linux_pipe.c revision 1.62 
1/*	$NetBSD: linux_pipe.c,v 1.62 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_pipe.c,v 1.62 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/malloc.h>
39#include <sys/mbuf.h>
40#include <sys/mman.h>
41#include <sys/mount.h>
42
43#include <sys/syscallargs.h>
44
45#include <compat/linux/common/linux_types.h>
46#include <compat/linux/common/linux_mmap.h>
47#include <compat/linux/common/linux_signal.h>
48#include <compat/linux/common/linux_ipc.h>
49#include <compat/linux/common/linux_sem.h>
50
51#include <compat/linux/linux_syscallargs.h>
52
53/* Used on: arm, i386, m68k, ppc, amd64 */
54/* Not used on: alpha, mips, sparc, sparc64 */
55/* Alpha, mips, sparc and sparc64 pass one of the fds in a register */
56
57/*
58 * NetBSD passes fd[0] in retval[0], and fd[1] in retval[1].
59 * Linux directly passes the pointer.
60 */
61int
62linux_sys_pipe(struct lwp *l, const struct linux_sys_pipe_args *uap, register_t *retval)
63{
64	/* {
65		syscallarg(int *) pfds;
66	} */
67	int error;
68#ifdef __amd64__
69	int pfds[2];
70#endif
71
72	if ((error = sys_pipe(l, 0, retval)))
73		return error;
74
75#ifndef __amd64__
76	/* Assumes register_t is an int */
77	if ((error = copyout(retval, SCARG(uap, pfds), 2 * sizeof (int))))
78		return error;
79#else
80	/* On amd64, sizeof(register_t) != sizeof(int) */
81	pfds[0] = (int)retval[0];
82	pfds[1] = (int)retval[1];
83
84	if ((error = copyout(pfds, SCARG(uap, pfds), sizeof(pfds))))
85		return error;
86#endif
87
88	retval[0] = 0;
89	return 0;
90}
91