1 | /* $NetBSD: uio.h,v 1.36 2011/07/27 13:20:07 uebayasi Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 1982, 1986, 1993, 1994 |
5 | * The Regents of the University of California. All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * 3. Neither the name of the University nor the names of its contributors |
16 | * may be used to endorse or promote products derived from this software |
17 | * without specific prior written permission. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
29 | * SUCH DAMAGE. |
30 | * |
31 | * @(#)uio.h 8.5 (Berkeley) 2/22/94 |
32 | */ |
33 | |
34 | #ifndef _SYS_UIO_H_ |
35 | #define _SYS_UIO_H_ |
36 | |
37 | #ifdef _KERNEL |
38 | #ifndef __UIO_EXPOSE |
39 | #define __UIO_EXPOSE |
40 | #endif |
41 | #endif |
42 | |
43 | #include <machine/ansi.h> |
44 | #include <sys/featuretest.h> |
45 | |
46 | #ifdef _BSD_SIZE_T_ |
47 | typedef _BSD_SIZE_T_ size_t; |
48 | #undef _BSD_SIZE_T_ |
49 | #endif |
50 | |
51 | #ifdef _BSD_SSIZE_T_ |
52 | typedef _BSD_SSIZE_T_ ssize_t; |
53 | #undef _BSD_SSIZE_T_ |
54 | #endif |
55 | |
56 | struct iovec { |
57 | void *iov_base; /* Base address. */ |
58 | size_t iov_len; /* Length. */ |
59 | }; |
60 | |
61 | #if defined(_NETBSD_SOURCE) |
62 | #include <sys/ansi.h> |
63 | |
64 | #ifndef off_t |
65 | typedef __off_t off_t; /* file offset */ |
66 | #define off_t __off_t |
67 | #endif |
68 | |
69 | enum uio_rw { UIO_READ, UIO_WRITE }; |
70 | |
71 | /* Segment flag values. */ |
72 | enum uio_seg { |
73 | UIO_USERSPACE, /* from user data space */ |
74 | UIO_SYSSPACE /* from system space */ |
75 | }; |
76 | |
77 | #ifdef __UIO_EXPOSE |
78 | |
79 | struct vmspace; |
80 | |
81 | struct uio { |
82 | struct iovec *uio_iov; /* pointer to array of iovecs */ |
83 | int uio_iovcnt; /* number of iovecs in array */ |
84 | off_t uio_offset; /* offset into file this uio corresponds to */ |
85 | size_t uio_resid; /* residual i/o count */ |
86 | enum uio_rw uio_rw; /* see above */ |
87 | struct vmspace *uio_vmspace; |
88 | }; |
89 | #define UIO_SETUP_SYSSPACE(uio) uio_setup_sysspace(uio) |
90 | |
91 | #endif /* __UIO_EXPOSE */ |
92 | |
93 | /* |
94 | * Limits |
95 | */ |
96 | /* Deprecated: use IOV_MAX from <limits.h> instead. */ |
97 | #define UIO_MAXIOV 1024 /* max 1K of iov's */ |
98 | #endif /* _NETBSD_SOURCE */ |
99 | |
100 | #ifdef _KERNEL |
101 | |
102 | /* 8 on stack, more will be dynamically allocated. */ |
103 | #define UIO_SMALLIOV 8 |
104 | |
105 | void uio_setup_sysspace(struct uio *); |
106 | #endif |
107 | |
108 | #ifndef _KERNEL |
109 | #include <sys/cdefs.h> |
110 | |
111 | __BEGIN_DECLS |
112 | #if defined(_NETBSD_SOURCE) |
113 | ssize_t preadv(int, const struct iovec *, int, off_t); |
114 | ssize_t pwritev(int, const struct iovec *, int, off_t); |
115 | #endif /* _NETBSD_SOURCE */ |
116 | ssize_t readv(int, const struct iovec *, int); |
117 | ssize_t writev(int, const struct iovec *, int); |
118 | __END_DECLS |
119 | #else |
120 | int ureadc(int, struct uio *); |
121 | #endif /* !_KERNEL */ |
122 | |
123 | #endif /* !_SYS_UIO_H_ */ |
124 | |