uio.h revision 7620 
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 * $Id: uio.h,v 1.3 1994/09/15 20:24:28 bde 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
60struct uio {
61	struct	iovec *uio_iov;
62	int	uio_iovcnt;
63	off_t	uio_offset;
64	int	uio_resid;
65	enum	uio_seg uio_segflg;
66	enum	uio_rw uio_rw;
67	struct	proc *uio_procp;
68};
69
70/*
71 * Limits
72 */
73#define UIO_MAXIOV	1024		/* max 1K of iov's */
74#define UIO_SMALLIOV	8		/* 8 on stack, else malloc */
75#endif /* KERNEL */
76
77#ifdef KERNEL
78
79int	uiomove __P((caddr_t, int, struct uio *));
80
81#else /* !KERNEL */
82
83#include <sys/cdefs.h>
84
85__BEGIN_DECLS
86ssize_t	readv __P((int, const struct iovec *, int));
87ssize_t	writev __P((int, const struct iovec *, int));
88__END_DECLS
89
90#endif /* KERNEL */
91
92#endif /* !_SYS_UIO_H_ */
93