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56 lines
2.4 KiB
C
56 lines
2.4 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 SOCKET_DATA_BLOCK_SIZE, depending on kernel:
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Platform SOCKET_DATA_BLOCK_SIZE
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Linux >= 7350000 (depends on circumstances)
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FreeBSD >= 107521
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OpenBSD >= 28673
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Mac OS X >= 680000 (depends on circumstances)
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AIX 5.1 >= 125713
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AIX 7.1 >= 200000 (depends on circumstances)
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HP-UX >= 114689
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IRIX >= 61089
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OSF/1 >= 122881
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Solaris 7 >= 63000 (depends on circumstances)
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Solaris 8 >= 49153
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Solaris 9 >= 73729
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Solaris 10 >= 98305
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Solaris 11 2010-11 >= 73729
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Cygwin 1.5.x >= 66294401 but then write() fails with ENOBUFS
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Cygwin 1.7.x >= 163838 (depends on circumstances)
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native Windows >= 66294401
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*/
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#if defined __OpenBSD__
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# define SOCKET_DATA_BLOCK_SIZE 100000
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#else
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# define SOCKET_DATA_BLOCK_SIZE 1000000
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#endif
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/* On Linux, Mac OS X, Cygwin 1.5.x, native Windows,
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sockets have very large buffers in the kernel, so that write() calls
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succeed before the reader has started reading, even if fd is blocking
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and the amount of data is larger than 1 MB. */
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#if defined __linux__ || (defined __APPLE__ && defined __MACH__) || (defined _WIN32 || defined __WIN32__) || defined __CYGWIN__
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# define SOCKET_HAS_LARGE_BUFFER 1
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#else
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# define SOCKET_HAS_LARGE_BUFFER 0
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#endif
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