bug#1688: 23.0.60; ttname returned by system-process-attributes points to nonexisting file

[Eli Zaretskii]

> Date: Tue, 13 Jan 2009 01:17:23 +0800
> From: richardeng <richardeng@foxmail.com>
> Cc: emacs-pretest-bug@gnu.org
> 
> --- sysdep.c.~1.328.~   2009-01-03 07:04:59.000000000 -0800
> +++ sysdep.c    2009-01-13 01:09:56.000000000 -0800
> @@ -3322,7 +3322,7 @@
> 
>              if (MINOR (rdev) >= minor_beg && MINOR (rdev) <= minor_end)
>                {
> -                sprintf (name + strlen (name), "%lu", MINOR (rdev));
> +                sprintf (name + strlen (name), "/%lu", MINOR (rdev));
>                  break;
>                }                                                              
>                                 
It's not that simple: what happens if `name' is something like "ptys"
or "tty"?  We need to generate "ptys2" and "tty39" for them, not
"ptys/2" and "tty/39".

So a more complex logic is required here.

Faced with this difficulty, I decided not to bother, since the value
of `ttname' is not documented to return a valid file name.

Perhaps some Linux guru (which I ain't) can suggest an easy solution.