home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Frozen Fish 1: Amiga
/
FrozenFish-Apr94.iso
/
bbs
/
gnu
/
gdbm-1.7.1.tar.gz
/
gdbm-1.7.1.tar
/
gdbm-1.7.1
/
systems.h
< prev
next >
Wrap
C/C++ Source or Header
|
1993-11-16
|
4KB
|
154 lines
/* systems.h - Most of the system dependant code and defines are here. */
/* 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@wwu.edu
us-mail: Philip A. Nelson
Computer Science Department
Western Washington University
Bellingham, WA 98226
*************************************************************************/
#ifdef __GNUC__
#define alloca __builtin_alloca
#else /* not __GNUC__ */
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif /* not HAVE_ALLOCA_H */
#endif /* not __GNUC__ */
/* 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 L_SET
#define L_SET SEEK_SET
#endif
/* Do we have flock? (BSD...) */
#if HAVE_FLOCK
#ifndef LOCK_SH
#define LOCK_SH 1
#endif
#ifndef LOCK_EX
#define LOCK_EX 2
#endif
#ifndef LOCK_NB
#define LOCK_NB 4
#endif
#ifndef LOCK_UN
#define LOCK_UN 8
#endif
#define UNLOCK_FILE(dbf) flock (dbf->desc, LOCK_UN)
#define READLOCK_FILE(dbf) lock_val = flock (dbf->desc, LOCK_SH + LOCK_NB)
#define WRITELOCK_FILE(dbf) lock_val = flock (dbf->desc, LOCK_EX + LOCK_NB)
#else
/* Assume it is done like System V. */
#define UNLOCK_FILE(dbf) \
{ \
struct flock flock; \
flock.l_type = F_UNLCK; \
flock.l_whence = 0; \
flock.l_start = flock.l_len = 0L; \
fcntl (dbf->desc, F_SETLK, &flock); \
}
#define READLOCK_FILE(dbf) \
{ \
struct flock flock; \
flock.l_type = F_RDLCK; \
flock.l_whence = 0; \
flock.l_start = flock.l_len = 0L; \
lock_val = fcntl (dbf->desc, F_SETLK, &flock); \
}
#define WRITELOCK_FILE(dbf) \
{ \
struct flock flock; \
flock.l_type = F_WRLCK; \
flock.l_whence = 0; \
flock.l_start = flock.l_len = 0L; \
lock_val = fcntl (dbf->desc, F_SETLK, &flock); \
}
#endif
/* Do we have bcopy? */
#if !HAVE_BCOPY
#include <memory.h>
#define bcmp(d1, d2, n) memcmp(d1, d2, n)
#define bcopy(d1, d2, n) memcpy(d2, d1, n)
#endif
/* Do we have fsync? */
#if !HAVE_FSYNC
#define fsync(f) {sync(); sync();}
#endif
/* Default block size. Some systems do not have blocksize in their
stat record. This code uses the BSD blocksize from stat. */
#if HAVE_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
/* Do we have 32bit or 64bit longs? */
#if LONG_64_BITS || !INT_16_BITS
typedef int word_t;
#else
typedef long word_t;
#endif