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be923ac948
eintr_tester.py calls signal.setitimer() to send signals to the current process every 100 ms. The test sometimes hangs on FreeBSD. Maybe there is a race condition in the child process after fork(). It's unsafe to run arbitrary code after fork(). This change replace os.fork() with a regular call to subprocess.Popen(). This change avoids the risk of having a child process which continue to execute eintr_tester.py instead of exiting. It also ensures that the child process doesn't inherit unexpected file descriptors by mistake. Since I'm unable to reproduce the issue on FreeBSD, I will have to watch FreeBSD buildbots to check if the issue is fixed or not. Remove previous attempt to debug: remove call to faulthandler.dump_traceback_later().
441 lines
14 KiB
Python
441 lines
14 KiB
Python
"""
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This test suite exercises some system calls subject to interruption with EINTR,
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to check that it is actually handled transparently.
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It is intended to be run by the main test suite within a child process, to
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ensure there is no background thread running (so that signals are delivered to
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the correct thread).
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Signals are generated in-process using setitimer(ITIMER_REAL), which allows
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sub-second periodicity (contrarily to signal()).
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"""
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import io
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import os
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import select
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import signal
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import socket
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import subprocess
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import sys
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import time
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import unittest
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from test import support
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@unittest.skipUnless(hasattr(signal, "setitimer"), "requires setitimer()")
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class EINTRBaseTest(unittest.TestCase):
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""" Base class for EINTR tests. """
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# delay for initial signal delivery
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signal_delay = 0.1
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# signal delivery periodicity
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signal_period = 0.1
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# default sleep time for tests - should obviously have:
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# sleep_time > signal_period
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sleep_time = 0.2
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@classmethod
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def setUpClass(cls):
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cls.orig_handler = signal.signal(signal.SIGALRM, lambda *args: None)
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signal.setitimer(signal.ITIMER_REAL, cls.signal_delay,
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cls.signal_period)
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@classmethod
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def stop_alarm(cls):
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signal.setitimer(signal.ITIMER_REAL, 0, 0)
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@classmethod
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def tearDownClass(cls):
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cls.stop_alarm()
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signal.signal(signal.SIGALRM, cls.orig_handler)
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@classmethod
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def _sleep(cls):
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# default sleep time
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time.sleep(cls.sleep_time)
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def subprocess(self, *args, **kw):
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cmd_args = (sys.executable, '-c') + args
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return subprocess.Popen(cmd_args, **kw)
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@unittest.skipUnless(hasattr(signal, "setitimer"), "requires setitimer()")
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class OSEINTRTest(EINTRBaseTest):
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""" EINTR tests for the os module. """
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def new_sleep_process(self):
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code = 'import time; time.sleep(%r)' % self.sleep_time
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return self.subprocess(code)
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def _test_wait_multiple(self, wait_func):
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num = 3
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processes = [self.new_sleep_process() for _ in range(num)]
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for _ in range(num):
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wait_func()
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def test_wait(self):
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self._test_wait_multiple(os.wait)
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@unittest.skipUnless(hasattr(os, 'wait3'), 'requires wait3()')
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def test_wait3(self):
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self._test_wait_multiple(lambda: os.wait3(0))
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def _test_wait_single(self, wait_func):
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proc = self.new_sleep_process()
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wait_func(proc.pid)
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def test_waitpid(self):
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self._test_wait_single(lambda pid: os.waitpid(pid, 0))
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@unittest.skipUnless(hasattr(os, 'wait4'), 'requires wait4()')
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def test_wait4(self):
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self._test_wait_single(lambda pid: os.wait4(pid, 0))
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def test_read(self):
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rd, wr = os.pipe()
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self.addCleanup(os.close, rd)
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# wr closed explicitly by parent
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# the payload below are smaller than PIPE_BUF, hence the writes will be
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# atomic
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datas = [b"hello", b"world", b"spam"]
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code = '\n'.join((
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'import os, sys, time',
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'',
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'wr = int(sys.argv[1])',
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'datas = %r' % datas,
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'sleep_time = %r' % self.sleep_time,
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'',
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'for data in datas:',
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' # let the parent block on read()',
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' time.sleep(sleep_time)',
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' os.write(wr, data)',
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))
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with self.subprocess(code, str(wr), pass_fds=[wr]) as proc:
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os.close(wr)
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for data in datas:
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self.assertEqual(data, os.read(rd, len(data)))
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self.assertEqual(proc.wait(), 0)
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def test_write(self):
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rd, wr = os.pipe()
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self.addCleanup(os.close, wr)
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# rd closed explicitly by parent
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# we must write enough data for the write() to block
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data = b"xyz" * support.PIPE_MAX_SIZE
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code = '\n'.join((
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'import io, os, sys, time',
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'',
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'rd = int(sys.argv[1])',
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'sleep_time = %r' % self.sleep_time,
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'data = b"xyz" * %s' % support.PIPE_MAX_SIZE,
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'data_len = len(data)',
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'',
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'# let the parent block on write()',
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'time.sleep(sleep_time)',
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'',
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'read_data = io.BytesIO()',
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'while len(read_data.getvalue()) < data_len:',
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' chunk = os.read(rd, 2 * data_len)',
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' read_data.write(chunk)',
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'',
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'value = read_data.getvalue()',
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'if value != data:',
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' raise Exception("read error: %s vs %s bytes"',
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' % (len(value), data_len))',
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))
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with self.subprocess(code, str(rd), pass_fds=[rd]) as proc:
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os.close(rd)
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written = 0
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while written < len(data):
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written += os.write(wr, memoryview(data)[written:])
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self.assertEqual(proc.wait(), 0)
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@unittest.skipUnless(hasattr(signal, "setitimer"), "requires setitimer()")
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class SocketEINTRTest(EINTRBaseTest):
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""" EINTR tests for the socket module. """
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@unittest.skipUnless(hasattr(socket, 'socketpair'), 'needs socketpair()')
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def _test_recv(self, recv_func):
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rd, wr = socket.socketpair()
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self.addCleanup(rd.close)
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# wr closed explicitly by parent
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# single-byte payload guard us against partial recv
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datas = [b"x", b"y", b"z"]
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code = '\n'.join((
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'import os, socket, sys, time',
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'',
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'fd = int(sys.argv[1])',
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'family = %s' % int(wr.family),
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'sock_type = %s' % int(wr.type),
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'datas = %r' % datas,
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'sleep_time = %r' % self.sleep_time,
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'',
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'wr = socket.fromfd(fd, family, sock_type)',
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'os.close(fd)',
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'',
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'with wr:',
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' for data in datas:',
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' # let the parent block on recv()',
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' time.sleep(sleep_time)',
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' wr.sendall(data)',
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))
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fd = wr.fileno()
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proc = self.subprocess(code, str(fd), pass_fds=[fd])
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with proc:
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wr.close()
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for data in datas:
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self.assertEqual(data, recv_func(rd, len(data)))
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self.assertEqual(proc.wait(), 0)
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def test_recv(self):
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self._test_recv(socket.socket.recv)
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@unittest.skipUnless(hasattr(socket.socket, 'recvmsg'), 'needs recvmsg()')
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def test_recvmsg(self):
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self._test_recv(lambda sock, data: sock.recvmsg(data)[0])
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def _test_send(self, send_func):
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rd, wr = socket.socketpair()
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self.addCleanup(wr.close)
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# rd closed explicitly by parent
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# we must send enough data for the send() to block
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data = b"xyz" * (support.SOCK_MAX_SIZE // 3)
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code = '\n'.join((
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'import os, socket, sys, time',
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'',
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'fd = int(sys.argv[1])',
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'family = %s' % int(rd.family),
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'sock_type = %s' % int(rd.type),
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'sleep_time = %r' % self.sleep_time,
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'data = b"xyz" * %s' % (support.SOCK_MAX_SIZE // 3),
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'data_len = len(data)',
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'',
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'rd = socket.fromfd(fd, family, sock_type)',
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'os.close(fd)',
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'',
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'with rd:',
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' # let the parent block on send()',
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' time.sleep(sleep_time)',
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'',
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' received_data = bytearray(data_len)',
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' n = 0',
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' while n < data_len:',
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' n += rd.recv_into(memoryview(received_data)[n:])',
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'',
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'if received_data != data:',
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' raise Exception("recv error: %s vs %s bytes"',
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' % (len(received_data), data_len))',
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))
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fd = rd.fileno()
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proc = self.subprocess(code, str(fd), pass_fds=[fd])
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with proc:
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rd.close()
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written = 0
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while written < len(data):
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sent = send_func(wr, memoryview(data)[written:])
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# sendall() returns None
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written += len(data) if sent is None else sent
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self.assertEqual(proc.wait(), 0)
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def test_send(self):
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self._test_send(socket.socket.send)
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def test_sendall(self):
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self._test_send(socket.socket.sendall)
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@unittest.skipUnless(hasattr(socket.socket, 'sendmsg'), 'needs sendmsg()')
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def test_sendmsg(self):
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self._test_send(lambda sock, data: sock.sendmsg([data]))
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def test_accept(self):
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.addCleanup(sock.close)
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sock.bind((support.HOST, 0))
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port = sock.getsockname()[1]
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sock.listen()
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code = '\n'.join((
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'import socket, time',
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'',
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'host = %r' % support.HOST,
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'port = %s' % port,
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'sleep_time = %r' % self.sleep_time,
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'',
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'# let parent block on accept()',
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'time.sleep(sleep_time)',
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'with socket.create_connection((host, port)):',
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' time.sleep(sleep_time)',
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))
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with self.subprocess(code) as proc:
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client_sock, _ = sock.accept()
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client_sock.close()
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self.assertEqual(proc.wait(), 0)
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@unittest.skipUnless(hasattr(os, 'mkfifo'), 'needs mkfifo()')
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def _test_open(self, do_open_close_reader, do_open_close_writer):
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filename = support.TESTFN
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# Use a fifo: until the child opens it for reading, the parent will
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# block when trying to open it for writing.
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support.unlink(filename)
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os.mkfifo(filename)
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self.addCleanup(support.unlink, filename)
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code = '\n'.join((
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'import os, time',
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'',
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'path = %a' % filename,
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'sleep_time = %r' % self.sleep_time,
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'',
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'# let the parent block',
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'time.sleep(sleep_time)',
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'',
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do_open_close_reader,
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))
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with self.subprocess(code) as proc:
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do_open_close_writer(filename)
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self.assertEqual(proc.wait(), 0)
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def test_open(self):
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self._test_open("open(path, 'r').close()",
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lambda path: open(path, 'w').close())
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def test_os_open(self):
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self._test_open("os.close(os.open(path, os.O_RDONLY))",
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lambda path: os.close(os.open(path, os.O_WRONLY)))
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@unittest.skipUnless(hasattr(signal, "setitimer"), "requires setitimer()")
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class TimeEINTRTest(EINTRBaseTest):
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""" EINTR tests for the time module. """
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def test_sleep(self):
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t0 = time.monotonic()
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time.sleep(self.sleep_time)
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self.stop_alarm()
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dt = time.monotonic() - t0
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self.assertGreaterEqual(dt, self.sleep_time)
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@unittest.skipUnless(hasattr(signal, "setitimer"), "requires setitimer()")
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class SignalEINTRTest(EINTRBaseTest):
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""" EINTR tests for the signal module. """
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@unittest.skipUnless(hasattr(signal, 'sigtimedwait'),
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'need signal.sigtimedwait()')
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def test_sigtimedwait(self):
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t0 = time.monotonic()
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signal.sigtimedwait([signal.SIGUSR1], self.sleep_time)
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dt = time.monotonic() - t0
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self.assertGreaterEqual(dt, self.sleep_time)
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@unittest.skipUnless(hasattr(signal, 'sigwaitinfo'),
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'need signal.sigwaitinfo()')
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def test_sigwaitinfo(self):
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signum = signal.SIGUSR1
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pid = os.getpid()
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old_handler = signal.signal(signum, lambda *args: None)
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self.addCleanup(signal.signal, signum, old_handler)
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code = '\n'.join((
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'import os, time',
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'pid = %s' % os.getpid(),
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'signum = %s' % int(signum),
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'sleep_time = %r' % self.sleep_time,
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'time.sleep(sleep_time)',
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'os.kill(pid, signum)',
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))
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t0 = time.monotonic()
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with self.subprocess(code) as proc:
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# parent
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signal.sigwaitinfo([signum])
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dt = time.monotonic() - t0
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self.assertEqual(proc.wait(), 0)
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self.assertGreaterEqual(dt, self.sleep_time)
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@unittest.skipUnless(hasattr(signal, "setitimer"), "requires setitimer()")
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class SelectEINTRTest(EINTRBaseTest):
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""" EINTR tests for the select module. """
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def test_select(self):
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t0 = time.monotonic()
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select.select([], [], [], self.sleep_time)
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dt = time.monotonic() - t0
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self.stop_alarm()
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self.assertGreaterEqual(dt, self.sleep_time)
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@unittest.skipUnless(hasattr(select, 'poll'), 'need select.poll')
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def test_poll(self):
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poller = select.poll()
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t0 = time.monotonic()
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poller.poll(self.sleep_time * 1e3)
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dt = time.monotonic() - t0
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self.stop_alarm()
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self.assertGreaterEqual(dt, self.sleep_time)
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@unittest.skipUnless(hasattr(select, 'epoll'), 'need select.epoll')
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def test_epoll(self):
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poller = select.epoll()
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self.addCleanup(poller.close)
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t0 = time.monotonic()
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poller.poll(self.sleep_time)
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dt = time.monotonic() - t0
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self.stop_alarm()
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self.assertGreaterEqual(dt, self.sleep_time)
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@unittest.skipUnless(hasattr(select, 'kqueue'), 'need select.kqueue')
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def test_kqueue(self):
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kqueue = select.kqueue()
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self.addCleanup(kqueue.close)
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t0 = time.monotonic()
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kqueue.control(None, 1, self.sleep_time)
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dt = time.monotonic() - t0
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self.stop_alarm()
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self.assertGreaterEqual(dt, self.sleep_time)
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@unittest.skipUnless(hasattr(select, 'devpoll'), 'need select.devpoll')
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def test_devpoll(self):
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poller = select.devpoll()
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self.addCleanup(poller.close)
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t0 = time.monotonic()
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poller.poll(self.sleep_time * 1e3)
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dt = time.monotonic() - t0
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self.stop_alarm()
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self.assertGreaterEqual(dt, self.sleep_time)
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def test_main():
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support.run_unittest(
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OSEINTRTest,
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SocketEINTRTest,
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TimeEINTRTest,
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SignalEINTRTest,
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SelectEINTRTest)
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if __name__ == "__main__":
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test_main()
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