db.1.85/db/db.c

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