#ifndef _POSIX_C_SOURCE

#define _POSIX_C_SOURCE 200809L

#endif

#include <time.h>

#include <lua.h>

static lua_Number tv2number(struct timespec *tv) {

	return tv->tv_sec + tv->tv_nsec * 1e-9;

}

static int lc_time_realtime(lua_State *L) {

	struct timespec t;

	clock_gettime(CLOCK_REALTIME, &t);

	lua_pushnumber(L, tv2number(&t));

	return 1;

}

static int lc_time_monotonic(lua_State *L) {

	struct timespec t;

	clock_gettime(CLOCK_MONOTONIC, &t);

	lua_pushnumber(L, tv2number(&t));

	return 1;

}

int luaopen_util_time(lua_State *L) {

	lua_createtable(L, 0, 2);

	{

		lua_pushcfunction(L, lc_time_realtime);

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

		lua_pushcfunction(L, lc_time_monotonic);

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

	}

	return 1;

}