1 /*- 2 * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $Id: sig.c,v 1.11.2.5 1998/05/01 19:25:56 brian Exp $ 27 */ 28 29 #include <sys/types.h> 30 31 #include <signal.h> 32 33 #include "log.h" 34 #include "sig.h" 35 36 static int caused[NSIG]; /* An array of pending signals */ 37 static sig_type handler[NSIG]; /* all start at SIG_DFL */ 38 39 40 /* Record a signal in the "caused" array */ 41 42 static void 43 signal_recorder(int sig) 44 { 45 caused[sig - 1]++; 46 } 47 48 49 /* 50 * Set up signal_recorder, and record handler as the function to ultimately 51 * call in handle_signal() 52 */ 53 54 sig_type 55 sig_signal(int sig, sig_type fn) 56 { 57 sig_type Result; 58 59 if (sig <= 0 || sig > NSIG) { 60 /* Oops - we must be a bit out of date (too many sigs ?) */ 61 log_Printf(LogALERT, "Eeek! %s:%d: I must be out of date!\n", 62 __FILE__, __LINE__); 63 return signal(sig, fn); 64 } 65 Result = handler[sig - 1]; 66 if (fn == SIG_DFL || fn == SIG_IGN) { 67 signal(sig, fn); 68 handler[sig - 1] = (sig_type) 0; 69 } else { 70 handler[sig - 1] = fn; 71 signal(sig, signal_recorder); 72 } 73 caused[sig - 1] = 0; 74 return Result; 75 } 76 77 78 /* Call the handlers for any pending signals */ 79 80 void 81 sig_Handle() 82 { 83 int sig; 84 int got; 85 86 do { 87 got = 0; 88 for (sig = 0; sig < NSIG; sig++) 89 if (caused[sig]) { 90 caused[sig]--; 91 got++; 92 (*handler[sig]) (sig + 1); 93 } 94 } while (got); 95 } 96