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/*
This file is part of GNUnet.
(C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009 Christian Grothoff (and other contributing authors)
GNUnet 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, or (at your
option) any later version.
GNUnet 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 GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file include/gnunet_signal_lib.h
* @brief functions related to signals
* @author Christian Grothoff
*/
#ifndef GNUNET_SIGNAL_LIB_H
#define GNUNET_SIGNAL_LIB_H
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
/**
* Context created when a signal handler is installed;
* can be used to restore it to the previous state later.
*/
struct GNUNET_SIGNAL_Context;
/**
* A signal handler. Since different OSes have different signatures
* for their handlers, the API only gives the most restrictive
* signature -- no arguments, no return value. Note that this will
* work even if the OS expects a function with arguments. However,
* the implementation must guarantee that this handler is not called
* for signals other than the one that it has been registered for.
*/
typedef void (*GNUNET_SIGNAL_Handler) (void);
/**
* Install a signal handler that will be run if the
* given signal is received.
*
* @param signal the number of the signal
* @param handler the function to call
* @return context that can be used to restore, NULL on error
*/
struct GNUNET_SIGNAL_Context *
GNUNET_SIGNAL_handler_install (int signal, GNUNET_SIGNAL_Handler handler);
/**
* Uninstall a previously installed signal hander.
*
* @param ctx context that was returned when the
* signal handler was installed
*/
void
GNUNET_SIGNAL_handler_uninstall (struct GNUNET_SIGNAL_Context *ctx);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
/* ifndef GNUNET_SIGNAL_LIB_H */
#endif
/* end of gnunet_signal_lib.h */
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