70 lines
2.4 KiB
Groff
70 lines
2.4 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 CURLOPT_LOCALPORTRANGE 3 "19 Jun 2014" libcurl libcurl
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.SH NAME
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CURLOPT_LOCALPORTRANGE \- number of additional local ports to try
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOCALPORTRANGE,
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long range);
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.fi
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.SH DESCRIPTION
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Pass a long. The \fIrange\fP argument is the number of attempts libcurl makes
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to find a working local port number. It starts with the given
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\fICURLOPT_LOCALPORT(3)\fP and adds one to the number for each retry. Setting
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this option to 1 or below makes libcurl only do one try for the exact port
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number. Port numbers by nature are scarce resources that are busy at times so
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setting this value to something too low might cause unnecessary connection
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setup failures.
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.SH DEFAULT
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1
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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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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
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curl_easy_setopt(curl, CURLOPT_LOCALPORT, 49152L);
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/* and try 20 more ports following that */
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curl_easy_setopt(curl, CURLOPT_LOCALPORTRANGE, 20L);
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Added in 7.15.2
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_INTERFACE (3),
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.BR CURLOPT_LOCALPORT (3)
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