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Viewing: /usr/include/gdbm.h
/* gdbm.h - The include file for dbm users. -*- c -*- */
/* This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
Copyright (C) 1990-2022 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. If not, see <http://www.gnu.org/licenses/>.
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
*************************************************************************/
/* Protection for multiple includes. */
#ifndef _GDBM_H_
# define _GDBM_H_
# include <stdio.h>
# include <sys/types.h>
/* GDBM C++ support */
# if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
# endif
/* Parameters to gdbm_open for READERS, WRITERS, and WRITERS who
can create the database. */
# define GDBM_READER 0 /* A reader. */
# define GDBM_WRITER 1 /* A writer. */
# define GDBM_WRCREAT 2 /* A writer. Create the db if needed. */
# define GDBM_NEWDB 3 /* A writer. Always create a new db. */
# define GDBM_OPENMASK 7 /* Mask for the above. */
# define GDBM_FAST 0x0010 /* Write fast! => No fsyncs. OBSOLETE. */
# define GDBM_SYNC 0x0020 /* Sync operations to the disk. */
# define GDBM_NOLOCK 0x0040 /* Don't do file locking operations. */
# define GDBM_NOMMAP 0x0080 /* Don't use mmap(). */
# define GDBM_CLOEXEC 0x0100 /* Close the underlying fd on exec(3) */
# define GDBM_BSEXACT 0x0200 /* Don't adjust block_size. Bail out with
GDBM_BLOCK_SIZE_ERROR error if unable to
set it. */
# define GDBM_CLOERROR 0x0400 /* Only for gdbm_fd_open: close fd on error. */
# define GDBM_XVERIFY 0x0800 /* Additional consistency checks. */
# define GDBM_PREREAD 0x1000 /* Enable pre-fault reading of mmapped regions. */
# define GDBM_NUMSYNC 0x2000 /* Enable the numsync extension */
/* Parameters to gdbm_store for simple insertion or replacement in the
case that the key is already in the database. */
# define GDBM_INSERT 0 /* Never replace old data with new. */
# define GDBM_REPLACE 1 /* Always replace old data with new. */
/* Parameters to gdbm_setopt, specifying the type of operation to perform. */
# define GDBM_SETCACHESIZE 1 /* Set the cache size. */
# define GDBM_FASTMODE 2 /* Toggle fast mode. OBSOLETE. */
# define GDBM_SETSYNCMODE 3 /* Turn on or off sync operations. */
# define GDBM_SETCENTFREE 4 /* Keep all free blocks in the header. */
# define GDBM_SETCOALESCEBLKS 5 /* Attempt to coalesce free blocks. */
# define GDBM_SETMAXMAPSIZE 6 /* Set maximum mapped memory size */
# define GDBM_SETMMAP 7 /* Toggle mmap mode */
/* Compatibility defines: */
# define GDBM_CACHESIZE GDBM_SETCACHESIZE
# define GDBM_SYNCMODE GDBM_SETSYNCMODE
# define GDBM_CENTFREE GDBM_SETCENTFREE
# define GDBM_COALESCEBLKS GDBM_SETCOALESCEBLKS
# define GDBM_GETFLAGS 8 /* Get gdbm_open flags */
# define GDBM_GETMMAP 9 /* Get mmap status */
# define GDBM_GETCACHESIZE 10 /* Get current cache side */
# define GDBM_GETSYNCMODE 11 /* Get synch mode */
# define GDBM_GETCENTFREE 12 /* Get "centfree" status */
# define GDBM_GETCOALESCEBLKS 13 /* Get free block coalesce status */
# define GDBM_GETMAXMAPSIZE 14 /* Get maximum mapped memory size */
# define GDBM_GETDBNAME 15 /* Return database file name */
# define GDBM_GETBLOCKSIZE 16 /* Return block size */
# define GDBM_GETDBFORMAT 17 /* Return the database format */
# define GDBM_GETDIRDEPTH 18 /* Directory depth: number of initial (most
significant) bits in hash interpreted as
index to the directory. */
# define GDBM_GETBUCKETSIZE 19 /* Get number of elements per bucket */
# define GDBM_GETCACHEAUTO 20 /* Get the value of cache auto-adjustment */
# define GDBM_SETCACHEAUTO 21 /* Set the value of cache auto-adjustment */
# define GDBM_CACHE_AUTO 0
typedef unsigned long long int gdbm_count_t;
/* The data and key structure. */
typedef struct
{
char *dptr;
int dsize;
} datum;
/* A pointer to the GDBM file. */
typedef struct gdbm_file_info *GDBM_FILE;
/* External variable, the gdbm build release string. */
extern const char *gdbm_version;
# define GDBM_VERSION_MAJOR 1
# define GDBM_VERSION_MINOR 23
# define GDBM_VERSION_PATCH 0
extern int const gdbm_version_number[3];
/* GDBM external functions. */
extern GDBM_FILE gdbm_fd_open (int fd, const char *file_name, int block_size,
int flags, void (*fatal_func) (const char *));
extern GDBM_FILE gdbm_open (const char *, int, int, int,
void (*)(const char *));
extern int gdbm_close (GDBM_FILE);
extern int gdbm_store (GDBM_FILE, datum, datum, int);
extern datum gdbm_fetch (GDBM_FILE, datum);
extern int gdbm_delete (GDBM_FILE, datum);
extern datum gdbm_firstkey (GDBM_FILE);
extern datum gdbm_nextkey (GDBM_FILE, datum);
extern int gdbm_reorganize (GDBM_FILE);
extern int gdbm_sync (GDBM_FILE);
extern int gdbm_failure_atomic (GDBM_FILE, const char *, const char *);
extern int gdbm_convert (GDBM_FILE dbf, int flag);
enum gdbm_latest_snapshot_status
{
GDBM_SNAPSHOT_OK, /* Selected the right snapshot. */
GDBM_SNAPSHOT_BAD, /* Neither snapshot is readable. */
GDBM_SNAPSHOT_ERR, /* Error selecting snapshot. Inspect errno. */
GDBM_SNAPSHOT_SAME, /* Snapshot numsync and dates are the same. */
GDBM_SNAPSHOT_SUSPICIOUS /* Selected snapshot is unreliable: numsyncs
differ by more than 1. */
};
extern int gdbm_latest_snapshot (const char *, const char *, const char **);
extern int gdbm_exists (GDBM_FILE, datum);
extern int gdbm_setopt (GDBM_FILE, int, void *, int);
extern int gdbm_fdesc (GDBM_FILE);
extern int gdbm_export (GDBM_FILE, const char *, int, int);
extern int gdbm_export_to_file (GDBM_FILE dbf, FILE *fp);
extern int gdbm_import (GDBM_FILE, const char *, int);
extern int gdbm_import_from_file (GDBM_FILE dbf, FILE *fp, int flag);
extern int gdbm_count (GDBM_FILE dbf, gdbm_count_t *pcount);
extern int gdbm_bucket_count (GDBM_FILE dbf, size_t *pcount);
extern int gdbm_avail_verify (GDBM_FILE dbf);
typedef struct gdbm_recovery_s
{
/* Input members.
These are initialized before call to gdbm_recover. The flags argument
specifies which of them are initialized. */
void (*errfun) (void *data, char const *fmt, ...);
void *data;
size_t max_failed_keys;
size_t max_failed_buckets;
size_t max_failures;
/* Output members.
The gdbm_recover function fills these before returning. */
size_t recovered_keys;
size_t recovered_buckets;
size_t failed_keys;
size_t failed_buckets;
size_t duplicate_keys;
char *backup_name;
} gdbm_recovery;
#define GDBM_RCVR_DEFAULT 0x00 /* Default settings */
#define GDBM_RCVR_ERRFUN 0x01 /* errfun is initialized */
#define GDBM_RCVR_MAX_FAILED_KEYS 0x02 /* max_failed_keys is initialized */
#define GDBM_RCVR_MAX_FAILED_BUCKETS 0x04 /* max_failed_buckets is initialized */
#define GDBM_RCVR_MAX_FAILURES 0x08 /* max_failures is initialized */
#define GDBM_RCVR_BACKUP 0x10 /* Keep backup copy of the
original database on success */
#define GDBM_RCVR_FORCE 0x20 /* Force recovery by skipping the
check pass */
extern int gdbm_recover (GDBM_FILE dbf, gdbm_recovery *rcvr, int flags);
#define GDBM_DUMP_FMT_BINARY 0
#define GDBM_DUMP_FMT_ASCII 1
#define GDBM_META_MASK_MODE 0x01
#define GDBM_META_MASK_OWNER 0x02
extern int gdbm_dump (GDBM_FILE, const char *, int fmt, int open_flags,
int mode);
extern int gdbm_dump_to_file (GDBM_FILE, FILE *, int fmt);
extern int gdbm_load (GDBM_FILE *, const char *, int replace,
int meta_flags,
unsigned long *line);
extern int gdbm_load_from_file (GDBM_FILE *, FILE *, int replace,
int meta_flags,
unsigned long *line);
extern int gdbm_copy_meta (GDBM_FILE dst, GDBM_FILE src);
enum
{
GDBM_NO_ERROR = 0,
GDBM_MALLOC_ERROR = 1,
GDBM_BLOCK_SIZE_ERROR = 2,
GDBM_FILE_OPEN_ERROR = 3,
GDBM_FILE_WRITE_ERROR = 4,
GDBM_FILE_SEEK_ERROR = 5,
GDBM_FILE_READ_ERROR = 6,
GDBM_BAD_MAGIC_NUMBER = 7,
GDBM_EMPTY_DATABASE = 8,
GDBM_CANT_BE_READER = 9,
GDBM_CANT_BE_WRITER = 10,
GDBM_READER_CANT_DELETE = 11,
GDBM_READER_CANT_STORE = 12,
GDBM_READER_CANT_REORGANIZE = 13,
GDBM_UNKNOWN_ERROR = 14,
GDBM_ITEM_NOT_FOUND = 15,
GDBM_REORGANIZE_FAILED = 16,
GDBM_CANNOT_REPLACE = 17,
GDBM_MALFORMED_DATA = 18,
GDBM_ILLEGAL_DATA = GDBM_MALFORMED_DATA,
GDBM_OPT_ALREADY_SET = 19,
GDBM_OPT_BADVAL = 20,
GDBM_OPT_ILLEGAL = GDBM_OPT_BADVAL,
GDBM_BYTE_SWAPPED = 21,
GDBM_BAD_FILE_OFFSET = 22,
GDBM_BAD_OPEN_FLAGS = 23,
GDBM_FILE_STAT_ERROR = 24,
GDBM_FILE_EOF = 25,
GDBM_NO_DBNAME = 26,
GDBM_ERR_FILE_OWNER = 27,
GDBM_ERR_FILE_MODE = 28,
GDBM_NEED_RECOVERY = 29,
GDBM_BACKUP_FAILED = 30,
GDBM_DIR_OVERFLOW = 31,
GDBM_BAD_BUCKET = 32,
GDBM_BAD_HEADER = 33,
GDBM_BAD_AVAIL = 34,
GDBM_BAD_HASH_TABLE = 35,
GDBM_BAD_DIR_ENTRY = 36,
GDBM_FILE_CLOSE_ERROR = 37,
GDBM_FILE_SYNC_ERROR = 38,
GDBM_FILE_TRUNCATE_ERROR = 39,
GDBM_BUCKET_CACHE_CORRUPTED = 40,
GDBM_BAD_HASH_ENTRY = 41,
GDBM_ERR_SNAPSHOT_CLONE = 42,
GDBM_ERR_REALPATH = 43,
GDBM_ERR_USAGE = 44
};
# define _GDBM_MIN_ERRNO 0
# define _GDBM_MAX_ERRNO GDBM_ERR_USAGE
/* This one was never used and will be removed in the future */
# define GDBM_UNKNOWN_UPDATE GDBM_UNKNOWN_ERROR
typedef int gdbm_error;
extern int *gdbm_errno_location (void);
#define gdbm_errno (*gdbm_errno_location ())
extern const char * const gdbm_errlist[];
extern int const gdbm_syserr[];
extern gdbm_error gdbm_last_errno (GDBM_FILE dbf);
extern int gdbm_last_syserr (GDBM_FILE dbf);
extern void gdbm_set_errno (GDBM_FILE dbf, gdbm_error ec, int fatal);
extern void gdbm_clear_error (GDBM_FILE dbf);
extern int gdbm_needs_recovery (GDBM_FILE dbf);
extern int gdbm_check_syserr (gdbm_error n);
/* extra prototypes */
extern const char *gdbm_strerror (gdbm_error);
extern const char *gdbm_db_strerror (GDBM_FILE dbf);
extern int gdbm_version_cmp (int const a[], int const b[]);
#if 0
# define GDBM_DEBUG_ENABLE 1
typedef void (*gdbm_debug_printer_t) (char const *, ...);
extern gdbm_debug_printer_t gdbm_debug_printer;
extern int gdbm_debug_flags;
# define GDBM_DEBUG_ERR 0x00000001
# define GDBM_DEBUG_OPEN 0x00000002
# define GDBM_DEBUG_READ 0x00000004
# define GDBM_DEBUG_STORE 0x00000008
# define GDBM_DEBUG_LOOKUP 0x00000010
# define GDBM_DEBUG_ALL 0xffffffff
extern int gdbm_debug_token (char const *tok);
extern void gdbm_debug_parse_state (int (*f) (void *, int, char const *),
void *d);
extern void gdbm_debug_datum (datum dat, char const *pfx);
#endif
/* Cache statistics */
struct gdbm_cache_stat
{
off_t adr;
size_t hits;
};
void gdbm_get_cache_stats (GDBM_FILE dbf,
size_t *access_count,
size_t *cache_hits,
size_t *cache_count,
struct gdbm_cache_stat *bstat,
size_t nstat);
# if defined(__cplusplus) || defined(c_plusplus)
}
# endif
#endif