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  int sigemptyset(sigset_t *set);
  int sigfillset(sigset_t *set);
  int sigaddset(sigset_t *set,int signo);
  int sigdelset(sigset_t *set,int signo)
  int sigismember(const sigset_t *set,int signo);
  »¹ÓÐÒ»¸öÖØÒªµÄº¯Êý£ºint sigprocmask(int how,const sigset_t *restrict set,sigset_t *restrict oset);
  µ¥´¿½²ÕâЩº¯ÊýºÜÄѽ²Ã÷°×£¬ÏÂÃæ½áºÏ³ÌÐòÀ´½²£¬³ÌÐòÀ´×ÔUNIX»·¾³¸ß¼¶±à³Ì£º
  
   static void sig_quit(int);   //ÐźŴ¦Àíº¯Êý
   int main( )
  {
     sigset_t newmask,oldmask,pendmask;
     if(signal(SIGQUIT,sig_quit)==SIG_ERR)
            err_sys("can not catch SIGQUIT");
     -----------------------------------------------------------------------------------------------------------
     sigemptyset(&newmask);    //Çå¿ÕÐźÅÑÚÂ뼯newmask,²»×èÈûÈκÎÐźÅ
     sigaddset(&newmask,SIGQUIT);  //½«SIGQUITÐźŷÅÈëÐźż¯newmaskÖÐÈ¥
    
     if(sigprocmask(SIG_BLOCK,&newmask,&oldmask)<0) //½«oldmask ºÍnewmaskºÏ²¢
             err_sys("SIG_BLOCK error");  //µ±Ç°ÐÅºÅÆÁ±Î×Ö·ÅÔÚnewmaskÀÒÔǰµÄ·ÅÔÚoldmaskÀï
    
     sleep(5);
     if(sigpending(&pendmask)<0)   //±£´æËùÓб»×èÈûµÄÐźţ¬±¾Àý¼´±£´æSIGQUITµ½pendmaskÖÐÈ¥
            


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