How to prevent/detect running multiple instance of same application/dameon

[riteshtaksali]

hello

OS: CENTOS 5
How to detect/prevent running the multiple instance of same application, in c++ code.

My applicaion is written in c++. and compile using the g++ version 4.1.2.

Thanks in advance.
Ritesh

[wje_lf]

In your program, create a file in the /tmp directory. Use advisory locking to lock, say, the first byte in the file. If the lock succeeds, then the application should continue running. If it fails, then the application should exit.

For information on advisory locking, do this at the command line:

man fcntl

If man pages are not installed on your system, google this:

linux man fcntl

Hope this helps.