Prevent a process from opening a file more than once

Mulyadi Santosa mulyadi.santosa at
Tue Sep 27 20:35:01 EDT 2011

On Wed, Sep 28, 2011 at 07:30, Venkatram Tummala <venkatram867 at> wrote:
> On Tue, Sep 27, 2011 at 5:22 PM, Mulyadi Santosa <mulyadi.santosa at>
> wrote:
>> Hi :)
>> On Wed, Sep 28, 2011 at 06:56, Venkatram Tummala <venkatram867 at>
>> wrote:
>> > Hi All,
>> > I have a simple device driver which creates a /dev/XYZ file. I need to
>> > prevent a process from opening the file more than once. However,
>> > multiple
>> > processes can open the file simultaneously. Is there any any elegant way
>> > to
>> > do this other than checking all opened files in the process ?
>> Uhm, keep a reference count and increment it on every file open in
>> your module? How does that sound?
> Well, which refcount should i use? I can't use the refcount in the file
> object as the file objects passed to me are different each time the file is
> opened in the process.

Sorry, I mean something that traps everytime that file is opened and
increase a count. Thinking a while, inotify might do the job perfectly


Mulyadi Santosa
Freelance Linux trainer and consultant


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