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# Copyright (c) 2002-2011 IronPort Systems and Cisco Systems
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, 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 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# $Header: //prod/main/ap/shrapnel/coro/signal_handler.py#8 $
"""Signal handler."""
import coro
import signal
import os
UNAME = os.uname()[0]
def register (signum, handler, once_only=False):
"""Register a signal handler.
:Parameters:
- `signum`: The signal number to register.
- `handler`: A callable object that takes one parameter which is the
signal number that was triggered.
- `once_only`: If True, will only trigger once, and then disable the
signal handler. [kqueue only]. Defaults to False.
:Exceptions:
- `coro.SimultaneousError`: Another handler is already registered for
this signal.
"""
if UNAME in ('FreeBSD', 'Darwin'):
# first, turn *off* normal signal handling...
signal.signal (signum, signal.SIG_IGN)
# register with kqueue
flags = coro.EV.ADD
if once_only:
flags |= coro.EV.ONESHOT
k_handler = lambda x: handler(x.ident)
coro.set_handler ((signum, coro.EVFILT.SIGNAL), k_handler, flags)
elif UNAME == 'Linux':
coro.signalfd_handler (signum, handler)
else:
signal.signal (signum, handler)
# alias for backward compatibility
register_signal_handler = register