1/* Copyright (C) 1991-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#ifndef _SYS_UIO_H
19#define _SYS_UIO_H 1
20
21#include <features.h>
22
23#include <sys/types.h>
24
25__BEGIN_DECLS
26
27/* This file defines `struct iovec'. */
28#include <bits/uio.h>
29
30
31/* Read data from file descriptor FD, and put the result in the
32 buffers described by IOVEC, which is a vector of COUNT 'struct iovec's.
33 The buffers are filled in the order specified.
34 Operates just like 'read' (see <unistd.h>) except that data are
35 put in IOVEC instead of a contiguous buffer.
36
37 This function is a cancellation point and therefore not marked with
38 __THROW. */
39extern ssize_t readv (int __fd, const struct iovec *__iovec, int __count)
40 __wur;
41
42/* Write data pointed by the buffers described by IOVEC, which
43 is a vector of COUNT 'struct iovec's, to file descriptor FD.
44 The data is written in the order specified.
45 Operates just like 'write' (see <unistd.h>) except that the data
46 are taken from IOVEC instead of a contiguous buffer.
47
48 This function is a cancellation point and therefore not marked with
49 __THROW. */
50extern ssize_t writev (int __fd, const struct iovec *__iovec, int __count)
51 __wur;
52
53
54#ifdef __USE_MISC
55# ifndef __USE_FILE_OFFSET64
56/* Read data from file descriptor FD at the given position OFFSET
57 without change the file pointer, and put the result in the buffers
58 described by IOVEC, which is a vector of COUNT 'struct iovec's.
59 The buffers are filled in the order specified. Operates just like
60 'pread' (see <unistd.h>) except that data are put in IOVEC instead
61 of a contiguous buffer.
62
63 This function is a cancellation point and therefore not marked with
64 __THROW. */
65extern ssize_t preadv (int __fd, const struct iovec *__iovec, int __count,
66 __off_t __offset) __wur;
67
68/* Write data pointed by the buffers described by IOVEC, which is a
69 vector of COUNT 'struct iovec's, to file descriptor FD at the given
70 position OFFSET without change the file pointer. The data is
71 written in the order specified. Operates just like 'pwrite' (see
72 <unistd.h>) except that the data are taken from IOVEC instead of a
73 contiguous buffer.
74
75 This function is a cancellation point and therefore not marked with
76 __THROW. */
77extern ssize_t pwritev (int __fd, const struct iovec *__iovec, int __count,
78 __off_t __offset) __wur;
79# else
80# ifdef __REDIRECT
81extern ssize_t __REDIRECT (preadv, (int __fd, const struct iovec *__iovec,
82 int __count, __off64_t __offset),
83 preadv64) __wur;
84extern ssize_t __REDIRECT (pwritev, (int __fd, const struct iovec *__iovec,
85 int __count, __off64_t __offset),
86 pwritev64) __wur;
87# else
88# define preadv preadv64
89# define pwritev pwritev64
90# endif
91# endif
92
93# ifdef __USE_LARGEFILE64
94/* Read data from file descriptor FD at the given position OFFSET
95 without change the file pointer, and put the result in the buffers
96 described by IOVEC, which is a vector of COUNT 'struct iovec's.
97 The buffers are filled in the order specified. Operates just like
98 'pread' (see <unistd.h>) except that data are put in IOVEC instead
99 of a contiguous buffer.
100
101 This function is a cancellation point and therefore not marked with
102 __THROW. */
103extern ssize_t preadv64 (int __fd, const struct iovec *__iovec, int __count,
104 __off64_t __offset) __wur;
105
106/* Write data pointed by the buffers described by IOVEC, which is a
107 vector of COUNT 'struct iovec's, to file descriptor FD at the given
108 position OFFSET without change the file pointer. The data is
109 written in the order specified. Operates just like 'pwrite' (see
110 <unistd.h>) except that the data are taken from IOVEC instead of a
111 contiguous buffer.
112
113 This function is a cancellation point and therefore not marked with
114 __THROW. */
115extern ssize_t pwritev64 (int __fd, const struct iovec *__iovec, int __count,
116 __off64_t __offset) __wur;
117# endif
118#endif /* Use misc. */
119
120__END_DECLS
121
122#endif /* sys/uio.h */
123