a buffer to read data into (which should be at least @size bytes long).
whether to do blocking or non-blocking I/O
a %GCancellable or %NULL
Number of bytes read, or 0 if the connection was closed by the peer, or -1 on error
GException on failure.
2.26
This behaves exactly the same as g_socket_receive(), except that the choice of blocking or non-blocking behavior is determined by the @blocking argument rather than by @socket's properties.