TDB_FETCH(3) Linux Programmer's Manual TDB_FETCH(3)NAME
tdb_fetch - fetch a record from a tdb database
SYNOPSIS
#include <tdb.h>
TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key);
DESCRIPTION
Fetch the record from the tdb database whose key matches key , a lump of data that is used as the index into the database.
The TDB_DATA structure used for both the key and the return value is defined as:
typedef struct {
char *dptr;
size_t dsize;
} TDB_DATA;
RETURN VALUE
If the call succeeds, then a TDB_DATA structure is returned with the dptr structure filled in. If the call fails then dptr will be set to
NULL.
NOTE: The caller is responsible for freeing the data pointed to by dptr.
AUTHORS
Software: Andrew Tridgell <tridge@linuxcare.com> and Luke Kenneth Casson Leighton Man page: Ben Woodard <ben@valinux.com>
SEE ALSO gdbm(3), tdb(3)Samba Aug 16, 2000 TDB_FETCH(3)
Check Out this Related Man Page
TDB_TRAVERSE(3) Linux Programmer's Manual TDB_TRAVERSE(3)NAME
tdb_traverse - visit every element in a tdb database
SYNOPSIS
#include <tdb.h>
int tdb_traverse(TDB_CONTEXT *tdb,
int (*fn)(TDB_CONTEXT *,TDB_DATA,TDB_DATA,void *),
void *state);
DESCRIPTION
tdb_traverse is the only sure way to visit all the items within a given database, tdb Because this function has intimate knowledge of the
internals of the database, it is able to cope with writers touching the database at the same time it is trying to traverse it.
If fn is supplied it will be called with the state parameter for each element in the database, as the forth argument. The First argument is
the database tdb the second is the key and the third is the data. If this function call returns anything but 0, the traversal will stop.
Unlike in tdb_fetch() the programmer is not required to free either the pointer from either the key or data parameters that are passed into
the function. The fn function should have the prototype:
int (*tdb_traverse_func)(TDB_CONTEXT *, TDB_DATA, TDB_DATA, void *);
Calling tdb_traverse with a NULL fn parameter is the appropriate way to count the number of elements in the database.
RETURN VALUE
The return value is the number of elements traversed or -1 if there was an error.
AUTHORS
Software: Andrew Tridgell <tridge@linuxcare.com> and Luke Kenneth Casson Leighton Man page: Ben Woodard <ben@valinux.com>
SEE ALSO gdbm(3), tdb(3)Samba Aug 16, 2000 TDB_TRAVERSE(3)
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