I have a server here, running several processes, each process is compiled and run based on a configuration file. Currently I am trying to develop a daemon such that when I receive an update of the configuration file, I would be able to know that there is a new update coming, to stop the process, recompile and run it again.

The problem is, I do not know how should I tell the daemon that there is update for one of the process (how to detect the new file) . Do you have any idea on how to do this ?

Another problem is, how can I know which process to be stopped (the update belongs to which process) ?

Thank you for any suggestion of doing this.