curl_easy_duphandle.md (1874B)
1 --- 2 c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3 SPDX-License-Identifier: curl 4 Title: curl_easy_duphandle 5 Section: 3 6 Source: libcurl 7 See-also: 8 - curl_easy_cleanup (3) 9 - curl_easy_init (3) 10 - curl_easy_reset (3) 11 - curl_global_init (3) 12 Protocol: 13 - All 14 Added-in: 7.9 15 --- 16 17 # NAME 18 19 curl_easy_duphandle - clone an easy handle 20 21 # SYNOPSIS 22 23 ~~~c 24 #include <curl/curl.h> 25 26 CURL *curl_easy_duphandle(CURL *handle); 27 ~~~ 28 29 # DESCRIPTION 30 31 This function returns a new curl handle, a duplicate, using all the options 32 previously set in the input curl *handle*. Both handles can subsequently be 33 used independently and they must both be freed with curl_easy_cleanup(3). 34 35 Any options that the input handle has been told to point to (as opposed to 36 copy) with previous calls to curl_easy_setopt(3), are pointed to by the new 37 handle as well. You must therefore make sure to keep the data around until 38 both handles have been cleaned up. 39 40 The new handle does **not** inherit any state information, no connections, no 41 SSL sessions and no cookies. It also does not inherit any share object states 42 or options (created as if CURLOPT_SHARE(3) was set to NULL). 43 44 If the source handle has HSTS or alt-svc enabled, the duplicate gets data read 45 data from the main filename to populate the cache. 46 47 In multi-threaded programs, this function must be called in a synchronous way, 48 the input handle may not be in use when cloned. 49 50 # %PROTOCOLS% 51 52 # EXAMPLE 53 54 ~~~c 55 int main(void) 56 { 57 CURL *curl = curl_easy_init(); 58 if(curl) { 59 CURLcode res; 60 CURL *nother; 61 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); 62 nother = curl_easy_duphandle(curl); 63 res = curl_easy_perform(nother); 64 curl_easy_cleanup(nother); 65 curl_easy_cleanup(curl); 66 } 67 } 68 ~~~ 69 70 # %AVAILABILITY% 71 72 # RETURN VALUE 73 74 If this function returns NULL, something went wrong and no valid handle was 75 returned.