linux-kernel - Re: 如何通过fd找到打开文件的路径及名称

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Message-ID: <20091123144152.GC2412@hack>
Date:	Mon, 23 Nov 2009 22:41:52 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	"Helight.Xu" <helight.xu@...il.com>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 如何通过fd找到打开文件的路径及名称

On Mon, Nov 23, 2009 at 09:02:33AM +0800, Helight.Xu wrote:
> Américo Wang wrote:
>> On Fri, Nov 20, 2009 at 02:33:48PM +0800, Helight.Xu wrote:
>>   
>>> 在用户程序中打开文件进行编辑，那在内核中如何能通过open后的fd
>>> 来找到相应打开文件的路径及其名字呢？
>>>
>>>     
>>
>> 问题是你为什么要在内核中做呢？在用户空间完全可以完成：
>>
>>  % readlink /proc/<PID>/fd/X
>>   
> 我是想在内核中实现一些功能，所以现在内核中找到文件的路径及其名称，


能在用户层完成的就不要跑到内核里去做，完全没必要。

而且，你在处理这个问题时还要考虑pipe和socket这些特殊的文件，
它们对应的fd可是没有file的。

> 现在只  
> 能找到文件名，还在找路径。。。

你可以看看proc文件中对fd/X的处理，或许能帮上忙。


-- 
Live like a child, think like the god.
 
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