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 */ 47 static int (*sigs[MAXSIGNUM-MINSIG+1])(int); 48 49 int (* 50 ssignal(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 63 int 64 gsignal(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