'\" te
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.TH scsi_arq_status 9S "30 Sep 1996" "SunOS 5.11" "Data Structures for Drivers"
.SH NAME
scsi_arq_status \- SCSI auto request sense structure
.SH SYNOPSIS
.LP
.nf
#include <sys/scsi/scsi.h> 
.fi

.SH INTERFACE LEVEL
.sp
.LP
Solaris DDI specific (Solaris DDI)
.SH DESCRIPTION
.sp
.LP
When auto request sense has been enabled using  \fBscsi_ifsetcap\fR(9F) and the
"auto-rqsense" capability, the target driver must allocate a status area in the
\fBSCSI\fR packet structure for the auto request sense structure (see
\fBscsi_pkt\fR(9S)).  In the event of a \fBcheck\fR \fIcondition\fR, the
transport layer automatically executes a request sense command.  This check
ensures that the request sense information does not get lost. The auto request
sense structure supplies the \fBSCSI\fR status of the original command, the
transport information pertaining to the request sense command, and the request
sense data.
.SH STRUCTURE MEMBERS
.sp
.in +2
.nf
struct scsi_status       sts_status;          /* SCSI status */
struct scsi_status       sts_rqpkt_status;    /* SCSI status of   
                                                 request sense cmd */
uchar_t                  sts_rqpkt_reason;    /* reason completion */
uchar_t                  sts_rqpkt_resid;     /* residue */
uint_t                   sts_rqpkt_state;     /* state of command */
uint_t                   sts_rqpkt_statistics;/* statistics */
struct scsi_extended_sense sts_sensedata;      /* actual sense data */
.fi
.in -2

.sp
.LP
\fBsts_status\fR is the \fBSCSI\fR status of the original command. If the
status indicates a \fBcheck\fR \fIcondition\fR, the transport layer might have
performed an auto request sense command.
.sp
.LP
\fBsts_rqpkt_status\fR is the \fBSCSI\fR status of the request sense command.
\fBsts_rqpkt_reason\fR is the completion reason of the request sense command.
If the reason is not \fBCMD_CMPLT\fR, then the request sense command did not
complete normally.
.sp
.LP
\fBsts_rqpkt_resid\fR is the residual count of the data transfer and indicates
the number of data bytes that have not been transferred. The auto request sense
command requests \fBSENSE_LENGTH\fR bytes.
.sp
.LP
\fBsts_rqpkt_state\fR has bit positions representing the five most important
statuses that a  \fBSCSI \fRcommand can go obtain.
.sp
.LP
\fBsts_rqpkt_statistics\fR maintains transport-related statistics of the
request sense command.
.sp
.LP
\fBsts_sensedata\fR contains the actual sense data if the request sense command
completed normally.
.SH SEE ALSO
.sp
.LP
\fBscsi_ifgetcap\fR(9F), \fBscsi_init_pkt\fR(9F),
\fBscsi_extended_sense\fR(9S), \fBscsi_pkt\fR(9S)
.sp
.LP
\fIWriting Device Drivers\fR