parallel(HW)

parallel -- parallel interface device driver

Description

The parallel port (lp) driver supports both the primary (monochrome) and secondary parallel printer adapters simultaneously. Up to two printers are supported. If an adapter for a printer is not installed, an attempt to open it will fail. The close waits until all output is completed before returning to the user. The lp driver allows only one process at a time to write to the adapter. If it is already busy, an open for writing will return an error. However, the driver allows multiple opens to occur if they are read-only.

The parallel printer adapters are character devices. The minor device number corresponds to the primary or secondary parallel printer adapter. Thus, minor device 0 corresponds to the primary parallel printer adapter, while minor device 1 corresponds to the secondary adapter.

The parallel port behaves as described in termio(M).

Files

/dev/lp*

References

stty(C), termio(M) ,SH Compatibility In previous releases, the pa device driver provides an interface to the system's ISA and PCI parallel ports via the /dev/lp* special device files. This driver is no longer supported.