简介

int main()
{
    int n = 0x00;
    int pid = fork();
    if (pid == -1)
        return -1;
        n = 10; //  修改两个进程共同都握有的一个页，此时将会触发cow
    if (pid)
    {
        printf("I am father, my pid is %d\n", getpid());
        return 0;
    }
    else
    {
        printf("I am child, my pid is %d\n", getpid());
        return 0;
    }
}

参考资料

Linux fork那些隐藏的开销