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