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 14Added-in: 7.9 15--- 16 17# NAME 18 19curl_easy_duphandle - clone an easy handle 20 21# SYNOPSIS 22 23~~~c 24#include <curl/curl.h> 25 26CURL *curl_easy_duphandle(CURL *handle); 27~~~ 28 29# DESCRIPTION 30 31This function returns a new curl handle, a duplicate, using all the options 32previously set in the input curl *handle*. Both handles can subsequently be 33used independently and they must both be freed with curl_easy_cleanup(3). 34 35Any options that the input handle has been told to point to (as opposed to 36copy) with previous calls to curl_easy_setopt(3), are pointed to by the new 37handle as well. You must therefore make sure to keep the data around until 38both handles have been cleaned up. 39 40The new handle does **not** inherit any state information, no connections, no 41SSL sessions and no cookies. It also does not inherit any share object states 42or options (created as if CURLOPT_SHARE(3) was set to NULL). 43 44If the source handle has HSTS or alt-svc enabled, the duplicate gets data read 45data from the main filename to populate the cache. 46 47In multi-threaded programs, this function must be called in a synchronous way, 48the input handle may not be in use when cloned. 49 50# %PROTOCOLS% 51 52# EXAMPLE 53 54~~~c 55int 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 74If this function returns NULL, something went wrong and no valid handle was 75returned. 76
