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From: "Jan D." <jan.h.d@swipnet.se>
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Subject: Re: [angeloff@acm.org: Emacs bug with Solaris 9 (only)]
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>     Now, reading the code it seems to me that p->subtty is unconditionally
>     set to Qnil when the fork of the subprocess succeeds, so the first
>     ioctl will never be executed.
>
> Here's the code that sets subtty.
>
>   /* Record the tty descriptor used in the subprocess.  */
>   if (forkin < 0)
>     XPROCESS (process)->subtty = Qnil;
>   else
>     XSETFASTINT (XPROCESS (process)->subtty, forkin);
>
> It doesn't look like this always sets it to nil, unless
> forkin is always < 0.  Basically, it is not SUPPOSED
> to be always nil, so if you find that it always IS nil,
> there must be a bug somewhere.

But later at the end of the same function (create_process) we have:

       /* vfork succeeded.  */
       ...

         XPROCESS (process)->subtty = Qnil;
         if (forkin >= 0)
           emacs_close (forkin);


	Jan D.