Man page - curlopt_trailerdata(3)

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Package: libcurl4-doc
apt-get install libcurl4-doc

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CURLOPT_TRAILERDATA - pointer passed to trailing headers callback

#include <curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TRAILERDATA, void *userdata);

Data pointer to be passed to the HTTP trailer callback function.

NULL

This functionality affects http only

struct MyData {
void *custom;
};

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
struct MyData data;
curl_easy_setopt(curl, CURLOPT_TRAILERDATA, &data);
}
}

Added in curl 7.64.0

curl_easy_setopt(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3) .