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I have been trying to create a daemon using /etc/init.d/myservice and it will call a shell script that contains nohup within the script line.

Will it affect it if I could do service stop later?

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1 Answer

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Nohup just blocks SIGHUP. The rc script to start or stop your daemon could use any signals at all to shut down your process.

This link has a good overview of the things a daemon process needs to do on startup, for example closing stdin, stdout and stderr, detaching itself from the parent and getting a new process group and setting up signal handlers.

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I had managed to throw in nohup within the shell script and the start up part works OK. But when i do /sbin/service myservice stop, the following output shown on the screen even the service did stopped successfully. /sbin/service: line 66: 19466 Terminated env -i LANG="$LANG" PATH="$PATH" TERM="$TERM" "${SERVICEDIR}/${SERVICE}" ${OPTIONS} – d4v1dv00 Sep 29 '11 at 9:49
Incidentally, a lot of daemons nowadays interpret SIGHUP as a command to reload their configuration files. This might be a better use for it than nohup. – Shadur Sep 29 '11 at 10:16
Your wrapper script should redirect stdout and stderr to a log file, and a daemon process should close stdin, stdout and stderr anyway. See the edit for a link to the ins and outs of writing a daemon process. – ConcernedOfTunbridgeWells Sep 29 '11 at 14:40

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