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80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
#define STANDALONE 1
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/*
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* Database functions
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* Copyright (C) Andrew Tridgell 1999
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms AND provided that this software or
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* any derived work is only used as part of the PPP daemon (pppd)
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* and related utilities.
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* The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Note: this software is also available under the Gnu Public License
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* version 2 or later.
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*/
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typedef unsigned tdb_len;
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typedef unsigned tdb_off;
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#define TDB_MAGIC_FOOD "TDB file\n"
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/* this is stored at the front of every database */
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struct tdb_header {
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char magic_food[32]; /* for /etc/magic */
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unsigned version; /* version of the code */
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unsigned hash_size; /* number of hash entries */
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};
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typedef struct {
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char *dptr;
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size_t dsize;
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} TDB_DATA;
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/* this is the context structure that is returned from a db open */
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typedef struct {
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char *name; /* the name of the database */
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void *map_ptr; /* where it is currently mapped */
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int fd; /* open file descriptor for the database */
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tdb_len map_size; /* how much space has been mapped */
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int read_only; /* opened read-only */
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int *locked; /* set if we have a chain locked */
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int ecode; /* error code for last tdb error */
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struct tdb_header header; /* a cached copy of the header */
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} TDB_CONTEXT;
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/* flags to tdb_store() */
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#define TDB_REPLACE 1
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#define TDB_INSERT 2
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/* flags for tdb_open() */
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#define TDB_CLEAR_IF_FIRST 1
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/* error codes */
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enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK,
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TDB_ERR_OOM, TDB_ERR_EXISTS};
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#if STANDALONE
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TDB_CONTEXT *tdb_open(char *name, int hash_size, int tdb_flags,
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int open_flags, mode_t mode);
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char *tdb_errorstr(TDB_CONTEXT *tdb);
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int tdb_writelock(TDB_CONTEXT *tdb);
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int tdb_writeunlock(TDB_CONTEXT *tdb);
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TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key);
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int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key);
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int tdb_store(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, int flag);
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int tdb_close(TDB_CONTEXT *tdb);
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TDB_DATA tdb_firstkey(TDB_CONTEXT *tdb);
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TDB_DATA tdb_nextkey(TDB_CONTEXT *tdb, TDB_DATA key);
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int tdb_traverse(TDB_CONTEXT *tdb,
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int (*fn)(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state),
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void *state);
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int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key);
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int tdb_chainlock(TDB_CONTEXT *tdb, TDB_DATA key);
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int tdb_chainunlock(TDB_CONTEXT *tdb, TDB_DATA key);
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#endif
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