Network.Socket.recv throws IOException on reading 0 bytes

[tibbe]

My man pages has the following to say about the return value of recv:

These calls return the number of bytes received, or -1 if an error occurred.

For TCP sockets, the return value 0 means the peer has closed its half side of the connection.

This means that it's absolutely fine to read 0 bytes when using e.g. UDP socket.

However, the Network.Socket.recv function always throws an exception upon reading 0 bytes regardless of the protocol family.

[tibbe]

Moved to  http://trac.haskell.org/network/ticket/7