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76 строки
3.2 KiB
Groff
76 строки
3.2 KiB
Groff
.\" **************************************************************************
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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) 1998 - 2021, 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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.\" **************************************************************************
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.\"
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.TH CURLMOPT_MAX_HOST_CONNECTIONS 3 "November 26, 2021" "libcurl 7.83.1" "curl_multi_setopt options"
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.SH NAME
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CURLMOPT_MAX_HOST_CONNECTIONS \- max number of connections to a single host
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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_HOST_CONNECTIONS,
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long max);
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.fi
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.SH DESCRIPTION
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Pass a long to indicate \fBmax\fP. The set number will be used as the maximum
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amount of simultaneously open connections to a single host (a host being the
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same as a host name + port number pair). For each new session to a host,
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libcurl will open a new connection up to the limit set by
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\fICURLMOPT_MAX_HOST_CONNECTIONS(3)\fP. When the limit is reached, the
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sessions will be pending until a connection becomes available. If
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\fICURLMOPT_PIPELINING(3)\fP is enabled, libcurl will try to pipeline if the
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host is capable of it.
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The default \fBmax\fP value is 0, unlimited. However, for backwards
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compatibility, setting it to 0 when \fICURLMOPT_PIPELINING(3)\fP is 1 will not
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be treated as unlimited. Instead it will open only 1 connection and try to
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pipeline on it.
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This set limit is also used for proxy connections, and then the proxy is
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considered to be the host for which this limit counts.
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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 will be queued up waiting for their chance. When
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that happens, the \fICURLOPT_TIMEOUT_MS(3)\fP timeout will be counted
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inclusive of the waiting time, meaning that if you set a too narrow timeout in
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such a case the 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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0
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.SH PROTOCOLS
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HTTP(S)
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.SH EXAMPLE
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.nf
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CURLM *m = curl_multi_init();
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/* do no more than 2 connections per host */
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curl_multi_setopt(m, CURLMOPT_MAX_HOST_CONNECTIONS, 2L);
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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), " CURLMOPT_MAX_TOTAL_CONNECTIONS "(3), "
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