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