diff options
Diffstat (limited to '')
| -rw-r--r-- | kernel/time/posix-stubs.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c new file mode 100644 index 0000000000..9b6fcb8d85 --- /dev/null +++ b/kernel/time/posix-stubs.c @@ -0,0 +1,209 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Dummy stubs used when CONFIG_POSIX_TIMERS=n + * + * Created by: Nicolas Pitre, July 2016 + * Copyright: (C) 2016 Linaro Limited + */ + +#include <linux/linkage.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/syscalls.h> +#include <linux/ktime.h> +#include <linux/timekeeping.h> +#include <linux/posix-timers.h> +#include <linux/time_namespace.h> +#include <linux/compat.h> + +/* + * We preserve minimal support for CLOCK_REALTIME and CLOCK_MONOTONIC + * as it is easy to remain compatible with little code. CLOCK_BOOTTIME + * is also included for convenience as at least systemd uses it. + */ + +SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, + const struct __kernel_timespec __user *, tp) +{ + struct timespec64 new_tp; + + if (which_clock != CLOCK_REALTIME) + return -EINVAL; + if (get_timespec64(&new_tp, tp)) + return -EFAULT; + + return do_sys_settimeofday64(&new_tp, NULL); +} + +static int do_clock_gettime(clockid_t which_clock, struct timespec64 *tp) +{ + switch (which_clock) { + case CLOCK_REALTIME: + ktime_get_real_ts64(tp); + break; + case CLOCK_MONOTONIC: + ktime_get_ts64(tp); + timens_add_monotonic(tp); + break; + case CLOCK_BOOTTIME: + ktime_get_boottime_ts64(tp); + timens_add_boottime(tp); + break; + default: + return -EINVAL; + } + + return 0; +} + +SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, + struct __kernel_timespec __user *, tp) +{ + int ret; + struct timespec64 kernel_tp; + + ret = do_clock_gettime(which_clock, &kernel_tp); + if (ret) + return ret; + + if (put_timespec64(&kernel_tp, tp)) + return -EFAULT; + return 0; +} + +SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct __kernel_timespec __user *, tp) +{ + struct timespec64 rtn_tp = { + .tv_sec = 0, + .tv_nsec = hrtimer_resolution, + }; + + switch (which_clock) { + case CLOCK_REALTIME: + case CLOCK_MONOTONIC: + case CLOCK_BOOTTIME: + if (put_timespec64(&rtn_tp, tp)) + return -EFAULT; + return 0; + default: + return -EINVAL; + } +} + +SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, + const struct __kernel_timespec __user *, rqtp, + struct __kernel_timespec __user *, rmtp) +{ + struct timespec64 t; + ktime_t texp; + + switch (which_clock) { + case CLOCK_REALTIME: + case CLOCK_MONOTONIC: + case CLOCK_BOOTTIME: + break; + default: + return -EINVAL; + } + + if (get_timespec64(&t, rqtp)) + return -EFAULT; + if (!timespec64_valid(&t)) + return -EINVAL; + if (flags & TIMER_ABSTIME) + rmtp = NULL; + current->restart_block.fn = do_no_restart_syscall; + current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE; + current->restart_block.nanosleep.rmtp = rmtp; + texp = timespec64_to_ktime(t); + if (flags & TIMER_ABSTIME) + texp = timens_ktime_to_host(which_clock, texp); + return hrtimer_nanosleep(texp, flags & TIMER_ABSTIME ? + HRTIMER_MODE_ABS : HRTIMER_MODE_REL, + which_clock); +} + +#ifdef CONFIG_COMPAT_32BIT_TIME + +SYSCALL_DEFINE2(clock_settime32, const clockid_t, which_clock, + struct old_timespec32 __user *, tp) +{ + struct timespec64 new_tp; + + if (which_clock != CLOCK_REALTIME) + return -EINVAL; + if (get_old_timespec32(&new_tp, tp)) + return -EFAULT; + + return do_sys_settimeofday64(&new_tp, NULL); +} + +SYSCALL_DEFINE2(clock_gettime32, clockid_t, which_clock, + struct old_timespec32 __user *, tp) +{ + int ret; + struct timespec64 kernel_tp; + + ret = do_clock_gettime(which_clock, &kernel_tp); + if (ret) + return ret; + + if (put_old_timespec32(&kernel_tp, tp)) + return -EFAULT; + return 0; +} + +SYSCALL_DEFINE2(clock_getres_time32, clockid_t, which_clock, + struct old_timespec32 __user *, tp) +{ + struct timespec64 rtn_tp = { + .tv_sec = 0, + .tv_nsec = hrtimer_resolution, + }; + + switch (which_clock) { + case CLOCK_REALTIME: + case CLOCK_MONOTONIC: + case CLOCK_BOOTTIME: + if (put_old_timespec32(&rtn_tp, tp)) + return -EFAULT; + return 0; + default: + return -EINVAL; + } +} + +SYSCALL_DEFINE4(clock_nanosleep_time32, clockid_t, which_clock, int, flags, + struct old_timespec32 __user *, rqtp, + struct old_timespec32 __user *, rmtp) +{ + struct timespec64 t; + ktime_t texp; + + switch (which_clock) { + case CLOCK_REALTIME: + case CLOCK_MONOTONIC: + case CLOCK_BOOTTIME: + break; + default: + return -EINVAL; + } + + if (get_old_timespec32(&t, rqtp)) + return -EFAULT; + if (!timespec64_valid(&t)) + return -EINVAL; + if (flags & TIMER_ABSTIME) + rmtp = NULL; + current->restart_block.fn = do_no_restart_syscall; + current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE; + current->restart_block.nanosleep.compat_rmtp = rmtp; + texp = timespec64_to_ktime(t); + if (flags & TIMER_ABSTIME) + texp = timens_ktime_to_host(which_clock, texp); + return hrtimer_nanosleep(texp, flags & TIMER_ABSTIME ? + HRTIMER_MODE_ABS : HRTIMER_MODE_REL, + which_clock); +} +#endif |