Re: Fedora 22, Emacs Shell Warning: no access to tty (Inappropriate ioctl for device).

I want to add one more thing. Regular Emacs doesn''t exhibitthis 
problem, tcsh shells work fine in Emacs.

On 09/07/2015 01:54 PM, Stephen J. Turnbull wrote:
> B. Joshua Rosen writes:
>
>   > The Fedora Xemacs maintainer suggested that I contract you directly
>   > about this problem. Opening a shell in Xemacs on Fedora 22 gets the
>   > following error,
>   >
>   > Warning: no access to tty (Inappropriate ioctl for device).
>   > Thus no job control in this shell.
>   >
>   > I use tcsh as my shell, the problem is tcsh specific. This problem is
>   > limited to Fedora 22, there is no problem on Fedora 21. Here is a link
>   > to the bugzilla report
>   >
>   > https://bugzilla.redhat.com/show_bug.cgi?id=1222897
>
> Works for me on Mac OS X (both process-connection-types, but I suspect
> Mac doesn't have ptys? as it defaults to nil, in which case this is a
> no-op) and on Gentoo Linux (with process-connection-type t, sh and
> tsch both work as expected, on nil, both fail as above).
>
> Two things I can think of.  First is that somehow tcsh is disabling
> use of ptys, which are the preferred way to communicate with
> subprocesses on Linux, and using pipes instead.  The second is Vin's
> change where he moved disconnect_controlling_terminal() later in
> unix_create_process (process-unix.c).  If playing with those doesn't
> help, I don't have a suggestion.  The process code is hairy, and
> otherwise it hasn't been touched in a decade or so.  It also looks a
> lot like Emacs's (to the extent that I can tell; there are various
> differences in factoring).
>
> By the very fact that it hasn't changed in a while, it's quite
> possible that the appropriate place to fix this bug is in XEmacs, but
> I suppose there's a good chance that the fastest way to localize the
> problem is to figure out what changed in Fedora and correlate that
> with the corresponding functionality in XEmacs.  Has anybody asked the
> tcsh channels?
>
> Have you tried tcsh in GNU Emacs?
>
> @Jerry: the last person to do significant work on the process code was
> Martin, I think.

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