[SOLVED] How to get file name from file descriptor?

user4321 · 10-06-2011, 07:20 PM

Hello,

I want to get the file name from file descriptor of an opened file.

Can anyone help me how to get file name from file descriptor?

Thanks

harry edwards · 10-07-2011, 11:57 AM

Does this help? http://stackoverflow.com/questions/1...escriptor-in-c

user4321 · 10-07-2011, 12:40 PM

I had gone through this link.
fstat doesnt give filename information and i cannot use readlink because of kernel.

Thanks for the reply.

harry edwards · 10-08-2011, 03:09 AM

My other thought was that the command lsof lists open files; including the FD and the file-name. I am not sure how; but, the source code is available at http://freshmeat.net/projects/lsof/. In theory lsof is doing exactly what you need; however, whether the code can be extracted and included in kernel module, I have no clue :-)

unSpawn · 10-08-2011, 05:05 AM

Quote:

Originally Posted by user4321

I am writing Loadable Kernel Module in which i write my own function to read a file and at the end i call the original read function.

What Linux distribution you use and what the purpose is does not matter as long as the file you're reading from or writing to resides in proc VFS. AFAIK Linux LKMs shouldn't read from or write to userland and if you want or think otherwise then that's a potentially lethal design mistake.