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Tuesday, June 22, 2010

How to write program to run Only one executable in Unix

The following program to make sure that we are running only one instance of a program in Unix :-) 

The concept is based on the named key Creation when creating any IPC mechanism.

int main()
sem_t *mysem;
mysem = sem_open("MyUniqueName", O_CREAT|O_EXCL);
if ( mysem == NULL )
fprintf(stderr, "I am already running!\n");

/* the app code here*/

/* end of the app */


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