STIOC_CREATE_PARTITION

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This IOCTL creates partitions on tapes that support partitioning. The data structure that is used for this IOCTL is
#define IDP_PARTITION    (1)
#define SDP_PARTITION    (2)
#define FDP_PARTITION    (3)
struct tape_partition {
	unchar type;
	unchar number_of_partitions;
	unchar size_unit;
	ushort size[MAX_PARTITIONS];
	char reserved[32];
};
Type is the type of partition, whether IDP_PARTITION (initiator defined partition), SDP_PARTITION (select data partition), or FDP_PARTITION (fixed data partition). The behavior of these options is described in the SCSI reference for your tape drive.
  • number_of_partitions is the number of partitions the user wants to create.
  • size_unit is as defined in the STIOC_QUERY_PARTITION section.
  • size is an array of requested sizes, in size_units, one array element per partition.
An example of the STIOC_CREATE_PARTITION IOCTL is
int stioc_create_partition()
{
	int rc = 0, i = 0, char_cap = 0, short_cap = 0;
	struct tape_partition crt;
	char* input = NULL;

	char_cap = pow(2, sizeof(char) * BITS_PER_BYTE) - 1;
	short_cap = pow(2, sizeof(short) * BITS_PER_BYTE) - 1;

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

	memset(&crt, '\0', sizeof(struct tape_partition));

  	while(atoi(input) < IDP_PARTITION || atoi(input) > FDP_PARTITION + 1) {
 		printf("%d) IDP_PARTITION\n", IDP_PARTITION);
 		printf("%d) SDP_PARTITION\n", SDP_PARTITION);
 		printf("%d) FDP_PARTITION\n", FDP_PARTITION);
 		printf("%d) Cancel\n", FDP_PARTITION + 1);
 		printf("\nPlease select: ");

    fgets(input, DEF_BUF_SIZE / 16, stdin);
 		if(atoi(input) == FDP_PARTITION + 1) {
 			rc = 0;
 			goto EXIT_LABEL;
 		} /* if */
 	} /* while */

  	crt.type = atoi(input);

  	memset(input, '\0', DEF_BUF_SIZE / 16);
 	 while(input[0] < '1' || input[0] > '9') {
 		printf("Enter desired number of partitions (0 to cancel): ");
 		fgets(input, DEF_BUF_SIZE / 16, stdin);
 		if(input[0] == '0') {
 			rc = 0;
 			goto EXIT_LABEL;
 		} /* if */

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

  	crt.number_of_partitions = atoi(input);

  	if(crt.type == IDP_PARTITION && crt.number_of_partitions > 1) {
 		memset(input, '\0', DEF_BUF_SIZE / 16);
 		while(input[0] < '0' || input[0] > '9') {
 			printf("Enter size unit (0 to cancel): ");
 			fgets(input, DEF_BUF_SIZE / 16, stdin);
 			if(input[0] == '0') {
 				rc = 0;
 				goto EXIT_LABEL;
 			} /* if */
  			if(atoi(input) > char_cap) {
 				printf("Please select number <= %d\n", char_cap);
 				input[0] = '\0';
 			} /* if */
 		} /* while */
 		crt.size_unit = atoi(input);

  		for(i = 0; i < crt.number_of_partitions; i++) {
 			memset(input, '\0', DEF_BUF_SIZE / 16);
 			while(input[0] != '-' &&
 				(input[0] < '0' || input[0] > '9')) {
 				printf("Enter size[%d] (0 to cancel, < 0 for "\
 				"remaining space on cartridge): ", i);
 				fgets(input, DEF_BUF_SIZE / 16, stdin);
 				if(input[0] == '0') {
 					rc = 0;
 					goto EXIT_LABEL;
 				} /* if */

  				if(atoi(input) > short_cap) {
 					printf("Please select number <= %d\n",
 					short_cap);
 					input[0] = '\0';
 				} /* if */
 			} /* while */
 			if(input[0] == '-' && atoi(&input[1]) > 0)
 			crt.size[i] = 0xFFFF;
 			else crt.size[i] = atoi(input);
 		} /* for */
 	} /* if */

  	printf("Issuing IOCTL...\n");
 	rc = ioctl(fd, STIOC_CREATE_PARTITION, &crt);

  	if(rc) {
 		printf("Create partition failed: %d\n", rc);
 		goto EXIT_LABEL;
 	} /* if */

  EXIT_LABEL:

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