scsi_status(9S) 					    Data Structures for Drivers 					   scsi_status(9S)

NAME

       scsi_status - SCSI status structure

SYNOPSIS

       #include <sys/scsi/scsi.h>

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI)

DESCRIPTION

       The  SCSI-2standard defines a status byte that is normally sent by the target to the initiator during the status phase at the completion of
       each command.

STRUCTURE MEMBERS

	 uchar	sts_scsi2    :1;       /* SCSI-2 modifier bit */
	 uchar	sts_is	     :1;       /* intermediate status sent */
	 uchar	sts_busy     :1;       /* device busy or reserved */
	 uchar	sts_cm	     :1;       /* condition met */
	 ucha	sts_chk      :1;       /* check condition */

       sts_chk indicates that a contingent allegiance condition has occurred.

       sts_cm is returned whenever the requested operation is satisfied

       sts_busy indicates that the target is busy. This status is returned whenever a target is unable to  accept  a  command  from  an  otherwise
       acceptable initiator (that is, no reservation conflicts). The recommended initiator recovery action is to issue the command again later.

       sts_is is returned for every successfully completed command in a series of linked commands (except the last command), unless the command is
       terminated with a check condition status, reservation conflict, or command terminated status. Note that host bus adapter  drivers  may  not
       support linked commands (see scsi_ifsetcap(9F)). If sts_is and sts_busy are both set, then a reservation conflict has occurred.

       sts_scsi2  is  the SCSI-2 modifier bit. If sts_scsi2 and sts_chk are both set, this indicates a command terminated status. If sts_scsi2 and
       sts_busy are both set, this indicates that the command queue in the target is full.

       For accessing the status as a byte, the following values are appropriate:

       STATUS_GOOD

	   This status indicates that the target has successfully completed the command.

       STATUS_CHECK

	   This status indicates that a contingent allegiance condition has occurred.

       STATUS_MET

	   This status is returned when the requested operations are satisfied.

       STATUS_BUSY

	   This status indicates that the target is busy.

       STATUS_INTERMEDIATE

	   This status is returned for every successfully completed command in a series of linked commands.

       STATUS_SCSI2

	   This is the SCSI-2 modifier bit.

       STATUS_INTERMEDIATE_MET

	   This status is a combination of STATUS_MET and STATUS_INTERMEDIATE.

       STATUS_RESERVATION_CONFLICT

	   This status is a combination of STATUS_INTERMEDIATE and STATUS_BUSY, and it is returned whenever an initiator attempts to access a log-
	   ical unit or an extent within a logical unit is reserved.

       STATUS_TERMINATED

	   This  status  is  a	combination  of  STATUS_SCSI2  and STATUS_CHECK, and it is returned whenever the target terminates the current I/O
	   process after receiving a terminate I/O process message.

       STATUS_QFULL

	   This status is a combination of STATUS_SCSI2 and STATUS_BUSY, and it is returned when the command queue in the target is full.

SEE ALSO

       scsi_ifgetcap(9F), scsi_init_pkt(9F), scsi_extended_sense(9S), scsi_pkt(9S)

       Writing Device Drivers

SunOS 5.11							    30 Aug 1995 						   scsi_status(9S)