CURLMOPT_MAX_TOTAL_CONNECTIONS(3) Library Functions Manual
NAME
CURLMOPT_MAX_TOTAL_CONNECTIONS - max simultaneously open connections
SYNOPSIS
#include <curl/curl.h>
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_MAX_TOTAL_CONNECTIONS,
long amount);
DESCRIPTION
Pass a long for the amount. The set number is used as the maximum
number of simultaneously open connections in total using this multi
handle. For each new session, libcurl might open a new connection up to
the limit set by CURLMOPT_MAX_TOTAL_CONNECTIONS(3). When the limit is
reached, new sessions are held pending until there are available
connections. If CURLMOPT_PIPELINING(3) is enabled, libcurl can try
multiplexing if the host is capable of it.
When more transfers are added to the multi handle than what can be
performed due to the set limit, they get queued up waiting for their
chance. When that happens, the CURLOPT_TIMEOUT_MS(3) timeout is counted
inclusive of the waiting time, meaning that if you set a too narrow
timeout in such a case the transfer might never even start before it
times out.
Even in the queued up situation, the CURLOPT_CONNECTTIMEOUT_MS(3)
timeout is however treated as a per-connect timeout.
DEFAULT
0, which means that there is no limit. It is then simply controlled by
the number of easy handles added.
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
int main(void)
{
CURLM *m = curl_multi_init();
/* never do more than 15 connections */
curl_multi_setopt(m, CURLMOPT_MAX_TOTAL_CONNECTIONS, 15L);
}
AVAILABILITY
Added in curl 7.30.0
RETURN VALUE
Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION
if not.
SEE ALSO
CURLMOPT_MAXCONNECTS(3), CURLMOPT_MAX_HOST_CONNECTIONS(3)
libcurl 2024-08-05 CURLMOPT_MAX_TOTAL_CONNECTIONS(3)
curl 8.9.1 - Generated Thu Aug 8 11:15:17 CDT 2024