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/* Oops - we must be a bit out of date (too many sigs ?)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 %s:%s: I must be out of date!\n",__FILE__,__LINE__);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