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Date: Mon, 13 Nov 2006 11:10:12 -0500
From: Christopher Faylor <cgf-no-personal-reply-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Bash process remains after I close rxvt in certain ways
Message-ID: <20061113161012.GA6263@trixie.casa.cgf.cx>
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On Mon, Nov 13, 2006 at 03:18:56PM +0000, Eric Blake wrote:
>Charles Wilson <cygwin <at> cwilson.fastmail.fm> writes:
>
>> Or what *should* be happening.
>> 
>> So, I think that in src/command.c, right before exit() is called, rxvt 
>> ought to kill its children -- except I thought exit() should do that 
>> already?
>
>http://www.opengroup.org/onlinepubs/009695399/functions/exit.html:
>"Termination of a process does not directly terminate its children. The sending 
>of a SIGHUP signal as described below indirectly terminates children in some 
>circumstances.
>...
>"If the process is a controlling process, the SIGHUP signal shall be sent to 
>each process in the foreground process group of the controlling terminal 
>belonging to the calling process.
>"If the process is a controlling process, the controlling terminal associated 
>with the session shall be disassociated from the session, allowing it to be 
>acquired by a new controlling process.
>"If the exit of the process causes a process group to become orphaned, and if 
>any member of the newly-orphaned process group is stopped, then a SIGHUP signal 
>followed by a SIGCONT signal shall be sent to each process in the newly-
>orphaned process group."
>
>Sounds like you are right - rxvt should be a controlling process, so calling 
>exit() should automatically cause cygwin to send SIGHUP to the process group, 
>and rxvt shouldn't have to do any manual killing.

This is handled in dcrt0.cc:do_exit().  I'm wondering if rxvt is not
dealing with the SIGHUP that cygwin should be sending to it on
CTRL_CLOSE, though.

cgf

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