Re: IPC_STAT on ia64

[n0ano@n0ano.com]

This is a little surprising.  In `arch/ia64/ia32/sys_ia32.c' there is a
routine `shmctl32' that is supposed to solve this problem.  It shouldn't
be too hard to find out where the bug is, there is an `IPC_STAT' case
that is supposed to deal with this.

On Tue, May 04, 2004 at 02:52:35PM +0530, ARADHYA, CHINMAYA TM (STSD) wrote:
> hello,
> 
> I noticed that when a 32bit application running on a ia64 system 
> makes a shmctl call  with IPC_STAT flag junk data will be filled 
> in the shmid_ds structure.
> This is on the kernel version - 2.4.18-e.12smp
> 
> Sample program to reproduce the problem:
> 
> #include <stdio.h>
> #include <errno.h>
> #include <sys/ipc.h>
> #include <sys/shm.h>
> #include <sys/types.h>
> #define errmsg(s,no) { printf("*** %s - %s ***\n",s,strerror(no)); 
> exit(1); }
> #define FTOK_FILENAME "/sbin"
> #define PRJ_NO 419
> int main()
> {
>         key_t shmkey;
>         int shmid;
>         char *shmt=NULL;
>         struct shmid_ds shdata;
>         if ((shmkey = ftok(FTOK_FILENAME,PRJ_NO)) = -1)
>                 errmsg("ftok error",errno);
>         if ((shmid = shmget(shmkey,1048700,IPC_CREAT|IPC_EXCL|0666)) 
> = -1)
>                 errmsg("shmget error",errno);
>         if((shmt=(char*)shmat(shmid,NULL,0)) = -1)
>                 errmsg("shmat error", errno);
>         if(shmctl(shmid,IPC_STAT,&shdata) = 0)
>         {
>                 printf("=Shared mem size=%d=\n",shdata.shm_segsz);
>         }
>         shmdt(shmt);
>         shmctl(shmid,IPC_RMID,0);
> }
>   
> Actual results:
> =Shared mem size=1073832704=
> Expected results:
> =Shared mem size=1048700=
> 
> 
> Could anybody tell me how to go about addressing this problem.
> 
> TIA
> Chinmaya 
>  
> -
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-- 
Don Dugger
"Censeo Toto nos in Kansa esse decisse." - D. Gale
n0ano@n0ano.com
Ph: 303/447-2201