CURLMOPT_MAXCONNECTS(3) Library Functions Manual CURLMOPT_MAXCONNECTS(3)
NAME
CURLMOPT_MAXCONNECTS - size of connection cache
SYNOPSIS
#include <curl/curl.h>
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_MAXCONNECTS, long max);
DESCRIPTION
Pass a long indicating the max, the maximum amount of connections that
libcurl may keep alive in its connection cache after use. By default
libcurl enlarges the size for each added easy handle to make it fit 4
times the number of added easy handles.
By setting this option, you prevent the cache size from growing beyond
the limit set by you.
When the cache is full, curl closes the oldest connection present in the
cache to prevent the number of connections from increasing.
This option is for the multi handle's use only, when using the easy in-
terface you should instead use the CURLOPT_MAXCONNECTS(3) option.
See CURLMOPT_MAX_TOTAL_CONNECTIONS(3) for limiting the number of active
connections.
Changing this value when there are transfers in progress is possible,
and the new value is then used the next time checks are performed. Low-
ering the value does not close down any active transfers, it simply does
not allow new ones to get made.
DEFAULT
See DESCRIPTION
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
int main(void)
{
CURLM *m = curl_multi_init();
/* only keep 10 connections in the cache */
curl_multi_setopt(m, CURLMOPT_MAXCONNECTS, 10L);
}
AVAILABILITY
Added in curl 7.16.3
RETURN VALUE
curl_multi_setopt(3) returns a CURLMcode indicating success or error.
CURLM_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLMOPT_MAX_HOST_CONNECTIONS(3), CURLOPT_MAXCONNECTS(3)
libcurl 2026-07-12 CURLMOPT_MAXCONNECTS(3)
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