PPUI(4) NetBSD Programmer's Manual PPUI(4)

NAME

ppui

user-space parallel port interface

SYNOPSIS

ppui* at ppbus?

Minor numbering: Unit numbers correspond directly to ppbus numbers.

DESCRIPTION

The ppui driver provides a convenient means for user applications to manipulate the state of the parallel port, enabling easy low-speed I/O operations without the security problems inherent with the use of the /dev/io interface.

The programming interface is described in ppui(9).

FILES

None: see BUGS.

SEE ALSO

atppc(4), io(4), ppbus(4), ppui(9)

HISTORY

ppui originally appeared in FreeBSD as ppi(4).

AUTHORS

This manual page is based on the FreeBSD ppi(4) manual page and was updated for NetBSD's port by Gary Thorpe.

BUGS

• The inverse sense of signals is confusing.
• The ioctl() interface is slow, and there is no way (yet) to chain multiple operations together.
• ppui needs to be assigned a major device number manually. The device special file also needs to be created manually.

February 16, 2003