setitimer.c

关于进程间通信的代码集锦2

#include <signal.h>
#include <unistd.h>
#include <sys/time.h>

void user_func(int sig)
{
	if(sig==SIGALRM)
	{
		printf("catch a signal SIGALRM\n");
	}
	else if(sig==SIGVTALRM)
	{
		printf("catch a signal SIGVTALRM\n");
	}	
}
int main()
{
	struct itimerval value,ovalue,value2;
	printf("Process id is = %d\n",getpid());	
	signal(SIGALRM,user_func);	
	signal(SIGVTALRM,user_func);
	
	value.it_value.tv_sec=1;
	value.it_value.tv_usec=0;
	value.it_interval.tv_sec=1;
	value.it_interval.tv_usec=0;
	setitimer(ITIMER_REAL,&value,&ovalue);


	value2.it_value.tv_sec=1;
	value2.it_value.tv_usec=500000;
	value2.it_interval.tv_sec=1;
	value2.it_interval.tv_usec=500000;
	
	setitimer(ITIMER_VIRTUAL,&value,&ovalue);

	while(1);	

	return 0;
}