CURLMOPT_NETWORK_CHANGED(3) Library Functions Manual
NAME
CURLMOPT_NETWORK_CHANGED - signal network changed
SYNOPSIS
#include <curl/curl.h>
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_NETWORK_CHANGED,
long value);
DESCRIPTION
Pass a long with a bitmask to tell libcurl how the multi handle should
react. The following values in the mask are defined. All bits not
mentioned are reserved for future extensions.
This option can be set at any time and repeatedly. Each call only
affects the currently cached connections and DNS information. Any
connection created or DNS information added afterwards is cached the
usual way again. Phrasing it another way: the option is not persisted
but setting it serves as a "trigger" to clear the caches.
The call affects only the connection and DNS cache of the multi handle
itself and not the ones owned by SHARE handles.
CURLMNWC_CLEAR_ALL
Clear everything. (Added in 8.20.0)
CURLMNWC_CLEAR_CONNS
No longer reuse any existing connection in the multi handle's
connection cache. This closes all connections that are not in
use. Ongoing transfers continue on the connections they operate
on.
CURLMNWC_CLEAR_DNS
Clear the multi handle's DNS cache. Ongoing transfers keep using
their already resolved addresses, but future name resolutions
are performed again.
DEFAULT
0, which has no effect.
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
int main(void)
{
CURLM *m = curl_multi_init();
/* do transfers on the multi handle */
/* do not reuse existing connections */
curl_multi_setopt(m, CURLMOPT_NETWORK_CHANGED, CURLMNWC_CLEAR_CONNS);
}
AVAILABILITY
Added in curl 8.16.0
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
CURLOPT_FORBID_REUSE(3), CURLOPT_FRESH_CONNECT(3)
libcurl 2026-06-09 CURLMOPT_NETWORK_CHANGED(3)
curl 8.20.0 - Generated Tue Jun 9 13:16:53 CDT 2026