On Windows, call WSAGetLastError() to retrieve the error number.
Bugfix candidate, will backport to release22-maint myself.
diff --git a/Modules/selectmodule.c b/Modules/selectmodule.c
index 2caa022..8444c12 100644
--- a/Modules/selectmodule.c
+++ b/Modules/selectmodule.c
@@ -39,7 +39,7 @@
#endif
#ifdef MS_WINDOWS
-#include <winsock.h>
+#include <windows.h>
#else
#ifdef __BEOS__
#include <net/socket.h>
@@ -273,9 +273,15 @@
n = select(max, &ifdset, &ofdset, &efdset, tvp);
Py_END_ALLOW_THREADS
+#ifdef MS_WINDOWS
+ if (n == SOCKET_ERROR) {
+ PyErr_SetExcFromWindowsErr(SelectError, WSAGetLastError());
+ }
+#else
if (n < 0) {
PyErr_SetFromErrno(SelectError);
}
+#endif
else if (n == 0) {
/* optimization */
ifdlist = PyList_New(0);