Linux
I cannot give advice about your program written in c, but once you have got it working, I believe you need to write a shellscript with functions like start, stop and restart which call your program with the correct parameters expected by your program. These scripts are stored in /etc/rc.d/init.d. Have a look at them and you will find some you can base your script on.
For each runlevel, 0 to 6, go to the corresponding directory rc0.d - rc6.d and create a link pointing to your script in init.d. Look at the naming standard in the directory and the sequence in which you want to start or stop your script in relation to other services in the system
Study the script /etc/rc.d/rc to see how it controls the runlevel changes, first running all the KILL scripts K00... - K99... and then all the START scripts S00... - S99...
However, if you want to run your program just once, the best place to launch it is from /etc/rc.d/rc.local.
by nico baggus
You can also enter it into the inittab just like
the getty tools allready there.
Or as a runonce entry if restart is not needed.
man inittab should provide more info there.
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