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Re:Some Programming Language Ideas by pjc50 on Thursday January 09, 2025 @10:35AM (#42646650)
Possibly the nearest to applying capabilities to C is pointer authentication: https://lwn.net/Articles/718888/

(This is one of those times where the C memory model as described in the spec is very different from the mental PDP-11 that C programmers actually use to reason about)

Re:Some Programming Language Ideas by naasking on Thursday January 09, 2025 @07:07PM (#42651151)
C's file descriptors are capabilities.
Re:Some Programming Language Ideas by dwattttt on Friday January 10, 2025 @01:42AM (#42653233)
CheriBSD is definitely closer: https://www.cheribsd.org/. Or one of the other CHERI projects.