cpython/Lib/test/test_signal.py at ff295ab52e548472f76322a5dc1ef347b870e67b · ethanfurman/cpython

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import enum

import errno

import os

import random

import signal

import socket

import statistics

import subprocess

import sys

import threading

import time

import unittest

from test import support

from test.support import os_helper

from test.support.script_helper import assert_python_ok, spawn_python

try:

import _testcapi

except ImportError:

_testcapi = None

class GenericTests(unittest.TestCase):

def test_enums(self):

for name in dir(signal):

sig = getattr(signal, name)

if name in {'SIG_DFL', 'SIG_IGN'}:

self.assertIsInstance(sig, signal.Handlers)

elif name in {'SIG_BLOCK', 'SIG_UNBLOCK', 'SIG_SETMASK'}:

self.assertIsInstance(sig, signal.Sigmasks)

elif name.startswith('SIG') and not name.startswith('SIG_'):

self.assertIsInstance(sig, signal.Signals)

elif name.startswith('CTRL_'):

self.assertIsInstance(sig, signal.Signals)

self.assertEqual(sys.platform, "win32")

CheckedSignals = enum._old_convert_(

enum.IntEnum, 'Signals', 'signal',

lambda name:

name.isupper()

and (name.startswith('SIG') and not name.startswith('SIG_'))

or name.startswith('CTRL_'),

source=signal,

)

enum._test_simple_enum(CheckedSignals, signal.Signals)

CheckedHandlers = enum._old_convert_(

enum.IntEnum, 'Handlers', 'signal',

lambda name: name in ('SIG_DFL', 'SIG_IGN'),

source=signal,

)

enum._test_simple_enum(CheckedHandlers, signal.Handlers)

Sigmasks = getattr(signal, 'Sigmasks', None)

if Sigmasks is not None:

CheckedSigmasks = enum._old_convert_(

enum.IntEnum, 'Sigmasks', 'signal',

lambda name: name in ('SIG_BLOCK', 'SIG_UNBLOCK', 'SIG_SETMASK'),

source=signal,

)

enum._test_simple_enum(CheckedSigmasks, Sigmasks)

@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")

class PosixTests(unittest.TestCase):

def trivial_signal_handler(self, *args):

pass

def test_out_of_range_signal_number_raises_error(self):

self.assertRaises(ValueError, signal.getsignal, 4242)

self.assertRaises(ValueError, signal.signal, 4242,

self.trivial_signal_handler)

self.assertRaises(ValueError, signal.strsignal, 4242)

def test_setting_signal_handler_to_none_raises_error(self):

self.assertRaises(TypeError, signal.signal,

signal.SIGUSR1, None)

def test_getsignal(self):

hup = signal.signal(signal.SIGHUP, self.trivial_signal_handler)

self.assertIsInstance(hup, signal.Handlers)

self.assertEqual(signal.getsignal(signal.SIGHUP),

self.trivial_signal_handler)

signal.signal(signal.SIGHUP, hup)

self.assertEqual(signal.getsignal(signal.SIGHUP), hup)

def test_strsignal(self):

self.assertIn("Interrupt", signal.strsignal(signal.SIGINT))

self.assertIn("Terminated", signal.strsignal(signal.SIGTERM))

self.assertIn("Hangup", signal.strsignal(signal.SIGHUP))

# Issue 3864, unknown if this affects earlier versions of freebsd also

def test_interprocess_signal(self):

dirname = os.path.dirname(__file__)

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.executable, "sys.executable required.")

def test_keyboard_interrupt_exit_code(self):

"""KeyboardInterrupt triggers exit via SIGINT."""

process = subprocess.run(

[sys.executable, "-c",

"import os, signal, time\n"

"os.kill(os.getpid(), signal.SIGINT)\n"

"for _ in range(999): time.sleep(0.01)"],

stderr=subprocess.PIPE)

self.assertIn(b"KeyboardInterrupt", process.stderr)

self.assertEqual(process.returncode, -signal.SIGINT)

# Caveat: The exit code is insufficient to guarantee we actually died

# via a signal. POSIX shells do more than look at the 8 bit value.

# Writing an automation friendly test of an interactive shell

# to confirm that our process died via a SIGINT proved too complex.

@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

checked = set()

for sig in (signal.SIGABRT, signal.SIGBREAK, signal.SIGFPE,

signal.SIGILL, signal.SIGINT, signal.SIGSEGV,

signal.SIGTERM):

# Set and then reset a handler for signals that work on windows.

# Issue #18396, only for signals without a C-level handler.

if signal.getsignal(sig) is not None:

signal.signal(sig, signal.signal(sig, handler))

checked.add(sig)

# Issue #18396: Ensure the above loop at least tested *something*

self.assertTrue(checked)

with self.assertRaises(ValueError):

signal.signal(-1, handler)

with self.assertRaises(ValueError):

signal.signal(7, handler)

@unittest.skipUnless(sys.executable, "sys.executable required.")

def test_keyboard_interrupt_exit_code(self):

"""KeyboardInterrupt triggers an exit using STATUS_CONTROL_C_EXIT."""

# We don't test via os.kill(os.getpid(), signal.CTRL_C_EVENT) here

# as that requires setting up a console control handler in a child

# in its own process group. Doable, but quite complicated. (see

# @eryksun on https://github.com/python/cpython/pull/11862)

process = subprocess.run(

[sys.executable, "-c", "raise KeyboardInterrupt"],

stderr=subprocess.PIPE)

self.assertIn(b"KeyboardInterrupt", process.stderr)

STATUS_CONTROL_C_EXIT = 0xC000013A

self.assertEqual(process.returncode, STATUS_CONTROL_C_EXIT)

class WakeupFDTests(unittest.TestCase):

def test_invalid_call(self):

# First parameter is positional-only

with self.assertRaises(TypeError):

signal.set_wakeup_fd(signum=signal.SIGINT)

# warn_on_full_buffer is a keyword-only parameter

with self.assertRaises(TypeError):

signal.set_wakeup_fd(signal.SIGINT, False)

def test_invalid_fd(self):

fd = os_helper.make_bad_fd()

self.assertRaises((ValueError, OSError),

signal.set_wakeup_fd, fd)

def test_invalid_socket(self):

sock = socket.socket()

fd = sock.fileno()

sock.close()

self.assertRaises((ValueError, OSError),

signal.set_wakeup_fd, fd)

def test_set_wakeup_fd_result(self):

r1, w1 = os.pipe()

self.addCleanup(os.close, r1)

self.addCleanup(os.close, w1)

r2, w2 = os.pipe()

self.addCleanup(os.close, r2)

self.addCleanup(os.close, w2)

if hasattr(os, 'set_blocking'):

os.set_blocking(w1, False)

os.set_blocking(w2, False)

signal.set_wakeup_fd(w1)

self.assertEqual(signal.set_wakeup_fd(w2), w1)

self.assertEqual(signal.set_wakeup_fd(-1), w2)

self.assertEqual(signal.set_wakeup_fd(-1), -1)

def test_set_wakeup_fd_socket_result(self):

sock1 = socket.socket()

self.addCleanup(sock1.close)

sock1.setblocking(False)

fd1 = sock1.fileno()

sock2 = socket.socket()

self.addCleanup(sock2.close)

sock2.setblocking(False)

fd2 = sock2.fileno()

signal.set_wakeup_fd(fd1)

self.assertEqual(signal.set_wakeup_fd(fd2), fd1)

self.assertEqual(signal.set_wakeup_fd(-1), fd2)

self.assertEqual(signal.set_wakeup_fd(-1), -1)

# On Windows, files are always blocking and Windows does not provide a

# function to test if a socket is in non-blocking mode.

@unittest.skipIf(sys.platform == "win32", "tests specific to POSIX")

def test_set_wakeup_fd_blocking(self):

rfd, wfd = os.pipe()

self.addCleanup(os.close, rfd)

self.addCleanup(os.close, wfd)

# fd must be non-blocking

os.set_blocking(wfd, True)

with self.assertRaises(ValueError) as cm:

signal.set_wakeup_fd(wfd)

self.assertEqual(str(cm.exception),

"the fd %s must be in non-blocking mode" % wfd)

# non-blocking is ok

os.set_blocking(wfd, False)

signal.set_wakeup_fd(wfd)

signal.set_wakeup_fd(-1)

@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")

class WakeupSignalTests(unittest.TestCase):

@unittest.skipIf(_testcapi is None, 'need _testcapi')

def check_wakeup(self, test_body, *signals, ordered=True):

# use a subprocess to have only one thread

code = """if 1:

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)

os.close(read)

os.close(write)

""".format(tuple(map(int, signals)), ordered, test_body)

assert_python_ok('-c', code)

@unittest.skipIf(_testcapi is None, 'need _testcapi')

def test_wakeup_write_error(self):

# Issue #16105: write() errors in the C signal handler should not

# pass silently.

# Use a subprocess to have only one thread.

code = """if 1:

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)

"""

r, w = os.pipe()

try:

os.write(r, b'x')

except OSError:

pass

else:

self.skipTest("OS doesn't report write() error on the read end of a pipe")

finally:

os.close(r)

os.close(w)

assert_python_ok('-c', code)

def test_wakeup_fd_early(self):

self.check_wakeup("""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))

""", signal.SIGALRM)

def test_wakeup_fd_during(self):

self.check_wakeup("""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)

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))

""", signal.SIGALRM)

def test_signum(self):

self.check_wakeup("""def test():

signal.signal(signal.SIGUSR1, handler)

signal.raise_signal(signal.SIGUSR1)

signal.raise_signal(signal.SIGALRM)

""", signal.SIGUSR1, signal.SIGALRM)

@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),

'need signal.pthread_sigmask()')

def test_pending(self):

self.check_wakeup("""def test():

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))

""", signal.SIGUSR1, signal.SIGUSR2, ordered=False)

@unittest.skipUnless(hasattr(socket, 'socketpair'), 'need socket.socketpair')

class WakeupSocketSignalTests(unittest.TestCase):

@unittest.skipIf(_testcapi is None, 'need _testcapi')

def test_socket(self):

# use a subprocess to have only one thread

code = """if 1:

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()

"""

assert_python_ok('-c', code)

@unittest.skipIf(_testcapi is None, 'need _testcapi')

def test_send_error(self):

# Use a subprocess to have only one thread.

if os.name == 'nt':

action = 'send'

else:

action = 'write'

code = """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)

""".format(action=action)

assert_python_ok('-c', code)

@unittest.skipIf(_testcapi is None, 'need _testcapi')

def test_warn_on_full_buffer(self):

# Use a subprocess to have only one thread.

if os.name == 'nt':

action = 'send'

else:

action = 'write'

code = """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)

written = 0

if sys.platform == "vxworks":

CHUNK_SIZES = (1,)

else:

# Start with large chunk size to reduce the

# number of send needed to fill the buffer.

CHUNK_SIZES = (2 ** 16, 2 ** 8, 1)

for chunk_size in CHUNK_SIZES:

chunk = b"x" * chunk_size

try:

while True:

write.send(chunk)

written += chunk_size

except (BlockingIOError, TimeoutError):

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)

""".format(action=action)

assert_python_ok('-c', code)

@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")

@unittest.skipUnless(hasattr(signal, 'siginterrupt'), "needs signal.siginterrupt()")

class SiginterruptTest(unittest.TestCase):

def readpipe_interrupted(self, interrupt):

"""Perform a read during which a signal will arrive. Return True if the

read is interrupted by the signal and raises an exception. Return False

if it returns normally.

"""

# use a subprocess to have only one thread, to have a timeout on the

# blocking read and to not touch signal handling in this process

code = """if 1:

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)

os.close(w)

""" % (interrupt,)

with spawn_python('-c', code) as process:

try:

# wait until the child process is loaded and has started

first_line = process.stdout.readline()

stdout, stderr = process.communicate(timeout=support.SHORT_TIMEOUT)

except subprocess.TimeoutExpired:

process.kill()

return False

else:

stdout = first_line + stdout

exitcode = process.wait()

if exitcode not in (2, 3):

raise Exception("Child error (exit code %s): %r"

% (exitcode, stdout))

return (exitcode == 3)

def test_without_siginterrupt(self):

# If a signal handler is installed and siginterrupt is not called

# at all, when that signal arrives, it interrupts a syscall that's in

# progress.

interrupted = self.readpipe_interrupted(None)

self.assertTrue(interrupted)

def test_siginterrupt_on(self):

# If a signal handler is installed and siginterrupt is called with

# a true value for the second argument, when that signal arrives, it

# interrupts a syscall that's in progress.

interrupted = self.readpipe_interrupted(True)

self.assertTrue(interrupted)

def test_siginterrupt_off(self):

# If a signal handler is installed and siginterrupt is called with

# a false value for the second argument, when that signal arrives, it

# does not interrupt a syscall that's in progress.

interrupted = self.readpipe_interrupted(False)

self.assertFalse(interrupted)

@unittest.skipIf(sys.platform == "win32", "Not valid on Windows")

@unittest.skipUnless(hasattr(signal, 'getitimer') and hasattr(signal, 'setitimer'),

"needs signal.getitimer() and signal.setitimer()")

class ItimerTest(unittest.TestCase):

def setUp(self):

self.hndl_called = False

self.hndl_count = 0

self.itimer = None

self.old_alarm = signal.signal(signal.SIGALRM, self.sig_alrm)

def tearDown(self):

signal.signal(signal.SIGALRM, self.old_alarm)

if self.itimer is not None: # test_itimer_exc doesn't change this attr

# just ensure that itimer is stopped

signal.setitimer(self.itimer, 0)

def sig_alrm(self, *args):

self.hndl_called = True

def sig_vtalrm(self, *args):

self.hndl_called = True

if self.hndl_count > 3:

# it shouldn't be here, because it should have been disabled.

raise signal.ItimerError("setitimer didn't disable ITIMER_VIRTUAL "

"timer.")

elif self.hndl_count == 3:

# disable ITIMER_VIRTUAL, this function shouldn't be called anymore

signal.setitimer(signal.ITIMER_VIRTUAL, 0)

self.hndl_count += 1

def sig_prof(self, *args):

self.hndl_called = True

signal.setitimer(signal.ITIMER_PROF, 0)

def test_itimer_exc(self):

# XXX I'm assuming -1 is an invalid itimer, but maybe some platform

# defines it ?

self.assertRaises(signal.ItimerError, signal.setitimer, -1, 0)

# Negative times are treated as zero on some platforms.

if 0:

self.assertRaises(signal.ItimerError,

signal.setitimer, signal.ITIMER_REAL, -1)

def test_itimer_real(self):

self.itimer = signal.ITIMER_REAL

signal.setitimer(self.itimer, 1.0)

signal.pause()

self.assertEqual(self.hndl_called, True)

# Issue 3864, unknown if this affects earlier versions of freebsd also

@unittest.skipIf(sys.platform in ('netbsd5',),

'itimer not reliable (does not mix well with threading) on some BSDs.')

def test_itimer_virtual(self):

self.itimer = signal.ITIMER_VIRTUAL

signal.signal(signal.SIGVTALRM, self.sig_vtalrm)

signal.setitimer(self.itimer, 0.3, 0.2)

start_time = time.monotonic()

while time.monotonic() - start_time < 60.0:

# use up some virtual time by doing real work

_ = pow(12345, 67890, 10000019)

if signal.getitimer(self.itimer) == (0.0, 0.0):

break # sig_vtalrm handler stopped this itimer

else: # Issue 8424

self.skipTest("timeout: likely cause: machine too slow or load too "

"high")

# virtual itimer should be (0.0, 0.0) now

self.assertEqual(signal.getitimer(self.itimer), (0.0, 0.0))

# and the handler should have been called

self.assertEqual(self.hndl_called, True)

def test_itimer_prof(self):

self.itimer = signal.ITIMER_PROF

signal.signal(signal.SIGPROF, self.sig_prof)

signal.setitimer(self.itimer, 0.2, 0.2)

start_time = time.monotonic()

while time.monotonic() - start_time < 60.0:

# do some work

_ = pow(12345, 67890, 10000019)

if signal.getitimer(self.itimer) == (0.0, 0.0):

break # sig_prof handler stopped this itimer

else: # Issue 8424

self.skipTest("timeout: likely cause: machine too slow or load too "

"high")

# profiling itimer should be (0.0, 0.0) now

self.assertEqual(signal.getitimer(self.itimer), (0.0, 0.0))

# and the handler should have been called

self.assertEqual(self.hndl_called, True)

def test_setitimer_tiny(self):

# bpo-30807: C setitimer() takes a microsecond-resolution interval.

# Check that float -> timeval conversion doesn't round

# the interval down to zero, which would disable the timer.

self.itimer = signal.ITIMER_REAL

signal.setitimer(self.itimer, 1e-6)

time.sleep(1)

self.assertEqual(self.hndl_called, True)

class PendingSignalsTests(unittest.TestCase):

"""

Test pthread_sigmask(), pthread_kill(), sigpending() and sigwait()

functions.

"""

@unittest.skipUnless(hasattr(signal, 'sigpending'),

'need signal.sigpending()')

def test_sigpending_empty(self):

self.assertEqual(signal.sigpending(), set())

@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),

'need signal.pthread_sigmask()')

@unittest.skipUnless(hasattr(signal, 'sigpending'),

'need signal.sigpending()')

def test_sigpending(self):

code = """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")

"""

assert_python_ok('-c', code)

@unittest.skipUnless(hasattr(signal, 'pthread_kill'),

'need signal.pthread_kill()')

def test_pthread_kill(self):

code = """if 1:

import signal

import threading

import sys

signum = signal.SIGUSR1

def handler(signum, frame):

1/0

signal.signal(signum, handler)

tid = threading.get_ident()

try:

signal.pthread_kill(tid, signum)

except ZeroDivisionError:

pass

else:

raise Exception("ZeroDivisionError not raised")

"""

assert_python_ok('-c', code)

@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),

'need signal.pthread_sigmask()')

def wait_helper(self, blocked, test):

"""

test: body of the "def test(signum):" function.

blocked: number of the blocked signal

"""

code = '''if 1:

import signal

import sys

from signal import Signals

def handler(signum, frame):

1/0

blocked = %r

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)

except BaseException as err:

print("error: {}".format(err), file=sys.stderr)

sys.stderr.flush()

sys.exit(1)

''' % (test.strip(), blocked)

# sig*wait* must be called with the signal blocked: since the current

# process might have several threads running, use a subprocess to have

# a single thread.

assert_python_ok('-c', code)

@unittest.skipUnless(hasattr(signal, 'sigwait'),

'need signal.sigwait()')

def test_sigwait(self):

self.wait_helper(signal.SIGALRM, '''

def test(signum):

signal.alarm(1)

received = signal.sigwait([signum])

assert isinstance(received, signal.Signals), received

if received != signum:

raise Exception('received %s, not %s' % (received, signum))

''')

@unittest.skipUnless(hasattr(signal, 'sigwaitinfo'),

'need signal.sigwaitinfo()')

def test_sigwaitinfo(self):

self.wait_helper(signal.SIGALRM, '''

def test(signum):

signal.alarm(1)

info = signal.sigwaitinfo([signum])

if info.si_signo != signum:

raise Exception("info.si_signo != %s" % signum)

''')

@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),

'need signal.sigtimedwait()')

def test_sigtimedwait(self):

self.wait_helper(signal.SIGALRM, '''

def test(signum):

signal.alarm(1)

info = signal.sigtimedwait([signum], 10.1000)

if info.si_signo != signum:

raise Exception('info.si_signo != %s' % signum)

''')

@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),

'need signal.sigtimedwait()')

def test_sigtimedwait_poll(self):

# check that polling with sigtimedwait works

self.wait_helper(signal.SIGALRM, '''

def test(signum):

import os

os.kill(os.getpid(), signum)

info = signal.sigtimedwait([signum], 0)

if info.si_signo != signum:

raise Exception('info.si_signo != %s' % signum)

''')

@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),

'need signal.sigtimedwait()')

def test_sigtimedwait_timeout(self):

self.wait_helper(signal.SIGALRM, '''

def test(signum):

received = signal.sigtimedwait([signum], 1.0)

if received is not None:

raise Exception("received=%r" % (received,))

''')

@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),

'need signal.sigtimedwait()')

def test_sigtimedwait_negative_timeout(self):

signum = signal.SIGALRM

self.assertRaises(ValueError, signal.sigtimedwait, [signum], -1.0)

@unittest.skipUnless(hasattr(signal, 'sigwait'),

'need signal.sigwait()')

@unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),

'need signal.pthread_sigmask()')

def test_sigwait_thread(self):

# Check that calling sigwait() from a thread doesn't suspend the whole

# process. A new interpreter is spawned to avoid problems when mixing

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