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fd38203a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/epoll.h> | |
23 | #include <sys/timerfd.h> | |
24 | #include <sys/wait.h> | |
25 | ||
afc6adb5 | 26 | #include "sd-id128.h" |
cde93897 | 27 | #include "sd-daemon.h" |
fd38203a | 28 | #include "macro.h" |
fd38203a LP |
29 | #include "prioq.h" |
30 | #include "hashmap.h" | |
31 | #include "util.h" | |
32 | #include "time-util.h" | |
afc6adb5 | 33 | #include "missing.h" |
6e9feda3 | 34 | #include "set.h" |
a71fe8b8 | 35 | #include "list.h" |
24882e06 | 36 | #include "signal-util.h" |
fd38203a LP |
37 | |
38 | #include "sd-event.h" | |
39 | ||
c2ba3ad6 | 40 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
41 | |
42 | typedef enum EventSourceType { | |
43 | SOURCE_IO, | |
6a0f1f6d | 44 | SOURCE_TIME_REALTIME, |
a8548816 | 45 | SOURCE_TIME_BOOTTIME, |
6a0f1f6d LP |
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 | ||
a8548816 | 59 | #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 | 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 | |
356779df | 68 | char *description; |
f7f53e9e | 69 | |
6a0f1f6d | 70 | EventSourceType type:5; |
baf76283 | 71 | int enabled:3; |
fd38203a | 72 | bool pending:1; |
12179984 | 73 | bool dispatching:1; |
a71fe8b8 | 74 | bool floating:1; |
fd38203a | 75 | |
31927c16 | 76 | int64_t priority; |
fd38203a LP |
77 | unsigned pending_index; |
78 | unsigned prepare_index; | |
79 | unsigned pending_iteration; | |
80 | unsigned prepare_iteration; | |
81 | ||
a71fe8b8 LP |
82 | LIST_FIELDS(sd_event_source, sources); |
83 | ||
fd38203a LP |
84 | union { |
85 | struct { | |
718db961 | 86 | sd_event_io_handler_t callback; |
fd38203a LP |
87 | int fd; |
88 | uint32_t events; | |
89 | uint32_t revents; | |
90 | bool registered:1; | |
91 | } io; | |
92 | struct { | |
718db961 | 93 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
94 | usec_t next, accuracy; |
95 | unsigned earliest_index; | |
96 | unsigned latest_index; | |
fd38203a LP |
97 | } time; |
98 | struct { | |
718db961 | 99 | sd_event_signal_handler_t callback; |
fd38203a LP |
100 | struct signalfd_siginfo siginfo; |
101 | int sig; | |
102 | } signal; | |
103 | struct { | |
718db961 | 104 | sd_event_child_handler_t callback; |
fd38203a LP |
105 | siginfo_t siginfo; |
106 | pid_t pid; | |
107 | int options; | |
108 | } child; | |
109 | struct { | |
718db961 | 110 | sd_event_handler_t callback; |
fd38203a | 111 | } defer; |
6e9feda3 LP |
112 | struct { |
113 | sd_event_handler_t callback; | |
114 | } post; | |
da7e457c | 115 | struct { |
718db961 | 116 | sd_event_handler_t callback; |
da7e457c | 117 | unsigned prioq_index; |
6203e07a | 118 | } exit; |
fd38203a LP |
119 | }; |
120 | }; | |
121 | ||
6a0f1f6d LP |
122 | struct clock_data { |
123 | int fd; | |
124 | ||
125 | /* For all clocks we maintain two priority queues each, one | |
126 | * ordered for the earliest times the events may be | |
127 | * dispatched, and one ordered by the latest times they must | |
128 | * have been dispatched. The range between the top entries in | |
129 | * the two prioqs is the time window we can freely schedule | |
130 | * wakeups in */ | |
131 | ||
132 | Prioq *earliest; | |
133 | Prioq *latest; | |
134 | usec_t next; | |
212bbb17 TG |
135 | |
136 | bool needs_rearm:1; | |
6a0f1f6d LP |
137 | }; |
138 | ||
fd38203a | 139 | struct sd_event { |
da7e457c | 140 | unsigned n_ref; |
fd38203a LP |
141 | |
142 | int epoll_fd; | |
143 | int signal_fd; | |
cde93897 | 144 | int watchdog_fd; |
fd38203a LP |
145 | |
146 | Prioq *pending; | |
147 | Prioq *prepare; | |
c2ba3ad6 | 148 | |
a8548816 | 149 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
150 | * can add support for more clocks when the kernel learns to |
151 | * deal with them, too. */ | |
152 | struct clock_data realtime; | |
a8548816 | 153 | struct clock_data boottime; |
6a0f1f6d LP |
154 | struct clock_data monotonic; |
155 | struct clock_data realtime_alarm; | |
156 | struct clock_data boottime_alarm; | |
fd38203a | 157 | |
da7e457c LP |
158 | usec_t perturb; |
159 | ||
fd38203a LP |
160 | sigset_t sigset; |
161 | sd_event_source **signal_sources; | |
162 | ||
163 | Hashmap *child_sources; | |
baf76283 | 164 | unsigned n_enabled_child_sources; |
fd38203a | 165 | |
6e9feda3 LP |
166 | Set *post_sources; |
167 | ||
6203e07a | 168 | Prioq *exit; |
fd38203a | 169 | |
da7e457c | 170 | pid_t original_pid; |
c2ba3ad6 | 171 | |
da7e457c | 172 | unsigned iteration; |
46e8c825 | 173 | dual_timestamp timestamp; |
6a0f1f6d | 174 | usec_t timestamp_boottime; |
da7e457c | 175 | int state; |
eaa3cbef | 176 | |
6203e07a | 177 | bool exit_requested:1; |
da7e457c | 178 | bool need_process_child:1; |
cde93897 | 179 | bool watchdog:1; |
afc6adb5 | 180 | |
6203e07a LP |
181 | int exit_code; |
182 | ||
afc6adb5 LP |
183 | pid_t tid; |
184 | sd_event **default_event_ptr; | |
cde93897 LP |
185 | |
186 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
187 | |
188 | unsigned n_sources; | |
a71fe8b8 LP |
189 | |
190 | LIST_HEAD(sd_event_source, sources); | |
fd38203a LP |
191 | }; |
192 | ||
a71fe8b8 LP |
193 | static void source_disconnect(sd_event_source *s); |
194 | ||
fd38203a LP |
195 | static int pending_prioq_compare(const void *a, const void *b) { |
196 | const sd_event_source *x = a, *y = b; | |
197 | ||
198 | assert(x->pending); | |
199 | assert(y->pending); | |
200 | ||
baf76283 LP |
201 | /* Enabled ones first */ |
202 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 203 | return -1; |
baf76283 | 204 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
205 | return 1; |
206 | ||
207 | /* Lower priority values first */ | |
208 | if (x->priority < y->priority) | |
209 | return -1; | |
210 | if (x->priority > y->priority) | |
211 | return 1; | |
212 | ||
213 | /* Older entries first */ | |
214 | if (x->pending_iteration < y->pending_iteration) | |
215 | return -1; | |
216 | if (x->pending_iteration > y->pending_iteration) | |
217 | return 1; | |
218 | ||
219 | /* Stability for the rest */ | |
220 | if (x < y) | |
221 | return -1; | |
dfcd88f6 | 222 | if (x > y) |
fd38203a LP |
223 | return 1; |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static int prepare_prioq_compare(const void *a, const void *b) { | |
229 | const sd_event_source *x = a, *y = b; | |
230 | ||
231 | assert(x->prepare); | |
232 | assert(y->prepare); | |
233 | ||
234 | /* Move most recently prepared ones last, so that we can stop | |
235 | * preparing as soon as we hit one that has already been | |
236 | * prepared in the current iteration */ | |
237 | if (x->prepare_iteration < y->prepare_iteration) | |
238 | return -1; | |
239 | if (x->prepare_iteration > y->prepare_iteration) | |
240 | return 1; | |
241 | ||
baf76283 LP |
242 | /* Enabled ones first */ |
243 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 244 | return -1; |
baf76283 | 245 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
246 | return 1; |
247 | ||
248 | /* Lower priority values first */ | |
249 | if (x->priority < y->priority) | |
250 | return -1; | |
251 | if (x->priority > y->priority) | |
252 | return 1; | |
253 | ||
254 | /* Stability for the rest */ | |
255 | if (x < y) | |
256 | return -1; | |
dfcd88f6 | 257 | if (x > y) |
fd38203a LP |
258 | return 1; |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
c2ba3ad6 | 263 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
264 | const sd_event_source *x = a, *y = b; |
265 | ||
6a0f1f6d LP |
266 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
267 | assert(x->type == y->type); | |
fd38203a | 268 | |
baf76283 LP |
269 | /* Enabled ones first */ |
270 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 271 | return -1; |
baf76283 | 272 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
273 | return 1; |
274 | ||
275 | /* Move the pending ones to the end */ | |
276 | if (!x->pending && y->pending) | |
277 | return -1; | |
278 | if (x->pending && !y->pending) | |
279 | return 1; | |
280 | ||
281 | /* Order by time */ | |
282 | if (x->time.next < y->time.next) | |
283 | return -1; | |
284 | if (x->time.next > y->time.next) | |
a99badf5 | 285 | return 1; |
fd38203a LP |
286 | |
287 | /* Stability for the rest */ | |
288 | if (x < y) | |
289 | return -1; | |
dfcd88f6 | 290 | if (x > y) |
fd38203a LP |
291 | return 1; |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
c2ba3ad6 LP |
296 | static int latest_time_prioq_compare(const void *a, const void *b) { |
297 | const sd_event_source *x = a, *y = b; | |
298 | ||
6a0f1f6d LP |
299 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
300 | assert(x->type == y->type); | |
c2ba3ad6 | 301 | |
baf76283 LP |
302 | /* Enabled ones first */ |
303 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 304 | return -1; |
baf76283 | 305 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
306 | return 1; |
307 | ||
308 | /* Move the pending ones to the end */ | |
309 | if (!x->pending && y->pending) | |
310 | return -1; | |
311 | if (x->pending && !y->pending) | |
312 | return 1; | |
313 | ||
314 | /* Order by time */ | |
315 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
316 | return -1; | |
317 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
a99badf5 | 318 | return 1; |
c2ba3ad6 LP |
319 | |
320 | /* Stability for the rest */ | |
321 | if (x < y) | |
322 | return -1; | |
323 | if (x > y) | |
324 | return 1; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
6203e07a | 329 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
330 | const sd_event_source *x = a, *y = b; |
331 | ||
6203e07a LP |
332 | assert(x->type == SOURCE_EXIT); |
333 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 334 | |
baf76283 LP |
335 | /* Enabled ones first */ |
336 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 337 | return -1; |
baf76283 | 338 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
339 | return 1; |
340 | ||
341 | /* Lower priority values first */ | |
342 | if (x->priority < y->priority) | |
343 | return -1; | |
344 | if (x->priority > y->priority) | |
345 | return 1; | |
346 | ||
347 | /* Stability for the rest */ | |
348 | if (x < y) | |
349 | return -1; | |
350 | if (x > y) | |
351 | return 1; | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
6a0f1f6d LP |
356 | static void free_clock_data(struct clock_data *d) { |
357 | assert(d); | |
358 | ||
359 | safe_close(d->fd); | |
360 | prioq_free(d->earliest); | |
361 | prioq_free(d->latest); | |
362 | } | |
363 | ||
fd38203a | 364 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
365 | sd_event_source *s; |
366 | ||
fd38203a | 367 | assert(e); |
a71fe8b8 LP |
368 | |
369 | while ((s = e->sources)) { | |
370 | assert(s->floating); | |
371 | source_disconnect(s); | |
372 | sd_event_source_unref(s); | |
373 | } | |
374 | ||
15b38f93 | 375 | assert(e->n_sources == 0); |
fd38203a | 376 | |
afc6adb5 LP |
377 | if (e->default_event_ptr) |
378 | *(e->default_event_ptr) = NULL; | |
379 | ||
03e334a1 LP |
380 | safe_close(e->epoll_fd); |
381 | safe_close(e->signal_fd); | |
03e334a1 | 382 | safe_close(e->watchdog_fd); |
cde93897 | 383 | |
6a0f1f6d | 384 | free_clock_data(&e->realtime); |
a8548816 | 385 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
386 | free_clock_data(&e->monotonic); |
387 | free_clock_data(&e->realtime_alarm); | |
388 | free_clock_data(&e->boottime_alarm); | |
389 | ||
fd38203a LP |
390 | prioq_free(e->pending); |
391 | prioq_free(e->prepare); | |
6203e07a | 392 | prioq_free(e->exit); |
fd38203a LP |
393 | |
394 | free(e->signal_sources); | |
395 | ||
396 | hashmap_free(e->child_sources); | |
6e9feda3 | 397 | set_free(e->post_sources); |
fd38203a LP |
398 | free(e); |
399 | } | |
400 | ||
f7262a9f | 401 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
402 | sd_event *e; |
403 | int r; | |
404 | ||
305f78bf | 405 | assert_return(ret, -EINVAL); |
fd38203a LP |
406 | |
407 | e = new0(sd_event, 1); | |
408 | if (!e) | |
409 | return -ENOMEM; | |
410 | ||
da7e457c | 411 | e->n_ref = 1; |
a8548816 | 412 | 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; |
3a43da28 | 413 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
eaa3cbef | 414 | e->original_pid = getpid(); |
3a43da28 | 415 | e->perturb = USEC_INFINITY; |
fd38203a LP |
416 | |
417 | assert_se(sigemptyset(&e->sigset) == 0); | |
418 | ||
419 | e->pending = prioq_new(pending_prioq_compare); | |
420 | if (!e->pending) { | |
421 | r = -ENOMEM; | |
422 | goto fail; | |
423 | } | |
424 | ||
425 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
426 | if (e->epoll_fd < 0) { | |
427 | r = -errno; | |
428 | goto fail; | |
429 | } | |
430 | ||
431 | *ret = e; | |
432 | return 0; | |
433 | ||
434 | fail: | |
435 | event_free(e); | |
436 | return r; | |
437 | } | |
438 | ||
f7262a9f | 439 | _public_ sd_event* sd_event_ref(sd_event *e) { |
305f78bf | 440 | assert_return(e, NULL); |
fd38203a | 441 | |
da7e457c LP |
442 | assert(e->n_ref >= 1); |
443 | e->n_ref++; | |
fd38203a LP |
444 | |
445 | return e; | |
446 | } | |
447 | ||
f7262a9f | 448 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
449 | |
450 | if (!e) | |
451 | return NULL; | |
fd38203a | 452 | |
da7e457c LP |
453 | assert(e->n_ref >= 1); |
454 | e->n_ref--; | |
455 | ||
456 | if (e->n_ref <= 0) | |
fd38203a LP |
457 | event_free(e); |
458 | ||
459 | return NULL; | |
460 | } | |
461 | ||
eaa3cbef LP |
462 | static bool event_pid_changed(sd_event *e) { |
463 | assert(e); | |
464 | ||
a2360a46 | 465 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
466 | * it around over a fork(). Let's complain. */ |
467 | ||
468 | return e->original_pid != getpid(); | |
469 | } | |
470 | ||
366e6411 | 471 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
472 | int r; |
473 | ||
474 | assert(s); | |
475 | assert(s->type == SOURCE_IO); | |
476 | ||
f6806734 | 477 | if (event_pid_changed(s->event)) |
366e6411 | 478 | return; |
f6806734 | 479 | |
fd38203a | 480 | if (!s->io.registered) |
366e6411 | 481 | return; |
fd38203a LP |
482 | |
483 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
366e6411 | 484 | assert_log(r >= 0); |
fd38203a LP |
485 | |
486 | s->io.registered = false; | |
fd38203a LP |
487 | } |
488 | ||
305f78bf LP |
489 | static int source_io_register( |
490 | sd_event_source *s, | |
491 | int enabled, | |
492 | uint32_t events) { | |
493 | ||
fd38203a LP |
494 | struct epoll_event ev = {}; |
495 | int r; | |
496 | ||
497 | assert(s); | |
498 | assert(s->type == SOURCE_IO); | |
baf76283 | 499 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
500 | |
501 | ev.events = events; | |
502 | ev.data.ptr = s; | |
503 | ||
baf76283 | 504 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
505 | ev.events |= EPOLLONESHOT; |
506 | ||
507 | if (s->io.registered) | |
508 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
509 | else | |
510 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
511 | ||
512 | if (r < 0) | |
513 | return -errno; | |
514 | ||
515 | s->io.registered = true; | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
6a0f1f6d LP |
520 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
521 | ||
522 | switch (t) { | |
523 | ||
524 | case SOURCE_TIME_REALTIME: | |
525 | return CLOCK_REALTIME; | |
526 | ||
a8548816 TG |
527 | case SOURCE_TIME_BOOTTIME: |
528 | return CLOCK_BOOTTIME; | |
529 | ||
6a0f1f6d LP |
530 | case SOURCE_TIME_MONOTONIC: |
531 | return CLOCK_MONOTONIC; | |
532 | ||
533 | case SOURCE_TIME_REALTIME_ALARM: | |
534 | return CLOCK_REALTIME_ALARM; | |
535 | ||
536 | case SOURCE_TIME_BOOTTIME_ALARM: | |
537 | return CLOCK_BOOTTIME_ALARM; | |
538 | ||
539 | default: | |
540 | return (clockid_t) -1; | |
541 | } | |
542 | } | |
543 | ||
544 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
545 | ||
546 | switch (clock) { | |
547 | ||
548 | case CLOCK_REALTIME: | |
549 | return SOURCE_TIME_REALTIME; | |
550 | ||
a8548816 TG |
551 | case CLOCK_BOOTTIME: |
552 | return SOURCE_TIME_BOOTTIME; | |
553 | ||
6a0f1f6d LP |
554 | case CLOCK_MONOTONIC: |
555 | return SOURCE_TIME_MONOTONIC; | |
556 | ||
557 | case CLOCK_REALTIME_ALARM: | |
558 | return SOURCE_TIME_REALTIME_ALARM; | |
559 | ||
560 | case CLOCK_BOOTTIME_ALARM: | |
561 | return SOURCE_TIME_BOOTTIME_ALARM; | |
562 | ||
563 | default: | |
564 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
565 | } | |
566 | } | |
567 | ||
568 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
569 | assert(e); | |
570 | ||
571 | switch (t) { | |
572 | ||
573 | case SOURCE_TIME_REALTIME: | |
574 | return &e->realtime; | |
575 | ||
a8548816 TG |
576 | case SOURCE_TIME_BOOTTIME: |
577 | return &e->boottime; | |
578 | ||
6a0f1f6d LP |
579 | case SOURCE_TIME_MONOTONIC: |
580 | return &e->monotonic; | |
581 | ||
582 | case SOURCE_TIME_REALTIME_ALARM: | |
583 | return &e->realtime_alarm; | |
584 | ||
585 | case SOURCE_TIME_BOOTTIME_ALARM: | |
586 | return &e->boottime_alarm; | |
587 | ||
588 | default: | |
589 | return NULL; | |
590 | } | |
591 | } | |
592 | ||
4807d2d0 ZJS |
593 | static bool need_signal(sd_event *e, int signal) { |
594 | return (e->signal_sources && e->signal_sources[signal] && | |
595 | e->signal_sources[signal]->enabled != SD_EVENT_OFF) | |
596 | || | |
597 | (signal == SIGCHLD && | |
598 | e->n_enabled_child_sources > 0); | |
599 | } | |
600 | ||
f95387cd ZJS |
601 | static int event_update_signal_fd(sd_event *e) { |
602 | struct epoll_event ev = {}; | |
603 | bool add_to_epoll; | |
604 | int r; | |
605 | ||
606 | assert(e); | |
607 | ||
f6806734 TG |
608 | if (event_pid_changed(e)) |
609 | return 0; | |
610 | ||
f95387cd ZJS |
611 | add_to_epoll = e->signal_fd < 0; |
612 | ||
613 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
614 | if (r < 0) | |
615 | return -errno; | |
616 | ||
617 | e->signal_fd = r; | |
618 | ||
619 | if (!add_to_epoll) | |
620 | return 0; | |
621 | ||
622 | ev.events = EPOLLIN; | |
623 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
624 | ||
625 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
626 | if (r < 0) { | |
627 | e->signal_fd = safe_close(e->signal_fd); | |
628 | return -errno; | |
629 | } | |
630 | ||
631 | return 0; | |
632 | } | |
633 | ||
a71fe8b8 LP |
634 | static void source_disconnect(sd_event_source *s) { |
635 | sd_event *event; | |
636 | ||
fd38203a LP |
637 | assert(s); |
638 | ||
a71fe8b8 LP |
639 | if (!s->event) |
640 | return; | |
15b38f93 | 641 | |
a71fe8b8 | 642 | assert(s->event->n_sources > 0); |
fd38203a | 643 | |
a71fe8b8 | 644 | switch (s->type) { |
fd38203a | 645 | |
a71fe8b8 LP |
646 | case SOURCE_IO: |
647 | if (s->io.fd >= 0) | |
648 | source_io_unregister(s); | |
fd38203a | 649 | |
a71fe8b8 | 650 | break; |
6a0f1f6d | 651 | |
a71fe8b8 | 652 | case SOURCE_TIME_REALTIME: |
a8548816 | 653 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
654 | case SOURCE_TIME_MONOTONIC: |
655 | case SOURCE_TIME_REALTIME_ALARM: | |
656 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
657 | struct clock_data *d; | |
fd38203a | 658 | |
a71fe8b8 LP |
659 | d = event_get_clock_data(s->event, s->type); |
660 | assert(d); | |
661 | ||
662 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
663 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 664 | d->needs_rearm = true; |
a71fe8b8 LP |
665 | break; |
666 | } | |
667 | ||
668 | case SOURCE_SIGNAL: | |
669 | if (s->signal.sig > 0) { | |
a71fe8b8 LP |
670 | if (s->event->signal_sources) |
671 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 ZJS |
672 | |
673 | /* If the signal was on and now it is off... */ | |
674 | if (s->enabled != SD_EVENT_OFF && !need_signal(s->event, s->signal.sig)) { | |
675 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); | |
f95387cd ZJS |
676 | |
677 | (void) event_update_signal_fd(s->event); | |
678 | /* If disabling failed, we might get a spurious event, | |
679 | * but otherwise nothing bad should happen. */ | |
4807d2d0 | 680 | } |
6a0f1f6d | 681 | } |
fd38203a | 682 | |
a71fe8b8 | 683 | break; |
fd38203a | 684 | |
a71fe8b8 LP |
685 | case SOURCE_CHILD: |
686 | if (s->child.pid > 0) { | |
687 | if (s->enabled != SD_EVENT_OFF) { | |
688 | assert(s->event->n_enabled_child_sources > 0); | |
689 | s->event->n_enabled_child_sources--; | |
fd38203a | 690 | |
4807d2d0 ZJS |
691 | /* We know the signal was on, if it is off now... */ |
692 | if (!need_signal(s->event, SIGCHLD)) { | |
693 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
f95387cd ZJS |
694 | |
695 | (void) event_update_signal_fd(s->event); | |
696 | /* If disabling failed, we might get a spurious event, | |
697 | * but otherwise nothing bad should happen. */ | |
4807d2d0 ZJS |
698 | } |
699 | } | |
fd38203a | 700 | |
a71fe8b8 LP |
701 | hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid)); |
702 | } | |
fd38203a | 703 | |
a71fe8b8 | 704 | break; |
fd38203a | 705 | |
a71fe8b8 LP |
706 | case SOURCE_DEFER: |
707 | /* nothing */ | |
708 | break; | |
fd38203a | 709 | |
a71fe8b8 LP |
710 | case SOURCE_POST: |
711 | set_remove(s->event->post_sources, s); | |
712 | break; | |
da7e457c | 713 | |
a71fe8b8 LP |
714 | case SOURCE_EXIT: |
715 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
716 | break; | |
0eb2e0e3 | 717 | |
a71fe8b8 LP |
718 | default: |
719 | assert_not_reached("Wut? I shouldn't exist."); | |
720 | } | |
6e9feda3 | 721 | |
a71fe8b8 LP |
722 | if (s->pending) |
723 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 724 | |
a71fe8b8 LP |
725 | if (s->prepare) |
726 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 727 | |
a71fe8b8 | 728 | event = s->event; |
fd38203a | 729 | |
a71fe8b8 LP |
730 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
731 | s->event = NULL; | |
732 | LIST_REMOVE(sources, event->sources, s); | |
733 | event->n_sources--; | |
fd38203a | 734 | |
a71fe8b8 LP |
735 | if (!s->floating) |
736 | sd_event_unref(event); | |
737 | } | |
738 | ||
739 | static void source_free(sd_event_source *s) { | |
740 | assert(s); | |
fd38203a | 741 | |
a71fe8b8 | 742 | source_disconnect(s); |
356779df | 743 | free(s->description); |
fd38203a LP |
744 | free(s); |
745 | } | |
746 | ||
747 | static int source_set_pending(sd_event_source *s, bool b) { | |
748 | int r; | |
749 | ||
750 | assert(s); | |
6203e07a | 751 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
752 | |
753 | if (s->pending == b) | |
754 | return 0; | |
755 | ||
756 | s->pending = b; | |
757 | ||
758 | if (b) { | |
759 | s->pending_iteration = s->event->iteration; | |
760 | ||
761 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
762 | if (r < 0) { | |
763 | s->pending = false; | |
764 | return r; | |
765 | } | |
766 | } else | |
767 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
768 | ||
6a0f1f6d LP |
769 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
770 | struct clock_data *d; | |
771 | ||
772 | d = event_get_clock_data(s->event, s->type); | |
773 | assert(d); | |
774 | ||
775 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
776 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 777 | d->needs_rearm = true; |
2576a19e LP |
778 | } |
779 | ||
fd38203a LP |
780 | return 0; |
781 | } | |
782 | ||
a71fe8b8 | 783 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
784 | sd_event_source *s; |
785 | ||
786 | assert(e); | |
787 | ||
788 | s = new0(sd_event_source, 1); | |
789 | if (!s) | |
790 | return NULL; | |
791 | ||
da7e457c | 792 | s->n_ref = 1; |
a71fe8b8 | 793 | s->event = e; |
4a134c49 | 794 | s->floating = floating; |
fd38203a | 795 | s->type = type; |
fd38203a | 796 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
797 | |
798 | if (!floating) | |
799 | sd_event_ref(e); | |
fd38203a | 800 | |
a71fe8b8 | 801 | LIST_PREPEND(sources, e->sources, s); |
15b38f93 LP |
802 | e->n_sources ++; |
803 | ||
fd38203a LP |
804 | return s; |
805 | } | |
806 | ||
f7262a9f | 807 | _public_ int sd_event_add_io( |
fd38203a | 808 | sd_event *e, |
151b9b96 | 809 | sd_event_source **ret, |
fd38203a LP |
810 | int fd, |
811 | uint32_t events, | |
718db961 | 812 | sd_event_io_handler_t callback, |
151b9b96 | 813 | void *userdata) { |
fd38203a LP |
814 | |
815 | sd_event_source *s; | |
816 | int r; | |
817 | ||
305f78bf | 818 | assert_return(e, -EINVAL); |
8ac43fee | 819 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 820 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 821 | assert_return(callback, -EINVAL); |
da7e457c | 822 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 823 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 824 | |
a71fe8b8 | 825 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
826 | if (!s) |
827 | return -ENOMEM; | |
828 | ||
829 | s->io.fd = fd; | |
830 | s->io.events = events; | |
831 | s->io.callback = callback; | |
832 | s->userdata = userdata; | |
baf76283 | 833 | s->enabled = SD_EVENT_ON; |
fd38203a | 834 | |
baf76283 | 835 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
836 | if (r < 0) { |
837 | source_free(s); | |
050f74f2 | 838 | return r; |
fd38203a LP |
839 | } |
840 | ||
a71fe8b8 LP |
841 | if (ret) |
842 | *ret = s; | |
843 | ||
fd38203a LP |
844 | return 0; |
845 | } | |
846 | ||
52444dc4 LP |
847 | static void initialize_perturb(sd_event *e) { |
848 | sd_id128_t bootid = {}; | |
849 | ||
850 | /* When we sleep for longer, we try to realign the wakeup to | |
851 | the same time wihtin each minute/second/250ms, so that | |
852 | events all across the system can be coalesced into a single | |
853 | CPU wakeup. However, let's take some system-specific | |
854 | randomness for this value, so that in a network of systems | |
855 | with synced clocks timer events are distributed a | |
856 | bit. Here, we calculate a perturbation usec offset from the | |
857 | boot ID. */ | |
858 | ||
3a43da28 | 859 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
860 | return; |
861 | ||
862 | if (sd_id128_get_boot(&bootid) >= 0) | |
863 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
864 | } | |
865 | ||
fd38203a LP |
866 | static int event_setup_timer_fd( |
867 | sd_event *e, | |
6a0f1f6d LP |
868 | struct clock_data *d, |
869 | clockid_t clock) { | |
fd38203a LP |
870 | |
871 | struct epoll_event ev = {}; | |
872 | int r, fd; | |
873 | ||
874 | assert(e); | |
6a0f1f6d | 875 | assert(d); |
fd38203a | 876 | |
6a0f1f6d | 877 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
878 | return 0; |
879 | ||
6a0f1f6d | 880 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
881 | if (fd < 0) |
882 | return -errno; | |
883 | ||
884 | ev.events = EPOLLIN; | |
6a0f1f6d | 885 | ev.data.ptr = INT_TO_PTR(clock_to_event_source_type(clock)); |
fd38203a LP |
886 | |
887 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
888 | if (r < 0) { | |
03e334a1 | 889 | safe_close(fd); |
fd38203a LP |
890 | return -errno; |
891 | } | |
892 | ||
6a0f1f6d | 893 | d->fd = fd; |
fd38203a LP |
894 | return 0; |
895 | } | |
896 | ||
c4f1aff2 TG |
897 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
898 | assert(s); | |
899 | ||
900 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
901 | } | |
902 | ||
6a0f1f6d | 903 | _public_ int sd_event_add_time( |
fd38203a | 904 | sd_event *e, |
151b9b96 | 905 | sd_event_source **ret, |
6a0f1f6d | 906 | clockid_t clock, |
fd38203a | 907 | uint64_t usec, |
c2ba3ad6 | 908 | uint64_t accuracy, |
718db961 | 909 | sd_event_time_handler_t callback, |
151b9b96 | 910 | void *userdata) { |
fd38203a | 911 | |
6a0f1f6d | 912 | EventSourceType type; |
fd38203a | 913 | sd_event_source *s; |
6a0f1f6d | 914 | struct clock_data *d; |
fd38203a LP |
915 | int r; |
916 | ||
305f78bf | 917 | assert_return(e, -EINVAL); |
305f78bf LP |
918 | assert_return(usec != (uint64_t) -1, -EINVAL); |
919 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
da7e457c | 920 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 921 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 922 | |
c4f1aff2 TG |
923 | if (!callback) |
924 | callback = time_exit_callback; | |
925 | ||
6a0f1f6d | 926 | type = clock_to_event_source_type(clock); |
15411c0c | 927 | assert_return(type >= 0, -EOPNOTSUPP); |
6a0f1f6d LP |
928 | |
929 | d = event_get_clock_data(e, type); | |
930 | assert(d); | |
c2ba3ad6 | 931 | |
6a0f1f6d LP |
932 | if (!d->earliest) { |
933 | d->earliest = prioq_new(earliest_time_prioq_compare); | |
934 | if (!d->earliest) | |
c2ba3ad6 LP |
935 | return -ENOMEM; |
936 | } | |
fd38203a | 937 | |
6a0f1f6d LP |
938 | if (!d->latest) { |
939 | d->latest = prioq_new(latest_time_prioq_compare); | |
940 | if (!d->latest) | |
fd38203a LP |
941 | return -ENOMEM; |
942 | } | |
943 | ||
6a0f1f6d LP |
944 | if (d->fd < 0) { |
945 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
946 | if (r < 0) |
947 | return r; | |
948 | } | |
949 | ||
a71fe8b8 | 950 | s = source_new(e, !ret, type); |
fd38203a LP |
951 | if (!s) |
952 | return -ENOMEM; | |
953 | ||
954 | s->time.next = usec; | |
c2ba3ad6 | 955 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 956 | s->time.callback = callback; |
da7e457c | 957 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 958 | s->userdata = userdata; |
baf76283 | 959 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 960 | |
e07bbb7c TG |
961 | d->needs_rearm = true; |
962 | ||
6a0f1f6d | 963 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
964 | if (r < 0) |
965 | goto fail; | |
966 | ||
6a0f1f6d | 967 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
968 | if (r < 0) |
969 | goto fail; | |
fd38203a | 970 | |
a71fe8b8 LP |
971 | if (ret) |
972 | *ret = s; | |
973 | ||
fd38203a | 974 | return 0; |
c2ba3ad6 LP |
975 | |
976 | fail: | |
977 | source_free(s); | |
978 | return r; | |
fd38203a LP |
979 | } |
980 | ||
59bc1fd7 LP |
981 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
982 | assert(s); | |
983 | ||
984 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
985 | } | |
986 | ||
f7262a9f | 987 | _public_ int sd_event_add_signal( |
305f78bf | 988 | sd_event *e, |
151b9b96 | 989 | sd_event_source **ret, |
305f78bf | 990 | int sig, |
718db961 | 991 | sd_event_signal_handler_t callback, |
151b9b96 | 992 | void *userdata) { |
305f78bf | 993 | |
fd38203a | 994 | sd_event_source *s; |
3022d74b | 995 | sigset_t ss; |
fd38203a | 996 | int r; |
4807d2d0 | 997 | bool previous; |
fd38203a | 998 | |
305f78bf LP |
999 | assert_return(e, -EINVAL); |
1000 | assert_return(sig > 0, -EINVAL); | |
1001 | assert_return(sig < _NSIG, -EINVAL); | |
da7e457c | 1002 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1003 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1004 | |
59bc1fd7 LP |
1005 | if (!callback) |
1006 | callback = signal_exit_callback; | |
1007 | ||
3022d74b LP |
1008 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
1009 | if (r < 0) | |
1010 | return -errno; | |
1011 | ||
1012 | if (!sigismember(&ss, sig)) | |
1013 | return -EBUSY; | |
1014 | ||
fd38203a LP |
1015 | if (!e->signal_sources) { |
1016 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1017 | if (!e->signal_sources) | |
1018 | return -ENOMEM; | |
1019 | } else if (e->signal_sources[sig]) | |
1020 | return -EBUSY; | |
1021 | ||
4807d2d0 ZJS |
1022 | previous = need_signal(e, sig); |
1023 | ||
a71fe8b8 | 1024 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1025 | if (!s) |
1026 | return -ENOMEM; | |
1027 | ||
1028 | s->signal.sig = sig; | |
1029 | s->signal.callback = callback; | |
1030 | s->userdata = userdata; | |
baf76283 | 1031 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1032 | |
1033 | e->signal_sources[sig] = s; | |
fd38203a | 1034 | |
4807d2d0 ZJS |
1035 | if (!previous) { |
1036 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
1037 | ||
fd38203a LP |
1038 | r = event_update_signal_fd(e); |
1039 | if (r < 0) { | |
1040 | source_free(s); | |
1041 | return r; | |
1042 | } | |
1043 | } | |
1044 | ||
f1f00dbb LP |
1045 | /* Use the signal name as description for the event source by default */ |
1046 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1047 | ||
a71fe8b8 LP |
1048 | if (ret) |
1049 | *ret = s; | |
1050 | ||
fd38203a LP |
1051 | return 0; |
1052 | } | |
1053 | ||
f7262a9f | 1054 | _public_ int sd_event_add_child( |
305f78bf | 1055 | sd_event *e, |
151b9b96 | 1056 | sd_event_source **ret, |
305f78bf LP |
1057 | pid_t pid, |
1058 | int options, | |
718db961 | 1059 | sd_event_child_handler_t callback, |
151b9b96 | 1060 | void *userdata) { |
305f78bf | 1061 | |
fd38203a LP |
1062 | sd_event_source *s; |
1063 | int r; | |
4807d2d0 | 1064 | bool previous; |
fd38203a | 1065 | |
305f78bf LP |
1066 | assert_return(e, -EINVAL); |
1067 | assert_return(pid > 1, -EINVAL); | |
1068 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1069 | assert_return(options != 0, -EINVAL); | |
1070 | assert_return(callback, -EINVAL); | |
da7e457c | 1071 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1072 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1073 | |
d5099efc | 1074 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1075 | if (r < 0) |
1076 | return r; | |
1077 | ||
1078 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
1079 | return -EBUSY; | |
1080 | ||
4807d2d0 ZJS |
1081 | previous = need_signal(e, SIGCHLD); |
1082 | ||
a71fe8b8 | 1083 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1084 | if (!s) |
1085 | return -ENOMEM; | |
1086 | ||
1087 | s->child.pid = pid; | |
1088 | s->child.options = options; | |
1089 | s->child.callback = callback; | |
1090 | s->userdata = userdata; | |
baf76283 | 1091 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1092 | |
1093 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
1094 | if (r < 0) { | |
1095 | source_free(s); | |
1096 | return r; | |
1097 | } | |
1098 | ||
baf76283 | 1099 | e->n_enabled_child_sources ++; |
fd38203a | 1100 | |
4807d2d0 ZJS |
1101 | if (!previous) { |
1102 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
fd38203a | 1103 | |
fd38203a LP |
1104 | r = event_update_signal_fd(e); |
1105 | if (r < 0) { | |
1106 | source_free(s); | |
050f74f2 | 1107 | return r; |
fd38203a LP |
1108 | } |
1109 | } | |
1110 | ||
c2ba3ad6 LP |
1111 | e->need_process_child = true; |
1112 | ||
a71fe8b8 LP |
1113 | if (ret) |
1114 | *ret = s; | |
1115 | ||
fd38203a LP |
1116 | return 0; |
1117 | } | |
1118 | ||
f7262a9f | 1119 | _public_ int sd_event_add_defer( |
305f78bf | 1120 | sd_event *e, |
151b9b96 | 1121 | sd_event_source **ret, |
718db961 | 1122 | sd_event_handler_t callback, |
151b9b96 | 1123 | void *userdata) { |
305f78bf | 1124 | |
fd38203a LP |
1125 | sd_event_source *s; |
1126 | int r; | |
1127 | ||
305f78bf LP |
1128 | assert_return(e, -EINVAL); |
1129 | assert_return(callback, -EINVAL); | |
da7e457c | 1130 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1131 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1132 | |
a71fe8b8 | 1133 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1134 | if (!s) |
1135 | return -ENOMEM; | |
1136 | ||
1137 | s->defer.callback = callback; | |
1138 | s->userdata = userdata; | |
baf76283 | 1139 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1140 | |
1141 | r = source_set_pending(s, true); | |
1142 | if (r < 0) { | |
1143 | source_free(s); | |
1144 | return r; | |
1145 | } | |
1146 | ||
a71fe8b8 LP |
1147 | if (ret) |
1148 | *ret = s; | |
1149 | ||
fd38203a LP |
1150 | return 0; |
1151 | } | |
1152 | ||
6e9feda3 LP |
1153 | _public_ int sd_event_add_post( |
1154 | sd_event *e, | |
1155 | sd_event_source **ret, | |
1156 | sd_event_handler_t callback, | |
1157 | void *userdata) { | |
1158 | ||
1159 | sd_event_source *s; | |
1160 | int r; | |
1161 | ||
1162 | assert_return(e, -EINVAL); | |
1163 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1164 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1165 | assert_return(!event_pid_changed(e), -ECHILD); | |
1166 | ||
d5099efc | 1167 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1168 | if (r < 0) |
1169 | return r; | |
1170 | ||
a71fe8b8 | 1171 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1172 | if (!s) |
1173 | return -ENOMEM; | |
1174 | ||
1175 | s->post.callback = callback; | |
1176 | s->userdata = userdata; | |
1177 | s->enabled = SD_EVENT_ON; | |
1178 | ||
1179 | r = set_put(e->post_sources, s); | |
1180 | if (r < 0) { | |
1181 | source_free(s); | |
1182 | return r; | |
1183 | } | |
1184 | ||
a71fe8b8 LP |
1185 | if (ret) |
1186 | *ret = s; | |
1187 | ||
6e9feda3 LP |
1188 | return 0; |
1189 | } | |
1190 | ||
6203e07a | 1191 | _public_ int sd_event_add_exit( |
305f78bf | 1192 | sd_event *e, |
151b9b96 | 1193 | sd_event_source **ret, |
718db961 | 1194 | sd_event_handler_t callback, |
151b9b96 | 1195 | void *userdata) { |
305f78bf | 1196 | |
da7e457c LP |
1197 | sd_event_source *s; |
1198 | int r; | |
1199 | ||
1200 | assert_return(e, -EINVAL); | |
1201 | assert_return(callback, -EINVAL); | |
1202 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1203 | assert_return(!event_pid_changed(e), -ECHILD); | |
1204 | ||
6203e07a LP |
1205 | if (!e->exit) { |
1206 | e->exit = prioq_new(exit_prioq_compare); | |
1207 | if (!e->exit) | |
da7e457c LP |
1208 | return -ENOMEM; |
1209 | } | |
1210 | ||
a71fe8b8 | 1211 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1212 | if (!s) |
da7e457c | 1213 | return -ENOMEM; |
fd38203a | 1214 | |
6203e07a | 1215 | s->exit.callback = callback; |
da7e457c | 1216 | s->userdata = userdata; |
6203e07a | 1217 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1218 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1219 | |
6203e07a | 1220 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1221 | if (r < 0) { |
1222 | source_free(s); | |
1223 | return r; | |
1224 | } | |
1225 | ||
a71fe8b8 LP |
1226 | if (ret) |
1227 | *ret = s; | |
1228 | ||
da7e457c LP |
1229 | return 0; |
1230 | } | |
1231 | ||
f7262a9f | 1232 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
da7e457c LP |
1233 | assert_return(s, NULL); |
1234 | ||
1235 | assert(s->n_ref >= 1); | |
1236 | s->n_ref++; | |
fd38203a LP |
1237 | |
1238 | return s; | |
1239 | } | |
1240 | ||
f7262a9f | 1241 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1242 | |
1243 | if (!s) | |
1244 | return NULL; | |
fd38203a | 1245 | |
da7e457c LP |
1246 | assert(s->n_ref >= 1); |
1247 | s->n_ref--; | |
1248 | ||
12179984 LP |
1249 | if (s->n_ref <= 0) { |
1250 | /* Here's a special hack: when we are called from a | |
1251 | * dispatch handler we won't free the event source | |
1252 | * immediately, but we will detach the fd from the | |
1253 | * epoll. This way it is safe for the caller to unref | |
1254 | * the event source and immediately close the fd, but | |
1255 | * we still retain a valid event source object after | |
1256 | * the callback. */ | |
1257 | ||
1258 | if (s->dispatching) { | |
1259 | if (s->type == SOURCE_IO) | |
1260 | source_io_unregister(s); | |
a71fe8b8 LP |
1261 | |
1262 | source_disconnect(s); | |
12179984 LP |
1263 | } else |
1264 | source_free(s); | |
1265 | } | |
fd38203a LP |
1266 | |
1267 | return NULL; | |
1268 | } | |
1269 | ||
356779df | 1270 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1271 | assert_return(s, -EINVAL); |
f4b2933e | 1272 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1273 | |
356779df | 1274 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1275 | } |
1276 | ||
356779df | 1277 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1278 | assert_return(s, -EINVAL); |
356779df | 1279 | assert_return(description, -EINVAL); |
f4b2933e LP |
1280 | assert_return(s->description, -ENXIO); |
1281 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
f7f53e9e | 1282 | |
356779df | 1283 | *description = s->description; |
f7f53e9e TG |
1284 | return 0; |
1285 | } | |
1286 | ||
adcc4ca3 | 1287 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1288 | assert_return(s, NULL); |
eaa3cbef LP |
1289 | |
1290 | return s->event; | |
1291 | } | |
1292 | ||
f7262a9f | 1293 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1294 | assert_return(s, -EINVAL); |
6203e07a | 1295 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1296 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1297 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1298 | |
1299 | return s->pending; | |
1300 | } | |
1301 | ||
f7262a9f | 1302 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1303 | assert_return(s, -EINVAL); |
1304 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1305 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1306 | |
1307 | return s->io.fd; | |
1308 | } | |
1309 | ||
30caf8f3 LP |
1310 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1311 | int r; | |
1312 | ||
1313 | assert_return(s, -EINVAL); | |
8ac43fee | 1314 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1315 | assert_return(s->type == SOURCE_IO, -EDOM); |
1316 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1317 | ||
1318 | if (s->io.fd == fd) | |
1319 | return 0; | |
1320 | ||
1321 | if (s->enabled == SD_EVENT_OFF) { | |
1322 | s->io.fd = fd; | |
1323 | s->io.registered = false; | |
1324 | } else { | |
1325 | int saved_fd; | |
1326 | ||
1327 | saved_fd = s->io.fd; | |
1328 | assert(s->io.registered); | |
1329 | ||
1330 | s->io.fd = fd; | |
1331 | s->io.registered = false; | |
1332 | ||
1333 | r = source_io_register(s, s->enabled, s->io.events); | |
1334 | if (r < 0) { | |
1335 | s->io.fd = saved_fd; | |
1336 | s->io.registered = true; | |
1337 | return r; | |
1338 | } | |
1339 | ||
1340 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1341 | } | |
1342 | ||
1343 | return 0; | |
1344 | } | |
1345 | ||
f7262a9f | 1346 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1347 | assert_return(s, -EINVAL); |
1348 | assert_return(events, -EINVAL); | |
1349 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1350 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1351 | |
1352 | *events = s->io.events; | |
1353 | return 0; | |
1354 | } | |
1355 | ||
f7262a9f | 1356 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1357 | int r; |
1358 | ||
305f78bf LP |
1359 | assert_return(s, -EINVAL); |
1360 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1361 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1362 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1363 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1364 | |
b63c8d4f DH |
1365 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1366 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1367 | return 0; |
1368 | ||
baf76283 | 1369 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1370 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1371 | if (r < 0) |
1372 | return r; | |
1373 | } | |
1374 | ||
1375 | s->io.events = events; | |
503f39c3 | 1376 | source_set_pending(s, false); |
fd38203a LP |
1377 | |
1378 | return 0; | |
1379 | } | |
1380 | ||
f7262a9f | 1381 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1382 | assert_return(s, -EINVAL); |
1383 | assert_return(revents, -EINVAL); | |
1384 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1385 | assert_return(s->pending, -ENODATA); | |
1386 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1387 | |
1388 | *revents = s->io.revents; | |
1389 | return 0; | |
1390 | } | |
1391 | ||
f7262a9f | 1392 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1393 | assert_return(s, -EINVAL); |
1394 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1395 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1396 | |
1397 | return s->signal.sig; | |
1398 | } | |
1399 | ||
31927c16 | 1400 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1401 | assert_return(s, -EINVAL); |
1402 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1403 | |
1404 | return s->priority; | |
1405 | } | |
1406 | ||
31927c16 | 1407 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
305f78bf | 1408 | assert_return(s, -EINVAL); |
da7e457c | 1409 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1410 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1411 | |
1412 | if (s->priority == priority) | |
1413 | return 0; | |
1414 | ||
1415 | s->priority = priority; | |
1416 | ||
1417 | if (s->pending) | |
c2ba3ad6 | 1418 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1419 | |
1420 | if (s->prepare) | |
c2ba3ad6 | 1421 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1422 | |
6203e07a LP |
1423 | if (s->type == SOURCE_EXIT) |
1424 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1425 | |
fd38203a LP |
1426 | return 0; |
1427 | } | |
1428 | ||
f7262a9f | 1429 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1430 | assert_return(s, -EINVAL); |
1431 | assert_return(m, -EINVAL); | |
1432 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1433 | |
baf76283 | 1434 | *m = s->enabled; |
fd38203a LP |
1435 | return 0; |
1436 | } | |
1437 | ||
f7262a9f | 1438 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1439 | int r; |
1440 | ||
305f78bf LP |
1441 | assert_return(s, -EINVAL); |
1442 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
305f78bf | 1443 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1444 | |
cc567911 LP |
1445 | /* If we are dead anyway, we are fine with turning off |
1446 | * sources, but everything else needs to fail. */ | |
1447 | if (s->event->state == SD_EVENT_FINISHED) | |
1448 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1449 | ||
baf76283 | 1450 | if (s->enabled == m) |
fd38203a LP |
1451 | return 0; |
1452 | ||
baf76283 | 1453 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1454 | |
1455 | switch (s->type) { | |
1456 | ||
1457 | case SOURCE_IO: | |
366e6411 | 1458 | source_io_unregister(s); |
baf76283 | 1459 | s->enabled = m; |
fd38203a LP |
1460 | break; |
1461 | ||
6a0f1f6d | 1462 | case SOURCE_TIME_REALTIME: |
a8548816 | 1463 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1464 | case SOURCE_TIME_MONOTONIC: |
1465 | case SOURCE_TIME_REALTIME_ALARM: | |
1466 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1467 | struct clock_data *d; | |
fd38203a | 1468 | |
baf76283 | 1469 | s->enabled = m; |
6a0f1f6d LP |
1470 | d = event_get_clock_data(s->event, s->type); |
1471 | assert(d); | |
1472 | ||
1473 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1474 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1475 | d->needs_rearm = true; |
fd38203a | 1476 | break; |
6a0f1f6d | 1477 | } |
fd38203a LP |
1478 | |
1479 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1480 | assert(need_signal(s->event, s->signal.sig)); |
1481 | ||
baf76283 | 1482 | s->enabled = m; |
4807d2d0 ZJS |
1483 | |
1484 | if (!need_signal(s->event, s->signal.sig)) { | |
fd38203a | 1485 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
4807d2d0 ZJS |
1486 | |
1487 | (void) event_update_signal_fd(s->event); | |
1488 | /* If disabling failed, we might get a spurious event, | |
1489 | * but otherwise nothing bad should happen. */ | |
fd38203a LP |
1490 | } |
1491 | ||
1492 | break; | |
1493 | ||
1494 | case SOURCE_CHILD: | |
4807d2d0 ZJS |
1495 | assert(need_signal(s->event, SIGCHLD)); |
1496 | ||
baf76283 | 1497 | s->enabled = m; |
fd38203a | 1498 | |
baf76283 LP |
1499 | assert(s->event->n_enabled_child_sources > 0); |
1500 | s->event->n_enabled_child_sources--; | |
fd38203a | 1501 | |
4807d2d0 | 1502 | if (!need_signal(s->event, SIGCHLD)) { |
fd38203a | 1503 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); |
4807d2d0 ZJS |
1504 | |
1505 | (void) event_update_signal_fd(s->event); | |
fd38203a LP |
1506 | } |
1507 | ||
1508 | break; | |
1509 | ||
6203e07a | 1510 | case SOURCE_EXIT: |
305f78bf | 1511 | s->enabled = m; |
6203e07a | 1512 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1513 | break; |
1514 | ||
1515 | case SOURCE_DEFER: | |
6e9feda3 | 1516 | case SOURCE_POST: |
baf76283 | 1517 | s->enabled = m; |
fd38203a | 1518 | break; |
9d3e3aa5 | 1519 | |
6a0f1f6d | 1520 | default: |
9d3e3aa5 | 1521 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1522 | } |
1523 | ||
1524 | } else { | |
1525 | switch (s->type) { | |
1526 | ||
1527 | case SOURCE_IO: | |
1528 | r = source_io_register(s, m, s->io.events); | |
1529 | if (r < 0) | |
1530 | return r; | |
1531 | ||
baf76283 | 1532 | s->enabled = m; |
fd38203a LP |
1533 | break; |
1534 | ||
6a0f1f6d | 1535 | case SOURCE_TIME_REALTIME: |
a8548816 | 1536 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1537 | case SOURCE_TIME_MONOTONIC: |
1538 | case SOURCE_TIME_REALTIME_ALARM: | |
1539 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1540 | struct clock_data *d; | |
fd38203a | 1541 | |
baf76283 | 1542 | s->enabled = m; |
6a0f1f6d LP |
1543 | d = event_get_clock_data(s->event, s->type); |
1544 | assert(d); | |
1545 | ||
1546 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1547 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1548 | d->needs_rearm = true; |
fd38203a | 1549 | break; |
6a0f1f6d | 1550 | } |
fd38203a LP |
1551 | |
1552 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1553 | /* Check status before enabling. */ |
1554 | if (!need_signal(s->event, s->signal.sig)) { | |
fd38203a | 1555 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
4807d2d0 ZJS |
1556 | |
1557 | r = event_update_signal_fd(s->event); | |
1558 | if (r < 0) { | |
1559 | s->enabled = SD_EVENT_OFF; | |
1560 | return r; | |
1561 | } | |
fd38203a | 1562 | } |
4807d2d0 ZJS |
1563 | |
1564 | s->enabled = m; | |
fd38203a LP |
1565 | break; |
1566 | ||
1567 | case SOURCE_CHILD: | |
4807d2d0 | 1568 | /* Check status before enabling. */ |
baf76283 | 1569 | if (s->enabled == SD_EVENT_OFF) { |
4807d2d0 ZJS |
1570 | if (!need_signal(s->event, SIGCHLD)) { |
1571 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); | |
1572 | ||
1573 | r = event_update_signal_fd(s->event); | |
1574 | if (r < 0) { | |
1575 | s->enabled = SD_EVENT_OFF; | |
1576 | return r; | |
1577 | } | |
fd38203a | 1578 | } |
4807d2d0 ZJS |
1579 | |
1580 | s->event->n_enabled_child_sources++; | |
fd38203a | 1581 | } |
7a0d4a3d DH |
1582 | |
1583 | s->enabled = m; | |
fd38203a LP |
1584 | break; |
1585 | ||
6203e07a | 1586 | case SOURCE_EXIT: |
305f78bf | 1587 | s->enabled = m; |
6203e07a | 1588 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1589 | break; |
1590 | ||
1591 | case SOURCE_DEFER: | |
6e9feda3 | 1592 | case SOURCE_POST: |
baf76283 | 1593 | s->enabled = m; |
fd38203a | 1594 | break; |
9d3e3aa5 | 1595 | |
6a0f1f6d | 1596 | default: |
9d3e3aa5 | 1597 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1598 | } |
1599 | } | |
1600 | ||
1601 | if (s->pending) | |
1602 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1603 | ||
1604 | if (s->prepare) | |
1605 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1606 | ||
1607 | return 0; | |
1608 | } | |
1609 | ||
f7262a9f | 1610 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1611 | assert_return(s, -EINVAL); |
1612 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1613 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1614 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1615 | |
1616 | *usec = s->time.next; | |
1617 | return 0; | |
1618 | } | |
1619 | ||
f7262a9f | 1620 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1621 | struct clock_data *d; |
1622 | ||
305f78bf LP |
1623 | assert_return(s, -EINVAL); |
1624 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1625 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1626 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1627 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1628 | |
fd38203a | 1629 | s->time.next = usec; |
2576a19e | 1630 | |
0cc1125a | 1631 | source_set_pending(s, false); |
fd38203a | 1632 | |
6a0f1f6d LP |
1633 | d = event_get_clock_data(s->event, s->type); |
1634 | assert(d); | |
1635 | ||
1636 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1637 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1638 | d->needs_rearm = true; |
fd38203a LP |
1639 | |
1640 | return 0; | |
1641 | } | |
1642 | ||
f7262a9f | 1643 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1644 | assert_return(s, -EINVAL); |
1645 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1646 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1647 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1648 | ||
1649 | *usec = s->time.accuracy; | |
1650 | return 0; | |
1651 | } | |
1652 | ||
f7262a9f | 1653 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1654 | struct clock_data *d; |
1655 | ||
305f78bf LP |
1656 | assert_return(s, -EINVAL); |
1657 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1658 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1659 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1660 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1661 | |
1662 | if (usec == 0) | |
1663 | usec = DEFAULT_ACCURACY_USEC; | |
1664 | ||
eaa3cbef LP |
1665 | s->time.accuracy = usec; |
1666 | ||
2576a19e LP |
1667 | source_set_pending(s, false); |
1668 | ||
6a0f1f6d LP |
1669 | d = event_get_clock_data(s->event, s->type); |
1670 | assert(d); | |
1671 | ||
1672 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1673 | d->needs_rearm = true; |
6a0f1f6d LP |
1674 | |
1675 | return 0; | |
1676 | } | |
1677 | ||
1678 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1679 | assert_return(s, -EINVAL); | |
1680 | assert_return(clock, -EINVAL); | |
1681 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1682 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1683 | |
6a0f1f6d | 1684 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1685 | return 0; |
1686 | } | |
1687 | ||
f7262a9f | 1688 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1689 | assert_return(s, -EINVAL); |
1690 | assert_return(pid, -EINVAL); | |
1691 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1692 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1693 | ||
1694 | *pid = s->child.pid; | |
1695 | return 0; | |
1696 | } | |
1697 | ||
718db961 | 1698 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1699 | int r; |
1700 | ||
da7e457c | 1701 | assert_return(s, -EINVAL); |
6203e07a | 1702 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1703 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1704 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1705 | |
1706 | if (s->prepare == callback) | |
1707 | return 0; | |
1708 | ||
1709 | if (callback && s->prepare) { | |
1710 | s->prepare = callback; | |
1711 | return 0; | |
1712 | } | |
1713 | ||
1714 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1715 | if (r < 0) | |
1716 | return r; | |
1717 | ||
1718 | s->prepare = callback; | |
1719 | ||
1720 | if (callback) { | |
1721 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1722 | if (r < 0) | |
1723 | return r; | |
1724 | } else | |
1725 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1726 | ||
1727 | return 0; | |
1728 | } | |
1729 | ||
f7262a9f | 1730 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1731 | assert_return(s, NULL); |
fd38203a LP |
1732 | |
1733 | return s->userdata; | |
1734 | } | |
1735 | ||
8f726607 LP |
1736 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1737 | void *ret; | |
1738 | ||
1739 | assert_return(s, NULL); | |
1740 | ||
1741 | ret = s->userdata; | |
1742 | s->userdata = userdata; | |
1743 | ||
1744 | return ret; | |
1745 | } | |
1746 | ||
c2ba3ad6 LP |
1747 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1748 | usec_t c; | |
1749 | assert(e); | |
1750 | assert(a <= b); | |
1751 | ||
1752 | if (a <= 0) | |
1753 | return 0; | |
1754 | ||
1755 | if (b <= a + 1) | |
1756 | return a; | |
1757 | ||
52444dc4 LP |
1758 | initialize_perturb(e); |
1759 | ||
c2ba3ad6 LP |
1760 | /* |
1761 | Find a good time to wake up again between times a and b. We | |
1762 | have two goals here: | |
1763 | ||
1764 | a) We want to wake up as seldom as possible, hence prefer | |
1765 | later times over earlier times. | |
1766 | ||
1767 | b) But if we have to wake up, then let's make sure to | |
1768 | dispatch as much as possible on the entire system. | |
1769 | ||
1770 | We implement this by waking up everywhere at the same time | |
850516e0 | 1771 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1772 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1773 | then we try to find the same spot in every 10s, then 1s and |
1774 | then 250ms step. Otherwise, we pick the last possible time | |
1775 | to wake up. | |
c2ba3ad6 LP |
1776 | */ |
1777 | ||
850516e0 LP |
1778 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1779 | if (c >= b) { | |
1780 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1781 | return b; | |
1782 | ||
1783 | c -= USEC_PER_MINUTE; | |
1784 | } | |
1785 | ||
ba276c81 LP |
1786 | if (c >= a) |
1787 | return c; | |
1788 | ||
1789 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1790 | if (c >= b) { | |
1791 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1792 | return b; | |
1793 | ||
1794 | c -= USEC_PER_SEC*10; | |
1795 | } | |
1796 | ||
850516e0 LP |
1797 | if (c >= a) |
1798 | return c; | |
1799 | ||
1800 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1801 | if (c >= b) { |
1802 | if (_unlikely_(c < USEC_PER_SEC)) | |
1803 | return b; | |
1804 | ||
1805 | c -= USEC_PER_SEC; | |
1806 | } | |
1807 | ||
1808 | if (c >= a) | |
1809 | return c; | |
1810 | ||
1811 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1812 | if (c >= b) { | |
1813 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1814 | return b; | |
1815 | ||
1816 | c -= USEC_PER_MSEC*250; | |
1817 | } | |
1818 | ||
1819 | if (c >= a) | |
1820 | return c; | |
1821 | ||
1822 | return b; | |
1823 | } | |
1824 | ||
fd38203a LP |
1825 | static int event_arm_timer( |
1826 | sd_event *e, | |
6a0f1f6d | 1827 | struct clock_data *d) { |
fd38203a LP |
1828 | |
1829 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1830 | sd_event_source *a, *b; |
1831 | usec_t t; | |
fd38203a LP |
1832 | int r; |
1833 | ||
cde93897 | 1834 | assert(e); |
6a0f1f6d | 1835 | assert(d); |
fd38203a | 1836 | |
d06441da | 1837 | if (!d->needs_rearm) |
212bbb17 TG |
1838 | return 0; |
1839 | else | |
1840 | d->needs_rearm = false; | |
1841 | ||
6a0f1f6d | 1842 | a = prioq_peek(d->earliest); |
72aedc1e LP |
1843 | if (!a || a->enabled == SD_EVENT_OFF) { |
1844 | ||
6a0f1f6d | 1845 | if (d->fd < 0) |
c57b5ca3 LP |
1846 | return 0; |
1847 | ||
3a43da28 | 1848 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
1849 | return 0; |
1850 | ||
1851 | /* disarm */ | |
6a0f1f6d | 1852 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1853 | if (r < 0) |
1854 | return r; | |
1855 | ||
3a43da28 | 1856 | d->next = USEC_INFINITY; |
fd38203a | 1857 | return 0; |
72aedc1e | 1858 | } |
fd38203a | 1859 | |
6a0f1f6d | 1860 | b = prioq_peek(d->latest); |
baf76283 | 1861 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1862 | |
1863 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
6a0f1f6d | 1864 | if (d->next == t) |
fd38203a LP |
1865 | return 0; |
1866 | ||
6a0f1f6d | 1867 | assert_se(d->fd >= 0); |
fd38203a | 1868 | |
c2ba3ad6 | 1869 | if (t == 0) { |
fd38203a LP |
1870 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1871 | its.it_value.tv_sec = 0; | |
1872 | its.it_value.tv_nsec = 1; | |
1873 | } else | |
c2ba3ad6 | 1874 | timespec_store(&its.it_value, t); |
fd38203a | 1875 | |
6a0f1f6d | 1876 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 1877 | if (r < 0) |
cde93897 | 1878 | return -errno; |
fd38203a | 1879 | |
6a0f1f6d | 1880 | d->next = t; |
fd38203a LP |
1881 | return 0; |
1882 | } | |
1883 | ||
9a800b56 | 1884 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
1885 | assert(e); |
1886 | assert(s); | |
1887 | assert(s->type == SOURCE_IO); | |
1888 | ||
9a800b56 LP |
1889 | /* If the event source was already pending, we just OR in the |
1890 | * new revents, otherwise we reset the value. The ORing is | |
1891 | * necessary to handle EPOLLONESHOT events properly where | |
1892 | * readability might happen independently of writability, and | |
1893 | * we need to keep track of both */ | |
1894 | ||
1895 | if (s->pending) | |
1896 | s->io.revents |= revents; | |
1897 | else | |
1898 | s->io.revents = revents; | |
fd38203a | 1899 | |
fd38203a LP |
1900 | return source_set_pending(s, true); |
1901 | } | |
1902 | ||
72aedc1e | 1903 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
1904 | uint64_t x; |
1905 | ssize_t ss; | |
1906 | ||
1907 | assert(e); | |
da7e457c | 1908 | assert(fd >= 0); |
72aedc1e | 1909 | |
305f78bf | 1910 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1911 | |
1912 | ss = read(fd, &x, sizeof(x)); | |
1913 | if (ss < 0) { | |
1914 | if (errno == EAGAIN || errno == EINTR) | |
1915 | return 0; | |
1916 | ||
1917 | return -errno; | |
1918 | } | |
1919 | ||
8d35dae7 | 1920 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
1921 | return -EIO; |
1922 | ||
cde93897 | 1923 | if (next) |
3a43da28 | 1924 | *next = USEC_INFINITY; |
72aedc1e | 1925 | |
fd38203a LP |
1926 | return 0; |
1927 | } | |
1928 | ||
305f78bf LP |
1929 | static int process_timer( |
1930 | sd_event *e, | |
1931 | usec_t n, | |
6a0f1f6d | 1932 | struct clock_data *d) { |
305f78bf | 1933 | |
fd38203a LP |
1934 | sd_event_source *s; |
1935 | int r; | |
1936 | ||
1937 | assert(e); | |
6a0f1f6d | 1938 | assert(d); |
fd38203a LP |
1939 | |
1940 | for (;;) { | |
6a0f1f6d | 1941 | s = prioq_peek(d->earliest); |
fd38203a LP |
1942 | if (!s || |
1943 | s->time.next > n || | |
baf76283 | 1944 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1945 | s->pending) |
1946 | break; | |
1947 | ||
1948 | r = source_set_pending(s, true); | |
1949 | if (r < 0) | |
1950 | return r; | |
1951 | ||
6a0f1f6d LP |
1952 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
1953 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 1954 | d->needs_rearm = true; |
fd38203a LP |
1955 | } |
1956 | ||
1957 | return 0; | |
1958 | } | |
1959 | ||
1960 | static int process_child(sd_event *e) { | |
1961 | sd_event_source *s; | |
1962 | Iterator i; | |
1963 | int r; | |
1964 | ||
1965 | assert(e); | |
1966 | ||
c2ba3ad6 LP |
1967 | e->need_process_child = false; |
1968 | ||
fd38203a LP |
1969 | /* |
1970 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1971 | + WNOHANG for each PID we wait for, instead of using | |
1972 | P_ALL. This is because we only want to get child | |
1973 | information of very specific child processes, and not all | |
1974 | of them. We might not have processed the SIGCHLD even of a | |
1975 | previous invocation and we don't want to maintain a | |
1976 | unbounded *per-child* event queue, hence we really don't | |
1977 | want anything flushed out of the kernel's queue that we | |
1978 | don't care about. Since this is O(n) this means that if you | |
1979 | have a lot of processes you probably want to handle SIGCHLD | |
1980 | yourself. | |
08cd1552 LP |
1981 | |
1982 | We do not reap the children here (by using WNOWAIT), this | |
1983 | is only done after the event source is dispatched so that | |
1984 | the callback still sees the process as a zombie. | |
fd38203a LP |
1985 | */ |
1986 | ||
1987 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1988 | assert(s->type == SOURCE_CHILD); | |
1989 | ||
1990 | if (s->pending) | |
1991 | continue; | |
1992 | ||
baf76283 | 1993 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1994 | continue; |
1995 | ||
1996 | zero(s->child.siginfo); | |
08cd1552 LP |
1997 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
1998 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
1999 | if (r < 0) |
2000 | return -errno; | |
2001 | ||
2002 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
2003 | bool zombie = |
2004 | s->child.siginfo.si_code == CLD_EXITED || | |
2005 | s->child.siginfo.si_code == CLD_KILLED || | |
2006 | s->child.siginfo.si_code == CLD_DUMPED; | |
2007 | ||
2008 | if (!zombie && (s->child.options & WEXITED)) { | |
2009 | /* If the child isn't dead then let's | |
2010 | * immediately remove the state change | |
2011 | * from the queue, since there's no | |
2012 | * benefit in leaving it queued */ | |
2013 | ||
2014 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2015 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2016 | } | |
2017 | ||
fd38203a LP |
2018 | r = source_set_pending(s, true); |
2019 | if (r < 0) | |
2020 | return r; | |
2021 | } | |
2022 | } | |
2023 | ||
fd38203a LP |
2024 | return 0; |
2025 | } | |
2026 | ||
2027 | static int process_signal(sd_event *e, uint32_t events) { | |
fd38203a | 2028 | bool read_one = false; |
fd38203a LP |
2029 | int r; |
2030 | ||
da7e457c | 2031 | assert(e); |
0eb2e0e3 | 2032 | |
305f78bf | 2033 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2034 | |
2035 | for (;;) { | |
0eb2e0e3 | 2036 | struct signalfd_siginfo si; |
7057bd99 | 2037 | ssize_t n; |
92daebc0 | 2038 | sd_event_source *s = NULL; |
fd38203a | 2039 | |
7057bd99 ZJS |
2040 | n = read(e->signal_fd, &si, sizeof(si)); |
2041 | if (n < 0) { | |
fd38203a LP |
2042 | if (errno == EAGAIN || errno == EINTR) |
2043 | return read_one; | |
2044 | ||
2045 | return -errno; | |
2046 | } | |
2047 | ||
7057bd99 | 2048 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2049 | return -EIO; |
2050 | ||
7057bd99 ZJS |
2051 | assert(si.ssi_signo < _NSIG); |
2052 | ||
fd38203a LP |
2053 | read_one = true; |
2054 | ||
2055 | if (si.ssi_signo == SIGCHLD) { | |
2056 | r = process_child(e); | |
2057 | if (r < 0) | |
2058 | return r; | |
92daebc0 | 2059 | if (r > 0) |
fd38203a | 2060 | continue; |
92daebc0 LP |
2061 | } |
2062 | ||
2063 | if (e->signal_sources) | |
2064 | s = e->signal_sources[si.ssi_signo]; | |
2065 | ||
2066 | if (!s) | |
2067 | continue; | |
fd38203a LP |
2068 | |
2069 | s->signal.siginfo = si; | |
2070 | r = source_set_pending(s, true); | |
2071 | if (r < 0) | |
2072 | return r; | |
2073 | } | |
fd38203a LP |
2074 | } |
2075 | ||
2076 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 2077 | int r = 0; |
fd38203a LP |
2078 | |
2079 | assert(s); | |
6203e07a | 2080 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2081 | |
6203e07a | 2082 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
2083 | r = source_set_pending(s, false); |
2084 | if (r < 0) | |
2085 | return r; | |
2086 | } | |
fd38203a | 2087 | |
6e9feda3 LP |
2088 | if (s->type != SOURCE_POST) { |
2089 | sd_event_source *z; | |
2090 | Iterator i; | |
2091 | ||
2092 | /* If we execute a non-post source, let's mark all | |
2093 | * post sources as pending */ | |
2094 | ||
2095 | SET_FOREACH(z, s->event->post_sources, i) { | |
2096 | if (z->enabled == SD_EVENT_OFF) | |
2097 | continue; | |
2098 | ||
2099 | r = source_set_pending(z, true); | |
2100 | if (r < 0) | |
2101 | return r; | |
2102 | } | |
2103 | } | |
2104 | ||
baf76283 LP |
2105 | if (s->enabled == SD_EVENT_ONESHOT) { |
2106 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2107 | if (r < 0) |
2108 | return r; | |
2109 | } | |
2110 | ||
12179984 | 2111 | s->dispatching = true; |
b7484e2a | 2112 | |
fd38203a LP |
2113 | switch (s->type) { |
2114 | ||
2115 | case SOURCE_IO: | |
2116 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2117 | break; | |
2118 | ||
6a0f1f6d | 2119 | case SOURCE_TIME_REALTIME: |
a8548816 | 2120 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2121 | case SOURCE_TIME_MONOTONIC: |
2122 | case SOURCE_TIME_REALTIME_ALARM: | |
2123 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2124 | r = s->time.callback(s, s->time.next, s->userdata); |
2125 | break; | |
2126 | ||
2127 | case SOURCE_SIGNAL: | |
2128 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2129 | break; | |
2130 | ||
08cd1552 LP |
2131 | case SOURCE_CHILD: { |
2132 | bool zombie; | |
2133 | ||
2134 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
2135 | s->child.siginfo.si_code == CLD_KILLED || | |
2136 | s->child.siginfo.si_code == CLD_DUMPED; | |
2137 | ||
fd38203a | 2138 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2139 | |
2140 | /* Now, reap the PID for good. */ | |
2141 | if (zombie) | |
2142 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2143 | ||
fd38203a | 2144 | break; |
08cd1552 | 2145 | } |
fd38203a LP |
2146 | |
2147 | case SOURCE_DEFER: | |
2148 | r = s->defer.callback(s, s->userdata); | |
2149 | break; | |
da7e457c | 2150 | |
6e9feda3 LP |
2151 | case SOURCE_POST: |
2152 | r = s->post.callback(s, s->userdata); | |
2153 | break; | |
2154 | ||
6203e07a LP |
2155 | case SOURCE_EXIT: |
2156 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2157 | break; |
9d3e3aa5 LP |
2158 | |
2159 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2160 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2161 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2162 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2163 | } |
2164 | ||
12179984 LP |
2165 | s->dispatching = false; |
2166 | ||
752bbf75 | 2167 | if (r < 0) { |
356779df | 2168 | if (s->description) |
da927ba9 | 2169 | log_debug_errno(r, "Event source '%s' returned error, disabling: %m", s->description); |
752bbf75 | 2170 | else |
da927ba9 | 2171 | log_debug_errno(r, "Event source %p returned error, disabling: %m", s); |
752bbf75 | 2172 | } |
12179984 LP |
2173 | |
2174 | if (s->n_ref == 0) | |
2175 | source_free(s); | |
2176 | else if (r < 0) | |
6203e07a | 2177 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2178 | |
6203e07a | 2179 | return 1; |
fd38203a LP |
2180 | } |
2181 | ||
2182 | static int event_prepare(sd_event *e) { | |
2183 | int r; | |
2184 | ||
2185 | assert(e); | |
2186 | ||
2187 | for (;;) { | |
2188 | sd_event_source *s; | |
2189 | ||
2190 | s = prioq_peek(e->prepare); | |
baf76283 | 2191 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2192 | break; |
2193 | ||
2194 | s->prepare_iteration = e->iteration; | |
2195 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2196 | if (r < 0) | |
2197 | return r; | |
2198 | ||
2199 | assert(s->prepare); | |
12179984 LP |
2200 | |
2201 | s->dispatching = true; | |
fd38203a | 2202 | r = s->prepare(s, s->userdata); |
12179984 LP |
2203 | s->dispatching = false; |
2204 | ||
752bbf75 | 2205 | if (r < 0) { |
356779df | 2206 | if (s->description) |
da927ba9 | 2207 | log_debug_errno(r, "Prepare callback of event source '%s' returned error, disabling: %m", s->description); |
752bbf75 | 2208 | else |
da927ba9 | 2209 | log_debug_errno(r, "Prepare callback of event source %p returned error, disabling: %m", s); |
752bbf75 | 2210 | } |
fd38203a | 2211 | |
12179984 LP |
2212 | if (s->n_ref == 0) |
2213 | source_free(s); | |
2214 | else if (r < 0) | |
2215 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2216 | } |
2217 | ||
2218 | return 0; | |
2219 | } | |
2220 | ||
6203e07a | 2221 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2222 | sd_event_source *p; |
2223 | int r; | |
2224 | ||
2225 | assert(e); | |
2226 | ||
6203e07a | 2227 | p = prioq_peek(e->exit); |
baf76283 | 2228 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2229 | e->state = SD_EVENT_FINISHED; |
2230 | return 0; | |
2231 | } | |
2232 | ||
2233 | sd_event_ref(e); | |
2234 | e->iteration++; | |
6203e07a | 2235 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2236 | |
2237 | r = source_dispatch(p); | |
2238 | ||
2b0c9ef7 | 2239 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2240 | sd_event_unref(e); |
2241 | ||
2242 | return r; | |
2243 | } | |
2244 | ||
c2ba3ad6 LP |
2245 | static sd_event_source* event_next_pending(sd_event *e) { |
2246 | sd_event_source *p; | |
2247 | ||
da7e457c LP |
2248 | assert(e); |
2249 | ||
c2ba3ad6 LP |
2250 | p = prioq_peek(e->pending); |
2251 | if (!p) | |
2252 | return NULL; | |
2253 | ||
baf76283 | 2254 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2255 | return NULL; |
2256 | ||
2257 | return p; | |
2258 | } | |
2259 | ||
cde93897 LP |
2260 | static int arm_watchdog(sd_event *e) { |
2261 | struct itimerspec its = {}; | |
2262 | usec_t t; | |
2263 | int r; | |
2264 | ||
2265 | assert(e); | |
2266 | assert(e->watchdog_fd >= 0); | |
2267 | ||
2268 | t = sleep_between(e, | |
2269 | e->watchdog_last + (e->watchdog_period / 2), | |
2270 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2271 | ||
2272 | timespec_store(&its.it_value, t); | |
2273 | ||
75145780 LP |
2274 | /* Make sure we never set the watchdog to 0, which tells the |
2275 | * kernel to disable it. */ | |
2276 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2277 | its.it_value.tv_nsec = 1; | |
2278 | ||
cde93897 LP |
2279 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2280 | if (r < 0) | |
2281 | return -errno; | |
2282 | ||
2283 | return 0; | |
2284 | } | |
2285 | ||
2286 | static int process_watchdog(sd_event *e) { | |
2287 | assert(e); | |
2288 | ||
2289 | if (!e->watchdog) | |
2290 | return 0; | |
2291 | ||
2292 | /* Don't notify watchdog too often */ | |
2293 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2294 | return 0; | |
2295 | ||
2296 | sd_notify(false, "WATCHDOG=1"); | |
2297 | e->watchdog_last = e->timestamp.monotonic; | |
2298 | ||
2299 | return arm_watchdog(e); | |
2300 | } | |
2301 | ||
c45a5a74 TG |
2302 | _public_ int sd_event_prepare(sd_event *e) { |
2303 | int r; | |
fd38203a | 2304 | |
da7e457c LP |
2305 | assert_return(e, -EINVAL); |
2306 | assert_return(!event_pid_changed(e), -ECHILD); | |
2307 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2308 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 2309 | |
6203e07a | 2310 | if (e->exit_requested) |
c45a5a74 | 2311 | goto pending; |
fd38203a LP |
2312 | |
2313 | e->iteration++; | |
2314 | ||
2315 | r = event_prepare(e); | |
2316 | if (r < 0) | |
c45a5a74 | 2317 | return r; |
fd38203a | 2318 | |
6a0f1f6d LP |
2319 | r = event_arm_timer(e, &e->realtime); |
2320 | if (r < 0) | |
c45a5a74 | 2321 | return r; |
6a0f1f6d | 2322 | |
a8548816 TG |
2323 | r = event_arm_timer(e, &e->boottime); |
2324 | if (r < 0) | |
c45a5a74 | 2325 | return r; |
a8548816 | 2326 | |
6a0f1f6d LP |
2327 | r = event_arm_timer(e, &e->monotonic); |
2328 | if (r < 0) | |
c45a5a74 | 2329 | return r; |
6a0f1f6d LP |
2330 | |
2331 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 2332 | if (r < 0) |
c45a5a74 | 2333 | return r; |
fd38203a | 2334 | |
6a0f1f6d | 2335 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 2336 | if (r < 0) |
c45a5a74 | 2337 | return r; |
fd38203a | 2338 | |
1b5995b0 | 2339 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
2340 | goto pending; |
2341 | ||
2b0c9ef7 | 2342 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
2343 | |
2344 | return 0; | |
2345 | ||
2346 | pending: | |
2b0c9ef7 | 2347 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2348 | r = sd_event_wait(e, 0); |
2349 | if (r == 0) | |
2b0c9ef7 | 2350 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2351 | |
2352 | return r; | |
c45a5a74 TG |
2353 | } |
2354 | ||
2355 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2356 | struct epoll_event *ev_queue; | |
2357 | unsigned ev_queue_max; | |
2358 | int r, m, i; | |
2359 | ||
2360 | assert_return(e, -EINVAL); | |
2361 | assert_return(!event_pid_changed(e), -ECHILD); | |
2362 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2363 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
2364 | |
2365 | if (e->exit_requested) { | |
2366 | e->state = SD_EVENT_PENDING; | |
2367 | return 1; | |
2368 | } | |
6a0f1f6d | 2369 | |
1c724e9e | 2370 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 2371 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 2372 | |
15b38f93 | 2373 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2374 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2375 | if (m < 0) { |
c45a5a74 TG |
2376 | if (errno == EINTR) { |
2377 | e->state = SD_EVENT_PENDING; | |
2378 | return 1; | |
2379 | } | |
2380 | ||
2381 | r = -errno; | |
da7e457c LP |
2382 | goto finish; |
2383 | } | |
fd38203a | 2384 | |
46e8c825 | 2385 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2386 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2387 | |
2388 | for (i = 0; i < m; i++) { | |
2389 | ||
6a0f1f6d LP |
2390 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME)) |
2391 | r = flush_timer(e, e->realtime.fd, ev_queue[i].events, &e->realtime.next); | |
a8548816 TG |
2392 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_BOOTTIME)) |
2393 | r = flush_timer(e, e->boottime.fd, ev_queue[i].events, &e->boottime.next); | |
6a0f1f6d LP |
2394 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_MONOTONIC)) |
2395 | r = flush_timer(e, e->monotonic.fd, ev_queue[i].events, &e->monotonic.next); | |
2396 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME_ALARM)) | |
2397 | r = flush_timer(e, e->realtime_alarm.fd, ev_queue[i].events, &e->realtime_alarm.next); | |
2398 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_BOOTTIME_ALARM)) | |
2399 | r = flush_timer(e, e->boottime_alarm.fd, ev_queue[i].events, &e->boottime_alarm.next); | |
fd38203a LP |
2400 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) |
2401 | r = process_signal(e, ev_queue[i].events); | |
79e16ce3 | 2402 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2403 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
fd38203a LP |
2404 | else |
2405 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2406 | ||
2407 | if (r < 0) | |
da7e457c | 2408 | goto finish; |
fd38203a LP |
2409 | } |
2410 | ||
cde93897 LP |
2411 | r = process_watchdog(e); |
2412 | if (r < 0) | |
2413 | goto finish; | |
2414 | ||
6a0f1f6d LP |
2415 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2416 | if (r < 0) | |
2417 | goto finish; | |
2418 | ||
a8548816 TG |
2419 | r = process_timer(e, e->timestamp_boottime, &e->boottime); |
2420 | if (r < 0) | |
2421 | goto finish; | |
2422 | ||
6a0f1f6d LP |
2423 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2424 | if (r < 0) | |
2425 | goto finish; | |
2426 | ||
2427 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2428 | if (r < 0) |
da7e457c | 2429 | goto finish; |
fd38203a | 2430 | |
6a0f1f6d | 2431 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2432 | if (r < 0) |
da7e457c | 2433 | goto finish; |
fd38203a | 2434 | |
c2ba3ad6 | 2435 | if (e->need_process_child) { |
fd38203a LP |
2436 | r = process_child(e); |
2437 | if (r < 0) | |
da7e457c | 2438 | goto finish; |
fd38203a LP |
2439 | } |
2440 | ||
c45a5a74 TG |
2441 | if (event_next_pending(e)) { |
2442 | e->state = SD_EVENT_PENDING; | |
2443 | ||
2444 | return 1; | |
da7e457c LP |
2445 | } |
2446 | ||
c45a5a74 | 2447 | r = 0; |
fd38203a | 2448 | |
da7e457c | 2449 | finish: |
2b0c9ef7 | 2450 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2451 | |
2452 | return r; | |
fd38203a LP |
2453 | } |
2454 | ||
c45a5a74 TG |
2455 | _public_ int sd_event_dispatch(sd_event *e) { |
2456 | sd_event_source *p; | |
2457 | int r; | |
2458 | ||
2459 | assert_return(e, -EINVAL); | |
2460 | assert_return(!event_pid_changed(e), -ECHILD); | |
2461 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2462 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
2463 | ||
2464 | if (e->exit_requested) | |
2465 | return dispatch_exit(e); | |
2466 | ||
2467 | p = event_next_pending(e); | |
2468 | if (p) { | |
2469 | sd_event_ref(e); | |
2470 | ||
2471 | e->state = SD_EVENT_RUNNING; | |
2472 | r = source_dispatch(p); | |
2b0c9ef7 | 2473 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2474 | |
2475 | sd_event_unref(e); | |
2476 | ||
2477 | return r; | |
2478 | } | |
2479 | ||
2b0c9ef7 | 2480 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2481 | |
2482 | return 1; | |
2483 | } | |
2484 | ||
2485 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { | |
2486 | int r; | |
2487 | ||
2488 | assert_return(e, -EINVAL); | |
2489 | assert_return(!event_pid_changed(e), -ECHILD); | |
2490 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2491 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 TG |
2492 | |
2493 | r = sd_event_prepare(e); | |
53bac4e0 LP |
2494 | if (r == 0) |
2495 | /* There was nothing? Then wait... */ | |
2496 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 2497 | |
02d30981 | 2498 | if (r > 0) { |
53bac4e0 | 2499 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
2500 | r = sd_event_dispatch(e); |
2501 | if (r < 0) | |
2502 | return r; | |
53bac4e0 LP |
2503 | |
2504 | return 1; | |
2505 | } | |
2506 | ||
2507 | return r; | |
c45a5a74 TG |
2508 | } |
2509 | ||
f7262a9f | 2510 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2511 | int r; |
2512 | ||
da7e457c LP |
2513 | assert_return(e, -EINVAL); |
2514 | assert_return(!event_pid_changed(e), -ECHILD); | |
2b0c9ef7 | 2515 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c LP |
2516 | |
2517 | sd_event_ref(e); | |
fd38203a | 2518 | |
da7e457c | 2519 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2520 | r = sd_event_run(e, (uint64_t) -1); |
2521 | if (r < 0) | |
da7e457c | 2522 | goto finish; |
fd38203a LP |
2523 | } |
2524 | ||
6203e07a | 2525 | r = e->exit_code; |
da7e457c LP |
2526 | |
2527 | finish: | |
2528 | sd_event_unref(e); | |
2529 | return r; | |
fd38203a LP |
2530 | } |
2531 | ||
9b364545 TG |
2532 | _public_ int sd_event_get_fd(sd_event *e) { |
2533 | ||
2534 | assert_return(e, -EINVAL); | |
2535 | assert_return(!event_pid_changed(e), -ECHILD); | |
2536 | ||
2537 | return e->epoll_fd; | |
2538 | } | |
2539 | ||
f7262a9f | 2540 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2541 | assert_return(e, -EINVAL); |
2542 | assert_return(!event_pid_changed(e), -ECHILD); | |
2543 | ||
2544 | return e->state; | |
2545 | } | |
2546 | ||
6203e07a | 2547 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2548 | assert_return(e, -EINVAL); |
6203e07a | 2549 | assert_return(code, -EINVAL); |
da7e457c | 2550 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2551 | |
6203e07a LP |
2552 | if (!e->exit_requested) |
2553 | return -ENODATA; | |
2554 | ||
2555 | *code = e->exit_code; | |
2556 | return 0; | |
fd38203a LP |
2557 | } |
2558 | ||
6203e07a | 2559 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2560 | assert_return(e, -EINVAL); |
2561 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2562 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2563 | |
6203e07a LP |
2564 | e->exit_requested = true; |
2565 | e->exit_code = code; | |
2566 | ||
fd38203a LP |
2567 | return 0; |
2568 | } | |
46e8c825 | 2569 | |
6a0f1f6d | 2570 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2571 | assert_return(e, -EINVAL); |
2572 | assert_return(usec, -EINVAL); | |
46e8c825 LP |
2573 | assert_return(!event_pid_changed(e), -ECHILD); |
2574 | ||
38a03f06 LP |
2575 | if (!dual_timestamp_is_set(&e->timestamp)) { |
2576 | /* Implicitly fall back to now() if we never ran | |
2577 | * before and thus have no cached time. */ | |
2578 | *usec = now(clock); | |
2579 | return 1; | |
2580 | } | |
46e8c825 | 2581 | |
6a0f1f6d LP |
2582 | switch (clock) { |
2583 | ||
2584 | case CLOCK_REALTIME: | |
2585 | case CLOCK_REALTIME_ALARM: | |
2586 | *usec = e->timestamp.realtime; | |
2587 | break; | |
2588 | ||
2589 | case CLOCK_MONOTONIC: | |
2590 | *usec = e->timestamp.monotonic; | |
2591 | break; | |
2592 | ||
a8548816 | 2593 | case CLOCK_BOOTTIME: |
6a0f1f6d LP |
2594 | case CLOCK_BOOTTIME_ALARM: |
2595 | *usec = e->timestamp_boottime; | |
2596 | break; | |
2597 | } | |
46e8c825 | 2598 | |
46e8c825 LP |
2599 | return 0; |
2600 | } | |
afc6adb5 LP |
2601 | |
2602 | _public_ int sd_event_default(sd_event **ret) { | |
2603 | ||
ec202eae | 2604 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2605 | sd_event *e = NULL; |
afc6adb5 LP |
2606 | int r; |
2607 | ||
2608 | if (!ret) | |
2609 | return !!default_event; | |
2610 | ||
2611 | if (default_event) { | |
2612 | *ret = sd_event_ref(default_event); | |
2613 | return 0; | |
2614 | } | |
2615 | ||
2616 | r = sd_event_new(&e); | |
2617 | if (r < 0) | |
2618 | return r; | |
2619 | ||
2620 | e->default_event_ptr = &default_event; | |
2621 | e->tid = gettid(); | |
2622 | default_event = e; | |
2623 | ||
2624 | *ret = e; | |
2625 | return 1; | |
2626 | } | |
2627 | ||
2628 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2629 | assert_return(e, -EINVAL); | |
2630 | assert_return(tid, -EINVAL); | |
76b54375 | 2631 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2632 | |
76b54375 LP |
2633 | if (e->tid != 0) { |
2634 | *tid = e->tid; | |
2635 | return 0; | |
2636 | } | |
2637 | ||
2638 | return -ENXIO; | |
afc6adb5 | 2639 | } |
cde93897 LP |
2640 | |
2641 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2642 | int r; | |
2643 | ||
2644 | assert_return(e, -EINVAL); | |
8f726607 | 2645 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2646 | |
2647 | if (e->watchdog == !!b) | |
2648 | return e->watchdog; | |
2649 | ||
2650 | if (b) { | |
2651 | struct epoll_event ev = {}; | |
cde93897 | 2652 | |
09812eb7 LP |
2653 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2654 | if (r <= 0) | |
cde93897 | 2655 | return r; |
cde93897 LP |
2656 | |
2657 | /* Issue first ping immediately */ | |
2658 | sd_notify(false, "WATCHDOG=1"); | |
2659 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2660 | ||
2661 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2662 | if (e->watchdog_fd < 0) | |
2663 | return -errno; | |
2664 | ||
2665 | r = arm_watchdog(e); | |
2666 | if (r < 0) | |
2667 | goto fail; | |
2668 | ||
2669 | ev.events = EPOLLIN; | |
2670 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2671 | ||
2672 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2673 | if (r < 0) { | |
2674 | r = -errno; | |
2675 | goto fail; | |
2676 | } | |
2677 | ||
2678 | } else { | |
2679 | if (e->watchdog_fd >= 0) { | |
2680 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2681 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2682 | } |
2683 | } | |
2684 | ||
2685 | e->watchdog = !!b; | |
2686 | return e->watchdog; | |
2687 | ||
2688 | fail: | |
03e334a1 | 2689 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2690 | return r; |
2691 | } | |
8f726607 LP |
2692 | |
2693 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2694 | assert_return(e, -EINVAL); | |
2695 | assert_return(!event_pid_changed(e), -ECHILD); | |
2696 | ||
2697 | return e->watchdog; | |
2698 | } |