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 If the socket is no longer valid, -1 is returned.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