C ++中的tail -f实现 [英] tail -f implementation in C ++

问题描述

采访中有人问我这个问题.如何在C或C ++中实现等效于Unix命令tail -f的功能.有人可以指教吗.

我认为我们应该使用ftell，fseek，但不是很确定.

谢谢，
Ganesh

Hi,
I was asked this question in an interview. How to implement the equivalent of Unix command tail -f in C or C++. Can someone please advise.

I think we should use ftell, fseek, but not quite sure though.

Thanks,
Ganesh

推荐答案

为什么不只是阅读tail的源代码或尝试实现它? :)

why not just read tail''s source code or try to implement it? :)

我将使用getline函数并进行递归.

I would use the getline function and recursion.

我认为当被问到这样的问题时，文件更改通知是关键.不是读取文件的方式，因为每个人都知道如何读取文件.

FindFirstChangeNotification()在Windows上可以使用WaitForXxxObject()，然后再使用WaitForXxxObject()可以避免使用计时器.

可能不需要在采访中知道这些函数的名称，但是了解它们并描述该技术更有价值.

I think the file change notification is the key when asked a question like that. Not how you read a file, because everyone knows how to read a file.

FindFirstChangeNotification() would work on windows followed by a WaitForXxxObject()to avoid having a timer.

Knowing the names of the functions is probably not necessary at an interview, but knowing about them and describing the technique is more valuable.

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