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bpo-33332: Add signal.valid_signals() (GH-6581)

This commit is contained in:
Antoine Pitrou 2018-05-04 13:00:50 +02:00 committed by GitHub
parent 491bbedc20
commit 9d3627e311
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GPG Key ID: 4AEE18F83AFDEB23
14 changed files with 171 additions and 26 deletions
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13
Doc/library/signal.rst
View File

@ -216,6 +216,15 @@ The :mod:`signal` module defines the following functions:
.. versionadded:: 3.8
.. function:: valid_signals()
Return the set of valid signal numbers on this platform. This can be
less than ``range(1, NSIG)`` if some signals are reserved by the system
for internal use.
.. versionadded:: 3.8
.. function:: pause()
Cause the process to sleep until a signal is received; the appropriate handler
@ -268,8 +277,8 @@ The :mod:`signal` module defines the following functions:
argument.
*mask* is a set of signal numbers (e.g. {:const:`signal.SIGINT`,
:const:`signal.SIGTERM`}). Use ``range(1, signal.NSIG)`` for a full mask
including all signals.
:const:`signal.SIGTERM`}). Use :func:`~signal.valid_signals` for a full
mask including all signals.
For example, ``signal.pthread_sigmask(signal.SIG_BLOCK, [])`` reads the
signal mask of the calling thread.

4
Lib/asyncio/unix_events.py
View File

@ -167,8 +167,8 @@ class _UnixSelectorEventLoop(selector_events.BaseSelectorEventLoop):
if not isinstance(sig, int):
raise TypeError(f'sig must be an int, not {sig!r}')
if not (1 <= sig < signal.NSIG):
raise ValueError(f'sig {sig} out of range(1, {signal.NSIG})')
if sig not in signal.valid_signals():
raise ValueError(f'invalid signal number {sig}')
def _make_read_pipe_transport(self, pipe, protocol, waiter=None,
extra=None):

2
Lib/multiprocessing/resource_sharer.py
View File

@ -136,7 +136,7 @@ class _ResourceSharer(object):
def _serve(self):
if hasattr(signal, 'pthread_sigmask'):
signal.pthread_sigmask(signal.SIG_BLOCK, range(1, signal.NSIG))
signal.pthread_sigmask(signal.SIG_BLOCK, signal.valid_signals())
while 1:
try:
with self._listener.accept() as conn:

10
Lib/signal.py
View File

@ -65,8 +65,7 @@ if 'pthread_sigmask' in _globals:
if 'sigpending' in _globals:
@_wraps(_signal.sigpending)
def sigpending():
sigs = _signal.sigpending()
return set(_int_to_enum(x, Signals) for x in sigs)
return {_int_to_enum(x, Signals) for x in _signal.sigpending()}
if 'sigwait' in _globals:
@ -76,4 +75,11 @@ if 'sigwait' in _globals:
return _int_to_enum(retsig, Signals)
sigwait.__doc__ = _signal.sigwait
if 'valid_signals' in _globals:
@_wraps(_signal.valid_signals)
def valid_signals():
return {_int_to_enum(x, Signals) for x in _signal.valid_signals()}
del _globals, _wraps

2
Lib/test/support/__init__.py
View File

@ -2810,7 +2810,7 @@ class SaveSignals:
def __init__(self):
import signal
self.signal = signal
self.signals = list(range(1, signal.NSIG))
self.signals = signal.valid_signals()
# SIGKILL and SIGSTOP signals cannot be ignored nor caught
for signame in ('SIGKILL', 'SIGSTOP'):
try:

12
Lib/test/test_asyncio/test_unix_events.py
View File

@ -69,6 +69,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
@mock.patch('asyncio.unix_events.signal')
def test_add_signal_handler_setup_error(self, m_signal):
m_signal.NSIG = signal.NSIG
m_signal.valid_signals = signal.valid_signals
m_signal.set_wakeup_fd.side_effect = ValueError
self.assertRaises(
@ -96,6 +97,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
@mock.patch('asyncio.unix_events.signal')
def test_add_signal_handler(self, m_signal):
m_signal.NSIG = signal.NSIG
m_signal.valid_signals = signal.valid_signals
cb = lambda: True
self.loop.add_signal_handler(signal.SIGHUP, cb)
@ -106,6 +108,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
@mock.patch('asyncio.unix_events.signal')
def test_add_signal_handler_install_error(self, m_signal):
m_signal.NSIG = signal.NSIG
m_signal.valid_signals = signal.valid_signals
def set_wakeup_fd(fd):
if fd == -1:
@ -125,6 +128,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
@mock.patch('asyncio.base_events.logger')
def test_add_signal_handler_install_error2(self, m_logging, m_signal):
m_signal.NSIG = signal.NSIG
m_signal.valid_signals = signal.valid_signals
class Err(OSError):
errno = errno.EINVAL
@ -145,6 +149,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
errno = errno.EINVAL
m_signal.signal.side_effect = Err
m_signal.NSIG = signal.NSIG
m_signal.valid_signals = signal.valid_signals
self.assertRaises(
RuntimeError,
@ -156,6 +161,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
@mock.patch('asyncio.unix_events.signal')
def test_remove_signal_handler(self, m_signal):
m_signal.NSIG = signal.NSIG
m_signal.valid_signals = signal.valid_signals
self.loop.add_signal_handler(signal.SIGHUP, lambda: True)
@ -170,6 +176,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
def test_remove_signal_handler_2(self, m_signal):
m_signal.NSIG = signal.NSIG
m_signal.SIGINT = signal.SIGINT
m_signal.valid_signals = signal.valid_signals
self.loop.add_signal_handler(signal.SIGINT, lambda: True)
self.loop._signal_handlers[signal.SIGHUP] = object()
@ -187,6 +194,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
@mock.patch('asyncio.base_events.logger')
def test_remove_signal_handler_cleanup_error(self, m_logging, m_signal):
m_signal.NSIG = signal.NSIG
m_signal.valid_signals = signal.valid_signals
self.loop.add_signal_handler(signal.SIGHUP, lambda: True)
m_signal.set_wakeup_fd.side_effect = ValueError
@ -197,6 +205,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
@mock.patch('asyncio.unix_events.signal')
def test_remove_signal_handler_error(self, m_signal):
m_signal.NSIG = signal.NSIG
m_signal.valid_signals = signal.valid_signals
self.loop.add_signal_handler(signal.SIGHUP, lambda: True)
m_signal.signal.side_effect = OSError
@ -207,6 +216,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
@mock.patch('asyncio.unix_events.signal')
def test_remove_signal_handler_error2(self, m_signal):
m_signal.NSIG = signal.NSIG
m_signal.valid_signals = signal.valid_signals
self.loop.add_signal_handler(signal.SIGHUP, lambda: True)
class Err(OSError):
@ -219,6 +229,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
@mock.patch('asyncio.unix_events.signal')
def test_close(self, m_signal):
m_signal.NSIG = signal.NSIG
m_signal.valid_signals = signal.valid_signals
self.loop.add_signal_handler(signal.SIGHUP, lambda: True)
self.loop.add_signal_handler(signal.SIGCHLD, lambda: True)
@ -236,6 +247,7 @@ class SelectorEventLoopSignalTests(test_utils.TestCase):
@mock.patch('asyncio.unix_events.signal')
def test_close_on_finalizing(self, m_signal, m_sys):
m_signal.NSIG = signal.NSIG
m_signal.valid_signals = signal.valid_signals
self.loop.add_signal_handler(signal.SIGHUP, lambda: True)
self.assertEqual(len(self.loop._signal_handlers), 1)

30
Lib/test/test_signal.py
View File

@ -67,9 +67,28 @@ class PosixTests(unittest.TestCase):
script = os.path.join(dirname, 'signalinterproctester.py')
assert_python_ok(script)
def test_valid_signals(self):
s = signal.valid_signals()
self.assertIsInstance(s, set)
self.assertIn(signal.Signals.SIGINT, s)
self.assertIn(signal.Signals.SIGALRM, s)
self.assertNotIn(0, s)
self.assertNotIn(signal.NSIG, s)
self.assertLess(len(s), signal.NSIG)
@unittest.skipUnless(sys.platform == "win32", "Windows specific")
class WindowsSignalTests(unittest.TestCase):
def test_valid_signals(self):
s = signal.valid_signals()
self.assertIsInstance(s, set)
self.assertGreaterEqual(len(s), 6)
self.assertIn(signal.Signals.SIGINT, s)
self.assertNotIn(0, s)
self.assertNotIn(signal.NSIG, s)
self.assertLess(len(s), signal.NSIG)
def test_issue9324(self):
# Updated for issue #10003, adding SIGBREAK
handler = lambda x, y: None
@ -922,6 +941,17 @@ class PendingSignalsTests(unittest.TestCase):
self.assertRaises(TypeError, signal.pthread_sigmask, 1)
self.assertRaises(TypeError, signal.pthread_sigmask, 1, 2, 3)
self.assertRaises(OSError, signal.pthread_sigmask, 1700, [])
with self.assertRaises(ValueError):
signal.pthread_sigmask(signal.SIG_BLOCK, [signal.NSIG])
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
'need signal.pthread_sigmask()')
def test_pthread_sigmask_valid_signals(self):
s = signal.pthread_sigmask(signal.SIG_BLOCK, signal.valid_signals())
self.addCleanup(signal.pthread_sigmask, signal.SIG_SETMASK, s)
# Get current blocked set
s = signal.pthread_sigmask(signal.SIG_UNBLOCK, signal.valid_signals())
self.assertLessEqual(s, signal.valid_signals())
@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
'need signal.pthread_sigmask()')

2
Misc/NEWS.d/next/Library/2018-04-23-21-41-30.bpo-33332.Y6OZ8Z.rst Normal file
View File

@ -0,0 +1,2 @@
Add ``signal.valid_signals()`` to expose the POSIX sigfillset()
functionality.

31
Modules/clinic/signalmodule.c.h
View File

@ -341,6 +341,31 @@ PyDoc_STRVAR(signal_sigwait__doc__,
#endif /* defined(HAVE_SIGWAIT) */
#if (defined(HAVE_SIGFILLSET) || defined(MS_WINDOWS))
PyDoc_STRVAR(signal_valid_signals__doc__,
"valid_signals($module, /)\n"
"--\n"
"\n"
"Return a set of valid signal numbers on this platform.\n"
"\n"
"The signal numbers returned by this function can be safely passed to\n"
"functions like `pthread_sigmask`.");
#define SIGNAL_VALID_SIGNALS_METHODDEF \
{"valid_signals", (PyCFunction)signal_valid_signals, METH_NOARGS, signal_valid_signals__doc__},
static PyObject *
signal_valid_signals_impl(PyObject *module);
static PyObject *
signal_valid_signals(PyObject *module, PyObject *Py_UNUSED(ignored))
{
return signal_valid_signals_impl(module);
}
#endif /* (defined(HAVE_SIGFILLSET) || defined(MS_WINDOWS)) */
#if defined(HAVE_SIGWAITINFO)
PyDoc_STRVAR(signal_sigwaitinfo__doc__,
@ -459,6 +484,10 @@ exit:
#define SIGNAL_SIGWAIT_METHODDEF
#endif /* !defined(SIGNAL_SIGWAIT_METHODDEF) */
#ifndef SIGNAL_VALID_SIGNALS_METHODDEF
#define SIGNAL_VALID_SIGNALS_METHODDEF
#endif /* !defined(SIGNAL_VALID_SIGNALS_METHODDEF) */
#ifndef SIGNAL_SIGWAITINFO_METHODDEF
#define SIGNAL_SIGWAITINFO_METHODDEF
#endif /* !defined(SIGNAL_SIGWAITINFO_METHODDEF) */
@ -470,4 +499,4 @@ exit:
#ifndef SIGNAL_PTHREAD_KILL_METHODDEF
#define SIGNAL_PTHREAD_KILL_METHODDEF
#endif /* !defined(SIGNAL_PTHREAD_KILL_METHODDEF) */
/*[clinic end generated code: output=7b41486acf93aa8e input=a9049054013a1b77]*/
/*[clinic end generated code: output=f35d79e0cfee3f1b input=a9049054013a1b77]*/

64
Modules/signalmodule.c
View File

@ -841,11 +841,21 @@ iterable_to_sigset(PyObject *iterable, sigset_t *mask)
if (signum == -1 && PyErr_Occurred())
goto error;
if (0 < signum && signum < NSIG) {
/* bpo-33329: ignore sigaddset() return value as it can fail
* for some reserved signals, but we want the `range(1, NSIG)`
* idiom to allow selecting all valid signals.
*/
(void) sigaddset(mask, (int)signum);
if (sigaddset(mask, (int)signum)) {
if (errno != EINVAL) {
/* Probably impossible */
PyErr_SetFromErrno(PyExc_OSError);
goto error;
}
/* For backwards compatibility, allow idioms such as
* `range(1, NSIG)` but warn about invalid signal numbers
*/
const char *msg =
"invalid signal number %ld, please use valid_signals()";
if (PyErr_WarnFormat(PyExc_RuntimeWarning, 1, msg, signum)) {
goto error;
}
}
}
else {
PyErr_Format(PyExc_ValueError,
@ -1001,6 +1011,47 @@ signal_sigwait(PyObject *module, PyObject *sigset)
#endif /* #ifdef HAVE_SIGWAIT */
#if defined(HAVE_SIGFILLSET) || defined(MS_WINDOWS)
/*[clinic input]
signal.valid_signals
Return a set of valid signal numbers on this platform.
The signal numbers returned by this function can be safely passed to
functions like `pthread_sigmask`.
[clinic start generated code]*/
static PyObject *
signal_valid_signals_impl(PyObject *module)
/*[clinic end generated code: output=1609cffbcfcf1314 input=86a3717ff25288f2]*/
{
#ifdef MS_WINDOWS
#ifdef SIGBREAK
PyObject *tup = Py_BuildValue("(iiiiiii)", SIGABRT, SIGBREAK, SIGFPE,
SIGILL, SIGINT, SIGSEGV, SIGTERM);
#else
PyObject *tup = Py_BuildValue("(iiiiii)", SIGABRT, SIGFPE, SIGILL,
SIGINT, SIGSEGV, SIGTERM);
#endif
if (tup == NULL) {
return NULL;
}
PyObject *set = PySet_New(tup);
Py_DECREF(tup);
return set;
#else
sigset_t mask;
if (sigemptyset(&mask) || sigfillset(&mask)) {
return PyErr_SetFromErrno(PyExc_OSError);
}
return sigset_to_set(mask);
#endif
}
#endif /* #if defined(HAVE_SIGFILLSET) || defined(MS_WINDOWS) */
#if defined(HAVE_SIGWAITINFO) || defined(HAVE_SIGTIMEDWAIT)
static int initialized;
static PyStructSequence_Field struct_siginfo_fields[] = {
@ -1225,6 +1276,9 @@ static PyMethodDef signal_methods[] = {
SIGNAL_SIGWAIT_METHODDEF
SIGNAL_SIGWAITINFO_METHODDEF
SIGNAL_SIGTIMEDWAIT_METHODDEF
#if defined(HAVE_SIGFILLSET) || defined(MS_WINDOWS)
SIGNAL_VALID_SIGNALS_METHODDEF
#endif
{NULL, NULL} /* sentinel */
};

18
aclocal.m4 vendored
View File

@ -1,6 +1,6 @@
# generated automatically by aclocal 1.15.1 -*- Autoconf -*-
# generated automatically by aclocal 1.15 -*- Autoconf -*-
# Copyright (C) 1996-2017 Free Software Foundation, Inc.
# Copyright (C) 1996-2014 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
@ -12,9 +12,9 @@
# PARTICULAR PURPOSE.
m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
# pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*-
# serial 12 (pkg-config-0.29.2)
dnl pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*-
dnl serial 11 (pkg-config-0.29.1)
dnl
dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
dnl
@ -55,7 +55,7 @@ dnl
dnl See the "Since" comment for each macro you use to see what version
dnl of the macros you require.
m4_defun([PKG_PREREQ],
[m4_define([PKG_MACROS_VERSION], [0.29.2])
[m4_define([PKG_MACROS_VERSION], [0.29.1])
m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
[m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
])dnl PKG_PREREQ
@ -156,7 +156,7 @@ AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
pkg_failed=no
AC_MSG_CHECKING([for $2])
AC_MSG_CHECKING([for $1])
_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
_PKG_CONFIG([$1][_LIBS], [libs], [$2])
@ -166,7 +166,7 @@ and $1[]_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.])
if test $pkg_failed = yes; then
AC_MSG_RESULT([no])
AC_MSG_RESULT([no])
_PKG_SHORT_ERRORS_SUPPORTED
if test $_pkg_short_errors_supported = yes; then
$1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
@ -187,7 +187,7 @@ installed software in a non-standard prefix.
_PKG_TEXT])[]dnl
])
elif test $pkg_failed = untried; then
AC_MSG_RESULT([no])
AC_MSG_RESULT([no])
m4_default([$4], [AC_MSG_FAILURE(
[The pkg-config script could not be found or is too old. Make sure it
is in your PATH or set the PKG_CONFIG environment variable to the full

2
configure vendored
View File

@ -11259,7 +11259,7 @@ for ac_func in alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setpriority setuid setvbuf \
sched_get_priority_max sched_setaffinity sched_setscheduler sched_setparam \
sched_rr_get_interval \
sigaction sigaltstack siginterrupt sigpending sigrelse \
sigaction sigaltstack sigfillset siginterrupt sigpending sigrelse \
sigtimedwait sigwait sigwaitinfo snprintf strftime strlcpy symlinkat sync \
sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
truncate uname unlinkat unsetenv utimensat utimes waitid waitpid wait3 wait4 \

2
configure.ac
View File

@ -3474,7 +3474,7 @@ AC_CHECK_FUNCS(alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setpriority setuid setvbuf \
sched_get_priority_max sched_setaffinity sched_setscheduler sched_setparam \
sched_rr_get_interval \
sigaction sigaltstack siginterrupt sigpending sigrelse \
sigaction sigaltstack sigfillset siginterrupt sigpending sigrelse \
sigtimedwait sigwait sigwaitinfo snprintf strftime strlcpy symlinkat sync \
sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
truncate uname unlinkat unsetenv utimensat utimes waitid waitpid wait3 wait4 \

3
pyconfig.h.in
View File

@ -896,6 +896,9 @@
/* Define to 1 if you have the `sigaltstack' function. */
#undef HAVE_SIGALTSTACK
/* Define to 1 if you have the `sigfillset' function. */
#undef HAVE_SIGFILLSET
/* Define to 1 if `si_band' is a member of `siginfo_t'. */
#undef HAVE_SIGINFO_T_SI_BAND