My guess is that you would have to explicitly export F_NOCACHE as you do with other flags according to the documentation.

use Fcntl qw(F_GETFL F_SETFL O_NONBLOCK);

[download]

So yours would be:

use Fcntl qw(F_NOCACHE);

[download]

I don't have anything with iOS to be test it.

In reply to Re: macOS Fcntl.pm missing F_NOCACHE by Bod
in thread macOS Fcntl.pm missing F_NOCACHE by bernuli

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