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71a91197fa
See PEP 328[1] for details. This feature was introduced in Python 2.5 and will become mandatory in Python 3. [1]: http://www.python.org/dev/peps/pep-0328 (imported from commit 7444eeba8a08d5f91b94c7921848f2274979bd76)
29 lines
1.1 KiB
Python
29 lines
1.1 KiB
Python
from __future__ import absolute_import
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import code
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import traceback
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import signal
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# Interactive debugging code from
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# http://stackoverflow.com/questions/132058/showing-the-stack-trace-from-a-running-python-application
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# (that link also points to code for an interactive remote debugger
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# setup, which we might want if we move Tornado to run in a daemon
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# rather than via screen).
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def interactive_debug(sig, frame):
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"""Interrupt running process, and provide a python prompt for
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interactive debugging."""
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d={'_frame':frame} # Allow access to frame object.
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d.update(frame.f_globals) # Unless shadowed by global
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d.update(frame.f_locals)
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message = "Signal recieved : entering python shell.\nTraceback:\n"
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message += ''.join(traceback.format_stack(frame))
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i = code.InteractiveConsole(d)
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i.interact(message)
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# SIGUSR1 => Just print the stack
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# SIGUSR2 => Print stack + open interactive debugging shell
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def interactive_debug_listen():
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signal.signal(signal.SIGUSR1, lambda sig, stack: traceback.print_stack(stack))
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signal.signal(signal.SIGUSR2, interactive_debug)
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