mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-22 21:41:04 +01:00
120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 1997 - 1999, 2001 Brian Somers <brian@Awfulhak.org>
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR 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.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <signal.h>
|
|
|
|
#include "log.h"
|
|
#include "sig.h"
|
|
|
|
static int caused[NSIG]; /* An array of pending signals */
|
|
static int necessary; /* Anything set ? */
|
|
static sig_type handler[NSIG]; /* all start at SIG_DFL */
|
|
|
|
|
|
/*
|
|
* Record a signal in the "caused" array
|
|
*
|
|
* This function is the only thing actually called in signal context. It
|
|
* records that a signal has been caused and that sig_Handle() should be
|
|
* called (in non-signal context) as soon as possible to process that
|
|
* signal.
|
|
*/
|
|
static void
|
|
signal_recorder(int sig)
|
|
{
|
|
caused[sig - 1]++;
|
|
necessary = 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Set up signal_recorder to handle the given sig and record ``fn'' as
|
|
* the function to ultimately call in sig_Handle(). ``fn'' will not be
|
|
* called in signal context (as sig_Handle() is not called in signal
|
|
* context).
|
|
*/
|
|
sig_type
|
|
sig_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 ?) */
|
|
log_Printf(LogALERT, "Eeek! %s:%d: 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
|
|
*
|
|
* This function is called from a non-signal context - in fact, it's
|
|
* called every time select() in DoLoop() returns - just in case
|
|
* select() returned due to a signal being recorded by signal_recorder().
|
|
*/
|
|
int
|
|
sig_Handle(void)
|
|
{
|
|
int sig;
|
|
int got;
|
|
int result;
|
|
|
|
result = 0;
|
|
if (necessary) {
|
|
/* We've *probably* got something in `caused' set */
|
|
necessary = 0;
|
|
/* `necessary' might go back to 1 while we're in here.... */
|
|
do {
|
|
got = 0;
|
|
for (sig = 0; sig < NSIG; sig++)
|
|
if (caused[sig]) {
|
|
caused[sig]--;
|
|
got++;
|
|
result++;
|
|
(*handler[sig])(sig + 1);
|
|
}
|
|
} while (got);
|
|
}
|
|
|
|
return result;
|
|
}
|