[1.7] Problem - emacs fails to get shell-command output

Ken Brown kbrown@cornell.edu
Mon Dec 15 15:35:00 GMT 2008

On 12/15/2008 8:52 AM, Corinna Vinschen wrote:
> On Dec 14 16:49, Ken Brown wrote:
>> On 12/11/2008 2:30 PM, Matt Wozniski wrote:
>>> On Thu, Dec 11, 2008 at 1:14 PM, Ken Brown wrote:
>>>> One other thing I've noticed, which I think is unrelated, is that there 
>>>> is a
>>>> glitch in directory listing in emacs under cygwin 1.7:  If you try to 
>>>> list a
>>>> directory with control-x d, very often the directory listing makes it 
>>>> look
>>>> like the directory is empty when it isn't.  Typing "g" (to ask emacs to
>>>> redisplay the directory) usually results in a correct listing.
>>>> [...]
>>> With no knowledge of cygwin's internals, I'd much sooner guess the
>>> changes to the pipe code...
>> I should have just reported the symptom instead of trying to guess the 
>> cause:  Emacs runs the shell command "ls -al" and thinks there's no output. 
>>  Here's a second example.  I used emacs's "ediff" function to compare two 
>> buffers, and it reported (incorrectly) that there were no differences.  So 
>> it seems that emacs called on the shell to run "diff" but didn't get the 
>> output.
> Any chance to create a testcase which reproduces this behaviour without
> involving emacs?  Emacs is hell of a testcase which I won't even touch
> with gloves...

Unfortunately, I have virtually no programming experience.  I was hoping 
the emacs maintainer might be able to help.  Or maybe there are some 
programmers out there who are also emacs users and would be willing to 
try to debug this.  There's a file called callproc.c in the emacs 
source, which deals with "synchronous subprocess invocation"; it might 
be a place to start, but that's just a guess.


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