Re: C calls Lua or Lua calls C?

File ../src/hello.lua:
----------------
hellolib.hello()


File src/hello.c:
-----------------
#include <stdio.h>
#include "lauxlib.h"

static int hello(lua_State *L) {
printf("Hello World!\n");
return 1;
}

static const struct luaL_Reg hellolib [] = {
{ "hello", hello }, /* registering the function */
{ NULL, NULL }
};

LUALIB_API int luaopen_hellolib (lua_State *L) {
luaL_register(L, "hellolib", hellolib); /* registering the module */
return 1;
}


File src/hello.h:
-----------------
#include "lua.h"

#define HELLO_LIBNAME "hellolib"
LUALIB_API int (luaopen_hellolib) (lua_State *L);


Extend file src/linit.c:
------------------------
...
#include "lauxlib.h"
#include "hello.h" /* add */
...
static const luaL_Reg lualibs[] = {
...
{"hellolib", luaopen_hellolib}, /* add */
{NULL, NULL}
...


Extend src/Makefile:
--------------------
...
LIB_O= lauxlib.o lbaselib.o ldblib.o liolib.o lmathlib.o loslib.o ltablib.o \
lstrlib.o loadlib.o linit.o hello.o # add
...
hello.o: hello.c # add

# (end of Makefile)


Build & Run
-----------
Build Lua from ../src/ folder, e.g. sudo make

Run src/lua hello.lua