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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 argu- ment 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) { CURLcode result; curl_easy_setopt(curl, CURLOPT_PREREQFUNCTION, prereq_callback); curl_easy_setopt(curl, CURLOPT_PREREQDATA, &prereq_data); result = curl_easy_perform(curl); curl_easy_cleanup(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) libcurl 2026-06-11 CURLOPT_PREREQDATA(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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