/src/systemd/src/libsystemd/sd-event/sd-event.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2 | | |
3 | | #include <sys/epoll.h> |
4 | | #include <sys/timerfd.h> |
5 | | #include <sys/wait.h> |
6 | | |
7 | | #include "sd-daemon.h" |
8 | | #include "sd-event.h" |
9 | | #include "sd-id128.h" |
10 | | |
11 | | #include "alloc-util.h" |
12 | | #include "event-source.h" |
13 | | #include "fd-util.h" |
14 | | #include "fs-util.h" |
15 | | #include "hashmap.h" |
16 | | #include "list.h" |
17 | | #include "macro.h" |
18 | | #include "memory-util.h" |
19 | | #include "missing.h" |
20 | | #include "prioq.h" |
21 | | #include "process-util.h" |
22 | | #include "set.h" |
23 | | #include "signal-util.h" |
24 | | #include "string-table.h" |
25 | | #include "string-util.h" |
26 | | #include "time-util.h" |
27 | | |
28 | 52.0k | #define DEFAULT_ACCURACY_USEC (250 * USEC_PER_MSEC) |
29 | | |
30 | | static const char* const event_source_type_table[_SOURCE_EVENT_SOURCE_TYPE_MAX] = { |
31 | | [SOURCE_IO] = "io", |
32 | | [SOURCE_TIME_REALTIME] = "realtime", |
33 | | [SOURCE_TIME_BOOTTIME] = "bootime", |
34 | | [SOURCE_TIME_MONOTONIC] = "monotonic", |
35 | | [SOURCE_TIME_REALTIME_ALARM] = "realtime-alarm", |
36 | | [SOURCE_TIME_BOOTTIME_ALARM] = "boottime-alarm", |
37 | | [SOURCE_SIGNAL] = "signal", |
38 | | [SOURCE_CHILD] = "child", |
39 | | [SOURCE_DEFER] = "defer", |
40 | | [SOURCE_POST] = "post", |
41 | | [SOURCE_EXIT] = "exit", |
42 | | [SOURCE_WATCHDOG] = "watchdog", |
43 | | [SOURCE_INOTIFY] = "inotify", |
44 | | }; |
45 | | |
46 | | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(event_source_type, int); |
47 | | |
48 | 2.54M | #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) |
49 | | |
50 | | struct sd_event { |
51 | | unsigned n_ref; |
52 | | |
53 | | int epoll_fd; |
54 | | int watchdog_fd; |
55 | | |
56 | | Prioq *pending; |
57 | | Prioq *prepare; |
58 | | |
59 | | /* timerfd_create() only supports these five clocks so far. We |
60 | | * can add support for more clocks when the kernel learns to |
61 | | * deal with them, too. */ |
62 | | struct clock_data realtime; |
63 | | struct clock_data boottime; |
64 | | struct clock_data monotonic; |
65 | | struct clock_data realtime_alarm; |
66 | | struct clock_data boottime_alarm; |
67 | | |
68 | | usec_t perturb; |
69 | | |
70 | | sd_event_source **signal_sources; /* indexed by signal number */ |
71 | | Hashmap *signal_data; /* indexed by priority */ |
72 | | |
73 | | Hashmap *child_sources; |
74 | | unsigned n_enabled_child_sources; |
75 | | |
76 | | Set *post_sources; |
77 | | |
78 | | Prioq *exit; |
79 | | |
80 | | Hashmap *inotify_data; /* indexed by priority */ |
81 | | |
82 | | /* A list of inode structures that still have an fd open, that we need to close before the next loop iteration */ |
83 | | LIST_HEAD(struct inode_data, inode_data_to_close); |
84 | | |
85 | | /* A list of inotify objects that already have events buffered which aren't processed yet */ |
86 | | LIST_HEAD(struct inotify_data, inotify_data_buffered); |
87 | | |
88 | | pid_t original_pid; |
89 | | |
90 | | uint64_t iteration; |
91 | | triple_timestamp timestamp; |
92 | | int state; |
93 | | |
94 | | bool exit_requested:1; |
95 | | bool need_process_child:1; |
96 | | bool watchdog:1; |
97 | | bool profile_delays:1; |
98 | | |
99 | | int exit_code; |
100 | | |
101 | | pid_t tid; |
102 | | sd_event **default_event_ptr; |
103 | | |
104 | | usec_t watchdog_last, watchdog_period; |
105 | | |
106 | | unsigned n_sources; |
107 | | |
108 | | LIST_HEAD(sd_event_source, sources); |
109 | | |
110 | | usec_t last_run, last_log; |
111 | | unsigned delays[sizeof(usec_t) * 8]; |
112 | | }; |
113 | | |
114 | | static thread_local sd_event *default_event = NULL; |
115 | | |
116 | | static void source_disconnect(sd_event_source *s); |
117 | | static void event_gc_inode_data(sd_event *e, struct inode_data *d); |
118 | | |
119 | 11.5M | static sd_event *event_resolve(sd_event *e) { |
120 | 11.5M | return e == SD_EVENT_DEFAULT ? default_event : e; |
121 | 11.5M | } |
122 | | |
123 | 6.88M | static int pending_prioq_compare(const void *a, const void *b) { |
124 | 6.88M | const sd_event_source *x = a, *y = b; |
125 | 6.88M | int r; |
126 | 6.88M | |
127 | 6.88M | assert(x->pending); |
128 | 6.88M | assert(y->pending); |
129 | 6.88M | |
130 | 6.88M | /* Enabled ones first */ |
131 | 6.88M | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) |
132 | 1.92M | return -1; |
133 | 4.95M | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
134 | 709k | return 1; |
135 | 4.24M | |
136 | 4.24M | /* Lower priority values first */ |
137 | 4.24M | r = CMP(x->priority, y->priority); |
138 | 4.24M | if (r != 0) |
139 | 1.50M | return r; |
140 | 2.73M | |
141 | 2.73M | /* Older entries first */ |
142 | 2.73M | return CMP(x->pending_iteration, y->pending_iteration); |
143 | 2.73M | } |
144 | | |
145 | 2.63M | static int prepare_prioq_compare(const void *a, const void *b) { |
146 | 2.63M | const sd_event_source *x = a, *y = b; |
147 | 2.63M | int r; |
148 | 2.63M | |
149 | 2.63M | assert(x->prepare); |
150 | 2.63M | assert(y->prepare); |
151 | 2.63M | |
152 | 2.63M | /* Enabled ones first */ |
153 | 2.63M | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) |
154 | 6.56k | return -1; |
155 | 2.63M | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
156 | 0 | return 1; |
157 | 2.63M | |
158 | 2.63M | /* Move most recently prepared ones last, so that we can stop |
159 | 2.63M | * preparing as soon as we hit one that has already been |
160 | 2.63M | * prepared in the current iteration */ |
161 | 2.63M | r = CMP(x->prepare_iteration, y->prepare_iteration); |
162 | 2.63M | if (r != 0) |
163 | 1.73M | return r; |
164 | 892k | |
165 | 892k | /* Lower priority values first */ |
166 | 892k | return CMP(x->priority, y->priority); |
167 | 892k | } |
168 | | |
169 | 911k | static int earliest_time_prioq_compare(const void *a, const void *b) { |
170 | 911k | const sd_event_source *x = a, *y = b; |
171 | 911k | |
172 | 911k | assert(EVENT_SOURCE_IS_TIME(x->type)); |
173 | 911k | assert(x->type == y->type); |
174 | 911k | |
175 | 911k | /* Enabled ones first */ |
176 | 911k | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) |
177 | 8.32k | return -1; |
178 | 903k | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
179 | 3.83k | return 1; |
180 | 899k | |
181 | 899k | /* Move the pending ones to the end */ |
182 | 899k | if (!x->pending && y->pending) |
183 | 1.02k | return -1; |
184 | 898k | if (x->pending && !y->pending) |
185 | 0 | return 1; |
186 | 898k | |
187 | 898k | /* Order by time */ |
188 | 898k | return CMP(x->time.next, y->time.next); |
189 | 898k | } |
190 | | |
191 | 1.80M | static usec_t time_event_source_latest(const sd_event_source *s) { |
192 | 1.80M | return usec_add(s->time.next, s->time.accuracy); |
193 | 1.80M | } |
194 | | |
195 | 911k | static int latest_time_prioq_compare(const void *a, const void *b) { |
196 | 911k | const sd_event_source *x = a, *y = b; |
197 | 911k | |
198 | 911k | assert(EVENT_SOURCE_IS_TIME(x->type)); |
199 | 911k | assert(x->type == y->type); |
200 | 911k | |
201 | 911k | /* Enabled ones first */ |
202 | 911k | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) |
203 | 8.32k | return -1; |
204 | 903k | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
205 | 3.83k | return 1; |
206 | 899k | |
207 | 899k | /* Move the pending ones to the end */ |
208 | 899k | if (!x->pending && y->pending) |
209 | 1.02k | return -1; |
210 | 898k | if (x->pending && !y->pending) |
211 | 0 | return 1; |
212 | 898k | |
213 | 898k | /* Order by time */ |
214 | 898k | return CMP(time_event_source_latest(x), time_event_source_latest(y)); |
215 | 898k | } |
216 | | |
217 | 9.95k | static int exit_prioq_compare(const void *a, const void *b) { |
218 | 9.95k | const sd_event_source *x = a, *y = b; |
219 | 9.95k | |
220 | 9.95k | assert(x->type == SOURCE_EXIT); |
221 | 9.95k | assert(y->type == SOURCE_EXIT); |
222 | 9.95k | |
223 | 9.95k | /* Enabled ones first */ |
224 | 9.95k | if (x->enabled != SD_EVENT_OFF && y->enabled == SD_EVENT_OFF) |
225 | 6.26k | return -1; |
226 | 3.69k | if (x->enabled == SD_EVENT_OFF && y->enabled != SD_EVENT_OFF) |
227 | 0 | return 1; |
228 | 3.69k | |
229 | 3.69k | /* Lower priority values first */ |
230 | 3.69k | return CMP(x->priority, y->priority); |
231 | 3.69k | } |
232 | | |
233 | 288k | static void free_clock_data(struct clock_data *d) { |
234 | 288k | assert(d); |
235 | 288k | assert(d->wakeup == WAKEUP_CLOCK_DATA); |
236 | 288k | |
237 | 288k | safe_close(d->fd); |
238 | 288k | prioq_free(d->earliest); |
239 | 288k | prioq_free(d->latest); |
240 | 288k | } |
241 | | |
242 | 57.7k | static sd_event *event_free(sd_event *e) { |
243 | 57.7k | sd_event_source *s; |
244 | 57.7k | |
245 | 57.7k | assert(e); |
246 | 57.7k | |
247 | 77.7k | while ((s = e->sources)) { |
248 | 20.0k | assert(s->floating); |
249 | 20.0k | source_disconnect(s); |
250 | 20.0k | sd_event_source_unref(s); |
251 | 20.0k | } |
252 | 57.7k | |
253 | 57.7k | assert(e->n_sources == 0); |
254 | 57.7k | |
255 | 57.7k | if (e->default_event_ptr) |
256 | 52.6k | *(e->default_event_ptr) = NULL; |
257 | 57.7k | |
258 | 57.7k | safe_close(e->epoll_fd); |
259 | 57.7k | safe_close(e->watchdog_fd); |
260 | 57.7k | |
261 | 57.7k | free_clock_data(&e->realtime); |
262 | 57.7k | free_clock_data(&e->boottime); |
263 | 57.7k | free_clock_data(&e->monotonic); |
264 | 57.7k | free_clock_data(&e->realtime_alarm); |
265 | 57.7k | free_clock_data(&e->boottime_alarm); |
266 | 57.7k | |
267 | 57.7k | prioq_free(e->pending); |
268 | 57.7k | prioq_free(e->prepare); |
269 | 57.7k | prioq_free(e->exit); |
270 | 57.7k | |
271 | 57.7k | free(e->signal_sources); |
272 | 57.7k | hashmap_free(e->signal_data); |
273 | 57.7k | |
274 | 57.7k | hashmap_free(e->inotify_data); |
275 | 57.7k | |
276 | 57.7k | hashmap_free(e->child_sources); |
277 | 57.7k | set_free(e->post_sources); |
278 | 57.7k | |
279 | 57.7k | return mfree(e); |
280 | 57.7k | } |
281 | | |
282 | 57.7k | _public_ int sd_event_new(sd_event** ret) { |
283 | 57.7k | sd_event *e; |
284 | 57.7k | int r; |
285 | 57.7k | |
286 | 57.7k | assert_return(ret, -EINVAL); |
287 | 57.7k | |
288 | 57.7k | e = new(sd_event, 1); |
289 | 57.7k | if (!e) |
290 | 0 | return -ENOMEM; |
291 | 57.7k | |
292 | 57.7k | *e = (sd_event) { |
293 | 57.7k | .n_ref = 1, |
294 | 57.7k | .epoll_fd = -1, |
295 | 57.7k | .watchdog_fd = -1, |
296 | 57.7k | .realtime.wakeup = WAKEUP_CLOCK_DATA, |
297 | 57.7k | .realtime.fd = -1, |
298 | 57.7k | .realtime.next = USEC_INFINITY, |
299 | 57.7k | .boottime.wakeup = WAKEUP_CLOCK_DATA, |
300 | 57.7k | .boottime.fd = -1, |
301 | 57.7k | .boottime.next = USEC_INFINITY, |
302 | 57.7k | .monotonic.wakeup = WAKEUP_CLOCK_DATA, |
303 | 57.7k | .monotonic.fd = -1, |
304 | 57.7k | .monotonic.next = USEC_INFINITY, |
305 | 57.7k | .realtime_alarm.wakeup = WAKEUP_CLOCK_DATA, |
306 | 57.7k | .realtime_alarm.fd = -1, |
307 | 57.7k | .realtime_alarm.next = USEC_INFINITY, |
308 | 57.7k | .boottime_alarm.wakeup = WAKEUP_CLOCK_DATA, |
309 | 57.7k | .boottime_alarm.fd = -1, |
310 | 57.7k | .boottime_alarm.next = USEC_INFINITY, |
311 | 57.7k | .perturb = USEC_INFINITY, |
312 | 57.7k | .original_pid = getpid_cached(), |
313 | 57.7k | }; |
314 | 57.7k | |
315 | 57.7k | r = prioq_ensure_allocated(&e->pending, pending_prioq_compare); |
316 | 57.7k | if (r < 0) |
317 | 0 | goto fail; |
318 | 57.7k | |
319 | 57.7k | e->epoll_fd = epoll_create1(EPOLL_CLOEXEC); |
320 | 57.7k | if (e->epoll_fd < 0) { |
321 | 0 | r = -errno; |
322 | 0 | goto fail; |
323 | 0 | } |
324 | 57.7k | |
325 | 57.7k | e->epoll_fd = fd_move_above_stdio(e->epoll_fd); |
326 | 57.7k | |
327 | 57.7k | if (secure_getenv("SD_EVENT_PROFILE_DELAYS")) { |
328 | 0 | 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."); |
329 | 0 | e->profile_delays = true; |
330 | 0 | } |
331 | 57.7k | |
332 | 57.7k | *ret = e; |
333 | 57.7k | return 0; |
334 | 0 | |
335 | 0 | fail: |
336 | 0 | event_free(e); |
337 | 0 | return r; |
338 | 57.7k | } |
339 | | |
340 | | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_event, sd_event, event_free); |
341 | | |
342 | 59.0k | _public_ sd_event_source* sd_event_source_disable_unref(sd_event_source *s) { |
343 | 59.0k | if (s) |
344 | 29.5k | (void) sd_event_source_set_enabled(s, SD_EVENT_OFF); |
345 | 59.0k | return sd_event_source_unref(s); |
346 | 59.0k | } |
347 | | |
348 | 22.2M | static bool event_pid_changed(sd_event *e) { |
349 | 22.2M | assert(e); |
350 | 22.2M | |
351 | 22.2M | /* We don't support people creating an event loop and keeping |
352 | 22.2M | * it around over a fork(). Let's complain. */ |
353 | 22.2M | |
354 | 22.2M | return e->original_pid != getpid_cached(); |
355 | 22.2M | } |
356 | | |
357 | 120k | static void source_io_unregister(sd_event_source *s) { |
358 | 120k | int r; |
359 | 120k | |
360 | 120k | assert(s); |
361 | 120k | assert(s->type == SOURCE_IO); |
362 | 120k | |
363 | 120k | if (event_pid_changed(s->event)) |
364 | 0 | return; |
365 | 120k | |
366 | 120k | if (!s->io.registered) |
367 | 39.5k | return; |
368 | 81.0k | |
369 | 81.0k | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL); |
370 | 81.0k | if (r < 0) |
371 | 81.0k | log_debug_errno(errno, "Failed to remove source %s (type %s) from epoll: %m", |
372 | 81.0k | strna(s->description), event_source_type_to_string(s->type)); |
373 | 81.0k | |
374 | 81.0k | s->io.registered = false; |
375 | 81.0k | } |
376 | | |
377 | | static int source_io_register( |
378 | | sd_event_source *s, |
379 | | int enabled, |
380 | 943k | uint32_t events) { |
381 | 943k | |
382 | 943k | struct epoll_event ev; |
383 | 943k | int r; |
384 | 943k | |
385 | 943k | assert(s); |
386 | 943k | assert(s->type == SOURCE_IO); |
387 | 943k | assert(enabled != SD_EVENT_OFF); |
388 | 943k | |
389 | 943k | ev = (struct epoll_event) { |
390 | 943k | .events = events | (enabled == SD_EVENT_ONESHOT ? EPOLLONESHOT : 0), |
391 | 943k | .data.ptr = s, |
392 | 943k | }; |
393 | 943k | |
394 | 943k | if (s->io.registered) |
395 | 858k | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_MOD, s->io.fd, &ev); |
396 | 85.3k | else |
397 | 85.3k | r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_ADD, s->io.fd, &ev); |
398 | 943k | if (r < 0) |
399 | 4.30k | return -errno; |
400 | 939k | |
401 | 939k | s->io.registered = true; |
402 | 939k | |
403 | 939k | return 0; |
404 | 939k | } |
405 | | |
406 | 1 | static clockid_t event_source_type_to_clock(EventSourceType t) { |
407 | 1 | |
408 | 1 | switch (t) { |
409 | 1 | |
410 | 1 | case SOURCE_TIME_REALTIME: |
411 | 0 | return CLOCK_REALTIME; |
412 | 1 | |
413 | 1 | case SOURCE_TIME_BOOTTIME: |
414 | 1 | return CLOCK_BOOTTIME; |
415 | 1 | |
416 | 1 | case SOURCE_TIME_MONOTONIC: |
417 | 0 | return CLOCK_MONOTONIC; |
418 | 1 | |
419 | 1 | case SOURCE_TIME_REALTIME_ALARM: |
420 | 0 | return CLOCK_REALTIME_ALARM; |
421 | 1 | |
422 | 1 | case SOURCE_TIME_BOOTTIME_ALARM: |
423 | 0 | return CLOCK_BOOTTIME_ALARM; |
424 | 1 | |
425 | 1 | default: |
426 | 0 | return (clockid_t) -1; |
427 | 1 | } |
428 | 1 | } |
429 | | |
430 | 52.6k | static EventSourceType clock_to_event_source_type(clockid_t clock) { |
431 | 52.6k | |
432 | 52.6k | switch (clock) { |
433 | 52.6k | |
434 | 52.6k | case CLOCK_REALTIME: |
435 | 0 | return SOURCE_TIME_REALTIME; |
436 | 52.6k | |
437 | 52.6k | case CLOCK_BOOTTIME: |
438 | 5.24k | return SOURCE_TIME_BOOTTIME; |
439 | 52.6k | |
440 | 52.6k | case CLOCK_MONOTONIC: |
441 | 47.4k | return SOURCE_TIME_MONOTONIC; |
442 | 52.6k | |
443 | 52.6k | case CLOCK_REALTIME_ALARM: |
444 | 0 | return SOURCE_TIME_REALTIME_ALARM; |
445 | 52.6k | |
446 | 52.6k | case CLOCK_BOOTTIME_ALARM: |
447 | 0 | return SOURCE_TIME_BOOTTIME_ALARM; |
448 | 52.6k | |
449 | 52.6k | default: |
450 | 0 | return _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
451 | 52.6k | } |
452 | 52.6k | } |
453 | | |
454 | 1.00M | static struct clock_data* event_get_clock_data(sd_event *e, EventSourceType t) { |
455 | 1.00M | assert(e); |
456 | 1.00M | |
457 | 1.00M | switch (t) { |
458 | 1.00M | |
459 | 1.00M | case SOURCE_TIME_REALTIME: |
460 | 0 | return &e->realtime; |
461 | 1.00M | |
462 | 1.00M | case SOURCE_TIME_BOOTTIME: |
463 | 24.7k | return &e->boottime; |
464 | 1.00M | |
465 | 1.00M | case SOURCE_TIME_MONOTONIC: |
466 | 977k | return &e->monotonic; |
467 | 1.00M | |
468 | 1.00M | case SOURCE_TIME_REALTIME_ALARM: |
469 | 0 | return &e->realtime_alarm; |
470 | 1.00M | |
471 | 1.00M | case SOURCE_TIME_BOOTTIME_ALARM: |
472 | 0 | return &e->boottime_alarm; |
473 | 1.00M | |
474 | 1.00M | default: |
475 | 0 | return NULL; |
476 | 1.00M | } |
477 | 1.00M | } |
478 | | |
479 | 0 | static void event_free_signal_data(sd_event *e, struct signal_data *d) { |
480 | 0 | assert(e); |
481 | 0 |
|
482 | 0 | if (!d) |
483 | 0 | return; |
484 | 0 | |
485 | 0 | hashmap_remove(e->signal_data, &d->priority); |
486 | 0 | safe_close(d->fd); |
487 | 0 | free(d); |
488 | 0 | } |
489 | | |
490 | | static int event_make_signal_data( |
491 | | sd_event *e, |
492 | | int sig, |
493 | 0 | struct signal_data **ret) { |
494 | 0 |
|
495 | 0 | struct epoll_event ev; |
496 | 0 | struct signal_data *d; |
497 | 0 | bool added = false; |
498 | 0 | sigset_t ss_copy; |
499 | 0 | int64_t priority; |
500 | 0 | int r; |
501 | 0 |
|
502 | 0 | assert(e); |
503 | 0 |
|
504 | 0 | if (event_pid_changed(e)) |
505 | 0 | return -ECHILD; |
506 | 0 | |
507 | 0 | if (e->signal_sources && e->signal_sources[sig]) |
508 | 0 | priority = e->signal_sources[sig]->priority; |
509 | 0 | else |
510 | 0 | priority = SD_EVENT_PRIORITY_NORMAL; |
511 | 0 |
|
512 | 0 | d = hashmap_get(e->signal_data, &priority); |
513 | 0 | if (d) { |
514 | 0 | if (sigismember(&d->sigset, sig) > 0) { |
515 | 0 | if (ret) |
516 | 0 | *ret = d; |
517 | 0 | return 0; |
518 | 0 | } |
519 | 0 | } else { |
520 | 0 | r = hashmap_ensure_allocated(&e->signal_data, &uint64_hash_ops); |
521 | 0 | if (r < 0) |
522 | 0 | return r; |
523 | 0 | |
524 | 0 | d = new(struct signal_data, 1); |
525 | 0 | if (!d) |
526 | 0 | return -ENOMEM; |
527 | 0 | |
528 | 0 | *d = (struct signal_data) { |
529 | 0 | .wakeup = WAKEUP_SIGNAL_DATA, |
530 | 0 | .fd = -1, |
531 | 0 | .priority = priority, |
532 | 0 | }; |
533 | 0 |
|
534 | 0 | r = hashmap_put(e->signal_data, &d->priority, d); |
535 | 0 | if (r < 0) { |
536 | 0 | free(d); |
537 | 0 | return r; |
538 | 0 | } |
539 | 0 | |
540 | 0 | added = true; |
541 | 0 | } |
542 | 0 |
|
543 | 0 | ss_copy = d->sigset; |
544 | 0 | assert_se(sigaddset(&ss_copy, sig) >= 0); |
545 | 0 |
|
546 | 0 | r = signalfd(d->fd, &ss_copy, SFD_NONBLOCK|SFD_CLOEXEC); |
547 | 0 | if (r < 0) { |
548 | 0 | r = -errno; |
549 | 0 | goto fail; |
550 | 0 | } |
551 | 0 | |
552 | 0 | d->sigset = ss_copy; |
553 | 0 |
|
554 | 0 | if (d->fd >= 0) { |
555 | 0 | if (ret) |
556 | 0 | *ret = d; |
557 | 0 | return 0; |
558 | 0 | } |
559 | 0 |
|
560 | 0 | d->fd = fd_move_above_stdio(r); |
561 | 0 |
|
562 | 0 | ev = (struct epoll_event) { |
563 | 0 | .events = EPOLLIN, |
564 | 0 | .data.ptr = d, |
565 | 0 | }; |
566 | 0 |
|
567 | 0 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev); |
568 | 0 | if (r < 0) { |
569 | 0 | r = -errno; |
570 | 0 | goto fail; |
571 | 0 | } |
572 | 0 | |
573 | 0 | if (ret) |
574 | 0 | *ret = d; |
575 | 0 |
|
576 | 0 | return 0; |
577 | 0 |
|
578 | 0 | fail: |
579 | 0 | if (added) |
580 | 0 | event_free_signal_data(e, d); |
581 | 0 |
|
582 | 0 | return r; |
583 | 0 | } |
584 | | |
585 | 0 | static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) { |
586 | 0 | assert(e); |
587 | 0 | assert(d); |
588 | 0 |
|
589 | 0 | /* Turns off the specified signal in the signal data |
590 | 0 | * object. If the signal mask of the object becomes empty that |
591 | 0 | * way removes it. */ |
592 | 0 |
|
593 | 0 | if (sigismember(&d->sigset, sig) == 0) |
594 | 0 | return; |
595 | 0 | |
596 | 0 | assert_se(sigdelset(&d->sigset, sig) >= 0); |
597 | 0 |
|
598 | 0 | if (sigisemptyset(&d->sigset)) { |
599 | 0 | /* If all the mask is all-zero we can get rid of the structure */ |
600 | 0 | event_free_signal_data(e, d); |
601 | 0 | return; |
602 | 0 | } |
603 | 0 | |
604 | 0 | assert(d->fd >= 0); |
605 | 0 |
|
606 | 0 | if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0) |
607 | 0 | log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m"); |
608 | 0 | } |
609 | | |
610 | 0 | static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) { |
611 | 0 | struct signal_data *d; |
612 | 0 | static const int64_t zero_priority = 0; |
613 | 0 |
|
614 | 0 | assert(e); |
615 | 0 |
|
616 | 0 | /* Rechecks if the specified signal is still something we are |
617 | 0 | * interested in. If not, we'll unmask it, and possibly drop |
618 | 0 | * the signalfd for it. */ |
619 | 0 |
|
620 | 0 | if (sig == SIGCHLD && |
621 | 0 | e->n_enabled_child_sources > 0) |
622 | 0 | return; |
623 | 0 | |
624 | 0 | if (e->signal_sources && |
625 | 0 | e->signal_sources[sig] && |
626 | 0 | e->signal_sources[sig]->enabled != SD_EVENT_OFF) |
627 | 0 | return; |
628 | 0 | |
629 | 0 | /* |
630 | 0 | * The specified signal might be enabled in three different queues: |
631 | 0 | * |
632 | 0 | * 1) the one that belongs to the priority passed (if it is non-NULL) |
633 | 0 | * 2) the one that belongs to the priority of the event source of the signal (if there is one) |
634 | 0 | * 3) the 0 priority (to cover the SIGCHLD case) |
635 | 0 | * |
636 | 0 | * Hence, let's remove it from all three here. |
637 | 0 | */ |
638 | 0 | |
639 | 0 | if (priority) { |
640 | 0 | d = hashmap_get(e->signal_data, priority); |
641 | 0 | if (d) |
642 | 0 | event_unmask_signal_data(e, d, sig); |
643 | 0 | } |
644 | 0 |
|
645 | 0 | if (e->signal_sources && e->signal_sources[sig]) { |
646 | 0 | d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority); |
647 | 0 | if (d) |
648 | 0 | event_unmask_signal_data(e, d, sig); |
649 | 0 | } |
650 | 0 |
|
651 | 0 | d = hashmap_get(e->signal_data, &zero_priority); |
652 | 0 | if (d) |
653 | 0 | event_unmask_signal_data(e, d, sig); |
654 | 0 | } |
655 | | |
656 | 226k | static void source_disconnect(sd_event_source *s) { |
657 | 226k | sd_event *event; |
658 | 226k | |
659 | 226k | assert(s); |
660 | 226k | |
661 | 226k | if (!s->event) |
662 | 27.7k | return; |
663 | 198k | |
664 | 198k | assert(s->event->n_sources > 0); |
665 | 198k | |
666 | 198k | switch (s->type) { |
667 | 198k | |
668 | 198k | case SOURCE_IO: |
669 | 85.3k | if (s->io.fd >= 0) |
670 | 85.3k | source_io_unregister(s); |
671 | 85.3k | |
672 | 85.3k | break; |
673 | 198k | |
674 | 198k | case SOURCE_TIME_REALTIME: |
675 | 52.6k | case SOURCE_TIME_BOOTTIME: |
676 | 52.6k | case SOURCE_TIME_MONOTONIC: |
677 | 52.6k | case SOURCE_TIME_REALTIME_ALARM: |
678 | 52.6k | case SOURCE_TIME_BOOTTIME_ALARM: { |
679 | 52.6k | struct clock_data *d; |
680 | 52.6k | |
681 | 52.6k | d = event_get_clock_data(s->event, s->type); |
682 | 52.6k | assert(d); |
683 | 52.6k | |
684 | 52.6k | prioq_remove(d->earliest, s, &s->time.earliest_index); |
685 | 52.6k | prioq_remove(d->latest, s, &s->time.latest_index); |
686 | 52.6k | d->needs_rearm = true; |
687 | 52.6k | break; |
688 | 52.6k | } |
689 | 52.6k | |
690 | 52.6k | case SOURCE_SIGNAL: |
691 | 0 | if (s->signal.sig > 0) { |
692 | 0 |
|
693 | 0 | if (s->event->signal_sources) |
694 | 0 | s->event->signal_sources[s->signal.sig] = NULL; |
695 | 0 |
|
696 | 0 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
697 | 0 | } |
698 | 0 |
|
699 | 0 | break; |
700 | 52.6k | |
701 | 52.6k | case SOURCE_CHILD: |
702 | 0 | if (s->child.pid > 0) { |
703 | 0 | if (s->enabled != SD_EVENT_OFF) { |
704 | 0 | assert(s->event->n_enabled_child_sources > 0); |
705 | 0 | s->event->n_enabled_child_sources--; |
706 | 0 | } |
707 | 0 |
|
708 | 0 | (void) hashmap_remove(s->event->child_sources, PID_TO_PTR(s->child.pid)); |
709 | 0 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
710 | 0 | } |
711 | 0 |
|
712 | 0 | break; |
713 | 0 |
|
714 | 33.4k | case SOURCE_DEFER: |
715 | 33.4k | /* nothing */ |
716 | 33.4k | break; |
717 | 0 |
|
718 | 20.0k | case SOURCE_POST: |
719 | 20.0k | set_remove(s->event->post_sources, s); |
720 | 20.0k | break; |
721 | 0 |
|
722 | 7.38k | case SOURCE_EXIT: |
723 | 7.38k | prioq_remove(s->event->exit, s, &s->exit.prioq_index); |
724 | 7.38k | break; |
725 | 0 |
|
726 | 0 | case SOURCE_INOTIFY: { |
727 | 0 | struct inode_data *inode_data; |
728 | 0 |
|
729 | 0 | inode_data = s->inotify.inode_data; |
730 | 0 | if (inode_data) { |
731 | 0 | struct inotify_data *inotify_data; |
732 | 0 | assert_se(inotify_data = inode_data->inotify_data); |
733 | 0 |
|
734 | 0 | /* Detach this event source from the inode object */ |
735 | 0 | LIST_REMOVE(inotify.by_inode_data, inode_data->event_sources, s); |
736 | 0 | s->inotify.inode_data = NULL; |
737 | 0 |
|
738 | 0 | if (s->pending) { |
739 | 0 | assert(inotify_data->n_pending > 0); |
740 | 0 | inotify_data->n_pending--; |
741 | 0 | } |
742 | 0 |
|
743 | 0 | /* Note that we don't reduce the inotify mask for the watch descriptor here if the inode is |
744 | 0 | * continued to being watched. That's because inotify doesn't really have an API for that: we |
745 | 0 | * can only change watch masks with access to the original inode either by fd or by path. But |
746 | 0 | * paths aren't stable, and keeping an O_PATH fd open all the time would mean wasting an fd |
747 | 0 | * continuously and keeping the mount busy which we can't really do. We could reconstruct the |
748 | 0 | * original inode from /proc/self/fdinfo/$INOTIFY_FD (as all watch descriptors are listed |
749 | 0 | * there), but given the need for open_by_handle_at() which is privileged and not universally |
750 | 0 | * available this would be quite an incomplete solution. Hence we go the other way, leave the |
751 | 0 | * mask set, even if it is not minimized now, and ignore all events we aren't interested in |
752 | 0 | * anymore after reception. Yes, this sucks, but … Linux … */ |
753 | 0 |
|
754 | 0 | /* Maybe release the inode data (and its inotify) */ |
755 | 0 | event_gc_inode_data(s->event, inode_data); |
756 | 0 | } |
757 | 0 |
|
758 | 0 | break; |
759 | 0 | } |
760 | 0 |
|
761 | 0 | default: |
762 | 0 | assert_not_reached("Wut? I shouldn't exist."); |
763 | 198k | } |
764 | 198k | |
765 | 198k | if (s->pending) |
766 | 33.4k | prioq_remove(s->event->pending, s, &s->pending_index); |
767 | 198k | |
768 | 198k | if (s->prepare) |
769 | 47.4k | prioq_remove(s->event->prepare, s, &s->prepare_index); |
770 | 198k | |
771 | 198k | event = s->event; |
772 | 198k | |
773 | 198k | s->type = _SOURCE_EVENT_SOURCE_TYPE_INVALID; |
774 | 198k | s->event = NULL; |
775 | 198k | LIST_REMOVE(sources, event->sources, s); |
776 | 198k | event->n_sources--; |
777 | 198k | |
778 | 198k | if (!s->floating) |
779 | 178k | sd_event_unref(event); |
780 | 198k | } |
781 | | |
782 | 198k | static void source_free(sd_event_source *s) { |
783 | 198k | assert(s); |
784 | 198k | |
785 | 198k | source_disconnect(s); |
786 | 198k | |
787 | 198k | if (s->type == SOURCE_IO && s->io.owned) |
788 | 0 | s->io.fd = safe_close(s->io.fd); |
789 | 198k | |
790 | 198k | if (s->destroy_callback) |
791 | 0 | s->destroy_callback(s->userdata); |
792 | 198k | |
793 | 198k | free(s->description); |
794 | 198k | free(s); |
795 | 198k | } |
796 | | DEFINE_TRIVIAL_CLEANUP_FUNC(sd_event_source*, source_free); |
797 | | |
798 | 7.78M | static int source_set_pending(sd_event_source *s, bool b) { |
799 | 7.78M | int r; |
800 | 7.78M | |
801 | 7.78M | assert(s); |
802 | 7.78M | assert(s->type != SOURCE_EXIT); |
803 | 7.78M | |
804 | 7.78M | if (s->pending == b) |
805 | 5.24M | return 0; |
806 | 2.54M | |
807 | 2.54M | s->pending = b; |
808 | 2.54M | |
809 | 2.54M | if (b) { |
810 | 1.28M | s->pending_iteration = s->event->iteration; |
811 | 1.28M | |
812 | 1.28M | r = prioq_put(s->event->pending, s, &s->pending_index); |
813 | 1.28M | if (r < 0) { |
814 | 0 | s->pending = false; |
815 | 0 | return r; |
816 | 0 | } |
817 | 2.54M | } else |
818 | 2.54M | assert_se(prioq_remove(s->event->pending, s, &s->pending_index)); |
819 | 2.54M | |
820 | 2.54M | if (EVENT_SOURCE_IS_TIME(s->type)) { |
821 | 9.01k | struct clock_data *d; |
822 | 9.01k | |
823 | 9.01k | d = event_get_clock_data(s->event, s->type); |
824 | 9.01k | assert(d); |
825 | 9.01k | |
826 | 9.01k | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
827 | 9.01k | prioq_reshuffle(d->latest, s, &s->time.latest_index); |
828 | 9.01k | d->needs_rearm = true; |
829 | 9.01k | } |
830 | 2.54M | |
831 | 2.54M | if (s->type == SOURCE_SIGNAL && !b) { |
832 | 0 | struct signal_data *d; |
833 | 0 |
|
834 | 0 | d = hashmap_get(s->event->signal_data, &s->priority); |
835 | 0 | if (d && d->current == s) |
836 | 0 | d->current = NULL; |
837 | 0 | } |
838 | 2.54M | |
839 | 2.54M | if (s->type == SOURCE_INOTIFY) { |
840 | 0 |
|
841 | 0 | assert(s->inotify.inode_data); |
842 | 0 | assert(s->inotify.inode_data->inotify_data); |
843 | 0 |
|
844 | 0 | if (b) |
845 | 0 | s->inotify.inode_data->inotify_data->n_pending ++; |
846 | 0 | else { |
847 | 0 | assert(s->inotify.inode_data->inotify_data->n_pending > 0); |
848 | 0 | s->inotify.inode_data->inotify_data->n_pending --; |
849 | 0 | } |
850 | 0 | } |
851 | 2.54M | |
852 | 2.54M | return 0; |
853 | 2.54M | } |
854 | | |
855 | 198k | static sd_event_source *source_new(sd_event *e, bool floating, EventSourceType type) { |
856 | 198k | sd_event_source *s; |
857 | 198k | |
858 | 198k | assert(e); |
859 | 198k | |
860 | 198k | s = new(sd_event_source, 1); |
861 | 198k | if (!s) |
862 | 0 | return NULL; |
863 | 198k | |
864 | 198k | *s = (struct sd_event_source) { |
865 | 198k | .n_ref = 1, |
866 | 198k | .event = e, |
867 | 198k | .floating = floating, |
868 | 198k | .type = type, |
869 | 198k | .pending_index = PRIOQ_IDX_NULL, |
870 | 198k | .prepare_index = PRIOQ_IDX_NULL, |
871 | 198k | }; |
872 | 198k | |
873 | 198k | if (!floating) |
874 | 178k | sd_event_ref(e); |
875 | 198k | |
876 | 198k | LIST_PREPEND(sources, e->sources, s); |
877 | 198k | e->n_sources++; |
878 | 198k | |
879 | 198k | return s; |
880 | 198k | } |
881 | | |
882 | | _public_ int sd_event_add_io( |
883 | | sd_event *e, |
884 | | sd_event_source **ret, |
885 | | int fd, |
886 | | uint32_t events, |
887 | | sd_event_io_handler_t callback, |
888 | 85.3k | void *userdata) { |
889 | 85.3k | |
890 | 85.3k | _cleanup_(source_freep) sd_event_source *s = NULL; |
891 | 85.3k | int r; |
892 | 85.3k | |
893 | 85.3k | assert_return(e, -EINVAL); |
894 | 85.3k | assert_return(e = event_resolve(e), -ENOPKG); |
895 | 85.3k | assert_return(fd >= 0, -EBADF); |
896 | 85.3k | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
897 | 85.3k | assert_return(callback, -EINVAL); |
898 | 85.3k | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
899 | 85.3k | assert_return(!event_pid_changed(e), -ECHILD); |
900 | 85.3k | |
901 | 85.3k | s = source_new(e, !ret, SOURCE_IO); |
902 | 85.3k | if (!s) |
903 | 0 | return -ENOMEM; |
904 | 85.3k | |
905 | 85.3k | s->wakeup = WAKEUP_EVENT_SOURCE; |
906 | 85.3k | s->io.fd = fd; |
907 | 85.3k | s->io.events = events; |
908 | 85.3k | s->io.callback = callback; |
909 | 85.3k | s->userdata = userdata; |
910 | 85.3k | s->enabled = SD_EVENT_ON; |
911 | 85.3k | |
912 | 85.3k | r = source_io_register(s, s->enabled, events); |
913 | 85.3k | if (r < 0) |
914 | 4.30k | return r; |
915 | 81.0k | |
916 | 81.0k | if (ret) |
917 | 81.0k | *ret = s; |
918 | 81.0k | TAKE_PTR(s); |
919 | 81.0k | |
920 | 81.0k | return 0; |
921 | 81.0k | } |
922 | | |
923 | 0 | static void initialize_perturb(sd_event *e) { |
924 | 0 | sd_id128_t bootid = {}; |
925 | 0 |
|
926 | 0 | /* When we sleep for longer, we try to realign the wakeup to |
927 | 0 | the same time within each minute/second/250ms, so that |
928 | 0 | events all across the system can be coalesced into a single |
929 | 0 | CPU wakeup. However, let's take some system-specific |
930 | 0 | randomness for this value, so that in a network of systems |
931 | 0 | with synced clocks timer events are distributed a |
932 | 0 | bit. Here, we calculate a perturbation usec offset from the |
933 | 0 | boot ID. */ |
934 | 0 |
|
935 | 0 | if (_likely_(e->perturb != USEC_INFINITY)) |
936 | 0 | return; |
937 | 0 | |
938 | 0 | if (sd_id128_get_boot(&bootid) >= 0) |
939 | 0 | e->perturb = (bootid.qwords[0] ^ bootid.qwords[1]) % USEC_PER_MINUTE; |
940 | 0 | } |
941 | | |
942 | | static int event_setup_timer_fd( |
943 | | sd_event *e, |
944 | | struct clock_data *d, |
945 | 28.3k | clockid_t clock) { |
946 | 28.3k | |
947 | 28.3k | struct epoll_event ev; |
948 | 28.3k | int r, fd; |
949 | 28.3k | |
950 | 28.3k | assert(e); |
951 | 28.3k | assert(d); |
952 | 28.3k | |
953 | 28.3k | if (_likely_(d->fd >= 0)) |
954 | 28.3k | return 0; |
955 | 28.3k | |
956 | 28.3k | fd = timerfd_create(clock, TFD_NONBLOCK|TFD_CLOEXEC); |
957 | 28.3k | if (fd < 0) |
958 | 0 | return -errno; |
959 | 28.3k | |
960 | 28.3k | fd = fd_move_above_stdio(fd); |
961 | 28.3k | |
962 | 28.3k | ev = (struct epoll_event) { |
963 | 28.3k | .events = EPOLLIN, |
964 | 28.3k | .data.ptr = d, |
965 | 28.3k | }; |
966 | 28.3k | |
967 | 28.3k | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, fd, &ev); |
968 | 28.3k | if (r < 0) { |
969 | 0 | safe_close(fd); |
970 | 0 | return -errno; |
971 | 0 | } |
972 | 28.3k | |
973 | 28.3k | d->fd = fd; |
974 | 28.3k | return 0; |
975 | 28.3k | } |
976 | | |
977 | 0 | static int time_exit_callback(sd_event_source *s, uint64_t usec, void *userdata) { |
978 | 0 | assert(s); |
979 | 0 |
|
980 | 0 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); |
981 | 0 | } |
982 | | |
983 | | _public_ int sd_event_add_time( |
984 | | sd_event *e, |
985 | | sd_event_source **ret, |
986 | | clockid_t clock, |
987 | | uint64_t usec, |
988 | | uint64_t accuracy, |
989 | | sd_event_time_handler_t callback, |
990 | 52.6k | void *userdata) { |
991 | 52.6k | |
992 | 52.6k | EventSourceType type; |
993 | 52.6k | _cleanup_(source_freep) sd_event_source *s = NULL; |
994 | 52.6k | struct clock_data *d; |
995 | 52.6k | int r; |
996 | 52.6k | |
997 | 52.6k | assert_return(e, -EINVAL); |
998 | 52.6k | assert_return(e = event_resolve(e), -ENOPKG); |
999 | 52.6k | assert_return(accuracy != (uint64_t) -1, -EINVAL); |
1000 | 52.6k | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1001 | 52.6k | assert_return(!event_pid_changed(e), -ECHILD); |
1002 | 52.6k | |
1003 | 52.6k | if (!clock_supported(clock)) /* Checks whether the kernel supports the clock */ |
1004 | 0 | return -EOPNOTSUPP; |
1005 | 52.6k | |
1006 | 52.6k | type = clock_to_event_source_type(clock); /* checks whether sd-event supports this clock */ |
1007 | 52.6k | if (type < 0) |
1008 | 0 | return -EOPNOTSUPP; |
1009 | 52.6k | |
1010 | 52.6k | if (!callback) |
1011 | 0 | callback = time_exit_callback; |
1012 | 52.6k | |
1013 | 52.6k | d = event_get_clock_data(e, type); |
1014 | 52.6k | assert(d); |
1015 | 52.6k | |
1016 | 52.6k | r = prioq_ensure_allocated(&d->earliest, earliest_time_prioq_compare); |
1017 | 52.6k | if (r < 0) |
1018 | 0 | return r; |
1019 | 52.6k | |
1020 | 52.6k | r = prioq_ensure_allocated(&d->latest, latest_time_prioq_compare); |
1021 | 52.6k | if (r < 0) |
1022 | 0 | return r; |
1023 | 52.6k | |
1024 | 52.6k | if (d->fd < 0) { |
1025 | 28.3k | r = event_setup_timer_fd(e, d, clock); |
1026 | 28.3k | if (r < 0) |
1027 | 0 | return r; |
1028 | 52.6k | } |
1029 | 52.6k | |
1030 | 52.6k | s = source_new(e, !ret, type); |
1031 | 52.6k | if (!s) |
1032 | 0 | return -ENOMEM; |
1033 | 52.6k | |
1034 | 52.6k | s->time.next = usec; |
1035 | 52.6k | s->time.accuracy = accuracy == 0 ? DEFAULT_ACCURACY_USEC : accuracy; |
1036 | 52.6k | s->time.callback = callback; |
1037 | 52.6k | s->time.earliest_index = s->time.latest_index = PRIOQ_IDX_NULL; |
1038 | 52.6k | s->userdata = userdata; |
1039 | 52.6k | s->enabled = SD_EVENT_ONESHOT; |
1040 | 52.6k | |
1041 | 52.6k | d->needs_rearm = true; |
1042 | 52.6k | |
1043 | 52.6k | r = prioq_put(d->earliest, s, &s->time.earliest_index); |
1044 | 52.6k | if (r < 0) |
1045 | 0 | return r; |
1046 | 52.6k | |
1047 | 52.6k | r = prioq_put(d->latest, s, &s->time.latest_index); |
1048 | 52.6k | if (r < 0) |
1049 | 0 | return r; |
1050 | 52.6k | |
1051 | 52.6k | if (ret) |
1052 | 52.6k | *ret = s; |
1053 | 52.6k | TAKE_PTR(s); |
1054 | 52.6k | |
1055 | 52.6k | return 0; |
1056 | 52.6k | } |
1057 | | |
1058 | 0 | static int signal_exit_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1059 | 0 | assert(s); |
1060 | 0 |
|
1061 | 0 | return sd_event_exit(sd_event_source_get_event(s), PTR_TO_INT(userdata)); |
1062 | 0 | } |
1063 | | |
1064 | | _public_ int sd_event_add_signal( |
1065 | | sd_event *e, |
1066 | | sd_event_source **ret, |
1067 | | int sig, |
1068 | | sd_event_signal_handler_t callback, |
1069 | 40.0k | void *userdata) { |
1070 | 40.0k | |
1071 | 40.0k | _cleanup_(source_freep) sd_event_source *s = NULL; |
1072 | 40.0k | struct signal_data *d; |
1073 | 40.0k | sigset_t ss; |
1074 | 40.0k | int r; |
1075 | 40.0k | |
1076 | 40.0k | assert_return(e, -EINVAL); |
1077 | 40.0k | assert_return(e = event_resolve(e), -ENOPKG); |
1078 | 40.0k | assert_return(SIGNAL_VALID(sig), -EINVAL); |
1079 | 40.0k | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1080 | 40.0k | assert_return(!event_pid_changed(e), -ECHILD); |
1081 | 40.0k | |
1082 | 40.0k | if (!callback) |
1083 | 40.0k | callback = signal_exit_callback; |
1084 | 40.0k | |
1085 | 40.0k | r = pthread_sigmask(SIG_SETMASK, NULL, &ss); |
1086 | 40.0k | if (r != 0) |
1087 | 0 | return -r; |
1088 | 40.0k | |
1089 | 40.0k | if (!sigismember(&ss, sig)) |
1090 | 40.0k | return -EBUSY; |
1091 | 0 | |
1092 | 0 | if (!e->signal_sources) { |
1093 | 0 | e->signal_sources = new0(sd_event_source*, _NSIG); |
1094 | 0 | if (!e->signal_sources) |
1095 | 0 | return -ENOMEM; |
1096 | 0 | } else if (e->signal_sources[sig]) |
1097 | 0 | return -EBUSY; |
1098 | 0 | |
1099 | 0 | s = source_new(e, !ret, SOURCE_SIGNAL); |
1100 | 0 | if (!s) |
1101 | 0 | return -ENOMEM; |
1102 | 0 | |
1103 | 0 | s->signal.sig = sig; |
1104 | 0 | s->signal.callback = callback; |
1105 | 0 | s->userdata = userdata; |
1106 | 0 | s->enabled = SD_EVENT_ON; |
1107 | 0 |
|
1108 | 0 | e->signal_sources[sig] = s; |
1109 | 0 |
|
1110 | 0 | r = event_make_signal_data(e, sig, &d); |
1111 | 0 | if (r < 0) |
1112 | 0 | return r; |
1113 | 0 | |
1114 | 0 | /* Use the signal name as description for the event source by default */ |
1115 | 0 | (void) sd_event_source_set_description(s, signal_to_string(sig)); |
1116 | 0 |
|
1117 | 0 | if (ret) |
1118 | 0 | *ret = s; |
1119 | 0 | TAKE_PTR(s); |
1120 | 0 |
|
1121 | 0 | return 0; |
1122 | 0 | } |
1123 | | |
1124 | | _public_ int sd_event_add_child( |
1125 | | sd_event *e, |
1126 | | sd_event_source **ret, |
1127 | | pid_t pid, |
1128 | | int options, |
1129 | | sd_event_child_handler_t callback, |
1130 | 0 | void *userdata) { |
1131 | 0 |
|
1132 | 0 | _cleanup_(source_freep) sd_event_source *s = NULL; |
1133 | 0 | int r; |
1134 | 0 |
|
1135 | 0 | assert_return(e, -EINVAL); |
1136 | 0 | assert_return(e = event_resolve(e), -ENOPKG); |
1137 | 0 | assert_return(pid > 1, -EINVAL); |
1138 | 0 | assert_return(!(options & ~(WEXITED|WSTOPPED|WCONTINUED)), -EINVAL); |
1139 | 0 | assert_return(options != 0, -EINVAL); |
1140 | 0 | assert_return(callback, -EINVAL); |
1141 | 0 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1142 | 0 | assert_return(!event_pid_changed(e), -ECHILD); |
1143 | 0 |
|
1144 | 0 | r = hashmap_ensure_allocated(&e->child_sources, NULL); |
1145 | 0 | if (r < 0) |
1146 | 0 | return r; |
1147 | 0 | |
1148 | 0 | if (hashmap_contains(e->child_sources, PID_TO_PTR(pid))) |
1149 | 0 | return -EBUSY; |
1150 | 0 | |
1151 | 0 | s = source_new(e, !ret, SOURCE_CHILD); |
1152 | 0 | if (!s) |
1153 | 0 | return -ENOMEM; |
1154 | 0 | |
1155 | 0 | s->child.pid = pid; |
1156 | 0 | s->child.options = options; |
1157 | 0 | s->child.callback = callback; |
1158 | 0 | s->userdata = userdata; |
1159 | 0 | s->enabled = SD_EVENT_ONESHOT; |
1160 | 0 |
|
1161 | 0 | r = hashmap_put(e->child_sources, PID_TO_PTR(pid), s); |
1162 | 0 | if (r < 0) |
1163 | 0 | return r; |
1164 | 0 | |
1165 | 0 | e->n_enabled_child_sources++; |
1166 | 0 |
|
1167 | 0 | r = event_make_signal_data(e, SIGCHLD, NULL); |
1168 | 0 | if (r < 0) { |
1169 | 0 | e->n_enabled_child_sources--; |
1170 | 0 | return r; |
1171 | 0 | } |
1172 | 0 | |
1173 | 0 | e->need_process_child = true; |
1174 | 0 |
|
1175 | 0 | if (ret) |
1176 | 0 | *ret = s; |
1177 | 0 | TAKE_PTR(s); |
1178 | 0 |
|
1179 | 0 | return 0; |
1180 | 0 | } |
1181 | | |
1182 | | _public_ int sd_event_add_defer( |
1183 | | sd_event *e, |
1184 | | sd_event_source **ret, |
1185 | | sd_event_handler_t callback, |
1186 | 33.4k | void *userdata) { |
1187 | 33.4k | |
1188 | 33.4k | _cleanup_(source_freep) sd_event_source *s = NULL; |
1189 | 33.4k | int r; |
1190 | 33.4k | |
1191 | 33.4k | assert_return(e, -EINVAL); |
1192 | 33.4k | assert_return(e = event_resolve(e), -ENOPKG); |
1193 | 33.4k | assert_return(callback, -EINVAL); |
1194 | 33.4k | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1195 | 33.4k | assert_return(!event_pid_changed(e), -ECHILD); |
1196 | 33.4k | |
1197 | 33.4k | s = source_new(e, !ret, SOURCE_DEFER); |
1198 | 33.4k | if (!s) |
1199 | 0 | return -ENOMEM; |
1200 | 33.4k | |
1201 | 33.4k | s->defer.callback = callback; |
1202 | 33.4k | s->userdata = userdata; |
1203 | 33.4k | s->enabled = SD_EVENT_ONESHOT; |
1204 | 33.4k | |
1205 | 33.4k | r = source_set_pending(s, true); |
1206 | 33.4k | if (r < 0) |
1207 | 0 | return r; |
1208 | 33.4k | |
1209 | 33.4k | if (ret) |
1210 | 33.4k | *ret = s; |
1211 | 33.4k | TAKE_PTR(s); |
1212 | 33.4k | |
1213 | 33.4k | return 0; |
1214 | 33.4k | } |
1215 | | |
1216 | | _public_ int sd_event_add_post( |
1217 | | sd_event *e, |
1218 | | sd_event_source **ret, |
1219 | | sd_event_handler_t callback, |
1220 | 20.0k | void *userdata) { |
1221 | 20.0k | |
1222 | 20.0k | _cleanup_(source_freep) sd_event_source *s = NULL; |
1223 | 20.0k | int r; |
1224 | 20.0k | |
1225 | 20.0k | assert_return(e, -EINVAL); |
1226 | 20.0k | assert_return(e = event_resolve(e), -ENOPKG); |
1227 | 20.0k | assert_return(callback, -EINVAL); |
1228 | 20.0k | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1229 | 20.0k | assert_return(!event_pid_changed(e), -ECHILD); |
1230 | 20.0k | |
1231 | 20.0k | r = set_ensure_allocated(&e->post_sources, NULL); |
1232 | 20.0k | if (r < 0) |
1233 | 0 | return r; |
1234 | 20.0k | |
1235 | 20.0k | s = source_new(e, !ret, SOURCE_POST); |
1236 | 20.0k | if (!s) |
1237 | 0 | return -ENOMEM; |
1238 | 20.0k | |
1239 | 20.0k | s->post.callback = callback; |
1240 | 20.0k | s->userdata = userdata; |
1241 | 20.0k | s->enabled = SD_EVENT_ON; |
1242 | 20.0k | |
1243 | 20.0k | r = set_put(e->post_sources, s); |
1244 | 20.0k | if (r < 0) |
1245 | 0 | return r; |
1246 | 20.0k | |
1247 | 20.0k | if (ret) |
1248 | 0 | *ret = s; |
1249 | 20.0k | TAKE_PTR(s); |
1250 | 20.0k | |
1251 | 20.0k | return 0; |
1252 | 20.0k | } |
1253 | | |
1254 | | _public_ int sd_event_add_exit( |
1255 | | sd_event *e, |
1256 | | sd_event_source **ret, |
1257 | | sd_event_handler_t callback, |
1258 | 7.38k | void *userdata) { |
1259 | 7.38k | |
1260 | 7.38k | _cleanup_(source_freep) sd_event_source *s = NULL; |
1261 | 7.38k | int r; |
1262 | 7.38k | |
1263 | 7.38k | assert_return(e, -EINVAL); |
1264 | 7.38k | assert_return(e = event_resolve(e), -ENOPKG); |
1265 | 7.38k | assert_return(callback, -EINVAL); |
1266 | 7.38k | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1267 | 7.38k | assert_return(!event_pid_changed(e), -ECHILD); |
1268 | 7.38k | |
1269 | 7.38k | r = prioq_ensure_allocated(&e->exit, exit_prioq_compare); |
1270 | 7.38k | if (r < 0) |
1271 | 0 | return r; |
1272 | 7.38k | |
1273 | 7.38k | s = source_new(e, !ret, SOURCE_EXIT); |
1274 | 7.38k | if (!s) |
1275 | 0 | return -ENOMEM; |
1276 | 7.38k | |
1277 | 7.38k | s->exit.callback = callback; |
1278 | 7.38k | s->userdata = userdata; |
1279 | 7.38k | s->exit.prioq_index = PRIOQ_IDX_NULL; |
1280 | 7.38k | s->enabled = SD_EVENT_ONESHOT; |
1281 | 7.38k | |
1282 | 7.38k | r = prioq_put(s->event->exit, s, &s->exit.prioq_index); |
1283 | 7.38k | if (r < 0) |
1284 | 0 | return r; |
1285 | 7.38k | |
1286 | 7.38k | if (ret) |
1287 | 7.38k | *ret = s; |
1288 | 7.38k | TAKE_PTR(s); |
1289 | 7.38k | |
1290 | 7.38k | return 0; |
1291 | 7.38k | } |
1292 | | |
1293 | 0 | static void event_free_inotify_data(sd_event *e, struct inotify_data *d) { |
1294 | 0 | assert(e); |
1295 | 0 |
|
1296 | 0 | if (!d) |
1297 | 0 | return; |
1298 | 0 | |
1299 | 0 | assert(hashmap_isempty(d->inodes)); |
1300 | 0 | assert(hashmap_isempty(d->wd)); |
1301 | 0 |
|
1302 | 0 | if (d->buffer_filled > 0) |
1303 | 0 | LIST_REMOVE(buffered, e->inotify_data_buffered, d); |
1304 | 0 |
|
1305 | 0 | hashmap_free(d->inodes); |
1306 | 0 | hashmap_free(d->wd); |
1307 | 0 |
|
1308 | 0 | assert_se(hashmap_remove(e->inotify_data, &d->priority) == d); |
1309 | 0 |
|
1310 | 0 | if (d->fd >= 0) { |
1311 | 0 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, d->fd, NULL) < 0) |
1312 | 0 | log_debug_errno(errno, "Failed to remove inotify fd from epoll, ignoring: %m"); |
1313 | 0 |
|
1314 | 0 | safe_close(d->fd); |
1315 | 0 | } |
1316 | 0 | free(d); |
1317 | 0 | } |
1318 | | |
1319 | | static int event_make_inotify_data( |
1320 | | sd_event *e, |
1321 | | int64_t priority, |
1322 | 0 | struct inotify_data **ret) { |
1323 | 0 |
|
1324 | 0 | _cleanup_close_ int fd = -1; |
1325 | 0 | struct inotify_data *d; |
1326 | 0 | struct epoll_event ev; |
1327 | 0 | int r; |
1328 | 0 |
|
1329 | 0 | assert(e); |
1330 | 0 |
|
1331 | 0 | d = hashmap_get(e->inotify_data, &priority); |
1332 | 0 | if (d) { |
1333 | 0 | if (ret) |
1334 | 0 | *ret = d; |
1335 | 0 | return 0; |
1336 | 0 | } |
1337 | 0 |
|
1338 | 0 | fd = inotify_init1(IN_NONBLOCK|O_CLOEXEC); |
1339 | 0 | if (fd < 0) |
1340 | 0 | return -errno; |
1341 | 0 | |
1342 | 0 | fd = fd_move_above_stdio(fd); |
1343 | 0 |
|
1344 | 0 | r = hashmap_ensure_allocated(&e->inotify_data, &uint64_hash_ops); |
1345 | 0 | if (r < 0) |
1346 | 0 | return r; |
1347 | 0 | |
1348 | 0 | d = new(struct inotify_data, 1); |
1349 | 0 | if (!d) |
1350 | 0 | return -ENOMEM; |
1351 | 0 | |
1352 | 0 | *d = (struct inotify_data) { |
1353 | 0 | .wakeup = WAKEUP_INOTIFY_DATA, |
1354 | 0 | .fd = TAKE_FD(fd), |
1355 | 0 | .priority = priority, |
1356 | 0 | }; |
1357 | 0 |
|
1358 | 0 | r = hashmap_put(e->inotify_data, &d->priority, d); |
1359 | 0 | if (r < 0) { |
1360 | 0 | d->fd = safe_close(d->fd); |
1361 | 0 | free(d); |
1362 | 0 | return r; |
1363 | 0 | } |
1364 | 0 | |
1365 | 0 | ev = (struct epoll_event) { |
1366 | 0 | .events = EPOLLIN, |
1367 | 0 | .data.ptr = d, |
1368 | 0 | }; |
1369 | 0 |
|
1370 | 0 | if (epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, d->fd, &ev) < 0) { |
1371 | 0 | r = -errno; |
1372 | 0 | d->fd = safe_close(d->fd); /* let's close this ourselves, as event_free_inotify_data() would otherwise |
1373 | 0 | * remove the fd from the epoll first, which we don't want as we couldn't |
1374 | 0 | * add it in the first place. */ |
1375 | 0 | event_free_inotify_data(e, d); |
1376 | 0 | return r; |
1377 | 0 | } |
1378 | 0 | |
1379 | 0 | if (ret) |
1380 | 0 | *ret = d; |
1381 | 0 |
|
1382 | 0 | return 1; |
1383 | 0 | } |
1384 | | |
1385 | 0 | static int inode_data_compare(const struct inode_data *x, const struct inode_data *y) { |
1386 | 0 | int r; |
1387 | 0 |
|
1388 | 0 | assert(x); |
1389 | 0 | assert(y); |
1390 | 0 |
|
1391 | 0 | r = CMP(x->dev, y->dev); |
1392 | 0 | if (r != 0) |
1393 | 0 | return r; |
1394 | 0 | |
1395 | 0 | return CMP(x->ino, y->ino); |
1396 | 0 | } |
1397 | | |
1398 | 0 | static void inode_data_hash_func(const struct inode_data *d, struct siphash *state) { |
1399 | 0 | assert(d); |
1400 | 0 |
|
1401 | 0 | siphash24_compress(&d->dev, sizeof(d->dev), state); |
1402 | 0 | siphash24_compress(&d->ino, sizeof(d->ino), state); |
1403 | 0 | } |
1404 | | |
1405 | | DEFINE_PRIVATE_HASH_OPS(inode_data_hash_ops, struct inode_data, inode_data_hash_func, inode_data_compare); |
1406 | | |
1407 | | static void event_free_inode_data( |
1408 | | sd_event *e, |
1409 | 0 | struct inode_data *d) { |
1410 | 0 |
|
1411 | 0 | assert(e); |
1412 | 0 |
|
1413 | 0 | if (!d) |
1414 | 0 | return; |
1415 | 0 | |
1416 | 0 | assert(!d->event_sources); |
1417 | 0 |
|
1418 | 0 | if (d->fd >= 0) { |
1419 | 0 | LIST_REMOVE(to_close, e->inode_data_to_close, d); |
1420 | 0 | safe_close(d->fd); |
1421 | 0 | } |
1422 | 0 |
|
1423 | 0 | if (d->inotify_data) { |
1424 | 0 |
|
1425 | 0 | if (d->wd >= 0) { |
1426 | 0 | if (d->inotify_data->fd >= 0) { |
1427 | 0 | /* So here's a problem. At the time this runs the watch descriptor might already be |
1428 | 0 | * invalidated, because an IN_IGNORED event might be queued right the moment we enter |
1429 | 0 | * the syscall. Hence, whenever we get EINVAL, ignore it entirely, since it's a very |
1430 | 0 | * likely case to happen. */ |
1431 | 0 |
|
1432 | 0 | if (inotify_rm_watch(d->inotify_data->fd, d->wd) < 0 && errno != EINVAL) |
1433 | 0 | log_debug_errno(errno, "Failed to remove watch descriptor %i from inotify, ignoring: %m", d->wd); |
1434 | 0 | } |
1435 | 0 |
|
1436 | 0 | assert_se(hashmap_remove(d->inotify_data->wd, INT_TO_PTR(d->wd)) == d); |
1437 | 0 | } |
1438 | 0 |
|
1439 | 0 | assert_se(hashmap_remove(d->inotify_data->inodes, d) == d); |
1440 | 0 | } |
1441 | 0 |
|
1442 | 0 | free(d); |
1443 | 0 | } |
1444 | | |
1445 | | static void event_gc_inode_data( |
1446 | | sd_event *e, |
1447 | 0 | struct inode_data *d) { |
1448 | 0 |
|
1449 | 0 | struct inotify_data *inotify_data; |
1450 | 0 |
|
1451 | 0 | assert(e); |
1452 | 0 |
|
1453 | 0 | if (!d) |
1454 | 0 | return; |
1455 | 0 | |
1456 | 0 | if (d->event_sources) |
1457 | 0 | return; |
1458 | 0 | |
1459 | 0 | inotify_data = d->inotify_data; |
1460 | 0 | event_free_inode_data(e, d); |
1461 | 0 |
|
1462 | 0 | if (inotify_data && hashmap_isempty(inotify_data->inodes)) |
1463 | 0 | event_free_inotify_data(e, inotify_data); |
1464 | 0 | } |
1465 | | |
1466 | | static int event_make_inode_data( |
1467 | | sd_event *e, |
1468 | | struct inotify_data *inotify_data, |
1469 | | dev_t dev, |
1470 | | ino_t ino, |
1471 | 0 | struct inode_data **ret) { |
1472 | 0 |
|
1473 | 0 | struct inode_data *d, key; |
1474 | 0 | int r; |
1475 | 0 |
|
1476 | 0 | assert(e); |
1477 | 0 | assert(inotify_data); |
1478 | 0 |
|
1479 | 0 | key = (struct inode_data) { |
1480 | 0 | .ino = ino, |
1481 | 0 | .dev = dev, |
1482 | 0 | }; |
1483 | 0 |
|
1484 | 0 | d = hashmap_get(inotify_data->inodes, &key); |
1485 | 0 | if (d) { |
1486 | 0 | if (ret) |
1487 | 0 | *ret = d; |
1488 | 0 |
|
1489 | 0 | return 0; |
1490 | 0 | } |
1491 | 0 |
|
1492 | 0 | r = hashmap_ensure_allocated(&inotify_data->inodes, &inode_data_hash_ops); |
1493 | 0 | if (r < 0) |
1494 | 0 | return r; |
1495 | 0 | |
1496 | 0 | d = new(struct inode_data, 1); |
1497 | 0 | if (!d) |
1498 | 0 | return -ENOMEM; |
1499 | 0 | |
1500 | 0 | *d = (struct inode_data) { |
1501 | 0 | .dev = dev, |
1502 | 0 | .ino = ino, |
1503 | 0 | .wd = -1, |
1504 | 0 | .fd = -1, |
1505 | 0 | .inotify_data = inotify_data, |
1506 | 0 | }; |
1507 | 0 |
|
1508 | 0 | r = hashmap_put(inotify_data->inodes, d, d); |
1509 | 0 | if (r < 0) { |
1510 | 0 | free(d); |
1511 | 0 | return r; |
1512 | 0 | } |
1513 | 0 | |
1514 | 0 | if (ret) |
1515 | 0 | *ret = d; |
1516 | 0 |
|
1517 | 0 | return 1; |
1518 | 0 | } |
1519 | | |
1520 | 0 | static uint32_t inode_data_determine_mask(struct inode_data *d) { |
1521 | 0 | bool excl_unlink = true; |
1522 | 0 | uint32_t combined = 0; |
1523 | 0 | sd_event_source *s; |
1524 | 0 |
|
1525 | 0 | assert(d); |
1526 | 0 |
|
1527 | 0 | /* Combines the watch masks of all event sources watching this inode. We generally just OR them together, but |
1528 | 0 | * the IN_EXCL_UNLINK flag is ANDed instead. |
1529 | 0 | * |
1530 | 0 | * Note that we add all sources to the mask here, regardless whether enabled, disabled or oneshot. That's |
1531 | 0 | * because we cannot change the mask anymore after the event source was created once, since the kernel has no |
1532 | 0 | * API for that. Hence we need to subscribe to the maximum mask we ever might be interested in, and suppress |
1533 | 0 | * events we don't care for client-side. */ |
1534 | 0 |
|
1535 | 0 | LIST_FOREACH(inotify.by_inode_data, s, d->event_sources) { |
1536 | 0 |
|
1537 | 0 | if ((s->inotify.mask & IN_EXCL_UNLINK) == 0) |
1538 | 0 | excl_unlink = false; |
1539 | 0 |
|
1540 | 0 | combined |= s->inotify.mask; |
1541 | 0 | } |
1542 | 0 |
|
1543 | 0 | return (combined & ~(IN_ONESHOT|IN_DONT_FOLLOW|IN_ONLYDIR|IN_EXCL_UNLINK)) | (excl_unlink ? IN_EXCL_UNLINK : 0); |
1544 | 0 | } |
1545 | | |
1546 | 0 | static int inode_data_realize_watch(sd_event *e, struct inode_data *d) { |
1547 | 0 | uint32_t combined_mask; |
1548 | 0 | int wd, r; |
1549 | 0 |
|
1550 | 0 | assert(d); |
1551 | 0 | assert(d->fd >= 0); |
1552 | 0 |
|
1553 | 0 | combined_mask = inode_data_determine_mask(d); |
1554 | 0 |
|
1555 | 0 | if (d->wd >= 0 && combined_mask == d->combined_mask) |
1556 | 0 | return 0; |
1557 | 0 | |
1558 | 0 | r = hashmap_ensure_allocated(&d->inotify_data->wd, NULL); |
1559 | 0 | if (r < 0) |
1560 | 0 | return r; |
1561 | 0 | |
1562 | 0 | wd = inotify_add_watch_fd(d->inotify_data->fd, d->fd, combined_mask); |
1563 | 0 | if (wd < 0) |
1564 | 0 | return -errno; |
1565 | 0 | |
1566 | 0 | if (d->wd < 0) { |
1567 | 0 | r = hashmap_put(d->inotify_data->wd, INT_TO_PTR(wd), d); |
1568 | 0 | if (r < 0) { |
1569 | 0 | (void) inotify_rm_watch(d->inotify_data->fd, wd); |
1570 | 0 | return r; |
1571 | 0 | } |
1572 | 0 | |
1573 | 0 | d->wd = wd; |
1574 | 0 |
|
1575 | 0 | } else if (d->wd != wd) { |
1576 | 0 |
|
1577 | 0 | log_debug("Weird, the watch descriptor we already knew for this inode changed?"); |
1578 | 0 | (void) inotify_rm_watch(d->fd, wd); |
1579 | 0 | return -EINVAL; |
1580 | 0 | } |
1581 | 0 |
|
1582 | 0 | d->combined_mask = combined_mask; |
1583 | 0 | return 1; |
1584 | 0 | } |
1585 | | |
1586 | | _public_ int sd_event_add_inotify( |
1587 | | sd_event *e, |
1588 | | sd_event_source **ret, |
1589 | | const char *path, |
1590 | | uint32_t mask, |
1591 | | sd_event_inotify_handler_t callback, |
1592 | 0 | void *userdata) { |
1593 | 0 |
|
1594 | 0 | struct inotify_data *inotify_data = NULL; |
1595 | 0 | struct inode_data *inode_data = NULL; |
1596 | 0 | _cleanup_close_ int fd = -1; |
1597 | 0 | _cleanup_(source_freep) sd_event_source *s = NULL; |
1598 | 0 | struct stat st; |
1599 | 0 | int r; |
1600 | 0 |
|
1601 | 0 | assert_return(e, -EINVAL); |
1602 | 0 | assert_return(e = event_resolve(e), -ENOPKG); |
1603 | 0 | assert_return(path, -EINVAL); |
1604 | 0 | assert_return(callback, -EINVAL); |
1605 | 0 | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
1606 | 0 | assert_return(!event_pid_changed(e), -ECHILD); |
1607 | 0 |
|
1608 | 0 | /* Refuse IN_MASK_ADD since we coalesce watches on the same inode, and hence really don't want to merge |
1609 | 0 | * masks. Or in other words, this whole code exists only to manage IN_MASK_ADD type operations for you, hence |
1610 | 0 | * the user can't use them for us. */ |
1611 | 0 | if (mask & IN_MASK_ADD) |
1612 | 0 | return -EINVAL; |
1613 | 0 | |
1614 | 0 | fd = open(path, O_PATH|O_CLOEXEC| |
1615 | 0 | (mask & IN_ONLYDIR ? O_DIRECTORY : 0)| |
1616 | 0 | (mask & IN_DONT_FOLLOW ? O_NOFOLLOW : 0)); |
1617 | 0 | if (fd < 0) |
1618 | 0 | return -errno; |
1619 | 0 | |
1620 | 0 | if (fstat(fd, &st) < 0) |
1621 | 0 | return -errno; |
1622 | 0 | |
1623 | 0 | s = source_new(e, !ret, SOURCE_INOTIFY); |
1624 | 0 | if (!s) |
1625 | 0 | return -ENOMEM; |
1626 | 0 | |
1627 | 0 | s->enabled = mask & IN_ONESHOT ? SD_EVENT_ONESHOT : SD_EVENT_ON; |
1628 | 0 | s->inotify.mask = mask; |
1629 | 0 | s->inotify.callback = callback; |
1630 | 0 | s->userdata = userdata; |
1631 | 0 |
|
1632 | 0 | /* Allocate an inotify object for this priority, and an inode object within it */ |
1633 | 0 | r = event_make_inotify_data(e, SD_EVENT_PRIORITY_NORMAL, &inotify_data); |
1634 | 0 | if (r < 0) |
1635 | 0 | return r; |
1636 | 0 | |
1637 | 0 | r = event_make_inode_data(e, inotify_data, st.st_dev, st.st_ino, &inode_data); |
1638 | 0 | if (r < 0) { |
1639 | 0 | event_free_inotify_data(e, inotify_data); |
1640 | 0 | return r; |
1641 | 0 | } |
1642 | 0 | |
1643 | 0 | /* Keep the O_PATH fd around until the first iteration of the loop, so that we can still change the priority of |
1644 | 0 | * the event source, until then, for which we need the original inode. */ |
1645 | 0 | if (inode_data->fd < 0) { |
1646 | 0 | inode_data->fd = TAKE_FD(fd); |
1647 | 0 | LIST_PREPEND(to_close, e->inode_data_to_close, inode_data); |
1648 | 0 | } |
1649 | 0 |
|
1650 | 0 | /* Link our event source to the inode data object */ |
1651 | 0 | LIST_PREPEND(inotify.by_inode_data, inode_data->event_sources, s); |
1652 | 0 | s->inotify.inode_data = inode_data; |
1653 | 0 |
|
1654 | 0 | /* Actually realize the watch now */ |
1655 | 0 | r = inode_data_realize_watch(e, inode_data); |
1656 | 0 | if (r < 0) |
1657 | 0 | return r; |
1658 | 0 | |
1659 | 0 | (void) sd_event_source_set_description(s, path); |
1660 | 0 |
|
1661 | 0 | if (ret) |
1662 | 0 | *ret = s; |
1663 | 0 | TAKE_PTR(s); |
1664 | 0 |
|
1665 | 0 | return 0; |
1666 | 0 | } |
1667 | | |
1668 | 194k | static sd_event_source* event_source_free(sd_event_source *s) { |
1669 | 194k | if (!s) |
1670 | 0 | return NULL; |
1671 | 194k | |
1672 | 194k | /* Here's a special hack: when we are called from a |
1673 | 194k | * dispatch handler we won't free the event source |
1674 | 194k | * immediately, but we will detach the fd from the |
1675 | 194k | * epoll. This way it is safe for the caller to unref |
1676 | 194k | * the event source and immediately close the fd, but |
1677 | 194k | * we still retain a valid event source object after |
1678 | 194k | * the callback. */ |
1679 | 194k | |
1680 | 194k | if (s->dispatching) { |
1681 | 7.72k | if (s->type == SOURCE_IO) |
1682 | 342 | source_io_unregister(s); |
1683 | 7.72k | |
1684 | 7.72k | source_disconnect(s); |
1685 | 7.72k | } else |
1686 | 186k | source_free(s); |
1687 | 194k | |
1688 | 194k | return NULL; |
1689 | 194k | } |
1690 | | |
1691 | | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_event_source, sd_event_source, event_source_free); |
1692 | | |
1693 | 142k | _public_ int sd_event_source_set_description(sd_event_source *s, const char *description) { |
1694 | 142k | assert_return(s, -EINVAL); |
1695 | 142k | assert_return(!event_pid_changed(s->event), -ECHILD); |
1696 | 142k | |
1697 | 142k | return free_and_strdup(&s->description, description); |
1698 | 142k | } |
1699 | | |
1700 | 0 | _public_ int sd_event_source_get_description(sd_event_source *s, const char **description) { |
1701 | 0 | assert_return(s, -EINVAL); |
1702 | 0 | assert_return(description, -EINVAL); |
1703 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1704 | 0 |
|
1705 | 0 | if (!s->description) |
1706 | 0 | return -ENXIO; |
1707 | 0 | |
1708 | 0 | *description = s->description; |
1709 | 0 | return 0; |
1710 | 0 | } |
1711 | | |
1712 | 3.69k | _public_ sd_event *sd_event_source_get_event(sd_event_source *s) { |
1713 | 3.69k | assert_return(s, NULL); |
1714 | 3.69k | |
1715 | 3.69k | return s->event; |
1716 | 3.69k | } |
1717 | | |
1718 | 0 | _public_ int sd_event_source_get_pending(sd_event_source *s) { |
1719 | 0 | assert_return(s, -EINVAL); |
1720 | 0 | assert_return(s->type != SOURCE_EXIT, -EDOM); |
1721 | 0 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1722 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1723 | 0 |
|
1724 | 0 | return s->pending; |
1725 | 0 | } |
1726 | | |
1727 | 0 | _public_ int sd_event_source_get_io_fd(sd_event_source *s) { |
1728 | 0 | assert_return(s, -EINVAL); |
1729 | 0 | assert_return(s->type == SOURCE_IO, -EDOM); |
1730 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1731 | 0 |
|
1732 | 0 | return s->io.fd; |
1733 | 0 | } |
1734 | | |
1735 | 0 | _public_ int sd_event_source_set_io_fd(sd_event_source *s, int fd) { |
1736 | 0 | int r; |
1737 | 0 |
|
1738 | 0 | assert_return(s, -EINVAL); |
1739 | 0 | assert_return(fd >= 0, -EBADF); |
1740 | 0 | assert_return(s->type == SOURCE_IO, -EDOM); |
1741 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1742 | 0 |
|
1743 | 0 | if (s->io.fd == fd) |
1744 | 0 | return 0; |
1745 | 0 | |
1746 | 0 | if (s->enabled == SD_EVENT_OFF) { |
1747 | 0 | s->io.fd = fd; |
1748 | 0 | s->io.registered = false; |
1749 | 0 | } else { |
1750 | 0 | int saved_fd; |
1751 | 0 |
|
1752 | 0 | saved_fd = s->io.fd; |
1753 | 0 | assert(s->io.registered); |
1754 | 0 |
|
1755 | 0 | s->io.fd = fd; |
1756 | 0 | s->io.registered = false; |
1757 | 0 |
|
1758 | 0 | r = source_io_register(s, s->enabled, s->io.events); |
1759 | 0 | if (r < 0) { |
1760 | 0 | s->io.fd = saved_fd; |
1761 | 0 | s->io.registered = true; |
1762 | 0 | return r; |
1763 | 0 | } |
1764 | 0 | |
1765 | 0 | epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, saved_fd, NULL); |
1766 | 0 | } |
1767 | 0 |
|
1768 | 0 | return 0; |
1769 | 0 | } |
1770 | | |
1771 | 0 | _public_ int sd_event_source_get_io_fd_own(sd_event_source *s) { |
1772 | 0 | assert_return(s, -EINVAL); |
1773 | 0 | assert_return(s->type == SOURCE_IO, -EDOM); |
1774 | 0 |
|
1775 | 0 | return s->io.owned; |
1776 | 0 | } |
1777 | | |
1778 | 0 | _public_ int sd_event_source_set_io_fd_own(sd_event_source *s, int own) { |
1779 | 0 | assert_return(s, -EINVAL); |
1780 | 0 | assert_return(s->type == SOURCE_IO, -EDOM); |
1781 | 0 |
|
1782 | 0 | s->io.owned = own; |
1783 | 0 | return 0; |
1784 | 0 | } |
1785 | | |
1786 | 0 | _public_ int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events) { |
1787 | 0 | assert_return(s, -EINVAL); |
1788 | 0 | assert_return(events, -EINVAL); |
1789 | 0 | assert_return(s->type == SOURCE_IO, -EDOM); |
1790 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1791 | 0 |
|
1792 | 0 | *events = s->io.events; |
1793 | 0 | return 0; |
1794 | 0 | } |
1795 | | |
1796 | 3.80M | _public_ int sd_event_source_set_io_events(sd_event_source *s, uint32_t events) { |
1797 | 3.80M | int r; |
1798 | 3.80M | |
1799 | 3.80M | assert_return(s, -EINVAL); |
1800 | 3.80M | assert_return(s->type == SOURCE_IO, -EDOM); |
1801 | 3.80M | assert_return(!(events & ~(EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLPRI|EPOLLERR|EPOLLHUP|EPOLLET)), -EINVAL); |
1802 | 3.80M | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1803 | 3.80M | assert_return(!event_pid_changed(s->event), -ECHILD); |
1804 | 3.80M | |
1805 | 3.80M | /* edge-triggered updates are never skipped, so we can reset edges */ |
1806 | 3.80M | if (s->io.events == events && !(events & EPOLLET)) |
1807 | 2.94M | return 0; |
1808 | 858k | |
1809 | 858k | r = source_set_pending(s, false); |
1810 | 858k | if (r < 0) |
1811 | 0 | return r; |
1812 | 858k | |
1813 | 858k | if (s->enabled != SD_EVENT_OFF) { |
1814 | 858k | r = source_io_register(s, s->enabled, events); |
1815 | 858k | if (r < 0) |
1816 | 0 | return r; |
1817 | 858k | } |
1818 | 858k | |
1819 | 858k | s->io.events = events; |
1820 | 858k | |
1821 | 858k | return 0; |
1822 | 858k | } |
1823 | | |
1824 | 0 | _public_ int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents) { |
1825 | 0 | assert_return(s, -EINVAL); |
1826 | 0 | assert_return(revents, -EINVAL); |
1827 | 0 | assert_return(s->type == SOURCE_IO, -EDOM); |
1828 | 0 | assert_return(s->pending, -ENODATA); |
1829 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1830 | 0 |
|
1831 | 0 | *revents = s->io.revents; |
1832 | 0 | return 0; |
1833 | 0 | } |
1834 | | |
1835 | 0 | _public_ int sd_event_source_get_signal(sd_event_source *s) { |
1836 | 0 | assert_return(s, -EINVAL); |
1837 | 0 | assert_return(s->type == SOURCE_SIGNAL, -EDOM); |
1838 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1839 | 0 |
|
1840 | 0 | return s->signal.sig; |
1841 | 0 | } |
1842 | | |
1843 | 0 | _public_ int sd_event_source_get_priority(sd_event_source *s, int64_t *priority) { |
1844 | 0 | assert_return(s, -EINVAL); |
1845 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1846 | 0 |
|
1847 | 0 | *priority = s->priority; |
1848 | 0 | return 0; |
1849 | 0 | } |
1850 | | |
1851 | 162k | _public_ int sd_event_source_set_priority(sd_event_source *s, int64_t priority) { |
1852 | 162k | bool rm_inotify = false, rm_inode = false; |
1853 | 162k | struct inotify_data *new_inotify_data = NULL; |
1854 | 162k | struct inode_data *new_inode_data = NULL; |
1855 | 162k | int r; |
1856 | 162k | |
1857 | 162k | assert_return(s, -EINVAL); |
1858 | 162k | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
1859 | 162k | assert_return(!event_pid_changed(s->event), -ECHILD); |
1860 | 162k | |
1861 | 162k | if (s->priority == priority) |
1862 | 139k | return 0; |
1863 | 22.8k | |
1864 | 22.8k | if (s->type == SOURCE_INOTIFY) { |
1865 | 0 | struct inode_data *old_inode_data; |
1866 | 0 |
|
1867 | 0 | assert(s->inotify.inode_data); |
1868 | 0 | old_inode_data = s->inotify.inode_data; |
1869 | 0 |
|
1870 | 0 | /* We need the original fd to change the priority. If we don't have it we can't change the priority, |
1871 | 0 | * anymore. Note that we close any fds when entering the next event loop iteration, i.e. for inotify |
1872 | 0 | * events we allow priority changes only until the first following iteration. */ |
1873 | 0 | if (old_inode_data->fd < 0) |
1874 | 0 | return -EOPNOTSUPP; |
1875 | 0 | |
1876 | 0 | r = event_make_inotify_data(s->event, priority, &new_inotify_data); |
1877 | 0 | if (r < 0) |
1878 | 0 | return r; |
1879 | 0 | rm_inotify = r > 0; |
1880 | 0 |
|
1881 | 0 | r = event_make_inode_data(s->event, new_inotify_data, old_inode_data->dev, old_inode_data->ino, &new_inode_data); |
1882 | 0 | if (r < 0) |
1883 | 0 | goto fail; |
1884 | 0 | rm_inode = r > 0; |
1885 | 0 |
|
1886 | 0 | if (new_inode_data->fd < 0) { |
1887 | 0 | /* Duplicate the fd for the new inode object if we don't have any yet */ |
1888 | 0 | new_inode_data->fd = fcntl(old_inode_data->fd, F_DUPFD_CLOEXEC, 3); |
1889 | 0 | if (new_inode_data->fd < 0) { |
1890 | 0 | r = -errno; |
1891 | 0 | goto fail; |
1892 | 0 | } |
1893 | 0 | |
1894 | 0 | LIST_PREPEND(to_close, s->event->inode_data_to_close, new_inode_data); |
1895 | 0 | } |
1896 | 0 |
|
1897 | 0 | /* Move the event source to the new inode data structure */ |
1898 | 0 | LIST_REMOVE(inotify.by_inode_data, old_inode_data->event_sources, s); |
1899 | 0 | LIST_PREPEND(inotify.by_inode_data, new_inode_data->event_sources, s); |
1900 | 0 | s->inotify.inode_data = new_inode_data; |
1901 | 0 |
|
1902 | 0 | /* Now create the new watch */ |
1903 | 0 | r = inode_data_realize_watch(s->event, new_inode_data); |
1904 | 0 | if (r < 0) { |
1905 | 0 | /* Move it back */ |
1906 | 0 | LIST_REMOVE(inotify.by_inode_data, new_inode_data->event_sources, s); |
1907 | 0 | LIST_PREPEND(inotify.by_inode_data, old_inode_data->event_sources, s); |
1908 | 0 | s->inotify.inode_data = old_inode_data; |
1909 | 0 | goto fail; |
1910 | 0 | } |
1911 | 0 | |
1912 | 0 | s->priority = priority; |
1913 | 0 |
|
1914 | 0 | event_gc_inode_data(s->event, old_inode_data); |
1915 | 0 |
|
1916 | 22.8k | } else if (s->type == SOURCE_SIGNAL && s->enabled != SD_EVENT_OFF) { |
1917 | 0 | struct signal_data *old, *d; |
1918 | 0 |
|
1919 | 0 | /* Move us from the signalfd belonging to the old |
1920 | 0 | * priority to the signalfd of the new priority */ |
1921 | 0 |
|
1922 | 0 | assert_se(old = hashmap_get(s->event->signal_data, &s->priority)); |
1923 | 0 |
|
1924 | 0 | s->priority = priority; |
1925 | 0 |
|
1926 | 0 | r = event_make_signal_data(s->event, s->signal.sig, &d); |
1927 | 0 | if (r < 0) { |
1928 | 0 | s->priority = old->priority; |
1929 | 0 | return r; |
1930 | 0 | } |
1931 | 0 | |
1932 | 0 | event_unmask_signal_data(s->event, old, s->signal.sig); |
1933 | 0 | } else |
1934 | 22.8k | s->priority = priority; |
1935 | 22.8k | |
1936 | 22.8k | if (s->pending) |
1937 | 21.7k | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
1938 | 22.8k | |
1939 | 22.8k | if (s->prepare) |
1940 | 0 | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
1941 | 22.8k | |
1942 | 22.8k | if (s->type == SOURCE_EXIT) |
1943 | 0 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
1944 | 22.8k | |
1945 | 22.8k | return 0; |
1946 | 0 | |
1947 | 0 | fail: |
1948 | 0 | if (rm_inode) |
1949 | 0 | event_free_inode_data(s->event, new_inode_data); |
1950 | 0 |
|
1951 | 0 | if (rm_inotify) |
1952 | 0 | event_free_inotify_data(s->event, new_inotify_data); |
1953 | 0 |
|
1954 | 0 | return r; |
1955 | 22.8k | } |
1956 | | |
1957 | 0 | _public_ int sd_event_source_get_enabled(sd_event_source *s, int *m) { |
1958 | 0 | assert_return(s, -EINVAL); |
1959 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
1960 | 0 |
|
1961 | 0 | if (m) |
1962 | 0 | *m = s->enabled; |
1963 | 0 | return s->enabled != SD_EVENT_OFF; |
1964 | 0 | } |
1965 | | |
1966 | 5.55M | _public_ int sd_event_source_set_enabled(sd_event_source *s, int m) { |
1967 | 5.55M | int r; |
1968 | 5.55M | |
1969 | 5.55M | assert_return(s, -EINVAL); |
1970 | 5.55M | assert_return(IN_SET(m, SD_EVENT_OFF, SD_EVENT_ON, SD_EVENT_ONESHOT), -EINVAL); |
1971 | 5.55M | assert_return(!event_pid_changed(s->event), -ECHILD); |
1972 | 5.55M | |
1973 | 5.55M | /* If we are dead anyway, we are fine with turning off |
1974 | 5.55M | * sources, but everything else needs to fail. */ |
1975 | 5.55M | if (s->event->state == SD_EVENT_FINISHED) |
1976 | 0 | return m == SD_EVENT_OFF ? 0 : -ESTALE; |
1977 | 5.55M | |
1978 | 5.55M | if (s->enabled == m) |
1979 | 4.79M | return 0; |
1980 | 765k | |
1981 | 765k | if (m == SD_EVENT_OFF) { |
1982 | 422k | |
1983 | 422k | /* Unset the pending flag when this event source is disabled */ |
1984 | 422k | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { |
1985 | 47.5k | r = source_set_pending(s, false); |
1986 | 47.5k | if (r < 0) |
1987 | 0 | return r; |
1988 | 422k | } |
1989 | 422k | |
1990 | 422k | switch (s->type) { |
1991 | 422k | |
1992 | 422k | case SOURCE_IO: |
1993 | 34.9k | source_io_unregister(s); |
1994 | 34.9k | s->enabled = m; |
1995 | 34.9k | break; |
1996 | 422k | |
1997 | 422k | case SOURCE_TIME_REALTIME: |
1998 | 12.6k | case SOURCE_TIME_BOOTTIME: |
1999 | 12.6k | case SOURCE_TIME_MONOTONIC: |
2000 | 12.6k | case SOURCE_TIME_REALTIME_ALARM: |
2001 | 12.6k | case SOURCE_TIME_BOOTTIME_ALARM: { |
2002 | 12.6k | struct clock_data *d; |
2003 | 12.6k | |
2004 | 12.6k | s->enabled = m; |
2005 | 12.6k | d = event_get_clock_data(s->event, s->type); |
2006 | 12.6k | assert(d); |
2007 | 12.6k | |
2008 | 12.6k | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2009 | 12.6k | prioq_reshuffle(d->latest, s, &s->time.latest_index); |
2010 | 12.6k | d->needs_rearm = true; |
2011 | 12.6k | break; |
2012 | 12.6k | } |
2013 | 12.6k | |
2014 | 12.6k | case SOURCE_SIGNAL: |
2015 | 0 | s->enabled = m; |
2016 | 0 |
|
2017 | 0 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
2018 | 0 | break; |
2019 | 12.6k | |
2020 | 12.6k | case SOURCE_CHILD: |
2021 | 0 | s->enabled = m; |
2022 | 0 |
|
2023 | 0 | assert(s->event->n_enabled_child_sources > 0); |
2024 | 0 | s->event->n_enabled_child_sources--; |
2025 | 0 |
|
2026 | 0 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
2027 | 0 | break; |
2028 | 0 |
|
2029 | 7.38k | case SOURCE_EXIT: |
2030 | 7.38k | s->enabled = m; |
2031 | 7.38k | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
2032 | 7.38k | break; |
2033 | 0 |
|
2034 | 367k | case SOURCE_DEFER: |
2035 | 367k | case SOURCE_POST: |
2036 | 367k | case SOURCE_INOTIFY: |
2037 | 367k | s->enabled = m; |
2038 | 367k | break; |
2039 | 367k | |
2040 | 367k | default: |
2041 | 0 | assert_not_reached("Wut? I shouldn't exist."); |
2042 | 422k | } |
2043 | 422k | |
2044 | 422k | } else { |
2045 | 342k | |
2046 | 342k | /* Unset the pending flag when this event source is enabled */ |
2047 | 342k | if (s->enabled == SD_EVENT_OFF && !IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { |
2048 | 1 | r = source_set_pending(s, false); |
2049 | 1 | if (r < 0) |
2050 | 0 | return r; |
2051 | 342k | } |
2052 | 342k | |
2053 | 342k | switch (s->type) { |
2054 | 342k | |
2055 | 342k | case SOURCE_IO: |
2056 | 0 | r = source_io_register(s, m, s->io.events); |
2057 | 0 | if (r < 0) |
2058 | 0 | return r; |
2059 | 0 | |
2060 | 0 | s->enabled = m; |
2061 | 0 | break; |
2062 | 0 |
|
2063 | 1 | case SOURCE_TIME_REALTIME: |
2064 | 1 | case SOURCE_TIME_BOOTTIME: |
2065 | 1 | case SOURCE_TIME_MONOTONIC: |
2066 | 1 | case SOURCE_TIME_REALTIME_ALARM: |
2067 | 1 | case SOURCE_TIME_BOOTTIME_ALARM: { |
2068 | 1 | struct clock_data *d; |
2069 | 1 | |
2070 | 1 | s->enabled = m; |
2071 | 1 | d = event_get_clock_data(s->event, s->type); |
2072 | 1 | assert(d); |
2073 | 1 | |
2074 | 1 | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2075 | 1 | prioq_reshuffle(d->latest, s, &s->time.latest_index); |
2076 | 1 | d->needs_rearm = true; |
2077 | 1 | break; |
2078 | 1 | } |
2079 | 1 | |
2080 | 1 | case SOURCE_SIGNAL: |
2081 | 0 |
|
2082 | 0 | s->enabled = m; |
2083 | 0 |
|
2084 | 0 | r = event_make_signal_data(s->event, s->signal.sig, NULL); |
2085 | 0 | if (r < 0) { |
2086 | 0 | s->enabled = SD_EVENT_OFF; |
2087 | 0 | event_gc_signal_data(s->event, &s->priority, s->signal.sig); |
2088 | 0 | return r; |
2089 | 0 | } |
2090 | 0 | |
2091 | 0 | break; |
2092 | 0 |
|
2093 | 0 | case SOURCE_CHILD: |
2094 | 0 |
|
2095 | 0 | if (s->enabled == SD_EVENT_OFF) |
2096 | 0 | s->event->n_enabled_child_sources++; |
2097 | 0 |
|
2098 | 0 | s->enabled = m; |
2099 | 0 |
|
2100 | 0 | r = event_make_signal_data(s->event, SIGCHLD, NULL); |
2101 | 0 | if (r < 0) { |
2102 | 0 | s->enabled = SD_EVENT_OFF; |
2103 | 0 | s->event->n_enabled_child_sources--; |
2104 | 0 | event_gc_signal_data(s->event, &s->priority, SIGCHLD); |
2105 | 0 | return r; |
2106 | 0 | } |
2107 | 0 | |
2108 | 0 | break; |
2109 | 0 |
|
2110 | 0 | case SOURCE_EXIT: |
2111 | 0 | s->enabled = m; |
2112 | 0 | prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index); |
2113 | 0 | break; |
2114 | 0 |
|
2115 | 342k | case SOURCE_DEFER: |
2116 | 342k | case SOURCE_POST: |
2117 | 342k | case SOURCE_INOTIFY: |
2118 | 342k | s->enabled = m; |
2119 | 342k | break; |
2120 | 342k | |
2121 | 342k | default: |
2122 | 0 | assert_not_reached("Wut? I shouldn't exist."); |
2123 | 342k | } |
2124 | 342k | } |
2125 | 765k | |
2126 | 765k | if (s->pending) |
2127 | 710k | prioq_reshuffle(s->event->pending, s, &s->pending_index); |
2128 | 765k | |
2129 | 765k | if (s->prepare) |
2130 | 7.38k | prioq_reshuffle(s->event->prepare, s, &s->prepare_index); |
2131 | 765k | |
2132 | 765k | return 0; |
2133 | 765k | } |
2134 | | |
2135 | 0 | _public_ int sd_event_source_get_time(sd_event_source *s, uint64_t *usec) { |
2136 | 0 | assert_return(s, -EINVAL); |
2137 | 0 | assert_return(usec, -EINVAL); |
2138 | 0 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
2139 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
2140 | 0 |
|
2141 | 0 | *usec = s->time.next; |
2142 | 0 | return 0; |
2143 | 0 | } |
2144 | | |
2145 | 875k | _public_ int sd_event_source_set_time(sd_event_source *s, uint64_t usec) { |
2146 | 875k | struct clock_data *d; |
2147 | 875k | int r; |
2148 | 875k | |
2149 | 875k | assert_return(s, -EINVAL); |
2150 | 875k | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
2151 | 875k | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
2152 | 875k | assert_return(!event_pid_changed(s->event), -ECHILD); |
2153 | 875k | |
2154 | 875k | r = source_set_pending(s, false); |
2155 | 875k | if (r < 0) |
2156 | 0 | return r; |
2157 | 875k | |
2158 | 875k | s->time.next = usec; |
2159 | 875k | |
2160 | 875k | d = event_get_clock_data(s->event, s->type); |
2161 | 875k | assert(d); |
2162 | 875k | |
2163 | 875k | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2164 | 875k | prioq_reshuffle(d->latest, s, &s->time.latest_index); |
2165 | 875k | d->needs_rearm = true; |
2166 | 875k | |
2167 | 875k | return 0; |
2168 | 875k | } |
2169 | | |
2170 | 0 | _public_ int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec) { |
2171 | 0 | assert_return(s, -EINVAL); |
2172 | 0 | assert_return(usec, -EINVAL); |
2173 | 0 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
2174 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
2175 | 0 |
|
2176 | 0 | *usec = s->time.accuracy; |
2177 | 0 | return 0; |
2178 | 0 | } |
2179 | | |
2180 | 1 | _public_ int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec) { |
2181 | 1 | struct clock_data *d; |
2182 | 1 | int r; |
2183 | 1 | |
2184 | 1 | assert_return(s, -EINVAL); |
2185 | 1 | assert_return(usec != (uint64_t) -1, -EINVAL); |
2186 | 1 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
2187 | 1 | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
2188 | 1 | assert_return(!event_pid_changed(s->event), -ECHILD); |
2189 | 1 | |
2190 | 1 | r = source_set_pending(s, false); |
2191 | 1 | if (r < 0) |
2192 | 0 | return r; |
2193 | 1 | |
2194 | 1 | if (usec == 0) |
2195 | 1 | usec = DEFAULT_ACCURACY_USEC; |
2196 | 1 | |
2197 | 1 | s->time.accuracy = usec; |
2198 | 1 | |
2199 | 1 | d = event_get_clock_data(s->event, s->type); |
2200 | 1 | assert(d); |
2201 | 1 | |
2202 | 1 | prioq_reshuffle(d->latest, s, &s->time.latest_index); |
2203 | 1 | d->needs_rearm = true; |
2204 | 1 | |
2205 | 1 | return 0; |
2206 | 1 | } |
2207 | | |
2208 | 1 | _public_ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock) { |
2209 | 1 | assert_return(s, -EINVAL); |
2210 | 1 | assert_return(clock, -EINVAL); |
2211 | 1 | assert_return(EVENT_SOURCE_IS_TIME(s->type), -EDOM); |
2212 | 1 | assert_return(!event_pid_changed(s->event), -ECHILD); |
2213 | 1 | |
2214 | 1 | *clock = event_source_type_to_clock(s->type); |
2215 | 1 | return 0; |
2216 | 1 | } |
2217 | | |
2218 | 0 | _public_ int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid) { |
2219 | 0 | assert_return(s, -EINVAL); |
2220 | 0 | assert_return(pid, -EINVAL); |
2221 | 0 | assert_return(s->type == SOURCE_CHILD, -EDOM); |
2222 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
2223 | 0 |
|
2224 | 0 | *pid = s->child.pid; |
2225 | 0 | return 0; |
2226 | 0 | } |
2227 | | |
2228 | 0 | _public_ int sd_event_source_get_inotify_mask(sd_event_source *s, uint32_t *mask) { |
2229 | 0 | assert_return(s, -EINVAL); |
2230 | 0 | assert_return(mask, -EINVAL); |
2231 | 0 | assert_return(s->type == SOURCE_INOTIFY, -EDOM); |
2232 | 0 | assert_return(!event_pid_changed(s->event), -ECHILD); |
2233 | 0 |
|
2234 | 0 | *mask = s->inotify.mask; |
2235 | 0 | return 0; |
2236 | 0 | } |
2237 | | |
2238 | 47.4k | _public_ int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback) { |
2239 | 47.4k | int r; |
2240 | 47.4k | |
2241 | 47.4k | assert_return(s, -EINVAL); |
2242 | 47.4k | assert_return(s->type != SOURCE_EXIT, -EDOM); |
2243 | 47.4k | assert_return(s->event->state != SD_EVENT_FINISHED, -ESTALE); |
2244 | 47.4k | assert_return(!event_pid_changed(s->event), -ECHILD); |
2245 | 47.4k | |
2246 | 47.4k | if (s->prepare == callback) |
2247 | 0 | return 0; |
2248 | 47.4k | |
2249 | 47.4k | if (callback && s->prepare) { |
2250 | 0 | s->prepare = callback; |
2251 | 0 | return 0; |
2252 | 0 | } |
2253 | 47.4k | |
2254 | 47.4k | r = prioq_ensure_allocated(&s->event->prepare, prepare_prioq_compare); |
2255 | 47.4k | if (r < 0) |
2256 | 0 | return r; |
2257 | 47.4k | |
2258 | 47.4k | s->prepare = callback; |
2259 | 47.4k | |
2260 | 47.4k | if (callback) { |
2261 | 47.4k | r = prioq_put(s->event->prepare, s, &s->prepare_index); |
2262 | 47.4k | if (r < 0) |
2263 | 0 | return r; |
2264 | 0 | } else |
2265 | 0 | prioq_remove(s->event->prepare, s, &s->prepare_index); |
2266 | 47.4k | |
2267 | 47.4k | return 0; |
2268 | 47.4k | } |
2269 | | |
2270 | 0 | _public_ void* sd_event_source_get_userdata(sd_event_source *s) { |
2271 | 0 | assert_return(s, NULL); |
2272 | 0 |
|
2273 | 0 | return s->userdata; |
2274 | 0 | } |
2275 | | |
2276 | 1 | _public_ void *sd_event_source_set_userdata(sd_event_source *s, void *userdata) { |
2277 | 1 | void *ret; |
2278 | 1 | |
2279 | 1 | assert_return(s, NULL); |
2280 | 1 | |
2281 | 1 | ret = s->userdata; |
2282 | 1 | s->userdata = userdata; |
2283 | 1 | |
2284 | 1 | return ret; |
2285 | 1 | } |
2286 | | |
2287 | 4.50k | static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) { |
2288 | 4.50k | usec_t c; |
2289 | 4.50k | assert(e); |
2290 | 4.50k | assert(a <= b); |
2291 | 4.50k | |
2292 | 4.50k | if (a <= 0) |
2293 | 4.50k | return 0; |
2294 | 0 | if (a >= USEC_INFINITY) |
2295 | 0 | return USEC_INFINITY; |
2296 | 0 | |
2297 | 0 | if (b <= a + 1) |
2298 | 0 | return a; |
2299 | 0 | |
2300 | 0 | initialize_perturb(e); |
2301 | 0 |
|
2302 | 0 | /* |
2303 | 0 | Find a good time to wake up again between times a and b. We |
2304 | 0 | have two goals here: |
2305 | 0 |
|
2306 | 0 | a) We want to wake up as seldom as possible, hence prefer |
2307 | 0 | later times over earlier times. |
2308 | 0 |
|
2309 | 0 | b) But if we have to wake up, then let's make sure to |
2310 | 0 | dispatch as much as possible on the entire system. |
2311 | 0 |
|
2312 | 0 | We implement this by waking up everywhere at the same time |
2313 | 0 | within any given minute if we can, synchronised via the |
2314 | 0 | perturbation value determined from the boot ID. If we can't, |
2315 | 0 | then we try to find the same spot in every 10s, then 1s and |
2316 | 0 | then 250ms step. Otherwise, we pick the last possible time |
2317 | 0 | to wake up. |
2318 | 0 | */ |
2319 | 0 |
|
2320 | 0 | c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb; |
2321 | 0 | if (c >= b) { |
2322 | 0 | if (_unlikely_(c < USEC_PER_MINUTE)) |
2323 | 0 | return b; |
2324 | 0 | |
2325 | 0 | c -= USEC_PER_MINUTE; |
2326 | 0 | } |
2327 | 0 |
|
2328 | 0 | if (c >= a) |
2329 | 0 | return c; |
2330 | 0 | |
2331 | 0 | c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10)); |
2332 | 0 | if (c >= b) { |
2333 | 0 | if (_unlikely_(c < USEC_PER_SEC*10)) |
2334 | 0 | return b; |
2335 | 0 | |
2336 | 0 | c -= USEC_PER_SEC*10; |
2337 | 0 | } |
2338 | 0 |
|
2339 | 0 | if (c >= a) |
2340 | 0 | return c; |
2341 | 0 | |
2342 | 0 | c = (b / USEC_PER_SEC) * USEC_PER_SEC + (e->perturb % USEC_PER_SEC); |
2343 | 0 | if (c >= b) { |
2344 | 0 | if (_unlikely_(c < USEC_PER_SEC)) |
2345 | 0 | return b; |
2346 | 0 | |
2347 | 0 | c -= USEC_PER_SEC; |
2348 | 0 | } |
2349 | 0 |
|
2350 | 0 | if (c >= a) |
2351 | 0 | return c; |
2352 | 0 | |
2353 | 0 | c = (b / (USEC_PER_MSEC*250)) * (USEC_PER_MSEC*250) + (e->perturb % (USEC_PER_MSEC*250)); |
2354 | 0 | if (c >= b) { |
2355 | 0 | if (_unlikely_(c < USEC_PER_MSEC*250)) |
2356 | 0 | return b; |
2357 | 0 | |
2358 | 0 | c -= USEC_PER_MSEC*250; |
2359 | 0 | } |
2360 | 0 |
|
2361 | 0 | if (c >= a) |
2362 | 0 | return c; |
2363 | 0 | |
2364 | 0 | return b; |
2365 | 0 | } |
2366 | | |
2367 | | static int event_arm_timer( |
2368 | | sd_event *e, |
2369 | 14.0M | struct clock_data *d) { |
2370 | 14.0M | |
2371 | 14.0M | struct itimerspec its = {}; |
2372 | 14.0M | sd_event_source *a, *b; |
2373 | 14.0M | usec_t t; |
2374 | 14.0M | int r; |
2375 | 14.0M | |
2376 | 14.0M | assert(e); |
2377 | 14.0M | assert(d); |
2378 | 14.0M | |
2379 | 14.0M | if (!d->needs_rearm) |
2380 | 13.1M | return 0; |
2381 | 883k | else |
2382 | 883k | d->needs_rearm = false; |
2383 | 14.0M | |
2384 | 14.0M | a = prioq_peek(d->earliest); |
2385 | 883k | if (!a || a->enabled == SD_EVENT_OFF || a->time.next == USEC_INFINITY) { |
2386 | 879k | |
2387 | 879k | if (d->fd < 0) |
2388 | 0 | return 0; |
2389 | 879k | |
2390 | 879k | if (d->next == USEC_INFINITY) |
2391 | 879k | return 0; |
2392 | 0 | |
2393 | 0 | /* disarm */ |
2394 | 0 | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
2395 | 0 | if (r < 0) |
2396 | 0 | return r; |
2397 | 0 | |
2398 | 0 | d->next = USEC_INFINITY; |
2399 | 0 | return 0; |
2400 | 0 | } |
2401 | 4.50k | |
2402 | 4.50k | b = prioq_peek(d->latest); |
2403 | 4.50k | assert_se(b && b->enabled != SD_EVENT_OFF); |
2404 | 4.50k | |
2405 | 4.50k | t = sleep_between(e, a->time.next, time_event_source_latest(b)); |
2406 | 4.50k | if (d->next == t) |
2407 | 0 | return 0; |
2408 | 4.50k | |
2409 | 4.50k | assert_se(d->fd >= 0); |
2410 | 4.50k | |
2411 | 4.50k | if (t == 0) { |
2412 | 4.50k | /* We don' want to disarm here, just mean some time looooong ago. */ |
2413 | 4.50k | its.it_value.tv_sec = 0; |
2414 | 4.50k | its.it_value.tv_nsec = 1; |
2415 | 4.50k | } else |
2416 | 0 | timespec_store(&its.it_value, t); |
2417 | 4.50k | |
2418 | 4.50k | r = timerfd_settime(d->fd, TFD_TIMER_ABSTIME, &its, NULL); |
2419 | 4.50k | if (r < 0) |
2420 | 0 | return -errno; |
2421 | 4.50k | |
2422 | 4.50k | d->next = t; |
2423 | 4.50k | return 0; |
2424 | 4.50k | } |
2425 | | |
2426 | 4.76M | static int process_io(sd_event *e, sd_event_source *s, uint32_t revents) { |
2427 | 4.76M | assert(e); |
2428 | 4.76M | assert(s); |
2429 | 4.76M | assert(s->type == SOURCE_IO); |
2430 | 4.76M | |
2431 | 4.76M | /* If the event source was already pending, we just OR in the |
2432 | 4.76M | * new revents, otherwise we reset the value. The ORing is |
2433 | 4.76M | * necessary to handle EPOLLONESHOT events properly where |
2434 | 4.76M | * readability might happen independently of writability, and |
2435 | 4.76M | * we need to keep track of both */ |
2436 | 4.76M | |
2437 | 4.76M | if (s->pending) |
2438 | 3.51M | s->io.revents |= revents; |
2439 | 1.24M | else |
2440 | 1.24M | s->io.revents = revents; |
2441 | 4.76M | |
2442 | 4.76M | return source_set_pending(s, true); |
2443 | 4.76M | } |
2444 | | |
2445 | 4.50k | static int flush_timer(sd_event *e, int fd, uint32_t events, usec_t *next) { |
2446 | 4.50k | uint64_t x; |
2447 | 4.50k | ssize_t ss; |
2448 | 4.50k | |
2449 | 4.50k | assert(e); |
2450 | 4.50k | assert(fd >= 0); |
2451 | 4.50k | |
2452 | 4.50k | assert_return(events == EPOLLIN, -EIO); |
2453 | 4.50k | |
2454 | 4.50k | ss = read(fd, &x, sizeof(x)); |
2455 | 4.50k | if (ss < 0) { |
2456 | 0 | if (IN_SET(errno, EAGAIN, EINTR)) |
2457 | 0 | return 0; |
2458 | 0 | |
2459 | 0 | return -errno; |
2460 | 0 | } |
2461 | 4.50k | |
2462 | 4.50k | if (_unlikely_(ss != sizeof(x))) |
2463 | 4.50k | return -EIO; |
2464 | 4.50k | |
2465 | 4.50k | if (next) |
2466 | 4.50k | *next = USEC_INFINITY; |
2467 | 4.50k | |
2468 | 4.50k | return 0; |
2469 | 4.50k | } |
2470 | | |
2471 | | static int process_timer( |
2472 | | sd_event *e, |
2473 | | usec_t n, |
2474 | 14.0M | struct clock_data *d) { |
2475 | 14.0M | |
2476 | 14.0M | sd_event_source *s; |
2477 | 14.0M | int r; |
2478 | 14.0M | |
2479 | 14.0M | assert(e); |
2480 | 14.0M | assert(d); |
2481 | 14.0M | |
2482 | 14.0M | for (;;) { |
2483 | 14.0M | s = prioq_peek(d->earliest); |
2484 | 14.0M | if (!s || |
2485 | 14.0M | s->time.next > n || |
2486 | 14.0M | s->enabled == SD_EVENT_OFF || |
2487 | 14.0M | s->pending) |
2488 | 14.0M | break; |
2489 | 4.50k | |
2490 | 4.50k | r = source_set_pending(s, true); |
2491 | 4.50k | if (r < 0) |
2492 | 0 | return r; |
2493 | 4.50k | |
2494 | 4.50k | prioq_reshuffle(d->earliest, s, &s->time.earliest_index); |
2495 | 4.50k | prioq_reshuffle(d->latest, s, &s->time.latest_index); |
2496 | 4.50k | d->needs_rearm = true; |
2497 | 4.50k | } |
2498 | 14.0M | |
2499 | 14.0M | return 0; |
2500 | 14.0M | } |
2501 | | |
2502 | 0 | static int process_child(sd_event *e) { |
2503 | 0 | sd_event_source *s; |
2504 | 0 | Iterator i; |
2505 | 0 | int r; |
2506 | 0 |
|
2507 | 0 | assert(e); |
2508 | 0 |
|
2509 | 0 | e->need_process_child = false; |
2510 | 0 |
|
2511 | 0 | /* |
2512 | 0 | So, this is ugly. We iteratively invoke waitid() with P_PID |
2513 | 0 | + WNOHANG for each PID we wait for, instead of using |
2514 | 0 | P_ALL. This is because we only want to get child |
2515 | 0 | information of very specific child processes, and not all |
2516 | 0 | of them. We might not have processed the SIGCHLD even of a |
2517 | 0 | previous invocation and we don't want to maintain a |
2518 | 0 | unbounded *per-child* event queue, hence we really don't |
2519 | 0 | want anything flushed out of the kernel's queue that we |
2520 | 0 | don't care about. Since this is O(n) this means that if you |
2521 | 0 | have a lot of processes you probably want to handle SIGCHLD |
2522 | 0 | yourself. |
2523 | 0 |
|
2524 | 0 | We do not reap the children here (by using WNOWAIT), this |
2525 | 0 | is only done after the event source is dispatched so that |
2526 | 0 | the callback still sees the process as a zombie. |
2527 | 0 | */ |
2528 | 0 |
|
2529 | 0 | HASHMAP_FOREACH(s, e->child_sources, i) { |
2530 | 0 | assert(s->type == SOURCE_CHILD); |
2531 | 0 |
|
2532 | 0 | if (s->pending) |
2533 | 0 | continue; |
2534 | 0 | |
2535 | 0 | if (s->enabled == SD_EVENT_OFF) |
2536 | 0 | continue; |
2537 | 0 | |
2538 | 0 | zero(s->child.siginfo); |
2539 | 0 | r = waitid(P_PID, s->child.pid, &s->child.siginfo, |
2540 | 0 | WNOHANG | (s->child.options & WEXITED ? WNOWAIT : 0) | s->child.options); |
2541 | 0 | if (r < 0) |
2542 | 0 | return -errno; |
2543 | 0 | |
2544 | 0 | if (s->child.siginfo.si_pid != 0) { |
2545 | 0 | bool zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
2546 | 0 |
|
2547 | 0 | if (!zombie && (s->child.options & WEXITED)) { |
2548 | 0 | /* If the child isn't dead then let's |
2549 | 0 | * immediately remove the state change |
2550 | 0 | * from the queue, since there's no |
2551 | 0 | * benefit in leaving it queued */ |
2552 | 0 |
|
2553 | 0 | assert(s->child.options & (WSTOPPED|WCONTINUED)); |
2554 | 0 | waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|(s->child.options & (WSTOPPED|WCONTINUED))); |
2555 | 0 | } |
2556 | 0 |
|
2557 | 0 | r = source_set_pending(s, true); |
2558 | 0 | if (r < 0) |
2559 | 0 | return r; |
2560 | 0 | } |
2561 | 0 | } |
2562 | 0 |
|
2563 | 0 | return 0; |
2564 | 0 | } |
2565 | | |
2566 | 0 | static int process_signal(sd_event *e, struct signal_data *d, uint32_t events) { |
2567 | 0 | bool read_one = false; |
2568 | 0 | int r; |
2569 | 0 |
|
2570 | 0 | assert(e); |
2571 | 0 | assert(d); |
2572 | 0 | assert_return(events == EPOLLIN, -EIO); |
2573 | 0 |
|
2574 | 0 | /* If there's a signal queued on this priority and SIGCHLD is |
2575 | 0 | on this priority too, then make sure to recheck the |
2576 | 0 | children we watch. This is because we only ever dequeue |
2577 | 0 | the first signal per priority, and if we dequeue one, and |
2578 | 0 | SIGCHLD might be enqueued later we wouldn't know, but we |
2579 | 0 | might have higher priority children we care about hence we |
2580 | 0 | need to check that explicitly. */ |
2581 | 0 |
|
2582 | 0 | if (sigismember(&d->sigset, SIGCHLD)) |
2583 | 0 | e->need_process_child = true; |
2584 | 0 |
|
2585 | 0 | /* If there's already an event source pending for this |
2586 | 0 | * priority we don't read another */ |
2587 | 0 | if (d->current) |
2588 | 0 | return 0; |
2589 | 0 | |
2590 | 0 | for (;;) { |
2591 | 0 | struct signalfd_siginfo si; |
2592 | 0 | ssize_t n; |
2593 | 0 | sd_event_source *s = NULL; |
2594 | 0 |
|
2595 | 0 | n = read(d->fd, &si, sizeof(si)); |
2596 | 0 | if (n < 0) { |
2597 | 0 | if (IN_SET(errno, EAGAIN, EINTR)) |
2598 | 0 | return read_one; |
2599 | 0 | |
2600 | 0 | return -errno; |
2601 | 0 | } |
2602 | 0 | |
2603 | 0 | if (_unlikely_(n != sizeof(si))) |
2604 | 0 | return -EIO; |
2605 | 0 | |
2606 | 0 | assert(SIGNAL_VALID(si.ssi_signo)); |
2607 | 0 |
|
2608 | 0 | read_one = true; |
2609 | 0 |
|
2610 | 0 | if (e->signal_sources) |
2611 | 0 | s = e->signal_sources[si.ssi_signo]; |
2612 | 0 | if (!s) |
2613 | 0 | continue; |
2614 | 0 | if (s->pending) |
2615 | 0 | continue; |
2616 | 0 | |
2617 | 0 | s->signal.siginfo = si; |
2618 | 0 | d->current = s; |
2619 | 0 |
|
2620 | 0 | r = source_set_pending(s, true); |
2621 | 0 | if (r < 0) |
2622 | 0 | return r; |
2623 | 0 | |
2624 | 0 | return 1; |
2625 | 0 | } |
2626 | 0 | } |
2627 | | |
2628 | 0 | static int event_inotify_data_read(sd_event *e, struct inotify_data *d, uint32_t revents) { |
2629 | 0 | ssize_t n; |
2630 | 0 |
|
2631 | 0 | assert(e); |
2632 | 0 | assert(d); |
2633 | 0 |
|
2634 | 0 | assert_return(revents == EPOLLIN, -EIO); |
2635 | 0 |
|
2636 | 0 | /* If there's already an event source pending for this priority, don't read another */ |
2637 | 0 | if (d->n_pending > 0) |
2638 | 0 | return 0; |
2639 | 0 | |
2640 | 0 | /* Is the read buffer non-empty? If so, let's not read more */ |
2641 | 0 | if (d->buffer_filled > 0) |
2642 | 0 | return 0; |
2643 | 0 | |
2644 | 0 | n = read(d->fd, &d->buffer, sizeof(d->buffer)); |
2645 | 0 | if (n < 0) { |
2646 | 0 | if (IN_SET(errno, EAGAIN, EINTR)) |
2647 | 0 | return 0; |
2648 | 0 | |
2649 | 0 | return -errno; |
2650 | 0 | } |
2651 | 0 | |
2652 | 0 | assert(n > 0); |
2653 | 0 | d->buffer_filled = (size_t) n; |
2654 | 0 | LIST_PREPEND(buffered, e->inotify_data_buffered, d); |
2655 | 0 |
|
2656 | 0 | return 1; |
2657 | 0 | } |
2658 | | |
2659 | 0 | static void event_inotify_data_drop(sd_event *e, struct inotify_data *d, size_t sz) { |
2660 | 0 | assert(e); |
2661 | 0 | assert(d); |
2662 | 0 | assert(sz <= d->buffer_filled); |
2663 | 0 |
|
2664 | 0 | if (sz == 0) |
2665 | 0 | return; |
2666 | 0 | |
2667 | 0 | /* Move the rest to the buffer to the front, in order to get things properly aligned again */ |
2668 | 0 | memmove(d->buffer.raw, d->buffer.raw + sz, d->buffer_filled - sz); |
2669 | 0 | d->buffer_filled -= sz; |
2670 | 0 |
|
2671 | 0 | if (d->buffer_filled == 0) |
2672 | 0 | LIST_REMOVE(buffered, e->inotify_data_buffered, d); |
2673 | 0 | } |
2674 | | |
2675 | 0 | static int event_inotify_data_process(sd_event *e, struct inotify_data *d) { |
2676 | 0 | int r; |
2677 | 0 |
|
2678 | 0 | assert(e); |
2679 | 0 | assert(d); |
2680 | 0 |
|
2681 | 0 | /* If there's already an event source pending for this priority, don't read another */ |
2682 | 0 | if (d->n_pending > 0) |
2683 | 0 | return 0; |
2684 | 0 | |
2685 | 0 | while (d->buffer_filled > 0) { |
2686 | 0 | size_t sz; |
2687 | 0 |
|
2688 | 0 | /* Let's validate that the event structures are complete */ |
2689 | 0 | if (d->buffer_filled < offsetof(struct inotify_event, name)) |
2690 | 0 | return -EIO; |
2691 | 0 | |
2692 | 0 | sz = offsetof(struct inotify_event, name) + d->buffer.ev.len; |
2693 | 0 | if (d->buffer_filled < sz) |
2694 | 0 | return -EIO; |
2695 | 0 | |
2696 | 0 | if (d->buffer.ev.mask & IN_Q_OVERFLOW) { |
2697 | 0 | struct inode_data *inode_data; |
2698 | 0 | Iterator i; |
2699 | 0 |
|
2700 | 0 | /* The queue overran, let's pass this event to all event sources connected to this inotify |
2701 | 0 | * object */ |
2702 | 0 |
|
2703 | 0 | HASHMAP_FOREACH(inode_data, d->inodes, i) { |
2704 | 0 | sd_event_source *s; |
2705 | 0 |
|
2706 | 0 | LIST_FOREACH(inotify.by_inode_data, s, inode_data->event_sources) { |
2707 | 0 |
|
2708 | 0 | if (s->enabled == SD_EVENT_OFF) |
2709 | 0 | continue; |
2710 | 0 | |
2711 | 0 | r = source_set_pending(s, true); |
2712 | 0 | if (r < 0) |
2713 | 0 | return r; |
2714 | 0 | } |
2715 | 0 | } |
2716 | 0 | } else { |
2717 | 0 | struct inode_data *inode_data; |
2718 | 0 | sd_event_source *s; |
2719 | 0 |
|
2720 | 0 | /* Find the inode object for this watch descriptor. If IN_IGNORED is set we also remove it from |
2721 | 0 | * our watch descriptor table. */ |
2722 | 0 | if (d->buffer.ev.mask & IN_IGNORED) { |
2723 | 0 |
|
2724 | 0 | inode_data = hashmap_remove(d->wd, INT_TO_PTR(d->buffer.ev.wd)); |
2725 | 0 | if (!inode_data) { |
2726 | 0 | event_inotify_data_drop(e, d, sz); |
2727 | 0 | continue; |
2728 | 0 | } |
2729 | 0 | |
2730 | 0 | /* The watch descriptor was removed by the kernel, let's drop it here too */ |
2731 | 0 | inode_data->wd = -1; |
2732 | 0 | } else { |
2733 | 0 | inode_data = hashmap_get(d->wd, INT_TO_PTR(d->buffer.ev.wd)); |
2734 | 0 | if (!inode_data) { |
2735 | 0 | event_inotify_data_drop(e, d, sz); |
2736 | 0 | continue; |
2737 | 0 | } |
2738 | 0 | } |
2739 | 0 | |
2740 | 0 | /* Trigger all event sources that are interested in these events. Also trigger all event |
2741 | 0 | * sources if IN_IGNORED or IN_UNMOUNT is set. */ |
2742 | 0 | LIST_FOREACH(inotify.by_inode_data, s, inode_data->event_sources) { |
2743 | 0 |
|
2744 | 0 | if (s->enabled == SD_EVENT_OFF) |
2745 | 0 | continue; |
2746 | 0 | |
2747 | 0 | if ((d->buffer.ev.mask & (IN_IGNORED|IN_UNMOUNT)) == 0 && |
2748 | 0 | (s->inotify.mask & d->buffer.ev.mask & IN_ALL_EVENTS) == 0) |
2749 | 0 | continue; |
2750 | 0 | |
2751 | 0 | r = source_set_pending(s, true); |
2752 | 0 | if (r < 0) |
2753 | 0 | return r; |
2754 | 0 | } |
2755 | 0 | } |
2756 | 0 |
|
2757 | 0 | /* Something pending now? If so, let's finish, otherwise let's read more. */ |
2758 | 0 | if (d->n_pending > 0) |
2759 | 0 | return 1; |
2760 | 0 | } |
2761 | 0 |
|
2762 | 0 | return 0; |
2763 | 0 | } |
2764 | | |
2765 | 2.81M | static int process_inotify(sd_event *e) { |
2766 | 2.81M | struct inotify_data *d; |
2767 | 2.81M | int r, done = 0; |
2768 | 2.81M | |
2769 | 2.81M | assert(e); |
2770 | 2.81M | |
2771 | 2.81M | LIST_FOREACH(buffered, d, e->inotify_data_buffered) { |
2772 | 0 | r = event_inotify_data_process(e, d); |
2773 | 0 | if (r < 0) |
2774 | 0 | return r; |
2775 | 0 | if (r > 0) |
2776 | 0 | done ++; |
2777 | 0 | } |
2778 | 2.81M | |
2779 | 2.81M | return done; |
2780 | 2.81M | } |
2781 | | |
2782 | 2.81M | static int source_dispatch(sd_event_source *s) { |
2783 | 2.81M | EventSourceType saved_type; |
2784 | 2.81M | int r = 0; |
2785 | 2.81M | |
2786 | 2.81M | assert(s); |
2787 | 2.81M | assert(s->pending || s->type == SOURCE_EXIT); |
2788 | 2.81M | |
2789 | 2.81M | /* Save the event source type, here, so that we still know it after the event callback which might invalidate |
2790 | 2.81M | * the event. */ |
2791 | 2.81M | saved_type = s->type; |
2792 | 2.81M | |
2793 | 2.81M | if (!IN_SET(s->type, SOURCE_DEFER, SOURCE_EXIT)) { |
2794 | 1.20M | r = source_set_pending(s, false); |
2795 | 1.20M | if (r < 0) |
2796 | 0 | return r; |
2797 | 2.81M | } |
2798 | 2.81M | |
2799 | 2.81M | if (s->type != SOURCE_POST) { |
2800 | 2.81M | sd_event_source *z; |
2801 | 2.81M | Iterator i; |
2802 | 2.81M | |
2803 | 2.81M | /* If we execute a non-post source, let's mark all |
2804 | 2.81M | * post sources as pending */ |
2805 | 2.81M | |
2806 | 2.81M | SET_FOREACH(z, s->event->post_sources, i) { |
2807 | 0 | if (z->enabled == SD_EVENT_OFF) |
2808 | 0 | continue; |
2809 | 0 | |
2810 | 0 | r = source_set_pending(z, true); |
2811 | 0 | if (r < 0) |
2812 | 0 | return r; |
2813 | 0 | } |
2814 | 2.81M | } |
2815 | 2.81M | |
2816 | 2.81M | if (s->enabled == SD_EVENT_ONESHOT) { |
2817 | 12.0k | r = sd_event_source_set_enabled(s, SD_EVENT_OFF); |
2818 | 12.0k | if (r < 0) |
2819 | 0 | return r; |
2820 | 2.81M | } |
2821 | 2.81M | |
2822 | 2.81M | s->dispatching = true; |
2823 | 2.81M | |
2824 | 2.81M | switch (s->type) { |
2825 | 2.81M | |
2826 | 2.81M | case SOURCE_IO: |
2827 | 1.20M | r = s->io.callback(s, s->io.fd, s->io.revents, s->userdata); |
2828 | 1.20M | break; |
2829 | 2.81M | |
2830 | 2.81M | case SOURCE_TIME_REALTIME: |
2831 | 0 | case SOURCE_TIME_BOOTTIME: |
2832 | 0 | case SOURCE_TIME_MONOTONIC: |
2833 | 0 | case SOURCE_TIME_REALTIME_ALARM: |
2834 | 0 | case SOURCE_TIME_BOOTTIME_ALARM: |
2835 | 0 | r = s->time.callback(s, s->time.next, s->userdata); |
2836 | 0 | break; |
2837 | 0 |
|
2838 | 0 | case SOURCE_SIGNAL: |
2839 | 0 | r = s->signal.callback(s, &s->signal.siginfo, s->userdata); |
2840 | 0 | break; |
2841 | 0 |
|
2842 | 0 | case SOURCE_CHILD: { |
2843 | 0 | bool zombie; |
2844 | 0 |
|
2845 | 0 | zombie = IN_SET(s->child.siginfo.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED); |
2846 | 0 |
|
2847 | 0 | r = s->child.callback(s, &s->child.siginfo, s->userdata); |
2848 | 0 |
|
2849 | 0 | /* Now, reap the PID for good. */ |
2850 | 0 | if (zombie) |
2851 | 0 | (void) waitid(P_PID, s->child.pid, &s->child.siginfo, WNOHANG|WEXITED); |
2852 | 0 |
|
2853 | 0 | break; |
2854 | 0 | } |
2855 | 0 |
|
2856 | 1.60M | case SOURCE_DEFER: |
2857 | 1.60M | r = s->defer.callback(s, s->userdata); |
2858 | 1.60M | break; |
2859 | 0 |
|
2860 | 0 | case SOURCE_POST: |
2861 | 0 | r = s->post.callback(s, s->userdata); |
2862 | 0 | break; |
2863 | 0 |
|
2864 | 963 | case SOURCE_EXIT: |
2865 | 963 | r = s->exit.callback(s, s->userdata); |
2866 | 963 | break; |
2867 | 0 |
|
2868 | 0 | case SOURCE_INOTIFY: { |
2869 | 0 | struct sd_event *e = s->event; |
2870 | 0 | struct inotify_data *d; |
2871 | 0 | size_t sz; |
2872 | 0 |
|
2873 | 0 | assert(s->inotify.inode_data); |
2874 | 0 | assert_se(d = s->inotify.inode_data->inotify_data); |
2875 | 0 |
|
2876 | 0 | assert(d->buffer_filled >= offsetof(struct inotify_event, name)); |
2877 | 0 | sz = offsetof(struct inotify_event, name) + d->buffer.ev.len; |
2878 | 0 | assert(d->buffer_filled >= sz); |
2879 | 0 |
|
2880 | 0 | r = s->inotify.callback(s, &d->buffer.ev, s->userdata); |
2881 | 0 |
|
2882 | 0 | /* When no event is pending anymore on this inotify object, then let's drop the event from the |
2883 | 0 | * buffer. */ |
2884 | 0 | if (d->n_pending == 0) |
2885 | 0 | event_inotify_data_drop(e, d, sz); |
2886 | 0 |
|
2887 | 0 | break; |
2888 | 0 | } |
2889 | 0 |
|
2890 | 0 | case SOURCE_WATCHDOG: |
2891 | 0 | case _SOURCE_EVENT_SOURCE_TYPE_MAX: |
2892 | 0 | case _SOURCE_EVENT_SOURCE_TYPE_INVALID: |
2893 | 0 | assert_not_reached("Wut? I shouldn't exist."); |
2894 | 2.81M | } |
2895 | 2.81M | |
2896 | 2.81M | s->dispatching = false; |
2897 | 2.81M | |
2898 | 2.81M | if (r < 0) |
2899 | 2.81M | log_debug_errno(r, "Event source %s (type %s) returned error, disabling: %m", |
2900 | 2.81M | strna(s->description), event_source_type_to_string(saved_type)); |
2901 | 2.81M | |
2902 | 2.81M | if (s->n_ref == 0) |
2903 | 7.72k | source_free(s); |
2904 | 2.80M | else if (r < 0) |
2905 | 0 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
2906 | 2.81M | |
2907 | 2.81M | return 1; |
2908 | 2.81M | } |
2909 | | |
2910 | 2.81M | static int event_prepare(sd_event *e) { |
2911 | 2.81M | int r; |
2912 | 2.81M | |
2913 | 2.81M | assert(e); |
2914 | 2.81M | |
2915 | 6.34M | for (;;) { |
2916 | 6.34M | sd_event_source *s; |
2917 | 6.34M | |
2918 | 6.34M | s = prioq_peek(e->prepare); |
2919 | 6.34M | if (!s || s->prepare_iteration == e->iteration || s->enabled == SD_EVENT_OFF) |
2920 | 2.81M | break; |
2921 | 3.53M | |
2922 | 3.53M | s->prepare_iteration = e->iteration; |
2923 | 3.53M | r = prioq_reshuffle(e->prepare, s, &s->prepare_index); |
2924 | 3.53M | if (r < 0) |
2925 | 0 | return r; |
2926 | 3.53M | |
2927 | 3.53M | assert(s->prepare); |
2928 | 3.53M | |
2929 | 3.53M | s->dispatching = true; |
2930 | 3.53M | r = s->prepare(s, s->userdata); |
2931 | 3.53M | s->dispatching = false; |
2932 | 3.53M | |
2933 | 3.53M | if (r < 0) |
2934 | 3.53M | log_debug_errno(r, "Prepare callback of event source %s (type %s) returned error, disabling: %m", |
2935 | 3.53M | strna(s->description), event_source_type_to_string(s->type)); |
2936 | 3.53M | |
2937 | 3.53M | if (s->n_ref == 0) |
2938 | 0 | source_free(s); |
2939 | 3.53M | else if (r < 0) |
2940 | 0 | sd_event_source_set_enabled(s, SD_EVENT_OFF); |
2941 | 3.53M | } |
2942 | 2.81M | |
2943 | 2.81M | return 0; |
2944 | 2.81M | } |
2945 | | |
2946 | 4.65k | static int dispatch_exit(sd_event *e) { |
2947 | 4.65k | sd_event_source *p; |
2948 | 4.65k | _cleanup_(sd_event_unrefp) sd_event *ref = NULL; |
2949 | 4.65k | int r; |
2950 | 4.65k | |
2951 | 4.65k | assert(e); |
2952 | 4.65k | |
2953 | 4.65k | p = prioq_peek(e->exit); |
2954 | 4.65k | if (!p || p->enabled == SD_EVENT_OFF) { |
2955 | 3.69k | e->state = SD_EVENT_FINISHED; |
2956 | 3.69k | return 0; |
2957 | 3.69k | } |
2958 | 963 | |
2959 | 963 | ref = sd_event_ref(e); |
2960 | 963 | e->iteration++; |
2961 | 963 | e->state = SD_EVENT_EXITING; |
2962 | 963 | r = source_dispatch(p); |
2963 | 963 | e->state = SD_EVENT_INITIAL; |
2964 | 963 | return r; |
2965 | 963 | } |
2966 | | |
2967 | 8.43M | static sd_event_source* event_next_pending(sd_event *e) { |
2968 | 8.43M | sd_event_source *p; |
2969 | 8.43M | |
2970 | 8.43M | assert(e); |
2971 | 8.43M | |
2972 | 8.43M | p = prioq_peek(e->pending); |
2973 | 8.43M | if (!p) |
2974 | 51.2k | return NULL; |
2975 | 8.38M | |
2976 | 8.38M | if (p->enabled == SD_EVENT_OFF) |
2977 | 0 | return NULL; |
2978 | 8.38M | |
2979 | 8.38M | return p; |
2980 | 8.38M | } |
2981 | | |
2982 | 0 | static int arm_watchdog(sd_event *e) { |
2983 | 0 | struct itimerspec its = {}; |
2984 | 0 | usec_t t; |
2985 | 0 | int r; |
2986 | 0 |
|
2987 | 0 | assert(e); |
2988 | 0 | assert(e->watchdog_fd >= 0); |
2989 | 0 |
|
2990 | 0 | t = sleep_between(e, |
2991 | 0 | e->watchdog_last + (e->watchdog_period / 2), |
2992 | 0 | e->watchdog_last + (e->watchdog_period * 3 / 4)); |
2993 | 0 |
|
2994 | 0 | timespec_store(&its.it_value, t); |
2995 | 0 |
|
2996 | 0 | /* Make sure we never set the watchdog to 0, which tells the |
2997 | 0 | * kernel to disable it. */ |
2998 | 0 | if (its.it_value.tv_sec == 0 && its.it_value.tv_nsec == 0) |
2999 | 0 | its.it_value.tv_nsec = 1; |
3000 | 0 |
|
3001 | 0 | r = timerfd_settime(e->watchdog_fd, TFD_TIMER_ABSTIME, &its, NULL); |
3002 | 0 | if (r < 0) |
3003 | 0 | return -errno; |
3004 | 0 | |
3005 | 0 | return 0; |
3006 | 0 | } |
3007 | | |
3008 | 2.81M | static int process_watchdog(sd_event *e) { |
3009 | 2.81M | assert(e); |
3010 | 2.81M | |
3011 | 2.81M | if (!e->watchdog) |
3012 | 2.81M | return 0; |
3013 | 0 | |
3014 | 0 | /* Don't notify watchdog too often */ |
3015 | 0 | if (e->watchdog_last + e->watchdog_period / 4 > e->timestamp.monotonic) |
3016 | 0 | return 0; |
3017 | 0 | |
3018 | 0 | sd_notify(false, "WATCHDOG=1"); |
3019 | 0 | e->watchdog_last = e->timestamp.monotonic; |
3020 | 0 |
|
3021 | 0 | return arm_watchdog(e); |
3022 | 0 | } |
3023 | | |
3024 | 2.81M | static void event_close_inode_data_fds(sd_event *e) { |
3025 | 2.81M | struct inode_data *d; |
3026 | 2.81M | |
3027 | 2.81M | assert(e); |
3028 | 2.81M | |
3029 | 2.81M | /* Close the fds pointing to the inodes to watch now. We need to close them as they might otherwise pin |
3030 | 2.81M | * filesystems. But we can't close them right-away as we need them as long as the user still wants to make |
3031 | 2.81M | * adjustments to the even source, such as changing the priority (which requires us to remove and re-add a watch |
3032 | 2.81M | * for the inode). Hence, let's close them when entering the first iteration after they were added, as a |
3033 | 2.81M | * compromise. */ |
3034 | 2.81M | |
3035 | 2.81M | while ((d = e->inode_data_to_close)) { |
3036 | 0 | assert(d->fd >= 0); |
3037 | 0 | d->fd = safe_close(d->fd); |
3038 | 0 |
|
3039 | 0 | LIST_REMOVE(to_close, e->inode_data_to_close, d); |
3040 | 0 | } |
3041 | 2.81M | } |
3042 | | |
3043 | 2.81M | _public_ int sd_event_prepare(sd_event *e) { |
3044 | 2.81M | int r; |
3045 | 2.81M | |
3046 | 2.81M | assert_return(e, -EINVAL); |
3047 | 2.81M | assert_return(e = event_resolve(e), -ENOPKG); |
3048 | 2.81M | assert_return(!event_pid_changed(e), -ECHILD); |
3049 | 2.81M | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
3050 | 2.81M | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
3051 | 2.81M | |
3052 | 2.81M | if (e->exit_requested) |
3053 | 4.65k | goto pending; |
3054 | 2.81M | |
3055 | 2.81M | e->iteration++; |
3056 | 2.81M | |
3057 | 2.81M | e->state = SD_EVENT_PREPARING; |
3058 | 2.81M | r = event_prepare(e); |
3059 | 2.81M | e->state = SD_EVENT_INITIAL; |
3060 | 2.81M | if (r < 0) |
3061 | 0 | return r; |
3062 | 2.81M | |
3063 | 2.81M | r = event_arm_timer(e, &e->realtime); |
3064 | 2.81M | if (r < 0) |
3065 | 0 | return r; |
3066 | 2.81M | |
3067 | 2.81M | r = event_arm_timer(e, &e->boottime); |
3068 | 2.81M | if (r < 0) |
3069 | 0 | return r; |
3070 | 2.81M | |
3071 | 2.81M | r = event_arm_timer(e, &e->monotonic); |
3072 | 2.81M | if (r < 0) |
3073 | 0 | return r; |
3074 | 2.81M | |
3075 | 2.81M | r = event_arm_timer(e, &e->realtime_alarm); |
3076 | 2.81M | if (r < 0) |
3077 | 0 | return r; |
3078 | 2.81M | |
3079 | 2.81M | r = event_arm_timer(e, &e->boottime_alarm); |
3080 | 2.81M | if (r < 0) |
3081 | 0 | return r; |
3082 | 2.81M | |
3083 | 2.81M | event_close_inode_data_fds(e); |
3084 | 2.81M | |
3085 | 2.81M | if (event_next_pending(e) || e->need_process_child) |
3086 | 2.75M | goto pending; |
3087 | 51.2k | |
3088 | 51.2k | e->state = SD_EVENT_ARMED; |
3089 | 51.2k | |
3090 | 51.2k | return 0; |
3091 | 2.76M | |
3092 | 2.76M | pending: |
3093 | 2.76M | e->state = SD_EVENT_ARMED; |
3094 | 2.76M | r = sd_event_wait(e, 0); |
3095 | 2.76M | if (r == 0) |
3096 | 0 | e->state = SD_EVENT_ARMED; |
3097 | 2.76M | |
3098 | 2.76M | return r; |
3099 | 51.2k | } |
3100 | | |
3101 | 2.81M | _public_ int sd_event_wait(sd_event *e, uint64_t timeout) { |
3102 | 2.81M | struct epoll_event *ev_queue; |
3103 | 2.81M | unsigned ev_queue_max; |
3104 | 2.81M | int r, m, i; |
3105 | 2.81M | |
3106 | 2.81M | assert_return(e, -EINVAL); |
3107 | 2.81M | assert_return(e = event_resolve(e), -ENOPKG); |
3108 | 2.81M | assert_return(!event_pid_changed(e), -ECHILD); |
3109 | 2.81M | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
3110 | 2.81M | assert_return(e->state == SD_EVENT_ARMED, -EBUSY); |
3111 | 2.81M | |
3112 | 2.81M | if (e->exit_requested) { |
3113 | 4.65k | e->state = SD_EVENT_PENDING; |
3114 | 4.65k | return 1; |
3115 | 4.65k | } |
3116 | 2.81M | |
3117 | 2.81M | ev_queue_max = MAX(e->n_sources, 1u); |
3118 | 5.62M | ev_queue = newa(struct epoll_event, ev_queue_max); |
3119 | 5.62M | |
3120 | 5.62M | /* If we still have inotify data buffered, then query the other fds, but don't wait on it */ |
3121 | 5.62M | if (e->inotify_data_buffered) |
3122 | 0 | timeout = 0; |
3123 | 5.62M | |
3124 | 5.62M | m = epoll_wait(e->epoll_fd, ev_queue, ev_queue_max, |
3125 | 5.62M | timeout == (uint64_t) -1 ? -1 : (int) DIV_ROUND_UP(timeout, USEC_PER_MSEC)); |
3126 | 5.62M | if (m < 0) { |
3127 | 0 | if (errno == EINTR) { |
3128 | 0 | e->state = SD_EVENT_PENDING; |
3129 | 0 | return 1; |
3130 | 0 | } |
3131 | 0 | |
3132 | 0 | r = -errno; |
3133 | 0 | goto finish; |
3134 | 0 | } |
3135 | 2.81M | |
3136 | 2.81M | triple_timestamp_get(&e->timestamp); |
3137 | 2.81M | |
3138 | 7.57M | for (i = 0; i < m; i++) { |
3139 | 4.76M | |
3140 | 4.76M | if (ev_queue[i].data.ptr == INT_TO_PTR(SOURCE_WATCHDOG)) |
3141 | 4.76M | r = flush_timer(e, e->watchdog_fd, ev_queue[i].events, NULL); |
3142 | 4.76M | else { |
3143 | 4.76M | WakeupType *t = ev_queue[i].data.ptr; |
3144 | 4.76M | |
3145 | 4.76M | switch (*t) { |
3146 | 4.76M | |
3147 | 4.76M | case WAKEUP_EVENT_SOURCE: |
3148 | 4.76M | r = process_io(e, ev_queue[i].data.ptr, ev_queue[i].events); |
3149 | 4.76M | break; |
3150 | 4.76M | |
3151 | 4.76M | case WAKEUP_CLOCK_DATA: { |
3152 | 4.50k | struct clock_data *d = ev_queue[i].data.ptr; |
3153 | 4.50k | r = flush_timer(e, d->fd, ev_queue[i].events, &d->next); |
3154 | 4.50k | break; |
3155 | 4.76M | } |
3156 | 4.76M | |
3157 | 4.76M | case WAKEUP_SIGNAL_DATA: |
3158 | 0 | r = process_signal(e, ev_queue[i].data.ptr, ev_queue[i].events); |
3159 | 0 | break; |
3160 | 4.76M | |
3161 | 4.76M | case WAKEUP_INOTIFY_DATA: |
3162 | 0 | r = event_inotify_data_read(e, ev_queue[i].data.ptr, ev_queue[i].events); |
3163 | 0 | break; |
3164 | 4.76M | |
3165 | 4.76M | default: |
3166 | 0 | assert_not_reached("Invalid wake-up pointer"); |
3167 | 4.76M | } |
3168 | 4.76M | } |
3169 | 4.76M | if (r < 0) |
3170 | 0 | goto finish; |
3171 | 4.76M | } |
3172 | 2.81M | |
3173 | 2.81M | r = process_watchdog(e); |
3174 | 2.81M | if (r < 0) |
3175 | 0 | goto finish; |
3176 | 2.81M | |
3177 | 2.81M | r = process_timer(e, e->timestamp.realtime, &e->realtime); |
3178 | 2.81M | if (r < 0) |
3179 | 0 | goto finish; |
3180 | 2.81M | |
3181 | 2.81M | r = process_timer(e, e->timestamp.boottime, &e->boottime); |
3182 | 2.81M | if (r < 0) |
3183 | 0 | goto finish; |
3184 | 2.81M | |
3185 | 2.81M | r = process_timer(e, e->timestamp.monotonic, &e->monotonic); |
3186 | 2.81M | if (r < 0) |
3187 | 0 | goto finish; |
3188 | 2.81M | |
3189 | 2.81M | r = process_timer(e, e->timestamp.realtime, &e->realtime_alarm); |
3190 | 2.81M | if (r < 0) |
3191 | 0 | goto finish; |
3192 | 2.81M | |
3193 | 2.81M | r = process_timer(e, e->timestamp.boottime, &e->boottime_alarm); |
3194 | 2.81M | if (r < 0) |
3195 | 0 | goto finish; |
3196 | 2.81M | |
3197 | 2.81M | if (e->need_process_child) { |
3198 | 0 | r = process_child(e); |
3199 | 0 | if (r < 0) |
3200 | 0 | goto finish; |
3201 | 2.81M | } |
3202 | 2.81M | |
3203 | 2.81M | r = process_inotify(e); |
3204 | 2.81M | if (r < 0) |
3205 | 0 | goto finish; |
3206 | 2.81M | |
3207 | 2.81M | if (event_next_pending(e)) { |
3208 | 2.81M | e->state = SD_EVENT_PENDING; |
3209 | 2.81M | |
3210 | 2.81M | return 1; |
3211 | 2.81M | } |
3212 | 0 | |
3213 | 0 | r = 0; |
3214 | 0 |
|
3215 | 0 | finish: |
3216 | 0 | e->state = SD_EVENT_INITIAL; |
3217 | 0 |
|
3218 | 0 | return r; |
3219 | 0 | } |
3220 | | |
3221 | 2.81M | _public_ int sd_event_dispatch(sd_event *e) { |
3222 | 2.81M | sd_event_source *p; |
3223 | 2.81M | int r; |
3224 | 2.81M | |
3225 | 2.81M | assert_return(e, -EINVAL); |
3226 | 2.81M | assert_return(e = event_resolve(e), -ENOPKG); |
3227 | 2.81M | assert_return(!event_pid_changed(e), -ECHILD); |
3228 | 2.81M | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
3229 | 2.81M | assert_return(e->state == SD_EVENT_PENDING, -EBUSY); |
3230 | 2.81M | |
3231 | 2.81M | if (e->exit_requested) |
3232 | 4.65k | return dispatch_exit(e); |
3233 | 2.81M | |
3234 | 2.81M | p = event_next_pending(e); |
3235 | 2.81M | if (p) { |
3236 | 2.81M | _cleanup_(sd_event_unrefp) sd_event *ref = NULL; |
3237 | 2.81M | |
3238 | 2.81M | ref = sd_event_ref(e); |
3239 | 2.81M | e->state = SD_EVENT_RUNNING; |
3240 | 2.81M | r = source_dispatch(p); |
3241 | 2.81M | e->state = SD_EVENT_INITIAL; |
3242 | 2.81M | return r; |
3243 | 2.81M | } |
3244 | 0 | |
3245 | 0 | e->state = SD_EVENT_INITIAL; |
3246 | 0 |
|
3247 | 0 | return 1; |
3248 | 0 | } |
3249 | | |
3250 | 0 | static void event_log_delays(sd_event *e) { |
3251 | 0 | char b[ELEMENTSOF(e->delays) * DECIMAL_STR_MAX(unsigned) + 1]; |
3252 | 0 | unsigned i; |
3253 | 0 | int o; |
3254 | 0 |
|
3255 | 0 | for (i = o = 0; i < ELEMENTSOF(e->delays); i++) { |
3256 | 0 | o += snprintf(&b[o], sizeof(b) - o, "%u ", e->delays[i]); |
3257 | 0 | e->delays[i] = 0; |
3258 | 0 | } |
3259 | 0 | log_debug("Event loop iterations: %.*s", o, b); |
3260 | 0 | } |
3261 | | |
3262 | 2.81M | _public_ int sd_event_run(sd_event *e, uint64_t timeout) { |
3263 | 2.81M | int r; |
3264 | 2.81M | |
3265 | 2.81M | assert_return(e, -EINVAL); |
3266 | 2.81M | assert_return(e = event_resolve(e), -ENOPKG); |
3267 | 2.81M | assert_return(!event_pid_changed(e), -ECHILD); |
3268 | 2.81M | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
3269 | 2.81M | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
3270 | 2.81M | |
3271 | 2.81M | if (e->profile_delays && e->last_run) { |
3272 | 0 | usec_t this_run; |
3273 | 0 | unsigned l; |
3274 | 0 |
|
3275 | 0 | this_run = now(CLOCK_MONOTONIC); |
3276 | 0 |
|
3277 | 0 | l = u64log2(this_run - e->last_run); |
3278 | 0 | assert(l < sizeof(e->delays)); |
3279 | 0 | e->delays[l]++; |
3280 | 0 |
|
3281 | 0 | if (this_run - e->last_log >= 5*USEC_PER_SEC) { |
3282 | 0 | event_log_delays(e); |
3283 | 0 | e->last_log = this_run; |
3284 | 0 | } |
3285 | 0 | } |
3286 | 2.81M | |
3287 | 2.81M | r = sd_event_prepare(e); |
3288 | 2.81M | if (r == 0) |
3289 | 51.2k | /* There was nothing? Then wait... */ |
3290 | 51.2k | r = sd_event_wait(e, timeout); |
3291 | 2.81M | |
3292 | 2.81M | if (e->profile_delays) |
3293 | 0 | e->last_run = now(CLOCK_MONOTONIC); |
3294 | 2.81M | |
3295 | 2.81M | if (r > 0) { |
3296 | 2.81M | /* There's something now, then let's dispatch it */ |
3297 | 2.81M | r = sd_event_dispatch(e); |
3298 | 2.81M | if (r < 0) |
3299 | 0 | return r; |
3300 | 2.81M | |
3301 | 2.81M | return 1; |
3302 | 2.81M | } |
3303 | 0 | |
3304 | 0 | return r; |
3305 | 0 | } |
3306 | | |
3307 | 3.69k | _public_ int sd_event_loop(sd_event *e) { |
3308 | 3.69k | _cleanup_(sd_event_unrefp) sd_event *ref = NULL; |
3309 | 3.69k | int r; |
3310 | 3.69k | |
3311 | 3.69k | assert_return(e, -EINVAL); |
3312 | 3.69k | assert_return(e = event_resolve(e), -ENOPKG); |
3313 | 3.69k | assert_return(!event_pid_changed(e), -ECHILD); |
3314 | 3.69k | assert_return(e->state == SD_EVENT_INITIAL, -EBUSY); |
3315 | 3.69k | |
3316 | 3.69k | ref = sd_event_ref(e); |
3317 | 3.69k | |
3318 | 2.76M | while (e->state != SD_EVENT_FINISHED) { |
3319 | 2.76M | r = sd_event_run(e, (uint64_t) -1); |
3320 | 2.76M | if (r < 0) |
3321 | 0 | return r; |
3322 | 2.76M | } |
3323 | 3.69k | |
3324 | 3.69k | return e->exit_code; |
3325 | 3.69k | } |
3326 | | |
3327 | 0 | _public_ int sd_event_get_fd(sd_event *e) { |
3328 | 0 |
|
3329 | 0 | assert_return(e, -EINVAL); |
3330 | 0 | assert_return(e = event_resolve(e), -ENOPKG); |
3331 | 0 | assert_return(!event_pid_changed(e), -ECHILD); |
3332 | 0 |
|
3333 | 0 | return e->epoll_fd; |
3334 | 0 | } |
3335 | | |
3336 | 0 | _public_ int sd_event_get_state(sd_event *e) { |
3337 | 0 | assert_return(e, -EINVAL); |
3338 | 0 | assert_return(e = event_resolve(e), -ENOPKG); |
3339 | 0 | assert_return(!event_pid_changed(e), -ECHILD); |
3340 | 0 |
|
3341 | 0 | return e->state; |
3342 | 0 | } |
3343 | | |
3344 | 0 | _public_ int sd_event_get_exit_code(sd_event *e, int *code) { |
3345 | 0 | assert_return(e, -EINVAL); |
3346 | 0 | assert_return(e = event_resolve(e), -ENOPKG); |
3347 | 0 | assert_return(code, -EINVAL); |
3348 | 0 | assert_return(!event_pid_changed(e), -ECHILD); |
3349 | 0 |
|
3350 | 0 | if (!e->exit_requested) |
3351 | 0 | return -ENODATA; |
3352 | 0 | |
3353 | 0 | *code = e->exit_code; |
3354 | 0 | return 0; |
3355 | 0 | } |
3356 | | |
3357 | 3.69k | _public_ int sd_event_exit(sd_event *e, int code) { |
3358 | 3.69k | assert_return(e, -EINVAL); |
3359 | 3.69k | assert_return(e = event_resolve(e), -ENOPKG); |
3360 | 3.69k | assert_return(e->state != SD_EVENT_FINISHED, -ESTALE); |
3361 | 3.69k | assert_return(!event_pid_changed(e), -ECHILD); |
3362 | 3.69k | |
3363 | 3.69k | e->exit_requested = true; |
3364 | 3.69k | e->exit_code = code; |
3365 | 3.69k | |
3366 | 3.69k | return 0; |
3367 | 3.69k | } |
3368 | | |
3369 | 5.15k | _public_ int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec) { |
3370 | 5.15k | assert_return(e, -EINVAL); |
3371 | 5.15k | assert_return(e = event_resolve(e), -ENOPKG); |
3372 | 5.14k | assert_return(usec, -EINVAL); |
3373 | 5.14k | assert_return(!event_pid_changed(e), -ECHILD); |
3374 | 5.14k | |
3375 | 5.14k | if (!TRIPLE_TIMESTAMP_HAS_CLOCK(clock)) |
3376 | 5.14k | return -EOPNOTSUPP; |
3377 | 5.14k | |
3378 | 5.14k | /* Generate a clean error in case CLOCK_BOOTTIME is not available. Note that don't use clock_supported() here, |
3379 | 5.14k | * for a reason: there are systems where CLOCK_BOOTTIME is supported, but CLOCK_BOOTTIME_ALARM is not, but for |
3380 | 5.14k | * the purpose of getting the time this doesn't matter. */ |
3381 | 5.14k | if (IN_SET(clock, CLOCK_BOOTTIME, CLOCK_BOOTTIME_ALARM) && !clock_boottime_supported()) |
3382 | 0 | return -EOPNOTSUPP; |
3383 | 5.14k | |
3384 | 5.14k | if (!triple_timestamp_is_set(&e->timestamp)) { |
3385 | 4.50k | /* Implicitly fall back to now() if we never ran |
3386 | 4.50k | * before and thus have no cached time. */ |
3387 | 4.50k | *usec = now(clock); |
3388 | 4.50k | return 1; |
3389 | 4.50k | } |
3390 | 641 | |
3391 | 641 | *usec = triple_timestamp_by_clock(&e->timestamp, clock); |
3392 | 641 | return 0; |
3393 | 641 | } |
3394 | | |
3395 | 52.6k | _public_ int sd_event_default(sd_event **ret) { |
3396 | 52.6k | sd_event *e = NULL; |
3397 | 52.6k | int r; |
3398 | 52.6k | |
3399 | 52.6k | if (!ret) |
3400 | 0 | return !!default_event; |
3401 | 52.6k | |
3402 | 52.6k | if (default_event) { |
3403 | 0 | *ret = sd_event_ref(default_event); |
3404 | 0 | return 0; |
3405 | 0 | } |
3406 | 52.6k | |
3407 | 52.6k | r = sd_event_new(&e); |
3408 | 52.6k | if (r < 0) |
3409 | 0 | return r; |
3410 | 52.6k | |
3411 | 52.6k | e->default_event_ptr = &default_event; |
3412 | 52.6k | e->tid = gettid(); |
3413 | 52.6k | default_event = e; |
3414 | 52.6k | |
3415 | 52.6k | *ret = e; |
3416 | 52.6k | return 1; |
3417 | 52.6k | } |
3418 | | |
3419 | 0 | _public_ int sd_event_get_tid(sd_event *e, pid_t *tid) { |
3420 | 0 | assert_return(e, -EINVAL); |
3421 | 0 | assert_return(e = event_resolve(e), -ENOPKG); |
3422 | 0 | assert_return(tid, -EINVAL); |
3423 | 0 | assert_return(!event_pid_changed(e), -ECHILD); |
3424 | 0 |
|
3425 | 0 | if (e->tid != 0) { |
3426 | 0 | *tid = e->tid; |
3427 | 0 | return 0; |
3428 | 0 | } |
3429 | 0 | |
3430 | 0 | return -ENXIO; |
3431 | 0 | } |
3432 | | |
3433 | 20.0k | _public_ int sd_event_set_watchdog(sd_event *e, int b) { |
3434 | 20.0k | int r; |
3435 | 20.0k | |
3436 | 20.0k | assert_return(e, -EINVAL); |
3437 | 20.0k | assert_return(e = event_resolve(e), -ENOPKG); |
3438 | 20.0k | assert_return(!event_pid_changed(e), -ECHILD); |
3439 | 20.0k | |
3440 | 20.0k | if (e->watchdog == !!b) |
3441 | 0 | return e->watchdog; |
3442 | 20.0k | |
3443 | 20.0k | if (b) { |
3444 | 20.0k | struct epoll_event ev; |
3445 | 20.0k | |
3446 | 20.0k | r = sd_watchdog_enabled(false, &e->watchdog_period); |
3447 | 20.0k | if (r <= 0) |
3448 | 20.0k | return r; |
3449 | 0 | |
3450 | 0 | /* Issue first ping immediately */ |
3451 | 0 | sd_notify(false, "WATCHDOG=1"); |
3452 | 0 | e->watchdog_last = now(CLOCK_MONOTONIC); |
3453 | 0 |
|
3454 | 0 | e->watchdog_fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC); |
3455 | 0 | if (e->watchdog_fd < 0) |
3456 | 0 | return -errno; |
3457 | 0 | |
3458 | 0 | r = arm_watchdog(e); |
3459 | 0 | if (r < 0) |
3460 | 0 | goto fail; |
3461 | 0 | |
3462 | 0 | ev = (struct epoll_event) { |
3463 | 0 | .events = EPOLLIN, |
3464 | 0 | .data.ptr = INT_TO_PTR(SOURCE_WATCHDOG), |
3465 | 0 | }; |
3466 | 0 |
|
3467 | 0 | r = epoll_ctl(e->epoll_fd, EPOLL_CTL_ADD, e->watchdog_fd, &ev); |
3468 | 0 | if (r < 0) { |
3469 | 0 | r = -errno; |
3470 | 0 | goto fail; |
3471 | 0 | } |
3472 | 0 | |
3473 | 0 | } else { |
3474 | 0 | if (e->watchdog_fd >= 0) { |
3475 | 0 | epoll_ctl(e->epoll_fd, EPOLL_CTL_DEL, e->watchdog_fd, NULL); |
3476 | 0 | e->watchdog_fd = safe_close(e->watchdog_fd); |
3477 | 0 | } |
3478 | 0 | } |
3479 | 20.0k | |
3480 | 20.0k | e->watchdog = !!b; |
3481 | 0 | return e->watchdog; |
3482 | 0 | |
3483 | 0 | fail: |
3484 | 0 | e->watchdog_fd = safe_close(e->watchdog_fd); |
3485 | 0 | return r; |
3486 | 20.0k | } |
3487 | | |
3488 | 0 | _public_ int sd_event_get_watchdog(sd_event *e) { |
3489 | 0 | assert_return(e, -EINVAL); |
3490 | 0 | assert_return(e = event_resolve(e), -ENOPKG); |
3491 | 0 | assert_return(!event_pid_changed(e), -ECHILD); |
3492 | 0 |
|
3493 | 0 | return e->watchdog; |
3494 | 0 | } |
3495 | | |
3496 | 0 | _public_ int sd_event_get_iteration(sd_event *e, uint64_t *ret) { |
3497 | 0 | assert_return(e, -EINVAL); |
3498 | 0 | assert_return(e = event_resolve(e), -ENOPKG); |
3499 | 0 | assert_return(!event_pid_changed(e), -ECHILD); |
3500 | 0 |
|
3501 | 0 | *ret = e->iteration; |
3502 | 0 | return 0; |
3503 | 0 | } |
3504 | | |
3505 | 0 | _public_ int sd_event_source_set_destroy_callback(sd_event_source *s, sd_event_destroy_t callback) { |
3506 | 0 | assert_return(s, -EINVAL); |
3507 | 0 |
|
3508 | 0 | s->destroy_callback = callback; |
3509 | 0 | return 0; |
3510 | 0 | } |
3511 | | |
3512 | 0 | _public_ int sd_event_source_get_destroy_callback(sd_event_source *s, sd_event_destroy_t *ret) { |
3513 | 0 | assert_return(s, -EINVAL); |
3514 | 0 |
|
3515 | 0 | if (ret) |
3516 | 0 | *ret = s->destroy_callback; |
3517 | 0 |
|
3518 | 0 | return !!s->destroy_callback; |
3519 | 0 | } |
3520 | | |
3521 | 0 | _public_ int sd_event_source_get_floating(sd_event_source *s) { |
3522 | 0 | assert_return(s, -EINVAL); |
3523 | 0 |
|
3524 | 0 | return s->floating; |
3525 | 0 | } |
3526 | | |
3527 | 0 | _public_ int sd_event_source_set_floating(sd_event_source *s, int b) { |
3528 | 0 | assert_return(s, -EINVAL); |
3529 | 0 |
|
3530 | 0 | if (s->floating == !!b) |
3531 | 0 | return 0; |
3532 | 0 | |
3533 | 0 | if (!s->event) /* Already disconnected */ |
3534 | 0 | return -ESTALE; |
3535 | 0 | |
3536 | 0 | s->floating = b; |
3537 | 0 |
|
3538 | 0 | if (b) { |
3539 | 0 | sd_event_source_ref(s); |
3540 | 0 | sd_event_unref(s->event); |
3541 | 0 | } else { |
3542 | 0 | sd_event_ref(s->event); |
3543 | 0 | sd_event_source_unref(s); |
3544 | 0 | } |
3545 | 0 |
|
3546 | 0 | return 1; |
3547 | 0 | } |