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.