Issue #22042: Avoid dangerous C cast in socket.setblocking()
Avoid cast from (int*) to (u_long*), even if sizeof(int) == sizeof(u_long).
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 780447c..f510f0e 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -548,6 +548,9 @@
static int
internal_setblocking(PySocketSockObject *s, int block)
{
+#ifdef MS_WINDOWS
+ u_long arg;
+#endif
#if !defined(MS_WINDOWS) \
&& !((defined(HAVE_SYS_IOCTL_H) && defined(FIONBIO)))
int delay_flag, new_delay_flag;
@@ -574,8 +577,8 @@
fcntl(s->sock_fd, F_SETFL, new_delay_flag);
#endif
#else /* MS_WINDOWS */
- block = !block;
- ioctlsocket(s->sock_fd, FIONBIO, (u_long*)&block);
+ arg = !block;
+ ioctlsocket(s->sock_fd, FIONBIO, &arg);
#endif /* MS_WINDOWS */
Py_END_ALLOW_THREADS