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        import _testcapi
        import os
        import signal
        import struct

        signals = {!r}

        def handler(signum, frame):
            pass

        def check_signum(signals):
            data = os.read(read, len(signals)+1)
            raised = struct.unpack('%uB' % len(data), data)
            if not {!r}:
                raised = set(raised)
                signals = set(signals)
            if raised != signals:
                raise Exception("%r != %r" % (raised, signals))

        {}

        signal.signal(signal.SIGALRM, handler)
        read, write = os.pipe()
        os.set_blocking(write, False)
        signal.set_wakeup_fd(write)

        test()
        check_signum(signals)

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        import _testcapi
        import errno
        import os
        import signal
        import sys
        from test.support import captured_stderr

        def handler(signum, frame):
            1/0

        signal.signal(signal.SIGALRM, handler)
        r, w = os.pipe()
        os.set_blocking(r, False)

        # Set wakeup_fd a read-only file descriptor to trigger the error
        signal.set_wakeup_fd(r)
        try:
            with captured_stderr() as err:
                signal.raise_signal(signal.SIGALRM)
        except ZeroDivisionError:
            # An ignored exception should have been printed out on stderr
            err = err.getvalue()
            if ('Exception ignored when trying to write to the signal wakeup fd'
                not in err):
                raise AssertionError(err)
            if ('OSError: [Errno %d]' % errno.EBADF) not in err:
                raise AssertionError(err)
        else:
            raise AssertionError("ZeroDivisionError not raised")

        os.close(r)
        os.close(w)
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z)WakeupSignalTests.test_wakeup_write_errorcCs|�dtj�dS)Na�def test():
            import select
            import time

            TIMEOUT_FULL = 10
            TIMEOUT_HALF = 5

            class InterruptSelect(Exception):
                pass

            def handler(signum, frame):
                raise InterruptSelect
            signal.signal(signal.SIGALRM, handler)

            signal.alarm(1)

            # We attempt to get a signal during the sleep,
            # before select is called
            try:
                select.select([], [], [], TIMEOUT_FULL)
            except InterruptSelect:
                pass
            else:
                raise Exception("select() was not interrupted")

            before_time = time.monotonic()
            select.select([read], [], [], TIMEOUT_FULL)
            after_time = time.monotonic()
            dt = after_time - before_time
            if dt >= TIMEOUT_HALF:
                raise Exception("%s >= %s" % (dt, TIMEOUT_HALF))
        �r�r
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            import select
            import time

            TIMEOUT_FULL = 10
            TIMEOUT_HALF = 5

            class InterruptSelect(Exception):
                pass

            def handler(signum, frame):
                raise InterruptSelect
            signal.signal(signal.SIGALRM, handler)

            signal.alarm(1)
            before_time = time.monotonic()
            # We attempt to get a signal during the select call
            try:
                select.select([read], [], [], TIMEOUT_FULL)
            except InterruptSelect:
                pass
            else:
                raise Exception("select() was not interrupted")
            after_time = time.monotonic()
            dt = after_time - before_time
            if dt >= TIMEOUT_HALF:
                raise Exception("%s >= %s" % (dt, TIMEOUT_HALF))
        r�r,rrr�test_wakeup_fd_duringgs�z'WakeupSignalTests.test_wakeup_fd_duringcCs|�dtjtj�dS)Nz�def test():
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            signum1 = signal.SIGUSR1
            signum2 = signal.SIGUSR2

            signal.signal(signum1, handler)
            signal.signal(signum2, handler)

            signal.pthread_sigmask(signal.SIG_BLOCK, (signum1, signum2))
            signal.raise_signal(signum1)
            signal.raise_signal(signum2)
            # Unblocking the 2 signals calls the C signal handler twice
            signal.pthread_sigmask(signal.SIG_UNBLOCK, (signum1, signum2))
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        import signal
        import socket
        import struct
        import _testcapi

        signum = signal.SIGINT
        signals = (signum,)

        def handler(signum, frame):
            pass

        signal.signal(signum, handler)

        read, write = socket.socketpair()
        write.setblocking(False)
        signal.set_wakeup_fd(write.fileno())

        signal.raise_signal(signum)

        data = read.recv(1)
        if not data:
            raise Exception("no signum written")
        raised = struct.unpack('B', data)
        if raised != signals:
            raise Exception("%r != %r" % (raised, signals))

        read.close()
        write.close()
        rI�r�rr�rrr�test_socket�sz#WakeupSocketSignalTests.test_socketcCs.tjdkrd}nd}dj|d�}td|�dS)N�nt�sendr�a+if 1:
        import errno
        import signal
        import socket
        import sys
        import time
        import _testcapi
        from test.support import captured_stderr

        signum = signal.SIGINT

        def handler(signum, frame):
            pass

        signal.signal(signum, handler)

        read, write = socket.socketpair()
        read.setblocking(False)
        write.setblocking(False)

        signal.set_wakeup_fd(write.fileno())

        # Close sockets: send() will fail
        read.close()
        write.close()

        with captured_stderr() as err:
            signal.raise_signal(signum)

        err = err.getvalue()
        if ('Exception ignored when trying to {action} to the signal wakeup fd'
            not in err):
            raise AssertionError(err)
        ��actionrI�r7rr�r�rr�r�rrr�test_send_error�s
!�"z'WakeupSocketSignalTests.test_send_errorcCs.tjdkrd}nd}dj|d�}td|�dS)Nr�r�r�a�if 1:
        import errno
        import signal
        import socket
        import sys
        import time
        import _testcapi
        from test.support import captured_stderr

        signum = signal.SIGINT

        # This handler will be called, but we intentionally won't read from
        # the wakeup fd.
        def handler(signum, frame):
            pass

        signal.signal(signum, handler)

        read, write = socket.socketpair()

        # Fill the socketpair buffer
        if sys.platform == 'win32':
            # bpo-34130: On Windows, sometimes non-blocking send fails to fill
            # the full socketpair buffer, so use a timeout of 50 ms instead.
            write.settimeout(0.050)
        else:
            write.setblocking(False)

        # Start with large chunk size to reduce the
        # number of send needed to fill the buffer.
        written = 0
        for chunk_size in (2 ** 16, 2 ** 8, 1):
            chunk = b"x" * chunk_size
            try:
                while True:
                    write.send(chunk)
                    written += chunk_size
            except (BlockingIOError, socket.timeout):
                pass

        print(f"%s bytes written into the socketpair" % written, flush=True)

        write.setblocking(False)
        try:
            write.send(b"x")
        except BlockingIOError:
            # The socketpair buffer seems full
            pass
        else:
            raise AssertionError("%s bytes failed to fill the socketpair "
                                 "buffer" % written)

        # By default, we get a warning when a signal arrives
        msg = ('Exception ignored when trying to {action} '
               'to the signal wakeup fd')
        signal.set_wakeup_fd(write.fileno())

        with captured_stderr() as err:
            signal.raise_signal(signum)

        err = err.getvalue()
        if msg not in err:
            raise AssertionError("first set_wakeup_fd() test failed, "
                                 "stderr: %r" % err)

        # And also if warn_on_full_buffer=True
        signal.set_wakeup_fd(write.fileno(), warn_on_full_buffer=True)

        with captured_stderr() as err:
            signal.raise_signal(signum)

        err = err.getvalue()
        if msg not in err:
            raise AssertionError("set_wakeup_fd(warn_on_full_buffer=True) "
                                 "test failed, stderr: %r" % err)

        # But not if warn_on_full_buffer=False
        signal.set_wakeup_fd(write.fileno(), warn_on_full_buffer=False)

        with captured_stderr() as err:
            signal.raise_signal(signum)

        err = err.getvalue()
        if err != "":
            raise AssertionError("set_wakeup_fd(warn_on_full_buffer=False) "
                                 "test failed, stderr: %r" % err)

        # And then check the default again, to make sure warn_on_full_buffer
        # settings don't leak across calls.
        signal.set_wakeup_fd(write.fileno())

        with captured_stderr() as err:
            signal.raise_signal(signum)

        err = err.getvalue()
        if msg not in err:
            raise AssertionError("second set_wakeup_fd() test failed, "
                                 "stderr: %r" % err)

        r�rIr�r�rrr�test_warn_on_full_buffer�s
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�SiginterruptTestc	Cs�d|f}td|���}z |j��}|jtjd�\}}Wn*tjy`|��YWd�dS0||}|�	�}|dvr�t
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            import errno
            import os
            import signal
            import sys

            interrupt = %r
            r, w = os.pipe()

            def handler(signum, frame):
                1 / 0

            signal.signal(signal.SIGALRM, handler)
            if interrupt is not None:
                signal.siginterrupt(signal.SIGALRM, interrupt)

            print("ready")
            sys.stdout.flush()

            # run the test twice
            try:
                for loop in range(2):
                    # send a SIGALRM in a second (during the read)
                    signal.alarm(1)
                    try:
                        # blocking call: read from a pipe without data
                        os.read(r, 1)
                    except ZeroDivisionError:
                        pass
                    else:
                        sys.exit(2)
                sys.exit(3)
            finally:
                os.close(r)
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�d�d*d+��Zd,S)-�PendingSignalsTestsz[
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if 1:
            import os
            import signal

            def handler(signum, frame):
                1/0

            signum = signal.SIGUSR1
            signal.signal(signum, handler)

            signal.pthread_sigmask(signal.SIG_BLOCK, [signum])
            os.kill(os.getpid(), signum)
            pending = signal.sigpending()
            for sig in pending:
                assert isinstance(sig, signal.Signals), repr(pending)
            if pending != {signum}:
                raise Exception('%s != {%s}' % (pending, signum))
            try:
                signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
            except ZeroDivisionError:
                pass
            else:
                raise Exception("ZeroDivisionError not raised")
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            import threading
            import sys

            signum = signal.SIGUSR1

            def handler(signum, frame):
                1/0

            signal.signal(signum, handler)

            tid = threading.get_ident()
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        import sys
        from signal import Signals

        def handler(signum, frame):
            1/0

        %s

        blocked = %s
        signum = signal.SIGALRM

        # child: block and wait the signal
        try:
            signal.signal(signum, handler)
            signal.pthread_sigmask(signal.SIG_BLOCK, [blocked])

            # Do the tests
            test(signum)

            # The handler must not be called on unblock
            try:
                signal.pthread_sigmask(signal.SIG_UNBLOCK, [blocked])
            except ZeroDivisionError:
                print("the signal handler has been called",
                      file=sys.stderr)
                sys.exit(1)
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            signum = signal.SIGUSR1

            def kill_later():
                # wait until the main thread is waiting in sigwait()
                time.sleep(1)
                os.kill(os.getpid(), signum)

            # the signal must be blocked by all the threads
            signal.pthread_sigmask(signal.SIG_BLOCK, [signum])
            killer = threading.Thread(target=kill_later)
            killer.start()
            received = signal.sigwait([signum])
            if received != signum:
                print("sigwait() received %s, not %s" % (received, signum),
                      file=sys.stderr)
                sys.exit(1)
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        def handler(signum, frame):
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        def kill(signum):
            os.kill(os.getpid(), signum)

        def check_mask(mask):
            for sig in mask:
                assert isinstance(sig, signal.Signals), repr(sig)

        def read_sigmask():
            sigmask = signal.pthread_sigmask(signal.SIG_BLOCK, [])
            check_mask(sigmask)
            return sigmask

        signum = signal.SIGUSR1

        # Install our signal handler
        old_handler = signal.signal(signum, handler)

        # Unblock SIGUSR1 (and copy the old mask) to test our signal handler
        old_mask = signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
        check_mask(old_mask)
        try:
            kill(signum)
        except ZeroDivisionError:
            pass
        else:
            raise Exception("ZeroDivisionError not raised")

        # Block and then raise SIGUSR1. The signal is blocked: the signal
        # handler is not called, and the signal is now pending
        mask = signal.pthread_sigmask(signal.SIG_BLOCK, [signum])
        check_mask(mask)
        kill(signum)

        # Check the new mask
        blocked = read_sigmask()
        check_mask(blocked)
        if signum not in blocked:
            raise Exception("%s not in %s" % (signum, blocked))
        if old_mask ^ blocked != {signum}:
            raise Exception("%s ^ %s != {%s}" % (old_mask, blocked, signum))

        # Unblock SIGUSR1
        try:
            # unblock the pending signal calls immediately the signal handler
            signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum])
        except ZeroDivisionError:
            pass
        else:
            raise Exception("ZeroDivisionError not raised")
        try:
            kill(signum)
        except ZeroDivisionError:
            pass
        else:
            raise Exception("ZeroDivisionError not raised")

        # Check the new mask
        unblocked = read_sigmask()
        if signum in unblocked:
            raise Exception("%s in %s" % (signum, unblocked))
        if blocked ^ unblocked != {signum}:
            raise Exception("%s ^ %s != {%s}" % (blocked, unblocked, signum))
        if old_mask != unblocked:
            raise Exception("%s != %s" % (old_mask, unblocked))
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            import signal
            import sys

            def handler(signum, frame):
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