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Mark Geisert 9e573ba50f Cygwin: Allow to set SO_PEERCRED zero (v2)
The existing code errors as EINVAL any attempt to set a value for
SO_PEERCRED via setsockopt() on an AF_UNIX/AF_LOCAL socket.  But to
enable the workaround set_no_getpeereid behavior for Python one has
to be able to set SO_PEERCRED to zero.  Ergo, this patch.  Python has
no way to specify a NULL pointer for 'optval'.

This v2 of patch allows the original working (i.e., allow NULL,0 for
optval,optlen to mean turn off SO_PEERCRED) in addition to the new
working described above.  The sense of the 'if' stmt is reversed for
readability.
2020-12-07 16:29:11 +01:00
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