revision 1.86 of libos.tex
SF bug 563750 (Alex Martelli): posix_tmpfile():
The file returned by tmpfile() has mode w+b, so use that in the call
to PyFile_FromFile().
Bugfix candidate.
\end{funcdesc}
\begin{funcdesc}{tmpfile}{}
-Return a new file object opened in update mode (\samp{w+}). The file
+Return a new file object opened in update mode (\samp{w+b}). The file
has no directory entries associated with it and will be automatically
deleted once there are no file descriptors for the file.
Availability: \UNIX, Windows.