Disable background bitmap writes. They appear to cause at least two race
[dragonfly.git] / sys / sys / uio.h
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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 $
25e80b06 35 * $DragonFly: src/sys/sys/uio.h,v 1.5 2003/10/02 19:21:06 drhodus Exp $
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36 */
37
38#ifndef _SYS_UIO_H_
39#define _SYS_UIO_H_
40
41/*
42 * XXX
43 * iov_base should be a void *.
44 */
45struct iovec {
46 char *iov_base; /* Base address. */
47 size_t iov_len; /* Length. */
48};
49
50enum uio_rw { UIO_READ, UIO_WRITE };
51
52/* Segment flag values. */
53enum uio_seg {
54 UIO_USERSPACE, /* from user data space */
55 UIO_SYSSPACE, /* from system space */
56 UIO_USERISPACE, /* from user I space */
57 UIO_NOCOPY /* don't copy, already in object */
58};
59
60#ifdef _KERNEL
61
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62/*
63 * uio_td is primarily used for USERSPACE transfers, but some devices
64 * like ttys may also use it to get at the process.
65 */
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66struct uio {
67 struct iovec *uio_iov;
68 int uio_iovcnt;
69 off_t uio_offset;
70 int uio_resid;
71 enum uio_seg uio_segflg;
72 enum uio_rw uio_rw;
dadab5e9 73 struct thread *uio_td;
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74};
75
76/*
77 * Limits
78 */
79#define UIO_MAXIOV 1024 /* max 1K of iov's */
80#define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
81
82struct vm_object;
83
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84void uio_yield (void);
85int uiomove (caddr_t, int, struct uio *);
25e80b06 86int uiomove_frombuf (void *buf, int buflen, struct uio *uio);
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87int uiomoveco (caddr_t, int, struct uio *, struct vm_object *);
88int uioread (int, struct uio *, struct vm_object *, int *);
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89
90#else /* !_KERNEL */
91
92#include <sys/cdefs.h>
93
94__BEGIN_DECLS
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95ssize_t readv (int, const struct iovec *, int);
96ssize_t writev (int, const struct iovec *, int);
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97__END_DECLS
98
99#endif /* _KERNEL */
100
101#endif /* !_SYS_UIO_H_ */