1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/* $NetBSD: linux_pipe.c,v 1.65 2011/04/14 00:59:06 christos Exp $ */
/*-
* Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden and Eric Haszlakiewicz.
*
* 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: linux_pipe.c,v 1.65 2011/04/14 00:59:06 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/fcntl.h>
#include <sys/filedesc.h>
#include <sys/sched.h>
#include <sys/syscallargs.h>
#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_mmap.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_ipc.h>
#include <compat/linux/common/linux_sem.h>
#include <compat/linux/common/linux_fcntl.h>
#include <compat/linux/linux_syscallargs.h>
/* Used on: arm, i386, m68k, ppc, amd64 */
/* Not used on: alpha, mips, sparc, sparc64 */
/* Alpha, mips, sparc and sparc64 pass one of the fds in a register */
/*
* NetBSD passes fd[0] in retval[0], and fd[1] in retval[1].
* Linux directly passes the pointer.
*/
static int
linux_pipe_return(struct lwp *l, int *pfds, register_t *retval, int flags)
{
int error;
if (sizeof(*retval) != sizeof(*pfds)) {
/* On amd64, sizeof(register_t) != sizeof(int) */
int rpfds[2];
rpfds[0] = (int)retval[0];
rpfds[1] = (int)retval[1];
if ((error = copyout(rpfds, pfds, sizeof(rpfds))))
return error;
} else {
if ((error = copyout(retval, pfds, 2 * sizeof(*pfds))))
return error;
}
if (flags & LINUX_O_CLOEXEC) {
fd_set_exclose(l, retval[0], true);
fd_set_exclose(l, retval[1], true);
}
retval[0] = 0;
return 0;
}
int
linux_sys_pipe(struct lwp *l, const struct linux_sys_pipe_args *uap,
register_t *retval)
{
/* {
syscallarg(int *) pfds;
} */
int error;
if ((error = pipe1(l, retval, 0)))
return error;
return linux_pipe_return(l, SCARG(uap, pfds), retval, 0);
}
int
linux_sys_pipe2(struct lwp *l, const struct linux_sys_pipe2_args *uap,
register_t *retval)
{
/* {
syscallarg(int *) pfds;
syscallarg(int) flags;
} */
int error;
int flag = 0;
switch (SCARG(uap, flags)) {
case LINUX_O_CLOEXEC:
break;
case LINUX_O_NONBLOCK:
case LINUX_O_NONBLOCK|LINUX_O_CLOEXEC:
flag = O_NONBLOCK;
break;
default:
return EINVAL;
}
if ((error = pipe1(l, retval, flag)))
return error;
return linux_pipe_return(l, SCARG(uap, pfds), retval,
SCARG(uap, flags));
}
|