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 12--- 13 14# NAME 15 16CURLMOPT_MAX_TOTAL_CONNECTIONS - max simultaneously open connections 17 18# SYNOPSIS 19 20~~~c 21#include <curl/curl.h> 22 23CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_MAX_TOTAL_CONNECTIONS, 24 long amount); 25~~~ 26 27# DESCRIPTION 28 29Pass a long for the **amount**. The set number is used as the maximum number 30of simultaneously open connections in total using this multi handle. For each 31new session, libcurl might open a new connection up to the limit set by 32CURLMOPT_MAX_TOTAL_CONNECTIONS(3). When the limit is reached, new 33sessions are held pending until there are available connections. If 34CURLMOPT_PIPELINING(3) is enabled, libcurl can try multiplexing if the 35host is capable of it. 36 37When more transfers are added to the multi handle than what can be performed 38due to the set limit, they get queued up waiting for their chance. When that 39happens, the CURLOPT_TIMEOUT_MS(3) timeout is counted inclusive of the 40waiting time, meaning that if you set a too narrow timeout in such a case the 41transfer might never even start before it times out. 42 43Even in the queued up situation, the CURLOPT_CONNECTTIMEOUT_MS(3) 44timeout is however treated as a per-connect timeout. 45 46# DEFAULT 47 48The default value is 0, which means that there is no limit. It is then simply 49controlled by the number of easy handles added. 50 51# EXAMPLE 52 53~~~c 54int main(void) 55{ 56 CURLM *m = curl_multi_init(); 57 /* never do more than 15 connections */ 58 curl_multi_setopt(m, CURLMOPT_MAX_TOTAL_CONNECTIONS, 15L); 59} 60~~~ 61 62# AVAILABILITY 63 64Added in 7.30.0 65 66# RETURN VALUE 67 68Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not. 69