freebsd-dev/usr.sbin/ppp/sig.c
Brian Somers f5ff0f7c99 Reviewed by: ache@freebsd.org
These changes should fix the signal "problems" in ppp.
The signal changes should really be put into 2.2 too !
The following patches should do it.  There were some other
changes made by Andrey recently that havn't been brought
into 2.2, it may be worth doing them now.
1997-03-13 12:45:35 +00:00

96 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: sig.c,v 1.4 1997/02/25 14:05:10 brian Exp $
*
* TODO:
*
*/
#include <sys/cdefs.h>
#include "sig.h"
#include <sys/types.h>
#include <signal.h>
#include "mbuf.h"
#include "log.h"
static caused[NSIG]; /* An array of pending signals */
static sig_type handler[NSIG]; /* all start at SIG_DFL */
/* Record a signal in the "caused" array */
static void signal_recorder(int sig) {
caused[sig-1]++;
}
/*
set up signal_recorder, and record handler as the function to ultimately
call in handle_signal()
*/
sig_type pending_signal(int sig,sig_type fn) {
sig_type Result;
if (sig <= 0 || sig > NSIG) {
/* 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) {
signal(sig,fn);
handler[sig-1] = (sig_type)0;
} else {
handler[sig-1] = fn;
signal(sig,signal_recorder);
}
caused[sig-1] = 0;
return Result;
}
/* Call the handlers for any pending signals */
void handle_signals() {
int sig;
int got;
do {
got = 0;
for (sig = 0; sig < NSIG; sig++)
if (caused[sig]) {
caused[sig]--;
got++;
(*handler[sig])(sig+1);
}
} while(got);
}