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Posted by Yaswanth Narvaneni on 11/16/05 11:50
Hi Curt,
These are my open shared memories in the server output of ipcs command.
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00000000 18645001 gOLeM 600 393216 2 dest
0x0000162e 18808842 root 666 30 1
The last one the the sharedmem the php will be using. the key is 5678
and as you said I
have modified my code to
$shm_id = shmop_open(intval($shm_key), "a",666,0) or die("FATAL
ERROR:: $php_errormsg");
U obtain the shm_key from a file. The key I am using is 5678 and it is
getting that value from the file. I even hardcoded the value, but the
error is not getting solved.
Is this a proble with any of the server configs? Coz we have
downloaded an example C file and this is also not working with the
PHP. Where as if the server and client both written in C are able to
communicate using the shared memory. Any clue any one??
Ok...just a crazy query...does it have anything to do with
Notice: import_request_variables(): No prefix specified - possible
security hazard in
which occurs due to register_globals set to Off??
On 11/16/05, Curt Zirzow <czirzow@gmail.com> wrote:
> 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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>
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>
--
"In theory there is no difference between theory and practice.
In practice there is." -- Fortune Cookie
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