Very Computer

Is there any way in C (using some system call or whatever) to determine how
many processes have a certain file open for writing/reading?  Or are there
any system calls that do anything related (similar) to that?

Thanks,
-Maran

 Maran> Is there any way in C (using some system call or whatever) to
 Maran> determine how many processes have a certain file open for
 Maran> writing/reading?  Or are there any system calls that do
 Maran> anything related (similar) to that?

This typically involves grovelling in kernel memory.

In 99.9% of cases, the answer is "you don't want to do that". Really.

(For the other cases, get hold of lsof, and invoke it from your
program via popen or similar, and remember that the information you
get is already out of date by the time you read it.)

--
Andrew.

comp.unix.programmer FAQ: see <URL: http://www.erlenstar.demon.co.uk/unix/>
                           or <URL: http://www.whitefang.com/unix/>

> Is there any way in C (using some system call or whatever) to determine how
> many processes have a certain file open for writing/reading?  Or are there
> any system calls that do anything related (similar) to that?