alt Hacker News>Title says Unix,
You're misinterpreting the title. The author didn't intend "Unix" to literally mean only the official AT&T/TheOpenGroup UNIX® System to the exclusion of Linux.
The first sentence of "UNIX-like" makes that clear : >This is a catalog of things UNIX-like/POSIX-compliant operating systems can do atomically,
Further down, he then mentions some Linux specifics : >fcntl(fd, F_GETLK, &lock), fcntl(fd, F_SETLK, &lock), and fcntl(fd, F_SETLKW, &lock) . [...] There is a “mandatory locking” mode but Linux’s implementation is unreliable as it’s subject to a race condition.
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Bit rot alert: Linux doesn't even have mandatory file locks these days.
Linux-specific open file description locks could be brought up in a modern version of TFA though.
Except POSIX doesn't specify some of them as happening atomically.
Many people write UNIX/POSIX without ever reading what it says.
But I also don't think the auther meant Things you can do in Linux but not Unix
Sounds like the key term then is probably this:
> POSIX-compliant
Which, FWIW, doesn't mean Linux. AFAIK there is no Linux distro that's fully compliant, even before you worry about the specifics of whether it's certified as compliant.
They aren’t misinterpreting the title, the title is incorrect.