In the launcher, use F_OFD_SETLK if available. Because OFD locks are not per-process, F_OFD_GETLK does not report which process holds the lock, so we use the contents of the lock file instead. Works around a Linux kernel bug where POSIX record locks are lost at execve() if any other threads exist. RELNOTES: None. PiperOrigin-RevId: 171209685
{Fast, Correct} - Choose two
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