scsi(3) [plan9 man page]

SCSI(3) 						     Library Functions Manual							   SCSI(3)

NAME

       scsi - SCSI command interface

SYNOPSIS

       bind #S /dev

       /dev/scsiid
       /dev/0/cmd
       /dev/0/data
       /dev/0/debug
       ...

DESCRIPTION

       The  scsi  interface  is  accessed through a two-level directory.  The scsiid file contains the SCSI id of the host interface, typically 7,
       represented textually.  Some implementations allow this to be changed by writing to the file; in many  cases,  the  higher-order  bits  are
       hardware specific.

       Each SCSI target n (0<=n<=7) is associated with a subdirectory #S/n containing files cmd, data, and debug.  The following steps may be used
       to execute a SCSI command:

	      The command block is written to the cmd file.

	      The data file is either written or read depending on the direction of the transfer.  (A command that involves no	data  transfer	is
	      executed with a zero-length write.)

	      The cmd file is read to retrieve the status of the command, returned as a 4-byte big-endian integer.

       Writing an ASCII to the debug file causes tracing information to be written to /dev/klog; writing a turns the tracing off.

SEE ALSO

       wren(3)

SOURCE

       /sys/src/9/port/devscsi.c
       /sys/src/9/*/scsi.c

																	   SCSI(3)