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.\" generated by cd2nroff 0.1 from CURLINFO_LASTSOCKET.md
.TH CURLINFO_LASTSOCKET 3 "2025-06-27" libcurl
.SH NAME
CURLINFO_LASTSOCKET \- get the last socket used
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_LASTSOCKET, long *socket);
.fi
.SH DESCRIPTION
Deprecated since 7.45.0. Use \fICURLINFO_ACTIVESOCKET(3)\fP instead.
Pass a pointer to a long to receive the last socket used by this curl
session. If the socket is no longer valid, \-1 is returned. When you finish
working with the socket, you must call \fIcurl_easy_cleanup(3)\fP as usual and
let libcurl close the socket and cleanup other resources associated with the
handle. This is typically used in combination with
\fICURLOPT_CONNECT_ONLY(3)\fP.
NOTE: this API is deprecated since it is not working on win64 where the SOCKET
type is 64 bits large while its \(aqlong\(aq is 32 bits. Use the
\fICURLINFO_ACTIVESOCKET(3)\fP instead, if possible.
.SH PROTOCOLS
This functionality affects all supported protocols
.SH EXAMPLE
.nf
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
long sockfd; /* does not work on win64 */
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_LASTSOCKET, &sockfd);
if(!res && sockfd != -1) {
/* operate on sockfd */
}
curl_easy_cleanup(curl);
}
}
.fi
.SH AVAILABILITY
Added in curl 7.15.2
.SH RETURN VALUE
\fIcurl_easy_getinfo(3)\fP returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLINFO_ACTIVESOCKET (3),
.BR CURLOPT_CONNECT_ONLY (3),
.BR curl_easy_getinfo (3),
.BR curl_easy_setopt (3)