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

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.

Thanks
Khai Doan
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