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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
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" |
f8f3f926 | 12 | #include "env-util.h" |
a137a1c3 | 13 | #include "event-source.h" |
3ffd4af2 | 14 | #include "fd-util.h" |
97ef5391 | 15 | #include "fs-util.h" |
fd38203a | 16 | #include "hashmap.h" |
07630cea LP |
17 | #include "list.h" |
18 | #include "macro.h" | |
0a970718 | 19 | #include "memory-util.h" |
f5947a5e | 20 | #include "missing_syscall.h" |
07630cea | 21 | #include "prioq.h" |
4a0b58c4 | 22 | #include "process-util.h" |
6e9feda3 | 23 | #include "set.h" |
24882e06 | 24 | #include "signal-util.h" |
55cbfaa5 | 25 | #include "string-table.h" |
07630cea | 26 | #include "string-util.h" |
442ac269 | 27 | #include "strxcpyx.h" |
07630cea | 28 | #include "time-util.h" |
fd38203a | 29 | |
c2ba3ad6 | 30 | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
fd38203a | 31 | |
f8f3f926 LP |
32 | static bool EVENT_SOURCE_WATCH_PIDFD(sd_event_source *s) { |
33 | /* Returns true if this is a PID event source and can be implemented by watching EPOLLIN */ | |
34 | return s && | |
35 | s->type == SOURCE_CHILD && | |
36 | s->child.pidfd >= 0 && | |
37 | s->child.options == WEXITED; | |
38 | } | |
39 | ||
b6d5481b LP |
40 | static bool event_source_is_online(sd_event_source *s) { |
41 | assert(s); | |
42 | return s->enabled != SD_EVENT_OFF && !s->ratelimited; | |
43 | } | |
44 | ||
45 | static bool event_source_is_offline(sd_event_source *s) { | |
46 | assert(s); | |
47 | return s->enabled == SD_EVENT_OFF || s->ratelimited; | |
48 | } | |
49 | ||
55cbfaa5 DM |
50 | static const char* const event_source_type_table[_SOURCE_EVENT_SOURCE_TYPE_MAX] = { |
51 | [SOURCE_IO] = "io", | |
52 | [SOURCE_TIME_REALTIME] = "realtime", | |
53 | [SOURCE_TIME_BOOTTIME] = "bootime", | |
54 | [SOURCE_TIME_MONOTONIC] = "monotonic", | |
55 | [SOURCE_TIME_REALTIME_ALARM] = "realtime-alarm", | |
56 | [SOURCE_TIME_BOOTTIME_ALARM] = "boottime-alarm", | |
57 | [SOURCE_SIGNAL] = "signal", | |
58 | [SOURCE_CHILD] = "child", | |
59 | [SOURCE_DEFER] = "defer", | |
60 | [SOURCE_POST] = "post", | |
61 | [SOURCE_EXIT] = "exit", | |
62 | [SOURCE_WATCHDOG] = "watchdog", | |
97ef5391 | 63 | [SOURCE_INOTIFY] = "inotify", |
55cbfaa5 DM |
64 | }; |
65 | ||
66 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(event_source_type, int); | |
67 | ||
b6d5481b LP |
68 | #define EVENT_SOURCE_IS_TIME(t) \ |
69 | IN_SET((t), \ | |
70 | SOURCE_TIME_REALTIME, \ | |
71 | SOURCE_TIME_BOOTTIME, \ | |
72 | SOURCE_TIME_MONOTONIC, \ | |
73 | SOURCE_TIME_REALTIME_ALARM, \ | |
74 | SOURCE_TIME_BOOTTIME_ALARM) | |
75 | ||
76 | #define EVENT_SOURCE_CAN_RATE_LIMIT(t) \ | |
77 | IN_SET((t), \ | |
78 | SOURCE_IO, \ | |
79 | SOURCE_TIME_REALTIME, \ | |
80 | SOURCE_TIME_BOOTTIME, \ | |
81 | SOURCE_TIME_MONOTONIC, \ | |
82 | SOURCE_TIME_REALTIME_ALARM, \ | |
83 | SOURCE_TIME_BOOTTIME_ALARM, \ | |
84 | SOURCE_SIGNAL, \ | |
85 | SOURCE_DEFER, \ | |
86 | SOURCE_INOTIFY) | |
6a0f1f6d | 87 | |
19947509 ZJS |
88 | /* This is used to assert that we didn't pass an unexpected source type to event_source_time_prioq_put(). |
89 | * Time sources and ratelimited sources can be passed, so effectively this is the same as the | |
90 | * EVENT_SOURCE_CAN_RATE_LIMIT() macro. */ | |
91 | #define EVENT_SOURCE_USES_TIME_PRIOQ(t) EVENT_SOURCE_CAN_RATE_LIMIT(t) | |
92 | ||
fd38203a | 93 | struct sd_event { |
da7e457c | 94 | unsigned n_ref; |
fd38203a LP |
95 | |
96 | int epoll_fd; | |
cde93897 | 97 | int watchdog_fd; |
fd38203a LP |
98 | |
99 | Prioq *pending; | |
100 | Prioq *prepare; | |
c2ba3ad6 | 101 | |
a8548816 | 102 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
103 | * can add support for more clocks when the kernel learns to |
104 | * deal with them, too. */ | |
105 | struct clock_data realtime; | |
a8548816 | 106 | struct clock_data boottime; |
6a0f1f6d LP |
107 | struct clock_data monotonic; |
108 | struct clock_data realtime_alarm; | |
109 | struct clock_data boottime_alarm; | |
fd38203a | 110 | |
da7e457c LP |
111 | usec_t perturb; |
112 | ||
9da4cb2b LP |
113 | sd_event_source **signal_sources; /* indexed by signal number */ |
114 | Hashmap *signal_data; /* indexed by priority */ | |
fd38203a LP |
115 | |
116 | Hashmap *child_sources; | |
b6d5481b | 117 | unsigned n_online_child_sources; |
fd38203a | 118 | |
6e9feda3 LP |
119 | Set *post_sources; |
120 | ||
6203e07a | 121 | Prioq *exit; |
fd38203a | 122 | |
97ef5391 LP |
123 | Hashmap *inotify_data; /* indexed by priority */ |
124 | ||
125 | /* A list of inode structures that still have an fd open, that we need to close before the next loop iteration */ | |
126 | LIST_HEAD(struct inode_data, inode_data_to_close); | |
127 | ||
128 | /* A list of inotify objects that already have events buffered which aren't processed yet */ | |
129 | LIST_HEAD(struct inotify_data, inotify_data_buffered); | |
130 | ||
da7e457c | 131 | pid_t original_pid; |
c2ba3ad6 | 132 | |
60a3b1e1 | 133 | uint64_t iteration; |
e475d10c | 134 | triple_timestamp timestamp; |
da7e457c | 135 | int state; |
eaa3cbef | 136 | |
6203e07a | 137 | bool exit_requested:1; |
da7e457c | 138 | bool need_process_child:1; |
cde93897 | 139 | bool watchdog:1; |
34b87517 | 140 | bool profile_delays:1; |
afc6adb5 | 141 | |
6203e07a LP |
142 | int exit_code; |
143 | ||
afc6adb5 LP |
144 | pid_t tid; |
145 | sd_event **default_event_ptr; | |
cde93897 LP |
146 | |
147 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
148 | |
149 | unsigned n_sources; | |
a71fe8b8 | 150 | |
5cddd924 | 151 | struct epoll_event *event_queue; |
5cddd924 | 152 | |
a71fe8b8 | 153 | LIST_HEAD(sd_event_source, sources); |
34b87517 | 154 | |
e6a7bee5 | 155 | usec_t last_run_usec, last_log_usec; |
34b87517 | 156 | unsigned delays[sizeof(usec_t) * 8]; |
fd38203a LP |
157 | }; |
158 | ||
b937d761 NM |
159 | static thread_local sd_event *default_event = NULL; |
160 | ||
a71fe8b8 | 161 | static void source_disconnect(sd_event_source *s); |
97ef5391 | 162 | static void event_gc_inode_data(sd_event *e, struct inode_data *d); |
a71fe8b8 | 163 | |
b937d761 NM |
164 | static sd_event *event_resolve(sd_event *e) { |
165 | return e == SD_EVENT_DEFAULT ? default_event : e; | |
166 | } | |
167 | ||
fd38203a LP |
168 | static int pending_prioq_compare(const void *a, const void *b) { |
169 | const sd_event_source *x = a, *y = b; | |
9c57a73b | 170 | int r; |
fd38203a LP |
171 | |
172 | assert(x->pending); | |
173 | assert(y->pending); | |
174 | ||
baf76283 | 175 | /* Enabled ones first */ |
06e13147 YW |
176 | r = CMP(x->enabled == SD_EVENT_OFF, y->enabled == SD_EVENT_OFF); |
177 | if (r != 0) | |
178 | return r; | |
fd38203a | 179 | |
b6d5481b LP |
180 | /* Non rate-limited ones first. */ |
181 | r = CMP(!!x->ratelimited, !!y->ratelimited); | |
182 | if (r != 0) | |
183 | return r; | |
184 | ||
fd38203a | 185 | /* Lower priority values first */ |
9c57a73b YW |
186 | r = CMP(x->priority, y->priority); |
187 | if (r != 0) | |
188 | return r; | |
fd38203a LP |
189 | |
190 | /* Older entries first */ | |
9c57a73b | 191 | return CMP(x->pending_iteration, y->pending_iteration); |
fd38203a LP |
192 | } |
193 | ||
194 | static int prepare_prioq_compare(const void *a, const void *b) { | |
195 | const sd_event_source *x = a, *y = b; | |
9c57a73b | 196 | int r; |
fd38203a LP |
197 | |
198 | assert(x->prepare); | |
199 | assert(y->prepare); | |
200 | ||
8046c457 | 201 | /* Enabled ones first */ |
06e13147 YW |
202 | r = CMP(x->enabled == SD_EVENT_OFF, y->enabled == SD_EVENT_OFF); |
203 | if (r != 0) | |
204 | return r; | |
8046c457 | 205 | |
b6d5481b LP |
206 | /* Non rate-limited ones first. */ |
207 | r = CMP(!!x->ratelimited, !!y->ratelimited); | |
208 | if (r != 0) | |
209 | return r; | |
210 | ||
fd38203a LP |
211 | /* Move most recently prepared ones last, so that we can stop |
212 | * preparing as soon as we hit one that has already been | |
213 | * prepared in the current iteration */ | |
9c57a73b YW |
214 | r = CMP(x->prepare_iteration, y->prepare_iteration); |
215 | if (r != 0) | |
216 | return r; | |
fd38203a | 217 | |
fd38203a | 218 | /* Lower priority values first */ |
9c57a73b | 219 | return CMP(x->priority, y->priority); |
fd38203a LP |
220 | } |
221 | ||
b6d5481b LP |
222 | static usec_t time_event_source_next(const sd_event_source *s) { |
223 | assert(s); | |
224 | ||
225 | /* We have two kinds of event sources that have elapsation times associated with them: the actual | |
226 | * time based ones and the ones for which a ratelimit can be in effect (where we want to be notified | |
227 | * once the ratelimit time window ends). Let's return the next elapsing time depending on what we are | |
228 | * looking at here. */ | |
229 | ||
230 | if (s->ratelimited) { /* If rate-limited the next elapsation is when the ratelimit time window ends */ | |
231 | assert(s->rate_limit.begin != 0); | |
232 | assert(s->rate_limit.interval != 0); | |
233 | return usec_add(s->rate_limit.begin, s->rate_limit.interval); | |
234 | } | |
235 | ||
236 | /* Otherwise this must be a time event source, if not ratelimited */ | |
237 | if (EVENT_SOURCE_IS_TIME(s->type)) | |
238 | return s->time.next; | |
239 | ||
240 | return USEC_INFINITY; | |
241 | } | |
242 | ||
1bce0ffa | 243 | static usec_t time_event_source_latest(const sd_event_source *s) { |
b6d5481b LP |
244 | assert(s); |
245 | ||
246 | if (s->ratelimited) { /* For ratelimited stuff the earliest and the latest time shall actually be the | |
247 | * same, as we should avoid adding additional inaccuracy on an inaccuracy time | |
248 | * window */ | |
249 | assert(s->rate_limit.begin != 0); | |
250 | assert(s->rate_limit.interval != 0); | |
251 | return usec_add(s->rate_limit.begin, s->rate_limit.interval); | |
252 | } | |
253 | ||
254 | /* Must be a time event source, if not ratelimited */ | |
255 | if (EVENT_SOURCE_IS_TIME(s->type)) | |
256 | return usec_add(s->time.next, s->time.accuracy); | |
257 | ||
258 | return USEC_INFINITY; | |
1bce0ffa LP |
259 | } |
260 | ||
81107b84 LP |
261 | static bool event_source_timer_candidate(const sd_event_source *s) { |
262 | assert(s); | |
263 | ||
264 | /* Returns true for event sources that either are not pending yet (i.e. where it's worth to mark them pending) | |
265 | * or which are currently ratelimited (i.e. where it's worth leaving the ratelimited state) */ | |
266 | return !s->pending || s->ratelimited; | |
267 | } | |
268 | ||
269 | static int time_prioq_compare(const void *a, const void *b, usec_t (*time_func)(const sd_event_source *s)) { | |
c2ba3ad6 | 270 | const sd_event_source *x = a, *y = b; |
06e13147 | 271 | int r; |
c2ba3ad6 | 272 | |
baf76283 | 273 | /* Enabled ones first */ |
06e13147 YW |
274 | r = CMP(x->enabled == SD_EVENT_OFF, y->enabled == SD_EVENT_OFF); |
275 | if (r != 0) | |
276 | return r; | |
c2ba3ad6 | 277 | |
81107b84 | 278 | /* Order "non-pending OR ratelimited" before "pending AND not-ratelimited" */ |
06e13147 YW |
279 | r = CMP(!event_source_timer_candidate(x), !event_source_timer_candidate(y)); |
280 | if (r != 0) | |
281 | return r; | |
c2ba3ad6 LP |
282 | |
283 | /* Order by time */ | |
81107b84 LP |
284 | return CMP(time_func(x), time_func(y)); |
285 | } | |
286 | ||
287 | static int earliest_time_prioq_compare(const void *a, const void *b) { | |
288 | return time_prioq_compare(a, b, time_event_source_next); | |
289 | } | |
290 | ||
291 | static int latest_time_prioq_compare(const void *a, const void *b) { | |
292 | return time_prioq_compare(a, b, time_event_source_latest); | |
c2ba3ad6 LP |
293 | } |
294 | ||
6203e07a | 295 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c | 296 | const sd_event_source *x = a, *y = b; |
06e13147 | 297 | int r; |
da7e457c | 298 | |
6203e07a LP |
299 | assert(x->type == SOURCE_EXIT); |
300 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 301 | |
baf76283 | 302 | /* Enabled ones first */ |
06e13147 YW |
303 | r = CMP(x->enabled == SD_EVENT_OFF, y->enabled == SD_EVENT_OFF); |
304 | if (r != 0) | |
305 | return r; | |
da7e457c LP |
306 | |
307 | /* Lower priority values first */ | |
6dd91b36 | 308 | return CMP(x->priority, y->priority); |
da7e457c LP |
309 | } |
310 | ||
6a0f1f6d LP |
311 | static void free_clock_data(struct clock_data *d) { |
312 | assert(d); | |
9da4cb2b | 313 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
314 | |
315 | safe_close(d->fd); | |
316 | prioq_free(d->earliest); | |
317 | prioq_free(d->latest); | |
318 | } | |
319 | ||
8301aa0b | 320 | static sd_event *event_free(sd_event *e) { |
a71fe8b8 LP |
321 | sd_event_source *s; |
322 | ||
fd38203a | 323 | assert(e); |
a71fe8b8 LP |
324 | |
325 | while ((s = e->sources)) { | |
326 | assert(s->floating); | |
327 | source_disconnect(s); | |
328 | sd_event_source_unref(s); | |
329 | } | |
330 | ||
15b38f93 | 331 | assert(e->n_sources == 0); |
fd38203a | 332 | |
afc6adb5 LP |
333 | if (e->default_event_ptr) |
334 | *(e->default_event_ptr) = NULL; | |
335 | ||
03e334a1 | 336 | safe_close(e->epoll_fd); |
03e334a1 | 337 | safe_close(e->watchdog_fd); |
cde93897 | 338 | |
6a0f1f6d | 339 | free_clock_data(&e->realtime); |
a8548816 | 340 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
341 | free_clock_data(&e->monotonic); |
342 | free_clock_data(&e->realtime_alarm); | |
343 | free_clock_data(&e->boottime_alarm); | |
344 | ||
fd38203a LP |
345 | prioq_free(e->pending); |
346 | prioq_free(e->prepare); | |
6203e07a | 347 | prioq_free(e->exit); |
fd38203a LP |
348 | |
349 | free(e->signal_sources); | |
9da4cb2b | 350 | hashmap_free(e->signal_data); |
fd38203a | 351 | |
97ef5391 LP |
352 | hashmap_free(e->inotify_data); |
353 | ||
fd38203a | 354 | hashmap_free(e->child_sources); |
6e9feda3 | 355 | set_free(e->post_sources); |
8301aa0b | 356 | |
5cddd924 LP |
357 | free(e->event_queue); |
358 | ||
8301aa0b | 359 | return mfree(e); |
fd38203a LP |
360 | } |
361 | ||
f7262a9f | 362 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
363 | sd_event *e; |
364 | int r; | |
365 | ||
305f78bf | 366 | assert_return(ret, -EINVAL); |
fd38203a | 367 | |
d08eb1fa | 368 | e = new(sd_event, 1); |
fd38203a LP |
369 | if (!e) |
370 | return -ENOMEM; | |
371 | ||
d08eb1fa LP |
372 | *e = (sd_event) { |
373 | .n_ref = 1, | |
374 | .epoll_fd = -1, | |
375 | .watchdog_fd = -1, | |
376 | .realtime.wakeup = WAKEUP_CLOCK_DATA, | |
377 | .realtime.fd = -1, | |
378 | .realtime.next = USEC_INFINITY, | |
379 | .boottime.wakeup = WAKEUP_CLOCK_DATA, | |
380 | .boottime.fd = -1, | |
381 | .boottime.next = USEC_INFINITY, | |
382 | .monotonic.wakeup = WAKEUP_CLOCK_DATA, | |
383 | .monotonic.fd = -1, | |
384 | .monotonic.next = USEC_INFINITY, | |
385 | .realtime_alarm.wakeup = WAKEUP_CLOCK_DATA, | |
386 | .realtime_alarm.fd = -1, | |
387 | .realtime_alarm.next = USEC_INFINITY, | |
388 | .boottime_alarm.wakeup = WAKEUP_CLOCK_DATA, | |
389 | .boottime_alarm.fd = -1, | |
390 | .boottime_alarm.next = USEC_INFINITY, | |
391 | .perturb = USEC_INFINITY, | |
392 | .original_pid = getpid_cached(), | |
393 | }; | |
fd38203a | 394 | |
c983e776 EV |
395 | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
396 | if (r < 0) | |
fd38203a | 397 | goto fail; |
fd38203a LP |
398 | |
399 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
400 | if (e->epoll_fd < 0) { | |
401 | r = -errno; | |
402 | goto fail; | |
403 | } | |
404 | ||
7fe2903c LP |
405 | e->epoll_fd = fd_move_above_stdio(e->epoll_fd); |
406 | ||
34b87517 | 407 | if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) { |
1d3a473b | 408 | 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 |
409 | e->profile_delays = true; |
410 | } | |
411 | ||
fd38203a LP |
412 | *ret = e; |
413 | return 0; | |
414 | ||
415 | fail: | |
416 | event_free(e); | |
417 | return r; | |
418 | } | |
419 | ||
8301aa0b | 420 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_event, sd_event, event_free); |
fd38203a | 421 | |
afd15bbb ZJS |
422 | _public_ sd_event_source* sd_event_source_disable_unref(sd_event_source *s) { |
423 | if (s) | |
424 | (void) sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
425 | return sd_event_source_unref(s); | |
426 | } | |
427 | ||
eaa3cbef LP |
428 | static bool event_pid_changed(sd_event *e) { |
429 | assert(e); | |
430 | ||
a2360a46 | 431 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
432 | * it around over a fork(). Let's complain. */ |
433 | ||
df0ff127 | 434 | return e->original_pid != getpid_cached(); |
eaa3cbef LP |
435 | } |
436 | ||
366e6411 | 437 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
438 | assert(s); |
439 | assert(s->type == SOURCE_IO); | |
440 | ||
f6806734 | 441 | if (event_pid_changed(s->event)) |
366e6411 | 442 | return; |
f6806734 | 443 | |
fd38203a | 444 | if (!s->io.registered) |
366e6411 | 445 | return; |
fd38203a | 446 | |
d1cf2023 | 447 | if (epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL) < 0) |
f80a5d6a | 448 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll, ignoring: %m", |
55cbfaa5 | 449 | strna(s->description), event_source_type_to_string(s->type)); |
fd38203a LP |
450 | |
451 | s->io.registered = false; | |
fd38203a LP |
452 | } |
453 | ||
305f78bf LP |
454 | static int source_io_register( |
455 | sd_event_source *s, | |
456 | int enabled, | |
457 | uint32_t events) { | |
458 | ||
fd38203a LP |
459 | assert(s); |
460 | assert(s->type == SOURCE_IO); | |
baf76283 | 461 | assert(enabled != SD_EVENT_OFF); |
fd38203a | 462 | |
1eac7948 | 463 | struct epoll_event ev = { |
a82f89aa LP |
464 | .events = events | (enabled == SD_EVENT_ONESHOT ? EPOLLONESHOT : 0), |
465 | .data.ptr = s, | |
466 | }; | |
fd38203a | 467 | |
15c689d7 | 468 | if (epoll_ctl(s->event->epoll_fd, |
1eac7948 | 469 | s->io.registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD, |
55c540d3 | 470 | s->io.fd, &ev) < 0) |
fd38203a LP |
471 | return -errno; |
472 | ||
473 | s->io.registered = true; | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
f8f3f926 LP |
478 | static void source_child_pidfd_unregister(sd_event_source *s) { |
479 | assert(s); | |
480 | assert(s->type == SOURCE_CHILD); | |
481 | ||
482 | if (event_pid_changed(s->event)) | |
483 | return; | |
484 | ||
485 | if (!s->child.registered) | |
486 | return; | |
487 | ||
488 | if (EVENT_SOURCE_WATCH_PIDFD(s)) | |
489 | if (epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->child.pidfd, NULL) < 0) | |
f80a5d6a | 490 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll, ignoring: %m", |
f8f3f926 LP |
491 | strna(s->description), event_source_type_to_string(s->type)); |
492 | ||
493 | s->child.registered = false; | |
494 | } | |
495 | ||
496 | static int source_child_pidfd_register(sd_event_source *s, int enabled) { | |
f8f3f926 LP |
497 | assert(s); |
498 | assert(s->type == SOURCE_CHILD); | |
499 | assert(enabled != SD_EVENT_OFF); | |
500 | ||
501 | if (EVENT_SOURCE_WATCH_PIDFD(s)) { | |
1eac7948 | 502 | struct epoll_event ev = { |
f8f3f926 LP |
503 | .events = EPOLLIN | (enabled == SD_EVENT_ONESHOT ? EPOLLONESHOT : 0), |
504 | .data.ptr = s, | |
505 | }; | |
506 | ||
55c540d3 ZJS |
507 | if (epoll_ctl(s->event->epoll_fd, |
508 | s->child.registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD, | |
509 | s->child.pidfd, &ev) < 0) | |
f8f3f926 LP |
510 | return -errno; |
511 | } | |
512 | ||
513 | s->child.registered = true; | |
514 | return 0; | |
515 | } | |
516 | ||
6a0f1f6d LP |
517 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
518 | ||
519 | switch (t) { | |
520 | ||
521 | case SOURCE_TIME_REALTIME: | |
522 | return CLOCK_REALTIME; | |
523 | ||
a8548816 TG |
524 | case SOURCE_TIME_BOOTTIME: |
525 | return CLOCK_BOOTTIME; | |
526 | ||
6a0f1f6d LP |
527 | case SOURCE_TIME_MONOTONIC: |
528 | return CLOCK_MONOTONIC; | |
529 | ||
530 | case SOURCE_TIME_REALTIME_ALARM: | |
531 | return CLOCK_REALTIME_ALARM; | |
532 | ||
533 | case SOURCE_TIME_BOOTTIME_ALARM: | |
534 | return CLOCK_BOOTTIME_ALARM; | |
535 | ||
536 | default: | |
537 | return (clockid_t) -1; | |
538 | } | |
539 | } | |
540 | ||
541 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
542 | ||
543 | switch (clock) { | |
544 | ||
545 | case CLOCK_REALTIME: | |
546 | return SOURCE_TIME_REALTIME; | |
547 | ||
a8548816 TG |
548 | case CLOCK_BOOTTIME: |
549 | return SOURCE_TIME_BOOTTIME; | |
550 | ||
6a0f1f6d LP |
551 | case CLOCK_MONOTONIC: |
552 | return SOURCE_TIME_MONOTONIC; | |
553 | ||
554 | case CLOCK_REALTIME_ALARM: | |
555 | return SOURCE_TIME_REALTIME_ALARM; | |
556 | ||
557 | case CLOCK_BOOTTIME_ALARM: | |
558 | return SOURCE_TIME_BOOTTIME_ALARM; | |
559 | ||
560 | default: | |
561 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
562 | } | |
563 | } | |
564 | ||
565 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
566 | assert(e); | |
567 | ||
568 | switch (t) { | |
569 | ||
570 | case SOURCE_TIME_REALTIME: | |
571 | return &e->realtime; | |
572 | ||
a8548816 TG |
573 | case SOURCE_TIME_BOOTTIME: |
574 | return &e->boottime; | |
575 | ||
6a0f1f6d LP |
576 | case SOURCE_TIME_MONOTONIC: |
577 | return &e->monotonic; | |
578 | ||
579 | case SOURCE_TIME_REALTIME_ALARM: | |
580 | return &e->realtime_alarm; | |
581 | ||
582 | case SOURCE_TIME_BOOTTIME_ALARM: | |
583 | return &e->boottime_alarm; | |
584 | ||
585 | default: | |
586 | return NULL; | |
587 | } | |
588 | } | |
589 | ||
3e4eb8e7 YW |
590 | static void event_free_signal_data(sd_event *e, struct signal_data *d) { |
591 | assert(e); | |
592 | ||
593 | if (!d) | |
594 | return; | |
595 | ||
596 | hashmap_remove(e->signal_data, &d->priority); | |
597 | safe_close(d->fd); | |
598 | free(d); | |
599 | } | |
600 | ||
9da4cb2b LP |
601 | static int event_make_signal_data( |
602 | sd_event *e, | |
603 | int sig, | |
604 | struct signal_data **ret) { | |
4807d2d0 | 605 | |
9da4cb2b LP |
606 | struct signal_data *d; |
607 | bool added = false; | |
608 | sigset_t ss_copy; | |
609 | int64_t priority; | |
f95387cd ZJS |
610 | int r; |
611 | ||
612 | assert(e); | |
613 | ||
f6806734 | 614 | if (event_pid_changed(e)) |
9da4cb2b | 615 | return -ECHILD; |
f6806734 | 616 | |
9da4cb2b LP |
617 | if (e->signal_sources && e->signal_sources[sig]) |
618 | priority = e->signal_sources[sig]->priority; | |
619 | else | |
de05913d | 620 | priority = SD_EVENT_PRIORITY_NORMAL; |
f95387cd | 621 | |
9da4cb2b LP |
622 | d = hashmap_get(e->signal_data, &priority); |
623 | if (d) { | |
624 | if (sigismember(&d->sigset, sig) > 0) { | |
625 | if (ret) | |
626 | *ret = d; | |
627 | return 0; | |
628 | } | |
629 | } else { | |
d08eb1fa | 630 | d = new(struct signal_data, 1); |
9da4cb2b LP |
631 | if (!d) |
632 | return -ENOMEM; | |
633 | ||
d08eb1fa LP |
634 | *d = (struct signal_data) { |
635 | .wakeup = WAKEUP_SIGNAL_DATA, | |
636 | .fd = -1, | |
637 | .priority = priority, | |
638 | }; | |
9da4cb2b | 639 | |
f656fdb6 | 640 | r = hashmap_ensure_put(&e->signal_data, &uint64_hash_ops, &d->priority, d); |
90f604d1 ZJS |
641 | if (r < 0) { |
642 | free(d); | |
9da4cb2b | 643 | return r; |
90f604d1 | 644 | } |
f95387cd | 645 | |
9da4cb2b LP |
646 | added = true; |
647 | } | |
648 | ||
649 | ss_copy = d->sigset; | |
650 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
651 | ||
652 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
653 | if (r < 0) { | |
654 | r = -errno; | |
655 | goto fail; | |
656 | } | |
657 | ||
658 | d->sigset = ss_copy; | |
f95387cd | 659 | |
9da4cb2b LP |
660 | if (d->fd >= 0) { |
661 | if (ret) | |
662 | *ret = d; | |
f95387cd | 663 | return 0; |
9da4cb2b LP |
664 | } |
665 | ||
7fe2903c | 666 | d->fd = fd_move_above_stdio(r); |
f95387cd | 667 | |
1eac7948 | 668 | struct epoll_event ev = { |
a82f89aa LP |
669 | .events = EPOLLIN, |
670 | .data.ptr = d, | |
671 | }; | |
f95387cd | 672 | |
15c689d7 | 673 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev) < 0) { |
9da4cb2b LP |
674 | r = -errno; |
675 | goto fail; | |
f95387cd ZJS |
676 | } |
677 | ||
9da4cb2b LP |
678 | if (ret) |
679 | *ret = d; | |
680 | ||
f95387cd | 681 | return 0; |
9da4cb2b LP |
682 | |
683 | fail: | |
3e4eb8e7 YW |
684 | if (added) |
685 | event_free_signal_data(e, d); | |
9da4cb2b LP |
686 | |
687 | return r; | |
688 | } | |
689 | ||
690 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
691 | assert(e); | |
692 | assert(d); | |
693 | ||
694 | /* Turns off the specified signal in the signal data | |
695 | * object. If the signal mask of the object becomes empty that | |
696 | * way removes it. */ | |
697 | ||
698 | if (sigismember(&d->sigset, sig) == 0) | |
699 | return; | |
700 | ||
701 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
702 | ||
703 | if (sigisemptyset(&d->sigset)) { | |
9da4cb2b | 704 | /* If all the mask is all-zero we can get rid of the structure */ |
3e4eb8e7 | 705 | event_free_signal_data(e, d); |
9da4cb2b LP |
706 | return; |
707 | } | |
708 | ||
709 | assert(d->fd >= 0); | |
710 | ||
711 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
712 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
713 | } | |
714 | ||
715 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
716 | struct signal_data *d; | |
717 | static const int64_t zero_priority = 0; | |
718 | ||
719 | assert(e); | |
720 | ||
f8f3f926 LP |
721 | /* Rechecks if the specified signal is still something we are interested in. If not, we'll unmask it, |
722 | * and possibly drop the signalfd for it. */ | |
9da4cb2b LP |
723 | |
724 | if (sig == SIGCHLD && | |
b6d5481b | 725 | e->n_online_child_sources > 0) |
9da4cb2b LP |
726 | return; |
727 | ||
728 | if (e->signal_sources && | |
729 | e->signal_sources[sig] && | |
b6d5481b | 730 | event_source_is_online(e->signal_sources[sig])) |
9da4cb2b LP |
731 | return; |
732 | ||
733 | /* | |
734 | * The specified signal might be enabled in three different queues: | |
735 | * | |
736 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
737 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
738 | * 3) the 0 priority (to cover the SIGCHLD case) | |
739 | * | |
740 | * Hence, let's remove it from all three here. | |
741 | */ | |
742 | ||
743 | if (priority) { | |
744 | d = hashmap_get(e->signal_data, priority); | |
745 | if (d) | |
746 | event_unmask_signal_data(e, d, sig); | |
747 | } | |
748 | ||
749 | if (e->signal_sources && e->signal_sources[sig]) { | |
750 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
751 | if (d) | |
752 | event_unmask_signal_data(e, d, sig); | |
753 | } | |
754 | ||
755 | d = hashmap_get(e->signal_data, &zero_priority); | |
756 | if (d) | |
757 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
758 | } |
759 | ||
e1951c16 MS |
760 | static void event_source_pp_prioq_reshuffle(sd_event_source *s) { |
761 | assert(s); | |
762 | ||
763 | /* Reshuffles the pending + prepare prioqs. Called whenever the dispatch order changes, i.e. when | |
764 | * they are enabled/disabled or marked pending and such. */ | |
765 | ||
766 | if (s->pending) | |
767 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
768 | ||
769 | if (s->prepare) | |
770 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
771 | } | |
772 | ||
773 | static void event_source_time_prioq_reshuffle(sd_event_source *s) { | |
774 | struct clock_data *d; | |
775 | ||
776 | assert(s); | |
e1951c16 MS |
777 | |
778 | /* Called whenever the event source's timer ordering properties changed, i.e. time, accuracy, | |
5c08c7ab YW |
779 | * pending, enable state, and ratelimiting state. Makes sure the two prioq's are ordered |
780 | * properly again. */ | |
b6d5481b LP |
781 | |
782 | if (s->ratelimited) | |
783 | d = &s->event->monotonic; | |
5c08c7ab | 784 | else if (EVENT_SOURCE_IS_TIME(s->type)) |
b6d5481b | 785 | assert_se(d = event_get_clock_data(s->event, s->type)); |
5c08c7ab YW |
786 | else |
787 | return; /* no-op for an event source which is neither a timer nor ratelimited. */ | |
b6d5481b | 788 | |
f41315fc LP |
789 | prioq_reshuffle(d->earliest, s, &s->earliest_index); |
790 | prioq_reshuffle(d->latest, s, &s->latest_index); | |
e1951c16 MS |
791 | d->needs_rearm = true; |
792 | } | |
793 | ||
1e45e3fe LP |
794 | static void event_source_time_prioq_remove( |
795 | sd_event_source *s, | |
796 | struct clock_data *d) { | |
797 | ||
798 | assert(s); | |
799 | assert(d); | |
800 | ||
f41315fc LP |
801 | prioq_remove(d->earliest, s, &s->earliest_index); |
802 | prioq_remove(d->latest, s, &s->latest_index); | |
803 | s->earliest_index = s->latest_index = PRIOQ_IDX_NULL; | |
1e45e3fe LP |
804 | d->needs_rearm = true; |
805 | } | |
806 | ||
a71fe8b8 LP |
807 | static void source_disconnect(sd_event_source *s) { |
808 | sd_event *event; | |
809 | ||
fd38203a LP |
810 | assert(s); |
811 | ||
a71fe8b8 LP |
812 | if (!s->event) |
813 | return; | |
15b38f93 | 814 | |
a71fe8b8 | 815 | assert(s->event->n_sources > 0); |
fd38203a | 816 | |
a71fe8b8 | 817 | switch (s->type) { |
fd38203a | 818 | |
a71fe8b8 LP |
819 | case SOURCE_IO: |
820 | if (s->io.fd >= 0) | |
821 | source_io_unregister(s); | |
fd38203a | 822 | |
a71fe8b8 | 823 | break; |
6a0f1f6d | 824 | |
a71fe8b8 | 825 | case SOURCE_TIME_REALTIME: |
a8548816 | 826 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
827 | case SOURCE_TIME_MONOTONIC: |
828 | case SOURCE_TIME_REALTIME_ALARM: | |
b6d5481b LP |
829 | case SOURCE_TIME_BOOTTIME_ALARM: |
830 | /* Only remove this event source from the time event source here if it is not ratelimited. If | |
831 | * it is ratelimited, we'll remove it below, separately. Why? Because the clock used might | |
832 | * differ: ratelimiting always uses CLOCK_MONOTONIC, but timer events might use any clock */ | |
833 | ||
834 | if (!s->ratelimited) { | |
835 | struct clock_data *d; | |
836 | assert_se(d = event_get_clock_data(s->event, s->type)); | |
837 | event_source_time_prioq_remove(s, d); | |
838 | } | |
839 | ||
a71fe8b8 | 840 | break; |
a71fe8b8 LP |
841 | |
842 | case SOURCE_SIGNAL: | |
843 | if (s->signal.sig > 0) { | |
9da4cb2b | 844 | |
a71fe8b8 LP |
845 | if (s->event->signal_sources) |
846 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 847 | |
9da4cb2b | 848 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 849 | } |
fd38203a | 850 | |
a71fe8b8 | 851 | break; |
fd38203a | 852 | |
a71fe8b8 LP |
853 | case SOURCE_CHILD: |
854 | if (s->child.pid > 0) { | |
b6d5481b LP |
855 | if (event_source_is_online(s)) { |
856 | assert(s->event->n_online_child_sources > 0); | |
857 | s->event->n_online_child_sources--; | |
4807d2d0 | 858 | } |
fd38203a | 859 | |
4a0b58c4 | 860 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
a71fe8b8 | 861 | } |
fd38203a | 862 | |
f8f3f926 LP |
863 | if (EVENT_SOURCE_WATCH_PIDFD(s)) |
864 | source_child_pidfd_unregister(s); | |
865 | else | |
866 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
867 | ||
a71fe8b8 | 868 | break; |
fd38203a | 869 | |
a71fe8b8 LP |
870 | case SOURCE_DEFER: |
871 | /* nothing */ | |
872 | break; | |
fd38203a | 873 | |
a71fe8b8 LP |
874 | case SOURCE_POST: |
875 | set_remove(s->event->post_sources, s); | |
876 | break; | |
da7e457c | 877 | |
a71fe8b8 LP |
878 | case SOURCE_EXIT: |
879 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
880 | break; | |
0eb2e0e3 | 881 | |
97ef5391 LP |
882 | case SOURCE_INOTIFY: { |
883 | struct inode_data *inode_data; | |
884 | ||
885 | inode_data = s->inotify.inode_data; | |
886 | if (inode_data) { | |
887 | struct inotify_data *inotify_data; | |
888 | assert_se(inotify_data = inode_data->inotify_data); | |
889 | ||
890 | /* Detach this event source from the inode object */ | |
891 | LIST_REMOVE(inotify.by_inode_data, inode_data->event_sources, s); | |
892 | s->inotify.inode_data = NULL; | |
893 | ||
894 | if (s->pending) { | |
895 | assert(inotify_data->n_pending > 0); | |
896 | inotify_data->n_pending--; | |
897 | } | |
898 | ||
899 | /* Note that we don't reduce the inotify mask for the watch descriptor here if the inode is | |
900 | * continued to being watched. That's because inotify doesn't really have an API for that: we | |
901 | * can only change watch masks with access to the original inode either by fd or by path. But | |
902 | * paths aren't stable, and keeping an O_PATH fd open all the time would mean wasting an fd | |
f21f31b2 | 903 | * continuously and keeping the mount busy which we can't really do. We could reconstruct the |
97ef5391 LP |
904 | * original inode from /proc/self/fdinfo/$INOTIFY_FD (as all watch descriptors are listed |
905 | * there), but given the need for open_by_handle_at() which is privileged and not universally | |
906 | * available this would be quite an incomplete solution. Hence we go the other way, leave the | |
907 | * mask set, even if it is not minimized now, and ignore all events we aren't interested in | |
908 | * anymore after reception. Yes, this sucks, but … Linux … */ | |
909 | ||
910 | /* Maybe release the inode data (and its inotify) */ | |
911 | event_gc_inode_data(s->event, inode_data); | |
912 | } | |
913 | ||
914 | break; | |
915 | } | |
916 | ||
a71fe8b8 | 917 | default: |
04499a70 | 918 | assert_not_reached(); |
a71fe8b8 | 919 | } |
6e9feda3 | 920 | |
a71fe8b8 LP |
921 | if (s->pending) |
922 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 923 | |
a71fe8b8 LP |
924 | if (s->prepare) |
925 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 926 | |
b6d5481b LP |
927 | if (s->ratelimited) |
928 | event_source_time_prioq_remove(s, &s->event->monotonic); | |
929 | ||
e514aa1e | 930 | event = TAKE_PTR(s->event); |
a71fe8b8 LP |
931 | LIST_REMOVE(sources, event->sources, s); |
932 | event->n_sources--; | |
fd38203a | 933 | |
f5982559 LP |
934 | /* Note that we don't invalidate the type here, since we still need it in order to close the fd or |
935 | * pidfd associated with this event source, which we'll do only on source_free(). */ | |
936 | ||
a71fe8b8 LP |
937 | if (!s->floating) |
938 | sd_event_unref(event); | |
939 | } | |
940 | ||
75db809a | 941 | static sd_event_source* source_free(sd_event_source *s) { |
a71fe8b8 | 942 | assert(s); |
fd38203a | 943 | |
a71fe8b8 | 944 | source_disconnect(s); |
ab93297c NM |
945 | |
946 | if (s->type == SOURCE_IO && s->io.owned) | |
15723a1d LP |
947 | s->io.fd = safe_close(s->io.fd); |
948 | ||
f8f3f926 LP |
949 | if (s->type == SOURCE_CHILD) { |
950 | /* Eventually the kernel will do this automatically for us, but for now let's emulate this (unreliably) in userspace. */ | |
951 | ||
952 | if (s->child.process_owned) { | |
953 | ||
954 | if (!s->child.exited) { | |
955 | bool sent = false; | |
956 | ||
957 | if (s->child.pidfd >= 0) { | |
958 | if (pidfd_send_signal(s->child.pidfd, SIGKILL, NULL, 0) < 0) { | |
959 | if (errno == ESRCH) /* Already dead */ | |
960 | sent = true; | |
961 | else if (!ERRNO_IS_NOT_SUPPORTED(errno)) | |
962 | log_debug_errno(errno, "Failed to kill process " PID_FMT " via pidfd_send_signal(), re-trying via kill(): %m", | |
963 | s->child.pid); | |
964 | } else | |
965 | sent = true; | |
966 | } | |
967 | ||
968 | if (!sent) | |
969 | if (kill(s->child.pid, SIGKILL) < 0) | |
970 | if (errno != ESRCH) /* Already dead */ | |
971 | log_debug_errno(errno, "Failed to kill process " PID_FMT " via kill(), ignoring: %m", | |
972 | s->child.pid); | |
973 | } | |
974 | ||
975 | if (!s->child.waited) { | |
976 | siginfo_t si = {}; | |
977 | ||
978 | /* Reap the child if we can */ | |
979 | (void) waitid(P_PID, s->child.pid, &si, WEXITED); | |
980 | } | |
981 | } | |
982 | ||
983 | if (s->child.pidfd_owned) | |
984 | s->child.pidfd = safe_close(s->child.pidfd); | |
985 | } | |
986 | ||
15723a1d LP |
987 | if (s->destroy_callback) |
988 | s->destroy_callback(s->userdata); | |
ab93297c | 989 | |
356779df | 990 | free(s->description); |
75db809a | 991 | return mfree(s); |
fd38203a | 992 | } |
8c75fe17 | 993 | DEFINE_TRIVIAL_CLEANUP_FUNC(sd_event_source*, source_free); |
fd38203a LP |
994 | |
995 | static int source_set_pending(sd_event_source *s, bool b) { | |
996 | int r; | |
997 | ||
998 | assert(s); | |
6203e07a | 999 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
1000 | |
1001 | if (s->pending == b) | |
1002 | return 0; | |
1003 | ||
1004 | s->pending = b; | |
1005 | ||
1006 | if (b) { | |
1007 | s->pending_iteration = s->event->iteration; | |
1008 | ||
1009 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
1010 | if (r < 0) { | |
1011 | s->pending = false; | |
1012 | return r; | |
1013 | } | |
1014 | } else | |
1015 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
1016 | ||
e1951c16 MS |
1017 | if (EVENT_SOURCE_IS_TIME(s->type)) |
1018 | event_source_time_prioq_reshuffle(s); | |
2576a19e | 1019 | |
9da4cb2b LP |
1020 | if (s->type == SOURCE_SIGNAL && !b) { |
1021 | struct signal_data *d; | |
1022 | ||
1023 | d = hashmap_get(s->event->signal_data, &s->priority); | |
1024 | if (d && d->current == s) | |
1025 | d->current = NULL; | |
1026 | } | |
1027 | ||
97ef5391 LP |
1028 | if (s->type == SOURCE_INOTIFY) { |
1029 | ||
1030 | assert(s->inotify.inode_data); | |
1031 | assert(s->inotify.inode_data->inotify_data); | |
1032 | ||
1033 | if (b) | |
1034 | s->inotify.inode_data->inotify_data->n_pending ++; | |
1035 | else { | |
1036 | assert(s->inotify.inode_data->inotify_data->n_pending > 0); | |
1037 | s->inotify.inode_data->inotify_data->n_pending --; | |
1038 | } | |
1039 | } | |
1040 | ||
efd3be9d | 1041 | return 1; |
fd38203a LP |
1042 | } |
1043 | ||
a71fe8b8 | 1044 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
1045 | sd_event_source *s; |
1046 | ||
1047 | assert(e); | |
1048 | ||
d08eb1fa | 1049 | s = new(sd_event_source, 1); |
fd38203a LP |
1050 | if (!s) |
1051 | return NULL; | |
1052 | ||
d08eb1fa LP |
1053 | *s = (struct sd_event_source) { |
1054 | .n_ref = 1, | |
1055 | .event = e, | |
1056 | .floating = floating, | |
1057 | .type = type, | |
1058 | .pending_index = PRIOQ_IDX_NULL, | |
1059 | .prepare_index = PRIOQ_IDX_NULL, | |
1060 | }; | |
a71fe8b8 LP |
1061 | |
1062 | if (!floating) | |
1063 | sd_event_ref(e); | |
fd38203a | 1064 | |
a71fe8b8 | 1065 | LIST_PREPEND(sources, e->sources, s); |
313cefa1 | 1066 | e->n_sources++; |
15b38f93 | 1067 | |
fd38203a LP |
1068 | return s; |
1069 | } | |
1070 | ||
b9350e70 LP |
1071 | static int io_exit_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
1072 | assert(s); | |
1073 | ||
1074 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1075 | } | |
1076 | ||
f7262a9f | 1077 | _public_ int sd_event_add_io( |
fd38203a | 1078 | sd_event *e, |
151b9b96 | 1079 | sd_event_source **ret, |
fd38203a LP |
1080 | int fd, |
1081 | uint32_t events, | |
718db961 | 1082 | sd_event_io_handler_t callback, |
151b9b96 | 1083 | void *userdata) { |
fd38203a | 1084 | |
ec766a51 | 1085 | _cleanup_(source_freep) sd_event_source *s = NULL; |
fd38203a LP |
1086 | int r; |
1087 | ||
305f78bf | 1088 | assert_return(e, -EINVAL); |
b937d761 | 1089 | assert_return(e = event_resolve(e), -ENOPKG); |
8ac43fee | 1090 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 1091 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1092 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1093 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1094 | |
b9350e70 LP |
1095 | if (!callback) |
1096 | callback = io_exit_callback; | |
1097 | ||
a71fe8b8 | 1098 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
1099 | if (!s) |
1100 | return -ENOMEM; | |
1101 | ||
9da4cb2b | 1102 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
1103 | s->io.fd = fd; |
1104 | s->io.events = events; | |
1105 | s->io.callback = callback; | |
1106 | s->userdata = userdata; | |
baf76283 | 1107 | s->enabled = SD_EVENT_ON; |
fd38203a | 1108 | |
baf76283 | 1109 | r = source_io_register(s, s->enabled, events); |
ec766a51 | 1110 | if (r < 0) |
050f74f2 | 1111 | return r; |
fd38203a | 1112 | |
a71fe8b8 LP |
1113 | if (ret) |
1114 | *ret = s; | |
ec766a51 | 1115 | TAKE_PTR(s); |
a71fe8b8 | 1116 | |
fd38203a LP |
1117 | return 0; |
1118 | } | |
1119 | ||
52444dc4 LP |
1120 | static void initialize_perturb(sd_event *e) { |
1121 | sd_id128_t bootid = {}; | |
1122 | ||
1123 | /* When we sleep for longer, we try to realign the wakeup to | |
f21f31b2 | 1124 | the same time within each minute/second/250ms, so that |
52444dc4 LP |
1125 | events all across the system can be coalesced into a single |
1126 | CPU wakeup. However, let's take some system-specific | |
1127 | randomness for this value, so that in a network of systems | |
1128 | with synced clocks timer events are distributed a | |
1129 | bit. Here, we calculate a perturbation usec offset from the | |
1130 | boot ID. */ | |
1131 | ||
3a43da28 | 1132 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
1133 | return; |
1134 | ||
1135 | if (sd_id128_get_boot(&bootid) >= 0) | |
1136 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
1137 | } | |
1138 | ||
fd38203a LP |
1139 | static int event_setup_timer_fd( |
1140 | sd_event *e, | |
6a0f1f6d LP |
1141 | struct clock_data *d, |
1142 | clockid_t clock) { | |
fd38203a | 1143 | |
fd38203a | 1144 | assert(e); |
6a0f1f6d | 1145 | assert(d); |
fd38203a | 1146 | |
6a0f1f6d | 1147 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
1148 | return 0; |
1149 | ||
b44d87e2 | 1150 | _cleanup_close_ int fd = -1; |
b44d87e2 | 1151 | |
6a0f1f6d | 1152 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
1153 | if (fd < 0) |
1154 | return -errno; | |
1155 | ||
7fe2903c LP |
1156 | fd = fd_move_above_stdio(fd); |
1157 | ||
1eac7948 | 1158 | struct epoll_event ev = { |
a82f89aa LP |
1159 | .events = EPOLLIN, |
1160 | .data.ptr = d, | |
1161 | }; | |
fd38203a | 1162 | |
15c689d7 | 1163 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) |
fd38203a | 1164 | return -errno; |
fd38203a | 1165 | |
b44d87e2 | 1166 | d->fd = TAKE_FD(fd); |
fd38203a LP |
1167 | return 0; |
1168 | } | |
1169 | ||
c4f1aff2 TG |
1170 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1171 | assert(s); | |
1172 | ||
1173 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1174 | } | |
1175 | ||
41c63f36 LP |
1176 | static int setup_clock_data(sd_event *e, struct clock_data *d, clockid_t clock) { |
1177 | int r; | |
1178 | ||
1179 | assert(d); | |
1180 | ||
1181 | if (d->fd < 0) { | |
1182 | r = event_setup_timer_fd(e, d, clock); | |
1183 | if (r < 0) | |
1184 | return r; | |
1185 | } | |
1186 | ||
1187 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); | |
1188 | if (r < 0) | |
1189 | return r; | |
1190 | ||
1191 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); | |
1192 | if (r < 0) | |
1193 | return r; | |
1194 | ||
1195 | return 0; | |
1196 | } | |
1197 | ||
1e45e3fe LP |
1198 | static int event_source_time_prioq_put( |
1199 | sd_event_source *s, | |
1200 | struct clock_data *d) { | |
1201 | ||
1202 | int r; | |
1203 | ||
1204 | assert(s); | |
1205 | assert(d); | |
19947509 | 1206 | assert(EVENT_SOURCE_USES_TIME_PRIOQ(s->type)); |
1e45e3fe | 1207 | |
f41315fc | 1208 | r = prioq_put(d->earliest, s, &s->earliest_index); |
1e45e3fe LP |
1209 | if (r < 0) |
1210 | return r; | |
1211 | ||
f41315fc | 1212 | r = prioq_put(d->latest, s, &s->latest_index); |
1e45e3fe | 1213 | if (r < 0) { |
f41315fc LP |
1214 | assert_se(prioq_remove(d->earliest, s, &s->earliest_index) > 0); |
1215 | s->earliest_index = PRIOQ_IDX_NULL; | |
1e45e3fe LP |
1216 | return r; |
1217 | } | |
1218 | ||
1219 | d->needs_rearm = true; | |
1220 | return 0; | |
1221 | } | |
1222 | ||
6a0f1f6d | 1223 | _public_ int sd_event_add_time( |
fd38203a | 1224 | sd_event *e, |
151b9b96 | 1225 | sd_event_source **ret, |
6a0f1f6d | 1226 | clockid_t clock, |
fd38203a | 1227 | uint64_t usec, |
c2ba3ad6 | 1228 | uint64_t accuracy, |
718db961 | 1229 | sd_event_time_handler_t callback, |
151b9b96 | 1230 | void *userdata) { |
fd38203a | 1231 | |
6a0f1f6d | 1232 | EventSourceType type; |
ec766a51 | 1233 | _cleanup_(source_freep) sd_event_source *s = NULL; |
6a0f1f6d | 1234 | struct clock_data *d; |
fd38203a LP |
1235 | int r; |
1236 | ||
305f78bf | 1237 | assert_return(e, -EINVAL); |
b937d761 | 1238 | assert_return(e = event_resolve(e), -ENOPKG); |
f5fbe71d | 1239 | assert_return(accuracy != UINT64_MAX, -EINVAL); |
da7e457c | 1240 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1241 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1242 | |
e475d10c LP |
1243 | if (!clock_supported(clock)) /* Checks whether the kernel supports the clock */ |
1244 | return -EOPNOTSUPP; | |
1245 | ||
1246 | type = clock_to_event_source_type(clock); /* checks whether sd-event supports this clock */ | |
1247 | if (type < 0) | |
3411372e LP |
1248 | return -EOPNOTSUPP; |
1249 | ||
c4f1aff2 TG |
1250 | if (!callback) |
1251 | callback = time_exit_callback; | |
1252 | ||
1e45e3fe | 1253 | assert_se(d = event_get_clock_data(e, type)); |
c2ba3ad6 | 1254 | |
41c63f36 | 1255 | r = setup_clock_data(e, d, clock); |
c983e776 EV |
1256 | if (r < 0) |
1257 | return r; | |
fd38203a | 1258 | |
a71fe8b8 | 1259 | s = source_new(e, !ret, type); |
fd38203a LP |
1260 | if (!s) |
1261 | return -ENOMEM; | |
1262 | ||
1263 | s->time.next = usec; | |
c2ba3ad6 | 1264 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1265 | s->time.callback = callback; |
f41315fc | 1266 | s->earliest_index = s->latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1267 | s->userdata = userdata; |
baf76283 | 1268 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1269 | |
1e45e3fe | 1270 | r = event_source_time_prioq_put(s, d); |
c2ba3ad6 | 1271 | if (r < 0) |
ec766a51 | 1272 | return r; |
fd38203a | 1273 | |
a71fe8b8 LP |
1274 | if (ret) |
1275 | *ret = s; | |
ec766a51 | 1276 | TAKE_PTR(s); |
a71fe8b8 | 1277 | |
fd38203a LP |
1278 | return 0; |
1279 | } | |
1280 | ||
d6a83dc4 LP |
1281 | _public_ int sd_event_add_time_relative( |
1282 | sd_event *e, | |
1283 | sd_event_source **ret, | |
1284 | clockid_t clock, | |
1285 | uint64_t usec, | |
1286 | uint64_t accuracy, | |
1287 | sd_event_time_handler_t callback, | |
1288 | void *userdata) { | |
1289 | ||
1290 | usec_t t; | |
1291 | int r; | |
1292 | ||
1293 | /* Same as sd_event_add_time() but operates relative to the event loop's current point in time, and | |
1294 | * checks for overflow. */ | |
1295 | ||
1296 | r = sd_event_now(e, clock, &t); | |
1297 | if (r < 0) | |
1298 | return r; | |
1299 | ||
1300 | if (usec >= USEC_INFINITY - t) | |
1301 | return -EOVERFLOW; | |
1302 | ||
1303 | return sd_event_add_time(e, ret, clock, t + usec, accuracy, callback, userdata); | |
1304 | } | |
1305 | ||
59bc1fd7 LP |
1306 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1307 | assert(s); | |
1308 | ||
1309 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1310 | } | |
1311 | ||
f7262a9f | 1312 | _public_ int sd_event_add_signal( |
305f78bf | 1313 | sd_event *e, |
151b9b96 | 1314 | sd_event_source **ret, |
305f78bf | 1315 | int sig, |
718db961 | 1316 | sd_event_signal_handler_t callback, |
151b9b96 | 1317 | void *userdata) { |
305f78bf | 1318 | |
ec766a51 | 1319 | _cleanup_(source_freep) sd_event_source *s = NULL; |
9da4cb2b | 1320 | struct signal_data *d; |
fd38203a LP |
1321 | int r; |
1322 | ||
305f78bf | 1323 | assert_return(e, -EINVAL); |
b937d761 | 1324 | assert_return(e = event_resolve(e), -ENOPKG); |
6eb7c172 | 1325 | assert_return(SIGNAL_VALID(sig), -EINVAL); |
da7e457c | 1326 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1327 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1328 | |
59bc1fd7 LP |
1329 | if (!callback) |
1330 | callback = signal_exit_callback; | |
1331 | ||
d1b75241 LP |
1332 | r = signal_is_blocked(sig); |
1333 | if (r < 0) | |
1334 | return r; | |
1335 | if (r == 0) | |
3022d74b LP |
1336 | return -EBUSY; |
1337 | ||
fd38203a LP |
1338 | if (!e->signal_sources) { |
1339 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1340 | if (!e->signal_sources) | |
1341 | return -ENOMEM; | |
1342 | } else if (e->signal_sources[sig]) | |
1343 | return -EBUSY; | |
1344 | ||
a71fe8b8 | 1345 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1346 | if (!s) |
1347 | return -ENOMEM; | |
1348 | ||
1349 | s->signal.sig = sig; | |
1350 | s->signal.callback = callback; | |
1351 | s->userdata = userdata; | |
baf76283 | 1352 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1353 | |
1354 | e->signal_sources[sig] = s; | |
fd38203a | 1355 | |
9da4cb2b | 1356 | r = event_make_signal_data(e, sig, &d); |
ec766a51 | 1357 | if (r < 0) |
9da4cb2b | 1358 | return r; |
fd38203a | 1359 | |
f1f00dbb LP |
1360 | /* Use the signal name as description for the event source by default */ |
1361 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1362 | ||
a71fe8b8 LP |
1363 | if (ret) |
1364 | *ret = s; | |
ec766a51 | 1365 | TAKE_PTR(s); |
a71fe8b8 | 1366 | |
fd38203a LP |
1367 | return 0; |
1368 | } | |
1369 | ||
b9350e70 LP |
1370 | static int child_exit_callback(sd_event_source *s, const siginfo_t *si, void *userdata) { |
1371 | assert(s); | |
1372 | ||
1373 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1374 | } | |
1375 | ||
f8f3f926 LP |
1376 | static bool shall_use_pidfd(void) { |
1377 | /* Mostly relevant for debugging, i.e. this is used in test-event.c to test the event loop once with and once without pidfd */ | |
1378 | return getenv_bool_secure("SYSTEMD_PIDFD") != 0; | |
1379 | } | |
1380 | ||
f7262a9f | 1381 | _public_ int sd_event_add_child( |
305f78bf | 1382 | sd_event *e, |
151b9b96 | 1383 | sd_event_source **ret, |
305f78bf LP |
1384 | pid_t pid, |
1385 | int options, | |
718db961 | 1386 | sd_event_child_handler_t callback, |
151b9b96 | 1387 | void *userdata) { |
305f78bf | 1388 | |
ec766a51 | 1389 | _cleanup_(source_freep) sd_event_source *s = NULL; |
fd38203a LP |
1390 | int r; |
1391 | ||
305f78bf | 1392 | assert_return(e, -EINVAL); |
b937d761 | 1393 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf LP |
1394 | assert_return(pid > 1, -EINVAL); |
1395 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1396 | assert_return(options != 0, -EINVAL); | |
da7e457c | 1397 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1398 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1399 | |
b9350e70 LP |
1400 | if (!callback) |
1401 | callback = child_exit_callback; | |
1402 | ||
b6d5481b | 1403 | if (e->n_online_child_sources == 0) { |
ee880b37 LP |
1404 | /* Caller must block SIGCHLD before using us to watch children, even if pidfd is available, |
1405 | * for compatibility with pre-pidfd and because we don't want the reap the child processes | |
1406 | * ourselves, i.e. call waitid(), and don't want Linux' default internal logic for that to | |
1407 | * take effect. | |
1408 | * | |
1409 | * (As an optimization we only do this check on the first child event source created.) */ | |
1410 | r = signal_is_blocked(SIGCHLD); | |
1411 | if (r < 0) | |
1412 | return r; | |
1413 | if (r == 0) | |
1414 | return -EBUSY; | |
1415 | } | |
1416 | ||
d5099efc | 1417 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1418 | if (r < 0) |
1419 | return r; | |
1420 | ||
4a0b58c4 | 1421 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1422 | return -EBUSY; |
1423 | ||
a71fe8b8 | 1424 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1425 | if (!s) |
1426 | return -ENOMEM; | |
1427 | ||
f8f3f926 | 1428 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
1429 | s->child.pid = pid; |
1430 | s->child.options = options; | |
1431 | s->child.callback = callback; | |
1432 | s->userdata = userdata; | |
baf76283 | 1433 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1434 | |
f8f3f926 LP |
1435 | /* We always take a pidfd here if we can, even if we wait for anything else than WEXITED, so that we |
1436 | * pin the PID, and make regular waitid() handling race-free. */ | |
1437 | ||
1438 | if (shall_use_pidfd()) { | |
1439 | s->child.pidfd = pidfd_open(s->child.pid, 0); | |
1440 | if (s->child.pidfd < 0) { | |
1441 | /* Propagate errors unless the syscall is not supported or blocked */ | |
1442 | if (!ERRNO_IS_NOT_SUPPORTED(errno) && !ERRNO_IS_PRIVILEGE(errno)) | |
1443 | return -errno; | |
1444 | } else | |
1445 | s->child.pidfd_owned = true; /* If we allocate the pidfd we own it by default */ | |
1446 | } else | |
1447 | s->child.pidfd = -1; | |
1448 | ||
4a0b58c4 | 1449 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
ec766a51 | 1450 | if (r < 0) |
fd38203a | 1451 | return r; |
fd38203a | 1452 | |
f8f3f926 LP |
1453 | if (EVENT_SOURCE_WATCH_PIDFD(s)) { |
1454 | /* We have a pidfd and we only want to watch for exit */ | |
f8f3f926 | 1455 | r = source_child_pidfd_register(s, s->enabled); |
ac9f2640 | 1456 | if (r < 0) |
f8f3f926 | 1457 | return r; |
ac9f2640 | 1458 | |
f8f3f926 LP |
1459 | } else { |
1460 | /* We have no pidfd or we shall wait for some other event than WEXITED */ | |
f8f3f926 | 1461 | r = event_make_signal_data(e, SIGCHLD, NULL); |
ac9f2640 | 1462 | if (r < 0) |
f8f3f926 | 1463 | return r; |
f8f3f926 LP |
1464 | |
1465 | e->need_process_child = true; | |
1466 | } | |
c2ba3ad6 | 1467 | |
b6d5481b | 1468 | e->n_online_child_sources++; |
ac9f2640 | 1469 | |
a71fe8b8 LP |
1470 | if (ret) |
1471 | *ret = s; | |
ec766a51 | 1472 | TAKE_PTR(s); |
f8f3f926 LP |
1473 | return 0; |
1474 | } | |
1475 | ||
1476 | _public_ int sd_event_add_child_pidfd( | |
1477 | sd_event *e, | |
1478 | sd_event_source **ret, | |
1479 | int pidfd, | |
1480 | int options, | |
1481 | sd_event_child_handler_t callback, | |
1482 | void *userdata) { | |
1483 | ||
1484 | ||
1485 | _cleanup_(source_freep) sd_event_source *s = NULL; | |
1486 | pid_t pid; | |
1487 | int r; | |
1488 | ||
1489 | assert_return(e, -EINVAL); | |
1490 | assert_return(e = event_resolve(e), -ENOPKG); | |
1491 | assert_return(pidfd >= 0, -EBADF); | |
1492 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1493 | assert_return(options != 0, -EINVAL); | |
f8f3f926 LP |
1494 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1495 | assert_return(!event_pid_changed(e), -ECHILD); | |
1496 | ||
b9350e70 LP |
1497 | if (!callback) |
1498 | callback = child_exit_callback; | |
1499 | ||
b6d5481b | 1500 | if (e->n_online_child_sources == 0) { |
ee880b37 LP |
1501 | r = signal_is_blocked(SIGCHLD); |
1502 | if (r < 0) | |
1503 | return r; | |
1504 | if (r == 0) | |
1505 | return -EBUSY; | |
1506 | } | |
1507 | ||
f8f3f926 LP |
1508 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
1509 | if (r < 0) | |
1510 | return r; | |
1511 | ||
1512 | r = pidfd_get_pid(pidfd, &pid); | |
1513 | if (r < 0) | |
1514 | return r; | |
1515 | ||
1516 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) | |
1517 | return -EBUSY; | |
1518 | ||
1519 | s = source_new(e, !ret, SOURCE_CHILD); | |
1520 | if (!s) | |
1521 | return -ENOMEM; | |
1522 | ||
1523 | s->wakeup = WAKEUP_EVENT_SOURCE; | |
1524 | s->child.pidfd = pidfd; | |
1525 | s->child.pid = pid; | |
1526 | s->child.options = options; | |
1527 | s->child.callback = callback; | |
1528 | s->child.pidfd_owned = false; /* If we got the pidfd passed in we don't own it by default (similar to the IO fd case) */ | |
1529 | s->userdata = userdata; | |
1530 | s->enabled = SD_EVENT_ONESHOT; | |
1531 | ||
1532 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); | |
1533 | if (r < 0) | |
1534 | return r; | |
1535 | ||
f8f3f926 LP |
1536 | if (EVENT_SOURCE_WATCH_PIDFD(s)) { |
1537 | /* We only want to watch for WEXITED */ | |
f8f3f926 | 1538 | r = source_child_pidfd_register(s, s->enabled); |
ac9f2640 | 1539 | if (r < 0) |
f8f3f926 | 1540 | return r; |
f8f3f926 LP |
1541 | } else { |
1542 | /* We shall wait for some other event than WEXITED */ | |
f8f3f926 | 1543 | r = event_make_signal_data(e, SIGCHLD, NULL); |
ac9f2640 | 1544 | if (r < 0) |
f8f3f926 | 1545 | return r; |
a71fe8b8 | 1546 | |
f8f3f926 LP |
1547 | e->need_process_child = true; |
1548 | } | |
1549 | ||
b6d5481b | 1550 | e->n_online_child_sources++; |
ac9f2640 | 1551 | |
f8f3f926 LP |
1552 | if (ret) |
1553 | *ret = s; | |
f8f3f926 | 1554 | TAKE_PTR(s); |
fd38203a LP |
1555 | return 0; |
1556 | } | |
1557 | ||
b9350e70 LP |
1558 | static int generic_exit_callback(sd_event_source *s, void *userdata) { |
1559 | assert(s); | |
1560 | ||
1561 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1562 | } | |
1563 | ||
f7262a9f | 1564 | _public_ int sd_event_add_defer( |
305f78bf | 1565 | sd_event *e, |
151b9b96 | 1566 | sd_event_source **ret, |
718db961 | 1567 | sd_event_handler_t callback, |
151b9b96 | 1568 | void *userdata) { |
305f78bf | 1569 | |
ec766a51 | 1570 | _cleanup_(source_freep) sd_event_source *s = NULL; |
fd38203a LP |
1571 | int r; |
1572 | ||
305f78bf | 1573 | assert_return(e, -EINVAL); |
b937d761 | 1574 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c | 1575 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1576 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1577 | |
b9350e70 LP |
1578 | if (!callback) |
1579 | callback = generic_exit_callback; | |
1580 | ||
a71fe8b8 | 1581 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1582 | if (!s) |
1583 | return -ENOMEM; | |
1584 | ||
1585 | s->defer.callback = callback; | |
1586 | s->userdata = userdata; | |
baf76283 | 1587 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1588 | |
1589 | r = source_set_pending(s, true); | |
ec766a51 | 1590 | if (r < 0) |
fd38203a | 1591 | return r; |
fd38203a | 1592 | |
a71fe8b8 LP |
1593 | if (ret) |
1594 | *ret = s; | |
ec766a51 | 1595 | TAKE_PTR(s); |
a71fe8b8 | 1596 | |
fd38203a LP |
1597 | return 0; |
1598 | } | |
1599 | ||
6e9feda3 LP |
1600 | _public_ int sd_event_add_post( |
1601 | sd_event *e, | |
1602 | sd_event_source **ret, | |
1603 | sd_event_handler_t callback, | |
1604 | void *userdata) { | |
1605 | ||
ec766a51 | 1606 | _cleanup_(source_freep) sd_event_source *s = NULL; |
6e9feda3 LP |
1607 | int r; |
1608 | ||
1609 | assert_return(e, -EINVAL); | |
b937d761 | 1610 | assert_return(e = event_resolve(e), -ENOPKG); |
6e9feda3 LP |
1611 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1612 | assert_return(!event_pid_changed(e), -ECHILD); | |
1613 | ||
b9350e70 LP |
1614 | if (!callback) |
1615 | callback = generic_exit_callback; | |
1616 | ||
a71fe8b8 | 1617 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1618 | if (!s) |
1619 | return -ENOMEM; | |
1620 | ||
1621 | s->post.callback = callback; | |
1622 | s->userdata = userdata; | |
1623 | s->enabled = SD_EVENT_ON; | |
1624 | ||
de7fef4b | 1625 | r = set_ensure_put(&e->post_sources, NULL, s); |
ec766a51 | 1626 | if (r < 0) |
6e9feda3 | 1627 | return r; |
de7fef4b | 1628 | assert(r > 0); |
6e9feda3 | 1629 | |
a71fe8b8 LP |
1630 | if (ret) |
1631 | *ret = s; | |
ec766a51 | 1632 | TAKE_PTR(s); |
a71fe8b8 | 1633 | |
6e9feda3 LP |
1634 | return 0; |
1635 | } | |
1636 | ||
6203e07a | 1637 | _public_ int sd_event_add_exit( |
305f78bf | 1638 | sd_event *e, |
151b9b96 | 1639 | sd_event_source **ret, |
718db961 | 1640 | sd_event_handler_t callback, |
151b9b96 | 1641 | void *userdata) { |
305f78bf | 1642 | |
ec766a51 | 1643 | _cleanup_(source_freep) sd_event_source *s = NULL; |
da7e457c LP |
1644 | int r; |
1645 | ||
1646 | assert_return(e, -EINVAL); | |
b937d761 | 1647 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
1648 | assert_return(callback, -EINVAL); |
1649 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1650 | assert_return(!event_pid_changed(e), -ECHILD); | |
1651 | ||
c983e776 EV |
1652 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1653 | if (r < 0) | |
1654 | return r; | |
da7e457c | 1655 | |
a71fe8b8 | 1656 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1657 | if (!s) |
da7e457c | 1658 | return -ENOMEM; |
fd38203a | 1659 | |
6203e07a | 1660 | s->exit.callback = callback; |
da7e457c | 1661 | s->userdata = userdata; |
6203e07a | 1662 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1663 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1664 | |
6203e07a | 1665 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
ec766a51 | 1666 | if (r < 0) |
da7e457c | 1667 | return r; |
da7e457c | 1668 | |
a71fe8b8 LP |
1669 | if (ret) |
1670 | *ret = s; | |
ec766a51 | 1671 | TAKE_PTR(s); |
a71fe8b8 | 1672 | |
da7e457c LP |
1673 | return 0; |
1674 | } | |
1675 | ||
97ef5391 LP |
1676 | static void event_free_inotify_data(sd_event *e, struct inotify_data *d) { |
1677 | assert(e); | |
1678 | ||
1679 | if (!d) | |
1680 | return; | |
1681 | ||
1682 | assert(hashmap_isempty(d->inodes)); | |
1683 | assert(hashmap_isempty(d->wd)); | |
1684 | ||
1685 | if (d->buffer_filled > 0) | |
1686 | LIST_REMOVE(buffered, e->inotify_data_buffered, d); | |
1687 | ||
1688 | hashmap_free(d->inodes); | |
1689 | hashmap_free(d->wd); | |
1690 | ||
1691 | assert_se(hashmap_remove(e->inotify_data, &d->priority) == d); | |
1692 | ||
1693 | if (d->fd >= 0) { | |
1694 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, d->fd, NULL) < 0) | |
1695 | log_debug_errno(errno, "Failed to remove inotify fd from epoll, ignoring: %m"); | |
1696 | ||
1697 | safe_close(d->fd); | |
1698 | } | |
1699 | free(d); | |
1700 | } | |
1701 | ||
1702 | static int event_make_inotify_data( | |
1703 | sd_event *e, | |
1704 | int64_t priority, | |
1705 | struct inotify_data **ret) { | |
1706 | ||
1707 | _cleanup_close_ int fd = -1; | |
1708 | struct inotify_data *d; | |
97ef5391 LP |
1709 | int r; |
1710 | ||
1711 | assert(e); | |
1712 | ||
1713 | d = hashmap_get(e->inotify_data, &priority); | |
1714 | if (d) { | |
1715 | if (ret) | |
1716 | *ret = d; | |
1717 | return 0; | |
1718 | } | |
1719 | ||
1720 | fd = inotify_init1(IN_NONBLOCK|O_CLOEXEC); | |
1721 | if (fd < 0) | |
1722 | return -errno; | |
1723 | ||
1724 | fd = fd_move_above_stdio(fd); | |
1725 | ||
97ef5391 LP |
1726 | d = new(struct inotify_data, 1); |
1727 | if (!d) | |
1728 | return -ENOMEM; | |
1729 | ||
1730 | *d = (struct inotify_data) { | |
1731 | .wakeup = WAKEUP_INOTIFY_DATA, | |
1732 | .fd = TAKE_FD(fd), | |
1733 | .priority = priority, | |
1734 | }; | |
1735 | ||
c2484a75 | 1736 | r = hashmap_ensure_put(&e->inotify_data, &uint64_hash_ops, &d->priority, d); |
97ef5391 LP |
1737 | if (r < 0) { |
1738 | d->fd = safe_close(d->fd); | |
1739 | free(d); | |
1740 | return r; | |
1741 | } | |
1742 | ||
1eac7948 | 1743 | struct epoll_event ev = { |
97ef5391 LP |
1744 | .events = EPOLLIN, |
1745 | .data.ptr = d, | |
1746 | }; | |
1747 | ||
1748 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev) < 0) { | |
1749 | r = -errno; | |
1750 | d->fd = safe_close(d->fd); /* let's close this ourselves, as event_free_inotify_data() would otherwise | |
1751 | * remove the fd from the epoll first, which we don't want as we couldn't | |
1752 | * add it in the first place. */ | |
1753 | event_free_inotify_data(e, d); | |
1754 | return r; | |
1755 | } | |
1756 | ||
1757 | if (ret) | |
1758 | *ret = d; | |
1759 | ||
1760 | return 1; | |
1761 | } | |
1762 | ||
7a08d314 | 1763 | static int inode_data_compare(const struct inode_data *x, const struct inode_data *y) { |
90c88092 | 1764 | int r; |
97ef5391 LP |
1765 | |
1766 | assert(x); | |
1767 | assert(y); | |
1768 | ||
90c88092 YW |
1769 | r = CMP(x->dev, y->dev); |
1770 | if (r != 0) | |
1771 | return r; | |
97ef5391 | 1772 | |
6dd91b36 | 1773 | return CMP(x->ino, y->ino); |
97ef5391 LP |
1774 | } |
1775 | ||
7a08d314 YW |
1776 | static void inode_data_hash_func(const struct inode_data *d, struct siphash *state) { |
1777 | assert(d); | |
97ef5391 LP |
1778 | |
1779 | siphash24_compress(&d->dev, sizeof(d->dev), state); | |
1780 | siphash24_compress(&d->ino, sizeof(d->ino), state); | |
1781 | } | |
1782 | ||
7a08d314 | 1783 | DEFINE_PRIVATE_HASH_OPS(inode_data_hash_ops, struct inode_data, inode_data_hash_func, inode_data_compare); |
97ef5391 LP |
1784 | |
1785 | static void event_free_inode_data( | |
1786 | sd_event *e, | |
1787 | struct inode_data *d) { | |
1788 | ||
1789 | assert(e); | |
1790 | ||
1791 | if (!d) | |
1792 | return; | |
1793 | ||
1794 | assert(!d->event_sources); | |
1795 | ||
1796 | if (d->fd >= 0) { | |
1797 | LIST_REMOVE(to_close, e->inode_data_to_close, d); | |
1798 | safe_close(d->fd); | |
1799 | } | |
1800 | ||
1801 | if (d->inotify_data) { | |
1802 | ||
1803 | if (d->wd >= 0) { | |
1804 | if (d->inotify_data->fd >= 0) { | |
1805 | /* So here's a problem. At the time this runs the watch descriptor might already be | |
1806 | * invalidated, because an IN_IGNORED event might be queued right the moment we enter | |
1807 | * the syscall. Hence, whenever we get EINVAL, ignore it entirely, since it's a very | |
1808 | * likely case to happen. */ | |
1809 | ||
1810 | if (inotify_rm_watch(d->inotify_data->fd, d->wd) < 0 && errno != EINVAL) | |
1811 | log_debug_errno(errno, "Failed to remove watch descriptor %i from inotify, ignoring: %m", d->wd); | |
1812 | } | |
1813 | ||
1814 | assert_se(hashmap_remove(d->inotify_data->wd, INT_TO_PTR(d->wd)) == d); | |
1815 | } | |
1816 | ||
1817 | assert_se(hashmap_remove(d->inotify_data->inodes, d) == d); | |
1818 | } | |
1819 | ||
1820 | free(d); | |
1821 | } | |
1822 | ||
53baf2ef LP |
1823 | static void event_gc_inotify_data( |
1824 | sd_event *e, | |
1825 | struct inotify_data *d) { | |
1826 | ||
1827 | assert(e); | |
1828 | ||
1829 | /* GCs the inotify data object if we don't need it anymore. That's the case if we don't want to watch | |
1830 | * any inode with it anymore, which in turn happens if no event source of this priority is interested | |
1831 | * in any inode any longer. That said, we maintain an extra busy counter: if non-zero we'll delay GC | |
1832 | * (under the expectation that the GC is called again once the counter is decremented). */ | |
1833 | ||
1834 | if (!d) | |
1835 | return; | |
1836 | ||
1837 | if (!hashmap_isempty(d->inodes)) | |
1838 | return; | |
1839 | ||
1840 | if (d->n_busy > 0) | |
1841 | return; | |
1842 | ||
1843 | event_free_inotify_data(e, d); | |
1844 | } | |
1845 | ||
97ef5391 LP |
1846 | static void event_gc_inode_data( |
1847 | sd_event *e, | |
1848 | struct inode_data *d) { | |
1849 | ||
1850 | struct inotify_data *inotify_data; | |
1851 | ||
1852 | assert(e); | |
1853 | ||
1854 | if (!d) | |
1855 | return; | |
1856 | ||
1857 | if (d->event_sources) | |
1858 | return; | |
1859 | ||
1860 | inotify_data = d->inotify_data; | |
1861 | event_free_inode_data(e, d); | |
1862 | ||
53baf2ef | 1863 | event_gc_inotify_data(e, inotify_data); |
97ef5391 LP |
1864 | } |
1865 | ||
1866 | static int event_make_inode_data( | |
1867 | sd_event *e, | |
1868 | struct inotify_data *inotify_data, | |
1869 | dev_t dev, | |
1870 | ino_t ino, | |
1871 | struct inode_data **ret) { | |
1872 | ||
1873 | struct inode_data *d, key; | |
1874 | int r; | |
1875 | ||
1876 | assert(e); | |
1877 | assert(inotify_data); | |
1878 | ||
1879 | key = (struct inode_data) { | |
1880 | .ino = ino, | |
1881 | .dev = dev, | |
1882 | }; | |
1883 | ||
1884 | d = hashmap_get(inotify_data->inodes, &key); | |
1885 | if (d) { | |
1886 | if (ret) | |
1887 | *ret = d; | |
1888 | ||
1889 | return 0; | |
1890 | } | |
1891 | ||
1892 | r = hashmap_ensure_allocated(&inotify_data->inodes, &inode_data_hash_ops); | |
1893 | if (r < 0) | |
1894 | return r; | |
1895 | ||
1896 | d = new(struct inode_data, 1); | |
1897 | if (!d) | |
1898 | return -ENOMEM; | |
1899 | ||
1900 | *d = (struct inode_data) { | |
1901 | .dev = dev, | |
1902 | .ino = ino, | |
1903 | .wd = -1, | |
1904 | .fd = -1, | |
1905 | .inotify_data = inotify_data, | |
1906 | }; | |
1907 | ||
1908 | r = hashmap_put(inotify_data->inodes, d, d); | |
1909 | if (r < 0) { | |
1910 | free(d); | |
1911 | return r; | |
1912 | } | |
1913 | ||
1914 | if (ret) | |
1915 | *ret = d; | |
1916 | ||
1917 | return 1; | |
1918 | } | |
1919 | ||
1920 | static uint32_t inode_data_determine_mask(struct inode_data *d) { | |
1921 | bool excl_unlink = true; | |
1922 | uint32_t combined = 0; | |
1923 | sd_event_source *s; | |
1924 | ||
1925 | assert(d); | |
1926 | ||
1927 | /* Combines the watch masks of all event sources watching this inode. We generally just OR them together, but | |
1928 | * the IN_EXCL_UNLINK flag is ANDed instead. | |
1929 | * | |
1930 | * Note that we add all sources to the mask here, regardless whether enabled, disabled or oneshot. That's | |
1931 | * because we cannot change the mask anymore after the event source was created once, since the kernel has no | |
f21f31b2 | 1932 | * API for that. Hence we need to subscribe to the maximum mask we ever might be interested in, and suppress |
97ef5391 LP |
1933 | * events we don't care for client-side. */ |
1934 | ||
1935 | LIST_FOREACH(inotify.by_inode_data, s, d->event_sources) { | |
1936 | ||
1937 | if ((s->inotify.mask & IN_EXCL_UNLINK) == 0) | |
1938 | excl_unlink = false; | |
1939 | ||
1940 | combined |= s->inotify.mask; | |
1941 | } | |
1942 | ||
1943 | return (combined & ~(IN_ONESHOT|IN_DONT_FOLLOW|IN_ONLYDIR|IN_EXCL_UNLINK)) | (excl_unlink ? IN_EXCL_UNLINK : 0); | |
1944 | } | |
1945 | ||
1946 | static int inode_data_realize_watch(sd_event *e, struct inode_data *d) { | |
1947 | uint32_t combined_mask; | |
1948 | int wd, r; | |
1949 | ||
1950 | assert(d); | |
1951 | assert(d->fd >= 0); | |
1952 | ||
1953 | combined_mask = inode_data_determine_mask(d); | |
1954 | ||
1955 | if (d->wd >= 0 && combined_mask == d->combined_mask) | |
1956 | return 0; | |
1957 | ||
1958 | r = hashmap_ensure_allocated(&d->inotify_data->wd, NULL); | |
1959 | if (r < 0) | |
1960 | return r; | |
1961 | ||
1962 | wd = inotify_add_watch_fd(d->inotify_data->fd, d->fd, combined_mask); | |
1963 | if (wd < 0) | |
1964 | return -errno; | |
1965 | ||
1966 | if (d->wd < 0) { | |
1967 | r = hashmap_put(d->inotify_data->wd, INT_TO_PTR(wd), d); | |
1968 | if (r < 0) { | |
1969 | (void) inotify_rm_watch(d->inotify_data->fd, wd); | |
1970 | return r; | |
1971 | } | |
1972 | ||
1973 | d->wd = wd; | |
1974 | ||
1975 | } else if (d->wd != wd) { | |
1976 | ||
1977 | log_debug("Weird, the watch descriptor we already knew for this inode changed?"); | |
1978 | (void) inotify_rm_watch(d->fd, wd); | |
1979 | return -EINVAL; | |
1980 | } | |
1981 | ||
1982 | d->combined_mask = combined_mask; | |
1983 | return 1; | |
1984 | } | |
1985 | ||
b9350e70 LP |
1986 | static int inotify_exit_callback(sd_event_source *s, const struct inotify_event *event, void *userdata) { |
1987 | assert(s); | |
1988 | ||
1989 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1990 | } | |
1991 | ||
e67d738a | 1992 | static int event_add_inotify_fd_internal( |
97ef5391 LP |
1993 | sd_event *e, |
1994 | sd_event_source **ret, | |
e67d738a LP |
1995 | int fd, |
1996 | bool donate, | |
97ef5391 LP |
1997 | uint32_t mask, |
1998 | sd_event_inotify_handler_t callback, | |
1999 | void *userdata) { | |
2000 | ||
e67d738a LP |
2001 | _cleanup_close_ int donated_fd = donate ? fd : -1; |
2002 | _cleanup_(source_freep) sd_event_source *s = NULL; | |
97ef5391 LP |
2003 | struct inotify_data *inotify_data = NULL; |
2004 | struct inode_data *inode_data = NULL; | |
97ef5391 LP |
2005 | struct stat st; |
2006 | int r; | |
2007 | ||
2008 | assert_return(e, -EINVAL); | |
2009 | assert_return(e = event_resolve(e), -ENOPKG); | |
e67d738a | 2010 | assert_return(fd >= 0, -EBADF); |
97ef5391 LP |
2011 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
2012 | assert_return(!event_pid_changed(e), -ECHILD); | |
2013 | ||
b9350e70 LP |
2014 | if (!callback) |
2015 | callback = inotify_exit_callback; | |
2016 | ||
97ef5391 LP |
2017 | /* Refuse IN_MASK_ADD since we coalesce watches on the same inode, and hence really don't want to merge |
2018 | * masks. Or in other words, this whole code exists only to manage IN_MASK_ADD type operations for you, hence | |
2019 | * the user can't use them for us. */ | |
2020 | if (mask & IN_MASK_ADD) | |
2021 | return -EINVAL; | |
2022 | ||
97ef5391 LP |
2023 | if (fstat(fd, &st) < 0) |
2024 | return -errno; | |
2025 | ||
2026 | s = source_new(e, !ret, SOURCE_INOTIFY); | |
2027 | if (!s) | |
2028 | return -ENOMEM; | |
2029 | ||
2030 | s->enabled = mask & IN_ONESHOT ? SD_EVENT_ONESHOT : SD_EVENT_ON; | |
2031 | s->inotify.mask = mask; | |
2032 | s->inotify.callback = callback; | |
2033 | s->userdata = userdata; | |
2034 | ||
2035 | /* Allocate an inotify object for this priority, and an inode object within it */ | |
2036 | r = event_make_inotify_data(e, SD_EVENT_PRIORITY_NORMAL, &inotify_data); | |
2037 | if (r < 0) | |
8c75fe17 | 2038 | return r; |
97ef5391 LP |
2039 | |
2040 | r = event_make_inode_data(e, inotify_data, st.st_dev, st.st_ino, &inode_data); | |
8c75fe17 | 2041 | if (r < 0) { |
e67d738a | 2042 | event_gc_inotify_data(e, inotify_data); |
8c75fe17 ZJS |
2043 | return r; |
2044 | } | |
97ef5391 LP |
2045 | |
2046 | /* Keep the O_PATH fd around until the first iteration of the loop, so that we can still change the priority of | |
2047 | * the event source, until then, for which we need the original inode. */ | |
2048 | if (inode_data->fd < 0) { | |
e67d738a LP |
2049 | if (donated_fd >= 0) |
2050 | inode_data->fd = TAKE_FD(donated_fd); | |
2051 | else { | |
2052 | inode_data->fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
2053 | if (inode_data->fd < 0) { | |
2054 | r = -errno; | |
2055 | event_gc_inode_data(e, inode_data); | |
2056 | return r; | |
2057 | } | |
2058 | } | |
2059 | ||
97ef5391 LP |
2060 | LIST_PREPEND(to_close, e->inode_data_to_close, inode_data); |
2061 | } | |
2062 | ||
2063 | /* Link our event source to the inode data object */ | |
2064 | LIST_PREPEND(inotify.by_inode_data, inode_data->event_sources, s); | |
2065 | s->inotify.inode_data = inode_data; | |
2066 | ||
97ef5391 LP |
2067 | /* Actually realize the watch now */ |
2068 | r = inode_data_realize_watch(e, inode_data); | |
2069 | if (r < 0) | |
8c75fe17 | 2070 | return r; |
97ef5391 | 2071 | |
97ef5391 LP |
2072 | if (ret) |
2073 | *ret = s; | |
8c75fe17 | 2074 | TAKE_PTR(s); |
97ef5391 LP |
2075 | |
2076 | return 0; | |
97ef5391 LP |
2077 | } |
2078 | ||
e67d738a LP |
2079 | _public_ int sd_event_add_inotify_fd( |
2080 | sd_event *e, | |
2081 | sd_event_source **ret, | |
2082 | int fd, | |
2083 | uint32_t mask, | |
2084 | sd_event_inotify_handler_t callback, | |
2085 | void *userdata) { | |
2086 | ||
2087 | return event_add_inotify_fd_internal(e, ret, fd, /* donate= */ false, mask, callback, userdata); | |
2088 | } | |
2089 | ||
2090 | _public_ int sd_event_add_inotify( | |
2091 | sd_event *e, | |
2092 | sd_event_source **ret, | |
2093 | const char *path, | |
2094 | uint32_t mask, | |
2095 | sd_event_inotify_handler_t callback, | |
2096 | void *userdata) { | |
2097 | ||
2098 | sd_event_source *s; | |
2099 | int fd, r; | |
2100 | ||
2101 | assert_return(path, -EINVAL); | |
2102 | ||
2103 | fd = open(path, O_PATH|O_CLOEXEC| | |
2104 | (mask & IN_ONLYDIR ? O_DIRECTORY : 0)| | |
2105 | (mask & IN_DONT_FOLLOW ? O_NOFOLLOW : 0)); | |
2106 | if (fd < 0) | |
2107 | return -errno; | |
2108 | ||
2109 | r = event_add_inotify_fd_internal(e, &s, fd, /* donate= */ true, mask, callback, userdata); | |
2110 | if (r < 0) | |
2111 | return r; | |
2112 | ||
2113 | (void) sd_event_source_set_description(s, path); | |
2114 | ||
2115 | if (ret) | |
2116 | *ret = s; | |
2117 | ||
2118 | return r; | |
2119 | } | |
2120 | ||
8301aa0b | 2121 | static sd_event_source* event_source_free(sd_event_source *s) { |
6680dd6b LP |
2122 | if (!s) |
2123 | return NULL; | |
da7e457c | 2124 | |
8301aa0b YW |
2125 | /* Here's a special hack: when we are called from a |
2126 | * dispatch handler we won't free the event source | |
2127 | * immediately, but we will detach the fd from the | |
2128 | * epoll. This way it is safe for the caller to unref | |
2129 | * the event source and immediately close the fd, but | |
2130 | * we still retain a valid event source object after | |
2131 | * the callback. */ | |
fd38203a | 2132 | |
8301aa0b YW |
2133 | if (s->dispatching) { |
2134 | if (s->type == SOURCE_IO) | |
2135 | source_io_unregister(s); | |
fd38203a | 2136 | |
8301aa0b YW |
2137 | source_disconnect(s); |
2138 | } else | |
2139 | source_free(s); | |
fd38203a LP |
2140 | |
2141 | return NULL; | |
2142 | } | |
2143 | ||
8301aa0b YW |
2144 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_event_source, sd_event_source, event_source_free); |
2145 | ||
356779df | 2146 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 2147 | assert_return(s, -EINVAL); |
f4b2933e | 2148 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 2149 | |
356779df | 2150 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
2151 | } |
2152 | ||
356779df | 2153 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 2154 | assert_return(s, -EINVAL); |
356779df | 2155 | assert_return(description, -EINVAL); |
f4b2933e | 2156 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 2157 | |
7d92a1a4 ZJS |
2158 | if (!s->description) |
2159 | return -ENXIO; | |
2160 | ||
356779df | 2161 | *description = s->description; |
f7f53e9e TG |
2162 | return 0; |
2163 | } | |
2164 | ||
adcc4ca3 | 2165 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 2166 | assert_return(s, NULL); |
eaa3cbef LP |
2167 | |
2168 | return s->event; | |
2169 | } | |
2170 | ||
f7262a9f | 2171 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 2172 | assert_return(s, -EINVAL); |
6203e07a | 2173 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 2174 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 2175 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
2176 | |
2177 | return s->pending; | |
2178 | } | |
2179 | ||
f7262a9f | 2180 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
2181 | assert_return(s, -EINVAL); |
2182 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2183 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
2184 | |
2185 | return s->io.fd; | |
2186 | } | |
2187 | ||
30caf8f3 LP |
2188 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
2189 | int r; | |
2190 | ||
2191 | assert_return(s, -EINVAL); | |
8ac43fee | 2192 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
2193 | assert_return(s->type == SOURCE_IO, -EDOM); |
2194 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2195 | ||
2196 | if (s->io.fd == fd) | |
2197 | return 0; | |
2198 | ||
b6d5481b | 2199 | if (event_source_is_offline(s)) { |
30caf8f3 LP |
2200 | s->io.fd = fd; |
2201 | s->io.registered = false; | |
2202 | } else { | |
2203 | int saved_fd; | |
2204 | ||
2205 | saved_fd = s->io.fd; | |
2206 | assert(s->io.registered); | |
2207 | ||
2208 | s->io.fd = fd; | |
2209 | s->io.registered = false; | |
2210 | ||
2211 | r = source_io_register(s, s->enabled, s->io.events); | |
2212 | if (r < 0) { | |
2213 | s->io.fd = saved_fd; | |
2214 | s->io.registered = true; | |
2215 | return r; | |
2216 | } | |
2217 | ||
5a795bff | 2218 | (void) epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); |
30caf8f3 LP |
2219 | } |
2220 | ||
2221 | return 0; | |
2222 | } | |
2223 | ||
ab93297c NM |
2224 | _public_ int sd_event_source_get_io_fd_own(sd_event_source *s) { |
2225 | assert_return(s, -EINVAL); | |
2226 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2227 | ||
2228 | return s->io.owned; | |
2229 | } | |
2230 | ||
2231 | _public_ int sd_event_source_set_io_fd_own(sd_event_source *s, int own) { | |
2232 | assert_return(s, -EINVAL); | |
2233 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2234 | ||
2235 | s->io.owned = own; | |
2236 | return 0; | |
2237 | } | |
2238 | ||
f7262a9f | 2239 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
2240 | assert_return(s, -EINVAL); |
2241 | assert_return(events, -EINVAL); | |
2242 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2243 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
2244 | |
2245 | *events = s->io.events; | |
2246 | return 0; | |
2247 | } | |
2248 | ||
f7262a9f | 2249 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
2250 | int r; |
2251 | ||
305f78bf LP |
2252 | assert_return(s, -EINVAL); |
2253 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 2254 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 2255 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 2256 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 2257 | |
b63c8d4f DH |
2258 | /* edge-triggered updates are never skipped, so we can reset edges */ |
2259 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
2260 | return 0; |
2261 | ||
2a0dc6cd LP |
2262 | r = source_set_pending(s, false); |
2263 | if (r < 0) | |
2264 | return r; | |
2265 | ||
b6d5481b | 2266 | if (event_source_is_online(s)) { |
e4715127 | 2267 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
2268 | if (r < 0) |
2269 | return r; | |
2270 | } | |
2271 | ||
2272 | s->io.events = events; | |
2273 | ||
2274 | return 0; | |
2275 | } | |
2276 | ||
f7262a9f | 2277 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
2278 | assert_return(s, -EINVAL); |
2279 | assert_return(revents, -EINVAL); | |
2280 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2281 | assert_return(s->pending, -ENODATA); | |
2282 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
2283 | |
2284 | *revents = s->io.revents; | |
2285 | return 0; | |
2286 | } | |
2287 | ||
f7262a9f | 2288 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
2289 | assert_return(s, -EINVAL); |
2290 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
2291 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
2292 | |
2293 | return s->signal.sig; | |
2294 | } | |
2295 | ||
31927c16 | 2296 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
2297 | assert_return(s, -EINVAL); |
2298 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 2299 | |
6680b8d1 ME |
2300 | *priority = s->priority; |
2301 | return 0; | |
fd38203a LP |
2302 | } |
2303 | ||
31927c16 | 2304 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
97ef5391 LP |
2305 | bool rm_inotify = false, rm_inode = false; |
2306 | struct inotify_data *new_inotify_data = NULL; | |
2307 | struct inode_data *new_inode_data = NULL; | |
9da4cb2b LP |
2308 | int r; |
2309 | ||
305f78bf | 2310 | assert_return(s, -EINVAL); |
da7e457c | 2311 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 2312 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
2313 | |
2314 | if (s->priority == priority) | |
2315 | return 0; | |
2316 | ||
97ef5391 LP |
2317 | if (s->type == SOURCE_INOTIFY) { |
2318 | struct inode_data *old_inode_data; | |
2319 | ||
2320 | assert(s->inotify.inode_data); | |
2321 | old_inode_data = s->inotify.inode_data; | |
2322 | ||
2323 | /* We need the original fd to change the priority. If we don't have it we can't change the priority, | |
2324 | * anymore. Note that we close any fds when entering the next event loop iteration, i.e. for inotify | |
2325 | * events we allow priority changes only until the first following iteration. */ | |
2326 | if (old_inode_data->fd < 0) | |
2327 | return -EOPNOTSUPP; | |
2328 | ||
2329 | r = event_make_inotify_data(s->event, priority, &new_inotify_data); | |
2330 | if (r < 0) | |
2331 | return r; | |
2332 | rm_inotify = r > 0; | |
2333 | ||
2334 | r = event_make_inode_data(s->event, new_inotify_data, old_inode_data->dev, old_inode_data->ino, &new_inode_data); | |
2335 | if (r < 0) | |
2336 | goto fail; | |
2337 | rm_inode = r > 0; | |
2338 | ||
2339 | if (new_inode_data->fd < 0) { | |
2340 | /* Duplicate the fd for the new inode object if we don't have any yet */ | |
2341 | new_inode_data->fd = fcntl(old_inode_data->fd, F_DUPFD_CLOEXEC, 3); | |
2342 | if (new_inode_data->fd < 0) { | |
2343 | r = -errno; | |
2344 | goto fail; | |
2345 | } | |
2346 | ||
2347 | LIST_PREPEND(to_close, s->event->inode_data_to_close, new_inode_data); | |
2348 | } | |
2349 | ||
2350 | /* Move the event source to the new inode data structure */ | |
2351 | LIST_REMOVE(inotify.by_inode_data, old_inode_data->event_sources, s); | |
2352 | LIST_PREPEND(inotify.by_inode_data, new_inode_data->event_sources, s); | |
2353 | s->inotify.inode_data = new_inode_data; | |
2354 | ||
2355 | /* Now create the new watch */ | |
2356 | r = inode_data_realize_watch(s->event, new_inode_data); | |
2357 | if (r < 0) { | |
2358 | /* Move it back */ | |
2359 | LIST_REMOVE(inotify.by_inode_data, new_inode_data->event_sources, s); | |
2360 | LIST_PREPEND(inotify.by_inode_data, old_inode_data->event_sources, s); | |
2361 | s->inotify.inode_data = old_inode_data; | |
2362 | goto fail; | |
2363 | } | |
2364 | ||
2365 | s->priority = priority; | |
2366 | ||
2367 | event_gc_inode_data(s->event, old_inode_data); | |
2368 | ||
b6d5481b | 2369 | } else if (s->type == SOURCE_SIGNAL && event_source_is_online(s)) { |
9da4cb2b LP |
2370 | struct signal_data *old, *d; |
2371 | ||
2372 | /* Move us from the signalfd belonging to the old | |
2373 | * priority to the signalfd of the new priority */ | |
2374 | ||
2375 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
2376 | ||
2377 | s->priority = priority; | |
2378 | ||
2379 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
2380 | if (r < 0) { | |
2381 | s->priority = old->priority; | |
2382 | return r; | |
2383 | } | |
2384 | ||
2385 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
2386 | } else | |
2387 | s->priority = priority; | |
fd38203a | 2388 | |
e1951c16 | 2389 | event_source_pp_prioq_reshuffle(s); |
fd38203a | 2390 | |
6203e07a LP |
2391 | if (s->type == SOURCE_EXIT) |
2392 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 2393 | |
fd38203a | 2394 | return 0; |
97ef5391 LP |
2395 | |
2396 | fail: | |
2397 | if (rm_inode) | |
2398 | event_free_inode_data(s->event, new_inode_data); | |
2399 | ||
2400 | if (rm_inotify) | |
2401 | event_free_inotify_data(s->event, new_inotify_data); | |
2402 | ||
2403 | return r; | |
fd38203a LP |
2404 | } |
2405 | ||
cad143a8 | 2406 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *ret) { |
305f78bf | 2407 | assert_return(s, -EINVAL); |
305f78bf | 2408 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 2409 | |
cad143a8 LP |
2410 | if (ret) |
2411 | *ret = s->enabled; | |
2412 | ||
08c1eb0e | 2413 | return s->enabled != SD_EVENT_OFF; |
fd38203a LP |
2414 | } |
2415 | ||
b6d5481b LP |
2416 | static int event_source_offline( |
2417 | sd_event_source *s, | |
2418 | int enabled, | |
2419 | bool ratelimited) { | |
2420 | ||
2421 | bool was_offline; | |
fd38203a LP |
2422 | int r; |
2423 | ||
ddfde737 | 2424 | assert(s); |
b6d5481b | 2425 | assert(enabled == SD_EVENT_OFF || ratelimited); |
fd38203a | 2426 | |
ddfde737 | 2427 | /* Unset the pending flag when this event source is disabled */ |
b6d5481b LP |
2428 | if (s->enabled != SD_EVENT_OFF && |
2429 | enabled == SD_EVENT_OFF && | |
2430 | !IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { | |
ddfde737 LP |
2431 | r = source_set_pending(s, false); |
2432 | if (r < 0) | |
2433 | return r; | |
2434 | } | |
cc567911 | 2435 | |
b6d5481b LP |
2436 | was_offline = event_source_is_offline(s); |
2437 | s->enabled = enabled; | |
2438 | s->ratelimited = ratelimited; | |
fd38203a | 2439 | |
ddfde737 | 2440 | switch (s->type) { |
fd38203a | 2441 | |
ddfde737 LP |
2442 | case SOURCE_IO: |
2443 | source_io_unregister(s); | |
2444 | break; | |
ac989a78 | 2445 | |
ddfde737 LP |
2446 | case SOURCE_SIGNAL: |
2447 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
2448 | break; | |
fd38203a | 2449 | |
ddfde737 | 2450 | case SOURCE_CHILD: |
b6d5481b LP |
2451 | if (!was_offline) { |
2452 | assert(s->event->n_online_child_sources > 0); | |
2453 | s->event->n_online_child_sources--; | |
2454 | } | |
fd38203a | 2455 | |
ddfde737 LP |
2456 | if (EVENT_SOURCE_WATCH_PIDFD(s)) |
2457 | source_child_pidfd_unregister(s); | |
2458 | else | |
2459 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
2460 | break; | |
4807d2d0 | 2461 | |
ddfde737 LP |
2462 | case SOURCE_EXIT: |
2463 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
2464 | break; | |
fd38203a | 2465 | |
2115b9b6 YW |
2466 | case SOURCE_TIME_REALTIME: |
2467 | case SOURCE_TIME_BOOTTIME: | |
2468 | case SOURCE_TIME_MONOTONIC: | |
2469 | case SOURCE_TIME_REALTIME_ALARM: | |
2470 | case SOURCE_TIME_BOOTTIME_ALARM: | |
ddfde737 LP |
2471 | case SOURCE_DEFER: |
2472 | case SOURCE_POST: | |
2473 | case SOURCE_INOTIFY: | |
2474 | break; | |
fd38203a | 2475 | |
ddfde737 | 2476 | default: |
04499a70 | 2477 | assert_not_reached(); |
ddfde737 | 2478 | } |
fd38203a | 2479 | |
2115b9b6 YW |
2480 | /* Always reshuffle time prioq, as the ratelimited flag may be changed. */ |
2481 | event_source_time_prioq_reshuffle(s); | |
2482 | ||
b6d5481b | 2483 | return 1; |
ddfde737 | 2484 | } |
f8f3f926 | 2485 | |
b6d5481b LP |
2486 | static int event_source_online( |
2487 | sd_event_source *s, | |
2488 | int enabled, | |
2489 | bool ratelimited) { | |
2490 | ||
2491 | bool was_online; | |
ddfde737 | 2492 | int r; |
fd38203a | 2493 | |
ddfde737 | 2494 | assert(s); |
b6d5481b | 2495 | assert(enabled != SD_EVENT_OFF || !ratelimited); |
305f78bf | 2496 | |
ddfde737 | 2497 | /* Unset the pending flag when this event source is enabled */ |
b6d5481b LP |
2498 | if (s->enabled == SD_EVENT_OFF && |
2499 | enabled != SD_EVENT_OFF && | |
2500 | !IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { | |
ddfde737 LP |
2501 | r = source_set_pending(s, false); |
2502 | if (r < 0) | |
2503 | return r; | |
2504 | } | |
9d3e3aa5 | 2505 | |
b6d5481b LP |
2506 | /* Are we really ready for onlining? */ |
2507 | if (enabled == SD_EVENT_OFF || ratelimited) { | |
2508 | /* Nope, we are not ready for onlining, then just update the precise state and exit */ | |
2509 | s->enabled = enabled; | |
2510 | s->ratelimited = ratelimited; | |
2511 | return 0; | |
2512 | } | |
2513 | ||
2514 | was_online = event_source_is_online(s); | |
2515 | ||
ddfde737 | 2516 | switch (s->type) { |
ddfde737 | 2517 | case SOURCE_IO: |
b6d5481b | 2518 | r = source_io_register(s, enabled, s->io.events); |
d2eafe61 | 2519 | if (r < 0) |
ddfde737 | 2520 | return r; |
ddfde737 | 2521 | break; |
fd38203a | 2522 | |
ddfde737 LP |
2523 | case SOURCE_SIGNAL: |
2524 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
2525 | if (r < 0) { | |
ddfde737 LP |
2526 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
2527 | return r; | |
2528 | } | |
fd38203a | 2529 | |
ddfde737 | 2530 | break; |
fd38203a | 2531 | |
ddfde737 | 2532 | case SOURCE_CHILD: |
ddfde737 LP |
2533 | if (EVENT_SOURCE_WATCH_PIDFD(s)) { |
2534 | /* yes, we have pidfd */ | |
9da4cb2b | 2535 | |
b6d5481b | 2536 | r = source_child_pidfd_register(s, enabled); |
ac9f2640 | 2537 | if (r < 0) |
9da4cb2b | 2538 | return r; |
ddfde737 LP |
2539 | } else { |
2540 | /* no pidfd, or something other to watch for than WEXITED */ | |
9da4cb2b | 2541 | |
ddfde737 LP |
2542 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
2543 | if (r < 0) { | |
ddfde737 LP |
2544 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
2545 | return r; | |
2546 | } | |
2547 | } | |
fd38203a | 2548 | |
b6d5481b LP |
2549 | if (!was_online) |
2550 | s->event->n_online_child_sources++; | |
ddfde737 | 2551 | break; |
4807d2d0 | 2552 | |
d2eafe61 ZJS |
2553 | case SOURCE_TIME_REALTIME: |
2554 | case SOURCE_TIME_BOOTTIME: | |
2555 | case SOURCE_TIME_MONOTONIC: | |
2556 | case SOURCE_TIME_REALTIME_ALARM: | |
2557 | case SOURCE_TIME_BOOTTIME_ALARM: | |
ddfde737 | 2558 | case SOURCE_EXIT: |
ddfde737 LP |
2559 | case SOURCE_DEFER: |
2560 | case SOURCE_POST: | |
2561 | case SOURCE_INOTIFY: | |
2562 | break; | |
9da4cb2b | 2563 | |
ddfde737 | 2564 | default: |
04499a70 | 2565 | assert_not_reached(); |
ddfde737 | 2566 | } |
f8f3f926 | 2567 | |
b6d5481b LP |
2568 | s->enabled = enabled; |
2569 | s->ratelimited = ratelimited; | |
d2eafe61 ZJS |
2570 | |
2571 | /* Non-failing operations below */ | |
2115b9b6 | 2572 | if (s->type == SOURCE_EXIT) |
d2eafe61 | 2573 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
d2eafe61 | 2574 | |
2115b9b6 YW |
2575 | /* Always reshuffle time prioq, as the ratelimited flag may be changed. */ |
2576 | event_source_time_prioq_reshuffle(s); | |
d2eafe61 | 2577 | |
b6d5481b | 2578 | return 1; |
ddfde737 LP |
2579 | } |
2580 | ||
2581 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { | |
2582 | int r; | |
9da4cb2b | 2583 | |
ddfde737 LP |
2584 | assert_return(s, -EINVAL); |
2585 | assert_return(IN_SET(m, SD_EVENT_OFF, SD_EVENT_ON, SD_EVENT_ONESHOT), -EINVAL); | |
2586 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 2587 | |
ddfde737 LP |
2588 | /* If we are dead anyway, we are fine with turning off sources, but everything else needs to fail. */ |
2589 | if (s->event->state == SD_EVENT_FINISHED) | |
2590 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
305f78bf | 2591 | |
ddfde737 LP |
2592 | if (s->enabled == m) /* No change? */ |
2593 | return 0; | |
9d3e3aa5 | 2594 | |
ddfde737 | 2595 | if (m == SD_EVENT_OFF) |
b6d5481b | 2596 | r = event_source_offline(s, m, s->ratelimited); |
ddfde737 LP |
2597 | else { |
2598 | if (s->enabled != SD_EVENT_OFF) { | |
2599 | /* Switching from "on" to "oneshot" or back? If that's the case, we can take a shortcut, the | |
2600 | * event source is already enabled after all. */ | |
2601 | s->enabled = m; | |
2602 | return 0; | |
fd38203a | 2603 | } |
ddfde737 | 2604 | |
b6d5481b | 2605 | r = event_source_online(s, m, s->ratelimited); |
fd38203a | 2606 | } |
ddfde737 LP |
2607 | if (r < 0) |
2608 | return r; | |
fd38203a | 2609 | |
e1951c16 | 2610 | event_source_pp_prioq_reshuffle(s); |
fd38203a LP |
2611 | return 0; |
2612 | } | |
2613 | ||
f7262a9f | 2614 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
2615 | assert_return(s, -EINVAL); |
2616 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 2617 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 2618 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
2619 | |
2620 | *usec = s->time.next; | |
2621 | return 0; | |
2622 | } | |
2623 | ||
f7262a9f | 2624 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
2a0dc6cd | 2625 | int r; |
6a0f1f6d | 2626 | |
305f78bf | 2627 | assert_return(s, -EINVAL); |
6a0f1f6d | 2628 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 2629 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 2630 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 2631 | |
2a0dc6cd LP |
2632 | r = source_set_pending(s, false); |
2633 | if (r < 0) | |
2634 | return r; | |
2576a19e | 2635 | |
2a0dc6cd | 2636 | s->time.next = usec; |
fd38203a | 2637 | |
e1951c16 | 2638 | event_source_time_prioq_reshuffle(s); |
fd38203a LP |
2639 | return 0; |
2640 | } | |
2641 | ||
d6a83dc4 LP |
2642 | _public_ int sd_event_source_set_time_relative(sd_event_source *s, uint64_t usec) { |
2643 | usec_t t; | |
2644 | int r; | |
2645 | ||
2646 | assert_return(s, -EINVAL); | |
2647 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
2648 | ||
2649 | r = sd_event_now(s->event, event_source_type_to_clock(s->type), &t); | |
2650 | if (r < 0) | |
2651 | return r; | |
2652 | ||
496db330 YW |
2653 | usec = usec_add(t, usec); |
2654 | if (usec == USEC_INFINITY) | |
d6a83dc4 LP |
2655 | return -EOVERFLOW; |
2656 | ||
496db330 | 2657 | return sd_event_source_set_time(s, usec); |
d6a83dc4 LP |
2658 | } |
2659 | ||
f7262a9f | 2660 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
2661 | assert_return(s, -EINVAL); |
2662 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 2663 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
2664 | assert_return(!event_pid_changed(s->event), -ECHILD); |
2665 | ||
2666 | *usec = s->time.accuracy; | |
2667 | return 0; | |
2668 | } | |
2669 | ||
f7262a9f | 2670 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
2a0dc6cd | 2671 | int r; |
6a0f1f6d | 2672 | |
305f78bf | 2673 | assert_return(s, -EINVAL); |
f5fbe71d | 2674 | assert_return(usec != UINT64_MAX, -EINVAL); |
6a0f1f6d | 2675 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 2676 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 2677 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef | 2678 | |
2a0dc6cd LP |
2679 | r = source_set_pending(s, false); |
2680 | if (r < 0) | |
2681 | return r; | |
2682 | ||
eaa3cbef LP |
2683 | if (usec == 0) |
2684 | usec = DEFAULT_ACCURACY_USEC; | |
2685 | ||
eaa3cbef LP |
2686 | s->time.accuracy = usec; |
2687 | ||
e1951c16 | 2688 | event_source_time_prioq_reshuffle(s); |
6a0f1f6d LP |
2689 | return 0; |
2690 | } | |
2691 | ||
2692 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
2693 | assert_return(s, -EINVAL); | |
2694 | assert_return(clock, -EINVAL); | |
2695 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
2696 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 2697 | |
6a0f1f6d | 2698 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
2699 | return 0; |
2700 | } | |
2701 | ||
f7262a9f | 2702 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
2703 | assert_return(s, -EINVAL); |
2704 | assert_return(pid, -EINVAL); | |
2705 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2706 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2707 | ||
2708 | *pid = s->child.pid; | |
2709 | return 0; | |
2710 | } | |
2711 | ||
f8f3f926 LP |
2712 | _public_ int sd_event_source_get_child_pidfd(sd_event_source *s) { |
2713 | assert_return(s, -EINVAL); | |
2714 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2715 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2716 | ||
2717 | if (s->child.pidfd < 0) | |
2718 | return -EOPNOTSUPP; | |
2719 | ||
2720 | return s->child.pidfd; | |
2721 | } | |
2722 | ||
2723 | _public_ int sd_event_source_send_child_signal(sd_event_source *s, int sig, const siginfo_t *si, unsigned flags) { | |
2724 | assert_return(s, -EINVAL); | |
2725 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2726 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2727 | assert_return(SIGNAL_VALID(sig), -EINVAL); | |
2728 | ||
2729 | /* If we already have seen indication the process exited refuse sending a signal early. This way we | |
2730 | * can be sure we don't accidentally kill the wrong process on PID reuse when pidfds are not | |
2731 | * available. */ | |
2732 | if (s->child.exited) | |
2733 | return -ESRCH; | |
2734 | ||
2735 | if (s->child.pidfd >= 0) { | |
2736 | siginfo_t copy; | |
2737 | ||
2738 | /* pidfd_send_signal() changes the siginfo_t argument. This is weird, let's hence copy the | |
2739 | * structure here */ | |
2740 | if (si) | |
2741 | copy = *si; | |
2742 | ||
2743 | if (pidfd_send_signal(s->child.pidfd, sig, si ? © : NULL, 0) < 0) { | |
2744 | /* Let's propagate the error only if the system call is not implemented or prohibited */ | |
2745 | if (!ERRNO_IS_NOT_SUPPORTED(errno) && !ERRNO_IS_PRIVILEGE(errno)) | |
2746 | return -errno; | |
2747 | } else | |
2748 | return 0; | |
2749 | } | |
2750 | ||
2751 | /* Flags are only supported for pidfd_send_signal(), not for rt_sigqueueinfo(), hence let's refuse | |
2752 | * this here. */ | |
2753 | if (flags != 0) | |
2754 | return -EOPNOTSUPP; | |
2755 | ||
2756 | if (si) { | |
2757 | /* We use rt_sigqueueinfo() only if siginfo_t is specified. */ | |
2758 | siginfo_t copy = *si; | |
2759 | ||
2760 | if (rt_sigqueueinfo(s->child.pid, sig, ©) < 0) | |
2761 | return -errno; | |
2762 | } else if (kill(s->child.pid, sig) < 0) | |
2763 | return -errno; | |
2764 | ||
2765 | return 0; | |
2766 | } | |
2767 | ||
2768 | _public_ int sd_event_source_get_child_pidfd_own(sd_event_source *s) { | |
2769 | assert_return(s, -EINVAL); | |
2770 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2771 | ||
2772 | if (s->child.pidfd < 0) | |
2773 | return -EOPNOTSUPP; | |
2774 | ||
2775 | return s->child.pidfd_owned; | |
2776 | } | |
2777 | ||
2778 | _public_ int sd_event_source_set_child_pidfd_own(sd_event_source *s, int own) { | |
2779 | assert_return(s, -EINVAL); | |
2780 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2781 | ||
2782 | if (s->child.pidfd < 0) | |
2783 | return -EOPNOTSUPP; | |
2784 | ||
2785 | s->child.pidfd_owned = own; | |
2786 | return 0; | |
2787 | } | |
2788 | ||
2789 | _public_ int sd_event_source_get_child_process_own(sd_event_source *s) { | |
2790 | assert_return(s, -EINVAL); | |
2791 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2792 | ||
2793 | return s->child.process_owned; | |
2794 | } | |
2795 | ||
2796 | _public_ int sd_event_source_set_child_process_own(sd_event_source *s, int own) { | |
2797 | assert_return(s, -EINVAL); | |
2798 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2799 | ||
2800 | s->child.process_owned = own; | |
2801 | return 0; | |
2802 | } | |
2803 | ||
97ef5391 LP |
2804 | _public_ int sd_event_source_get_inotify_mask(sd_event_source *s, uint32_t *mask) { |
2805 | assert_return(s, -EINVAL); | |
2806 | assert_return(mask, -EINVAL); | |
2807 | assert_return(s->type == SOURCE_INOTIFY, -EDOM); | |
2808 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2809 | ||
2810 | *mask = s->inotify.mask; | |
2811 | return 0; | |
2812 | } | |
2813 | ||
718db961 | 2814 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
2815 | int r; |
2816 | ||
da7e457c | 2817 | assert_return(s, -EINVAL); |
6203e07a | 2818 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
2819 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
2820 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
2821 | |
2822 | if (s->prepare == callback) | |
2823 | return 0; | |
2824 | ||
2825 | if (callback && s->prepare) { | |
2826 | s->prepare = callback; | |
2827 | return 0; | |
2828 | } | |
2829 | ||
2830 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
2831 | if (r < 0) | |
2832 | return r; | |
2833 | ||
2834 | s->prepare = callback; | |
2835 | ||
2836 | if (callback) { | |
2837 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
2838 | if (r < 0) | |
2839 | return r; | |
2840 | } else | |
2841 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
2842 | ||
2843 | return 0; | |
2844 | } | |
2845 | ||
f7262a9f | 2846 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 2847 | assert_return(s, NULL); |
fd38203a LP |
2848 | |
2849 | return s->userdata; | |
2850 | } | |
2851 | ||
8f726607 LP |
2852 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
2853 | void *ret; | |
2854 | ||
2855 | assert_return(s, NULL); | |
2856 | ||
2857 | ret = s->userdata; | |
2858 | s->userdata = userdata; | |
2859 | ||
2860 | return ret; | |
2861 | } | |
2862 | ||
b6d5481b LP |
2863 | static int event_source_enter_ratelimited(sd_event_source *s) { |
2864 | int r; | |
2865 | ||
2866 | assert(s); | |
2867 | ||
2868 | /* When an event source becomes ratelimited, we place it in the CLOCK_MONOTONIC priority queue, with | |
2869 | * the end of the rate limit time window, much as if it was a timer event source. */ | |
2870 | ||
2871 | if (s->ratelimited) | |
2872 | return 0; /* Already ratelimited, this is a NOP hence */ | |
2873 | ||
2874 | /* Make sure we can install a CLOCK_MONOTONIC event further down. */ | |
2875 | r = setup_clock_data(s->event, &s->event->monotonic, CLOCK_MONOTONIC); | |
2876 | if (r < 0) | |
2877 | return r; | |
2878 | ||
2879 | /* Timer event sources are already using the earliest/latest queues for the timer scheduling. Let's | |
2880 | * first remove them from the prioq appropriate for their own clock, so that we can use the prioq | |
2881 | * fields of the event source then for adding it to the CLOCK_MONOTONIC prioq instead. */ | |
2882 | if (EVENT_SOURCE_IS_TIME(s->type)) | |
2883 | event_source_time_prioq_remove(s, event_get_clock_data(s->event, s->type)); | |
2884 | ||
2885 | /* Now, let's add the event source to the monotonic clock instead */ | |
2886 | r = event_source_time_prioq_put(s, &s->event->monotonic); | |
2887 | if (r < 0) | |
2888 | goto fail; | |
2889 | ||
2890 | /* And let's take the event source officially offline */ | |
2891 | r = event_source_offline(s, s->enabled, /* ratelimited= */ true); | |
2892 | if (r < 0) { | |
2893 | event_source_time_prioq_remove(s, &s->event->monotonic); | |
2894 | goto fail; | |
2895 | } | |
2896 | ||
2897 | event_source_pp_prioq_reshuffle(s); | |
2898 | ||
2899 | log_debug("Event source %p (%s) entered rate limit state.", s, strna(s->description)); | |
2900 | return 0; | |
2901 | ||
2902 | fail: | |
2903 | /* Reinstall time event sources in the priority queue as before. This shouldn't fail, since the queue | |
2904 | * space for it should already be allocated. */ | |
2905 | if (EVENT_SOURCE_IS_TIME(s->type)) | |
2906 | assert_se(event_source_time_prioq_put(s, event_get_clock_data(s->event, s->type)) >= 0); | |
2907 | ||
2908 | return r; | |
2909 | } | |
2910 | ||
fd69f224 | 2911 | static int event_source_leave_ratelimit(sd_event_source *s, bool run_callback) { |
b6d5481b LP |
2912 | int r; |
2913 | ||
2914 | assert(s); | |
2915 | ||
2916 | if (!s->ratelimited) | |
2917 | return 0; | |
2918 | ||
2919 | /* Let's take the event source out of the monotonic prioq first. */ | |
2920 | event_source_time_prioq_remove(s, &s->event->monotonic); | |
2921 | ||
2922 | /* Let's then add the event source to its native clock prioq again — if this is a timer event source */ | |
2923 | if (EVENT_SOURCE_IS_TIME(s->type)) { | |
2924 | r = event_source_time_prioq_put(s, event_get_clock_data(s->event, s->type)); | |
2925 | if (r < 0) | |
2926 | goto fail; | |
2927 | } | |
2928 | ||
2929 | /* Let's try to take it online again. */ | |
2930 | r = event_source_online(s, s->enabled, /* ratelimited= */ false); | |
2931 | if (r < 0) { | |
2932 | /* Do something roughly sensible when this failed: undo the two prioq ops above */ | |
2933 | if (EVENT_SOURCE_IS_TIME(s->type)) | |
2934 | event_source_time_prioq_remove(s, event_get_clock_data(s->event, s->type)); | |
2935 | ||
2936 | goto fail; | |
2937 | } | |
2938 | ||
2939 | event_source_pp_prioq_reshuffle(s); | |
2940 | ratelimit_reset(&s->rate_limit); | |
2941 | ||
2942 | log_debug("Event source %p (%s) left rate limit state.", s, strna(s->description)); | |
fd69f224 MS |
2943 | |
2944 | if (run_callback && s->ratelimit_expire_callback) { | |
2945 | s->dispatching = true; | |
2946 | r = s->ratelimit_expire_callback(s, s->userdata); | |
2947 | s->dispatching = false; | |
2948 | ||
2949 | if (r < 0) { | |
2950 | log_debug_errno(r, "Ratelimit expiry callback of event source %s (type %s) returned error, %s: %m", | |
2951 | strna(s->description), | |
2952 | event_source_type_to_string(s->type), | |
2953 | s->exit_on_failure ? "exiting" : "disabling"); | |
2954 | ||
2955 | if (s->exit_on_failure) | |
2956 | (void) sd_event_exit(s->event, r); | |
2957 | } | |
2958 | ||
2959 | if (s->n_ref == 0) | |
2960 | source_free(s); | |
2961 | else if (r < 0) | |
0a040e64 | 2962 | assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0); |
fd69f224 MS |
2963 | |
2964 | return 1; | |
2965 | } | |
2966 | ||
b6d5481b LP |
2967 | return 0; |
2968 | ||
2969 | fail: | |
2970 | /* Do something somewhat reasonable when we cannot move an event sources out of ratelimited mode: | |
2971 | * simply put it back in it, maybe we can then process it more successfully next iteration. */ | |
2972 | assert_se(event_source_time_prioq_put(s, &s->event->monotonic) >= 0); | |
2973 | ||
2974 | return r; | |
2975 | } | |
2976 | ||
c2ba3ad6 LP |
2977 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
2978 | usec_t c; | |
2979 | assert(e); | |
2980 | assert(a <= b); | |
2981 | ||
2982 | if (a <= 0) | |
2983 | return 0; | |
393003e1 LP |
2984 | if (a >= USEC_INFINITY) |
2985 | return USEC_INFINITY; | |
c2ba3ad6 LP |
2986 | |
2987 | if (b <= a + 1) | |
2988 | return a; | |
2989 | ||
52444dc4 LP |
2990 | initialize_perturb(e); |
2991 | ||
c2ba3ad6 LP |
2992 | /* |
2993 | Find a good time to wake up again between times a and b. We | |
2994 | have two goals here: | |
2995 | ||
2996 | a) We want to wake up as seldom as possible, hence prefer | |
2997 | later times over earlier times. | |
2998 | ||
2999 | b) But if we have to wake up, then let's make sure to | |
3000 | dispatch as much as possible on the entire system. | |
3001 | ||
3002 | We implement this by waking up everywhere at the same time | |
850516e0 | 3003 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 3004 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
3005 | then we try to find the same spot in every 10s, then 1s and |
3006 | then 250ms step. Otherwise, we pick the last possible time | |
3007 | to wake up. | |
c2ba3ad6 LP |
3008 | */ |
3009 | ||
850516e0 LP |
3010 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
3011 | if (c >= b) { | |
3012 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
3013 | return b; | |
3014 | ||
3015 | c -= USEC_PER_MINUTE; | |
3016 | } | |
3017 | ||
ba276c81 LP |
3018 | if (c >= a) |
3019 | return c; | |
3020 | ||
3021 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
3022 | if (c >= b) { | |
3023 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
3024 | return b; | |
3025 | ||
3026 | c -= USEC_PER_SEC*10; | |
3027 | } | |
3028 | ||
850516e0 LP |
3029 | if (c >= a) |
3030 | return c; | |
3031 | ||
3032 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
3033 | if (c >= b) { |
3034 | if (_unlikely_(c < USEC_PER_SEC)) | |
3035 | return b; | |
3036 | ||
3037 | c -= USEC_PER_SEC; | |
3038 | } | |
3039 | ||
3040 | if (c >= a) | |
3041 | return c; | |
3042 | ||
3043 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
3044 | if (c >= b) { | |
3045 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
3046 | return b; | |
3047 | ||
3048 | c -= USEC_PER_MSEC*250; | |
3049 | } | |
3050 | ||
3051 | if (c >= a) | |
3052 | return c; | |
3053 | ||
3054 | return b; | |
3055 | } | |
3056 | ||
fd38203a LP |
3057 | static int event_arm_timer( |
3058 | sd_event *e, | |
6a0f1f6d | 3059 | struct clock_data *d) { |
fd38203a LP |
3060 | |
3061 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
3062 | sd_event_source *a, *b; |
3063 | usec_t t; | |
fd38203a | 3064 | |
cde93897 | 3065 | assert(e); |
6a0f1f6d | 3066 | assert(d); |
fd38203a | 3067 | |
d06441da | 3068 | if (!d->needs_rearm) |
212bbb17 | 3069 | return 0; |
7e2bf71c YW |
3070 | |
3071 | d->needs_rearm = false; | |
212bbb17 | 3072 | |
6a0f1f6d | 3073 | a = prioq_peek(d->earliest); |
19947509 | 3074 | assert(!a || EVENT_SOURCE_USES_TIME_PRIOQ(a->type)); |
b6d5481b | 3075 | if (!a || a->enabled == SD_EVENT_OFF || time_event_source_next(a) == USEC_INFINITY) { |
72aedc1e | 3076 | |
6a0f1f6d | 3077 | if (d->fd < 0) |
c57b5ca3 LP |
3078 | return 0; |
3079 | ||
3a43da28 | 3080 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
3081 | return 0; |
3082 | ||
3083 | /* disarm */ | |
15c689d7 LP |
3084 | if (timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) |
3085 | return -errno; | |
72aedc1e | 3086 | |
3a43da28 | 3087 | d->next = USEC_INFINITY; |
fd38203a | 3088 | return 0; |
72aedc1e | 3089 | } |
fd38203a | 3090 | |
6a0f1f6d | 3091 | b = prioq_peek(d->latest); |
19947509 ZJS |
3092 | assert(!b || EVENT_SOURCE_USES_TIME_PRIOQ(b->type)); |
3093 | assert(b && b->enabled != SD_EVENT_OFF); | |
c2ba3ad6 | 3094 | |
b6d5481b | 3095 | t = sleep_between(e, time_event_source_next(a), time_event_source_latest(b)); |
6a0f1f6d | 3096 | if (d->next == t) |
fd38203a LP |
3097 | return 0; |
3098 | ||
6a0f1f6d | 3099 | assert_se(d->fd >= 0); |
fd38203a | 3100 | |
c2ba3ad6 | 3101 | if (t == 0) { |
fd38203a LP |
3102 | /* We don' want to disarm here, just mean some time looooong ago. */ |
3103 | its.it_value.tv_sec = 0; | |
3104 | its.it_value.tv_nsec = 1; | |
3105 | } else | |
c2ba3ad6 | 3106 | timespec_store(&its.it_value, t); |
fd38203a | 3107 | |
15c689d7 | 3108 | if (timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) |
cde93897 | 3109 | return -errno; |
fd38203a | 3110 | |
6a0f1f6d | 3111 | d->next = t; |
fd38203a LP |
3112 | return 0; |
3113 | } | |
3114 | ||
9a800b56 | 3115 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
3116 | assert(e); |
3117 | assert(s); | |
3118 | assert(s->type == SOURCE_IO); | |
3119 | ||
9a800b56 LP |
3120 | /* If the event source was already pending, we just OR in the |
3121 | * new revents, otherwise we reset the value. The ORing is | |
3122 | * necessary to handle EPOLLONESHOT events properly where | |
3123 | * readability might happen independently of writability, and | |
3124 | * we need to keep track of both */ | |
3125 | ||
3126 | if (s->pending) | |
3127 | s->io.revents |= revents; | |
3128 | else | |
3129 | s->io.revents = revents; | |
fd38203a | 3130 | |
fd38203a LP |
3131 | return source_set_pending(s, true); |
3132 | } | |
3133 | ||
72aedc1e | 3134 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
3135 | uint64_t x; |
3136 | ssize_t ss; | |
3137 | ||
3138 | assert(e); | |
da7e457c | 3139 | assert(fd >= 0); |
72aedc1e | 3140 | |
305f78bf | 3141 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
3142 | |
3143 | ss = read(fd, &x, sizeof(x)); | |
3144 | if (ss < 0) { | |
945c2931 | 3145 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
3146 | return 0; |
3147 | ||
3148 | return -errno; | |
3149 | } | |
3150 | ||
8d35dae7 | 3151 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
3152 | return -EIO; |
3153 | ||
cde93897 | 3154 | if (next) |
3a43da28 | 3155 | *next = USEC_INFINITY; |
72aedc1e | 3156 | |
fd38203a LP |
3157 | return 0; |
3158 | } | |
3159 | ||
305f78bf LP |
3160 | static int process_timer( |
3161 | sd_event *e, | |
3162 | usec_t n, | |
6a0f1f6d | 3163 | struct clock_data *d) { |
305f78bf | 3164 | |
fd38203a | 3165 | sd_event_source *s; |
fd69f224 | 3166 | bool callback_invoked = false; |
fd38203a LP |
3167 | int r; |
3168 | ||
3169 | assert(e); | |
6a0f1f6d | 3170 | assert(d); |
fd38203a LP |
3171 | |
3172 | for (;;) { | |
6a0f1f6d | 3173 | s = prioq_peek(d->earliest); |
19947509 ZJS |
3174 | assert(!s || EVENT_SOURCE_USES_TIME_PRIOQ(s->type)); |
3175 | ||
b6d5481b LP |
3176 | if (!s || time_event_source_next(s) > n) |
3177 | break; | |
3178 | ||
3179 | if (s->ratelimited) { | |
3180 | /* This is an event sources whose ratelimit window has ended. Let's turn it on | |
3181 | * again. */ | |
3182 | assert(s->ratelimited); | |
3183 | ||
fd69f224 | 3184 | r = event_source_leave_ratelimit(s, /* run_callback */ true); |
b6d5481b LP |
3185 | if (r < 0) |
3186 | return r; | |
fd69f224 MS |
3187 | else if (r == 1) |
3188 | callback_invoked = true; | |
b6d5481b LP |
3189 | |
3190 | continue; | |
3191 | } | |
3192 | ||
3193 | if (s->enabled == SD_EVENT_OFF || s->pending) | |
fd38203a LP |
3194 | break; |
3195 | ||
3196 | r = source_set_pending(s, true); | |
3197 | if (r < 0) | |
3198 | return r; | |
3199 | ||
e1951c16 | 3200 | event_source_time_prioq_reshuffle(s); |
fd38203a LP |
3201 | } |
3202 | ||
fd69f224 | 3203 | return callback_invoked; |
fd38203a LP |
3204 | } |
3205 | ||
efd3be9d YW |
3206 | static int process_child(sd_event *e, int64_t threshold, int64_t *ret_min_priority) { |
3207 | int64_t min_priority = threshold; | |
3208 | bool something_new = false; | |
fd38203a | 3209 | sd_event_source *s; |
fd38203a LP |
3210 | int r; |
3211 | ||
3212 | assert(e); | |
efd3be9d YW |
3213 | assert(ret_min_priority); |
3214 | ||
3215 | if (!e->need_process_child) { | |
3216 | *ret_min_priority = min_priority; | |
3217 | return 0; | |
3218 | } | |
fd38203a | 3219 | |
c2ba3ad6 LP |
3220 | e->need_process_child = false; |
3221 | ||
fd38203a LP |
3222 | /* |
3223 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
3224 | + WNOHANG for each PID we wait for, instead of using | |
3225 | P_ALL. This is because we only want to get child | |
3226 | information of very specific child processes, and not all | |
3227 | of them. We might not have processed the SIGCHLD even of a | |
3228 | previous invocation and we don't want to maintain a | |
3229 | unbounded *per-child* event queue, hence we really don't | |
3230 | want anything flushed out of the kernel's queue that we | |
3231 | don't care about. Since this is O(n) this means that if you | |
3232 | have a lot of processes you probably want to handle SIGCHLD | |
3233 | yourself. | |
08cd1552 LP |
3234 | |
3235 | We do not reap the children here (by using WNOWAIT), this | |
3236 | is only done after the event source is dispatched so that | |
3237 | the callback still sees the process as a zombie. | |
fd38203a LP |
3238 | */ |
3239 | ||
90e74a66 | 3240 | HASHMAP_FOREACH(s, e->child_sources) { |
fd38203a LP |
3241 | assert(s->type == SOURCE_CHILD); |
3242 | ||
efd3be9d YW |
3243 | if (s->priority > threshold) |
3244 | continue; | |
3245 | ||
fd38203a LP |
3246 | if (s->pending) |
3247 | continue; | |
3248 | ||
b6d5481b | 3249 | if (event_source_is_offline(s)) |
fd38203a LP |
3250 | continue; |
3251 | ||
f8f3f926 LP |
3252 | if (s->child.exited) |
3253 | continue; | |
3254 | ||
3255 | if (EVENT_SOURCE_WATCH_PIDFD(s)) /* There's a usable pidfd known for this event source? then don't waitid() for it here */ | |
3256 | continue; | |
3257 | ||
fd38203a | 3258 | zero(s->child.siginfo); |
15c689d7 LP |
3259 | if (waitid(P_PID, s->child.pid, &s->child.siginfo, |
3260 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options) < 0) | |
bfd9bfcc | 3261 | return negative_errno(); |
fd38203a LP |
3262 | |
3263 | if (s->child.siginfo.si_pid != 0) { | |
945c2931 | 3264 | bool zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 | 3265 | |
f8f3f926 LP |
3266 | if (zombie) |
3267 | s->child.exited = true; | |
3268 | ||
08cd1552 LP |
3269 | if (!zombie && (s->child.options & WEXITED)) { |
3270 | /* If the child isn't dead then let's | |
3271 | * immediately remove the state change | |
3272 | * from the queue, since there's no | |
3273 | * benefit in leaving it queued */ | |
3274 | ||
3275 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
a5d27871 | 3276 | (void) waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); |
08cd1552 LP |
3277 | } |
3278 | ||
fd38203a LP |
3279 | r = source_set_pending(s, true); |
3280 | if (r < 0) | |
3281 | return r; | |
efd3be9d YW |
3282 | if (r > 0) { |
3283 | something_new = true; | |
3284 | min_priority = MIN(min_priority, s->priority); | |
3285 | } | |
fd38203a LP |
3286 | } |
3287 | } | |
3288 | ||
efd3be9d YW |
3289 | *ret_min_priority = min_priority; |
3290 | return something_new; | |
fd38203a LP |
3291 | } |
3292 | ||
f8f3f926 LP |
3293 | static int process_pidfd(sd_event *e, sd_event_source *s, uint32_t revents) { |
3294 | assert(e); | |
3295 | assert(s); | |
3296 | assert(s->type == SOURCE_CHILD); | |
3297 | ||
3298 | if (s->pending) | |
3299 | return 0; | |
3300 | ||
b6d5481b | 3301 | if (event_source_is_offline(s)) |
f8f3f926 LP |
3302 | return 0; |
3303 | ||
3304 | if (!EVENT_SOURCE_WATCH_PIDFD(s)) | |
3305 | return 0; | |
3306 | ||
3307 | zero(s->child.siginfo); | |
3308 | if (waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG | WNOWAIT | s->child.options) < 0) | |
3309 | return -errno; | |
3310 | ||
3311 | if (s->child.siginfo.si_pid == 0) | |
3312 | return 0; | |
3313 | ||
3314 | if (IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED)) | |
3315 | s->child.exited = true; | |
3316 | ||
3317 | return source_set_pending(s, true); | |
3318 | } | |
3319 | ||
efd3be9d | 3320 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events, int64_t *min_priority) { |
fd38203a LP |
3321 | int r; |
3322 | ||
da7e457c | 3323 | assert(e); |
97ef5391 | 3324 | assert(d); |
305f78bf | 3325 | assert_return(events == EPOLLIN, -EIO); |
efd3be9d | 3326 | assert(min_priority); |
fd38203a | 3327 | |
9da4cb2b LP |
3328 | /* If there's a signal queued on this priority and SIGCHLD is |
3329 | on this priority too, then make sure to recheck the | |
3330 | children we watch. This is because we only ever dequeue | |
3331 | the first signal per priority, and if we dequeue one, and | |
3332 | SIGCHLD might be enqueued later we wouldn't know, but we | |
3333 | might have higher priority children we care about hence we | |
3334 | need to check that explicitly. */ | |
3335 | ||
3336 | if (sigismember(&d->sigset, SIGCHLD)) | |
3337 | e->need_process_child = true; | |
3338 | ||
3339 | /* If there's already an event source pending for this | |
3340 | * priority we don't read another */ | |
3341 | if (d->current) | |
3342 | return 0; | |
3343 | ||
fd38203a | 3344 | for (;;) { |
0eb2e0e3 | 3345 | struct signalfd_siginfo si; |
7057bd99 | 3346 | ssize_t n; |
92daebc0 | 3347 | sd_event_source *s = NULL; |
fd38203a | 3348 | |
9da4cb2b | 3349 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 3350 | if (n < 0) { |
945c2931 | 3351 | if (IN_SET(errno, EAGAIN, EINTR)) |
efd3be9d | 3352 | return 0; |
fd38203a LP |
3353 | |
3354 | return -errno; | |
3355 | } | |
3356 | ||
7057bd99 | 3357 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
3358 | return -EIO; |
3359 | ||
6eb7c172 | 3360 | assert(SIGNAL_VALID(si.ssi_signo)); |
7057bd99 | 3361 | |
92daebc0 LP |
3362 | if (e->signal_sources) |
3363 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
3364 | if (!s) |
3365 | continue; | |
9da4cb2b LP |
3366 | if (s->pending) |
3367 | continue; | |
fd38203a LP |
3368 | |
3369 | s->signal.siginfo = si; | |
9da4cb2b LP |
3370 | d->current = s; |
3371 | ||
fd38203a LP |
3372 | r = source_set_pending(s, true); |
3373 | if (r < 0) | |
3374 | return r; | |
efd3be9d YW |
3375 | if (r > 0 && *min_priority >= s->priority) { |
3376 | *min_priority = s->priority; | |
3377 | return 1; /* an event source with smaller priority is queued. */ | |
3378 | } | |
9da4cb2b | 3379 | |
efd3be9d | 3380 | return 0; |
fd38203a | 3381 | } |
fd38203a LP |
3382 | } |
3383 | ||
efd3be9d | 3384 | static int event_inotify_data_read(sd_event *e, struct inotify_data *d, uint32_t revents, int64_t threshold) { |
97ef5391 LP |
3385 | ssize_t n; |
3386 | ||
3387 | assert(e); | |
3388 | assert(d); | |
3389 | ||
3390 | assert_return(revents == EPOLLIN, -EIO); | |
3391 | ||
3392 | /* If there's already an event source pending for this priority, don't read another */ | |
3393 | if (d->n_pending > 0) | |
3394 | return 0; | |
3395 | ||
3396 | /* Is the read buffer non-empty? If so, let's not read more */ | |
3397 | if (d->buffer_filled > 0) | |
3398 | return 0; | |
3399 | ||
efd3be9d YW |
3400 | if (d->priority > threshold) |
3401 | return 0; | |
3402 | ||
97ef5391 LP |
3403 | n = read(d->fd, &d->buffer, sizeof(d->buffer)); |
3404 | if (n < 0) { | |
3405 | if (IN_SET(errno, EAGAIN, EINTR)) | |
3406 | return 0; | |
3407 | ||
3408 | return -errno; | |
3409 | } | |
3410 | ||
3411 | assert(n > 0); | |
3412 | d->buffer_filled = (size_t) n; | |
3413 | LIST_PREPEND(buffered, e->inotify_data_buffered, d); | |
3414 | ||
3415 | return 1; | |
3416 | } | |
3417 | ||
3418 | static void event_inotify_data_drop(sd_event *e, struct inotify_data *d, size_t sz) { | |
3419 | assert(e); | |
3420 | assert(d); | |
3421 | assert(sz <= d->buffer_filled); | |
3422 | ||
3423 | if (sz == 0) | |
3424 | return; | |
3425 | ||
3426 | /* Move the rest to the buffer to the front, in order to get things properly aligned again */ | |
3427 | memmove(d->buffer.raw, d->buffer.raw + sz, d->buffer_filled - sz); | |
3428 | d->buffer_filled -= sz; | |
3429 | ||
3430 | if (d->buffer_filled == 0) | |
3431 | LIST_REMOVE(buffered, e->inotify_data_buffered, d); | |
3432 | } | |
3433 | ||
3434 | static int event_inotify_data_process(sd_event *e, struct inotify_data *d) { | |
3435 | int r; | |
3436 | ||
3437 | assert(e); | |
3438 | assert(d); | |
3439 | ||
3440 | /* If there's already an event source pending for this priority, don't read another */ | |
3441 | if (d->n_pending > 0) | |
3442 | return 0; | |
3443 | ||
3444 | while (d->buffer_filled > 0) { | |
3445 | size_t sz; | |
3446 | ||
3447 | /* Let's validate that the event structures are complete */ | |
3448 | if (d->buffer_filled < offsetof(struct inotify_event, name)) | |
3449 | return -EIO; | |
3450 | ||
3451 | sz = offsetof(struct inotify_event, name) + d->buffer.ev.len; | |
3452 | if (d->buffer_filled < sz) | |
3453 | return -EIO; | |
3454 | ||
3455 | if (d->buffer.ev.mask & IN_Q_OVERFLOW) { | |
3456 | struct inode_data *inode_data; | |
97ef5391 LP |
3457 | |
3458 | /* The queue overran, let's pass this event to all event sources connected to this inotify | |
3459 | * object */ | |
3460 | ||
90e74a66 | 3461 | HASHMAP_FOREACH(inode_data, d->inodes) { |
97ef5391 LP |
3462 | sd_event_source *s; |
3463 | ||
3464 | LIST_FOREACH(inotify.by_inode_data, s, inode_data->event_sources) { | |
3465 | ||
b6d5481b | 3466 | if (event_source_is_offline(s)) |
97ef5391 LP |
3467 | continue; |
3468 | ||
3469 | r = source_set_pending(s, true); | |
3470 | if (r < 0) | |
3471 | return r; | |
3472 | } | |
3473 | } | |
3474 | } else { | |
3475 | struct inode_data *inode_data; | |
3476 | sd_event_source *s; | |
3477 | ||
3478 | /* Find the inode object for this watch descriptor. If IN_IGNORED is set we also remove it from | |
3479 | * our watch descriptor table. */ | |
3480 | if (d->buffer.ev.mask & IN_IGNORED) { | |
3481 | ||
3482 | inode_data = hashmap_remove(d->wd, INT_TO_PTR(d->buffer.ev.wd)); | |
3483 | if (!inode_data) { | |
3484 | event_inotify_data_drop(e, d, sz); | |
3485 | continue; | |
3486 | } | |
3487 | ||
3488 | /* The watch descriptor was removed by the kernel, let's drop it here too */ | |
3489 | inode_data->wd = -1; | |
3490 | } else { | |
3491 | inode_data = hashmap_get(d->wd, INT_TO_PTR(d->buffer.ev.wd)); | |
3492 | if (!inode_data) { | |
3493 | event_inotify_data_drop(e, d, sz); | |
3494 | continue; | |
3495 | } | |
3496 | } | |
3497 | ||
3498 | /* Trigger all event sources that are interested in these events. Also trigger all event | |
3499 | * sources if IN_IGNORED or IN_UNMOUNT is set. */ | |
3500 | LIST_FOREACH(inotify.by_inode_data, s, inode_data->event_sources) { | |
3501 | ||
b6d5481b | 3502 | if (event_source_is_offline(s)) |
97ef5391 LP |
3503 | continue; |
3504 | ||
3505 | if ((d->buffer.ev.mask & (IN_IGNORED|IN_UNMOUNT)) == 0 && | |
3506 | (s->inotify.mask & d->buffer.ev.mask & IN_ALL_EVENTS) == 0) | |
3507 | continue; | |
3508 | ||
3509 | r = source_set_pending(s, true); | |
3510 | if (r < 0) | |
3511 | return r; | |
3512 | } | |
3513 | } | |
3514 | ||
3515 | /* Something pending now? If so, let's finish, otherwise let's read more. */ | |
3516 | if (d->n_pending > 0) | |
3517 | return 1; | |
3518 | } | |
3519 | ||
3520 | return 0; | |
3521 | } | |
3522 | ||
3523 | static int process_inotify(sd_event *e) { | |
3524 | struct inotify_data *d; | |
3525 | int r, done = 0; | |
3526 | ||
3527 | assert(e); | |
3528 | ||
3529 | LIST_FOREACH(buffered, d, e->inotify_data_buffered) { | |
3530 | r = event_inotify_data_process(e, d); | |
3531 | if (r < 0) | |
3532 | return r; | |
3533 | if (r > 0) | |
3534 | done ++; | |
3535 | } | |
3536 | ||
3537 | return done; | |
3538 | } | |
3539 | ||
fd38203a | 3540 | static int source_dispatch(sd_event_source *s) { |
b778cba4 | 3541 | _cleanup_(sd_event_unrefp) sd_event *saved_event = NULL; |
8f5c235d | 3542 | EventSourceType saved_type; |
fe8245eb | 3543 | int r = 0; |
fd38203a LP |
3544 | |
3545 | assert(s); | |
6203e07a | 3546 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 3547 | |
b778cba4 LP |
3548 | /* Save the event source type, here, so that we still know it after the event callback which might |
3549 | * invalidate the event. */ | |
8f5c235d LP |
3550 | saved_type = s->type; |
3551 | ||
de02634c | 3552 | /* Similarly, store a reference to the event loop object, so that we can still access it after the |
b778cba4 LP |
3553 | * callback might have invalidated/disconnected the event source. */ |
3554 | saved_event = sd_event_ref(s->event); | |
3555 | ||
de02634c | 3556 | /* Check if we hit the ratelimit for this event source, and if so, let's disable it. */ |
b6d5481b LP |
3557 | assert(!s->ratelimited); |
3558 | if (!ratelimit_below(&s->rate_limit)) { | |
3559 | r = event_source_enter_ratelimited(s); | |
3560 | if (r < 0) | |
3561 | return r; | |
3562 | ||
3563 | return 1; | |
3564 | } | |
3565 | ||
945c2931 | 3566 | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { |
da7e457c LP |
3567 | r = source_set_pending(s, false); |
3568 | if (r < 0) | |
3569 | return r; | |
3570 | } | |
fd38203a | 3571 | |
6e9feda3 LP |
3572 | if (s->type != SOURCE_POST) { |
3573 | sd_event_source *z; | |
6e9feda3 | 3574 | |
de02634c | 3575 | /* If we execute a non-post source, let's mark all post sources as pending. */ |
6e9feda3 | 3576 | |
90e74a66 | 3577 | SET_FOREACH(z, s->event->post_sources) { |
b6d5481b | 3578 | if (event_source_is_offline(z)) |
6e9feda3 LP |
3579 | continue; |
3580 | ||
3581 | r = source_set_pending(z, true); | |
3582 | if (r < 0) | |
3583 | return r; | |
3584 | } | |
3585 | } | |
3586 | ||
baf76283 LP |
3587 | if (s->enabled == SD_EVENT_ONESHOT) { |
3588 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
3589 | if (r < 0) |
3590 | return r; | |
3591 | } | |
3592 | ||
12179984 | 3593 | s->dispatching = true; |
b7484e2a | 3594 | |
fd38203a LP |
3595 | switch (s->type) { |
3596 | ||
3597 | case SOURCE_IO: | |
3598 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
3599 | break; | |
3600 | ||
6a0f1f6d | 3601 | case SOURCE_TIME_REALTIME: |
a8548816 | 3602 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
3603 | case SOURCE_TIME_MONOTONIC: |
3604 | case SOURCE_TIME_REALTIME_ALARM: | |
3605 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
3606 | r = s->time.callback(s, s->time.next, s->userdata); |
3607 | break; | |
3608 | ||
3609 | case SOURCE_SIGNAL: | |
3610 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
3611 | break; | |
3612 | ||
08cd1552 LP |
3613 | case SOURCE_CHILD: { |
3614 | bool zombie; | |
3615 | ||
945c2931 | 3616 | zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 | 3617 | |
fd38203a | 3618 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
3619 | |
3620 | /* Now, reap the PID for good. */ | |
f8f3f926 | 3621 | if (zombie) { |
cc59d290 | 3622 | (void) waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); |
f8f3f926 LP |
3623 | s->child.waited = true; |
3624 | } | |
08cd1552 | 3625 | |
fd38203a | 3626 | break; |
08cd1552 | 3627 | } |
fd38203a LP |
3628 | |
3629 | case SOURCE_DEFER: | |
3630 | r = s->defer.callback(s, s->userdata); | |
3631 | break; | |
da7e457c | 3632 | |
6e9feda3 LP |
3633 | case SOURCE_POST: |
3634 | r = s->post.callback(s, s->userdata); | |
3635 | break; | |
3636 | ||
6203e07a LP |
3637 | case SOURCE_EXIT: |
3638 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 3639 | break; |
9d3e3aa5 | 3640 | |
97ef5391 LP |
3641 | case SOURCE_INOTIFY: { |
3642 | struct sd_event *e = s->event; | |
3643 | struct inotify_data *d; | |
3644 | size_t sz; | |
3645 | ||
3646 | assert(s->inotify.inode_data); | |
3647 | assert_se(d = s->inotify.inode_data->inotify_data); | |
3648 | ||
3649 | assert(d->buffer_filled >= offsetof(struct inotify_event, name)); | |
3650 | sz = offsetof(struct inotify_event, name) + d->buffer.ev.len; | |
3651 | assert(d->buffer_filled >= sz); | |
3652 | ||
53baf2ef LP |
3653 | /* If the inotify callback destroys the event source then this likely means we don't need to |
3654 | * watch the inode anymore, and thus also won't need the inotify object anymore. But if we'd | |
3655 | * free it immediately, then we couldn't drop the event from the inotify event queue without | |
3656 | * memory corruption anymore, as below. Hence, let's not free it immediately, but mark it | |
3657 | * "busy" with a counter (which will ensure it's not GC'ed away prematurely). Let's then | |
3658 | * explicitly GC it after we are done dropping the inotify event from the buffer. */ | |
3659 | d->n_busy++; | |
97ef5391 | 3660 | r = s->inotify.callback(s, &d->buffer.ev, s->userdata); |
53baf2ef | 3661 | d->n_busy--; |
97ef5391 | 3662 | |
53baf2ef LP |
3663 | /* When no event is pending anymore on this inotify object, then let's drop the event from |
3664 | * the inotify event queue buffer. */ | |
97ef5391 LP |
3665 | if (d->n_pending == 0) |
3666 | event_inotify_data_drop(e, d, sz); | |
3667 | ||
53baf2ef LP |
3668 | /* Now we don't want to access 'd' anymore, it's OK to GC now. */ |
3669 | event_gc_inotify_data(e, d); | |
97ef5391 LP |
3670 | break; |
3671 | } | |
3672 | ||
9d3e3aa5 | 3673 | case SOURCE_WATCHDOG: |
a71fe8b8 | 3674 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 3675 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
04499a70 | 3676 | assert_not_reached(); |
fd38203a LP |
3677 | } |
3678 | ||
12179984 LP |
3679 | s->dispatching = false; |
3680 | ||
b778cba4 LP |
3681 | if (r < 0) { |
3682 | log_debug_errno(r, "Event source %s (type %s) returned error, %s: %m", | |
3683 | strna(s->description), | |
3684 | event_source_type_to_string(saved_type), | |
3685 | s->exit_on_failure ? "exiting" : "disabling"); | |
3686 | ||
3687 | if (s->exit_on_failure) | |
3688 | (void) sd_event_exit(saved_event, r); | |
3689 | } | |
12179984 LP |
3690 | |
3691 | if (s->n_ref == 0) | |
3692 | source_free(s); | |
3693 | else if (r < 0) | |
c3c50474 | 3694 | assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0); |
b7484e2a | 3695 | |
6203e07a | 3696 | return 1; |
fd38203a LP |
3697 | } |
3698 | ||
3699 | static int event_prepare(sd_event *e) { | |
3700 | int r; | |
3701 | ||
3702 | assert(e); | |
3703 | ||
3704 | for (;;) { | |
3705 | sd_event_source *s; | |
3706 | ||
3707 | s = prioq_peek(e->prepare); | |
b6d5481b | 3708 | if (!s || s->prepare_iteration == e->iteration || event_source_is_offline(s)) |
fd38203a LP |
3709 | break; |
3710 | ||
3711 | s->prepare_iteration = e->iteration; | |
3712 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
3713 | if (r < 0) | |
3714 | return r; | |
3715 | ||
3716 | assert(s->prepare); | |
12179984 LP |
3717 | |
3718 | s->dispatching = true; | |
fd38203a | 3719 | r = s->prepare(s, s->userdata); |
12179984 LP |
3720 | s->dispatching = false; |
3721 | ||
b778cba4 LP |
3722 | if (r < 0) { |
3723 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, %s: %m", | |
3724 | strna(s->description), | |
3725 | event_source_type_to_string(s->type), | |
3726 | s->exit_on_failure ? "exiting" : "disabling"); | |
3727 | ||
3728 | if (s->exit_on_failure) | |
3729 | (void) sd_event_exit(e, r); | |
3730 | } | |
fd38203a | 3731 | |
12179984 LP |
3732 | if (s->n_ref == 0) |
3733 | source_free(s); | |
3734 | else if (r < 0) | |
c3c50474 | 3735 | assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0); |
fd38203a LP |
3736 | } |
3737 | ||
3738 | return 0; | |
3739 | } | |
3740 | ||
6203e07a | 3741 | static int dispatch_exit(sd_event *e) { |
da7e457c LP |
3742 | sd_event_source *p; |
3743 | int r; | |
3744 | ||
3745 | assert(e); | |
3746 | ||
6203e07a | 3747 | p = prioq_peek(e->exit); |
19947509 ZJS |
3748 | assert(!p || p->type == SOURCE_EXIT); |
3749 | ||
b6d5481b | 3750 | if (!p || event_source_is_offline(p)) { |
da7e457c LP |
3751 | e->state = SD_EVENT_FINISHED; |
3752 | return 0; | |
3753 | } | |
3754 | ||
f814c871 | 3755 | _unused_ _cleanup_(sd_event_unrefp) sd_event *ref = sd_event_ref(e); |
da7e457c | 3756 | e->iteration++; |
6203e07a | 3757 | e->state = SD_EVENT_EXITING; |
da7e457c | 3758 | r = source_dispatch(p); |
2b0c9ef7 | 3759 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
3760 | return r; |
3761 | } | |
3762 | ||
c2ba3ad6 LP |
3763 | static sd_event_source* event_next_pending(sd_event *e) { |
3764 | sd_event_source *p; | |
3765 | ||
da7e457c LP |
3766 | assert(e); |
3767 | ||
c2ba3ad6 LP |
3768 | p = prioq_peek(e->pending); |
3769 | if (!p) | |
3770 | return NULL; | |
3771 | ||
b6d5481b | 3772 | if (event_source_is_offline(p)) |
c2ba3ad6 LP |
3773 | return NULL; |
3774 | ||
3775 | return p; | |
3776 | } | |
3777 | ||
cde93897 LP |
3778 | static int arm_watchdog(sd_event *e) { |
3779 | struct itimerspec its = {}; | |
3780 | usec_t t; | |
cde93897 LP |
3781 | |
3782 | assert(e); | |
3783 | assert(e->watchdog_fd >= 0); | |
3784 | ||
3785 | t = sleep_between(e, | |
a595fb5c YW |
3786 | usec_add(e->watchdog_last, (e->watchdog_period / 2)), |
3787 | usec_add(e->watchdog_last, (e->watchdog_period * 3 / 4))); | |
cde93897 LP |
3788 | |
3789 | timespec_store(&its.it_value, t); | |
3790 | ||
75145780 LP |
3791 | /* Make sure we never set the watchdog to 0, which tells the |
3792 | * kernel to disable it. */ | |
3793 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
3794 | its.it_value.tv_nsec = 1; | |
3795 | ||
7c248223 | 3796 | return RET_NERRNO(timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL)); |
cde93897 LP |
3797 | } |
3798 | ||
3799 | static int process_watchdog(sd_event *e) { | |
3800 | assert(e); | |
3801 | ||
3802 | if (!e->watchdog) | |
3803 | return 0; | |
3804 | ||
3805 | /* Don't notify watchdog too often */ | |
3806 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
3807 | return 0; | |
3808 | ||
3809 | sd_notify(false, "WATCHDOG=1"); | |
3810 | e->watchdog_last = e->timestamp.monotonic; | |
3811 | ||
3812 | return arm_watchdog(e); | |
3813 | } | |
3814 | ||
97ef5391 LP |
3815 | static void event_close_inode_data_fds(sd_event *e) { |
3816 | struct inode_data *d; | |
3817 | ||
3818 | assert(e); | |
3819 | ||
3820 | /* Close the fds pointing to the inodes to watch now. We need to close them as they might otherwise pin | |
3821 | * filesystems. But we can't close them right-away as we need them as long as the user still wants to make | |
5238e957 | 3822 | * adjustments to the even source, such as changing the priority (which requires us to remove and re-add a watch |
97ef5391 LP |
3823 | * for the inode). Hence, let's close them when entering the first iteration after they were added, as a |
3824 | * compromise. */ | |
3825 | ||
3826 | while ((d = e->inode_data_to_close)) { | |
3827 | assert(d->fd >= 0); | |
3828 | d->fd = safe_close(d->fd); | |
3829 | ||
3830 | LIST_REMOVE(to_close, e->inode_data_to_close, d); | |
3831 | } | |
3832 | } | |
3833 | ||
c45a5a74 TG |
3834 | _public_ int sd_event_prepare(sd_event *e) { |
3835 | int r; | |
fd38203a | 3836 | |
da7e457c | 3837 | assert_return(e, -EINVAL); |
b937d761 | 3838 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
3839 | assert_return(!event_pid_changed(e), -ECHILD); |
3840 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 3841 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 3842 | |
e5446015 LP |
3843 | /* Let's check that if we are a default event loop we are executed in the correct thread. We only do |
3844 | * this check here once, since gettid() is typically not cached, and thus want to minimize | |
3845 | * syscalls */ | |
3846 | assert_return(!e->default_event_ptr || e->tid == gettid(), -EREMOTEIO); | |
3847 | ||
f814c871 LP |
3848 | /* Make sure that none of the preparation callbacks ends up freeing the event source under our feet */ |
3849 | _unused_ _cleanup_(sd_event_unrefp) sd_event *ref = sd_event_ref(e); | |
3850 | ||
6203e07a | 3851 | if (e->exit_requested) |
c45a5a74 | 3852 | goto pending; |
fd38203a LP |
3853 | |
3854 | e->iteration++; | |
3855 | ||
0be6c2f6 | 3856 | e->state = SD_EVENT_PREPARING; |
fd38203a | 3857 | r = event_prepare(e); |
0be6c2f6 | 3858 | e->state = SD_EVENT_INITIAL; |
fd38203a | 3859 | if (r < 0) |
c45a5a74 | 3860 | return r; |
fd38203a | 3861 | |
6a0f1f6d LP |
3862 | r = event_arm_timer(e, &e->realtime); |
3863 | if (r < 0) | |
c45a5a74 | 3864 | return r; |
6a0f1f6d | 3865 | |
a8548816 TG |
3866 | r = event_arm_timer(e, &e->boottime); |
3867 | if (r < 0) | |
c45a5a74 | 3868 | return r; |
a8548816 | 3869 | |
6a0f1f6d LP |
3870 | r = event_arm_timer(e, &e->monotonic); |
3871 | if (r < 0) | |
c45a5a74 | 3872 | return r; |
6a0f1f6d LP |
3873 | |
3874 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 3875 | if (r < 0) |
c45a5a74 | 3876 | return r; |
fd38203a | 3877 | |
6a0f1f6d | 3878 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 3879 | if (r < 0) |
c45a5a74 | 3880 | return r; |
fd38203a | 3881 | |
97ef5391 LP |
3882 | event_close_inode_data_fds(e); |
3883 | ||
1b5995b0 | 3884 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
3885 | goto pending; |
3886 | ||
2b0c9ef7 | 3887 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
3888 | |
3889 | return 0; | |
3890 | ||
3891 | pending: | |
2b0c9ef7 | 3892 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
3893 | r = sd_event_wait(e, 0); |
3894 | if (r == 0) | |
2b0c9ef7 | 3895 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
3896 | |
3897 | return r; | |
c45a5a74 TG |
3898 | } |
3899 | ||
798445ab LP |
3900 | static int epoll_wait_usec( |
3901 | int fd, | |
3902 | struct epoll_event *events, | |
3903 | int maxevents, | |
3904 | usec_t timeout) { | |
3905 | ||
7c248223 | 3906 | int msec; |
39f756d3 ZJS |
3907 | #if 0 |
3908 | static bool epoll_pwait2_absent = false; | |
798445ab | 3909 | |
39f756d3 ZJS |
3910 | /* A wrapper that uses epoll_pwait2() if available, and falls back to epoll_wait() if not. |
3911 | * | |
3912 | * FIXME: this is temporarily disabled until epoll_pwait2() becomes more widely available. | |
3913 | * See https://github.com/systemd/systemd/pull/18973 and | |
3914 | * https://github.com/systemd/systemd/issues/19052. */ | |
798445ab LP |
3915 | |
3916 | if (!epoll_pwait2_absent && timeout != USEC_INFINITY) { | |
3917 | struct timespec ts; | |
3918 | ||
3919 | r = epoll_pwait2(fd, | |
3920 | events, | |
3921 | maxevents, | |
3922 | timespec_store(&ts, timeout), | |
3923 | NULL); | |
3924 | if (r >= 0) | |
3925 | return r; | |
7cb45dbf | 3926 | if (!ERRNO_IS_NOT_SUPPORTED(errno) && !ERRNO_IS_PRIVILEGE(errno)) |
798445ab LP |
3927 | return -errno; /* Only fallback to old epoll_wait() if the syscall is masked or not |
3928 | * supported. */ | |
3929 | ||
3930 | epoll_pwait2_absent = true; | |
3931 | } | |
39f756d3 | 3932 | #endif |
798445ab LP |
3933 | |
3934 | if (timeout == USEC_INFINITY) | |
3935 | msec = -1; | |
3936 | else { | |
3937 | usec_t k; | |
3938 | ||
3939 | k = DIV_ROUND_UP(timeout, USEC_PER_MSEC); | |
3940 | if (k >= INT_MAX) | |
3941 | msec = INT_MAX; /* Saturate */ | |
3942 | else | |
3943 | msec = (int) k; | |
3944 | } | |
3945 | ||
7c248223 | 3946 | return RET_NERRNO(epoll_wait(fd, events, maxevents, msec)); |
798445ab LP |
3947 | } |
3948 | ||
efd3be9d | 3949 | static int process_epoll(sd_event *e, usec_t timeout, int64_t threshold, int64_t *ret_min_priority) { |
319a4f4b | 3950 | size_t n_event_queue, m, n_event_max; |
efd3be9d YW |
3951 | int64_t min_priority = threshold; |
3952 | bool something_new = false; | |
798445ab | 3953 | int r; |
c45a5a74 | 3954 | |
efd3be9d YW |
3955 | assert(e); |
3956 | assert(ret_min_priority); | |
6a0f1f6d | 3957 | |
8b9708d1 | 3958 | n_event_queue = MAX(e->n_sources, 1u); |
319a4f4b | 3959 | if (!GREEDY_REALLOC(e->event_queue, n_event_queue)) |
5cddd924 | 3960 | return -ENOMEM; |
fd38203a | 3961 | |
319a4f4b LP |
3962 | n_event_max = MALLOC_ELEMENTSOF(e->event_queue); |
3963 | ||
97ef5391 LP |
3964 | /* If we still have inotify data buffered, then query the other fds, but don't wait on it */ |
3965 | if (e->inotify_data_buffered) | |
798445ab | 3966 | timeout = 0; |
97ef5391 | 3967 | |
8b9708d1 | 3968 | for (;;) { |
319a4f4b LP |
3969 | r = epoll_wait_usec( |
3970 | e->epoll_fd, | |
3971 | e->event_queue, | |
3972 | n_event_max, | |
3973 | timeout); | |
798445ab | 3974 | if (r < 0) |
efd3be9d | 3975 | return r; |
c45a5a74 | 3976 | |
8b9708d1 YW |
3977 | m = (size_t) r; |
3978 | ||
319a4f4b | 3979 | if (m < n_event_max) |
8b9708d1 YW |
3980 | break; |
3981 | ||
319a4f4b | 3982 | if (n_event_max >= n_event_queue * 10) |
8b9708d1 YW |
3983 | break; |
3984 | ||
319a4f4b | 3985 | if (!GREEDY_REALLOC(e->event_queue, n_event_max + n_event_queue)) |
8b9708d1 YW |
3986 | return -ENOMEM; |
3987 | ||
319a4f4b | 3988 | n_event_max = MALLOC_ELEMENTSOF(e->event_queue); |
798445ab | 3989 | timeout = 0; |
da7e457c | 3990 | } |
fd38203a | 3991 | |
efd3be9d YW |
3992 | /* Set timestamp only when this is called first time. */ |
3993 | if (threshold == INT64_MAX) | |
3994 | triple_timestamp_get(&e->timestamp); | |
fd38203a | 3995 | |
8b9708d1 | 3996 | for (size_t i = 0; i < m; i++) { |
fd38203a | 3997 | |
5cddd924 LP |
3998 | if (e->event_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
3999 | r = flush_timer(e, e->watchdog_fd, e->event_queue[i].events, NULL); | |
9da4cb2b | 4000 | else { |
5cddd924 | 4001 | WakeupType *t = e->event_queue[i].data.ptr; |
9da4cb2b LP |
4002 | |
4003 | switch (*t) { | |
4004 | ||
f8f3f926 | 4005 | case WAKEUP_EVENT_SOURCE: { |
5cddd924 | 4006 | sd_event_source *s = e->event_queue[i].data.ptr; |
f8f3f926 LP |
4007 | |
4008 | assert(s); | |
4009 | ||
efd3be9d YW |
4010 | if (s->priority > threshold) |
4011 | continue; | |
4012 | ||
4013 | min_priority = MIN(min_priority, s->priority); | |
4014 | ||
f8f3f926 LP |
4015 | switch (s->type) { |
4016 | ||
4017 | case SOURCE_IO: | |
5cddd924 | 4018 | r = process_io(e, s, e->event_queue[i].events); |
f8f3f926 LP |
4019 | break; |
4020 | ||
4021 | case SOURCE_CHILD: | |
5cddd924 | 4022 | r = process_pidfd(e, s, e->event_queue[i].events); |
f8f3f926 LP |
4023 | break; |
4024 | ||
4025 | default: | |
04499a70 | 4026 | assert_not_reached(); |
f8f3f926 LP |
4027 | } |
4028 | ||
9da4cb2b | 4029 | break; |
f8f3f926 | 4030 | } |
fd38203a | 4031 | |
9da4cb2b | 4032 | case WAKEUP_CLOCK_DATA: { |
5cddd924 | 4033 | struct clock_data *d = e->event_queue[i].data.ptr; |
f8f3f926 LP |
4034 | |
4035 | assert(d); | |
4036 | ||
5cddd924 | 4037 | r = flush_timer(e, d->fd, e->event_queue[i].events, &d->next); |
9da4cb2b LP |
4038 | break; |
4039 | } | |
4040 | ||
4041 | case WAKEUP_SIGNAL_DATA: | |
efd3be9d | 4042 | r = process_signal(e, e->event_queue[i].data.ptr, e->event_queue[i].events, &min_priority); |
9da4cb2b LP |
4043 | break; |
4044 | ||
97ef5391 | 4045 | case WAKEUP_INOTIFY_DATA: |
efd3be9d | 4046 | r = event_inotify_data_read(e, e->event_queue[i].data.ptr, e->event_queue[i].events, threshold); |
97ef5391 LP |
4047 | break; |
4048 | ||
9da4cb2b | 4049 | default: |
04499a70 | 4050 | assert_not_reached(); |
9da4cb2b LP |
4051 | } |
4052 | } | |
efd3be9d YW |
4053 | if (r < 0) |
4054 | return r; | |
4055 | if (r > 0) | |
4056 | something_new = true; | |
4057 | } | |
4058 | ||
4059 | *ret_min_priority = min_priority; | |
4060 | return something_new; | |
4061 | } | |
4062 | ||
4063 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
4064 | int r; | |
4065 | ||
4066 | assert_return(e, -EINVAL); | |
4067 | assert_return(e = event_resolve(e), -ENOPKG); | |
4068 | assert_return(!event_pid_changed(e), -ECHILD); | |
4069 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
4070 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); | |
4071 | ||
4072 | if (e->exit_requested) { | |
4073 | e->state = SD_EVENT_PENDING; | |
4074 | return 1; | |
4075 | } | |
4076 | ||
4077 | for (int64_t threshold = INT64_MAX; ; threshold--) { | |
4078 | int64_t epoll_min_priority, child_min_priority; | |
4079 | ||
4080 | /* There may be a possibility that new epoll (especially IO) and child events are | |
4081 | * triggered just after process_epoll() call but before process_child(), and the new IO | |
4082 | * events may have higher priority than the child events. To salvage these events, | |
4083 | * let's call epoll_wait() again, but accepts only events with higher priority than the | |
4084 | * previous. See issue https://github.com/systemd/systemd/issues/18190 and comments | |
4085 | * https://github.com/systemd/systemd/pull/18750#issuecomment-785801085 | |
4086 | * https://github.com/systemd/systemd/pull/18922#issuecomment-792825226 */ | |
4087 | ||
4088 | r = process_epoll(e, timeout, threshold, &epoll_min_priority); | |
4089 | if (r == -EINTR) { | |
4090 | e->state = SD_EVENT_PENDING; | |
4091 | return 1; | |
4092 | } | |
4093 | if (r < 0) | |
4094 | goto finish; | |
4095 | if (r == 0 && threshold < INT64_MAX) | |
4096 | /* No new epoll event. */ | |
4097 | break; | |
4098 | ||
4099 | r = process_child(e, threshold, &child_min_priority); | |
fd38203a | 4100 | if (r < 0) |
da7e457c | 4101 | goto finish; |
efd3be9d YW |
4102 | if (r == 0) |
4103 | /* No new child event. */ | |
4104 | break; | |
4105 | ||
4106 | threshold = MIN(epoll_min_priority, child_min_priority); | |
4107 | if (threshold == INT64_MIN) | |
4108 | break; | |
4109 | ||
4110 | timeout = 0; | |
fd38203a LP |
4111 | } |
4112 | ||
cde93897 LP |
4113 | r = process_watchdog(e); |
4114 | if (r < 0) | |
4115 | goto finish; | |
4116 | ||
fd69f224 | 4117 | r = process_inotify(e); |
6a0f1f6d LP |
4118 | if (r < 0) |
4119 | goto finish; | |
4120 | ||
fd69f224 | 4121 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
a8548816 TG |
4122 | if (r < 0) |
4123 | goto finish; | |
4124 | ||
fd69f224 | 4125 | r = process_timer(e, e->timestamp.boottime, &e->boottime); |
6a0f1f6d LP |
4126 | if (r < 0) |
4127 | goto finish; | |
4128 | ||
4129 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 4130 | if (r < 0) |
da7e457c | 4131 | goto finish; |
fd38203a | 4132 | |
e475d10c | 4133 | r = process_timer(e, e->timestamp.boottime, &e->boottime_alarm); |
fd38203a | 4134 | if (r < 0) |
da7e457c | 4135 | goto finish; |
fd38203a | 4136 | |
fd69f224 | 4137 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
97ef5391 LP |
4138 | if (r < 0) |
4139 | goto finish; | |
fd69f224 MS |
4140 | else if (r == 1) { |
4141 | /* Ratelimit expiry callback was called. Let's postpone processing pending sources and | |
4142 | * put loop in the initial state in order to evaluate (in the next iteration) also sources | |
4143 | * there were potentially re-enabled by the callback. | |
4144 | * | |
4145 | * Wondering why we treat only this invocation of process_timer() differently? Once event | |
4146 | * source is ratelimited we essentially transform it into CLOCK_MONOTONIC timer hence | |
4147 | * ratelimit expiry callback is never called for any other timer type. */ | |
4148 | r = 0; | |
4149 | goto finish; | |
4150 | } | |
97ef5391 | 4151 | |
c45a5a74 TG |
4152 | if (event_next_pending(e)) { |
4153 | e->state = SD_EVENT_PENDING; | |
c45a5a74 | 4154 | return 1; |
da7e457c LP |
4155 | } |
4156 | ||
c45a5a74 | 4157 | r = 0; |
fd38203a | 4158 | |
da7e457c | 4159 | finish: |
2b0c9ef7 | 4160 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
4161 | |
4162 | return r; | |
fd38203a LP |
4163 | } |
4164 | ||
c45a5a74 TG |
4165 | _public_ int sd_event_dispatch(sd_event *e) { |
4166 | sd_event_source *p; | |
4167 | int r; | |
4168 | ||
4169 | assert_return(e, -EINVAL); | |
b937d761 | 4170 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
4171 | assert_return(!event_pid_changed(e), -ECHILD); |
4172 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
4173 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
4174 | ||
4175 | if (e->exit_requested) | |
4176 | return dispatch_exit(e); | |
4177 | ||
4178 | p = event_next_pending(e); | |
4179 | if (p) { | |
f814c871 | 4180 | _unused_ _cleanup_(sd_event_unrefp) sd_event *ref = sd_event_ref(e); |
c45a5a74 TG |
4181 | |
4182 | e->state = SD_EVENT_RUNNING; | |
4183 | r = source_dispatch(p); | |
2b0c9ef7 | 4184 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
4185 | return r; |
4186 | } | |
4187 | ||
2b0c9ef7 | 4188 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
4189 | |
4190 | return 1; | |
4191 | } | |
4192 | ||
34b87517 | 4193 | static void event_log_delays(sd_event *e) { |
442ac269 YW |
4194 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1], *p; |
4195 | size_t l, i; | |
34b87517 | 4196 | |
442ac269 YW |
4197 | p = b; |
4198 | l = sizeof(b); | |
4199 | for (i = 0; i < ELEMENTSOF(e->delays); i++) { | |
4200 | l = strpcpyf(&p, l, "%u ", e->delays[i]); | |
34b87517 VC |
4201 | e->delays[i] = 0; |
4202 | } | |
442ac269 | 4203 | log_debug("Event loop iterations: %s", b); |
34b87517 VC |
4204 | } |
4205 | ||
c45a5a74 TG |
4206 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
4207 | int r; | |
4208 | ||
4209 | assert_return(e, -EINVAL); | |
b937d761 | 4210 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
4211 | assert_return(!event_pid_changed(e), -ECHILD); |
4212 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 4213 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 | 4214 | |
e6a7bee5 | 4215 | if (e->profile_delays && e->last_run_usec != 0) { |
34b87517 VC |
4216 | usec_t this_run; |
4217 | unsigned l; | |
4218 | ||
4219 | this_run = now(CLOCK_MONOTONIC); | |
4220 | ||
e6a7bee5 | 4221 | l = u64log2(this_run - e->last_run_usec); |
cb9d621e | 4222 | assert(l < ELEMENTSOF(e->delays)); |
34b87517 VC |
4223 | e->delays[l]++; |
4224 | ||
e6a7bee5 | 4225 | if (this_run - e->last_log_usec >= 5*USEC_PER_SEC) { |
34b87517 | 4226 | event_log_delays(e); |
e6a7bee5 | 4227 | e->last_log_usec = this_run; |
34b87517 VC |
4228 | } |
4229 | } | |
4230 | ||
f814c871 LP |
4231 | /* Make sure that none of the preparation callbacks ends up freeing the event source under our feet */ |
4232 | _unused_ _cleanup_(sd_event_unrefp) sd_event *ref = sd_event_ref(e); | |
4233 | ||
c45a5a74 | 4234 | r = sd_event_prepare(e); |
53bac4e0 LP |
4235 | if (r == 0) |
4236 | /* There was nothing? Then wait... */ | |
4237 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 4238 | |
34b87517 | 4239 | if (e->profile_delays) |
e6a7bee5 | 4240 | e->last_run_usec = now(CLOCK_MONOTONIC); |
34b87517 | 4241 | |
02d30981 | 4242 | if (r > 0) { |
53bac4e0 | 4243 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
4244 | r = sd_event_dispatch(e); |
4245 | if (r < 0) | |
4246 | return r; | |
53bac4e0 LP |
4247 | |
4248 | return 1; | |
4249 | } | |
4250 | ||
4251 | return r; | |
c45a5a74 TG |
4252 | } |
4253 | ||
f7262a9f | 4254 | _public_ int sd_event_loop(sd_event *e) { |
fd38203a LP |
4255 | int r; |
4256 | ||
da7e457c | 4257 | assert_return(e, -EINVAL); |
b937d761 | 4258 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c | 4259 | assert_return(!event_pid_changed(e), -ECHILD); |
2b0c9ef7 | 4260 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 4261 | |
9f6ef467 | 4262 | _unused_ _cleanup_(sd_event_unrefp) sd_event *ref = sd_event_ref(e); |
fd38203a | 4263 | |
da7e457c | 4264 | while (e->state != SD_EVENT_FINISHED) { |
f5fbe71d | 4265 | r = sd_event_run(e, UINT64_MAX); |
fd38203a | 4266 | if (r < 0) |
30dd293c | 4267 | return r; |
fd38203a LP |
4268 | } |
4269 | ||
30dd293c | 4270 | return e->exit_code; |
fd38203a LP |
4271 | } |
4272 | ||
9b364545 | 4273 | _public_ int sd_event_get_fd(sd_event *e) { |
9b364545 | 4274 | assert_return(e, -EINVAL); |
b937d761 | 4275 | assert_return(e = event_resolve(e), -ENOPKG); |
9b364545 TG |
4276 | assert_return(!event_pid_changed(e), -ECHILD); |
4277 | ||
4278 | return e->epoll_fd; | |
4279 | } | |
4280 | ||
f7262a9f | 4281 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c | 4282 | assert_return(e, -EINVAL); |
b937d761 | 4283 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
4284 | assert_return(!event_pid_changed(e), -ECHILD); |
4285 | ||
4286 | return e->state; | |
4287 | } | |
4288 | ||
6203e07a | 4289 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 4290 | assert_return(e, -EINVAL); |
b937d761 | 4291 | assert_return(e = event_resolve(e), -ENOPKG); |
6203e07a | 4292 | assert_return(code, -EINVAL); |
da7e457c | 4293 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 4294 | |
6203e07a LP |
4295 | if (!e->exit_requested) |
4296 | return -ENODATA; | |
4297 | ||
4298 | *code = e->exit_code; | |
4299 | return 0; | |
fd38203a LP |
4300 | } |
4301 | ||
6203e07a | 4302 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c | 4303 | assert_return(e, -EINVAL); |
b937d761 | 4304 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
4305 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
4306 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 4307 | |
6203e07a LP |
4308 | e->exit_requested = true; |
4309 | e->exit_code = code; | |
4310 | ||
fd38203a LP |
4311 | return 0; |
4312 | } | |
46e8c825 | 4313 | |
6a0f1f6d | 4314 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 | 4315 | assert_return(e, -EINVAL); |
b937d761 | 4316 | assert_return(e = event_resolve(e), -ENOPKG); |
46e8c825 | 4317 | assert_return(usec, -EINVAL); |
46e8c825 LP |
4318 | assert_return(!event_pid_changed(e), -ECHILD); |
4319 | ||
e475d10c LP |
4320 | if (!TRIPLE_TIMESTAMP_HAS_CLOCK(clock)) |
4321 | return -EOPNOTSUPP; | |
4322 | ||
4323 | /* Generate a clean error in case CLOCK_BOOTTIME is not available. Note that don't use clock_supported() here, | |
4324 | * for a reason: there are systems where CLOCK_BOOTTIME is supported, but CLOCK_BOOTTIME_ALARM is not, but for | |
4325 | * the purpose of getting the time this doesn't matter. */ | |
3411372e LP |
4326 | if (IN_SET(clock, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM) && !clock_boottime_supported()) |
4327 | return -EOPNOTSUPP; | |
4328 | ||
e475d10c | 4329 | if (!triple_timestamp_is_set(&e->timestamp)) { |
15c689d7 | 4330 | /* Implicitly fall back to now() if we never ran before and thus have no cached time. */ |
38a03f06 LP |
4331 | *usec = now(clock); |
4332 | return 1; | |
4333 | } | |
46e8c825 | 4334 | |
e475d10c | 4335 | *usec = triple_timestamp_by_clock(&e->timestamp, clock); |
46e8c825 LP |
4336 | return 0; |
4337 | } | |
afc6adb5 LP |
4338 | |
4339 | _public_ int sd_event_default(sd_event **ret) { | |
39883f62 | 4340 | sd_event *e = NULL; |
afc6adb5 LP |
4341 | int r; |
4342 | ||
4343 | if (!ret) | |
4344 | return !!default_event; | |
4345 | ||
4346 | if (default_event) { | |
4347 | *ret = sd_event_ref(default_event); | |
4348 | return 0; | |
4349 | } | |
4350 | ||
4351 | r = sd_event_new(&e); | |
4352 | if (r < 0) | |
4353 | return r; | |
4354 | ||
4355 | e->default_event_ptr = &default_event; | |
4356 | e->tid = gettid(); | |
4357 | default_event = e; | |
4358 | ||
4359 | *ret = e; | |
4360 | return 1; | |
4361 | } | |
4362 | ||
4363 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
4364 | assert_return(e, -EINVAL); | |
b937d761 | 4365 | assert_return(e = event_resolve(e), -ENOPKG); |
afc6adb5 | 4366 | assert_return(tid, -EINVAL); |
76b54375 | 4367 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 4368 | |
76b54375 LP |
4369 | if (e->tid != 0) { |
4370 | *tid = e->tid; | |
4371 | return 0; | |
4372 | } | |
4373 | ||
4374 | return -ENXIO; | |
afc6adb5 | 4375 | } |
cde93897 LP |
4376 | |
4377 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
4378 | int r; | |
4379 | ||
4380 | assert_return(e, -EINVAL); | |
b937d761 | 4381 | assert_return(e = event_resolve(e), -ENOPKG); |
8f726607 | 4382 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
4383 | |
4384 | if (e->watchdog == !!b) | |
4385 | return e->watchdog; | |
4386 | ||
4387 | if (b) { | |
09812eb7 LP |
4388 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
4389 | if (r <= 0) | |
cde93897 | 4390 | return r; |
cde93897 LP |
4391 | |
4392 | /* Issue first ping immediately */ | |
4393 | sd_notify(false, "WATCHDOG=1"); | |
4394 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
4395 | ||
4396 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
4397 | if (e->watchdog_fd < 0) | |
4398 | return -errno; | |
4399 | ||
4400 | r = arm_watchdog(e); | |
4401 | if (r < 0) | |
4402 | goto fail; | |
4403 | ||
1eac7948 | 4404 | struct epoll_event ev = { |
a82f89aa LP |
4405 | .events = EPOLLIN, |
4406 | .data.ptr = INT_TO_PTR(SOURCE_WATCHDOG), | |
4407 | }; | |
cde93897 | 4408 | |
15c689d7 | 4409 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev) < 0) { |
cde93897 LP |
4410 | r = -errno; |
4411 | goto fail; | |
4412 | } | |
4413 | ||
4414 | } else { | |
4415 | if (e->watchdog_fd >= 0) { | |
5a795bff | 4416 | (void) epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); |
03e334a1 | 4417 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
4418 | } |
4419 | } | |
4420 | ||
4421 | e->watchdog = !!b; | |
4422 | return e->watchdog; | |
4423 | ||
4424 | fail: | |
03e334a1 | 4425 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
4426 | return r; |
4427 | } | |
8f726607 LP |
4428 | |
4429 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
4430 | assert_return(e, -EINVAL); | |
b937d761 | 4431 | assert_return(e = event_resolve(e), -ENOPKG); |
8f726607 LP |
4432 | assert_return(!event_pid_changed(e), -ECHILD); |
4433 | ||
4434 | return e->watchdog; | |
4435 | } | |
60a3b1e1 LP |
4436 | |
4437 | _public_ int sd_event_get_iteration(sd_event *e, uint64_t *ret) { | |
4438 | assert_return(e, -EINVAL); | |
b937d761 | 4439 | assert_return(e = event_resolve(e), -ENOPKG); |
60a3b1e1 LP |
4440 | assert_return(!event_pid_changed(e), -ECHILD); |
4441 | ||
4442 | *ret = e->iteration; | |
4443 | return 0; | |
4444 | } | |
15723a1d LP |
4445 | |
4446 | _public_ int sd_event_source_set_destroy_callback(sd_event_source *s, sd_event_destroy_t callback) { | |
4447 | assert_return(s, -EINVAL); | |
4448 | ||
4449 | s->destroy_callback = callback; | |
4450 | return 0; | |
4451 | } | |
4452 | ||
4453 | _public_ int sd_event_source_get_destroy_callback(sd_event_source *s, sd_event_destroy_t *ret) { | |
4454 | assert_return(s, -EINVAL); | |
4455 | ||
4456 | if (ret) | |
4457 | *ret = s->destroy_callback; | |
4458 | ||
4459 | return !!s->destroy_callback; | |
4460 | } | |
2382c936 YW |
4461 | |
4462 | _public_ int sd_event_source_get_floating(sd_event_source *s) { | |
4463 | assert_return(s, -EINVAL); | |
4464 | ||
4465 | return s->floating; | |
4466 | } | |
4467 | ||
4468 | _public_ int sd_event_source_set_floating(sd_event_source *s, int b) { | |
4469 | assert_return(s, -EINVAL); | |
4470 | ||
4471 | if (s->floating == !!b) | |
4472 | return 0; | |
4473 | ||
4474 | if (!s->event) /* Already disconnected */ | |
4475 | return -ESTALE; | |
4476 | ||
4477 | s->floating = b; | |
4478 | ||
4479 | if (b) { | |
4480 | sd_event_source_ref(s); | |
4481 | sd_event_unref(s->event); | |
4482 | } else { | |
4483 | sd_event_ref(s->event); | |
4484 | sd_event_source_unref(s); | |
4485 | } | |
4486 | ||
4487 | return 1; | |
4488 | } | |
b778cba4 LP |
4489 | |
4490 | _public_ int sd_event_source_get_exit_on_failure(sd_event_source *s) { | |
4491 | assert_return(s, -EINVAL); | |
4492 | assert_return(s->type != SOURCE_EXIT, -EDOM); | |
4493 | ||
4494 | return s->exit_on_failure; | |
4495 | } | |
4496 | ||
4497 | _public_ int sd_event_source_set_exit_on_failure(sd_event_source *s, int b) { | |
4498 | assert_return(s, -EINVAL); | |
4499 | assert_return(s->type != SOURCE_EXIT, -EDOM); | |
4500 | ||
4501 | if (s->exit_on_failure == !!b) | |
4502 | return 0; | |
4503 | ||
4504 | s->exit_on_failure = b; | |
4505 | return 1; | |
4506 | } | |
b6d5481b LP |
4507 | |
4508 | _public_ int sd_event_source_set_ratelimit(sd_event_source *s, uint64_t interval, unsigned burst) { | |
4509 | int r; | |
4510 | ||
4511 | assert_return(s, -EINVAL); | |
4512 | ||
4513 | /* Turning on ratelimiting on event source types that don't support it, is a loggable offense. Doing | |
4514 | * so is a programming error. */ | |
4515 | assert_return(EVENT_SOURCE_CAN_RATE_LIMIT(s->type), -EDOM); | |
4516 | ||
4517 | /* When ratelimiting is configured we'll always reset the rate limit state first and start fresh, | |
4518 | * non-ratelimited. */ | |
fd69f224 | 4519 | r = event_source_leave_ratelimit(s, /* run_callback */ false); |
b6d5481b LP |
4520 | if (r < 0) |
4521 | return r; | |
4522 | ||
4523 | s->rate_limit = (RateLimit) { interval, burst }; | |
4524 | return 0; | |
fd69f224 MS |
4525 | } |
4526 | ||
4527 | _public_ int sd_event_source_set_ratelimit_expire_callback(sd_event_source *s, sd_event_handler_t callback) { | |
4528 | assert_return(s, -EINVAL); | |
4529 | ||
4530 | s->ratelimit_expire_callback = callback; | |
4531 | return 0; | |
b6d5481b LP |
4532 | } |
4533 | ||
4534 | _public_ int sd_event_source_get_ratelimit(sd_event_source *s, uint64_t *ret_interval, unsigned *ret_burst) { | |
4535 | assert_return(s, -EINVAL); | |
4536 | ||
4537 | /* Querying whether an event source has ratelimiting configured is not a loggable offsense, hence | |
4538 | * don't use assert_return(). Unlike turning on ratelimiting it's not really a programming error */ | |
4539 | if (!EVENT_SOURCE_CAN_RATE_LIMIT(s->type)) | |
4540 | return -EDOM; | |
4541 | ||
4542 | if (!ratelimit_configured(&s->rate_limit)) | |
4543 | return -ENOEXEC; | |
4544 | ||
4545 | if (ret_interval) | |
4546 | *ret_interval = s->rate_limit.interval; | |
4547 | if (ret_burst) | |
4548 | *ret_burst = s->rate_limit.burst; | |
4549 | ||
4550 | return 0; | |
4551 | } | |
4552 | ||
4553 | _public_ int sd_event_source_is_ratelimited(sd_event_source *s) { | |
4554 | assert_return(s, -EINVAL); | |
4555 | ||
4556 | if (!EVENT_SOURCE_CAN_RATE_LIMIT(s->type)) | |
4557 | return false; | |
4558 | ||
4559 | if (!ratelimit_configured(&s->rate_limit)) | |
4560 | return false; | |
4561 | ||
4562 | return s->ratelimited; | |
4563 | } |