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.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms
.\" * are also available at https://curl.se/docs/copyright.html.
.\" *
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
.\" * copies of the Software, and permit persons to whom the Software is
.\" * furnished to do so, under the terms of the COPYING file.
.\" *
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
.\" * KIND, either express or implied.
.\" *
.\" * SPDX-License-Identifier: curl
.\" *
.\" **************************************************************************
.TH curl_multi_add_handle 3 "4 March 2002" "libcurl" "libcurl"
.SH NAME
curl_multi_add_handle - add an easy handle to a multi session
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLMcode curl_multi_add_handle(CURLM *multi_handle, CURL *easy_handle);
.fi
.SH DESCRIPTION
Adds the \fIeasy handle\fP to the \fImulti_handle\fP.
While an easy handle is added to a multi stack, you cannot and you must not
use \fIcurl_easy_perform(3)\fP 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 (\fICURLOPT_SHARE(3)\fP) cache,
it is made to use a DNS cache that is shared between all easy handles within
the multi handle when \fIcurl_multi_add_handle(3)\fP 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 \fICURLMOPT_TIMERFUNCTION(3)\fP set in the multi handle (as you
should if you are working event-based with \fIcurl_multi_socket_action(3)\fP
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 \fIcurl_multi_remove_handle(3)\fP - 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 - \fIcurl_multi_remove_handle(3)\fP
2 - \fIcurl_easy_cleanup(3)\fP
3 - \fIcurl_multi_cleanup(3)\fP
.SH EXAMPLE
.nf
/* 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);
.fi
.SH AVAILABILITY
Added in 7.9.6
.SH RETURN VALUE
CURLMcode type, general libcurl multi interface error code.
.SH "SEE ALSO"
.BR curl_multi_cleanup (3),
.BR curl_multi_get_handles (3),
.BR curl_multi_init (3),
.BR curl_multi_setopt (3),
.BR curl_multi_socket_action (3)
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