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/5.4/sys/sys/uio.h 145335 2005-04-20 19:11:07Z 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 #if __BSD_VISIBLE
46 enum uio_rw { UIO_READ, UIO_WRITE };
47
48 /* Segment flag values. */
49 enum uio_seg {
50 UIO_USERSPACE, /* from user data space */
51 UIO_SYSSPACE, /* from system space */
52 UIO_NOCOPY /* don't copy, already in object */
53 };
54 #endif
55
56 #ifdef _KERNEL
57
58 struct uio {
59 struct iovec *uio_iov;
60 int uio_iovcnt;
61 off_t uio_offset;
62 int uio_resid;
63 enum uio_seg uio_segflg;
64 enum uio_rw uio_rw;
65 struct thread *uio_td;
66 };
67
68 /*
69 * Limits
70 *
71 * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
72 * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>. If
73 * we ever make this tunable (probably pointless), then IOV_MAX should be
74 * removed from <sys/syslimits.h> and applications would be expected to use
75 * sysconf(3) to find out the correct value, or else assume the worst
76 * (_XOPEN_IOV_MAX). Perhaps UIO_MAXIOV should be simply defined as
77 * IOV_MAX.
78 */
79 #define UIO_MAXIOV 1024 /* max 1K of iov's */
80
81 struct vm_object;
82 struct vm_page;
83
84 struct uio *cloneuio(struct uio *uiop);
85 int copyinfrom(const void * __restrict src, void * __restrict dst,
86 size_t len, int seg);
87 int copyiniov(struct iovec *iovp, u_int iovcnt, struct iovec **iov,
88 int error);
89 int copyinstrfrom(const void * __restrict src, void * __restrict dst,
90 size_t len, size_t * __restrict copied, int seg);
91 int copyinuio(struct iovec *iovp, u_int iovcnt, struct uio **uiop);
92 void uio_yield(void);
93 int uiomove(void *cp, int n, struct uio *uio);
94 int uiomove_frombuf(void *buf, int buflen, struct uio *uio);
95 int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, int n,
96 struct uio *uio);
97 int uiomoveco(void *cp, int n, struct uio *uio, struct vm_object *obj,
98 int disposable);
99
100 #else /* !_KERNEL */
101
102 __BEGIN_DECLS
103 ssize_t readv(int, const struct iovec *, int);
104 ssize_t writev(int, const struct iovec *, int);
105 __END_DECLS
106
107 #endif /* _KERNEL */
108
109 #endif /* !_SYS_UIO_H_ */
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