diff options
| -rw-r--r-- | include/linux/posix-timers.h | 7 | ||||
| -rw-r--r-- | kernel/posix-cpu-timers.c | 23 | ||||
| -rw-r--r-- | kernel/posix-timers.c | 151 |
3 files changed, 45 insertions, 136 deletions
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h index ae51473..3c0a5be 100644 --- a/include/linux/posix-timers.h +++ b/include/linux/posix-timers.h @@ -81,7 +81,7 @@ struct k_clock { int (*clock_get) (const clockid_t which_clock, struct timespec * tp); int (*timer_create) (struct k_itimer *timer); int (*nsleep) (const clockid_t which_clock, int flags, - struct timespec *); + struct timespec *, struct timespec __user *); int (*timer_set) (struct k_itimer * timr, int flags, struct itimerspec * new_setting, struct itimerspec * old_setting); @@ -95,7 +95,8 @@ void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock); /* error handlers for timer_create, nanosleep and settime */ int do_posix_clock_notimer_create(struct k_itimer *timer); -int do_posix_clock_nonanosleep(const clockid_t, int flags, struct timespec *); +int do_posix_clock_nonanosleep(const clockid_t, int flags, struct timespec *, + struct timespec __user *); int do_posix_clock_nosettime(const clockid_t, struct timespec *tp); /* function to call to trigger timer event */ @@ -129,7 +130,7 @@ int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *ts); int posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *ts); int posix_cpu_timer_create(struct k_itimer *timer); int posix_cpu_nsleep(const clockid_t which_clock, int flags, - struct timespec *ts); + struct timespec *rqtp, struct timespec __user *rmtp); int posix_cpu_timer_set(struct k_itimer *timer, int flags, struct itimerspec *new, struct itimerspec *old); int posix_cpu_timer_del(struct k_itimer *timer); diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c index abf6990..520f6c5 100644 --- a/kernel/posix-cpu-timers.c +++ b/kernel/posix-cpu-timers.c @@ -1400,7 +1400,7 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx, static long posix_cpu_clock_nanosleep_restart(struct restart_block *); int posix_cpu_nsleep(const clockid_t which_clock, int flags, - struct timespec *rqtp) + struct timespec *rqtp, struct timespec __user *rmtp) { struct restart_block *restart_block = ¤t_thread_info()->restart_block; @@ -1425,7 +1425,6 @@ int posix_cpu_nsleep(const clockid_t which_clock, int flags, error = posix_cpu_timer_create(&timer); timer.it_process = current; if (!error) { - struct timespec __user *rmtp; static struct itimerspec zero_it; struct itimerspec it = { .it_value = *rqtp, .it_interval = {} }; @@ -1472,7 +1471,6 @@ int posix_cpu_nsleep(const clockid_t which_clock, int flags, /* * Report back to the user the time still remaining. */ - rmtp = (struct timespec __user *) restart_block->arg1; if (rmtp != NULL && !(flags & TIMER_ABSTIME) && copy_to_user(rmtp, &it.it_value, sizeof *rmtp)) return -EFAULT; @@ -1480,6 +1478,7 @@ int posix_cpu_nsleep(const clockid_t which_clock, int flags, restart_block->fn = posix_cpu_clock_nanosleep_restart; /* Caller already set restart_block->arg1 */ restart_block->arg0 = which_clock; + restart_block->arg1 = (unsigned long) rmtp; restart_block->arg2 = rqtp->tv_sec; restart_block->arg3 = rqtp->tv_nsec; @@ -1493,10 +1492,15 @@ static long posix_cpu_clock_nanosleep_restart(struct restart_block *restart_block) { clockid_t which_clock = restart_block->arg0; - struct timespec t = { .tv_sec = restart_block->arg2, - .tv_nsec = restart_block->arg3 }; + struct timespec __user *rmtp; + struct timespec t; + + rmtp = (struct timespec __user *) restart_block->arg1; + t.tv_sec = restart_block->arg2; + t.tv_nsec = restart_block->arg3; + restart_block->fn = do_no_restart_syscall; - return posix_cpu_nsleep(which_clock, TIMER_ABSTIME, &t); + return posix_cpu_nsleep(which_clock, TIMER_ABSTIME, &t, rmtp); } @@ -1519,9 +1523,10 @@ static int process_cpu_timer_create(struct k_itimer *timer) return posix_cpu_timer_create(timer); } static int process_cpu_nsleep(const clockid_t which_clock, int flags, - struct timespec *rqtp) + struct timespec *rqtp, + struct timespec __user *rmtp) { - return posix_cpu_nsleep(PROCESS_CLOCK, flags, rqtp); + return posix_cpu_nsleep(PROCESS_CLOCK, flags, rqtp, rmtp); } static int thread_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp) @@ -1539,7 +1544,7 @@ static int thread_cpu_timer_create(struct k_itimer *timer) return posix_cpu_timer_create(timer); } static int thread_cpu_nsleep(const clockid_t which_clock, int flags, - struct timespec *rqtp) + struct timespec *rqtp, struct timespec __user *rmtp) { return -EINVAL; } diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c index 6b851a1..ba90058 100644 --- a/kernel/posix-timers.c +++ b/kernel/posix-timers.c @@ -209,7 +209,8 @@ static inline int common_timer_create(struct k_itimer *new_timer) /* * These ones are defined below. */ -static int common_nsleep(const clockid_t, int flags, struct timespec *t); +static int common_nsleep(const clockid_t, int flags, struct timespec *t, + struct timespec __user *rmtp); static void common_timer_get(struct k_itimer *, struct itimerspec *); static int common_timer_set(struct k_itimer *, int, struct itimerspec *, struct itimerspec *); @@ -1227,7 +1228,7 @@ int do_posix_clock_notimer_create(struct k_itimer *timer) EXPORT_SYMBOL_GPL(do_posix_clock_notimer_create); int do_posix_clock_nonanosleep(const clockid_t clock, int flags, - struct timespec *t) + struct timespec *t, struct timespec __user *r) { #ifndef ENOTSUP return -EOPNOTSUPP; /* aka ENOTSUP in userland for POSIX */ @@ -1387,7 +1388,28 @@ void clock_was_set(void) up(&clock_was_set_lock); } -long clock_nanosleep_restart(struct restart_block *restart_block); +/* + * nanosleep for monotonic and realtime clocks + */ +static int common_nsleep(const clockid_t which_clock, int flags, + struct timespec *tsave, struct timespec __user *rmtp) +{ + int mode = flags & TIMER_ABSTIME ? HRTIMER_ABS : HRTIMER_REL; + int clockid = which_clock; + + switch (which_clock) { + case CLOCK_REALTIME: + /* Posix madness. Only absolute timers on clock realtime + are affected by clock set. */ + if (mode == HRTIMER_ABS) + clockid = CLOCK_MONOTONIC; + case CLOCK_MONOTONIC: + break; + default: + return -EINVAL; + } + return hrtimer_nanosleep(tsave, rmtp, mode, clockid); +} asmlinkage long sys_clock_nanosleep(const clockid_t which_clock, int flags, @@ -1395,9 +1417,6 @@ sys_clock_nanosleep(const clockid_t which_clock, int flags, struct timespec __user *rmtp) { struct timespec t; - struct restart_block *restart_block = - &(current_thread_info()->restart_block); - int ret; if (invalid_clockid(which_clock)) return -EINVAL; @@ -1408,122 +1427,6 @@ sys_clock_nanosleep(const clockid_t which_clock, int flags, if (!timespec_valid(&t)) return -EINVAL; - /* - * Do this here as nsleep function does not have the real address. - */ - restart_block->arg1 = (unsigned long)rmtp; - - ret = CLOCK_DISPATCH(which_clock, nsleep, (which_clock, flags, &t)); - - if ((ret == -ERESTART_RESTARTBLOCK) && rmtp && - copy_to_user(rmtp, &t, sizeof (t))) - return -EFAULT; - return ret; -} - - -static int common_nsleep(const clockid_t which_clock, - int flags, struct timespec *tsave) -{ - struct timespec t, dum; - DECLARE_WAITQUEUE(abs_wqueue, current); - u64 rq_time = (u64)0; - s64 left; - int abs; - struct restart_block *restart_block = - ¤t_thread_info()->restart_block; - - abs_wqueue.flags = 0; - abs = flags & TIMER_ABSTIME; - - if (restart_block->fn == clock_nanosleep_restart) { - /* - * Interrupted by a non-delivered signal, pick up remaining - * time and continue. Remaining time is in arg2 & 3. - */ - restart_block->fn = do_no_restart_syscall; - - rq_time = restart_block->arg3; - rq_time = (rq_time << 32) + restart_block->arg2; - if (!rq_time) - return -EINTR; - left = rq_time - get_jiffies_64(); - if (left <= (s64)0) - return 0; /* Already passed */ - } - - if (abs && (posix_clocks[which_clock].clock_get != - posix_clocks[CLOCK_MONOTONIC].clock_get)) - add_wait_queue(&nanosleep_abs_wqueue, &abs_wqueue); - - do { - t = *tsave; - if (abs || !rq_time) { - adjust_abs_time(&posix_clocks[which_clock], &t, abs, - &rq_time, &dum); - } - - left = rq_time - get_jiffies_64(); - if (left >= (s64)MAX_JIFFY_OFFSET) - left = (s64)MAX_JIFFY_OFFSET; - if (left < (s64)0) - break; - - schedule_timeout_interruptible(left); - - left = rq_time - get_jiffies_64(); - } while (left > (s64)0 && !test_thread_flag(TIF_SIGPENDING)); - - if (abs_wqueue.task_list.next) - finish_wait(&nanosleep_abs_wqueue, &abs_wqueue); - - if (left > (s64)0) { - - /* - * Always restart abs calls from scratch to pick up any - * clock shifting that happened while we are away. - */ - if (abs) - return -ERESTARTNOHAND; - - left *= TICK_NSEC; - tsave->tv_sec = div_long_long_rem(left, - NSEC_PER_SEC, - &tsave->tv_nsec); - /* - * Restart works by saving the time remaing in - * arg2 & 3 (it is 64-bits of jiffies). The other - * info we need is the clock_id (saved in arg0). - * The sys_call interface needs the users - * timespec return address which _it_ saves in arg1. - * Since we have cast the nanosleep call to a clock_nanosleep - * both can be restarted with the same code. - */ - restart_block->fn = clock_nanosleep_restart; - restart_block->arg0 = which_clock; - /* - * Caller sets arg1 - */ - restart_block->arg2 = rq_time & 0xffffffffLL; - restart_block->arg3 = rq_time >> 32; - - return -ERESTART_RESTARTBLOCK; - } - - return 0; -} -/* - * This will restart clock_nanosleep. - */ -long -clock_nanosleep_restart(struct restart_block *restart_block) -{ - struct timespec t; - int ret = common_nsleep(restart_block->arg0, 0, &t); - - if ((ret == -ERESTART_RESTARTBLOCK) && restart_block->arg1 && - copy_to_user((struct timespec __user *)(restart_block->arg1), &t, - sizeof (t))) - return -EFAULT; - return ret; + return CLOCK_DISPATCH(which_clock, nsleep, + (which_clock, flags, &t, rmtp)); } |
