util_sig.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2000-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: util_sig.c,v 12.1 2005/06/16 20:20:55 bostic Exp $
 */

#include "db_config.h"

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <signal.h>
#endif

#include "db_int.h"

static int      interrupt;
static void     onint __P((int));

/*
 * onint --
 *      Interrupt signal handler.
 */
static void
onint(signo)
        int signo;
{
        if ((interrupt = signo) == 0)
                interrupt = SIGINT;
}

/*
 * __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
        (void)signal(SIGHUP, onint);
#endif
        (void)signal(SIGINT, onint);
#ifdef SIGPIPE
        (void)signal(SIGPIPE, onint);
#endif
        (void)signal(SIGTERM, onint);
}

/*
 * __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) {
                (void)signal(interrupt, SIG_DFL);
                (void)raise(interrupt);
                /* NOTREACHED */
        }
}

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