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Is util-linux's flock implemented based on flock() in Linux C API?

Can we tell if a command is being run by a process or not, by looking at the lock file alone? I found that when a command guarded by flock finishes running, there seems no change to the lock file. Here is when it is running and after it finishes running:

$ ls -l ../sleep.flock.file 
-rw-rw-r-- 1 t t 0 Oct 30 14:01 ../sleep.flock.file
$ ls -l ../sleep.flock.file 
-rw-rw-r-- 1 t t 0 Oct 30 14:01 ../sleep.flock.file

Thanks.

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Yes. It is explicitly stated in man 1 flock that flock command uses flock() and man 2 flock notes section says that flock() is implemented by system call since Linux kernel 2.0.

  • Thanks. How about the rest of my questions? – Tim Oct 30 '18 at 18:18
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    @Tim You should ask a single question per post... See the help and docs for U&L it will tell you so. – filbranden Oct 30 '18 at 18:22

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