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Daemon clean up itself when get killed

Time:01-03

I'm try to create a daemon application by following the example :

Creating a daemon in Linux

In the example, there is no operations about the daemon stop.

Therefore, I'm curious about :

  1. How to send stop signal to the daemon ? Or just kill PID directly ?
  2. If the daemon only can stop on killed, should the daemon itself do the cleaning up operations on killed ? Just like close file descriptors, saving parameters, etc.

Thanks in advance.

CodePudding user response:

should the daemon itself do the cleaning up operations on killed ? Just like close file descriptors, saving parameters, etc.

Closing file descriptors is pointless -- they'll be automatically closed by the kernel when the process exits.

For "saving parameters", it depends on what you mean by "parameters". If you mean the command-line arguments, then no: when the daemon is restarted, it will get a fresh copy of these.

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