This predicate waits on a server socket for a connection request by a
client. On success, it creates a new socket for the client and binds the
identifier to Slave. Peer is bound to the
IP-address of the client or the atom af_unix if Socket
is an AF_UNIX socket (see
unix_domain_socket/1).
[det]tcp_accept(+Socket,
-Slave, -Peer)