Compile the following XDR description of the procedures:

        program TIME_PROG {
            version TIME_VERS {
                long BIN_TIME(void) = 1;   /* Procedure number 1 */
                string STR_TIME(long) = 2; /* Procedure number 2 */
            } = 1;                         /* Version number 1   */
        } = 0x31234567;                    /* Program number 0x31234567 */
          

Use rpcgen to generate the stub files, sample files and Makefile:

rpcgen -a -C time.xdr          

Add to the sample files the code to implement the application:

To the server file:

        long * bin_time_1_svc(void *argp, struct svc_req *rqstp)
        {
                static long  result;

               
                result= time((time_t *) 0);
               

                return (&result);
        }

        char ** str_time_1_svc(long *argp, struct svc_req *rqstp)
        {
                static char * result;
                
               
                static tstr[128];
                long t, hour, min, sec;

                t= *argp;
                sec= t % 60;   t /= 60;
                min= t % 60;   t /= 60;
                hour= t % 24;
                sprintf(tstr, "hora %u:%u:%u", hour, min, sec);
                result= tstr;
               

                return (&result);
        }      

To the client file:

        void time_prog_1(char *host)
        {
            ...
            result_1 = bin_date_1((void *)&bin_date_1_arg, clnt);
            if (result_1 == (long *) NULL) 
                clnt_perror(clnt, "call failed");
            result_2 = str_date_1((long *) result_1, clnt);
            if (result_2 == (char **) NULL)
                clnt_perror(clnt, "call failed");

                           printf("Time: %u %s\n", *result_1, *result_2);

                       }
         ... 

Compile and run the application:

make makefile.time 

Make a clear description of the way this program works.

What are the advantages and disadvantages of using RPCs over sockets?

Rewrite the calculator program you wrote for the last laboratory assignment substituting the datagrams sockets for RPCs.