lua_tonumberx[-0, +0, –] lua_Number lua_tonumberx (lua_State *L, int index, int *isnum); Converts the Lua

lua_status[-0, +0, –] int lua_status (lua_State *L); Returns the status of the thread L.

lua_load[-0, +1, –] int lua_load (lua_State *L, lua_Reader reader, void *data,

utf8.char (···)

debug.getmetatable (value) Returns the metatable of the given value or nil if it does not have a metatable.

lua_rotate[-0, +0, –] void lua_rotate (lua_State *L, int idx, int n); Rotates the stack elements between

luaL_optstring[-0, +0, v] const char *luaL_optstring (lua_State *L, int arg

lua_isuserdata[-0, +0, –] int lua_isuserdata (lua_State *L, int index); Returns 1 if the value at the given

io.popen (prog [, mode]) This function is system dependent and is not available on all platforms. Starts program prog in a separated process and returns

io.read (···) Equivalent to io.input():read(···).