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/* Generic signalling/notification infrastructure */
/* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
* All Rights Reserved
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <osmocom/core/signal.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/linuxlist.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
/*! \addtogroup signal
* @{
*/
/*! \file signal.c */
void *tall_sigh_ctx;
static LLIST_HEAD(signal_handler_list);
struct signal_handler {
struct llist_head entry;
unsigned int subsys;
osmo_signal_cbfn *cbfn;
void *data;
};
/*! \brief Register a new signal handler
* \param[in] subsys Subsystem number
* \param[in] cbfn Callback function
* \param[in] data Data passed through to callback
*/
int osmo_signal_register_handler(unsigned int subsys,
osmo_signal_cbfn *cbfn, void *data)
{
struct signal_handler *sig_data;
sig_data = talloc(tall_sigh_ctx, struct signal_handler);
if (!sig_data)
return -ENOMEM;
memset(sig_data, 0, sizeof(*sig_data));
sig_data->subsys = subsys;
sig_data->data = data;
sig_data->cbfn = cbfn;
/* FIXME: check if we already have a handler for this subsys/cbfn/data */
llist_add_tail(&sig_data->entry, &signal_handler_list);
return 0;
}
/*! \brief Unregister signal handler
* \param[in] subsys Subsystem number
* \param[in] cbfn Callback function
* \param[in] data Data passed through to callback
*/
void osmo_signal_unregister_handler(unsigned int subsys,
osmo_signal_cbfn *cbfn, void *data)
{
struct signal_handler *handler;
llist_for_each_entry(handler, &signal_handler_list, entry) {
if (handler->cbfn == cbfn && handler->data == data
&& subsys == handler->subsys) {
llist_del(&handler->entry);
talloc_free(handler);
break;
}
}
}
/*! \brief dispatch (deliver) a new signal to all registered handlers
* \param[in] subsys Subsystem number
* \param[in] signal Signal number,
* \param[in] signal_data Data to be passed along to handlers
*/
void osmo_signal_dispatch(unsigned int subsys, unsigned int signal,
void *signal_data)
{
struct signal_handler *handler;
llist_for_each_entry(handler, &signal_handler_list, entry) {
if (handler->subsys != subsys)
continue;
(*handler->cbfn)(subsys, signal, handler->data, signal_data);
}
}
/*! @} */
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