CURLOPT_PREREQDATA(3)      Library Functions Manual      CURLOPT_PREREQDATA(3)

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
       All

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 7.80.0

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

SEE ALSO
       CURLINFO_PRIMARY_IP(3), CURLINFO_PRIMARY_PORT(3),
       CURLOPT_PREREQFUNCTION(3)

libcurl                          April 26 2024           CURLOPT_PREREQDATA(3)