curl / libcurl / API / curl_easy_setopt / CURLOPT_PREREQDATA

CURLOPT_PREREQDATA explained

Name

CURLOPT_PREREQDATA - pointer passed to the pre-request callback

Synopsis

#include <curl/curl.h>
 
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PREREQDATA, void *pointer);

Description

Pass a pointer that will be untouched by libcurl and passed as the first argument in the pre-request callback set with CURLOPT_PREREQFUNCTION.

Default

NULL

Protocols

All

Example

static int prereq_callback(void *clientp,
                           char *conn_primary_ip,
                           char *conn_local_ip,
                           int conn_primary_port,
                           int conn_local_port)
{
  printf("Connection made to %s:%s\n", conn_primary_ip, conn_primary_port);
  return CURL_PREREQFUNC_OK;
}
 
{
  struct data prereq_data;
  curl_easy_setopt(CURL *handle, CURLOPT_PREREQFUNCTION, prereq_callback);
  curl_easy_setopt(CURL *handle, CURLOPT_PREREQDATA, &prereq_data);
}

Availability

Added in 7.80.0

Return value

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.