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# host/utils - Host utilities. {{{
#
# Copyright (C) 2008 Nicolas Schodet
#
# APBTeam:
#        Web: http://apbteam.org/
#      Email: team AT apbteam DOT org
#
# 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# }}}
"""Run a function in a separate process."""
import os, sys, signal

class Forked:
    """
    Usage:

    >>> f = Forked (function)
    (function runs in background, in a separated process)
    >>> f.kill ()
    (send the SIGTERM signal to the process)
    """

    def __init__ (self, function):
        """Initialise, fork, and call the given function in the children
        process."""
        self.pid = os.fork ()
        if self.pid == 0:
            function ()
            sys.exit (0)

    def kill (self):
        """Kill the forked function."""
        os.kill (self.pid, signal.SIGTERM)
        os.waitpid (self.pid, 0)