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import os
import select
import sys
import tempfile
import unittest

PREFIX = 'select_graalpython_test'
TEMP_DIR = tempfile.gettempdir()
TEST_FILENAME = f'{PREFIX}_{os.getpid()}_tmp1'
TEST_FILENAME_FULL_PATH = os.path.join(TEMP_DIR, TEST_FILENAME)

try:
    __graalpython__.posix_module_backend()
except:
    class GP:
        def posix_module_backend(self):
            return 'cpython'
    __graalpython__ = GP()

class SelectTests(unittest.TestCase):
    def test_select_raises_on_object_with_no_fileno_func(self):
        self.assertRaises(TypeError, select.select, 'abc', [], [], 0)

    def test_select_uses_dunder_index_of_timeout_obj(self):
        class MyVal:
            def __init__(self):
                self.called_index = 0
            def __index__(self):
                self.called_index += 1
                return 1

        v = MyVal()
        select.select([], [], [], v)
        assert v.called_index == 1

    def test_select_timeout_arg_validation(self):
        self.assertRaises(ValueError, select.select, [], [], [], float("nan"))
        self.assertRaises(OverflowError, select.select, [], [], [], 1234567891234567891234567.5)
        # Still in long range, but once converted to ns, it will overflow
        self.assertRaises(OverflowError, select.select, [], [], [], 9223372036854775806)

    @unittest.skipUnless(__graalpython__.posix_module_backend() != 'java',
                         'The java backend does not support select for ordinary files, only sockets.')
    def test_select_result_duplicate_fds_preserve_objs_order(self):
        class F:
            def __init__(self, fd):
                self.fd = fd
            def fileno(self):
                return self.fd

        os.close(os.open(TEST_FILENAME_FULL_PATH, os.O_WRONLY | os.O_CREAT))
        with open(TEST_FILENAME_FULL_PATH, 'r') as f:
            stdout_fd = sys.__stdout__.fileno()
            # stdout is not ready for reading, but the file should be,
            # we should get back both objects and in the right order
            fds = [F(f.fileno()), F(stdout_fd), F(f.fileno())]
            res = select.select(fds, [], [], 1)
            assert res == ([fds[0], fds[2]], [], [])
