linux_pipe.c revision 1.59 
1/*	$NetBSD: linux_pipe.c,v 1.59 2007/10/19 18:52:11 njoly 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 1.59 2007/10/19 18:52:11 njoly 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(l, v, retval)
70	struct lwp *l;
71	void *v;
72	register_t *retval;
73{
74	struct linux_sys_pipe_args /* {
75		syscallarg(int *) pfds;
76	} */ *uap = v;
77	int error;
78#ifdef __amd64__
79	int pfds[2];
80#endif
81
82	if ((error = sys_pipe(l, 0, retval)))
83		return error;
84
85#ifndef __amd64__
86	/* Assumes register_t is an int */
87	if ((error = copyout(retval, SCARG(uap, pfds), 2 * sizeof (int))))
88		return error;
89#else
90	/* On amd64, sizeof(register_t) != sizeof(int) */
91	pfds[0] = (int)retval[0];
92	pfds[1] = (int)retval[1];
93
94	if ((error = copyout(pfds, SCARG(uap, pfds), sizeof(pfds))))
95		return error;
96#endif
97
98	retval[0] = 0;
99	return 0;
100}
101