I could have sworn that there was still a race condition if you open the file for reading, then the OS pre-empts you and hands control to a process that opens it for writing, writes a bunch, then you get handed back the file and attempt to flock it.
I'm too tired to look it up right now, but I thought I read (years back) about a way to atomically open and lock the file descriptor at the same time. The Camel is only talking about sysopen(), which still requires a separate flock().
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