diff --git a/UniLua/LuaOsLib.cs b/UniLua/LuaOsLib.cs
index 0077645..90e343f 100644
--- a/UniLua/LuaOsLib.cs
+++ b/UniLua/LuaOsLib.cs
@@ -2,7 +2,8 @@
 namespace UniLua
 {
 	using System.Diagnostics;
-
+	using CMLeonOS;
+	
 	internal class LuaOSLib
 	{
 		public const string LIB_NAME = "os";
@@ -14,6 +15,10 @@ namespace UniLua
 #if !UNITY_WEBPLAYER
 				new NameFuncPair("clock", 	OS_Clock),
 				new NameFuncPair("gethostname", OS_Gethostname),
+				new NameFuncPair("getenv", OS_Getenv),
+				new NameFuncPair("setenv", OS_Setenv),
+				new NameFuncPair("delenv", OS_Delenv),
+				new NameFuncPair("addenv", OS_Addenv),
 #endif
 			};
 
@@ -34,6 +39,47 @@ namespace UniLua
 			lua.PushString(hostname);
 			return 1;
 		}
+
+		private static int OS_Getenv( ILuaState lua )
+		{
+			string varName = lua.L_CheckString(1);
+			string varValue = EnvironmentVariableManager.Instance.GetVariable(varName);
+			if (varValue == null)
+			{
+				lua.PushNil();
+			}
+			else
+			{
+				lua.PushString(varValue);
+			}
+			return 1;
+		}
+
+		private static int OS_Setenv( ILuaState lua )
+		{
+			string varName = lua.L_CheckString(1);
+			string varValue = lua.L_CheckString(2);
+			EnvironmentVariableManager.Instance.SetVariable(varName, varValue);
+			lua.PushBoolean(true);
+			return 1;
+		}
+
+		private static int OS_Delenv( ILuaState lua )
+		{
+			string varName = lua.L_CheckString(1);
+			bool success = EnvironmentVariableManager.Instance.DeleteVariable(varName);
+			lua.PushBoolean(success);
+			return 1;
+		}
+
+		private static int OS_Addenv( ILuaState lua )
+		{
+			string varName = lua.L_CheckString(1);
+			string varValue = lua.L_CheckString(2);
+			EnvironmentVariableManager.Instance.SetVariable(varName, varValue);
+			lua.PushBoolean(true);
+			return 1;
+		}
 #endif
 	}
 }