debian man page for socket_connect6

socket_connect6(3)					     Library Functions Manual						socket_connect6(3)

NAME
       socket_connect6 - attempt to make a TCP connection

SYNTAX
       #include <socket.h>

       int socket_connect6(int s, const char ip[16],
			   uint16 port,uint32 scope_id);

DESCRIPTION
       socket_connect6 attempts to make a connection from TCP socket s to TCP port port on IP address ip.

       The  meaning  of scope_id is dependent on the implementation and IPv6 IP.  On link-local IPv6 addresses it specifies the outgoing interface
       index.  The name (e.g. "eth0") for a given interface index can be queried with getifname.  scope_id should normally be set to 0.

       socket_connect6 may return

       o      0, to indicate that the connection succeeded (and succeeded immediately, if the socket is non-blocking)

       o      -1, setting errno to error_inprogress or error_wouldblock, to indicate that the socket is non-blocking

       o      -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_connect6 without calling socket_bind6.  This has the effect as first calling socket_bind6 with IP address :: and port
       0.

EXAMPLE
	 #include <socket.h>

	 int s;
	 char ip[16];
	 uint16 p;

	 s = socket_tcp6();
	 socket_bind6(s,ip,p);
	 socket_connect6(s,ip,p,0);

SEE ALSO
       socket_connect4(3), socket_getifname(3)

																socket_connect6(3)