Re: [gtk-list] Re: Detecting multiple application instances

["Siva Rama Krishna Rao J. Y." <siva speech iitm ernet in>]

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On Thu, 19 Aug 1999, Andrew Wood wrote:

> My first thought was to use IPC - isn't there some way of testing to see if
> another program already holds a particular resource? Don't know enough about
> IPC to be sure (never used it myself) but presumably it would mean that you
> could open the same application on 2 machines sharing the same home
> directory, which Netscape would (I imagine) break on due to the file already
> existing.
> 
> Looking at the ipc(5) man page it looks like IPC_CREAT | IPC_EXCL could be
> used as a sort of machine-specific "lock file". You could also use IPC to
> cause the second, unwanted, process to message the first and tell it to open
> a new window.
> 
> Just my 2p. ;)
> 
> - Andrew
> 
> 
> On Thu, 19 Aug 1999, Daniel Solaz wrote:
> 
> > Use a lock file somewhere in the users home directory.  Put the PID
> > inside so other instances can check with kill() whether the lock is held
> > by an existing process or has been left behind.  Check the lock at the
> > beginning of your program: open() can be used to atomically
> > test-or-create the lock file.  Destroy the lock you hold at exit.
> > This is what netscape's communicator does.  I've done it in some
> > programs and works fine.  I can email some code if you want.
> > -Daniel
> 
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