SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __user *, tp) { struct timespec rtn_tp = { .tv_sec = 0, .tv_nsec = hrtimer_resolution, }; switch (which_clock) { case CLOCK_REALTIME: case CLOCK_MONOTONIC: case CLOCK_BOOTTIME: if (copy_to_user(tp, &rtn_tp, sizeof(rtn_tp))) return -EFAULT; return 0; default: return -EINVAL; } } SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, const struct timespec __user *, rqtp, struct timespec __user *, rmtp) { struct timespec64 t64; struct timespec t; switch (which_clock) { case CLOCK_REALTIME: case CLOCK_MONOTONIC: case CLOCK_BOOTTIME: if (copy_from_user(&t, rqtp, sizeof (struct timespec))) return -EFAULT; t64 = timespec_to_timespec64(t); if (!timespec64_valid(&t64)) return -EINVAL; return hrtimer_nanosleep(&t64, rmtp, flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL, which_clock); default: return -EINVAL; } } #ifdef CONFIG_COMPAT long clock_nanosleep_restart(struct restart_block *restart_block) { return hrtimer_nanosleep_restart(restart_block); }
static long compat_nanosleep_restart(struct restart_block *restart) { struct compat_timespec __user *rmtp; struct timespec rmt; mm_segment_t oldfs; long ret; restart->nanosleep.rmtp = (struct timespec __user *) &rmt; oldfs = get_fs(); set_fs(KERNEL_DS); ret = hrtimer_nanosleep_restart(restart); set_fs(oldfs); if (ret) { rmtp = restart->nanosleep.compat_rmtp; if (rmtp && put_compat_timespec(&rmt, rmtp)) return -EFAULT; } return ret; }
/* * nanosleep_restart for monotonic and realtime clocks */ static int common_nsleep_restart(struct restart_block *restart_block) { return hrtimer_nanosleep_restart(restart_block); }