#include<signal.h>
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<unistd.h>
void handler(int sig,siginfo_t*,void*){
        if(sig==SIGRTMIN){printf("Caught %d\n",sig);}
        else if(sig==SIGRTMIN+1){
        }
}
timer_t createTimer(int sig, double secs){
        sigevent sev;
        timer_t timerid;
        sev.sigev_notify=SIGEV_SIGNAL;
        sev.sigev_signo =sig;
        sev.sigev_value.sival_ptr=&timerid;
        if(timer_create(CLOCK_REALTIME,&sev,&timerid)==-1)return 0;
        
        long freq_nanosecs=(long)secs*1000000000;
        itimerspec its;
        its.it_value.tv_sec    =freq_nanosecs/1000000000;
        its.it_value.tv_nsec   =freq_nanosecs%1000000000;
        its.it_interval.tv_sec =its.it_value.tv_sec;
        its.it_interval.tv_nsec=its.it_value.tv_nsec;

        if(timer_settime(timerid,0,&its,NULL)==-1)return 0;
        return timerid;
}
int main(void){
        struct sigaction sa;
        sa.sa_flags=SA_SIGINFO;
        sa.sa_sigaction=handler;
        sigemptyset(&sa.sa_mask);
        if(sigaction(SIGRTMIN,&sa,NULL)==-1)return 1;

        createTimer(SIGRTMIN,2);
        createTimer(SIGRTMIN+1,5);
        int left=10;
        do{left=sleep(left);}while(left>0);
        return 0;
}