"""SCons.exitfuncs

Register functions which are executed when SCons exits for any reason.

"""

#
# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007 The SCons Foundation
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# "Software"), to deal in the Software without restriction, including
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# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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__revision__ = "/home/scons/scons/branch.0/baseline/src/engine/SCons/exitfuncs.py 0.97.D001 2007/05/17 11:35:19 knight"



_exithandlers = []
def _run_exitfuncs():
    """run any registered exit functions

    _exithandlers is traversed in reverse order so functions are executed
    last in, first out.
    """

    while _exithandlers:
        func, targs, kargs =  _exithandlers.pop()
        apply(func, targs, kargs)

def register(func, *targs, **kargs):
    """register a function to be executed upon normal program termination

    func - function to be called at exit
    targs - optional arguments to pass to func
    kargs - optional keyword arguments to pass to func
    """
    _exithandlers.append((func, targs, kargs))

import sys

try:
    x = sys.exitfunc

    # if x isn't our own exit func executive, assume it's another
    # registered exit function - append it to our list...
    if x != _run_exitfuncs:
        register(x)

except AttributeError:
    pass

# make our exit function get run by python when it exits:    
sys.exitfunc = _run_exitfuncs

del sys