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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);
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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°ÐźÅÆÁ±Î×Ö·ÅÔÚnewmaskÀÒÔÇ°µÄ·ÅÔÚoldmaskÀï
sleep(5);
if(sigpending(&pendmask)<0) //±£´æËùÓб»×èÈûµÄÐźţ¬±¾Àý¼´±£´æSIGQUITµ½pendmaskÖÐÈ¥
 
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