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/*
This file is part of GNUnet.
Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
*/
/**
* @author Christian Grothoff
*
* @file
* Functions related to signals
*
* @defgroup signal Signal library
* Manage signal handlers.
* @{
*/
#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);
/**
* Raise the given signal by calling the installed signal handlers. This will
* not use the @em raise() system call but only calls the handlers registered
* through GNUNET_SIGNAL_handler_install().
*
* @param sig the signal to raise
*/
void
GNUNET_SIGNAL_raise (const int sig);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
/* ifndef GNUNET_SIGNAL_LIB_H */
#endif
/** @} */ /* end of group */
/* end of gnunet_signal_lib.h */
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