70 lines
2.8 KiB
Groff
70 lines
2.8 KiB
Groff
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLMOPT_MAX_TOTAL_CONNECTIONS 3 "4 Nov 2014" libcurl libcurl
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.SH NAME
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CURLMOPT_MAX_TOTAL_CONNECTIONS \- max simultaneously open connections
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_MAX_TOTAL_CONNECTIONS,
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long amount);
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.fi
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.SH DESCRIPTION
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Pass a long for the \fBamount\fP. The set number is used as the maximum number
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of simultaneously open connections in total using this multi handle. For each
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new session, libcurl might open a new connection up to the limit set by
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\fICURLMOPT_MAX_TOTAL_CONNECTIONS(3)\fP. When the limit is reached, new
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sessions are held pending until there are available connections. If
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\fICURLMOPT_PIPELINING(3)\fP is enabled, libcurl can try multiplexing if the
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host is capable of it.
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When more transfers are added to the multi handle than what can be performed
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due to the set limit, they get queued up waiting for their chance. When that
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happens, the \fICURLOPT_TIMEOUT_MS(3)\fP timeout is counted inclusive of the
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waiting time, meaning that if you set a too narrow timeout in such a case the
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transfer might never even start before it times out.
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Even in the queued up situation, the \fICURLOPT_CONNECTTIMEOUT_MS(3)\fP
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timeout is however treated as a per-connect timeout.
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.SH DEFAULT
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The default value is 0, which means that there is no limit. It is then simply
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controlled by the number of easy handles added.
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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.nf
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CURLM *m = curl_multi_init();
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/* never do more than 15 connections */
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curl_multi_setopt(m, CURLMOPT_MAX_TOTAL_CONNECTIONS, 15L);
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.fi
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.SH AVAILABILITY
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Added in 7.30.0
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.SH RETURN VALUE
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Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLMOPT_MAXCONNECTS (3),
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.BR CURLMOPT_MAX_HOST_CONNECTIONS (3)
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