uv_accept should take optional sockaddr

[tjfontaine]

we should be able to fill out the peer information by default when accepting a socket, and avoid where possible the extra syscall

[saghul]

For Windows we'll need to use GetAcceptExSockaddrs after AcceptEx, apparently. http://msdn.microsoft.com/en-us/library/windows/desktop/ms738516%28v=vs.85%29.aspx

[indutny]

There are subtle problems with this, though it is still feasible. In fact, we are accepting new sockets ahead of time on unixes (in both IPC pipes and TCP server), and uv_accept() is technically are pop() equivalent on internal list of incoming sockets. On a bright side, only one socket is queued for TCP server, but even in case of that we'll need to allocate space for sockaddr_storage in order to be able to fetch with accept() syscall.

[saghul]

Sure, we'll need to look into that. IIRC Windows does a similar trick. I just had a quick look and I was curious about how this would work on Windows, so I left a note :-)