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Wrapper around pledge(2) syscall on OpenBSD.
see https://man.openbsd.org/pledge.2 for details.
val supported : bool
boolean indicating if pledge(2) is supported.
val promises : string -> unit
promises calls pledge(value, NULL).
promises
Invalid_argument
on EINVAL error.
Failure
on others errors, with errno in string.
val execpromises : string -> unit
execpromises calls pledge(NULL, value).
execpromises