@@ -471,11 +471,12 @@
 			_atEndOfStream = true;
 			return 0;
 		}
 
 		@throw [OFReadFailedException exceptionWithObject: self
-						  requestedLength: length];
+						  requestedLength: length
+							    errNo: EIO];
 	}
 #endif
 
 	if (ret == 0)
 		_atEndOfStream = true;
@@ -506,11 +507,11 @@
 	if (_writePipe[1] == NULL)
 		@throw [OFNotOpenException exceptionWithObject: self];
 
 	if (!WriteFile(_writePipe[1], buffer, (DWORD)length, &ret, NULL) ||
 	    ret != (DWORD)length) {
-		int errNo = 0;
+		int errNo = EIO;
 
 		if (GetLastError() == ERROR_BROKEN_PIPE)
 			errNo = EPIPE;
 
 		@throw [OFWriteFailedException exceptionWithObject: self