The send() call sends data on an already-connected socket.

The select() call can be used prior to issuing the send() call to determine when it is possible to send more data.

Stream sockets act like streams of information with no boundaries separating data. For example, if an application is required to send 1000 bytes, each call to this function can send 1 byte, or 10 bytes, or the entire 1000 bytes. Therefore, applications using stream sockets should place this call in a loop, calling this function until all data has been sent.