1/* $OpenBSD: uio.h,v 1.20 2024/10/26 05:39:03 jsg Exp $ */
2/* $NetBSD: uio.h,v 1.12 1996/02/09 18:25:45 christos Exp $ */
3
4/*
5 * Copyright (c) 1982, 1986, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)uio.h 8.5 (Berkeley) 2/22/94
33 */
34
35#ifndef _SYS_UIO_H_
36#define _SYS_UIO_H_
37
38#include <sys/cdefs.h>
39#include <sys/_types.h>
40
41#ifndef _SIZE_T_DEFINED_
42#define _SIZE_T_DEFINED_
43typedef __size_t size_t;
44#endif
45
46#ifndef _SSIZE_T_DEFINED_
47#define _SSIZE_T_DEFINED_
48typedef __ssize_t ssize_t;
49#endif
50
51struct iovec {
52 void *iov_base; /* Base address. */
53 size_t iov_len; /* Length. */
54};
55
56#if __BSD_VISIBLE /* needed by kdump */
57enum uio_rw { UIO_READ, UIO_WRITE };
58
59/* Segment flag values. */
60enum uio_seg {
61 UIO_USERSPACE, /* from user data space */
62 UIO_SYSSPACE /* from system space */
63};
64#endif /* __BSD_VISIBLE */
65
66#ifdef _KERNEL
67struct uio {
68 struct iovec *uio_iov; /* pointer to array of iovecs */
69 int uio_iovcnt; /* number of iovecs in array */
70 off_t uio_offset; /* offset into file this uio corresponds to */
71 size_t uio_resid; /* residual i/o count */
72 enum uio_seg uio_segflg; /* see above */
73 enum uio_rw uio_rw; /* see above */
74 struct proc *uio_procp;/* associated thread or NULL */
75};
76
77/*
78 * Limits
79 */
80#define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
81#endif /* _KERNEL */
82
83#if __BSD_VISIBLE
84#define UIO_MAXIOV 1024 /* Deprecated, use IOV_MAX instead */
85#endif
86
87#ifndef _KERNEL
88__BEGIN_DECLS
89#if __BSD_VISIBLE
90ssize_t preadv(int, const struct iovec *, int, __off_t);
91ssize_t pwritev(int, const struct iovec *, int, __off_t);
92#endif /* __BSD_VISIBLE */
93ssize_t readv(int, const struct iovec *, int);
94ssize_t writev(int, const struct iovec *, int);
95__END_DECLS
96#else
97int ureadc(int c, struct uio *);
98
99int iovec_copyin(const struct iovec *, struct iovec **, struct iovec *,
100 unsigned int, size_t *);
101void iovec_free(struct iovec *, unsigned int );
102int dofilereadv(struct proc *, int, struct uio *, int, register_t *);
103int dofilewritev(struct proc *, int, struct uio *, int, register_t *);
104
105#endif /* !_KERNEL */
106
107#endif /* !_SYS_UIO_H_ */