CURLINFO_SSL_ENGINES(3)    Library Functions Manual    CURLINFO_SSL_ENGINES(3)

NAME
       CURLINFO_SSL_ENGINES - an slist of OpenSSL crypto-engines

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_SSL_ENGINES,
                                  struct curl_slist **engine_list);

DESCRIPTION
       Pass the address of a 'struct curl_slist *' to receive a linked-list of
       OpenSSL crypto-engines supported. Note that engines are normally
       implemented in separate dynamic libraries. Hence not all the returned
       engines may be available at runtime. NOTE: you must call
       curl_slist_free_all(3) on the list pointer once you are done with it,
       as libcurl does not free this data for you.

PROTOCOLS
       This functionality affects  all TLS based protocols: HTTPS, FTPS,
       IMAPS, POP3S, SMTPS etc. only

       This option works only with the following TLS backends: OpenSSL

EXAMPLE
       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode result;
           struct curl_slist *engines;
           result = curl_easy_getinfo(curl, CURLINFO_SSL_ENGINES, &engines);
           if((result == CURLE_OK) && engines) {
             /* we have a list, free it when done using it */
             curl_slist_free_all(engines);
           }

           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY
       Added in curl 7.12.3

RETURN VALUE
       curl_easy_getinfo(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
       CURLOPT_SSLENGINE(3), curl_easy_getinfo(3), curl_easy_setopt(3)

libcurl                           2026-09-02           CURLINFO_SSL_ENGINES(3)