better dummy implementation of IsInput/ErrorAvailable() (it's still wrong but now no more wrong than before my changes)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16658 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/process.cpp

@@ -127,17 +127,17 @@ void wxProcess::SetPipeStreams(wxInputStream *inputSstream,
 
 bool wxProcess::IsInputOpened() const
 {
-    return TRUE;
+    return m_inputStream != NULL;
 }
 
 bool wxProcess::IsInputAvailable() const
 {
-    return FALSE;
+    return m_inputStream && !m_inputStream->Eof();
 }
 
 bool wxProcess::IsErrorAvailable() const
 {
-    return FALSE;
+    return m_errorStream && !m_errorStream->Eof();
 }
 
 #endif // !Win32 && !Unix