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.\" generated by cd2nroff 0.1 from CURLOPT_LOCALPORT.md
.TH CURLOPT_LOCALPORT 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_LOCALPORT \- local port number to use for socket
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOCALPORT, long port);
.fi
.SH DESCRIPTION
Pass a long. This sets the local port number of the socket used for the
connection. This can be used in combination with \fICURLOPT_INTERFACE(3)\fP
and you are recommended to use \fICURLOPT_LOCALPORTRANGE(3)\fP as well when
this option is set. Valid port numbers are 1 \- 65535.
.SH DEFAULT
0, disabled \- use whatever the system thinks is fine
.SH PROTOCOLS
This functionality affects all supported protocols
.SH EXAMPLE
.nf
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
curl_easy_setopt(curl, CURLOPT_LOCALPORT, 49152L);
/* and try 20 more ports following that */
curl_easy_setopt(curl, CURLOPT_LOCALPORTRANGE, 20L);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
.fi
.SH AVAILABILITY
Added in curl 7.15.2
.SH RETURN VALUE
\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLINFO_LOCAL_PORT (3),
.BR CURLOPT_INTERFACE (3),
.BR CURLOPT_LOCALPORTRANGE (3)