; | |
da7e457c | 114 | struct { |
718db961 | 115 | sd_event_handler_t callback; |
da7e457c | 116 | unsigned prioq_index; |
6203e07a | 117 | } exit; |
fd38203a LP |
118 | }; |
119 | }; | |
120 | ||
6a0f1f6d LP |
121 | struct clock_data { |
122 | int fd; | |
123 | ||
124 | /* For all clocks we maintain two priority queues each, one | |
125 | * ordered for the earliest times the events may be | |
126 | * dispatched, and one ordered by the latest times they must | |
127 | * have been dispatched. The range between the top entries in | |
128 | * the two prioqs is the time window we can freely schedule | |
129 | * wakeups in */ | |
130 | ||
131 | Prioq *earliest; | |
132 | Prioq *latest; | |
133 | usec_t next; | |
134 | }; | |
135 | ||
fd38203a | 136 | struct sd_event { |
da7e457c | 137 | unsigned n_ref; |
fd38203a LP |
138 | |
139 | int epoll_fd; | |
140 | int signal_fd; | |
cde93897 | 141 | int watchdog_fd; |
fd38203a LP |
142 | |
143 | Prioq *pending; | |
144 | Prioq *prepare; | |
c2ba3ad6 | 145 | |
a8548816 | 146 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
147 | * can add support for more clocks when the kernel learns to |
148 | * deal with them, too. */ | |
149 | struct clock_data realtime; | |
a8548816 | 150 | struct clock_data boottime; |
6a0f1f6d LP |
151 | struct clock_data monotonic; |
152 | struct clock_data realtime_alarm; | |
153 | struct clock_data boottime_alarm; | |
fd38203a | 154 | |
da7e457c LP |
155 | usec_t perturb; |
156 | ||
fd38203a LP |
157 | sigset_t sigset; |
158 | sd_event_source **signal_sources; | |
159 | ||
160 | Hashmap *child_sources; | |
baf76283 | 161 | unsigned n_enabled_child_sources; |
fd38203a | 162 | |
6e9feda3 LP |
163 | Set *post_sources; |
164 | ||
6203e07a | 165 | Prioq *exit; |
fd38203a | 166 | |
da7e457c | 167 | pid_t original_pid; |
c2ba3ad6 | 168 | |
da7e457c | 169 | unsigned iteration; |
46e8c825 | 170 | dual_timestamp timestamp; |
6a0f1f6d | 171 | usec_t timestamp_boottime; |
da7e457c | 172 | int state; |
eaa3cbef | 173 | |
6203e07a | 174 | bool exit_requested:1; |
da7e457c | 175 | bool need_process_child:1; |
cde93897 | 176 | bool watchdog:1; |
afc6adb5 | 177 | |
6203e07a LP |
178 | int exit_code; |
179 | ||
afc6adb5 LP |
180 | pid_t tid; |
181 | sd_event **default_event_ptr; | |
cde93897 LP |
182 | |
183 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
184 | |
185 | unsigned n_sources; | |
a71fe8b8 LP |
186 | |
187 | LIST_HEAD(sd_event_source, sources); | |
fd38203a LP |
188 | }; |
189 | ||
a71fe8b8 LP |
190 | static void source_disconnect(sd_event_source *s); |
191 | ||
fd38203a LP |
192 | static int pending_prioq_compare(const void *a, const void *b) { |
193 | const sd_event_source *x = a, *y = b; | |
194 | ||
195 | assert(x->pending); | |
196 | assert(y->pending); | |
197 | ||
baf76283 LP |
198 | /* Enabled ones first */ |
199 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 200 | return -1; |
baf76283 | 201 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
202 | return 1; |
203 | ||
204 | /* Lower priority values first */ | |
205 | if (x->priority < y->priority) | |
206 | return -1; | |
207 | if (x->priority > y->priority) | |
208 | return 1; | |
209 | ||
210 | /* Older entries first */ | |
211 | if (x->pending_iteration < y->pending_iteration) | |
212 | return -1; | |
213 | if (x->pending_iteration > y->pending_iteration) | |
214 | return 1; | |
215 | ||
216 | /* Stability for the rest */ | |
217 | if (x < y) | |
218 | return -1; | |
dfcd88f6 | 219 | if (x > y) |
fd38203a LP |
220 | return 1; |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static int prepare_prioq_compare(const void *a, const void *b) { | |
226 | const sd_event_source *x = a, *y = b; | |
227 | ||
228 | assert(x->prepare); | |
229 | assert(y->prepare); | |
230 | ||
231 | /* Move most recently prepared ones last, so that we can stop | |
232 | * preparing as soon as we hit one that has already been | |
233 | * prepared in the current iteration */ | |
234 | if (x->prepare_iteration < y->prepare_iteration) | |
235 | return -1; | |
236 | if (x->prepare_iteration > y->prepare_iteration) | |
237 | return 1; | |
238 | ||
baf76283 LP |
239 | /* Enabled ones first */ |
240 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 241 | return -1; |
baf76283 | 242 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
243 | return 1; |
244 | ||
245 | /* Lower priority values first */ | |
246 | if (x->priority < y->priority) | |
247 | return -1; | |
248 | if (x->priority > y->priority) | |
249 | return 1; | |
250 | ||
251 | /* Stability for the rest */ | |
252 | if (x < y) | |
253 | return -1; | |
dfcd88f6 | 254 | if (x > y) |
fd38203a LP |
255 | return 1; |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
c2ba3ad6 | 260 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
261 | const sd_event_source *x = a, *y = b; |
262 | ||
6a0f1f6d LP |
263 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
264 | assert(x->type == y->type); | |
fd38203a | 265 | |
baf76283 LP |
266 | /* Enabled ones first */ |
267 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 268 | return -1; |
baf76283 | 269 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
270 | return 1; |
271 | ||
272 | /* Move the pending ones to the end */ | |
273 | if (!x->pending && y->pending) | |
274 | return -1; | |
275 | if (x->pending && !y->pending) | |
276 | return 1; | |
277 | ||
278 | /* Order by time */ | |
279 | if (x->time.next < y->time.next) | |
280 | return -1; | |
281 | if (x->time.next > y->time.next) | |
a99badf5 | 282 | return 1; |
fd38203a LP |
283 | |
284 | /* Stability for the rest */ | |
285 | if (x < y) | |
286 | return -1; | |
dfcd88f6 | 287 | if (x > y) |
fd38203a LP |
288 | return 1; |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
c2ba3ad6 LP |
293 | static int latest_time_prioq_compare(const void *a, const void *b) { |
294 | const sd_event_source *x = a, *y = b; | |
295 | ||
6a0f1f6d LP |
296 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
297 | assert(x->type == y->type); | |
c2ba3ad6 | 298 | |
baf76283 LP |
299 | /* Enabled ones first */ |
300 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 301 | return -1; |
baf76283 | 302 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
303 | return 1; |
304 | ||
305 | /* Move the pending ones to the end */ | |
306 | if (!x->pending && y->pending) | |
307 | return -1; | |
308 | if (x->pending && !y->pending) | |
309 | return 1; | |
310 | ||
311 | /* Order by time */ | |
312 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
313 | return -1; | |
314 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
a99badf5 | 315 | return 1; |
c2ba3ad6 LP |
316 | |
317 | /* Stability for the rest */ | |
318 | if (x < y) | |
319 | return -1; | |
320 | if (x > y) | |
321 | return 1; | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
6203e07a | 326 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
327 | const sd_event_source *x = a, *y = b; |
328 | ||
6203e07a LP |
329 | assert(x->type == SOURCE_EXIT); |
330 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 331 | |
baf76283 LP |
332 | /* Enabled ones first */ |
333 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 334 | return -1; |
baf76283 | 335 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
336 | return 1; |
337 | ||
338 | /* Lower priority values first */ | |
339 | if (x->priority < y->priority) | |
340 | return -1; | |
341 | if (x->priority > y->priority) | |
342 | return 1; | |
343 | ||
344 | /* Stability for the rest */ | |
345 | if (x < y) | |
346 | return -1; | |
347 | if (x > y) | |
348 | return 1; | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
6a0f1f6d LP |
353 | static void free_clock_data(struct clock_data *d) { |
354 | assert(d); | |
355 | ||
356 | safe_close(d->fd); | |
357 | prioq_free(d->earliest); | |
358 | prioq_free(d->latest); | |
359 | } | |
360 | ||
fd38203a | 361 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
362 | sd_event_source *s; |
363 | ||
fd38203a | 364 | assert(e); |
a71fe8b8 LP |
365 | |
366 | while ((s = e->sources)) { | |
367 | assert(s->floating); | |
368 | source_disconnect(s); | |
369 | sd_event_source_unref(s); | |
370 | } | |
371 | ||
15b38f93 | 372 | assert(e->n_sources == 0); |
fd38203a | 373 | |
afc6adb5 LP |
374 | if (e->default_event_ptr) |
375 | *(e->default_event_ptr) = NULL; | |
376 | ||
03e334a1 LP |
377 | safe_close(e->epoll_fd); |
378 | safe_close(e->signal_fd); | |
03e334a1 | 379 | safe_close(e->watchdog_fd); |
cde93897 | 380 | |
6a0f1f6d | 381 | free_clock_data(&e->realtime); |
a8548816 | 382 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
383 | free_clock_data(&e->monotonic); |
384 | free_clock_data(&e->realtime_alarm); | |
385 | free_clock_data(&e->boottime_alarm); | |
386 | ||
fd38203a LP |
387 | prioq_free(e->pending); |
388 | prioq_free(e->prepare); | |
6203e07a | 389 | prioq_free(e->exit); |
fd38203a LP |
390 | |
391 | free(e->signal_sources); | |
392 | ||
393 | hashmap_free(e->child_sources); | |
6e9feda3 | 394 | set_free(e->post_sources); |
fd38203a LP |
395 | free(e); |
396 | } | |
397 | ||
f7262a9f | 398 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
399 | sd_event *e; |
400 | int r; | |
401 | ||
305f78bf | 402 | assert_return(ret, -EINVAL); |
fd38203a LP |
403 | |
404 | e = new0(sd_event, 1); | |
405 | if (!e) | |
406 | return -ENOMEM; | |
407 | ||
da7e457c | 408 | e->n_ref = 1; |
a8548816 TG |
409 | e->signal_fd = e->watchdog_fd = e->epoll_fd = e->realtime.fd = e->boottime.fd = e->monotonic.fd = e->realtime_alarm.fd = e->boottime_alarm.fd = -1; |
410 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = (usec_t) -1; | |
eaa3cbef | 411 | e->original_pid = getpid(); |
6a0f1f6d | 412 | e->perturb = (usec_t) -1; |
fd38203a LP |
413 | |
414 | assert_se(sigemptyset(&e->sigset) == 0); | |
415 | ||
416 | e->pending = prioq_new(pending_prioq_compare); | |
417 | if (!e->pending) { | |
418 | r = -ENOMEM; | |
419 | goto fail; | |
420 | } | |
421 | ||
422 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
423 | if (e->epoll_fd < 0) { | |
424 | r = -errno; | |
425 | goto fail; | |
426 | } | |
427 | ||
428 | *ret = e; | |
429 | return 0; | |
430 | ||
431 | fail: | |
432 | event_free(e); | |
433 | return r; | |
434 | } | |
435 | ||
f7262a9f | 436 | _public_ sd_event* sd_event_ref(sd_event *e) { |
305f78bf | 437 | assert_return(e, NULL); |
fd38203a | 438 | |
da7e457c LP |
439 | assert(e->n_ref >= 1); |
440 | e->n_ref++; | |
fd38203a LP |
441 | |
442 | return e; | |
443 | } | |
444 | ||
f7262a9f | 445 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
446 | |
447 | if (!e) | |
448 | return NULL; | |
fd38203a | 449 | |
da7e457c LP |
450 | assert(e->n_ref >= 1); |
451 | e->n_ref--; | |
452 | ||
453 | if (e->n_ref <= 0) | |
fd38203a LP |
454 | event_free(e); |
455 | ||
456 | return NULL; | |
457 | } | |
458 | ||
eaa3cbef LP |
459 | static bool event_pid_changed(sd_event *e) { |
460 | assert(e); | |
461 | ||
462 | /* We don't support people creating am event loop and keeping | |
463 | * it around over a fork(). Let's complain. */ | |
464 | ||
465 | return e->original_pid != getpid(); | |
466 | } | |
467 | ||
fd38203a LP |
468 | static int source_io_unregister(sd_event_source *s) { |
469 | int r; | |
470 | ||
471 | assert(s); | |
472 | assert(s->type == SOURCE_IO); | |
473 | ||
474 | if (!s->io.registered) | |
475 | return 0; | |
476 | ||
477 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
478 | if (r < 0) | |
479 | return -errno; | |
480 | ||
481 | s->io.registered = false; | |
482 | return 0; | |
483 | } | |
484 | ||
305f78bf LP |
485 | static int source_io_register( |
486 | sd_event_source *s, | |
487 | int enabled, | |
488 | uint32_t events) { | |
489 | ||
fd38203a LP |
490 | struct epoll_event ev = {}; |
491 | int r; | |
492 | ||
493 | assert(s); | |
494 | assert(s->type == SOURCE_IO); | |
baf76283 | 495 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
496 | |
497 | ev.events = events; | |
498 | ev.data.ptr = s; | |
499 | ||
baf76283 | 500 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
501 | ev.events |= EPOLLONESHOT; |
502 | ||
503 | if (s->io.registered) | |
504 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
505 | else | |
506 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
507 | ||
508 | if (r < 0) | |
509 | return -errno; | |
510 | ||
511 | s->io.registered = true; | |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
6a0f1f6d LP |
516 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
517 | ||
518 | switch (t) { | |
519 | ||
520 | case SOURCE_TIME_REALTIME: | |
521 | return CLOCK_REALTIME; | |
522 | ||
a8548816 TG |
523 | case SOURCE_TIME_BOOTTIME: |
524 | return CLOCK_BOOTTIME; | |
525 | ||
6a0f1f6d LP |
526 | case SOURCE_TIME_MONOTONIC: |
527 | return CLOCK_MONOTONIC; | |
528 | ||
529 | case SOURCE_TIME_REALTIME_ALARM: | |
530 | return CLOCK_REALTIME_ALARM; | |
531 | ||
532 | case SOURCE_TIME_BOOTTIME_ALARM: | |
533 | return CLOCK_BOOTTIME_ALARM; | |
534 | ||
535 | default: | |
536 | return (clockid_t) -1; | |
537 | } | |
538 | } | |
539 | ||
540 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
541 | ||
542 | switch (clock) { | |
543 | ||
544 | case CLOCK_REALTIME: | |
545 | return SOURCE_TIME_REALTIME; | |
546 | ||
a8548816 TG |
547 | case CLOCK_BOOTTIME: |
548 | return SOURCE_TIME_BOOTTIME; | |
549 | ||
6a0f1f6d LP |
550 | case CLOCK_MONOTONIC: |
551 | return SOURCE_TIME_MONOTONIC; | |
552 | ||
553 | case CLOCK_REALTIME_ALARM: | |
554 | return SOURCE_TIME_REALTIME_ALARM; | |
555 | ||
556 | case CLOCK_BOOTTIME_ALARM: | |
557 | return SOURCE_TIME_BOOTTIME_ALARM; | |
558 | ||
559 | default: | |
560 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
561 | } | |
562 | } | |
563 | ||
564 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
565 | assert(e); | |
566 | ||
567 | switch (t) { | |
568 | ||
569 | case SOURCE_TIME_REALTIME: | |
570 | return &e->realtime; | |
571 | ||
a8548816 TG |
572 | case SOURCE_TIME_BOOTTIME: |
573 | return &e->boottime; | |
574 | ||
6a0f1f6d LP |
575 | case SOURCE_TIME_MONOTONIC: |
576 | return &e->monotonic; | |
577 | ||
578 | case SOURCE_TIME_REALTIME_ALARM: | |
579 | return &e->realtime_alarm; | |
580 | ||
581 | case SOURCE_TIME_BOOTTIME_ALARM: | |
582 | return &e->boottime_alarm; | |
583 | ||
584 | default: | |
585 | return NULL; | |
586 | } | |
587 | } | |
588 | ||
a71fe8b8 LP |
589 | static void source_disconnect(sd_event_source *s) { |
590 | sd_event *event; | |
591 | ||
fd38203a LP |
592 | assert(s); |
593 | ||
a71fe8b8 LP |
594 | if (!s->event) |
595 | return; | |
15b38f93 | 596 | |
a71fe8b8 | 597 | assert(s->event->n_sources > 0); |
fd38203a | 598 | |
a71fe8b8 | 599 | switch (s->type) { |
fd38203a | 600 | |
a71fe8b8 LP |
601 | case SOURCE_IO: |
602 | if (s->io.fd >= 0) | |
603 | source_io_unregister(s); | |
fd38203a | 604 | |
a71fe8b8 | 605 | break; |
6a0f1f6d | 606 | |
a71fe8b8 | 607 | case SOURCE_TIME_REALTIME: |
a8548816 | 608 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
609 | case SOURCE_TIME_MONOTONIC: |
610 | case SOURCE_TIME_REALTIME_ALARM: | |
611 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
612 | struct clock_data *d; | |
fd38203a | 613 | |
a71fe8b8 LP |
614 | d = event_get_clock_data(s->event, s->type); |
615 | assert(d); | |
616 | ||
617 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
618 | prioq_remove(d->latest, s, &s->time.latest_index); | |
619 | break; | |
620 | } | |
621 | ||
622 | case SOURCE_SIGNAL: | |
623 | if (s->signal.sig > 0) { | |
624 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) | |
625 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); | |
626 | ||
627 | if (s->event->signal_sources) | |
628 | s->event->signal_sources[s->signal.sig] = NULL; | |
6a0f1f6d | 629 | } |
fd38203a | 630 | |
a71fe8b8 | 631 | break; |
fd38203a | 632 | |
a71fe8b8 LP |
633 | case SOURCE_CHILD: |
634 | if (s->child.pid > 0) { | |
635 | if (s->enabled != SD_EVENT_OFF) { | |
636 | assert(s->event->n_enabled_child_sources > 0); | |
637 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
638 | } |
639 | ||
a71fe8b8 LP |
640 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) |
641 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
fd38203a | 642 | |
a71fe8b8 LP |
643 | hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid)); |
644 | } | |
fd38203a | 645 | |
a71fe8b8 | 646 | break; |
fd38203a | 647 | |
a71fe8b8 LP |
648 | case SOURCE_DEFER: |
649 | /* nothing */ | |
650 | break; | |
fd38203a | 651 | |
a71fe8b8 LP |
652 | case SOURCE_POST: |
653 | set_remove(s->event->post_sources, s); | |
654 | break; | |
da7e457c | 655 | |
a71fe8b8 LP |
656 | case SOURCE_EXIT: |
657 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
658 | break; | |
0eb2e0e3 | 659 | |
a71fe8b8 LP |
660 | default: |
661 | assert_not_reached("Wut? I shouldn't exist."); | |
662 | } | |
6e9feda3 | 663 | |
a71fe8b8 LP |
664 | if (s->pending) |
665 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 666 | |
a71fe8b8 LP |
667 | if (s->prepare) |
668 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 669 | |
a71fe8b8 | 670 | event = s->event; |
fd38203a | 671 | |
a71fe8b8 LP |
672 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
673 | s->event = NULL; | |
674 | LIST_REMOVE(sources, event->sources, s); | |
675 | event->n_sources--; | |
fd38203a | 676 | |
a71fe8b8 LP |
677 | if (!s->floating) |
678 | sd_event_unref(event); | |
679 | } | |
680 | ||
681 | static void source_free(sd_event_source *s) { | |
682 | assert(s); | |
fd38203a | 683 | |
a71fe8b8 | 684 | source_disconnect(s); |
fd38203a LP |
685 | free(s); |
686 | } | |
687 | ||
688 | static int source_set_pending(sd_event_source *s, bool b) { | |
689 | int r; | |
690 | ||
691 | assert(s); | |
6203e07a | 692 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
693 | |
694 | if (s->pending == b) | |
695 | return 0; | |
696 | ||
697 | s->pending = b; | |
698 | ||
699 | if (b) { | |
700 | s->pending_iteration = s->event->iteration; | |
701 | ||
702 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
703 | if (r < 0) { | |
704 | s->pending = false; | |
705 | return r; | |
706 | } | |
707 | } else | |
708 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
709 | ||
6a0f1f6d LP |
710 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
711 | struct clock_data *d; | |
712 | ||
713 | d = event_get_clock_data(s->event, s->type); | |
714 | assert(d); | |
715 | ||
716 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
717 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
2576a19e LP |
718 | } |
719 | ||
fd38203a LP |
720 | return 0; |
721 | } | |
722 | ||
a71fe8b8 | 723 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
724 | sd_event_source *s; |
725 | ||
726 | assert(e); | |
727 | ||
728 | s = new0(sd_event_source, 1); | |
729 | if (!s) | |
730 | return NULL; | |
731 | ||
da7e457c | 732 | s->n_ref = 1; |
a71fe8b8 | 733 | s->event = e; |
4a134c49 | 734 | s->floating = floating; |
fd38203a | 735 | s->type = type; |
fd38203a | 736 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
737 | |
738 | if (!floating) | |
739 | sd_event_ref(e); | |
fd38203a | 740 | |
a71fe8b8 | 741 | LIST_PREPEND(sources, e->sources, s); |
15b38f93 LP |
742 | e->n_sources ++; |
743 | ||
fd38203a LP |
744 | return s; |
745 | } | |
746 | ||
f7262a9f | 747 | _public_ int sd_event_add_io( |
fd38203a | 748 | sd_event *e, |
151b9b96 | 749 | sd_event_source **ret, |
fd38203a LP |
750 | int fd, |
751 | uint32_t events, | |
718db961 | 752 | sd_event_io_handler_t callback, |
151b9b96 | 753 | void *userdata) { |
fd38203a LP |
754 | |
755 | sd_event_source *s; | |
756 | int r; | |
757 | ||
305f78bf LP |
758 | assert_return(e, -EINVAL); |
759 | assert_return(fd >= 0, -EINVAL); | |
2a16a986 | 760 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 761 | assert_return(callback, -EINVAL); |
da7e457c | 762 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 763 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 764 | |
a71fe8b8 | 765 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
766 | if (!s) |
767 | return -ENOMEM; | |
768 | ||
769 | s->io.fd = fd; | |
770 | s->io.events = events; | |
771 | s->io.callback = callback; | |
772 | s->userdata = userdata; | |
baf76283 | 773 | s->enabled = SD_EVENT_ON; |
fd38203a | 774 | |
baf76283 | 775 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
776 | if (r < 0) { |
777 | source_free(s); | |
778 | return -errno; | |
779 | } | |
780 | ||
a71fe8b8 LP |
781 | if (ret) |
782 | *ret = s; | |
783 | ||
fd38203a LP |
784 | return 0; |
785 | } | |
786 | ||
52444dc4 LP |
787 | static void initialize_perturb(sd_event *e) { |
788 | sd_id128_t bootid = {}; | |
789 | ||
790 | /* When we sleep for longer, we try to realign the wakeup to | |
791 | the same time wihtin each minute/second/250ms, so that | |
792 | events all across the system can be coalesced into a single | |
793 | CPU wakeup. However, let's take some system-specific | |
794 | randomness for this value, so that in a network of systems | |
795 | with synced clocks timer events are distributed a | |
796 | bit. Here, we calculate a perturbation usec offset from the | |
797 | boot ID. */ | |
798 | ||
799 | if (_likely_(e->perturb != (usec_t) -1)) | |
800 | return; | |
801 | ||
802 | if (sd_id128_get_boot(&bootid) >= 0) | |
803 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
804 | } | |
805 | ||
fd38203a LP |
806 | static int event_setup_timer_fd( |
807 | sd_event *e, | |
6a0f1f6d LP |
808 | struct clock_data *d, |
809 | clockid_t clock) { | |
fd38203a LP |
810 | |
811 | struct epoll_event ev = {}; | |
812 | int r, fd; | |
813 | ||
814 | assert(e); | |
6a0f1f6d | 815 | assert(d); |
fd38203a | 816 | |
6a0f1f6d | 817 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
818 | return 0; |
819 | ||
6a0f1f6d | 820 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
821 | if (fd < 0) |
822 | return -errno; | |
823 | ||
824 | ev.events = EPOLLIN; | |
6a0f1f6d | 825 | ev.data.ptr = INT_TO_PTR(clock_to_event_source_type(clock)); |
fd38203a LP |
826 | |
827 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
828 | if (r < 0) { | |
03e334a1 | 829 | safe_close(fd); |
fd38203a LP |
830 | return -errno; |
831 | } | |
832 | ||
6a0f1f6d | 833 | d->fd = fd; |
fd38203a LP |
834 | return 0; |
835 | } | |
836 | ||
6a0f1f6d | 837 | _public_ int sd_event_add_time( |
fd38203a | 838 | sd_event *e, |
151b9b96 | 839 | sd_event_source **ret, |
6a0f1f6d | 840 | clockid_t clock, |
fd38203a | 841 | uint64_t usec, |
c2ba3ad6 | 842 | uint64_t accuracy, |
718db961 | 843 | sd_event_time_handler_t callback, |
151b9b96 | 844 | void *userdata) { |
fd38203a | 845 | |
6a0f1f6d | 846 | EventSourceType type; |
fd38203a | 847 | sd_event_source *s; |
6a0f1f6d | 848 | struct clock_data *d; |
fd38203a LP |
849 | int r; |
850 | ||
305f78bf | 851 | assert_return(e, -EINVAL); |
305f78bf LP |
852 | assert_return(usec != (uint64_t) -1, -EINVAL); |
853 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 854 | assert_return(callback, -EINVAL); |
da7e457c | 855 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 856 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 857 | |
6a0f1f6d LP |
858 | type = clock_to_event_source_type(clock); |
859 | assert_return(type >= 0, -ENOTSUP); | |
860 | ||
861 | d = event_get_clock_data(e, type); | |
862 | assert(d); | |
c2ba3ad6 | 863 | |
6a0f1f6d LP |
864 | if (!d->earliest) { |
865 | d->earliest = prioq_new(earliest_time_prioq_compare); | |
866 | if (!d->earliest) | |
c2ba3ad6 LP |
867 | return -ENOMEM; |
868 | } | |
fd38203a | 869 | |
6a0f1f6d LP |
870 | if (!d->latest) { |
871 | d->latest = prioq_new(latest_time_prioq_compare); | |
872 | if (!d->latest) | |
fd38203a LP |
873 | return -ENOMEM; |
874 | } | |
875 | ||
6a0f1f6d LP |
876 | if (d->fd < 0) { |
877 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
878 | if (r < 0) |
879 | return r; | |
880 | } | |
881 | ||
a71fe8b8 | 882 | s = source_new(e, !ret, type); |
fd38203a LP |
883 | if (!s) |
884 | return -ENOMEM; | |
885 | ||
886 | s->time.next = usec; | |
c2ba3ad6 | 887 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 888 | s->time.callback = callback; |
da7e457c | 889 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 890 | s->userdata = userdata; |
baf76283 | 891 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 892 | |
6a0f1f6d | 893 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
894 | if (r < 0) |
895 | goto fail; | |
896 | ||
6a0f1f6d | 897 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
898 | if (r < 0) |
899 | goto fail; | |
fd38203a | 900 | |
a71fe8b8 LP |
901 | if (ret) |
902 | *ret = s; | |
903 | ||
fd38203a | 904 | return 0; |
c2ba3ad6 LP |
905 | |
906 | fail: | |
907 | source_free(s); | |
908 | return r; | |
fd38203a LP |
909 | } |
910 | ||
fd38203a LP |
911 | static int event_update_signal_fd(sd_event *e) { |
912 | struct epoll_event ev = {}; | |
913 | bool add_to_epoll; | |
914 | int r; | |
915 | ||
916 | assert(e); | |
917 | ||
918 | add_to_epoll = e->signal_fd < 0; | |
919 | ||
920 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
921 | if (r < 0) | |
922 | return -errno; | |
923 | ||
924 | e->signal_fd = r; | |
925 | ||
926 | if (!add_to_epoll) | |
927 | return 0; | |
928 | ||
929 | ev.events = EPOLLIN; | |
930 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
931 | ||
932 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
933 | if (r < 0) { | |
03e334a1 | 934 | e->signal_fd = safe_close(e->signal_fd); |
fd38203a LP |
935 | return -errno; |
936 | } | |
937 | ||
938 | return 0; | |
939 | } | |
940 | ||
59bc1fd7 LP |
941 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
942 | assert(s); | |
943 | ||
944 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
945 | } | |
946 | ||
f7262a9f | 947 | _public_ int sd_event_add_signal( |
305f78bf | 948 | sd_event *e, |
151b9b96 | 949 | sd_event_source **ret, |
305f78bf | 950 | int sig, |
718db961 | 951 | sd_event_signal_handler_t callback, |
151b9b96 | 952 | void *userdata) { |
305f78bf | 953 | |
fd38203a | 954 | sd_event_source *s; |
3022d74b | 955 | sigset_t ss; |
fd38203a LP |
956 | int r; |
957 | ||
305f78bf LP |
958 | assert_return(e, -EINVAL); |
959 | assert_return(sig > 0, -EINVAL); | |
960 | assert_return(sig < _NSIG, -EINVAL); | |
da7e457c | 961 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 962 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 963 | |
59bc1fd7 LP |
964 | if (!callback) |
965 | callback = signal_exit_callback; | |
966 | ||
3022d74b LP |
967 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
968 | if (r < 0) | |
969 | return -errno; | |
970 | ||
971 | if (!sigismember(&ss, sig)) | |
972 | return -EBUSY; | |
973 | ||
fd38203a LP |
974 | if (!e->signal_sources) { |
975 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
976 | if (!e->signal_sources) | |
977 | return -ENOMEM; | |
978 | } else if (e->signal_sources[sig]) | |
979 | return -EBUSY; | |
980 | ||
a71fe8b8 | 981 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
982 | if (!s) |
983 | return -ENOMEM; | |
984 | ||
985 | s->signal.sig = sig; | |
986 | s->signal.callback = callback; | |
987 | s->userdata = userdata; | |
baf76283 | 988 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
989 | |
990 | e->signal_sources[sig] = s; | |
991 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
992 | ||
baf76283 | 993 | if (sig != SIGCHLD || e->n_enabled_child_sources == 0) { |
fd38203a LP |
994 | r = event_update_signal_fd(e); |
995 | if (r < 0) { | |
996 | source_free(s); | |
997 | return r; | |
998 | } | |
999 | } | |
1000 | ||
a71fe8b8 LP |
1001 | if (ret) |
1002 | *ret = s; | |
1003 | ||
fd38203a LP |
1004 | return 0; |
1005 | } | |
1006 | ||
f7262a9f | 1007 | _public_ int sd_event_add_child( |
305f78bf | 1008 | sd_event *e, |
151b9b96 | 1009 | sd_event_source **ret, |
305f78bf LP |
1010 | pid_t pid, |
1011 | int options, | |
718db961 | 1012 | sd_event_child_handler_t callback, |
151b9b96 | 1013 | void *userdata) { |
305f78bf | 1014 | |
fd38203a LP |
1015 | sd_event_source *s; |
1016 | int r; | |
1017 | ||
305f78bf LP |
1018 | assert_return(e, -EINVAL); |
1019 | assert_return(pid > 1, -EINVAL); | |
1020 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1021 | assert_return(options != 0, -EINVAL); | |
1022 | assert_return(callback, -EINVAL); | |
da7e457c | 1023 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1024 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
1025 | |
1026 | r = hashmap_ensure_allocated(&e->child_sources, trivial_hash_func, trivial_compare_func); | |
1027 | if (r < 0) | |
1028 | return r; | |
1029 | ||
1030 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
1031 | return -EBUSY; | |
1032 | ||
a71fe8b8 | 1033 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1034 | if (!s) |
1035 | return -ENOMEM; | |
1036 | ||
1037 | s->child.pid = pid; | |
1038 | s->child.options = options; | |
1039 | s->child.callback = callback; | |
1040 | s->userdata = userdata; | |
baf76283 | 1041 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1042 | |
1043 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
1044 | if (r < 0) { | |
1045 | source_free(s); | |
1046 | return r; | |
1047 | } | |
1048 | ||
baf76283 | 1049 | e->n_enabled_child_sources ++; |
fd38203a LP |
1050 | |
1051 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
1052 | ||
1053 | if (!e->signal_sources || !e->signal_sources[SIGCHLD]) { | |
1054 | r = event_update_signal_fd(e); | |
1055 | if (r < 0) { | |
1056 | source_free(s); | |
1057 | return -errno; | |
1058 | } | |
1059 | } | |
1060 | ||
c2ba3ad6 LP |
1061 | e->need_process_child = true; |
1062 | ||
a71fe8b8 LP |
1063 | if (ret) |
1064 | *ret = s; | |
1065 | ||
fd38203a LP |
1066 | return 0; |
1067 | } | |
1068 | ||
f7262a9f | 1069 | _public_ int sd_event_add_defer( |
305f78bf | 1070 | sd_event *e, |
151b9b96 | 1071 | sd_event_source **ret, |
718db961 | 1072 | sd_event_handler_t callback, |
151b9b96 | 1073 | void *userdata) { |
305f78bf | 1074 | |
fd38203a LP |
1075 | sd_event_source *s; |
1076 | int r; | |
1077 | ||
305f78bf LP |
1078 | assert_return(e, -EINVAL); |
1079 | assert_return(callback, -EINVAL); | |
da7e457c | 1080 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1081 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1082 | |
a71fe8b8 | 1083 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1084 | if (!s) |
1085 | return -ENOMEM; | |
1086 | ||
1087 | s->defer.callback = callback; | |
1088 | s->userdata = userdata; | |
baf76283 | 1089 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1090 | |
1091 | r = source_set_pending(s, true); | |
1092 | if (r < 0) { | |
1093 | source_free(s); | |
1094 | return r; | |
1095 | } | |
1096 | ||
a71fe8b8 LP |
1097 | if (ret) |
1098 | *ret = s; | |
1099 | ||
fd38203a LP |
1100 | return 0; |
1101 | } | |
1102 | ||
6e9feda3 LP |
1103 | _public_ int sd_event_add_post( |
1104 | sd_event *e, | |
1105 | sd_event_source **ret, | |
1106 | sd_event_handler_t callback, | |
1107 | void *userdata) { | |
1108 | ||
1109 | sd_event_source *s; | |
1110 | int r; | |
1111 | ||
1112 | assert_return(e, -EINVAL); | |
1113 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1114 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1115 | assert_return(!event_pid_changed(e), -ECHILD); | |
1116 | ||
1117 | r = set_ensure_allocated(&e->post_sources, trivial_hash_func, trivial_compare_func); | |
1118 | if (r < 0) | |
1119 | return r; | |
1120 | ||
a71fe8b8 | 1121 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1122 | if (!s) |
1123 | return -ENOMEM; | |
1124 | ||
1125 | s->post.callback = callback; | |
1126 | s->userdata = userdata; | |
1127 | s->enabled = SD_EVENT_ON; | |
1128 | ||
1129 | r = set_put(e->post_sources, s); | |
1130 | if (r < 0) { | |
1131 | source_free(s); | |
1132 | return r; | |
1133 | } | |
1134 | ||
a71fe8b8 LP |
1135 | if (ret) |
1136 | *ret = s; | |
1137 | ||
6e9feda3 LP |
1138 | return 0; |
1139 | } | |
1140 | ||
6203e07a | 1141 | _public_ int sd_event_add_exit( |
305f78bf | 1142 | sd_event *e, |
151b9b96 | 1143 | sd_event_source **ret, |
718db961 | 1144 | sd_event_handler_t callback, |
151b9b96 | 1145 | void *userdata) { |
305f78bf | 1146 | |
da7e457c LP |
1147 | sd_event_source *s; |
1148 | int r; | |
1149 | ||
1150 | assert_return(e, -EINVAL); | |
1151 | assert_return(callback, -EINVAL); | |
1152 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1153 | assert_return(!event_pid_changed(e), -ECHILD); | |
1154 | ||
6203e07a LP |
1155 | if (!e->exit) { |
1156 | e->exit = prioq_new(exit_prioq_compare); | |
1157 | if (!e->exit) | |
da7e457c LP |
1158 | return -ENOMEM; |
1159 | } | |
1160 | ||
a71fe8b8 | 1161 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1162 | if (!s) |
da7e457c | 1163 | return -ENOMEM; |
fd38203a | 1164 | |
6203e07a | 1165 | s->exit.callback = callback; |
da7e457c | 1166 | s->userdata = userdata; |
6203e07a | 1167 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1168 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1169 | |
6203e07a | 1170 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1171 | if (r < 0) { |
1172 | source_free(s); | |
1173 | return r; | |
1174 | } | |
1175 | ||
a71fe8b8 LP |
1176 | if (ret) |
1177 | *ret = s; | |
1178 | ||
da7e457c LP |
1179 | return 0; |
1180 | } | |
1181 | ||
f7262a9f | 1182 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
da7e457c LP |
1183 | assert_return(s, NULL); |
1184 | ||
1185 | assert(s->n_ref >= 1); | |
1186 | s->n_ref++; | |
fd38203a LP |
1187 | |
1188 | return s; | |
1189 | } | |
1190 | ||
f7262a9f | 1191 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1192 | |
1193 | if (!s) | |
1194 | return NULL; | |
fd38203a | 1195 | |
da7e457c LP |
1196 | assert(s->n_ref >= 1); |
1197 | s->n_ref--; | |
1198 | ||
12179984 LP |
1199 | if (s->n_ref <= 0) { |
1200 | /* Here's a special hack: when we are called from a | |
1201 | * dispatch handler we won't free the event source | |
1202 | * immediately, but we will detach the fd from the | |
1203 | * epoll. This way it is safe for the caller to unref | |
1204 | * the event source and immediately close the fd, but | |
1205 | * we still retain a valid event source object after | |
1206 | * the callback. */ | |
1207 | ||
1208 | if (s->dispatching) { | |
1209 | if (s->type == SOURCE_IO) | |
1210 | source_io_unregister(s); | |
a71fe8b8 LP |
1211 | |
1212 | source_disconnect(s); | |
12179984 LP |
1213 | } else |
1214 | source_free(s); | |
1215 | } | |
fd38203a LP |
1216 | |
1217 | return NULL; | |
1218 | } | |
1219 | ||
adcc4ca3 | 1220 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1221 | assert_return(s, NULL); |
eaa3cbef LP |
1222 | |
1223 | return s->event; | |
1224 | } | |
1225 | ||
f7262a9f | 1226 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1227 | assert_return(s, -EINVAL); |
6203e07a | 1228 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1229 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1230 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1231 | |
1232 | return s->pending; | |
1233 | } | |
1234 | ||
f7262a9f | 1235 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1236 | assert_return(s, -EINVAL); |
1237 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1238 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1239 | |
1240 | return s->io.fd; | |
1241 | } | |
1242 | ||
30caf8f3 LP |
1243 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1244 | int r; | |
1245 | ||
1246 | assert_return(s, -EINVAL); | |
1247 | assert_return(fd >= 0, -EINVAL); | |
1248 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1249 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1250 | ||
1251 | if (s->io.fd == fd) | |
1252 | return 0; | |
1253 | ||
1254 | if (s->enabled == SD_EVENT_OFF) { | |
1255 | s->io.fd = fd; | |
1256 | s->io.registered = false; | |
1257 | } else { | |
1258 | int saved_fd; | |
1259 | ||
1260 | saved_fd = s->io.fd; | |
1261 | assert(s->io.registered); | |
1262 | ||
1263 | s->io.fd = fd; | |
1264 | s->io.registered = false; | |
1265 | ||
1266 | r = source_io_register(s, s->enabled, s->io.events); | |
1267 | if (r < 0) { | |
1268 | s->io.fd = saved_fd; | |
1269 | s->io.registered = true; | |
1270 | return r; | |
1271 | } | |
1272 | ||
1273 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1274 | } | |
1275 | ||
1276 | return 0; | |
1277 | } | |
1278 | ||
f7262a9f | 1279 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1280 | assert_return(s, -EINVAL); |
1281 | assert_return(events, -EINVAL); | |
1282 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1283 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1284 | |
1285 | *events = s->io.events; | |
1286 | return 0; | |
1287 | } | |
1288 | ||
f7262a9f | 1289 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1290 | int r; |
1291 | ||
305f78bf LP |
1292 | assert_return(s, -EINVAL); |
1293 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1294 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1295 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1296 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1297 | |
b63c8d4f DH |
1298 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1299 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1300 | return 0; |
1301 | ||
baf76283 | 1302 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1303 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1304 | if (r < 0) |
1305 | return r; | |
1306 | } | |
1307 | ||
1308 | s->io.events = events; | |
503f39c3 | 1309 | source_set_pending(s, false); |
fd38203a LP |
1310 | |
1311 | return 0; | |
1312 | } | |
1313 | ||
f7262a9f | 1314 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1315 | assert_return(s, -EINVAL); |
1316 | assert_return(revents, -EINVAL); | |
1317 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1318 | assert_return(s->pending, -ENODATA); | |
1319 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1320 | |
1321 | *revents = s->io.revents; | |
1322 | return 0; | |
1323 | } | |
1324 | ||
f7262a9f | 1325 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1326 | assert_return(s, -EINVAL); |
1327 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1328 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1329 | |
1330 | return s->signal.sig; | |
1331 | } | |
1332 | ||
31927c16 | 1333 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1334 | assert_return(s, -EINVAL); |
1335 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1336 | |
1337 | return s->priority; | |
1338 | } | |
1339 | ||
31927c16 | 1340 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
305f78bf | 1341 | assert_return(s, -EINVAL); |
da7e457c | 1342 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1343 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1344 | |
1345 | if (s->priority == priority) | |
1346 | return 0; | |
1347 | ||
1348 | s->priority = priority; | |
1349 | ||
1350 | if (s->pending) | |
c2ba3ad6 | 1351 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1352 | |
1353 | if (s->prepare) | |
c2ba3ad6 | 1354 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1355 | |
6203e07a LP |
1356 | if (s->type == SOURCE_EXIT) |
1357 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1358 | |
fd38203a LP |
1359 | return 0; |
1360 | } | |
1361 | ||
f7262a9f | 1362 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1363 | assert_return(s, -EINVAL); |
1364 | assert_return(m, -EINVAL); | |
1365 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1366 | |
baf76283 | 1367 | *m = s->enabled; |
fd38203a LP |
1368 | return 0; |
1369 | } | |
1370 | ||
f7262a9f | 1371 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1372 | int r; |
1373 | ||
305f78bf LP |
1374 | assert_return(s, -EINVAL); |
1375 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
305f78bf | 1376 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1377 | |
cc567911 LP |
1378 | /* If we are dead anyway, we are fine with turning off |
1379 | * sources, but everything else needs to fail. */ | |
1380 | if (s->event->state == SD_EVENT_FINISHED) | |
1381 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1382 | ||
baf76283 | 1383 | if (s->enabled == m) |
fd38203a LP |
1384 | return 0; |
1385 | ||
baf76283 | 1386 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1387 | |
1388 | switch (s->type) { | |
1389 | ||
1390 | case SOURCE_IO: | |
1391 | r = source_io_unregister(s); | |
1392 | if (r < 0) | |
1393 | return r; | |
1394 | ||
baf76283 | 1395 | s->enabled = m; |
fd38203a LP |
1396 | break; |
1397 | ||
6a0f1f6d | 1398 | case SOURCE_TIME_REALTIME: |
a8548816 | 1399 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1400 | case SOURCE_TIME_MONOTONIC: |
1401 | case SOURCE_TIME_REALTIME_ALARM: | |
1402 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1403 | struct clock_data *d; | |
fd38203a | 1404 | |
baf76283 | 1405 | s->enabled = m; |
6a0f1f6d LP |
1406 | d = event_get_clock_data(s->event, s->type); |
1407 | assert(d); | |
1408 | ||
1409 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1410 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a | 1411 | break; |
6a0f1f6d | 1412 | } |
fd38203a LP |
1413 | |
1414 | case SOURCE_SIGNAL: | |
baf76283 LP |
1415 | s->enabled = m; |
1416 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { | |
fd38203a LP |
1417 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
1418 | event_update_signal_fd(s->event); | |
1419 | } | |
1420 | ||
1421 | break; | |
1422 | ||
1423 | case SOURCE_CHILD: | |
baf76283 | 1424 | s->enabled = m; |
fd38203a | 1425 | |
baf76283 LP |
1426 | assert(s->event->n_enabled_child_sources > 0); |
1427 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
1428 | |
1429 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1430 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
1431 | event_update_signal_fd(s->event); | |
1432 | } | |
1433 | ||
1434 | break; | |
1435 | ||
6203e07a | 1436 | case SOURCE_EXIT: |
305f78bf | 1437 | s->enabled = m; |
6203e07a | 1438 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1439 | break; |
1440 | ||
1441 | case SOURCE_DEFER: | |
6e9feda3 | 1442 | case SOURCE_POST: |
baf76283 | 1443 | s->enabled = m; |
fd38203a | 1444 | break; |
9d3e3aa5 | 1445 | |
6a0f1f6d | 1446 | default: |
9d3e3aa5 | 1447 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1448 | } |
1449 | ||
1450 | } else { | |
1451 | switch (s->type) { | |
1452 | ||
1453 | case SOURCE_IO: | |
1454 | r = source_io_register(s, m, s->io.events); | |
1455 | if (r < 0) | |
1456 | return r; | |
1457 | ||
baf76283 | 1458 | s->enabled = m; |
fd38203a LP |
1459 | break; |
1460 | ||
6a0f1f6d | 1461 | case SOURCE_TIME_REALTIME: |
a8548816 | 1462 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1463 | case SOURCE_TIME_MONOTONIC: |
1464 | case SOURCE_TIME_REALTIME_ALARM: | |
1465 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1466 | struct clock_data *d; | |
fd38203a | 1467 | |
baf76283 | 1468 | s->enabled = m; |
6a0f1f6d LP |
1469 | d = event_get_clock_data(s->event, s->type); |
1470 | assert(d); | |
1471 | ||
1472 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1473 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a | 1474 | break; |
6a0f1f6d | 1475 | } |
fd38203a LP |
1476 | |
1477 | case SOURCE_SIGNAL: | |
baf76283 | 1478 | s->enabled = m; |
fd38203a | 1479 | |
baf76283 | 1480 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { |
fd38203a LP |
1481 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
1482 | event_update_signal_fd(s->event); | |
1483 | } | |
1484 | break; | |
1485 | ||
1486 | case SOURCE_CHILD: | |
baf76283 LP |
1487 | if (s->enabled == SD_EVENT_OFF) { |
1488 | s->event->n_enabled_child_sources++; | |
fd38203a LP |
1489 | |
1490 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1491 | assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0); | |
1492 | event_update_signal_fd(s->event); | |
1493 | } | |
1494 | } | |
7a0d4a3d DH |
1495 | |
1496 | s->enabled = m; | |
fd38203a LP |
1497 | break; |
1498 | ||
6203e07a | 1499 | case SOURCE_EXIT: |
305f78bf | 1500 | s->enabled = m; |
6203e07a | 1501 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1502 | break; |
1503 | ||
1504 | case SOURCE_DEFER: | |
6e9feda3 | 1505 | case SOURCE_POST: |
baf76283 | 1506 | s->enabled = m; |
fd38203a | 1507 | break; |
9d3e3aa5 | 1508 | |
6a0f1f6d | 1509 | default: |
9d3e3aa5 | 1510 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1511 | } |
1512 | } | |
1513 | ||
1514 | if (s->pending) | |
1515 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1516 | ||
1517 | if (s->prepare) | |
1518 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1519 | ||
1520 | return 0; | |
1521 | } | |
1522 | ||
f7262a9f | 1523 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1524 | assert_return(s, -EINVAL); |
1525 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1526 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1527 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1528 | |
1529 | *usec = s->time.next; | |
1530 | return 0; | |
1531 | } | |
1532 | ||
f7262a9f | 1533 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1534 | struct clock_data *d; |
1535 | ||
305f78bf LP |
1536 | assert_return(s, -EINVAL); |
1537 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1538 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1539 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1540 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1541 | |
fd38203a | 1542 | s->time.next = usec; |
2576a19e | 1543 | |
0cc1125a | 1544 | source_set_pending(s, false); |
fd38203a | 1545 | |
6a0f1f6d LP |
1546 | d = event_get_clock_data(s->event, s->type); |
1547 | assert(d); | |
1548 | ||
1549 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1550 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a LP |
1551 | |
1552 | return 0; | |
1553 | } | |
1554 | ||
f7262a9f | 1555 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1556 | assert_return(s, -EINVAL); |
1557 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1558 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1559 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1560 | ||
1561 | *usec = s->time.accuracy; | |
1562 | return 0; | |
1563 | } | |
1564 | ||
f7262a9f | 1565 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1566 | struct clock_data *d; |
1567 | ||
305f78bf LP |
1568 | assert_return(s, -EINVAL); |
1569 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1570 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1571 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1572 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1573 | |
1574 | if (usec == 0) | |
1575 | usec = DEFAULT_ACCURACY_USEC; | |
1576 | ||
eaa3cbef LP |
1577 | s->time.accuracy = usec; |
1578 | ||
2576a19e LP |
1579 | source_set_pending(s, false); |
1580 | ||
6a0f1f6d LP |
1581 | d = event_get_clock_data(s->event, s->type); |
1582 | assert(d); | |
1583 | ||
1584 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
1585 | ||
1586 | return 0; | |
1587 | } | |
1588 | ||
1589 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1590 | assert_return(s, -EINVAL); | |
1591 | assert_return(clock, -EINVAL); | |
1592 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1593 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1594 | |
6a0f1f6d | 1595 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1596 | return 0; |
1597 | } | |
1598 | ||
f7262a9f | 1599 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1600 | assert_return(s, -EINVAL); |
1601 | assert_return(pid, -EINVAL); | |
1602 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1603 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1604 | ||
1605 | *pid = s->child.pid; | |
1606 | return 0; | |
1607 | } | |
1608 | ||
718db961 | 1609 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1610 | int r; |
1611 | ||
da7e457c | 1612 | assert_return(s, -EINVAL); |
6203e07a | 1613 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1614 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1615 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1616 | |
1617 | if (s->prepare == callback) | |
1618 | return 0; | |
1619 | ||
1620 | if (callback && s->prepare) { | |
1621 | s->prepare = callback; | |
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1626 | if (r < 0) | |
1627 | return r; | |
1628 | ||
1629 | s->prepare = callback; | |
1630 | ||
1631 | if (callback) { | |
1632 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1633 | if (r < 0) | |
1634 | return r; | |
1635 | } else | |
1636 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1637 | ||
1638 | return 0; | |
1639 | } | |
1640 | ||
f7262a9f | 1641 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1642 | assert_return(s, NULL); |
fd38203a LP |
1643 | |
1644 | return s->userdata; | |
1645 | } | |
1646 | ||
8f726607 LP |
1647 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1648 | void *ret; | |
1649 | ||
1650 | assert_return(s, NULL); | |
1651 | ||
1652 | ret = s->userdata; | |
1653 | s->userdata = userdata; | |
1654 | ||
1655 | return ret; | |
1656 | } | |
1657 | ||
c2ba3ad6 LP |
1658 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1659 | usec_t c; | |
1660 | assert(e); | |
1661 | assert(a <= b); | |
1662 | ||
1663 | if (a <= 0) | |
1664 | return 0; | |
1665 | ||
1666 | if (b <= a + 1) | |
1667 | return a; | |
1668 | ||
52444dc4 LP |
1669 | initialize_perturb(e); |
1670 | ||
c2ba3ad6 LP |
1671 | /* |
1672 | Find a good time to wake up again between times a and b. We | |
1673 | have two goals here: | |
1674 | ||
1675 | a) We want to wake up as seldom as possible, hence prefer | |
1676 | later times over earlier times. | |
1677 | ||
1678 | b) But if we have to wake up, then let's make sure to | |
1679 | dispatch as much as possible on the entire system. | |
1680 | ||
1681 | We implement this by waking up everywhere at the same time | |
850516e0 | 1682 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1683 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1684 | then we try to find the same spot in every 10s, then 1s and |
1685 | then 250ms step. Otherwise, we pick the last possible time | |
1686 | to wake up. | |
c2ba3ad6 LP |
1687 | */ |
1688 | ||
850516e0 LP |
1689 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1690 | if (c >= b) { | |
1691 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1692 | return b; | |
1693 | ||
1694 | c -= USEC_PER_MINUTE; | |
1695 | } | |
1696 | ||
ba276c81 LP |
1697 | if (c >= a) |
1698 | return c; | |
1699 | ||
1700 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1701 | if (c >= b) { | |
1702 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1703 | return b; | |
1704 | ||
1705 | c -= USEC_PER_SEC*10; | |
1706 | } | |
1707 | ||
850516e0 LP |
1708 | if (c >= a) |
1709 | return c; | |
1710 | ||
1711 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1712 | if (c >= b) { |
1713 | if (_unlikely_(c < USEC_PER_SEC)) | |
1714 | return b; | |
1715 | ||
1716 | c -= USEC_PER_SEC; | |
1717 | } | |
1718 | ||
1719 | if (c >= a) | |
1720 | return c; | |
1721 | ||
1722 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1723 | if (c >= b) { | |
1724 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1725 | return b; | |
1726 | ||
1727 | c -= USEC_PER_MSEC*250; | |
1728 | } | |
1729 | ||
1730 | if (c >= a) | |
1731 | return c; | |
1732 | ||
1733 | return b; | |
1734 | } | |
1735 | ||
fd38203a LP |
1736 | static int event_arm_timer( |
1737 | sd_event *e, | |
6a0f1f6d | 1738 | struct clock_data *d) { |
fd38203a LP |
1739 | |
1740 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1741 | sd_event_source *a, *b; |
1742 | usec_t t; | |
fd38203a LP |
1743 | int r; |
1744 | ||
cde93897 | 1745 | assert(e); |
6a0f1f6d | 1746 | assert(d); |
fd38203a | 1747 | |
6a0f1f6d | 1748 | a = prioq_peek(d->earliest); |
72aedc1e LP |
1749 | if (!a || a->enabled == SD_EVENT_OFF) { |
1750 | ||
6a0f1f6d | 1751 | if (d->fd < 0) |
c57b5ca3 LP |
1752 | return 0; |
1753 | ||
6a0f1f6d | 1754 | if (d->next == (usec_t) -1) |
72aedc1e LP |
1755 | return 0; |
1756 | ||
1757 | /* disarm */ | |
6a0f1f6d | 1758 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1759 | if (r < 0) |
1760 | return r; | |
1761 | ||
6a0f1f6d | 1762 | d->next = (usec_t) -1; |
fd38203a | 1763 | return 0; |
72aedc1e | 1764 | } |
fd38203a | 1765 | |
6a0f1f6d | 1766 | b = prioq_peek(d->latest); |
baf76283 | 1767 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1768 | |
1769 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
6a0f1f6d | 1770 | if (d->next == t) |
fd38203a LP |
1771 | return 0; |
1772 | ||
6a0f1f6d | 1773 | assert_se(d->fd >= 0); |
fd38203a | 1774 | |
c2ba3ad6 | 1775 | if (t == 0) { |
fd38203a LP |
1776 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1777 | its.it_value.tv_sec = 0; | |
1778 | its.it_value.tv_nsec = 1; | |
1779 | } else | |
c2ba3ad6 | 1780 | timespec_store(&its.it_value, t); |
fd38203a | 1781 | |
6a0f1f6d | 1782 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 1783 | if (r < 0) |
cde93897 | 1784 | return -errno; |
fd38203a | 1785 | |
6a0f1f6d | 1786 | d->next = t; |
fd38203a LP |
1787 | return 0; |
1788 | } | |
1789 | ||
9a800b56 | 1790 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
1791 | assert(e); |
1792 | assert(s); | |
1793 | assert(s->type == SOURCE_IO); | |
1794 | ||
9a800b56 LP |
1795 | /* If the event source was already pending, we just OR in the |
1796 | * new revents, otherwise we reset the value. The ORing is | |
1797 | * necessary to handle EPOLLONESHOT events properly where | |
1798 | * readability might happen independently of writability, and | |
1799 | * we need to keep track of both */ | |
1800 | ||
1801 | if (s->pending) | |
1802 | s->io.revents |= revents; | |
1803 | else | |
1804 | s->io.revents = revents; | |
fd38203a | 1805 | |
fd38203a LP |
1806 | return source_set_pending(s, true); |
1807 | } | |
1808 | ||
72aedc1e | 1809 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
1810 | uint64_t x; |
1811 | ssize_t ss; | |
1812 | ||
1813 | assert(e); | |
da7e457c | 1814 | assert(fd >= 0); |
72aedc1e | 1815 | |
305f78bf | 1816 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1817 | |
1818 | ss = read(fd, &x, sizeof(x)); | |
1819 | if (ss < 0) { | |
1820 | if (errno == EAGAIN || errno == EINTR) | |
1821 | return 0; | |
1822 | ||
1823 | return -errno; | |
1824 | } | |
1825 | ||
8d35dae7 | 1826 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
1827 | return -EIO; |
1828 | ||
cde93897 LP |
1829 | if (next) |
1830 | *next = (usec_t) -1; | |
72aedc1e | 1831 | |
fd38203a LP |
1832 | return 0; |
1833 | } | |
1834 | ||
305f78bf LP |
1835 | static int process_timer( |
1836 | sd_event *e, | |
1837 | usec_t n, | |
6a0f1f6d | 1838 | struct clock_data *d) { |
305f78bf | 1839 | |
fd38203a LP |
1840 | sd_event_source *s; |
1841 | int r; | |
1842 | ||
1843 | assert(e); | |
6a0f1f6d | 1844 | assert(d); |
fd38203a LP |
1845 | |
1846 | for (;;) { | |
6a0f1f6d | 1847 | s = prioq_peek(d->earliest); |
fd38203a LP |
1848 | if (!s || |
1849 | s->time.next > n || | |
baf76283 | 1850 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1851 | s->pending) |
1852 | break; | |
1853 | ||
1854 | r = source_set_pending(s, true); | |
1855 | if (r < 0) | |
1856 | return r; | |
1857 | ||
6a0f1f6d LP |
1858 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
1859 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a LP |
1860 | } |
1861 | ||
1862 | return 0; | |
1863 | } | |
1864 | ||
1865 | static int process_child(sd_event *e) { | |
1866 | sd_event_source *s; | |
1867 | Iterator i; | |
1868 | int r; | |
1869 | ||
1870 | assert(e); | |
1871 | ||
c2ba3ad6 LP |
1872 | e->need_process_child = false; |
1873 | ||
fd38203a LP |
1874 | /* |
1875 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1876 | + WNOHANG for each PID we wait for, instead of using | |
1877 | P_ALL. This is because we only want to get child | |
1878 | information of very specific child processes, and not all | |
1879 | of them. We might not have processed the SIGCHLD even of a | |
1880 | previous invocation and we don't want to maintain a | |
1881 | unbounded *per-child* event queue, hence we really don't | |
1882 | want anything flushed out of the kernel's queue that we | |
1883 | don't care about. Since this is O(n) this means that if you | |
1884 | have a lot of processes you probably want to handle SIGCHLD | |
1885 | yourself. | |
08cd1552 LP |
1886 | |
1887 | We do not reap the children here (by using WNOWAIT), this | |
1888 | is only done after the event source is dispatched so that | |
1889 | the callback still sees the process as a zombie. | |
fd38203a LP |
1890 | */ |
1891 | ||
1892 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1893 | assert(s->type == SOURCE_CHILD); | |
1894 | ||
1895 | if (s->pending) | |
1896 | continue; | |
1897 | ||
baf76283 | 1898 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1899 | continue; |
1900 | ||
1901 | zero(s->child.siginfo); | |
08cd1552 LP |
1902 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
1903 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
1904 | if (r < 0) |
1905 | return -errno; | |
1906 | ||
1907 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
1908 | bool zombie = |
1909 | s->child.siginfo.si_code == CLD_EXITED || | |
1910 | s->child.siginfo.si_code == CLD_KILLED || | |
1911 | s->child.siginfo.si_code == CLD_DUMPED; | |
1912 | ||
1913 | if (!zombie && (s->child.options & WEXITED)) { | |
1914 | /* If the child isn't dead then let's | |
1915 | * immediately remove the state change | |
1916 | * from the queue, since there's no | |
1917 | * benefit in leaving it queued */ | |
1918 | ||
1919 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
1920 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
1921 | } | |
1922 | ||
fd38203a LP |
1923 | r = source_set_pending(s, true); |
1924 | if (r < 0) | |
1925 | return r; | |
1926 | } | |
1927 | } | |
1928 | ||
fd38203a LP |
1929 | return 0; |
1930 | } | |
1931 | ||
1932 | static int process_signal(sd_event *e, uint32_t events) { | |
fd38203a | 1933 | bool read_one = false; |
fd38203a LP |
1934 | int r; |
1935 | ||
da7e457c | 1936 | assert(e); |
0eb2e0e3 | 1937 | |
305f78bf | 1938 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1939 | |
1940 | for (;;) { | |
0eb2e0e3 ZJS |
1941 | struct signalfd_siginfo si; |
1942 | ssize_t ss; | |
92daebc0 | 1943 | sd_event_source *s = NULL; |
fd38203a LP |
1944 | |
1945 | ss = read(e->signal_fd, &si, sizeof(si)); | |
1946 | if (ss < 0) { | |
1947 | if (errno == EAGAIN || errno == EINTR) | |
1948 | return read_one; | |
1949 | ||
1950 | return -errno; | |
1951 | } | |
1952 | ||
8d35dae7 | 1953 | if (_unlikely_(ss != sizeof(si))) |
fd38203a LP |
1954 | return -EIO; |
1955 | ||
1956 | read_one = true; | |
1957 | ||
1958 | if (si.ssi_signo == SIGCHLD) { | |
1959 | r = process_child(e); | |
1960 | if (r < 0) | |
1961 | return r; | |
92daebc0 | 1962 | if (r > 0) |
fd38203a | 1963 | continue; |
92daebc0 LP |
1964 | } |
1965 | ||
1966 | if (e->signal_sources) | |
1967 | s = e->signal_sources[si.ssi_signo]; | |
1968 | ||
1969 | if (!s) | |
1970 | continue; | |
fd38203a LP |
1971 | |
1972 | s->signal.siginfo = si; | |
1973 | r = source_set_pending(s, true); | |
1974 | if (r < 0) | |
1975 | return r; | |
1976 | } | |
fd38203a LP |
1977 | } |
1978 | ||
1979 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 1980 | int r = 0; |
fd38203a LP |
1981 | |
1982 | assert(s); | |
6203e07a | 1983 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 1984 | |
6203e07a | 1985 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
1986 | r = source_set_pending(s, false); |
1987 | if (r < 0) | |
1988 | return r; | |
1989 | } | |
fd38203a | 1990 | |
6e9feda3 LP |
1991 | if (s->type != SOURCE_POST) { |
1992 | sd_event_source *z; | |
1993 | Iterator i; | |
1994 | ||
1995 | /* If we execute a non-post source, let's mark all | |
1996 | * post sources as pending */ | |
1997 | ||
1998 | SET_FOREACH(z, s->event->post_sources, i) { | |
1999 | if (z->enabled == SD_EVENT_OFF) | |
2000 | continue; | |
2001 | ||
2002 | r = source_set_pending(z, true); | |
2003 | if (r < 0) | |
2004 | return r; | |
2005 | } | |
2006 | } | |
2007 | ||
baf76283 LP |
2008 | if (s->enabled == SD_EVENT_ONESHOT) { |
2009 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2010 | if (r < 0) |
2011 | return r; | |
2012 | } | |
2013 | ||
12179984 | 2014 | s->dispatching = true; |
b7484e2a | 2015 | |
fd38203a LP |
2016 | switch (s->type) { |
2017 | ||
2018 | case SOURCE_IO: | |
2019 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2020 | break; | |
2021 | ||
6a0f1f6d | 2022 | case SOURCE_TIME_REALTIME: |
a8548816 | 2023 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2024 | case SOURCE_TIME_MONOTONIC: |
2025 | case SOURCE_TIME_REALTIME_ALARM: | |
2026 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2027 | r = s->time.callback(s, s->time.next, s->userdata); |
2028 | break; | |
2029 | ||
2030 | case SOURCE_SIGNAL: | |
2031 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2032 | break; | |
2033 | ||
08cd1552 LP |
2034 | case SOURCE_CHILD: { |
2035 | bool zombie; | |
2036 | ||
2037 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
2038 | s->child.siginfo.si_code == CLD_KILLED || | |
2039 | s->child.siginfo.si_code == CLD_DUMPED; | |
2040 | ||
fd38203a | 2041 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2042 | |
2043 | /* Now, reap the PID for good. */ | |
2044 | if (zombie) | |
2045 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2046 | ||
fd38203a | 2047 | break; |
08cd1552 | 2048 | } |
fd38203a LP |
2049 | |
2050 | case SOURCE_DEFER: | |
2051 | r = s->defer.callback(s, s->userdata); | |
2052 | break; | |
da7e457c | 2053 | |
6e9feda3 LP |
2054 | case SOURCE_POST: |
2055 | r = s->post.callback(s, s->userdata); | |
2056 | break; | |
2057 | ||
6203e07a LP |
2058 | case SOURCE_EXIT: |
2059 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2060 | break; |
9d3e3aa5 LP |
2061 | |
2062 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2063 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2064 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2065 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2066 | } |
2067 | ||
12179984 LP |
2068 | s->dispatching = false; |
2069 | ||
2070 | if (r < 0) | |
6203e07a | 2071 | log_debug("Event source %p returned error, disabling: %s", s, strerror(-r)); |
12179984 LP |
2072 | |
2073 | if (s->n_ref == 0) | |
2074 | source_free(s); | |
2075 | else if (r < 0) | |
6203e07a | 2076 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2077 | |
6203e07a | 2078 | return 1; |
fd38203a LP |
2079 | } |
2080 | ||
2081 | static int event_prepare(sd_event *e) { | |
2082 | int r; | |
2083 | ||
2084 | assert(e); | |
2085 | ||
2086 | for (;;) { | |
2087 | sd_event_source *s; | |
2088 | ||
2089 | s = prioq_peek(e->prepare); | |
baf76283 | 2090 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2091 | break; |
2092 | ||
2093 | s->prepare_iteration = e->iteration; | |
2094 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2095 | if (r < 0) | |
2096 | return r; | |
2097 | ||
2098 | assert(s->prepare); | |
12179984 LP |
2099 | |
2100 | s->dispatching = true; | |
fd38203a | 2101 | r = s->prepare(s, s->userdata); |
12179984 LP |
2102 | s->dispatching = false; |
2103 | ||
fd38203a | 2104 | if (r < 0) |
12179984 | 2105 | log_debug("Prepare callback of event source %p returned error, disabling: %s", s, strerror(-r)); |
fd38203a | 2106 | |
12179984 LP |
2107 | if (s->n_ref == 0) |
2108 | source_free(s); | |
2109 | else if (r < 0) | |
2110 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2111 | } |
2112 | ||
2113 | return 0; | |
2114 | } | |
2115 | ||
6203e07a | 2116 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2117 | sd_event_source *p; |
2118 | int r; | |
2119 | ||
2120 | assert(e); | |
2121 | ||
6203e07a | 2122 | p = prioq_peek(e->exit); |
baf76283 | 2123 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2124 | e->state = SD_EVENT_FINISHED; |
2125 | return 0; | |
2126 | } | |
2127 | ||
2128 | sd_event_ref(e); | |
2129 | e->iteration++; | |
6203e07a | 2130 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2131 | |
2132 | r = source_dispatch(p); | |
2133 | ||
2134 | e->state = SD_EVENT_PASSIVE; | |
2135 | sd_event_unref(e); | |
2136 | ||
2137 | return r; | |
2138 | } | |
2139 | ||
c2ba3ad6 LP |
2140 | static sd_event_source* event_next_pending(sd_event *e) { |
2141 | sd_event_source *p; | |
2142 | ||
da7e457c LP |
2143 | assert(e); |
2144 | ||
c2ba3ad6 LP |
2145 | p = prioq_peek(e->pending); |
2146 | if (!p) | |
2147 | return NULL; | |
2148 | ||
baf76283 | 2149 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2150 | return NULL; |
2151 | ||
2152 | return p; | |
2153 | } | |
2154 | ||
cde93897 LP |
2155 | static int arm_watchdog(sd_event *e) { |
2156 | struct itimerspec its = {}; | |
2157 | usec_t t; | |
2158 | int r; | |
2159 | ||
2160 | assert(e); | |
2161 | assert(e->watchdog_fd >= 0); | |
2162 | ||
2163 | t = sleep_between(e, | |
2164 | e->watchdog_last + (e->watchdog_period / 2), | |
2165 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2166 | ||
2167 | timespec_store(&its.it_value, t); | |
2168 | ||
75145780 LP |
2169 | /* Make sure we never set the watchdog to 0, which tells the |
2170 | * kernel to disable it. */ | |
2171 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2172 | its.it_value.tv_nsec = 1; | |
2173 | ||
cde93897 LP |
2174 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2175 | if (r < 0) | |
2176 | return -errno; | |
2177 | ||
2178 | return 0; | |
2179 | } | |
2180 | ||
2181 | static int process_watchdog(sd_event *e) { | |
2182 | assert(e); | |
2183 | ||
2184 | if (!e->watchdog) | |
2185 | return 0; | |
2186 | ||
2187 | /* Don't notify watchdog too often */ | |
2188 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2189 | return 0; | |
2190 | ||
2191 | sd_notify(false, "WATCHDOG=1"); | |
2192 | e->watchdog_last = e->timestamp.monotonic; | |
2193 | ||
2194 | return arm_watchdog(e); | |
2195 | } | |
2196 | ||
f7262a9f | 2197 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
15b38f93 LP |
2198 | struct epoll_event *ev_queue; |
2199 | unsigned ev_queue_max; | |
fd38203a | 2200 | sd_event_source *p; |
305f78bf | 2201 | int r, i, m; |
eec6022c | 2202 | bool timedout; |
fd38203a | 2203 | |
da7e457c LP |
2204 | assert_return(e, -EINVAL); |
2205 | assert_return(!event_pid_changed(e), -ECHILD); | |
2206 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2207 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2208 | ||
6203e07a LP |
2209 | if (e->exit_requested) |
2210 | return dispatch_exit(e); | |
fd38203a | 2211 | |
da7e457c | 2212 | sd_event_ref(e); |
fd38203a | 2213 | e->iteration++; |
da7e457c | 2214 | e->state = SD_EVENT_RUNNING; |
fd38203a LP |
2215 | |
2216 | r = event_prepare(e); | |
2217 | if (r < 0) | |
da7e457c | 2218 | goto finish; |
fd38203a | 2219 | |
6a0f1f6d LP |
2220 | r = event_arm_timer(e, &e->realtime); |
2221 | if (r < 0) | |
2222 | goto finish; | |
2223 | ||
a8548816 TG |
2224 | r = event_arm_timer(e, &e->boottime); |
2225 | if (r < 0) | |
2226 | goto finish; | |
2227 | ||
6a0f1f6d LP |
2228 | r = event_arm_timer(e, &e->monotonic); |
2229 | if (r < 0) | |
2230 | goto finish; | |
2231 | ||
2232 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 LP |
2233 | if (r < 0) |
2234 | goto finish; | |
fd38203a | 2235 | |
6a0f1f6d | 2236 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 LP |
2237 | if (r < 0) |
2238 | goto finish; | |
fd38203a | 2239 | |
1b5995b0 LP |
2240 | if (event_next_pending(e) || e->need_process_child) |
2241 | timeout = 0; | |
6a0f1f6d | 2242 | |
15b38f93 LP |
2243 | ev_queue_max = CLAMP(e->n_sources, 1U, EPOLL_QUEUE_MAX); |
2244 | ev_queue = newa(struct epoll_event, ev_queue_max); | |
fd38203a | 2245 | |
15b38f93 | 2246 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2247 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2248 | if (m < 0) { |
ff003106 | 2249 | r = errno == EAGAIN || errno == EINTR ? 1 : -errno; |
da7e457c LP |
2250 | goto finish; |
2251 | } | |
fd38203a | 2252 | |
eec6022c LP |
2253 | timedout = m == 0; |
2254 | ||
46e8c825 | 2255 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2256 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2257 | |
2258 | for (i = 0; i < m; i++) { | |
2259 | ||
6a0f1f6d LP |
2260 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME)) |
2261 | r = flush_timer(e, e->realtime.fd, ev_queue[i].events, &e->realtime.next); | |
a8548816 TG |
2262 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_BOOTTIME)) |
2263 | r = flush_timer(e, e->boottime.fd, ev_queue[i].events, &e->boottime.next); | |
6a0f1f6d LP |
2264 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_MONOTONIC)) |
2265 | r = flush_timer(e, e->monotonic.fd, ev_queue[i].events, &e->monotonic.next); | |
2266 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME_ALARM)) | |
2267 | r = flush_timer(e, e->realtime_alarm.fd, ev_queue[i].events, &e->realtime_alarm.next); | |
2268 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_BOOTTIME_ALARM)) | |
2269 | r = flush_timer(e, e->boottime_alarm.fd, ev_queue[i].events, &e->boottime_alarm.next); | |
fd38203a LP |
2270 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) |
2271 | r = process_signal(e, ev_queue[i].events); | |
79e16ce3 | 2272 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2273 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
fd38203a LP |
2274 | else |
2275 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2276 | ||
2277 | if (r < 0) | |
da7e457c | 2278 | goto finish; |
fd38203a LP |
2279 | } |
2280 | ||
cde93897 LP |
2281 | r = process_watchdog(e); |
2282 | if (r < 0) | |
2283 | goto finish; | |
2284 | ||
6a0f1f6d LP |
2285 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2286 | if (r < 0) | |
2287 | goto finish; | |
2288 | ||
a8548816 TG |
2289 | r = process_timer(e, e->timestamp_boottime, &e->boottime); |
2290 | if (r < 0) | |
2291 | goto finish; | |
2292 | ||
6a0f1f6d LP |
2293 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2294 | if (r < 0) | |
2295 | goto finish; | |
2296 | ||
2297 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2298 | if (r < 0) |
da7e457c | 2299 | goto finish; |
fd38203a | 2300 | |
6a0f1f6d | 2301 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2302 | if (r < 0) |
da7e457c | 2303 | goto finish; |
fd38203a | 2304 | |
c2ba3ad6 | 2305 | if (e->need_process_child) { |
fd38203a LP |
2306 | r = process_child(e); |
2307 | if (r < 0) | |
da7e457c | 2308 | goto finish; |
fd38203a LP |
2309 | } |
2310 | ||
c2ba3ad6 | 2311 | p = event_next_pending(e); |
da7e457c | 2312 | if (!p) { |
eec6022c | 2313 | r = !timedout; |
da7e457c LP |
2314 | goto finish; |
2315 | } | |
2316 | ||
2317 | r = source_dispatch(p); | |
fd38203a | 2318 | |
da7e457c LP |
2319 | finish: |
2320 | e->state = SD_EVENT_PASSIVE; | |
2321 | sd_event_unref(e); | |
2322 | ||
2323 | return r; | |
fd38203a LP |
2324 | } |
2325 | ||
f7262a9f | 2326 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2327 | int r; |
2328 | ||
da7e457c LP |
2329 | assert_return(e, -EINVAL); |
2330 | assert_return(!event_pid_changed(e), -ECHILD); | |
2331 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2332 | ||
2333 | sd_event_ref(e); | |
fd38203a | 2334 | |
da7e457c | 2335 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2336 | r = sd_event_run(e, (uint64_t) -1); |
2337 | if (r < 0) | |
da7e457c | 2338 | goto finish; |
fd38203a LP |
2339 | } |
2340 | ||
6203e07a | 2341 | r = e->exit_code; |
da7e457c LP |
2342 | |
2343 | finish: | |
2344 | sd_event_unref(e); | |
2345 | return r; | |
fd38203a LP |
2346 | } |
2347 | ||
f7262a9f | 2348 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2349 | assert_return(e, -EINVAL); |
2350 | assert_return(!event_pid_changed(e), -ECHILD); | |
2351 | ||
2352 | return e->state; | |
2353 | } | |
2354 | ||
6203e07a | 2355 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2356 | assert_return(e, -EINVAL); |
6203e07a | 2357 | assert_return(code, -EINVAL); |
da7e457c | 2358 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2359 | |
6203e07a LP |
2360 | if (!e->exit_requested) |
2361 | return -ENODATA; | |
2362 | ||
2363 | *code = e->exit_code; | |
2364 | return 0; | |
fd38203a LP |
2365 | } |
2366 | ||
6203e07a | 2367 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2368 | assert_return(e, -EINVAL); |
2369 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2370 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2371 | |
6203e07a LP |
2372 | e->exit_requested = true; |
2373 | e->exit_code = code; | |
2374 | ||
fd38203a LP |
2375 | return 0; |
2376 | } | |
46e8c825 | 2377 | |
6a0f1f6d | 2378 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2379 | assert_return(e, -EINVAL); |
2380 | assert_return(usec, -EINVAL); | |
46e8c825 LP |
2381 | assert_return(!event_pid_changed(e), -ECHILD); |
2382 | ||
6a0f1f6d LP |
2383 | /* If we haven't run yet, just get the actual time */ |
2384 | if (!dual_timestamp_is_set(&e->timestamp)) | |
2385 | return -ENODATA; | |
46e8c825 | 2386 | |
6a0f1f6d LP |
2387 | switch (clock) { |
2388 | ||
2389 | case CLOCK_REALTIME: | |
2390 | case CLOCK_REALTIME_ALARM: | |
2391 | *usec = e->timestamp.realtime; | |
2392 | break; | |
2393 | ||
2394 | case CLOCK_MONOTONIC: | |
2395 | *usec = e->timestamp.monotonic; | |
2396 | break; | |
2397 | ||
a8548816 | 2398 | case CLOCK_BOOTTIME: |
6a0f1f6d LP |
2399 | case CLOCK_BOOTTIME_ALARM: |
2400 | *usec = e->timestamp_boottime; | |
2401 | break; | |
2402 | } | |
46e8c825 | 2403 | |
46e8c825 LP |
2404 | return 0; |
2405 | } | |
afc6adb5 LP |
2406 | |
2407 | _public_ int sd_event_default(sd_event **ret) { | |
2408 | ||
ec202eae | 2409 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2410 | sd_event *e = NULL; |
afc6adb5 LP |
2411 | int r; |
2412 | ||
2413 | if (!ret) | |
2414 | return !!default_event; | |
2415 | ||
2416 | if (default_event) { | |
2417 | *ret = sd_event_ref(default_event); | |
2418 | return 0; | |
2419 | } | |
2420 | ||
2421 | r = sd_event_new(&e); | |
2422 | if (r < 0) | |
2423 | return r; | |
2424 | ||
2425 | e->default_event_ptr = &default_event; | |
2426 | e->tid = gettid(); | |
2427 | default_event = e; | |
2428 | ||
2429 | *ret = e; | |
2430 | return 1; | |
2431 | } | |
2432 | ||
2433 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2434 | assert_return(e, -EINVAL); | |
2435 | assert_return(tid, -EINVAL); | |
76b54375 | 2436 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2437 | |
76b54375 LP |
2438 | if (e->tid != 0) { |
2439 | *tid = e->tid; | |
2440 | return 0; | |
2441 | } | |
2442 | ||
2443 | return -ENXIO; | |
afc6adb5 | 2444 | } |
cde93897 LP |
2445 | |
2446 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2447 | int r; | |
2448 | ||
2449 | assert_return(e, -EINVAL); | |
8f726607 | 2450 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2451 | |
2452 | if (e->watchdog == !!b) | |
2453 | return e->watchdog; | |
2454 | ||
2455 | if (b) { | |
2456 | struct epoll_event ev = {}; | |
cde93897 | 2457 | |
09812eb7 LP |
2458 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2459 | if (r <= 0) | |
cde93897 | 2460 | return r; |
cde93897 LP |
2461 | |
2462 | /* Issue first ping immediately */ | |
2463 | sd_notify(false, "WATCHDOG=1"); | |
2464 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2465 | ||
2466 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2467 | if (e->watchdog_fd < 0) | |
2468 | return -errno; | |
2469 | ||
2470 | r = arm_watchdog(e); | |
2471 | if (r < 0) | |
2472 | goto fail; | |
2473 | ||
2474 | ev.events = EPOLLIN; | |
2475 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2476 | ||
2477 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2478 | if (r < 0) { | |
2479 | r = -errno; | |
2480 | goto fail; | |
2481 | } | |
2482 | ||
2483 | } else { | |
2484 | if (e->watchdog_fd >= 0) { | |
2485 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2486 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2487 | } |
2488 | } | |
2489 | ||
2490 | e->watchdog = !!b; | |
2491 | return e->watchdog; | |
2492 | ||
2493 | fail: | |
03e334a1 | 2494 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2495 | return r; |
2496 | } | |
8f726607 LP |
2497 | |
2498 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2499 | assert_return(e, -EINVAL); | |
2500 | assert_return(!event_pid_changed(e), -ECHILD); | |
2501 | ||
2502 | return e->watchdog; | |
2503 | } |