sys/compat/linux/common/linux_llseek.c

   1 /*      $NetBSD: linux_llseek.c,v 1.32 2008/04/28 20:23:43 martin Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Frank van der Linden and Eric Haszlakiewicz.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: linux_llseek.c,v 1.32 2008/04/28 20:23:43 martin Exp $");
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/mount.h>
  39 #include <sys/malloc.h>
  40 #include <sys/conf.h>
  41
  42 #include <sys/sched.h>
  43 #include <sys/syscallargs.h>
  44
  45 #include <compat/linux/common/linux_types.h>
  46 #include <compat/linux/common/linux_signal.h>
  47 #include <compat/linux/common/linux_fcntl.h>
  48 #include <compat/linux/common/linux_util.h>
  49
  50 #include <compat/linux/linux_syscallargs.h>
  51
  52 /* Used on: arm, i386, m68k, mips, ppc, sparc */
  53 /* Not used on: alpha, sparc64 */
  54
  55 /*
  56  * This appears to be part of a Linux attempt to switch to 64 bits file sizes.
  57  */
  58 int
  59 linux_sys_llseek(struct lwp *l, const struct linux_sys_llseek_args *uap, register_t *retval)
  60 {
  61         /* {
  62                 syscallarg(int) fd;
  63                 syscallarg(uint32_t) ohigh;
  64                 syscallarg(uint32_t) olow;
  65                 syscallarg(void *) res;
  66                 syscallarg(int) whence;
  67         } */
  68         struct sys_lseek_args bla;
  69         int error;
  70         off_t off;
  71
  72         off = SCARG(uap, olow) | (((off_t) SCARG(uap, ohigh)) << 32);
  73
  74         SCARG(&bla, fd) = SCARG(uap, fd);
  75         SCARG(&bla, offset) = off;
  76         SCARG(&bla, whence) = SCARG(uap, whence);
  77
  78         if ((error = sys_lseek(l, &bla, retval)))
  79                 return error;
  80
  81         if ((error = copyout(retval, SCARG(uap, res), sizeof (off_t))))
  82                 return error;
  83
  84         retval[0] = 0;
  85         return 0;
  86 }