import errno import os import select import subprocess import sys import textwrap import unittest from test import support @unittest.skipIf((sys.platform[:3]=='win'), "can't easily test on this system") class SelectTestCase(unittest.TestCase): class Nope: pass class Almost: def fileno(self): return 'fileno' def test_error_conditions(self): self.assertRaises(TypeError, select.select, 1, 2, 3) self.assertRaises(TypeError, select.select, [self.Nope()], [], []) self.assertRaises(TypeError, select.select, [self.Almost()], [], []) self.assertRaises(TypeError, select.select, [], [], [], "not a number") self.assertRaises(ValueError, select.select, [], [], [], -1) # Issue #12367: http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/155606 @unittest.skipIf(sys.platform.startswith('freebsd'), 'skip because of a FreeBSD bug: kern/155606') def test_errno(self): with open(__file__, 'rb') as fp: fd = fp.fileno() fp.close() try: select.select([fd], [], [], 0) except OSError as err: self.assertEqual(err.errno, errno.EBADF) else: self.fail("exception not raised") def test_returned_list_identity(self): # See issue #8329 r, w, x = select.select([], [], [], 1) self.assertIsNot(r, w) self.assertIsNot(r, x) self.assertIsNot(w, x) @unittest.skipUnless(hasattr(os, 'popen'), "need os.popen()") def test_select(self): code = textwrap.dedent(''' import time for i in range(10): print("testing...", flush=True) time.sleep(0.050) ''') cmd = [sys.executable, '-I', '-c', code] with subprocess.Popen(cmd, stdout=subprocess.PIPE) as proc: pipe = proc.stdout for timeout in (0, 1, 2, 4, 8, 16) + (None,)*10: if support.verbose: print(f'timeout = {timeout}') rfd, wfd, xfd = select.select([pipe], [], [], timeout) self.assertEqual(wfd, []) self.assertEqual(xfd, []) if not rfd: continue if rfd == [pipe]: line = pipe.readline() if support.verbose: print(repr(line)) if not line: if support.verbose: print('EOF') break continue self.fail('Unexpected return values from select():', rfd, wfd, xfd) # Issue 16230: Crash on select resized list def test_select_mutated(self): a = [] class F: def fileno(self): del a[-1] return sys.__stdout__.fileno() a[:] = [F()] * 10 self.assertEqual(select.select([], a, []), ([], a[:5], [])) def tearDownModule(): support.reap_children() if __name__ == "__main__": unittest.main()