lua_setglobal
lua_setglobal(L, modname); /* _G[modname] = module */
lua_setglobal(L, "unpack");
LUA_API void (lua_setglobal) (lua_State *L, const char *var);
#define lua_register(L,n,f) (lua_pushcfunction(L, (f)), lua_setglobal(L, (n)))
lua_setglobal(state, LUA_COLIBNAME);
lua_setglobal(state, LUA_STRLIBNAME);
lua_setglobal(state, LUA_TABLIBNAME);
lua_setglobal(state, "zfs");
lua_setglobal(state, global->zeg_name);