signal2.c

操作系统的一些实验

#include<unistd.h>
#include<signal.h>
#include<stdio.h>

int pid1,pid2;
int EndFlag =0;
int pf1 =0;
int pf2 =0;

void IntDelete()
{
    kill(pid1,16);
    kill(pid2,17);
    EndFlag=1;
}

void Int1()
{
    printf("child process 1 is killed by parent\n");
    exit(0);
}

void Int2()
{
    printf("child process 2 is killed by parent\n");
    exit(0);
}

int main()
{
    int exitpid;
    signal(SIGINT,SIG_IGN);
    signal(SIGQUIT,SIG_IGN);
    while((pid1=fork())==-1);
    if(pid1==0)
    {
        signal(SIGUSR1,Int1);
        signal(SIGINT,SIG_IGN);
        pause();
        exit(0);
    }
    else
    {
        while((pid2=fork())==-1);
        if(pid2==0)
        {
            signal(SIGUSR1,Int2);
            signal(SIGINT,SIG_IGN);
            pause();
            exit(0);
        }
        else
        {
            signal(SIGINT,IntDelete);
            waitpid(-1,&exitpid,0);
            printf("parent process is killed\n");
            exit(0);
        }
    }
}