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 /* 31 * ssignal, gsignal: software signals 32 */ 33 34 #include "lint.h" 35 #include <sys/types.h> 36 #include <signal.h> 37 38 /* Highest allowable user signal number */ 39 #define MAXSIGNUM 17 40 41 /* Lowest allowable signal number (lowest user number is always 1) */ 42 #define MINSIG (-4) 43 44 /* Table of signal values */ 45 static int (*sigs[MAXSIGNUM-MINSIG+1])(int); 46 47 int (* 48 ssignal(int sig, int (*action)(int)))(int) 49 { 50 int (*savefn)(int); 51 52 if (sig >= MINSIG && sig <= MAXSIGNUM) { 53 savefn = sigs[sig-MINSIG]; 54 sigs[sig-MINSIG] = action; 55 } else { 56 savefn = (int(*)(int))(uintptr_t)SIG_DFL; 57 } 58 59 return (savefn); 60 } 61 62 int 63 gsignal(int sig) 64 { 65 int (*sigfn)(int); 66 67 if (sig < MINSIG || sig > MAXSIGNUM || 68 (sigfn = sigs[sig-MINSIG]) == (int(*)(int))(uintptr_t)SIG_DFL) { 69 return (0); 70 } else { 71 if (sigfn == (int(*)(int))(uintptr_t)SIG_IGN) { 72 return (1); 73 } else { 74 sigs[sig-MINSIG] = (int(*)(int))(uintptr_t)SIG_DFL; 75 return ((*sigfn)(sig)); 76 } 77 } 78 } 79