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60f067b4 JS |
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> | |
60f067b4 | 23 | |
60f067b4 | 24 | #include "sd-daemon.h" |
db2df898 MP |
25 | #include "sd-event.h" |
26 | #include "sd-id128.h" | |
27 | ||
28 | #include "alloc-util.h" | |
29 | #include "fd-util.h" | |
60f067b4 | 30 | #include "hashmap.h" |
db2df898 MP |
31 | #include "list.h" |
32 | #include "macro.h" | |
60f067b4 | 33 | #include "missing.h" |
db2df898 MP |
34 | #include "prioq.h" |
35 | #include "process-util.h" | |
60f067b4 | 36 | #include "set.h" |
86f210e9 | 37 | #include "signal-util.h" |
4c89c718 | 38 | #include "string-table.h" |
db2df898 MP |
39 | #include "string-util.h" |
40 | #include "time-util.h" | |
41 | #include "util.h" | |
60f067b4 | 42 | |
60f067b4 JS |
43 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
44 | ||
45 | typedef enum EventSourceType { | |
46 | SOURCE_IO, | |
47 | SOURCE_TIME_REALTIME, | |
5eef597e | 48 | SOURCE_TIME_BOOTTIME, |
60f067b4 JS |
49 | SOURCE_TIME_MONOTONIC, |
50 | SOURCE_TIME_REALTIME_ALARM, | |
51 | SOURCE_TIME_BOOTTIME_ALARM, | |
52 | SOURCE_SIGNAL, | |
53 | SOURCE_CHILD, | |
54 | SOURCE_DEFER, | |
55 | SOURCE_POST, | |
56 | SOURCE_EXIT, | |
57 | SOURCE_WATCHDOG, | |
58 | _SOURCE_EVENT_SOURCE_TYPE_MAX, | |
59 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 | |
60 | } EventSourceType; | |
61 | ||
4c89c718 MP |
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 | ||
d9dfd233 MP |
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 | ||
5eef597e | 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) |
60f067b4 JS |
91 | |
92 | struct sd_event_source { | |
d9dfd233 MP |
93 | WakeupType wakeup; |
94 | ||
60f067b4 JS |
95 | unsigned n_ref; |
96 | ||
97 | sd_event *event; | |
98 | void *userdata; | |
99 | sd_event_handler_t prepare; | |
100 | ||
f47781d8 | 101 | char *description; |
5eef597e | 102 | |
60f067b4 JS |
103 | EventSourceType type:5; |
104 | int enabled:3; | |
105 | bool pending:1; | |
106 | bool dispatching:1; | |
107 | bool floating:1; | |
108 | ||
109 | int64_t priority; | |
110 | unsigned pending_index; | |
111 | unsigned prepare_index; | |
5a920b42 MP |
112 | uint64_t pending_iteration; |
113 | uint64_t prepare_iteration; | |
60f067b4 JS |
114 | |
115 | LIST_FIELDS(sd_event_source, sources); | |
116 | ||
117 | union { | |
118 | struct { | |
119 | sd_event_io_handler_t callback; | |
120 | int fd; | |
121 | uint32_t events; | |
122 | uint32_t revents; | |
123 | bool registered:1; | |
124 | } io; | |
125 | struct { | |
126 | sd_event_time_handler_t callback; | |
127 | usec_t next, accuracy; | |
128 | unsigned earliest_index; | |
129 | unsigned latest_index; | |
130 | } time; | |
131 | struct { | |
132 | sd_event_signal_handler_t callback; | |
133 | struct signalfd_siginfo siginfo; | |
134 | int sig; | |
135 | } signal; | |
136 | struct { | |
137 | sd_event_child_handler_t callback; | |
138 | siginfo_t siginfo; | |
139 | pid_t pid; | |
140 | int options; | |
141 | } child; | |
142 | struct { | |
143 | sd_event_handler_t callback; | |
144 | } defer; | |
145 | struct { | |
146 | sd_event_handler_t callback; | |
147 | } post; | |
148 | struct { | |
149 | sd_event_handler_t callback; | |
150 | unsigned prioq_index; | |
151 | } exit; | |
152 | }; | |
153 | }; | |
154 | ||
155 | struct clock_data { | |
d9dfd233 | 156 | WakeupType wakeup; |
60f067b4 JS |
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; | |
5eef597e MP |
169 | |
170 | bool needs_rearm:1; | |
60f067b4 JS |
171 | }; |
172 | ||
d9dfd233 MP |
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 | ||
60f067b4 JS |
186 | struct sd_event { |
187 | unsigned n_ref; | |
188 | ||
189 | int epoll_fd; | |
60f067b4 JS |
190 | int watchdog_fd; |
191 | ||
192 | Prioq *pending; | |
193 | Prioq *prepare; | |
194 | ||
5eef597e | 195 | /* timerfd_create() only supports these five clocks so far. We |
60f067b4 JS |
196 | * can add support for more clocks when the kernel learns to |
197 | * deal with them, too. */ | |
198 | struct clock_data realtime; | |
5eef597e | 199 | struct clock_data boottime; |
60f067b4 JS |
200 | struct clock_data monotonic; |
201 | struct clock_data realtime_alarm; | |
202 | struct clock_data boottime_alarm; | |
203 | ||
204 | usec_t perturb; | |
205 | ||
d9dfd233 MP |
206 | sd_event_source **signal_sources; /* indexed by signal number */ |
207 | Hashmap *signal_data; /* indexed by priority */ | |
60f067b4 JS |
208 | |
209 | Hashmap *child_sources; | |
210 | unsigned n_enabled_child_sources; | |
211 | ||
212 | Set *post_sources; | |
213 | ||
214 | Prioq *exit; | |
215 | ||
216 | pid_t original_pid; | |
217 | ||
5a920b42 MP |
218 | uint64_t iteration; |
219 | triple_timestamp timestamp; | |
60f067b4 JS |
220 | int state; |
221 | ||
222 | bool exit_requested:1; | |
223 | bool need_process_child:1; | |
224 | bool watchdog:1; | |
4c89c718 | 225 | bool profile_delays:1; |
60f067b4 JS |
226 | |
227 | int exit_code; | |
228 | ||
229 | pid_t tid; | |
230 | sd_event **default_event_ptr; | |
231 | ||
232 | usec_t watchdog_last, watchdog_period; | |
233 | ||
234 | unsigned n_sources; | |
235 | ||
236 | LIST_HEAD(sd_event_source, sources); | |
4c89c718 MP |
237 | |
238 | usec_t last_run, last_log; | |
239 | unsigned delays[sizeof(usec_t) * 8]; | |
60f067b4 JS |
240 | }; |
241 | ||
242 | static void source_disconnect(sd_event_source *s); | |
243 | ||
244 | static int pending_prioq_compare(const void *a, const void *b) { | |
245 | const sd_event_source *x = a, *y = b; | |
246 | ||
247 | assert(x->pending); | |
248 | assert(y->pending); | |
249 | ||
250 | /* Enabled ones first */ | |
251 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
252 | return -1; | |
253 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
254 | return 1; | |
255 | ||
256 | /* Lower priority values first */ | |
257 | if (x->priority < y->priority) | |
258 | return -1; | |
259 | if (x->priority > y->priority) | |
260 | return 1; | |
261 | ||
262 | /* Older entries first */ | |
263 | if (x->pending_iteration < y->pending_iteration) | |
264 | return -1; | |
265 | if (x->pending_iteration > y->pending_iteration) | |
266 | return 1; | |
267 | ||
60f067b4 JS |
268 | return 0; |
269 | } | |
270 | ||
271 | static int prepare_prioq_compare(const void *a, const void *b) { | |
272 | const sd_event_source *x = a, *y = b; | |
273 | ||
274 | assert(x->prepare); | |
275 | assert(y->prepare); | |
276 | ||
6300502b MP |
277 | /* Enabled ones first */ |
278 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
279 | return -1; | |
280 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
281 | return 1; | |
282 | ||
60f067b4 JS |
283 | /* Move most recently prepared ones last, so that we can stop |
284 | * preparing as soon as we hit one that has already been | |
285 | * prepared in the current iteration */ | |
286 | if (x->prepare_iteration < y->prepare_iteration) | |
287 | return -1; | |
288 | if (x->prepare_iteration > y->prepare_iteration) | |
289 | return 1; | |
290 | ||
60f067b4 JS |
291 | /* Lower priority values first */ |
292 | if (x->priority < y->priority) | |
293 | return -1; | |
294 | if (x->priority > y->priority) | |
295 | return 1; | |
296 | ||
60f067b4 JS |
297 | return 0; |
298 | } | |
299 | ||
300 | static int earliest_time_prioq_compare(const void *a, const void *b) { | |
301 | const sd_event_source *x = a, *y = b; | |
302 | ||
303 | assert(EVENT_SOURCE_IS_TIME(x->type)); | |
304 | assert(x->type == y->type); | |
305 | ||
306 | /* Enabled ones first */ | |
307 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
308 | return -1; | |
309 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
310 | return 1; | |
311 | ||
312 | /* Move the pending ones to the end */ | |
313 | if (!x->pending && y->pending) | |
314 | return -1; | |
315 | if (x->pending && !y->pending) | |
316 | return 1; | |
317 | ||
318 | /* Order by time */ | |
319 | if (x->time.next < y->time.next) | |
320 | return -1; | |
321 | if (x->time.next > y->time.next) | |
322 | return 1; | |
323 | ||
60f067b4 JS |
324 | return 0; |
325 | } | |
326 | ||
4c89c718 MP |
327 | static usec_t time_event_source_latest(const sd_event_source *s) { |
328 | return usec_add(s->time.next, s->time.accuracy); | |
329 | } | |
330 | ||
60f067b4 JS |
331 | static int latest_time_prioq_compare(const void *a, const void *b) { |
332 | const sd_event_source *x = a, *y = b; | |
333 | ||
334 | assert(EVENT_SOURCE_IS_TIME(x->type)); | |
335 | assert(x->type == y->type); | |
336 | ||
337 | /* Enabled ones first */ | |
338 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
339 | return -1; | |
340 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
341 | return 1; | |
342 | ||
343 | /* Move the pending ones to the end */ | |
344 | if (!x->pending && y->pending) | |
345 | return -1; | |
346 | if (x->pending && !y->pending) | |
347 | return 1; | |
348 | ||
349 | /* Order by time */ | |
4c89c718 | 350 | if (time_event_source_latest(x) < time_event_source_latest(y)) |
60f067b4 | 351 | return -1; |
4c89c718 | 352 | if (time_event_source_latest(x) > time_event_source_latest(y)) |
60f067b4 JS |
353 | return 1; |
354 | ||
60f067b4 JS |
355 | return 0; |
356 | } | |
357 | ||
358 | static int exit_prioq_compare(const void *a, const void *b) { | |
359 | const sd_event_source *x = a, *y = b; | |
360 | ||
361 | assert(x->type == SOURCE_EXIT); | |
362 | assert(y->type == SOURCE_EXIT); | |
363 | ||
364 | /* Enabled ones first */ | |
365 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
366 | return -1; | |
367 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
368 | return 1; | |
369 | ||
370 | /* Lower priority values first */ | |
371 | if (x->priority < y->priority) | |
372 | return -1; | |
373 | if (x->priority > y->priority) | |
374 | return 1; | |
375 | ||
60f067b4 JS |
376 | return 0; |
377 | } | |
378 | ||
379 | static void free_clock_data(struct clock_data *d) { | |
380 | assert(d); | |
d9dfd233 | 381 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
60f067b4 JS |
382 | |
383 | safe_close(d->fd); | |
384 | prioq_free(d->earliest); | |
385 | prioq_free(d->latest); | |
386 | } | |
387 | ||
388 | static void event_free(sd_event *e) { | |
389 | sd_event_source *s; | |
390 | ||
391 | assert(e); | |
392 | ||
393 | while ((s = e->sources)) { | |
394 | assert(s->floating); | |
395 | source_disconnect(s); | |
396 | sd_event_source_unref(s); | |
397 | } | |
398 | ||
399 | assert(e->n_sources == 0); | |
400 | ||
401 | if (e->default_event_ptr) | |
402 | *(e->default_event_ptr) = NULL; | |
403 | ||
404 | safe_close(e->epoll_fd); | |
60f067b4 JS |
405 | safe_close(e->watchdog_fd); |
406 | ||
407 | free_clock_data(&e->realtime); | |
5eef597e | 408 | free_clock_data(&e->boottime); |
60f067b4 JS |
409 | free_clock_data(&e->monotonic); |
410 | free_clock_data(&e->realtime_alarm); | |
411 | free_clock_data(&e->boottime_alarm); | |
412 | ||
413 | prioq_free(e->pending); | |
414 | prioq_free(e->prepare); | |
415 | prioq_free(e->exit); | |
416 | ||
417 | free(e->signal_sources); | |
d9dfd233 | 418 | hashmap_free(e->signal_data); |
60f067b4 JS |
419 | |
420 | hashmap_free(e->child_sources); | |
421 | set_free(e->post_sources); | |
422 | free(e); | |
423 | } | |
424 | ||
425 | _public_ int sd_event_new(sd_event** ret) { | |
426 | sd_event *e; | |
427 | int r; | |
428 | ||
429 | assert_return(ret, -EINVAL); | |
430 | ||
431 | e = new0(sd_event, 1); | |
432 | if (!e) | |
433 | return -ENOMEM; | |
434 | ||
435 | e->n_ref = 1; | |
d9dfd233 | 436 | e->watchdog_fd = e->epoll_fd = e->realtime.fd = e->boottime.fd = e->monotonic.fd = e->realtime_alarm.fd = e->boottime_alarm.fd = -1; |
5eef597e | 437 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
d9dfd233 | 438 | e->realtime.wakeup = e->boottime.wakeup = e->monotonic.wakeup = e->realtime_alarm.wakeup = e->boottime_alarm.wakeup = WAKEUP_CLOCK_DATA; |
60f067b4 | 439 | e->original_pid = getpid(); |
5eef597e | 440 | e->perturb = USEC_INFINITY; |
60f067b4 | 441 | |
4c89c718 MP |
442 | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
443 | if (r < 0) | |
60f067b4 | 444 | goto fail; |
60f067b4 JS |
445 | |
446 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
447 | if (e->epoll_fd < 0) { | |
448 | r = -errno; | |
449 | goto fail; | |
450 | } | |
451 | ||
4c89c718 MP |
452 | if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) { |
453 | 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."); | |
454 | e->profile_delays = true; | |
455 | } | |
456 | ||
60f067b4 JS |
457 | *ret = e; |
458 | return 0; | |
459 | ||
460 | fail: | |
461 | event_free(e); | |
462 | return r; | |
463 | } | |
464 | ||
465 | _public_ sd_event* sd_event_ref(sd_event *e) { | |
4c89c718 MP |
466 | |
467 | if (!e) | |
468 | return NULL; | |
60f067b4 JS |
469 | |
470 | assert(e->n_ref >= 1); | |
471 | e->n_ref++; | |
472 | ||
473 | return e; | |
474 | } | |
475 | ||
476 | _public_ sd_event* sd_event_unref(sd_event *e) { | |
477 | ||
478 | if (!e) | |
479 | return NULL; | |
480 | ||
481 | assert(e->n_ref >= 1); | |
482 | e->n_ref--; | |
483 | ||
484 | if (e->n_ref <= 0) | |
485 | event_free(e); | |
486 | ||
487 | return NULL; | |
488 | } | |
489 | ||
490 | static bool event_pid_changed(sd_event *e) { | |
491 | assert(e); | |
492 | ||
e3bff60a | 493 | /* We don't support people creating an event loop and keeping |
60f067b4 JS |
494 | * it around over a fork(). Let's complain. */ |
495 | ||
496 | return e->original_pid != getpid(); | |
497 | } | |
498 | ||
86f210e9 | 499 | static void source_io_unregister(sd_event_source *s) { |
60f067b4 JS |
500 | int r; |
501 | ||
502 | assert(s); | |
503 | assert(s->type == SOURCE_IO); | |
504 | ||
86f210e9 MP |
505 | if (event_pid_changed(s->event)) |
506 | return; | |
507 | ||
60f067b4 | 508 | if (!s->io.registered) |
86f210e9 | 509 | return; |
60f067b4 JS |
510 | |
511 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
d9dfd233 | 512 | if (r < 0) |
4c89c718 MP |
513 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m", |
514 | strna(s->description), event_source_type_to_string(s->type)); | |
60f067b4 JS |
515 | |
516 | s->io.registered = false; | |
60f067b4 JS |
517 | } |
518 | ||
519 | static int source_io_register( | |
520 | sd_event_source *s, | |
521 | int enabled, | |
522 | uint32_t events) { | |
523 | ||
524 | struct epoll_event ev = {}; | |
525 | int r; | |
526 | ||
527 | assert(s); | |
528 | assert(s->type == SOURCE_IO); | |
529 | assert(enabled != SD_EVENT_OFF); | |
530 | ||
531 | ev.events = events; | |
532 | ev.data.ptr = s; | |
533 | ||
534 | if (enabled == SD_EVENT_ONESHOT) | |
535 | ev.events |= EPOLLONESHOT; | |
536 | ||
537 | if (s->io.registered) | |
538 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
539 | else | |
540 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
60f067b4 JS |
541 | if (r < 0) |
542 | return -errno; | |
543 | ||
544 | s->io.registered = true; | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | static clockid_t event_source_type_to_clock(EventSourceType t) { | |
550 | ||
551 | switch (t) { | |
552 | ||
553 | case SOURCE_TIME_REALTIME: | |
554 | return CLOCK_REALTIME; | |
555 | ||
5eef597e MP |
556 | case SOURCE_TIME_BOOTTIME: |
557 | return CLOCK_BOOTTIME; | |
558 | ||
60f067b4 JS |
559 | case SOURCE_TIME_MONOTONIC: |
560 | return CLOCK_MONOTONIC; | |
561 | ||
562 | case SOURCE_TIME_REALTIME_ALARM: | |
563 | return CLOCK_REALTIME_ALARM; | |
564 | ||
565 | case SOURCE_TIME_BOOTTIME_ALARM: | |
566 | return CLOCK_BOOTTIME_ALARM; | |
567 | ||
568 | default: | |
569 | return (clockid_t) -1; | |
570 | } | |
571 | } | |
572 | ||
573 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
574 | ||
575 | switch (clock) { | |
576 | ||
577 | case CLOCK_REALTIME: | |
578 | return SOURCE_TIME_REALTIME; | |
579 | ||
5eef597e MP |
580 | case CLOCK_BOOTTIME: |
581 | return SOURCE_TIME_BOOTTIME; | |
582 | ||
60f067b4 JS |
583 | case CLOCK_MONOTONIC: |
584 | return SOURCE_TIME_MONOTONIC; | |
585 | ||
586 | case CLOCK_REALTIME_ALARM: | |
587 | return SOURCE_TIME_REALTIME_ALARM; | |
588 | ||
589 | case CLOCK_BOOTTIME_ALARM: | |
590 | return SOURCE_TIME_BOOTTIME_ALARM; | |
591 | ||
592 | default: | |
593 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
594 | } | |
595 | } | |
596 | ||
597 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
598 | assert(e); | |
599 | ||
600 | switch (t) { | |
601 | ||
602 | case SOURCE_TIME_REALTIME: | |
603 | return &e->realtime; | |
604 | ||
5eef597e MP |
605 | case SOURCE_TIME_BOOTTIME: |
606 | return &e->boottime; | |
607 | ||
60f067b4 JS |
608 | case SOURCE_TIME_MONOTONIC: |
609 | return &e->monotonic; | |
610 | ||
611 | case SOURCE_TIME_REALTIME_ALARM: | |
612 | return &e->realtime_alarm; | |
613 | ||
614 | case SOURCE_TIME_BOOTTIME_ALARM: | |
615 | return &e->boottime_alarm; | |
616 | ||
617 | default: | |
618 | return NULL; | |
619 | } | |
620 | } | |
621 | ||
d9dfd233 MP |
622 | static int event_make_signal_data( |
623 | sd_event *e, | |
624 | int sig, | |
625 | struct signal_data **ret) { | |
5eef597e | 626 | |
5eef597e | 627 | struct epoll_event ev = {}; |
d9dfd233 MP |
628 | struct signal_data *d; |
629 | bool added = false; | |
630 | sigset_t ss_copy; | |
631 | int64_t priority; | |
5eef597e MP |
632 | int r; |
633 | ||
634 | assert(e); | |
635 | ||
86f210e9 | 636 | if (event_pid_changed(e)) |
d9dfd233 | 637 | return -ECHILD; |
86f210e9 | 638 | |
d9dfd233 MP |
639 | if (e->signal_sources && e->signal_sources[sig]) |
640 | priority = e->signal_sources[sig]->priority; | |
641 | else | |
642 | priority = 0; | |
5eef597e | 643 | |
d9dfd233 MP |
644 | d = hashmap_get(e->signal_data, &priority); |
645 | if (d) { | |
646 | if (sigismember(&d->sigset, sig) > 0) { | |
647 | if (ret) | |
648 | *ret = d; | |
649 | return 0; | |
650 | } | |
651 | } else { | |
652 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); | |
653 | if (r < 0) | |
654 | return r; | |
655 | ||
656 | d = new0(struct signal_data, 1); | |
657 | if (!d) | |
658 | return -ENOMEM; | |
659 | ||
660 | d->wakeup = WAKEUP_SIGNAL_DATA; | |
661 | d->fd = -1; | |
662 | d->priority = priority; | |
663 | ||
664 | r = hashmap_put(e->signal_data, &d->priority, d); | |
4c89c718 MP |
665 | if (r < 0) { |
666 | free(d); | |
d9dfd233 | 667 | return r; |
4c89c718 | 668 | } |
d9dfd233 MP |
669 | |
670 | added = true; | |
671 | } | |
672 | ||
673 | ss_copy = d->sigset; | |
674 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
675 | ||
676 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
677 | if (r < 0) { | |
678 | r = -errno; | |
679 | goto fail; | |
680 | } | |
5eef597e | 681 | |
d9dfd233 | 682 | d->sigset = ss_copy; |
5eef597e | 683 | |
d9dfd233 MP |
684 | if (d->fd >= 0) { |
685 | if (ret) | |
686 | *ret = d; | |
5eef597e | 687 | return 0; |
d9dfd233 MP |
688 | } |
689 | ||
690 | d->fd = r; | |
5eef597e MP |
691 | |
692 | ev.events = EPOLLIN; | |
d9dfd233 | 693 | ev.data.ptr = d; |
5eef597e | 694 | |
d9dfd233 MP |
695 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
696 | if (r < 0) { | |
697 | r = -errno; | |
698 | goto fail; | |
5eef597e MP |
699 | } |
700 | ||
d9dfd233 MP |
701 | if (ret) |
702 | *ret = d; | |
703 | ||
5eef597e | 704 | return 0; |
d9dfd233 MP |
705 | |
706 | fail: | |
707 | if (added) { | |
708 | d->fd = safe_close(d->fd); | |
709 | hashmap_remove(e->signal_data, &d->priority); | |
710 | free(d); | |
711 | } | |
712 | ||
713 | return r; | |
714 | } | |
715 | ||
716 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
717 | assert(e); | |
718 | assert(d); | |
719 | ||
720 | /* Turns off the specified signal in the signal data | |
721 | * object. If the signal mask of the object becomes empty that | |
722 | * way removes it. */ | |
723 | ||
724 | if (sigismember(&d->sigset, sig) == 0) | |
725 | return; | |
726 | ||
727 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
728 | ||
729 | if (sigisemptyset(&d->sigset)) { | |
730 | ||
731 | /* If all the mask is all-zero we can get rid of the structure */ | |
732 | hashmap_remove(e->signal_data, &d->priority); | |
733 | assert(!d->current); | |
734 | safe_close(d->fd); | |
735 | free(d); | |
736 | return; | |
737 | } | |
738 | ||
739 | assert(d->fd >= 0); | |
740 | ||
741 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
742 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
743 | } | |
744 | ||
745 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
746 | struct signal_data *d; | |
747 | static const int64_t zero_priority = 0; | |
748 | ||
749 | assert(e); | |
750 | ||
751 | /* Rechecks if the specified signal is still something we are | |
752 | * interested in. If not, we'll unmask it, and possibly drop | |
753 | * the signalfd for it. */ | |
754 | ||
755 | if (sig == SIGCHLD && | |
756 | e->n_enabled_child_sources > 0) | |
757 | return; | |
758 | ||
759 | if (e->signal_sources && | |
760 | e->signal_sources[sig] && | |
761 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
762 | return; | |
763 | ||
764 | /* | |
765 | * The specified signal might be enabled in three different queues: | |
766 | * | |
767 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
768 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
769 | * 3) the 0 priority (to cover the SIGCHLD case) | |
770 | * | |
771 | * Hence, let's remove it from all three here. | |
772 | */ | |
773 | ||
774 | if (priority) { | |
775 | d = hashmap_get(e->signal_data, priority); | |
776 | if (d) | |
777 | event_unmask_signal_data(e, d, sig); | |
778 | } | |
779 | ||
780 | if (e->signal_sources && e->signal_sources[sig]) { | |
781 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
782 | if (d) | |
783 | event_unmask_signal_data(e, d, sig); | |
784 | } | |
785 | ||
786 | d = hashmap_get(e->signal_data, &zero_priority); | |
787 | if (d) | |
788 | event_unmask_signal_data(e, d, sig); | |
5eef597e MP |
789 | } |
790 | ||
60f067b4 JS |
791 | static void source_disconnect(sd_event_source *s) { |
792 | sd_event *event; | |
793 | ||
794 | assert(s); | |
795 | ||
796 | if (!s->event) | |
797 | return; | |
798 | ||
799 | assert(s->event->n_sources > 0); | |
800 | ||
801 | switch (s->type) { | |
802 | ||
803 | case SOURCE_IO: | |
804 | if (s->io.fd >= 0) | |
805 | source_io_unregister(s); | |
806 | ||
807 | break; | |
808 | ||
809 | case SOURCE_TIME_REALTIME: | |
5eef597e | 810 | case SOURCE_TIME_BOOTTIME: |
60f067b4 JS |
811 | case SOURCE_TIME_MONOTONIC: |
812 | case SOURCE_TIME_REALTIME_ALARM: | |
813 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
814 | struct clock_data *d; | |
815 | ||
816 | d = event_get_clock_data(s->event, s->type); | |
817 | assert(d); | |
818 | ||
819 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
820 | prioq_remove(d->latest, s, &s->time.latest_index); | |
5eef597e | 821 | d->needs_rearm = true; |
60f067b4 JS |
822 | break; |
823 | } | |
824 | ||
825 | case SOURCE_SIGNAL: | |
826 | if (s->signal.sig > 0) { | |
d9dfd233 | 827 | |
60f067b4 JS |
828 | if (s->event->signal_sources) |
829 | s->event->signal_sources[s->signal.sig] = NULL; | |
5eef597e | 830 | |
d9dfd233 | 831 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
60f067b4 JS |
832 | } |
833 | ||
834 | break; | |
835 | ||
836 | case SOURCE_CHILD: | |
837 | if (s->child.pid > 0) { | |
838 | if (s->enabled != SD_EVENT_OFF) { | |
839 | assert(s->event->n_enabled_child_sources > 0); | |
840 | s->event->n_enabled_child_sources--; | |
5eef597e | 841 | } |
60f067b4 | 842 | |
db2df898 | 843 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
d9dfd233 | 844 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
60f067b4 JS |
845 | } |
846 | ||
847 | break; | |
848 | ||
849 | case SOURCE_DEFER: | |
850 | /* nothing */ | |
851 | break; | |
852 | ||
853 | case SOURCE_POST: | |
854 | set_remove(s->event->post_sources, s); | |
855 | break; | |
856 | ||
857 | case SOURCE_EXIT: | |
858 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
859 | break; | |
860 | ||
861 | default: | |
862 | assert_not_reached("Wut? I shouldn't exist."); | |
863 | } | |
864 | ||
865 | if (s->pending) | |
866 | prioq_remove(s->event->pending, s, &s->pending_index); | |
867 | ||
868 | if (s->prepare) | |
869 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
870 | ||
871 | event = s->event; | |
872 | ||
873 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
874 | s->event = NULL; | |
875 | LIST_REMOVE(sources, event->sources, s); | |
876 | event->n_sources--; | |
877 | ||
878 | if (!s->floating) | |
879 | sd_event_unref(event); | |
880 | } | |
881 | ||
882 | static void source_free(sd_event_source *s) { | |
883 | assert(s); | |
884 | ||
885 | source_disconnect(s); | |
f47781d8 | 886 | free(s->description); |
60f067b4 JS |
887 | free(s); |
888 | } | |
889 | ||
890 | static int source_set_pending(sd_event_source *s, bool b) { | |
891 | int r; | |
892 | ||
893 | assert(s); | |
894 | assert(s->type != SOURCE_EXIT); | |
895 | ||
896 | if (s->pending == b) | |
897 | return 0; | |
898 | ||
899 | s->pending = b; | |
900 | ||
901 | if (b) { | |
902 | s->pending_iteration = s->event->iteration; | |
903 | ||
904 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
905 | if (r < 0) { | |
906 | s->pending = false; | |
907 | return r; | |
908 | } | |
909 | } else | |
910 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
911 | ||
912 | if (EVENT_SOURCE_IS_TIME(s->type)) { | |
913 | struct clock_data *d; | |
914 | ||
915 | d = event_get_clock_data(s->event, s->type); | |
916 | assert(d); | |
917 | ||
918 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
919 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
5eef597e | 920 | d->needs_rearm = true; |
60f067b4 JS |
921 | } |
922 | ||
d9dfd233 MP |
923 | if (s->type == SOURCE_SIGNAL && !b) { |
924 | struct signal_data *d; | |
925 | ||
926 | d = hashmap_get(s->event->signal_data, &s->priority); | |
927 | if (d && d->current == s) | |
928 | d->current = NULL; | |
929 | } | |
930 | ||
60f067b4 JS |
931 | return 0; |
932 | } | |
933 | ||
934 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { | |
935 | sd_event_source *s; | |
936 | ||
937 | assert(e); | |
938 | ||
939 | s = new0(sd_event_source, 1); | |
940 | if (!s) | |
941 | return NULL; | |
942 | ||
943 | s->n_ref = 1; | |
944 | s->event = e; | |
945 | s->floating = floating; | |
946 | s->type = type; | |
947 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; | |
948 | ||
949 | if (!floating) | |
950 | sd_event_ref(e); | |
951 | ||
952 | LIST_PREPEND(sources, e->sources, s); | |
aa27b158 | 953 | e->n_sources++; |
60f067b4 JS |
954 | |
955 | return s; | |
956 | } | |
957 | ||
958 | _public_ int sd_event_add_io( | |
959 | sd_event *e, | |
960 | sd_event_source **ret, | |
961 | int fd, | |
962 | uint32_t events, | |
963 | sd_event_io_handler_t callback, | |
964 | void *userdata) { | |
965 | ||
966 | sd_event_source *s; | |
967 | int r; | |
968 | ||
969 | assert_return(e, -EINVAL); | |
13d276d0 | 970 | assert_return(fd >= 0, -EBADF); |
60f067b4 JS |
971 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
972 | assert_return(callback, -EINVAL); | |
973 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
974 | assert_return(!event_pid_changed(e), -ECHILD); | |
975 | ||
976 | s = source_new(e, !ret, SOURCE_IO); | |
977 | if (!s) | |
978 | return -ENOMEM; | |
979 | ||
d9dfd233 | 980 | s->wakeup = WAKEUP_EVENT_SOURCE; |
60f067b4 JS |
981 | s->io.fd = fd; |
982 | s->io.events = events; | |
983 | s->io.callback = callback; | |
984 | s->userdata = userdata; | |
985 | s->enabled = SD_EVENT_ON; | |
986 | ||
987 | r = source_io_register(s, s->enabled, events); | |
988 | if (r < 0) { | |
989 | source_free(s); | |
5eef597e | 990 | return r; |
60f067b4 JS |
991 | } |
992 | ||
993 | if (ret) | |
994 | *ret = s; | |
995 | ||
996 | return 0; | |
997 | } | |
998 | ||
999 | static void initialize_perturb(sd_event *e) { | |
1000 | sd_id128_t bootid = {}; | |
1001 | ||
1002 | /* When we sleep for longer, we try to realign the wakeup to | |
1003 | the same time wihtin each minute/second/250ms, so that | |
1004 | events all across the system can be coalesced into a single | |
1005 | CPU wakeup. However, let's take some system-specific | |
1006 | randomness for this value, so that in a network of systems | |
1007 | with synced clocks timer events are distributed a | |
1008 | bit. Here, we calculate a perturbation usec offset from the | |
1009 | boot ID. */ | |
1010 | ||
5eef597e | 1011 | if (_likely_(e->perturb != USEC_INFINITY)) |
60f067b4 JS |
1012 | return; |
1013 | ||
1014 | if (sd_id128_get_boot(&bootid) >= 0) | |
1015 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
1016 | } | |
1017 | ||
1018 | static int event_setup_timer_fd( | |
1019 | sd_event *e, | |
1020 | struct clock_data *d, | |
1021 | clockid_t clock) { | |
1022 | ||
1023 | struct epoll_event ev = {}; | |
1024 | int r, fd; | |
1025 | ||
1026 | assert(e); | |
1027 | assert(d); | |
1028 | ||
1029 | if (_likely_(d->fd >= 0)) | |
1030 | return 0; | |
1031 | ||
1032 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); | |
1033 | if (fd < 0) | |
1034 | return -errno; | |
1035 | ||
1036 | ev.events = EPOLLIN; | |
d9dfd233 | 1037 | ev.data.ptr = d; |
60f067b4 JS |
1038 | |
1039 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
1040 | if (r < 0) { | |
1041 | safe_close(fd); | |
1042 | return -errno; | |
1043 | } | |
1044 | ||
1045 | d->fd = fd; | |
1046 | return 0; | |
1047 | } | |
1048 | ||
e735f4d4 MP |
1049 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1050 | assert(s); | |
1051 | ||
1052 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1053 | } | |
1054 | ||
60f067b4 JS |
1055 | _public_ int sd_event_add_time( |
1056 | sd_event *e, | |
1057 | sd_event_source **ret, | |
1058 | clockid_t clock, | |
1059 | uint64_t usec, | |
1060 | uint64_t accuracy, | |
1061 | sd_event_time_handler_t callback, | |
1062 | void *userdata) { | |
1063 | ||
1064 | EventSourceType type; | |
1065 | sd_event_source *s; | |
1066 | struct clock_data *d; | |
1067 | int r; | |
1068 | ||
1069 | assert_return(e, -EINVAL); | |
60f067b4 | 1070 | assert_return(accuracy != (uint64_t) -1, -EINVAL); |
60f067b4 JS |
1071 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1072 | assert_return(!event_pid_changed(e), -ECHILD); | |
1073 | ||
5a920b42 MP |
1074 | if (!clock_supported(clock)) /* Checks whether the kernel supports the clock */ |
1075 | return -EOPNOTSUPP; | |
1076 | ||
1077 | type = clock_to_event_source_type(clock); /* checks whether sd-event supports this clock */ | |
1078 | if (type < 0) | |
aa27b158 MP |
1079 | return -EOPNOTSUPP; |
1080 | ||
e735f4d4 MP |
1081 | if (!callback) |
1082 | callback = time_exit_callback; | |
1083 | ||
60f067b4 JS |
1084 | d = event_get_clock_data(e, type); |
1085 | assert(d); | |
1086 | ||
4c89c718 MP |
1087 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1088 | if (r < 0) | |
1089 | return r; | |
60f067b4 | 1090 | |
4c89c718 MP |
1091 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1092 | if (r < 0) | |
1093 | return r; | |
60f067b4 JS |
1094 | |
1095 | if (d->fd < 0) { | |
1096 | r = event_setup_timer_fd(e, d, clock); | |
1097 | if (r < 0) | |
1098 | return r; | |
1099 | } | |
1100 | ||
1101 | s = source_new(e, !ret, type); | |
1102 | if (!s) | |
1103 | return -ENOMEM; | |
1104 | ||
1105 | s->time.next = usec; | |
1106 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; | |
1107 | s->time.callback = callback; | |
1108 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; | |
1109 | s->userdata = userdata; | |
1110 | s->enabled = SD_EVENT_ONESHOT; | |
1111 | ||
5eef597e MP |
1112 | d->needs_rearm = true; |
1113 | ||
60f067b4 JS |
1114 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
1115 | if (r < 0) | |
1116 | goto fail; | |
1117 | ||
1118 | r = prioq_put(d->latest, s, &s->time.latest_index); | |
1119 | if (r < 0) | |
1120 | goto fail; | |
1121 | ||
1122 | if (ret) | |
1123 | *ret = s; | |
1124 | ||
1125 | return 0; | |
1126 | ||
1127 | fail: | |
1128 | source_free(s); | |
1129 | return r; | |
1130 | } | |
1131 | ||
60f067b4 JS |
1132 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1133 | assert(s); | |
1134 | ||
1135 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1136 | } | |
1137 | ||
1138 | _public_ int sd_event_add_signal( | |
1139 | sd_event *e, | |
1140 | sd_event_source **ret, | |
1141 | int sig, | |
1142 | sd_event_signal_handler_t callback, | |
1143 | void *userdata) { | |
1144 | ||
1145 | sd_event_source *s; | |
d9dfd233 | 1146 | struct signal_data *d; |
60f067b4 JS |
1147 | sigset_t ss; |
1148 | int r; | |
1149 | ||
1150 | assert_return(e, -EINVAL); | |
aa27b158 | 1151 | assert_return(SIGNAL_VALID(sig), -EINVAL); |
60f067b4 JS |
1152 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1153 | assert_return(!event_pid_changed(e), -ECHILD); | |
1154 | ||
1155 | if (!callback) | |
1156 | callback = signal_exit_callback; | |
1157 | ||
1158 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); | |
db2df898 MP |
1159 | if (r != 0) |
1160 | return -r; | |
60f067b4 JS |
1161 | |
1162 | if (!sigismember(&ss, sig)) | |
1163 | return -EBUSY; | |
1164 | ||
1165 | if (!e->signal_sources) { | |
1166 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1167 | if (!e->signal_sources) | |
1168 | return -ENOMEM; | |
1169 | } else if (e->signal_sources[sig]) | |
1170 | return -EBUSY; | |
1171 | ||
1172 | s = source_new(e, !ret, SOURCE_SIGNAL); | |
1173 | if (!s) | |
1174 | return -ENOMEM; | |
1175 | ||
1176 | s->signal.sig = sig; | |
1177 | s->signal.callback = callback; | |
1178 | s->userdata = userdata; | |
1179 | s->enabled = SD_EVENT_ON; | |
1180 | ||
1181 | e->signal_sources[sig] = s; | |
60f067b4 | 1182 | |
d9dfd233 MP |
1183 | r = event_make_signal_data(e, sig, &d); |
1184 | if (r < 0) { | |
1185 | source_free(s); | |
1186 | return r; | |
60f067b4 JS |
1187 | } |
1188 | ||
f47781d8 MP |
1189 | /* Use the signal name as description for the event source by default */ |
1190 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1191 | ||
60f067b4 JS |
1192 | if (ret) |
1193 | *ret = s; | |
1194 | ||
1195 | return 0; | |
1196 | } | |
1197 | ||
1198 | _public_ int sd_event_add_child( | |
1199 | sd_event *e, | |
1200 | sd_event_source **ret, | |
1201 | pid_t pid, | |
1202 | int options, | |
1203 | sd_event_child_handler_t callback, | |
1204 | void *userdata) { | |
1205 | ||
1206 | sd_event_source *s; | |
1207 | int r; | |
1208 | ||
1209 | assert_return(e, -EINVAL); | |
1210 | assert_return(pid > 1, -EINVAL); | |
1211 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1212 | assert_return(options != 0, -EINVAL); | |
1213 | assert_return(callback, -EINVAL); | |
1214 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1215 | assert_return(!event_pid_changed(e), -ECHILD); | |
1216 | ||
5eef597e | 1217 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
60f067b4 JS |
1218 | if (r < 0) |
1219 | return r; | |
1220 | ||
db2df898 | 1221 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
60f067b4 JS |
1222 | return -EBUSY; |
1223 | ||
1224 | s = source_new(e, !ret, SOURCE_CHILD); | |
1225 | if (!s) | |
1226 | return -ENOMEM; | |
1227 | ||
1228 | s->child.pid = pid; | |
1229 | s->child.options = options; | |
1230 | s->child.callback = callback; | |
1231 | s->userdata = userdata; | |
1232 | s->enabled = SD_EVENT_ONESHOT; | |
1233 | ||
db2df898 | 1234 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
60f067b4 JS |
1235 | if (r < 0) { |
1236 | source_free(s); | |
1237 | return r; | |
1238 | } | |
1239 | ||
aa27b158 | 1240 | e->n_enabled_child_sources++; |
60f067b4 | 1241 | |
d9dfd233 MP |
1242 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1243 | if (r < 0) { | |
1244 | e->n_enabled_child_sources--; | |
1245 | source_free(s); | |
1246 | return r; | |
60f067b4 JS |
1247 | } |
1248 | ||
1249 | e->need_process_child = true; | |
1250 | ||
1251 | if (ret) | |
1252 | *ret = s; | |
1253 | ||
1254 | return 0; | |
1255 | } | |
1256 | ||
1257 | _public_ int sd_event_add_defer( | |
1258 | sd_event *e, | |
1259 | sd_event_source **ret, | |
1260 | sd_event_handler_t callback, | |
1261 | void *userdata) { | |
1262 | ||
1263 | sd_event_source *s; | |
1264 | int r; | |
1265 | ||
1266 | assert_return(e, -EINVAL); | |
1267 | assert_return(callback, -EINVAL); | |
1268 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1269 | assert_return(!event_pid_changed(e), -ECHILD); | |
1270 | ||
1271 | s = source_new(e, !ret, SOURCE_DEFER); | |
1272 | if (!s) | |
1273 | return -ENOMEM; | |
1274 | ||
1275 | s->defer.callback = callback; | |
1276 | s->userdata = userdata; | |
1277 | s->enabled = SD_EVENT_ONESHOT; | |
1278 | ||
1279 | r = source_set_pending(s, true); | |
1280 | if (r < 0) { | |
1281 | source_free(s); | |
1282 | return r; | |
1283 | } | |
1284 | ||
1285 | if (ret) | |
1286 | *ret = s; | |
1287 | ||
1288 | return 0; | |
1289 | } | |
1290 | ||
1291 | _public_ int sd_event_add_post( | |
1292 | sd_event *e, | |
1293 | sd_event_source **ret, | |
1294 | sd_event_handler_t callback, | |
1295 | void *userdata) { | |
1296 | ||
1297 | sd_event_source *s; | |
1298 | int r; | |
1299 | ||
1300 | assert_return(e, -EINVAL); | |
1301 | assert_return(callback, -EINVAL); | |
1302 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1303 | assert_return(!event_pid_changed(e), -ECHILD); | |
1304 | ||
5eef597e | 1305 | r = set_ensure_allocated(&e->post_sources, NULL); |
60f067b4 JS |
1306 | if (r < 0) |
1307 | return r; | |
1308 | ||
1309 | s = source_new(e, !ret, SOURCE_POST); | |
1310 | if (!s) | |
1311 | return -ENOMEM; | |
1312 | ||
1313 | s->post.callback = callback; | |
1314 | s->userdata = userdata; | |
1315 | s->enabled = SD_EVENT_ON; | |
1316 | ||
1317 | r = set_put(e->post_sources, s); | |
1318 | if (r < 0) { | |
1319 | source_free(s); | |
1320 | return r; | |
1321 | } | |
1322 | ||
1323 | if (ret) | |
1324 | *ret = s; | |
1325 | ||
1326 | return 0; | |
1327 | } | |
1328 | ||
1329 | _public_ int sd_event_add_exit( | |
1330 | sd_event *e, | |
1331 | sd_event_source **ret, | |
1332 | sd_event_handler_t callback, | |
1333 | void *userdata) { | |
1334 | ||
1335 | sd_event_source *s; | |
1336 | int r; | |
1337 | ||
1338 | assert_return(e, -EINVAL); | |
1339 | assert_return(callback, -EINVAL); | |
1340 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1341 | assert_return(!event_pid_changed(e), -ECHILD); | |
1342 | ||
4c89c718 MP |
1343 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1344 | if (r < 0) | |
1345 | return r; | |
60f067b4 JS |
1346 | |
1347 | s = source_new(e, !ret, SOURCE_EXIT); | |
1348 | if (!s) | |
1349 | return -ENOMEM; | |
1350 | ||
1351 | s->exit.callback = callback; | |
1352 | s->userdata = userdata; | |
1353 | s->exit.prioq_index = PRIOQ_IDX_NULL; | |
1354 | s->enabled = SD_EVENT_ONESHOT; | |
1355 | ||
1356 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); | |
1357 | if (r < 0) { | |
1358 | source_free(s); | |
1359 | return r; | |
1360 | } | |
1361 | ||
1362 | if (ret) | |
1363 | *ret = s; | |
1364 | ||
1365 | return 0; | |
1366 | } | |
1367 | ||
1368 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { | |
4c89c718 MP |
1369 | |
1370 | if (!s) | |
1371 | return NULL; | |
60f067b4 JS |
1372 | |
1373 | assert(s->n_ref >= 1); | |
1374 | s->n_ref++; | |
1375 | ||
1376 | return s; | |
1377 | } | |
1378 | ||
1379 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { | |
1380 | ||
1381 | if (!s) | |
1382 | return NULL; | |
1383 | ||
1384 | assert(s->n_ref >= 1); | |
1385 | s->n_ref--; | |
1386 | ||
1387 | if (s->n_ref <= 0) { | |
1388 | /* Here's a special hack: when we are called from a | |
1389 | * dispatch handler we won't free the event source | |
1390 | * immediately, but we will detach the fd from the | |
1391 | * epoll. This way it is safe for the caller to unref | |
1392 | * the event source and immediately close the fd, but | |
1393 | * we still retain a valid event source object after | |
1394 | * the callback. */ | |
1395 | ||
1396 | if (s->dispatching) { | |
1397 | if (s->type == SOURCE_IO) | |
1398 | source_io_unregister(s); | |
1399 | ||
1400 | source_disconnect(s); | |
1401 | } else | |
1402 | source_free(s); | |
1403 | } | |
1404 | ||
1405 | return NULL; | |
1406 | } | |
1407 | ||
f47781d8 | 1408 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
5eef597e | 1409 | assert_return(s, -EINVAL); |
f47781d8 | 1410 | assert_return(!event_pid_changed(s->event), -ECHILD); |
5eef597e | 1411 | |
f47781d8 | 1412 | return free_and_strdup(&s->description, description); |
5eef597e MP |
1413 | } |
1414 | ||
f47781d8 | 1415 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
5eef597e | 1416 | assert_return(s, -EINVAL); |
f47781d8 MP |
1417 | assert_return(description, -EINVAL); |
1418 | assert_return(s->description, -ENXIO); | |
1419 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
5eef597e | 1420 | |
f47781d8 | 1421 | *description = s->description; |
5eef597e MP |
1422 | return 0; |
1423 | } | |
1424 | ||
60f067b4 JS |
1425 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
1426 | assert_return(s, NULL); | |
1427 | ||
1428 | return s->event; | |
1429 | } | |
1430 | ||
1431 | _public_ int sd_event_source_get_pending(sd_event_source *s) { | |
1432 | assert_return(s, -EINVAL); | |
1433 | assert_return(s->type != SOURCE_EXIT, -EDOM); | |
1434 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); | |
1435 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1436 | ||
1437 | return s->pending; | |
1438 | } | |
1439 | ||
1440 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { | |
1441 | assert_return(s, -EINVAL); | |
1442 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1443 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1444 | ||
1445 | return s->io.fd; | |
1446 | } | |
1447 | ||
1448 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { | |
1449 | int r; | |
1450 | ||
1451 | assert_return(s, -EINVAL); | |
13d276d0 | 1452 | assert_return(fd >= 0, -EBADF); |
60f067b4 JS |
1453 | assert_return(s->type == SOURCE_IO, -EDOM); |
1454 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1455 | ||
1456 | if (s->io.fd == fd) | |
1457 | return 0; | |
1458 | ||
1459 | if (s->enabled == SD_EVENT_OFF) { | |
1460 | s->io.fd = fd; | |
1461 | s->io.registered = false; | |
1462 | } else { | |
1463 | int saved_fd; | |
1464 | ||
1465 | saved_fd = s->io.fd; | |
1466 | assert(s->io.registered); | |
1467 | ||
1468 | s->io.fd = fd; | |
1469 | s->io.registered = false; | |
1470 | ||
1471 | r = source_io_register(s, s->enabled, s->io.events); | |
1472 | if (r < 0) { | |
1473 | s->io.fd = saved_fd; | |
1474 | s->io.registered = true; | |
1475 | return r; | |
1476 | } | |
1477 | ||
1478 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1479 | } | |
1480 | ||
1481 | return 0; | |
1482 | } | |
1483 | ||
1484 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { | |
1485 | assert_return(s, -EINVAL); | |
1486 | assert_return(events, -EINVAL); | |
1487 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1488 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1489 | ||
1490 | *events = s->io.events; | |
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { | |
1495 | int r; | |
1496 | ||
1497 | assert_return(s, -EINVAL); | |
1498 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1499 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); | |
1500 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); | |
1501 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1502 | ||
5eef597e MP |
1503 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1504 | if (s->io.events == events && !(events & EPOLLET)) | |
60f067b4 JS |
1505 | return 0; |
1506 | ||
1507 | if (s->enabled != SD_EVENT_OFF) { | |
1508 | r = source_io_register(s, s->enabled, events); | |
1509 | if (r < 0) | |
1510 | return r; | |
1511 | } | |
1512 | ||
1513 | s->io.events = events; | |
1514 | source_set_pending(s, false); | |
1515 | ||
1516 | return 0; | |
1517 | } | |
1518 | ||
1519 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { | |
1520 | assert_return(s, -EINVAL); | |
1521 | assert_return(revents, -EINVAL); | |
1522 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1523 | assert_return(s->pending, -ENODATA); | |
1524 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1525 | ||
1526 | *revents = s->io.revents; | |
1527 | return 0; | |
1528 | } | |
1529 | ||
1530 | _public_ int sd_event_source_get_signal(sd_event_source *s) { | |
1531 | assert_return(s, -EINVAL); | |
1532 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1533 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1534 | ||
1535 | return s->signal.sig; | |
1536 | } | |
1537 | ||
1538 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { | |
1539 | assert_return(s, -EINVAL); | |
1540 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1541 | ||
1542 | return s->priority; | |
1543 | } | |
1544 | ||
1545 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { | |
d9dfd233 MP |
1546 | int r; |
1547 | ||
60f067b4 JS |
1548 | assert_return(s, -EINVAL); |
1549 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); | |
1550 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1551 | ||
1552 | if (s->priority == priority) | |
1553 | return 0; | |
1554 | ||
d9dfd233 MP |
1555 | if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { |
1556 | struct signal_data *old, *d; | |
1557 | ||
1558 | /* Move us from the signalfd belonging to the old | |
1559 | * priority to the signalfd of the new priority */ | |
1560 | ||
1561 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
1562 | ||
1563 | s->priority = priority; | |
1564 | ||
1565 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
1566 | if (r < 0) { | |
1567 | s->priority = old->priority; | |
1568 | return r; | |
1569 | } | |
1570 | ||
1571 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
1572 | } else | |
1573 | s->priority = priority; | |
60f067b4 JS |
1574 | |
1575 | if (s->pending) | |
1576 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1577 | ||
1578 | if (s->prepare) | |
1579 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1580 | ||
1581 | if (s->type == SOURCE_EXIT) | |
1582 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
1583 | ||
1584 | return 0; | |
1585 | } | |
1586 | ||
1587 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { | |
1588 | assert_return(s, -EINVAL); | |
1589 | assert_return(m, -EINVAL); | |
1590 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1591 | ||
1592 | *m = s->enabled; | |
1593 | return 0; | |
1594 | } | |
1595 | ||
1596 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { | |
1597 | int r; | |
1598 | ||
1599 | assert_return(s, -EINVAL); | |
1600 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
1601 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1602 | ||
1603 | /* If we are dead anyway, we are fine with turning off | |
1604 | * sources, but everything else needs to fail. */ | |
1605 | if (s->event->state == SD_EVENT_FINISHED) | |
1606 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1607 | ||
1608 | if (s->enabled == m) | |
1609 | return 0; | |
1610 | ||
1611 | if (m == SD_EVENT_OFF) { | |
1612 | ||
1613 | switch (s->type) { | |
1614 | ||
1615 | case SOURCE_IO: | |
86f210e9 | 1616 | source_io_unregister(s); |
60f067b4 JS |
1617 | s->enabled = m; |
1618 | break; | |
1619 | ||
1620 | case SOURCE_TIME_REALTIME: | |
5eef597e | 1621 | case SOURCE_TIME_BOOTTIME: |
60f067b4 JS |
1622 | case SOURCE_TIME_MONOTONIC: |
1623 | case SOURCE_TIME_REALTIME_ALARM: | |
1624 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1625 | struct clock_data *d; | |
1626 | ||
1627 | s->enabled = m; | |
1628 | d = event_get_clock_data(s->event, s->type); | |
1629 | assert(d); | |
1630 | ||
1631 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1632 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
5eef597e | 1633 | d->needs_rearm = true; |
60f067b4 JS |
1634 | break; |
1635 | } | |
1636 | ||
1637 | case SOURCE_SIGNAL: | |
1638 | s->enabled = m; | |
5eef597e | 1639 | |
d9dfd233 | 1640 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
60f067b4 JS |
1641 | break; |
1642 | ||
1643 | case SOURCE_CHILD: | |
1644 | s->enabled = m; | |
1645 | ||
1646 | assert(s->event->n_enabled_child_sources > 0); | |
1647 | s->event->n_enabled_child_sources--; | |
1648 | ||
d9dfd233 | 1649 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
60f067b4 JS |
1650 | break; |
1651 | ||
1652 | case SOURCE_EXIT: | |
1653 | s->enabled = m; | |
1654 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
1655 | break; | |
1656 | ||
1657 | case SOURCE_DEFER: | |
1658 | case SOURCE_POST: | |
1659 | s->enabled = m; | |
1660 | break; | |
1661 | ||
1662 | default: | |
1663 | assert_not_reached("Wut? I shouldn't exist."); | |
1664 | } | |
1665 | ||
1666 | } else { | |
1667 | switch (s->type) { | |
1668 | ||
1669 | case SOURCE_IO: | |
1670 | r = source_io_register(s, m, s->io.events); | |
1671 | if (r < 0) | |
1672 | return r; | |
1673 | ||
1674 | s->enabled = m; | |
1675 | break; | |
1676 | ||
1677 | case SOURCE_TIME_REALTIME: | |
5eef597e | 1678 | case SOURCE_TIME_BOOTTIME: |
60f067b4 JS |
1679 | case SOURCE_TIME_MONOTONIC: |
1680 | case SOURCE_TIME_REALTIME_ALARM: | |
1681 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1682 | struct clock_data *d; | |
1683 | ||
1684 | s->enabled = m; | |
1685 | d = event_get_clock_data(s->event, s->type); | |
1686 | assert(d); | |
1687 | ||
1688 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1689 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
5eef597e | 1690 | d->needs_rearm = true; |
60f067b4 JS |
1691 | break; |
1692 | } | |
1693 | ||
1694 | case SOURCE_SIGNAL: | |
5eef597e MP |
1695 | |
1696 | s->enabled = m; | |
d9dfd233 MP |
1697 | |
1698 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
1699 | if (r < 0) { | |
1700 | s->enabled = SD_EVENT_OFF; | |
1701 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
1702 | return r; | |
1703 | } | |
1704 | ||
60f067b4 JS |
1705 | break; |
1706 | ||
1707 | case SOURCE_CHILD: | |
5eef597e | 1708 | |
d9dfd233 | 1709 | if (s->enabled == SD_EVENT_OFF) |
5eef597e | 1710 | s->event->n_enabled_child_sources++; |
60f067b4 JS |
1711 | |
1712 | s->enabled = m; | |
d9dfd233 MP |
1713 | |
1714 | r = event_make_signal_data(s->event, SIGCHLD, NULL); | |
1715 | if (r < 0) { | |
1716 | s->enabled = SD_EVENT_OFF; | |
1717 | s->event->n_enabled_child_sources--; | |
1718 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
1719 | return r; | |
1720 | } | |
1721 | ||
60f067b4 JS |
1722 | break; |
1723 | ||
1724 | case SOURCE_EXIT: | |
1725 | s->enabled = m; | |
1726 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
1727 | break; | |
1728 | ||
1729 | case SOURCE_DEFER: | |
1730 | case SOURCE_POST: | |
1731 | s->enabled = m; | |
1732 | break; | |
1733 | ||
1734 | default: | |
1735 | assert_not_reached("Wut? I shouldn't exist."); | |
1736 | } | |
1737 | } | |
1738 | ||
1739 | if (s->pending) | |
1740 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1741 | ||
1742 | if (s->prepare) | |
1743 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1744 | ||
1745 | return 0; | |
1746 | } | |
1747 | ||
1748 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { | |
1749 | assert_return(s, -EINVAL); | |
1750 | assert_return(usec, -EINVAL); | |
1751 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1752 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1753 | ||
1754 | *usec = s->time.next; | |
1755 | return 0; | |
1756 | } | |
1757 | ||
1758 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { | |
1759 | struct clock_data *d; | |
1760 | ||
1761 | assert_return(s, -EINVAL); | |
60f067b4 JS |
1762 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
1763 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); | |
1764 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1765 | ||
1766 | s->time.next = usec; | |
1767 | ||
1768 | source_set_pending(s, false); | |
1769 | ||
1770 | d = event_get_clock_data(s->event, s->type); | |
1771 | assert(d); | |
1772 | ||
1773 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1774 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
5eef597e | 1775 | d->needs_rearm = true; |
60f067b4 JS |
1776 | |
1777 | return 0; | |
1778 | } | |
1779 | ||
1780 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { | |
1781 | assert_return(s, -EINVAL); | |
1782 | assert_return(usec, -EINVAL); | |
1783 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1784 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1785 | ||
1786 | *usec = s->time.accuracy; | |
1787 | return 0; | |
1788 | } | |
1789 | ||
1790 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { | |
1791 | struct clock_data *d; | |
1792 | ||
1793 | assert_return(s, -EINVAL); | |
1794 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
1795 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1796 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); | |
1797 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1798 | ||
1799 | if (usec == 0) | |
1800 | usec = DEFAULT_ACCURACY_USEC; | |
1801 | ||
1802 | s->time.accuracy = usec; | |
1803 | ||
1804 | source_set_pending(s, false); | |
1805 | ||
1806 | d = event_get_clock_data(s->event, s->type); | |
1807 | assert(d); | |
1808 | ||
1809 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
5eef597e | 1810 | d->needs_rearm = true; |
60f067b4 JS |
1811 | |
1812 | return 0; | |
1813 | } | |
1814 | ||
1815 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1816 | assert_return(s, -EINVAL); | |
1817 | assert_return(clock, -EINVAL); | |
1818 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1819 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1820 | ||
1821 | *clock = event_source_type_to_clock(s->type); | |
1822 | return 0; | |
1823 | } | |
1824 | ||
1825 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { | |
1826 | assert_return(s, -EINVAL); | |
1827 | assert_return(pid, -EINVAL); | |
1828 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1829 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1830 | ||
1831 | *pid = s->child.pid; | |
1832 | return 0; | |
1833 | } | |
1834 | ||
1835 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { | |
1836 | int r; | |
1837 | ||
1838 | assert_return(s, -EINVAL); | |
1839 | assert_return(s->type != SOURCE_EXIT, -EDOM); | |
1840 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); | |
1841 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1842 | ||
1843 | if (s->prepare == callback) | |
1844 | return 0; | |
1845 | ||
1846 | if (callback && s->prepare) { | |
1847 | s->prepare = callback; | |
1848 | return 0; | |
1849 | } | |
1850 | ||
1851 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1852 | if (r < 0) | |
1853 | return r; | |
1854 | ||
1855 | s->prepare = callback; | |
1856 | ||
1857 | if (callback) { | |
1858 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1859 | if (r < 0) | |
1860 | return r; | |
1861 | } else | |
1862 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1863 | ||
1864 | return 0; | |
1865 | } | |
1866 | ||
1867 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { | |
1868 | assert_return(s, NULL); | |
1869 | ||
1870 | return s->userdata; | |
1871 | } | |
1872 | ||
1873 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { | |
1874 | void *ret; | |
1875 | ||
1876 | assert_return(s, NULL); | |
1877 | ||
1878 | ret = s->userdata; | |
1879 | s->userdata = userdata; | |
1880 | ||
1881 | return ret; | |
1882 | } | |
1883 | ||
1884 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { | |
1885 | usec_t c; | |
1886 | assert(e); | |
1887 | assert(a <= b); | |
1888 | ||
1889 | if (a <= 0) | |
1890 | return 0; | |
4c89c718 MP |
1891 | if (a >= USEC_INFINITY) |
1892 | return USEC_INFINITY; | |
60f067b4 JS |
1893 | |
1894 | if (b <= a + 1) | |
1895 | return a; | |
1896 | ||
1897 | initialize_perturb(e); | |
1898 | ||
1899 | /* | |
1900 | Find a good time to wake up again between times a and b. We | |
1901 | have two goals here: | |
1902 | ||
1903 | a) We want to wake up as seldom as possible, hence prefer | |
1904 | later times over earlier times. | |
1905 | ||
1906 | b) But if we have to wake up, then let's make sure to | |
1907 | dispatch as much as possible on the entire system. | |
1908 | ||
1909 | We implement this by waking up everywhere at the same time | |
1910 | within any given minute if we can, synchronised via the | |
1911 | perturbation value determined from the boot ID. If we can't, | |
1912 | then we try to find the same spot in every 10s, then 1s and | |
1913 | then 250ms step. Otherwise, we pick the last possible time | |
1914 | to wake up. | |
1915 | */ | |
1916 | ||
1917 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; | |
1918 | if (c >= b) { | |
1919 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1920 | return b; | |
1921 | ||
1922 | c -= USEC_PER_MINUTE; | |
1923 | } | |
1924 | ||
1925 | if (c >= a) | |
1926 | return c; | |
1927 | ||
1928 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1929 | if (c >= b) { | |
1930 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1931 | return b; | |
1932 | ||
1933 | c -= USEC_PER_SEC*10; | |
1934 | } | |
1935 | ||
1936 | if (c >= a) | |
1937 | return c; | |
1938 | ||
1939 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
1940 | if (c >= b) { | |
1941 | if (_unlikely_(c < USEC_PER_SEC)) | |
1942 | return b; | |
1943 | ||
1944 | c -= USEC_PER_SEC; | |
1945 | } | |
1946 | ||
1947 | if (c >= a) | |
1948 | return c; | |
1949 | ||
1950 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1951 | if (c >= b) { | |
1952 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1953 | return b; | |
1954 | ||
1955 | c -= USEC_PER_MSEC*250; | |
1956 | } | |
1957 | ||
1958 | if (c >= a) | |
1959 | return c; | |
1960 | ||
1961 | return b; | |
1962 | } | |
1963 | ||
1964 | static int event_arm_timer( | |
1965 | sd_event *e, | |
1966 | struct clock_data *d) { | |
1967 | ||
1968 | struct itimerspec its = {}; | |
1969 | sd_event_source *a, *b; | |
1970 | usec_t t; | |
1971 | int r; | |
1972 | ||
1973 | assert(e); | |
1974 | assert(d); | |
1975 | ||
5eef597e MP |
1976 | if (!d->needs_rearm) |
1977 | return 0; | |
1978 | else | |
1979 | d->needs_rearm = false; | |
1980 | ||
60f067b4 | 1981 | a = prioq_peek(d->earliest); |
4c89c718 | 1982 | if (!a || a->enabled == SD_EVENT_OFF || a->time.next == USEC_INFINITY) { |
60f067b4 JS |
1983 | |
1984 | if (d->fd < 0) | |
1985 | return 0; | |
1986 | ||
5eef597e | 1987 | if (d->next == USEC_INFINITY) |
60f067b4 JS |
1988 | return 0; |
1989 | ||
1990 | /* disarm */ | |
1991 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); | |
1992 | if (r < 0) | |
1993 | return r; | |
1994 | ||
5eef597e | 1995 | d->next = USEC_INFINITY; |
60f067b4 JS |
1996 | return 0; |
1997 | } | |
1998 | ||
1999 | b = prioq_peek(d->latest); | |
2000 | assert_se(b && b->enabled != SD_EVENT_OFF); | |
2001 | ||
4c89c718 | 2002 | t = sleep_between(e, a->time.next, time_event_source_latest(b)); |
60f067b4 JS |
2003 | if (d->next == t) |
2004 | return 0; | |
2005 | ||
2006 | assert_se(d->fd >= 0); | |
2007 | ||
2008 | if (t == 0) { | |
2009 | /* We don' want to disarm here, just mean some time looooong ago. */ | |
2010 | its.it_value.tv_sec = 0; | |
2011 | its.it_value.tv_nsec = 1; | |
2012 | } else | |
2013 | timespec_store(&its.it_value, t); | |
2014 | ||
2015 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); | |
2016 | if (r < 0) | |
2017 | return -errno; | |
2018 | ||
2019 | d->next = t; | |
2020 | return 0; | |
2021 | } | |
2022 | ||
2023 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { | |
2024 | assert(e); | |
2025 | assert(s); | |
2026 | assert(s->type == SOURCE_IO); | |
2027 | ||
2028 | /* If the event source was already pending, we just OR in the | |
2029 | * new revents, otherwise we reset the value. The ORing is | |
2030 | * necessary to handle EPOLLONESHOT events properly where | |
2031 | * readability might happen independently of writability, and | |
2032 | * we need to keep track of both */ | |
2033 | ||
2034 | if (s->pending) | |
2035 | s->io.revents |= revents; | |
2036 | else | |
2037 | s->io.revents = revents; | |
2038 | ||
2039 | return source_set_pending(s, true); | |
2040 | } | |
2041 | ||
2042 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { | |
2043 | uint64_t x; | |
2044 | ssize_t ss; | |
2045 | ||
2046 | assert(e); | |
2047 | assert(fd >= 0); | |
2048 | ||
2049 | assert_return(events == EPOLLIN, -EIO); | |
2050 | ||
2051 | ss = read(fd, &x, sizeof(x)); | |
2052 | if (ss < 0) { | |
2053 | if (errno == EAGAIN || errno == EINTR) | |
2054 | return 0; | |
2055 | ||
2056 | return -errno; | |
2057 | } | |
2058 | ||
2059 | if (_unlikely_(ss != sizeof(x))) | |
2060 | return -EIO; | |
2061 | ||
2062 | if (next) | |
5eef597e | 2063 | *next = USEC_INFINITY; |
60f067b4 JS |
2064 | |
2065 | return 0; | |
2066 | } | |
2067 | ||
2068 | static int process_timer( | |
2069 | sd_event *e, | |
2070 | usec_t n, | |
2071 | struct clock_data *d) { | |
2072 | ||
2073 | sd_event_source *s; | |
2074 | int r; | |
2075 | ||
2076 | assert(e); | |
2077 | assert(d); | |
2078 | ||
2079 | for (;;) { | |
2080 | s = prioq_peek(d->earliest); | |
2081 | if (!s || | |
2082 | s->time.next > n || | |
2083 | s->enabled == SD_EVENT_OFF || | |
2084 | s->pending) | |
2085 | break; | |
2086 | ||
2087 | r = source_set_pending(s, true); | |
2088 | if (r < 0) | |
2089 | return r; | |
2090 | ||
2091 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
2092 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
5eef597e | 2093 | d->needs_rearm = true; |
60f067b4 JS |
2094 | } |
2095 | ||
2096 | return 0; | |
2097 | } | |
2098 | ||
2099 | static int process_child(sd_event *e) { | |
2100 | sd_event_source *s; | |
2101 | Iterator i; | |
2102 | int r; | |
2103 | ||
2104 | assert(e); | |
2105 | ||
2106 | e->need_process_child = false; | |
2107 | ||
2108 | /* | |
2109 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2110 | + WNOHANG for each PID we wait for, instead of using | |
2111 | P_ALL. This is because we only want to get child | |
2112 | information of very specific child processes, and not all | |
2113 | of them. We might not have processed the SIGCHLD even of a | |
2114 | previous invocation and we don't want to maintain a | |
2115 | unbounded *per-child* event queue, hence we really don't | |
2116 | want anything flushed out of the kernel's queue that we | |
2117 | don't care about. Since this is O(n) this means that if you | |
2118 | have a lot of processes you probably want to handle SIGCHLD | |
2119 | yourself. | |
2120 | ||
2121 | We do not reap the children here (by using WNOWAIT), this | |
2122 | is only done after the event source is dispatched so that | |
2123 | the callback still sees the process as a zombie. | |
2124 | */ | |
2125 | ||
2126 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2127 | assert(s->type == SOURCE_CHILD); | |
2128 | ||
2129 | if (s->pending) | |
2130 | continue; | |
2131 | ||
2132 | if (s->enabled == SD_EVENT_OFF) | |
2133 | continue; | |
2134 | ||
2135 | zero(s->child.siginfo); | |
2136 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, | |
2137 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
2138 | if (r < 0) | |
2139 | return -errno; | |
2140 | ||
2141 | if (s->child.siginfo.si_pid != 0) { | |
2142 | bool zombie = | |
2143 | s->child.siginfo.si_code == CLD_EXITED || | |
2144 | s->child.siginfo.si_code == CLD_KILLED || | |
2145 | s->child.siginfo.si_code == CLD_DUMPED; | |
2146 | ||
2147 | if (!zombie && (s->child.options & WEXITED)) { | |
2148 | /* If the child isn't dead then let's | |
2149 | * immediately remove the state change | |
2150 | * from the queue, since there's no | |
2151 | * benefit in leaving it queued */ | |
2152 | ||
2153 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2154 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2155 | } | |
2156 | ||
2157 | r = source_set_pending(s, true); | |
2158 | if (r < 0) | |
2159 | return r; | |
2160 | } | |
2161 | } | |
2162 | ||
2163 | return 0; | |
2164 | } | |
2165 | ||
d9dfd233 | 2166 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
60f067b4 JS |
2167 | bool read_one = false; |
2168 | int r; | |
2169 | ||
2170 | assert(e); | |
60f067b4 JS |
2171 | assert_return(events == EPOLLIN, -EIO); |
2172 | ||
d9dfd233 MP |
2173 | /* If there's a signal queued on this priority and SIGCHLD is |
2174 | on this priority too, then make sure to recheck the | |
2175 | children we watch. This is because we only ever dequeue | |
2176 | the first signal per priority, and if we dequeue one, and | |
2177 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2178 | might have higher priority children we care about hence we | |
2179 | need to check that explicitly. */ | |
2180 | ||
2181 | if (sigismember(&d->sigset, SIGCHLD)) | |
2182 | e->need_process_child = true; | |
2183 | ||
2184 | /* If there's already an event source pending for this | |
2185 | * priority we don't read another */ | |
2186 | if (d->current) | |
2187 | return 0; | |
2188 | ||
60f067b4 JS |
2189 | for (;;) { |
2190 | struct signalfd_siginfo si; | |
5eef597e MP |
2191 | ssize_t n; |
2192 | sd_event_source *s = NULL; | |
60f067b4 | 2193 | |
d9dfd233 | 2194 | n = read(d->fd, &si, sizeof(si)); |
5eef597e | 2195 | if (n < 0) { |
60f067b4 JS |
2196 | if (errno == EAGAIN || errno == EINTR) |
2197 | return read_one; | |
2198 | ||
2199 | return -errno; | |
2200 | } | |
2201 | ||
5eef597e | 2202 | if (_unlikely_(n != sizeof(si))) |
60f067b4 JS |
2203 | return -EIO; |
2204 | ||
aa27b158 | 2205 | assert(SIGNAL_VALID(si.ssi_signo)); |
5eef597e | 2206 | |
60f067b4 JS |
2207 | read_one = true; |
2208 | ||
5eef597e MP |
2209 | if (e->signal_sources) |
2210 | s = e->signal_sources[si.ssi_signo]; | |
5eef597e MP |
2211 | if (!s) |
2212 | continue; | |
d9dfd233 MP |
2213 | if (s->pending) |
2214 | continue; | |
60f067b4 JS |
2215 | |
2216 | s->signal.siginfo = si; | |
d9dfd233 MP |
2217 | d->current = s; |
2218 | ||
60f067b4 JS |
2219 | r = source_set_pending(s, true); |
2220 | if (r < 0) | |
2221 | return r; | |
d9dfd233 MP |
2222 | |
2223 | return 1; | |
60f067b4 JS |
2224 | } |
2225 | } | |
2226 | ||
2227 | static int source_dispatch(sd_event_source *s) { | |
2228 | int r = 0; | |
2229 | ||
2230 | assert(s); | |
2231 | assert(s->pending || s->type == SOURCE_EXIT); | |
2232 | ||
2233 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { | |
2234 | r = source_set_pending(s, false); | |
2235 | if (r < 0) | |
2236 | return r; | |
2237 | } | |
2238 | ||
2239 | if (s->type != SOURCE_POST) { | |
2240 | sd_event_source *z; | |
2241 | Iterator i; | |
2242 | ||
2243 | /* If we execute a non-post source, let's mark all | |
2244 | * post sources as pending */ | |
2245 | ||
2246 | SET_FOREACH(z, s->event->post_sources, i) { | |
2247 | if (z->enabled == SD_EVENT_OFF) | |
2248 | continue; | |
2249 | ||
2250 | r = source_set_pending(z, true); | |
2251 | if (r < 0) | |
2252 | return r; | |
2253 | } | |
2254 | } | |
2255 | ||
2256 | if (s->enabled == SD_EVENT_ONESHOT) { | |
2257 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
2258 | if (r < 0) | |
2259 | return r; | |
2260 | } | |
2261 | ||
2262 | s->dispatching = true; | |
2263 | ||
2264 | switch (s->type) { | |
2265 | ||
2266 | case SOURCE_IO: | |
2267 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2268 | break; | |
2269 | ||
2270 | case SOURCE_TIME_REALTIME: | |
5eef597e | 2271 | case SOURCE_TIME_BOOTTIME: |
60f067b4 JS |
2272 | case SOURCE_TIME_MONOTONIC: |
2273 | case SOURCE_TIME_REALTIME_ALARM: | |
2274 | case SOURCE_TIME_BOOTTIME_ALARM: | |
2275 | r = s->time.callback(s, s->time.next, s->userdata); | |
2276 | break; | |
2277 | ||
2278 | case SOURCE_SIGNAL: | |
2279 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2280 | break; | |
2281 | ||
2282 | case SOURCE_CHILD: { | |
2283 | bool zombie; | |
2284 | ||
2285 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
2286 | s->child.siginfo.si_code == CLD_KILLED || | |
2287 | s->child.siginfo.si_code == CLD_DUMPED; | |
2288 | ||
2289 | r = s->child.callback(s, &s->child.siginfo, s->userdata); | |
2290 | ||
2291 | /* Now, reap the PID for good. */ | |
2292 | if (zombie) | |
2293 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2294 | ||
2295 | break; | |
2296 | } | |
2297 | ||
2298 | case SOURCE_DEFER: | |
2299 | r = s->defer.callback(s, s->userdata); | |
2300 | break; | |
2301 | ||
2302 | case SOURCE_POST: | |
2303 | r = s->post.callback(s, s->userdata); | |
2304 | break; | |
2305 | ||
2306 | case SOURCE_EXIT: | |
2307 | r = s->exit.callback(s, s->userdata); | |
2308 | break; | |
2309 | ||
2310 | case SOURCE_WATCHDOG: | |
2311 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: | |
2312 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: | |
2313 | assert_not_reached("Wut? I shouldn't exist."); | |
2314 | } | |
2315 | ||
2316 | s->dispatching = false; | |
2317 | ||
4c89c718 MP |
2318 | if (r < 0) |
2319 | log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m", | |
2320 | strna(s->description), event_source_type_to_string(s->type)); | |
60f067b4 JS |
2321 | |
2322 | if (s->n_ref == 0) | |
2323 | source_free(s); | |
2324 | else if (r < 0) | |
2325 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
2326 | ||
2327 | return 1; | |
2328 | } | |
2329 | ||
2330 | static int event_prepare(sd_event *e) { | |
2331 | int r; | |
2332 | ||
2333 | assert(e); | |
2334 | ||
2335 | for (;;) { | |
2336 | sd_event_source *s; | |
2337 | ||
2338 | s = prioq_peek(e->prepare); | |
2339 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) | |
2340 | break; | |
2341 | ||
2342 | s->prepare_iteration = e->iteration; | |
2343 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2344 | if (r < 0) | |
2345 | return r; | |
2346 | ||
2347 | assert(s->prepare); | |
2348 | ||
2349 | s->dispatching = true; | |
2350 | r = s->prepare(s, s->userdata); | |
2351 | s->dispatching = false; | |
2352 | ||
4c89c718 MP |
2353 | if (r < 0) |
2354 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m", | |
2355 | strna(s->description), event_source_type_to_string(s->type)); | |
60f067b4 JS |
2356 | |
2357 | if (s->n_ref == 0) | |
2358 | source_free(s); | |
2359 | else if (r < 0) | |
2360 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
2361 | } | |
2362 | ||
2363 | return 0; | |
2364 | } | |
2365 | ||
2366 | static int dispatch_exit(sd_event *e) { | |
2367 | sd_event_source *p; | |
2368 | int r; | |
2369 | ||
2370 | assert(e); | |
2371 | ||
2372 | p = prioq_peek(e->exit); | |
2373 | if (!p || p->enabled == SD_EVENT_OFF) { | |
2374 | e->state = SD_EVENT_FINISHED; | |
2375 | return 0; | |
2376 | } | |
2377 | ||
2378 | sd_event_ref(e); | |
2379 | e->iteration++; | |
2380 | e->state = SD_EVENT_EXITING; | |
2381 | ||
2382 | r = source_dispatch(p); | |
2383 | ||
e3bff60a | 2384 | e->state = SD_EVENT_INITIAL; |
60f067b4 JS |
2385 | sd_event_unref(e); |
2386 | ||
2387 | return r; | |
2388 | } | |
2389 | ||
2390 | static sd_event_source* event_next_pending(sd_event *e) { | |
2391 | sd_event_source *p; | |
2392 | ||
2393 | assert(e); | |
2394 | ||
2395 | p = prioq_peek(e->pending); | |
2396 | if (!p) | |
2397 | return NULL; | |
2398 | ||
2399 | if (p->enabled == SD_EVENT_OFF) | |
2400 | return NULL; | |
2401 | ||
2402 | return p; | |
2403 | } | |
2404 | ||
2405 | static int arm_watchdog(sd_event *e) { | |
2406 | struct itimerspec its = {}; | |
2407 | usec_t t; | |
2408 | int r; | |
2409 | ||
2410 | assert(e); | |
2411 | assert(e->watchdog_fd >= 0); | |
2412 | ||
2413 | t = sleep_between(e, | |
2414 | e->watchdog_last + (e->watchdog_period / 2), | |
2415 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2416 | ||
2417 | timespec_store(&its.it_value, t); | |
2418 | ||
2419 | /* Make sure we never set the watchdog to 0, which tells the | |
2420 | * kernel to disable it. */ | |
2421 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2422 | its.it_value.tv_nsec = 1; | |
2423 | ||
2424 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); | |
2425 | if (r < 0) | |
2426 | return -errno; | |
2427 | ||
2428 | return 0; | |
2429 | } | |
2430 | ||
2431 | static int process_watchdog(sd_event *e) { | |
2432 | assert(e); | |
2433 | ||
2434 | if (!e->watchdog) | |
2435 | return 0; | |
2436 | ||
2437 | /* Don't notify watchdog too often */ | |
2438 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2439 | return 0; | |
2440 | ||
2441 | sd_notify(false, "WATCHDOG=1"); | |
2442 | e->watchdog_last = e->timestamp.monotonic; | |
2443 | ||
2444 | return arm_watchdog(e); | |
2445 | } | |
2446 | ||
5eef597e MP |
2447 | _public_ int sd_event_prepare(sd_event *e) { |
2448 | int r; | |
60f067b4 JS |
2449 | |
2450 | assert_return(e, -EINVAL); | |
2451 | assert_return(!event_pid_changed(e), -ECHILD); | |
2452 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
e3bff60a | 2453 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
60f067b4 JS |
2454 | |
2455 | if (e->exit_requested) | |
5eef597e | 2456 | goto pending; |
60f067b4 | 2457 | |
60f067b4 | 2458 | e->iteration++; |
60f067b4 | 2459 | |
4c89c718 | 2460 | e->state = SD_EVENT_PREPARING; |
60f067b4 | 2461 | r = event_prepare(e); |
4c89c718 | 2462 | e->state = SD_EVENT_INITIAL; |
60f067b4 | 2463 | if (r < 0) |
5eef597e | 2464 | return r; |
60f067b4 JS |
2465 | |
2466 | r = event_arm_timer(e, &e->realtime); | |
2467 | if (r < 0) | |
5eef597e MP |
2468 | return r; |
2469 | ||
2470 | r = event_arm_timer(e, &e->boottime); | |
2471 | if (r < 0) | |
2472 | return r; | |
60f067b4 JS |
2473 | |
2474 | r = event_arm_timer(e, &e->monotonic); | |
2475 | if (r < 0) | |
5eef597e | 2476 | return r; |
60f067b4 JS |
2477 | |
2478 | r = event_arm_timer(e, &e->realtime_alarm); | |
2479 | if (r < 0) | |
5eef597e | 2480 | return r; |
60f067b4 JS |
2481 | |
2482 | r = event_arm_timer(e, &e->boottime_alarm); | |
2483 | if (r < 0) | |
5eef597e | 2484 | return r; |
60f067b4 JS |
2485 | |
2486 | if (event_next_pending(e) || e->need_process_child) | |
5eef597e MP |
2487 | goto pending; |
2488 | ||
e3bff60a | 2489 | e->state = SD_EVENT_ARMED; |
5eef597e MP |
2490 | |
2491 | return 0; | |
2492 | ||
2493 | pending: | |
e3bff60a | 2494 | e->state = SD_EVENT_ARMED; |
5eef597e MP |
2495 | r = sd_event_wait(e, 0); |
2496 | if (r == 0) | |
e3bff60a | 2497 | e->state = SD_EVENT_ARMED; |
5eef597e MP |
2498 | |
2499 | return r; | |
2500 | } | |
2501 | ||
2502 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2503 | struct epoll_event *ev_queue; | |
2504 | unsigned ev_queue_max; | |
2505 | int r, m, i; | |
2506 | ||
2507 | assert_return(e, -EINVAL); | |
2508 | assert_return(!event_pid_changed(e), -ECHILD); | |
2509 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
e3bff60a | 2510 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
5eef597e MP |
2511 | |
2512 | if (e->exit_requested) { | |
2513 | e->state = SD_EVENT_PENDING; | |
2514 | return 1; | |
2515 | } | |
60f067b4 | 2516 | |
e3bff60a | 2517 | ev_queue_max = MAX(e->n_sources, 1u); |
60f067b4 JS |
2518 | ev_queue = newa(struct epoll_event, ev_queue_max); |
2519 | ||
2520 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, | |
2521 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); | |
2522 | if (m < 0) { | |
5eef597e MP |
2523 | if (errno == EINTR) { |
2524 | e->state = SD_EVENT_PENDING; | |
2525 | return 1; | |
2526 | } | |
2527 | ||
2528 | r = -errno; | |
60f067b4 JS |
2529 | goto finish; |
2530 | } | |
2531 | ||
5a920b42 | 2532 | triple_timestamp_get(&e->timestamp); |
60f067b4 JS |
2533 | |
2534 | for (i = 0; i < m; i++) { | |
2535 | ||
d9dfd233 | 2536 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
60f067b4 | 2537 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
d9dfd233 MP |
2538 | else { |
2539 | WakeupType *t = ev_queue[i].data.ptr; | |
2540 | ||
2541 | switch (*t) { | |
2542 | ||
2543 | case WAKEUP_EVENT_SOURCE: | |
2544 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2545 | break; | |
60f067b4 | 2546 | |
d9dfd233 MP |
2547 | case WAKEUP_CLOCK_DATA: { |
2548 | struct clock_data *d = ev_queue[i].data.ptr; | |
2549 | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); | |
2550 | break; | |
2551 | } | |
2552 | ||
2553 | case WAKEUP_SIGNAL_DATA: | |
2554 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2555 | break; | |
2556 | ||
2557 | default: | |
2558 | assert_not_reached("Invalid wake-up pointer"); | |
2559 | } | |
2560 | } | |
60f067b4 JS |
2561 | if (r < 0) |
2562 | goto finish; | |
2563 | } | |
2564 | ||
2565 | r = process_watchdog(e); | |
2566 | if (r < 0) | |
2567 | goto finish; | |
2568 | ||
2569 | r = process_timer(e, e->timestamp.realtime, &e->realtime); | |
2570 | if (r < 0) | |
2571 | goto finish; | |
2572 | ||
5a920b42 | 2573 | r = process_timer(e, e->timestamp.boottime, &e->boottime); |
5eef597e MP |
2574 | if (r < 0) |
2575 | goto finish; | |
2576 | ||
60f067b4 JS |
2577 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2578 | if (r < 0) | |
2579 | goto finish; | |
2580 | ||
2581 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
2582 | if (r < 0) | |
2583 | goto finish; | |
2584 | ||
5a920b42 | 2585 | r = process_timer(e, e->timestamp.boottime, &e->boottime_alarm); |
60f067b4 JS |
2586 | if (r < 0) |
2587 | goto finish; | |
2588 | ||
2589 | if (e->need_process_child) { | |
2590 | r = process_child(e); | |
2591 | if (r < 0) | |
2592 | goto finish; | |
2593 | } | |
2594 | ||
5eef597e MP |
2595 | if (event_next_pending(e)) { |
2596 | e->state = SD_EVENT_PENDING; | |
2597 | ||
2598 | return 1; | |
60f067b4 JS |
2599 | } |
2600 | ||
5eef597e | 2601 | r = 0; |
60f067b4 JS |
2602 | |
2603 | finish: | |
e3bff60a | 2604 | e->state = SD_EVENT_INITIAL; |
60f067b4 JS |
2605 | |
2606 | return r; | |
2607 | } | |
2608 | ||
5eef597e MP |
2609 | _public_ int sd_event_dispatch(sd_event *e) { |
2610 | sd_event_source *p; | |
2611 | int r; | |
2612 | ||
2613 | assert_return(e, -EINVAL); | |
2614 | assert_return(!event_pid_changed(e), -ECHILD); | |
2615 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2616 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
2617 | ||
2618 | if (e->exit_requested) | |
2619 | return dispatch_exit(e); | |
2620 | ||
2621 | p = event_next_pending(e); | |
2622 | if (p) { | |
2623 | sd_event_ref(e); | |
2624 | ||
2625 | e->state = SD_EVENT_RUNNING; | |
2626 | r = source_dispatch(p); | |
e3bff60a | 2627 | e->state = SD_EVENT_INITIAL; |
5eef597e MP |
2628 | |
2629 | sd_event_unref(e); | |
2630 | ||
2631 | return r; | |
2632 | } | |
2633 | ||
e3bff60a | 2634 | e->state = SD_EVENT_INITIAL; |
5eef597e MP |
2635 | |
2636 | return 1; | |
2637 | } | |
2638 | ||
4c89c718 MP |
2639 | static void event_log_delays(sd_event *e) { |
2640 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1]; | |
2641 | unsigned i; | |
2642 | int o; | |
2643 | ||
2644 | for (i = o = 0; i < ELEMENTSOF(e->delays); i++) { | |
2645 | o += snprintf(&b[o], sizeof(b) - o, "%u ", e->delays[i]); | |
2646 | e->delays[i] = 0; | |
2647 | } | |
2648 | log_debug("Event loop iterations: %.*s", o, b); | |
2649 | } | |
2650 | ||
5eef597e MP |
2651 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
2652 | int r; | |
2653 | ||
2654 | assert_return(e, -EINVAL); | |
2655 | assert_return(!event_pid_changed(e), -ECHILD); | |
2656 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
e3bff60a | 2657 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
5eef597e | 2658 | |
4c89c718 MP |
2659 | if (e->profile_delays && e->last_run) { |
2660 | usec_t this_run; | |
2661 | unsigned l; | |
2662 | ||
2663 | this_run = now(CLOCK_MONOTONIC); | |
2664 | ||
2665 | l = u64log2(this_run - e->last_run); | |
2666 | assert(l < sizeof(e->delays)); | |
2667 | e->delays[l]++; | |
2668 | ||
2669 | if (this_run - e->last_log >= 5*USEC_PER_SEC) { | |
2670 | event_log_delays(e); | |
2671 | e->last_log = this_run; | |
2672 | } | |
2673 | } | |
2674 | ||
5eef597e | 2675 | r = sd_event_prepare(e); |
e3bff60a MP |
2676 | if (r == 0) |
2677 | /* There was nothing? Then wait... */ | |
2678 | r = sd_event_wait(e, timeout); | |
5eef597e | 2679 | |
4c89c718 MP |
2680 | if (e->profile_delays) |
2681 | e->last_run = now(CLOCK_MONOTONIC); | |
2682 | ||
e3bff60a MP |
2683 | if (r > 0) { |
2684 | /* There's something now, then let's dispatch it */ | |
2685 | r = sd_event_dispatch(e); | |
2686 | if (r < 0) | |
2687 | return r; | |
2688 | ||
2689 | return 1; | |
2690 | } | |
2691 | ||
2692 | return r; | |
5eef597e MP |
2693 | } |
2694 | ||
60f067b4 JS |
2695 | _public_ int sd_event_loop(sd_event *e) { |
2696 | int r; | |
2697 | ||
2698 | assert_return(e, -EINVAL); | |
2699 | assert_return(!event_pid_changed(e), -ECHILD); | |
e3bff60a | 2700 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
60f067b4 JS |
2701 | |
2702 | sd_event_ref(e); | |
2703 | ||
2704 | while (e->state != SD_EVENT_FINISHED) { | |
2705 | r = sd_event_run(e, (uint64_t) -1); | |
2706 | if (r < 0) | |
2707 | goto finish; | |
2708 | } | |
2709 | ||
2710 | r = e->exit_code; | |
2711 | ||
2712 | finish: | |
2713 | sd_event_unref(e); | |
2714 | return r; | |
2715 | } | |
2716 | ||
5eef597e MP |
2717 | _public_ int sd_event_get_fd(sd_event *e) { |
2718 | ||
2719 | assert_return(e, -EINVAL); | |
2720 | assert_return(!event_pid_changed(e), -ECHILD); | |
2721 | ||
2722 | return e->epoll_fd; | |
2723 | } | |
2724 | ||
60f067b4 JS |
2725 | _public_ int sd_event_get_state(sd_event *e) { |
2726 | assert_return(e, -EINVAL); | |
2727 | assert_return(!event_pid_changed(e), -ECHILD); | |
2728 | ||
2729 | return e->state; | |
2730 | } | |
2731 | ||
2732 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { | |
2733 | assert_return(e, -EINVAL); | |
2734 | assert_return(code, -EINVAL); | |
2735 | assert_return(!event_pid_changed(e), -ECHILD); | |
2736 | ||
2737 | if (!e->exit_requested) | |
2738 | return -ENODATA; | |
2739 | ||
2740 | *code = e->exit_code; | |
2741 | return 0; | |
2742 | } | |
2743 | ||
2744 | _public_ int sd_event_exit(sd_event *e, int code) { | |
2745 | assert_return(e, -EINVAL); | |
2746 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2747 | assert_return(!event_pid_changed(e), -ECHILD); | |
2748 | ||
2749 | e->exit_requested = true; | |
2750 | e->exit_code = code; | |
2751 | ||
2752 | return 0; | |
2753 | } | |
2754 | ||
2755 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { | |
2756 | assert_return(e, -EINVAL); | |
2757 | assert_return(usec, -EINVAL); | |
2758 | assert_return(!event_pid_changed(e), -ECHILD); | |
2759 | ||
5a920b42 MP |
2760 | if (!TRIPLE_TIMESTAMP_HAS_CLOCK(clock)) |
2761 | return -EOPNOTSUPP; | |
2762 | ||
2763 | /* Generate a clean error in case CLOCK_BOOTTIME is not available. Note that don't use clock_supported() here, | |
2764 | * for a reason: there are systems where CLOCK_BOOTTIME is supported, but CLOCK_BOOTTIME_ALARM is not, but for | |
2765 | * the purpose of getting the time this doesn't matter. */ | |
aa27b158 MP |
2766 | if (IN_SET(clock, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM) && !clock_boottime_supported()) |
2767 | return -EOPNOTSUPP; | |
2768 | ||
5a920b42 | 2769 | if (!triple_timestamp_is_set(&e->timestamp)) { |
13d276d0 MP |
2770 | /* Implicitly fall back to now() if we never ran |
2771 | * before and thus have no cached time. */ | |
2772 | *usec = now(clock); | |
2773 | return 1; | |
2774 | } | |
60f067b4 | 2775 | |
5a920b42 | 2776 | *usec = triple_timestamp_by_clock(&e->timestamp, clock); |
60f067b4 JS |
2777 | return 0; |
2778 | } | |
2779 | ||
2780 | _public_ int sd_event_default(sd_event **ret) { | |
2781 | ||
2782 | static thread_local sd_event *default_event = NULL; | |
2783 | sd_event *e = NULL; | |
2784 | int r; | |
2785 | ||
2786 | if (!ret) | |
2787 | return !!default_event; | |
2788 | ||
2789 | if (default_event) { | |
2790 | *ret = sd_event_ref(default_event); | |
2791 | return 0; | |
2792 | } | |
2793 | ||
2794 | r = sd_event_new(&e); | |
2795 | if (r < 0) | |
2796 | return r; | |
2797 | ||
2798 | e->default_event_ptr = &default_event; | |
2799 | e->tid = gettid(); | |
2800 | default_event = e; | |
2801 | ||
2802 | *ret = e; | |
2803 | return 1; | |
2804 | } | |
2805 | ||
2806 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2807 | assert_return(e, -EINVAL); | |
2808 | assert_return(tid, -EINVAL); | |
2809 | assert_return(!event_pid_changed(e), -ECHILD); | |
2810 | ||
2811 | if (e->tid != 0) { | |
2812 | *tid = e->tid; | |
2813 | return 0; | |
2814 | } | |
2815 | ||
2816 | return -ENXIO; | |
2817 | } | |
2818 | ||
2819 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2820 | int r; | |
2821 | ||
2822 | assert_return(e, -EINVAL); | |
2823 | assert_return(!event_pid_changed(e), -ECHILD); | |
2824 | ||
2825 | if (e->watchdog == !!b) | |
2826 | return e->watchdog; | |
2827 | ||
2828 | if (b) { | |
2829 | struct epoll_event ev = {}; | |
2830 | ||
2831 | r = sd_watchdog_enabled(false, &e->watchdog_period); | |
2832 | if (r <= 0) | |
2833 | return r; | |
2834 | ||
2835 | /* Issue first ping immediately */ | |
2836 | sd_notify(false, "WATCHDOG=1"); | |
2837 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2838 | ||
2839 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2840 | if (e->watchdog_fd < 0) | |
2841 | return -errno; | |
2842 | ||
2843 | r = arm_watchdog(e); | |
2844 | if (r < 0) | |
2845 | goto fail; | |
2846 | ||
2847 | ev.events = EPOLLIN; | |
2848 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2849 | ||
2850 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2851 | if (r < 0) { | |
2852 | r = -errno; | |
2853 | goto fail; | |
2854 | } | |
2855 | ||
2856 | } else { | |
2857 | if (e->watchdog_fd >= 0) { | |
2858 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
2859 | e->watchdog_fd = safe_close(e->watchdog_fd); | |
2860 | } | |
2861 | } | |
2862 | ||
2863 | e->watchdog = !!b; | |
2864 | return e->watchdog; | |
2865 | ||
2866 | fail: | |
2867 | e->watchdog_fd = safe_close(e->watchdog_fd); | |
2868 | return r; | |
2869 | } | |
2870 | ||
2871 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2872 | assert_return(e, -EINVAL); | |
2873 | assert_return(!event_pid_changed(e), -ECHILD); | |
2874 | ||
2875 | return e->watchdog; | |
2876 | } | |
5a920b42 MP |
2877 | |
2878 | _public_ int sd_event_get_iteration(sd_event *e, uint64_t *ret) { | |
2879 | assert_return(e, -EINVAL); | |
2880 | assert_return(!event_pid_changed(e), -ECHILD); | |
2881 | ||
2882 | *ret = e->iteration; | |
2883 | return 0; | |
2884 | } |