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Diffstat (limited to 'dbm/src/db.c')
-rw-r--r-- | dbm/src/db.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/dbm/src/db.c b/dbm/src/db.c new file mode 100644 index 000000000..e4b1fff8f --- /dev/null +++ b/dbm/src/db.c @@ -0,0 +1,144 @@ +/*- + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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 defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)db.c 8.4 (Berkeley) 2/21/94"; +#endif /* LIBC_SCCS and not lint */ + +#include "watcomfx.h" + +#ifndef __DBINTERFACE_PRIVATE +#define __DBINTERFACE_PRIVATE +#endif +#ifdef macintosh +#include <unix.h> +#else +#include <sys/types.h> +#endif + +#include <errno.h> +#include <fcntl.h> +#include <stddef.h> +#include <stdio.h> + +#include "mcom_db.h" + +/* a global flag that locks closed all databases */ +int all_databases_locked_closed = 0; + +/* set or unset a global lock flag to disable the + * opening of any DBM file + */ +void +dbSetOrClearDBLock(DBLockFlagEnum type) +{ + if(type == LockOutDatabase) + all_databases_locked_closed = 1; + else + all_databases_locked_closed = 0; +} + +#if defined(__WATCOMC__) || defined(__WATCOM_CPLUSPLUS__) +DB * +#else +PR_IMPLEMENT(DB *) +#endif +dbopen(const char *fname, int flags,int mode, DBTYPE type, const void *openinfo) +{ + + /* lock out all file databases. Let in-memory databases through + */ + if(all_databases_locked_closed && fname) + { + errno = EINVAL; + return(NULL); + } + +#define DB_FLAGS (DB_LOCK | DB_SHMEM | DB_TXN) + + +#if 0 /* most systems dont have EXLOCK and SHLOCK */ +#define USE_OPEN_FLAGS \ + (O_CREAT | O_EXCL | O_EXLOCK | O_NONBLOCK | O_RDONLY | \ + O_RDWR | O_SHLOCK | O_TRUNC) +#else +#define USE_OPEN_FLAGS \ + (O_CREAT | O_EXCL | O_RDONLY | \ + O_RDWR | O_TRUNC) +#endif + + if ((flags & ~(USE_OPEN_FLAGS | DB_FLAGS)) == 0) + switch (type) { +/* we don't need btree and recno right now */ +#if 0 + case DB_BTREE: + return (__bt_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)); +#endif + + case DB_HASH: + return (__hash_open(fname, flags & USE_OPEN_FLAGS, + mode, (const HASHINFO *)openinfo, flags & DB_FLAGS)); + default: + break; + } + errno = EINVAL; + return (NULL); +} + +static int +__dberr() +{ + 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 *, uint))__dberr; + dbp->fd = (int (*)(const struct __db *))__dberr; + dbp->get = (int (*)(const struct __db *, const DBT *, DBT *, uint))__dberr; + dbp->put = (int (*)(const struct __db *, DBT *, const DBT *, uint))__dberr; + dbp->seq = (int (*)(const struct __db *, DBT *, DBT *, uint))__dberr; + dbp->sync = (int (*)(const struct __db *, uint))__dberr; +} |