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1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/kernel/posix-timers.c |
1da177e4 LT |
3 | * |
4 | * | |
5 | * 2002-10-15 Posix Clocks & timers | |
6 | * by George Anzinger george@mvista.com | |
7 | * | |
8 | * Copyright (C) 2002 2003 by MontaVista Software. | |
9 | * | |
10 | * 2004-06-01 Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug. | |
11 | * Copyright (C) 2004 Boris Hu | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or (at | |
16 | * your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, but | |
19 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
21 | * General Public License for more details. | |
22 | ||
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | * | |
27 | * MontaVista Software | 1237 East Arques Avenue | Sunnyvale | CA 94085 | USA | |
28 | */ | |
29 | ||
30 | /* These are all the functions necessary to implement | |
31 | * POSIX clocks & timers | |
32 | */ | |
33 | #include <linux/mm.h> | |
1da177e4 LT |
34 | #include <linux/interrupt.h> |
35 | #include <linux/slab.h> | |
36 | #include <linux/time.h> | |
97d1f15b | 37 | #include <linux/mutex.h> |
1da177e4 LT |
38 | |
39 | #include <asm/uaccess.h> | |
1da177e4 LT |
40 | #include <linux/list.h> |
41 | #include <linux/init.h> | |
42 | #include <linux/compiler.h> | |
43 | #include <linux/idr.h> | |
44 | #include <linux/posix-timers.h> | |
45 | #include <linux/syscalls.h> | |
46 | #include <linux/wait.h> | |
47 | #include <linux/workqueue.h> | |
48 | #include <linux/module.h> | |
49 | ||
1da177e4 LT |
50 | /* |
51 | * Management arrays for POSIX timers. Timers are kept in slab memory | |
52 | * Timer ids are allocated by an external routine that keeps track of the | |
53 | * id and the timer. The external interface is: | |
54 | * | |
55 | * void *idr_find(struct idr *idp, int id); to find timer_id <id> | |
56 | * int idr_get_new(struct idr *idp, void *ptr); to get a new id and | |
57 | * related it to <ptr> | |
58 | * void idr_remove(struct idr *idp, int id); to release <id> | |
59 | * void idr_init(struct idr *idp); to initialize <idp> | |
60 | * which we supply. | |
61 | * The idr_get_new *may* call slab for more memory so it must not be | |
62 | * called under a spin lock. Likewise idr_remore may release memory | |
63 | * (but it may be ok to do this under a lock...). | |
64 | * idr_find is just a memory look up and is quite fast. A -1 return | |
65 | * indicates that the requested id does not exist. | |
66 | */ | |
67 | ||
68 | /* | |
69 | * Lets keep our timers in a slab cache :-) | |
70 | */ | |
e18b890b | 71 | static struct kmem_cache *posix_timers_cache; |
1da177e4 LT |
72 | static struct idr posix_timers_id; |
73 | static DEFINE_SPINLOCK(idr_lock); | |
74 | ||
1da177e4 LT |
75 | /* |
76 | * we assume that the new SIGEV_THREAD_ID shares no bits with the other | |
77 | * SIGEV values. Here we put out an error if this assumption fails. | |
78 | */ | |
79 | #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \ | |
80 | ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD)) | |
81 | #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!" | |
82 | #endif | |
83 | ||
65da528d TG |
84 | /* |
85 | * parisc wants ENOTSUP instead of EOPNOTSUPP | |
86 | */ | |
87 | #ifndef ENOTSUP | |
88 | # define ENANOSLEEP_NOTSUP EOPNOTSUPP | |
89 | #else | |
90 | # define ENANOSLEEP_NOTSUP ENOTSUP | |
91 | #endif | |
1da177e4 LT |
92 | |
93 | /* | |
94 | * The timer ID is turned into a timer address by idr_find(). | |
95 | * Verifying a valid ID consists of: | |
96 | * | |
97 | * a) checking that idr_find() returns other than -1. | |
98 | * b) checking that the timer id matches the one in the timer itself. | |
99 | * c) that the timer owner is in the callers thread group. | |
100 | */ | |
101 | ||
102 | /* | |
103 | * CLOCKs: The POSIX standard calls for a couple of clocks and allows us | |
104 | * to implement others. This structure defines the various | |
105 | * clocks and allows the possibility of adding others. We | |
106 | * provide an interface to add clocks to the table and expect | |
107 | * the "arch" code to add at least one clock that is high | |
108 | * resolution. Here we define the standard CLOCK_REALTIME as a | |
109 | * 1/HZ resolution clock. | |
110 | * | |
111 | * RESOLUTION: Clock resolution is used to round up timer and interval | |
112 | * times, NOT to report clock times, which are reported with as | |
113 | * much resolution as the system can muster. In some cases this | |
114 | * resolution may depend on the underlying clock hardware and | |
115 | * may not be quantifiable until run time, and only then is the | |
116 | * necessary code is written. The standard says we should say | |
117 | * something about this issue in the documentation... | |
118 | * | |
119 | * FUNCTIONS: The CLOCKs structure defines possible functions to handle | |
120 | * various clock functions. For clocks that use the standard | |
121 | * system timer code these entries should be NULL. This will | |
122 | * allow dispatch without the overhead of indirect function | |
123 | * calls. CLOCKS that depend on other sources (e.g. WWV or GPS) | |
124 | * must supply functions here, even if the function just returns | |
125 | * ENOSYS. The standard POSIX timer management code assumes the | |
126 | * following: 1.) The k_itimer struct (sched.h) is used for the | |
27af4245 | 127 | * timer. 2.) The list, it_lock, it_clock, it_id and it_pid |
1da177e4 LT |
128 | * fields are not modified by timer code. |
129 | * | |
130 | * At this time all functions EXCEPT clock_nanosleep can be | |
131 | * redirected by the CLOCKS structure. Clock_nanosleep is in | |
132 | * there, but the code ignores it. | |
133 | * | |
134 | * Permissions: It is assumed that the clock_settime() function defined | |
135 | * for each clock will take care of permission checks. Some | |
136 | * clocks may be set able by any user (i.e. local process | |
137 | * clocks) others not. Currently the only set able clock we | |
138 | * have is CLOCK_REALTIME and its high res counter part, both of | |
139 | * which we beg off on and pass to do_sys_settimeofday(). | |
140 | */ | |
141 | ||
142 | static struct k_clock posix_clocks[MAX_CLOCKS]; | |
becf8b5d | 143 | |
1da177e4 | 144 | /* |
becf8b5d | 145 | * These ones are defined below. |
1da177e4 | 146 | */ |
becf8b5d TG |
147 | static int common_nsleep(const clockid_t, int flags, struct timespec *t, |
148 | struct timespec __user *rmtp); | |
149 | static void common_timer_get(struct k_itimer *, struct itimerspec *); | |
150 | static int common_timer_set(struct k_itimer *, int, | |
151 | struct itimerspec *, struct itimerspec *); | |
152 | static int common_timer_del(struct k_itimer *timer); | |
1da177e4 | 153 | |
c9cb2e3d | 154 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *data); |
1da177e4 | 155 | |
20f33a03 NK |
156 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags); |
157 | ||
158 | #define lock_timer(tid, flags) \ | |
159 | ({ struct k_itimer *__timr; \ | |
160 | __cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \ | |
161 | __timr; \ | |
162 | }) | |
1da177e4 LT |
163 | |
164 | static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) | |
165 | { | |
166 | spin_unlock_irqrestore(&timr->it_lock, flags); | |
167 | } | |
168 | ||
169 | /* | |
170 | * Call the k_clock hook function if non-null, or the default function. | |
171 | */ | |
172 | #define CLOCK_DISPATCH(clock, call, arglist) \ | |
173 | ((clock) < 0 ? posix_cpu_##call arglist : \ | |
174 | (posix_clocks[clock].call != NULL \ | |
175 | ? (*posix_clocks[clock].call) arglist : common_##call arglist)) | |
176 | ||
177 | /* | |
178 | * Default clock hook functions when the struct k_clock passed | |
179 | * to register_posix_clock leaves a function pointer null. | |
180 | * | |
181 | * The function common_CALL is the default implementation for | |
182 | * the function pointer CALL in struct k_clock. | |
183 | */ | |
184 | ||
a924b04d | 185 | static inline int common_clock_getres(const clockid_t which_clock, |
1da177e4 LT |
186 | struct timespec *tp) |
187 | { | |
188 | tp->tv_sec = 0; | |
189 | tp->tv_nsec = posix_clocks[which_clock].res; | |
190 | return 0; | |
191 | } | |
192 | ||
becf8b5d TG |
193 | /* |
194 | * Get real time for posix timers | |
195 | */ | |
196 | static int common_clock_get(clockid_t which_clock, struct timespec *tp) | |
1da177e4 | 197 | { |
becf8b5d | 198 | ktime_get_real_ts(tp); |
1da177e4 LT |
199 | return 0; |
200 | } | |
201 | ||
a924b04d | 202 | static inline int common_clock_set(const clockid_t which_clock, |
1e6d7679 | 203 | const struct timespec *tp) |
1da177e4 LT |
204 | { |
205 | return do_sys_settimeofday(tp, NULL); | |
206 | } | |
207 | ||
858119e1 | 208 | static int common_timer_create(struct k_itimer *new_timer) |
1da177e4 | 209 | { |
7978672c | 210 | hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); |
1da177e4 LT |
211 | return 0; |
212 | } | |
213 | ||
3d44cc3e TG |
214 | static int no_timer_create(struct k_itimer *new_timer) |
215 | { | |
216 | return -EOPNOTSUPP; | |
217 | } | |
218 | ||
70d715fd HS |
219 | static int no_nsleep(const clockid_t which_clock, int flags, |
220 | struct timespec *tsave, struct timespec __user *rmtp) | |
221 | { | |
222 | return -EOPNOTSUPP; | |
223 | } | |
224 | ||
1da177e4 | 225 | /* |
becf8b5d | 226 | * Return nonzero if we know a priori this clockid_t value is bogus. |
1da177e4 | 227 | */ |
a924b04d | 228 | static inline int invalid_clockid(const clockid_t which_clock) |
1da177e4 LT |
229 | { |
230 | if (which_clock < 0) /* CPU clock, posix_cpu_* will check it */ | |
231 | return 0; | |
232 | if ((unsigned) which_clock >= MAX_CLOCKS) | |
233 | return 1; | |
234 | if (posix_clocks[which_clock].clock_getres != NULL) | |
235 | return 0; | |
1da177e4 LT |
236 | if (posix_clocks[which_clock].res != 0) |
237 | return 0; | |
1da177e4 LT |
238 | return 1; |
239 | } | |
240 | ||
becf8b5d TG |
241 | /* |
242 | * Get monotonic time for posix timers | |
243 | */ | |
244 | static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp) | |
245 | { | |
246 | ktime_get_ts(tp); | |
247 | return 0; | |
248 | } | |
1da177e4 | 249 | |
2d42244a JS |
250 | /* |
251 | * Get monotonic time for posix timers | |
252 | */ | |
253 | static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp) | |
254 | { | |
255 | getrawmonotonic(tp); | |
256 | return 0; | |
257 | } | |
258 | ||
da15cfda JS |
259 | |
260 | static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec *tp) | |
261 | { | |
262 | *tp = current_kernel_time(); | |
263 | return 0; | |
264 | } | |
265 | ||
266 | static int posix_get_monotonic_coarse(clockid_t which_clock, | |
267 | struct timespec *tp) | |
268 | { | |
269 | *tp = get_monotonic_coarse(); | |
270 | return 0; | |
271 | } | |
272 | ||
6622e670 | 273 | static int posix_get_coarse_res(const clockid_t which_clock, struct timespec *tp) |
da15cfda JS |
274 | { |
275 | *tp = ktime_to_timespec(KTIME_LOW_RES); | |
276 | return 0; | |
277 | } | |
1da177e4 LT |
278 | /* |
279 | * Initialize everything, well, just everything in Posix clocks/timers ;) | |
280 | */ | |
281 | static __init int init_posix_timers(void) | |
282 | { | |
becf8b5d TG |
283 | struct k_clock clock_realtime = { |
284 | .clock_getres = hrtimer_get_res, | |
1da177e4 | 285 | }; |
becf8b5d TG |
286 | struct k_clock clock_monotonic = { |
287 | .clock_getres = hrtimer_get_res, | |
288 | .clock_get = posix_ktime_get_ts, | |
289 | .clock_set = do_posix_clock_nosettime, | |
1da177e4 | 290 | }; |
2d42244a JS |
291 | struct k_clock clock_monotonic_raw = { |
292 | .clock_getres = hrtimer_get_res, | |
293 | .clock_get = posix_get_monotonic_raw, | |
294 | .clock_set = do_posix_clock_nosettime, | |
3d44cc3e | 295 | .timer_create = no_timer_create, |
70d715fd | 296 | .nsleep = no_nsleep, |
2d42244a | 297 | }; |
da15cfda JS |
298 | struct k_clock clock_realtime_coarse = { |
299 | .clock_getres = posix_get_coarse_res, | |
300 | .clock_get = posix_get_realtime_coarse, | |
301 | .clock_set = do_posix_clock_nosettime, | |
302 | .timer_create = no_timer_create, | |
303 | .nsleep = no_nsleep, | |
304 | }; | |
305 | struct k_clock clock_monotonic_coarse = { | |
306 | .clock_getres = posix_get_coarse_res, | |
307 | .clock_get = posix_get_monotonic_coarse, | |
308 | .clock_set = do_posix_clock_nosettime, | |
309 | .timer_create = no_timer_create, | |
310 | .nsleep = no_nsleep, | |
311 | }; | |
1da177e4 LT |
312 | |
313 | register_posix_clock(CLOCK_REALTIME, &clock_realtime); | |
314 | register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic); | |
2d42244a | 315 | register_posix_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw); |
da15cfda JS |
316 | register_posix_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse); |
317 | register_posix_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse); | |
1da177e4 LT |
318 | |
319 | posix_timers_cache = kmem_cache_create("posix_timers_cache", | |
040b5c6f AD |
320 | sizeof (struct k_itimer), 0, SLAB_PANIC, |
321 | NULL); | |
1da177e4 LT |
322 | idr_init(&posix_timers_id); |
323 | return 0; | |
324 | } | |
325 | ||
326 | __initcall(init_posix_timers); | |
327 | ||
1da177e4 LT |
328 | static void schedule_next_timer(struct k_itimer *timr) |
329 | { | |
44f21475 RZ |
330 | struct hrtimer *timer = &timr->it.real.timer; |
331 | ||
becf8b5d | 332 | if (timr->it.real.interval.tv64 == 0) |
1da177e4 LT |
333 | return; |
334 | ||
4d672e7a DL |
335 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, |
336 | timer->base->get_time(), | |
337 | timr->it.real.interval); | |
44f21475 | 338 | |
1da177e4 LT |
339 | timr->it_overrun_last = timr->it_overrun; |
340 | timr->it_overrun = -1; | |
341 | ++timr->it_requeue_pending; | |
44f21475 | 342 | hrtimer_restart(timer); |
1da177e4 LT |
343 | } |
344 | ||
345 | /* | |
346 | * This function is exported for use by the signal deliver code. It is | |
347 | * called just prior to the info block being released and passes that | |
348 | * block to us. It's function is to update the overrun entry AND to | |
349 | * restart the timer. It should only be called if the timer is to be | |
350 | * restarted (i.e. we have flagged this in the sys_private entry of the | |
351 | * info block). | |
352 | * | |
353 | * To protect aginst the timer going away while the interrupt is queued, | |
354 | * we require that the it_requeue_pending flag be set. | |
355 | */ | |
356 | void do_schedule_next_timer(struct siginfo *info) | |
357 | { | |
358 | struct k_itimer *timr; | |
359 | unsigned long flags; | |
360 | ||
361 | timr = lock_timer(info->si_tid, &flags); | |
362 | ||
becf8b5d TG |
363 | if (timr && timr->it_requeue_pending == info->si_sys_private) { |
364 | if (timr->it_clock < 0) | |
365 | posix_cpu_timer_schedule(timr); | |
366 | else | |
367 | schedule_next_timer(timr); | |
1da177e4 | 368 | |
54da1174 | 369 | info->si_overrun += timr->it_overrun_last; |
becf8b5d TG |
370 | } |
371 | ||
b6557fbc TG |
372 | if (timr) |
373 | unlock_timer(timr, flags); | |
1da177e4 LT |
374 | } |
375 | ||
ba661292 | 376 | int posix_timer_event(struct k_itimer *timr, int si_private) |
1da177e4 | 377 | { |
27af4245 ON |
378 | struct task_struct *task; |
379 | int shared, ret = -1; | |
ba661292 ON |
380 | /* |
381 | * FIXME: if ->sigq is queued we can race with | |
382 | * dequeue_signal()->do_schedule_next_timer(). | |
383 | * | |
384 | * If dequeue_signal() sees the "right" value of | |
385 | * si_sys_private it calls do_schedule_next_timer(). | |
386 | * We re-queue ->sigq and drop ->it_lock(). | |
387 | * do_schedule_next_timer() locks the timer | |
388 | * and re-schedules it while ->sigq is pending. | |
389 | * Not really bad, but not that we want. | |
390 | */ | |
1da177e4 | 391 | timr->sigq->info.si_sys_private = si_private; |
1da177e4 | 392 | |
27af4245 ON |
393 | rcu_read_lock(); |
394 | task = pid_task(timr->it_pid, PIDTYPE_PID); | |
395 | if (task) { | |
396 | shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); | |
397 | ret = send_sigqueue(timr->sigq, task, shared); | |
398 | } | |
399 | rcu_read_unlock(); | |
4aa73611 ON |
400 | /* If we failed to send the signal the timer stops. */ |
401 | return ret > 0; | |
1da177e4 LT |
402 | } |
403 | EXPORT_SYMBOL_GPL(posix_timer_event); | |
404 | ||
405 | /* | |
406 | * This function gets called when a POSIX.1b interval timer expires. It | |
407 | * is used as a callback from the kernel internal timer. The | |
408 | * run_timer_list code ALWAYS calls with interrupts on. | |
409 | ||
410 | * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. | |
411 | */ | |
c9cb2e3d | 412 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) |
1da177e4 | 413 | { |
05cfb614 | 414 | struct k_itimer *timr; |
1da177e4 | 415 | unsigned long flags; |
becf8b5d | 416 | int si_private = 0; |
c9cb2e3d | 417 | enum hrtimer_restart ret = HRTIMER_NORESTART; |
1da177e4 | 418 | |
05cfb614 | 419 | timr = container_of(timer, struct k_itimer, it.real.timer); |
1da177e4 | 420 | spin_lock_irqsave(&timr->it_lock, flags); |
1da177e4 | 421 | |
becf8b5d TG |
422 | if (timr->it.real.interval.tv64 != 0) |
423 | si_private = ++timr->it_requeue_pending; | |
1da177e4 | 424 | |
becf8b5d TG |
425 | if (posix_timer_event(timr, si_private)) { |
426 | /* | |
427 | * signal was not sent because of sig_ignor | |
428 | * we will not get a call back to restart it AND | |
429 | * it should be restarted. | |
430 | */ | |
431 | if (timr->it.real.interval.tv64 != 0) { | |
58229a18 TG |
432 | ktime_t now = hrtimer_cb_get_time(timer); |
433 | ||
434 | /* | |
435 | * FIXME: What we really want, is to stop this | |
436 | * timer completely and restart it in case the | |
437 | * SIG_IGN is removed. This is a non trivial | |
438 | * change which involves sighand locking | |
439 | * (sigh !), which we don't want to do late in | |
440 | * the release cycle. | |
441 | * | |
442 | * For now we just let timers with an interval | |
443 | * less than a jiffie expire every jiffie to | |
444 | * avoid softirq starvation in case of SIG_IGN | |
445 | * and a very small interval, which would put | |
446 | * the timer right back on the softirq pending | |
447 | * list. By moving now ahead of time we trick | |
448 | * hrtimer_forward() to expire the timer | |
449 | * later, while we still maintain the overrun | |
450 | * accuracy, but have some inconsistency in | |
451 | * the timer_gettime() case. This is at least | |
452 | * better than a starved softirq. A more | |
453 | * complex fix which solves also another related | |
454 | * inconsistency is already in the pipeline. | |
455 | */ | |
456 | #ifdef CONFIG_HIGH_RES_TIMERS | |
457 | { | |
458 | ktime_t kj = ktime_set(0, NSEC_PER_SEC / HZ); | |
459 | ||
460 | if (timr->it.real.interval.tv64 < kj.tv64) | |
461 | now = ktime_add(now, kj); | |
462 | } | |
463 | #endif | |
4d672e7a | 464 | timr->it_overrun += (unsigned int) |
58229a18 | 465 | hrtimer_forward(timer, now, |
becf8b5d TG |
466 | timr->it.real.interval); |
467 | ret = HRTIMER_RESTART; | |
a0a0c28c | 468 | ++timr->it_requeue_pending; |
1da177e4 | 469 | } |
1da177e4 | 470 | } |
1da177e4 | 471 | |
becf8b5d TG |
472 | unlock_timer(timr, flags); |
473 | return ret; | |
474 | } | |
1da177e4 | 475 | |
27af4245 | 476 | static struct pid *good_sigevent(sigevent_t * event) |
1da177e4 LT |
477 | { |
478 | struct task_struct *rtn = current->group_leader; | |
479 | ||
480 | if ((event->sigev_notify & SIGEV_THREAD_ID ) && | |
8dc86af0 | 481 | (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) || |
bac0abd6 | 482 | !same_thread_group(rtn, current) || |
1da177e4 LT |
483 | (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL)) |
484 | return NULL; | |
485 | ||
486 | if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && | |
487 | ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) | |
488 | return NULL; | |
489 | ||
27af4245 | 490 | return task_pid(rtn); |
1da177e4 LT |
491 | } |
492 | ||
a924b04d | 493 | void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock) |
1da177e4 LT |
494 | { |
495 | if ((unsigned) clock_id >= MAX_CLOCKS) { | |
496 | printk("POSIX clock register failed for clock_id %d\n", | |
497 | clock_id); | |
498 | return; | |
499 | } | |
500 | ||
501 | posix_clocks[clock_id] = *new_clock; | |
502 | } | |
503 | EXPORT_SYMBOL_GPL(register_posix_clock); | |
504 | ||
505 | static struct k_itimer * alloc_posix_timer(void) | |
506 | { | |
507 | struct k_itimer *tmr; | |
c3762229 | 508 | tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); |
1da177e4 LT |
509 | if (!tmr) |
510 | return tmr; | |
1da177e4 LT |
511 | if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { |
512 | kmem_cache_free(posix_timers_cache, tmr); | |
aa94fbd5 | 513 | return NULL; |
1da177e4 | 514 | } |
ba661292 | 515 | memset(&tmr->sigq->info, 0, sizeof(siginfo_t)); |
1da177e4 LT |
516 | return tmr; |
517 | } | |
518 | ||
519 | #define IT_ID_SET 1 | |
520 | #define IT_ID_NOT_SET 0 | |
521 | static void release_posix_timer(struct k_itimer *tmr, int it_id_set) | |
522 | { | |
523 | if (it_id_set) { | |
524 | unsigned long flags; | |
525 | spin_lock_irqsave(&idr_lock, flags); | |
526 | idr_remove(&posix_timers_id, tmr->it_id); | |
527 | spin_unlock_irqrestore(&idr_lock, flags); | |
528 | } | |
89992102 | 529 | put_pid(tmr->it_pid); |
1da177e4 | 530 | sigqueue_free(tmr->sigq); |
1da177e4 LT |
531 | kmem_cache_free(posix_timers_cache, tmr); |
532 | } | |
533 | ||
534 | /* Create a POSIX.1b interval timer. */ | |
535 | ||
362e9c07 HC |
536 | SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, |
537 | struct sigevent __user *, timer_event_spec, | |
538 | timer_t __user *, created_timer_id) | |
1da177e4 | 539 | { |
2cd499e3 | 540 | struct k_itimer *new_timer; |
ef864c95 | 541 | int error, new_timer_id; |
1da177e4 LT |
542 | sigevent_t event; |
543 | int it_id_set = IT_ID_NOT_SET; | |
544 | ||
545 | if (invalid_clockid(which_clock)) | |
546 | return -EINVAL; | |
547 | ||
548 | new_timer = alloc_posix_timer(); | |
549 | if (unlikely(!new_timer)) | |
550 | return -EAGAIN; | |
551 | ||
552 | spin_lock_init(&new_timer->it_lock); | |
553 | retry: | |
554 | if (unlikely(!idr_pre_get(&posix_timers_id, GFP_KERNEL))) { | |
555 | error = -EAGAIN; | |
556 | goto out; | |
557 | } | |
558 | spin_lock_irq(&idr_lock); | |
5a51b713 | 559 | error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id); |
1da177e4 | 560 | spin_unlock_irq(&idr_lock); |
ef864c95 ON |
561 | if (error) { |
562 | if (error == -EAGAIN) | |
563 | goto retry; | |
1da177e4 | 564 | /* |
0b0a3e7b | 565 | * Weird looking, but we return EAGAIN if the IDR is |
1da177e4 LT |
566 | * full (proper POSIX return value for this) |
567 | */ | |
568 | error = -EAGAIN; | |
569 | goto out; | |
570 | } | |
571 | ||
572 | it_id_set = IT_ID_SET; | |
573 | new_timer->it_id = (timer_t) new_timer_id; | |
574 | new_timer->it_clock = which_clock; | |
575 | new_timer->it_overrun = -1; | |
1da177e4 | 576 | |
1da177e4 LT |
577 | if (timer_event_spec) { |
578 | if (copy_from_user(&event, timer_event_spec, sizeof (event))) { | |
579 | error = -EFAULT; | |
580 | goto out; | |
581 | } | |
36b2f046 | 582 | rcu_read_lock(); |
89992102 | 583 | new_timer->it_pid = get_pid(good_sigevent(&event)); |
36b2f046 | 584 | rcu_read_unlock(); |
89992102 | 585 | if (!new_timer->it_pid) { |
1da177e4 LT |
586 | error = -EINVAL; |
587 | goto out; | |
588 | } | |
589 | } else { | |
5a9fa730 ON |
590 | event.sigev_notify = SIGEV_SIGNAL; |
591 | event.sigev_signo = SIGALRM; | |
592 | event.sigev_value.sival_int = new_timer->it_id; | |
89992102 | 593 | new_timer->it_pid = get_pid(task_tgid(current)); |
1da177e4 LT |
594 | } |
595 | ||
5a9fa730 ON |
596 | new_timer->it_sigev_notify = event.sigev_notify; |
597 | new_timer->sigq->info.si_signo = event.sigev_signo; | |
598 | new_timer->sigq->info.si_value = event.sigev_value; | |
717835d9 | 599 | new_timer->sigq->info.si_tid = new_timer->it_id; |
5a9fa730 | 600 | new_timer->sigq->info.si_code = SI_TIMER; |
717835d9 | 601 | |
2b08de00 AV |
602 | if (copy_to_user(created_timer_id, |
603 | &new_timer_id, sizeof (new_timer_id))) { | |
604 | error = -EFAULT; | |
605 | goto out; | |
606 | } | |
607 | ||
45e0fffc AV |
608 | error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer)); |
609 | if (error) | |
610 | goto out; | |
611 | ||
36b2f046 | 612 | spin_lock_irq(¤t->sighand->siglock); |
27af4245 | 613 | new_timer->it_signal = current->signal; |
36b2f046 ON |
614 | list_add(&new_timer->list, ¤t->signal->posix_timers); |
615 | spin_unlock_irq(¤t->sighand->siglock); | |
ef864c95 ON |
616 | |
617 | return 0; | |
1da177e4 LT |
618 | /* |
619 | * In the case of the timer belonging to another task, after | |
620 | * the task is unlocked, the timer is owned by the other task | |
621 | * and may cease to exist at any time. Don't use or modify | |
622 | * new_timer after the unlock call. | |
623 | */ | |
1da177e4 | 624 | out: |
ef864c95 | 625 | release_posix_timer(new_timer, it_id_set); |
1da177e4 LT |
626 | return error; |
627 | } | |
628 | ||
1da177e4 LT |
629 | /* |
630 | * Locking issues: We need to protect the result of the id look up until | |
631 | * we get the timer locked down so it is not deleted under us. The | |
632 | * removal is done under the idr spinlock so we use that here to bridge | |
633 | * the find to the timer lock. To avoid a dead lock, the timer id MUST | |
634 | * be release with out holding the timer lock. | |
635 | */ | |
20f33a03 | 636 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags) |
1da177e4 LT |
637 | { |
638 | struct k_itimer *timr; | |
639 | /* | |
640 | * Watch out here. We do a irqsave on the idr_lock and pass the | |
641 | * flags part over to the timer lock. Must not let interrupts in | |
642 | * while we are moving the lock. | |
643 | */ | |
1da177e4 | 644 | spin_lock_irqsave(&idr_lock, *flags); |
31d92845 | 645 | timr = idr_find(&posix_timers_id, (int)timer_id); |
1da177e4 LT |
646 | if (timr) { |
647 | spin_lock(&timr->it_lock); | |
89992102 | 648 | if (timr->it_signal == current->signal) { |
179394af | 649 | spin_unlock(&idr_lock); |
31d92845 ON |
650 | return timr; |
651 | } | |
652 | spin_unlock(&timr->it_lock); | |
653 | } | |
654 | spin_unlock_irqrestore(&idr_lock, *flags); | |
1da177e4 | 655 | |
31d92845 | 656 | return NULL; |
1da177e4 LT |
657 | } |
658 | ||
659 | /* | |
660 | * Get the time remaining on a POSIX.1b interval timer. This function | |
661 | * is ALWAYS called with spin_lock_irq on the timer, thus it must not | |
662 | * mess with irq. | |
663 | * | |
664 | * We have a couple of messes to clean up here. First there is the case | |
665 | * of a timer that has a requeue pending. These timers should appear to | |
666 | * be in the timer list with an expiry as if we were to requeue them | |
667 | * now. | |
668 | * | |
669 | * The second issue is the SIGEV_NONE timer which may be active but is | |
670 | * not really ever put in the timer list (to save system resources). | |
671 | * This timer may be expired, and if so, we will do it here. Otherwise | |
672 | * it is the same as a requeue pending timer WRT to what we should | |
673 | * report. | |
674 | */ | |
675 | static void | |
676 | common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting) | |
677 | { | |
3b98a532 | 678 | ktime_t now, remaining, iv; |
becf8b5d | 679 | struct hrtimer *timer = &timr->it.real.timer; |
1da177e4 | 680 | |
becf8b5d | 681 | memset(cur_setting, 0, sizeof(struct itimerspec)); |
becf8b5d | 682 | |
3b98a532 RZ |
683 | iv = timr->it.real.interval; |
684 | ||
becf8b5d | 685 | /* interval timer ? */ |
3b98a532 RZ |
686 | if (iv.tv64) |
687 | cur_setting->it_interval = ktime_to_timespec(iv); | |
688 | else if (!hrtimer_active(timer) && | |
689 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) | |
becf8b5d | 690 | return; |
3b98a532 RZ |
691 | |
692 | now = timer->base->get_time(); | |
693 | ||
becf8b5d | 694 | /* |
3b98a532 RZ |
695 | * When a requeue is pending or this is a SIGEV_NONE |
696 | * timer move the expiry time forward by intervals, so | |
697 | * expiry is > now. | |
becf8b5d | 698 | */ |
3b98a532 RZ |
699 | if (iv.tv64 && (timr->it_requeue_pending & REQUEUE_PENDING || |
700 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) | |
4d672e7a | 701 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv); |
3b98a532 | 702 | |
cc584b21 | 703 | remaining = ktime_sub(hrtimer_get_expires(timer), now); |
becf8b5d | 704 | /* Return 0 only, when the timer is expired and not pending */ |
3b98a532 RZ |
705 | if (remaining.tv64 <= 0) { |
706 | /* | |
707 | * A single shot SIGEV_NONE timer must return 0, when | |
708 | * it is expired ! | |
709 | */ | |
710 | if ((timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) | |
711 | cur_setting->it_value.tv_nsec = 1; | |
712 | } else | |
becf8b5d | 713 | cur_setting->it_value = ktime_to_timespec(remaining); |
1da177e4 LT |
714 | } |
715 | ||
716 | /* Get the time remaining on a POSIX.1b interval timer. */ | |
362e9c07 HC |
717 | SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, |
718 | struct itimerspec __user *, setting) | |
1da177e4 LT |
719 | { |
720 | struct k_itimer *timr; | |
721 | struct itimerspec cur_setting; | |
722 | unsigned long flags; | |
723 | ||
724 | timr = lock_timer(timer_id, &flags); | |
725 | if (!timr) | |
726 | return -EINVAL; | |
727 | ||
728 | CLOCK_DISPATCH(timr->it_clock, timer_get, (timr, &cur_setting)); | |
729 | ||
730 | unlock_timer(timr, flags); | |
731 | ||
732 | if (copy_to_user(setting, &cur_setting, sizeof (cur_setting))) | |
733 | return -EFAULT; | |
734 | ||
735 | return 0; | |
736 | } | |
becf8b5d | 737 | |
1da177e4 LT |
738 | /* |
739 | * Get the number of overruns of a POSIX.1b interval timer. This is to | |
740 | * be the overrun of the timer last delivered. At the same time we are | |
741 | * accumulating overruns on the next timer. The overrun is frozen when | |
742 | * the signal is delivered, either at the notify time (if the info block | |
743 | * is not queued) or at the actual delivery time (as we are informed by | |
744 | * the call back to do_schedule_next_timer(). So all we need to do is | |
745 | * to pick up the frozen overrun. | |
746 | */ | |
362e9c07 | 747 | SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) |
1da177e4 LT |
748 | { |
749 | struct k_itimer *timr; | |
750 | int overrun; | |
5ba25331 | 751 | unsigned long flags; |
1da177e4 LT |
752 | |
753 | timr = lock_timer(timer_id, &flags); | |
754 | if (!timr) | |
755 | return -EINVAL; | |
756 | ||
757 | overrun = timr->it_overrun_last; | |
758 | unlock_timer(timr, flags); | |
759 | ||
760 | return overrun; | |
761 | } | |
1da177e4 LT |
762 | |
763 | /* Set a POSIX.1b interval timer. */ | |
764 | /* timr->it_lock is taken. */ | |
858119e1 | 765 | static int |
1da177e4 LT |
766 | common_timer_set(struct k_itimer *timr, int flags, |
767 | struct itimerspec *new_setting, struct itimerspec *old_setting) | |
768 | { | |
becf8b5d | 769 | struct hrtimer *timer = &timr->it.real.timer; |
7978672c | 770 | enum hrtimer_mode mode; |
1da177e4 LT |
771 | |
772 | if (old_setting) | |
773 | common_timer_get(timr, old_setting); | |
774 | ||
775 | /* disable the timer */ | |
becf8b5d | 776 | timr->it.real.interval.tv64 = 0; |
1da177e4 LT |
777 | /* |
778 | * careful here. If smp we could be in the "fire" routine which will | |
779 | * be spinning as we hold the lock. But this is ONLY an SMP issue. | |
780 | */ | |
becf8b5d | 781 | if (hrtimer_try_to_cancel(timer) < 0) |
1da177e4 | 782 | return TIMER_RETRY; |
1da177e4 LT |
783 | |
784 | timr->it_requeue_pending = (timr->it_requeue_pending + 2) & | |
785 | ~REQUEUE_PENDING; | |
786 | timr->it_overrun_last = 0; | |
1da177e4 | 787 | |
becf8b5d TG |
788 | /* switch off the timer when it_value is zero */ |
789 | if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) | |
790 | return 0; | |
1da177e4 | 791 | |
c9cb2e3d | 792 | mode = flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; |
7978672c | 793 | hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); |
7978672c | 794 | timr->it.real.timer.function = posix_timer_fn; |
becf8b5d | 795 | |
cc584b21 | 796 | hrtimer_set_expires(timer, timespec_to_ktime(new_setting->it_value)); |
becf8b5d TG |
797 | |
798 | /* Convert interval */ | |
799 | timr->it.real.interval = timespec_to_ktime(new_setting->it_interval); | |
800 | ||
801 | /* SIGEV_NONE timers are not queued ! See common_timer_get */ | |
952bbc87 TG |
802 | if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) { |
803 | /* Setup correct expiry time for relative timers */ | |
5a7780e7 | 804 | if (mode == HRTIMER_MODE_REL) { |
cc584b21 | 805 | hrtimer_add_expires(timer, timer->base->get_time()); |
5a7780e7 | 806 | } |
becf8b5d | 807 | return 0; |
952bbc87 | 808 | } |
becf8b5d | 809 | |
cc584b21 | 810 | hrtimer_start_expires(timer, mode); |
1da177e4 LT |
811 | return 0; |
812 | } | |
813 | ||
814 | /* Set a POSIX.1b interval timer */ | |
362e9c07 HC |
815 | SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, |
816 | const struct itimerspec __user *, new_setting, | |
817 | struct itimerspec __user *, old_setting) | |
1da177e4 LT |
818 | { |
819 | struct k_itimer *timr; | |
820 | struct itimerspec new_spec, old_spec; | |
821 | int error = 0; | |
5ba25331 | 822 | unsigned long flag; |
1da177e4 LT |
823 | struct itimerspec *rtn = old_setting ? &old_spec : NULL; |
824 | ||
825 | if (!new_setting) | |
826 | return -EINVAL; | |
827 | ||
828 | if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) | |
829 | return -EFAULT; | |
830 | ||
becf8b5d TG |
831 | if (!timespec_valid(&new_spec.it_interval) || |
832 | !timespec_valid(&new_spec.it_value)) | |
1da177e4 LT |
833 | return -EINVAL; |
834 | retry: | |
835 | timr = lock_timer(timer_id, &flag); | |
836 | if (!timr) | |
837 | return -EINVAL; | |
838 | ||
839 | error = CLOCK_DISPATCH(timr->it_clock, timer_set, | |
840 | (timr, flags, &new_spec, rtn)); | |
841 | ||
842 | unlock_timer(timr, flag); | |
843 | if (error == TIMER_RETRY) { | |
844 | rtn = NULL; // We already got the old time... | |
845 | goto retry; | |
846 | } | |
847 | ||
becf8b5d TG |
848 | if (old_setting && !error && |
849 | copy_to_user(old_setting, &old_spec, sizeof (old_spec))) | |
1da177e4 LT |
850 | error = -EFAULT; |
851 | ||
852 | return error; | |
853 | } | |
854 | ||
855 | static inline int common_timer_del(struct k_itimer *timer) | |
856 | { | |
becf8b5d | 857 | timer->it.real.interval.tv64 = 0; |
f972be33 | 858 | |
becf8b5d | 859 | if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0) |
1da177e4 | 860 | return TIMER_RETRY; |
1da177e4 LT |
861 | return 0; |
862 | } | |
863 | ||
864 | static inline int timer_delete_hook(struct k_itimer *timer) | |
865 | { | |
866 | return CLOCK_DISPATCH(timer->it_clock, timer_del, (timer)); | |
867 | } | |
868 | ||
869 | /* Delete a POSIX.1b interval timer. */ | |
362e9c07 | 870 | SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) |
1da177e4 LT |
871 | { |
872 | struct k_itimer *timer; | |
5ba25331 | 873 | unsigned long flags; |
1da177e4 | 874 | |
1da177e4 | 875 | retry_delete: |
1da177e4 LT |
876 | timer = lock_timer(timer_id, &flags); |
877 | if (!timer) | |
878 | return -EINVAL; | |
879 | ||
becf8b5d | 880 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
881 | unlock_timer(timer, flags); |
882 | goto retry_delete; | |
883 | } | |
becf8b5d | 884 | |
1da177e4 LT |
885 | spin_lock(¤t->sighand->siglock); |
886 | list_del(&timer->list); | |
887 | spin_unlock(¤t->sighand->siglock); | |
888 | /* | |
889 | * This keeps any tasks waiting on the spin lock from thinking | |
890 | * they got something (see the lock code above). | |
891 | */ | |
89992102 | 892 | timer->it_signal = NULL; |
4b7a1304 | 893 | |
1da177e4 LT |
894 | unlock_timer(timer, flags); |
895 | release_posix_timer(timer, IT_ID_SET); | |
896 | return 0; | |
897 | } | |
becf8b5d | 898 | |
1da177e4 LT |
899 | /* |
900 | * return timer owned by the process, used by exit_itimers | |
901 | */ | |
858119e1 | 902 | static void itimer_delete(struct k_itimer *timer) |
1da177e4 LT |
903 | { |
904 | unsigned long flags; | |
905 | ||
1da177e4 | 906 | retry_delete: |
1da177e4 LT |
907 | spin_lock_irqsave(&timer->it_lock, flags); |
908 | ||
becf8b5d | 909 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
910 | unlock_timer(timer, flags); |
911 | goto retry_delete; | |
912 | } | |
1da177e4 LT |
913 | list_del(&timer->list); |
914 | /* | |
915 | * This keeps any tasks waiting on the spin lock from thinking | |
916 | * they got something (see the lock code above). | |
917 | */ | |
89992102 | 918 | timer->it_signal = NULL; |
4b7a1304 | 919 | |
1da177e4 LT |
920 | unlock_timer(timer, flags); |
921 | release_posix_timer(timer, IT_ID_SET); | |
922 | } | |
923 | ||
924 | /* | |
25f407f0 | 925 | * This is called by do_exit or de_thread, only when there are no more |
1da177e4 LT |
926 | * references to the shared signal_struct. |
927 | */ | |
928 | void exit_itimers(struct signal_struct *sig) | |
929 | { | |
930 | struct k_itimer *tmr; | |
931 | ||
932 | while (!list_empty(&sig->posix_timers)) { | |
933 | tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); | |
934 | itimer_delete(tmr); | |
935 | } | |
936 | } | |
937 | ||
becf8b5d | 938 | /* Not available / possible... functions */ |
1e6d7679 | 939 | int do_posix_clock_nosettime(const clockid_t clockid, const struct timespec *tp) |
1da177e4 LT |
940 | { |
941 | return -EINVAL; | |
942 | } | |
943 | EXPORT_SYMBOL_GPL(do_posix_clock_nosettime); | |
944 | ||
a924b04d | 945 | int do_posix_clock_nonanosleep(const clockid_t clock, int flags, |
97735f25 | 946 | struct timespec *t, struct timespec __user *r) |
1da177e4 | 947 | { |
65da528d | 948 | return -ENANOSLEEP_NOTSUP; |
1da177e4 LT |
949 | } |
950 | EXPORT_SYMBOL_GPL(do_posix_clock_nonanosleep); | |
951 | ||
362e9c07 HC |
952 | SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, |
953 | const struct timespec __user *, tp) | |
1da177e4 LT |
954 | { |
955 | struct timespec new_tp; | |
956 | ||
957 | if (invalid_clockid(which_clock)) | |
958 | return -EINVAL; | |
959 | if (copy_from_user(&new_tp, tp, sizeof (*tp))) | |
960 | return -EFAULT; | |
961 | ||
962 | return CLOCK_DISPATCH(which_clock, clock_set, (which_clock, &new_tp)); | |
963 | } | |
964 | ||
362e9c07 HC |
965 | SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, |
966 | struct timespec __user *,tp) | |
1da177e4 LT |
967 | { |
968 | struct timespec kernel_tp; | |
969 | int error; | |
970 | ||
971 | if (invalid_clockid(which_clock)) | |
972 | return -EINVAL; | |
973 | error = CLOCK_DISPATCH(which_clock, clock_get, | |
974 | (which_clock, &kernel_tp)); | |
975 | if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp))) | |
976 | error = -EFAULT; | |
977 | ||
978 | return error; | |
979 | ||
980 | } | |
981 | ||
362e9c07 HC |
982 | SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, |
983 | struct timespec __user *, tp) | |
1da177e4 LT |
984 | { |
985 | struct timespec rtn_tp; | |
986 | int error; | |
987 | ||
988 | if (invalid_clockid(which_clock)) | |
989 | return -EINVAL; | |
990 | ||
991 | error = CLOCK_DISPATCH(which_clock, clock_getres, | |
992 | (which_clock, &rtn_tp)); | |
993 | ||
994 | if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) { | |
995 | error = -EFAULT; | |
996 | } | |
997 | ||
998 | return error; | |
999 | } | |
1000 | ||
97735f25 TG |
1001 | /* |
1002 | * nanosleep for monotonic and realtime clocks | |
1003 | */ | |
1004 | static int common_nsleep(const clockid_t which_clock, int flags, | |
1005 | struct timespec *tsave, struct timespec __user *rmtp) | |
1006 | { | |
080344b9 ON |
1007 | return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ? |
1008 | HRTIMER_MODE_ABS : HRTIMER_MODE_REL, | |
1009 | which_clock); | |
97735f25 | 1010 | } |
1da177e4 | 1011 | |
362e9c07 HC |
1012 | SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, |
1013 | const struct timespec __user *, rqtp, | |
1014 | struct timespec __user *, rmtp) | |
1da177e4 LT |
1015 | { |
1016 | struct timespec t; | |
1da177e4 LT |
1017 | |
1018 | if (invalid_clockid(which_clock)) | |
1019 | return -EINVAL; | |
1020 | ||
1021 | if (copy_from_user(&t, rqtp, sizeof (struct timespec))) | |
1022 | return -EFAULT; | |
1023 | ||
5f82b2b7 | 1024 | if (!timespec_valid(&t)) |
1da177e4 LT |
1025 | return -EINVAL; |
1026 | ||
97735f25 TG |
1027 | return CLOCK_DISPATCH(which_clock, nsleep, |
1028 | (which_clock, flags, &t, rmtp)); | |
1da177e4 | 1029 | } |
1711ef38 TA |
1030 | |
1031 | /* | |
1032 | * nanosleep_restart for monotonic and realtime clocks | |
1033 | */ | |
1034 | static int common_nsleep_restart(struct restart_block *restart_block) | |
1035 | { | |
1036 | return hrtimer_nanosleep_restart(restart_block); | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * This will restart clock_nanosleep. This is required only by | |
1041 | * compat_clock_nanosleep_restart for now. | |
1042 | */ | |
1043 | long | |
1044 | clock_nanosleep_restart(struct restart_block *restart_block) | |
1045 | { | |
1046 | clockid_t which_clock = restart_block->arg0; | |
1047 | ||
1048 | return CLOCK_DISPATCH(which_clock, nsleep_restart, | |
1049 | (restart_block)); | |
1050 | } |