CURLMOPT_MAX_TOTAL_CONNECTIONS - max simultaneously open connections
CURLMcode curl_multi_setopt(CURLM *handle,
CURLMOPT_MAX_TOTAL_CONNECTIONS, long amount);
Pass a long for the amount. The set number will be used as the maximum
number of simultaneously open connections in total using this multi handle.
For each new session, libcurl will open a new connection up to the limit set
by CURLMOPT_MAX_TOTAL_CONNECTIONS(3). When the limit is reached, the
sessions will be pending until there are available connections. If
CURLMOPT_PIPELINING(3) is enabled, libcurl will try to pipeline or use
multiplexing if the host is capable of it.
The default value is 0, which means that there is no limit. It is then simply
controlled by the number of easy handles added.
CURLM *m = curl_multi_init();
/* never do more than 15 connections */
curl_multi_setopt(m, CURLMOPT_MAX_TOTAL_CONNECTIONS, 15L);
Added in 7.30.0
Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.