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/5.0/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
43 #ifndef _SIZE_T_DECLARED
44 typedef __size_t size_t;
45 #define _SIZE_T_DECLARED
46 #endif
47
48 #ifndef _SSIZE_T_DECLARED
49 typedef __ssize_t ssize_t;
50 #define _SSIZE_T_DECLARED
51 #endif
52
53 #ifndef _STRUCT_IOVEC_DECLARED
54 #define _STRUCT_IOVEC_DECLARED
55 struct iovec {
56 void *iov_base; /* Base address. */
57 size_t iov_len; /* Length. */
58 };
59 #endif
60
61 #if __BSD_VISIBLE
62 enum uio_rw { UIO_READ, UIO_WRITE };
63
64 /* Segment flag values. */
65 enum uio_seg {
66 UIO_USERSPACE, /* from user data space */
67 UIO_SYSSPACE, /* from system space */
68 UIO_NOCOPY /* don't copy, already in object */
69 };
70 #endif
71
72 #ifdef _KERNEL
73
74 struct uio {
75 struct iovec *uio_iov;
76 int uio_iovcnt;
77 off_t uio_offset;
78 int uio_resid;
79 enum uio_seg uio_segflg;
80 enum uio_rw uio_rw;
81 struct thread *uio_td;
82 };
83
84 /*
85 * Limits
86 *
87 * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
88 * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>. If
89 * we ever make this tunable (probably pointless), then IOV_MAX should be
90 * removed from <sys/syslimits.h> and applications would be expected to use
91 * sysconf(3) to find out the correct value, or else assume the worst
92 * (_XOPEN_IOV_MAX). Perhaps UIO_MAXIOV should be simply defined as
93 * IOV_MAX.
94 */
95 #define UIO_MAXIOV 1024 /* max 1K of iov's */
96 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
97
98 struct vm_object;
99
100 void uio_yield(void);
101 int uiomove(caddr_t, int, struct uio *);
102 int uiomove_frombuf(void *buf, int buflen, struct uio *uio);
103 int uiomoveco(caddr_t, int, struct uio *, struct vm_object *, int);
104 int uioread(int, struct uio *, struct vm_object *, int *);
105 int copyinfrom(const void *src, void *dst, size_t len, int seg);
106 int copyinstrfrom(const void *src, void *dst, size_t len,
107 size_t *copied, int seg);
108
109 #else /* !_KERNEL */
110
111 __BEGIN_DECLS
112 ssize_t readv(int, const struct iovec *, int);
113 ssize_t writev(int, const struct iovec *, int);
114 __END_DECLS
115
116 #endif /* _KERNEL */
117
118 #endif /* !_SYS_UIO_H_ */
Cache object: 0a04096c0c3b8c89584ac27cdba3e851
|