How to get filename of an open file descriptor

[Robert Watson]

On Mon, 12 Nov 2007, Yuri wrote:

> Thank you for your response.
>
> I attempted to compile procstat but procstat.h seems to be missing in tgz.

Yuri,

Indeed -- looks like I forgot to p4 add on my development box.  I've updated 
the tarball to now include procstat.h.  If there are any other problems, do 
let me know.

Robert N M Watson
Computer Laboratory
University of Cambridge

>
> Yuri
>
> Quoting Robert Watson <rwatson at FreeBSD.org>:
>
>> On Mon, 12 Nov 2007, Yuri wrote:
>>
>>> I am looking for functionality similar to Linux's /proc/<PID>/fd/<FD>. I
>>> need to know what is the file name of an open file descriptor.
>>>
>>> /proc/<PID>/fd is missing on FreeBSD.
>>>
>>> There's something called 'fdescfs'. In /dev/fd/ it shows the list of file
>>
>>> descriptors. But they don't seem to be symbolic links to open files. And
>>> also it only shows FDs of the current process.
>>>
>>> So why there's no /proc/<PID>/fd in FreeBSD? And how do I work around this?
>>
>>> Or should I just invest time and write a kernel patch implementing
>>> /proc/<PID>/fd/?
>>
>> You can give these patches a try:
>>
>>    http://www.watson.org/~robert/freebsd/20071112-procstat.tgz
>>
>> They reflect a work-in-progress procstat(1) tool, which inspects process
>> state
>> in various ways.  They are developed against 8-CURRENT, but likely still
>> apply
>> fairly easily to 7-STABLE.  They suffer various deficiencies, such as relying
>>
>> on the name cache in-kernel to generate file paths for mapped files and open
>>
>> file descriptors, so don't currently work with devfs nodes (for example).
>> However, they may do what you need.  Any feedback would be most welcome.
>>
>> Robert N M Watson
>> Computer Laboratory
>> University of Cambridge
>>
>
>
> -- 
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