Log pipes

I want to write a small C program that accepts piped log entries from
Apache and does things with them (specifically, it will parse the
entries and dump them into a database). How does the piped logging
lifecycle work? Is one logging process started for each apache process?
Must my C program be threadsafe? Better yet, does anyone know of a
minimal example that does this (just takes Apache log entries from stdin
and parses them)?

Thanks,
Jeremy

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