#ifndef __TDB_H__
#define __TDB_H__
/*
Unix SMB/CIFS implementation.
trivial database library
Copyright (C) Andrew Tridgell 1999-2004
** NOTE! The following LGPL license applies to the tdb
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see .
*/
#ifdef __cplusplus
extern "C" {
#endif
#include
/**
* @defgroup tdb The tdb API
*
* tdb is a Trivial database. In concept, it is very much like GDBM, and BSD's
* DB except that it allows multiple simultaneous writers and uses locking
* internally to keep writers from trampling on each other. tdb is also
* extremely small.
*
* @section tdb_interface Interface
*
* The interface is very similar to gdbm except for the following:
*
*
* - different open interface. The tdb_open call is more similar to a
* traditional open()
* - no tdbm_reorganise() function
* - no tdbm_sync() function. No operations are cached in the library
* anyway
* - added a tdb_traverse() function for traversing the whole database
* - added transactions support
*
*
* A general rule for using tdb is that the caller frees any returned TDB_DATA
* structures. Just call free(p.dptr) to free a TDB_DATA return value called p.
* This is the same as gdbm.
*
* @{
*/
/** Flags to tdb_store() */
#define TDB_REPLACE 1 /** Unused */
#define TDB_INSERT 2 /** Don't overwrite an existing entry */
#define TDB_MODIFY 3 /** Don't create an existing entry */
/** Flags for tdb_open() */
#define TDB_DEFAULT 0 /** just a readability place holder */
#define TDB_CLEAR_IF_FIRST 1 /** If this is the first open, wipe the db */
#define TDB_INTERNAL 2 /** Don't store on disk */
#define TDB_NOLOCK 4 /** Don't do any locking */
#define TDB_NOMMAP 8 /** Don't use mmap */
#define TDB_CONVERT 16 /** Convert endian (internal use) */
#define TDB_BIGENDIAN 32 /** Header is big-endian (internal use) */
#define TDB_NOSYNC 64 /** Don't use synchronous transactions */
#define TDB_SEQNUM 128 /** Maintain a sequence number */
#define TDB_VOLATILE 256 /** Activate the per-hashchain freelist, default 5 */
#define TDB_ALLOW_NESTING 512 /** Allow transactions to nest */
#define TDB_DISALLOW_NESTING 1024 /** Disallow transactions to nest */
#define TDB_INCOMPATIBLE_HASH 2048 /** Better hashing: can't be opened by tdb < 1.2.6. */
/** The tdb error codes */
enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK,
TDB_ERR_OOM, TDB_ERR_EXISTS, TDB_ERR_NOLOCK, TDB_ERR_LOCK_TIMEOUT,
TDB_ERR_NOEXIST, TDB_ERR_EINVAL, TDB_ERR_RDONLY,
TDB_ERR_NESTING};
/** Debugging uses one of the following levels */
enum tdb_debug_level {TDB_DEBUG_FATAL = 0, TDB_DEBUG_ERROR,
TDB_DEBUG_WARNING, TDB_DEBUG_TRACE};
/** The tdb data structure */
typedef struct TDB_DATA {
unsigned char *dptr;
size_t dsize;
} TDB_DATA;
#ifndef PRINTF_ATTRIBUTE
#if (__GNUC__ >= 3)
/** Use gcc attribute to check printf fns. a1 is the 1-based index of
* the parameter containing the format, and a2 the index of the first
* argument. Note that some gcc 2.x versions don't handle this
* properly **/
#define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2)))
#else
#define PRINTF_ATTRIBUTE(a1, a2)
#endif
#endif
/** This is the context structure that is returned from a db open. */
typedef struct tdb_context TDB_CONTEXT;
typedef int (*tdb_traverse_func)(struct tdb_context *, TDB_DATA, TDB_DATA, void *);
typedef void (*tdb_log_func)(struct tdb_context *, enum tdb_debug_level, const char *, ...) PRINTF_ATTRIBUTE(3, 4);
typedef unsigned int (*tdb_hash_func)(TDB_DATA *key);
struct tdb_logging_context {
tdb_log_func log_fn;
void *log_private;
};
/**
* @brief Open the database and creating it if necessary.
*
* @param[in] name The name of the db to open.
*
* @param[in] hash_size The hash size is advisory, use zero for a default
* value.
*
* @param[in] tdb_flags The flags to use to open the db:\n\n
* TDB_CLEAR_IF_FIRST - Clear database if we are the
* only one with it open\n
* TDB_INTERNAL - Don't use a file, instead store the
* data in memory. The filename is
* ignored in this case.\n
* TDB_NOLOCK - Don't do any locking\n
* TDB_NOMMAP - Don't use mmap\n
* TDB_NOSYNC - Don't synchronise transactions to disk\n
* TDB_SEQNUM - Maintain a sequence number\n
* TDB_VOLATILE - activate the per-hashchain freelist,
* default 5.\n
* TDB_ALLOW_NESTING - Allow transactions to nest.\n
* TDB_DISALLOW_NESTING - Disallow transactions to nest.\n
*
* @param[in] open_flags Flags for the open(2) function.
*
* @param[in] mode The mode for the open(2) function.
*
* @return A tdb context structure, NULL on error.
*/
struct tdb_context *tdb_open(const char *name, int hash_size, int tdb_flags,
int open_flags, mode_t mode);
/**
* @brief Open the database and creating it if necessary.
*
* This is like tdb_open(), but allows you to pass an initial logging and
* hash function. Be careful when passing a hash function - all users of the
* database must use the same hash function or you will get data corruption.
*
* @param[in] name The name of the db to open.
*
* @param[in] hash_size The hash size is advisory, use zero for a default
* value.
*
* @param[in] tdb_flags The flags to use to open the db:\n\n
* TDB_CLEAR_IF_FIRST - Clear database if we are the
* only one with it open\n
* TDB_INTERNAL - Don't use a file, instead store the
* data in memory. The filename is
* ignored in this case.\n
* TDB_NOLOCK - Don't do any locking\n
* TDB_NOMMAP - Don't use mmap\n
* TDB_NOSYNC - Don't synchronise transactions to disk\n
* TDB_SEQNUM - Maintain a sequence number\n
* TDB_VOLATILE - activate the per-hashchain freelist,
* default 5.\n
* TDB_ALLOW_NESTING - Allow transactions to nest.\n
* TDB_DISALLOW_NESTING - Disallow transactions to nest.\n
*
* @param[in] open_flags Flags for the open(2) function.
*
* @param[in] mode The mode for the open(2) function.
*
* @param[in] log_ctx The logging function to use.
*
* @param[in] hash_fn The hash function you want to use.
*
* @return A tdb context structure, NULL on error.
*
* @see tdb_open()
*/
struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
int open_flags, mode_t mode,
const struct tdb_logging_context *log_ctx,
tdb_hash_func hash_fn);
/**
* @brief Set the maximum number of dead records per hash chain.
*
* @param[in] tdb The database handle to set the maximum.
*
* @param[in] max_dead The maximum number of dead records per hash chain.
*/
void tdb_set_max_dead(struct tdb_context *tdb, int max_dead);
/**
* @brief Reopen a tdb.
*
* This can be used after a fork to ensure that we have an independent seek
* pointer from our parent and to re-establish locks.
*
* @param[in] tdb The database to reopen. It will be free'd on error!
*
* @return 0 on success, -1 on error.
*
* @note Don't call tdb_error() after this function cause the tdb context will
* be freed on error.
*/
int tdb_reopen(struct tdb_context *tdb);
/**
* @brief Reopen all tdb's
*
* If the parent is longlived (ie. a parent daemon architecture), we know it
* will keep it's active lock on a tdb opened with CLEAR_IF_FIRST. Thus for
* child processes we don't have to add an active lock. This is essential to
* improve performance on systems that keep POSIX locks as a non-scalable data
* structure in the kernel.
*
* @param[in] parent_longlived Wether the parent is longlived or not.
*
* @return 0 on success, -1 on error.
*/
int tdb_reopen_all(int parent_longlived);
/**
* @brief Set a different tdb logging function.
*
* @param[in] tdb The tdb to set the logging function.
*
* @param[in] log_ctx The logging function to set.
*/
void tdb_set_logging_function(struct tdb_context *tdb, const struct tdb_logging_context *log_ctx);
/**
* @brief Get the tdb last error code.
*
* @param[in] tdb The tdb to get the error code from.
*
* @return A TDB_ERROR code.
*
* @see TDB_ERROR
*/
enum TDB_ERROR tdb_error(struct tdb_context *tdb);
/**
* @brief Get a error string for the last tdb error
*
* @param[in] tdb The tdb to get the error code from.
*
* @return An error string.
*/
const char *tdb_errorstr(struct tdb_context *tdb);
/**
* @brief Fetch an entry in the database given a key.
*
* The caller must free the resulting data.
*
* @param[in] tdb The tdb to fetch the key.
*
* @param[in] key The key to fetch.
*
* @return The key entry found in the database, NULL on error with
* TDB_ERROR set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
TDB_DATA tdb_fetch(struct tdb_context *tdb, TDB_DATA key);
/**
* @brief Hand a record to a parser function without allocating it.
*
* This function is meant as a fast tdb_fetch alternative for large records
* that are frequently read. The "key" and "data" arguments point directly
* into the tdb shared memory, they are not aligned at any boundary.
*
* @warning The parser is called while tdb holds a lock on the record. DO NOT
* call other tdb routines from within the parser. Also, for good performance
* you should make the parser fast to allow parallel operations.
*
* @param[in] tdb The tdb to parse the record.
*
* @param[in] key The key to parse.
*
* @param[in] parser The parser to use to parse the data.
*
* @param[in] private_data A private data pointer which is passed to the parser
* function.
*
* @return -1 if the record was not found. If the record was found,
* the return value of "parser" is passed up to the caller.
*/
int tdb_parse_record(struct tdb_context *tdb, TDB_DATA key,
int (*parser)(TDB_DATA key, TDB_DATA data,
void *private_data),
void *private_data);
/**
* @brief Delete an entry in the database given a key.
*
* @param[in] tdb The tdb to delete the key.
*
* @param[in] key The key to delete.
*
* @return 0 on success, -1 if the key doesn't exist.
*/
int tdb_delete(struct tdb_context *tdb, TDB_DATA key);
/**
* @brief Store an element in the database.
*
* This replaces any existing element with the same key.
*
* @param[in] tdb The tdb to store the entry.
*
* @param[in] key The key to use to store the entry.
*
* @param[in] dbuf The data to store under the key.
*
* @param[in] flag The flags to store the key:\n\n
* TDB_INSERT: Don't overwrite an existing entry.\n
* TDB_MODIFY: Don't create a new entry\n
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_store(struct tdb_context *tdb, TDB_DATA key, TDB_DATA dbuf, int flag);
/**
* @brief Append data to an entry.
*
* If the entry doesn't exist, it will create a new one.
*
* @param[in] tdb The database to use.
*
* @param[in] key The key to append the data.
*
* @param[in] new_dbuf The data to append to the key.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_append(struct tdb_context *tdb, TDB_DATA key, TDB_DATA new_dbuf);
/**
* @brief Close a database.
*
* @param[in] tdb The database to close. The context will be free'd.
*
* @return 0 for success, -1 on error.
*
* @note Don't call tdb_error() after this function cause the tdb context will
* be freed on error.
*/
int tdb_close(struct tdb_context *tdb);
/**
* @brief Find the first entry in the database and return its key.
*
* The caller must free the returned data.
*
* @param[in] tdb The database to use.
*
* @return The first entry of the database, an empty TDB_DATA entry
* if the database is empty.
*/
TDB_DATA tdb_firstkey(struct tdb_context *tdb);
/**
* @brief Find the next entry in the database, returning its key.
*
* The caller must free the returned data.
*
* @param[in] tdb The database to use.
*
* @param[in] key The key from which you want the next key.
*
* @return The next entry of the current key, an empty TDB_DATA
* entry if there is no entry.
*/
TDB_DATA tdb_nextkey(struct tdb_context *tdb, TDB_DATA key);
/**
* @brief Traverse the entire database.
*
* While traversing the function fn(tdb, key, data, state) is called on each
* element. If fn is NULL then it is not called. A non-zero return value from
* fn() indicates that the traversal should stop. Traversal callbacks may not
* start transactions.
*
* @warning The data buffer given to the callback fn does NOT meet the alignment
* restrictions malloc gives you.
*
* @param[in] tdb The database to traverse.
*
* @param[in] fn The function to call on each entry.
*
* @param[in] private_data The private data which should be passed to the
* traversing function.
*
* @return The record count traversed, -1 on error.
*/
int tdb_traverse(struct tdb_context *tdb, tdb_traverse_func fn, void *private_data);
/**
* @brief Traverse the entire database.
*
* While traversing the database the function fn(tdb, key, data, state) is
* called on each element, but marking the database read only during the
* traversal, so any write operations will fail. This allows tdb to use read
* locks, which increases the parallelism possible during the traversal.
*
* @param[in] tdb The database to traverse.
*
* @param[in] fn The function to call on each entry.
*
* @param[in] private_data The private data which should be passed to the
* traversing function.
*
* @return The record count traversed, -1 on error.
*/
int tdb_traverse_read(struct tdb_context *tdb, tdb_traverse_func fn, void *private_data);
/**
* @brief Check if an entry in the database exists.
*
* @note 1 is returned if the key is found and 0 is returned if not found this
* doesn't match the conventions in the rest of this module, but is compatible
* with gdbm.
*
* @param[in] tdb The database to check if the entry exists.
*
* @param[in] key The key to check if the entry exists.
*
* @return 1 if the key is found, 0 if not.
*/
int tdb_exists(struct tdb_context *tdb, TDB_DATA key);
/**
* @brief Lock entire database with a write lock.
*
* @param[in] tdb The database to lock.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_lockall(struct tdb_context *tdb);
/**
* @brief Lock entire database with a write lock.
*
* This is the non-blocking call.
*
* @param[in] tdb The database to lock.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_lockall()
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_lockall_nonblock(struct tdb_context *tdb);
/**
* @brief Unlock entire database with write lock.
*
* @param[in] tdb The database to unlock.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_lockall()
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_unlockall(struct tdb_context *tdb);
/**
* @brief Lock entire database with a read lock.
*
* @param[in] tdb The database to lock.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_lockall_read(struct tdb_context *tdb);
/**
* @brief Lock entire database with a read lock.
*
* This is the non-blocking call.
*
* @param[in] tdb The database to lock.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_lockall_read()
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_lockall_read_nonblock(struct tdb_context *tdb);
/**
* @brief Unlock entire database with read lock.
*
* @param[in] tdb The database to unlock.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_lockall_read()
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_unlockall_read(struct tdb_context *tdb);
/**
* @brief Lock entire database with write lock - mark only.
*
* @todo Add more details.
*
* @param[in] tdb The database to mark.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_lockall_mark(struct tdb_context *tdb);
/**
* @brief Lock entire database with write lock - unmark only.
*
* @todo Add more details.
*
* @param[in] tdb The database to mark.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_lockall_unmark(struct tdb_context *tdb);
/**
* @brief Get the name of the current tdb file.
*
* This is useful for external logging functions.
*
* @param[in] tdb The database to get the name from.
*
* @return The name of the database.
*/
const char *tdb_name(struct tdb_context *tdb);
/**
* @brief Get the underlying file descriptor being used by tdb.
*
* This is useful for external routines that want to check the device/inode
* of the fd.
*
* @param[in] tdb The database to get the fd from.
*
* @return The file descriptor or -1.
*/
int tdb_fd(struct tdb_context *tdb);
/**
* @brief Get the current logging function.
*
* This is useful for external tdb routines that wish to log tdb errors.
*
* @param[in] tdb The database to get the logging function from.
*
* @return The logging function of the database.
*
* @see tdb_get_logging_private()
*/
tdb_log_func tdb_log_fn(struct tdb_context *tdb);
/**
* @brief Get the private data of the logging function.
*
* @param[in] tdb The database to get the data from.
*
* @return The private data pointer of the logging function.
*
* @see tdb_log_fn()
*/
void *tdb_get_logging_private(struct tdb_context *tdb);
/**
* @brief Start a transaction.
*
* All operations after the transaction start can either be committed with
* tdb_transaction_commit() or cancelled with tdb_transaction_cancel().
*
* If you call tdb_transaction_start() again on the same tdb context while a
* transaction is in progress, then the same transaction buffer is re-used. The
* number of tdb_transaction_{commit,cancel} operations must match the number
* of successful tdb_transaction_start() calls.
*
* Note that transactions are by default disk synchronous, and use a recover
* area in the database to automatically recover the database on the next open
* if the system crashes during a transaction. You can disable the synchronous
* transaction recovery setup using the TDB_NOSYNC flag, which will greatly
* speed up operations at the risk of corrupting your database if the system
* crashes.
*
* Operations made within a transaction are not visible to other users of the
* database until a successful commit.
*
* @param[in] tdb The database to start the transaction.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_transaction_start(struct tdb_context *tdb);
/**
* @brief Start a transaction, non-blocking.
*
* @param[in] tdb The database to start the transaction.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
* @see tdb_transaction_start()
*/
int tdb_transaction_start_nonblock(struct tdb_context *tdb);
/**
* @brief Prepare to commit a current transaction, for two-phase commits.
*
* Once prepared for commit, the only allowed calls are tdb_transaction_commit()
* or tdb_transaction_cancel(). Preparing allocates disk space for the pending
* updates, so a subsequent commit should succeed (barring any hardware
* failures).
*
* @param[in] tdb The database to prepare the commit.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_transaction_prepare_commit(struct tdb_context *tdb);
/**
* @brief Commit a current transaction.
*
* This updates the database and releases the current transaction locks.
*
* @param[in] tdb The database to commit the transaction.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_transaction_commit(struct tdb_context *tdb);
/**
* @brief Cancel a current transaction.
*
* This discards all write and lock operations that have been made since the
* transaction started.
*
* @param[in] tdb The tdb to cancel the transaction on.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_transaction_cancel(struct tdb_context *tdb);
/**
* @brief Get the tdb sequence number.
*
* Only makes sense if the writers opened with TDB_SEQNUM set. Note that this
* sequence number will wrap quite quickly, so it should only be used for a
* 'has something changed' test, not for code that relies on the count of the
* number of changes made. If you want a counter then use a tdb record.
*
* The aim of this sequence number is to allow for a very lightweight test of a
* possible tdb change.
*
* @param[in] tdb The database to get the sequence number from.
*
* @return The sequence number or 0.
*
* @see tdb_open()
* @see tdb_enable_seqnum()
*/
int tdb_get_seqnum(struct tdb_context *tdb);
/**
* @brief Get the hash size.
*
* @param[in] tdb The database to get the hash size from.
*
* @return The hash size.
*/
int tdb_hash_size(struct tdb_context *tdb);
/**
* @brief Get the map size.
*
* @param[in] tdb The database to get the map size from.
*
* @return The map size.
*/
size_t tdb_map_size(struct tdb_context *tdb);
/**
* @brief Get the tdb flags set during open.
*
* @param[in] tdb The database to get the flags form.
*
* @return The flags set to on the database.
*/
int tdb_get_flags(struct tdb_context *tdb);
/**
* @brief Add flags to the database.
*
* @param[in] tdb The database to add the flags.
*
* @param[in] flag The tdb flags to add.
*/
void tdb_add_flags(struct tdb_context *tdb, unsigned flag);
/**
* @brief Remove flags from the database.
*
* @param[in] tdb The database to remove the flags.
*
* @param[in] flag The tdb flags to remove.
*/
void tdb_remove_flags(struct tdb_context *tdb, unsigned flag);
/**
* @brief Enable sequence number handling on an open tdb.
*
* @param[in] tdb The database to enable sequence number handling.
*
* @see tdb_get_seqnum()
*/
void tdb_enable_seqnum(struct tdb_context *tdb);
/**
* @brief Increment the tdb sequence number.
*
* This only works if the tdb has been opened using the TDB_SEQNUM flag or
* enabled using tdb_enable_seqnum().
*
* @param[in] tdb The database to increment the sequence number.
*
* @see tdb_enable_seqnum()
* @see tdb_get_seqnum()
*/
void tdb_increment_seqnum_nonblock(struct tdb_context *tdb);
/**
* @brief Create a hash of the key.
*
* @param[in] key The key to hash
*
* @return The hash.
*/
unsigned int tdb_jenkins_hash(TDB_DATA *key);
/**
* @brief Check the consistency of the database.
*
* This check the consistency of the database calling back the check function
* (if non-NULL) on each record. If some consistency check fails, or the
* supplied check function returns -1, tdb_check returns -1, otherwise 0.
*
* @note The logging function (if set) will be called with additional
* information on the corruption found.
*
* @param[in] tdb The database to check.
*
* @param[in] check The check function to use.
*
* @param[in] private_data the private data to pass to the check function.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_check(struct tdb_context *tdb,
int (*check) (TDB_DATA key, TDB_DATA data, void *private_data),
void *private_data);
/**
* @brief Dump all possible records in a corrupt database.
*
* This is the only way to get data out of a database where tdb_check() fails.
* It will call walk() with anything which looks like a database record; this
* may well include invalid, incomplete or duplicate records.
*
* @param[in] tdb The database to check.
*
* @param[in] walk The walk function to use.
*
* @param[in] private_data the private data to pass to the walk function.
*
* @return 0 on success, -1 on error with error code set.
*
* @see tdb_error()
* @see tdb_errorstr()
*/
int tdb_rescue(struct tdb_context *tdb,
void (*walk) (TDB_DATA key, TDB_DATA data, void *private_data),
void *private_data);
/* @} ******************************************************************/
/* Low level locking functions: use with care */
int tdb_chainlock(struct tdb_context *tdb, TDB_DATA key);
int tdb_chainlock_nonblock(struct tdb_context *tdb, TDB_DATA key);
int tdb_chainunlock(struct tdb_context *tdb, TDB_DATA key);
int tdb_chainlock_read(struct tdb_context *tdb, TDB_DATA key);
int tdb_chainunlock_read(struct tdb_context *tdb, TDB_DATA key);
int tdb_chainlock_mark(struct tdb_context *tdb, TDB_DATA key);
int tdb_chainlock_unmark(struct tdb_context *tdb, TDB_DATA key);
void tdb_setalarm_sigptr(struct tdb_context *tdb, volatile sig_atomic_t *sigptr);
/* wipe and repack */
int tdb_wipe_all(struct tdb_context *tdb);
int tdb_repack(struct tdb_context *tdb);
/* Debug functions. Not used in production. */
void tdb_dump_all(struct tdb_context *tdb);
int tdb_printfreelist(struct tdb_context *tdb);
int tdb_validate_freelist(struct tdb_context *tdb, int *pnum_entries);
int tdb_freelist_size(struct tdb_context *tdb);
char *tdb_summary(struct tdb_context *tdb);
extern TDB_DATA tdb_null;
#ifdef __cplusplus
}
#endif
#endif /* tdb.h */