47 lines
1.4 KiB
Groff
47 lines
1.4 KiB
Groff
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.\" generated by cd2nroff 0.1 from CURLOPT_LOCALPORT.md
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.TH CURLOPT_LOCALPORT 3 "2025-07-07" libcurl
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.SH NAME
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CURLOPT_LOCALPORT \- local port number to use for socket
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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_LOCALPORT, long port);
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.fi
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.SH DESCRIPTION
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Pass a long. This sets the local port number of the socket used for the
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connection. This can be used in combination with \fICURLOPT_INTERFACE(3)\fP
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and you are recommended to use \fICURLOPT_LOCALPORTRANGE(3)\fP as well when
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this option is set. Valid port numbers are 1 \- 65535.
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.SH DEFAULT
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0, disabled \- use whatever the system thinks is fine
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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 CURLINFO_LOCAL_PORT (3),
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.BR CURLOPT_INTERFACE (3),
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.BR CURLOPT_LOCALPORTRANGE (3)
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