#include <stdio.h>#include <unistd.h>#include <signal.h>void sigusr1(int sig){	printf("got the SIGUSR1 signal...\n");	exit(0);}int main(void){	if(signal(SIGINT,SIG_IGN)==SIG_ERR){		perror("cannot reset the SIGINT signal handler");		return 1;		}	if(signal(SIGUSR1,sigusr1)==SIG_ERR){		perror("cannot reset the SIGUSR1 signal handler");		return 1;	}	pause();	return 0;}