STIOC_SET_ACTIVE_PARTITION

This IOCTL allows the user to specify the partition on which to run subsequent tape operations. The data structure that is used for this IOCTL is

struct set_active_partition {
	unchar partition_number;
	unsigned long long logical_block_id;
	char reserved[32];
};

• partition_number is the number of the requested active partition.
• logical_block_id is the requested block position within the new active partition.

An example of the STIOC_SET_ACTIVE_PARTITION IOCTL is

int stioc_set_partition()
{
	int rc = 0;
	struct set_active_partition set;
	char* input = NULL;

	input = malloc(DEF_BUF_SIZE / 16);
	if(!input) {
		rc = ENOMEM;
		goto EXIT_LABEL;
	} /* if */
	memset(input, '\0', DEF_BUF_SIZE / 16);

	memset(&set, '\0', sizeof(struct set_active_partition));
 	while(input[0] < '0' || input[0] > '9') {
 		printf("Select partition (< 0 to cancel): ");
 		fgets(input, DEF_BUF_SIZE / 16, stdin);

  		if(input[0] == '-' && atoi(&input[1]) > 0) {
 			rc = 0;
 			goto EXIT_LABEL;
 		} /* if */

  		if(atoi(input) > MAX_PARTITIONS) {
 			printf("Please select number &lt; %d\n", MAX_PARTITIONS);
 			input[0] = '\0';
 		} /* if */
 	}  /* while */
 	set.partition_number = atoi(input);

  	printf("Issuing IOCTL...\n");
 	rc = ioctl(fd, STIOC_SET_ACTIVE_PARTITION, &set);
  	if(rc) {
 		printf("Set partition failed: %d\n", rc);
 		goto EXIT_LABEL;
 	} /* if */

  EXIT_LABEL:

  	if(input) free(input);
 	return rc;
 } /* stioc_set_partition() */