Viewing file:  signal_handler.py (1.74 KB) -rw-r--r--
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# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
import inspect
import logging
import signal
import sys
from io import StringIO
from cloudinit import util
from cloudinit import version as vr
LOG = logging.getLogger(__name__)
BACK_FRAME_TRACE_DEPTH = 3
EXIT_FOR = {
signal.SIGINT: ("Cloud-init %(version)s received SIGINT, exiting...", 1),
signal.SIGTERM: ("Cloud-init %(version)s received SIGTERM, exiting...", 1),
# Can't be caught...
# signal.SIGKILL: ('Cloud-init killed, exiting...', 1),
signal.SIGABRT: ("Cloud-init %(version)s received SIGABRT, exiting...", 1),
}
def _pprint_frame(frame, depth, max_depth, contents):
if depth > max_depth or not frame:
return
frame_info = inspect.getframeinfo(frame)
prefix = " " * (depth * 2)
contents.write("%sFilename: %s\n" % (prefix, frame_info.filename))
contents.write("%sFunction: %s\n" % (prefix, frame_info.function))
contents.write("%sLine number: %s\n" % (prefix, frame_info.lineno))
_pprint_frame(frame.f_back, depth + 1, max_depth, contents)
def _handle_exit(signum, frame):
(msg, rc) = EXIT_FOR[signum]
msg = msg % ({"version": vr.version_string()})
contents = StringIO()
contents.write("%s\n" % (msg))
_pprint_frame(frame, 1, BACK_FRAME_TRACE_DEPTH, contents)
util.multi_log(contents.getvalue(), log=LOG, log_level=logging.ERROR)
sys.exit(rc)
def attach_handlers():
sigs_attached = 0
for signum in EXIT_FOR.keys():
signal.signal(signum, _handle_exit)
sigs_attached += len(EXIT_FOR)
return sigs_attached
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