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Aug 11, 2016 at 11:03 comment added user147505 "It inverts single bits of permissions if they are set". Read carefully please. As for the system calls, I'm not that advanced.
Aug 11, 2016 at 10:56 comment added ilkkachu Newly created files take permissions from the system call creating them, not their parent (except if you mean ACL:s, but you didn't mention them.) Also, umask doesn't invert any bits, it clears (masks) them. Inverting would imply that a zero could also turn into a one. (though I guess "inhibit" could be used in the same sense here, but it doesn't feel usual in this context.)
Aug 11, 2016 at 9:23 history edited user147505 CC BY-SA 3.0
added 18 characters in body
Aug 11, 2016 at 9:15 history answered user147505 CC BY-SA 3.0