Re: Only allowing a file to be opened by one app
Re: Only allowing a file to be opened by one app
- Subject: Re: Only allowing a file to be opened by one app
- From: Michael Ash <email@hidden>
- Date: Wed, 1 Jul 2009 18:54:16 -0400
On Wed, Jul 1, 2009 at 11:47 AM, Andy Bettis<email@hidden> wrote:
> Hi,
>
> I'd like to set up my app so that if one user has a file open with it
> another user cannot open the file. This only needs to limit access by copies
> of my app, no need to block out any other process.
>
> In the past I'd just leave a write access path open when the file was opened
> from within my app - this would prevent anyone else from getting write
> access (and therefore opening the file) and has the bonus that if the app
> was closed down unexpectedly (these things happen) then the 'lock' was
> removed. This doesn't happen with default NSDocument based apps (like mine)
> - is there a way of doing it? Or a better way of setting exclusive access?
>
> Any help gratefully appreciated.
How about calling open() with the O_EXLOCK flag, or using the flock()
call on your document file?
Mike
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