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tdb(3) [centos man page]

TDB(3)                                                       Linux Programmer's Manual                                                      TDB(3)

tdb - trivial database SYNOPSIS
A database similar to gdbm which allows multiple simultaneous writers. DESCRIPTION
This is a simple database API. It was inspired by the realisation that in Samba we have several ad-hoc bits of code that essentially imple- ment small databases for sharing structures between parts of Samba. As I was about to add another I realised that a generic database module was called for to replace all the ad-hoc bits. I based the interface on gdbm. I couldn't use gdbm as we need to be able to have multiple writers to the databases at one time. AUTHORS
Software: Andrew Tridgell <> and Luke Kenneth Casson Leighton Man page: Ben Woodard <> SEE ALSO
gdbm(3), tdb_open(3), tdb_close(3), tdb_delete(3), tdb_error(3), tdb_exists(3), tdb_fetch(3), tdb_firstkey(3), tdb_store(3), tdb_tra- verse(3), tdb_lockall(3), tdb_lockkeys(3), tdb_chainlock(3) Samba Aug 16, 2000 TDB(3)

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TDB_FIRSTKEY(3) 					     Linux Programmer's Manual						   TDB_FIRSTKEY(3)

tdb_firstkey - return the key of the first record in a tdb database tdb_nextkey - return the key of next record in the tdb database SYNOPSIS
#include <tdb.h> TDB_DATA tdb_firstkey(TDB_CONTEXT *tdb); TDB_DATA tdb_nextkey(TDB_CONTEXT *tdb, TDB_DATA prev_key); DESCRIPTION
tdb_firstkey fetches the key of the first entry in the tdb database. tdb_nextkey fetches the key of the entry immediately after prev_key in the database. The TDB_DATA structure returned by both these functions is defined as: typedef struct { char *dptr; size_t dsize; } TDB_DATA; The order in which this traverses the database is its own internal hash order. Do not expect the keys to be in any recognizably sorted order. These functions are reliable even if other writers are accessing the database (or you are replacing or deleting elements as you traverse), except in the case of nested tdb_firstkey or tdb_nextkey calls. For example, the following outer traversal may fail to traverse all the elements, or may even traverse elements twice if other processes are manipulating the database: TDB_DATA i, j; for (i = tdb_firstkey(tdb); i.dptr; i = tdb_nextkey(tdb, i)) { for (j = tdb_firstkey(tdb); j.dptr; j = tdb_nextkey(tdb, j)) { ... } } If such behaviour is desired, use tdb_traverse instead. RETURN VALUE
If the call succeeds, then a TDB_DATA structure is returned with the dptr structure filled in. If the call fails or you have reached the end of the database then dptr will be set to NULL. NOTE: The caller is responsible for freeing the data pointed to by dptr AUTHORS
Software: Andrew Tridgell <> and Luke Kenneth Casson Leighton Man page: Ben Woodard <> SEE ALSO
gdbm(3), tdb(3) Samba Aug 16, 2000 TDB_FIRSTKEY(3)
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