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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
fd38203a LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <sys/epoll.h> | |
22 | #include <sys/timerfd.h> | |
23 | #include <sys/wait.h> | |
24 | ||
cde93897 | 25 | #include "sd-daemon.h" |
07630cea LP |
26 | #include "sd-event.h" |
27 | #include "sd-id128.h" | |
28 | ||
b5efdb8a | 29 | #include "alloc-util.h" |
3ffd4af2 | 30 | #include "fd-util.h" |
fd38203a | 31 | #include "hashmap.h" |
07630cea LP |
32 | #include "list.h" |
33 | #include "macro.h" | |
afc6adb5 | 34 | #include "missing.h" |
07630cea | 35 | #include "prioq.h" |
4a0b58c4 | 36 | #include "process-util.h" |
6e9feda3 | 37 | #include "set.h" |
24882e06 | 38 | #include "signal-util.h" |
55cbfaa5 | 39 | #include "string-table.h" |
07630cea LP |
40 | #include "string-util.h" |
41 | #include "time-util.h" | |
42 | #include "util.h" | |
fd38203a | 43 | |
c2ba3ad6 | 44 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
45 | |
46 | typedef enum EventSourceType { | |
47 | SOURCE_IO, | |
6a0f1f6d | 48 | SOURCE_TIME_REALTIME, |
a8548816 | 49 | SOURCE_TIME_BOOTTIME, |
6a0f1f6d LP |
50 | SOURCE_TIME_MONOTONIC, |
51 | SOURCE_TIME_REALTIME_ALARM, | |
52 | SOURCE_TIME_BOOTTIME_ALARM, | |
fd38203a LP |
53 | SOURCE_SIGNAL, |
54 | SOURCE_CHILD, | |
da7e457c | 55 | SOURCE_DEFER, |
6e9feda3 | 56 | SOURCE_POST, |
6203e07a | 57 | SOURCE_EXIT, |
6a0f1f6d | 58 | SOURCE_WATCHDOG, |
a71fe8b8 | 59 | _SOURCE_EVENT_SOURCE_TYPE_MAX, |
6a0f1f6d | 60 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 |
fd38203a LP |
61 | } EventSourceType; |
62 | ||
55cbfaa5 DM |
63 | static const char* const event_source_type_table[_SOURCE_EVENT_SOURCE_TYPE_MAX] = { |
64 | [SOURCE_IO] = "io", | |
65 | [SOURCE_TIME_REALTIME] = "realtime", | |
66 | [SOURCE_TIME_BOOTTIME] = "bootime", | |
67 | [SOURCE_TIME_MONOTONIC] = "monotonic", | |
68 | [SOURCE_TIME_REALTIME_ALARM] = "realtime-alarm", | |
69 | [SOURCE_TIME_BOOTTIME_ALARM] = "boottime-alarm", | |
70 | [SOURCE_SIGNAL] = "signal", | |
71 | [SOURCE_CHILD] = "child", | |
72 | [SOURCE_DEFER] = "defer", | |
73 | [SOURCE_POST] = "post", | |
74 | [SOURCE_EXIT] = "exit", | |
75 | [SOURCE_WATCHDOG] = "watchdog", | |
76 | }; | |
77 | ||
78 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(event_source_type, int); | |
79 | ||
9da4cb2b LP |
80 | /* All objects we use in epoll events start with this value, so that |
81 | * we know how to dispatch it */ | |
82 | typedef enum WakeupType { | |
83 | WAKEUP_NONE, | |
84 | WAKEUP_EVENT_SOURCE, | |
85 | WAKEUP_CLOCK_DATA, | |
86 | WAKEUP_SIGNAL_DATA, | |
87 | _WAKEUP_TYPE_MAX, | |
88 | _WAKEUP_TYPE_INVALID = -1, | |
89 | } WakeupType; | |
90 | ||
a8548816 | 91 | #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 | 92 | |
fd38203a | 93 | struct sd_event_source { |
9da4cb2b LP |
94 | WakeupType wakeup; |
95 | ||
da7e457c | 96 | unsigned n_ref; |
fd38203a LP |
97 | |
98 | sd_event *event; | |
99 | void *userdata; | |
718db961 | 100 | sd_event_handler_t prepare; |
fd38203a | 101 | |
356779df | 102 | char *description; |
f7f53e9e | 103 | |
6a0f1f6d | 104 | EventSourceType type:5; |
baf76283 | 105 | int enabled:3; |
fd38203a | 106 | bool pending:1; |
12179984 | 107 | bool dispatching:1; |
a71fe8b8 | 108 | bool floating:1; |
fd38203a | 109 | |
31927c16 | 110 | int64_t priority; |
fd38203a LP |
111 | unsigned pending_index; |
112 | unsigned prepare_index; | |
60a3b1e1 LP |
113 | uint64_t pending_iteration; |
114 | uint64_t prepare_iteration; | |
fd38203a | 115 | |
a71fe8b8 LP |
116 | LIST_FIELDS(sd_event_source, sources); |
117 | ||
fd38203a LP |
118 | union { |
119 | struct { | |
718db961 | 120 | sd_event_io_handler_t callback; |
fd38203a LP |
121 | int fd; |
122 | uint32_t events; | |
123 | uint32_t revents; | |
124 | bool registered:1; | |
ab93297c | 125 | bool owned:1; |
fd38203a LP |
126 | } io; |
127 | struct { | |
718db961 | 128 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
129 | usec_t next, accuracy; |
130 | unsigned earliest_index; | |
131 | unsigned latest_index; | |
fd38203a LP |
132 | } time; |
133 | struct { | |
718db961 | 134 | sd_event_signal_handler_t callback; |
fd38203a LP |
135 | struct signalfd_siginfo siginfo; |
136 | int sig; | |
137 | } signal; | |
138 | struct { | |
718db961 | 139 | sd_event_child_handler_t callback; |
fd38203a LP |
140 | siginfo_t siginfo; |
141 | pid_t pid; | |
142 | int options; | |
143 | } child; | |
144 | struct { | |
718db961 | 145 | sd_event_handler_t callback; |
fd38203a | 146 | } defer; |
6e9feda3 LP |
147 | struct { |
148 | sd_event_handler_t callback; | |
149 | } post; | |
da7e457c | 150 | struct { |
718db961 | 151 | sd_event_handler_t callback; |
da7e457c | 152 | unsigned prioq_index; |
6203e07a | 153 | } exit; |
fd38203a LP |
154 | }; |
155 | }; | |
156 | ||
6a0f1f6d | 157 | struct clock_data { |
9da4cb2b | 158 | WakeupType wakeup; |
6a0f1f6d LP |
159 | int fd; |
160 | ||
161 | /* For all clocks we maintain two priority queues each, one | |
162 | * ordered for the earliest times the events may be | |
163 | * dispatched, and one ordered by the latest times they must | |
164 | * have been dispatched. The range between the top entries in | |
165 | * the two prioqs is the time window we can freely schedule | |
166 | * wakeups in */ | |
167 | ||
168 | Prioq *earliest; | |
169 | Prioq *latest; | |
170 | usec_t next; | |
212bbb17 TG |
171 | |
172 | bool needs_rearm:1; | |
6a0f1f6d LP |
173 | }; |
174 | ||
9da4cb2b LP |
175 | struct signal_data { |
176 | WakeupType wakeup; | |
177 | ||
178 | /* For each priority we maintain one signal fd, so that we | |
179 | * only have to dequeue a single event per priority at a | |
180 | * time. */ | |
181 | ||
182 | int fd; | |
183 | int64_t priority; | |
184 | sigset_t sigset; | |
185 | sd_event_source *current; | |
186 | }; | |
187 | ||
fd38203a | 188 | struct sd_event { |
da7e457c | 189 | unsigned n_ref; |
fd38203a LP |
190 | |
191 | int epoll_fd; | |
cde93897 | 192 | int watchdog_fd; |
fd38203a LP |
193 | |
194 | Prioq *pending; | |
195 | Prioq *prepare; | |
c2ba3ad6 | 196 | |
a8548816 | 197 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
198 | * can add support for more clocks when the kernel learns to |
199 | * deal with them, too. */ | |
200 | struct clock_data realtime; | |
a8548816 | 201 | struct clock_data boottime; |
6a0f1f6d LP |
202 | struct clock_data monotonic; |
203 | struct clock_data realtime_alarm; | |
204 | struct clock_data boottime_alarm; | |
fd38203a | 205 | |
da7e457c LP |
206 | usec_t perturb; |
207 | ||
9da4cb2b LP |
208 | sd_event_source **signal_sources; /* indexed by signal number */ |
209 | Hashmap *signal_data; /* indexed by priority */ | |
fd38203a LP |
210 | |
211 | Hashmap *child_sources; | |
baf76283 | 212 | unsigned n_enabled_child_sources; |
fd38203a | 213 | |
6e9feda3 LP |
214 | Set *post_sources; |
215 | ||
6203e07a | 216 | Prioq *exit; |
fd38203a | 217 | |
da7e457c | 218 | pid_t original_pid; |
c2ba3ad6 | 219 | |
60a3b1e1 | 220 | uint64_t iteration; |
e475d10c | 221 | triple_timestamp timestamp; |
da7e457c | 222 | int state; |
eaa3cbef | 223 | |
6203e07a | 224 | bool exit_requested:1; |
da7e457c | 225 | bool need_process_child:1; |
cde93897 | 226 | bool watchdog:1; |
34b87517 | 227 | bool profile_delays:1; |
afc6adb5 | 228 | |
6203e07a LP |
229 | int exit_code; |
230 | ||
afc6adb5 LP |
231 | pid_t tid; |
232 | sd_event **default_event_ptr; | |
cde93897 LP |
233 | |
234 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
235 | |
236 | unsigned n_sources; | |
a71fe8b8 LP |
237 | |
238 | LIST_HEAD(sd_event_source, sources); | |
34b87517 VC |
239 | |
240 | usec_t last_run, last_log; | |
241 | unsigned delays[sizeof(usec_t) * 8]; | |
fd38203a LP |
242 | }; |
243 | ||
b937d761 NM |
244 | static thread_local sd_event *default_event = NULL; |
245 | ||
a71fe8b8 LP |
246 | static void source_disconnect(sd_event_source *s); |
247 | ||
b937d761 NM |
248 | static sd_event *event_resolve(sd_event *e) { |
249 | return e == SD_EVENT_DEFAULT ? default_event : e; | |
250 | } | |
251 | ||
fd38203a LP |
252 | static int pending_prioq_compare(const void *a, const void *b) { |
253 | const sd_event_source *x = a, *y = b; | |
254 | ||
255 | assert(x->pending); | |
256 | assert(y->pending); | |
257 | ||
baf76283 LP |
258 | /* Enabled ones first */ |
259 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 260 | return -1; |
baf76283 | 261 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
262 | return 1; |
263 | ||
264 | /* Lower priority values first */ | |
265 | if (x->priority < y->priority) | |
266 | return -1; | |
267 | if (x->priority > y->priority) | |
268 | return 1; | |
269 | ||
270 | /* Older entries first */ | |
271 | if (x->pending_iteration < y->pending_iteration) | |
272 | return -1; | |
273 | if (x->pending_iteration > y->pending_iteration) | |
274 | return 1; | |
275 | ||
fd38203a LP |
276 | return 0; |
277 | } | |
278 | ||
279 | static int prepare_prioq_compare(const void *a, const void *b) { | |
280 | const sd_event_source *x = a, *y = b; | |
281 | ||
282 | assert(x->prepare); | |
283 | assert(y->prepare); | |
284 | ||
8046c457 KK |
285 | /* Enabled ones first */ |
286 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
287 | return -1; | |
288 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
289 | return 1; | |
290 | ||
fd38203a LP |
291 | /* Move most recently prepared ones last, so that we can stop |
292 | * preparing as soon as we hit one that has already been | |
293 | * prepared in the current iteration */ | |
294 | if (x->prepare_iteration < y->prepare_iteration) | |
295 | return -1; | |
296 | if (x->prepare_iteration > y->prepare_iteration) | |
297 | return 1; | |
298 | ||
fd38203a LP |
299 | /* Lower priority values first */ |
300 | if (x->priority < y->priority) | |
301 | return -1; | |
302 | if (x->priority > y->priority) | |
303 | return 1; | |
304 | ||
fd38203a LP |
305 | return 0; |
306 | } | |
307 | ||
c2ba3ad6 | 308 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
309 | const sd_event_source *x = a, *y = b; |
310 | ||
6a0f1f6d LP |
311 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
312 | assert(x->type == y->type); | |
fd38203a | 313 | |
baf76283 LP |
314 | /* Enabled ones first */ |
315 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 316 | return -1; |
baf76283 | 317 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
318 | return 1; |
319 | ||
320 | /* Move the pending ones to the end */ | |
321 | if (!x->pending && y->pending) | |
322 | return -1; | |
323 | if (x->pending && !y->pending) | |
324 | return 1; | |
325 | ||
326 | /* Order by time */ | |
327 | if (x->time.next < y->time.next) | |
328 | return -1; | |
329 | if (x->time.next > y->time.next) | |
a99badf5 | 330 | return 1; |
fd38203a | 331 | |
fd38203a LP |
332 | return 0; |
333 | } | |
334 | ||
1bce0ffa LP |
335 | static usec_t time_event_source_latest(const sd_event_source *s) { |
336 | return usec_add(s->time.next, s->time.accuracy); | |
337 | } | |
338 | ||
c2ba3ad6 LP |
339 | static int latest_time_prioq_compare(const void *a, const void *b) { |
340 | const sd_event_source *x = a, *y = b; | |
341 | ||
6a0f1f6d LP |
342 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
343 | assert(x->type == y->type); | |
c2ba3ad6 | 344 | |
baf76283 LP |
345 | /* Enabled ones first */ |
346 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 347 | return -1; |
baf76283 | 348 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
349 | return 1; |
350 | ||
351 | /* Move the pending ones to the end */ | |
352 | if (!x->pending && y->pending) | |
353 | return -1; | |
354 | if (x->pending && !y->pending) | |
355 | return 1; | |
356 | ||
357 | /* Order by time */ | |
1bce0ffa | 358 | if (time_event_source_latest(x) < time_event_source_latest(y)) |
c2ba3ad6 | 359 | return -1; |
1bce0ffa | 360 | if (time_event_source_latest(x) > time_event_source_latest(y)) |
a99badf5 | 361 | return 1; |
c2ba3ad6 | 362 | |
c2ba3ad6 LP |
363 | return 0; |
364 | } | |
365 | ||
6203e07a | 366 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
367 | const sd_event_source *x = a, *y = b; |
368 | ||
6203e07a LP |
369 | assert(x->type == SOURCE_EXIT); |
370 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 371 | |
baf76283 LP |
372 | /* Enabled ones first */ |
373 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 374 | return -1; |
baf76283 | 375 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
376 | return 1; |
377 | ||
378 | /* Lower priority values first */ | |
379 | if (x->priority < y->priority) | |
380 | return -1; | |
381 | if (x->priority > y->priority) | |
382 | return 1; | |
383 | ||
da7e457c LP |
384 | return 0; |
385 | } | |
386 | ||
6a0f1f6d LP |
387 | static void free_clock_data(struct clock_data *d) { |
388 | assert(d); | |
9da4cb2b | 389 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
390 | |
391 | safe_close(d->fd); | |
392 | prioq_free(d->earliest); | |
393 | prioq_free(d->latest); | |
394 | } | |
395 | ||
fd38203a | 396 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
397 | sd_event_source *s; |
398 | ||
fd38203a | 399 | assert(e); |
a71fe8b8 LP |
400 | |
401 | while ((s = e->sources)) { | |
402 | assert(s->floating); | |
403 | source_disconnect(s); | |
404 | sd_event_source_unref(s); | |
405 | } | |
406 | ||
15b38f93 | 407 | assert(e->n_sources == 0); |
fd38203a | 408 | |
afc6adb5 LP |
409 | if (e->default_event_ptr) |
410 | *(e->default_event_ptr) = NULL; | |
411 | ||
03e334a1 | 412 | safe_close(e->epoll_fd); |
03e334a1 | 413 | safe_close(e->watchdog_fd); |
cde93897 | 414 | |
6a0f1f6d | 415 | free_clock_data(&e->realtime); |
a8548816 | 416 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
417 | free_clock_data(&e->monotonic); |
418 | free_clock_data(&e->realtime_alarm); | |
419 | free_clock_data(&e->boottime_alarm); | |
420 | ||
fd38203a LP |
421 | prioq_free(e->pending); |
422 | prioq_free(e->prepare); | |
6203e07a | 423 | prioq_free(e->exit); |
fd38203a LP |
424 | |
425 | free(e->signal_sources); | |
9da4cb2b | 426 | hashmap_free(e->signal_data); |
fd38203a LP |
427 | |
428 | hashmap_free(e->child_sources); | |
6e9feda3 | 429 | set_free(e->post_sources); |
fd38203a LP |
430 | free(e); |
431 | } | |
432 | ||
f7262a9f | 433 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
434 | sd_event *e; |
435 | int r; | |
436 | ||
305f78bf | 437 | assert_return(ret, -EINVAL); |
fd38203a LP |
438 | |
439 | e = new0(sd_event, 1); | |
440 | if (!e) | |
441 | return -ENOMEM; | |
442 | ||
da7e457c | 443 | e->n_ref = 1; |
9da4cb2b | 444 | 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 | 445 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
9da4cb2b | 446 | e->realtime.wakeup = e->boottime.wakeup = e->monotonic.wakeup = e->realtime_alarm.wakeup = e->boottime_alarm.wakeup = WAKEUP_CLOCK_DATA; |
df0ff127 | 447 | e->original_pid = getpid_cached(); |
3a43da28 | 448 | e->perturb = USEC_INFINITY; |
fd38203a | 449 | |
c983e776 EV |
450 | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
451 | if (r < 0) | |
fd38203a | 452 | goto fail; |
fd38203a LP |
453 | |
454 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
455 | if (e->epoll_fd < 0) { | |
456 | r = -errno; | |
457 | goto fail; | |
458 | } | |
459 | ||
34b87517 | 460 | if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) { |
34a6843d | 461 | 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 |
462 | e->profile_delays = true; |
463 | } | |
464 | ||
fd38203a LP |
465 | *ret = e; |
466 | return 0; | |
467 | ||
468 | fail: | |
469 | event_free(e); | |
470 | return r; | |
471 | } | |
472 | ||
f7262a9f | 473 | _public_ sd_event* sd_event_ref(sd_event *e) { |
6680dd6b LP |
474 | |
475 | if (!e) | |
476 | return NULL; | |
fd38203a | 477 | |
da7e457c LP |
478 | assert(e->n_ref >= 1); |
479 | e->n_ref++; | |
fd38203a LP |
480 | |
481 | return e; | |
482 | } | |
483 | ||
f7262a9f | 484 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
485 | |
486 | if (!e) | |
487 | return NULL; | |
fd38203a | 488 | |
da7e457c LP |
489 | assert(e->n_ref >= 1); |
490 | e->n_ref--; | |
491 | ||
492 | if (e->n_ref <= 0) | |
fd38203a LP |
493 | event_free(e); |
494 | ||
495 | return NULL; | |
496 | } | |
497 | ||
eaa3cbef LP |
498 | static bool event_pid_changed(sd_event *e) { |
499 | assert(e); | |
500 | ||
a2360a46 | 501 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
502 | * it around over a fork(). Let's complain. */ |
503 | ||
df0ff127 | 504 | return e->original_pid != getpid_cached(); |
eaa3cbef LP |
505 | } |
506 | ||
366e6411 | 507 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
508 | int r; |
509 | ||
510 | assert(s); | |
511 | assert(s->type == SOURCE_IO); | |
512 | ||
f6806734 | 513 | if (event_pid_changed(s->event)) |
366e6411 | 514 | return; |
f6806734 | 515 | |
fd38203a | 516 | if (!s->io.registered) |
366e6411 | 517 | return; |
fd38203a LP |
518 | |
519 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
556c25cf | 520 | if (r < 0) |
55cbfaa5 DM |
521 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m", |
522 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a LP |
523 | |
524 | s->io.registered = false; | |
fd38203a LP |
525 | } |
526 | ||
305f78bf LP |
527 | static int source_io_register( |
528 | sd_event_source *s, | |
529 | int enabled, | |
530 | uint32_t events) { | |
531 | ||
fd38203a LP |
532 | struct epoll_event ev = {}; |
533 | int r; | |
534 | ||
535 | assert(s); | |
536 | assert(s->type == SOURCE_IO); | |
baf76283 | 537 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
538 | |
539 | ev.events = events; | |
540 | ev.data.ptr = s; | |
541 | ||
baf76283 | 542 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
543 | ev.events |= EPOLLONESHOT; |
544 | ||
545 | if (s->io.registered) | |
546 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
547 | else | |
548 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
fd38203a LP |
549 | if (r < 0) |
550 | return -errno; | |
551 | ||
552 | s->io.registered = true; | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
6a0f1f6d LP |
557 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
558 | ||
559 | switch (t) { | |
560 | ||
561 | case SOURCE_TIME_REALTIME: | |
562 | return CLOCK_REALTIME; | |
563 | ||
a8548816 TG |
564 | case SOURCE_TIME_BOOTTIME: |
565 | return CLOCK_BOOTTIME; | |
566 | ||
6a0f1f6d LP |
567 | case SOURCE_TIME_MONOTONIC: |
568 | return CLOCK_MONOTONIC; | |
569 | ||
570 | case SOURCE_TIME_REALTIME_ALARM: | |
571 | return CLOCK_REALTIME_ALARM; | |
572 | ||
573 | case SOURCE_TIME_BOOTTIME_ALARM: | |
574 | return CLOCK_BOOTTIME_ALARM; | |
575 | ||
576 | default: | |
577 | return (clockid_t) -1; | |
578 | } | |
579 | } | |
580 | ||
581 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
582 | ||
583 | switch (clock) { | |
584 | ||
585 | case CLOCK_REALTIME: | |
586 | return SOURCE_TIME_REALTIME; | |
587 | ||
a8548816 TG |
588 | case CLOCK_BOOTTIME: |
589 | return SOURCE_TIME_BOOTTIME; | |
590 | ||
6a0f1f6d LP |
591 | case CLOCK_MONOTONIC: |
592 | return SOURCE_TIME_MONOTONIC; | |
593 | ||
594 | case CLOCK_REALTIME_ALARM: | |
595 | return SOURCE_TIME_REALTIME_ALARM; | |
596 | ||
597 | case CLOCK_BOOTTIME_ALARM: | |
598 | return SOURCE_TIME_BOOTTIME_ALARM; | |
599 | ||
600 | default: | |
601 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
602 | } | |
603 | } | |
604 | ||
605 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
606 | assert(e); | |
607 | ||
608 | switch (t) { | |
609 | ||
610 | case SOURCE_TIME_REALTIME: | |
611 | return &e->realtime; | |
612 | ||
a8548816 TG |
613 | case SOURCE_TIME_BOOTTIME: |
614 | return &e->boottime; | |
615 | ||
6a0f1f6d LP |
616 | case SOURCE_TIME_MONOTONIC: |
617 | return &e->monotonic; | |
618 | ||
619 | case SOURCE_TIME_REALTIME_ALARM: | |
620 | return &e->realtime_alarm; | |
621 | ||
622 | case SOURCE_TIME_BOOTTIME_ALARM: | |
623 | return &e->boottime_alarm; | |
624 | ||
625 | default: | |
626 | return NULL; | |
627 | } | |
628 | } | |
629 | ||
9da4cb2b LP |
630 | static int event_make_signal_data( |
631 | sd_event *e, | |
632 | int sig, | |
633 | struct signal_data **ret) { | |
4807d2d0 | 634 | |
f95387cd | 635 | struct epoll_event ev = {}; |
9da4cb2b LP |
636 | struct signal_data *d; |
637 | bool added = false; | |
638 | sigset_t ss_copy; | |
639 | int64_t priority; | |
f95387cd ZJS |
640 | int r; |
641 | ||
642 | assert(e); | |
643 | ||
f6806734 | 644 | if (event_pid_changed(e)) |
9da4cb2b | 645 | return -ECHILD; |
f6806734 | 646 | |
9da4cb2b LP |
647 | if (e->signal_sources && e->signal_sources[sig]) |
648 | priority = e->signal_sources[sig]->priority; | |
649 | else | |
650 | priority = 0; | |
f95387cd | 651 | |
9da4cb2b LP |
652 | d = hashmap_get(e->signal_data, &priority); |
653 | if (d) { | |
654 | if (sigismember(&d->sigset, sig) > 0) { | |
655 | if (ret) | |
656 | *ret = d; | |
657 | return 0; | |
658 | } | |
659 | } else { | |
660 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); | |
661 | if (r < 0) | |
662 | return r; | |
663 | ||
664 | d = new0(struct signal_data, 1); | |
665 | if (!d) | |
666 | return -ENOMEM; | |
667 | ||
668 | d->wakeup = WAKEUP_SIGNAL_DATA; | |
669 | d->fd = -1; | |
670 | d->priority = priority; | |
671 | ||
672 | r = hashmap_put(e->signal_data, &d->priority, d); | |
90f604d1 ZJS |
673 | if (r < 0) { |
674 | free(d); | |
9da4cb2b | 675 | return r; |
90f604d1 | 676 | } |
f95387cd | 677 | |
9da4cb2b LP |
678 | added = true; |
679 | } | |
680 | ||
681 | ss_copy = d->sigset; | |
682 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
683 | ||
684 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
685 | if (r < 0) { | |
686 | r = -errno; | |
687 | goto fail; | |
688 | } | |
689 | ||
690 | d->sigset = ss_copy; | |
f95387cd | 691 | |
9da4cb2b LP |
692 | if (d->fd >= 0) { |
693 | if (ret) | |
694 | *ret = d; | |
f95387cd | 695 | return 0; |
9da4cb2b LP |
696 | } |
697 | ||
698 | d->fd = r; | |
f95387cd ZJS |
699 | |
700 | ev.events = EPOLLIN; | |
9da4cb2b | 701 | ev.data.ptr = d; |
f95387cd | 702 | |
9da4cb2b LP |
703 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
704 | if (r < 0) { | |
705 | r = -errno; | |
706 | goto fail; | |
f95387cd ZJS |
707 | } |
708 | ||
9da4cb2b LP |
709 | if (ret) |
710 | *ret = d; | |
711 | ||
f95387cd | 712 | return 0; |
9da4cb2b LP |
713 | |
714 | fail: | |
715 | if (added) { | |
716 | d->fd = safe_close(d->fd); | |
717 | hashmap_remove(e->signal_data, &d->priority); | |
718 | free(d); | |
719 | } | |
720 | ||
721 | return r; | |
722 | } | |
723 | ||
724 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
725 | assert(e); | |
726 | assert(d); | |
727 | ||
728 | /* Turns off the specified signal in the signal data | |
729 | * object. If the signal mask of the object becomes empty that | |
730 | * way removes it. */ | |
731 | ||
732 | if (sigismember(&d->sigset, sig) == 0) | |
733 | return; | |
734 | ||
735 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
736 | ||
737 | if (sigisemptyset(&d->sigset)) { | |
738 | ||
739 | /* If all the mask is all-zero we can get rid of the structure */ | |
740 | hashmap_remove(e->signal_data, &d->priority); | |
9da4cb2b LP |
741 | safe_close(d->fd); |
742 | free(d); | |
743 | return; | |
744 | } | |
745 | ||
746 | assert(d->fd >= 0); | |
747 | ||
748 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
749 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
750 | } | |
751 | ||
752 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
753 | struct signal_data *d; | |
754 | static const int64_t zero_priority = 0; | |
755 | ||
756 | assert(e); | |
757 | ||
758 | /* Rechecks if the specified signal is still something we are | |
759 | * interested in. If not, we'll unmask it, and possibly drop | |
760 | * the signalfd for it. */ | |
761 | ||
762 | if (sig == SIGCHLD && | |
763 | e->n_enabled_child_sources > 0) | |
764 | return; | |
765 | ||
766 | if (e->signal_sources && | |
767 | e->signal_sources[sig] && | |
768 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
769 | return; | |
770 | ||
771 | /* | |
772 | * The specified signal might be enabled in three different queues: | |
773 | * | |
774 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
775 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
776 | * 3) the 0 priority (to cover the SIGCHLD case) | |
777 | * | |
778 | * Hence, let's remove it from all three here. | |
779 | */ | |
780 | ||
781 | if (priority) { | |
782 | d = hashmap_get(e->signal_data, priority); | |
783 | if (d) | |
784 | event_unmask_signal_data(e, d, sig); | |
785 | } | |
786 | ||
787 | if (e->signal_sources && e->signal_sources[sig]) { | |
788 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
789 | if (d) | |
790 | event_unmask_signal_data(e, d, sig); | |
791 | } | |
792 | ||
793 | d = hashmap_get(e->signal_data, &zero_priority); | |
794 | if (d) | |
795 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
796 | } |
797 | ||
a71fe8b8 LP |
798 | static void source_disconnect(sd_event_source *s) { |
799 | sd_event *event; | |
800 | ||
fd38203a LP |
801 | assert(s); |
802 | ||
a71fe8b8 LP |
803 | if (!s->event) |
804 | return; | |
15b38f93 | 805 | |
a71fe8b8 | 806 | assert(s->event->n_sources > 0); |
fd38203a | 807 | |
a71fe8b8 | 808 | switch (s->type) { |
fd38203a | 809 | |
a71fe8b8 LP |
810 | case SOURCE_IO: |
811 | if (s->io.fd >= 0) | |
812 | source_io_unregister(s); | |
fd38203a | 813 | |
a71fe8b8 | 814 | break; |
6a0f1f6d | 815 | |
a71fe8b8 | 816 | case SOURCE_TIME_REALTIME: |
a8548816 | 817 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
818 | case SOURCE_TIME_MONOTONIC: |
819 | case SOURCE_TIME_REALTIME_ALARM: | |
820 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
821 | struct clock_data *d; | |
fd38203a | 822 | |
a71fe8b8 LP |
823 | d = event_get_clock_data(s->event, s->type); |
824 | assert(d); | |
825 | ||
826 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
827 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 828 | d->needs_rearm = true; |
a71fe8b8 LP |
829 | break; |
830 | } | |
831 | ||
832 | case SOURCE_SIGNAL: | |
833 | if (s->signal.sig > 0) { | |
9da4cb2b | 834 | |
a71fe8b8 LP |
835 | if (s->event->signal_sources) |
836 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 837 | |
9da4cb2b | 838 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 839 | } |
fd38203a | 840 | |
a71fe8b8 | 841 | break; |
fd38203a | 842 | |
a71fe8b8 LP |
843 | case SOURCE_CHILD: |
844 | if (s->child.pid > 0) { | |
845 | if (s->enabled != SD_EVENT_OFF) { | |
846 | assert(s->event->n_enabled_child_sources > 0); | |
847 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 848 | } |
fd38203a | 849 | |
4a0b58c4 | 850 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
9da4cb2b | 851 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
a71fe8b8 | 852 | } |
fd38203a | 853 | |
a71fe8b8 | 854 | break; |
fd38203a | 855 | |
a71fe8b8 LP |
856 | case SOURCE_DEFER: |
857 | /* nothing */ | |
858 | break; | |
fd38203a | 859 | |
a71fe8b8 LP |
860 | case SOURCE_POST: |
861 | set_remove(s->event->post_sources, s); | |
862 | break; | |
da7e457c | 863 | |
a71fe8b8 LP |
864 | case SOURCE_EXIT: |
865 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
866 | break; | |
0eb2e0e3 | 867 | |
a71fe8b8 LP |
868 | default: |
869 | assert_not_reached("Wut? I shouldn't exist."); | |
870 | } | |
6e9feda3 | 871 | |
a71fe8b8 LP |
872 | if (s->pending) |
873 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 874 | |
a71fe8b8 LP |
875 | if (s->prepare) |
876 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 877 | |
a71fe8b8 | 878 | event = s->event; |
fd38203a | 879 | |
a71fe8b8 LP |
880 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
881 | s->event = NULL; | |
882 | LIST_REMOVE(sources, event->sources, s); | |
883 | event->n_sources--; | |
fd38203a | 884 | |
a71fe8b8 LP |
885 | if (!s->floating) |
886 | sd_event_unref(event); | |
887 | } | |
888 | ||
889 | static void source_free(sd_event_source *s) { | |
890 | assert(s); | |
fd38203a | 891 | |
a71fe8b8 | 892 | source_disconnect(s); |
ab93297c NM |
893 | |
894 | if (s->type == SOURCE_IO && s->io.owned) | |
895 | safe_close(s->io.fd); | |
896 | ||
356779df | 897 | free(s->description); |
fd38203a LP |
898 | free(s); |
899 | } | |
900 | ||
901 | static int source_set_pending(sd_event_source *s, bool b) { | |
902 | int r; | |
903 | ||
904 | assert(s); | |
6203e07a | 905 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
906 | |
907 | if (s->pending == b) | |
908 | return 0; | |
909 | ||
910 | s->pending = b; | |
911 | ||
912 | if (b) { | |
913 | s->pending_iteration = s->event->iteration; | |
914 | ||
915 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
916 | if (r < 0) { | |
917 | s->pending = false; | |
918 | return r; | |
919 | } | |
920 | } else | |
921 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
922 | ||
6a0f1f6d LP |
923 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
924 | struct clock_data *d; | |
925 | ||
926 | d = event_get_clock_data(s->event, s->type); | |
927 | assert(d); | |
928 | ||
929 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
930 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 931 | d->needs_rearm = true; |
2576a19e LP |
932 | } |
933 | ||
9da4cb2b LP |
934 | if (s->type == SOURCE_SIGNAL && !b) { |
935 | struct signal_data *d; | |
936 | ||
937 | d = hashmap_get(s->event->signal_data, &s->priority); | |
938 | if (d && d->current == s) | |
939 | d->current = NULL; | |
940 | } | |
941 | ||
fd38203a LP |
942 | return 0; |
943 | } | |
944 | ||
a71fe8b8 | 945 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
946 | sd_event_source *s; |
947 | ||
948 | assert(e); | |
949 | ||
950 | s = new0(sd_event_source, 1); | |
951 | if (!s) | |
952 | return NULL; | |
953 | ||
da7e457c | 954 | s->n_ref = 1; |
a71fe8b8 | 955 | s->event = e; |
4a134c49 | 956 | s->floating = floating; |
fd38203a | 957 | s->type = type; |
fd38203a | 958 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
959 | |
960 | if (!floating) | |
961 | sd_event_ref(e); | |
fd38203a | 962 | |
a71fe8b8 | 963 | LIST_PREPEND(sources, e->sources, s); |
313cefa1 | 964 | e->n_sources++; |
15b38f93 | 965 | |
fd38203a LP |
966 | return s; |
967 | } | |
968 | ||
f7262a9f | 969 | _public_ int sd_event_add_io( |
fd38203a | 970 | sd_event *e, |
151b9b96 | 971 | sd_event_source **ret, |
fd38203a LP |
972 | int fd, |
973 | uint32_t events, | |
718db961 | 974 | sd_event_io_handler_t callback, |
151b9b96 | 975 | void *userdata) { |
fd38203a LP |
976 | |
977 | sd_event_source *s; | |
978 | int r; | |
979 | ||
305f78bf | 980 | assert_return(e, -EINVAL); |
b937d761 | 981 | assert_return(e = event_resolve(e), -ENOPKG); |
8ac43fee | 982 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 983 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 984 | assert_return(callback, -EINVAL); |
da7e457c | 985 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 986 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 987 | |
a71fe8b8 | 988 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
989 | if (!s) |
990 | return -ENOMEM; | |
991 | ||
9da4cb2b | 992 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
993 | s->io.fd = fd; |
994 | s->io.events = events; | |
995 | s->io.callback = callback; | |
996 | s->userdata = userdata; | |
baf76283 | 997 | s->enabled = SD_EVENT_ON; |
fd38203a | 998 | |
baf76283 | 999 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1000 | if (r < 0) { |
1001 | source_free(s); | |
050f74f2 | 1002 | return r; |
fd38203a LP |
1003 | } |
1004 | ||
a71fe8b8 LP |
1005 | if (ret) |
1006 | *ret = s; | |
1007 | ||
fd38203a LP |
1008 | return 0; |
1009 | } | |
1010 | ||
52444dc4 LP |
1011 | static void initialize_perturb(sd_event *e) { |
1012 | sd_id128_t bootid = {}; | |
1013 | ||
1014 | /* When we sleep for longer, we try to realign the wakeup to | |
1015 | the same time wihtin each minute/second/250ms, so that | |
1016 | events all across the system can be coalesced into a single | |
1017 | CPU wakeup. However, let's take some system-specific | |
1018 | randomness for this value, so that in a network of systems | |
1019 | with synced clocks timer events are distributed a | |
1020 | bit. Here, we calculate a perturbation usec offset from the | |
1021 | boot ID. */ | |
1022 | ||
3a43da28 | 1023 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
1024 | return; |
1025 | ||
1026 | if (sd_id128_get_boot(&bootid) >= 0) | |
1027 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
1028 | } | |
1029 | ||
fd38203a LP |
1030 | static int event_setup_timer_fd( |
1031 | sd_event *e, | |
6a0f1f6d LP |
1032 | struct clock_data *d, |
1033 | clockid_t clock) { | |
fd38203a LP |
1034 | |
1035 | struct epoll_event ev = {}; | |
1036 | int r, fd; | |
1037 | ||
1038 | assert(e); | |
6a0f1f6d | 1039 | assert(d); |
fd38203a | 1040 | |
6a0f1f6d | 1041 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
1042 | return 0; |
1043 | ||
6a0f1f6d | 1044 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
1045 | if (fd < 0) |
1046 | return -errno; | |
1047 | ||
1048 | ev.events = EPOLLIN; | |
9da4cb2b | 1049 | ev.data.ptr = d; |
fd38203a LP |
1050 | |
1051 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
1052 | if (r < 0) { | |
03e334a1 | 1053 | safe_close(fd); |
fd38203a LP |
1054 | return -errno; |
1055 | } | |
1056 | ||
6a0f1f6d | 1057 | d->fd = fd; |
fd38203a LP |
1058 | return 0; |
1059 | } | |
1060 | ||
c4f1aff2 TG |
1061 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1062 | assert(s); | |
1063 | ||
1064 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1065 | } | |
1066 | ||
6a0f1f6d | 1067 | _public_ int sd_event_add_time( |
fd38203a | 1068 | sd_event *e, |
151b9b96 | 1069 | sd_event_source **ret, |
6a0f1f6d | 1070 | clockid_t clock, |
fd38203a | 1071 | uint64_t usec, |
c2ba3ad6 | 1072 | uint64_t accuracy, |
718db961 | 1073 | sd_event_time_handler_t callback, |
151b9b96 | 1074 | void *userdata) { |
fd38203a | 1075 | |
6a0f1f6d | 1076 | EventSourceType type; |
fd38203a | 1077 | sd_event_source *s; |
6a0f1f6d | 1078 | struct clock_data *d; |
fd38203a LP |
1079 | int r; |
1080 | ||
305f78bf | 1081 | assert_return(e, -EINVAL); |
b937d761 | 1082 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf | 1083 | assert_return(accuracy != (uint64_t) -1, -EINVAL); |
da7e457c | 1084 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1085 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1086 | |
e475d10c LP |
1087 | if (!clock_supported(clock)) /* Checks whether the kernel supports the clock */ |
1088 | return -EOPNOTSUPP; | |
1089 | ||
1090 | type = clock_to_event_source_type(clock); /* checks whether sd-event supports this clock */ | |
1091 | if (type < 0) | |
3411372e LP |
1092 | return -EOPNOTSUPP; |
1093 | ||
c4f1aff2 TG |
1094 | if (!callback) |
1095 | callback = time_exit_callback; | |
1096 | ||
6a0f1f6d LP |
1097 | d = event_get_clock_data(e, type); |
1098 | assert(d); | |
c2ba3ad6 | 1099 | |
c983e776 EV |
1100 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1101 | if (r < 0) | |
1102 | return r; | |
fd38203a | 1103 | |
c983e776 EV |
1104 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1105 | if (r < 0) | |
1106 | return r; | |
fd38203a | 1107 | |
6a0f1f6d LP |
1108 | if (d->fd < 0) { |
1109 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1110 | if (r < 0) |
1111 | return r; | |
1112 | } | |
1113 | ||
a71fe8b8 | 1114 | s = source_new(e, !ret, type); |
fd38203a LP |
1115 | if (!s) |
1116 | return -ENOMEM; | |
1117 | ||
1118 | s->time.next = usec; | |
c2ba3ad6 | 1119 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1120 | s->time.callback = callback; |
da7e457c | 1121 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1122 | s->userdata = userdata; |
baf76283 | 1123 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1124 | |
e07bbb7c TG |
1125 | d->needs_rearm = true; |
1126 | ||
6a0f1f6d | 1127 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
1128 | if (r < 0) |
1129 | goto fail; | |
1130 | ||
6a0f1f6d | 1131 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
1132 | if (r < 0) |
1133 | goto fail; | |
fd38203a | 1134 | |
a71fe8b8 LP |
1135 | if (ret) |
1136 | *ret = s; | |
1137 | ||
fd38203a | 1138 | return 0; |
c2ba3ad6 LP |
1139 | |
1140 | fail: | |
1141 | source_free(s); | |
1142 | return r; | |
fd38203a LP |
1143 | } |
1144 | ||
59bc1fd7 LP |
1145 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1146 | assert(s); | |
1147 | ||
1148 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1149 | } | |
1150 | ||
f7262a9f | 1151 | _public_ int sd_event_add_signal( |
305f78bf | 1152 | sd_event *e, |
151b9b96 | 1153 | sd_event_source **ret, |
305f78bf | 1154 | int sig, |
718db961 | 1155 | sd_event_signal_handler_t callback, |
151b9b96 | 1156 | void *userdata) { |
305f78bf | 1157 | |
fd38203a | 1158 | sd_event_source *s; |
9da4cb2b | 1159 | struct signal_data *d; |
3022d74b | 1160 | sigset_t ss; |
fd38203a LP |
1161 | int r; |
1162 | ||
305f78bf | 1163 | assert_return(e, -EINVAL); |
b937d761 | 1164 | assert_return(e = event_resolve(e), -ENOPKG); |
6eb7c172 | 1165 | assert_return(SIGNAL_VALID(sig), -EINVAL); |
da7e457c | 1166 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1167 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1168 | |
59bc1fd7 LP |
1169 | if (!callback) |
1170 | callback = signal_exit_callback; | |
1171 | ||
3022d74b | 1172 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
50e0d56c LP |
1173 | if (r != 0) |
1174 | return -r; | |
3022d74b LP |
1175 | |
1176 | if (!sigismember(&ss, sig)) | |
1177 | return -EBUSY; | |
1178 | ||
fd38203a LP |
1179 | if (!e->signal_sources) { |
1180 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1181 | if (!e->signal_sources) | |
1182 | return -ENOMEM; | |
1183 | } else if (e->signal_sources[sig]) | |
1184 | return -EBUSY; | |
1185 | ||
a71fe8b8 | 1186 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1187 | if (!s) |
1188 | return -ENOMEM; | |
1189 | ||
1190 | s->signal.sig = sig; | |
1191 | s->signal.callback = callback; | |
1192 | s->userdata = userdata; | |
baf76283 | 1193 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1194 | |
1195 | e->signal_sources[sig] = s; | |
fd38203a | 1196 | |
9da4cb2b LP |
1197 | r = event_make_signal_data(e, sig, &d); |
1198 | if (r < 0) { | |
1199 | source_free(s); | |
1200 | return r; | |
fd38203a LP |
1201 | } |
1202 | ||
f1f00dbb LP |
1203 | /* Use the signal name as description for the event source by default */ |
1204 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1205 | ||
a71fe8b8 LP |
1206 | if (ret) |
1207 | *ret = s; | |
1208 | ||
fd38203a LP |
1209 | return 0; |
1210 | } | |
1211 | ||
f7262a9f | 1212 | _public_ int sd_event_add_child( |
305f78bf | 1213 | sd_event *e, |
151b9b96 | 1214 | sd_event_source **ret, |
305f78bf LP |
1215 | pid_t pid, |
1216 | int options, | |
718db961 | 1217 | sd_event_child_handler_t callback, |
151b9b96 | 1218 | void *userdata) { |
305f78bf | 1219 | |
fd38203a LP |
1220 | sd_event_source *s; |
1221 | int r; | |
1222 | ||
305f78bf | 1223 | assert_return(e, -EINVAL); |
b937d761 | 1224 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf LP |
1225 | assert_return(pid > 1, -EINVAL); |
1226 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1227 | assert_return(options != 0, -EINVAL); | |
1228 | assert_return(callback, -EINVAL); | |
da7e457c | 1229 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1230 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1231 | |
d5099efc | 1232 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1233 | if (r < 0) |
1234 | return r; | |
1235 | ||
4a0b58c4 | 1236 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1237 | return -EBUSY; |
1238 | ||
a71fe8b8 | 1239 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1240 | if (!s) |
1241 | return -ENOMEM; | |
1242 | ||
1243 | s->child.pid = pid; | |
1244 | s->child.options = options; | |
1245 | s->child.callback = callback; | |
1246 | s->userdata = userdata; | |
baf76283 | 1247 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1248 | |
4a0b58c4 | 1249 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
fd38203a LP |
1250 | if (r < 0) { |
1251 | source_free(s); | |
1252 | return r; | |
1253 | } | |
1254 | ||
313cefa1 | 1255 | e->n_enabled_child_sources++; |
fd38203a | 1256 | |
9da4cb2b LP |
1257 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1258 | if (r < 0) { | |
1259 | e->n_enabled_child_sources--; | |
1260 | source_free(s); | |
1261 | return r; | |
fd38203a LP |
1262 | } |
1263 | ||
c2ba3ad6 LP |
1264 | e->need_process_child = true; |
1265 | ||
a71fe8b8 LP |
1266 | if (ret) |
1267 | *ret = s; | |
1268 | ||
fd38203a LP |
1269 | return 0; |
1270 | } | |
1271 | ||
f7262a9f | 1272 | _public_ int sd_event_add_defer( |
305f78bf | 1273 | sd_event *e, |
151b9b96 | 1274 | sd_event_source **ret, |
718db961 | 1275 | sd_event_handler_t callback, |
151b9b96 | 1276 | void *userdata) { |
305f78bf | 1277 | |
fd38203a LP |
1278 | sd_event_source *s; |
1279 | int r; | |
1280 | ||
305f78bf | 1281 | assert_return(e, -EINVAL); |
b937d761 | 1282 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf | 1283 | assert_return(callback, -EINVAL); |
da7e457c | 1284 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1285 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1286 | |
a71fe8b8 | 1287 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1288 | if (!s) |
1289 | return -ENOMEM; | |
1290 | ||
1291 | s->defer.callback = callback; | |
1292 | s->userdata = userdata; | |
baf76283 | 1293 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1294 | |
1295 | r = source_set_pending(s, true); | |
1296 | if (r < 0) { | |
1297 | source_free(s); | |
1298 | return r; | |
1299 | } | |
1300 | ||
a71fe8b8 LP |
1301 | if (ret) |
1302 | *ret = s; | |
1303 | ||
fd38203a LP |
1304 | return 0; |
1305 | } | |
1306 | ||
6e9feda3 LP |
1307 | _public_ int sd_event_add_post( |
1308 | sd_event *e, | |
1309 | sd_event_source **ret, | |
1310 | sd_event_handler_t callback, | |
1311 | void *userdata) { | |
1312 | ||
1313 | sd_event_source *s; | |
1314 | int r; | |
1315 | ||
1316 | assert_return(e, -EINVAL); | |
b937d761 | 1317 | assert_return(e = event_resolve(e), -ENOPKG); |
6e9feda3 | 1318 | assert_return(callback, -EINVAL); |
6e9feda3 LP |
1319 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1320 | assert_return(!event_pid_changed(e), -ECHILD); | |
1321 | ||
d5099efc | 1322 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1323 | if (r < 0) |
1324 | return r; | |
1325 | ||
a71fe8b8 | 1326 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1327 | if (!s) |
1328 | return -ENOMEM; | |
1329 | ||
1330 | s->post.callback = callback; | |
1331 | s->userdata = userdata; | |
1332 | s->enabled = SD_EVENT_ON; | |
1333 | ||
1334 | r = set_put(e->post_sources, s); | |
1335 | if (r < 0) { | |
1336 | source_free(s); | |
1337 | return r; | |
1338 | } | |
1339 | ||
a71fe8b8 LP |
1340 | if (ret) |
1341 | *ret = s; | |
1342 | ||
6e9feda3 LP |
1343 | return 0; |
1344 | } | |
1345 | ||
6203e07a | 1346 | _public_ int sd_event_add_exit( |
305f78bf | 1347 | sd_event *e, |
151b9b96 | 1348 | sd_event_source **ret, |
718db961 | 1349 | sd_event_handler_t callback, |
151b9b96 | 1350 | void *userdata) { |
305f78bf | 1351 | |
da7e457c LP |
1352 | sd_event_source *s; |
1353 | int r; | |
1354 | ||
1355 | assert_return(e, -EINVAL); | |
b937d761 | 1356 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
1357 | assert_return(callback, -EINVAL); |
1358 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1359 | assert_return(!event_pid_changed(e), -ECHILD); | |
1360 | ||
c983e776 EV |
1361 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1362 | if (r < 0) | |
1363 | return r; | |
da7e457c | 1364 | |
a71fe8b8 | 1365 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1366 | if (!s) |
da7e457c | 1367 | return -ENOMEM; |
fd38203a | 1368 | |
6203e07a | 1369 | s->exit.callback = callback; |
da7e457c | 1370 | s->userdata = userdata; |
6203e07a | 1371 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1372 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1373 | |
6203e07a | 1374 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1375 | if (r < 0) { |
1376 | source_free(s); | |
1377 | return r; | |
1378 | } | |
1379 | ||
a71fe8b8 LP |
1380 | if (ret) |
1381 | *ret = s; | |
1382 | ||
da7e457c LP |
1383 | return 0; |
1384 | } | |
1385 | ||
f7262a9f | 1386 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
6680dd6b LP |
1387 | |
1388 | if (!s) | |
1389 | return NULL; | |
da7e457c LP |
1390 | |
1391 | assert(s->n_ref >= 1); | |
1392 | s->n_ref++; | |
fd38203a LP |
1393 | |
1394 | return s; | |
1395 | } | |
1396 | ||
f7262a9f | 1397 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1398 | |
1399 | if (!s) | |
1400 | return NULL; | |
fd38203a | 1401 | |
da7e457c LP |
1402 | assert(s->n_ref >= 1); |
1403 | s->n_ref--; | |
1404 | ||
12179984 LP |
1405 | if (s->n_ref <= 0) { |
1406 | /* Here's a special hack: when we are called from a | |
1407 | * dispatch handler we won't free the event source | |
1408 | * immediately, but we will detach the fd from the | |
1409 | * epoll. This way it is safe for the caller to unref | |
1410 | * the event source and immediately close the fd, but | |
1411 | * we still retain a valid event source object after | |
1412 | * the callback. */ | |
1413 | ||
1414 | if (s->dispatching) { | |
1415 | if (s->type == SOURCE_IO) | |
1416 | source_io_unregister(s); | |
a71fe8b8 LP |
1417 | |
1418 | source_disconnect(s); | |
12179984 LP |
1419 | } else |
1420 | source_free(s); | |
1421 | } | |
fd38203a LP |
1422 | |
1423 | return NULL; | |
1424 | } | |
1425 | ||
356779df | 1426 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1427 | assert_return(s, -EINVAL); |
f4b2933e | 1428 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1429 | |
356779df | 1430 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1431 | } |
1432 | ||
356779df | 1433 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1434 | assert_return(s, -EINVAL); |
356779df | 1435 | assert_return(description, -EINVAL); |
f4b2933e LP |
1436 | assert_return(s->description, -ENXIO); |
1437 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
f7f53e9e | 1438 | |
356779df | 1439 | *description = s->description; |
f7f53e9e TG |
1440 | return 0; |
1441 | } | |
1442 | ||
adcc4ca3 | 1443 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1444 | assert_return(s, NULL); |
eaa3cbef LP |
1445 | |
1446 | return s->event; | |
1447 | } | |
1448 | ||
f7262a9f | 1449 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1450 | assert_return(s, -EINVAL); |
6203e07a | 1451 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1452 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1453 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1454 | |
1455 | return s->pending; | |
1456 | } | |
1457 | ||
f7262a9f | 1458 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1459 | assert_return(s, -EINVAL); |
1460 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1461 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1462 | |
1463 | return s->io.fd; | |
1464 | } | |
1465 | ||
30caf8f3 LP |
1466 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1467 | int r; | |
1468 | ||
1469 | assert_return(s, -EINVAL); | |
8ac43fee | 1470 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1471 | assert_return(s->type == SOURCE_IO, -EDOM); |
1472 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1473 | ||
1474 | if (s->io.fd == fd) | |
1475 | return 0; | |
1476 | ||
1477 | if (s->enabled == SD_EVENT_OFF) { | |
1478 | s->io.fd = fd; | |
1479 | s->io.registered = false; | |
1480 | } else { | |
1481 | int saved_fd; | |
1482 | ||
1483 | saved_fd = s->io.fd; | |
1484 | assert(s->io.registered); | |
1485 | ||
1486 | s->io.fd = fd; | |
1487 | s->io.registered = false; | |
1488 | ||
1489 | r = source_io_register(s, s->enabled, s->io.events); | |
1490 | if (r < 0) { | |
1491 | s->io.fd = saved_fd; | |
1492 | s->io.registered = true; | |
1493 | return r; | |
1494 | } | |
1495 | ||
1496 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1497 | } | |
1498 | ||
1499 | return 0; | |
1500 | } | |
1501 | ||
ab93297c NM |
1502 | _public_ int sd_event_source_get_io_fd_own(sd_event_source *s) { |
1503 | assert_return(s, -EINVAL); | |
1504 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1505 | ||
1506 | return s->io.owned; | |
1507 | } | |
1508 | ||
1509 | _public_ int sd_event_source_set_io_fd_own(sd_event_source *s, int own) { | |
1510 | assert_return(s, -EINVAL); | |
1511 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1512 | ||
1513 | s->io.owned = own; | |
1514 | return 0; | |
1515 | } | |
1516 | ||
f7262a9f | 1517 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1518 | assert_return(s, -EINVAL); |
1519 | assert_return(events, -EINVAL); | |
1520 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1521 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1522 | |
1523 | *events = s->io.events; | |
1524 | return 0; | |
1525 | } | |
1526 | ||
f7262a9f | 1527 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1528 | int r; |
1529 | ||
305f78bf LP |
1530 | assert_return(s, -EINVAL); |
1531 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1532 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1533 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1534 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1535 | |
b63c8d4f DH |
1536 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1537 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1538 | return 0; |
1539 | ||
baf76283 | 1540 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1541 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1542 | if (r < 0) |
1543 | return r; | |
1544 | } | |
1545 | ||
1546 | s->io.events = events; | |
503f39c3 | 1547 | source_set_pending(s, false); |
fd38203a LP |
1548 | |
1549 | return 0; | |
1550 | } | |
1551 | ||
f7262a9f | 1552 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1553 | assert_return(s, -EINVAL); |
1554 | assert_return(revents, -EINVAL); | |
1555 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1556 | assert_return(s->pending, -ENODATA); | |
1557 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1558 | |
1559 | *revents = s->io.revents; | |
1560 | return 0; | |
1561 | } | |
1562 | ||
f7262a9f | 1563 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1564 | assert_return(s, -EINVAL); |
1565 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1566 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1567 | |
1568 | return s->signal.sig; | |
1569 | } | |
1570 | ||
31927c16 | 1571 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1572 | assert_return(s, -EINVAL); |
1573 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1574 | |
6680b8d1 ME |
1575 | *priority = s->priority; |
1576 | return 0; | |
fd38203a LP |
1577 | } |
1578 | ||
31927c16 | 1579 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
9da4cb2b LP |
1580 | int r; |
1581 | ||
305f78bf | 1582 | assert_return(s, -EINVAL); |
da7e457c | 1583 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1584 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1585 | |
1586 | if (s->priority == priority) | |
1587 | return 0; | |
1588 | ||
9da4cb2b LP |
1589 | if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { |
1590 | struct signal_data *old, *d; | |
1591 | ||
1592 | /* Move us from the signalfd belonging to the old | |
1593 | * priority to the signalfd of the new priority */ | |
1594 | ||
1595 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
1596 | ||
1597 | s->priority = priority; | |
1598 | ||
1599 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
1600 | if (r < 0) { | |
1601 | s->priority = old->priority; | |
1602 | return r; | |
1603 | } | |
1604 | ||
1605 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
1606 | } else | |
1607 | s->priority = priority; | |
fd38203a LP |
1608 | |
1609 | if (s->pending) | |
c2ba3ad6 | 1610 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1611 | |
1612 | if (s->prepare) | |
c2ba3ad6 | 1613 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1614 | |
6203e07a LP |
1615 | if (s->type == SOURCE_EXIT) |
1616 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1617 | |
fd38203a LP |
1618 | return 0; |
1619 | } | |
1620 | ||
f7262a9f | 1621 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1622 | assert_return(s, -EINVAL); |
1623 | assert_return(m, -EINVAL); | |
1624 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1625 | |
baf76283 | 1626 | *m = s->enabled; |
fd38203a LP |
1627 | return 0; |
1628 | } | |
1629 | ||
f7262a9f | 1630 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1631 | int r; |
1632 | ||
305f78bf | 1633 | assert_return(s, -EINVAL); |
945c2931 | 1634 | assert_return(IN_SET(m, SD_EVENT_OFF, SD_EVENT_ON, SD_EVENT_ONESHOT), -EINVAL); |
305f78bf | 1635 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1636 | |
cc567911 LP |
1637 | /* If we are dead anyway, we are fine with turning off |
1638 | * sources, but everything else needs to fail. */ | |
1639 | if (s->event->state == SD_EVENT_FINISHED) | |
1640 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1641 | ||
baf76283 | 1642 | if (s->enabled == m) |
fd38203a LP |
1643 | return 0; |
1644 | ||
baf76283 | 1645 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1646 | |
1647 | switch (s->type) { | |
1648 | ||
1649 | case SOURCE_IO: | |
366e6411 | 1650 | source_io_unregister(s); |
baf76283 | 1651 | s->enabled = m; |
fd38203a LP |
1652 | break; |
1653 | ||
6a0f1f6d | 1654 | case SOURCE_TIME_REALTIME: |
a8548816 | 1655 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1656 | case SOURCE_TIME_MONOTONIC: |
1657 | case SOURCE_TIME_REALTIME_ALARM: | |
1658 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1659 | struct clock_data *d; | |
fd38203a | 1660 | |
baf76283 | 1661 | s->enabled = m; |
6a0f1f6d LP |
1662 | d = event_get_clock_data(s->event, s->type); |
1663 | assert(d); | |
1664 | ||
1665 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1666 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1667 | d->needs_rearm = true; |
fd38203a | 1668 | break; |
6a0f1f6d | 1669 | } |
fd38203a LP |
1670 | |
1671 | case SOURCE_SIGNAL: | |
baf76283 | 1672 | s->enabled = m; |
4807d2d0 | 1673 | |
9da4cb2b | 1674 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
fd38203a LP |
1675 | break; |
1676 | ||
1677 | case SOURCE_CHILD: | |
baf76283 | 1678 | s->enabled = m; |
fd38203a | 1679 | |
baf76283 LP |
1680 | assert(s->event->n_enabled_child_sources > 0); |
1681 | s->event->n_enabled_child_sources--; | |
fd38203a | 1682 | |
9da4cb2b | 1683 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
fd38203a LP |
1684 | break; |
1685 | ||
6203e07a | 1686 | case SOURCE_EXIT: |
305f78bf | 1687 | s->enabled = m; |
6203e07a | 1688 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1689 | break; |
1690 | ||
1691 | case SOURCE_DEFER: | |
6e9feda3 | 1692 | case SOURCE_POST: |
baf76283 | 1693 | s->enabled = m; |
fd38203a | 1694 | break; |
9d3e3aa5 | 1695 | |
6a0f1f6d | 1696 | default: |
9d3e3aa5 | 1697 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1698 | } |
1699 | ||
1700 | } else { | |
1701 | switch (s->type) { | |
1702 | ||
1703 | case SOURCE_IO: | |
1704 | r = source_io_register(s, m, s->io.events); | |
1705 | if (r < 0) | |
1706 | return r; | |
1707 | ||
baf76283 | 1708 | s->enabled = m; |
fd38203a LP |
1709 | break; |
1710 | ||
6a0f1f6d | 1711 | case SOURCE_TIME_REALTIME: |
a8548816 | 1712 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1713 | case SOURCE_TIME_MONOTONIC: |
1714 | case SOURCE_TIME_REALTIME_ALARM: | |
1715 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1716 | struct clock_data *d; | |
fd38203a | 1717 | |
baf76283 | 1718 | s->enabled = m; |
6a0f1f6d LP |
1719 | d = event_get_clock_data(s->event, s->type); |
1720 | assert(d); | |
1721 | ||
1722 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1723 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1724 | d->needs_rearm = true; |
fd38203a | 1725 | break; |
6a0f1f6d | 1726 | } |
fd38203a LP |
1727 | |
1728 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1729 | |
1730 | s->enabled = m; | |
9da4cb2b LP |
1731 | |
1732 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
1733 | if (r < 0) { | |
1734 | s->enabled = SD_EVENT_OFF; | |
1735 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
1736 | return r; | |
1737 | } | |
1738 | ||
fd38203a LP |
1739 | break; |
1740 | ||
1741 | case SOURCE_CHILD: | |
4807d2d0 | 1742 | |
9da4cb2b | 1743 | if (s->enabled == SD_EVENT_OFF) |
4807d2d0 | 1744 | s->event->n_enabled_child_sources++; |
7a0d4a3d DH |
1745 | |
1746 | s->enabled = m; | |
9da4cb2b | 1747 | |
10edebf6 | 1748 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
9da4cb2b LP |
1749 | if (r < 0) { |
1750 | s->enabled = SD_EVENT_OFF; | |
1751 | s->event->n_enabled_child_sources--; | |
1752 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
1753 | return r; | |
1754 | } | |
1755 | ||
fd38203a LP |
1756 | break; |
1757 | ||
6203e07a | 1758 | case SOURCE_EXIT: |
305f78bf | 1759 | s->enabled = m; |
6203e07a | 1760 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1761 | break; |
1762 | ||
1763 | case SOURCE_DEFER: | |
6e9feda3 | 1764 | case SOURCE_POST: |
baf76283 | 1765 | s->enabled = m; |
fd38203a | 1766 | break; |
9d3e3aa5 | 1767 | |
6a0f1f6d | 1768 | default: |
9d3e3aa5 | 1769 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1770 | } |
1771 | } | |
1772 | ||
1773 | if (s->pending) | |
1774 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1775 | ||
1776 | if (s->prepare) | |
1777 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1778 | ||
1779 | return 0; | |
1780 | } | |
1781 | ||
f7262a9f | 1782 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1783 | assert_return(s, -EINVAL); |
1784 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1785 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1786 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1787 | |
1788 | *usec = s->time.next; | |
1789 | return 0; | |
1790 | } | |
1791 | ||
f7262a9f | 1792 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1793 | struct clock_data *d; |
1794 | ||
305f78bf | 1795 | assert_return(s, -EINVAL); |
6a0f1f6d | 1796 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1797 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1798 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1799 | |
fd38203a | 1800 | s->time.next = usec; |
2576a19e | 1801 | |
0cc1125a | 1802 | source_set_pending(s, false); |
fd38203a | 1803 | |
6a0f1f6d LP |
1804 | d = event_get_clock_data(s->event, s->type); |
1805 | assert(d); | |
1806 | ||
1807 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1808 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1809 | d->needs_rearm = true; |
fd38203a LP |
1810 | |
1811 | return 0; | |
1812 | } | |
1813 | ||
f7262a9f | 1814 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1815 | assert_return(s, -EINVAL); |
1816 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1817 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1818 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1819 | ||
1820 | *usec = s->time.accuracy; | |
1821 | return 0; | |
1822 | } | |
1823 | ||
f7262a9f | 1824 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1825 | struct clock_data *d; |
1826 | ||
305f78bf LP |
1827 | assert_return(s, -EINVAL); |
1828 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1829 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1830 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1831 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1832 | |
1833 | if (usec == 0) | |
1834 | usec = DEFAULT_ACCURACY_USEC; | |
1835 | ||
eaa3cbef LP |
1836 | s->time.accuracy = usec; |
1837 | ||
2576a19e LP |
1838 | source_set_pending(s, false); |
1839 | ||
6a0f1f6d LP |
1840 | d = event_get_clock_data(s->event, s->type); |
1841 | assert(d); | |
1842 | ||
1843 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1844 | d->needs_rearm = true; |
6a0f1f6d LP |
1845 | |
1846 | return 0; | |
1847 | } | |
1848 | ||
1849 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1850 | assert_return(s, -EINVAL); | |
1851 | assert_return(clock, -EINVAL); | |
1852 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1853 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1854 | |
6a0f1f6d | 1855 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1856 | return 0; |
1857 | } | |
1858 | ||
f7262a9f | 1859 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1860 | assert_return(s, -EINVAL); |
1861 | assert_return(pid, -EINVAL); | |
1862 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1863 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1864 | ||
1865 | *pid = s->child.pid; | |
1866 | return 0; | |
1867 | } | |
1868 | ||
718db961 | 1869 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1870 | int r; |
1871 | ||
da7e457c | 1872 | assert_return(s, -EINVAL); |
6203e07a | 1873 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1874 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1875 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1876 | |
1877 | if (s->prepare == callback) | |
1878 | return 0; | |
1879 | ||
1880 | if (callback && s->prepare) { | |
1881 | s->prepare = callback; | |
1882 | return 0; | |
1883 | } | |
1884 | ||
1885 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1886 | if (r < 0) | |
1887 | return r; | |
1888 | ||
1889 | s->prepare = callback; | |
1890 | ||
1891 | if (callback) { | |
1892 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1893 | if (r < 0) | |
1894 | return r; | |
1895 | } else | |
1896 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1897 | ||
1898 | return 0; | |
1899 | } | |
1900 | ||
f7262a9f | 1901 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1902 | assert_return(s, NULL); |
fd38203a LP |
1903 | |
1904 | return s->userdata; | |
1905 | } | |
1906 | ||
8f726607 LP |
1907 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1908 | void *ret; | |
1909 | ||
1910 | assert_return(s, NULL); | |
1911 | ||
1912 | ret = s->userdata; | |
1913 | s->userdata = userdata; | |
1914 | ||
1915 | return ret; | |
1916 | } | |
1917 | ||
c2ba3ad6 LP |
1918 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1919 | usec_t c; | |
1920 | assert(e); | |
1921 | assert(a <= b); | |
1922 | ||
1923 | if (a <= 0) | |
1924 | return 0; | |
393003e1 LP |
1925 | if (a >= USEC_INFINITY) |
1926 | return USEC_INFINITY; | |
c2ba3ad6 LP |
1927 | |
1928 | if (b <= a + 1) | |
1929 | return a; | |
1930 | ||
52444dc4 LP |
1931 | initialize_perturb(e); |
1932 | ||
c2ba3ad6 LP |
1933 | /* |
1934 | Find a good time to wake up again between times a and b. We | |
1935 | have two goals here: | |
1936 | ||
1937 | a) We want to wake up as seldom as possible, hence prefer | |
1938 | later times over earlier times. | |
1939 | ||
1940 | b) But if we have to wake up, then let's make sure to | |
1941 | dispatch as much as possible on the entire system. | |
1942 | ||
1943 | We implement this by waking up everywhere at the same time | |
850516e0 | 1944 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1945 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1946 | then we try to find the same spot in every 10s, then 1s and |
1947 | then 250ms step. Otherwise, we pick the last possible time | |
1948 | to wake up. | |
c2ba3ad6 LP |
1949 | */ |
1950 | ||
850516e0 LP |
1951 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1952 | if (c >= b) { | |
1953 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1954 | return b; | |
1955 | ||
1956 | c -= USEC_PER_MINUTE; | |
1957 | } | |
1958 | ||
ba276c81 LP |
1959 | if (c >= a) |
1960 | return c; | |
1961 | ||
1962 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1963 | if (c >= b) { | |
1964 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1965 | return b; | |
1966 | ||
1967 | c -= USEC_PER_SEC*10; | |
1968 | } | |
1969 | ||
850516e0 LP |
1970 | if (c >= a) |
1971 | return c; | |
1972 | ||
1973 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1974 | if (c >= b) { |
1975 | if (_unlikely_(c < USEC_PER_SEC)) | |
1976 | return b; | |
1977 | ||
1978 | c -= USEC_PER_SEC; | |
1979 | } | |
1980 | ||
1981 | if (c >= a) | |
1982 | return c; | |
1983 | ||
1984 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1985 | if (c >= b) { | |
1986 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1987 | return b; | |
1988 | ||
1989 | c -= USEC_PER_MSEC*250; | |
1990 | } | |
1991 | ||
1992 | if (c >= a) | |
1993 | return c; | |
1994 | ||
1995 | return b; | |
1996 | } | |
1997 | ||
fd38203a LP |
1998 | static int event_arm_timer( |
1999 | sd_event *e, | |
6a0f1f6d | 2000 | struct clock_data *d) { |
fd38203a LP |
2001 | |
2002 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
2003 | sd_event_source *a, *b; |
2004 | usec_t t; | |
fd38203a LP |
2005 | int r; |
2006 | ||
cde93897 | 2007 | assert(e); |
6a0f1f6d | 2008 | assert(d); |
fd38203a | 2009 | |
d06441da | 2010 | if (!d->needs_rearm) |
212bbb17 TG |
2011 | return 0; |
2012 | else | |
2013 | d->needs_rearm = false; | |
2014 | ||
6a0f1f6d | 2015 | a = prioq_peek(d->earliest); |
393003e1 | 2016 | if (!a || a->enabled == SD_EVENT_OFF || a->time.next == USEC_INFINITY) { |
72aedc1e | 2017 | |
6a0f1f6d | 2018 | if (d->fd < 0) |
c57b5ca3 LP |
2019 | return 0; |
2020 | ||
3a43da28 | 2021 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
2022 | return 0; |
2023 | ||
2024 | /* disarm */ | |
6a0f1f6d | 2025 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
2026 | if (r < 0) |
2027 | return r; | |
2028 | ||
3a43da28 | 2029 | d->next = USEC_INFINITY; |
fd38203a | 2030 | return 0; |
72aedc1e | 2031 | } |
fd38203a | 2032 | |
6a0f1f6d | 2033 | b = prioq_peek(d->latest); |
baf76283 | 2034 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 | 2035 | |
1bce0ffa | 2036 | t = sleep_between(e, a->time.next, time_event_source_latest(b)); |
6a0f1f6d | 2037 | if (d->next == t) |
fd38203a LP |
2038 | return 0; |
2039 | ||
6a0f1f6d | 2040 | assert_se(d->fd >= 0); |
fd38203a | 2041 | |
c2ba3ad6 | 2042 | if (t == 0) { |
fd38203a LP |
2043 | /* We don' want to disarm here, just mean some time looooong ago. */ |
2044 | its.it_value.tv_sec = 0; | |
2045 | its.it_value.tv_nsec = 1; | |
2046 | } else | |
c2ba3ad6 | 2047 | timespec_store(&its.it_value, t); |
fd38203a | 2048 | |
6a0f1f6d | 2049 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 2050 | if (r < 0) |
cde93897 | 2051 | return -errno; |
fd38203a | 2052 | |
6a0f1f6d | 2053 | d->next = t; |
fd38203a LP |
2054 | return 0; |
2055 | } | |
2056 | ||
9a800b56 | 2057 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
2058 | assert(e); |
2059 | assert(s); | |
2060 | assert(s->type == SOURCE_IO); | |
2061 | ||
9a800b56 LP |
2062 | /* If the event source was already pending, we just OR in the |
2063 | * new revents, otherwise we reset the value. The ORing is | |
2064 | * necessary to handle EPOLLONESHOT events properly where | |
2065 | * readability might happen independently of writability, and | |
2066 | * we need to keep track of both */ | |
2067 | ||
2068 | if (s->pending) | |
2069 | s->io.revents |= revents; | |
2070 | else | |
2071 | s->io.revents = revents; | |
fd38203a | 2072 | |
fd38203a LP |
2073 | return source_set_pending(s, true); |
2074 | } | |
2075 | ||
72aedc1e | 2076 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2077 | uint64_t x; |
2078 | ssize_t ss; | |
2079 | ||
2080 | assert(e); | |
da7e457c | 2081 | assert(fd >= 0); |
72aedc1e | 2082 | |
305f78bf | 2083 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2084 | |
2085 | ss = read(fd, &x, sizeof(x)); | |
2086 | if (ss < 0) { | |
945c2931 | 2087 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
2088 | return 0; |
2089 | ||
2090 | return -errno; | |
2091 | } | |
2092 | ||
8d35dae7 | 2093 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2094 | return -EIO; |
2095 | ||
cde93897 | 2096 | if (next) |
3a43da28 | 2097 | *next = USEC_INFINITY; |
72aedc1e | 2098 | |
fd38203a LP |
2099 | return 0; |
2100 | } | |
2101 | ||
305f78bf LP |
2102 | static int process_timer( |
2103 | sd_event *e, | |
2104 | usec_t n, | |
6a0f1f6d | 2105 | struct clock_data *d) { |
305f78bf | 2106 | |
fd38203a LP |
2107 | sd_event_source *s; |
2108 | int r; | |
2109 | ||
2110 | assert(e); | |
6a0f1f6d | 2111 | assert(d); |
fd38203a LP |
2112 | |
2113 | for (;;) { | |
6a0f1f6d | 2114 | s = prioq_peek(d->earliest); |
fd38203a LP |
2115 | if (!s || |
2116 | s->time.next > n || | |
baf76283 | 2117 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2118 | s->pending) |
2119 | break; | |
2120 | ||
2121 | r = source_set_pending(s, true); | |
2122 | if (r < 0) | |
2123 | return r; | |
2124 | ||
6a0f1f6d LP |
2125 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2126 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 2127 | d->needs_rearm = true; |
fd38203a LP |
2128 | } |
2129 | ||
2130 | return 0; | |
2131 | } | |
2132 | ||
2133 | static int process_child(sd_event *e) { | |
2134 | sd_event_source *s; | |
2135 | Iterator i; | |
2136 | int r; | |
2137 | ||
2138 | assert(e); | |
2139 | ||
c2ba3ad6 LP |
2140 | e->need_process_child = false; |
2141 | ||
fd38203a LP |
2142 | /* |
2143 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2144 | + WNOHANG for each PID we wait for, instead of using | |
2145 | P_ALL. This is because we only want to get child | |
2146 | information of very specific child processes, and not all | |
2147 | of them. We might not have processed the SIGCHLD even of a | |
2148 | previous invocation and we don't want to maintain a | |
2149 | unbounded *per-child* event queue, hence we really don't | |
2150 | want anything flushed out of the kernel's queue that we | |
2151 | don't care about. Since this is O(n) this means that if you | |
2152 | have a lot of processes you probably want to handle SIGCHLD | |
2153 | yourself. | |
08cd1552 LP |
2154 | |
2155 | We do not reap the children here (by using WNOWAIT), this | |
2156 | is only done after the event source is dispatched so that | |
2157 | the callback still sees the process as a zombie. | |
fd38203a LP |
2158 | */ |
2159 | ||
2160 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2161 | assert(s->type == SOURCE_CHILD); | |
2162 | ||
2163 | if (s->pending) | |
2164 | continue; | |
2165 | ||
baf76283 | 2166 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2167 | continue; |
2168 | ||
2169 | zero(s->child.siginfo); | |
08cd1552 LP |
2170 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2171 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
2172 | if (r < 0) |
2173 | return -errno; | |
2174 | ||
2175 | if (s->child.siginfo.si_pid != 0) { | |
945c2931 | 2176 | bool zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 LP |
2177 | |
2178 | if (!zombie && (s->child.options & WEXITED)) { | |
2179 | /* If the child isn't dead then let's | |
2180 | * immediately remove the state change | |
2181 | * from the queue, since there's no | |
2182 | * benefit in leaving it queued */ | |
2183 | ||
2184 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2185 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2186 | } | |
2187 | ||
fd38203a LP |
2188 | r = source_set_pending(s, true); |
2189 | if (r < 0) | |
2190 | return r; | |
2191 | } | |
2192 | } | |
2193 | ||
fd38203a LP |
2194 | return 0; |
2195 | } | |
2196 | ||
9da4cb2b | 2197 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2198 | bool read_one = false; |
fd38203a LP |
2199 | int r; |
2200 | ||
da7e457c | 2201 | assert(e); |
305f78bf | 2202 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2203 | |
9da4cb2b LP |
2204 | /* If there's a signal queued on this priority and SIGCHLD is |
2205 | on this priority too, then make sure to recheck the | |
2206 | children we watch. This is because we only ever dequeue | |
2207 | the first signal per priority, and if we dequeue one, and | |
2208 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2209 | might have higher priority children we care about hence we | |
2210 | need to check that explicitly. */ | |
2211 | ||
2212 | if (sigismember(&d->sigset, SIGCHLD)) | |
2213 | e->need_process_child = true; | |
2214 | ||
2215 | /* If there's already an event source pending for this | |
2216 | * priority we don't read another */ | |
2217 | if (d->current) | |
2218 | return 0; | |
2219 | ||
fd38203a | 2220 | for (;;) { |
0eb2e0e3 | 2221 | struct signalfd_siginfo si; |
7057bd99 | 2222 | ssize_t n; |
92daebc0 | 2223 | sd_event_source *s = NULL; |
fd38203a | 2224 | |
9da4cb2b | 2225 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 2226 | if (n < 0) { |
945c2931 | 2227 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
2228 | return read_one; |
2229 | ||
2230 | return -errno; | |
2231 | } | |
2232 | ||
7057bd99 | 2233 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2234 | return -EIO; |
2235 | ||
6eb7c172 | 2236 | assert(SIGNAL_VALID(si.ssi_signo)); |
7057bd99 | 2237 | |
fd38203a LP |
2238 | read_one = true; |
2239 | ||
92daebc0 LP |
2240 | if (e->signal_sources) |
2241 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
2242 | if (!s) |
2243 | continue; | |
9da4cb2b LP |
2244 | if (s->pending) |
2245 | continue; | |
fd38203a LP |
2246 | |
2247 | s->signal.siginfo = si; | |
9da4cb2b LP |
2248 | d->current = s; |
2249 | ||
fd38203a LP |
2250 | r = source_set_pending(s, true); |
2251 | if (r < 0) | |
2252 | return r; | |
9da4cb2b LP |
2253 | |
2254 | return 1; | |
fd38203a | 2255 | } |
fd38203a LP |
2256 | } |
2257 | ||
2258 | static int source_dispatch(sd_event_source *s) { | |
8f5c235d | 2259 | EventSourceType saved_type; |
fe8245eb | 2260 | int r = 0; |
fd38203a LP |
2261 | |
2262 | assert(s); | |
6203e07a | 2263 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2264 | |
8f5c235d LP |
2265 | /* Save the event source type, here, so that we still know it after the event callback which might invalidate |
2266 | * the event. */ | |
2267 | saved_type = s->type; | |
2268 | ||
945c2931 | 2269 | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { |
da7e457c LP |
2270 | r = source_set_pending(s, false); |
2271 | if (r < 0) | |
2272 | return r; | |
2273 | } | |
fd38203a | 2274 | |
6e9feda3 LP |
2275 | if (s->type != SOURCE_POST) { |
2276 | sd_event_source *z; | |
2277 | Iterator i; | |
2278 | ||
2279 | /* If we execute a non-post source, let's mark all | |
2280 | * post sources as pending */ | |
2281 | ||
2282 | SET_FOREACH(z, s->event->post_sources, i) { | |
2283 | if (z->enabled == SD_EVENT_OFF) | |
2284 | continue; | |
2285 | ||
2286 | r = source_set_pending(z, true); | |
2287 | if (r < 0) | |
2288 | return r; | |
2289 | } | |
2290 | } | |
2291 | ||
baf76283 LP |
2292 | if (s->enabled == SD_EVENT_ONESHOT) { |
2293 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2294 | if (r < 0) |
2295 | return r; | |
2296 | } | |
2297 | ||
12179984 | 2298 | s->dispatching = true; |
b7484e2a | 2299 | |
fd38203a LP |
2300 | switch (s->type) { |
2301 | ||
2302 | case SOURCE_IO: | |
2303 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2304 | break; | |
2305 | ||
6a0f1f6d | 2306 | case SOURCE_TIME_REALTIME: |
a8548816 | 2307 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2308 | case SOURCE_TIME_MONOTONIC: |
2309 | case SOURCE_TIME_REALTIME_ALARM: | |
2310 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2311 | r = s->time.callback(s, s->time.next, s->userdata); |
2312 | break; | |
2313 | ||
2314 | case SOURCE_SIGNAL: | |
2315 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2316 | break; | |
2317 | ||
08cd1552 LP |
2318 | case SOURCE_CHILD: { |
2319 | bool zombie; | |
2320 | ||
945c2931 | 2321 | zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 | 2322 | |
fd38203a | 2323 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2324 | |
2325 | /* Now, reap the PID for good. */ | |
2326 | if (zombie) | |
2327 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2328 | ||
fd38203a | 2329 | break; |
08cd1552 | 2330 | } |
fd38203a LP |
2331 | |
2332 | case SOURCE_DEFER: | |
2333 | r = s->defer.callback(s, s->userdata); | |
2334 | break; | |
da7e457c | 2335 | |
6e9feda3 LP |
2336 | case SOURCE_POST: |
2337 | r = s->post.callback(s, s->userdata); | |
2338 | break; | |
2339 | ||
6203e07a LP |
2340 | case SOURCE_EXIT: |
2341 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2342 | break; |
9d3e3aa5 LP |
2343 | |
2344 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2345 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2346 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2347 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2348 | } |
2349 | ||
12179984 LP |
2350 | s->dispatching = false; |
2351 | ||
55cbfaa5 DM |
2352 | if (r < 0) |
2353 | log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m", | |
8f5c235d | 2354 | strna(s->description), event_source_type_to_string(saved_type)); |
12179984 LP |
2355 | |
2356 | if (s->n_ref == 0) | |
2357 | source_free(s); | |
2358 | else if (r < 0) | |
6203e07a | 2359 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2360 | |
6203e07a | 2361 | return 1; |
fd38203a LP |
2362 | } |
2363 | ||
2364 | static int event_prepare(sd_event *e) { | |
2365 | int r; | |
2366 | ||
2367 | assert(e); | |
2368 | ||
2369 | for (;;) { | |
2370 | sd_event_source *s; | |
2371 | ||
2372 | s = prioq_peek(e->prepare); | |
baf76283 | 2373 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2374 | break; |
2375 | ||
2376 | s->prepare_iteration = e->iteration; | |
2377 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2378 | if (r < 0) | |
2379 | return r; | |
2380 | ||
2381 | assert(s->prepare); | |
12179984 LP |
2382 | |
2383 | s->dispatching = true; | |
fd38203a | 2384 | r = s->prepare(s, s->userdata); |
12179984 LP |
2385 | s->dispatching = false; |
2386 | ||
55cbfaa5 DM |
2387 | if (r < 0) |
2388 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m", | |
2389 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a | 2390 | |
12179984 LP |
2391 | if (s->n_ref == 0) |
2392 | source_free(s); | |
2393 | else if (r < 0) | |
2394 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2395 | } |
2396 | ||
2397 | return 0; | |
2398 | } | |
2399 | ||
6203e07a | 2400 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2401 | sd_event_source *p; |
2402 | int r; | |
2403 | ||
2404 | assert(e); | |
2405 | ||
6203e07a | 2406 | p = prioq_peek(e->exit); |
baf76283 | 2407 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2408 | e->state = SD_EVENT_FINISHED; |
2409 | return 0; | |
2410 | } | |
2411 | ||
2412 | sd_event_ref(e); | |
2413 | e->iteration++; | |
6203e07a | 2414 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2415 | |
2416 | r = source_dispatch(p); | |
2417 | ||
2b0c9ef7 | 2418 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2419 | sd_event_unref(e); |
2420 | ||
2421 | return r; | |
2422 | } | |
2423 | ||
c2ba3ad6 LP |
2424 | static sd_event_source* event_next_pending(sd_event *e) { |
2425 | sd_event_source *p; | |
2426 | ||
da7e457c LP |
2427 | assert(e); |
2428 | ||
c2ba3ad6 LP |
2429 | p = prioq_peek(e->pending); |
2430 | if (!p) | |
2431 | return NULL; | |
2432 | ||
baf76283 | 2433 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2434 | return NULL; |
2435 | ||
2436 | return p; | |
2437 | } | |
2438 | ||
cde93897 LP |
2439 | static int arm_watchdog(sd_event *e) { |
2440 | struct itimerspec its = {}; | |
2441 | usec_t t; | |
2442 | int r; | |
2443 | ||
2444 | assert(e); | |
2445 | assert(e->watchdog_fd >= 0); | |
2446 | ||
2447 | t = sleep_between(e, | |
2448 | e->watchdog_last + (e->watchdog_period / 2), | |
2449 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2450 | ||
2451 | timespec_store(&its.it_value, t); | |
2452 | ||
75145780 LP |
2453 | /* Make sure we never set the watchdog to 0, which tells the |
2454 | * kernel to disable it. */ | |
2455 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2456 | its.it_value.tv_nsec = 1; | |
2457 | ||
cde93897 LP |
2458 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2459 | if (r < 0) | |
2460 | return -errno; | |
2461 | ||
2462 | return 0; | |
2463 | } | |
2464 | ||
2465 | static int process_watchdog(sd_event *e) { | |
2466 | assert(e); | |
2467 | ||
2468 | if (!e->watchdog) | |
2469 | return 0; | |
2470 | ||
2471 | /* Don't notify watchdog too often */ | |
2472 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2473 | return 0; | |
2474 | ||
2475 | sd_notify(false, "WATCHDOG=1"); | |
2476 | e->watchdog_last = e->timestamp.monotonic; | |
2477 | ||
2478 | return arm_watchdog(e); | |
2479 | } | |
2480 | ||
c45a5a74 TG |
2481 | _public_ int sd_event_prepare(sd_event *e) { |
2482 | int r; | |
fd38203a | 2483 | |
da7e457c | 2484 | assert_return(e, -EINVAL); |
b937d761 | 2485 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
2486 | assert_return(!event_pid_changed(e), -ECHILD); |
2487 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2488 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 2489 | |
6203e07a | 2490 | if (e->exit_requested) |
c45a5a74 | 2491 | goto pending; |
fd38203a LP |
2492 | |
2493 | e->iteration++; | |
2494 | ||
0be6c2f6 | 2495 | e->state = SD_EVENT_PREPARING; |
fd38203a | 2496 | r = event_prepare(e); |
0be6c2f6 | 2497 | e->state = SD_EVENT_INITIAL; |
fd38203a | 2498 | if (r < 0) |
c45a5a74 | 2499 | return r; |
fd38203a | 2500 | |
6a0f1f6d LP |
2501 | r = event_arm_timer(e, &e->realtime); |
2502 | if (r < 0) | |
c45a5a74 | 2503 | return r; |
6a0f1f6d | 2504 | |
a8548816 TG |
2505 | r = event_arm_timer(e, &e->boottime); |
2506 | if (r < 0) | |
c45a5a74 | 2507 | return r; |
a8548816 | 2508 | |
6a0f1f6d LP |
2509 | r = event_arm_timer(e, &e->monotonic); |
2510 | if (r < 0) | |
c45a5a74 | 2511 | return r; |
6a0f1f6d LP |
2512 | |
2513 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 2514 | if (r < 0) |
c45a5a74 | 2515 | return r; |
fd38203a | 2516 | |
6a0f1f6d | 2517 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 2518 | if (r < 0) |
c45a5a74 | 2519 | return r; |
fd38203a | 2520 | |
1b5995b0 | 2521 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
2522 | goto pending; |
2523 | ||
2b0c9ef7 | 2524 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
2525 | |
2526 | return 0; | |
2527 | ||
2528 | pending: | |
2b0c9ef7 | 2529 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2530 | r = sd_event_wait(e, 0); |
2531 | if (r == 0) | |
2b0c9ef7 | 2532 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2533 | |
2534 | return r; | |
c45a5a74 TG |
2535 | } |
2536 | ||
2537 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2538 | struct epoll_event *ev_queue; | |
2539 | unsigned ev_queue_max; | |
2540 | int r, m, i; | |
2541 | ||
2542 | assert_return(e, -EINVAL); | |
b937d761 | 2543 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
2544 | assert_return(!event_pid_changed(e), -ECHILD); |
2545 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2546 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
2547 | |
2548 | if (e->exit_requested) { | |
2549 | e->state = SD_EVENT_PENDING; | |
2550 | return 1; | |
2551 | } | |
6a0f1f6d | 2552 | |
1c724e9e | 2553 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 2554 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 2555 | |
15b38f93 | 2556 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2557 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2558 | if (m < 0) { |
c45a5a74 TG |
2559 | if (errno == EINTR) { |
2560 | e->state = SD_EVENT_PENDING; | |
2561 | return 1; | |
2562 | } | |
2563 | ||
2564 | r = -errno; | |
da7e457c LP |
2565 | goto finish; |
2566 | } | |
fd38203a | 2567 | |
e475d10c | 2568 | triple_timestamp_get(&e->timestamp); |
fd38203a LP |
2569 | |
2570 | for (i = 0; i < m; i++) { | |
2571 | ||
9da4cb2b | 2572 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2573 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
9da4cb2b LP |
2574 | else { |
2575 | WakeupType *t = ev_queue[i].data.ptr; | |
2576 | ||
2577 | switch (*t) { | |
2578 | ||
2579 | case WAKEUP_EVENT_SOURCE: | |
2580 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2581 | break; | |
fd38203a | 2582 | |
9da4cb2b LP |
2583 | case WAKEUP_CLOCK_DATA: { |
2584 | struct clock_data *d = ev_queue[i].data.ptr; | |
2585 | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); | |
2586 | break; | |
2587 | } | |
2588 | ||
2589 | case WAKEUP_SIGNAL_DATA: | |
2590 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2591 | break; | |
2592 | ||
2593 | default: | |
2594 | assert_not_reached("Invalid wake-up pointer"); | |
2595 | } | |
2596 | } | |
fd38203a | 2597 | if (r < 0) |
da7e457c | 2598 | goto finish; |
fd38203a LP |
2599 | } |
2600 | ||
cde93897 LP |
2601 | r = process_watchdog(e); |
2602 | if (r < 0) | |
2603 | goto finish; | |
2604 | ||
6a0f1f6d LP |
2605 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2606 | if (r < 0) | |
2607 | goto finish; | |
2608 | ||
e475d10c | 2609 | r = process_timer(e, e->timestamp.boottime, &e->boottime); |
a8548816 TG |
2610 | if (r < 0) |
2611 | goto finish; | |
2612 | ||
6a0f1f6d LP |
2613 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2614 | if (r < 0) | |
2615 | goto finish; | |
2616 | ||
2617 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2618 | if (r < 0) |
da7e457c | 2619 | goto finish; |
fd38203a | 2620 | |
e475d10c | 2621 | r = process_timer(e, e->timestamp.boottime, &e->boottime_alarm); |
fd38203a | 2622 | if (r < 0) |
da7e457c | 2623 | goto finish; |
fd38203a | 2624 | |
c2ba3ad6 | 2625 | if (e->need_process_child) { |
fd38203a LP |
2626 | r = process_child(e); |
2627 | if (r < 0) | |
da7e457c | 2628 | goto finish; |
fd38203a LP |
2629 | } |
2630 | ||
c45a5a74 TG |
2631 | if (event_next_pending(e)) { |
2632 | e->state = SD_EVENT_PENDING; | |
2633 | ||
2634 | return 1; | |
da7e457c LP |
2635 | } |
2636 | ||
c45a5a74 | 2637 | r = 0; |
fd38203a | 2638 | |
da7e457c | 2639 | finish: |
2b0c9ef7 | 2640 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2641 | |
2642 | return r; | |
fd38203a LP |
2643 | } |
2644 | ||
c45a5a74 TG |
2645 | _public_ int sd_event_dispatch(sd_event *e) { |
2646 | sd_event_source *p; | |
2647 | int r; | |
2648 | ||
2649 | assert_return(e, -EINVAL); | |
b937d761 | 2650 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
2651 | assert_return(!event_pid_changed(e), -ECHILD); |
2652 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2653 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
2654 | ||
2655 | if (e->exit_requested) | |
2656 | return dispatch_exit(e); | |
2657 | ||
2658 | p = event_next_pending(e); | |
2659 | if (p) { | |
2660 | sd_event_ref(e); | |
2661 | ||
2662 | e->state = SD_EVENT_RUNNING; | |
2663 | r = source_dispatch(p); | |
2b0c9ef7 | 2664 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2665 | |
2666 | sd_event_unref(e); | |
2667 | ||
2668 | return r; | |
2669 | } | |
2670 | ||
2b0c9ef7 | 2671 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2672 | |
2673 | return 1; | |
2674 | } | |
2675 | ||
34b87517 VC |
2676 | static void event_log_delays(sd_event *e) { |
2677 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1]; | |
34a6843d VC |
2678 | unsigned i; |
2679 | int o; | |
34b87517 VC |
2680 | |
2681 | for (i = o = 0; i < ELEMENTSOF(e->delays); i++) { | |
2682 | o += snprintf(&b[o], sizeof(b) - o, "%u ", e->delays[i]); | |
2683 | e->delays[i] = 0; | |
2684 | } | |
34a6843d | 2685 | log_debug("Event loop iterations: %.*s", o, b); |
34b87517 VC |
2686 | } |
2687 | ||
c45a5a74 TG |
2688 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
2689 | int r; | |
2690 | ||
2691 | assert_return(e, -EINVAL); | |
b937d761 | 2692 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
2693 | assert_return(!event_pid_changed(e), -ECHILD); |
2694 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2695 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 | 2696 | |
34b87517 VC |
2697 | if (e->profile_delays && e->last_run) { |
2698 | usec_t this_run; | |
2699 | unsigned l; | |
2700 | ||
2701 | this_run = now(CLOCK_MONOTONIC); | |
2702 | ||
2703 | l = u64log2(this_run - e->last_run); | |
2704 | assert(l < sizeof(e->delays)); | |
2705 | e->delays[l]++; | |
2706 | ||
2707 | if (this_run - e->last_log >= 5*USEC_PER_SEC) { | |
2708 | event_log_delays(e); | |
2709 | e->last_log = this_run; | |
2710 | } | |
2711 | } | |
2712 | ||
c45a5a74 | 2713 | r = sd_event_prepare(e); |
53bac4e0 LP |
2714 | if (r == 0) |
2715 | /* There was nothing? Then wait... */ | |
2716 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 2717 | |
34b87517 VC |
2718 | if (e->profile_delays) |
2719 | e->last_run = now(CLOCK_MONOTONIC); | |
2720 | ||
02d30981 | 2721 | if (r > 0) { |
53bac4e0 | 2722 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
2723 | r = sd_event_dispatch(e); |
2724 | if (r < 0) | |
2725 | return r; | |
53bac4e0 LP |
2726 | |
2727 | return 1; | |
2728 | } | |
2729 | ||
2730 | return r; | |
c45a5a74 TG |
2731 | } |
2732 | ||
f7262a9f | 2733 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2734 | int r; |
2735 | ||
da7e457c | 2736 | assert_return(e, -EINVAL); |
b937d761 | 2737 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c | 2738 | assert_return(!event_pid_changed(e), -ECHILD); |
2b0c9ef7 | 2739 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c LP |
2740 | |
2741 | sd_event_ref(e); | |
fd38203a | 2742 | |
da7e457c | 2743 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2744 | r = sd_event_run(e, (uint64_t) -1); |
2745 | if (r < 0) | |
da7e457c | 2746 | goto finish; |
fd38203a LP |
2747 | } |
2748 | ||
6203e07a | 2749 | r = e->exit_code; |
da7e457c LP |
2750 | |
2751 | finish: | |
2752 | sd_event_unref(e); | |
2753 | return r; | |
fd38203a LP |
2754 | } |
2755 | ||
9b364545 TG |
2756 | _public_ int sd_event_get_fd(sd_event *e) { |
2757 | ||
2758 | assert_return(e, -EINVAL); | |
b937d761 | 2759 | assert_return(e = event_resolve(e), -ENOPKG); |
9b364545 TG |
2760 | assert_return(!event_pid_changed(e), -ECHILD); |
2761 | ||
2762 | return e->epoll_fd; | |
2763 | } | |
2764 | ||
f7262a9f | 2765 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c | 2766 | assert_return(e, -EINVAL); |
b937d761 | 2767 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
2768 | assert_return(!event_pid_changed(e), -ECHILD); |
2769 | ||
2770 | return e->state; | |
2771 | } | |
2772 | ||
6203e07a | 2773 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2774 | assert_return(e, -EINVAL); |
b937d761 | 2775 | assert_return(e = event_resolve(e), -ENOPKG); |
6203e07a | 2776 | assert_return(code, -EINVAL); |
da7e457c | 2777 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2778 | |
6203e07a LP |
2779 | if (!e->exit_requested) |
2780 | return -ENODATA; | |
2781 | ||
2782 | *code = e->exit_code; | |
2783 | return 0; | |
fd38203a LP |
2784 | } |
2785 | ||
6203e07a | 2786 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c | 2787 | assert_return(e, -EINVAL); |
b937d761 | 2788 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
2789 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
2790 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2791 | |
6203e07a LP |
2792 | e->exit_requested = true; |
2793 | e->exit_code = code; | |
2794 | ||
fd38203a LP |
2795 | return 0; |
2796 | } | |
46e8c825 | 2797 | |
6a0f1f6d | 2798 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 | 2799 | assert_return(e, -EINVAL); |
b937d761 | 2800 | assert_return(e = event_resolve(e), -ENOPKG); |
46e8c825 | 2801 | assert_return(usec, -EINVAL); |
46e8c825 LP |
2802 | assert_return(!event_pid_changed(e), -ECHILD); |
2803 | ||
e475d10c LP |
2804 | if (!TRIPLE_TIMESTAMP_HAS_CLOCK(clock)) |
2805 | return -EOPNOTSUPP; | |
2806 | ||
2807 | /* Generate a clean error in case CLOCK_BOOTTIME is not available. Note that don't use clock_supported() here, | |
2808 | * for a reason: there are systems where CLOCK_BOOTTIME is supported, but CLOCK_BOOTTIME_ALARM is not, but for | |
2809 | * the purpose of getting the time this doesn't matter. */ | |
3411372e LP |
2810 | if (IN_SET(clock, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM) && !clock_boottime_supported()) |
2811 | return -EOPNOTSUPP; | |
2812 | ||
e475d10c | 2813 | if (!triple_timestamp_is_set(&e->timestamp)) { |
38a03f06 LP |
2814 | /* Implicitly fall back to now() if we never ran |
2815 | * before and thus have no cached time. */ | |
2816 | *usec = now(clock); | |
2817 | return 1; | |
2818 | } | |
46e8c825 | 2819 | |
e475d10c | 2820 | *usec = triple_timestamp_by_clock(&e->timestamp, clock); |
46e8c825 LP |
2821 | return 0; |
2822 | } | |
afc6adb5 LP |
2823 | |
2824 | _public_ int sd_event_default(sd_event **ret) { | |
39883f62 | 2825 | sd_event *e = NULL; |
afc6adb5 LP |
2826 | int r; |
2827 | ||
2828 | if (!ret) | |
2829 | return !!default_event; | |
2830 | ||
2831 | if (default_event) { | |
2832 | *ret = sd_event_ref(default_event); | |
2833 | return 0; | |
2834 | } | |
2835 | ||
2836 | r = sd_event_new(&e); | |
2837 | if (r < 0) | |
2838 | return r; | |
2839 | ||
2840 | e->default_event_ptr = &default_event; | |
2841 | e->tid = gettid(); | |
2842 | default_event = e; | |
2843 | ||
2844 | *ret = e; | |
2845 | return 1; | |
2846 | } | |
2847 | ||
2848 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2849 | assert_return(e, -EINVAL); | |
b937d761 | 2850 | assert_return(e = event_resolve(e), -ENOPKG); |
afc6adb5 | 2851 | assert_return(tid, -EINVAL); |
76b54375 | 2852 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2853 | |
76b54375 LP |
2854 | if (e->tid != 0) { |
2855 | *tid = e->tid; | |
2856 | return 0; | |
2857 | } | |
2858 | ||
2859 | return -ENXIO; | |
afc6adb5 | 2860 | } |
cde93897 LP |
2861 | |
2862 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2863 | int r; | |
2864 | ||
2865 | assert_return(e, -EINVAL); | |
b937d761 | 2866 | assert_return(e = event_resolve(e), -ENOPKG); |
8f726607 | 2867 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2868 | |
2869 | if (e->watchdog == !!b) | |
2870 | return e->watchdog; | |
2871 | ||
2872 | if (b) { | |
2873 | struct epoll_event ev = {}; | |
cde93897 | 2874 | |
09812eb7 LP |
2875 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2876 | if (r <= 0) | |
cde93897 | 2877 | return r; |
cde93897 LP |
2878 | |
2879 | /* Issue first ping immediately */ | |
2880 | sd_notify(false, "WATCHDOG=1"); | |
2881 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2882 | ||
2883 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2884 | if (e->watchdog_fd < 0) | |
2885 | return -errno; | |
2886 | ||
2887 | r = arm_watchdog(e); | |
2888 | if (r < 0) | |
2889 | goto fail; | |
2890 | ||
2891 | ev.events = EPOLLIN; | |
2892 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2893 | ||
2894 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2895 | if (r < 0) { | |
2896 | r = -errno; | |
2897 | goto fail; | |
2898 | } | |
2899 | ||
2900 | } else { | |
2901 | if (e->watchdog_fd >= 0) { | |
2902 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2903 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2904 | } |
2905 | } | |
2906 | ||
2907 | e->watchdog = !!b; | |
2908 | return e->watchdog; | |
2909 | ||
2910 | fail: | |
03e334a1 | 2911 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2912 | return r; |
2913 | } | |
8f726607 LP |
2914 | |
2915 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2916 | assert_return(e, -EINVAL); | |
b937d761 | 2917 | assert_return(e = event_resolve(e), -ENOPKG); |
8f726607 LP |
2918 | assert_return(!event_pid_changed(e), -ECHILD); |
2919 | ||
2920 | return e->watchdog; | |
2921 | } | |
60a3b1e1 LP |
2922 | |
2923 | _public_ int sd_event_get_iteration(sd_event *e, uint64_t *ret) { | |
2924 | assert_return(e, -EINVAL); | |
b937d761 | 2925 | assert_return(e = event_resolve(e), -ENOPKG); |
60a3b1e1 LP |
2926 | assert_return(!event_pid_changed(e), -ECHILD); |
2927 | ||
2928 | *ret = e->iteration; | |
2929 | return 0; | |
2930 | } |