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fd38203a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/epoll.h> | |
23 | #include <sys/timerfd.h> | |
24 | #include <sys/wait.h> | |
25 | ||
afc6adb5 | 26 | #include "sd-id128.h" |
cde93897 | 27 | #include "sd-daemon.h" |
fd38203a | 28 | #include "macro.h" |
fd38203a LP |
29 | #include "prioq.h" |
30 | #include "hashmap.h" | |
31 | #include "util.h" | |
32 | #include "time-util.h" | |
afc6adb5 | 33 | #include "missing.h" |
6e9feda3 | 34 | #include "set.h" |
a71fe8b8 | 35 | #include "list.h" |
24882e06 | 36 | #include "signal-util.h" |
fd38203a LP |
37 | |
38 | #include "sd-event.h" | |
39 | ||
c2ba3ad6 | 40 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
41 | |
42 | typedef enum EventSourceType { | |
43 | SOURCE_IO, | |
6a0f1f6d | 44 | SOURCE_TIME_REALTIME, |
a8548816 | 45 | SOURCE_TIME_BOOTTIME, |
6a0f1f6d LP |
46 | SOURCE_TIME_MONOTONIC, |
47 | SOURCE_TIME_REALTIME_ALARM, | |
48 | SOURCE_TIME_BOOTTIME_ALARM, | |
fd38203a LP |
49 | SOURCE_SIGNAL, |
50 | SOURCE_CHILD, | |
da7e457c | 51 | SOURCE_DEFER, |
6e9feda3 | 52 | SOURCE_POST, |
6203e07a | 53 | SOURCE_EXIT, |
6a0f1f6d | 54 | SOURCE_WATCHDOG, |
a71fe8b8 | 55 | _SOURCE_EVENT_SOURCE_TYPE_MAX, |
6a0f1f6d | 56 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 |
fd38203a LP |
57 | } EventSourceType; |
58 | ||
9da4cb2b LP |
59 | /* All objects we use in epoll events start with this value, so that |
60 | * we know how to dispatch it */ | |
61 | typedef enum WakeupType { | |
62 | WAKEUP_NONE, | |
63 | WAKEUP_EVENT_SOURCE, | |
64 | WAKEUP_CLOCK_DATA, | |
65 | WAKEUP_SIGNAL_DATA, | |
66 | _WAKEUP_TYPE_MAX, | |
67 | _WAKEUP_TYPE_INVALID = -1, | |
68 | } WakeupType; | |
69 | ||
a8548816 | 70 | #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 | 71 | |
fd38203a | 72 | struct sd_event_source { |
9da4cb2b LP |
73 | WakeupType wakeup; |
74 | ||
da7e457c | 75 | unsigned n_ref; |
fd38203a LP |
76 | |
77 | sd_event *event; | |
78 | void *userdata; | |
718db961 | 79 | sd_event_handler_t prepare; |
fd38203a | 80 | |
356779df | 81 | char *description; |
f7f53e9e | 82 | |
6a0f1f6d | 83 | EventSourceType type:5; |
baf76283 | 84 | int enabled:3; |
fd38203a | 85 | bool pending:1; |
12179984 | 86 | bool dispatching:1; |
a71fe8b8 | 87 | bool floating:1; |
fd38203a | 88 | |
31927c16 | 89 | int64_t priority; |
fd38203a LP |
90 | unsigned pending_index; |
91 | unsigned prepare_index; | |
92 | unsigned pending_iteration; | |
93 | unsigned prepare_iteration; | |
94 | ||
a71fe8b8 LP |
95 | LIST_FIELDS(sd_event_source, sources); |
96 | ||
fd38203a LP |
97 | union { |
98 | struct { | |
718db961 | 99 | sd_event_io_handler_t callback; |
fd38203a LP |
100 | int fd; |
101 | uint32_t events; | |
102 | uint32_t revents; | |
103 | bool registered:1; | |
104 | } io; | |
105 | struct { | |
718db961 | 106 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
107 | usec_t next, accuracy; |
108 | unsigned earliest_index; | |
109 | unsigned latest_index; | |
fd38203a LP |
110 | } time; |
111 | struct { | |
718db961 | 112 | sd_event_signal_handler_t callback; |
fd38203a LP |
113 | struct signalfd_siginfo siginfo; |
114 | int sig; | |
115 | } signal; | |
116 | struct { | |
718db961 | 117 | sd_event_child_handler_t callback; |
fd38203a LP |
118 | siginfo_t siginfo; |
119 | pid_t pid; | |
120 | int options; | |
121 | } child; | |
122 | struct { | |
718db961 | 123 | sd_event_handler_t callback; |
fd38203a | 124 | } defer; |
6e9feda3 LP |
125 | struct { |
126 | sd_event_handler_t callback; | |
127 | } post; | |
da7e457c | 128 | struct { |
718db961 | 129 | sd_event_handler_t callback; |
da7e457c | 130 | unsigned prioq_index; |
6203e07a | 131 | } exit; |
fd38203a LP |
132 | }; |
133 | }; | |
134 | ||
6a0f1f6d | 135 | struct clock_data { |
9da4cb2b | 136 | WakeupType wakeup; |
6a0f1f6d LP |
137 | int fd; |
138 | ||
139 | /* For all clocks we maintain two priority queues each, one | |
140 | * ordered for the earliest times the events may be | |
141 | * dispatched, and one ordered by the latest times they must | |
142 | * have been dispatched. The range between the top entries in | |
143 | * the two prioqs is the time window we can freely schedule | |
144 | * wakeups in */ | |
145 | ||
146 | Prioq *earliest; | |
147 | Prioq *latest; | |
148 | usec_t next; | |
212bbb17 TG |
149 | |
150 | bool needs_rearm:1; | |
6a0f1f6d LP |
151 | }; |
152 | ||
9da4cb2b LP |
153 | struct signal_data { |
154 | WakeupType wakeup; | |
155 | ||
156 | /* For each priority we maintain one signal fd, so that we | |
157 | * only have to dequeue a single event per priority at a | |
158 | * time. */ | |
159 | ||
160 | int fd; | |
161 | int64_t priority; | |
162 | sigset_t sigset; | |
163 | sd_event_source *current; | |
164 | }; | |
165 | ||
fd38203a | 166 | struct sd_event { |
da7e457c | 167 | unsigned n_ref; |
fd38203a LP |
168 | |
169 | int epoll_fd; | |
cde93897 | 170 | int watchdog_fd; |
fd38203a LP |
171 | |
172 | Prioq *pending; | |
173 | Prioq *prepare; | |
c2ba3ad6 | 174 | |
a8548816 | 175 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
176 | * can add support for more clocks when the kernel learns to |
177 | * deal with them, too. */ | |
178 | struct clock_data realtime; | |
a8548816 | 179 | struct clock_data boottime; |
6a0f1f6d LP |
180 | struct clock_data monotonic; |
181 | struct clock_data realtime_alarm; | |
182 | struct clock_data boottime_alarm; | |
fd38203a | 183 | |
da7e457c LP |
184 | usec_t perturb; |
185 | ||
9da4cb2b LP |
186 | sd_event_source **signal_sources; /* indexed by signal number */ |
187 | Hashmap *signal_data; /* indexed by priority */ | |
fd38203a LP |
188 | |
189 | Hashmap *child_sources; | |
baf76283 | 190 | unsigned n_enabled_child_sources; |
fd38203a | 191 | |
6e9feda3 LP |
192 | Set *post_sources; |
193 | ||
6203e07a | 194 | Prioq *exit; |
fd38203a | 195 | |
da7e457c | 196 | pid_t original_pid; |
c2ba3ad6 | 197 | |
da7e457c | 198 | unsigned iteration; |
46e8c825 | 199 | dual_timestamp timestamp; |
6a0f1f6d | 200 | usec_t timestamp_boottime; |
da7e457c | 201 | int state; |
eaa3cbef | 202 | |
6203e07a | 203 | bool exit_requested:1; |
da7e457c | 204 | bool need_process_child:1; |
cde93897 | 205 | bool watchdog:1; |
afc6adb5 | 206 | |
6203e07a LP |
207 | int exit_code; |
208 | ||
afc6adb5 LP |
209 | pid_t tid; |
210 | sd_event **default_event_ptr; | |
cde93897 LP |
211 | |
212 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
213 | |
214 | unsigned n_sources; | |
a71fe8b8 LP |
215 | |
216 | LIST_HEAD(sd_event_source, sources); | |
fd38203a LP |
217 | }; |
218 | ||
a71fe8b8 LP |
219 | static void source_disconnect(sd_event_source *s); |
220 | ||
fd38203a LP |
221 | static int pending_prioq_compare(const void *a, const void *b) { |
222 | const sd_event_source *x = a, *y = b; | |
223 | ||
224 | assert(x->pending); | |
225 | assert(y->pending); | |
226 | ||
baf76283 LP |
227 | /* Enabled ones first */ |
228 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 229 | return -1; |
baf76283 | 230 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
231 | return 1; |
232 | ||
233 | /* Lower priority values first */ | |
234 | if (x->priority < y->priority) | |
235 | return -1; | |
236 | if (x->priority > y->priority) | |
237 | return 1; | |
238 | ||
239 | /* Older entries first */ | |
240 | if (x->pending_iteration < y->pending_iteration) | |
241 | return -1; | |
242 | if (x->pending_iteration > y->pending_iteration) | |
243 | return 1; | |
244 | ||
fd38203a LP |
245 | return 0; |
246 | } | |
247 | ||
248 | static int prepare_prioq_compare(const void *a, const void *b) { | |
249 | const sd_event_source *x = a, *y = b; | |
250 | ||
251 | assert(x->prepare); | |
252 | assert(y->prepare); | |
253 | ||
8046c457 KK |
254 | /* Enabled ones first */ |
255 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
256 | return -1; | |
257 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
258 | return 1; | |
259 | ||
fd38203a LP |
260 | /* Move most recently prepared ones last, so that we can stop |
261 | * preparing as soon as we hit one that has already been | |
262 | * prepared in the current iteration */ | |
263 | if (x->prepare_iteration < y->prepare_iteration) | |
264 | return -1; | |
265 | if (x->prepare_iteration > y->prepare_iteration) | |
266 | return 1; | |
267 | ||
fd38203a LP |
268 | /* Lower priority values first */ |
269 | if (x->priority < y->priority) | |
270 | return -1; | |
271 | if (x->priority > y->priority) | |
272 | return 1; | |
273 | ||
fd38203a LP |
274 | return 0; |
275 | } | |
276 | ||
c2ba3ad6 | 277 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
278 | const sd_event_source *x = a, *y = b; |
279 | ||
6a0f1f6d LP |
280 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
281 | assert(x->type == y->type); | |
fd38203a | 282 | |
baf76283 LP |
283 | /* Enabled ones first */ |
284 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 285 | return -1; |
baf76283 | 286 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
287 | return 1; |
288 | ||
289 | /* Move the pending ones to the end */ | |
290 | if (!x->pending && y->pending) | |
291 | return -1; | |
292 | if (x->pending && !y->pending) | |
293 | return 1; | |
294 | ||
295 | /* Order by time */ | |
296 | if (x->time.next < y->time.next) | |
297 | return -1; | |
298 | if (x->time.next > y->time.next) | |
a99badf5 | 299 | return 1; |
fd38203a | 300 | |
fd38203a LP |
301 | return 0; |
302 | } | |
303 | ||
c2ba3ad6 LP |
304 | static int latest_time_prioq_compare(const void *a, const void *b) { |
305 | const sd_event_source *x = a, *y = b; | |
306 | ||
6a0f1f6d LP |
307 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
308 | assert(x->type == y->type); | |
c2ba3ad6 | 309 | |
baf76283 LP |
310 | /* Enabled ones first */ |
311 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 312 | return -1; |
baf76283 | 313 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
314 | return 1; |
315 | ||
316 | /* Move the pending ones to the end */ | |
317 | if (!x->pending && y->pending) | |
318 | return -1; | |
319 | if (x->pending && !y->pending) | |
320 | return 1; | |
321 | ||
322 | /* Order by time */ | |
323 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
324 | return -1; | |
325 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
a99badf5 | 326 | return 1; |
c2ba3ad6 | 327 | |
c2ba3ad6 LP |
328 | return 0; |
329 | } | |
330 | ||
6203e07a | 331 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
332 | const sd_event_source *x = a, *y = b; |
333 | ||
6203e07a LP |
334 | assert(x->type == SOURCE_EXIT); |
335 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 336 | |
baf76283 LP |
337 | /* Enabled ones first */ |
338 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 339 | return -1; |
baf76283 | 340 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
341 | return 1; |
342 | ||
343 | /* Lower priority values first */ | |
344 | if (x->priority < y->priority) | |
345 | return -1; | |
346 | if (x->priority > y->priority) | |
347 | return 1; | |
348 | ||
da7e457c LP |
349 | return 0; |
350 | } | |
351 | ||
6a0f1f6d LP |
352 | static void free_clock_data(struct clock_data *d) { |
353 | assert(d); | |
9da4cb2b | 354 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
355 | |
356 | safe_close(d->fd); | |
357 | prioq_free(d->earliest); | |
358 | prioq_free(d->latest); | |
359 | } | |
360 | ||
fd38203a | 361 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
362 | sd_event_source *s; |
363 | ||
fd38203a | 364 | assert(e); |
a71fe8b8 LP |
365 | |
366 | while ((s = e->sources)) { | |
367 | assert(s->floating); | |
368 | source_disconnect(s); | |
369 | sd_event_source_unref(s); | |
370 | } | |
371 | ||
15b38f93 | 372 | assert(e->n_sources == 0); |
fd38203a | 373 | |
afc6adb5 LP |
374 | if (e->default_event_ptr) |
375 | *(e->default_event_ptr) = NULL; | |
376 | ||
03e334a1 | 377 | safe_close(e->epoll_fd); |
03e334a1 | 378 | safe_close(e->watchdog_fd); |
cde93897 | 379 | |
6a0f1f6d | 380 | free_clock_data(&e->realtime); |
a8548816 | 381 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
382 | free_clock_data(&e->monotonic); |
383 | free_clock_data(&e->realtime_alarm); | |
384 | free_clock_data(&e->boottime_alarm); | |
385 | ||
fd38203a LP |
386 | prioq_free(e->pending); |
387 | prioq_free(e->prepare); | |
6203e07a | 388 | prioq_free(e->exit); |
fd38203a LP |
389 | |
390 | free(e->signal_sources); | |
9da4cb2b | 391 | hashmap_free(e->signal_data); |
fd38203a LP |
392 | |
393 | hashmap_free(e->child_sources); | |
6e9feda3 | 394 | set_free(e->post_sources); |
fd38203a LP |
395 | free(e); |
396 | } | |
397 | ||
f7262a9f | 398 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
399 | sd_event *e; |
400 | int r; | |
401 | ||
305f78bf | 402 | assert_return(ret, -EINVAL); |
fd38203a LP |
403 | |
404 | e = new0(sd_event, 1); | |
405 | if (!e) | |
406 | return -ENOMEM; | |
407 | ||
da7e457c | 408 | e->n_ref = 1; |
9da4cb2b | 409 | 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 | 410 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
9da4cb2b | 411 | e->realtime.wakeup = e->boottime.wakeup = e->monotonic.wakeup = e->realtime_alarm.wakeup = e->boottime_alarm.wakeup = WAKEUP_CLOCK_DATA; |
eaa3cbef | 412 | e->original_pid = getpid(); |
3a43da28 | 413 | e->perturb = USEC_INFINITY; |
fd38203a | 414 | |
fd38203a LP |
415 | e->pending = prioq_new(pending_prioq_compare); |
416 | if (!e->pending) { | |
417 | r = -ENOMEM; | |
418 | goto fail; | |
419 | } | |
420 | ||
421 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
422 | if (e->epoll_fd < 0) { | |
423 | r = -errno; | |
424 | goto fail; | |
425 | } | |
426 | ||
427 | *ret = e; | |
428 | return 0; | |
429 | ||
430 | fail: | |
431 | event_free(e); | |
432 | return r; | |
433 | } | |
434 | ||
f7262a9f | 435 | _public_ sd_event* sd_event_ref(sd_event *e) { |
305f78bf | 436 | assert_return(e, NULL); |
fd38203a | 437 | |
da7e457c LP |
438 | assert(e->n_ref >= 1); |
439 | e->n_ref++; | |
fd38203a LP |
440 | |
441 | return e; | |
442 | } | |
443 | ||
f7262a9f | 444 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
445 | |
446 | if (!e) | |
447 | return NULL; | |
fd38203a | 448 | |
da7e457c LP |
449 | assert(e->n_ref >= 1); |
450 | e->n_ref--; | |
451 | ||
452 | if (e->n_ref <= 0) | |
fd38203a LP |
453 | event_free(e); |
454 | ||
455 | return NULL; | |
456 | } | |
457 | ||
eaa3cbef LP |
458 | static bool event_pid_changed(sd_event *e) { |
459 | assert(e); | |
460 | ||
a2360a46 | 461 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
462 | * it around over a fork(). Let's complain. */ |
463 | ||
464 | return e->original_pid != getpid(); | |
465 | } | |
466 | ||
366e6411 | 467 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
468 | int r; |
469 | ||
470 | assert(s); | |
471 | assert(s->type == SOURCE_IO); | |
472 | ||
f6806734 | 473 | if (event_pid_changed(s->event)) |
366e6411 | 474 | return; |
f6806734 | 475 | |
fd38203a | 476 | if (!s->io.registered) |
366e6411 | 477 | return; |
fd38203a LP |
478 | |
479 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
556c25cf LP |
480 | if (r < 0) |
481 | log_debug_errno(errno, "Failed to remove source %s from epoll: %m", strna(s->description)); | |
fd38203a LP |
482 | |
483 | s->io.registered = false; | |
fd38203a LP |
484 | } |
485 | ||
305f78bf LP |
486 | static int source_io_register( |
487 | sd_event_source *s, | |
488 | int enabled, | |
489 | uint32_t events) { | |
490 | ||
fd38203a LP |
491 | struct epoll_event ev = {}; |
492 | int r; | |
493 | ||
494 | assert(s); | |
495 | assert(s->type == SOURCE_IO); | |
baf76283 | 496 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
497 | |
498 | ev.events = events; | |
499 | ev.data.ptr = s; | |
500 | ||
baf76283 | 501 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
502 | ev.events |= EPOLLONESHOT; |
503 | ||
504 | if (s->io.registered) | |
505 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
506 | else | |
507 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
fd38203a LP |
508 | if (r < 0) |
509 | return -errno; | |
510 | ||
511 | s->io.registered = true; | |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
6a0f1f6d LP |
516 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
517 | ||
518 | switch (t) { | |
519 | ||
520 | case SOURCE_TIME_REALTIME: | |
521 | return CLOCK_REALTIME; | |
522 | ||
a8548816 TG |
523 | case SOURCE_TIME_BOOTTIME: |
524 | return CLOCK_BOOTTIME; | |
525 | ||
6a0f1f6d LP |
526 | case SOURCE_TIME_MONOTONIC: |
527 | return CLOCK_MONOTONIC; | |
528 | ||
529 | case SOURCE_TIME_REALTIME_ALARM: | |
530 | return CLOCK_REALTIME_ALARM; | |
531 | ||
532 | case SOURCE_TIME_BOOTTIME_ALARM: | |
533 | return CLOCK_BOOTTIME_ALARM; | |
534 | ||
535 | default: | |
536 | return (clockid_t) -1; | |
537 | } | |
538 | } | |
539 | ||
540 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
541 | ||
542 | switch (clock) { | |
543 | ||
544 | case CLOCK_REALTIME: | |
545 | return SOURCE_TIME_REALTIME; | |
546 | ||
a8548816 TG |
547 | case CLOCK_BOOTTIME: |
548 | return SOURCE_TIME_BOOTTIME; | |
549 | ||
6a0f1f6d LP |
550 | case CLOCK_MONOTONIC: |
551 | return SOURCE_TIME_MONOTONIC; | |
552 | ||
553 | case CLOCK_REALTIME_ALARM: | |
554 | return SOURCE_TIME_REALTIME_ALARM; | |
555 | ||
556 | case CLOCK_BOOTTIME_ALARM: | |
557 | return SOURCE_TIME_BOOTTIME_ALARM; | |
558 | ||
559 | default: | |
560 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
561 | } | |
562 | } | |
563 | ||
564 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
565 | assert(e); | |
566 | ||
567 | switch (t) { | |
568 | ||
569 | case SOURCE_TIME_REALTIME: | |
570 | return &e->realtime; | |
571 | ||
a8548816 TG |
572 | case SOURCE_TIME_BOOTTIME: |
573 | return &e->boottime; | |
574 | ||
6a0f1f6d LP |
575 | case SOURCE_TIME_MONOTONIC: |
576 | return &e->monotonic; | |
577 | ||
578 | case SOURCE_TIME_REALTIME_ALARM: | |
579 | return &e->realtime_alarm; | |
580 | ||
581 | case SOURCE_TIME_BOOTTIME_ALARM: | |
582 | return &e->boottime_alarm; | |
583 | ||
584 | default: | |
585 | return NULL; | |
586 | } | |
587 | } | |
588 | ||
9da4cb2b LP |
589 | static int event_make_signal_data( |
590 | sd_event *e, | |
591 | int sig, | |
592 | struct signal_data **ret) { | |
4807d2d0 | 593 | |
f95387cd | 594 | struct epoll_event ev = {}; |
9da4cb2b LP |
595 | struct signal_data *d; |
596 | bool added = false; | |
597 | sigset_t ss_copy; | |
598 | int64_t priority; | |
f95387cd ZJS |
599 | int r; |
600 | ||
601 | assert(e); | |
602 | ||
f6806734 | 603 | if (event_pid_changed(e)) |
9da4cb2b | 604 | return -ECHILD; |
f6806734 | 605 | |
9da4cb2b LP |
606 | if (e->signal_sources && e->signal_sources[sig]) |
607 | priority = e->signal_sources[sig]->priority; | |
608 | else | |
609 | priority = 0; | |
f95387cd | 610 | |
9da4cb2b LP |
611 | d = hashmap_get(e->signal_data, &priority); |
612 | if (d) { | |
613 | if (sigismember(&d->sigset, sig) > 0) { | |
614 | if (ret) | |
615 | *ret = d; | |
616 | return 0; | |
617 | } | |
618 | } else { | |
619 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); | |
620 | if (r < 0) | |
621 | return r; | |
622 | ||
623 | d = new0(struct signal_data, 1); | |
624 | if (!d) | |
625 | return -ENOMEM; | |
626 | ||
627 | d->wakeup = WAKEUP_SIGNAL_DATA; | |
628 | d->fd = -1; | |
629 | d->priority = priority; | |
630 | ||
631 | r = hashmap_put(e->signal_data, &d->priority, d); | |
632 | if (r < 0) | |
633 | return r; | |
f95387cd | 634 | |
9da4cb2b LP |
635 | added = true; |
636 | } | |
637 | ||
638 | ss_copy = d->sigset; | |
639 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
640 | ||
641 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
642 | if (r < 0) { | |
643 | r = -errno; | |
644 | goto fail; | |
645 | } | |
646 | ||
647 | d->sigset = ss_copy; | |
f95387cd | 648 | |
9da4cb2b LP |
649 | if (d->fd >= 0) { |
650 | if (ret) | |
651 | *ret = d; | |
f95387cd | 652 | return 0; |
9da4cb2b LP |
653 | } |
654 | ||
655 | d->fd = r; | |
f95387cd ZJS |
656 | |
657 | ev.events = EPOLLIN; | |
9da4cb2b | 658 | ev.data.ptr = d; |
f95387cd | 659 | |
9da4cb2b LP |
660 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
661 | if (r < 0) { | |
662 | r = -errno; | |
663 | goto fail; | |
f95387cd ZJS |
664 | } |
665 | ||
9da4cb2b LP |
666 | if (ret) |
667 | *ret = d; | |
668 | ||
f95387cd | 669 | return 0; |
9da4cb2b LP |
670 | |
671 | fail: | |
672 | if (added) { | |
673 | d->fd = safe_close(d->fd); | |
674 | hashmap_remove(e->signal_data, &d->priority); | |
675 | free(d); | |
676 | } | |
677 | ||
678 | return r; | |
679 | } | |
680 | ||
681 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
682 | assert(e); | |
683 | assert(d); | |
684 | ||
685 | /* Turns off the specified signal in the signal data | |
686 | * object. If the signal mask of the object becomes empty that | |
687 | * way removes it. */ | |
688 | ||
689 | if (sigismember(&d->sigset, sig) == 0) | |
690 | return; | |
691 | ||
692 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
693 | ||
694 | if (sigisemptyset(&d->sigset)) { | |
695 | ||
696 | /* If all the mask is all-zero we can get rid of the structure */ | |
697 | hashmap_remove(e->signal_data, &d->priority); | |
698 | assert(!d->current); | |
699 | safe_close(d->fd); | |
700 | free(d); | |
701 | return; | |
702 | } | |
703 | ||
704 | assert(d->fd >= 0); | |
705 | ||
706 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
707 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
708 | } | |
709 | ||
710 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
711 | struct signal_data *d; | |
712 | static const int64_t zero_priority = 0; | |
713 | ||
714 | assert(e); | |
715 | ||
716 | /* Rechecks if the specified signal is still something we are | |
717 | * interested in. If not, we'll unmask it, and possibly drop | |
718 | * the signalfd for it. */ | |
719 | ||
720 | if (sig == SIGCHLD && | |
721 | e->n_enabled_child_sources > 0) | |
722 | return; | |
723 | ||
724 | if (e->signal_sources && | |
725 | e->signal_sources[sig] && | |
726 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
727 | return; | |
728 | ||
729 | /* | |
730 | * The specified signal might be enabled in three different queues: | |
731 | * | |
732 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
733 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
734 | * 3) the 0 priority (to cover the SIGCHLD case) | |
735 | * | |
736 | * Hence, let's remove it from all three here. | |
737 | */ | |
738 | ||
739 | if (priority) { | |
740 | d = hashmap_get(e->signal_data, priority); | |
741 | if (d) | |
742 | event_unmask_signal_data(e, d, sig); | |
743 | } | |
744 | ||
745 | if (e->signal_sources && e->signal_sources[sig]) { | |
746 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
747 | if (d) | |
748 | event_unmask_signal_data(e, d, sig); | |
749 | } | |
750 | ||
751 | d = hashmap_get(e->signal_data, &zero_priority); | |
752 | if (d) | |
753 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
754 | } |
755 | ||
a71fe8b8 LP |
756 | static void source_disconnect(sd_event_source *s) { |
757 | sd_event *event; | |
758 | ||
fd38203a LP |
759 | assert(s); |
760 | ||
a71fe8b8 LP |
761 | if (!s->event) |
762 | return; | |
15b38f93 | 763 | |
a71fe8b8 | 764 | assert(s->event->n_sources > 0); |
fd38203a | 765 | |
a71fe8b8 | 766 | switch (s->type) { |
fd38203a | 767 | |
a71fe8b8 LP |
768 | case SOURCE_IO: |
769 | if (s->io.fd >= 0) | |
770 | source_io_unregister(s); | |
fd38203a | 771 | |
a71fe8b8 | 772 | break; |
6a0f1f6d | 773 | |
a71fe8b8 | 774 | case SOURCE_TIME_REALTIME: |
a8548816 | 775 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
776 | case SOURCE_TIME_MONOTONIC: |
777 | case SOURCE_TIME_REALTIME_ALARM: | |
778 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
779 | struct clock_data *d; | |
fd38203a | 780 | |
a71fe8b8 LP |
781 | d = event_get_clock_data(s->event, s->type); |
782 | assert(d); | |
783 | ||
784 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
785 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 786 | d->needs_rearm = true; |
a71fe8b8 LP |
787 | break; |
788 | } | |
789 | ||
790 | case SOURCE_SIGNAL: | |
791 | if (s->signal.sig > 0) { | |
9da4cb2b | 792 | |
a71fe8b8 LP |
793 | if (s->event->signal_sources) |
794 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 795 | |
9da4cb2b | 796 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 797 | } |
fd38203a | 798 | |
a71fe8b8 | 799 | break; |
fd38203a | 800 | |
a71fe8b8 LP |
801 | case SOURCE_CHILD: |
802 | if (s->child.pid > 0) { | |
803 | if (s->enabled != SD_EVENT_OFF) { | |
804 | assert(s->event->n_enabled_child_sources > 0); | |
805 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 806 | } |
fd38203a | 807 | |
9da4cb2b LP |
808 | (void) hashmap_remove(s->event->child_sources, INT_TO_PTR(s->child.pid)); |
809 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
a71fe8b8 | 810 | } |
fd38203a | 811 | |
a71fe8b8 | 812 | break; |
fd38203a | 813 | |
a71fe8b8 LP |
814 | case SOURCE_DEFER: |
815 | /* nothing */ | |
816 | break; | |
fd38203a | 817 | |
a71fe8b8 LP |
818 | case SOURCE_POST: |
819 | set_remove(s->event->post_sources, s); | |
820 | break; | |
da7e457c | 821 | |
a71fe8b8 LP |
822 | case SOURCE_EXIT: |
823 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
824 | break; | |
0eb2e0e3 | 825 | |
a71fe8b8 LP |
826 | default: |
827 | assert_not_reached("Wut? I shouldn't exist."); | |
828 | } | |
6e9feda3 | 829 | |
a71fe8b8 LP |
830 | if (s->pending) |
831 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 832 | |
a71fe8b8 LP |
833 | if (s->prepare) |
834 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 835 | |
a71fe8b8 | 836 | event = s->event; |
fd38203a | 837 | |
a71fe8b8 LP |
838 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
839 | s->event = NULL; | |
840 | LIST_REMOVE(sources, event->sources, s); | |
841 | event->n_sources--; | |
fd38203a | 842 | |
a71fe8b8 LP |
843 | if (!s->floating) |
844 | sd_event_unref(event); | |
845 | } | |
846 | ||
847 | static void source_free(sd_event_source *s) { | |
848 | assert(s); | |
fd38203a | 849 | |
a71fe8b8 | 850 | source_disconnect(s); |
356779df | 851 | free(s->description); |
fd38203a LP |
852 | free(s); |
853 | } | |
854 | ||
855 | static int source_set_pending(sd_event_source *s, bool b) { | |
856 | int r; | |
857 | ||
858 | assert(s); | |
6203e07a | 859 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
860 | |
861 | if (s->pending == b) | |
862 | return 0; | |
863 | ||
864 | s->pending = b; | |
865 | ||
866 | if (b) { | |
867 | s->pending_iteration = s->event->iteration; | |
868 | ||
869 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
870 | if (r < 0) { | |
871 | s->pending = false; | |
872 | return r; | |
873 | } | |
874 | } else | |
875 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
876 | ||
6a0f1f6d LP |
877 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
878 | struct clock_data *d; | |
879 | ||
880 | d = event_get_clock_data(s->event, s->type); | |
881 | assert(d); | |
882 | ||
883 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
884 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 885 | d->needs_rearm = true; |
2576a19e LP |
886 | } |
887 | ||
9da4cb2b LP |
888 | if (s->type == SOURCE_SIGNAL && !b) { |
889 | struct signal_data *d; | |
890 | ||
891 | d = hashmap_get(s->event->signal_data, &s->priority); | |
892 | if (d && d->current == s) | |
893 | d->current = NULL; | |
894 | } | |
895 | ||
fd38203a LP |
896 | return 0; |
897 | } | |
898 | ||
a71fe8b8 | 899 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
900 | sd_event_source *s; |
901 | ||
902 | assert(e); | |
903 | ||
904 | s = new0(sd_event_source, 1); | |
905 | if (!s) | |
906 | return NULL; | |
907 | ||
da7e457c | 908 | s->n_ref = 1; |
a71fe8b8 | 909 | s->event = e; |
4a134c49 | 910 | s->floating = floating; |
fd38203a | 911 | s->type = type; |
fd38203a | 912 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
913 | |
914 | if (!floating) | |
915 | sd_event_ref(e); | |
fd38203a | 916 | |
a71fe8b8 | 917 | LIST_PREPEND(sources, e->sources, s); |
15b38f93 LP |
918 | e->n_sources ++; |
919 | ||
fd38203a LP |
920 | return s; |
921 | } | |
922 | ||
f7262a9f | 923 | _public_ int sd_event_add_io( |
fd38203a | 924 | sd_event *e, |
151b9b96 | 925 | sd_event_source **ret, |
fd38203a LP |
926 | int fd, |
927 | uint32_t events, | |
718db961 | 928 | sd_event_io_handler_t callback, |
151b9b96 | 929 | void *userdata) { |
fd38203a LP |
930 | |
931 | sd_event_source *s; | |
932 | int r; | |
933 | ||
305f78bf | 934 | assert_return(e, -EINVAL); |
8ac43fee | 935 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 936 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 937 | assert_return(callback, -EINVAL); |
da7e457c | 938 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 939 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 940 | |
a71fe8b8 | 941 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
942 | if (!s) |
943 | return -ENOMEM; | |
944 | ||
9da4cb2b | 945 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
946 | s->io.fd = fd; |
947 | s->io.events = events; | |
948 | s->io.callback = callback; | |
949 | s->userdata = userdata; | |
baf76283 | 950 | s->enabled = SD_EVENT_ON; |
fd38203a | 951 | |
baf76283 | 952 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
953 | if (r < 0) { |
954 | source_free(s); | |
050f74f2 | 955 | return r; |
fd38203a LP |
956 | } |
957 | ||
a71fe8b8 LP |
958 | if (ret) |
959 | *ret = s; | |
960 | ||
fd38203a LP |
961 | return 0; |
962 | } | |
963 | ||
52444dc4 LP |
964 | static void initialize_perturb(sd_event *e) { |
965 | sd_id128_t bootid = {}; | |
966 | ||
967 | /* When we sleep for longer, we try to realign the wakeup to | |
968 | the same time wihtin each minute/second/250ms, so that | |
969 | events all across the system can be coalesced into a single | |
970 | CPU wakeup. However, let's take some system-specific | |
971 | randomness for this value, so that in a network of systems | |
972 | with synced clocks timer events are distributed a | |
973 | bit. Here, we calculate a perturbation usec offset from the | |
974 | boot ID. */ | |
975 | ||
3a43da28 | 976 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
977 | return; |
978 | ||
979 | if (sd_id128_get_boot(&bootid) >= 0) | |
980 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
981 | } | |
982 | ||
fd38203a LP |
983 | static int event_setup_timer_fd( |
984 | sd_event *e, | |
6a0f1f6d LP |
985 | struct clock_data *d, |
986 | clockid_t clock) { | |
fd38203a LP |
987 | |
988 | struct epoll_event ev = {}; | |
989 | int r, fd; | |
990 | ||
991 | assert(e); | |
6a0f1f6d | 992 | assert(d); |
fd38203a | 993 | |
6a0f1f6d | 994 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
995 | return 0; |
996 | ||
6a0f1f6d | 997 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
998 | if (fd < 0) |
999 | return -errno; | |
1000 | ||
1001 | ev.events = EPOLLIN; | |
9da4cb2b | 1002 | ev.data.ptr = d; |
fd38203a LP |
1003 | |
1004 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
1005 | if (r < 0) { | |
03e334a1 | 1006 | safe_close(fd); |
fd38203a LP |
1007 | return -errno; |
1008 | } | |
1009 | ||
6a0f1f6d | 1010 | d->fd = fd; |
fd38203a LP |
1011 | return 0; |
1012 | } | |
1013 | ||
c4f1aff2 TG |
1014 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1015 | assert(s); | |
1016 | ||
1017 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1018 | } | |
1019 | ||
6a0f1f6d | 1020 | _public_ int sd_event_add_time( |
fd38203a | 1021 | sd_event *e, |
151b9b96 | 1022 | sd_event_source **ret, |
6a0f1f6d | 1023 | clockid_t clock, |
fd38203a | 1024 | uint64_t usec, |
c2ba3ad6 | 1025 | uint64_t accuracy, |
718db961 | 1026 | sd_event_time_handler_t callback, |
151b9b96 | 1027 | void *userdata) { |
fd38203a | 1028 | |
6a0f1f6d | 1029 | EventSourceType type; |
fd38203a | 1030 | sd_event_source *s; |
6a0f1f6d | 1031 | struct clock_data *d; |
fd38203a LP |
1032 | int r; |
1033 | ||
305f78bf | 1034 | assert_return(e, -EINVAL); |
305f78bf LP |
1035 | assert_return(usec != (uint64_t) -1, -EINVAL); |
1036 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
da7e457c | 1037 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1038 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1039 | |
c4f1aff2 TG |
1040 | if (!callback) |
1041 | callback = time_exit_callback; | |
1042 | ||
6a0f1f6d | 1043 | type = clock_to_event_source_type(clock); |
15411c0c | 1044 | assert_return(type >= 0, -EOPNOTSUPP); |
6a0f1f6d LP |
1045 | |
1046 | d = event_get_clock_data(e, type); | |
1047 | assert(d); | |
c2ba3ad6 | 1048 | |
6a0f1f6d LP |
1049 | if (!d->earliest) { |
1050 | d->earliest = prioq_new(earliest_time_prioq_compare); | |
1051 | if (!d->earliest) | |
c2ba3ad6 LP |
1052 | return -ENOMEM; |
1053 | } | |
fd38203a | 1054 | |
6a0f1f6d LP |
1055 | if (!d->latest) { |
1056 | d->latest = prioq_new(latest_time_prioq_compare); | |
1057 | if (!d->latest) | |
fd38203a LP |
1058 | return -ENOMEM; |
1059 | } | |
1060 | ||
6a0f1f6d LP |
1061 | if (d->fd < 0) { |
1062 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1063 | if (r < 0) |
1064 | return r; | |
1065 | } | |
1066 | ||
a71fe8b8 | 1067 | s = source_new(e, !ret, type); |
fd38203a LP |
1068 | if (!s) |
1069 | return -ENOMEM; | |
1070 | ||
1071 | s->time.next = usec; | |
c2ba3ad6 | 1072 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1073 | s->time.callback = callback; |
da7e457c | 1074 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1075 | s->userdata = userdata; |
baf76283 | 1076 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1077 | |
e07bbb7c TG |
1078 | d->needs_rearm = true; |
1079 | ||
6a0f1f6d | 1080 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
1081 | if (r < 0) |
1082 | goto fail; | |
1083 | ||
6a0f1f6d | 1084 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
1085 | if (r < 0) |
1086 | goto fail; | |
fd38203a | 1087 | |
a71fe8b8 LP |
1088 | if (ret) |
1089 | *ret = s; | |
1090 | ||
fd38203a | 1091 | return 0; |
c2ba3ad6 LP |
1092 | |
1093 | fail: | |
1094 | source_free(s); | |
1095 | return r; | |
fd38203a LP |
1096 | } |
1097 | ||
59bc1fd7 LP |
1098 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1099 | assert(s); | |
1100 | ||
1101 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1102 | } | |
1103 | ||
f7262a9f | 1104 | _public_ int sd_event_add_signal( |
305f78bf | 1105 | sd_event *e, |
151b9b96 | 1106 | sd_event_source **ret, |
305f78bf | 1107 | int sig, |
718db961 | 1108 | sd_event_signal_handler_t callback, |
151b9b96 | 1109 | void *userdata) { |
305f78bf | 1110 | |
fd38203a | 1111 | sd_event_source *s; |
9da4cb2b | 1112 | struct signal_data *d; |
3022d74b | 1113 | sigset_t ss; |
fd38203a LP |
1114 | int r; |
1115 | ||
305f78bf LP |
1116 | assert_return(e, -EINVAL); |
1117 | assert_return(sig > 0, -EINVAL); | |
1118 | assert_return(sig < _NSIG, -EINVAL); | |
da7e457c | 1119 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1120 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1121 | |
59bc1fd7 LP |
1122 | if (!callback) |
1123 | callback = signal_exit_callback; | |
1124 | ||
3022d74b | 1125 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
50e0d56c LP |
1126 | if (r != 0) |
1127 | return -r; | |
3022d74b LP |
1128 | |
1129 | if (!sigismember(&ss, sig)) | |
1130 | return -EBUSY; | |
1131 | ||
fd38203a LP |
1132 | if (!e->signal_sources) { |
1133 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1134 | if (!e->signal_sources) | |
1135 | return -ENOMEM; | |
1136 | } else if (e->signal_sources[sig]) | |
1137 | return -EBUSY; | |
1138 | ||
a71fe8b8 | 1139 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1140 | if (!s) |
1141 | return -ENOMEM; | |
1142 | ||
1143 | s->signal.sig = sig; | |
1144 | s->signal.callback = callback; | |
1145 | s->userdata = userdata; | |
baf76283 | 1146 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1147 | |
1148 | e->signal_sources[sig] = s; | |
fd38203a | 1149 | |
9da4cb2b LP |
1150 | r = event_make_signal_data(e, sig, &d); |
1151 | if (r < 0) { | |
1152 | source_free(s); | |
1153 | return r; | |
fd38203a LP |
1154 | } |
1155 | ||
f1f00dbb LP |
1156 | /* Use the signal name as description for the event source by default */ |
1157 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1158 | ||
a71fe8b8 LP |
1159 | if (ret) |
1160 | *ret = s; | |
1161 | ||
fd38203a LP |
1162 | return 0; |
1163 | } | |
1164 | ||
f7262a9f | 1165 | _public_ int sd_event_add_child( |
305f78bf | 1166 | sd_event *e, |
151b9b96 | 1167 | sd_event_source **ret, |
305f78bf LP |
1168 | pid_t pid, |
1169 | int options, | |
718db961 | 1170 | sd_event_child_handler_t callback, |
151b9b96 | 1171 | void *userdata) { |
305f78bf | 1172 | |
fd38203a LP |
1173 | sd_event_source *s; |
1174 | int r; | |
1175 | ||
305f78bf LP |
1176 | assert_return(e, -EINVAL); |
1177 | assert_return(pid > 1, -EINVAL); | |
1178 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1179 | assert_return(options != 0, -EINVAL); | |
1180 | assert_return(callback, -EINVAL); | |
da7e457c | 1181 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1182 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1183 | |
d5099efc | 1184 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1185 | if (r < 0) |
1186 | return r; | |
1187 | ||
1188 | if (hashmap_contains(e->child_sources, INT_TO_PTR(pid))) | |
1189 | return -EBUSY; | |
1190 | ||
a71fe8b8 | 1191 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1192 | if (!s) |
1193 | return -ENOMEM; | |
1194 | ||
1195 | s->child.pid = pid; | |
1196 | s->child.options = options; | |
1197 | s->child.callback = callback; | |
1198 | s->userdata = userdata; | |
baf76283 | 1199 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1200 | |
1201 | r = hashmap_put(e->child_sources, INT_TO_PTR(pid), s); | |
1202 | if (r < 0) { | |
1203 | source_free(s); | |
1204 | return r; | |
1205 | } | |
1206 | ||
baf76283 | 1207 | e->n_enabled_child_sources ++; |
fd38203a | 1208 | |
9da4cb2b LP |
1209 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1210 | if (r < 0) { | |
1211 | e->n_enabled_child_sources--; | |
1212 | source_free(s); | |
1213 | return r; | |
fd38203a LP |
1214 | } |
1215 | ||
c2ba3ad6 LP |
1216 | e->need_process_child = true; |
1217 | ||
a71fe8b8 LP |
1218 | if (ret) |
1219 | *ret = s; | |
1220 | ||
fd38203a LP |
1221 | return 0; |
1222 | } | |
1223 | ||
f7262a9f | 1224 | _public_ int sd_event_add_defer( |
305f78bf | 1225 | sd_event *e, |
151b9b96 | 1226 | sd_event_source **ret, |
718db961 | 1227 | sd_event_handler_t callback, |
151b9b96 | 1228 | void *userdata) { |
305f78bf | 1229 | |
fd38203a LP |
1230 | sd_event_source *s; |
1231 | int r; | |
1232 | ||
305f78bf LP |
1233 | assert_return(e, -EINVAL); |
1234 | assert_return(callback, -EINVAL); | |
da7e457c | 1235 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1236 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1237 | |
a71fe8b8 | 1238 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1239 | if (!s) |
1240 | return -ENOMEM; | |
1241 | ||
1242 | s->defer.callback = callback; | |
1243 | s->userdata = userdata; | |
baf76283 | 1244 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1245 | |
1246 | r = source_set_pending(s, true); | |
1247 | if (r < 0) { | |
1248 | source_free(s); | |
1249 | return r; | |
1250 | } | |
1251 | ||
a71fe8b8 LP |
1252 | if (ret) |
1253 | *ret = s; | |
1254 | ||
fd38203a LP |
1255 | return 0; |
1256 | } | |
1257 | ||
6e9feda3 LP |
1258 | _public_ int sd_event_add_post( |
1259 | sd_event *e, | |
1260 | sd_event_source **ret, | |
1261 | sd_event_handler_t callback, | |
1262 | void *userdata) { | |
1263 | ||
1264 | sd_event_source *s; | |
1265 | int r; | |
1266 | ||
1267 | assert_return(e, -EINVAL); | |
1268 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1269 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1270 | assert_return(!event_pid_changed(e), -ECHILD); | |
1271 | ||
d5099efc | 1272 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1273 | if (r < 0) |
1274 | return r; | |
1275 | ||
a71fe8b8 | 1276 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1277 | if (!s) |
1278 | return -ENOMEM; | |
1279 | ||
1280 | s->post.callback = callback; | |
1281 | s->userdata = userdata; | |
1282 | s->enabled = SD_EVENT_ON; | |
1283 | ||
1284 | r = set_put(e->post_sources, s); | |
1285 | if (r < 0) { | |
1286 | source_free(s); | |
1287 | return r; | |
1288 | } | |
1289 | ||
a71fe8b8 LP |
1290 | if (ret) |
1291 | *ret = s; | |
1292 | ||
6e9feda3 LP |
1293 | return 0; |
1294 | } | |
1295 | ||
6203e07a | 1296 | _public_ int sd_event_add_exit( |
305f78bf | 1297 | sd_event *e, |
151b9b96 | 1298 | sd_event_source **ret, |
718db961 | 1299 | sd_event_handler_t callback, |
151b9b96 | 1300 | void *userdata) { |
305f78bf | 1301 | |
da7e457c LP |
1302 | sd_event_source *s; |
1303 | int r; | |
1304 | ||
1305 | assert_return(e, -EINVAL); | |
1306 | assert_return(callback, -EINVAL); | |
1307 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1308 | assert_return(!event_pid_changed(e), -ECHILD); | |
1309 | ||
6203e07a LP |
1310 | if (!e->exit) { |
1311 | e->exit = prioq_new(exit_prioq_compare); | |
1312 | if (!e->exit) | |
da7e457c LP |
1313 | return -ENOMEM; |
1314 | } | |
1315 | ||
a71fe8b8 | 1316 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1317 | if (!s) |
da7e457c | 1318 | return -ENOMEM; |
fd38203a | 1319 | |
6203e07a | 1320 | s->exit.callback = callback; |
da7e457c | 1321 | s->userdata = userdata; |
6203e07a | 1322 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1323 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1324 | |
6203e07a | 1325 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1326 | if (r < 0) { |
1327 | source_free(s); | |
1328 | return r; | |
1329 | } | |
1330 | ||
a71fe8b8 LP |
1331 | if (ret) |
1332 | *ret = s; | |
1333 | ||
da7e457c LP |
1334 | return 0; |
1335 | } | |
1336 | ||
f7262a9f | 1337 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
da7e457c LP |
1338 | assert_return(s, NULL); |
1339 | ||
1340 | assert(s->n_ref >= 1); | |
1341 | s->n_ref++; | |
fd38203a LP |
1342 | |
1343 | return s; | |
1344 | } | |
1345 | ||
f7262a9f | 1346 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1347 | |
1348 | if (!s) | |
1349 | return NULL; | |
fd38203a | 1350 | |
da7e457c LP |
1351 | assert(s->n_ref >= 1); |
1352 | s->n_ref--; | |
1353 | ||
12179984 LP |
1354 | if (s->n_ref <= 0) { |
1355 | /* Here's a special hack: when we are called from a | |
1356 | * dispatch handler we won't free the event source | |
1357 | * immediately, but we will detach the fd from the | |
1358 | * epoll. This way it is safe for the caller to unref | |
1359 | * the event source and immediately close the fd, but | |
1360 | * we still retain a valid event source object after | |
1361 | * the callback. */ | |
1362 | ||
1363 | if (s->dispatching) { | |
1364 | if (s->type == SOURCE_IO) | |
1365 | source_io_unregister(s); | |
a71fe8b8 LP |
1366 | |
1367 | source_disconnect(s); | |
12179984 LP |
1368 | } else |
1369 | source_free(s); | |
1370 | } | |
fd38203a LP |
1371 | |
1372 | return NULL; | |
1373 | } | |
1374 | ||
356779df | 1375 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1376 | assert_return(s, -EINVAL); |
f4b2933e | 1377 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1378 | |
356779df | 1379 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1380 | } |
1381 | ||
356779df | 1382 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1383 | assert_return(s, -EINVAL); |
356779df | 1384 | assert_return(description, -EINVAL); |
f4b2933e LP |
1385 | assert_return(s->description, -ENXIO); |
1386 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
f7f53e9e | 1387 | |
356779df | 1388 | *description = s->description; |
f7f53e9e TG |
1389 | return 0; |
1390 | } | |
1391 | ||
adcc4ca3 | 1392 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1393 | assert_return(s, NULL); |
eaa3cbef LP |
1394 | |
1395 | return s->event; | |
1396 | } | |
1397 | ||
f7262a9f | 1398 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1399 | assert_return(s, -EINVAL); |
6203e07a | 1400 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1401 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1402 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1403 | |
1404 | return s->pending; | |
1405 | } | |
1406 | ||
f7262a9f | 1407 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1408 | assert_return(s, -EINVAL); |
1409 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1410 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1411 | |
1412 | return s->io.fd; | |
1413 | } | |
1414 | ||
30caf8f3 LP |
1415 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1416 | int r; | |
1417 | ||
1418 | assert_return(s, -EINVAL); | |
8ac43fee | 1419 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1420 | assert_return(s->type == SOURCE_IO, -EDOM); |
1421 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1422 | ||
1423 | if (s->io.fd == fd) | |
1424 | return 0; | |
1425 | ||
1426 | if (s->enabled == SD_EVENT_OFF) { | |
1427 | s->io.fd = fd; | |
1428 | s->io.registered = false; | |
1429 | } else { | |
1430 | int saved_fd; | |
1431 | ||
1432 | saved_fd = s->io.fd; | |
1433 | assert(s->io.registered); | |
1434 | ||
1435 | s->io.fd = fd; | |
1436 | s->io.registered = false; | |
1437 | ||
1438 | r = source_io_register(s, s->enabled, s->io.events); | |
1439 | if (r < 0) { | |
1440 | s->io.fd = saved_fd; | |
1441 | s->io.registered = true; | |
1442 | return r; | |
1443 | } | |
1444 | ||
1445 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1446 | } | |
1447 | ||
1448 | return 0; | |
1449 | } | |
1450 | ||
f7262a9f | 1451 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1452 | assert_return(s, -EINVAL); |
1453 | assert_return(events, -EINVAL); | |
1454 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1455 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1456 | |
1457 | *events = s->io.events; | |
1458 | return 0; | |
1459 | } | |
1460 | ||
f7262a9f | 1461 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1462 | int r; |
1463 | ||
305f78bf LP |
1464 | assert_return(s, -EINVAL); |
1465 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1466 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1467 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1468 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1469 | |
b63c8d4f DH |
1470 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1471 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1472 | return 0; |
1473 | ||
baf76283 | 1474 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1475 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1476 | if (r < 0) |
1477 | return r; | |
1478 | } | |
1479 | ||
1480 | s->io.events = events; | |
503f39c3 | 1481 | source_set_pending(s, false); |
fd38203a LP |
1482 | |
1483 | return 0; | |
1484 | } | |
1485 | ||
f7262a9f | 1486 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1487 | assert_return(s, -EINVAL); |
1488 | assert_return(revents, -EINVAL); | |
1489 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1490 | assert_return(s->pending, -ENODATA); | |
1491 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1492 | |
1493 | *revents = s->io.revents; | |
1494 | return 0; | |
1495 | } | |
1496 | ||
f7262a9f | 1497 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1498 | assert_return(s, -EINVAL); |
1499 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1500 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1501 | |
1502 | return s->signal.sig; | |
1503 | } | |
1504 | ||
31927c16 | 1505 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1506 | assert_return(s, -EINVAL); |
1507 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1508 | |
1509 | return s->priority; | |
1510 | } | |
1511 | ||
31927c16 | 1512 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
9da4cb2b LP |
1513 | int r; |
1514 | ||
305f78bf | 1515 | assert_return(s, -EINVAL); |
da7e457c | 1516 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1517 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1518 | |
1519 | if (s->priority == priority) | |
1520 | return 0; | |
1521 | ||
9da4cb2b LP |
1522 | if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { |
1523 | struct signal_data *old, *d; | |
1524 | ||
1525 | /* Move us from the signalfd belonging to the old | |
1526 | * priority to the signalfd of the new priority */ | |
1527 | ||
1528 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
1529 | ||
1530 | s->priority = priority; | |
1531 | ||
1532 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
1533 | if (r < 0) { | |
1534 | s->priority = old->priority; | |
1535 | return r; | |
1536 | } | |
1537 | ||
1538 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
1539 | } else | |
1540 | s->priority = priority; | |
fd38203a LP |
1541 | |
1542 | if (s->pending) | |
c2ba3ad6 | 1543 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1544 | |
1545 | if (s->prepare) | |
c2ba3ad6 | 1546 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1547 | |
6203e07a LP |
1548 | if (s->type == SOURCE_EXIT) |
1549 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1550 | |
fd38203a LP |
1551 | return 0; |
1552 | } | |
1553 | ||
f7262a9f | 1554 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1555 | assert_return(s, -EINVAL); |
1556 | assert_return(m, -EINVAL); | |
1557 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1558 | |
baf76283 | 1559 | *m = s->enabled; |
fd38203a LP |
1560 | return 0; |
1561 | } | |
1562 | ||
f7262a9f | 1563 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1564 | int r; |
1565 | ||
305f78bf LP |
1566 | assert_return(s, -EINVAL); |
1567 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
305f78bf | 1568 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1569 | |
cc567911 LP |
1570 | /* If we are dead anyway, we are fine with turning off |
1571 | * sources, but everything else needs to fail. */ | |
1572 | if (s->event->state == SD_EVENT_FINISHED) | |
1573 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1574 | ||
baf76283 | 1575 | if (s->enabled == m) |
fd38203a LP |
1576 | return 0; |
1577 | ||
baf76283 | 1578 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1579 | |
1580 | switch (s->type) { | |
1581 | ||
1582 | case SOURCE_IO: | |
366e6411 | 1583 | source_io_unregister(s); |
baf76283 | 1584 | s->enabled = m; |
fd38203a LP |
1585 | break; |
1586 | ||
6a0f1f6d | 1587 | case SOURCE_TIME_REALTIME: |
a8548816 | 1588 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1589 | case SOURCE_TIME_MONOTONIC: |
1590 | case SOURCE_TIME_REALTIME_ALARM: | |
1591 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1592 | struct clock_data *d; | |
fd38203a | 1593 | |
baf76283 | 1594 | s->enabled = m; |
6a0f1f6d LP |
1595 | d = event_get_clock_data(s->event, s->type); |
1596 | assert(d); | |
1597 | ||
1598 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1599 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1600 | d->needs_rearm = true; |
fd38203a | 1601 | break; |
6a0f1f6d | 1602 | } |
fd38203a LP |
1603 | |
1604 | case SOURCE_SIGNAL: | |
baf76283 | 1605 | s->enabled = m; |
4807d2d0 | 1606 | |
9da4cb2b | 1607 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
fd38203a LP |
1608 | break; |
1609 | ||
1610 | case SOURCE_CHILD: | |
baf76283 | 1611 | s->enabled = m; |
fd38203a | 1612 | |
baf76283 LP |
1613 | assert(s->event->n_enabled_child_sources > 0); |
1614 | s->event->n_enabled_child_sources--; | |
fd38203a | 1615 | |
9da4cb2b | 1616 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
fd38203a LP |
1617 | break; |
1618 | ||
6203e07a | 1619 | case SOURCE_EXIT: |
305f78bf | 1620 | s->enabled = m; |
6203e07a | 1621 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1622 | break; |
1623 | ||
1624 | case SOURCE_DEFER: | |
6e9feda3 | 1625 | case SOURCE_POST: |
baf76283 | 1626 | s->enabled = m; |
fd38203a | 1627 | break; |
9d3e3aa5 | 1628 | |
6a0f1f6d | 1629 | default: |
9d3e3aa5 | 1630 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1631 | } |
1632 | ||
1633 | } else { | |
1634 | switch (s->type) { | |
1635 | ||
1636 | case SOURCE_IO: | |
1637 | r = source_io_register(s, m, s->io.events); | |
1638 | if (r < 0) | |
1639 | return r; | |
1640 | ||
baf76283 | 1641 | s->enabled = m; |
fd38203a LP |
1642 | break; |
1643 | ||
6a0f1f6d | 1644 | case SOURCE_TIME_REALTIME: |
a8548816 | 1645 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1646 | case SOURCE_TIME_MONOTONIC: |
1647 | case SOURCE_TIME_REALTIME_ALARM: | |
1648 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1649 | struct clock_data *d; | |
fd38203a | 1650 | |
baf76283 | 1651 | s->enabled = m; |
6a0f1f6d LP |
1652 | d = event_get_clock_data(s->event, s->type); |
1653 | assert(d); | |
1654 | ||
1655 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1656 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1657 | d->needs_rearm = true; |
fd38203a | 1658 | break; |
6a0f1f6d | 1659 | } |
fd38203a LP |
1660 | |
1661 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1662 | |
1663 | s->enabled = m; | |
9da4cb2b LP |
1664 | |
1665 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
1666 | if (r < 0) { | |
1667 | s->enabled = SD_EVENT_OFF; | |
1668 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
1669 | return r; | |
1670 | } | |
1671 | ||
fd38203a LP |
1672 | break; |
1673 | ||
1674 | case SOURCE_CHILD: | |
4807d2d0 | 1675 | |
9da4cb2b | 1676 | if (s->enabled == SD_EVENT_OFF) |
4807d2d0 | 1677 | s->event->n_enabled_child_sources++; |
7a0d4a3d DH |
1678 | |
1679 | s->enabled = m; | |
9da4cb2b | 1680 | |
10edebf6 | 1681 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
9da4cb2b LP |
1682 | if (r < 0) { |
1683 | s->enabled = SD_EVENT_OFF; | |
1684 | s->event->n_enabled_child_sources--; | |
1685 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
1686 | return r; | |
1687 | } | |
1688 | ||
fd38203a LP |
1689 | break; |
1690 | ||
6203e07a | 1691 | case SOURCE_EXIT: |
305f78bf | 1692 | s->enabled = m; |
6203e07a | 1693 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1694 | break; |
1695 | ||
1696 | case SOURCE_DEFER: | |
6e9feda3 | 1697 | case SOURCE_POST: |
baf76283 | 1698 | s->enabled = m; |
fd38203a | 1699 | break; |
9d3e3aa5 | 1700 | |
6a0f1f6d | 1701 | default: |
9d3e3aa5 | 1702 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1703 | } |
1704 | } | |
1705 | ||
1706 | if (s->pending) | |
1707 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1708 | ||
1709 | if (s->prepare) | |
1710 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1711 | ||
1712 | return 0; | |
1713 | } | |
1714 | ||
f7262a9f | 1715 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1716 | assert_return(s, -EINVAL); |
1717 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1718 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1719 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1720 | |
1721 | *usec = s->time.next; | |
1722 | return 0; | |
1723 | } | |
1724 | ||
f7262a9f | 1725 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1726 | struct clock_data *d; |
1727 | ||
305f78bf LP |
1728 | assert_return(s, -EINVAL); |
1729 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1730 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1731 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1732 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1733 | |
fd38203a | 1734 | s->time.next = usec; |
2576a19e | 1735 | |
0cc1125a | 1736 | source_set_pending(s, false); |
fd38203a | 1737 | |
6a0f1f6d LP |
1738 | d = event_get_clock_data(s->event, s->type); |
1739 | assert(d); | |
1740 | ||
1741 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1742 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1743 | d->needs_rearm = true; |
fd38203a LP |
1744 | |
1745 | return 0; | |
1746 | } | |
1747 | ||
f7262a9f | 1748 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1749 | assert_return(s, -EINVAL); |
1750 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1751 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1752 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1753 | ||
1754 | *usec = s->time.accuracy; | |
1755 | return 0; | |
1756 | } | |
1757 | ||
f7262a9f | 1758 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1759 | struct clock_data *d; |
1760 | ||
305f78bf LP |
1761 | assert_return(s, -EINVAL); |
1762 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1763 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1764 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1765 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1766 | |
1767 | if (usec == 0) | |
1768 | usec = DEFAULT_ACCURACY_USEC; | |
1769 | ||
eaa3cbef LP |
1770 | s->time.accuracy = usec; |
1771 | ||
2576a19e LP |
1772 | source_set_pending(s, false); |
1773 | ||
6a0f1f6d LP |
1774 | d = event_get_clock_data(s->event, s->type); |
1775 | assert(d); | |
1776 | ||
1777 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1778 | d->needs_rearm = true; |
6a0f1f6d LP |
1779 | |
1780 | return 0; | |
1781 | } | |
1782 | ||
1783 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1784 | assert_return(s, -EINVAL); | |
1785 | assert_return(clock, -EINVAL); | |
1786 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1787 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1788 | |
6a0f1f6d | 1789 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1790 | return 0; |
1791 | } | |
1792 | ||
f7262a9f | 1793 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1794 | assert_return(s, -EINVAL); |
1795 | assert_return(pid, -EINVAL); | |
1796 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1797 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1798 | ||
1799 | *pid = s->child.pid; | |
1800 | return 0; | |
1801 | } | |
1802 | ||
718db961 | 1803 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1804 | int r; |
1805 | ||
da7e457c | 1806 | assert_return(s, -EINVAL); |
6203e07a | 1807 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1808 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1809 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1810 | |
1811 | if (s->prepare == callback) | |
1812 | return 0; | |
1813 | ||
1814 | if (callback && s->prepare) { | |
1815 | s->prepare = callback; | |
1816 | return 0; | |
1817 | } | |
1818 | ||
1819 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1820 | if (r < 0) | |
1821 | return r; | |
1822 | ||
1823 | s->prepare = callback; | |
1824 | ||
1825 | if (callback) { | |
1826 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1827 | if (r < 0) | |
1828 | return r; | |
1829 | } else | |
1830 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1831 | ||
1832 | return 0; | |
1833 | } | |
1834 | ||
f7262a9f | 1835 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1836 | assert_return(s, NULL); |
fd38203a LP |
1837 | |
1838 | return s->userdata; | |
1839 | } | |
1840 | ||
8f726607 LP |
1841 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1842 | void *ret; | |
1843 | ||
1844 | assert_return(s, NULL); | |
1845 | ||
1846 | ret = s->userdata; | |
1847 | s->userdata = userdata; | |
1848 | ||
1849 | return ret; | |
1850 | } | |
1851 | ||
c2ba3ad6 LP |
1852 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1853 | usec_t c; | |
1854 | assert(e); | |
1855 | assert(a <= b); | |
1856 | ||
1857 | if (a <= 0) | |
1858 | return 0; | |
1859 | ||
1860 | if (b <= a + 1) | |
1861 | return a; | |
1862 | ||
52444dc4 LP |
1863 | initialize_perturb(e); |
1864 | ||
c2ba3ad6 LP |
1865 | /* |
1866 | Find a good time to wake up again between times a and b. We | |
1867 | have two goals here: | |
1868 | ||
1869 | a) We want to wake up as seldom as possible, hence prefer | |
1870 | later times over earlier times. | |
1871 | ||
1872 | b) But if we have to wake up, then let's make sure to | |
1873 | dispatch as much as possible on the entire system. | |
1874 | ||
1875 | We implement this by waking up everywhere at the same time | |
850516e0 | 1876 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1877 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1878 | then we try to find the same spot in every 10s, then 1s and |
1879 | then 250ms step. Otherwise, we pick the last possible time | |
1880 | to wake up. | |
c2ba3ad6 LP |
1881 | */ |
1882 | ||
850516e0 LP |
1883 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1884 | if (c >= b) { | |
1885 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1886 | return b; | |
1887 | ||
1888 | c -= USEC_PER_MINUTE; | |
1889 | } | |
1890 | ||
ba276c81 LP |
1891 | if (c >= a) |
1892 | return c; | |
1893 | ||
1894 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1895 | if (c >= b) { | |
1896 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1897 | return b; | |
1898 | ||
1899 | c -= USEC_PER_SEC*10; | |
1900 | } | |
1901 | ||
850516e0 LP |
1902 | if (c >= a) |
1903 | return c; | |
1904 | ||
1905 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1906 | if (c >= b) { |
1907 | if (_unlikely_(c < USEC_PER_SEC)) | |
1908 | return b; | |
1909 | ||
1910 | c -= USEC_PER_SEC; | |
1911 | } | |
1912 | ||
1913 | if (c >= a) | |
1914 | return c; | |
1915 | ||
1916 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1917 | if (c >= b) { | |
1918 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1919 | return b; | |
1920 | ||
1921 | c -= USEC_PER_MSEC*250; | |
1922 | } | |
1923 | ||
1924 | if (c >= a) | |
1925 | return c; | |
1926 | ||
1927 | return b; | |
1928 | } | |
1929 | ||
fd38203a LP |
1930 | static int event_arm_timer( |
1931 | sd_event *e, | |
6a0f1f6d | 1932 | struct clock_data *d) { |
fd38203a LP |
1933 | |
1934 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1935 | sd_event_source *a, *b; |
1936 | usec_t t; | |
fd38203a LP |
1937 | int r; |
1938 | ||
cde93897 | 1939 | assert(e); |
6a0f1f6d | 1940 | assert(d); |
fd38203a | 1941 | |
d06441da | 1942 | if (!d->needs_rearm) |
212bbb17 TG |
1943 | return 0; |
1944 | else | |
1945 | d->needs_rearm = false; | |
1946 | ||
6a0f1f6d | 1947 | a = prioq_peek(d->earliest); |
72aedc1e LP |
1948 | if (!a || a->enabled == SD_EVENT_OFF) { |
1949 | ||
6a0f1f6d | 1950 | if (d->fd < 0) |
c57b5ca3 LP |
1951 | return 0; |
1952 | ||
3a43da28 | 1953 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
1954 | return 0; |
1955 | ||
1956 | /* disarm */ | |
6a0f1f6d | 1957 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1958 | if (r < 0) |
1959 | return r; | |
1960 | ||
3a43da28 | 1961 | d->next = USEC_INFINITY; |
fd38203a | 1962 | return 0; |
72aedc1e | 1963 | } |
fd38203a | 1964 | |
6a0f1f6d | 1965 | b = prioq_peek(d->latest); |
baf76283 | 1966 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1967 | |
1968 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
6a0f1f6d | 1969 | if (d->next == t) |
fd38203a LP |
1970 | return 0; |
1971 | ||
6a0f1f6d | 1972 | assert_se(d->fd >= 0); |
fd38203a | 1973 | |
c2ba3ad6 | 1974 | if (t == 0) { |
fd38203a LP |
1975 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1976 | its.it_value.tv_sec = 0; | |
1977 | its.it_value.tv_nsec = 1; | |
1978 | } else | |
c2ba3ad6 | 1979 | timespec_store(&its.it_value, t); |
fd38203a | 1980 | |
6a0f1f6d | 1981 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 1982 | if (r < 0) |
cde93897 | 1983 | return -errno; |
fd38203a | 1984 | |
6a0f1f6d | 1985 | d->next = t; |
fd38203a LP |
1986 | return 0; |
1987 | } | |
1988 | ||
9a800b56 | 1989 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
1990 | assert(e); |
1991 | assert(s); | |
1992 | assert(s->type == SOURCE_IO); | |
1993 | ||
9a800b56 LP |
1994 | /* If the event source was already pending, we just OR in the |
1995 | * new revents, otherwise we reset the value. The ORing is | |
1996 | * necessary to handle EPOLLONESHOT events properly where | |
1997 | * readability might happen independently of writability, and | |
1998 | * we need to keep track of both */ | |
1999 | ||
2000 | if (s->pending) | |
2001 | s->io.revents |= revents; | |
2002 | else | |
2003 | s->io.revents = revents; | |
fd38203a | 2004 | |
fd38203a LP |
2005 | return source_set_pending(s, true); |
2006 | } | |
2007 | ||
72aedc1e | 2008 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2009 | uint64_t x; |
2010 | ssize_t ss; | |
2011 | ||
2012 | assert(e); | |
da7e457c | 2013 | assert(fd >= 0); |
72aedc1e | 2014 | |
305f78bf | 2015 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2016 | |
2017 | ss = read(fd, &x, sizeof(x)); | |
2018 | if (ss < 0) { | |
2019 | if (errno == EAGAIN || errno == EINTR) | |
2020 | return 0; | |
2021 | ||
2022 | return -errno; | |
2023 | } | |
2024 | ||
8d35dae7 | 2025 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2026 | return -EIO; |
2027 | ||
cde93897 | 2028 | if (next) |
3a43da28 | 2029 | *next = USEC_INFINITY; |
72aedc1e | 2030 | |
fd38203a LP |
2031 | return 0; |
2032 | } | |
2033 | ||
305f78bf LP |
2034 | static int process_timer( |
2035 | sd_event *e, | |
2036 | usec_t n, | |
6a0f1f6d | 2037 | struct clock_data *d) { |
305f78bf | 2038 | |
fd38203a LP |
2039 | sd_event_source *s; |
2040 | int r; | |
2041 | ||
2042 | assert(e); | |
6a0f1f6d | 2043 | assert(d); |
fd38203a LP |
2044 | |
2045 | for (;;) { | |
6a0f1f6d | 2046 | s = prioq_peek(d->earliest); |
fd38203a LP |
2047 | if (!s || |
2048 | s->time.next > n || | |
baf76283 | 2049 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2050 | s->pending) |
2051 | break; | |
2052 | ||
2053 | r = source_set_pending(s, true); | |
2054 | if (r < 0) | |
2055 | return r; | |
2056 | ||
6a0f1f6d LP |
2057 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2058 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 2059 | d->needs_rearm = true; |
fd38203a LP |
2060 | } |
2061 | ||
2062 | return 0; | |
2063 | } | |
2064 | ||
2065 | static int process_child(sd_event *e) { | |
2066 | sd_event_source *s; | |
2067 | Iterator i; | |
2068 | int r; | |
2069 | ||
2070 | assert(e); | |
2071 | ||
c2ba3ad6 LP |
2072 | e->need_process_child = false; |
2073 | ||
fd38203a LP |
2074 | /* |
2075 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2076 | + WNOHANG for each PID we wait for, instead of using | |
2077 | P_ALL. This is because we only want to get child | |
2078 | information of very specific child processes, and not all | |
2079 | of them. We might not have processed the SIGCHLD even of a | |
2080 | previous invocation and we don't want to maintain a | |
2081 | unbounded *per-child* event queue, hence we really don't | |
2082 | want anything flushed out of the kernel's queue that we | |
2083 | don't care about. Since this is O(n) this means that if you | |
2084 | have a lot of processes you probably want to handle SIGCHLD | |
2085 | yourself. | |
08cd1552 LP |
2086 | |
2087 | We do not reap the children here (by using WNOWAIT), this | |
2088 | is only done after the event source is dispatched so that | |
2089 | the callback still sees the process as a zombie. | |
fd38203a LP |
2090 | */ |
2091 | ||
2092 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2093 | assert(s->type == SOURCE_CHILD); | |
2094 | ||
2095 | if (s->pending) | |
2096 | continue; | |
2097 | ||
baf76283 | 2098 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2099 | continue; |
2100 | ||
2101 | zero(s->child.siginfo); | |
08cd1552 LP |
2102 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2103 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
2104 | if (r < 0) |
2105 | return -errno; | |
2106 | ||
2107 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
2108 | bool zombie = |
2109 | s->child.siginfo.si_code == CLD_EXITED || | |
2110 | s->child.siginfo.si_code == CLD_KILLED || | |
2111 | s->child.siginfo.si_code == CLD_DUMPED; | |
2112 | ||
2113 | if (!zombie && (s->child.options & WEXITED)) { | |
2114 | /* If the child isn't dead then let's | |
2115 | * immediately remove the state change | |
2116 | * from the queue, since there's no | |
2117 | * benefit in leaving it queued */ | |
2118 | ||
2119 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2120 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2121 | } | |
2122 | ||
fd38203a LP |
2123 | r = source_set_pending(s, true); |
2124 | if (r < 0) | |
2125 | return r; | |
2126 | } | |
2127 | } | |
2128 | ||
fd38203a LP |
2129 | return 0; |
2130 | } | |
2131 | ||
9da4cb2b | 2132 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2133 | bool read_one = false; |
fd38203a LP |
2134 | int r; |
2135 | ||
da7e457c | 2136 | assert(e); |
305f78bf | 2137 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2138 | |
9da4cb2b LP |
2139 | /* If there's a signal queued on this priority and SIGCHLD is |
2140 | on this priority too, then make sure to recheck the | |
2141 | children we watch. This is because we only ever dequeue | |
2142 | the first signal per priority, and if we dequeue one, and | |
2143 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2144 | might have higher priority children we care about hence we | |
2145 | need to check that explicitly. */ | |
2146 | ||
2147 | if (sigismember(&d->sigset, SIGCHLD)) | |
2148 | e->need_process_child = true; | |
2149 | ||
2150 | /* If there's already an event source pending for this | |
2151 | * priority we don't read another */ | |
2152 | if (d->current) | |
2153 | return 0; | |
2154 | ||
fd38203a | 2155 | for (;;) { |
0eb2e0e3 | 2156 | struct signalfd_siginfo si; |
7057bd99 | 2157 | ssize_t n; |
92daebc0 | 2158 | sd_event_source *s = NULL; |
fd38203a | 2159 | |
9da4cb2b | 2160 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 2161 | if (n < 0) { |
fd38203a LP |
2162 | if (errno == EAGAIN || errno == EINTR) |
2163 | return read_one; | |
2164 | ||
2165 | return -errno; | |
2166 | } | |
2167 | ||
7057bd99 | 2168 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2169 | return -EIO; |
2170 | ||
7057bd99 ZJS |
2171 | assert(si.ssi_signo < _NSIG); |
2172 | ||
fd38203a LP |
2173 | read_one = true; |
2174 | ||
92daebc0 LP |
2175 | if (e->signal_sources) |
2176 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
2177 | if (!s) |
2178 | continue; | |
9da4cb2b LP |
2179 | if (s->pending) |
2180 | continue; | |
fd38203a LP |
2181 | |
2182 | s->signal.siginfo = si; | |
9da4cb2b LP |
2183 | d->current = s; |
2184 | ||
fd38203a LP |
2185 | r = source_set_pending(s, true); |
2186 | if (r < 0) | |
2187 | return r; | |
9da4cb2b LP |
2188 | |
2189 | return 1; | |
fd38203a | 2190 | } |
fd38203a LP |
2191 | } |
2192 | ||
2193 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 2194 | int r = 0; |
fd38203a LP |
2195 | |
2196 | assert(s); | |
6203e07a | 2197 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2198 | |
6203e07a | 2199 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
2200 | r = source_set_pending(s, false); |
2201 | if (r < 0) | |
2202 | return r; | |
2203 | } | |
fd38203a | 2204 | |
6e9feda3 LP |
2205 | if (s->type != SOURCE_POST) { |
2206 | sd_event_source *z; | |
2207 | Iterator i; | |
2208 | ||
2209 | /* If we execute a non-post source, let's mark all | |
2210 | * post sources as pending */ | |
2211 | ||
2212 | SET_FOREACH(z, s->event->post_sources, i) { | |
2213 | if (z->enabled == SD_EVENT_OFF) | |
2214 | continue; | |
2215 | ||
2216 | r = source_set_pending(z, true); | |
2217 | if (r < 0) | |
2218 | return r; | |
2219 | } | |
2220 | } | |
2221 | ||
baf76283 LP |
2222 | if (s->enabled == SD_EVENT_ONESHOT) { |
2223 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2224 | if (r < 0) |
2225 | return r; | |
2226 | } | |
2227 | ||
12179984 | 2228 | s->dispatching = true; |
b7484e2a | 2229 | |
fd38203a LP |
2230 | switch (s->type) { |
2231 | ||
2232 | case SOURCE_IO: | |
2233 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2234 | break; | |
2235 | ||
6a0f1f6d | 2236 | case SOURCE_TIME_REALTIME: |
a8548816 | 2237 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2238 | case SOURCE_TIME_MONOTONIC: |
2239 | case SOURCE_TIME_REALTIME_ALARM: | |
2240 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2241 | r = s->time.callback(s, s->time.next, s->userdata); |
2242 | break; | |
2243 | ||
2244 | case SOURCE_SIGNAL: | |
2245 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2246 | break; | |
2247 | ||
08cd1552 LP |
2248 | case SOURCE_CHILD: { |
2249 | bool zombie; | |
2250 | ||
2251 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
2252 | s->child.siginfo.si_code == CLD_KILLED || | |
2253 | s->child.siginfo.si_code == CLD_DUMPED; | |
2254 | ||
fd38203a | 2255 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2256 | |
2257 | /* Now, reap the PID for good. */ | |
2258 | if (zombie) | |
2259 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2260 | ||
fd38203a | 2261 | break; |
08cd1552 | 2262 | } |
fd38203a LP |
2263 | |
2264 | case SOURCE_DEFER: | |
2265 | r = s->defer.callback(s, s->userdata); | |
2266 | break; | |
da7e457c | 2267 | |
6e9feda3 LP |
2268 | case SOURCE_POST: |
2269 | r = s->post.callback(s, s->userdata); | |
2270 | break; | |
2271 | ||
6203e07a LP |
2272 | case SOURCE_EXIT: |
2273 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2274 | break; |
9d3e3aa5 LP |
2275 | |
2276 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2277 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2278 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2279 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2280 | } |
2281 | ||
12179984 LP |
2282 | s->dispatching = false; |
2283 | ||
752bbf75 | 2284 | if (r < 0) { |
356779df | 2285 | if (s->description) |
da927ba9 | 2286 | log_debug_errno(r, "Event source '%s' returned error, disabling: %m", s->description); |
752bbf75 | 2287 | else |
da927ba9 | 2288 | log_debug_errno(r, "Event source %p returned error, disabling: %m", s); |
752bbf75 | 2289 | } |
12179984 LP |
2290 | |
2291 | if (s->n_ref == 0) | |
2292 | source_free(s); | |
2293 | else if (r < 0) | |
6203e07a | 2294 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2295 | |
6203e07a | 2296 | return 1; |
fd38203a LP |
2297 | } |
2298 | ||
2299 | static int event_prepare(sd_event *e) { | |
2300 | int r; | |
2301 | ||
2302 | assert(e); | |
2303 | ||
2304 | for (;;) { | |
2305 | sd_event_source *s; | |
2306 | ||
2307 | s = prioq_peek(e->prepare); | |
baf76283 | 2308 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2309 | break; |
2310 | ||
2311 | s->prepare_iteration = e->iteration; | |
2312 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2313 | if (r < 0) | |
2314 | return r; | |
2315 | ||
2316 | assert(s->prepare); | |
12179984 LP |
2317 | |
2318 | s->dispatching = true; | |
fd38203a | 2319 | r = s->prepare(s, s->userdata); |
12179984 LP |
2320 | s->dispatching = false; |
2321 | ||
752bbf75 | 2322 | if (r < 0) { |
356779df | 2323 | if (s->description) |
da927ba9 | 2324 | log_debug_errno(r, "Prepare callback of event source '%s' returned error, disabling: %m", s->description); |
752bbf75 | 2325 | else |
da927ba9 | 2326 | log_debug_errno(r, "Prepare callback of event source %p returned error, disabling: %m", s); |
752bbf75 | 2327 | } |
fd38203a | 2328 | |
12179984 LP |
2329 | if (s->n_ref == 0) |
2330 | source_free(s); | |
2331 | else if (r < 0) | |
2332 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2333 | } |
2334 | ||
2335 | return 0; | |
2336 | } | |
2337 | ||
6203e07a | 2338 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2339 | sd_event_source *p; |
2340 | int r; | |
2341 | ||
2342 | assert(e); | |
2343 | ||
6203e07a | 2344 | p = prioq_peek(e->exit); |
baf76283 | 2345 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2346 | e->state = SD_EVENT_FINISHED; |
2347 | return 0; | |
2348 | } | |
2349 | ||
2350 | sd_event_ref(e); | |
2351 | e->iteration++; | |
6203e07a | 2352 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2353 | |
2354 | r = source_dispatch(p); | |
2355 | ||
2b0c9ef7 | 2356 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2357 | sd_event_unref(e); |
2358 | ||
2359 | return r; | |
2360 | } | |
2361 | ||
c2ba3ad6 LP |
2362 | static sd_event_source* event_next_pending(sd_event *e) { |
2363 | sd_event_source *p; | |
2364 | ||
da7e457c LP |
2365 | assert(e); |
2366 | ||
c2ba3ad6 LP |
2367 | p = prioq_peek(e->pending); |
2368 | if (!p) | |
2369 | return NULL; | |
2370 | ||
baf76283 | 2371 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2372 | return NULL; |
2373 | ||
2374 | return p; | |
2375 | } | |
2376 | ||
cde93897 LP |
2377 | static int arm_watchdog(sd_event *e) { |
2378 | struct itimerspec its = {}; | |
2379 | usec_t t; | |
2380 | int r; | |
2381 | ||
2382 | assert(e); | |
2383 | assert(e->watchdog_fd >= 0); | |
2384 | ||
2385 | t = sleep_between(e, | |
2386 | e->watchdog_last + (e->watchdog_period / 2), | |
2387 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2388 | ||
2389 | timespec_store(&its.it_value, t); | |
2390 | ||
75145780 LP |
2391 | /* Make sure we never set the watchdog to 0, which tells the |
2392 | * kernel to disable it. */ | |
2393 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2394 | its.it_value.tv_nsec = 1; | |
2395 | ||
cde93897 LP |
2396 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2397 | if (r < 0) | |
2398 | return -errno; | |
2399 | ||
2400 | return 0; | |
2401 | } | |
2402 | ||
2403 | static int process_watchdog(sd_event *e) { | |
2404 | assert(e); | |
2405 | ||
2406 | if (!e->watchdog) | |
2407 | return 0; | |
2408 | ||
2409 | /* Don't notify watchdog too often */ | |
2410 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2411 | return 0; | |
2412 | ||
2413 | sd_notify(false, "WATCHDOG=1"); | |
2414 | e->watchdog_last = e->timestamp.monotonic; | |
2415 | ||
2416 | return arm_watchdog(e); | |
2417 | } | |
2418 | ||
c45a5a74 TG |
2419 | _public_ int sd_event_prepare(sd_event *e) { |
2420 | int r; | |
fd38203a | 2421 | |
da7e457c LP |
2422 | assert_return(e, -EINVAL); |
2423 | assert_return(!event_pid_changed(e), -ECHILD); | |
2424 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2425 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 2426 | |
6203e07a | 2427 | if (e->exit_requested) |
c45a5a74 | 2428 | goto pending; |
fd38203a LP |
2429 | |
2430 | e->iteration++; | |
2431 | ||
2432 | r = event_prepare(e); | |
2433 | if (r < 0) | |
c45a5a74 | 2434 | return r; |
fd38203a | 2435 | |
6a0f1f6d LP |
2436 | r = event_arm_timer(e, &e->realtime); |
2437 | if (r < 0) | |
c45a5a74 | 2438 | return r; |
6a0f1f6d | 2439 | |
a8548816 TG |
2440 | r = event_arm_timer(e, &e->boottime); |
2441 | if (r < 0) | |
c45a5a74 | 2442 | return r; |
a8548816 | 2443 | |
6a0f1f6d LP |
2444 | r = event_arm_timer(e, &e->monotonic); |
2445 | if (r < 0) | |
c45a5a74 | 2446 | return r; |
6a0f1f6d LP |
2447 | |
2448 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 2449 | if (r < 0) |
c45a5a74 | 2450 | return r; |
fd38203a | 2451 | |
6a0f1f6d | 2452 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 2453 | if (r < 0) |
c45a5a74 | 2454 | return r; |
fd38203a | 2455 | |
1b5995b0 | 2456 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
2457 | goto pending; |
2458 | ||
2b0c9ef7 | 2459 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
2460 | |
2461 | return 0; | |
2462 | ||
2463 | pending: | |
2b0c9ef7 | 2464 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2465 | r = sd_event_wait(e, 0); |
2466 | if (r == 0) | |
2b0c9ef7 | 2467 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2468 | |
2469 | return r; | |
c45a5a74 TG |
2470 | } |
2471 | ||
2472 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2473 | struct epoll_event *ev_queue; | |
2474 | unsigned ev_queue_max; | |
2475 | int r, m, i; | |
2476 | ||
2477 | assert_return(e, -EINVAL); | |
2478 | assert_return(!event_pid_changed(e), -ECHILD); | |
2479 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2480 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
2481 | |
2482 | if (e->exit_requested) { | |
2483 | e->state = SD_EVENT_PENDING; | |
2484 | return 1; | |
2485 | } | |
6a0f1f6d | 2486 | |
1c724e9e | 2487 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 2488 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 2489 | |
15b38f93 | 2490 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2491 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2492 | if (m < 0) { |
c45a5a74 TG |
2493 | if (errno == EINTR) { |
2494 | e->state = SD_EVENT_PENDING; | |
2495 | return 1; | |
2496 | } | |
2497 | ||
2498 | r = -errno; | |
da7e457c LP |
2499 | goto finish; |
2500 | } | |
fd38203a | 2501 | |
46e8c825 | 2502 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2503 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2504 | |
2505 | for (i = 0; i < m; i++) { | |
2506 | ||
9da4cb2b | 2507 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2508 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
9da4cb2b LP |
2509 | else { |
2510 | WakeupType *t = ev_queue[i].data.ptr; | |
2511 | ||
2512 | switch (*t) { | |
2513 | ||
2514 | case WAKEUP_EVENT_SOURCE: | |
2515 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2516 | break; | |
fd38203a | 2517 | |
9da4cb2b LP |
2518 | case WAKEUP_CLOCK_DATA: { |
2519 | struct clock_data *d = ev_queue[i].data.ptr; | |
2520 | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); | |
2521 | break; | |
2522 | } | |
2523 | ||
2524 | case WAKEUP_SIGNAL_DATA: | |
2525 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2526 | break; | |
2527 | ||
2528 | default: | |
2529 | assert_not_reached("Invalid wake-up pointer"); | |
2530 | } | |
2531 | } | |
fd38203a | 2532 | if (r < 0) |
da7e457c | 2533 | goto finish; |
fd38203a LP |
2534 | } |
2535 | ||
cde93897 LP |
2536 | r = process_watchdog(e); |
2537 | if (r < 0) | |
2538 | goto finish; | |
2539 | ||
6a0f1f6d LP |
2540 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2541 | if (r < 0) | |
2542 | goto finish; | |
2543 | ||
a8548816 TG |
2544 | r = process_timer(e, e->timestamp_boottime, &e->boottime); |
2545 | if (r < 0) | |
2546 | goto finish; | |
2547 | ||
6a0f1f6d LP |
2548 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2549 | if (r < 0) | |
2550 | goto finish; | |
2551 | ||
2552 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2553 | if (r < 0) |
da7e457c | 2554 | goto finish; |
fd38203a | 2555 | |
6a0f1f6d | 2556 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2557 | if (r < 0) |
da7e457c | 2558 | goto finish; |
fd38203a | 2559 | |
c2ba3ad6 | 2560 | if (e->need_process_child) { |
fd38203a LP |
2561 | r = process_child(e); |
2562 | if (r < 0) | |
da7e457c | 2563 | goto finish; |
fd38203a LP |
2564 | } |
2565 | ||
c45a5a74 TG |
2566 | if (event_next_pending(e)) { |
2567 | e->state = SD_EVENT_PENDING; | |
2568 | ||
2569 | return 1; | |
da7e457c LP |
2570 | } |
2571 | ||
c45a5a74 | 2572 | r = 0; |
fd38203a | 2573 | |
da7e457c | 2574 | finish: |
2b0c9ef7 | 2575 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2576 | |
2577 | return r; | |
fd38203a LP |
2578 | } |
2579 | ||
c45a5a74 TG |
2580 | _public_ int sd_event_dispatch(sd_event *e) { |
2581 | sd_event_source *p; | |
2582 | int r; | |
2583 | ||
2584 | assert_return(e, -EINVAL); | |
2585 | assert_return(!event_pid_changed(e), -ECHILD); | |
2586 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2587 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
2588 | ||
2589 | if (e->exit_requested) | |
2590 | return dispatch_exit(e); | |
2591 | ||
2592 | p = event_next_pending(e); | |
2593 | if (p) { | |
2594 | sd_event_ref(e); | |
2595 | ||
2596 | e->state = SD_EVENT_RUNNING; | |
2597 | r = source_dispatch(p); | |
2b0c9ef7 | 2598 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2599 | |
2600 | sd_event_unref(e); | |
2601 | ||
2602 | return r; | |
2603 | } | |
2604 | ||
2b0c9ef7 | 2605 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2606 | |
2607 | return 1; | |
2608 | } | |
2609 | ||
2610 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { | |
2611 | int r; | |
2612 | ||
2613 | assert_return(e, -EINVAL); | |
2614 | assert_return(!event_pid_changed(e), -ECHILD); | |
2615 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2616 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 TG |
2617 | |
2618 | r = sd_event_prepare(e); | |
53bac4e0 LP |
2619 | if (r == 0) |
2620 | /* There was nothing? Then wait... */ | |
2621 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 2622 | |
02d30981 | 2623 | if (r > 0) { |
53bac4e0 | 2624 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
2625 | r = sd_event_dispatch(e); |
2626 | if (r < 0) | |
2627 | return r; | |
53bac4e0 LP |
2628 | |
2629 | return 1; | |
2630 | } | |
2631 | ||
2632 | return r; | |
c45a5a74 TG |
2633 | } |
2634 | ||
f7262a9f | 2635 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2636 | int r; |
2637 | ||
da7e457c LP |
2638 | assert_return(e, -EINVAL); |
2639 | assert_return(!event_pid_changed(e), -ECHILD); | |
2b0c9ef7 | 2640 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c LP |
2641 | |
2642 | sd_event_ref(e); | |
fd38203a | 2643 | |
da7e457c | 2644 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2645 | r = sd_event_run(e, (uint64_t) -1); |
2646 | if (r < 0) | |
da7e457c | 2647 | goto finish; |
fd38203a LP |
2648 | } |
2649 | ||
6203e07a | 2650 | r = e->exit_code; |
da7e457c LP |
2651 | |
2652 | finish: | |
2653 | sd_event_unref(e); | |
2654 | return r; | |
fd38203a LP |
2655 | } |
2656 | ||
9b364545 TG |
2657 | _public_ int sd_event_get_fd(sd_event *e) { |
2658 | ||
2659 | assert_return(e, -EINVAL); | |
2660 | assert_return(!event_pid_changed(e), -ECHILD); | |
2661 | ||
2662 | return e->epoll_fd; | |
2663 | } | |
2664 | ||
f7262a9f | 2665 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2666 | assert_return(e, -EINVAL); |
2667 | assert_return(!event_pid_changed(e), -ECHILD); | |
2668 | ||
2669 | return e->state; | |
2670 | } | |
2671 | ||
6203e07a | 2672 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2673 | assert_return(e, -EINVAL); |
6203e07a | 2674 | assert_return(code, -EINVAL); |
da7e457c | 2675 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2676 | |
6203e07a LP |
2677 | if (!e->exit_requested) |
2678 | return -ENODATA; | |
2679 | ||
2680 | *code = e->exit_code; | |
2681 | return 0; | |
fd38203a LP |
2682 | } |
2683 | ||
6203e07a | 2684 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2685 | assert_return(e, -EINVAL); |
2686 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2687 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2688 | |
6203e07a LP |
2689 | e->exit_requested = true; |
2690 | e->exit_code = code; | |
2691 | ||
fd38203a LP |
2692 | return 0; |
2693 | } | |
46e8c825 | 2694 | |
6a0f1f6d | 2695 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2696 | assert_return(e, -EINVAL); |
2697 | assert_return(usec, -EINVAL); | |
46e8c825 LP |
2698 | assert_return(!event_pid_changed(e), -ECHILD); |
2699 | ||
38a03f06 LP |
2700 | if (!dual_timestamp_is_set(&e->timestamp)) { |
2701 | /* Implicitly fall back to now() if we never ran | |
2702 | * before and thus have no cached time. */ | |
2703 | *usec = now(clock); | |
2704 | return 1; | |
2705 | } | |
46e8c825 | 2706 | |
6a0f1f6d LP |
2707 | switch (clock) { |
2708 | ||
2709 | case CLOCK_REALTIME: | |
2710 | case CLOCK_REALTIME_ALARM: | |
2711 | *usec = e->timestamp.realtime; | |
2712 | break; | |
2713 | ||
2714 | case CLOCK_MONOTONIC: | |
2715 | *usec = e->timestamp.monotonic; | |
2716 | break; | |
2717 | ||
a8548816 | 2718 | case CLOCK_BOOTTIME: |
6a0f1f6d LP |
2719 | case CLOCK_BOOTTIME_ALARM: |
2720 | *usec = e->timestamp_boottime; | |
2721 | break; | |
2722 | } | |
46e8c825 | 2723 | |
46e8c825 LP |
2724 | return 0; |
2725 | } | |
afc6adb5 LP |
2726 | |
2727 | _public_ int sd_event_default(sd_event **ret) { | |
2728 | ||
ec202eae | 2729 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2730 | sd_event *e = NULL; |
afc6adb5 LP |
2731 | int r; |
2732 | ||
2733 | if (!ret) | |
2734 | return !!default_event; | |
2735 | ||
2736 | if (default_event) { | |
2737 | *ret = sd_event_ref(default_event); | |
2738 | return 0; | |
2739 | } | |
2740 | ||
2741 | r = sd_event_new(&e); | |
2742 | if (r < 0) | |
2743 | return r; | |
2744 | ||
2745 | e->default_event_ptr = &default_event; | |
2746 | e->tid = gettid(); | |
2747 | default_event = e; | |
2748 | ||
2749 | *ret = e; | |
2750 | return 1; | |
2751 | } | |
2752 | ||
2753 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2754 | assert_return(e, -EINVAL); | |
2755 | assert_return(tid, -EINVAL); | |
76b54375 | 2756 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2757 | |
76b54375 LP |
2758 | if (e->tid != 0) { |
2759 | *tid = e->tid; | |
2760 | return 0; | |
2761 | } | |
2762 | ||
2763 | return -ENXIO; | |
afc6adb5 | 2764 | } |
cde93897 LP |
2765 | |
2766 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2767 | int r; | |
2768 | ||
2769 | assert_return(e, -EINVAL); | |
8f726607 | 2770 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2771 | |
2772 | if (e->watchdog == !!b) | |
2773 | return e->watchdog; | |
2774 | ||
2775 | if (b) { | |
2776 | struct epoll_event ev = {}; | |
cde93897 | 2777 | |
09812eb7 LP |
2778 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2779 | if (r <= 0) | |
cde93897 | 2780 | return r; |
cde93897 LP |
2781 | |
2782 | /* Issue first ping immediately */ | |
2783 | sd_notify(false, "WATCHDOG=1"); | |
2784 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2785 | ||
2786 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2787 | if (e->watchdog_fd < 0) | |
2788 | return -errno; | |
2789 | ||
2790 | r = arm_watchdog(e); | |
2791 | if (r < 0) | |
2792 | goto fail; | |
2793 | ||
2794 | ev.events = EPOLLIN; | |
2795 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2796 | ||
2797 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2798 | if (r < 0) { | |
2799 | r = -errno; | |
2800 | goto fail; | |
2801 | } | |
2802 | ||
2803 | } else { | |
2804 | if (e->watchdog_fd >= 0) { | |
2805 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2806 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2807 | } |
2808 | } | |
2809 | ||
2810 | e->watchdog = !!b; | |
2811 | return e->watchdog; | |
2812 | ||
2813 | fail: | |
03e334a1 | 2814 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2815 | return r; |
2816 | } | |
8f726607 LP |
2817 | |
2818 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2819 | assert_return(e, -EINVAL); | |
2820 | assert_return(!event_pid_changed(e), -ECHILD); | |
2821 | ||
2822 | return e->watchdog; | |
2823 | } |