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    int sigempty(sigset_t *set);                 // Çå¿ÕÐźż¯set
    int sigfillset(sigset_t *set);                   // ÌîÂúÐźż¯£¬¼´ÈÃset°üº¬ËùÓеÄÐźÅ
    int sigaddset(sigset_t *set, int signo);  // ÔÚsetÖÐÔö¼ÓsignoÐźÅ
    int sigdelset(sigset_t *set, int signo);   // ÔÚsetÖÐÈ¥µôsignoÐźÅ
    int sigismember(sigset_t *set, int signo); // ÐźÅsignoÊÇ·ñÔÚÐźż¯setÖÐ
    int sigprocmask(int how, const sigset_t set, sigset_t oset); // Èôoset·Ç¿Õ£¬Ôò½ø³ÌµÄµ±Ç°ÐÅºÅÆÁ±Î×Öͨ¹ýoset·µ»Ø£¬ÈôsetÊÇÒ»¸ö·Ç¿ÕÖ¸Õ룬×ŲÎÊýhowָʾÈçºÎÐ޸ĵ±Ç°ÐÅºÅµÄÆÁ±Î×Ö£¬how¿ÉÒÔÈ¡Èý¸öÖµ£º
    SIG_BLOCK£ºÔö¼ÓÒ»¸öÐźš£
    SIG_UNBLOCK£º½â³ýÒ»¸öÐźš£
    SIG_SETMASK£º¸Ã½ø³ÌµÄÐźŽ«±»setÐźż¯È¡´ú¡£
    int sigpengding(sigset_t *set);  // ¸Ãº¯Êý·µ»ØÐźż¯£¬¸ÃÐźÅͨ¹ýset²ÎÊý·µ»Ø¡£
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#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
static void sig_quit(int);
int
main(void)
{
sigset_t newmask, oldmask, pendingmask;
//ÉèÖöÔÐźÅSIGQUITµÄ´¦Àíº¯Êý
if (signal(SIGQUIT, sig_quit) == SIG_ERR)
{
fprintf(stderr, "can't catch SIGQUIT\n");
exit(1);


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