connectudp.c

comer s TCPIP-vol3源代码...当然是经典咯

/* connectUDP.c - connectUDP */

int	connectsock(const char *host, const char *service,
		const char *transport);

/*------------------------------------------------------------------------
 * connectUDP - connect to a specified UDP service on a specified host
 *------------------------------------------------------------------------
 */
int
connectUDP(const char *host, const char *service )
/*
 * Arguments:
 *      host    - name of host to which connection is desired
 *      service - service associated with the desired port
 */
{
	return connectsock(host, service, "udp");
}