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