Bug #1415
On Windows fileno(stdout) and fileno(stderr) can return an invalid file descriptor number (-2 on my machine). It happens only for pythonw.exe but not for python.exe.
Catch the problem ASAP in PyFile_NewStdPrinter(). I've also removed the call to PyErr_BadInternalCall(). It was causing a seg fault because the exceptions aren't available yet.
diff --git a/Objects/fileobject.c b/Objects/fileobject.c
index c6c7d8e..c4feed1 100644
--- a/Objects/fileobject.c
+++ b/Objects/fileobject.c
@@ -352,8 +352,8 @@
{
PyStdPrinter_Object *self;
- if (fd != fileno(stdout) && fd != fileno(stderr)) {
- PyErr_BadInternalCall();
+ if ((fd != fileno(stdout) && fd != fileno(stderr)) || fd < 0) {
+ /* not enough infrastructure for PyErr_BadInternalCall() */
return NULL;
}