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fd38203a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/epoll.h> | |
23 | #include <sys/timerfd.h> | |
24 | #include <sys/wait.h> | |
3022d74b | 25 | #include <pthread.h> |
fd38203a | 26 | |
afc6adb5 | 27 | #include "sd-id128.h" |
cde93897 | 28 | #include "sd-daemon.h" |
fd38203a | 29 | #include "macro.h" |
fd38203a LP |
30 | #include "prioq.h" |
31 | #include "hashmap.h" | |
32 | #include "util.h" | |
33 | #include "time-util.h" | |
afc6adb5 | 34 | #include "missing.h" |
6e9feda3 | 35 | #include "set.h" |
fd38203a LP |
36 | |
37 | #include "sd-event.h" | |
38 | ||
15b38f93 | 39 | #define EPOLL_QUEUE_MAX 512U |
c2ba3ad6 | 40 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
41 | |
42 | typedef enum EventSourceType { | |
43 | SOURCE_IO, | |
6a0f1f6d LP |
44 | SOURCE_TIME_REALTIME, |
45 | SOURCE_TIME_MONOTONIC, | |
46 | SOURCE_TIME_REALTIME_ALARM, | |
47 | SOURCE_TIME_BOOTTIME_ALARM, | |
fd38203a LP |
48 | SOURCE_SIGNAL, |
49 | SOURCE_CHILD, | |
da7e457c | 50 | SOURCE_DEFER, |
6e9feda3 | 51 | SOURCE_POST, |
6203e07a | 52 | SOURCE_EXIT, |
6a0f1f6d LP |
53 | SOURCE_WATCHDOG, |
54 | _SOUFCE_EVENT_SOURCE_TYPE_MAX, | |
55 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 | |
fd38203a LP |
56 | } EventSourceType; |
57 | ||
6a0f1f6d LP |
58 | #define EVENT_SOURCE_IS_TIME(t) IN_SET((t), SOURCE_TIME_REALTIME, SOURCE_TIME_MONOTONIC, SOURCE_TIME_REALTIME_ALARM, SOURCE_TIME_BOOTTIME_ALARM) |
59 | ||
fd38203a | 60 | struct sd_event_source { |
da7e457c | 61 | unsigned n_ref; |
fd38203a LP |
62 | |
63 | sd_event *event; | |
64 | void *userdata; | |
718db961 | 65 | sd_event_handler_t prepare; |
fd38203a | 66 | |
6a0f1f6d | 67 | EventSourceType type:5; |
baf76283 | 68 | int enabled:3; |
fd38203a | 69 | bool pending:1; |
12179984 | 70 | bool dispatching:1; |
fd38203a | 71 | |
31927c16 | 72 | int64_t priority; |
fd38203a LP |
73 | unsigned pending_index; |
74 | unsigned prepare_index; | |
75 | unsigned pending_iteration; | |
76 | unsigned prepare_iteration; | |
77 | ||
78 | union { | |
79 | struct { | |
718db961 | 80 | sd_event_io_handler_t callback; |
fd38203a LP |
81 | int fd; |
82 | uint32_t events; | |
83 | uint32_t revents; | |
84 | bool registered:1; | |
85 | } io; | |
86 | struct { | |
718db961 | 87 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
88 | usec_t next, accuracy; |
89 | unsigned earliest_index; | |
90 | unsigned latest_index; | |
fd38203a LP |
91 | } time; |
92 | struct { | |
718db961 | 93 | sd_event_signal_handler_t callback; |
fd38203a LP |
94 | struct signalfd_siginfo siginfo; |
95 | int sig; | |
96 | } signal; | |
97 | struct { | |
718db961 | 98 | sd_event_child_handler_t callback; |
fd38203a LP |
99 | siginfo_t siginfo; |
100 | pid_t pid; | |
101 | int options; | |
102 | } child; | |
103 | struct { | |
718db961 | 104 | sd_event_handler_t callback; |
fd38203a | 105 | } defer; |
6e9feda3 LP |
106 | struct { |
107 | sd_event_handler_t callback; | |
108 | } post; | |
da7e457c | 109 | struct { |
718db961 | 110 | sd_event_handler_t callback; |
da7e457c | 111 | unsigned prioq_index; |
6203e07a | 112 | } exit; |
fd38203a LP |
113 | }; |
114 | }; | |
115 | ||
6a0f1f6d LP |
116 | struct clock_data { |
117 | int fd; | |
118 | ||
119 | /* For all clocks we maintain two priority queues each, one | |
120 | * ordered for the earliest times the events may be | |
121 | * dispatched, and one ordered by the latest times they must | |
122 | * have been dispatched. The range between the top entries in | |
123 | * the two prioqs is the time window we can freely schedule | |
124 | * wakeups in */ | |
125 | ||
126 | Prioq *earliest; | |
127 | Prioq *latest; | |
128 | usec_t next; | |
129 | }; | |
130 | ||
fd38203a | 131 | struct sd_event { |
da7e457c | 132 | unsigned n_ref; |
fd38203a LP |
133 | |
134 | int epoll_fd; | |
135 | int signal_fd; | |
cde93897 | 136 | int watchdog_fd; |
fd38203a LP |
137 | |
138 | Prioq *pending; | |
139 | Prioq *prepare; | |
c2ba3ad6 | 140 | |
6a0f1f6d LP |
141 | /* timerfd_create() only supports these four clocks so far. We |
142 | * can add support for more clocks when the kernel learns to | |
143 | * deal with them, too. */ | |
144 | struct clock_data realtime; | |
145 | struct clock_data monotonic; | |
146 | struct clock_data realtime_alarm; | |
147 | struct clock_data boottime_alarm; | |
fd38203a | 148 | |
da7e457c LP |
149 | usec_t perturb; |
150 | ||
fd38203a LP |
151 | sigset_t sigset; |
152 | sd_event_source **signal_sources; | |
153 | ||
154 | Hashmap *child_sources; | |
baf76283 | 155 | unsigned n_enabled_child_sources; |
fd38203a | 156 | |
6e9feda3 LP |
157 | Set *post_sources; |
158 | ||
6203e07a | 159 | Prioq *exit; |
fd38203a | 160 | |
da7e457c | 161 | pid_t original_pid; |
c2ba3ad6 | 162 | |
da7e457c | 163 | unsigned iteration; |
46e8c825 | 164 | dual_timestamp timestamp; |
6a0f1f6d | 165 | usec_t timestamp_boottime; |
da7e457c | 166 | int state; |
eaa3cbef | 167 | |
6203e07a | 168 | bool exit_requested:1; |
da7e457c | 169 | bool need_process_child:1; |
cde93897 | 170 | bool watchdog:1; |
afc6adb5 | 171 | |
6203e07a LP |
172 | int exit_code; |
173 | ||
afc6adb5 LP |
174 | pid_t tid; |
175 | sd_event **default_event_ptr; | |
cde93897 LP |
176 | |
177 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
178 | |
179 | unsigned n_sources; | |
fd38203a LP |
180 | }; |
181 | ||
182 | static int pending_prioq_compare(const void *a, const void *b) { | |
183 | const sd_event_source *x = a, *y = b; | |
184 | ||
185 | assert(x->pending); | |
186 | assert(y->pending); | |
187 | ||
baf76283 LP |
188 | /* Enabled ones first */ |
189 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 190 | return -1; |
baf76283 | 191 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
192 | return 1; |
193 | ||
194 | /* Lower priority values first */ | |
195 | if (x->priority < y->priority) | |
196 | return -1; | |
197 | if (x->priority > y->priority) | |
198 | return 1; | |
199 | ||
200 | /* Older entries first */ | |
201 | if (x->pending_iteration < y->pending_iteration) | |
202 | return -1; | |
203 | if (x->pending_iteration > y->pending_iteration) | |
204 | return 1; | |
205 | ||
206 | /* Stability for the rest */ | |
207 | if (x < y) | |
208 | return -1; | |
dfcd88f6 | 209 | if (x > y) |
fd38203a LP |
210 | return 1; |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | static int prepare_prioq_compare(const void *a, const void *b) { | |
216 | const sd_event_source *x = a, *y = b; | |
217 | ||
218 | assert(x->prepare); | |
219 | assert(y->prepare); | |
220 | ||
221 | /* Move most recently prepared ones last, so that we can stop | |
222 | * preparing as soon as we hit one that has already been | |
223 | * prepared in the current iteration */ | |
224 | if (x->prepare_iteration < y->prepare_iteration) | |
225 | return -1; | |
226 | if (x->prepare_iteration > y->prepare_iteration) | |
227 | return 1; | |
228 | ||
baf76283 LP |
229 | /* Enabled ones first */ |
230 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 231 | return -1; |
baf76283 | 232 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
233 | return 1; |
234 | ||
235 | /* Lower priority values first */ | |
236 | if (x->priority < y->priority) | |
237 | return -1; | |
238 | if (x->priority > y->priority) | |
239 | return 1; | |
240 | ||
241 | /* Stability for the rest */ | |
242 | if (x < y) | |
243 | return -1; | |
dfcd88f6 | 244 | if (x > y) |
fd38203a LP |
245 | return 1; |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
c2ba3ad6 | 250 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
251 | const sd_event_source *x = a, *y = b; |
252 | ||
6a0f1f6d LP |
253 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
254 | assert(x->type == y->type); | |
fd38203a | 255 | |
baf76283 LP |
256 | /* Enabled ones first */ |
257 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 258 | return -1; |
baf76283 | 259 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
260 | return 1; |
261 | ||
262 | /* Move the pending ones to the end */ | |
263 | if (!x->pending && y->pending) | |
264 | return -1; | |
265 | if (x->pending && !y->pending) | |
266 | return 1; | |
267 | ||
268 | /* Order by time */ | |
269 | if (x->time.next < y->time.next) | |
270 | return -1; | |
271 | if (x->time.next > y->time.next) | |
a99badf5 | 272 | return 1; |
fd38203a LP |
273 | |
274 | /* Stability for the rest */ | |
275 | if (x < y) | |
276 | return -1; | |
dfcd88f6 | 277 | if (x > y) |
fd38203a LP |
278 | return 1; |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
c2ba3ad6 LP |
283 | static int latest_time_prioq_compare(const void *a, const void *b) { |
284 | const sd_event_source *x = a, *y = b; | |
285 | ||
6a0f1f6d LP |
286 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
287 | assert(x->type == y->type); | |
c2ba3ad6 | 288 | |
baf76283 LP |
289 | /* Enabled ones first */ |
290 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 291 | return -1; |
baf76283 | 292 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
293 | return 1; |
294 | ||
295 | /* Move the pending ones to the end */ | |
296 | if (!x->pending && y->pending) | |
297 | return -1; | |
298 | if (x->pending && !y->pending) | |
299 | return 1; | |
300 | ||
301 | /* Order by time */ | |
302 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
303 | return -1; | |
304 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
a99badf5 | 305 | return 1; |
c2ba3ad6 LP |
306 | |
307 | /* Stability for the rest */ | |
308 | if (x < y) | |
309 | return -1; | |
310 | if (x > y) | |
311 | return 1; | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
6203e07a | 316 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
317 | const sd_event_source *x = a, *y = b; |
318 | ||
6203e07a LP |
319 | assert(x->type == SOURCE_EXIT); |
320 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 321 | |
baf76283 LP |
322 | /* Enabled ones first */ |
323 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 324 | return -1; |
baf76283 | 325 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
326 | return 1; |
327 | ||
328 | /* Lower priority values first */ | |
329 | if (x->priority < y->priority) | |
330 | return -1; | |
331 | if (x->priority > y->priority) | |
332 | return 1; | |
333 | ||
334 | /* Stability for the rest */ | |
335 | if (x < y) | |
336 | return -1; | |
337 | if (x > y) | |
338 | return 1; | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
6a0f1f6d LP |
343 | static void free_clock_data(struct clock_data *d) { |
344 | assert(d); | |
345 | ||
346 | safe_close(d->fd); | |
347 | prioq_free(d->earliest); | |
348 | prioq_free(d->latest); | |
349 | } | |
350 | ||
fd38203a LP |
351 | static void event_free(sd_event *e) { |
352 | assert(e); | |
15b38f93 | 353 | assert(e->n_sources == 0); |
fd38203a | 354 | |
afc6adb5 LP |
355 | if (e->default_event_ptr) |
356 | *(e->default_event_ptr) = NULL; | |
357 | ||
03e334a1 LP |
358 | safe_close(e->epoll_fd); |
359 | safe_close(e->signal_fd); | |
03e334a1 | 360 | safe_close(e->watchdog_fd); |
cde93897 | 361 | |
6a0f1f6d LP |
362 | free_clock_data(&e->realtime); |
363 | free_clock_data(&e->monotonic); | |
364 | free_clock_data(&e->realtime_alarm); | |
365 | free_clock_data(&e->boottime_alarm); | |
366 | ||
fd38203a LP |
367 | prioq_free(e->pending); |
368 | prioq_free(e->prepare); | |
6203e07a | 369 | prioq_free(e->exit); |
fd38203a LP |
370 | |
371 | free(e->signal_sources); | |
372 | ||
373 | hashmap_free(e->child_sources); | |
6e9feda3 | 374 | set_free(e->post_sources); |
fd38203a LP |
375 | free(e); |
376 | } | |
377 | ||
f7262a9f | 378 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
379 | sd_event *e; |
380 | int r; | |
381 | ||
305f78bf | 382 | assert_return(ret, -EINVAL); |
fd38203a LP |
383 | |
384 | e = new0(sd_event, 1); | |
385 | if (!e) | |
386 | return -ENOMEM; | |
387 | ||
da7e457c | 388 | e->n_ref = 1; |
6a0f1f6d LP |
389 | e->signal_fd = e->watchdog_fd = e->epoll_fd = e->realtime.fd = e->monotonic.fd = e->realtime_alarm.fd = e->boottime_alarm.fd = -1; |
390 | e->realtime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = (usec_t) -1; | |
eaa3cbef | 391 | e->original_pid = getpid(); |
6a0f1f6d | 392 | e->perturb = (usec_t) -1; |
fd38203a LP |
393 | |
394 | assert_se(sigemptyset(&e->sigset) == 0); | |
395 | ||
396 | e->pending = prioq_new(pending_prioq_compare); | |
397 | if (!e->pending) { | |
398 | r = -ENOMEM; | |
399 | goto fail; | |
400 | } | |
401 | ||
402 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
403 | if (e->epoll_fd < 0) { | |
404 | r = -errno; | |
405 | goto fail; | |
406 | } | |
407 | ||
408 | *ret = e; | |
409 | return 0; | |
410 | ||
411 | fail: | |
412 | event_free(e); | |
413 | return r; | |
414 | } | |
415 | ||
f7262a9f | 416 | _public_ sd_event* sd_event_ref(sd_event *e) { |
305f78bf | 417 | assert_return(e, NULL); |
fd38203a | 418 | |
da7e457c LP |
419 | assert(e->n_ref >= 1); |
420 | e->n_ref++; | |
fd38203a LP |
421 | |
422 | return e; | |
423 | } | |
424 | ||
f7262a9f | 425 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
426 | |
427 | if (!e) | |
428 | return NULL; | |
fd38203a | 429 | |
da7e457c LP |
430 | assert(e->n_ref >= 1); |
431 | e->n_ref--; | |
432 | ||
433 | if (e->n_ref <= 0) | |
fd38203a LP |
434 | event_free(e); |
435 | ||
436 | return NULL; | |
437 | } | |
438 | ||
eaa3cbef LP |
439 | static bool event_pid_changed(sd_event *e) { |
440 | assert(e); | |
441 | ||
442 | /* We don't support people creating am event loop and keeping | |
443 | * it around over a fork(). Let's complain. */ | |
444 | ||
445 | return e->original_pid != getpid(); | |
446 | } | |
447 | ||
fd38203a LP |
448 | static int source_io_unregister(sd_event_source *s) { |
449 | int r; | |
450 | ||
451 | assert(s); | |
452 | assert(s->type == SOURCE_IO); | |
453 | ||
454 | if (!s->io.registered) | |
455 | return 0; | |
456 | ||
457 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
458 | if (r < 0) | |
459 | return -errno; | |
460 | ||
461 | s->io.registered = false; | |
462 | return 0; | |
463 | } | |
464 | ||
305f78bf LP |
465 | static int source_io_register( |
466 | sd_event_source *s, | |
467 | int enabled, | |
468 | uint32_t events) { | |
469 | ||
fd38203a LP |
470 | struct epoll_event ev = {}; |
471 | int r; | |
472 | ||
473 | assert(s); | |
474 | assert(s->type == SOURCE_IO); | |
baf76283 | 475 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
476 | |
477 | ev.events = events; | |
478 | ev.data.ptr = s; | |
479 | ||
baf76283 | 480 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
481 | ev.events |= EPOLLONESHOT; |
482 | ||
483 | if (s->io.registered) | |
484 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
485 | else | |
486 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
487 | ||
488 | if (r < 0) | |
489 | return -errno; | |
490 | ||
491 | s->io.registered = true; | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
6a0f1f6d LP |
496 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
497 | ||
498 | switch (t) { | |
499 | ||
500 | case SOURCE_TIME_REALTIME: | |
501 | return CLOCK_REALTIME; | |
502 | ||
503 | case SOURCE_TIME_MONOTONIC: | |
504 | return CLOCK_MONOTONIC; | |
505 | ||
506 | case SOURCE_TIME_REALTIME_ALARM: | |
507 | return CLOCK_REALTIME_ALARM; | |
508 | ||
509 | case SOURCE_TIME_BOOTTIME_ALARM: | |
510 | return CLOCK_BOOTTIME_ALARM; | |
511 | ||
512 | default: | |
513 | return (clockid_t) -1; | |
514 | } | |
515 | } | |
516 | ||
517 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
518 | ||
519 | switch (clock) { | |
520 | ||
521 | case CLOCK_REALTIME: | |
522 | return SOURCE_TIME_REALTIME; | |
523 | ||
524 | case CLOCK_MONOTONIC: | |
525 | return SOURCE_TIME_MONOTONIC; | |
526 | ||
527 | case CLOCK_REALTIME_ALARM: | |
528 | return SOURCE_TIME_REALTIME_ALARM; | |
529 | ||
530 | case CLOCK_BOOTTIME_ALARM: | |
531 | return SOURCE_TIME_BOOTTIME_ALARM; | |
532 | ||
533 | default: | |
534 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
535 | } | |
536 | } | |
537 | ||
538 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
539 | assert(e); | |
540 | ||
541 | switch (t) { | |
542 | ||
543 | case SOURCE_TIME_REALTIME: | |
544 | return &e->realtime; | |
545 | ||
546 | case SOURCE_TIME_MONOTONIC: | |
547 | return &e->monotonic; | |
548 | ||
549 | case SOURCE_TIME_REALTIME_ALARM: | |
550 | return &e->realtime_alarm; | |
551 | ||
552 | case SOURCE_TIME_BOOTTIME_ALARM: | |
553 | return &e->boottime_alarm; | |
554 | ||
555 | default: | |
556 | return NULL; | |
557 | } | |
558 | } | |
559 | ||
fd38203a LP |
560 | static void source_free(sd_event_source *s) { |
561 | assert(s); | |
562 | ||
563 | if (s->event) { | |
15b38f93 LP |
564 | assert(s->event->n_sources > 0); |
565 | ||
fd38203a LP |
566 | switch (s->type) { |
567 | ||
568 | case SOURCE_IO: | |
569 | if (s->io.fd >= 0) | |
570 | source_io_unregister(s); | |
571 | ||
572 | break; | |
573 | ||
6a0f1f6d LP |
574 | case SOURCE_TIME_REALTIME: |
575 | case SOURCE_TIME_MONOTONIC: | |
576 | case SOURCE_TIME_REALTIME_ALARM: | |
577 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
578 | struct clock_data *d; | |
579 | ||
580 | d = event_get_clock_data(s->event, s->type); | |
581 | assert(d); | |
fd38203a | 582 | |
6a0f1f6d LP |
583 | prioq_remove(d->earliest, s, &s->time.earliest_index); |
584 | prioq_remove(d->latest, s, &s->time.latest_index); | |
fd38203a | 585 | break; |
6a0f1f6d | 586 | } |
fd38203a LP |
587 | |
588 | case SOURCE_SIGNAL: | |
589 | if (s->signal.sig > 0) { | |
baf76283 | 590 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) |
fd38203a LP |
591 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
592 | ||
593 | if (s->event->signal_sources) | |
594 | s->event->signal_sources[s->signal.sig] = NULL; | |
595 | } | |
596 | ||
597 | break; | |
598 | ||
599 | case SOURCE_CHILD: | |
600 | if (s->child.pid > 0) { | |
baf76283 LP |
601 | if (s->enabled != SD_EVENT_OFF) { |
602 | assert(s->event->n_enabled_child_sources > 0); | |
603 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
604 | } |
605 | ||
606 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) | |
607 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
608 | ||
609 | hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid)); | |
610 | } | |
611 | ||
612 | break; | |
da7e457c | 613 | |
0eb2e0e3 ZJS |
614 | case SOURCE_DEFER: |
615 | /* nothing */ | |
616 | break; | |
617 | ||
6e9feda3 LP |
618 | case SOURCE_POST: |
619 | set_remove(s->event->post_sources, s); | |
620 | break; | |
621 | ||
6203e07a LP |
622 | case SOURCE_EXIT: |
623 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
da7e457c | 624 | break; |
9d3e3aa5 | 625 | |
6a0f1f6d | 626 | default: |
9d3e3aa5 | 627 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
628 | } |
629 | ||
630 | if (s->pending) | |
631 | prioq_remove(s->event->pending, s, &s->pending_index); | |
632 | ||
633 | if (s->prepare) | |
634 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
635 | ||
15b38f93 | 636 | s->event->n_sources--; |
fd38203a LP |
637 | sd_event_unref(s->event); |
638 | } | |
639 | ||
640 | free(s); | |
641 | } | |
642 | ||
643 | static int source_set_pending(sd_event_source *s, bool b) { | |
644 | int r; | |
645 | ||
646 | assert(s); | |
6203e07a | 647 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
648 | |
649 | if (s->pending == b) | |
650 | return 0; | |
651 | ||
652 | s->pending = b; | |
653 | ||
654 | if (b) { | |
655 | s->pending_iteration = s->event->iteration; | |
656 | ||
657 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
658 | if (r < 0) { | |
659 | s->pending = false; | |
660 | return r; | |
661 | } | |
662 | } else | |
663 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
664 | ||
6a0f1f6d LP |
665 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
666 | struct clock_data *d; | |
667 | ||
668 | d = event_get_clock_data(s->event, s->type); | |
669 | assert(d); | |
670 | ||
671 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
672 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
2576a19e LP |
673 | } |
674 | ||
fd38203a LP |
675 | return 0; |
676 | } | |
677 | ||
678 | static sd_event_source *source_new(sd_event *e, EventSourceType type) { | |
679 | sd_event_source *s; | |
680 | ||
681 | assert(e); | |
682 | ||
683 | s = new0(sd_event_source, 1); | |
684 | if (!s) | |
685 | return NULL; | |
686 | ||
da7e457c | 687 | s->n_ref = 1; |
fd38203a LP |
688 | s->event = sd_event_ref(e); |
689 | s->type = type; | |
fd38203a LP |
690 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
691 | ||
15b38f93 LP |
692 | e->n_sources ++; |
693 | ||
fd38203a LP |
694 | return s; |
695 | } | |
696 | ||
f7262a9f | 697 | _public_ int sd_event_add_io( |
fd38203a | 698 | sd_event *e, |
151b9b96 | 699 | sd_event_source **ret, |
fd38203a LP |
700 | int fd, |
701 | uint32_t events, | |
718db961 | 702 | sd_event_io_handler_t callback, |
151b9b96 | 703 | void *userdata) { |
fd38203a LP |
704 | |
705 | sd_event_source *s; | |
706 | int r; | |
707 | ||
305f78bf LP |
708 | assert_return(e, -EINVAL); |
709 | assert_return(fd >= 0, -EINVAL); | |
2a16a986 | 710 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf LP |
711 | assert_return(callback, -EINVAL); |
712 | assert_return(ret, -EINVAL); | |
da7e457c | 713 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 714 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
715 | |
716 | s = source_new(e, SOURCE_IO); | |
717 | if (!s) | |
718 | return -ENOMEM; | |
719 | ||
720 | s->io.fd = fd; | |
721 | s->io.events = events; | |
722 | s->io.callback = callback; | |
723 | s->userdata = userdata; | |
baf76283 | 724 | s->enabled = SD_EVENT_ON; |
fd38203a | 725 | |
baf76283 | 726 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
727 | if (r < 0) { |
728 | source_free(s); | |
729 | return -errno; | |
730 | } | |
731 | ||
732 | *ret = s; | |
733 | return 0; | |
734 | } | |
735 | ||
736 | static int event_setup_timer_fd( | |
737 | sd_event *e, | |
6a0f1f6d LP |
738 | struct clock_data *d, |
739 | clockid_t clock) { | |
fd38203a | 740 | |
39883f62 | 741 | sd_id128_t bootid = {}; |
fd38203a LP |
742 | struct epoll_event ev = {}; |
743 | int r, fd; | |
744 | ||
745 | assert(e); | |
6a0f1f6d | 746 | assert(d); |
fd38203a | 747 | |
6a0f1f6d | 748 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
749 | return 0; |
750 | ||
6a0f1f6d | 751 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
752 | if (fd < 0) |
753 | return -errno; | |
754 | ||
755 | ev.events = EPOLLIN; | |
6a0f1f6d | 756 | ev.data.ptr = INT_TO_PTR(clock_to_event_source_type(clock)); |
fd38203a LP |
757 | |
758 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
759 | if (r < 0) { | |
03e334a1 | 760 | safe_close(fd); |
fd38203a LP |
761 | return -errno; |
762 | } | |
763 | ||
6a0f1f6d LP |
764 | d->fd = fd; |
765 | ||
c2ba3ad6 | 766 | /* When we sleep for longer, we try to realign the wakeup to |
850516e0 LP |
767 | the same time wihtin each minute/second/250ms, so that |
768 | events all across the system can be coalesced into a single | |
769 | CPU wakeup. However, let's take some system-specific | |
770 | randomness for this value, so that in a network of systems | |
771 | with synced clocks timer events are distributed a | |
772 | bit. Here, we calculate a perturbation usec offset from the | |
773 | boot ID. */ | |
c2ba3ad6 | 774 | |
6a0f1f6d LP |
775 | if (e->perturb == (usec_t) -1) |
776 | if (sd_id128_get_boot(&bootid) >= 0) | |
777 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
c2ba3ad6 | 778 | |
fd38203a LP |
779 | return 0; |
780 | } | |
781 | ||
6a0f1f6d | 782 | _public_ int sd_event_add_time( |
fd38203a | 783 | sd_event *e, |
151b9b96 | 784 | sd_event_source **ret, |
6a0f1f6d | 785 | clockid_t clock, |
fd38203a | 786 | uint64_t usec, |
c2ba3ad6 | 787 | uint64_t accuracy, |
718db961 | 788 | sd_event_time_handler_t callback, |
151b9b96 | 789 | void *userdata) { |
fd38203a | 790 | |
6a0f1f6d | 791 | EventSourceType type; |
fd38203a | 792 | sd_event_source *s; |
6a0f1f6d | 793 | struct clock_data *d; |
fd38203a LP |
794 | int r; |
795 | ||
305f78bf | 796 | assert_return(e, -EINVAL); |
305f78bf LP |
797 | assert_return(ret, -EINVAL); |
798 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
799 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 800 | assert_return(callback, -EINVAL); |
da7e457c | 801 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 802 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 803 | |
6a0f1f6d LP |
804 | type = clock_to_event_source_type(clock); |
805 | assert_return(type >= 0, -ENOTSUP); | |
806 | ||
807 | d = event_get_clock_data(e, type); | |
808 | assert(d); | |
c2ba3ad6 | 809 | |
6a0f1f6d LP |
810 | if (!d->earliest) { |
811 | d->earliest = prioq_new(earliest_time_prioq_compare); | |
812 | if (!d->earliest) | |
c2ba3ad6 LP |
813 | return -ENOMEM; |
814 | } | |
fd38203a | 815 | |
6a0f1f6d LP |
816 | if (!d->latest) { |
817 | d->latest = prioq_new(latest_time_prioq_compare); | |
818 | if (!d->latest) | |
fd38203a LP |
819 | return -ENOMEM; |
820 | } | |
821 | ||
6a0f1f6d LP |
822 | if (d->fd < 0) { |
823 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
824 | if (r < 0) |
825 | return r; | |
826 | } | |
827 | ||
828 | s = source_new(e, type); | |
829 | if (!s) | |
830 | return -ENOMEM; | |
831 | ||
832 | s->time.next = usec; | |
c2ba3ad6 | 833 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 834 | s->time.callback = callback; |
da7e457c | 835 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 836 | s->userdata = userdata; |
baf76283 | 837 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 838 | |
6a0f1f6d | 839 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
840 | if (r < 0) |
841 | goto fail; | |
842 | ||
6a0f1f6d | 843 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
844 | if (r < 0) |
845 | goto fail; | |
fd38203a LP |
846 | |
847 | *ret = s; | |
848 | return 0; | |
c2ba3ad6 LP |
849 | |
850 | fail: | |
851 | source_free(s); | |
852 | return r; | |
fd38203a LP |
853 | } |
854 | ||
fd38203a LP |
855 | static int event_update_signal_fd(sd_event *e) { |
856 | struct epoll_event ev = {}; | |
857 | bool add_to_epoll; | |
858 | int r; | |
859 | ||
860 | assert(e); | |
861 | ||
862 | add_to_epoll = e->signal_fd < 0; | |
863 | ||
864 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
865 | if (r < 0) | |
866 | return -errno; | |
867 | ||
868 | e->signal_fd = r; | |
869 | ||
870 | if (!add_to_epoll) | |
871 | return 0; | |
872 | ||
873 | ev.events = EPOLLIN; | |
874 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
875 | ||
876 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
877 | if (r < 0) { | |
03e334a1 | 878 | e->signal_fd = safe_close(e->signal_fd); |
fd38203a LP |
879 | return -errno; |
880 | } | |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
f7262a9f | 885 | _public_ int sd_event_add_signal( |
305f78bf | 886 | sd_event *e, |
151b9b96 | 887 | sd_event_source **ret, |
305f78bf | 888 | int sig, |
718db961 | 889 | sd_event_signal_handler_t callback, |
151b9b96 | 890 | void *userdata) { |
305f78bf | 891 | |
fd38203a | 892 | sd_event_source *s; |
3022d74b | 893 | sigset_t ss; |
fd38203a LP |
894 | int r; |
895 | ||
305f78bf LP |
896 | assert_return(e, -EINVAL); |
897 | assert_return(sig > 0, -EINVAL); | |
898 | assert_return(sig < _NSIG, -EINVAL); | |
899 | assert_return(callback, -EINVAL); | |
900 | assert_return(ret, -EINVAL); | |
da7e457c | 901 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 902 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 903 | |
3022d74b LP |
904 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
905 | if (r < 0) | |
906 | return -errno; | |
907 | ||
908 | if (!sigismember(&ss, sig)) | |
909 | return -EBUSY; | |
910 | ||
fd38203a LP |
911 | if (!e->signal_sources) { |
912 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
913 | if (!e->signal_sources) | |
914 | return -ENOMEM; | |
915 | } else if (e->signal_sources[sig]) | |
916 | return -EBUSY; | |
917 | ||
918 | s = source_new(e, SOURCE_SIGNAL); | |
919 | if (!s) | |
920 | return -ENOMEM; | |
921 | ||
922 | s->signal.sig = sig; | |
923 | s->signal.callback = callback; | |
924 | s->userdata = userdata; | |
baf76283 | 925 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
926 | |
927 | e->signal_sources[sig] = s; | |
928 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
929 | ||
baf76283 | 930 | if (sig != SIGCHLD || e->n_enabled_child_sources == 0) { |
fd38203a LP |
931 | r = event_update_signal_fd(e); |
932 | if (r < 0) { | |
933 | source_free(s); | |
934 | return r; | |
935 | } | |
936 | } | |
937 | ||
938 | *ret = s; | |
939 | return 0; | |
940 | } | |
941 | ||
f7262a9f | 942 | _public_ int sd_event_add_child( |
305f78bf | 943 | sd_event *e, |
151b9b96 | 944 | sd_event_source **ret, |
305f78bf LP |
945 | pid_t pid, |
946 | int options, | |
718db961 | 947 | sd_event_child_handler_t callback, |
151b9b96 | 948 | void *userdata) { |
305f78bf | 949 | |
fd38203a LP |
950 | sd_event_source *s; |
951 | int r; | |
952 | ||
305f78bf LP |
953 | assert_return(e, -EINVAL); |
954 | assert_return(pid > 1, -EINVAL); | |
955 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
956 | assert_return(options != 0, -EINVAL); | |
957 | assert_return(callback, -EINVAL); | |
958 | assert_return(ret, -EINVAL); | |
da7e457c | 959 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 960 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
961 | |
962 | r = hashmap_ensure_allocated(&e->child_sources, trivial_hash_func, trivial_compare_func); | |
963 | if (r < 0) | |
964 | return r; | |
965 | ||
966 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
967 | return -EBUSY; | |
968 | ||
969 | s = source_new(e, SOURCE_CHILD); | |
970 | if (!s) | |
971 | return -ENOMEM; | |
972 | ||
973 | s->child.pid = pid; | |
974 | s->child.options = options; | |
975 | s->child.callback = callback; | |
976 | s->userdata = userdata; | |
baf76283 | 977 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
978 | |
979 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
980 | if (r < 0) { | |
981 | source_free(s); | |
982 | return r; | |
983 | } | |
984 | ||
baf76283 | 985 | e->n_enabled_child_sources ++; |
fd38203a LP |
986 | |
987 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
988 | ||
989 | if (!e->signal_sources || !e->signal_sources[SIGCHLD]) { | |
990 | r = event_update_signal_fd(e); | |
991 | if (r < 0) { | |
992 | source_free(s); | |
993 | return -errno; | |
994 | } | |
995 | } | |
996 | ||
c2ba3ad6 LP |
997 | e->need_process_child = true; |
998 | ||
fd38203a LP |
999 | *ret = s; |
1000 | return 0; | |
1001 | } | |
1002 | ||
f7262a9f | 1003 | _public_ int sd_event_add_defer( |
305f78bf | 1004 | sd_event *e, |
151b9b96 | 1005 | sd_event_source **ret, |
718db961 | 1006 | sd_event_handler_t callback, |
151b9b96 | 1007 | void *userdata) { |
305f78bf | 1008 | |
fd38203a LP |
1009 | sd_event_source *s; |
1010 | int r; | |
1011 | ||
305f78bf LP |
1012 | assert_return(e, -EINVAL); |
1013 | assert_return(callback, -EINVAL); | |
1014 | assert_return(ret, -EINVAL); | |
da7e457c | 1015 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1016 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
1017 | |
1018 | s = source_new(e, SOURCE_DEFER); | |
1019 | if (!s) | |
1020 | return -ENOMEM; | |
1021 | ||
1022 | s->defer.callback = callback; | |
1023 | s->userdata = userdata; | |
baf76283 | 1024 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1025 | |
1026 | r = source_set_pending(s, true); | |
1027 | if (r < 0) { | |
1028 | source_free(s); | |
1029 | return r; | |
1030 | } | |
1031 | ||
1032 | *ret = s; | |
1033 | return 0; | |
1034 | } | |
1035 | ||
6e9feda3 LP |
1036 | _public_ int sd_event_add_post( |
1037 | sd_event *e, | |
1038 | sd_event_source **ret, | |
1039 | sd_event_handler_t callback, | |
1040 | void *userdata) { | |
1041 | ||
1042 | sd_event_source *s; | |
1043 | int r; | |
1044 | ||
1045 | assert_return(e, -EINVAL); | |
1046 | assert_return(callback, -EINVAL); | |
1047 | assert_return(ret, -EINVAL); | |
1048 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1049 | assert_return(!event_pid_changed(e), -ECHILD); | |
1050 | ||
1051 | r = set_ensure_allocated(&e->post_sources, trivial_hash_func, trivial_compare_func); | |
1052 | if (r < 0) | |
1053 | return r; | |
1054 | ||
1055 | s = source_new(e, SOURCE_POST); | |
1056 | if (!s) | |
1057 | return -ENOMEM; | |
1058 | ||
1059 | s->post.callback = callback; | |
1060 | s->userdata = userdata; | |
1061 | s->enabled = SD_EVENT_ON; | |
1062 | ||
1063 | r = set_put(e->post_sources, s); | |
1064 | if (r < 0) { | |
1065 | source_free(s); | |
1066 | return r; | |
1067 | } | |
1068 | ||
1069 | *ret = s; | |
1070 | return 0; | |
1071 | } | |
1072 | ||
6203e07a | 1073 | _public_ int sd_event_add_exit( |
305f78bf | 1074 | sd_event *e, |
151b9b96 | 1075 | sd_event_source **ret, |
718db961 | 1076 | sd_event_handler_t callback, |
151b9b96 | 1077 | void *userdata) { |
305f78bf | 1078 | |
da7e457c LP |
1079 | sd_event_source *s; |
1080 | int r; | |
1081 | ||
1082 | assert_return(e, -EINVAL); | |
1083 | assert_return(callback, -EINVAL); | |
305f78bf | 1084 | assert_return(ret, -EINVAL); |
da7e457c LP |
1085 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1086 | assert_return(!event_pid_changed(e), -ECHILD); | |
1087 | ||
6203e07a LP |
1088 | if (!e->exit) { |
1089 | e->exit = prioq_new(exit_prioq_compare); | |
1090 | if (!e->exit) | |
da7e457c LP |
1091 | return -ENOMEM; |
1092 | } | |
1093 | ||
6203e07a | 1094 | s = source_new(e, SOURCE_EXIT); |
fd38203a | 1095 | if (!s) |
da7e457c | 1096 | return -ENOMEM; |
fd38203a | 1097 | |
6203e07a | 1098 | s->exit.callback = callback; |
da7e457c | 1099 | s->userdata = userdata; |
6203e07a | 1100 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1101 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1102 | |
6203e07a | 1103 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1104 | if (r < 0) { |
1105 | source_free(s); | |
1106 | return r; | |
1107 | } | |
1108 | ||
1109 | *ret = s; | |
1110 | return 0; | |
1111 | } | |
1112 | ||
f7262a9f | 1113 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
da7e457c LP |
1114 | assert_return(s, NULL); |
1115 | ||
1116 | assert(s->n_ref >= 1); | |
1117 | s->n_ref++; | |
fd38203a LP |
1118 | |
1119 | return s; | |
1120 | } | |
1121 | ||
f7262a9f | 1122 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1123 | |
1124 | if (!s) | |
1125 | return NULL; | |
fd38203a | 1126 | |
da7e457c LP |
1127 | assert(s->n_ref >= 1); |
1128 | s->n_ref--; | |
1129 | ||
12179984 LP |
1130 | if (s->n_ref <= 0) { |
1131 | /* Here's a special hack: when we are called from a | |
1132 | * dispatch handler we won't free the event source | |
1133 | * immediately, but we will detach the fd from the | |
1134 | * epoll. This way it is safe for the caller to unref | |
1135 | * the event source and immediately close the fd, but | |
1136 | * we still retain a valid event source object after | |
1137 | * the callback. */ | |
1138 | ||
1139 | if (s->dispatching) { | |
1140 | if (s->type == SOURCE_IO) | |
1141 | source_io_unregister(s); | |
1142 | } else | |
1143 | source_free(s); | |
1144 | } | |
fd38203a LP |
1145 | |
1146 | return NULL; | |
1147 | } | |
1148 | ||
adcc4ca3 | 1149 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1150 | assert_return(s, NULL); |
eaa3cbef LP |
1151 | |
1152 | return s->event; | |
1153 | } | |
1154 | ||
f7262a9f | 1155 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1156 | assert_return(s, -EINVAL); |
6203e07a | 1157 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1158 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1159 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1160 | |
1161 | return s->pending; | |
1162 | } | |
1163 | ||
f7262a9f | 1164 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1165 | assert_return(s, -EINVAL); |
1166 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1167 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1168 | |
1169 | return s->io.fd; | |
1170 | } | |
1171 | ||
30caf8f3 LP |
1172 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1173 | int r; | |
1174 | ||
1175 | assert_return(s, -EINVAL); | |
1176 | assert_return(fd >= 0, -EINVAL); | |
1177 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1178 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1179 | ||
1180 | if (s->io.fd == fd) | |
1181 | return 0; | |
1182 | ||
1183 | if (s->enabled == SD_EVENT_OFF) { | |
1184 | s->io.fd = fd; | |
1185 | s->io.registered = false; | |
1186 | } else { | |
1187 | int saved_fd; | |
1188 | ||
1189 | saved_fd = s->io.fd; | |
1190 | assert(s->io.registered); | |
1191 | ||
1192 | s->io.fd = fd; | |
1193 | s->io.registered = false; | |
1194 | ||
1195 | r = source_io_register(s, s->enabled, s->io.events); | |
1196 | if (r < 0) { | |
1197 | s->io.fd = saved_fd; | |
1198 | s->io.registered = true; | |
1199 | return r; | |
1200 | } | |
1201 | ||
1202 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1203 | } | |
1204 | ||
1205 | return 0; | |
1206 | } | |
1207 | ||
f7262a9f | 1208 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1209 | assert_return(s, -EINVAL); |
1210 | assert_return(events, -EINVAL); | |
1211 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1212 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1213 | |
1214 | *events = s->io.events; | |
1215 | return 0; | |
1216 | } | |
1217 | ||
f7262a9f | 1218 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1219 | int r; |
1220 | ||
305f78bf LP |
1221 | assert_return(s, -EINVAL); |
1222 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1223 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1224 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1225 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1226 | |
1227 | if (s->io.events == events) | |
1228 | return 0; | |
1229 | ||
baf76283 | 1230 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1231 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1232 | if (r < 0) |
1233 | return r; | |
1234 | } | |
1235 | ||
1236 | s->io.events = events; | |
503f39c3 | 1237 | source_set_pending(s, false); |
fd38203a LP |
1238 | |
1239 | return 0; | |
1240 | } | |
1241 | ||
f7262a9f | 1242 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1243 | assert_return(s, -EINVAL); |
1244 | assert_return(revents, -EINVAL); | |
1245 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1246 | assert_return(s->pending, -ENODATA); | |
1247 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1248 | |
1249 | *revents = s->io.revents; | |
1250 | return 0; | |
1251 | } | |
1252 | ||
f7262a9f | 1253 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1254 | assert_return(s, -EINVAL); |
1255 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1256 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1257 | |
1258 | return s->signal.sig; | |
1259 | } | |
1260 | ||
31927c16 | 1261 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1262 | assert_return(s, -EINVAL); |
1263 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1264 | |
1265 | return s->priority; | |
1266 | } | |
1267 | ||
31927c16 | 1268 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
305f78bf | 1269 | assert_return(s, -EINVAL); |
da7e457c | 1270 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1271 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1272 | |
1273 | if (s->priority == priority) | |
1274 | return 0; | |
1275 | ||
1276 | s->priority = priority; | |
1277 | ||
1278 | if (s->pending) | |
c2ba3ad6 | 1279 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1280 | |
1281 | if (s->prepare) | |
c2ba3ad6 | 1282 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1283 | |
6203e07a LP |
1284 | if (s->type == SOURCE_EXIT) |
1285 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1286 | |
fd38203a LP |
1287 | return 0; |
1288 | } | |
1289 | ||
f7262a9f | 1290 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1291 | assert_return(s, -EINVAL); |
1292 | assert_return(m, -EINVAL); | |
1293 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1294 | |
baf76283 | 1295 | *m = s->enabled; |
fd38203a LP |
1296 | return 0; |
1297 | } | |
1298 | ||
f7262a9f | 1299 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1300 | int r; |
1301 | ||
305f78bf LP |
1302 | assert_return(s, -EINVAL); |
1303 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
da7e457c | 1304 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1305 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1306 | |
baf76283 | 1307 | if (s->enabled == m) |
fd38203a LP |
1308 | return 0; |
1309 | ||
baf76283 | 1310 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1311 | |
1312 | switch (s->type) { | |
1313 | ||
1314 | case SOURCE_IO: | |
1315 | r = source_io_unregister(s); | |
1316 | if (r < 0) | |
1317 | return r; | |
1318 | ||
baf76283 | 1319 | s->enabled = m; |
fd38203a LP |
1320 | break; |
1321 | ||
6a0f1f6d LP |
1322 | case SOURCE_TIME_REALTIME: |
1323 | case SOURCE_TIME_MONOTONIC: | |
1324 | case SOURCE_TIME_REALTIME_ALARM: | |
1325 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1326 | struct clock_data *d; | |
fd38203a | 1327 | |
baf76283 | 1328 | s->enabled = m; |
6a0f1f6d LP |
1329 | d = event_get_clock_data(s->event, s->type); |
1330 | assert(d); | |
1331 | ||
1332 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1333 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a | 1334 | break; |
6a0f1f6d | 1335 | } |
fd38203a LP |
1336 | |
1337 | case SOURCE_SIGNAL: | |
baf76283 LP |
1338 | s->enabled = m; |
1339 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { | |
fd38203a LP |
1340 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
1341 | event_update_signal_fd(s->event); | |
1342 | } | |
1343 | ||
1344 | break; | |
1345 | ||
1346 | case SOURCE_CHILD: | |
baf76283 | 1347 | s->enabled = m; |
fd38203a | 1348 | |
baf76283 LP |
1349 | assert(s->event->n_enabled_child_sources > 0); |
1350 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
1351 | |
1352 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1353 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
1354 | event_update_signal_fd(s->event); | |
1355 | } | |
1356 | ||
1357 | break; | |
1358 | ||
6203e07a | 1359 | case SOURCE_EXIT: |
305f78bf | 1360 | s->enabled = m; |
6203e07a | 1361 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1362 | break; |
1363 | ||
1364 | case SOURCE_DEFER: | |
6e9feda3 | 1365 | case SOURCE_POST: |
baf76283 | 1366 | s->enabled = m; |
fd38203a | 1367 | break; |
9d3e3aa5 | 1368 | |
6a0f1f6d | 1369 | default: |
9d3e3aa5 | 1370 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1371 | } |
1372 | ||
1373 | } else { | |
1374 | switch (s->type) { | |
1375 | ||
1376 | case SOURCE_IO: | |
1377 | r = source_io_register(s, m, s->io.events); | |
1378 | if (r < 0) | |
1379 | return r; | |
1380 | ||
baf76283 | 1381 | s->enabled = m; |
fd38203a LP |
1382 | break; |
1383 | ||
6a0f1f6d LP |
1384 | case SOURCE_TIME_REALTIME: |
1385 | case SOURCE_TIME_MONOTONIC: | |
1386 | case SOURCE_TIME_REALTIME_ALARM: | |
1387 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1388 | struct clock_data *d; | |
fd38203a | 1389 | |
baf76283 | 1390 | s->enabled = m; |
6a0f1f6d LP |
1391 | d = event_get_clock_data(s->event, s->type); |
1392 | assert(d); | |
1393 | ||
1394 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1395 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a | 1396 | break; |
6a0f1f6d | 1397 | } |
fd38203a LP |
1398 | |
1399 | case SOURCE_SIGNAL: | |
baf76283 | 1400 | s->enabled = m; |
fd38203a | 1401 | |
baf76283 | 1402 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { |
fd38203a LP |
1403 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
1404 | event_update_signal_fd(s->event); | |
1405 | } | |
1406 | break; | |
1407 | ||
1408 | case SOURCE_CHILD: | |
baf76283 LP |
1409 | if (s->enabled == SD_EVENT_OFF) { |
1410 | s->event->n_enabled_child_sources++; | |
fd38203a LP |
1411 | |
1412 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1413 | assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0); | |
1414 | event_update_signal_fd(s->event); | |
1415 | } | |
1416 | } | |
7a0d4a3d DH |
1417 | |
1418 | s->enabled = m; | |
fd38203a LP |
1419 | break; |
1420 | ||
6203e07a | 1421 | case SOURCE_EXIT: |
305f78bf | 1422 | s->enabled = m; |
6203e07a | 1423 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1424 | break; |
1425 | ||
1426 | case SOURCE_DEFER: | |
6e9feda3 | 1427 | case SOURCE_POST: |
baf76283 | 1428 | s->enabled = m; |
fd38203a | 1429 | break; |
9d3e3aa5 | 1430 | |
6a0f1f6d | 1431 | default: |
9d3e3aa5 | 1432 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1433 | } |
1434 | } | |
1435 | ||
1436 | if (s->pending) | |
1437 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1438 | ||
1439 | if (s->prepare) | |
1440 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1441 | ||
1442 | return 0; | |
1443 | } | |
1444 | ||
f7262a9f | 1445 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1446 | assert_return(s, -EINVAL); |
1447 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1448 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1449 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1450 | |
1451 | *usec = s->time.next; | |
1452 | return 0; | |
1453 | } | |
1454 | ||
f7262a9f | 1455 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1456 | struct clock_data *d; |
1457 | ||
305f78bf LP |
1458 | assert_return(s, -EINVAL); |
1459 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1460 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1461 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1462 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1463 | |
fd38203a | 1464 | s->time.next = usec; |
2576a19e | 1465 | |
0cc1125a | 1466 | source_set_pending(s, false); |
fd38203a | 1467 | |
6a0f1f6d LP |
1468 | d = event_get_clock_data(s->event, s->type); |
1469 | assert(d); | |
1470 | ||
1471 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1472 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a LP |
1473 | |
1474 | return 0; | |
1475 | } | |
1476 | ||
f7262a9f | 1477 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1478 | assert_return(s, -EINVAL); |
1479 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1480 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1481 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1482 | ||
1483 | *usec = s->time.accuracy; | |
1484 | return 0; | |
1485 | } | |
1486 | ||
f7262a9f | 1487 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1488 | struct clock_data *d; |
1489 | ||
305f78bf LP |
1490 | assert_return(s, -EINVAL); |
1491 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1492 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1493 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1494 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1495 | |
1496 | if (usec == 0) | |
1497 | usec = DEFAULT_ACCURACY_USEC; | |
1498 | ||
eaa3cbef LP |
1499 | s->time.accuracy = usec; |
1500 | ||
2576a19e LP |
1501 | source_set_pending(s, false); |
1502 | ||
6a0f1f6d LP |
1503 | d = event_get_clock_data(s->event, s->type); |
1504 | assert(d); | |
1505 | ||
1506 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
1507 | ||
1508 | return 0; | |
1509 | } | |
1510 | ||
1511 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1512 | assert_return(s, -EINVAL); | |
1513 | assert_return(clock, -EINVAL); | |
1514 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1515 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1516 | |
6a0f1f6d | 1517 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1518 | return 0; |
1519 | } | |
1520 | ||
f7262a9f | 1521 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1522 | assert_return(s, -EINVAL); |
1523 | assert_return(pid, -EINVAL); | |
1524 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1525 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1526 | ||
1527 | *pid = s->child.pid; | |
1528 | return 0; | |
1529 | } | |
1530 | ||
718db961 | 1531 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1532 | int r; |
1533 | ||
da7e457c | 1534 | assert_return(s, -EINVAL); |
6203e07a | 1535 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1536 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1537 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1538 | |
1539 | if (s->prepare == callback) | |
1540 | return 0; | |
1541 | ||
1542 | if (callback && s->prepare) { | |
1543 | s->prepare = callback; | |
1544 | return 0; | |
1545 | } | |
1546 | ||
1547 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1548 | if (r < 0) | |
1549 | return r; | |
1550 | ||
1551 | s->prepare = callback; | |
1552 | ||
1553 | if (callback) { | |
1554 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1555 | if (r < 0) | |
1556 | return r; | |
1557 | } else | |
1558 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1559 | ||
1560 | return 0; | |
1561 | } | |
1562 | ||
f7262a9f | 1563 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1564 | assert_return(s, NULL); |
fd38203a LP |
1565 | |
1566 | return s->userdata; | |
1567 | } | |
1568 | ||
8f726607 LP |
1569 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1570 | void *ret; | |
1571 | ||
1572 | assert_return(s, NULL); | |
1573 | ||
1574 | ret = s->userdata; | |
1575 | s->userdata = userdata; | |
1576 | ||
1577 | return ret; | |
1578 | } | |
1579 | ||
c2ba3ad6 LP |
1580 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1581 | usec_t c; | |
1582 | assert(e); | |
1583 | assert(a <= b); | |
1584 | ||
1585 | if (a <= 0) | |
1586 | return 0; | |
1587 | ||
1588 | if (b <= a + 1) | |
1589 | return a; | |
1590 | ||
1591 | /* | |
1592 | Find a good time to wake up again between times a and b. We | |
1593 | have two goals here: | |
1594 | ||
1595 | a) We want to wake up as seldom as possible, hence prefer | |
1596 | later times over earlier times. | |
1597 | ||
1598 | b) But if we have to wake up, then let's make sure to | |
1599 | dispatch as much as possible on the entire system. | |
1600 | ||
1601 | We implement this by waking up everywhere at the same time | |
850516e0 | 1602 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1603 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1604 | then we try to find the same spot in every 10s, then 1s and |
1605 | then 250ms step. Otherwise, we pick the last possible time | |
1606 | to wake up. | |
c2ba3ad6 LP |
1607 | */ |
1608 | ||
850516e0 LP |
1609 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1610 | if (c >= b) { | |
1611 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1612 | return b; | |
1613 | ||
1614 | c -= USEC_PER_MINUTE; | |
1615 | } | |
1616 | ||
ba276c81 LP |
1617 | if (c >= a) |
1618 | return c; | |
1619 | ||
1620 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1621 | if (c >= b) { | |
1622 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1623 | return b; | |
1624 | ||
1625 | c -= USEC_PER_SEC*10; | |
1626 | } | |
1627 | ||
850516e0 LP |
1628 | if (c >= a) |
1629 | return c; | |
1630 | ||
1631 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1632 | if (c >= b) { |
1633 | if (_unlikely_(c < USEC_PER_SEC)) | |
1634 | return b; | |
1635 | ||
1636 | c -= USEC_PER_SEC; | |
1637 | } | |
1638 | ||
1639 | if (c >= a) | |
1640 | return c; | |
1641 | ||
1642 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1643 | if (c >= b) { | |
1644 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1645 | return b; | |
1646 | ||
1647 | c -= USEC_PER_MSEC*250; | |
1648 | } | |
1649 | ||
1650 | if (c >= a) | |
1651 | return c; | |
1652 | ||
1653 | return b; | |
1654 | } | |
1655 | ||
fd38203a LP |
1656 | static int event_arm_timer( |
1657 | sd_event *e, | |
6a0f1f6d | 1658 | struct clock_data *d) { |
fd38203a LP |
1659 | |
1660 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1661 | sd_event_source *a, *b; |
1662 | usec_t t; | |
fd38203a LP |
1663 | int r; |
1664 | ||
cde93897 | 1665 | assert(e); |
6a0f1f6d | 1666 | assert(d); |
fd38203a | 1667 | |
6a0f1f6d | 1668 | a = prioq_peek(d->earliest); |
72aedc1e LP |
1669 | if (!a || a->enabled == SD_EVENT_OFF) { |
1670 | ||
6a0f1f6d | 1671 | if (d->fd < 0) |
c57b5ca3 LP |
1672 | return 0; |
1673 | ||
6a0f1f6d | 1674 | if (d->next == (usec_t) -1) |
72aedc1e LP |
1675 | return 0; |
1676 | ||
1677 | /* disarm */ | |
6a0f1f6d | 1678 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1679 | if (r < 0) |
1680 | return r; | |
1681 | ||
6a0f1f6d | 1682 | d->next = (usec_t) -1; |
fd38203a | 1683 | return 0; |
72aedc1e | 1684 | } |
fd38203a | 1685 | |
6a0f1f6d | 1686 | b = prioq_peek(d->latest); |
baf76283 | 1687 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1688 | |
1689 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
6a0f1f6d | 1690 | if (d->next == t) |
fd38203a LP |
1691 | return 0; |
1692 | ||
6a0f1f6d | 1693 | assert_se(d->fd >= 0); |
fd38203a | 1694 | |
c2ba3ad6 | 1695 | if (t == 0) { |
fd38203a LP |
1696 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1697 | its.it_value.tv_sec = 0; | |
1698 | its.it_value.tv_nsec = 1; | |
1699 | } else | |
c2ba3ad6 | 1700 | timespec_store(&its.it_value, t); |
fd38203a | 1701 | |
6a0f1f6d | 1702 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 1703 | if (r < 0) |
cde93897 | 1704 | return -errno; |
fd38203a | 1705 | |
6a0f1f6d | 1706 | d->next = t; |
fd38203a LP |
1707 | return 0; |
1708 | } | |
1709 | ||
9a800b56 | 1710 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
1711 | assert(e); |
1712 | assert(s); | |
1713 | assert(s->type == SOURCE_IO); | |
1714 | ||
9a800b56 LP |
1715 | /* If the event source was already pending, we just OR in the |
1716 | * new revents, otherwise we reset the value. The ORing is | |
1717 | * necessary to handle EPOLLONESHOT events properly where | |
1718 | * readability might happen independently of writability, and | |
1719 | * we need to keep track of both */ | |
1720 | ||
1721 | if (s->pending) | |
1722 | s->io.revents |= revents; | |
1723 | else | |
1724 | s->io.revents = revents; | |
fd38203a | 1725 | |
fd38203a LP |
1726 | return source_set_pending(s, true); |
1727 | } | |
1728 | ||
72aedc1e | 1729 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
1730 | uint64_t x; |
1731 | ssize_t ss; | |
1732 | ||
1733 | assert(e); | |
da7e457c | 1734 | assert(fd >= 0); |
72aedc1e | 1735 | |
305f78bf | 1736 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1737 | |
1738 | ss = read(fd, &x, sizeof(x)); | |
1739 | if (ss < 0) { | |
1740 | if (errno == EAGAIN || errno == EINTR) | |
1741 | return 0; | |
1742 | ||
1743 | return -errno; | |
1744 | } | |
1745 | ||
8d35dae7 | 1746 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
1747 | return -EIO; |
1748 | ||
cde93897 LP |
1749 | if (next) |
1750 | *next = (usec_t) -1; | |
72aedc1e | 1751 | |
fd38203a LP |
1752 | return 0; |
1753 | } | |
1754 | ||
305f78bf LP |
1755 | static int process_timer( |
1756 | sd_event *e, | |
1757 | usec_t n, | |
6a0f1f6d | 1758 | struct clock_data *d) { |
305f78bf | 1759 | |
fd38203a LP |
1760 | sd_event_source *s; |
1761 | int r; | |
1762 | ||
1763 | assert(e); | |
6a0f1f6d | 1764 | assert(d); |
fd38203a LP |
1765 | |
1766 | for (;;) { | |
6a0f1f6d | 1767 | s = prioq_peek(d->earliest); |
fd38203a LP |
1768 | if (!s || |
1769 | s->time.next > n || | |
baf76283 | 1770 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1771 | s->pending) |
1772 | break; | |
1773 | ||
1774 | r = source_set_pending(s, true); | |
1775 | if (r < 0) | |
1776 | return r; | |
1777 | ||
6a0f1f6d LP |
1778 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
1779 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a LP |
1780 | } |
1781 | ||
1782 | return 0; | |
1783 | } | |
1784 | ||
1785 | static int process_child(sd_event *e) { | |
1786 | sd_event_source *s; | |
1787 | Iterator i; | |
1788 | int r; | |
1789 | ||
1790 | assert(e); | |
1791 | ||
c2ba3ad6 LP |
1792 | e->need_process_child = false; |
1793 | ||
fd38203a LP |
1794 | /* |
1795 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1796 | + WNOHANG for each PID we wait for, instead of using | |
1797 | P_ALL. This is because we only want to get child | |
1798 | information of very specific child processes, and not all | |
1799 | of them. We might not have processed the SIGCHLD even of a | |
1800 | previous invocation and we don't want to maintain a | |
1801 | unbounded *per-child* event queue, hence we really don't | |
1802 | want anything flushed out of the kernel's queue that we | |
1803 | don't care about. Since this is O(n) this means that if you | |
1804 | have a lot of processes you probably want to handle SIGCHLD | |
1805 | yourself. | |
08cd1552 LP |
1806 | |
1807 | We do not reap the children here (by using WNOWAIT), this | |
1808 | is only done after the event source is dispatched so that | |
1809 | the callback still sees the process as a zombie. | |
fd38203a LP |
1810 | */ |
1811 | ||
1812 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1813 | assert(s->type == SOURCE_CHILD); | |
1814 | ||
1815 | if (s->pending) | |
1816 | continue; | |
1817 | ||
baf76283 | 1818 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1819 | continue; |
1820 | ||
1821 | zero(s->child.siginfo); | |
08cd1552 LP |
1822 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
1823 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
1824 | if (r < 0) |
1825 | return -errno; | |
1826 | ||
1827 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
1828 | bool zombie = |
1829 | s->child.siginfo.si_code == CLD_EXITED || | |
1830 | s->child.siginfo.si_code == CLD_KILLED || | |
1831 | s->child.siginfo.si_code == CLD_DUMPED; | |
1832 | ||
1833 | if (!zombie && (s->child.options & WEXITED)) { | |
1834 | /* If the child isn't dead then let's | |
1835 | * immediately remove the state change | |
1836 | * from the queue, since there's no | |
1837 | * benefit in leaving it queued */ | |
1838 | ||
1839 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
1840 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
1841 | } | |
1842 | ||
fd38203a LP |
1843 | r = source_set_pending(s, true); |
1844 | if (r < 0) | |
1845 | return r; | |
1846 | } | |
1847 | } | |
1848 | ||
fd38203a LP |
1849 | return 0; |
1850 | } | |
1851 | ||
1852 | static int process_signal(sd_event *e, uint32_t events) { | |
fd38203a | 1853 | bool read_one = false; |
fd38203a LP |
1854 | int r; |
1855 | ||
da7e457c | 1856 | assert(e); |
0eb2e0e3 ZJS |
1857 | assert(e->signal_sources); |
1858 | ||
305f78bf | 1859 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1860 | |
1861 | for (;;) { | |
0eb2e0e3 ZJS |
1862 | struct signalfd_siginfo si; |
1863 | ssize_t ss; | |
fd38203a LP |
1864 | sd_event_source *s; |
1865 | ||
1866 | ss = read(e->signal_fd, &si, sizeof(si)); | |
1867 | if (ss < 0) { | |
1868 | if (errno == EAGAIN || errno == EINTR) | |
1869 | return read_one; | |
1870 | ||
1871 | return -errno; | |
1872 | } | |
1873 | ||
8d35dae7 | 1874 | if (_unlikely_(ss != sizeof(si))) |
fd38203a LP |
1875 | return -EIO; |
1876 | ||
1877 | read_one = true; | |
1878 | ||
0eb2e0e3 | 1879 | s = e->signal_sources[si.ssi_signo]; |
fd38203a LP |
1880 | if (si.ssi_signo == SIGCHLD) { |
1881 | r = process_child(e); | |
1882 | if (r < 0) | |
1883 | return r; | |
0eb2e0e3 | 1884 | if (r > 0 || !s) |
fd38203a | 1885 | continue; |
0eb2e0e3 | 1886 | } else |
fd38203a LP |
1887 | if (!s) |
1888 | return -EIO; | |
fd38203a LP |
1889 | |
1890 | s->signal.siginfo = si; | |
1891 | r = source_set_pending(s, true); | |
1892 | if (r < 0) | |
1893 | return r; | |
1894 | } | |
fd38203a LP |
1895 | } |
1896 | ||
1897 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 1898 | int r = 0; |
fd38203a LP |
1899 | |
1900 | assert(s); | |
6203e07a | 1901 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 1902 | |
6203e07a | 1903 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
1904 | r = source_set_pending(s, false); |
1905 | if (r < 0) | |
1906 | return r; | |
1907 | } | |
fd38203a | 1908 | |
6e9feda3 LP |
1909 | if (s->type != SOURCE_POST) { |
1910 | sd_event_source *z; | |
1911 | Iterator i; | |
1912 | ||
1913 | /* If we execute a non-post source, let's mark all | |
1914 | * post sources as pending */ | |
1915 | ||
1916 | SET_FOREACH(z, s->event->post_sources, i) { | |
1917 | if (z->enabled == SD_EVENT_OFF) | |
1918 | continue; | |
1919 | ||
1920 | r = source_set_pending(z, true); | |
1921 | if (r < 0) | |
1922 | return r; | |
1923 | } | |
1924 | } | |
1925 | ||
baf76283 LP |
1926 | if (s->enabled == SD_EVENT_ONESHOT) { |
1927 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
1928 | if (r < 0) |
1929 | return r; | |
1930 | } | |
1931 | ||
12179984 | 1932 | s->dispatching = true; |
b7484e2a | 1933 | |
fd38203a LP |
1934 | switch (s->type) { |
1935 | ||
1936 | case SOURCE_IO: | |
1937 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
1938 | break; | |
1939 | ||
6a0f1f6d LP |
1940 | case SOURCE_TIME_REALTIME: |
1941 | case SOURCE_TIME_MONOTONIC: | |
1942 | case SOURCE_TIME_REALTIME_ALARM: | |
1943 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
1944 | r = s->time.callback(s, s->time.next, s->userdata); |
1945 | break; | |
1946 | ||
1947 | case SOURCE_SIGNAL: | |
1948 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
1949 | break; | |
1950 | ||
08cd1552 LP |
1951 | case SOURCE_CHILD: { |
1952 | bool zombie; | |
1953 | ||
1954 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
1955 | s->child.siginfo.si_code == CLD_KILLED || | |
1956 | s->child.siginfo.si_code == CLD_DUMPED; | |
1957 | ||
fd38203a | 1958 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
1959 | |
1960 | /* Now, reap the PID for good. */ | |
1961 | if (zombie) | |
1962 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
1963 | ||
fd38203a | 1964 | break; |
08cd1552 | 1965 | } |
fd38203a LP |
1966 | |
1967 | case SOURCE_DEFER: | |
1968 | r = s->defer.callback(s, s->userdata); | |
1969 | break; | |
da7e457c | 1970 | |
6e9feda3 LP |
1971 | case SOURCE_POST: |
1972 | r = s->post.callback(s, s->userdata); | |
1973 | break; | |
1974 | ||
6203e07a LP |
1975 | case SOURCE_EXIT: |
1976 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 1977 | break; |
9d3e3aa5 LP |
1978 | |
1979 | case SOURCE_WATCHDOG: | |
1980 | assert_not_reached("Wut? I shouldn't exist."); | |
fd38203a LP |
1981 | } |
1982 | ||
12179984 LP |
1983 | s->dispatching = false; |
1984 | ||
1985 | if (r < 0) | |
6203e07a | 1986 | log_debug("Event source %p returned error, disabling: %s", s, strerror(-r)); |
12179984 LP |
1987 | |
1988 | if (s->n_ref == 0) | |
1989 | source_free(s); | |
1990 | else if (r < 0) | |
6203e07a | 1991 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 1992 | |
6203e07a | 1993 | return 1; |
fd38203a LP |
1994 | } |
1995 | ||
1996 | static int event_prepare(sd_event *e) { | |
1997 | int r; | |
1998 | ||
1999 | assert(e); | |
2000 | ||
2001 | for (;;) { | |
2002 | sd_event_source *s; | |
2003 | ||
2004 | s = prioq_peek(e->prepare); | |
baf76283 | 2005 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2006 | break; |
2007 | ||
2008 | s->prepare_iteration = e->iteration; | |
2009 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2010 | if (r < 0) | |
2011 | return r; | |
2012 | ||
2013 | assert(s->prepare); | |
12179984 LP |
2014 | |
2015 | s->dispatching = true; | |
fd38203a | 2016 | r = s->prepare(s, s->userdata); |
12179984 LP |
2017 | s->dispatching = false; |
2018 | ||
fd38203a | 2019 | if (r < 0) |
12179984 | 2020 | log_debug("Prepare callback of event source %p returned error, disabling: %s", s, strerror(-r)); |
fd38203a | 2021 | |
12179984 LP |
2022 | if (s->n_ref == 0) |
2023 | source_free(s); | |
2024 | else if (r < 0) | |
2025 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2026 | } |
2027 | ||
2028 | return 0; | |
2029 | } | |
2030 | ||
6203e07a | 2031 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2032 | sd_event_source *p; |
2033 | int r; | |
2034 | ||
2035 | assert(e); | |
2036 | ||
6203e07a | 2037 | p = prioq_peek(e->exit); |
baf76283 | 2038 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2039 | e->state = SD_EVENT_FINISHED; |
2040 | return 0; | |
2041 | } | |
2042 | ||
2043 | sd_event_ref(e); | |
2044 | e->iteration++; | |
6203e07a | 2045 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2046 | |
2047 | r = source_dispatch(p); | |
2048 | ||
2049 | e->state = SD_EVENT_PASSIVE; | |
2050 | sd_event_unref(e); | |
2051 | ||
2052 | return r; | |
2053 | } | |
2054 | ||
c2ba3ad6 LP |
2055 | static sd_event_source* event_next_pending(sd_event *e) { |
2056 | sd_event_source *p; | |
2057 | ||
da7e457c LP |
2058 | assert(e); |
2059 | ||
c2ba3ad6 LP |
2060 | p = prioq_peek(e->pending); |
2061 | if (!p) | |
2062 | return NULL; | |
2063 | ||
baf76283 | 2064 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2065 | return NULL; |
2066 | ||
2067 | return p; | |
2068 | } | |
2069 | ||
cde93897 LP |
2070 | static int arm_watchdog(sd_event *e) { |
2071 | struct itimerspec its = {}; | |
2072 | usec_t t; | |
2073 | int r; | |
2074 | ||
2075 | assert(e); | |
2076 | assert(e->watchdog_fd >= 0); | |
2077 | ||
2078 | t = sleep_between(e, | |
2079 | e->watchdog_last + (e->watchdog_period / 2), | |
2080 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2081 | ||
2082 | timespec_store(&its.it_value, t); | |
2083 | ||
2084 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
2085 | if (r < 0) | |
2086 | return -errno; | |
2087 | ||
2088 | return 0; | |
2089 | } | |
2090 | ||
2091 | static int process_watchdog(sd_event *e) { | |
2092 | assert(e); | |
2093 | ||
2094 | if (!e->watchdog) | |
2095 | return 0; | |
2096 | ||
2097 | /* Don't notify watchdog too often */ | |
2098 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2099 | return 0; | |
2100 | ||
2101 | sd_notify(false, "WATCHDOG=1"); | |
2102 | e->watchdog_last = e->timestamp.monotonic; | |
2103 | ||
2104 | return arm_watchdog(e); | |
2105 | } | |
2106 | ||
f7262a9f | 2107 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
15b38f93 LP |
2108 | struct epoll_event *ev_queue; |
2109 | unsigned ev_queue_max; | |
fd38203a | 2110 | sd_event_source *p; |
305f78bf | 2111 | int r, i, m; |
fd38203a | 2112 | |
da7e457c LP |
2113 | assert_return(e, -EINVAL); |
2114 | assert_return(!event_pid_changed(e), -ECHILD); | |
2115 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2116 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2117 | ||
6203e07a LP |
2118 | if (e->exit_requested) |
2119 | return dispatch_exit(e); | |
fd38203a | 2120 | |
da7e457c | 2121 | sd_event_ref(e); |
fd38203a | 2122 | e->iteration++; |
da7e457c | 2123 | e->state = SD_EVENT_RUNNING; |
fd38203a LP |
2124 | |
2125 | r = event_prepare(e); | |
2126 | if (r < 0) | |
da7e457c | 2127 | goto finish; |
fd38203a | 2128 | |
6a0f1f6d LP |
2129 | r = event_arm_timer(e, &e->realtime); |
2130 | if (r < 0) | |
2131 | goto finish; | |
2132 | ||
2133 | r = event_arm_timer(e, &e->monotonic); | |
2134 | if (r < 0) | |
2135 | goto finish; | |
2136 | ||
2137 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 LP |
2138 | if (r < 0) |
2139 | goto finish; | |
fd38203a | 2140 | |
6a0f1f6d | 2141 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 LP |
2142 | if (r < 0) |
2143 | goto finish; | |
fd38203a | 2144 | |
1b5995b0 LP |
2145 | if (event_next_pending(e) || e->need_process_child) |
2146 | timeout = 0; | |
6a0f1f6d | 2147 | |
15b38f93 LP |
2148 | ev_queue_max = CLAMP(e->n_sources, 1U, EPOLL_QUEUE_MAX); |
2149 | ev_queue = newa(struct epoll_event, ev_queue_max); | |
fd38203a | 2150 | |
15b38f93 | 2151 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2152 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2153 | if (m < 0) { |
ff003106 | 2154 | r = errno == EAGAIN || errno == EINTR ? 1 : -errno; |
da7e457c LP |
2155 | goto finish; |
2156 | } | |
fd38203a | 2157 | |
46e8c825 | 2158 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2159 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2160 | |
2161 | for (i = 0; i < m; i++) { | |
2162 | ||
6a0f1f6d LP |
2163 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME)) |
2164 | r = flush_timer(e, e->realtime.fd, ev_queue[i].events, &e->realtime.next); | |
2165 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_MONOTONIC)) | |
2166 | r = flush_timer(e, e->monotonic.fd, ev_queue[i].events, &e->monotonic.next); | |
2167 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME_ALARM)) | |
2168 | r = flush_timer(e, e->realtime_alarm.fd, ev_queue[i].events, &e->realtime_alarm.next); | |
2169 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_BOOTTIME_ALARM)) | |
2170 | r = flush_timer(e, e->boottime_alarm.fd, ev_queue[i].events, &e->boottime_alarm.next); | |
fd38203a LP |
2171 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) |
2172 | r = process_signal(e, ev_queue[i].events); | |
79e16ce3 | 2173 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2174 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
fd38203a LP |
2175 | else |
2176 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2177 | ||
2178 | if (r < 0) | |
da7e457c | 2179 | goto finish; |
fd38203a LP |
2180 | } |
2181 | ||
cde93897 LP |
2182 | r = process_watchdog(e); |
2183 | if (r < 0) | |
2184 | goto finish; | |
2185 | ||
6a0f1f6d LP |
2186 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2187 | if (r < 0) | |
2188 | goto finish; | |
2189 | ||
2190 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); | |
2191 | if (r < 0) | |
2192 | goto finish; | |
2193 | ||
2194 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2195 | if (r < 0) |
da7e457c | 2196 | goto finish; |
fd38203a | 2197 | |
6a0f1f6d | 2198 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2199 | if (r < 0) |
da7e457c | 2200 | goto finish; |
fd38203a | 2201 | |
c2ba3ad6 | 2202 | if (e->need_process_child) { |
fd38203a LP |
2203 | r = process_child(e); |
2204 | if (r < 0) | |
da7e457c | 2205 | goto finish; |
fd38203a LP |
2206 | } |
2207 | ||
c2ba3ad6 | 2208 | p = event_next_pending(e); |
da7e457c | 2209 | if (!p) { |
f98a58fe | 2210 | r = 1; |
da7e457c LP |
2211 | goto finish; |
2212 | } | |
2213 | ||
2214 | r = source_dispatch(p); | |
fd38203a | 2215 | |
da7e457c LP |
2216 | finish: |
2217 | e->state = SD_EVENT_PASSIVE; | |
2218 | sd_event_unref(e); | |
2219 | ||
2220 | return r; | |
fd38203a LP |
2221 | } |
2222 | ||
f7262a9f | 2223 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2224 | int r; |
2225 | ||
da7e457c LP |
2226 | assert_return(e, -EINVAL); |
2227 | assert_return(!event_pid_changed(e), -ECHILD); | |
2228 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2229 | ||
2230 | sd_event_ref(e); | |
fd38203a | 2231 | |
da7e457c | 2232 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2233 | r = sd_event_run(e, (uint64_t) -1); |
2234 | if (r < 0) | |
da7e457c | 2235 | goto finish; |
fd38203a LP |
2236 | } |
2237 | ||
6203e07a | 2238 | r = e->exit_code; |
da7e457c LP |
2239 | |
2240 | finish: | |
2241 | sd_event_unref(e); | |
2242 | return r; | |
fd38203a LP |
2243 | } |
2244 | ||
f7262a9f | 2245 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2246 | assert_return(e, -EINVAL); |
2247 | assert_return(!event_pid_changed(e), -ECHILD); | |
2248 | ||
2249 | return e->state; | |
2250 | } | |
2251 | ||
6203e07a | 2252 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2253 | assert_return(e, -EINVAL); |
6203e07a | 2254 | assert_return(code, -EINVAL); |
da7e457c | 2255 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2256 | |
6203e07a LP |
2257 | if (!e->exit_requested) |
2258 | return -ENODATA; | |
2259 | ||
2260 | *code = e->exit_code; | |
2261 | return 0; | |
fd38203a LP |
2262 | } |
2263 | ||
6203e07a | 2264 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2265 | assert_return(e, -EINVAL); |
2266 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2267 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2268 | |
6203e07a LP |
2269 | e->exit_requested = true; |
2270 | e->exit_code = code; | |
2271 | ||
fd38203a LP |
2272 | return 0; |
2273 | } | |
46e8c825 | 2274 | |
6a0f1f6d | 2275 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2276 | assert_return(e, -EINVAL); |
2277 | assert_return(usec, -EINVAL); | |
46e8c825 LP |
2278 | assert_return(!event_pid_changed(e), -ECHILD); |
2279 | ||
6a0f1f6d LP |
2280 | /* If we haven't run yet, just get the actual time */ |
2281 | if (!dual_timestamp_is_set(&e->timestamp)) | |
2282 | return -ENODATA; | |
46e8c825 | 2283 | |
6a0f1f6d LP |
2284 | switch (clock) { |
2285 | ||
2286 | case CLOCK_REALTIME: | |
2287 | case CLOCK_REALTIME_ALARM: | |
2288 | *usec = e->timestamp.realtime; | |
2289 | break; | |
2290 | ||
2291 | case CLOCK_MONOTONIC: | |
2292 | *usec = e->timestamp.monotonic; | |
2293 | break; | |
2294 | ||
2295 | case CLOCK_BOOTTIME_ALARM: | |
2296 | *usec = e->timestamp_boottime; | |
2297 | break; | |
2298 | } | |
46e8c825 | 2299 | |
46e8c825 LP |
2300 | return 0; |
2301 | } | |
afc6adb5 LP |
2302 | |
2303 | _public_ int sd_event_default(sd_event **ret) { | |
2304 | ||
ec202eae | 2305 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2306 | sd_event *e = NULL; |
afc6adb5 LP |
2307 | int r; |
2308 | ||
2309 | if (!ret) | |
2310 | return !!default_event; | |
2311 | ||
2312 | if (default_event) { | |
2313 | *ret = sd_event_ref(default_event); | |
2314 | return 0; | |
2315 | } | |
2316 | ||
2317 | r = sd_event_new(&e); | |
2318 | if (r < 0) | |
2319 | return r; | |
2320 | ||
2321 | e->default_event_ptr = &default_event; | |
2322 | e->tid = gettid(); | |
2323 | default_event = e; | |
2324 | ||
2325 | *ret = e; | |
2326 | return 1; | |
2327 | } | |
2328 | ||
2329 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2330 | assert_return(e, -EINVAL); | |
2331 | assert_return(tid, -EINVAL); | |
76b54375 | 2332 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2333 | |
76b54375 LP |
2334 | if (e->tid != 0) { |
2335 | *tid = e->tid; | |
2336 | return 0; | |
2337 | } | |
2338 | ||
2339 | return -ENXIO; | |
afc6adb5 | 2340 | } |
cde93897 LP |
2341 | |
2342 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2343 | int r; | |
2344 | ||
2345 | assert_return(e, -EINVAL); | |
8f726607 | 2346 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2347 | |
2348 | if (e->watchdog == !!b) | |
2349 | return e->watchdog; | |
2350 | ||
2351 | if (b) { | |
2352 | struct epoll_event ev = {}; | |
cde93897 | 2353 | |
09812eb7 LP |
2354 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2355 | if (r <= 0) | |
cde93897 | 2356 | return r; |
cde93897 LP |
2357 | |
2358 | /* Issue first ping immediately */ | |
2359 | sd_notify(false, "WATCHDOG=1"); | |
2360 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2361 | ||
2362 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2363 | if (e->watchdog_fd < 0) | |
2364 | return -errno; | |
2365 | ||
2366 | r = arm_watchdog(e); | |
2367 | if (r < 0) | |
2368 | goto fail; | |
2369 | ||
2370 | ev.events = EPOLLIN; | |
2371 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2372 | ||
2373 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2374 | if (r < 0) { | |
2375 | r = -errno; | |
2376 | goto fail; | |
2377 | } | |
2378 | ||
2379 | } else { | |
2380 | if (e->watchdog_fd >= 0) { | |
2381 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2382 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2383 | } |
2384 | } | |
2385 | ||
2386 | e->watchdog = !!b; | |
2387 | return e->watchdog; | |
2388 | ||
2389 | fail: | |
03e334a1 | 2390 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2391 | return r; |
2392 | } | |
8f726607 LP |
2393 | |
2394 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2395 | assert_return(e, -EINVAL); | |
2396 | assert_return(!event_pid_changed(e), -ECHILD); | |
2397 | ||
2398 | return e->watchdog; | |
2399 | } |