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socket() Create network endpoint.
bind() Associate a network address with a previously created socket.
listen() Listen for and queue incoming connection requests.
accept() Accept a connection request fork servicing if one is available; otherwise, wait for one to become available and then accept.
connect() Initiate a connection to a remote socket (which must already exist and have an address bound to it).
shutdown() Terminate socket connection immediately.
send() Send UDP message through a given socket.
recv() Receive a UDP message from a given socket.
select Check a set of file descriptors to see if any can be read from or written to.
setsockopt() Change communication parameters on a socket.
sigaction() Change process behaviour to receipt of asynchronous signals.
close() Close one end of a socket connection.
setsid() Change process' session identifier
recvfrom() Receive message from a given UDP socket.
sendto() BSD: sendmsg() Send a message from a given UDP socket.