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xianfeng |
/*
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* linux/kernel/posix-timers.c
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*
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*
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* 2002-10-15 Posix Clocks & timers
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* by George Anzinger george@mvista.com
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*
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* Copyright (C) 2002 2003 by MontaVista Software.
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*
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* 2004-06-01 Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug.
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* Copyright (C) 2004 Boris Hu
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* MontaVista Software | 1237 East Arques Avenue | Sunnyvale | CA 94085 | USA
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*/
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/* These are all the functions necessary to implement
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* POSIX clocks & timers
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*/
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include <asm/semaphore.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/compiler.h>
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#include <linux/idr.h>
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#include <linux/posix-timers.h>
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#include <linux/syscalls.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <linux/module.h>
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/*
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* Management arrays for POSIX timers. Timers are kept in slab memory
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* Timer ids are allocated by an external routine that keeps track of the
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* id and the timer. The external interface is:
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*
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* void *idr_find(struct idr *idp, int id); to find timer_id <id>
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* int idr_get_new(struct idr *idp, void *ptr); to get a new id and
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* related it to <ptr>
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* void idr_remove(struct idr *idp, int id); to release <id>
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* void idr_init(struct idr *idp); to initialize <idp>
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* which we supply.
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* The idr_get_new *may* call slab for more memory so it must not be
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* called under a spin lock. Likewise idr_remore may release memory
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* (but it may be ok to do this under a lock...).
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* idr_find is just a memory look up and is quite fast. A -1 return
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* indicates that the requested id does not exist.
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*/
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/*
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* Lets keep our timers in a slab cache :-)
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*/
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static struct kmem_cache *posix_timers_cache;
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static struct idr posix_timers_id;
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static DEFINE_SPINLOCK(idr_lock);
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/*
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* we assume that the new SIGEV_THREAD_ID shares no bits with the other
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* SIGEV values. Here we put out an error if this assumption fails.
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*/
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#if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \
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~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD))
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#error "SIGEV_THREAD_ID must not share bit with other SIGEV values!"
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#endif
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/*
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* The timer ID is turned into a timer address by idr_find().
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* Verifying a valid ID consists of:
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*
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* a) checking that idr_find() returns other than -1.
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* b) checking that the timer id matches the one in the timer itself.
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* c) that the timer owner is in the callers thread group.
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*/
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/*
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* CLOCKs: The POSIX standard calls for a couple of clocks and allows us
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* to implement others. This structure defines the various
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* clocks and allows the possibility of adding others. We
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* provide an interface to add clocks to the table and expect
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* the "arch" code to add at least one clock that is high
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* resolution. Here we define the standard CLOCK_REALTIME as a
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* 1/HZ resolution clock.
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*
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* RESOLUTION: Clock resolution is used to round up timer and interval
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* times, NOT to report clock times, which are reported with as
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* much resolution as the system can muster. In some cases this
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* resolution may depend on the underlying clock hardware and
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* may not be quantifiable until run time, and only then is the
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* necessary code is written. The standard says we should say
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* something about this issue in the documentation...
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*
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* FUNCTIONS: The CLOCKs structure defines possible functions to handle
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* various clock functions. For clocks that use the standard
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* system timer code these entries should be NULL. This will
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* allow dispatch without the overhead of indirect function
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* calls. CLOCKS that depend on other sources (e.g. WWV or GPS)
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* must supply functions here, even if the function just returns
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* ENOSYS. The standard POSIX timer management code assumes the
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* following: 1.) The k_itimer struct (sched.h) is used for the
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* timer. 2.) The list, it_lock, it_clock, it_id and it_process
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* fields are not modified by timer code.
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*
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* At this time all functions EXCEPT clock_nanosleep can be
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* redirected by the CLOCKS structure. Clock_nanosleep is in
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* there, but the code ignores it.
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*
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* Permissions: It is assumed that the clock_settime() function defined
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* for each clock will take care of permission checks. Some
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* clocks may be set able by any user (i.e. local process
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* clocks) others not. Currently the only set able clock we
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* have is CLOCK_REALTIME and its high res counter part, both of
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* which we beg off on and pass to do_sys_settimeofday().
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*/
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static struct k_clock posix_clocks[MAX_CLOCKS];
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/*
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* These ones are defined below.
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*/
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static int common_nsleep(const clockid_t, int flags, struct timespec *t,
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struct timespec __user *rmtp);
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static void common_timer_get(struct k_itimer *, struct itimerspec *);
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static int common_timer_set(struct k_itimer *, int,
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struct itimerspec *, struct itimerspec *);
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static int common_timer_del(struct k_itimer *timer);
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static enum hrtimer_restart posix_timer_fn(struct hrtimer *data);
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static struct k_itimer *lock_timer(timer_t timer_id, unsigned long *flags);
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static inline void unlock_timer(struct k_itimer *timr, unsigned long flags)
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{
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spin_unlock_irqrestore(&timr->it_lock, flags);
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}
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/*
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* Call the k_clock hook function if non-null, or the default function.
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*/
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#define CLOCK_DISPATCH(clock, call, arglist) \
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((clock) < 0 ? posix_cpu_##call arglist : \
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(posix_clocks[clock].call != NULL \
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? (*posix_clocks[clock].call) arglist : common_##call arglist))
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/*
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* Default clock hook functions when the struct k_clock passed
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* to register_posix_clock leaves a function pointer null.
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*
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* The function common_CALL is the default implementation for
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* the function pointer CALL in struct k_clock.
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*/
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static inline int common_clock_getres(const clockid_t which_clock,
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struct timespec *tp)
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{
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tp->tv_sec = 0;
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tp->tv_nsec = posix_clocks[which_clock].res;
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return 0;
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}
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/*
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* Get real time for posix timers
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*/
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static int common_clock_get(clockid_t which_clock, struct timespec *tp)
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{
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ktime_get_real_ts(tp);
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return 0;
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}
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static inline int common_clock_set(const clockid_t which_clock,
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struct timespec *tp)
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{
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return do_sys_settimeofday(tp, NULL);
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}
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static int common_timer_create(struct k_itimer *new_timer)
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{
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hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0);
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return 0;
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}
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/*
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* Return nonzero if we know a priori this clockid_t value is bogus.
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*/
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static inline int invalid_clockid(const clockid_t which_clock)
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{
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if (which_clock < 0) /* CPU clock, posix_cpu_* will check it */
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return 0;
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if ((unsigned) which_clock >= MAX_CLOCKS)
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return 1;
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if (posix_clocks[which_clock].clock_getres != NULL)
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return 0;
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if (posix_clocks[which_clock].res != 0)
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return 0;
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return 1;
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}
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/*
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* Get monotonic time for posix timers
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*/
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static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp)
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{
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ktime_get_ts(tp);
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return 0;
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}
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/*
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* Initialize everything, well, just everything in Posix clocks/timers ;)
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*/
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static __init int init_posix_timers(void)
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{
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struct k_clock clock_realtime = {
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.clock_getres = hrtimer_get_res,
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};
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struct k_clock clock_monotonic = {
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.clock_getres = hrtimer_get_res,
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.clock_get = posix_ktime_get_ts,
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.clock_set = do_posix_clock_nosettime,
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};
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register_posix_clock(CLOCK_REALTIME, &clock_realtime);
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register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic);
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posix_timers_cache = kmem_cache_create("posix_timers_cache",
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sizeof (struct k_itimer), 0, SLAB_PANIC,
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NULL);
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idr_init(&posix_timers_id);
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return 0;
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}
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__initcall(init_posix_timers);
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static void schedule_next_timer(struct k_itimer *timr)
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{
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struct hrtimer *timer = &timr->it.real.timer;
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if (timr->it.real.interval.tv64 == 0)
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return;
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timr->it_overrun += hrtimer_forward(timer, timer->base->get_time(),
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timr->it.real.interval);
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timr->it_overrun_last = timr->it_overrun;
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timr->it_overrun = -1;
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++timr->it_requeue_pending;
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hrtimer_restart(timer);
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}
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/*
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* This function is exported for use by the signal deliver code. It is
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* called just prior to the info block being released and passes that
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* block to us. It's function is to update the overrun entry AND to
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* restart the timer. It should only be called if the timer is to be
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* restarted (i.e. we have flagged this in the sys_private entry of the
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* info block).
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*
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* To protect aginst the timer going away while the interrupt is queued,
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* we require that the it_requeue_pending flag be set.
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*/
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void do_schedule_next_timer(struct siginfo *info)
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{
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struct k_itimer *timr;
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unsigned long flags;
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timr = lock_timer(info->si_tid, &flags);
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if (timr && timr->it_requeue_pending == info->si_sys_private) {
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if (timr->it_clock < 0)
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posix_cpu_timer_schedule(timr);
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else
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schedule_next_timer(timr);
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info->si_overrun = timr->it_overrun_last;
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}
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if (timr)
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unlock_timer(timr, flags);
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}
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int posix_timer_event(struct k_itimer *timr,int si_private)
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{
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memset(&timr->sigq->info, 0, sizeof(siginfo_t));
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timr->sigq->info.si_sys_private = si_private;
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/* Send signal to the process that owns this timer.*/
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timr->sigq->info.si_signo = timr->it_sigev_signo;
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timr->sigq->info.si_errno = 0;
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timr->sigq->info.si_code = SI_TIMER;
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timr->sigq->info.si_tid = timr->it_id;
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timr->sigq->info.si_value = timr->it_sigev_value;
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if (timr->it_sigev_notify & SIGEV_THREAD_ID) {
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struct task_struct *leader;
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int ret = send_sigqueue(timr->it_sigev_signo, timr->sigq,
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timr->it_process);
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if (likely(ret >= 0))
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return ret;
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timr->it_sigev_notify = SIGEV_SIGNAL;
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leader = timr->it_process->group_leader;
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put_task_struct(timr->it_process);
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timr->it_process = leader;
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}
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return send_group_sigqueue(timr->it_sigev_signo, timr->sigq,
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timr->it_process);
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}
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EXPORT_SYMBOL_GPL(posix_timer_event);
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/*
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* This function gets called when a POSIX.1b interval timer expires. It
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* is used as a callback from the kernel internal timer. The
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* run_timer_list code ALWAYS calls with interrupts on.
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* This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers.
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*/
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static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
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{
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struct k_itimer *timr;
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unsigned long flags;
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int si_private = 0;
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|
|
enum hrtimer_restart ret = HRTIMER_NORESTART;
|
343 |
|
|
|
344 |
|
|
timr = container_of(timer, struct k_itimer, it.real.timer);
|
345 |
|
|
spin_lock_irqsave(&timr->it_lock, flags);
|
346 |
|
|
|
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) {
|
357 |
|
|
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
|
389 |
|
|
timr->it_overrun +=
|
390 |
|
|
hrtimer_forward(timer, now,
|
391 |
|
|
timr->it.real.interval);
|
392 |
|
|
ret = HRTIMER_RESTART;
|
393 |
|
|
++timr->it_requeue_pending;
|
394 |
|
|
}
|
395 |
|
|
}
|
396 |
|
|
|
397 |
|
|
unlock_timer(timr, flags);
|
398 |
|
|
return ret;
|
399 |
|
|
}
|
400 |
|
|
|
401 |
|
|
static struct task_struct * good_sigevent(sigevent_t * event)
|
402 |
|
|
{
|
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)) ||
|
407 |
|
|
!same_thread_group(rtn, current) ||
|
408 |
|
|
(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 |
|
|
|
418 |
|
|
void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock)
|
419 |
|
|
{
|
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 |
|
|
}
|
428 |
|
|
EXPORT_SYMBOL_GPL(register_posix_clock);
|
429 |
|
|
|
430 |
|
|
static struct k_itimer * alloc_posix_timer(void)
|
431 |
|
|
{
|
432 |
|
|
struct k_itimer *tmr;
|
433 |
|
|
tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL);
|
434 |
|
|
if (!tmr)
|
435 |
|
|
return tmr;
|
436 |
|
|
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
|
445 |
|
|
static 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 |
|
|
|
462 |
|
|
asmlinkage long
|
463 |
|
|
sys_timer_create(const clockid_t which_clock,
|
464 |
|
|
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);
|
489 |
|
|
error = idr_get_new(&posix_timers_id, (void *) new_timer,
|
490 |
|
|
&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);
|
551 |
|
|
if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
|
552 |
|
|
get_task_struct(process);
|
553 |
|
|
spin_unlock_irqrestore(&process->sighand->siglock, flags);
|
554 |
|
|
} 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 |
|
|
|
582 |
|
|
out:
|
583 |
|
|
if (error)
|
584 |
|
|
release_posix_timer(new_timer, it_id_set);
|
585 |
|
|
|
586 |
|
|
return error;
|
587 |
|
|
}
|
588 |
|
|
|
589 |
|
|
/*
|
590 |
|
|
* 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 |
|
|
*/
|
596 |
|
|
static 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);
|
609 |
|
|
|
610 |
|
|
if ((timr->it_id != timer_id) || !(timr->it_process) ||
|
611 |
|
|
!same_thread_group(timr->it_process, current)) {
|
612 |
|
|
spin_unlock(&timr->it_lock);
|
613 |
|
|
spin_unlock_irqrestore(&idr_lock, *flags);
|
614 |
|
|
timr = NULL;
|
615 |
|
|
} else
|
616 |
|
|
spin_unlock(&idr_lock);
|
617 |
|
|
} 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 |
|
|
*/
|
639 |
|
|
static void
|
640 |
|
|
common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting)
|
641 |
|
|
{
|
642 |
|
|
ktime_t now, remaining, iv;
|
643 |
|
|
struct hrtimer *timer = &timr->it.real.timer;
|
644 |
|
|
|
645 |
|
|
memset(cur_setting, 0, sizeof(struct itimerspec));
|
646 |
|
|
|
647 |
|
|
iv = timr->it.real.interval;
|
648 |
|
|
|
649 |
|
|
/* interval timer ? */
|
650 |
|
|
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)
|
654 |
|
|
return;
|
655 |
|
|
|
656 |
|
|
now = timer->base->get_time();
|
657 |
|
|
|
658 |
|
|
/*
|
659 |
|
|
* 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.
|
662 |
|
|
*/
|
663 |
|
|
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);
|
668 |
|
|
/* Return 0 only, when the timer is expired and not pending */
|
669 |
|
|
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
|
677 |
|
|
cur_setting->it_value = ktime_to_timespec(remaining);
|
678 |
|
|
}
|
679 |
|
|
|
680 |
|
|
/* Get the time remaining on a POSIX.1b interval timer. */
|
681 |
|
|
asmlinkage long
|
682 |
|
|
sys_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 |
|
|
}
|
701 |
|
|
|
702 |
|
|
/*
|
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 |
|
|
*/
|
711 |
|
|
asmlinkage long
|
712 |
|
|
sys_timer_getoverrun(timer_t timer_id)
|
713 |
|
|
{
|
714 |
|
|
struct k_itimer *timr;
|
715 |
|
|
int overrun;
|
716 |
|
|
unsigned long flags;
|
717 |
|
|
|
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 |
|
|
}
|
727 |
|
|
|
728 |
|
|
/* Set a POSIX.1b interval timer. */
|
729 |
|
|
/* timr->it_lock is taken. */
|
730 |
|
|
static int
|
731 |
|
|
common_timer_set(struct k_itimer *timr, int flags,
|
732 |
|
|
struct itimerspec *new_setting, struct itimerspec *old_setting)
|
733 |
|
|
{
|
734 |
|
|
struct hrtimer *timer = &timr->it.real.timer;
|
735 |
|
|
enum hrtimer_mode mode;
|
736 |
|
|
|
737 |
|
|
if (old_setting)
|
738 |
|
|
common_timer_get(timr, old_setting);
|
739 |
|
|
|
740 |
|
|
/* disable the timer */
|
741 |
|
|
timr->it.real.interval.tv64 = 0;
|
742 |
|
|
/*
|
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 |
|
|
*/
|
746 |
|
|
if (hrtimer_try_to_cancel(timer) < 0)
|
747 |
|
|
return TIMER_RETRY;
|
748 |
|
|
|
749 |
|
|
timr->it_requeue_pending = (timr->it_requeue_pending + 2) &
|
750 |
|
|
~REQUEUE_PENDING;
|
751 |
|
|
timr->it_overrun_last = 0;
|
752 |
|
|
|
753 |
|
|
/* switch off the timer when it_value is zero */
|
754 |
|
|
if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec)
|
755 |
|
|
return 0;
|
756 |
|
|
|
757 |
|
|
mode = flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL;
|
758 |
|
|
hrtimer_init(&timr->it.real.timer, timr->it_clock, mode);
|
759 |
|
|
timr->it.real.timer.function = posix_timer_fn;
|
760 |
|
|
|
761 |
|
|
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 */
|
767 |
|
|
if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) {
|
768 |
|
|
/* Setup correct expiry time for relative timers */
|
769 |
|
|
if (mode == HRTIMER_MODE_REL)
|
770 |
|
|
timer->expires = ktime_add(timer->expires,
|
771 |
|
|
timer->base->get_time());
|
772 |
|
|
return 0;
|
773 |
|
|
}
|
774 |
|
|
|
775 |
|
|
hrtimer_start(timer, timer->expires, mode);
|
776 |
|
|
return 0;
|
777 |
|
|
}
|
778 |
|
|
|
779 |
|
|
/* Set a POSIX.1b interval timer */
|
780 |
|
|
asmlinkage long
|
781 |
|
|
sys_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;
|
788 |
|
|
unsigned long flag;
|
789 |
|
|
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 |
|
|
|
797 |
|
|
if (!timespec_valid(&new_spec.it_interval) ||
|
798 |
|
|
!timespec_valid(&new_spec.it_value))
|
799 |
|
|
return -EINVAL;
|
800 |
|
|
retry:
|
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 |
|
|
|
814 |
|
|
if (old_setting && !error &&
|
815 |
|
|
copy_to_user(old_setting, &old_spec, sizeof (old_spec)))
|
816 |
|
|
error = -EFAULT;
|
817 |
|
|
|
818 |
|
|
return error;
|
819 |
|
|
}
|
820 |
|
|
|
821 |
|
|
static inline int common_timer_del(struct k_itimer *timer)
|
822 |
|
|
{
|
823 |
|
|
timer->it.real.interval.tv64 = 0;
|
824 |
|
|
|
825 |
|
|
if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0)
|
826 |
|
|
return TIMER_RETRY;
|
827 |
|
|
return 0;
|
828 |
|
|
}
|
829 |
|
|
|
830 |
|
|
static 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. */
|
836 |
|
|
asmlinkage long
|
837 |
|
|
sys_timer_delete(timer_t timer_id)
|
838 |
|
|
{
|
839 |
|
|
struct k_itimer *timer;
|
840 |
|
|
unsigned long flags;
|
841 |
|
|
|
842 |
|
|
retry_delete:
|
843 |
|
|
timer = lock_timer(timer_id, &flags);
|
844 |
|
|
if (!timer)
|
845 |
|
|
return -EINVAL;
|
846 |
|
|
|
847 |
|
|
if (timer_delete_hook(timer) == TIMER_RETRY) {
|
848 |
|
|
unlock_timer(timer, flags);
|
849 |
|
|
goto retry_delete;
|
850 |
|
|
}
|
851 |
|
|
|
852 |
|
|
spin_lock(¤t->sighand->siglock);
|
853 |
|
|
list_del(&timer->list);
|
854 |
|
|
spin_unlock(¤t->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 |
|
|
}
|
868 |
|
|
|
869 |
|
|
/*
|
870 |
|
|
* return timer owned by the process, used by exit_itimers
|
871 |
|
|
*/
|
872 |
|
|
static void itimer_delete(struct k_itimer *timer)
|
873 |
|
|
{
|
874 |
|
|
unsigned long flags;
|
875 |
|
|
|
876 |
|
|
retry_delete:
|
877 |
|
|
spin_lock_irqsave(&timer->it_lock, flags);
|
878 |
|
|
|
879 |
|
|
if (timer_delete_hook(timer) == TIMER_RETRY) {
|
880 |
|
|
unlock_timer(timer, flags);
|
881 |
|
|
goto retry_delete;
|
882 |
|
|
}
|
883 |
|
|
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 |
|
|
/*
|
898 |
|
|
* This is called by do_exit or de_thread, only when there are no more
|
899 |
|
|
* references to the shared signal_struct.
|
900 |
|
|
*/
|
901 |
|
|
void 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 |
|
|
}
|
909 |
|
|
}
|
910 |
|
|
|
911 |
|
|
/* Not available / possible... functions */
|
912 |
|
|
int do_posix_clock_nosettime(const clockid_t clockid, struct timespec *tp)
|
913 |
|
|
{
|
914 |
|
|
return -EINVAL;
|
915 |
|
|
}
|
916 |
|
|
EXPORT_SYMBOL_GPL(do_posix_clock_nosettime);
|
917 |
|
|
|
918 |
|
|
int do_posix_clock_nonanosleep(const clockid_t clock, int flags,
|
919 |
|
|
struct timespec *t, struct timespec __user *r)
|
920 |
|
|
{
|
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 |
|
|
}
|
927 |
|
|
EXPORT_SYMBOL_GPL(do_posix_clock_nonanosleep);
|
928 |
|
|
|
929 |
|
|
asmlinkage long sys_clock_settime(const clockid_t which_clock,
|
930 |
|
|
const struct timespec __user *tp)
|
931 |
|
|
{
|
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 |
|
|
|
942 |
|
|
asmlinkage long
|
943 |
|
|
sys_clock_gettime(const clockid_t which_clock, struct timespec __user *tp)
|
944 |
|
|
{
|
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 |
|
|
|
959 |
|
|
asmlinkage long
|
960 |
|
|
sys_clock_getres(const clockid_t which_clock, struct timespec __user *tp)
|
961 |
|
|
{
|
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 |
|
|
|
978 |
|
|
/*
|
979 |
|
|
* nanosleep for monotonic and realtime clocks
|
980 |
|
|
*/
|
981 |
|
|
static int common_nsleep(const clockid_t which_clock, int flags,
|
982 |
|
|
struct timespec *tsave, struct timespec __user *rmtp)
|
983 |
|
|
{
|
984 |
|
|
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;
|
998 |
|
|
}
|
999 |
|
|
|
1000 |
|
|
asmlinkage long
|
1001 |
|
|
sys_clock_nanosleep(const clockid_t which_clock, int flags,
|
1002 |
|
|
const struct timespec __user *rqtp,
|
1003 |
|
|
struct timespec __user *rmtp)
|
1004 |
|
|
{
|
1005 |
|
|
struct timespec t;
|
1006 |
|
|
|
1007 |
|
|
if (invalid_clockid(which_clock))
|
1008 |
|
|
return -EINVAL;
|
1009 |
|
|
|
1010 |
|
|
if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
|
1011 |
|
|
return -EFAULT;
|
1012 |
|
|
|
1013 |
|
|
if (!timespec_valid(&t))
|
1014 |
|
|
return -EINVAL;
|
1015 |
|
|
|
1016 |
|
|
return CLOCK_DISPATCH(which_clock, nsleep,
|
1017 |
|
|
(which_clock, flags, &t, rmtp));
|
1018 |
|
|
}
|
1019 |
|
|
|
1020 |
|
|
/*
|
1021 |
|
|
* nanosleep_restart for monotonic and realtime clocks
|
1022 |
|
|
*/
|
1023 |
|
|
static 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 |
|
|
*/
|
1032 |
|
|
long
|
1033 |
|
|
clock_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 |
|
|
}
|