/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
/*
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * Use is subject to license terms.
 */
/*
 * Copyright 2006-2020 J. Schilling
 *
 * @(#)setsig.c	1.11 20/09/06 J. Schilling
 */
#if defined(sun)
#pragma ident "@(#)setsig.c 1.11 20/09/06 J. Schilling"
#endif
/*
 * @(#)setsig.c 1.8 06/12/12
 */

#if defined(sun)
#pragma ident	"@(#)setsig.c"
#pragma ident	"@(#)sccs:lib/mpwlib/setsig.c"
#endif
# include       <defines.h>
# include       <i18n.h>
# include	<signal.h>

/*
	General-purpose signal setting routine.
	All non-ignored, non-caught signals are caught.
	If a signal other than hangup, interrupt, or quit is caught,
	a "user-oriented" message is printed on file descriptor 2 with
	a number for help(I).
	If hangup, interrupt or quit is caught, that signal	
	is set to ignore.
	Termination is like that of "fatal",
	via "clean_up(sig)" (sig is the signal number)
	and "exit(userexit(1))".
 
	If the file "dump.core" exists in the current directory
	the function commits
	suicide to produce a core dump
	(after calling clean_up, but before calling userexit).
*/

extern	void	(*f_clean_up) __PR((void));

static struct sigs {
	int	signo;
	char	*msg;
} Mesg[] = {
#ifdef	SIGILL
	{ SIGILL,	"Illegal instruction" },
#endif
#ifdef	SIGTRAP
	{ SIGTRAP,	"Trace/BPT trap" },
#endif
#ifdef	SIGIOT
	{ SIGIOT,	"IOT trap" },
#endif
#ifdef	SIGEMT
	{ SIGEMT,	"EMT trap" },
#endif
#ifdef	SIGFPE
	{ SIGFPE,	"Floating exception" },
#endif
#ifdef	SIGKILL
	{ SIGKILL,	"Killed" },
#endif
#ifdef	SIGBUS
	{ SIGBUS,	"Bus error" },
#endif
#ifdef	SIGSEGV
	{ SIGSEGV,	"Memory fault" },
#endif
#ifdef	SIGSYS
	{ SIGSYS,	"Bad system call" },
#endif
#ifdef	__pipe__handler
#ifdef	SIGPIPE
	{ SIGPIPE,	NULL },
#endif
#endif
#ifdef	SIGALRM
	{ SIGALRM,	"Alarm clock" },
#endif
	{ 0, NULL }
};

static void setsig1	__PR((int sig));

void
setsig()
{
	register int j;
	register void (*n) __PR((int));

	for (j = 0; Mesg[j].signo != 0; j++) {
#ifdef	SETSIG_NO_SIGBUS
		/*
		 * Original behavior was not to catch SIGBUS.
		 * #define SETSIG_NO_SIGBUS to get historic behavior.
		 */
		if (Mesg[j].signo == SIGBUS)
			continue;
#endif
		if ((n = signal(Mesg[j].signo, setsig1)) != NULL)
			signal(Mesg[j].signo, n);
	}
}


static void
setsig1(sig)
int sig;
{
	static int die = 0;
		int	j;
	
	if (die++) {
#ifdef	SIGIOT
		signal(SIGIOT, SIG_DFL);
#endif
#ifdef	SIGEMT
		signal(SIGEMT, SIG_DFL);
#endif
#ifdef	SIGILL
		signal(SIGILL, SIG_DFL);
#endif
		exit(1);
	}

	for (j = 0; Mesg[j].msg != NULL; j++)
		if (Mesg[j].signo == sig)
			break;

	if (Mesg[j].msg) {
		(void) write(2, gettext("SIGNAL: "), length("SIGNAL: "));
		(void) write(2, gettext(Mesg[j].msg), length(Mesg[j].msg));
		(void) write(2, NOGETTEXT(" (ut12)\n"), length(" (ut12)\n"));
	}
	else
		signal(sig, SIG_IGN);
	(*f_clean_up)();
	if(open(NOGETTEXT("dump.core"), O_RDONLY|O_BINARY) > 0) {
		/*
		 * If the file "dump.core" exists in the current directory and
		 * is readable for us, dump the core via abort().
		 */
#ifdef	SIGIOT
		signal(SIGIOT, SIG_DFL);
#endif
#ifdef	SIGEMT
		signal(SIGEMT, SIG_DFL);
#endif
#ifdef	SIGILL
		signal(SIGILL, SIG_DFL);
#endif
		abort();
	}
	exit(userexit(1));
}