daemon(8)

11 Mar 2005

I've been trying to think of a good way to start the exim greylistd which does not by default run in the background.

I remember reading about daemonize long ago and found it again via Google. I checked if my FreeBSD machines has this command and stumbled on daemon(8).

It was introduced around FreeBSD 4.7 and supports running any command in the background complete with pid file support.

I put the following command in a simple rc script so now I have a full start, stop, restart style command for greylistd.

/usr/sbin/daemon -cf -p /var/run/greylistd.pid /usr/local/sbin/greylistd

Posted by R.I.Pienaar on Friday, March 11, 2005 at 9:56 PM

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2 Comments

Does nohup behave differently from daemon?

Colin Alston | March 14, 2005 4:27 AM | Reply

Yes, nohub just makes it ignore the -HUP signal in kills and redirects any output to nohup.out.

Daemon supports changing directory to / (to prevent the daemon from holding mounted volumes) and it completely discard output by sending it to /dev/null. It also supports writing of pid files, great for stopping processes.

R.I.Pienaar | March 14, 2005 8:17 AM | Reply

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