curl_multi_cleanup - close down a multi session

Added in curl 7.9.6

This function is the opposite of curl_multi_init(3). Cleans up and removes a whole multi stack. It does not free or touch any individual easy handles in any way - they still need to be closed individually, using the usual curl_easy_cleanup(3) way. The order of cleaning up should be: 1 - curl_multi_remove_handle(3) before any easy handles are cleaned up 2 - curl_easy_cleanup(3) can now be called independently since the easy handle is no longer connected to the multi handle 3 - curl_multi_cleanup(3) should be called when all easy handles are removed When this function is called, remaining entries in the connection pool held by the multi handle are shut down, which might trigger calls to the CURLMOPT_SOCKETFUNCTION(3) callback. Passing in a NULL pointer in multi_handle makes this function return CURLM_BAD_HANDLE immediately with no other action. Any use of the multi_handle after this function has been called and have returned, is illegal.

int main(void) { CURLM *multi = curl_multi_init(); /* when the multi transfer is done ... */ /* remove all easy handles, then: */ curl_multi_cleanup(multi); }

curl_multi_cleanup - close down a multi session

This functionality affects all supported protocols

This function returns a CURLMcode indicating success or error. CURLM_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

curl_easy_cleanup(3), curl_easy_init(3), curl_multi_get_handles(3), curl_multi_init(3) libcurl 2025-06-16 curl_multi_cleanup(3)

#include <curl/curl.h> CURLMcode curl_multi_cleanup(CURLM *multi_handle);