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/*
* $Id: sig.c,v 1.6 2003/12/01 09:10:16 troth Exp $
*
****************************************************************************
*
* simulavr - A simulator for the Atmel AVR family of microcontrollers.
* Copyright (C) 2001, 2002, 2003 Theodore A. Roth
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
****************************************************************************
*/
/**
* \file sig.c
* \brief Public interface to signal handlers.
*
* This module provides a way for the simulator to process signals generated
* by the native host system. Note that these signals in this context have
* nothing to do with signals or interrupts as far as a program running in the
* simulator is concerned. */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include "avrerror.h"
#include "sig.h"
static volatile int global_got_sigint = 0;
/*
* Private.
*
* Handler for SIGINT signals.
*/
static void
signal_handle_sigint (int signo)
{
global_got_sigint = 1;
}
/**
* \brief Start watching for the occurrance of the given signal.
*
* This function will install a signal handler which will set a flag when the
* signal occurs. Once the watch has been started, periodically call
* signal_has_occurred() to check if the signal was raised.
*/
void
signal_watch_start (int signo)
{
struct sigaction act, oact;
sigemptyset (&act.sa_mask);
act.sa_flags = 0;
switch (signo)
{
case SIGINT:
global_got_sigint = 0;
act.sa_handler = signal_handle_sigint;
break;
default:
avr_warning ("Invalid signal: %d\n", signo);
return;
}
if (sigaction (signo, &act, &oact) < 0)
avr_warning ("Failed to install signal handler: sig=%d: %s\n", signo,
strerror (errno));
}
/**
* \brief Stop watching signal.
*
* Restores the default signal handler for the given signal and resets the
* signal flag.
*/
void
signal_watch_stop (int signo)
{
struct sigaction act, oact;
sigemptyset (&act.sa_mask);
act.sa_flags = 0;
act.sa_handler = SIG_DFL;
signal_reset (signo);
if (sigaction (signo, &act, &oact) < 0)
avr_warning ("Failed to restore default signal handler: sig=%d: %s\n",
signo, strerror (errno));
}
/**
* \brief Check to see if a signal has occurred.
*
* \return Non-zero if signal has occurred. The flag will always be reset
* automatically.
*/
int
signal_has_occurred (int signo)
{
int res = 0;
switch (signo)
{
case SIGINT:
res = global_got_sigint;
global_got_sigint = 0;
break;
default:
avr_warning ("Invalid signal: %d", signo);
}
return res;
}
/**
* \brief Clear the flag which indicates that a signal has ocurred.
*
* Use signal_reset to manually reset (i.e. clear) the flag.
*/
void
signal_reset (int signo)
{
signal_has_occurred (signo);
}
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