| from test.support import verbose, reap_children |
| from test.support.import_helper import import_module |
| |
| # Skip these tests if termios is not available |
| import_module('termios') |
| |
| import errno |
| import os |
| import pty |
| import tty |
| import sys |
| import select |
| import signal |
| import socket |
| import io # readline |
| import unittest |
| |
| import struct |
| import fcntl |
| import warnings |
| |
| TEST_STRING_1 = b"I wish to buy a fish license.\n" |
| TEST_STRING_2 = b"For my pet fish, Eric.\n" |
| |
| try: |
| _TIOCGWINSZ = tty.TIOCGWINSZ |
| _TIOCSWINSZ = tty.TIOCSWINSZ |
| _HAVE_WINSZ = True |
| except AttributeError: |
| _HAVE_WINSZ = False |
| |
| if verbose: |
| def debug(msg): |
| print(msg) |
| else: |
| def debug(msg): |
| pass |
| |
| |
| # Note that os.read() is nondeterministic so we need to be very careful |
| # to make the test suite deterministic. A normal call to os.read() may |
| # give us less than expected. |
| # |
| # Beware, on my Linux system, if I put 'foo\n' into a terminal fd, I get |
| # back 'foo\r\n' at the other end. The behavior depends on the termios |
| # setting. The newline translation may be OS-specific. To make the |
| # test suite deterministic and OS-independent, the functions _readline |
| # and normalize_output can be used. |
| |
| def normalize_output(data): |
| # Some operating systems do conversions on newline. We could possibly fix |
| # that by doing the appropriate termios.tcsetattr()s. I couldn't figure out |
| # the right combo on Tru64. So, just normalize the output and doc the |
| # problem O/Ses by allowing certain combinations for some platforms, but |
| # avoid allowing other differences (like extra whitespace, trailing garbage, |
| # etc.) |
| |
| # This is about the best we can do without getting some feedback |
| # from someone more knowledgable. |
| |
| # OSF/1 (Tru64) apparently turns \n into \r\r\n. |
| if data.endswith(b'\r\r\n'): |
| return data.replace(b'\r\r\n', b'\n') |
| |
| if data.endswith(b'\r\n'): |
| return data.replace(b'\r\n', b'\n') |
| |
| return data |
| |
| def _readline(fd): |
| """Read one line. May block forever if no newline is read.""" |
| reader = io.FileIO(fd, mode='rb', closefd=False) |
| return reader.readline() |
| |
| def expectedFailureIfStdinIsTTY(fun): |
| # avoid isatty() |
| try: |
| tty.tcgetattr(pty.STDIN_FILENO) |
| return unittest.expectedFailure(fun) |
| except tty.error: |
| pass |
| return fun |
| |
| def _get_term_winsz(fd): |
| s = struct.pack("HHHH", 0, 0, 0, 0) |
| return fcntl.ioctl(fd, _TIOCGWINSZ, s) |
| |
| def _set_term_winsz(fd, winsz): |
| fcntl.ioctl(fd, _TIOCSWINSZ, winsz) |
| |
| |
| # Marginal testing of pty suite. Cannot do extensive 'do or fail' testing |
| # because pty code is not too portable. |
| class PtyTest(unittest.TestCase): |
| def setUp(self): |
| old_alarm = signal.signal(signal.SIGALRM, self.handle_sig) |
| self.addCleanup(signal.signal, signal.SIGALRM, old_alarm) |
| |
| old_sighup = signal.signal(signal.SIGHUP, self.handle_sighup) |
| self.addCleanup(signal.signal, signal.SIGHUP, old_sighup) |
| |
| # isatty() and close() can hang on some platforms. Set an alarm |
| # before running the test to make sure we don't hang forever. |
| self.addCleanup(signal.alarm, 0) |
| signal.alarm(10) |
| |
| # Save original stdin window size |
| self.stdin_rows = None |
| self.stdin_cols = None |
| if _HAVE_WINSZ: |
| try: |
| stdin_dim = os.get_terminal_size(pty.STDIN_FILENO) |
| self.stdin_rows = stdin_dim.lines |
| self.stdin_cols = stdin_dim.columns |
| old_stdin_winsz = struct.pack("HHHH", self.stdin_rows, |
| self.stdin_cols, 0, 0) |
| self.addCleanup(_set_term_winsz, pty.STDIN_FILENO, old_stdin_winsz) |
| except OSError: |
| pass |
| |
| def handle_sig(self, sig, frame): |
| self.fail("isatty hung") |
| |
| @staticmethod |
| def handle_sighup(signum, frame): |
| pass |
| |
| @expectedFailureIfStdinIsTTY |
| def test_openpty(self): |
| try: |
| mode = tty.tcgetattr(pty.STDIN_FILENO) |
| except tty.error: |
| # not a tty or bad/closed fd |
| debug("tty.tcgetattr(pty.STDIN_FILENO) failed") |
| mode = None |
| |
| new_stdin_winsz = None |
| if self.stdin_rows is not None and self.stdin_cols is not None: |
| try: |
| # Modify pty.STDIN_FILENO window size; we need to |
| # check if pty.openpty() is able to set pty slave |
| # window size accordingly. |
| debug("Setting pty.STDIN_FILENO window size") |
| debug(f"original size: (rows={self.stdin_rows}, cols={self.stdin_cols})") |
| target_stdin_rows = self.stdin_rows + 1 |
| target_stdin_cols = self.stdin_cols + 1 |
| debug(f"target size: (rows={target_stdin_rows}, cols={target_stdin_cols})") |
| target_stdin_winsz = struct.pack("HHHH", target_stdin_rows, |
| target_stdin_cols, 0, 0) |
| _set_term_winsz(pty.STDIN_FILENO, target_stdin_winsz) |
| |
| # Were we able to set the window size |
| # of pty.STDIN_FILENO successfully? |
| new_stdin_winsz = _get_term_winsz(pty.STDIN_FILENO) |
| self.assertEqual(new_stdin_winsz, target_stdin_winsz, |
| "pty.STDIN_FILENO window size unchanged") |
| except OSError: |
| warnings.warn("Failed to set pty.STDIN_FILENO window size") |
| pass |
| |
| try: |
| debug("Calling pty.openpty()") |
| try: |
| master_fd, slave_fd = pty.openpty(mode, new_stdin_winsz) |
| except TypeError: |
| master_fd, slave_fd = pty.openpty() |
| debug(f"Got master_fd '{master_fd}', slave_fd '{slave_fd}'") |
| except OSError: |
| # " An optional feature could not be imported " ... ? |
| raise unittest.SkipTest("Pseudo-terminals (seemingly) not functional.") |
| |
| # closing master_fd can raise a SIGHUP if the process is |
| # the session leader: we installed a SIGHUP signal handler |
| # to ignore this signal. |
| self.addCleanup(os.close, master_fd) |
| self.addCleanup(os.close, slave_fd) |
| |
| self.assertTrue(os.isatty(slave_fd), "slave_fd is not a tty") |
| |
| if mode: |
| self.assertEqual(tty.tcgetattr(slave_fd), mode, |
| "openpty() failed to set slave termios") |
| if new_stdin_winsz: |
| self.assertEqual(_get_term_winsz(slave_fd), new_stdin_winsz, |
| "openpty() failed to set slave window size") |
| |
| # Ensure the fd is non-blocking in case there's nothing to read. |
| blocking = os.get_blocking(master_fd) |
| try: |
| os.set_blocking(master_fd, False) |
| try: |
| s1 = os.read(master_fd, 1024) |
| self.assertEqual(b'', s1) |
| except OSError as e: |
| if e.errno != errno.EAGAIN: |
| raise |
| finally: |
| # Restore the original flags. |
| os.set_blocking(master_fd, blocking) |
| |
| debug("Writing to slave_fd") |
| os.write(slave_fd, TEST_STRING_1) |
| s1 = _readline(master_fd) |
| self.assertEqual(b'I wish to buy a fish license.\n', |
| normalize_output(s1)) |
| |
| debug("Writing chunked output") |
| os.write(slave_fd, TEST_STRING_2[:5]) |
| os.write(slave_fd, TEST_STRING_2[5:]) |
| s2 = _readline(master_fd) |
| self.assertEqual(b'For my pet fish, Eric.\n', normalize_output(s2)) |
| |
| def test_fork(self): |
| debug("calling pty.fork()") |
| pid, master_fd = pty.fork() |
| self.addCleanup(os.close, master_fd) |
| if pid == pty.CHILD: |
| # stdout should be connected to a tty. |
| if not os.isatty(1): |
| debug("Child's fd 1 is not a tty?!") |
| os._exit(3) |
| |
| # After pty.fork(), the child should already be a session leader. |
| # (on those systems that have that concept.) |
| debug("In child, calling os.setsid()") |
| try: |
| os.setsid() |
| except OSError: |
| # Good, we already were session leader |
| debug("Good: OSError was raised.") |
| pass |
| except AttributeError: |
| # Have pty, but not setsid()? |
| debug("No setsid() available?") |
| pass |
| except: |
| # We don't want this error to propagate, escaping the call to |
| # os._exit() and causing very peculiar behavior in the calling |
| # regrtest.py ! |
| # Note: could add traceback printing here. |
| debug("An unexpected error was raised.") |
| os._exit(1) |
| else: |
| debug("os.setsid() succeeded! (bad!)") |
| os._exit(2) |
| os._exit(4) |
| else: |
| debug("Waiting for child (%d) to finish." % pid) |
| # In verbose mode, we have to consume the debug output from the |
| # child or the child will block, causing this test to hang in the |
| # parent's waitpid() call. The child blocks after a |
| # platform-dependent amount of data is written to its fd. On |
| # Linux 2.6, it's 4000 bytes and the child won't block, but on OS |
| # X even the small writes in the child above will block it. Also |
| # on Linux, the read() will raise an OSError (input/output error) |
| # when it tries to read past the end of the buffer but the child's |
| # already exited, so catch and discard those exceptions. It's not |
| # worth checking for EIO. |
| while True: |
| try: |
| data = os.read(master_fd, 80) |
| except OSError: |
| break |
| if not data: |
| break |
| sys.stdout.write(str(data.replace(b'\r\n', b'\n'), |
| encoding='ascii')) |
| |
| ##line = os.read(master_fd, 80) |
| ##lines = line.replace('\r\n', '\n').split('\n') |
| ##if False and lines != ['In child, calling os.setsid()', |
| ## 'Good: OSError was raised.', '']: |
| ## raise TestFailed("Unexpected output from child: %r" % line) |
| |
| (pid, status) = os.waitpid(pid, 0) |
| res = os.waitstatus_to_exitcode(status) |
| debug("Child (%d) exited with code %d (status %d)." % (pid, res, status)) |
| if res == 1: |
| self.fail("Child raised an unexpected exception in os.setsid()") |
| elif res == 2: |
| self.fail("pty.fork() failed to make child a session leader.") |
| elif res == 3: |
| self.fail("Child spawned by pty.fork() did not have a tty as stdout") |
| elif res != 4: |
| self.fail("pty.fork() failed for unknown reasons.") |
| |
| ##debug("Reading from master_fd now that the child has exited") |
| ##try: |
| ## s1 = os.read(master_fd, 1024) |
| ##except OSError: |
| ## pass |
| ##else: |
| ## raise TestFailed("Read from master_fd did not raise exception") |
| |
| def test_master_read(self): |
| # XXX(nnorwitz): this test leaks fds when there is an error. |
| debug("Calling pty.openpty()") |
| master_fd, slave_fd = pty.openpty() |
| debug(f"Got master_fd '{master_fd}', slave_fd '{slave_fd}'") |
| |
| self.addCleanup(os.close, master_fd) |
| |
| debug("Closing slave_fd") |
| os.close(slave_fd) |
| |
| debug("Reading from master_fd") |
| try: |
| data = os.read(master_fd, 1) |
| except OSError: # Linux |
| data = b"" |
| |
| self.assertEqual(data, b"") |
| |
| def test_spawn_doesnt_hang(self): |
| pty.spawn([sys.executable, '-c', 'print("hi there")']) |
| |
| class SmallPtyTests(unittest.TestCase): |
| """These tests don't spawn children or hang.""" |
| |
| def setUp(self): |
| self.orig_stdin_fileno = pty.STDIN_FILENO |
| self.orig_stdout_fileno = pty.STDOUT_FILENO |
| self.orig_pty_close = pty.close |
| self.orig_pty__copy = pty._copy |
| self.orig_pty_fork = pty.fork |
| self.orig_pty_select = pty.select |
| self.orig_pty_setraw = pty.setraw |
| self.orig_pty_tcgetattr = pty.tcgetattr |
| self.orig_pty_tcsetattr = pty.tcsetattr |
| self.orig_pty_waitpid = pty.waitpid |
| self.fds = [] # A list of file descriptors to close. |
| self.files = [] |
| self.select_rfds_lengths = [] |
| self.select_rfds_results = [] |
| self.tcsetattr_mode_setting = None |
| |
| def tearDown(self): |
| pty.STDIN_FILENO = self.orig_stdin_fileno |
| pty.STDOUT_FILENO = self.orig_stdout_fileno |
| pty.close = self.orig_pty_close |
| pty._copy = self.orig_pty__copy |
| pty.fork = self.orig_pty_fork |
| pty.select = self.orig_pty_select |
| pty.setraw = self.orig_pty_setraw |
| pty.tcgetattr = self.orig_pty_tcgetattr |
| pty.tcsetattr = self.orig_pty_tcsetattr |
| pty.waitpid = self.orig_pty_waitpid |
| for file in self.files: |
| try: |
| file.close() |
| except OSError: |
| pass |
| for fd in self.fds: |
| try: |
| os.close(fd) |
| except OSError: |
| pass |
| |
| def _pipe(self): |
| pipe_fds = os.pipe() |
| self.fds.extend(pipe_fds) |
| return pipe_fds |
| |
| def _socketpair(self): |
| socketpair = socket.socketpair() |
| self.files.extend(socketpair) |
| return socketpair |
| |
| def _mock_select(self, rfds, wfds, xfds, timeout=0): |
| # This will raise IndexError when no more expected calls exist. |
| # This ignores the timeout |
| self.assertEqual(self.select_rfds_lengths.pop(0), len(rfds)) |
| return self.select_rfds_results.pop(0), [], [] |
| |
| def _make_mock_fork(self, pid): |
| def mock_fork(): |
| return (pid, 12) |
| return mock_fork |
| |
| def _mock_tcsetattr(self, fileno, opt, mode): |
| self.tcsetattr_mode_setting = mode |
| |
| def test__copy_to_each(self): |
| """Test the normal data case on both master_fd and stdin.""" |
| read_from_stdout_fd, mock_stdout_fd = self._pipe() |
| pty.STDOUT_FILENO = mock_stdout_fd |
| mock_stdin_fd, write_to_stdin_fd = self._pipe() |
| pty.STDIN_FILENO = mock_stdin_fd |
| socketpair = self._socketpair() |
| masters = [s.fileno() for s in socketpair] |
| |
| # Feed data. Smaller than PIPEBUF. These writes will not block. |
| os.write(masters[1], b'from master') |
| os.write(write_to_stdin_fd, b'from stdin') |
| |
| # Expect two select calls, the last one will cause IndexError |
| pty.select = self._mock_select |
| self.select_rfds_lengths.append(2) |
| self.select_rfds_results.append([mock_stdin_fd, masters[0]]) |
| self.select_rfds_lengths.append(2) |
| |
| with self.assertRaises(IndexError): |
| pty._copy(masters[0]) |
| |
| # Test that the right data went to the right places. |
| rfds = select.select([read_from_stdout_fd, masters[1]], [], [], 0)[0] |
| self.assertEqual([read_from_stdout_fd, masters[1]], rfds) |
| self.assertEqual(os.read(read_from_stdout_fd, 20), b'from master') |
| self.assertEqual(os.read(masters[1], 20), b'from stdin') |
| |
| def test__copy_eof_on_all(self): |
| """Test the empty read EOF case on both master_fd and stdin.""" |
| read_from_stdout_fd, mock_stdout_fd = self._pipe() |
| pty.STDOUT_FILENO = mock_stdout_fd |
| mock_stdin_fd, write_to_stdin_fd = self._pipe() |
| pty.STDIN_FILENO = mock_stdin_fd |
| socketpair = self._socketpair() |
| masters = [s.fileno() for s in socketpair] |
| |
| socketpair[1].close() |
| os.close(write_to_stdin_fd) |
| |
| pty.select = self._mock_select |
| self.select_rfds_lengths.append(2) |
| self.select_rfds_results.append([mock_stdin_fd, masters[0]]) |
| # We expect that both fds were removed from the fds list as they |
| # both encountered an EOF before the second select call. |
| self.select_rfds_lengths.append(0) |
| |
| # We expect the function to return without error. |
| self.assertEqual(pty._copy(masters[0]), None) |
| |
| def test__restore_tty_mode_normal_return(self): |
| """Test that spawn resets the tty mode no when _copy returns normally.""" |
| |
| # PID 1 is returned from mocked fork to run the parent branch |
| # of code |
| pty.fork = self._make_mock_fork(1) |
| |
| status_sentinel = object() |
| pty.waitpid = lambda _1, _2: [None, status_sentinel] |
| pty.close = lambda _: None |
| |
| pty._copy = lambda _1, _2, _3: None |
| |
| mode_sentinel = object() |
| pty.tcgetattr = lambda fd: mode_sentinel |
| pty.tcsetattr = self._mock_tcsetattr |
| pty.setraw = lambda _: None |
| |
| self.assertEqual(pty.spawn([]), status_sentinel, "pty.waitpid process status not returned by pty.spawn") |
| self.assertEqual(self.tcsetattr_mode_setting, mode_sentinel, "pty.tcsetattr not called with original mode value") |
| |
| |
| def tearDownModule(): |
| reap_children() |
| |
| |
| if __name__ == "__main__": |
| unittest.main() |
