1dbh_erase(3)           DBHashTables Programmers' Manual           dbh_erase(3)
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NAME

8       dbh_erase,  dbh_unerase,  dbh_prune.3,  dbh_unprune.3  -  erase/unerase
9       records or prune/unprune entire branches
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SYNOPSIS

12       #include <dbh.h>
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14       int dbh_erase (DBHashTable *dbh);
15       int dbh_unerase (DBHashTable *dbh);
16       int dbh_prune (DBHashTable *dbh, unsigned char *key, unsigned char sub‐
17       tree_length);
18       int  dbh_unprune  (DBHashTable  *dbh, unsigned char *key, unsigned char
19       subtree_length);
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DESCRIPTION

23       Mark the record currently loaded into memory as erased. If no record is
24       currently loaded, behaviour is undefined.
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26       This  is the opposite of dbh_erase (). Mark the record currently loaded
27       into memory as unerased. If no record is currently loaded, behaviour is
28       undefined.
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31       Erases  a  whole  subtree from the record currently loaded into memory.
32       Records are not really removed fisically, but rather marked  erased  so
33       they may be recovered (if not overwritten later on). Records are perma‐
34       nently removed after DBHashTable is reconstructed with  dbh_regen_sweep
35       () or dbh_regen_fanout ().
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37       Does  the opposite of dbh_prune (), marking entire subtree as unerased.
38       May fail to work if records have been overwritten since  the  dbh_prune
39       () instruction was issued.
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41       In  the dbh_prune and dbh_unprune routines, key is the key of top level
42       record of subtree to erase and subtree_length is the number of branches
43       to erase.
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RETURN VALUE

47       0 on error, 1 otherwise.
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SEE ALSO

50       dbh (0), dbh_find (3), dbh_load (3), dbh_sweep (3), dbh_regen_sweep (3)
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Author

53       Edscott Wilson Garcia <edscott@xfce.org>
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57DBHashTables                          DBH                         dbh_erase(3)
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