luaL_checkstring[-0, +0, v] const char *luaL_checkstring (lua_State *L, int arg); Checks whether the function argument arg is a string and returns this string. This function uses lua_tolstring to get its result, so all conversions and caveats of that function apply here.

luaL_checktype[-0, +0, v] void luaL_checktype (lua_State *L, int arg, int t); Checks whether the function argument arg has type t. See lua_type for the encoding of types for t.

luaL_checkudata[-0, +0, v] void *luaL_checkudata (lua_State *L, int arg, const char *tname); Checks whether the function argument arg is a userdata of the type tname (see luaL_newmetatable) and returns the userdata address (see lua_touserdata).

luaL_checkversion[-0, +0, v] void luaL_checkversion (lua_State *L); Checks whether the core running the call, the core that created the Lua state, and the code making the call are all using the same version of Lua. Also checks whether the core running the call and the core that created the Lua state are using the same address space.

luaL_dofile[-0, +?, e] int luaL_dofile (lua_State *L, const char *filename); Loads and runs the given file. It is defined as the following macro: (luaL_loadfile(L, filename) || lua_pcall(L, 0, LUA_MULTRET, 0)) It returns false if there are no errors or true in case of errors.

luaL_dostring[-0, +?, –] int luaL_dostring (lua_State *L, const char *str); Loads and runs the given string. It is defined as the following macro: (luaL_loadstring(L, str) || lua_pcall(L, 0, LUA_MULTRET, 0)) It returns false if there are no errors or true in case of errors.

luaL_error[-0, +0, v] int luaL_error (lua_State *L, const char *fmt, ...); Raises an error. The error message format is given by fmt plus any extra arguments, following the same rules of lua_pushfstring. It also adds at the beginning of the message the file name and the line number where the error occurred, if this information is available. This function never returns, but it is an idiom to use it in C functions as return luaL_error(args).

luaL_execresult[-0, +3, m] int luaL_execresult (lua_State *L, int stat); This function produces the return values for process-related functions in the standard library (os.execute and io.close).

luaL_fileresult[-0, +(1|3), m] int luaL_fileresult (lua_State *L, int stat, const char *fname); This function produces the return values for file-related functions in the standard library (io.open, os.rename, file:seek, etc.).

luaL_getmetafield[-0, +(0|1), m] int luaL_getmetafield (lua_State *L, int obj, const char *e); Pushes onto the stack the field e from the metatable of the object at index obj and returns the type of pushed value. If the object does not have a metatable, or if the metatable does not have this field, pushes nothing and returns LUA_TNIL.