(Sending again to the list, I mailed Jean-Paul off-list by mistake, sorry).
On Thu, Sep 30, 2010 at 4:01 PM, Jean-Paul Calderone <exar...@twistedmatrix.com> wrote: > You can fix this by resetting the signal disposition of SIGPIPE for > the ping process: > > #!/usr/bin/python > import signal > > def reset(): > signal.signal(signal.SIGPIPE, signal.SIG_DFL) > > from subprocess import check_call > check_call(['ping', 'www.google.com'], preexec_fn=reset) > > Very likely the subprocess module should be resetting the disposition > of signals that Python itself has fiddled with (and resetting any > other unusual state that the child is going to inherit, but nothing > else comes immediately to mind). > -- Thanks, that works for me. Also thanks to Gregory (Python developer) for fixing it so quickly (don't want to litter the bug tracker with thanks). Small annoyance: Though it's fixed with ping, wget still has the problem. However, I compared the two script versions again (test.sh, and test.py) for wget, and actually bash has the same problem as python, so I assume it's a wget bug this time (I'll go report the bug to them next). Is it that unusual to run scripts over non-interactive SSH, and then interrupt with Ctrl+C? :-). So I guess for now I need to keep my previous workaround for now, rather than switching to the preexec_fn syntax. Also, I don't 100% follow that explanation about the pipes. I read a bit more over here: http://en.wikipedia.org/wiki/SIGPIPE And it seems like SIGPIPE would apply in a case like this: ping www.google.com | test.py But I'm not calling ping like that. I guess it applies to regular stream, non-piping operations, too? ie, something like this is happening [ping output] passes through==> [test.py] ==> passes through [ssh] ==> passes through => [more ssh, bash, etc, up to my terminal] And when ssh disappears, then Linux automatically sends ping SIGPIPE, because it's output can no longer be "passed through" to anywhere. Pretty interesting, but I'm a noob with this stuff. If I want to learn more, would this WP article (and linked pages) be a good place to learn more? http://en.wikipedia.org/wiki/Signal_%28computing%29 Thanks, David. -- http://mail.python.org/mailman/listinfo/python-list
