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7a51a7e19f
test_builtin.PtyTests now registers an handler for SIGHUP signal. Closing the PTY file descriptor can emit a SIGHUP signal: just ignore it. run_child() now also closes the PTY file descriptor before waiting for the process completition, otherwise the test hangs on AIX.
325 lines
12 KiB
Python
325 lines
12 KiB
Python
from test.support import verbose, import_module, reap_children
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# Skip these tests if termios is not available
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import_module('termios')
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import errno
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import pty
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import os
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import sys
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import select
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import signal
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import socket
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import io # readline
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import unittest
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TEST_STRING_1 = b"I wish to buy a fish license.\n"
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TEST_STRING_2 = b"For my pet fish, Eric.\n"
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if verbose:
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def debug(msg):
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print(msg)
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else:
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def debug(msg):
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pass
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# Note that os.read() is nondeterministic so we need to be very careful
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# to make the test suite deterministic. A normal call to os.read() may
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# give us less than expected.
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#
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# Beware, on my Linux system, if I put 'foo\n' into a terminal fd, I get
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# back 'foo\r\n' at the other end. The behavior depends on the termios
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# setting. The newline translation may be OS-specific. To make the
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# test suite deterministic and OS-independent, the functions _readline
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# and normalize_output can be used.
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def normalize_output(data):
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# Some operating systems do conversions on newline. We could possibly fix
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# that by doing the appropriate termios.tcsetattr()s. I couldn't figure out
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# the right combo on Tru64. So, just normalize the output and doc the
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# problem O/Ses by allowing certain combinations for some platforms, but
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# avoid allowing other differences (like extra whitespace, trailing garbage,
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# etc.)
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# This is about the best we can do without getting some feedback
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# from someone more knowledgable.
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# OSF/1 (Tru64) apparently turns \n into \r\r\n.
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if data.endswith(b'\r\r\n'):
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return data.replace(b'\r\r\n', b'\n')
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if data.endswith(b'\r\n'):
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return data.replace(b'\r\n', b'\n')
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return data
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def _readline(fd):
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"""Read one line. May block forever if no newline is read."""
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reader = io.FileIO(fd, mode='rb', closefd=False)
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return reader.readline()
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# Marginal testing of pty suite. Cannot do extensive 'do or fail' testing
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# because pty code is not too portable.
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# XXX(nnorwitz): these tests leak fds when there is an error.
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class PtyTest(unittest.TestCase):
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def setUp(self):
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old_alarm = signal.signal(signal.SIGALRM, self.handle_sig)
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self.addCleanup(signal.signal, signal.SIGALRM, old_alarm)
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old_sighup = signal.signal(signal.SIGHUP, self.handle_sighup)
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self.addCleanup(signal.signal, signal.SIGHUP, old_sighup)
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# isatty() and close() can hang on some platforms. Set an alarm
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# before running the test to make sure we don't hang forever.
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self.addCleanup(signal.alarm, 0)
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signal.alarm(10)
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def handle_sig(self, sig, frame):
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self.fail("isatty hung")
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@staticmethod
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def handle_sighup(signum, frame):
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# bpo-38547: if the process is the session leader, os.close(master_fd)
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# of "master_fd, slave_name = pty.master_open()" raises SIGHUP
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# signal: just ignore the signal.
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pass
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def test_basic(self):
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try:
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debug("Calling master_open()")
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master_fd, slave_name = pty.master_open()
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debug("Got master_fd '%d', slave_name '%s'" %
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(master_fd, slave_name))
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debug("Calling slave_open(%r)" % (slave_name,))
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slave_fd = pty.slave_open(slave_name)
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debug("Got slave_fd '%d'" % slave_fd)
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except OSError:
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# " An optional feature could not be imported " ... ?
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raise unittest.SkipTest("Pseudo-terminals (seemingly) not functional.")
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self.assertTrue(os.isatty(slave_fd), 'slave_fd is not a tty')
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# Solaris requires reading the fd before anything is returned.
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# My guess is that since we open and close the slave fd
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# in master_open(), we need to read the EOF.
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# Ensure the fd is non-blocking in case there's nothing to read.
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blocking = os.get_blocking(master_fd)
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try:
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os.set_blocking(master_fd, False)
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try:
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s1 = os.read(master_fd, 1024)
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self.assertEqual(b'', s1)
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except OSError as e:
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if e.errno != errno.EAGAIN:
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raise
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finally:
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# Restore the original flags.
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os.set_blocking(master_fd, blocking)
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debug("Writing to slave_fd")
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os.write(slave_fd, TEST_STRING_1)
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s1 = _readline(master_fd)
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self.assertEqual(b'I wish to buy a fish license.\n',
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normalize_output(s1))
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debug("Writing chunked output")
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os.write(slave_fd, TEST_STRING_2[:5])
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os.write(slave_fd, TEST_STRING_2[5:])
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s2 = _readline(master_fd)
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self.assertEqual(b'For my pet fish, Eric.\n', normalize_output(s2))
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os.close(slave_fd)
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# closing master_fd can raise a SIGHUP if the process is
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# the session leader: we installed a SIGHUP signal handler
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# to ignore this signal.
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os.close(master_fd)
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def test_fork(self):
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debug("calling pty.fork()")
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pid, master_fd = pty.fork()
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if pid == pty.CHILD:
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# stdout should be connected to a tty.
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if not os.isatty(1):
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debug("Child's fd 1 is not a tty?!")
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os._exit(3)
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# After pty.fork(), the child should already be a session leader.
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# (on those systems that have that concept.)
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debug("In child, calling os.setsid()")
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try:
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os.setsid()
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except OSError:
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# Good, we already were session leader
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debug("Good: OSError was raised.")
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pass
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except AttributeError:
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# Have pty, but not setsid()?
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debug("No setsid() available?")
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pass
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except:
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# We don't want this error to propagate, escaping the call to
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# os._exit() and causing very peculiar behavior in the calling
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# regrtest.py !
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# Note: could add traceback printing here.
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debug("An unexpected error was raised.")
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os._exit(1)
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else:
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debug("os.setsid() succeeded! (bad!)")
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os._exit(2)
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os._exit(4)
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else:
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debug("Waiting for child (%d) to finish." % pid)
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# In verbose mode, we have to consume the debug output from the
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# child or the child will block, causing this test to hang in the
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# parent's waitpid() call. The child blocks after a
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# platform-dependent amount of data is written to its fd. On
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# Linux 2.6, it's 4000 bytes and the child won't block, but on OS
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# X even the small writes in the child above will block it. Also
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# on Linux, the read() will raise an OSError (input/output error)
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# when it tries to read past the end of the buffer but the child's
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# already exited, so catch and discard those exceptions. It's not
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# worth checking for EIO.
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while True:
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try:
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data = os.read(master_fd, 80)
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except OSError:
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break
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if not data:
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break
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sys.stdout.write(str(data.replace(b'\r\n', b'\n'),
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encoding='ascii'))
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##line = os.read(master_fd, 80)
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##lines = line.replace('\r\n', '\n').split('\n')
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##if False and lines != ['In child, calling os.setsid()',
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## 'Good: OSError was raised.', '']:
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## raise TestFailed("Unexpected output from child: %r" % line)
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(pid, status) = os.waitpid(pid, 0)
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res = os.waitstatus_to_exitcode(status)
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debug("Child (%d) exited with code %d (status %d)." % (pid, res, status))
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if res == 1:
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self.fail("Child raised an unexpected exception in os.setsid()")
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elif res == 2:
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self.fail("pty.fork() failed to make child a session leader.")
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elif res == 3:
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self.fail("Child spawned by pty.fork() did not have a tty as stdout")
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elif res != 4:
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self.fail("pty.fork() failed for unknown reasons.")
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##debug("Reading from master_fd now that the child has exited")
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##try:
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## s1 = os.read(master_fd, 1024)
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##except OSError:
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## pass
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##else:
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## raise TestFailed("Read from master_fd did not raise exception")
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os.close(master_fd)
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# pty.fork() passed.
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class SmallPtyTests(unittest.TestCase):
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"""These tests don't spawn children or hang."""
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def setUp(self):
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self.orig_stdin_fileno = pty.STDIN_FILENO
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self.orig_stdout_fileno = pty.STDOUT_FILENO
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self.orig_pty_select = pty.select
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self.fds = [] # A list of file descriptors to close.
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self.files = []
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self.select_rfds_lengths = []
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self.select_rfds_results = []
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def tearDown(self):
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pty.STDIN_FILENO = self.orig_stdin_fileno
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pty.STDOUT_FILENO = self.orig_stdout_fileno
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pty.select = self.orig_pty_select
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for file in self.files:
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try:
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file.close()
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except OSError:
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pass
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for fd in self.fds:
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try:
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os.close(fd)
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except OSError:
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pass
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def _pipe(self):
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pipe_fds = os.pipe()
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self.fds.extend(pipe_fds)
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return pipe_fds
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def _socketpair(self):
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socketpair = socket.socketpair()
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self.files.extend(socketpair)
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return socketpair
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def _mock_select(self, rfds, wfds, xfds):
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# This will raise IndexError when no more expected calls exist.
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self.assertEqual(self.select_rfds_lengths.pop(0), len(rfds))
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return self.select_rfds_results.pop(0), [], []
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def test__copy_to_each(self):
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"""Test the normal data case on both master_fd and stdin."""
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read_from_stdout_fd, mock_stdout_fd = self._pipe()
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pty.STDOUT_FILENO = mock_stdout_fd
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mock_stdin_fd, write_to_stdin_fd = self._pipe()
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pty.STDIN_FILENO = mock_stdin_fd
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socketpair = self._socketpair()
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masters = [s.fileno() for s in socketpair]
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# Feed data. Smaller than PIPEBUF. These writes will not block.
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os.write(masters[1], b'from master')
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os.write(write_to_stdin_fd, b'from stdin')
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# Expect two select calls, the last one will cause IndexError
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pty.select = self._mock_select
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self.select_rfds_lengths.append(2)
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self.select_rfds_results.append([mock_stdin_fd, masters[0]])
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self.select_rfds_lengths.append(2)
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with self.assertRaises(IndexError):
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pty._copy(masters[0])
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# Test that the right data went to the right places.
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rfds = select.select([read_from_stdout_fd, masters[1]], [], [], 0)[0]
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self.assertEqual([read_from_stdout_fd, masters[1]], rfds)
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self.assertEqual(os.read(read_from_stdout_fd, 20), b'from master')
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self.assertEqual(os.read(masters[1], 20), b'from stdin')
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def test__copy_eof_on_all(self):
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"""Test the empty read EOF case on both master_fd and stdin."""
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read_from_stdout_fd, mock_stdout_fd = self._pipe()
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pty.STDOUT_FILENO = mock_stdout_fd
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mock_stdin_fd, write_to_stdin_fd = self._pipe()
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pty.STDIN_FILENO = mock_stdin_fd
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socketpair = self._socketpair()
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masters = [s.fileno() for s in socketpair]
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socketpair[1].close()
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os.close(write_to_stdin_fd)
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# Expect two select calls, the last one will cause IndexError
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pty.select = self._mock_select
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self.select_rfds_lengths.append(2)
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self.select_rfds_results.append([mock_stdin_fd, masters[0]])
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# We expect that both fds were removed from the fds list as they
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# both encountered an EOF before the second select call.
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self.select_rfds_lengths.append(0)
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with self.assertRaises(IndexError):
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pty._copy(masters[0])
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def tearDownModule():
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reap_children()
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if __name__ == "__main__":
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unittest.main()
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