RB_RDONLY
od->boothowto = (RB_RDONLY);
od->boothowto = (RB_RDONLY|RB_SINGLE);
boothowto |= RB_RDONLY;
boothowto |= RB_RDONLY;
{"boot_rdonly", RB_RDONLY},
{"boot_rdonly", RB_RDONLY},
lua_pushinteger(L, RB_RDONLY);