release/src/router/ppp/pppd/tdb.h

   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_error(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 #endif