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At lines 113 through 117, the select() function is called, with the first argument
set to zero if the program is compiled on the Win32 platform. Note that the
first argument is not used on the Win32 platform and is supported for cross-
platform-compatibility only.
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At line 120, the select() function is called with a non-zero valid for the first
argument if the program is compiled on a non-Win32 platform.The select()
function requires that the first argument is properly set when used on UNIX
platforms.
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At lines 124 through 129, error checking is performed using if-def pre-com-
piler directives.
send(), sendto()
The UNIX signature and required header files ...