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 is untouched by libcurl and passed as the first argument in the pre-request callback set with CURLOPT_PREREQFUNCTION(3).

DEFAULT

NULL

PROTOCOLS

This functionality affects all supported protocols

EXAMPLE

struct priv {


  void *custom;
};
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:%d\n", conn_primary_ip, conn_primary_port);


  return CURL_PREREQFUNC_OK;
}
int main(void)
{


  struct priv prereq_data;


  CURL *curl = curl_easy_init();


  if(curl) {


    curl_easy_setopt(curl, CURLOPT_PREREQFUNCTION, prereq_callback);


    curl_easy_setopt(curl, CURLOPT_PREREQDATA, &prereq_data);


    curl_easy_perform(curl);


  }
}

AVAILABILITY

Added in curl 7.80.0

RETURN VALUE

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).

SEE ALSO

CURLINFO_PRIMARY_IP(3), CURLINFO_PRIMARY_PORT(3), CURLOPT_PREREQFUNCTION(3)