# showstack.py - extension to dump a Python stack trace on signal

#

# binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)

r"""dump stack trace when receiving SIGQUIT (Ctrl-\) or SIGINFO (Ctrl-T on BSDs)

"""

from __future__ import absolute_import, print_function

import signal

import sys

import traceback

def sigshow(*args):

    sys.stderr.write("\n")

    traceback.print_stack(args[1], limit=10, file=sys.stderr)

    sys.stderr.write("----\n")

def sigexit(*args):

    sigshow(*args)

    print('alarm!')

    sys.exit(1)

def extsetup(ui):

    signal.signal(signal.SIGQUIT, sigshow)

    signal.signal(signal.SIGALRM, sigexit)

    try:

        signal.signal(signal.SIGINFO, sigshow)

    except AttributeError:

        pass