Date: Tue, 7 Sep 2021 17:00:36 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Cy Schubert <Cy.Schubert@cschubert.com> Cc: freebsd-current@freebsd.org Subject: Re: killall, symlinks, and signal delivery? Message-ID: <20210908000036.GA24175@troutmask.apl.washington.edu> In-Reply-To: <6C88F561-B045-4D09-B61D-D91096AF0C4B@cschubert.com> References: <20210907224242.GA19450@troutmask.apl.washington.edu> <6C88F561-B045-4D09-B61D-D91096AF0C4B@cschubert.com>
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On Tue, Sep 07, 2021 at 04:20:30PM -0700, Cy Schubert wrote: > On September 7, 2021 3:42:53 PM PDT, Steve Kargl <sgk@troutmask.apl.washington.edu> wrote: > >I have stumbled about a quandry, which I hope someone > >can shed some light upon. In my day job, I often > >generate a sequence of images and display these images > >with ImageMagick's display command. From my csh prompt, > >a quick and dirty foreach() loop > > > >% foreach i (*.png) > >> display $i & > >> sleep 3 > >> end > > > >Instead of moving the cursor to each image and hitting > >'q' to close the images. I normally kill all of the > >processes at one time. This used to work: > > > >% killall display > > > >Now I geit, for example, > > > >% display z.miff & > >% killall display > >No matching processes belonging to you were found > >% ps -Ukargl | grep display > >19463 1 S 0:00.02 display z.miff (magick) > >19465 1 S+ 0:00.00 grep display > >% ls -l /usr/local/bin/display > >lrwxr-xr-x 1 root wheel - 6 Jun 1 14:18 /usr/local/bin/display@ -> magick > > > >So, there are two possibilities: > >(1) display was once an independent program and not a > > symlink to magick. Thus, killall just worked. Or, > >(2) killall no longer works because command associated > > with process 19463 is not really 'display' and the > > symlink isn't resolved to actually kill 'magick'. > > > >So, just chekcing (2), here. Is this a change in behvior > >for FreeBSD? > > > > It's likely your app is replacing its process name > (argv[0]) to something else. ps auxww may give you a > hint what it might be now. Yes, that's likely. So, it could be a change in behavior for ImageMagick. Your suggested ps command doesn't provide anything new. ps shows the command that I entered, namely, 'display coarse_sand.jpg'. But, it also shows '(magick)', which is the actual name of the program. I'm guessing argv[0] = "magick". % ps 24333 7 I 0:00.43 display coarse_sand.jpg (magick) % killall magick does the job of killing the displayed image. -- Steve
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