CURLMOPT_NETWORK_CHANGED

Section: C Library Functions (3)
Updated: 202-1-15
Index Return to Main Contents

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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 handleaqs 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 handleaqs 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)

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Index

NAME

SYNOPSIS

DESCRIPTION

DEFAULT

PROTOCOLS

EXAMPLE

AVAILABILITY

RETURN VALUE

SEE ALSO