On Windows 0MQ sockets handles are inherited by child processes

On Windows 0MQ sockets created by an application are inherited by child processes that then keep them open.

If the application dies for some reason it cannot be restarted since the ports result as already bound.

On Linux this behaviour is prevented using O_CLOEXEC flag on the socket handle.

The way to do it in Windows would be to use the SetHandleInformation (http://msdn.microsoft.com/en-us/library/windows/desktop/ms724935(v=vs.85).aspx) on the sockets handles,

SetHandleInformation(socketHandle, HANDLE_FLAG_INHERIT, 0);

I hope this will be considered something to be fixed in the libzmq for Windows platforms.

Thanks for your support.

See pull request: https://github.com/zeromq/zeromq2-x/pull/51