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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 num- ber. 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 2026-06-11 CURLINFO_PRIMARY_PORT(3)
NAME | SYNOPSIS | DESCRIPTION | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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