source: rtems/cpukit/libnetworking/sys/uio.h @ 6d06a63

4.104.114.84.95
Last change on this file since 6d06a63 was 6d06a63, checked in by Ralf Corsepius <ralf.corsepius@…>, on 07/06/05 at 09:56:42

Partial update from FreeBSD.

  • Property mode set to 100644
File size: 3.1 KB
Line 
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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *      @(#)uio.h       8.5 (Berkeley) 2/22/94
30 * $FreeBSD: src/sys/sys/uio.h,v 1.38 2005/01/07 02:29:24 imp Exp $
31 */
32
33/*
34 * $Id$
35 */
36
37#ifndef _SYS_UIO_H_
38#define _SYS_UIO_H_
39
40#include <sys/cdefs.h>
41
42/*
43 * XXX
44 * iov_base should be a void *.
45 */
46struct iovec {
47        char    *iov_base;      /* Base address. */
48        size_t   iov_len;       /* Length. */
49};
50
51#if __BSD_VISIBLE
52enum    uio_rw { UIO_READ, UIO_WRITE };
53
54/* Segment flag values. */
55enum uio_seg {
56        UIO_USERSPACE,          /* from user data space */
57        UIO_SYSSPACE,           /* from system space */
58        UIO_USERISPACE,         /* from user I space */
59        UIO_NOCOPY              /* don't copy, already in object */
60};
61#endif
62
63#ifdef _KERNEL
64
65struct uio {
66        struct  iovec *uio_iov;
67        int     uio_iovcnt;
68        off_t   uio_offset;
69        int     uio_resid;
70        enum    uio_seg uio_segflg;
71        enum    uio_rw uio_rw;
72        struct  proc *uio_procp;
73};
74
75/*
76 * Limits
77 *
78 * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
79 * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>.  If
80 * we ever make this tunable (probably pointless), then IOV_MAX should be
81 * removed from <sys/syslimits.h> and applications would be expected to use
82 * sysconf(3) to find out the correct value, or else assume the worst
83 * (_XOPEN_IOV_MAX).  Perhaps UIO_MAXIOV should be simply defined as
84 * IOV_MAX.
85 */
86#define UIO_MAXIOV      1024            /* max 1K of iov's */
87
88int     uiomove(void *cp, int n, struct uio *uio);
89
90#else /* !_KERNEL */
91
92__BEGIN_DECLS
93ssize_t readv(int, const struct iovec *, int);
94ssize_t writev(int, const struct iovec *, int);
95__END_DECLS
96
97#endif /* _KERNEL */
98
99#endif /* !_SYS_UIO_H_ */
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