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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; |
34b87517 | 228 | bool profile_delays:1; |
afc6adb5 | 229 | |
6203e07a LP |
230 | int exit_code; |
231 | ||
afc6adb5 LP |
232 | pid_t tid; |
233 | sd_event **default_event_ptr; | |
cde93897 LP |
234 | |
235 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
236 | |
237 | unsigned n_sources; | |
a71fe8b8 LP |
238 | |
239 | LIST_HEAD(sd_event_source, sources); | |
34b87517 VC |
240 | |
241 | usec_t last_run, last_log; | |
242 | unsigned delays[sizeof(usec_t) * 8]; | |
fd38203a LP |
243 | }; |
244 | ||
a71fe8b8 LP |
245 | static void source_disconnect(sd_event_source *s); |
246 | ||
fd38203a LP |
247 | static int pending_prioq_compare(const void *a, const void *b) { |
248 | const sd_event_source *x = a, *y = b; | |
249 | ||
250 | assert(x->pending); | |
251 | assert(y->pending); | |
252 | ||
baf76283 LP |
253 | /* Enabled ones first */ |
254 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 255 | return -1; |
baf76283 | 256 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
257 | return 1; |
258 | ||
259 | /* Lower priority values first */ | |
260 | if (x->priority < y->priority) | |
261 | return -1; | |
262 | if (x->priority > y->priority) | |
263 | return 1; | |
264 | ||
265 | /* Older entries first */ | |
266 | if (x->pending_iteration < y->pending_iteration) | |
267 | return -1; | |
268 | if (x->pending_iteration > y->pending_iteration) | |
269 | return 1; | |
270 | ||
fd38203a LP |
271 | return 0; |
272 | } | |
273 | ||
274 | static int prepare_prioq_compare(const void *a, const void *b) { | |
275 | const sd_event_source *x = a, *y = b; | |
276 | ||
277 | assert(x->prepare); | |
278 | assert(y->prepare); | |
279 | ||
8046c457 KK |
280 | /* Enabled ones first */ |
281 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
282 | return -1; | |
283 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
284 | return 1; | |
285 | ||
fd38203a LP |
286 | /* Move most recently prepared ones last, so that we can stop |
287 | * preparing as soon as we hit one that has already been | |
288 | * prepared in the current iteration */ | |
289 | if (x->prepare_iteration < y->prepare_iteration) | |
290 | return -1; | |
291 | if (x->prepare_iteration > y->prepare_iteration) | |
292 | return 1; | |
293 | ||
fd38203a LP |
294 | /* Lower priority values first */ |
295 | if (x->priority < y->priority) | |
296 | return -1; | |
297 | if (x->priority > y->priority) | |
298 | return 1; | |
299 | ||
fd38203a LP |
300 | return 0; |
301 | } | |
302 | ||
c2ba3ad6 | 303 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
304 | const sd_event_source *x = a, *y = b; |
305 | ||
6a0f1f6d LP |
306 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
307 | assert(x->type == y->type); | |
fd38203a | 308 | |
baf76283 LP |
309 | /* Enabled ones first */ |
310 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 311 | return -1; |
baf76283 | 312 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
313 | return 1; |
314 | ||
315 | /* Move the pending ones to the end */ | |
316 | if (!x->pending && y->pending) | |
317 | return -1; | |
318 | if (x->pending && !y->pending) | |
319 | return 1; | |
320 | ||
321 | /* Order by time */ | |
322 | if (x->time.next < y->time.next) | |
323 | return -1; | |
324 | if (x->time.next > y->time.next) | |
a99badf5 | 325 | return 1; |
fd38203a | 326 | |
fd38203a LP |
327 | return 0; |
328 | } | |
329 | ||
1bce0ffa LP |
330 | static usec_t time_event_source_latest(const sd_event_source *s) { |
331 | return usec_add(s->time.next, s->time.accuracy); | |
332 | } | |
333 | ||
c2ba3ad6 LP |
334 | static int latest_time_prioq_compare(const void *a, const void *b) { |
335 | const sd_event_source *x = a, *y = b; | |
336 | ||
6a0f1f6d LP |
337 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
338 | assert(x->type == y->type); | |
c2ba3ad6 | 339 | |
baf76283 LP |
340 | /* Enabled ones first */ |
341 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 342 | return -1; |
baf76283 | 343 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
344 | return 1; |
345 | ||
346 | /* Move the pending ones to the end */ | |
347 | if (!x->pending && y->pending) | |
348 | return -1; | |
349 | if (x->pending && !y->pending) | |
350 | return 1; | |
351 | ||
352 | /* Order by time */ | |
1bce0ffa | 353 | if (time_event_source_latest(x) < time_event_source_latest(y)) |
c2ba3ad6 | 354 | return -1; |
1bce0ffa | 355 | if (time_event_source_latest(x) > time_event_source_latest(y)) |
a99badf5 | 356 | return 1; |
c2ba3ad6 | 357 | |
c2ba3ad6 LP |
358 | return 0; |
359 | } | |
360 | ||
6203e07a | 361 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
362 | const sd_event_source *x = a, *y = b; |
363 | ||
6203e07a LP |
364 | assert(x->type == SOURCE_EXIT); |
365 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 366 | |
baf76283 LP |
367 | /* Enabled ones first */ |
368 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 369 | return -1; |
baf76283 | 370 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
371 | return 1; |
372 | ||
373 | /* Lower priority values first */ | |
374 | if (x->priority < y->priority) | |
375 | return -1; | |
376 | if (x->priority > y->priority) | |
377 | return 1; | |
378 | ||
da7e457c LP |
379 | return 0; |
380 | } | |
381 | ||
6a0f1f6d LP |
382 | static void free_clock_data(struct clock_data *d) { |
383 | assert(d); | |
9da4cb2b | 384 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
385 | |
386 | safe_close(d->fd); | |
387 | prioq_free(d->earliest); | |
388 | prioq_free(d->latest); | |
389 | } | |
390 | ||
fd38203a | 391 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
392 | sd_event_source *s; |
393 | ||
fd38203a | 394 | assert(e); |
a71fe8b8 LP |
395 | |
396 | while ((s = e->sources)) { | |
397 | assert(s->floating); | |
398 | source_disconnect(s); | |
399 | sd_event_source_unref(s); | |
400 | } | |
401 | ||
15b38f93 | 402 | assert(e->n_sources == 0); |
fd38203a | 403 | |
afc6adb5 LP |
404 | if (e->default_event_ptr) |
405 | *(e->default_event_ptr) = NULL; | |
406 | ||
03e334a1 | 407 | safe_close(e->epoll_fd); |
03e334a1 | 408 | safe_close(e->watchdog_fd); |
cde93897 | 409 | |
6a0f1f6d | 410 | free_clock_data(&e->realtime); |
a8548816 | 411 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
412 | free_clock_data(&e->monotonic); |
413 | free_clock_data(&e->realtime_alarm); | |
414 | free_clock_data(&e->boottime_alarm); | |
415 | ||
fd38203a LP |
416 | prioq_free(e->pending); |
417 | prioq_free(e->prepare); | |
6203e07a | 418 | prioq_free(e->exit); |
fd38203a LP |
419 | |
420 | free(e->signal_sources); | |
9da4cb2b | 421 | hashmap_free(e->signal_data); |
fd38203a LP |
422 | |
423 | hashmap_free(e->child_sources); | |
6e9feda3 | 424 | set_free(e->post_sources); |
fd38203a LP |
425 | free(e); |
426 | } | |
427 | ||
f7262a9f | 428 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
429 | sd_event *e; |
430 | int r; | |
431 | ||
305f78bf | 432 | assert_return(ret, -EINVAL); |
fd38203a LP |
433 | |
434 | e = new0(sd_event, 1); | |
435 | if (!e) | |
436 | return -ENOMEM; | |
437 | ||
da7e457c | 438 | e->n_ref = 1; |
9da4cb2b | 439 | 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 | 440 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
9da4cb2b | 441 | e->realtime.wakeup = e->boottime.wakeup = e->monotonic.wakeup = e->realtime_alarm.wakeup = e->boottime_alarm.wakeup = WAKEUP_CLOCK_DATA; |
eaa3cbef | 442 | e->original_pid = getpid(); |
3a43da28 | 443 | e->perturb = USEC_INFINITY; |
fd38203a | 444 | |
c983e776 EV |
445 | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
446 | if (r < 0) | |
fd38203a | 447 | goto fail; |
fd38203a LP |
448 | |
449 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
450 | if (e->epoll_fd < 0) { | |
451 | r = -errno; | |
452 | goto fail; | |
453 | } | |
454 | ||
34b87517 | 455 | if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) { |
34a6843d | 456 | log_debug("Event loop profiling enabled. Logarithmic histogram of event loop iterations in the range 2^0 ... 2^63 us will be logged every 5s."); |
34b87517 VC |
457 | e->profile_delays = true; |
458 | } | |
459 | ||
fd38203a LP |
460 | *ret = e; |
461 | return 0; | |
462 | ||
463 | fail: | |
464 | event_free(e); | |
465 | return r; | |
466 | } | |
467 | ||
f7262a9f | 468 | _public_ sd_event* sd_event_ref(sd_event *e) { |
6680dd6b LP |
469 | |
470 | if (!e) | |
471 | return NULL; | |
fd38203a | 472 | |
da7e457c LP |
473 | assert(e->n_ref >= 1); |
474 | e->n_ref++; | |
fd38203a LP |
475 | |
476 | return e; | |
477 | } | |
478 | ||
f7262a9f | 479 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
480 | |
481 | if (!e) | |
482 | return NULL; | |
fd38203a | 483 | |
da7e457c LP |
484 | assert(e->n_ref >= 1); |
485 | e->n_ref--; | |
486 | ||
487 | if (e->n_ref <= 0) | |
fd38203a LP |
488 | event_free(e); |
489 | ||
490 | return NULL; | |
491 | } | |
492 | ||
eaa3cbef LP |
493 | static bool event_pid_changed(sd_event *e) { |
494 | assert(e); | |
495 | ||
a2360a46 | 496 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
497 | * it around over a fork(). Let's complain. */ |
498 | ||
499 | return e->original_pid != getpid(); | |
500 | } | |
501 | ||
366e6411 | 502 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
503 | int r; |
504 | ||
505 | assert(s); | |
506 | assert(s->type == SOURCE_IO); | |
507 | ||
f6806734 | 508 | if (event_pid_changed(s->event)) |
366e6411 | 509 | return; |
f6806734 | 510 | |
fd38203a | 511 | if (!s->io.registered) |
366e6411 | 512 | return; |
fd38203a LP |
513 | |
514 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
556c25cf | 515 | if (r < 0) |
55cbfaa5 DM |
516 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m", |
517 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a LP |
518 | |
519 | s->io.registered = false; | |
fd38203a LP |
520 | } |
521 | ||
305f78bf LP |
522 | static int source_io_register( |
523 | sd_event_source *s, | |
524 | int enabled, | |
525 | uint32_t events) { | |
526 | ||
fd38203a LP |
527 | struct epoll_event ev = {}; |
528 | int r; | |
529 | ||
530 | assert(s); | |
531 | assert(s->type == SOURCE_IO); | |
baf76283 | 532 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
533 | |
534 | ev.events = events; | |
535 | ev.data.ptr = s; | |
536 | ||
baf76283 | 537 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
538 | ev.events |= EPOLLONESHOT; |
539 | ||
540 | if (s->io.registered) | |
541 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
542 | else | |
543 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
fd38203a LP |
544 | if (r < 0) |
545 | return -errno; | |
546 | ||
547 | s->io.registered = true; | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
6a0f1f6d LP |
552 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
553 | ||
554 | switch (t) { | |
555 | ||
556 | case SOURCE_TIME_REALTIME: | |
557 | return CLOCK_REALTIME; | |
558 | ||
a8548816 TG |
559 | case SOURCE_TIME_BOOTTIME: |
560 | return CLOCK_BOOTTIME; | |
561 | ||
6a0f1f6d LP |
562 | case SOURCE_TIME_MONOTONIC: |
563 | return CLOCK_MONOTONIC; | |
564 | ||
565 | case SOURCE_TIME_REALTIME_ALARM: | |
566 | return CLOCK_REALTIME_ALARM; | |
567 | ||
568 | case SOURCE_TIME_BOOTTIME_ALARM: | |
569 | return CLOCK_BOOTTIME_ALARM; | |
570 | ||
571 | default: | |
572 | return (clockid_t) -1; | |
573 | } | |
574 | } | |
575 | ||
576 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
577 | ||
578 | switch (clock) { | |
579 | ||
580 | case CLOCK_REALTIME: | |
581 | return SOURCE_TIME_REALTIME; | |
582 | ||
a8548816 TG |
583 | case CLOCK_BOOTTIME: |
584 | return SOURCE_TIME_BOOTTIME; | |
585 | ||
6a0f1f6d LP |
586 | case CLOCK_MONOTONIC: |
587 | return SOURCE_TIME_MONOTONIC; | |
588 | ||
589 | case CLOCK_REALTIME_ALARM: | |
590 | return SOURCE_TIME_REALTIME_ALARM; | |
591 | ||
592 | case CLOCK_BOOTTIME_ALARM: | |
593 | return SOURCE_TIME_BOOTTIME_ALARM; | |
594 | ||
595 | default: | |
596 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
597 | } | |
598 | } | |
599 | ||
600 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
601 | assert(e); | |
602 | ||
603 | switch (t) { | |
604 | ||
605 | case SOURCE_TIME_REALTIME: | |
606 | return &e->realtime; | |
607 | ||
a8548816 TG |
608 | case SOURCE_TIME_BOOTTIME: |
609 | return &e->boottime; | |
610 | ||
6a0f1f6d LP |
611 | case SOURCE_TIME_MONOTONIC: |
612 | return &e->monotonic; | |
613 | ||
614 | case SOURCE_TIME_REALTIME_ALARM: | |
615 | return &e->realtime_alarm; | |
616 | ||
617 | case SOURCE_TIME_BOOTTIME_ALARM: | |
618 | return &e->boottime_alarm; | |
619 | ||
620 | default: | |
621 | return NULL; | |
622 | } | |
623 | } | |
624 | ||
9da4cb2b LP |
625 | static int event_make_signal_data( |
626 | sd_event *e, | |
627 | int sig, | |
628 | struct signal_data **ret) { | |
4807d2d0 | 629 | |
f95387cd | 630 | struct epoll_event ev = {}; |
9da4cb2b LP |
631 | struct signal_data *d; |
632 | bool added = false; | |
633 | sigset_t ss_copy; | |
634 | int64_t priority; | |
f95387cd ZJS |
635 | int r; |
636 | ||
637 | assert(e); | |
638 | ||
f6806734 | 639 | if (event_pid_changed(e)) |
9da4cb2b | 640 | return -ECHILD; |
f6806734 | 641 | |
9da4cb2b LP |
642 | if (e->signal_sources && e->signal_sources[sig]) |
643 | priority = e->signal_sources[sig]->priority; | |
644 | else | |
645 | priority = 0; | |
f95387cd | 646 | |
9da4cb2b LP |
647 | d = hashmap_get(e->signal_data, &priority); |
648 | if (d) { | |
649 | if (sigismember(&d->sigset, sig) > 0) { | |
650 | if (ret) | |
651 | *ret = d; | |
652 | return 0; | |
653 | } | |
654 | } else { | |
655 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); | |
656 | if (r < 0) | |
657 | return r; | |
658 | ||
659 | d = new0(struct signal_data, 1); | |
660 | if (!d) | |
661 | return -ENOMEM; | |
662 | ||
663 | d->wakeup = WAKEUP_SIGNAL_DATA; | |
664 | d->fd = -1; | |
665 | d->priority = priority; | |
666 | ||
667 | r = hashmap_put(e->signal_data, &d->priority, d); | |
90f604d1 ZJS |
668 | if (r < 0) { |
669 | free(d); | |
9da4cb2b | 670 | return r; |
90f604d1 | 671 | } |
f95387cd | 672 | |
9da4cb2b LP |
673 | added = true; |
674 | } | |
675 | ||
676 | ss_copy = d->sigset; | |
677 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
678 | ||
679 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
680 | if (r < 0) { | |
681 | r = -errno; | |
682 | goto fail; | |
683 | } | |
684 | ||
685 | d->sigset = ss_copy; | |
f95387cd | 686 | |
9da4cb2b LP |
687 | if (d->fd >= 0) { |
688 | if (ret) | |
689 | *ret = d; | |
f95387cd | 690 | return 0; |
9da4cb2b LP |
691 | } |
692 | ||
693 | d->fd = r; | |
f95387cd ZJS |
694 | |
695 | ev.events = EPOLLIN; | |
9da4cb2b | 696 | ev.data.ptr = d; |
f95387cd | 697 | |
9da4cb2b LP |
698 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
699 | if (r < 0) { | |
700 | r = -errno; | |
701 | goto fail; | |
f95387cd ZJS |
702 | } |
703 | ||
9da4cb2b LP |
704 | if (ret) |
705 | *ret = d; | |
706 | ||
f95387cd | 707 | return 0; |
9da4cb2b LP |
708 | |
709 | fail: | |
710 | if (added) { | |
711 | d->fd = safe_close(d->fd); | |
712 | hashmap_remove(e->signal_data, &d->priority); | |
713 | free(d); | |
714 | } | |
715 | ||
716 | return r; | |
717 | } | |
718 | ||
719 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
720 | assert(e); | |
721 | assert(d); | |
722 | ||
723 | /* Turns off the specified signal in the signal data | |
724 | * object. If the signal mask of the object becomes empty that | |
725 | * way removes it. */ | |
726 | ||
727 | if (sigismember(&d->sigset, sig) == 0) | |
728 | return; | |
729 | ||
730 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
731 | ||
732 | if (sigisemptyset(&d->sigset)) { | |
733 | ||
734 | /* If all the mask is all-zero we can get rid of the structure */ | |
735 | hashmap_remove(e->signal_data, &d->priority); | |
736 | assert(!d->current); | |
737 | safe_close(d->fd); | |
738 | free(d); | |
739 | return; | |
740 | } | |
741 | ||
742 | assert(d->fd >= 0); | |
743 | ||
744 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
745 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
746 | } | |
747 | ||
748 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
749 | struct signal_data *d; | |
750 | static const int64_t zero_priority = 0; | |
751 | ||
752 | assert(e); | |
753 | ||
754 | /* Rechecks if the specified signal is still something we are | |
755 | * interested in. If not, we'll unmask it, and possibly drop | |
756 | * the signalfd for it. */ | |
757 | ||
758 | if (sig == SIGCHLD && | |
759 | e->n_enabled_child_sources > 0) | |
760 | return; | |
761 | ||
762 | if (e->signal_sources && | |
763 | e->signal_sources[sig] && | |
764 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
765 | return; | |
766 | ||
767 | /* | |
768 | * The specified signal might be enabled in three different queues: | |
769 | * | |
770 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
771 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
772 | * 3) the 0 priority (to cover the SIGCHLD case) | |
773 | * | |
774 | * Hence, let's remove it from all three here. | |
775 | */ | |
776 | ||
777 | if (priority) { | |
778 | d = hashmap_get(e->signal_data, priority); | |
779 | if (d) | |
780 | event_unmask_signal_data(e, d, sig); | |
781 | } | |
782 | ||
783 | if (e->signal_sources && e->signal_sources[sig]) { | |
784 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
785 | if (d) | |
786 | event_unmask_signal_data(e, d, sig); | |
787 | } | |
788 | ||
789 | d = hashmap_get(e->signal_data, &zero_priority); | |
790 | if (d) | |
791 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
792 | } |
793 | ||
a71fe8b8 LP |
794 | static void source_disconnect(sd_event_source *s) { |
795 | sd_event *event; | |
796 | ||
fd38203a LP |
797 | assert(s); |
798 | ||
a71fe8b8 LP |
799 | if (!s->event) |
800 | return; | |
15b38f93 | 801 | |
a71fe8b8 | 802 | assert(s->event->n_sources > 0); |
fd38203a | 803 | |
a71fe8b8 | 804 | switch (s->type) { |
fd38203a | 805 | |
a71fe8b8 LP |
806 | case SOURCE_IO: |
807 | if (s->io.fd >= 0) | |
808 | source_io_unregister(s); | |
fd38203a | 809 | |
a71fe8b8 | 810 | break; |
6a0f1f6d | 811 | |
a71fe8b8 | 812 | case SOURCE_TIME_REALTIME: |
a8548816 | 813 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
814 | case SOURCE_TIME_MONOTONIC: |
815 | case SOURCE_TIME_REALTIME_ALARM: | |
816 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
817 | struct clock_data *d; | |
fd38203a | 818 | |
a71fe8b8 LP |
819 | d = event_get_clock_data(s->event, s->type); |
820 | assert(d); | |
821 | ||
822 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
823 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 824 | d->needs_rearm = true; |
a71fe8b8 LP |
825 | break; |
826 | } | |
827 | ||
828 | case SOURCE_SIGNAL: | |
829 | if (s->signal.sig > 0) { | |
9da4cb2b | 830 | |
a71fe8b8 LP |
831 | if (s->event->signal_sources) |
832 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 833 | |
9da4cb2b | 834 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 835 | } |
fd38203a | 836 | |
a71fe8b8 | 837 | break; |
fd38203a | 838 | |
a71fe8b8 LP |
839 | case SOURCE_CHILD: |
840 | if (s->child.pid > 0) { | |
841 | if (s->enabled != SD_EVENT_OFF) { | |
842 | assert(s->event->n_enabled_child_sources > 0); | |
843 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 844 | } |
fd38203a | 845 | |
4a0b58c4 | 846 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
9da4cb2b | 847 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
a71fe8b8 | 848 | } |
fd38203a | 849 | |
a71fe8b8 | 850 | break; |
fd38203a | 851 | |
a71fe8b8 LP |
852 | case SOURCE_DEFER: |
853 | /* nothing */ | |
854 | break; | |
fd38203a | 855 | |
a71fe8b8 LP |
856 | case SOURCE_POST: |
857 | set_remove(s->event->post_sources, s); | |
858 | break; | |
da7e457c | 859 | |
a71fe8b8 LP |
860 | case SOURCE_EXIT: |
861 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
862 | break; | |
0eb2e0e3 | 863 | |
a71fe8b8 LP |
864 | default: |
865 | assert_not_reached("Wut? I shouldn't exist."); | |
866 | } | |
6e9feda3 | 867 | |
a71fe8b8 LP |
868 | if (s->pending) |
869 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 870 | |
a71fe8b8 LP |
871 | if (s->prepare) |
872 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 873 | |
a71fe8b8 | 874 | event = s->event; |
fd38203a | 875 | |
a71fe8b8 LP |
876 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
877 | s->event = NULL; | |
878 | LIST_REMOVE(sources, event->sources, s); | |
879 | event->n_sources--; | |
fd38203a | 880 | |
a71fe8b8 LP |
881 | if (!s->floating) |
882 | sd_event_unref(event); | |
883 | } | |
884 | ||
885 | static void source_free(sd_event_source *s) { | |
886 | assert(s); | |
fd38203a | 887 | |
a71fe8b8 | 888 | source_disconnect(s); |
356779df | 889 | free(s->description); |
fd38203a LP |
890 | free(s); |
891 | } | |
892 | ||
893 | static int source_set_pending(sd_event_source *s, bool b) { | |
894 | int r; | |
895 | ||
896 | assert(s); | |
6203e07a | 897 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
898 | |
899 | if (s->pending == b) | |
900 | return 0; | |
901 | ||
902 | s->pending = b; | |
903 | ||
904 | if (b) { | |
905 | s->pending_iteration = s->event->iteration; | |
906 | ||
907 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
908 | if (r < 0) { | |
909 | s->pending = false; | |
910 | return r; | |
911 | } | |
912 | } else | |
913 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
914 | ||
6a0f1f6d LP |
915 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
916 | struct clock_data *d; | |
917 | ||
918 | d = event_get_clock_data(s->event, s->type); | |
919 | assert(d); | |
920 | ||
921 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
922 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 923 | d->needs_rearm = true; |
2576a19e LP |
924 | } |
925 | ||
9da4cb2b LP |
926 | if (s->type == SOURCE_SIGNAL && !b) { |
927 | struct signal_data *d; | |
928 | ||
929 | d = hashmap_get(s->event->signal_data, &s->priority); | |
930 | if (d && d->current == s) | |
931 | d->current = NULL; | |
932 | } | |
933 | ||
fd38203a LP |
934 | return 0; |
935 | } | |
936 | ||
a71fe8b8 | 937 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
938 | sd_event_source *s; |
939 | ||
940 | assert(e); | |
941 | ||
942 | s = new0(sd_event_source, 1); | |
943 | if (!s) | |
944 | return NULL; | |
945 | ||
da7e457c | 946 | s->n_ref = 1; |
a71fe8b8 | 947 | s->event = e; |
4a134c49 | 948 | s->floating = floating; |
fd38203a | 949 | s->type = type; |
fd38203a | 950 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
951 | |
952 | if (!floating) | |
953 | sd_event_ref(e); | |
fd38203a | 954 | |
a71fe8b8 | 955 | LIST_PREPEND(sources, e->sources, s); |
15b38f93 LP |
956 | e->n_sources ++; |
957 | ||
fd38203a LP |
958 | return s; |
959 | } | |
960 | ||
f7262a9f | 961 | _public_ int sd_event_add_io( |
fd38203a | 962 | sd_event *e, |
151b9b96 | 963 | sd_event_source **ret, |
fd38203a LP |
964 | int fd, |
965 | uint32_t events, | |
718db961 | 966 | sd_event_io_handler_t callback, |
151b9b96 | 967 | void *userdata) { |
fd38203a LP |
968 | |
969 | sd_event_source *s; | |
970 | int r; | |
971 | ||
305f78bf | 972 | assert_return(e, -EINVAL); |
8ac43fee | 973 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 974 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 975 | assert_return(callback, -EINVAL); |
da7e457c | 976 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 977 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 978 | |
a71fe8b8 | 979 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
980 | if (!s) |
981 | return -ENOMEM; | |
982 | ||
9da4cb2b | 983 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
984 | s->io.fd = fd; |
985 | s->io.events = events; | |
986 | s->io.callback = callback; | |
987 | s->userdata = userdata; | |
baf76283 | 988 | s->enabled = SD_EVENT_ON; |
fd38203a | 989 | |
baf76283 | 990 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
991 | if (r < 0) { |
992 | source_free(s); | |
050f74f2 | 993 | return r; |
fd38203a LP |
994 | } |
995 | ||
a71fe8b8 LP |
996 | if (ret) |
997 | *ret = s; | |
998 | ||
fd38203a LP |
999 | return 0; |
1000 | } | |
1001 | ||
52444dc4 LP |
1002 | static void initialize_perturb(sd_event *e) { |
1003 | sd_id128_t bootid = {}; | |
1004 | ||
1005 | /* When we sleep for longer, we try to realign the wakeup to | |
1006 | the same time wihtin each minute/second/250ms, so that | |
1007 | events all across the system can be coalesced into a single | |
1008 | CPU wakeup. However, let's take some system-specific | |
1009 | randomness for this value, so that in a network of systems | |
1010 | with synced clocks timer events are distributed a | |
1011 | bit. Here, we calculate a perturbation usec offset from the | |
1012 | boot ID. */ | |
1013 | ||
3a43da28 | 1014 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
1015 | return; |
1016 | ||
1017 | if (sd_id128_get_boot(&bootid) >= 0) | |
1018 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
1019 | } | |
1020 | ||
fd38203a LP |
1021 | static int event_setup_timer_fd( |
1022 | sd_event *e, | |
6a0f1f6d LP |
1023 | struct clock_data *d, |
1024 | clockid_t clock) { | |
fd38203a LP |
1025 | |
1026 | struct epoll_event ev = {}; | |
1027 | int r, fd; | |
1028 | ||
1029 | assert(e); | |
6a0f1f6d | 1030 | assert(d); |
fd38203a | 1031 | |
6a0f1f6d | 1032 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
1033 | return 0; |
1034 | ||
6a0f1f6d | 1035 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
1036 | if (fd < 0) |
1037 | return -errno; | |
1038 | ||
1039 | ev.events = EPOLLIN; | |
9da4cb2b | 1040 | ev.data.ptr = d; |
fd38203a LP |
1041 | |
1042 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
1043 | if (r < 0) { | |
03e334a1 | 1044 | safe_close(fd); |
fd38203a LP |
1045 | return -errno; |
1046 | } | |
1047 | ||
6a0f1f6d | 1048 | d->fd = fd; |
fd38203a LP |
1049 | return 0; |
1050 | } | |
1051 | ||
c4f1aff2 TG |
1052 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1053 | assert(s); | |
1054 | ||
1055 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1056 | } | |
1057 | ||
6a0f1f6d | 1058 | _public_ int sd_event_add_time( |
fd38203a | 1059 | sd_event *e, |
151b9b96 | 1060 | sd_event_source **ret, |
6a0f1f6d | 1061 | clockid_t clock, |
fd38203a | 1062 | uint64_t usec, |
c2ba3ad6 | 1063 | uint64_t accuracy, |
718db961 | 1064 | sd_event_time_handler_t callback, |
151b9b96 | 1065 | void *userdata) { |
fd38203a | 1066 | |
6a0f1f6d | 1067 | EventSourceType type; |
fd38203a | 1068 | sd_event_source *s; |
6a0f1f6d | 1069 | struct clock_data *d; |
fd38203a LP |
1070 | int r; |
1071 | ||
305f78bf | 1072 | assert_return(e, -EINVAL); |
305f78bf LP |
1073 | assert_return(usec != (uint64_t) -1, -EINVAL); |
1074 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
da7e457c | 1075 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1076 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1077 | |
c4f1aff2 TG |
1078 | if (!callback) |
1079 | callback = time_exit_callback; | |
1080 | ||
6a0f1f6d | 1081 | type = clock_to_event_source_type(clock); |
15411c0c | 1082 | assert_return(type >= 0, -EOPNOTSUPP); |
6a0f1f6d LP |
1083 | |
1084 | d = event_get_clock_data(e, type); | |
1085 | assert(d); | |
c2ba3ad6 | 1086 | |
c983e776 EV |
1087 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1088 | if (r < 0) | |
1089 | return r; | |
fd38203a | 1090 | |
c983e776 EV |
1091 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1092 | if (r < 0) | |
1093 | return r; | |
fd38203a | 1094 | |
6a0f1f6d LP |
1095 | if (d->fd < 0) { |
1096 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1097 | if (r < 0) |
1098 | return r; | |
1099 | } | |
1100 | ||
a71fe8b8 | 1101 | s = source_new(e, !ret, type); |
fd38203a LP |
1102 | if (!s) |
1103 | return -ENOMEM; | |
1104 | ||
1105 | s->time.next = usec; | |
c2ba3ad6 | 1106 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1107 | s->time.callback = callback; |
da7e457c | 1108 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1109 | s->userdata = userdata; |
baf76283 | 1110 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1111 | |
e07bbb7c TG |
1112 | d->needs_rearm = true; |
1113 | ||
6a0f1f6d | 1114 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
1115 | if (r < 0) |
1116 | goto fail; | |
1117 | ||
6a0f1f6d | 1118 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
1119 | if (r < 0) |
1120 | goto fail; | |
fd38203a | 1121 | |
a71fe8b8 LP |
1122 | if (ret) |
1123 | *ret = s; | |
1124 | ||
fd38203a | 1125 | return 0; |
c2ba3ad6 LP |
1126 | |
1127 | fail: | |
1128 | source_free(s); | |
1129 | return r; | |
fd38203a LP |
1130 | } |
1131 | ||
59bc1fd7 LP |
1132 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1133 | assert(s); | |
1134 | ||
1135 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1136 | } | |
1137 | ||
f7262a9f | 1138 | _public_ int sd_event_add_signal( |
305f78bf | 1139 | sd_event *e, |
151b9b96 | 1140 | sd_event_source **ret, |
305f78bf | 1141 | int sig, |
718db961 | 1142 | sd_event_signal_handler_t callback, |
151b9b96 | 1143 | void *userdata) { |
305f78bf | 1144 | |
fd38203a | 1145 | sd_event_source *s; |
9da4cb2b | 1146 | struct signal_data *d; |
3022d74b | 1147 | sigset_t ss; |
fd38203a LP |
1148 | int r; |
1149 | ||
305f78bf LP |
1150 | assert_return(e, -EINVAL); |
1151 | assert_return(sig > 0, -EINVAL); | |
1152 | assert_return(sig < _NSIG, -EINVAL); | |
da7e457c | 1153 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1154 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1155 | |
59bc1fd7 LP |
1156 | if (!callback) |
1157 | callback = signal_exit_callback; | |
1158 | ||
3022d74b | 1159 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
50e0d56c LP |
1160 | if (r != 0) |
1161 | return -r; | |
3022d74b LP |
1162 | |
1163 | if (!sigismember(&ss, sig)) | |
1164 | return -EBUSY; | |
1165 | ||
fd38203a LP |
1166 | if (!e->signal_sources) { |
1167 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1168 | if (!e->signal_sources) | |
1169 | return -ENOMEM; | |
1170 | } else if (e->signal_sources[sig]) | |
1171 | return -EBUSY; | |
1172 | ||
a71fe8b8 | 1173 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1174 | if (!s) |
1175 | return -ENOMEM; | |
1176 | ||
1177 | s->signal.sig = sig; | |
1178 | s->signal.callback = callback; | |
1179 | s->userdata = userdata; | |
baf76283 | 1180 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1181 | |
1182 | e->signal_sources[sig] = s; | |
fd38203a | 1183 | |
9da4cb2b LP |
1184 | r = event_make_signal_data(e, sig, &d); |
1185 | if (r < 0) { | |
1186 | source_free(s); | |
1187 | return r; | |
fd38203a LP |
1188 | } |
1189 | ||
f1f00dbb LP |
1190 | /* Use the signal name as description for the event source by default */ |
1191 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1192 | ||
a71fe8b8 LP |
1193 | if (ret) |
1194 | *ret = s; | |
1195 | ||
fd38203a LP |
1196 | return 0; |
1197 | } | |
1198 | ||
f7262a9f | 1199 | _public_ int sd_event_add_child( |
305f78bf | 1200 | sd_event *e, |
151b9b96 | 1201 | sd_event_source **ret, |
305f78bf LP |
1202 | pid_t pid, |
1203 | int options, | |
718db961 | 1204 | sd_event_child_handler_t callback, |
151b9b96 | 1205 | void *userdata) { |
305f78bf | 1206 | |
fd38203a LP |
1207 | sd_event_source *s; |
1208 | int r; | |
1209 | ||
305f78bf LP |
1210 | assert_return(e, -EINVAL); |
1211 | assert_return(pid > 1, -EINVAL); | |
1212 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1213 | assert_return(options != 0, -EINVAL); | |
1214 | assert_return(callback, -EINVAL); | |
da7e457c | 1215 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1216 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1217 | |
d5099efc | 1218 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1219 | if (r < 0) |
1220 | return r; | |
1221 | ||
4a0b58c4 | 1222 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1223 | return -EBUSY; |
1224 | ||
a71fe8b8 | 1225 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1226 | if (!s) |
1227 | return -ENOMEM; | |
1228 | ||
1229 | s->child.pid = pid; | |
1230 | s->child.options = options; | |
1231 | s->child.callback = callback; | |
1232 | s->userdata = userdata; | |
baf76283 | 1233 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1234 | |
4a0b58c4 | 1235 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
fd38203a LP |
1236 | if (r < 0) { |
1237 | source_free(s); | |
1238 | return r; | |
1239 | } | |
1240 | ||
baf76283 | 1241 | e->n_enabled_child_sources ++; |
fd38203a | 1242 | |
9da4cb2b LP |
1243 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1244 | if (r < 0) { | |
1245 | e->n_enabled_child_sources--; | |
1246 | source_free(s); | |
1247 | return r; | |
fd38203a LP |
1248 | } |
1249 | ||
c2ba3ad6 LP |
1250 | e->need_process_child = true; |
1251 | ||
a71fe8b8 LP |
1252 | if (ret) |
1253 | *ret = s; | |
1254 | ||
fd38203a LP |
1255 | return 0; |
1256 | } | |
1257 | ||
f7262a9f | 1258 | _public_ int sd_event_add_defer( |
305f78bf | 1259 | sd_event *e, |
151b9b96 | 1260 | sd_event_source **ret, |
718db961 | 1261 | sd_event_handler_t callback, |
151b9b96 | 1262 | void *userdata) { |
305f78bf | 1263 | |
fd38203a LP |
1264 | sd_event_source *s; |
1265 | int r; | |
1266 | ||
305f78bf LP |
1267 | assert_return(e, -EINVAL); |
1268 | assert_return(callback, -EINVAL); | |
da7e457c | 1269 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1270 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1271 | |
a71fe8b8 | 1272 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1273 | if (!s) |
1274 | return -ENOMEM; | |
1275 | ||
1276 | s->defer.callback = callback; | |
1277 | s->userdata = userdata; | |
baf76283 | 1278 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1279 | |
1280 | r = source_set_pending(s, true); | |
1281 | if (r < 0) { | |
1282 | source_free(s); | |
1283 | return r; | |
1284 | } | |
1285 | ||
a71fe8b8 LP |
1286 | if (ret) |
1287 | *ret = s; | |
1288 | ||
fd38203a LP |
1289 | return 0; |
1290 | } | |
1291 | ||
6e9feda3 LP |
1292 | _public_ int sd_event_add_post( |
1293 | sd_event *e, | |
1294 | sd_event_source **ret, | |
1295 | sd_event_handler_t callback, | |
1296 | void *userdata) { | |
1297 | ||
1298 | sd_event_source *s; | |
1299 | int r; | |
1300 | ||
1301 | assert_return(e, -EINVAL); | |
1302 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1303 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1304 | assert_return(!event_pid_changed(e), -ECHILD); | |
1305 | ||
d5099efc | 1306 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1307 | if (r < 0) |
1308 | return r; | |
1309 | ||
a71fe8b8 | 1310 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1311 | if (!s) |
1312 | return -ENOMEM; | |
1313 | ||
1314 | s->post.callback = callback; | |
1315 | s->userdata = userdata; | |
1316 | s->enabled = SD_EVENT_ON; | |
1317 | ||
1318 | r = set_put(e->post_sources, s); | |
1319 | if (r < 0) { | |
1320 | source_free(s); | |
1321 | return r; | |
1322 | } | |
1323 | ||
a71fe8b8 LP |
1324 | if (ret) |
1325 | *ret = s; | |
1326 | ||
6e9feda3 LP |
1327 | return 0; |
1328 | } | |
1329 | ||
6203e07a | 1330 | _public_ int sd_event_add_exit( |
305f78bf | 1331 | sd_event *e, |
151b9b96 | 1332 | sd_event_source **ret, |
718db961 | 1333 | sd_event_handler_t callback, |
151b9b96 | 1334 | void *userdata) { |
305f78bf | 1335 | |
da7e457c LP |
1336 | sd_event_source *s; |
1337 | int r; | |
1338 | ||
1339 | assert_return(e, -EINVAL); | |
1340 | assert_return(callback, -EINVAL); | |
1341 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1342 | assert_return(!event_pid_changed(e), -ECHILD); | |
1343 | ||
c983e776 EV |
1344 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1345 | if (r < 0) | |
1346 | return r; | |
da7e457c | 1347 | |
a71fe8b8 | 1348 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1349 | if (!s) |
da7e457c | 1350 | return -ENOMEM; |
fd38203a | 1351 | |
6203e07a | 1352 | s->exit.callback = callback; |
da7e457c | 1353 | s->userdata = userdata; |
6203e07a | 1354 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1355 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1356 | |
6203e07a | 1357 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1358 | if (r < 0) { |
1359 | source_free(s); | |
1360 | return r; | |
1361 | } | |
1362 | ||
a71fe8b8 LP |
1363 | if (ret) |
1364 | *ret = s; | |
1365 | ||
da7e457c LP |
1366 | return 0; |
1367 | } | |
1368 | ||
f7262a9f | 1369 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
6680dd6b LP |
1370 | |
1371 | if (!s) | |
1372 | return NULL; | |
da7e457c LP |
1373 | |
1374 | assert(s->n_ref >= 1); | |
1375 | s->n_ref++; | |
fd38203a LP |
1376 | |
1377 | return s; | |
1378 | } | |
1379 | ||
f7262a9f | 1380 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1381 | |
1382 | if (!s) | |
1383 | return NULL; | |
fd38203a | 1384 | |
da7e457c LP |
1385 | assert(s->n_ref >= 1); |
1386 | s->n_ref--; | |
1387 | ||
12179984 LP |
1388 | if (s->n_ref <= 0) { |
1389 | /* Here's a special hack: when we are called from a | |
1390 | * dispatch handler we won't free the event source | |
1391 | * immediately, but we will detach the fd from the | |
1392 | * epoll. This way it is safe for the caller to unref | |
1393 | * the event source and immediately close the fd, but | |
1394 | * we still retain a valid event source object after | |
1395 | * the callback. */ | |
1396 | ||
1397 | if (s->dispatching) { | |
1398 | if (s->type == SOURCE_IO) | |
1399 | source_io_unregister(s); | |
a71fe8b8 LP |
1400 | |
1401 | source_disconnect(s); | |
12179984 LP |
1402 | } else |
1403 | source_free(s); | |
1404 | } | |
fd38203a LP |
1405 | |
1406 | return NULL; | |
1407 | } | |
1408 | ||
356779df | 1409 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1410 | assert_return(s, -EINVAL); |
f4b2933e | 1411 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1412 | |
356779df | 1413 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1414 | } |
1415 | ||
356779df | 1416 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1417 | assert_return(s, -EINVAL); |
356779df | 1418 | assert_return(description, -EINVAL); |
f4b2933e LP |
1419 | assert_return(s->description, -ENXIO); |
1420 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
f7f53e9e | 1421 | |
356779df | 1422 | *description = s->description; |
f7f53e9e TG |
1423 | return 0; |
1424 | } | |
1425 | ||
adcc4ca3 | 1426 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1427 | assert_return(s, NULL); |
eaa3cbef LP |
1428 | |
1429 | return s->event; | |
1430 | } | |
1431 | ||
f7262a9f | 1432 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1433 | assert_return(s, -EINVAL); |
6203e07a | 1434 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1435 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1436 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1437 | |
1438 | return s->pending; | |
1439 | } | |
1440 | ||
f7262a9f | 1441 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1442 | assert_return(s, -EINVAL); |
1443 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1444 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1445 | |
1446 | return s->io.fd; | |
1447 | } | |
1448 | ||
30caf8f3 LP |
1449 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1450 | int r; | |
1451 | ||
1452 | assert_return(s, -EINVAL); | |
8ac43fee | 1453 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1454 | assert_return(s->type == SOURCE_IO, -EDOM); |
1455 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1456 | ||
1457 | if (s->io.fd == fd) | |
1458 | return 0; | |
1459 | ||
1460 | if (s->enabled == SD_EVENT_OFF) { | |
1461 | s->io.fd = fd; | |
1462 | s->io.registered = false; | |
1463 | } else { | |
1464 | int saved_fd; | |
1465 | ||
1466 | saved_fd = s->io.fd; | |
1467 | assert(s->io.registered); | |
1468 | ||
1469 | s->io.fd = fd; | |
1470 | s->io.registered = false; | |
1471 | ||
1472 | r = source_io_register(s, s->enabled, s->io.events); | |
1473 | if (r < 0) { | |
1474 | s->io.fd = saved_fd; | |
1475 | s->io.registered = true; | |
1476 | return r; | |
1477 | } | |
1478 | ||
1479 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1480 | } | |
1481 | ||
1482 | return 0; | |
1483 | } | |
1484 | ||
f7262a9f | 1485 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1486 | assert_return(s, -EINVAL); |
1487 | assert_return(events, -EINVAL); | |
1488 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1489 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1490 | |
1491 | *events = s->io.events; | |
1492 | return 0; | |
1493 | } | |
1494 | ||
f7262a9f | 1495 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1496 | int r; |
1497 | ||
305f78bf LP |
1498 | assert_return(s, -EINVAL); |
1499 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1500 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1501 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1502 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1503 | |
b63c8d4f DH |
1504 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1505 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1506 | return 0; |
1507 | ||
baf76283 | 1508 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1509 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1510 | if (r < 0) |
1511 | return r; | |
1512 | } | |
1513 | ||
1514 | s->io.events = events; | |
503f39c3 | 1515 | source_set_pending(s, false); |
fd38203a LP |
1516 | |
1517 | return 0; | |
1518 | } | |
1519 | ||
f7262a9f | 1520 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1521 | assert_return(s, -EINVAL); |
1522 | assert_return(revents, -EINVAL); | |
1523 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1524 | assert_return(s->pending, -ENODATA); | |
1525 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1526 | |
1527 | *revents = s->io.revents; | |
1528 | return 0; | |
1529 | } | |
1530 | ||
f7262a9f | 1531 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1532 | assert_return(s, -EINVAL); |
1533 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1534 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1535 | |
1536 | return s->signal.sig; | |
1537 | } | |
1538 | ||
31927c16 | 1539 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1540 | assert_return(s, -EINVAL); |
1541 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1542 | |
1543 | return s->priority; | |
1544 | } | |
1545 | ||
31927c16 | 1546 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
9da4cb2b LP |
1547 | int r; |
1548 | ||
305f78bf | 1549 | assert_return(s, -EINVAL); |
da7e457c | 1550 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1551 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1552 | |
1553 | if (s->priority == priority) | |
1554 | return 0; | |
1555 | ||
9da4cb2b LP |
1556 | if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { |
1557 | struct signal_data *old, *d; | |
1558 | ||
1559 | /* Move us from the signalfd belonging to the old | |
1560 | * priority to the signalfd of the new priority */ | |
1561 | ||
1562 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
1563 | ||
1564 | s->priority = priority; | |
1565 | ||
1566 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
1567 | if (r < 0) { | |
1568 | s->priority = old->priority; | |
1569 | return r; | |
1570 | } | |
1571 | ||
1572 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
1573 | } else | |
1574 | s->priority = priority; | |
fd38203a LP |
1575 | |
1576 | if (s->pending) | |
c2ba3ad6 | 1577 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1578 | |
1579 | if (s->prepare) | |
c2ba3ad6 | 1580 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1581 | |
6203e07a LP |
1582 | if (s->type == SOURCE_EXIT) |
1583 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1584 | |
fd38203a LP |
1585 | return 0; |
1586 | } | |
1587 | ||
f7262a9f | 1588 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1589 | assert_return(s, -EINVAL); |
1590 | assert_return(m, -EINVAL); | |
1591 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1592 | |
baf76283 | 1593 | *m = s->enabled; |
fd38203a LP |
1594 | return 0; |
1595 | } | |
1596 | ||
f7262a9f | 1597 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1598 | int r; |
1599 | ||
305f78bf LP |
1600 | assert_return(s, -EINVAL); |
1601 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
305f78bf | 1602 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1603 | |
cc567911 LP |
1604 | /* If we are dead anyway, we are fine with turning off |
1605 | * sources, but everything else needs to fail. */ | |
1606 | if (s->event->state == SD_EVENT_FINISHED) | |
1607 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1608 | ||
baf76283 | 1609 | if (s->enabled == m) |
fd38203a LP |
1610 | return 0; |
1611 | ||
baf76283 | 1612 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1613 | |
1614 | switch (s->type) { | |
1615 | ||
1616 | case SOURCE_IO: | |
366e6411 | 1617 | source_io_unregister(s); |
baf76283 | 1618 | s->enabled = m; |
fd38203a LP |
1619 | break; |
1620 | ||
6a0f1f6d | 1621 | case SOURCE_TIME_REALTIME: |
a8548816 | 1622 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1623 | case SOURCE_TIME_MONOTONIC: |
1624 | case SOURCE_TIME_REALTIME_ALARM: | |
1625 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1626 | struct clock_data *d; | |
fd38203a | 1627 | |
baf76283 | 1628 | s->enabled = m; |
6a0f1f6d LP |
1629 | d = event_get_clock_data(s->event, s->type); |
1630 | assert(d); | |
1631 | ||
1632 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1633 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1634 | d->needs_rearm = true; |
fd38203a | 1635 | break; |
6a0f1f6d | 1636 | } |
fd38203a LP |
1637 | |
1638 | case SOURCE_SIGNAL: | |
baf76283 | 1639 | s->enabled = m; |
4807d2d0 | 1640 | |
9da4cb2b | 1641 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
fd38203a LP |
1642 | break; |
1643 | ||
1644 | case SOURCE_CHILD: | |
baf76283 | 1645 | s->enabled = m; |
fd38203a | 1646 | |
baf76283 LP |
1647 | assert(s->event->n_enabled_child_sources > 0); |
1648 | s->event->n_enabled_child_sources--; | |
fd38203a | 1649 | |
9da4cb2b | 1650 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
fd38203a LP |
1651 | break; |
1652 | ||
6203e07a | 1653 | case SOURCE_EXIT: |
305f78bf | 1654 | s->enabled = m; |
6203e07a | 1655 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1656 | break; |
1657 | ||
1658 | case SOURCE_DEFER: | |
6e9feda3 | 1659 | case SOURCE_POST: |
baf76283 | 1660 | s->enabled = m; |
fd38203a | 1661 | break; |
9d3e3aa5 | 1662 | |
6a0f1f6d | 1663 | default: |
9d3e3aa5 | 1664 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1665 | } |
1666 | ||
1667 | } else { | |
1668 | switch (s->type) { | |
1669 | ||
1670 | case SOURCE_IO: | |
1671 | r = source_io_register(s, m, s->io.events); | |
1672 | if (r < 0) | |
1673 | return r; | |
1674 | ||
baf76283 | 1675 | s->enabled = m; |
fd38203a LP |
1676 | break; |
1677 | ||
6a0f1f6d | 1678 | case SOURCE_TIME_REALTIME: |
a8548816 | 1679 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1680 | case SOURCE_TIME_MONOTONIC: |
1681 | case SOURCE_TIME_REALTIME_ALARM: | |
1682 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1683 | struct clock_data *d; | |
fd38203a | 1684 | |
baf76283 | 1685 | s->enabled = m; |
6a0f1f6d LP |
1686 | d = event_get_clock_data(s->event, s->type); |
1687 | assert(d); | |
1688 | ||
1689 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1690 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1691 | d->needs_rearm = true; |
fd38203a | 1692 | break; |
6a0f1f6d | 1693 | } |
fd38203a LP |
1694 | |
1695 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1696 | |
1697 | s->enabled = m; | |
9da4cb2b LP |
1698 | |
1699 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
1700 | if (r < 0) { | |
1701 | s->enabled = SD_EVENT_OFF; | |
1702 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
1703 | return r; | |
1704 | } | |
1705 | ||
fd38203a LP |
1706 | break; |
1707 | ||
1708 | case SOURCE_CHILD: | |
4807d2d0 | 1709 | |
9da4cb2b | 1710 | if (s->enabled == SD_EVENT_OFF) |
4807d2d0 | 1711 | s->event->n_enabled_child_sources++; |
7a0d4a3d DH |
1712 | |
1713 | s->enabled = m; | |
9da4cb2b | 1714 | |
10edebf6 | 1715 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
9da4cb2b LP |
1716 | if (r < 0) { |
1717 | s->enabled = SD_EVENT_OFF; | |
1718 | s->event->n_enabled_child_sources--; | |
1719 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
1720 | return r; | |
1721 | } | |
1722 | ||
fd38203a LP |
1723 | break; |
1724 | ||
6203e07a | 1725 | case SOURCE_EXIT: |
305f78bf | 1726 | s->enabled = m; |
6203e07a | 1727 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1728 | break; |
1729 | ||
1730 | case SOURCE_DEFER: | |
6e9feda3 | 1731 | case SOURCE_POST: |
baf76283 | 1732 | s->enabled = m; |
fd38203a | 1733 | break; |
9d3e3aa5 | 1734 | |
6a0f1f6d | 1735 | default: |
9d3e3aa5 | 1736 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1737 | } |
1738 | } | |
1739 | ||
1740 | if (s->pending) | |
1741 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1742 | ||
1743 | if (s->prepare) | |
1744 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1745 | ||
1746 | return 0; | |
1747 | } | |
1748 | ||
f7262a9f | 1749 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1750 | assert_return(s, -EINVAL); |
1751 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1752 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1753 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1754 | |
1755 | *usec = s->time.next; | |
1756 | return 0; | |
1757 | } | |
1758 | ||
f7262a9f | 1759 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1760 | struct clock_data *d; |
1761 | ||
305f78bf LP |
1762 | assert_return(s, -EINVAL); |
1763 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1764 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1765 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1766 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1767 | |
fd38203a | 1768 | s->time.next = usec; |
2576a19e | 1769 | |
0cc1125a | 1770 | source_set_pending(s, false); |
fd38203a | 1771 | |
6a0f1f6d LP |
1772 | d = event_get_clock_data(s->event, s->type); |
1773 | assert(d); | |
1774 | ||
1775 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1776 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1777 | d->needs_rearm = true; |
fd38203a LP |
1778 | |
1779 | return 0; | |
1780 | } | |
1781 | ||
f7262a9f | 1782 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1783 | assert_return(s, -EINVAL); |
1784 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1785 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1786 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1787 | ||
1788 | *usec = s->time.accuracy; | |
1789 | return 0; | |
1790 | } | |
1791 | ||
f7262a9f | 1792 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1793 | struct clock_data *d; |
1794 | ||
305f78bf LP |
1795 | assert_return(s, -EINVAL); |
1796 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1797 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1798 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1799 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1800 | |
1801 | if (usec == 0) | |
1802 | usec = DEFAULT_ACCURACY_USEC; | |
1803 | ||
eaa3cbef LP |
1804 | s->time.accuracy = usec; |
1805 | ||
2576a19e LP |
1806 | source_set_pending(s, false); |
1807 | ||
6a0f1f6d LP |
1808 | d = event_get_clock_data(s->event, s->type); |
1809 | assert(d); | |
1810 | ||
1811 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1812 | d->needs_rearm = true; |
6a0f1f6d LP |
1813 | |
1814 | return 0; | |
1815 | } | |
1816 | ||
1817 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1818 | assert_return(s, -EINVAL); | |
1819 | assert_return(clock, -EINVAL); | |
1820 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1821 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1822 | |
6a0f1f6d | 1823 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1824 | return 0; |
1825 | } | |
1826 | ||
f7262a9f | 1827 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1828 | assert_return(s, -EINVAL); |
1829 | assert_return(pid, -EINVAL); | |
1830 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1831 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1832 | ||
1833 | *pid = s->child.pid; | |
1834 | return 0; | |
1835 | } | |
1836 | ||
718db961 | 1837 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1838 | int r; |
1839 | ||
da7e457c | 1840 | assert_return(s, -EINVAL); |
6203e07a | 1841 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1842 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1843 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1844 | |
1845 | if (s->prepare == callback) | |
1846 | return 0; | |
1847 | ||
1848 | if (callback && s->prepare) { | |
1849 | s->prepare = callback; | |
1850 | return 0; | |
1851 | } | |
1852 | ||
1853 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1854 | if (r < 0) | |
1855 | return r; | |
1856 | ||
1857 | s->prepare = callback; | |
1858 | ||
1859 | if (callback) { | |
1860 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1861 | if (r < 0) | |
1862 | return r; | |
1863 | } else | |
1864 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1865 | ||
1866 | return 0; | |
1867 | } | |
1868 | ||
f7262a9f | 1869 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1870 | assert_return(s, NULL); |
fd38203a LP |
1871 | |
1872 | return s->userdata; | |
1873 | } | |
1874 | ||
8f726607 LP |
1875 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1876 | void *ret; | |
1877 | ||
1878 | assert_return(s, NULL); | |
1879 | ||
1880 | ret = s->userdata; | |
1881 | s->userdata = userdata; | |
1882 | ||
1883 | return ret; | |
1884 | } | |
1885 | ||
c2ba3ad6 LP |
1886 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1887 | usec_t c; | |
1888 | assert(e); | |
1889 | assert(a <= b); | |
1890 | ||
1891 | if (a <= 0) | |
1892 | return 0; | |
1893 | ||
1894 | if (b <= a + 1) | |
1895 | return a; | |
1896 | ||
52444dc4 LP |
1897 | initialize_perturb(e); |
1898 | ||
c2ba3ad6 LP |
1899 | /* |
1900 | Find a good time to wake up again between times a and b. We | |
1901 | have two goals here: | |
1902 | ||
1903 | a) We want to wake up as seldom as possible, hence prefer | |
1904 | later times over earlier times. | |
1905 | ||
1906 | b) But if we have to wake up, then let's make sure to | |
1907 | dispatch as much as possible on the entire system. | |
1908 | ||
1909 | We implement this by waking up everywhere at the same time | |
850516e0 | 1910 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1911 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1912 | then we try to find the same spot in every 10s, then 1s and |
1913 | then 250ms step. Otherwise, we pick the last possible time | |
1914 | to wake up. | |
c2ba3ad6 LP |
1915 | */ |
1916 | ||
850516e0 LP |
1917 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1918 | if (c >= b) { | |
1919 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1920 | return b; | |
1921 | ||
1922 | c -= USEC_PER_MINUTE; | |
1923 | } | |
1924 | ||
ba276c81 LP |
1925 | if (c >= a) |
1926 | return c; | |
1927 | ||
1928 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1929 | if (c >= b) { | |
1930 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1931 | return b; | |
1932 | ||
1933 | c -= USEC_PER_SEC*10; | |
1934 | } | |
1935 | ||
850516e0 LP |
1936 | if (c >= a) |
1937 | return c; | |
1938 | ||
1939 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1940 | if (c >= b) { |
1941 | if (_unlikely_(c < USEC_PER_SEC)) | |
1942 | return b; | |
1943 | ||
1944 | c -= USEC_PER_SEC; | |
1945 | } | |
1946 | ||
1947 | if (c >= a) | |
1948 | return c; | |
1949 | ||
1950 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1951 | if (c >= b) { | |
1952 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1953 | return b; | |
1954 | ||
1955 | c -= USEC_PER_MSEC*250; | |
1956 | } | |
1957 | ||
1958 | if (c >= a) | |
1959 | return c; | |
1960 | ||
1961 | return b; | |
1962 | } | |
1963 | ||
fd38203a LP |
1964 | static int event_arm_timer( |
1965 | sd_event *e, | |
6a0f1f6d | 1966 | struct clock_data *d) { |
fd38203a LP |
1967 | |
1968 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1969 | sd_event_source *a, *b; |
1970 | usec_t t; | |
fd38203a LP |
1971 | int r; |
1972 | ||
cde93897 | 1973 | assert(e); |
6a0f1f6d | 1974 | assert(d); |
fd38203a | 1975 | |
d06441da | 1976 | if (!d->needs_rearm) |
212bbb17 TG |
1977 | return 0; |
1978 | else | |
1979 | d->needs_rearm = false; | |
1980 | ||
6a0f1f6d | 1981 | a = prioq_peek(d->earliest); |
72aedc1e LP |
1982 | if (!a || a->enabled == SD_EVENT_OFF) { |
1983 | ||
6a0f1f6d | 1984 | if (d->fd < 0) |
c57b5ca3 LP |
1985 | return 0; |
1986 | ||
3a43da28 | 1987 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
1988 | return 0; |
1989 | ||
1990 | /* disarm */ | |
6a0f1f6d | 1991 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1992 | if (r < 0) |
1993 | return r; | |
1994 | ||
3a43da28 | 1995 | d->next = USEC_INFINITY; |
fd38203a | 1996 | return 0; |
72aedc1e | 1997 | } |
fd38203a | 1998 | |
6a0f1f6d | 1999 | b = prioq_peek(d->latest); |
baf76283 | 2000 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 | 2001 | |
1bce0ffa | 2002 | t = sleep_between(e, a->time.next, time_event_source_latest(b)); |
6a0f1f6d | 2003 | if (d->next == t) |
fd38203a LP |
2004 | return 0; |
2005 | ||
6a0f1f6d | 2006 | assert_se(d->fd >= 0); |
fd38203a | 2007 | |
c2ba3ad6 | 2008 | if (t == 0) { |
fd38203a LP |
2009 | /* We don' want to disarm here, just mean some time looooong ago. */ |
2010 | its.it_value.tv_sec = 0; | |
2011 | its.it_value.tv_nsec = 1; | |
2012 | } else | |
c2ba3ad6 | 2013 | timespec_store(&its.it_value, t); |
fd38203a | 2014 | |
6a0f1f6d | 2015 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 2016 | if (r < 0) |
cde93897 | 2017 | return -errno; |
fd38203a | 2018 | |
6a0f1f6d | 2019 | d->next = t; |
fd38203a LP |
2020 | return 0; |
2021 | } | |
2022 | ||
9a800b56 | 2023 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
2024 | assert(e); |
2025 | assert(s); | |
2026 | assert(s->type == SOURCE_IO); | |
2027 | ||
9a800b56 LP |
2028 | /* If the event source was already pending, we just OR in the |
2029 | * new revents, otherwise we reset the value. The ORing is | |
2030 | * necessary to handle EPOLLONESHOT events properly where | |
2031 | * readability might happen independently of writability, and | |
2032 | * we need to keep track of both */ | |
2033 | ||
2034 | if (s->pending) | |
2035 | s->io.revents |= revents; | |
2036 | else | |
2037 | s->io.revents = revents; | |
fd38203a | 2038 | |
fd38203a LP |
2039 | return source_set_pending(s, true); |
2040 | } | |
2041 | ||
72aedc1e | 2042 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2043 | uint64_t x; |
2044 | ssize_t ss; | |
2045 | ||
2046 | assert(e); | |
da7e457c | 2047 | assert(fd >= 0); |
72aedc1e | 2048 | |
305f78bf | 2049 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2050 | |
2051 | ss = read(fd, &x, sizeof(x)); | |
2052 | if (ss < 0) { | |
2053 | if (errno == EAGAIN || errno == EINTR) | |
2054 | return 0; | |
2055 | ||
2056 | return -errno; | |
2057 | } | |
2058 | ||
8d35dae7 | 2059 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2060 | return -EIO; |
2061 | ||
cde93897 | 2062 | if (next) |
3a43da28 | 2063 | *next = USEC_INFINITY; |
72aedc1e | 2064 | |
fd38203a LP |
2065 | return 0; |
2066 | } | |
2067 | ||
305f78bf LP |
2068 | static int process_timer( |
2069 | sd_event *e, | |
2070 | usec_t n, | |
6a0f1f6d | 2071 | struct clock_data *d) { |
305f78bf | 2072 | |
fd38203a LP |
2073 | sd_event_source *s; |
2074 | int r; | |
2075 | ||
2076 | assert(e); | |
6a0f1f6d | 2077 | assert(d); |
fd38203a LP |
2078 | |
2079 | for (;;) { | |
6a0f1f6d | 2080 | s = prioq_peek(d->earliest); |
fd38203a LP |
2081 | if (!s || |
2082 | s->time.next > n || | |
baf76283 | 2083 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2084 | s->pending) |
2085 | break; | |
2086 | ||
2087 | r = source_set_pending(s, true); | |
2088 | if (r < 0) | |
2089 | return r; | |
2090 | ||
6a0f1f6d LP |
2091 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2092 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 2093 | d->needs_rearm = true; |
fd38203a LP |
2094 | } |
2095 | ||
2096 | return 0; | |
2097 | } | |
2098 | ||
2099 | static int process_child(sd_event *e) { | |
2100 | sd_event_source *s; | |
2101 | Iterator i; | |
2102 | int r; | |
2103 | ||
2104 | assert(e); | |
2105 | ||
c2ba3ad6 LP |
2106 | e->need_process_child = false; |
2107 | ||
fd38203a LP |
2108 | /* |
2109 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2110 | + WNOHANG for each PID we wait for, instead of using | |
2111 | P_ALL. This is because we only want to get child | |
2112 | information of very specific child processes, and not all | |
2113 | of them. We might not have processed the SIGCHLD even of a | |
2114 | previous invocation and we don't want to maintain a | |
2115 | unbounded *per-child* event queue, hence we really don't | |
2116 | want anything flushed out of the kernel's queue that we | |
2117 | don't care about. Since this is O(n) this means that if you | |
2118 | have a lot of processes you probably want to handle SIGCHLD | |
2119 | yourself. | |
08cd1552 LP |
2120 | |
2121 | We do not reap the children here (by using WNOWAIT), this | |
2122 | is only done after the event source is dispatched so that | |
2123 | the callback still sees the process as a zombie. | |
fd38203a LP |
2124 | */ |
2125 | ||
2126 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2127 | assert(s->type == SOURCE_CHILD); | |
2128 | ||
2129 | if (s->pending) | |
2130 | continue; | |
2131 | ||
baf76283 | 2132 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2133 | continue; |
2134 | ||
2135 | zero(s->child.siginfo); | |
08cd1552 LP |
2136 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2137 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
2138 | if (r < 0) |
2139 | return -errno; | |
2140 | ||
2141 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
2142 | bool zombie = |
2143 | s->child.siginfo.si_code == CLD_EXITED || | |
2144 | s->child.siginfo.si_code == CLD_KILLED || | |
2145 | s->child.siginfo.si_code == CLD_DUMPED; | |
2146 | ||
2147 | if (!zombie && (s->child.options & WEXITED)) { | |
2148 | /* If the child isn't dead then let's | |
2149 | * immediately remove the state change | |
2150 | * from the queue, since there's no | |
2151 | * benefit in leaving it queued */ | |
2152 | ||
2153 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2154 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2155 | } | |
2156 | ||
fd38203a LP |
2157 | r = source_set_pending(s, true); |
2158 | if (r < 0) | |
2159 | return r; | |
2160 | } | |
2161 | } | |
2162 | ||
fd38203a LP |
2163 | return 0; |
2164 | } | |
2165 | ||
9da4cb2b | 2166 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2167 | bool read_one = false; |
fd38203a LP |
2168 | int r; |
2169 | ||
da7e457c | 2170 | assert(e); |
305f78bf | 2171 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2172 | |
9da4cb2b LP |
2173 | /* If there's a signal queued on this priority and SIGCHLD is |
2174 | on this priority too, then make sure to recheck the | |
2175 | children we watch. This is because we only ever dequeue | |
2176 | the first signal per priority, and if we dequeue one, and | |
2177 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2178 | might have higher priority children we care about hence we | |
2179 | need to check that explicitly. */ | |
2180 | ||
2181 | if (sigismember(&d->sigset, SIGCHLD)) | |
2182 | e->need_process_child = true; | |
2183 | ||
2184 | /* If there's already an event source pending for this | |
2185 | * priority we don't read another */ | |
2186 | if (d->current) | |
2187 | return 0; | |
2188 | ||
fd38203a | 2189 | for (;;) { |
0eb2e0e3 | 2190 | struct signalfd_siginfo si; |
7057bd99 | 2191 | ssize_t n; |
92daebc0 | 2192 | sd_event_source *s = NULL; |
fd38203a | 2193 | |
9da4cb2b | 2194 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 2195 | if (n < 0) { |
fd38203a LP |
2196 | if (errno == EAGAIN || errno == EINTR) |
2197 | return read_one; | |
2198 | ||
2199 | return -errno; | |
2200 | } | |
2201 | ||
7057bd99 | 2202 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2203 | return -EIO; |
2204 | ||
7057bd99 ZJS |
2205 | assert(si.ssi_signo < _NSIG); |
2206 | ||
fd38203a LP |
2207 | read_one = true; |
2208 | ||
92daebc0 LP |
2209 | if (e->signal_sources) |
2210 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
2211 | if (!s) |
2212 | continue; | |
9da4cb2b LP |
2213 | if (s->pending) |
2214 | continue; | |
fd38203a LP |
2215 | |
2216 | s->signal.siginfo = si; | |
9da4cb2b LP |
2217 | d->current = s; |
2218 | ||
fd38203a LP |
2219 | r = source_set_pending(s, true); |
2220 | if (r < 0) | |
2221 | return r; | |
9da4cb2b LP |
2222 | |
2223 | return 1; | |
fd38203a | 2224 | } |
fd38203a LP |
2225 | } |
2226 | ||
2227 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 2228 | int r = 0; |
fd38203a LP |
2229 | |
2230 | assert(s); | |
6203e07a | 2231 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2232 | |
6203e07a | 2233 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
2234 | r = source_set_pending(s, false); |
2235 | if (r < 0) | |
2236 | return r; | |
2237 | } | |
fd38203a | 2238 | |
6e9feda3 LP |
2239 | if (s->type != SOURCE_POST) { |
2240 | sd_event_source *z; | |
2241 | Iterator i; | |
2242 | ||
2243 | /* If we execute a non-post source, let's mark all | |
2244 | * post sources as pending */ | |
2245 | ||
2246 | SET_FOREACH(z, s->event->post_sources, i) { | |
2247 | if (z->enabled == SD_EVENT_OFF) | |
2248 | continue; | |
2249 | ||
2250 | r = source_set_pending(z, true); | |
2251 | if (r < 0) | |
2252 | return r; | |
2253 | } | |
2254 | } | |
2255 | ||
baf76283 LP |
2256 | if (s->enabled == SD_EVENT_ONESHOT) { |
2257 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2258 | if (r < 0) |
2259 | return r; | |
2260 | } | |
2261 | ||
12179984 | 2262 | s->dispatching = true; |
b7484e2a | 2263 | |
fd38203a LP |
2264 | switch (s->type) { |
2265 | ||
2266 | case SOURCE_IO: | |
2267 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2268 | break; | |
2269 | ||
6a0f1f6d | 2270 | case SOURCE_TIME_REALTIME: |
a8548816 | 2271 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2272 | case SOURCE_TIME_MONOTONIC: |
2273 | case SOURCE_TIME_REALTIME_ALARM: | |
2274 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2275 | r = s->time.callback(s, s->time.next, s->userdata); |
2276 | break; | |
2277 | ||
2278 | case SOURCE_SIGNAL: | |
2279 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2280 | break; | |
2281 | ||
08cd1552 LP |
2282 | case SOURCE_CHILD: { |
2283 | bool zombie; | |
2284 | ||
2285 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
2286 | s->child.siginfo.si_code == CLD_KILLED || | |
2287 | s->child.siginfo.si_code == CLD_DUMPED; | |
2288 | ||
fd38203a | 2289 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2290 | |
2291 | /* Now, reap the PID for good. */ | |
2292 | if (zombie) | |
2293 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2294 | ||
fd38203a | 2295 | break; |
08cd1552 | 2296 | } |
fd38203a LP |
2297 | |
2298 | case SOURCE_DEFER: | |
2299 | r = s->defer.callback(s, s->userdata); | |
2300 | break; | |
da7e457c | 2301 | |
6e9feda3 LP |
2302 | case SOURCE_POST: |
2303 | r = s->post.callback(s, s->userdata); | |
2304 | break; | |
2305 | ||
6203e07a LP |
2306 | case SOURCE_EXIT: |
2307 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2308 | break; |
9d3e3aa5 LP |
2309 | |
2310 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2311 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2312 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2313 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2314 | } |
2315 | ||
12179984 LP |
2316 | s->dispatching = false; |
2317 | ||
55cbfaa5 DM |
2318 | if (r < 0) |
2319 | log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m", | |
2320 | strna(s->description), event_source_type_to_string(s->type)); | |
12179984 LP |
2321 | |
2322 | if (s->n_ref == 0) | |
2323 | source_free(s); | |
2324 | else if (r < 0) | |
6203e07a | 2325 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2326 | |
6203e07a | 2327 | return 1; |
fd38203a LP |
2328 | } |
2329 | ||
2330 | static int event_prepare(sd_event *e) { | |
2331 | int r; | |
2332 | ||
2333 | assert(e); | |
2334 | ||
2335 | for (;;) { | |
2336 | sd_event_source *s; | |
2337 | ||
2338 | s = prioq_peek(e->prepare); | |
baf76283 | 2339 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2340 | break; |
2341 | ||
2342 | s->prepare_iteration = e->iteration; | |
2343 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2344 | if (r < 0) | |
2345 | return r; | |
2346 | ||
2347 | assert(s->prepare); | |
12179984 LP |
2348 | |
2349 | s->dispatching = true; | |
fd38203a | 2350 | r = s->prepare(s, s->userdata); |
12179984 LP |
2351 | s->dispatching = false; |
2352 | ||
55cbfaa5 DM |
2353 | if (r < 0) |
2354 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m", | |
2355 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a | 2356 | |
12179984 LP |
2357 | if (s->n_ref == 0) |
2358 | source_free(s); | |
2359 | else if (r < 0) | |
2360 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2361 | } |
2362 | ||
2363 | return 0; | |
2364 | } | |
2365 | ||
6203e07a | 2366 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2367 | sd_event_source *p; |
2368 | int r; | |
2369 | ||
2370 | assert(e); | |
2371 | ||
6203e07a | 2372 | p = prioq_peek(e->exit); |
baf76283 | 2373 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2374 | e->state = SD_EVENT_FINISHED; |
2375 | return 0; | |
2376 | } | |
2377 | ||
2378 | sd_event_ref(e); | |
2379 | e->iteration++; | |
6203e07a | 2380 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2381 | |
2382 | r = source_dispatch(p); | |
2383 | ||
2b0c9ef7 | 2384 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2385 | sd_event_unref(e); |
2386 | ||
2387 | return r; | |
2388 | } | |
2389 | ||
c2ba3ad6 LP |
2390 | static sd_event_source* event_next_pending(sd_event *e) { |
2391 | sd_event_source *p; | |
2392 | ||
da7e457c LP |
2393 | assert(e); |
2394 | ||
c2ba3ad6 LP |
2395 | p = prioq_peek(e->pending); |
2396 | if (!p) | |
2397 | return NULL; | |
2398 | ||
baf76283 | 2399 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2400 | return NULL; |
2401 | ||
2402 | return p; | |
2403 | } | |
2404 | ||
cde93897 LP |
2405 | static int arm_watchdog(sd_event *e) { |
2406 | struct itimerspec its = {}; | |
2407 | usec_t t; | |
2408 | int r; | |
2409 | ||
2410 | assert(e); | |
2411 | assert(e->watchdog_fd >= 0); | |
2412 | ||
2413 | t = sleep_between(e, | |
2414 | e->watchdog_last + (e->watchdog_period / 2), | |
2415 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2416 | ||
2417 | timespec_store(&its.it_value, t); | |
2418 | ||
75145780 LP |
2419 | /* Make sure we never set the watchdog to 0, which tells the |
2420 | * kernel to disable it. */ | |
2421 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2422 | its.it_value.tv_nsec = 1; | |
2423 | ||
cde93897 LP |
2424 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2425 | if (r < 0) | |
2426 | return -errno; | |
2427 | ||
2428 | return 0; | |
2429 | } | |
2430 | ||
2431 | static int process_watchdog(sd_event *e) { | |
2432 | assert(e); | |
2433 | ||
2434 | if (!e->watchdog) | |
2435 | return 0; | |
2436 | ||
2437 | /* Don't notify watchdog too often */ | |
2438 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2439 | return 0; | |
2440 | ||
2441 | sd_notify(false, "WATCHDOG=1"); | |
2442 | e->watchdog_last = e->timestamp.monotonic; | |
2443 | ||
2444 | return arm_watchdog(e); | |
2445 | } | |
2446 | ||
c45a5a74 TG |
2447 | _public_ int sd_event_prepare(sd_event *e) { |
2448 | int r; | |
fd38203a | 2449 | |
da7e457c LP |
2450 | assert_return(e, -EINVAL); |
2451 | assert_return(!event_pid_changed(e), -ECHILD); | |
2452 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2453 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 2454 | |
6203e07a | 2455 | if (e->exit_requested) |
c45a5a74 | 2456 | goto pending; |
fd38203a LP |
2457 | |
2458 | e->iteration++; | |
2459 | ||
0be6c2f6 | 2460 | e->state = SD_EVENT_PREPARING; |
fd38203a | 2461 | r = event_prepare(e); |
0be6c2f6 | 2462 | e->state = SD_EVENT_INITIAL; |
fd38203a | 2463 | if (r < 0) |
c45a5a74 | 2464 | return r; |
fd38203a | 2465 | |
6a0f1f6d LP |
2466 | r = event_arm_timer(e, &e->realtime); |
2467 | if (r < 0) | |
c45a5a74 | 2468 | return r; |
6a0f1f6d | 2469 | |
a8548816 TG |
2470 | r = event_arm_timer(e, &e->boottime); |
2471 | if (r < 0) | |
c45a5a74 | 2472 | return r; |
a8548816 | 2473 | |
6a0f1f6d LP |
2474 | r = event_arm_timer(e, &e->monotonic); |
2475 | if (r < 0) | |
c45a5a74 | 2476 | return r; |
6a0f1f6d LP |
2477 | |
2478 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 2479 | if (r < 0) |
c45a5a74 | 2480 | return r; |
fd38203a | 2481 | |
6a0f1f6d | 2482 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 2483 | if (r < 0) |
c45a5a74 | 2484 | return r; |
fd38203a | 2485 | |
1b5995b0 | 2486 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
2487 | goto pending; |
2488 | ||
2b0c9ef7 | 2489 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
2490 | |
2491 | return 0; | |
2492 | ||
2493 | pending: | |
2b0c9ef7 | 2494 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2495 | r = sd_event_wait(e, 0); |
2496 | if (r == 0) | |
2b0c9ef7 | 2497 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2498 | |
2499 | return r; | |
c45a5a74 TG |
2500 | } |
2501 | ||
2502 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2503 | struct epoll_event *ev_queue; | |
2504 | unsigned ev_queue_max; | |
2505 | int r, m, i; | |
2506 | ||
2507 | assert_return(e, -EINVAL); | |
2508 | assert_return(!event_pid_changed(e), -ECHILD); | |
2509 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2510 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
2511 | |
2512 | if (e->exit_requested) { | |
2513 | e->state = SD_EVENT_PENDING; | |
2514 | return 1; | |
2515 | } | |
6a0f1f6d | 2516 | |
1c724e9e | 2517 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 2518 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 2519 | |
15b38f93 | 2520 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2521 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2522 | if (m < 0) { |
c45a5a74 TG |
2523 | if (errno == EINTR) { |
2524 | e->state = SD_EVENT_PENDING; | |
2525 | return 1; | |
2526 | } | |
2527 | ||
2528 | r = -errno; | |
da7e457c LP |
2529 | goto finish; |
2530 | } | |
fd38203a | 2531 | |
46e8c825 | 2532 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2533 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2534 | |
2535 | for (i = 0; i < m; i++) { | |
2536 | ||
9da4cb2b | 2537 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2538 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
9da4cb2b LP |
2539 | else { |
2540 | WakeupType *t = ev_queue[i].data.ptr; | |
2541 | ||
2542 | switch (*t) { | |
2543 | ||
2544 | case WAKEUP_EVENT_SOURCE: | |
2545 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2546 | break; | |
fd38203a | 2547 | |
9da4cb2b LP |
2548 | case WAKEUP_CLOCK_DATA: { |
2549 | struct clock_data *d = ev_queue[i].data.ptr; | |
2550 | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); | |
2551 | break; | |
2552 | } | |
2553 | ||
2554 | case WAKEUP_SIGNAL_DATA: | |
2555 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2556 | break; | |
2557 | ||
2558 | default: | |
2559 | assert_not_reached("Invalid wake-up pointer"); | |
2560 | } | |
2561 | } | |
fd38203a | 2562 | if (r < 0) |
da7e457c | 2563 | goto finish; |
fd38203a LP |
2564 | } |
2565 | ||
cde93897 LP |
2566 | r = process_watchdog(e); |
2567 | if (r < 0) | |
2568 | goto finish; | |
2569 | ||
6a0f1f6d LP |
2570 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2571 | if (r < 0) | |
2572 | goto finish; | |
2573 | ||
a8548816 TG |
2574 | r = process_timer(e, e->timestamp_boottime, &e->boottime); |
2575 | if (r < 0) | |
2576 | goto finish; | |
2577 | ||
6a0f1f6d LP |
2578 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2579 | if (r < 0) | |
2580 | goto finish; | |
2581 | ||
2582 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2583 | if (r < 0) |
da7e457c | 2584 | goto finish; |
fd38203a | 2585 | |
6a0f1f6d | 2586 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2587 | if (r < 0) |
da7e457c | 2588 | goto finish; |
fd38203a | 2589 | |
c2ba3ad6 | 2590 | if (e->need_process_child) { |
fd38203a LP |
2591 | r = process_child(e); |
2592 | if (r < 0) | |
da7e457c | 2593 | goto finish; |
fd38203a LP |
2594 | } |
2595 | ||
c45a5a74 TG |
2596 | if (event_next_pending(e)) { |
2597 | e->state = SD_EVENT_PENDING; | |
2598 | ||
2599 | return 1; | |
da7e457c LP |
2600 | } |
2601 | ||
c45a5a74 | 2602 | r = 0; |
fd38203a | 2603 | |
da7e457c | 2604 | finish: |
2b0c9ef7 | 2605 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2606 | |
2607 | return r; | |
fd38203a LP |
2608 | } |
2609 | ||
c45a5a74 TG |
2610 | _public_ int sd_event_dispatch(sd_event *e) { |
2611 | sd_event_source *p; | |
2612 | int r; | |
2613 | ||
2614 | assert_return(e, -EINVAL); | |
2615 | assert_return(!event_pid_changed(e), -ECHILD); | |
2616 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2617 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
2618 | ||
2619 | if (e->exit_requested) | |
2620 | return dispatch_exit(e); | |
2621 | ||
2622 | p = event_next_pending(e); | |
2623 | if (p) { | |
2624 | sd_event_ref(e); | |
2625 | ||
2626 | e->state = SD_EVENT_RUNNING; | |
2627 | r = source_dispatch(p); | |
2b0c9ef7 | 2628 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2629 | |
2630 | sd_event_unref(e); | |
2631 | ||
2632 | return r; | |
2633 | } | |
2634 | ||
2b0c9ef7 | 2635 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2636 | |
2637 | return 1; | |
2638 | } | |
2639 | ||
34b87517 VC |
2640 | static void event_log_delays(sd_event *e) { |
2641 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1]; | |
34a6843d VC |
2642 | unsigned i; |
2643 | int o; | |
34b87517 VC |
2644 | |
2645 | for (i = o = 0; i < ELEMENTSOF(e->delays); i++) { | |
2646 | o += snprintf(&b[o], sizeof(b) - o, "%u ", e->delays[i]); | |
2647 | e->delays[i] = 0; | |
2648 | } | |
34a6843d | 2649 | log_debug("Event loop iterations: %.*s", o, b); |
34b87517 VC |
2650 | } |
2651 | ||
c45a5a74 TG |
2652 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
2653 | int r; | |
2654 | ||
2655 | assert_return(e, -EINVAL); | |
2656 | assert_return(!event_pid_changed(e), -ECHILD); | |
2657 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2658 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 | 2659 | |
34b87517 VC |
2660 | if (e->profile_delays && e->last_run) { |
2661 | usec_t this_run; | |
2662 | unsigned l; | |
2663 | ||
2664 | this_run = now(CLOCK_MONOTONIC); | |
2665 | ||
2666 | l = u64log2(this_run - e->last_run); | |
2667 | assert(l < sizeof(e->delays)); | |
2668 | e->delays[l]++; | |
2669 | ||
2670 | if (this_run - e->last_log >= 5*USEC_PER_SEC) { | |
2671 | event_log_delays(e); | |
2672 | e->last_log = this_run; | |
2673 | } | |
2674 | } | |
2675 | ||
c45a5a74 | 2676 | r = sd_event_prepare(e); |
53bac4e0 LP |
2677 | if (r == 0) |
2678 | /* There was nothing? Then wait... */ | |
2679 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 2680 | |
34b87517 VC |
2681 | if (e->profile_delays) |
2682 | e->last_run = now(CLOCK_MONOTONIC); | |
2683 | ||
02d30981 | 2684 | if (r > 0) { |
53bac4e0 | 2685 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
2686 | r = sd_event_dispatch(e); |
2687 | if (r < 0) | |
2688 | return r; | |
53bac4e0 LP |
2689 | |
2690 | return 1; | |
2691 | } | |
2692 | ||
2693 | return r; | |
c45a5a74 TG |
2694 | } |
2695 | ||
f7262a9f | 2696 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2697 | int r; |
2698 | ||
da7e457c LP |
2699 | assert_return(e, -EINVAL); |
2700 | assert_return(!event_pid_changed(e), -ECHILD); | |
2b0c9ef7 | 2701 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c LP |
2702 | |
2703 | sd_event_ref(e); | |
fd38203a | 2704 | |
da7e457c | 2705 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2706 | r = sd_event_run(e, (uint64_t) -1); |
2707 | if (r < 0) | |
da7e457c | 2708 | goto finish; |
fd38203a LP |
2709 | } |
2710 | ||
6203e07a | 2711 | r = e->exit_code; |
da7e457c LP |
2712 | |
2713 | finish: | |
2714 | sd_event_unref(e); | |
2715 | return r; | |
fd38203a LP |
2716 | } |
2717 | ||
9b364545 TG |
2718 | _public_ int sd_event_get_fd(sd_event *e) { |
2719 | ||
2720 | assert_return(e, -EINVAL); | |
2721 | assert_return(!event_pid_changed(e), -ECHILD); | |
2722 | ||
2723 | return e->epoll_fd; | |
2724 | } | |
2725 | ||
f7262a9f | 2726 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2727 | assert_return(e, -EINVAL); |
2728 | assert_return(!event_pid_changed(e), -ECHILD); | |
2729 | ||
2730 | return e->state; | |
2731 | } | |
2732 | ||
6203e07a | 2733 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2734 | assert_return(e, -EINVAL); |
6203e07a | 2735 | assert_return(code, -EINVAL); |
da7e457c | 2736 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2737 | |
6203e07a LP |
2738 | if (!e->exit_requested) |
2739 | return -ENODATA; | |
2740 | ||
2741 | *code = e->exit_code; | |
2742 | return 0; | |
fd38203a LP |
2743 | } |
2744 | ||
6203e07a | 2745 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2746 | assert_return(e, -EINVAL); |
2747 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2748 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2749 | |
6203e07a LP |
2750 | e->exit_requested = true; |
2751 | e->exit_code = code; | |
2752 | ||
fd38203a LP |
2753 | return 0; |
2754 | } | |
46e8c825 | 2755 | |
6a0f1f6d | 2756 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2757 | assert_return(e, -EINVAL); |
2758 | assert_return(usec, -EINVAL); | |
46e8c825 | 2759 | assert_return(!event_pid_changed(e), -ECHILD); |
2c86ba5a ZJS |
2760 | assert_return(IN_SET(clock, |
2761 | CLOCK_REALTIME, | |
2762 | CLOCK_REALTIME_ALARM, | |
2763 | CLOCK_MONOTONIC, | |
2764 | CLOCK_BOOTTIME, | |
2765 | CLOCK_BOOTTIME_ALARM), -EOPNOTSUPP); | |
46e8c825 | 2766 | |
38a03f06 LP |
2767 | if (!dual_timestamp_is_set(&e->timestamp)) { |
2768 | /* Implicitly fall back to now() if we never ran | |
2769 | * before and thus have no cached time. */ | |
2770 | *usec = now(clock); | |
2771 | return 1; | |
2772 | } | |
46e8c825 | 2773 | |
6a0f1f6d LP |
2774 | switch (clock) { |
2775 | ||
2776 | case CLOCK_REALTIME: | |
2777 | case CLOCK_REALTIME_ALARM: | |
2778 | *usec = e->timestamp.realtime; | |
2779 | break; | |
2780 | ||
2781 | case CLOCK_MONOTONIC: | |
2782 | *usec = e->timestamp.monotonic; | |
2783 | break; | |
2784 | ||
2c86ba5a | 2785 | default: |
6a0f1f6d LP |
2786 | *usec = e->timestamp_boottime; |
2787 | break; | |
2788 | } | |
46e8c825 | 2789 | |
46e8c825 LP |
2790 | return 0; |
2791 | } | |
afc6adb5 LP |
2792 | |
2793 | _public_ int sd_event_default(sd_event **ret) { | |
2794 | ||
ec202eae | 2795 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2796 | sd_event *e = NULL; |
afc6adb5 LP |
2797 | int r; |
2798 | ||
2799 | if (!ret) | |
2800 | return !!default_event; | |
2801 | ||
2802 | if (default_event) { | |
2803 | *ret = sd_event_ref(default_event); | |
2804 | return 0; | |
2805 | } | |
2806 | ||
2807 | r = sd_event_new(&e); | |
2808 | if (r < 0) | |
2809 | return r; | |
2810 | ||
2811 | e->default_event_ptr = &default_event; | |
2812 | e->tid = gettid(); | |
2813 | default_event = e; | |
2814 | ||
2815 | *ret = e; | |
2816 | return 1; | |
2817 | } | |
2818 | ||
2819 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2820 | assert_return(e, -EINVAL); | |
2821 | assert_return(tid, -EINVAL); | |
76b54375 | 2822 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2823 | |
76b54375 LP |
2824 | if (e->tid != 0) { |
2825 | *tid = e->tid; | |
2826 | return 0; | |
2827 | } | |
2828 | ||
2829 | return -ENXIO; | |
afc6adb5 | 2830 | } |
cde93897 LP |
2831 | |
2832 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2833 | int r; | |
2834 | ||
2835 | assert_return(e, -EINVAL); | |
8f726607 | 2836 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2837 | |
2838 | if (e->watchdog == !!b) | |
2839 | return e->watchdog; | |
2840 | ||
2841 | if (b) { | |
2842 | struct epoll_event ev = {}; | |
cde93897 | 2843 | |
09812eb7 LP |
2844 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2845 | if (r <= 0) | |
cde93897 | 2846 | return r; |
cde93897 LP |
2847 | |
2848 | /* Issue first ping immediately */ | |
2849 | sd_notify(false, "WATCHDOG=1"); | |
2850 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2851 | ||
2852 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2853 | if (e->watchdog_fd < 0) | |
2854 | return -errno; | |
2855 | ||
2856 | r = arm_watchdog(e); | |
2857 | if (r < 0) | |
2858 | goto fail; | |
2859 | ||
2860 | ev.events = EPOLLIN; | |
2861 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2862 | ||
2863 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2864 | if (r < 0) { | |
2865 | r = -errno; | |
2866 | goto fail; | |
2867 | } | |
2868 | ||
2869 | } else { | |
2870 | if (e->watchdog_fd >= 0) { | |
2871 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2872 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2873 | } |
2874 | } | |
2875 | ||
2876 | e->watchdog = !!b; | |
2877 | return e->watchdog; | |
2878 | ||
2879 | fail: | |
03e334a1 | 2880 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2881 | return r; |
2882 | } | |
8f726607 LP |
2883 | |
2884 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2885 | assert_return(e, -EINVAL); | |
2886 | assert_return(!event_pid_changed(e), -ECHILD); | |
2887 | ||
2888 | return e->watchdog; | |
2889 | } |