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pt -- SCSI processor type driver
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
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
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.
/dev/ptN the Nth processor device.
The pt driver appeared in FreeBSD 2.1.