NAME

     atm_client_null - example client ATM program  using  a  null
     AAL

EXAMPLE

     /*
      * Copyright (c) 1992 by Fore Systems, Inc.
      */

     #ifndef lint
     static char -atm-client-null-c-[] = "@(#)$Id: atm-client-null.c,v 1.3 1994/06/28 20:18:38 jshirron Exp $ FSI";
     #endif /* lint */

     #include <stdio.h>
     #include <sys/file.h>
     #include <sys/fcntl.h>
     #include <fore-atm/fore-atm-user.h>

     #define SERVER-SAP      4096
     #define HOST-CELL-SIZE  56      /* ATM Computer Interface cell size */

     main(argc, argv)                                             main
         int     argc;
         char    *argv[];
     {
         int fd, cells, max-cells, octets, qlen;
         Atm-info info;
         Atm-endpoint dst;
         Atm-qos qos;
         Atm-qos-sel qos-selected;
         Atm-sap ssap;
         Aal-type aal = aal-null; /* specify a null connection */
         Atm-dataflow dataflow = simplex;
         char *device-name;
         char *tbuf;
         extern char *malloc();

         if (argc < 3) {
             fprintf(stderr, "Usage: %s device server-hostname [server-sap]\n",
                          argv[0]);
             exit(1);
         }

         device-name = malloc(strlen("/dev/") + strlen(argv[1]) + 1);
         sprintf(device-name, "/dev/%s", argv[1]);

         if ((fd = atm-open(device-name, O-RDWR, &info)) < 0) {
             perror("atm-open");
             exit(1);
         }
         tbuf = malloc(info.mtu);

         max-cells = info.mtu / HOST-CELL-SIZE; /* Max number of cells */

         /*
          * Let ATM driver assign a source SAP by specifying
          * sap of zero. Set incoming connect request length to
          * zero since we're the client. Servers set queue length
          * to non zero.
          */
         ssap = 0;
         qlen = 0;
         if (atm-bind(fd, ssap, &ssap, qlen) < 0) {
             atm-error("atm-bind");
             exit(1);
         }
         printf("SAP assigned=%d\n", ssap);

         /*
          * Initialize the server's data link address.
          */
         if (atm-gethostbyname(argv[2], &dst.nsap) < 0) {
             fprintf(stderr, "atm-gethostbyname failed\n");
             exit(1);
         }
         dst.asap = (argc == 4) ? atoi(argv[3]) : SERVER-SAP;

         /*
          * Request some quality of service.
          */
         qos.peak-bandwidth.target = 256; /* kbit/sec */
         qos.peak-bandwidth.minimum = 128; /* kbit/sec */
         qos.mean-bandwidth.target = 128; /* kbit/sec */
         qos.mean-bandwidth.minimum = 64; /* kbit/sec */
         qos.mean-burst.target = 2;  /* 2 kbit packet length */
         qos.mean-burst.minimum = 1; /* 1 kbit packet length */

         if (atm-connect(fd, &dst, &qos, &qos-selected, aal, dataflow) < 0) {
             atm-error("atm-connect");
             exit(1);
         }
         printf("selected qos peak=%d, mean=%d, burst=%d\n",
             qos-selected.peak-bandwidth,
             qos-selected.mean-bandwidth,
             qos-selected.mean-burst);

         for (cells = 1; cells <= max-cells; cells++) {

             octets = cells * HOST-CELL-SIZE;

             /*
              * The format of cells in `tbuf' is defined in
              * the appropriate ATM Computer Interface User's
              * Manual. The 48 octet cell payload is defined
              * by the application.
              */

             if (atm-send(fd, tbuf, octets) < 0) {
                 atm-error("atm-send");
                 exit(1);
             }
         }
         return(0);
     }

SEE ALSO

     atm_intro(4N)