1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLMOPT_MAX_TOTAL_CONNECTIONS 5Section: 3 6Source: libcurl 7See-also: 8 - CURLMOPT_MAXCONNECTS (3) 9 - CURLMOPT_MAX_HOST_CONNECTIONS (3) 10Protocol: 11 - All 12Added-in: 7.30.0 13--- 14 15# NAME 16 17CURLMOPT_MAX_TOTAL_CONNECTIONS - max simultaneously open connections 18 19# SYNOPSIS 20 21~~~c 22#include <curl/curl.h> 23 24CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_MAX_TOTAL_CONNECTIONS, 25 long amount); 26~~~ 27 28# DESCRIPTION 29 30Pass a long for the **amount**. The set number is used as the maximum number 31of simultaneously open connections in total using this multi handle. For each 32new session, libcurl might open a new connection up to the limit set by 33CURLMOPT_MAX_TOTAL_CONNECTIONS(3). When the limit is reached, new 34sessions are held pending until there are available connections. If 35CURLMOPT_PIPELINING(3) is enabled, libcurl can try multiplexing if the 36host is capable of it. 37 38When more transfers are added to the multi handle than what can be performed 39due to the set limit, they get queued up waiting for their chance. When that 40happens, the CURLOPT_TIMEOUT_MS(3) timeout is counted inclusive of the 41waiting time, meaning that if you set a too narrow timeout in such a case the 42transfer might never even start before it times out. 43 44Even in the queued up situation, the CURLOPT_CONNECTTIMEOUT_MS(3) 45timeout is however treated as a per-connect timeout. 46 47# DEFAULT 48 490, which means that there is no limit. It is then simply controlled by the 50number of easy handles added. 51 52# %PROTOCOLS% 53 54# EXAMPLE 55 56~~~c 57int main(void) 58{ 59 CURLM *m = curl_multi_init(); 60 /* never do more than 15 connections */ 61 curl_multi_setopt(m, CURLMOPT_MAX_TOTAL_CONNECTIONS, 15L); 62} 63~~~ 64 65# %AVAILABILITY% 66 67# RETURN VALUE 68 69Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not. 70