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curl_multi_add_handle(3) libcurl curl_multi_add_handle(3)
NAME
curl_multi_add_handle - add an easy handle to a multi session
SYNOPSIS
#include <curl/curl.h>
CURLMcode curl_multi_add_handle(CURLM *multi_handle, CURL *easy_handle);
DESCRIPTION
Adds the easy handle to the multi_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)) cache,
it is made to use a 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 is set to use a
shared connection cache owned by the multi handle. Removing and adding
new easy handles does not affect the pool of connections or the ability
to do connection reuse.
If you have CURLMOPT_TIMERFUNCTION(3) set in the multi handle (as you
should if you are working event-based with curl_multi_socket_action(3)
and friends), that callback is called from within this function to ask
for an updated timer so that your main event loop gets the activity on
this handle to get started.
The easy handle remains 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 ter-
minate 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)
EXAMPLE
/* init a multi stack */
multi_handle = curl_multi_init();
/* add individual transfers */
curl_multi_add_handle(multi_handle, http_handle);
curl_multi_add_handle(multi_handle, http_handle2);
AVAILABILITY
Added in 7.9.6
RETURN VALUE
CURLMcode type, general libcurl multi interface error code.
SEE ALSO
curl_multi_cleanup(3), curl_multi_get_handles(3), curl_multi_init(3),
curl_multi_setopt(3), curl_multi_socket_action(3)
libcurl 8.4.0 September 26, 2023 curl_multi_add_handle(3)
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