Sinlge Instance of the Application

[Lalit Seth]

Hi,

I am having a C++ Application.

I wanted to make sure that its only one instance is active at a particular time.

Is there any System Call to do the same or other way to acheive the same?

Many Thanks

[Fred Ruffet]

I think it's your program that may look for this. When it starts, it should look for another instance. If one running, then exit immediately. That is done by many programs using lock files.
If you want a program to monitor, how would this one know which one to kill ? Or even if it is safe to kill ?

Regards,

Fred

[Steve Steel]

Hi


Simple solution most programs use is to make a file like
/tmp/applicationPID containing the process id of this application.

If file exists give a message and exit until either file is manually removed or other copy of application stops.

Steve Steel