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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 | ||
52444dc4 LP |
736 | static void initialize_perturb(sd_event *e) { |
737 | sd_id128_t bootid = {}; | |
738 | ||
739 | /* When we sleep for longer, we try to realign the wakeup to | |
740 | the same time wihtin each minute/second/250ms, so that | |
741 | events all across the system can be coalesced into a single | |
742 | CPU wakeup. However, let's take some system-specific | |
743 | randomness for this value, so that in a network of systems | |
744 | with synced clocks timer events are distributed a | |
745 | bit. Here, we calculate a perturbation usec offset from the | |
746 | boot ID. */ | |
747 | ||
748 | if (_likely_(e->perturb != (usec_t) -1)) | |
749 | return; | |
750 | ||
751 | if (sd_id128_get_boot(&bootid) >= 0) | |
752 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
753 | } | |
754 | ||
fd38203a LP |
755 | static int event_setup_timer_fd( |
756 | sd_event *e, | |
6a0f1f6d LP |
757 | struct clock_data *d, |
758 | clockid_t clock) { | |
fd38203a LP |
759 | |
760 | struct epoll_event ev = {}; | |
761 | int r, fd; | |
762 | ||
763 | assert(e); | |
6a0f1f6d | 764 | assert(d); |
fd38203a | 765 | |
6a0f1f6d | 766 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
767 | return 0; |
768 | ||
6a0f1f6d | 769 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
770 | if (fd < 0) |
771 | return -errno; | |
772 | ||
773 | ev.events = EPOLLIN; | |
6a0f1f6d | 774 | ev.data.ptr = INT_TO_PTR(clock_to_event_source_type(clock)); |
fd38203a LP |
775 | |
776 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
777 | if (r < 0) { | |
03e334a1 | 778 | safe_close(fd); |
fd38203a LP |
779 | return -errno; |
780 | } | |
781 | ||
6a0f1f6d | 782 | d->fd = fd; |
fd38203a LP |
783 | return 0; |
784 | } | |
785 | ||
6a0f1f6d | 786 | _public_ int sd_event_add_time( |
fd38203a | 787 | sd_event *e, |
151b9b96 | 788 | sd_event_source **ret, |
6a0f1f6d | 789 | clockid_t clock, |
fd38203a | 790 | uint64_t usec, |
c2ba3ad6 | 791 | uint64_t accuracy, |
718db961 | 792 | sd_event_time_handler_t callback, |
151b9b96 | 793 | void *userdata) { |
fd38203a | 794 | |
6a0f1f6d | 795 | EventSourceType type; |
fd38203a | 796 | sd_event_source *s; |
6a0f1f6d | 797 | struct clock_data *d; |
fd38203a LP |
798 | int r; |
799 | ||
305f78bf | 800 | assert_return(e, -EINVAL); |
305f78bf LP |
801 | assert_return(ret, -EINVAL); |
802 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
803 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 804 | assert_return(callback, -EINVAL); |
da7e457c | 805 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 806 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 807 | |
6a0f1f6d LP |
808 | type = clock_to_event_source_type(clock); |
809 | assert_return(type >= 0, -ENOTSUP); | |
810 | ||
811 | d = event_get_clock_data(e, type); | |
812 | assert(d); | |
c2ba3ad6 | 813 | |
6a0f1f6d LP |
814 | if (!d->earliest) { |
815 | d->earliest = prioq_new(earliest_time_prioq_compare); | |
816 | if (!d->earliest) | |
c2ba3ad6 LP |
817 | return -ENOMEM; |
818 | } | |
fd38203a | 819 | |
6a0f1f6d LP |
820 | if (!d->latest) { |
821 | d->latest = prioq_new(latest_time_prioq_compare); | |
822 | if (!d->latest) | |
fd38203a LP |
823 | return -ENOMEM; |
824 | } | |
825 | ||
6a0f1f6d LP |
826 | if (d->fd < 0) { |
827 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
828 | if (r < 0) |
829 | return r; | |
830 | } | |
831 | ||
832 | s = source_new(e, type); | |
833 | if (!s) | |
834 | return -ENOMEM; | |
835 | ||
836 | s->time.next = usec; | |
c2ba3ad6 | 837 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 838 | s->time.callback = callback; |
da7e457c | 839 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 840 | s->userdata = userdata; |
baf76283 | 841 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 842 | |
6a0f1f6d | 843 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
844 | if (r < 0) |
845 | goto fail; | |
846 | ||
6a0f1f6d | 847 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
848 | if (r < 0) |
849 | goto fail; | |
fd38203a LP |
850 | |
851 | *ret = s; | |
852 | return 0; | |
c2ba3ad6 LP |
853 | |
854 | fail: | |
855 | source_free(s); | |
856 | return r; | |
fd38203a LP |
857 | } |
858 | ||
fd38203a LP |
859 | static int event_update_signal_fd(sd_event *e) { |
860 | struct epoll_event ev = {}; | |
861 | bool add_to_epoll; | |
862 | int r; | |
863 | ||
864 | assert(e); | |
865 | ||
866 | add_to_epoll = e->signal_fd < 0; | |
867 | ||
868 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
869 | if (r < 0) | |
870 | return -errno; | |
871 | ||
872 | e->signal_fd = r; | |
873 | ||
874 | if (!add_to_epoll) | |
875 | return 0; | |
876 | ||
877 | ev.events = EPOLLIN; | |
878 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
879 | ||
880 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
881 | if (r < 0) { | |
03e334a1 | 882 | e->signal_fd = safe_close(e->signal_fd); |
fd38203a LP |
883 | return -errno; |
884 | } | |
885 | ||
886 | return 0; | |
887 | } | |
888 | ||
59bc1fd7 LP |
889 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
890 | assert(s); | |
891 | ||
892 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
893 | } | |
894 | ||
f7262a9f | 895 | _public_ int sd_event_add_signal( |
305f78bf | 896 | sd_event *e, |
151b9b96 | 897 | sd_event_source **ret, |
305f78bf | 898 | int sig, |
718db961 | 899 | sd_event_signal_handler_t callback, |
151b9b96 | 900 | void *userdata) { |
305f78bf | 901 | |
fd38203a | 902 | sd_event_source *s; |
3022d74b | 903 | sigset_t ss; |
fd38203a LP |
904 | int r; |
905 | ||
305f78bf LP |
906 | assert_return(e, -EINVAL); |
907 | assert_return(sig > 0, -EINVAL); | |
908 | assert_return(sig < _NSIG, -EINVAL); | |
305f78bf | 909 | assert_return(ret, -EINVAL); |
da7e457c | 910 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 911 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 912 | |
59bc1fd7 LP |
913 | if (!callback) |
914 | callback = signal_exit_callback; | |
915 | ||
3022d74b LP |
916 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
917 | if (r < 0) | |
918 | return -errno; | |
919 | ||
920 | if (!sigismember(&ss, sig)) | |
921 | return -EBUSY; | |
922 | ||
fd38203a LP |
923 | if (!e->signal_sources) { |
924 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
925 | if (!e->signal_sources) | |
926 | return -ENOMEM; | |
927 | } else if (e->signal_sources[sig]) | |
928 | return -EBUSY; | |
929 | ||
930 | s = source_new(e, SOURCE_SIGNAL); | |
931 | if (!s) | |
932 | return -ENOMEM; | |
933 | ||
934 | s->signal.sig = sig; | |
935 | s->signal.callback = callback; | |
936 | s->userdata = userdata; | |
baf76283 | 937 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
938 | |
939 | e->signal_sources[sig] = s; | |
940 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
941 | ||
baf76283 | 942 | if (sig != SIGCHLD || e->n_enabled_child_sources == 0) { |
fd38203a LP |
943 | r = event_update_signal_fd(e); |
944 | if (r < 0) { | |
945 | source_free(s); | |
946 | return r; | |
947 | } | |
948 | } | |
949 | ||
950 | *ret = s; | |
951 | return 0; | |
952 | } | |
953 | ||
f7262a9f | 954 | _public_ int sd_event_add_child( |
305f78bf | 955 | sd_event *e, |
151b9b96 | 956 | sd_event_source **ret, |
305f78bf LP |
957 | pid_t pid, |
958 | int options, | |
718db961 | 959 | sd_event_child_handler_t callback, |
151b9b96 | 960 | void *userdata) { |
305f78bf | 961 | |
fd38203a LP |
962 | sd_event_source *s; |
963 | int r; | |
964 | ||
305f78bf LP |
965 | assert_return(e, -EINVAL); |
966 | assert_return(pid > 1, -EINVAL); | |
967 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
968 | assert_return(options != 0, -EINVAL); | |
969 | assert_return(callback, -EINVAL); | |
970 | assert_return(ret, -EINVAL); | |
da7e457c | 971 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 972 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
973 | |
974 | r = hashmap_ensure_allocated(&e->child_sources, trivial_hash_func, trivial_compare_func); | |
975 | if (r < 0) | |
976 | return r; | |
977 | ||
978 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
979 | return -EBUSY; | |
980 | ||
981 | s = source_new(e, SOURCE_CHILD); | |
982 | if (!s) | |
983 | return -ENOMEM; | |
984 | ||
985 | s->child.pid = pid; | |
986 | s->child.options = options; | |
987 | s->child.callback = callback; | |
988 | s->userdata = userdata; | |
baf76283 | 989 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
990 | |
991 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
992 | if (r < 0) { | |
993 | source_free(s); | |
994 | return r; | |
995 | } | |
996 | ||
baf76283 | 997 | e->n_enabled_child_sources ++; |
fd38203a LP |
998 | |
999 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
1000 | ||
1001 | if (!e->signal_sources || !e->signal_sources[SIGCHLD]) { | |
1002 | r = event_update_signal_fd(e); | |
1003 | if (r < 0) { | |
1004 | source_free(s); | |
1005 | return -errno; | |
1006 | } | |
1007 | } | |
1008 | ||
c2ba3ad6 LP |
1009 | e->need_process_child = true; |
1010 | ||
fd38203a LP |
1011 | *ret = s; |
1012 | return 0; | |
1013 | } | |
1014 | ||
f7262a9f | 1015 | _public_ int sd_event_add_defer( |
305f78bf | 1016 | sd_event *e, |
151b9b96 | 1017 | sd_event_source **ret, |
718db961 | 1018 | sd_event_handler_t callback, |
151b9b96 | 1019 | void *userdata) { |
305f78bf | 1020 | |
fd38203a LP |
1021 | sd_event_source *s; |
1022 | int r; | |
1023 | ||
305f78bf LP |
1024 | assert_return(e, -EINVAL); |
1025 | assert_return(callback, -EINVAL); | |
1026 | assert_return(ret, -EINVAL); | |
da7e457c | 1027 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1028 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
1029 | |
1030 | s = source_new(e, SOURCE_DEFER); | |
1031 | if (!s) | |
1032 | return -ENOMEM; | |
1033 | ||
1034 | s->defer.callback = callback; | |
1035 | s->userdata = userdata; | |
baf76283 | 1036 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1037 | |
1038 | r = source_set_pending(s, true); | |
1039 | if (r < 0) { | |
1040 | source_free(s); | |
1041 | return r; | |
1042 | } | |
1043 | ||
1044 | *ret = s; | |
1045 | return 0; | |
1046 | } | |
1047 | ||
6e9feda3 LP |
1048 | _public_ int sd_event_add_post( |
1049 | sd_event *e, | |
1050 | sd_event_source **ret, | |
1051 | sd_event_handler_t callback, | |
1052 | void *userdata) { | |
1053 | ||
1054 | sd_event_source *s; | |
1055 | int r; | |
1056 | ||
1057 | assert_return(e, -EINVAL); | |
1058 | assert_return(callback, -EINVAL); | |
1059 | assert_return(ret, -EINVAL); | |
1060 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1061 | assert_return(!event_pid_changed(e), -ECHILD); | |
1062 | ||
1063 | r = set_ensure_allocated(&e->post_sources, trivial_hash_func, trivial_compare_func); | |
1064 | if (r < 0) | |
1065 | return r; | |
1066 | ||
1067 | s = source_new(e, SOURCE_POST); | |
1068 | if (!s) | |
1069 | return -ENOMEM; | |
1070 | ||
1071 | s->post.callback = callback; | |
1072 | s->userdata = userdata; | |
1073 | s->enabled = SD_EVENT_ON; | |
1074 | ||
1075 | r = set_put(e->post_sources, s); | |
1076 | if (r < 0) { | |
1077 | source_free(s); | |
1078 | return r; | |
1079 | } | |
1080 | ||
1081 | *ret = s; | |
1082 | return 0; | |
1083 | } | |
1084 | ||
6203e07a | 1085 | _public_ int sd_event_add_exit( |
305f78bf | 1086 | sd_event *e, |
151b9b96 | 1087 | sd_event_source **ret, |
718db961 | 1088 | sd_event_handler_t callback, |
151b9b96 | 1089 | void *userdata) { |
305f78bf | 1090 | |
da7e457c LP |
1091 | sd_event_source *s; |
1092 | int r; | |
1093 | ||
1094 | assert_return(e, -EINVAL); | |
1095 | assert_return(callback, -EINVAL); | |
305f78bf | 1096 | assert_return(ret, -EINVAL); |
da7e457c LP |
1097 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1098 | assert_return(!event_pid_changed(e), -ECHILD); | |
1099 | ||
6203e07a LP |
1100 | if (!e->exit) { |
1101 | e->exit = prioq_new(exit_prioq_compare); | |
1102 | if (!e->exit) | |
da7e457c LP |
1103 | return -ENOMEM; |
1104 | } | |
1105 | ||
6203e07a | 1106 | s = source_new(e, SOURCE_EXIT); |
fd38203a | 1107 | if (!s) |
da7e457c | 1108 | return -ENOMEM; |
fd38203a | 1109 | |
6203e07a | 1110 | s->exit.callback = callback; |
da7e457c | 1111 | s->userdata = userdata; |
6203e07a | 1112 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1113 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1114 | |
6203e07a | 1115 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1116 | if (r < 0) { |
1117 | source_free(s); | |
1118 | return r; | |
1119 | } | |
1120 | ||
1121 | *ret = s; | |
1122 | return 0; | |
1123 | } | |
1124 | ||
f7262a9f | 1125 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
da7e457c LP |
1126 | assert_return(s, NULL); |
1127 | ||
1128 | assert(s->n_ref >= 1); | |
1129 | s->n_ref++; | |
fd38203a LP |
1130 | |
1131 | return s; | |
1132 | } | |
1133 | ||
f7262a9f | 1134 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1135 | |
1136 | if (!s) | |
1137 | return NULL; | |
fd38203a | 1138 | |
da7e457c LP |
1139 | assert(s->n_ref >= 1); |
1140 | s->n_ref--; | |
1141 | ||
12179984 LP |
1142 | if (s->n_ref <= 0) { |
1143 | /* Here's a special hack: when we are called from a | |
1144 | * dispatch handler we won't free the event source | |
1145 | * immediately, but we will detach the fd from the | |
1146 | * epoll. This way it is safe for the caller to unref | |
1147 | * the event source and immediately close the fd, but | |
1148 | * we still retain a valid event source object after | |
1149 | * the callback. */ | |
1150 | ||
1151 | if (s->dispatching) { | |
1152 | if (s->type == SOURCE_IO) | |
1153 | source_io_unregister(s); | |
1154 | } else | |
1155 | source_free(s); | |
1156 | } | |
fd38203a LP |
1157 | |
1158 | return NULL; | |
1159 | } | |
1160 | ||
adcc4ca3 | 1161 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1162 | assert_return(s, NULL); |
eaa3cbef LP |
1163 | |
1164 | return s->event; | |
1165 | } | |
1166 | ||
f7262a9f | 1167 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1168 | assert_return(s, -EINVAL); |
6203e07a | 1169 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1170 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1171 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1172 | |
1173 | return s->pending; | |
1174 | } | |
1175 | ||
f7262a9f | 1176 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1177 | assert_return(s, -EINVAL); |
1178 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1179 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1180 | |
1181 | return s->io.fd; | |
1182 | } | |
1183 | ||
30caf8f3 LP |
1184 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1185 | int r; | |
1186 | ||
1187 | assert_return(s, -EINVAL); | |
1188 | assert_return(fd >= 0, -EINVAL); | |
1189 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1190 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1191 | ||
1192 | if (s->io.fd == fd) | |
1193 | return 0; | |
1194 | ||
1195 | if (s->enabled == SD_EVENT_OFF) { | |
1196 | s->io.fd = fd; | |
1197 | s->io.registered = false; | |
1198 | } else { | |
1199 | int saved_fd; | |
1200 | ||
1201 | saved_fd = s->io.fd; | |
1202 | assert(s->io.registered); | |
1203 | ||
1204 | s->io.fd = fd; | |
1205 | s->io.registered = false; | |
1206 | ||
1207 | r = source_io_register(s, s->enabled, s->io.events); | |
1208 | if (r < 0) { | |
1209 | s->io.fd = saved_fd; | |
1210 | s->io.registered = true; | |
1211 | return r; | |
1212 | } | |
1213 | ||
1214 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1215 | } | |
1216 | ||
1217 | return 0; | |
1218 | } | |
1219 | ||
f7262a9f | 1220 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1221 | assert_return(s, -EINVAL); |
1222 | assert_return(events, -EINVAL); | |
1223 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1224 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1225 | |
1226 | *events = s->io.events; | |
1227 | return 0; | |
1228 | } | |
1229 | ||
f7262a9f | 1230 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1231 | int r; |
1232 | ||
305f78bf LP |
1233 | assert_return(s, -EINVAL); |
1234 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1235 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1236 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1237 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1238 | |
1239 | if (s->io.events == events) | |
1240 | return 0; | |
1241 | ||
baf76283 | 1242 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1243 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1244 | if (r < 0) |
1245 | return r; | |
1246 | } | |
1247 | ||
1248 | s->io.events = events; | |
503f39c3 | 1249 | source_set_pending(s, false); |
fd38203a LP |
1250 | |
1251 | return 0; | |
1252 | } | |
1253 | ||
f7262a9f | 1254 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1255 | assert_return(s, -EINVAL); |
1256 | assert_return(revents, -EINVAL); | |
1257 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1258 | assert_return(s->pending, -ENODATA); | |
1259 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1260 | |
1261 | *revents = s->io.revents; | |
1262 | return 0; | |
1263 | } | |
1264 | ||
f7262a9f | 1265 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1266 | assert_return(s, -EINVAL); |
1267 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1268 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1269 | |
1270 | return s->signal.sig; | |
1271 | } | |
1272 | ||
31927c16 | 1273 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1274 | assert_return(s, -EINVAL); |
1275 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1276 | |
1277 | return s->priority; | |
1278 | } | |
1279 | ||
31927c16 | 1280 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
305f78bf | 1281 | assert_return(s, -EINVAL); |
da7e457c | 1282 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1283 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1284 | |
1285 | if (s->priority == priority) | |
1286 | return 0; | |
1287 | ||
1288 | s->priority = priority; | |
1289 | ||
1290 | if (s->pending) | |
c2ba3ad6 | 1291 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1292 | |
1293 | if (s->prepare) | |
c2ba3ad6 | 1294 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1295 | |
6203e07a LP |
1296 | if (s->type == SOURCE_EXIT) |
1297 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1298 | |
fd38203a LP |
1299 | return 0; |
1300 | } | |
1301 | ||
f7262a9f | 1302 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1303 | assert_return(s, -EINVAL); |
1304 | assert_return(m, -EINVAL); | |
1305 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1306 | |
baf76283 | 1307 | *m = s->enabled; |
fd38203a LP |
1308 | return 0; |
1309 | } | |
1310 | ||
f7262a9f | 1311 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1312 | int r; |
1313 | ||
305f78bf LP |
1314 | assert_return(s, -EINVAL); |
1315 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
305f78bf | 1316 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1317 | |
cc567911 LP |
1318 | /* If we are dead anyway, we are fine with turning off |
1319 | * sources, but everything else needs to fail. */ | |
1320 | if (s->event->state == SD_EVENT_FINISHED) | |
1321 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1322 | ||
baf76283 | 1323 | if (s->enabled == m) |
fd38203a LP |
1324 | return 0; |
1325 | ||
baf76283 | 1326 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1327 | |
1328 | switch (s->type) { | |
1329 | ||
1330 | case SOURCE_IO: | |
1331 | r = source_io_unregister(s); | |
1332 | if (r < 0) | |
1333 | return r; | |
1334 | ||
baf76283 | 1335 | s->enabled = m; |
fd38203a LP |
1336 | break; |
1337 | ||
6a0f1f6d LP |
1338 | case SOURCE_TIME_REALTIME: |
1339 | case SOURCE_TIME_MONOTONIC: | |
1340 | case SOURCE_TIME_REALTIME_ALARM: | |
1341 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1342 | struct clock_data *d; | |
fd38203a | 1343 | |
baf76283 | 1344 | s->enabled = m; |
6a0f1f6d LP |
1345 | d = event_get_clock_data(s->event, s->type); |
1346 | assert(d); | |
1347 | ||
1348 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1349 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a | 1350 | break; |
6a0f1f6d | 1351 | } |
fd38203a LP |
1352 | |
1353 | case SOURCE_SIGNAL: | |
baf76283 LP |
1354 | s->enabled = m; |
1355 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { | |
fd38203a LP |
1356 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
1357 | event_update_signal_fd(s->event); | |
1358 | } | |
1359 | ||
1360 | break; | |
1361 | ||
1362 | case SOURCE_CHILD: | |
baf76283 | 1363 | s->enabled = m; |
fd38203a | 1364 | |
baf76283 LP |
1365 | assert(s->event->n_enabled_child_sources > 0); |
1366 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
1367 | |
1368 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1369 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
1370 | event_update_signal_fd(s->event); | |
1371 | } | |
1372 | ||
1373 | break; | |
1374 | ||
6203e07a | 1375 | case SOURCE_EXIT: |
305f78bf | 1376 | s->enabled = m; |
6203e07a | 1377 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1378 | break; |
1379 | ||
1380 | case SOURCE_DEFER: | |
6e9feda3 | 1381 | case SOURCE_POST: |
baf76283 | 1382 | s->enabled = m; |
fd38203a | 1383 | break; |
9d3e3aa5 | 1384 | |
6a0f1f6d | 1385 | default: |
9d3e3aa5 | 1386 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1387 | } |
1388 | ||
1389 | } else { | |
1390 | switch (s->type) { | |
1391 | ||
1392 | case SOURCE_IO: | |
1393 | r = source_io_register(s, m, s->io.events); | |
1394 | if (r < 0) | |
1395 | return r; | |
1396 | ||
baf76283 | 1397 | s->enabled = m; |
fd38203a LP |
1398 | break; |
1399 | ||
6a0f1f6d LP |
1400 | case SOURCE_TIME_REALTIME: |
1401 | case SOURCE_TIME_MONOTONIC: | |
1402 | case SOURCE_TIME_REALTIME_ALARM: | |
1403 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1404 | struct clock_data *d; | |
fd38203a | 1405 | |
baf76283 | 1406 | s->enabled = m; |
6a0f1f6d LP |
1407 | d = event_get_clock_data(s->event, s->type); |
1408 | assert(d); | |
1409 | ||
1410 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1411 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a | 1412 | break; |
6a0f1f6d | 1413 | } |
fd38203a LP |
1414 | |
1415 | case SOURCE_SIGNAL: | |
baf76283 | 1416 | s->enabled = m; |
fd38203a | 1417 | |
baf76283 | 1418 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { |
fd38203a LP |
1419 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
1420 | event_update_signal_fd(s->event); | |
1421 | } | |
1422 | break; | |
1423 | ||
1424 | case SOURCE_CHILD: | |
baf76283 LP |
1425 | if (s->enabled == SD_EVENT_OFF) { |
1426 | s->event->n_enabled_child_sources++; | |
fd38203a LP |
1427 | |
1428 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1429 | assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0); | |
1430 | event_update_signal_fd(s->event); | |
1431 | } | |
1432 | } | |
7a0d4a3d DH |
1433 | |
1434 | s->enabled = m; | |
fd38203a LP |
1435 | break; |
1436 | ||
6203e07a | 1437 | case SOURCE_EXIT: |
305f78bf | 1438 | s->enabled = m; |
6203e07a | 1439 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1440 | break; |
1441 | ||
1442 | case SOURCE_DEFER: | |
6e9feda3 | 1443 | case SOURCE_POST: |
baf76283 | 1444 | s->enabled = m; |
fd38203a | 1445 | break; |
9d3e3aa5 | 1446 | |
6a0f1f6d | 1447 | default: |
9d3e3aa5 | 1448 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1449 | } |
1450 | } | |
1451 | ||
1452 | if (s->pending) | |
1453 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1454 | ||
1455 | if (s->prepare) | |
1456 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1457 | ||
1458 | return 0; | |
1459 | } | |
1460 | ||
f7262a9f | 1461 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1462 | assert_return(s, -EINVAL); |
1463 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1464 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1465 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1466 | |
1467 | *usec = s->time.next; | |
1468 | return 0; | |
1469 | } | |
1470 | ||
f7262a9f | 1471 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1472 | struct clock_data *d; |
1473 | ||
305f78bf LP |
1474 | assert_return(s, -EINVAL); |
1475 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1476 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1477 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1478 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1479 | |
fd38203a | 1480 | s->time.next = usec; |
2576a19e | 1481 | |
0cc1125a | 1482 | source_set_pending(s, false); |
fd38203a | 1483 | |
6a0f1f6d LP |
1484 | d = event_get_clock_data(s->event, s->type); |
1485 | assert(d); | |
1486 | ||
1487 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1488 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a LP |
1489 | |
1490 | return 0; | |
1491 | } | |
1492 | ||
f7262a9f | 1493 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1494 | assert_return(s, -EINVAL); |
1495 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1496 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1497 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1498 | ||
1499 | *usec = s->time.accuracy; | |
1500 | return 0; | |
1501 | } | |
1502 | ||
f7262a9f | 1503 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1504 | struct clock_data *d; |
1505 | ||
305f78bf LP |
1506 | assert_return(s, -EINVAL); |
1507 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1508 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1509 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1510 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1511 | |
1512 | if (usec == 0) | |
1513 | usec = DEFAULT_ACCURACY_USEC; | |
1514 | ||
eaa3cbef LP |
1515 | s->time.accuracy = usec; |
1516 | ||
2576a19e LP |
1517 | source_set_pending(s, false); |
1518 | ||
6a0f1f6d LP |
1519 | d = event_get_clock_data(s->event, s->type); |
1520 | assert(d); | |
1521 | ||
1522 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
1523 | ||
1524 | return 0; | |
1525 | } | |
1526 | ||
1527 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1528 | assert_return(s, -EINVAL); | |
1529 | assert_return(clock, -EINVAL); | |
1530 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1531 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1532 | |
6a0f1f6d | 1533 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1534 | return 0; |
1535 | } | |
1536 | ||
f7262a9f | 1537 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1538 | assert_return(s, -EINVAL); |
1539 | assert_return(pid, -EINVAL); | |
1540 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1541 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1542 | ||
1543 | *pid = s->child.pid; | |
1544 | return 0; | |
1545 | } | |
1546 | ||
718db961 | 1547 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1548 | int r; |
1549 | ||
da7e457c | 1550 | assert_return(s, -EINVAL); |
6203e07a | 1551 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1552 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1553 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1554 | |
1555 | if (s->prepare == callback) | |
1556 | return 0; | |
1557 | ||
1558 | if (callback && s->prepare) { | |
1559 | s->prepare = callback; | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1564 | if (r < 0) | |
1565 | return r; | |
1566 | ||
1567 | s->prepare = callback; | |
1568 | ||
1569 | if (callback) { | |
1570 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1571 | if (r < 0) | |
1572 | return r; | |
1573 | } else | |
1574 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1575 | ||
1576 | return 0; | |
1577 | } | |
1578 | ||
f7262a9f | 1579 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1580 | assert_return(s, NULL); |
fd38203a LP |
1581 | |
1582 | return s->userdata; | |
1583 | } | |
1584 | ||
8f726607 LP |
1585 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1586 | void *ret; | |
1587 | ||
1588 | assert_return(s, NULL); | |
1589 | ||
1590 | ret = s->userdata; | |
1591 | s->userdata = userdata; | |
1592 | ||
1593 | return ret; | |
1594 | } | |
1595 | ||
c2ba3ad6 LP |
1596 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1597 | usec_t c; | |
1598 | assert(e); | |
1599 | assert(a <= b); | |
1600 | ||
1601 | if (a <= 0) | |
1602 | return 0; | |
1603 | ||
1604 | if (b <= a + 1) | |
1605 | return a; | |
1606 | ||
52444dc4 LP |
1607 | initialize_perturb(e); |
1608 | ||
c2ba3ad6 LP |
1609 | /* |
1610 | Find a good time to wake up again between times a and b. We | |
1611 | have two goals here: | |
1612 | ||
1613 | a) We want to wake up as seldom as possible, hence prefer | |
1614 | later times over earlier times. | |
1615 | ||
1616 | b) But if we have to wake up, then let's make sure to | |
1617 | dispatch as much as possible on the entire system. | |
1618 | ||
1619 | We implement this by waking up everywhere at the same time | |
850516e0 | 1620 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1621 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1622 | then we try to find the same spot in every 10s, then 1s and |
1623 | then 250ms step. Otherwise, we pick the last possible time | |
1624 | to wake up. | |
c2ba3ad6 LP |
1625 | */ |
1626 | ||
850516e0 LP |
1627 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1628 | if (c >= b) { | |
1629 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1630 | return b; | |
1631 | ||
1632 | c -= USEC_PER_MINUTE; | |
1633 | } | |
1634 | ||
ba276c81 LP |
1635 | if (c >= a) |
1636 | return c; | |
1637 | ||
1638 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1639 | if (c >= b) { | |
1640 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1641 | return b; | |
1642 | ||
1643 | c -= USEC_PER_SEC*10; | |
1644 | } | |
1645 | ||
850516e0 LP |
1646 | if (c >= a) |
1647 | return c; | |
1648 | ||
1649 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1650 | if (c >= b) { |
1651 | if (_unlikely_(c < USEC_PER_SEC)) | |
1652 | return b; | |
1653 | ||
1654 | c -= USEC_PER_SEC; | |
1655 | } | |
1656 | ||
1657 | if (c >= a) | |
1658 | return c; | |
1659 | ||
1660 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1661 | if (c >= b) { | |
1662 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1663 | return b; | |
1664 | ||
1665 | c -= USEC_PER_MSEC*250; | |
1666 | } | |
1667 | ||
1668 | if (c >= a) | |
1669 | return c; | |
1670 | ||
1671 | return b; | |
1672 | } | |
1673 | ||
fd38203a LP |
1674 | static int event_arm_timer( |
1675 | sd_event *e, | |
6a0f1f6d | 1676 | struct clock_data *d) { |
fd38203a LP |
1677 | |
1678 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1679 | sd_event_source *a, *b; |
1680 | usec_t t; | |
fd38203a LP |
1681 | int r; |
1682 | ||
cde93897 | 1683 | assert(e); |
6a0f1f6d | 1684 | assert(d); |
fd38203a | 1685 | |
6a0f1f6d | 1686 | a = prioq_peek(d->earliest); |
72aedc1e LP |
1687 | if (!a || a->enabled == SD_EVENT_OFF) { |
1688 | ||
6a0f1f6d | 1689 | if (d->fd < 0) |
c57b5ca3 LP |
1690 | return 0; |
1691 | ||
6a0f1f6d | 1692 | if (d->next == (usec_t) -1) |
72aedc1e LP |
1693 | return 0; |
1694 | ||
1695 | /* disarm */ | |
6a0f1f6d | 1696 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1697 | if (r < 0) |
1698 | return r; | |
1699 | ||
6a0f1f6d | 1700 | d->next = (usec_t) -1; |
fd38203a | 1701 | return 0; |
72aedc1e | 1702 | } |
fd38203a | 1703 | |
6a0f1f6d | 1704 | b = prioq_peek(d->latest); |
baf76283 | 1705 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1706 | |
1707 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
6a0f1f6d | 1708 | if (d->next == t) |
fd38203a LP |
1709 | return 0; |
1710 | ||
6a0f1f6d | 1711 | assert_se(d->fd >= 0); |
fd38203a | 1712 | |
c2ba3ad6 | 1713 | if (t == 0) { |
fd38203a LP |
1714 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1715 | its.it_value.tv_sec = 0; | |
1716 | its.it_value.tv_nsec = 1; | |
1717 | } else | |
c2ba3ad6 | 1718 | timespec_store(&its.it_value, t); |
fd38203a | 1719 | |
6a0f1f6d | 1720 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 1721 | if (r < 0) |
cde93897 | 1722 | return -errno; |
fd38203a | 1723 | |
6a0f1f6d | 1724 | d->next = t; |
fd38203a LP |
1725 | return 0; |
1726 | } | |
1727 | ||
9a800b56 | 1728 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
1729 | assert(e); |
1730 | assert(s); | |
1731 | assert(s->type == SOURCE_IO); | |
1732 | ||
9a800b56 LP |
1733 | /* If the event source was already pending, we just OR in the |
1734 | * new revents, otherwise we reset the value. The ORing is | |
1735 | * necessary to handle EPOLLONESHOT events properly where | |
1736 | * readability might happen independently of writability, and | |
1737 | * we need to keep track of both */ | |
1738 | ||
1739 | if (s->pending) | |
1740 | s->io.revents |= revents; | |
1741 | else | |
1742 | s->io.revents = revents; | |
fd38203a | 1743 | |
fd38203a LP |
1744 | return source_set_pending(s, true); |
1745 | } | |
1746 | ||
72aedc1e | 1747 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
1748 | uint64_t x; |
1749 | ssize_t ss; | |
1750 | ||
1751 | assert(e); | |
da7e457c | 1752 | assert(fd >= 0); |
72aedc1e | 1753 | |
305f78bf | 1754 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1755 | |
1756 | ss = read(fd, &x, sizeof(x)); | |
1757 | if (ss < 0) { | |
1758 | if (errno == EAGAIN || errno == EINTR) | |
1759 | return 0; | |
1760 | ||
1761 | return -errno; | |
1762 | } | |
1763 | ||
8d35dae7 | 1764 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
1765 | return -EIO; |
1766 | ||
cde93897 LP |
1767 | if (next) |
1768 | *next = (usec_t) -1; | |
72aedc1e | 1769 | |
fd38203a LP |
1770 | return 0; |
1771 | } | |
1772 | ||
305f78bf LP |
1773 | static int process_timer( |
1774 | sd_event *e, | |
1775 | usec_t n, | |
6a0f1f6d | 1776 | struct clock_data *d) { |
305f78bf | 1777 | |
fd38203a LP |
1778 | sd_event_source *s; |
1779 | int r; | |
1780 | ||
1781 | assert(e); | |
6a0f1f6d | 1782 | assert(d); |
fd38203a LP |
1783 | |
1784 | for (;;) { | |
6a0f1f6d | 1785 | s = prioq_peek(d->earliest); |
fd38203a LP |
1786 | if (!s || |
1787 | s->time.next > n || | |
baf76283 | 1788 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1789 | s->pending) |
1790 | break; | |
1791 | ||
1792 | r = source_set_pending(s, true); | |
1793 | if (r < 0) | |
1794 | return r; | |
1795 | ||
6a0f1f6d LP |
1796 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
1797 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
fd38203a LP |
1798 | } |
1799 | ||
1800 | return 0; | |
1801 | } | |
1802 | ||
1803 | static int process_child(sd_event *e) { | |
1804 | sd_event_source *s; | |
1805 | Iterator i; | |
1806 | int r; | |
1807 | ||
1808 | assert(e); | |
1809 | ||
c2ba3ad6 LP |
1810 | e->need_process_child = false; |
1811 | ||
fd38203a LP |
1812 | /* |
1813 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1814 | + WNOHANG for each PID we wait for, instead of using | |
1815 | P_ALL. This is because we only want to get child | |
1816 | information of very specific child processes, and not all | |
1817 | of them. We might not have processed the SIGCHLD even of a | |
1818 | previous invocation and we don't want to maintain a | |
1819 | unbounded *per-child* event queue, hence we really don't | |
1820 | want anything flushed out of the kernel's queue that we | |
1821 | don't care about. Since this is O(n) this means that if you | |
1822 | have a lot of processes you probably want to handle SIGCHLD | |
1823 | yourself. | |
08cd1552 LP |
1824 | |
1825 | We do not reap the children here (by using WNOWAIT), this | |
1826 | is only done after the event source is dispatched so that | |
1827 | the callback still sees the process as a zombie. | |
fd38203a LP |
1828 | */ |
1829 | ||
1830 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1831 | assert(s->type == SOURCE_CHILD); | |
1832 | ||
1833 | if (s->pending) | |
1834 | continue; | |
1835 | ||
baf76283 | 1836 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1837 | continue; |
1838 | ||
1839 | zero(s->child.siginfo); | |
08cd1552 LP |
1840 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
1841 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
1842 | if (r < 0) |
1843 | return -errno; | |
1844 | ||
1845 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
1846 | bool zombie = |
1847 | s->child.siginfo.si_code == CLD_EXITED || | |
1848 | s->child.siginfo.si_code == CLD_KILLED || | |
1849 | s->child.siginfo.si_code == CLD_DUMPED; | |
1850 | ||
1851 | if (!zombie && (s->child.options & WEXITED)) { | |
1852 | /* If the child isn't dead then let's | |
1853 | * immediately remove the state change | |
1854 | * from the queue, since there's no | |
1855 | * benefit in leaving it queued */ | |
1856 | ||
1857 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
1858 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
1859 | } | |
1860 | ||
fd38203a LP |
1861 | r = source_set_pending(s, true); |
1862 | if (r < 0) | |
1863 | return r; | |
1864 | } | |
1865 | } | |
1866 | ||
fd38203a LP |
1867 | return 0; |
1868 | } | |
1869 | ||
1870 | static int process_signal(sd_event *e, uint32_t events) { | |
fd38203a | 1871 | bool read_one = false; |
fd38203a LP |
1872 | int r; |
1873 | ||
da7e457c | 1874 | assert(e); |
0eb2e0e3 ZJS |
1875 | assert(e->signal_sources); |
1876 | ||
305f78bf | 1877 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1878 | |
1879 | for (;;) { | |
0eb2e0e3 ZJS |
1880 | struct signalfd_siginfo si; |
1881 | ssize_t ss; | |
fd38203a LP |
1882 | sd_event_source *s; |
1883 | ||
1884 | ss = read(e->signal_fd, &si, sizeof(si)); | |
1885 | if (ss < 0) { | |
1886 | if (errno == EAGAIN || errno == EINTR) | |
1887 | return read_one; | |
1888 | ||
1889 | return -errno; | |
1890 | } | |
1891 | ||
8d35dae7 | 1892 | if (_unlikely_(ss != sizeof(si))) |
fd38203a LP |
1893 | return -EIO; |
1894 | ||
1895 | read_one = true; | |
1896 | ||
0eb2e0e3 | 1897 | s = e->signal_sources[si.ssi_signo]; |
fd38203a LP |
1898 | if (si.ssi_signo == SIGCHLD) { |
1899 | r = process_child(e); | |
1900 | if (r < 0) | |
1901 | return r; | |
0eb2e0e3 | 1902 | if (r > 0 || !s) |
fd38203a | 1903 | continue; |
0eb2e0e3 | 1904 | } else |
fd38203a LP |
1905 | if (!s) |
1906 | return -EIO; | |
fd38203a LP |
1907 | |
1908 | s->signal.siginfo = si; | |
1909 | r = source_set_pending(s, true); | |
1910 | if (r < 0) | |
1911 | return r; | |
1912 | } | |
fd38203a LP |
1913 | } |
1914 | ||
1915 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 1916 | int r = 0; |
fd38203a LP |
1917 | |
1918 | assert(s); | |
6203e07a | 1919 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 1920 | |
6203e07a | 1921 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
1922 | r = source_set_pending(s, false); |
1923 | if (r < 0) | |
1924 | return r; | |
1925 | } | |
fd38203a | 1926 | |
6e9feda3 LP |
1927 | if (s->type != SOURCE_POST) { |
1928 | sd_event_source *z; | |
1929 | Iterator i; | |
1930 | ||
1931 | /* If we execute a non-post source, let's mark all | |
1932 | * post sources as pending */ | |
1933 | ||
1934 | SET_FOREACH(z, s->event->post_sources, i) { | |
1935 | if (z->enabled == SD_EVENT_OFF) | |
1936 | continue; | |
1937 | ||
1938 | r = source_set_pending(z, true); | |
1939 | if (r < 0) | |
1940 | return r; | |
1941 | } | |
1942 | } | |
1943 | ||
baf76283 LP |
1944 | if (s->enabled == SD_EVENT_ONESHOT) { |
1945 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
1946 | if (r < 0) |
1947 | return r; | |
1948 | } | |
1949 | ||
12179984 | 1950 | s->dispatching = true; |
b7484e2a | 1951 | |
fd38203a LP |
1952 | switch (s->type) { |
1953 | ||
1954 | case SOURCE_IO: | |
1955 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
1956 | break; | |
1957 | ||
6a0f1f6d LP |
1958 | case SOURCE_TIME_REALTIME: |
1959 | case SOURCE_TIME_MONOTONIC: | |
1960 | case SOURCE_TIME_REALTIME_ALARM: | |
1961 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
1962 | r = s->time.callback(s, s->time.next, s->userdata); |
1963 | break; | |
1964 | ||
1965 | case SOURCE_SIGNAL: | |
1966 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
1967 | break; | |
1968 | ||
08cd1552 LP |
1969 | case SOURCE_CHILD: { |
1970 | bool zombie; | |
1971 | ||
1972 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
1973 | s->child.siginfo.si_code == CLD_KILLED || | |
1974 | s->child.siginfo.si_code == CLD_DUMPED; | |
1975 | ||
fd38203a | 1976 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
1977 | |
1978 | /* Now, reap the PID for good. */ | |
1979 | if (zombie) | |
1980 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
1981 | ||
fd38203a | 1982 | break; |
08cd1552 | 1983 | } |
fd38203a LP |
1984 | |
1985 | case SOURCE_DEFER: | |
1986 | r = s->defer.callback(s, s->userdata); | |
1987 | break; | |
da7e457c | 1988 | |
6e9feda3 LP |
1989 | case SOURCE_POST: |
1990 | r = s->post.callback(s, s->userdata); | |
1991 | break; | |
1992 | ||
6203e07a LP |
1993 | case SOURCE_EXIT: |
1994 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 1995 | break; |
9d3e3aa5 LP |
1996 | |
1997 | case SOURCE_WATCHDOG: | |
9f2a50a3 TA |
1998 | case _SOUFCE_EVENT_SOURCE_TYPE_MAX: |
1999 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: | |
9d3e3aa5 | 2000 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2001 | } |
2002 | ||
12179984 LP |
2003 | s->dispatching = false; |
2004 | ||
2005 | if (r < 0) | |
6203e07a | 2006 | log_debug("Event source %p returned error, disabling: %s", s, strerror(-r)); |
12179984 LP |
2007 | |
2008 | if (s->n_ref == 0) | |
2009 | source_free(s); | |
2010 | else if (r < 0) | |
6203e07a | 2011 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2012 | |
6203e07a | 2013 | return 1; |
fd38203a LP |
2014 | } |
2015 | ||
2016 | static int event_prepare(sd_event *e) { | |
2017 | int r; | |
2018 | ||
2019 | assert(e); | |
2020 | ||
2021 | for (;;) { | |
2022 | sd_event_source *s; | |
2023 | ||
2024 | s = prioq_peek(e->prepare); | |
baf76283 | 2025 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2026 | break; |
2027 | ||
2028 | s->prepare_iteration = e->iteration; | |
2029 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2030 | if (r < 0) | |
2031 | return r; | |
2032 | ||
2033 | assert(s->prepare); | |
12179984 LP |
2034 | |
2035 | s->dispatching = true; | |
fd38203a | 2036 | r = s->prepare(s, s->userdata); |
12179984 LP |
2037 | s->dispatching = false; |
2038 | ||
fd38203a | 2039 | if (r < 0) |
12179984 | 2040 | log_debug("Prepare callback of event source %p returned error, disabling: %s", s, strerror(-r)); |
fd38203a | 2041 | |
12179984 LP |
2042 | if (s->n_ref == 0) |
2043 | source_free(s); | |
2044 | else if (r < 0) | |
2045 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2046 | } |
2047 | ||
2048 | return 0; | |
2049 | } | |
2050 | ||
6203e07a | 2051 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2052 | sd_event_source *p; |
2053 | int r; | |
2054 | ||
2055 | assert(e); | |
2056 | ||
6203e07a | 2057 | p = prioq_peek(e->exit); |
baf76283 | 2058 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2059 | e->state = SD_EVENT_FINISHED; |
2060 | return 0; | |
2061 | } | |
2062 | ||
2063 | sd_event_ref(e); | |
2064 | e->iteration++; | |
6203e07a | 2065 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2066 | |
2067 | r = source_dispatch(p); | |
2068 | ||
2069 | e->state = SD_EVENT_PASSIVE; | |
2070 | sd_event_unref(e); | |
2071 | ||
2072 | return r; | |
2073 | } | |
2074 | ||
c2ba3ad6 LP |
2075 | static sd_event_source* event_next_pending(sd_event *e) { |
2076 | sd_event_source *p; | |
2077 | ||
da7e457c LP |
2078 | assert(e); |
2079 | ||
c2ba3ad6 LP |
2080 | p = prioq_peek(e->pending); |
2081 | if (!p) | |
2082 | return NULL; | |
2083 | ||
baf76283 | 2084 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2085 | return NULL; |
2086 | ||
2087 | return p; | |
2088 | } | |
2089 | ||
cde93897 LP |
2090 | static int arm_watchdog(sd_event *e) { |
2091 | struct itimerspec its = {}; | |
2092 | usec_t t; | |
2093 | int r; | |
2094 | ||
2095 | assert(e); | |
2096 | assert(e->watchdog_fd >= 0); | |
2097 | ||
2098 | t = sleep_between(e, | |
2099 | e->watchdog_last + (e->watchdog_period / 2), | |
2100 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2101 | ||
2102 | timespec_store(&its.it_value, t); | |
2103 | ||
75145780 LP |
2104 | /* Make sure we never set the watchdog to 0, which tells the |
2105 | * kernel to disable it. */ | |
2106 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2107 | its.it_value.tv_nsec = 1; | |
2108 | ||
cde93897 LP |
2109 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2110 | if (r < 0) | |
2111 | return -errno; | |
2112 | ||
2113 | return 0; | |
2114 | } | |
2115 | ||
2116 | static int process_watchdog(sd_event *e) { | |
2117 | assert(e); | |
2118 | ||
2119 | if (!e->watchdog) | |
2120 | return 0; | |
2121 | ||
2122 | /* Don't notify watchdog too often */ | |
2123 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2124 | return 0; | |
2125 | ||
2126 | sd_notify(false, "WATCHDOG=1"); | |
2127 | e->watchdog_last = e->timestamp.monotonic; | |
2128 | ||
2129 | return arm_watchdog(e); | |
2130 | } | |
2131 | ||
f7262a9f | 2132 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
15b38f93 LP |
2133 | struct epoll_event *ev_queue; |
2134 | unsigned ev_queue_max; | |
fd38203a | 2135 | sd_event_source *p; |
305f78bf | 2136 | int r, i, m; |
fd38203a | 2137 | |
da7e457c LP |
2138 | assert_return(e, -EINVAL); |
2139 | assert_return(!event_pid_changed(e), -ECHILD); | |
2140 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2141 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2142 | ||
6203e07a LP |
2143 | if (e->exit_requested) |
2144 | return dispatch_exit(e); | |
fd38203a | 2145 | |
da7e457c | 2146 | sd_event_ref(e); |
fd38203a | 2147 | e->iteration++; |
da7e457c | 2148 | e->state = SD_EVENT_RUNNING; |
fd38203a LP |
2149 | |
2150 | r = event_prepare(e); | |
2151 | if (r < 0) | |
da7e457c | 2152 | goto finish; |
fd38203a | 2153 | |
6a0f1f6d LP |
2154 | r = event_arm_timer(e, &e->realtime); |
2155 | if (r < 0) | |
2156 | goto finish; | |
2157 | ||
2158 | r = event_arm_timer(e, &e->monotonic); | |
2159 | if (r < 0) | |
2160 | goto finish; | |
2161 | ||
2162 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 LP |
2163 | if (r < 0) |
2164 | goto finish; | |
fd38203a | 2165 | |
6a0f1f6d | 2166 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 LP |
2167 | if (r < 0) |
2168 | goto finish; | |
fd38203a | 2169 | |
1b5995b0 LP |
2170 | if (event_next_pending(e) || e->need_process_child) |
2171 | timeout = 0; | |
6a0f1f6d | 2172 | |
15b38f93 LP |
2173 | ev_queue_max = CLAMP(e->n_sources, 1U, EPOLL_QUEUE_MAX); |
2174 | ev_queue = newa(struct epoll_event, ev_queue_max); | |
fd38203a | 2175 | |
15b38f93 | 2176 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2177 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2178 | if (m < 0) { |
ff003106 | 2179 | r = errno == EAGAIN || errno == EINTR ? 1 : -errno; |
da7e457c LP |
2180 | goto finish; |
2181 | } | |
fd38203a | 2182 | |
46e8c825 | 2183 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2184 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2185 | |
2186 | for (i = 0; i < m; i++) { | |
2187 | ||
6a0f1f6d LP |
2188 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME)) |
2189 | r = flush_timer(e, e->realtime.fd, ev_queue[i].events, &e->realtime.next); | |
2190 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_MONOTONIC)) | |
2191 | r = flush_timer(e, e->monotonic.fd, ev_queue[i].events, &e->monotonic.next); | |
2192 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME_ALARM)) | |
2193 | r = flush_timer(e, e->realtime_alarm.fd, ev_queue[i].events, &e->realtime_alarm.next); | |
2194 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_BOOTTIME_ALARM)) | |
2195 | r = flush_timer(e, e->boottime_alarm.fd, ev_queue[i].events, &e->boottime_alarm.next); | |
fd38203a LP |
2196 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) |
2197 | r = process_signal(e, ev_queue[i].events); | |
79e16ce3 | 2198 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2199 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
fd38203a LP |
2200 | else |
2201 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2202 | ||
2203 | if (r < 0) | |
da7e457c | 2204 | goto finish; |
fd38203a LP |
2205 | } |
2206 | ||
cde93897 LP |
2207 | r = process_watchdog(e); |
2208 | if (r < 0) | |
2209 | goto finish; | |
2210 | ||
6a0f1f6d LP |
2211 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2212 | if (r < 0) | |
2213 | goto finish; | |
2214 | ||
2215 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); | |
2216 | if (r < 0) | |
2217 | goto finish; | |
2218 | ||
2219 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2220 | if (r < 0) |
da7e457c | 2221 | goto finish; |
fd38203a | 2222 | |
6a0f1f6d | 2223 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2224 | if (r < 0) |
da7e457c | 2225 | goto finish; |
fd38203a | 2226 | |
c2ba3ad6 | 2227 | if (e->need_process_child) { |
fd38203a LP |
2228 | r = process_child(e); |
2229 | if (r < 0) | |
da7e457c | 2230 | goto finish; |
fd38203a LP |
2231 | } |
2232 | ||
c2ba3ad6 | 2233 | p = event_next_pending(e); |
da7e457c | 2234 | if (!p) { |
f98a58fe | 2235 | r = 1; |
da7e457c LP |
2236 | goto finish; |
2237 | } | |
2238 | ||
2239 | r = source_dispatch(p); | |
fd38203a | 2240 | |
da7e457c LP |
2241 | finish: |
2242 | e->state = SD_EVENT_PASSIVE; | |
2243 | sd_event_unref(e); | |
2244 | ||
2245 | return r; | |
fd38203a LP |
2246 | } |
2247 | ||
f7262a9f | 2248 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2249 | int r; |
2250 | ||
da7e457c LP |
2251 | assert_return(e, -EINVAL); |
2252 | assert_return(!event_pid_changed(e), -ECHILD); | |
2253 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2254 | ||
2255 | sd_event_ref(e); | |
fd38203a | 2256 | |
da7e457c | 2257 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2258 | r = sd_event_run(e, (uint64_t) -1); |
2259 | if (r < 0) | |
da7e457c | 2260 | goto finish; |
fd38203a LP |
2261 | } |
2262 | ||
6203e07a | 2263 | r = e->exit_code; |
da7e457c LP |
2264 | |
2265 | finish: | |
2266 | sd_event_unref(e); | |
2267 | return r; | |
fd38203a LP |
2268 | } |
2269 | ||
f7262a9f | 2270 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2271 | assert_return(e, -EINVAL); |
2272 | assert_return(!event_pid_changed(e), -ECHILD); | |
2273 | ||
2274 | return e->state; | |
2275 | } | |
2276 | ||
6203e07a | 2277 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2278 | assert_return(e, -EINVAL); |
6203e07a | 2279 | assert_return(code, -EINVAL); |
da7e457c | 2280 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2281 | |
6203e07a LP |
2282 | if (!e->exit_requested) |
2283 | return -ENODATA; | |
2284 | ||
2285 | *code = e->exit_code; | |
2286 | return 0; | |
fd38203a LP |
2287 | } |
2288 | ||
6203e07a | 2289 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2290 | assert_return(e, -EINVAL); |
2291 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2292 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2293 | |
6203e07a LP |
2294 | e->exit_requested = true; |
2295 | e->exit_code = code; | |
2296 | ||
fd38203a LP |
2297 | return 0; |
2298 | } | |
46e8c825 | 2299 | |
6a0f1f6d | 2300 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2301 | assert_return(e, -EINVAL); |
2302 | assert_return(usec, -EINVAL); | |
46e8c825 LP |
2303 | assert_return(!event_pid_changed(e), -ECHILD); |
2304 | ||
6a0f1f6d LP |
2305 | /* If we haven't run yet, just get the actual time */ |
2306 | if (!dual_timestamp_is_set(&e->timestamp)) | |
2307 | return -ENODATA; | |
46e8c825 | 2308 | |
6a0f1f6d LP |
2309 | switch (clock) { |
2310 | ||
2311 | case CLOCK_REALTIME: | |
2312 | case CLOCK_REALTIME_ALARM: | |
2313 | *usec = e->timestamp.realtime; | |
2314 | break; | |
2315 | ||
2316 | case CLOCK_MONOTONIC: | |
2317 | *usec = e->timestamp.monotonic; | |
2318 | break; | |
2319 | ||
2320 | case CLOCK_BOOTTIME_ALARM: | |
2321 | *usec = e->timestamp_boottime; | |
2322 | break; | |
2323 | } | |
46e8c825 | 2324 | |
46e8c825 LP |
2325 | return 0; |
2326 | } | |
afc6adb5 LP |
2327 | |
2328 | _public_ int sd_event_default(sd_event **ret) { | |
2329 | ||
ec202eae | 2330 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2331 | sd_event *e = NULL; |
afc6adb5 LP |
2332 | int r; |
2333 | ||
2334 | if (!ret) | |
2335 | return !!default_event; | |
2336 | ||
2337 | if (default_event) { | |
2338 | *ret = sd_event_ref(default_event); | |
2339 | return 0; | |
2340 | } | |
2341 | ||
2342 | r = sd_event_new(&e); | |
2343 | if (r < 0) | |
2344 | return r; | |
2345 | ||
2346 | e->default_event_ptr = &default_event; | |
2347 | e->tid = gettid(); | |
2348 | default_event = e; | |
2349 | ||
2350 | *ret = e; | |
2351 | return 1; | |
2352 | } | |
2353 | ||
2354 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2355 | assert_return(e, -EINVAL); | |
2356 | assert_return(tid, -EINVAL); | |
76b54375 | 2357 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2358 | |
76b54375 LP |
2359 | if (e->tid != 0) { |
2360 | *tid = e->tid; | |
2361 | return 0; | |
2362 | } | |
2363 | ||
2364 | return -ENXIO; | |
afc6adb5 | 2365 | } |
cde93897 LP |
2366 | |
2367 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2368 | int r; | |
2369 | ||
2370 | assert_return(e, -EINVAL); | |
8f726607 | 2371 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2372 | |
2373 | if (e->watchdog == !!b) | |
2374 | return e->watchdog; | |
2375 | ||
2376 | if (b) { | |
2377 | struct epoll_event ev = {}; | |
cde93897 | 2378 | |
09812eb7 LP |
2379 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2380 | if (r <= 0) | |
cde93897 | 2381 | return r; |
cde93897 LP |
2382 | |
2383 | /* Issue first ping immediately */ | |
2384 | sd_notify(false, "WATCHDOG=1"); | |
2385 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2386 | ||
2387 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2388 | if (e->watchdog_fd < 0) | |
2389 | return -errno; | |
2390 | ||
2391 | r = arm_watchdog(e); | |
2392 | if (r < 0) | |
2393 | goto fail; | |
2394 | ||
2395 | ev.events = EPOLLIN; | |
2396 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2397 | ||
2398 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2399 | if (r < 0) { | |
2400 | r = -errno; | |
2401 | goto fail; | |
2402 | } | |
2403 | ||
2404 | } else { | |
2405 | if (e->watchdog_fd >= 0) { | |
2406 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2407 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2408 | } |
2409 | } | |
2410 | ||
2411 | e->watchdog = !!b; | |
2412 | return e->watchdog; | |
2413 | ||
2414 | fail: | |
03e334a1 | 2415 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2416 | return r; |
2417 | } | |
8f726607 LP |
2418 | |
2419 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2420 | assert_return(e, -EINVAL); | |
2421 | assert_return(!event_pid_changed(e), -ECHILD); | |
2422 | ||
2423 | return e->watchdog; | |
2424 | } |