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/* Test for nonblocking read and write.
Copyright (C) 2011-2022 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* A data block ought to be larger than the size of the in-kernel buffer.
Working values of PIPE_DATA_BLOCK_SIZE, depending on kernel:
Platform PIPE_DATA_BLOCK_SIZE
Linux >= 63489
Linux/SPARC >= 126977
Linux/IA-64, Linux/MIPS >= 253953
Linux/PPC64 >= 1048576
FreeBSD, OpenBSD, Mac OS X >= 65537
AIX >= 32769
HP-UX >= 8193
IRIX >= 10241
OSF/1 >= 262145
Solaris <= 7 >= 10241
Solaris >= 8 >= 20481
z/OS >= 131073
Cygwin >= 65537
native Windows >= 4097 (depends on the _pipe argument)
*/
#if defined __MVS__ || defined __osf__ || (defined __linux__ && (defined __ia64__ || defined __mips__))
# define PIPE_DATA_BLOCK_SIZE 270000
#elif defined __linux__ && defined __sparc__
# define PIPE_DATA_BLOCK_SIZE 140000
#elif defined __linux__ && defined __powerpc__
# define PIPE_DATA_BLOCK_SIZE 1100000
#elif defined _WIN32 && !defined __CYGWIN__
# define PIPE_DATA_BLOCK_SIZE 10000
#else
# define PIPE_DATA_BLOCK_SIZE 70000
#endif
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