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

[H. Peter Anvin]

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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/