Date: Tue, 07 Sep 2021 16:20:30 -0700 From: Cy Schubert <Cy.Schubert@cschubert.com> To: freebsd-current@freebsd.org, Steve Kargl <sgk@troutmask.apl.washington.edu> Subject: Re: killall, symlinks, and signal delivery? Message-ID: <6C88F561-B045-4D09-B61D-D91096AF0C4B@cschubert.com> In-Reply-To: <20210907224242.GA19450@troutmask.apl.washington.edu>
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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. -- Pardon the typos and autocorrect, small keyboard in use. Cy Schubert <Cy.Schubert@cschubert.com> FreeBSD UNIX: <cy@FreeBSD.org> Web: https://www.FreeBSD.org The need of the many outweighs the greed of the few. Sent from my Android device with K-9 Mail. Please excuse my brevity.help
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