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Message-ID: <8F23E55D511AD5119A6800D0B76FDDE11E101A@cpex3.channelpoint.com>
From: Troy Noble <troy DOT noble AT channelpoint DOT com>
To: "'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject: RE: Brainstorming a fix for CTRL-C handling in an emacs shell buf
	 fer (non-TTY)
Date: Mon, 7 May 2001 12:00:48 -0600 
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I was hoping you wouldn't say that ;->

I will look at it some more.  I spent many hours looking at tty.cc,
fhandler_termios.cc, dtable.cc, and related code over the weekend, and
got wound around the axle trying to figure out where the pgid of the
tty was getting set.  I couldn't get the watch point to tell me when/where
it was getting changed.  And as you know printf is problematic during the
early startup sections where it's setting up the tty itself.

You're right, t->getpgid() should be 0 for a process with a pipe for stdin.
There's definitely a bug lurking in there somewhere.

Will let you know what I find out.

BTW, do you want me to jump over to the cygwin developer list?
I just don't want to annoy folks with the traffic if this is not
the appropriate place to get feedback for this type of a debugging
exercise.

And thanks for your patience.  This is my first "dive" into the internals
of the cygwin DLL code.

Troy

-----Original Message-----
From: Christopher Faylor [mailto:cgf AT redhat DOT com]
Sent: Monday, May 07, 2001 11:23 AM
To: 'cygwin AT cygwin DOT com'
Subject: Re: Brainstorming a fix for CTRL-C handling in an emacs shell
buf fer (non-TTY)


On Sun, May 06, 2001 at 10:16:38PM -0600, Troy Noble wrote:
>Christopher,
>
>Looks like t->getpgid() is OK,  it's the
>
>   t->getpgid () != myself->pid
>
>that's causing the behavior... and I think I understand why
>now.  Thanks for leading me in the right direction.
>
>What do you think about the patch below for exceptions.cc
>instead?  No extra environment variables required this time ;->

You're still fixing the symptom rather than the problem.

If the program doesn't have a controlling tty then t->getpgid should be
zero.  If it isn't zero, then I want to know why it isn't zero.

>to kill other non-cygwin child processes (like java.exe for example)
>when running bash in a shell buffer.  They probably had CYGWIN=tty
>set.  You probably already knew that,

No, I didn't know that.  It's difficult to understand why anyone would
do something that dumb.  If they do, they get what they paid for.

Or, rather, I guess I'll get what they paid for because then they'll
send email whining about cygwin instabilities.

cgf

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