.\" generated by cd2nroff 0.1 from CURLOPT_LOCALPORT.md
.TH CURLOPT_LOCALPORT 3 "2024-11-18" 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
Returns CURLE_OK
.SH SEE ALSO
.BR CURLINFO_LOCAL_PORT (3),
.BR CURLOPT_INTERFACE (3),
.BR CURLOPT_LOCALPORTRANGE (3)