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