如何通过fd找到打开文件的路径及名称
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From: Américo Wang on 23 Nov 2009 09:50 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Américo Wang on 23 Nov 2009 10:40
On Mon, Nov 23, 2009 at 04:05:55PM +0100, Jiri Kosina wrote: <snip> >Come on guys, you keep CCing LKML with this :) > Wow, I missed the "lkml" label on this email in my inbox... :-/ I thought it was from linux-kernel(a)zh-kernel.org since $subject is in Chinese. I guess Helight wanted to send to zh-kernel.org, right? -- Live like a child, think like the god. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |