On Tue, 23 Apr 2019 13:35:44 +0100, Ralph Corderoy said:
> It's not the only one, e.g. docs/historical/mh-6.8.5/uip/post.c has
>
> 2622 if (fd != 0)
> 2623 (void) dup2 (fd, 0);
> 2624 (void) freopen ("/dev/null", "w", stdout);
> 2625 (void) freopen ("/dev/null", "w", stderr);
> 2626 if (fd != 3) /* backwards compatible... */
> 2627 (void) dup2 (fd, 3);
> 2628 closefds (4);
>
> Note the comment.
The *real* WTF there is that the code doesn't actually know if fd 3 is
known to be open on a file that should, or if it's just a stray leaked fd.
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