1/*	$NetBSD: linux_pipe.c,v 1.14 2011/04/14 01:03:23 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by 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 1.14 2011/04/14 01:03:23 christos 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#include <sys/proc.h>
43#include <sys/filedesc.h>
44#include <sys/fcntl.h>
45
46#include <sys/syscallargs.h>
47
48#include <compat/linux/common/linux_types.h>
49#include <compat/linux/common/linux_mmap.h>
50#include <compat/linux/common/linux_signal.h>
51#include <compat/linux/common/linux_fcntl.h>
52
53#include <compat/linux/linux_syscallargs.h>
54
55/*
56 * The Alpha version of sys_pipe.
57 *
58 * Linux returns fd[1] in a4
59 * and fd[0] in the retval[0].
60 */
61
62
63int
64linux_sys_pipe(struct lwp *l, const void *v, register_t *retval)
65{
66	int error;
67
68	if ((error = pipe1(l, retval, 0)))
69		return error;
70
71	(l->l_md.md_tf)->tf_regs[FRAME_A4] = retval[1];
72	return 0;
73}
74
75int
76linux_sys_pipe2(struct lwp *l, const struct linux_sys_pipe2_args *uap,
77    register_t *retval)
78{
79	/* {
80		syscallarg(int *) pfds;
81		syscallarg(int) flags;
82	} */
83	int error;
84	int flag = 0;
85
86	switch (SCARG(uap, flags)) {
87	case LINUX_O_CLOEXEC:
88		break;
89	case LINUX_O_NONBLOCK:
90	case LINUX_O_NONBLOCK|LINUX_O_CLOEXEC:
91		flag = O_NONBLOCK;
92		break;
93	default:
94		return EINVAL;
95	}
96
97	if ((error = pipe1(l, retval, flag)))
98		return error;
99
100	(l->l_md.md_tf)->tf_regs[FRAME_A4] = retval[1];
101
102	if (SCARG(uap, flags) & LINUX_O_CLOEXEC) {
103		fd_set_exclose(l, retval[0], true);
104		fd_set_exclose(l, retval[1], true);
105	}
106	return 0;
107}
108