NAME

SYNOPSIS

void
dnstable_merge_func(void *clos,
                    const uint8_t *key, size_t len_key,
                    const uint8_t *val0, size_t len_val0,
                    const uint8_t *val1, size_t len_val1,
                    uint8_t **merged_val, size_t *len_merged_val);

DESCRIPTION

There are four dnstable MTBL key-value entry types. dnstable_merge_func handles them in the following manner:

ENTRY_TYPE_RRSET_NAME_FWD and ENTRY_TYPE_RDATA_NAME_REV entries: In dnstable versions before 0.12.0, these have no associated value (that is, the values for these types is zero length). A zero-length byte array is provided as the merged value. As of version 0.12.0, the value is an RRtype union described in the dnstable-encoding(5) manual page.

ENTRY_TYPE_RRSET and ENTRY_TYPE_RDATA entries: These have an identical encoding format. These types encode a triplet of varint-encoded integers representing the time_first, time_last, and count value fields. A new triplet of varint-encoded integers is generated as the merged value as follows:

SEE ALSO