tests/test-nonblocking-socket.h

   1 /* Test for nonblocking read and write.
   2
   3    Copyright (C) 2011-2024 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 SOCKET_DATA_BLOCK_SIZE, depending on kernel:
  20
  21      Platform                        SOCKET_DATA_BLOCK_SIZE
  22
  23      Linux                           >= 7350000 (depends on circumstances)
  24      Linux/Android                   >= 1700000 (approx.)
  25      FreeBSD                         >= 107521
  26      OpenBSD                         >= 106430 (depends on circumstances)
  27      Mac OS X                        >= 680000 (depends on circumstances)
  28      AIX 5.1                         >= 125713
  29      AIX 7.1                         >= 200000 (depends on circumstances)
  30      HP-UX                           >= 114689
  31      IRIX                            >= 61089
  32      OSF/1                           >= 122881
  33      Solaris 7                       >= 63000 (depends on circumstances)
  34      Solaris 8                       >= 49153
  35      Solaris 9                       >= 73729
  36      Solaris 10                      >= 98305
  37      Solaris 11 2010-11              >= 73729
  38      Cygwin 1.5.x                    >= 66294401 but then write() fails with ENOBUFS
  39      Cygwin 1.7.x                    >= 163838 (depends on circumstances)
  40      native Windows                  >= 66294401
  41  */
  42 #define SOCKET_DATA_BLOCK_SIZE 1000000
  43
  44 /* On Linux, Mac OS X, Cygwin 1.5.x, native Windows,
  45    sockets have very large buffers in the kernel, so that write() calls
  46    succeed before the reader has started reading, even if fd is blocking
  47    and the amount of data is larger than 1 MB.  */
  48 #if defined __linux__ || defined __ANDROID__ || (defined __APPLE__ && defined __MACH__) || defined _WIN32 || defined __CYGWIN__
  49 # define SOCKET_HAS_LARGE_BUFFER 1
  50 #else
  51 # define SOCKET_HAS_LARGE_BUFFER 0
  52 #endif