+#if defined(MSDOS) && !defined(GETPID_IS_MEANINGLESS)
+# define GETPID_IS_MEANINGLESS
+#endif
+
+#ifdef WIN32
+#define get_last_sys_error() GetLastError()
+#define clear_sys_error() SetLastError(0)
+#if !defined(WINNT)
+#define WIN_CONSOLE_BUG
+#endif
+#else
+#define get_last_sys_error() errno
+#define clear_sys_error() errno=0
+#endif
+
+#if defined(WINDOWS) && !defined(__CYGWIN32__)
+#define get_last_socket_error() WSAGetLastError()
+#define clear_socket_error() WSASetLastError(0)
+#define readsocket(s,b,n) recv((s),(b),(n),0)
+#define writesocket(s,b,n) send((s),(b),(n),0)
+#define EADDRINUSE WSAEADDRINUSE
+#elif defined(MAC_OS_pre_X)
+#define get_last_socket_error() errno
+#define clear_socket_error() errno=0
+#define closesocket(s) MacSocket_close(s)
+#define readsocket(s,b,n) MacSocket_recv((s),(b),(n),true)
+#define writesocket(s,b,n) MacSocket_send((s),(b),(n))
+#else
+#define get_last_socket_error() errno
+#define clear_socket_error() errno=0
+#define ioctlsocket(a,b,c) ioctl(a,b,c)
+#define closesocket(s) close(s)
+#define readsocket(s,b,n) read((s),(b),(n))
+#define writesocket(s,b,n) write((s),(b),(n))
+#endif
+