xref: /openbsd/lib/libc/db/db/db.c (revision 181ba704)

/*	$OpenBSD: db.c,v 1.13 2015/09/05 11:28:35 guenther 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.
 */

#include <sys/types.h>

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

#include <db.h>

static int __dberr(void);

DB *
dbopen(const char *fname, int flags, int 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_NOFOLLOW | O_NONBLOCK | 	\
	 O_ACCMODE | O_SHLOCK | O_SYNC | O_TRUNC)

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

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;
}