c: Copyright (C) Daniel Stenberg, <daniel.se>, et al. SPDX-License-Identifier: curl Title: CURLOPT_PREREQDATA Section: 3 Source: libcurl See-also:
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 is untouched by libcurl and passed as the first argument in the pre-request callback set with CURLOPT_PREREQFUNCTION(3).
NULL
All
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); } }
Added in 7.80.0
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.