Added helper functions for logging fatal error in ForkedJob

import signal

import subprocess

import sys

import traceback

from threading import Thread, Event

from StringIO import StringIO

from cloudcontrol.node.exc import JobError

from cloudcontrol.node.utils import num_to_sig

        # overide in sub class

        pass

    def fatal(self, fmt, *args, **kwargs):

        """Write error message in stderr and exit.

        :param str fmt: format string

        :param \*args: arguments for format string

        :param \*\*kwargs: can contain ('status', :int:) -> exit status of process

        """

        try:

            status = int(kwargs.get('status', 1))

        except (ValueError, TypeError):

            sys.stderr.write('Bad status argument %s' % status)

            os._exit(42)

        try:

            fmt = fmt % args

        except (ValueError, TypeError):

            sys.stderr.write('Bad formatting for string: %s' % fmt)

            os._exit(42)

        try:

            sys.stderr.write(fmt)

        except IOError:

            os._exit(42)

        os._exit(status)

    def fatal_exc(self, fmt, *args, **kwargs):

        """Write error message and traceback and exit.

        :param str fmt: format string

        :param \*args: arguments for format string

        :param \*\*kwargs: can contain ('status', :int:) -> exit status of process

        """

        tb = StringIO()

        tb.write('\n')

        traceback.print_exc(file=tb)

        tb.write('\n')

        fmt += '%s'

        args = args + (tb.getvalue(),)

        self.fatal(fmt, *args, status=kwargs.get('status', 1))

    def close_fds(self):

        """Close all fds uneeded fds in children."""

        # get max fd