Clarify os.strerror()s exception behavior.

3fc974f2 · Georg Brandl · 627a666d · 3fc974f2
Commit 3fc974f2 authored May 11, 2008 by Georg Brandl
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Doc/library/os.rst Doc/library/os.rst +2 -1

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--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -285,7 +285,8 @@ process and user.
 .. function:: strerror(code)

   Return the error message corresponding to the error code in *code*.
-   Availability: Unix, Windows.
+   On platforms where :cfunc:`strerror` returns ``NULL`` when given an unknown
+   error number, :exc:`ValueError` is raised.  Availability: Unix, Windows.


 .. function:: umask(mask)