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.venv2/Lib/site-packages/_pytest/faulthandler.py

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+import os
+import sys
+from typing import Generator
+
+import pytest
+from _pytest.config import Config
+from _pytest.config.argparsing import Parser
+from _pytest.nodes import Item
+from _pytest.stash import StashKey
+
+
+fault_handler_original_stderr_fd_key = StashKey[int]()
+fault_handler_stderr_fd_key = StashKey[int]()
+
+
+def pytest_addoption(parser: Parser) -> None:
+    help = (
+        "Dump the traceback of all threads if a test takes "
+        "more than TIMEOUT seconds to finish"
+    )
+    parser.addini("faulthandler_timeout", help, default=0.0)
+
+
+def pytest_configure(config: Config) -> None:
+    import faulthandler
+
+    # at teardown we want to restore the original faulthandler fileno
+    # but faulthandler has no api to return the original fileno
+    # so here we stash the stderr fileno to be used at teardown
+    # sys.stderr and sys.__stderr__ may be closed or patched during the session
+    # so we can't rely on their values being good at that point (#11572).
+    stderr_fileno = get_stderr_fileno()
+    if faulthandler.is_enabled():
+        config.stash[fault_handler_original_stderr_fd_key] = stderr_fileno
+    config.stash[fault_handler_stderr_fd_key] = os.dup(stderr_fileno)
+    faulthandler.enable(file=config.stash[fault_handler_stderr_fd_key])
+
+
+def pytest_unconfigure(config: Config) -> None:
+    import faulthandler
+
+    faulthandler.disable()
+    # Close the dup file installed during pytest_configure.
+    if fault_handler_stderr_fd_key in config.stash:
+        os.close(config.stash[fault_handler_stderr_fd_key])
+        del config.stash[fault_handler_stderr_fd_key]
+    # Re-enable the faulthandler if it was originally enabled.
+    if fault_handler_original_stderr_fd_key in config.stash:
+        faulthandler.enable(config.stash[fault_handler_original_stderr_fd_key])
+        del config.stash[fault_handler_original_stderr_fd_key]
+
+
+def get_stderr_fileno() -> int:
+    try:
+        fileno = sys.stderr.fileno()
+        # The Twisted Logger will return an invalid file descriptor since it is not backed
+        # by an FD. So, let's also forward this to the same code path as with pytest-xdist.
+        if fileno == -1:
+            raise AttributeError()
+        return fileno
+    except (AttributeError, ValueError):
+        # pytest-xdist monkeypatches sys.stderr with an object that is not an actual file.
+        # https://docs.python.org/3/library/faulthandler.html#issue-with-file-descriptors
+        # This is potentially dangerous, but the best we can do.
+        return sys.__stderr__.fileno()
+
+
+def get_timeout_config_value(config: Config) -> float:
+    return float(config.getini("faulthandler_timeout") or 0.0)
+
+
+@pytest.hookimpl(wrapper=True, trylast=True)
+def pytest_runtest_protocol(item: Item) -> Generator[None, object, object]:
+    timeout = get_timeout_config_value(item.config)
+    if timeout > 0:
+        import faulthandler
+
+        stderr = item.config.stash[fault_handler_stderr_fd_key]
+        faulthandler.dump_traceback_later(timeout, file=stderr)
+        try:
+            return (yield)
+        finally:
+            faulthandler.cancel_dump_traceback_later()
+    else:
+        return (yield)
+
+
+@pytest.hookimpl(tryfirst=True)
+def pytest_enter_pdb() -> None:
+    """Cancel any traceback dumping due to timeout before entering pdb."""
+    import faulthandler
+
+    faulthandler.cancel_dump_traceback_later()
+
+
+@pytest.hookimpl(tryfirst=True)
+def pytest_exception_interact() -> None:
+    """Cancel any traceback dumping due to an interactive exception being
+    raised."""
+    import faulthandler
+
+    faulthandler.cancel_dump_traceback_later()