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/*
* gcsd
*
* gcsd the generic command sequencer daemon can be used to serialize
* commands sent over various paralell communication channels to a
* single command output. It can be seen as a multiplexer for any
* kind of communication between a single resource and various clients
* which want to submit commands to it or query information from it.
* gcsd is written in C and Lua. The goal is to provide an easy to
* understand high level API based on Lua which can be used to
* implement the business logic of the so formed multiplexer daemon.
*
*
* Copyright (C) 2009-2010 Markus Grueneis <gimpf@spreadspace.org>
* Christian Pointner <equinox@spreadspace.org>
*
* This file is part of gcsd.
*
* gcsd is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* gcsd is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with gcsd. If not, see <http://www.gnu.org/licenses/>.
*/
#include <lua.h>
#include <lauxlib.h>
#include <sys/time.h>
#include <string.h>
#include <errno.h>
#include "l_timer.h"
typedef struct timeval timer_t;
#define LUA_TIMER_UDATA_NAME "timer_t"
static int l_timer_add(lua_State *L);
static int l_timer_sub(lua_State *L);
static timer_t* newtimerudata(lua_State *L)
{
timer_t* tv = (timer_t*)lua_newuserdata(L, sizeof(timer_t));
if(luaL_newmetatable(L, LUA_TIMER_UDATA_NAME)) {
lua_pushliteral(L, "__add");
lua_pushcfunction(L, l_timer_add);
lua_settable(L, -3);
lua_pushliteral(L, "__sub");
lua_pushcfunction(L, l_timer_sub);
lua_settable(L, -3);
}
lua_setmetatable(L, -2);
return tv;
}
static int l_timer_new(lua_State *L)
{
int ms = luaL_optint(L, 1, 0);
timer_t* tv = newtimerudata(L);
tv->tv_sec = ms/1000;
tv->tv_usec = (ms%1000)*1000;
return 1;
}
static int l_timer_now(lua_State *L)
{
timer_t* now = newtimerudata(L);
int ret = gettimeofday(now, NULL);
if(ret) {
lua_pushnil(L);
lua_pushstring(L, strerror(errno)); // FIXXXXXME: strerror is not threadsafe!!!
return 2;
}
return 1;
}
static int l_timer_add(lua_State *L)
{
timer_t* a = (timer_t*)luaL_checkudata(L, 1, LUA_TIMER_UDATA_NAME);
timer_t* b = (timer_t*)luaL_checkudata(L, 2, LUA_TIMER_UDATA_NAME);
timer_t* res = newtimerudata(L);
timeradd(a, b, res);
return 1;
}
static int l_timer_sub(lua_State *L)
{
timer_t* a = (timer_t*)luaL_checkudata(L, 1, LUA_TIMER_UDATA_NAME);
timer_t* b = (timer_t*)luaL_checkudata(L, 2, LUA_TIMER_UDATA_NAME);
timer_t* res = newtimerudata(L);
timersub(a, b, res);
return 1;
}
static int l_timer_cmp(lua_State *L)
{
timer_t* a = (timer_t*)luaL_checkudata(L, 1, LUA_TIMER_UDATA_NAME);
timer_t* b = (timer_t*)luaL_checkudata(L, 2, LUA_TIMER_UDATA_NAME);
if(timercmp(a, b, <))
lua_pushinteger(L, -1);
else if(timercmp(a, b, >))
lua_pushinteger(L, 1);
else
lua_pushinteger(L, 0);
return 1;
}
static const struct luaL_reg timer_funcs [] = {
{ "new", l_timer_new },
{ "now", l_timer_now },
{ "add", l_timer_add },
{ "sub", l_timer_sub },
{ "cmp", l_timer_cmp },
{ NULL, NULL }
};
LUALIB_API int luaopen_timer(lua_State *L)
{
luaL_register(L, LUA_TIMERLIBNAME, timer_funcs);
return 1;
}
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