On 2026/02/06 15:59, Thomas Kupper wrote: > > On 06.02.2026 15:01, Stuart Henderson wrote: > > On 2026-02-06, Thomas Kupper <[email protected]> wrote: > > > Hi, > > > > > > I'm playing around with Chrony and used setproctitle() to set the title > > > of the involved process (main, helper and NTS helper). > > > > > > And I can't figure out how to receive the command line the application > > > was started with after using setproctitle(). > > > > > > E.g. running 'ps -o command' outputs before setproctitle(): > > > > > > $ ps -auxo command | fgrep chronyd > > > _chrony 43240 <snip> chronyd -F 0 -u _chrony -d -f /etc/chrony.conf > > > _chrony 77494 <snip> chronyd -F 0 -u _chrony -d -f /etc/chrony.conf > > > root 18016 <snip> chronyd -F 0 -u _chrony -d -f /etc/chrony.conf > > > > > > running 'ps -o command' outputs after setproctitle(): > > > > > > $ ps -auxo command | fgrep chronyd > > > _chrony 47331 <snip> chronyd: server (chronyd) > > > _chrony 64136 <snip> chronyd: NTS helper (chronyd) > > > root 56489 <snip> chronyd: PRV helper (chronyd) > > > > > > What tool would show the calling command line? Would someone be able to > > > nudge me into the right direction? > > > > You would need to save it before calling setproctitle (depending on > > exactly what you want this for, you could possibly change the > > setproctitle call to add the contents of argv) > > Thank you Stuart, I will then not set the process title for the first one > (server). That seems the easiest way. Mmh or add it at the end as you > suggested (like pflogd).
btw, pflogd is extra-special, and builds its own title string based on what the flags do, but doesn't use them directly - hence the poor handling in rc scripts :) skipping for the first process seems sane, and I guess ps -f / pstree will make it fairly easy to associate helpers with the main process if needed. > I thought that maybe something similar to /proc/<proc id>/cmdline would > exists and I was just to thick to find it. > > It was generally meant as an easy way to see the command line arguments used > to start a application, mostly for debugging purposes (httpd, sshd, ).
