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// 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
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