The send() call may be used only when the socket is in a connected state (so that the intended recipient is known). The only difference between send() and write(2) is the presence of flags. With a zero flags argument, send() is equivalent to write(2).

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man send (2): The system calls send(), sendto(), and sendmsg() are used to transmit a message to another socket. The send() call may be used only when the socket is in a connected state (so that the intended recipient is known).

If no messages space is available at the socket to hold the message to be transmitted, then send() normally blocks, unless the socket has been placed in non-blocking I/O mode. The select (2) system call may be used to determine when it is possible to send more data.

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Attempts TCP Fast Open (RFC7413) and sends data in the SYN like a combination of connect(2) and write(2), by performing an implicit connect(2) operation. It blocks until the data is buffered and the handshake has completed.