Issue #5677: Explicitly forbid write operations on read-only file objects,
and read operations on write-only file objects. On Windows, the system C
library would return a bogus result; on Solaris, it was possible to crash
the interpreter. Patch by Stefan Krah.
diff --git a/Include/fileobject.h b/Include/fileobject.h
index 77903be..83e9c25 100644
--- a/Include/fileobject.h
+++ b/Include/fileobject.h
@@ -28,6 +28,8 @@
PyObject *weakreflist; /* List of weak references */
int unlocked_count; /* Num. currently running sections of code
using f_fp with the GIL released. */
+ int readable;
+ int writable;
} PyFileObject;
PyAPI_DATA(PyTypeObject) PyFile_Type;