Edit: uio_lim.h
/* Implementation limits related to sys/uio.h - Linux version. Copyright (C) 2017-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _BITS_UIO_LIM_H #define _BITS_UIO_LIM_H 1 /* Maximum length of the 'struct iovec' array in a single call to readv or writev. This macro has different values in different kernel versions. The latest versions of the kernel use 1024 and this is good choice. Since the C library implementation of readv/writev is able to emulate the functionality even if the currently running kernel does not support this large value the readv/writev call will not fail because of this. */ #define __IOV_MAX 1024 #endif
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