[asio-users] Possible bug on Windows?

[Mark Jones]

Hi,

What I am seeing is present in both 1.44 and 1.49.

If I try to open a port on Windows 7 this way:

_socket.reset( new udp::socket( *_ioService, udp::endpoint( udp::v4(), _portToTry ) ) );

and succeed and then try again with the same port number in a completely different class instance, it will fail. This is correct and expected behavior.

However, if I instead try the following in a completely difference class instance with the same port number after a successful port opening as shown above:

_socket.reset( new udp::socket( *_ioService, udp::endpoint( udp::endpoint().address().from_string( _localIPAddress ), _portToTry ) ) );

it will succeed on Windows (and break the first listening socket), but it will not succeed and will not break the first listening socket on Mac OS X. I believe the behavior on Mac OS X is correct and the behavior on Windows 7 is likely not.

Is this a known bug on Windows?

So in other words, the following works correctly:

Class instance 1:

m_socket.reset( new udp::socket( *_ioService, udp::endpoint( udp::v4(), 49152) ) ); // success

Class instance 2:

m_socket.reset( new udp::socket( *_ioService, udp::endpoint( udp::v4(), 49152) ) ); // fail

And the following works in a way that I believe is incorrect on Windows:

Class instance 1:

m_socket.reset( new udp::socket( *_ioService, udp::endpoint( udp::v4(), 49152) ) ); // success

Class instance 2:

_socket.reset( new udp::socket( *_ioService, udp::endpoint( udp::endpoint().address().from_string( _localIPAddress ), 49152) ) ); // success and now Class instance 1 is no longer receiving packets

Whereas, on Mac OS X the following would be the case and I believe this is what should happen on all operating systems:

Class instance 1:

m_socket.reset( new udp::socket( *_ioService, udp::endpoint( udp::v4(), 49152) ) ); // success

Class instance 2:

_socket.reset( new udp::socket( *_ioService, udp::endpoint( udp::endpoint().address().from_string( _localIPAddress ), 49152) ) ); // failure

Thanks,
Mark

Mark Jones
Senior Software Engineer
Mobile Sensor and Network Data Acquisition
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MathWorks
3 Apple Hill Drive
Natick, MA 01760 USA
www.mathworks.com<http://www.mathworks.com/>
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