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？
--
---------------------------------
Zhenwen Xu - Open and Free
Home Page: http://zhwen.org
in fs/open.c
sys_open
| --> do_sys_open
|---> fd_install
Then fd is installed into file_fdtable
in fs/file_table.c
fget_light/fget
|----> fcheck_files
Then kernel get files from fd.
2009/11/20 Helight.Xu <[email protected]>:
> 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？
>
> --
> ---------------------------------
> Zhenwen Xu - Open and Free
> Home Page: http://zhwen.org
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to [email protected]
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> Please read the FAQ at http://www.tux.org/lkml/
>
Xiaotian Feng wrote:
> in fs/open.c
> sys_open
> | --> do_sys_open
> |---> fd_install
>
> Then fd is installed into file_fdtable
>
> in fs/file_table.c
> fget_light/fget
> |----> fcheck_files
>
> Then kernel get files from fd.
>
struct file is easy to get : current->files->fd_array[fd]
but I didn't find the file name!
> 2009/11/20 Helight.Xu <[email protected]>:
>
>> 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？
>>
>> --
>> ---------------------------------
>> Zhenwen Xu - Open and Free
>> Home Page: http://zhwen.org
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to [email protected]
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>> Please read the FAQ at http://www.tux.org/lkml/
>>
>>
>
>
--
---------------------------------
Zhenwen Xu - Open and Free
Home Page: http://zhwen.org
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
--
Live like a child, think like the god.
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，现在只
能找到文件名，还在找路径。。。
>
>
--
---------------------------------
Zhenwen Xu - Open and Free
Home Page: http://zhwen.org
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.
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 [email protected] since $subject
is in Chinese.
I guess Helight wanted to send to zh-kernel.org, right?
--
Live like a child, think like the god.
On Mon 2009-11-23 09:02:33, Helight.Xu wrote:
> Am??rico Wang wrote:
>> On Fri, Nov 20, 2009 at 02:33:48PM +0800, Helight.Xu wrote:
>>
>>> ???????????????????????????????????????????????????????????????????????????open??????fd
>>> ??????????????????????????????????????????????????????
>>>
>>>
>>
>> ?????????????????????????????????????????????????????????????????????????????????
>>
>> % readlink /proc/<PID>/fd/X
>>
> ????????????????????????????????????????????????????????????????????????????????????????????????????????????
> ?????????????????????????????????????????????
>>
>>
Could we keep the list english-only?
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Pavel Machek wrote:
> Could we keep the list english-only?
I thought that was the rule, but then concluded that there was probably
good reason for using Chinese--perhaps insufficient skill in
English--and why shouldn't people be allowed to post in a language they
understand? Certainly less people can answer in other languages, but as
we've seen, it's more than zero, and I gather a satisfactory result was
achieved. If you don't understand the language just skip the thread and
move on.
On Wed, Nov 25, 2009 at 12:40:05AM +1030, David Newall wrote:
> Pavel Machek wrote:
>> Could we keep the list english-only?
>
> I thought that was the rule, but then concluded that there was probably
> good reason for using Chinese--perhaps insufficient skill in
> English--and why shouldn't people be allowed to post in a language they
> understand? Certainly less people can answer in other languages, but as
> we've seen, it's more than zero, and I gather a satisfactory result was
> achieved. If you don't understand the language just skip the thread and
> move on.
Hi, sorry about this.
It was proved to be a mistake, I checked this with Helight, he wanted
to send to a Chinese lkml.
Don't worry, none of us has problems to write English emails. ;)
Thanks for your care.
--
Live like a child, think like the god.