DS_NOERROR                                     =   0 , 
  DS_ERR_POSIX_FAILED_MAPPING_SHARED_MEMORY      =   1 , 
  DS_ERR_POSIX_FAILED_OPEN_SHARED_MEMORY         =   2 , 
  DS_ERR_POSIX_FAILED_MAKE_SHARED_MEMORY         =   3 , 
  DS_ERR_SYS5_FAILED_ATTACH_SHARED_MEMORY        =   4 , 
  DS_ERR_SYS5_FAILED_GET_SHARED_MEMORY           =   5 ,
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