/* vim: set ts=4: *//* * Written by Der Herr Hofrat <der.herr@hofr.at> * Copyright Der Herr Hofrat  * Released under GPL V2 *//* * call a user-space allplication signal handler under control of an rt-clock  * source (periodic rt-thread actually).  */#include <stdio.h>#include <rtlinux_signal.h>#define PERIOD 50000 /* period in nanoseconds */void my_handler(int);struct rtlinux_sigaction sig, oldsig;long long rt_count=0;int main(void) {	int i=0;	sig.sa_handler = my_handler;	sig.sa_flags = RTLINUX_SA_PERIODIC;	sig.sa_period = PERIOD;	if(rtlinux_sigaction(RTLINUX_SIGTIMER0,&sig,&oldsig)) 	{		fprintf(stderr,"errore creating signal handler\n");		return -1;	}	/* keep the handler active for 10 seconds then reset it and exit 	 * note that the loop takes longer than one second as the loop 	 * time is sleep(1) + loop overhead - you actually can "measure" 	 * the loop overhead by running the same handler for 10 seconds	 * without the while loop and compare the number of timer-invocations	 */	while(i++<10){		sleep(1);		printf("periodic handler called %lld times\n",rt_count);	}//	sleep(10); /* instead of the while() loop above *///	printf("periodic handler called %lld times\n",rt_count);	/* reset the handler befor exiting */ 	sig.sa_handler = RTLINUX_SIG_IGN;	return 0;}void my_handler(int argument){	rt_count++;}