1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1988 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32/*
33 *	ssignal, gsignal: software signals
34 */
35
36#include "lint.h"
37#include <sys/types.h>
38#include <signal.h>
39
40/* Highest allowable user signal number */
41#define	MAXSIGNUM	17
42
43/* Lowest allowable signal number (lowest user number is always 1) */
44#define	MINSIG	(-4)
45
46/* Table of signal values */
47static int (*sigs[MAXSIGNUM-MINSIG+1])(int);
48
49int (*
50ssignal(int sig, int (*action)(int)))(int)
51{
52	int (*savefn)(int);
53
54	if (sig >= MINSIG && sig <= MAXSIGNUM) {
55		savefn = sigs[sig-MINSIG];
56		sigs[sig-MINSIG] = action;
57	} else
58		savefn = (int(*)(int))SIG_DFL;
59
60	return (savefn);
61}
62
63int
64gsignal(int sig)
65{
66	int (*sigfn)(int);
67
68	if (sig < MINSIG || sig > MAXSIGNUM ||
69	    (sigfn = sigs[sig-MINSIG]) == (int(*)(int))SIG_DFL)
70		return (0);
71	else if (sigfn == (int(*)(int))SIG_IGN)
72		return (1);
73	else {
74		sigs[sig-MINSIG] = (int(*)(int))SIG_DFL;
75		return ((*sigfn)(sig));
76	}
77}
78