从文件中获取文件名* [英] Getting a File Name from a FILE *
问题描述
我发现自己处于奇怪的情况，试图确定一个文件的名称
已经在其他地方通过fopen调用打开了，所以我只有
$ b来自该fopen电话的$ b FILE *。我仔细阅读了我最喜欢的在线C API参考
并没有找到方法，但希望这意味着我没有看到
正确的地方（我们都知道它有多容易一旦你知道
到实际看的东西就是找东西。
所以，给出一个文件*的问题可以回到这个名字/
文件的路径，如果是这样，怎么样？
感谢您的帮助，
Dale Pennington
I find myself in the odd situation of trying to determine the name of a file
that has been opened somewhere else with an fopen call, so all I have is the
FILE * from that fopen call. I perused my favorite online C API reference
and did not find a method, but hopefully that means I did not look in the
right places (we all know how easy it is to find stuff once you know where
to acutally look).
So, the question, given a FILE *, can one get back to the name/path of the
file that was opened, and if so, how ?
Thanks for the assist,
Dale Pennington
推荐答案
Dale Pennington写道：
Dale Pennington wrote:
所以，这个问题，给出一个文件* ，可以回到打开的
文件的名称/路径，如果是这样，怎么样？
So, the question, given a FILE *, can one get back to the name/path of the
file that was opened, and if so, how ?
No.
文件系统中可能有多个名称/路径引用
底层文件，或者根本没有，并且标准C中没有办法从一个FILE *转到一个零或多个文件名的列表，这些文件名对应于
it。
offtopic：根据你的平台和需求，如果你真的需要这样做，你可能会看一下像lsof这样的东西。不过，你真的是最好的消除这个需求。
No.
A FILE * may have many names/paths in the filesystem that refer to the
underlying file, or none at all, and there''s no way in standard C to go
from a FILE * to a list of zero or more filenames that correspond to
it.
offtopic: Depending on your platform and needs, you might look at
something like lsof if you really need to do this. You''re really best
off eliminating the need, though.
Dale Pennington在08/22/06 17:14写道：
Dale Pennington wrote On 08/22/06 17:14,:
我发现自己处于尝试确定文件名称的奇怪情况/>
已经通过fopen调用在其他地方打开了，所以我所拥有的就是来自该fopen调用的
FILE *。我仔细阅读了我最喜欢的在线C API参考
并没有找到方法，但希望这意味着我没有看到
正确的地方（我们都知道它有多容易一旦你知道
到实际看的东西就是找东西。
所以，给出一个文件*的问题可以回到这个名字/
打开的
文件的路径，如果是这样，怎么样？
I find myself in the odd situation of trying to determine the name of a file
that has been opened somewhere else with an fopen call, so all I have is the
FILE * from that fopen call. I perused my favorite online C API reference
and did not find a method, but hopefully that means I did not look in the
right places (we all know how easy it is to find stuff once you know where
to acutally look).
So, the question, given a FILE *, can one get back to the name/path of the
file that was opened, and if so, how ?
这是comp.lang.c中的问题19.15。经常
问题（FAQ）列表
http://www.c-faq.com/
....你不会喜欢这个答案。 ： - （
-
Er ***** ****@sun.com
This is Question 19.15 in the comp.lang.c Frequently
Asked Questions (FAQ) list
http://www.c-faq.com/
.... and you''re not going to like the answer. :-(
--
Er*********@sun.com
" Dale Pennington" da *********** **** @ boeing.com写道：
"Dale Pennington" <da***************@boeing.comwrites:
所以，给定一个FILE *的问题，可以回到
的名称/路径
文件已打开，如果是，如何？
So, the question, given a FILE *, can one get back to the name/path of the
file that was opened, and if so, how ?
这是一个常见问题。
19.15：如何在给定开放流或文件的情况下恢复文件名
描述符？
答：这个问题通常是不可解决的。在Unix下，对于
实例，扫描整个磁盘（可能涉及特殊的
权限）理论上是必需的，如果
描述符是连接到一个管道或引用一个已删除的
文件（并且可能会给一个带有
多个链接的文件带来误导性答案。）最好记住文件的名称
和你一样打开它们（可能带有包装函数
围绕fopen（））。
-
只是另一个C黑客。
This is a FAQ.
19.15: How can I recover the file name given an open stream or file
descriptor?
A: This problem is, in general, insoluble. Under Unix, for
instance, a scan of the entire disk (perhaps involving special
permissions) would theoretically be required, and would fail if
the descriptor were connected to a pipe or referred to a deleted
file (and could give a misleading answer for a file with
multiple links). It is best to remember the names of files
yourself as you open them (perhaps with a wrapper function
around fopen()).
--
Just another C hacker.
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