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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 | ||
cde93897 | 26 | #include "sd-daemon.h" |
07630cea LP |
27 | #include "sd-event.h" |
28 | #include "sd-id128.h" | |
29 | ||
b5efdb8a | 30 | #include "alloc-util.h" |
3ffd4af2 | 31 | #include "fd-util.h" |
fd38203a | 32 | #include "hashmap.h" |
07630cea LP |
33 | #include "list.h" |
34 | #include "macro.h" | |
afc6adb5 | 35 | #include "missing.h" |
07630cea | 36 | #include "prioq.h" |
4a0b58c4 | 37 | #include "process-util.h" |
6e9feda3 | 38 | #include "set.h" |
24882e06 | 39 | #include "signal-util.h" |
07630cea LP |
40 | #include "string-util.h" |
41 | #include "time-util.h" | |
42 | #include "util.h" | |
fd38203a | 43 | |
c2ba3ad6 | 44 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
45 | |
46 | typedef enum EventSourceType { | |
47 | SOURCE_IO, | |
6a0f1f6d | 48 | SOURCE_TIME_REALTIME, |
a8548816 | 49 | SOURCE_TIME_BOOTTIME, |
6a0f1f6d LP |
50 | SOURCE_TIME_MONOTONIC, |
51 | SOURCE_TIME_REALTIME_ALARM, | |
52 | SOURCE_TIME_BOOTTIME_ALARM, | |
fd38203a LP |
53 | SOURCE_SIGNAL, |
54 | SOURCE_CHILD, | |
da7e457c | 55 | SOURCE_DEFER, |
6e9feda3 | 56 | SOURCE_POST, |
6203e07a | 57 | SOURCE_EXIT, |
6a0f1f6d | 58 | SOURCE_WATCHDOG, |
a71fe8b8 | 59 | _SOURCE_EVENT_SOURCE_TYPE_MAX, |
6a0f1f6d | 60 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 |
fd38203a LP |
61 | } EventSourceType; |
62 | ||
9da4cb2b LP |
63 | /* All objects we use in epoll events start with this value, so that |
64 | * we know how to dispatch it */ | |
65 | typedef enum WakeupType { | |
66 | WAKEUP_NONE, | |
67 | WAKEUP_EVENT_SOURCE, | |
68 | WAKEUP_CLOCK_DATA, | |
69 | WAKEUP_SIGNAL_DATA, | |
70 | _WAKEUP_TYPE_MAX, | |
71 | _WAKEUP_TYPE_INVALID = -1, | |
72 | } WakeupType; | |
73 | ||
a8548816 | 74 | #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 | 75 | |
fd38203a | 76 | struct sd_event_source { |
9da4cb2b LP |
77 | WakeupType wakeup; |
78 | ||
da7e457c | 79 | unsigned n_ref; |
fd38203a LP |
80 | |
81 | sd_event *event; | |
82 | void *userdata; | |
718db961 | 83 | sd_event_handler_t prepare; |
fd38203a | 84 | |
356779df | 85 | char *description; |
f7f53e9e | 86 | |
6a0f1f6d | 87 | EventSourceType type:5; |
baf76283 | 88 | int enabled:3; |
fd38203a | 89 | bool pending:1; |
12179984 | 90 | bool dispatching:1; |
a71fe8b8 | 91 | bool floating:1; |
fd38203a | 92 | |
31927c16 | 93 | int64_t priority; |
fd38203a LP |
94 | unsigned pending_index; |
95 | unsigned prepare_index; | |
96 | unsigned pending_iteration; | |
97 | unsigned prepare_iteration; | |
98 | ||
a71fe8b8 LP |
99 | LIST_FIELDS(sd_event_source, sources); |
100 | ||
fd38203a LP |
101 | union { |
102 | struct { | |
718db961 | 103 | sd_event_io_handler_t callback; |
fd38203a LP |
104 | int fd; |
105 | uint32_t events; | |
106 | uint32_t revents; | |
107 | bool registered:1; | |
108 | } io; | |
109 | struct { | |
718db961 | 110 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
111 | usec_t next, accuracy; |
112 | unsigned earliest_index; | |
113 | unsigned latest_index; | |
fd38203a LP |
114 | } time; |
115 | struct { | |
718db961 | 116 | sd_event_signal_handler_t callback; |
fd38203a LP |
117 | struct signalfd_siginfo siginfo; |
118 | int sig; | |
119 | } signal; | |
120 | struct { | |
718db961 | 121 | sd_event_child_handler_t callback; |
fd38203a LP |
122 | siginfo_t siginfo; |
123 | pid_t pid; | |
124 | int options; | |
125 | } child; | |
126 | struct { | |
718db961 | 127 | sd_event_handler_t callback; |
fd38203a | 128 | } defer; |
6e9feda3 LP |
129 | struct { |
130 | sd_event_handler_t callback; | |
131 | } post; | |
da7e457c | 132 | struct { |
718db961 | 133 | sd_event_handler_t callback; |
da7e457c | 134 | unsigned prioq_index; |
6203e07a | 135 | } exit; |
fd38203a LP |
136 | }; |
137 | }; | |
138 | ||
6a0f1f6d | 139 | struct clock_data { |
9da4cb2b | 140 | WakeupType wakeup; |
6a0f1f6d LP |
141 | int fd; |
142 | ||
143 | /* For all clocks we maintain two priority queues each, one | |
144 | * ordered for the earliest times the events may be | |
145 | * dispatched, and one ordered by the latest times they must | |
146 | * have been dispatched. The range between the top entries in | |
147 | * the two prioqs is the time window we can freely schedule | |
148 | * wakeups in */ | |
149 | ||
150 | Prioq *earliest; | |
151 | Prioq *latest; | |
152 | usec_t next; | |
212bbb17 TG |
153 | |
154 | bool needs_rearm:1; | |
6a0f1f6d LP |
155 | }; |
156 | ||
9da4cb2b LP |
157 | struct signal_data { |
158 | WakeupType wakeup; | |
159 | ||
160 | /* For each priority we maintain one signal fd, so that we | |
161 | * only have to dequeue a single event per priority at a | |
162 | * time. */ | |
163 | ||
164 | int fd; | |
165 | int64_t priority; | |
166 | sigset_t sigset; | |
167 | sd_event_source *current; | |
168 | }; | |
169 | ||
fd38203a | 170 | struct sd_event { |
da7e457c | 171 | unsigned n_ref; |
fd38203a LP |
172 | |
173 | int epoll_fd; | |
cde93897 | 174 | int watchdog_fd; |
fd38203a LP |
175 | |
176 | Prioq *pending; | |
177 | Prioq *prepare; | |
c2ba3ad6 | 178 | |
a8548816 | 179 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
180 | * can add support for more clocks when the kernel learns to |
181 | * deal with them, too. */ | |
182 | struct clock_data realtime; | |
a8548816 | 183 | struct clock_data boottime; |
6a0f1f6d LP |
184 | struct clock_data monotonic; |
185 | struct clock_data realtime_alarm; | |
186 | struct clock_data boottime_alarm; | |
fd38203a | 187 | |
da7e457c LP |
188 | usec_t perturb; |
189 | ||
9da4cb2b LP |
190 | sd_event_source **signal_sources; /* indexed by signal number */ |
191 | Hashmap *signal_data; /* indexed by priority */ | |
fd38203a LP |
192 | |
193 | Hashmap *child_sources; | |
baf76283 | 194 | unsigned n_enabled_child_sources; |
fd38203a | 195 | |
6e9feda3 LP |
196 | Set *post_sources; |
197 | ||
6203e07a | 198 | Prioq *exit; |
fd38203a | 199 | |
da7e457c | 200 | pid_t original_pid; |
c2ba3ad6 | 201 | |
da7e457c | 202 | unsigned iteration; |
46e8c825 | 203 | dual_timestamp timestamp; |
6a0f1f6d | 204 | usec_t timestamp_boottime; |
da7e457c | 205 | int state; |
eaa3cbef | 206 | |
6203e07a | 207 | bool exit_requested:1; |
da7e457c | 208 | bool need_process_child:1; |
cde93897 | 209 | bool watchdog:1; |
afc6adb5 | 210 | |
6203e07a LP |
211 | int exit_code; |
212 | ||
afc6adb5 LP |
213 | pid_t tid; |
214 | sd_event **default_event_ptr; | |
cde93897 LP |
215 | |
216 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
217 | |
218 | unsigned n_sources; | |
a71fe8b8 LP |
219 | |
220 | LIST_HEAD(sd_event_source, sources); | |
fd38203a LP |
221 | }; |
222 | ||
a71fe8b8 LP |
223 | static void source_disconnect(sd_event_source *s); |
224 | ||
fd38203a LP |
225 | static int pending_prioq_compare(const void *a, const void *b) { |
226 | const sd_event_source *x = a, *y = b; | |
227 | ||
228 | assert(x->pending); | |
229 | assert(y->pending); | |
230 | ||
baf76283 LP |
231 | /* Enabled ones first */ |
232 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 233 | return -1; |
baf76283 | 234 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
235 | return 1; |
236 | ||
237 | /* Lower priority values first */ | |
238 | if (x->priority < y->priority) | |
239 | return -1; | |
240 | if (x->priority > y->priority) | |
241 | return 1; | |
242 | ||
243 | /* Older entries first */ | |
244 | if (x->pending_iteration < y->pending_iteration) | |
245 | return -1; | |
246 | if (x->pending_iteration > y->pending_iteration) | |
247 | return 1; | |
248 | ||
fd38203a LP |
249 | return 0; |
250 | } | |
251 | ||
252 | static int prepare_prioq_compare(const void *a, const void *b) { | |
253 | const sd_event_source *x = a, *y = b; | |
254 | ||
255 | assert(x->prepare); | |
256 | assert(y->prepare); | |
257 | ||
8046c457 KK |
258 | /* Enabled ones first */ |
259 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
260 | return -1; | |
261 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
262 | return 1; | |
263 | ||
fd38203a LP |
264 | /* Move most recently prepared ones last, so that we can stop |
265 | * preparing as soon as we hit one that has already been | |
266 | * prepared in the current iteration */ | |
267 | if (x->prepare_iteration < y->prepare_iteration) | |
268 | return -1; | |
269 | if (x->prepare_iteration > y->prepare_iteration) | |
270 | return 1; | |
271 | ||
fd38203a LP |
272 | /* Lower priority values first */ |
273 | if (x->priority < y->priority) | |
274 | return -1; | |
275 | if (x->priority > y->priority) | |
276 | return 1; | |
277 | ||
fd38203a LP |
278 | return 0; |
279 | } | |
280 | ||
c2ba3ad6 | 281 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
282 | const sd_event_source *x = a, *y = b; |
283 | ||
6a0f1f6d LP |
284 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
285 | assert(x->type == y->type); | |
fd38203a | 286 | |
baf76283 LP |
287 | /* Enabled ones first */ |
288 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 289 | return -1; |
baf76283 | 290 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
291 | return 1; |
292 | ||
293 | /* Move the pending ones to the end */ | |
294 | if (!x->pending && y->pending) | |
295 | return -1; | |
296 | if (x->pending && !y->pending) | |
297 | return 1; | |
298 | ||
299 | /* Order by time */ | |
300 | if (x->time.next < y->time.next) | |
301 | return -1; | |
302 | if (x->time.next > y->time.next) | |
a99badf5 | 303 | return 1; |
fd38203a | 304 | |
fd38203a LP |
305 | return 0; |
306 | } | |
307 | ||
c2ba3ad6 LP |
308 | static int latest_time_prioq_compare(const void *a, const void *b) { |
309 | const sd_event_source *x = a, *y = b; | |
310 | ||
6a0f1f6d LP |
311 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
312 | assert(x->type == y->type); | |
c2ba3ad6 | 313 | |
baf76283 LP |
314 | /* Enabled ones first */ |
315 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 316 | return -1; |
baf76283 | 317 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
318 | return 1; |
319 | ||
320 | /* Move the pending ones to the end */ | |
321 | if (!x->pending && y->pending) | |
322 | return -1; | |
323 | if (x->pending && !y->pending) | |
324 | return 1; | |
325 | ||
326 | /* Order by time */ | |
327 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
328 | return -1; | |
329 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
a99badf5 | 330 | return 1; |
c2ba3ad6 | 331 | |
c2ba3ad6 LP |
332 | return 0; |
333 | } | |
334 | ||
6203e07a | 335 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
336 | const sd_event_source *x = a, *y = b; |
337 | ||
6203e07a LP |
338 | assert(x->type == SOURCE_EXIT); |
339 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 340 | |
baf76283 LP |
341 | /* Enabled ones first */ |
342 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 343 | return -1; |
baf76283 | 344 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
345 | return 1; |
346 | ||
347 | /* Lower priority values first */ | |
348 | if (x->priority < y->priority) | |
349 | return -1; | |
350 | if (x->priority > y->priority) | |
351 | return 1; | |
352 | ||
da7e457c LP |
353 | return 0; |
354 | } | |
355 | ||
6a0f1f6d LP |
356 | static void free_clock_data(struct clock_data *d) { |
357 | assert(d); | |
9da4cb2b | 358 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
359 | |
360 | safe_close(d->fd); | |
361 | prioq_free(d->earliest); | |
362 | prioq_free(d->latest); | |
363 | } | |
364 | ||
fd38203a | 365 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
366 | sd_event_source *s; |
367 | ||
fd38203a | 368 | assert(e); |
a71fe8b8 LP |
369 | |
370 | while ((s = e->sources)) { | |
371 | assert(s->floating); | |
372 | source_disconnect(s); | |
373 | sd_event_source_unref(s); | |
374 | } | |
375 | ||
15b38f93 | 376 | assert(e->n_sources == 0); |
fd38203a | 377 | |
afc6adb5 LP |
378 | if (e->default_event_ptr) |
379 | *(e->default_event_ptr) = NULL; | |
380 | ||
03e334a1 | 381 | safe_close(e->epoll_fd); |
03e334a1 | 382 | safe_close(e->watchdog_fd); |
cde93897 | 383 | |
6a0f1f6d | 384 | free_clock_data(&e->realtime); |
a8548816 | 385 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
386 | free_clock_data(&e->monotonic); |
387 | free_clock_data(&e->realtime_alarm); | |
388 | free_clock_data(&e->boottime_alarm); | |
389 | ||
fd38203a LP |
390 | prioq_free(e->pending); |
391 | prioq_free(e->prepare); | |
6203e07a | 392 | prioq_free(e->exit); |
fd38203a LP |
393 | |
394 | free(e->signal_sources); | |
9da4cb2b | 395 | hashmap_free(e->signal_data); |
fd38203a LP |
396 | |
397 | hashmap_free(e->child_sources); | |
6e9feda3 | 398 | set_free(e->post_sources); |
fd38203a LP |
399 | free(e); |
400 | } | |
401 | ||
f7262a9f | 402 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
403 | sd_event *e; |
404 | int r; | |
405 | ||
305f78bf | 406 | assert_return(ret, -EINVAL); |
fd38203a LP |
407 | |
408 | e = new0(sd_event, 1); | |
409 | if (!e) | |
410 | return -ENOMEM; | |
411 | ||
da7e457c | 412 | e->n_ref = 1; |
9da4cb2b | 413 | 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 | 414 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
9da4cb2b | 415 | e->realtime.wakeup = e->boottime.wakeup = e->monotonic.wakeup = e->realtime_alarm.wakeup = e->boottime_alarm.wakeup = WAKEUP_CLOCK_DATA; |
eaa3cbef | 416 | e->original_pid = getpid(); |
3a43da28 | 417 | e->perturb = USEC_INFINITY; |
fd38203a | 418 | |
fd38203a LP |
419 | e->pending = prioq_new(pending_prioq_compare); |
420 | if (!e->pending) { | |
421 | r = -ENOMEM; | |
422 | goto fail; | |
423 | } | |
424 | ||
425 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
426 | if (e->epoll_fd < 0) { | |
427 | r = -errno; | |
428 | goto fail; | |
429 | } | |
430 | ||
431 | *ret = e; | |
432 | return 0; | |
433 | ||
434 | fail: | |
435 | event_free(e); | |
436 | return r; | |
437 | } | |
438 | ||
f7262a9f | 439 | _public_ sd_event* sd_event_ref(sd_event *e) { |
6680dd6b LP |
440 | |
441 | if (!e) | |
442 | return NULL; | |
fd38203a | 443 | |
da7e457c LP |
444 | assert(e->n_ref >= 1); |
445 | e->n_ref++; | |
fd38203a LP |
446 | |
447 | return e; | |
448 | } | |
449 | ||
f7262a9f | 450 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
451 | |
452 | if (!e) | |
453 | return NULL; | |
fd38203a | 454 | |
da7e457c LP |
455 | assert(e->n_ref >= 1); |
456 | e->n_ref--; | |
457 | ||
458 | if (e->n_ref <= 0) | |
fd38203a LP |
459 | event_free(e); |
460 | ||
461 | return NULL; | |
462 | } | |
463 | ||
eaa3cbef LP |
464 | static bool event_pid_changed(sd_event *e) { |
465 | assert(e); | |
466 | ||
a2360a46 | 467 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
468 | * it around over a fork(). Let's complain. */ |
469 | ||
470 | return e->original_pid != getpid(); | |
471 | } | |
472 | ||
366e6411 | 473 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
474 | int r; |
475 | ||
476 | assert(s); | |
477 | assert(s->type == SOURCE_IO); | |
478 | ||
f6806734 | 479 | if (event_pid_changed(s->event)) |
366e6411 | 480 | return; |
f6806734 | 481 | |
fd38203a | 482 | if (!s->io.registered) |
366e6411 | 483 | return; |
fd38203a LP |
484 | |
485 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
556c25cf LP |
486 | if (r < 0) |
487 | log_debug_errno(errno, "Failed to remove source %s from epoll: %m", strna(s->description)); | |
fd38203a LP |
488 | |
489 | s->io.registered = false; | |
fd38203a LP |
490 | } |
491 | ||
305f78bf LP |
492 | static int source_io_register( |
493 | sd_event_source *s, | |
494 | int enabled, | |
495 | uint32_t events) { | |
496 | ||
fd38203a LP |
497 | struct epoll_event ev = {}; |
498 | int r; | |
499 | ||
500 | assert(s); | |
501 | assert(s->type == SOURCE_IO); | |
baf76283 | 502 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
503 | |
504 | ev.events = events; | |
505 | ev.data.ptr = s; | |
506 | ||
baf76283 | 507 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
508 | ev.events |= EPOLLONESHOT; |
509 | ||
510 | if (s->io.registered) | |
511 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
512 | else | |
513 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
fd38203a LP |
514 | if (r < 0) |
515 | return -errno; | |
516 | ||
517 | s->io.registered = true; | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
6a0f1f6d LP |
522 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
523 | ||
524 | switch (t) { | |
525 | ||
526 | case SOURCE_TIME_REALTIME: | |
527 | return CLOCK_REALTIME; | |
528 | ||
a8548816 TG |
529 | case SOURCE_TIME_BOOTTIME: |
530 | return CLOCK_BOOTTIME; | |
531 | ||
6a0f1f6d LP |
532 | case SOURCE_TIME_MONOTONIC: |
533 | return CLOCK_MONOTONIC; | |
534 | ||
535 | case SOURCE_TIME_REALTIME_ALARM: | |
536 | return CLOCK_REALTIME_ALARM; | |
537 | ||
538 | case SOURCE_TIME_BOOTTIME_ALARM: | |
539 | return CLOCK_BOOTTIME_ALARM; | |
540 | ||
541 | default: | |
542 | return (clockid_t) -1; | |
543 | } | |
544 | } | |
545 | ||
546 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
547 | ||
548 | switch (clock) { | |
549 | ||
550 | case CLOCK_REALTIME: | |
551 | return SOURCE_TIME_REALTIME; | |
552 | ||
a8548816 TG |
553 | case CLOCK_BOOTTIME: |
554 | return SOURCE_TIME_BOOTTIME; | |
555 | ||
6a0f1f6d LP |
556 | case CLOCK_MONOTONIC: |
557 | return SOURCE_TIME_MONOTONIC; | |
558 | ||
559 | case CLOCK_REALTIME_ALARM: | |
560 | return SOURCE_TIME_REALTIME_ALARM; | |
561 | ||
562 | case CLOCK_BOOTTIME_ALARM: | |
563 | return SOURCE_TIME_BOOTTIME_ALARM; | |
564 | ||
565 | default: | |
566 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
567 | } | |
568 | } | |
569 | ||
570 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
571 | assert(e); | |
572 | ||
573 | switch (t) { | |
574 | ||
575 | case SOURCE_TIME_REALTIME: | |
576 | return &e->realtime; | |
577 | ||
a8548816 TG |
578 | case SOURCE_TIME_BOOTTIME: |
579 | return &e->boottime; | |
580 | ||
6a0f1f6d LP |
581 | case SOURCE_TIME_MONOTONIC: |
582 | return &e->monotonic; | |
583 | ||
584 | case SOURCE_TIME_REALTIME_ALARM: | |
585 | return &e->realtime_alarm; | |
586 | ||
587 | case SOURCE_TIME_BOOTTIME_ALARM: | |
588 | return &e->boottime_alarm; | |
589 | ||
590 | default: | |
591 | return NULL; | |
592 | } | |
593 | } | |
594 | ||
9da4cb2b LP |
595 | static int event_make_signal_data( |
596 | sd_event *e, | |
597 | int sig, | |
598 | struct signal_data **ret) { | |
4807d2d0 | 599 | |
f95387cd | 600 | struct epoll_event ev = {}; |
9da4cb2b LP |
601 | struct signal_data *d; |
602 | bool added = false; | |
603 | sigset_t ss_copy; | |
604 | int64_t priority; | |
f95387cd ZJS |
605 | int r; |
606 | ||
607 | assert(e); | |
608 | ||
f6806734 | 609 | if (event_pid_changed(e)) |
9da4cb2b | 610 | return -ECHILD; |
f6806734 | 611 | |
9da4cb2b LP |
612 | if (e->signal_sources && e->signal_sources[sig]) |
613 | priority = e->signal_sources[sig]->priority; | |
614 | else | |
615 | priority = 0; | |
f95387cd | 616 | |
9da4cb2b LP |
617 | d = hashmap_get(e->signal_data, &priority); |
618 | if (d) { | |
619 | if (sigismember(&d->sigset, sig) > 0) { | |
620 | if (ret) | |
621 | *ret = d; | |
622 | return 0; | |
623 | } | |
624 | } else { | |
625 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); | |
626 | if (r < 0) | |
627 | return r; | |
628 | ||
629 | d = new0(struct signal_data, 1); | |
630 | if (!d) | |
631 | return -ENOMEM; | |
632 | ||
633 | d->wakeup = WAKEUP_SIGNAL_DATA; | |
634 | d->fd = -1; | |
635 | d->priority = priority; | |
636 | ||
637 | r = hashmap_put(e->signal_data, &d->priority, d); | |
638 | if (r < 0) | |
639 | return r; | |
f95387cd | 640 | |
9da4cb2b LP |
641 | added = true; |
642 | } | |
643 | ||
644 | ss_copy = d->sigset; | |
645 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
646 | ||
647 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
648 | if (r < 0) { | |
649 | r = -errno; | |
650 | goto fail; | |
651 | } | |
652 | ||
653 | d->sigset = ss_copy; | |
f95387cd | 654 | |
9da4cb2b LP |
655 | if (d->fd >= 0) { |
656 | if (ret) | |
657 | *ret = d; | |
f95387cd | 658 | return 0; |
9da4cb2b LP |
659 | } |
660 | ||
661 | d->fd = r; | |
f95387cd ZJS |
662 | |
663 | ev.events = EPOLLIN; | |
9da4cb2b | 664 | ev.data.ptr = d; |
f95387cd | 665 | |
9da4cb2b LP |
666 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
667 | if (r < 0) { | |
668 | r = -errno; | |
669 | goto fail; | |
f95387cd ZJS |
670 | } |
671 | ||
9da4cb2b LP |
672 | if (ret) |
673 | *ret = d; | |
674 | ||
f95387cd | 675 | return 0; |
9da4cb2b LP |
676 | |
677 | fail: | |
678 | if (added) { | |
679 | d->fd = safe_close(d->fd); | |
680 | hashmap_remove(e->signal_data, &d->priority); | |
681 | free(d); | |
682 | } | |
683 | ||
684 | return r; | |
685 | } | |
686 | ||
687 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
688 | assert(e); | |
689 | assert(d); | |
690 | ||
691 | /* Turns off the specified signal in the signal data | |
692 | * object. If the signal mask of the object becomes empty that | |
693 | * way removes it. */ | |
694 | ||
695 | if (sigismember(&d->sigset, sig) == 0) | |
696 | return; | |
697 | ||
698 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
699 | ||
700 | if (sigisemptyset(&d->sigset)) { | |
701 | ||
702 | /* If all the mask is all-zero we can get rid of the structure */ | |
703 | hashmap_remove(e->signal_data, &d->priority); | |
704 | assert(!d->current); | |
705 | safe_close(d->fd); | |
706 | free(d); | |
707 | return; | |
708 | } | |
709 | ||
710 | assert(d->fd >= 0); | |
711 | ||
712 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
713 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
714 | } | |
715 | ||
716 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
717 | struct signal_data *d; | |
718 | static const int64_t zero_priority = 0; | |
719 | ||
720 | assert(e); | |
721 | ||
722 | /* Rechecks if the specified signal is still something we are | |
723 | * interested in. If not, we'll unmask it, and possibly drop | |
724 | * the signalfd for it. */ | |
725 | ||
726 | if (sig == SIGCHLD && | |
727 | e->n_enabled_child_sources > 0) | |
728 | return; | |
729 | ||
730 | if (e->signal_sources && | |
731 | e->signal_sources[sig] && | |
732 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
733 | return; | |
734 | ||
735 | /* | |
736 | * The specified signal might be enabled in three different queues: | |
737 | * | |
738 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
739 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
740 | * 3) the 0 priority (to cover the SIGCHLD case) | |
741 | * | |
742 | * Hence, let's remove it from all three here. | |
743 | */ | |
744 | ||
745 | if (priority) { | |
746 | d = hashmap_get(e->signal_data, priority); | |
747 | if (d) | |
748 | event_unmask_signal_data(e, d, sig); | |
749 | } | |
750 | ||
751 | if (e->signal_sources && e->signal_sources[sig]) { | |
752 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
753 | if (d) | |
754 | event_unmask_signal_data(e, d, sig); | |
755 | } | |
756 | ||
757 | d = hashmap_get(e->signal_data, &zero_priority); | |
758 | if (d) | |
759 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
760 | } |
761 | ||
a71fe8b8 LP |
762 | static void source_disconnect(sd_event_source *s) { |
763 | sd_event *event; | |
764 | ||
fd38203a LP |
765 | assert(s); |
766 | ||
a71fe8b8 LP |
767 | if (!s->event) |
768 | return; | |
15b38f93 | 769 | |
a71fe8b8 | 770 | assert(s->event->n_sources > 0); |
fd38203a | 771 | |
a71fe8b8 | 772 | switch (s->type) { |
fd38203a | 773 | |
a71fe8b8 LP |
774 | case SOURCE_IO: |
775 | if (s->io.fd >= 0) | |
776 | source_io_unregister(s); | |
fd38203a | 777 | |
a71fe8b8 | 778 | break; |
6a0f1f6d | 779 | |
a71fe8b8 | 780 | case SOURCE_TIME_REALTIME: |
a8548816 | 781 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
782 | case SOURCE_TIME_MONOTONIC: |
783 | case SOURCE_TIME_REALTIME_ALARM: | |
784 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
785 | struct clock_data *d; | |
fd38203a | 786 | |
a71fe8b8 LP |
787 | d = event_get_clock_data(s->event, s->type); |
788 | assert(d); | |
789 | ||
790 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
791 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 792 | d->needs_rearm = true; |
a71fe8b8 LP |
793 | break; |
794 | } | |
795 | ||
796 | case SOURCE_SIGNAL: | |
797 | if (s->signal.sig > 0) { | |
9da4cb2b | 798 | |
a71fe8b8 LP |
799 | if (s->event->signal_sources) |
800 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 801 | |
9da4cb2b | 802 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 803 | } |
fd38203a | 804 | |
a71fe8b8 | 805 | break; |
fd38203a | 806 | |
a71fe8b8 LP |
807 | case SOURCE_CHILD: |
808 | if (s->child.pid > 0) { | |
809 | if (s->enabled != SD_EVENT_OFF) { | |
810 | assert(s->event->n_enabled_child_sources > 0); | |
811 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 812 | } |
fd38203a | 813 | |
4a0b58c4 | 814 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
9da4cb2b | 815 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
a71fe8b8 | 816 | } |
fd38203a | 817 | |
a71fe8b8 | 818 | break; |
fd38203a | 819 | |
a71fe8b8 LP |
820 | case SOURCE_DEFER: |
821 | /* nothing */ | |
822 | break; | |
fd38203a | 823 | |
a71fe8b8 LP |
824 | case SOURCE_POST: |
825 | set_remove(s->event->post_sources, s); | |
826 | break; | |
da7e457c | 827 | |
a71fe8b8 LP |
828 | case SOURCE_EXIT: |
829 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
830 | break; | |
0eb2e0e3 | 831 | |
a71fe8b8 LP |
832 | default: |
833 | assert_not_reached("Wut? I shouldn't exist."); | |
834 | } | |
6e9feda3 | 835 | |
a71fe8b8 LP |
836 | if (s->pending) |
837 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 838 | |
a71fe8b8 LP |
839 | if (s->prepare) |
840 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 841 | |
a71fe8b8 | 842 | event = s->event; |
fd38203a | 843 | |
a71fe8b8 LP |
844 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
845 | s->event = NULL; | |
846 | LIST_REMOVE(sources, event->sources, s); | |
847 | event->n_sources--; | |
fd38203a | 848 | |
a71fe8b8 LP |
849 | if (!s->floating) |
850 | sd_event_unref(event); | |
851 | } | |
852 | ||
853 | static void source_free(sd_event_source *s) { | |
854 | assert(s); | |
fd38203a | 855 | |
a71fe8b8 | 856 | source_disconnect(s); |
356779df | 857 | free(s->description); |
fd38203a LP |
858 | free(s); |
859 | } | |
860 | ||
861 | static int source_set_pending(sd_event_source *s, bool b) { | |
862 | int r; | |
863 | ||
864 | assert(s); | |
6203e07a | 865 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
866 | |
867 | if (s->pending == b) | |
868 | return 0; | |
869 | ||
870 | s->pending = b; | |
871 | ||
872 | if (b) { | |
873 | s->pending_iteration = s->event->iteration; | |
874 | ||
875 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
876 | if (r < 0) { | |
877 | s->pending = false; | |
878 | return r; | |
879 | } | |
880 | } else | |
881 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
882 | ||
6a0f1f6d LP |
883 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
884 | struct clock_data *d; | |
885 | ||
886 | d = event_get_clock_data(s->event, s->type); | |
887 | assert(d); | |
888 | ||
889 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
890 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 891 | d->needs_rearm = true; |
2576a19e LP |
892 | } |
893 | ||
9da4cb2b LP |
894 | if (s->type == SOURCE_SIGNAL && !b) { |
895 | struct signal_data *d; | |
896 | ||
897 | d = hashmap_get(s->event->signal_data, &s->priority); | |
898 | if (d && d->current == s) | |
899 | d->current = NULL; | |
900 | } | |
901 | ||
fd38203a LP |
902 | return 0; |
903 | } | |
904 | ||
a71fe8b8 | 905 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
906 | sd_event_source *s; |
907 | ||
908 | assert(e); | |
909 | ||
910 | s = new0(sd_event_source, 1); | |
911 | if (!s) | |
912 | return NULL; | |
913 | ||
da7e457c | 914 | s->n_ref = 1; |
a71fe8b8 | 915 | s->event = e; |
4a134c49 | 916 | s->floating = floating; |
fd38203a | 917 | s->type = type; |
fd38203a | 918 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
919 | |
920 | if (!floating) | |
921 | sd_event_ref(e); | |
fd38203a | 922 | |
a71fe8b8 | 923 | LIST_PREPEND(sources, e->sources, s); |
15b38f93 LP |
924 | e->n_sources ++; |
925 | ||
fd38203a LP |
926 | return s; |
927 | } | |
928 | ||
f7262a9f | 929 | _public_ int sd_event_add_io( |
fd38203a | 930 | sd_event *e, |
151b9b96 | 931 | sd_event_source **ret, |
fd38203a LP |
932 | int fd, |
933 | uint32_t events, | |
718db961 | 934 | sd_event_io_handler_t callback, |
151b9b96 | 935 | void *userdata) { |
fd38203a LP |
936 | |
937 | sd_event_source *s; | |
938 | int r; | |
939 | ||
305f78bf | 940 | assert_return(e, -EINVAL); |
8ac43fee | 941 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 942 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 943 | assert_return(callback, -EINVAL); |
da7e457c | 944 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 945 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 946 | |
a71fe8b8 | 947 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
948 | if (!s) |
949 | return -ENOMEM; | |
950 | ||
9da4cb2b | 951 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
952 | s->io.fd = fd; |
953 | s->io.events = events; | |
954 | s->io.callback = callback; | |
955 | s->userdata = userdata; | |
baf76283 | 956 | s->enabled = SD_EVENT_ON; |
fd38203a | 957 | |
baf76283 | 958 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
959 | if (r < 0) { |
960 | source_free(s); | |
050f74f2 | 961 | return r; |
fd38203a LP |
962 | } |
963 | ||
a71fe8b8 LP |
964 | if (ret) |
965 | *ret = s; | |
966 | ||
fd38203a LP |
967 | return 0; |
968 | } | |
969 | ||
52444dc4 LP |
970 | static void initialize_perturb(sd_event *e) { |
971 | sd_id128_t bootid = {}; | |
972 | ||
973 | /* When we sleep for longer, we try to realign the wakeup to | |
974 | the same time wihtin each minute/second/250ms, so that | |
975 | events all across the system can be coalesced into a single | |
976 | CPU wakeup. However, let's take some system-specific | |
977 | randomness for this value, so that in a network of systems | |
978 | with synced clocks timer events are distributed a | |
979 | bit. Here, we calculate a perturbation usec offset from the | |
980 | boot ID. */ | |
981 | ||
3a43da28 | 982 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
983 | return; |
984 | ||
985 | if (sd_id128_get_boot(&bootid) >= 0) | |
986 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
987 | } | |
988 | ||
fd38203a LP |
989 | static int event_setup_timer_fd( |
990 | sd_event *e, | |
6a0f1f6d LP |
991 | struct clock_data *d, |
992 | clockid_t clock) { | |
fd38203a LP |
993 | |
994 | struct epoll_event ev = {}; | |
995 | int r, fd; | |
996 | ||
997 | assert(e); | |
6a0f1f6d | 998 | assert(d); |
fd38203a | 999 | |
6a0f1f6d | 1000 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
1001 | return 0; |
1002 | ||
6a0f1f6d | 1003 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
1004 | if (fd < 0) |
1005 | return -errno; | |
1006 | ||
1007 | ev.events = EPOLLIN; | |
9da4cb2b | 1008 | ev.data.ptr = d; |
fd38203a LP |
1009 | |
1010 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
1011 | if (r < 0) { | |
03e334a1 | 1012 | safe_close(fd); |
fd38203a LP |
1013 | return -errno; |
1014 | } | |
1015 | ||
6a0f1f6d | 1016 | d->fd = fd; |
fd38203a LP |
1017 | return 0; |
1018 | } | |
1019 | ||
c4f1aff2 TG |
1020 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1021 | assert(s); | |
1022 | ||
1023 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1024 | } | |
1025 | ||
6a0f1f6d | 1026 | _public_ int sd_event_add_time( |
fd38203a | 1027 | sd_event *e, |
151b9b96 | 1028 | sd_event_source **ret, |
6a0f1f6d | 1029 | clockid_t clock, |
fd38203a | 1030 | uint64_t usec, |
c2ba3ad6 | 1031 | uint64_t accuracy, |
718db961 | 1032 | sd_event_time_handler_t callback, |
151b9b96 | 1033 | void *userdata) { |
fd38203a | 1034 | |
6a0f1f6d | 1035 | EventSourceType type; |
fd38203a | 1036 | sd_event_source *s; |
6a0f1f6d | 1037 | struct clock_data *d; |
fd38203a LP |
1038 | int r; |
1039 | ||
305f78bf | 1040 | assert_return(e, -EINVAL); |
305f78bf LP |
1041 | assert_return(usec != (uint64_t) -1, -EINVAL); |
1042 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
da7e457c | 1043 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1044 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1045 | |
c4f1aff2 TG |
1046 | if (!callback) |
1047 | callback = time_exit_callback; | |
1048 | ||
6a0f1f6d | 1049 | type = clock_to_event_source_type(clock); |
15411c0c | 1050 | assert_return(type >= 0, -EOPNOTSUPP); |
6a0f1f6d LP |
1051 | |
1052 | d = event_get_clock_data(e, type); | |
1053 | assert(d); | |
c2ba3ad6 | 1054 | |
6a0f1f6d LP |
1055 | if (!d->earliest) { |
1056 | d->earliest = prioq_new(earliest_time_prioq_compare); | |
1057 | if (!d->earliest) | |
c2ba3ad6 LP |
1058 | return -ENOMEM; |
1059 | } | |
fd38203a | 1060 | |
6a0f1f6d LP |
1061 | if (!d->latest) { |
1062 | d->latest = prioq_new(latest_time_prioq_compare); | |
1063 | if (!d->latest) | |
fd38203a LP |
1064 | return -ENOMEM; |
1065 | } | |
1066 | ||
6a0f1f6d LP |
1067 | if (d->fd < 0) { |
1068 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1069 | if (r < 0) |
1070 | return r; | |
1071 | } | |
1072 | ||
a71fe8b8 | 1073 | s = source_new(e, !ret, type); |
fd38203a LP |
1074 | if (!s) |
1075 | return -ENOMEM; | |
1076 | ||
1077 | s->time.next = usec; | |
c2ba3ad6 | 1078 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1079 | s->time.callback = callback; |
da7e457c | 1080 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1081 | s->userdata = userdata; |
baf76283 | 1082 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1083 | |
e07bbb7c TG |
1084 | d->needs_rearm = true; |
1085 | ||
6a0f1f6d | 1086 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
1087 | if (r < 0) |
1088 | goto fail; | |
1089 | ||
6a0f1f6d | 1090 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
1091 | if (r < 0) |
1092 | goto fail; | |
fd38203a | 1093 | |
a71fe8b8 LP |
1094 | if (ret) |
1095 | *ret = s; | |
1096 | ||
fd38203a | 1097 | return 0; |
c2ba3ad6 LP |
1098 | |
1099 | fail: | |
1100 | source_free(s); | |
1101 | return r; | |
fd38203a LP |
1102 | } |
1103 | ||
59bc1fd7 LP |
1104 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1105 | assert(s); | |
1106 | ||
1107 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1108 | } | |
1109 | ||
f7262a9f | 1110 | _public_ int sd_event_add_signal( |
305f78bf | 1111 | sd_event *e, |
151b9b96 | 1112 | sd_event_source **ret, |
305f78bf | 1113 | int sig, |
718db961 | 1114 | sd_event_signal_handler_t callback, |
151b9b96 | 1115 | void *userdata) { |
305f78bf | 1116 | |
fd38203a | 1117 | sd_event_source *s; |
9da4cb2b | 1118 | struct signal_data *d; |
3022d74b | 1119 | sigset_t ss; |
fd38203a LP |
1120 | int r; |
1121 | ||
305f78bf LP |
1122 | assert_return(e, -EINVAL); |
1123 | assert_return(sig > 0, -EINVAL); | |
1124 | assert_return(sig < _NSIG, -EINVAL); | |
da7e457c | 1125 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1126 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1127 | |
59bc1fd7 LP |
1128 | if (!callback) |
1129 | callback = signal_exit_callback; | |
1130 | ||
3022d74b | 1131 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
50e0d56c LP |
1132 | if (r != 0) |
1133 | return -r; | |
3022d74b LP |
1134 | |
1135 | if (!sigismember(&ss, sig)) | |
1136 | return -EBUSY; | |
1137 | ||
fd38203a LP |
1138 | if (!e->signal_sources) { |
1139 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1140 | if (!e->signal_sources) | |
1141 | return -ENOMEM; | |
1142 | } else if (e->signal_sources[sig]) | |
1143 | return -EBUSY; | |
1144 | ||
a71fe8b8 | 1145 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1146 | if (!s) |
1147 | return -ENOMEM; | |
1148 | ||
1149 | s->signal.sig = sig; | |
1150 | s->signal.callback = callback; | |
1151 | s->userdata = userdata; | |
baf76283 | 1152 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1153 | |
1154 | e->signal_sources[sig] = s; | |
fd38203a | 1155 | |
9da4cb2b LP |
1156 | r = event_make_signal_data(e, sig, &d); |
1157 | if (r < 0) { | |
1158 | source_free(s); | |
1159 | return r; | |
fd38203a LP |
1160 | } |
1161 | ||
f1f00dbb LP |
1162 | /* Use the signal name as description for the event source by default */ |
1163 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1164 | ||
a71fe8b8 LP |
1165 | if (ret) |
1166 | *ret = s; | |
1167 | ||
fd38203a LP |
1168 | return 0; |
1169 | } | |
1170 | ||
f7262a9f | 1171 | _public_ int sd_event_add_child( |
305f78bf | 1172 | sd_event *e, |
151b9b96 | 1173 | sd_event_source **ret, |
305f78bf LP |
1174 | pid_t pid, |
1175 | int options, | |
718db961 | 1176 | sd_event_child_handler_t callback, |
151b9b96 | 1177 | void *userdata) { |
305f78bf | 1178 | |
fd38203a LP |
1179 | sd_event_source *s; |
1180 | int r; | |
1181 | ||
305f78bf LP |
1182 | assert_return(e, -EINVAL); |
1183 | assert_return(pid > 1, -EINVAL); | |
1184 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1185 | assert_return(options != 0, -EINVAL); | |
1186 | assert_return(callback, -EINVAL); | |
da7e457c | 1187 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1188 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1189 | |
d5099efc | 1190 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1191 | if (r < 0) |
1192 | return r; | |
1193 | ||
4a0b58c4 | 1194 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1195 | return -EBUSY; |
1196 | ||
a71fe8b8 | 1197 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1198 | if (!s) |
1199 | return -ENOMEM; | |
1200 | ||
1201 | s->child.pid = pid; | |
1202 | s->child.options = options; | |
1203 | s->child.callback = callback; | |
1204 | s->userdata = userdata; | |
baf76283 | 1205 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1206 | |
4a0b58c4 | 1207 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
fd38203a LP |
1208 | if (r < 0) { |
1209 | source_free(s); | |
1210 | return r; | |
1211 | } | |
1212 | ||
baf76283 | 1213 | e->n_enabled_child_sources ++; |
fd38203a | 1214 | |
9da4cb2b LP |
1215 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1216 | if (r < 0) { | |
1217 | e->n_enabled_child_sources--; | |
1218 | source_free(s); | |
1219 | return r; | |
fd38203a LP |
1220 | } |
1221 | ||
c2ba3ad6 LP |
1222 | e->need_process_child = true; |
1223 | ||
a71fe8b8 LP |
1224 | if (ret) |
1225 | *ret = s; | |
1226 | ||
fd38203a LP |
1227 | return 0; |
1228 | } | |
1229 | ||
f7262a9f | 1230 | _public_ int sd_event_add_defer( |
305f78bf | 1231 | sd_event *e, |
151b9b96 | 1232 | sd_event_source **ret, |
718db961 | 1233 | sd_event_handler_t callback, |
151b9b96 | 1234 | void *userdata) { |
305f78bf | 1235 | |
fd38203a LP |
1236 | sd_event_source *s; |
1237 | int r; | |
1238 | ||
305f78bf LP |
1239 | assert_return(e, -EINVAL); |
1240 | assert_return(callback, -EINVAL); | |
da7e457c | 1241 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1242 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1243 | |
a71fe8b8 | 1244 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1245 | if (!s) |
1246 | return -ENOMEM; | |
1247 | ||
1248 | s->defer.callback = callback; | |
1249 | s->userdata = userdata; | |
baf76283 | 1250 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1251 | |
1252 | r = source_set_pending(s, true); | |
1253 | if (r < 0) { | |
1254 | source_free(s); | |
1255 | return r; | |
1256 | } | |
1257 | ||
a71fe8b8 LP |
1258 | if (ret) |
1259 | *ret = s; | |
1260 | ||
fd38203a LP |
1261 | return 0; |
1262 | } | |
1263 | ||
6e9feda3 LP |
1264 | _public_ int sd_event_add_post( |
1265 | sd_event *e, | |
1266 | sd_event_source **ret, | |
1267 | sd_event_handler_t callback, | |
1268 | void *userdata) { | |
1269 | ||
1270 | sd_event_source *s; | |
1271 | int r; | |
1272 | ||
1273 | assert_return(e, -EINVAL); | |
1274 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1275 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1276 | assert_return(!event_pid_changed(e), -ECHILD); | |
1277 | ||
d5099efc | 1278 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1279 | if (r < 0) |
1280 | return r; | |
1281 | ||
a71fe8b8 | 1282 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1283 | if (!s) |
1284 | return -ENOMEM; | |
1285 | ||
1286 | s->post.callback = callback; | |
1287 | s->userdata = userdata; | |
1288 | s->enabled = SD_EVENT_ON; | |
1289 | ||
1290 | r = set_put(e->post_sources, s); | |
1291 | if (r < 0) { | |
1292 | source_free(s); | |
1293 | return r; | |
1294 | } | |
1295 | ||
a71fe8b8 LP |
1296 | if (ret) |
1297 | *ret = s; | |
1298 | ||
6e9feda3 LP |
1299 | return 0; |
1300 | } | |
1301 | ||
6203e07a | 1302 | _public_ int sd_event_add_exit( |
305f78bf | 1303 | sd_event *e, |
151b9b96 | 1304 | sd_event_source **ret, |
718db961 | 1305 | sd_event_handler_t callback, |
151b9b96 | 1306 | void *userdata) { |
305f78bf | 1307 | |
da7e457c LP |
1308 | sd_event_source *s; |
1309 | int r; | |
1310 | ||
1311 | assert_return(e, -EINVAL); | |
1312 | assert_return(callback, -EINVAL); | |
1313 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1314 | assert_return(!event_pid_changed(e), -ECHILD); | |
1315 | ||
6203e07a LP |
1316 | if (!e->exit) { |
1317 | e->exit = prioq_new(exit_prioq_compare); | |
1318 | if (!e->exit) | |
da7e457c LP |
1319 | return -ENOMEM; |
1320 | } | |
1321 | ||
a71fe8b8 | 1322 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1323 | if (!s) |
da7e457c | 1324 | return -ENOMEM; |
fd38203a | 1325 | |
6203e07a | 1326 | s->exit.callback = callback; |
da7e457c | 1327 | s->userdata = userdata; |
6203e07a | 1328 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1329 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1330 | |
6203e07a | 1331 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1332 | if (r < 0) { |
1333 | source_free(s); | |
1334 | return r; | |
1335 | } | |
1336 | ||
a71fe8b8 LP |
1337 | if (ret) |
1338 | *ret = s; | |
1339 | ||
da7e457c LP |
1340 | return 0; |
1341 | } | |
1342 | ||
f7262a9f | 1343 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
6680dd6b LP |
1344 | |
1345 | if (!s) | |
1346 | return NULL; | |
da7e457c LP |
1347 | |
1348 | assert(s->n_ref >= 1); | |
1349 | s->n_ref++; | |
fd38203a LP |
1350 | |
1351 | return s; | |
1352 | } | |
1353 | ||
f7262a9f | 1354 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1355 | |
1356 | if (!s) | |
1357 | return NULL; | |
fd38203a | 1358 | |
da7e457c LP |
1359 | assert(s->n_ref >= 1); |
1360 | s->n_ref--; | |
1361 | ||
12179984 LP |
1362 | if (s->n_ref <= 0) { |
1363 | /* Here's a special hack: when we are called from a | |
1364 | * dispatch handler we won't free the event source | |
1365 | * immediately, but we will detach the fd from the | |
1366 | * epoll. This way it is safe for the caller to unref | |
1367 | * the event source and immediately close the fd, but | |
1368 | * we still retain a valid event source object after | |
1369 | * the callback. */ | |
1370 | ||
1371 | if (s->dispatching) { | |
1372 | if (s->type == SOURCE_IO) | |
1373 | source_io_unregister(s); | |
a71fe8b8 LP |
1374 | |
1375 | source_disconnect(s); | |
12179984 LP |
1376 | } else |
1377 | source_free(s); | |
1378 | } | |
fd38203a LP |
1379 | |
1380 | return NULL; | |
1381 | } | |
1382 | ||
356779df | 1383 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1384 | assert_return(s, -EINVAL); |
f4b2933e | 1385 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1386 | |
356779df | 1387 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1388 | } |
1389 | ||
356779df | 1390 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1391 | assert_return(s, -EINVAL); |
356779df | 1392 | assert_return(description, -EINVAL); |
f4b2933e LP |
1393 | assert_return(s->description, -ENXIO); |
1394 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
f7f53e9e | 1395 | |
356779df | 1396 | *description = s->description; |
f7f53e9e TG |
1397 | return 0; |
1398 | } | |
1399 | ||
adcc4ca3 | 1400 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1401 | assert_return(s, NULL); |
eaa3cbef LP |
1402 | |
1403 | return s->event; | |
1404 | } | |
1405 | ||
f7262a9f | 1406 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1407 | assert_return(s, -EINVAL); |
6203e07a | 1408 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1409 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1410 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1411 | |
1412 | return s->pending; | |
1413 | } | |
1414 | ||
f7262a9f | 1415 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1416 | assert_return(s, -EINVAL); |
1417 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1418 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1419 | |
1420 | return s->io.fd; | |
1421 | } | |
1422 | ||
30caf8f3 LP |
1423 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1424 | int r; | |
1425 | ||
1426 | assert_return(s, -EINVAL); | |
8ac43fee | 1427 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1428 | assert_return(s->type == SOURCE_IO, -EDOM); |
1429 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1430 | ||
1431 | if (s->io.fd == fd) | |
1432 | return 0; | |
1433 | ||
1434 | if (s->enabled == SD_EVENT_OFF) { | |
1435 | s->io.fd = fd; | |
1436 | s->io.registered = false; | |
1437 | } else { | |
1438 | int saved_fd; | |
1439 | ||
1440 | saved_fd = s->io.fd; | |
1441 | assert(s->io.registered); | |
1442 | ||
1443 | s->io.fd = fd; | |
1444 | s->io.registered = false; | |
1445 | ||
1446 | r = source_io_register(s, s->enabled, s->io.events); | |
1447 | if (r < 0) { | |
1448 | s->io.fd = saved_fd; | |
1449 | s->io.registered = true; | |
1450 | return r; | |
1451 | } | |
1452 | ||
1453 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1454 | } | |
1455 | ||
1456 | return 0; | |
1457 | } | |
1458 | ||
f7262a9f | 1459 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1460 | assert_return(s, -EINVAL); |
1461 | assert_return(events, -EINVAL); | |
1462 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1463 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1464 | |
1465 | *events = s->io.events; | |
1466 | return 0; | |
1467 | } | |
1468 | ||
f7262a9f | 1469 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1470 | int r; |
1471 | ||
305f78bf LP |
1472 | assert_return(s, -EINVAL); |
1473 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1474 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1475 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1476 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1477 | |
b63c8d4f DH |
1478 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1479 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1480 | return 0; |
1481 | ||
baf76283 | 1482 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1483 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1484 | if (r < 0) |
1485 | return r; | |
1486 | } | |
1487 | ||
1488 | s->io.events = events; | |
503f39c3 | 1489 | source_set_pending(s, false); |
fd38203a LP |
1490 | |
1491 | return 0; | |
1492 | } | |
1493 | ||
f7262a9f | 1494 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1495 | assert_return(s, -EINVAL); |
1496 | assert_return(revents, -EINVAL); | |
1497 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1498 | assert_return(s->pending, -ENODATA); | |
1499 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1500 | |
1501 | *revents = s->io.revents; | |
1502 | return 0; | |
1503 | } | |
1504 | ||
f7262a9f | 1505 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1506 | assert_return(s, -EINVAL); |
1507 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1508 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1509 | |
1510 | return s->signal.sig; | |
1511 | } | |
1512 | ||
31927c16 | 1513 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1514 | assert_return(s, -EINVAL); |
1515 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1516 | |
1517 | return s->priority; | |
1518 | } | |
1519 | ||
31927c16 | 1520 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
9da4cb2b LP |
1521 | int r; |
1522 | ||
305f78bf | 1523 | assert_return(s, -EINVAL); |
da7e457c | 1524 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1525 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1526 | |
1527 | if (s->priority == priority) | |
1528 | return 0; | |
1529 | ||
9da4cb2b LP |
1530 | if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { |
1531 | struct signal_data *old, *d; | |
1532 | ||
1533 | /* Move us from the signalfd belonging to the old | |
1534 | * priority to the signalfd of the new priority */ | |
1535 | ||
1536 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
1537 | ||
1538 | s->priority = priority; | |
1539 | ||
1540 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
1541 | if (r < 0) { | |
1542 | s->priority = old->priority; | |
1543 | return r; | |
1544 | } | |
1545 | ||
1546 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
1547 | } else | |
1548 | s->priority = priority; | |
fd38203a LP |
1549 | |
1550 | if (s->pending) | |
c2ba3ad6 | 1551 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1552 | |
1553 | if (s->prepare) | |
c2ba3ad6 | 1554 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1555 | |
6203e07a LP |
1556 | if (s->type == SOURCE_EXIT) |
1557 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1558 | |
fd38203a LP |
1559 | return 0; |
1560 | } | |
1561 | ||
f7262a9f | 1562 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1563 | assert_return(s, -EINVAL); |
1564 | assert_return(m, -EINVAL); | |
1565 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1566 | |
baf76283 | 1567 | *m = s->enabled; |
fd38203a LP |
1568 | return 0; |
1569 | } | |
1570 | ||
f7262a9f | 1571 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1572 | int r; |
1573 | ||
305f78bf LP |
1574 | assert_return(s, -EINVAL); |
1575 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
305f78bf | 1576 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1577 | |
cc567911 LP |
1578 | /* If we are dead anyway, we are fine with turning off |
1579 | * sources, but everything else needs to fail. */ | |
1580 | if (s->event->state == SD_EVENT_FINISHED) | |
1581 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1582 | ||
baf76283 | 1583 | if (s->enabled == m) |
fd38203a LP |
1584 | return 0; |
1585 | ||
baf76283 | 1586 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1587 | |
1588 | switch (s->type) { | |
1589 | ||
1590 | case SOURCE_IO: | |
366e6411 | 1591 | source_io_unregister(s); |
baf76283 | 1592 | s->enabled = m; |
fd38203a LP |
1593 | break; |
1594 | ||
6a0f1f6d | 1595 | case SOURCE_TIME_REALTIME: |
a8548816 | 1596 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1597 | case SOURCE_TIME_MONOTONIC: |
1598 | case SOURCE_TIME_REALTIME_ALARM: | |
1599 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1600 | struct clock_data *d; | |
fd38203a | 1601 | |
baf76283 | 1602 | s->enabled = m; |
6a0f1f6d LP |
1603 | d = event_get_clock_data(s->event, s->type); |
1604 | assert(d); | |
1605 | ||
1606 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1607 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1608 | d->needs_rearm = true; |
fd38203a | 1609 | break; |
6a0f1f6d | 1610 | } |
fd38203a LP |
1611 | |
1612 | case SOURCE_SIGNAL: | |
baf76283 | 1613 | s->enabled = m; |
4807d2d0 | 1614 | |
9da4cb2b | 1615 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
fd38203a LP |
1616 | break; |
1617 | ||
1618 | case SOURCE_CHILD: | |
baf76283 | 1619 | s->enabled = m; |
fd38203a | 1620 | |
baf76283 LP |
1621 | assert(s->event->n_enabled_child_sources > 0); |
1622 | s->event->n_enabled_child_sources--; | |
fd38203a | 1623 | |
9da4cb2b | 1624 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
fd38203a LP |
1625 | break; |
1626 | ||
6203e07a | 1627 | case SOURCE_EXIT: |
305f78bf | 1628 | s->enabled = m; |
6203e07a | 1629 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1630 | break; |
1631 | ||
1632 | case SOURCE_DEFER: | |
6e9feda3 | 1633 | case SOURCE_POST: |
baf76283 | 1634 | s->enabled = m; |
fd38203a | 1635 | break; |
9d3e3aa5 | 1636 | |
6a0f1f6d | 1637 | default: |
9d3e3aa5 | 1638 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1639 | } |
1640 | ||
1641 | } else { | |
1642 | switch (s->type) { | |
1643 | ||
1644 | case SOURCE_IO: | |
1645 | r = source_io_register(s, m, s->io.events); | |
1646 | if (r < 0) | |
1647 | return r; | |
1648 | ||
baf76283 | 1649 | s->enabled = m; |
fd38203a LP |
1650 | break; |
1651 | ||
6a0f1f6d | 1652 | case SOURCE_TIME_REALTIME: |
a8548816 | 1653 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1654 | case SOURCE_TIME_MONOTONIC: |
1655 | case SOURCE_TIME_REALTIME_ALARM: | |
1656 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1657 | struct clock_data *d; | |
fd38203a | 1658 | |
baf76283 | 1659 | s->enabled = m; |
6a0f1f6d LP |
1660 | d = event_get_clock_data(s->event, s->type); |
1661 | assert(d); | |
1662 | ||
1663 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1664 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1665 | d->needs_rearm = true; |
fd38203a | 1666 | break; |
6a0f1f6d | 1667 | } |
fd38203a LP |
1668 | |
1669 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1670 | |
1671 | s->enabled = m; | |
9da4cb2b LP |
1672 | |
1673 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
1674 | if (r < 0) { | |
1675 | s->enabled = SD_EVENT_OFF; | |
1676 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
1677 | return r; | |
1678 | } | |
1679 | ||
fd38203a LP |
1680 | break; |
1681 | ||
1682 | case SOURCE_CHILD: | |
4807d2d0 | 1683 | |
9da4cb2b | 1684 | if (s->enabled == SD_EVENT_OFF) |
4807d2d0 | 1685 | s->event->n_enabled_child_sources++; |
7a0d4a3d DH |
1686 | |
1687 | s->enabled = m; | |
9da4cb2b | 1688 | |
10edebf6 | 1689 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
9da4cb2b LP |
1690 | if (r < 0) { |
1691 | s->enabled = SD_EVENT_OFF; | |
1692 | s->event->n_enabled_child_sources--; | |
1693 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
1694 | return r; | |
1695 | } | |
1696 | ||
fd38203a LP |
1697 | break; |
1698 | ||
6203e07a | 1699 | case SOURCE_EXIT: |
305f78bf | 1700 | s->enabled = m; |
6203e07a | 1701 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1702 | break; |
1703 | ||
1704 | case SOURCE_DEFER: | |
6e9feda3 | 1705 | case SOURCE_POST: |
baf76283 | 1706 | s->enabled = m; |
fd38203a | 1707 | break; |
9d3e3aa5 | 1708 | |
6a0f1f6d | 1709 | default: |
9d3e3aa5 | 1710 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1711 | } |
1712 | } | |
1713 | ||
1714 | if (s->pending) | |
1715 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1716 | ||
1717 | if (s->prepare) | |
1718 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1719 | ||
1720 | return 0; | |
1721 | } | |
1722 | ||
f7262a9f | 1723 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1724 | assert_return(s, -EINVAL); |
1725 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1726 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1727 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1728 | |
1729 | *usec = s->time.next; | |
1730 | return 0; | |
1731 | } | |
1732 | ||
f7262a9f | 1733 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1734 | struct clock_data *d; |
1735 | ||
305f78bf LP |
1736 | assert_return(s, -EINVAL); |
1737 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1738 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1739 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1740 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1741 | |
fd38203a | 1742 | s->time.next = usec; |
2576a19e | 1743 | |
0cc1125a | 1744 | source_set_pending(s, false); |
fd38203a | 1745 | |
6a0f1f6d LP |
1746 | d = event_get_clock_data(s->event, s->type); |
1747 | assert(d); | |
1748 | ||
1749 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1750 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1751 | d->needs_rearm = true; |
fd38203a LP |
1752 | |
1753 | return 0; | |
1754 | } | |
1755 | ||
f7262a9f | 1756 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1757 | assert_return(s, -EINVAL); |
1758 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1759 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1760 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1761 | ||
1762 | *usec = s->time.accuracy; | |
1763 | return 0; | |
1764 | } | |
1765 | ||
f7262a9f | 1766 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1767 | struct clock_data *d; |
1768 | ||
305f78bf LP |
1769 | assert_return(s, -EINVAL); |
1770 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1771 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1772 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1773 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1774 | |
1775 | if (usec == 0) | |
1776 | usec = DEFAULT_ACCURACY_USEC; | |
1777 | ||
eaa3cbef LP |
1778 | s->time.accuracy = usec; |
1779 | ||
2576a19e LP |
1780 | source_set_pending(s, false); |
1781 | ||
6a0f1f6d LP |
1782 | d = event_get_clock_data(s->event, s->type); |
1783 | assert(d); | |
1784 | ||
1785 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1786 | d->needs_rearm = true; |
6a0f1f6d LP |
1787 | |
1788 | return 0; | |
1789 | } | |
1790 | ||
1791 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1792 | assert_return(s, -EINVAL); | |
1793 | assert_return(clock, -EINVAL); | |
1794 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1795 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1796 | |
6a0f1f6d | 1797 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1798 | return 0; |
1799 | } | |
1800 | ||
f7262a9f | 1801 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1802 | assert_return(s, -EINVAL); |
1803 | assert_return(pid, -EINVAL); | |
1804 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1805 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1806 | ||
1807 | *pid = s->child.pid; | |
1808 | return 0; | |
1809 | } | |
1810 | ||
718db961 | 1811 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1812 | int r; |
1813 | ||
da7e457c | 1814 | assert_return(s, -EINVAL); |
6203e07a | 1815 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1816 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1817 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1818 | |
1819 | if (s->prepare == callback) | |
1820 | return 0; | |
1821 | ||
1822 | if (callback && s->prepare) { | |
1823 | s->prepare = callback; | |
1824 | return 0; | |
1825 | } | |
1826 | ||
1827 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1828 | if (r < 0) | |
1829 | return r; | |
1830 | ||
1831 | s->prepare = callback; | |
1832 | ||
1833 | if (callback) { | |
1834 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1835 | if (r < 0) | |
1836 | return r; | |
1837 | } else | |
1838 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1839 | ||
1840 | return 0; | |
1841 | } | |
1842 | ||
f7262a9f | 1843 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1844 | assert_return(s, NULL); |
fd38203a LP |
1845 | |
1846 | return s->userdata; | |
1847 | } | |
1848 | ||
8f726607 LP |
1849 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1850 | void *ret; | |
1851 | ||
1852 | assert_return(s, NULL); | |
1853 | ||
1854 | ret = s->userdata; | |
1855 | s->userdata = userdata; | |
1856 | ||
1857 | return ret; | |
1858 | } | |
1859 | ||
c2ba3ad6 LP |
1860 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1861 | usec_t c; | |
1862 | assert(e); | |
1863 | assert(a <= b); | |
1864 | ||
1865 | if (a <= 0) | |
1866 | return 0; | |
1867 | ||
1868 | if (b <= a + 1) | |
1869 | return a; | |
1870 | ||
52444dc4 LP |
1871 | initialize_perturb(e); |
1872 | ||
c2ba3ad6 LP |
1873 | /* |
1874 | Find a good time to wake up again between times a and b. We | |
1875 | have two goals here: | |
1876 | ||
1877 | a) We want to wake up as seldom as possible, hence prefer | |
1878 | later times over earlier times. | |
1879 | ||
1880 | b) But if we have to wake up, then let's make sure to | |
1881 | dispatch as much as possible on the entire system. | |
1882 | ||
1883 | We implement this by waking up everywhere at the same time | |
850516e0 | 1884 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1885 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1886 | then we try to find the same spot in every 10s, then 1s and |
1887 | then 250ms step. Otherwise, we pick the last possible time | |
1888 | to wake up. | |
c2ba3ad6 LP |
1889 | */ |
1890 | ||
850516e0 LP |
1891 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1892 | if (c >= b) { | |
1893 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1894 | return b; | |
1895 | ||
1896 | c -= USEC_PER_MINUTE; | |
1897 | } | |
1898 | ||
ba276c81 LP |
1899 | if (c >= a) |
1900 | return c; | |
1901 | ||
1902 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1903 | if (c >= b) { | |
1904 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1905 | return b; | |
1906 | ||
1907 | c -= USEC_PER_SEC*10; | |
1908 | } | |
1909 | ||
850516e0 LP |
1910 | if (c >= a) |
1911 | return c; | |
1912 | ||
1913 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1914 | if (c >= b) { |
1915 | if (_unlikely_(c < USEC_PER_SEC)) | |
1916 | return b; | |
1917 | ||
1918 | c -= USEC_PER_SEC; | |
1919 | } | |
1920 | ||
1921 | if (c >= a) | |
1922 | return c; | |
1923 | ||
1924 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1925 | if (c >= b) { | |
1926 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1927 | return b; | |
1928 | ||
1929 | c -= USEC_PER_MSEC*250; | |
1930 | } | |
1931 | ||
1932 | if (c >= a) | |
1933 | return c; | |
1934 | ||
1935 | return b; | |
1936 | } | |
1937 | ||
fd38203a LP |
1938 | static int event_arm_timer( |
1939 | sd_event *e, | |
6a0f1f6d | 1940 | struct clock_data *d) { |
fd38203a LP |
1941 | |
1942 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1943 | sd_event_source *a, *b; |
1944 | usec_t t; | |
fd38203a LP |
1945 | int r; |
1946 | ||
cde93897 | 1947 | assert(e); |
6a0f1f6d | 1948 | assert(d); |
fd38203a | 1949 | |
d06441da | 1950 | if (!d->needs_rearm) |
212bbb17 TG |
1951 | return 0; |
1952 | else | |
1953 | d->needs_rearm = false; | |
1954 | ||
6a0f1f6d | 1955 | a = prioq_peek(d->earliest); |
72aedc1e LP |
1956 | if (!a || a->enabled == SD_EVENT_OFF) { |
1957 | ||
6a0f1f6d | 1958 | if (d->fd < 0) |
c57b5ca3 LP |
1959 | return 0; |
1960 | ||
3a43da28 | 1961 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
1962 | return 0; |
1963 | ||
1964 | /* disarm */ | |
6a0f1f6d | 1965 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1966 | if (r < 0) |
1967 | return r; | |
1968 | ||
3a43da28 | 1969 | d->next = USEC_INFINITY; |
fd38203a | 1970 | return 0; |
72aedc1e | 1971 | } |
fd38203a | 1972 | |
6a0f1f6d | 1973 | b = prioq_peek(d->latest); |
baf76283 | 1974 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1975 | |
1976 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
6a0f1f6d | 1977 | if (d->next == t) |
fd38203a LP |
1978 | return 0; |
1979 | ||
6a0f1f6d | 1980 | assert_se(d->fd >= 0); |
fd38203a | 1981 | |
c2ba3ad6 | 1982 | if (t == 0) { |
fd38203a LP |
1983 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1984 | its.it_value.tv_sec = 0; | |
1985 | its.it_value.tv_nsec = 1; | |
1986 | } else | |
c2ba3ad6 | 1987 | timespec_store(&its.it_value, t); |
fd38203a | 1988 | |
6a0f1f6d | 1989 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 1990 | if (r < 0) |
cde93897 | 1991 | return -errno; |
fd38203a | 1992 | |
6a0f1f6d | 1993 | d->next = t; |
fd38203a LP |
1994 | return 0; |
1995 | } | |
1996 | ||
9a800b56 | 1997 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
1998 | assert(e); |
1999 | assert(s); | |
2000 | assert(s->type == SOURCE_IO); | |
2001 | ||
9a800b56 LP |
2002 | /* If the event source was already pending, we just OR in the |
2003 | * new revents, otherwise we reset the value. The ORing is | |
2004 | * necessary to handle EPOLLONESHOT events properly where | |
2005 | * readability might happen independently of writability, and | |
2006 | * we need to keep track of both */ | |
2007 | ||
2008 | if (s->pending) | |
2009 | s->io.revents |= revents; | |
2010 | else | |
2011 | s->io.revents = revents; | |
fd38203a | 2012 | |
fd38203a LP |
2013 | return source_set_pending(s, true); |
2014 | } | |
2015 | ||
72aedc1e | 2016 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2017 | uint64_t x; |
2018 | ssize_t ss; | |
2019 | ||
2020 | assert(e); | |
da7e457c | 2021 | assert(fd >= 0); |
72aedc1e | 2022 | |
305f78bf | 2023 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2024 | |
2025 | ss = read(fd, &x, sizeof(x)); | |
2026 | if (ss < 0) { | |
2027 | if (errno == EAGAIN || errno == EINTR) | |
2028 | return 0; | |
2029 | ||
2030 | return -errno; | |
2031 | } | |
2032 | ||
8d35dae7 | 2033 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2034 | return -EIO; |
2035 | ||
cde93897 | 2036 | if (next) |
3a43da28 | 2037 | *next = USEC_INFINITY; |
72aedc1e | 2038 | |
fd38203a LP |
2039 | return 0; |
2040 | } | |
2041 | ||
305f78bf LP |
2042 | static int process_timer( |
2043 | sd_event *e, | |
2044 | usec_t n, | |
6a0f1f6d | 2045 | struct clock_data *d) { |
305f78bf | 2046 | |
fd38203a LP |
2047 | sd_event_source *s; |
2048 | int r; | |
2049 | ||
2050 | assert(e); | |
6a0f1f6d | 2051 | assert(d); |
fd38203a LP |
2052 | |
2053 | for (;;) { | |
6a0f1f6d | 2054 | s = prioq_peek(d->earliest); |
fd38203a LP |
2055 | if (!s || |
2056 | s->time.next > n || | |
baf76283 | 2057 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2058 | s->pending) |
2059 | break; | |
2060 | ||
2061 | r = source_set_pending(s, true); | |
2062 | if (r < 0) | |
2063 | return r; | |
2064 | ||
6a0f1f6d LP |
2065 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2066 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 2067 | d->needs_rearm = true; |
fd38203a LP |
2068 | } |
2069 | ||
2070 | return 0; | |
2071 | } | |
2072 | ||
2073 | static int process_child(sd_event *e) { | |
2074 | sd_event_source *s; | |
2075 | Iterator i; | |
2076 | int r; | |
2077 | ||
2078 | assert(e); | |
2079 | ||
c2ba3ad6 LP |
2080 | e->need_process_child = false; |
2081 | ||
fd38203a LP |
2082 | /* |
2083 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2084 | + WNOHANG for each PID we wait for, instead of using | |
2085 | P_ALL. This is because we only want to get child | |
2086 | information of very specific child processes, and not all | |
2087 | of them. We might not have processed the SIGCHLD even of a | |
2088 | previous invocation and we don't want to maintain a | |
2089 | unbounded *per-child* event queue, hence we really don't | |
2090 | want anything flushed out of the kernel's queue that we | |
2091 | don't care about. Since this is O(n) this means that if you | |
2092 | have a lot of processes you probably want to handle SIGCHLD | |
2093 | yourself. | |
08cd1552 LP |
2094 | |
2095 | We do not reap the children here (by using WNOWAIT), this | |
2096 | is only done after the event source is dispatched so that | |
2097 | the callback still sees the process as a zombie. | |
fd38203a LP |
2098 | */ |
2099 | ||
2100 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2101 | assert(s->type == SOURCE_CHILD); | |
2102 | ||
2103 | if (s->pending) | |
2104 | continue; | |
2105 | ||
baf76283 | 2106 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2107 | continue; |
2108 | ||
2109 | zero(s->child.siginfo); | |
08cd1552 LP |
2110 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2111 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
2112 | if (r < 0) |
2113 | return -errno; | |
2114 | ||
2115 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
2116 | bool zombie = |
2117 | s->child.siginfo.si_code == CLD_EXITED || | |
2118 | s->child.siginfo.si_code == CLD_KILLED || | |
2119 | s->child.siginfo.si_code == CLD_DUMPED; | |
2120 | ||
2121 | if (!zombie && (s->child.options & WEXITED)) { | |
2122 | /* If the child isn't dead then let's | |
2123 | * immediately remove the state change | |
2124 | * from the queue, since there's no | |
2125 | * benefit in leaving it queued */ | |
2126 | ||
2127 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2128 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2129 | } | |
2130 | ||
fd38203a LP |
2131 | r = source_set_pending(s, true); |
2132 | if (r < 0) | |
2133 | return r; | |
2134 | } | |
2135 | } | |
2136 | ||
fd38203a LP |
2137 | return 0; |
2138 | } | |
2139 | ||
9da4cb2b | 2140 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2141 | bool read_one = false; |
fd38203a LP |
2142 | int r; |
2143 | ||
da7e457c | 2144 | assert(e); |
305f78bf | 2145 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2146 | |
9da4cb2b LP |
2147 | /* If there's a signal queued on this priority and SIGCHLD is |
2148 | on this priority too, then make sure to recheck the | |
2149 | children we watch. This is because we only ever dequeue | |
2150 | the first signal per priority, and if we dequeue one, and | |
2151 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2152 | might have higher priority children we care about hence we | |
2153 | need to check that explicitly. */ | |
2154 | ||
2155 | if (sigismember(&d->sigset, SIGCHLD)) | |
2156 | e->need_process_child = true; | |
2157 | ||
2158 | /* If there's already an event source pending for this | |
2159 | * priority we don't read another */ | |
2160 | if (d->current) | |
2161 | return 0; | |
2162 | ||
fd38203a | 2163 | for (;;) { |
0eb2e0e3 | 2164 | struct signalfd_siginfo si; |
7057bd99 | 2165 | ssize_t n; |
92daebc0 | 2166 | sd_event_source *s = NULL; |
fd38203a | 2167 | |
9da4cb2b | 2168 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 2169 | if (n < 0) { |
fd38203a LP |
2170 | if (errno == EAGAIN || errno == EINTR) |
2171 | return read_one; | |
2172 | ||
2173 | return -errno; | |
2174 | } | |
2175 | ||
7057bd99 | 2176 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2177 | return -EIO; |
2178 | ||
7057bd99 ZJS |
2179 | assert(si.ssi_signo < _NSIG); |
2180 | ||
fd38203a LP |
2181 | read_one = true; |
2182 | ||
92daebc0 LP |
2183 | if (e->signal_sources) |
2184 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
2185 | if (!s) |
2186 | continue; | |
9da4cb2b LP |
2187 | if (s->pending) |
2188 | continue; | |
fd38203a LP |
2189 | |
2190 | s->signal.siginfo = si; | |
9da4cb2b LP |
2191 | d->current = s; |
2192 | ||
fd38203a LP |
2193 | r = source_set_pending(s, true); |
2194 | if (r < 0) | |
2195 | return r; | |
9da4cb2b LP |
2196 | |
2197 | return 1; | |
fd38203a | 2198 | } |
fd38203a LP |
2199 | } |
2200 | ||
2201 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 2202 | int r = 0; |
fd38203a LP |
2203 | |
2204 | assert(s); | |
6203e07a | 2205 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2206 | |
6203e07a | 2207 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
2208 | r = source_set_pending(s, false); |
2209 | if (r < 0) | |
2210 | return r; | |
2211 | } | |
fd38203a | 2212 | |
6e9feda3 LP |
2213 | if (s->type != SOURCE_POST) { |
2214 | sd_event_source *z; | |
2215 | Iterator i; | |
2216 | ||
2217 | /* If we execute a non-post source, let's mark all | |
2218 | * post sources as pending */ | |
2219 | ||
2220 | SET_FOREACH(z, s->event->post_sources, i) { | |
2221 | if (z->enabled == SD_EVENT_OFF) | |
2222 | continue; | |
2223 | ||
2224 | r = source_set_pending(z, true); | |
2225 | if (r < 0) | |
2226 | return r; | |
2227 | } | |
2228 | } | |
2229 | ||
baf76283 LP |
2230 | if (s->enabled == SD_EVENT_ONESHOT) { |
2231 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2232 | if (r < 0) |
2233 | return r; | |
2234 | } | |
2235 | ||
12179984 | 2236 | s->dispatching = true; |
b7484e2a | 2237 | |
fd38203a LP |
2238 | switch (s->type) { |
2239 | ||
2240 | case SOURCE_IO: | |
2241 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2242 | break; | |
2243 | ||
6a0f1f6d | 2244 | case SOURCE_TIME_REALTIME: |
a8548816 | 2245 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2246 | case SOURCE_TIME_MONOTONIC: |
2247 | case SOURCE_TIME_REALTIME_ALARM: | |
2248 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2249 | r = s->time.callback(s, s->time.next, s->userdata); |
2250 | break; | |
2251 | ||
2252 | case SOURCE_SIGNAL: | |
2253 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2254 | break; | |
2255 | ||
08cd1552 LP |
2256 | case SOURCE_CHILD: { |
2257 | bool zombie; | |
2258 | ||
2259 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
2260 | s->child.siginfo.si_code == CLD_KILLED || | |
2261 | s->child.siginfo.si_code == CLD_DUMPED; | |
2262 | ||
fd38203a | 2263 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2264 | |
2265 | /* Now, reap the PID for good. */ | |
2266 | if (zombie) | |
2267 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2268 | ||
fd38203a | 2269 | break; |
08cd1552 | 2270 | } |
fd38203a LP |
2271 | |
2272 | case SOURCE_DEFER: | |
2273 | r = s->defer.callback(s, s->userdata); | |
2274 | break; | |
da7e457c | 2275 | |
6e9feda3 LP |
2276 | case SOURCE_POST: |
2277 | r = s->post.callback(s, s->userdata); | |
2278 | break; | |
2279 | ||
6203e07a LP |
2280 | case SOURCE_EXIT: |
2281 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2282 | break; |
9d3e3aa5 LP |
2283 | |
2284 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2285 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2286 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2287 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2288 | } |
2289 | ||
12179984 LP |
2290 | s->dispatching = false; |
2291 | ||
752bbf75 | 2292 | if (r < 0) { |
356779df | 2293 | if (s->description) |
da927ba9 | 2294 | log_debug_errno(r, "Event source '%s' returned error, disabling: %m", s->description); |
752bbf75 | 2295 | else |
da927ba9 | 2296 | log_debug_errno(r, "Event source %p returned error, disabling: %m", s); |
752bbf75 | 2297 | } |
12179984 LP |
2298 | |
2299 | if (s->n_ref == 0) | |
2300 | source_free(s); | |
2301 | else if (r < 0) | |
6203e07a | 2302 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2303 | |
6203e07a | 2304 | return 1; |
fd38203a LP |
2305 | } |
2306 | ||
2307 | static int event_prepare(sd_event *e) { | |
2308 | int r; | |
2309 | ||
2310 | assert(e); | |
2311 | ||
2312 | for (;;) { | |
2313 | sd_event_source *s; | |
2314 | ||
2315 | s = prioq_peek(e->prepare); | |
baf76283 | 2316 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2317 | break; |
2318 | ||
2319 | s->prepare_iteration = e->iteration; | |
2320 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2321 | if (r < 0) | |
2322 | return r; | |
2323 | ||
2324 | assert(s->prepare); | |
12179984 LP |
2325 | |
2326 | s->dispatching = true; | |
fd38203a | 2327 | r = s->prepare(s, s->userdata); |
12179984 LP |
2328 | s->dispatching = false; |
2329 | ||
752bbf75 | 2330 | if (r < 0) { |
356779df | 2331 | if (s->description) |
da927ba9 | 2332 | log_debug_errno(r, "Prepare callback of event source '%s' returned error, disabling: %m", s->description); |
752bbf75 | 2333 | else |
da927ba9 | 2334 | log_debug_errno(r, "Prepare callback of event source %p returned error, disabling: %m", s); |
752bbf75 | 2335 | } |
fd38203a | 2336 | |
12179984 LP |
2337 | if (s->n_ref == 0) |
2338 | source_free(s); | |
2339 | else if (r < 0) | |
2340 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2341 | } |
2342 | ||
2343 | return 0; | |
2344 | } | |
2345 | ||
6203e07a | 2346 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2347 | sd_event_source *p; |
2348 | int r; | |
2349 | ||
2350 | assert(e); | |
2351 | ||
6203e07a | 2352 | p = prioq_peek(e->exit); |
baf76283 | 2353 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2354 | e->state = SD_EVENT_FINISHED; |
2355 | return 0; | |
2356 | } | |
2357 | ||
2358 | sd_event_ref(e); | |
2359 | e->iteration++; | |
6203e07a | 2360 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2361 | |
2362 | r = source_dispatch(p); | |
2363 | ||
2b0c9ef7 | 2364 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2365 | sd_event_unref(e); |
2366 | ||
2367 | return r; | |
2368 | } | |
2369 | ||
c2ba3ad6 LP |
2370 | static sd_event_source* event_next_pending(sd_event *e) { |
2371 | sd_event_source *p; | |
2372 | ||
da7e457c LP |
2373 | assert(e); |
2374 | ||
c2ba3ad6 LP |
2375 | p = prioq_peek(e->pending); |
2376 | if (!p) | |
2377 | return NULL; | |
2378 | ||
baf76283 | 2379 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2380 | return NULL; |
2381 | ||
2382 | return p; | |
2383 | } | |
2384 | ||
cde93897 LP |
2385 | static int arm_watchdog(sd_event *e) { |
2386 | struct itimerspec its = {}; | |
2387 | usec_t t; | |
2388 | int r; | |
2389 | ||
2390 | assert(e); | |
2391 | assert(e->watchdog_fd >= 0); | |
2392 | ||
2393 | t = sleep_between(e, | |
2394 | e->watchdog_last + (e->watchdog_period / 2), | |
2395 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2396 | ||
2397 | timespec_store(&its.it_value, t); | |
2398 | ||
75145780 LP |
2399 | /* Make sure we never set the watchdog to 0, which tells the |
2400 | * kernel to disable it. */ | |
2401 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2402 | its.it_value.tv_nsec = 1; | |
2403 | ||
cde93897 LP |
2404 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2405 | if (r < 0) | |
2406 | return -errno; | |
2407 | ||
2408 | return 0; | |
2409 | } | |
2410 | ||
2411 | static int process_watchdog(sd_event *e) { | |
2412 | assert(e); | |
2413 | ||
2414 | if (!e->watchdog) | |
2415 | return 0; | |
2416 | ||
2417 | /* Don't notify watchdog too often */ | |
2418 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2419 | return 0; | |
2420 | ||
2421 | sd_notify(false, "WATCHDOG=1"); | |
2422 | e->watchdog_last = e->timestamp.monotonic; | |
2423 | ||
2424 | return arm_watchdog(e); | |
2425 | } | |
2426 | ||
c45a5a74 TG |
2427 | _public_ int sd_event_prepare(sd_event *e) { |
2428 | int r; | |
fd38203a | 2429 | |
da7e457c LP |
2430 | assert_return(e, -EINVAL); |
2431 | assert_return(!event_pid_changed(e), -ECHILD); | |
2432 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2433 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 2434 | |
6203e07a | 2435 | if (e->exit_requested) |
c45a5a74 | 2436 | goto pending; |
fd38203a LP |
2437 | |
2438 | e->iteration++; | |
2439 | ||
2440 | r = event_prepare(e); | |
2441 | if (r < 0) | |
c45a5a74 | 2442 | return r; |
fd38203a | 2443 | |
6a0f1f6d LP |
2444 | r = event_arm_timer(e, &e->realtime); |
2445 | if (r < 0) | |
c45a5a74 | 2446 | return r; |
6a0f1f6d | 2447 | |
a8548816 TG |
2448 | r = event_arm_timer(e, &e->boottime); |
2449 | if (r < 0) | |
c45a5a74 | 2450 | return r; |
a8548816 | 2451 | |
6a0f1f6d LP |
2452 | r = event_arm_timer(e, &e->monotonic); |
2453 | if (r < 0) | |
c45a5a74 | 2454 | return r; |
6a0f1f6d LP |
2455 | |
2456 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 2457 | if (r < 0) |
c45a5a74 | 2458 | return r; |
fd38203a | 2459 | |
6a0f1f6d | 2460 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 2461 | if (r < 0) |
c45a5a74 | 2462 | return r; |
fd38203a | 2463 | |
1b5995b0 | 2464 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
2465 | goto pending; |
2466 | ||
2b0c9ef7 | 2467 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
2468 | |
2469 | return 0; | |
2470 | ||
2471 | pending: | |
2b0c9ef7 | 2472 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2473 | r = sd_event_wait(e, 0); |
2474 | if (r == 0) | |
2b0c9ef7 | 2475 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2476 | |
2477 | return r; | |
c45a5a74 TG |
2478 | } |
2479 | ||
2480 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2481 | struct epoll_event *ev_queue; | |
2482 | unsigned ev_queue_max; | |
2483 | int r, m, i; | |
2484 | ||
2485 | assert_return(e, -EINVAL); | |
2486 | assert_return(!event_pid_changed(e), -ECHILD); | |
2487 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2488 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
2489 | |
2490 | if (e->exit_requested) { | |
2491 | e->state = SD_EVENT_PENDING; | |
2492 | return 1; | |
2493 | } | |
6a0f1f6d | 2494 | |
1c724e9e | 2495 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 2496 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 2497 | |
15b38f93 | 2498 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2499 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2500 | if (m < 0) { |
c45a5a74 TG |
2501 | if (errno == EINTR) { |
2502 | e->state = SD_EVENT_PENDING; | |
2503 | return 1; | |
2504 | } | |
2505 | ||
2506 | r = -errno; | |
da7e457c LP |
2507 | goto finish; |
2508 | } | |
fd38203a | 2509 | |
46e8c825 | 2510 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2511 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2512 | |
2513 | for (i = 0; i < m; i++) { | |
2514 | ||
9da4cb2b | 2515 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2516 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
9da4cb2b LP |
2517 | else { |
2518 | WakeupType *t = ev_queue[i].data.ptr; | |
2519 | ||
2520 | switch (*t) { | |
2521 | ||
2522 | case WAKEUP_EVENT_SOURCE: | |
2523 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2524 | break; | |
fd38203a | 2525 | |
9da4cb2b LP |
2526 | case WAKEUP_CLOCK_DATA: { |
2527 | struct clock_data *d = ev_queue[i].data.ptr; | |
2528 | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); | |
2529 | break; | |
2530 | } | |
2531 | ||
2532 | case WAKEUP_SIGNAL_DATA: | |
2533 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2534 | break; | |
2535 | ||
2536 | default: | |
2537 | assert_not_reached("Invalid wake-up pointer"); | |
2538 | } | |
2539 | } | |
fd38203a | 2540 | if (r < 0) |
da7e457c | 2541 | goto finish; |
fd38203a LP |
2542 | } |
2543 | ||
cde93897 LP |
2544 | r = process_watchdog(e); |
2545 | if (r < 0) | |
2546 | goto finish; | |
2547 | ||
6a0f1f6d LP |
2548 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2549 | if (r < 0) | |
2550 | goto finish; | |
2551 | ||
a8548816 TG |
2552 | r = process_timer(e, e->timestamp_boottime, &e->boottime); |
2553 | if (r < 0) | |
2554 | goto finish; | |
2555 | ||
6a0f1f6d LP |
2556 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2557 | if (r < 0) | |
2558 | goto finish; | |
2559 | ||
2560 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2561 | if (r < 0) |
da7e457c | 2562 | goto finish; |
fd38203a | 2563 | |
6a0f1f6d | 2564 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2565 | if (r < 0) |
da7e457c | 2566 | goto finish; |
fd38203a | 2567 | |
c2ba3ad6 | 2568 | if (e->need_process_child) { |
fd38203a LP |
2569 | r = process_child(e); |
2570 | if (r < 0) | |
da7e457c | 2571 | goto finish; |
fd38203a LP |
2572 | } |
2573 | ||
c45a5a74 TG |
2574 | if (event_next_pending(e)) { |
2575 | e->state = SD_EVENT_PENDING; | |
2576 | ||
2577 | return 1; | |
da7e457c LP |
2578 | } |
2579 | ||
c45a5a74 | 2580 | r = 0; |
fd38203a | 2581 | |
da7e457c | 2582 | finish: |
2b0c9ef7 | 2583 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2584 | |
2585 | return r; | |
fd38203a LP |
2586 | } |
2587 | ||
c45a5a74 TG |
2588 | _public_ int sd_event_dispatch(sd_event *e) { |
2589 | sd_event_source *p; | |
2590 | int r; | |
2591 | ||
2592 | assert_return(e, -EINVAL); | |
2593 | assert_return(!event_pid_changed(e), -ECHILD); | |
2594 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2595 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
2596 | ||
2597 | if (e->exit_requested) | |
2598 | return dispatch_exit(e); | |
2599 | ||
2600 | p = event_next_pending(e); | |
2601 | if (p) { | |
2602 | sd_event_ref(e); | |
2603 | ||
2604 | e->state = SD_EVENT_RUNNING; | |
2605 | r = source_dispatch(p); | |
2b0c9ef7 | 2606 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2607 | |
2608 | sd_event_unref(e); | |
2609 | ||
2610 | return r; | |
2611 | } | |
2612 | ||
2b0c9ef7 | 2613 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2614 | |
2615 | return 1; | |
2616 | } | |
2617 | ||
2618 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { | |
2619 | int r; | |
2620 | ||
2621 | assert_return(e, -EINVAL); | |
2622 | assert_return(!event_pid_changed(e), -ECHILD); | |
2623 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2624 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 TG |
2625 | |
2626 | r = sd_event_prepare(e); | |
53bac4e0 LP |
2627 | if (r == 0) |
2628 | /* There was nothing? Then wait... */ | |
2629 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 2630 | |
02d30981 | 2631 | if (r > 0) { |
53bac4e0 | 2632 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
2633 | r = sd_event_dispatch(e); |
2634 | if (r < 0) | |
2635 | return r; | |
53bac4e0 LP |
2636 | |
2637 | return 1; | |
2638 | } | |
2639 | ||
2640 | return r; | |
c45a5a74 TG |
2641 | } |
2642 | ||
f7262a9f | 2643 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2644 | int r; |
2645 | ||
da7e457c LP |
2646 | assert_return(e, -EINVAL); |
2647 | assert_return(!event_pid_changed(e), -ECHILD); | |
2b0c9ef7 | 2648 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c LP |
2649 | |
2650 | sd_event_ref(e); | |
fd38203a | 2651 | |
da7e457c | 2652 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2653 | r = sd_event_run(e, (uint64_t) -1); |
2654 | if (r < 0) | |
da7e457c | 2655 | goto finish; |
fd38203a LP |
2656 | } |
2657 | ||
6203e07a | 2658 | r = e->exit_code; |
da7e457c LP |
2659 | |
2660 | finish: | |
2661 | sd_event_unref(e); | |
2662 | return r; | |
fd38203a LP |
2663 | } |
2664 | ||
9b364545 TG |
2665 | _public_ int sd_event_get_fd(sd_event *e) { |
2666 | ||
2667 | assert_return(e, -EINVAL); | |
2668 | assert_return(!event_pid_changed(e), -ECHILD); | |
2669 | ||
2670 | return e->epoll_fd; | |
2671 | } | |
2672 | ||
f7262a9f | 2673 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2674 | assert_return(e, -EINVAL); |
2675 | assert_return(!event_pid_changed(e), -ECHILD); | |
2676 | ||
2677 | return e->state; | |
2678 | } | |
2679 | ||
6203e07a | 2680 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2681 | assert_return(e, -EINVAL); |
6203e07a | 2682 | assert_return(code, -EINVAL); |
da7e457c | 2683 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2684 | |
6203e07a LP |
2685 | if (!e->exit_requested) |
2686 | return -ENODATA; | |
2687 | ||
2688 | *code = e->exit_code; | |
2689 | return 0; | |
fd38203a LP |
2690 | } |
2691 | ||
6203e07a | 2692 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2693 | assert_return(e, -EINVAL); |
2694 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2695 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2696 | |
6203e07a LP |
2697 | e->exit_requested = true; |
2698 | e->exit_code = code; | |
2699 | ||
fd38203a LP |
2700 | return 0; |
2701 | } | |
46e8c825 | 2702 | |
6a0f1f6d | 2703 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2704 | assert_return(e, -EINVAL); |
2705 | assert_return(usec, -EINVAL); | |
46e8c825 LP |
2706 | assert_return(!event_pid_changed(e), -ECHILD); |
2707 | ||
38a03f06 LP |
2708 | if (!dual_timestamp_is_set(&e->timestamp)) { |
2709 | /* Implicitly fall back to now() if we never ran | |
2710 | * before and thus have no cached time. */ | |
2711 | *usec = now(clock); | |
2712 | return 1; | |
2713 | } | |
46e8c825 | 2714 | |
6a0f1f6d LP |
2715 | switch (clock) { |
2716 | ||
2717 | case CLOCK_REALTIME: | |
2718 | case CLOCK_REALTIME_ALARM: | |
2719 | *usec = e->timestamp.realtime; | |
2720 | break; | |
2721 | ||
2722 | case CLOCK_MONOTONIC: | |
2723 | *usec = e->timestamp.monotonic; | |
2724 | break; | |
2725 | ||
a8548816 | 2726 | case CLOCK_BOOTTIME: |
6a0f1f6d LP |
2727 | case CLOCK_BOOTTIME_ALARM: |
2728 | *usec = e->timestamp_boottime; | |
2729 | break; | |
2730 | } | |
46e8c825 | 2731 | |
46e8c825 LP |
2732 | return 0; |
2733 | } | |
afc6adb5 LP |
2734 | |
2735 | _public_ int sd_event_default(sd_event **ret) { | |
2736 | ||
ec202eae | 2737 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2738 | sd_event *e = NULL; |
afc6adb5 LP |
2739 | int r; |
2740 | ||
2741 | if (!ret) | |
2742 | return !!default_event; | |
2743 | ||
2744 | if (default_event) { | |
2745 | *ret = sd_event_ref(default_event); | |
2746 | return 0; | |
2747 | } | |
2748 | ||
2749 | r = sd_event_new(&e); | |
2750 | if (r < 0) | |
2751 | return r; | |
2752 | ||
2753 | e->default_event_ptr = &default_event; | |
2754 | e->tid = gettid(); | |
2755 | default_event = e; | |
2756 | ||
2757 | *ret = e; | |
2758 | return 1; | |
2759 | } | |
2760 | ||
2761 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2762 | assert_return(e, -EINVAL); | |
2763 | assert_return(tid, -EINVAL); | |
76b54375 | 2764 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2765 | |
76b54375 LP |
2766 | if (e->tid != 0) { |
2767 | *tid = e->tid; | |
2768 | return 0; | |
2769 | } | |
2770 | ||
2771 | return -ENXIO; | |
afc6adb5 | 2772 | } |
cde93897 LP |
2773 | |
2774 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2775 | int r; | |
2776 | ||
2777 | assert_return(e, -EINVAL); | |
8f726607 | 2778 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2779 | |
2780 | if (e->watchdog == !!b) | |
2781 | return e->watchdog; | |
2782 | ||
2783 | if (b) { | |
2784 | struct epoll_event ev = {}; | |
cde93897 | 2785 | |
09812eb7 LP |
2786 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2787 | if (r <= 0) | |
cde93897 | 2788 | return r; |
cde93897 LP |
2789 | |
2790 | /* Issue first ping immediately */ | |
2791 | sd_notify(false, "WATCHDOG=1"); | |
2792 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2793 | ||
2794 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2795 | if (e->watchdog_fd < 0) | |
2796 | return -errno; | |
2797 | ||
2798 | r = arm_watchdog(e); | |
2799 | if (r < 0) | |
2800 | goto fail; | |
2801 | ||
2802 | ev.events = EPOLLIN; | |
2803 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2804 | ||
2805 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2806 | if (r < 0) { | |
2807 | r = -errno; | |
2808 | goto fail; | |
2809 | } | |
2810 | ||
2811 | } else { | |
2812 | if (e->watchdog_fd >= 0) { | |
2813 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2814 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2815 | } |
2816 | } | |
2817 | ||
2818 | e->watchdog = !!b; | |
2819 | return e->watchdog; | |
2820 | ||
2821 | fail: | |
03e334a1 | 2822 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2823 | return r; |
2824 | } | |
8f726607 LP |
2825 | |
2826 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2827 | assert_return(e, -EINVAL); | |
2828 | assert_return(!event_pid_changed(e), -ECHILD); | |
2829 | ||
2830 | return e->watchdog; | |
2831 | } |