[3.12] gh-126876: Fix socket internal_select() for large timeout (GH-126968) (#127003)

gh-126876: Fix socket internal_select() for large timeout (GH-126968)

If the timeout is larger than INT_MAX, replace it with INT_MAX, in
the poll() code path.

Add an unit test.
(cherry picked from commit b3687ad454)

Co-authored-by: Victor Stinner <vstinner@python.org>

Lib/test/test_socket.py

@@ -5059,6 +5059,36 @@ class NonBlockingTCPTests(ThreadedTCPSocketTest):
         # send data: recv() will no longer block
         self.cli.sendall(MSG)
 
+    @support.cpython_only
+    def testLargeTimeout(self):
+        # gh-126876: Check that a timeout larger than INT_MAX is replaced with
+        # INT_MAX in the poll() code path. The following assertion must not
+        # fail: assert(INT_MIN <= ms && ms <= INT_MAX).
+        import _testcapi
+        large_timeout = _testcapi.INT_MAX + 1
+
+        # test recv() with large timeout
+        conn, addr = self.serv.accept()
+        self.addCleanup(conn.close)
+        try:
+            conn.settimeout(large_timeout)
+        except OverflowError:
+            # On Windows, settimeout() fails with OverflowError, whereas
+            # we want to test recv(). Just give up silently.
+            return
+        msg = conn.recv(len(MSG))
+
+    def _testLargeTimeout(self):
+        # test sendall() with large timeout
+        import _testcapi
+        large_timeout = _testcapi.INT_MAX + 1
+        self.cli.connect((HOST, self.port))
+        try:
+            self.cli.settimeout(large_timeout)
+        except OverflowError:
+            return
+        self.cli.sendall(MSG)
+
 
 class FileObjectClassTestCase(SocketConnectedTest):
     """Unit tests for the object returned by socket.makefile()