This is what the "callback" API would look like:
typedef struct bufferevent* (*bev_factory_cb)(void *arg);
/**
* Create and return a connection object that can be used for making
* HTTP requests. The connection object tries to resolve address and
* establish the connection when it is given an http request object.
* The specified factory function is called with the user-supplied
* argument to retrieve a new bufferevent whenever the underlying HTTP
* connection needs to be reestablished. This is what you want if, for
* example, you have a bufferevent that needs to perform some setup for
* new connections, such as an SSL bufferevent.
*
* @param base the event_base to use for handling the connection
* @param dnsbase the dns_base to use for resolving host names; if not
* specified host name resolution will block.
* @param cb a callback that returns a new bufferevent to use for
* connecting to the server; if NULL, behavior is the same as in
* calling evhttp_connection_base_bufferevent_new with a NULL
* bufferevent. The returned bufferevents will be freed when the
* underlying TCP connection closes. The returned bufferevents
* must have no fd set on them.
* @param arg the argument to supply to the callback
* @param address the address to which to connect
* @param port the port to connect to
* @return an evhttp_connection object that can be used for making
* requests
*/
struct evhttp_connection*
evhttp_connection_base_bufferevent_factory_new(
struct event_base *base, struct evdns_base *dnsbase,
bev_factory_cb cb, void * arg,
const char *address, unsigned short port);
***********************************************************************
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