Open-source solutions for creating a cyclical logfile?

Question

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My google goggles aren't working too well today. I figured this one must have been coded a gazillion times already and was looking for some FOSS code, but couldn't find any.

Before I reinvent the spherical axle-surrounding device, can anyone point me at a URL?

I am coding in C for an embedded system (Atmel UC3), but that shouldn't make any difference, just explain why I need a cyclical logfile (because of limited storage).

I want to log events to a file on an SD card and when the reaches a certain size I want to start writing again at the start. Any URLs for that? (fixed entry size is ok; otherwise it might get nasty on wraparound).

Thanks a 1,000,000 in advance!

Answer 1

Sourceforge has a project called Cyclic Logs which may be what you need.

If not, it's not the hardest thing to implement. Just treat it like a normal cyclic memory space. But instead of having it be resident in memory have it reside on the disk.

( maintain a pointer to the head of the log and the end of the log ( increment as needed ))

Store those as headers to the log or as another flat file.