1 /* $OpenBSD: uio.h,v 1.13 2005/12/13 00:35:23 millert 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 struct iovec {
39 void *iov_base; /* Base address. */
40 size_t iov_len; /* Length. */
41 };
42
43 enum uio_rw { UIO_READ, UIO_WRITE };
44
45 /* Segment flag values. */
46 enum uio_seg {
47 UIO_USERSPACE, /* from user data space */
48 UIO_SYSSPACE /* from system space */
49 };
50
51 #ifdef _KERNEL
52 struct uio {
53 struct iovec *uio_iov; /* pointer to array of iovecs */
54 int uio_iovcnt; /* number of iovecs in array */
55 off_t uio_offset; /* offset into file this uio corresponds to */
56 size_t uio_resid; /* residual i/o count */
57 enum uio_seg uio_segflg; /* see above */
58 enum uio_rw uio_rw; /* see above */
59 struct proc *uio_procp;/* associated process or NULL */
60 };
61
62 /*
63 * Limits
64 */
65 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
66 #endif /* _KERNEL */
67
68 #define UIO_MAXIOV 1024 /* Deprecated, use IOV_MAX instead */
69
70 #ifndef _KERNEL
71 #include <sys/cdefs.h>
72
73 __BEGIN_DECLS
74 #if __BSD_VISIBLE
75 ssize_t preadv(int, const struct iovec *, int, off_t);
76 ssize_t pwritev(int, const struct iovec *, int, off_t);
77 #endif /* __BSD_VISIBLE */
78 ssize_t readv(int, const struct iovec *, int);
79 ssize_t writev(int, const struct iovec *, int);
80 __END_DECLS
81 #else
82 int ureadc(int c, struct uio *);
83
84 int dofilereadv(struct proc *, int, struct file *,
85 const struct iovec *, int, off_t *, register_t *);
86 int dofilewritev(struct proc *, int, struct file *,
87 const struct iovec *, int, off_t *, register_t *);
88
89 #endif /* !_KERNEL */
90
91 #endif /* !_SYS_UIO_H_ */