Daniel Stutzbach <[email protected]> added the comment:
On Windows, socket.dup is implemented using DuplicateHandle. The documentation
for DuplicateHandle reads:
You should not use DuplicateHandle to duplicate handles to the following
objects:
* I/O completion ports. No error is returned, but the duplicate handle
cannot be used.
* Sockets. No error is returned, but the duplicate handle may not be
recognized by Winsock at the target process. Also, using DuplicateHandle
interferes with internal reference counting on the underlying object. To
duplicate a socket handle, use the WSADuplicateSocket function.
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<http://bugs.python.org/issue9753>
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