Method sendAncillaryIfPossible

Lib/test/test_socket.py:4214–4223

(self, msg, ancdata)

            len(MSG))

    def sendAncillaryIfPossible(self, msg, ancdata):
        # Try to send msg and ancdata to server, but if the system
        # call fails, just send msg with no ancillary data.
        try:
            nbytes = self.sendmsgToServer([msg], ancdata)
        except OSError as e:
            # Check that it was the system call that failed
            self.assertIsInstance(e.errno, int)
            nbytes = self.sendmsgToServer([msg])
        self.assertEqual(nbytes, len(msg))

    @unittest.skipIf(is_apple, "skipping, see issue #12958")
    def testFDPassEmpty(self):