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90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*-
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* Copyright (c) 1997
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* Brian Somers <brian@awfulhak.demon.co.uk>. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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*
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* TODO:
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*
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*/
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#include "sig.h"
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#include <sys/types.h>
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#include "mbuf.h"
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#include "log.h"
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#define __MAXSIG (32) /* Sizeof u_long: Make life convenient.... */
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static u_long caused; /* A mask of pending signals */
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static __sighandler_t *handler[ __MAXSIG ]; /* all start at SIG_DFL */
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/* Record a signal in the "caused" mask */
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static void signal_recorder(int sig) {
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if (sig > 0 && sig <= __MAXSIG)
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caused |= (1<<(sig-1));
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}
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/*
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set up signal_recorder, and record handler as the function to ultimately
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call in handle_signal()
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*/
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__sighandler_t *pending_signal(int sig,__sighandler_t *fn) {
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__sighandler_t *Result;
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if (sig <= 0 || sig > __MAXSIG) {
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/* Oops - we must be a bit out of date (too many sigs ?) */
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logprintf("Eeek! %s:%s: I must be out of date!\n",__FILE__,__LINE__);
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return signal(sig,fn);
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}
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Result = handler[sig-1];
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if (fn == SIG_DFL || fn == SIG_IGN) {
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handler[sig-1] = (__sighandler_t *)0;
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signal(sig,fn);
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} else {
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handler[sig-1] = fn;
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signal(sig,signal_recorder);
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}
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caused &= ~(1<<(sig-1));
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return Result;
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}
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/* Call the handlers for any pending signals */
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void handle_signals() {
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int sig;
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if (caused)
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for (sig=0; sig<__MAXSIG; sig++, caused>>=1)
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if (caused&1)
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(*handler[sig])(sig+1);
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}
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