If you disassociate the process from its parent (via setsid), this won't happen. When you kill your terminal (or exit it any way other than by typing "exit" or "logout"), a HUP signal is sent to the terminal's process group. This means every process that currently is in the shell's process group receives the HUP signal, which effectively kills everything started during that shell session.

The approved way of disassociating a process from its process group is by changing its process group ID (pgid), such as via setsid. See perlipc and my other comment at Re: Is it possible to background a perl script from within itself? for a method to cleanly do this.

In reply to Re: Answer: How do I run a script in the background? How should I run a script as daemon? by Fastolfe
in thread How do I run a script in the background? How should I run a script as daemon? by jeroenes

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