From: Peter Dyballa <Peter_Dyballa@Freenet.DE>
To: Andreas Schwab <schwab@suse.de>
Cc: emacs-pretest-bug@gnu.org
Subject: Re: 23.0.50; source of warning in *shell* buffer
Date: Fri, 19 Oct 2007 16:27:22 +0200 [thread overview]
Message-ID: <98D3E112-2FC1-4065-9401-6179A3EF27D7@Freenet.DE> (raw)
In-Reply-To: <jeejfr2rx2.fsf@sykes.suse.de>
Am 19.10.2007 um 14:46 schrieb Andreas Schwab:
> Peter Dyballa writes:
>
>> When I invoke M-x shell the new buffer starts with:
>>
>> Warning: no access to tty (Bad file descriptor).
>> Thus no job control in this shell.
>>
>> Where is the source for these messages?
>
> They are most likely coming from the shell.
Ahh, strings reveals them in tcsh! Except the 'Bad file descriptor'
string, which was found in:
./src/w32.c:2952: WSAEBADF , "Bad file descriptor",
I am sure that I am not using Losedows ...
>
>> What are the criterions for this warning?
>
> Probably the shell could not open /dev/tty, ie. it has no controlling
> terminal. That happens when the process is using pipes instead of
> ptys.
Indeed. Tty does not return a pty's name, and lsof shows that FILE
structs are in use:
COMMAND PID USER FD NAME
tcsh 9977 pete 16r 0x04bb9380 file struct, ty=0x6, op=0x3823ec
tcsh 9977 pete 17w 0x04791b40 file struct, ty=0x6, op=0x3823ec
tcsh 9977 pete 18w 0x04bb9fb0 file struct, ty=0x6, op=0x3823ec
tcsh 9977 pete 19r 0x0529d4c0 file struct, ty=0x6, op=0x3823ec
>
>> Which elements are necessary for job control?
>
> The shell needs to be able to manipulate the process group of the
> controlling terminal.
Is this really needed in the *shell* buffer? Term offers a more
complete terminal emulation. In *terminal* buffer I cannot see the
warnings and tty returns a pty's name.
--
Mit friedvollen Grüßen
Pete
The day Microsoft makes something that doesn't suck
is the day they start selling vacuum cleaners.
Ernest Jan Plugge
next prev parent reply other threads:[~2007-10-19 14:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-19 12:17 23.0.50; source of warning in *shell* buffer Peter Dyballa
2007-10-19 12:46 ` Andreas Schwab
2007-10-19 14:27 ` Peter Dyballa [this message]
2007-10-19 16:06 ` Eli Zaretskii
2007-10-19 22:55 ` Peter Dyballa
2007-10-19 16:18 ` Jason Rumney
2007-10-19 14:13 ` Stefan Monnier
2007-10-19 15:12 ` Peter Dyballa
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