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/* exception.c
*
* $Id$
*
* Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
* Copyright 2002, 2003 Sam Hocevar <sam@hocevar.net>, Paris
*
* This software was derived from Elk 1.2, which was Copyright 1987, 1988,
* 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
* by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
* between TELES and Nixdorf Microprocessor Engineering, Berlin).
*
* Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
* owners or individual owners of copyright in this software, grant to any
* person or company a worldwide, royalty free, license to
*
* i) copy this software,
* ii) prepare derivative works based on this software,
* iii) distribute copies of this software or derivative works,
* iv) perform this software, or
* v) display this software,
*
* provided that this notice is not removed and that neither Oliver Laumann
* nor Teles nor Nixdorf are deemed to have made any representations as to
* the suitability of this software for any purpose nor are held responsible
* for any defects of this software.
*
* THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
*/
#include "config.h"
#include <stdlib.h>
#include "kernel.h"
extern void Reset () elk_attribute(__noreturn__);
int Intr_Was_Ignored;
unsigned long int Intr_Level;
#if defined(HAVE_SIGPROCMASK)
sigset_t Sigset_Old, Sigset_Block;
#elif defined(HAVE_SIGBLOCK)
int Sigmask_Old, Sigmask_Block;
#endif
static Object V_Interrupt_Handler;
/* Make sure temp files are removed on hangup and broken pipe.
*/
/*ARGSUSED*/
void Signal_Exit (int sig) {
Exit_Handler ();
exit (1);
}
void Init_Exception () {
Define_Variable (&V_Interrupt_Handler, "interrupt-handler", Null);
#if defined(HAVE_SIGPROCMASK)
sigemptyset (&Sigset_Block);
sigaddset (&Sigset_Block, SIGINT);
(void)sigprocmask (0, (sigset_t *)0, &Sigset_Old);
#elif defined(HAVE_SIGBLOCK)
Sigmask_Block = sigmask (SIGINT);
Sigmask_Old = sigblock (0);
#endif
#ifdef SIGHUP
(void)signal (SIGHUP, Signal_Exit);
#endif
#ifdef SIGPIPE
(void)signal (SIGPIPE, Signal_Exit);
#endif
}
/*ARGSUSED*/
void Intr_Handler (int sig) {
Object fun;
#if defined(HAVE_SIGPROCMASK) || ! defined(HAVE_SIGBLOCK)
(void)signal (SIGINT, Intr_Handler);
#endif
Set_Error_Tag ("interrupt-handler");
Reset_IO (1);
fun = Var_Get (V_Interrupt_Handler);
if (TYPE(fun) == T_Compound && COMPOUND(fun)->min_args == 0)
(void)Funcall (fun, Null, 0);
Format (Curr_Output_Port, "~%\7Interrupt!~%", 15, 0, (Object *)0);
Reset ();
/*NOTREACHED*/
}
void Install_Intr_Handler () {
if (signal (SIGINT, SIG_IGN) == SIG_IGN)
Intr_Was_Ignored = 1;
else
(void)signal (SIGINT, Intr_Handler);
}
Object P_Disable_Interrupts () {
Disable_Interrupts;
return Make_Unsigned_Long (Intr_Level);
}
Object P_Enable_Interrupts () {
Enable_Interrupts;
return Make_Unsigned_Long (Intr_Level);
}
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