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      1 /*	$NetBSD: db.c,v 1.21 2024/01/20 14:52:46 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #if HAVE_NBTOOL_CONFIG_H
     33 #include "nbtool_config.h"
     34 #endif
     35 
     36 #include <sys/cdefs.h>
     37 __RCSID("$NetBSD: db.c,v 1.21 2024/01/20 14:52:46 christos Exp $");
     38 
     39 #include "namespace.h"
     40 #include <sys/types.h>
     41 
     42 #include <errno.h>
     43 #include <fcntl.h>
     44 #include <stddef.h>
     45 #include <stdio.h>
     46 
     47 #include <db.h>
     48 static int __dberr(const DB *, ...);
     49 
     50 #ifdef __weak_alias
     51 __weak_alias(dbopen,_dbopen)
     52 #endif
     53 
     54 #ifndef O_CLOEXEC
     55 #define O_CLOEXEC 0
     56 #endif
     57 
     58 DB *
     59 dbopen(const char *fname, int flags, mode_t mode, DBTYPE type,
     60     const void *openinfo)
     61 {
     62 
     63 #define	DB_FLAGS	(DB_LOCK | DB_SHMEM | DB_TXN)
     64 #define	USE_OPEN_FLAGS							\
     65 	(O_CREAT | O_EXCL | O_EXLOCK | O_NONBLOCK | O_RDONLY |		\
     66 	 O_RDWR | O_SHLOCK | O_TRUNC | O_CLOEXEC)
     67 
     68 	if ((flags & ~(USE_OPEN_FLAGS | DB_FLAGS)) == 0)
     69 		switch (type) {
     70 		case DB_BTREE:
     71 			return (__bt_open(fname, flags & USE_OPEN_FLAGS,
     72 			    mode, openinfo, (int)(flags & DB_FLAGS)));
     73 		case DB_HASH:
     74 			return (__hash_open(fname, flags & USE_OPEN_FLAGS,
     75 			    mode, openinfo, (int)(flags & DB_FLAGS)));
     76 		case DB_RECNO:
     77 			return (__rec_open(fname, flags & USE_OPEN_FLAGS,
     78 			    mode, openinfo, (int)(flags & DB_FLAGS)));
     79 		}
     80 	errno = EINVAL;
     81 	return (NULL);
     82 }
     83 
     84 /*ARGSUSED*/
     85 static int
     86 __dberr(const DB *dbp, ...)
     87 {
     88 	return (RET_ERROR);
     89 }
     90 
     91 /*
     92  * __DBPANIC -- Stop.
     93  *
     94  * Parameters:
     95  *	dbp:	pointer to the DB structure.
     96  */
     97 void
     98 __dbpanic(DB *dbp)
     99 {
    100 	/* The only thing that can succeed is a close. */
    101 	dbp->del = (int (*)(const DB *, const DBT *, u_int))__dberr;
    102 	dbp->fd = (int (*)(const DB *))__dberr;
    103 	dbp->get = (int (*)(const DB *, const DBT *, DBT *, u_int))__dberr;
    104 	dbp->put = (int (*)(const DB *, DBT *, const DBT *, u_int))__dberr;
    105 	dbp->seq = (int (*)(const DB *, DBT *, DBT *, u_int))__dberr;
    106 	dbp->sync = (int (*)(const DB *, u_int))__dberr;
    107 }
    108