#include <stdio.h>#include <signal.h>#include <sys/types.h>#include <unistd.h>int receivd_signal=0;void catch_ctrl_c(int signo){	printf("signo=%d\n",signo);	receivd_signal=1;}main(){	sigset_t newmask;	struct sigaction action;	action.sa_handler=catch_ctrl_c;	action.sa_flags=0;	if(sigaction(SIGINT,&action,NULL)==-1)		perror("can not SIGINT");	sigprocmask(SIG_SETMASK,NULL,&newmask);	sigaddset(&newmask,SIGINT);	sigprocmask(SIG_BLOCK,&newmask,NULL);	sigdelset(&newmask,SIGINT);	//while(receivd_signal==0)		sigsuspend(&newmask);	printf("dddddddd\n");}