Manpages - CURLOPT_PREREQDATA.3

CURLOPT_PREREQDATA - pointer passed to the pre-request callback

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PREREQDATA, void *pointer);

Pass a pointer that will be untouched by libcurl and passed as the first argument in the pre-request callback set with CURLOPT_PREREQFUNCTION(3).

NULL

All

  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);
  }

Added in 7.80.0

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

*CURLOPT_PREREQFUNCTION*(3)