1 | /* $NetBSD: linux_pipe.c,v 1.67 2014/11/09 17:48:08 maxv 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 1.67 2014/11/09 17:48:08 maxv Exp $" ); |
34 | |
35 | #include <sys/param.h> |
36 | #include <sys/systm.h> |
37 | #include <sys/kernel.h> |
38 | #include <sys/mbuf.h> |
39 | #include <sys/mman.h> |
40 | #include <sys/mount.h> |
41 | #include <sys/fcntl.h> |
42 | #include <sys/filedesc.h> |
43 | |
44 | #include <sys/sched.h> |
45 | #include <sys/syscallargs.h> |
46 | |
47 | #include <compat/linux/common/linux_types.h> |
48 | #include <compat/linux/common/linux_mmap.h> |
49 | #include <compat/linux/common/linux_signal.h> |
50 | #include <compat/linux/common/linux_ipc.h> |
51 | #include <compat/linux/common/linux_sem.h> |
52 | #include <compat/linux/common/linux_fcntl.h> |
53 | |
54 | #include <compat/linux/linux_syscallargs.h> |
55 | |
56 | /* Used on: arm, i386, m68k, ppc, amd64 */ |
57 | /* Not used on: alpha, mips, sparc, sparc64 */ |
58 | /* Alpha, mips, sparc and sparc64 pass one of the fds in a register */ |
59 | |
60 | /* |
61 | * NetBSD passes fd[0] in retval[0], and fd[1] in retval[1]. |
62 | * Linux directly passes the pointer. |
63 | */ |
64 | static int |
65 | linux_pipe_return(struct lwp *l, int *pfds, register_t *retval) |
66 | { |
67 | int error; |
68 | |
69 | if (sizeof(*retval) != sizeof(*pfds)) { |
70 | /* On amd64, sizeof(register_t) != sizeof(int) */ |
71 | int rpfds[2]; |
72 | rpfds[0] = (int)retval[0]; |
73 | rpfds[1] = (int)retval[1]; |
74 | |
75 | if ((error = copyout(rpfds, pfds, sizeof(rpfds)))) |
76 | return error; |
77 | } else { |
78 | if ((error = copyout(retval, pfds, 2 * sizeof(*pfds)))) |
79 | return error; |
80 | } |
81 | retval[0] = 0; |
82 | return 0; |
83 | } |
84 | |
85 | int |
86 | linux_sys_pipe(struct lwp *l, const struct linux_sys_pipe_args *uap, |
87 | register_t *retval) |
88 | { |
89 | /* { |
90 | syscallarg(int *) pfds; |
91 | } */ |
92 | int error; |
93 | |
94 | if ((error = pipe1(l, retval, 0))) |
95 | return error; |
96 | |
97 | return linux_pipe_return(l, SCARG(uap, pfds), retval); |
98 | } |
99 | |
100 | int |
101 | linux_sys_pipe2(struct lwp *l, const struct linux_sys_pipe2_args *uap, |
102 | register_t *retval) |
103 | { |
104 | /* { |
105 | syscallarg(int *) pfds; |
106 | syscallarg(int) flags; |
107 | } */ |
108 | int error, flags; |
109 | |
110 | flags = linux_to_bsd_ioflags(SCARG(uap, flags)); |
111 | if ((flags & ~(O_CLOEXEC|O_NONBLOCK)) != 0) |
112 | return EINVAL; |
113 | |
114 | if ((error = pipe1(l, retval, flags))) |
115 | return error; |
116 | |
117 | return linux_pipe_return(l, SCARG(uap, pfds), retval); |
118 | } |
119 | |