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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); | |
664 | if (r < 0) | |
665 | return r; | |
f95387cd | 666 | |
9da4cb2b LP |
667 | added = true; |
668 | } | |
669 | ||
670 | ss_copy = d->sigset; | |
671 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
672 | ||
673 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
674 | if (r < 0) { | |
675 | r = -errno; | |
676 | goto fail; | |
677 | } | |
678 | ||
679 | d->sigset = ss_copy; | |
f95387cd | 680 | |
9da4cb2b LP |
681 | if (d->fd >= 0) { |
682 | if (ret) | |
683 | *ret = d; | |
f95387cd | 684 | return 0; |
9da4cb2b LP |
685 | } |
686 | ||
687 | d->fd = r; | |
f95387cd ZJS |
688 | |
689 | ev.events = EPOLLIN; | |
9da4cb2b | 690 | ev.data.ptr = d; |
f95387cd | 691 | |
9da4cb2b LP |
692 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
693 | if (r < 0) { | |
694 | r = -errno; | |
695 | goto fail; | |
f95387cd ZJS |
696 | } |
697 | ||
9da4cb2b LP |
698 | if (ret) |
699 | *ret = d; | |
700 | ||
f95387cd | 701 | return 0; |
9da4cb2b LP |
702 | |
703 | fail: | |
704 | if (added) { | |
705 | d->fd = safe_close(d->fd); | |
706 | hashmap_remove(e->signal_data, &d->priority); | |
707 | free(d); | |
708 | } | |
709 | ||
710 | return r; | |
711 | } | |
712 | ||
713 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
714 | assert(e); | |
715 | assert(d); | |
716 | ||
717 | /* Turns off the specified signal in the signal data | |
718 | * object. If the signal mask of the object becomes empty that | |
719 | * way removes it. */ | |
720 | ||
721 | if (sigismember(&d->sigset, sig) == 0) | |
722 | return; | |
723 | ||
724 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
725 | ||
726 | if (sigisemptyset(&d->sigset)) { | |
727 | ||
728 | /* If all the mask is all-zero we can get rid of the structure */ | |
729 | hashmap_remove(e->signal_data, &d->priority); | |
730 | assert(!d->current); | |
731 | safe_close(d->fd); | |
732 | free(d); | |
733 | return; | |
734 | } | |
735 | ||
736 | assert(d->fd >= 0); | |
737 | ||
738 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
739 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
740 | } | |
741 | ||
742 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
743 | struct signal_data *d; | |
744 | static const int64_t zero_priority = 0; | |
745 | ||
746 | assert(e); | |
747 | ||
748 | /* Rechecks if the specified signal is still something we are | |
749 | * interested in. If not, we'll unmask it, and possibly drop | |
750 | * the signalfd for it. */ | |
751 | ||
752 | if (sig == SIGCHLD && | |
753 | e->n_enabled_child_sources > 0) | |
754 | return; | |
755 | ||
756 | if (e->signal_sources && | |
757 | e->signal_sources[sig] && | |
758 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
759 | return; | |
760 | ||
761 | /* | |
762 | * The specified signal might be enabled in three different queues: | |
763 | * | |
764 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
765 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
766 | * 3) the 0 priority (to cover the SIGCHLD case) | |
767 | * | |
768 | * Hence, let's remove it from all three here. | |
769 | */ | |
770 | ||
771 | if (priority) { | |
772 | d = hashmap_get(e->signal_data, priority); | |
773 | if (d) | |
774 | event_unmask_signal_data(e, d, sig); | |
775 | } | |
776 | ||
777 | if (e->signal_sources && e->signal_sources[sig]) { | |
778 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
779 | if (d) | |
780 | event_unmask_signal_data(e, d, sig); | |
781 | } | |
782 | ||
783 | d = hashmap_get(e->signal_data, &zero_priority); | |
784 | if (d) | |
785 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
786 | } |
787 | ||
a71fe8b8 LP |
788 | static void source_disconnect(sd_event_source *s) { |
789 | sd_event *event; | |
790 | ||
fd38203a LP |
791 | assert(s); |
792 | ||
a71fe8b8 LP |
793 | if (!s->event) |
794 | return; | |
15b38f93 | 795 | |
a71fe8b8 | 796 | assert(s->event->n_sources > 0); |
fd38203a | 797 | |
a71fe8b8 | 798 | switch (s->type) { |
fd38203a | 799 | |
a71fe8b8 LP |
800 | case SOURCE_IO: |
801 | if (s->io.fd >= 0) | |
802 | source_io_unregister(s); | |
fd38203a | 803 | |
a71fe8b8 | 804 | break; |
6a0f1f6d | 805 | |
a71fe8b8 | 806 | case SOURCE_TIME_REALTIME: |
a8548816 | 807 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
808 | case SOURCE_TIME_MONOTONIC: |
809 | case SOURCE_TIME_REALTIME_ALARM: | |
810 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
811 | struct clock_data *d; | |
fd38203a | 812 | |
a71fe8b8 LP |
813 | d = event_get_clock_data(s->event, s->type); |
814 | assert(d); | |
815 | ||
816 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
817 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 818 | d->needs_rearm = true; |
a71fe8b8 LP |
819 | break; |
820 | } | |
821 | ||
822 | case SOURCE_SIGNAL: | |
823 | if (s->signal.sig > 0) { | |
9da4cb2b | 824 | |
a71fe8b8 LP |
825 | if (s->event->signal_sources) |
826 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 827 | |
9da4cb2b | 828 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 829 | } |
fd38203a | 830 | |
a71fe8b8 | 831 | break; |
fd38203a | 832 | |
a71fe8b8 LP |
833 | case SOURCE_CHILD: |
834 | if (s->child.pid > 0) { | |
835 | if (s->enabled != SD_EVENT_OFF) { | |
836 | assert(s->event->n_enabled_child_sources > 0); | |
837 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 838 | } |
fd38203a | 839 | |
4a0b58c4 | 840 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
9da4cb2b | 841 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
a71fe8b8 | 842 | } |
fd38203a | 843 | |
a71fe8b8 | 844 | break; |
fd38203a | 845 | |
a71fe8b8 LP |
846 | case SOURCE_DEFER: |
847 | /* nothing */ | |
848 | break; | |
fd38203a | 849 | |
a71fe8b8 LP |
850 | case SOURCE_POST: |
851 | set_remove(s->event->post_sources, s); | |
852 | break; | |
da7e457c | 853 | |
a71fe8b8 LP |
854 | case SOURCE_EXIT: |
855 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
856 | break; | |
0eb2e0e3 | 857 | |
a71fe8b8 LP |
858 | default: |
859 | assert_not_reached("Wut? I shouldn't exist."); | |
860 | } | |
6e9feda3 | 861 | |
a71fe8b8 LP |
862 | if (s->pending) |
863 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 864 | |
a71fe8b8 LP |
865 | if (s->prepare) |
866 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 867 | |
a71fe8b8 | 868 | event = s->event; |
fd38203a | 869 | |
a71fe8b8 LP |
870 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
871 | s->event = NULL; | |
872 | LIST_REMOVE(sources, event->sources, s); | |
873 | event->n_sources--; | |
fd38203a | 874 | |
a71fe8b8 LP |
875 | if (!s->floating) |
876 | sd_event_unref(event); | |
877 | } | |
878 | ||
879 | static void source_free(sd_event_source *s) { | |
880 | assert(s); | |
fd38203a | 881 | |
a71fe8b8 | 882 | source_disconnect(s); |
356779df | 883 | free(s->description); |
fd38203a LP |
884 | free(s); |
885 | } | |
886 | ||
887 | static int source_set_pending(sd_event_source *s, bool b) { | |
888 | int r; | |
889 | ||
890 | assert(s); | |
6203e07a | 891 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
892 | |
893 | if (s->pending == b) | |
894 | return 0; | |
895 | ||
896 | s->pending = b; | |
897 | ||
898 | if (b) { | |
899 | s->pending_iteration = s->event->iteration; | |
900 | ||
901 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
902 | if (r < 0) { | |
903 | s->pending = false; | |
904 | return r; | |
905 | } | |
906 | } else | |
907 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
908 | ||
6a0f1f6d LP |
909 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
910 | struct clock_data *d; | |
911 | ||
912 | d = event_get_clock_data(s->event, s->type); | |
913 | assert(d); | |
914 | ||
915 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
916 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 917 | d->needs_rearm = true; |
2576a19e LP |
918 | } |
919 | ||
9da4cb2b LP |
920 | if (s->type == SOURCE_SIGNAL && !b) { |
921 | struct signal_data *d; | |
922 | ||
923 | d = hashmap_get(s->event->signal_data, &s->priority); | |
924 | if (d && d->current == s) | |
925 | d->current = NULL; | |
926 | } | |
927 | ||
fd38203a LP |
928 | return 0; |
929 | } | |
930 | ||
a71fe8b8 | 931 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
932 | sd_event_source *s; |
933 | ||
934 | assert(e); | |
935 | ||
936 | s = new0(sd_event_source, 1); | |
937 | if (!s) | |
938 | return NULL; | |
939 | ||
da7e457c | 940 | s->n_ref = 1; |
a71fe8b8 | 941 | s->event = e; |
4a134c49 | 942 | s->floating = floating; |
fd38203a | 943 | s->type = type; |
fd38203a | 944 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
945 | |
946 | if (!floating) | |
947 | sd_event_ref(e); | |
fd38203a | 948 | |
a71fe8b8 | 949 | LIST_PREPEND(sources, e->sources, s); |
15b38f93 LP |
950 | e->n_sources ++; |
951 | ||
fd38203a LP |
952 | return s; |
953 | } | |
954 | ||
f7262a9f | 955 | _public_ int sd_event_add_io( |
fd38203a | 956 | sd_event *e, |
151b9b96 | 957 | sd_event_source **ret, |
fd38203a LP |
958 | int fd, |
959 | uint32_t events, | |
718db961 | 960 | sd_event_io_handler_t callback, |
151b9b96 | 961 | void *userdata) { |
fd38203a LP |
962 | |
963 | sd_event_source *s; | |
964 | int r; | |
965 | ||
305f78bf | 966 | assert_return(e, -EINVAL); |
8ac43fee | 967 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 968 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 969 | assert_return(callback, -EINVAL); |
da7e457c | 970 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 971 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 972 | |
a71fe8b8 | 973 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
974 | if (!s) |
975 | return -ENOMEM; | |
976 | ||
9da4cb2b | 977 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
978 | s->io.fd = fd; |
979 | s->io.events = events; | |
980 | s->io.callback = callback; | |
981 | s->userdata = userdata; | |
baf76283 | 982 | s->enabled = SD_EVENT_ON; |
fd38203a | 983 | |
baf76283 | 984 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
985 | if (r < 0) { |
986 | source_free(s); | |
050f74f2 | 987 | return r; |
fd38203a LP |
988 | } |
989 | ||
a71fe8b8 LP |
990 | if (ret) |
991 | *ret = s; | |
992 | ||
fd38203a LP |
993 | return 0; |
994 | } | |
995 | ||
52444dc4 LP |
996 | static void initialize_perturb(sd_event *e) { |
997 | sd_id128_t bootid = {}; | |
998 | ||
999 | /* When we sleep for longer, we try to realign the wakeup to | |
1000 | the same time wihtin each minute/second/250ms, so that | |
1001 | events all across the system can be coalesced into a single | |
1002 | CPU wakeup. However, let's take some system-specific | |
1003 | randomness for this value, so that in a network of systems | |
1004 | with synced clocks timer events are distributed a | |
1005 | bit. Here, we calculate a perturbation usec offset from the | |
1006 | boot ID. */ | |
1007 | ||
3a43da28 | 1008 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
1009 | return; |
1010 | ||
1011 | if (sd_id128_get_boot(&bootid) >= 0) | |
1012 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
1013 | } | |
1014 | ||
fd38203a LP |
1015 | static int event_setup_timer_fd( |
1016 | sd_event *e, | |
6a0f1f6d LP |
1017 | struct clock_data *d, |
1018 | clockid_t clock) { | |
fd38203a LP |
1019 | |
1020 | struct epoll_event ev = {}; | |
1021 | int r, fd; | |
1022 | ||
1023 | assert(e); | |
6a0f1f6d | 1024 | assert(d); |
fd38203a | 1025 | |
6a0f1f6d | 1026 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
1027 | return 0; |
1028 | ||
6a0f1f6d | 1029 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
1030 | if (fd < 0) |
1031 | return -errno; | |
1032 | ||
1033 | ev.events = EPOLLIN; | |
9da4cb2b | 1034 | ev.data.ptr = d; |
fd38203a LP |
1035 | |
1036 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
1037 | if (r < 0) { | |
03e334a1 | 1038 | safe_close(fd); |
fd38203a LP |
1039 | return -errno; |
1040 | } | |
1041 | ||
6a0f1f6d | 1042 | d->fd = fd; |
fd38203a LP |
1043 | return 0; |
1044 | } | |
1045 | ||
c4f1aff2 TG |
1046 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1047 | assert(s); | |
1048 | ||
1049 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1050 | } | |
1051 | ||
6a0f1f6d | 1052 | _public_ int sd_event_add_time( |
fd38203a | 1053 | sd_event *e, |
151b9b96 | 1054 | sd_event_source **ret, |
6a0f1f6d | 1055 | clockid_t clock, |
fd38203a | 1056 | uint64_t usec, |
c2ba3ad6 | 1057 | uint64_t accuracy, |
718db961 | 1058 | sd_event_time_handler_t callback, |
151b9b96 | 1059 | void *userdata) { |
fd38203a | 1060 | |
6a0f1f6d | 1061 | EventSourceType type; |
fd38203a | 1062 | sd_event_source *s; |
6a0f1f6d | 1063 | struct clock_data *d; |
fd38203a LP |
1064 | int r; |
1065 | ||
305f78bf | 1066 | assert_return(e, -EINVAL); |
305f78bf LP |
1067 | assert_return(usec != (uint64_t) -1, -EINVAL); |
1068 | assert_return(accuracy != (uint64_t) -1, -EINVAL); | |
da7e457c | 1069 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1070 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1071 | |
c4f1aff2 TG |
1072 | if (!callback) |
1073 | callback = time_exit_callback; | |
1074 | ||
6a0f1f6d | 1075 | type = clock_to_event_source_type(clock); |
15411c0c | 1076 | assert_return(type >= 0, -EOPNOTSUPP); |
6a0f1f6d LP |
1077 | |
1078 | d = event_get_clock_data(e, type); | |
1079 | assert(d); | |
c2ba3ad6 | 1080 | |
c983e776 EV |
1081 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1082 | if (r < 0) | |
1083 | return r; | |
fd38203a | 1084 | |
c983e776 EV |
1085 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1086 | if (r < 0) | |
1087 | return r; | |
fd38203a | 1088 | |
6a0f1f6d LP |
1089 | if (d->fd < 0) { |
1090 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1091 | if (r < 0) |
1092 | return r; | |
1093 | } | |
1094 | ||
a71fe8b8 | 1095 | s = source_new(e, !ret, type); |
fd38203a LP |
1096 | if (!s) |
1097 | return -ENOMEM; | |
1098 | ||
1099 | s->time.next = usec; | |
c2ba3ad6 | 1100 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1101 | s->time.callback = callback; |
da7e457c | 1102 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1103 | s->userdata = userdata; |
baf76283 | 1104 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1105 | |
e07bbb7c TG |
1106 | d->needs_rearm = true; |
1107 | ||
6a0f1f6d | 1108 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
1109 | if (r < 0) |
1110 | goto fail; | |
1111 | ||
6a0f1f6d | 1112 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
1113 | if (r < 0) |
1114 | goto fail; | |
fd38203a | 1115 | |
a71fe8b8 LP |
1116 | if (ret) |
1117 | *ret = s; | |
1118 | ||
fd38203a | 1119 | return 0; |
c2ba3ad6 LP |
1120 | |
1121 | fail: | |
1122 | source_free(s); | |
1123 | return r; | |
fd38203a LP |
1124 | } |
1125 | ||
59bc1fd7 LP |
1126 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1127 | assert(s); | |
1128 | ||
1129 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1130 | } | |
1131 | ||
f7262a9f | 1132 | _public_ int sd_event_add_signal( |
305f78bf | 1133 | sd_event *e, |
151b9b96 | 1134 | sd_event_source **ret, |
305f78bf | 1135 | int sig, |
718db961 | 1136 | sd_event_signal_handler_t callback, |
151b9b96 | 1137 | void *userdata) { |
305f78bf | 1138 | |
fd38203a | 1139 | sd_event_source *s; |
9da4cb2b | 1140 | struct signal_data *d; |
3022d74b | 1141 | sigset_t ss; |
fd38203a LP |
1142 | int r; |
1143 | ||
305f78bf LP |
1144 | assert_return(e, -EINVAL); |
1145 | assert_return(sig > 0, -EINVAL); | |
1146 | assert_return(sig < _NSIG, -EINVAL); | |
da7e457c | 1147 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1148 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1149 | |
59bc1fd7 LP |
1150 | if (!callback) |
1151 | callback = signal_exit_callback; | |
1152 | ||
3022d74b | 1153 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
50e0d56c LP |
1154 | if (r != 0) |
1155 | return -r; | |
3022d74b LP |
1156 | |
1157 | if (!sigismember(&ss, sig)) | |
1158 | return -EBUSY; | |
1159 | ||
fd38203a LP |
1160 | if (!e->signal_sources) { |
1161 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1162 | if (!e->signal_sources) | |
1163 | return -ENOMEM; | |
1164 | } else if (e->signal_sources[sig]) | |
1165 | return -EBUSY; | |
1166 | ||
a71fe8b8 | 1167 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1168 | if (!s) |
1169 | return -ENOMEM; | |
1170 | ||
1171 | s->signal.sig = sig; | |
1172 | s->signal.callback = callback; | |
1173 | s->userdata = userdata; | |
baf76283 | 1174 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1175 | |
1176 | e->signal_sources[sig] = s; | |
fd38203a | 1177 | |
9da4cb2b LP |
1178 | r = event_make_signal_data(e, sig, &d); |
1179 | if (r < 0) { | |
1180 | source_free(s); | |
1181 | return r; | |
fd38203a LP |
1182 | } |
1183 | ||
f1f00dbb LP |
1184 | /* Use the signal name as description for the event source by default */ |
1185 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1186 | ||
a71fe8b8 LP |
1187 | if (ret) |
1188 | *ret = s; | |
1189 | ||
fd38203a LP |
1190 | return 0; |
1191 | } | |
1192 | ||
f7262a9f | 1193 | _public_ int sd_event_add_child( |
305f78bf | 1194 | sd_event *e, |
151b9b96 | 1195 | sd_event_source **ret, |
305f78bf LP |
1196 | pid_t pid, |
1197 | int options, | |
718db961 | 1198 | sd_event_child_handler_t callback, |
151b9b96 | 1199 | void *userdata) { |
305f78bf | 1200 | |
fd38203a LP |
1201 | sd_event_source *s; |
1202 | int r; | |
1203 | ||
305f78bf LP |
1204 | assert_return(e, -EINVAL); |
1205 | assert_return(pid > 1, -EINVAL); | |
1206 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1207 | assert_return(options != 0, -EINVAL); | |
1208 | assert_return(callback, -EINVAL); | |
da7e457c | 1209 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1210 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1211 | |
d5099efc | 1212 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1213 | if (r < 0) |
1214 | return r; | |
1215 | ||
4a0b58c4 | 1216 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1217 | return -EBUSY; |
1218 | ||
a71fe8b8 | 1219 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1220 | if (!s) |
1221 | return -ENOMEM; | |
1222 | ||
1223 | s->child.pid = pid; | |
1224 | s->child.options = options; | |
1225 | s->child.callback = callback; | |
1226 | s->userdata = userdata; | |
baf76283 | 1227 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1228 | |
4a0b58c4 | 1229 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
fd38203a LP |
1230 | if (r < 0) { |
1231 | source_free(s); | |
1232 | return r; | |
1233 | } | |
1234 | ||
baf76283 | 1235 | e->n_enabled_child_sources ++; |
fd38203a | 1236 | |
9da4cb2b LP |
1237 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1238 | if (r < 0) { | |
1239 | e->n_enabled_child_sources--; | |
1240 | source_free(s); | |
1241 | return r; | |
fd38203a LP |
1242 | } |
1243 | ||
c2ba3ad6 LP |
1244 | e->need_process_child = true; |
1245 | ||
a71fe8b8 LP |
1246 | if (ret) |
1247 | *ret = s; | |
1248 | ||
fd38203a LP |
1249 | return 0; |
1250 | } | |
1251 | ||
f7262a9f | 1252 | _public_ int sd_event_add_defer( |
305f78bf | 1253 | sd_event *e, |
151b9b96 | 1254 | sd_event_source **ret, |
718db961 | 1255 | sd_event_handler_t callback, |
151b9b96 | 1256 | void *userdata) { |
305f78bf | 1257 | |
fd38203a LP |
1258 | sd_event_source *s; |
1259 | int r; | |
1260 | ||
305f78bf LP |
1261 | assert_return(e, -EINVAL); |
1262 | assert_return(callback, -EINVAL); | |
da7e457c | 1263 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1264 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1265 | |
a71fe8b8 | 1266 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1267 | if (!s) |
1268 | return -ENOMEM; | |
1269 | ||
1270 | s->defer.callback = callback; | |
1271 | s->userdata = userdata; | |
baf76283 | 1272 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1273 | |
1274 | r = source_set_pending(s, true); | |
1275 | if (r < 0) { | |
1276 | source_free(s); | |
1277 | return r; | |
1278 | } | |
1279 | ||
a71fe8b8 LP |
1280 | if (ret) |
1281 | *ret = s; | |
1282 | ||
fd38203a LP |
1283 | return 0; |
1284 | } | |
1285 | ||
6e9feda3 LP |
1286 | _public_ int sd_event_add_post( |
1287 | sd_event *e, | |
1288 | sd_event_source **ret, | |
1289 | sd_event_handler_t callback, | |
1290 | void *userdata) { | |
1291 | ||
1292 | sd_event_source *s; | |
1293 | int r; | |
1294 | ||
1295 | assert_return(e, -EINVAL); | |
1296 | assert_return(callback, -EINVAL); | |
6e9feda3 LP |
1297 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1298 | assert_return(!event_pid_changed(e), -ECHILD); | |
1299 | ||
d5099efc | 1300 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1301 | if (r < 0) |
1302 | return r; | |
1303 | ||
a71fe8b8 | 1304 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1305 | if (!s) |
1306 | return -ENOMEM; | |
1307 | ||
1308 | s->post.callback = callback; | |
1309 | s->userdata = userdata; | |
1310 | s->enabled = SD_EVENT_ON; | |
1311 | ||
1312 | r = set_put(e->post_sources, s); | |
1313 | if (r < 0) { | |
1314 | source_free(s); | |
1315 | return r; | |
1316 | } | |
1317 | ||
a71fe8b8 LP |
1318 | if (ret) |
1319 | *ret = s; | |
1320 | ||
6e9feda3 LP |
1321 | return 0; |
1322 | } | |
1323 | ||
6203e07a | 1324 | _public_ int sd_event_add_exit( |
305f78bf | 1325 | sd_event *e, |
151b9b96 | 1326 | sd_event_source **ret, |
718db961 | 1327 | sd_event_handler_t callback, |
151b9b96 | 1328 | void *userdata) { |
305f78bf | 1329 | |
da7e457c LP |
1330 | sd_event_source *s; |
1331 | int r; | |
1332 | ||
1333 | assert_return(e, -EINVAL); | |
1334 | assert_return(callback, -EINVAL); | |
1335 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1336 | assert_return(!event_pid_changed(e), -ECHILD); | |
1337 | ||
c983e776 EV |
1338 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1339 | if (r < 0) | |
1340 | return r; | |
da7e457c | 1341 | |
a71fe8b8 | 1342 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1343 | if (!s) |
da7e457c | 1344 | return -ENOMEM; |
fd38203a | 1345 | |
6203e07a | 1346 | s->exit.callback = callback; |
da7e457c | 1347 | s->userdata = userdata; |
6203e07a | 1348 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1349 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1350 | |
6203e07a | 1351 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1352 | if (r < 0) { |
1353 | source_free(s); | |
1354 | return r; | |
1355 | } | |
1356 | ||
a71fe8b8 LP |
1357 | if (ret) |
1358 | *ret = s; | |
1359 | ||
da7e457c LP |
1360 | return 0; |
1361 | } | |
1362 | ||
f7262a9f | 1363 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
6680dd6b LP |
1364 | |
1365 | if (!s) | |
1366 | return NULL; | |
da7e457c LP |
1367 | |
1368 | assert(s->n_ref >= 1); | |
1369 | s->n_ref++; | |
fd38203a LP |
1370 | |
1371 | return s; | |
1372 | } | |
1373 | ||
f7262a9f | 1374 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1375 | |
1376 | if (!s) | |
1377 | return NULL; | |
fd38203a | 1378 | |
da7e457c LP |
1379 | assert(s->n_ref >= 1); |
1380 | s->n_ref--; | |
1381 | ||
12179984 LP |
1382 | if (s->n_ref <= 0) { |
1383 | /* Here's a special hack: when we are called from a | |
1384 | * dispatch handler we won't free the event source | |
1385 | * immediately, but we will detach the fd from the | |
1386 | * epoll. This way it is safe for the caller to unref | |
1387 | * the event source and immediately close the fd, but | |
1388 | * we still retain a valid event source object after | |
1389 | * the callback. */ | |
1390 | ||
1391 | if (s->dispatching) { | |
1392 | if (s->type == SOURCE_IO) | |
1393 | source_io_unregister(s); | |
a71fe8b8 LP |
1394 | |
1395 | source_disconnect(s); | |
12179984 LP |
1396 | } else |
1397 | source_free(s); | |
1398 | } | |
fd38203a LP |
1399 | |
1400 | return NULL; | |
1401 | } | |
1402 | ||
356779df | 1403 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1404 | assert_return(s, -EINVAL); |
f4b2933e | 1405 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1406 | |
356779df | 1407 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1408 | } |
1409 | ||
356779df | 1410 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1411 | assert_return(s, -EINVAL); |
356779df | 1412 | assert_return(description, -EINVAL); |
f4b2933e LP |
1413 | assert_return(s->description, -ENXIO); |
1414 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
f7f53e9e | 1415 | |
356779df | 1416 | *description = s->description; |
f7f53e9e TG |
1417 | return 0; |
1418 | } | |
1419 | ||
adcc4ca3 | 1420 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1421 | assert_return(s, NULL); |
eaa3cbef LP |
1422 | |
1423 | return s->event; | |
1424 | } | |
1425 | ||
f7262a9f | 1426 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1427 | assert_return(s, -EINVAL); |
6203e07a | 1428 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1429 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1430 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1431 | |
1432 | return s->pending; | |
1433 | } | |
1434 | ||
f7262a9f | 1435 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1436 | assert_return(s, -EINVAL); |
1437 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1438 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1439 | |
1440 | return s->io.fd; | |
1441 | } | |
1442 | ||
30caf8f3 LP |
1443 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1444 | int r; | |
1445 | ||
1446 | assert_return(s, -EINVAL); | |
8ac43fee | 1447 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1448 | assert_return(s->type == SOURCE_IO, -EDOM); |
1449 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1450 | ||
1451 | if (s->io.fd == fd) | |
1452 | return 0; | |
1453 | ||
1454 | if (s->enabled == SD_EVENT_OFF) { | |
1455 | s->io.fd = fd; | |
1456 | s->io.registered = false; | |
1457 | } else { | |
1458 | int saved_fd; | |
1459 | ||
1460 | saved_fd = s->io.fd; | |
1461 | assert(s->io.registered); | |
1462 | ||
1463 | s->io.fd = fd; | |
1464 | s->io.registered = false; | |
1465 | ||
1466 | r = source_io_register(s, s->enabled, s->io.events); | |
1467 | if (r < 0) { | |
1468 | s->io.fd = saved_fd; | |
1469 | s->io.registered = true; | |
1470 | return r; | |
1471 | } | |
1472 | ||
1473 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1474 | } | |
1475 | ||
1476 | return 0; | |
1477 | } | |
1478 | ||
f7262a9f | 1479 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1480 | assert_return(s, -EINVAL); |
1481 | assert_return(events, -EINVAL); | |
1482 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1483 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1484 | |
1485 | *events = s->io.events; | |
1486 | return 0; | |
1487 | } | |
1488 | ||
f7262a9f | 1489 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1490 | int r; |
1491 | ||
305f78bf LP |
1492 | assert_return(s, -EINVAL); |
1493 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1494 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1495 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1496 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1497 | |
b63c8d4f DH |
1498 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1499 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1500 | return 0; |
1501 | ||
baf76283 | 1502 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1503 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1504 | if (r < 0) |
1505 | return r; | |
1506 | } | |
1507 | ||
1508 | s->io.events = events; | |
503f39c3 | 1509 | source_set_pending(s, false); |
fd38203a LP |
1510 | |
1511 | return 0; | |
1512 | } | |
1513 | ||
f7262a9f | 1514 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1515 | assert_return(s, -EINVAL); |
1516 | assert_return(revents, -EINVAL); | |
1517 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1518 | assert_return(s->pending, -ENODATA); | |
1519 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1520 | |
1521 | *revents = s->io.revents; | |
1522 | return 0; | |
1523 | } | |
1524 | ||
f7262a9f | 1525 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1526 | assert_return(s, -EINVAL); |
1527 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1528 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1529 | |
1530 | return s->signal.sig; | |
1531 | } | |
1532 | ||
31927c16 | 1533 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1534 | assert_return(s, -EINVAL); |
1535 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1536 | |
1537 | return s->priority; | |
1538 | } | |
1539 | ||
31927c16 | 1540 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
9da4cb2b LP |
1541 | int r; |
1542 | ||
305f78bf | 1543 | assert_return(s, -EINVAL); |
da7e457c | 1544 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1545 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1546 | |
1547 | if (s->priority == priority) | |
1548 | return 0; | |
1549 | ||
9da4cb2b LP |
1550 | if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { |
1551 | struct signal_data *old, *d; | |
1552 | ||
1553 | /* Move us from the signalfd belonging to the old | |
1554 | * priority to the signalfd of the new priority */ | |
1555 | ||
1556 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
1557 | ||
1558 | s->priority = priority; | |
1559 | ||
1560 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
1561 | if (r < 0) { | |
1562 | s->priority = old->priority; | |
1563 | return r; | |
1564 | } | |
1565 | ||
1566 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
1567 | } else | |
1568 | s->priority = priority; | |
fd38203a LP |
1569 | |
1570 | if (s->pending) | |
c2ba3ad6 | 1571 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1572 | |
1573 | if (s->prepare) | |
c2ba3ad6 | 1574 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1575 | |
6203e07a LP |
1576 | if (s->type == SOURCE_EXIT) |
1577 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1578 | |
fd38203a LP |
1579 | return 0; |
1580 | } | |
1581 | ||
f7262a9f | 1582 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1583 | assert_return(s, -EINVAL); |
1584 | assert_return(m, -EINVAL); | |
1585 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1586 | |
baf76283 | 1587 | *m = s->enabled; |
fd38203a LP |
1588 | return 0; |
1589 | } | |
1590 | ||
f7262a9f | 1591 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1592 | int r; |
1593 | ||
305f78bf LP |
1594 | assert_return(s, -EINVAL); |
1595 | assert_return(m == SD_EVENT_OFF || m == SD_EVENT_ON || m == SD_EVENT_ONESHOT, -EINVAL); | |
305f78bf | 1596 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1597 | |
cc567911 LP |
1598 | /* If we are dead anyway, we are fine with turning off |
1599 | * sources, but everything else needs to fail. */ | |
1600 | if (s->event->state == SD_EVENT_FINISHED) | |
1601 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1602 | ||
baf76283 | 1603 | if (s->enabled == m) |
fd38203a LP |
1604 | return 0; |
1605 | ||
baf76283 | 1606 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1607 | |
1608 | switch (s->type) { | |
1609 | ||
1610 | case SOURCE_IO: | |
366e6411 | 1611 | source_io_unregister(s); |
baf76283 | 1612 | s->enabled = m; |
fd38203a LP |
1613 | break; |
1614 | ||
6a0f1f6d | 1615 | case SOURCE_TIME_REALTIME: |
a8548816 | 1616 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1617 | case SOURCE_TIME_MONOTONIC: |
1618 | case SOURCE_TIME_REALTIME_ALARM: | |
1619 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1620 | struct clock_data *d; | |
fd38203a | 1621 | |
baf76283 | 1622 | s->enabled = m; |
6a0f1f6d LP |
1623 | d = event_get_clock_data(s->event, s->type); |
1624 | assert(d); | |
1625 | ||
1626 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1627 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1628 | d->needs_rearm = true; |
fd38203a | 1629 | break; |
6a0f1f6d | 1630 | } |
fd38203a LP |
1631 | |
1632 | case SOURCE_SIGNAL: | |
baf76283 | 1633 | s->enabled = m; |
4807d2d0 | 1634 | |
9da4cb2b | 1635 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
fd38203a LP |
1636 | break; |
1637 | ||
1638 | case SOURCE_CHILD: | |
baf76283 | 1639 | s->enabled = m; |
fd38203a | 1640 | |
baf76283 LP |
1641 | assert(s->event->n_enabled_child_sources > 0); |
1642 | s->event->n_enabled_child_sources--; | |
fd38203a | 1643 | |
9da4cb2b | 1644 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
fd38203a LP |
1645 | break; |
1646 | ||
6203e07a | 1647 | case SOURCE_EXIT: |
305f78bf | 1648 | s->enabled = m; |
6203e07a | 1649 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1650 | break; |
1651 | ||
1652 | case SOURCE_DEFER: | |
6e9feda3 | 1653 | case SOURCE_POST: |
baf76283 | 1654 | s->enabled = m; |
fd38203a | 1655 | break; |
9d3e3aa5 | 1656 | |
6a0f1f6d | 1657 | default: |
9d3e3aa5 | 1658 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1659 | } |
1660 | ||
1661 | } else { | |
1662 | switch (s->type) { | |
1663 | ||
1664 | case SOURCE_IO: | |
1665 | r = source_io_register(s, m, s->io.events); | |
1666 | if (r < 0) | |
1667 | return r; | |
1668 | ||
baf76283 | 1669 | s->enabled = m; |
fd38203a LP |
1670 | break; |
1671 | ||
6a0f1f6d | 1672 | case SOURCE_TIME_REALTIME: |
a8548816 | 1673 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1674 | case SOURCE_TIME_MONOTONIC: |
1675 | case SOURCE_TIME_REALTIME_ALARM: | |
1676 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1677 | struct clock_data *d; | |
fd38203a | 1678 | |
baf76283 | 1679 | s->enabled = m; |
6a0f1f6d LP |
1680 | d = event_get_clock_data(s->event, s->type); |
1681 | assert(d); | |
1682 | ||
1683 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1684 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1685 | d->needs_rearm = true; |
fd38203a | 1686 | break; |
6a0f1f6d | 1687 | } |
fd38203a LP |
1688 | |
1689 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1690 | |
1691 | s->enabled = m; | |
9da4cb2b LP |
1692 | |
1693 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
1694 | if (r < 0) { | |
1695 | s->enabled = SD_EVENT_OFF; | |
1696 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
1697 | return r; | |
1698 | } | |
1699 | ||
fd38203a LP |
1700 | break; |
1701 | ||
1702 | case SOURCE_CHILD: | |
4807d2d0 | 1703 | |
9da4cb2b | 1704 | if (s->enabled == SD_EVENT_OFF) |
4807d2d0 | 1705 | s->event->n_enabled_child_sources++; |
7a0d4a3d DH |
1706 | |
1707 | s->enabled = m; | |
9da4cb2b | 1708 | |
10edebf6 | 1709 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
9da4cb2b LP |
1710 | if (r < 0) { |
1711 | s->enabled = SD_EVENT_OFF; | |
1712 | s->event->n_enabled_child_sources--; | |
1713 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
1714 | return r; | |
1715 | } | |
1716 | ||
fd38203a LP |
1717 | break; |
1718 | ||
6203e07a | 1719 | case SOURCE_EXIT: |
305f78bf | 1720 | s->enabled = m; |
6203e07a | 1721 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1722 | break; |
1723 | ||
1724 | case SOURCE_DEFER: | |
6e9feda3 | 1725 | case SOURCE_POST: |
baf76283 | 1726 | s->enabled = m; |
fd38203a | 1727 | break; |
9d3e3aa5 | 1728 | |
6a0f1f6d | 1729 | default: |
9d3e3aa5 | 1730 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1731 | } |
1732 | } | |
1733 | ||
1734 | if (s->pending) | |
1735 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1736 | ||
1737 | if (s->prepare) | |
1738 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1739 | ||
1740 | return 0; | |
1741 | } | |
1742 | ||
f7262a9f | 1743 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1744 | assert_return(s, -EINVAL); |
1745 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1746 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1747 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1748 | |
1749 | *usec = s->time.next; | |
1750 | return 0; | |
1751 | } | |
1752 | ||
f7262a9f | 1753 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1754 | struct clock_data *d; |
1755 | ||
305f78bf LP |
1756 | assert_return(s, -EINVAL); |
1757 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1758 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1759 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1760 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1761 | |
fd38203a | 1762 | s->time.next = usec; |
2576a19e | 1763 | |
0cc1125a | 1764 | source_set_pending(s, false); |
fd38203a | 1765 | |
6a0f1f6d LP |
1766 | d = event_get_clock_data(s->event, s->type); |
1767 | assert(d); | |
1768 | ||
1769 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1770 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1771 | d->needs_rearm = true; |
fd38203a LP |
1772 | |
1773 | return 0; | |
1774 | } | |
1775 | ||
f7262a9f | 1776 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1777 | assert_return(s, -EINVAL); |
1778 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1779 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1780 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1781 | ||
1782 | *usec = s->time.accuracy; | |
1783 | return 0; | |
1784 | } | |
1785 | ||
f7262a9f | 1786 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1787 | struct clock_data *d; |
1788 | ||
305f78bf LP |
1789 | assert_return(s, -EINVAL); |
1790 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1791 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1792 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1793 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1794 | |
1795 | if (usec == 0) | |
1796 | usec = DEFAULT_ACCURACY_USEC; | |
1797 | ||
eaa3cbef LP |
1798 | s->time.accuracy = usec; |
1799 | ||
2576a19e LP |
1800 | source_set_pending(s, false); |
1801 | ||
6a0f1f6d LP |
1802 | d = event_get_clock_data(s->event, s->type); |
1803 | assert(d); | |
1804 | ||
1805 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1806 | d->needs_rearm = true; |
6a0f1f6d LP |
1807 | |
1808 | return 0; | |
1809 | } | |
1810 | ||
1811 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1812 | assert_return(s, -EINVAL); | |
1813 | assert_return(clock, -EINVAL); | |
1814 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1815 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1816 | |
6a0f1f6d | 1817 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1818 | return 0; |
1819 | } | |
1820 | ||
f7262a9f | 1821 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1822 | assert_return(s, -EINVAL); |
1823 | assert_return(pid, -EINVAL); | |
1824 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1825 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1826 | ||
1827 | *pid = s->child.pid; | |
1828 | return 0; | |
1829 | } | |
1830 | ||
718db961 | 1831 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1832 | int r; |
1833 | ||
da7e457c | 1834 | assert_return(s, -EINVAL); |
6203e07a | 1835 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1836 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1837 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1838 | |
1839 | if (s->prepare == callback) | |
1840 | return 0; | |
1841 | ||
1842 | if (callback && s->prepare) { | |
1843 | s->prepare = callback; | |
1844 | return 0; | |
1845 | } | |
1846 | ||
1847 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1848 | if (r < 0) | |
1849 | return r; | |
1850 | ||
1851 | s->prepare = callback; | |
1852 | ||
1853 | if (callback) { | |
1854 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1855 | if (r < 0) | |
1856 | return r; | |
1857 | } else | |
1858 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1859 | ||
1860 | return 0; | |
1861 | } | |
1862 | ||
f7262a9f | 1863 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1864 | assert_return(s, NULL); |
fd38203a LP |
1865 | |
1866 | return s->userdata; | |
1867 | } | |
1868 | ||
8f726607 LP |
1869 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1870 | void *ret; | |
1871 | ||
1872 | assert_return(s, NULL); | |
1873 | ||
1874 | ret = s->userdata; | |
1875 | s->userdata = userdata; | |
1876 | ||
1877 | return ret; | |
1878 | } | |
1879 | ||
c2ba3ad6 LP |
1880 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1881 | usec_t c; | |
1882 | assert(e); | |
1883 | assert(a <= b); | |
1884 | ||
1885 | if (a <= 0) | |
1886 | return 0; | |
1887 | ||
1888 | if (b <= a + 1) | |
1889 | return a; | |
1890 | ||
52444dc4 LP |
1891 | initialize_perturb(e); |
1892 | ||
c2ba3ad6 LP |
1893 | /* |
1894 | Find a good time to wake up again between times a and b. We | |
1895 | have two goals here: | |
1896 | ||
1897 | a) We want to wake up as seldom as possible, hence prefer | |
1898 | later times over earlier times. | |
1899 | ||
1900 | b) But if we have to wake up, then let's make sure to | |
1901 | dispatch as much as possible on the entire system. | |
1902 | ||
1903 | We implement this by waking up everywhere at the same time | |
850516e0 | 1904 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1905 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1906 | then we try to find the same spot in every 10s, then 1s and |
1907 | then 250ms step. Otherwise, we pick the last possible time | |
1908 | to wake up. | |
c2ba3ad6 LP |
1909 | */ |
1910 | ||
850516e0 LP |
1911 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1912 | if (c >= b) { | |
1913 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1914 | return b; | |
1915 | ||
1916 | c -= USEC_PER_MINUTE; | |
1917 | } | |
1918 | ||
ba276c81 LP |
1919 | if (c >= a) |
1920 | return c; | |
1921 | ||
1922 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1923 | if (c >= b) { | |
1924 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1925 | return b; | |
1926 | ||
1927 | c -= USEC_PER_SEC*10; | |
1928 | } | |
1929 | ||
850516e0 LP |
1930 | if (c >= a) |
1931 | return c; | |
1932 | ||
1933 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1934 | if (c >= b) { |
1935 | if (_unlikely_(c < USEC_PER_SEC)) | |
1936 | return b; | |
1937 | ||
1938 | c -= USEC_PER_SEC; | |
1939 | } | |
1940 | ||
1941 | if (c >= a) | |
1942 | return c; | |
1943 | ||
1944 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1945 | if (c >= b) { | |
1946 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1947 | return b; | |
1948 | ||
1949 | c -= USEC_PER_MSEC*250; | |
1950 | } | |
1951 | ||
1952 | if (c >= a) | |
1953 | return c; | |
1954 | ||
1955 | return b; | |
1956 | } | |
1957 | ||
fd38203a LP |
1958 | static int event_arm_timer( |
1959 | sd_event *e, | |
6a0f1f6d | 1960 | struct clock_data *d) { |
fd38203a LP |
1961 | |
1962 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1963 | sd_event_source *a, *b; |
1964 | usec_t t; | |
fd38203a LP |
1965 | int r; |
1966 | ||
cde93897 | 1967 | assert(e); |
6a0f1f6d | 1968 | assert(d); |
fd38203a | 1969 | |
d06441da | 1970 | if (!d->needs_rearm) |
212bbb17 TG |
1971 | return 0; |
1972 | else | |
1973 | d->needs_rearm = false; | |
1974 | ||
6a0f1f6d | 1975 | a = prioq_peek(d->earliest); |
72aedc1e LP |
1976 | if (!a || a->enabled == SD_EVENT_OFF) { |
1977 | ||
6a0f1f6d | 1978 | if (d->fd < 0) |
c57b5ca3 LP |
1979 | return 0; |
1980 | ||
3a43da28 | 1981 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
1982 | return 0; |
1983 | ||
1984 | /* disarm */ | |
6a0f1f6d | 1985 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
1986 | if (r < 0) |
1987 | return r; | |
1988 | ||
3a43da28 | 1989 | d->next = USEC_INFINITY; |
fd38203a | 1990 | return 0; |
72aedc1e | 1991 | } |
fd38203a | 1992 | |
6a0f1f6d | 1993 | b = prioq_peek(d->latest); |
baf76283 | 1994 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 LP |
1995 | |
1996 | t = sleep_between(e, a->time.next, b->time.next + b->time.accuracy); | |
6a0f1f6d | 1997 | if (d->next == t) |
fd38203a LP |
1998 | return 0; |
1999 | ||
6a0f1f6d | 2000 | assert_se(d->fd >= 0); |
fd38203a | 2001 | |
c2ba3ad6 | 2002 | if (t == 0) { |
fd38203a LP |
2003 | /* We don' want to disarm here, just mean some time looooong ago. */ |
2004 | its.it_value.tv_sec = 0; | |
2005 | its.it_value.tv_nsec = 1; | |
2006 | } else | |
c2ba3ad6 | 2007 | timespec_store(&its.it_value, t); |
fd38203a | 2008 | |
6a0f1f6d | 2009 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 2010 | if (r < 0) |
cde93897 | 2011 | return -errno; |
fd38203a | 2012 | |
6a0f1f6d | 2013 | d->next = t; |
fd38203a LP |
2014 | return 0; |
2015 | } | |
2016 | ||
9a800b56 | 2017 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
2018 | assert(e); |
2019 | assert(s); | |
2020 | assert(s->type == SOURCE_IO); | |
2021 | ||
9a800b56 LP |
2022 | /* If the event source was already pending, we just OR in the |
2023 | * new revents, otherwise we reset the value. The ORing is | |
2024 | * necessary to handle EPOLLONESHOT events properly where | |
2025 | * readability might happen independently of writability, and | |
2026 | * we need to keep track of both */ | |
2027 | ||
2028 | if (s->pending) | |
2029 | s->io.revents |= revents; | |
2030 | else | |
2031 | s->io.revents = revents; | |
fd38203a | 2032 | |
fd38203a LP |
2033 | return source_set_pending(s, true); |
2034 | } | |
2035 | ||
72aedc1e | 2036 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2037 | uint64_t x; |
2038 | ssize_t ss; | |
2039 | ||
2040 | assert(e); | |
da7e457c | 2041 | assert(fd >= 0); |
72aedc1e | 2042 | |
305f78bf | 2043 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2044 | |
2045 | ss = read(fd, &x, sizeof(x)); | |
2046 | if (ss < 0) { | |
2047 | if (errno == EAGAIN || errno == EINTR) | |
2048 | return 0; | |
2049 | ||
2050 | return -errno; | |
2051 | } | |
2052 | ||
8d35dae7 | 2053 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2054 | return -EIO; |
2055 | ||
cde93897 | 2056 | if (next) |
3a43da28 | 2057 | *next = USEC_INFINITY; |
72aedc1e | 2058 | |
fd38203a LP |
2059 | return 0; |
2060 | } | |
2061 | ||
305f78bf LP |
2062 | static int process_timer( |
2063 | sd_event *e, | |
2064 | usec_t n, | |
6a0f1f6d | 2065 | struct clock_data *d) { |
305f78bf | 2066 | |
fd38203a LP |
2067 | sd_event_source *s; |
2068 | int r; | |
2069 | ||
2070 | assert(e); | |
6a0f1f6d | 2071 | assert(d); |
fd38203a LP |
2072 | |
2073 | for (;;) { | |
6a0f1f6d | 2074 | s = prioq_peek(d->earliest); |
fd38203a LP |
2075 | if (!s || |
2076 | s->time.next > n || | |
baf76283 | 2077 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2078 | s->pending) |
2079 | break; | |
2080 | ||
2081 | r = source_set_pending(s, true); | |
2082 | if (r < 0) | |
2083 | return r; | |
2084 | ||
6a0f1f6d LP |
2085 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2086 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 2087 | d->needs_rearm = true; |
fd38203a LP |
2088 | } |
2089 | ||
2090 | return 0; | |
2091 | } | |
2092 | ||
2093 | static int process_child(sd_event *e) { | |
2094 | sd_event_source *s; | |
2095 | Iterator i; | |
2096 | int r; | |
2097 | ||
2098 | assert(e); | |
2099 | ||
c2ba3ad6 LP |
2100 | e->need_process_child = false; |
2101 | ||
fd38203a LP |
2102 | /* |
2103 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2104 | + WNOHANG for each PID we wait for, instead of using | |
2105 | P_ALL. This is because we only want to get child | |
2106 | information of very specific child processes, and not all | |
2107 | of them. We might not have processed the SIGCHLD even of a | |
2108 | previous invocation and we don't want to maintain a | |
2109 | unbounded *per-child* event queue, hence we really don't | |
2110 | want anything flushed out of the kernel's queue that we | |
2111 | don't care about. Since this is O(n) this means that if you | |
2112 | have a lot of processes you probably want to handle SIGCHLD | |
2113 | yourself. | |
08cd1552 LP |
2114 | |
2115 | We do not reap the children here (by using WNOWAIT), this | |
2116 | is only done after the event source is dispatched so that | |
2117 | the callback still sees the process as a zombie. | |
fd38203a LP |
2118 | */ |
2119 | ||
2120 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2121 | assert(s->type == SOURCE_CHILD); | |
2122 | ||
2123 | if (s->pending) | |
2124 | continue; | |
2125 | ||
baf76283 | 2126 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2127 | continue; |
2128 | ||
2129 | zero(s->child.siginfo); | |
08cd1552 LP |
2130 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2131 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
2132 | if (r < 0) |
2133 | return -errno; | |
2134 | ||
2135 | if (s->child.siginfo.si_pid != 0) { | |
08cd1552 LP |
2136 | bool zombie = |
2137 | s->child.siginfo.si_code == CLD_EXITED || | |
2138 | s->child.siginfo.si_code == CLD_KILLED || | |
2139 | s->child.siginfo.si_code == CLD_DUMPED; | |
2140 | ||
2141 | if (!zombie && (s->child.options & WEXITED)) { | |
2142 | /* If the child isn't dead then let's | |
2143 | * immediately remove the state change | |
2144 | * from the queue, since there's no | |
2145 | * benefit in leaving it queued */ | |
2146 | ||
2147 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2148 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2149 | } | |
2150 | ||
fd38203a LP |
2151 | r = source_set_pending(s, true); |
2152 | if (r < 0) | |
2153 | return r; | |
2154 | } | |
2155 | } | |
2156 | ||
fd38203a LP |
2157 | return 0; |
2158 | } | |
2159 | ||
9da4cb2b | 2160 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2161 | bool read_one = false; |
fd38203a LP |
2162 | int r; |
2163 | ||
da7e457c | 2164 | assert(e); |
305f78bf | 2165 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2166 | |
9da4cb2b LP |
2167 | /* If there's a signal queued on this priority and SIGCHLD is |
2168 | on this priority too, then make sure to recheck the | |
2169 | children we watch. This is because we only ever dequeue | |
2170 | the first signal per priority, and if we dequeue one, and | |
2171 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2172 | might have higher priority children we care about hence we | |
2173 | need to check that explicitly. */ | |
2174 | ||
2175 | if (sigismember(&d->sigset, SIGCHLD)) | |
2176 | e->need_process_child = true; | |
2177 | ||
2178 | /* If there's already an event source pending for this | |
2179 | * priority we don't read another */ | |
2180 | if (d->current) | |
2181 | return 0; | |
2182 | ||
fd38203a | 2183 | for (;;) { |
0eb2e0e3 | 2184 | struct signalfd_siginfo si; |
7057bd99 | 2185 | ssize_t n; |
92daebc0 | 2186 | sd_event_source *s = NULL; |
fd38203a | 2187 | |
9da4cb2b | 2188 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 2189 | if (n < 0) { |
fd38203a LP |
2190 | if (errno == EAGAIN || errno == EINTR) |
2191 | return read_one; | |
2192 | ||
2193 | return -errno; | |
2194 | } | |
2195 | ||
7057bd99 | 2196 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2197 | return -EIO; |
2198 | ||
7057bd99 ZJS |
2199 | assert(si.ssi_signo < _NSIG); |
2200 | ||
fd38203a LP |
2201 | read_one = true; |
2202 | ||
92daebc0 LP |
2203 | if (e->signal_sources) |
2204 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
2205 | if (!s) |
2206 | continue; | |
9da4cb2b LP |
2207 | if (s->pending) |
2208 | continue; | |
fd38203a LP |
2209 | |
2210 | s->signal.siginfo = si; | |
9da4cb2b LP |
2211 | d->current = s; |
2212 | ||
fd38203a LP |
2213 | r = source_set_pending(s, true); |
2214 | if (r < 0) | |
2215 | return r; | |
9da4cb2b LP |
2216 | |
2217 | return 1; | |
fd38203a | 2218 | } |
fd38203a LP |
2219 | } |
2220 | ||
2221 | static int source_dispatch(sd_event_source *s) { | |
fe8245eb | 2222 | int r = 0; |
fd38203a LP |
2223 | |
2224 | assert(s); | |
6203e07a | 2225 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2226 | |
6203e07a | 2227 | if (s->type != SOURCE_DEFER && s->type != SOURCE_EXIT) { |
da7e457c LP |
2228 | r = source_set_pending(s, false); |
2229 | if (r < 0) | |
2230 | return r; | |
2231 | } | |
fd38203a | 2232 | |
6e9feda3 LP |
2233 | if (s->type != SOURCE_POST) { |
2234 | sd_event_source *z; | |
2235 | Iterator i; | |
2236 | ||
2237 | /* If we execute a non-post source, let's mark all | |
2238 | * post sources as pending */ | |
2239 | ||
2240 | SET_FOREACH(z, s->event->post_sources, i) { | |
2241 | if (z->enabled == SD_EVENT_OFF) | |
2242 | continue; | |
2243 | ||
2244 | r = source_set_pending(z, true); | |
2245 | if (r < 0) | |
2246 | return r; | |
2247 | } | |
2248 | } | |
2249 | ||
baf76283 LP |
2250 | if (s->enabled == SD_EVENT_ONESHOT) { |
2251 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2252 | if (r < 0) |
2253 | return r; | |
2254 | } | |
2255 | ||
12179984 | 2256 | s->dispatching = true; |
b7484e2a | 2257 | |
fd38203a LP |
2258 | switch (s->type) { |
2259 | ||
2260 | case SOURCE_IO: | |
2261 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2262 | break; | |
2263 | ||
6a0f1f6d | 2264 | case SOURCE_TIME_REALTIME: |
a8548816 | 2265 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2266 | case SOURCE_TIME_MONOTONIC: |
2267 | case SOURCE_TIME_REALTIME_ALARM: | |
2268 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2269 | r = s->time.callback(s, s->time.next, s->userdata); |
2270 | break; | |
2271 | ||
2272 | case SOURCE_SIGNAL: | |
2273 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2274 | break; | |
2275 | ||
08cd1552 LP |
2276 | case SOURCE_CHILD: { |
2277 | bool zombie; | |
2278 | ||
2279 | zombie = s->child.siginfo.si_code == CLD_EXITED || | |
2280 | s->child.siginfo.si_code == CLD_KILLED || | |
2281 | s->child.siginfo.si_code == CLD_DUMPED; | |
2282 | ||
fd38203a | 2283 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2284 | |
2285 | /* Now, reap the PID for good. */ | |
2286 | if (zombie) | |
2287 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2288 | ||
fd38203a | 2289 | break; |
08cd1552 | 2290 | } |
fd38203a LP |
2291 | |
2292 | case SOURCE_DEFER: | |
2293 | r = s->defer.callback(s, s->userdata); | |
2294 | break; | |
da7e457c | 2295 | |
6e9feda3 LP |
2296 | case SOURCE_POST: |
2297 | r = s->post.callback(s, s->userdata); | |
2298 | break; | |
2299 | ||
6203e07a LP |
2300 | case SOURCE_EXIT: |
2301 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2302 | break; |
9d3e3aa5 LP |
2303 | |
2304 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2305 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2306 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2307 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2308 | } |
2309 | ||
12179984 LP |
2310 | s->dispatching = false; |
2311 | ||
55cbfaa5 DM |
2312 | if (r < 0) |
2313 | log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m", | |
2314 | strna(s->description), event_source_type_to_string(s->type)); | |
12179984 LP |
2315 | |
2316 | if (s->n_ref == 0) | |
2317 | source_free(s); | |
2318 | else if (r < 0) | |
6203e07a | 2319 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2320 | |
6203e07a | 2321 | return 1; |
fd38203a LP |
2322 | } |
2323 | ||
2324 | static int event_prepare(sd_event *e) { | |
2325 | int r; | |
2326 | ||
2327 | assert(e); | |
2328 | ||
2329 | for (;;) { | |
2330 | sd_event_source *s; | |
2331 | ||
2332 | s = prioq_peek(e->prepare); | |
baf76283 | 2333 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2334 | break; |
2335 | ||
2336 | s->prepare_iteration = e->iteration; | |
2337 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2338 | if (r < 0) | |
2339 | return r; | |
2340 | ||
2341 | assert(s->prepare); | |
12179984 LP |
2342 | |
2343 | s->dispatching = true; | |
fd38203a | 2344 | r = s->prepare(s, s->userdata); |
12179984 LP |
2345 | s->dispatching = false; |
2346 | ||
55cbfaa5 DM |
2347 | if (r < 0) |
2348 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m", | |
2349 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a | 2350 | |
12179984 LP |
2351 | if (s->n_ref == 0) |
2352 | source_free(s); | |
2353 | else if (r < 0) | |
2354 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2355 | } |
2356 | ||
2357 | return 0; | |
2358 | } | |
2359 | ||
6203e07a | 2360 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2361 | sd_event_source *p; |
2362 | int r; | |
2363 | ||
2364 | assert(e); | |
2365 | ||
6203e07a | 2366 | p = prioq_peek(e->exit); |
baf76283 | 2367 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2368 | e->state = SD_EVENT_FINISHED; |
2369 | return 0; | |
2370 | } | |
2371 | ||
2372 | sd_event_ref(e); | |
2373 | e->iteration++; | |
6203e07a | 2374 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2375 | |
2376 | r = source_dispatch(p); | |
2377 | ||
2b0c9ef7 | 2378 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2379 | sd_event_unref(e); |
2380 | ||
2381 | return r; | |
2382 | } | |
2383 | ||
c2ba3ad6 LP |
2384 | static sd_event_source* event_next_pending(sd_event *e) { |
2385 | sd_event_source *p; | |
2386 | ||
da7e457c LP |
2387 | assert(e); |
2388 | ||
c2ba3ad6 LP |
2389 | p = prioq_peek(e->pending); |
2390 | if (!p) | |
2391 | return NULL; | |
2392 | ||
baf76283 | 2393 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2394 | return NULL; |
2395 | ||
2396 | return p; | |
2397 | } | |
2398 | ||
cde93897 LP |
2399 | static int arm_watchdog(sd_event *e) { |
2400 | struct itimerspec its = {}; | |
2401 | usec_t t; | |
2402 | int r; | |
2403 | ||
2404 | assert(e); | |
2405 | assert(e->watchdog_fd >= 0); | |
2406 | ||
2407 | t = sleep_between(e, | |
2408 | e->watchdog_last + (e->watchdog_period / 2), | |
2409 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2410 | ||
2411 | timespec_store(&its.it_value, t); | |
2412 | ||
75145780 LP |
2413 | /* Make sure we never set the watchdog to 0, which tells the |
2414 | * kernel to disable it. */ | |
2415 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2416 | its.it_value.tv_nsec = 1; | |
2417 | ||
cde93897 LP |
2418 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2419 | if (r < 0) | |
2420 | return -errno; | |
2421 | ||
2422 | return 0; | |
2423 | } | |
2424 | ||
2425 | static int process_watchdog(sd_event *e) { | |
2426 | assert(e); | |
2427 | ||
2428 | if (!e->watchdog) | |
2429 | return 0; | |
2430 | ||
2431 | /* Don't notify watchdog too often */ | |
2432 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2433 | return 0; | |
2434 | ||
2435 | sd_notify(false, "WATCHDOG=1"); | |
2436 | e->watchdog_last = e->timestamp.monotonic; | |
2437 | ||
2438 | return arm_watchdog(e); | |
2439 | } | |
2440 | ||
c45a5a74 TG |
2441 | _public_ int sd_event_prepare(sd_event *e) { |
2442 | int r; | |
fd38203a | 2443 | |
da7e457c LP |
2444 | assert_return(e, -EINVAL); |
2445 | assert_return(!event_pid_changed(e), -ECHILD); | |
2446 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2447 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 2448 | |
6203e07a | 2449 | if (e->exit_requested) |
c45a5a74 | 2450 | goto pending; |
fd38203a LP |
2451 | |
2452 | e->iteration++; | |
2453 | ||
0be6c2f6 | 2454 | e->state = SD_EVENT_PREPARING; |
fd38203a | 2455 | r = event_prepare(e); |
0be6c2f6 | 2456 | e->state = SD_EVENT_INITIAL; |
fd38203a | 2457 | if (r < 0) |
c45a5a74 | 2458 | return r; |
fd38203a | 2459 | |
6a0f1f6d LP |
2460 | r = event_arm_timer(e, &e->realtime); |
2461 | if (r < 0) | |
c45a5a74 | 2462 | return r; |
6a0f1f6d | 2463 | |
a8548816 TG |
2464 | r = event_arm_timer(e, &e->boottime); |
2465 | if (r < 0) | |
c45a5a74 | 2466 | return r; |
a8548816 | 2467 | |
6a0f1f6d LP |
2468 | r = event_arm_timer(e, &e->monotonic); |
2469 | if (r < 0) | |
c45a5a74 | 2470 | return r; |
6a0f1f6d LP |
2471 | |
2472 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 2473 | if (r < 0) |
c45a5a74 | 2474 | return r; |
fd38203a | 2475 | |
6a0f1f6d | 2476 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 2477 | if (r < 0) |
c45a5a74 | 2478 | return r; |
fd38203a | 2479 | |
1b5995b0 | 2480 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
2481 | goto pending; |
2482 | ||
2b0c9ef7 | 2483 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
2484 | |
2485 | return 0; | |
2486 | ||
2487 | pending: | |
2b0c9ef7 | 2488 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2489 | r = sd_event_wait(e, 0); |
2490 | if (r == 0) | |
2b0c9ef7 | 2491 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2492 | |
2493 | return r; | |
c45a5a74 TG |
2494 | } |
2495 | ||
2496 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2497 | struct epoll_event *ev_queue; | |
2498 | unsigned ev_queue_max; | |
2499 | int r, m, i; | |
2500 | ||
2501 | assert_return(e, -EINVAL); | |
2502 | assert_return(!event_pid_changed(e), -ECHILD); | |
2503 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2504 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
2505 | |
2506 | if (e->exit_requested) { | |
2507 | e->state = SD_EVENT_PENDING; | |
2508 | return 1; | |
2509 | } | |
6a0f1f6d | 2510 | |
1c724e9e | 2511 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 2512 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 2513 | |
15b38f93 | 2514 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2515 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2516 | if (m < 0) { |
c45a5a74 TG |
2517 | if (errno == EINTR) { |
2518 | e->state = SD_EVENT_PENDING; | |
2519 | return 1; | |
2520 | } | |
2521 | ||
2522 | r = -errno; | |
da7e457c LP |
2523 | goto finish; |
2524 | } | |
fd38203a | 2525 | |
46e8c825 | 2526 | dual_timestamp_get(&e->timestamp); |
6a0f1f6d | 2527 | e->timestamp_boottime = now(CLOCK_BOOTTIME); |
fd38203a LP |
2528 | |
2529 | for (i = 0; i < m; i++) { | |
2530 | ||
9da4cb2b | 2531 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2532 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
9da4cb2b LP |
2533 | else { |
2534 | WakeupType *t = ev_queue[i].data.ptr; | |
2535 | ||
2536 | switch (*t) { | |
2537 | ||
2538 | case WAKEUP_EVENT_SOURCE: | |
2539 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2540 | break; | |
fd38203a | 2541 | |
9da4cb2b LP |
2542 | case WAKEUP_CLOCK_DATA: { |
2543 | struct clock_data *d = ev_queue[i].data.ptr; | |
2544 | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); | |
2545 | break; | |
2546 | } | |
2547 | ||
2548 | case WAKEUP_SIGNAL_DATA: | |
2549 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2550 | break; | |
2551 | ||
2552 | default: | |
2553 | assert_not_reached("Invalid wake-up pointer"); | |
2554 | } | |
2555 | } | |
fd38203a | 2556 | if (r < 0) |
da7e457c | 2557 | goto finish; |
fd38203a LP |
2558 | } |
2559 | ||
cde93897 LP |
2560 | r = process_watchdog(e); |
2561 | if (r < 0) | |
2562 | goto finish; | |
2563 | ||
6a0f1f6d LP |
2564 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2565 | if (r < 0) | |
2566 | goto finish; | |
2567 | ||
a8548816 TG |
2568 | r = process_timer(e, e->timestamp_boottime, &e->boottime); |
2569 | if (r < 0) | |
2570 | goto finish; | |
2571 | ||
6a0f1f6d LP |
2572 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2573 | if (r < 0) | |
2574 | goto finish; | |
2575 | ||
2576 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2577 | if (r < 0) |
da7e457c | 2578 | goto finish; |
fd38203a | 2579 | |
6a0f1f6d | 2580 | r = process_timer(e, e->timestamp_boottime, &e->boottime_alarm); |
fd38203a | 2581 | if (r < 0) |
da7e457c | 2582 | goto finish; |
fd38203a | 2583 | |
c2ba3ad6 | 2584 | if (e->need_process_child) { |
fd38203a LP |
2585 | r = process_child(e); |
2586 | if (r < 0) | |
da7e457c | 2587 | goto finish; |
fd38203a LP |
2588 | } |
2589 | ||
c45a5a74 TG |
2590 | if (event_next_pending(e)) { |
2591 | e->state = SD_EVENT_PENDING; | |
2592 | ||
2593 | return 1; | |
da7e457c LP |
2594 | } |
2595 | ||
c45a5a74 | 2596 | r = 0; |
fd38203a | 2597 | |
da7e457c | 2598 | finish: |
2b0c9ef7 | 2599 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2600 | |
2601 | return r; | |
fd38203a LP |
2602 | } |
2603 | ||
c45a5a74 TG |
2604 | _public_ int sd_event_dispatch(sd_event *e) { |
2605 | sd_event_source *p; | |
2606 | int r; | |
2607 | ||
2608 | assert_return(e, -EINVAL); | |
2609 | assert_return(!event_pid_changed(e), -ECHILD); | |
2610 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2611 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
2612 | ||
2613 | if (e->exit_requested) | |
2614 | return dispatch_exit(e); | |
2615 | ||
2616 | p = event_next_pending(e); | |
2617 | if (p) { | |
2618 | sd_event_ref(e); | |
2619 | ||
2620 | e->state = SD_EVENT_RUNNING; | |
2621 | r = source_dispatch(p); | |
2b0c9ef7 | 2622 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2623 | |
2624 | sd_event_unref(e); | |
2625 | ||
2626 | return r; | |
2627 | } | |
2628 | ||
2b0c9ef7 | 2629 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2630 | |
2631 | return 1; | |
2632 | } | |
2633 | ||
34b87517 VC |
2634 | static void event_log_delays(sd_event *e) { |
2635 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1]; | |
34a6843d VC |
2636 | unsigned i; |
2637 | int o; | |
34b87517 VC |
2638 | |
2639 | for (i = o = 0; i < ELEMENTSOF(e->delays); i++) { | |
2640 | o += snprintf(&b[o], sizeof(b) - o, "%u ", e->delays[i]); | |
2641 | e->delays[i] = 0; | |
2642 | } | |
34a6843d | 2643 | log_debug("Event loop iterations: %.*s", o, b); |
34b87517 VC |
2644 | } |
2645 | ||
c45a5a74 TG |
2646 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
2647 | int r; | |
2648 | ||
2649 | assert_return(e, -EINVAL); | |
2650 | assert_return(!event_pid_changed(e), -ECHILD); | |
2651 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2652 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 | 2653 | |
34b87517 VC |
2654 | if (e->profile_delays && e->last_run) { |
2655 | usec_t this_run; | |
2656 | unsigned l; | |
2657 | ||
2658 | this_run = now(CLOCK_MONOTONIC); | |
2659 | ||
2660 | l = u64log2(this_run - e->last_run); | |
2661 | assert(l < sizeof(e->delays)); | |
2662 | e->delays[l]++; | |
2663 | ||
2664 | if (this_run - e->last_log >= 5*USEC_PER_SEC) { | |
2665 | event_log_delays(e); | |
2666 | e->last_log = this_run; | |
2667 | } | |
2668 | } | |
2669 | ||
c45a5a74 | 2670 | r = sd_event_prepare(e); |
53bac4e0 LP |
2671 | if (r == 0) |
2672 | /* There was nothing? Then wait... */ | |
2673 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 2674 | |
34b87517 VC |
2675 | if (e->profile_delays) |
2676 | e->last_run = now(CLOCK_MONOTONIC); | |
2677 | ||
02d30981 | 2678 | if (r > 0) { |
53bac4e0 | 2679 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
2680 | r = sd_event_dispatch(e); |
2681 | if (r < 0) | |
2682 | return r; | |
53bac4e0 LP |
2683 | |
2684 | return 1; | |
2685 | } | |
2686 | ||
2687 | return r; | |
c45a5a74 TG |
2688 | } |
2689 | ||
f7262a9f | 2690 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2691 | int r; |
2692 | ||
da7e457c LP |
2693 | assert_return(e, -EINVAL); |
2694 | assert_return(!event_pid_changed(e), -ECHILD); | |
2b0c9ef7 | 2695 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c LP |
2696 | |
2697 | sd_event_ref(e); | |
fd38203a | 2698 | |
da7e457c | 2699 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2700 | r = sd_event_run(e, (uint64_t) -1); |
2701 | if (r < 0) | |
da7e457c | 2702 | goto finish; |
fd38203a LP |
2703 | } |
2704 | ||
6203e07a | 2705 | r = e->exit_code; |
da7e457c LP |
2706 | |
2707 | finish: | |
2708 | sd_event_unref(e); | |
2709 | return r; | |
fd38203a LP |
2710 | } |
2711 | ||
9b364545 TG |
2712 | _public_ int sd_event_get_fd(sd_event *e) { |
2713 | ||
2714 | assert_return(e, -EINVAL); | |
2715 | assert_return(!event_pid_changed(e), -ECHILD); | |
2716 | ||
2717 | return e->epoll_fd; | |
2718 | } | |
2719 | ||
f7262a9f | 2720 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c LP |
2721 | assert_return(e, -EINVAL); |
2722 | assert_return(!event_pid_changed(e), -ECHILD); | |
2723 | ||
2724 | return e->state; | |
2725 | } | |
2726 | ||
6203e07a | 2727 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2728 | assert_return(e, -EINVAL); |
6203e07a | 2729 | assert_return(code, -EINVAL); |
da7e457c | 2730 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2731 | |
6203e07a LP |
2732 | if (!e->exit_requested) |
2733 | return -ENODATA; | |
2734 | ||
2735 | *code = e->exit_code; | |
2736 | return 0; | |
fd38203a LP |
2737 | } |
2738 | ||
6203e07a | 2739 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c LP |
2740 | assert_return(e, -EINVAL); |
2741 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2742 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2743 | |
6203e07a LP |
2744 | e->exit_requested = true; |
2745 | e->exit_code = code; | |
2746 | ||
fd38203a LP |
2747 | return 0; |
2748 | } | |
46e8c825 | 2749 | |
6a0f1f6d | 2750 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 LP |
2751 | assert_return(e, -EINVAL); |
2752 | assert_return(usec, -EINVAL); | |
46e8c825 | 2753 | assert_return(!event_pid_changed(e), -ECHILD); |
2c86ba5a ZJS |
2754 | assert_return(IN_SET(clock, |
2755 | CLOCK_REALTIME, | |
2756 | CLOCK_REALTIME_ALARM, | |
2757 | CLOCK_MONOTONIC, | |
2758 | CLOCK_BOOTTIME, | |
2759 | CLOCK_BOOTTIME_ALARM), -EOPNOTSUPP); | |
46e8c825 | 2760 | |
38a03f06 LP |
2761 | if (!dual_timestamp_is_set(&e->timestamp)) { |
2762 | /* Implicitly fall back to now() if we never ran | |
2763 | * before and thus have no cached time. */ | |
2764 | *usec = now(clock); | |
2765 | return 1; | |
2766 | } | |
46e8c825 | 2767 | |
6a0f1f6d LP |
2768 | switch (clock) { |
2769 | ||
2770 | case CLOCK_REALTIME: | |
2771 | case CLOCK_REALTIME_ALARM: | |
2772 | *usec = e->timestamp.realtime; | |
2773 | break; | |
2774 | ||
2775 | case CLOCK_MONOTONIC: | |
2776 | *usec = e->timestamp.monotonic; | |
2777 | break; | |
2778 | ||
2c86ba5a | 2779 | default: |
6a0f1f6d LP |
2780 | *usec = e->timestamp_boottime; |
2781 | break; | |
2782 | } | |
46e8c825 | 2783 | |
46e8c825 LP |
2784 | return 0; |
2785 | } | |
afc6adb5 LP |
2786 | |
2787 | _public_ int sd_event_default(sd_event **ret) { | |
2788 | ||
ec202eae | 2789 | static thread_local sd_event *default_event = NULL; |
39883f62 | 2790 | sd_event *e = NULL; |
afc6adb5 LP |
2791 | int r; |
2792 | ||
2793 | if (!ret) | |
2794 | return !!default_event; | |
2795 | ||
2796 | if (default_event) { | |
2797 | *ret = sd_event_ref(default_event); | |
2798 | return 0; | |
2799 | } | |
2800 | ||
2801 | r = sd_event_new(&e); | |
2802 | if (r < 0) | |
2803 | return r; | |
2804 | ||
2805 | e->default_event_ptr = &default_event; | |
2806 | e->tid = gettid(); | |
2807 | default_event = e; | |
2808 | ||
2809 | *ret = e; | |
2810 | return 1; | |
2811 | } | |
2812 | ||
2813 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2814 | assert_return(e, -EINVAL); | |
2815 | assert_return(tid, -EINVAL); | |
76b54375 | 2816 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2817 | |
76b54375 LP |
2818 | if (e->tid != 0) { |
2819 | *tid = e->tid; | |
2820 | return 0; | |
2821 | } | |
2822 | ||
2823 | return -ENXIO; | |
afc6adb5 | 2824 | } |
cde93897 LP |
2825 | |
2826 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2827 | int r; | |
2828 | ||
2829 | assert_return(e, -EINVAL); | |
8f726607 | 2830 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2831 | |
2832 | if (e->watchdog == !!b) | |
2833 | return e->watchdog; | |
2834 | ||
2835 | if (b) { | |
2836 | struct epoll_event ev = {}; | |
cde93897 | 2837 | |
09812eb7 LP |
2838 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2839 | if (r <= 0) | |
cde93897 | 2840 | return r; |
cde93897 LP |
2841 | |
2842 | /* Issue first ping immediately */ | |
2843 | sd_notify(false, "WATCHDOG=1"); | |
2844 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2845 | ||
2846 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2847 | if (e->watchdog_fd < 0) | |
2848 | return -errno; | |
2849 | ||
2850 | r = arm_watchdog(e); | |
2851 | if (r < 0) | |
2852 | goto fail; | |
2853 | ||
2854 | ev.events = EPOLLIN; | |
2855 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2856 | ||
2857 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2858 | if (r < 0) { | |
2859 | r = -errno; | |
2860 | goto fail; | |
2861 | } | |
2862 | ||
2863 | } else { | |
2864 | if (e->watchdog_fd >= 0) { | |
2865 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2866 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2867 | } |
2868 | } | |
2869 | ||
2870 | e->watchdog = !!b; | |
2871 | return e->watchdog; | |
2872 | ||
2873 | fail: | |
03e334a1 | 2874 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2875 | return r; |
2876 | } | |
8f726607 LP |
2877 | |
2878 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2879 | assert_return(e, -EINVAL); | |
2880 | assert_return(!event_pid_changed(e), -ECHILD); | |
2881 | ||
2882 | return e->watchdog; | |
2883 | } |