At one point, prctl always required five arguments. At some point
thereafter, it became a variadic function. Some of the PR_*(2const) man
pages recognize it as a variadic function, such as
PR_SET_DUMPABLE(2const), which states that you can use something like
`prctl(PR_SET_DUMPABLE, 1L);` without problems. On the other hand,
PR_SET_NO_NEW_PRIVS(2const) documents the only allowable method of use
as `prctl(PR_SET_NO_NEW_PRIVS, 1L, 0L, 0L, 0L);`, which looks like the
non-variadic form is still being assumed.

Is there some historical reason that three trailing 0L arguments must
or at least should be passed? Or is the manpage simply out of date? I'd
be happy to send patches for this and other prctl functions that are
mistakenly non-variadic if there is a need to. If there is a historical
reason to pass three trailing 0L arguments, maybe that reason could be
documented.

Thanks for your time,

--
Aaron