int socket_connect4(int s,const char ip,uint16 port);
socket_connect4 attempts to make a connection from TCP socket s to TCP port port on IP address ip.
socket_connect4 may return
- 0, to indicate that the connection succeeded (and succeeded immediately, if the socket is non-blocking)
- -1, setting errno to error_inprogress or error_wouldblock, to indicate that the socket is non-blocking
- -1, setting errno to something else, to indicate that the connection failed (and failed immediately, if the socket is non-blocking).
When a background connection succeeds or fails, s becomes writable; you can use socket_connected to see whether the connection succeeded. If the connection failed, socket_connected returns 0, setting errno appropriately.
Once a TCP socket is connected, you can use the read and write system calls to transmit data.
You can call socket_connect4 without calling socket_bind4. This has the effect as first calling socket_bind4 with IP address 0.0.0.0 and port 0.
s = socket_tcp4();
socket_connect6(3), socket_fastopen_connect4(3), socket_listen(3).