db/db/db.c

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*-
  24  * Copyright (c) 1991, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  */
  55
  56 #if defined(LIBC_SCCS) && !defined(lint)
  57 static char sccsid[] = "@(#)db.c        8.4 (Berkeley) 2/21/94";
  58 #endif /* LIBC_SCCS and not lint */
  59 #include <sys/cdefs.h>
  60
  61 #include <sys/types.h>
  62
  63 #include <errno.h>
  64 #include <fcntl.h>
  65 #include <stddef.h>
  66 #include <stdio.h>
  67
  68 #include <db.h>
  69
  70 DB *
  71 dbopen(fname, flags, mode, type, openinfo)
  72         const char *fname;
  73         int flags, mode;
  74         DBTYPE type;
  75         const void *openinfo;
  76 {
  77
  78 #define DB_FLAGS        (DB_LOCK | DB_SHMEM | DB_TXN)
  79 #define USE_OPEN_FLAGS                                                  \
  80         (O_CREAT | O_EXCL | O_EXLOCK | O_NONBLOCK | O_RDONLY |          \
  81          O_RDWR | O_SHLOCK | O_TRUNC)
  82
  83         if ((flags & ~(USE_OPEN_FLAGS | DB_FLAGS)) == 0)
  84                 switch (type) {
  85                 case DB_BTREE:
  86                         return (__bt_open(fname, flags & USE_OPEN_FLAGS,
  87                             mode, openinfo, flags & DB_FLAGS));
  88                 case DB_HASH:
  89                         return (__hash_open(fname, flags & USE_OPEN_FLAGS,
  90                             mode, openinfo, flags & DB_FLAGS));
  91                 case DB_RECNO:
  92                         return (__rec_open(fname, flags & USE_OPEN_FLAGS,
  93                             mode, openinfo, flags & DB_FLAGS));
  94                 }
  95         errno = EINVAL;
  96         return (NULL);
  97 }
  98
  99 static int
 100 __dberr()
 101 {
 102         return (RET_ERROR);
 103 }
 104
 105 /*
 106  * __DBPANIC -- Stop.
 107  *
 108  * Parameters:
 109  *      dbp:    pointer to the DB structure.
 110  */
 111 void
 112 __dbpanic(dbp)
 113         DB *dbp;
 114 {
 115         /* The only thing that can succeed is a close. */
 116         dbp->del = (int (*)())__dberr;
 117         dbp->fd = (int (*)())__dberr;
 118         dbp->get = (int (*)())__dberr;
 119         dbp->put = (int (*)())__dberr;
 120         dbp->seq = (int (*)())__dberr;
 121         dbp->sync = (int (*)())__dberr;
 122 }