50 lines
1.6 KiB
Groff
50 lines
1.6 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_LOCALPORTRANGE.md
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.TH CURLOPT_LOCALPORTRANGE 3 "2025-07-07" 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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This functionality affects all supported protocols
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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 curl 7.15.2
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.SH RETURN VALUE
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\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
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\fIlibcurl\-errors(3)\fP.
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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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