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47 lines
1.9 KiB
C
47 lines
1.9 KiB
C
/* Test for nonblocking read and write.
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Copyright (C) 2011-2017 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* A data block ought to be larger than the size of the in-kernel buffer.
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Working values of PIPE_DATA_BLOCK_SIZE, depending on kernel:
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Platform PIPE_DATA_BLOCK_SIZE
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Linux >= 63489
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Linux/SPARC >= 126977
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Linux/IA-64, Linux/MIPS >= 253953
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Linux/PPC64 >= 1048576
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FreeBSD, OpenBSD, Mac OS X >= 65537
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AIX >= 32769
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HP-UX >= 8193
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IRIX >= 10241
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OSF/1 >= 262145
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Solaris <= 7 >= 10241
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Solaris >= 8 >= 20481
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z/OS >= 131073
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Cygwin >= 65537
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native Windows >= 4097 (depends on the _pipe argument)
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*/
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#if defined __MVS__ || defined __osf__ || (defined __linux__ && (defined __ia64__ || defined __mips__))
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# define PIPE_DATA_BLOCK_SIZE 270000
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#elif defined __linux__ && defined __sparc__
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# define PIPE_DATA_BLOCK_SIZE 140000
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#elif defined __linux__ && defined __powerpc__
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# define PIPE_DATA_BLOCK_SIZE 1100000
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#else
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# define PIPE_DATA_BLOCK_SIZE 70000
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#endif
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