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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
fd38203a LP |
2 | |
3 | #include <sys/epoll.h> | |
4 | #include <sys/timerfd.h> | |
5 | #include <sys/wait.h> | |
6 | ||
cde93897 | 7 | #include "sd-daemon.h" |
07630cea LP |
8 | #include "sd-event.h" |
9 | #include "sd-id128.h" | |
10 | ||
b5efdb8a | 11 | #include "alloc-util.h" |
a137a1c3 | 12 | #include "event-source.h" |
3ffd4af2 | 13 | #include "fd-util.h" |
97ef5391 | 14 | #include "fs-util.h" |
fd38203a | 15 | #include "hashmap.h" |
07630cea LP |
16 | #include "list.h" |
17 | #include "macro.h" | |
0a970718 | 18 | #include "memory-util.h" |
afc6adb5 | 19 | #include "missing.h" |
07630cea | 20 | #include "prioq.h" |
4a0b58c4 | 21 | #include "process-util.h" |
6e9feda3 | 22 | #include "set.h" |
24882e06 | 23 | #include "signal-util.h" |
55cbfaa5 | 24 | #include "string-table.h" |
07630cea LP |
25 | #include "string-util.h" |
26 | #include "time-util.h" | |
fd38203a | 27 | |
c2ba3ad6 | 28 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a | 29 | |
55cbfaa5 DM |
30 | static const char* const event_source_type_table[_SOURCE_EVENT_SOURCE_TYPE_MAX] = { |
31 | [SOURCE_IO] = "io", | |
32 | [SOURCE_TIME_REALTIME] = "realtime", | |
33 | [SOURCE_TIME_BOOTTIME] = "bootime", | |
34 | [SOURCE_TIME_MONOTONIC] = "monotonic", | |
35 | [SOURCE_TIME_REALTIME_ALARM] = "realtime-alarm", | |
36 | [SOURCE_TIME_BOOTTIME_ALARM] = "boottime-alarm", | |
37 | [SOURCE_SIGNAL] = "signal", | |
38 | [SOURCE_CHILD] = "child", | |
39 | [SOURCE_DEFER] = "defer", | |
40 | [SOURCE_POST] = "post", | |
41 | [SOURCE_EXIT] = "exit", | |
42 | [SOURCE_WATCHDOG] = "watchdog", | |
97ef5391 | 43 | [SOURCE_INOTIFY] = "inotify", |
55cbfaa5 DM |
44 | }; |
45 | ||
46 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(event_source_type, int); | |
47 | ||
a8548816 | 48 | #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 | 49 | |
fd38203a | 50 | struct sd_event { |
da7e457c | 51 | unsigned n_ref; |
fd38203a LP |
52 | |
53 | int epoll_fd; | |
cde93897 | 54 | int watchdog_fd; |
fd38203a LP |
55 | |
56 | Prioq *pending; | |
57 | Prioq *prepare; | |
c2ba3ad6 | 58 | |
a8548816 | 59 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
60 | * can add support for more clocks when the kernel learns to |
61 | * deal with them, too. */ | |
62 | struct clock_data realtime; | |
a8548816 | 63 | struct clock_data boottime; |
6a0f1f6d LP |
64 | struct clock_data monotonic; |
65 | struct clock_data realtime_alarm; | |
66 | struct clock_data boottime_alarm; | |
fd38203a | 67 | |
da7e457c LP |
68 | usec_t perturb; |
69 | ||
9da4cb2b LP |
70 | sd_event_source **signal_sources; /* indexed by signal number */ |
71 | Hashmap *signal_data; /* indexed by priority */ | |
fd38203a LP |
72 | |
73 | Hashmap *child_sources; | |
baf76283 | 74 | unsigned n_enabled_child_sources; |
fd38203a | 75 | |
6e9feda3 LP |
76 | Set *post_sources; |
77 | ||
6203e07a | 78 | Prioq *exit; |
fd38203a | 79 | |
97ef5391 LP |
80 | Hashmap *inotify_data; /* indexed by priority */ |
81 | ||
82 | /* A list of inode structures that still have an fd open, that we need to close before the next loop iteration */ | |
83 | LIST_HEAD(struct inode_data, inode_data_to_close); | |
84 | ||
85 | /* A list of inotify objects that already have events buffered which aren't processed yet */ | |
86 | LIST_HEAD(struct inotify_data, inotify_data_buffered); | |
87 | ||
da7e457c | 88 | pid_t original_pid; |
c2ba3ad6 | 89 | |
60a3b1e1 | 90 | uint64_t iteration; |
e475d10c | 91 | triple_timestamp timestamp; |
da7e457c | 92 | int state; |
eaa3cbef | 93 | |
6203e07a | 94 | bool exit_requested:1; |
da7e457c | 95 | bool need_process_child:1; |
cde93897 | 96 | bool watchdog:1; |
34b87517 | 97 | bool profile_delays:1; |
afc6adb5 | 98 | |
6203e07a LP |
99 | int exit_code; |
100 | ||
afc6adb5 LP |
101 | pid_t tid; |
102 | sd_event **default_event_ptr; | |
cde93897 LP |
103 | |
104 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
105 | |
106 | unsigned n_sources; | |
a71fe8b8 LP |
107 | |
108 | LIST_HEAD(sd_event_source, sources); | |
34b87517 VC |
109 | |
110 | usec_t last_run, last_log; | |
111 | unsigned delays[sizeof(usec_t) * 8]; | |
fd38203a LP |
112 | }; |
113 | ||
b937d761 NM |
114 | static thread_local sd_event *default_event = NULL; |
115 | ||
a71fe8b8 | 116 | static void source_disconnect(sd_event_source *s); |
97ef5391 | 117 | static void event_gc_inode_data(sd_event *e, struct inode_data *d); |
a71fe8b8 | 118 | |
b937d761 NM |
119 | static sd_event *event_resolve(sd_event *e) { |
120 | return e == SD_EVENT_DEFAULT ? default_event : e; | |
121 | } | |
122 | ||
fd38203a LP |
123 | static int pending_prioq_compare(const void *a, const void *b) { |
124 | const sd_event_source *x = a, *y = b; | |
9c57a73b | 125 | int r; |
fd38203a LP |
126 | |
127 | assert(x->pending); | |
128 | assert(y->pending); | |
129 | ||
baf76283 LP |
130 | /* Enabled ones first */ |
131 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 132 | return -1; |
baf76283 | 133 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
134 | return 1; |
135 | ||
136 | /* Lower priority values first */ | |
9c57a73b YW |
137 | r = CMP(x->priority, y->priority); |
138 | if (r != 0) | |
139 | return r; | |
fd38203a LP |
140 | |
141 | /* Older entries first */ | |
9c57a73b | 142 | return CMP(x->pending_iteration, y->pending_iteration); |
fd38203a LP |
143 | } |
144 | ||
145 | static int prepare_prioq_compare(const void *a, const void *b) { | |
146 | const sd_event_source *x = a, *y = b; | |
9c57a73b | 147 | int r; |
fd38203a LP |
148 | |
149 | assert(x->prepare); | |
150 | assert(y->prepare); | |
151 | ||
8046c457 KK |
152 | /* Enabled ones first */ |
153 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
154 | return -1; | |
155 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
156 | return 1; | |
157 | ||
fd38203a LP |
158 | /* Move most recently prepared ones last, so that we can stop |
159 | * preparing as soon as we hit one that has already been | |
160 | * prepared in the current iteration */ | |
9c57a73b YW |
161 | r = CMP(x->prepare_iteration, y->prepare_iteration); |
162 | if (r != 0) | |
163 | return r; | |
fd38203a | 164 | |
fd38203a | 165 | /* Lower priority values first */ |
9c57a73b | 166 | return CMP(x->priority, y->priority); |
fd38203a LP |
167 | } |
168 | ||
c2ba3ad6 | 169 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
170 | const sd_event_source *x = a, *y = b; |
171 | ||
6a0f1f6d LP |
172 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
173 | assert(x->type == y->type); | |
fd38203a | 174 | |
baf76283 LP |
175 | /* Enabled ones first */ |
176 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 177 | return -1; |
baf76283 | 178 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
179 | return 1; |
180 | ||
181 | /* Move the pending ones to the end */ | |
182 | if (!x->pending && y->pending) | |
183 | return -1; | |
184 | if (x->pending && !y->pending) | |
185 | return 1; | |
186 | ||
187 | /* Order by time */ | |
9c57a73b | 188 | return CMP(x->time.next, y->time.next); |
fd38203a LP |
189 | } |
190 | ||
1bce0ffa LP |
191 | static usec_t time_event_source_latest(const sd_event_source *s) { |
192 | return usec_add(s->time.next, s->time.accuracy); | |
193 | } | |
194 | ||
c2ba3ad6 LP |
195 | static int latest_time_prioq_compare(const void *a, const void *b) { |
196 | const sd_event_source *x = a, *y = b; | |
197 | ||
6a0f1f6d LP |
198 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
199 | assert(x->type == y->type); | |
c2ba3ad6 | 200 | |
baf76283 LP |
201 | /* Enabled ones first */ |
202 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 203 | return -1; |
baf76283 | 204 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
205 | return 1; |
206 | ||
207 | /* Move the pending ones to the end */ | |
208 | if (!x->pending && y->pending) | |
209 | return -1; | |
210 | if (x->pending && !y->pending) | |
211 | return 1; | |
212 | ||
213 | /* Order by time */ | |
9c57a73b | 214 | return CMP(time_event_source_latest(x), time_event_source_latest(y)); |
c2ba3ad6 LP |
215 | } |
216 | ||
6203e07a | 217 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
218 | const sd_event_source *x = a, *y = b; |
219 | ||
6203e07a LP |
220 | assert(x->type == SOURCE_EXIT); |
221 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 222 | |
baf76283 LP |
223 | /* Enabled ones first */ |
224 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 225 | return -1; |
baf76283 | 226 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
227 | return 1; |
228 | ||
229 | /* Lower priority values first */ | |
6dd91b36 | 230 | return CMP(x->priority, y->priority); |
da7e457c LP |
231 | } |
232 | ||
6a0f1f6d LP |
233 | static void free_clock_data(struct clock_data *d) { |
234 | assert(d); | |
9da4cb2b | 235 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
236 | |
237 | safe_close(d->fd); | |
238 | prioq_free(d->earliest); | |
239 | prioq_free(d->latest); | |
240 | } | |
241 | ||
8301aa0b | 242 | static sd_event *event_free(sd_event *e) { |
a71fe8b8 LP |
243 | sd_event_source *s; |
244 | ||
fd38203a | 245 | assert(e); |
a71fe8b8 LP |
246 | |
247 | while ((s = e->sources)) { | |
248 | assert(s->floating); | |
249 | source_disconnect(s); | |
250 | sd_event_source_unref(s); | |
251 | } | |
252 | ||
15b38f93 | 253 | assert(e->n_sources == 0); |
fd38203a | 254 | |
afc6adb5 LP |
255 | if (e->default_event_ptr) |
256 | *(e->default_event_ptr) = NULL; | |
257 | ||
03e334a1 | 258 | safe_close(e->epoll_fd); |
03e334a1 | 259 | safe_close(e->watchdog_fd); |
cde93897 | 260 | |
6a0f1f6d | 261 | free_clock_data(&e->realtime); |
a8548816 | 262 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
263 | free_clock_data(&e->monotonic); |
264 | free_clock_data(&e->realtime_alarm); | |
265 | free_clock_data(&e->boottime_alarm); | |
266 | ||
fd38203a LP |
267 | prioq_free(e->pending); |
268 | prioq_free(e->prepare); | |
6203e07a | 269 | prioq_free(e->exit); |
fd38203a LP |
270 | |
271 | free(e->signal_sources); | |
9da4cb2b | 272 | hashmap_free(e->signal_data); |
fd38203a | 273 | |
97ef5391 LP |
274 | hashmap_free(e->inotify_data); |
275 | ||
fd38203a | 276 | hashmap_free(e->child_sources); |
6e9feda3 | 277 | set_free(e->post_sources); |
8301aa0b YW |
278 | |
279 | return mfree(e); | |
fd38203a LP |
280 | } |
281 | ||
f7262a9f | 282 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
283 | sd_event *e; |
284 | int r; | |
285 | ||
305f78bf | 286 | assert_return(ret, -EINVAL); |
fd38203a | 287 | |
d08eb1fa | 288 | e = new(sd_event, 1); |
fd38203a LP |
289 | if (!e) |
290 | return -ENOMEM; | |
291 | ||
d08eb1fa LP |
292 | *e = (sd_event) { |
293 | .n_ref = 1, | |
294 | .epoll_fd = -1, | |
295 | .watchdog_fd = -1, | |
296 | .realtime.wakeup = WAKEUP_CLOCK_DATA, | |
297 | .realtime.fd = -1, | |
298 | .realtime.next = USEC_INFINITY, | |
299 | .boottime.wakeup = WAKEUP_CLOCK_DATA, | |
300 | .boottime.fd = -1, | |
301 | .boottime.next = USEC_INFINITY, | |
302 | .monotonic.wakeup = WAKEUP_CLOCK_DATA, | |
303 | .monotonic.fd = -1, | |
304 | .monotonic.next = USEC_INFINITY, | |
305 | .realtime_alarm.wakeup = WAKEUP_CLOCK_DATA, | |
306 | .realtime_alarm.fd = -1, | |
307 | .realtime_alarm.next = USEC_INFINITY, | |
308 | .boottime_alarm.wakeup = WAKEUP_CLOCK_DATA, | |
309 | .boottime_alarm.fd = -1, | |
310 | .boottime_alarm.next = USEC_INFINITY, | |
311 | .perturb = USEC_INFINITY, | |
312 | .original_pid = getpid_cached(), | |
313 | }; | |
fd38203a | 314 | |
c983e776 EV |
315 | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
316 | if (r < 0) | |
fd38203a | 317 | goto fail; |
fd38203a LP |
318 | |
319 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
320 | if (e->epoll_fd < 0) { | |
321 | r = -errno; | |
322 | goto fail; | |
323 | } | |
324 | ||
7fe2903c LP |
325 | e->epoll_fd = fd_move_above_stdio(e->epoll_fd); |
326 | ||
34b87517 | 327 | if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) { |
34a6843d | 328 | 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 |
329 | e->profile_delays = true; |
330 | } | |
331 | ||
fd38203a LP |
332 | *ret = e; |
333 | return 0; | |
334 | ||
335 | fail: | |
336 | event_free(e); | |
337 | return r; | |
338 | } | |
339 | ||
8301aa0b | 340 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_event, sd_event, event_free); |
fd38203a | 341 | |
eaa3cbef LP |
342 | static bool event_pid_changed(sd_event *e) { |
343 | assert(e); | |
344 | ||
a2360a46 | 345 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
346 | * it around over a fork(). Let's complain. */ |
347 | ||
df0ff127 | 348 | return e->original_pid != getpid_cached(); |
eaa3cbef LP |
349 | } |
350 | ||
366e6411 | 351 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
352 | int r; |
353 | ||
354 | assert(s); | |
355 | assert(s->type == SOURCE_IO); | |
356 | ||
f6806734 | 357 | if (event_pid_changed(s->event)) |
366e6411 | 358 | return; |
f6806734 | 359 | |
fd38203a | 360 | if (!s->io.registered) |
366e6411 | 361 | return; |
fd38203a LP |
362 | |
363 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); | |
556c25cf | 364 | if (r < 0) |
55cbfaa5 DM |
365 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m", |
366 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a LP |
367 | |
368 | s->io.registered = false; | |
fd38203a LP |
369 | } |
370 | ||
305f78bf LP |
371 | static int source_io_register( |
372 | sd_event_source *s, | |
373 | int enabled, | |
374 | uint32_t events) { | |
375 | ||
a82f89aa | 376 | struct epoll_event ev; |
fd38203a LP |
377 | int r; |
378 | ||
379 | assert(s); | |
380 | assert(s->type == SOURCE_IO); | |
baf76283 | 381 | assert(enabled != SD_EVENT_OFF); |
fd38203a | 382 | |
a82f89aa LP |
383 | ev = (struct epoll_event) { |
384 | .events = events | (enabled == SD_EVENT_ONESHOT ? EPOLLONESHOT : 0), | |
385 | .data.ptr = s, | |
386 | }; | |
fd38203a LP |
387 | |
388 | if (s->io.registered) | |
389 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); | |
390 | else | |
391 | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); | |
fd38203a LP |
392 | if (r < 0) |
393 | return -errno; | |
394 | ||
395 | s->io.registered = true; | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
6a0f1f6d LP |
400 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
401 | ||
402 | switch (t) { | |
403 | ||
404 | case SOURCE_TIME_REALTIME: | |
405 | return CLOCK_REALTIME; | |
406 | ||
a8548816 TG |
407 | case SOURCE_TIME_BOOTTIME: |
408 | return CLOCK_BOOTTIME; | |
409 | ||
6a0f1f6d LP |
410 | case SOURCE_TIME_MONOTONIC: |
411 | return CLOCK_MONOTONIC; | |
412 | ||
413 | case SOURCE_TIME_REALTIME_ALARM: | |
414 | return CLOCK_REALTIME_ALARM; | |
415 | ||
416 | case SOURCE_TIME_BOOTTIME_ALARM: | |
417 | return CLOCK_BOOTTIME_ALARM; | |
418 | ||
419 | default: | |
420 | return (clockid_t) -1; | |
421 | } | |
422 | } | |
423 | ||
424 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
425 | ||
426 | switch (clock) { | |
427 | ||
428 | case CLOCK_REALTIME: | |
429 | return SOURCE_TIME_REALTIME; | |
430 | ||
a8548816 TG |
431 | case CLOCK_BOOTTIME: |
432 | return SOURCE_TIME_BOOTTIME; | |
433 | ||
6a0f1f6d LP |
434 | case CLOCK_MONOTONIC: |
435 | return SOURCE_TIME_MONOTONIC; | |
436 | ||
437 | case CLOCK_REALTIME_ALARM: | |
438 | return SOURCE_TIME_REALTIME_ALARM; | |
439 | ||
440 | case CLOCK_BOOTTIME_ALARM: | |
441 | return SOURCE_TIME_BOOTTIME_ALARM; | |
442 | ||
443 | default: | |
444 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
445 | } | |
446 | } | |
447 | ||
448 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
449 | assert(e); | |
450 | ||
451 | switch (t) { | |
452 | ||
453 | case SOURCE_TIME_REALTIME: | |
454 | return &e->realtime; | |
455 | ||
a8548816 TG |
456 | case SOURCE_TIME_BOOTTIME: |
457 | return &e->boottime; | |
458 | ||
6a0f1f6d LP |
459 | case SOURCE_TIME_MONOTONIC: |
460 | return &e->monotonic; | |
461 | ||
462 | case SOURCE_TIME_REALTIME_ALARM: | |
463 | return &e->realtime_alarm; | |
464 | ||
465 | case SOURCE_TIME_BOOTTIME_ALARM: | |
466 | return &e->boottime_alarm; | |
467 | ||
468 | default: | |
469 | return NULL; | |
470 | } | |
471 | } | |
472 | ||
3e4eb8e7 YW |
473 | static void event_free_signal_data(sd_event *e, struct signal_data *d) { |
474 | assert(e); | |
475 | ||
476 | if (!d) | |
477 | return; | |
478 | ||
479 | hashmap_remove(e->signal_data, &d->priority); | |
480 | safe_close(d->fd); | |
481 | free(d); | |
482 | } | |
483 | ||
9da4cb2b LP |
484 | static int event_make_signal_data( |
485 | sd_event *e, | |
486 | int sig, | |
487 | struct signal_data **ret) { | |
4807d2d0 | 488 | |
a82f89aa | 489 | struct epoll_event ev; |
9da4cb2b LP |
490 | struct signal_data *d; |
491 | bool added = false; | |
492 | sigset_t ss_copy; | |
493 | int64_t priority; | |
f95387cd ZJS |
494 | int r; |
495 | ||
496 | assert(e); | |
497 | ||
f6806734 | 498 | if (event_pid_changed(e)) |
9da4cb2b | 499 | return -ECHILD; |
f6806734 | 500 | |
9da4cb2b LP |
501 | if (e->signal_sources && e->signal_sources[sig]) |
502 | priority = e->signal_sources[sig]->priority; | |
503 | else | |
de05913d | 504 | priority = SD_EVENT_PRIORITY_NORMAL; |
f95387cd | 505 | |
9da4cb2b LP |
506 | d = hashmap_get(e->signal_data, &priority); |
507 | if (d) { | |
508 | if (sigismember(&d->sigset, sig) > 0) { | |
509 | if (ret) | |
510 | *ret = d; | |
511 | return 0; | |
512 | } | |
513 | } else { | |
514 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); | |
515 | if (r < 0) | |
516 | return r; | |
517 | ||
d08eb1fa | 518 | d = new(struct signal_data, 1); |
9da4cb2b LP |
519 | if (!d) |
520 | return -ENOMEM; | |
521 | ||
d08eb1fa LP |
522 | *d = (struct signal_data) { |
523 | .wakeup = WAKEUP_SIGNAL_DATA, | |
524 | .fd = -1, | |
525 | .priority = priority, | |
526 | }; | |
9da4cb2b LP |
527 | |
528 | r = hashmap_put(e->signal_data, &d->priority, d); | |
90f604d1 ZJS |
529 | if (r < 0) { |
530 | free(d); | |
9da4cb2b | 531 | return r; |
90f604d1 | 532 | } |
f95387cd | 533 | |
9da4cb2b LP |
534 | added = true; |
535 | } | |
536 | ||
537 | ss_copy = d->sigset; | |
538 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
539 | ||
540 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
541 | if (r < 0) { | |
542 | r = -errno; | |
543 | goto fail; | |
544 | } | |
545 | ||
546 | d->sigset = ss_copy; | |
f95387cd | 547 | |
9da4cb2b LP |
548 | if (d->fd >= 0) { |
549 | if (ret) | |
550 | *ret = d; | |
f95387cd | 551 | return 0; |
9da4cb2b LP |
552 | } |
553 | ||
7fe2903c | 554 | d->fd = fd_move_above_stdio(r); |
f95387cd | 555 | |
a82f89aa LP |
556 | ev = (struct epoll_event) { |
557 | .events = EPOLLIN, | |
558 | .data.ptr = d, | |
559 | }; | |
f95387cd | 560 | |
9da4cb2b LP |
561 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
562 | if (r < 0) { | |
563 | r = -errno; | |
564 | goto fail; | |
f95387cd ZJS |
565 | } |
566 | ||
9da4cb2b LP |
567 | if (ret) |
568 | *ret = d; | |
569 | ||
f95387cd | 570 | return 0; |
9da4cb2b LP |
571 | |
572 | fail: | |
3e4eb8e7 YW |
573 | if (added) |
574 | event_free_signal_data(e, d); | |
9da4cb2b LP |
575 | |
576 | return r; | |
577 | } | |
578 | ||
579 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
580 | assert(e); | |
581 | assert(d); | |
582 | ||
583 | /* Turns off the specified signal in the signal data | |
584 | * object. If the signal mask of the object becomes empty that | |
585 | * way removes it. */ | |
586 | ||
587 | if (sigismember(&d->sigset, sig) == 0) | |
588 | return; | |
589 | ||
590 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
591 | ||
592 | if (sigisemptyset(&d->sigset)) { | |
9da4cb2b | 593 | /* If all the mask is all-zero we can get rid of the structure */ |
3e4eb8e7 | 594 | event_free_signal_data(e, d); |
9da4cb2b LP |
595 | return; |
596 | } | |
597 | ||
598 | assert(d->fd >= 0); | |
599 | ||
600 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
601 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
602 | } | |
603 | ||
604 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
605 | struct signal_data *d; | |
606 | static const int64_t zero_priority = 0; | |
607 | ||
608 | assert(e); | |
609 | ||
610 | /* Rechecks if the specified signal is still something we are | |
611 | * interested in. If not, we'll unmask it, and possibly drop | |
612 | * the signalfd for it. */ | |
613 | ||
614 | if (sig == SIGCHLD && | |
615 | e->n_enabled_child_sources > 0) | |
616 | return; | |
617 | ||
618 | if (e->signal_sources && | |
619 | e->signal_sources[sig] && | |
620 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
621 | return; | |
622 | ||
623 | /* | |
624 | * The specified signal might be enabled in three different queues: | |
625 | * | |
626 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
627 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
628 | * 3) the 0 priority (to cover the SIGCHLD case) | |
629 | * | |
630 | * Hence, let's remove it from all three here. | |
631 | */ | |
632 | ||
633 | if (priority) { | |
634 | d = hashmap_get(e->signal_data, priority); | |
635 | if (d) | |
636 | event_unmask_signal_data(e, d, sig); | |
637 | } | |
638 | ||
639 | if (e->signal_sources && e->signal_sources[sig]) { | |
640 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
641 | if (d) | |
642 | event_unmask_signal_data(e, d, sig); | |
643 | } | |
644 | ||
645 | d = hashmap_get(e->signal_data, &zero_priority); | |
646 | if (d) | |
647 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
648 | } |
649 | ||
a71fe8b8 LP |
650 | static void source_disconnect(sd_event_source *s) { |
651 | sd_event *event; | |
652 | ||
fd38203a LP |
653 | assert(s); |
654 | ||
a71fe8b8 LP |
655 | if (!s->event) |
656 | return; | |
15b38f93 | 657 | |
a71fe8b8 | 658 | assert(s->event->n_sources > 0); |
fd38203a | 659 | |
a71fe8b8 | 660 | switch (s->type) { |
fd38203a | 661 | |
a71fe8b8 LP |
662 | case SOURCE_IO: |
663 | if (s->io.fd >= 0) | |
664 | source_io_unregister(s); | |
fd38203a | 665 | |
a71fe8b8 | 666 | break; |
6a0f1f6d | 667 | |
a71fe8b8 | 668 | case SOURCE_TIME_REALTIME: |
a8548816 | 669 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
670 | case SOURCE_TIME_MONOTONIC: |
671 | case SOURCE_TIME_REALTIME_ALARM: | |
672 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
673 | struct clock_data *d; | |
fd38203a | 674 | |
a71fe8b8 LP |
675 | d = event_get_clock_data(s->event, s->type); |
676 | assert(d); | |
677 | ||
678 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
679 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 680 | d->needs_rearm = true; |
a71fe8b8 LP |
681 | break; |
682 | } | |
683 | ||
684 | case SOURCE_SIGNAL: | |
685 | if (s->signal.sig > 0) { | |
9da4cb2b | 686 | |
a71fe8b8 LP |
687 | if (s->event->signal_sources) |
688 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 689 | |
9da4cb2b | 690 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 691 | } |
fd38203a | 692 | |
a71fe8b8 | 693 | break; |
fd38203a | 694 | |
a71fe8b8 LP |
695 | case SOURCE_CHILD: |
696 | if (s->child.pid > 0) { | |
697 | if (s->enabled != SD_EVENT_OFF) { | |
698 | assert(s->event->n_enabled_child_sources > 0); | |
699 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 700 | } |
fd38203a | 701 | |
4a0b58c4 | 702 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
9da4cb2b | 703 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
a71fe8b8 | 704 | } |
fd38203a | 705 | |
a71fe8b8 | 706 | break; |
fd38203a | 707 | |
a71fe8b8 LP |
708 | case SOURCE_DEFER: |
709 | /* nothing */ | |
710 | break; | |
fd38203a | 711 | |
a71fe8b8 LP |
712 | case SOURCE_POST: |
713 | set_remove(s->event->post_sources, s); | |
714 | break; | |
da7e457c | 715 | |
a71fe8b8 LP |
716 | case SOURCE_EXIT: |
717 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
718 | break; | |
0eb2e0e3 | 719 | |
97ef5391 LP |
720 | case SOURCE_INOTIFY: { |
721 | struct inode_data *inode_data; | |
722 | ||
723 | inode_data = s->inotify.inode_data; | |
724 | if (inode_data) { | |
725 | struct inotify_data *inotify_data; | |
726 | assert_se(inotify_data = inode_data->inotify_data); | |
727 | ||
728 | /* Detach this event source from the inode object */ | |
729 | LIST_REMOVE(inotify.by_inode_data, inode_data->event_sources, s); | |
730 | s->inotify.inode_data = NULL; | |
731 | ||
732 | if (s->pending) { | |
733 | assert(inotify_data->n_pending > 0); | |
734 | inotify_data->n_pending--; | |
735 | } | |
736 | ||
737 | /* Note that we don't reduce the inotify mask for the watch descriptor here if the inode is | |
738 | * continued to being watched. That's because inotify doesn't really have an API for that: we | |
739 | * can only change watch masks with access to the original inode either by fd or by path. But | |
740 | * paths aren't stable, and keeping an O_PATH fd open all the time would mean wasting an fd | |
f21f31b2 | 741 | * continuously and keeping the mount busy which we can't really do. We could reconstruct the |
97ef5391 LP |
742 | * original inode from /proc/self/fdinfo/$INOTIFY_FD (as all watch descriptors are listed |
743 | * there), but given the need for open_by_handle_at() which is privileged and not universally | |
744 | * available this would be quite an incomplete solution. Hence we go the other way, leave the | |
745 | * mask set, even if it is not minimized now, and ignore all events we aren't interested in | |
746 | * anymore after reception. Yes, this sucks, but … Linux … */ | |
747 | ||
748 | /* Maybe release the inode data (and its inotify) */ | |
749 | event_gc_inode_data(s->event, inode_data); | |
750 | } | |
751 | ||
752 | break; | |
753 | } | |
754 | ||
a71fe8b8 LP |
755 | default: |
756 | assert_not_reached("Wut? I shouldn't exist."); | |
757 | } | |
6e9feda3 | 758 | |
a71fe8b8 LP |
759 | if (s->pending) |
760 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 761 | |
a71fe8b8 LP |
762 | if (s->prepare) |
763 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 764 | |
a71fe8b8 | 765 | event = s->event; |
fd38203a | 766 | |
a71fe8b8 LP |
767 | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
768 | s->event = NULL; | |
769 | LIST_REMOVE(sources, event->sources, s); | |
770 | event->n_sources--; | |
fd38203a | 771 | |
a71fe8b8 LP |
772 | if (!s->floating) |
773 | sd_event_unref(event); | |
774 | } | |
775 | ||
776 | static void source_free(sd_event_source *s) { | |
777 | assert(s); | |
fd38203a | 778 | |
a71fe8b8 | 779 | source_disconnect(s); |
ab93297c NM |
780 | |
781 | if (s->type == SOURCE_IO && s->io.owned) | |
15723a1d LP |
782 | s->io.fd = safe_close(s->io.fd); |
783 | ||
784 | if (s->destroy_callback) | |
785 | s->destroy_callback(s->userdata); | |
ab93297c | 786 | |
356779df | 787 | free(s->description); |
fd38203a LP |
788 | free(s); |
789 | } | |
8c75fe17 | 790 | DEFINE_TRIVIAL_CLEANUP_FUNC(sd_event_source*, source_free); |
fd38203a LP |
791 | |
792 | static int source_set_pending(sd_event_source *s, bool b) { | |
793 | int r; | |
794 | ||
795 | assert(s); | |
6203e07a | 796 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
797 | |
798 | if (s->pending == b) | |
799 | return 0; | |
800 | ||
801 | s->pending = b; | |
802 | ||
803 | if (b) { | |
804 | s->pending_iteration = s->event->iteration; | |
805 | ||
806 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
807 | if (r < 0) { | |
808 | s->pending = false; | |
809 | return r; | |
810 | } | |
811 | } else | |
812 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
813 | ||
6a0f1f6d LP |
814 | if (EVENT_SOURCE_IS_TIME(s->type)) { |
815 | struct clock_data *d; | |
816 | ||
817 | d = event_get_clock_data(s->event, s->type); | |
818 | assert(d); | |
819 | ||
820 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
821 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 822 | d->needs_rearm = true; |
2576a19e LP |
823 | } |
824 | ||
9da4cb2b LP |
825 | if (s->type == SOURCE_SIGNAL && !b) { |
826 | struct signal_data *d; | |
827 | ||
828 | d = hashmap_get(s->event->signal_data, &s->priority); | |
829 | if (d && d->current == s) | |
830 | d->current = NULL; | |
831 | } | |
832 | ||
97ef5391 LP |
833 | if (s->type == SOURCE_INOTIFY) { |
834 | ||
835 | assert(s->inotify.inode_data); | |
836 | assert(s->inotify.inode_data->inotify_data); | |
837 | ||
838 | if (b) | |
839 | s->inotify.inode_data->inotify_data->n_pending ++; | |
840 | else { | |
841 | assert(s->inotify.inode_data->inotify_data->n_pending > 0); | |
842 | s->inotify.inode_data->inotify_data->n_pending --; | |
843 | } | |
844 | } | |
845 | ||
fd38203a LP |
846 | return 0; |
847 | } | |
848 | ||
a71fe8b8 | 849 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
850 | sd_event_source *s; |
851 | ||
852 | assert(e); | |
853 | ||
d08eb1fa | 854 | s = new(sd_event_source, 1); |
fd38203a LP |
855 | if (!s) |
856 | return NULL; | |
857 | ||
d08eb1fa LP |
858 | *s = (struct sd_event_source) { |
859 | .n_ref = 1, | |
860 | .event = e, | |
861 | .floating = floating, | |
862 | .type = type, | |
863 | .pending_index = PRIOQ_IDX_NULL, | |
864 | .prepare_index = PRIOQ_IDX_NULL, | |
865 | }; | |
a71fe8b8 LP |
866 | |
867 | if (!floating) | |
868 | sd_event_ref(e); | |
fd38203a | 869 | |
a71fe8b8 | 870 | LIST_PREPEND(sources, e->sources, s); |
313cefa1 | 871 | e->n_sources++; |
15b38f93 | 872 | |
fd38203a LP |
873 | return s; |
874 | } | |
875 | ||
f7262a9f | 876 | _public_ int sd_event_add_io( |
fd38203a | 877 | sd_event *e, |
151b9b96 | 878 | sd_event_source **ret, |
fd38203a LP |
879 | int fd, |
880 | uint32_t events, | |
718db961 | 881 | sd_event_io_handler_t callback, |
151b9b96 | 882 | void *userdata) { |
fd38203a | 883 | |
ec766a51 | 884 | _cleanup_(source_freep) sd_event_source *s = NULL; |
fd38203a LP |
885 | int r; |
886 | ||
305f78bf | 887 | assert_return(e, -EINVAL); |
b937d761 | 888 | assert_return(e = event_resolve(e), -ENOPKG); |
8ac43fee | 889 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 890 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
305f78bf | 891 | assert_return(callback, -EINVAL); |
da7e457c | 892 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 893 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 894 | |
a71fe8b8 | 895 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
896 | if (!s) |
897 | return -ENOMEM; | |
898 | ||
9da4cb2b | 899 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
900 | s->io.fd = fd; |
901 | s->io.events = events; | |
902 | s->io.callback = callback; | |
903 | s->userdata = userdata; | |
baf76283 | 904 | s->enabled = SD_EVENT_ON; |
fd38203a | 905 | |
baf76283 | 906 | r = source_io_register(s, s->enabled, events); |
ec766a51 | 907 | if (r < 0) |
050f74f2 | 908 | return r; |
fd38203a | 909 | |
a71fe8b8 LP |
910 | if (ret) |
911 | *ret = s; | |
ec766a51 | 912 | TAKE_PTR(s); |
a71fe8b8 | 913 | |
fd38203a LP |
914 | return 0; |
915 | } | |
916 | ||
52444dc4 LP |
917 | static void initialize_perturb(sd_event *e) { |
918 | sd_id128_t bootid = {}; | |
919 | ||
920 | /* When we sleep for longer, we try to realign the wakeup to | |
f21f31b2 | 921 | the same time within each minute/second/250ms, so that |
52444dc4 LP |
922 | events all across the system can be coalesced into a single |
923 | CPU wakeup. However, let's take some system-specific | |
924 | randomness for this value, so that in a network of systems | |
925 | with synced clocks timer events are distributed a | |
926 | bit. Here, we calculate a perturbation usec offset from the | |
927 | boot ID. */ | |
928 | ||
3a43da28 | 929 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
930 | return; |
931 | ||
932 | if (sd_id128_get_boot(&bootid) >= 0) | |
933 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
934 | } | |
935 | ||
fd38203a LP |
936 | static int event_setup_timer_fd( |
937 | sd_event *e, | |
6a0f1f6d LP |
938 | struct clock_data *d, |
939 | clockid_t clock) { | |
fd38203a | 940 | |
a82f89aa | 941 | struct epoll_event ev; |
fd38203a LP |
942 | int r, fd; |
943 | ||
944 | assert(e); | |
6a0f1f6d | 945 | assert(d); |
fd38203a | 946 | |
6a0f1f6d | 947 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
948 | return 0; |
949 | ||
6a0f1f6d | 950 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
951 | if (fd < 0) |
952 | return -errno; | |
953 | ||
7fe2903c LP |
954 | fd = fd_move_above_stdio(fd); |
955 | ||
a82f89aa LP |
956 | ev = (struct epoll_event) { |
957 | .events = EPOLLIN, | |
958 | .data.ptr = d, | |
959 | }; | |
fd38203a LP |
960 | |
961 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); | |
962 | if (r < 0) { | |
03e334a1 | 963 | safe_close(fd); |
fd38203a LP |
964 | return -errno; |
965 | } | |
966 | ||
6a0f1f6d | 967 | d->fd = fd; |
fd38203a LP |
968 | return 0; |
969 | } | |
970 | ||
c4f1aff2 TG |
971 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
972 | assert(s); | |
973 | ||
974 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
975 | } | |
976 | ||
6a0f1f6d | 977 | _public_ int sd_event_add_time( |
fd38203a | 978 | sd_event *e, |
151b9b96 | 979 | sd_event_source **ret, |
6a0f1f6d | 980 | clockid_t clock, |
fd38203a | 981 | uint64_t usec, |
c2ba3ad6 | 982 | uint64_t accuracy, |
718db961 | 983 | sd_event_time_handler_t callback, |
151b9b96 | 984 | void *userdata) { |
fd38203a | 985 | |
6a0f1f6d | 986 | EventSourceType type; |
ec766a51 | 987 | _cleanup_(source_freep) sd_event_source *s = NULL; |
6a0f1f6d | 988 | struct clock_data *d; |
fd38203a LP |
989 | int r; |
990 | ||
305f78bf | 991 | assert_return(e, -EINVAL); |
b937d761 | 992 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf | 993 | assert_return(accuracy != (uint64_t) -1, -EINVAL); |
da7e457c | 994 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 995 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 996 | |
e475d10c LP |
997 | if (!clock_supported(clock)) /* Checks whether the kernel supports the clock */ |
998 | return -EOPNOTSUPP; | |
999 | ||
1000 | type = clock_to_event_source_type(clock); /* checks whether sd-event supports this clock */ | |
1001 | if (type < 0) | |
3411372e LP |
1002 | return -EOPNOTSUPP; |
1003 | ||
c4f1aff2 TG |
1004 | if (!callback) |
1005 | callback = time_exit_callback; | |
1006 | ||
6a0f1f6d LP |
1007 | d = event_get_clock_data(e, type); |
1008 | assert(d); | |
c2ba3ad6 | 1009 | |
c983e776 EV |
1010 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1011 | if (r < 0) | |
1012 | return r; | |
fd38203a | 1013 | |
c983e776 EV |
1014 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1015 | if (r < 0) | |
1016 | return r; | |
fd38203a | 1017 | |
6a0f1f6d LP |
1018 | if (d->fd < 0) { |
1019 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1020 | if (r < 0) |
1021 | return r; | |
1022 | } | |
1023 | ||
a71fe8b8 | 1024 | s = source_new(e, !ret, type); |
fd38203a LP |
1025 | if (!s) |
1026 | return -ENOMEM; | |
1027 | ||
1028 | s->time.next = usec; | |
c2ba3ad6 | 1029 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1030 | s->time.callback = callback; |
da7e457c | 1031 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1032 | s->userdata = userdata; |
baf76283 | 1033 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1034 | |
e07bbb7c TG |
1035 | d->needs_rearm = true; |
1036 | ||
6a0f1f6d | 1037 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 | 1038 | if (r < 0) |
ec766a51 | 1039 | return r; |
c2ba3ad6 | 1040 | |
6a0f1f6d | 1041 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 | 1042 | if (r < 0) |
ec766a51 | 1043 | return r; |
fd38203a | 1044 | |
a71fe8b8 LP |
1045 | if (ret) |
1046 | *ret = s; | |
ec766a51 | 1047 | TAKE_PTR(s); |
a71fe8b8 | 1048 | |
fd38203a LP |
1049 | return 0; |
1050 | } | |
1051 | ||
59bc1fd7 LP |
1052 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1053 | assert(s); | |
1054 | ||
1055 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1056 | } | |
1057 | ||
f7262a9f | 1058 | _public_ int sd_event_add_signal( |
305f78bf | 1059 | sd_event *e, |
151b9b96 | 1060 | sd_event_source **ret, |
305f78bf | 1061 | int sig, |
718db961 | 1062 | sd_event_signal_handler_t callback, |
151b9b96 | 1063 | void *userdata) { |
305f78bf | 1064 | |
ec766a51 | 1065 | _cleanup_(source_freep) sd_event_source *s = NULL; |
9da4cb2b | 1066 | struct signal_data *d; |
3022d74b | 1067 | sigset_t ss; |
fd38203a LP |
1068 | int r; |
1069 | ||
305f78bf | 1070 | assert_return(e, -EINVAL); |
b937d761 | 1071 | assert_return(e = event_resolve(e), -ENOPKG); |
6eb7c172 | 1072 | assert_return(SIGNAL_VALID(sig), -EINVAL); |
da7e457c | 1073 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1074 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1075 | |
59bc1fd7 LP |
1076 | if (!callback) |
1077 | callback = signal_exit_callback; | |
1078 | ||
3022d74b | 1079 | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
50e0d56c LP |
1080 | if (r != 0) |
1081 | return -r; | |
3022d74b LP |
1082 | |
1083 | if (!sigismember(&ss, sig)) | |
1084 | return -EBUSY; | |
1085 | ||
fd38203a LP |
1086 | if (!e->signal_sources) { |
1087 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1088 | if (!e->signal_sources) | |
1089 | return -ENOMEM; | |
1090 | } else if (e->signal_sources[sig]) | |
1091 | return -EBUSY; | |
1092 | ||
a71fe8b8 | 1093 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1094 | if (!s) |
1095 | return -ENOMEM; | |
1096 | ||
1097 | s->signal.sig = sig; | |
1098 | s->signal.callback = callback; | |
1099 | s->userdata = userdata; | |
baf76283 | 1100 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1101 | |
1102 | e->signal_sources[sig] = s; | |
fd38203a | 1103 | |
9da4cb2b | 1104 | r = event_make_signal_data(e, sig, &d); |
ec766a51 | 1105 | if (r < 0) |
9da4cb2b | 1106 | return r; |
fd38203a | 1107 | |
f1f00dbb LP |
1108 | /* Use the signal name as description for the event source by default */ |
1109 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1110 | ||
a71fe8b8 LP |
1111 | if (ret) |
1112 | *ret = s; | |
ec766a51 | 1113 | TAKE_PTR(s); |
a71fe8b8 | 1114 | |
fd38203a LP |
1115 | return 0; |
1116 | } | |
1117 | ||
f7262a9f | 1118 | _public_ int sd_event_add_child( |
305f78bf | 1119 | sd_event *e, |
151b9b96 | 1120 | sd_event_source **ret, |
305f78bf LP |
1121 | pid_t pid, |
1122 | int options, | |
718db961 | 1123 | sd_event_child_handler_t callback, |
151b9b96 | 1124 | void *userdata) { |
305f78bf | 1125 | |
ec766a51 | 1126 | _cleanup_(source_freep) sd_event_source *s = NULL; |
fd38203a LP |
1127 | int r; |
1128 | ||
305f78bf | 1129 | assert_return(e, -EINVAL); |
b937d761 | 1130 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf LP |
1131 | assert_return(pid > 1, -EINVAL); |
1132 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1133 | assert_return(options != 0, -EINVAL); | |
1134 | assert_return(callback, -EINVAL); | |
da7e457c | 1135 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1136 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1137 | |
d5099efc | 1138 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1139 | if (r < 0) |
1140 | return r; | |
1141 | ||
4a0b58c4 | 1142 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1143 | return -EBUSY; |
1144 | ||
a71fe8b8 | 1145 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1146 | if (!s) |
1147 | return -ENOMEM; | |
1148 | ||
1149 | s->child.pid = pid; | |
1150 | s->child.options = options; | |
1151 | s->child.callback = callback; | |
1152 | s->userdata = userdata; | |
baf76283 | 1153 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1154 | |
4a0b58c4 | 1155 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
ec766a51 | 1156 | if (r < 0) |
fd38203a | 1157 | return r; |
fd38203a | 1158 | |
313cefa1 | 1159 | e->n_enabled_child_sources++; |
fd38203a | 1160 | |
9da4cb2b LP |
1161 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1162 | if (r < 0) { | |
1163 | e->n_enabled_child_sources--; | |
9da4cb2b | 1164 | return r; |
fd38203a LP |
1165 | } |
1166 | ||
c2ba3ad6 LP |
1167 | e->need_process_child = true; |
1168 | ||
a71fe8b8 LP |
1169 | if (ret) |
1170 | *ret = s; | |
ec766a51 | 1171 | TAKE_PTR(s); |
a71fe8b8 | 1172 | |
fd38203a LP |
1173 | return 0; |
1174 | } | |
1175 | ||
f7262a9f | 1176 | _public_ int sd_event_add_defer( |
305f78bf | 1177 | sd_event *e, |
151b9b96 | 1178 | sd_event_source **ret, |
718db961 | 1179 | sd_event_handler_t callback, |
151b9b96 | 1180 | void *userdata) { |
305f78bf | 1181 | |
ec766a51 | 1182 | _cleanup_(source_freep) sd_event_source *s = NULL; |
fd38203a LP |
1183 | int r; |
1184 | ||
305f78bf | 1185 | assert_return(e, -EINVAL); |
b937d761 | 1186 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf | 1187 | assert_return(callback, -EINVAL); |
da7e457c | 1188 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1189 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1190 | |
a71fe8b8 | 1191 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1192 | if (!s) |
1193 | return -ENOMEM; | |
1194 | ||
1195 | s->defer.callback = callback; | |
1196 | s->userdata = userdata; | |
baf76283 | 1197 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1198 | |
1199 | r = source_set_pending(s, true); | |
ec766a51 | 1200 | if (r < 0) |
fd38203a | 1201 | return r; |
fd38203a | 1202 | |
a71fe8b8 LP |
1203 | if (ret) |
1204 | *ret = s; | |
ec766a51 | 1205 | TAKE_PTR(s); |
a71fe8b8 | 1206 | |
fd38203a LP |
1207 | return 0; |
1208 | } | |
1209 | ||
6e9feda3 LP |
1210 | _public_ int sd_event_add_post( |
1211 | sd_event *e, | |
1212 | sd_event_source **ret, | |
1213 | sd_event_handler_t callback, | |
1214 | void *userdata) { | |
1215 | ||
ec766a51 | 1216 | _cleanup_(source_freep) sd_event_source *s = NULL; |
6e9feda3 LP |
1217 | int r; |
1218 | ||
1219 | assert_return(e, -EINVAL); | |
b937d761 | 1220 | assert_return(e = event_resolve(e), -ENOPKG); |
6e9feda3 | 1221 | assert_return(callback, -EINVAL); |
6e9feda3 LP |
1222 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1223 | assert_return(!event_pid_changed(e), -ECHILD); | |
1224 | ||
d5099efc | 1225 | r = set_ensure_allocated(&e->post_sources, NULL); |
6e9feda3 LP |
1226 | if (r < 0) |
1227 | return r; | |
1228 | ||
a71fe8b8 | 1229 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1230 | if (!s) |
1231 | return -ENOMEM; | |
1232 | ||
1233 | s->post.callback = callback; | |
1234 | s->userdata = userdata; | |
1235 | s->enabled = SD_EVENT_ON; | |
1236 | ||
1237 | r = set_put(e->post_sources, s); | |
ec766a51 | 1238 | if (r < 0) |
6e9feda3 | 1239 | return r; |
6e9feda3 | 1240 | |
a71fe8b8 LP |
1241 | if (ret) |
1242 | *ret = s; | |
ec766a51 | 1243 | TAKE_PTR(s); |
a71fe8b8 | 1244 | |
6e9feda3 LP |
1245 | return 0; |
1246 | } | |
1247 | ||
6203e07a | 1248 | _public_ int sd_event_add_exit( |
305f78bf | 1249 | sd_event *e, |
151b9b96 | 1250 | sd_event_source **ret, |
718db961 | 1251 | sd_event_handler_t callback, |
151b9b96 | 1252 | void *userdata) { |
305f78bf | 1253 | |
ec766a51 | 1254 | _cleanup_(source_freep) sd_event_source *s = NULL; |
da7e457c LP |
1255 | int r; |
1256 | ||
1257 | assert_return(e, -EINVAL); | |
b937d761 | 1258 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
1259 | assert_return(callback, -EINVAL); |
1260 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1261 | assert_return(!event_pid_changed(e), -ECHILD); | |
1262 | ||
c983e776 EV |
1263 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1264 | if (r < 0) | |
1265 | return r; | |
da7e457c | 1266 | |
a71fe8b8 | 1267 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1268 | if (!s) |
da7e457c | 1269 | return -ENOMEM; |
fd38203a | 1270 | |
6203e07a | 1271 | s->exit.callback = callback; |
da7e457c | 1272 | s->userdata = userdata; |
6203e07a | 1273 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1274 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1275 | |
6203e07a | 1276 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
ec766a51 | 1277 | if (r < 0) |
da7e457c | 1278 | return r; |
da7e457c | 1279 | |
a71fe8b8 LP |
1280 | if (ret) |
1281 | *ret = s; | |
ec766a51 | 1282 | TAKE_PTR(s); |
a71fe8b8 | 1283 | |
da7e457c LP |
1284 | return 0; |
1285 | } | |
1286 | ||
97ef5391 LP |
1287 | static void event_free_inotify_data(sd_event *e, struct inotify_data *d) { |
1288 | assert(e); | |
1289 | ||
1290 | if (!d) | |
1291 | return; | |
1292 | ||
1293 | assert(hashmap_isempty(d->inodes)); | |
1294 | assert(hashmap_isempty(d->wd)); | |
1295 | ||
1296 | if (d->buffer_filled > 0) | |
1297 | LIST_REMOVE(buffered, e->inotify_data_buffered, d); | |
1298 | ||
1299 | hashmap_free(d->inodes); | |
1300 | hashmap_free(d->wd); | |
1301 | ||
1302 | assert_se(hashmap_remove(e->inotify_data, &d->priority) == d); | |
1303 | ||
1304 | if (d->fd >= 0) { | |
1305 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, d->fd, NULL) < 0) | |
1306 | log_debug_errno(errno, "Failed to remove inotify fd from epoll, ignoring: %m"); | |
1307 | ||
1308 | safe_close(d->fd); | |
1309 | } | |
1310 | free(d); | |
1311 | } | |
1312 | ||
1313 | static int event_make_inotify_data( | |
1314 | sd_event *e, | |
1315 | int64_t priority, | |
1316 | struct inotify_data **ret) { | |
1317 | ||
1318 | _cleanup_close_ int fd = -1; | |
1319 | struct inotify_data *d; | |
1320 | struct epoll_event ev; | |
1321 | int r; | |
1322 | ||
1323 | assert(e); | |
1324 | ||
1325 | d = hashmap_get(e->inotify_data, &priority); | |
1326 | if (d) { | |
1327 | if (ret) | |
1328 | *ret = d; | |
1329 | return 0; | |
1330 | } | |
1331 | ||
1332 | fd = inotify_init1(IN_NONBLOCK|O_CLOEXEC); | |
1333 | if (fd < 0) | |
1334 | return -errno; | |
1335 | ||
1336 | fd = fd_move_above_stdio(fd); | |
1337 | ||
1338 | r = hashmap_ensure_allocated(&e->inotify_data, &uint64_hash_ops); | |
1339 | if (r < 0) | |
1340 | return r; | |
1341 | ||
1342 | d = new(struct inotify_data, 1); | |
1343 | if (!d) | |
1344 | return -ENOMEM; | |
1345 | ||
1346 | *d = (struct inotify_data) { | |
1347 | .wakeup = WAKEUP_INOTIFY_DATA, | |
1348 | .fd = TAKE_FD(fd), | |
1349 | .priority = priority, | |
1350 | }; | |
1351 | ||
1352 | r = hashmap_put(e->inotify_data, &d->priority, d); | |
1353 | if (r < 0) { | |
1354 | d->fd = safe_close(d->fd); | |
1355 | free(d); | |
1356 | return r; | |
1357 | } | |
1358 | ||
1359 | ev = (struct epoll_event) { | |
1360 | .events = EPOLLIN, | |
1361 | .data.ptr = d, | |
1362 | }; | |
1363 | ||
1364 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev) < 0) { | |
1365 | r = -errno; | |
1366 | d->fd = safe_close(d->fd); /* let's close this ourselves, as event_free_inotify_data() would otherwise | |
1367 | * remove the fd from the epoll first, which we don't want as we couldn't | |
1368 | * add it in the first place. */ | |
1369 | event_free_inotify_data(e, d); | |
1370 | return r; | |
1371 | } | |
1372 | ||
1373 | if (ret) | |
1374 | *ret = d; | |
1375 | ||
1376 | return 1; | |
1377 | } | |
1378 | ||
7a08d314 | 1379 | static int inode_data_compare(const struct inode_data *x, const struct inode_data *y) { |
90c88092 | 1380 | int r; |
97ef5391 LP |
1381 | |
1382 | assert(x); | |
1383 | assert(y); | |
1384 | ||
90c88092 YW |
1385 | r = CMP(x->dev, y->dev); |
1386 | if (r != 0) | |
1387 | return r; | |
97ef5391 | 1388 | |
6dd91b36 | 1389 | return CMP(x->ino, y->ino); |
97ef5391 LP |
1390 | } |
1391 | ||
7a08d314 YW |
1392 | static void inode_data_hash_func(const struct inode_data *d, struct siphash *state) { |
1393 | assert(d); | |
97ef5391 LP |
1394 | |
1395 | siphash24_compress(&d->dev, sizeof(d->dev), state); | |
1396 | siphash24_compress(&d->ino, sizeof(d->ino), state); | |
1397 | } | |
1398 | ||
7a08d314 | 1399 | DEFINE_PRIVATE_HASH_OPS(inode_data_hash_ops, struct inode_data, inode_data_hash_func, inode_data_compare); |
97ef5391 LP |
1400 | |
1401 | static void event_free_inode_data( | |
1402 | sd_event *e, | |
1403 | struct inode_data *d) { | |
1404 | ||
1405 | assert(e); | |
1406 | ||
1407 | if (!d) | |
1408 | return; | |
1409 | ||
1410 | assert(!d->event_sources); | |
1411 | ||
1412 | if (d->fd >= 0) { | |
1413 | LIST_REMOVE(to_close, e->inode_data_to_close, d); | |
1414 | safe_close(d->fd); | |
1415 | } | |
1416 | ||
1417 | if (d->inotify_data) { | |
1418 | ||
1419 | if (d->wd >= 0) { | |
1420 | if (d->inotify_data->fd >= 0) { | |
1421 | /* So here's a problem. At the time this runs the watch descriptor might already be | |
1422 | * invalidated, because an IN_IGNORED event might be queued right the moment we enter | |
1423 | * the syscall. Hence, whenever we get EINVAL, ignore it entirely, since it's a very | |
1424 | * likely case to happen. */ | |
1425 | ||
1426 | if (inotify_rm_watch(d->inotify_data->fd, d->wd) < 0 && errno != EINVAL) | |
1427 | log_debug_errno(errno, "Failed to remove watch descriptor %i from inotify, ignoring: %m", d->wd); | |
1428 | } | |
1429 | ||
1430 | assert_se(hashmap_remove(d->inotify_data->wd, INT_TO_PTR(d->wd)) == d); | |
1431 | } | |
1432 | ||
1433 | assert_se(hashmap_remove(d->inotify_data->inodes, d) == d); | |
1434 | } | |
1435 | ||
1436 | free(d); | |
1437 | } | |
1438 | ||
1439 | static void event_gc_inode_data( | |
1440 | sd_event *e, | |
1441 | struct inode_data *d) { | |
1442 | ||
1443 | struct inotify_data *inotify_data; | |
1444 | ||
1445 | assert(e); | |
1446 | ||
1447 | if (!d) | |
1448 | return; | |
1449 | ||
1450 | if (d->event_sources) | |
1451 | return; | |
1452 | ||
1453 | inotify_data = d->inotify_data; | |
1454 | event_free_inode_data(e, d); | |
1455 | ||
1456 | if (inotify_data && hashmap_isempty(inotify_data->inodes)) | |
1457 | event_free_inotify_data(e, inotify_data); | |
1458 | } | |
1459 | ||
1460 | static int event_make_inode_data( | |
1461 | sd_event *e, | |
1462 | struct inotify_data *inotify_data, | |
1463 | dev_t dev, | |
1464 | ino_t ino, | |
1465 | struct inode_data **ret) { | |
1466 | ||
1467 | struct inode_data *d, key; | |
1468 | int r; | |
1469 | ||
1470 | assert(e); | |
1471 | assert(inotify_data); | |
1472 | ||
1473 | key = (struct inode_data) { | |
1474 | .ino = ino, | |
1475 | .dev = dev, | |
1476 | }; | |
1477 | ||
1478 | d = hashmap_get(inotify_data->inodes, &key); | |
1479 | if (d) { | |
1480 | if (ret) | |
1481 | *ret = d; | |
1482 | ||
1483 | return 0; | |
1484 | } | |
1485 | ||
1486 | r = hashmap_ensure_allocated(&inotify_data->inodes, &inode_data_hash_ops); | |
1487 | if (r < 0) | |
1488 | return r; | |
1489 | ||
1490 | d = new(struct inode_data, 1); | |
1491 | if (!d) | |
1492 | return -ENOMEM; | |
1493 | ||
1494 | *d = (struct inode_data) { | |
1495 | .dev = dev, | |
1496 | .ino = ino, | |
1497 | .wd = -1, | |
1498 | .fd = -1, | |
1499 | .inotify_data = inotify_data, | |
1500 | }; | |
1501 | ||
1502 | r = hashmap_put(inotify_data->inodes, d, d); | |
1503 | if (r < 0) { | |
1504 | free(d); | |
1505 | return r; | |
1506 | } | |
1507 | ||
1508 | if (ret) | |
1509 | *ret = d; | |
1510 | ||
1511 | return 1; | |
1512 | } | |
1513 | ||
1514 | static uint32_t inode_data_determine_mask(struct inode_data *d) { | |
1515 | bool excl_unlink = true; | |
1516 | uint32_t combined = 0; | |
1517 | sd_event_source *s; | |
1518 | ||
1519 | assert(d); | |
1520 | ||
1521 | /* Combines the watch masks of all event sources watching this inode. We generally just OR them together, but | |
1522 | * the IN_EXCL_UNLINK flag is ANDed instead. | |
1523 | * | |
1524 | * Note that we add all sources to the mask here, regardless whether enabled, disabled or oneshot. That's | |
1525 | * because we cannot change the mask anymore after the event source was created once, since the kernel has no | |
f21f31b2 | 1526 | * API for that. Hence we need to subscribe to the maximum mask we ever might be interested in, and suppress |
97ef5391 LP |
1527 | * events we don't care for client-side. */ |
1528 | ||
1529 | LIST_FOREACH(inotify.by_inode_data, s, d->event_sources) { | |
1530 | ||
1531 | if ((s->inotify.mask & IN_EXCL_UNLINK) == 0) | |
1532 | excl_unlink = false; | |
1533 | ||
1534 | combined |= s->inotify.mask; | |
1535 | } | |
1536 | ||
1537 | return (combined & ~(IN_ONESHOT|IN_DONT_FOLLOW|IN_ONLYDIR|IN_EXCL_UNLINK)) | (excl_unlink ? IN_EXCL_UNLINK : 0); | |
1538 | } | |
1539 | ||
1540 | static int inode_data_realize_watch(sd_event *e, struct inode_data *d) { | |
1541 | uint32_t combined_mask; | |
1542 | int wd, r; | |
1543 | ||
1544 | assert(d); | |
1545 | assert(d->fd >= 0); | |
1546 | ||
1547 | combined_mask = inode_data_determine_mask(d); | |
1548 | ||
1549 | if (d->wd >= 0 && combined_mask == d->combined_mask) | |
1550 | return 0; | |
1551 | ||
1552 | r = hashmap_ensure_allocated(&d->inotify_data->wd, NULL); | |
1553 | if (r < 0) | |
1554 | return r; | |
1555 | ||
1556 | wd = inotify_add_watch_fd(d->inotify_data->fd, d->fd, combined_mask); | |
1557 | if (wd < 0) | |
1558 | return -errno; | |
1559 | ||
1560 | if (d->wd < 0) { | |
1561 | r = hashmap_put(d->inotify_data->wd, INT_TO_PTR(wd), d); | |
1562 | if (r < 0) { | |
1563 | (void) inotify_rm_watch(d->inotify_data->fd, wd); | |
1564 | return r; | |
1565 | } | |
1566 | ||
1567 | d->wd = wd; | |
1568 | ||
1569 | } else if (d->wd != wd) { | |
1570 | ||
1571 | log_debug("Weird, the watch descriptor we already knew for this inode changed?"); | |
1572 | (void) inotify_rm_watch(d->fd, wd); | |
1573 | return -EINVAL; | |
1574 | } | |
1575 | ||
1576 | d->combined_mask = combined_mask; | |
1577 | return 1; | |
1578 | } | |
1579 | ||
1580 | _public_ int sd_event_add_inotify( | |
1581 | sd_event *e, | |
1582 | sd_event_source **ret, | |
1583 | const char *path, | |
1584 | uint32_t mask, | |
1585 | sd_event_inotify_handler_t callback, | |
1586 | void *userdata) { | |
1587 | ||
97ef5391 LP |
1588 | struct inotify_data *inotify_data = NULL; |
1589 | struct inode_data *inode_data = NULL; | |
1590 | _cleanup_close_ int fd = -1; | |
8c75fe17 | 1591 | _cleanup_(source_freep) sd_event_source *s = NULL; |
97ef5391 LP |
1592 | struct stat st; |
1593 | int r; | |
1594 | ||
1595 | assert_return(e, -EINVAL); | |
1596 | assert_return(e = event_resolve(e), -ENOPKG); | |
1597 | assert_return(path, -EINVAL); | |
1598 | assert_return(callback, -EINVAL); | |
1599 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1600 | assert_return(!event_pid_changed(e), -ECHILD); | |
1601 | ||
1602 | /* Refuse IN_MASK_ADD since we coalesce watches on the same inode, and hence really don't want to merge | |
1603 | * masks. Or in other words, this whole code exists only to manage IN_MASK_ADD type operations for you, hence | |
1604 | * the user can't use them for us. */ | |
1605 | if (mask & IN_MASK_ADD) | |
1606 | return -EINVAL; | |
1607 | ||
1608 | fd = open(path, O_PATH|O_CLOEXEC| | |
1609 | (mask & IN_ONLYDIR ? O_DIRECTORY : 0)| | |
1610 | (mask & IN_DONT_FOLLOW ? O_NOFOLLOW : 0)); | |
1611 | if (fd < 0) | |
1612 | return -errno; | |
1613 | ||
1614 | if (fstat(fd, &st) < 0) | |
1615 | return -errno; | |
1616 | ||
1617 | s = source_new(e, !ret, SOURCE_INOTIFY); | |
1618 | if (!s) | |
1619 | return -ENOMEM; | |
1620 | ||
1621 | s->enabled = mask & IN_ONESHOT ? SD_EVENT_ONESHOT : SD_EVENT_ON; | |
1622 | s->inotify.mask = mask; | |
1623 | s->inotify.callback = callback; | |
1624 | s->userdata = userdata; | |
1625 | ||
1626 | /* Allocate an inotify object for this priority, and an inode object within it */ | |
1627 | r = event_make_inotify_data(e, SD_EVENT_PRIORITY_NORMAL, &inotify_data); | |
1628 | if (r < 0) | |
8c75fe17 | 1629 | return r; |
97ef5391 LP |
1630 | |
1631 | r = event_make_inode_data(e, inotify_data, st.st_dev, st.st_ino, &inode_data); | |
8c75fe17 ZJS |
1632 | if (r < 0) { |
1633 | event_free_inotify_data(e, inotify_data); | |
1634 | return r; | |
1635 | } | |
97ef5391 LP |
1636 | |
1637 | /* Keep the O_PATH fd around until the first iteration of the loop, so that we can still change the priority of | |
1638 | * the event source, until then, for which we need the original inode. */ | |
1639 | if (inode_data->fd < 0) { | |
1640 | inode_data->fd = TAKE_FD(fd); | |
1641 | LIST_PREPEND(to_close, e->inode_data_to_close, inode_data); | |
1642 | } | |
1643 | ||
1644 | /* Link our event source to the inode data object */ | |
1645 | LIST_PREPEND(inotify.by_inode_data, inode_data->event_sources, s); | |
1646 | s->inotify.inode_data = inode_data; | |
1647 | ||
97ef5391 LP |
1648 | /* Actually realize the watch now */ |
1649 | r = inode_data_realize_watch(e, inode_data); | |
1650 | if (r < 0) | |
8c75fe17 | 1651 | return r; |
97ef5391 LP |
1652 | |
1653 | (void) sd_event_source_set_description(s, path); | |
1654 | ||
1655 | if (ret) | |
1656 | *ret = s; | |
8c75fe17 | 1657 | TAKE_PTR(s); |
97ef5391 LP |
1658 | |
1659 | return 0; | |
97ef5391 LP |
1660 | } |
1661 | ||
8301aa0b | 1662 | static sd_event_source* event_source_free(sd_event_source *s) { |
6680dd6b LP |
1663 | if (!s) |
1664 | return NULL; | |
da7e457c | 1665 | |
8301aa0b YW |
1666 | /* Here's a special hack: when we are called from a |
1667 | * dispatch handler we won't free the event source | |
1668 | * immediately, but we will detach the fd from the | |
1669 | * epoll. This way it is safe for the caller to unref | |
1670 | * the event source and immediately close the fd, but | |
1671 | * we still retain a valid event source object after | |
1672 | * the callback. */ | |
fd38203a | 1673 | |
8301aa0b YW |
1674 | if (s->dispatching) { |
1675 | if (s->type == SOURCE_IO) | |
1676 | source_io_unregister(s); | |
fd38203a | 1677 | |
8301aa0b YW |
1678 | source_disconnect(s); |
1679 | } else | |
1680 | source_free(s); | |
fd38203a LP |
1681 | |
1682 | return NULL; | |
1683 | } | |
1684 | ||
8301aa0b YW |
1685 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_event_source, sd_event_source, event_source_free); |
1686 | ||
356779df | 1687 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1688 | assert_return(s, -EINVAL); |
f4b2933e | 1689 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1690 | |
356779df | 1691 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1692 | } |
1693 | ||
356779df | 1694 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1695 | assert_return(s, -EINVAL); |
356779df | 1696 | assert_return(description, -EINVAL); |
f4b2933e | 1697 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1698 | |
7d92a1a4 ZJS |
1699 | if (!s->description) |
1700 | return -ENXIO; | |
1701 | ||
356779df | 1702 | *description = s->description; |
f7f53e9e TG |
1703 | return 0; |
1704 | } | |
1705 | ||
adcc4ca3 | 1706 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1707 | assert_return(s, NULL); |
eaa3cbef LP |
1708 | |
1709 | return s->event; | |
1710 | } | |
1711 | ||
f7262a9f | 1712 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1713 | assert_return(s, -EINVAL); |
6203e07a | 1714 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1715 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1716 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1717 | |
1718 | return s->pending; | |
1719 | } | |
1720 | ||
f7262a9f | 1721 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
1722 | assert_return(s, -EINVAL); |
1723 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1724 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1725 | |
1726 | return s->io.fd; | |
1727 | } | |
1728 | ||
30caf8f3 LP |
1729 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1730 | int r; | |
1731 | ||
1732 | assert_return(s, -EINVAL); | |
8ac43fee | 1733 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
1734 | assert_return(s->type == SOURCE_IO, -EDOM); |
1735 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
1736 | ||
1737 | if (s->io.fd == fd) | |
1738 | return 0; | |
1739 | ||
1740 | if (s->enabled == SD_EVENT_OFF) { | |
1741 | s->io.fd = fd; | |
1742 | s->io.registered = false; | |
1743 | } else { | |
1744 | int saved_fd; | |
1745 | ||
1746 | saved_fd = s->io.fd; | |
1747 | assert(s->io.registered); | |
1748 | ||
1749 | s->io.fd = fd; | |
1750 | s->io.registered = false; | |
1751 | ||
1752 | r = source_io_register(s, s->enabled, s->io.events); | |
1753 | if (r < 0) { | |
1754 | s->io.fd = saved_fd; | |
1755 | s->io.registered = true; | |
1756 | return r; | |
1757 | } | |
1758 | ||
1759 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); | |
1760 | } | |
1761 | ||
1762 | return 0; | |
1763 | } | |
1764 | ||
ab93297c NM |
1765 | _public_ int sd_event_source_get_io_fd_own(sd_event_source *s) { |
1766 | assert_return(s, -EINVAL); | |
1767 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1768 | ||
1769 | return s->io.owned; | |
1770 | } | |
1771 | ||
1772 | _public_ int sd_event_source_set_io_fd_own(sd_event_source *s, int own) { | |
1773 | assert_return(s, -EINVAL); | |
1774 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1775 | ||
1776 | s->io.owned = own; | |
1777 | return 0; | |
1778 | } | |
1779 | ||
f7262a9f | 1780 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
1781 | assert_return(s, -EINVAL); |
1782 | assert_return(events, -EINVAL); | |
1783 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1784 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1785 | |
1786 | *events = s->io.events; | |
1787 | return 0; | |
1788 | } | |
1789 | ||
f7262a9f | 1790 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
1791 | int r; |
1792 | ||
305f78bf LP |
1793 | assert_return(s, -EINVAL); |
1794 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 1795 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1796 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1797 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1798 | |
b63c8d4f DH |
1799 | /* edge-triggered updates are never skipped, so we can reset edges */ |
1800 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
1801 | return 0; |
1802 | ||
2a0dc6cd LP |
1803 | r = source_set_pending(s, false); |
1804 | if (r < 0) | |
1805 | return r; | |
1806 | ||
baf76283 | 1807 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 1808 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
1809 | if (r < 0) |
1810 | return r; | |
1811 | } | |
1812 | ||
1813 | s->io.events = events; | |
1814 | ||
1815 | return 0; | |
1816 | } | |
1817 | ||
f7262a9f | 1818 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
1819 | assert_return(s, -EINVAL); |
1820 | assert_return(revents, -EINVAL); | |
1821 | assert_return(s->type == SOURCE_IO, -EDOM); | |
1822 | assert_return(s->pending, -ENODATA); | |
1823 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1824 | |
1825 | *revents = s->io.revents; | |
1826 | return 0; | |
1827 | } | |
1828 | ||
f7262a9f | 1829 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
1830 | assert_return(s, -EINVAL); |
1831 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
1832 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
1833 | |
1834 | return s->signal.sig; | |
1835 | } | |
1836 | ||
31927c16 | 1837 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
1838 | assert_return(s, -EINVAL); |
1839 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 1840 | |
6680b8d1 ME |
1841 | *priority = s->priority; |
1842 | return 0; | |
fd38203a LP |
1843 | } |
1844 | ||
31927c16 | 1845 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
97ef5391 LP |
1846 | bool rm_inotify = false, rm_inode = false; |
1847 | struct inotify_data *new_inotify_data = NULL; | |
1848 | struct inode_data *new_inode_data = NULL; | |
9da4cb2b LP |
1849 | int r; |
1850 | ||
305f78bf | 1851 | assert_return(s, -EINVAL); |
da7e457c | 1852 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1853 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1854 | |
1855 | if (s->priority == priority) | |
1856 | return 0; | |
1857 | ||
97ef5391 LP |
1858 | if (s->type == SOURCE_INOTIFY) { |
1859 | struct inode_data *old_inode_data; | |
1860 | ||
1861 | assert(s->inotify.inode_data); | |
1862 | old_inode_data = s->inotify.inode_data; | |
1863 | ||
1864 | /* We need the original fd to change the priority. If we don't have it we can't change the priority, | |
1865 | * anymore. Note that we close any fds when entering the next event loop iteration, i.e. for inotify | |
1866 | * events we allow priority changes only until the first following iteration. */ | |
1867 | if (old_inode_data->fd < 0) | |
1868 | return -EOPNOTSUPP; | |
1869 | ||
1870 | r = event_make_inotify_data(s->event, priority, &new_inotify_data); | |
1871 | if (r < 0) | |
1872 | return r; | |
1873 | rm_inotify = r > 0; | |
1874 | ||
1875 | r = event_make_inode_data(s->event, new_inotify_data, old_inode_data->dev, old_inode_data->ino, &new_inode_data); | |
1876 | if (r < 0) | |
1877 | goto fail; | |
1878 | rm_inode = r > 0; | |
1879 | ||
1880 | if (new_inode_data->fd < 0) { | |
1881 | /* Duplicate the fd for the new inode object if we don't have any yet */ | |
1882 | new_inode_data->fd = fcntl(old_inode_data->fd, F_DUPFD_CLOEXEC, 3); | |
1883 | if (new_inode_data->fd < 0) { | |
1884 | r = -errno; | |
1885 | goto fail; | |
1886 | } | |
1887 | ||
1888 | LIST_PREPEND(to_close, s->event->inode_data_to_close, new_inode_data); | |
1889 | } | |
1890 | ||
1891 | /* Move the event source to the new inode data structure */ | |
1892 | LIST_REMOVE(inotify.by_inode_data, old_inode_data->event_sources, s); | |
1893 | LIST_PREPEND(inotify.by_inode_data, new_inode_data->event_sources, s); | |
1894 | s->inotify.inode_data = new_inode_data; | |
1895 | ||
1896 | /* Now create the new watch */ | |
1897 | r = inode_data_realize_watch(s->event, new_inode_data); | |
1898 | if (r < 0) { | |
1899 | /* Move it back */ | |
1900 | LIST_REMOVE(inotify.by_inode_data, new_inode_data->event_sources, s); | |
1901 | LIST_PREPEND(inotify.by_inode_data, old_inode_data->event_sources, s); | |
1902 | s->inotify.inode_data = old_inode_data; | |
1903 | goto fail; | |
1904 | } | |
1905 | ||
1906 | s->priority = priority; | |
1907 | ||
1908 | event_gc_inode_data(s->event, old_inode_data); | |
1909 | ||
1910 | } else if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { | |
9da4cb2b LP |
1911 | struct signal_data *old, *d; |
1912 | ||
1913 | /* Move us from the signalfd belonging to the old | |
1914 | * priority to the signalfd of the new priority */ | |
1915 | ||
1916 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
1917 | ||
1918 | s->priority = priority; | |
1919 | ||
1920 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
1921 | if (r < 0) { | |
1922 | s->priority = old->priority; | |
1923 | return r; | |
1924 | } | |
1925 | ||
1926 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
1927 | } else | |
1928 | s->priority = priority; | |
fd38203a LP |
1929 | |
1930 | if (s->pending) | |
c2ba3ad6 | 1931 | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
fd38203a LP |
1932 | |
1933 | if (s->prepare) | |
c2ba3ad6 | 1934 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
fd38203a | 1935 | |
6203e07a LP |
1936 | if (s->type == SOURCE_EXIT) |
1937 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 1938 | |
fd38203a | 1939 | return 0; |
97ef5391 LP |
1940 | |
1941 | fail: | |
1942 | if (rm_inode) | |
1943 | event_free_inode_data(s->event, new_inode_data); | |
1944 | ||
1945 | if (rm_inotify) | |
1946 | event_free_inotify_data(s->event, new_inotify_data); | |
1947 | ||
1948 | return r; | |
fd38203a LP |
1949 | } |
1950 | ||
f7262a9f | 1951 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf | 1952 | assert_return(s, -EINVAL); |
305f78bf | 1953 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1954 | |
08c1eb0e ZJS |
1955 | if (m) |
1956 | *m = s->enabled; | |
1957 | return s->enabled != SD_EVENT_OFF; | |
fd38203a LP |
1958 | } |
1959 | ||
f7262a9f | 1960 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
fd38203a LP |
1961 | int r; |
1962 | ||
305f78bf | 1963 | assert_return(s, -EINVAL); |
945c2931 | 1964 | assert_return(IN_SET(m, SD_EVENT_OFF, SD_EVENT_ON, SD_EVENT_ONESHOT), -EINVAL); |
305f78bf | 1965 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 1966 | |
cc567911 LP |
1967 | /* If we are dead anyway, we are fine with turning off |
1968 | * sources, but everything else needs to fail. */ | |
1969 | if (s->event->state == SD_EVENT_FINISHED) | |
1970 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
1971 | ||
baf76283 | 1972 | if (s->enabled == m) |
fd38203a LP |
1973 | return 0; |
1974 | ||
baf76283 | 1975 | if (m == SD_EVENT_OFF) { |
fd38203a | 1976 | |
ac989a78 LP |
1977 | /* Unset the pending flag when this event source is disabled */ |
1978 | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { | |
1979 | r = source_set_pending(s, false); | |
1980 | if (r < 0) | |
1981 | return r; | |
1982 | } | |
1983 | ||
fd38203a LP |
1984 | switch (s->type) { |
1985 | ||
1986 | case SOURCE_IO: | |
366e6411 | 1987 | source_io_unregister(s); |
baf76283 | 1988 | s->enabled = m; |
fd38203a LP |
1989 | break; |
1990 | ||
6a0f1f6d | 1991 | case SOURCE_TIME_REALTIME: |
a8548816 | 1992 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
1993 | case SOURCE_TIME_MONOTONIC: |
1994 | case SOURCE_TIME_REALTIME_ALARM: | |
1995 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
1996 | struct clock_data *d; | |
fd38203a | 1997 | |
baf76283 | 1998 | s->enabled = m; |
6a0f1f6d LP |
1999 | d = event_get_clock_data(s->event, s->type); |
2000 | assert(d); | |
2001 | ||
2002 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
2003 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 2004 | d->needs_rearm = true; |
fd38203a | 2005 | break; |
6a0f1f6d | 2006 | } |
fd38203a LP |
2007 | |
2008 | case SOURCE_SIGNAL: | |
baf76283 | 2009 | s->enabled = m; |
4807d2d0 | 2010 | |
9da4cb2b | 2011 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
fd38203a LP |
2012 | break; |
2013 | ||
2014 | case SOURCE_CHILD: | |
baf76283 | 2015 | s->enabled = m; |
fd38203a | 2016 | |
baf76283 LP |
2017 | assert(s->event->n_enabled_child_sources > 0); |
2018 | s->event->n_enabled_child_sources--; | |
fd38203a | 2019 | |
9da4cb2b | 2020 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
fd38203a LP |
2021 | break; |
2022 | ||
6203e07a | 2023 | case SOURCE_EXIT: |
305f78bf | 2024 | s->enabled = m; |
6203e07a | 2025 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
2026 | break; |
2027 | ||
2028 | case SOURCE_DEFER: | |
6e9feda3 | 2029 | case SOURCE_POST: |
97ef5391 | 2030 | case SOURCE_INOTIFY: |
baf76283 | 2031 | s->enabled = m; |
fd38203a | 2032 | break; |
9d3e3aa5 | 2033 | |
6a0f1f6d | 2034 | default: |
9d3e3aa5 | 2035 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2036 | } |
2037 | ||
2038 | } else { | |
ac989a78 LP |
2039 | |
2040 | /* Unset the pending flag when this event source is enabled */ | |
2041 | if (s->enabled == SD_EVENT_OFF && !IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { | |
2042 | r = source_set_pending(s, false); | |
2043 | if (r < 0) | |
2044 | return r; | |
2045 | } | |
2046 | ||
fd38203a LP |
2047 | switch (s->type) { |
2048 | ||
2049 | case SOURCE_IO: | |
2050 | r = source_io_register(s, m, s->io.events); | |
2051 | if (r < 0) | |
2052 | return r; | |
2053 | ||
baf76283 | 2054 | s->enabled = m; |
fd38203a LP |
2055 | break; |
2056 | ||
6a0f1f6d | 2057 | case SOURCE_TIME_REALTIME: |
a8548816 | 2058 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2059 | case SOURCE_TIME_MONOTONIC: |
2060 | case SOURCE_TIME_REALTIME_ALARM: | |
2061 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
2062 | struct clock_data *d; | |
fd38203a | 2063 | |
baf76283 | 2064 | s->enabled = m; |
6a0f1f6d LP |
2065 | d = event_get_clock_data(s->event, s->type); |
2066 | assert(d); | |
2067 | ||
2068 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
2069 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 2070 | d->needs_rearm = true; |
fd38203a | 2071 | break; |
6a0f1f6d | 2072 | } |
fd38203a LP |
2073 | |
2074 | case SOURCE_SIGNAL: | |
4807d2d0 ZJS |
2075 | |
2076 | s->enabled = m; | |
9da4cb2b LP |
2077 | |
2078 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
2079 | if (r < 0) { | |
2080 | s->enabled = SD_EVENT_OFF; | |
2081 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
2082 | return r; | |
2083 | } | |
2084 | ||
fd38203a LP |
2085 | break; |
2086 | ||
2087 | case SOURCE_CHILD: | |
4807d2d0 | 2088 | |
9da4cb2b | 2089 | if (s->enabled == SD_EVENT_OFF) |
4807d2d0 | 2090 | s->event->n_enabled_child_sources++; |
7a0d4a3d DH |
2091 | |
2092 | s->enabled = m; | |
9da4cb2b | 2093 | |
10edebf6 | 2094 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
9da4cb2b LP |
2095 | if (r < 0) { |
2096 | s->enabled = SD_EVENT_OFF; | |
2097 | s->event->n_enabled_child_sources--; | |
2098 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
2099 | return r; | |
2100 | } | |
2101 | ||
fd38203a LP |
2102 | break; |
2103 | ||
6203e07a | 2104 | case SOURCE_EXIT: |
305f78bf | 2105 | s->enabled = m; |
6203e07a | 2106 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
305f78bf LP |
2107 | break; |
2108 | ||
2109 | case SOURCE_DEFER: | |
6e9feda3 | 2110 | case SOURCE_POST: |
97ef5391 | 2111 | case SOURCE_INOTIFY: |
baf76283 | 2112 | s->enabled = m; |
fd38203a | 2113 | break; |
9d3e3aa5 | 2114 | |
6a0f1f6d | 2115 | default: |
9d3e3aa5 | 2116 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2117 | } |
2118 | } | |
2119 | ||
2120 | if (s->pending) | |
2121 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
2122 | ||
2123 | if (s->prepare) | |
2124 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
2125 | ||
2126 | return 0; | |
2127 | } | |
2128 | ||
f7262a9f | 2129 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
2130 | assert_return(s, -EINVAL); |
2131 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 2132 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 2133 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
2134 | |
2135 | *usec = s->time.next; | |
2136 | return 0; | |
2137 | } | |
2138 | ||
f7262a9f | 2139 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
6a0f1f6d | 2140 | struct clock_data *d; |
2a0dc6cd | 2141 | int r; |
6a0f1f6d | 2142 | |
305f78bf | 2143 | assert_return(s, -EINVAL); |
6a0f1f6d | 2144 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 2145 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 2146 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 2147 | |
2a0dc6cd LP |
2148 | r = source_set_pending(s, false); |
2149 | if (r < 0) | |
2150 | return r; | |
2576a19e | 2151 | |
2a0dc6cd | 2152 | s->time.next = usec; |
fd38203a | 2153 | |
6a0f1f6d LP |
2154 | d = event_get_clock_data(s->event, s->type); |
2155 | assert(d); | |
2156 | ||
2157 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
2158 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 2159 | d->needs_rearm = true; |
fd38203a LP |
2160 | |
2161 | return 0; | |
2162 | } | |
2163 | ||
f7262a9f | 2164 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
2165 | assert_return(s, -EINVAL); |
2166 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 2167 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
2168 | assert_return(!event_pid_changed(s->event), -ECHILD); |
2169 | ||
2170 | *usec = s->time.accuracy; | |
2171 | return 0; | |
2172 | } | |
2173 | ||
f7262a9f | 2174 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
6a0f1f6d | 2175 | struct clock_data *d; |
2a0dc6cd | 2176 | int r; |
6a0f1f6d | 2177 | |
305f78bf LP |
2178 | assert_return(s, -EINVAL); |
2179 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 2180 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 2181 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 2182 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef | 2183 | |
2a0dc6cd LP |
2184 | r = source_set_pending(s, false); |
2185 | if (r < 0) | |
2186 | return r; | |
2187 | ||
eaa3cbef LP |
2188 | if (usec == 0) |
2189 | usec = DEFAULT_ACCURACY_USEC; | |
2190 | ||
eaa3cbef LP |
2191 | s->time.accuracy = usec; |
2192 | ||
6a0f1f6d LP |
2193 | d = event_get_clock_data(s->event, s->type); |
2194 | assert(d); | |
2195 | ||
2196 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
212bbb17 | 2197 | d->needs_rearm = true; |
6a0f1f6d LP |
2198 | |
2199 | return 0; | |
2200 | } | |
2201 | ||
2202 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
2203 | assert_return(s, -EINVAL); | |
2204 | assert_return(clock, -EINVAL); | |
2205 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
2206 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 2207 | |
6a0f1f6d | 2208 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
2209 | return 0; |
2210 | } | |
2211 | ||
f7262a9f | 2212 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
2213 | assert_return(s, -EINVAL); |
2214 | assert_return(pid, -EINVAL); | |
2215 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2216 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2217 | ||
2218 | *pid = s->child.pid; | |
2219 | return 0; | |
2220 | } | |
2221 | ||
97ef5391 LP |
2222 | _public_ int sd_event_source_get_inotify_mask(sd_event_source *s, uint32_t *mask) { |
2223 | assert_return(s, -EINVAL); | |
2224 | assert_return(mask, -EINVAL); | |
2225 | assert_return(s->type == SOURCE_INOTIFY, -EDOM); | |
2226 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2227 | ||
2228 | *mask = s->inotify.mask; | |
2229 | return 0; | |
2230 | } | |
2231 | ||
718db961 | 2232 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
2233 | int r; |
2234 | ||
da7e457c | 2235 | assert_return(s, -EINVAL); |
6203e07a | 2236 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
2237 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
2238 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
2239 | |
2240 | if (s->prepare == callback) | |
2241 | return 0; | |
2242 | ||
2243 | if (callback && s->prepare) { | |
2244 | s->prepare = callback; | |
2245 | return 0; | |
2246 | } | |
2247 | ||
2248 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
2249 | if (r < 0) | |
2250 | return r; | |
2251 | ||
2252 | s->prepare = callback; | |
2253 | ||
2254 | if (callback) { | |
2255 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
2256 | if (r < 0) | |
2257 | return r; | |
2258 | } else | |
2259 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
2260 | ||
2261 | return 0; | |
2262 | } | |
2263 | ||
f7262a9f | 2264 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 2265 | assert_return(s, NULL); |
fd38203a LP |
2266 | |
2267 | return s->userdata; | |
2268 | } | |
2269 | ||
8f726607 LP |
2270 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
2271 | void *ret; | |
2272 | ||
2273 | assert_return(s, NULL); | |
2274 | ||
2275 | ret = s->userdata; | |
2276 | s->userdata = userdata; | |
2277 | ||
2278 | return ret; | |
2279 | } | |
2280 | ||
c2ba3ad6 LP |
2281 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
2282 | usec_t c; | |
2283 | assert(e); | |
2284 | assert(a <= b); | |
2285 | ||
2286 | if (a <= 0) | |
2287 | return 0; | |
393003e1 LP |
2288 | if (a >= USEC_INFINITY) |
2289 | return USEC_INFINITY; | |
c2ba3ad6 LP |
2290 | |
2291 | if (b <= a + 1) | |
2292 | return a; | |
2293 | ||
52444dc4 LP |
2294 | initialize_perturb(e); |
2295 | ||
c2ba3ad6 LP |
2296 | /* |
2297 | Find a good time to wake up again between times a and b. We | |
2298 | have two goals here: | |
2299 | ||
2300 | a) We want to wake up as seldom as possible, hence prefer | |
2301 | later times over earlier times. | |
2302 | ||
2303 | b) But if we have to wake up, then let's make sure to | |
2304 | dispatch as much as possible on the entire system. | |
2305 | ||
2306 | We implement this by waking up everywhere at the same time | |
850516e0 | 2307 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 2308 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
2309 | then we try to find the same spot in every 10s, then 1s and |
2310 | then 250ms step. Otherwise, we pick the last possible time | |
2311 | to wake up. | |
c2ba3ad6 LP |
2312 | */ |
2313 | ||
850516e0 LP |
2314 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
2315 | if (c >= b) { | |
2316 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
2317 | return b; | |
2318 | ||
2319 | c -= USEC_PER_MINUTE; | |
2320 | } | |
2321 | ||
ba276c81 LP |
2322 | if (c >= a) |
2323 | return c; | |
2324 | ||
2325 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
2326 | if (c >= b) { | |
2327 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
2328 | return b; | |
2329 | ||
2330 | c -= USEC_PER_SEC*10; | |
2331 | } | |
2332 | ||
850516e0 LP |
2333 | if (c >= a) |
2334 | return c; | |
2335 | ||
2336 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
2337 | if (c >= b) { |
2338 | if (_unlikely_(c < USEC_PER_SEC)) | |
2339 | return b; | |
2340 | ||
2341 | c -= USEC_PER_SEC; | |
2342 | } | |
2343 | ||
2344 | if (c >= a) | |
2345 | return c; | |
2346 | ||
2347 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
2348 | if (c >= b) { | |
2349 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
2350 | return b; | |
2351 | ||
2352 | c -= USEC_PER_MSEC*250; | |
2353 | } | |
2354 | ||
2355 | if (c >= a) | |
2356 | return c; | |
2357 | ||
2358 | return b; | |
2359 | } | |
2360 | ||
fd38203a LP |
2361 | static int event_arm_timer( |
2362 | sd_event *e, | |
6a0f1f6d | 2363 | struct clock_data *d) { |
fd38203a LP |
2364 | |
2365 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
2366 | sd_event_source *a, *b; |
2367 | usec_t t; | |
fd38203a LP |
2368 | int r; |
2369 | ||
cde93897 | 2370 | assert(e); |
6a0f1f6d | 2371 | assert(d); |
fd38203a | 2372 | |
d06441da | 2373 | if (!d->needs_rearm) |
212bbb17 TG |
2374 | return 0; |
2375 | else | |
2376 | d->needs_rearm = false; | |
2377 | ||
6a0f1f6d | 2378 | a = prioq_peek(d->earliest); |
393003e1 | 2379 | if (!a || a->enabled == SD_EVENT_OFF || a->time.next == USEC_INFINITY) { |
72aedc1e | 2380 | |
6a0f1f6d | 2381 | if (d->fd < 0) |
c57b5ca3 LP |
2382 | return 0; |
2383 | ||
3a43da28 | 2384 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
2385 | return 0; |
2386 | ||
2387 | /* disarm */ | |
6a0f1f6d | 2388 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
72aedc1e LP |
2389 | if (r < 0) |
2390 | return r; | |
2391 | ||
3a43da28 | 2392 | d->next = USEC_INFINITY; |
fd38203a | 2393 | return 0; |
72aedc1e | 2394 | } |
fd38203a | 2395 | |
6a0f1f6d | 2396 | b = prioq_peek(d->latest); |
baf76283 | 2397 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 | 2398 | |
1bce0ffa | 2399 | t = sleep_between(e, a->time.next, time_event_source_latest(b)); |
6a0f1f6d | 2400 | if (d->next == t) |
fd38203a LP |
2401 | return 0; |
2402 | ||
6a0f1f6d | 2403 | assert_se(d->fd >= 0); |
fd38203a | 2404 | |
c2ba3ad6 | 2405 | if (t == 0) { |
fd38203a LP |
2406 | /* We don' want to disarm here, just mean some time looooong ago. */ |
2407 | its.it_value.tv_sec = 0; | |
2408 | its.it_value.tv_nsec = 1; | |
2409 | } else | |
c2ba3ad6 | 2410 | timespec_store(&its.it_value, t); |
fd38203a | 2411 | |
6a0f1f6d | 2412 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
fd38203a | 2413 | if (r < 0) |
cde93897 | 2414 | return -errno; |
fd38203a | 2415 | |
6a0f1f6d | 2416 | d->next = t; |
fd38203a LP |
2417 | return 0; |
2418 | } | |
2419 | ||
9a800b56 | 2420 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
2421 | assert(e); |
2422 | assert(s); | |
2423 | assert(s->type == SOURCE_IO); | |
2424 | ||
9a800b56 LP |
2425 | /* If the event source was already pending, we just OR in the |
2426 | * new revents, otherwise we reset the value. The ORing is | |
2427 | * necessary to handle EPOLLONESHOT events properly where | |
2428 | * readability might happen independently of writability, and | |
2429 | * we need to keep track of both */ | |
2430 | ||
2431 | if (s->pending) | |
2432 | s->io.revents |= revents; | |
2433 | else | |
2434 | s->io.revents = revents; | |
fd38203a | 2435 | |
fd38203a LP |
2436 | return source_set_pending(s, true); |
2437 | } | |
2438 | ||
72aedc1e | 2439 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2440 | uint64_t x; |
2441 | ssize_t ss; | |
2442 | ||
2443 | assert(e); | |
da7e457c | 2444 | assert(fd >= 0); |
72aedc1e | 2445 | |
305f78bf | 2446 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2447 | |
2448 | ss = read(fd, &x, sizeof(x)); | |
2449 | if (ss < 0) { | |
945c2931 | 2450 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
2451 | return 0; |
2452 | ||
2453 | return -errno; | |
2454 | } | |
2455 | ||
8d35dae7 | 2456 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2457 | return -EIO; |
2458 | ||
cde93897 | 2459 | if (next) |
3a43da28 | 2460 | *next = USEC_INFINITY; |
72aedc1e | 2461 | |
fd38203a LP |
2462 | return 0; |
2463 | } | |
2464 | ||
305f78bf LP |
2465 | static int process_timer( |
2466 | sd_event *e, | |
2467 | usec_t n, | |
6a0f1f6d | 2468 | struct clock_data *d) { |
305f78bf | 2469 | |
fd38203a LP |
2470 | sd_event_source *s; |
2471 | int r; | |
2472 | ||
2473 | assert(e); | |
6a0f1f6d | 2474 | assert(d); |
fd38203a LP |
2475 | |
2476 | for (;;) { | |
6a0f1f6d | 2477 | s = prioq_peek(d->earliest); |
fd38203a LP |
2478 | if (!s || |
2479 | s->time.next > n || | |
baf76283 | 2480 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2481 | s->pending) |
2482 | break; | |
2483 | ||
2484 | r = source_set_pending(s, true); | |
2485 | if (r < 0) | |
2486 | return r; | |
2487 | ||
6a0f1f6d LP |
2488 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2489 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
e07bbb7c | 2490 | d->needs_rearm = true; |
fd38203a LP |
2491 | } |
2492 | ||
2493 | return 0; | |
2494 | } | |
2495 | ||
2496 | static int process_child(sd_event *e) { | |
2497 | sd_event_source *s; | |
2498 | Iterator i; | |
2499 | int r; | |
2500 | ||
2501 | assert(e); | |
2502 | ||
c2ba3ad6 LP |
2503 | e->need_process_child = false; |
2504 | ||
fd38203a LP |
2505 | /* |
2506 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2507 | + WNOHANG for each PID we wait for, instead of using | |
2508 | P_ALL. This is because we only want to get child | |
2509 | information of very specific child processes, and not all | |
2510 | of them. We might not have processed the SIGCHLD even of a | |
2511 | previous invocation and we don't want to maintain a | |
2512 | unbounded *per-child* event queue, hence we really don't | |
2513 | want anything flushed out of the kernel's queue that we | |
2514 | don't care about. Since this is O(n) this means that if you | |
2515 | have a lot of processes you probably want to handle SIGCHLD | |
2516 | yourself. | |
08cd1552 LP |
2517 | |
2518 | We do not reap the children here (by using WNOWAIT), this | |
2519 | is only done after the event source is dispatched so that | |
2520 | the callback still sees the process as a zombie. | |
fd38203a LP |
2521 | */ |
2522 | ||
2523 | HASHMAP_FOREACH(s, e->child_sources, i) { | |
2524 | assert(s->type == SOURCE_CHILD); | |
2525 | ||
2526 | if (s->pending) | |
2527 | continue; | |
2528 | ||
baf76283 | 2529 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2530 | continue; |
2531 | ||
2532 | zero(s->child.siginfo); | |
08cd1552 LP |
2533 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2534 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); | |
fd38203a LP |
2535 | if (r < 0) |
2536 | return -errno; | |
2537 | ||
2538 | if (s->child.siginfo.si_pid != 0) { | |
945c2931 | 2539 | bool zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 LP |
2540 | |
2541 | if (!zombie && (s->child.options & WEXITED)) { | |
2542 | /* If the child isn't dead then let's | |
2543 | * immediately remove the state change | |
2544 | * from the queue, since there's no | |
2545 | * benefit in leaving it queued */ | |
2546 | ||
2547 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
2548 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); | |
2549 | } | |
2550 | ||
fd38203a LP |
2551 | r = source_set_pending(s, true); |
2552 | if (r < 0) | |
2553 | return r; | |
2554 | } | |
2555 | } | |
2556 | ||
fd38203a LP |
2557 | return 0; |
2558 | } | |
2559 | ||
9da4cb2b | 2560 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2561 | bool read_one = false; |
fd38203a LP |
2562 | int r; |
2563 | ||
da7e457c | 2564 | assert(e); |
97ef5391 | 2565 | assert(d); |
305f78bf | 2566 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2567 | |
9da4cb2b LP |
2568 | /* If there's a signal queued on this priority and SIGCHLD is |
2569 | on this priority too, then make sure to recheck the | |
2570 | children we watch. This is because we only ever dequeue | |
2571 | the first signal per priority, and if we dequeue one, and | |
2572 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2573 | might have higher priority children we care about hence we | |
2574 | need to check that explicitly. */ | |
2575 | ||
2576 | if (sigismember(&d->sigset, SIGCHLD)) | |
2577 | e->need_process_child = true; | |
2578 | ||
2579 | /* If there's already an event source pending for this | |
2580 | * priority we don't read another */ | |
2581 | if (d->current) | |
2582 | return 0; | |
2583 | ||
fd38203a | 2584 | for (;;) { |
0eb2e0e3 | 2585 | struct signalfd_siginfo si; |
7057bd99 | 2586 | ssize_t n; |
92daebc0 | 2587 | sd_event_source *s = NULL; |
fd38203a | 2588 | |
9da4cb2b | 2589 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 2590 | if (n < 0) { |
945c2931 | 2591 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
2592 | return read_one; |
2593 | ||
2594 | return -errno; | |
2595 | } | |
2596 | ||
7057bd99 | 2597 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
2598 | return -EIO; |
2599 | ||
6eb7c172 | 2600 | assert(SIGNAL_VALID(si.ssi_signo)); |
7057bd99 | 2601 | |
fd38203a LP |
2602 | read_one = true; |
2603 | ||
92daebc0 LP |
2604 | if (e->signal_sources) |
2605 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
2606 | if (!s) |
2607 | continue; | |
9da4cb2b LP |
2608 | if (s->pending) |
2609 | continue; | |
fd38203a LP |
2610 | |
2611 | s->signal.siginfo = si; | |
9da4cb2b LP |
2612 | d->current = s; |
2613 | ||
fd38203a LP |
2614 | r = source_set_pending(s, true); |
2615 | if (r < 0) | |
2616 | return r; | |
9da4cb2b LP |
2617 | |
2618 | return 1; | |
fd38203a | 2619 | } |
fd38203a LP |
2620 | } |
2621 | ||
97ef5391 LP |
2622 | static int event_inotify_data_read(sd_event *e, struct inotify_data *d, uint32_t revents) { |
2623 | ssize_t n; | |
2624 | ||
2625 | assert(e); | |
2626 | assert(d); | |
2627 | ||
2628 | assert_return(revents == EPOLLIN, -EIO); | |
2629 | ||
2630 | /* If there's already an event source pending for this priority, don't read another */ | |
2631 | if (d->n_pending > 0) | |
2632 | return 0; | |
2633 | ||
2634 | /* Is the read buffer non-empty? If so, let's not read more */ | |
2635 | if (d->buffer_filled > 0) | |
2636 | return 0; | |
2637 | ||
2638 | n = read(d->fd, &d->buffer, sizeof(d->buffer)); | |
2639 | if (n < 0) { | |
2640 | if (IN_SET(errno, EAGAIN, EINTR)) | |
2641 | return 0; | |
2642 | ||
2643 | return -errno; | |
2644 | } | |
2645 | ||
2646 | assert(n > 0); | |
2647 | d->buffer_filled = (size_t) n; | |
2648 | LIST_PREPEND(buffered, e->inotify_data_buffered, d); | |
2649 | ||
2650 | return 1; | |
2651 | } | |
2652 | ||
2653 | static void event_inotify_data_drop(sd_event *e, struct inotify_data *d, size_t sz) { | |
2654 | assert(e); | |
2655 | assert(d); | |
2656 | assert(sz <= d->buffer_filled); | |
2657 | ||
2658 | if (sz == 0) | |
2659 | return; | |
2660 | ||
2661 | /* Move the rest to the buffer to the front, in order to get things properly aligned again */ | |
2662 | memmove(d->buffer.raw, d->buffer.raw + sz, d->buffer_filled - sz); | |
2663 | d->buffer_filled -= sz; | |
2664 | ||
2665 | if (d->buffer_filled == 0) | |
2666 | LIST_REMOVE(buffered, e->inotify_data_buffered, d); | |
2667 | } | |
2668 | ||
2669 | static int event_inotify_data_process(sd_event *e, struct inotify_data *d) { | |
2670 | int r; | |
2671 | ||
2672 | assert(e); | |
2673 | assert(d); | |
2674 | ||
2675 | /* If there's already an event source pending for this priority, don't read another */ | |
2676 | if (d->n_pending > 0) | |
2677 | return 0; | |
2678 | ||
2679 | while (d->buffer_filled > 0) { | |
2680 | size_t sz; | |
2681 | ||
2682 | /* Let's validate that the event structures are complete */ | |
2683 | if (d->buffer_filled < offsetof(struct inotify_event, name)) | |
2684 | return -EIO; | |
2685 | ||
2686 | sz = offsetof(struct inotify_event, name) + d->buffer.ev.len; | |
2687 | if (d->buffer_filled < sz) | |
2688 | return -EIO; | |
2689 | ||
2690 | if (d->buffer.ev.mask & IN_Q_OVERFLOW) { | |
2691 | struct inode_data *inode_data; | |
2692 | Iterator i; | |
2693 | ||
2694 | /* The queue overran, let's pass this event to all event sources connected to this inotify | |
2695 | * object */ | |
2696 | ||
2697 | HASHMAP_FOREACH(inode_data, d->inodes, i) { | |
2698 | sd_event_source *s; | |
2699 | ||
2700 | LIST_FOREACH(inotify.by_inode_data, s, inode_data->event_sources) { | |
2701 | ||
2702 | if (s->enabled == SD_EVENT_OFF) | |
2703 | continue; | |
2704 | ||
2705 | r = source_set_pending(s, true); | |
2706 | if (r < 0) | |
2707 | return r; | |
2708 | } | |
2709 | } | |
2710 | } else { | |
2711 | struct inode_data *inode_data; | |
2712 | sd_event_source *s; | |
2713 | ||
2714 | /* Find the inode object for this watch descriptor. If IN_IGNORED is set we also remove it from | |
2715 | * our watch descriptor table. */ | |
2716 | if (d->buffer.ev.mask & IN_IGNORED) { | |
2717 | ||
2718 | inode_data = hashmap_remove(d->wd, INT_TO_PTR(d->buffer.ev.wd)); | |
2719 | if (!inode_data) { | |
2720 | event_inotify_data_drop(e, d, sz); | |
2721 | continue; | |
2722 | } | |
2723 | ||
2724 | /* The watch descriptor was removed by the kernel, let's drop it here too */ | |
2725 | inode_data->wd = -1; | |
2726 | } else { | |
2727 | inode_data = hashmap_get(d->wd, INT_TO_PTR(d->buffer.ev.wd)); | |
2728 | if (!inode_data) { | |
2729 | event_inotify_data_drop(e, d, sz); | |
2730 | continue; | |
2731 | } | |
2732 | } | |
2733 | ||
2734 | /* Trigger all event sources that are interested in these events. Also trigger all event | |
2735 | * sources if IN_IGNORED or IN_UNMOUNT is set. */ | |
2736 | LIST_FOREACH(inotify.by_inode_data, s, inode_data->event_sources) { | |
2737 | ||
2738 | if (s->enabled == SD_EVENT_OFF) | |
2739 | continue; | |
2740 | ||
2741 | if ((d->buffer.ev.mask & (IN_IGNORED|IN_UNMOUNT)) == 0 && | |
2742 | (s->inotify.mask & d->buffer.ev.mask & IN_ALL_EVENTS) == 0) | |
2743 | continue; | |
2744 | ||
2745 | r = source_set_pending(s, true); | |
2746 | if (r < 0) | |
2747 | return r; | |
2748 | } | |
2749 | } | |
2750 | ||
2751 | /* Something pending now? If so, let's finish, otherwise let's read more. */ | |
2752 | if (d->n_pending > 0) | |
2753 | return 1; | |
2754 | } | |
2755 | ||
2756 | return 0; | |
2757 | } | |
2758 | ||
2759 | static int process_inotify(sd_event *e) { | |
2760 | struct inotify_data *d; | |
2761 | int r, done = 0; | |
2762 | ||
2763 | assert(e); | |
2764 | ||
2765 | LIST_FOREACH(buffered, d, e->inotify_data_buffered) { | |
2766 | r = event_inotify_data_process(e, d); | |
2767 | if (r < 0) | |
2768 | return r; | |
2769 | if (r > 0) | |
2770 | done ++; | |
2771 | } | |
2772 | ||
2773 | return done; | |
2774 | } | |
2775 | ||
fd38203a | 2776 | static int source_dispatch(sd_event_source *s) { |
8f5c235d | 2777 | EventSourceType saved_type; |
fe8245eb | 2778 | int r = 0; |
fd38203a LP |
2779 | |
2780 | assert(s); | |
6203e07a | 2781 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 2782 | |
8f5c235d LP |
2783 | /* Save the event source type, here, so that we still know it after the event callback which might invalidate |
2784 | * the event. */ | |
2785 | saved_type = s->type; | |
2786 | ||
945c2931 | 2787 | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { |
da7e457c LP |
2788 | r = source_set_pending(s, false); |
2789 | if (r < 0) | |
2790 | return r; | |
2791 | } | |
fd38203a | 2792 | |
6e9feda3 LP |
2793 | if (s->type != SOURCE_POST) { |
2794 | sd_event_source *z; | |
2795 | Iterator i; | |
2796 | ||
2797 | /* If we execute a non-post source, let's mark all | |
2798 | * post sources as pending */ | |
2799 | ||
2800 | SET_FOREACH(z, s->event->post_sources, i) { | |
2801 | if (z->enabled == SD_EVENT_OFF) | |
2802 | continue; | |
2803 | ||
2804 | r = source_set_pending(z, true); | |
2805 | if (r < 0) | |
2806 | return r; | |
2807 | } | |
2808 | } | |
2809 | ||
baf76283 LP |
2810 | if (s->enabled == SD_EVENT_ONESHOT) { |
2811 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2812 | if (r < 0) |
2813 | return r; | |
2814 | } | |
2815 | ||
12179984 | 2816 | s->dispatching = true; |
b7484e2a | 2817 | |
fd38203a LP |
2818 | switch (s->type) { |
2819 | ||
2820 | case SOURCE_IO: | |
2821 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
2822 | break; | |
2823 | ||
6a0f1f6d | 2824 | case SOURCE_TIME_REALTIME: |
a8548816 | 2825 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
2826 | case SOURCE_TIME_MONOTONIC: |
2827 | case SOURCE_TIME_REALTIME_ALARM: | |
2828 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
2829 | r = s->time.callback(s, s->time.next, s->userdata); |
2830 | break; | |
2831 | ||
2832 | case SOURCE_SIGNAL: | |
2833 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
2834 | break; | |
2835 | ||
08cd1552 LP |
2836 | case SOURCE_CHILD: { |
2837 | bool zombie; | |
2838 | ||
945c2931 | 2839 | zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 | 2840 | |
fd38203a | 2841 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
2842 | |
2843 | /* Now, reap the PID for good. */ | |
2844 | if (zombie) | |
cc59d290 | 2845 | (void) waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); |
08cd1552 | 2846 | |
fd38203a | 2847 | break; |
08cd1552 | 2848 | } |
fd38203a LP |
2849 | |
2850 | case SOURCE_DEFER: | |
2851 | r = s->defer.callback(s, s->userdata); | |
2852 | break; | |
da7e457c | 2853 | |
6e9feda3 LP |
2854 | case SOURCE_POST: |
2855 | r = s->post.callback(s, s->userdata); | |
2856 | break; | |
2857 | ||
6203e07a LP |
2858 | case SOURCE_EXIT: |
2859 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 2860 | break; |
9d3e3aa5 | 2861 | |
97ef5391 LP |
2862 | case SOURCE_INOTIFY: { |
2863 | struct sd_event *e = s->event; | |
2864 | struct inotify_data *d; | |
2865 | size_t sz; | |
2866 | ||
2867 | assert(s->inotify.inode_data); | |
2868 | assert_se(d = s->inotify.inode_data->inotify_data); | |
2869 | ||
2870 | assert(d->buffer_filled >= offsetof(struct inotify_event, name)); | |
2871 | sz = offsetof(struct inotify_event, name) + d->buffer.ev.len; | |
2872 | assert(d->buffer_filled >= sz); | |
2873 | ||
2874 | r = s->inotify.callback(s, &d->buffer.ev, s->userdata); | |
2875 | ||
2876 | /* When no event is pending anymore on this inotify object, then let's drop the event from the | |
2877 | * buffer. */ | |
2878 | if (d->n_pending == 0) | |
2879 | event_inotify_data_drop(e, d, sz); | |
2880 | ||
2881 | break; | |
2882 | } | |
2883 | ||
9d3e3aa5 | 2884 | case SOURCE_WATCHDOG: |
a71fe8b8 | 2885 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 2886 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 2887 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
2888 | } |
2889 | ||
12179984 LP |
2890 | s->dispatching = false; |
2891 | ||
55cbfaa5 DM |
2892 | if (r < 0) |
2893 | log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m", | |
8f5c235d | 2894 | strna(s->description), event_source_type_to_string(saved_type)); |
12179984 LP |
2895 | |
2896 | if (s->n_ref == 0) | |
2897 | source_free(s); | |
2898 | else if (r < 0) | |
6203e07a | 2899 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 2900 | |
6203e07a | 2901 | return 1; |
fd38203a LP |
2902 | } |
2903 | ||
2904 | static int event_prepare(sd_event *e) { | |
2905 | int r; | |
2906 | ||
2907 | assert(e); | |
2908 | ||
2909 | for (;;) { | |
2910 | sd_event_source *s; | |
2911 | ||
2912 | s = prioq_peek(e->prepare); | |
baf76283 | 2913 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2914 | break; |
2915 | ||
2916 | s->prepare_iteration = e->iteration; | |
2917 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
2918 | if (r < 0) | |
2919 | return r; | |
2920 | ||
2921 | assert(s->prepare); | |
12179984 LP |
2922 | |
2923 | s->dispatching = true; | |
fd38203a | 2924 | r = s->prepare(s, s->userdata); |
12179984 LP |
2925 | s->dispatching = false; |
2926 | ||
55cbfaa5 DM |
2927 | if (r < 0) |
2928 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m", | |
2929 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a | 2930 | |
12179984 LP |
2931 | if (s->n_ref == 0) |
2932 | source_free(s); | |
2933 | else if (r < 0) | |
2934 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
2935 | } |
2936 | ||
2937 | return 0; | |
2938 | } | |
2939 | ||
6203e07a | 2940 | static int dispatch_exit(sd_event *e) { |
da7e457c | 2941 | sd_event_source *p; |
30dd293c | 2942 | _cleanup_(sd_event_unrefp) sd_event *ref = NULL; |
da7e457c LP |
2943 | int r; |
2944 | ||
2945 | assert(e); | |
2946 | ||
6203e07a | 2947 | p = prioq_peek(e->exit); |
baf76283 | 2948 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
2949 | e->state = SD_EVENT_FINISHED; |
2950 | return 0; | |
2951 | } | |
2952 | ||
30dd293c | 2953 | ref = sd_event_ref(e); |
da7e457c | 2954 | e->iteration++; |
6203e07a | 2955 | e->state = SD_EVENT_EXITING; |
da7e457c | 2956 | r = source_dispatch(p); |
2b0c9ef7 | 2957 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
2958 | return r; |
2959 | } | |
2960 | ||
c2ba3ad6 LP |
2961 | static sd_event_source* event_next_pending(sd_event *e) { |
2962 | sd_event_source *p; | |
2963 | ||
da7e457c LP |
2964 | assert(e); |
2965 | ||
c2ba3ad6 LP |
2966 | p = prioq_peek(e->pending); |
2967 | if (!p) | |
2968 | return NULL; | |
2969 | ||
baf76283 | 2970 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
2971 | return NULL; |
2972 | ||
2973 | return p; | |
2974 | } | |
2975 | ||
cde93897 LP |
2976 | static int arm_watchdog(sd_event *e) { |
2977 | struct itimerspec its = {}; | |
2978 | usec_t t; | |
2979 | int r; | |
2980 | ||
2981 | assert(e); | |
2982 | assert(e->watchdog_fd >= 0); | |
2983 | ||
2984 | t = sleep_between(e, | |
2985 | e->watchdog_last + (e->watchdog_period / 2), | |
2986 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
2987 | ||
2988 | timespec_store(&its.it_value, t); | |
2989 | ||
75145780 LP |
2990 | /* Make sure we never set the watchdog to 0, which tells the |
2991 | * kernel to disable it. */ | |
2992 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
2993 | its.it_value.tv_nsec = 1; | |
2994 | ||
cde93897 LP |
2995 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
2996 | if (r < 0) | |
2997 | return -errno; | |
2998 | ||
2999 | return 0; | |
3000 | } | |
3001 | ||
3002 | static int process_watchdog(sd_event *e) { | |
3003 | assert(e); | |
3004 | ||
3005 | if (!e->watchdog) | |
3006 | return 0; | |
3007 | ||
3008 | /* Don't notify watchdog too often */ | |
3009 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
3010 | return 0; | |
3011 | ||
3012 | sd_notify(false, "WATCHDOG=1"); | |
3013 | e->watchdog_last = e->timestamp.monotonic; | |
3014 | ||
3015 | return arm_watchdog(e); | |
3016 | } | |
3017 | ||
97ef5391 LP |
3018 | static void event_close_inode_data_fds(sd_event *e) { |
3019 | struct inode_data *d; | |
3020 | ||
3021 | assert(e); | |
3022 | ||
3023 | /* Close the fds pointing to the inodes to watch now. We need to close them as they might otherwise pin | |
3024 | * filesystems. But we can't close them right-away as we need them as long as the user still wants to make | |
3025 | * adjustments to the even source, such as changing the priority (which requires us to remove and readd a watch | |
3026 | * for the inode). Hence, let's close them when entering the first iteration after they were added, as a | |
3027 | * compromise. */ | |
3028 | ||
3029 | while ((d = e->inode_data_to_close)) { | |
3030 | assert(d->fd >= 0); | |
3031 | d->fd = safe_close(d->fd); | |
3032 | ||
3033 | LIST_REMOVE(to_close, e->inode_data_to_close, d); | |
3034 | } | |
3035 | } | |
3036 | ||
c45a5a74 TG |
3037 | _public_ int sd_event_prepare(sd_event *e) { |
3038 | int r; | |
fd38203a | 3039 | |
da7e457c | 3040 | assert_return(e, -EINVAL); |
b937d761 | 3041 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
3042 | assert_return(!event_pid_changed(e), -ECHILD); |
3043 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 3044 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 3045 | |
6203e07a | 3046 | if (e->exit_requested) |
c45a5a74 | 3047 | goto pending; |
fd38203a LP |
3048 | |
3049 | e->iteration++; | |
3050 | ||
0be6c2f6 | 3051 | e->state = SD_EVENT_PREPARING; |
fd38203a | 3052 | r = event_prepare(e); |
0be6c2f6 | 3053 | e->state = SD_EVENT_INITIAL; |
fd38203a | 3054 | if (r < 0) |
c45a5a74 | 3055 | return r; |
fd38203a | 3056 | |
6a0f1f6d LP |
3057 | r = event_arm_timer(e, &e->realtime); |
3058 | if (r < 0) | |
c45a5a74 | 3059 | return r; |
6a0f1f6d | 3060 | |
a8548816 TG |
3061 | r = event_arm_timer(e, &e->boottime); |
3062 | if (r < 0) | |
c45a5a74 | 3063 | return r; |
a8548816 | 3064 | |
6a0f1f6d LP |
3065 | r = event_arm_timer(e, &e->monotonic); |
3066 | if (r < 0) | |
c45a5a74 | 3067 | return r; |
6a0f1f6d LP |
3068 | |
3069 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 3070 | if (r < 0) |
c45a5a74 | 3071 | return r; |
fd38203a | 3072 | |
6a0f1f6d | 3073 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 3074 | if (r < 0) |
c45a5a74 | 3075 | return r; |
fd38203a | 3076 | |
97ef5391 LP |
3077 | event_close_inode_data_fds(e); |
3078 | ||
1b5995b0 | 3079 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
3080 | goto pending; |
3081 | ||
2b0c9ef7 | 3082 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
3083 | |
3084 | return 0; | |
3085 | ||
3086 | pending: | |
2b0c9ef7 | 3087 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
3088 | r = sd_event_wait(e, 0); |
3089 | if (r == 0) | |
2b0c9ef7 | 3090 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
3091 | |
3092 | return r; | |
c45a5a74 TG |
3093 | } |
3094 | ||
3095 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
3096 | struct epoll_event *ev_queue; | |
3097 | unsigned ev_queue_max; | |
3098 | int r, m, i; | |
3099 | ||
3100 | assert_return(e, -EINVAL); | |
b937d761 | 3101 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
3102 | assert_return(!event_pid_changed(e), -ECHILD); |
3103 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 3104 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
3105 | |
3106 | if (e->exit_requested) { | |
3107 | e->state = SD_EVENT_PENDING; | |
3108 | return 1; | |
3109 | } | |
6a0f1f6d | 3110 | |
1c724e9e | 3111 | ev_queue_max = MAX(e->n_sources, 1u); |
15b38f93 | 3112 | ev_queue = newa(struct epoll_event, ev_queue_max); |
fd38203a | 3113 | |
97ef5391 LP |
3114 | /* If we still have inotify data buffered, then query the other fds, but don't wait on it */ |
3115 | if (e->inotify_data_buffered) | |
3116 | timeout = 0; | |
3117 | ||
15b38f93 | 3118 | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
bab4820e | 3119 | timeout == (uint64_t) -1 ? -1 : (int) DIV_ROUND_UP(timeout, USEC_PER_MSEC)); |
da7e457c | 3120 | if (m < 0) { |
c45a5a74 TG |
3121 | if (errno == EINTR) { |
3122 | e->state = SD_EVENT_PENDING; | |
3123 | return 1; | |
3124 | } | |
3125 | ||
3126 | r = -errno; | |
da7e457c LP |
3127 | goto finish; |
3128 | } | |
fd38203a | 3129 | |
e475d10c | 3130 | triple_timestamp_get(&e->timestamp); |
fd38203a LP |
3131 | |
3132 | for (i = 0; i < m; i++) { | |
3133 | ||
9da4cb2b | 3134 | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
cde93897 | 3135 | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
9da4cb2b LP |
3136 | else { |
3137 | WakeupType *t = ev_queue[i].data.ptr; | |
3138 | ||
3139 | switch (*t) { | |
3140 | ||
3141 | case WAKEUP_EVENT_SOURCE: | |
3142 | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
3143 | break; | |
fd38203a | 3144 | |
9da4cb2b LP |
3145 | case WAKEUP_CLOCK_DATA: { |
3146 | struct clock_data *d = ev_queue[i].data.ptr; | |
3147 | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); | |
3148 | break; | |
3149 | } | |
3150 | ||
3151 | case WAKEUP_SIGNAL_DATA: | |
3152 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
3153 | break; | |
3154 | ||
97ef5391 LP |
3155 | case WAKEUP_INOTIFY_DATA: |
3156 | r = event_inotify_data_read(e, ev_queue[i].data.ptr, ev_queue[i].events); | |
3157 | break; | |
3158 | ||
9da4cb2b LP |
3159 | default: |
3160 | assert_not_reached("Invalid wake-up pointer"); | |
3161 | } | |
3162 | } | |
fd38203a | 3163 | if (r < 0) |
da7e457c | 3164 | goto finish; |
fd38203a LP |
3165 | } |
3166 | ||
cde93897 LP |
3167 | r = process_watchdog(e); |
3168 | if (r < 0) | |
3169 | goto finish; | |
3170 | ||
6a0f1f6d LP |
3171 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
3172 | if (r < 0) | |
3173 | goto finish; | |
3174 | ||
e475d10c | 3175 | r = process_timer(e, e->timestamp.boottime, &e->boottime); |
a8548816 TG |
3176 | if (r < 0) |
3177 | goto finish; | |
3178 | ||
6a0f1f6d LP |
3179 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
3180 | if (r < 0) | |
3181 | goto finish; | |
3182 | ||
3183 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 3184 | if (r < 0) |
da7e457c | 3185 | goto finish; |
fd38203a | 3186 | |
e475d10c | 3187 | r = process_timer(e, e->timestamp.boottime, &e->boottime_alarm); |
fd38203a | 3188 | if (r < 0) |
da7e457c | 3189 | goto finish; |
fd38203a | 3190 | |
c2ba3ad6 | 3191 | if (e->need_process_child) { |
fd38203a LP |
3192 | r = process_child(e); |
3193 | if (r < 0) | |
da7e457c | 3194 | goto finish; |
fd38203a LP |
3195 | } |
3196 | ||
97ef5391 LP |
3197 | r = process_inotify(e); |
3198 | if (r < 0) | |
3199 | goto finish; | |
3200 | ||
c45a5a74 TG |
3201 | if (event_next_pending(e)) { |
3202 | e->state = SD_EVENT_PENDING; | |
3203 | ||
3204 | return 1; | |
da7e457c LP |
3205 | } |
3206 | ||
c45a5a74 | 3207 | r = 0; |
fd38203a | 3208 | |
da7e457c | 3209 | finish: |
2b0c9ef7 | 3210 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
3211 | |
3212 | return r; | |
fd38203a LP |
3213 | } |
3214 | ||
c45a5a74 TG |
3215 | _public_ int sd_event_dispatch(sd_event *e) { |
3216 | sd_event_source *p; | |
3217 | int r; | |
3218 | ||
3219 | assert_return(e, -EINVAL); | |
b937d761 | 3220 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
3221 | assert_return(!event_pid_changed(e), -ECHILD); |
3222 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
3223 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
3224 | ||
3225 | if (e->exit_requested) | |
3226 | return dispatch_exit(e); | |
3227 | ||
3228 | p = event_next_pending(e); | |
3229 | if (p) { | |
30dd293c | 3230 | _cleanup_(sd_event_unrefp) sd_event *ref = NULL; |
c45a5a74 | 3231 | |
30dd293c | 3232 | ref = sd_event_ref(e); |
c45a5a74 TG |
3233 | e->state = SD_EVENT_RUNNING; |
3234 | r = source_dispatch(p); | |
2b0c9ef7 | 3235 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
3236 | return r; |
3237 | } | |
3238 | ||
2b0c9ef7 | 3239 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
3240 | |
3241 | return 1; | |
3242 | } | |
3243 | ||
34b87517 VC |
3244 | static void event_log_delays(sd_event *e) { |
3245 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1]; | |
34a6843d VC |
3246 | unsigned i; |
3247 | int o; | |
34b87517 VC |
3248 | |
3249 | for (i = o = 0; i < ELEMENTSOF(e->delays); i++) { | |
3250 | o += snprintf(&b[o], sizeof(b) - o, "%u ", e->delays[i]); | |
3251 | e->delays[i] = 0; | |
3252 | } | |
34a6843d | 3253 | log_debug("Event loop iterations: %.*s", o, b); |
34b87517 VC |
3254 | } |
3255 | ||
c45a5a74 TG |
3256 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
3257 | int r; | |
3258 | ||
3259 | assert_return(e, -EINVAL); | |
b937d761 | 3260 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
3261 | assert_return(!event_pid_changed(e), -ECHILD); |
3262 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 3263 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 | 3264 | |
34b87517 VC |
3265 | if (e->profile_delays && e->last_run) { |
3266 | usec_t this_run; | |
3267 | unsigned l; | |
3268 | ||
3269 | this_run = now(CLOCK_MONOTONIC); | |
3270 | ||
3271 | l = u64log2(this_run - e->last_run); | |
3272 | assert(l < sizeof(e->delays)); | |
3273 | e->delays[l]++; | |
3274 | ||
3275 | if (this_run - e->last_log >= 5*USEC_PER_SEC) { | |
3276 | event_log_delays(e); | |
3277 | e->last_log = this_run; | |
3278 | } | |
3279 | } | |
3280 | ||
c45a5a74 | 3281 | r = sd_event_prepare(e); |
53bac4e0 LP |
3282 | if (r == 0) |
3283 | /* There was nothing? Then wait... */ | |
3284 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 3285 | |
34b87517 VC |
3286 | if (e->profile_delays) |
3287 | e->last_run = now(CLOCK_MONOTONIC); | |
3288 | ||
02d30981 | 3289 | if (r > 0) { |
53bac4e0 | 3290 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
3291 | r = sd_event_dispatch(e); |
3292 | if (r < 0) | |
3293 | return r; | |
53bac4e0 LP |
3294 | |
3295 | return 1; | |
3296 | } | |
3297 | ||
3298 | return r; | |
c45a5a74 TG |
3299 | } |
3300 | ||
f7262a9f | 3301 | _public_ int sd_event_loop(sd_event *e) { |
30dd293c | 3302 | _cleanup_(sd_event_unrefp) sd_event *ref = NULL; |
fd38203a LP |
3303 | int r; |
3304 | ||
da7e457c | 3305 | assert_return(e, -EINVAL); |
b937d761 | 3306 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c | 3307 | assert_return(!event_pid_changed(e), -ECHILD); |
2b0c9ef7 | 3308 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 3309 | |
30dd293c | 3310 | ref = sd_event_ref(e); |
fd38203a | 3311 | |
da7e457c | 3312 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
3313 | r = sd_event_run(e, (uint64_t) -1); |
3314 | if (r < 0) | |
30dd293c | 3315 | return r; |
fd38203a LP |
3316 | } |
3317 | ||
30dd293c | 3318 | return e->exit_code; |
fd38203a LP |
3319 | } |
3320 | ||
9b364545 TG |
3321 | _public_ int sd_event_get_fd(sd_event *e) { |
3322 | ||
3323 | assert_return(e, -EINVAL); | |
b937d761 | 3324 | assert_return(e = event_resolve(e), -ENOPKG); |
9b364545 TG |
3325 | assert_return(!event_pid_changed(e), -ECHILD); |
3326 | ||
3327 | return e->epoll_fd; | |
3328 | } | |
3329 | ||
f7262a9f | 3330 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c | 3331 | assert_return(e, -EINVAL); |
b937d761 | 3332 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
3333 | assert_return(!event_pid_changed(e), -ECHILD); |
3334 | ||
3335 | return e->state; | |
3336 | } | |
3337 | ||
6203e07a | 3338 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 3339 | assert_return(e, -EINVAL); |
b937d761 | 3340 | assert_return(e = event_resolve(e), -ENOPKG); |
6203e07a | 3341 | assert_return(code, -EINVAL); |
da7e457c | 3342 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 3343 | |
6203e07a LP |
3344 | if (!e->exit_requested) |
3345 | return -ENODATA; | |
3346 | ||
3347 | *code = e->exit_code; | |
3348 | return 0; | |
fd38203a LP |
3349 | } |
3350 | ||
6203e07a | 3351 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c | 3352 | assert_return(e, -EINVAL); |
b937d761 | 3353 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
3354 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
3355 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 3356 | |
6203e07a LP |
3357 | e->exit_requested = true; |
3358 | e->exit_code = code; | |
3359 | ||
fd38203a LP |
3360 | return 0; |
3361 | } | |
46e8c825 | 3362 | |
6a0f1f6d | 3363 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 | 3364 | assert_return(e, -EINVAL); |
b937d761 | 3365 | assert_return(e = event_resolve(e), -ENOPKG); |
46e8c825 | 3366 | assert_return(usec, -EINVAL); |
46e8c825 LP |
3367 | assert_return(!event_pid_changed(e), -ECHILD); |
3368 | ||
e475d10c LP |
3369 | if (!TRIPLE_TIMESTAMP_HAS_CLOCK(clock)) |
3370 | return -EOPNOTSUPP; | |
3371 | ||
3372 | /* Generate a clean error in case CLOCK_BOOTTIME is not available. Note that don't use clock_supported() here, | |
3373 | * for a reason: there are systems where CLOCK_BOOTTIME is supported, but CLOCK_BOOTTIME_ALARM is not, but for | |
3374 | * the purpose of getting the time this doesn't matter. */ | |
3411372e LP |
3375 | if (IN_SET(clock, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM) && !clock_boottime_supported()) |
3376 | return -EOPNOTSUPP; | |
3377 | ||
e475d10c | 3378 | if (!triple_timestamp_is_set(&e->timestamp)) { |
38a03f06 LP |
3379 | /* Implicitly fall back to now() if we never ran |
3380 | * before and thus have no cached time. */ | |
3381 | *usec = now(clock); | |
3382 | return 1; | |
3383 | } | |
46e8c825 | 3384 | |
e475d10c | 3385 | *usec = triple_timestamp_by_clock(&e->timestamp, clock); |
46e8c825 LP |
3386 | return 0; |
3387 | } | |
afc6adb5 LP |
3388 | |
3389 | _public_ int sd_event_default(sd_event **ret) { | |
39883f62 | 3390 | sd_event *e = NULL; |
afc6adb5 LP |
3391 | int r; |
3392 | ||
3393 | if (!ret) | |
3394 | return !!default_event; | |
3395 | ||
3396 | if (default_event) { | |
3397 | *ret = sd_event_ref(default_event); | |
3398 | return 0; | |
3399 | } | |
3400 | ||
3401 | r = sd_event_new(&e); | |
3402 | if (r < 0) | |
3403 | return r; | |
3404 | ||
3405 | e->default_event_ptr = &default_event; | |
3406 | e->tid = gettid(); | |
3407 | default_event = e; | |
3408 | ||
3409 | *ret = e; | |
3410 | return 1; | |
3411 | } | |
3412 | ||
3413 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
3414 | assert_return(e, -EINVAL); | |
b937d761 | 3415 | assert_return(e = event_resolve(e), -ENOPKG); |
afc6adb5 | 3416 | assert_return(tid, -EINVAL); |
76b54375 | 3417 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 3418 | |
76b54375 LP |
3419 | if (e->tid != 0) { |
3420 | *tid = e->tid; | |
3421 | return 0; | |
3422 | } | |
3423 | ||
3424 | return -ENXIO; | |
afc6adb5 | 3425 | } |
cde93897 LP |
3426 | |
3427 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
3428 | int r; | |
3429 | ||
3430 | assert_return(e, -EINVAL); | |
b937d761 | 3431 | assert_return(e = event_resolve(e), -ENOPKG); |
8f726607 | 3432 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
3433 | |
3434 | if (e->watchdog == !!b) | |
3435 | return e->watchdog; | |
3436 | ||
3437 | if (b) { | |
a82f89aa | 3438 | struct epoll_event ev; |
cde93897 | 3439 | |
09812eb7 LP |
3440 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
3441 | if (r <= 0) | |
cde93897 | 3442 | return r; |
cde93897 LP |
3443 | |
3444 | /* Issue first ping immediately */ | |
3445 | sd_notify(false, "WATCHDOG=1"); | |
3446 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
3447 | ||
3448 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
3449 | if (e->watchdog_fd < 0) | |
3450 | return -errno; | |
3451 | ||
3452 | r = arm_watchdog(e); | |
3453 | if (r < 0) | |
3454 | goto fail; | |
3455 | ||
a82f89aa LP |
3456 | ev = (struct epoll_event) { |
3457 | .events = EPOLLIN, | |
3458 | .data.ptr = INT_TO_PTR(SOURCE_WATCHDOG), | |
3459 | }; | |
cde93897 LP |
3460 | |
3461 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); | |
3462 | if (r < 0) { | |
3463 | r = -errno; | |
3464 | goto fail; | |
3465 | } | |
3466 | ||
3467 | } else { | |
3468 | if (e->watchdog_fd >= 0) { | |
3469 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); | |
03e334a1 | 3470 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
3471 | } |
3472 | } | |
3473 | ||
3474 | e->watchdog = !!b; | |
3475 | return e->watchdog; | |
3476 | ||
3477 | fail: | |
03e334a1 | 3478 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
3479 | return r; |
3480 | } | |
8f726607 LP |
3481 | |
3482 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
3483 | assert_return(e, -EINVAL); | |
b937d761 | 3484 | assert_return(e = event_resolve(e), -ENOPKG); |
8f726607 LP |
3485 | assert_return(!event_pid_changed(e), -ECHILD); |
3486 | ||
3487 | return e->watchdog; | |
3488 | } | |
60a3b1e1 LP |
3489 | |
3490 | _public_ int sd_event_get_iteration(sd_event *e, uint64_t *ret) { | |
3491 | assert_return(e, -EINVAL); | |
b937d761 | 3492 | assert_return(e = event_resolve(e), -ENOPKG); |
60a3b1e1 LP |
3493 | assert_return(!event_pid_changed(e), -ECHILD); |
3494 | ||
3495 | *ret = e->iteration; | |
3496 | return 0; | |
3497 | } | |
15723a1d LP |
3498 | |
3499 | _public_ int sd_event_source_set_destroy_callback(sd_event_source *s, sd_event_destroy_t callback) { | |
3500 | assert_return(s, -EINVAL); | |
3501 | ||
3502 | s->destroy_callback = callback; | |
3503 | return 0; | |
3504 | } | |
3505 | ||
3506 | _public_ int sd_event_source_get_destroy_callback(sd_event_source *s, sd_event_destroy_t *ret) { | |
3507 | assert_return(s, -EINVAL); | |
3508 | ||
3509 | if (ret) | |
3510 | *ret = s->destroy_callback; | |
3511 | ||
3512 | return !!s->destroy_callback; | |
3513 | } | |
2382c936 YW |
3514 | |
3515 | _public_ int sd_event_source_get_floating(sd_event_source *s) { | |
3516 | assert_return(s, -EINVAL); | |
3517 | ||
3518 | return s->floating; | |
3519 | } | |
3520 | ||
3521 | _public_ int sd_event_source_set_floating(sd_event_source *s, int b) { | |
3522 | assert_return(s, -EINVAL); | |
3523 | ||
3524 | if (s->floating == !!b) | |
3525 | return 0; | |
3526 | ||
3527 | if (!s->event) /* Already disconnected */ | |
3528 | return -ESTALE; | |
3529 | ||
3530 | s->floating = b; | |
3531 | ||
3532 | if (b) { | |
3533 | sd_event_source_ref(s); | |
3534 | sd_event_unref(s->event); | |
3535 | } else { | |
3536 | sd_event_ref(s->event); | |
3537 | sd_event_source_unref(s); | |
3538 | } | |
3539 | ||
3540 | return 1; | |
3541 | } |