https://github.com/da-viper created https://github.com/llvm/llvm-project/pull/174216
The cause is that in `python3.14`, `fcntl.ioctl` now throws a buffer overflow error when the buffer is too small or too large (see https://github.com/python/cpython/pull/132919). This caused the Python interpreter to fail terminal detection and not properly echo user commands back to the screen. Fix by dropping the custom terminal size check entirely and using the built-in `sys.stdin.isatty()` instead. Fixes #173302 >From 9c15daf3401f7174c6f62b1852a004fab86886ac Mon Sep 17 00:00:00 2001 From: Ebuka Ezike <[email protected]> Date: Fri, 26 Dec 2025 15:03:30 +0000 Subject: [PATCH] [lldb] Fix typed commands not shown on the screen The issue is that in python3.14, `fcntl.ioctl` now throws a buffer overflow error when the buffer is too small (see https://github.com/python/cpython/pull/132919). This caused the Python interpreter to fail terminal detection and not properly echo user commands back to the screen. Fix by dropping the custom terminal size check entirely and using the built-in `sys.stdin.isatty()` instead. Fixes #173302 --- .../Python/lldbsuite/test/lldbpexpect.py | 1 + .../Interpreter/embedded_interpreter.py | 62 +++---------------- .../API/terminal/TestPythonInterpreterEcho.py | 62 +++++++++++++++++++ 3 files changed, 72 insertions(+), 53 deletions(-) create mode 100644 lldb/test/API/terminal/TestPythonInterpreterEcho.py diff --git a/lldb/packages/Python/lldbsuite/test/lldbpexpect.py b/lldb/packages/Python/lldbsuite/test/lldbpexpect.py index 3279e1fd39f8c..03b2500fbda52 100644 --- a/lldb/packages/Python/lldbsuite/test/lldbpexpect.py +++ b/lldb/packages/Python/lldbsuite/test/lldbpexpect.py @@ -10,6 +10,7 @@ @skipIfRemote +@skipIfWindows @add_test_categories(["pexpect"]) class PExpectTest(TestBase): NO_DEBUG_INFO_TESTCASE = True diff --git a/lldb/source/Interpreter/embedded_interpreter.py b/lldb/source/Interpreter/embedded_interpreter.py index 42a9ab5fc367a..5eb582e131871 100644 --- a/lldb/source/Interpreter/embedded_interpreter.py +++ b/lldb/source/Interpreter/embedded_interpreter.py @@ -1,8 +1,6 @@ import sys import builtins import code -import lldb -import traceback try: import readline @@ -31,19 +29,6 @@ def is_libedit(): g_run_one_line_str = None - -def get_terminal_size(fd): - try: - import fcntl - import termios - import struct - - hw = struct.unpack("hh", fcntl.ioctl(fd, termios.TIOCGWINSZ, "1234")) - except: - hw = (0, 0) - return hw - - class LLDBExit(SystemExit): pass @@ -74,50 +59,21 @@ def readfunc_stdio(prompt): def run_python_interpreter(local_dict): # Pass in the dictionary, for continuity from one session to the next. try: - fd = sys.stdin.fileno() - interacted = False - if get_terminal_size(fd)[1] == 0: - try: - import termios - - old = termios.tcgetattr(fd) - if old[3] & termios.ECHO: - # Need to turn off echoing and restore - new = termios.tcgetattr(fd) - new[3] = new[3] & ~termios.ECHO - try: - termios.tcsetattr(fd, termios.TCSADRAIN, new) - interacted = True - code.interact( - banner="Python Interactive Interpreter. To exit, type 'quit()', 'exit()'.", - readfunc=readfunc_stdio, - local=local_dict, - ) - finally: - termios.tcsetattr(fd, termios.TCSADRAIN, old) - except: - pass - # Don't need to turn off echoing - if not interacted: - code.interact( - banner="Python Interactive Interpreter. To exit, type 'quit()', 'exit()' or Ctrl-D.", - readfunc=readfunc_stdio, - local=local_dict, - ) - else: - # We have a real interactive terminal - code.interact( - banner="Python Interactive Interpreter. To exit, type 'quit()', 'exit()' or Ctrl-D.", - readfunc=readfunc, - local=local_dict, - ) + banner = "Python Interactive Interpreter. To exit, type 'quit()', 'exit()'." + input_func = readfunc_stdio + + is_atty = sys.stdin.isatty() + if is_atty: + banner = "Python Interactive Interpreter. To exit, type 'quit()', 'exit()' or Ctrl-D." + input_func = readfunc + + code.interact(banner=banner, readfunc=input_func, local=local_dict) except LLDBExit: pass except SystemExit as e: if e.code: print("Script exited with code %s" % e.code) - def run_one_line(local_dict, input_string): global g_run_one_line_str try: diff --git a/lldb/test/API/terminal/TestPythonInterpreterEcho.py b/lldb/test/API/terminal/TestPythonInterpreterEcho.py new file mode 100644 index 0000000000000..afa8bca2c9be8 --- /dev/null +++ b/lldb/test/API/terminal/TestPythonInterpreterEcho.py @@ -0,0 +1,62 @@ +""" +Test that typing python expression in the terminal is echoed back to stdout. +""" + +from lldbsuite.test.decorators import skipIfAsan +from lldbsuite.test.lldbpexpect import PExpectTest + + +@skipIfAsan +class PythonInterpreterEchoTest(PExpectTest): + PYTHON_PROMPT = ">>> " + + def verify_command_echo( + self, command: str, expected_output: str = "", is_regex: bool = False + ): + assert self.child != None + child = self.child + self.assertIsNotNone(self.child, "expected a running lldb process.") + + child.sendline(command) + + # Build pattern list: match whichever comes first (output or prompt) + # This prevents waiting for a timeout if there's no match + pattern = [] + match_expected = expected_output and len(expected_output) > 0 + + if match_expected: + pattern.append(expected_output) + pattern.append(self.PYTHON_PROMPT) + + expect_func = child.expect if is_regex else child.expect_exact + match_idx = expect_func(pattern) + if match_expected: + self.assertEqual( + match_idx, 0, "Expected output `{expected_output}` in stdout." + ) + + self.assertIsNotNone(self.child.before, "Expected output before prompt") + self.assertIsInstance(self.child.before, bytes) + echoed_text: str = self.child.before.decode("ascii").strip() + self.assertEqual( + command, echoed_text, f"Command '{command}' should be echoed to stdout." + ) + + if match_expected: + child.expect_exact(self.PYTHON_PROMPT) + + def test_python_interpreter_echo(self): + """Test that that the user typed commands is echoed to stdout""" + + self.launch(use_colors=False, dimensions=(100, 100)) + + # enter the python interpreter + self.verify_command_echo( + "script --language python --", expected_output="Python.*\\.", is_regex=True + ) + self.child_in_script_interpreter = True + + self.verify_command_echo("val = 300") + self.verify_command_echo( + "print('result =', 300)", expected_output="result = 300" + ) _______________________________________________ lldb-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
