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Re: error while running shell in emacs

Ken Brown <> was heard to say:

On 9/30/2011 10:27 AM, Markus Hoenicka wrote:
CYGWIN_NT-5.1 sbhc123 1.7.9(0.237/5/3) 2011-03-29 10:10 i686 Cygwin

I use some Emacs extensions which execute external programs using
(call-process). This used to work on my previous setup, but it fails on
my current box. The following command run in Emacs reproduces what seems
to be the problem:

(call-process "bash" nil '(t t) nil "-ic" "ls -al")
bash: Kann die Prozessgruppe des Terminals nicht setzen (-1).:
Inappropriate ioctl for device
bash: Keine Job Steuerung in dieser Shell.


Why are you calling bash with the -i option in this context? Your first `nil' causes bash's input to come from /dev/null. Does it make sense to have an interactive shell with input coming from /dev/null? If you remove -i and just run

(call-process "bash" nil '(t t) nil "-c" "ls -al") ,

it works fine with both cygwin 1.7.9 and the latest snapshot.

Maybe there's still a Cygwin bug here; I tested your original command in Linux, and it worked. But omitting -i might at least be a workaround for you.

You're asking the right question here. I tried to trace back where the "-ic" came from. I could find traces of this switch as early as 2004. It was part of a setup which allowed to use Cygwin bash as a shell in NTEmacs (the native GNU Emacs port, and back then the only way to have a GNU Emacs GUI on Windows). I'm pretty sure that I copied the switch from other sources, so I can't tell whether it was necessary back then or if the "-i" part of it simply didn't hurt. Well, it didn't hurt with Cygwin Emacs either until I set up my new box. But as you say, both "-c" and "-lc" work without a problem. Thus omitting the "-i" is probably not a workaround, but simply the proper way of doing things.

Thanks a lot for looking into this.


-- Markus Hoenicka AQ score 38

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