test10_6.txt

Linux下的C语言编程

#include <signal.h>
#include "ourhdr.h"
volatile sig_atomic_t quitflag;
int main(void)
{
    	void  sig_int(int);
    	sigset_t newmask, oldmask, zeromask;

    	if(signal(SIGINT,sig_int)==SIG_ERR)
        	err_sys("signal (SIGINT) error"); 
    	if(signal(SIGQUIT,sig_int)==SIG_ERR)
        	err_sys("signal (SIGQUIT) error");

    	sigemptyset(&zeromask);
    	sigemptyset(&newmask);
    
	sigaddset(&newmask, SIGQUIT);
	if(sigprocmask(SIG_BLOCK,&newmask,&oldmask)<0)
       		err_sys("SIG_BLOCK error");

	while(quitflag==0)
	sigsuspend(&zeromask);
    
    	quitflag=0;
    	if(sigprocmask(SIG_SETMASK,&oldmask,NULL)<0)
        	exit(0);
}


void sig_int(int signumber)
{
    	if(signumber==SIGINT)
        	printf("\nintetrreupt\n");
    	else if(signumber==SIGQUIT)
        	quitflag=1;
    	return;
}