/*
 * sys_signal.c - associate a specific signal handler to a given signal.
 * 
 * Authors   Ghassan Almaless (2008,2009,2010,2011,2012)
 *           Alain Greiner (2016,2017)
 *
 * Copyright (c) UPMC Sorbonne Universites
 *
 * This file is part of ALMOS-kernel.
 *
 * ALMOS-kernel 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; version 2.0 of the License.
 *
 * ALMOS-kernel 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 ALMOS-kernel; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <hal_types.h>
#include <errno.h>
#include <thread.h>
#include <printk.h>
#include <signal.h>

//////////////////////////////////
int sys_signal( uint32_t   sig_id,
                void     * handler )
{  
	thread_t  * this = CURRENT_THREAD;

	if((sig_id == 0) || (sig_id >= SIG_NR) || (sig_id == SIGKILL) || (sig_id == SIGSTOP))
	{
        printk("\n[ERROR] in %s : illega signal index = %d\n", __FUNCTION__ , sig_id );
		this->errno = EINVAL;
		return -1;
	}

	// register handler in signal manager for the calling process
	this->process->sig_mgr.sigactions[sig_id] = handler;

	signal_dmsg("\n[INFO] %s : handler @%x has been registred for signal %d\n",
	            __FUNCTION__ , handler , sig_id );

	return 0;
}

