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  SYSTEM CALL: shmctl();
  PROTOTYPE: int shmctl ( int shmqid, int cmd, struct shmid_ds *buf );
    RETURNS: 0 on success
             -1 on error: errno = EACCES (No read permission and cmd is IPC_STAT)
                                  EFAULT (Address pointed to by buf is invalid with IPC_SET and
                                          IPC_STAT commands)
                                  EIDRM  (Segment was removed during retrieval)
                                  EINVAL (shmqid invalid)
                                  EPERM  (IPC_SET or IPC_RMID command was issued, but
                                          calling process does not have write (alter)
                                          access to the segment)
      NOTES:
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LAST UPDATE Nov 28,1997
Created Nov 28,1997