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/*
Clif - A C-like Interpreter Framework
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997 T. Hruz, L. Koren
1998 L. Koren
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* sig-bsd.c
*
* Functions for framework interrupt handling.
*/
#include "global.h"
#include "config.h"
#include <stdio.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <termio.h>
#include <fcntl.h>
#include <setjmp.h>
#define OFF(x, y) (x) & (~(y))
#define ON(x, y) (x) | (y)
#define SPACE 0x20
#define NL '\n'
int handler = 0;
int handle_fd;
struct termio term, term_initial;
struct sigvec vec, ovec;
RETSIGTYPE (*interrupt_handler) PROTO((void));
RETSIGTYPE interrupt_service PROTO((void));
void interrupt_register PROTO((void));
void term_restore PROTO((void));
RETSIGTYPE fatal_handler PROTO((void));
void fatal_handler_register PROTO((void));
extern jmp_buf jmpbuf;
extern int error_count;
/* \verbatim{sig_bsd_c_interrupt_service.tex} */
/*
* Asynchronous interrupt service.
*/
RETSIGTYPE
interrupt_service ()
{
#ifdef DEBUG_INTER
printfx ("interrupt\n");
#endif
if ((clif_interrupt_level > 0) || (!virtual_machine_suspended))
/*
* Test of the virtual machine running and the level of interrupt.
* An interrupt is only accepted if the virtual machine is running.
*/
{
#ifdef DEBUG_INTER
printfx ("virtual machine is running, interrupt accepted\n");
#endif
handler = 1;
#ifdef HAVE_TIOCSTI
ioctl (handle_fd, TIOCSTI, "\n");
#endif
}
return;
}
/* \verbatim */
/* \verbatim{sig_bsd_c_interrupt_handler.tex} */
/*
* Registers interrupt handler.
*/
void
interrupt_register ()
{
interrupt_handler = interrupt_service;
handle_fd = fileno (stdin);
ioctl (handle_fd, TCGETA, &term);
term_initial = term;
term.c_cc[0] = 0x14; /* DC4 */
term.c_cc[5] = 0x12; /* DC2 */
ioctl (handle_fd, TCSETA, &term);
vec.sv_handler = interrupt_handler;
sigvec (SIGINT, &vec, &ovec);
}
/* \verbatim */
/*
* Synchronous interrupt service.
*/
void
interrupt_service_sync ()
{
handler = 1;
}
/*
* Restores setting of the terminal at the termination of Clif session.
*/
void
term_restore ()
{
ioctl (handle_fd, TCSETA, &term_initial);
}
RETSIGTYPE
fatal_handler ()
{
if (error_count)
longjmp (jmpbuf, 1);
{
struct sigvec vec, ovec;
vec.sv_handler = SIG_DFL;
sigvec (SIGFPE, &vec, &ovec);
sigvec (SIGSEGV, &vec, &ovec);
}
}
void
fatal_handler_register ()
{
struct sigvec vec, ovec;
vec.sv_handler = fatal_handler;
if (sigvec (SIGFPE, &vec, &ovec) < 0)
error_message (4004);
if (sigvec (SIGSEGV, &vec, &ovec) < 0)
error_message (4004);
}
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