CURLINFO_LOCAL_PORT(3) Library Functions Manual CURLINFO_LOCAL_PORT(3)
NAME
CURLINFO_LOCAL_PORT - get the latest local port number
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_LOCAL_PORT, long *portp);
DESCRIPTION
Pass a pointer to a long to receive the local port number of the most
recent connection done with this curl handle.
If the connection was done using QUIC, the port number is a UDP port
number, otherwise it is a TCP port number.
PROTOCOLS
This functionality affects quic and tcp
EXAMPLE
int main(void)
{
CURL *curl;
CURLcode res;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
res = curl_easy_perform(curl);
if(CURLE_OK == res) {
long port;
res = curl_easy_getinfo(curl, CURLINFO_LOCAL_PORT, &port);
if(CURLE_OK == res) {
printf("We used local port: %ld\n", port);
}
}
curl_easy_cleanup(curl);
}
return 0;
}
AVAILABILITY
Added in curl 7.21.0
RETURN VALUE
curl_easy_getinfo(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLINFO_LOCAL_IP(3), CURLINFO_PRIMARY_PORT(3), curl_easy_getinfo(3),
curl_easy_setopt(3)
libcurl 2026-07-12 CURLINFO_LOCAL_PORT(3)
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