136270Swpaul/*- 236270Swpaul * Copyright (c) 1997 - 1999, 2001 Brian Somers <brian@Awfulhak.org> 336270Swpaul * All rights reserved. 436270Swpaul * 536270Swpaul * Redistribution and use in source and binary forms, with or without 636270Swpaul * modification, are permitted provided that the following conditions 736270Swpaul * are met: 836270Swpaul * 1. Redistributions of source code must retain the above copyright 936270Swpaul * notice, this list of conditions and the following disclaimer. 1036270Swpaul * 2. Redistributions in binary form must reproduce the above copyright 1136270Swpaul * notice, this list of conditions and the following disclaimer in the 1236270Swpaul * documentation and/or other materials provided with the distribution. 1336270Swpaul * 1436270Swpaul * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1536270Swpaul * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1636270Swpaul * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1736270Swpaul * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1836270Swpaul * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1936270Swpaul * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2036270Swpaul * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2136270Swpaul * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2236270Swpaul * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2336270Swpaul * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2436270Swpaul * SUCH DAMAGE. 2536270Swpaul * 2636270Swpaul * $FreeBSD: releng/11.0/usr.sbin/ppp/sig.c 97140 2002-05-22 21:08:58Z brian $ 2736270Swpaul */ 2836270Swpaul 2936270Swpaul#include <sys/types.h> 3036270Swpaul 3136270Swpaul#include <signal.h> 3236302Swpaul 3336270Swpaul#include "log.h" 3436270Swpaul#include "sig.h" 3536270Swpaul 3636270Swpaulstatic int caused[NSIG]; /* An array of pending signals */ 3736270Swpaulstatic int necessary; /* Anything set ? */ 3836270Swpaulstatic sig_type handler[NSIG]; /* all start at SIG_DFL */ 3936270Swpaul 4036270Swpaul 4136270Swpaul/* 4236270Swpaul * Record a signal in the "caused" array 4336270Swpaul * 4436270Swpaul * This function is the only thing actually called in signal context. It 4536270Swpaul * records that a signal has been caused and that sig_Handle() should be 4636270Swpaul * called (in non-signal context) as soon as possible to process that 4736270Swpaul * signal. 4836270Swpaul */ 4936270Swpaulstatic void 5036270Swpaulsignal_recorder(int sig) 5136270Swpaul{ 5236270Swpaul caused[sig - 1]++; 5336270Swpaul necessary = 1; 5436270Swpaul} 5536270Swpaul 5636270Swpaul 5736270Swpaul/* 5836270Swpaul * Set up signal_recorder to handle the given sig and record ``fn'' as 5936270Swpaul * the function to ultimately call in sig_Handle(). ``fn'' will not be 6036270Swpaul * called in signal context (as sig_Handle() is not called in signal 6136270Swpaul * context). 6236270Swpaul */ 6336270Swpaulsig_type 6436270Swpaulsig_signal(int sig, sig_type fn) 6536270Swpaul{ 6636270Swpaul sig_type Result; 6736270Swpaul 6836270Swpaul if (sig <= 0 || sig > NSIG) { 6936270Swpaul /* Oops - we must be a bit out of date (too many sigs ?) */ 7036270Swpaul log_Printf(LogALERT, "Eeek! %s:%d: I must be out of date!\n", 7136270Swpaul __FILE__, __LINE__); 7236270Swpaul return signal(sig, fn); 7336270Swpaul } 7436270Swpaul Result = handler[sig - 1]; 7536270Swpaul if (fn == SIG_DFL || fn == SIG_IGN) { 7636270Swpaul signal(sig, fn); 7736270Swpaul handler[sig - 1] = (sig_type) 0; 7836270Swpaul } else { 7936270Swpaul handler[sig - 1] = fn; 8036270Swpaul signal(sig, signal_recorder); 8136270Swpaul } 8236270Swpaul caused[sig - 1] = 0; 8336270Swpaul return Result; 8436270Swpaul} 8536270Swpaul 8636270Swpaul 8736270Swpaul/* 8836270Swpaul * Call the handlers for any pending signals 8936270Swpaul * 9036270Swpaul * This function is called from a non-signal context - in fact, it's 9136270Swpaul * called every time select() in DoLoop() returns - just in case 9236270Swpaul * select() returned due to a signal being recorded by signal_recorder(). 9336270Swpaul */ 9436270Swpaulint 9536270Swpaulsig_Handle() 9636270Swpaul{ 9736270Swpaul int sig; 9836270Swpaul int got; 9936270Swpaul int result; 10036270Swpaul 10136270Swpaul result = 0; 10236270Swpaul if (necessary) { 10336270Swpaul /* We've *probably* got something in `caused' set */ 10436270Swpaul necessary = 0; 10536270Swpaul /* `necessary' might go back to 1 while we're in here.... */ 10636270Swpaul do { 10736270Swpaul got = 0; 10836270Swpaul for (sig = 0; sig < NSIG; sig++) 10936270Swpaul if (caused[sig]) { 11036270Swpaul caused[sig]--; 11136270Swpaul got++; 11236270Swpaul result++; 11336270Swpaul (*handler[sig])(sig + 1); 11436270Swpaul } 11536270Swpaul } while (got); 11636270Swpaul } 11736270Swpaul 11836270Swpaul return result; 11936270Swpaul} 12036270Swpaul