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curl_multi_add_handle(3) libcurl Manual curl_multi_add_handle(3)
curl_multi_add_handle - add an easy handle to a multi session
CURLMcode curl_multi_add_handle(CURLM *multi_handle, CURL *easy_handle);
Adds a standard easy handle to the multi stack. This function call will
make this multi_handle control the specified easy_handle.
While an easy handle is added to a multi stack, you cannot and you must
not use curl_easy_perform(3) on that handle. After having removed the
easy handle from the multi stack again, it is perfectly fine to use it
with the easy interface again.
If the easy handle is not set to use a shared (CURLOPT_SHARE(3)) or
global DNS cache (CURLOPT_DNS_USE_GLOBAL_CACHE(3)), it will be made to
use the DNS cache that is shared between all easy handles within the
multi handle when curl_multi_add_handle(3) is called.
When an easy interface is added to a multi handle, it will use a shared
connection cache owned by the multi handle. Removing and adding new
easy handles will not affect the pool of connections or the ability to
do connection re-use.
If you have CURLMOPT_TIMERFUNCTION(3) set in the multi handle (and you
really should if you are working event-based with
curl_multi_socket_action(3) and friends), that callback will be called
from within this function to ask for an updated timer so that your main
event loop will get the activity on this handle to get started.
The easy handle will remain added to the multi handle until you remove
it again with curl_multi_remove_handle(3) - even when a transfer with
that specific easy handle is completed.
You should remove the easy handle from the multi stack before you
terminate first the easy handle and then the multi handle:
1 - curl_multi_remove_handle(3)
2 - curl_easy_cleanup(3)
3 - curl_multi_cleanup(3)
/* init a multi stack */
multi_handle = curl_multi_init();
/* add individual transfers */
Added in 7.9.6
CURLMcode type, general libcurl multi interface error code.
libcurl 7.86.0 September 20, 2022 curl_multi_add_handle(3)