tests/test-nonblocking-pipe.h

   1 /* Test for nonblocking read and write.
   2
   3    Copyright (C) 2011-2018 Free Software Foundation, Inc.
   4
   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.
   9
  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.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  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:
  20
  21      Platform                        PIPE_DATA_BLOCK_SIZE
  22
  23      Linux                           >= 63489
  24      Linux/SPARC                     >= 126977
  25      Linux/IA-64, Linux/MIPS         >= 253953
  26      Linux/PPC64                     >= 1048576
  27      FreeBSD, OpenBSD, Mac OS X      >= 65537
  28      AIX                             >= 32769
  29      HP-UX                           >= 8193
  30      IRIX                            >= 10241
  31      OSF/1                           >= 262145
  32      Solaris <= 7                    >= 10241
  33      Solaris >= 8                    >= 20481
  34      z/OS                            >= 131073
  35      Cygwin                          >= 65537
  36      native Windows                  >= 4097 (depends on the _pipe argument)
  37  */
  38 #if defined __MVS__ || defined __osf__ || (defined __linux__ && (defined __ia64__ || defined __mips__))
  39 # define PIPE_DATA_BLOCK_SIZE 270000
  40 #elif defined __linux__ && defined __sparc__
  41 # define PIPE_DATA_BLOCK_SIZE 140000
  42 #elif defined __linux__ && defined __powerpc__
  43 # define PIPE_DATA_BLOCK_SIZE 1100000
  44 #else
  45 # define PIPE_DATA_BLOCK_SIZE 70000
  46 #endif