SIOC_REQSENSE
This IOCTL command returns the device sense data. If the last command resulted in an input/output error (EIO), the sense data is returned for the error. Otherwise, a new sense command is issued to the device.
The data structure is
struct request_sense
{
uint valid:1, /* sense data is valid */
err_code:7; /* error code */
uchar segnum; /* segment number */
uint fm:1, /* filemark detected */
eom:1, /* end of medium */
ili:1, /* incorrect length indicator */
resvd1:1, /* reserved */
key:4; /* sense key */
signed int info; /* information bytes */
uchar addlen; /* additional sense length */
uint cmdinfo; /* command specific information */
uchar asc; /* additional sense code */
uchar ascq; /* additional sense code qualifier */
uchar fru; /* field replaceable unit code */
uint sksv:1, /* sense key specific valid */
cd:1, /* control/data */
resvd2:2, /* reserved */
bpv:1, /* bit pointer valid */
sim:3; /* system information message */
uchar field[2]; /* field pointer */
uchar vendor[109]; /* vendor specific (padded to 127) */
};An example of the SIOC_REQSENSE command is
#include <sys/Atape.h>
struct request_sense sense_data;
if (!ioctl (smcfd, SIOC_REQSENSE, &sense_data))
{
printf ("The SIOC_REQSENSE ioctl succeeded\n");
printf ("\nThe request sense data is:\n");
dump_bytes ((uchar *)&sense_data, sizeof (struct request_sense));
}
else
{
perror ("The SIOC_REQSENSE ioctl failed");
}