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 If the socket is no longer valid, -1 is returned.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