Initial import from FreeBSD RELENG_4:
[dragonfly.git] / sys / sys / uio.h
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MD
1/*
2 * Copyright (c) 1982, 1986, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)uio.h 8.5 (Berkeley) 2/22/94
34 * $FreeBSD: src/sys/sys/uio.h,v 1.11.2.1 2001/09/28 16:58:35 dillon Exp $
35 */
36
37#ifndef _SYS_UIO_H_
38#define _SYS_UIO_H_
39
40/*
41 * XXX
42 * iov_base should be a void *.
43 */
44struct iovec {
45 char *iov_base; /* Base address. */
46 size_t iov_len; /* Length. */
47};
48
49enum uio_rw { UIO_READ, UIO_WRITE };
50
51/* Segment flag values. */
52enum uio_seg {
53 UIO_USERSPACE, /* from user data space */
54 UIO_SYSSPACE, /* from system space */
55 UIO_USERISPACE, /* from user I space */
56 UIO_NOCOPY /* don't copy, already in object */
57};
58
59#ifdef _KERNEL
60
61struct uio {
62 struct iovec *uio_iov;
63 int uio_iovcnt;
64 off_t uio_offset;
65 int uio_resid;
66 enum uio_seg uio_segflg;
67 enum uio_rw uio_rw;
68 struct proc *uio_procp;
69};
70
71/*
72 * Limits
73 */
74#define UIO_MAXIOV 1024 /* max 1K of iov's */
75#define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
76
77struct vm_object;
78
79void uio_yield __P((void));
80int uiomove __P((caddr_t, int, struct uio *));
81int uiomoveco __P((caddr_t, int, struct uio *, struct vm_object *));
82int uioread __P((int, struct uio *, struct vm_object *, int *));
83
84#else /* !_KERNEL */
85
86#include <sys/cdefs.h>
87
88__BEGIN_DECLS
89ssize_t readv __P((int, const struct iovec *, int));
90ssize_t writev __P((int, const struct iovec *, int));
91__END_DECLS
92
93#endif /* _KERNEL */
94
95#endif /* !_SYS_UIO_H_ */