1 /* Test for nonblocking read and write.
3 Copyright (C) 2011-2012 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program 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
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 /* A data block ought to be larger than the size of the in-kernel buffer.
19 Working values of PIPE_DATA_BLOCK_SIZE, depending on kernel:
21 Platform PIPE_DATA_BLOCK_SIZE
25 Linux/IA-64, Linux/MIPS >= 253953
26 Linux/PPC64 >= 1048576
27 FreeBSD, OpenBSD, MacOS X >= 65537
35 native Windows >= 4097 (depends on the _pipe argument)
37 #if defined __osf__ || (defined __linux__ && (defined __ia64__ || defined __mips__))
38 # define PIPE_DATA_BLOCK_SIZE 270000
39 #elif defined __linux__ && defined __sparc__
40 # define PIPE_DATA_BLOCK_SIZE 140000
41 #elif defined __linux__ && defined __powerpc__
42 # define PIPE_DATA_BLOCK_SIZE 1100000
44 # define PIPE_DATA_BLOCK_SIZE 70000