1 /* Copyright (C) 1991,1992,1996-1999,2003,2009,2012
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 #include <sys/types.h>
29 /* This file defines `struct iovec'. */
33 /* Read data from file descriptor FD, and put the result in the
34 buffers described by IOVEC, which is a vector of COUNT 'struct iovec's.
35 The buffers are filled in the order specified.
36 Operates just like 'read' (see <unistd.h>) except that data are
37 put in IOVEC instead of a contiguous buffer.
39 This function is a cancellation point and therefore not marked with
41 extern ssize_t readv (int __fd, const struct iovec *__iovec, int __count)
44 /* Write data pointed by the buffers described by IOVEC, which
45 is a vector of COUNT 'struct iovec's, to file descriptor FD.
46 The data is written in the order specified.
47 Operates just like 'write' (see <unistd.h>) except that the data
48 are taken from IOVEC instead of a contiguous buffer.
50 This function is a cancellation point and therefore not marked with
52 extern ssize_t writev (int __fd, const struct iovec *__iovec, int __count)
57 # ifndef __USE_FILE_OFFSET64
58 /* Read data from file descriptor FD at the given position OFFSET
59 without change the file pointer, and put the result in the buffers
60 described by IOVEC, which is a vector of COUNT 'struct iovec's.
61 The buffers are filled in the order specified. Operates just like
62 'pread' (see <unistd.h>) except that data are put in IOVEC instead
63 of a contiguous buffer.
65 This function is a cancellation point and therefore not marked with
67 extern ssize_t preadv (int __fd, const struct iovec *__iovec, int __count,
68 __off_t __offset) __wur;
70 /* Write data pointed by the buffers described by IOVEC, which is a
71 vector of COUNT 'struct iovec's, to file descriptor FD at the given
72 position OFFSET without change the file pointer. The data is
73 written in the order specified. Operates just like 'pwrite' (see
74 <unistd.h>) except that the data are taken from IOVEC instead of a
77 This function is a cancellation point and therefore not marked with
79 extern ssize_t pwritev (int __fd, const struct iovec *__iovec, int __count,
80 __off_t __offset) __wur;
83 extern ssize_t __REDIRECT (preadv, (int __fd, const struct iovec *__iovec,
84 int __count, __off64_t __offset),
86 extern ssize_t __REDIRECT (pwritev, (int __fd, const struct iovec *__iovec,
87 int __count, __off64_t __offset),
90 # define preadv preadv64
91 # define pwritev pwritev64
95 # ifdef __USE_LARGEFILE64
96 /* Read data from file descriptor FD at the given position OFFSET
97 without change the file pointer, and put the result in the buffers
98 described by IOVEC, which is a vector of COUNT 'struct iovec's.
99 The buffers are filled in the order specified. Operates just like
100 'pread' (see <unistd.h>) except that data are put in IOVEC instead
101 of a contiguous buffer.
103 This function is a cancellation point and therefore not marked with
105 extern ssize_t preadv64 (int __fd, const struct iovec *__iovec, int __count,
106 __off64_t __offset) __wur;
108 /* Write data pointed by the buffers described by IOVEC, which is a
109 vector of COUNT 'struct iovec's, to file descriptor FD at the given
110 position OFFSET without change the file pointer. The data is
111 written in the order specified. Operates just like 'pwrite' (see
112 <unistd.h>) except that the data are taken from IOVEC instead of a
115 This function is a cancellation point and therefore not marked with
117 extern ssize_t pwritev64 (int __fd, const struct iovec *__iovec, int __count,
118 __off64_t __offset) __wur;
124 #endif /* sys/uio.h */