merge forward from the python 2.x branch
This commit is contained in:
Jean-Paul Calderone
parent
2aa3af4a16
commit
867c435460
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@ -13,9 +13,6 @@ rules for working with signals and their handlers:
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underlying implementation), with the exception of the handler for
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:const:`SIGCHLD`, which follows the underlying implementation.
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* There is no way to "block" signals temporarily from critical sections (since
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this is not supported by all Unix flavors).
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* Although Python signal handlers are called asynchronously as far as the Python
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user is concerned, they can only occur between the "atomic" instructions of the
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Python interpreter. This means that signals arriving during long calculations
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@ -115,6 +112,46 @@ The variables defined in the :mod:`signal` module are:
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in user and kernel space. SIGPROF is delivered upon expiration.
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.. data:: SIG_BLOCK
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A possible value for the *how* parameter to :func:`sigprocmask`
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indicating that signals are to be blocked.
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.. versionadded:: 2.7
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.. data:: SIG_UNBLOCK
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A possible value for the *how* parameter to :func:`sigprocmask`
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indicating that signals are to be unblocked.
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.. versionadded:: 2.7
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.. data:: SIG_SETMASK
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A possible value for the *how* parameter to :func:`sigprocmask`
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indicating that the signal mask is to be replaced.
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.. versionadded:: 2.7
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.. data:: SFD_CLOEXEC
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A possible flag in the *flags* parameter to :func:`signalfd` which causes
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the new file descriptor to be marked as close-on-exec.
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.. versionadded:: 2.7
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.. data:: SFD_NONBLOCK
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A possible flag in the *flags* parameter to :func:`signalfd` which causes
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the new file description to be set non-blocking.
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.. versionadded:: 2.7
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The :mod:`signal` module defines one exception:
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.. exception:: ItimerError
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@ -227,6 +264,44 @@ The :mod:`signal` module defines the following functions:
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attribute descriptions in the :mod:`inspect` module).
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.. function:: signalfd(fd, mask[, flags])
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Create a new file descriptor on which to receive signals or modify the
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mask of such a file descriptor previously created by this function.
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Availability: Linux (See the manpage :manpage:`signalfd(2)` for further
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information).
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If *fd* is ``-1``, a new file descriptor will be created. Otherwise,
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*fd* must be a file descriptor previously returned by this function.
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*mask* is a list of signal numbers which will trigger data on this file
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descriptor.
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*flags* is a bit mask which may include any :const:`signal.SFD_*` flag.
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.. versionadded:: 2.7
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.. function:: sigprocmask(how, mask)
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Set the signal mask for the process. The old signal mask is returned.
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Availability: Unix (See the Unix man page :manpage:`sigprocmask(2)` and
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:manpage:`pthread_sigmask(2)`.)
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If *how* is :const:`signal.SIG_BLOCK`, the signals in the mask are added
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to the set of blocked signals.
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If *how* is :const:`signal.SIG_UNBLOCK`, the signals in the mask are
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removed from the set of blocked signals.
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If *how* is :const:`signal.SIG_SETMASK`, the signals in the mask are set
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as blocked and the signals not in the mask are set as unblocked.
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*mask* is a list of signal numbers (eg :const:`signal.SIGUSR1`).
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.. versionadded:: 2.7
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.. _signal-example:
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Example
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@ -462,9 +462,210 @@ class ItimerTest(unittest.TestCase):
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# and the handler should have been called
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self.assertEqual(self.hndl_called, True)
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class SomeException(Exception):
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"""
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A unique exception class to be raised by a signal handler to verify that the
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signal handler was invoked.
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"""
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def raiser(*args):
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"""A signal handler which raises SomeException."""
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raise SomeException()
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class SigprocmaskTests(unittest.TestCase):
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"""Tests for sigprocmask."""
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def _handle_sigusr1(self):
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old_handler = signal.signal(signal.SIGUSR1, raiser)
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self.addCleanup(signal.signal, signal.SIGUSR1, old_handler)
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def test_signature(self):
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"""When invoked with other than two arguments, sigprocmask raises
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TypeError.
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"""
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self.assertRaises(TypeError, signal.sigprocmask)
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self.assertRaises(TypeError, signal.sigprocmask, 1)
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self.assertRaises(TypeError, signal.sigprocmask, 1, 2, 3)
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def test_invalid_how(self):
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"""If a value other than SIG_BLOCK, SIG_UNBLOCK, or SIG_SETMASK is
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passed for the how argument to sigprocmask, ValueError is raised.
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"""
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message = "value specified for how \(1700\) invalid"
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with self.assertRaisesRegexp(ValueError, message):
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signal.sigprocmask(1700, [])
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def test_invalid_signal_iterable(self):
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"""If iterating over the value passed for the signals parameter to
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sigprocmask raises an exception, sigprocmask raises that exception.
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"""
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class BrokenIter(object):
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def __iter__(self):
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raise RuntimeError("my __iter__ is broken")
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with self.assertRaisesRegexp(RuntimeError, "my __iter__ is broken"):
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signal.sigprocmask(signal.SIG_BLOCK, BrokenIter())
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def test_invalid_signal(self):
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"""If an object in the iterable passed for the signals parameter to
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sigprocmask isn't an integer, TypeError is raised."""
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with self.assertRaisesRegexp(TypeError, "an integer is required"):
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signal.sigprocmask(signal.SIG_BLOCK, [object()])
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def test_return_previous_mask(self):
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"""sigprocmask returns a list of the signals previously masked.
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"""
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previous = signal.sigprocmask(signal.SIG_BLOCK, [1, 3, 5])
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result = signal.sigprocmask(signal.SIG_BLOCK, previous)
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self.assertEquals(result, [1, 3, 5])
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def test_block(self):
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"""When invoked with SIG_BLOCK, sigprocmask blocks the signals in the
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sigmask list.
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"""
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self._handle_sigusr1()
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previous = signal.sigprocmask(signal.SIG_BLOCK, [signal.SIGUSR1])
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os.kill(os.getpid(), signal.SIGUSR1)
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with self.assertRaises(SomeException):
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# Expect to receive SIGUSR1 after unblocking it.
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signal.sigprocmask(signal.SIG_SETMASK, previous)
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def test_unblock(self):
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"""When invoked with SIG_UNBLOCK, sigprocmask unblocks the signals in
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the sigmask list.
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"""
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self._handle_sigusr1()
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previous = signal.sigprocmask(signal.SIG_BLOCK, [signal.SIGUSR1])
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self.addCleanup(signal.sigprocmask, signal.SIG_SETMASK, previous)
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signal.sigprocmask(signal.SIG_UNBLOCK, [signal.SIGUSR1])
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with self.assertRaises(SomeException):
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os.kill(os.getpid(), signal.SIGUSR1)
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def test_long_signals(self):
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"""sigprocmask accepts signal numbers as instances of long."""
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previous = signal.sigprocmask(
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signal.SIG_SETMASK, [long(signal.SIGUSR1), long(signal.SIGUSR2)])
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masked = signal.sigprocmask(signal.SIG_SETMASK, previous)
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self.assertEquals(masked, [signal.SIGUSR1, signal.SIGUSR2])
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class SignalfdTests(unittest.TestCase):
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"""
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Tests for signal.signalfd.
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"""
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def test_signature(self):
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"""When invoked with fewer than two arguments or more than three,
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signalfd raises TypeError.
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"""
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self.assertRaises(TypeError, signal.signalfd)
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self.assertRaises(TypeError, signal.signalfd, 1)
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self.assertRaises(TypeError, signal.signalfd, 1, 2, 3, 4)
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def test_create_signalfd(self):
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"""When invoked with a file descriptor of -1, signalfd allocates a new
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file descriptor for signal information delivery and returns it.
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"""
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fd = signal.signalfd(-1, [])
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self.assertTrue(isinstance(fd, int))
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os.close(fd)
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def test_non_iterable_signals(self):
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"""If an object which is not iterable is passed for the sigmask list
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argument to signalfd, the exception raised by trying to iterate over
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that object is raised.
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"""
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self.assertRaises(TypeError, signal.signalfd, -1, object())
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def test_non_integer_signals(self):
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"""If any non-integer values are included in the sigmask list argument
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to signalfd, the exception raised by the attempt to convert them to an
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integer is raised.
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"""
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self.assertRaises(TypeError, signal.signalfd, -1, [object()])
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def test_out_of_range_signal(self):
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"""If a signal number that is out of the valid range is included in the
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sigmask list argument to signalfd, ValueError is raised.
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"""
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message = "signal number -2 out of range"
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with self.assertRaisesRegexp(ValueError, message):
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signal.signalfd(-1, [-2])
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def test_handle_signals(self):
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"""After signalfd is called, if a signal is received which was in the
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sigmask list passed to that call, information about the signal can be
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read from the fd returned by that call.
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"""
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fd = signal.signalfd(-1, [signal.SIGUSR2])
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self.addCleanup(os.close, fd)
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previous = signal.sigprocmask(signal.SIG_BLOCK, [signal.SIGUSR2])
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self.addCleanup(signal.sigprocmask, signal.SIG_SETMASK, previous)
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os.kill(os.getpid(), signal.SIGUSR2)
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bytes = os.read(fd, 128)
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self.assertTrue(bytes)
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def test_close_on_exec(self):
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"""If the bit mask passed as the 3rd argument to signalfd includes
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SFD_CLOEXEC, the returned file descriptor has FD_CLOEXEC set on it.
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"""
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import fcntl
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fd = signal.signalfd(-1, [], signal.SFD_CLOEXEC)
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self.addCleanup(os.close, fd)
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flags = fcntl.fcntl(fd, fcntl.F_GETFD)
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self.assertTrue(flags & fcntl.FD_CLOEXEC)
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def test_nonblocking(self):
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"""If the bit mask passed as the 3rd argument to signalfd includes
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SFD_NOBLOCK, the file description referenced by the returned file
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descriptor has O_NONBLOCK set on it.
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"""
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import fcntl
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fd = signal.signalfd(-1, [], signal.SFD_NONBLOCK)
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self.addCleanup(os.close, fd)
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flags = fcntl.fcntl(fd, fcntl.F_GETFL)
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self.assertTrue(flags & os.O_NONBLOCK)
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def test_default_flags(self):
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"""If an empty bit mask is passed as the 3rd argument to signalfd,
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neither FD_CLOEXEC nor O_NONBLOCK is set on the resulting file
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descriptor/description.
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"""
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import fcntl
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fd = signal.signalfd(-1, [])
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self.addCleanup(os.close, fd)
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flags = fcntl.fcntl(fd, fcntl.F_GETFD)
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self.assertFalse(flags & fcntl.FD_CLOEXEC)
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flags = fcntl.fcntl(fd, fcntl.F_GETFL)
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self.assertFalse(flags & os.O_NONBLOCK)
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def test_main():
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support.run_unittest(BasicSignalTests, InterProcessSignalTests,
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WakeupSignalTests, SiginterruptTest, ItimerTest)
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support.run_unittest(
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BasicSignalTests, InterProcessSignalTests,
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WakeupSignalTests, SiginterruptTest, ItimerTest, SignalfdTests,
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SigprocmaskTests)
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if __name__ == "__main__":
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@ -1025,6 +1025,11 @@ Library
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- Issue #5949: added check for correct lineends in input from IMAP server
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in imaplib.
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- Issue #8407: The signal module gains the ``signalfd()`` and
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``sigprocmask(2)`` functions providing access to the signalfd(2) and
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sigprocmask(2) system calls respectively on Linux systems which implement
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them.
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- Add count() and reverse() methods to collections.deque().
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- Fix variations of extending deques: d.extend(d) d.extendleft(d) d+=d
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@ -22,6 +22,10 @@
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef HAVE_SIGNALFD
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#include <sys/signalfd.h>
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#endif
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#ifndef SIG_ERR
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#define SIG_ERR ((PyOS_sighandler_t)(-1))
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@ -464,6 +468,144 @@ Returns current value of given itimer.");
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#endif
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static int
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_iterable_to_mask(PyObject *iterable, sigset_t *mask)
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{
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static const char* range_format = "signal number %d out of range";
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char range_buffer[1024];
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int result = 0;
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PyObject *item, *iterator = NULL;
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sigemptyset(mask);
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iterator = PyObject_GetIter(iterable);
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if (iterator == NULL) {
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result = -1;
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goto error;
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}
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while ((item = PyIter_Next(iterator))) {
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int signum = PyInt_AsLong(item);
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Py_DECREF(item);
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if (signum == -1 && PyErr_Occurred()) {
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result = -1;
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goto error;
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}
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if (sigaddset(mask, signum) == -1) {
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PyOS_snprintf(range_buffer, sizeof(range_buffer), range_format, signum);
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PyErr_SetString(PyExc_ValueError, range_buffer);
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result = -1;
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goto error;
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}
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}
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error:
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Py_XDECREF(iterator);
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return result;
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}
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#if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
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# define PY_SIGMASK pthread_sigmask
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#elif defined(HAVE_SIGPROCMASK)
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# define PY_SIGMASK sigprocmask
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#endif
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#ifdef PY_SIGMASK
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static PyObject *
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signal_sigprocmask(PyObject *self, PyObject *args)
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{
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static const char* how_format = "value specified for how (%d) invalid";
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char how_buffer[1024];
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int how, sig;
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PyObject *signals, *result, *signum;
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sigset_t mask, previous;
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if (!PyArg_ParseTuple(args, "iO:sigprocmask", &how, &signals)) {
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return NULL;
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}
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if (_iterable_to_mask(signals, &mask) == -1) {
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return NULL;
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}
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if (PY_SIGMASK(how, &mask, &previous) != 0) {
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PyOS_snprintf(how_buffer, sizeof(how_buffer), how_format, how);
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PyErr_SetString(PyExc_ValueError, how_buffer);
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return NULL;
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}
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result = PyList_New(0);
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if (result == NULL) {
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return NULL;
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}
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for (sig = 1; sig < NSIG; ++sig) {
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if (sigismember(&previous, sig) == 1) {
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/* Handle the case where it is a member by adding the signal to
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the result list. Ignore the other cases because they mean the
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signal isn't a member of the mask or the signal was invalid,
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and an invalid signal must have been our fault in constructing
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the loop boundaries. */
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signum = PyInt_FromLong(sig);
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if (signum == NULL) {
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Py_DECREF(result);
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return NULL;
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}
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if (PyList_Append(result, signum) == -1) {
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Py_DECREF(signum);
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Py_DECREF(result);
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return NULL;
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}
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Py_DECREF(signum);
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}
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}
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return result;
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}
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PyDoc_STRVAR(sigprocmask_doc,
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"sigprocmask(how, mask) -> old mask\n\
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\n\
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Examine and change blocked signals.");
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#endif
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#ifdef HAVE_SIGNALFD
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static PyObject *
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signal_signalfd(PyObject *self, PyObject *args)
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{
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int result, flags = 0;
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sigset_t mask;
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int fd;
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PyObject *signals;
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if (!PyArg_ParseTuple(args, "iO|i:signalfd", &fd, &signals, &flags)) {
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return NULL;
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}
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if (_iterable_to_mask(signals, &mask) == -1) {
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return NULL;
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}
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|
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result = signalfd(-1, &mask, flags);
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|
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if (result == -1) {
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PyErr_SetFromErrno(PyExc_OSError);
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return NULL;
|
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}
|
||||
|
||||
return PyInt_FromLong(result);
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}
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|
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PyDoc_STRVAR(signalfd_doc,
|
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"signalfd(fd, mask, flags)\n\
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\n\
|
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Create a file descriptor for accepting signals.");
|
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|
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#endif
|
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|
||||
|
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/* List of functions defined in the module */
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||||
static PyMethodDef signal_methods[] = {
|
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#ifdef HAVE_ALARM
|
||||
|
|
@ -478,6 +620,14 @@ static PyMethodDef signal_methods[] = {
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{"signal", signal_signal, METH_VARARGS, signal_doc},
|
||||
{"getsignal", signal_getsignal, METH_VARARGS, getsignal_doc},
|
||||
{"set_wakeup_fd", signal_set_wakeup_fd, METH_VARARGS, set_wakeup_fd_doc},
|
||||
#ifdef PY_SIGMASK
|
||||
{"sigprocmask", signal_sigprocmask, METH_VARARGS, sigprocmask_doc},
|
||||
/* It's no longer needed, so clean up the namespace. */
|
||||
#undef PY_SIGMASK
|
||||
#endif
|
||||
#ifdef HAVE_SIGNALFD
|
||||
{"signalfd", signal_signalfd, METH_VARARGS, signalfd_doc},
|
||||
#endif
|
||||
#ifdef HAVE_SIGINTERRUPT
|
||||
{"siginterrupt", signal_siginterrupt, METH_VARARGS, siginterrupt_doc},
|
||||
#endif
|
||||
|
|
@ -811,6 +961,36 @@ PyInit_signal(void)
|
|||
PyDict_SetItemString(d, "ItimerError", ItimerError);
|
||||
#endif
|
||||
|
||||
#ifdef SIG_BLOCK
|
||||
x = PyLong_FromLong(SIG_BLOCK);
|
||||
PyDict_SetItemString(d, "SIG_BLOCK", x);
|
||||
Py_DECREF(x);
|
||||
#endif
|
||||
|
||||
#ifdef SIG_UNBLOCK
|
||||
x = PyLong_FromLong(SIG_UNBLOCK);
|
||||
PyDict_SetItemString(d, "SIG_UNBLOCK", x);
|
||||
Py_DECREF(x);
|
||||
#endif
|
||||
|
||||
#ifdef SIG_SETMASK
|
||||
x = PyLong_FromLong(SIG_SETMASK);
|
||||
PyDict_SetItemString(d, "SIG_SETMASK", x);
|
||||
Py_DECREF(x);
|
||||
#endif
|
||||
|
||||
#ifdef SFD_CLOEXEC
|
||||
x = PyLong_FromLong(SFD_CLOEXEC);
|
||||
PyDict_SetItemString(d, "SFD_CLOEXEC", x);
|
||||
Py_DECREF(x);
|
||||
#endif
|
||||
|
||||
#ifdef SFD_NONBLOCK
|
||||
x = PyLong_FromLong(SFD_NONBLOCK);
|
||||
PyDict_SetItemString(d, "SFD_NONBLOCK", x);
|
||||
Py_DECREF(x);
|
||||
#endif
|
||||
|
||||
#ifdef CTRL_C_EVENT
|
||||
x = PyLong_FromLong(CTRL_C_EVENT);
|
||||
PyDict_SetItemString(d, "CTRL_C_EVENT", x);
|
||||
|
|
|
|||
|
|
@ -9297,7 +9297,7 @@ for ac_func in alarm setitimer getitimer bind_textdomain_codeset chown \
|
|||
select sem_open sem_timedwait sem_getvalue sem_unlink setegid seteuid \
|
||||
setgid \
|
||||
setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setuid setvbuf \
|
||||
sigaction siginterrupt sigrelse snprintf strftime strlcpy \
|
||||
sigaction siginterrupt signalfd sigprocmask sigrelse snprintf strftime strlcpy \
|
||||
sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
|
||||
truncate uname unsetenv utimes waitpid wait3 wait4 \
|
||||
wcscoll wcsftime wcsxfrm _getpty
|
||||
|
|
|
|||
|
|
@ -2580,7 +2580,7 @@ AC_CHECK_FUNCS(alarm setitimer getitimer bind_textdomain_codeset chown \
|
|||
select sem_open sem_timedwait sem_getvalue sem_unlink setegid seteuid \
|
||||
setgid \
|
||||
setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setuid setvbuf \
|
||||
sigaction siginterrupt sigrelse snprintf strftime strlcpy \
|
||||
sigaction siginterrupt signalfd sigprocmask sigrelse snprintf strftime strlcpy \
|
||||
sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
|
||||
truncate uname unsetenv utimes waitpid wait3 wait4 \
|
||||
wcscoll wcsftime wcsxfrm _getpty)
|
||||
|
|
|
|||
|
|
@ -620,6 +620,12 @@
|
|||
/* Define to 1 if you have the <signal.h> header file. */
|
||||
#undef HAVE_SIGNAL_H
|
||||
|
||||
/* Define to 1 if you have the `signalfd' function. */
|
||||
#undef HAVE_SIGNALFD
|
||||
|
||||
/* Define to 1 if you have the `sigprocmask' function. */
|
||||
#undef HAVE_SIGPROCMASK
|
||||
|
||||
/* Define to 1 if you have the `sigrelse' function. */
|
||||
#undef HAVE_SIGRELSE
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue