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1 | /* | |
2 | * fs/timerfd.c | |
3 | * | |
4 | * Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org> | |
5 | * | |
6 | * | |
7 | * Thanks to Thomas Gleixner for code reviews and useful comments. | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/alarmtimer.h> | |
12 | #include <linux/file.h> | |
13 | #include <linux/poll.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/time.h> | |
22 | #include <linux/hrtimer.h> | |
23 | #include <linux/anon_inodes.h> | |
24 | #include <linux/timerfd.h> | |
25 | #include <linux/syscalls.h> | |
26 | #include <linux/compat.h> | |
27 | #include <linux/rcupdate.h> | |
28 | ||
29 | struct timerfd_ctx { | |
30 | union { | |
31 | struct hrtimer tmr; | |
32 | struct alarm alarm; | |
33 | } t; | |
34 | ktime_t tintv; | |
35 | ktime_t moffs; | |
36 | wait_queue_head_t wqh; | |
37 | u64 ticks; | |
38 | int clockid; | |
39 | short unsigned expired; | |
40 | short unsigned settime_flags; /* to show in fdinfo */ | |
41 | struct rcu_head rcu; | |
42 | struct list_head clist; | |
43 | spinlock_t cancel_lock; | |
44 | bool might_cancel; | |
45 | }; | |
46 | ||
47 | static LIST_HEAD(cancel_list); | |
48 | static DEFINE_SPINLOCK(cancel_lock); | |
49 | ||
50 | static inline bool isalarm(struct timerfd_ctx *ctx) | |
51 | { | |
52 | return ctx->clockid == CLOCK_REALTIME_ALARM || | |
53 | ctx->clockid == CLOCK_BOOTTIME_ALARM; | |
54 | } | |
55 | ||
56 | /* | |
57 | * This gets called when the timer event triggers. We set the "expired" | |
58 | * flag, but we do not re-arm the timer (in case it's necessary, | |
59 | * tintv != 0) until the timer is accessed. | |
60 | */ | |
61 | static void timerfd_triggered(struct timerfd_ctx *ctx) | |
62 | { | |
63 | unsigned long flags; | |
64 | ||
65 | spin_lock_irqsave(&ctx->wqh.lock, flags); | |
66 | ctx->expired = 1; | |
67 | ctx->ticks++; | |
68 | wake_up_locked(&ctx->wqh); | |
69 | spin_unlock_irqrestore(&ctx->wqh.lock, flags); | |
70 | } | |
71 | ||
72 | static enum hrtimer_restart timerfd_tmrproc(struct hrtimer *htmr) | |
73 | { | |
74 | struct timerfd_ctx *ctx = container_of(htmr, struct timerfd_ctx, | |
75 | t.tmr); | |
76 | timerfd_triggered(ctx); | |
77 | return HRTIMER_NORESTART; | |
78 | } | |
79 | ||
80 | static enum alarmtimer_restart timerfd_alarmproc(struct alarm *alarm, | |
81 | ktime_t now) | |
82 | { | |
83 | struct timerfd_ctx *ctx = container_of(alarm, struct timerfd_ctx, | |
84 | t.alarm); | |
85 | timerfd_triggered(ctx); | |
86 | return ALARMTIMER_NORESTART; | |
87 | } | |
88 | ||
89 | /* | |
90 | * Called when the clock was set to cancel the timers in the cancel | |
91 | * list. This will wake up processes waiting on these timers. The | |
92 | * wake-up requires ctx->ticks to be non zero, therefore we increment | |
93 | * it before calling wake_up_locked(). | |
94 | */ | |
95 | void timerfd_clock_was_set(void) | |
96 | { | |
97 | ktime_t moffs = ktime_mono_to_real(0); | |
98 | struct timerfd_ctx *ctx; | |
99 | unsigned long flags; | |
100 | ||
101 | rcu_read_lock(); | |
102 | list_for_each_entry_rcu(ctx, &cancel_list, clist) { | |
103 | if (!ctx->might_cancel) | |
104 | continue; | |
105 | spin_lock_irqsave(&ctx->wqh.lock, flags); | |
106 | if (ctx->moffs != moffs) { | |
107 | ctx->moffs = KTIME_MAX; | |
108 | ctx->ticks++; | |
109 | wake_up_locked(&ctx->wqh); | |
110 | } | |
111 | spin_unlock_irqrestore(&ctx->wqh.lock, flags); | |
112 | } | |
113 | rcu_read_unlock(); | |
114 | } | |
115 | ||
116 | static void __timerfd_remove_cancel(struct timerfd_ctx *ctx) | |
117 | { | |
118 | if (ctx->might_cancel) { | |
119 | ctx->might_cancel = false; | |
120 | spin_lock(&cancel_lock); | |
121 | list_del_rcu(&ctx->clist); | |
122 | spin_unlock(&cancel_lock); | |
123 | } | |
124 | } | |
125 | ||
126 | static void timerfd_remove_cancel(struct timerfd_ctx *ctx) | |
127 | { | |
128 | spin_lock(&ctx->cancel_lock); | |
129 | __timerfd_remove_cancel(ctx); | |
130 | spin_unlock(&ctx->cancel_lock); | |
131 | } | |
132 | ||
133 | static bool timerfd_canceled(struct timerfd_ctx *ctx) | |
134 | { | |
135 | if (!ctx->might_cancel || ctx->moffs != KTIME_MAX) | |
136 | return false; | |
137 | ctx->moffs = ktime_mono_to_real(0); | |
138 | return true; | |
139 | } | |
140 | ||
141 | static void timerfd_setup_cancel(struct timerfd_ctx *ctx, int flags) | |
142 | { | |
143 | spin_lock(&ctx->cancel_lock); | |
144 | if ((ctx->clockid == CLOCK_REALTIME || | |
145 | ctx->clockid == CLOCK_REALTIME_ALARM) && | |
146 | (flags & TFD_TIMER_ABSTIME) && (flags & TFD_TIMER_CANCEL_ON_SET)) { | |
147 | if (!ctx->might_cancel) { | |
148 | ctx->might_cancel = true; | |
149 | spin_lock(&cancel_lock); | |
150 | list_add_rcu(&ctx->clist, &cancel_list); | |
151 | spin_unlock(&cancel_lock); | |
152 | } | |
153 | } else { | |
154 | __timerfd_remove_cancel(ctx); | |
155 | } | |
156 | spin_unlock(&ctx->cancel_lock); | |
157 | } | |
158 | ||
159 | static ktime_t timerfd_get_remaining(struct timerfd_ctx *ctx) | |
160 | { | |
161 | ktime_t remaining; | |
162 | ||
163 | if (isalarm(ctx)) | |
164 | remaining = alarm_expires_remaining(&ctx->t.alarm); | |
165 | else | |
166 | remaining = hrtimer_expires_remaining_adjusted(&ctx->t.tmr); | |
167 | ||
168 | return remaining < 0 ? 0: remaining; | |
169 | } | |
170 | ||
171 | static int timerfd_setup(struct timerfd_ctx *ctx, int flags, | |
172 | const struct itimerspec *ktmr) | |
173 | { | |
174 | enum hrtimer_mode htmode; | |
175 | ktime_t texp; | |
176 | int clockid = ctx->clockid; | |
177 | ||
178 | htmode = (flags & TFD_TIMER_ABSTIME) ? | |
179 | HRTIMER_MODE_ABS: HRTIMER_MODE_REL; | |
180 | ||
181 | texp = timespec_to_ktime(ktmr->it_value); | |
182 | ctx->expired = 0; | |
183 | ctx->ticks = 0; | |
184 | ctx->tintv = timespec_to_ktime(ktmr->it_interval); | |
185 | ||
186 | if (isalarm(ctx)) { | |
187 | alarm_init(&ctx->t.alarm, | |
188 | ctx->clockid == CLOCK_REALTIME_ALARM ? | |
189 | ALARM_REALTIME : ALARM_BOOTTIME, | |
190 | timerfd_alarmproc); | |
191 | } else { | |
192 | hrtimer_init(&ctx->t.tmr, clockid, htmode); | |
193 | hrtimer_set_expires(&ctx->t.tmr, texp); | |
194 | ctx->t.tmr.function = timerfd_tmrproc; | |
195 | } | |
196 | ||
197 | if (texp != 0) { | |
198 | if (isalarm(ctx)) { | |
199 | if (flags & TFD_TIMER_ABSTIME) | |
200 | alarm_start(&ctx->t.alarm, texp); | |
201 | else | |
202 | alarm_start_relative(&ctx->t.alarm, texp); | |
203 | } else { | |
204 | hrtimer_start(&ctx->t.tmr, texp, htmode); | |
205 | } | |
206 | ||
207 | if (timerfd_canceled(ctx)) | |
208 | return -ECANCELED; | |
209 | } | |
210 | ||
211 | ctx->settime_flags = flags & TFD_SETTIME_FLAGS; | |
212 | return 0; | |
213 | } | |
214 | ||
215 | static int timerfd_release(struct inode *inode, struct file *file) | |
216 | { | |
217 | struct timerfd_ctx *ctx = file->private_data; | |
218 | ||
219 | timerfd_remove_cancel(ctx); | |
220 | ||
221 | if (isalarm(ctx)) | |
222 | alarm_cancel(&ctx->t.alarm); | |
223 | else | |
224 | hrtimer_cancel(&ctx->t.tmr); | |
225 | kfree_rcu(ctx, rcu); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static unsigned int timerfd_poll(struct file *file, poll_table *wait) | |
230 | { | |
231 | struct timerfd_ctx *ctx = file->private_data; | |
232 | unsigned int events = 0; | |
233 | unsigned long flags; | |
234 | ||
235 | poll_wait(file, &ctx->wqh, wait); | |
236 | ||
237 | spin_lock_irqsave(&ctx->wqh.lock, flags); | |
238 | if (ctx->ticks) | |
239 | events |= POLLIN; | |
240 | spin_unlock_irqrestore(&ctx->wqh.lock, flags); | |
241 | ||
242 | return events; | |
243 | } | |
244 | ||
245 | static ssize_t timerfd_read(struct file *file, char __user *buf, size_t count, | |
246 | loff_t *ppos) | |
247 | { | |
248 | struct timerfd_ctx *ctx = file->private_data; | |
249 | ssize_t res; | |
250 | u64 ticks = 0; | |
251 | ||
252 | if (count < sizeof(ticks)) | |
253 | return -EINVAL; | |
254 | spin_lock_irq(&ctx->wqh.lock); | |
255 | if (file->f_flags & O_NONBLOCK) | |
256 | res = -EAGAIN; | |
257 | else | |
258 | res = wait_event_interruptible_locked_irq(ctx->wqh, ctx->ticks); | |
259 | ||
260 | /* | |
261 | * If clock has changed, we do not care about the | |
262 | * ticks and we do not rearm the timer. Userspace must | |
263 | * reevaluate anyway. | |
264 | */ | |
265 | if (timerfd_canceled(ctx)) { | |
266 | ctx->ticks = 0; | |
267 | ctx->expired = 0; | |
268 | res = -ECANCELED; | |
269 | } | |
270 | ||
271 | if (ctx->ticks) { | |
272 | ticks = ctx->ticks; | |
273 | ||
274 | if (ctx->expired && ctx->tintv) { | |
275 | /* | |
276 | * If tintv != 0, this is a periodic timer that | |
277 | * needs to be re-armed. We avoid doing it in the timer | |
278 | * callback to avoid DoS attacks specifying a very | |
279 | * short timer period. | |
280 | */ | |
281 | if (isalarm(ctx)) { | |
282 | ticks += alarm_forward_now( | |
283 | &ctx->t.alarm, ctx->tintv) - 1; | |
284 | alarm_restart(&ctx->t.alarm); | |
285 | } else { | |
286 | ticks += hrtimer_forward_now(&ctx->t.tmr, | |
287 | ctx->tintv) - 1; | |
288 | hrtimer_restart(&ctx->t.tmr); | |
289 | } | |
290 | } | |
291 | ctx->expired = 0; | |
292 | ctx->ticks = 0; | |
293 | } | |
294 | spin_unlock_irq(&ctx->wqh.lock); | |
295 | if (ticks) | |
296 | res = put_user(ticks, (u64 __user *) buf) ? -EFAULT: sizeof(ticks); | |
297 | return res; | |
298 | } | |
299 | ||
300 | #ifdef CONFIG_PROC_FS | |
301 | static void timerfd_show(struct seq_file *m, struct file *file) | |
302 | { | |
303 | struct timerfd_ctx *ctx = file->private_data; | |
304 | struct itimerspec t; | |
305 | ||
306 | spin_lock_irq(&ctx->wqh.lock); | |
307 | t.it_value = ktime_to_timespec(timerfd_get_remaining(ctx)); | |
308 | t.it_interval = ktime_to_timespec(ctx->tintv); | |
309 | spin_unlock_irq(&ctx->wqh.lock); | |
310 | ||
311 | seq_printf(m, | |
312 | "clockid: %d\n" | |
313 | "ticks: %llu\n" | |
314 | "settime flags: 0%o\n" | |
315 | "it_value: (%llu, %llu)\n" | |
316 | "it_interval: (%llu, %llu)\n", | |
317 | ctx->clockid, | |
318 | (unsigned long long)ctx->ticks, | |
319 | ctx->settime_flags, | |
320 | (unsigned long long)t.it_value.tv_sec, | |
321 | (unsigned long long)t.it_value.tv_nsec, | |
322 | (unsigned long long)t.it_interval.tv_sec, | |
323 | (unsigned long long)t.it_interval.tv_nsec); | |
324 | } | |
325 | #else | |
326 | #define timerfd_show NULL | |
327 | #endif | |
328 | ||
329 | #ifdef CONFIG_CHECKPOINT_RESTORE | |
330 | static long timerfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
331 | { | |
332 | struct timerfd_ctx *ctx = file->private_data; | |
333 | int ret = 0; | |
334 | ||
335 | switch (cmd) { | |
336 | case TFD_IOC_SET_TICKS: { | |
337 | u64 ticks; | |
338 | ||
339 | if (copy_from_user(&ticks, (u64 __user *)arg, sizeof(ticks))) | |
340 | return -EFAULT; | |
341 | if (!ticks) | |
342 | return -EINVAL; | |
343 | ||
344 | spin_lock_irq(&ctx->wqh.lock); | |
345 | if (!timerfd_canceled(ctx)) { | |
346 | ctx->ticks = ticks; | |
347 | wake_up_locked(&ctx->wqh); | |
348 | } else | |
349 | ret = -ECANCELED; | |
350 | spin_unlock_irq(&ctx->wqh.lock); | |
351 | break; | |
352 | } | |
353 | default: | |
354 | ret = -ENOTTY; | |
355 | break; | |
356 | } | |
357 | ||
358 | return ret; | |
359 | } | |
360 | #else | |
361 | #define timerfd_ioctl NULL | |
362 | #endif | |
363 | ||
364 | static const struct file_operations timerfd_fops = { | |
365 | .release = timerfd_release, | |
366 | .poll = timerfd_poll, | |
367 | .read = timerfd_read, | |
368 | .llseek = noop_llseek, | |
369 | .show_fdinfo = timerfd_show, | |
370 | .unlocked_ioctl = timerfd_ioctl, | |
371 | }; | |
372 | ||
373 | static int timerfd_fget(int fd, struct fd *p) | |
374 | { | |
375 | struct fd f = fdget(fd); | |
376 | if (!f.file) | |
377 | return -EBADF; | |
378 | if (f.file->f_op != &timerfd_fops) { | |
379 | fdput(f); | |
380 | return -EINVAL; | |
381 | } | |
382 | *p = f; | |
383 | return 0; | |
384 | } | |
385 | ||
386 | SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags) | |
387 | { | |
388 | int ufd; | |
389 | struct timerfd_ctx *ctx; | |
390 | ||
391 | /* Check the TFD_* constants for consistency. */ | |
392 | BUILD_BUG_ON(TFD_CLOEXEC != O_CLOEXEC); | |
393 | BUILD_BUG_ON(TFD_NONBLOCK != O_NONBLOCK); | |
394 | ||
395 | if ((flags & ~TFD_CREATE_FLAGS) || | |
396 | (clockid != CLOCK_MONOTONIC && | |
397 | clockid != CLOCK_REALTIME && | |
398 | clockid != CLOCK_REALTIME_ALARM && | |
399 | clockid != CLOCK_BOOTTIME && | |
400 | clockid != CLOCK_BOOTTIME_ALARM)) | |
401 | return -EINVAL; | |
402 | ||
403 | if ((clockid == CLOCK_REALTIME_ALARM || | |
404 | clockid == CLOCK_BOOTTIME_ALARM) && | |
405 | !capable(CAP_WAKE_ALARM)) | |
406 | return -EPERM; | |
407 | ||
408 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
409 | if (!ctx) | |
410 | return -ENOMEM; | |
411 | ||
412 | init_waitqueue_head(&ctx->wqh); | |
413 | spin_lock_init(&ctx->cancel_lock); | |
414 | ctx->clockid = clockid; | |
415 | ||
416 | if (isalarm(ctx)) | |
417 | alarm_init(&ctx->t.alarm, | |
418 | ctx->clockid == CLOCK_REALTIME_ALARM ? | |
419 | ALARM_REALTIME : ALARM_BOOTTIME, | |
420 | timerfd_alarmproc); | |
421 | else | |
422 | hrtimer_init(&ctx->t.tmr, clockid, HRTIMER_MODE_ABS); | |
423 | ||
424 | ctx->moffs = ktime_mono_to_real(0); | |
425 | ||
426 | ufd = anon_inode_getfd("[timerfd]", &timerfd_fops, ctx, | |
427 | O_RDWR | (flags & TFD_SHARED_FCNTL_FLAGS)); | |
428 | if (ufd < 0) | |
429 | kfree(ctx); | |
430 | ||
431 | return ufd; | |
432 | } | |
433 | ||
434 | static int do_timerfd_settime(int ufd, int flags, | |
435 | const struct itimerspec *new, | |
436 | struct itimerspec *old) | |
437 | { | |
438 | struct fd f; | |
439 | struct timerfd_ctx *ctx; | |
440 | int ret; | |
441 | ||
442 | if ((flags & ~TFD_SETTIME_FLAGS) || | |
443 | !timespec_valid(&new->it_value) || | |
444 | !timespec_valid(&new->it_interval)) | |
445 | return -EINVAL; | |
446 | ||
447 | ret = timerfd_fget(ufd, &f); | |
448 | if (ret) | |
449 | return ret; | |
450 | ctx = f.file->private_data; | |
451 | ||
452 | if (isalarm(ctx) && !capable(CAP_WAKE_ALARM)) { | |
453 | fdput(f); | |
454 | return -EPERM; | |
455 | } | |
456 | ||
457 | timerfd_setup_cancel(ctx, flags); | |
458 | ||
459 | /* | |
460 | * We need to stop the existing timer before reprogramming | |
461 | * it to the new values. | |
462 | */ | |
463 | for (;;) { | |
464 | spin_lock_irq(&ctx->wqh.lock); | |
465 | ||
466 | if (isalarm(ctx)) { | |
467 | if (alarm_try_to_cancel(&ctx->t.alarm) >= 0) | |
468 | break; | |
469 | } else { | |
470 | if (hrtimer_try_to_cancel(&ctx->t.tmr) >= 0) | |
471 | break; | |
472 | } | |
473 | spin_unlock_irq(&ctx->wqh.lock); | |
474 | cpu_relax(); | |
475 | } | |
476 | ||
477 | /* | |
478 | * If the timer is expired and it's periodic, we need to advance it | |
479 | * because the caller may want to know the previous expiration time. | |
480 | * We do not update "ticks" and "expired" since the timer will be | |
481 | * re-programmed again in the following timerfd_setup() call. | |
482 | */ | |
483 | if (ctx->expired && ctx->tintv) { | |
484 | if (isalarm(ctx)) | |
485 | alarm_forward_now(&ctx->t.alarm, ctx->tintv); | |
486 | else | |
487 | hrtimer_forward_now(&ctx->t.tmr, ctx->tintv); | |
488 | } | |
489 | ||
490 | old->it_value = ktime_to_timespec(timerfd_get_remaining(ctx)); | |
491 | old->it_interval = ktime_to_timespec(ctx->tintv); | |
492 | ||
493 | /* | |
494 | * Re-program the timer to the new value ... | |
495 | */ | |
496 | ret = timerfd_setup(ctx, flags, new); | |
497 | ||
498 | spin_unlock_irq(&ctx->wqh.lock); | |
499 | fdput(f); | |
500 | return ret; | |
501 | } | |
502 | ||
503 | static int do_timerfd_gettime(int ufd, struct itimerspec *t) | |
504 | { | |
505 | struct fd f; | |
506 | struct timerfd_ctx *ctx; | |
507 | int ret = timerfd_fget(ufd, &f); | |
508 | if (ret) | |
509 | return ret; | |
510 | ctx = f.file->private_data; | |
511 | ||
512 | spin_lock_irq(&ctx->wqh.lock); | |
513 | if (ctx->expired && ctx->tintv) { | |
514 | ctx->expired = 0; | |
515 | ||
516 | if (isalarm(ctx)) { | |
517 | ctx->ticks += | |
518 | alarm_forward_now( | |
519 | &ctx->t.alarm, ctx->tintv) - 1; | |
520 | alarm_restart(&ctx->t.alarm); | |
521 | } else { | |
522 | ctx->ticks += | |
523 | hrtimer_forward_now(&ctx->t.tmr, ctx->tintv) | |
524 | - 1; | |
525 | hrtimer_restart(&ctx->t.tmr); | |
526 | } | |
527 | } | |
528 | t->it_value = ktime_to_timespec(timerfd_get_remaining(ctx)); | |
529 | t->it_interval = ktime_to_timespec(ctx->tintv); | |
530 | spin_unlock_irq(&ctx->wqh.lock); | |
531 | fdput(f); | |
532 | return 0; | |
533 | } | |
534 | ||
535 | SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags, | |
536 | const struct itimerspec __user *, utmr, | |
537 | struct itimerspec __user *, otmr) | |
538 | { | |
539 | struct itimerspec new, old; | |
540 | int ret; | |
541 | ||
542 | if (copy_from_user(&new, utmr, sizeof(new))) | |
543 | return -EFAULT; | |
544 | ret = do_timerfd_settime(ufd, flags, &new, &old); | |
545 | if (ret) | |
546 | return ret; | |
547 | if (otmr && copy_to_user(otmr, &old, sizeof(old))) | |
548 | return -EFAULT; | |
549 | ||
550 | return ret; | |
551 | } | |
552 | ||
553 | SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct itimerspec __user *, otmr) | |
554 | { | |
555 | struct itimerspec kotmr; | |
556 | int ret = do_timerfd_gettime(ufd, &kotmr); | |
557 | if (ret) | |
558 | return ret; | |
559 | return copy_to_user(otmr, &kotmr, sizeof(kotmr)) ? -EFAULT: 0; | |
560 | } | |
561 | ||
562 | #ifdef CONFIG_COMPAT | |
563 | COMPAT_SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags, | |
564 | const struct compat_itimerspec __user *, utmr, | |
565 | struct compat_itimerspec __user *, otmr) | |
566 | { | |
567 | struct itimerspec new, old; | |
568 | int ret; | |
569 | ||
570 | if (get_compat_itimerspec(&new, utmr)) | |
571 | return -EFAULT; | |
572 | ret = do_timerfd_settime(ufd, flags, &new, &old); | |
573 | if (ret) | |
574 | return ret; | |
575 | if (otmr && put_compat_itimerspec(otmr, &old)) | |
576 | return -EFAULT; | |
577 | return ret; | |
578 | } | |
579 | ||
580 | COMPAT_SYSCALL_DEFINE2(timerfd_gettime, int, ufd, | |
581 | struct compat_itimerspec __user *, otmr) | |
582 | { | |
583 | struct itimerspec kotmr; | |
584 | int ret = do_timerfd_gettime(ufd, &kotmr); | |
585 | if (ret) | |
586 | return ret; | |
587 | return put_compat_itimerspec(otmr, &kotmr) ? -EFAULT: 0; | |
588 | } | |
589 | #endif |