Tribblix: manual page: CURLINFO

CURLINFO_ACTIVESOCKET(3) Introduction to Library Functions

NAME

CURLINFO_ACTIVESOCKET - get the active socket

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_ACTIVESOCKET,
curl_socket_t *socket);

DESCRIPTION

Pass a pointer to a curl_socket_t to receive the most recently active
socket used for the transfer connection by this curl session. If the
socket is no longer valid, CURL_SOCKET_BAD is returned. When you are
finished working with the socket, you must call curl_easy_cleanup(3)
as usual on the easy handle and let libcurl close the socket and
cleanup other resources associated with the handle. This option
returns the active socket only after the transfer is complete, and is
typically used in combination with CURLOPT_CONNECT_ONLY(3), which
skips the transfer phase.

CURLINFO_ACTIVESOCKET(3) was added as a replacement for
CURLINFO_LASTSOCKET(3) since that one is not working on all
platforms.

PROTOCOLS

This functionality affects all supported protocols

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_socket_t sockfd;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

/* Do not do the transfer - only connect to host */
curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);
res = curl_easy_perform(curl);
if(res != CURLE_OK) {
printf("Error: %s\n", curl_easy_strerror(res));
curl_easy_cleanup(curl);
return 1;
}

/* Extract the socket from the curl handle */
res = curl_easy_getinfo(curl, CURLINFO_ACTIVESOCKET, &sockfd);
if(!res && sockfd != CURL_SOCKET_BAD) {
/* operate on sockfd */
}

curl_easy_cleanup(curl);
}
}

AVAILABILITY

Added in curl 7.45.0

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).