linux_pipe.c revision 1.61 
1/*	$NetBSD: linux_pipe.c,v 1.61 2007/12/20 23:02:56 dsl 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 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the NetBSD
21 *	Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40__KERNEL_RCSID(0, "$NetBSD: linux_pipe.c,v 1.61 2007/12/20 23:02:56 dsl Exp $");
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/kernel.h>
45#include <sys/malloc.h>
46#include <sys/mbuf.h>
47#include <sys/mman.h>
48#include <sys/mount.h>
49
50#include <sys/syscallargs.h>
51
52#include <compat/linux/common/linux_types.h>
53#include <compat/linux/common/linux_mmap.h>
54#include <compat/linux/common/linux_signal.h>
55#include <compat/linux/common/linux_ipc.h>
56#include <compat/linux/common/linux_sem.h>
57
58#include <compat/linux/linux_syscallargs.h>
59
60/* Used on: arm, i386, m68k, ppc, amd64 */
61/* Not used on: alpha, mips, sparc, sparc64 */
62/* Alpha, mips, sparc and sparc64 pass one of the fds in a register */
63
64/*
65 * NetBSD passes fd[0] in retval[0], and fd[1] in retval[1].
66 * Linux directly passes the pointer.
67 */
68int
69linux_sys_pipe(struct lwp *l, const struct linux_sys_pipe_args *uap, register_t *retval)
70{
71	/* {
72		syscallarg(int *) pfds;
73	} */
74	int error;
75#ifdef __amd64__
76	int pfds[2];
77#endif
78
79	if ((error = sys_pipe(l, 0, retval)))
80		return error;
81
82#ifndef __amd64__
83	/* Assumes register_t is an int */
84	if ((error = copyout(retval, SCARG(uap, pfds), 2 * sizeof (int))))
85		return error;
86#else
87	/* On amd64, sizeof(register_t) != sizeof(int) */
88	pfds[0] = (int)retval[0];
89	pfds[1] = (int)retval[1];
90
91	if ((error = copyout(pfds, SCARG(uap, pfds), sizeof(pfds))))
92		return error;
93#endif
94
95	retval[0] = 0;
96	return 0;
97}
98