CURLINFO_ACTIVESOCKET(3) Library Functions Manual CURLINFO_ACTIVESOCKET(3)
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socket is no longer valid, CURL_SOCKET_BAD is returned.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).
SEE ALSO
CURLINFO_LASTSOCKET(3), CURLOPT_CONNECT_ONLY(3), curl_easy_getinfo(3),
curl_easy_setopt(3)
libcurl 2025-02-05 CURLINFO_ACTIVESOCKET(3)
curl 8.12.0 - Generated Wed Feb 5 16:06:45 CST 2025