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/* systems.h - Most of the system dependant code and defines are here. */
/* This file is part of GDBM, the GNU data base manager.
Copyright (C) 1990, 1991, 1993, 2007 Free Software Foundation, Inc.
This program 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 3, or (at your option)
any later version.
This program 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 this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Include all system headers first. */
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <stdio.h>
#if HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#include <sys/stat.h>
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifndef SEEK_SET
#define SEEK_SET 0
#endif
#ifndef L_SET
#define L_SET SEEK_SET
#endif
/* Default block size. Some systems do not have blocksize in their
stat record. This code uses the BSD blocksize from stat. */
#if HAVE_STRUCT_STAT_ST_BLKSIZE
#define STATBLKSIZE file_stat.st_blksize
#else
#define STATBLKSIZE 1024
#endif
/* Do we have ftruncate? */
#if HAVE_FTRUNCATE
#define TRUNCATE(dbf) ftruncate (dbf->desc, 0)
#else
#define TRUNCATE(dbf) close( open (dbf->name, O_RDWR|O_TRUNC, mode));
#endif
#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif
/* I/O macros. */
#if HAVE_MMAP
#define __read(_dbf, _buf, _size) _gdbm_mapped_read(_dbf, _buf, _size)
#define __write(_dbf, _buf, _size) _gdbm_mapped_write(_dbf, _buf, _size)
#define __lseek(_dbf, _off, _whn) _gdbm_mapped_lseek(_dbf, _off, _whn)
#define __fsync(_dbf) _gdbm_mapped_sync(_dbf)
#else
#define __read(_dbf, _buf, _size) read(_dbf->desc, _buf, _size)
#define __write(_dbf, _buf, _size) write(_dbf->desc, _buf, _size)
#define __lseek(_dbf, _off, _whn) lseek(_dbf->desc, _off, _whn)
#if HAVE_FSYNC
#define __fsync(_dbf) fsync(_dbf->desc)
#else
#define __fsync(_dbf) { sync(); sync(); }
#endif
#endif
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