evdns: integrate deferred_response_callback into evdns_request

the allocation of the struct deferred_reply_callback can fail. If that
happens a program waiting for a callback never gets a callback. The
program would asume that it either gets an error or a callback when e.g.
calling evdns_base_resolve_ipv6.

I did an analysis of the evdns.c code and concluded that struct
evdns_request would live until the callback is executed. Based on that
conclusion I removed the struct deferred_reply_callback and moved the
neccessary fields for data which should be copied from struct request
into struct evdns_request.

The fields evdns_callback_type user_callback and void *user_pointer are
moved into struct evdns_request as it is a more natural place for them
to live than struct request.

0 files changed, 0 insertions, 0 deletions