87 lines
1.5 KiB
Markdown
87 lines
1.5 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_DEBUGDATA
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_DEBUGFUNCTION (3)
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- CURLOPT_STDERR (3)
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---
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# NAME
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CURLOPT_DEBUGDATA - pointer passed to the debug 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_DEBUGDATA, void *pointer);
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~~~
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# DESCRIPTION
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Pass a *pointer* to whatever you want passed in to your
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CURLOPT_DEBUGFUNCTION(3) in the last void * argument. This pointer is
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not used by libcurl, it is only passed to the callback.
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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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struct data {
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void *custom;
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};
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static int my_trace(CURL *handle, curl_infotype type,
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char *data, size_t size,
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void *clientp)
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{
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struct data *mine = clientp;
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printf("our ptr: %p\n", mine->custom);
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/* output debug info */
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}
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int main(void)
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{
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CURL *curl;
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CURLcode res;
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struct data my_tracedata;
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curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace);
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curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &my_tracedata);
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/* the DEBUGFUNCTION has no effect until we enable VERBOSE */
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curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
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res = curl_easy_perform(curl);
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/* always cleanup */
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curl_easy_cleanup(curl);
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}
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return 0;
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}
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~~~
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# AVAILABILITY
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Always
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# RETURN VALUE
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Returns CURLE_OK
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