Inspecting Stack Trace of a Running Python Application
When a Python application unexpectedly hangs, it can be challenging to determine the source of the issue. Fortunately, there are techniques to obtain a stack trace of the running application, allowing you to pinpoint the specific code being executed when the application halts.
Using a Custom Signal Handler
One method to show a stack trace is to use a custom signal handler. This technique involves sending a signal to the running application, triggering the handler to capture the stack trace and display it interactively. Below is an example using the debug function:
<code class="python">import code, traceback, signal def debug(sig, frame): d={'_frame':frame} d.update(frame.f_globals) d.update(frame.f_locals) i = code.InteractiveConsole(d) message = "Signal received : entering python shell.\nTraceback:\n" message += ''.join(traceback.format_stack(frame)) i.interact(message) def listen(): signal.signal(signal.SIGUSR1, debug) </code>
Once the listen() function is invoked, sending a SIGUSR1 signal to the process using os.kill or kill will interrupt the running application, providing a Python console with the stack trace.
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