test_socket.py 文件源码

def checkTruncatedArray(self, ancbuf, maxdata, mindata=0):
        # Check that file descriptor data is truncated to between
        # mindata and maxdata bytes when received with buffer size
        # ancbuf, and that any complete file descriptor numbers are
        # valid.
        msg, ancdata, flags, addr = self.doRecvmsg(self.serv_sock,
                                                   len(MSG), ancbuf)
        self.assertEqual(msg, MSG)
        self.checkRecvmsgAddress(addr, self.cli_addr)
        self.checkFlags(flags, eor=True, checkset=socket.MSG_CTRUNC)

        if mindata == 0 and ancdata == []:
            return
        self.assertEqual(len(ancdata), 1)
        cmsg_level, cmsg_type, cmsg_data = ancdata[0]
        self.assertEqual(cmsg_level, socket.SOL_SOCKET)
        self.assertEqual(cmsg_type, socket.SCM_RIGHTS)
        self.assertGreaterEqual(len(cmsg_data), mindata)
        self.assertLessEqual(len(cmsg_data), maxdata)
        fds = array.array("i")
        fds.frombytes(cmsg_data[:
                len(cmsg_data) - (len(cmsg_data) % fds.itemsize)])
        self.checkFDs(fds)