Program terminates if I use scanf

I am trying to implement the timer in code, All the example that I found are using while(1) or for(;;) but when I tried with using scanf my program terminates. Is it getting any value on stdin because if I use scanf two times then timer is called two time before exiting from program.
Here is my sample code:

#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <signal.h>
 #include <netinet/in.h>
 #include <signal.h>
 #include <time.h>
 
 #include <linux/socket.h>
 #include <time.h>
 
 
 #define SIGTIMER (SIGRTMAX)
 #define SIG SIGUSR1
 static timer_t     tid;
 static timer_t     tid2;
 
 void SignalHandler(int, siginfo_t*, void* );
 timer_t SetTimer(int, int);
 
 int main(int argc, char *argv[]) {
 
     int t;
 
     printf("SIGRTMAX %d\n", SIGRTMAX);
         printf("SIGRTMIN %d\n", SIGRTMIN);
 
     struct sigaction sigact;
     sigemptyset(&sigact.sa_mask);
     sigact.sa_flags = SA_SIGINFO;
     sigact.sa_sigaction = SignalHandler;
     // set up sigaction to catch signal
     if (sigaction(SIGTIMER, &sigact, NULL) == -1) {
         perror("sigaction failed");
         exit( EXIT_FAILURE );
     }
 
     // Establish a handler to catch CTRL+c and use it for exiting.
     sigaction(SIGINT, &sigact, NULL);
     tid=SetTimer(SIGTIMER, 1000);
 
     struct sigaction sa;
     sigemptyset(&sa.sa_mask);
     sa.sa_flags = SA_SIGINFO;
     sa.sa_sigaction = SignalHandler;
     // set up sigaction to catch signal
     if (sigaction(SIG, &sa, NULL) == -1) {
         perror("sa failed");
         exit( EXIT_FAILURE );
     }
 
     // Establish a handler to catch CTRL+c and use it for exiting.
     sigaction(SIGINT, &sa, NULL);
     tid2=SetTimer(SIG, 1000);
 
    // for(;;);  or while(1) Working properly
 
     scanf("%d", &t); /// Program terminates
     return 0;
 }
 
 void SignalHandler(int signo, siginfo_t* info, void* context)
 {
 
 
     if (signo == SIGTIMER) {
         printf("Command Caller has ticked\n");
 
     }else if (signo == SIG) {
         printf("Data Caller has ticked\n");
 
     } else if (signo == SIGINT) {
         timer_delete(tid);
         perror("Crtl+c cached!");
         exit(1);  // exit if CRTL/C is issued
     }
 }
 timer_t SetTimer(int signo, int sec)
 {
     static struct sigevent sigev;
     static timer_t tid;
     static struct itimerspec itval;
     static struct itimerspec oitval;
 
     // Create the POSIX timer to generate signo
     sigev.sigev_notify = SIGEV_SIGNAL;
     sigev.sigev_signo = signo;
     sigev.sigev_value.sival_ptr = &tid;
 
     if (timer_create(CLOCK_REALTIME, &sigev, &tid) == 0)
     {
 
         itval.it_value.tv_sec = sec / 1000;
         itval.it_value.tv_nsec = (long)(sec % 1000) * (1000000L);
         itval.it_interval.tv_sec = itval.it_value.tv_sec;
         itval.it_interval.tv_nsec = itval.it_value.tv_nsec;
 
 
 
         if (timer_settime(tid, 0, &itval, &oitval) != 0)
         {
             perror("time_settime error!");
         }
     }
     else
     {
         perror("timer_create error!");
         return NULL;
     }
     return tid;
 }
 

So, How can I resolve this problem ?
Any help would be Appreciated.
Thanks, Yuvi

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