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dianjixz
334 lines
12 KiB
C
334 lines
12 KiB
C
/* gdbm.h - The include file for dbm users. -*- c -*- */
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/* This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
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Copyright (C) 1990-2024 Free Software Foundation, Inc.
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GDBM is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GDBM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GDBM. If not, see <http://www.gnu.org/licenses/>.
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You may contact the author by:
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e-mail: phil@cs.wwu.edu
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us-mail: Philip A. Nelson
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Computer Science Department
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Western Washington University
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Bellingham, WA 98226
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*************************************************************************/
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/* Protection for multiple includes. */
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#ifndef _GDBM_H_
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# define _GDBM_H_
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# include <stdio.h>
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# include <sys/types.h>
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/* GDBM C++ support */
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# if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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# endif
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/* Parameters to gdbm_open for READERS, WRITERS, and WRITERS who
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can create the database. */
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# define GDBM_READER 0 /* A reader. */
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# define GDBM_WRITER 1 /* A writer. */
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# define GDBM_WRCREAT 2 /* A writer. Create the db if needed. */
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# define GDBM_NEWDB 3 /* A writer. Always create a new db. */
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# define GDBM_OPENMASK 7 /* Mask for the above. */
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# define GDBM_FAST 0x0010 /* Write fast! => No fsyncs. OBSOLETE. */
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# define GDBM_SYNC 0x0020 /* Sync operations to the disk. */
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# define GDBM_NOLOCK 0x0040 /* Don't do file locking operations. */
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# define GDBM_NOMMAP 0x0080 /* Don't use mmap(). */
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# define GDBM_CLOEXEC 0x0100 /* Close the underlying fd on exec(3) */
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# define GDBM_BSEXACT 0x0200 /* Don't adjust block_size. Bail out with GDBM_BLOCK_SIZE_ERROR error if unable to set it. */
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# define GDBM_CLOERROR 0x0400 /* Only for gdbm_fd_open: close fd on error. */
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# define GDBM_XVERIFY 0x0800 /* Additional consistency checks. */
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# define GDBM_PREREAD 0x1000 /* Enable pre-fault reading of mmapped regions. */
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# define GDBM_NUMSYNC 0x2000 /* Enable the numsync extension */
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/* Parameters to gdbm_store for simple insertion or replacement in the
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case that the key is already in the database. */
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# define GDBM_INSERT 0 /* Never replace old data with new. */
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# define GDBM_REPLACE 1 /* Always replace old data with new. */
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/* Parameters to gdbm_setopt, specifying the type of operation to perform. */
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# define GDBM_SETCACHESIZE 1 /* Set the cache size. */
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# define GDBM_FASTMODE 2 /* Toggle fast mode. OBSOLETE. */
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# define GDBM_SETSYNCMODE 3 /* Turn on or off sync operations. */
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# define GDBM_SETCENTFREE 4 /* Keep all free blocks in the header. */
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# define GDBM_SETCOALESCEBLKS 5 /* Attempt to coalesce free blocks. */
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# define GDBM_SETMAXMAPSIZE 6 /* Set maximum mapped memory size */
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# define GDBM_SETMMAP 7 /* Toggle mmap mode */
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/* Compatibility defines: */
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# define GDBM_CACHESIZE GDBM_SETCACHESIZE
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# define GDBM_SYNCMODE GDBM_SETSYNCMODE
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# define GDBM_CENTFREE GDBM_SETCENTFREE
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# define GDBM_COALESCEBLKS GDBM_SETCOALESCEBLKS
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# define GDBM_GETFLAGS 8 /* Get gdbm_open flags */
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# define GDBM_GETMMAP 9 /* Get mmap status */
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# define GDBM_GETCACHESIZE 10 /* Get current cache side */
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# define GDBM_GETSYNCMODE 11 /* Get synch mode */
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# define GDBM_GETCENTFREE 12 /* Get "centfree" status */
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# define GDBM_GETCOALESCEBLKS 13 /* Get free block coalesce status */
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# define GDBM_GETMAXMAPSIZE 14 /* Get maximum mapped memory size */
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# define GDBM_GETDBNAME 15 /* Return database file name */
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# define GDBM_GETBLOCKSIZE 16 /* Return block size */
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# define GDBM_GETDBFORMAT 17 /* Return the database format */
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# define GDBM_GETDIRDEPTH 18 /* Directory depth: number of initial (mostsignificant) bits in hash interpreted asindex to the directory. */
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# define GDBM_GETBUCKETSIZE 19 /* Get number of elements per bucket */
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# define GDBM_GETCACHEAUTO 20 /* Get the value of cache auto-adjustment */
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# define GDBM_SETCACHEAUTO 21 /* Set the value of cache auto-adjustment */
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# define GDBM_CACHE_AUTO 0
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typedef unsigned long long int gdbm_count_t;
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/* The data and key structure. */
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typedef struct
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{
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char *dptr;
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int dsize;
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} datum;
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/* A pointer to the GDBM file. */
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typedef struct gdbm_file_info *GDBM_FILE;
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/* External variable, the gdbm build release string. */
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extern const char *gdbm_version;
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# define GDBM_VERSION_MAJOR 1
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# define GDBM_VERSION_MINOR 24
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# define GDBM_VERSION_PATCH 0
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extern int const gdbm_version_number[3];
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/* GDBM external functions. */
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extern GDBM_FILE gdbm_fd_open (int fd, const char *file_name, int block_size,
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int flags, void (*fatal_func) (const char *));
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extern GDBM_FILE gdbm_open (const char *, int, int, int,
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void (*)(const char *));
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extern int gdbm_close (GDBM_FILE);
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extern int gdbm_store (GDBM_FILE, datum, datum, int);
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extern datum gdbm_fetch (GDBM_FILE, datum);
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extern int gdbm_delete (GDBM_FILE, datum);
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extern datum gdbm_firstkey (GDBM_FILE);
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extern datum gdbm_nextkey (GDBM_FILE, datum);
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extern int gdbm_reorganize (GDBM_FILE);
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extern int gdbm_sync (GDBM_FILE);
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extern int gdbm_failure_atomic (GDBM_FILE, const char *, const char *);
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extern int gdbm_convert (GDBM_FILE dbf, int flag);
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enum gdbm_latest_snapshot_status
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{
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GDBM_SNAPSHOT_OK, /* Selected the right snapshot. */
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GDBM_SNAPSHOT_BAD, /* Neither snapshot is readable. */
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GDBM_SNAPSHOT_ERR, /* Error selecting snapshot. Inspect errno. */
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GDBM_SNAPSHOT_SAME, /* Snapshot numsync and dates are the same. */
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GDBM_SNAPSHOT_SUSPICIOUS /* Selected snapshot is unreliable: numsyncs differ by more than 1. */
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};
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extern int gdbm_latest_snapshot (const char *, const char *, const char **);
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extern int gdbm_exists (GDBM_FILE, datum);
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extern int gdbm_setopt (GDBM_FILE, int, void *, int);
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extern int gdbm_fdesc (GDBM_FILE);
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extern int gdbm_export (GDBM_FILE, const char *, int, int);
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extern int gdbm_export_to_file (GDBM_FILE dbf, FILE *fp);
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extern int gdbm_import (GDBM_FILE, const char *, int);
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extern int gdbm_import_from_file (GDBM_FILE dbf, FILE *fp, int flag);
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extern int gdbm_count (GDBM_FILE dbf, gdbm_count_t *pcount);
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extern int gdbm_bucket_count (GDBM_FILE dbf, size_t *pcount);
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extern int gdbm_avail_verify (GDBM_FILE dbf);
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typedef struct gdbm_recovery_s
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{
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/* Input members.
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These are initialized before call to gdbm_recover. The flags argument
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specifies which of them are initialized. */
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void (*errfun) (void *data, char const *fmt, ...);
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void *data;
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size_t max_failed_keys;
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size_t max_failed_buckets;
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size_t max_failures;
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/* Output members.
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The gdbm_recover function fills these before returning. */
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size_t recovered_keys;
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size_t recovered_buckets;
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size_t failed_keys;
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size_t failed_buckets;
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size_t duplicate_keys;
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char *backup_name;
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} gdbm_recovery;
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#define GDBM_RCVR_DEFAULT 0x00 /* Default settings */
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#define GDBM_RCVR_ERRFUN 0x01 /* errfun is initialized */
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#define GDBM_RCVR_MAX_FAILED_KEYS 0x02 /* max_failed_keys is initialized */
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#define GDBM_RCVR_MAX_FAILED_BUCKETS 0x04 /* max_failed_buckets is initialized */
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#define GDBM_RCVR_MAX_FAILURES 0x08 /* max_failures is initialized */
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#define GDBM_RCVR_BACKUP 0x10 /* Keep backup copy of theoriginal data base on success */
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#define GDBM_RCVR_FORCE 0x20 /* Force recovery by skipping the check pass */
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extern int gdbm_recover (GDBM_FILE dbf, gdbm_recovery *rcvr, int flags);
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#define GDBM_DUMP_FMT_BINARY 0
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#define GDBM_DUMP_FMT_ASCII 1
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#define GDBM_META_MASK_MODE 0x01
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#define GDBM_META_MASK_OWNER 0x02
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extern int gdbm_dump (GDBM_FILE, const char *, int fmt, int open_flags,
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int mode);
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extern int gdbm_dump_to_file (GDBM_FILE, FILE *, int fmt);
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extern int gdbm_load (GDBM_FILE *, const char *, int replace,
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int meta_flags,
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unsigned long *line);
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extern int gdbm_load_from_file (GDBM_FILE *, FILE *, int replace,
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int meta_flags,
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unsigned long *line);
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extern int gdbm_load_from_file_ext (GDBM_FILE *pdbf, FILE *fp,
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int mode, int replace,
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int meta_mask,
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unsigned long *line);
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extern int gdbm_copy_meta (GDBM_FILE dst, GDBM_FILE src);
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enum
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{
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GDBM_NO_ERROR = 0,
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GDBM_MALLOC_ERROR = 1,
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GDBM_BLOCK_SIZE_ERROR = 2,
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GDBM_FILE_OPEN_ERROR = 3,
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GDBM_FILE_WRITE_ERROR = 4,
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GDBM_FILE_SEEK_ERROR = 5,
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GDBM_FILE_READ_ERROR = 6,
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GDBM_BAD_MAGIC_NUMBER = 7,
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GDBM_EMPTY_DATABASE = 8,
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GDBM_CANT_BE_READER = 9,
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GDBM_CANT_BE_WRITER = 10,
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GDBM_READER_CANT_DELETE = 11,
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GDBM_READER_CANT_STORE = 12,
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GDBM_READER_CANT_REORGANIZE = 13,
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GDBM_UNKNOWN_ERROR = 14,
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GDBM_ITEM_NOT_FOUND = 15,
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GDBM_REORGANIZE_FAILED = 16,
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GDBM_CANNOT_REPLACE = 17,
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GDBM_MALFORMED_DATA = 18,
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GDBM_ILLEGAL_DATA = GDBM_MALFORMED_DATA,
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GDBM_OPT_ALREADY_SET = 19,
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GDBM_OPT_BADVAL = 20,
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GDBM_OPT_ILLEGAL = GDBM_OPT_BADVAL,
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GDBM_BYTE_SWAPPED = 21,
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GDBM_BAD_FILE_OFFSET = 22,
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GDBM_BAD_OPEN_FLAGS = 23,
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GDBM_FILE_STAT_ERROR = 24,
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GDBM_FILE_EOF = 25,
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GDBM_NO_DBNAME = 26,
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GDBM_ERR_FILE_OWNER = 27,
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GDBM_ERR_FILE_MODE = 28,
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GDBM_NEED_RECOVERY = 29,
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GDBM_BACKUP_FAILED = 30,
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GDBM_DIR_OVERFLOW = 31,
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GDBM_BAD_BUCKET = 32,
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GDBM_BAD_HEADER = 33,
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GDBM_BAD_AVAIL = 34,
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GDBM_BAD_HASH_TABLE = 35,
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GDBM_BAD_DIR_ENTRY = 36,
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GDBM_FILE_CLOSE_ERROR = 37,
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GDBM_FILE_SYNC_ERROR = 38,
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GDBM_FILE_TRUNCATE_ERROR = 39,
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GDBM_BUCKET_CACHE_CORRUPTED = 40,
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GDBM_BAD_HASH_ENTRY = 41,
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GDBM_ERR_SNAPSHOT_CLONE = 42,
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GDBM_ERR_REALPATH = 43,
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GDBM_ERR_USAGE = 44
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};
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# define _GDBM_MIN_ERRNO 0
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# define _GDBM_MAX_ERRNO GDBM_ERR_USAGE
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/* This one was never used and will be removed in the future */
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# define GDBM_UNKNOWN_UPDATE GDBM_UNKNOWN_ERROR
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typedef int gdbm_error;
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extern int *gdbm_errno_location (void);
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#define gdbm_errno (*gdbm_errno_location ())
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extern const char * const gdbm_errlist[];
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extern int const gdbm_syserr[];
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extern gdbm_error gdbm_last_errno (GDBM_FILE dbf);
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extern int gdbm_last_syserr (GDBM_FILE dbf);
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extern void gdbm_set_errno (GDBM_FILE dbf, gdbm_error ec, int fatal);
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extern void gdbm_clear_error (GDBM_FILE dbf);
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extern int gdbm_needs_recovery (GDBM_FILE dbf);
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extern int gdbm_check_syserr (gdbm_error n);
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/* extra prototypes */
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extern const char *gdbm_strerror (gdbm_error);
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extern const char *gdbm_db_strerror (GDBM_FILE dbf);
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extern int gdbm_version_cmp (int const a[], int const b[]);
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#if 0
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# define GDBM_DEBUG_ENABLE 1
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typedef void (*gdbm_debug_printer_t) (char const *, ...);
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extern gdbm_debug_printer_t gdbm_debug_printer;
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extern int gdbm_debug_flags;
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# define GDBM_DEBUG_ERR 0x00000001
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# define GDBM_DEBUG_OPEN 0x00000002
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# define GDBM_DEBUG_READ 0x00000004
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# define GDBM_DEBUG_STORE 0x00000008
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# define GDBM_DEBUG_LOOKUP 0x00000010
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# define GDBM_DEBUG_ALL 0xffffffff
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extern int gdbm_debug_token (char const *tok);
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extern void gdbm_debug_parse_state (int (*f) (void *, int, char const *),
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void *d);
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extern void gdbm_debug_datum (datum dat, char const *pfx);
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#endif
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/* Cache statistics */
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struct gdbm_cache_stat
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{
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off_t adr;
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size_t hits;
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};
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void gdbm_get_cache_stats (GDBM_FILE dbf,
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size_t *access_count,
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size_t *cache_hits,
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size_t *cache_count,
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struct gdbm_cache_stat *bstat,
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size_t nstat);
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# if defined(__cplusplus) || defined(c_plusplus)
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}
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# endif
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#endif
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