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_
47typedef _BSD_SIZE_T_ size_t;
48#undef _BSD_SIZE_T_
49#endif
50
51#ifdef _BSD_SSIZE_T_
52typedef _BSD_SSIZE_T_ ssize_t;
53#undef _BSD_SSIZE_T_
54#endif
55
56struct 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
65typedef __off_t off_t; /* file offset */
66#define off_t __off_t
67#endif
68
69enum uio_rw { UIO_READ, UIO_WRITE };
70
71/* Segment flag values. */
72enum uio_seg {
73 UIO_USERSPACE, /* from user data space */
74 UIO_SYSSPACE /* from system space */
75};
76
77#ifdef __UIO_EXPOSE
78
79struct vmspace;
80
81struct 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
105void 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)
113ssize_t preadv(int, const struct iovec *, int, off_t);
114ssize_t pwritev(int, const struct iovec *, int, off_t);
115#endif /* _NETBSD_SOURCE */
116ssize_t readv(int, const struct iovec *, int);
117ssize_t writev(int, const struct iovec *, int);
118__END_DECLS
119#else
120int ureadc(int, struct uio *);
121#endif /* !_KERNEL */
122
123#endif /* !_SYS_UIO_H_ */
124