/*      $NetBSD: linux_time.c,v 1.14 2006/05/14 03:40:54 christos Exp $ */

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Emmanuel Dreyfus.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#if 0
__KERNEL_RCSID(0, "$NetBSD: linux_time.c,v 1.14 2006/05/14 03:40:54 christos Exp $");
#endif

#include <sys/param.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/syscallsubr.h>
#include <sys/time.h>

#ifdef COMPAT_LINUX32
#include <machine/../linux32/linux.h>
#include <machine/../linux32/linux32_proto.h>
#else
#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#endif

#include <compat/linux/linux_dtrace.h>
#include <compat/linux/linux_misc.h>
#include <compat/linux/linux_time.h>
#include <compat/linux/linux_util.h>

/* DTrace init */
LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);

/**
 * DTrace probes in this module.
 */
LIN_SDT_PROBE_DEFINE1(time, linux_to_native_clockid, unsupported_clockid,
    "clockid_t");
LIN_SDT_PROBE_DEFINE1(time, linux_to_native_clockid, unknown_clockid,
    "clockid_t");
LIN_SDT_PROBE_DEFINE1(time, linux_common_clock_gettime, conversion_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime, gettime_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime, copyout_error, "int");
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime64, gettime_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime64, copyout_error, "int");
#endif
LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime, conversion_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_common_clock_settime, settime_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_common_clock_settime, conversion_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime, copyin_error, "int");
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime64, conversion_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime64, copyin_error, "int");
#endif
LIN_SDT_PROBE_DEFINE0(time, linux_common_clock_getres, nullcall);
LIN_SDT_PROBE_DEFINE1(time, linux_common_clock_getres, conversion_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_common_clock_getres, getres_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_getres, copyout_error, "int");
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
LIN_SDT_PROBE_DEFINE1(time, linux_clock_getres_time64, copyout_error, "int");
#endif
LIN_SDT_PROBE_DEFINE1(time, linux_nanosleep, copyout_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_nanosleep, copyin_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, copyout_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, copyin_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_common_clock_nanosleep, unsupported_flags, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_common_clock_nanosleep, unsupported_clockid, "int");
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep_time64, copyout_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep_time64, copyin_error, "int");
#endif

static int      linux_common_clock_gettime(struct thread *, clockid_t,
                    struct timespec *);
static int      linux_common_clock_settime(struct thread *, clockid_t,
                    struct timespec *);
static int      linux_common_clock_getres(struct thread *, clockid_t,
                    struct timespec *);
static int      linux_common_clock_nanosleep(struct thread *, clockid_t,
                    l_int, struct timespec *, struct timespec *);

int
native_to_linux_timespec(struct l_timespec *ltp, struct timespec *ntp)
{

#ifdef COMPAT_LINUX32
        if (ntp->tv_sec > INT_MAX || ntp->tv_sec < INT_MIN)
                return (EOVERFLOW);
#endif
        ltp->tv_sec = ntp->tv_sec;
        ltp->tv_nsec = ntp->tv_nsec;

        return (0);
}

int
linux_to_native_timespec(struct timespec *ntp, struct l_timespec *ltp)
{

        if (!timespecvalid_interval(ltp))
                return (EINVAL);
        ntp->tv_sec = ltp->tv_sec;
        ntp->tv_nsec = ltp->tv_nsec;

        return (0);
}

int
linux_put_timespec(struct timespec *ntp, struct l_timespec *ltp)
{
        struct l_timespec lts;
        int error;

        error = native_to_linux_timespec(&lts, ntp);
        if (error != 0)
                return (error);
        return (copyout(&lts, ltp, sizeof(lts)));
}

int
linux_get_timespec(struct timespec *ntp, const struct l_timespec *ultp)
{
        struct l_timespec lts;
        int error;

        error = copyin(ultp, &lts, sizeof(lts));
        if (error != 0)
                return (error);
        return (linux_to_native_timespec(ntp, &lts));
}

#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
int
native_to_linux_timespec64(struct l_timespec64 *ltp64, struct timespec *ntp)
{

        ltp64->tv_sec = ntp->tv_sec;
        ltp64->tv_nsec = ntp->tv_nsec;

        return (0);
}

int
linux_to_native_timespec64(struct timespec *ntp, struct l_timespec64 *ltp64)
{

#if defined(__i386__)
        /* i386 time_t is still 32-bit */
        if (ltp64->tv_sec > INT_MAX || ltp64->tv_sec < INT_MIN)
                return (EOVERFLOW);
#endif
        /* Zero out the padding in compat mode. */
        ntp->tv_nsec = ltp64->tv_nsec & 0xFFFFFFFFUL;
        ntp->tv_sec = ltp64->tv_sec;

        if (!timespecvalid_interval(ntp))
                return (EINVAL);

        return (0);
}

int
linux_put_timespec64(struct timespec *ntp, struct l_timespec64 *ltp)
{
        struct l_timespec64 lts;
        int error;

        error = native_to_linux_timespec64(&lts, ntp);
        if (error != 0)
                return (error);
        return (copyout(&lts, ltp, sizeof(lts)));
}

int
linux_get_timespec64(struct timespec *ntp, const struct l_timespec64 *ultp)
{
        struct l_timespec64 lts;
        int error;

        error = copyin(ultp, &lts, sizeof(lts));
        if (error != 0)
                return (error);
        return (linux_to_native_timespec64(ntp, &lts));
}
#endif

int
native_to_linux_itimerspec(struct l_itimerspec *ltp, struct itimerspec *ntp)
{
        int error;

        error = native_to_linux_timespec(&ltp->it_interval, &ntp->it_interval);
        if (error == 0)
                error = native_to_linux_timespec(&ltp->it_value, &ntp->it_value);
        return (error);
}

int
linux_to_native_itimerspec(struct itimerspec *ntp, struct l_itimerspec *ltp)
{
        int error;

        error = linux_to_native_timespec(&ntp->it_interval, &ltp->it_interval);
        if (error == 0)
                error = linux_to_native_timespec(&ntp->it_value, &ltp->it_value);
        return (error);
}

#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
int
linux_to_native_itimerspec64(struct itimerspec *ntp, struct l_itimerspec64 *ltp)
{
        int error;

        error = linux_to_native_timespec64(&ntp->it_interval, &ltp->it_interval);
        if (error == 0)
                error = linux_to_native_timespec64(&ntp->it_value, &ltp->it_value);
        return (error);
}

int
native_to_linux_itimerspec64(struct l_itimerspec64 *ltp, struct itimerspec *ntp)
{
        int error;

        error = native_to_linux_timespec64(&ltp->it_interval, &ntp->it_interval);
        if (error == 0)
                error = native_to_linux_timespec64(&ltp->it_value, &ntp->it_value);
        return (error);
}
#endif

int
linux_to_native_clockid(clockid_t *n, clockid_t l)
{

        if (l < 0) {
                /* cpu-clock */
                if (LINUX_CPUCLOCK_WHICH(l) == LINUX_CLOCKFD) {
                        LIN_SDT_PROBE1(time, linux_to_native_clockid,
                            unsupported_clockid, l);
                        return (ENOTSUP);
                }
                if ((l & LINUX_CLOCKFD_MASK) == LINUX_CLOCKFD_MASK)
                        return (EINVAL);

                if (LINUX_CPUCLOCK_PERTHREAD(l))
                        *n = CLOCK_THREAD_CPUTIME_ID;
                else
                        *n = CLOCK_PROCESS_CPUTIME_ID;
                return (0);
        }

        switch (l) {
        case LINUX_CLOCK_REALTIME:
                *n = CLOCK_REALTIME;
                break;
        case LINUX_CLOCK_MONOTONIC:
                *n = CLOCK_UPTIME;
                break;
        case LINUX_CLOCK_PROCESS_CPUTIME_ID:
                *n = CLOCK_PROCESS_CPUTIME_ID;
                break;
        case LINUX_CLOCK_THREAD_CPUTIME_ID:
                *n = CLOCK_THREAD_CPUTIME_ID;
                break;
        case LINUX_CLOCK_REALTIME_COARSE:
                *n = CLOCK_REALTIME_FAST;
                break;
        case LINUX_CLOCK_MONOTONIC_COARSE:
        case LINUX_CLOCK_MONOTONIC_RAW:
                *n = CLOCK_UPTIME_FAST;
                break;
        case LINUX_CLOCK_BOOTTIME:
                *n = CLOCK_MONOTONIC;
                break;
        case LINUX_CLOCK_REALTIME_ALARM:
        case LINUX_CLOCK_BOOTTIME_ALARM:
        case LINUX_CLOCK_SGI_CYCLE:
        case LINUX_CLOCK_TAI:
                LIN_SDT_PROBE1(time, linux_to_native_clockid,
                    unsupported_clockid, l);
                return (ENOTSUP);
        default:
                LIN_SDT_PROBE1(time, linux_to_native_clockid,
                    unknown_clockid, l);
                return (ENOTSUP);
        }

        return (0);
}

int
linux_to_native_timerflags(int *nflags, int flags)
{

        if (flags & ~LINUX_TIMER_ABSTIME)
                return (EINVAL);
        *nflags = 0;
        if (flags & LINUX_TIMER_ABSTIME)
                *nflags |= TIMER_ABSTIME;
        return (0);
}

static int
linux_common_clock_gettime(struct thread *td, clockid_t which,
    struct timespec *tp)
{
        struct rusage ru;
        struct thread *targettd;
        struct proc *p;
        int error, clockwhich;
        clockid_t nwhich;
        pid_t pid;
        lwpid_t tid;

        error = linux_to_native_clockid(&nwhich, which);
        if (error != 0) {
                linux_msg(curthread,
                    "unsupported clock_gettime clockid %d", which);
                LIN_SDT_PROBE1(time, linux_common_clock_gettime,
                    conversion_error, error);
                return (error);
        }

        switch (nwhich) {
        case CLOCK_PROCESS_CPUTIME_ID:
                if (which < 0) {
                        clockwhich = LINUX_CPUCLOCK_WHICH(which);
                        pid = LINUX_CPUCLOCK_ID(which);
                } else {
                        clockwhich = LINUX_CPUCLOCK_SCHED;
                        pid = 0;
                }
                if (pid == 0) {
                        p = td->td_proc;
                        PROC_LOCK(p);
                } else {
                        error = pget(pid, PGET_CANSEE, &p);
                        if (error != 0)
                                return (EINVAL);
                }
                switch (clockwhich) {
                case LINUX_CPUCLOCK_PROF:
                        PROC_STATLOCK(p);
                        calcru(p, &ru.ru_utime, &ru.ru_stime);
                        PROC_STATUNLOCK(p);
                        PROC_UNLOCK(p);
                        timevaladd(&ru.ru_utime, &ru.ru_stime);
                        TIMEVAL_TO_TIMESPEC(&ru.ru_utime, tp);
                        break;
                case LINUX_CPUCLOCK_VIRT:
                        PROC_STATLOCK(p);
                        calcru(p, &ru.ru_utime, &ru.ru_stime);
                        PROC_STATUNLOCK(p);
                        PROC_UNLOCK(p);
                        TIMEVAL_TO_TIMESPEC(&ru.ru_utime, tp);
                        break;
                case LINUX_CPUCLOCK_SCHED:
                        kern_process_cputime(p, tp);
                        PROC_UNLOCK(p);
                        break;
                default:
                        PROC_UNLOCK(p);
                        return (EINVAL);
                }

                break;

        case CLOCK_THREAD_CPUTIME_ID:
                if (which < 0) {
                        clockwhich = LINUX_CPUCLOCK_WHICH(which);
                        tid = LINUX_CPUCLOCK_ID(which);
                } else {
                        clockwhich = LINUX_CPUCLOCK_SCHED;
                        tid = 0;
                }
                p = td->td_proc;
                if (tid == 0) {
                        targettd = td;
                        PROC_LOCK(p);
                } else {
                        targettd = linux_tdfind(td, tid, p->p_pid);
                        if (targettd == NULL)
                                return (EINVAL);
                }
                switch (clockwhich) {
                case LINUX_CPUCLOCK_PROF:
                        PROC_STATLOCK(p);
                        thread_lock(targettd);
                        rufetchtd(targettd, &ru);
                        thread_unlock(targettd);
                        PROC_STATUNLOCK(p);
                        PROC_UNLOCK(p);
                        timevaladd(&ru.ru_utime, &ru.ru_stime);
                        TIMEVAL_TO_TIMESPEC(&ru.ru_utime, tp);
                        break;
                case LINUX_CPUCLOCK_VIRT:
                        PROC_STATLOCK(p);
                        thread_lock(targettd);
                        rufetchtd(targettd, &ru);
                        thread_unlock(targettd);
                        PROC_STATUNLOCK(p);
                        PROC_UNLOCK(p);
                        TIMEVAL_TO_TIMESPEC(&ru.ru_utime, tp);
                        break;
                case LINUX_CPUCLOCK_SCHED:
                        if (td == targettd)
                                targettd = NULL;
                        kern_thread_cputime(targettd, tp);
                        PROC_UNLOCK(p);
                        break;
                default:
                        PROC_UNLOCK(p);
                        return (EINVAL);
                }
                break;

        default:
                error = kern_clock_gettime(td, nwhich, tp);
                break;
        }

        return (error);
}

int
linux_clock_gettime(struct thread *td, struct linux_clock_gettime_args *args)
{
        struct timespec tp;
        int error;

        error = linux_common_clock_gettime(td, args->which, &tp);
        if (error != 0) {
                LIN_SDT_PROBE1(time, linux_clock_gettime, gettime_error, error);
                return (error);
        }
        error = linux_put_timespec(&tp, args->tp);
        if (error != 0)
                LIN_SDT_PROBE1(time, linux_clock_gettime, copyout_error, error);

        return (error);
}

#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
int
linux_clock_gettime64(struct thread *td, struct linux_clock_gettime64_args *args)
{
        struct timespec tp;
        int error;

        error = linux_common_clock_gettime(td, args->which, &tp);
        if (error != 0) {
                LIN_SDT_PROBE1(time, linux_clock_gettime64, gettime_error, error);
                return (error);
        }
        error = linux_put_timespec64(&tp, args->tp);
        if (error != 0)
                LIN_SDT_PROBE1(time, linux_clock_gettime64, copyout_error, error);

        return (error);
}
#endif

static int
linux_common_clock_settime(struct thread *td, clockid_t which,
    struct timespec *ts)
{
        int error;
        clockid_t nwhich;

        error = linux_to_native_clockid(&nwhich, which);
        if (error != 0) {
                linux_msg(curthread,
                    "unsupported clock_settime clockid %d", which);
                LIN_SDT_PROBE1(time, linux_common_clock_settime, conversion_error,
                    error);
                return (error);
        }

        error = kern_clock_settime(td, nwhich, ts);
        if (error != 0)
                LIN_SDT_PROBE1(time, linux_common_clock_settime,
                    settime_error, error);

        return (error);
}

int
linux_clock_settime(struct thread *td, struct linux_clock_settime_args *args)
{
        struct timespec ts;
        int error;

        error = linux_get_timespec(&ts, args->tp);
        if (error != 0) {
                LIN_SDT_PROBE1(time, linux_clock_settime, copyin_error, error);
                return (error);
        }
        return (linux_common_clock_settime(td, args->which, &ts));
}

#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
int
linux_clock_settime64(struct thread *td, struct linux_clock_settime64_args *args)
{
        struct timespec ts;
        int error;

        error = linux_get_timespec64(&ts, args->tp);
        if (error != 0) {
                LIN_SDT_PROBE1(time, linux_clock_settime64, copyin_error, error);
                return (error);
        }
        return (linux_common_clock_settime(td, args->which, &ts));
}
#endif

static int
linux_common_clock_getres(struct thread *td, clockid_t which,
    struct timespec *ts)
{
        struct proc *p;
        int error, clockwhich;
        clockid_t nwhich;
        pid_t pid;
        lwpid_t tid;

        error = linux_to_native_clockid(&nwhich, which);
        if (error != 0) {
                linux_msg(curthread,
                    "unsupported clock_getres clockid %d", which);
                LIN_SDT_PROBE1(time, linux_common_clock_getres,
                    conversion_error, error);
                return (error);
        }

        /*
         * Check user supplied clock id in case of per-process
         * or thread-specific cpu-time clock.
         */
        if (which < 0) {
                switch (nwhich) {
                case CLOCK_THREAD_CPUTIME_ID:
                        tid = LINUX_CPUCLOCK_ID(which);
                        if (tid != 0) {
                                p = td->td_proc;
                                if (linux_tdfind(td, tid, p->p_pid) == NULL)
                                        return (EINVAL);
                                PROC_UNLOCK(p);
                        }
                        break;
                case CLOCK_PROCESS_CPUTIME_ID:
                        pid = LINUX_CPUCLOCK_ID(which);
                        if (pid != 0) {
                                error = pget(pid, PGET_CANSEE, &p);
                                if (error != 0)
                                        return (EINVAL);
                                PROC_UNLOCK(p);
                        }
                        break;
                }
        }

        if (ts == NULL) {
                LIN_SDT_PROBE0(time, linux_common_clock_getres, nullcall);
                return (0);
        }

        switch (nwhich) {
        case CLOCK_THREAD_CPUTIME_ID:
        case CLOCK_PROCESS_CPUTIME_ID:
                clockwhich = LINUX_CPUCLOCK_WHICH(which);
                /*
                 * In both cases (when the clock id obtained by a call to
                 * clock_getcpuclockid() or using the clock
                 * ID CLOCK_PROCESS_CPUTIME_ID Linux hardcodes precision
                 * of clock. The same for the CLOCK_THREAD_CPUTIME_ID clock.
                 *
                 * See Linux posix_cpu_clock_getres() implementation.
                 */
                if (which > 0 || clockwhich == LINUX_CPUCLOCK_SCHED) {
                        ts->tv_sec = 0;
                        ts->tv_nsec = 1;
                        goto out;
                }

                switch (clockwhich) {
                case LINUX_CPUCLOCK_PROF:
                        nwhich = CLOCK_PROF;
                        break;
                case LINUX_CPUCLOCK_VIRT:
                        nwhich = CLOCK_VIRTUAL;
                        break;
                default:
                        return (EINVAL);
                }
                break;

        default:
                break;
        }
        error = kern_clock_getres(td, nwhich, ts);
        if (error != 0) {
                LIN_SDT_PROBE1(time, linux_common_clock_getres,
                    getres_error, error);
                return (error);
        }

out:
        return (error);
}

int
linux_clock_getres(struct thread *td,
    struct linux_clock_getres_args *args)
{
        struct timespec ts;
        int error;

        error = linux_common_clock_getres(td, args->which, &ts);
        if (error != 0 || args->tp == NULL)
                return (error);
        error = linux_put_timespec(&ts, args->tp);
        if (error != 0)
                LIN_SDT_PROBE1(time, linux_clock_getres,
                    copyout_error, error);
        return (error);
}

#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
int
linux_clock_getres_time64(struct thread *td,
    struct linux_clock_getres_time64_args *args)
{
        struct timespec ts;
        int error;

        error = linux_common_clock_getres(td, args->which, &ts);
        if (error != 0 || args->tp == NULL)
                return (error);
        error = linux_put_timespec64(&ts, args->tp);
        if (error != 0)
                LIN_SDT_PROBE1(time, linux_clock_getres_time64,
                    copyout_error, error);
        return (error);
}
#endif

int
linux_nanosleep(struct thread *td, struct linux_nanosleep_args *args)
{
        struct timespec *rmtp;
        struct timespec rqts, rmts;
        int error, error2;

        error = linux_get_timespec(&rqts, args->rqtp);
        if (error != 0) {
                LIN_SDT_PROBE1(time, linux_nanosleep, copyin_error, error);
                return (error);
        }
        if (args->rmtp != NULL)
                rmtp = &rmts;
        else
                rmtp = NULL;

        error = kern_nanosleep(td, &rqts, rmtp);
        if (error == EINTR && args->rmtp != NULL) {
                error2 = linux_put_timespec(rmtp, args->rmtp);
                if (error2 != 0) {
                        LIN_SDT_PROBE1(time, linux_nanosleep, copyout_error,
                            error2);
                        return (error2);
                }
        }

        return (error);
}

static int
linux_common_clock_nanosleep(struct thread *td, clockid_t which,
    l_int lflags, struct timespec *rqtp, struct timespec *rmtp)
{
        int error, flags;
        clockid_t clockid;

        error = linux_to_native_timerflags(&flags, lflags);
        if (error != 0) {
                LIN_SDT_PROBE1(time, linux_common_clock_nanosleep,
                    unsupported_flags, lflags);
                return (error);
        }

        error = linux_to_native_clockid(&clockid, which);
        if (error != 0) {
                linux_msg(curthread,
                    "unsupported clock_nanosleep clockid %d", which);
                LIN_SDT_PROBE1(time, linux_common_clock_nanosleep,
                    unsupported_clockid, which);
                return (error);
        }
        if (clockid == CLOCK_THREAD_CPUTIME_ID)
                return (ENOTSUP);

        return (kern_clock_nanosleep(td, clockid, flags, rqtp, rmtp));
}

int
linux_clock_nanosleep(struct thread *td,
    struct linux_clock_nanosleep_args *args)
{
        struct timespec *rmtp;
        struct timespec rqts, rmts;
        int error, error2;

        error = linux_get_timespec(&rqts, args->rqtp);
        if (error != 0) {
                LIN_SDT_PROBE1(time, linux_clock_nanosleep, copyin_error,
                    error);
                return (error);
        }
        if (args->rmtp != NULL)
                rmtp = &rmts;
        else
                rmtp = NULL;

        error = linux_common_clock_nanosleep(td, args->which, args->flags,
            &rqts, rmtp);
        if (error == EINTR && (args->flags & LINUX_TIMER_ABSTIME) == 0 &&
            args->rmtp != NULL) {
                error2 = linux_put_timespec(rmtp, args->rmtp);
                if (error2 != 0) {
                        LIN_SDT_PROBE1(time, linux_clock_nanosleep,
                            copyout_error, error2);
                        return (error2);
                }
        }
        return (error);
}

#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
int
linux_clock_nanosleep_time64(struct thread *td,
    struct linux_clock_nanosleep_time64_args *args)
{
        struct timespec *rmtp;
        struct timespec rqts, rmts;
        int error, error2;

        error = linux_get_timespec64(&rqts, args->rqtp);
        if (error != 0) {
                LIN_SDT_PROBE1(time, linux_clock_nanosleep_time64,
                    copyin_error, error);
                return (error);
        }
        if (args->rmtp != NULL)
                rmtp = &rmts;
        else
                rmtp = NULL;

        error = linux_common_clock_nanosleep(td, args->which, args->flags,
            &rqts, rmtp);
        if (error == EINTR && (args->flags & LINUX_TIMER_ABSTIME) == 0 &&
            args->rmtp != NULL) {
                error2 = linux_put_timespec64(rmtp, args->rmtp);
                if (error2 != 0) {
                        LIN_SDT_PROBE1(time, linux_clock_nanosleep_time64,
                            copyout_error, error2);
                        return (error2);
                }
        }
        return (error);
}
#endif