1 #define STANDALONE 1 2 /* 3 * Database functions 4 * Copyright (C) Andrew Tridgell 1999 5 * 6 * Redistribution and use in source and binary forms are permitted 7 * provided that the above copyright notice and this paragraph are 8 * duplicated in all such forms AND provided that this software or 9 * any derived work is only used as part of the PPP daemon (pppd) 10 * and related utilities. 11 * The name of the author may not be used to endorse or promote products 12 * derived from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * Note: this software is also available under the Gnu Public License 18 * version 2 or later. 19 */ 20 21 typedef unsigned tdb_len; 22 typedef unsigned tdb_off; 23 24 #define TDB_MAGIC_FOOD "TDB file\n" 25 26 /* this is stored at the front of every database */ 27 struct tdb_header { 28 char magic_food[32]; /* for /etc/magic */ 29 unsigned version; /* version of the code */ 30 unsigned hash_size; /* number of hash entries */ 31 }; 32 33 typedef struct { 34 char *dptr; 35 size_t dsize; 36 } TDB_DATA; 37 38 /* this is the context structure that is returned from a db open */ 39 typedef struct { 40 char *name; /* the name of the database */ 41 void *map_ptr; /* where it is currently mapped */ 42 int fd; /* open file descriptor for the database */ 43 tdb_len map_size; /* how much space has been mapped */ 44 int read_only; /* opened read-only */ 45 int *locked; /* set if we have a chain locked */ 46 int ecode; /* error code for last tdb error */ 47 struct tdb_header header; /* a cached copy of the header */ 48 } TDB_CONTEXT; 49 50 /* flags to tdb_store() */ 51 #define TDB_REPLACE 1 52 #define TDB_INSERT 2 53 54 /* flags for tdb_open() */ 55 #define TDB_CLEAR_IF_FIRST 1 56 57 /* error codes */ 58 enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK, 59 TDB_ERR_OOM, TDB_ERR_EXISTS}; 60 61 #if STANDALONE 62 TDB_CONTEXT *tdb_open(char *name, int hash_size, int tdb_flags, 63 int open_flags, mode_t mode); 64 char *tdb_errorstr(TDB_CONTEXT *tdb); 65 int tdb_writelock(TDB_CONTEXT *tdb); 66 int tdb_writeunlock(TDB_CONTEXT *tdb); 67 TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key); 68 int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key); 69 int tdb_store(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, int flag); 70 int tdb_close(TDB_CONTEXT *tdb); 71 TDB_DATA tdb_firstkey(TDB_CONTEXT *tdb); 72 TDB_DATA tdb_nextkey(TDB_CONTEXT *tdb, TDB_DATA key); 73 int tdb_traverse(TDB_CONTEXT *tdb, 74 int (*fn)(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state), 75 void *state); 76 int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key); 77 int tdb_chainlock(TDB_CONTEXT *tdb, TDB_DATA key); 78 int tdb_chainunlock(TDB_CONTEXT *tdb, TDB_DATA key); 79 #endif 80