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/* Break.c implements an interrupt handler for SIGINT.
Copyright (C) 2004-2022 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 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 3, or (at your option)
any later version.
GNU Modula-2 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include <config.h>
#if defined(HAVE_STDIO_H)
#include <stdio.h>
#endif
#if defined(HAVE_STDARG_H)
#include <stdarg.h>
#endif
#if defined(HAVE_STDLIB_H)
#include <stdlib.h>
#endif
#if defined(HAVE_MALLOC_H)
#include <malloc.h>
#endif
typedef void (*PROC) (void);
#if defined(HAVE_SIGNAL_H)
#include <signal.h>
struct plist
{
PROC proc;
struct plist *next;
};
static struct plist *head = NULL;
/* localHandler - dismisses the parameter, p, and invokes the GNU
Modula-2 handler. */
static void
localHandler (int p)
{
if (head != NULL)
head->proc ();
}
/* EnableBreak - enable the current break handler. */
void
Break_EnableBreak (void)
{
signal (SIGINT, localHandler);
}
/* DisableBreak - disable the current break handler (and all
installed handlers). */
void
Break_DisableBreak (void)
{
signal (SIGINT, SIG_IGN);
}
/* InstallBreak - installs a procedure, p, to be invoked when a
ctrl-c is caught. Any number of these procedures may be stacked.
Only the top procedure is run when ctrl-c is caught. */
void
Break_InstallBreak (PROC p)
{
struct plist *q = (struct plist *)malloc (sizeof (struct plist));
if (q == NULL)
{
perror ("out of memory error in module Break");
exit (1);
}
q->next = head;
head = q;
head->proc = p;
}
/* UnInstallBreak - pops the break handler stack. */
void
Break_UnInstallBreak (void)
{
struct plist *q = head;
if (head != NULL)
{
head = head->next;
free (q);
}
}
#else
void
Break_EnableBreak (void)
{
}
void
Break_DisableBreak (void)
{
}
void
Break_InstallBreak (PROC *p)
{
}
void
Break_UnInstallBreak (void)
{
}
#endif
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