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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)uio.h 8.5 (Berkeley) 2/22/94
30 * $FreeBSD: releng/6.1/sys/sys/uio.h 158179 2006-04-30 16:44:43Z cvs2svn $
31 */
32
33 #ifndef _SYS_UIO_H_
34 #define _SYS_UIO_H_
35
36 #include <sys/cdefs.h>
37 #include <sys/_types.h>
38 #include <sys/_iovec.h>
39
40 #ifndef _SSIZE_T_DECLARED
41 typedef __ssize_t ssize_t;
42 #define _SSIZE_T_DECLARED
43 #endif
44
45 #ifndef _OFF_T_DECLARED
46 typedef __off_t off_t;
47 #define _OFF_T_DECLARED
48 #endif
49
50 #if __BSD_VISIBLE
51 enum uio_rw { UIO_READ, UIO_WRITE };
52
53 /* Segment flag values. */
54 enum uio_seg {
55 UIO_USERSPACE, /* from user data space */
56 UIO_SYSSPACE, /* from system space */
57 UIO_NOCOPY /* don't copy, already in object */
58 };
59 #endif
60
61 #ifdef _KERNEL
62
63 struct uio {
64 struct iovec *uio_iov;
65 int uio_iovcnt;
66 off_t uio_offset;
67 int uio_resid;
68 enum uio_seg uio_segflg;
69 enum uio_rw uio_rw;
70 struct thread *uio_td;
71 };
72
73 /*
74 * Limits
75 *
76 * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
77 * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>. If
78 * we ever make this tunable (probably pointless), then IOV_MAX should be
79 * removed from <sys/syslimits.h> and applications would be expected to use
80 * sysconf(3) to find out the correct value, or else assume the worst
81 * (_XOPEN_IOV_MAX). Perhaps UIO_MAXIOV should be simply defined as
82 * IOV_MAX.
83 */
84 #define UIO_MAXIOV 1024 /* max 1K of iov's */
85
86 struct vm_object;
87 struct vm_page;
88
89 struct uio *cloneuio(struct uio *uiop);
90 int copyinfrom(const void * __restrict src, void * __restrict dst,
91 size_t len, int seg);
92 int copyiniov(struct iovec *iovp, u_int iovcnt, struct iovec **iov,
93 int error);
94 int copyinstrfrom(const void * __restrict src, void * __restrict dst,
95 size_t len, size_t * __restrict copied, int seg);
96 int copyinuio(struct iovec *iovp, u_int iovcnt, struct uio **uiop);
97 void uio_yield(void);
98 int uiomove(void *cp, int n, struct uio *uio);
99 int uiomove_frombuf(void *buf, int buflen, struct uio *uio);
100 int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, int n,
101 struct uio *uio);
102 int uiomoveco(void *cp, int n, struct uio *uio, int disposable);
103
104 #else /* !_KERNEL */
105
106 __BEGIN_DECLS
107 ssize_t readv(int, const struct iovec *, int);
108 ssize_t writev(int, const struct iovec *, int);
109 ssize_t preadv(int, const struct iovec *, int, off_t);
110 ssize_t pwritev(int, const struct iovec *, int, off_t);
111 __END_DECLS
112
113 #endif /* _KERNEL */
114
115 #endif /* !_SYS_UIO_H_ */
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