diff --git a/Channel.cpp b/Channel.cpp
index a729860..db4a599 100644
--- a/Channel.cpp
+++ b/Channel.cpp
@@ -1,4 +1,5 @@
 #include "include.h"
+#include <cstring>
 #include <mutex>
 #include <condition_variable>
 #include <memory>
diff --git a/Event.cpp b/Event.cpp
index 9cfe3b2..ee3f345 100644
--- a/Event.cpp
+++ b/Event.cpp
@@ -1,4 +1,5 @@
 #include "include.h"
+#include <cstring>
 
 /*
 Event
diff --git a/Linux.cpp b/Linux.cpp
index f26c33e..3be6052 100644
--- a/Linux.cpp
+++ b/Linux.cpp
@@ -4,11 +4,18 @@ using namespace std;
 
 #ifndef _WIN32
 
-int lua_errno(lua_State* L, const char* hint)
+void put_linuxerror(lua_State* L, int errcode, const char* hint)
 {
-	char buff[1024] = { 0 };
-	strerror_r(errno, buff, 1024);
-	return luaL_error(L, "%s: %s", hint, buff);
+	char buff[4096] = { 0 };
+	strerror_r(errcode, buff, 4096);
+	if(hint)
+	{
+        lua_pushfstring(L, "%s: %s", hint, buff);
+	}
+	else
+	{
+        lua_pushstring(L, buff);
+	}
 }
 
 void PlatInit()
diff --git a/Renderer.cpp b/Renderer.cpp
index 0ecd4a0..b72d3ed 100644
--- a/Renderer.cpp
+++ b/Renderer.cpp
@@ -1,5 +1,6 @@
 #include "include.h"
 #include <SDL2/SDL2_gfxPrimitives.h>
+#include <cstring>
 
 /*
 class Renderer
@@ -169,7 +170,7 @@ int render_copyto(lua_State* L)
 	{
 		h = luaL_checkinteger(L, 6);
 	}
-	
+
 	SDL_Rect r;
 	r.w = w;
 	r.h = h;
diff --git a/TCPWin.cpp b/TCP.cpp
similarity index 82%
rename from TCPWin.cpp
rename to TCP.cpp
index a987a46..8d41026 100644
--- a/TCPWin.cpp
+++ b/TCP.cpp
@@ -1,12 +1,63 @@
 #include "TCP.h"
+#include <cstring>
 
 #ifdef _WIN32
 #define _WIN32_WINNT 0x0A00  // Win10
 #include <winsock2.h>
 #include <ws2tcpip.h>
 
+static int SetSocketBlocking(lua_State* L, int fd, bool blocking)
+{
+    u_long arg = blocking ? 0 : 1;
+    int ret = ioctlsocket(fd, FIONBIO, &arg);
+    if (ret)
+    {
+        int errcode = WSAGetLastError();
+        put_winerror(L, errcode, "ioctlsocket");
+        return lua_error(L);
+    }
+    return 0;
+}
+
+#else
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <netdb.h>
+#include <errno.h>
+#include <sys/epoll.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/epoll.h>
+
+static int SetSocketBlocking(lua_State* L, int fd, bool blocking)
+{
+    const int flags = fcntl(fd, F_GETFL, 0);
+    if( ((flags & O_NONBLOCK) && !blocking) || (!(flags & O_NONBLOCK) && blocking))
+    {
+        return 0;
+    }
+    int ret = fcntl(fd, F_SETFL, blocking ? flags & ~O_NONBLOCK : flags | O_NONBLOCK);
+    if (ret)
+    {
+        put_linuxerror(L, errno, "fcntl");
+        return lua_error(L);
+    }
+    return 0;
+}
+
+#define closesocket close
+#define WSAGetLastError() errno
+#define WSAEWOULDBLOCK EWOULDBLOCK
+#define put_winerror put_linuxerror
+
+#endif
+
 using namespace std;
 
+
 int tcp_socket_dtor(lua_State* L)
 {
 	auto s = lua_checkblock<SocketData>(L, 1, "LuaEngineTCPSocket");
@@ -133,7 +184,7 @@ int tcp_socket_listen(lua_State* L)
 			backlog = luaL_checkinteger(L, 3);
 		}
 	}
-	
+
 	sockaddr_in addr;
 	memset(&addr, 0, sizeof(addr));
 	addr.sin_family = AF_INET;
@@ -180,28 +231,8 @@ int tcp_socket_setblocking(lua_State* L)
 	{
 		return 0;
 	}
-	if (blocking)  // set to blocking
-	{
-		u_long arg = 0;
-		int ret = ioctlsocket(s->fd, FIONBIO, &arg);
-		if (ret)
-		{
-			int errcode = WSAGetLastError();
-			put_winerror(L, errcode, "ioctlsocket");
-			return lua_error(L);
-		}
-	}
-	else  // set to nonblocking
-	{
-		u_long arg = 1;
-		int ret = ioctlsocket(s->fd, FIONBIO, &arg);
-		if (ret)
-		{
-			int errcode = WSAGetLastError();
-			put_winerror(L, errcode, "ioctlsocket");
-			return lua_error(L);
-		}
-	}
+
+	SetSocketBlocking(L, s->fd, blocking);
 	return 0;
 }
 
@@ -234,7 +265,7 @@ int tcp_socket_accept(lua_State* L)
 {
 	auto s = lua_checkblock<SocketData>(L, 1, "LuaEngineTCPSocket");
 	sockaddr_in addr;
-	int addrsz = sizeof(addr);
+	socklen_t addrsz = sizeof(addr);
 	int ret = accept(s->fd, (sockaddr*)&addr, &addrsz);
 	if (ret < 0)
 	{
@@ -279,15 +310,7 @@ int tcp_socket_new(lua_State* L)
 	}
 	if (nonblocking)
 	{
-		u_long arg = 1;
-		int ret = ioctlsocket(fd, FIONBIO, &arg);
-		if (ret)
-		{
-			int errcode = WSAGetLastError();
-			closesocket(fd);
-			put_winerror(L, errcode, "ioctlsocket");
-			return lua_error(L);
-		}
+		SetSocketBlocking(L, fd, false);
 	}
 	put_tcp_socket(L, fd, nonblocking);
 	return 1;
@@ -301,5 +324,3 @@ void InitTCPSocket(lua_State* L)
 	lua_setfield(L, -2, "TCPSocket");
 	lua_pop(L, 2);
 }
-
-#endif
diff --git a/TCPLinux.cpp b/TCPLinux.cpp
deleted file mode 100644
index 32c4b56..0000000
--- a/TCPLinux.cpp
+++ /dev/null
@@ -1,265 +0,0 @@
-#include "TCP.h"
-
-#ifndef _WIN32
-#include <arpa/inet.h>
-#include <netinet/in.h>
-#include <netinet/tcp.h>
-#include <netdb.h>
-#include <errno.h>
-#include <sys/epoll.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/epoll.h>
-
-int tcp_socket_dtor(lua_State* L)
-{
-	auto s = lua_checkblock<TCPSocket>(L, 1, "LuaEngineTCPSocket");
-	if (s->fd > 0)
-	{
-		close(s->fd);
-		s->fd = -1;
-	}
-	s->~TCPSocket();
-	return 0;
-}
-
-int tcp_socket_close(lua_State* L)
-{
-	auto s = lua_checkblock<TCPSocket>(L, 1, "LuaEngineTCPSocket");
-	if (s->fd > 0)
-	{
-		close(s->fd);
-		s->fd = -1;
-	}
-	return 0;
-}
-
-int tcp_socket_send(lua_State* L)
-{
-	auto s = lua_checkblock<TCPSocket>(L, 1, "LuaEngineTCPSocket");
-	size_t sz;
-	const char* str = luaL_checklstring(L, 2, &sz);
-	size_t done = 0;
-	while (done < sz)
-	{
-		int ret = send(s->fd, str + done, sz - done, 0);
-		if (ret < 0)
-		{
-			if (s->nonblocking && errno == EWOULDBLOCK)
-			{
-				lua_pushinteger(L, done);
-				lua_pushboolean(L, true);
-				return 2;
-			}
-			return lua_errno(L, "send");
-		}
-		done += ret;
-	}
-	lua_pushinteger(L, done);
-	return 1;
-}
-
-int tcp_socket_recv(lua_State* L)
-{
-	auto s = lua_checkblock<TCPSocket>(L, 1, "LuaEngineTCPSocket");
-	int ret = recv(s->fd, s->data.data(), s->buffsz, 0);
-	if (ret < 0)
-	{
-		if (s->nonblocking && errno == EWOULDBLOCK)
-		{
-			lua_pushstring(L, "");
-			lua_pushboolean(L, true);
-			return 2;
-		}
-		return lua_errno(L, "recv");
-	}
-	lua_pushlstring(L, s->data.data(), ret);
-	return 1;
-}
-
-int tcp_socket_connect(lua_State* L)
-{
-	auto s = lua_checkblock<TCPSocket>(L, 1, "LuaEngineTCPSocket");
-	const char* ip = luaL_checkstring(L, 2);
-	int port = luaL_checkinteger(L, 3);
-
-	sockaddr_in addr;
-	memset(&addr, 0, sizeof(addr));
-	addr.sin_family = AF_INET;
-	addr.sin_addr.s_addr = inet_addr(ip);
-	addr.sin_port = htons(port);
-
-	int ret = connect(s->fd, (const sockaddr*)&addr, sizeof(addr));
-	if (ret < 0)
-	{
-		if (s->nonblocking && errno == EWOULDBLOCK)
-		{
-			lua_pushboolean(L, true);
-			return 1;
-		}
-		return lua_errno(L, "connect");
-	}
-
-	return 0;
-}
-
-int tcp_socket_listen(lua_State* L)
-{
-	auto s = lua_checkblock<TCPSocket>(L, 1, "LuaEngineTCPSocket");
-	const char* ip = NULL;
-	int port;
-	int backlog = 10;
-	if (lua_isstring(L, 2))
-	{
-		ip = luaL_checkstring(L, 2);
-		port = luaL_checkinteger(L, 3);
-		if (!lua_isnone(L, 4))
-		{
-			backlog = luaL_checkinteger(L, 4);
-		}
-	}
-	else
-	{
-		port = luaL_checkinteger(L, 2);
-		if (!lua_isnone(L, 3))
-		{
-			backlog = luaL_checkinteger(L, 3);
-		}
-	}
-
-	sockaddr_in addr;
-	memset(&addr, 0, sizeof(addr));
-	addr.sin_family = AF_INET;
-	if (ip && strcmp(ip, "0.0.0.0"))
-	{
-		addr.sin_addr.s_addr = inet_addr(ip);
-	}
-	else
-	{
-		addr.sin_addr.s_addr = INADDR_ANY;
-	}
-	addr.sin_port = htons(port);
-
-	int ret = bind(s->fd, (const sockaddr*)&addr, sizeof(addr));
-	if (ret < 0)
-	{
-		return lua_errno(L, "bind");
-	}
-	ret = listen(s->fd, backlog);
-	if (ret < 0)
-	{
-		return lua_errno(L, "listen");
-	}
-	return 0;
-}
-
-int tcp_socket_setblocking(lua_State* L)
-{
-	auto s = lua_checkblock<TCPSocket>(L, 1, "LuaEngineTCPSocket");
-	luaL_checkany(L, 2);
-	bool blocking = lua_toboolean(L, 2);
-	if (blocking != s->nonblocking)
-	{
-		return 0;
-	}
-	if (blocking)  // set to blocking
-	{
-		int flag = fcntl(s->fd, F_GETFL, 0);
-		if (flag < 0) return lua_errno(L, "fnctl");
-		flag &= ~O_NONBLOCK;
-		if (fcntl(s->fd, F_GETFL, flag) < 0) return lua_errno(L, "fnctl");
-	}
-	else  // set to nonblocking
-	{
-		int flag = fcntl(s->fd, F_GETFL, 0);
-		if (flag < 0) return lua_errno(L, "fnctl");
-		flag |= O_NONBLOCK;
-		if (fcntl(s->fd, F_GETFL, flag) < 0) return lua_errno(L, "fnctl");
-	}
-
-	return 0;
-}
-
-int tcp_socket_accept(lua_State* L);
-
-void put_tcp_socket(lua_State* L, int fd, bool nonblocking)
-{
-	auto s = new (lua_newblock<TCPSocket>(L)) TCPSocket;
-	if (luaL_newmetatable(L, "LuaEngineTCPSocket"))
-	{
-		lua_setfield_function(L, "__gc", tcp_socket_dtor);
-		lua_newtable(L);
-		lua_setfield_function(L, "close", tcp_socket_close);
-		lua_setfield_function(L, "send", tcp_socket_send);
-		lua_setfield_function(L, "recv", tcp_socket_recv);
-		lua_setfield_function(L, "listen", tcp_socket_listen);
-		lua_setfield_function(L, "connect", tcp_socket_connect);
-		lua_setfield_function(L, "accept", tcp_socket_accept);
-		lua_setfield_function(L, "setblocking", tcp_socket_setblocking);
-		lua_setfield(L, -2, "__index");
-	}
-	lua_setmetatable(L, -2);
-	s->fd = fd;
-	s->nonblocking = nonblocking;
-	s->buffsz = 4096;
-	s->data.resize(s->buffsz);
-}
-
-int tcp_socket_accept(lua_State* L)
-{
-	auto s = lua_checkblock<TCPSocket>(L, 1, "LuaEngineTCPSocket");
-	sockaddr_in addr;
-	socklen_t addrsz = sizeof(addr);
-	int ret = accept(s->fd, (sockaddr*)&addr, &addrsz);
-	if (ret < 0)
-	{
-		if (s->nonblocking && errno == EWOULDBLOCK)
-		{
-			return 0;
-		}
-		return lua_errno(L, "accept");
-	}
-	put_tcp_socket(L, ret, false);
-	lua_pushstring(L, inet_ntoa(addr.sin_addr));
-	lua_pushinteger(L, ntohs(addr.sin_port));
-	return 3;
-}
-
-int tcp_socket_new(lua_State* L)
-{
-	bool nonblocking = false;
-	if (!lua_isnone(L, 1))
-	{
-		if (lua_toboolean(L, 1))
-		{
-			nonblocking = true;
-		}
-	}
-	int fd = socket(AF_INET, SOCK_STREAM, 0);
-	if (fd < 0)
-	{
-		return lua_errno(L, "socket");
-	}
-	if (nonblocking)
-	{
-		int flag = fcntl(fd, F_GETFL, 0);
-		if (flag < 0) return lua_errno(L, "fnctl");
-		flag |= O_NONBLOCK;
-		if (fcntl(fd, F_GETFL, flag) < 0) return lua_errno(L, "fnctl");
-	}
-	put_tcp_socket(L, fd, nonblocking);
-	return 1;
-}
-
-void InitTCPSocket(lua_State* L)
-{
-	lua_getglobal(L, "package");
-	lua_getfield(L, -1, "loaded");
-	lua_pushcfunction(L, tcp_socket_new);
-	lua_setfield(L, -2, "TCPSocket");
-	lua_pop(L, 2);
-}
-
-#endif  // end of ifndef _WIN32
diff --git a/Windows.cpp b/Windows.cpp
index 5884bc4..8cfdf50 100644
--- a/Windows.cpp
+++ b/Windows.cpp
@@ -25,13 +25,6 @@ void put_winerror(lua_State* L, int errcode, const char* hint)
 	}
 }
 
-int lua_errno(lua_State* L, const char* hint)
-{
-	char buff[1024] = { 0 };
-	strerror_s(buff, errno);
-	return luaL_error(L, "%s: %s", hint, buff);
-}
-
 void PlatInit()
 {
 	WORD wd = MAKEWORD(2, 2);
diff --git a/include.h b/include.h
index 7af4f2f..5b2d235 100644
--- a/include.h
+++ b/include.h
@@ -138,6 +138,9 @@ void PlatInit();
 #ifdef _WIN32
 void put_winerror(lua_State* L, int errcode, const char* hint);
 
+#else
+void put_linuxerror(lua_State* L, int errcode, const char* hint);
+
 #endif  // ifdef _WIN32
 
 int lua_errno(lua_State* L, const char* hint);
diff --git a/main.cpp b/main.cpp
index 9571a0c..13e94af 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,7 +1,15 @@
 #include "LuaEngine.h"
+#include <cstring>
 #include <string>
 #include <iostream>
-#include <direct.h>
+
+#ifdef _WIN32
+#include <direct.h>  // _chdir
+#define ChangeDir _chdir
+#else
+#include <unistd.h>
+#define ChangeDir chdir
+#endif
 using namespace std;
 
 string LoadFile(const string& filename)
@@ -28,7 +36,7 @@ int main()
 {
 	InitEngine();
 	lua_State* L = CreateLuaEngine();
-	_chdir("game");
+	ChangeDir("game");
 	string code = LoadFile("app.lua");
 	if (luaL_loadbufferx(L, code.c_str(), code.size(), "ProgramMain", "t"))
 	{