New functions for extension writers on Windows:

PyErr_SetExcFromWindowsErr(), PyErr_SetExcFromWindowsErrWithFilename().

Similar to PyErr_SetFromWindowsErrWithFilename() and
PyErr_SetFromWindowsErr(), but they allow to specify
the exception type to raise. Available on Windows.

See SF patch #576458.

Doc/api/exceptions.tex

@@ -208,6 +208,14 @@ for each thread.
   Availability: Windows.
 \end{cfuncdesc}
 
+\begin{cfuncdesc}{PyObject*}{PyErr_SetExcFromWindowsErr}{PyObject *type,
+	                                                 int ierr}
+  Similar to \cfunction{PyErr_SetFromWindowsErr()}, with an additional
+  parameter specifying the exception type to be raised.
+  Availability: Windows.
+  \versionadded{2.3}
+\end{cfuncdesc}
+
 \begin{cfuncdesc}{PyObject*}{PyErr_SetFromWindowsErrWithFilename}{int ierr,
                                                                 char *filename}
   Similar to \cfunction{PyErr_SetFromWindowsErr()}, with the
@@ -217,6 +225,14 @@ for each thread.
   Availability: Windows.
 \end{cfuncdesc}
 
+\begin{cfuncdesc}{PyObject*}{PyErr_SetExcFromWindowsErrWithFilename}
+	{PyObject *type, int ierr, char *filename}
+  Similar to \cfunction{PyErr_SetFromWindowsErrWithFilename()}, with
+  an additional parameter specifying the exception type to be raised.
+  Availability: Windows.
+  \versionadded{2.3}
+\end{cfuncdesc}
+
 \begin{cfuncdesc}{void}{PyErr_BadInternalCall}{}
   This is a shorthand for \samp{PyErr_SetString(PyExc_TypeError,
   \var{message})}, where \var{message} indicates that an internal

Include/pyerrors.h

@@ -83,6 +83,9 @@ extern DL_IMPORT(PyObject *) PyErr_Format(PyObject *, const char *, ...)
 #ifdef MS_WINDOWS
 extern DL_IMPORT(PyObject *) PyErr_SetFromWindowsErrWithFilename(int, const char *);
 extern DL_IMPORT(PyObject *) PyErr_SetFromWindowsErr(int);
+extern DL_IMPORT(PyObject *) PyErr_SetExcFromWindowsErrWithFilename(
+	PyObject *,int, const char *);
+extern DL_IMPORT(PyObject *) PyErr_SetExcFromWindowsErr(PyObject *, int);
 #endif
 
 /* Export the old function so that the existing API remains available: */

Misc/NEWS

@@ -380,6 +380,12 @@ Build
 
 C API
 
+- New functions PyErr_SetExcFromWindowsErr() and
+  PyErr_SetExcFromWindowsErrWithFilename(). Similar to
+  PyErr_SetFromWindowsErrWithFilename() and
+  PyErr_SetFromWindowsErr(), but they allow to specify
+  the exception type to raise. Available on Windows.
+
 - Py_FatalError() is now declared as taking a const char* argument.  It
   was previously declared without const.  This should not affect working
   code.

Python/errors.c

@@ -337,7 +337,8 @@ PyErr_SetFromErrno(PyObject *exc)
 
 #ifdef MS_WINDOWS 
 /* Windows specific error code handling */
-PyObject *PyErr_SetFromWindowsErrWithFilename(
+PyObject *PyErr_SetExcFromWindowsErrWithFilename(
+	PyObject *exc,
 	int ierr,
 	const char *filename)
 {
@@ -366,16 +367,29 @@ PyObject *PyErr_SetFromWindowsErrWithFilename(
 	else
 		v = Py_BuildValue("(is)", err, s);
 	if (v != NULL) {
-		PyErr_SetObject(PyExc_WindowsError, v);
+		PyErr_SetObject(exc, v);
 		Py_DECREF(v);
 	}
 	LocalFree(s);
 	return NULL;
 }
 
+PyObject *PyErr_SetExcFromWindowsErr(PyObject *exc, int ierr)
+{
+	return PyErr_SetExcFromWindowsErrWithFilename(exc, ierr, NULL);
+}
+
 PyObject *PyErr_SetFromWindowsErr(int ierr)
 {
-	return PyErr_SetFromWindowsErrWithFilename(ierr, NULL);
+	return PyErr_SetExcFromWindowsErrWithFilename(PyExc_WindowsError,
+						      ierr, NULL);
+}
+PyObject *PyErr_SetFromWindowsErrWithFilename(
+	int ierr,
+	const char *filename)
+{
+	return PyErr_SetExcFromWindowsErrWithFilename(PyExc_WindowsError,
+						      ierr, filename);
 }
 #endif /* MS_WINDOWS */