Re: Availability of netshm/POSIX shared memory under Ubuntu 9.10

2010/3/15 Gerd Stolpmann <[email protected]>

> On Mo, 2010-03-15 at 18:33 +0100, Johan Mazel wrote:
> > Hi
> > I'm trying to use ocamlnet to access to POSIX shared memory.
> >
> > I wrote this little piece of code:
> >
> > let _ =
> >     Printf.printf("Test shared memory\n");
> >     if (Netsys.have_posix_shm () = false) then
> >         Printf.printf("No POSIX SHM\n")
> >     else
> >         (
> >             Printf.printf("POSIX SHM OK\n");
> >         )
> >
> > It is displaying me "No POSIX SHM".
> >
> > I also tried to run some code like :
> >     let my_shm_name = `POSIX "my_shm" in
> >     let sd = Netshm.open_shm my_shm_name [Unix.O_CREAT; Unix.O_RDWR]
> > 0o666 in
> >
> > The result is an error:
> > Fatal error: exception Invalid_argument("Netsys.shm_open not
> > available")
> >
> > I am running this code on a Ubuntu 9.10 64 bits.
> > This page
> > "http://manpages.ubuntu.com/manpages/karmic/man7/shm_overview.7.html"
> > specifies that "POSIX shared memory is supported since Linux 2.4 and
> > glibc 2.2."
> > I do not see any reason why I obtain this behaviour.
> >
> > Thanks in advance for your time.
> > Regards.
> > Johan Mazel
>
> Where did you get your ocamlnet package from? Apparently, this is a
> configuration issue. I'm developing on Ubuntu 9.10 and posix shm is
> definitely there. Problems can arise when headers were missing at build
> time.
>
> Gerd
>

Hi
I got the packages from the default Ubuntu repositories.
Is there any way to check their correctness ?
I added some custom repositories to access the updates of a couple of
software not included in the official repositories.
Johan Mazel

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