shmget: Permission Denied

[kardon33]

Hello Bytes,

Computer Type: Debian Lenny Linux x86

I am trying to use shmget to create a block of shared memory. I managed to get that working fine, I run the program always in root.

My problem though is when I want a user that is non-root to access the block I keep getting Permission Denied error.

I set the S_IWOTH so that other users can access the block it doesn't seem to be working.

Am I doing something wrong?

key = ftok("21312", 'R');
    if ((shmid = shmget(key, 1024,IPC_CREAT | S_IWOTH)) < 0) {
        perror("shmget");
        exit(1);
    }