71 lines
1.3 KiB
Markdown
71 lines
1.3 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_RESOLVER_START_DATA
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_PREREQFUNCTION (3)
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- CURLOPT_RESOLVER_START_FUNCTION (3)
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---
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# NAME
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CURLOPT_RESOLVER_START_DATA - pointer passed to the resolver start callback
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESOLVER_START_DATA,
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void *pointer);
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~~~
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# DESCRIPTION
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Pass a *pointer* is be untouched by libcurl and passed as the third
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argument in the resolver start callback set with
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CURLOPT_RESOLVER_START_FUNCTION(3).
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# DEFAULT
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NULL
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# PROTOCOLS
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All
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# EXAMPLE
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~~~c
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static int resolver_start_cb(void *resolver_state, void *reserved,
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void *userdata)
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{
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(void)reserved;
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printf("Received resolver_state=%p userdata=%p\n",
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resolver_state, userdata);
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return 0;
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}
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_RESOLVER_START_FUNCTION, resolver_start_cb);
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curl_easy_setopt(curl, CURLOPT_RESOLVER_START_DATA, curl);
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# AVAILABILITY
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Added in 7.59.0
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# RETURN VALUE
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Returns CURLE_OK
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