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Wrapper around unveil(2) syscall on OpenBSD.
see https://man.openbsd.org/unveil.2 for details.
val supported : bool
boolean indicating if unveil(2) is supported.
val add : string -> string -> unit
add calls unveil(path, permissions).
add
Invalid_argument
on EINVAL error.
Failure
on others errors, with errno in string.
val lock : unit -> unit
lock calls unveil(NULL, NULL) and lock any futher usage of add.
lock