blob: 35b4bbfc78ff6ee7d3f389baf0430231ed09af7b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Uwe Zeisbergerf30c2262006-10-03 23:01:26 +02002 * linux/kernel/posix-timers.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/interrupt.h>
35#include <linux/slab.h>
36#include <linux/time.h>
Arjan van de Ven97d1f152006-03-23 03:00:24 -080037#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <asm/uaccess.h>
40#include <asm/semaphore.h>
41#include <linux/list.h>
42#include <linux/init.h>
43#include <linux/compiler.h>
44#include <linux/idr.h>
45#include <linux/posix-timers.h>
46#include <linux/syscalls.h>
47#include <linux/wait.h>
48#include <linux/workqueue.h>
49#include <linux/module.h>
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051/*
52 * Management arrays for POSIX timers. Timers are kept in slab memory
53 * Timer ids are allocated by an external routine that keeps track of the
54 * id and the timer. The external interface is:
55 *
56 * void *idr_find(struct idr *idp, int id); to find timer_id <id>
57 * int idr_get_new(struct idr *idp, void *ptr); to get a new id and
58 * related it to <ptr>
59 * void idr_remove(struct idr *idp, int id); to release <id>
60 * void idr_init(struct idr *idp); to initialize <idp>
61 * which we supply.
62 * The idr_get_new *may* call slab for more memory so it must not be
63 * called under a spin lock. Likewise idr_remore may release memory
64 * (but it may be ok to do this under a lock...).
65 * idr_find is just a memory look up and is quite fast. A -1 return
66 * indicates that the requested id does not exist.
67 */
68
69/*
70 * Lets keep our timers in a slab cache :-)
71 */
Christoph Lametere18b8902006-12-06 20:33:20 -080072static struct kmem_cache *posix_timers_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073static struct idr posix_timers_id;
74static DEFINE_SPINLOCK(idr_lock);
75
76/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 * we assume that the new SIGEV_THREAD_ID shares no bits with the other
78 * SIGEV values. Here we put out an error if this assumption fails.
79 */
80#if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \
81 ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD))
82#error "SIGEV_THREAD_ID must not share bit with other SIGEV values!"
83#endif
84
85
86/*
87 * The timer ID is turned into a timer address by idr_find().
88 * Verifying a valid ID consists of:
89 *
90 * a) checking that idr_find() returns other than -1.
91 * b) checking that the timer id matches the one in the timer itself.
92 * c) that the timer owner is in the callers thread group.
93 */
94
95/*
96 * CLOCKs: The POSIX standard calls for a couple of clocks and allows us
97 * to implement others. This structure defines the various
98 * clocks and allows the possibility of adding others. We
99 * provide an interface to add clocks to the table and expect
100 * the "arch" code to add at least one clock that is high
101 * resolution. Here we define the standard CLOCK_REALTIME as a
102 * 1/HZ resolution clock.
103 *
104 * RESOLUTION: Clock resolution is used to round up timer and interval
105 * times, NOT to report clock times, which are reported with as
106 * much resolution as the system can muster. In some cases this
107 * resolution may depend on the underlying clock hardware and
108 * may not be quantifiable until run time, and only then is the
109 * necessary code is written. The standard says we should say
110 * something about this issue in the documentation...
111 *
112 * FUNCTIONS: The CLOCKs structure defines possible functions to handle
113 * various clock functions. For clocks that use the standard
114 * system timer code these entries should be NULL. This will
115 * allow dispatch without the overhead of indirect function
116 * calls. CLOCKS that depend on other sources (e.g. WWV or GPS)
117 * must supply functions here, even if the function just returns
118 * ENOSYS. The standard POSIX timer management code assumes the
119 * following: 1.) The k_itimer struct (sched.h) is used for the
120 * timer. 2.) The list, it_lock, it_clock, it_id and it_process
121 * fields are not modified by timer code.
122 *
123 * At this time all functions EXCEPT clock_nanosleep can be
124 * redirected by the CLOCKS structure. Clock_nanosleep is in
125 * there, but the code ignores it.
126 *
127 * Permissions: It is assumed that the clock_settime() function defined
128 * for each clock will take care of permission checks. Some
129 * clocks may be set able by any user (i.e. local process
130 * clocks) others not. Currently the only set able clock we
131 * have is CLOCK_REALTIME and its high res counter part, both of
132 * which we beg off on and pass to do_sys_settimeofday().
133 */
134
135static struct k_clock posix_clocks[MAX_CLOCKS];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800137/*
138 * These ones are defined below.
139 */
140static int common_nsleep(const clockid_t, int flags, struct timespec *t,
141 struct timespec __user *rmtp);
142static void common_timer_get(struct k_itimer *, struct itimerspec *);
143static int common_timer_set(struct k_itimer *, int,
144 struct itimerspec *, struct itimerspec *);
145static int common_timer_del(struct k_itimer *timer);
146
Thomas Gleixnerc9cb2e32007-02-16 01:27:49 -0800147static enum hrtimer_restart posix_timer_fn(struct hrtimer *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149static struct k_itimer *lock_timer(timer_t timer_id, unsigned long *flags);
150
151static inline void unlock_timer(struct k_itimer *timr, unsigned long flags)
152{
153 spin_unlock_irqrestore(&timr->it_lock, flags);
154}
155
156/*
157 * Call the k_clock hook function if non-null, or the default function.
158 */
159#define CLOCK_DISPATCH(clock, call, arglist) \
160 ((clock) < 0 ? posix_cpu_##call arglist : \
161 (posix_clocks[clock].call != NULL \
162 ? (*posix_clocks[clock].call) arglist : common_##call arglist))
163
164/*
165 * Default clock hook functions when the struct k_clock passed
166 * to register_posix_clock leaves a function pointer null.
167 *
168 * The function common_CALL is the default implementation for
169 * the function pointer CALL in struct k_clock.
170 */
171
Thomas Gleixnera924b042006-01-09 20:52:27 -0800172static inline int common_clock_getres(const clockid_t which_clock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 struct timespec *tp)
174{
175 tp->tv_sec = 0;
176 tp->tv_nsec = posix_clocks[which_clock].res;
177 return 0;
178}
179
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800180/*
181 * Get real time for posix timers
182 */
183static int common_clock_get(clockid_t which_clock, struct timespec *tp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800185 ktime_get_real_ts(tp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 return 0;
187}
188
Thomas Gleixnera924b042006-01-09 20:52:27 -0800189static inline int common_clock_set(const clockid_t which_clock,
190 struct timespec *tp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
192 return do_sys_settimeofday(tp, NULL);
193}
194
Arjan van de Ven858119e2006-01-14 13:20:43 -0800195static int common_timer_create(struct k_itimer *new_timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
George Anzinger7978672c2006-02-01 03:05:11 -0800197 hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 return 0;
199}
200
201/*
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800202 * Return nonzero if we know a priori this clockid_t value is bogus.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 */
Thomas Gleixnera924b042006-01-09 20:52:27 -0800204static inline int invalid_clockid(const clockid_t which_clock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
206 if (which_clock < 0) /* CPU clock, posix_cpu_* will check it */
207 return 0;
208 if ((unsigned) which_clock >= MAX_CLOCKS)
209 return 1;
210 if (posix_clocks[which_clock].clock_getres != NULL)
211 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 if (posix_clocks[which_clock].res != 0)
213 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 return 1;
215}
216
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800217/*
218 * Get monotonic time for posix timers
219 */
220static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp)
221{
222 ktime_get_ts(tp);
223 return 0;
224}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226/*
227 * Initialize everything, well, just everything in Posix clocks/timers ;)
228 */
229static __init int init_posix_timers(void)
230{
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800231 struct k_clock clock_realtime = {
232 .clock_getres = hrtimer_get_res,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 };
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800234 struct k_clock clock_monotonic = {
235 .clock_getres = hrtimer_get_res,
236 .clock_get = posix_ktime_get_ts,
237 .clock_set = do_posix_clock_nosettime,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 };
239
240 register_posix_clock(CLOCK_REALTIME, &clock_realtime);
241 register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic);
242
243 posix_timers_cache = kmem_cache_create("posix_timers_cache",
Alexey Dobriyan040b5c62007-10-16 23:26:10 -0700244 sizeof (struct k_itimer), 0, SLAB_PANIC,
245 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 idr_init(&posix_timers_id);
247 return 0;
248}
249
250__initcall(init_posix_timers);
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252static void schedule_next_timer(struct k_itimer *timr)
253{
Roman Zippel44f21472006-03-26 01:38:06 -0800254 struct hrtimer *timer = &timr->it.real.timer;
255
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800256 if (timr->it.real.interval.tv64 == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 return;
258
Roman Zippel44f21472006-03-26 01:38:06 -0800259 timr->it_overrun += hrtimer_forward(timer, timer->base->get_time(),
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800260 timr->it.real.interval);
Roman Zippel44f21472006-03-26 01:38:06 -0800261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 timr->it_overrun_last = timr->it_overrun;
263 timr->it_overrun = -1;
264 ++timr->it_requeue_pending;
Roman Zippel44f21472006-03-26 01:38:06 -0800265 hrtimer_restart(timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266}
267
268/*
269 * This function is exported for use by the signal deliver code. It is
270 * called just prior to the info block being released and passes that
271 * block to us. It's function is to update the overrun entry AND to
272 * restart the timer. It should only be called if the timer is to be
273 * restarted (i.e. we have flagged this in the sys_private entry of the
274 * info block).
275 *
276 * To protect aginst the timer going away while the interrupt is queued,
277 * we require that the it_requeue_pending flag be set.
278 */
279void do_schedule_next_timer(struct siginfo *info)
280{
281 struct k_itimer *timr;
282 unsigned long flags;
283
284 timr = lock_timer(info->si_tid, &flags);
285
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800286 if (timr && timr->it_requeue_pending == info->si_sys_private) {
287 if (timr->it_clock < 0)
288 posix_cpu_timer_schedule(timr);
289 else
290 schedule_next_timer(timr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800292 info->si_overrun = timr->it_overrun_last;
293 }
294
Thomas Gleixnerb6557fb2006-02-01 03:05:09 -0800295 if (timr)
296 unlock_timer(timr, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297}
298
299int posix_timer_event(struct k_itimer *timr,int si_private)
300{
301 memset(&timr->sigq->info, 0, sizeof(siginfo_t));
302 timr->sigq->info.si_sys_private = si_private;
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800303 /* Send signal to the process that owns this timer.*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
305 timr->sigq->info.si_signo = timr->it_sigev_signo;
306 timr->sigq->info.si_errno = 0;
307 timr->sigq->info.si_code = SI_TIMER;
308 timr->sigq->info.si_tid = timr->it_id;
309 timr->sigq->info.si_value = timr->it_sigev_value;
Oleg Nesterove752dd62005-09-06 15:17:42 -0700310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 if (timr->it_sigev_notify & SIGEV_THREAD_ID) {
Oleg Nesterove752dd62005-09-06 15:17:42 -0700312 struct task_struct *leader;
313 int ret = send_sigqueue(timr->it_sigev_signo, timr->sigq,
314 timr->it_process);
315
316 if (likely(ret >= 0))
317 return ret;
318
319 timr->it_sigev_notify = SIGEV_SIGNAL;
320 leader = timr->it_process->group_leader;
321 put_task_struct(timr->it_process);
322 timr->it_process = leader;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 }
Oleg Nesterove752dd62005-09-06 15:17:42 -0700324
325 return send_group_sigqueue(timr->it_sigev_signo, timr->sigq,
326 timr->it_process);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327}
328EXPORT_SYMBOL_GPL(posix_timer_event);
329
330/*
331 * This function gets called when a POSIX.1b interval timer expires. It
332 * is used as a callback from the kernel internal timer. The
333 * run_timer_list code ALWAYS calls with interrupts on.
334
335 * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers.
336 */
Thomas Gleixnerc9cb2e32007-02-16 01:27:49 -0800337static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
Roman Zippel05cfb612006-03-26 01:38:12 -0800339 struct k_itimer *timr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 unsigned long flags;
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800341 int si_private = 0;
Thomas Gleixnerc9cb2e32007-02-16 01:27:49 -0800342 enum hrtimer_restart ret = HRTIMER_NORESTART;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Roman Zippel05cfb612006-03-26 01:38:12 -0800344 timr = container_of(timer, struct k_itimer, it.real.timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 spin_lock_irqsave(&timr->it_lock, flags);
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800346
347 if (timr->it.real.interval.tv64 != 0)
348 si_private = ++timr->it_requeue_pending;
349
350 if (posix_timer_event(timr, si_private)) {
351 /*
352 * signal was not sent because of sig_ignor
353 * we will not get a call back to restart it AND
354 * it should be restarted.
355 */
356 if (timr->it.real.interval.tv64 != 0) {
Thomas Gleixner58229a12007-06-21 20:45:15 +0000357 ktime_t now = hrtimer_cb_get_time(timer);
358
359 /*
360 * FIXME: What we really want, is to stop this
361 * timer completely and restart it in case the
362 * SIG_IGN is removed. This is a non trivial
363 * change which involves sighand locking
364 * (sigh !), which we don't want to do late in
365 * the release cycle.
366 *
367 * For now we just let timers with an interval
368 * less than a jiffie expire every jiffie to
369 * avoid softirq starvation in case of SIG_IGN
370 * and a very small interval, which would put
371 * the timer right back on the softirq pending
372 * list. By moving now ahead of time we trick
373 * hrtimer_forward() to expire the timer
374 * later, while we still maintain the overrun
375 * accuracy, but have some inconsistency in
376 * the timer_gettime() case. This is at least
377 * better than a starved softirq. A more
378 * complex fix which solves also another related
379 * inconsistency is already in the pipeline.
380 */
381#ifdef CONFIG_HIGH_RES_TIMERS
382 {
383 ktime_t kj = ktime_set(0, NSEC_PER_SEC / HZ);
384
385 if (timr->it.real.interval.tv64 < kj.tv64)
386 now = ktime_add(now, kj);
387 }
388#endif
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800389 timr->it_overrun +=
Thomas Gleixner58229a12007-06-21 20:45:15 +0000390 hrtimer_forward(timer, now,
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800391 timr->it.real.interval);
392 ret = HRTIMER_RESTART;
Roman Zippela0a0c282006-03-16 23:04:01 -0800393 ++timr->it_requeue_pending;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800397 unlock_timer(timr, flags);
398 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399}
400
Arjan van de Ven858119e2006-01-14 13:20:43 -0800401static struct task_struct * good_sigevent(sigevent_t * event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402{
403 struct task_struct *rtn = current->group_leader;
404
405 if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
406 (!(rtn = find_task_by_pid(event->sigev_notify_thread_id)) ||
Pavel Emelyanovbac0abd2007-10-18 23:40:18 -0700407 !same_thread_group(rtn, current) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL))
409 return NULL;
410
411 if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) &&
412 ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
413 return NULL;
414
415 return rtn;
416}
417
Thomas Gleixnera924b042006-01-09 20:52:27 -0800418void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419{
420 if ((unsigned) clock_id >= MAX_CLOCKS) {
421 printk("POSIX clock register failed for clock_id %d\n",
422 clock_id);
423 return;
424 }
425
426 posix_clocks[clock_id] = *new_clock;
427}
428EXPORT_SYMBOL_GPL(register_posix_clock);
429
430static struct k_itimer * alloc_posix_timer(void)
431{
432 struct k_itimer *tmr;
Robert P. J. Dayc3762222007-02-10 01:45:03 -0800433 tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 if (!tmr)
435 return tmr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 if (unlikely(!(tmr->sigq = sigqueue_alloc()))) {
437 kmem_cache_free(posix_timers_cache, tmr);
438 tmr = NULL;
439 }
440 return tmr;
441}
442
443#define IT_ID_SET 1
444#define IT_ID_NOT_SET 0
445static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
446{
447 if (it_id_set) {
448 unsigned long flags;
449 spin_lock_irqsave(&idr_lock, flags);
450 idr_remove(&posix_timers_id, tmr->it_id);
451 spin_unlock_irqrestore(&idr_lock, flags);
452 }
453 sigqueue_free(tmr->sigq);
454 if (unlikely(tmr->it_process) &&
455 tmr->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
456 put_task_struct(tmr->it_process);
457 kmem_cache_free(posix_timers_cache, tmr);
458}
459
460/* Create a POSIX.1b interval timer. */
461
462asmlinkage long
Thomas Gleixnera924b042006-01-09 20:52:27 -0800463sys_timer_create(const clockid_t which_clock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 struct sigevent __user *timer_event_spec,
465 timer_t __user * created_timer_id)
466{
467 int error = 0;
468 struct k_itimer *new_timer = NULL;
469 int new_timer_id;
470 struct task_struct *process = NULL;
471 unsigned long flags;
472 sigevent_t event;
473 int it_id_set = IT_ID_NOT_SET;
474
475 if (invalid_clockid(which_clock))
476 return -EINVAL;
477
478 new_timer = alloc_posix_timer();
479 if (unlikely(!new_timer))
480 return -EAGAIN;
481
482 spin_lock_init(&new_timer->it_lock);
483 retry:
484 if (unlikely(!idr_pre_get(&posix_timers_id, GFP_KERNEL))) {
485 error = -EAGAIN;
486 goto out;
487 }
488 spin_lock_irq(&idr_lock);
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800489 error = idr_get_new(&posix_timers_id, (void *) new_timer,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 &new_timer_id);
491 spin_unlock_irq(&idr_lock);
492 if (error == -EAGAIN)
493 goto retry;
494 else if (error) {
495 /*
496 * Wierd looking, but we return EAGAIN if the IDR is
497 * full (proper POSIX return value for this)
498 */
499 error = -EAGAIN;
500 goto out;
501 }
502
503 it_id_set = IT_ID_SET;
504 new_timer->it_id = (timer_t) new_timer_id;
505 new_timer->it_clock = which_clock;
506 new_timer->it_overrun = -1;
507 error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
508 if (error)
509 goto out;
510
511 /*
512 * return the timer_id now. The next step is hard to
513 * back out if there is an error.
514 */
515 if (copy_to_user(created_timer_id,
516 &new_timer_id, sizeof (new_timer_id))) {
517 error = -EFAULT;
518 goto out;
519 }
520 if (timer_event_spec) {
521 if (copy_from_user(&event, timer_event_spec, sizeof (event))) {
522 error = -EFAULT;
523 goto out;
524 }
525 new_timer->it_sigev_notify = event.sigev_notify;
526 new_timer->it_sigev_signo = event.sigev_signo;
527 new_timer->it_sigev_value = event.sigev_value;
528
529 read_lock(&tasklist_lock);
530 if ((process = good_sigevent(&event))) {
531 /*
532 * We may be setting up this process for another
533 * thread. It may be exiting. To catch this
534 * case the we check the PF_EXITING flag. If
535 * the flag is not set, the siglock will catch
536 * him before it is too late (in exit_itimers).
537 *
538 * The exec case is a bit more invloved but easy
539 * to code. If the process is in our thread
540 * group (and it must be or we would not allow
541 * it here) and is doing an exec, it will cause
542 * us to be killed. In this case it will wait
543 * for us to die which means we can finish this
544 * linkage with our last gasp. I.e. no code :)
545 */
546 spin_lock_irqsave(&process->sighand->siglock, flags);
547 if (!(process->flags & PF_EXITING)) {
548 new_timer->it_process = process;
549 list_add(&new_timer->list,
550 &process->signal->posix_timers);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
552 get_task_struct(process);
Oleg Nesterovd02479b2007-08-22 14:01:37 -0700553 spin_unlock_irqrestore(&process->sighand->siglock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 } else {
555 spin_unlock_irqrestore(&process->sighand->siglock, flags);
556 process = NULL;
557 }
558 }
559 read_unlock(&tasklist_lock);
560 if (!process) {
561 error = -EINVAL;
562 goto out;
563 }
564 } else {
565 new_timer->it_sigev_notify = SIGEV_SIGNAL;
566 new_timer->it_sigev_signo = SIGALRM;
567 new_timer->it_sigev_value.sival_int = new_timer->it_id;
568 process = current->group_leader;
569 spin_lock_irqsave(&process->sighand->siglock, flags);
570 new_timer->it_process = process;
571 list_add(&new_timer->list, &process->signal->posix_timers);
572 spin_unlock_irqrestore(&process->sighand->siglock, flags);
573 }
574
575 /*
576 * In the case of the timer belonging to another task, after
577 * the task is unlocked, the timer is owned by the other task
578 * and may cease to exist at any time. Don't use or modify
579 * new_timer after the unlock call.
580 */
581
582out:
583 if (error)
584 release_posix_timer(new_timer, it_id_set);
585
586 return error;
587}
588
589/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 * Locking issues: We need to protect the result of the id look up until
591 * we get the timer locked down so it is not deleted under us. The
592 * removal is done under the idr spinlock so we use that here to bridge
593 * the find to the timer lock. To avoid a dead lock, the timer id MUST
594 * be release with out holding the timer lock.
595 */
596static struct k_itimer * lock_timer(timer_t timer_id, unsigned long *flags)
597{
598 struct k_itimer *timr;
599 /*
600 * Watch out here. We do a irqsave on the idr_lock and pass the
601 * flags part over to the timer lock. Must not let interrupts in
602 * while we are moving the lock.
603 */
604
605 spin_lock_irqsave(&idr_lock, *flags);
606 timr = (struct k_itimer *) idr_find(&posix_timers_id, (int) timer_id);
607 if (timr) {
608 spin_lock(&timr->it_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
610 if ((timr->it_id != timer_id) || !(timr->it_process) ||
Pavel Emelyanovbac0abd2007-10-18 23:40:18 -0700611 !same_thread_group(timr->it_process, current)) {
Thomas Gleixner179394a2007-08-22 14:01:37 -0700612 spin_unlock(&timr->it_lock);
613 spin_unlock_irqrestore(&idr_lock, *flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 timr = NULL;
Thomas Gleixner179394a2007-08-22 14:01:37 -0700615 } else
616 spin_unlock(&idr_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 } else
618 spin_unlock_irqrestore(&idr_lock, *flags);
619
620 return timr;
621}
622
623/*
624 * Get the time remaining on a POSIX.1b interval timer. This function
625 * is ALWAYS called with spin_lock_irq on the timer, thus it must not
626 * mess with irq.
627 *
628 * We have a couple of messes to clean up here. First there is the case
629 * of a timer that has a requeue pending. These timers should appear to
630 * be in the timer list with an expiry as if we were to requeue them
631 * now.
632 *
633 * The second issue is the SIGEV_NONE timer which may be active but is
634 * not really ever put in the timer list (to save system resources).
635 * This timer may be expired, and if so, we will do it here. Otherwise
636 * it is the same as a requeue pending timer WRT to what we should
637 * report.
638 */
639static void
640common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting)
641{
Roman Zippel3b98a532006-03-26 01:38:07 -0800642 ktime_t now, remaining, iv;
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800643 struct hrtimer *timer = &timr->it.real.timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800645 memset(cur_setting, 0, sizeof(struct itimerspec));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
Roman Zippel3b98a532006-03-26 01:38:07 -0800647 iv = timr->it.real.interval;
648
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800649 /* interval timer ? */
Roman Zippel3b98a532006-03-26 01:38:07 -0800650 if (iv.tv64)
651 cur_setting->it_interval = ktime_to_timespec(iv);
652 else if (!hrtimer_active(timer) &&
653 (timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE)
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800654 return;
Roman Zippel3b98a532006-03-26 01:38:07 -0800655
656 now = timer->base->get_time();
657
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800658 /*
Roman Zippel3b98a532006-03-26 01:38:07 -0800659 * When a requeue is pending or this is a SIGEV_NONE
660 * timer move the expiry time forward by intervals, so
661 * expiry is > now.
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800662 */
Roman Zippel3b98a532006-03-26 01:38:07 -0800663 if (iv.tv64 && (timr->it_requeue_pending & REQUEUE_PENDING ||
664 (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE))
665 timr->it_overrun += hrtimer_forward(timer, now, iv);
666
667 remaining = ktime_sub(timer->expires, now);
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800668 /* Return 0 only, when the timer is expired and not pending */
Roman Zippel3b98a532006-03-26 01:38:07 -0800669 if (remaining.tv64 <= 0) {
670 /*
671 * A single shot SIGEV_NONE timer must return 0, when
672 * it is expired !
673 */
674 if ((timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE)
675 cur_setting->it_value.tv_nsec = 1;
676 } else
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800677 cur_setting->it_value = ktime_to_timespec(remaining);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678}
679
680/* Get the time remaining on a POSIX.1b interval timer. */
681asmlinkage long
682sys_timer_gettime(timer_t timer_id, struct itimerspec __user *setting)
683{
684 struct k_itimer *timr;
685 struct itimerspec cur_setting;
686 unsigned long flags;
687
688 timr = lock_timer(timer_id, &flags);
689 if (!timr)
690 return -EINVAL;
691
692 CLOCK_DISPATCH(timr->it_clock, timer_get, (timr, &cur_setting));
693
694 unlock_timer(timr, flags);
695
696 if (copy_to_user(setting, &cur_setting, sizeof (cur_setting)))
697 return -EFAULT;
698
699 return 0;
700}
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800701
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702/*
703 * Get the number of overruns of a POSIX.1b interval timer. This is to
704 * be the overrun of the timer last delivered. At the same time we are
705 * accumulating overruns on the next timer. The overrun is frozen when
706 * the signal is delivered, either at the notify time (if the info block
707 * is not queued) or at the actual delivery time (as we are informed by
708 * the call back to do_schedule_next_timer(). So all we need to do is
709 * to pick up the frozen overrun.
710 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711asmlinkage long
712sys_timer_getoverrun(timer_t timer_id)
713{
714 struct k_itimer *timr;
715 int overrun;
Al Viro5ba25332007-10-14 19:35:50 +0100716 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718 timr = lock_timer(timer_id, &flags);
719 if (!timr)
720 return -EINVAL;
721
722 overrun = timr->it_overrun_last;
723 unlock_timer(timr, flags);
724
725 return overrun;
726}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
728/* Set a POSIX.1b interval timer. */
729/* timr->it_lock is taken. */
Arjan van de Ven858119e2006-01-14 13:20:43 -0800730static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731common_timer_set(struct k_itimer *timr, int flags,
732 struct itimerspec *new_setting, struct itimerspec *old_setting)
733{
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800734 struct hrtimer *timer = &timr->it.real.timer;
George Anzinger7978672c2006-02-01 03:05:11 -0800735 enum hrtimer_mode mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
737 if (old_setting)
738 common_timer_get(timr, old_setting);
739
740 /* disable the timer */
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800741 timr->it.real.interval.tv64 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 /*
743 * careful here. If smp we could be in the "fire" routine which will
744 * be spinning as we hold the lock. But this is ONLY an SMP issue.
745 */
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800746 if (hrtimer_try_to_cancel(timer) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 return TIMER_RETRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
749 timr->it_requeue_pending = (timr->it_requeue_pending + 2) &
750 ~REQUEUE_PENDING;
751 timr->it_overrun_last = 0;
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800752
753 /* switch off the timer when it_value is zero */
754 if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
Thomas Gleixnerc9cb2e32007-02-16 01:27:49 -0800757 mode = flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL;
George Anzinger7978672c2006-02-01 03:05:11 -0800758 hrtimer_init(&timr->it.real.timer, timr->it_clock, mode);
George Anzinger7978672c2006-02-01 03:05:11 -0800759 timr->it.real.timer.function = posix_timer_fn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800761 timer->expires = timespec_to_ktime(new_setting->it_value);
762
763 /* Convert interval */
764 timr->it.real.interval = timespec_to_ktime(new_setting->it_interval);
765
766 /* SIGEV_NONE timers are not queued ! See common_timer_get */
Thomas Gleixner952bbc82006-02-01 03:05:13 -0800767 if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) {
768 /* Setup correct expiry time for relative timers */
Thomas Gleixnerc9cb2e32007-02-16 01:27:49 -0800769 if (mode == HRTIMER_MODE_REL)
Thomas Gleixner952bbc82006-02-01 03:05:13 -0800770 timer->expires = ktime_add(timer->expires,
771 timer->base->get_time());
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800772 return 0;
Thomas Gleixner952bbc82006-02-01 03:05:13 -0800773 }
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800774
George Anzinger7978672c2006-02-01 03:05:11 -0800775 hrtimer_start(timer, timer->expires, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 return 0;
777}
778
779/* Set a POSIX.1b interval timer */
780asmlinkage long
781sys_timer_settime(timer_t timer_id, int flags,
782 const struct itimerspec __user *new_setting,
783 struct itimerspec __user *old_setting)
784{
785 struct k_itimer *timr;
786 struct itimerspec new_spec, old_spec;
787 int error = 0;
Al Viro5ba25332007-10-14 19:35:50 +0100788 unsigned long flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 struct itimerspec *rtn = old_setting ? &old_spec : NULL;
790
791 if (!new_setting)
792 return -EINVAL;
793
794 if (copy_from_user(&new_spec, new_setting, sizeof (new_spec)))
795 return -EFAULT;
796
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800797 if (!timespec_valid(&new_spec.it_interval) ||
798 !timespec_valid(&new_spec.it_value))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 return -EINVAL;
800retry:
801 timr = lock_timer(timer_id, &flag);
802 if (!timr)
803 return -EINVAL;
804
805 error = CLOCK_DISPATCH(timr->it_clock, timer_set,
806 (timr, flags, &new_spec, rtn));
807
808 unlock_timer(timr, flag);
809 if (error == TIMER_RETRY) {
810 rtn = NULL; // We already got the old time...
811 goto retry;
812 }
813
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800814 if (old_setting && !error &&
815 copy_to_user(old_setting, &old_spec, sizeof (old_spec)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 error = -EFAULT;
817
818 return error;
819}
820
821static inline int common_timer_del(struct k_itimer *timer)
822{
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800823 timer->it.real.interval.tv64 = 0;
Oleg Nesterovf972be32005-06-23 00:09:00 -0700824
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800825 if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 return TIMER_RETRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 return 0;
828}
829
830static inline int timer_delete_hook(struct k_itimer *timer)
831{
832 return CLOCK_DISPATCH(timer->it_clock, timer_del, (timer));
833}
834
835/* Delete a POSIX.1b interval timer. */
836asmlinkage long
837sys_timer_delete(timer_t timer_id)
838{
839 struct k_itimer *timer;
Al Viro5ba25332007-10-14 19:35:50 +0100840 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842retry_delete:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 timer = lock_timer(timer_id, &flags);
844 if (!timer)
845 return -EINVAL;
846
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800847 if (timer_delete_hook(timer) == TIMER_RETRY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 unlock_timer(timer, flags);
849 goto retry_delete;
850 }
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800851
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 spin_lock(&current->sighand->siglock);
853 list_del(&timer->list);
854 spin_unlock(&current->sighand->siglock);
855 /*
856 * This keeps any tasks waiting on the spin lock from thinking
857 * they got something (see the lock code above).
858 */
859 if (timer->it_process) {
860 if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
861 put_task_struct(timer->it_process);
862 timer->it_process = NULL;
863 }
864 unlock_timer(timer, flags);
865 release_posix_timer(timer, IT_ID_SET);
866 return 0;
867}
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800868
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869/*
870 * return timer owned by the process, used by exit_itimers
871 */
Arjan van de Ven858119e2006-01-14 13:20:43 -0800872static void itimer_delete(struct k_itimer *timer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873{
874 unsigned long flags;
875
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876retry_delete:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 spin_lock_irqsave(&timer->it_lock, flags);
878
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800879 if (timer_delete_hook(timer) == TIMER_RETRY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 unlock_timer(timer, flags);
881 goto retry_delete;
882 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 list_del(&timer->list);
884 /*
885 * This keeps any tasks waiting on the spin lock from thinking
886 * they got something (see the lock code above).
887 */
888 if (timer->it_process) {
889 if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
890 put_task_struct(timer->it_process);
891 timer->it_process = NULL;
892 }
893 unlock_timer(timer, flags);
894 release_posix_timer(timer, IT_ID_SET);
895}
896
897/*
Roland McGrath25f407f2005-10-21 15:03:29 -0700898 * This is called by do_exit or de_thread, only when there are no more
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 * references to the shared signal_struct.
900 */
901void exit_itimers(struct signal_struct *sig)
902{
903 struct k_itimer *tmr;
904
905 while (!list_empty(&sig->posix_timers)) {
906 tmr = list_entry(sig->posix_timers.next, struct k_itimer, list);
907 itimer_delete(tmr);
908 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909}
910
Thomas Gleixnerbecf8b52006-01-09 20:52:38 -0800911/* Not available / possible... functions */
Thomas Gleixnera924b042006-01-09 20:52:27 -0800912int do_posix_clock_nosettime(const clockid_t clockid, struct timespec *tp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913{
914 return -EINVAL;
915}
916EXPORT_SYMBOL_GPL(do_posix_clock_nosettime);
917
Thomas Gleixnera924b042006-01-09 20:52:27 -0800918int do_posix_clock_nonanosleep(const clockid_t clock, int flags,
Thomas Gleixner97735f22006-01-09 20:52:37 -0800919 struct timespec *t, struct timespec __user *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920{
921#ifndef ENOTSUP
922 return -EOPNOTSUPP; /* aka ENOTSUP in userland for POSIX */
923#else /* parisc does define it separately. */
924 return -ENOTSUP;
925#endif
926}
927EXPORT_SYMBOL_GPL(do_posix_clock_nonanosleep);
928
Thomas Gleixnera924b042006-01-09 20:52:27 -0800929asmlinkage long sys_clock_settime(const clockid_t which_clock,
930 const struct timespec __user *tp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931{
932 struct timespec new_tp;
933
934 if (invalid_clockid(which_clock))
935 return -EINVAL;
936 if (copy_from_user(&new_tp, tp, sizeof (*tp)))
937 return -EFAULT;
938
939 return CLOCK_DISPATCH(which_clock, clock_set, (which_clock, &new_tp));
940}
941
942asmlinkage long
Thomas Gleixnera924b042006-01-09 20:52:27 -0800943sys_clock_gettime(const clockid_t which_clock, struct timespec __user *tp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944{
945 struct timespec kernel_tp;
946 int error;
947
948 if (invalid_clockid(which_clock))
949 return -EINVAL;
950 error = CLOCK_DISPATCH(which_clock, clock_get,
951 (which_clock, &kernel_tp));
952 if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp)))
953 error = -EFAULT;
954
955 return error;
956
957}
958
959asmlinkage long
Thomas Gleixnera924b042006-01-09 20:52:27 -0800960sys_clock_getres(const clockid_t which_clock, struct timespec __user *tp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961{
962 struct timespec rtn_tp;
963 int error;
964
965 if (invalid_clockid(which_clock))
966 return -EINVAL;
967
968 error = CLOCK_DISPATCH(which_clock, clock_getres,
969 (which_clock, &rtn_tp));
970
971 if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) {
972 error = -EFAULT;
973 }
974
975 return error;
976}
977
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978/*
Thomas Gleixner97735f22006-01-09 20:52:37 -0800979 * nanosleep for monotonic and realtime clocks
980 */
981static int common_nsleep(const clockid_t which_clock, int flags,
982 struct timespec *tsave, struct timespec __user *rmtp)
983{
Anton Blanchard04c22712007-10-15 16:06:04 -0500984 struct timespec rmt;
985 int ret;
986
987 ret = hrtimer_nanosleep(tsave, rmtp ? &rmt : NULL,
988 flags & TIMER_ABSTIME ?
989 HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
990 which_clock);
991
992 if (ret && rmtp) {
993 if (copy_to_user(rmtp, &rmt, sizeof(*rmtp)))
994 return -EFAULT;
995 }
996
997 return ret;
Thomas Gleixner97735f22006-01-09 20:52:37 -0800998}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
1000asmlinkage long
Thomas Gleixnera924b042006-01-09 20:52:27 -08001001sys_clock_nanosleep(const clockid_t which_clock, int flags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 const struct timespec __user *rqtp,
1003 struct timespec __user *rmtp)
1004{
1005 struct timespec t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
1007 if (invalid_clockid(which_clock))
1008 return -EINVAL;
1009
1010 if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
1011 return -EFAULT;
1012
Thomas Gleixner5f82b2b2006-01-09 20:52:29 -08001013 if (!timespec_valid(&t))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 return -EINVAL;
1015
Thomas Gleixner97735f22006-01-09 20:52:37 -08001016 return CLOCK_DISPATCH(which_clock, nsleep,
1017 (which_clock, flags, &t, rmtp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018}
Toyo Abe1711ef32006-09-29 02:00:28 -07001019
1020/*
1021 * nanosleep_restart for monotonic and realtime clocks
1022 */
1023static int common_nsleep_restart(struct restart_block *restart_block)
1024{
1025 return hrtimer_nanosleep_restart(restart_block);
1026}
1027
1028/*
1029 * This will restart clock_nanosleep. This is required only by
1030 * compat_clock_nanosleep_restart for now.
1031 */
1032long
1033clock_nanosleep_restart(struct restart_block *restart_block)
1034{
1035 clockid_t which_clock = restart_block->arg0;
1036
1037 return CLOCK_DISPATCH(which_clock, nsleep_restart,
1038 (restart_block));
1039}