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fd38203a LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/epoll.h> | |
23 | #include <sys/timerfd.h> | |
24 | #include <sys/wait.h> | |
25 | ||
cde93897 | 26 | #include "sd-daemon.h" |
07630cea LP |
27 | #include "sd-event.h" |
28 | #include "sd-id128.h" | |
29 | ||
b5efdb8a | 30 | #include "alloc-util.h" |
3ffd4af2 | 31 | #include "fd-util.h" |
fd38203a | 32 | #include "hashmap.h" |
07630cea LP |
33 | #include "list.h" |
34 | #include "macro.h" | |
afc6adb5 | 35 | #include "missing.h" |
07630cea | 36 | #include "prioq.h" |
4a0b58c4 | 37 | #include "process-util.h" |
6e9feda3 | 38 | #include "set.h" |
24882e06 | 39 | #include "signal-util.h" |
55cbfaa5 | 40 | #include "string-table.h" |
07630cea LP |
41 | #include "string-util.h" |
42 | #include "time-util.h" | |
43 | #include "util.h" | |
fd38203a | 44 | |
c2ba3ad6 | 45 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
46 | |
47 | typedef enum EventSourceType { | |
48 | SOURCE_IO, | |
6a0f1f6d | 49 | SOURCE_TIME_REALTIME, |
a8548816 | 50 | SOURCE_TIME_BOOTTIME, |
6a0f1f6d LP |
51 | SOURCE_TIME_MONOTONIC, |
52 | SOURCE_TIME_REALTIME_ALARM, | |
53 | SOURCE_TIME_BOOTTIME_ALARM, | |
fd38203a LP |
54 | SOURCE_SIGNAL, |
55 | SOURCE_CHILD, | |
da7e457c | 56 | SOURCE_DEFER, |
6e9feda3 | 57 | SOURCE_POST, |
6203e07a | 58 | SOURCE_EXIT, |
6a0f1f6d | 59 | SOURCE_WATCHDOG, |
a71fe8b8 | 60 | _SOURCE_EVENT_SOURCE_TYPE_MAX, |
6a0f1f6d | 61 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 |
fd38203a LP |
62 | } EventSourceType; |
63 | ||
55cbfaa5 DM |
64 | static const char* const event_source_type_table[_SOURCE_EVENT_SOURCE_TYPE_MAX] = { |
65 | [SOURCE_IO] = "io", | |
66 | [SOURCE_TIME_REALTIME] = "realtime", | |
67 | [SOURCE_TIME_BOOTTIME] = "bootime", | |
68 | [SOURCE_TIME_MONOTONIC] = "monotonic", | |
69 | [SOURCE_TIME_REALTIME_ALARM] = "realtime-alarm", | |
70 | [SOURCE_TIME_BOOTTIME_ALARM] = "boottime-alarm", | |
71 | [SOURCE_SIGNAL] = "signal", | |
72 | [SOURCE_CHILD] = "child", | |
73 | [SOURCE_DEFER] = "defer", | |
74 | [SOURCE_POST] = "post", | |
75 | [SOURCE_EXIT] = "exit", | |
76 | [SOURCE_WATCHDOG] = "watchdog", | |
77 | }; | |
78 | ||
79 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(event_source_type, int); | |
80 | ||
9da4cb2b LP |
81 | /* All objects we use in epoll events start with this value, so that |
82 | * we know how to dispatch it */ | |
83 | typedef enum WakeupType { | |
84 | WAKEUP_NONE, | |
85 | WAKEUP_EVENT_SOURCE, | |
86 | WAKEUP_CLOCK_DATA, | |
87 | WAKEUP_SIGNAL_DATA, | |
88 | _WAKEUP_TYPE_MAX, | |
89 | _WAKEUP_TYPE_INVALID = -1, | |
90 | } WakeupType; | |
91 | ||
a8548816 | 92 | #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 | 93 | |
fd38203a | 94 | struct sd_event_source { |
9da4cb2b LP |
95 | WakeupType wakeup; |
96 | ||
da7e457c | 97 | unsigned n_ref; |
fd38203a LP |
98 | |
99 | sd_event *event; | |
100 | void *userdata; | |
718db961 | 101 | sd_event_handler_t prepare; |
fd38203a | 102 | |
356779df | 103 | char *description; |
f7f53e9e | 104 | |
6a0f1f6d | 105 | EventSourceType type:5; |
baf76283 | 106 | int enabled:3; |
fd38203a | 107 | bool pending:1; |
12179984 | 108 | bool dispatching:1; |
a71fe8b8 | 109 | bool floating:1; |
fd38203a | 110 | |
31927c16 | 111 | int64_t priority; |
fd38203a LP |
112 | unsigned pending_index; |
113 | unsigned prepare_index; | |
114 | unsigned pending_iteration; | |
115 | unsigned prepare_iteration; | |
116 | ||
a71fe8b8 LP |
117 | LIST_FIELDS(sd_event_source, sources); |
118 | ||
fd38203a LP |
119 | union { |
120 | struct { | |
718db961 | 121 | sd_event_io_handler_t callback; |
fd38203a LP |
122 | int fd; |
123 | uint32_t events; | |
124 | uint32_t revents; | |
125 | bool registered:1; | |
126 | } io; | |
127 | struct { | |
718db961 | 128 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
129 | usec_t next, accuracy; |
130 | unsigned earliest_index; | |
131 | unsigned latest_index; | |
fd38203a LP |
132 | } time; |
133 | struct { | |
718db961 | 134 | sd_event_signal_handler_t callback; |
fd38203a LP |
135 | struct signalfd_siginfo siginfo; |
136 | int sig; | |
137 | } signal; | |
138 | struct { | |
718db961 | 139 | sd_event_child_handler_t callback; |
fd38203a LP |
140 | siginfo_t siginfo; |
141 | pid_t pid; | |
142 | int options; | |
143 | } child; | |
144 | struct { | |
718db961 | 145 | sd_event_handler_t callback; |
fd38203a | 146 | } defer; |
6e9feda3 LP |
147 | struct { |
148 | sd_event_handler_t callback; | |
149 | } post; | |
da7e457c | 150 | struct { |
718db961 | 151 | sd_event_handler_t callback; |
da7e457c | 152 | unsigned prioq_index; |
6203e07a | 153 | } exit; |
fd38203a LP |
154 | }; |
155 | }; | |
156 | ||
6a0f1f6d | 157 | struct clock_data { |
9da4cb2b | 158 | WakeupType wakeup; |
6a0f1f6d LP |
159 | int fd; |
160 | ||
161 | /* For all clocks we maintain two priority queues each, one | |
162 | * ordered for the earliest times the events may be | |
163 | * dispatched, and one ordered by the latest times they must | |
164 | * have been dispatched. The range between the top entries in | |
165 | * the two prioqs is the time window we can freely schedule | |
166 | * wakeups in */ | |
167 | ||
168 | Prioq *earliest; | |
169 | Prioq *latest; | |
170 | usec_t next; | |
212bbb17 TG |
171 | |
172 | bool needs_rearm:1; | |
6a0f1f6d LP |
173 | }; |
174 | ||
9da4cb2b LP |
175 | struct signal_data { |
176 | WakeupType wakeup; | |
177 | ||
178 | /* For each priority we maintain one signal fd, so that we | |
179 | * only have to dequeue a single event per priority at a | |
180 | * time. */ | |
181 | ||
182 | int fd; | |
183 | int64_t priority; | |
184 | sigset_t sigset; | |
185 | sd_event_source *current; | |
186 | }; | |
187 | ||
fd38203a | 188 | struct sd_event { |
da7e457c | 189 | unsigned n_ref; |
fd38203a LP |
190 | |
191 | int epoll_fd; | |
cde93897 | 192 | int watchdog_fd; |
fd38203a LP |
193 | |
194 | Prioq *pending; | |
195 | Prioq *prepare; | |
c2ba3ad6 | 196 | |
a8548816 | 197 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
198 | * can add support for more clocks when the kernel learns to |
199 | * deal with them, too. */ | |
200 | struct clock_data realtime; | |
a8548816 | 201 | struct clock_data boottime; |
6a0f1f6d LP |
202 | struct clock_data monotonic; |
203 | struct clock_data realtime_alarm; | |
204 | struct clock_data boottime_alarm; | |
fd38203a | 205 | |
da7e457c LP |
206 | usec_t perturb; |
207 | ||
9da4cb2b LP |
208 | sd_event_source **signal_sources; /* indexed by signal number */ |
209 | Hashmap *signal_data; /* indexed by priority */ | |
fd38203a LP |
210 | |
211 | Hashmap *child_sources; | |
baf76283 | 212 | unsigned n_enabled_child_sources; |
fd38203a | 213 | |
6e9feda3 LP |
214 | Set *post_sources; |
215 | ||
6203e07a | 216 | Prioq *exit; |
fd38203a | 217 | |
da7e457c | 218 | pid_t original_pid; |
c2ba3ad6 | 219 | |
da7e457c | 220 | unsigned iteration; |
46e8c825 | 221 | dual_timestamp timestamp; |
6a0f1f6d | 222 | usec_t timestamp_boottime; |
da7e457c | 223 | int state; |
eaa3cbef | 224 | |
6203e07a | 225 | bool exit_requested:1; |
da7e457c | 226 | bool need_process_child:1; |
cde93897 | 227 | bool watchdog:1; |
afc6adb5 | 228 | |
6203e07a LP |
229 | int exit_code; |
230 | ||
afc6adb5 LP |
231 | pid_t tid; |
232 | sd_event **default_event_ptr; | |
cde93897 LP |
233 | |
234 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
235 | |
236 | unsigned n_sources; | |
a71fe8b8 LP |
237 | |
238 | LIST_HEAD(sd_event_source, sources); | |
fd38203a LP |
239 | }; |
240 | ||
a71fe8b8 LP |
241 | static void source_disconnect(sd_event_source *s); |
242 | ||
fd38203a LP |
243 | static int pending_prioq_compare(const void *a, const void *b) { |
244 | const sd_event_source *x = a, *y = b; | |
245 | ||
246 | assert(x->pending); | |
247 | assert(y->pending); | |
248 | ||
baf76283 LP |
249 | /* Enabled ones first */ |
250 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 251 | return -1; |
baf76283 | 252 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
253 | return 1; |
254 | ||
255 | /* Lower priority values first */ | |
256 | if (x->priority < y->priority) | |
257 | return -1; | |
258 | if (x->priority > y->priority) | |
259 | return 1; | |
260 | ||
261 | /* Older entries first */ | |
262 | if (x->pending_iteration < y->pending_iteration) | |
263 | return -1; | |
264 | if (x->pending_iteration > y->pending_iteration) | |
265 | return 1; | |
266 | ||
fd38203a LP |
267 | return 0; |
268 | } | |
269 | ||
270 | static int prepare_prioq_compare(const void *a, const void *b) { | |
271 | const sd_event_source *x = a, *y = b; | |
272 | ||
273 | assert(x->prepare); | |
274 | assert(y->prepare); | |
275 | ||
8046c457 KK |
276 | /* Enabled ones first */ |
277 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
278 | return -1; | |
279 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
280 | return 1; | |
281 | ||
fd38203a LP |
282 | /* Move most recently prepared ones last, so that we can stop |
283 | * preparing as soon as we hit one that has already been | |
284 | * prepared in the current iteration */ | |
285 | if (x->prepare_iteration < y->prepare_iteration) | |
286 | return -1; | |
287 | if (x->prepare_iteration > y->prepare_iteration) | |
288 | return 1; | |
289 | ||
fd38203a LP |
290 | /* Lower priority values first */ |
291 | if (x->priority < y->priority) | |
292 | return -1; | |
293 | if (x->priority > y->priority) | |
294 | return 1; | |
295 | ||
fd38203a LP |
296 | return 0; |
297 | } | |
298 | ||
c2ba3ad6 | 299 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
300 | const sd_event_source *x = a, *y = b; |
301 | ||
6a0f1f6d LP |
302 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
303 | assert(x->type == y->type); | |
fd38203a | 304 | |
baf76283 LP |
305 | /* Enabled ones first */ |
306 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 307 | return -1; |
baf76283 | 308 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
309 | return 1; |
310 | ||
311 | /* Move the pending ones to the end */ | |
312 | if (!x->pending && y->pending) | |
313 | return -1; | |
314 | if (x->pending && !y->pending) | |
315 | return 1; | |
316 | ||
317 | /* Order by time */ | |
318 | if (x->time.next < y->time.next) | |
319 | return -1; | |
320 | if (x->time.next > y->time.next) | |
a99badf5 | 321 | return 1; |
fd38203a | 322 | |
fd38203a LP |
323 | return 0; |
324 | } | |
325 | ||
c2ba3ad6 LP |
326 | static int latest_time_prioq_compare(const void *a, const void *b) { |
327 | const sd_event_source *x = a, *y = b; | |
328 | ||
6a0f1f6d LP |
329 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
330 | assert(x->type == y->type); | |
c2ba3ad6 | 331 | |
baf76283 LP |
332 | /* Enabled ones first */ |
333 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 334 | return -1; |
baf76283 | 335 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
336 | return 1; |
337 | ||
338 | /* Move the pending ones to the end */ | |
339 | if (!x->pending && y->pending) | |
340 | return -1; | |
341 | if (x->pending && !y->pending) | |
342 | return 1; | |
343 | ||
344 | /* Order by time */ | |
345 | if (x->time.next + x->time.accuracy < y->time.next + y->time.accuracy) | |
346 | return -1; | |
347 | if (x->time.next + x->time.accuracy > y->time.next + y->time.accuracy) | |
a99badf5 | 348 | return 1; |
c2ba3ad6 | 349 | |
c2ba3ad6 LP |
350 | return 0; |
351 | } | |
352 | ||
6203e07a | 353 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
354 | const sd_event_source *x = a, *y = b; |
355 | ||
6203e07a LP |
356 | assert(x->type == SOURCE_EXIT); |
357 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 358 | |
baf76283 LP |
359 | /* Enabled ones first */ |
360 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 361 | return -1; |
baf76283 | 362 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
363 | return 1; |
364 | ||
365 | /* Lower priority values first */ | |
366 | if (x->priority < y->priority) | |
367 | return -1; | |
368 | if (x->priority > y->priority) | |
369 | return 1; | |
370 | ||
da7e457c LP |
371 | return 0; |
372 | } | |
373 | ||
6a0f1f6d LP |
374 | static void free_clock_data(struct clock_data *d) { |
375 | assert(d); | |
9da4cb2b | 376 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
377 | |
378 | safe_close(d->fd); | |
379 | prioq_free(d->earliest); | |
380 | prioq_free(d->latest); | |
381 | } | |
382 | ||
fd38203a | 383 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
384 | sd_event_source *s; |
385 | ||
fd38203a | 386 | assert(e); |
a71fe8b8 LP |
387 | |
388 | while ((s = e->sources)) { | |
389 | assert(s->floating); | |
390 | source_disconnect(s); | |
391 | sd_event_source_unref(s); | |
392 | } | |
393 | ||
15b38f93 | 394 | assert(e->n_sources == 0); |
fd38203a | 395 | |
afc6adb5 LP |
396 | if (e->default_event_ptr) |
397 | *(e->default_event_ptr) = NULL; | |
398 | ||
03e334a1 | 399 | safe_close(e->epoll_fd); |
03e334a1 | 400 | safe_close(e->watchdog_fd); |
cde93897 | 401 | |
6a0f1f6d | 402 | free_clock_data(&e->realtime); |
a8548816 | 403 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
404 | free_clock_data(&e->monotonic); |
405 | free_clock_data(&e->realtime_alarm); | |
406 | free_clock_data(&e->boottime_alarm); | |
407 | ||
fd38203a LP |
408 | prioq_free(e->pending); |
409 | prioq_free(e->prepare); | |
6203e07a | 410 | prioq_free(e->exit); |
fd38203a LP |
411 | |
412 | free(e->signal_sources); | |
9da4cb2b | 413 | hashmap_free(e->signal_data); |
fd38203a LP |
414 | |
415 | hashmap_free(e->child_sources); | |
6e9feda3 | 416 | set_free(e->post_sources); |
fd38203a LP |
417 | free(e); |
418 | } | |
419 | ||
f7262a9f | 420 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
421 | sd_event *e; |
422 | int r; | |
423 | ||
305f78bf | 424 | assert_return(ret, -EINVAL); |
fd38203a LP |
425 | |
426 | e = new0(sd_event, 1); | |
427 | if (!e) | |
428 | return -ENOMEM; | |
429 | ||
da7e457c | 430 | e->n_ref = 1; |
9da4cb2b | 431 | 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 | 432 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
9da4cb2b | 433 | e->realtime.wakeup = e->boottime.wakeup = e->monotonic.wakeup = e->realtime_alarm.wakeup = e->boottime_alarm.wakeup = WAKEUP_CLOCK_DATA; |
eaa3cbef | 434 | e->original_pid = getpid(); |
3a43da28 | 435 | e->perturb = USEC_INFINITY; |
fd38203a | 436 | |
c983e776 EV |
437 | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
438 | if (r < 0) | |
fd38203a | 439 | goto fail; |
fd38203a LP |
440 | |
441 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
442 | if (e->epoll_fd < 0) { | |
443 | r = -errno; | |
444 | goto fail; | |
445 | } | |
446 | ||
447 | *ret = e; | |
448 | return 0; | |
449 | ||
450 | fail: | |
451 | event_free(e); | |
452 | return r; | |
453 | } | |
454 | ||
f7262a9f | 455 | _public_ sd_event* sd_event_ref(sd_event *e) { |
6680dd6b LP |
456 | |
457 | if (!e) | |
458 | return NULL; | |
fd38203a | 459 | |
da7e457c LP |
460 | assert(e->n_ref >= 1); |
461 | e->n_ref++; | |
fd38203a LP |
462 | |
463 | return e; | |
464 | } | |
465 | ||
f7262a9f | 466 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
467 | |
468 | if (!e) | |
469 | return NULL; | |
fd38203a | 470 | |
da7e457c LP |
471 | assert(e->n_ref >= 1); |
472 | e->n_ref--; | |
473 | ||
474 | if (e->n_ref <= 0) | |
fd38203a LP |
475 | event_free(e); |
476 | ||
477 | return NULL; | |
478 | } | |
479 | ||
eaa3cbef LP |
480 | static bool event_pid_changed(sd_event *e) { |
481 | assert(e); | |
482 | ||
a2360a46 | 483 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
484 | * it around over a fork(). Let's complain. */ |
485 | ||
486 | return e->original_pid != getpid(); | |
487 | } | |
488 | ||
366e6411 | 489 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
490 | int r; |
491 | ||
492 | assert(s); | |
493 | assert(s->type == SOURCE_IO); | |
494 | ||
f6806734 | 495 | if (event_pid_changed(s->event)) |
366e6411 | 496 | return; |
f6806734 | 497 | |
fd38203a | 498 | if (!s->io.registered) |
366e6411 | 499 | return; |
fd38203a LP |
500 | |
501 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
556c25cf | 502 | if (r < 0) |
55cbfaa5 DM |
503 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m", |
504 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a LP |
505 | |
506 | s->io.registered = false; | |
fd38203a LP |
507 | } |
508 | ||
305f78bf LP |
509 | static int source_io_register( |
510 | sd_event_source *s, | |
511 | int enabled, | |
512 | uint32_t events) { | |
513 | ||
fd38203a LP |
514 | struct epoll_event ev = {}; |
515 | int r; | |
516 | ||
517 | assert(s); | |
518 | assert(s->type == SOURCE_IO); | |
baf76283 | 519 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
520 | |
521 | ev.events = events; | |
522 | ev.data.ptr = s; | |
523 | ||
baf76283 | 524 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
525 | ev.events |= EPOLLONESHOT; |
526 | ||
527 | if (s->io.registered) | |
528 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
529 | else | |
530 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
fd38203a LP |
531 | if (r < 0) |
532 | return -errno; | |
533 | ||
534 | s->io.registered = true; | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
6a0f1f6d LP |
539 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
540 | ||
541 | switch (t) { | |
542 | ||
543 | case SOURCE_TIME_REALTIME: | |
544 | return CLOCK_REALTIME; | |
545 | ||
a8548816 TG |
546 | case SOURCE_TIME_BOOTTIME: |
547 | return CLOCK_BOOTTIME; | |
548 | ||
6a0f1f6d LP |
549 | case SOURCE_TIME_MONOTONIC: |
550 | return CLOCK_MONOTONIC; | |
551 | ||
552 | case SOURCE_TIME_REALTIME_ALARM: | |
553 | return CLOCK_REALTIME_ALARM; | |
554 | ||
555 | case SOURCE_TIME_BOOTTIME_ALARM: | |
556 | return CLOCK_BOOTTIME_ALARM; | |
557 | ||
558 | default: | |
559 | return (clockid_t) -1; | |
560 | } | |
561 | } | |
562 | ||
563 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
564 | ||
565 | switch (clock) { | |
566 | ||
567 | case CLOCK_REALTIME: | |
568 | return SOURCE_TIME_REALTIME; | |
569 | ||
a8548816 TG |
570 | case CLOCK_BOOTTIME: |
571 | return SOURCE_TIME_BOOTTIME; | |
572 | ||
6a0f1f6d LP |
573 | case CLOCK_MONOTONIC: |
574 | return SOURCE_TIME_MONOTONIC; | |
575 | ||
576 | case CLOCK_REALTIME_ALARM: | |
577 | return SOURCE_TIME_REALTIME_ALARM; | |
578 | ||
579 | case CLOCK_BOOTTIME_ALARM: | |
580 | return SOURCE_TIME_BOOTTIME_ALARM; | |
581 | ||
582 | default: | |
583 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
584 | } | |
585 | } | |
586 | ||
587 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
588 | assert(e); | |
589 | ||
590 | switch (t) { | |
591 | ||
592 | case SOURCE_TIME_REALTIME: | |
593 | return &e->realtime; | |
594 | ||
a8548816 TG |
595 | case SOURCE_TIME_BOOTTIME: |
596 | return &e->boottime; | |
597 | ||
6a0f1f6d LP |
598 | case SOURCE_TIME_MONOTONIC: |
599 | return &e->monotonic; | |
600 | ||
601 | case SOURCE_TIME_REALTIME_ALARM: | |
602 | return &e->realtime_alarm; | |
603 | ||
604 | case SOURCE_TIME_BOOTTIME_ALARM: | |
605 | return &e->boottime_alarm; | |
606 | ||
607 | default: | |
608 | return NULL; | |
609 | } | |
610 | } | |
611 | ||
9da4cb2b LP |
612 | static int event_make_signal_data( |
613 | sd_event *e, | |
614 | int sig, | |
615 | struct signal_data **ret) { | |
4807d2d0 | 616 | |
f95387cd | 617 | struct epoll_event ev = {}; |
9da4cb2b LP |
618 | struct signal_data *d; |
619 | bool added = false; | |
620 | sigset_t ss_copy; | |
621 | int64_t priority; | |
f95387cd ZJS |
622 | int r; |
623 | ||
624 | assert(e); | |
625 | ||
f6806734 | 626 | if (event_pid_changed(e)) |
9da4cb2b | 627 | return -ECHILD; |
f6806734 | 628 | |
9da4cb2b LP |
629 | if (e->signal_sources && e->signal_sources[sig]) |
630 | priority = e->signal_sources[sig]->priority; | |
631 | else | |
632 | priority = 0; | |
f95387cd | 633 | |
9da4cb2b LP |
634 | d = hashmap_get(e->signal_data, &priority); |
635 | if (d) { | |
636 | if (sigismember(&d->sigset, sig) > 0) { | |
637 | if (ret) | |
638 | *ret = d; | |
639 | return 0; | |
640 | } | |
641 | } else { | |
642 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); | |
643 | if (r < 0) | |
644 | return r; | |
645 | ||
646 | d = new0(struct signal_data, 1); | |
647 | if (!d) | |
648 | return -ENOMEM; | |
649 | ||
650 | d->wakeup = WAKEUP_SIGNAL_DATA; | |
651 | d->fd = -1; | |
652 | d->priority = priority; | |
653 | ||
654 | r = hashmap_put(e->signal_data, &d->priority, d); | |
655 | if (r < 0) | |
656 | return r; | |
f95387cd | 657 | |
9da4cb2b LP |
658 | added = true; |
659 | } | |
660 | ||
661 | ss_copy = d->sigset; | |
662 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
663 | ||
664 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
665 | if (r < 0) { | |
666 | r = -errno; | |
667 | goto fail; | |
668 | } | |
669 | ||
670 | d->sigset = ss_copy; | |
f95387cd | 671 | |
9da4cb2b LP |
672 | if (d->fd >= 0) { |
673 | if (ret) | |
674 | *ret = d; | |
f95387cd | 675 | return 0; |
9da4cb2b LP |
676 | } |
677 | ||
678 | d->fd = r; | |
f95387cd ZJS |
679 | |
680 | ev.events = EPOLLIN; | |
9da4cb2b | 681 | ev.data.ptr = d; |
f95387cd | 682 | |
9da4cb2b LP |
683 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
684 | if (r < 0) { | |
685 | r = -errno; | |
686 | goto fail; | |
f95387cd ZJS |
687 | } |
688 | ||
9da4cb2b LP |
689 | if (ret) |
690 | *ret = d; | |
691 | ||
f95387cd | 692 | return 0; |
9da4cb2b LP |
693 | |
694 | fail: | |
695 | if (added) { | |
696 | d->fd = safe_close(d->fd); | |
697 | hashmap_remove(e->signal_data, &d->priority); | |
698 | free(d); | |
699 | } | |
700 | ||
701 | return r; | |
702 | } | |
703 | ||
704 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
705 | assert(e); | |
706 | assert(d); | |
707 | ||
708 | /* Turns off the specified signal in the signal data | |
709 | * object. If the signal mask of the object becomes empty that | |
710 | * way removes it. */ | |
711 | ||
712 | if (sigismember(&d->sigset, sig) == 0) | |
713 | return; | |
714 | ||
715 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
716 | ||
717 | if (sigisemptyset(&d->sigset)) { | |
718 | ||
719 | /* If all the mask is all-zero we can get rid of the structure */ | |
720 | hashmap_remove(e->signal_data, &d->priority); | |
721 | assert(!d->current); | |
722 | safe_close(d->fd); | |
723 | free(d); | |
724 | return; | |
725 | } | |
726 | ||
727 | assert(d->fd >= 0); | |
728 | ||
729 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
730 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
731 | } | |
732 | ||
733 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
734 | struct signal_data *d; | |
735 | static const int64_t zero_priority = 0; | |
736 | ||
737 | assert(e); | |
738 | ||
739 | /* Rechecks if the specified signal is still something we are | |
740 | * interested in. If not, we'll unmask it, and possibly drop | |
741 | * the signalfd for it. */ | |
742 | ||
743 | if (sig == SIGCHLD && | |
744 | e->n_enabled_child_sources > 0) | |
745 | return; | |
746 | ||
747 | if (e->signal_sources && | |
748 | e->signal_sources[sig] && | |
749 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
750 | return; | |
751 | ||
752 | /* | |
753 | * The specified signal might be enabled in three different queues: | |
754 | * | |
755 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
756 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
757 | * 3) the 0 priority (to cover the SIGCHLD case) | |
758 | * | |
759 | * Hence, let's remove it from all three here. | |
760 | */ | |
761 | ||
762 | if (priority) { | |
763 | d = hashmap_get(e->signal_data, priority); | |
764 | if (d) | |
765 | event_unmask_signal_data(e, d, sig); | |
766 | } | |
767 | ||
768 | if (e->signal_sources && e->signal_sources[sig]) { | |
769 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
770 | if (d) | |
771 | event_unmask_signal_data(e, d, sig); | |
772 | } | |
773 | ||
774 | d = hashmap_get(e->signal_data, &zero_priority); | |
775 | if (d) | |
776 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
777 | } |
778 | ||
a71fe8b8 LP |
779 | static void source_disconnect(sd_event_source *s) { |
780 | sd_event *event; | |
781 | ||
fd38203a LP |
782 | assert(s); |
783 | ||
a71fe8b8 LP |
784 | if (!s->event) |
785 | return; | |
15b38f93 | 786 | |
a71fe8b8 | 787 | assert(s->event->n_sources > 0); |
fd38203a | 788 | |
a71fe8b8 | 789 | switch (s->type) { |
fd38203a | 790 | |
a71fe8b8 LP |
791 | case SOURCE_IO: |
792 | if (s->io.fd >= 0) | |
793 | source_io_unregister(s); | |
fd38203a | 794 | |
a71fe8b8 | 795 | break; |
6a0f1f6d | 796 | |
a71fe8b8 | 797 | case SOURCE_TIME_REALTIME: |
a8548816 | 798 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
799 | case SOURCE_TIME_MONOTONIC: |
800 | case SOURCE_TIME_REALTIME_ALARM: | |
801 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
802 | struct clock_data *d; | |
fd38203a | 803 | |
a71fe8b8 LP |
804 | d = event_get_clock_data(s->event, s->type); |
805 | assert(d); | |
806 | ||
807 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
808 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 809 | d->needs_rearm = true; |
a71fe8b8 LP |
810 | break; |
811 | } | |
812 | ||
813 | case SOURCE_SIGNAL: | |
814 | if (s->signal.sig > 0) { | |
9da4cb2b | 815 | |
a71fe8b8 LP |
816 | if (s->event->signal_sources) |
817 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 818 | |
9da4cb2b | 819 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 820 | } |
fd38203a | 821 | |
a71fe8b8 | 822 | break; |
fd38203a | 823 | |
a71fe8b8 LP |
824 | case SOURCE_CHILD: |
825 | if (s->child.pid > 0) { | |
826 | if (s->enabled != SD_EVENT_OFF) { | |
827 | assert(s->event->n_enabled_child_sources > 0); | |
828 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 829 | } |
fd38203a | 830 | |
4a0b58c4 | 831 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
9da4cb2b | 832 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
a71fe8b8 | 833 | } |
fd38203a | 834 | |
a71fe8b8 | 835 | break; |
fd38203a | 836 | |
a71fe8b8 LP |
837 | case SOURCE_DEFER: |
838 | /* nothing */ | |
839 | break; | |
fd38203a | 840 | |
a71fe8b8 LP |
841 | case SOURCE_POST: |
842 | set_remove(s->event->post_sources, s); | |
843 | break; | |
da7e457c | 844 | |
a71fe8b8 LP |
845 | case SOURCE_EXIT: |
846 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
847 | break; | |
0eb2e0e3 | 848 | |
a71fe8b8 LP |
849 | default: |
850 | assert_not_reached("Wut? I shouldn't exist."); | |
851 | } | |
6e9feda3 | 852 | |
a71fe8b8 LP |
853 | if (s->pending) |
854 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 855 | |
a71fe8b8 LP |
856 | if (s->prepare) |
857 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 858 | |
a71fe8b8 | 859 | event = s->event; |
fd38203a | 860 | |
a71fe8b8 LP |
861 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
862 | s->event = NULL; | |
863 | LIST_REMOVE(sources, event->sources, s); | |
864 | event->n_sources--; | |
fd38203a | 865 | |
a71fe8b8 LP |
866 | if (!s->floating) |
867 | sd_event_unref(event); | |
868 | } | |
869 | ||
870 | static void source_free(sd_event_source *s) { | |
871 | assert(s); | |
fd38203a | 872 | |
a71fe8b8 | 873 | source_disconnect(s); |
356779df | 874 | free(s->description); |
fd38203a LP |
875 | free(s); |
876 | } | |
877 | ||
878 | static int source_set_pending(sd_event_source *s, bool b) { | |
879 | int r; | |
880 | ||
881 | assert(s); | |
6203e07a | 882 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
883 | |
884 | if (s->pending == b) | |
885 | return 0; | |
886 | ||
887 | s->pending = b; | |
888 | ||
889 | if (b) { | |
890 | s->pending_iteration = s->event->iteration; | |
891 | ||
892 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
893 | if (r < 0) { | |
894 | s->pending = false; | |
895 | return r; | |
896 | } | |
897 | } else | |
898 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
899 | ||
6a0f1f6d LP |
900 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
901 | struct clock_data *d; | |
902 | ||
903 | d = event_get_clock_data(s->event, s->type); | |
904 | assert(d); | |
905 | ||
906 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
907 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 908 | d->needs_rearm = true; |
2576a19e LP |
909 | } |
910 | ||
9da4cb2b LP |
911 | if (s->type == SOURCE_SIGNAL && !b) { |
912 | struct signal_data *d; | |
913 | ||
914 | d = hashmap_get(s->event->signal_data, &s->priority); | |
915 | if (d && d->current == s) | |
916 | d->current = NULL; | |
917 | } | |
918 | ||
fd38203a LP |
919 | return 0; |
920 | } | |
921 | ||
a71fe8b8 | 922 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
923 | sd_event_source *s; |
924 | ||
925 | assert(e); | |
926 | ||
927 | s = new0(sd_event_source, 1); | |
928 | if (!s) | |
929 | return NULL; | |
930 | ||
da7e457c | 931 | s->n_ref = 1; |
a71fe8b8 | 932 | s->event = e; |
4a134c49 | 933 | s->floating = floating; |
fd38203a | 934 | s->type = type; |
fd38203a | 935 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
936 | |
937 | if (!floating) | |
938 | sd_event_ref(e); | |
fd38203a | 939 | |
a71fe8b8 | 940 | LIST_PREPEND(sources, e->sources, s); |
15b38f93 LP |
941 | e->n_sources ++; |
942 | ||
fd38203a LP |
943 | return s; |
944 | } | |
945 | ||
f7262a9f | 946 | _public_ int sd_event_add_io( |
fd38203a | 947 | sd_event *e, |
151b9b96 | 948 | sd_event_source **ret, |
fd38203a LP |
949 | int fd, |
950 | uint32_t events, | |
718db961 | 951 | sd_event_io_handler_t callback, |
151b9b96 | 952 | void *userdata) { |
fd38203a LP |
953 | |
954 | sd_event_source *s; | |
955 | int r; | |
956 | ||
305f78bf | 957 | assert_return(e, -EINVAL); |
8ac43fee | 958 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 959 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 960 | assert_return(callback, -EINVAL); |
da7e457c | 961 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 962 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 963 | |
a71fe8b8 | 964 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
965 | if (!s) |
966 | return -ENOMEM; | |
967 | ||
9da4cb2b | 968 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
969 | s->io.fd = fd; |
970 | s->io.events = events; | |
971 | s->io.callback = callback; | |
972 | s->userdata = userdata; | |
baf76283 | 973 | s->enabled = SD_EVENT_ON; |
fd38203a | 974 | |
baf76283 | 975 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
976 | if (r < 0) { |
977 | source_free(s); | |
050f74f2 | 978 | return r; |
fd38203a LP |
979 | } |
980 | ||
a71fe8b8 LP |
981 | if (ret) |
982 | *ret = s; | |
983 | ||
fd38203a LP |
984 | return 0; |
985 | } | |
986 | ||
52444dc4 LP |
987 | static void initialize_perturb(sd_event *e) { |
988 | sd_id128_t bootid = {}; | |
989 | ||
990 | /* When we sleep for longer, we try to realign the wakeup to | |
991 | the same time wihtin each minute/second/250ms, so that | |
992 | events all across the system can be coalesced into a single | |
993 | CPU wakeup. However, let's take some system-specific | |
994 | randomness for this value, so that in a network of systems | |
995 | with synced clocks timer events are distributed a | |
996 | bit. Here, we calculate a perturbation usec offset from the | |
997 | boot ID. */ | |
998 | ||
3a43da28 | 999 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
1000 | return; |
1001 | ||
1002 | if (sd_id128_get_boot(&bootid) >= 0) | |
1003 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
1004 | } | |
1005 | ||
fd38203a LP |
1006 | static int event_setup_timer_fd( |
1007 | sd_event *e, | |
6a0f1f6d LP |
1008 | struct clock_data *d, |
1009 | clockid_t clock) { | |
fd38203a LP |
1010 | |
1011 | struct epoll_event ev = {}; | |
1012 | int r, fd; | |
1013 | ||
1014 | assert(e); | |
6a0f1f6d | 1015 | assert(d); |
fd38203a | 1016 | |
6a0f1f6d | 1017 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
1018 | return 0; |
1019 | ||
6a0f1f6d | 1020 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
1021 | if (fd < 0) |
1022 | return -errno; | |
1023 | ||
1024 | ev.events = EPOLLIN; | |
9da4cb2b | 1025 | ev.data.ptr = d; |
fd38203a LP |
1026 | |
1027 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
1028 | if (r < 0) { | |
03e334a1 | 1029 | safe_close(fd); |
fd38203a LP |
1030 | return -errno; |
1031 | } | |
1032 | ||
6a0f1f6d | 1033 | d->fd = fd; |
fd38203a LP |
1034 | return 0; |
1035 | } | |
1036 | ||
c4f1aff2 TG |
1037 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1038 | assert(s); | |
1039 | ||
1040 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1041 | } | |
1042 | ||
6a0f1f6d | 1043 | _public_ int sd_event_add_time( |
fd38203a | 1044 | sd_event *e, |
151b9b96 | 1045 | sd_event_source **ret, |
6a0f1f6d | 1046 | clockid_t clock, |
fd38203a | 1047 | uint64_t usec, |
c2ba3ad6 | 1048 | uint64_t accuracy, |
718db961 | 1049 | sd_event_time_handler_t callback, |
151b9b96 | 1050 | void *userdata) { |
fd38203a | 1051 | |
6a0f1f6d | 1052 | EventSourceType type; |
fd38203a | 1053 | sd_event_source *s; |
6a0f1f6d | 1054 | struct clock_data *d; |
fd38203a LP |
1055 | int r; |
1056 | ||
305f78bf | 1057 | assert_return(e, -EINVAL); |
305f78bf LP |
1058 | assert_return(usec != (uint64_t) -1, -EINVAL); |
1059 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
da7e457c | 1060 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1061 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1062 | |
c4f1aff2 TG |
1063 | if (!callback) |
1064 | callback = time_exit_callback; | |
1065 | ||
6a0f1f6d | 1066 | type = clock_to_event_source_type(clock); |
15411c0c | 1067 | assert_return(type >= 0, -EOPNOTSUPP); |
6a0f1f6d LP |
1068 | |
1069 | d = event_get_clock_data(e, type); | |
1070 | assert(d); | |
c2ba3ad6 | 1071 | |
c983e776 EV |
1072 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1073 | if (r < 0) | |
1074 | return r; | |
fd38203a | 1075 | |
c983e776 EV |
1076 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1077 | if (r < 0) | |
1078 | return r; | |
fd38203a | 1079 | |
6a0f1f6d LP |
1080 | if (d->fd < 0) { |
1081 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1082 | if (r < 0) |
1083 | return r; | |
1084 | } | |
1085 | ||
a71fe8b8 | 1086 | s = source_new(e, !ret, type); |
fd38203a LP |
1087 | if (!s) |
1088 | return -ENOMEM; | |
1089 | ||
1090 | s->time.next = usec; | |
c2ba3ad6 | 1091 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1092 | s->time.callback = callback; |
da7e457c | 1093 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1094 | s->userdata = userdata; |
baf76283 | 1095 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1096 | |
e07bbb7c TG |
1097 | d->needs_rearm = true; |
1098 | ||
6a0f1f6d | 1099 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
1100 | if (r < 0) |
1101 | goto fail; | |
1102 | ||
6a0f1f6d | 1103 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
1104 | if (r < 0) |
1105 | goto fail; | |
fd38203a | 1106 | |
a71fe8b8 LP |
1107 | if (ret) |
1108 | *ret = s; | |
1109 | ||
fd38203a | 1110 | return 0; |
c2ba3ad6 LP |
1111 | |
1112 | fail: | |
1113 | source_free(s); | |
1114 | return r; | |
fd38203a LP |
1115 | } |
1116 | ||
59bc1fd7 LP |
1117 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1118 | assert(s); | |
1119 | ||
1120 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1121 | } | |
1122 | ||
f7262a9f | 1123 | _public_ int sd_event_add_signal( |
305f78bf | 1124 | sd_event *e, |
151b9b96 | 1125 | sd_event_source **ret, |
305f78bf | 1126 | int sig, |
718db961 | 1127 | sd_event_signal_handler_t callback, |
151b9b96 | 1128 | void *userdata) { |
305f78bf | 1129 | |
fd38203a | 1130 | sd_event_source *s; |
9da4cb2b | 1131 | struct signal_data *d; |
3022d74b | 1132 | sigset_t ss; |
fd38203a LP |
1133 | int r; |
1134 | ||
305f78bf LP |
1135 | assert_return(e, -EINVAL); |
1136 | assert_return(sig > 0, -EINVAL); | |
1137 | assert_return(sig < _NSIG, -EINVAL); | |
da7e457c | 1138 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1139 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1140 | |
59bc1fd7 LP |
1141 | if (!callback) |
1142 | callback = signal_exit_callback; | |
1143 | ||
3022d74b | 1144 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
50e0d56c LP |
1145 | if (r != 0) |
1146 | return -r; | |
3022d74b LP |
1147 | |
1148 | if (!sigismember(&ss, sig)) | |
1149 | return -EBUSY; | |
1150 | ||
fd38203a LP |
1151 | if (!e->signal_sources) { |
1152 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1153 | if (!e->signal_sources) | |
1154 | return -ENOMEM; | |
1155 | } else if (e->signal_sources[sig]) | |
1156 | return -EBUSY; | |
1157 | ||
a71fe8b8 | 1158 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1159 | if (!s) |
1160 | return -ENOMEM; | |
1161 | ||
1162 | s->signal.sig = sig; | |
1163 | s->signal.callback = callback; | |
1164 | s->userdata = userdata; | |
baf76283 | 1165 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1166 | |
1167 | e->signal_sources[sig] = s; | |
fd38203a | 1168 | |
9da4cb2b LP |
1169 | r = event_make_signal_data(e, sig, &d); |
1170 | if (r < 0) { | |
1171 | source_free(s); | |
1172 | return r; | |
fd38203a LP |
1173 | } |
1174 | ||
f1f00dbb LP |
1175 | /* Use the signal name as description for the event source by default */ |
1176 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1177 | ||
a71fe8b8 LP |
1178 | if (ret) |
1179 | *ret = s; | |
1180 | ||
fd38203a LP |
1181 | return 0; |
1182 | } | |
1183 | ||
f7262a9f | 1184 | _public_ int sd_event_add_child( |
305f78bf | 1185 | sd_event *e, |
151b9b96 | 1186 | sd_event_source **ret, |
305f78bf LP |
1187 | pid_t pid, |
1188 | int options, | |
718db961 | 1189 | sd_event_child_handler_t callback, |
151b9b96 | 1190 | void *userdata) { |
305f78bf | 1191 | |
fd38203a LP |
1192 | sd_event_source *s; |
1193 | int r; | |
1194 | ||
305f78bf LP |
1195 | assert_return(e, -EINVAL); |
1196 | assert_return(pid > 1, -EINVAL); | |
1197 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1198 | assert_return(options != 0, -EINVAL); | |
1199 | assert_return(callback, -EINVAL); | |
da7e457c | 1200 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1201 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1202 | |
d5099efc | 1203 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1204 | if (r < 0) |
1205 | return r; | |
1206 | ||
4a0b58c4 | 1207 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1208 | return -EBUSY; |
1209 | ||
a71fe8b8 | 1210 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1211 | if (!s) |
1212 | return -ENOMEM; | |
1213 | ||
1214 | s->child.pid = pid; | |
1215 | s->child.options = options; | |
1216 | s->child.callback = callback; | |
1217 | s->userdata = userdata; | |
baf76283 | 1218 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1219 | |
4a0b58c4 | 1220 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
fd38203a LP |
1221 | if (r < 0) { |
1222 | source_free(s); | |
1223 | return r; | |
1224 | } | |
1225 | ||
baf76283 | 1226 | e->n_enabled_child_sources ++; |
fd38203a | 1227 | |
9da4cb2b LP |
1228 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1229 | if (r < 0) { | |
1230 | e->n_enabled_child_sources--; | |
1231 | source_free(s); | |
1232 | return r; | |
fd38203a LP |
1233 | } |
1234 | ||
c2ba3ad6 LP |
1235 | e->need_process_child = true; |
1236 | ||
a71fe8b8 LP |
1237 | if (ret) |
1238 | *ret = s; | |
1239 | ||
fd38203a LP |
1240 | return 0; |
1241 | } | |
1242 | ||
f7262a9f | 1243 | _public_ int sd_event_add_defer( |
305f78bf | 1244 | sd_event *e, |
151b9b96 | 1245 | sd_event_source **ret, |
718db961 | 1246 | sd_event_handler_t callback, |
151b9b96 | 1247 | void *userdata) { |
305f78bf | 1248 | |
fd38203a LP |
1249 | sd_event_source *s; |
1250 | int r; | |
1251 | ||
305f78bf LP |
1252 | assert_return(e, -EINVAL); |
1253 | assert_return(callback, -EINVAL); | |
da7e457c | 1254 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1255 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1256 | |
a71fe8b8 | 1257 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1258 | if (!s) |
1259 | return -ENOMEM; | |
1260 | ||
1261 | s->defer.callback = callback; | |
1262 | s->userdata = userdata; | |
baf76283 | 1263 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1264 | |
1265 | r = source_set_pending(s, true); | |
1266 | if (r < 0) { | |
1267 | source_free(s); | |
1268 | return r; | |
1269 | } | |
1270 | ||
a71fe8b8 LP |
1271 | if (ret) |
1272 | *ret = s; | |
1273 | ||
fd38203a LP |
1274 | return 0; |
1275 | } | |
1276 | ||
6e9feda3 LP |
1277 | _public_ int sd_event_add_post( |
1278 | sd_event *e, | |
1279 | sd_event_source **ret, | |
1280 | sd_event_handler_t callback, | |
1281 | void *userdata) { | |
1282 | ||
1283 | sd_event_source *s; | |
1284 | int r; | |
1285 | ||
1286 | assert_return(e, -EINVAL); | |
1287 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1288 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1289 | assert_return(!event_pid_changed(e), -ECHILD); | |
1290 | ||
d5099efc | 1291 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1292 | if (r < 0) |
1293 | return r; | |
1294 | ||
a71fe8b8 | 1295 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1296 | if (!s) |
1297 | return -ENOMEM; | |
1298 | ||
1299 | s->post.callback = callback; | |
1300 | s->userdata = userdata; | |
1301 | s->enabled = SD_EVENT_ON; | |
1302 | ||
1303 | r = set_put(e->post_sources, s); | |
1304 | if (r < 0) { | |
1305 | source_free(s); | |
1306 | return r; | |
1307 | } | |
1308 | ||
a71fe8b8 LP |
1309 | if (ret) |
1310 | *ret = s; | |
1311 | ||
6e9feda3 LP |
1312 | return 0; |
1313 | } | |
1314 | ||
6203e07a | 1315 | _public_ int sd_event_add_exit( |
305f78bf | 1316 | sd_event *e, |
151b9b96 | 1317 | sd_event_source **ret, |
718db961 | 1318 | sd_event_handler_t callback, |
151b9b96 | 1319 | void *userdata) { |
305f78bf | 1320 | |
da7e457c LP |
1321 | sd_event_source *s; |
1322 | int r; | |
1323 | ||
1324 | assert_return(e, -EINVAL); | |
1325 | assert_return(callback, -EINVAL); | |
1326 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1327 | assert_return(!event_pid_changed(e), -ECHILD); | |
1328 | ||
c983e776 EV |
1329 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1330 | if (r < 0) | |
1331 | return r; | |
da7e457c | 1332 | |
a71fe8b8 | 1333 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1334 | if (!s) |
da7e457c | 1335 | return -ENOMEM; |
fd38203a | 1336 | |
6203e07a | 1337 | s->exit.callback = callback; |
da7e457c | 1338 | s->userdata = userdata; |
6203e07a | 1339 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1340 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1341 | |
6203e07a | 1342 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1343 | if (r < 0) { |
1344 | source_free(s); | |
1345 | return r; | |
1346 | } | |
1347 | ||
a71fe8b8 LP |
1348 | if (ret) |
1349 | *ret = s; | |
1350 | ||
da7e457c LP |
1351 | return 0; |
1352 | } | |
1353 | ||
f7262a9f | 1354 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
6680dd6b LP |
1355 | |
1356 | if (!s) | |
1357 | return NULL; | |
da7e457c LP |
1358 | |
1359 | assert(s->n_ref >= 1); | |
1360 | s->n_ref++; | |
fd38203a LP |
1361 | |
1362 | return s; | |
1363 | } | |
1364 | ||
f7262a9f | 1365 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1366 | |
1367 | if (!s) | |
1368 | return NULL; | |
fd38203a | 1369 | |
da7e457c LP |
1370 | assert(s->n_ref >= 1); |
1371 | s->n_ref--; | |
1372 | ||
12179984 LP |
1373 | if (s->n_ref <= 0) { |
1374 | /* Here's a special hack: when we are called from a | |
1375 | * dispatch handler we won't free the event source | |
1376 | * immediately, but we will detach the fd from the | |
1377 | * epoll. This way it is safe for the caller to unref | |
1378 | * the event source and immediately close the fd, but | |
1379 | * we still retain a valid event source object after | |
1380 | * the callback. */ | |
1381 | ||
1382 | if (s->dispatching) { | |
1383 | if (s->type == SOURCE_IO) | |
1384 | source_io_unregister(s); | |
a71fe8b8 LP |
1385 | |
1386 | source_disconnect(s); | |
12179984 LP |
1387 | } else |
1388 | source_free(s); | |
1389 | } | |
fd38203a LP |
1390 | |
1391 | return NULL; | |
1392 | } | |
1393 | ||
356779df | 1394 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1395 | assert_return(s, -EINVAL); |
f4b2933e | 1396 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1397 | |
356779df | 1398 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1399 | } |
1400 | ||
356779df | 1401 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1402 | assert_return(s, -EINVAL); |
356779df | 1403 | assert_return(description, -EINVAL); |
f4b2933e LP |
1404 | assert_return(s->description, -ENXIO); |
1405 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
f7f53e9e | 1406 | |
356779df | 1407 | *description = s->description; |
f7f53e9e TG |
1408 | return 0; |
1409 | } | |
1410 | ||
adcc4ca3 | 1411 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1412 | assert_return(s, NULL); |
eaa3cbef LP |
1413 | |
1414 | return s->event; | |
1415 | } | |
1416 | ||
f7262a9f | 1417 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1418 | assert_return(s, -EINVAL); |
6203e07a | 1419 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1420 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1421 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1422 | |
1423 | return s->pending; | |
1424 | } | |
1425 | ||
f7262a9f | 1426 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1427 | assert_return(s, -EINVAL); |
1428 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1429 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1430 | |
1431 | return s->io.fd; | |
1432 | } | |
1433 | ||
30caf8f3 LP |
1434 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1435 | int r; | |
1436 | ||
1437 | assert_return(s, -EINVAL); | |
8ac43fee | 1438 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1439 | assert_return(s->type == SOURCE_IO, -EDOM); |
1440 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1441 | ||
1442 | if (s->io.fd == fd) | |
1443 | return 0; | |
1444 | ||
1445 | if (s->enabled == SD_EVENT_OFF) { | |
1446 | s->io.fd = fd; | |
1447 | s->io.registered = false; | |
1448 | } else { | |
1449 | int saved_fd; | |
1450 | ||
1451 | saved_fd = s->io.fd; | |
1452 | assert(s->io.registered); | |
1453 | ||
1454 | s->io.fd = fd; | |
1455 | s->io.registered = false; | |
1456 | ||
1457 | r = source_io_register(s, s->enabled, s->io.events); | |
1458 | if (r < 0) { | |
1459 | s->io.fd = saved_fd; | |
1460 | s->io.registered = true; | |
1461 | return r; | |
1462 | } | |
1463 | ||
1464 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1465 | } | |
1466 | ||
1467 | return 0; | |
1468 | } | |
1469 | ||
f7262a9f | 1470 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1471 | assert_return(s, -EINVAL); |
1472 | assert_return(events, -EINVAL); | |
1473 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1474 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1475 | |
1476 | *events = s->io.events; | |
1477 | return 0; | |
1478 | } | |
1479 | ||
f7262a9f | 1480 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1481 | int r; |
1482 | ||
305f78bf LP |
1483 | assert_return(s, -EINVAL); |
1484 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1485 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1486 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1487 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1488 | |
b63c8d4f DH |
1489 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1490 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1491 | return 0; |
1492 | ||
baf76283 | 1493 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1494 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1495 | if (r < 0) |
1496 | return r; | |
1497 | } | |
1498 | ||
1499 | s->io.events = events; | |
503f39c3 | 1500 | source_set_pending(s, false); |
fd38203a LP |
1501 | |
1502 | return 0; | |
1503 | } | |
1504 | ||
f7262a9f | 1505 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1506 | assert_return(s, -EINVAL); |
1507 | assert_return(revents, -EINVAL); | |
1508 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1509 | assert_return(s->pending, -ENODATA); | |
1510 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1511 | |
1512 | *revents = s->io.revents; | |
1513 | return 0; | |
1514 | } | |
1515 | ||
f7262a9f | 1516 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1517 | assert_return(s, -EINVAL); |
1518 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1519 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1520 | |
1521 | return s->signal.sig; | |
1522 | } | |
1523 | ||
31927c16 | 1524 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1525 | assert_return(s, -EINVAL); |
1526 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1527 | |
1528 | return s->priority; | |
1529 | } | |
1530 | ||
31927c16 | 1531 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
9da4cb2b LP |
1532 | int r; |
1533 | ||
305f78bf | 1534 | assert_return(s, -EINVAL); |
da7e457c | 1535 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1536 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1537 | |
1538 | if (s->priority == priority) | |
1539 | return 0; | |
1540 | ||
9da4cb2b LP |
1541 | if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { |
1542 | struct signal_data *old, *d; | |
1543 | ||
1544 | /* Move us from the signalfd belonging to the old | |
1545 | * priority to the signalfd of the new priority */ | |
1546 | ||
1547 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
1548 | ||
1549 | s->priority = priority; | |
1550 | ||
1551 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
1552 | if (r < 0) { | |
1553 | s->priority = old->priority; | |
1554 | return r; | |
1555 | } | |
1556 | ||
1557 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
1558 | } else | |
1559 | s->priority = priority; | |
fd38203a LP |
1560 | |
1561 | if (s->pending) | |
c2ba3ad6 | 1562 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1563 | |
1564 | if (s->prepare) | |
c2ba3ad6 | 1565 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1566 | |
6203e07a LP |
1567 | if (s->type == SOURCE_EXIT) |
1568 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1569 | |
fd38203a LP |
1570 | return 0; |
1571 | } | |
1572 | ||
f7262a9f | 1573 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1574 | assert_return(s, -EINVAL); |
1575 | assert_return(m, -EINVAL); | |
1576 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1577 | |
baf76283 | 1578 | *m = s->enabled; |
fd38203a LP |
1579 | return 0; |
1580 | } | |
1581 | ||
f7262a9f | 1582 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1583 | int r; |
1584 | ||
305f78bf LP |
1585 | assert_return(s, -EINVAL); |
1586 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
305f78bf | 1587 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1588 | |
cc567911 LP |
1589 | /* If we are dead anyway, we are fine with turning off |
1590 | * sources, but everything else needs to fail. */ | |
1591 | if (s->event->state == SD_EVENT_FINISHED) | |
1592 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1593 | ||
baf76283 | 1594 | if (s->enabled == m) |
fd38203a LP |
1595 | return 0; |
1596 | ||
baf76283 | 1597 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1598 | |
1599 | switch (s->type) { | |
1600 | ||
1601 | case SOURCE_IO: | |
366e6411 | 1602 | source_io_unregister(s); |
baf76283 | 1603 | s->enabled = m; |
fd38203a LP |
1604 | break; |
1605 | ||
6a0f1f6d | 1606 | case SOURCE_TIME_REALTIME: |
a8548816 | 1607 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1608 | case SOURCE_TIME_MONOTONIC: |
1609 | case SOURCE_TIME_REALTIME_ALARM: | |
1610 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1611 | struct clock_data *d; | |
fd38203a | 1612 | |
baf76283 | 1613 | s->enabled = m; |
6a0f1f6d LP |
1614 | d = event_get_clock_data(s->event, s->type); |
1615 | assert(d); | |
1616 | ||
1617 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1618 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1619 | d->needs_rearm = true; |
fd38203a | 1620 | break; |
6a0f1f6d | 1621 | } |
fd38203a LP |
1622 | |
1623 | case SOURCE_SIGNAL: | |
baf76283 | 1624 | s->enabled = m; |
4807d2d0 | 1625 | |
9da4cb2b | 1626 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
fd38203a LP |
1627 | break; |
1628 | ||
1629 | case SOURCE_CHILD: | |
baf76283 | 1630 | s->enabled = m; |
fd38203a | 1631 | |
baf76283 LP |
1632 | assert(s->event->n_enabled_child_sources > 0); |
1633 | s->event->n_enabled_child_sources--; | |
fd38203a | 1634 | |
9da4cb2b | 1635 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
fd38203a LP |
1636 | break; |
1637 | ||
6203e07a | 1638 | case SOURCE_EXIT: |
305f78bf | 1639 | s->enabled = m; |
6203e07a | 1640 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1641 | break; |
1642 | ||
1643 | case SOURCE_DEFER: | |
6e9feda3 | 1644 | case SOURCE_POST: |
baf76283 | 1645 | s->enabled = m; |
fd38203a | 1646 | break; |
9d3e3aa5 | 1647 | |
6a0f1f6d | 1648 | default: |
9d3e3aa5 | 1649 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1650 | } |
1651 | ||
1652 | } else { | |
1653 | switch (s->type) { | |
1654 | ||
1655 | case SOURCE_IO: | |
1656 | r = source_io_register(s, m, s->io.events); | |
1657 | if (r < 0) | |
1658 | return r; | |
1659 | ||
baf76283 | 1660 | s->enabled = m; |
fd38203a LP |
1661 | break; |
1662 | ||
6a0f1f6d | 1663 | case SOURCE_TIME_REALTIME: |
a8548816 | 1664 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1665 | case SOURCE_TIME_MONOTONIC: |
1666 | case SOURCE_TIME_REALTIME_ALARM: | |
1667 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1668 | struct clock_data *d; | |
fd38203a | 1669 | |
baf76283 | 1670 | s->enabled = m; |
6a0f1f6d LP |
1671 | d = event_get_clock_data(s->event, s->type); |
1672 | assert(d); | |
1673 | ||
1674 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1675 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1676 | d->needs_rearm = true; |
fd38203a | 1677 | break; |
6a0f1f6d | 1678 | } |
fd38203a LP |
1679 | |
1680 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1681 | |
1682 | s->enabled = m; | |
9da4cb2b LP |
1683 | |
1684 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
1685 | if (r < 0) { | |
1686 | s->enabled = SD_EVENT_OFF; | |
1687 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
1688 | return r; | |
1689 | } | |
1690 | ||
fd38203a LP |
1691 | break; |
1692 | ||
1693 | case SOURCE_CHILD: | |
4807d2d0 | 1694 | |
9da4cb2b | 1695 | if (s->enabled == SD_EVENT_OFF) |
4807d2d0 | 1696 | s->event->n_enabled_child_sources++; |
7a0d4a3d DH |
1697 | |
1698 | s->enabled = m; | |
9da4cb2b | 1699 | |
10edebf6 | 1700 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
9da4cb2b LP |
1701 | if (r < 0) { |
1702 | s->enabled = SD_EVENT_OFF; | |
1703 | s->event->n_enabled_child_sources--; | |
1704 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
1705 | return r; | |
1706 | } | |
1707 | ||
fd38203a LP |
1708 | break; |
1709 | ||
6203e07a | 1710 | case SOURCE_EXIT: |
305f78bf | 1711 | s->enabled = m; |
6203e07a | 1712 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1713 | break; |
1714 | ||
1715 | case SOURCE_DEFER: | |
6e9feda3 | 1716 | case SOURCE_POST: |
baf76283 | 1717 | s->enabled = m; |
fd38203a | 1718 | break; |
9d3e3aa5 | 1719 | |
6a0f1f6d | 1720 | default: |
9d3e3aa5 | 1721 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1722 | } |
1723 | } | |
1724 | ||
1725 | if (s->pending) | |
1726 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1727 | ||
1728 | if (s->prepare) | |
1729 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1730 | ||
1731 | return 0; | |
1732 | } | |
1733 | ||
f7262a9f | 1734 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1735 | assert_return(s, -EINVAL); |
1736 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1737 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1738 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1739 | |
1740 | *usec = s->time.next; | |
1741 | return 0; | |
1742 | } | |
1743 | ||
f7262a9f | 1744 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1745 | struct clock_data *d; |
1746 | ||
305f78bf LP |
1747 | assert_return(s, -EINVAL); |
1748 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1749 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1750 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1751 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1752 | |
fd38203a | 1753 | s->time.next = usec; |
2576a19e | 1754 | |
0cc1125a | 1755 | source_set_pending(s, false); |
fd38203a | 1756 | |
6a0f1f6d LP |
1757 | d = event_get_clock_data(s->event, s->type); |
1758 | assert(d); | |
1759 | ||
1760 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1761 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1762 | d->needs_rearm = true; |
fd38203a LP |
1763 | |
1764 | return 0; | |
1765 | } | |
1766 | ||
f7262a9f | 1767 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1768 | assert_return(s, -EINVAL); |
1769 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1770 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1771 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1772 | ||
1773 | *usec = s->time.accuracy; | |
1774 | return 0; | |
1775 | } | |
1776 | ||
f7262a9f | 1777 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1778 | struct clock_data *d; |
1779 | ||
305f78bf LP |
1780 | assert_return(s, -EINVAL); |
1781 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1782 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1783 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1784 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1785 | |
1786 | if (usec == 0) | |
1787 | usec = DEFAULT_ACCURACY_USEC; | |
1788 | ||
eaa3cbef LP |
1789 | s->time.accuracy = usec; |
1790 | ||
2576a19e LP |
1791 | source_set_pending(s, false); |
1792 | ||
6a0f1f6d LP |
1793 | d = event_get_clock_data(s->event, s->type); |
1794 | assert(d); | |
1795 | ||
1796 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1797 | d->needs_rearm = true; |
6a0f1f6d LP |
1798 | |
1799 | return 0; | |
1800 | } | |
1801 | ||
1802 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1803 | assert_return(s, -EINVAL); | |
1804 | assert_return(clock, -EINVAL); | |
1805 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1806 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1807 | |
6a0f1f6d | 1808 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1809 | return 0; |
1810 | } | |
1811 | ||
f7262a9f | 1812 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1813 | assert_return(s, -EINVAL); |
1814 | assert_return(pid, -EINVAL); | |
1815 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1816 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1817 | ||
1818 | *pid = s->child.pid; | |
1819 | return 0; | |
1820 | } | |
1821 | ||
718db961 | 1822 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1823 | int r; |
1824 | ||
da7e457c | 1825 | assert_return(s, -EINVAL); |
6203e07a | 1826 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1827 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1828 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1829 | |
1830 | if (s->prepare == callback) | |
1831 | return 0; | |
1832 | ||
1833 | if (callback && s->prepare) { | |
1834 | s->prepare = callback; | |
1835 | return 0; | |
1836 | } | |
1837 | ||
1838 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1839 | if (r < 0) | |
1840 | return r; | |
1841 | ||
1842 | s->prepare = callback; | |
1843 | ||
1844 | if (callback) { | |
1845 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1846 | if (r < 0) | |
1847 | return r; | |
1848 | } else | |
1849 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1850 | ||
1851 | return 0; | |
1852 | } | |
1853 | ||
f7262a9f | 1854 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1855 | assert_return(s, NULL); |
fd38203a LP |
1856 | |
1857 | return s->userdata; | |
1858 | } | |
1859 | ||
8f726607 LP |
1860 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1861 | void *ret; | |
1862 | ||
1863 | assert_return(s, NULL); | |
1864 | ||
1865 | ret = s->userdata; | |
1866 | s->userdata = userdata; | |
1867 | ||
1868 | return ret; | |
1869 | } | |
1870 | ||
c2ba3ad6 LP |
1871 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1872 | usec_t c; | |
1873 | assert(e); | |
1874 | assert(a <= b); | |
1875 | ||
1876 | if (a <= 0) | |
1877 | return 0; | |
1878 | ||
1879 | if (b <= a + 1) | |
1880 | return a; | |
1881 | ||
52444dc4 LP |
1882 | initialize_perturb(e); |
1883 | ||
c2ba3ad6 LP |
1884 | /* |
1885 | Find a good time to wake up again between times a and b. We | |
1886 | have two goals here: | |
1887 | ||
1888 | a) We want to wake up as seldom as possible, hence prefer | |
1889 | later times over earlier times. | |
1890 | ||
1891 | b) But if we have to wake up, then let's make sure to | |
1892 | dispatch as much as possible on the entire system. | |
1893 | ||
1894 | We implement this by waking up everywhere at the same time | |
850516e0 | 1895 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1896 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1897 | then we try to find the same spot in every 10s, then 1s and |
1898 | then 250ms step. Otherwise, we pick the last possible time | |
1899 | to wake up. | |
c2ba3ad6 LP |
1900 | */ |
1901 | ||
850516e0 LP |
1902 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1903 | if (c >= b) { | |
1904 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1905 | return b; | |
1906 | ||
1907 | c -= USEC_PER_MINUTE; | |
1908 | } | |
1909 | ||
ba276c81 LP |
1910 | if (c >= a) |
1911 | return c; | |
1912 | ||
1913 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1914 | if (c >= b) { | |
1915 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1916 | return b; | |
1917 | ||
1918 | c -= USEC_PER_SEC*10; | |
1919 | } | |
1920 | ||
850516e0 LP |
1921 | if (c >= a) |
1922 | return c; | |
1923 | ||
1924 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1925 | if (c >= b) { |
1926 | if (_unlikely_(c < USEC_PER_SEC)) | |
1927 | return b; | |
1928 | ||
1929 | c -= USEC_PER_SEC; | |
1930 | } | |
1931 | ||
1932 | if (c >= a) | |
1933 | return c; | |
1934 | ||
1935 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1936 | if (c >= b) { | |
1937 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1938 | return b; | |
1939 | ||
1940 | c -= USEC_PER_MSEC*250; | |
1941 | } | |
1942 | ||
1943 | if (c >= a) | |
1944 | return c; | |
1945 | ||
1946 | return b; | |
1947 | } | |
1948 | ||
fd38203a LP |
1949 | static int event_arm_timer( |
1950 | sd_event *e, | |
6a0f1f6d | 1951 | struct clock_data *d) { |
fd38203a LP |
1952 | |
1953 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1954 | sd_event_source *a, *b; |
1955 | usec_t t; | |
fd38203a LP |
1956 | int r; |
1957 | ||
cde93897 | 1958 | assert(e); |
6a0f1f6d | 1959 | assert(d); |
fd38203a | 1960 | |
d06441da | 1961 | if (!d->needs_rearm) |
212bbb17 TG |
1962 | return 0; |
1963 | else | |
1964 | d->needs_rearm = false; | |
1965 | ||
6a0f1f6d | 1966 | a = prioq_peek(d->earliest); |
72aedc1e LP |
1967 | if (!a || a->enabled == SD_EVENT_OFF) { |
1968 | ||
6a0f1f6d | 1969 | if (d->fd < 0) |
c57b5ca3 LP |
1970 | return 0; |
1971 | ||
3a43da28 | 1972 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
1973 | return 0; |
1974 | ||
1975 | /* disarm */ | |
6a0f1f6d | 1976 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1977 | if (r < 0) |
1978 | return r; | |
1979 | ||
3a43da28 | 1980 | d->next = USEC_INFINITY; |
fd38203a | 1981 | return 0; |
72aedc1e | 1982 | } |
fd38203a | 1983 | |
6a0f1f6d | 1984 | b = prioq_peek(d->latest); |
baf76283 | 1985 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1986 | |
1987 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
6a0f1f6d | 1988 | if (d->next == t) |
fd38203a LP |
1989 | return 0; |
1990 | ||
6a0f1f6d | 1991 | assert_se(d->fd >= 0); |
fd38203a | 1992 | |
c2ba3ad6 | 1993 | if (t == 0) { |
fd38203a LP |
1994 | /* We don' want to disarm here, just mean some time looooong ago. */ |
1995 | its.it_value.tv_sec = 0; | |
1996 | its.it_value.tv_nsec = 1; | |
1997 | } else | |
c2ba3ad6 | 1998 | timespec_store(&its.it_value, t); |
fd38203a | 1999 | |
6a0f1f6d | 2000 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 2001 | if (r < 0) |
cde93897 | 2002 | return -errno; |
fd38203a | 2003 | |
6a0f1f6d | 2004 | d->next = t; |
fd38203a LP |
2005 | return 0; |
2006 | } | |
2007 | ||
9a800b56 | 2008 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
2009 | assert(e); |
2010 | assert(s); | |
2011 | assert(s->type == SOURCE_IO); | |
2012 | ||
9a800b56 LP |
2013 | /* If the event source was already pending, we just OR in the |
2014 | * new revents, otherwise we reset the value. The ORing is | |
2015 | * necessary to handle EPOLLONESHOT events properly where | |
2016 | * readability might happen independently of writability, and | |
2017 | * we need to keep track of both */ | |
2018 | ||
2019 | if (s->pending) | |
2020 | s->io.revents |= revents; | |
2021 | else | |
2022 | s->io.revents = revents; | |
fd38203a | 2023 | |
fd38203a LP |
2024 | return source_set_pending(s, true); |
2025 | } | |
2026 | ||
72aedc1e | 2027 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2028 | uint64_t x; |
2029 | ssize_t ss; | |
2030 | ||
2031 | assert(e); | |
da7e457c | 2032 | assert(fd >= 0); |
72aedc1e | 2033 | |
305f78bf | 2034 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2035 | |
2036 | ss = read(fd, &x, sizeof(x)); | |
2037 | if (ss < 0) { | |
2038 | if (errno == EAGAIN || errno == EINTR) | |
2039 | return 0; | |
2040 | ||
2041 | return -errno; | |
2042 | } | |
2043 | ||
8d35dae7 | 2044 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2045 | return -EIO; |
2046 | ||
cde93897 | 2047 | if (next) |
3a43da28 | 2048 | *next = USEC_INFINITY; |
72aedc1e | 2049 | |
fd38203a LP |
2050 | return 0; |
2051 | } | |
2052 | ||
305f78bf LP |
2053 | static int process_timer( |
2054 | sd_event *e, | |
2055 | usec_t n, | |
6a0f1f6d | 2056 | struct clock_data *d) { |
305f78bf | 2057 | |
fd38203a LP |
2058 | sd_event_source *s; |
2059 | int r; | |
2060 | ||
2061 | assert(e); | |
6a0f1f6d | 2062 | assert(d); |
fd38203a LP |
2063 | |
2064 | for (;;) { | |
6a0f1f6d | 2065 | s = prioq_peek(d->earliest); |
fd38203a LP |
2066 | if (!s || |
2067 | s->time.next > n || | |
baf76283 | 2068 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2069 | s->pending) |
2070 | break; | |
2071 | ||
2072 | r = source_set_pending(s, true); | |
2073 | if (r < 0) | |
2074 | return r; | |
2075 | ||
6a0f1f6d LP |
2076 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2077 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 2078 | d->needs_rearm = true; |
fd38203a LP |
2079 | } |
2080 | ||
2081 | return 0; | |
2082 | } | |
2083 | ||
2084 | static int process_child(sd_event *e) { | |
2085 | sd_event_source *s; | |
2086 | Iterator i; | |
2087 | int r; | |
2088 | ||
2089 | assert(e); | |
2090 | ||
c2ba3ad6 LP |
2091 | e->need_process_child = false; |
2092 | ||
fd38203a LP |
2093 | /* |
2094 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2095 | + WNOHANG for each PID we wait for, instead of using | |
2096 | P_ALL. This is because we only want to get child | |
2097 | information of very specific child processes, and not all | |
2098 | of them. We might not have processed the SIGCHLD even of a | |
2099 | previous invocation and we don't want to maintain a | |
2100 | unbounded *per-child* event queue, hence we really don't | |
2101 | want anything flushed out of the kernel's queue that we | |
2102 | don't care about. Since this is O(n) this means that if you | |
2103 | have a lot of processes you probably want to handle SIGCHLD | |
2104 | yourself. | |
08cd1552 LP |
2105 | |
2106 | We do not reap the children here (by using WNOWAIT), this | |
2107 | is only done after the event source is dispatched so that | |
2108 | the callback still sees the process as a zombie. | |
fd38203a LP |
2109 | */ |
2110 | ||
2111 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2112 | assert(s->type == SOURCE_CHILD); | |
2113 | ||
2114 | if (s->pending) | |
2115 | continue; | |
2116 | ||
baf76283 | 2117 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2118 | continue; |
2119 | ||
2120 | zero(s->child.siginfo); | |
08cd1552 LP |
2121 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2122 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
2123 | if (r < 0) |
2124 | return -errno; | |
2125 | ||
2126 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
2127 | bool zombie = |
2128 | s->child.siginfo.si_code == CLD_EXITED || | |
2129 | s->child.siginfo.si_code == CLD_KILLED || | |
2130 | s->child.siginfo.si_code == CLD_DUMPED; | |
2131 | ||
2132 | if (!zombie && (s->child.options & WEXITED)) { | |
2133 | /* If the child isn't dead then let's | |
2134 | * immediately remove the state change | |
2135 | * from the queue, since there's no | |
2136 | * benefit in leaving it queued */ | |
2137 | ||
2138 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2139 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2140 | } | |
2141 | ||
fd38203a LP |
2142 | r = source_set_pending(s, true); |
2143 | if (r < 0) | |
2144 | return r; | |
2145 | } | |
2146 | } | |
2147 | ||
fd38203a LP |
2148 | return 0; |
2149 | } | |
2150 | ||
9da4cb2b | 2151 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2152 | bool read_one = false; |
fd38203a LP |
2153 | int r; |
2154 | ||
da7e457c | 2155 | assert(e); |
305f78bf | 2156 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2157 | |
9da4cb2b LP |
2158 | /* If there's a signal queued on this priority and SIGCHLD is |
2159 | on this priority too, then make sure to recheck the | |
2160 | children we watch. This is because we only ever dequeue | |
2161 | the first signal per priority, and if we dequeue one, and | |
2162 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2163 | might have higher priority children we care about hence we | |
2164 | need to check that explicitly. */ | |
2165 | ||
2166 | if (sigismember(&d->sigset, SIGCHLD)) | |
2167 | e->need_process_child = true; | |
2168 | ||
2169 | /* If there's already an event source pending for this | |
2170 | * priority we don't read another */ | |
2171 | if (d->current) | |
2172 | return 0; | |
2173 | ||
fd38203a | 2174 | for (;;) { |
0eb2e0e3 | 2175 | struct signalfd_siginfo si; |
7057bd99 | 2176 | ssize_t n; |
92daebc0 | 2177 | sd_event_source *s = NULL; |
fd38203a | 2178 | |
9da4cb2b | 2179 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 2180 | if (n < 0) { |
fd38203a LP |
2181 | if (errno == EAGAIN || errno == EINTR) |
2182 | return read_one; | |
2183 | ||
2184 | return -errno; | |
2185 | } | |
2186 | ||
7057bd99 | 2187 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2188 | return -EIO; |
2189 | ||
7057bd99 ZJS |
2190 | assert(si.ssi_signo < _NSIG); |
2191 | ||
fd38203a LP |
2192 | read_one = true; |
2193 | ||
92daebc0 LP |
2194 | if (e->signal_sources) |
2195 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
2196 | if (!s) |
2197 | continue; | |
9da4cb2b LP |
2198 | if (s->pending) |
2199 | continue; | |
fd38203a LP |
2200 | |
2201 | s->signal.siginfo = si; | |
9da4cb2b LP |
2202 | d->current = s; |
2203 | ||
fd38203a LP |
2204 | r = source_set_pending(s, true); |
2205 | if (r < 0) | |
2206 | return r; | |
9da4cb2b LP |
2207 | |
2208 | return 1; | |
fd38203a | 2209 | } |
fd38203a LP |
2210 | } |
2211 | ||
2212 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 2213 | int r = 0; |
fd38203a LP |
2214 | |
2215 | assert(s); | |
6203e07a | 2216 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2217 | |
6203e07a | 2218 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
2219 | r = source_set_pending(s, false); |
2220 | if (r < 0) | |
2221 | return r; | |
2222 | } | |
fd38203a | 2223 | |
6e9feda3 LP |
2224 | if (s->type != SOURCE_POST) { |
2225 | sd_event_source *z; | |
2226 | Iterator i; | |
2227 | ||
2228 | /* If we execute a non-post source, let's mark all | |
2229 | * post sources as pending */ | |
2230 | ||
2231 | SET_FOREACH(z, s->event->post_sources, i) { | |
2232 | if (z->enabled == SD_EVENT_OFF) | |
2233 | continue; | |
2234 | ||
2235 | r = source_set_pending(z, true); | |
2236 | if (r < 0) | |
2237 | return r; | |
2238 | } | |
2239 | } | |
2240 | ||
baf76283 LP |
2241 | if (s->enabled == SD_EVENT_ONESHOT) { |
2242 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2243 | if (r < 0) |
2244 | return r; | |
2245 | } | |
2246 | ||
12179984 | 2247 | s->dispatching = true; |
b7484e2a | 2248 | |
fd38203a LP |
2249 | switch (s->type) { |
2250 | ||
2251 | case SOURCE_IO: | |
2252 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2253 | break; | |
2254 | ||
6a0f1f6d | 2255 | case SOURCE_TIME_REALTIME: |
a8548816 | 2256 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2257 | case SOURCE_TIME_MONOTONIC: |
2258 | case SOURCE_TIME_REALTIME_ALARM: | |
2259 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2260 | r = s->time.callback(s, s->time.next, s->userdata); |
2261 | break; | |
2262 | ||
2263 | case SOURCE_SIGNAL: | |
2264 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2265 | break; | |
2266 | ||
08cd1552 LP |
2267 | case SOURCE_CHILD: { |
2268 | bool zombie; | |
2269 | ||
2270 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
2271 | s->child.siginfo.si_code == CLD_KILLED || | |
2272 | s->child.siginfo.si_code == CLD_DUMPED; | |
2273 | ||
fd38203a | 2274 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2275 | |
2276 | /* Now, reap the PID for good. */ | |
2277 | if (zombie) | |
2278 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2279 | ||
fd38203a | 2280 | break; |
08cd1552 | 2281 | } |
fd38203a LP |
2282 | |
2283 | case SOURCE_DEFER: | |
2284 | r = s->defer.callback(s, s->userdata); | |
2285 | break; | |
da7e457c | 2286 | |
6e9feda3 LP |
2287 | case SOURCE_POST: |
2288 | r = s->post.callback(s, s->userdata); | |
2289 | break; | |
2290 | ||
6203e07a LP |
2291 | case SOURCE_EXIT: |
2292 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2293 | break; |
9d3e3aa5 LP |
2294 | |
2295 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2296 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2297 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2298 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2299 | } |
2300 | ||
12179984 LP |
2301 | s->dispatching = false; |
2302 | ||
55cbfaa5 DM |
2303 | if (r < 0) |
2304 | log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m", | |
2305 | strna(s->description), event_source_type_to_string(s->type)); | |
12179984 LP |
2306 | |
2307 | if (s->n_ref == 0) | |
2308 | source_free(s); | |
2309 | else if (r < 0) | |
6203e07a | 2310 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2311 | |
6203e07a | 2312 | return 1; |
fd38203a LP |
2313 | } |
2314 | ||
2315 | static int event_prepare(sd_event *e) { | |
2316 | int r; | |
2317 | ||
2318 | assert(e); | |
2319 | ||
2320 | for (;;) { | |
2321 | sd_event_source *s; | |
2322 | ||
2323 | s = prioq_peek(e->prepare); | |
baf76283 | 2324 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2325 | break; |
2326 | ||
2327 | s->prepare_iteration = e->iteration; | |
2328 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2329 | if (r < 0) | |
2330 | return r; | |
2331 | ||
2332 | assert(s->prepare); | |
12179984 LP |
2333 | |
2334 | s->dispatching = true; | |
fd38203a | 2335 | r = s->prepare(s, s->userdata); |
12179984 LP |
2336 | s->dispatching = false; |
2337 | ||
55cbfaa5 DM |
2338 | if (r < 0) |
2339 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m", | |
2340 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a | 2341 | |
12179984 LP |
2342 | if (s->n_ref == 0) |
2343 | source_free(s); | |
2344 | else if (r < 0) | |
2345 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2346 | } |
2347 | ||
2348 | return 0; | |
2349 | } | |
2350 | ||
6203e07a | 2351 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2352 | sd_event_source *p; |
2353 | int r; | |
2354 | ||
2355 | assert(e); | |
2356 | ||
6203e07a | 2357 | p = prioq_peek(e->exit); |
baf76283 | 2358 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2359 | e->state = SD_EVENT_FINISHED; |
2360 | return 0; | |
2361 | } | |
2362 | ||
2363 | sd_event_ref(e); | |
2364 | e->iteration++; | |
6203e07a | 2365 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2366 | |
2367 | r = source_dispatch(p); | |
2368 | ||
2b0c9ef7 | 2369 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2370 | sd_event_unref(e); |
2371 | ||
2372 | return r; | |
2373 | } | |
2374 | ||
c2ba3ad6 LP |
2375 | static sd_event_source* event_next_pending(sd_event *e) { |
2376 | sd_event_source *p; | |
2377 | ||
da7e457c LP |
2378 | assert(e); |
2379 | ||
c2ba3ad6 LP |
2380 | p = prioq_peek(e->pending); |
2381 | if (!p) | |
2382 | return NULL; | |
2383 | ||
baf76283 | 2384 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2385 | return NULL; |
2386 | ||
2387 | return p; | |
2388 | } | |
2389 | ||
cde93897 LP |
2390 | static int arm_watchdog(sd_event *e) { |
2391 | struct itimerspec its = {}; | |
2392 | usec_t t; | |
2393 | int r; | |
2394 | ||
2395 | assert(e); | |
2396 | assert(e->watchdog_fd >= 0); | |
2397 | ||
2398 | t = sleep_between(e, | |
2399 | e->watchdog_last + (e->watchdog_period / 2), | |
2400 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2401 | ||
2402 | timespec_store(&its.it_value, t); | |
2403 | ||
75145780 LP |
2404 | /* Make sure we never set the watchdog to 0, which tells the |
2405 | * kernel to disable it. */ | |
2406 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2407 | its.it_value.tv_nsec = 1; | |
2408 | ||
cde93897 LP |
2409 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2410 | if (r < 0) | |
2411 | return -errno; | |
2412 | ||
2413 | return 0; | |
2414 | } | |
2415 | ||
2416 | static int process_watchdog(sd_event *e) { | |
2417 | assert(e); | |
2418 | ||
2419 | if (!e->watchdog) | |
2420 | return 0; | |
2421 | ||
2422 | /* Don't notify watchdog too often */ | |
2423 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2424 | return 0; | |
2425 | ||
2426 | sd_notify(false, "WATCHDOG=1"); | |
2427 | e->watchdog_last = e->timestamp.monotonic; | |
2428 | ||
2429 | return arm_watchdog(e); | |
2430 | } | |
2431 | ||
c45a5a74 TG |
2432 | _public_ int sd_event_prepare(sd_event *e) { |
2433 | int r; | |
fd38203a | 2434 | |
da7e457c LP |
2435 | assert_return(e, -EINVAL); |
2436 | assert_return(!event_pid_changed(e), -ECHILD); | |
2437 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2438 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 2439 | |
6203e07a | 2440 | if (e->exit_requested) |
c45a5a74 | 2441 | goto pending; |
fd38203a LP |
2442 | |
2443 | e->iteration++; | |
2444 | ||
0be6c2f6 | 2445 | e->state = SD_EVENT_PREPARING; |
fd38203a | 2446 | r = event_prepare(e); |
0be6c2f6 | 2447 | e->state = SD_EVENT_INITIAL; |
fd38203a | 2448 | if (r < 0) |
c45a5a74 | 2449 | return r; |
fd38203a | 2450 | |
6a0f1f6d LP |
2451 | r = event_arm_timer(e, &e->realtime); |
2452 | if (r < 0) | |
c45a5a74 | 2453 | return r; |
6a0f1f6d | 2454 | |
a8548816 TG |
2455 | r = event_arm_timer(e, &e->boottime); |
2456 | if (r < 0) | |
c45a5a74 | 2457 | return r; |
a8548816 | 2458 | |
6a0f1f6d LP |
2459 | r = event_arm_timer(e, &e->monotonic); |
2460 | if (r < 0) | |
c45a5a74 | 2461 | return r; |
6a0f1f6d LP |
2462 | |
2463 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 2464 | if (r < 0) |
c45a5a74 | 2465 | return r; |
fd38203a | 2466 | |
6a0f1f6d | 2467 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 2468 | if (r < 0) |
c45a5a74 | 2469 | return r; |
fd38203a | 2470 | |
1b5995b0 | 2471 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
2472 | goto pending; |
2473 | ||
2b0c9ef7 | 2474 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
2475 | |
2476 | return 0; | |
2477 | ||
2478 | pending: | |
2b0c9ef7 | 2479 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2480 | r = sd_event_wait(e, 0); |
2481 | if (r == 0) | |
2b0c9ef7 | 2482 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2483 | |
2484 | return r; | |
c45a5a74 TG |
2485 | } |
2486 | ||
2487 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2488 | struct epoll_event *ev_queue; | |
2489 | unsigned ev_queue_max; | |
2490 | int r, m, i; | |
2491 | ||
2492 | assert_return(e, -EINVAL); | |
2493 | assert_return(!event_pid_changed(e), -ECHILD); | |
2494 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2495 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
2496 | |
2497 | if (e->exit_requested) { | |
2498 | e->state = SD_EVENT_PENDING; | |
2499 | return 1; | |
2500 | } | |
6a0f1f6d | 2501 | |
1c724e9e | 2502 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 2503 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 2504 | |
15b38f93 | 2505 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2506 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2507 | if (m < 0) { |
c45a5a74 TG |
2508 | if (errno == EINTR) { |
2509 | e->state = SD_EVENT_PENDING; | |
2510 | return 1; | |
2511 | } | |
2512 | ||
2513 | r = -errno; | |
da7e457c LP |
2514 | goto finish; |
2515 | } | |
fd38203a | 2516 | |
46e8c825 | 2517 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2518 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2519 | |
2520 | for (i = 0; i < m; i++) { | |
2521 | ||
9da4cb2b | 2522 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2523 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
9da4cb2b LP |
2524 | else { |
2525 | WakeupType *t = ev_queue[i].data.ptr; | |
2526 | ||
2527 | switch (*t) { | |
2528 | ||
2529 | case WAKEUP_EVENT_SOURCE: | |
2530 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2531 | break; | |
fd38203a | 2532 | |
9da4cb2b LP |
2533 | case WAKEUP_CLOCK_DATA: { |
2534 | struct clock_data *d = ev_queue[i].data.ptr; | |
2535 | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); | |
2536 | break; | |
2537 | } | |
2538 | ||
2539 | case WAKEUP_SIGNAL_DATA: | |
2540 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2541 | break; | |
2542 | ||
2543 | default: | |
2544 | assert_not_reached("Invalid wake-up pointer"); | |
2545 | } | |
2546 | } | |
fd38203a | 2547 | if (r < 0) |
da7e457c | 2548 | goto finish; |
fd38203a LP |
2549 | } |
2550 | ||
cde93897 LP |
2551 | r = process_watchdog(e); |
2552 | if (r < 0) | |
2553 | goto finish; | |
2554 | ||
6a0f1f6d LP |
2555 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2556 | if (r < 0) | |
2557 | goto finish; | |
2558 | ||
a8548816 TG |
2559 | r = process_timer(e, e->timestamp_boottime, &e->boottime); |
2560 | if (r < 0) | |
2561 | goto finish; | |
2562 | ||
6a0f1f6d LP |
2563 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2564 | if (r < 0) | |
2565 | goto finish; | |
2566 | ||
2567 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2568 | if (r < 0) |
da7e457c | 2569 | goto finish; |
fd38203a | 2570 | |
6a0f1f6d | 2571 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2572 | if (r < 0) |
da7e457c | 2573 | goto finish; |
fd38203a | 2574 | |
c2ba3ad6 | 2575 | if (e->need_process_child) { |
fd38203a LP |
2576 | r = process_child(e); |
2577 | if (r < 0) | |
da7e457c | 2578 | goto finish; |
fd38203a LP |
2579 | } |
2580 | ||
c45a5a74 TG |
2581 | if (event_next_pending(e)) { |
2582 | e->state = SD_EVENT_PENDING; | |
2583 | ||
2584 | return 1; | |
da7e457c LP |
2585 | } |
2586 | ||
c45a5a74 | 2587 | r = 0; |
fd38203a | 2588 | |
da7e457c | 2589 | finish: |
2b0c9ef7 | 2590 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2591 | |
2592 | return r; | |
fd38203a LP |
2593 | } |
2594 | ||
c45a5a74 TG |
2595 | _public_ int sd_event_dispatch(sd_event *e) { |
2596 | sd_event_source *p; | |
2597 | int r; | |
2598 | ||
2599 | assert_return(e, -EINVAL); | |
2600 | assert_return(!event_pid_changed(e), -ECHILD); | |
2601 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2602 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
2603 | ||
2604 | if (e->exit_requested) | |
2605 | return dispatch_exit(e); | |
2606 | ||
2607 | p = event_next_pending(e); | |
2608 | if (p) { | |
2609 | sd_event_ref(e); | |
2610 | ||
2611 | e->state = SD_EVENT_RUNNING; | |
2612 | r = source_dispatch(p); | |
2b0c9ef7 | 2613 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2614 | |
2615 | sd_event_unref(e); | |
2616 | ||
2617 | return r; | |
2618 | } | |
2619 | ||
2b0c9ef7 | 2620 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2621 | |
2622 | return 1; | |
2623 | } | |
2624 | ||
2625 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { | |
2626 | int r; | |
2627 | ||
2628 | assert_return(e, -EINVAL); | |
2629 | assert_return(!event_pid_changed(e), -ECHILD); | |
2630 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2631 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 TG |
2632 | |
2633 | r = sd_event_prepare(e); | |
53bac4e0 LP |
2634 | if (r == 0) |
2635 | /* There was nothing? Then wait... */ | |
2636 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 2637 | |
02d30981 | 2638 | if (r > 0) { |
53bac4e0 | 2639 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
2640 | r = sd_event_dispatch(e); |
2641 | if (r < 0) | |
2642 | return r; | |
53bac4e0 LP |
2643 | |
2644 | return 1; | |
2645 | } | |
2646 | ||
2647 | return r; | |
c45a5a74 TG |
2648 | } |
2649 | ||
f7262a9f | 2650 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2651 | int r; |
2652 | ||
da7e457c LP |
2653 | assert_return(e, -EINVAL); |
2654 | assert_return(!event_pid_changed(e), -ECHILD); | |
2b0c9ef7 | 2655 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c LP |
2656 | |
2657 | sd_event_ref(e); | |
fd38203a | 2658 | |
da7e457c | 2659 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2660 | r = sd_event_run(e, (uint64_t) -1); |
2661 | if (r < 0) | |
da7e457c | 2662 | goto finish; |
fd38203a LP |
2663 | } |
2664 | ||
6203e07a | 2665 | r = e->exit_code; |
da7e457c LP |
2666 | |
2667 | finish: | |
2668 | sd_event_unref(e); | |
2669 | return r; | |
fd38203a LP |
2670 | } |
2671 | ||
9b364545 TG |
2672 | _public_ int sd_event_get_fd(sd_event *e) { |
2673 | ||
2674 | assert_return(e, -EINVAL); | |
2675 | assert_return(!event_pid_changed(e), -ECHILD); | |
2676 | ||
2677 | return e->epoll_fd; | |
2678 | } | |
2679 | ||
f7262a9f | 2680 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2681 | assert_return(e, -EINVAL); |
2682 | assert_return(!event_pid_changed(e), -ECHILD); | |
2683 | ||
2684 | return e->state; | |
2685 | } | |
2686 | ||
6203e07a | 2687 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2688 | assert_return(e, -EINVAL); |
6203e07a | 2689 | assert_return(code, -EINVAL); |
da7e457c | 2690 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2691 | |
6203e07a LP |
2692 | if (!e->exit_requested) |
2693 | return -ENODATA; | |
2694 | ||
2695 | *code = e->exit_code; | |
2696 | return 0; | |
fd38203a LP |
2697 | } |
2698 | ||
6203e07a | 2699 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2700 | assert_return(e, -EINVAL); |
2701 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2702 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2703 | |
6203e07a LP |
2704 | e->exit_requested = true; |
2705 | e->exit_code = code; | |
2706 | ||
fd38203a LP |
2707 | return 0; |
2708 | } | |
46e8c825 | 2709 | |
6a0f1f6d | 2710 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2711 | assert_return(e, -EINVAL); |
2712 | assert_return(usec, -EINVAL); | |
46e8c825 LP |
2713 | assert_return(!event_pid_changed(e), -ECHILD); |
2714 | ||
38a03f06 LP |
2715 | if (!dual_timestamp_is_set(&e->timestamp)) { |
2716 | /* Implicitly fall back to now() if we never ran | |
2717 | * before and thus have no cached time. */ | |
2718 | *usec = now(clock); | |
2719 | return 1; | |
2720 | } | |
46e8c825 | 2721 | |
6a0f1f6d LP |
2722 | switch (clock) { |
2723 | ||
2724 | case CLOCK_REALTIME: | |
2725 | case CLOCK_REALTIME_ALARM: | |
2726 | *usec = e->timestamp.realtime; | |
2727 | break; | |
2728 | ||
2729 | case CLOCK_MONOTONIC: | |
2730 | *usec = e->timestamp.monotonic; | |
2731 | break; | |
2732 | ||
a8548816 | 2733 | case CLOCK_BOOTTIME: |
6a0f1f6d LP |
2734 | case CLOCK_BOOTTIME_ALARM: |
2735 | *usec = e->timestamp_boottime; | |
2736 | break; | |
2737 | } | |
46e8c825 | 2738 | |
46e8c825 LP |
2739 | return 0; |
2740 | } | |
afc6adb5 LP |
2741 | |
2742 | _public_ int sd_event_default(sd_event **ret) { | |
2743 | ||
ec202eae | 2744 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2745 | sd_event *e = NULL; |
afc6adb5 LP |
2746 | int r; |
2747 | ||
2748 | if (!ret) | |
2749 | return !!default_event; | |
2750 | ||
2751 | if (default_event) { | |
2752 | *ret = sd_event_ref(default_event); | |
2753 | return 0; | |
2754 | } | |
2755 | ||
2756 | r = sd_event_new(&e); | |
2757 | if (r < 0) | |
2758 | return r; | |
2759 | ||
2760 | e->default_event_ptr = &default_event; | |
2761 | e->tid = gettid(); | |
2762 | default_event = e; | |
2763 | ||
2764 | *ret = e; | |
2765 | return 1; | |
2766 | } | |
2767 | ||
2768 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2769 | assert_return(e, -EINVAL); | |
2770 | assert_return(tid, -EINVAL); | |
76b54375 | 2771 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2772 | |
76b54375 LP |
2773 | if (e->tid != 0) { |
2774 | *tid = e->tid; | |
2775 | return 0; | |
2776 | } | |
2777 | ||
2778 | return -ENXIO; | |
afc6adb5 | 2779 | } |
cde93897 LP |
2780 | |
2781 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2782 | int r; | |
2783 | ||
2784 | assert_return(e, -EINVAL); | |
8f726607 | 2785 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2786 | |
2787 | if (e->watchdog == !!b) | |
2788 | return e->watchdog; | |
2789 | ||
2790 | if (b) { | |
2791 | struct epoll_event ev = {}; | |
cde93897 | 2792 | |
09812eb7 LP |
2793 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2794 | if (r <= 0) | |
cde93897 | 2795 | return r; |
cde93897 LP |
2796 | |
2797 | /* Issue first ping immediately */ | |
2798 | sd_notify(false, "WATCHDOG=1"); | |
2799 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2800 | ||
2801 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2802 | if (e->watchdog_fd < 0) | |
2803 | return -errno; | |
2804 | ||
2805 | r = arm_watchdog(e); | |
2806 | if (r < 0) | |
2807 | goto fail; | |
2808 | ||
2809 | ev.events = EPOLLIN; | |
2810 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2811 | ||
2812 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2813 | if (r < 0) { | |
2814 | r = -errno; | |
2815 | goto fail; | |
2816 | } | |
2817 | ||
2818 | } else { | |
2819 | if (e->watchdog_fd >= 0) { | |
2820 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2821 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2822 | } |
2823 | } | |
2824 | ||
2825 | e->watchdog = !!b; | |
2826 | return e->watchdog; | |
2827 | ||
2828 | fail: | |
03e334a1 | 2829 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2830 | return r; |
2831 | } | |
8f726607 LP |
2832 | |
2833 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2834 | assert_return(e, -EINVAL); | |
2835 | assert_return(!event_pid_changed(e), -ECHILD); | |
2836 | ||
2837 | return e->watchdog; | |
2838 | } |