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tdb_exists(3) [centos man page]

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

NAME
tdb_exists - check for the existence of a record in a tdb database SYNOPSIS
#include <tdb.h> int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key); DESCRIPTION
Test to see if a key exists. tdb is a pointer returned by tdb_open and key is a lump of data that is used as the index into the database. The TDB_DATA structure is defined as: typedef struct { char *dptr; size_t dsize; } TDB_DATA; RETURN VALUE
If the key is found, 1 is returned; otherwise 0 is returned. 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 17, 2000 TDB_EXISTS(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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