PT(4)

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 communi-
     cation 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 cur-
		      rent pt driver read and write timeouts.  The value
		      should be in seconds.

FILES

     /dev/ptN	 the Nth processor device.

SEE ALSO

     scsi(4)

HISTORY

     The pt driver appeared in FreeBSD 2.1.