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Chapter 3 User Flash 55
if ((fd0 = open(devname0, O_RDWR)) < 0) {
fprintf(stderr, "couldn’t open device: %s\n", devname0);
exit(1);
}
/* set the default PROM */
prom_id = 0;
fd = fd0;
/* let them know about the help menu */
fprintf(stderr, "Enter <h> or <?> for help on commands\n");
while (1) {
fprintf(stderr, "[%d]command> ", prom_id);
switch(get_cmd()) {
case ’q’:
goto getout;
case ’h’:
case ’?’:
h = 0;
while (*help[h]){
fprintf(stderr, " %s\n", help[h]);
h++;
}
break;
case ’6’: /* erase flash PROM block */
fprintf(stderr,
"Enter PROM block number[0, 56]> ");
scanf ("%d", &uflash_if.blk_num);
fprintf(stderr,
"Enter number of block> ");
scanf ("%d", &uflash_if.num_of_blks);
if (ioctl(fd, UIOCEBLK, &uflash_if) == -1)
goto getout;
break;
case ’5’: /* clear all locks */
if (ioctl(fd, UIOCCLCK, &uflash_if) == -1)
goto getout;
break;
CODE EXAMPLE 3-6 Sample User Flash Application Program (Continued)