NAME

     pt — SCSI processor type driver

SYNOPSIS

     device pt

DESCRIPTION

     The pt driver provides support for a SCSI processor type device.  These are usually scanners
     and other devices using the SCSI link as a communication interface with device specific
     commands embedded in the data stream.

     A SCSI adapter must be separately configured into the system before this driver can be used.

     This device supports read(2) and write(2), and the ioctl(2) calls described below.

IOCTLS

     The following ioctl(2) calls are supported by the pt driver.  They are defined in the header
     file <sys/ptio.h>.

     PTIOCGETTIMEOUT  This ioctl allows userland applications to fetch the current pt driver read
                      and write timeout.  The value returned is in seconds.

     PTIOCSETTIMEOUT  This ioctl allows userland applications to set the current pt driver read
                      and write timeouts.  The value should be in seconds.

FILES

     /dev/ptN    the Nth processor device.

SEE ALSO

     cam(4)

HISTORY

     The pt driver appeared in FreeBSD 2.1.