X-Spam-Check-By: sourceware.org Date: Mon, 9 Jan 2006 20:17:24 -0500 (EST) From: Igor Peshansky Reply-To: cygwin@cygwin.com To: Brett Serkez cc: cygwin@cygwin.com Subject: Re: ZoneAlarm Suite popen hang In-Reply-To: <1136853906.20233.251462872@webmail.messagingengine.com> Message-ID: References: <1136853906.20233.251462872@webmail.messagingengine.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On Mon, 9 Jan 2006, Brett Serkez wrote: > [snip] > Using -vvv I see the hang is occuring when ssh executes the > following command: > > sh -c /usr/X11R6/bin/xauth -f /tmp/ssh-OrQEQQHWXE/xauthfile generate 7..0.1:0.0 MIT-MAGIC-COOKIE-1 untrusted timeout 1200 2 > /dev/null > /usr/X11R6/bin/xauth: creating new authority file > /home/brett/.Xauthority > > Running this command by hand, it looks like it is hanging, but actually > it is waiting for the command 'exit' on stdin. Typing exit confirms > this with a return to the parent shell prompt. > > This becomes more obvious when the stderr redirection is removed: > > sh -c /usr/X11R6/bin/xauth -f /tmp/ssh-OrQEQQHWXE/xauthfile generate 8..0.1:0.0 MIT-MAGIC-COOKIE-1 untrusted timeout 1200 > /usr/X11R6/bin/xauth: creating new authority file > /home/brett/.Xauthority Using authority file /home/bserkez/.Xauthority > xauth> > > It looks to me on the surface as if ZoneAlarm is interfering with the > communication between ssh and xauth via the popen(). This isn't > completely dissimilar to pipe issues that have been discussed in other > areas, such as with rsync. > > I'm not sure what the next step would be, looking for ideas. It could also be that the script is assuming that ssh will close stdin. Try adding a redirection of stdin from /dev/null as well (i.e., use sh -c /usr/X11R6/bin/xauth -f /tmp/ssh-OrQEQQHWXE/xauthfile generate 7..0.1:0.0 MIT-MAGIC-COOKIE-1 untrusted timeout 1200 2 > /dev/null < /dev/null ) and see if it helps. If it does, the script is actually buggy, and needs to be fixed. HTH, Igor -- http://cs.nyu.edu/~pechtcha/ |\ _,,,---,,_ pechtcha@cs.nyu.edu | igor@watson.ibm.com ZZZzz /,`.-'`' -. ;-;;,_ Igor Peshansky, Ph.D. (name changed!) |,4- ) )-,_. ,\ ( `'-' old name: Igor Pechtchanski '---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow! "Las! je suis sot... -Mais non, tu ne l'es pas, puisque tu t'en rends compte." "But no -- you are no fool; you call yourself a fool, there's proof enough in that!" -- Rostand, "Cyrano de Bergerac" -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/