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Current File : /proc/self/root/home/b8009/Python-3.6.3/Lib/test//signalinterproctester.py

import os
import signal
import subprocess
import sys
import time
import unittest


class SIGUSR1Exception(Exception):
    pass


class InterProcessSignalTests(unittest.TestCase):
    def setUp(self):
        self.got_signals = {'SIGHUP': 0, 'SIGUSR1': 0, 'SIGALRM': 0}

    def sighup_handler(self, signum, frame):
        self.got_signals['SIGHUP'] += 1

    def sigusr1_handler(self, signum, frame):
        self.got_signals['SIGUSR1'] += 1
        raise SIGUSR1Exception

    def wait_signal(self, child, signame, exc_class=None):
        try:
            if child is not None:
                # This wait should be interrupted by exc_class
                # (if set)
                child.wait()

            timeout = 10.0
            deadline = time.monotonic() + timeout

            while time.monotonic() < deadline:
                if self.got_signals[signame]:
                    return
                signal.pause()
        except BaseException as exc:
            if exc_class is not None and isinstance(exc, exc_class):
                # got the expected exception
                return
            raise

        self.fail('signal %s not received after %s seconds'
                  % (signame, timeout))

    def subprocess_send_signal(self, pid, signame):
        code = 'import os, signal; os.kill(%s, signal.%s)' % (pid, signame)
        args = [sys.executable, '-I', '-c', code]
        return subprocess.Popen(args)

    def test_interprocess_signal(self):
        # Install handlers. This function runs in a sub-process, so we
        # don't worry about re-setting the default handlers.
        signal.signal(signal.SIGHUP, self.sighup_handler)
        signal.signal(signal.SIGUSR1, self.sigusr1_handler)
        signal.signal(signal.SIGUSR2, signal.SIG_IGN)
        signal.signal(signal.SIGALRM, signal.default_int_handler)

        # Let the sub-processes know who to send signals to.
        pid = str(os.getpid())

        with self.subprocess_send_signal(pid, "SIGHUP") as child:
            self.wait_signal(child, 'SIGHUP')
        self.assertEqual(self.got_signals, {'SIGHUP': 1, 'SIGUSR1': 0,
                                            'SIGALRM': 0})

        with self.subprocess_send_signal(pid, "SIGUSR1") as child:
            self.wait_signal(child, 'SIGUSR1', SIGUSR1Exception)
        self.assertEqual(self.got_signals, {'SIGHUP': 1, 'SIGUSR1': 1,
                                            'SIGALRM': 0})

        with self.subprocess_send_signal(pid, "SIGUSR2") as child:
            # Nothing should happen: SIGUSR2 is ignored
            child.wait()

        signal.alarm(1)
        self.wait_signal(None, 'SIGALRM', KeyboardInterrupt)
        self.assertEqual(self.got_signals, {'SIGHUP': 1, 'SIGUSR1': 1,
                                            'SIGALRM': 0})


if __name__ == "__main__":
    unittest.main()

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