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Commit | Line | Data |
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fd38203a LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2013 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <sys/epoll.h> | |
21 | #include <sys/timerfd.h> | |
22 | #include <sys/wait.h> | |
23 | ||
cde93897 | 24 | #include "sd-daemon.h" |
07630cea LP |
25 | #include "sd-event.h" |
26 | #include "sd-id128.h" | |
27 | ||
b5efdb8a | 28 | #include "alloc-util.h" |
3ffd4af2 | 29 | #include "fd-util.h" |
fd38203a | 30 | #include "hashmap.h" |
07630cea LP |
31 | #include "list.h" |
32 | #include "macro.h" | |
afc6adb5 | 33 | #include "missing.h" |
07630cea | 34 | #include "prioq.h" |
4a0b58c4 | 35 | #include "process-util.h" |
6e9feda3 | 36 | #include "set.h" |
24882e06 | 37 | #include "signal-util.h" |
55cbfaa5 | 38 | #include "string-table.h" |
07630cea LP |
39 | #include "string-util.h" |
40 | #include "time-util.h" | |
41 | #include "util.h" | |
fd38203a | 42 | |
c2ba3ad6 | 43 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
44 | |
45 | typedef enum EventSourceType { | |
46 | SOURCE_IO, | |
6a0f1f6d | 47 | SOURCE_TIME_REALTIME, |
a8548816 | 48 | SOURCE_TIME_BOOTTIME, |
6a0f1f6d LP |
49 | SOURCE_TIME_MONOTONIC, |
50 | SOURCE_TIME_REALTIME_ALARM, | |
51 | SOURCE_TIME_BOOTTIME_ALARM, | |
fd38203a LP |
52 | SOURCE_SIGNAL, |
53 | SOURCE_CHILD, | |
da7e457c | 54 | SOURCE_DEFER, |
6e9feda3 | 55 | SOURCE_POST, |
6203e07a | 56 | SOURCE_EXIT, |
6a0f1f6d | 57 | SOURCE_WATCHDOG, |
a71fe8b8 | 58 | _SOURCE_EVENT_SOURCE_TYPE_MAX, |
6a0f1f6d | 59 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 |
fd38203a LP |
60 | } EventSourceType; |
61 | ||
55cbfaa5 DM |
62 | static const char* const event_source_type_table[_SOURCE_EVENT_SOURCE_TYPE_MAX] = { |
63 | [SOURCE_IO] = "io", | |
64 | [SOURCE_TIME_REALTIME] = "realtime", | |
65 | [SOURCE_TIME_BOOTTIME] = "bootime", | |
66 | [SOURCE_TIME_MONOTONIC] = "monotonic", | |
67 | [SOURCE_TIME_REALTIME_ALARM] = "realtime-alarm", | |
68 | [SOURCE_TIME_BOOTTIME_ALARM] = "boottime-alarm", | |
69 | [SOURCE_SIGNAL] = "signal", | |
70 | [SOURCE_CHILD] = "child", | |
71 | [SOURCE_DEFER] = "defer", | |
72 | [SOURCE_POST] = "post", | |
73 | [SOURCE_EXIT] = "exit", | |
74 | [SOURCE_WATCHDOG] = "watchdog", | |
75 | }; | |
76 | ||
77 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(event_source_type, int); | |
78 | ||
9da4cb2b LP |
79 | /* All objects we use in epoll events start with this value, so that |
80 | * we know how to dispatch it */ | |
81 | typedef enum WakeupType { | |
82 | WAKEUP_NONE, | |
83 | WAKEUP_EVENT_SOURCE, | |
84 | WAKEUP_CLOCK_DATA, | |
85 | WAKEUP_SIGNAL_DATA, | |
86 | _WAKEUP_TYPE_MAX, | |
87 | _WAKEUP_TYPE_INVALID = -1, | |
88 | } WakeupType; | |
89 | ||
a8548816 | 90 | #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 | 91 | |
fd38203a | 92 | struct sd_event_source { |
9da4cb2b LP |
93 | WakeupType wakeup; |
94 | ||
da7e457c | 95 | unsigned n_ref; |
fd38203a LP |
96 | |
97 | sd_event *event; | |
98 | void *userdata; | |
718db961 | 99 | sd_event_handler_t prepare; |
fd38203a | 100 | |
356779df | 101 | char *description; |
f7f53e9e | 102 | |
6a0f1f6d | 103 | EventSourceType type:5; |
baf76283 | 104 | int enabled:3; |
fd38203a | 105 | bool pending:1; |
12179984 | 106 | bool dispatching:1; |
a71fe8b8 | 107 | bool floating:1; |
fd38203a | 108 | |
31927c16 | 109 | int64_t priority; |
fd38203a LP |
110 | unsigned pending_index; |
111 | unsigned prepare_index; | |
112 | unsigned pending_iteration; | |
113 | unsigned prepare_iteration; | |
114 | ||
a71fe8b8 LP |
115 | LIST_FIELDS(sd_event_source, sources); |
116 | ||
fd38203a LP |
117 | union { |
118 | struct { | |
718db961 | 119 | sd_event_io_handler_t callback; |
fd38203a LP |
120 | int fd; |
121 | uint32_t events; | |
122 | uint32_t revents; | |
123 | bool registered:1; | |
124 | } io; | |
125 | struct { | |
718db961 | 126 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
127 | usec_t next, accuracy; |
128 | unsigned earliest_index; | |
129 | unsigned latest_index; | |
fd38203a LP |
130 | } time; |
131 | struct { | |
718db961 | 132 | sd_event_signal_handler_t callback; |
fd38203a LP |
133 | struct signalfd_siginfo siginfo; |
134 | int sig; | |
135 | } signal; | |
136 | struct { | |
718db961 | 137 | sd_event_child_handler_t callback; |
fd38203a LP |
138 | siginfo_t siginfo; |
139 | pid_t pid; | |
140 | int options; | |
141 | } child; | |
142 | struct { | |
718db961 | 143 | sd_event_handler_t callback; |
fd38203a | 144 | } defer; |
6e9feda3 LP |
145 | struct { |
146 | sd_event_handler_t callback; | |
147 | } post; | |
da7e457c | 148 | struct { |
718db961 | 149 | sd_event_handler_t callback; |
da7e457c | 150 | unsigned prioq_index; |
6203e07a | 151 | } exit; |
fd38203a LP |
152 | }; |
153 | }; | |
154 | ||
6a0f1f6d | 155 | struct clock_data { |
9da4cb2b | 156 | WakeupType wakeup; |
6a0f1f6d LP |
157 | int fd; |
158 | ||
159 | /* For all clocks we maintain two priority queues each, one | |
160 | * ordered for the earliest times the events may be | |
161 | * dispatched, and one ordered by the latest times they must | |
162 | * have been dispatched. The range between the top entries in | |
163 | * the two prioqs is the time window we can freely schedule | |
164 | * wakeups in */ | |
165 | ||
166 | Prioq *earliest; | |
167 | Prioq *latest; | |
168 | usec_t next; | |
212bbb17 TG |
169 | |
170 | bool needs_rearm:1; | |
6a0f1f6d LP |
171 | }; |
172 | ||
9da4cb2b LP |
173 | struct signal_data { |
174 | WakeupType wakeup; | |
175 | ||
176 | /* For each priority we maintain one signal fd, so that we | |
177 | * only have to dequeue a single event per priority at a | |
178 | * time. */ | |
179 | ||
180 | int fd; | |
181 | int64_t priority; | |
182 | sigset_t sigset; | |
183 | sd_event_source *current; | |
184 | }; | |
185 | ||
fd38203a | 186 | struct sd_event { |
da7e457c | 187 | unsigned n_ref; |
fd38203a LP |
188 | |
189 | int epoll_fd; | |
cde93897 | 190 | int watchdog_fd; |
fd38203a LP |
191 | |
192 | Prioq *pending; | |
193 | Prioq *prepare; | |
c2ba3ad6 | 194 | |
a8548816 | 195 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
196 | * can add support for more clocks when the kernel learns to |
197 | * deal with them, too. */ | |
198 | struct clock_data realtime; | |
a8548816 | 199 | struct clock_data boottime; |
6a0f1f6d LP |
200 | struct clock_data monotonic; |
201 | struct clock_data realtime_alarm; | |
202 | struct clock_data boottime_alarm; | |
fd38203a | 203 | |
da7e457c LP |
204 | usec_t perturb; |
205 | ||
9da4cb2b LP |
206 | sd_event_source **signal_sources; /* indexed by signal number */ |
207 | Hashmap *signal_data; /* indexed by priority */ | |
fd38203a LP |
208 | |
209 | Hashmap *child_sources; | |
baf76283 | 210 | unsigned n_enabled_child_sources; |
fd38203a | 211 | |
6e9feda3 LP |
212 | Set *post_sources; |
213 | ||
6203e07a | 214 | Prioq *exit; |
fd38203a | 215 | |
da7e457c | 216 | pid_t original_pid; |
c2ba3ad6 | 217 | |
da7e457c | 218 | unsigned iteration; |
46e8c825 | 219 | dual_timestamp timestamp; |
6a0f1f6d | 220 | usec_t timestamp_boottime; |
da7e457c | 221 | int state; |
eaa3cbef | 222 | |
6203e07a | 223 | bool exit_requested:1; |
da7e457c | 224 | bool need_process_child:1; |
cde93897 | 225 | bool watchdog:1; |
34b87517 | 226 | bool profile_delays:1; |
afc6adb5 | 227 | |
6203e07a LP |
228 | int exit_code; |
229 | ||
afc6adb5 LP |
230 | pid_t tid; |
231 | sd_event **default_event_ptr; | |
cde93897 LP |
232 | |
233 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
234 | |
235 | unsigned n_sources; | |
a71fe8b8 LP |
236 | |
237 | LIST_HEAD(sd_event_source, sources); | |
34b87517 VC |
238 | |
239 | usec_t last_run, last_log; | |
240 | unsigned delays[sizeof(usec_t) * 8]; | |
fd38203a LP |
241 | }; |
242 | ||
a71fe8b8 LP |
243 | static void source_disconnect(sd_event_source *s); |
244 | ||
fd38203a LP |
245 | static int pending_prioq_compare(const void *a, const void *b) { |
246 | const sd_event_source *x = a, *y = b; | |
247 | ||
248 | assert(x->pending); | |
249 | assert(y->pending); | |
250 | ||
baf76283 LP |
251 | /* Enabled ones first */ |
252 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 253 | return -1; |
baf76283 | 254 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
255 | return 1; |
256 | ||
257 | /* Lower priority values first */ | |
258 | if (x->priority < y->priority) | |
259 | return -1; | |
260 | if (x->priority > y->priority) | |
261 | return 1; | |
262 | ||
263 | /* Older entries first */ | |
264 | if (x->pending_iteration < y->pending_iteration) | |
265 | return -1; | |
266 | if (x->pending_iteration > y->pending_iteration) | |
267 | return 1; | |
268 | ||
fd38203a LP |
269 | return 0; |
270 | } | |
271 | ||
272 | static int prepare_prioq_compare(const void *a, const void *b) { | |
273 | const sd_event_source *x = a, *y = b; | |
274 | ||
275 | assert(x->prepare); | |
276 | assert(y->prepare); | |
277 | ||
8046c457 KK |
278 | /* Enabled ones first */ |
279 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
280 | return -1; | |
281 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
282 | return 1; | |
283 | ||
fd38203a LP |
284 | /* Move most recently prepared ones last, so that we can stop |
285 | * preparing as soon as we hit one that has already been | |
286 | * prepared in the current iteration */ | |
287 | if (x->prepare_iteration < y->prepare_iteration) | |
288 | return -1; | |
289 | if (x->prepare_iteration > y->prepare_iteration) | |
290 | return 1; | |
291 | ||
fd38203a LP |
292 | /* Lower priority values first */ |
293 | if (x->priority < y->priority) | |
294 | return -1; | |
295 | if (x->priority > y->priority) | |
296 | return 1; | |
297 | ||
fd38203a LP |
298 | return 0; |
299 | } | |
300 | ||
c2ba3ad6 | 301 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
302 | const sd_event_source *x = a, *y = b; |
303 | ||
6a0f1f6d LP |
304 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
305 | assert(x->type == y->type); | |
fd38203a | 306 | |
baf76283 LP |
307 | /* Enabled ones first */ |
308 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 309 | return -1; |
baf76283 | 310 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
311 | return 1; |
312 | ||
313 | /* Move the pending ones to the end */ | |
314 | if (!x->pending && y->pending) | |
315 | return -1; | |
316 | if (x->pending && !y->pending) | |
317 | return 1; | |
318 | ||
319 | /* Order by time */ | |
320 | if (x->time.next < y->time.next) | |
321 | return -1; | |
322 | if (x->time.next > y->time.next) | |
a99badf5 | 323 | return 1; |
fd38203a | 324 | |
fd38203a LP |
325 | return 0; |
326 | } | |
327 | ||
1bce0ffa LP |
328 | static usec_t time_event_source_latest(const sd_event_source *s) { |
329 | return usec_add(s->time.next, s->time.accuracy); | |
330 | } | |
331 | ||
c2ba3ad6 LP |
332 | static int latest_time_prioq_compare(const void *a, const void *b) { |
333 | const sd_event_source *x = a, *y = b; | |
334 | ||
6a0f1f6d LP |
335 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
336 | assert(x->type == y->type); | |
c2ba3ad6 | 337 | |
baf76283 LP |
338 | /* Enabled ones first */ |
339 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 340 | return -1; |
baf76283 | 341 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
342 | return 1; |
343 | ||
344 | /* Move the pending ones to the end */ | |
345 | if (!x->pending && y->pending) | |
346 | return -1; | |
347 | if (x->pending && !y->pending) | |
348 | return 1; | |
349 | ||
350 | /* Order by time */ | |
1bce0ffa | 351 | if (time_event_source_latest(x) < time_event_source_latest(y)) |
c2ba3ad6 | 352 | return -1; |
1bce0ffa | 353 | if (time_event_source_latest(x) > time_event_source_latest(y)) |
a99badf5 | 354 | return 1; |
c2ba3ad6 | 355 | |
c2ba3ad6 LP |
356 | return 0; |
357 | } | |
358 | ||
6203e07a | 359 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
360 | const sd_event_source *x = a, *y = b; |
361 | ||
6203e07a LP |
362 | assert(x->type == SOURCE_EXIT); |
363 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 364 | |
baf76283 LP |
365 | /* Enabled ones first */ |
366 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 367 | return -1; |
baf76283 | 368 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
369 | return 1; |
370 | ||
371 | /* Lower priority values first */ | |
372 | if (x->priority < y->priority) | |
373 | return -1; | |
374 | if (x->priority > y->priority) | |
375 | return 1; | |
376 | ||
da7e457c LP |
377 | return 0; |
378 | } | |
379 | ||
6a0f1f6d LP |
380 | static void free_clock_data(struct clock_data *d) { |
381 | assert(d); | |
9da4cb2b | 382 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
383 | |
384 | safe_close(d->fd); | |
385 | prioq_free(d->earliest); | |
386 | prioq_free(d->latest); | |
387 | } | |
388 | ||
fd38203a | 389 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
390 | sd_event_source *s; |
391 | ||
fd38203a | 392 | assert(e); |
a71fe8b8 LP |
393 | |
394 | while ((s = e->sources)) { | |
395 | assert(s->floating); | |
396 | source_disconnect(s); | |
397 | sd_event_source_unref(s); | |
398 | } | |
399 | ||
15b38f93 | 400 | assert(e->n_sources == 0); |
fd38203a | 401 | |
afc6adb5 LP |
402 | if (e->default_event_ptr) |
403 | *(e->default_event_ptr) = NULL; | |
404 | ||
03e334a1 | 405 | safe_close(e->epoll_fd); |
03e334a1 | 406 | safe_close(e->watchdog_fd); |
cde93897 | 407 | |
6a0f1f6d | 408 | free_clock_data(&e->realtime); |
a8548816 | 409 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
410 | free_clock_data(&e->monotonic); |
411 | free_clock_data(&e->realtime_alarm); | |
412 | free_clock_data(&e->boottime_alarm); | |
413 | ||
fd38203a LP |
414 | prioq_free(e->pending); |
415 | prioq_free(e->prepare); | |
6203e07a | 416 | prioq_free(e->exit); |
fd38203a LP |
417 | |
418 | free(e->signal_sources); | |
9da4cb2b | 419 | hashmap_free(e->signal_data); |
fd38203a LP |
420 | |
421 | hashmap_free(e->child_sources); | |
6e9feda3 | 422 | set_free(e->post_sources); |
fd38203a LP |
423 | free(e); |
424 | } | |
425 | ||
f7262a9f | 426 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
427 | sd_event *e; |
428 | int r; | |
429 | ||
305f78bf | 430 | assert_return(ret, -EINVAL); |
fd38203a LP |
431 | |
432 | e = new0(sd_event, 1); | |
433 | if (!e) | |
434 | return -ENOMEM; | |
435 | ||
da7e457c | 436 | e->n_ref = 1; |
9da4cb2b | 437 | 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 | 438 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
9da4cb2b | 439 | e->realtime.wakeup = e->boottime.wakeup = e->monotonic.wakeup = e->realtime_alarm.wakeup = e->boottime_alarm.wakeup = WAKEUP_CLOCK_DATA; |
eaa3cbef | 440 | e->original_pid = getpid(); |
3a43da28 | 441 | e->perturb = USEC_INFINITY; |
fd38203a | 442 | |
c983e776 EV |
443 | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
444 | if (r < 0) | |
fd38203a | 445 | goto fail; |
fd38203a LP |
446 | |
447 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
448 | if (e->epoll_fd < 0) { | |
449 | r = -errno; | |
450 | goto fail; | |
451 | } | |
452 | ||
34b87517 | 453 | if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) { |
34a6843d | 454 | 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 |
455 | e->profile_delays = true; |
456 | } | |
457 | ||
fd38203a LP |
458 | *ret = e; |
459 | return 0; | |
460 | ||
461 | fail: | |
462 | event_free(e); | |
463 | return r; | |
464 | } | |
465 | ||
f7262a9f | 466 | _public_ sd_event* sd_event_ref(sd_event *e) { |
6680dd6b LP |
467 | |
468 | if (!e) | |
469 | return NULL; | |
fd38203a | 470 | |
da7e457c LP |
471 | assert(e->n_ref >= 1); |
472 | e->n_ref++; | |
fd38203a LP |
473 | |
474 | return e; | |
475 | } | |
476 | ||
f7262a9f | 477 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
478 | |
479 | if (!e) | |
480 | return NULL; | |
fd38203a | 481 | |
da7e457c LP |
482 | assert(e->n_ref >= 1); |
483 | e->n_ref--; | |
484 | ||
485 | if (e->n_ref <= 0) | |
fd38203a LP |
486 | event_free(e); |
487 | ||
488 | return NULL; | |
489 | } | |
490 | ||
eaa3cbef LP |
491 | static bool event_pid_changed(sd_event *e) { |
492 | assert(e); | |
493 | ||
a2360a46 | 494 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
495 | * it around over a fork(). Let's complain. */ |
496 | ||
497 | return e->original_pid != getpid(); | |
498 | } | |
499 | ||
366e6411 | 500 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
501 | int r; |
502 | ||
503 | assert(s); | |
504 | assert(s->type == SOURCE_IO); | |
505 | ||
f6806734 | 506 | if (event_pid_changed(s->event)) |
366e6411 | 507 | return; |
f6806734 | 508 | |
fd38203a | 509 | if (!s->io.registered) |
366e6411 | 510 | return; |
fd38203a LP |
511 | |
512 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
556c25cf | 513 | if (r < 0) |
55cbfaa5 DM |
514 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m", |
515 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a LP |
516 | |
517 | s->io.registered = false; | |
fd38203a LP |
518 | } |
519 | ||
305f78bf LP |
520 | static int source_io_register( |
521 | sd_event_source *s, | |
522 | int enabled, | |
523 | uint32_t events) { | |
524 | ||
fd38203a LP |
525 | struct epoll_event ev = {}; |
526 | int r; | |
527 | ||
528 | assert(s); | |
529 | assert(s->type == SOURCE_IO); | |
baf76283 | 530 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
531 | |
532 | ev.events = events; | |
533 | ev.data.ptr = s; | |
534 | ||
baf76283 | 535 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
536 | ev.events |= EPOLLONESHOT; |
537 | ||
538 | if (s->io.registered) | |
539 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
540 | else | |
541 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
fd38203a LP |
542 | if (r < 0) |
543 | return -errno; | |
544 | ||
545 | s->io.registered = true; | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
6a0f1f6d LP |
550 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
551 | ||
552 | switch (t) { | |
553 | ||
554 | case SOURCE_TIME_REALTIME: | |
555 | return CLOCK_REALTIME; | |
556 | ||
a8548816 TG |
557 | case SOURCE_TIME_BOOTTIME: |
558 | return CLOCK_BOOTTIME; | |
559 | ||
6a0f1f6d LP |
560 | case SOURCE_TIME_MONOTONIC: |
561 | return CLOCK_MONOTONIC; | |
562 | ||
563 | case SOURCE_TIME_REALTIME_ALARM: | |
564 | return CLOCK_REALTIME_ALARM; | |
565 | ||
566 | case SOURCE_TIME_BOOTTIME_ALARM: | |
567 | return CLOCK_BOOTTIME_ALARM; | |
568 | ||
569 | default: | |
570 | return (clockid_t) -1; | |
571 | } | |
572 | } | |
573 | ||
574 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
575 | ||
576 | switch (clock) { | |
577 | ||
578 | case CLOCK_REALTIME: | |
579 | return SOURCE_TIME_REALTIME; | |
580 | ||
a8548816 TG |
581 | case CLOCK_BOOTTIME: |
582 | return SOURCE_TIME_BOOTTIME; | |
583 | ||
6a0f1f6d LP |
584 | case CLOCK_MONOTONIC: |
585 | return SOURCE_TIME_MONOTONIC; | |
586 | ||
587 | case CLOCK_REALTIME_ALARM: | |
588 | return SOURCE_TIME_REALTIME_ALARM; | |
589 | ||
590 | case CLOCK_BOOTTIME_ALARM: | |
591 | return SOURCE_TIME_BOOTTIME_ALARM; | |
592 | ||
593 | default: | |
594 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
595 | } | |
596 | } | |
597 | ||
598 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
599 | assert(e); | |
600 | ||
601 | switch (t) { | |
602 | ||
603 | case SOURCE_TIME_REALTIME: | |
604 | return &e->realtime; | |
605 | ||
a8548816 TG |
606 | case SOURCE_TIME_BOOTTIME: |
607 | return &e->boottime; | |
608 | ||
6a0f1f6d LP |
609 | case SOURCE_TIME_MONOTONIC: |
610 | return &e->monotonic; | |
611 | ||
612 | case SOURCE_TIME_REALTIME_ALARM: | |
613 | return &e->realtime_alarm; | |
614 | ||
615 | case SOURCE_TIME_BOOTTIME_ALARM: | |
616 | return &e->boottime_alarm; | |
617 | ||
618 | default: | |
619 | return NULL; | |
620 | } | |
621 | } | |
622 | ||
9da4cb2b LP |
623 | static int event_make_signal_data( |
624 | sd_event *e, | |
625 | int sig, | |
626 | struct signal_data **ret) { | |
4807d2d0 | 627 | |
f95387cd | 628 | struct epoll_event ev = {}; |
9da4cb2b LP |
629 | struct signal_data *d; |
630 | bool added = false; | |
631 | sigset_t ss_copy; | |
632 | int64_t priority; | |
f95387cd ZJS |
633 | int r; |
634 | ||
635 | assert(e); | |
636 | ||
f6806734 | 637 | if (event_pid_changed(e)) |
9da4cb2b | 638 | return -ECHILD; |
f6806734 | 639 | |
9da4cb2b LP |
640 | if (e->signal_sources && e->signal_sources[sig]) |
641 | priority = e->signal_sources[sig]->priority; | |
642 | else | |
643 | priority = 0; | |
f95387cd | 644 | |
9da4cb2b LP |
645 | d = hashmap_get(e->signal_data, &priority); |
646 | if (d) { | |
647 | if (sigismember(&d->sigset, sig) > 0) { | |
648 | if (ret) | |
649 | *ret = d; | |
650 | return 0; | |
651 | } | |
652 | } else { | |
653 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); | |
654 | if (r < 0) | |
655 | return r; | |
656 | ||
657 | d = new0(struct signal_data, 1); | |
658 | if (!d) | |
659 | return -ENOMEM; | |
660 | ||
661 | d->wakeup = WAKEUP_SIGNAL_DATA; | |
662 | d->fd = -1; | |
663 | d->priority = priority; | |
664 | ||
665 | r = hashmap_put(e->signal_data, &d->priority, d); | |
90f604d1 ZJS |
666 | if (r < 0) { |
667 | free(d); | |
9da4cb2b | 668 | return r; |
90f604d1 | 669 | } |
f95387cd | 670 | |
9da4cb2b LP |
671 | added = true; |
672 | } | |
673 | ||
674 | ss_copy = d->sigset; | |
675 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
676 | ||
677 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
678 | if (r < 0) { | |
679 | r = -errno; | |
680 | goto fail; | |
681 | } | |
682 | ||
683 | d->sigset = ss_copy; | |
f95387cd | 684 | |
9da4cb2b LP |
685 | if (d->fd >= 0) { |
686 | if (ret) | |
687 | *ret = d; | |
f95387cd | 688 | return 0; |
9da4cb2b LP |
689 | } |
690 | ||
691 | d->fd = r; | |
f95387cd ZJS |
692 | |
693 | ev.events = EPOLLIN; | |
9da4cb2b | 694 | ev.data.ptr = d; |
f95387cd | 695 | |
9da4cb2b LP |
696 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
697 | if (r < 0) { | |
698 | r = -errno; | |
699 | goto fail; | |
f95387cd ZJS |
700 | } |
701 | ||
9da4cb2b LP |
702 | if (ret) |
703 | *ret = d; | |
704 | ||
f95387cd | 705 | return 0; |
9da4cb2b LP |
706 | |
707 | fail: | |
708 | if (added) { | |
709 | d->fd = safe_close(d->fd); | |
710 | hashmap_remove(e->signal_data, &d->priority); | |
711 | free(d); | |
712 | } | |
713 | ||
714 | return r; | |
715 | } | |
716 | ||
717 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
718 | assert(e); | |
719 | assert(d); | |
720 | ||
721 | /* Turns off the specified signal in the signal data | |
722 | * object. If the signal mask of the object becomes empty that | |
723 | * way removes it. */ | |
724 | ||
725 | if (sigismember(&d->sigset, sig) == 0) | |
726 | return; | |
727 | ||
728 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
729 | ||
730 | if (sigisemptyset(&d->sigset)) { | |
731 | ||
732 | /* If all the mask is all-zero we can get rid of the structure */ | |
733 | hashmap_remove(e->signal_data, &d->priority); | |
734 | assert(!d->current); | |
735 | safe_close(d->fd); | |
736 | free(d); | |
737 | return; | |
738 | } | |
739 | ||
740 | assert(d->fd >= 0); | |
741 | ||
742 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
743 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
744 | } | |
745 | ||
746 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
747 | struct signal_data *d; | |
748 | static const int64_t zero_priority = 0; | |
749 | ||
750 | assert(e); | |
751 | ||
752 | /* Rechecks if the specified signal is still something we are | |
753 | * interested in. If not, we'll unmask it, and possibly drop | |
754 | * the signalfd for it. */ | |
755 | ||
756 | if (sig == SIGCHLD && | |
757 | e->n_enabled_child_sources > 0) | |
758 | return; | |
759 | ||
760 | if (e->signal_sources && | |
761 | e->signal_sources[sig] && | |
762 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
763 | return; | |
764 | ||
765 | /* | |
766 | * The specified signal might be enabled in three different queues: | |
767 | * | |
768 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
769 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
770 | * 3) the 0 priority (to cover the SIGCHLD case) | |
771 | * | |
772 | * Hence, let's remove it from all three here. | |
773 | */ | |
774 | ||
775 | if (priority) { | |
776 | d = hashmap_get(e->signal_data, priority); | |
777 | if (d) | |
778 | event_unmask_signal_data(e, d, sig); | |
779 | } | |
780 | ||
781 | if (e->signal_sources && e->signal_sources[sig]) { | |
782 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
783 | if (d) | |
784 | event_unmask_signal_data(e, d, sig); | |
785 | } | |
786 | ||
787 | d = hashmap_get(e->signal_data, &zero_priority); | |
788 | if (d) | |
789 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
790 | } |
791 | ||
a71fe8b8 LP |
792 | static void source_disconnect(sd_event_source *s) { |
793 | sd_event *event; | |
794 | ||
fd38203a LP |
795 | assert(s); |
796 | ||
a71fe8b8 LP |
797 | if (!s->event) |
798 | return; | |
15b38f93 | 799 | |
a71fe8b8 | 800 | assert(s->event->n_sources > 0); |
fd38203a | 801 | |
a71fe8b8 | 802 | switch (s->type) { |
fd38203a | 803 | |
a71fe8b8 LP |
804 | case SOURCE_IO: |
805 | if (s->io.fd >= 0) | |
806 | source_io_unregister(s); | |
fd38203a | 807 | |
a71fe8b8 | 808 | break; |
6a0f1f6d | 809 | |
a71fe8b8 | 810 | case SOURCE_TIME_REALTIME: |
a8548816 | 811 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
812 | case SOURCE_TIME_MONOTONIC: |
813 | case SOURCE_TIME_REALTIME_ALARM: | |
814 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
815 | struct clock_data *d; | |
fd38203a | 816 | |
a71fe8b8 LP |
817 | d = event_get_clock_data(s->event, s->type); |
818 | assert(d); | |
819 | ||
820 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
821 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 822 | d->needs_rearm = true; |
a71fe8b8 LP |
823 | break; |
824 | } | |
825 | ||
826 | case SOURCE_SIGNAL: | |
827 | if (s->signal.sig > 0) { | |
9da4cb2b | 828 | |
a71fe8b8 LP |
829 | if (s->event->signal_sources) |
830 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 831 | |
9da4cb2b | 832 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 833 | } |
fd38203a | 834 | |
a71fe8b8 | 835 | break; |
fd38203a | 836 | |
a71fe8b8 LP |
837 | case SOURCE_CHILD: |
838 | if (s->child.pid > 0) { | |
839 | if (s->enabled != SD_EVENT_OFF) { | |
840 | assert(s->event->n_enabled_child_sources > 0); | |
841 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 842 | } |
fd38203a | 843 | |
4a0b58c4 | 844 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
9da4cb2b | 845 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
a71fe8b8 | 846 | } |
fd38203a | 847 | |
a71fe8b8 | 848 | break; |
fd38203a | 849 | |
a71fe8b8 LP |
850 | case SOURCE_DEFER: |
851 | /* nothing */ | |
852 | break; | |
fd38203a | 853 | |
a71fe8b8 LP |
854 | case SOURCE_POST: |
855 | set_remove(s->event->post_sources, s); | |
856 | break; | |
da7e457c | 857 | |
a71fe8b8 LP |
858 | case SOURCE_EXIT: |
859 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
860 | break; | |
0eb2e0e3 | 861 | |
a71fe8b8 LP |
862 | default: |
863 | assert_not_reached("Wut? I shouldn't exist."); | |
864 | } | |
6e9feda3 | 865 | |
a71fe8b8 LP |
866 | if (s->pending) |
867 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 868 | |
a71fe8b8 LP |
869 | if (s->prepare) |
870 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 871 | |
a71fe8b8 | 872 | event = s->event; |
fd38203a | 873 | |
a71fe8b8 LP |
874 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
875 | s->event = NULL; | |
876 | LIST_REMOVE(sources, event->sources, s); | |
877 | event->n_sources--; | |
fd38203a | 878 | |
a71fe8b8 LP |
879 | if (!s->floating) |
880 | sd_event_unref(event); | |
881 | } | |
882 | ||
883 | static void source_free(sd_event_source *s) { | |
884 | assert(s); | |
fd38203a | 885 | |
a71fe8b8 | 886 | source_disconnect(s); |
356779df | 887 | free(s->description); |
fd38203a LP |
888 | free(s); |
889 | } | |
890 | ||
891 | static int source_set_pending(sd_event_source *s, bool b) { | |
892 | int r; | |
893 | ||
894 | assert(s); | |
6203e07a | 895 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
896 | |
897 | if (s->pending == b) | |
898 | return 0; | |
899 | ||
900 | s->pending = b; | |
901 | ||
902 | if (b) { | |
903 | s->pending_iteration = s->event->iteration; | |
904 | ||
905 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
906 | if (r < 0) { | |
907 | s->pending = false; | |
908 | return r; | |
909 | } | |
910 | } else | |
911 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
912 | ||
6a0f1f6d LP |
913 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
914 | struct clock_data *d; | |
915 | ||
916 | d = event_get_clock_data(s->event, s->type); | |
917 | assert(d); | |
918 | ||
919 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
920 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 921 | d->needs_rearm = true; |
2576a19e LP |
922 | } |
923 | ||
9da4cb2b LP |
924 | if (s->type == SOURCE_SIGNAL && !b) { |
925 | struct signal_data *d; | |
926 | ||
927 | d = hashmap_get(s->event->signal_data, &s->priority); | |
928 | if (d && d->current == s) | |
929 | d->current = NULL; | |
930 | } | |
931 | ||
fd38203a LP |
932 | return 0; |
933 | } | |
934 | ||
a71fe8b8 | 935 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
936 | sd_event_source *s; |
937 | ||
938 | assert(e); | |
939 | ||
940 | s = new0(sd_event_source, 1); | |
941 | if (!s) | |
942 | return NULL; | |
943 | ||
da7e457c | 944 | s->n_ref = 1; |
a71fe8b8 | 945 | s->event = e; |
4a134c49 | 946 | s->floating = floating; |
fd38203a | 947 | s->type = type; |
fd38203a | 948 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
949 | |
950 | if (!floating) | |
951 | sd_event_ref(e); | |
fd38203a | 952 | |
a71fe8b8 | 953 | LIST_PREPEND(sources, e->sources, s); |
313cefa1 | 954 | e->n_sources++; |
15b38f93 | 955 | |
fd38203a LP |
956 | return s; |
957 | } | |
958 | ||
f7262a9f | 959 | _public_ int sd_event_add_io( |
fd38203a | 960 | sd_event *e, |
151b9b96 | 961 | sd_event_source **ret, |
fd38203a LP |
962 | int fd, |
963 | uint32_t events, | |
718db961 | 964 | sd_event_io_handler_t callback, |
151b9b96 | 965 | void *userdata) { |
fd38203a LP |
966 | |
967 | sd_event_source *s; | |
968 | int r; | |
969 | ||
305f78bf | 970 | assert_return(e, -EINVAL); |
8ac43fee | 971 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 972 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 973 | assert_return(callback, -EINVAL); |
da7e457c | 974 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 975 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 976 | |
a71fe8b8 | 977 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
978 | if (!s) |
979 | return -ENOMEM; | |
980 | ||
9da4cb2b | 981 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
982 | s->io.fd = fd; |
983 | s->io.events = events; | |
984 | s->io.callback = callback; | |
985 | s->userdata = userdata; | |
baf76283 | 986 | s->enabled = SD_EVENT_ON; |
fd38203a | 987 | |
baf76283 | 988 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
989 | if (r < 0) { |
990 | source_free(s); | |
050f74f2 | 991 | return r; |
fd38203a LP |
992 | } |
993 | ||
a71fe8b8 LP |
994 | if (ret) |
995 | *ret = s; | |
996 | ||
fd38203a LP |
997 | return 0; |
998 | } | |
999 | ||
52444dc4 LP |
1000 | static void initialize_perturb(sd_event *e) { |
1001 | sd_id128_t bootid = {}; | |
1002 | ||
1003 | /* When we sleep for longer, we try to realign the wakeup to | |
1004 | the same time wihtin each minute/second/250ms, so that | |
1005 | events all across the system can be coalesced into a single | |
1006 | CPU wakeup. However, let's take some system-specific | |
1007 | randomness for this value, so that in a network of systems | |
1008 | with synced clocks timer events are distributed a | |
1009 | bit. Here, we calculate a perturbation usec offset from the | |
1010 | boot ID. */ | |
1011 | ||
3a43da28 | 1012 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
1013 | return; |
1014 | ||
1015 | if (sd_id128_get_boot(&bootid) >= 0) | |
1016 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
1017 | } | |
1018 | ||
fd38203a LP |
1019 | static int event_setup_timer_fd( |
1020 | sd_event *e, | |
6a0f1f6d LP |
1021 | struct clock_data *d, |
1022 | clockid_t clock) { | |
fd38203a LP |
1023 | |
1024 | struct epoll_event ev = {}; | |
1025 | int r, fd; | |
1026 | ||
1027 | assert(e); | |
6a0f1f6d | 1028 | assert(d); |
fd38203a | 1029 | |
6a0f1f6d | 1030 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
1031 | return 0; |
1032 | ||
6a0f1f6d | 1033 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
1034 | if (fd < 0) |
1035 | return -errno; | |
1036 | ||
1037 | ev.events = EPOLLIN; | |
9da4cb2b | 1038 | ev.data.ptr = d; |
fd38203a LP |
1039 | |
1040 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
1041 | if (r < 0) { | |
03e334a1 | 1042 | safe_close(fd); |
fd38203a LP |
1043 | return -errno; |
1044 | } | |
1045 | ||
6a0f1f6d | 1046 | d->fd = fd; |
fd38203a LP |
1047 | return 0; |
1048 | } | |
1049 | ||
c4f1aff2 TG |
1050 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1051 | assert(s); | |
1052 | ||
1053 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1054 | } | |
1055 | ||
6a0f1f6d | 1056 | _public_ int sd_event_add_time( |
fd38203a | 1057 | sd_event *e, |
151b9b96 | 1058 | sd_event_source **ret, |
6a0f1f6d | 1059 | clockid_t clock, |
fd38203a | 1060 | uint64_t usec, |
c2ba3ad6 | 1061 | uint64_t accuracy, |
718db961 | 1062 | sd_event_time_handler_t callback, |
151b9b96 | 1063 | void *userdata) { |
fd38203a | 1064 | |
6a0f1f6d | 1065 | EventSourceType type; |
fd38203a | 1066 | sd_event_source *s; |
6a0f1f6d | 1067 | struct clock_data *d; |
fd38203a LP |
1068 | int r; |
1069 | ||
305f78bf | 1070 | assert_return(e, -EINVAL); |
305f78bf | 1071 | assert_return(accuracy != (uint64_t) -1, -EINVAL); |
da7e457c | 1072 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1073 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1074 | |
c4f1aff2 TG |
1075 | if (!callback) |
1076 | callback = time_exit_callback; | |
1077 | ||
6a0f1f6d | 1078 | type = clock_to_event_source_type(clock); |
15411c0c | 1079 | assert_return(type >= 0, -EOPNOTSUPP); |
6a0f1f6d LP |
1080 | |
1081 | d = event_get_clock_data(e, type); | |
1082 | assert(d); | |
c2ba3ad6 | 1083 | |
c983e776 EV |
1084 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1085 | if (r < 0) | |
1086 | return r; | |
fd38203a | 1087 | |
c983e776 EV |
1088 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1089 | if (r < 0) | |
1090 | return r; | |
fd38203a | 1091 | |
6a0f1f6d LP |
1092 | if (d->fd < 0) { |
1093 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1094 | if (r < 0) |
1095 | return r; | |
1096 | } | |
1097 | ||
a71fe8b8 | 1098 | s = source_new(e, !ret, type); |
fd38203a LP |
1099 | if (!s) |
1100 | return -ENOMEM; | |
1101 | ||
1102 | s->time.next = usec; | |
c2ba3ad6 | 1103 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1104 | s->time.callback = callback; |
da7e457c | 1105 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1106 | s->userdata = userdata; |
baf76283 | 1107 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1108 | |
e07bbb7c TG |
1109 | d->needs_rearm = true; |
1110 | ||
6a0f1f6d | 1111 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
1112 | if (r < 0) |
1113 | goto fail; | |
1114 | ||
6a0f1f6d | 1115 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
1116 | if (r < 0) |
1117 | goto fail; | |
fd38203a | 1118 | |
a71fe8b8 LP |
1119 | if (ret) |
1120 | *ret = s; | |
1121 | ||
fd38203a | 1122 | return 0; |
c2ba3ad6 LP |
1123 | |
1124 | fail: | |
1125 | source_free(s); | |
1126 | return r; | |
fd38203a LP |
1127 | } |
1128 | ||
59bc1fd7 LP |
1129 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1130 | assert(s); | |
1131 | ||
1132 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1133 | } | |
1134 | ||
f7262a9f | 1135 | _public_ int sd_event_add_signal( |
305f78bf | 1136 | sd_event *e, |
151b9b96 | 1137 | sd_event_source **ret, |
305f78bf | 1138 | int sig, |
718db961 | 1139 | sd_event_signal_handler_t callback, |
151b9b96 | 1140 | void *userdata) { |
305f78bf | 1141 | |
fd38203a | 1142 | sd_event_source *s; |
9da4cb2b | 1143 | struct signal_data *d; |
3022d74b | 1144 | sigset_t ss; |
fd38203a LP |
1145 | int r; |
1146 | ||
305f78bf LP |
1147 | assert_return(e, -EINVAL); |
1148 | assert_return(sig > 0, -EINVAL); | |
1149 | assert_return(sig < _NSIG, -EINVAL); | |
da7e457c | 1150 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1151 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1152 | |
59bc1fd7 LP |
1153 | if (!callback) |
1154 | callback = signal_exit_callback; | |
1155 | ||
3022d74b | 1156 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
50e0d56c LP |
1157 | if (r != 0) |
1158 | return -r; | |
3022d74b LP |
1159 | |
1160 | if (!sigismember(&ss, sig)) | |
1161 | return -EBUSY; | |
1162 | ||
fd38203a LP |
1163 | if (!e->signal_sources) { |
1164 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1165 | if (!e->signal_sources) | |
1166 | return -ENOMEM; | |
1167 | } else if (e->signal_sources[sig]) | |
1168 | return -EBUSY; | |
1169 | ||
a71fe8b8 | 1170 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1171 | if (!s) |
1172 | return -ENOMEM; | |
1173 | ||
1174 | s->signal.sig = sig; | |
1175 | s->signal.callback = callback; | |
1176 | s->userdata = userdata; | |
baf76283 | 1177 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1178 | |
1179 | e->signal_sources[sig] = s; | |
fd38203a | 1180 | |
9da4cb2b LP |
1181 | r = event_make_signal_data(e, sig, &d); |
1182 | if (r < 0) { | |
1183 | source_free(s); | |
1184 | return r; | |
fd38203a LP |
1185 | } |
1186 | ||
f1f00dbb LP |
1187 | /* Use the signal name as description for the event source by default */ |
1188 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1189 | ||
a71fe8b8 LP |
1190 | if (ret) |
1191 | *ret = s; | |
1192 | ||
fd38203a LP |
1193 | return 0; |
1194 | } | |
1195 | ||
f7262a9f | 1196 | _public_ int sd_event_add_child( |
305f78bf | 1197 | sd_event *e, |
151b9b96 | 1198 | sd_event_source **ret, |
305f78bf LP |
1199 | pid_t pid, |
1200 | int options, | |
718db961 | 1201 | sd_event_child_handler_t callback, |
151b9b96 | 1202 | void *userdata) { |
305f78bf | 1203 | |
fd38203a LP |
1204 | sd_event_source *s; |
1205 | int r; | |
1206 | ||
305f78bf LP |
1207 | assert_return(e, -EINVAL); |
1208 | assert_return(pid > 1, -EINVAL); | |
1209 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1210 | assert_return(options != 0, -EINVAL); | |
1211 | assert_return(callback, -EINVAL); | |
da7e457c | 1212 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1213 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1214 | |
d5099efc | 1215 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1216 | if (r < 0) |
1217 | return r; | |
1218 | ||
4a0b58c4 | 1219 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1220 | return -EBUSY; |
1221 | ||
a71fe8b8 | 1222 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1223 | if (!s) |
1224 | return -ENOMEM; | |
1225 | ||
1226 | s->child.pid = pid; | |
1227 | s->child.options = options; | |
1228 | s->child.callback = callback; | |
1229 | s->userdata = userdata; | |
baf76283 | 1230 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1231 | |
4a0b58c4 | 1232 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
fd38203a LP |
1233 | if (r < 0) { |
1234 | source_free(s); | |
1235 | return r; | |
1236 | } | |
1237 | ||
313cefa1 | 1238 | e->n_enabled_child_sources++; |
fd38203a | 1239 | |
9da4cb2b LP |
1240 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1241 | if (r < 0) { | |
1242 | e->n_enabled_child_sources--; | |
1243 | source_free(s); | |
1244 | return r; | |
fd38203a LP |
1245 | } |
1246 | ||
c2ba3ad6 LP |
1247 | e->need_process_child = true; |
1248 | ||
a71fe8b8 LP |
1249 | if (ret) |
1250 | *ret = s; | |
1251 | ||
fd38203a LP |
1252 | return 0; |
1253 | } | |
1254 | ||
f7262a9f | 1255 | _public_ int sd_event_add_defer( |
305f78bf | 1256 | sd_event *e, |
151b9b96 | 1257 | sd_event_source **ret, |
718db961 | 1258 | sd_event_handler_t callback, |
151b9b96 | 1259 | void *userdata) { |
305f78bf | 1260 | |
fd38203a LP |
1261 | sd_event_source *s; |
1262 | int r; | |
1263 | ||
305f78bf LP |
1264 | assert_return(e, -EINVAL); |
1265 | assert_return(callback, -EINVAL); | |
da7e457c | 1266 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1267 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1268 | |
a71fe8b8 | 1269 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1270 | if (!s) |
1271 | return -ENOMEM; | |
1272 | ||
1273 | s->defer.callback = callback; | |
1274 | s->userdata = userdata; | |
baf76283 | 1275 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1276 | |
1277 | r = source_set_pending(s, true); | |
1278 | if (r < 0) { | |
1279 | source_free(s); | |
1280 | return r; | |
1281 | } | |
1282 | ||
a71fe8b8 LP |
1283 | if (ret) |
1284 | *ret = s; | |
1285 | ||
fd38203a LP |
1286 | return 0; |
1287 | } | |
1288 | ||
6e9feda3 LP |
1289 | _public_ int sd_event_add_post( |
1290 | sd_event *e, | |
1291 | sd_event_source **ret, | |
1292 | sd_event_handler_t callback, | |
1293 | void *userdata) { | |
1294 | ||
1295 | sd_event_source *s; | |
1296 | int r; | |
1297 | ||
1298 | assert_return(e, -EINVAL); | |
1299 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1300 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1301 | assert_return(!event_pid_changed(e), -ECHILD); | |
1302 | ||
d5099efc | 1303 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1304 | if (r < 0) |
1305 | return r; | |
1306 | ||
a71fe8b8 | 1307 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1308 | if (!s) |
1309 | return -ENOMEM; | |
1310 | ||
1311 | s->post.callback = callback; | |
1312 | s->userdata = userdata; | |
1313 | s->enabled = SD_EVENT_ON; | |
1314 | ||
1315 | r = set_put(e->post_sources, s); | |
1316 | if (r < 0) { | |
1317 | source_free(s); | |
1318 | return r; | |
1319 | } | |
1320 | ||
a71fe8b8 LP |
1321 | if (ret) |
1322 | *ret = s; | |
1323 | ||
6e9feda3 LP |
1324 | return 0; |
1325 | } | |
1326 | ||
6203e07a | 1327 | _public_ int sd_event_add_exit( |
305f78bf | 1328 | sd_event *e, |
151b9b96 | 1329 | sd_event_source **ret, |
718db961 | 1330 | sd_event_handler_t callback, |
151b9b96 | 1331 | void *userdata) { |
305f78bf | 1332 | |
da7e457c LP |
1333 | sd_event_source *s; |
1334 | int r; | |
1335 | ||
1336 | assert_return(e, -EINVAL); | |
1337 | assert_return(callback, -EINVAL); | |
1338 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1339 | assert_return(!event_pid_changed(e), -ECHILD); | |
1340 | ||
c983e776 EV |
1341 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1342 | if (r < 0) | |
1343 | return r; | |
da7e457c | 1344 | |
a71fe8b8 | 1345 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1346 | if (!s) |
da7e457c | 1347 | return -ENOMEM; |
fd38203a | 1348 | |
6203e07a | 1349 | s->exit.callback = callback; |
da7e457c | 1350 | s->userdata = userdata; |
6203e07a | 1351 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1352 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1353 | |
6203e07a | 1354 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1355 | if (r < 0) { |
1356 | source_free(s); | |
1357 | return r; | |
1358 | } | |
1359 | ||
a71fe8b8 LP |
1360 | if (ret) |
1361 | *ret = s; | |
1362 | ||
da7e457c LP |
1363 | return 0; |
1364 | } | |
1365 | ||
f7262a9f | 1366 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
6680dd6b LP |
1367 | |
1368 | if (!s) | |
1369 | return NULL; | |
da7e457c LP |
1370 | |
1371 | assert(s->n_ref >= 1); | |
1372 | s->n_ref++; | |
fd38203a LP |
1373 | |
1374 | return s; | |
1375 | } | |
1376 | ||
f7262a9f | 1377 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1378 | |
1379 | if (!s) | |
1380 | return NULL; | |
fd38203a | 1381 | |
da7e457c LP |
1382 | assert(s->n_ref >= 1); |
1383 | s->n_ref--; | |
1384 | ||
12179984 LP |
1385 | if (s->n_ref <= 0) { |
1386 | /* Here's a special hack: when we are called from a | |
1387 | * dispatch handler we won't free the event source | |
1388 | * immediately, but we will detach the fd from the | |
1389 | * epoll. This way it is safe for the caller to unref | |
1390 | * the event source and immediately close the fd, but | |
1391 | * we still retain a valid event source object after | |
1392 | * the callback. */ | |
1393 | ||
1394 | if (s->dispatching) { | |
1395 | if (s->type == SOURCE_IO) | |
1396 | source_io_unregister(s); | |
a71fe8b8 LP |
1397 | |
1398 | source_disconnect(s); | |
12179984 LP |
1399 | } else |
1400 | source_free(s); | |
1401 | } | |
fd38203a LP |
1402 | |
1403 | return NULL; | |
1404 | } | |
1405 | ||
356779df | 1406 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1407 | assert_return(s, -EINVAL); |
f4b2933e | 1408 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1409 | |
356779df | 1410 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1411 | } |
1412 | ||
356779df | 1413 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1414 | assert_return(s, -EINVAL); |
356779df | 1415 | assert_return(description, -EINVAL); |
f4b2933e LP |
1416 | assert_return(s->description, -ENXIO); |
1417 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
f7f53e9e | 1418 | |
356779df | 1419 | *description = s->description; |
f7f53e9e TG |
1420 | return 0; |
1421 | } | |
1422 | ||
adcc4ca3 | 1423 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1424 | assert_return(s, NULL); |
eaa3cbef LP |
1425 | |
1426 | return s->event; | |
1427 | } | |
1428 | ||
f7262a9f | 1429 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1430 | assert_return(s, -EINVAL); |
6203e07a | 1431 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1432 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1433 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1434 | |
1435 | return s->pending; | |
1436 | } | |
1437 | ||
f7262a9f | 1438 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1439 | assert_return(s, -EINVAL); |
1440 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1441 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1442 | |
1443 | return s->io.fd; | |
1444 | } | |
1445 | ||
30caf8f3 LP |
1446 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1447 | int r; | |
1448 | ||
1449 | assert_return(s, -EINVAL); | |
8ac43fee | 1450 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1451 | assert_return(s->type == SOURCE_IO, -EDOM); |
1452 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1453 | ||
1454 | if (s->io.fd == fd) | |
1455 | return 0; | |
1456 | ||
1457 | if (s->enabled == SD_EVENT_OFF) { | |
1458 | s->io.fd = fd; | |
1459 | s->io.registered = false; | |
1460 | } else { | |
1461 | int saved_fd; | |
1462 | ||
1463 | saved_fd = s->io.fd; | |
1464 | assert(s->io.registered); | |
1465 | ||
1466 | s->io.fd = fd; | |
1467 | s->io.registered = false; | |
1468 | ||
1469 | r = source_io_register(s, s->enabled, s->io.events); | |
1470 | if (r < 0) { | |
1471 | s->io.fd = saved_fd; | |
1472 | s->io.registered = true; | |
1473 | return r; | |
1474 | } | |
1475 | ||
1476 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1477 | } | |
1478 | ||
1479 | return 0; | |
1480 | } | |
1481 | ||
f7262a9f | 1482 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1483 | assert_return(s, -EINVAL); |
1484 | assert_return(events, -EINVAL); | |
1485 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1486 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1487 | |
1488 | *events = s->io.events; | |
1489 | return 0; | |
1490 | } | |
1491 | ||
f7262a9f | 1492 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1493 | int r; |
1494 | ||
305f78bf LP |
1495 | assert_return(s, -EINVAL); |
1496 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1497 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1498 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1499 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1500 | |
b63c8d4f DH |
1501 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1502 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1503 | return 0; |
1504 | ||
baf76283 | 1505 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1506 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1507 | if (r < 0) |
1508 | return r; | |
1509 | } | |
1510 | ||
1511 | s->io.events = events; | |
503f39c3 | 1512 | source_set_pending(s, false); |
fd38203a LP |
1513 | |
1514 | return 0; | |
1515 | } | |
1516 | ||
f7262a9f | 1517 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1518 | assert_return(s, -EINVAL); |
1519 | assert_return(revents, -EINVAL); | |
1520 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1521 | assert_return(s->pending, -ENODATA); | |
1522 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1523 | |
1524 | *revents = s->io.revents; | |
1525 | return 0; | |
1526 | } | |
1527 | ||
f7262a9f | 1528 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1529 | assert_return(s, -EINVAL); |
1530 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1531 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1532 | |
1533 | return s->signal.sig; | |
1534 | } | |
1535 | ||
31927c16 | 1536 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1537 | assert_return(s, -EINVAL); |
1538 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1539 | |
1540 | return s->priority; | |
1541 | } | |
1542 | ||
31927c16 | 1543 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
9da4cb2b LP |
1544 | int r; |
1545 | ||
305f78bf | 1546 | assert_return(s, -EINVAL); |
da7e457c | 1547 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1548 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1549 | |
1550 | if (s->priority == priority) | |
1551 | return 0; | |
1552 | ||
9da4cb2b LP |
1553 | if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { |
1554 | struct signal_data *old, *d; | |
1555 | ||
1556 | /* Move us from the signalfd belonging to the old | |
1557 | * priority to the signalfd of the new priority */ | |
1558 | ||
1559 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
1560 | ||
1561 | s->priority = priority; | |
1562 | ||
1563 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
1564 | if (r < 0) { | |
1565 | s->priority = old->priority; | |
1566 | return r; | |
1567 | } | |
1568 | ||
1569 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
1570 | } else | |
1571 | s->priority = priority; | |
fd38203a LP |
1572 | |
1573 | if (s->pending) | |
c2ba3ad6 | 1574 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1575 | |
1576 | if (s->prepare) | |
c2ba3ad6 | 1577 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1578 | |
6203e07a LP |
1579 | if (s->type == SOURCE_EXIT) |
1580 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1581 | |
fd38203a LP |
1582 | return 0; |
1583 | } | |
1584 | ||
f7262a9f | 1585 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1586 | assert_return(s, -EINVAL); |
1587 | assert_return(m, -EINVAL); | |
1588 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1589 | |
baf76283 | 1590 | *m = s->enabled; |
fd38203a LP |
1591 | return 0; |
1592 | } | |
1593 | ||
f7262a9f | 1594 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1595 | int r; |
1596 | ||
305f78bf LP |
1597 | assert_return(s, -EINVAL); |
1598 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
305f78bf | 1599 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1600 | |
cc567911 LP |
1601 | /* If we are dead anyway, we are fine with turning off |
1602 | * sources, but everything else needs to fail. */ | |
1603 | if (s->event->state == SD_EVENT_FINISHED) | |
1604 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1605 | ||
baf76283 | 1606 | if (s->enabled == m) |
fd38203a LP |
1607 | return 0; |
1608 | ||
baf76283 | 1609 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1610 | |
1611 | switch (s->type) { | |
1612 | ||
1613 | case SOURCE_IO: | |
366e6411 | 1614 | source_io_unregister(s); |
baf76283 | 1615 | s->enabled = m; |
fd38203a LP |
1616 | break; |
1617 | ||
6a0f1f6d | 1618 | case SOURCE_TIME_REALTIME: |
a8548816 | 1619 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1620 | case SOURCE_TIME_MONOTONIC: |
1621 | case SOURCE_TIME_REALTIME_ALARM: | |
1622 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1623 | struct clock_data *d; | |
fd38203a | 1624 | |
baf76283 | 1625 | s->enabled = m; |
6a0f1f6d LP |
1626 | d = event_get_clock_data(s->event, s->type); |
1627 | assert(d); | |
1628 | ||
1629 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1630 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1631 | d->needs_rearm = true; |
fd38203a | 1632 | break; |
6a0f1f6d | 1633 | } |
fd38203a LP |
1634 | |
1635 | case SOURCE_SIGNAL: | |
baf76283 | 1636 | s->enabled = m; |
4807d2d0 | 1637 | |
9da4cb2b | 1638 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
fd38203a LP |
1639 | break; |
1640 | ||
1641 | case SOURCE_CHILD: | |
baf76283 | 1642 | s->enabled = m; |
fd38203a | 1643 | |
baf76283 LP |
1644 | assert(s->event->n_enabled_child_sources > 0); |
1645 | s->event->n_enabled_child_sources--; | |
fd38203a | 1646 | |
9da4cb2b | 1647 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
fd38203a LP |
1648 | break; |
1649 | ||
6203e07a | 1650 | case SOURCE_EXIT: |
305f78bf | 1651 | s->enabled = m; |
6203e07a | 1652 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1653 | break; |
1654 | ||
1655 | case SOURCE_DEFER: | |
6e9feda3 | 1656 | case SOURCE_POST: |
baf76283 | 1657 | s->enabled = m; |
fd38203a | 1658 | break; |
9d3e3aa5 | 1659 | |
6a0f1f6d | 1660 | default: |
9d3e3aa5 | 1661 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1662 | } |
1663 | ||
1664 | } else { | |
1665 | switch (s->type) { | |
1666 | ||
1667 | case SOURCE_IO: | |
1668 | r = source_io_register(s, m, s->io.events); | |
1669 | if (r < 0) | |
1670 | return r; | |
1671 | ||
baf76283 | 1672 | s->enabled = m; |
fd38203a LP |
1673 | break; |
1674 | ||
6a0f1f6d | 1675 | case SOURCE_TIME_REALTIME: |
a8548816 | 1676 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1677 | case SOURCE_TIME_MONOTONIC: |
1678 | case SOURCE_TIME_REALTIME_ALARM: | |
1679 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1680 | struct clock_data *d; | |
fd38203a | 1681 | |
baf76283 | 1682 | s->enabled = m; |
6a0f1f6d LP |
1683 | d = event_get_clock_data(s->event, s->type); |
1684 | assert(d); | |
1685 | ||
1686 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1687 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1688 | d->needs_rearm = true; |
fd38203a | 1689 | break; |
6a0f1f6d | 1690 | } |
fd38203a LP |
1691 | |
1692 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1693 | |
1694 | s->enabled = m; | |
9da4cb2b LP |
1695 | |
1696 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
1697 | if (r < 0) { | |
1698 | s->enabled = SD_EVENT_OFF; | |
1699 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
1700 | return r; | |
1701 | } | |
1702 | ||
fd38203a LP |
1703 | break; |
1704 | ||
1705 | case SOURCE_CHILD: | |
4807d2d0 | 1706 | |
9da4cb2b | 1707 | if (s->enabled == SD_EVENT_OFF) |
4807d2d0 | 1708 | s->event->n_enabled_child_sources++; |
7a0d4a3d DH |
1709 | |
1710 | s->enabled = m; | |
9da4cb2b | 1711 | |
10edebf6 | 1712 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
9da4cb2b LP |
1713 | if (r < 0) { |
1714 | s->enabled = SD_EVENT_OFF; | |
1715 | s->event->n_enabled_child_sources--; | |
1716 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
1717 | return r; | |
1718 | } | |
1719 | ||
fd38203a LP |
1720 | break; |
1721 | ||
6203e07a | 1722 | case SOURCE_EXIT: |
305f78bf | 1723 | s->enabled = m; |
6203e07a | 1724 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1725 | break; |
1726 | ||
1727 | case SOURCE_DEFER: | |
6e9feda3 | 1728 | case SOURCE_POST: |
baf76283 | 1729 | s->enabled = m; |
fd38203a | 1730 | break; |
9d3e3aa5 | 1731 | |
6a0f1f6d | 1732 | default: |
9d3e3aa5 | 1733 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1734 | } |
1735 | } | |
1736 | ||
1737 | if (s->pending) | |
1738 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1739 | ||
1740 | if (s->prepare) | |
1741 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1742 | ||
1743 | return 0; | |
1744 | } | |
1745 | ||
f7262a9f | 1746 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1747 | assert_return(s, -EINVAL); |
1748 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1749 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1750 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1751 | |
1752 | *usec = s->time.next; | |
1753 | return 0; | |
1754 | } | |
1755 | ||
f7262a9f | 1756 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1757 | struct clock_data *d; |
1758 | ||
305f78bf | 1759 | assert_return(s, -EINVAL); |
6a0f1f6d | 1760 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1761 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1762 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1763 | |
fd38203a | 1764 | s->time.next = usec; |
2576a19e | 1765 | |
0cc1125a | 1766 | source_set_pending(s, false); |
fd38203a | 1767 | |
6a0f1f6d LP |
1768 | d = event_get_clock_data(s->event, s->type); |
1769 | assert(d); | |
1770 | ||
1771 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1772 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1773 | d->needs_rearm = true; |
fd38203a LP |
1774 | |
1775 | return 0; | |
1776 | } | |
1777 | ||
f7262a9f | 1778 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1779 | assert_return(s, -EINVAL); |
1780 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1781 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1782 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1783 | ||
1784 | *usec = s->time.accuracy; | |
1785 | return 0; | |
1786 | } | |
1787 | ||
f7262a9f | 1788 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1789 | struct clock_data *d; |
1790 | ||
305f78bf LP |
1791 | assert_return(s, -EINVAL); |
1792 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1793 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1794 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1795 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1796 | |
1797 | if (usec == 0) | |
1798 | usec = DEFAULT_ACCURACY_USEC; | |
1799 | ||
eaa3cbef LP |
1800 | s->time.accuracy = usec; |
1801 | ||
2576a19e LP |
1802 | source_set_pending(s, false); |
1803 | ||
6a0f1f6d LP |
1804 | d = event_get_clock_data(s->event, s->type); |
1805 | assert(d); | |
1806 | ||
1807 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1808 | d->needs_rearm = true; |
6a0f1f6d LP |
1809 | |
1810 | return 0; | |
1811 | } | |
1812 | ||
1813 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1814 | assert_return(s, -EINVAL); | |
1815 | assert_return(clock, -EINVAL); | |
1816 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1817 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1818 | |
6a0f1f6d | 1819 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1820 | return 0; |
1821 | } | |
1822 | ||
f7262a9f | 1823 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1824 | assert_return(s, -EINVAL); |
1825 | assert_return(pid, -EINVAL); | |
1826 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1827 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1828 | ||
1829 | *pid = s->child.pid; | |
1830 | return 0; | |
1831 | } | |
1832 | ||
718db961 | 1833 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1834 | int r; |
1835 | ||
da7e457c | 1836 | assert_return(s, -EINVAL); |
6203e07a | 1837 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1838 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1839 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1840 | |
1841 | if (s->prepare == callback) | |
1842 | return 0; | |
1843 | ||
1844 | if (callback && s->prepare) { | |
1845 | s->prepare = callback; | |
1846 | return 0; | |
1847 | } | |
1848 | ||
1849 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1850 | if (r < 0) | |
1851 | return r; | |
1852 | ||
1853 | s->prepare = callback; | |
1854 | ||
1855 | if (callback) { | |
1856 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1857 | if (r < 0) | |
1858 | return r; | |
1859 | } else | |
1860 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1861 | ||
1862 | return 0; | |
1863 | } | |
1864 | ||
f7262a9f | 1865 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1866 | assert_return(s, NULL); |
fd38203a LP |
1867 | |
1868 | return s->userdata; | |
1869 | } | |
1870 | ||
8f726607 LP |
1871 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1872 | void *ret; | |
1873 | ||
1874 | assert_return(s, NULL); | |
1875 | ||
1876 | ret = s->userdata; | |
1877 | s->userdata = userdata; | |
1878 | ||
1879 | return ret; | |
1880 | } | |
1881 | ||
c2ba3ad6 LP |
1882 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1883 | usec_t c; | |
1884 | assert(e); | |
1885 | assert(a <= b); | |
1886 | ||
1887 | if (a <= 0) | |
1888 | return 0; | |
393003e1 LP |
1889 | if (a >= USEC_INFINITY) |
1890 | return USEC_INFINITY; | |
c2ba3ad6 LP |
1891 | |
1892 | if (b <= a + 1) | |
1893 | return a; | |
1894 | ||
52444dc4 LP |
1895 | initialize_perturb(e); |
1896 | ||
c2ba3ad6 LP |
1897 | /* |
1898 | Find a good time to wake up again between times a and b. We | |
1899 | have two goals here: | |
1900 | ||
1901 | a) We want to wake up as seldom as possible, hence prefer | |
1902 | later times over earlier times. | |
1903 | ||
1904 | b) But if we have to wake up, then let's make sure to | |
1905 | dispatch as much as possible on the entire system. | |
1906 | ||
1907 | We implement this by waking up everywhere at the same time | |
850516e0 | 1908 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1909 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1910 | then we try to find the same spot in every 10s, then 1s and |
1911 | then 250ms step. Otherwise, we pick the last possible time | |
1912 | to wake up. | |
c2ba3ad6 LP |
1913 | */ |
1914 | ||
850516e0 LP |
1915 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1916 | if (c >= b) { | |
1917 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1918 | return b; | |
1919 | ||
1920 | c -= USEC_PER_MINUTE; | |
1921 | } | |
1922 | ||
ba276c81 LP |
1923 | if (c >= a) |
1924 | return c; | |
1925 | ||
1926 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1927 | if (c >= b) { | |
1928 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1929 | return b; | |
1930 | ||
1931 | c -= USEC_PER_SEC*10; | |
1932 | } | |
1933 | ||
850516e0 LP |
1934 | if (c >= a) |
1935 | return c; | |
1936 | ||
1937 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1938 | if (c >= b) { |
1939 | if (_unlikely_(c < USEC_PER_SEC)) | |
1940 | return b; | |
1941 | ||
1942 | c -= USEC_PER_SEC; | |
1943 | } | |
1944 | ||
1945 | if (c >= a) | |
1946 | return c; | |
1947 | ||
1948 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1949 | if (c >= b) { | |
1950 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1951 | return b; | |
1952 | ||
1953 | c -= USEC_PER_MSEC*250; | |
1954 | } | |
1955 | ||
1956 | if (c >= a) | |
1957 | return c; | |
1958 | ||
1959 | return b; | |
1960 | } | |
1961 | ||
fd38203a LP |
1962 | static int event_arm_timer( |
1963 | sd_event *e, | |
6a0f1f6d | 1964 | struct clock_data *d) { |
fd38203a LP |
1965 | |
1966 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1967 | sd_event_source *a, *b; |
1968 | usec_t t; | |
fd38203a LP |
1969 | int r; |
1970 | ||
cde93897 | 1971 | assert(e); |
6a0f1f6d | 1972 | assert(d); |
fd38203a | 1973 | |
d06441da | 1974 | if (!d->needs_rearm) |
212bbb17 TG |
1975 | return 0; |
1976 | else | |
1977 | d->needs_rearm = false; | |
1978 | ||
6a0f1f6d | 1979 | a = prioq_peek(d->earliest); |
393003e1 | 1980 | if (!a || a->enabled == SD_EVENT_OFF || a->time.next == USEC_INFINITY) { |
72aedc1e | 1981 | |
6a0f1f6d | 1982 | if (d->fd < 0) |
c57b5ca3 LP |
1983 | return 0; |
1984 | ||
3a43da28 | 1985 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
1986 | return 0; |
1987 | ||
1988 | /* disarm */ | |
6a0f1f6d | 1989 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1990 | if (r < 0) |
1991 | return r; | |
1992 | ||
3a43da28 | 1993 | d->next = USEC_INFINITY; |
fd38203a | 1994 | return 0; |
72aedc1e | 1995 | } |
fd38203a | 1996 | |
6a0f1f6d | 1997 | b = prioq_peek(d->latest); |
baf76283 | 1998 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 | 1999 | |
1bce0ffa | 2000 | t = sleep_between(e, a->time.next, time_event_source_latest(b)); |
6a0f1f6d | 2001 | if (d->next == t) |
fd38203a LP |
2002 | return 0; |
2003 | ||
6a0f1f6d | 2004 | assert_se(d->fd >= 0); |
fd38203a | 2005 | |
c2ba3ad6 | 2006 | if (t == 0) { |
fd38203a LP |
2007 | /* We don' want to disarm here, just mean some time looooong ago. */ |
2008 | its.it_value.tv_sec = 0; | |
2009 | its.it_value.tv_nsec = 1; | |
2010 | } else | |
c2ba3ad6 | 2011 | timespec_store(&its.it_value, t); |
fd38203a | 2012 | |
6a0f1f6d | 2013 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 2014 | if (r < 0) |
cde93897 | 2015 | return -errno; |
fd38203a | 2016 | |
6a0f1f6d | 2017 | d->next = t; |
fd38203a LP |
2018 | return 0; |
2019 | } | |
2020 | ||
9a800b56 | 2021 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
2022 | assert(e); |
2023 | assert(s); | |
2024 | assert(s->type == SOURCE_IO); | |
2025 | ||
9a800b56 LP |
2026 | /* If the event source was already pending, we just OR in the |
2027 | * new revents, otherwise we reset the value. The ORing is | |
2028 | * necessary to handle EPOLLONESHOT events properly where | |
2029 | * readability might happen independently of writability, and | |
2030 | * we need to keep track of both */ | |
2031 | ||
2032 | if (s->pending) | |
2033 | s->io.revents |= revents; | |
2034 | else | |
2035 | s->io.revents = revents; | |
fd38203a | 2036 | |
fd38203a LP |
2037 | return source_set_pending(s, true); |
2038 | } | |
2039 | ||
72aedc1e | 2040 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2041 | uint64_t x; |
2042 | ssize_t ss; | |
2043 | ||
2044 | assert(e); | |
da7e457c | 2045 | assert(fd >= 0); |
72aedc1e | 2046 | |
305f78bf | 2047 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2048 | |
2049 | ss = read(fd, &x, sizeof(x)); | |
2050 | if (ss < 0) { | |
2051 | if (errno == EAGAIN || errno == EINTR) | |
2052 | return 0; | |
2053 | ||
2054 | return -errno; | |
2055 | } | |
2056 | ||
8d35dae7 | 2057 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2058 | return -EIO; |
2059 | ||
cde93897 | 2060 | if (next) |
3a43da28 | 2061 | *next = USEC_INFINITY; |
72aedc1e | 2062 | |
fd38203a LP |
2063 | return 0; |
2064 | } | |
2065 | ||
305f78bf LP |
2066 | static int process_timer( |
2067 | sd_event *e, | |
2068 | usec_t n, | |
6a0f1f6d | 2069 | struct clock_data *d) { |
305f78bf | 2070 | |
fd38203a LP |
2071 | sd_event_source *s; |
2072 | int r; | |
2073 | ||
2074 | assert(e); | |
6a0f1f6d | 2075 | assert(d); |
fd38203a LP |
2076 | |
2077 | for (;;) { | |
6a0f1f6d | 2078 | s = prioq_peek(d->earliest); |
fd38203a LP |
2079 | if (!s || |
2080 | s->time.next > n || | |
baf76283 | 2081 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2082 | s->pending) |
2083 | break; | |
2084 | ||
2085 | r = source_set_pending(s, true); | |
2086 | if (r < 0) | |
2087 | return r; | |
2088 | ||
6a0f1f6d LP |
2089 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2090 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 2091 | d->needs_rearm = true; |
fd38203a LP |
2092 | } |
2093 | ||
2094 | return 0; | |
2095 | } | |
2096 | ||
2097 | static int process_child(sd_event *e) { | |
2098 | sd_event_source *s; | |
2099 | Iterator i; | |
2100 | int r; | |
2101 | ||
2102 | assert(e); | |
2103 | ||
c2ba3ad6 LP |
2104 | e->need_process_child = false; |
2105 | ||
fd38203a LP |
2106 | /* |
2107 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2108 | + WNOHANG for each PID we wait for, instead of using | |
2109 | P_ALL. This is because we only want to get child | |
2110 | information of very specific child processes, and not all | |
2111 | of them. We might not have processed the SIGCHLD even of a | |
2112 | previous invocation and we don't want to maintain a | |
2113 | unbounded *per-child* event queue, hence we really don't | |
2114 | want anything flushed out of the kernel's queue that we | |
2115 | don't care about. Since this is O(n) this means that if you | |
2116 | have a lot of processes you probably want to handle SIGCHLD | |
2117 | yourself. | |
08cd1552 LP |
2118 | |
2119 | We do not reap the children here (by using WNOWAIT), this | |
2120 | is only done after the event source is dispatched so that | |
2121 | the callback still sees the process as a zombie. | |
fd38203a LP |
2122 | */ |
2123 | ||
2124 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2125 | assert(s->type == SOURCE_CHILD); | |
2126 | ||
2127 | if (s->pending) | |
2128 | continue; | |
2129 | ||
baf76283 | 2130 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2131 | continue; |
2132 | ||
2133 | zero(s->child.siginfo); | |
08cd1552 LP |
2134 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2135 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
2136 | if (r < 0) |
2137 | return -errno; | |
2138 | ||
2139 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
2140 | bool zombie = |
2141 | s->child.siginfo.si_code == CLD_EXITED || | |
2142 | s->child.siginfo.si_code == CLD_KILLED || | |
2143 | s->child.siginfo.si_code == CLD_DUMPED; | |
2144 | ||
2145 | if (!zombie && (s->child.options & WEXITED)) { | |
2146 | /* If the child isn't dead then let's | |
2147 | * immediately remove the state change | |
2148 | * from the queue, since there's no | |
2149 | * benefit in leaving it queued */ | |
2150 | ||
2151 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2152 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2153 | } | |
2154 | ||
fd38203a LP |
2155 | r = source_set_pending(s, true); |
2156 | if (r < 0) | |
2157 | return r; | |
2158 | } | |
2159 | } | |
2160 | ||
fd38203a LP |
2161 | return 0; |
2162 | } | |
2163 | ||
9da4cb2b | 2164 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2165 | bool read_one = false; |
fd38203a LP |
2166 | int r; |
2167 | ||
da7e457c | 2168 | assert(e); |
305f78bf | 2169 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2170 | |
9da4cb2b LP |
2171 | /* If there's a signal queued on this priority and SIGCHLD is |
2172 | on this priority too, then make sure to recheck the | |
2173 | children we watch. This is because we only ever dequeue | |
2174 | the first signal per priority, and if we dequeue one, and | |
2175 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2176 | might have higher priority children we care about hence we | |
2177 | need to check that explicitly. */ | |
2178 | ||
2179 | if (sigismember(&d->sigset, SIGCHLD)) | |
2180 | e->need_process_child = true; | |
2181 | ||
2182 | /* If there's already an event source pending for this | |
2183 | * priority we don't read another */ | |
2184 | if (d->current) | |
2185 | return 0; | |
2186 | ||
fd38203a | 2187 | for (;;) { |
0eb2e0e3 | 2188 | struct signalfd_siginfo si; |
7057bd99 | 2189 | ssize_t n; |
92daebc0 | 2190 | sd_event_source *s = NULL; |
fd38203a | 2191 | |
9da4cb2b | 2192 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 2193 | if (n < 0) { |
fd38203a LP |
2194 | if (errno == EAGAIN || errno == EINTR) |
2195 | return read_one; | |
2196 | ||
2197 | return -errno; | |
2198 | } | |
2199 | ||
7057bd99 | 2200 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2201 | return -EIO; |
2202 | ||
7057bd99 ZJS |
2203 | assert(si.ssi_signo < _NSIG); |
2204 | ||
fd38203a LP |
2205 | read_one = true; |
2206 | ||
92daebc0 LP |
2207 | if (e->signal_sources) |
2208 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
2209 | if (!s) |
2210 | continue; | |
9da4cb2b LP |
2211 | if (s->pending) |
2212 | continue; | |
fd38203a LP |
2213 | |
2214 | s->signal.siginfo = si; | |
9da4cb2b LP |
2215 | d->current = s; |
2216 | ||
fd38203a LP |
2217 | r = source_set_pending(s, true); |
2218 | if (r < 0) | |
2219 | return r; | |
9da4cb2b LP |
2220 | |
2221 | return 1; | |
fd38203a | 2222 | } |
fd38203a LP |
2223 | } |
2224 | ||
2225 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 2226 | int r = 0; |
fd38203a LP |
2227 | |
2228 | assert(s); | |
6203e07a | 2229 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2230 | |
6203e07a | 2231 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
2232 | r = source_set_pending(s, false); |
2233 | if (r < 0) | |
2234 | return r; | |
2235 | } | |
fd38203a | 2236 | |
6e9feda3 LP |
2237 | if (s->type != SOURCE_POST) { |
2238 | sd_event_source *z; | |
2239 | Iterator i; | |
2240 | ||
2241 | /* If we execute a non-post source, let's mark all | |
2242 | * post sources as pending */ | |
2243 | ||
2244 | SET_FOREACH(z, s->event->post_sources, i) { | |
2245 | if (z->enabled == SD_EVENT_OFF) | |
2246 | continue; | |
2247 | ||
2248 | r = source_set_pending(z, true); | |
2249 | if (r < 0) | |
2250 | return r; | |
2251 | } | |
2252 | } | |
2253 | ||
baf76283 LP |
2254 | if (s->enabled == SD_EVENT_ONESHOT) { |
2255 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2256 | if (r < 0) |
2257 | return r; | |
2258 | } | |
2259 | ||
12179984 | 2260 | s->dispatching = true; |
b7484e2a | 2261 | |
fd38203a LP |
2262 | switch (s->type) { |
2263 | ||
2264 | case SOURCE_IO: | |
2265 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2266 | break; | |
2267 | ||
6a0f1f6d | 2268 | case SOURCE_TIME_REALTIME: |
a8548816 | 2269 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2270 | case SOURCE_TIME_MONOTONIC: |
2271 | case SOURCE_TIME_REALTIME_ALARM: | |
2272 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2273 | r = s->time.callback(s, s->time.next, s->userdata); |
2274 | break; | |
2275 | ||
2276 | case SOURCE_SIGNAL: | |
2277 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2278 | break; | |
2279 | ||
08cd1552 LP |
2280 | case SOURCE_CHILD: { |
2281 | bool zombie; | |
2282 | ||
2283 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
2284 | s->child.siginfo.si_code == CLD_KILLED || | |
2285 | s->child.siginfo.si_code == CLD_DUMPED; | |
2286 | ||
fd38203a | 2287 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2288 | |
2289 | /* Now, reap the PID for good. */ | |
2290 | if (zombie) | |
2291 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2292 | ||
fd38203a | 2293 | break; |
08cd1552 | 2294 | } |
fd38203a LP |
2295 | |
2296 | case SOURCE_DEFER: | |
2297 | r = s->defer.callback(s, s->userdata); | |
2298 | break; | |
da7e457c | 2299 | |
6e9feda3 LP |
2300 | case SOURCE_POST: |
2301 | r = s->post.callback(s, s->userdata); | |
2302 | break; | |
2303 | ||
6203e07a LP |
2304 | case SOURCE_EXIT: |
2305 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2306 | break; |
9d3e3aa5 LP |
2307 | |
2308 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2309 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2310 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2311 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2312 | } |
2313 | ||
12179984 LP |
2314 | s->dispatching = false; |
2315 | ||
55cbfaa5 DM |
2316 | if (r < 0) |
2317 | log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m", | |
2318 | strna(s->description), event_source_type_to_string(s->type)); | |
12179984 LP |
2319 | |
2320 | if (s->n_ref == 0) | |
2321 | source_free(s); | |
2322 | else if (r < 0) | |
6203e07a | 2323 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2324 | |
6203e07a | 2325 | return 1; |
fd38203a LP |
2326 | } |
2327 | ||
2328 | static int event_prepare(sd_event *e) { | |
2329 | int r; | |
2330 | ||
2331 | assert(e); | |
2332 | ||
2333 | for (;;) { | |
2334 | sd_event_source *s; | |
2335 | ||
2336 | s = prioq_peek(e->prepare); | |
baf76283 | 2337 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2338 | break; |
2339 | ||
2340 | s->prepare_iteration = e->iteration; | |
2341 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2342 | if (r < 0) | |
2343 | return r; | |
2344 | ||
2345 | assert(s->prepare); | |
12179984 LP |
2346 | |
2347 | s->dispatching = true; | |
fd38203a | 2348 | r = s->prepare(s, s->userdata); |
12179984 LP |
2349 | s->dispatching = false; |
2350 | ||
55cbfaa5 DM |
2351 | if (r < 0) |
2352 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m", | |
2353 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a | 2354 | |
12179984 LP |
2355 | if (s->n_ref == 0) |
2356 | source_free(s); | |
2357 | else if (r < 0) | |
2358 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2359 | } |
2360 | ||
2361 | return 0; | |
2362 | } | |
2363 | ||
6203e07a | 2364 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2365 | sd_event_source *p; |
2366 | int r; | |
2367 | ||
2368 | assert(e); | |
2369 | ||
6203e07a | 2370 | p = prioq_peek(e->exit); |
baf76283 | 2371 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2372 | e->state = SD_EVENT_FINISHED; |
2373 | return 0; | |
2374 | } | |
2375 | ||
2376 | sd_event_ref(e); | |
2377 | e->iteration++; | |
6203e07a | 2378 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2379 | |
2380 | r = source_dispatch(p); | |
2381 | ||
2b0c9ef7 | 2382 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2383 | sd_event_unref(e); |
2384 | ||
2385 | return r; | |
2386 | } | |
2387 | ||
c2ba3ad6 LP |
2388 | static sd_event_source* event_next_pending(sd_event *e) { |
2389 | sd_event_source *p; | |
2390 | ||
da7e457c LP |
2391 | assert(e); |
2392 | ||
c2ba3ad6 LP |
2393 | p = prioq_peek(e->pending); |
2394 | if (!p) | |
2395 | return NULL; | |
2396 | ||
baf76283 | 2397 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2398 | return NULL; |
2399 | ||
2400 | return p; | |
2401 | } | |
2402 | ||
cde93897 LP |
2403 | static int arm_watchdog(sd_event *e) { |
2404 | struct itimerspec its = {}; | |
2405 | usec_t t; | |
2406 | int r; | |
2407 | ||
2408 | assert(e); | |
2409 | assert(e->watchdog_fd >= 0); | |
2410 | ||
2411 | t = sleep_between(e, | |
2412 | e->watchdog_last + (e->watchdog_period / 2), | |
2413 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2414 | ||
2415 | timespec_store(&its.it_value, t); | |
2416 | ||
75145780 LP |
2417 | /* Make sure we never set the watchdog to 0, which tells the |
2418 | * kernel to disable it. */ | |
2419 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2420 | its.it_value.tv_nsec = 1; | |
2421 | ||
cde93897 LP |
2422 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2423 | if (r < 0) | |
2424 | return -errno; | |
2425 | ||
2426 | return 0; | |
2427 | } | |
2428 | ||
2429 | static int process_watchdog(sd_event *e) { | |
2430 | assert(e); | |
2431 | ||
2432 | if (!e->watchdog) | |
2433 | return 0; | |
2434 | ||
2435 | /* Don't notify watchdog too often */ | |
2436 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2437 | return 0; | |
2438 | ||
2439 | sd_notify(false, "WATCHDOG=1"); | |
2440 | e->watchdog_last = e->timestamp.monotonic; | |
2441 | ||
2442 | return arm_watchdog(e); | |
2443 | } | |
2444 | ||
c45a5a74 TG |
2445 | _public_ int sd_event_prepare(sd_event *e) { |
2446 | int r; | |
fd38203a | 2447 | |
da7e457c LP |
2448 | assert_return(e, -EINVAL); |
2449 | assert_return(!event_pid_changed(e), -ECHILD); | |
2450 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2451 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 2452 | |
6203e07a | 2453 | if (e->exit_requested) |
c45a5a74 | 2454 | goto pending; |
fd38203a LP |
2455 | |
2456 | e->iteration++; | |
2457 | ||
0be6c2f6 | 2458 | e->state = SD_EVENT_PREPARING; |
fd38203a | 2459 | r = event_prepare(e); |
0be6c2f6 | 2460 | e->state = SD_EVENT_INITIAL; |
fd38203a | 2461 | if (r < 0) |
c45a5a74 | 2462 | return r; |
fd38203a | 2463 | |
6a0f1f6d LP |
2464 | r = event_arm_timer(e, &e->realtime); |
2465 | if (r < 0) | |
c45a5a74 | 2466 | return r; |
6a0f1f6d | 2467 | |
a8548816 TG |
2468 | r = event_arm_timer(e, &e->boottime); |
2469 | if (r < 0) | |
c45a5a74 | 2470 | return r; |
a8548816 | 2471 | |
6a0f1f6d LP |
2472 | r = event_arm_timer(e, &e->monotonic); |
2473 | if (r < 0) | |
c45a5a74 | 2474 | return r; |
6a0f1f6d LP |
2475 | |
2476 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 2477 | if (r < 0) |
c45a5a74 | 2478 | return r; |
fd38203a | 2479 | |
6a0f1f6d | 2480 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 2481 | if (r < 0) |
c45a5a74 | 2482 | return r; |
fd38203a | 2483 | |
1b5995b0 | 2484 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
2485 | goto pending; |
2486 | ||
2b0c9ef7 | 2487 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
2488 | |
2489 | return 0; | |
2490 | ||
2491 | pending: | |
2b0c9ef7 | 2492 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2493 | r = sd_event_wait(e, 0); |
2494 | if (r == 0) | |
2b0c9ef7 | 2495 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2496 | |
2497 | return r; | |
c45a5a74 TG |
2498 | } |
2499 | ||
2500 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2501 | struct epoll_event *ev_queue; | |
2502 | unsigned ev_queue_max; | |
2503 | int r, m, i; | |
2504 | ||
2505 | assert_return(e, -EINVAL); | |
2506 | assert_return(!event_pid_changed(e), -ECHILD); | |
2507 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2508 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
2509 | |
2510 | if (e->exit_requested) { | |
2511 | e->state = SD_EVENT_PENDING; | |
2512 | return 1; | |
2513 | } | |
6a0f1f6d | 2514 | |
1c724e9e | 2515 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 2516 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 2517 | |
15b38f93 | 2518 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2519 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2520 | if (m < 0) { |
c45a5a74 TG |
2521 | if (errno == EINTR) { |
2522 | e->state = SD_EVENT_PENDING; | |
2523 | return 1; | |
2524 | } | |
2525 | ||
2526 | r = -errno; | |
da7e457c LP |
2527 | goto finish; |
2528 | } | |
fd38203a | 2529 | |
46e8c825 | 2530 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2531 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2532 | |
2533 | for (i = 0; i < m; i++) { | |
2534 | ||
9da4cb2b | 2535 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2536 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
9da4cb2b LP |
2537 | else { |
2538 | WakeupType *t = ev_queue[i].data.ptr; | |
2539 | ||
2540 | switch (*t) { | |
2541 | ||
2542 | case WAKEUP_EVENT_SOURCE: | |
2543 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2544 | break; | |
fd38203a | 2545 | |
9da4cb2b LP |
2546 | case WAKEUP_CLOCK_DATA: { |
2547 | struct clock_data *d = ev_queue[i].data.ptr; | |
2548 | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); | |
2549 | break; | |
2550 | } | |
2551 | ||
2552 | case WAKEUP_SIGNAL_DATA: | |
2553 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2554 | break; | |
2555 | ||
2556 | default: | |
2557 | assert_not_reached("Invalid wake-up pointer"); | |
2558 | } | |
2559 | } | |
fd38203a | 2560 | if (r < 0) |
da7e457c | 2561 | goto finish; |
fd38203a LP |
2562 | } |
2563 | ||
cde93897 LP |
2564 | r = process_watchdog(e); |
2565 | if (r < 0) | |
2566 | goto finish; | |
2567 | ||
6a0f1f6d LP |
2568 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2569 | if (r < 0) | |
2570 | goto finish; | |
2571 | ||
a8548816 TG |
2572 | r = process_timer(e, e->timestamp_boottime, &e->boottime); |
2573 | if (r < 0) | |
2574 | goto finish; | |
2575 | ||
6a0f1f6d LP |
2576 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2577 | if (r < 0) | |
2578 | goto finish; | |
2579 | ||
2580 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2581 | if (r < 0) |
da7e457c | 2582 | goto finish; |
fd38203a | 2583 | |
6a0f1f6d | 2584 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2585 | if (r < 0) |
da7e457c | 2586 | goto finish; |
fd38203a | 2587 | |
c2ba3ad6 | 2588 | if (e->need_process_child) { |
fd38203a LP |
2589 | r = process_child(e); |
2590 | if (r < 0) | |
da7e457c | 2591 | goto finish; |
fd38203a LP |
2592 | } |
2593 | ||
c45a5a74 TG |
2594 | if (event_next_pending(e)) { |
2595 | e->state = SD_EVENT_PENDING; | |
2596 | ||
2597 | return 1; | |
da7e457c LP |
2598 | } |
2599 | ||
c45a5a74 | 2600 | r = 0; |
fd38203a | 2601 | |
da7e457c | 2602 | finish: |
2b0c9ef7 | 2603 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2604 | |
2605 | return r; | |
fd38203a LP |
2606 | } |
2607 | ||
c45a5a74 TG |
2608 | _public_ int sd_event_dispatch(sd_event *e) { |
2609 | sd_event_source *p; | |
2610 | int r; | |
2611 | ||
2612 | assert_return(e, -EINVAL); | |
2613 | assert_return(!event_pid_changed(e), -ECHILD); | |
2614 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2615 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
2616 | ||
2617 | if (e->exit_requested) | |
2618 | return dispatch_exit(e); | |
2619 | ||
2620 | p = event_next_pending(e); | |
2621 | if (p) { | |
2622 | sd_event_ref(e); | |
2623 | ||
2624 | e->state = SD_EVENT_RUNNING; | |
2625 | r = source_dispatch(p); | |
2b0c9ef7 | 2626 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2627 | |
2628 | sd_event_unref(e); | |
2629 | ||
2630 | return r; | |
2631 | } | |
2632 | ||
2b0c9ef7 | 2633 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2634 | |
2635 | return 1; | |
2636 | } | |
2637 | ||
34b87517 VC |
2638 | static void event_log_delays(sd_event *e) { |
2639 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1]; | |
34a6843d VC |
2640 | unsigned i; |
2641 | int o; | |
34b87517 VC |
2642 | |
2643 | for (i = o = 0; i < ELEMENTSOF(e->delays); i++) { | |
2644 | o += snprintf(&b[o], sizeof(b) - o, "%u ", e->delays[i]); | |
2645 | e->delays[i] = 0; | |
2646 | } | |
34a6843d | 2647 | log_debug("Event loop iterations: %.*s", o, b); |
34b87517 VC |
2648 | } |
2649 | ||
c45a5a74 TG |
2650 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
2651 | int r; | |
2652 | ||
2653 | assert_return(e, -EINVAL); | |
2654 | assert_return(!event_pid_changed(e), -ECHILD); | |
2655 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2656 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 | 2657 | |
34b87517 VC |
2658 | if (e->profile_delays && e->last_run) { |
2659 | usec_t this_run; | |
2660 | unsigned l; | |
2661 | ||
2662 | this_run = now(CLOCK_MONOTONIC); | |
2663 | ||
2664 | l = u64log2(this_run - e->last_run); | |
2665 | assert(l < sizeof(e->delays)); | |
2666 | e->delays[l]++; | |
2667 | ||
2668 | if (this_run - e->last_log >= 5*USEC_PER_SEC) { | |
2669 | event_log_delays(e); | |
2670 | e->last_log = this_run; | |
2671 | } | |
2672 | } | |
2673 | ||
c45a5a74 | 2674 | r = sd_event_prepare(e); |
53bac4e0 LP |
2675 | if (r == 0) |
2676 | /* There was nothing? Then wait... */ | |
2677 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 2678 | |
34b87517 VC |
2679 | if (e->profile_delays) |
2680 | e->last_run = now(CLOCK_MONOTONIC); | |
2681 | ||
02d30981 | 2682 | if (r > 0) { |
53bac4e0 | 2683 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
2684 | r = sd_event_dispatch(e); |
2685 | if (r < 0) | |
2686 | return r; | |
53bac4e0 LP |
2687 | |
2688 | return 1; | |
2689 | } | |
2690 | ||
2691 | return r; | |
c45a5a74 TG |
2692 | } |
2693 | ||
f7262a9f | 2694 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2695 | int r; |
2696 | ||
da7e457c LP |
2697 | assert_return(e, -EINVAL); |
2698 | assert_return(!event_pid_changed(e), -ECHILD); | |
2b0c9ef7 | 2699 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c LP |
2700 | |
2701 | sd_event_ref(e); | |
fd38203a | 2702 | |
da7e457c | 2703 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2704 | r = sd_event_run(e, (uint64_t) -1); |
2705 | if (r < 0) | |
da7e457c | 2706 | goto finish; |
fd38203a LP |
2707 | } |
2708 | ||
6203e07a | 2709 | r = e->exit_code; |
da7e457c LP |
2710 | |
2711 | finish: | |
2712 | sd_event_unref(e); | |
2713 | return r; | |
fd38203a LP |
2714 | } |
2715 | ||
9b364545 TG |
2716 | _public_ int sd_event_get_fd(sd_event *e) { |
2717 | ||
2718 | assert_return(e, -EINVAL); | |
2719 | assert_return(!event_pid_changed(e), -ECHILD); | |
2720 | ||
2721 | return e->epoll_fd; | |
2722 | } | |
2723 | ||
f7262a9f | 2724 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2725 | assert_return(e, -EINVAL); |
2726 | assert_return(!event_pid_changed(e), -ECHILD); | |
2727 | ||
2728 | return e->state; | |
2729 | } | |
2730 | ||
6203e07a | 2731 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2732 | assert_return(e, -EINVAL); |
6203e07a | 2733 | assert_return(code, -EINVAL); |
da7e457c | 2734 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2735 | |
6203e07a LP |
2736 | if (!e->exit_requested) |
2737 | return -ENODATA; | |
2738 | ||
2739 | *code = e->exit_code; | |
2740 | return 0; | |
fd38203a LP |
2741 | } |
2742 | ||
6203e07a | 2743 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2744 | assert_return(e, -EINVAL); |
2745 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2746 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2747 | |
6203e07a LP |
2748 | e->exit_requested = true; |
2749 | e->exit_code = code; | |
2750 | ||
fd38203a LP |
2751 | return 0; |
2752 | } | |
46e8c825 | 2753 | |
6a0f1f6d | 2754 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2755 | assert_return(e, -EINVAL); |
2756 | assert_return(usec, -EINVAL); | |
46e8c825 | 2757 | assert_return(!event_pid_changed(e), -ECHILD); |
2c86ba5a ZJS |
2758 | assert_return(IN_SET(clock, |
2759 | CLOCK_REALTIME, | |
2760 | CLOCK_REALTIME_ALARM, | |
2761 | CLOCK_MONOTONIC, | |
2762 | CLOCK_BOOTTIME, | |
2763 | CLOCK_BOOTTIME_ALARM), -EOPNOTSUPP); | |
46e8c825 | 2764 | |
38a03f06 LP |
2765 | if (!dual_timestamp_is_set(&e->timestamp)) { |
2766 | /* Implicitly fall back to now() if we never ran | |
2767 | * before and thus have no cached time. */ | |
2768 | *usec = now(clock); | |
2769 | return 1; | |
2770 | } | |
46e8c825 | 2771 | |
6a0f1f6d LP |
2772 | switch (clock) { |
2773 | ||
2774 | case CLOCK_REALTIME: | |
2775 | case CLOCK_REALTIME_ALARM: | |
2776 | *usec = e->timestamp.realtime; | |
2777 | break; | |
2778 | ||
2779 | case CLOCK_MONOTONIC: | |
2780 | *usec = e->timestamp.monotonic; | |
2781 | break; | |
2782 | ||
32c1f5a5 LP |
2783 | case CLOCK_BOOTTIME: |
2784 | case CLOCK_BOOTTIME_ALARM: | |
6a0f1f6d LP |
2785 | *usec = e->timestamp_boottime; |
2786 | break; | |
32c1f5a5 LP |
2787 | |
2788 | default: | |
2789 | assert_not_reached("Unknown clock?"); | |
6a0f1f6d | 2790 | } |
46e8c825 | 2791 | |
46e8c825 LP |
2792 | return 0; |
2793 | } | |
afc6adb5 LP |
2794 | |
2795 | _public_ int sd_event_default(sd_event **ret) { | |
2796 | ||
ec202eae | 2797 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2798 | sd_event *e = NULL; |
afc6adb5 LP |
2799 | int r; |
2800 | ||
2801 | if (!ret) | |
2802 | return !!default_event; | |
2803 | ||
2804 | if (default_event) { | |
2805 | *ret = sd_event_ref(default_event); | |
2806 | return 0; | |
2807 | } | |
2808 | ||
2809 | r = sd_event_new(&e); | |
2810 | if (r < 0) | |
2811 | return r; | |
2812 | ||
2813 | e->default_event_ptr = &default_event; | |
2814 | e->tid = gettid(); | |
2815 | default_event = e; | |
2816 | ||
2817 | *ret = e; | |
2818 | return 1; | |
2819 | } | |
2820 | ||
2821 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2822 | assert_return(e, -EINVAL); | |
2823 | assert_return(tid, -EINVAL); | |
76b54375 | 2824 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2825 | |
76b54375 LP |
2826 | if (e->tid != 0) { |
2827 | *tid = e->tid; | |
2828 | return 0; | |
2829 | } | |
2830 | ||
2831 | return -ENXIO; | |
afc6adb5 | 2832 | } |
cde93897 LP |
2833 | |
2834 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2835 | int r; | |
2836 | ||
2837 | assert_return(e, -EINVAL); | |
8f726607 | 2838 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2839 | |
2840 | if (e->watchdog == !!b) | |
2841 | return e->watchdog; | |
2842 | ||
2843 | if (b) { | |
2844 | struct epoll_event ev = {}; | |
cde93897 | 2845 | |
09812eb7 LP |
2846 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2847 | if (r <= 0) | |
cde93897 | 2848 | return r; |
cde93897 LP |
2849 | |
2850 | /* Issue first ping immediately */ | |
2851 | sd_notify(false, "WATCHDOG=1"); | |
2852 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2853 | ||
2854 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2855 | if (e->watchdog_fd < 0) | |
2856 | return -errno; | |
2857 | ||
2858 | r = arm_watchdog(e); | |
2859 | if (r < 0) | |
2860 | goto fail; | |
2861 | ||
2862 | ev.events = EPOLLIN; | |
2863 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2864 | ||
2865 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2866 | if (r < 0) { | |
2867 | r = -errno; | |
2868 | goto fail; | |
2869 | } | |
2870 | ||
2871 | } else { | |
2872 | if (e->watchdog_fd >= 0) { | |
2873 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2874 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2875 | } |
2876 | } | |
2877 | ||
2878 | e->watchdog = !!b; | |
2879 | return e->watchdog; | |
2880 | ||
2881 | fail: | |
03e334a1 | 2882 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2883 | return r; |
2884 | } | |
8f726607 LP |
2885 | |
2886 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2887 | assert_return(e, -EINVAL); | |
2888 | assert_return(!event_pid_changed(e), -ECHILD); | |
2889 | ||
2890 | return e->watchdog; | |
2891 | } |