1---
2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
3SPDX-License-Identifier: curl
4Title: CURLINFO_LASTSOCKET
5Section: 3
6Source: libcurl
7See-also:
8  - CURLINFO_ACTIVESOCKET (3)
9  - CURLOPT_CONNECT_ONLY (3)
10  - curl_easy_getinfo (3)
11  - curl_easy_setopt (3)
12Protocol:
13  - All
14Added-in: 7.15.2
15---
16
17# NAME
18
19CURLINFO_LASTSOCKET - get the last socket used
20
21# SYNOPSIS
22
23~~~c
24#include <curl/curl.h>
25
26CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_LASTSOCKET, long *socket);
27~~~
28
29# DESCRIPTION
30
31Deprecated since 7.45.0. Use CURLINFO_ACTIVESOCKET(3) instead.
32
33Pass a pointer to a long to receive the last socket used by this curl
34session. If the socket is no longer valid, -1 is returned. When you finish
35working with the socket, you must call curl_easy_cleanup(3) as usual and
36let libcurl close the socket and cleanup other resources associated with the
37handle. This is typically used in combination with
38CURLOPT_CONNECT_ONLY(3).
39
40NOTE: this API is deprecated since it is not working on win64 where the SOCKET
41type is 64 bits large while its 'long' is 32 bits. Use the
42CURLINFO_ACTIVESOCKET(3) instead, if possible.
43
44# %PROTOCOLS%
45
46# EXAMPLE
47
48~~~c
49int main(void)
50{
51  CURL *curl = curl_easy_init();
52  if(curl) {
53    CURLcode res;
54    long sockfd; /* does not work on win64 */
55    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
56
57    /* Do not do the transfer - only connect to host */
58    curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);
59    res = curl_easy_perform(curl);
60    if(res != CURLE_OK) {
61      printf("Error: %s\n", curl_easy_strerror(res));
62      curl_easy_cleanup(curl);
63      return 1;
64    }
65
66    /* Extract the socket from the curl handle */
67    res = curl_easy_getinfo(curl, CURLINFO_LASTSOCKET, &sockfd);
68    if(!res && sockfd != -1) {
69      /* operate on sockfd */
70    }
71
72    curl_easy_cleanup(curl);
73  }
74}
75~~~
76
77# %AVAILABILITY%
78
79# RETURN VALUE
80
81Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
82