glibc (2.38)
1 /* Implementation limits related to sys/uio.h - Linux version.
2 Copyright (C) 2017-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
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.
9
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.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #ifndef _BITS_UIO_LIM_H
20 #define _BITS_UIO_LIM_H 1
21
22 /* Maximum length of the 'struct iovec' array in a single call to
23 readv or writev.
24
25 This macro has different values in different kernel versions. The
26 latest versions of the kernel use 1024 and this is good choice. Since
27 the C library implementation of readv/writev is able to emulate the
28 functionality even if the currently running kernel does not support
29 this large value the readv/writev call will not fail because of this. */
30 #define __IOV_MAX 1024
31
32 #endif
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