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started a section about chains, documented empty_data_ok for findnode.

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David Lawrence 2000-01-06 14:47:37 +00:00
parent e2125b01c2
commit 29e23c0b3e
1 changed files with 23 additions and 3 deletions
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doc/design/red-black
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@ -126,6 +126,26 @@ rc.vix.com, but not the full name.
No locking is done within the RBT library. @@@
CHAINS
@@@
When a partial match is made, level_matches is set while the chain
points to the partial match node that was found. Then the chain is
adjusted to point to the DNSSEC predecessor node, which might not even
be under the same top level domain as the name that was searched for.
For example, consider a database that had only the names vix.com and
isc.org. A search for uu.net would leave the chain pointed to
vix.com, the DNSSEC predecessor. Though this might first appear to
cause level_matches to be bogus because the chain has been unwound and
sent down another path, note that the partial match node will always
be in the chain of the predecessor, too --- and often the partial
match node will be the predecessor itself. In the vix.com/isc.org
example, the search for uu.net finds a partial match at ".", which is
of course also in the path to the vix.com predecessor. A search for
www.isc.org would find that isc.org is both the partial match and the
predecessor.
EXTERNAL PROGRAMMATIC DETAILS
This section details the functions used to interact with the BIND9
@ -179,7 +199,6 @@ data for that name is returned in the data parameter. If no data is
found for the name or a superdomain, *data will remain NULL.
INTERNAL PROGRAMMATIC DETAILS
This section is mainly relevant to the RBT DB implementation. It is
@ -193,8 +212,8 @@ particularly care whether a node has an associated data pointer or
not, whereas the *name functions do. The one exception to this is
that when a PARTIALMATCH is returned for a search, the indicated node
is the deepest match that has data, rather than just the deepest
match. This inconsistency could be addressed by adding another
parameter to dns_rbt_findnode.
match. Even that behavior is selectable, however, using the boolean
empty_data_ok argument to dns_rbt_findnode.
Each node in the tree of trees is represented by the following structure:
@ -226,3 +245,4 @@ Each node in the tree of trees is represented by the following structure:
unsigned int references:DNS_RBT_REFLENGTH;
} dns_rbtnode_t;
@@@