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Posted by Curt Zirzow on 11/16/05 05:41
On Wed, Nov 16, 2005 at 03:33:22AM +0530, Yaswanth Narvaneni wrote:
> Hi!
>
> I have a server written in C++ and my webpages are in PHP. The PHP has
> to communicate with the server using shared memory. This was working
> fine on the server running FC-1 with php-4.3.8. We recently migrated
> to CentOS 4.1 (Equivalent to RHEL 4.1) running php-4.3.9. The error it
> displays is as follows:
>
> shmop_open(): unable to attach or create shared memory segment in
> /var/www/html/sharedmem.php on line 2
>
> The server opens the shm in 666 (originally was 644) even then it was
> not working. I can see the shared mem open using 'ipcs' command.
>
> ...
> $shm_id = shmop_open($shm_key, "a",0,0) or die("FATAL ERROR:: Unable
> to Access Shared Memory");
You might want to try to open it within the same mode that the
server created it in:
1)
$shm_id = shmop_open($shm_key, "a",0666,0);
2)
are you 100% sure the key is valid? the error message you are
getting seems to point in this direction since the shmop_open is
failing on the C call to shmget(), wich usually fails when either
you dont have enough memory to create it (which you arn't doing),
some other creation problems, or that the key supplied wasn't
found.
Curt.
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