| 1 | n/a | import os |
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| 2 | n/a | import signal |
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| 3 | n/a | import subprocess |
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| 4 | n/a | import sys |
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| 5 | n/a | import time |
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| 6 | n/a | import unittest |
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| 7 | n/a | |
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| 8 | n/a | |
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| 9 | n/a | class SIGUSR1Exception(Exception): |
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| 10 | n/a | pass |
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| 11 | n/a | |
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| 12 | n/a | |
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| 13 | n/a | class InterProcessSignalTests(unittest.TestCase): |
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| 14 | n/a | def setUp(self): |
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| 15 | n/a | self.got_signals = {'SIGHUP': 0, 'SIGUSR1': 0, 'SIGALRM': 0} |
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| 16 | n/a | |
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| 17 | n/a | def sighup_handler(self, signum, frame): |
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| 18 | n/a | self.got_signals['SIGHUP'] += 1 |
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| 19 | n/a | |
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| 20 | n/a | def sigusr1_handler(self, signum, frame): |
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| 21 | n/a | self.got_signals['SIGUSR1'] += 1 |
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| 22 | n/a | raise SIGUSR1Exception |
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| 23 | n/a | |
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| 24 | n/a | def wait_signal(self, child, signame, exc_class=None): |
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| 25 | n/a | try: |
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| 26 | n/a | if child is not None: |
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| 27 | n/a | # This wait should be interrupted by exc_class |
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| 28 | n/a | # (if set) |
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| 29 | n/a | child.wait() |
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| 30 | n/a | |
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| 31 | n/a | timeout = 10.0 |
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| 32 | n/a | deadline = time.monotonic() + timeout |
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| 33 | n/a | |
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| 34 | n/a | while time.monotonic() < deadline: |
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| 35 | n/a | if self.got_signals[signame]: |
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| 36 | n/a | return |
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| 37 | n/a | signal.pause() |
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| 38 | n/a | except BaseException as exc: |
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| 39 | n/a | if exc_class is not None and isinstance(exc, exc_class): |
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| 40 | n/a | # got the expected exception |
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| 41 | n/a | return |
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| 42 | n/a | raise |
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| 43 | n/a | |
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| 44 | n/a | self.fail('signal %s not received after %s seconds' |
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| 45 | n/a | % (signame, timeout)) |
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| 46 | n/a | |
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| 47 | n/a | def subprocess_send_signal(self, pid, signame): |
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| 48 | n/a | code = 'import os, signal; os.kill(%s, signal.%s)' % (pid, signame) |
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| 49 | n/a | args = [sys.executable, '-I', '-c', code] |
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| 50 | n/a | return subprocess.Popen(args) |
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| 51 | n/a | |
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| 52 | n/a | def test_interprocess_signal(self): |
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| 53 | n/a | # Install handlers. This function runs in a sub-process, so we |
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| 54 | n/a | # don't worry about re-setting the default handlers. |
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| 55 | n/a | signal.signal(signal.SIGHUP, self.sighup_handler) |
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| 56 | n/a | signal.signal(signal.SIGUSR1, self.sigusr1_handler) |
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| 57 | n/a | signal.signal(signal.SIGUSR2, signal.SIG_IGN) |
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| 58 | n/a | signal.signal(signal.SIGALRM, signal.default_int_handler) |
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| 59 | n/a | |
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| 60 | n/a | # Let the sub-processes know who to send signals to. |
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| 61 | n/a | pid = str(os.getpid()) |
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| 62 | n/a | |
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| 63 | n/a | with self.subprocess_send_signal(pid, "SIGHUP") as child: |
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| 64 | n/a | self.wait_signal(child, 'SIGHUP') |
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| 65 | n/a | self.assertEqual(self.got_signals, {'SIGHUP': 1, 'SIGUSR1': 0, |
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| 66 | n/a | 'SIGALRM': 0}) |
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| 67 | n/a | |
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| 68 | n/a | with self.subprocess_send_signal(pid, "SIGUSR1") as child: |
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| 69 | n/a | self.wait_signal(child, 'SIGUSR1', SIGUSR1Exception) |
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| 70 | n/a | self.assertEqual(self.got_signals, {'SIGHUP': 1, 'SIGUSR1': 1, |
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| 71 | n/a | 'SIGALRM': 0}) |
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| 72 | n/a | |
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| 73 | n/a | with self.subprocess_send_signal(pid, "SIGUSR2") as child: |
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| 74 | n/a | # Nothing should happen: SIGUSR2 is ignored |
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| 75 | n/a | child.wait() |
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| 76 | n/a | |
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| 77 | n/a | signal.alarm(1) |
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| 78 | n/a | self.wait_signal(None, 'SIGALRM', KeyboardInterrupt) |
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| 79 | n/a | self.assertEqual(self.got_signals, {'SIGHUP': 1, 'SIGUSR1': 1, |
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| 80 | n/a | 'SIGALRM': 0}) |
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| 81 | n/a | |
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| 82 | n/a | |
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| 83 | n/a | if __name__ == "__main__": |
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| 84 | n/a | unittest.main() |
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