/*      $NetBSD: linux_llseek.c,v 1.35 2021/09/23 06:56:27 ryo Exp $    */

/*-
* Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden and Eric Haszlakiewicz.
*
* 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>
__KERNEL_RCSID(0, "$NetBSD: linux_llseek.c,v 1.35 2021/09/23 06:56:27 ryo Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/conf.h>

#include <sys/sched.h>
#include <sys/syscallargs.h>

#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_fcntl.h>
#include <compat/linux/common/linux_util.h>

#include <compat/linux/linux_syscallargs.h>

/* Used on: arm, i386, m68k, mips, ppc, sparc */
/* Not used on: aarch64, alpha, sparc64 */

/*
* This appears to be part of a Linux attempt to switch to 64 bits file sizes.
*/
int
linux_sys_llseek(struct lwp *l, const struct linux_sys_llseek_args *uap, register_t *retval)
{
       /* {
               syscallarg(int) fd;
               syscallarg(uint32_t) ohigh;
               syscallarg(uint32_t) olow;
               syscallarg(void *) res;
               syscallarg(int) whence;
       } */
       struct sys_lseek_args bla;
       int error;
       off_t off;

       off = SCARG(uap, olow) | (((off_t) SCARG(uap, ohigh)) << 32);

       SCARG(&bla, fd) = SCARG(uap, fd);
       SCARG(&bla, offset) = off;
       SCARG(&bla, whence) = SCARG(uap, whence);

       if ((error = sys_lseek(l, &bla, retval)))
               return error;

       if ((error = copyout(retval, SCARG(uap, res), sizeof (off_t))))
               return error;

       retval[0] = 0;
       return 0;
}