Python pty 模块，STDOUT_FILENO 实例源码

def do_execute(self, stdin_file, stdout_file, stderr_file, cgroup_file):
        pid = fork()
        if not pid:
            chdir('/in/package')
            if stdin_file:
                fd = os_open(stdin_file, O_RDONLY)
                dup2(fd, STDIN_FILENO)
                os_close(fd)
            if stdout_file:
                fd = os_open(stdout_file, O_WRONLY)
                dup2(fd, STDOUT_FILENO)
                os_close(fd)
            if stderr_file:
                fd = os_open(stderr_file, O_WRONLY)
                dup2(fd, STDERR_FILENO)
                os_close(fd)
            if cgroup_file:
                enter_cgroup(cgroup_file)
            execve(self.execute_file, self.execute_args, SPAWN_ENV)
        return wait_and_reap_zombies(pid)

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 = socket.socketpair()
        masters = [s.fileno() for s in socketpair]
        self.fds.extend(masters)

        os.close(masters[1])
        socketpair[1].close()
        os.close(write_to_stdin_fd)

        # 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]])
        # 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)

        with self.assertRaises(IndexError):
            pty._copy(masters[0])

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 = socket.socketpair()
        masters = [s.fileno() for s in socketpair]
        self.fds.extend(masters)

        os.close(masters[1])
        socketpair[1].close()
        os.close(write_to_stdin_fd)

        # 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]])
        # 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)

        with self.assertRaises(IndexError):
            pty._copy(masters[0])

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 = socket.socketpair()
        masters = [s.fileno() for s in socketpair]
        self.fds.extend(masters)

        os.close(masters[1])
        socketpair[1].close()
        os.close(write_to_stdin_fd)

        # 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]])
        # 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)

        with self.assertRaises(IndexError):
            pty._copy(masters[0])

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]

        os.close(masters[1])
        socketpair[1].close()
        os.close(write_to_stdin_fd)

        # 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]])
        # 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)

        with self.assertRaises(IndexError):
            pty._copy(masters[0])

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 = socket.socketpair()
        masters = [s.fileno() for s in socketpair]
        self.fds.extend(masters)

        os.close(masters[1])
        socketpair[1].close()
        os.close(write_to_stdin_fd)

        # 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]])
        # 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)

        with self.assertRaises(IndexError):
            pty._copy(masters[0])

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]

        os.close(masters[1])
        socketpair[1].close()
        os.close(write_to_stdin_fd)

        # 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]])
        # 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)

        with self.assertRaises(IndexError):
            pty._copy(masters[0])

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 = socket.socketpair()
        masters = [s.fileno() for s in socketpair]
        self.fds.extend(masters)

        os.close(masters[1])
        socketpair[1].close()
        os.close(write_to_stdin_fd)

        # 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]])
        # 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)

        with self.assertRaises(IndexError):
            pty._copy(masters[0])

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]

        os.close(masters[1])
        socketpair[1].close()
        os.close(write_to_stdin_fd)

        # 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]])
        # 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)

        with self.assertRaises(IndexError):
            pty._copy(masters[0])

def __interact_copy(self, escape_character=None, input_filter=None, output_filter=None):
        """This is used by the interact() method.
        """

        while self.isalive():
            r, w, e = self.__select([self.child_fd, self.STDIN_FILENO], [], [])
            if self.child_fd in r:
                data = self.__interact_read(self.child_fd)
                if output_filter:
                    data = output_filter(data)
                if self.logfile is not None:
                    self.logfile.write(data)
                    self.logfile.flush()
                os.write(self.STDOUT_FILENO, data)
            if self.STDIN_FILENO in r:
                data = self.__interact_read(self.STDIN_FILENO)
                if input_filter:
                    data = input_filter(data)
                i = data.rfind(escape_character)
                if i != -1:
                    data = data[:i]
                    self.__interact_writen(self.child_fd, data)
                    break
                self.__interact_writen(self.child_fd, data)

def _signal_winch(self, signum, frame):
        if self.set_pty_size is not None:
            buf = array.array('h', [0, 0, 0, 0])
            fcntl.ioctl(pty.STDOUT_FILENO, termios.TIOCGWINSZ, buf, True)
            self.set_pty_size(buf[0], buf[1], buf[2], buf[3])

def set_pty_size(self, p1, p2, p3, p4):
        buf = array.array('h', [p1, p2, p3, p4])
        #fcntl.ioctl(pty.STDOUT_FILENO, termios.TIOCSWINSZ, buf)
        fcntl.ioctl(self.master, termios.TIOCSWINSZ, buf)

def __interact_copy(self, escape_character=None,
            input_filter=None, output_filter=None):

        '''This is used by the interact() method.
        '''

        while self.isalive():
            r, w, e = select_ignore_interrupts([self.child_fd, self.STDIN_FILENO], [], [])
            if self.child_fd in r:
                try:
                    data = self.__interact_read(self.child_fd)
                except OSError as err:
                    if err.args[0] == errno.EIO:
                        # Linux-style EOF
                        break
                    raise
                if data == b'':
                    # BSD-style EOF
                    break
                if output_filter:
                    data = output_filter(data)
                self._log(data, 'read')
                os.write(self.STDOUT_FILENO, data)
            if self.STDIN_FILENO in r:
                data = self.__interact_read(self.STDIN_FILENO)
                if input_filter:
                    data = input_filter(data)
                i = -1
                if escape_character is not None:
                    i = data.rfind(escape_character)
                if i != -1:
                    data = data[:i]
                    if data:
                        self._log(data, 'send')
                    self.__interact_writen(self.child_fd, data)
                    break
                self._log(data, 'send')
                self.__interact_writen(self.child_fd, data)

def do_build(self, output_file, cgroup_file):
        pid = fork()
        if not pid:
            chdir('/out')
            os_close(STDIN_FILENO)
            if output_file:
                fd = os_open(output_file, O_WRONLY)
                dup2(fd, STDOUT_FILENO)
                dup2(fd, STDERR_FILENO)
                os_close(fd)
            if cgroup_file:
                enter_cgroup(cgroup_file)
            execve(self.compiler_file, self.compiler_args, SPAWN_ENV)
        return wait_and_reap_zombies(pid)

def _signal_winch(self, signum, frame):
        if self.set_pty_size is not None:
            buf = array.array('h', [0, 0, 0, 0])
            fcntl.ioctl(pty.STDOUT_FILENO, termios.TIOCGWINSZ, buf, True)
            self.set_pty_size(buf[0], buf[1], buf[2], buf[3])

def set_pty_size(self, p1, p2, p3, p4):
        buf = array.array('h', [p1, p2, p3, p4])
        #fcntl.ioctl(pty.STDOUT_FILENO, termios.TIOCSWINSZ, buf)
        fcntl.ioctl(self.master, termios.TIOCSWINSZ, buf)

def __interact_copy(self, escape_character=None,
            input_filter=None, output_filter=None):

        '''This is used by the interact() method.
        '''

        while self.isalive():
            r, w, e = select_ignore_interrupts([self.child_fd, self.STDIN_FILENO], [], [])
            if self.child_fd in r:
                try:
                    data = self.__interact_read(self.child_fd)
                except OSError as err:
                    if err.args[0] == errno.EIO:
                        # Linux-style EOF
                        break
                    raise
                if data == b'':
                    # BSD-style EOF
                    break
                if output_filter:
                    data = output_filter(data)
                self._log(data, 'read')
                os.write(self.STDOUT_FILENO, data)
            if self.STDIN_FILENO in r:
                data = self.__interact_read(self.STDIN_FILENO)
                if input_filter:
                    data = input_filter(data)
                i = -1
                if escape_character is not None:
                    i = data.rfind(escape_character)
                if i != -1:
                    data = data[:i]
                    if data:
                        self._log(data, 'send')
                    self.__interact_writen(self.child_fd, data)
                    break
                self._log(data, 'send')
                self.__interact_writen(self.child_fd, data)

def setUp(self):
        self.orig_stdin_fileno = pty.STDIN_FILENO
        self.orig_stdout_fileno = pty.STDOUT_FILENO
        self.orig_pty_select = pty.select
        self.fds = []  # A list of file descriptors to close.
        self.select_rfds_lengths = []
        self.select_rfds_results = []

def tearDown(self):
        pty.STDIN_FILENO = self.orig_stdin_fileno
        pty.STDOUT_FILENO = self.orig_stdout_fileno
        pty.select = self.orig_pty_select
        for fd in self.fds:
            try:
                os.close(fd)
            except:
                pass

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 = socket.socketpair()
        masters = [s.fileno() for s in socketpair]
        self.fds.extend(masters)

        # 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 setUp(self):
        self.orig_stdin_fileno = pty.STDIN_FILENO
        self.orig_stdout_fileno = pty.STDOUT_FILENO
        self.orig_pty_select = pty.select
        self.fds = []  # A list of file descriptors to close.
        self.select_rfds_lengths = []
        self.select_rfds_results = []

def tearDown(self):
        pty.STDIN_FILENO = self.orig_stdin_fileno
        pty.STDOUT_FILENO = self.orig_stdout_fileno
        pty.select = self.orig_pty_select
        for fd in self.fds:
            try:
                os.close(fd)
            except:
                pass

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 = socket.socketpair()
        masters = [s.fileno() for s in socketpair]
        self.fds.extend(masters)

        # 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 setUp(self):
        self.orig_stdin_fileno = pty.STDIN_FILENO
        self.orig_stdout_fileno = pty.STDOUT_FILENO
        self.orig_pty_select = pty.select
        self.fds = []  # A list of file descriptors to close.
        self.select_rfds_lengths = []
        self.select_rfds_results = []

def tearDown(self):
        pty.STDIN_FILENO = self.orig_stdin_fileno
        pty.STDOUT_FILENO = self.orig_stdout_fileno
        pty.select = self.orig_pty_select
        for fd in self.fds:
            try:
                os.close(fd)
            except:
                pass

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 = socket.socketpair()
        masters = [s.fileno() for s in socketpair]
        self.fds.extend(masters)

        # 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 setUp(self):
        self.orig_stdin_fileno = pty.STDIN_FILENO
        self.orig_stdout_fileno = pty.STDOUT_FILENO
        self.orig_pty_select = pty.select
        self.fds = []  # A list of file descriptors to close.
        self.files = []
        self.select_rfds_lengths = []
        self.select_rfds_results = []

def tearDown(self):
        pty.STDIN_FILENO = self.orig_stdin_fileno
        pty.STDOUT_FILENO = self.orig_stdout_fileno
        pty.select = self.orig_pty_select
        for file in self.files:
            try:
                file.close()
            except OSError:
                pass
        for fd in self.fds:
            try:
                os.close(fd)
            except OSError:
                pass

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 _write_stdout(self, data):
        assert isinstance(data, bytes), '`data` must be a bytes'
        os.write(pty.STDOUT_FILENO, data)

def _set_pty_size(self):
        '''
        Sets the window size of the child pty based on the window size of our own controlling terminal.
        '''
        assert self.master_fd is not None

        # Get the terminal size of the real terminal, set it on the pseudoterminal.
        buf = array.array('h', [0, 0, 0, 0])
        fcntl.ioctl(pty.STDOUT_FILENO, termios.TIOCGWINSZ, buf, True)
        fcntl.ioctl(self.master_fd, termios.TIOCSWINSZ, buf)

def _set_pty_size(self):
        '''
        Sets the window size of the child pty based on the window size of our own controlling terminal.
        '''
        assert self.master_fd is not None

        # Get the terminal size of the real terminal, set it on the pseudoterminal.
        rows, cols = self.size
        buf = array.array('h', [cols, rows, 0, 0])
        #fcntl.ioctl(pty.STDOUT_FILENO, termios.TIOCGWINSZ, buf, True)
        fcntl.ioctl(self.master_fd, termios.TIOCSWINSZ, buf)

def write_stdout(self, data):
        '''
        Writes to stdout as if the child process had written the data.
        '''

        #os.write(pty.STDOUT_FILENO, data)

def __fork_pty(self):
        '''This implements a substitute for the forkpty system call. This
        should be more portable than the pty.fork() function. Specifically,
        this should work on Solaris.

        Modified 10.06.05 by Geoff Marshall: Implemented __fork_pty() method to
        resolve the issue with Python's pty.fork() not supporting Solaris,
        particularly ssh. Based on patch to posixmodule.c authored by Noah
        Spurrier::

            http://mail.python.org/pipermail/python-dev/2003-May/035281.html

        '''

        parent_fd, child_fd = os.openpty()
        if parent_fd < 0 or child_fd < 0:
            raise ExceptionPexpect("Could not open with os.openpty().")

        pid = os.fork()
        if pid == pty.CHILD:
            # Child.
            os.close(parent_fd)
            self.__pty_make_controlling_tty(child_fd)

            os.dup2(child_fd, self.STDIN_FILENO)
            os.dup2(child_fd, self.STDOUT_FILENO)
            os.dup2(child_fd, self.STDERR_FILENO)

        else:
            # Parent.
            os.close(child_fd)

        return pid, parent_fd

def __interact_copy(self, escape_character=None,
            input_filter=None, output_filter=None):

        '''This is used by the interact() method.
        '''

        while self.isalive():
            r, w, e = self.__select([self.child_fd, self.STDIN_FILENO], [], [])
            if self.child_fd in r:
                try:
                    data = self.__interact_read(self.child_fd)
                except OSError as err:
                    if err.args[0] == errno.EIO:
                        # Linux-style EOF
                        break
                    raise
                if data == b'':
                    # BSD-style EOF
                    break
                if output_filter:
                    data = output_filter(data)
                if self.logfile is not None:
                    self.logfile.write(data)
                    self.logfile.flush()
                os.write(self.STDOUT_FILENO, data)
            if self.STDIN_FILENO in r:
                data = self.__interact_read(self.STDIN_FILENO)
                if input_filter:
                    data = input_filter(data)
                i = data.rfind(escape_character)
                if i != -1:
                    data = data[:i]
                    self.__interact_writen(self.child_fd, data)
                    break
                self.__interact_writen(self.child_fd, data)

def __interact_copy(self, escape_character=None,
            input_filter=None, output_filter=None):

        '''This is used by the interact() method.
        '''

        while self.isalive():
            r, w, e = select_ignore_interrupts([self.child_fd, self.STDIN_FILENO], [], [])
            if self.child_fd in r:
                try:
                    data = self.__interact_read(self.child_fd)
                except OSError as err:
                    if err.args[0] == errno.EIO:
                        # Linux-style EOF
                        break
                    raise
                if data == b'':
                    # BSD-style EOF
                    break
                if output_filter:
                    data = output_filter(data)
                self._log(data, 'read')
                os.write(self.STDOUT_FILENO, data)
            if self.STDIN_FILENO in r:
                data = self.__interact_read(self.STDIN_FILENO)
                if input_filter:
                    data = input_filter(data)
                i = -1
                if escape_character is not None:
                    i = data.rfind(escape_character)
                if i != -1:
                    data = data[:i]
                    if data:
                        self._log(data, 'send')
                    self.__interact_writen(self.child_fd, data)
                    break
                self._log(data, 'send')
                self.__interact_writen(self.child_fd, data)

def setUp(self):
        self.orig_stdin_fileno = pty.STDIN_FILENO
        self.orig_stdout_fileno = pty.STDOUT_FILENO
        self.orig_pty_select = pty.select
        self.fds = []  # A list of file descriptors to close.
        self.select_rfds_lengths = []
        self.select_rfds_results = []

def tearDown(self):
        pty.STDIN_FILENO = self.orig_stdin_fileno
        pty.STDOUT_FILENO = self.orig_stdout_fileno
        pty.select = self.orig_pty_select
        for fd in self.fds:
            try:
                os.close(fd)
            except:
                pass

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 = socket.socketpair()
        masters = [s.fileno() for s in socketpair]
        self.fds.extend(masters)

        # 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 __interact_copy(self, escape_character=None,
            input_filter=None, output_filter=None):

        '''This is used by the interact() method.
        '''

        while self.isalive():
            r, w, e = select_ignore_interrupts([self.child_fd, self.STDIN_FILENO], [], [])
            if self.child_fd in r:
                try:
                    data = self.__interact_read(self.child_fd)
                except OSError as err:
                    if err.args[0] == errno.EIO:
                        # Linux-style EOF
                        break
                    raise
                if data == b'':
                    # BSD-style EOF
                    break
                if output_filter:
                    data = output_filter(data)
                self._log(data, 'read')
                os.write(self.STDOUT_FILENO, data)
            if self.STDIN_FILENO in r:
                data = self.__interact_read(self.STDIN_FILENO)
                if input_filter:
                    data = input_filter(data)
                i = -1
                if escape_character is not None:
                    i = data.rfind(escape_character)
                if i != -1:
                    data = data[:i]
                    if data:
                        self._log(data, 'send')
                    self.__interact_writen(self.child_fd, data)
                    break
                self._log(data, 'send')
                self.__interact_writen(self.child_fd, data)

def setUp(self):
        self.orig_stdin_fileno = pty.STDIN_FILENO
        self.orig_stdout_fileno = pty.STDOUT_FILENO
        self.orig_pty_select = pty.select
        self.fds = []  # A list of file descriptors to close.
        self.files = []
        self.select_rfds_lengths = []
        self.select_rfds_results = []

def tearDown(self):
        pty.STDIN_FILENO = self.orig_stdin_fileno
        pty.STDOUT_FILENO = self.orig_stdout_fileno
        pty.select = self.orig_pty_select
        for file in self.files:
            try:
                file.close()
            except OSError:
                pass
        for fd in self.fds:
            try:
                os.close(fd)
            except OSError:
                pass

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 setUp(self):
        self.orig_stdin_fileno = pty.STDIN_FILENO
        self.orig_stdout_fileno = pty.STDOUT_FILENO
        self.orig_pty_select = pty.select
        self.fds = []  # A list of file descriptors to close.
        self.select_rfds_lengths = []
        self.select_rfds_results = []

def tearDown(self):
        pty.STDIN_FILENO = self.orig_stdin_fileno
        pty.STDOUT_FILENO = self.orig_stdout_fileno
        pty.select = self.orig_pty_select
        for fd in self.fds:
            try:
                os.close(fd)
            except:
                pass

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 = socket.socketpair()
        masters = [s.fileno() for s in socketpair]
        self.fds.extend(masters)

        # 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 __fork_pty(self):
        '''This implements a substitute for the forkpty system call. This
        should be more portable than the pty.fork() function. Specifically,
        this should work on Solaris.

        Modified 10.06.05 by Geoff Marshall: Implemented __fork_pty() method to
        resolve the issue with Python's pty.fork() not supporting Solaris,
        particularly ssh. Based on patch to posixmodule.c authored by Noah
        Spurrier::

            http://mail.python.org/pipermail/python-dev/2003-May/035281.html

        '''

        parent_fd, child_fd = os.openpty()
        if parent_fd < 0 or child_fd < 0:
            raise ExceptionPexpect("Could not open with os.openpty().")

        pid = os.fork()
        if pid == pty.CHILD:
            # Child.
            os.close(parent_fd)
            self.__pty_make_controlling_tty(child_fd)

            os.dup2(child_fd, self.STDIN_FILENO)
            os.dup2(child_fd, self.STDOUT_FILENO)
            os.dup2(child_fd, self.STDERR_FILENO)

        else:
            # Parent.
            os.close(child_fd)

        return pid, parent_fd

def __interact_copy(self, escape_character=None,
            input_filter=None, output_filter=None):

        '''This is used by the interact() method.
        '''

        while self.isalive():
            r, w, e = self.__select([self.child_fd, self.STDIN_FILENO], [], [])
            if self.child_fd in r:
                try:
                    data = self.__interact_read(self.child_fd)
                except OSError as err:
                    if err.args[0] == errno.EIO:
                        # Linux-style EOF
                        break
                    raise
                if data == b'':
                    # BSD-style EOF
                    break
                if output_filter:
                    data = output_filter(data)
                if self.logfile is not None:
                    self.logfile.write(data)
                    self.logfile.flush()
                os.write(self.STDOUT_FILENO, data)
            if self.STDIN_FILENO in r:
                data = self.__interact_read(self.STDIN_FILENO)
                if input_filter:
                    data = input_filter(data)
                i = data.rfind(escape_character)
                if i != -1:
                    data = data[:i]
                    self.__interact_writen(self.child_fd, data)
                    break
                self.__interact_writen(self.child_fd, data)

def _set_pty_size(self):
        """Sets the window size of the child pty based on the window size of 
        our own controlling terminal.
        """
        assert self.master_fd is not None
        # Get the terminal size of the real terminal, set it on the
        #       pseudoterminal.
        buf = array.array('h', [0, 0, 0, 0])
        fcntl.ioctl(pty.STDOUT_FILENO, termios.TIOCGWINSZ, buf, True)
        fcntl.ioctl(self.master_fd, termios.TIOCSWINSZ, buf)

def write_stdout(self, data):
        """Writes to stdout as if the child process had written the data (bytes)."""
        os.write(pty.STDOUT_FILENO, data)  # write to real terminal
        # tee to buffer
        data = self._sanatize_data(data)
        if len(data) > 0:
            self.buffer.write(data)