1. Introduction
This is the Linux Serial Programming HOWTO. All about how to program communications with other
devices / computers over a serial line under Linux. Different techniques are explained: Canonical I/O (only
complete lines are transmitted/received), asyncronous I/O, and waiting for input from multiple sources.
This is the first update to the initial release of the Linux Serial Programming HOWTO. The primary purpose
of this update is to change the author information and convert the document to DocBook format. In terms of
technical content, very little if anything has changed at this time. Sweeping changes to the technical content
aren't going to happen overnight, but I'll work on it as much as time allows.
If you've been waiting in the wings for someone to take over this HOWTO, you've gotten your wish. Please
send me any and all feedback you have, it'd be very much appreciated.
All examples were tested using a i386 Linux Kernel 2.0.29.
1.1. Copyright Information
This document is copyrighted (c) 1997 Peter Baumann, (c) 2001 Gary Frerking and is distributed under the
terms of the Linux Documentation Project (LDP) license, stated below.
Unless otherwise stated, Linux HOWTO documents are copyrighted by their respective authors. Linux
HOWTO documents may be reproduced and distributed in whole or in part, in any medium physical or
electronic, as long as this copyright notice is retained on all copies. Commercial redistribution is allowed and
encouraged; however, the author would like to be notified of any such distributions.
All translations, derivative works, or aggregate works incorporating any Linux HOWTO documents must be
covered under this copyright notice. That is, you may not produce a derivative work from a HOWTO and
impose additional restrictions on its distribution. Exceptions to these rules may be granted under certain
conditions; please contact the Linux HOWTO coordinator at the address given below.
In short, we wish to promote dissemination of this information through as many channels as possible.
However, we do wish to retain copyright on the HOWTO documents, and would like to be notified of any
plans to redistribute the HOWTOs.
If you have any questions, please contact <linux−howto@metalab.unc.edu>
1.2. Disclaimer
No liability for the contents of this documents can be accepted. Use the concepts, examples and other content
at your own risk. As this is a new edition of this document, there may be errors and inaccuracies, that may of
course be damaging to your system. Proceed with caution, and although this is highly unlikely, the author(s)
do not take any responsibility for that.
All copyrights are held by their by their respective owners, unless specifically noted otherwise. Use of a term
in this document should not be regarded as affecting the validity of any trademark or service mark.
1. Introduction 1
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