FreeBSD/Linux Kernel Cross Reference
sys/sys/uio.h
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: releng/5.1/sys/sys/uio.h 120688 2003-10-03 13:02:50Z nectar $
35 */
36
37 #ifndef _SYS_UIO_H_
38 #define _SYS_UIO_H_
39
40 #include <sys/cdefs.h>
41 #include <sys/_types.h>
42 #include <sys/_iovec.h>
43
44 #ifndef _SSIZE_T_DECLARED
45 typedef __ssize_t ssize_t;
46 #define _SSIZE_T_DECLARED
47 #endif
48
49 #if __BSD_VISIBLE
50 enum uio_rw { UIO_READ, UIO_WRITE };
51
52 /* Segment flag values. */
53 enum uio_seg {
54 UIO_USERSPACE, /* from user data space */
55 UIO_SYSSPACE, /* from system space */
56 UIO_NOCOPY /* don't copy, already in object */
57 };
58 #endif
59
60 #ifdef _KERNEL
61
62 struct uio {
63 struct iovec *uio_iov;
64 int uio_iovcnt;
65 off_t uio_offset;
66 int uio_resid;
67 enum uio_seg uio_segflg;
68 enum uio_rw uio_rw;
69 struct thread *uio_td;
70 };
71
72 /*
73 * Limits
74 *
75 * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
76 * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>. If
77 * we ever make this tunable (probably pointless), then IOV_MAX should be
78 * removed from <sys/syslimits.h> and applications would be expected to use
79 * sysconf(3) to find out the correct value, or else assume the worst
80 * (_XOPEN_IOV_MAX). Perhaps UIO_MAXIOV should be simply defined as
81 * IOV_MAX.
82 */
83 #define UIO_MAXIOV 1024 /* max 1K of iov's */
84 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
85
86 struct vm_object;
87
88 void uio_yield(void);
89 int uiomove(void *, int, struct uio *);
90 int uiomove_frombuf(void *buf, int buflen, struct uio *uio);
91 int uiomoveco(void *, int, struct uio *, struct vm_object *, int);
92 int copyinfrom(const void *src, void *dst, size_t len, int seg);
93 int copyinstrfrom(const void *src, void *dst, size_t len,
94 size_t *copied, int seg);
95
96 #else /* !_KERNEL */
97
98 __BEGIN_DECLS
99 ssize_t readv(int, const struct iovec *, int);
100 ssize_t writev(int, const struct iovec *, int);
101 __END_DECLS
102
103 #endif /* _KERNEL */
104
105 #endif /* !_SYS_UIO_H_ */
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