[LIP] check instance of a running application

Hi all,

     In Linux , Thr Coding in c how can i check
whether my application is running or not . i.e i have
written a small c program which will run as a
daemon.When i run the same program  again it should
check whether previous  instance  is running or
not(preferbly with the application name)  , if running
then i have to pass a value to the running application
.

For checking whether app is still running , I tried by
 writing the  PID value to a file and later checked
whether it exists or not. is there any other way to do
this....

Any solution !.


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