From: Charles Mills <cmills@...>
Date: 2004-08-25T06:17:30+09:00
Subject: Re: Find the number of open files

On Aug 24, 2004, at 1:45 PM, Ara.T.Howard@noaa.gov wrote:

> On Wed, 25 Aug 2004, Charles Mills wrote:
>
>> On Aug 24, 2004, at 12:41 PM, Charles Mills wrote:
>>
>>> Is there an easy way to find out the number of open files held by a
>>> process (using C or Ruby)?
>>>
>> I think the way I phrased the question above makes the problem sound
>> harder than it is...
>> I am unittesting a C extension.  The extension opens files using
>> open().  I want to make sure that the extension closes all the files 
>> it
>> opens (when errors occur or whatever).
>>
>> So I figured getting a count of open file descriptors before the
>> extension code is called and after it is finished would enable me to 
>> do
>> this.
>
> define an xopen that updates a static var - then you won't have to 
> worry about
> some other process/thread/function opening up files and killing your 
> test...
>
> cheerx.
>
> -a

Yeah, if your curious that is what I am doing.  The library that I am 
testing already uses functions that wrap open() and close().  So I am 
adding a global structure to that module to keeps track of the fd's in 
use.  Should be a much more robust test - keeping track of which fd's 
are created using xopen and which are closed using xclose .... should 
be 1 to 1.
Thanks for all the help,
Charlie