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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; | |
60a3b1e1 LP |
112 | uint64_t pending_iteration; |
113 | uint64_t prepare_iteration; | |
fd38203a | 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 | |
60a3b1e1 | 218 | uint64_t iteration; |
e475d10c | 219 | triple_timestamp timestamp; |
da7e457c | 220 | int state; |
eaa3cbef | 221 | |
6203e07a | 222 | bool exit_requested:1; |
da7e457c | 223 | bool need_process_child:1; |
cde93897 | 224 | bool watchdog:1; |
34b87517 | 225 | bool profile_delays:1; |
afc6adb5 | 226 | |
6203e07a LP |
227 | int exit_code; |
228 | ||
afc6adb5 LP |
229 | pid_t tid; |
230 | sd_event **default_event_ptr; | |
cde93897 LP |
231 | |
232 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
233 | |
234 | unsigned n_sources; | |
a71fe8b8 LP |
235 | |
236 | LIST_HEAD(sd_event_source, sources); | |
34b87517 VC |
237 | |
238 | usec_t last_run, last_log; | |
239 | unsigned delays[sizeof(usec_t) * 8]; | |
fd38203a LP |
240 | }; |
241 | ||
a71fe8b8 LP |
242 | static void source_disconnect(sd_event_source *s); |
243 | ||
fd38203a LP |
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 | ||
baf76283 LP |
250 | /* Enabled ones first */ |
251 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 252 | return -1; |
baf76283 | 253 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
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 | ||
fd38203a LP |
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 | ||
8046c457 KK |
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 | ||
fd38203a LP |
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 | ||
fd38203a LP |
291 | /* Lower priority values first */ |
292 | if (x->priority < y->priority) | |
293 | return -1; | |
294 | if (x->priority > y->priority) | |
295 | return 1; | |
296 | ||
fd38203a LP |
297 | return 0; |
298 | } | |
299 | ||
c2ba3ad6 | 300 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
301 | const sd_event_source *x = a, *y = b; |
302 | ||
6a0f1f6d LP |
303 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
304 | assert(x->type == y->type); | |
fd38203a | 305 | |
baf76283 LP |
306 | /* Enabled ones first */ |
307 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 308 | return -1; |
baf76283 | 309 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
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) | |
a99badf5 | 322 | return 1; |
fd38203a | 323 | |
fd38203a LP |
324 | return 0; |
325 | } | |
326 | ||
1bce0ffa LP |
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 | ||
c2ba3ad6 LP |
331 | static int latest_time_prioq_compare(const void *a, const void *b) { |
332 | const sd_event_source *x = a, *y = b; | |
333 | ||
6a0f1f6d LP |
334 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
335 | assert(x->type == y->type); | |
c2ba3ad6 | 336 | |
baf76283 LP |
337 | /* Enabled ones first */ |
338 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 339 | return -1; |
baf76283 | 340 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
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 */ | |
1bce0ffa | 350 | if (time_event_source_latest(x) < time_event_source_latest(y)) |
c2ba3ad6 | 351 | return -1; |
1bce0ffa | 352 | if (time_event_source_latest(x) > time_event_source_latest(y)) |
a99badf5 | 353 | return 1; |
c2ba3ad6 | 354 | |
c2ba3ad6 LP |
355 | return 0; |
356 | } | |
357 | ||
6203e07a | 358 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
359 | const sd_event_source *x = a, *y = b; |
360 | ||
6203e07a LP |
361 | assert(x->type == SOURCE_EXIT); |
362 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 363 | |
baf76283 LP |
364 | /* Enabled ones first */ |
365 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 366 | return -1; |
baf76283 | 367 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
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 | ||
da7e457c LP |
376 | return 0; |
377 | } | |
378 | ||
6a0f1f6d LP |
379 | static void free_clock_data(struct clock_data *d) { |
380 | assert(d); | |
9da4cb2b | 381 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
382 | |
383 | safe_close(d->fd); | |
384 | prioq_free(d->earliest); | |
385 | prioq_free(d->latest); | |
386 | } | |
387 | ||
fd38203a | 388 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
389 | sd_event_source *s; |
390 | ||
fd38203a | 391 | assert(e); |
a71fe8b8 LP |
392 | |
393 | while ((s = e->sources)) { | |
394 | assert(s->floating); | |
395 | source_disconnect(s); | |
396 | sd_event_source_unref(s); | |
397 | } | |
398 | ||
15b38f93 | 399 | assert(e->n_sources == 0); |
fd38203a | 400 | |
afc6adb5 LP |
401 | if (e->default_event_ptr) |
402 | *(e->default_event_ptr) = NULL; | |
403 | ||
03e334a1 | 404 | safe_close(e->epoll_fd); |
03e334a1 | 405 | safe_close(e->watchdog_fd); |
cde93897 | 406 | |
6a0f1f6d | 407 | free_clock_data(&e->realtime); |
a8548816 | 408 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
409 | free_clock_data(&e->monotonic); |
410 | free_clock_data(&e->realtime_alarm); | |
411 | free_clock_data(&e->boottime_alarm); | |
412 | ||
fd38203a LP |
413 | prioq_free(e->pending); |
414 | prioq_free(e->prepare); | |
6203e07a | 415 | prioq_free(e->exit); |
fd38203a LP |
416 | |
417 | free(e->signal_sources); | |
9da4cb2b | 418 | hashmap_free(e->signal_data); |
fd38203a LP |
419 | |
420 | hashmap_free(e->child_sources); | |
6e9feda3 | 421 | set_free(e->post_sources); |
fd38203a LP |
422 | free(e); |
423 | } | |
424 | ||
f7262a9f | 425 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
426 | sd_event *e; |
427 | int r; | |
428 | ||
305f78bf | 429 | assert_return(ret, -EINVAL); |
fd38203a LP |
430 | |
431 | e = new0(sd_event, 1); | |
432 | if (!e) | |
433 | return -ENOMEM; | |
434 | ||
da7e457c | 435 | e->n_ref = 1; |
9da4cb2b | 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; |
3a43da28 | 437 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
9da4cb2b | 438 | e->realtime.wakeup = e->boottime.wakeup = e->monotonic.wakeup = e->realtime_alarm.wakeup = e->boottime_alarm.wakeup = WAKEUP_CLOCK_DATA; |
df0ff127 | 439 | e->original_pid = getpid_cached(); |
3a43da28 | 440 | e->perturb = USEC_INFINITY; |
fd38203a | 441 | |
c983e776 EV |
442 | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
443 | if (r < 0) | |
fd38203a | 444 | goto fail; |
fd38203a LP |
445 | |
446 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
447 | if (e->epoll_fd < 0) { | |
448 | r = -errno; | |
449 | goto fail; | |
450 | } | |
451 | ||
34b87517 | 452 | if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) { |
34a6843d | 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."); |
34b87517 VC |
454 | e->profile_delays = true; |
455 | } | |
456 | ||
fd38203a LP |
457 | *ret = e; |
458 | return 0; | |
459 | ||
460 | fail: | |
461 | event_free(e); | |
462 | return r; | |
463 | } | |
464 | ||
f7262a9f | 465 | _public_ sd_event* sd_event_ref(sd_event *e) { |
6680dd6b LP |
466 | |
467 | if (!e) | |
468 | return NULL; | |
fd38203a | 469 | |
da7e457c LP |
470 | assert(e->n_ref >= 1); |
471 | e->n_ref++; | |
fd38203a LP |
472 | |
473 | return e; | |
474 | } | |
475 | ||
f7262a9f | 476 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
477 | |
478 | if (!e) | |
479 | return NULL; | |
fd38203a | 480 | |
da7e457c LP |
481 | assert(e->n_ref >= 1); |
482 | e->n_ref--; | |
483 | ||
484 | if (e->n_ref <= 0) | |
fd38203a LP |
485 | event_free(e); |
486 | ||
487 | return NULL; | |
488 | } | |
489 | ||
eaa3cbef LP |
490 | static bool event_pid_changed(sd_event *e) { |
491 | assert(e); | |
492 | ||
a2360a46 | 493 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
494 | * it around over a fork(). Let's complain. */ |
495 | ||
df0ff127 | 496 | return e->original_pid != getpid_cached(); |
eaa3cbef LP |
497 | } |
498 | ||
366e6411 | 499 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
500 | int r; |
501 | ||
502 | assert(s); | |
503 | assert(s->type == SOURCE_IO); | |
504 | ||
f6806734 | 505 | if (event_pid_changed(s->event)) |
366e6411 | 506 | return; |
f6806734 | 507 | |
fd38203a | 508 | if (!s->io.registered) |
366e6411 | 509 | return; |
fd38203a LP |
510 | |
511 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
556c25cf | 512 | if (r < 0) |
55cbfaa5 DM |
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)); | |
fd38203a LP |
515 | |
516 | s->io.registered = false; | |
fd38203a LP |
517 | } |
518 | ||
305f78bf LP |
519 | static int source_io_register( |
520 | sd_event_source *s, | |
521 | int enabled, | |
522 | uint32_t events) { | |
523 | ||
fd38203a LP |
524 | struct epoll_event ev = {}; |
525 | int r; | |
526 | ||
527 | assert(s); | |
528 | assert(s->type == SOURCE_IO); | |
baf76283 | 529 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
530 | |
531 | ev.events = events; | |
532 | ev.data.ptr = s; | |
533 | ||
baf76283 | 534 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
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); | |
fd38203a LP |
541 | if (r < 0) |
542 | return -errno; | |
543 | ||
544 | s->io.registered = true; | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
6a0f1f6d LP |
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 | ||
a8548816 TG |
556 | case SOURCE_TIME_BOOTTIME: |
557 | return CLOCK_BOOTTIME; | |
558 | ||
6a0f1f6d LP |
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 | ||
a8548816 TG |
580 | case CLOCK_BOOTTIME: |
581 | return SOURCE_TIME_BOOTTIME; | |
582 | ||
6a0f1f6d LP |
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 | ||
a8548816 TG |
605 | case SOURCE_TIME_BOOTTIME: |
606 | return &e->boottime; | |
607 | ||
6a0f1f6d LP |
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 | ||
9da4cb2b LP |
622 | static int event_make_signal_data( |
623 | sd_event *e, | |
624 | int sig, | |
625 | struct signal_data **ret) { | |
4807d2d0 | 626 | |
f95387cd | 627 | struct epoll_event ev = {}; |
9da4cb2b LP |
628 | struct signal_data *d; |
629 | bool added = false; | |
630 | sigset_t ss_copy; | |
631 | int64_t priority; | |
f95387cd ZJS |
632 | int r; |
633 | ||
634 | assert(e); | |
635 | ||
f6806734 | 636 | if (event_pid_changed(e)) |
9da4cb2b | 637 | return -ECHILD; |
f6806734 | 638 | |
9da4cb2b LP |
639 | if (e->signal_sources && e->signal_sources[sig]) |
640 | priority = e->signal_sources[sig]->priority; | |
641 | else | |
642 | priority = 0; | |
f95387cd | 643 | |
9da4cb2b LP |
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); | |
90f604d1 ZJS |
665 | if (r < 0) { |
666 | free(d); | |
9da4cb2b | 667 | return r; |
90f604d1 | 668 | } |
f95387cd | 669 | |
9da4cb2b LP |
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 | } | |
681 | ||
682 | d->sigset = ss_copy; | |
f95387cd | 683 | |
9da4cb2b LP |
684 | if (d->fd >= 0) { |
685 | if (ret) | |
686 | *ret = d; | |
f95387cd | 687 | return 0; |
9da4cb2b LP |
688 | } |
689 | ||
690 | d->fd = r; | |
f95387cd ZJS |
691 | |
692 | ev.events = EPOLLIN; | |
9da4cb2b | 693 | ev.data.ptr = d; |
f95387cd | 694 | |
9da4cb2b LP |
695 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
696 | if (r < 0) { | |
697 | r = -errno; | |
698 | goto fail; | |
f95387cd ZJS |
699 | } |
700 | ||
9da4cb2b LP |
701 | if (ret) |
702 | *ret = d; | |
703 | ||
f95387cd | 704 | return 0; |
9da4cb2b LP |
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); | |
9da4cb2b LP |
733 | safe_close(d->fd); |
734 | free(d); | |
735 | return; | |
736 | } | |
737 | ||
738 | assert(d->fd >= 0); | |
739 | ||
740 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
741 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
742 | } | |
743 | ||
744 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
745 | struct signal_data *d; | |
746 | static const int64_t zero_priority = 0; | |
747 | ||
748 | assert(e); | |
749 | ||
750 | /* Rechecks if the specified signal is still something we are | |
751 | * interested in. If not, we'll unmask it, and possibly drop | |
752 | * the signalfd for it. */ | |
753 | ||
754 | if (sig == SIGCHLD && | |
755 | e->n_enabled_child_sources > 0) | |
756 | return; | |
757 | ||
758 | if (e->signal_sources && | |
759 | e->signal_sources[sig] && | |
760 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
761 | return; | |
762 | ||
763 | /* | |
764 | * The specified signal might be enabled in three different queues: | |
765 | * | |
766 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
767 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
768 | * 3) the 0 priority (to cover the SIGCHLD case) | |
769 | * | |
770 | * Hence, let's remove it from all three here. | |
771 | */ | |
772 | ||
773 | if (priority) { | |
774 | d = hashmap_get(e->signal_data, priority); | |
775 | if (d) | |
776 | event_unmask_signal_data(e, d, sig); | |
777 | } | |
778 | ||
779 | if (e->signal_sources && e->signal_sources[sig]) { | |
780 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
781 | if (d) | |
782 | event_unmask_signal_data(e, d, sig); | |
783 | } | |
784 | ||
785 | d = hashmap_get(e->signal_data, &zero_priority); | |
786 | if (d) | |
787 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
788 | } |
789 | ||
a71fe8b8 LP |
790 | static void source_disconnect(sd_event_source *s) { |
791 | sd_event *event; | |
792 | ||
fd38203a LP |
793 | assert(s); |
794 | ||
a71fe8b8 LP |
795 | if (!s->event) |
796 | return; | |
15b38f93 | 797 | |
a71fe8b8 | 798 | assert(s->event->n_sources > 0); |
fd38203a | 799 | |
a71fe8b8 | 800 | switch (s->type) { |
fd38203a | 801 | |
a71fe8b8 LP |
802 | case SOURCE_IO: |
803 | if (s->io.fd >= 0) | |
804 | source_io_unregister(s); | |
fd38203a | 805 | |
a71fe8b8 | 806 | break; |
6a0f1f6d | 807 | |
a71fe8b8 | 808 | case SOURCE_TIME_REALTIME: |
a8548816 | 809 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
810 | case SOURCE_TIME_MONOTONIC: |
811 | case SOURCE_TIME_REALTIME_ALARM: | |
812 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
813 | struct clock_data *d; | |
fd38203a | 814 | |
a71fe8b8 LP |
815 | d = event_get_clock_data(s->event, s->type); |
816 | assert(d); | |
817 | ||
818 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
819 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 820 | d->needs_rearm = true; |
a71fe8b8 LP |
821 | break; |
822 | } | |
823 | ||
824 | case SOURCE_SIGNAL: | |
825 | if (s->signal.sig > 0) { | |
9da4cb2b | 826 | |
a71fe8b8 LP |
827 | if (s->event->signal_sources) |
828 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 829 | |
9da4cb2b | 830 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 831 | } |
fd38203a | 832 | |
a71fe8b8 | 833 | break; |
fd38203a | 834 | |
a71fe8b8 LP |
835 | case SOURCE_CHILD: |
836 | if (s->child.pid > 0) { | |
837 | if (s->enabled != SD_EVENT_OFF) { | |
838 | assert(s->event->n_enabled_child_sources > 0); | |
839 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 840 | } |
fd38203a | 841 | |
4a0b58c4 | 842 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
9da4cb2b | 843 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
a71fe8b8 | 844 | } |
fd38203a | 845 | |
a71fe8b8 | 846 | break; |
fd38203a | 847 | |
a71fe8b8 LP |
848 | case SOURCE_DEFER: |
849 | /* nothing */ | |
850 | break; | |
fd38203a | 851 | |
a71fe8b8 LP |
852 | case SOURCE_POST: |
853 | set_remove(s->event->post_sources, s); | |
854 | break; | |
da7e457c | 855 | |
a71fe8b8 LP |
856 | case SOURCE_EXIT: |
857 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
858 | break; | |
0eb2e0e3 | 859 | |
a71fe8b8 LP |
860 | default: |
861 | assert_not_reached("Wut? I shouldn't exist."); | |
862 | } | |
6e9feda3 | 863 | |
a71fe8b8 LP |
864 | if (s->pending) |
865 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 866 | |
a71fe8b8 LP |
867 | if (s->prepare) |
868 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 869 | |
a71fe8b8 | 870 | event = s->event; |
fd38203a | 871 | |
a71fe8b8 LP |
872 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
873 | s->event = NULL; | |
874 | LIST_REMOVE(sources, event->sources, s); | |
875 | event->n_sources--; | |
fd38203a | 876 | |
a71fe8b8 LP |
877 | if (!s->floating) |
878 | sd_event_unref(event); | |
879 | } | |
880 | ||
881 | static void source_free(sd_event_source *s) { | |
882 | assert(s); | |
fd38203a | 883 | |
a71fe8b8 | 884 | source_disconnect(s); |
356779df | 885 | free(s->description); |
fd38203a LP |
886 | free(s); |
887 | } | |
888 | ||
889 | static int source_set_pending(sd_event_source *s, bool b) { | |
890 | int r; | |
891 | ||
892 | assert(s); | |
6203e07a | 893 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
894 | |
895 | if (s->pending == b) | |
896 | return 0; | |
897 | ||
898 | s->pending = b; | |
899 | ||
900 | if (b) { | |
901 | s->pending_iteration = s->event->iteration; | |
902 | ||
903 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
904 | if (r < 0) { | |
905 | s->pending = false; | |
906 | return r; | |
907 | } | |
908 | } else | |
909 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
910 | ||
6a0f1f6d LP |
911 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
912 | struct clock_data *d; | |
913 | ||
914 | d = event_get_clock_data(s->event, s->type); | |
915 | assert(d); | |
916 | ||
917 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
918 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 919 | d->needs_rearm = true; |
2576a19e LP |
920 | } |
921 | ||
9da4cb2b LP |
922 | if (s->type == SOURCE_SIGNAL && !b) { |
923 | struct signal_data *d; | |
924 | ||
925 | d = hashmap_get(s->event->signal_data, &s->priority); | |
926 | if (d && d->current == s) | |
927 | d->current = NULL; | |
928 | } | |
929 | ||
fd38203a LP |
930 | return 0; |
931 | } | |
932 | ||
a71fe8b8 | 933 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
934 | sd_event_source *s; |
935 | ||
936 | assert(e); | |
937 | ||
938 | s = new0(sd_event_source, 1); | |
939 | if (!s) | |
940 | return NULL; | |
941 | ||
da7e457c | 942 | s->n_ref = 1; |
a71fe8b8 | 943 | s->event = e; |
4a134c49 | 944 | s->floating = floating; |
fd38203a | 945 | s->type = type; |
fd38203a | 946 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
947 | |
948 | if (!floating) | |
949 | sd_event_ref(e); | |
fd38203a | 950 | |
a71fe8b8 | 951 | LIST_PREPEND(sources, e->sources, s); |
313cefa1 | 952 | e->n_sources++; |
15b38f93 | 953 | |
fd38203a LP |
954 | return s; |
955 | } | |
956 | ||
f7262a9f | 957 | _public_ int sd_event_add_io( |
fd38203a | 958 | sd_event *e, |
151b9b96 | 959 | sd_event_source **ret, |
fd38203a LP |
960 | int fd, |
961 | uint32_t events, | |
718db961 | 962 | sd_event_io_handler_t callback, |
151b9b96 | 963 | void *userdata) { |
fd38203a LP |
964 | |
965 | sd_event_source *s; | |
966 | int r; | |
967 | ||
305f78bf | 968 | assert_return(e, -EINVAL); |
8ac43fee | 969 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 970 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 971 | assert_return(callback, -EINVAL); |
da7e457c | 972 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 973 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 974 | |
a71fe8b8 | 975 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
976 | if (!s) |
977 | return -ENOMEM; | |
978 | ||
9da4cb2b | 979 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
980 | s->io.fd = fd; |
981 | s->io.events = events; | |
982 | s->io.callback = callback; | |
983 | s->userdata = userdata; | |
baf76283 | 984 | s->enabled = SD_EVENT_ON; |
fd38203a | 985 | |
baf76283 | 986 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
987 | if (r < 0) { |
988 | source_free(s); | |
050f74f2 | 989 | return r; |
fd38203a LP |
990 | } |
991 | ||
a71fe8b8 LP |
992 | if (ret) |
993 | *ret = s; | |
994 | ||
fd38203a LP |
995 | return 0; |
996 | } | |
997 | ||
52444dc4 LP |
998 | static void initialize_perturb(sd_event *e) { |
999 | sd_id128_t bootid = {}; | |
1000 | ||
1001 | /* When we sleep for longer, we try to realign the wakeup to | |
1002 | the same time wihtin each minute/second/250ms, so that | |
1003 | events all across the system can be coalesced into a single | |
1004 | CPU wakeup. However, let's take some system-specific | |
1005 | randomness for this value, so that in a network of systems | |
1006 | with synced clocks timer events are distributed a | |
1007 | bit. Here, we calculate a perturbation usec offset from the | |
1008 | boot ID. */ | |
1009 | ||
3a43da28 | 1010 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
1011 | return; |
1012 | ||
1013 | if (sd_id128_get_boot(&bootid) >= 0) | |
1014 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
1015 | } | |
1016 | ||
fd38203a LP |
1017 | static int event_setup_timer_fd( |
1018 | sd_event *e, | |
6a0f1f6d LP |
1019 | struct clock_data *d, |
1020 | clockid_t clock) { | |
fd38203a LP |
1021 | |
1022 | struct epoll_event ev = {}; | |
1023 | int r, fd; | |
1024 | ||
1025 | assert(e); | |
6a0f1f6d | 1026 | assert(d); |
fd38203a | 1027 | |
6a0f1f6d | 1028 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
1029 | return 0; |
1030 | ||
6a0f1f6d | 1031 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
1032 | if (fd < 0) |
1033 | return -errno; | |
1034 | ||
1035 | ev.events = EPOLLIN; | |
9da4cb2b | 1036 | ev.data.ptr = d; |
fd38203a LP |
1037 | |
1038 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
1039 | if (r < 0) { | |
03e334a1 | 1040 | safe_close(fd); |
fd38203a LP |
1041 | return -errno; |
1042 | } | |
1043 | ||
6a0f1f6d | 1044 | d->fd = fd; |
fd38203a LP |
1045 | return 0; |
1046 | } | |
1047 | ||
c4f1aff2 TG |
1048 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1049 | assert(s); | |
1050 | ||
1051 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1052 | } | |
1053 | ||
6a0f1f6d | 1054 | _public_ int sd_event_add_time( |
fd38203a | 1055 | sd_event *e, |
151b9b96 | 1056 | sd_event_source **ret, |
6a0f1f6d | 1057 | clockid_t clock, |
fd38203a | 1058 | uint64_t usec, |
c2ba3ad6 | 1059 | uint64_t accuracy, |
718db961 | 1060 | sd_event_time_handler_t callback, |
151b9b96 | 1061 | void *userdata) { |
fd38203a | 1062 | |
6a0f1f6d | 1063 | EventSourceType type; |
fd38203a | 1064 | sd_event_source *s; |
6a0f1f6d | 1065 | struct clock_data *d; |
fd38203a LP |
1066 | int r; |
1067 | ||
305f78bf | 1068 | assert_return(e, -EINVAL); |
305f78bf | 1069 | assert_return(accuracy != (uint64_t) -1, -EINVAL); |
da7e457c | 1070 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1071 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1072 | |
e475d10c LP |
1073 | if (!clock_supported(clock)) /* Checks whether the kernel supports the clock */ |
1074 | return -EOPNOTSUPP; | |
1075 | ||
1076 | type = clock_to_event_source_type(clock); /* checks whether sd-event supports this clock */ | |
1077 | if (type < 0) | |
3411372e LP |
1078 | return -EOPNOTSUPP; |
1079 | ||
c4f1aff2 TG |
1080 | if (!callback) |
1081 | callback = time_exit_callback; | |
1082 | ||
6a0f1f6d LP |
1083 | d = event_get_clock_data(e, type); |
1084 | assert(d); | |
c2ba3ad6 | 1085 | |
c983e776 EV |
1086 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1087 | if (r < 0) | |
1088 | return r; | |
fd38203a | 1089 | |
c983e776 EV |
1090 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1091 | if (r < 0) | |
1092 | return r; | |
fd38203a | 1093 | |
6a0f1f6d LP |
1094 | if (d->fd < 0) { |
1095 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1096 | if (r < 0) |
1097 | return r; | |
1098 | } | |
1099 | ||
a71fe8b8 | 1100 | s = source_new(e, !ret, type); |
fd38203a LP |
1101 | if (!s) |
1102 | return -ENOMEM; | |
1103 | ||
1104 | s->time.next = usec; | |
c2ba3ad6 | 1105 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1106 | s->time.callback = callback; |
da7e457c | 1107 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1108 | s->userdata = userdata; |
baf76283 | 1109 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1110 | |
e07bbb7c TG |
1111 | d->needs_rearm = true; |
1112 | ||
6a0f1f6d | 1113 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
1114 | if (r < 0) |
1115 | goto fail; | |
1116 | ||
6a0f1f6d | 1117 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
1118 | if (r < 0) |
1119 | goto fail; | |
fd38203a | 1120 | |
a71fe8b8 LP |
1121 | if (ret) |
1122 | *ret = s; | |
1123 | ||
fd38203a | 1124 | return 0; |
c2ba3ad6 LP |
1125 | |
1126 | fail: | |
1127 | source_free(s); | |
1128 | return r; | |
fd38203a LP |
1129 | } |
1130 | ||
59bc1fd7 LP |
1131 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1132 | assert(s); | |
1133 | ||
1134 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1135 | } | |
1136 | ||
f7262a9f | 1137 | _public_ int sd_event_add_signal( |
305f78bf | 1138 | sd_event *e, |
151b9b96 | 1139 | sd_event_source **ret, |
305f78bf | 1140 | int sig, |
718db961 | 1141 | sd_event_signal_handler_t callback, |
151b9b96 | 1142 | void *userdata) { |
305f78bf | 1143 | |
fd38203a | 1144 | sd_event_source *s; |
9da4cb2b | 1145 | struct signal_data *d; |
3022d74b | 1146 | sigset_t ss; |
fd38203a LP |
1147 | int r; |
1148 | ||
305f78bf | 1149 | assert_return(e, -EINVAL); |
6eb7c172 | 1150 | assert_return(SIGNAL_VALID(sig), -EINVAL); |
da7e457c | 1151 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1152 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1153 | |
59bc1fd7 LP |
1154 | if (!callback) |
1155 | callback = signal_exit_callback; | |
1156 | ||
3022d74b | 1157 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
50e0d56c LP |
1158 | if (r != 0) |
1159 | return -r; | |
3022d74b LP |
1160 | |
1161 | if (!sigismember(&ss, sig)) | |
1162 | return -EBUSY; | |
1163 | ||
fd38203a LP |
1164 | if (!e->signal_sources) { |
1165 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1166 | if (!e->signal_sources) | |
1167 | return -ENOMEM; | |
1168 | } else if (e->signal_sources[sig]) | |
1169 | return -EBUSY; | |
1170 | ||
a71fe8b8 | 1171 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1172 | if (!s) |
1173 | return -ENOMEM; | |
1174 | ||
1175 | s->signal.sig = sig; | |
1176 | s->signal.callback = callback; | |
1177 | s->userdata = userdata; | |
baf76283 | 1178 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1179 | |
1180 | e->signal_sources[sig] = s; | |
fd38203a | 1181 | |
9da4cb2b LP |
1182 | r = event_make_signal_data(e, sig, &d); |
1183 | if (r < 0) { | |
1184 | source_free(s); | |
1185 | return r; | |
fd38203a LP |
1186 | } |
1187 | ||
f1f00dbb LP |
1188 | /* Use the signal name as description for the event source by default */ |
1189 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1190 | ||
a71fe8b8 LP |
1191 | if (ret) |
1192 | *ret = s; | |
1193 | ||
fd38203a LP |
1194 | return 0; |
1195 | } | |
1196 | ||
f7262a9f | 1197 | _public_ int sd_event_add_child( |
305f78bf | 1198 | sd_event *e, |
151b9b96 | 1199 | sd_event_source **ret, |
305f78bf LP |
1200 | pid_t pid, |
1201 | int options, | |
718db961 | 1202 | sd_event_child_handler_t callback, |
151b9b96 | 1203 | void *userdata) { |
305f78bf | 1204 | |
fd38203a LP |
1205 | sd_event_source *s; |
1206 | int r; | |
1207 | ||
305f78bf LP |
1208 | assert_return(e, -EINVAL); |
1209 | assert_return(pid > 1, -EINVAL); | |
1210 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1211 | assert_return(options != 0, -EINVAL); | |
1212 | assert_return(callback, -EINVAL); | |
da7e457c | 1213 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1214 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1215 | |
d5099efc | 1216 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1217 | if (r < 0) |
1218 | return r; | |
1219 | ||
4a0b58c4 | 1220 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1221 | return -EBUSY; |
1222 | ||
a71fe8b8 | 1223 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1224 | if (!s) |
1225 | return -ENOMEM; | |
1226 | ||
1227 | s->child.pid = pid; | |
1228 | s->child.options = options; | |
1229 | s->child.callback = callback; | |
1230 | s->userdata = userdata; | |
baf76283 | 1231 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1232 | |
4a0b58c4 | 1233 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
fd38203a LP |
1234 | if (r < 0) { |
1235 | source_free(s); | |
1236 | return r; | |
1237 | } | |
1238 | ||
313cefa1 | 1239 | e->n_enabled_child_sources++; |
fd38203a | 1240 | |
9da4cb2b LP |
1241 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1242 | if (r < 0) { | |
1243 | e->n_enabled_child_sources--; | |
1244 | source_free(s); | |
1245 | return r; | |
fd38203a LP |
1246 | } |
1247 | ||
c2ba3ad6 LP |
1248 | e->need_process_child = true; |
1249 | ||
a71fe8b8 LP |
1250 | if (ret) |
1251 | *ret = s; | |
1252 | ||
fd38203a LP |
1253 | return 0; |
1254 | } | |
1255 | ||
f7262a9f | 1256 | _public_ int sd_event_add_defer( |
305f78bf | 1257 | sd_event *e, |
151b9b96 | 1258 | sd_event_source **ret, |
718db961 | 1259 | sd_event_handler_t callback, |
151b9b96 | 1260 | void *userdata) { |
305f78bf | 1261 | |
fd38203a LP |
1262 | sd_event_source *s; |
1263 | int r; | |
1264 | ||
305f78bf LP |
1265 | assert_return(e, -EINVAL); |
1266 | assert_return(callback, -EINVAL); | |
da7e457c | 1267 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1268 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1269 | |
a71fe8b8 | 1270 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1271 | if (!s) |
1272 | return -ENOMEM; | |
1273 | ||
1274 | s->defer.callback = callback; | |
1275 | s->userdata = userdata; | |
baf76283 | 1276 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1277 | |
1278 | r = source_set_pending(s, true); | |
1279 | if (r < 0) { | |
1280 | source_free(s); | |
1281 | return r; | |
1282 | } | |
1283 | ||
a71fe8b8 LP |
1284 | if (ret) |
1285 | *ret = s; | |
1286 | ||
fd38203a LP |
1287 | return 0; |
1288 | } | |
1289 | ||
6e9feda3 LP |
1290 | _public_ int sd_event_add_post( |
1291 | sd_event *e, | |
1292 | sd_event_source **ret, | |
1293 | sd_event_handler_t callback, | |
1294 | void *userdata) { | |
1295 | ||
1296 | sd_event_source *s; | |
1297 | int r; | |
1298 | ||
1299 | assert_return(e, -EINVAL); | |
1300 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1301 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1302 | assert_return(!event_pid_changed(e), -ECHILD); | |
1303 | ||
d5099efc | 1304 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1305 | if (r < 0) |
1306 | return r; | |
1307 | ||
a71fe8b8 | 1308 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1309 | if (!s) |
1310 | return -ENOMEM; | |
1311 | ||
1312 | s->post.callback = callback; | |
1313 | s->userdata = userdata; | |
1314 | s->enabled = SD_EVENT_ON; | |
1315 | ||
1316 | r = set_put(e->post_sources, s); | |
1317 | if (r < 0) { | |
1318 | source_free(s); | |
1319 | return r; | |
1320 | } | |
1321 | ||
a71fe8b8 LP |
1322 | if (ret) |
1323 | *ret = s; | |
1324 | ||
6e9feda3 LP |
1325 | return 0; |
1326 | } | |
1327 | ||
6203e07a | 1328 | _public_ int sd_event_add_exit( |
305f78bf | 1329 | sd_event *e, |
151b9b96 | 1330 | sd_event_source **ret, |
718db961 | 1331 | sd_event_handler_t callback, |
151b9b96 | 1332 | void *userdata) { |
305f78bf | 1333 | |
da7e457c LP |
1334 | sd_event_source *s; |
1335 | int r; | |
1336 | ||
1337 | assert_return(e, -EINVAL); | |
1338 | assert_return(callback, -EINVAL); | |
1339 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1340 | assert_return(!event_pid_changed(e), -ECHILD); | |
1341 | ||
c983e776 EV |
1342 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1343 | if (r < 0) | |
1344 | return r; | |
da7e457c | 1345 | |
a71fe8b8 | 1346 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1347 | if (!s) |
da7e457c | 1348 | return -ENOMEM; |
fd38203a | 1349 | |
6203e07a | 1350 | s->exit.callback = callback; |
da7e457c | 1351 | s->userdata = userdata; |
6203e07a | 1352 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1353 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1354 | |
6203e07a | 1355 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1356 | if (r < 0) { |
1357 | source_free(s); | |
1358 | return r; | |
1359 | } | |
1360 | ||
a71fe8b8 LP |
1361 | if (ret) |
1362 | *ret = s; | |
1363 | ||
da7e457c LP |
1364 | return 0; |
1365 | } | |
1366 | ||
f7262a9f | 1367 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
6680dd6b LP |
1368 | |
1369 | if (!s) | |
1370 | return NULL; | |
da7e457c LP |
1371 | |
1372 | assert(s->n_ref >= 1); | |
1373 | s->n_ref++; | |
fd38203a LP |
1374 | |
1375 | return s; | |
1376 | } | |
1377 | ||
f7262a9f | 1378 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1379 | |
1380 | if (!s) | |
1381 | return NULL; | |
fd38203a | 1382 | |
da7e457c LP |
1383 | assert(s->n_ref >= 1); |
1384 | s->n_ref--; | |
1385 | ||
12179984 LP |
1386 | if (s->n_ref <= 0) { |
1387 | /* Here's a special hack: when we are called from a | |
1388 | * dispatch handler we won't free the event source | |
1389 | * immediately, but we will detach the fd from the | |
1390 | * epoll. This way it is safe for the caller to unref | |
1391 | * the event source and immediately close the fd, but | |
1392 | * we still retain a valid event source object after | |
1393 | * the callback. */ | |
1394 | ||
1395 | if (s->dispatching) { | |
1396 | if (s->type == SOURCE_IO) | |
1397 | source_io_unregister(s); | |
a71fe8b8 LP |
1398 | |
1399 | source_disconnect(s); | |
12179984 LP |
1400 | } else |
1401 | source_free(s); | |
1402 | } | |
fd38203a LP |
1403 | |
1404 | return NULL; | |
1405 | } | |
1406 | ||
356779df | 1407 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1408 | assert_return(s, -EINVAL); |
f4b2933e | 1409 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1410 | |
356779df | 1411 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1412 | } |
1413 | ||
356779df | 1414 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1415 | assert_return(s, -EINVAL); |
356779df | 1416 | assert_return(description, -EINVAL); |
f4b2933e LP |
1417 | assert_return(s->description, -ENXIO); |
1418 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
f7f53e9e | 1419 | |
356779df | 1420 | *description = s->description; |
f7f53e9e TG |
1421 | return 0; |
1422 | } | |
1423 | ||
adcc4ca3 | 1424 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1425 | assert_return(s, NULL); |
eaa3cbef LP |
1426 | |
1427 | return s->event; | |
1428 | } | |
1429 | ||
f7262a9f | 1430 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1431 | assert_return(s, -EINVAL); |
6203e07a | 1432 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1433 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1434 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1435 | |
1436 | return s->pending; | |
1437 | } | |
1438 | ||
f7262a9f | 1439 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1440 | assert_return(s, -EINVAL); |
1441 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1442 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1443 | |
1444 | return s->io.fd; | |
1445 | } | |
1446 | ||
30caf8f3 LP |
1447 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1448 | int r; | |
1449 | ||
1450 | assert_return(s, -EINVAL); | |
8ac43fee | 1451 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1452 | assert_return(s->type == SOURCE_IO, -EDOM); |
1453 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1454 | ||
1455 | if (s->io.fd == fd) | |
1456 | return 0; | |
1457 | ||
1458 | if (s->enabled == SD_EVENT_OFF) { | |
1459 | s->io.fd = fd; | |
1460 | s->io.registered = false; | |
1461 | } else { | |
1462 | int saved_fd; | |
1463 | ||
1464 | saved_fd = s->io.fd; | |
1465 | assert(s->io.registered); | |
1466 | ||
1467 | s->io.fd = fd; | |
1468 | s->io.registered = false; | |
1469 | ||
1470 | r = source_io_register(s, s->enabled, s->io.events); | |
1471 | if (r < 0) { | |
1472 | s->io.fd = saved_fd; | |
1473 | s->io.registered = true; | |
1474 | return r; | |
1475 | } | |
1476 | ||
1477 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1478 | } | |
1479 | ||
1480 | return 0; | |
1481 | } | |
1482 | ||
f7262a9f | 1483 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1484 | assert_return(s, -EINVAL); |
1485 | assert_return(events, -EINVAL); | |
1486 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1487 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1488 | |
1489 | *events = s->io.events; | |
1490 | return 0; | |
1491 | } | |
1492 | ||
f7262a9f | 1493 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1494 | int r; |
1495 | ||
305f78bf LP |
1496 | assert_return(s, -EINVAL); |
1497 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1498 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1499 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1500 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1501 | |
b63c8d4f DH |
1502 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1503 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1504 | return 0; |
1505 | ||
baf76283 | 1506 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1507 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1508 | if (r < 0) |
1509 | return r; | |
1510 | } | |
1511 | ||
1512 | s->io.events = events; | |
503f39c3 | 1513 | source_set_pending(s, false); |
fd38203a LP |
1514 | |
1515 | return 0; | |
1516 | } | |
1517 | ||
f7262a9f | 1518 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1519 | assert_return(s, -EINVAL); |
1520 | assert_return(revents, -EINVAL); | |
1521 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1522 | assert_return(s->pending, -ENODATA); | |
1523 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1524 | |
1525 | *revents = s->io.revents; | |
1526 | return 0; | |
1527 | } | |
1528 | ||
f7262a9f | 1529 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1530 | assert_return(s, -EINVAL); |
1531 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1532 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1533 | |
1534 | return s->signal.sig; | |
1535 | } | |
1536 | ||
31927c16 | 1537 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1538 | assert_return(s, -EINVAL); |
1539 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1540 | |
6680b8d1 ME |
1541 | *priority = s->priority; |
1542 | return 0; | |
fd38203a LP |
1543 | } |
1544 | ||
31927c16 | 1545 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
9da4cb2b LP |
1546 | int r; |
1547 | ||
305f78bf | 1548 | assert_return(s, -EINVAL); |
da7e457c | 1549 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1550 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1551 | |
1552 | if (s->priority == priority) | |
1553 | return 0; | |
1554 | ||
9da4cb2b LP |
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; | |
fd38203a LP |
1574 | |
1575 | if (s->pending) | |
c2ba3ad6 | 1576 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1577 | |
1578 | if (s->prepare) | |
c2ba3ad6 | 1579 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1580 | |
6203e07a LP |
1581 | if (s->type == SOURCE_EXIT) |
1582 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1583 | |
fd38203a LP |
1584 | return 0; |
1585 | } | |
1586 | ||
f7262a9f | 1587 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1588 | assert_return(s, -EINVAL); |
1589 | assert_return(m, -EINVAL); | |
1590 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1591 | |
baf76283 | 1592 | *m = s->enabled; |
fd38203a LP |
1593 | return 0; |
1594 | } | |
1595 | ||
f7262a9f | 1596 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1597 | int r; |
1598 | ||
305f78bf | 1599 | assert_return(s, -EINVAL); |
945c2931 | 1600 | assert_return(IN_SET(m, SD_EVENT_OFF, SD_EVENT_ON, SD_EVENT_ONESHOT), -EINVAL); |
305f78bf | 1601 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1602 | |
cc567911 LP |
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 | ||
baf76283 | 1608 | if (s->enabled == m) |
fd38203a LP |
1609 | return 0; |
1610 | ||
baf76283 | 1611 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1612 | |
1613 | switch (s->type) { | |
1614 | ||
1615 | case SOURCE_IO: | |
366e6411 | 1616 | source_io_unregister(s); |
baf76283 | 1617 | s->enabled = m; |
fd38203a LP |
1618 | break; |
1619 | ||
6a0f1f6d | 1620 | case SOURCE_TIME_REALTIME: |
a8548816 | 1621 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1622 | case SOURCE_TIME_MONOTONIC: |
1623 | case SOURCE_TIME_REALTIME_ALARM: | |
1624 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1625 | struct clock_data *d; | |
fd38203a | 1626 | |
baf76283 | 1627 | s->enabled = m; |
6a0f1f6d LP |
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); | |
212bbb17 | 1633 | d->needs_rearm = true; |
fd38203a | 1634 | break; |
6a0f1f6d | 1635 | } |
fd38203a LP |
1636 | |
1637 | case SOURCE_SIGNAL: | |
baf76283 | 1638 | s->enabled = m; |
4807d2d0 | 1639 | |
9da4cb2b | 1640 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
fd38203a LP |
1641 | break; |
1642 | ||
1643 | case SOURCE_CHILD: | |
baf76283 | 1644 | s->enabled = m; |
fd38203a | 1645 | |
baf76283 LP |
1646 | assert(s->event->n_enabled_child_sources > 0); |
1647 | s->event->n_enabled_child_sources--; | |
fd38203a | 1648 | |
9da4cb2b | 1649 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
fd38203a LP |
1650 | break; |
1651 | ||
6203e07a | 1652 | case SOURCE_EXIT: |
305f78bf | 1653 | s->enabled = m; |
6203e07a | 1654 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1655 | break; |
1656 | ||
1657 | case SOURCE_DEFER: | |
6e9feda3 | 1658 | case SOURCE_POST: |
baf76283 | 1659 | s->enabled = m; |
fd38203a | 1660 | break; |
9d3e3aa5 | 1661 | |
6a0f1f6d | 1662 | default: |
9d3e3aa5 | 1663 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
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 | ||
baf76283 | 1674 | s->enabled = m; |
fd38203a LP |
1675 | break; |
1676 | ||
6a0f1f6d | 1677 | case SOURCE_TIME_REALTIME: |
a8548816 | 1678 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1679 | case SOURCE_TIME_MONOTONIC: |
1680 | case SOURCE_TIME_REALTIME_ALARM: | |
1681 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1682 | struct clock_data *d; | |
fd38203a | 1683 | |
baf76283 | 1684 | s->enabled = m; |
6a0f1f6d LP |
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); | |
212bbb17 | 1690 | d->needs_rearm = true; |
fd38203a | 1691 | break; |
6a0f1f6d | 1692 | } |
fd38203a LP |
1693 | |
1694 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1695 | |
1696 | s->enabled = m; | |
9da4cb2b LP |
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 | ||
fd38203a LP |
1705 | break; |
1706 | ||
1707 | case SOURCE_CHILD: | |
4807d2d0 | 1708 | |
9da4cb2b | 1709 | if (s->enabled == SD_EVENT_OFF) |
4807d2d0 | 1710 | s->event->n_enabled_child_sources++; |
7a0d4a3d DH |
1711 | |
1712 | s->enabled = m; | |
9da4cb2b | 1713 | |
10edebf6 | 1714 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
9da4cb2b LP |
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 | ||
fd38203a LP |
1722 | break; |
1723 | ||
6203e07a | 1724 | case SOURCE_EXIT: |
305f78bf | 1725 | s->enabled = m; |
6203e07a | 1726 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1727 | break; |
1728 | ||
1729 | case SOURCE_DEFER: | |
6e9feda3 | 1730 | case SOURCE_POST: |
baf76283 | 1731 | s->enabled = m; |
fd38203a | 1732 | break; |
9d3e3aa5 | 1733 | |
6a0f1f6d | 1734 | default: |
9d3e3aa5 | 1735 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
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 | ||
f7262a9f | 1748 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1749 | assert_return(s, -EINVAL); |
1750 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1751 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1752 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1753 | |
1754 | *usec = s->time.next; | |
1755 | return 0; | |
1756 | } | |
1757 | ||
f7262a9f | 1758 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1759 | struct clock_data *d; |
1760 | ||
305f78bf | 1761 | assert_return(s, -EINVAL); |
6a0f1f6d | 1762 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1763 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1764 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1765 | |
fd38203a | 1766 | s->time.next = usec; |
2576a19e | 1767 | |
0cc1125a | 1768 | source_set_pending(s, false); |
fd38203a | 1769 | |
6a0f1f6d LP |
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); | |
212bbb17 | 1775 | d->needs_rearm = true; |
fd38203a LP |
1776 | |
1777 | return 0; | |
1778 | } | |
1779 | ||
f7262a9f | 1780 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1781 | assert_return(s, -EINVAL); |
1782 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1783 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1784 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1785 | ||
1786 | *usec = s->time.accuracy; | |
1787 | return 0; | |
1788 | } | |
1789 | ||
f7262a9f | 1790 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1791 | struct clock_data *d; |
1792 | ||
305f78bf LP |
1793 | assert_return(s, -EINVAL); |
1794 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1795 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1796 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1797 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1798 | |
1799 | if (usec == 0) | |
1800 | usec = DEFAULT_ACCURACY_USEC; | |
1801 | ||
eaa3cbef LP |
1802 | s->time.accuracy = usec; |
1803 | ||
2576a19e LP |
1804 | source_set_pending(s, false); |
1805 | ||
6a0f1f6d LP |
1806 | d = event_get_clock_data(s->event, s->type); |
1807 | assert(d); | |
1808 | ||
1809 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1810 | d->needs_rearm = true; |
6a0f1f6d LP |
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); | |
eaa3cbef | 1820 | |
6a0f1f6d | 1821 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1822 | return 0; |
1823 | } | |
1824 | ||
f7262a9f | 1825 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
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 | ||
718db961 | 1835 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1836 | int r; |
1837 | ||
da7e457c | 1838 | assert_return(s, -EINVAL); |
6203e07a | 1839 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1840 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1841 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
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 | ||
f7262a9f | 1867 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1868 | assert_return(s, NULL); |
fd38203a LP |
1869 | |
1870 | return s->userdata; | |
1871 | } | |
1872 | ||
8f726607 LP |
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 | ||
c2ba3ad6 LP |
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; | |
393003e1 LP |
1891 | if (a >= USEC_INFINITY) |
1892 | return USEC_INFINITY; | |
c2ba3ad6 LP |
1893 | |
1894 | if (b <= a + 1) | |
1895 | return a; | |
1896 | ||
52444dc4 LP |
1897 | initialize_perturb(e); |
1898 | ||
c2ba3ad6 LP |
1899 | /* |
1900 | Find a good time to wake up again between times a and b. We | |
1901 | have two goals here: | |
1902 | ||
1903 | a) We want to wake up as seldom as possible, hence prefer | |
1904 | later times over earlier times. | |
1905 | ||
1906 | b) But if we have to wake up, then let's make sure to | |
1907 | dispatch as much as possible on the entire system. | |
1908 | ||
1909 | We implement this by waking up everywhere at the same time | |
850516e0 | 1910 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1911 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1912 | then we try to find the same spot in every 10s, then 1s and |
1913 | then 250ms step. Otherwise, we pick the last possible time | |
1914 | to wake up. | |
c2ba3ad6 LP |
1915 | */ |
1916 | ||
850516e0 LP |
1917 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1918 | if (c >= b) { | |
1919 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1920 | return b; | |
1921 | ||
1922 | c -= USEC_PER_MINUTE; | |
1923 | } | |
1924 | ||
ba276c81 LP |
1925 | if (c >= a) |
1926 | return c; | |
1927 | ||
1928 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1929 | if (c >= b) { | |
1930 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1931 | return b; | |
1932 | ||
1933 | c -= USEC_PER_SEC*10; | |
1934 | } | |
1935 | ||
850516e0 LP |
1936 | if (c >= a) |
1937 | return c; | |
1938 | ||
1939 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1940 | if (c >= b) { |
1941 | if (_unlikely_(c < USEC_PER_SEC)) | |
1942 | return b; | |
1943 | ||
1944 | c -= USEC_PER_SEC; | |
1945 | } | |
1946 | ||
1947 | if (c >= a) | |
1948 | return c; | |
1949 | ||
1950 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1951 | if (c >= b) { | |
1952 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1953 | return b; | |
1954 | ||
1955 | c -= USEC_PER_MSEC*250; | |
1956 | } | |
1957 | ||
1958 | if (c >= a) | |
1959 | return c; | |
1960 | ||
1961 | return b; | |
1962 | } | |
1963 | ||
fd38203a LP |
1964 | static int event_arm_timer( |
1965 | sd_event *e, | |
6a0f1f6d | 1966 | struct clock_data *d) { |
fd38203a LP |
1967 | |
1968 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1969 | sd_event_source *a, *b; |
1970 | usec_t t; | |
fd38203a LP |
1971 | int r; |
1972 | ||
cde93897 | 1973 | assert(e); |
6a0f1f6d | 1974 | assert(d); |
fd38203a | 1975 | |
d06441da | 1976 | if (!d->needs_rearm) |
212bbb17 TG |
1977 | return 0; |
1978 | else | |
1979 | d->needs_rearm = false; | |
1980 | ||
6a0f1f6d | 1981 | a = prioq_peek(d->earliest); |
393003e1 | 1982 | if (!a || a->enabled == SD_EVENT_OFF || a->time.next == USEC_INFINITY) { |
72aedc1e | 1983 | |
6a0f1f6d | 1984 | if (d->fd < 0) |
c57b5ca3 LP |
1985 | return 0; |
1986 | ||
3a43da28 | 1987 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
1988 | return 0; |
1989 | ||
1990 | /* disarm */ | |
6a0f1f6d | 1991 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1992 | if (r < 0) |
1993 | return r; | |
1994 | ||
3a43da28 | 1995 | d->next = USEC_INFINITY; |
fd38203a | 1996 | return 0; |
72aedc1e | 1997 | } |
fd38203a | 1998 | |
6a0f1f6d | 1999 | b = prioq_peek(d->latest); |
baf76283 | 2000 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 | 2001 | |
1bce0ffa | 2002 | t = sleep_between(e, a->time.next, time_event_source_latest(b)); |
6a0f1f6d | 2003 | if (d->next == t) |
fd38203a LP |
2004 | return 0; |
2005 | ||
6a0f1f6d | 2006 | assert_se(d->fd >= 0); |
fd38203a | 2007 | |
c2ba3ad6 | 2008 | if (t == 0) { |
fd38203a LP |
2009 | /* We don' want to disarm here, just mean some time looooong ago. */ |
2010 | its.it_value.tv_sec = 0; | |
2011 | its.it_value.tv_nsec = 1; | |
2012 | } else | |
c2ba3ad6 | 2013 | timespec_store(&its.it_value, t); |
fd38203a | 2014 | |
6a0f1f6d | 2015 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 2016 | if (r < 0) |
cde93897 | 2017 | return -errno; |
fd38203a | 2018 | |
6a0f1f6d | 2019 | d->next = t; |
fd38203a LP |
2020 | return 0; |
2021 | } | |
2022 | ||
9a800b56 | 2023 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
2024 | assert(e); |
2025 | assert(s); | |
2026 | assert(s->type == SOURCE_IO); | |
2027 | ||
9a800b56 LP |
2028 | /* If the event source was already pending, we just OR in the |
2029 | * new revents, otherwise we reset the value. The ORing is | |
2030 | * necessary to handle EPOLLONESHOT events properly where | |
2031 | * readability might happen independently of writability, and | |
2032 | * we need to keep track of both */ | |
2033 | ||
2034 | if (s->pending) | |
2035 | s->io.revents |= revents; | |
2036 | else | |
2037 | s->io.revents = revents; | |
fd38203a | 2038 | |
fd38203a LP |
2039 | return source_set_pending(s, true); |
2040 | } | |
2041 | ||
72aedc1e | 2042 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2043 | uint64_t x; |
2044 | ssize_t ss; | |
2045 | ||
2046 | assert(e); | |
da7e457c | 2047 | assert(fd >= 0); |
72aedc1e | 2048 | |
305f78bf | 2049 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2050 | |
2051 | ss = read(fd, &x, sizeof(x)); | |
2052 | if (ss < 0) { | |
945c2931 | 2053 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
2054 | return 0; |
2055 | ||
2056 | return -errno; | |
2057 | } | |
2058 | ||
8d35dae7 | 2059 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2060 | return -EIO; |
2061 | ||
cde93897 | 2062 | if (next) |
3a43da28 | 2063 | *next = USEC_INFINITY; |
72aedc1e | 2064 | |
fd38203a LP |
2065 | return 0; |
2066 | } | |
2067 | ||
305f78bf LP |
2068 | static int process_timer( |
2069 | sd_event *e, | |
2070 | usec_t n, | |
6a0f1f6d | 2071 | struct clock_data *d) { |
305f78bf | 2072 | |
fd38203a LP |
2073 | sd_event_source *s; |
2074 | int r; | |
2075 | ||
2076 | assert(e); | |
6a0f1f6d | 2077 | assert(d); |
fd38203a LP |
2078 | |
2079 | for (;;) { | |
6a0f1f6d | 2080 | s = prioq_peek(d->earliest); |
fd38203a LP |
2081 | if (!s || |
2082 | s->time.next > n || | |
baf76283 | 2083 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2084 | s->pending) |
2085 | break; | |
2086 | ||
2087 | r = source_set_pending(s, true); | |
2088 | if (r < 0) | |
2089 | return r; | |
2090 | ||
6a0f1f6d LP |
2091 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2092 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 2093 | d->needs_rearm = true; |
fd38203a LP |
2094 | } |
2095 | ||
2096 | return 0; | |
2097 | } | |
2098 | ||
2099 | static int process_child(sd_event *e) { | |
2100 | sd_event_source *s; | |
2101 | Iterator i; | |
2102 | int r; | |
2103 | ||
2104 | assert(e); | |
2105 | ||
c2ba3ad6 LP |
2106 | e->need_process_child = false; |
2107 | ||
fd38203a LP |
2108 | /* |
2109 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2110 | + WNOHANG for each PID we wait for, instead of using | |
2111 | P_ALL. This is because we only want to get child | |
2112 | information of very specific child processes, and not all | |
2113 | of them. We might not have processed the SIGCHLD even of a | |
2114 | previous invocation and we don't want to maintain a | |
2115 | unbounded *per-child* event queue, hence we really don't | |
2116 | want anything flushed out of the kernel's queue that we | |
2117 | don't care about. Since this is O(n) this means that if you | |
2118 | have a lot of processes you probably want to handle SIGCHLD | |
2119 | yourself. | |
08cd1552 LP |
2120 | |
2121 | We do not reap the children here (by using WNOWAIT), this | |
2122 | is only done after the event source is dispatched so that | |
2123 | the callback still sees the process as a zombie. | |
fd38203a LP |
2124 | */ |
2125 | ||
2126 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2127 | assert(s->type == SOURCE_CHILD); | |
2128 | ||
2129 | if (s->pending) | |
2130 | continue; | |
2131 | ||
baf76283 | 2132 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2133 | continue; |
2134 | ||
2135 | zero(s->child.siginfo); | |
08cd1552 LP |
2136 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2137 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
2138 | if (r < 0) |
2139 | return -errno; | |
2140 | ||
2141 | if (s->child.siginfo.si_pid != 0) { | |
945c2931 | 2142 | bool zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 LP |
2143 | |
2144 | if (!zombie && (s->child.options & WEXITED)) { | |
2145 | /* If the child isn't dead then let's | |
2146 | * immediately remove the state change | |
2147 | * from the queue, since there's no | |
2148 | * benefit in leaving it queued */ | |
2149 | ||
2150 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2151 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2152 | } | |
2153 | ||
fd38203a LP |
2154 | r = source_set_pending(s, true); |
2155 | if (r < 0) | |
2156 | return r; | |
2157 | } | |
2158 | } | |
2159 | ||
fd38203a LP |
2160 | return 0; |
2161 | } | |
2162 | ||
9da4cb2b | 2163 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2164 | bool read_one = false; |
fd38203a LP |
2165 | int r; |
2166 | ||
da7e457c | 2167 | assert(e); |
305f78bf | 2168 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2169 | |
9da4cb2b LP |
2170 | /* If there's a signal queued on this priority and SIGCHLD is |
2171 | on this priority too, then make sure to recheck the | |
2172 | children we watch. This is because we only ever dequeue | |
2173 | the first signal per priority, and if we dequeue one, and | |
2174 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2175 | might have higher priority children we care about hence we | |
2176 | need to check that explicitly. */ | |
2177 | ||
2178 | if (sigismember(&d->sigset, SIGCHLD)) | |
2179 | e->need_process_child = true; | |
2180 | ||
2181 | /* If there's already an event source pending for this | |
2182 | * priority we don't read another */ | |
2183 | if (d->current) | |
2184 | return 0; | |
2185 | ||
fd38203a | 2186 | for (;;) { |
0eb2e0e3 | 2187 | struct signalfd_siginfo si; |
7057bd99 | 2188 | ssize_t n; |
92daebc0 | 2189 | sd_event_source *s = NULL; |
fd38203a | 2190 | |
9da4cb2b | 2191 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 2192 | if (n < 0) { |
945c2931 | 2193 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
2194 | return read_one; |
2195 | ||
2196 | return -errno; | |
2197 | } | |
2198 | ||
7057bd99 | 2199 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2200 | return -EIO; |
2201 | ||
6eb7c172 | 2202 | assert(SIGNAL_VALID(si.ssi_signo)); |
7057bd99 | 2203 | |
fd38203a LP |
2204 | read_one = true; |
2205 | ||
92daebc0 LP |
2206 | if (e->signal_sources) |
2207 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
2208 | if (!s) |
2209 | continue; | |
9da4cb2b LP |
2210 | if (s->pending) |
2211 | continue; | |
fd38203a LP |
2212 | |
2213 | s->signal.siginfo = si; | |
9da4cb2b LP |
2214 | d->current = s; |
2215 | ||
fd38203a LP |
2216 | r = source_set_pending(s, true); |
2217 | if (r < 0) | |
2218 | return r; | |
9da4cb2b LP |
2219 | |
2220 | return 1; | |
fd38203a | 2221 | } |
fd38203a LP |
2222 | } |
2223 | ||
2224 | static int source_dispatch(sd_event_source *s) { | |
8f5c235d | 2225 | EventSourceType saved_type; |
fe8245eb | 2226 | int r = 0; |
fd38203a LP |
2227 | |
2228 | assert(s); | |
6203e07a | 2229 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2230 | |
8f5c235d LP |
2231 | /* Save the event source type, here, so that we still know it after the event callback which might invalidate |
2232 | * the event. */ | |
2233 | saved_type = s->type; | |
2234 | ||
945c2931 | 2235 | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { |
da7e457c LP |
2236 | r = source_set_pending(s, false); |
2237 | if (r < 0) | |
2238 | return r; | |
2239 | } | |
fd38203a | 2240 | |
6e9feda3 LP |
2241 | if (s->type != SOURCE_POST) { |
2242 | sd_event_source *z; | |
2243 | Iterator i; | |
2244 | ||
2245 | /* If we execute a non-post source, let's mark all | |
2246 | * post sources as pending */ | |
2247 | ||
2248 | SET_FOREACH(z, s->event->post_sources, i) { | |
2249 | if (z->enabled == SD_EVENT_OFF) | |
2250 | continue; | |
2251 | ||
2252 | r = source_set_pending(z, true); | |
2253 | if (r < 0) | |
2254 | return r; | |
2255 | } | |
2256 | } | |
2257 | ||
baf76283 LP |
2258 | if (s->enabled == SD_EVENT_ONESHOT) { |
2259 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2260 | if (r < 0) |
2261 | return r; | |
2262 | } | |
2263 | ||
12179984 | 2264 | s->dispatching = true; |
b7484e2a | 2265 | |
fd38203a LP |
2266 | switch (s->type) { |
2267 | ||
2268 | case SOURCE_IO: | |
2269 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2270 | break; | |
2271 | ||
6a0f1f6d | 2272 | case SOURCE_TIME_REALTIME: |
a8548816 | 2273 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2274 | case SOURCE_TIME_MONOTONIC: |
2275 | case SOURCE_TIME_REALTIME_ALARM: | |
2276 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2277 | r = s->time.callback(s, s->time.next, s->userdata); |
2278 | break; | |
2279 | ||
2280 | case SOURCE_SIGNAL: | |
2281 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2282 | break; | |
2283 | ||
08cd1552 LP |
2284 | case SOURCE_CHILD: { |
2285 | bool zombie; | |
2286 | ||
945c2931 | 2287 | zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 | 2288 | |
fd38203a | 2289 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2290 | |
2291 | /* Now, reap the PID for good. */ | |
2292 | if (zombie) | |
2293 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2294 | ||
fd38203a | 2295 | break; |
08cd1552 | 2296 | } |
fd38203a LP |
2297 | |
2298 | case SOURCE_DEFER: | |
2299 | r = s->defer.callback(s, s->userdata); | |
2300 | break; | |
da7e457c | 2301 | |
6e9feda3 LP |
2302 | case SOURCE_POST: |
2303 | r = s->post.callback(s, s->userdata); | |
2304 | break; | |
2305 | ||
6203e07a LP |
2306 | case SOURCE_EXIT: |
2307 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2308 | break; |
9d3e3aa5 LP |
2309 | |
2310 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2311 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2312 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2313 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2314 | } |
2315 | ||
12179984 LP |
2316 | s->dispatching = false; |
2317 | ||
55cbfaa5 DM |
2318 | if (r < 0) |
2319 | log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m", | |
8f5c235d | 2320 | strna(s->description), event_source_type_to_string(saved_type)); |
12179984 LP |
2321 | |
2322 | if (s->n_ref == 0) | |
2323 | source_free(s); | |
2324 | else if (r < 0) | |
6203e07a | 2325 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2326 | |
6203e07a | 2327 | return 1; |
fd38203a LP |
2328 | } |
2329 | ||
2330 | static int event_prepare(sd_event *e) { | |
2331 | int r; | |
2332 | ||
2333 | assert(e); | |
2334 | ||
2335 | for (;;) { | |
2336 | sd_event_source *s; | |
2337 | ||
2338 | s = prioq_peek(e->prepare); | |
baf76283 | 2339 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2340 | break; |
2341 | ||
2342 | s->prepare_iteration = e->iteration; | |
2343 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2344 | if (r < 0) | |
2345 | return r; | |
2346 | ||
2347 | assert(s->prepare); | |
12179984 LP |
2348 | |
2349 | s->dispatching = true; | |
fd38203a | 2350 | r = s->prepare(s, s->userdata); |
12179984 LP |
2351 | s->dispatching = false; |
2352 | ||
55cbfaa5 DM |
2353 | if (r < 0) |
2354 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m", | |
2355 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a | 2356 | |
12179984 LP |
2357 | if (s->n_ref == 0) |
2358 | source_free(s); | |
2359 | else if (r < 0) | |
2360 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2361 | } |
2362 | ||
2363 | return 0; | |
2364 | } | |
2365 | ||
6203e07a | 2366 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2367 | sd_event_source *p; |
2368 | int r; | |
2369 | ||
2370 | assert(e); | |
2371 | ||
6203e07a | 2372 | p = prioq_peek(e->exit); |
baf76283 | 2373 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2374 | e->state = SD_EVENT_FINISHED; |
2375 | return 0; | |
2376 | } | |
2377 | ||
2378 | sd_event_ref(e); | |
2379 | e->iteration++; | |
6203e07a | 2380 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2381 | |
2382 | r = source_dispatch(p); | |
2383 | ||
2b0c9ef7 | 2384 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2385 | sd_event_unref(e); |
2386 | ||
2387 | return r; | |
2388 | } | |
2389 | ||
c2ba3ad6 LP |
2390 | static sd_event_source* event_next_pending(sd_event *e) { |
2391 | sd_event_source *p; | |
2392 | ||
da7e457c LP |
2393 | assert(e); |
2394 | ||
c2ba3ad6 LP |
2395 | p = prioq_peek(e->pending); |
2396 | if (!p) | |
2397 | return NULL; | |
2398 | ||
baf76283 | 2399 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2400 | return NULL; |
2401 | ||
2402 | return p; | |
2403 | } | |
2404 | ||
cde93897 LP |
2405 | static int arm_watchdog(sd_event *e) { |
2406 | struct itimerspec its = {}; | |
2407 | usec_t t; | |
2408 | int r; | |
2409 | ||
2410 | assert(e); | |
2411 | assert(e->watchdog_fd >= 0); | |
2412 | ||
2413 | t = sleep_between(e, | |
2414 | e->watchdog_last + (e->watchdog_period / 2), | |
2415 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2416 | ||
2417 | timespec_store(&its.it_value, t); | |
2418 | ||
75145780 LP |
2419 | /* Make sure we never set the watchdog to 0, which tells the |
2420 | * kernel to disable it. */ | |
2421 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2422 | its.it_value.tv_nsec = 1; | |
2423 | ||
cde93897 LP |
2424 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2425 | if (r < 0) | |
2426 | return -errno; | |
2427 | ||
2428 | return 0; | |
2429 | } | |
2430 | ||
2431 | static int process_watchdog(sd_event *e) { | |
2432 | assert(e); | |
2433 | ||
2434 | if (!e->watchdog) | |
2435 | return 0; | |
2436 | ||
2437 | /* Don't notify watchdog too often */ | |
2438 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2439 | return 0; | |
2440 | ||
2441 | sd_notify(false, "WATCHDOG=1"); | |
2442 | e->watchdog_last = e->timestamp.monotonic; | |
2443 | ||
2444 | return arm_watchdog(e); | |
2445 | } | |
2446 | ||
c45a5a74 TG |
2447 | _public_ int sd_event_prepare(sd_event *e) { |
2448 | int r; | |
fd38203a | 2449 | |
da7e457c LP |
2450 | assert_return(e, -EINVAL); |
2451 | assert_return(!event_pid_changed(e), -ECHILD); | |
2452 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2453 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 2454 | |
6203e07a | 2455 | if (e->exit_requested) |
c45a5a74 | 2456 | goto pending; |
fd38203a LP |
2457 | |
2458 | e->iteration++; | |
2459 | ||
0be6c2f6 | 2460 | e->state = SD_EVENT_PREPARING; |
fd38203a | 2461 | r = event_prepare(e); |
0be6c2f6 | 2462 | e->state = SD_EVENT_INITIAL; |
fd38203a | 2463 | if (r < 0) |
c45a5a74 | 2464 | return r; |
fd38203a | 2465 | |
6a0f1f6d LP |
2466 | r = event_arm_timer(e, &e->realtime); |
2467 | if (r < 0) | |
c45a5a74 | 2468 | return r; |
6a0f1f6d | 2469 | |
a8548816 TG |
2470 | r = event_arm_timer(e, &e->boottime); |
2471 | if (r < 0) | |
c45a5a74 | 2472 | return r; |
a8548816 | 2473 | |
6a0f1f6d LP |
2474 | r = event_arm_timer(e, &e->monotonic); |
2475 | if (r < 0) | |
c45a5a74 | 2476 | return r; |
6a0f1f6d LP |
2477 | |
2478 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 2479 | if (r < 0) |
c45a5a74 | 2480 | return r; |
fd38203a | 2481 | |
6a0f1f6d | 2482 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 2483 | if (r < 0) |
c45a5a74 | 2484 | return r; |
fd38203a | 2485 | |
1b5995b0 | 2486 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
2487 | goto pending; |
2488 | ||
2b0c9ef7 | 2489 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
2490 | |
2491 | return 0; | |
2492 | ||
2493 | pending: | |
2b0c9ef7 | 2494 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2495 | r = sd_event_wait(e, 0); |
2496 | if (r == 0) | |
2b0c9ef7 | 2497 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2498 | |
2499 | return r; | |
c45a5a74 TG |
2500 | } |
2501 | ||
2502 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2503 | struct epoll_event *ev_queue; | |
2504 | unsigned ev_queue_max; | |
2505 | int r, m, i; | |
2506 | ||
2507 | assert_return(e, -EINVAL); | |
2508 | assert_return(!event_pid_changed(e), -ECHILD); | |
2509 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2510 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
2511 | |
2512 | if (e->exit_requested) { | |
2513 | e->state = SD_EVENT_PENDING; | |
2514 | return 1; | |
2515 | } | |
6a0f1f6d | 2516 | |
1c724e9e | 2517 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 2518 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 2519 | |
15b38f93 | 2520 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2521 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2522 | if (m < 0) { |
c45a5a74 TG |
2523 | if (errno == EINTR) { |
2524 | e->state = SD_EVENT_PENDING; | |
2525 | return 1; | |
2526 | } | |
2527 | ||
2528 | r = -errno; | |
da7e457c LP |
2529 | goto finish; |
2530 | } | |
fd38203a | 2531 | |
e475d10c | 2532 | triple_timestamp_get(&e->timestamp); |
fd38203a LP |
2533 | |
2534 | for (i = 0; i < m; i++) { | |
2535 | ||
9da4cb2b | 2536 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2537 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
9da4cb2b LP |
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; | |
fd38203a | 2546 | |
9da4cb2b LP |
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 | } | |
fd38203a | 2561 | if (r < 0) |
da7e457c | 2562 | goto finish; |
fd38203a LP |
2563 | } |
2564 | ||
cde93897 LP |
2565 | r = process_watchdog(e); |
2566 | if (r < 0) | |
2567 | goto finish; | |
2568 | ||
6a0f1f6d LP |
2569 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2570 | if (r < 0) | |
2571 | goto finish; | |
2572 | ||
e475d10c | 2573 | r = process_timer(e, e->timestamp.boottime, &e->boottime); |
a8548816 TG |
2574 | if (r < 0) |
2575 | goto finish; | |
2576 | ||
6a0f1f6d LP |
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); | |
fd38203a | 2582 | if (r < 0) |
da7e457c | 2583 | goto finish; |
fd38203a | 2584 | |
e475d10c | 2585 | r = process_timer(e, e->timestamp.boottime, &e->boottime_alarm); |
fd38203a | 2586 | if (r < 0) |
da7e457c | 2587 | goto finish; |
fd38203a | 2588 | |
c2ba3ad6 | 2589 | if (e->need_process_child) { |
fd38203a LP |
2590 | r = process_child(e); |
2591 | if (r < 0) | |
da7e457c | 2592 | goto finish; |
fd38203a LP |
2593 | } |
2594 | ||
c45a5a74 TG |
2595 | if (event_next_pending(e)) { |
2596 | e->state = SD_EVENT_PENDING; | |
2597 | ||
2598 | return 1; | |
da7e457c LP |
2599 | } |
2600 | ||
c45a5a74 | 2601 | r = 0; |
fd38203a | 2602 | |
da7e457c | 2603 | finish: |
2b0c9ef7 | 2604 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2605 | |
2606 | return r; | |
fd38203a LP |
2607 | } |
2608 | ||
c45a5a74 TG |
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); | |
2b0c9ef7 | 2627 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2628 | |
2629 | sd_event_unref(e); | |
2630 | ||
2631 | return r; | |
2632 | } | |
2633 | ||
2b0c9ef7 | 2634 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2635 | |
2636 | return 1; | |
2637 | } | |
2638 | ||
34b87517 VC |
2639 | static void event_log_delays(sd_event *e) { |
2640 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1]; | |
34a6843d VC |
2641 | unsigned i; |
2642 | int o; | |
34b87517 VC |
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 | } | |
34a6843d | 2648 | log_debug("Event loop iterations: %.*s", o, b); |
34b87517 VC |
2649 | } |
2650 | ||
c45a5a74 TG |
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); | |
2b0c9ef7 | 2657 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 | 2658 | |
34b87517 VC |
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 | ||
c45a5a74 | 2675 | r = sd_event_prepare(e); |
53bac4e0 LP |
2676 | if (r == 0) |
2677 | /* There was nothing? Then wait... */ | |
2678 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 2679 | |
34b87517 VC |
2680 | if (e->profile_delays) |
2681 | e->last_run = now(CLOCK_MONOTONIC); | |
2682 | ||
02d30981 | 2683 | if (r > 0) { |
53bac4e0 | 2684 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
2685 | r = sd_event_dispatch(e); |
2686 | if (r < 0) | |
2687 | return r; | |
53bac4e0 LP |
2688 | |
2689 | return 1; | |
2690 | } | |
2691 | ||
2692 | return r; | |
c45a5a74 TG |
2693 | } |
2694 | ||
f7262a9f | 2695 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2696 | int r; |
2697 | ||
da7e457c LP |
2698 | assert_return(e, -EINVAL); |
2699 | assert_return(!event_pid_changed(e), -ECHILD); | |
2b0c9ef7 | 2700 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c LP |
2701 | |
2702 | sd_event_ref(e); | |
fd38203a | 2703 | |
da7e457c | 2704 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2705 | r = sd_event_run(e, (uint64_t) -1); |
2706 | if (r < 0) | |
da7e457c | 2707 | goto finish; |
fd38203a LP |
2708 | } |
2709 | ||
6203e07a | 2710 | r = e->exit_code; |
da7e457c LP |
2711 | |
2712 | finish: | |
2713 | sd_event_unref(e); | |
2714 | return r; | |
fd38203a LP |
2715 | } |
2716 | ||
9b364545 TG |
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 | ||
f7262a9f | 2725 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2726 | assert_return(e, -EINVAL); |
2727 | assert_return(!event_pid_changed(e), -ECHILD); | |
2728 | ||
2729 | return e->state; | |
2730 | } | |
2731 | ||
6203e07a | 2732 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2733 | assert_return(e, -EINVAL); |
6203e07a | 2734 | assert_return(code, -EINVAL); |
da7e457c | 2735 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2736 | |
6203e07a LP |
2737 | if (!e->exit_requested) |
2738 | return -ENODATA; | |
2739 | ||
2740 | *code = e->exit_code; | |
2741 | return 0; | |
fd38203a LP |
2742 | } |
2743 | ||
6203e07a | 2744 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2745 | assert_return(e, -EINVAL); |
2746 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2747 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2748 | |
6203e07a LP |
2749 | e->exit_requested = true; |
2750 | e->exit_code = code; | |
2751 | ||
fd38203a LP |
2752 | return 0; |
2753 | } | |
46e8c825 | 2754 | |
6a0f1f6d | 2755 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2756 | assert_return(e, -EINVAL); |
2757 | assert_return(usec, -EINVAL); | |
46e8c825 LP |
2758 | assert_return(!event_pid_changed(e), -ECHILD); |
2759 | ||
e475d10c LP |
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. */ | |
3411372e LP |
2766 | if (IN_SET(clock, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM) && !clock_boottime_supported()) |
2767 | return -EOPNOTSUPP; | |
2768 | ||
e475d10c | 2769 | if (!triple_timestamp_is_set(&e->timestamp)) { |
38a03f06 LP |
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 | } | |
46e8c825 | 2775 | |
e475d10c | 2776 | *usec = triple_timestamp_by_clock(&e->timestamp, clock); |
46e8c825 LP |
2777 | return 0; |
2778 | } | |
afc6adb5 LP |
2779 | |
2780 | _public_ int sd_event_default(sd_event **ret) { | |
2781 | ||
ec202eae | 2782 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2783 | sd_event *e = NULL; |
afc6adb5 LP |
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); | |
76b54375 | 2809 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2810 | |
76b54375 LP |
2811 | if (e->tid != 0) { |
2812 | *tid = e->tid; | |
2813 | return 0; | |
2814 | } | |
2815 | ||
2816 | return -ENXIO; | |
afc6adb5 | 2817 | } |
cde93897 LP |
2818 | |
2819 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2820 | int r; | |
2821 | ||
2822 | assert_return(e, -EINVAL); | |
8f726607 | 2823 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2824 | |
2825 | if (e->watchdog == !!b) | |
2826 | return e->watchdog; | |
2827 | ||
2828 | if (b) { | |
2829 | struct epoll_event ev = {}; | |
cde93897 | 2830 | |
09812eb7 LP |
2831 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2832 | if (r <= 0) | |
cde93897 | 2833 | return r; |
cde93897 LP |
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); | |
03e334a1 | 2859 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2860 | } |
2861 | } | |
2862 | ||
2863 | e->watchdog = !!b; | |
2864 | return e->watchdog; | |
2865 | ||
2866 | fail: | |
03e334a1 | 2867 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2868 | return r; |
2869 | } | |
8f726607 LP |
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 | } | |
60a3b1e1 LP |
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 | } |