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Editorial Team
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Asked: 2026-05-13T14:12:47+00:00

I have some daemons that use PID files to prevent parallel execution of my

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I have some daemons that use PID files to prevent parallel execution of my program. I have set up a signal handler to trap SIGTERM and do the necessary clean-up including the PID file. This works great when I test using “kill -s SIGTERM #PID”. However, when I reboot the server the PID files are still hanging around preventing start-up of the daemons. It is my understanding that SIGTERM is sent to all processes when a server is shutting down. Should I be trapping another signal (SIGINT, SIGQUIT?) in my daemon?

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1 Answer

  1. Editorial Team

    Use flock (or lockf) on your pidfile, if it succeeds, you can rewrite the pidfile and continue.

    This SO answer has a good example on how this is done.

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