Re: add non-option reordering to in-tree getopt_long

At Wed, 14 Jun 2023 15:46:08 -0700, Nathan Bossart <nathandbossart(at)gmail(dot)com> wrote in
> On Wed, Jun 14, 2023 at 03:11:54PM -0700, Noah Misch wrote:
> > Here's some output from this program (on AIX 7.1, same output when compiled
> > 32-bit or 64-bit):
> >
> > $ ./a.out a b c d e f
> > f e d c b a ./a.out
>
> Thanks again.
>
> > Interesting discussion here, too:
> > https://github.com/libuv/libuv/pull/1187
>
> Hm. IIUC modifying the argv pointers on AIX will modify the process title,
> which could cause 'ps' to temporarily show duplicate/missing arguments
> during option parsing. That doesn't seem too terrible, but if pointer
> assignments aren't atomic, maybe 'ps' could be sent off to another part of
> memory, which does seem terrible.

Hmm, the discussion seems to be based on the assumption that argv[0]
can be safely redirected to a different memory location. If that's the
case, we can prpbably rearrange the array, even if there's a small
window where ps might display a confusing command line, right?

regards.

--
Kyotaro Horiguchi
NTT Open Source Software Center