mirror of https://github.com/python/cpython
57 lines
1.8 KiB
Python
57 lines
1.8 KiB
Python
"""This test checks for correct wait3() behavior.
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"""
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import os
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import subprocess
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import sys
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import time
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import unittest
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from test.fork_wait import ForkWait
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from test import support
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if not support.has_fork_support:
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raise unittest.SkipTest("requires working os.fork()")
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if not hasattr(os, 'wait3'):
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raise unittest.SkipTest("os.wait3 not defined")
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class Wait3Test(ForkWait):
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def wait_impl(self, cpid, *, exitcode):
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# This many iterations can be required, since some previously run
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# tests (e.g. test_ctypes) could have spawned a lot of children
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# very quickly.
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deadline = time.monotonic() + support.SHORT_TIMEOUT
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while time.monotonic() <= deadline:
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# wait3() shouldn't hang, but some of the buildbots seem to hang
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# in the forking tests. This is an attempt to fix the problem.
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spid, status, rusage = os.wait3(os.WNOHANG)
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if spid == cpid:
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break
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time.sleep(0.1)
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self.assertEqual(spid, cpid)
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self.assertEqual(os.waitstatus_to_exitcode(status), exitcode)
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self.assertTrue(rusage)
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def test_wait3_rusage_initialized(self):
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# Ensure a successful wait3() call where no child was ready to report
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# its exit status does not return uninitialized memory in the rusage
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# structure. See bpo-36279.
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args = [sys.executable, '-c', 'import sys; sys.stdin.read()']
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proc = subprocess.Popen(args, stdin=subprocess.PIPE)
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try:
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pid, status, rusage = os.wait3(os.WNOHANG)
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self.assertEqual(0, pid)
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self.assertEqual(0, status)
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self.assertEqual(0, sum(rusage))
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finally:
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proc.stdin.close()
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proc.wait()
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def tearDownModule():
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support.reap_children()
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if __name__ == "__main__":
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unittest.main()
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