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<p class="MsoNormal"><span style="font-size:11.0pt">> > I think the SIGHUP must come from the new PID 1.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> I don't know if this will help you, however here is a program that I<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> wrote last year that starts a service in the initramfs, it survives<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> the systemd killing spree during the transition to the root<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> filesystem, a new copy of the program is started from the root<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> filesystem, the previous running state is passed from the initramfs to<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> the version started from the root filesystem, and the version started<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> from the initramfs is gracefully shut down. The program does not have<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> the SIGHUP issue that you describe, so maybe there's something here<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> that may help you.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">> <a href="https://github.com/masneyb/early-service-example">
https://github.com/masneyb/early-service-example</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks very much for this pointer!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I will take a closer look at your code since I would indeed prefer to start my process (and systemd-bootchart) in the initrd.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I had tried doing that using "rdinit=" and did observe that the SIGHUP problem does not occur in that case (btw, it is SIGHUP followed by SIGCONT).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">For systemd-bootchart, after it does some initial set-up, it only reads files under /proc (and it keeps a directory stream to /proc open).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Unfortunately, the switch-root operation somehow causes /proc/schedstat to become inaccessible, so systemd-bootchart is broken with "rdinit=" as well.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">-James M<o:p></o:p></span></p>
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