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1 : /* Copyright (C) 1991-2018 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 : #include <sys/types.h>
23 : #include <bits/types/struct_iovec.h>
24 : #include <bits/uio_lim.h>
25 : #ifdef __IOV_MAX
26 : # define UIO_MAXIOV __IOV_MAX
27 : #else
28 : # undef UIO_MAXIOV
29 : #endif
30 :
31 : __BEGIN_DECLS
32 :
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.
38 :
39 : This function is a cancellation point and therefore not marked with
40 : __THROW. */
41 8231097 : extern ssize_t readv (int __fd, const struct iovec *__iovec, int __count)
42 : __wur;
43 :
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.
49 :
50 : This function is a cancellation point and therefore not marked with
51 : __THROW. */
52 6627875 : extern ssize_t writev (int __fd, const struct iovec *__iovec, int __count)
53 : __wur;
54 :
55 :
56 : #ifdef __USE_MISC
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.
64 :
65 : This function is a cancellation point and therefore not marked with
66 : __THROW. */
67 : extern ssize_t preadv (int __fd, const struct iovec *__iovec, int __count,
68 : __off_t __offset) __wur;
69 :
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
75 : contiguous buffer.
76 :
77 : This function is a cancellation point and therefore not marked with
78 : __THROW. */
79 : extern ssize_t pwritev (int __fd, const struct iovec *__iovec, int __count,
80 : __off_t __offset) __wur;
81 :
82 : # else
83 : # ifdef __REDIRECT
84 : extern ssize_t __REDIRECT (preadv, (int __fd, const struct iovec *__iovec,
85 : int __count, __off64_t __offset),
86 : preadv64) __wur;
87 : extern ssize_t __REDIRECT (pwritev, (int __fd, const struct iovec *__iovec,
88 : int __count, __off64_t __offset),
89 : pwritev64) __wur;
90 : # else
91 : # define preadv preadv64
92 : # define pwritev pwritev64
93 : # endif
94 : # endif
95 :
96 : # ifdef __USE_LARGEFILE64
97 : /* Read data from file descriptor FD at the given position OFFSET
98 : without change the file pointer, and put the result in the buffers
99 : described by IOVEC, which is a vector of COUNT 'struct iovec's.
100 : The buffers are filled in the order specified. Operates just like
101 : 'pread' (see <unistd.h>) except that data are put in IOVEC instead
102 : of a contiguous buffer.
103 :
104 : This function is a cancellation point and therefore not marked with
105 : __THROW. */
106 : extern ssize_t preadv64 (int __fd, const struct iovec *__iovec, int __count,
107 : __off64_t __offset) __wur;
108 :
109 : /* Write data pointed by the buffers described by IOVEC, which is a
110 : vector of COUNT 'struct iovec's, to file descriptor FD at the given
111 : position OFFSET without change the file pointer. The data is
112 : written in the order specified. Operates just like 'pwrite' (see
113 : <unistd.h>) except that the data are taken from IOVEC instead of a
114 : contiguous buffer.
115 :
116 : This function is a cancellation point and therefore not marked with
117 : __THROW. */
118 : extern ssize_t pwritev64 (int __fd, const struct iovec *__iovec, int __count,
119 : __off64_t __offset) __wur;
120 : # endif
121 : #endif /* Use misc. */
122 :
123 :
124 : #ifdef __USE_GNU
125 : # ifndef __USE_FILE_OFFSET64
126 : /* Same as preadv but with an additional flag argumenti defined at uio.h. */
127 : extern ssize_t preadv2 (int __fp, const struct iovec *__iovec, int __count,
128 : __off_t __offset, int ___flags) __wur;
129 :
130 : /* Same as preadv but with an additional flag argument defined at uio.h. */
131 : extern ssize_t pwritev2 (int __fd, const struct iovec *__iodev, int __count,
132 : __off_t __offset, int __flags) __wur;
133 :
134 : # else
135 : # ifdef __REDIRECT
136 : extern ssize_t __REDIRECT (pwritev2, (int __fd, const struct iovec *__iovec,
137 : int __count, __off64_t __offset,
138 : int __flags),
139 : pwritev64v2) __wur;
140 : extern ssize_t __REDIRECT (preadv2, (int __fd, const struct iovec *__iovec,
141 : int __count, __off64_t __offset,
142 : int __flags),
143 : preadv64v2) __wur;
144 : # else
145 : # define preadv2 preadv64v2
146 : # define pwritev2 pwritev64v2
147 : # endif
148 : # endif
149 :
150 : # ifdef __USE_LARGEFILE64
151 : /* Same as preadv but with an additional flag argumenti defined at uio.h. */
152 : extern ssize_t preadv64v2 (int __fp, const struct iovec *__iovec,
153 : int __count, __off64_t __offset,
154 : int ___flags) __wur;
155 :
156 : /* Same as preadv but with an additional flag argument defined at uio.h. */
157 : extern ssize_t pwritev64v2 (int __fd, const struct iovec *__iodev,
158 : int __count, __off64_t __offset,
159 : int __flags) __wur;
160 : # endif
161 : #endif /* Use GNU. */
162 :
163 : __END_DECLS
164 :
165 : /* Some operating systems provide system-specific extensions to this
166 : header. */
167 : #ifdef __USE_GNU
168 : # include <bits/uio-ext.h>
169 : #endif
170 :
171 : #endif /* sys/uio.h */
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