[va000612]

What does this PR do?

salt-run state.event (and salt-call state.event) printed a traceback and reported the runner as failed when stopped with Ctrl+C.

salt-run installs a SIGINT handler (salt/scripts.py::_handle_signals) that calls sys.exit(). That SystemExit is raised while state.event is blocked inside sevent.get_event(), in the tornado/asyncio selector poll. Nothing in the loop caught it, so it propagated up to salt.client.mixins.low, which reported Exception occurred in runner state.event: Traceback ... SystemExit: 0 with retcode: 1.

This wraps the loop in try/except (KeyboardInterrupt, SystemExit) so the command stops quietly. The event bus is still closed by the surrounding with get_event(...) block.

What issues does this PR fix or reference?

Fixes #59618

Previous Behavior

Pressing Ctrl+C during salt-run state.event pretty=True printed Exiting gracefully on Ctrl-c followed by a traceback ending in SystemExit: 0, and the runner returned success: False, retcode: 1.

New Behavior

Ctrl+C prints only Exiting gracefully on Ctrl-c and the command ends without a traceback. count=N and event printing are unchanged.

Merge requirements satisfied?

• Docs: no docs change needed
• Changelog: changelog/59618.fixed.md
• Tests written/updated: test_event_exits_cleanly_on_interrupt (parametrized over KeyboardInterrupt and SystemExit)

Testing

Unit tests (repo .venv, Python 3.14):

.venv/bin/python -m pytest tests/pytests/unit/modules/state/test_state.py -k test_event -q -p no:cacheprovider

• Without the fix: the KeyboardInterrupt case escapes state.event and aborts the pytest session.
• With the fix: 3 passed (existing test_event plus both new cases).
  Before:

After:

Real master (master, Salt 3008.4, Python 3.11, minion connected):

timeout -s INT 6 salt-run -c /root/repro/master state.event pretty=True >out.txt 2>err.txt
grep -c "Exception occurred in runner" err.txt

	Exception occurred in runner	stderr
Before (stock 3008.4)	1	traceback ending in SystemExit: 0, retcode: 1
After (patched salt/modules/state.py)	0	only Exiting gracefully on Ctrl-c

(timeout exit code 124 is expected in both cases.)

Regression check on the same master:

salt-run -c /root/repro/master state.event 'test/*' count=1 &
salt-run -c /root/repro/master event.send test/tag '{"a": 1}'

The listener printed test/tag {"a": 1, "_stamp": ...} and exited on its own.

Note: lint-salt, lint-tests and check-changelog-entries pre-commit hooks were skipped locally because of local environment problems (unresolvable pinned requirement, no py3.15 changelog lock). Please rely on CI for those.