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fd38203a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/epoll.h> | |
23 | #include <sys/timerfd.h> | |
24 | #include <sys/wait.h> | |
3022d74b | 25 | #include <pthread.h> |
fd38203a | 26 | |
afc6adb5 | 27 | #include "sd-id128.h" |
cde93897 | 28 | #include "sd-daemon.h" |
fd38203a | 29 | #include "macro.h" |
fd38203a LP |
30 | #include "prioq.h" |
31 | #include "hashmap.h" | |
32 | #include "util.h" | |
33 | #include "time-util.h" | |
afc6adb5 | 34 | #include "missing.h" |
6e9feda3 | 35 | #include "set.h" |
a71fe8b8 | 36 | #include "list.h" |
fd38203a LP |
37 | |
38 | #include "sd-event.h" | |
39 | ||
15b38f93 | 40 | #define EPOLL_QUEUE_MAX 512U |
c2ba3ad6 | 41 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
42 | |
43 | typedef enum EventSourceType { | |
44 | SOURCE_IO, | |
6a0f1f6d | 45 | SOURCE_TIME_REALTIME, |
a8548816 | 46 | SOURCE_TIME_BOOTTIME, |
6a0f1f6d LP |
47 | SOURCE_TIME_MONOTONIC, |
48 | SOURCE_TIME_REALTIME_ALARM, | |
49 | SOURCE_TIME_BOOTTIME_ALARM, | |
fd38203a LP |
50 | SOURCE_SIGNAL, |
51 | SOURCE_CHILD, | |
da7e457c | 52 | SOURCE_DEFER, |
6e9feda3 | 53 | SOURCE_POST, |
6203e07a | 54 | SOURCE_EXIT, |
6a0f1f6d | 55 | SOURCE_WATCHDOG, |
a71fe8b8 | 56 | _SOURCE_EVENT_SOURCE_TYPE_MAX, |
6a0f1f6d | 57 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 |
fd38203a LP |
58 | } EventSourceType; |
59 | ||
a8548816 | 60 | #define EVENT_SOURCE_IS_TIME(t) IN_SET((t), SOURCE_TIME_REALTIME, SOURCE_TIME_BOOTTIME, SOURCE_TIME_MONOTONIC, SOURCE_TIME_REALTIME_ALARM, SOURCE_TIME_BOOTTIME_ALARM) |
6a0f1f6d | 61 | |
fd38203a | 62 | struct sd_event_source { |
da7e457c | 63 | unsigned n_ref; |
fd38203a LP |
64 | |
65 | sd_event *event; | |
66 | void *userdata; | |
718db961 | 67 | sd_event_handler_t prepare; |
fd38203a | 68 | |
6a0f1f6d | 69 | EventSourceType type:5; |
baf76283 | 70 | int enabled:3; |
fd38203a | 71 | bool pending:1; |
12179984 | 72 | bool dispatching:1; |
a71fe8b8 | 73 | bool floating:1; |
fd38203a | 74 | |
31927c16 | 75 | int64_t priority; |
fd38203a LP |
76 | unsigned pending_index; |
77 | unsigned prepare_index; | |
78 | unsigned pending_iteration; | |
79 | unsigned prepare_iteration; | |
80 | ||
a71fe8b8 LP |
81 | LIST_FIELDS(sd_event_source, sources); |
82 | ||
fd38203a LP |
83 | union { |
84 | struct { | |
718db961 | 85 | sd_event_io_handler_t callback; |
fd38203a LP |
86 | int fd; |
87 | uint32_t events; | |
88 | uint32_t revents; | |
89 | bool registered:1; | |
90 | } io; | |
91 | struct { | |
718db961 | 92 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
93 | usec_t next, accuracy; |
94 | unsigned earliest_index; | |
95 | unsigned latest_index; | |
fd38203a LP |
96 | } time; |
97 | struct { | |
718db961 | 98 | sd_event_signal_handler_t callback; |
fd38203a LP |
99 | struct signalfd_siginfo siginfo; |
100 | int sig; | |
101 | } signal; | |
102 | struct { | |
718db961 | 103 | sd_event_child_handler_t callback; |
fd38203a LP |
104 | siginfo_t siginfo; |
105 | pid_t pid; | |
106 | int options; | |
107 | } child; | |
108 | struct { | |
718db961 | 109 | sd_event_handler_t callback; |
fd38203a | 110 | } defer; |
6e9feda3 LP |
111 | struct { |
112 | sd_event_handler_t callback; | |
113 | } post; | |
da7e457c | 114 | struct { |
718db961 | 115 | sd_event_handler_t callback; |
da7e457c | 116 | unsigned prioq_index; |
6203e07a | 117 | } exit; |
fd38203a LP |
118 | }; |
119 | }; | |
120 | ||
6a0f1f6d LP |
121 | struct clock_data { |
122 | int fd; | |
123 | ||
124 | /* For all clocks we maintain two priority queues each, one | |
125 | * ordered for the earliest times the events may be | |
126 | * dispatched, and one ordered by the latest times they must | |
127 | * have been dispatched. The range between the top entries in | |
128 | * the two prioqs is the time window we can freely schedule | |
129 | * wakeups in */ | |
130 | ||
131 | Prioq *earliest; | |
132 | Prioq *latest; | |
133 | usec_t next; | |
212bbb17 TG |
134 | |
135 | bool needs_rearm:1; | |
6a0f1f6d LP |
136 | }; |
137 | ||
fd38203a | 138 | struct sd_event { |
da7e457c | 139 | unsigned n_ref; |
fd38203a LP |
140 | |
141 | int epoll_fd; | |
142 | int signal_fd; | |
cde93897 | 143 | int watchdog_fd; |
fd38203a LP |
144 | |
145 | Prioq *pending; | |
146 | Prioq *prepare; | |
c2ba3ad6 | 147 | |
a8548816 | 148 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
149 | * can add support for more clocks when the kernel learns to |
150 | * deal with them, too. */ | |
151 | struct clock_data realtime; | |
a8548816 | 152 | struct clock_data boottime; |
6a0f1f6d LP |
153 | struct clock_data monotonic; |
154 | struct clock_data realtime_alarm; | |
155 | struct clock_data boottime_alarm; | |
fd38203a | 156 | |
da7e457c LP |
157 | usec_t perturb; |
158 | ||
fd38203a LP |
159 | sigset_t sigset; |
160 | sd_event_source **signal_sources; | |
161 | ||
162 | Hashmap *child_sources; | |
baf76283 | 163 | unsigned n_enabled_child_sources; |
fd38203a | 164 | |
6e9feda3 LP |
165 | Set *post_sources; |
166 | ||
6203e07a | 167 | Prioq *exit; |
fd38203a | 168 | |
da7e457c | 169 | pid_t original_pid; |
c2ba3ad6 | 170 | |
da7e457c | 171 | unsigned iteration; |
46e8c825 | 172 | dual_timestamp timestamp; |
6a0f1f6d | 173 | usec_t timestamp_boottime; |
da7e457c | 174 | int state; |
eaa3cbef | 175 | |
6203e07a | 176 | bool exit_requested:1; |
da7e457c | 177 | bool need_process_child:1; |
cde93897 | 178 | bool watchdog:1; |
afc6adb5 | 179 | |
6203e07a LP |
180 | int exit_code; |
181 | ||
afc6adb5 LP |
182 | pid_t tid; |
183 | sd_event **default_event_ptr; | |
cde93897 LP |
184 | |
185 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
186 | |
187 | unsigned n_sources; | |
a71fe8b8 LP |
188 | |
189 | LIST_HEAD(sd_event_source, sources); | |
fd38203a LP |
190 | }; |
191 | ||
a71fe8b8 LP |
192 | static void source_disconnect(sd_event_source *s); |
193 | ||
fd38203a LP |
194 | static int pending_prioq_compare(const void *a, const void *b) { |
195 | const sd_event_source *x = a, *y = b; | |
196 | ||
197 | assert(x->pending); | |
198 | assert(y->pending); | |
199 | ||
baf76283 LP |
200 | /* Enabled ones first */ |
201 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 202 | return -1; |
baf76283 | 203 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
204 | return 1; |
205 | ||
206 | /* Lower priority values first */ | |
207 | if (x->priority < y->priority) | |
208 | return -1; | |
209 | if (x->priority > y->priority) | |
210 | return 1; | |
211 | ||
212 | /* Older entries first */ | |
213 | if (x->pending_iteration < y->pending_iteration) | |
214 | return -1; | |
215 | if (x->pending_iteration > y->pending_iteration) | |
216 | return 1; | |
217 | ||
218 | /* Stability for the rest */ | |
219 | if (x < y) | |
220 | return -1; | |
dfcd88f6 | 221 | if (x > y) |
fd38203a LP |
222 | return 1; |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | static int prepare_prioq_compare(const void *a, const void *b) { | |
228 | const sd_event_source *x = a, *y = b; | |
229 | ||
230 | assert(x->prepare); | |
231 | assert(y->prepare); | |
232 | ||
233 | /* Move most recently prepared ones last, so that we can stop | |
234 | * preparing as soon as we hit one that has already been | |
235 | * prepared in the current iteration */ | |
236 | if (x->prepare_iteration < y->prepare_iteration) | |
237 | return -1; | |
238 | if (x->prepare_iteration > y->prepare_iteration) | |
239 | return 1; | |
240 | ||
baf76283 LP |
241 | /* Enabled ones first */ |
242 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 243 | return -1; |
baf76283 | 244 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
245 | return 1; |
246 | ||
247 | /* Lower priority values first */ | |
248 | if (x->priority < y->priority) | |
249 | return -1; | |
250 | if (x->priority > y->priority) | |
251 | return 1; | |
252 | ||
253 | /* Stability for the rest */ | |
254 | if (x < y) | |
255 | return -1; | |
dfcd88f6 | 256 | if (x > y) |
fd38203a LP |
257 | return 1; |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
c2ba3ad6 | 262 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
263 | const sd_event_source *x = a, *y = b; |
264 | ||
6a0f1f6d LP |
265 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
266 | assert(x->type == y->type); | |
fd38203a | 267 | |
baf76283 LP |
268 | /* Enabled ones first */ |
269 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 270 | return -1; |
baf76283 | 271 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
272 | return 1; |
273 | ||
274 | /* Move the pending ones to the end */ | |
275 | if (!x->pending && y->pending) | |
276 | return -1; | |
277 | if (x->pending && !y->pending) | |
278 | return 1; | |
279 | ||
280 | /* Order by time */ | |
281 | if (x->time.next < y->time.next) | |
282 | return -1; | |
283 | if (x->time.next > y->time.next) | |
a99badf5 | 284 | return 1; |
fd38203a LP |
285 | |
286 | /* Stability for the rest */ | |
287 | if (x < y) | |
288 | return -1; | |
dfcd88f6 | 289 | if (x > y) |
fd38203a LP |
290 | return 1; |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
c2ba3ad6 LP |
295 | static int latest_time_prioq_compare(const void *a, const void *b) { |
296 | const sd_event_source *x = a, *y = b; | |
297 | ||
6a0f1f6d LP |
298 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
299 | assert(x->type == y->type); | |
c2ba3ad6 | 300 | |
baf76283 LP |
301 | /* Enabled ones first */ |
302 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 303 | return -1; |
baf76283 | 304 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
305 | return 1; |
306 | ||
307 | /* Move the pending ones to the end */ | |
308 | if (!x->pending && y->pending) | |
309 | return -1; | |
310 | if (x->pending && !y->pending) | |
311 | return 1; | |
312 | ||
313 | /* Order by time */ | |
314 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
315 | return -1; | |
316 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
a99badf5 | 317 | return 1; |
c2ba3ad6 LP |
318 | |
319 | /* Stability for the rest */ | |
320 | if (x < y) | |
321 | return -1; | |
322 | if (x > y) | |
323 | return 1; | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
6203e07a | 328 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
329 | const sd_event_source *x = a, *y = b; |
330 | ||
6203e07a LP |
331 | assert(x->type == SOURCE_EXIT); |
332 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 333 | |
baf76283 LP |
334 | /* Enabled ones first */ |
335 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 336 | return -1; |
baf76283 | 337 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
338 | return 1; |
339 | ||
340 | /* Lower priority values first */ | |
341 | if (x->priority < y->priority) | |
342 | return -1; | |
343 | if (x->priority > y->priority) | |
344 | return 1; | |
345 | ||
346 | /* Stability for the rest */ | |
347 | if (x < y) | |
348 | return -1; | |
349 | if (x > y) | |
350 | return 1; | |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
6a0f1f6d LP |
355 | static void free_clock_data(struct clock_data *d) { |
356 | assert(d); | |
357 | ||
358 | safe_close(d->fd); | |
359 | prioq_free(d->earliest); | |
360 | prioq_free(d->latest); | |
361 | } | |
362 | ||
fd38203a | 363 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
364 | sd_event_source *s; |
365 | ||
fd38203a | 366 | assert(e); |
a71fe8b8 LP |
367 | |
368 | while ((s = e->sources)) { | |
369 | assert(s->floating); | |
370 | source_disconnect(s); | |
371 | sd_event_source_unref(s); | |
372 | } | |
373 | ||
15b38f93 | 374 | assert(e->n_sources == 0); |
fd38203a | 375 | |
afc6adb5 LP |
376 | if (e->default_event_ptr) |
377 | *(e->default_event_ptr) = NULL; | |
378 | ||
03e334a1 LP |
379 | safe_close(e->epoll_fd); |
380 | safe_close(e->signal_fd); | |
03e334a1 | 381 | safe_close(e->watchdog_fd); |
cde93897 | 382 | |
6a0f1f6d | 383 | free_clock_data(&e->realtime); |
a8548816 | 384 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
385 | free_clock_data(&e->monotonic); |
386 | free_clock_data(&e->realtime_alarm); | |
387 | free_clock_data(&e->boottime_alarm); | |
388 | ||
fd38203a LP |
389 | prioq_free(e->pending); |
390 | prioq_free(e->prepare); | |
6203e07a | 391 | prioq_free(e->exit); |
fd38203a LP |
392 | |
393 | free(e->signal_sources); | |
394 | ||
395 | hashmap_free(e->child_sources); | |
6e9feda3 | 396 | set_free(e->post_sources); |
fd38203a LP |
397 | free(e); |
398 | } | |
399 | ||
f7262a9f | 400 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
401 | sd_event *e; |
402 | int r; | |
403 | ||
305f78bf | 404 | assert_return(ret, -EINVAL); |
fd38203a LP |
405 | |
406 | e = new0(sd_event, 1); | |
407 | if (!e) | |
408 | return -ENOMEM; | |
409 | ||
da7e457c | 410 | e->n_ref = 1; |
a8548816 | 411 | e->signal_fd = e->watchdog_fd = e->epoll_fd = e->realtime.fd = e->boottime.fd = e->monotonic.fd = e->realtime_alarm.fd = e->boottime_alarm.fd = -1; |
3a43da28 | 412 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
eaa3cbef | 413 | e->original_pid = getpid(); |
3a43da28 | 414 | e->perturb = USEC_INFINITY; |
fd38203a LP |
415 | |
416 | assert_se(sigemptyset(&e->sigset) == 0); | |
417 | ||
418 | e->pending = prioq_new(pending_prioq_compare); | |
419 | if (!e->pending) { | |
420 | r = -ENOMEM; | |
421 | goto fail; | |
422 | } | |
423 | ||
424 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
425 | if (e->epoll_fd < 0) { | |
426 | r = -errno; | |
427 | goto fail; | |
428 | } | |
429 | ||
430 | *ret = e; | |
431 | return 0; | |
432 | ||
433 | fail: | |
434 | event_free(e); | |
435 | return r; | |
436 | } | |
437 | ||
f7262a9f | 438 | _public_ sd_event* sd_event_ref(sd_event *e) { |
305f78bf | 439 | assert_return(e, NULL); |
fd38203a | 440 | |
da7e457c LP |
441 | assert(e->n_ref >= 1); |
442 | e->n_ref++; | |
fd38203a LP |
443 | |
444 | return e; | |
445 | } | |
446 | ||
f7262a9f | 447 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
448 | |
449 | if (!e) | |
450 | return NULL; | |
fd38203a | 451 | |
da7e457c LP |
452 | assert(e->n_ref >= 1); |
453 | e->n_ref--; | |
454 | ||
455 | if (e->n_ref <= 0) | |
fd38203a LP |
456 | event_free(e); |
457 | ||
458 | return NULL; | |
459 | } | |
460 | ||
eaa3cbef LP |
461 | static bool event_pid_changed(sd_event *e) { |
462 | assert(e); | |
463 | ||
464 | /* We don't support people creating am event loop and keeping | |
465 | * it around over a fork(). Let's complain. */ | |
466 | ||
467 | return e->original_pid != getpid(); | |
468 | } | |
469 | ||
fd38203a LP |
470 | static int source_io_unregister(sd_event_source *s) { |
471 | int r; | |
472 | ||
473 | assert(s); | |
474 | assert(s->type == SOURCE_IO); | |
475 | ||
476 | if (!s->io.registered) | |
477 | return 0; | |
478 | ||
479 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
480 | if (r < 0) | |
481 | return -errno; | |
482 | ||
483 | s->io.registered = false; | |
484 | return 0; | |
485 | } | |
486 | ||
305f78bf LP |
487 | static int source_io_register( |
488 | sd_event_source *s, | |
489 | int enabled, | |
490 | uint32_t events) { | |
491 | ||
fd38203a LP |
492 | struct epoll_event ev = {}; |
493 | int r; | |
494 | ||
495 | assert(s); | |
496 | assert(s->type == SOURCE_IO); | |
baf76283 | 497 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
498 | |
499 | ev.events = events; | |
500 | ev.data.ptr = s; | |
501 | ||
baf76283 | 502 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
503 | ev.events |= EPOLLONESHOT; |
504 | ||
505 | if (s->io.registered) | |
506 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
507 | else | |
508 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
509 | ||
510 | if (r < 0) | |
511 | return -errno; | |
512 | ||
513 | s->io.registered = true; | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
6a0f1f6d LP |
518 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
519 | ||
520 | switch (t) { | |
521 | ||
522 | case SOURCE_TIME_REALTIME: | |
523 | return CLOCK_REALTIME; | |
524 | ||
a8548816 TG |
525 | case SOURCE_TIME_BOOTTIME: |
526 | return CLOCK_BOOTTIME; | |
527 | ||
6a0f1f6d LP |
528 | case SOURCE_TIME_MONOTONIC: |
529 | return CLOCK_MONOTONIC; | |
530 | ||
531 | case SOURCE_TIME_REALTIME_ALARM: | |
532 | return CLOCK_REALTIME_ALARM; | |
533 | ||
534 | case SOURCE_TIME_BOOTTIME_ALARM: | |
535 | return CLOCK_BOOTTIME_ALARM; | |
536 | ||
537 | default: | |
538 | return (clockid_t) -1; | |
539 | } | |
540 | } | |
541 | ||
542 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
543 | ||
544 | switch (clock) { | |
545 | ||
546 | case CLOCK_REALTIME: | |
547 | return SOURCE_TIME_REALTIME; | |
548 | ||
a8548816 TG |
549 | case CLOCK_BOOTTIME: |
550 | return SOURCE_TIME_BOOTTIME; | |
551 | ||
6a0f1f6d LP |
552 | case CLOCK_MONOTONIC: |
553 | return SOURCE_TIME_MONOTONIC; | |
554 | ||
555 | case CLOCK_REALTIME_ALARM: | |
556 | return SOURCE_TIME_REALTIME_ALARM; | |
557 | ||
558 | case CLOCK_BOOTTIME_ALARM: | |
559 | return SOURCE_TIME_BOOTTIME_ALARM; | |
560 | ||
561 | default: | |
562 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
563 | } | |
564 | } | |
565 | ||
566 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
567 | assert(e); | |
568 | ||
569 | switch (t) { | |
570 | ||
571 | case SOURCE_TIME_REALTIME: | |
572 | return &e->realtime; | |
573 | ||
a8548816 TG |
574 | case SOURCE_TIME_BOOTTIME: |
575 | return &e->boottime; | |
576 | ||
6a0f1f6d LP |
577 | case SOURCE_TIME_MONOTONIC: |
578 | return &e->monotonic; | |
579 | ||
580 | case SOURCE_TIME_REALTIME_ALARM: | |
581 | return &e->realtime_alarm; | |
582 | ||
583 | case SOURCE_TIME_BOOTTIME_ALARM: | |
584 | return &e->boottime_alarm; | |
585 | ||
586 | default: | |
587 | return NULL; | |
588 | } | |
589 | } | |
590 | ||
a71fe8b8 LP |
591 | static void source_disconnect(sd_event_source *s) { |
592 | sd_event *event; | |
593 | ||
fd38203a LP |
594 | assert(s); |
595 | ||
a71fe8b8 LP |
596 | if (!s->event) |
597 | return; | |
15b38f93 | 598 | |
a71fe8b8 | 599 | assert(s->event->n_sources > 0); |
fd38203a | 600 | |
a71fe8b8 | 601 | switch (s->type) { |
fd38203a | 602 | |
a71fe8b8 LP |
603 | case SOURCE_IO: |
604 | if (s->io.fd >= 0) | |
605 | source_io_unregister(s); | |
fd38203a | 606 | |
a71fe8b8 | 607 | break; |
6a0f1f6d | 608 | |
a71fe8b8 | 609 | case SOURCE_TIME_REALTIME: |
a8548816 | 610 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
611 | case SOURCE_TIME_MONOTONIC: |
612 | case SOURCE_TIME_REALTIME_ALARM: | |
613 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
614 | struct clock_data *d; | |
fd38203a | 615 | |
a71fe8b8 LP |
616 | d = event_get_clock_data(s->event, s->type); |
617 | assert(d); | |
618 | ||
619 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
620 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 621 | d->needs_rearm = true; |
a71fe8b8 LP |
622 | break; |
623 | } | |
624 | ||
625 | case SOURCE_SIGNAL: | |
626 | if (s->signal.sig > 0) { | |
627 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) | |
628 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); | |
629 | ||
630 | if (s->event->signal_sources) | |
631 | s->event->signal_sources[s->signal.sig] = NULL; | |
6a0f1f6d | 632 | } |
fd38203a | 633 | |
a71fe8b8 | 634 | break; |
fd38203a | 635 | |
a71fe8b8 LP |
636 | case SOURCE_CHILD: |
637 | if (s->child.pid > 0) { | |
638 | if (s->enabled != SD_EVENT_OFF) { | |
639 | assert(s->event->n_enabled_child_sources > 0); | |
640 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
641 | } |
642 | ||
a71fe8b8 LP |
643 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) |
644 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
fd38203a | 645 | |
a71fe8b8 LP |
646 | hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid)); |
647 | } | |
fd38203a | 648 | |
a71fe8b8 | 649 | break; |
fd38203a | 650 | |
a71fe8b8 LP |
651 | case SOURCE_DEFER: |
652 | /* nothing */ | |
653 | break; | |
fd38203a | 654 | |
a71fe8b8 LP |
655 | case SOURCE_POST: |
656 | set_remove(s->event->post_sources, s); | |
657 | break; | |
da7e457c | 658 | |
a71fe8b8 LP |
659 | case SOURCE_EXIT: |
660 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
661 | break; | |
0eb2e0e3 | 662 | |
a71fe8b8 LP |
663 | default: |
664 | assert_not_reached("Wut? I shouldn't exist."); | |
665 | } | |
6e9feda3 | 666 | |
a71fe8b8 LP |
667 | if (s->pending) |
668 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 669 | |
a71fe8b8 LP |
670 | if (s->prepare) |
671 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 672 | |
a71fe8b8 | 673 | event = s->event; |
fd38203a | 674 | |
a71fe8b8 LP |
675 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
676 | s->event = NULL; | |
677 | LIST_REMOVE(sources, event->sources, s); | |
678 | event->n_sources--; | |
fd38203a | 679 | |
a71fe8b8 LP |
680 | if (!s->floating) |
681 | sd_event_unref(event); | |
682 | } | |
683 | ||
684 | static void source_free(sd_event_source *s) { | |
685 | assert(s); | |
fd38203a | 686 | |
a71fe8b8 | 687 | source_disconnect(s); |
fd38203a LP |
688 | free(s); |
689 | } | |
690 | ||
691 | static int source_set_pending(sd_event_source *s, bool b) { | |
692 | int r; | |
693 | ||
694 | assert(s); | |
6203e07a | 695 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
696 | |
697 | if (s->pending == b) | |
698 | return 0; | |
699 | ||
700 | s->pending = b; | |
701 | ||
702 | if (b) { | |
703 | s->pending_iteration = s->event->iteration; | |
704 | ||
705 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
706 | if (r < 0) { | |
707 | s->pending = false; | |
708 | return r; | |
709 | } | |
710 | } else | |
711 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
712 | ||
6a0f1f6d LP |
713 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
714 | struct clock_data *d; | |
715 | ||
716 | d = event_get_clock_data(s->event, s->type); | |
717 | assert(d); | |
718 | ||
719 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
720 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 721 | d->needs_rearm = true; |
2576a19e LP |
722 | } |
723 | ||
fd38203a LP |
724 | return 0; |
725 | } | |
726 | ||
a71fe8b8 | 727 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
728 | sd_event_source *s; |
729 | ||
730 | assert(e); | |
731 | ||
732 | s = new0(sd_event_source, 1); | |
733 | if (!s) | |
734 | return NULL; | |
735 | ||
da7e457c | 736 | s->n_ref = 1; |
a71fe8b8 | 737 | s->event = e; |
4a134c49 | 738 | s->floating = floating; |
fd38203a | 739 | s->type = type; |
fd38203a | 740 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
741 | |
742 | if (!floating) | |
743 | sd_event_ref(e); | |
fd38203a | 744 | |
a71fe8b8 | 745 | LIST_PREPEND(sources, e->sources, s); |
15b38f93 LP |
746 | e->n_sources ++; |
747 | ||
fd38203a LP |
748 | return s; |
749 | } | |
750 | ||
f7262a9f | 751 | _public_ int sd_event_add_io( |
fd38203a | 752 | sd_event *e, |
151b9b96 | 753 | sd_event_source **ret, |
fd38203a LP |
754 | int fd, |
755 | uint32_t events, | |
718db961 | 756 | sd_event_io_handler_t callback, |
151b9b96 | 757 | void *userdata) { |
fd38203a LP |
758 | |
759 | sd_event_source *s; | |
760 | int r; | |
761 | ||
305f78bf LP |
762 | assert_return(e, -EINVAL); |
763 | assert_return(fd >= 0, -EINVAL); | |
2a16a986 | 764 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 765 | assert_return(callback, -EINVAL); |
da7e457c | 766 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 767 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 768 | |
a71fe8b8 | 769 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
770 | if (!s) |
771 | return -ENOMEM; | |
772 | ||
773 | s->io.fd = fd; | |
774 | s->io.events = events; | |
775 | s->io.callback = callback; | |
776 | s->userdata = userdata; | |
baf76283 | 777 | s->enabled = SD_EVENT_ON; |
fd38203a | 778 | |
baf76283 | 779 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
780 | if (r < 0) { |
781 | source_free(s); | |
782 | return -errno; | |
783 | } | |
784 | ||
a71fe8b8 LP |
785 | if (ret) |
786 | *ret = s; | |
787 | ||
fd38203a LP |
788 | return 0; |
789 | } | |
790 | ||
52444dc4 LP |
791 | static void initialize_perturb(sd_event *e) { |
792 | sd_id128_t bootid = {}; | |
793 | ||
794 | /* When we sleep for longer, we try to realign the wakeup to | |
795 | the same time wihtin each minute/second/250ms, so that | |
796 | events all across the system can be coalesced into a single | |
797 | CPU wakeup. However, let's take some system-specific | |
798 | randomness for this value, so that in a network of systems | |
799 | with synced clocks timer events are distributed a | |
800 | bit. Here, we calculate a perturbation usec offset from the | |
801 | boot ID. */ | |
802 | ||
3a43da28 | 803 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
804 | return; |
805 | ||
806 | if (sd_id128_get_boot(&bootid) >= 0) | |
807 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
808 | } | |
809 | ||
fd38203a LP |
810 | static int event_setup_timer_fd( |
811 | sd_event *e, | |
6a0f1f6d LP |
812 | struct clock_data *d, |
813 | clockid_t clock) { | |
fd38203a LP |
814 | |
815 | struct epoll_event ev = {}; | |
816 | int r, fd; | |
817 | ||
818 | assert(e); | |
6a0f1f6d | 819 | assert(d); |
fd38203a | 820 | |
6a0f1f6d | 821 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
822 | return 0; |
823 | ||
6a0f1f6d | 824 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
825 | if (fd < 0) |
826 | return -errno; | |
827 | ||
828 | ev.events = EPOLLIN; | |
6a0f1f6d | 829 | ev.data.ptr = INT_TO_PTR(clock_to_event_source_type(clock)); |
fd38203a LP |
830 | |
831 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
832 | if (r < 0) { | |
03e334a1 | 833 | safe_close(fd); |
fd38203a LP |
834 | return -errno; |
835 | } | |
836 | ||
6a0f1f6d | 837 | d->fd = fd; |
fd38203a LP |
838 | return 0; |
839 | } | |
840 | ||
6a0f1f6d | 841 | _public_ int sd_event_add_time( |
fd38203a | 842 | sd_event *e, |
151b9b96 | 843 | sd_event_source **ret, |
6a0f1f6d | 844 | clockid_t clock, |
fd38203a | 845 | uint64_t usec, |
c2ba3ad6 | 846 | uint64_t accuracy, |
718db961 | 847 | sd_event_time_handler_t callback, |
151b9b96 | 848 | void *userdata) { |
fd38203a | 849 | |
6a0f1f6d | 850 | EventSourceType type; |
fd38203a | 851 | sd_event_source *s; |
6a0f1f6d | 852 | struct clock_data *d; |
fd38203a LP |
853 | int r; |
854 | ||
305f78bf | 855 | assert_return(e, -EINVAL); |
305f78bf LP |
856 | assert_return(usec != (uint64_t) -1, -EINVAL); |
857 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 858 | assert_return(callback, -EINVAL); |
da7e457c | 859 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 860 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 861 | |
6a0f1f6d LP |
862 | type = clock_to_event_source_type(clock); |
863 | assert_return(type >= 0, -ENOTSUP); | |
864 | ||
865 | d = event_get_clock_data(e, type); | |
866 | assert(d); | |
c2ba3ad6 | 867 | |
6a0f1f6d LP |
868 | if (!d->earliest) { |
869 | d->earliest = prioq_new(earliest_time_prioq_compare); | |
870 | if (!d->earliest) | |
c2ba3ad6 LP |
871 | return -ENOMEM; |
872 | } | |
fd38203a | 873 | |
6a0f1f6d LP |
874 | if (!d->latest) { |
875 | d->latest = prioq_new(latest_time_prioq_compare); | |
876 | if (!d->latest) | |
fd38203a LP |
877 | return -ENOMEM; |
878 | } | |
879 | ||
6a0f1f6d LP |
880 | if (d->fd < 0) { |
881 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
882 | if (r < 0) |
883 | return r; | |
884 | } | |
885 | ||
a71fe8b8 | 886 | s = source_new(e, !ret, type); |
fd38203a LP |
887 | if (!s) |
888 | return -ENOMEM; | |
889 | ||
890 | s->time.next = usec; | |
c2ba3ad6 | 891 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 892 | s->time.callback = callback; |
da7e457c | 893 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 894 | s->userdata = userdata; |
baf76283 | 895 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 896 | |
e07bbb7c TG |
897 | d->needs_rearm = true; |
898 | ||
6a0f1f6d | 899 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
900 | if (r < 0) |
901 | goto fail; | |
902 | ||
6a0f1f6d | 903 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
904 | if (r < 0) |
905 | goto fail; | |
fd38203a | 906 | |
a71fe8b8 LP |
907 | if (ret) |
908 | *ret = s; | |
909 | ||
fd38203a | 910 | return 0; |
c2ba3ad6 LP |
911 | |
912 | fail: | |
913 | source_free(s); | |
914 | return r; | |
fd38203a LP |
915 | } |
916 | ||
fd38203a LP |
917 | static int event_update_signal_fd(sd_event *e) { |
918 | struct epoll_event ev = {}; | |
919 | bool add_to_epoll; | |
920 | int r; | |
921 | ||
922 | assert(e); | |
923 | ||
924 | add_to_epoll = e->signal_fd < 0; | |
925 | ||
926 | r = signalfd(e->signal_fd, &e->sigset, SFD_NONBLOCK|SFD_CLOEXEC); | |
927 | if (r < 0) | |
928 | return -errno; | |
929 | ||
930 | e->signal_fd = r; | |
931 | ||
932 | if (!add_to_epoll) | |
933 | return 0; | |
934 | ||
935 | ev.events = EPOLLIN; | |
936 | ev.data.ptr = INT_TO_PTR(SOURCE_SIGNAL); | |
937 | ||
938 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->signal_fd, &ev); | |
939 | if (r < 0) { | |
03e334a1 | 940 | e->signal_fd = safe_close(e->signal_fd); |
fd38203a LP |
941 | return -errno; |
942 | } | |
943 | ||
944 | return 0; | |
945 | } | |
946 | ||
59bc1fd7 LP |
947 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
948 | assert(s); | |
949 | ||
950 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
951 | } | |
952 | ||
f7262a9f | 953 | _public_ int sd_event_add_signal( |
305f78bf | 954 | sd_event *e, |
151b9b96 | 955 | sd_event_source **ret, |
305f78bf | 956 | int sig, |
718db961 | 957 | sd_event_signal_handler_t callback, |
151b9b96 | 958 | void *userdata) { |
305f78bf | 959 | |
fd38203a | 960 | sd_event_source *s; |
3022d74b | 961 | sigset_t ss; |
fd38203a LP |
962 | int r; |
963 | ||
305f78bf LP |
964 | assert_return(e, -EINVAL); |
965 | assert_return(sig > 0, -EINVAL); | |
966 | assert_return(sig < _NSIG, -EINVAL); | |
da7e457c | 967 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 968 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 969 | |
59bc1fd7 LP |
970 | if (!callback) |
971 | callback = signal_exit_callback; | |
972 | ||
3022d74b LP |
973 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
974 | if (r < 0) | |
975 | return -errno; | |
976 | ||
977 | if (!sigismember(&ss, sig)) | |
978 | return -EBUSY; | |
979 | ||
fd38203a LP |
980 | if (!e->signal_sources) { |
981 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
982 | if (!e->signal_sources) | |
983 | return -ENOMEM; | |
984 | } else if (e->signal_sources[sig]) | |
985 | return -EBUSY; | |
986 | ||
a71fe8b8 | 987 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
988 | if (!s) |
989 | return -ENOMEM; | |
990 | ||
991 | s->signal.sig = sig; | |
992 | s->signal.callback = callback; | |
993 | s->userdata = userdata; | |
baf76283 | 994 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
995 | |
996 | e->signal_sources[sig] = s; | |
997 | assert_se(sigaddset(&e->sigset, sig) == 0); | |
998 | ||
baf76283 | 999 | if (sig != SIGCHLD || e->n_enabled_child_sources == 0) { |
fd38203a LP |
1000 | r = event_update_signal_fd(e); |
1001 | if (r < 0) { | |
1002 | source_free(s); | |
1003 | return r; | |
1004 | } | |
1005 | } | |
1006 | ||
a71fe8b8 LP |
1007 | if (ret) |
1008 | *ret = s; | |
1009 | ||
fd38203a LP |
1010 | return 0; |
1011 | } | |
1012 | ||
f7262a9f | 1013 | _public_ int sd_event_add_child( |
305f78bf | 1014 | sd_event *e, |
151b9b96 | 1015 | sd_event_source **ret, |
305f78bf LP |
1016 | pid_t pid, |
1017 | int options, | |
718db961 | 1018 | sd_event_child_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(pid > 1, -EINVAL); | |
1026 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1027 | assert_return(options != 0, -EINVAL); | |
1028 | assert_return(callback, -EINVAL); | |
da7e457c | 1029 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1030 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a LP |
1031 | |
1032 | r = hashmap_ensure_allocated(&e->child_sources, trivial_hash_func, trivial_compare_func); | |
1033 | if (r < 0) | |
1034 | return r; | |
1035 | ||
1036 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
1037 | return -EBUSY; | |
1038 | ||
a71fe8b8 | 1039 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1040 | if (!s) |
1041 | return -ENOMEM; | |
1042 | ||
1043 | s->child.pid = pid; | |
1044 | s->child.options = options; | |
1045 | s->child.callback = callback; | |
1046 | s->userdata = userdata; | |
baf76283 | 1047 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1048 | |
1049 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
1050 | if (r < 0) { | |
1051 | source_free(s); | |
1052 | return r; | |
1053 | } | |
1054 | ||
baf76283 | 1055 | e->n_enabled_child_sources ++; |
fd38203a LP |
1056 | |
1057 | assert_se(sigaddset(&e->sigset, SIGCHLD) == 0); | |
1058 | ||
1059 | if (!e->signal_sources || !e->signal_sources[SIGCHLD]) { | |
1060 | r = event_update_signal_fd(e); | |
1061 | if (r < 0) { | |
1062 | source_free(s); | |
1063 | return -errno; | |
1064 | } | |
1065 | } | |
1066 | ||
c2ba3ad6 LP |
1067 | e->need_process_child = true; |
1068 | ||
a71fe8b8 LP |
1069 | if (ret) |
1070 | *ret = s; | |
1071 | ||
fd38203a LP |
1072 | return 0; |
1073 | } | |
1074 | ||
f7262a9f | 1075 | _public_ int sd_event_add_defer( |
305f78bf | 1076 | sd_event *e, |
151b9b96 | 1077 | sd_event_source **ret, |
718db961 | 1078 | sd_event_handler_t callback, |
151b9b96 | 1079 | void *userdata) { |
305f78bf | 1080 | |
fd38203a LP |
1081 | sd_event_source *s; |
1082 | int r; | |
1083 | ||
305f78bf LP |
1084 | assert_return(e, -EINVAL); |
1085 | assert_return(callback, -EINVAL); | |
da7e457c | 1086 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1087 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1088 | |
a71fe8b8 | 1089 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1090 | if (!s) |
1091 | return -ENOMEM; | |
1092 | ||
1093 | s->defer.callback = callback; | |
1094 | s->userdata = userdata; | |
baf76283 | 1095 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1096 | |
1097 | r = source_set_pending(s, true); | |
1098 | if (r < 0) { | |
1099 | source_free(s); | |
1100 | return r; | |
1101 | } | |
1102 | ||
a71fe8b8 LP |
1103 | if (ret) |
1104 | *ret = s; | |
1105 | ||
fd38203a LP |
1106 | return 0; |
1107 | } | |
1108 | ||
6e9feda3 LP |
1109 | _public_ int sd_event_add_post( |
1110 | sd_event *e, | |
1111 | sd_event_source **ret, | |
1112 | sd_event_handler_t callback, | |
1113 | void *userdata) { | |
1114 | ||
1115 | sd_event_source *s; | |
1116 | int r; | |
1117 | ||
1118 | assert_return(e, -EINVAL); | |
1119 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1120 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1121 | assert_return(!event_pid_changed(e), -ECHILD); | |
1122 | ||
1123 | r = set_ensure_allocated(&e->post_sources, trivial_hash_func, trivial_compare_func); | |
1124 | if (r < 0) | |
1125 | return r; | |
1126 | ||
a71fe8b8 | 1127 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1128 | if (!s) |
1129 | return -ENOMEM; | |
1130 | ||
1131 | s->post.callback = callback; | |
1132 | s->userdata = userdata; | |
1133 | s->enabled = SD_EVENT_ON; | |
1134 | ||
1135 | r = set_put(e->post_sources, s); | |
1136 | if (r < 0) { | |
1137 | source_free(s); | |
1138 | return r; | |
1139 | } | |
1140 | ||
a71fe8b8 LP |
1141 | if (ret) |
1142 | *ret = s; | |
1143 | ||
6e9feda3 LP |
1144 | return 0; |
1145 | } | |
1146 | ||
6203e07a | 1147 | _public_ int sd_event_add_exit( |
305f78bf | 1148 | sd_event *e, |
151b9b96 | 1149 | sd_event_source **ret, |
718db961 | 1150 | sd_event_handler_t callback, |
151b9b96 | 1151 | void *userdata) { |
305f78bf | 1152 | |
da7e457c LP |
1153 | sd_event_source *s; |
1154 | int r; | |
1155 | ||
1156 | assert_return(e, -EINVAL); | |
1157 | assert_return(callback, -EINVAL); | |
1158 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1159 | assert_return(!event_pid_changed(e), -ECHILD); | |
1160 | ||
6203e07a LP |
1161 | if (!e->exit) { |
1162 | e->exit = prioq_new(exit_prioq_compare); | |
1163 | if (!e->exit) | |
da7e457c LP |
1164 | return -ENOMEM; |
1165 | } | |
1166 | ||
a71fe8b8 | 1167 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1168 | if (!s) |
da7e457c | 1169 | return -ENOMEM; |
fd38203a | 1170 | |
6203e07a | 1171 | s->exit.callback = callback; |
da7e457c | 1172 | s->userdata = userdata; |
6203e07a | 1173 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1174 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1175 | |
6203e07a | 1176 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1177 | if (r < 0) { |
1178 | source_free(s); | |
1179 | return r; | |
1180 | } | |
1181 | ||
a71fe8b8 LP |
1182 | if (ret) |
1183 | *ret = s; | |
1184 | ||
da7e457c LP |
1185 | return 0; |
1186 | } | |
1187 | ||
f7262a9f | 1188 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
da7e457c LP |
1189 | assert_return(s, NULL); |
1190 | ||
1191 | assert(s->n_ref >= 1); | |
1192 | s->n_ref++; | |
fd38203a LP |
1193 | |
1194 | return s; | |
1195 | } | |
1196 | ||
f7262a9f | 1197 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1198 | |
1199 | if (!s) | |
1200 | return NULL; | |
fd38203a | 1201 | |
da7e457c LP |
1202 | assert(s->n_ref >= 1); |
1203 | s->n_ref--; | |
1204 | ||
12179984 LP |
1205 | if (s->n_ref <= 0) { |
1206 | /* Here's a special hack: when we are called from a | |
1207 | * dispatch handler we won't free the event source | |
1208 | * immediately, but we will detach the fd from the | |
1209 | * epoll. This way it is safe for the caller to unref | |
1210 | * the event source and immediately close the fd, but | |
1211 | * we still retain a valid event source object after | |
1212 | * the callback. */ | |
1213 | ||
1214 | if (s->dispatching) { | |
1215 | if (s->type == SOURCE_IO) | |
1216 | source_io_unregister(s); | |
a71fe8b8 LP |
1217 | |
1218 | source_disconnect(s); | |
12179984 LP |
1219 | } else |
1220 | source_free(s); | |
1221 | } | |
fd38203a LP |
1222 | |
1223 | return NULL; | |
1224 | } | |
1225 | ||
adcc4ca3 | 1226 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1227 | assert_return(s, NULL); |
eaa3cbef LP |
1228 | |
1229 | return s->event; | |
1230 | } | |
1231 | ||
f7262a9f | 1232 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1233 | assert_return(s, -EINVAL); |
6203e07a | 1234 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1235 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1236 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1237 | |
1238 | return s->pending; | |
1239 | } | |
1240 | ||
f7262a9f | 1241 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1242 | assert_return(s, -EINVAL); |
1243 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1244 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1245 | |
1246 | return s->io.fd; | |
1247 | } | |
1248 | ||
30caf8f3 LP |
1249 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1250 | int r; | |
1251 | ||
1252 | assert_return(s, -EINVAL); | |
1253 | assert_return(fd >= 0, -EINVAL); | |
1254 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1255 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1256 | ||
1257 | if (s->io.fd == fd) | |
1258 | return 0; | |
1259 | ||
1260 | if (s->enabled == SD_EVENT_OFF) { | |
1261 | s->io.fd = fd; | |
1262 | s->io.registered = false; | |
1263 | } else { | |
1264 | int saved_fd; | |
1265 | ||
1266 | saved_fd = s->io.fd; | |
1267 | assert(s->io.registered); | |
1268 | ||
1269 | s->io.fd = fd; | |
1270 | s->io.registered = false; | |
1271 | ||
1272 | r = source_io_register(s, s->enabled, s->io.events); | |
1273 | if (r < 0) { | |
1274 | s->io.fd = saved_fd; | |
1275 | s->io.registered = true; | |
1276 | return r; | |
1277 | } | |
1278 | ||
1279 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1280 | } | |
1281 | ||
1282 | return 0; | |
1283 | } | |
1284 | ||
f7262a9f | 1285 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1286 | assert_return(s, -EINVAL); |
1287 | assert_return(events, -EINVAL); | |
1288 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1289 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1290 | |
1291 | *events = s->io.events; | |
1292 | return 0; | |
1293 | } | |
1294 | ||
f7262a9f | 1295 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1296 | int r; |
1297 | ||
305f78bf LP |
1298 | assert_return(s, -EINVAL); |
1299 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1300 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1301 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1302 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1303 | |
b63c8d4f DH |
1304 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1305 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1306 | return 0; |
1307 | ||
baf76283 | 1308 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1309 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1310 | if (r < 0) |
1311 | return r; | |
1312 | } | |
1313 | ||
1314 | s->io.events = events; | |
503f39c3 | 1315 | source_set_pending(s, false); |
fd38203a LP |
1316 | |
1317 | return 0; | |
1318 | } | |
1319 | ||
f7262a9f | 1320 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1321 | assert_return(s, -EINVAL); |
1322 | assert_return(revents, -EINVAL); | |
1323 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1324 | assert_return(s->pending, -ENODATA); | |
1325 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1326 | |
1327 | *revents = s->io.revents; | |
1328 | return 0; | |
1329 | } | |
1330 | ||
f7262a9f | 1331 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1332 | assert_return(s, -EINVAL); |
1333 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1334 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1335 | |
1336 | return s->signal.sig; | |
1337 | } | |
1338 | ||
31927c16 | 1339 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1340 | assert_return(s, -EINVAL); |
1341 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1342 | |
1343 | return s->priority; | |
1344 | } | |
1345 | ||
31927c16 | 1346 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
305f78bf | 1347 | assert_return(s, -EINVAL); |
da7e457c | 1348 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1349 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1350 | |
1351 | if (s->priority == priority) | |
1352 | return 0; | |
1353 | ||
1354 | s->priority = priority; | |
1355 | ||
1356 | if (s->pending) | |
c2ba3ad6 | 1357 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1358 | |
1359 | if (s->prepare) | |
c2ba3ad6 | 1360 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1361 | |
6203e07a LP |
1362 | if (s->type == SOURCE_EXIT) |
1363 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1364 | |
fd38203a LP |
1365 | return 0; |
1366 | } | |
1367 | ||
f7262a9f | 1368 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1369 | assert_return(s, -EINVAL); |
1370 | assert_return(m, -EINVAL); | |
1371 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1372 | |
baf76283 | 1373 | *m = s->enabled; |
fd38203a LP |
1374 | return 0; |
1375 | } | |
1376 | ||
f7262a9f | 1377 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1378 | int r; |
1379 | ||
305f78bf LP |
1380 | assert_return(s, -EINVAL); |
1381 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
305f78bf | 1382 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1383 | |
cc567911 LP |
1384 | /* If we are dead anyway, we are fine with turning off |
1385 | * sources, but everything else needs to fail. */ | |
1386 | if (s->event->state == SD_EVENT_FINISHED) | |
1387 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1388 | ||
baf76283 | 1389 | if (s->enabled == m) |
fd38203a LP |
1390 | return 0; |
1391 | ||
baf76283 | 1392 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1393 | |
1394 | switch (s->type) { | |
1395 | ||
1396 | case SOURCE_IO: | |
1397 | r = source_io_unregister(s); | |
1398 | if (r < 0) | |
1399 | return r; | |
1400 | ||
baf76283 | 1401 | s->enabled = m; |
fd38203a LP |
1402 | break; |
1403 | ||
6a0f1f6d | 1404 | case SOURCE_TIME_REALTIME: |
a8548816 | 1405 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1406 | case SOURCE_TIME_MONOTONIC: |
1407 | case SOURCE_TIME_REALTIME_ALARM: | |
1408 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1409 | struct clock_data *d; | |
fd38203a | 1410 | |
baf76283 | 1411 | s->enabled = m; |
6a0f1f6d LP |
1412 | d = event_get_clock_data(s->event, s->type); |
1413 | assert(d); | |
1414 | ||
1415 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1416 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1417 | d->needs_rearm = true; |
fd38203a | 1418 | break; |
6a0f1f6d | 1419 | } |
fd38203a LP |
1420 | |
1421 | case SOURCE_SIGNAL: | |
baf76283 LP |
1422 | s->enabled = m; |
1423 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { | |
fd38203a LP |
1424 | assert_se(sigdelset(&s->event->sigset, s->signal.sig) == 0); |
1425 | event_update_signal_fd(s->event); | |
1426 | } | |
1427 | ||
1428 | break; | |
1429 | ||
1430 | case SOURCE_CHILD: | |
baf76283 | 1431 | s->enabled = m; |
fd38203a | 1432 | |
baf76283 LP |
1433 | assert(s->event->n_enabled_child_sources > 0); |
1434 | s->event->n_enabled_child_sources--; | |
fd38203a LP |
1435 | |
1436 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1437 | assert_se(sigdelset(&s->event->sigset, SIGCHLD) == 0); | |
1438 | event_update_signal_fd(s->event); | |
1439 | } | |
1440 | ||
1441 | break; | |
1442 | ||
6203e07a | 1443 | case SOURCE_EXIT: |
305f78bf | 1444 | s->enabled = m; |
6203e07a | 1445 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1446 | break; |
1447 | ||
1448 | case SOURCE_DEFER: | |
6e9feda3 | 1449 | case SOURCE_POST: |
baf76283 | 1450 | s->enabled = m; |
fd38203a | 1451 | break; |
9d3e3aa5 | 1452 | |
6a0f1f6d | 1453 | default: |
9d3e3aa5 | 1454 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1455 | } |
1456 | ||
1457 | } else { | |
1458 | switch (s->type) { | |
1459 | ||
1460 | case SOURCE_IO: | |
1461 | r = source_io_register(s, m, s->io.events); | |
1462 | if (r < 0) | |
1463 | return r; | |
1464 | ||
baf76283 | 1465 | s->enabled = m; |
fd38203a LP |
1466 | break; |
1467 | ||
6a0f1f6d | 1468 | case SOURCE_TIME_REALTIME: |
a8548816 | 1469 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1470 | case SOURCE_TIME_MONOTONIC: |
1471 | case SOURCE_TIME_REALTIME_ALARM: | |
1472 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1473 | struct clock_data *d; | |
fd38203a | 1474 | |
baf76283 | 1475 | s->enabled = m; |
6a0f1f6d LP |
1476 | d = event_get_clock_data(s->event, s->type); |
1477 | assert(d); | |
1478 | ||
1479 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1480 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1481 | d->needs_rearm = true; |
fd38203a | 1482 | break; |
6a0f1f6d | 1483 | } |
fd38203a LP |
1484 | |
1485 | case SOURCE_SIGNAL: | |
baf76283 | 1486 | s->enabled = m; |
fd38203a | 1487 | |
baf76283 | 1488 | if (s->signal.sig != SIGCHLD || s->event->n_enabled_child_sources == 0) { |
fd38203a LP |
1489 | assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0); |
1490 | event_update_signal_fd(s->event); | |
1491 | } | |
1492 | break; | |
1493 | ||
1494 | case SOURCE_CHILD: | |
baf76283 LP |
1495 | if (s->enabled == SD_EVENT_OFF) { |
1496 | s->event->n_enabled_child_sources++; | |
fd38203a LP |
1497 | |
1498 | if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) { | |
1499 | assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0); | |
1500 | event_update_signal_fd(s->event); | |
1501 | } | |
1502 | } | |
7a0d4a3d DH |
1503 | |
1504 | s->enabled = m; | |
fd38203a LP |
1505 | break; |
1506 | ||
6203e07a | 1507 | case SOURCE_EXIT: |
305f78bf | 1508 | s->enabled = m; |
6203e07a | 1509 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1510 | break; |
1511 | ||
1512 | case SOURCE_DEFER: | |
6e9feda3 | 1513 | case SOURCE_POST: |
baf76283 | 1514 | s->enabled = m; |
fd38203a | 1515 | break; |
9d3e3aa5 | 1516 | |
6a0f1f6d | 1517 | default: |
9d3e3aa5 | 1518 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1519 | } |
1520 | } | |
1521 | ||
1522 | if (s->pending) | |
1523 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1524 | ||
1525 | if (s->prepare) | |
1526 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1527 | ||
1528 | return 0; | |
1529 | } | |
1530 | ||
f7262a9f | 1531 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1532 | assert_return(s, -EINVAL); |
1533 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1534 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1535 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1536 | |
1537 | *usec = s->time.next; | |
1538 | return 0; | |
1539 | } | |
1540 | ||
f7262a9f | 1541 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1542 | struct clock_data *d; |
1543 | ||
305f78bf LP |
1544 | assert_return(s, -EINVAL); |
1545 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1546 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1547 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1548 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1549 | |
fd38203a | 1550 | s->time.next = usec; |
2576a19e | 1551 | |
0cc1125a | 1552 | source_set_pending(s, false); |
fd38203a | 1553 | |
6a0f1f6d LP |
1554 | d = event_get_clock_data(s->event, s->type); |
1555 | assert(d); | |
1556 | ||
1557 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1558 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1559 | d->needs_rearm = true; |
fd38203a LP |
1560 | |
1561 | return 0; | |
1562 | } | |
1563 | ||
f7262a9f | 1564 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1565 | assert_return(s, -EINVAL); |
1566 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1567 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1568 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1569 | ||
1570 | *usec = s->time.accuracy; | |
1571 | return 0; | |
1572 | } | |
1573 | ||
f7262a9f | 1574 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1575 | struct clock_data *d; |
1576 | ||
305f78bf LP |
1577 | assert_return(s, -EINVAL); |
1578 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1579 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1580 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1581 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1582 | |
1583 | if (usec == 0) | |
1584 | usec = DEFAULT_ACCURACY_USEC; | |
1585 | ||
eaa3cbef LP |
1586 | s->time.accuracy = usec; |
1587 | ||
2576a19e LP |
1588 | source_set_pending(s, false); |
1589 | ||
6a0f1f6d LP |
1590 | d = event_get_clock_data(s->event, s->type); |
1591 | assert(d); | |
1592 | ||
1593 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1594 | d->needs_rearm = true; |
6a0f1f6d LP |
1595 | |
1596 | return 0; | |
1597 | } | |
1598 | ||
1599 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1600 | assert_return(s, -EINVAL); | |
1601 | assert_return(clock, -EINVAL); | |
1602 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1603 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1604 | |
6a0f1f6d | 1605 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1606 | return 0; |
1607 | } | |
1608 | ||
f7262a9f | 1609 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1610 | assert_return(s, -EINVAL); |
1611 | assert_return(pid, -EINVAL); | |
1612 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1613 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1614 | ||
1615 | *pid = s->child.pid; | |
1616 | return 0; | |
1617 | } | |
1618 | ||
718db961 | 1619 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1620 | int r; |
1621 | ||
da7e457c | 1622 | assert_return(s, -EINVAL); |
6203e07a | 1623 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1624 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1625 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1626 | |
1627 | if (s->prepare == callback) | |
1628 | return 0; | |
1629 | ||
1630 | if (callback && s->prepare) { | |
1631 | s->prepare = callback; | |
1632 | return 0; | |
1633 | } | |
1634 | ||
1635 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1636 | if (r < 0) | |
1637 | return r; | |
1638 | ||
1639 | s->prepare = callback; | |
1640 | ||
1641 | if (callback) { | |
1642 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1643 | if (r < 0) | |
1644 | return r; | |
1645 | } else | |
1646 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1647 | ||
1648 | return 0; | |
1649 | } | |
1650 | ||
f7262a9f | 1651 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1652 | assert_return(s, NULL); |
fd38203a LP |
1653 | |
1654 | return s->userdata; | |
1655 | } | |
1656 | ||
8f726607 LP |
1657 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1658 | void *ret; | |
1659 | ||
1660 | assert_return(s, NULL); | |
1661 | ||
1662 | ret = s->userdata; | |
1663 | s->userdata = userdata; | |
1664 | ||
1665 | return ret; | |
1666 | } | |
1667 | ||
c2ba3ad6 LP |
1668 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1669 | usec_t c; | |
1670 | assert(e); | |
1671 | assert(a <= b); | |
1672 | ||
1673 | if (a <= 0) | |
1674 | return 0; | |
1675 | ||
1676 | if (b <= a + 1) | |
1677 | return a; | |
1678 | ||
52444dc4 LP |
1679 | initialize_perturb(e); |
1680 | ||
c2ba3ad6 LP |
1681 | /* |
1682 | Find a good time to wake up again between times a and b. We | |
1683 | have two goals here: | |
1684 | ||
1685 | a) We want to wake up as seldom as possible, hence prefer | |
1686 | later times over earlier times. | |
1687 | ||
1688 | b) But if we have to wake up, then let's make sure to | |
1689 | dispatch as much as possible on the entire system. | |
1690 | ||
1691 | We implement this by waking up everywhere at the same time | |
850516e0 | 1692 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1693 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1694 | then we try to find the same spot in every 10s, then 1s and |
1695 | then 250ms step. Otherwise, we pick the last possible time | |
1696 | to wake up. | |
c2ba3ad6 LP |
1697 | */ |
1698 | ||
850516e0 LP |
1699 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1700 | if (c >= b) { | |
1701 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1702 | return b; | |
1703 | ||
1704 | c -= USEC_PER_MINUTE; | |
1705 | } | |
1706 | ||
ba276c81 LP |
1707 | if (c >= a) |
1708 | return c; | |
1709 | ||
1710 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1711 | if (c >= b) { | |
1712 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1713 | return b; | |
1714 | ||
1715 | c -= USEC_PER_SEC*10; | |
1716 | } | |
1717 | ||
850516e0 LP |
1718 | if (c >= a) |
1719 | return c; | |
1720 | ||
1721 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1722 | if (c >= b) { |
1723 | if (_unlikely_(c < USEC_PER_SEC)) | |
1724 | return b; | |
1725 | ||
1726 | c -= USEC_PER_SEC; | |
1727 | } | |
1728 | ||
1729 | if (c >= a) | |
1730 | return c; | |
1731 | ||
1732 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1733 | if (c >= b) { | |
1734 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1735 | return b; | |
1736 | ||
1737 | c -= USEC_PER_MSEC*250; | |
1738 | } | |
1739 | ||
1740 | if (c >= a) | |
1741 | return c; | |
1742 | ||
1743 | return b; | |
1744 | } | |
1745 | ||
fd38203a LP |
1746 | static int event_arm_timer( |
1747 | sd_event *e, | |
6a0f1f6d | 1748 | struct clock_data *d) { |
fd38203a LP |
1749 | |
1750 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1751 | sd_event_source *a, *b; |
1752 | usec_t t; | |
fd38203a LP |
1753 | int r; |
1754 | ||
cde93897 | 1755 | assert(e); |
6a0f1f6d | 1756 | assert(d); |
fd38203a | 1757 | |
d06441da | 1758 | if (!d->needs_rearm) |
212bbb17 TG |
1759 | return 0; |
1760 | else | |
1761 | d->needs_rearm = false; | |
1762 | ||
6a0f1f6d | 1763 | a = prioq_peek(d->earliest); |
72aedc1e LP |
1764 | if (!a || a->enabled == SD_EVENT_OFF) { |
1765 | ||
6a0f1f6d | 1766 | if (d->fd < 0) |
c57b5ca3 LP |
1767 | return 0; |
1768 | ||
3a43da28 | 1769 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
1770 | return 0; |
1771 | ||
1772 | /* disarm */ | |
6a0f1f6d | 1773 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1774 | if (r < 0) |
1775 | return r; | |
1776 | ||
3a43da28 | 1777 | d->next = USEC_INFINITY; |
fd38203a | 1778 | return 0; |
72aedc1e | 1779 | } |
fd38203a | 1780 | |
6a0f1f6d | 1781 | b = prioq_peek(d->latest); |
baf76283 | 1782 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1783 | |
1784 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
6a0f1f6d | 1785 | if (d->next == t) |
fd38203a LP |
1786 | return 0; |
1787 | ||
6a0f1f6d | 1788 | assert_se(d->fd >= 0); |
fd38203a | 1789 | |
c2ba3ad6 | 1790 | if (t == 0) { |
fd38203a LP |
1791 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1792 | its.it_value.tv_sec = 0; | |
1793 | its.it_value.tv_nsec = 1; | |
1794 | } else | |
c2ba3ad6 | 1795 | timespec_store(&its.it_value, t); |
fd38203a | 1796 | |
6a0f1f6d | 1797 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 1798 | if (r < 0) |
cde93897 | 1799 | return -errno; |
fd38203a | 1800 | |
6a0f1f6d | 1801 | d->next = t; |
fd38203a LP |
1802 | return 0; |
1803 | } | |
1804 | ||
9a800b56 | 1805 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
1806 | assert(e); |
1807 | assert(s); | |
1808 | assert(s->type == SOURCE_IO); | |
1809 | ||
9a800b56 LP |
1810 | /* If the event source was already pending, we just OR in the |
1811 | * new revents, otherwise we reset the value. The ORing is | |
1812 | * necessary to handle EPOLLONESHOT events properly where | |
1813 | * readability might happen independently of writability, and | |
1814 | * we need to keep track of both */ | |
1815 | ||
1816 | if (s->pending) | |
1817 | s->io.revents |= revents; | |
1818 | else | |
1819 | s->io.revents = revents; | |
fd38203a | 1820 | |
fd38203a LP |
1821 | return source_set_pending(s, true); |
1822 | } | |
1823 | ||
72aedc1e | 1824 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
1825 | uint64_t x; |
1826 | ssize_t ss; | |
1827 | ||
1828 | assert(e); | |
da7e457c | 1829 | assert(fd >= 0); |
72aedc1e | 1830 | |
305f78bf | 1831 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1832 | |
1833 | ss = read(fd, &x, sizeof(x)); | |
1834 | if (ss < 0) { | |
1835 | if (errno == EAGAIN || errno == EINTR) | |
1836 | return 0; | |
1837 | ||
1838 | return -errno; | |
1839 | } | |
1840 | ||
8d35dae7 | 1841 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
1842 | return -EIO; |
1843 | ||
cde93897 | 1844 | if (next) |
3a43da28 | 1845 | *next = USEC_INFINITY; |
72aedc1e | 1846 | |
fd38203a LP |
1847 | return 0; |
1848 | } | |
1849 | ||
305f78bf LP |
1850 | static int process_timer( |
1851 | sd_event *e, | |
1852 | usec_t n, | |
6a0f1f6d | 1853 | struct clock_data *d) { |
305f78bf | 1854 | |
fd38203a LP |
1855 | sd_event_source *s; |
1856 | int r; | |
1857 | ||
1858 | assert(e); | |
6a0f1f6d | 1859 | assert(d); |
fd38203a LP |
1860 | |
1861 | for (;;) { | |
6a0f1f6d | 1862 | s = prioq_peek(d->earliest); |
fd38203a LP |
1863 | if (!s || |
1864 | s->time.next > n || | |
baf76283 | 1865 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
1866 | s->pending) |
1867 | break; | |
1868 | ||
1869 | r = source_set_pending(s, true); | |
1870 | if (r < 0) | |
1871 | return r; | |
1872 | ||
6a0f1f6d LP |
1873 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
1874 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 1875 | d->needs_rearm = true; |
fd38203a LP |
1876 | } |
1877 | ||
1878 | return 0; | |
1879 | } | |
1880 | ||
1881 | static int process_child(sd_event *e) { | |
1882 | sd_event_source *s; | |
1883 | Iterator i; | |
1884 | int r; | |
1885 | ||
1886 | assert(e); | |
1887 | ||
c2ba3ad6 LP |
1888 | e->need_process_child = false; |
1889 | ||
fd38203a LP |
1890 | /* |
1891 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
1892 | + WNOHANG for each PID we wait for, instead of using | |
1893 | P_ALL. This is because we only want to get child | |
1894 | information of very specific child processes, and not all | |
1895 | of them. We might not have processed the SIGCHLD even of a | |
1896 | previous invocation and we don't want to maintain a | |
1897 | unbounded *per-child* event queue, hence we really don't | |
1898 | want anything flushed out of the kernel's queue that we | |
1899 | don't care about. Since this is O(n) this means that if you | |
1900 | have a lot of processes you probably want to handle SIGCHLD | |
1901 | yourself. | |
08cd1552 LP |
1902 | |
1903 | We do not reap the children here (by using WNOWAIT), this | |
1904 | is only done after the event source is dispatched so that | |
1905 | the callback still sees the process as a zombie. | |
fd38203a LP |
1906 | */ |
1907 | ||
1908 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
1909 | assert(s->type == SOURCE_CHILD); | |
1910 | ||
1911 | if (s->pending) | |
1912 | continue; | |
1913 | ||
baf76283 | 1914 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
1915 | continue; |
1916 | ||
1917 | zero(s->child.siginfo); | |
08cd1552 LP |
1918 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
1919 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
1920 | if (r < 0) |
1921 | return -errno; | |
1922 | ||
1923 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
1924 | bool zombie = |
1925 | s->child.siginfo.si_code == CLD_EXITED || | |
1926 | s->child.siginfo.si_code == CLD_KILLED || | |
1927 | s->child.siginfo.si_code == CLD_DUMPED; | |
1928 | ||
1929 | if (!zombie && (s->child.options & WEXITED)) { | |
1930 | /* If the child isn't dead then let's | |
1931 | * immediately remove the state change | |
1932 | * from the queue, since there's no | |
1933 | * benefit in leaving it queued */ | |
1934 | ||
1935 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
1936 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
1937 | } | |
1938 | ||
fd38203a LP |
1939 | r = source_set_pending(s, true); |
1940 | if (r < 0) | |
1941 | return r; | |
1942 | } | |
1943 | } | |
1944 | ||
fd38203a LP |
1945 | return 0; |
1946 | } | |
1947 | ||
1948 | static int process_signal(sd_event *e, uint32_t events) { | |
fd38203a | 1949 | bool read_one = false; |
fd38203a LP |
1950 | int r; |
1951 | ||
da7e457c | 1952 | assert(e); |
0eb2e0e3 | 1953 | |
305f78bf | 1954 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
1955 | |
1956 | for (;;) { | |
0eb2e0e3 ZJS |
1957 | struct signalfd_siginfo si; |
1958 | ssize_t ss; | |
92daebc0 | 1959 | sd_event_source *s = NULL; |
fd38203a LP |
1960 | |
1961 | ss = read(e->signal_fd, &si, sizeof(si)); | |
1962 | if (ss < 0) { | |
1963 | if (errno == EAGAIN || errno == EINTR) | |
1964 | return read_one; | |
1965 | ||
1966 | return -errno; | |
1967 | } | |
1968 | ||
8d35dae7 | 1969 | if (_unlikely_(ss != sizeof(si))) |
fd38203a LP |
1970 | return -EIO; |
1971 | ||
1972 | read_one = true; | |
1973 | ||
1974 | if (si.ssi_signo == SIGCHLD) { | |
1975 | r = process_child(e); | |
1976 | if (r < 0) | |
1977 | return r; | |
92daebc0 | 1978 | if (r > 0) |
fd38203a | 1979 | continue; |
92daebc0 LP |
1980 | } |
1981 | ||
1982 | if (e->signal_sources) | |
1983 | s = e->signal_sources[si.ssi_signo]; | |
1984 | ||
1985 | if (!s) | |
1986 | continue; | |
fd38203a LP |
1987 | |
1988 | s->signal.siginfo = si; | |
1989 | r = source_set_pending(s, true); | |
1990 | if (r < 0) | |
1991 | return r; | |
1992 | } | |
fd38203a LP |
1993 | } |
1994 | ||
1995 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 1996 | int r = 0; |
fd38203a LP |
1997 | |
1998 | assert(s); | |
6203e07a | 1999 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2000 | |
6203e07a | 2001 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
2002 | r = source_set_pending(s, false); |
2003 | if (r < 0) | |
2004 | return r; | |
2005 | } | |
fd38203a | 2006 | |
6e9feda3 LP |
2007 | if (s->type != SOURCE_POST) { |
2008 | sd_event_source *z; | |
2009 | Iterator i; | |
2010 | ||
2011 | /* If we execute a non-post source, let's mark all | |
2012 | * post sources as pending */ | |
2013 | ||
2014 | SET_FOREACH(z, s->event->post_sources, i) { | |
2015 | if (z->enabled == SD_EVENT_OFF) | |
2016 | continue; | |
2017 | ||
2018 | r = source_set_pending(z, true); | |
2019 | if (r < 0) | |
2020 | return r; | |
2021 | } | |
2022 | } | |
2023 | ||
baf76283 LP |
2024 | if (s->enabled == SD_EVENT_ONESHOT) { |
2025 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2026 | if (r < 0) |
2027 | return r; | |
2028 | } | |
2029 | ||
12179984 | 2030 | s->dispatching = true; |
b7484e2a | 2031 | |
fd38203a LP |
2032 | switch (s->type) { |
2033 | ||
2034 | case SOURCE_IO: | |
2035 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2036 | break; | |
2037 | ||
6a0f1f6d | 2038 | case SOURCE_TIME_REALTIME: |
a8548816 | 2039 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2040 | case SOURCE_TIME_MONOTONIC: |
2041 | case SOURCE_TIME_REALTIME_ALARM: | |
2042 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2043 | r = s->time.callback(s, s->time.next, s->userdata); |
2044 | break; | |
2045 | ||
2046 | case SOURCE_SIGNAL: | |
2047 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2048 | break; | |
2049 | ||
08cd1552 LP |
2050 | case SOURCE_CHILD: { |
2051 | bool zombie; | |
2052 | ||
2053 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
2054 | s->child.siginfo.si_code == CLD_KILLED || | |
2055 | s->child.siginfo.si_code == CLD_DUMPED; | |
2056 | ||
fd38203a | 2057 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2058 | |
2059 | /* Now, reap the PID for good. */ | |
2060 | if (zombie) | |
2061 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2062 | ||
fd38203a | 2063 | break; |
08cd1552 | 2064 | } |
fd38203a LP |
2065 | |
2066 | case SOURCE_DEFER: | |
2067 | r = s->defer.callback(s, s->userdata); | |
2068 | break; | |
da7e457c | 2069 | |
6e9feda3 LP |
2070 | case SOURCE_POST: |
2071 | r = s->post.callback(s, s->userdata); | |
2072 | break; | |
2073 | ||
6203e07a LP |
2074 | case SOURCE_EXIT: |
2075 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2076 | break; |
9d3e3aa5 LP |
2077 | |
2078 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2079 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2080 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2081 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2082 | } |
2083 | ||
12179984 LP |
2084 | s->dispatching = false; |
2085 | ||
2086 | if (r < 0) | |
6203e07a | 2087 | log_debug("Event source %p returned error, disabling: %s", s, strerror(-r)); |
12179984 LP |
2088 | |
2089 | if (s->n_ref == 0) | |
2090 | source_free(s); | |
2091 | else if (r < 0) | |
6203e07a | 2092 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2093 | |
6203e07a | 2094 | return 1; |
fd38203a LP |
2095 | } |
2096 | ||
2097 | static int event_prepare(sd_event *e) { | |
2098 | int r; | |
2099 | ||
2100 | assert(e); | |
2101 | ||
2102 | for (;;) { | |
2103 | sd_event_source *s; | |
2104 | ||
2105 | s = prioq_peek(e->prepare); | |
baf76283 | 2106 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2107 | break; |
2108 | ||
2109 | s->prepare_iteration = e->iteration; | |
2110 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2111 | if (r < 0) | |
2112 | return r; | |
2113 | ||
2114 | assert(s->prepare); | |
12179984 LP |
2115 | |
2116 | s->dispatching = true; | |
fd38203a | 2117 | r = s->prepare(s, s->userdata); |
12179984 LP |
2118 | s->dispatching = false; |
2119 | ||
fd38203a | 2120 | if (r < 0) |
12179984 | 2121 | log_debug("Prepare callback of event source %p returned error, disabling: %s", s, strerror(-r)); |
fd38203a | 2122 | |
12179984 LP |
2123 | if (s->n_ref == 0) |
2124 | source_free(s); | |
2125 | else if (r < 0) | |
2126 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2127 | } |
2128 | ||
2129 | return 0; | |
2130 | } | |
2131 | ||
6203e07a | 2132 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2133 | sd_event_source *p; |
2134 | int r; | |
2135 | ||
2136 | assert(e); | |
2137 | ||
6203e07a | 2138 | p = prioq_peek(e->exit); |
baf76283 | 2139 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2140 | e->state = SD_EVENT_FINISHED; |
2141 | return 0; | |
2142 | } | |
2143 | ||
2144 | sd_event_ref(e); | |
2145 | e->iteration++; | |
6203e07a | 2146 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2147 | |
2148 | r = source_dispatch(p); | |
2149 | ||
2150 | e->state = SD_EVENT_PASSIVE; | |
2151 | sd_event_unref(e); | |
2152 | ||
2153 | return r; | |
2154 | } | |
2155 | ||
c2ba3ad6 LP |
2156 | static sd_event_source* event_next_pending(sd_event *e) { |
2157 | sd_event_source *p; | |
2158 | ||
da7e457c LP |
2159 | assert(e); |
2160 | ||
c2ba3ad6 LP |
2161 | p = prioq_peek(e->pending); |
2162 | if (!p) | |
2163 | return NULL; | |
2164 | ||
baf76283 | 2165 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2166 | return NULL; |
2167 | ||
2168 | return p; | |
2169 | } | |
2170 | ||
cde93897 LP |
2171 | static int arm_watchdog(sd_event *e) { |
2172 | struct itimerspec its = {}; | |
2173 | usec_t t; | |
2174 | int r; | |
2175 | ||
2176 | assert(e); | |
2177 | assert(e->watchdog_fd >= 0); | |
2178 | ||
2179 | t = sleep_between(e, | |
2180 | e->watchdog_last + (e->watchdog_period / 2), | |
2181 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2182 | ||
2183 | timespec_store(&its.it_value, t); | |
2184 | ||
75145780 LP |
2185 | /* Make sure we never set the watchdog to 0, which tells the |
2186 | * kernel to disable it. */ | |
2187 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2188 | its.it_value.tv_nsec = 1; | |
2189 | ||
cde93897 LP |
2190 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2191 | if (r < 0) | |
2192 | return -errno; | |
2193 | ||
2194 | return 0; | |
2195 | } | |
2196 | ||
2197 | static int process_watchdog(sd_event *e) { | |
2198 | assert(e); | |
2199 | ||
2200 | if (!e->watchdog) | |
2201 | return 0; | |
2202 | ||
2203 | /* Don't notify watchdog too often */ | |
2204 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2205 | return 0; | |
2206 | ||
2207 | sd_notify(false, "WATCHDOG=1"); | |
2208 | e->watchdog_last = e->timestamp.monotonic; | |
2209 | ||
2210 | return arm_watchdog(e); | |
2211 | } | |
2212 | ||
f7262a9f | 2213 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
15b38f93 LP |
2214 | struct epoll_event *ev_queue; |
2215 | unsigned ev_queue_max; | |
fd38203a | 2216 | sd_event_source *p; |
305f78bf | 2217 | int r, i, m; |
eec6022c | 2218 | bool timedout; |
fd38203a | 2219 | |
da7e457c LP |
2220 | assert_return(e, -EINVAL); |
2221 | assert_return(!event_pid_changed(e), -ECHILD); | |
2222 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2223 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2224 | ||
6203e07a LP |
2225 | if (e->exit_requested) |
2226 | return dispatch_exit(e); | |
fd38203a | 2227 | |
da7e457c | 2228 | sd_event_ref(e); |
fd38203a | 2229 | e->iteration++; |
da7e457c | 2230 | e->state = SD_EVENT_RUNNING; |
fd38203a LP |
2231 | |
2232 | r = event_prepare(e); | |
2233 | if (r < 0) | |
da7e457c | 2234 | goto finish; |
fd38203a | 2235 | |
6a0f1f6d LP |
2236 | r = event_arm_timer(e, &e->realtime); |
2237 | if (r < 0) | |
2238 | goto finish; | |
2239 | ||
a8548816 TG |
2240 | r = event_arm_timer(e, &e->boottime); |
2241 | if (r < 0) | |
2242 | goto finish; | |
2243 | ||
6a0f1f6d LP |
2244 | r = event_arm_timer(e, &e->monotonic); |
2245 | if (r < 0) | |
2246 | goto finish; | |
2247 | ||
2248 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 LP |
2249 | if (r < 0) |
2250 | goto finish; | |
fd38203a | 2251 | |
6a0f1f6d | 2252 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 LP |
2253 | if (r < 0) |
2254 | goto finish; | |
fd38203a | 2255 | |
1b5995b0 LP |
2256 | if (event_next_pending(e) || e->need_process_child) |
2257 | timeout = 0; | |
6a0f1f6d | 2258 | |
15b38f93 LP |
2259 | ev_queue_max = CLAMP(e->n_sources, 1U, EPOLL_QUEUE_MAX); |
2260 | ev_queue = newa(struct epoll_event, ev_queue_max); | |
fd38203a | 2261 | |
15b38f93 | 2262 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2263 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2264 | if (m < 0) { |
ff003106 | 2265 | r = errno == EAGAIN || errno == EINTR ? 1 : -errno; |
da7e457c LP |
2266 | goto finish; |
2267 | } | |
fd38203a | 2268 | |
eec6022c LP |
2269 | timedout = m == 0; |
2270 | ||
46e8c825 | 2271 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2272 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2273 | |
2274 | for (i = 0; i < m; i++) { | |
2275 | ||
6a0f1f6d LP |
2276 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME)) |
2277 | r = flush_timer(e, e->realtime.fd, ev_queue[i].events, &e->realtime.next); | |
a8548816 TG |
2278 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_BOOTTIME)) |
2279 | r = flush_timer(e, e->boottime.fd, ev_queue[i].events, &e->boottime.next); | |
6a0f1f6d LP |
2280 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_MONOTONIC)) |
2281 | r = flush_timer(e, e->monotonic.fd, ev_queue[i].events, &e->monotonic.next); | |
2282 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_REALTIME_ALARM)) | |
2283 | r = flush_timer(e, e->realtime_alarm.fd, ev_queue[i].events, &e->realtime_alarm.next); | |
2284 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_TIME_BOOTTIME_ALARM)) | |
2285 | r = flush_timer(e, e->boottime_alarm.fd, ev_queue[i].events, &e->boottime_alarm.next); | |
fd38203a LP |
2286 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_SIGNAL)) |
2287 | r = process_signal(e, ev_queue[i].events); | |
79e16ce3 | 2288 | else if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2289 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
fd38203a LP |
2290 | else |
2291 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2292 | ||
2293 | if (r < 0) | |
da7e457c | 2294 | goto finish; |
fd38203a LP |
2295 | } |
2296 | ||
cde93897 LP |
2297 | r = process_watchdog(e); |
2298 | if (r < 0) | |
2299 | goto finish; | |
2300 | ||
6a0f1f6d LP |
2301 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2302 | if (r < 0) | |
2303 | goto finish; | |
2304 | ||
a8548816 TG |
2305 | r = process_timer(e, e->timestamp_boottime, &e->boottime); |
2306 | if (r < 0) | |
2307 | goto finish; | |
2308 | ||
6a0f1f6d LP |
2309 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2310 | if (r < 0) | |
2311 | goto finish; | |
2312 | ||
2313 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2314 | if (r < 0) |
da7e457c | 2315 | goto finish; |
fd38203a | 2316 | |
6a0f1f6d | 2317 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2318 | if (r < 0) |
da7e457c | 2319 | goto finish; |
fd38203a | 2320 | |
c2ba3ad6 | 2321 | if (e->need_process_child) { |
fd38203a LP |
2322 | r = process_child(e); |
2323 | if (r < 0) | |
da7e457c | 2324 | goto finish; |
fd38203a LP |
2325 | } |
2326 | ||
c2ba3ad6 | 2327 | p = event_next_pending(e); |
da7e457c | 2328 | if (!p) { |
eec6022c | 2329 | r = !timedout; |
da7e457c LP |
2330 | goto finish; |
2331 | } | |
2332 | ||
2333 | r = source_dispatch(p); | |
fd38203a | 2334 | |
da7e457c LP |
2335 | finish: |
2336 | e->state = SD_EVENT_PASSIVE; | |
2337 | sd_event_unref(e); | |
2338 | ||
2339 | return r; | |
fd38203a LP |
2340 | } |
2341 | ||
f7262a9f | 2342 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2343 | int r; |
2344 | ||
da7e457c LP |
2345 | assert_return(e, -EINVAL); |
2346 | assert_return(!event_pid_changed(e), -ECHILD); | |
2347 | assert_return(e->state == SD_EVENT_PASSIVE, -EBUSY); | |
2348 | ||
2349 | sd_event_ref(e); | |
fd38203a | 2350 | |
da7e457c | 2351 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2352 | r = sd_event_run(e, (uint64_t) -1); |
2353 | if (r < 0) | |
da7e457c | 2354 | goto finish; |
fd38203a LP |
2355 | } |
2356 | ||
6203e07a | 2357 | r = e->exit_code; |
da7e457c LP |
2358 | |
2359 | finish: | |
2360 | sd_event_unref(e); | |
2361 | return r; | |
fd38203a LP |
2362 | } |
2363 | ||
f7262a9f | 2364 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2365 | assert_return(e, -EINVAL); |
2366 | assert_return(!event_pid_changed(e), -ECHILD); | |
2367 | ||
2368 | return e->state; | |
2369 | } | |
2370 | ||
6203e07a | 2371 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2372 | assert_return(e, -EINVAL); |
6203e07a | 2373 | assert_return(code, -EINVAL); |
da7e457c | 2374 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2375 | |
6203e07a LP |
2376 | if (!e->exit_requested) |
2377 | return -ENODATA; | |
2378 | ||
2379 | *code = e->exit_code; | |
2380 | return 0; | |
fd38203a LP |
2381 | } |
2382 | ||
6203e07a | 2383 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2384 | assert_return(e, -EINVAL); |
2385 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2386 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2387 | |
6203e07a LP |
2388 | e->exit_requested = true; |
2389 | e->exit_code = code; | |
2390 | ||
fd38203a LP |
2391 | return 0; |
2392 | } | |
46e8c825 | 2393 | |
6a0f1f6d | 2394 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2395 | assert_return(e, -EINVAL); |
2396 | assert_return(usec, -EINVAL); | |
46e8c825 LP |
2397 | assert_return(!event_pid_changed(e), -ECHILD); |
2398 | ||
6a0f1f6d LP |
2399 | /* If we haven't run yet, just get the actual time */ |
2400 | if (!dual_timestamp_is_set(&e->timestamp)) | |
2401 | return -ENODATA; | |
46e8c825 | 2402 | |
6a0f1f6d LP |
2403 | switch (clock) { |
2404 | ||
2405 | case CLOCK_REALTIME: | |
2406 | case CLOCK_REALTIME_ALARM: | |
2407 | *usec = e->timestamp.realtime; | |
2408 | break; | |
2409 | ||
2410 | case CLOCK_MONOTONIC: | |
2411 | *usec = e->timestamp.monotonic; | |
2412 | break; | |
2413 | ||
a8548816 | 2414 | case CLOCK_BOOTTIME: |
6a0f1f6d LP |
2415 | case CLOCK_BOOTTIME_ALARM: |
2416 | *usec = e->timestamp_boottime; | |
2417 | break; | |
2418 | } | |
46e8c825 | 2419 | |
46e8c825 LP |
2420 | return 0; |
2421 | } | |
afc6adb5 LP |
2422 | |
2423 | _public_ int sd_event_default(sd_event **ret) { | |
2424 | ||
ec202eae | 2425 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2426 | sd_event *e = NULL; |
afc6adb5 LP |
2427 | int r; |
2428 | ||
2429 | if (!ret) | |
2430 | return !!default_event; | |
2431 | ||
2432 | if (default_event) { | |
2433 | *ret = sd_event_ref(default_event); | |
2434 | return 0; | |
2435 | } | |
2436 | ||
2437 | r = sd_event_new(&e); | |
2438 | if (r < 0) | |
2439 | return r; | |
2440 | ||
2441 | e->default_event_ptr = &default_event; | |
2442 | e->tid = gettid(); | |
2443 | default_event = e; | |
2444 | ||
2445 | *ret = e; | |
2446 | return 1; | |
2447 | } | |
2448 | ||
2449 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2450 | assert_return(e, -EINVAL); | |
2451 | assert_return(tid, -EINVAL); | |
76b54375 | 2452 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2453 | |
76b54375 LP |
2454 | if (e->tid != 0) { |
2455 | *tid = e->tid; | |
2456 | return 0; | |
2457 | } | |
2458 | ||
2459 | return -ENXIO; | |
afc6adb5 | 2460 | } |
cde93897 LP |
2461 | |
2462 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2463 | int r; | |
2464 | ||
2465 | assert_return(e, -EINVAL); | |
8f726607 | 2466 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2467 | |
2468 | if (e->watchdog == !!b) | |
2469 | return e->watchdog; | |
2470 | ||
2471 | if (b) { | |
2472 | struct epoll_event ev = {}; | |
cde93897 | 2473 | |
09812eb7 LP |
2474 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2475 | if (r <= 0) | |
cde93897 | 2476 | return r; |
cde93897 LP |
2477 | |
2478 | /* Issue first ping immediately */ | |
2479 | sd_notify(false, "WATCHDOG=1"); | |
2480 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2481 | ||
2482 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2483 | if (e->watchdog_fd < 0) | |
2484 | return -errno; | |
2485 | ||
2486 | r = arm_watchdog(e); | |
2487 | if (r < 0) | |
2488 | goto fail; | |
2489 | ||
2490 | ev.events = EPOLLIN; | |
2491 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2492 | ||
2493 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2494 | if (r < 0) { | |
2495 | r = -errno; | |
2496 | goto fail; | |
2497 | } | |
2498 | ||
2499 | } else { | |
2500 | if (e->watchdog_fd >= 0) { | |
2501 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2502 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2503 | } |
2504 | } | |
2505 | ||
2506 | e->watchdog = !!b; | |
2507 | return e->watchdog; | |
2508 | ||
2509 | fail: | |
03e334a1 | 2510 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2511 | return r; |
2512 | } | |
8f726607 LP |
2513 | |
2514 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2515 | assert_return(e, -EINVAL); | |
2516 | assert_return(!event_pid_changed(e), -ECHILD); | |
2517 | ||
2518 | return e->watchdog; | |
2519 | } |