#include	"unpxti.h"intmain(int argc, char **argv){	int		tfd;	if (argc != 3)		err_quit("usage: test01 <hostname/IPaddress> <service/port#>");	tfd = Tcp_connect(argv[1], argv[2]);	t_snd(tfd, "", 1, T_EXPEDITED);	exit(0);}