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