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Subject:  Re: cygwin Digest 28 Oct 2006 14:33:34 -0000 Issue 5237
Date: Tue, 7 Nov 2006 00:36:16 +0000 (UTC)
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Hari Krishna Dara <haridara <at> gmail.com> writes:

> 
> > ---------- Forwarded message ----------
> > From: Christopher Faylor <cgf-no-personal-reply-please <at> cygwin.com>
> > To: cygwin <at> cygwin.com
> > Date: Sat, 28 Oct 2006 00:16:09 -0400
> > Subject: Re: rxvt: Ctrl+C leaves child process of native processes
> > On Fri, Oct 27, 2006 at 05:40:36PM -0700, Hari Krishna Dara wrote:
> > >When I hit ^C in an rxvt window (no X), it doesn't result in killing
> > >all the child processes.
> > >
> > >In this specific case, I am running ant, either through ant.bat, ant
> > >(shell script) or through a custom perl wrapper (which directly
> > >executes java bypassing  ant.bat or ant).
> > >
> > >When the perl wrapper is used it is started from another batch file,
> > >so here is how the process execution:
> > >- batch starts a perl command
> > >- perl command starts java (ant)
> > >- ant starts another java process
> > >
> > >The process tree as shown by sysinternals' process explorer is:
> > >
> > >bash
> > > cmd
> > >   perl
> > >     java
> > >       java
> > >
> > >When I hit ^C, bash and cmd exit immediately leaving perl and the two
> > >java processes.
> >
> > Cygwin has no way of knowing what the children of non-cygwin
> > subprocesses are.  So, as you've found, if you don't use a Cygwin
> > program, you won't get linux-like signal results.  This shouldn't be
> > *too* surprising.
> 
> I don't completely agree with you. If that is the case, then hitting
> ^C in any bash shell should behave the same, but for bash running in a
> native terminal it works as expected. it is not uncommon for make and
> other build systems to span number of child processes, and it would be
> a havoc if these didn't get killed properly (and would make cygwin
> almost unusable). I believe that the problem has something to do with
> rxvt.
> 


I have a somewhat simpler version of the same issue:

1. Start a bash shell using the standard cywin batch file under XP.  The batch
file contains:

@echo off

C:
chdir C:\cygwin\bin

bash --login -i

2. Run the following command:
rxvt -sl 200 -e bash --login -i


rxvt opens a new window with a bash shell.  Windows reports two bash processes.
 If I use the close button on the rxvt window, the rxvt terminates but both bash
processes remain.  The second process is an orphaned child from rxvt.

This was done using a standard cygwin install onto XP as of 6 Nov 2006.



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