add signal handling to libci

[AviaAv]

Tracked on: [LRS-1260]

[Copilot]

Pull Request Overview

Adds centralized signal handling to ensure proper hub disconnection on interrupts and refactors existing cleanup logic.

• Introduces register_signal_handlers for SIGINT/SIGTERM cleanup callbacks
• Extracts hub disconnection into close_hubs() and hooks it into signal handling
• Automatically re-registers handlers after hub methods via __getattribute__ and in port operations

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
unit-tests/run-unit-tests.py	Imported register_signal_handlers, factored out hub cleanup to close_hubs(), and wired up handlers
unit-tests/py/rspy/signals.py	New module defining register_signal_handlers and default abort handler
unit-tests/py/rspy/device_hub.py	Overrides __getattribute__ to wrap hub methods, re-registering signal handlers
unit-tests/py/rspy/acroname.py	Added re-registration calls in enable_ports and disable_ports after sleeps

Comments suppressed due to low confidence (2)

unit-tests/run-unit-tests.py:520

• There are no unit tests verifying that register_signal_handlers correctly invokes close_hubs on SIGINT/SIGTERM. Add tests that simulate these signals and confirm resource cleanup.

register_signal_handlers(close_hubs)

unit-tests/run-unit-tests.py:499

• The function close_hubs references devices but there’s no import in this scope, leading to a NameError at runtime. Consider importing devices at the top or within close_hubs.

def close_hubs():

[Copilot]

[nitpick] Overriding __getattribute__ to wrap all method calls can introduce performance overhead and reduce readability. Consider explicitly invoking register_signal_handlers in critical methods instead of a blanket override.

Suggested change

	def __getattribute__(self, name):
	attr = super().__getattribute__(name)
	# some hubs override / clear signals, this is used to re-register them, only for methods for now
	if callable(attr) and not name.startswith('__'):
	def wrapper(*args, **kwargs):
	result = attr(*args, **kwargs)
	signals.register_signal_handlers()
	return result
	return wrapper
	return attr # Return non-methods or special methods as-is
	# Removed the __getattribute__ method as it introduces performance overhead and reduces readability.

[Copilot]

[nitpick] Calling register_signal_handlers on every port enable/disable may incur unnecessary overhead. Consider moving handler registration to initialization rather than inside each method.

Suggested change

signals.register_signal_handlers()