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Posted by Andrew Ho on March 5, 2005, 11:34 am
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Hello,
I've uploaded a new module Sys::PortIO 0.1 to CPAN. This module
provides Perl access via XS glue to the OS-dependent routines necessary
to do arbitrary port I/O; on Unix-like systems, this is generally the
inb() and outb() functions, as well as functions to obtain permission
to use them. These functions are useful for doing things like
controlling arbitrary interfaces to parallel, serial, or joystick
ports.
Here is the text of the README that ships with this module:
This is Sys::PortIO, a Perl interface to direct port I/O functions (on
Unix-like systems, inb() and outb() and friends). You can install it in
the typical CPAN module manner:
% perl Makefile.PL
% make
% make test
# make install
You can find the latest distribution at the following URL:
http://www.zeuscat.com/andrew/src/Sys-PortIO-0.1.tar.gz
You can also find it at your friendly neighborhood CPAN:
http://www.perl.com/CPAN-local/modules/by-module/Sys/
Appended below is are the Changes and POD documentation from PortIO.pm.
Contact Andrew Ho (andrew@zeuscat.com) with comments or bug reports.
========================================================================
Revision history for Perl extension Sys::PortIO.
0.1 - March 4, 2005
* Original version, created by Andrew Ho (andrew@zeuscat.com),
rolled.
========================================================================
NAME
Sys::PortIO - perform direct port I/O from Perl
SYNOPSIS
use Sys::PortIO;
port_open($portnum);
write_byte($portnum, $value);
$value = read_byte($portnum);
port_close($portnum);
DESCRIPTION
This module provides a Perl interface to the low-level port I/O
operations provided by Linux, FreeBSD, or OpenBSD. Among other
things, this is useful for writing Perl scripts that interface
with parallel, serial, or joystick ports.
BUGS
On some systems (for example, Linux), doing a port read or write
on an unopened port will cause a segmentation fault.
TODO
Support optional range argument to "port_open()".
Set $! on errors, instead of dying (sometimes with a segfault).
Alternately, automatically open ports as needed.
SEE ALSO
Linux I/O port mini-HOWTO:
<http://www.faqs.org/docs/Linux-mini/IO-Port-Programming.html>
On Linux or other glibc systems, see ioperm(2), inb(2), and
outb(2). FreeBSD uses /dev/io for port access. On OpenBSD and
NetBSD, see i386_iopl(2) and sysarch(2).
AUTHOR
COPYRIGHT AND LICENSE
Copyright (C) 2005 by Andrew Ho.
This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself, either Perl
version 5.6.0 or, at your option, any later version of Perl 5
you may have available.
Please let me know if there are any questions or comments. Thanks!
Humbly,
Andrew
-----------------------------------------------------------------------
'Twas brillig, and the slithy toves Andrew Ho
Did gyre and gimble in the wabe. andrew@zeuscat.com
All mimsy were the borogoves,
And the mome raths outgrabe. http://www.zeuscat.com/andrew/
-----------------------------------------------------------------------
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