89 lines
2.3 KiB
Markdown
89 lines
2.3 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: curl_multi_add_handle
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Section: 3
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Source: libcurl
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See-also:
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- curl_multi_cleanup (3)
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- curl_multi_get_handles (3)
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- curl_multi_init (3)
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- curl_multi_setopt (3)
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- curl_multi_socket_action (3)
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---
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# NAME
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curl_multi_add_handle - add an easy handle to a multi session
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLMcode curl_multi_add_handle(CURLM *multi_handle, CURL *easy_handle);
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~~~
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# DESCRIPTION
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Adds the *easy handle* to the *multi_handle*.
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While an easy handle is added to a multi stack, you cannot and you must not
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use curl_easy_perform(3) on that handle. After having removed the easy
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handle from the multi stack again, it is perfectly fine to use it with the
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easy interface again.
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If the easy handle is not set to use a shared (CURLOPT_SHARE(3)) cache,
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it is made to use a DNS cache that is shared between all easy handles within
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the multi handle when curl_multi_add_handle(3) is called.
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When an easy interface is added to a multi handle, it is set to use a shared
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connection cache owned by the multi handle. Removing and adding new easy
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handles does not affect the pool of connections or the ability to do
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connection reuse.
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If you have CURLMOPT_TIMERFUNCTION(3) set in the multi handle (as you
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should if you are working event-based with curl_multi_socket_action(3)
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and friends), that callback is called from within this function to ask for an
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updated timer so that your main event loop gets the activity on this handle to
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get started.
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The easy handle remains added to the multi handle until you remove it again
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with curl_multi_remove_handle(3) - even when a transfer with that
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specific easy handle is completed.
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You should remove the easy handle from the multi stack before you terminate
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first the easy handle and then the multi handle:
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1 - curl_multi_remove_handle(3)
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2 - curl_easy_cleanup(3)
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3 - curl_multi_cleanup(3)
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# EXAMPLE
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~~~c
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int main(void)
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{
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/* init a multi stack */
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CURLM *multi = curl_multi_init();
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/* create two easy handles */
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CURL *http_handle = curl_easy_init();
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CURL *http_handle2 = curl_easy_init();
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/* add individual transfers */
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curl_multi_add_handle(multi, http_handle);
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curl_multi_add_handle(multi, http_handle2);
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}
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~~~
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# AVAILABILITY
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Added in 7.9.6
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# RETURN VALUE
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CURLMcode type, general libcurl multi interface error code.
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