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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
fd38203a LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Lennart Poettering | |
fd38203a LP |
6 | ***/ |
7 | ||
8 | #include <sys/epoll.h> | |
9 | #include <sys/timerfd.h> | |
10 | #include <sys/wait.h> | |
11 | ||
cde93897 | 12 | #include "sd-daemon.h" |
07630cea LP |
13 | #include "sd-event.h" |
14 | #include "sd-id128.h" | |
15 | ||
b5efdb8a | 16 | #include "alloc-util.h" |
3ffd4af2 | 17 | #include "fd-util.h" |
fd38203a | 18 | #include "hashmap.h" |
07630cea LP |
19 | #include "list.h" |
20 | #include "macro.h" | |
afc6adb5 | 21 | #include "missing.h" |
07630cea | 22 | #include "prioq.h" |
4a0b58c4 | 23 | #include "process-util.h" |
6e9feda3 | 24 | #include "set.h" |
24882e06 | 25 | #include "signal-util.h" |
55cbfaa5 | 26 | #include "string-table.h" |
07630cea LP |
27 | #include "string-util.h" |
28 | #include "time-util.h" | |
29 | #include "util.h" | |
fd38203a | 30 | |
c2ba3ad6 | 31 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a LP |
32 | |
33 | typedef enum EventSourceType { | |
34 | SOURCE_IO, | |
6a0f1f6d | 35 | SOURCE_TIME_REALTIME, |
a8548816 | 36 | SOURCE_TIME_BOOTTIME, |
6a0f1f6d LP |
37 | SOURCE_TIME_MONOTONIC, |
38 | SOURCE_TIME_REALTIME_ALARM, | |
39 | SOURCE_TIME_BOOTTIME_ALARM, | |
fd38203a LP |
40 | SOURCE_SIGNAL, |
41 | SOURCE_CHILD, | |
da7e457c | 42 | SOURCE_DEFER, |
6e9feda3 | 43 | SOURCE_POST, |
6203e07a | 44 | SOURCE_EXIT, |
6a0f1f6d | 45 | SOURCE_WATCHDOG, |
a71fe8b8 | 46 | _SOURCE_EVENT_SOURCE_TYPE_MAX, |
6a0f1f6d | 47 | _SOURCE_EVENT_SOURCE_TYPE_INVALID = -1 |
fd38203a LP |
48 | } EventSourceType; |
49 | ||
55cbfaa5 DM |
50 | static const char* const event_source_type_table[_SOURCE_EVENT_SOURCE_TYPE_MAX] = { |
51 | [SOURCE_IO] = "io", | |
52 | [SOURCE_TIME_REALTIME] = "realtime", | |
53 | [SOURCE_TIME_BOOTTIME] = "bootime", | |
54 | [SOURCE_TIME_MONOTONIC] = "monotonic", | |
55 | [SOURCE_TIME_REALTIME_ALARM] = "realtime-alarm", | |
56 | [SOURCE_TIME_BOOTTIME_ALARM] = "boottime-alarm", | |
57 | [SOURCE_SIGNAL] = "signal", | |
58 | [SOURCE_CHILD] = "child", | |
59 | [SOURCE_DEFER] = "defer", | |
60 | [SOURCE_POST] = "post", | |
61 | [SOURCE_EXIT] = "exit", | |
62 | [SOURCE_WATCHDOG] = "watchdog", | |
63 | }; | |
64 | ||
65 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(event_source_type, int); | |
66 | ||
9da4cb2b LP |
67 | /* All objects we use in epoll events start with this value, so that |
68 | * we know how to dispatch it */ | |
69 | typedef enum WakeupType { | |
70 | WAKEUP_NONE, | |
71 | WAKEUP_EVENT_SOURCE, | |
72 | WAKEUP_CLOCK_DATA, | |
73 | WAKEUP_SIGNAL_DATA, | |
74 | _WAKEUP_TYPE_MAX, | |
75 | _WAKEUP_TYPE_INVALID = -1, | |
76 | } WakeupType; | |
77 | ||
a8548816 | 78 | #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 | 79 | |
fd38203a | 80 | struct sd_event_source { |
9da4cb2b LP |
81 | WakeupType wakeup; |
82 | ||
da7e457c | 83 | unsigned n_ref; |
fd38203a LP |
84 | |
85 | sd_event *event; | |
86 | void *userdata; | |
718db961 | 87 | sd_event_handler_t prepare; |
fd38203a | 88 | |
356779df | 89 | char *description; |
f7f53e9e | 90 | |
6a0f1f6d | 91 | EventSourceType type:5; |
baf76283 | 92 | int enabled:3; |
fd38203a | 93 | bool pending:1; |
12179984 | 94 | bool dispatching:1; |
a71fe8b8 | 95 | bool floating:1; |
fd38203a | 96 | |
31927c16 | 97 | int64_t priority; |
fd38203a LP |
98 | unsigned pending_index; |
99 | unsigned prepare_index; | |
60a3b1e1 LP |
100 | uint64_t pending_iteration; |
101 | uint64_t prepare_iteration; | |
fd38203a | 102 | |
a71fe8b8 LP |
103 | LIST_FIELDS(sd_event_source, sources); |
104 | ||
fd38203a LP |
105 | union { |
106 | struct { | |
718db961 | 107 | sd_event_io_handler_t callback; |
fd38203a LP |
108 | int fd; |
109 | uint32_t events; | |
110 | uint32_t revents; | |
111 | bool registered:1; | |
ab93297c | 112 | bool owned:1; |
fd38203a LP |
113 | } io; |
114 | struct { | |
718db961 | 115 | sd_event_time_handler_t callback; |
c2ba3ad6 LP |
116 | usec_t next, accuracy; |
117 | unsigned earliest_index; | |
118 | unsigned latest_index; | |
fd38203a LP |
119 | } time; |
120 | struct { | |
718db961 | 121 | sd_event_signal_handler_t callback; |
fd38203a LP |
122 | struct signalfd_siginfo siginfo; |
123 | int sig; | |
124 | } signal; | |
125 | struct { | |
718db961 | 126 | sd_event_child_handler_t callback; |
fd38203a LP |
127 | siginfo_t siginfo; |
128 | pid_t pid; | |
129 | int options; | |
130 | } child; | |
131 | struct { | |
718db961 | 132 | sd_event_handler_t callback; |
fd38203a | 133 | } defer; |
6e9feda3 LP |
134 | struct { |
135 | sd_event_handler_t callback; | |
136 | } post; | |
da7e457c | 137 | struct { |
718db961 | 138 | sd_event_handler_t callback; |
da7e457c | 139 | unsigned prioq_index; |
6203e07a | 140 | } exit; |
fd38203a LP |
141 | }; |
142 | }; | |
143 | ||
6a0f1f6d | 144 | struct clock_data { |
9da4cb2b | 145 | WakeupType wakeup; |
6a0f1f6d LP |
146 | int fd; |
147 | ||
148 | /* For all clocks we maintain two priority queues each, one | |
149 | * ordered for the earliest times the events may be | |
150 | * dispatched, and one ordered by the latest times they must | |
151 | * have been dispatched. The range between the top entries in | |
152 | * the two prioqs is the time window we can freely schedule | |
153 | * wakeups in */ | |
154 | ||
155 | Prioq *earliest; | |
156 | Prioq *latest; | |
157 | usec_t next; | |
212bbb17 TG |
158 | |
159 | bool needs_rearm:1; | |
6a0f1f6d LP |
160 | }; |
161 | ||
9da4cb2b LP |
162 | struct signal_data { |
163 | WakeupType wakeup; | |
164 | ||
165 | /* For each priority we maintain one signal fd, so that we | |
166 | * only have to dequeue a single event per priority at a | |
167 | * time. */ | |
168 | ||
169 | int fd; | |
170 | int64_t priority; | |
171 | sigset_t sigset; | |
172 | sd_event_source *current; | |
173 | }; | |
174 | ||
fd38203a | 175 | struct sd_event { |
da7e457c | 176 | unsigned n_ref; |
fd38203a LP |
177 | |
178 | int epoll_fd; | |
cde93897 | 179 | int watchdog_fd; |
fd38203a LP |
180 | |
181 | Prioq *pending; | |
182 | Prioq *prepare; | |
c2ba3ad6 | 183 | |
a8548816 | 184 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
185 | * can add support for more clocks when the kernel learns to |
186 | * deal with them, too. */ | |
187 | struct clock_data realtime; | |
a8548816 | 188 | struct clock_data boottime; |
6a0f1f6d LP |
189 | struct clock_data monotonic; |
190 | struct clock_data realtime_alarm; | |
191 | struct clock_data boottime_alarm; | |
fd38203a | 192 | |
da7e457c LP |
193 | usec_t perturb; |
194 | ||
9da4cb2b LP |
195 | sd_event_source **signal_sources; /* indexed by signal number */ |
196 | Hashmap *signal_data; /* indexed by priority */ | |
fd38203a LP |
197 | |
198 | Hashmap *child_sources; | |
baf76283 | 199 | unsigned n_enabled_child_sources; |
fd38203a | 200 | |
6e9feda3 LP |
201 | Set *post_sources; |
202 | ||
6203e07a | 203 | Prioq *exit; |
fd38203a | 204 | |
da7e457c | 205 | pid_t original_pid; |
c2ba3ad6 | 206 | |
60a3b1e1 | 207 | uint64_t iteration; |
e475d10c | 208 | triple_timestamp timestamp; |
da7e457c | 209 | int state; |
eaa3cbef | 210 | |
6203e07a | 211 | bool exit_requested:1; |
da7e457c | 212 | bool need_process_child:1; |
cde93897 | 213 | bool watchdog:1; |
34b87517 | 214 | bool profile_delays:1; |
afc6adb5 | 215 | |
6203e07a LP |
216 | int exit_code; |
217 | ||
afc6adb5 LP |
218 | pid_t tid; |
219 | sd_event **default_event_ptr; | |
cde93897 LP |
220 | |
221 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
222 | |
223 | unsigned n_sources; | |
a71fe8b8 LP |
224 | |
225 | LIST_HEAD(sd_event_source, sources); | |
34b87517 VC |
226 | |
227 | usec_t last_run, last_log; | |
228 | unsigned delays[sizeof(usec_t) * 8]; | |
fd38203a LP |
229 | }; |
230 | ||
b937d761 NM |
231 | static thread_local sd_event *default_event = NULL; |
232 | ||
a71fe8b8 LP |
233 | static void source_disconnect(sd_event_source *s); |
234 | ||
b937d761 NM |
235 | static sd_event *event_resolve(sd_event *e) { |
236 | return e == SD_EVENT_DEFAULT ? default_event : e; | |
237 | } | |
238 | ||
fd38203a LP |
239 | static int pending_prioq_compare(const void *a, const void *b) { |
240 | const sd_event_source *x = a, *y = b; | |
241 | ||
242 | assert(x->pending); | |
243 | assert(y->pending); | |
244 | ||
baf76283 LP |
245 | /* Enabled ones first */ |
246 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 247 | return -1; |
baf76283 | 248 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
249 | return 1; |
250 | ||
251 | /* Lower priority values first */ | |
252 | if (x->priority < y->priority) | |
253 | return -1; | |
254 | if (x->priority > y->priority) | |
255 | return 1; | |
256 | ||
257 | /* Older entries first */ | |
258 | if (x->pending_iteration < y->pending_iteration) | |
259 | return -1; | |
260 | if (x->pending_iteration > y->pending_iteration) | |
261 | return 1; | |
262 | ||
fd38203a LP |
263 | return 0; |
264 | } | |
265 | ||
266 | static int prepare_prioq_compare(const void *a, const void *b) { | |
267 | const sd_event_source *x = a, *y = b; | |
268 | ||
269 | assert(x->prepare); | |
270 | assert(y->prepare); | |
271 | ||
8046c457 KK |
272 | /* Enabled ones first */ |
273 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
274 | return -1; | |
275 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
276 | return 1; | |
277 | ||
fd38203a LP |
278 | /* Move most recently prepared ones last, so that we can stop |
279 | * preparing as soon as we hit one that has already been | |
280 | * prepared in the current iteration */ | |
281 | if (x->prepare_iteration < y->prepare_iteration) | |
282 | return -1; | |
283 | if (x->prepare_iteration > y->prepare_iteration) | |
284 | return 1; | |
285 | ||
fd38203a LP |
286 | /* Lower priority values first */ |
287 | if (x->priority < y->priority) | |
288 | return -1; | |
289 | if (x->priority > y->priority) | |
290 | return 1; | |
291 | ||
fd38203a LP |
292 | return 0; |
293 | } | |
294 | ||
c2ba3ad6 | 295 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
296 | const sd_event_source *x = a, *y = b; |
297 | ||
6a0f1f6d LP |
298 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
299 | assert(x->type == y->type); | |
fd38203a | 300 | |
baf76283 LP |
301 | /* Enabled ones first */ |
302 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 303 | return -1; |
baf76283 | 304 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
305 | return 1; |
306 | ||
307 | /* Move the pending ones to the end */ | |
308 | if (!x->pending && y->pending) | |
309 | return -1; | |
310 | if (x->pending && !y->pending) | |
311 | return 1; | |
312 | ||
313 | /* Order by time */ | |
314 | if (x->time.next < y->time.next) | |
315 | return -1; | |
316 | if (x->time.next > y->time.next) | |
a99badf5 | 317 | return 1; |
fd38203a | 318 | |
fd38203a LP |
319 | return 0; |
320 | } | |
321 | ||
1bce0ffa LP |
322 | static usec_t time_event_source_latest(const sd_event_source *s) { |
323 | return usec_add(s->time.next, s->time.accuracy); | |
324 | } | |
325 | ||
c2ba3ad6 LP |
326 | static int latest_time_prioq_compare(const void *a, const void *b) { |
327 | const sd_event_source *x = a, *y = b; | |
328 | ||
6a0f1f6d LP |
329 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
330 | assert(x->type == y->type); | |
c2ba3ad6 | 331 | |
baf76283 LP |
332 | /* Enabled ones first */ |
333 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 334 | return -1; |
baf76283 | 335 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
336 | return 1; |
337 | ||
338 | /* Move the pending ones to the end */ | |
339 | if (!x->pending && y->pending) | |
340 | return -1; | |
341 | if (x->pending && !y->pending) | |
342 | return 1; | |
343 | ||
344 | /* Order by time */ | |
1bce0ffa | 345 | if (time_event_source_latest(x) < time_event_source_latest(y)) |
c2ba3ad6 | 346 | return -1; |
1bce0ffa | 347 | if (time_event_source_latest(x) > time_event_source_latest(y)) |
a99badf5 | 348 | return 1; |
c2ba3ad6 | 349 | |
c2ba3ad6 LP |
350 | return 0; |
351 | } | |
352 | ||
6203e07a | 353 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
354 | const sd_event_source *x = a, *y = b; |
355 | ||
6203e07a LP |
356 | assert(x->type == SOURCE_EXIT); |
357 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 358 | |
baf76283 LP |
359 | /* Enabled ones first */ |
360 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 361 | return -1; |
baf76283 | 362 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
363 | return 1; |
364 | ||
365 | /* Lower priority values first */ | |
366 | if (x->priority < y->priority) | |
367 | return -1; | |
368 | if (x->priority > y->priority) | |
369 | return 1; | |
370 | ||
da7e457c LP |
371 | return 0; |
372 | } | |
373 | ||
6a0f1f6d LP |
374 | static void free_clock_data(struct clock_data *d) { |
375 | assert(d); | |
9da4cb2b | 376 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
377 | |
378 | safe_close(d->fd); | |
379 | prioq_free(d->earliest); | |
380 | prioq_free(d->latest); | |
381 | } | |
382 | ||
fd38203a | 383 | static void event_free(sd_event *e) { |
a71fe8b8 LP |
384 | sd_event_source *s; |
385 | ||
fd38203a | 386 | assert(e); |
a71fe8b8 LP |
387 | |
388 | while ((s = e->sources)) { | |
389 | assert(s->floating); | |
390 | source_disconnect(s); | |
391 | sd_event_source_unref(s); | |
392 | } | |
393 | ||
15b38f93 | 394 | assert(e->n_sources == 0); |
fd38203a | 395 | |
afc6adb5 LP |
396 | if (e->default_event_ptr) |
397 | *(e->default_event_ptr) = NULL; | |
398 | ||
03e334a1 | 399 | safe_close(e->epoll_fd); |
03e334a1 | 400 | safe_close(e->watchdog_fd); |
cde93897 | 401 | |
6a0f1f6d | 402 | free_clock_data(&e->realtime); |
a8548816 | 403 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
404 | free_clock_data(&e->monotonic); |
405 | free_clock_data(&e->realtime_alarm); | |
406 | free_clock_data(&e->boottime_alarm); | |
407 | ||
fd38203a LP |
408 | prioq_free(e->pending); |
409 | prioq_free(e->prepare); | |
6203e07a | 410 | prioq_free(e->exit); |
fd38203a LP |
411 | |
412 | free(e->signal_sources); | |
9da4cb2b | 413 | hashmap_free(e->signal_data); |
fd38203a LP |
414 | |
415 | hashmap_free(e->child_sources); | |
6e9feda3 | 416 | set_free(e->post_sources); |
fd38203a LP |
417 | free(e); |
418 | } | |
419 | ||
f7262a9f | 420 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
421 | sd_event *e; |
422 | int r; | |
423 | ||
305f78bf | 424 | assert_return(ret, -EINVAL); |
fd38203a LP |
425 | |
426 | e = new0(sd_event, 1); | |
427 | if (!e) | |
428 | return -ENOMEM; | |
429 | ||
da7e457c | 430 | e->n_ref = 1; |
9da4cb2b | 431 | 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 | 432 | e->realtime.next = e->boottime.next = e->monotonic.next = e->realtime_alarm.next = e->boottime_alarm.next = USEC_INFINITY; |
9da4cb2b | 433 | e->realtime.wakeup = e->boottime.wakeup = e->monotonic.wakeup = e->realtime_alarm.wakeup = e->boottime_alarm.wakeup = WAKEUP_CLOCK_DATA; |
df0ff127 | 434 | e->original_pid = getpid_cached(); |
3a43da28 | 435 | e->perturb = USEC_INFINITY; |
fd38203a | 436 | |
c983e776 EV |
437 | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
438 | if (r < 0) | |
fd38203a | 439 | goto fail; |
fd38203a LP |
440 | |
441 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
442 | if (e->epoll_fd < 0) { | |
443 | r = -errno; | |
444 | goto fail; | |
445 | } | |
446 | ||
7fe2903c LP |
447 | e->epoll_fd = fd_move_above_stdio(e->epoll_fd); |
448 | ||
34b87517 | 449 | if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) { |
34a6843d | 450 | 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 |
451 | e->profile_delays = true; |
452 | } | |
453 | ||
fd38203a LP |
454 | *ret = e; |
455 | return 0; | |
456 | ||
457 | fail: | |
458 | event_free(e); | |
459 | return r; | |
460 | } | |
461 | ||
f7262a9f | 462 | _public_ sd_event* sd_event_ref(sd_event *e) { |
6680dd6b LP |
463 | |
464 | if (!e) | |
465 | return NULL; | |
fd38203a | 466 | |
da7e457c LP |
467 | assert(e->n_ref >= 1); |
468 | e->n_ref++; | |
fd38203a LP |
469 | |
470 | return e; | |
471 | } | |
472 | ||
f7262a9f | 473 | _public_ sd_event* sd_event_unref(sd_event *e) { |
5b1bc83f LP |
474 | |
475 | if (!e) | |
476 | return NULL; | |
fd38203a | 477 | |
da7e457c LP |
478 | assert(e->n_ref >= 1); |
479 | e->n_ref--; | |
480 | ||
481 | if (e->n_ref <= 0) | |
fd38203a LP |
482 | event_free(e); |
483 | ||
484 | return NULL; | |
485 | } | |
486 | ||
eaa3cbef LP |
487 | static bool event_pid_changed(sd_event *e) { |
488 | assert(e); | |
489 | ||
a2360a46 | 490 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
491 | * it around over a fork(). Let's complain. */ |
492 | ||
df0ff127 | 493 | return e->original_pid != getpid_cached(); |
eaa3cbef LP |
494 | } |
495 | ||
366e6411 | 496 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
497 | int r; |
498 | ||
499 | assert(s); | |
500 | assert(s->type == SOURCE_IO); | |
501 | ||
f6806734 | 502 | if (event_pid_changed(s->event)) |
366e6411 | 503 | return; |
f6806734 | 504 | |
fd38203a | 505 | if (!s->io.registered) |
366e6411 | 506 | return; |
fd38203a LP |
507 | |
508 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
556c25cf | 509 | if (r < 0) |
55cbfaa5 DM |
510 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m", |
511 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a LP |
512 | |
513 | s->io.registered = false; | |
fd38203a LP |
514 | } |
515 | ||
305f78bf LP |
516 | static int source_io_register( |
517 | sd_event_source *s, | |
518 | int enabled, | |
519 | uint32_t events) { | |
520 | ||
fd38203a LP |
521 | struct epoll_event ev = {}; |
522 | int r; | |
523 | ||
524 | assert(s); | |
525 | assert(s->type == SOURCE_IO); | |
baf76283 | 526 | assert(enabled != SD_EVENT_OFF); |
fd38203a LP |
527 | |
528 | ev.events = events; | |
529 | ev.data.ptr = s; | |
530 | ||
baf76283 | 531 | if (enabled == SD_EVENT_ONESHOT) |
fd38203a LP |
532 | ev.events |= EPOLLONESHOT; |
533 | ||
534 | if (s->io.registered) | |
535 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
536 | else | |
537 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
fd38203a LP |
538 | if (r < 0) |
539 | return -errno; | |
540 | ||
541 | s->io.registered = true; | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
6a0f1f6d LP |
546 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
547 | ||
548 | switch (t) { | |
549 | ||
550 | case SOURCE_TIME_REALTIME: | |
551 | return CLOCK_REALTIME; | |
552 | ||
a8548816 TG |
553 | case SOURCE_TIME_BOOTTIME: |
554 | return CLOCK_BOOTTIME; | |
555 | ||
6a0f1f6d LP |
556 | case SOURCE_TIME_MONOTONIC: |
557 | return CLOCK_MONOTONIC; | |
558 | ||
559 | case SOURCE_TIME_REALTIME_ALARM: | |
560 | return CLOCK_REALTIME_ALARM; | |
561 | ||
562 | case SOURCE_TIME_BOOTTIME_ALARM: | |
563 | return CLOCK_BOOTTIME_ALARM; | |
564 | ||
565 | default: | |
566 | return (clockid_t) -1; | |
567 | } | |
568 | } | |
569 | ||
570 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
571 | ||
572 | switch (clock) { | |
573 | ||
574 | case CLOCK_REALTIME: | |
575 | return SOURCE_TIME_REALTIME; | |
576 | ||
a8548816 TG |
577 | case CLOCK_BOOTTIME: |
578 | return SOURCE_TIME_BOOTTIME; | |
579 | ||
6a0f1f6d LP |
580 | case CLOCK_MONOTONIC: |
581 | return SOURCE_TIME_MONOTONIC; | |
582 | ||
583 | case CLOCK_REALTIME_ALARM: | |
584 | return SOURCE_TIME_REALTIME_ALARM; | |
585 | ||
586 | case CLOCK_BOOTTIME_ALARM: | |
587 | return SOURCE_TIME_BOOTTIME_ALARM; | |
588 | ||
589 | default: | |
590 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
591 | } | |
592 | } | |
593 | ||
594 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
595 | assert(e); | |
596 | ||
597 | switch (t) { | |
598 | ||
599 | case SOURCE_TIME_REALTIME: | |
600 | return &e->realtime; | |
601 | ||
a8548816 TG |
602 | case SOURCE_TIME_BOOTTIME: |
603 | return &e->boottime; | |
604 | ||
6a0f1f6d LP |
605 | case SOURCE_TIME_MONOTONIC: |
606 | return &e->monotonic; | |
607 | ||
608 | case SOURCE_TIME_REALTIME_ALARM: | |
609 | return &e->realtime_alarm; | |
610 | ||
611 | case SOURCE_TIME_BOOTTIME_ALARM: | |
612 | return &e->boottime_alarm; | |
613 | ||
614 | default: | |
615 | return NULL; | |
616 | } | |
617 | } | |
618 | ||
9da4cb2b LP |
619 | static int event_make_signal_data( |
620 | sd_event *e, | |
621 | int sig, | |
622 | struct signal_data **ret) { | |
4807d2d0 | 623 | |
f95387cd | 624 | struct epoll_event ev = {}; |
9da4cb2b LP |
625 | struct signal_data *d; |
626 | bool added = false; | |
627 | sigset_t ss_copy; | |
628 | int64_t priority; | |
f95387cd ZJS |
629 | int r; |
630 | ||
631 | assert(e); | |
632 | ||
f6806734 | 633 | if (event_pid_changed(e)) |
9da4cb2b | 634 | return -ECHILD; |
f6806734 | 635 | |
9da4cb2b LP |
636 | if (e->signal_sources && e->signal_sources[sig]) |
637 | priority = e->signal_sources[sig]->priority; | |
638 | else | |
639 | priority = 0; | |
f95387cd | 640 | |
9da4cb2b LP |
641 | d = hashmap_get(e->signal_data, &priority); |
642 | if (d) { | |
643 | if (sigismember(&d->sigset, sig) > 0) { | |
644 | if (ret) | |
645 | *ret = d; | |
646 | return 0; | |
647 | } | |
648 | } else { | |
649 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); | |
650 | if (r < 0) | |
651 | return r; | |
652 | ||
653 | d = new0(struct signal_data, 1); | |
654 | if (!d) | |
655 | return -ENOMEM; | |
656 | ||
657 | d->wakeup = WAKEUP_SIGNAL_DATA; | |
658 | d->fd = -1; | |
659 | d->priority = priority; | |
660 | ||
661 | r = hashmap_put(e->signal_data, &d->priority, d); | |
90f604d1 ZJS |
662 | if (r < 0) { |
663 | free(d); | |
9da4cb2b | 664 | return r; |
90f604d1 | 665 | } |
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 | ||
7fe2903c | 687 | d->fd = fd_move_above_stdio(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); | |
9da4cb2b LP |
730 | safe_close(d->fd); |
731 | free(d); | |
732 | return; | |
733 | } | |
734 | ||
735 | assert(d->fd >= 0); | |
736 | ||
737 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
738 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
739 | } | |
740 | ||
741 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
742 | struct signal_data *d; | |
743 | static const int64_t zero_priority = 0; | |
744 | ||
745 | assert(e); | |
746 | ||
747 | /* Rechecks if the specified signal is still something we are | |
748 | * interested in. If not, we'll unmask it, and possibly drop | |
749 | * the signalfd for it. */ | |
750 | ||
751 | if (sig == SIGCHLD && | |
752 | e->n_enabled_child_sources > 0) | |
753 | return; | |
754 | ||
755 | if (e->signal_sources && | |
756 | e->signal_sources[sig] && | |
757 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
758 | return; | |
759 | ||
760 | /* | |
761 | * The specified signal might be enabled in three different queues: | |
762 | * | |
763 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
764 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
765 | * 3) the 0 priority (to cover the SIGCHLD case) | |
766 | * | |
767 | * Hence, let's remove it from all three here. | |
768 | */ | |
769 | ||
770 | if (priority) { | |
771 | d = hashmap_get(e->signal_data, priority); | |
772 | if (d) | |
773 | event_unmask_signal_data(e, d, sig); | |
774 | } | |
775 | ||
776 | if (e->signal_sources && e->signal_sources[sig]) { | |
777 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
778 | if (d) | |
779 | event_unmask_signal_data(e, d, sig); | |
780 | } | |
781 | ||
782 | d = hashmap_get(e->signal_data, &zero_priority); | |
783 | if (d) | |
784 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
785 | } |
786 | ||
a71fe8b8 LP |
787 | static void source_disconnect(sd_event_source *s) { |
788 | sd_event *event; | |
789 | ||
fd38203a LP |
790 | assert(s); |
791 | ||
a71fe8b8 LP |
792 | if (!s->event) |
793 | return; | |
15b38f93 | 794 | |
a71fe8b8 | 795 | assert(s->event->n_sources > 0); |
fd38203a | 796 | |
a71fe8b8 | 797 | switch (s->type) { |
fd38203a | 798 | |
a71fe8b8 LP |
799 | case SOURCE_IO: |
800 | if (s->io.fd >= 0) | |
801 | source_io_unregister(s); | |
fd38203a | 802 | |
a71fe8b8 | 803 | break; |
6a0f1f6d | 804 | |
a71fe8b8 | 805 | case SOURCE_TIME_REALTIME: |
a8548816 | 806 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
807 | case SOURCE_TIME_MONOTONIC: |
808 | case SOURCE_TIME_REALTIME_ALARM: | |
809 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
810 | struct clock_data *d; | |
fd38203a | 811 | |
a71fe8b8 LP |
812 | d = event_get_clock_data(s->event, s->type); |
813 | assert(d); | |
814 | ||
815 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
816 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 817 | d->needs_rearm = true; |
a71fe8b8 LP |
818 | break; |
819 | } | |
820 | ||
821 | case SOURCE_SIGNAL: | |
822 | if (s->signal.sig > 0) { | |
9da4cb2b | 823 | |
a71fe8b8 LP |
824 | if (s->event->signal_sources) |
825 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 826 | |
9da4cb2b | 827 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 828 | } |
fd38203a | 829 | |
a71fe8b8 | 830 | break; |
fd38203a | 831 | |
a71fe8b8 LP |
832 | case SOURCE_CHILD: |
833 | if (s->child.pid > 0) { | |
834 | if (s->enabled != SD_EVENT_OFF) { | |
835 | assert(s->event->n_enabled_child_sources > 0); | |
836 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 837 | } |
fd38203a | 838 | |
4a0b58c4 | 839 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
9da4cb2b | 840 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
a71fe8b8 | 841 | } |
fd38203a | 842 | |
a71fe8b8 | 843 | break; |
fd38203a | 844 | |
a71fe8b8 LP |
845 | case SOURCE_DEFER: |
846 | /* nothing */ | |
847 | break; | |
fd38203a | 848 | |
a71fe8b8 LP |
849 | case SOURCE_POST: |
850 | set_remove(s->event->post_sources, s); | |
851 | break; | |
da7e457c | 852 | |
a71fe8b8 LP |
853 | case SOURCE_EXIT: |
854 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
855 | break; | |
0eb2e0e3 | 856 | |
a71fe8b8 LP |
857 | default: |
858 | assert_not_reached("Wut? I shouldn't exist."); | |
859 | } | |
6e9feda3 | 860 | |
a71fe8b8 LP |
861 | if (s->pending) |
862 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 863 | |
a71fe8b8 LP |
864 | if (s->prepare) |
865 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 866 | |
a71fe8b8 | 867 | event = s->event; |
fd38203a | 868 | |
a71fe8b8 LP |
869 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
870 | s->event = NULL; | |
871 | LIST_REMOVE(sources, event->sources, s); | |
872 | event->n_sources--; | |
fd38203a | 873 | |
a71fe8b8 LP |
874 | if (!s->floating) |
875 | sd_event_unref(event); | |
876 | } | |
877 | ||
878 | static void source_free(sd_event_source *s) { | |
879 | assert(s); | |
fd38203a | 880 | |
a71fe8b8 | 881 | source_disconnect(s); |
ab93297c NM |
882 | |
883 | if (s->type == SOURCE_IO && s->io.owned) | |
884 | safe_close(s->io.fd); | |
885 | ||
356779df | 886 | free(s->description); |
fd38203a LP |
887 | free(s); |
888 | } | |
889 | ||
890 | static int source_set_pending(sd_event_source *s, bool b) { | |
891 | int r; | |
892 | ||
893 | assert(s); | |
6203e07a | 894 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
895 | |
896 | if (s->pending == b) | |
897 | return 0; | |
898 | ||
899 | s->pending = b; | |
900 | ||
901 | if (b) { | |
902 | s->pending_iteration = s->event->iteration; | |
903 | ||
904 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
905 | if (r < 0) { | |
906 | s->pending = false; | |
907 | return r; | |
908 | } | |
909 | } else | |
910 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
911 | ||
6a0f1f6d LP |
912 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
913 | struct clock_data *d; | |
914 | ||
915 | d = event_get_clock_data(s->event, s->type); | |
916 | assert(d); | |
917 | ||
918 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
919 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 920 | d->needs_rearm = true; |
2576a19e LP |
921 | } |
922 | ||
9da4cb2b LP |
923 | if (s->type == SOURCE_SIGNAL && !b) { |
924 | struct signal_data *d; | |
925 | ||
926 | d = hashmap_get(s->event->signal_data, &s->priority); | |
927 | if (d && d->current == s) | |
928 | d->current = NULL; | |
929 | } | |
930 | ||
fd38203a LP |
931 | return 0; |
932 | } | |
933 | ||
a71fe8b8 | 934 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
935 | sd_event_source *s; |
936 | ||
937 | assert(e); | |
938 | ||
939 | s = new0(sd_event_source, 1); | |
940 | if (!s) | |
941 | return NULL; | |
942 | ||
da7e457c | 943 | s->n_ref = 1; |
a71fe8b8 | 944 | s->event = e; |
4a134c49 | 945 | s->floating = floating; |
fd38203a | 946 | s->type = type; |
fd38203a | 947 | s->pending_index = s->prepare_index = PRIOQ_IDX_NULL; |
a71fe8b8 LP |
948 | |
949 | if (!floating) | |
950 | sd_event_ref(e); | |
fd38203a | 951 | |
a71fe8b8 | 952 | LIST_PREPEND(sources, e->sources, s); |
313cefa1 | 953 | e->n_sources++; |
15b38f93 | 954 | |
fd38203a LP |
955 | return s; |
956 | } | |
957 | ||
f7262a9f | 958 | _public_ int sd_event_add_io( |
fd38203a | 959 | sd_event *e, |
151b9b96 | 960 | sd_event_source **ret, |
fd38203a LP |
961 | int fd, |
962 | uint32_t events, | |
718db961 | 963 | sd_event_io_handler_t callback, |
151b9b96 | 964 | void *userdata) { |
fd38203a LP |
965 | |
966 | sd_event_source *s; | |
967 | int r; | |
968 | ||
305f78bf | 969 | assert_return(e, -EINVAL); |
b937d761 | 970 | assert_return(e = event_resolve(e), -ENOPKG); |
8ac43fee | 971 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 972 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 973 | assert_return(callback, -EINVAL); |
da7e457c | 974 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 975 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 976 | |
a71fe8b8 | 977 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
978 | if (!s) |
979 | return -ENOMEM; | |
980 | ||
9da4cb2b | 981 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
982 | s->io.fd = fd; |
983 | s->io.events = events; | |
984 | s->io.callback = callback; | |
985 | s->userdata = userdata; | |
baf76283 | 986 | s->enabled = SD_EVENT_ON; |
fd38203a | 987 | |
baf76283 | 988 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
989 | if (r < 0) { |
990 | source_free(s); | |
050f74f2 | 991 | return r; |
fd38203a LP |
992 | } |
993 | ||
a71fe8b8 LP |
994 | if (ret) |
995 | *ret = s; | |
996 | ||
fd38203a LP |
997 | return 0; |
998 | } | |
999 | ||
52444dc4 LP |
1000 | static void initialize_perturb(sd_event *e) { |
1001 | sd_id128_t bootid = {}; | |
1002 | ||
1003 | /* When we sleep for longer, we try to realign the wakeup to | |
1004 | the same time wihtin each minute/second/250ms, so that | |
1005 | events all across the system can be coalesced into a single | |
1006 | CPU wakeup. However, let's take some system-specific | |
1007 | randomness for this value, so that in a network of systems | |
1008 | with synced clocks timer events are distributed a | |
1009 | bit. Here, we calculate a perturbation usec offset from the | |
1010 | boot ID. */ | |
1011 | ||
3a43da28 | 1012 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
1013 | return; |
1014 | ||
1015 | if (sd_id128_get_boot(&bootid) >= 0) | |
1016 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
1017 | } | |
1018 | ||
fd38203a LP |
1019 | static int event_setup_timer_fd( |
1020 | sd_event *e, | |
6a0f1f6d LP |
1021 | struct clock_data *d, |
1022 | clockid_t clock) { | |
fd38203a LP |
1023 | |
1024 | struct epoll_event ev = {}; | |
1025 | int r, fd; | |
1026 | ||
1027 | assert(e); | |
6a0f1f6d | 1028 | assert(d); |
fd38203a | 1029 | |
6a0f1f6d | 1030 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
1031 | return 0; |
1032 | ||
6a0f1f6d | 1033 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
1034 | if (fd < 0) |
1035 | return -errno; | |
1036 | ||
7fe2903c LP |
1037 | fd = fd_move_above_stdio(fd); |
1038 | ||
fd38203a | 1039 | ev.events = EPOLLIN; |
9da4cb2b | 1040 | ev.data.ptr = d; |
fd38203a LP |
1041 | |
1042 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
1043 | if (r < 0) { | |
03e334a1 | 1044 | safe_close(fd); |
fd38203a LP |
1045 | return -errno; |
1046 | } | |
1047 | ||
6a0f1f6d | 1048 | d->fd = fd; |
fd38203a LP |
1049 | return 0; |
1050 | } | |
1051 | ||
c4f1aff2 TG |
1052 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1053 | assert(s); | |
1054 | ||
1055 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1056 | } | |
1057 | ||
6a0f1f6d | 1058 | _public_ int sd_event_add_time( |
fd38203a | 1059 | sd_event *e, |
151b9b96 | 1060 | sd_event_source **ret, |
6a0f1f6d | 1061 | clockid_t clock, |
fd38203a | 1062 | uint64_t usec, |
c2ba3ad6 | 1063 | uint64_t accuracy, |
718db961 | 1064 | sd_event_time_handler_t callback, |
151b9b96 | 1065 | void *userdata) { |
fd38203a | 1066 | |
6a0f1f6d | 1067 | EventSourceType type; |
fd38203a | 1068 | sd_event_source *s; |
6a0f1f6d | 1069 | struct clock_data *d; |
fd38203a LP |
1070 | int r; |
1071 | ||
305f78bf | 1072 | assert_return(e, -EINVAL); |
b937d761 | 1073 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf | 1074 | assert_return(accuracy != (uint64_t) -1, -EINVAL); |
da7e457c | 1075 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1076 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1077 | |
e475d10c LP |
1078 | if (!clock_supported(clock)) /* Checks whether the kernel supports the clock */ |
1079 | return -EOPNOTSUPP; | |
1080 | ||
1081 | type = clock_to_event_source_type(clock); /* checks whether sd-event supports this clock */ | |
1082 | if (type < 0) | |
3411372e LP |
1083 | return -EOPNOTSUPP; |
1084 | ||
c4f1aff2 TG |
1085 | if (!callback) |
1086 | callback = time_exit_callback; | |
1087 | ||
6a0f1f6d LP |
1088 | d = event_get_clock_data(e, type); |
1089 | assert(d); | |
c2ba3ad6 | 1090 | |
c983e776 EV |
1091 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1092 | if (r < 0) | |
1093 | return r; | |
fd38203a | 1094 | |
c983e776 EV |
1095 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1096 | if (r < 0) | |
1097 | return r; | |
fd38203a | 1098 | |
6a0f1f6d LP |
1099 | if (d->fd < 0) { |
1100 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1101 | if (r < 0) |
1102 | return r; | |
1103 | } | |
1104 | ||
a71fe8b8 | 1105 | s = source_new(e, !ret, type); |
fd38203a LP |
1106 | if (!s) |
1107 | return -ENOMEM; | |
1108 | ||
1109 | s->time.next = usec; | |
c2ba3ad6 | 1110 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1111 | s->time.callback = callback; |
da7e457c | 1112 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1113 | s->userdata = userdata; |
baf76283 | 1114 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1115 | |
e07bbb7c TG |
1116 | d->needs_rearm = true; |
1117 | ||
6a0f1f6d | 1118 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 LP |
1119 | if (r < 0) |
1120 | goto fail; | |
1121 | ||
6a0f1f6d | 1122 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 LP |
1123 | if (r < 0) |
1124 | goto fail; | |
fd38203a | 1125 | |
a71fe8b8 LP |
1126 | if (ret) |
1127 | *ret = s; | |
1128 | ||
fd38203a | 1129 | return 0; |
c2ba3ad6 LP |
1130 | |
1131 | fail: | |
1132 | source_free(s); | |
1133 | return r; | |
fd38203a LP |
1134 | } |
1135 | ||
59bc1fd7 LP |
1136 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1137 | assert(s); | |
1138 | ||
1139 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1140 | } | |
1141 | ||
f7262a9f | 1142 | _public_ int sd_event_add_signal( |
305f78bf | 1143 | sd_event *e, |
151b9b96 | 1144 | sd_event_source **ret, |
305f78bf | 1145 | int sig, |
718db961 | 1146 | sd_event_signal_handler_t callback, |
151b9b96 | 1147 | void *userdata) { |
305f78bf | 1148 | |
fd38203a | 1149 | sd_event_source *s; |
9da4cb2b | 1150 | struct signal_data *d; |
3022d74b | 1151 | sigset_t ss; |
fd38203a LP |
1152 | int r; |
1153 | ||
305f78bf | 1154 | assert_return(e, -EINVAL); |
b937d761 | 1155 | assert_return(e = event_resolve(e), -ENOPKG); |
6eb7c172 | 1156 | assert_return(SIGNAL_VALID(sig), -EINVAL); |
da7e457c | 1157 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1158 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1159 | |
59bc1fd7 LP |
1160 | if (!callback) |
1161 | callback = signal_exit_callback; | |
1162 | ||
3022d74b | 1163 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
50e0d56c LP |
1164 | if (r != 0) |
1165 | return -r; | |
3022d74b LP |
1166 | |
1167 | if (!sigismember(&ss, sig)) | |
1168 | return -EBUSY; | |
1169 | ||
fd38203a LP |
1170 | if (!e->signal_sources) { |
1171 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1172 | if (!e->signal_sources) | |
1173 | return -ENOMEM; | |
1174 | } else if (e->signal_sources[sig]) | |
1175 | return -EBUSY; | |
1176 | ||
a71fe8b8 | 1177 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1178 | if (!s) |
1179 | return -ENOMEM; | |
1180 | ||
1181 | s->signal.sig = sig; | |
1182 | s->signal.callback = callback; | |
1183 | s->userdata = userdata; | |
baf76283 | 1184 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1185 | |
1186 | e->signal_sources[sig] = s; | |
fd38203a | 1187 | |
9da4cb2b LP |
1188 | r = event_make_signal_data(e, sig, &d); |
1189 | if (r < 0) { | |
1190 | source_free(s); | |
1191 | return r; | |
fd38203a LP |
1192 | } |
1193 | ||
f1f00dbb LP |
1194 | /* Use the signal name as description for the event source by default */ |
1195 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1196 | ||
a71fe8b8 LP |
1197 | if (ret) |
1198 | *ret = s; | |
1199 | ||
fd38203a LP |
1200 | return 0; |
1201 | } | |
1202 | ||
f7262a9f | 1203 | _public_ int sd_event_add_child( |
305f78bf | 1204 | sd_event *e, |
151b9b96 | 1205 | sd_event_source **ret, |
305f78bf LP |
1206 | pid_t pid, |
1207 | int options, | |
718db961 | 1208 | sd_event_child_handler_t callback, |
151b9b96 | 1209 | void *userdata) { |
305f78bf | 1210 | |
fd38203a LP |
1211 | sd_event_source *s; |
1212 | int r; | |
1213 | ||
305f78bf | 1214 | assert_return(e, -EINVAL); |
b937d761 | 1215 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf LP |
1216 | assert_return(pid > 1, -EINVAL); |
1217 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1218 | assert_return(options != 0, -EINVAL); | |
1219 | assert_return(callback, -EINVAL); | |
da7e457c | 1220 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1221 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1222 | |
d5099efc | 1223 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1224 | if (r < 0) |
1225 | return r; | |
1226 | ||
4a0b58c4 | 1227 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1228 | return -EBUSY; |
1229 | ||
a71fe8b8 | 1230 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1231 | if (!s) |
1232 | return -ENOMEM; | |
1233 | ||
1234 | s->child.pid = pid; | |
1235 | s->child.options = options; | |
1236 | s->child.callback = callback; | |
1237 | s->userdata = userdata; | |
baf76283 | 1238 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1239 | |
4a0b58c4 | 1240 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
fd38203a LP |
1241 | if (r < 0) { |
1242 | source_free(s); | |
1243 | return r; | |
1244 | } | |
1245 | ||
313cefa1 | 1246 | e->n_enabled_child_sources++; |
fd38203a | 1247 | |
9da4cb2b LP |
1248 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1249 | if (r < 0) { | |
1250 | e->n_enabled_child_sources--; | |
1251 | source_free(s); | |
1252 | return r; | |
fd38203a LP |
1253 | } |
1254 | ||
c2ba3ad6 LP |
1255 | e->need_process_child = true; |
1256 | ||
a71fe8b8 LP |
1257 | if (ret) |
1258 | *ret = s; | |
1259 | ||
fd38203a LP |
1260 | return 0; |
1261 | } | |
1262 | ||
f7262a9f | 1263 | _public_ int sd_event_add_defer( |
305f78bf | 1264 | sd_event *e, |
151b9b96 | 1265 | sd_event_source **ret, |
718db961 | 1266 | sd_event_handler_t callback, |
151b9b96 | 1267 | void *userdata) { |
305f78bf | 1268 | |
fd38203a LP |
1269 | sd_event_source *s; |
1270 | int r; | |
1271 | ||
305f78bf | 1272 | assert_return(e, -EINVAL); |
b937d761 | 1273 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf | 1274 | assert_return(callback, -EINVAL); |
da7e457c | 1275 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1276 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1277 | |
a71fe8b8 | 1278 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1279 | if (!s) |
1280 | return -ENOMEM; | |
1281 | ||
1282 | s->defer.callback = callback; | |
1283 | s->userdata = userdata; | |
baf76283 | 1284 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1285 | |
1286 | r = source_set_pending(s, true); | |
1287 | if (r < 0) { | |
1288 | source_free(s); | |
1289 | return r; | |
1290 | } | |
1291 | ||
a71fe8b8 LP |
1292 | if (ret) |
1293 | *ret = s; | |
1294 | ||
fd38203a LP |
1295 | return 0; |
1296 | } | |
1297 | ||
6e9feda3 LP |
1298 | _public_ int sd_event_add_post( |
1299 | sd_event *e, | |
1300 | sd_event_source **ret, | |
1301 | sd_event_handler_t callback, | |
1302 | void *userdata) { | |
1303 | ||
1304 | sd_event_source *s; | |
1305 | int r; | |
1306 | ||
1307 | assert_return(e, -EINVAL); | |
b937d761 | 1308 | assert_return(e = event_resolve(e), -ENOPKG); |
6e9feda3 | 1309 | assert_return(callback, -EINVAL); |
6e9feda3 LP |
1310 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1311 | assert_return(!event_pid_changed(e), -ECHILD); | |
1312 | ||
d5099efc | 1313 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1314 | if (r < 0) |
1315 | return r; | |
1316 | ||
a71fe8b8 | 1317 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1318 | if (!s) |
1319 | return -ENOMEM; | |
1320 | ||
1321 | s->post.callback = callback; | |
1322 | s->userdata = userdata; | |
1323 | s->enabled = SD_EVENT_ON; | |
1324 | ||
1325 | r = set_put(e->post_sources, s); | |
1326 | if (r < 0) { | |
1327 | source_free(s); | |
1328 | return r; | |
1329 | } | |
1330 | ||
a71fe8b8 LP |
1331 | if (ret) |
1332 | *ret = s; | |
1333 | ||
6e9feda3 LP |
1334 | return 0; |
1335 | } | |
1336 | ||
6203e07a | 1337 | _public_ int sd_event_add_exit( |
305f78bf | 1338 | sd_event *e, |
151b9b96 | 1339 | sd_event_source **ret, |
718db961 | 1340 | sd_event_handler_t callback, |
151b9b96 | 1341 | void *userdata) { |
305f78bf | 1342 | |
da7e457c LP |
1343 | sd_event_source *s; |
1344 | int r; | |
1345 | ||
1346 | assert_return(e, -EINVAL); | |
b937d761 | 1347 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
1348 | assert_return(callback, -EINVAL); |
1349 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1350 | assert_return(!event_pid_changed(e), -ECHILD); | |
1351 | ||
c983e776 EV |
1352 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1353 | if (r < 0) | |
1354 | return r; | |
da7e457c | 1355 | |
a71fe8b8 | 1356 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1357 | if (!s) |
da7e457c | 1358 | return -ENOMEM; |
fd38203a | 1359 | |
6203e07a | 1360 | s->exit.callback = callback; |
da7e457c | 1361 | s->userdata = userdata; |
6203e07a | 1362 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1363 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1364 | |
6203e07a | 1365 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
da7e457c LP |
1366 | if (r < 0) { |
1367 | source_free(s); | |
1368 | return r; | |
1369 | } | |
1370 | ||
a71fe8b8 LP |
1371 | if (ret) |
1372 | *ret = s; | |
1373 | ||
da7e457c LP |
1374 | return 0; |
1375 | } | |
1376 | ||
f7262a9f | 1377 | _public_ sd_event_source* sd_event_source_ref(sd_event_source *s) { |
6680dd6b LP |
1378 | |
1379 | if (!s) | |
1380 | return NULL; | |
da7e457c LP |
1381 | |
1382 | assert(s->n_ref >= 1); | |
1383 | s->n_ref++; | |
fd38203a LP |
1384 | |
1385 | return s; | |
1386 | } | |
1387 | ||
f7262a9f | 1388 | _public_ sd_event_source* sd_event_source_unref(sd_event_source *s) { |
5b1bc83f LP |
1389 | |
1390 | if (!s) | |
1391 | return NULL; | |
fd38203a | 1392 | |
da7e457c LP |
1393 | assert(s->n_ref >= 1); |
1394 | s->n_ref--; | |
1395 | ||
12179984 LP |
1396 | if (s->n_ref <= 0) { |
1397 | /* Here's a special hack: when we are called from a | |
1398 | * dispatch handler we won't free the event source | |
1399 | * immediately, but we will detach the fd from the | |
1400 | * epoll. This way it is safe for the caller to unref | |
1401 | * the event source and immediately close the fd, but | |
1402 | * we still retain a valid event source object after | |
1403 | * the callback. */ | |
1404 | ||
1405 | if (s->dispatching) { | |
1406 | if (s->type == SOURCE_IO) | |
1407 | source_io_unregister(s); | |
a71fe8b8 LP |
1408 | |
1409 | source_disconnect(s); | |
12179984 LP |
1410 | } else |
1411 | source_free(s); | |
1412 | } | |
fd38203a LP |
1413 | |
1414 | return NULL; | |
1415 | } | |
1416 | ||
356779df | 1417 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1418 | assert_return(s, -EINVAL); |
f4b2933e | 1419 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1420 | |
356779df | 1421 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1422 | } |
1423 | ||
356779df | 1424 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1425 | assert_return(s, -EINVAL); |
356779df | 1426 | assert_return(description, -EINVAL); |
f4b2933e LP |
1427 | assert_return(s->description, -ENXIO); |
1428 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
f7f53e9e | 1429 | |
356779df | 1430 | *description = s->description; |
f7f53e9e TG |
1431 | return 0; |
1432 | } | |
1433 | ||
adcc4ca3 | 1434 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1435 | assert_return(s, NULL); |
eaa3cbef LP |
1436 | |
1437 | return s->event; | |
1438 | } | |
1439 | ||
f7262a9f | 1440 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1441 | assert_return(s, -EINVAL); |
6203e07a | 1442 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1443 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1444 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1445 | |
1446 | return s->pending; | |
1447 | } | |
1448 | ||
f7262a9f | 1449 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1450 | assert_return(s, -EINVAL); |
1451 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1452 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1453 | |
1454 | return s->io.fd; | |
1455 | } | |
1456 | ||
30caf8f3 LP |
1457 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1458 | int r; | |
1459 | ||
1460 | assert_return(s, -EINVAL); | |
8ac43fee | 1461 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1462 | assert_return(s->type == SOURCE_IO, -EDOM); |
1463 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1464 | ||
1465 | if (s->io.fd == fd) | |
1466 | return 0; | |
1467 | ||
1468 | if (s->enabled == SD_EVENT_OFF) { | |
1469 | s->io.fd = fd; | |
1470 | s->io.registered = false; | |
1471 | } else { | |
1472 | int saved_fd; | |
1473 | ||
1474 | saved_fd = s->io.fd; | |
1475 | assert(s->io.registered); | |
1476 | ||
1477 | s->io.fd = fd; | |
1478 | s->io.registered = false; | |
1479 | ||
1480 | r = source_io_register(s, s->enabled, s->io.events); | |
1481 | if (r < 0) { | |
1482 | s->io.fd = saved_fd; | |
1483 | s->io.registered = true; | |
1484 | return r; | |
1485 | } | |
1486 | ||
1487 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1488 | } | |
1489 | ||
1490 | return 0; | |
1491 | } | |
1492 | ||
ab93297c NM |
1493 | _public_ int sd_event_source_get_io_fd_own(sd_event_source *s) { |
1494 | assert_return(s, -EINVAL); | |
1495 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1496 | ||
1497 | return s->io.owned; | |
1498 | } | |
1499 | ||
1500 | _public_ int sd_event_source_set_io_fd_own(sd_event_source *s, int own) { | |
1501 | assert_return(s, -EINVAL); | |
1502 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1503 | ||
1504 | s->io.owned = own; | |
1505 | return 0; | |
1506 | } | |
1507 | ||
f7262a9f | 1508 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1509 | assert_return(s, -EINVAL); |
1510 | assert_return(events, -EINVAL); | |
1511 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1512 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1513 | |
1514 | *events = s->io.events; | |
1515 | return 0; | |
1516 | } | |
1517 | ||
f7262a9f | 1518 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1519 | int r; |
1520 | ||
305f78bf LP |
1521 | assert_return(s, -EINVAL); |
1522 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1523 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1524 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1525 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1526 | |
b63c8d4f DH |
1527 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1528 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1529 | return 0; |
1530 | ||
baf76283 | 1531 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1532 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1533 | if (r < 0) |
1534 | return r; | |
1535 | } | |
1536 | ||
1537 | s->io.events = events; | |
503f39c3 | 1538 | source_set_pending(s, false); |
fd38203a LP |
1539 | |
1540 | return 0; | |
1541 | } | |
1542 | ||
f7262a9f | 1543 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1544 | assert_return(s, -EINVAL); |
1545 | assert_return(revents, -EINVAL); | |
1546 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1547 | assert_return(s->pending, -ENODATA); | |
1548 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1549 | |
1550 | *revents = s->io.revents; | |
1551 | return 0; | |
1552 | } | |
1553 | ||
f7262a9f | 1554 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1555 | assert_return(s, -EINVAL); |
1556 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1557 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1558 | |
1559 | return s->signal.sig; | |
1560 | } | |
1561 | ||
31927c16 | 1562 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1563 | assert_return(s, -EINVAL); |
1564 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1565 | |
6680b8d1 ME |
1566 | *priority = s->priority; |
1567 | return 0; | |
fd38203a LP |
1568 | } |
1569 | ||
31927c16 | 1570 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
9da4cb2b LP |
1571 | int r; |
1572 | ||
305f78bf | 1573 | assert_return(s, -EINVAL); |
da7e457c | 1574 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1575 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1576 | |
1577 | if (s->priority == priority) | |
1578 | return 0; | |
1579 | ||
9da4cb2b LP |
1580 | if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { |
1581 | struct signal_data *old, *d; | |
1582 | ||
1583 | /* Move us from the signalfd belonging to the old | |
1584 | * priority to the signalfd of the new priority */ | |
1585 | ||
1586 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
1587 | ||
1588 | s->priority = priority; | |
1589 | ||
1590 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
1591 | if (r < 0) { | |
1592 | s->priority = old->priority; | |
1593 | return r; | |
1594 | } | |
1595 | ||
1596 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
1597 | } else | |
1598 | s->priority = priority; | |
fd38203a LP |
1599 | |
1600 | if (s->pending) | |
c2ba3ad6 | 1601 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1602 | |
1603 | if (s->prepare) | |
c2ba3ad6 | 1604 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1605 | |
6203e07a LP |
1606 | if (s->type == SOURCE_EXIT) |
1607 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1608 | |
fd38203a LP |
1609 | return 0; |
1610 | } | |
1611 | ||
f7262a9f | 1612 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf LP |
1613 | assert_return(s, -EINVAL); |
1614 | assert_return(m, -EINVAL); | |
1615 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1616 | |
baf76283 | 1617 | *m = s->enabled; |
fd38203a LP |
1618 | return 0; |
1619 | } | |
1620 | ||
f7262a9f | 1621 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1622 | int r; |
1623 | ||
305f78bf | 1624 | assert_return(s, -EINVAL); |
945c2931 | 1625 | assert_return(IN_SET(m, SD_EVENT_OFF, SD_EVENT_ON, SD_EVENT_ONESHOT), -EINVAL); |
305f78bf | 1626 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1627 | |
cc567911 LP |
1628 | /* If we are dead anyway, we are fine with turning off |
1629 | * sources, but everything else needs to fail. */ | |
1630 | if (s->event->state == SD_EVENT_FINISHED) | |
1631 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1632 | ||
baf76283 | 1633 | if (s->enabled == m) |
fd38203a LP |
1634 | return 0; |
1635 | ||
baf76283 | 1636 | if (m == SD_EVENT_OFF) { |
fd38203a LP |
1637 | |
1638 | switch (s->type) { | |
1639 | ||
1640 | case SOURCE_IO: | |
366e6411 | 1641 | source_io_unregister(s); |
baf76283 | 1642 | s->enabled = m; |
fd38203a LP |
1643 | break; |
1644 | ||
6a0f1f6d | 1645 | case SOURCE_TIME_REALTIME: |
a8548816 | 1646 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1647 | case SOURCE_TIME_MONOTONIC: |
1648 | case SOURCE_TIME_REALTIME_ALARM: | |
1649 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1650 | struct clock_data *d; | |
fd38203a | 1651 | |
baf76283 | 1652 | s->enabled = m; |
6a0f1f6d LP |
1653 | d = event_get_clock_data(s->event, s->type); |
1654 | assert(d); | |
1655 | ||
1656 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1657 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1658 | d->needs_rearm = true; |
fd38203a | 1659 | break; |
6a0f1f6d | 1660 | } |
fd38203a LP |
1661 | |
1662 | case SOURCE_SIGNAL: | |
baf76283 | 1663 | s->enabled = m; |
4807d2d0 | 1664 | |
9da4cb2b | 1665 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
fd38203a LP |
1666 | break; |
1667 | ||
1668 | case SOURCE_CHILD: | |
baf76283 | 1669 | s->enabled = m; |
fd38203a | 1670 | |
baf76283 LP |
1671 | assert(s->event->n_enabled_child_sources > 0); |
1672 | s->event->n_enabled_child_sources--; | |
fd38203a | 1673 | |
9da4cb2b | 1674 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
fd38203a LP |
1675 | break; |
1676 | ||
6203e07a | 1677 | case SOURCE_EXIT: |
305f78bf | 1678 | s->enabled = m; |
6203e07a | 1679 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1680 | break; |
1681 | ||
1682 | case SOURCE_DEFER: | |
6e9feda3 | 1683 | case SOURCE_POST: |
baf76283 | 1684 | s->enabled = m; |
fd38203a | 1685 | break; |
9d3e3aa5 | 1686 | |
6a0f1f6d | 1687 | default: |
9d3e3aa5 | 1688 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1689 | } |
1690 | ||
1691 | } else { | |
1692 | switch (s->type) { | |
1693 | ||
1694 | case SOURCE_IO: | |
1695 | r = source_io_register(s, m, s->io.events); | |
1696 | if (r < 0) | |
1697 | return r; | |
1698 | ||
baf76283 | 1699 | s->enabled = m; |
fd38203a LP |
1700 | break; |
1701 | ||
6a0f1f6d | 1702 | case SOURCE_TIME_REALTIME: |
a8548816 | 1703 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1704 | case SOURCE_TIME_MONOTONIC: |
1705 | case SOURCE_TIME_REALTIME_ALARM: | |
1706 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1707 | struct clock_data *d; | |
fd38203a | 1708 | |
baf76283 | 1709 | s->enabled = m; |
6a0f1f6d LP |
1710 | d = event_get_clock_data(s->event, s->type); |
1711 | assert(d); | |
1712 | ||
1713 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1714 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1715 | d->needs_rearm = true; |
fd38203a | 1716 | break; |
6a0f1f6d | 1717 | } |
fd38203a LP |
1718 | |
1719 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
1720 | |
1721 | s->enabled = m; | |
9da4cb2b LP |
1722 | |
1723 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
1724 | if (r < 0) { | |
1725 | s->enabled = SD_EVENT_OFF; | |
1726 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
1727 | return r; | |
1728 | } | |
1729 | ||
fd38203a LP |
1730 | break; |
1731 | ||
1732 | case SOURCE_CHILD: | |
4807d2d0 | 1733 | |
9da4cb2b | 1734 | if (s->enabled == SD_EVENT_OFF) |
4807d2d0 | 1735 | s->event->n_enabled_child_sources++; |
7a0d4a3d DH |
1736 | |
1737 | s->enabled = m; | |
9da4cb2b | 1738 | |
10edebf6 | 1739 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
9da4cb2b LP |
1740 | if (r < 0) { |
1741 | s->enabled = SD_EVENT_OFF; | |
1742 | s->event->n_enabled_child_sources--; | |
1743 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
1744 | return r; | |
1745 | } | |
1746 | ||
fd38203a LP |
1747 | break; |
1748 | ||
6203e07a | 1749 | case SOURCE_EXIT: |
305f78bf | 1750 | s->enabled = m; |
6203e07a | 1751 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
1752 | break; |
1753 | ||
1754 | case SOURCE_DEFER: | |
6e9feda3 | 1755 | case SOURCE_POST: |
baf76283 | 1756 | s->enabled = m; |
fd38203a | 1757 | break; |
9d3e3aa5 | 1758 | |
6a0f1f6d | 1759 | default: |
9d3e3aa5 | 1760 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
1761 | } |
1762 | } | |
1763 | ||
1764 | if (s->pending) | |
1765 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
1766 | ||
1767 | if (s->prepare) | |
1768 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
1769 | ||
1770 | return 0; | |
1771 | } | |
1772 | ||
f7262a9f | 1773 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1774 | assert_return(s, -EINVAL); |
1775 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1776 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 1777 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1778 | |
1779 | *usec = s->time.next; | |
1780 | return 0; | |
1781 | } | |
1782 | ||
f7262a9f | 1783 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1784 | struct clock_data *d; |
1785 | ||
305f78bf | 1786 | assert_return(s, -EINVAL); |
6a0f1f6d | 1787 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1788 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1789 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1790 | |
fd38203a | 1791 | s->time.next = usec; |
2576a19e | 1792 | |
0cc1125a | 1793 | source_set_pending(s, false); |
fd38203a | 1794 | |
6a0f1f6d LP |
1795 | d = event_get_clock_data(s->event, s->type); |
1796 | assert(d); | |
1797 | ||
1798 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
1799 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1800 | d->needs_rearm = true; |
fd38203a LP |
1801 | |
1802 | return 0; | |
1803 | } | |
1804 | ||
f7262a9f | 1805 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
1806 | assert_return(s, -EINVAL); |
1807 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 1808 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
1809 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1810 | ||
1811 | *usec = s->time.accuracy; | |
1812 | return 0; | |
1813 | } | |
1814 | ||
f7262a9f | 1815 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d LP |
1816 | struct clock_data *d; |
1817 | ||
305f78bf LP |
1818 | assert_return(s, -EINVAL); |
1819 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 1820 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 1821 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1822 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef LP |
1823 | |
1824 | if (usec == 0) | |
1825 | usec = DEFAULT_ACCURACY_USEC; | |
1826 | ||
eaa3cbef LP |
1827 | s->time.accuracy = usec; |
1828 | ||
2576a19e LP |
1829 | source_set_pending(s, false); |
1830 | ||
6a0f1f6d LP |
1831 | d = event_get_clock_data(s->event, s->type); |
1832 | assert(d); | |
1833 | ||
1834 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 1835 | d->needs_rearm = true; |
6a0f1f6d LP |
1836 | |
1837 | return 0; | |
1838 | } | |
1839 | ||
1840 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
1841 | assert_return(s, -EINVAL); | |
1842 | assert_return(clock, -EINVAL); | |
1843 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
1844 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 1845 | |
6a0f1f6d | 1846 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
1847 | return 0; |
1848 | } | |
1849 | ||
f7262a9f | 1850 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
1851 | assert_return(s, -EINVAL); |
1852 | assert_return(pid, -EINVAL); | |
1853 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
1854 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1855 | ||
1856 | *pid = s->child.pid; | |
1857 | return 0; | |
1858 | } | |
1859 | ||
718db961 | 1860 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
1861 | int r; |
1862 | ||
da7e457c | 1863 | assert_return(s, -EINVAL); |
6203e07a | 1864 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
1865 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1866 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1867 | |
1868 | if (s->prepare == callback) | |
1869 | return 0; | |
1870 | ||
1871 | if (callback && s->prepare) { | |
1872 | s->prepare = callback; | |
1873 | return 0; | |
1874 | } | |
1875 | ||
1876 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
1877 | if (r < 0) | |
1878 | return r; | |
1879 | ||
1880 | s->prepare = callback; | |
1881 | ||
1882 | if (callback) { | |
1883 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
1884 | if (r < 0) | |
1885 | return r; | |
1886 | } else | |
1887 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
1888 | ||
1889 | return 0; | |
1890 | } | |
1891 | ||
f7262a9f | 1892 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 1893 | assert_return(s, NULL); |
fd38203a LP |
1894 | |
1895 | return s->userdata; | |
1896 | } | |
1897 | ||
8f726607 LP |
1898 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
1899 | void *ret; | |
1900 | ||
1901 | assert_return(s, NULL); | |
1902 | ||
1903 | ret = s->userdata; | |
1904 | s->userdata = userdata; | |
1905 | ||
1906 | return ret; | |
1907 | } | |
1908 | ||
c2ba3ad6 LP |
1909 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
1910 | usec_t c; | |
1911 | assert(e); | |
1912 | assert(a <= b); | |
1913 | ||
1914 | if (a <= 0) | |
1915 | return 0; | |
393003e1 LP |
1916 | if (a >= USEC_INFINITY) |
1917 | return USEC_INFINITY; | |
c2ba3ad6 LP |
1918 | |
1919 | if (b <= a + 1) | |
1920 | return a; | |
1921 | ||
52444dc4 LP |
1922 | initialize_perturb(e); |
1923 | ||
c2ba3ad6 LP |
1924 | /* |
1925 | Find a good time to wake up again between times a and b. We | |
1926 | have two goals here: | |
1927 | ||
1928 | a) We want to wake up as seldom as possible, hence prefer | |
1929 | later times over earlier times. | |
1930 | ||
1931 | b) But if we have to wake up, then let's make sure to | |
1932 | dispatch as much as possible on the entire system. | |
1933 | ||
1934 | We implement this by waking up everywhere at the same time | |
850516e0 | 1935 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 1936 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
1937 | then we try to find the same spot in every 10s, then 1s and |
1938 | then 250ms step. Otherwise, we pick the last possible time | |
1939 | to wake up. | |
c2ba3ad6 LP |
1940 | */ |
1941 | ||
850516e0 LP |
1942 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
1943 | if (c >= b) { | |
1944 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
1945 | return b; | |
1946 | ||
1947 | c -= USEC_PER_MINUTE; | |
1948 | } | |
1949 | ||
ba276c81 LP |
1950 | if (c >= a) |
1951 | return c; | |
1952 | ||
1953 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
1954 | if (c >= b) { | |
1955 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
1956 | return b; | |
1957 | ||
1958 | c -= USEC_PER_SEC*10; | |
1959 | } | |
1960 | ||
850516e0 LP |
1961 | if (c >= a) |
1962 | return c; | |
1963 | ||
1964 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
1965 | if (c >= b) { |
1966 | if (_unlikely_(c < USEC_PER_SEC)) | |
1967 | return b; | |
1968 | ||
1969 | c -= USEC_PER_SEC; | |
1970 | } | |
1971 | ||
1972 | if (c >= a) | |
1973 | return c; | |
1974 | ||
1975 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
1976 | if (c >= b) { | |
1977 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
1978 | return b; | |
1979 | ||
1980 | c -= USEC_PER_MSEC*250; | |
1981 | } | |
1982 | ||
1983 | if (c >= a) | |
1984 | return c; | |
1985 | ||
1986 | return b; | |
1987 | } | |
1988 | ||
fd38203a LP |
1989 | static int event_arm_timer( |
1990 | sd_event *e, | |
6a0f1f6d | 1991 | struct clock_data *d) { |
fd38203a LP |
1992 | |
1993 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
1994 | sd_event_source *a, *b; |
1995 | usec_t t; | |
fd38203a LP |
1996 | int r; |
1997 | ||
cde93897 | 1998 | assert(e); |
6a0f1f6d | 1999 | assert(d); |
fd38203a | 2000 | |
d06441da | 2001 | if (!d->needs_rearm) |
212bbb17 TG |
2002 | return 0; |
2003 | else | |
2004 | d->needs_rearm = false; | |
2005 | ||
6a0f1f6d | 2006 | a = prioq_peek(d->earliest); |
393003e1 | 2007 | if (!a || a->enabled == SD_EVENT_OFF || a->time.next == USEC_INFINITY) { |
72aedc1e | 2008 | |
6a0f1f6d | 2009 | if (d->fd < 0) |
c57b5ca3 LP |
2010 | return 0; |
2011 | ||
3a43da28 | 2012 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
2013 | return 0; |
2014 | ||
2015 | /* disarm */ | |
6a0f1f6d | 2016 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
2017 | if (r < 0) |
2018 | return r; | |
2019 | ||
3a43da28 | 2020 | d->next = USEC_INFINITY; |
fd38203a | 2021 | return 0; |
72aedc1e | 2022 | } |
fd38203a | 2023 | |
6a0f1f6d | 2024 | b = prioq_peek(d->latest); |
baf76283 | 2025 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 | 2026 | |
1bce0ffa | 2027 | t = sleep_between(e, a->time.next, time_event_source_latest(b)); |
6a0f1f6d | 2028 | if (d->next == t) |
fd38203a LP |
2029 | return 0; |
2030 | ||
6a0f1f6d | 2031 | assert_se(d->fd >= 0); |
fd38203a | 2032 | |
c2ba3ad6 | 2033 | if (t == 0) { |
fd38203a LP |
2034 | /* We don' want to disarm here, just mean some time looooong ago. */ |
2035 | its.it_value.tv_sec = 0; | |
2036 | its.it_value.tv_nsec = 1; | |
2037 | } else | |
c2ba3ad6 | 2038 | timespec_store(&its.it_value, t); |
fd38203a | 2039 | |
6a0f1f6d | 2040 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 2041 | if (r < 0) |
cde93897 | 2042 | return -errno; |
fd38203a | 2043 | |
6a0f1f6d | 2044 | d->next = t; |
fd38203a LP |
2045 | return 0; |
2046 | } | |
2047 | ||
9a800b56 | 2048 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
2049 | assert(e); |
2050 | assert(s); | |
2051 | assert(s->type == SOURCE_IO); | |
2052 | ||
9a800b56 LP |
2053 | /* If the event source was already pending, we just OR in the |
2054 | * new revents, otherwise we reset the value. The ORing is | |
2055 | * necessary to handle EPOLLONESHOT events properly where | |
2056 | * readability might happen independently of writability, and | |
2057 | * we need to keep track of both */ | |
2058 | ||
2059 | if (s->pending) | |
2060 | s->io.revents |= revents; | |
2061 | else | |
2062 | s->io.revents = revents; | |
fd38203a | 2063 | |
fd38203a LP |
2064 | return source_set_pending(s, true); |
2065 | } | |
2066 | ||
72aedc1e | 2067 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2068 | uint64_t x; |
2069 | ssize_t ss; | |
2070 | ||
2071 | assert(e); | |
da7e457c | 2072 | assert(fd >= 0); |
72aedc1e | 2073 | |
305f78bf | 2074 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2075 | |
2076 | ss = read(fd, &x, sizeof(x)); | |
2077 | if (ss < 0) { | |
945c2931 | 2078 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
2079 | return 0; |
2080 | ||
2081 | return -errno; | |
2082 | } | |
2083 | ||
8d35dae7 | 2084 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2085 | return -EIO; |
2086 | ||
cde93897 | 2087 | if (next) |
3a43da28 | 2088 | *next = USEC_INFINITY; |
72aedc1e | 2089 | |
fd38203a LP |
2090 | return 0; |
2091 | } | |
2092 | ||
305f78bf LP |
2093 | static int process_timer( |
2094 | sd_event *e, | |
2095 | usec_t n, | |
6a0f1f6d | 2096 | struct clock_data *d) { |
305f78bf | 2097 | |
fd38203a LP |
2098 | sd_event_source *s; |
2099 | int r; | |
2100 | ||
2101 | assert(e); | |
6a0f1f6d | 2102 | assert(d); |
fd38203a LP |
2103 | |
2104 | for (;;) { | |
6a0f1f6d | 2105 | s = prioq_peek(d->earliest); |
fd38203a LP |
2106 | if (!s || |
2107 | s->time.next > n || | |
baf76283 | 2108 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2109 | s->pending) |
2110 | break; | |
2111 | ||
2112 | r = source_set_pending(s, true); | |
2113 | if (r < 0) | |
2114 | return r; | |
2115 | ||
6a0f1f6d LP |
2116 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2117 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 2118 | d->needs_rearm = true; |
fd38203a LP |
2119 | } |
2120 | ||
2121 | return 0; | |
2122 | } | |
2123 | ||
2124 | static int process_child(sd_event *e) { | |
2125 | sd_event_source *s; | |
2126 | Iterator i; | |
2127 | int r; | |
2128 | ||
2129 | assert(e); | |
2130 | ||
c2ba3ad6 LP |
2131 | e->need_process_child = false; |
2132 | ||
fd38203a LP |
2133 | /* |
2134 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2135 | + WNOHANG for each PID we wait for, instead of using | |
2136 | P_ALL. This is because we only want to get child | |
2137 | information of very specific child processes, and not all | |
2138 | of them. We might not have processed the SIGCHLD even of a | |
2139 | previous invocation and we don't want to maintain a | |
2140 | unbounded *per-child* event queue, hence we really don't | |
2141 | want anything flushed out of the kernel's queue that we | |
2142 | don't care about. Since this is O(n) this means that if you | |
2143 | have a lot of processes you probably want to handle SIGCHLD | |
2144 | yourself. | |
08cd1552 LP |
2145 | |
2146 | We do not reap the children here (by using WNOWAIT), this | |
2147 | is only done after the event source is dispatched so that | |
2148 | the callback still sees the process as a zombie. | |
fd38203a LP |
2149 | */ |
2150 | ||
2151 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2152 | assert(s->type == SOURCE_CHILD); | |
2153 | ||
2154 | if (s->pending) | |
2155 | continue; | |
2156 | ||
baf76283 | 2157 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2158 | continue; |
2159 | ||
2160 | zero(s->child.siginfo); | |
08cd1552 LP |
2161 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2162 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
2163 | if (r < 0) |
2164 | return -errno; | |
2165 | ||
2166 | if (s->child.siginfo.si_pid != 0) { | |
945c2931 | 2167 | bool zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 LP |
2168 | |
2169 | if (!zombie && (s->child.options & WEXITED)) { | |
2170 | /* If the child isn't dead then let's | |
2171 | * immediately remove the state change | |
2172 | * from the queue, since there's no | |
2173 | * benefit in leaving it queued */ | |
2174 | ||
2175 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2176 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2177 | } | |
2178 | ||
fd38203a LP |
2179 | r = source_set_pending(s, true); |
2180 | if (r < 0) | |
2181 | return r; | |
2182 | } | |
2183 | } | |
2184 | ||
fd38203a LP |
2185 | return 0; |
2186 | } | |
2187 | ||
9da4cb2b | 2188 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2189 | bool read_one = false; |
fd38203a LP |
2190 | int r; |
2191 | ||
da7e457c | 2192 | assert(e); |
305f78bf | 2193 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2194 | |
9da4cb2b LP |
2195 | /* If there's a signal queued on this priority and SIGCHLD is |
2196 | on this priority too, then make sure to recheck the | |
2197 | children we watch. This is because we only ever dequeue | |
2198 | the first signal per priority, and if we dequeue one, and | |
2199 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2200 | might have higher priority children we care about hence we | |
2201 | need to check that explicitly. */ | |
2202 | ||
2203 | if (sigismember(&d->sigset, SIGCHLD)) | |
2204 | e->need_process_child = true; | |
2205 | ||
2206 | /* If there's already an event source pending for this | |
2207 | * priority we don't read another */ | |
2208 | if (d->current) | |
2209 | return 0; | |
2210 | ||
fd38203a | 2211 | for (;;) { |
0eb2e0e3 | 2212 | struct signalfd_siginfo si; |
7057bd99 | 2213 | ssize_t n; |
92daebc0 | 2214 | sd_event_source *s = NULL; |
fd38203a | 2215 | |
9da4cb2b | 2216 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 2217 | if (n < 0) { |
945c2931 | 2218 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
2219 | return read_one; |
2220 | ||
2221 | return -errno; | |
2222 | } | |
2223 | ||
7057bd99 | 2224 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2225 | return -EIO; |
2226 | ||
6eb7c172 | 2227 | assert(SIGNAL_VALID(si.ssi_signo)); |
7057bd99 | 2228 | |
fd38203a LP |
2229 | read_one = true; |
2230 | ||
92daebc0 LP |
2231 | if (e->signal_sources) |
2232 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
2233 | if (!s) |
2234 | continue; | |
9da4cb2b LP |
2235 | if (s->pending) |
2236 | continue; | |
fd38203a LP |
2237 | |
2238 | s->signal.siginfo = si; | |
9da4cb2b LP |
2239 | d->current = s; |
2240 | ||
fd38203a LP |
2241 | r = source_set_pending(s, true); |
2242 | if (r < 0) | |
2243 | return r; | |
9da4cb2b LP |
2244 | |
2245 | return 1; | |
fd38203a | 2246 | } |
fd38203a LP |
2247 | } |
2248 | ||
2249 | static int source_dispatch(sd_event_source *s) { | |
8f5c235d | 2250 | EventSourceType saved_type; |
fe8245eb | 2251 | int r = 0; |
fd38203a LP |
2252 | |
2253 | assert(s); | |
6203e07a | 2254 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2255 | |
8f5c235d LP |
2256 | /* Save the event source type, here, so that we still know it after the event callback which might invalidate |
2257 | * the event. */ | |
2258 | saved_type = s->type; | |
2259 | ||
945c2931 | 2260 | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { |
da7e457c LP |
2261 | r = source_set_pending(s, false); |
2262 | if (r < 0) | |
2263 | return r; | |
2264 | } | |
fd38203a | 2265 | |
6e9feda3 LP |
2266 | if (s->type != SOURCE_POST) { |
2267 | sd_event_source *z; | |
2268 | Iterator i; | |
2269 | ||
2270 | /* If we execute a non-post source, let's mark all | |
2271 | * post sources as pending */ | |
2272 | ||
2273 | SET_FOREACH(z, s->event->post_sources, i) { | |
2274 | if (z->enabled == SD_EVENT_OFF) | |
2275 | continue; | |
2276 | ||
2277 | r = source_set_pending(z, true); | |
2278 | if (r < 0) | |
2279 | return r; | |
2280 | } | |
2281 | } | |
2282 | ||
baf76283 LP |
2283 | if (s->enabled == SD_EVENT_ONESHOT) { |
2284 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2285 | if (r < 0) |
2286 | return r; | |
2287 | } | |
2288 | ||
12179984 | 2289 | s->dispatching = true; |
b7484e2a | 2290 | |
fd38203a LP |
2291 | switch (s->type) { |
2292 | ||
2293 | case SOURCE_IO: | |
2294 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2295 | break; | |
2296 | ||
6a0f1f6d | 2297 | case SOURCE_TIME_REALTIME: |
a8548816 | 2298 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2299 | case SOURCE_TIME_MONOTONIC: |
2300 | case SOURCE_TIME_REALTIME_ALARM: | |
2301 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2302 | r = s->time.callback(s, s->time.next, s->userdata); |
2303 | break; | |
2304 | ||
2305 | case SOURCE_SIGNAL: | |
2306 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2307 | break; | |
2308 | ||
08cd1552 LP |
2309 | case SOURCE_CHILD: { |
2310 | bool zombie; | |
2311 | ||
945c2931 | 2312 | zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 | 2313 | |
fd38203a | 2314 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2315 | |
2316 | /* Now, reap the PID for good. */ | |
2317 | if (zombie) | |
2318 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); | |
2319 | ||
fd38203a | 2320 | break; |
08cd1552 | 2321 | } |
fd38203a LP |
2322 | |
2323 | case SOURCE_DEFER: | |
2324 | r = s->defer.callback(s, s->userdata); | |
2325 | break; | |
da7e457c | 2326 | |
6e9feda3 LP |
2327 | case SOURCE_POST: |
2328 | r = s->post.callback(s, s->userdata); | |
2329 | break; | |
2330 | ||
6203e07a LP |
2331 | case SOURCE_EXIT: |
2332 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2333 | break; |
9d3e3aa5 LP |
2334 | |
2335 | case SOURCE_WATCHDOG: | |
a71fe8b8 | 2336 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2337 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2338 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2339 | } |
2340 | ||
12179984 LP |
2341 | s->dispatching = false; |
2342 | ||
55cbfaa5 DM |
2343 | if (r < 0) |
2344 | log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m", | |
8f5c235d | 2345 | strna(s->description), event_source_type_to_string(saved_type)); |
12179984 LP |
2346 | |
2347 | if (s->n_ref == 0) | |
2348 | source_free(s); | |
2349 | else if (r < 0) | |
6203e07a | 2350 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2351 | |
6203e07a | 2352 | return 1; |
fd38203a LP |
2353 | } |
2354 | ||
2355 | static int event_prepare(sd_event *e) { | |
2356 | int r; | |
2357 | ||
2358 | assert(e); | |
2359 | ||
2360 | for (;;) { | |
2361 | sd_event_source *s; | |
2362 | ||
2363 | s = prioq_peek(e->prepare); | |
baf76283 | 2364 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2365 | break; |
2366 | ||
2367 | s->prepare_iteration = e->iteration; | |
2368 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2369 | if (r < 0) | |
2370 | return r; | |
2371 | ||
2372 | assert(s->prepare); | |
12179984 LP |
2373 | |
2374 | s->dispatching = true; | |
fd38203a | 2375 | r = s->prepare(s, s->userdata); |
12179984 LP |
2376 | s->dispatching = false; |
2377 | ||
55cbfaa5 DM |
2378 | if (r < 0) |
2379 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m", | |
2380 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a | 2381 | |
12179984 LP |
2382 | if (s->n_ref == 0) |
2383 | source_free(s); | |
2384 | else if (r < 0) | |
2385 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2386 | } |
2387 | ||
2388 | return 0; | |
2389 | } | |
2390 | ||
6203e07a | 2391 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
2392 | sd_event_source *p; |
2393 | int r; | |
2394 | ||
2395 | assert(e); | |
2396 | ||
6203e07a | 2397 | p = prioq_peek(e->exit); |
baf76283 | 2398 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2399 | e->state = SD_EVENT_FINISHED; |
2400 | return 0; | |
2401 | } | |
2402 | ||
2403 | sd_event_ref(e); | |
2404 | e->iteration++; | |
6203e07a | 2405 | e->state = SD_EVENT_EXITING; |
da7e457c LP |
2406 | |
2407 | r = source_dispatch(p); | |
2408 | ||
2b0c9ef7 | 2409 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2410 | sd_event_unref(e); |
2411 | ||
2412 | return r; | |
2413 | } | |
2414 | ||
c2ba3ad6 LP |
2415 | static sd_event_source* event_next_pending(sd_event *e) { |
2416 | sd_event_source *p; | |
2417 | ||
da7e457c LP |
2418 | assert(e); |
2419 | ||
c2ba3ad6 LP |
2420 | p = prioq_peek(e->pending); |
2421 | if (!p) | |
2422 | return NULL; | |
2423 | ||
baf76283 | 2424 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2425 | return NULL; |
2426 | ||
2427 | return p; | |
2428 | } | |
2429 | ||
cde93897 LP |
2430 | static int arm_watchdog(sd_event *e) { |
2431 | struct itimerspec its = {}; | |
2432 | usec_t t; | |
2433 | int r; | |
2434 | ||
2435 | assert(e); | |
2436 | assert(e->watchdog_fd >= 0); | |
2437 | ||
2438 | t = sleep_between(e, | |
2439 | e->watchdog_last + (e->watchdog_period / 2), | |
2440 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2441 | ||
2442 | timespec_store(&its.it_value, t); | |
2443 | ||
75145780 LP |
2444 | /* Make sure we never set the watchdog to 0, which tells the |
2445 | * kernel to disable it. */ | |
2446 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2447 | its.it_value.tv_nsec = 1; | |
2448 | ||
cde93897 LP |
2449 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2450 | if (r < 0) | |
2451 | return -errno; | |
2452 | ||
2453 | return 0; | |
2454 | } | |
2455 | ||
2456 | static int process_watchdog(sd_event *e) { | |
2457 | assert(e); | |
2458 | ||
2459 | if (!e->watchdog) | |
2460 | return 0; | |
2461 | ||
2462 | /* Don't notify watchdog too often */ | |
2463 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
2464 | return 0; | |
2465 | ||
2466 | sd_notify(false, "WATCHDOG=1"); | |
2467 | e->watchdog_last = e->timestamp.monotonic; | |
2468 | ||
2469 | return arm_watchdog(e); | |
2470 | } | |
2471 | ||
c45a5a74 TG |
2472 | _public_ int sd_event_prepare(sd_event *e) { |
2473 | int r; | |
fd38203a | 2474 | |
da7e457c | 2475 | assert_return(e, -EINVAL); |
b937d761 | 2476 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
2477 | assert_return(!event_pid_changed(e), -ECHILD); |
2478 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2479 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 2480 | |
6203e07a | 2481 | if (e->exit_requested) |
c45a5a74 | 2482 | goto pending; |
fd38203a LP |
2483 | |
2484 | e->iteration++; | |
2485 | ||
0be6c2f6 | 2486 | e->state = SD_EVENT_PREPARING; |
fd38203a | 2487 | r = event_prepare(e); |
0be6c2f6 | 2488 | e->state = SD_EVENT_INITIAL; |
fd38203a | 2489 | if (r < 0) |
c45a5a74 | 2490 | return r; |
fd38203a | 2491 | |
6a0f1f6d LP |
2492 | r = event_arm_timer(e, &e->realtime); |
2493 | if (r < 0) | |
c45a5a74 | 2494 | return r; |
6a0f1f6d | 2495 | |
a8548816 TG |
2496 | r = event_arm_timer(e, &e->boottime); |
2497 | if (r < 0) | |
c45a5a74 | 2498 | return r; |
a8548816 | 2499 | |
6a0f1f6d LP |
2500 | r = event_arm_timer(e, &e->monotonic); |
2501 | if (r < 0) | |
c45a5a74 | 2502 | return r; |
6a0f1f6d LP |
2503 | |
2504 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 2505 | if (r < 0) |
c45a5a74 | 2506 | return r; |
fd38203a | 2507 | |
6a0f1f6d | 2508 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 2509 | if (r < 0) |
c45a5a74 | 2510 | return r; |
fd38203a | 2511 | |
1b5995b0 | 2512 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
2513 | goto pending; |
2514 | ||
2b0c9ef7 | 2515 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
2516 | |
2517 | return 0; | |
2518 | ||
2519 | pending: | |
2b0c9ef7 | 2520 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2521 | r = sd_event_wait(e, 0); |
2522 | if (r == 0) | |
2b0c9ef7 | 2523 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
2524 | |
2525 | return r; | |
c45a5a74 TG |
2526 | } |
2527 | ||
2528 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
2529 | struct epoll_event *ev_queue; | |
2530 | unsigned ev_queue_max; | |
2531 | int r, m, i; | |
2532 | ||
2533 | assert_return(e, -EINVAL); | |
b937d761 | 2534 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
2535 | assert_return(!event_pid_changed(e), -ECHILD); |
2536 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2537 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
2538 | |
2539 | if (e->exit_requested) { | |
2540 | e->state = SD_EVENT_PENDING; | |
2541 | return 1; | |
2542 | } | |
6a0f1f6d | 2543 | |
1c724e9e | 2544 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 2545 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 2546 | |
15b38f93 | 2547 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
c2ba3ad6 | 2548 | timeout == (uint64_t) -1 ? -1 : (int) ((timeout + USEC_PER_MSEC - 1) / USEC_PER_MSEC)); |
da7e457c | 2549 | if (m < 0) { |
c45a5a74 TG |
2550 | if (errno == EINTR) { |
2551 | e->state = SD_EVENT_PENDING; | |
2552 | return 1; | |
2553 | } | |
2554 | ||
2555 | r = -errno; | |
da7e457c LP |
2556 | goto finish; |
2557 | } | |
fd38203a | 2558 | |
e475d10c | 2559 | triple_timestamp_get(&e->timestamp); |
fd38203a LP |
2560 | |
2561 | for (i = 0; i < m; i++) { | |
2562 | ||
9da4cb2b | 2563 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 2564 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
9da4cb2b LP |
2565 | else { |
2566 | WakeupType *t = ev_queue[i].data.ptr; | |
2567 | ||
2568 | switch (*t) { | |
2569 | ||
2570 | case WAKEUP_EVENT_SOURCE: | |
2571 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2572 | break; | |
fd38203a | 2573 | |
9da4cb2b LP |
2574 | case WAKEUP_CLOCK_DATA: { |
2575 | struct clock_data *d = ev_queue[i].data.ptr; | |
2576 | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); | |
2577 | break; | |
2578 | } | |
2579 | ||
2580 | case WAKEUP_SIGNAL_DATA: | |
2581 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
2582 | break; | |
2583 | ||
2584 | default: | |
2585 | assert_not_reached("Invalid wake-up pointer"); | |
2586 | } | |
2587 | } | |
fd38203a | 2588 | if (r < 0) |
da7e457c | 2589 | goto finish; |
fd38203a LP |
2590 | } |
2591 | ||
cde93897 LP |
2592 | r = process_watchdog(e); |
2593 | if (r < 0) | |
2594 | goto finish; | |
2595 | ||
6a0f1f6d LP |
2596 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
2597 | if (r < 0) | |
2598 | goto finish; | |
2599 | ||
e475d10c | 2600 | r = process_timer(e, e->timestamp.boottime, &e->boottime); |
a8548816 TG |
2601 | if (r < 0) |
2602 | goto finish; | |
2603 | ||
6a0f1f6d LP |
2604 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
2605 | if (r < 0) | |
2606 | goto finish; | |
2607 | ||
2608 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 2609 | if (r < 0) |
da7e457c | 2610 | goto finish; |
fd38203a | 2611 | |
e475d10c | 2612 | r = process_timer(e, e->timestamp.boottime, &e->boottime_alarm); |
fd38203a | 2613 | if (r < 0) |
da7e457c | 2614 | goto finish; |
fd38203a | 2615 | |
c2ba3ad6 | 2616 | if (e->need_process_child) { |
fd38203a LP |
2617 | r = process_child(e); |
2618 | if (r < 0) | |
da7e457c | 2619 | goto finish; |
fd38203a LP |
2620 | } |
2621 | ||
c45a5a74 TG |
2622 | if (event_next_pending(e)) { |
2623 | e->state = SD_EVENT_PENDING; | |
2624 | ||
2625 | return 1; | |
da7e457c LP |
2626 | } |
2627 | ||
c45a5a74 | 2628 | r = 0; |
fd38203a | 2629 | |
da7e457c | 2630 | finish: |
2b0c9ef7 | 2631 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2632 | |
2633 | return r; | |
fd38203a LP |
2634 | } |
2635 | ||
c45a5a74 TG |
2636 | _public_ int sd_event_dispatch(sd_event *e) { |
2637 | sd_event_source *p; | |
2638 | int r; | |
2639 | ||
2640 | assert_return(e, -EINVAL); | |
b937d761 | 2641 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
2642 | assert_return(!event_pid_changed(e), -ECHILD); |
2643 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2644 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
2645 | ||
2646 | if (e->exit_requested) | |
2647 | return dispatch_exit(e); | |
2648 | ||
2649 | p = event_next_pending(e); | |
2650 | if (p) { | |
2651 | sd_event_ref(e); | |
2652 | ||
2653 | e->state = SD_EVENT_RUNNING; | |
2654 | r = source_dispatch(p); | |
2b0c9ef7 | 2655 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2656 | |
2657 | sd_event_unref(e); | |
2658 | ||
2659 | return r; | |
2660 | } | |
2661 | ||
2b0c9ef7 | 2662 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
2663 | |
2664 | return 1; | |
2665 | } | |
2666 | ||
34b87517 VC |
2667 | static void event_log_delays(sd_event *e) { |
2668 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1]; | |
34a6843d VC |
2669 | unsigned i; |
2670 | int o; | |
34b87517 VC |
2671 | |
2672 | for (i = o = 0; i < ELEMENTSOF(e->delays); i++) { | |
2673 | o += snprintf(&b[o], sizeof(b) - o, "%u ", e->delays[i]); | |
2674 | e->delays[i] = 0; | |
2675 | } | |
34a6843d | 2676 | log_debug("Event loop iterations: %.*s", o, b); |
34b87517 VC |
2677 | } |
2678 | ||
c45a5a74 TG |
2679 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
2680 | int r; | |
2681 | ||
2682 | assert_return(e, -EINVAL); | |
b937d761 | 2683 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
2684 | assert_return(!event_pid_changed(e), -ECHILD); |
2685 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 2686 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 | 2687 | |
34b87517 VC |
2688 | if (e->profile_delays && e->last_run) { |
2689 | usec_t this_run; | |
2690 | unsigned l; | |
2691 | ||
2692 | this_run = now(CLOCK_MONOTONIC); | |
2693 | ||
2694 | l = u64log2(this_run - e->last_run); | |
2695 | assert(l < sizeof(e->delays)); | |
2696 | e->delays[l]++; | |
2697 | ||
2698 | if (this_run - e->last_log >= 5*USEC_PER_SEC) { | |
2699 | event_log_delays(e); | |
2700 | e->last_log = this_run; | |
2701 | } | |
2702 | } | |
2703 | ||
c45a5a74 | 2704 | r = sd_event_prepare(e); |
53bac4e0 LP |
2705 | if (r == 0) |
2706 | /* There was nothing? Then wait... */ | |
2707 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 2708 | |
34b87517 VC |
2709 | if (e->profile_delays) |
2710 | e->last_run = now(CLOCK_MONOTONIC); | |
2711 | ||
02d30981 | 2712 | if (r > 0) { |
53bac4e0 | 2713 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
2714 | r = sd_event_dispatch(e); |
2715 | if (r < 0) | |
2716 | return r; | |
53bac4e0 LP |
2717 | |
2718 | return 1; | |
2719 | } | |
2720 | ||
2721 | return r; | |
c45a5a74 TG |
2722 | } |
2723 | ||
f7262a9f | 2724 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
2725 | int r; |
2726 | ||
da7e457c | 2727 | assert_return(e, -EINVAL); |
b937d761 | 2728 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c | 2729 | assert_return(!event_pid_changed(e), -ECHILD); |
2b0c9ef7 | 2730 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c LP |
2731 | |
2732 | sd_event_ref(e); | |
fd38203a | 2733 | |
da7e457c | 2734 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
2735 | r = sd_event_run(e, (uint64_t) -1); |
2736 | if (r < 0) | |
da7e457c | 2737 | goto finish; |
fd38203a LP |
2738 | } |
2739 | ||
6203e07a | 2740 | r = e->exit_code; |
da7e457c LP |
2741 | |
2742 | finish: | |
2743 | sd_event_unref(e); | |
2744 | return r; | |
fd38203a LP |
2745 | } |
2746 | ||
9b364545 TG |
2747 | _public_ int sd_event_get_fd(sd_event *e) { |
2748 | ||
2749 | assert_return(e, -EINVAL); | |
b937d761 | 2750 | assert_return(e = event_resolve(e), -ENOPKG); |
9b364545 TG |
2751 | assert_return(!event_pid_changed(e), -ECHILD); |
2752 | ||
2753 | return e->epoll_fd; | |
2754 | } | |
2755 | ||
f7262a9f | 2756 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c | 2757 | assert_return(e, -EINVAL); |
b937d761 | 2758 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
2759 | assert_return(!event_pid_changed(e), -ECHILD); |
2760 | ||
2761 | return e->state; | |
2762 | } | |
2763 | ||
6203e07a | 2764 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 2765 | assert_return(e, -EINVAL); |
b937d761 | 2766 | assert_return(e = event_resolve(e), -ENOPKG); |
6203e07a | 2767 | assert_return(code, -EINVAL); |
da7e457c | 2768 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 2769 | |
6203e07a LP |
2770 | if (!e->exit_requested) |
2771 | return -ENODATA; | |
2772 | ||
2773 | *code = e->exit_code; | |
2774 | return 0; | |
fd38203a LP |
2775 | } |
2776 | ||
6203e07a | 2777 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c | 2778 | assert_return(e, -EINVAL); |
b937d761 | 2779 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
2780 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
2781 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 2782 | |
6203e07a LP |
2783 | e->exit_requested = true; |
2784 | e->exit_code = code; | |
2785 | ||
fd38203a LP |
2786 | return 0; |
2787 | } | |
46e8c825 | 2788 | |
6a0f1f6d | 2789 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 | 2790 | assert_return(e, -EINVAL); |
b937d761 | 2791 | assert_return(e = event_resolve(e), -ENOPKG); |
46e8c825 | 2792 | assert_return(usec, -EINVAL); |
46e8c825 LP |
2793 | assert_return(!event_pid_changed(e), -ECHILD); |
2794 | ||
e475d10c LP |
2795 | if (!TRIPLE_TIMESTAMP_HAS_CLOCK(clock)) |
2796 | return -EOPNOTSUPP; | |
2797 | ||
2798 | /* Generate a clean error in case CLOCK_BOOTTIME is not available. Note that don't use clock_supported() here, | |
2799 | * for a reason: there are systems where CLOCK_BOOTTIME is supported, but CLOCK_BOOTTIME_ALARM is not, but for | |
2800 | * the purpose of getting the time this doesn't matter. */ | |
3411372e LP |
2801 | if (IN_SET(clock, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM) && !clock_boottime_supported()) |
2802 | return -EOPNOTSUPP; | |
2803 | ||
e475d10c | 2804 | if (!triple_timestamp_is_set(&e->timestamp)) { |
38a03f06 LP |
2805 | /* Implicitly fall back to now() if we never ran |
2806 | * before and thus have no cached time. */ | |
2807 | *usec = now(clock); | |
2808 | return 1; | |
2809 | } | |
46e8c825 | 2810 | |
e475d10c | 2811 | *usec = triple_timestamp_by_clock(&e->timestamp, clock); |
46e8c825 LP |
2812 | return 0; |
2813 | } | |
afc6adb5 LP |
2814 | |
2815 | _public_ int sd_event_default(sd_event **ret) { | |
39883f62 | 2816 | sd_event *e = NULL; |
afc6adb5 LP |
2817 | int r; |
2818 | ||
2819 | if (!ret) | |
2820 | return !!default_event; | |
2821 | ||
2822 | if (default_event) { | |
2823 | *ret = sd_event_ref(default_event); | |
2824 | return 0; | |
2825 | } | |
2826 | ||
2827 | r = sd_event_new(&e); | |
2828 | if (r < 0) | |
2829 | return r; | |
2830 | ||
2831 | e->default_event_ptr = &default_event; | |
2832 | e->tid = gettid(); | |
2833 | default_event = e; | |
2834 | ||
2835 | *ret = e; | |
2836 | return 1; | |
2837 | } | |
2838 | ||
2839 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
2840 | assert_return(e, -EINVAL); | |
b937d761 | 2841 | assert_return(e = event_resolve(e), -ENOPKG); |
afc6adb5 | 2842 | assert_return(tid, -EINVAL); |
76b54375 | 2843 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 2844 | |
76b54375 LP |
2845 | if (e->tid != 0) { |
2846 | *tid = e->tid; | |
2847 | return 0; | |
2848 | } | |
2849 | ||
2850 | return -ENXIO; | |
afc6adb5 | 2851 | } |
cde93897 LP |
2852 | |
2853 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
2854 | int r; | |
2855 | ||
2856 | assert_return(e, -EINVAL); | |
b937d761 | 2857 | assert_return(e = event_resolve(e), -ENOPKG); |
8f726607 | 2858 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
2859 | |
2860 | if (e->watchdog == !!b) | |
2861 | return e->watchdog; | |
2862 | ||
2863 | if (b) { | |
2864 | struct epoll_event ev = {}; | |
cde93897 | 2865 | |
09812eb7 LP |
2866 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
2867 | if (r <= 0) | |
cde93897 | 2868 | return r; |
cde93897 LP |
2869 | |
2870 | /* Issue first ping immediately */ | |
2871 | sd_notify(false, "WATCHDOG=1"); | |
2872 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
2873 | ||
2874 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
2875 | if (e->watchdog_fd < 0) | |
2876 | return -errno; | |
2877 | ||
2878 | r = arm_watchdog(e); | |
2879 | if (r < 0) | |
2880 | goto fail; | |
2881 | ||
2882 | ev.events = EPOLLIN; | |
2883 | ev.data.ptr = INT_TO_PTR(SOURCE_WATCHDOG); | |
2884 | ||
2885 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
2886 | if (r < 0) { | |
2887 | r = -errno; | |
2888 | goto fail; | |
2889 | } | |
2890 | ||
2891 | } else { | |
2892 | if (e->watchdog_fd >= 0) { | |
2893 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 2894 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2895 | } |
2896 | } | |
2897 | ||
2898 | e->watchdog = !!b; | |
2899 | return e->watchdog; | |
2900 | ||
2901 | fail: | |
03e334a1 | 2902 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
2903 | return r; |
2904 | } | |
8f726607 LP |
2905 | |
2906 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
2907 | assert_return(e, -EINVAL); | |
b937d761 | 2908 | assert_return(e = event_resolve(e), -ENOPKG); |
8f726607 LP |
2909 | assert_return(!event_pid_changed(e), -ECHILD); |
2910 | ||
2911 | return e->watchdog; | |
2912 | } | |
60a3b1e1 LP |
2913 | |
2914 | _public_ int sd_event_get_iteration(sd_event *e, uint64_t *ret) { | |
2915 | assert_return(e, -EINVAL); | |
b937d761 | 2916 | assert_return(e = event_resolve(e), -ENOPKG); |
60a3b1e1 LP |
2917 | assert_return(!event_pid_changed(e), -ECHILD); |
2918 | ||
2919 | *ret = e->iteration; | |
2920 | return 0; | |
2921 | } |