+#elif defined(OPENSSL_SYS_VMS)
+#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) recv((s),(b),(n),0)
+#define writesocket(s,b,n) send((s),(b),(n),0)
+#elif defined(OPENSSL_SYS_VXWORKS)
+#define get_last_socket_error() errno
+#define clear_socket_error() errno=0
+#define ioctlsocket(a,b,c) ioctl((a),(b),(int)(c))
+#define closesocket(s) close(s)
+#define readsocket(s,b,n) read((s),(b),(n))
+#define writesocket(s,b,n) write((s),(char *)(b),(n))
+#elif defined(OPENSSL_SYS_NETWARE)
+#if defined(NETWARE_BSDSOCK)
+#define get_last_socket_error() errno
+#define clear_socket_error() errno=0
+#define closesocket(s) close(s)
+#define readsocket(s,b,n) recv((s),(b),(n),0)
+#define writesocket(s,b,n) send((s),(b),(n),0)
+#else
+#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)
+#endif