/*
 * Z80SIM  -  a	Z80-CPU	simulator
 *
 * Copyright (C) 1987-2006 by Udo Munk
 *
 * History:
 * 28-SEP-87 Development on TARGON/35 with AT&T Unix System V.3
 * 11-JAN-89 Release 1.1
 * 08-FEB-89 Release 1.2
 * 13-MAR-89 Release 1.3
 * 09-FEB-90 Release 1.4 Ported to TARGON/31 M10/30
 * 20-DEC-90 Release 1.5 Ported to COHERENT 3.0
 * 10-JUN-92 Release 1.6 long casting problem solved with COHERENT 3.2
 *			 and some optimization
 * 25-JUN-92 Release 1.7 comments in english
 * 04-OCT-06 Release 1.8 modified to compile on modern POSIX OS's
 */

/*
 *	This module contain the interrupt handlers for the OS:
 *
 *	int_on()	: initialize interrupt handlers
 *	int_off()	: reset interrupts to default
 *	user_int()	: handler for user interrupt (CNTL-C)
 *	quit_int()	: handler for signal "quit" (CNTL-\)
 *	term_int()	: handler for signal SIGTERM when process is killed
 */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <termios.h>
#include <signal.h>
#include "sim.h"
#include "simglb.h"

static void user_int(int), quit_int(int), term_int(int);
extern void exit_io(void), int_off();
extern struct termios old_term;

void int_on(void)
{
	static struct sigaction newact;

	newact.sa_handler = user_int;
	sigaction(SIGINT, &newact, NULL);
	newact.sa_handler = quit_int;
	sigaction(SIGQUIT, &newact, NULL);
	newact.sa_handler = term_int;
	sigaction(SIGTERM, &newact, NULL);
}

void int_off(void)
{
	static struct sigaction newact;

	newact.sa_handler = SIG_DFL;
	sigaction(SIGINT, &newact, NULL);
	sigaction(SIGQUIT, &newact, NULL);
	sigaction(SIGTERM, &newact, NULL);
}

static void user_int(int sig)
{
#ifdef CNTL_C
	cpu_error = USERINT;
	cpu_state = STOPPED;
#else
	cntl_c++;
#endif
}

static void quit_int(int sig)
{
#ifdef CNTL_BS
	cpu_error = USERINT;
	cpu_state = STOPPED;
#else
	cntl_bs++;
#endif
}

static void term_int(int sig)
{
	exit_io();
	int_off();
	tcsetattr(0, TCSADRAIN, &old_term);
	puts("\nKilled by user");
	exit(0);
}