FreeBSD/Linux Kernel Cross Reference
sys/sys/uio.h
1 /* $NetBSD: uio.h,v 1.31 2003/09/13 16:59:29 erh Exp $ */
2
3 /*
4 * Copyright (c) 1982, 1986, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)uio.h 8.5 (Berkeley) 2/22/94
32 */
33
34 #ifndef _SYS_UIO_H_
35 #define _SYS_UIO_H_
36
37 #ifdef _KERNEL
38 #ifndef __UIO_EXPOSE
39 #define __UIO_EXPOSE
40 #endif
41 #endif
42
43 #include <machine/ansi.h>
44 #include <sys/featuretest.h>
45
46 #ifdef _BSD_SIZE_T_
47 typedef _BSD_SIZE_T_ size_t;
48 #undef _BSD_SIZE_T_
49 #endif
50
51 #ifdef _BSD_SSIZE_T_
52 typedef _BSD_SSIZE_T_ ssize_t;
53 #undef _BSD_SSIZE_T_
54 #endif
55
56 struct iovec {
57 void *iov_base; /* Base address. */
58 size_t iov_len; /* Length. */
59 };
60
61 #if defined(_NETBSD_SOURCE)
62 #include <sys/ansi.h>
63
64 #ifndef off_t
65 typedef __off_t off_t; /* file offset */
66 #define off_t __off_t
67 #endif
68
69 enum uio_rw { UIO_READ, UIO_WRITE };
70
71 /* Segment flag values. */
72 enum uio_seg {
73 UIO_USERSPACE, /* from user data space */
74 UIO_SYSSPACE /* from system space */
75 };
76
77 #ifdef __UIO_EXPOSE
78
79 struct uio {
80 struct iovec *uio_iov; /* pointer to array of iovecs */
81 int uio_iovcnt; /* number of iovecs in array */
82 off_t uio_offset; /* offset into file this uio corresponds to */
83 size_t uio_resid; /* residual i/o count */
84 enum uio_seg uio_segflg; /* see above */
85 enum uio_rw uio_rw; /* see above */
86 struct proc *uio_procp;/* process if UIO_USERSPACE */
87 };
88
89 #endif /* __UIO_EXPOSE */
90
91 /*
92 * Limits
93 */
94 /* Deprecated: use IOV_MAX from <limits.h> instead. */
95 #define UIO_MAXIOV 1024 /* max 1K of iov's */
96 #endif /* _NETBSD_SOURCE */
97
98 #ifdef _KERNEL
99 #include <sys/mallocvar.h>
100
101 MALLOC_DECLARE(M_IOV);
102
103 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
104 #endif
105
106 #ifndef _KERNEL
107 #include <sys/cdefs.h>
108
109 __BEGIN_DECLS
110 #if defined(_NETBSD_SOURCE)
111 ssize_t preadv __P((int, const struct iovec *, int, off_t));
112 ssize_t pwritev __P((int, const struct iovec *, int, off_t));
113 #endif /* _NETBSD_SOURCE */
114 ssize_t readv __P((int, const struct iovec *, int));
115 ssize_t writev __P((int, const struct iovec *, int));
116 __END_DECLS
117 #else
118 int ureadc __P((int, struct uio *));
119 #endif /* !_KERNEL */
120
121 #endif /* !_SYS_UIO_H_ */
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