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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1987 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.2 */ 31 32 /*LINTLIBRARY*/ 33 /* 34 * ssignal, gsignal: software signals 35 */ 36 #include <signal.h> 37 38 /* Highest allowable user signal number */ 39 #define MAXSIG NSIG 40 41 /* Lowest allowable signal number (lowest user number is always 1) */ 42 #define MINSIG (-4) 43 44 /* Table of signal values */ 45 typedef int (*sigfunc)(); 46 sigfunc *ssigp; 47 48 49 sigfunc * 50 _ssig() 51 { 52 if (ssigp == 0) 53 ssigp = (sigfunc *)calloc(MAXSIG-MINSIG+1, sizeof (sigfunc)); 54 return (ssigp); 55 } 56 57 int 58 (*ssignal(sig, fn))() 59 register int sig, (*fn)(); 60 { 61 register int (*savefn)(); 62 register sigfunc *sp = _ssig(); 63 64 if (sp == 0) 65 return ((int (*)())SIG_DFL); 66 if (sig >= MINSIG && sig <= MAXSIG) { 67 savefn = sp[sig-MINSIG]; 68 sp[sig-MINSIG] = fn; 69 } else 70 savefn = (int (*)())SIG_DFL; 71 72 return (savefn); 73 } 74 75 int 76 gsignal(sig) 77 register int sig; 78 { 79 register int (*sigfn)(); 80 register sigfunc *sp = _ssig(); 81 82 if (sp == 0) 83 return (0); 84 if (sig < MINSIG || sig > MAXSIG || 85 (sigfn = sp[sig-MINSIG]) == (int (*)())SIG_DFL) 86 return (0); 87 else if (sigfn == (int (*)())SIG_IGN) 88 return (1); 89 else { 90 sp[sig-MINSIG] = (int (*)())SIG_DFL; 91 return ((*sigfn)(sig)); 92 } 93 } 94