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python3-doc.11599
bpo23395-PyErr_SetInterrupt-signal.patch
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File bpo23395-PyErr_SetInterrupt-signal.patch of Package python3-doc.11599
From d823eee619c0e7c1a9bc5b0caa0d0fa4734ac052 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Mat=C4=9Bj=20Cepl?= <mcepl@cepl.eu> Date: Thu, 23 May 2019 22:30:00 +0200 Subject: [PATCH] bpo-23395: Fix PyErr_SetInterrupt if the SIGINT signal is ignored or not handled (GH-7778) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit ``_thread.interrupt_main()`` now avoids setting the Python error status if the ``SIGINT`` signal is ignored or not handled by Python. (cherry picked from commit 608876b6b1eb59538e6c29671a733033fb8b5be7) Co-authored-by: Matěj Cepl <mcepl@cepl.eu> --- Doc/c-api/exceptions.rst | 12 +++---- Doc/library/_thread.rst | 8 +++-- Lib/test/test_threading.py | 35 +++++++++++++++++++ Misc/ACKS | 2 +- .../2016-07-27-11-06-43.bpo-23395.MuCEX9.rst | 2 ++ Modules/signalmodule.c | 13 ++++--- 6 files changed, 59 insertions(+), 13 deletions(-) create mode 100644 Misc/NEWS.d/next/Library/2016-07-27-11-06-43.bpo-23395.MuCEX9.rst diff --git a/Doc/c-api/exceptions.rst b/Doc/c-api/exceptions.rst index 79e6f97a44c7..13e00b544818 100644 --- a/Doc/c-api/exceptions.rst +++ b/Doc/c-api/exceptions.rst @@ -516,13 +516,13 @@ Signal Handling single: SIGINT single: KeyboardInterrupt (built-in exception) - This function simulates the effect of a :const:`SIGINT` signal arriving --- the - next time :c:func:`PyErr_CheckSignals` is called, :exc:`KeyboardInterrupt` will - be raised. It may be called without holding the interpreter lock. - - .. % XXX This was described as obsolete, but is used in - .. % _thread.interrupt_main() (used from IDLE), so it's still needed. + Simulate the effect of a :const:`SIGINT` signal arriving. The next time + :c:func:`PyErr_CheckSignals` is called, the Python signal handler for + :const:`SIGINT` will be called. + If :const:`SIGINT` isn't handled by Python (it was set to + :data:`signal.SIG_DFL` or :data:`signal.SIG_IGN`), this function does + nothing. .. c:function:: int PySignal_SetWakeupFd(int fd) diff --git a/Doc/library/_thread.rst b/Doc/library/_thread.rst index acffabf24bad..d1c28f479e94 100644 --- a/Doc/library/_thread.rst +++ b/Doc/library/_thread.rst @@ -53,8 +53,12 @@ This module defines the following constants and functions: .. function:: interrupt_main() - Raise a :exc:`KeyboardInterrupt` exception in the main thread. A subthread can - use this function to interrupt the main thread. + Simulate the effect of a :data:`signal.SIGINT` signal arriving in the main + thread. A thread can use this function to interrupt the main thread. + + If :data:`signal.SIGINT` isn't handled by Python (it was set to + :data:`signal.SIG_DFL` or :data:`signal.SIG_IGN`), this function does + nothing. .. function:: exit() diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py index 27f328dbe63c..aa810bda1c2a 100644 --- a/Lib/test/test_threading.py +++ b/Lib/test/test_threading.py @@ -16,6 +16,7 @@ import weakref import os import subprocess +import signal from test import lock_tests from test import support @@ -1165,6 +1166,7 @@ class BoundedSemaphoreTests(lock_tests.BoundedSemaphoreTests): class BarrierTests(lock_tests.BarrierTests): barriertype = staticmethod(threading.Barrier) + class MiscTestCase(unittest.TestCase): def test__all__(self): extra = {"ThreadError"} @@ -1172,5 +1174,38 @@ def test__all__(self): support.check__all__(self, threading, ('threading', '_thread'), extra=extra, blacklist=blacklist) + +class InterruptMainTests(unittest.TestCase): + def test_interrupt_main_subthread(self): + # Calling start_new_thread with a function that executes interrupt_main + # should raise KeyboardInterrupt upon completion. + def call_interrupt(): + _thread.interrupt_main() + t = threading.Thread(target=call_interrupt) + with self.assertRaises(KeyboardInterrupt): + t.start() + t.join() + t.join() + + def test_interrupt_main_mainthread(self): + # Make sure that if interrupt_main is called in main thread that + # KeyboardInterrupt is raised instantly. + with self.assertRaises(KeyboardInterrupt): + _thread.interrupt_main() + + def test_interrupt_main_noerror(self): + handler = signal.getsignal(signal.SIGINT) + try: + # No exception should arise. + signal.signal(signal.SIGINT, signal.SIG_IGN) + _thread.interrupt_main() + + signal.signal(signal.SIGINT, signal.SIG_DFL) + _thread.interrupt_main() + finally: + # Restore original handler + signal.signal(signal.SIGINT, handler) + + if __name__ == "__main__": unittest.main() diff --git a/Misc/ACKS b/Misc/ACKS index 6664f711f63e..40e799088645 100644 --- a/Misc/ACKS +++ b/Misc/ACKS @@ -257,7 +257,7 @@ Donn Cave Charles Cazabon Jesús Cea Avión Per Cederqvist -Matej Cepl +Matěj Cepl Carl Cerecke Octavian Cerna Michael Cetrulo diff --git a/Misc/NEWS.d/next/Library/2016-07-27-11-06-43.bpo-23395.MuCEX9.rst b/Misc/NEWS.d/next/Library/2016-07-27-11-06-43.bpo-23395.MuCEX9.rst new file mode 100644 index 000000000000..ec95320ab411 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2016-07-27-11-06-43.bpo-23395.MuCEX9.rst @@ -0,0 +1,2 @@ +``_thread.interrupt_main()`` now avoids setting the Python error status +if the ``SIGINT`` signal is ignored or not handled by Python. diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c index e70c6fc3969a..a0722b731c87 100644 --- a/Modules/signalmodule.c +++ b/Modules/signalmodule.c @@ -1562,13 +1562,18 @@ PyErr_CheckSignals(void) } -/* Replacements for intrcheck.c functionality - * Declared in pyerrors.h - */ +/* Simulate the effect of a signal.SIGINT signal arriving. The next time + PyErr_CheckSignals is called, the Python SIGINT signal handler will be + raised. + + Missing signal handler for the SIGINT signal is silently ignored. */ void PyErr_SetInterrupt(void) { - trip_signal(SIGINT); + if ((Handlers[SIGINT].func != IgnoreHandler) && + (Handlers[SIGINT].func != DefaultHandler)) { + trip_signal(SIGINT); + } } void
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