1 files changed, 119 insertions, 0 deletions
diff --git a/src/l_timer.c b/src/l_timer.c
new file mode 100644
index 0000000..129fd13
--- /dev/null
+++ b/src/l_timer.c
@@ -0,0 +1,119 @@
+/*
+ *  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 <stdio.h>
+#include <errno.h>
+
+#include "l_timer.h"
+
+#define LUA_TIMER_UDATA_NAME "struct timeval"
+
+static int l_timer_new(lua_State *L)
+{
+  int ms = luaL_optint(L, 1, 0);
+  struct timeval* tv = (struct timeval*)lua_newuserdata(L, sizeof(struct timeval));
+  luaL_newmetatable(L, LUA_TIMER_UDATA_NAME);
+  lua_setmetatable(L, -2);
+  tv->tv_sec = ms/1000;
+  tv->tv_usec = (ms%1000)*1000;
+  return 1;
+}
+
+static int l_timer_now(lua_State *L)
+{
+  struct timeval* now = (struct timeval*)lua_newuserdata(L, sizeof(struct timeval));
+  int ret = gettimeofday(now, NULL);
+  if(ret) {
+    lua_pushnil(L);
+    lua_pushstring(L, strerror(errno)); // FIXXXXXME: strerror is not threadsafe!!!
+    return 2;
+  }
+  luaL_newmetatable(L, LUA_TIMER_UDATA_NAME);
+  lua_setmetatable(L, -2);
+  return 1;
+}
+
+static int l_timer_add(lua_State *L)
+{
+  struct timeval* a = (struct timeval*)luaL_checkudata(L, 1, LUA_TIMER_UDATA_NAME);
+  struct timeval* b = (struct timeval*)luaL_checkudata(L, 2, LUA_TIMER_UDATA_NAME);
+  struct timeval* res = (struct timeval*)lua_newuserdata(L, sizeof(struct timeval));
+  luaL_newmetatable(L, LUA_TIMER_UDATA_NAME);
+  lua_setmetatable(L, -2);
+  timeradd(a, b, res);
+  return 1;
+}
+
+static int l_timer_sub(lua_State *L)
+{
+  struct timeval* a = (struct timeval*)luaL_checkudata(L, 1, LUA_TIMER_UDATA_NAME);
+  struct timeval* b = (struct timeval*)luaL_checkudata(L, 2, LUA_TIMER_UDATA_NAME);
+  struct timeval* res = (struct timeval*)lua_newuserdata(L, sizeof(struct timeval));
+  luaL_newmetatable(L, LUA_TIMER_UDATA_NAME);
+  lua_setmetatable(L, -2);
+  timersub(a, b, res);
+  return 1;
+}
+
+static int l_timer_cmp(lua_State *L)
+{
+  struct timeval* a = (struct timeval*)luaL_checkudata(L, 1, LUA_TIMER_UDATA_NAME);
+  struct timeval* b = (struct timeval*)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;
+}