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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2000-2006
* Oracle Corporation. All rights reserved.
*
* $Id: util_sig.c,v 12.5 2006/08/24 14:45:11 bostic Exp $
*/
#include "db_config.h"
#include "db_int.h"
static int interrupt;
static void set_signal __P((int, int));
static void signal_handler __P((int));
/*
* signal_handler --
* Interrupt signal handler.
*/
static void
signal_handler(signo)
int signo;
{
#ifndef HAVE_SIGACTION
/* Assume signal() is unreliable and reset it, first thing. */
set_signal(signo, 0);
#endif
/* Some systems don't pass in the correct signal value -- check. */
if ((interrupt = signo) == 0)
interrupt = SIGINT;
}
/*
* set_signal
*/
static void
set_signal(s, is_dflt)
int s, is_dflt;
{
/*
* Use sigaction if it's available, otherwise use signal().
*/
#ifdef HAVE_SIGACTION
struct sigaction sa, osa;
sa.sa_handler = is_dflt ? SIG_DFL : signal_handler;
(void)sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
(void)sigaction(s, &sa, &osa);
#else
(void)signal(s, is_dflt ? SIG_DFL : signal_handler);
#endif
}
/*
* __db_util_siginit --
*
* PUBLIC: void __db_util_siginit __P((void));
*/
void
__db_util_siginit()
{
/*
* Initialize the set of signals for which we want to clean up.
* Generally, we try not to leave the shared regions locked if
* we can.
*/
#ifdef SIGHUP
set_signal(SIGHUP, 0);
#endif
#ifdef SIGINT
set_signal(SIGINT, 0);
#endif
#ifdef SIGPIPE
set_signal(SIGPIPE, 0);
#endif
#ifdef SIGTERM
set_signal(SIGTERM, 0);
#endif
}
/*
* __db_util_interrupted --
* Return if interrupted.
*
* PUBLIC: int __db_util_interrupted __P((void));
*/
int
__db_util_interrupted()
{
return (interrupt != 0);
}
/*
* __db_util_sigresend --
*
* PUBLIC: void __db_util_sigresend __P((void));
*/
void
__db_util_sigresend()
{
/* Resend any caught signal. */
if (interrupt != 0) {
set_signal(interrupt, 1);
(void)raise(interrupt);
/* NOTREACHED */
}
}
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