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Pull up following revision(s) (requested by christos in ticket #791):
	lib/libc/db/db/db.c: revision 1.18
Fix the build for ancient (rhel5) systems that don't have O_CLOEXEC

/*	$NetBSD: db.c,v 1.16.40.2 2015/05/19 14:14:52 martin Exp $	*/

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  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 BY THE REGENTS 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 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.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
__RCSID("$NetBSD: db.c,v 1.16.40.2 2015/05/19 14:14:52 martin Exp $");

#include "namespace.h"
#include <sys/types.h>

#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdio.h>

#include <db.h>
static int __dberr(void);

#ifdef __weak_alias
__weak_alias(dbopen,_dbopen)
#endif

#ifndef O_CLOEXEC
#define O_CLOEXEC 0
#endif

DB *
dbopen(const char *fname, int flags, mode_t mode, DBTYPE type,
    const void *openinfo)
{

#define	DB_FLAGS	(DB_LOCK | DB_SHMEM | DB_TXN)
#define	USE_OPEN_FLAGS							\
	(O_CREAT | O_EXCL | O_EXLOCK | O_NONBLOCK | O_RDONLY |		\
	 O_RDWR | O_SHLOCK | O_TRUNC | O_CLOEXEC)

	if ((flags & ~(USE_OPEN_FLAGS | DB_FLAGS)) == 0)
		switch (type) {
		case DB_BTREE:
			return (__bt_open(fname, flags & USE_OPEN_FLAGS,
			    mode, openinfo, (int)(flags & DB_FLAGS)));
		case DB_HASH:
			return (__hash_open(fname, flags & USE_OPEN_FLAGS,
			    mode, openinfo, (int)(flags & DB_FLAGS)));
		case DB_RECNO:
			return (__rec_open(fname, flags & USE_OPEN_FLAGS,
			    mode, openinfo, (int)(flags & DB_FLAGS)));
		}
	errno = EINVAL;
	return (NULL);
}

static int
__dberr(void)
{
	return (RET_ERROR);
}

/*
 * __DBPANIC -- Stop.
 *
 * Parameters:
 *	dbp:	pointer to the DB structure.
 */
void
__dbpanic(DB *dbp)
{
	/* The only thing that can succeed is a close. */
	dbp->del = (int (*)(const struct __db *, const DBT*, u_int))__dberr;
	dbp->fd = (int (*)(const struct __db *))__dberr;
	dbp->get = (int (*)(const struct __db *, const DBT*, DBT *, u_int))__dberr;
	dbp->put = (int (*)(const struct __db *, DBT *, const DBT *, u_int))__dberr;
	dbp->seq = (int (*)(const struct __db *, DBT *, DBT *, u_int))__dberr;
	dbp->sync = (int (*)(const struct __db *, u_int))__dberr;
}