Editing Berkeley sockets (section)

===connect===
''connect()'' establishes a direct communication link to a specific remote host identified by its address via a socket, identified by its file descriptor.

When using a [[Connection-oriented communication|connection-oriented]] protocol, this establishes a connection. Certain types of protocols are connectionless, most notably the [[User Datagram Protocol]]. When used with connectionless protocols, ''connect'' defines the remote address for sending and receiving data, allowing the use of functions such as ''send'' and ''recv''. In these cases, the connect function prevents reception of datagrams from other sources.

''connect()'' returns an integer representing the error code: ''0'' represents success, while ''–1'' represents an error. Historically, in BSD-derived systems, the state of a socket descriptor is undefined if the call to ''connect'' fails (as it is specified in the Single Unix Specification), thus, portable applications should close the socket descriptor immediately and obtain a new descriptor with socket(), in the case the call to connect() fails.{{sfn|Stevens|Rago|2013|p=607}}