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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 | ||
55cbfaa5 DM |
40 | static const char* const event_source_type_table[_SOURCE_EVENT_SOURCE_TYPE_MAX] = { |
41 | [SOURCE_IO] = "io", | |
42 | [SOURCE_TIME_REALTIME] = "realtime", | |
43 | [SOURCE_TIME_BOOTTIME] = "bootime", | |
44 | [SOURCE_TIME_MONOTONIC] = "monotonic", | |
45 | [SOURCE_TIME_REALTIME_ALARM] = "realtime-alarm", | |
46 | [SOURCE_TIME_BOOTTIME_ALARM] = "boottime-alarm", | |
47 | [SOURCE_SIGNAL] = "signal", | |
48 | [SOURCE_CHILD] = "child", | |
49 | [SOURCE_DEFER] = "defer", | |
50 | [SOURCE_POST] = "post", | |
51 | [SOURCE_EXIT] = "exit", | |
52 | [SOURCE_WATCHDOG] = "watchdog", | |
97ef5391 | 53 | [SOURCE_INOTIFY] = "inotify", |
55cbfaa5 DM |
54 | }; |
55 | ||
56 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(event_source_type, int); | |
57 | ||
a8548816 | 58 | #define EVENT_SOURCE_IS_TIME(t) IN_SET((t), SOURCE_TIME_REALTIME, SOURCE_TIME_BOOTTIME, SOURCE_TIME_MONOTONIC, SOURCE_TIME_REALTIME_ALARM, SOURCE_TIME_BOOTTIME_ALARM) |
6a0f1f6d | 59 | |
fd38203a | 60 | struct sd_event { |
da7e457c | 61 | unsigned n_ref; |
fd38203a LP |
62 | |
63 | int epoll_fd; | |
cde93897 | 64 | int watchdog_fd; |
fd38203a LP |
65 | |
66 | Prioq *pending; | |
67 | Prioq *prepare; | |
c2ba3ad6 | 68 | |
a8548816 | 69 | /* timerfd_create() only supports these five clocks so far. We |
6a0f1f6d LP |
70 | * can add support for more clocks when the kernel learns to |
71 | * deal with them, too. */ | |
72 | struct clock_data realtime; | |
a8548816 | 73 | struct clock_data boottime; |
6a0f1f6d LP |
74 | struct clock_data monotonic; |
75 | struct clock_data realtime_alarm; | |
76 | struct clock_data boottime_alarm; | |
fd38203a | 77 | |
da7e457c LP |
78 | usec_t perturb; |
79 | ||
9da4cb2b LP |
80 | sd_event_source **signal_sources; /* indexed by signal number */ |
81 | Hashmap *signal_data; /* indexed by priority */ | |
fd38203a LP |
82 | |
83 | Hashmap *child_sources; | |
baf76283 | 84 | unsigned n_enabled_child_sources; |
fd38203a | 85 | |
6e9feda3 LP |
86 | Set *post_sources; |
87 | ||
6203e07a | 88 | Prioq *exit; |
fd38203a | 89 | |
97ef5391 LP |
90 | Hashmap *inotify_data; /* indexed by priority */ |
91 | ||
92 | /* A list of inode structures that still have an fd open, that we need to close before the next loop iteration */ | |
93 | LIST_HEAD(struct inode_data, inode_data_to_close); | |
94 | ||
95 | /* A list of inotify objects that already have events buffered which aren't processed yet */ | |
96 | LIST_HEAD(struct inotify_data, inotify_data_buffered); | |
97 | ||
da7e457c | 98 | pid_t original_pid; |
c2ba3ad6 | 99 | |
60a3b1e1 | 100 | uint64_t iteration; |
e475d10c | 101 | triple_timestamp timestamp; |
da7e457c | 102 | int state; |
eaa3cbef | 103 | |
6203e07a | 104 | bool exit_requested:1; |
da7e457c | 105 | bool need_process_child:1; |
cde93897 | 106 | bool watchdog:1; |
34b87517 | 107 | bool profile_delays:1; |
afc6adb5 | 108 | |
6203e07a LP |
109 | int exit_code; |
110 | ||
afc6adb5 LP |
111 | pid_t tid; |
112 | sd_event **default_event_ptr; | |
cde93897 LP |
113 | |
114 | usec_t watchdog_last, watchdog_period; | |
15b38f93 LP |
115 | |
116 | unsigned n_sources; | |
a71fe8b8 | 117 | |
5cddd924 LP |
118 | struct epoll_event *event_queue; |
119 | size_t event_queue_allocated; | |
120 | ||
a71fe8b8 | 121 | LIST_HEAD(sd_event_source, sources); |
34b87517 VC |
122 | |
123 | usec_t last_run, last_log; | |
124 | unsigned delays[sizeof(usec_t) * 8]; | |
fd38203a LP |
125 | }; |
126 | ||
b937d761 NM |
127 | static thread_local sd_event *default_event = NULL; |
128 | ||
a71fe8b8 | 129 | static void source_disconnect(sd_event_source *s); |
97ef5391 | 130 | static void event_gc_inode_data(sd_event *e, struct inode_data *d); |
a71fe8b8 | 131 | |
b937d761 NM |
132 | static sd_event *event_resolve(sd_event *e) { |
133 | return e == SD_EVENT_DEFAULT ? default_event : e; | |
134 | } | |
135 | ||
fd38203a LP |
136 | static int pending_prioq_compare(const void *a, const void *b) { |
137 | const sd_event_source *x = a, *y = b; | |
9c57a73b | 138 | int r; |
fd38203a LP |
139 | |
140 | assert(x->pending); | |
141 | assert(y->pending); | |
142 | ||
baf76283 LP |
143 | /* Enabled ones first */ |
144 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 145 | return -1; |
baf76283 | 146 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
147 | return 1; |
148 | ||
149 | /* Lower priority values first */ | |
9c57a73b YW |
150 | r = CMP(x->priority, y->priority); |
151 | if (r != 0) | |
152 | return r; | |
fd38203a LP |
153 | |
154 | /* Older entries first */ | |
9c57a73b | 155 | return CMP(x->pending_iteration, y->pending_iteration); |
fd38203a LP |
156 | } |
157 | ||
158 | static int prepare_prioq_compare(const void *a, const void *b) { | |
159 | const sd_event_source *x = a, *y = b; | |
9c57a73b | 160 | int r; |
fd38203a LP |
161 | |
162 | assert(x->prepare); | |
163 | assert(y->prepare); | |
164 | ||
8046c457 KK |
165 | /* Enabled ones first */ |
166 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
167 | return -1; | |
168 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) | |
169 | return 1; | |
170 | ||
fd38203a LP |
171 | /* Move most recently prepared ones last, so that we can stop |
172 | * preparing as soon as we hit one that has already been | |
173 | * prepared in the current iteration */ | |
9c57a73b YW |
174 | r = CMP(x->prepare_iteration, y->prepare_iteration); |
175 | if (r != 0) | |
176 | return r; | |
fd38203a | 177 | |
fd38203a | 178 | /* Lower priority values first */ |
9c57a73b | 179 | return CMP(x->priority, y->priority); |
fd38203a LP |
180 | } |
181 | ||
c2ba3ad6 | 182 | static int earliest_time_prioq_compare(const void *a, const void *b) { |
fd38203a LP |
183 | const sd_event_source *x = a, *y = b; |
184 | ||
6a0f1f6d LP |
185 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
186 | assert(x->type == y->type); | |
fd38203a | 187 | |
baf76283 LP |
188 | /* Enabled ones first */ |
189 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
fd38203a | 190 | return -1; |
baf76283 | 191 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
fd38203a LP |
192 | return 1; |
193 | ||
194 | /* Move the pending ones to the end */ | |
195 | if (!x->pending && y->pending) | |
196 | return -1; | |
197 | if (x->pending && !y->pending) | |
198 | return 1; | |
199 | ||
200 | /* Order by time */ | |
9c57a73b | 201 | return CMP(x->time.next, y->time.next); |
fd38203a LP |
202 | } |
203 | ||
1bce0ffa LP |
204 | static usec_t time_event_source_latest(const sd_event_source *s) { |
205 | return usec_add(s->time.next, s->time.accuracy); | |
206 | } | |
207 | ||
c2ba3ad6 LP |
208 | static int latest_time_prioq_compare(const void *a, const void *b) { |
209 | const sd_event_source *x = a, *y = b; | |
210 | ||
6a0f1f6d LP |
211 | assert(EVENT_SOURCE_IS_TIME(x->type)); |
212 | assert(x->type == y->type); | |
c2ba3ad6 | 213 | |
baf76283 LP |
214 | /* Enabled ones first */ |
215 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
c2ba3ad6 | 216 | return -1; |
baf76283 | 217 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
c2ba3ad6 LP |
218 | return 1; |
219 | ||
220 | /* Move the pending ones to the end */ | |
221 | if (!x->pending && y->pending) | |
222 | return -1; | |
223 | if (x->pending && !y->pending) | |
224 | return 1; | |
225 | ||
226 | /* Order by time */ | |
9c57a73b | 227 | return CMP(time_event_source_latest(x), time_event_source_latest(y)); |
c2ba3ad6 LP |
228 | } |
229 | ||
6203e07a | 230 | static int exit_prioq_compare(const void *a, const void *b) { |
da7e457c LP |
231 | const sd_event_source *x = a, *y = b; |
232 | ||
6203e07a LP |
233 | assert(x->type == SOURCE_EXIT); |
234 | assert(y->type == SOURCE_EXIT); | |
da7e457c | 235 | |
baf76283 LP |
236 | /* Enabled ones first */ |
237 | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) | |
da7e457c | 238 | return -1; |
baf76283 | 239 | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
da7e457c LP |
240 | return 1; |
241 | ||
242 | /* Lower priority values first */ | |
6dd91b36 | 243 | return CMP(x->priority, y->priority); |
da7e457c LP |
244 | } |
245 | ||
6a0f1f6d LP |
246 | static void free_clock_data(struct clock_data *d) { |
247 | assert(d); | |
9da4cb2b | 248 | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
6a0f1f6d LP |
249 | |
250 | safe_close(d->fd); | |
251 | prioq_free(d->earliest); | |
252 | prioq_free(d->latest); | |
253 | } | |
254 | ||
8301aa0b | 255 | static sd_event *event_free(sd_event *e) { |
a71fe8b8 LP |
256 | sd_event_source *s; |
257 | ||
fd38203a | 258 | assert(e); |
a71fe8b8 LP |
259 | |
260 | while ((s = e->sources)) { | |
261 | assert(s->floating); | |
262 | source_disconnect(s); | |
263 | sd_event_source_unref(s); | |
264 | } | |
265 | ||
15b38f93 | 266 | assert(e->n_sources == 0); |
fd38203a | 267 | |
afc6adb5 LP |
268 | if (e->default_event_ptr) |
269 | *(e->default_event_ptr) = NULL; | |
270 | ||
03e334a1 | 271 | safe_close(e->epoll_fd); |
03e334a1 | 272 | safe_close(e->watchdog_fd); |
cde93897 | 273 | |
6a0f1f6d | 274 | free_clock_data(&e->realtime); |
a8548816 | 275 | free_clock_data(&e->boottime); |
6a0f1f6d LP |
276 | free_clock_data(&e->monotonic); |
277 | free_clock_data(&e->realtime_alarm); | |
278 | free_clock_data(&e->boottime_alarm); | |
279 | ||
fd38203a LP |
280 | prioq_free(e->pending); |
281 | prioq_free(e->prepare); | |
6203e07a | 282 | prioq_free(e->exit); |
fd38203a LP |
283 | |
284 | free(e->signal_sources); | |
9da4cb2b | 285 | hashmap_free(e->signal_data); |
fd38203a | 286 | |
97ef5391 LP |
287 | hashmap_free(e->inotify_data); |
288 | ||
fd38203a | 289 | hashmap_free(e->child_sources); |
6e9feda3 | 290 | set_free(e->post_sources); |
8301aa0b | 291 | |
5cddd924 LP |
292 | free(e->event_queue); |
293 | ||
8301aa0b | 294 | return mfree(e); |
fd38203a LP |
295 | } |
296 | ||
f7262a9f | 297 | _public_ int sd_event_new(sd_event** ret) { |
fd38203a LP |
298 | sd_event *e; |
299 | int r; | |
300 | ||
305f78bf | 301 | assert_return(ret, -EINVAL); |
fd38203a | 302 | |
d08eb1fa | 303 | e = new(sd_event, 1); |
fd38203a LP |
304 | if (!e) |
305 | return -ENOMEM; | |
306 | ||
d08eb1fa LP |
307 | *e = (sd_event) { |
308 | .n_ref = 1, | |
309 | .epoll_fd = -1, | |
310 | .watchdog_fd = -1, | |
311 | .realtime.wakeup = WAKEUP_CLOCK_DATA, | |
312 | .realtime.fd = -1, | |
313 | .realtime.next = USEC_INFINITY, | |
314 | .boottime.wakeup = WAKEUP_CLOCK_DATA, | |
315 | .boottime.fd = -1, | |
316 | .boottime.next = USEC_INFINITY, | |
317 | .monotonic.wakeup = WAKEUP_CLOCK_DATA, | |
318 | .monotonic.fd = -1, | |
319 | .monotonic.next = USEC_INFINITY, | |
320 | .realtime_alarm.wakeup = WAKEUP_CLOCK_DATA, | |
321 | .realtime_alarm.fd = -1, | |
322 | .realtime_alarm.next = USEC_INFINITY, | |
323 | .boottime_alarm.wakeup = WAKEUP_CLOCK_DATA, | |
324 | .boottime_alarm.fd = -1, | |
325 | .boottime_alarm.next = USEC_INFINITY, | |
326 | .perturb = USEC_INFINITY, | |
327 | .original_pid = getpid_cached(), | |
328 | }; | |
fd38203a | 329 | |
c983e776 EV |
330 | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
331 | if (r < 0) | |
fd38203a | 332 | goto fail; |
fd38203a LP |
333 | |
334 | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
335 | if (e->epoll_fd < 0) { | |
336 | r = -errno; | |
337 | goto fail; | |
338 | } | |
339 | ||
7fe2903c LP |
340 | e->epoll_fd = fd_move_above_stdio(e->epoll_fd); |
341 | ||
34b87517 | 342 | if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) { |
34a6843d | 343 | 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 |
344 | e->profile_delays = true; |
345 | } | |
346 | ||
fd38203a LP |
347 | *ret = e; |
348 | return 0; | |
349 | ||
350 | fail: | |
351 | event_free(e); | |
352 | return r; | |
353 | } | |
354 | ||
8301aa0b | 355 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_event, sd_event, event_free); |
fd38203a | 356 | |
afd15bbb ZJS |
357 | _public_ sd_event_source* sd_event_source_disable_unref(sd_event_source *s) { |
358 | if (s) | |
359 | (void) sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
360 | return sd_event_source_unref(s); | |
361 | } | |
362 | ||
eaa3cbef LP |
363 | static bool event_pid_changed(sd_event *e) { |
364 | assert(e); | |
365 | ||
a2360a46 | 366 | /* We don't support people creating an event loop and keeping |
eaa3cbef LP |
367 | * it around over a fork(). Let's complain. */ |
368 | ||
df0ff127 | 369 | return e->original_pid != getpid_cached(); |
eaa3cbef LP |
370 | } |
371 | ||
366e6411 | 372 | static void source_io_unregister(sd_event_source *s) { |
fd38203a LP |
373 | assert(s); |
374 | assert(s->type == SOURCE_IO); | |
375 | ||
f6806734 | 376 | if (event_pid_changed(s->event)) |
366e6411 | 377 | return; |
f6806734 | 378 | |
fd38203a | 379 | if (!s->io.registered) |
366e6411 | 380 | return; |
fd38203a | 381 | |
d1cf2023 | 382 | if (epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL) < 0) |
55cbfaa5 DM |
383 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m", |
384 | strna(s->description), event_source_type_to_string(s->type)); | |
fd38203a LP |
385 | |
386 | s->io.registered = false; | |
fd38203a LP |
387 | } |
388 | ||
305f78bf LP |
389 | static int source_io_register( |
390 | sd_event_source *s, | |
391 | int enabled, | |
392 | uint32_t events) { | |
393 | ||
fd38203a LP |
394 | assert(s); |
395 | assert(s->type == SOURCE_IO); | |
baf76283 | 396 | assert(enabled != SD_EVENT_OFF); |
fd38203a | 397 | |
1eac7948 | 398 | struct epoll_event ev = { |
a82f89aa LP |
399 | .events = events | (enabled == SD_EVENT_ONESHOT ? EPOLLONESHOT : 0), |
400 | .data.ptr = s, | |
401 | }; | |
fd38203a | 402 | |
15c689d7 | 403 | if (epoll_ctl(s->event->epoll_fd, |
1eac7948 | 404 | s->io.registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD, |
55c540d3 | 405 | s->io.fd, &ev) < 0) |
fd38203a LP |
406 | return -errno; |
407 | ||
408 | s->io.registered = true; | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
f8f3f926 LP |
413 | static void source_child_pidfd_unregister(sd_event_source *s) { |
414 | assert(s); | |
415 | assert(s->type == SOURCE_CHILD); | |
416 | ||
417 | if (event_pid_changed(s->event)) | |
418 | return; | |
419 | ||
420 | if (!s->child.registered) | |
421 | return; | |
422 | ||
423 | if (EVENT_SOURCE_WATCH_PIDFD(s)) | |
424 | if (epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->child.pidfd, NULL) < 0) | |
425 | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m", | |
426 | strna(s->description), event_source_type_to_string(s->type)); | |
427 | ||
428 | s->child.registered = false; | |
429 | } | |
430 | ||
431 | static int source_child_pidfd_register(sd_event_source *s, int enabled) { | |
f8f3f926 LP |
432 | assert(s); |
433 | assert(s->type == SOURCE_CHILD); | |
434 | assert(enabled != SD_EVENT_OFF); | |
435 | ||
436 | if (EVENT_SOURCE_WATCH_PIDFD(s)) { | |
1eac7948 | 437 | struct epoll_event ev = { |
f8f3f926 LP |
438 | .events = EPOLLIN | (enabled == SD_EVENT_ONESHOT ? EPOLLONESHOT : 0), |
439 | .data.ptr = s, | |
440 | }; | |
441 | ||
55c540d3 ZJS |
442 | if (epoll_ctl(s->event->epoll_fd, |
443 | s->child.registered ? EPOLL_CTL_MOD : EPOLL_CTL_ADD, | |
444 | s->child.pidfd, &ev) < 0) | |
f8f3f926 LP |
445 | return -errno; |
446 | } | |
447 | ||
448 | s->child.registered = true; | |
449 | return 0; | |
450 | } | |
451 | ||
6a0f1f6d LP |
452 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
453 | ||
454 | switch (t) { | |
455 | ||
456 | case SOURCE_TIME_REALTIME: | |
457 | return CLOCK_REALTIME; | |
458 | ||
a8548816 TG |
459 | case SOURCE_TIME_BOOTTIME: |
460 | return CLOCK_BOOTTIME; | |
461 | ||
6a0f1f6d LP |
462 | case SOURCE_TIME_MONOTONIC: |
463 | return CLOCK_MONOTONIC; | |
464 | ||
465 | case SOURCE_TIME_REALTIME_ALARM: | |
466 | return CLOCK_REALTIME_ALARM; | |
467 | ||
468 | case SOURCE_TIME_BOOTTIME_ALARM: | |
469 | return CLOCK_BOOTTIME_ALARM; | |
470 | ||
471 | default: | |
472 | return (clockid_t) -1; | |
473 | } | |
474 | } | |
475 | ||
476 | static EventSourceType clock_to_event_source_type(clockid_t clock) { | |
477 | ||
478 | switch (clock) { | |
479 | ||
480 | case CLOCK_REALTIME: | |
481 | return SOURCE_TIME_REALTIME; | |
482 | ||
a8548816 TG |
483 | case CLOCK_BOOTTIME: |
484 | return SOURCE_TIME_BOOTTIME; | |
485 | ||
6a0f1f6d LP |
486 | case CLOCK_MONOTONIC: |
487 | return SOURCE_TIME_MONOTONIC; | |
488 | ||
489 | case CLOCK_REALTIME_ALARM: | |
490 | return SOURCE_TIME_REALTIME_ALARM; | |
491 | ||
492 | case CLOCK_BOOTTIME_ALARM: | |
493 | return SOURCE_TIME_BOOTTIME_ALARM; | |
494 | ||
495 | default: | |
496 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; | |
497 | } | |
498 | } | |
499 | ||
500 | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { | |
501 | assert(e); | |
502 | ||
503 | switch (t) { | |
504 | ||
505 | case SOURCE_TIME_REALTIME: | |
506 | return &e->realtime; | |
507 | ||
a8548816 TG |
508 | case SOURCE_TIME_BOOTTIME: |
509 | return &e->boottime; | |
510 | ||
6a0f1f6d LP |
511 | case SOURCE_TIME_MONOTONIC: |
512 | return &e->monotonic; | |
513 | ||
514 | case SOURCE_TIME_REALTIME_ALARM: | |
515 | return &e->realtime_alarm; | |
516 | ||
517 | case SOURCE_TIME_BOOTTIME_ALARM: | |
518 | return &e->boottime_alarm; | |
519 | ||
520 | default: | |
521 | return NULL; | |
522 | } | |
523 | } | |
524 | ||
3e4eb8e7 YW |
525 | static void event_free_signal_data(sd_event *e, struct signal_data *d) { |
526 | assert(e); | |
527 | ||
528 | if (!d) | |
529 | return; | |
530 | ||
531 | hashmap_remove(e->signal_data, &d->priority); | |
532 | safe_close(d->fd); | |
533 | free(d); | |
534 | } | |
535 | ||
9da4cb2b LP |
536 | static int event_make_signal_data( |
537 | sd_event *e, | |
538 | int sig, | |
539 | struct signal_data **ret) { | |
4807d2d0 | 540 | |
9da4cb2b LP |
541 | struct signal_data *d; |
542 | bool added = false; | |
543 | sigset_t ss_copy; | |
544 | int64_t priority; | |
f95387cd ZJS |
545 | int r; |
546 | ||
547 | assert(e); | |
548 | ||
f6806734 | 549 | if (event_pid_changed(e)) |
9da4cb2b | 550 | return -ECHILD; |
f6806734 | 551 | |
9da4cb2b LP |
552 | if (e->signal_sources && e->signal_sources[sig]) |
553 | priority = e->signal_sources[sig]->priority; | |
554 | else | |
de05913d | 555 | priority = SD_EVENT_PRIORITY_NORMAL; |
f95387cd | 556 | |
9da4cb2b LP |
557 | d = hashmap_get(e->signal_data, &priority); |
558 | if (d) { | |
559 | if (sigismember(&d->sigset, sig) > 0) { | |
560 | if (ret) | |
561 | *ret = d; | |
562 | return 0; | |
563 | } | |
564 | } else { | |
565 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); | |
566 | if (r < 0) | |
567 | return r; | |
568 | ||
d08eb1fa | 569 | d = new(struct signal_data, 1); |
9da4cb2b LP |
570 | if (!d) |
571 | return -ENOMEM; | |
572 | ||
d08eb1fa LP |
573 | *d = (struct signal_data) { |
574 | .wakeup = WAKEUP_SIGNAL_DATA, | |
575 | .fd = -1, | |
576 | .priority = priority, | |
577 | }; | |
9da4cb2b LP |
578 | |
579 | r = hashmap_put(e->signal_data, &d->priority, d); | |
90f604d1 ZJS |
580 | if (r < 0) { |
581 | free(d); | |
9da4cb2b | 582 | return r; |
90f604d1 | 583 | } |
f95387cd | 584 | |
9da4cb2b LP |
585 | added = true; |
586 | } | |
587 | ||
588 | ss_copy = d->sigset; | |
589 | assert_se(sigaddset(&ss_copy, sig) >= 0); | |
590 | ||
591 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); | |
592 | if (r < 0) { | |
593 | r = -errno; | |
594 | goto fail; | |
595 | } | |
596 | ||
597 | d->sigset = ss_copy; | |
f95387cd | 598 | |
9da4cb2b LP |
599 | if (d->fd >= 0) { |
600 | if (ret) | |
601 | *ret = d; | |
f95387cd | 602 | return 0; |
9da4cb2b LP |
603 | } |
604 | ||
7fe2903c | 605 | d->fd = fd_move_above_stdio(r); |
f95387cd | 606 | |
1eac7948 | 607 | struct epoll_event ev = { |
a82f89aa LP |
608 | .events = EPOLLIN, |
609 | .data.ptr = d, | |
610 | }; | |
f95387cd | 611 | |
15c689d7 | 612 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev) < 0) { |
9da4cb2b LP |
613 | r = -errno; |
614 | goto fail; | |
f95387cd ZJS |
615 | } |
616 | ||
9da4cb2b LP |
617 | if (ret) |
618 | *ret = d; | |
619 | ||
f95387cd | 620 | return 0; |
9da4cb2b LP |
621 | |
622 | fail: | |
3e4eb8e7 YW |
623 | if (added) |
624 | event_free_signal_data(e, d); | |
9da4cb2b LP |
625 | |
626 | return r; | |
627 | } | |
628 | ||
629 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { | |
630 | assert(e); | |
631 | assert(d); | |
632 | ||
633 | /* Turns off the specified signal in the signal data | |
634 | * object. If the signal mask of the object becomes empty that | |
635 | * way removes it. */ | |
636 | ||
637 | if (sigismember(&d->sigset, sig) == 0) | |
638 | return; | |
639 | ||
640 | assert_se(sigdelset(&d->sigset, sig) >= 0); | |
641 | ||
642 | if (sigisemptyset(&d->sigset)) { | |
9da4cb2b | 643 | /* If all the mask is all-zero we can get rid of the structure */ |
3e4eb8e7 | 644 | event_free_signal_data(e, d); |
9da4cb2b LP |
645 | return; |
646 | } | |
647 | ||
648 | assert(d->fd >= 0); | |
649 | ||
650 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) | |
651 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); | |
652 | } | |
653 | ||
654 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { | |
655 | struct signal_data *d; | |
656 | static const int64_t zero_priority = 0; | |
657 | ||
658 | assert(e); | |
659 | ||
f8f3f926 LP |
660 | /* Rechecks if the specified signal is still something we are interested in. If not, we'll unmask it, |
661 | * and possibly drop the signalfd for it. */ | |
9da4cb2b LP |
662 | |
663 | if (sig == SIGCHLD && | |
664 | e->n_enabled_child_sources > 0) | |
665 | return; | |
666 | ||
667 | if (e->signal_sources && | |
668 | e->signal_sources[sig] && | |
669 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) | |
670 | return; | |
671 | ||
672 | /* | |
673 | * The specified signal might be enabled in three different queues: | |
674 | * | |
675 | * 1) the one that belongs to the priority passed (if it is non-NULL) | |
676 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) | |
677 | * 3) the 0 priority (to cover the SIGCHLD case) | |
678 | * | |
679 | * Hence, let's remove it from all three here. | |
680 | */ | |
681 | ||
682 | if (priority) { | |
683 | d = hashmap_get(e->signal_data, priority); | |
684 | if (d) | |
685 | event_unmask_signal_data(e, d, sig); | |
686 | } | |
687 | ||
688 | if (e->signal_sources && e->signal_sources[sig]) { | |
689 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); | |
690 | if (d) | |
691 | event_unmask_signal_data(e, d, sig); | |
692 | } | |
693 | ||
694 | d = hashmap_get(e->signal_data, &zero_priority); | |
695 | if (d) | |
696 | event_unmask_signal_data(e, d, sig); | |
f95387cd ZJS |
697 | } |
698 | ||
e1951c16 MS |
699 | static void event_source_pp_prioq_reshuffle(sd_event_source *s) { |
700 | assert(s); | |
701 | ||
702 | /* Reshuffles the pending + prepare prioqs. Called whenever the dispatch order changes, i.e. when | |
703 | * they are enabled/disabled or marked pending and such. */ | |
704 | ||
705 | if (s->pending) | |
706 | prioq_reshuffle(s->event->pending, s, &s->pending_index); | |
707 | ||
708 | if (s->prepare) | |
709 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); | |
710 | } | |
711 | ||
712 | static void event_source_time_prioq_reshuffle(sd_event_source *s) { | |
713 | struct clock_data *d; | |
714 | ||
715 | assert(s); | |
716 | assert(EVENT_SOURCE_IS_TIME(s->type)); | |
717 | ||
718 | /* Called whenever the event source's timer ordering properties changed, i.e. time, accuracy, | |
719 | * pending, enable state. Makes sure the two prioq's are ordered properly again. */ | |
720 | assert_se(d = event_get_clock_data(s->event, s->type)); | |
721 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); | |
722 | prioq_reshuffle(d->latest, s, &s->time.latest_index); | |
723 | d->needs_rearm = true; | |
724 | } | |
725 | ||
a71fe8b8 LP |
726 | static void source_disconnect(sd_event_source *s) { |
727 | sd_event *event; | |
728 | ||
fd38203a LP |
729 | assert(s); |
730 | ||
a71fe8b8 LP |
731 | if (!s->event) |
732 | return; | |
15b38f93 | 733 | |
a71fe8b8 | 734 | assert(s->event->n_sources > 0); |
fd38203a | 735 | |
a71fe8b8 | 736 | switch (s->type) { |
fd38203a | 737 | |
a71fe8b8 LP |
738 | case SOURCE_IO: |
739 | if (s->io.fd >= 0) | |
740 | source_io_unregister(s); | |
fd38203a | 741 | |
a71fe8b8 | 742 | break; |
6a0f1f6d | 743 | |
a71fe8b8 | 744 | case SOURCE_TIME_REALTIME: |
a8548816 | 745 | case SOURCE_TIME_BOOTTIME: |
a71fe8b8 LP |
746 | case SOURCE_TIME_MONOTONIC: |
747 | case SOURCE_TIME_REALTIME_ALARM: | |
748 | case SOURCE_TIME_BOOTTIME_ALARM: { | |
749 | struct clock_data *d; | |
fd38203a | 750 | |
a71fe8b8 LP |
751 | d = event_get_clock_data(s->event, s->type); |
752 | assert(d); | |
753 | ||
754 | prioq_remove(d->earliest, s, &s->time.earliest_index); | |
755 | prioq_remove(d->latest, s, &s->time.latest_index); | |
212bbb17 | 756 | d->needs_rearm = true; |
a71fe8b8 LP |
757 | break; |
758 | } | |
759 | ||
760 | case SOURCE_SIGNAL: | |
761 | if (s->signal.sig > 0) { | |
9da4cb2b | 762 | |
a71fe8b8 LP |
763 | if (s->event->signal_sources) |
764 | s->event->signal_sources[s->signal.sig] = NULL; | |
4807d2d0 | 765 | |
9da4cb2b | 766 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
6a0f1f6d | 767 | } |
fd38203a | 768 | |
a71fe8b8 | 769 | break; |
fd38203a | 770 | |
a71fe8b8 LP |
771 | case SOURCE_CHILD: |
772 | if (s->child.pid > 0) { | |
773 | if (s->enabled != SD_EVENT_OFF) { | |
774 | assert(s->event->n_enabled_child_sources > 0); | |
775 | s->event->n_enabled_child_sources--; | |
4807d2d0 | 776 | } |
fd38203a | 777 | |
4a0b58c4 | 778 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
a71fe8b8 | 779 | } |
fd38203a | 780 | |
f8f3f926 LP |
781 | if (EVENT_SOURCE_WATCH_PIDFD(s)) |
782 | source_child_pidfd_unregister(s); | |
783 | else | |
784 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
785 | ||
a71fe8b8 | 786 | break; |
fd38203a | 787 | |
a71fe8b8 LP |
788 | case SOURCE_DEFER: |
789 | /* nothing */ | |
790 | break; | |
fd38203a | 791 | |
a71fe8b8 LP |
792 | case SOURCE_POST: |
793 | set_remove(s->event->post_sources, s); | |
794 | break; | |
da7e457c | 795 | |
a71fe8b8 LP |
796 | case SOURCE_EXIT: |
797 | prioq_remove(s->event->exit, s, &s->exit.prioq_index); | |
798 | break; | |
0eb2e0e3 | 799 | |
97ef5391 LP |
800 | case SOURCE_INOTIFY: { |
801 | struct inode_data *inode_data; | |
802 | ||
803 | inode_data = s->inotify.inode_data; | |
804 | if (inode_data) { | |
805 | struct inotify_data *inotify_data; | |
806 | assert_se(inotify_data = inode_data->inotify_data); | |
807 | ||
808 | /* Detach this event source from the inode object */ | |
809 | LIST_REMOVE(inotify.by_inode_data, inode_data->event_sources, s); | |
810 | s->inotify.inode_data = NULL; | |
811 | ||
812 | if (s->pending) { | |
813 | assert(inotify_data->n_pending > 0); | |
814 | inotify_data->n_pending--; | |
815 | } | |
816 | ||
817 | /* Note that we don't reduce the inotify mask for the watch descriptor here if the inode is | |
818 | * continued to being watched. That's because inotify doesn't really have an API for that: we | |
819 | * can only change watch masks with access to the original inode either by fd or by path. But | |
820 | * paths aren't stable, and keeping an O_PATH fd open all the time would mean wasting an fd | |
f21f31b2 | 821 | * continuously and keeping the mount busy which we can't really do. We could reconstruct the |
97ef5391 LP |
822 | * original inode from /proc/self/fdinfo/$INOTIFY_FD (as all watch descriptors are listed |
823 | * there), but given the need for open_by_handle_at() which is privileged and not universally | |
824 | * available this would be quite an incomplete solution. Hence we go the other way, leave the | |
825 | * mask set, even if it is not minimized now, and ignore all events we aren't interested in | |
826 | * anymore after reception. Yes, this sucks, but … Linux … */ | |
827 | ||
828 | /* Maybe release the inode data (and its inotify) */ | |
829 | event_gc_inode_data(s->event, inode_data); | |
830 | } | |
831 | ||
832 | break; | |
833 | } | |
834 | ||
a71fe8b8 LP |
835 | default: |
836 | assert_not_reached("Wut? I shouldn't exist."); | |
837 | } | |
6e9feda3 | 838 | |
a71fe8b8 LP |
839 | if (s->pending) |
840 | prioq_remove(s->event->pending, s, &s->pending_index); | |
9d3e3aa5 | 841 | |
a71fe8b8 LP |
842 | if (s->prepare) |
843 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
fd38203a | 844 | |
e514aa1e | 845 | event = TAKE_PTR(s->event); |
a71fe8b8 LP |
846 | LIST_REMOVE(sources, event->sources, s); |
847 | event->n_sources--; | |
fd38203a | 848 | |
f5982559 LP |
849 | /* Note that we don't invalidate the type here, since we still need it in order to close the fd or |
850 | * pidfd associated with this event source, which we'll do only on source_free(). */ | |
851 | ||
a71fe8b8 LP |
852 | if (!s->floating) |
853 | sd_event_unref(event); | |
854 | } | |
855 | ||
856 | static void source_free(sd_event_source *s) { | |
857 | assert(s); | |
fd38203a | 858 | |
a71fe8b8 | 859 | source_disconnect(s); |
ab93297c NM |
860 | |
861 | if (s->type == SOURCE_IO && s->io.owned) | |
15723a1d LP |
862 | s->io.fd = safe_close(s->io.fd); |
863 | ||
f8f3f926 LP |
864 | if (s->type == SOURCE_CHILD) { |
865 | /* Eventually the kernel will do this automatically for us, but for now let's emulate this (unreliably) in userspace. */ | |
866 | ||
867 | if (s->child.process_owned) { | |
868 | ||
869 | if (!s->child.exited) { | |
870 | bool sent = false; | |
871 | ||
872 | if (s->child.pidfd >= 0) { | |
873 | if (pidfd_send_signal(s->child.pidfd, SIGKILL, NULL, 0) < 0) { | |
874 | if (errno == ESRCH) /* Already dead */ | |
875 | sent = true; | |
876 | else if (!ERRNO_IS_NOT_SUPPORTED(errno)) | |
877 | log_debug_errno(errno, "Failed to kill process " PID_FMT " via pidfd_send_signal(), re-trying via kill(): %m", | |
878 | s->child.pid); | |
879 | } else | |
880 | sent = true; | |
881 | } | |
882 | ||
883 | if (!sent) | |
884 | if (kill(s->child.pid, SIGKILL) < 0) | |
885 | if (errno != ESRCH) /* Already dead */ | |
886 | log_debug_errno(errno, "Failed to kill process " PID_FMT " via kill(), ignoring: %m", | |
887 | s->child.pid); | |
888 | } | |
889 | ||
890 | if (!s->child.waited) { | |
891 | siginfo_t si = {}; | |
892 | ||
893 | /* Reap the child if we can */ | |
894 | (void) waitid(P_PID, s->child.pid, &si, WEXITED); | |
895 | } | |
896 | } | |
897 | ||
898 | if (s->child.pidfd_owned) | |
899 | s->child.pidfd = safe_close(s->child.pidfd); | |
900 | } | |
901 | ||
15723a1d LP |
902 | if (s->destroy_callback) |
903 | s->destroy_callback(s->userdata); | |
ab93297c | 904 | |
356779df | 905 | free(s->description); |
fd38203a LP |
906 | free(s); |
907 | } | |
8c75fe17 | 908 | DEFINE_TRIVIAL_CLEANUP_FUNC(sd_event_source*, source_free); |
fd38203a LP |
909 | |
910 | static int source_set_pending(sd_event_source *s, bool b) { | |
911 | int r; | |
912 | ||
913 | assert(s); | |
6203e07a | 914 | assert(s->type != SOURCE_EXIT); |
fd38203a LP |
915 | |
916 | if (s->pending == b) | |
917 | return 0; | |
918 | ||
919 | s->pending = b; | |
920 | ||
921 | if (b) { | |
922 | s->pending_iteration = s->event->iteration; | |
923 | ||
924 | r = prioq_put(s->event->pending, s, &s->pending_index); | |
925 | if (r < 0) { | |
926 | s->pending = false; | |
927 | return r; | |
928 | } | |
929 | } else | |
930 | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); | |
931 | ||
e1951c16 MS |
932 | if (EVENT_SOURCE_IS_TIME(s->type)) |
933 | event_source_time_prioq_reshuffle(s); | |
2576a19e | 934 | |
9da4cb2b LP |
935 | if (s->type == SOURCE_SIGNAL && !b) { |
936 | struct signal_data *d; | |
937 | ||
938 | d = hashmap_get(s->event->signal_data, &s->priority); | |
939 | if (d && d->current == s) | |
940 | d->current = NULL; | |
941 | } | |
942 | ||
97ef5391 LP |
943 | if (s->type == SOURCE_INOTIFY) { |
944 | ||
945 | assert(s->inotify.inode_data); | |
946 | assert(s->inotify.inode_data->inotify_data); | |
947 | ||
948 | if (b) | |
949 | s->inotify.inode_data->inotify_data->n_pending ++; | |
950 | else { | |
951 | assert(s->inotify.inode_data->inotify_data->n_pending > 0); | |
952 | s->inotify.inode_data->inotify_data->n_pending --; | |
953 | } | |
954 | } | |
955 | ||
fd38203a LP |
956 | return 0; |
957 | } | |
958 | ||
a71fe8b8 | 959 | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
fd38203a LP |
960 | sd_event_source *s; |
961 | ||
962 | assert(e); | |
963 | ||
d08eb1fa | 964 | s = new(sd_event_source, 1); |
fd38203a LP |
965 | if (!s) |
966 | return NULL; | |
967 | ||
d08eb1fa LP |
968 | *s = (struct sd_event_source) { |
969 | .n_ref = 1, | |
970 | .event = e, | |
971 | .floating = floating, | |
972 | .type = type, | |
973 | .pending_index = PRIOQ_IDX_NULL, | |
974 | .prepare_index = PRIOQ_IDX_NULL, | |
975 | }; | |
a71fe8b8 LP |
976 | |
977 | if (!floating) | |
978 | sd_event_ref(e); | |
fd38203a | 979 | |
a71fe8b8 | 980 | LIST_PREPEND(sources, e->sources, s); |
313cefa1 | 981 | e->n_sources++; |
15b38f93 | 982 | |
fd38203a LP |
983 | return s; |
984 | } | |
985 | ||
b9350e70 LP |
986 | static int io_exit_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
987 | assert(s); | |
988 | ||
989 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
990 | } | |
991 | ||
f7262a9f | 992 | _public_ int sd_event_add_io( |
fd38203a | 993 | sd_event *e, |
151b9b96 | 994 | sd_event_source **ret, |
fd38203a LP |
995 | int fd, |
996 | uint32_t events, | |
718db961 | 997 | sd_event_io_handler_t callback, |
151b9b96 | 998 | void *userdata) { |
fd38203a | 999 | |
ec766a51 | 1000 | _cleanup_(source_freep) sd_event_source *s = NULL; |
fd38203a LP |
1001 | int r; |
1002 | ||
305f78bf | 1003 | assert_return(e, -EINVAL); |
b937d761 | 1004 | assert_return(e = event_resolve(e), -ENOPKG); |
8ac43fee | 1005 | assert_return(fd >= 0, -EBADF); |
2a16a986 | 1006 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 1007 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1008 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1009 | |
b9350e70 LP |
1010 | if (!callback) |
1011 | callback = io_exit_callback; | |
1012 | ||
a71fe8b8 | 1013 | s = source_new(e, !ret, SOURCE_IO); |
fd38203a LP |
1014 | if (!s) |
1015 | return -ENOMEM; | |
1016 | ||
9da4cb2b | 1017 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
1018 | s->io.fd = fd; |
1019 | s->io.events = events; | |
1020 | s->io.callback = callback; | |
1021 | s->userdata = userdata; | |
baf76283 | 1022 | s->enabled = SD_EVENT_ON; |
fd38203a | 1023 | |
baf76283 | 1024 | r = source_io_register(s, s->enabled, events); |
ec766a51 | 1025 | if (r < 0) |
050f74f2 | 1026 | return r; |
fd38203a | 1027 | |
a71fe8b8 LP |
1028 | if (ret) |
1029 | *ret = s; | |
ec766a51 | 1030 | TAKE_PTR(s); |
a71fe8b8 | 1031 | |
fd38203a LP |
1032 | return 0; |
1033 | } | |
1034 | ||
52444dc4 LP |
1035 | static void initialize_perturb(sd_event *e) { |
1036 | sd_id128_t bootid = {}; | |
1037 | ||
1038 | /* When we sleep for longer, we try to realign the wakeup to | |
f21f31b2 | 1039 | the same time within each minute/second/250ms, so that |
52444dc4 LP |
1040 | events all across the system can be coalesced into a single |
1041 | CPU wakeup. However, let's take some system-specific | |
1042 | randomness for this value, so that in a network of systems | |
1043 | with synced clocks timer events are distributed a | |
1044 | bit. Here, we calculate a perturbation usec offset from the | |
1045 | boot ID. */ | |
1046 | ||
3a43da28 | 1047 | if (_likely_(e->perturb != USEC_INFINITY)) |
52444dc4 LP |
1048 | return; |
1049 | ||
1050 | if (sd_id128_get_boot(&bootid) >= 0) | |
1051 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; | |
1052 | } | |
1053 | ||
fd38203a LP |
1054 | static int event_setup_timer_fd( |
1055 | sd_event *e, | |
6a0f1f6d LP |
1056 | struct clock_data *d, |
1057 | clockid_t clock) { | |
fd38203a | 1058 | |
fd38203a | 1059 | assert(e); |
6a0f1f6d | 1060 | assert(d); |
fd38203a | 1061 | |
6a0f1f6d | 1062 | if (_likely_(d->fd >= 0)) |
fd38203a LP |
1063 | return 0; |
1064 | ||
b44d87e2 | 1065 | _cleanup_close_ int fd = -1; |
b44d87e2 | 1066 | |
6a0f1f6d | 1067 | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
fd38203a LP |
1068 | if (fd < 0) |
1069 | return -errno; | |
1070 | ||
7fe2903c LP |
1071 | fd = fd_move_above_stdio(fd); |
1072 | ||
1eac7948 | 1073 | struct epoll_event ev = { |
a82f89aa LP |
1074 | .events = EPOLLIN, |
1075 | .data.ptr = d, | |
1076 | }; | |
fd38203a | 1077 | |
15c689d7 | 1078 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) |
fd38203a | 1079 | return -errno; |
fd38203a | 1080 | |
b44d87e2 | 1081 | d->fd = TAKE_FD(fd); |
fd38203a LP |
1082 | return 0; |
1083 | } | |
1084 | ||
c4f1aff2 TG |
1085 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
1086 | assert(s); | |
1087 | ||
1088 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1089 | } | |
1090 | ||
6a0f1f6d | 1091 | _public_ int sd_event_add_time( |
fd38203a | 1092 | sd_event *e, |
151b9b96 | 1093 | sd_event_source **ret, |
6a0f1f6d | 1094 | clockid_t clock, |
fd38203a | 1095 | uint64_t usec, |
c2ba3ad6 | 1096 | uint64_t accuracy, |
718db961 | 1097 | sd_event_time_handler_t callback, |
151b9b96 | 1098 | void *userdata) { |
fd38203a | 1099 | |
6a0f1f6d | 1100 | EventSourceType type; |
ec766a51 | 1101 | _cleanup_(source_freep) sd_event_source *s = NULL; |
6a0f1f6d | 1102 | struct clock_data *d; |
fd38203a LP |
1103 | int r; |
1104 | ||
305f78bf | 1105 | assert_return(e, -EINVAL); |
b937d761 | 1106 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf | 1107 | assert_return(accuracy != (uint64_t) -1, -EINVAL); |
da7e457c | 1108 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1109 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1110 | |
e475d10c LP |
1111 | if (!clock_supported(clock)) /* Checks whether the kernel supports the clock */ |
1112 | return -EOPNOTSUPP; | |
1113 | ||
1114 | type = clock_to_event_source_type(clock); /* checks whether sd-event supports this clock */ | |
1115 | if (type < 0) | |
3411372e LP |
1116 | return -EOPNOTSUPP; |
1117 | ||
c4f1aff2 TG |
1118 | if (!callback) |
1119 | callback = time_exit_callback; | |
1120 | ||
6a0f1f6d LP |
1121 | d = event_get_clock_data(e, type); |
1122 | assert(d); | |
c2ba3ad6 | 1123 | |
c983e776 EV |
1124 | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1125 | if (r < 0) | |
1126 | return r; | |
fd38203a | 1127 | |
c983e776 EV |
1128 | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1129 | if (r < 0) | |
1130 | return r; | |
fd38203a | 1131 | |
6a0f1f6d LP |
1132 | if (d->fd < 0) { |
1133 | r = event_setup_timer_fd(e, d, clock); | |
fd38203a LP |
1134 | if (r < 0) |
1135 | return r; | |
1136 | } | |
1137 | ||
a71fe8b8 | 1138 | s = source_new(e, !ret, type); |
fd38203a LP |
1139 | if (!s) |
1140 | return -ENOMEM; | |
1141 | ||
1142 | s->time.next = usec; | |
c2ba3ad6 | 1143 | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
fd38203a | 1144 | s->time.callback = callback; |
da7e457c | 1145 | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
fd38203a | 1146 | s->userdata = userdata; |
baf76283 | 1147 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1148 | |
e07bbb7c TG |
1149 | d->needs_rearm = true; |
1150 | ||
6a0f1f6d | 1151 | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
c2ba3ad6 | 1152 | if (r < 0) |
ec766a51 | 1153 | return r; |
c2ba3ad6 | 1154 | |
6a0f1f6d | 1155 | r = prioq_put(d->latest, s, &s->time.latest_index); |
c2ba3ad6 | 1156 | if (r < 0) |
ec766a51 | 1157 | return r; |
fd38203a | 1158 | |
a71fe8b8 LP |
1159 | if (ret) |
1160 | *ret = s; | |
ec766a51 | 1161 | TAKE_PTR(s); |
a71fe8b8 | 1162 | |
fd38203a LP |
1163 | return 0; |
1164 | } | |
1165 | ||
d6a83dc4 LP |
1166 | _public_ int sd_event_add_time_relative( |
1167 | sd_event *e, | |
1168 | sd_event_source **ret, | |
1169 | clockid_t clock, | |
1170 | uint64_t usec, | |
1171 | uint64_t accuracy, | |
1172 | sd_event_time_handler_t callback, | |
1173 | void *userdata) { | |
1174 | ||
1175 | usec_t t; | |
1176 | int r; | |
1177 | ||
1178 | /* Same as sd_event_add_time() but operates relative to the event loop's current point in time, and | |
1179 | * checks for overflow. */ | |
1180 | ||
1181 | r = sd_event_now(e, clock, &t); | |
1182 | if (r < 0) | |
1183 | return r; | |
1184 | ||
1185 | if (usec >= USEC_INFINITY - t) | |
1186 | return -EOVERFLOW; | |
1187 | ||
1188 | return sd_event_add_time(e, ret, clock, t + usec, accuracy, callback, userdata); | |
1189 | } | |
1190 | ||
59bc1fd7 LP |
1191 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1192 | assert(s); | |
1193 | ||
1194 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1195 | } | |
1196 | ||
f7262a9f | 1197 | _public_ int sd_event_add_signal( |
305f78bf | 1198 | sd_event *e, |
151b9b96 | 1199 | sd_event_source **ret, |
305f78bf | 1200 | int sig, |
718db961 | 1201 | sd_event_signal_handler_t callback, |
151b9b96 | 1202 | void *userdata) { |
305f78bf | 1203 | |
ec766a51 | 1204 | _cleanup_(source_freep) sd_event_source *s = NULL; |
9da4cb2b | 1205 | struct signal_data *d; |
fd38203a LP |
1206 | int r; |
1207 | ||
305f78bf | 1208 | assert_return(e, -EINVAL); |
b937d761 | 1209 | assert_return(e = event_resolve(e), -ENOPKG); |
6eb7c172 | 1210 | assert_return(SIGNAL_VALID(sig), -EINVAL); |
da7e457c | 1211 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1212 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1213 | |
59bc1fd7 LP |
1214 | if (!callback) |
1215 | callback = signal_exit_callback; | |
1216 | ||
d1b75241 LP |
1217 | r = signal_is_blocked(sig); |
1218 | if (r < 0) | |
1219 | return r; | |
1220 | if (r == 0) | |
3022d74b LP |
1221 | return -EBUSY; |
1222 | ||
fd38203a LP |
1223 | if (!e->signal_sources) { |
1224 | e->signal_sources = new0(sd_event_source*, _NSIG); | |
1225 | if (!e->signal_sources) | |
1226 | return -ENOMEM; | |
1227 | } else if (e->signal_sources[sig]) | |
1228 | return -EBUSY; | |
1229 | ||
a71fe8b8 | 1230 | s = source_new(e, !ret, SOURCE_SIGNAL); |
fd38203a LP |
1231 | if (!s) |
1232 | return -ENOMEM; | |
1233 | ||
1234 | s->signal.sig = sig; | |
1235 | s->signal.callback = callback; | |
1236 | s->userdata = userdata; | |
baf76283 | 1237 | s->enabled = SD_EVENT_ON; |
fd38203a LP |
1238 | |
1239 | e->signal_sources[sig] = s; | |
fd38203a | 1240 | |
9da4cb2b | 1241 | r = event_make_signal_data(e, sig, &d); |
ec766a51 | 1242 | if (r < 0) |
9da4cb2b | 1243 | return r; |
fd38203a | 1244 | |
f1f00dbb LP |
1245 | /* Use the signal name as description for the event source by default */ |
1246 | (void) sd_event_source_set_description(s, signal_to_string(sig)); | |
1247 | ||
a71fe8b8 LP |
1248 | if (ret) |
1249 | *ret = s; | |
ec766a51 | 1250 | TAKE_PTR(s); |
a71fe8b8 | 1251 | |
fd38203a LP |
1252 | return 0; |
1253 | } | |
1254 | ||
b9350e70 LP |
1255 | static int child_exit_callback(sd_event_source *s, const siginfo_t *si, void *userdata) { |
1256 | assert(s); | |
1257 | ||
1258 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1259 | } | |
1260 | ||
f8f3f926 LP |
1261 | static bool shall_use_pidfd(void) { |
1262 | /* Mostly relevant for debugging, i.e. this is used in test-event.c to test the event loop once with and once without pidfd */ | |
1263 | return getenv_bool_secure("SYSTEMD_PIDFD") != 0; | |
1264 | } | |
1265 | ||
f7262a9f | 1266 | _public_ int sd_event_add_child( |
305f78bf | 1267 | sd_event *e, |
151b9b96 | 1268 | sd_event_source **ret, |
305f78bf LP |
1269 | pid_t pid, |
1270 | int options, | |
718db961 | 1271 | sd_event_child_handler_t callback, |
151b9b96 | 1272 | void *userdata) { |
305f78bf | 1273 | |
ec766a51 | 1274 | _cleanup_(source_freep) sd_event_source *s = NULL; |
fd38203a LP |
1275 | int r; |
1276 | ||
305f78bf | 1277 | assert_return(e, -EINVAL); |
b937d761 | 1278 | assert_return(e = event_resolve(e), -ENOPKG); |
305f78bf LP |
1279 | assert_return(pid > 1, -EINVAL); |
1280 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1281 | assert_return(options != 0, -EINVAL); | |
da7e457c | 1282 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1283 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1284 | |
b9350e70 LP |
1285 | if (!callback) |
1286 | callback = child_exit_callback; | |
1287 | ||
ee880b37 LP |
1288 | if (e->n_enabled_child_sources == 0) { |
1289 | /* Caller must block SIGCHLD before using us to watch children, even if pidfd is available, | |
1290 | * for compatibility with pre-pidfd and because we don't want the reap the child processes | |
1291 | * ourselves, i.e. call waitid(), and don't want Linux' default internal logic for that to | |
1292 | * take effect. | |
1293 | * | |
1294 | * (As an optimization we only do this check on the first child event source created.) */ | |
1295 | r = signal_is_blocked(SIGCHLD); | |
1296 | if (r < 0) | |
1297 | return r; | |
1298 | if (r == 0) | |
1299 | return -EBUSY; | |
1300 | } | |
1301 | ||
d5099efc | 1302 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
fd38203a LP |
1303 | if (r < 0) |
1304 | return r; | |
1305 | ||
4a0b58c4 | 1306 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
fd38203a LP |
1307 | return -EBUSY; |
1308 | ||
a71fe8b8 | 1309 | s = source_new(e, !ret, SOURCE_CHILD); |
fd38203a LP |
1310 | if (!s) |
1311 | return -ENOMEM; | |
1312 | ||
f8f3f926 | 1313 | s->wakeup = WAKEUP_EVENT_SOURCE; |
fd38203a LP |
1314 | s->child.pid = pid; |
1315 | s->child.options = options; | |
1316 | s->child.callback = callback; | |
1317 | s->userdata = userdata; | |
baf76283 | 1318 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a | 1319 | |
f8f3f926 LP |
1320 | /* We always take a pidfd here if we can, even if we wait for anything else than WEXITED, so that we |
1321 | * pin the PID, and make regular waitid() handling race-free. */ | |
1322 | ||
1323 | if (shall_use_pidfd()) { | |
1324 | s->child.pidfd = pidfd_open(s->child.pid, 0); | |
1325 | if (s->child.pidfd < 0) { | |
1326 | /* Propagate errors unless the syscall is not supported or blocked */ | |
1327 | if (!ERRNO_IS_NOT_SUPPORTED(errno) && !ERRNO_IS_PRIVILEGE(errno)) | |
1328 | return -errno; | |
1329 | } else | |
1330 | s->child.pidfd_owned = true; /* If we allocate the pidfd we own it by default */ | |
1331 | } else | |
1332 | s->child.pidfd = -1; | |
1333 | ||
4a0b58c4 | 1334 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
ec766a51 | 1335 | if (r < 0) |
fd38203a | 1336 | return r; |
fd38203a | 1337 | |
f8f3f926 LP |
1338 | if (EVENT_SOURCE_WATCH_PIDFD(s)) { |
1339 | /* We have a pidfd and we only want to watch for exit */ | |
f8f3f926 | 1340 | r = source_child_pidfd_register(s, s->enabled); |
ac9f2640 | 1341 | if (r < 0) |
f8f3f926 | 1342 | return r; |
ac9f2640 | 1343 | |
f8f3f926 LP |
1344 | } else { |
1345 | /* We have no pidfd or we shall wait for some other event than WEXITED */ | |
f8f3f926 | 1346 | r = event_make_signal_data(e, SIGCHLD, NULL); |
ac9f2640 | 1347 | if (r < 0) |
f8f3f926 | 1348 | return r; |
f8f3f926 LP |
1349 | |
1350 | e->need_process_child = true; | |
1351 | } | |
c2ba3ad6 | 1352 | |
ac9f2640 ZJS |
1353 | e->n_enabled_child_sources++; |
1354 | ||
a71fe8b8 LP |
1355 | if (ret) |
1356 | *ret = s; | |
ec766a51 | 1357 | TAKE_PTR(s); |
f8f3f926 LP |
1358 | return 0; |
1359 | } | |
1360 | ||
1361 | _public_ int sd_event_add_child_pidfd( | |
1362 | sd_event *e, | |
1363 | sd_event_source **ret, | |
1364 | int pidfd, | |
1365 | int options, | |
1366 | sd_event_child_handler_t callback, | |
1367 | void *userdata) { | |
1368 | ||
1369 | ||
1370 | _cleanup_(source_freep) sd_event_source *s = NULL; | |
1371 | pid_t pid; | |
1372 | int r; | |
1373 | ||
1374 | assert_return(e, -EINVAL); | |
1375 | assert_return(e = event_resolve(e), -ENOPKG); | |
1376 | assert_return(pidfd >= 0, -EBADF); | |
1377 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); | |
1378 | assert_return(options != 0, -EINVAL); | |
f8f3f926 LP |
1379 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1380 | assert_return(!event_pid_changed(e), -ECHILD); | |
1381 | ||
b9350e70 LP |
1382 | if (!callback) |
1383 | callback = child_exit_callback; | |
1384 | ||
ee880b37 LP |
1385 | if (e->n_enabled_child_sources == 0) { |
1386 | r = signal_is_blocked(SIGCHLD); | |
1387 | if (r < 0) | |
1388 | return r; | |
1389 | if (r == 0) | |
1390 | return -EBUSY; | |
1391 | } | |
1392 | ||
f8f3f926 LP |
1393 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
1394 | if (r < 0) | |
1395 | return r; | |
1396 | ||
1397 | r = pidfd_get_pid(pidfd, &pid); | |
1398 | if (r < 0) | |
1399 | return r; | |
1400 | ||
1401 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) | |
1402 | return -EBUSY; | |
1403 | ||
1404 | s = source_new(e, !ret, SOURCE_CHILD); | |
1405 | if (!s) | |
1406 | return -ENOMEM; | |
1407 | ||
1408 | s->wakeup = WAKEUP_EVENT_SOURCE; | |
1409 | s->child.pidfd = pidfd; | |
1410 | s->child.pid = pid; | |
1411 | s->child.options = options; | |
1412 | s->child.callback = callback; | |
1413 | 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) */ | |
1414 | s->userdata = userdata; | |
1415 | s->enabled = SD_EVENT_ONESHOT; | |
1416 | ||
1417 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); | |
1418 | if (r < 0) | |
1419 | return r; | |
1420 | ||
f8f3f926 LP |
1421 | if (EVENT_SOURCE_WATCH_PIDFD(s)) { |
1422 | /* We only want to watch for WEXITED */ | |
f8f3f926 | 1423 | r = source_child_pidfd_register(s, s->enabled); |
ac9f2640 | 1424 | if (r < 0) |
f8f3f926 | 1425 | return r; |
f8f3f926 LP |
1426 | } else { |
1427 | /* We shall wait for some other event than WEXITED */ | |
f8f3f926 | 1428 | r = event_make_signal_data(e, SIGCHLD, NULL); |
ac9f2640 | 1429 | if (r < 0) |
f8f3f926 | 1430 | return r; |
a71fe8b8 | 1431 | |
f8f3f926 LP |
1432 | e->need_process_child = true; |
1433 | } | |
1434 | ||
ac9f2640 ZJS |
1435 | e->n_enabled_child_sources++; |
1436 | ||
f8f3f926 LP |
1437 | if (ret) |
1438 | *ret = s; | |
f8f3f926 | 1439 | TAKE_PTR(s); |
fd38203a LP |
1440 | return 0; |
1441 | } | |
1442 | ||
b9350e70 LP |
1443 | static int generic_exit_callback(sd_event_source *s, void *userdata) { |
1444 | assert(s); | |
1445 | ||
1446 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1447 | } | |
1448 | ||
f7262a9f | 1449 | _public_ int sd_event_add_defer( |
305f78bf | 1450 | sd_event *e, |
151b9b96 | 1451 | sd_event_source **ret, |
718db961 | 1452 | sd_event_handler_t callback, |
151b9b96 | 1453 | void *userdata) { |
305f78bf | 1454 | |
ec766a51 | 1455 | _cleanup_(source_freep) sd_event_source *s = NULL; |
fd38203a LP |
1456 | int r; |
1457 | ||
305f78bf | 1458 | assert_return(e, -EINVAL); |
b937d761 | 1459 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c | 1460 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1461 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 1462 | |
b9350e70 LP |
1463 | if (!callback) |
1464 | callback = generic_exit_callback; | |
1465 | ||
a71fe8b8 | 1466 | s = source_new(e, !ret, SOURCE_DEFER); |
fd38203a LP |
1467 | if (!s) |
1468 | return -ENOMEM; | |
1469 | ||
1470 | s->defer.callback = callback; | |
1471 | s->userdata = userdata; | |
baf76283 | 1472 | s->enabled = SD_EVENT_ONESHOT; |
fd38203a LP |
1473 | |
1474 | r = source_set_pending(s, true); | |
ec766a51 | 1475 | if (r < 0) |
fd38203a | 1476 | return r; |
fd38203a | 1477 | |
a71fe8b8 LP |
1478 | if (ret) |
1479 | *ret = s; | |
ec766a51 | 1480 | TAKE_PTR(s); |
a71fe8b8 | 1481 | |
fd38203a LP |
1482 | return 0; |
1483 | } | |
1484 | ||
6e9feda3 LP |
1485 | _public_ int sd_event_add_post( |
1486 | sd_event *e, | |
1487 | sd_event_source **ret, | |
1488 | sd_event_handler_t callback, | |
1489 | void *userdata) { | |
1490 | ||
ec766a51 | 1491 | _cleanup_(source_freep) sd_event_source *s = NULL; |
6e9feda3 LP |
1492 | int r; |
1493 | ||
1494 | assert_return(e, -EINVAL); | |
b937d761 | 1495 | assert_return(e = event_resolve(e), -ENOPKG); |
6e9feda3 LP |
1496 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1497 | assert_return(!event_pid_changed(e), -ECHILD); | |
1498 | ||
b9350e70 LP |
1499 | if (!callback) |
1500 | callback = generic_exit_callback; | |
1501 | ||
a71fe8b8 | 1502 | s = source_new(e, !ret, SOURCE_POST); |
6e9feda3 LP |
1503 | if (!s) |
1504 | return -ENOMEM; | |
1505 | ||
1506 | s->post.callback = callback; | |
1507 | s->userdata = userdata; | |
1508 | s->enabled = SD_EVENT_ON; | |
1509 | ||
de7fef4b | 1510 | r = set_ensure_put(&e->post_sources, NULL, s); |
ec766a51 | 1511 | if (r < 0) |
6e9feda3 | 1512 | return r; |
de7fef4b | 1513 | assert(r > 0); |
6e9feda3 | 1514 | |
a71fe8b8 LP |
1515 | if (ret) |
1516 | *ret = s; | |
ec766a51 | 1517 | TAKE_PTR(s); |
a71fe8b8 | 1518 | |
6e9feda3 LP |
1519 | return 0; |
1520 | } | |
1521 | ||
6203e07a | 1522 | _public_ int sd_event_add_exit( |
305f78bf | 1523 | sd_event *e, |
151b9b96 | 1524 | sd_event_source **ret, |
718db961 | 1525 | sd_event_handler_t callback, |
151b9b96 | 1526 | void *userdata) { |
305f78bf | 1527 | |
ec766a51 | 1528 | _cleanup_(source_freep) sd_event_source *s = NULL; |
da7e457c LP |
1529 | int r; |
1530 | ||
1531 | assert_return(e, -EINVAL); | |
b937d761 | 1532 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
1533 | assert_return(callback, -EINVAL); |
1534 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
1535 | assert_return(!event_pid_changed(e), -ECHILD); | |
1536 | ||
c983e776 EV |
1537 | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1538 | if (r < 0) | |
1539 | return r; | |
da7e457c | 1540 | |
a71fe8b8 | 1541 | s = source_new(e, !ret, SOURCE_EXIT); |
fd38203a | 1542 | if (!s) |
da7e457c | 1543 | return -ENOMEM; |
fd38203a | 1544 | |
6203e07a | 1545 | s->exit.callback = callback; |
da7e457c | 1546 | s->userdata = userdata; |
6203e07a | 1547 | s->exit.prioq_index = PRIOQ_IDX_NULL; |
baf76283 | 1548 | s->enabled = SD_EVENT_ONESHOT; |
da7e457c | 1549 | |
6203e07a | 1550 | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
ec766a51 | 1551 | if (r < 0) |
da7e457c | 1552 | return r; |
da7e457c | 1553 | |
a71fe8b8 LP |
1554 | if (ret) |
1555 | *ret = s; | |
ec766a51 | 1556 | TAKE_PTR(s); |
a71fe8b8 | 1557 | |
da7e457c LP |
1558 | return 0; |
1559 | } | |
1560 | ||
97ef5391 LP |
1561 | static void event_free_inotify_data(sd_event *e, struct inotify_data *d) { |
1562 | assert(e); | |
1563 | ||
1564 | if (!d) | |
1565 | return; | |
1566 | ||
1567 | assert(hashmap_isempty(d->inodes)); | |
1568 | assert(hashmap_isempty(d->wd)); | |
1569 | ||
1570 | if (d->buffer_filled > 0) | |
1571 | LIST_REMOVE(buffered, e->inotify_data_buffered, d); | |
1572 | ||
1573 | hashmap_free(d->inodes); | |
1574 | hashmap_free(d->wd); | |
1575 | ||
1576 | assert_se(hashmap_remove(e->inotify_data, &d->priority) == d); | |
1577 | ||
1578 | if (d->fd >= 0) { | |
1579 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, d->fd, NULL) < 0) | |
1580 | log_debug_errno(errno, "Failed to remove inotify fd from epoll, ignoring: %m"); | |
1581 | ||
1582 | safe_close(d->fd); | |
1583 | } | |
1584 | free(d); | |
1585 | } | |
1586 | ||
1587 | static int event_make_inotify_data( | |
1588 | sd_event *e, | |
1589 | int64_t priority, | |
1590 | struct inotify_data **ret) { | |
1591 | ||
1592 | _cleanup_close_ int fd = -1; | |
1593 | struct inotify_data *d; | |
97ef5391 LP |
1594 | int r; |
1595 | ||
1596 | assert(e); | |
1597 | ||
1598 | d = hashmap_get(e->inotify_data, &priority); | |
1599 | if (d) { | |
1600 | if (ret) | |
1601 | *ret = d; | |
1602 | return 0; | |
1603 | } | |
1604 | ||
1605 | fd = inotify_init1(IN_NONBLOCK|O_CLOEXEC); | |
1606 | if (fd < 0) | |
1607 | return -errno; | |
1608 | ||
1609 | fd = fd_move_above_stdio(fd); | |
1610 | ||
1611 | r = hashmap_ensure_allocated(&e->inotify_data, &uint64_hash_ops); | |
1612 | if (r < 0) | |
1613 | return r; | |
1614 | ||
1615 | d = new(struct inotify_data, 1); | |
1616 | if (!d) | |
1617 | return -ENOMEM; | |
1618 | ||
1619 | *d = (struct inotify_data) { | |
1620 | .wakeup = WAKEUP_INOTIFY_DATA, | |
1621 | .fd = TAKE_FD(fd), | |
1622 | .priority = priority, | |
1623 | }; | |
1624 | ||
1625 | r = hashmap_put(e->inotify_data, &d->priority, d); | |
1626 | if (r < 0) { | |
1627 | d->fd = safe_close(d->fd); | |
1628 | free(d); | |
1629 | return r; | |
1630 | } | |
1631 | ||
1eac7948 | 1632 | struct epoll_event ev = { |
97ef5391 LP |
1633 | .events = EPOLLIN, |
1634 | .data.ptr = d, | |
1635 | }; | |
1636 | ||
1637 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev) < 0) { | |
1638 | r = -errno; | |
1639 | d->fd = safe_close(d->fd); /* let's close this ourselves, as event_free_inotify_data() would otherwise | |
1640 | * remove the fd from the epoll first, which we don't want as we couldn't | |
1641 | * add it in the first place. */ | |
1642 | event_free_inotify_data(e, d); | |
1643 | return r; | |
1644 | } | |
1645 | ||
1646 | if (ret) | |
1647 | *ret = d; | |
1648 | ||
1649 | return 1; | |
1650 | } | |
1651 | ||
7a08d314 | 1652 | static int inode_data_compare(const struct inode_data *x, const struct inode_data *y) { |
90c88092 | 1653 | int r; |
97ef5391 LP |
1654 | |
1655 | assert(x); | |
1656 | assert(y); | |
1657 | ||
90c88092 YW |
1658 | r = CMP(x->dev, y->dev); |
1659 | if (r != 0) | |
1660 | return r; | |
97ef5391 | 1661 | |
6dd91b36 | 1662 | return CMP(x->ino, y->ino); |
97ef5391 LP |
1663 | } |
1664 | ||
7a08d314 YW |
1665 | static void inode_data_hash_func(const struct inode_data *d, struct siphash *state) { |
1666 | assert(d); | |
97ef5391 LP |
1667 | |
1668 | siphash24_compress(&d->dev, sizeof(d->dev), state); | |
1669 | siphash24_compress(&d->ino, sizeof(d->ino), state); | |
1670 | } | |
1671 | ||
7a08d314 | 1672 | DEFINE_PRIVATE_HASH_OPS(inode_data_hash_ops, struct inode_data, inode_data_hash_func, inode_data_compare); |
97ef5391 LP |
1673 | |
1674 | static void event_free_inode_data( | |
1675 | sd_event *e, | |
1676 | struct inode_data *d) { | |
1677 | ||
1678 | assert(e); | |
1679 | ||
1680 | if (!d) | |
1681 | return; | |
1682 | ||
1683 | assert(!d->event_sources); | |
1684 | ||
1685 | if (d->fd >= 0) { | |
1686 | LIST_REMOVE(to_close, e->inode_data_to_close, d); | |
1687 | safe_close(d->fd); | |
1688 | } | |
1689 | ||
1690 | if (d->inotify_data) { | |
1691 | ||
1692 | if (d->wd >= 0) { | |
1693 | if (d->inotify_data->fd >= 0) { | |
1694 | /* So here's a problem. At the time this runs the watch descriptor might already be | |
1695 | * invalidated, because an IN_IGNORED event might be queued right the moment we enter | |
1696 | * the syscall. Hence, whenever we get EINVAL, ignore it entirely, since it's a very | |
1697 | * likely case to happen. */ | |
1698 | ||
1699 | if (inotify_rm_watch(d->inotify_data->fd, d->wd) < 0 && errno != EINVAL) | |
1700 | log_debug_errno(errno, "Failed to remove watch descriptor %i from inotify, ignoring: %m", d->wd); | |
1701 | } | |
1702 | ||
1703 | assert_se(hashmap_remove(d->inotify_data->wd, INT_TO_PTR(d->wd)) == d); | |
1704 | } | |
1705 | ||
1706 | assert_se(hashmap_remove(d->inotify_data->inodes, d) == d); | |
1707 | } | |
1708 | ||
1709 | free(d); | |
1710 | } | |
1711 | ||
1712 | static void event_gc_inode_data( | |
1713 | sd_event *e, | |
1714 | struct inode_data *d) { | |
1715 | ||
1716 | struct inotify_data *inotify_data; | |
1717 | ||
1718 | assert(e); | |
1719 | ||
1720 | if (!d) | |
1721 | return; | |
1722 | ||
1723 | if (d->event_sources) | |
1724 | return; | |
1725 | ||
1726 | inotify_data = d->inotify_data; | |
1727 | event_free_inode_data(e, d); | |
1728 | ||
1729 | if (inotify_data && hashmap_isempty(inotify_data->inodes)) | |
1730 | event_free_inotify_data(e, inotify_data); | |
1731 | } | |
1732 | ||
1733 | static int event_make_inode_data( | |
1734 | sd_event *e, | |
1735 | struct inotify_data *inotify_data, | |
1736 | dev_t dev, | |
1737 | ino_t ino, | |
1738 | struct inode_data **ret) { | |
1739 | ||
1740 | struct inode_data *d, key; | |
1741 | int r; | |
1742 | ||
1743 | assert(e); | |
1744 | assert(inotify_data); | |
1745 | ||
1746 | key = (struct inode_data) { | |
1747 | .ino = ino, | |
1748 | .dev = dev, | |
1749 | }; | |
1750 | ||
1751 | d = hashmap_get(inotify_data->inodes, &key); | |
1752 | if (d) { | |
1753 | if (ret) | |
1754 | *ret = d; | |
1755 | ||
1756 | return 0; | |
1757 | } | |
1758 | ||
1759 | r = hashmap_ensure_allocated(&inotify_data->inodes, &inode_data_hash_ops); | |
1760 | if (r < 0) | |
1761 | return r; | |
1762 | ||
1763 | d = new(struct inode_data, 1); | |
1764 | if (!d) | |
1765 | return -ENOMEM; | |
1766 | ||
1767 | *d = (struct inode_data) { | |
1768 | .dev = dev, | |
1769 | .ino = ino, | |
1770 | .wd = -1, | |
1771 | .fd = -1, | |
1772 | .inotify_data = inotify_data, | |
1773 | }; | |
1774 | ||
1775 | r = hashmap_put(inotify_data->inodes, d, d); | |
1776 | if (r < 0) { | |
1777 | free(d); | |
1778 | return r; | |
1779 | } | |
1780 | ||
1781 | if (ret) | |
1782 | *ret = d; | |
1783 | ||
1784 | return 1; | |
1785 | } | |
1786 | ||
1787 | static uint32_t inode_data_determine_mask(struct inode_data *d) { | |
1788 | bool excl_unlink = true; | |
1789 | uint32_t combined = 0; | |
1790 | sd_event_source *s; | |
1791 | ||
1792 | assert(d); | |
1793 | ||
1794 | /* Combines the watch masks of all event sources watching this inode. We generally just OR them together, but | |
1795 | * the IN_EXCL_UNLINK flag is ANDed instead. | |
1796 | * | |
1797 | * Note that we add all sources to the mask here, regardless whether enabled, disabled or oneshot. That's | |
1798 | * because we cannot change the mask anymore after the event source was created once, since the kernel has no | |
f21f31b2 | 1799 | * API for that. Hence we need to subscribe to the maximum mask we ever might be interested in, and suppress |
97ef5391 LP |
1800 | * events we don't care for client-side. */ |
1801 | ||
1802 | LIST_FOREACH(inotify.by_inode_data, s, d->event_sources) { | |
1803 | ||
1804 | if ((s->inotify.mask & IN_EXCL_UNLINK) == 0) | |
1805 | excl_unlink = false; | |
1806 | ||
1807 | combined |= s->inotify.mask; | |
1808 | } | |
1809 | ||
1810 | return (combined & ~(IN_ONESHOT|IN_DONT_FOLLOW|IN_ONLYDIR|IN_EXCL_UNLINK)) | (excl_unlink ? IN_EXCL_UNLINK : 0); | |
1811 | } | |
1812 | ||
1813 | static int inode_data_realize_watch(sd_event *e, struct inode_data *d) { | |
1814 | uint32_t combined_mask; | |
1815 | int wd, r; | |
1816 | ||
1817 | assert(d); | |
1818 | assert(d->fd >= 0); | |
1819 | ||
1820 | combined_mask = inode_data_determine_mask(d); | |
1821 | ||
1822 | if (d->wd >= 0 && combined_mask == d->combined_mask) | |
1823 | return 0; | |
1824 | ||
1825 | r = hashmap_ensure_allocated(&d->inotify_data->wd, NULL); | |
1826 | if (r < 0) | |
1827 | return r; | |
1828 | ||
1829 | wd = inotify_add_watch_fd(d->inotify_data->fd, d->fd, combined_mask); | |
1830 | if (wd < 0) | |
1831 | return -errno; | |
1832 | ||
1833 | if (d->wd < 0) { | |
1834 | r = hashmap_put(d->inotify_data->wd, INT_TO_PTR(wd), d); | |
1835 | if (r < 0) { | |
1836 | (void) inotify_rm_watch(d->inotify_data->fd, wd); | |
1837 | return r; | |
1838 | } | |
1839 | ||
1840 | d->wd = wd; | |
1841 | ||
1842 | } else if (d->wd != wd) { | |
1843 | ||
1844 | log_debug("Weird, the watch descriptor we already knew for this inode changed?"); | |
1845 | (void) inotify_rm_watch(d->fd, wd); | |
1846 | return -EINVAL; | |
1847 | } | |
1848 | ||
1849 | d->combined_mask = combined_mask; | |
1850 | return 1; | |
1851 | } | |
1852 | ||
b9350e70 LP |
1853 | static int inotify_exit_callback(sd_event_source *s, const struct inotify_event *event, void *userdata) { |
1854 | assert(s); | |
1855 | ||
1856 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); | |
1857 | } | |
1858 | ||
97ef5391 LP |
1859 | _public_ int sd_event_add_inotify( |
1860 | sd_event *e, | |
1861 | sd_event_source **ret, | |
1862 | const char *path, | |
1863 | uint32_t mask, | |
1864 | sd_event_inotify_handler_t callback, | |
1865 | void *userdata) { | |
1866 | ||
97ef5391 LP |
1867 | struct inotify_data *inotify_data = NULL; |
1868 | struct inode_data *inode_data = NULL; | |
1869 | _cleanup_close_ int fd = -1; | |
8c75fe17 | 1870 | _cleanup_(source_freep) sd_event_source *s = NULL; |
97ef5391 LP |
1871 | struct stat st; |
1872 | int r; | |
1873 | ||
1874 | assert_return(e, -EINVAL); | |
1875 | assert_return(e = event_resolve(e), -ENOPKG); | |
1876 | assert_return(path, -EINVAL); | |
97ef5391 LP |
1877 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1878 | assert_return(!event_pid_changed(e), -ECHILD); | |
1879 | ||
b9350e70 LP |
1880 | if (!callback) |
1881 | callback = inotify_exit_callback; | |
1882 | ||
97ef5391 LP |
1883 | /* Refuse IN_MASK_ADD since we coalesce watches on the same inode, and hence really don't want to merge |
1884 | * masks. Or in other words, this whole code exists only to manage IN_MASK_ADD type operations for you, hence | |
1885 | * the user can't use them for us. */ | |
1886 | if (mask & IN_MASK_ADD) | |
1887 | return -EINVAL; | |
1888 | ||
1889 | fd = open(path, O_PATH|O_CLOEXEC| | |
1890 | (mask & IN_ONLYDIR ? O_DIRECTORY : 0)| | |
1891 | (mask & IN_DONT_FOLLOW ? O_NOFOLLOW : 0)); | |
1892 | if (fd < 0) | |
1893 | return -errno; | |
1894 | ||
1895 | if (fstat(fd, &st) < 0) | |
1896 | return -errno; | |
1897 | ||
1898 | s = source_new(e, !ret, SOURCE_INOTIFY); | |
1899 | if (!s) | |
1900 | return -ENOMEM; | |
1901 | ||
1902 | s->enabled = mask & IN_ONESHOT ? SD_EVENT_ONESHOT : SD_EVENT_ON; | |
1903 | s->inotify.mask = mask; | |
1904 | s->inotify.callback = callback; | |
1905 | s->userdata = userdata; | |
1906 | ||
1907 | /* Allocate an inotify object for this priority, and an inode object within it */ | |
1908 | r = event_make_inotify_data(e, SD_EVENT_PRIORITY_NORMAL, &inotify_data); | |
1909 | if (r < 0) | |
8c75fe17 | 1910 | return r; |
97ef5391 LP |
1911 | |
1912 | r = event_make_inode_data(e, inotify_data, st.st_dev, st.st_ino, &inode_data); | |
8c75fe17 ZJS |
1913 | if (r < 0) { |
1914 | event_free_inotify_data(e, inotify_data); | |
1915 | return r; | |
1916 | } | |
97ef5391 LP |
1917 | |
1918 | /* Keep the O_PATH fd around until the first iteration of the loop, so that we can still change the priority of | |
1919 | * the event source, until then, for which we need the original inode. */ | |
1920 | if (inode_data->fd < 0) { | |
1921 | inode_data->fd = TAKE_FD(fd); | |
1922 | LIST_PREPEND(to_close, e->inode_data_to_close, inode_data); | |
1923 | } | |
1924 | ||
1925 | /* Link our event source to the inode data object */ | |
1926 | LIST_PREPEND(inotify.by_inode_data, inode_data->event_sources, s); | |
1927 | s->inotify.inode_data = inode_data; | |
1928 | ||
97ef5391 LP |
1929 | /* Actually realize the watch now */ |
1930 | r = inode_data_realize_watch(e, inode_data); | |
1931 | if (r < 0) | |
8c75fe17 | 1932 | return r; |
97ef5391 LP |
1933 | |
1934 | (void) sd_event_source_set_description(s, path); | |
1935 | ||
1936 | if (ret) | |
1937 | *ret = s; | |
8c75fe17 | 1938 | TAKE_PTR(s); |
97ef5391 LP |
1939 | |
1940 | return 0; | |
97ef5391 LP |
1941 | } |
1942 | ||
8301aa0b | 1943 | static sd_event_source* event_source_free(sd_event_source *s) { |
6680dd6b LP |
1944 | if (!s) |
1945 | return NULL; | |
da7e457c | 1946 | |
8301aa0b YW |
1947 | /* Here's a special hack: when we are called from a |
1948 | * dispatch handler we won't free the event source | |
1949 | * immediately, but we will detach the fd from the | |
1950 | * epoll. This way it is safe for the caller to unref | |
1951 | * the event source and immediately close the fd, but | |
1952 | * we still retain a valid event source object after | |
1953 | * the callback. */ | |
fd38203a | 1954 | |
8301aa0b YW |
1955 | if (s->dispatching) { |
1956 | if (s->type == SOURCE_IO) | |
1957 | source_io_unregister(s); | |
fd38203a | 1958 | |
8301aa0b YW |
1959 | source_disconnect(s); |
1960 | } else | |
1961 | source_free(s); | |
fd38203a LP |
1962 | |
1963 | return NULL; | |
1964 | } | |
1965 | ||
8301aa0b YW |
1966 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_event_source, sd_event_source, event_source_free); |
1967 | ||
356779df | 1968 | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
f7f53e9e | 1969 | assert_return(s, -EINVAL); |
f4b2933e | 1970 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1971 | |
356779df | 1972 | return free_and_strdup(&s->description, description); |
f7f53e9e TG |
1973 | } |
1974 | ||
356779df | 1975 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
f7f53e9e | 1976 | assert_return(s, -EINVAL); |
356779df | 1977 | assert_return(description, -EINVAL); |
f4b2933e | 1978 | assert_return(!event_pid_changed(s->event), -ECHILD); |
f7f53e9e | 1979 | |
7d92a1a4 ZJS |
1980 | if (!s->description) |
1981 | return -ENXIO; | |
1982 | ||
356779df | 1983 | *description = s->description; |
f7f53e9e TG |
1984 | return 0; |
1985 | } | |
1986 | ||
adcc4ca3 | 1987 | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
305f78bf | 1988 | assert_return(s, NULL); |
eaa3cbef LP |
1989 | |
1990 | return s->event; | |
1991 | } | |
1992 | ||
f7262a9f | 1993 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
305f78bf | 1994 | assert_return(s, -EINVAL); |
6203e07a | 1995 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c | 1996 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 1997 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
1998 | |
1999 | return s->pending; | |
2000 | } | |
2001 | ||
f7262a9f | 2002 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
305f78bf LP |
2003 | assert_return(s, -EINVAL); |
2004 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2005 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
2006 | |
2007 | return s->io.fd; | |
2008 | } | |
2009 | ||
30caf8f3 LP |
2010 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
2011 | int r; | |
2012 | ||
2013 | assert_return(s, -EINVAL); | |
8ac43fee | 2014 | assert_return(fd >= 0, -EBADF); |
30caf8f3 LP |
2015 | assert_return(s->type == SOURCE_IO, -EDOM); |
2016 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2017 | ||
2018 | if (s->io.fd == fd) | |
2019 | return 0; | |
2020 | ||
2021 | if (s->enabled == SD_EVENT_OFF) { | |
2022 | s->io.fd = fd; | |
2023 | s->io.registered = false; | |
2024 | } else { | |
2025 | int saved_fd; | |
2026 | ||
2027 | saved_fd = s->io.fd; | |
2028 | assert(s->io.registered); | |
2029 | ||
2030 | s->io.fd = fd; | |
2031 | s->io.registered = false; | |
2032 | ||
2033 | r = source_io_register(s, s->enabled, s->io.events); | |
2034 | if (r < 0) { | |
2035 | s->io.fd = saved_fd; | |
2036 | s->io.registered = true; | |
2037 | return r; | |
2038 | } | |
2039 | ||
5a795bff | 2040 | (void) epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); |
30caf8f3 LP |
2041 | } |
2042 | ||
2043 | return 0; | |
2044 | } | |
2045 | ||
ab93297c NM |
2046 | _public_ int sd_event_source_get_io_fd_own(sd_event_source *s) { |
2047 | assert_return(s, -EINVAL); | |
2048 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2049 | ||
2050 | return s->io.owned; | |
2051 | } | |
2052 | ||
2053 | _public_ int sd_event_source_set_io_fd_own(sd_event_source *s, int own) { | |
2054 | assert_return(s, -EINVAL); | |
2055 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2056 | ||
2057 | s->io.owned = own; | |
2058 | return 0; | |
2059 | } | |
2060 | ||
f7262a9f | 2061 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
305f78bf LP |
2062 | assert_return(s, -EINVAL); |
2063 | assert_return(events, -EINVAL); | |
2064 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2065 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
2066 | |
2067 | *events = s->io.events; | |
2068 | return 0; | |
2069 | } | |
2070 | ||
f7262a9f | 2071 | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
fd38203a LP |
2072 | int r; |
2073 | ||
305f78bf LP |
2074 | assert_return(s, -EINVAL); |
2075 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2a16a986 | 2076 | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
da7e457c | 2077 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 2078 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 2079 | |
b63c8d4f DH |
2080 | /* edge-triggered updates are never skipped, so we can reset edges */ |
2081 | if (s->io.events == events && !(events & EPOLLET)) | |
fd38203a LP |
2082 | return 0; |
2083 | ||
2a0dc6cd LP |
2084 | r = source_set_pending(s, false); |
2085 | if (r < 0) | |
2086 | return r; | |
2087 | ||
baf76283 | 2088 | if (s->enabled != SD_EVENT_OFF) { |
e4715127 | 2089 | r = source_io_register(s, s->enabled, events); |
fd38203a LP |
2090 | if (r < 0) |
2091 | return r; | |
2092 | } | |
2093 | ||
2094 | s->io.events = events; | |
2095 | ||
2096 | return 0; | |
2097 | } | |
2098 | ||
f7262a9f | 2099 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
305f78bf LP |
2100 | assert_return(s, -EINVAL); |
2101 | assert_return(revents, -EINVAL); | |
2102 | assert_return(s->type == SOURCE_IO, -EDOM); | |
2103 | assert_return(s->pending, -ENODATA); | |
2104 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
2105 | |
2106 | *revents = s->io.revents; | |
2107 | return 0; | |
2108 | } | |
2109 | ||
f7262a9f | 2110 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
305f78bf LP |
2111 | assert_return(s, -EINVAL); |
2112 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); | |
2113 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
2114 | |
2115 | return s->signal.sig; | |
2116 | } | |
2117 | ||
31927c16 | 2118 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
305f78bf LP |
2119 | assert_return(s, -EINVAL); |
2120 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 2121 | |
6680b8d1 ME |
2122 | *priority = s->priority; |
2123 | return 0; | |
fd38203a LP |
2124 | } |
2125 | ||
31927c16 | 2126 | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
97ef5391 LP |
2127 | bool rm_inotify = false, rm_inode = false; |
2128 | struct inotify_data *new_inotify_data = NULL; | |
2129 | struct inode_data *new_inode_data = NULL; | |
9da4cb2b LP |
2130 | int r; |
2131 | ||
305f78bf | 2132 | assert_return(s, -EINVAL); |
da7e457c | 2133 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 2134 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
2135 | |
2136 | if (s->priority == priority) | |
2137 | return 0; | |
2138 | ||
97ef5391 LP |
2139 | if (s->type == SOURCE_INOTIFY) { |
2140 | struct inode_data *old_inode_data; | |
2141 | ||
2142 | assert(s->inotify.inode_data); | |
2143 | old_inode_data = s->inotify.inode_data; | |
2144 | ||
2145 | /* We need the original fd to change the priority. If we don't have it we can't change the priority, | |
2146 | * anymore. Note that we close any fds when entering the next event loop iteration, i.e. for inotify | |
2147 | * events we allow priority changes only until the first following iteration. */ | |
2148 | if (old_inode_data->fd < 0) | |
2149 | return -EOPNOTSUPP; | |
2150 | ||
2151 | r = event_make_inotify_data(s->event, priority, &new_inotify_data); | |
2152 | if (r < 0) | |
2153 | return r; | |
2154 | rm_inotify = r > 0; | |
2155 | ||
2156 | r = event_make_inode_data(s->event, new_inotify_data, old_inode_data->dev, old_inode_data->ino, &new_inode_data); | |
2157 | if (r < 0) | |
2158 | goto fail; | |
2159 | rm_inode = r > 0; | |
2160 | ||
2161 | if (new_inode_data->fd < 0) { | |
2162 | /* Duplicate the fd for the new inode object if we don't have any yet */ | |
2163 | new_inode_data->fd = fcntl(old_inode_data->fd, F_DUPFD_CLOEXEC, 3); | |
2164 | if (new_inode_data->fd < 0) { | |
2165 | r = -errno; | |
2166 | goto fail; | |
2167 | } | |
2168 | ||
2169 | LIST_PREPEND(to_close, s->event->inode_data_to_close, new_inode_data); | |
2170 | } | |
2171 | ||
2172 | /* Move the event source to the new inode data structure */ | |
2173 | LIST_REMOVE(inotify.by_inode_data, old_inode_data->event_sources, s); | |
2174 | LIST_PREPEND(inotify.by_inode_data, new_inode_data->event_sources, s); | |
2175 | s->inotify.inode_data = new_inode_data; | |
2176 | ||
2177 | /* Now create the new watch */ | |
2178 | r = inode_data_realize_watch(s->event, new_inode_data); | |
2179 | if (r < 0) { | |
2180 | /* Move it back */ | |
2181 | LIST_REMOVE(inotify.by_inode_data, new_inode_data->event_sources, s); | |
2182 | LIST_PREPEND(inotify.by_inode_data, old_inode_data->event_sources, s); | |
2183 | s->inotify.inode_data = old_inode_data; | |
2184 | goto fail; | |
2185 | } | |
2186 | ||
2187 | s->priority = priority; | |
2188 | ||
2189 | event_gc_inode_data(s->event, old_inode_data); | |
2190 | ||
2191 | } else if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { | |
9da4cb2b LP |
2192 | struct signal_data *old, *d; |
2193 | ||
2194 | /* Move us from the signalfd belonging to the old | |
2195 | * priority to the signalfd of the new priority */ | |
2196 | ||
2197 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); | |
2198 | ||
2199 | s->priority = priority; | |
2200 | ||
2201 | r = event_make_signal_data(s->event, s->signal.sig, &d); | |
2202 | if (r < 0) { | |
2203 | s->priority = old->priority; | |
2204 | return r; | |
2205 | } | |
2206 | ||
2207 | event_unmask_signal_data(s->event, old, s->signal.sig); | |
2208 | } else | |
2209 | s->priority = priority; | |
fd38203a | 2210 | |
e1951c16 | 2211 | event_source_pp_prioq_reshuffle(s); |
fd38203a | 2212 | |
6203e07a LP |
2213 | if (s->type == SOURCE_EXIT) |
2214 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
305f78bf | 2215 | |
fd38203a | 2216 | return 0; |
97ef5391 LP |
2217 | |
2218 | fail: | |
2219 | if (rm_inode) | |
2220 | event_free_inode_data(s->event, new_inode_data); | |
2221 | ||
2222 | if (rm_inotify) | |
2223 | event_free_inotify_data(s->event, new_inotify_data); | |
2224 | ||
2225 | return r; | |
fd38203a LP |
2226 | } |
2227 | ||
f7262a9f | 2228 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
305f78bf | 2229 | assert_return(s, -EINVAL); |
305f78bf | 2230 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 2231 | |
08c1eb0e ZJS |
2232 | if (m) |
2233 | *m = s->enabled; | |
2234 | return s->enabled != SD_EVENT_OFF; | |
fd38203a LP |
2235 | } |
2236 | ||
ddfde737 | 2237 | static int event_source_disable(sd_event_source *s) { |
fd38203a LP |
2238 | int r; |
2239 | ||
ddfde737 LP |
2240 | assert(s); |
2241 | assert(s->enabled != SD_EVENT_OFF); | |
fd38203a | 2242 | |
ddfde737 LP |
2243 | /* Unset the pending flag when this event source is disabled */ |
2244 | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { | |
2245 | r = source_set_pending(s, false); | |
2246 | if (r < 0) | |
2247 | return r; | |
2248 | } | |
cc567911 | 2249 | |
ddfde737 | 2250 | s->enabled = SD_EVENT_OFF; |
fd38203a | 2251 | |
ddfde737 | 2252 | switch (s->type) { |
fd38203a | 2253 | |
ddfde737 LP |
2254 | case SOURCE_IO: |
2255 | source_io_unregister(s); | |
2256 | break; | |
ac989a78 | 2257 | |
ddfde737 LP |
2258 | case SOURCE_TIME_REALTIME: |
2259 | case SOURCE_TIME_BOOTTIME: | |
2260 | case SOURCE_TIME_MONOTONIC: | |
2261 | case SOURCE_TIME_REALTIME_ALARM: | |
2262 | case SOURCE_TIME_BOOTTIME_ALARM: | |
2263 | event_source_time_prioq_reshuffle(s); | |
2264 | break; | |
fd38203a | 2265 | |
ddfde737 LP |
2266 | case SOURCE_SIGNAL: |
2267 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); | |
2268 | break; | |
fd38203a | 2269 | |
ddfde737 LP |
2270 | case SOURCE_CHILD: |
2271 | assert(s->event->n_enabled_child_sources > 0); | |
2272 | s->event->n_enabled_child_sources--; | |
fd38203a | 2273 | |
ddfde737 LP |
2274 | if (EVENT_SOURCE_WATCH_PIDFD(s)) |
2275 | source_child_pidfd_unregister(s); | |
2276 | else | |
2277 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); | |
2278 | break; | |
4807d2d0 | 2279 | |
ddfde737 LP |
2280 | case SOURCE_EXIT: |
2281 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
2282 | break; | |
fd38203a | 2283 | |
ddfde737 LP |
2284 | case SOURCE_DEFER: |
2285 | case SOURCE_POST: | |
2286 | case SOURCE_INOTIFY: | |
2287 | break; | |
fd38203a | 2288 | |
ddfde737 LP |
2289 | default: |
2290 | assert_not_reached("Wut? I shouldn't exist."); | |
2291 | } | |
fd38203a | 2292 | |
ddfde737 LP |
2293 | return 0; |
2294 | } | |
f8f3f926 | 2295 | |
d2eafe61 | 2296 | static int event_source_enable(sd_event_source *s, int enable) { |
ddfde737 | 2297 | int r; |
fd38203a | 2298 | |
ddfde737 | 2299 | assert(s); |
d2eafe61 | 2300 | assert(IN_SET(enable, SD_EVENT_ON, SD_EVENT_ONESHOT)); |
ddfde737 | 2301 | assert(s->enabled == SD_EVENT_OFF); |
305f78bf | 2302 | |
ddfde737 LP |
2303 | /* Unset the pending flag when this event source is enabled */ |
2304 | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { | |
2305 | r = source_set_pending(s, false); | |
2306 | if (r < 0) | |
2307 | return r; | |
2308 | } | |
9d3e3aa5 | 2309 | |
ddfde737 | 2310 | switch (s->type) { |
ddfde737 | 2311 | case SOURCE_IO: |
d2eafe61 ZJS |
2312 | r = source_io_register(s, enable, s->io.events); |
2313 | if (r < 0) | |
ddfde737 | 2314 | return r; |
ddfde737 | 2315 | break; |
fd38203a | 2316 | |
ddfde737 LP |
2317 | case SOURCE_SIGNAL: |
2318 | r = event_make_signal_data(s->event, s->signal.sig, NULL); | |
2319 | if (r < 0) { | |
ddfde737 LP |
2320 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
2321 | return r; | |
2322 | } | |
fd38203a | 2323 | |
ddfde737 | 2324 | break; |
fd38203a | 2325 | |
ddfde737 | 2326 | case SOURCE_CHILD: |
ddfde737 LP |
2327 | if (EVENT_SOURCE_WATCH_PIDFD(s)) { |
2328 | /* yes, we have pidfd */ | |
9da4cb2b | 2329 | |
d2eafe61 | 2330 | r = source_child_pidfd_register(s, enable); |
ac9f2640 | 2331 | if (r < 0) |
9da4cb2b | 2332 | return r; |
ddfde737 LP |
2333 | } else { |
2334 | /* no pidfd, or something other to watch for than WEXITED */ | |
9da4cb2b | 2335 | |
ddfde737 LP |
2336 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
2337 | if (r < 0) { | |
ddfde737 LP |
2338 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
2339 | return r; | |
2340 | } | |
2341 | } | |
fd38203a | 2342 | |
ac9f2640 ZJS |
2343 | s->event->n_enabled_child_sources++; |
2344 | ||
ddfde737 | 2345 | break; |
4807d2d0 | 2346 | |
d2eafe61 ZJS |
2347 | case SOURCE_TIME_REALTIME: |
2348 | case SOURCE_TIME_BOOTTIME: | |
2349 | case SOURCE_TIME_MONOTONIC: | |
2350 | case SOURCE_TIME_REALTIME_ALARM: | |
2351 | case SOURCE_TIME_BOOTTIME_ALARM: | |
ddfde737 | 2352 | case SOURCE_EXIT: |
ddfde737 LP |
2353 | case SOURCE_DEFER: |
2354 | case SOURCE_POST: | |
2355 | case SOURCE_INOTIFY: | |
2356 | break; | |
9da4cb2b | 2357 | |
ddfde737 LP |
2358 | default: |
2359 | assert_not_reached("Wut? I shouldn't exist."); | |
2360 | } | |
f8f3f926 | 2361 | |
d2eafe61 ZJS |
2362 | s->enabled = enable; |
2363 | ||
2364 | /* Non-failing operations below */ | |
2365 | switch (s->type) { | |
2366 | case SOURCE_TIME_REALTIME: | |
2367 | case SOURCE_TIME_BOOTTIME: | |
2368 | case SOURCE_TIME_MONOTONIC: | |
2369 | case SOURCE_TIME_REALTIME_ALARM: | |
2370 | case SOURCE_TIME_BOOTTIME_ALARM: | |
2371 | event_source_time_prioq_reshuffle(s); | |
2372 | break; | |
2373 | ||
2374 | case SOURCE_EXIT: | |
2375 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); | |
2376 | break; | |
2377 | ||
2378 | default: | |
2379 | break; | |
2380 | } | |
2381 | ||
ddfde737 LP |
2382 | return 0; |
2383 | } | |
2384 | ||
2385 | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { | |
2386 | int r; | |
9da4cb2b | 2387 | |
ddfde737 LP |
2388 | assert_return(s, -EINVAL); |
2389 | assert_return(IN_SET(m, SD_EVENT_OFF, SD_EVENT_ON, SD_EVENT_ONESHOT), -EINVAL); | |
2390 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a | 2391 | |
ddfde737 LP |
2392 | /* If we are dead anyway, we are fine with turning off sources, but everything else needs to fail. */ |
2393 | if (s->event->state == SD_EVENT_FINISHED) | |
2394 | return m == SD_EVENT_OFF ? 0 : -ESTALE; | |
305f78bf | 2395 | |
ddfde737 LP |
2396 | if (s->enabled == m) /* No change? */ |
2397 | return 0; | |
9d3e3aa5 | 2398 | |
ddfde737 LP |
2399 | if (m == SD_EVENT_OFF) |
2400 | r = event_source_disable(s); | |
2401 | else { | |
2402 | if (s->enabled != SD_EVENT_OFF) { | |
2403 | /* Switching from "on" to "oneshot" or back? If that's the case, we can take a shortcut, the | |
2404 | * event source is already enabled after all. */ | |
2405 | s->enabled = m; | |
2406 | return 0; | |
fd38203a | 2407 | } |
ddfde737 LP |
2408 | |
2409 | r = event_source_enable(s, m); | |
fd38203a | 2410 | } |
ddfde737 LP |
2411 | if (r < 0) |
2412 | return r; | |
fd38203a | 2413 | |
e1951c16 | 2414 | event_source_pp_prioq_reshuffle(s); |
fd38203a LP |
2415 | return 0; |
2416 | } | |
2417 | ||
f7262a9f | 2418 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
2419 | assert_return(s, -EINVAL); |
2420 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 2421 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf | 2422 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a LP |
2423 | |
2424 | *usec = s->time.next; | |
2425 | return 0; | |
2426 | } | |
2427 | ||
f7262a9f | 2428 | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
2a0dc6cd | 2429 | int r; |
6a0f1f6d | 2430 | |
305f78bf | 2431 | assert_return(s, -EINVAL); |
6a0f1f6d | 2432 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 2433 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 2434 | assert_return(!event_pid_changed(s->event), -ECHILD); |
fd38203a | 2435 | |
2a0dc6cd LP |
2436 | r = source_set_pending(s, false); |
2437 | if (r < 0) | |
2438 | return r; | |
2576a19e | 2439 | |
2a0dc6cd | 2440 | s->time.next = usec; |
fd38203a | 2441 | |
e1951c16 | 2442 | event_source_time_prioq_reshuffle(s); |
fd38203a LP |
2443 | return 0; |
2444 | } | |
2445 | ||
d6a83dc4 LP |
2446 | _public_ int sd_event_source_set_time_relative(sd_event_source *s, uint64_t usec) { |
2447 | usec_t t; | |
2448 | int r; | |
2449 | ||
2450 | assert_return(s, -EINVAL); | |
2451 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
2452 | ||
2453 | r = sd_event_now(s->event, event_source_type_to_clock(s->type), &t); | |
2454 | if (r < 0) | |
2455 | return r; | |
2456 | ||
2457 | if (usec >= USEC_INFINITY - t) | |
2458 | return -EOVERFLOW; | |
2459 | ||
2460 | return sd_event_source_set_time(s, t + usec); | |
2461 | } | |
2462 | ||
f7262a9f | 2463 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
305f78bf LP |
2464 | assert_return(s, -EINVAL); |
2465 | assert_return(usec, -EINVAL); | |
6a0f1f6d | 2466 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
305f78bf LP |
2467 | assert_return(!event_pid_changed(s->event), -ECHILD); |
2468 | ||
2469 | *usec = s->time.accuracy; | |
2470 | return 0; | |
2471 | } | |
2472 | ||
f7262a9f | 2473 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
2a0dc6cd | 2474 | int r; |
6a0f1f6d | 2475 | |
305f78bf LP |
2476 | assert_return(s, -EINVAL); |
2477 | assert_return(usec != (uint64_t) -1, -EINVAL); | |
6a0f1f6d | 2478 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
da7e457c | 2479 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
305f78bf | 2480 | assert_return(!event_pid_changed(s->event), -ECHILD); |
eaa3cbef | 2481 | |
2a0dc6cd LP |
2482 | r = source_set_pending(s, false); |
2483 | if (r < 0) | |
2484 | return r; | |
2485 | ||
eaa3cbef LP |
2486 | if (usec == 0) |
2487 | usec = DEFAULT_ACCURACY_USEC; | |
2488 | ||
eaa3cbef LP |
2489 | s->time.accuracy = usec; |
2490 | ||
e1951c16 | 2491 | event_source_time_prioq_reshuffle(s); |
6a0f1f6d LP |
2492 | return 0; |
2493 | } | |
2494 | ||
2495 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { | |
2496 | assert_return(s, -EINVAL); | |
2497 | assert_return(clock, -EINVAL); | |
2498 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); | |
2499 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
eaa3cbef | 2500 | |
6a0f1f6d | 2501 | *clock = event_source_type_to_clock(s->type); |
eaa3cbef LP |
2502 | return 0; |
2503 | } | |
2504 | ||
f7262a9f | 2505 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
4bee8012 LP |
2506 | assert_return(s, -EINVAL); |
2507 | assert_return(pid, -EINVAL); | |
2508 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2509 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2510 | ||
2511 | *pid = s->child.pid; | |
2512 | return 0; | |
2513 | } | |
2514 | ||
f8f3f926 LP |
2515 | _public_ int sd_event_source_get_child_pidfd(sd_event_source *s) { |
2516 | assert_return(s, -EINVAL); | |
2517 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2518 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2519 | ||
2520 | if (s->child.pidfd < 0) | |
2521 | return -EOPNOTSUPP; | |
2522 | ||
2523 | return s->child.pidfd; | |
2524 | } | |
2525 | ||
2526 | _public_ int sd_event_source_send_child_signal(sd_event_source *s, int sig, const siginfo_t *si, unsigned flags) { | |
2527 | assert_return(s, -EINVAL); | |
2528 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2529 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2530 | assert_return(SIGNAL_VALID(sig), -EINVAL); | |
2531 | ||
2532 | /* If we already have seen indication the process exited refuse sending a signal early. This way we | |
2533 | * can be sure we don't accidentally kill the wrong process on PID reuse when pidfds are not | |
2534 | * available. */ | |
2535 | if (s->child.exited) | |
2536 | return -ESRCH; | |
2537 | ||
2538 | if (s->child.pidfd >= 0) { | |
2539 | siginfo_t copy; | |
2540 | ||
2541 | /* pidfd_send_signal() changes the siginfo_t argument. This is weird, let's hence copy the | |
2542 | * structure here */ | |
2543 | if (si) | |
2544 | copy = *si; | |
2545 | ||
2546 | if (pidfd_send_signal(s->child.pidfd, sig, si ? © : NULL, 0) < 0) { | |
2547 | /* Let's propagate the error only if the system call is not implemented or prohibited */ | |
2548 | if (!ERRNO_IS_NOT_SUPPORTED(errno) && !ERRNO_IS_PRIVILEGE(errno)) | |
2549 | return -errno; | |
2550 | } else | |
2551 | return 0; | |
2552 | } | |
2553 | ||
2554 | /* Flags are only supported for pidfd_send_signal(), not for rt_sigqueueinfo(), hence let's refuse | |
2555 | * this here. */ | |
2556 | if (flags != 0) | |
2557 | return -EOPNOTSUPP; | |
2558 | ||
2559 | if (si) { | |
2560 | /* We use rt_sigqueueinfo() only if siginfo_t is specified. */ | |
2561 | siginfo_t copy = *si; | |
2562 | ||
2563 | if (rt_sigqueueinfo(s->child.pid, sig, ©) < 0) | |
2564 | return -errno; | |
2565 | } else if (kill(s->child.pid, sig) < 0) | |
2566 | return -errno; | |
2567 | ||
2568 | return 0; | |
2569 | } | |
2570 | ||
2571 | _public_ int sd_event_source_get_child_pidfd_own(sd_event_source *s) { | |
2572 | assert_return(s, -EINVAL); | |
2573 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2574 | ||
2575 | if (s->child.pidfd < 0) | |
2576 | return -EOPNOTSUPP; | |
2577 | ||
2578 | return s->child.pidfd_owned; | |
2579 | } | |
2580 | ||
2581 | _public_ int sd_event_source_set_child_pidfd_own(sd_event_source *s, int own) { | |
2582 | assert_return(s, -EINVAL); | |
2583 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2584 | ||
2585 | if (s->child.pidfd < 0) | |
2586 | return -EOPNOTSUPP; | |
2587 | ||
2588 | s->child.pidfd_owned = own; | |
2589 | return 0; | |
2590 | } | |
2591 | ||
2592 | _public_ int sd_event_source_get_child_process_own(sd_event_source *s) { | |
2593 | assert_return(s, -EINVAL); | |
2594 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2595 | ||
2596 | return s->child.process_owned; | |
2597 | } | |
2598 | ||
2599 | _public_ int sd_event_source_set_child_process_own(sd_event_source *s, int own) { | |
2600 | assert_return(s, -EINVAL); | |
2601 | assert_return(s->type == SOURCE_CHILD, -EDOM); | |
2602 | ||
2603 | s->child.process_owned = own; | |
2604 | return 0; | |
2605 | } | |
2606 | ||
97ef5391 LP |
2607 | _public_ int sd_event_source_get_inotify_mask(sd_event_source *s, uint32_t *mask) { |
2608 | assert_return(s, -EINVAL); | |
2609 | assert_return(mask, -EINVAL); | |
2610 | assert_return(s->type == SOURCE_INOTIFY, -EDOM); | |
2611 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
2612 | ||
2613 | *mask = s->inotify.mask; | |
2614 | return 0; | |
2615 | } | |
2616 | ||
718db961 | 2617 | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
fd38203a LP |
2618 | int r; |
2619 | ||
da7e457c | 2620 | assert_return(s, -EINVAL); |
6203e07a | 2621 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
da7e457c LP |
2622 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
2623 | assert_return(!event_pid_changed(s->event), -ECHILD); | |
fd38203a LP |
2624 | |
2625 | if (s->prepare == callback) | |
2626 | return 0; | |
2627 | ||
2628 | if (callback && s->prepare) { | |
2629 | s->prepare = callback; | |
2630 | return 0; | |
2631 | } | |
2632 | ||
2633 | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); | |
2634 | if (r < 0) | |
2635 | return r; | |
2636 | ||
2637 | s->prepare = callback; | |
2638 | ||
2639 | if (callback) { | |
2640 | r = prioq_put(s->event->prepare, s, &s->prepare_index); | |
2641 | if (r < 0) | |
2642 | return r; | |
2643 | } else | |
2644 | prioq_remove(s->event->prepare, s, &s->prepare_index); | |
2645 | ||
2646 | return 0; | |
2647 | } | |
2648 | ||
f7262a9f | 2649 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
da7e457c | 2650 | assert_return(s, NULL); |
fd38203a LP |
2651 | |
2652 | return s->userdata; | |
2653 | } | |
2654 | ||
8f726607 LP |
2655 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
2656 | void *ret; | |
2657 | ||
2658 | assert_return(s, NULL); | |
2659 | ||
2660 | ret = s->userdata; | |
2661 | s->userdata = userdata; | |
2662 | ||
2663 | return ret; | |
2664 | } | |
2665 | ||
c2ba3ad6 LP |
2666 | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
2667 | usec_t c; | |
2668 | assert(e); | |
2669 | assert(a <= b); | |
2670 | ||
2671 | if (a <= 0) | |
2672 | return 0; | |
393003e1 LP |
2673 | if (a >= USEC_INFINITY) |
2674 | return USEC_INFINITY; | |
c2ba3ad6 LP |
2675 | |
2676 | if (b <= a + 1) | |
2677 | return a; | |
2678 | ||
52444dc4 LP |
2679 | initialize_perturb(e); |
2680 | ||
c2ba3ad6 LP |
2681 | /* |
2682 | Find a good time to wake up again between times a and b. We | |
2683 | have two goals here: | |
2684 | ||
2685 | a) We want to wake up as seldom as possible, hence prefer | |
2686 | later times over earlier times. | |
2687 | ||
2688 | b) But if we have to wake up, then let's make sure to | |
2689 | dispatch as much as possible on the entire system. | |
2690 | ||
2691 | We implement this by waking up everywhere at the same time | |
850516e0 | 2692 | within any given minute if we can, synchronised via the |
c2ba3ad6 | 2693 | perturbation value determined from the boot ID. If we can't, |
ba276c81 LP |
2694 | then we try to find the same spot in every 10s, then 1s and |
2695 | then 250ms step. Otherwise, we pick the last possible time | |
2696 | to wake up. | |
c2ba3ad6 LP |
2697 | */ |
2698 | ||
850516e0 LP |
2699 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
2700 | if (c >= b) { | |
2701 | if (_unlikely_(c < USEC_PER_MINUTE)) | |
2702 | return b; | |
2703 | ||
2704 | c -= USEC_PER_MINUTE; | |
2705 | } | |
2706 | ||
ba276c81 LP |
2707 | if (c >= a) |
2708 | return c; | |
2709 | ||
2710 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); | |
2711 | if (c >= b) { | |
2712 | if (_unlikely_(c < USEC_PER_SEC*10)) | |
2713 | return b; | |
2714 | ||
2715 | c -= USEC_PER_SEC*10; | |
2716 | } | |
2717 | ||
850516e0 LP |
2718 | if (c >= a) |
2719 | return c; | |
2720 | ||
2721 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); | |
c2ba3ad6 LP |
2722 | if (c >= b) { |
2723 | if (_unlikely_(c < USEC_PER_SEC)) | |
2724 | return b; | |
2725 | ||
2726 | c -= USEC_PER_SEC; | |
2727 | } | |
2728 | ||
2729 | if (c >= a) | |
2730 | return c; | |
2731 | ||
2732 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); | |
2733 | if (c >= b) { | |
2734 | if (_unlikely_(c < USEC_PER_MSEC*250)) | |
2735 | return b; | |
2736 | ||
2737 | c -= USEC_PER_MSEC*250; | |
2738 | } | |
2739 | ||
2740 | if (c >= a) | |
2741 | return c; | |
2742 | ||
2743 | return b; | |
2744 | } | |
2745 | ||
fd38203a LP |
2746 | static int event_arm_timer( |
2747 | sd_event *e, | |
6a0f1f6d | 2748 | struct clock_data *d) { |
fd38203a LP |
2749 | |
2750 | struct itimerspec its = {}; | |
c2ba3ad6 LP |
2751 | sd_event_source *a, *b; |
2752 | usec_t t; | |
fd38203a | 2753 | |
cde93897 | 2754 | assert(e); |
6a0f1f6d | 2755 | assert(d); |
fd38203a | 2756 | |
d06441da | 2757 | if (!d->needs_rearm) |
212bbb17 TG |
2758 | return 0; |
2759 | else | |
2760 | d->needs_rearm = false; | |
2761 | ||
6a0f1f6d | 2762 | a = prioq_peek(d->earliest); |
393003e1 | 2763 | if (!a || a->enabled == SD_EVENT_OFF || a->time.next == USEC_INFINITY) { |
72aedc1e | 2764 | |
6a0f1f6d | 2765 | if (d->fd < 0) |
c57b5ca3 LP |
2766 | return 0; |
2767 | ||
3a43da28 | 2768 | if (d->next == USEC_INFINITY) |
72aedc1e LP |
2769 | return 0; |
2770 | ||
2771 | /* disarm */ | |
15c689d7 LP |
2772 | if (timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) |
2773 | return -errno; | |
72aedc1e | 2774 | |
3a43da28 | 2775 | d->next = USEC_INFINITY; |
fd38203a | 2776 | return 0; |
72aedc1e | 2777 | } |
fd38203a | 2778 | |
6a0f1f6d | 2779 | b = prioq_peek(d->latest); |
baf76283 | 2780 | assert_se(b && b->enabled != SD_EVENT_OFF); |
c2ba3ad6 | 2781 | |
1bce0ffa | 2782 | t = sleep_between(e, a->time.next, time_event_source_latest(b)); |
6a0f1f6d | 2783 | if (d->next == t) |
fd38203a LP |
2784 | return 0; |
2785 | ||
6a0f1f6d | 2786 | assert_se(d->fd >= 0); |
fd38203a | 2787 | |
c2ba3ad6 | 2788 | if (t == 0) { |
fd38203a LP |
2789 | /* We don' want to disarm here, just mean some time looooong ago. */ |
2790 | its.it_value.tv_sec = 0; | |
2791 | its.it_value.tv_nsec = 1; | |
2792 | } else | |
c2ba3ad6 | 2793 | timespec_store(&its.it_value, t); |
fd38203a | 2794 | |
15c689d7 | 2795 | if (timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) |
cde93897 | 2796 | return -errno; |
fd38203a | 2797 | |
6a0f1f6d | 2798 | d->next = t; |
fd38203a LP |
2799 | return 0; |
2800 | } | |
2801 | ||
9a800b56 | 2802 | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
fd38203a LP |
2803 | assert(e); |
2804 | assert(s); | |
2805 | assert(s->type == SOURCE_IO); | |
2806 | ||
9a800b56 LP |
2807 | /* If the event source was already pending, we just OR in the |
2808 | * new revents, otherwise we reset the value. The ORing is | |
2809 | * necessary to handle EPOLLONESHOT events properly where | |
2810 | * readability might happen independently of writability, and | |
2811 | * we need to keep track of both */ | |
2812 | ||
2813 | if (s->pending) | |
2814 | s->io.revents |= revents; | |
2815 | else | |
2816 | s->io.revents = revents; | |
fd38203a | 2817 | |
fd38203a LP |
2818 | return source_set_pending(s, true); |
2819 | } | |
2820 | ||
72aedc1e | 2821 | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
fd38203a LP |
2822 | uint64_t x; |
2823 | ssize_t ss; | |
2824 | ||
2825 | assert(e); | |
da7e457c | 2826 | assert(fd >= 0); |
72aedc1e | 2827 | |
305f78bf | 2828 | assert_return(events == EPOLLIN, -EIO); |
fd38203a LP |
2829 | |
2830 | ss = read(fd, &x, sizeof(x)); | |
2831 | if (ss < 0) { | |
945c2931 | 2832 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
2833 | return 0; |
2834 | ||
2835 | return -errno; | |
2836 | } | |
2837 | ||
8d35dae7 | 2838 | if (_unlikely_(ss != sizeof(x))) |
fd38203a LP |
2839 | return -EIO; |
2840 | ||
cde93897 | 2841 | if (next) |
3a43da28 | 2842 | *next = USEC_INFINITY; |
72aedc1e | 2843 | |
fd38203a LP |
2844 | return 0; |
2845 | } | |
2846 | ||
305f78bf LP |
2847 | static int process_timer( |
2848 | sd_event *e, | |
2849 | usec_t n, | |
6a0f1f6d | 2850 | struct clock_data *d) { |
305f78bf | 2851 | |
fd38203a LP |
2852 | sd_event_source *s; |
2853 | int r; | |
2854 | ||
2855 | assert(e); | |
6a0f1f6d | 2856 | assert(d); |
fd38203a LP |
2857 | |
2858 | for (;;) { | |
6a0f1f6d | 2859 | s = prioq_peek(d->earliest); |
fd38203a LP |
2860 | if (!s || |
2861 | s->time.next > n || | |
baf76283 | 2862 | s->enabled == SD_EVENT_OFF || |
fd38203a LP |
2863 | s->pending) |
2864 | break; | |
2865 | ||
2866 | r = source_set_pending(s, true); | |
2867 | if (r < 0) | |
2868 | return r; | |
2869 | ||
e1951c16 | 2870 | event_source_time_prioq_reshuffle(s); |
fd38203a LP |
2871 | } |
2872 | ||
2873 | return 0; | |
2874 | } | |
2875 | ||
2876 | static int process_child(sd_event *e) { | |
2877 | sd_event_source *s; | |
fd38203a LP |
2878 | int r; |
2879 | ||
2880 | assert(e); | |
2881 | ||
c2ba3ad6 LP |
2882 | e->need_process_child = false; |
2883 | ||
fd38203a LP |
2884 | /* |
2885 | So, this is ugly. We iteratively invoke waitid() with P_PID | |
2886 | + WNOHANG for each PID we wait for, instead of using | |
2887 | P_ALL. This is because we only want to get child | |
2888 | information of very specific child processes, and not all | |
2889 | of them. We might not have processed the SIGCHLD even of a | |
2890 | previous invocation and we don't want to maintain a | |
2891 | unbounded *per-child* event queue, hence we really don't | |
2892 | want anything flushed out of the kernel's queue that we | |
2893 | don't care about. Since this is O(n) this means that if you | |
2894 | have a lot of processes you probably want to handle SIGCHLD | |
2895 | yourself. | |
08cd1552 LP |
2896 | |
2897 | We do not reap the children here (by using WNOWAIT), this | |
2898 | is only done after the event source is dispatched so that | |
2899 | the callback still sees the process as a zombie. | |
fd38203a LP |
2900 | */ |
2901 | ||
90e74a66 | 2902 | HASHMAP_FOREACH(s, e->child_sources) { |
fd38203a LP |
2903 | assert(s->type == SOURCE_CHILD); |
2904 | ||
2905 | if (s->pending) | |
2906 | continue; | |
2907 | ||
baf76283 | 2908 | if (s->enabled == SD_EVENT_OFF) |
fd38203a LP |
2909 | continue; |
2910 | ||
f8f3f926 LP |
2911 | if (s->child.exited) |
2912 | continue; | |
2913 | ||
2914 | if (EVENT_SOURCE_WATCH_PIDFD(s)) /* There's a usable pidfd known for this event source? then don't waitid() for it here */ | |
2915 | continue; | |
2916 | ||
fd38203a | 2917 | zero(s->child.siginfo); |
15c689d7 LP |
2918 | if (waitid(P_PID, s->child.pid, &s->child.siginfo, |
2919 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options) < 0) | |
fd38203a LP |
2920 | return -errno; |
2921 | ||
2922 | if (s->child.siginfo.si_pid != 0) { | |
945c2931 | 2923 | bool zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 | 2924 | |
f8f3f926 LP |
2925 | if (zombie) |
2926 | s->child.exited = true; | |
2927 | ||
08cd1552 LP |
2928 | if (!zombie && (s->child.options & WEXITED)) { |
2929 | /* If the child isn't dead then let's | |
2930 | * immediately remove the state change | |
2931 | * from the queue, since there's no | |
2932 | * benefit in leaving it queued */ | |
2933 | ||
2934 | assert(s->child.options & (WSTOPPED|WCONTINUED)); | |
a5d27871 | 2935 | (void) waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); |
08cd1552 LP |
2936 | } |
2937 | ||
fd38203a LP |
2938 | r = source_set_pending(s, true); |
2939 | if (r < 0) | |
2940 | return r; | |
2941 | } | |
2942 | } | |
2943 | ||
fd38203a LP |
2944 | return 0; |
2945 | } | |
2946 | ||
f8f3f926 LP |
2947 | static int process_pidfd(sd_event *e, sd_event_source *s, uint32_t revents) { |
2948 | assert(e); | |
2949 | assert(s); | |
2950 | assert(s->type == SOURCE_CHILD); | |
2951 | ||
2952 | if (s->pending) | |
2953 | return 0; | |
2954 | ||
2955 | if (s->enabled == SD_EVENT_OFF) | |
2956 | return 0; | |
2957 | ||
2958 | if (!EVENT_SOURCE_WATCH_PIDFD(s)) | |
2959 | return 0; | |
2960 | ||
2961 | zero(s->child.siginfo); | |
2962 | if (waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG | WNOWAIT | s->child.options) < 0) | |
2963 | return -errno; | |
2964 | ||
2965 | if (s->child.siginfo.si_pid == 0) | |
2966 | return 0; | |
2967 | ||
2968 | if (IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED)) | |
2969 | s->child.exited = true; | |
2970 | ||
2971 | return source_set_pending(s, true); | |
2972 | } | |
2973 | ||
9da4cb2b | 2974 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
fd38203a | 2975 | bool read_one = false; |
fd38203a LP |
2976 | int r; |
2977 | ||
da7e457c | 2978 | assert(e); |
97ef5391 | 2979 | assert(d); |
305f78bf | 2980 | assert_return(events == EPOLLIN, -EIO); |
fd38203a | 2981 | |
9da4cb2b LP |
2982 | /* If there's a signal queued on this priority and SIGCHLD is |
2983 | on this priority too, then make sure to recheck the | |
2984 | children we watch. This is because we only ever dequeue | |
2985 | the first signal per priority, and if we dequeue one, and | |
2986 | SIGCHLD might be enqueued later we wouldn't know, but we | |
2987 | might have higher priority children we care about hence we | |
2988 | need to check that explicitly. */ | |
2989 | ||
2990 | if (sigismember(&d->sigset, SIGCHLD)) | |
2991 | e->need_process_child = true; | |
2992 | ||
2993 | /* If there's already an event source pending for this | |
2994 | * priority we don't read another */ | |
2995 | if (d->current) | |
2996 | return 0; | |
2997 | ||
fd38203a | 2998 | for (;;) { |
0eb2e0e3 | 2999 | struct signalfd_siginfo si; |
7057bd99 | 3000 | ssize_t n; |
92daebc0 | 3001 | sd_event_source *s = NULL; |
fd38203a | 3002 | |
9da4cb2b | 3003 | n = read(d->fd, &si, sizeof(si)); |
7057bd99 | 3004 | if (n < 0) { |
945c2931 | 3005 | if (IN_SET(errno, EAGAIN, EINTR)) |
fd38203a LP |
3006 | return read_one; |
3007 | ||
3008 | return -errno; | |
3009 | } | |
3010 | ||
7057bd99 | 3011 | if (_unlikely_(n != sizeof(si))) |
fd38203a LP |
3012 | return -EIO; |
3013 | ||
6eb7c172 | 3014 | assert(SIGNAL_VALID(si.ssi_signo)); |
7057bd99 | 3015 | |
fd38203a LP |
3016 | read_one = true; |
3017 | ||
92daebc0 LP |
3018 | if (e->signal_sources) |
3019 | s = e->signal_sources[si.ssi_signo]; | |
92daebc0 LP |
3020 | if (!s) |
3021 | continue; | |
9da4cb2b LP |
3022 | if (s->pending) |
3023 | continue; | |
fd38203a LP |
3024 | |
3025 | s->signal.siginfo = si; | |
9da4cb2b LP |
3026 | d->current = s; |
3027 | ||
fd38203a LP |
3028 | r = source_set_pending(s, true); |
3029 | if (r < 0) | |
3030 | return r; | |
9da4cb2b LP |
3031 | |
3032 | return 1; | |
fd38203a | 3033 | } |
fd38203a LP |
3034 | } |
3035 | ||
97ef5391 LP |
3036 | static int event_inotify_data_read(sd_event *e, struct inotify_data *d, uint32_t revents) { |
3037 | ssize_t n; | |
3038 | ||
3039 | assert(e); | |
3040 | assert(d); | |
3041 | ||
3042 | assert_return(revents == EPOLLIN, -EIO); | |
3043 | ||
3044 | /* If there's already an event source pending for this priority, don't read another */ | |
3045 | if (d->n_pending > 0) | |
3046 | return 0; | |
3047 | ||
3048 | /* Is the read buffer non-empty? If so, let's not read more */ | |
3049 | if (d->buffer_filled > 0) | |
3050 | return 0; | |
3051 | ||
3052 | n = read(d->fd, &d->buffer, sizeof(d->buffer)); | |
3053 | if (n < 0) { | |
3054 | if (IN_SET(errno, EAGAIN, EINTR)) | |
3055 | return 0; | |
3056 | ||
3057 | return -errno; | |
3058 | } | |
3059 | ||
3060 | assert(n > 0); | |
3061 | d->buffer_filled = (size_t) n; | |
3062 | LIST_PREPEND(buffered, e->inotify_data_buffered, d); | |
3063 | ||
3064 | return 1; | |
3065 | } | |
3066 | ||
3067 | static void event_inotify_data_drop(sd_event *e, struct inotify_data *d, size_t sz) { | |
3068 | assert(e); | |
3069 | assert(d); | |
3070 | assert(sz <= d->buffer_filled); | |
3071 | ||
3072 | if (sz == 0) | |
3073 | return; | |
3074 | ||
3075 | /* Move the rest to the buffer to the front, in order to get things properly aligned again */ | |
3076 | memmove(d->buffer.raw, d->buffer.raw + sz, d->buffer_filled - sz); | |
3077 | d->buffer_filled -= sz; | |
3078 | ||
3079 | if (d->buffer_filled == 0) | |
3080 | LIST_REMOVE(buffered, e->inotify_data_buffered, d); | |
3081 | } | |
3082 | ||
3083 | static int event_inotify_data_process(sd_event *e, struct inotify_data *d) { | |
3084 | int r; | |
3085 | ||
3086 | assert(e); | |
3087 | assert(d); | |
3088 | ||
3089 | /* If there's already an event source pending for this priority, don't read another */ | |
3090 | if (d->n_pending > 0) | |
3091 | return 0; | |
3092 | ||
3093 | while (d->buffer_filled > 0) { | |
3094 | size_t sz; | |
3095 | ||
3096 | /* Let's validate that the event structures are complete */ | |
3097 | if (d->buffer_filled < offsetof(struct inotify_event, name)) | |
3098 | return -EIO; | |
3099 | ||
3100 | sz = offsetof(struct inotify_event, name) + d->buffer.ev.len; | |
3101 | if (d->buffer_filled < sz) | |
3102 | return -EIO; | |
3103 | ||
3104 | if (d->buffer.ev.mask & IN_Q_OVERFLOW) { | |
3105 | struct inode_data *inode_data; | |
97ef5391 LP |
3106 | |
3107 | /* The queue overran, let's pass this event to all event sources connected to this inotify | |
3108 | * object */ | |
3109 | ||
90e74a66 | 3110 | HASHMAP_FOREACH(inode_data, d->inodes) { |
97ef5391 LP |
3111 | sd_event_source *s; |
3112 | ||
3113 | LIST_FOREACH(inotify.by_inode_data, s, inode_data->event_sources) { | |
3114 | ||
3115 | if (s->enabled == SD_EVENT_OFF) | |
3116 | continue; | |
3117 | ||
3118 | r = source_set_pending(s, true); | |
3119 | if (r < 0) | |
3120 | return r; | |
3121 | } | |
3122 | } | |
3123 | } else { | |
3124 | struct inode_data *inode_data; | |
3125 | sd_event_source *s; | |
3126 | ||
3127 | /* Find the inode object for this watch descriptor. If IN_IGNORED is set we also remove it from | |
3128 | * our watch descriptor table. */ | |
3129 | if (d->buffer.ev.mask & IN_IGNORED) { | |
3130 | ||
3131 | inode_data = hashmap_remove(d->wd, INT_TO_PTR(d->buffer.ev.wd)); | |
3132 | if (!inode_data) { | |
3133 | event_inotify_data_drop(e, d, sz); | |
3134 | continue; | |
3135 | } | |
3136 | ||
3137 | /* The watch descriptor was removed by the kernel, let's drop it here too */ | |
3138 | inode_data->wd = -1; | |
3139 | } else { | |
3140 | inode_data = hashmap_get(d->wd, INT_TO_PTR(d->buffer.ev.wd)); | |
3141 | if (!inode_data) { | |
3142 | event_inotify_data_drop(e, d, sz); | |
3143 | continue; | |
3144 | } | |
3145 | } | |
3146 | ||
3147 | /* Trigger all event sources that are interested in these events. Also trigger all event | |
3148 | * sources if IN_IGNORED or IN_UNMOUNT is set. */ | |
3149 | LIST_FOREACH(inotify.by_inode_data, s, inode_data->event_sources) { | |
3150 | ||
3151 | if (s->enabled == SD_EVENT_OFF) | |
3152 | continue; | |
3153 | ||
3154 | if ((d->buffer.ev.mask & (IN_IGNORED|IN_UNMOUNT)) == 0 && | |
3155 | (s->inotify.mask & d->buffer.ev.mask & IN_ALL_EVENTS) == 0) | |
3156 | continue; | |
3157 | ||
3158 | r = source_set_pending(s, true); | |
3159 | if (r < 0) | |
3160 | return r; | |
3161 | } | |
3162 | } | |
3163 | ||
3164 | /* Something pending now? If so, let's finish, otherwise let's read more. */ | |
3165 | if (d->n_pending > 0) | |
3166 | return 1; | |
3167 | } | |
3168 | ||
3169 | return 0; | |
3170 | } | |
3171 | ||
3172 | static int process_inotify(sd_event *e) { | |
3173 | struct inotify_data *d; | |
3174 | int r, done = 0; | |
3175 | ||
3176 | assert(e); | |
3177 | ||
3178 | LIST_FOREACH(buffered, d, e->inotify_data_buffered) { | |
3179 | r = event_inotify_data_process(e, d); | |
3180 | if (r < 0) | |
3181 | return r; | |
3182 | if (r > 0) | |
3183 | done ++; | |
3184 | } | |
3185 | ||
3186 | return done; | |
3187 | } | |
3188 | ||
fd38203a | 3189 | static int source_dispatch(sd_event_source *s) { |
b778cba4 | 3190 | _cleanup_(sd_event_unrefp) sd_event *saved_event = NULL; |
8f5c235d | 3191 | EventSourceType saved_type; |
fe8245eb | 3192 | int r = 0; |
fd38203a LP |
3193 | |
3194 | assert(s); | |
6203e07a | 3195 | assert(s->pending || s->type == SOURCE_EXIT); |
fd38203a | 3196 | |
b778cba4 LP |
3197 | /* Save the event source type, here, so that we still know it after the event callback which might |
3198 | * invalidate the event. */ | |
8f5c235d LP |
3199 | saved_type = s->type; |
3200 | ||
b778cba4 LP |
3201 | /* Similar, store a reference to the event loop object, so that we can still access it after the |
3202 | * callback might have invalidated/disconnected the event source. */ | |
3203 | saved_event = sd_event_ref(s->event); | |
3204 | ||
945c2931 | 3205 | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { |
da7e457c LP |
3206 | r = source_set_pending(s, false); |
3207 | if (r < 0) | |
3208 | return r; | |
3209 | } | |
fd38203a | 3210 | |
6e9feda3 LP |
3211 | if (s->type != SOURCE_POST) { |
3212 | sd_event_source *z; | |
6e9feda3 LP |
3213 | |
3214 | /* If we execute a non-post source, let's mark all | |
3215 | * post sources as pending */ | |
3216 | ||
90e74a66 | 3217 | SET_FOREACH(z, s->event->post_sources) { |
6e9feda3 LP |
3218 | if (z->enabled == SD_EVENT_OFF) |
3219 | continue; | |
3220 | ||
3221 | r = source_set_pending(z, true); | |
3222 | if (r < 0) | |
3223 | return r; | |
3224 | } | |
3225 | } | |
3226 | ||
baf76283 LP |
3227 | if (s->enabled == SD_EVENT_ONESHOT) { |
3228 | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
3229 | if (r < 0) |
3230 | return r; | |
3231 | } | |
3232 | ||
12179984 | 3233 | s->dispatching = true; |
b7484e2a | 3234 | |
fd38203a LP |
3235 | switch (s->type) { |
3236 | ||
3237 | case SOURCE_IO: | |
3238 | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); | |
3239 | break; | |
3240 | ||
6a0f1f6d | 3241 | case SOURCE_TIME_REALTIME: |
a8548816 | 3242 | case SOURCE_TIME_BOOTTIME: |
6a0f1f6d LP |
3243 | case SOURCE_TIME_MONOTONIC: |
3244 | case SOURCE_TIME_REALTIME_ALARM: | |
3245 | case SOURCE_TIME_BOOTTIME_ALARM: | |
fd38203a LP |
3246 | r = s->time.callback(s, s->time.next, s->userdata); |
3247 | break; | |
3248 | ||
3249 | case SOURCE_SIGNAL: | |
3250 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); | |
3251 | break; | |
3252 | ||
08cd1552 LP |
3253 | case SOURCE_CHILD: { |
3254 | bool zombie; | |
3255 | ||
945c2931 | 3256 | zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
08cd1552 | 3257 | |
fd38203a | 3258 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
08cd1552 LP |
3259 | |
3260 | /* Now, reap the PID for good. */ | |
f8f3f926 | 3261 | if (zombie) { |
cc59d290 | 3262 | (void) waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); |
f8f3f926 LP |
3263 | s->child.waited = true; |
3264 | } | |
08cd1552 | 3265 | |
fd38203a | 3266 | break; |
08cd1552 | 3267 | } |
fd38203a LP |
3268 | |
3269 | case SOURCE_DEFER: | |
3270 | r = s->defer.callback(s, s->userdata); | |
3271 | break; | |
da7e457c | 3272 | |
6e9feda3 LP |
3273 | case SOURCE_POST: |
3274 | r = s->post.callback(s, s->userdata); | |
3275 | break; | |
3276 | ||
6203e07a LP |
3277 | case SOURCE_EXIT: |
3278 | r = s->exit.callback(s, s->userdata); | |
da7e457c | 3279 | break; |
9d3e3aa5 | 3280 | |
97ef5391 LP |
3281 | case SOURCE_INOTIFY: { |
3282 | struct sd_event *e = s->event; | |
3283 | struct inotify_data *d; | |
3284 | size_t sz; | |
3285 | ||
3286 | assert(s->inotify.inode_data); | |
3287 | assert_se(d = s->inotify.inode_data->inotify_data); | |
3288 | ||
3289 | assert(d->buffer_filled >= offsetof(struct inotify_event, name)); | |
3290 | sz = offsetof(struct inotify_event, name) + d->buffer.ev.len; | |
3291 | assert(d->buffer_filled >= sz); | |
3292 | ||
3293 | r = s->inotify.callback(s, &d->buffer.ev, s->userdata); | |
3294 | ||
3295 | /* When no event is pending anymore on this inotify object, then let's drop the event from the | |
3296 | * buffer. */ | |
3297 | if (d->n_pending == 0) | |
3298 | event_inotify_data_drop(e, d, sz); | |
3299 | ||
3300 | break; | |
3301 | } | |
3302 | ||
9d3e3aa5 | 3303 | case SOURCE_WATCHDOG: |
a71fe8b8 | 3304 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
9f2a50a3 | 3305 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
9d3e3aa5 | 3306 | assert_not_reached("Wut? I shouldn't exist."); |
fd38203a LP |
3307 | } |
3308 | ||
12179984 LP |
3309 | s->dispatching = false; |
3310 | ||
b778cba4 LP |
3311 | if (r < 0) { |
3312 | log_debug_errno(r, "Event source %s (type %s) returned error, %s: %m", | |
3313 | strna(s->description), | |
3314 | event_source_type_to_string(saved_type), | |
3315 | s->exit_on_failure ? "exiting" : "disabling"); | |
3316 | ||
3317 | if (s->exit_on_failure) | |
3318 | (void) sd_event_exit(saved_event, r); | |
3319 | } | |
12179984 LP |
3320 | |
3321 | if (s->n_ref == 0) | |
3322 | source_free(s); | |
3323 | else if (r < 0) | |
6203e07a | 3324 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
b7484e2a | 3325 | |
6203e07a | 3326 | return 1; |
fd38203a LP |
3327 | } |
3328 | ||
3329 | static int event_prepare(sd_event *e) { | |
3330 | int r; | |
3331 | ||
3332 | assert(e); | |
3333 | ||
3334 | for (;;) { | |
3335 | sd_event_source *s; | |
3336 | ||
3337 | s = prioq_peek(e->prepare); | |
baf76283 | 3338 | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
fd38203a LP |
3339 | break; |
3340 | ||
3341 | s->prepare_iteration = e->iteration; | |
3342 | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); | |
3343 | if (r < 0) | |
3344 | return r; | |
3345 | ||
3346 | assert(s->prepare); | |
12179984 LP |
3347 | |
3348 | s->dispatching = true; | |
fd38203a | 3349 | r = s->prepare(s, s->userdata); |
12179984 LP |
3350 | s->dispatching = false; |
3351 | ||
b778cba4 LP |
3352 | if (r < 0) { |
3353 | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, %s: %m", | |
3354 | strna(s->description), | |
3355 | event_source_type_to_string(s->type), | |
3356 | s->exit_on_failure ? "exiting" : "disabling"); | |
3357 | ||
3358 | if (s->exit_on_failure) | |
3359 | (void) sd_event_exit(e, r); | |
3360 | } | |
fd38203a | 3361 | |
12179984 LP |
3362 | if (s->n_ref == 0) |
3363 | source_free(s); | |
3364 | else if (r < 0) | |
3365 | sd_event_source_set_enabled(s, SD_EVENT_OFF); | |
fd38203a LP |
3366 | } |
3367 | ||
3368 | return 0; | |
3369 | } | |
3370 | ||
6203e07a | 3371 | static int dispatch_exit(sd_event *e) { |
da7e457c | 3372 | sd_event_source *p; |
30dd293c | 3373 | _cleanup_(sd_event_unrefp) sd_event *ref = NULL; |
da7e457c LP |
3374 | int r; |
3375 | ||
3376 | assert(e); | |
3377 | ||
6203e07a | 3378 | p = prioq_peek(e->exit); |
baf76283 | 3379 | if (!p || p->enabled == SD_EVENT_OFF) { |
da7e457c LP |
3380 | e->state = SD_EVENT_FINISHED; |
3381 | return 0; | |
3382 | } | |
3383 | ||
30dd293c | 3384 | ref = sd_event_ref(e); |
da7e457c | 3385 | e->iteration++; |
6203e07a | 3386 | e->state = SD_EVENT_EXITING; |
da7e457c | 3387 | r = source_dispatch(p); |
2b0c9ef7 | 3388 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
3389 | return r; |
3390 | } | |
3391 | ||
c2ba3ad6 LP |
3392 | static sd_event_source* event_next_pending(sd_event *e) { |
3393 | sd_event_source *p; | |
3394 | ||
da7e457c LP |
3395 | assert(e); |
3396 | ||
c2ba3ad6 LP |
3397 | p = prioq_peek(e->pending); |
3398 | if (!p) | |
3399 | return NULL; | |
3400 | ||
baf76283 | 3401 | if (p->enabled == SD_EVENT_OFF) |
c2ba3ad6 LP |
3402 | return NULL; |
3403 | ||
3404 | return p; | |
3405 | } | |
3406 | ||
cde93897 LP |
3407 | static int arm_watchdog(sd_event *e) { |
3408 | struct itimerspec its = {}; | |
3409 | usec_t t; | |
cde93897 LP |
3410 | |
3411 | assert(e); | |
3412 | assert(e->watchdog_fd >= 0); | |
3413 | ||
3414 | t = sleep_between(e, | |
3415 | e->watchdog_last + (e->watchdog_period / 2), | |
3416 | e->watchdog_last + (e->watchdog_period * 3 / 4)); | |
3417 | ||
3418 | timespec_store(&its.it_value, t); | |
3419 | ||
75145780 LP |
3420 | /* Make sure we never set the watchdog to 0, which tells the |
3421 | * kernel to disable it. */ | |
3422 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) | |
3423 | its.it_value.tv_nsec = 1; | |
3424 | ||
15c689d7 | 3425 | if (timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) |
cde93897 LP |
3426 | return -errno; |
3427 | ||
3428 | return 0; | |
3429 | } | |
3430 | ||
3431 | static int process_watchdog(sd_event *e) { | |
3432 | assert(e); | |
3433 | ||
3434 | if (!e->watchdog) | |
3435 | return 0; | |
3436 | ||
3437 | /* Don't notify watchdog too often */ | |
3438 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) | |
3439 | return 0; | |
3440 | ||
3441 | sd_notify(false, "WATCHDOG=1"); | |
3442 | e->watchdog_last = e->timestamp.monotonic; | |
3443 | ||
3444 | return arm_watchdog(e); | |
3445 | } | |
3446 | ||
97ef5391 LP |
3447 | static void event_close_inode_data_fds(sd_event *e) { |
3448 | struct inode_data *d; | |
3449 | ||
3450 | assert(e); | |
3451 | ||
3452 | /* Close the fds pointing to the inodes to watch now. We need to close them as they might otherwise pin | |
3453 | * filesystems. But we can't close them right-away as we need them as long as the user still wants to make | |
5238e957 | 3454 | * adjustments to the even source, such as changing the priority (which requires us to remove and re-add a watch |
97ef5391 LP |
3455 | * for the inode). Hence, let's close them when entering the first iteration after they were added, as a |
3456 | * compromise. */ | |
3457 | ||
3458 | while ((d = e->inode_data_to_close)) { | |
3459 | assert(d->fd >= 0); | |
3460 | d->fd = safe_close(d->fd); | |
3461 | ||
3462 | LIST_REMOVE(to_close, e->inode_data_to_close, d); | |
3463 | } | |
3464 | } | |
3465 | ||
c45a5a74 TG |
3466 | _public_ int sd_event_prepare(sd_event *e) { |
3467 | int r; | |
fd38203a | 3468 | |
da7e457c | 3469 | assert_return(e, -EINVAL); |
b937d761 | 3470 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
3471 | assert_return(!event_pid_changed(e), -ECHILD); |
3472 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 3473 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 3474 | |
e5446015 LP |
3475 | /* Let's check that if we are a default event loop we are executed in the correct thread. We only do |
3476 | * this check here once, since gettid() is typically not cached, and thus want to minimize | |
3477 | * syscalls */ | |
3478 | assert_return(!e->default_event_ptr || e->tid == gettid(), -EREMOTEIO); | |
3479 | ||
6203e07a | 3480 | if (e->exit_requested) |
c45a5a74 | 3481 | goto pending; |
fd38203a LP |
3482 | |
3483 | e->iteration++; | |
3484 | ||
0be6c2f6 | 3485 | e->state = SD_EVENT_PREPARING; |
fd38203a | 3486 | r = event_prepare(e); |
0be6c2f6 | 3487 | e->state = SD_EVENT_INITIAL; |
fd38203a | 3488 | if (r < 0) |
c45a5a74 | 3489 | return r; |
fd38203a | 3490 | |
6a0f1f6d LP |
3491 | r = event_arm_timer(e, &e->realtime); |
3492 | if (r < 0) | |
c45a5a74 | 3493 | return r; |
6a0f1f6d | 3494 | |
a8548816 TG |
3495 | r = event_arm_timer(e, &e->boottime); |
3496 | if (r < 0) | |
c45a5a74 | 3497 | return r; |
a8548816 | 3498 | |
6a0f1f6d LP |
3499 | r = event_arm_timer(e, &e->monotonic); |
3500 | if (r < 0) | |
c45a5a74 | 3501 | return r; |
6a0f1f6d LP |
3502 | |
3503 | r = event_arm_timer(e, &e->realtime_alarm); | |
1b5995b0 | 3504 | if (r < 0) |
c45a5a74 | 3505 | return r; |
fd38203a | 3506 | |
6a0f1f6d | 3507 | r = event_arm_timer(e, &e->boottime_alarm); |
1b5995b0 | 3508 | if (r < 0) |
c45a5a74 | 3509 | return r; |
fd38203a | 3510 | |
97ef5391 LP |
3511 | event_close_inode_data_fds(e); |
3512 | ||
1b5995b0 | 3513 | if (event_next_pending(e) || e->need_process_child) |
c45a5a74 TG |
3514 | goto pending; |
3515 | ||
2b0c9ef7 | 3516 | e->state = SD_EVENT_ARMED; |
c45a5a74 TG |
3517 | |
3518 | return 0; | |
3519 | ||
3520 | pending: | |
2b0c9ef7 | 3521 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
3522 | r = sd_event_wait(e, 0); |
3523 | if (r == 0) | |
2b0c9ef7 | 3524 | e->state = SD_EVENT_ARMED; |
6d148a84 TG |
3525 | |
3526 | return r; | |
c45a5a74 TG |
3527 | } |
3528 | ||
3529 | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { | |
5cddd924 | 3530 | size_t event_queue_max; |
c45a5a74 TG |
3531 | int r, m, i; |
3532 | ||
3533 | assert_return(e, -EINVAL); | |
b937d761 | 3534 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
3535 | assert_return(!event_pid_changed(e), -ECHILD); |
3536 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 3537 | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
c45a5a74 TG |
3538 | |
3539 | if (e->exit_requested) { | |
3540 | e->state = SD_EVENT_PENDING; | |
3541 | return 1; | |
3542 | } | |
6a0f1f6d | 3543 | |
5cddd924 LP |
3544 | event_queue_max = MAX(e->n_sources, 1u); |
3545 | if (!GREEDY_REALLOC(e->event_queue, e->event_queue_allocated, event_queue_max)) | |
3546 | return -ENOMEM; | |
fd38203a | 3547 | |
97ef5391 LP |
3548 | /* If we still have inotify data buffered, then query the other fds, but don't wait on it */ |
3549 | if (e->inotify_data_buffered) | |
3550 | timeout = 0; | |
3551 | ||
5cddd924 | 3552 | m = epoll_wait(e->epoll_fd, e->event_queue, event_queue_max, |
bab4820e | 3553 | timeout == (uint64_t) -1 ? -1 : (int) DIV_ROUND_UP(timeout, USEC_PER_MSEC)); |
da7e457c | 3554 | if (m < 0) { |
c45a5a74 TG |
3555 | if (errno == EINTR) { |
3556 | e->state = SD_EVENT_PENDING; | |
3557 | return 1; | |
3558 | } | |
3559 | ||
3560 | r = -errno; | |
da7e457c LP |
3561 | goto finish; |
3562 | } | |
fd38203a | 3563 | |
e475d10c | 3564 | triple_timestamp_get(&e->timestamp); |
fd38203a LP |
3565 | |
3566 | for (i = 0; i < m; i++) { | |
3567 | ||
5cddd924 LP |
3568 | if (e->event_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
3569 | r = flush_timer(e, e->watchdog_fd, e->event_queue[i].events, NULL); | |
9da4cb2b | 3570 | else { |
5cddd924 | 3571 | WakeupType *t = e->event_queue[i].data.ptr; |
9da4cb2b LP |
3572 | |
3573 | switch (*t) { | |
3574 | ||
f8f3f926 | 3575 | case WAKEUP_EVENT_SOURCE: { |
5cddd924 | 3576 | sd_event_source *s = e->event_queue[i].data.ptr; |
f8f3f926 LP |
3577 | |
3578 | assert(s); | |
3579 | ||
3580 | switch (s->type) { | |
3581 | ||
3582 | case SOURCE_IO: | |
5cddd924 | 3583 | r = process_io(e, s, e->event_queue[i].events); |
f8f3f926 LP |
3584 | break; |
3585 | ||
3586 | case SOURCE_CHILD: | |
5cddd924 | 3587 | r = process_pidfd(e, s, e->event_queue[i].events); |
f8f3f926 LP |
3588 | break; |
3589 | ||
3590 | default: | |
3591 | assert_not_reached("Unexpected event source type"); | |
3592 | } | |
3593 | ||
9da4cb2b | 3594 | break; |
f8f3f926 | 3595 | } |
fd38203a | 3596 | |
9da4cb2b | 3597 | case WAKEUP_CLOCK_DATA: { |
5cddd924 | 3598 | struct clock_data *d = e->event_queue[i].data.ptr; |
f8f3f926 LP |
3599 | |
3600 | assert(d); | |
3601 | ||
5cddd924 | 3602 | r = flush_timer(e, d->fd, e->event_queue[i].events, &d->next); |
9da4cb2b LP |
3603 | break; |
3604 | } | |
3605 | ||
3606 | case WAKEUP_SIGNAL_DATA: | |
5cddd924 | 3607 | r = process_signal(e, e->event_queue[i].data.ptr, e->event_queue[i].events); |
9da4cb2b LP |
3608 | break; |
3609 | ||
97ef5391 | 3610 | case WAKEUP_INOTIFY_DATA: |
5cddd924 | 3611 | r = event_inotify_data_read(e, e->event_queue[i].data.ptr, e->event_queue[i].events); |
97ef5391 LP |
3612 | break; |
3613 | ||
9da4cb2b LP |
3614 | default: |
3615 | assert_not_reached("Invalid wake-up pointer"); | |
3616 | } | |
3617 | } | |
fd38203a | 3618 | if (r < 0) |
da7e457c | 3619 | goto finish; |
fd38203a LP |
3620 | } |
3621 | ||
cde93897 LP |
3622 | r = process_watchdog(e); |
3623 | if (r < 0) | |
3624 | goto finish; | |
3625 | ||
6a0f1f6d LP |
3626 | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
3627 | if (r < 0) | |
3628 | goto finish; | |
3629 | ||
e475d10c | 3630 | r = process_timer(e, e->timestamp.boottime, &e->boottime); |
a8548816 TG |
3631 | if (r < 0) |
3632 | goto finish; | |
3633 | ||
6a0f1f6d LP |
3634 | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
3635 | if (r < 0) | |
3636 | goto finish; | |
3637 | ||
3638 | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); | |
fd38203a | 3639 | if (r < 0) |
da7e457c | 3640 | goto finish; |
fd38203a | 3641 | |
e475d10c | 3642 | r = process_timer(e, e->timestamp.boottime, &e->boottime_alarm); |
fd38203a | 3643 | if (r < 0) |
da7e457c | 3644 | goto finish; |
fd38203a | 3645 | |
c2ba3ad6 | 3646 | if (e->need_process_child) { |
fd38203a LP |
3647 | r = process_child(e); |
3648 | if (r < 0) | |
da7e457c | 3649 | goto finish; |
fd38203a LP |
3650 | } |
3651 | ||
97ef5391 LP |
3652 | r = process_inotify(e); |
3653 | if (r < 0) | |
3654 | goto finish; | |
3655 | ||
c45a5a74 TG |
3656 | if (event_next_pending(e)) { |
3657 | e->state = SD_EVENT_PENDING; | |
3658 | ||
3659 | return 1; | |
da7e457c LP |
3660 | } |
3661 | ||
c45a5a74 | 3662 | r = 0; |
fd38203a | 3663 | |
da7e457c | 3664 | finish: |
2b0c9ef7 | 3665 | e->state = SD_EVENT_INITIAL; |
da7e457c LP |
3666 | |
3667 | return r; | |
fd38203a LP |
3668 | } |
3669 | ||
c45a5a74 TG |
3670 | _public_ int sd_event_dispatch(sd_event *e) { |
3671 | sd_event_source *p; | |
3672 | int r; | |
3673 | ||
3674 | assert_return(e, -EINVAL); | |
b937d761 | 3675 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
3676 | assert_return(!event_pid_changed(e), -ECHILD); |
3677 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
3678 | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); | |
3679 | ||
3680 | if (e->exit_requested) | |
3681 | return dispatch_exit(e); | |
3682 | ||
3683 | p = event_next_pending(e); | |
3684 | if (p) { | |
30dd293c | 3685 | _cleanup_(sd_event_unrefp) sd_event *ref = NULL; |
c45a5a74 | 3686 | |
30dd293c | 3687 | ref = sd_event_ref(e); |
c45a5a74 TG |
3688 | e->state = SD_EVENT_RUNNING; |
3689 | r = source_dispatch(p); | |
2b0c9ef7 | 3690 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
3691 | return r; |
3692 | } | |
3693 | ||
2b0c9ef7 | 3694 | e->state = SD_EVENT_INITIAL; |
c45a5a74 TG |
3695 | |
3696 | return 1; | |
3697 | } | |
3698 | ||
34b87517 | 3699 | static void event_log_delays(sd_event *e) { |
442ac269 YW |
3700 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1], *p; |
3701 | size_t l, i; | |
34b87517 | 3702 | |
442ac269 YW |
3703 | p = b; |
3704 | l = sizeof(b); | |
3705 | for (i = 0; i < ELEMENTSOF(e->delays); i++) { | |
3706 | l = strpcpyf(&p, l, "%u ", e->delays[i]); | |
34b87517 VC |
3707 | e->delays[i] = 0; |
3708 | } | |
442ac269 | 3709 | log_debug("Event loop iterations: %s", b); |
34b87517 VC |
3710 | } |
3711 | ||
c45a5a74 TG |
3712 | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
3713 | int r; | |
3714 | ||
3715 | assert_return(e, -EINVAL); | |
b937d761 | 3716 | assert_return(e = event_resolve(e), -ENOPKG); |
c45a5a74 TG |
3717 | assert_return(!event_pid_changed(e), -ECHILD); |
3718 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); | |
2b0c9ef7 | 3719 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
c45a5a74 | 3720 | |
34b87517 VC |
3721 | if (e->profile_delays && e->last_run) { |
3722 | usec_t this_run; | |
3723 | unsigned l; | |
3724 | ||
3725 | this_run = now(CLOCK_MONOTONIC); | |
3726 | ||
3727 | l = u64log2(this_run - e->last_run); | |
cb9d621e | 3728 | assert(l < ELEMENTSOF(e->delays)); |
34b87517 VC |
3729 | e->delays[l]++; |
3730 | ||
3731 | if (this_run - e->last_log >= 5*USEC_PER_SEC) { | |
3732 | event_log_delays(e); | |
3733 | e->last_log = this_run; | |
3734 | } | |
3735 | } | |
3736 | ||
c45a5a74 | 3737 | r = sd_event_prepare(e); |
53bac4e0 LP |
3738 | if (r == 0) |
3739 | /* There was nothing? Then wait... */ | |
3740 | r = sd_event_wait(e, timeout); | |
c45a5a74 | 3741 | |
34b87517 VC |
3742 | if (e->profile_delays) |
3743 | e->last_run = now(CLOCK_MONOTONIC); | |
3744 | ||
02d30981 | 3745 | if (r > 0) { |
53bac4e0 | 3746 | /* There's something now, then let's dispatch it */ |
02d30981 TG |
3747 | r = sd_event_dispatch(e); |
3748 | if (r < 0) | |
3749 | return r; | |
53bac4e0 LP |
3750 | |
3751 | return 1; | |
3752 | } | |
3753 | ||
3754 | return r; | |
c45a5a74 TG |
3755 | } |
3756 | ||
f7262a9f | 3757 | _public_ int sd_event_loop(sd_event *e) { |
30dd293c | 3758 | _cleanup_(sd_event_unrefp) sd_event *ref = NULL; |
fd38203a LP |
3759 | int r; |
3760 | ||
da7e457c | 3761 | assert_return(e, -EINVAL); |
b937d761 | 3762 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c | 3763 | assert_return(!event_pid_changed(e), -ECHILD); |
2b0c9ef7 | 3764 | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
da7e457c | 3765 | |
30dd293c | 3766 | ref = sd_event_ref(e); |
fd38203a | 3767 | |
da7e457c | 3768 | while (e->state != SD_EVENT_FINISHED) { |
fd38203a LP |
3769 | r = sd_event_run(e, (uint64_t) -1); |
3770 | if (r < 0) | |
30dd293c | 3771 | return r; |
fd38203a LP |
3772 | } |
3773 | ||
30dd293c | 3774 | return e->exit_code; |
fd38203a LP |
3775 | } |
3776 | ||
9b364545 | 3777 | _public_ int sd_event_get_fd(sd_event *e) { |
9b364545 | 3778 | assert_return(e, -EINVAL); |
b937d761 | 3779 | assert_return(e = event_resolve(e), -ENOPKG); |
9b364545 TG |
3780 | assert_return(!event_pid_changed(e), -ECHILD); |
3781 | ||
3782 | return e->epoll_fd; | |
3783 | } | |
3784 | ||
f7262a9f | 3785 | _public_ int sd_event_get_state(sd_event *e) { |
da7e457c | 3786 | assert_return(e, -EINVAL); |
b937d761 | 3787 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
3788 | assert_return(!event_pid_changed(e), -ECHILD); |
3789 | ||
3790 | return e->state; | |
3791 | } | |
3792 | ||
6203e07a | 3793 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
da7e457c | 3794 | assert_return(e, -EINVAL); |
b937d761 | 3795 | assert_return(e = event_resolve(e), -ENOPKG); |
6203e07a | 3796 | assert_return(code, -EINVAL); |
da7e457c | 3797 | assert_return(!event_pid_changed(e), -ECHILD); |
fd38203a | 3798 | |
6203e07a LP |
3799 | if (!e->exit_requested) |
3800 | return -ENODATA; | |
3801 | ||
3802 | *code = e->exit_code; | |
3803 | return 0; | |
fd38203a LP |
3804 | } |
3805 | ||
6203e07a | 3806 | _public_ int sd_event_exit(sd_event *e, int code) { |
da7e457c | 3807 | assert_return(e, -EINVAL); |
b937d761 | 3808 | assert_return(e = event_resolve(e), -ENOPKG); |
da7e457c LP |
3809 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
3810 | assert_return(!event_pid_changed(e), -ECHILD); | |
fd38203a | 3811 | |
6203e07a LP |
3812 | e->exit_requested = true; |
3813 | e->exit_code = code; | |
3814 | ||
fd38203a LP |
3815 | return 0; |
3816 | } | |
46e8c825 | 3817 | |
6a0f1f6d | 3818 | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
46e8c825 | 3819 | assert_return(e, -EINVAL); |
b937d761 | 3820 | assert_return(e = event_resolve(e), -ENOPKG); |
46e8c825 | 3821 | assert_return(usec, -EINVAL); |
46e8c825 LP |
3822 | assert_return(!event_pid_changed(e), -ECHILD); |
3823 | ||
e475d10c LP |
3824 | if (!TRIPLE_TIMESTAMP_HAS_CLOCK(clock)) |
3825 | return -EOPNOTSUPP; | |
3826 | ||
3827 | /* Generate a clean error in case CLOCK_BOOTTIME is not available. Note that don't use clock_supported() here, | |
3828 | * for a reason: there are systems where CLOCK_BOOTTIME is supported, but CLOCK_BOOTTIME_ALARM is not, but for | |
3829 | * the purpose of getting the time this doesn't matter. */ | |
3411372e LP |
3830 | if (IN_SET(clock, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM) && !clock_boottime_supported()) |
3831 | return -EOPNOTSUPP; | |
3832 | ||
e475d10c | 3833 | if (!triple_timestamp_is_set(&e->timestamp)) { |
15c689d7 | 3834 | /* Implicitly fall back to now() if we never ran before and thus have no cached time. */ |
38a03f06 LP |
3835 | *usec = now(clock); |
3836 | return 1; | |
3837 | } | |
46e8c825 | 3838 | |
e475d10c | 3839 | *usec = triple_timestamp_by_clock(&e->timestamp, clock); |
46e8c825 LP |
3840 | return 0; |
3841 | } | |
afc6adb5 LP |
3842 | |
3843 | _public_ int sd_event_default(sd_event **ret) { | |
39883f62 | 3844 | sd_event *e = NULL; |
afc6adb5 LP |
3845 | int r; |
3846 | ||
3847 | if (!ret) | |
3848 | return !!default_event; | |
3849 | ||
3850 | if (default_event) { | |
3851 | *ret = sd_event_ref(default_event); | |
3852 | return 0; | |
3853 | } | |
3854 | ||
3855 | r = sd_event_new(&e); | |
3856 | if (r < 0) | |
3857 | return r; | |
3858 | ||
3859 | e->default_event_ptr = &default_event; | |
3860 | e->tid = gettid(); | |
3861 | default_event = e; | |
3862 | ||
3863 | *ret = e; | |
3864 | return 1; | |
3865 | } | |
3866 | ||
3867 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { | |
3868 | assert_return(e, -EINVAL); | |
b937d761 | 3869 | assert_return(e = event_resolve(e), -ENOPKG); |
afc6adb5 | 3870 | assert_return(tid, -EINVAL); |
76b54375 | 3871 | assert_return(!event_pid_changed(e), -ECHILD); |
afc6adb5 | 3872 | |
76b54375 LP |
3873 | if (e->tid != 0) { |
3874 | *tid = e->tid; | |
3875 | return 0; | |
3876 | } | |
3877 | ||
3878 | return -ENXIO; | |
afc6adb5 | 3879 | } |
cde93897 LP |
3880 | |
3881 | _public_ int sd_event_set_watchdog(sd_event *e, int b) { | |
3882 | int r; | |
3883 | ||
3884 | assert_return(e, -EINVAL); | |
b937d761 | 3885 | assert_return(e = event_resolve(e), -ENOPKG); |
8f726607 | 3886 | assert_return(!event_pid_changed(e), -ECHILD); |
cde93897 LP |
3887 | |
3888 | if (e->watchdog == !!b) | |
3889 | return e->watchdog; | |
3890 | ||
3891 | if (b) { | |
09812eb7 LP |
3892 | r = sd_watchdog_enabled(false, &e->watchdog_period); |
3893 | if (r <= 0) | |
cde93897 | 3894 | return r; |
cde93897 LP |
3895 | |
3896 | /* Issue first ping immediately */ | |
3897 | sd_notify(false, "WATCHDOG=1"); | |
3898 | e->watchdog_last = now(CLOCK_MONOTONIC); | |
3899 | ||
3900 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); | |
3901 | if (e->watchdog_fd < 0) | |
3902 | return -errno; | |
3903 | ||
3904 | r = arm_watchdog(e); | |
3905 | if (r < 0) | |
3906 | goto fail; | |
3907 | ||
1eac7948 | 3908 | struct epoll_event ev = { |
a82f89aa LP |
3909 | .events = EPOLLIN, |
3910 | .data.ptr = INT_TO_PTR(SOURCE_WATCHDOG), | |
3911 | }; | |
cde93897 | 3912 | |
15c689d7 | 3913 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev) < 0) { |
cde93897 LP |
3914 | r = -errno; |
3915 | goto fail; | |
3916 | } | |
3917 | ||
3918 | } else { | |
3919 | if (e->watchdog_fd >= 0) { | |
5a795bff | 3920 | (void) epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); |
03e334a1 | 3921 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
3922 | } |
3923 | } | |
3924 | ||
3925 | e->watchdog = !!b; | |
3926 | return e->watchdog; | |
3927 | ||
3928 | fail: | |
03e334a1 | 3929 | e->watchdog_fd = safe_close(e->watchdog_fd); |
cde93897 LP |
3930 | return r; |
3931 | } | |
8f726607 LP |
3932 | |
3933 | _public_ int sd_event_get_watchdog(sd_event *e) { | |
3934 | assert_return(e, -EINVAL); | |
b937d761 | 3935 | assert_return(e = event_resolve(e), -ENOPKG); |
8f726607 LP |
3936 | assert_return(!event_pid_changed(e), -ECHILD); |
3937 | ||
3938 | return e->watchdog; | |
3939 | } | |
60a3b1e1 LP |
3940 | |
3941 | _public_ int sd_event_get_iteration(sd_event *e, uint64_t *ret) { | |
3942 | assert_return(e, -EINVAL); | |
b937d761 | 3943 | assert_return(e = event_resolve(e), -ENOPKG); |
60a3b1e1 LP |
3944 | assert_return(!event_pid_changed(e), -ECHILD); |
3945 | ||
3946 | *ret = e->iteration; | |
3947 | return 0; | |
3948 | } | |
15723a1d LP |
3949 | |
3950 | _public_ int sd_event_source_set_destroy_callback(sd_event_source *s, sd_event_destroy_t callback) { | |
3951 | assert_return(s, -EINVAL); | |
3952 | ||
3953 | s->destroy_callback = callback; | |
3954 | return 0; | |
3955 | } | |
3956 | ||
3957 | _public_ int sd_event_source_get_destroy_callback(sd_event_source *s, sd_event_destroy_t *ret) { | |
3958 | assert_return(s, -EINVAL); | |
3959 | ||
3960 | if (ret) | |
3961 | *ret = s->destroy_callback; | |
3962 | ||
3963 | return !!s->destroy_callback; | |
3964 | } | |
2382c936 YW |
3965 | |
3966 | _public_ int sd_event_source_get_floating(sd_event_source *s) { | |
3967 | assert_return(s, -EINVAL); | |
3968 | ||
3969 | return s->floating; | |
3970 | } | |
3971 | ||
3972 | _public_ int sd_event_source_set_floating(sd_event_source *s, int b) { | |
3973 | assert_return(s, -EINVAL); | |
3974 | ||
3975 | if (s->floating == !!b) | |
3976 | return 0; | |
3977 | ||
3978 | if (!s->event) /* Already disconnected */ | |
3979 | return -ESTALE; | |
3980 | ||
3981 | s->floating = b; | |
3982 | ||
3983 | if (b) { | |
3984 | sd_event_source_ref(s); | |
3985 | sd_event_unref(s->event); | |
3986 | } else { | |
3987 | sd_event_ref(s->event); | |
3988 | sd_event_source_unref(s); | |
3989 | } | |
3990 | ||
3991 | return 1; | |
3992 | } | |
b778cba4 LP |
3993 | |
3994 | _public_ int sd_event_source_get_exit_on_failure(sd_event_source *s) { | |
3995 | assert_return(s, -EINVAL); | |
3996 | assert_return(s->type != SOURCE_EXIT, -EDOM); | |
3997 | ||
3998 | return s->exit_on_failure; | |
3999 | } | |
4000 | ||
4001 | _public_ int sd_event_source_set_exit_on_failure(sd_event_source *s, int b) { | |
4002 | assert_return(s, -EINVAL); | |
4003 | assert_return(s->type != SOURCE_EXIT, -EDOM); | |
4004 | ||
4005 | if (s->exit_on_failure == !!b) | |
4006 | return 0; | |
4007 | ||
4008 | s->exit_on_failure = b; | |
4009 | return 1; | |
4010 | } |