curl_multi_init - Man Page

#include <curl/curl.h>

CURLM *curl_multi_init();

This function returns a pointer to a CURLM handle to be used as input to all the other multi-functions, sometimes referred to as a multi handle in some places in the documentation. This init call MUST have a corresponding call to curl_multi_cleanup(3) when the operation is complete.

This functionality affects all supported protocols

int main(void)
{
  /* init a multi stack */
  CURLM *multi = curl_multi_init();
  CURL *curl = curl_easy_init();
  CURL *curl2 = curl_easy_init();

  /* add individual transfers */
  curl_multi_add_handle(multi, curl);
  curl_multi_add_handle(multi, curl2);
}

Added in curl 7.9.6

If this function returns NULL, something went wrong and you cannot use the other curl functions.

curl_easy_init(3), curl_global_init(3), curl_multi_add_handle(3), curl_multi_cleanup(3), curl_multi_get_handles(3)

curl_easy_init(3), curl_multi_add_handle(3), curl_multi_cleanup(3), curl_multi_fdset(3), curl_multi_get_handles(3), curl_multi_info_read(3), curl_multi_perform(3), curl_multi_remove_handle(3), curl_multi_setopt(3), curl_multi_socket(3), curl_multi_socket_action(3), curl_multi_socket_all(3), libcurl-multi(3), libcurl-tutorial(3).