Inserts a new entry into a hash table. The entry structure is defined
by the user, and should contain the macro 'RBHASH_HEADER'. See rbhash(3)
for information on how to create a compatible RBHashEntry structure.
This function sets key as the key for entry; the equivalent of
calling rbhash_entry_setkey(3) . The key is stored using an RBuf *
pointer within the RBHASH_HEADER; no copy of the RBuf itself is made.
RETURN VALUE
This function doesn't reutrn a value.
DUPLICATE ENTRIES
If an entry is inserted into the hash table with a key of an entry that
already exists in the hash table, they will both be added and no error
condition will exist. Any calls thereafter to rbhash_lookup(3) will
return the first entry inserted with that key.
If you do not wish to have multiple entries with the same key, you must
do a rbhash_lookup(3) prior to inserting the new entry.
