CURLOPT_RESOLVER_START_DATA(3)

1CURLOPT_RESOLVER_START_DATA(c3u)rl_easy_setopt optioCnUsRLOPT_RESOLVER_START_DATA(3)
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NAME

6       CURLOPT_RESOLVER_START_DATA  -  custom  pointer  passed to the resolver
7       start callback
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SYNOPSIS

10       #include <curl/curl.h>
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12       CURLcode  curl_easy_setopt(CURL  *handle,  CURLOPT_RESOLVER_START_DATA,
13       void *pointer);
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DESCRIPTION

16       Pass  a  pointer  that  will  be untouched by libcurl and passed as the
17       third argument in the resolver  start  callback  set  with  CURLOPT_RE‐
18       SOLVER_START_FUNCTION(3).
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DEFAULT

21       NULL
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PROTOCOLS

24       All
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EXAMPLE

27       static int resolver_start_cb(void *resolver_state, void *reserved,
28                                    void *userdata)
29       {
30         (void)reserved;
31         printf("Received resolver_state=%p userdata=%p\n",
32                resolver_state, userdata);
33         return 0;
34       }
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36       CURL *curl = curl_easy_init();
37       if(curl) {
38         curl_easy_setopt(curl, CURLOPT_RESOLVER_START_FUNCTION, resolver_start_cb);
39         curl_easy_setopt(curl, CURLOPT_RESOLVER_START_DATA, curl);
40         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
41         curl_easy_perform(curl);
42         curl_easy_cleanup(curl);
43       }
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AVAILABILITY

46       Added in 7.59.0
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RETURN VALUE

49       Returns CURLE_OK
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