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137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. ***REMOVED*** - see
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* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)db.c 8.4 (Berkeley) 2/21/94";
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#endif /* LIBC_SCCS and not lint */
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#ifndef __DBINTERFACE_PRIVATE
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#define __DBINTERFACE_PRIVATE
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#endif
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#ifdef macintosh
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#include <unix.h>
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#else
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#include <sys/types.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <stdio.h>
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#include "mcom_db.h"
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/* a global flag that locks closed all databases */
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int all_databases_locked_closed = 0;
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/* set or unset a global lock flag to disable the
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* opening of any DBM file
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*/
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void
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dbSetOrClearDBLock(DBLockFlagEnum type)
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{
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if(type == LockOutDatabase)
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all_databases_locked_closed = 1;
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else
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all_databases_locked_closed = 0;
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}
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DB *
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dbopen(const char *fname, int flags,int mode, DBTYPE type, const void *openinfo)
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{
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/* lock out all file databases. Let in-memory databases through
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*/
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if(all_databases_locked_closed && fname)
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{
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errno = EINVAL;
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return(NULL);
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}
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#define DB_FLAGS (DB_LOCK | DB_SHMEM | DB_TXN)
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#if 0 /* most systems don't have EXLOCK and SHLOCK */
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#define USE_OPEN_FLAGS \
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(O_CREAT | O_EXCL | O_EXLOCK | O_NONBLOCK | O_RDONLY | \
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O_RDWR | O_SHLOCK | O_TRUNC)
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#else
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#define USE_OPEN_FLAGS \
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(O_CREAT | O_EXCL | O_RDONLY | \
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O_RDWR | O_TRUNC)
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#endif
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if ((flags & ~(USE_OPEN_FLAGS | DB_FLAGS)) == 0)
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switch (type) {
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/* we don't need btree and recno right now */
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#if 0
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case DB_BTREE:
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return (__bt_open(fname, flags & USE_OPEN_FLAGS,
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mode, openinfo, flags & DB_FLAGS));
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case DB_RECNO:
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return (__rec_open(fname, flags & USE_OPEN_FLAGS,
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mode, openinfo, flags & DB_FLAGS));
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#endif
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case DB_HASH:
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return (__hash_open(fname, flags & USE_OPEN_FLAGS,
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mode, (const HASHINFO *)openinfo, flags & DB_FLAGS));
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default:
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break;
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}
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errno = EINVAL;
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return (NULL);
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}
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static int
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__dberr()
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{
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return (RET_ERROR);
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}
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/*
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* __DBPANIC -- Stop.
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*
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* Parameters:
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* dbp: pointer to the DB structure.
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*/
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void
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__dbpanic(DB *dbp)
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{
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/* The only thing that can succeed is a close. */
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dbp->del = (int (*)(const struct __db *, const DBT *, uint))__dberr;
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dbp->fd = (int (*)(const struct __db *))__dberr;
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dbp->get = (int (*)(const struct __db *, const DBT *, DBT *, uint))__dberr;
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dbp->put = (int (*)(const struct __db *, DBT *, const DBT *, uint))__dberr;
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dbp->seq = (int (*)(const struct __db *, DBT *, DBT *, uint))__dberr;
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dbp->sync = (int (*)(const struct __db *, uint))__dberr;
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}
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