90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* $Id$
|
|
*
|
|
* 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/* Oops - we must be a bit out of date (too many sigs ?)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);
|
|
}
|