[Igrom]

>fcntl(fd, F_GETLK, &lock), fcntl(fd, F_SETLK, &lock), and fcntl(fd, F_SETLKW, &lock)

There's also `flock`, the CLI utility in util-linux, that allows using flocks in shell scripts.

[cachius]

What are flocks in this context? Surely not a number of sheep...

[gbacon]

https://man.openbsd.org/flock.2

https://man7.org/linux/man-pages/man2/flock.2.html

[ncruces]

File locks.

[pjmlp]

In UNIX/POSIX file locks are advisory, not enforced, it only works if all processes play ball.

[zbentley]

Sure, but the discussion is around whether they’re atomic, not whether they’re advisory.

[zbentley]

Aren’t flock and POSIX locks backed by totally different systems?

[zbentley]

Too late to edit, but it appears that they are per this comment on a different article and the documentation it references: https://news.ycombinator.com/item?id=46607265