What is the difference between "connected" and "unconnected" sockets?
Unix Socket FAQ for Network programming
(Continued from previous question...)
What is the difference between "connected" and "unconnected"
sockets?
If a UDP socket is unconnected, which is the normal state after a
bind() call, then send() or write() are not allowed, since no
destination address is available; only sendto() can be used to send
data.
Calling connect() on the socket simply records the specified address
and port number as being the desired communications partner. That
means that send() or write() are now allowed; they use the destination
address and port given on the connect call as the destination of the
packet.
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