basic C module in Lua with Luarocks

main.lua

sleep = require ("sourcevault/sleep")

sleep.hello()

sleep.c

#include <lua.h>

int sleep_hello(lua_State* L) {

   lua_pushliteral(L, "Hello, world!");

   return 1;
}

int luaopen_sleep(lua_State* L) {

   lua_newtable(L);

   lua_pushcfunction(L, sleep_hello);

   lua_setfield(L, -2, "hello");

   return 1;
}

sleep.rockspec

package = "sourcevault/sleep"
version = "1.0-1"
source = {
   url = "." -- not online yet!
}
build = {
   type = "builtin",
   modules = {
      sourcevault =
      	{sleep = "sleep.c"}
   }
}