CURLINFO_PRIMARY_PORT(3) Library Functions Manual CURLINFO_PRIMARY_PORT(3)
NAME
CURLINFO_PRIMARY_PORT - last destination port number
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PRIMARY_PORT, long *portp);
DESCRIPTION
Pass a pointer to a long to receive the destination port of the most
recent connection done with this curl handle.
This is the destination port of the actual TCP or UDP connection
libcurl used. If a proxy was used for the most recent transfer, this
is the port number of the proxy, if no proxy was used it is the port
number of the most recently accessed URL.
If the connection was done using QUIC, the port number is a UDP port
number.
If no connection was established or if the protocol does not use ports,
-1 is returned.
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode result;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
result = curl_easy_perform(curl);
if(result == CURLE_OK) {
long port;
result = curl_easy_getinfo(curl, CURLINFO_PRIMARY_PORT, &port);
if(result == CURLE_OK)
printf("Connected to remote port: %ld\n", port);
}
curl_easy_cleanup(curl);
}
}
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_PORT(3), CURLINFO_PRIMARY_IP(3), curl_easy_getinfo(3),
curl_easy_setopt(3)
libcurl 2026-03-23 CURLINFO_PRIMARY_PORT(3)
curl 8.19.0 - Generated Thu Mar 26 07:27:45 CDT 2026