sigset_you_cant_stop.c

/*************************************************************************
    > File Name: sigset_1.c
    > Author: VOID_133
    > ################### 
    > Mail: ################### 
    > Created Time: Thu 26 May 2016 07:32:22 AM CST
 ************************************************************************/
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<signal.h>

void printsigset(const sigset_t *p)
{
    int i = 0;
    for(i = 1; i < 32; i++)
    {
        if(sigismember(p, i) == 1)
            putchar('1');
        else
            putchar('0');
    }
    puts("");
}

int main(void)
{
    printf("This program will run forever, you cannot stop it\n");
    printf("If you are sure to run it, press enter, else Ctrl + C NOW");
    getchar();
    sigset_t set, p;
    //Init the signal
    sigfillset(&set);
    //Add signals
    alarm(5);
    sigprocmask(SIG_BLOCK, &set, NULL);
    while(1)
    {
        sigpending(&p);
        printsigset(&p);
        sleep(1);
    }
}