1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLINFO_ACTIVESOCKET 5Section: 3 6Source: libcurl 7See-also: 8 - CURLINFO_LASTSOCKET (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_ACTIVESOCKET - get the active socket 19 20# SYNOPSIS 21 22~~~c 23#include <curl/curl.h> 24 25CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_ACTIVESOCKET, 26 curl_socket_t *socket); 27~~~ 28 29# DESCRIPTION 30 31Pass a pointer to a curl_socket_t to receive the most recently active socket 32used for the transfer connection by this curl session. If the socket is no 33longer valid, *CURL_SOCKET_BAD* is returned. When you are finished working 34with the socket, you must call curl_easy_cleanup(3) as usual on the easy 35handle and let libcurl close the socket and cleanup other resources associated 36with the handle. This option returns the active socket only after the transfer 37is complete, and is typically used in combination with 38CURLOPT_CONNECT_ONLY(3), which skips the transfer phase. 39 40CURLINFO_ACTIVESOCKET(3) was added as a replacement for 41CURLINFO_LASTSOCKET(3) since that one is not working on all platforms. 42 43# EXAMPLE 44 45~~~c 46int main(void) 47{ 48 CURL *curl = curl_easy_init(); 49 if(curl) { 50 CURLcode res; 51 curl_socket_t sockfd; 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_ACTIVESOCKET, &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 7.45.0 72 73# RETURN VALUE 74 75Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. 76