[Bug libc/16285] thread-safe file locking (using lock file)

[bugdal at aerifal dot cx]

https://sourceware.org/bugzilla/show_bug.cgi?id=16285

--- Comment #3 from Rich Felker <bugdal at aerifal dot cx> ---
Normally for this kind of thing, you write into a unique temporary file and
rename (which is atomic) to the actual name only when the file is complete.
This avoids all the issues you're concerned about, I believe.

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