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gdbmconst.h
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1993-10-30
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/* gdbmconst.h - The constants defined for use in gdbm. */
/* This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
Copyright (C) 1990, 1991, 1993 Free Software Foundation, Inc.
GDBM is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GDBM is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GDBM; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
You may contact the author by:
e-mail: phil@cs.wwu.edu
us-mail: Philip A. Nelson
Computer Science Department
Western Washington University
Bellingham, WA 98226
*************************************************************************/
/* Start with the constant definitions. */
#define TRUE 1
#define FALSE 0
/* Parameters to gdbm_open. */
#define GDBM_READER 0 /* READERS only. */
#define GDBM_WRITER 1 /* READERS and WRITERS. Can not create. */
#define GDBM_WRCREAT 2 /* If not found, create the db. */
#define GDBM_NEWDB 3 /* ALWAYS create a new db. (WRITER) */
#define GDBM_FAST 16 /* Write fast! => No fsyncs. */
/* Parameters to gdbm_store for simple insertion or replacement in the
case a key to store is already in the database. */
#define GDBM_INSERT 0 /* Do not overwrite data in the database. */
#define GDBM_REPLACE 1 /* Replace the old value with the new value. */
/* Parameters to gdbm_setopt, specifing the type of operation to perform. */
#define GDBM_CACHESIZE 1 /* Set the cache size. */
/* In freeing blocks, we will ignore any blocks smaller (and equal) to
IGNORE_SIZE number of bytes. */
#define IGNORE_SIZE 4
/* The number of key bytes kept in a hash bucket. */
#define SMALL 4
/* The number of bucket_avail entries in a hash bucket. */
#define BUCKET_AVAIL 6
/* The size of the bucket cache. */
#define DEFAULT_CACHESIZE 100