Socket Inheritance on Windows with TcpListener

[samin-cf]

Hi all,

With the current implementation of mio's TcpListener, the socket is inherited by any child processes. The std library's TcpListener uses WSASocketW which does not have this issue due to the explicit WSA_FLAG_NO_HANDLE_INHERIT.

Would it be feasible to use WsaSocketW in mio?

[Thomasdezeeuw]

According to https://learn.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsasocketw#requirements the supported versions are Windows 8.1/Vista and Windows Server 2003, neither of which we support any more, so on that front we're good. I think we're ok to use WsaSocketW. Are you willing to send a pr @samin-cf?