sys/compat/darwin/darwin_unistd.c

   1 /*      $NetBSD: darwin_unistd.c,v 1.10.8.2 2008/11/01 21:22:25 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Emmanuel Dreyfus.
   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: darwin_unistd.c,v 1.10.8.2 2008/11/01 21:22:25 christos Exp $");
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/proc.h>
  38 #include <sys/mount.h>
  39 #include <sys/endian.h>
  40 #include <sys/syscallargs.h>
  41
  42 #include <compat/sys/signal.h>
  43
  44 #include <compat/mach/mach_types.h>
  45 #include <compat/mach/mach_vm.h>
  46
  47 #include <compat/darwin/darwin_types.h>
  48 #include <compat/darwin/darwin_audit.h>
  49 #include <compat/darwin/darwin_syscallargs.h>
  50
  51 int
  52 darwin_sys_lseek(struct lwp *l, const struct darwin_sys_lseek_args *uap, register_t *retval)
  53 {
  54         struct sys_lseek_args cup;
  55         union {
  56                 off_t o;
  57                 u_long l[2];
  58         } off;
  59
  60         SCARG(&cup, fd) = SCARG(uap, fd);
  61         SCARG(&cup, whence) = SCARG(uap, whence);
  62
  63         /*
  64          * NetBSD pads the syscallarg structure because of the
  65          * off_t argument, Darwin does not. In order to get the off_t
  66          * argument going through our syscall machinery, we declare
  67          * it as two long arguments, and we reassemble them here.
  68          */
  69         off.l[_QUAD_LOWWORD] = (u_long)SCARG(uap, off2);
  70         off.l[_QUAD_HIGHWORD] = (u_long)SCARG(uap, off1);
  71
  72         SCARG(&cup, offset) = off.o;
  73
  74         return sys_lseek(l, &cup, retval);
  75 }