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=== Assistant: 完全正确，哥们！printf 默认写入 stdout，而 dup2 已经把 stdout 指向了文件，所以输出自然就到了文件里。 === 完全正确，哥们！printf() 默认写入 stdout，而 dup2 已经把 stdout 指向了文件，所以输出自然就到了文件里。 接着想问你一个进程同步的问题： 假设父进程创建了一个子进程去写文件，父进程立即退出，会出现什么问题？用我们学的函数，怎么解决？
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