C - setitimer
=============
    
Public Domain
********************************************************************************
### setitimer : set interval timer
    
    
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <signal.h>
    #include <sys/time.h>
    
    double count;
    
    void catcher(int signum)
    {
        static i = 1;
        if (signum == SIGALRM) {
                printf(" i = %05d , count = %.0f \n", i++, count);
                return;
        } else if (signum == SIGINT) {
                printf("\n SIGINT \n");
                exit(EXIT_SUCCESS);
        }
    }
    
    int main()
    {
        struct itimerval tval;
        struct sigaction act;
    
        /* Catching SIGALRM and SIGINT */
        memset(&act, 0, sizeof(act));
        act.sa_handler = &catcher;
        sigaction(SIGALRM, &act, NULL);
        sigaction(SIGINT, &act, NULL);
    
        /* Timer kicks in after one microsecond */
        tval.it_value.tv_sec = 0;
        tval.it_value.tv_usec = 1;
        /* Timer fires every  three seconds */
        tval.it_interval.tv_sec = 3;
        tval.it_interval.tv_usec = 0;
        /* Starting a timer to send the SIGALRM signal */
        setitimer(ITIMER_REAL, &tval, NULL);
    
        /* Infinite addition */
        for (count = 0; ;count++);
    
        return 0;
    }
    
********************************************************************************
_BY: Pejman Moghadam_  
_TAG: c, setitimer, signal_  
_DATE: 2014-01-19 01:39:14_