rdate.c

the source code from the book "UNIX Network Programming" by W. Richard Stevens. i hope it is useful

/*
 * rdate.c - client program for remote date service.
 */

#include	<stdio.h>
#include	<rpc/rpc.h>	/* standard RPC include file */
#include	"date.h"	/* this file is generated by rpcgen */

main(argc, argv)
int	argc;
char	*argv[];
{
	CLIENT		*cl;		/* RPC handle */
	char		*server;
	long		*lresult;	/* return value from bin_date_1() */
	char		**sresult;	/* return value from str_date_1() */

	if (argc != 2) {
		fprintf(stderr, "usage: %s hostname\n", argv[0]);
		exit(1);
	}
	server = argv[1];

	/*
	 * Create the client "handle."
	 */

	if ( (cl = clnt_create(server, DATE_PROG, DATE_VERS, "udp")) == NULL) {
		/*
		 * Couldn't establish connection with server.
		 */

		clnt_pcreateerror(server);
		exit(2);
	}

	/*
	 * First call the remote procedure "bin_date".
	 */

	if ( (lresult = bin_date_1(NULL, cl)) == NULL) {
		clnt_perror(cl, server);
		exit(3);
	}
	printf("time on host %s = %ld\n", server, *lresult);

	/*
	 * Now call the remote procedure "str_date".
	 */

	if ( (sresult = str_date_1(lresult, cl)) == NULL) {
		clnt_perror(cl, server);
		exit(4);
	}
	printf("time on host %s = %s", server, *sresult);

	clnt_destroy(cl);		/* done with the handle */
	exit(0);
}