Started over.

io/XIO.cpp

@@ -0,0 +1,46 @@
+#include "XIO.h"
+
+//
+// XIOErrno
+//
+
+XIOErrno::XIOErrno() : MXErrno()
+{
+	// do nothing
+}
+
+XIOErrno::XIOErrno(int err) : MXErrno(err)
+{
+	// do nothing
+}
+
+
+//
+// XIOClose
+//
+
+CString					XIOClose::getWhat() const throw()
+{
+	return format("XIOClose", "close: %1", XIOErrno::getErrstr());
+}
+
+
+//
+// XIOClosed
+//
+
+CString					XIOClosed::getWhat() const throw()
+{
+	return format("XIOClosed", "already closed");
+}
+
+
+//
+// XIOEndOfStream
+//
+
+CString					XIOEndOfStream::getWhat() const throw()
+{
+	return format("XIOEndOfStream", "reached end of stream");
+}
+