~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2006, 2007 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

import os

import signal

def _debug(signal_number, interrupted_frame):

    import pdb

    import sys

    sys.stderr.write("** SIGQUIT received, entering debugger\n"

            "** Type 'c' to continue or 'q' to stop the process\n"

            "** Or SIGQUIT again to quit (and possibly dump core)\n"

            )

    # restore default meaning so that you can kill the process by hitting it

    # twice

    signal.signal(signal.SIGQUIT, signal.SIG_DFL)

    try:

        pdb.set_trace()

    finally:

        signal.signal(signal.SIGQUIT, _debug)

def hook_sigquit():

    # when sigquit (C-\) is received go into pdb

    if (os.environ.get('BZR_SIGQUIT_PDB', '1') == '0'

        or getattr(signal, 'SIGQUIT', None) is None):

        return

    signal.signal(signal.SIGQUIT, _debug)