STIOCQRYINQUIRY

The output data structure is

/* inquiry data info */
struct inq_data_s
   {
   BYTE b0;
   /* macros for accessing fields of byte 1 */
   #define PERIPHERAL_QUALIFIER(x)   ((x->b0 & 0xE0)>>5)
   #define PERIPHERAL_CONNECTED          0x00
   #define PERIPHERAL_NOT_CONNECTED      0x01
   #define LUN_NOT_SUPPORTED             0x03

   #define PERIPHERAL_DEVICE__TYPE(x) (x->b0 & 0x1F)
   #define DIRECT_ACCESS                 0x00
   #define SEQUENTIAL_DEVICE             0x01
   #define PRINTER_DEVICE                0x02
   #define PROCESSOR_DEVICE              0x03
   #define CD_ROM_DEVICE                 0x05
   #define OPTICAL_MEMORY_DEVICE         0x07
   #define MEDIUM_CHANGER_DEVICE         0x08
   #define UNKNOWN                       0x1F

    BYTE b1;
    /* macros for accessing fields of byte 2 */
    #define RMB(x) ((x->b1 & 0x80)>>7)        /* removable media bit */
    #define FIXED     0
    #define REMOVABLE 1
    #define device_type_qualifier(x) (x->b1 & 0x7F) /* vendor specific */

    BYTE b2;
    /* macros for accessing fields of byte 3 */
    #define ISO_Version(x)  ((x->b2 & 0xC0)>>6)
    #define ECMA_Version(x) ((x->b2 & 0x38)>>3)
    #define ANSI_Version(x) ((x->b2 & 0x07)
     #define NONSTANDARD     0
     #define SCSI1           1
     #define SCSI2           2

BYTE b3;
/* macros for accessing fields of byte 4 */
#define AENC(x)    ((x->b3 & 0x80)>>7)  /* asynchronous event notification */
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#define TrmIOP(x) ((x->b3 & 0x40)>>6) /* support terminate I/O process message? */
#define Response_Data_Format(x)  (x->b3 & 0x0F)
#define SCSI1INQ      0        /* SCSI-1 standard inquiry data format */
#define CCSINQ        1        /* CCS standard inquiry data format */
#define SCSI2INQ      2        /* SCSI-2 standard inquiry data format */

BYTE additional_length;        /* number of bytes following this field minus 4 */
BYTE res56[2];

BYTE b7;
/* macros for accessing fields of byte 7 */
#define RelAdr(x)  ((x->b7 & 0x80)>>7) /* the following fields are true or false */
#define WBus32(x)  ((x->b7 & 0x40)>>6)
#define WBus16(x)  ((x->b7 & 0x20)>>5)
#define Sync(x)    ((x->b7 & 0x10)>>4)
#define Linked(x)  ((x->b7 & 0x08)>>3)
#define CmdQue(x)  ((x->b7 & 0x02)>>1)
#define SftRe(x)   ((x->b7 & 0x01)


  char vendor_identification[8];
  char product_identification[16];
  char product_revision_level[4];
  };
struct st_inquiry
   {
   struct inq_data_s standard;
   BYTE vendor_specific[255-sizeof(struct inq_data_s)];
   };

An example of the STIOCQRYINQUIRY command is

struct st_inquiry inqd;
if (ioctl(tapefd,STIOCQRYINQUIRY,&inqd)<0)
    {
    printf("IOCTL failure. errno=%d",errno);
    exit(errno);
    }
if (ANSI_Version(((struct inq_data_s *)&(inqd.standard)))==SCSI2)
     printf("Hey! We have a SCSI-2 device\n");