pt —
SCSI
processor type driver
device pt
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
<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.
cam(4)
The
pt driver appeared in
FreeBSD
2.1.