NetBSD-5.0.2/sys/compat/darwin/darwin_unistd.c

/*	$NetBSD: darwin_unistd.c,v 1.11 2008/04/28 20:23:41 martin Exp $ */

/*-
 * Copyright (c) 2003 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>
__KERNEL_RCSID(0, "$NetBSD: darwin_unistd.c,v 1.11 2008/04/28 20:23:41 martin Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/endian.h>
#include <sys/syscallargs.h>

#include <compat/sys/signal.h>

#include <compat/mach/mach_types.h>
#include <compat/mach/mach_vm.h>

#include <compat/darwin/darwin_audit.h>
#include <compat/darwin/darwin_syscallargs.h>

int
darwin_sys_lseek(struct lwp *l, const struct darwin_sys_lseek_args *uap, register_t *retval)
{
	struct sys_lseek_args cup;
	union {
		off_t o;
		u_long l[2];
	} off;

	SCARG(&cup, fd) = SCARG(uap, fd);
	SCARG(&cup, whence) = SCARG(uap, whence);

	/*
	 * NetBSD pads the syscallarg structure because of the
	 * off_t argument, Darwin does not. In order to get the off_t
	 * argument going through our syscall machinery, we declare
	 * it as two long arguments, and we reassemble them here.
	 */
	off.l[_QUAD_LOWWORD] = (u_long)SCARG(uap, off2);
	off.l[_QUAD_HIGHWORD] = (u_long)SCARG(uap, off1);

	SCARG(&cup, offset) = off.o;

	return sys_lseek(l, &cup, retval);
}