On Wednesday 14 June 2006 11:13, Burkhard Carstens wrote:
> Am Mittwoch, 14. Juni 2006 18:39 schrieb Vincent Snijders:
> > Bogusław Brandys wrote:
> > > Michael Van Canneyt wrote:
> > >> On Wed, 14 Jun 2006, Andreas Berger wrote:
> > >>> Does Lazarus have a cross-platform way of guaranteeing that only
> > >>> one instance of the program can run? I know how to do this in
> > >>> windows but would like to use a cross-platform approach for my
> > >>> Lazarus apps. It would also be nice (but not necessary) if I
> > >>> could receive a handle or other access method of the first
> > >>> running instance.
> > >>
> > >> You can do the same as on Windows, only the actual calls will
> > >> differ.
> > >>
> > >> It would be nice to wrap these calls in a component...
> > >>
> > >> Michael.
> > >
> > > Good news is that in Turbo Power OnGuard component that I'm porting
> > > to fpc/lazarus there is a unit for this.However under linux there
> > > is no certain way to do it.It is done by using defined filename but
> > > unfortunately there is no way to automatically delete this file on
> > > crash.When application crashes this file must be removed manually
> > >
> > > :-( I have found also situation when mutex used under windows is
> > >
> > > not released when application hang (this is however rare)
> >
> > I am not very proficient in *nix, but maybe you can create a lock
> > file with the Process ID (PID) in it. After seeing that there is a
> > lock file, you can ask the system if the a process with that PID
> > exists. Of course PIDs are recycled after a process is closed to
> > theoretically you have a (small) chance that the system says the PID
> > is in use. Maybe you can get some extra information of the process by
> > the PID, i.e. command line or executable, like the info you see in
> > top and or ps. With that info you could make the lock per user or per
> > system.
> >
> > Vincent.
>
> e.g. cat /proc/$PID/cmdline
>
> Burkhard
What does that string do. On SUSE 10.0 it reports very little.
root=/dev/hda2 vga=0x317 selinux=0 resume=/dev/hda1 splash=silent
John
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