linux-kernel - Re: How to create a fixed length character/block device/file ?

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Message-ID: <45BA6961.2060307@zytor.com>
Date:	Fri, 26 Jan 2007 12:49:37 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Khai Doan <khai@...ius.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: How to create a fixed length character/block device/file ?

Khai Doan wrote:
> Sorry if this is the wrong list.  I've search google, but have not found 
> solution to my problem.
> 
> I have a long running application which split out lots of debugging 
> information.  I can't redirect the output to a regular file because that 
> file would grow and eat up all the diskspace.  I can't redirect to 
> /dev/null.  What I want is the last 1MB of the output before my 
> application terminated.  So I need to create a special file / device on 
> the system.  Please tell me if  there is an existing device that I can 
> use, or point me in the right direction so that I can role my own device.
> 

Create a FIFO (see "man mkfifo"), and write a program that reads the 
FIFO and retains the information you're interested in.

	-hpa
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