.\" generated by cd2nroff 0.1 from CURLINFO_SSL_ENGINES.md .TH CURLINFO_SSL_ENGINES 3 "2024-11-07" libcurl .SH NAME CURLINFO_SSL_ENGINES \- get an slist of OpenSSL crypto\-engines .SH SYNOPSIS .nf #include CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_SSL_ENGINES, struct curl_slist **engine_list); .fi .SH DESCRIPTION Pass the address of a \(aqstruct curl_slist *\(aq 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. \fBNOTE:\fP you must call \fIcurl_slist_free_all(3)\fP on the list pointer once you are done with it, as libcurl does not free this data for you. .SH PROTOCOLS This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. This option works only with the following TLS backends: OpenSSL .SH EXAMPLE .nf int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; struct curl_slist *engines; res = curl_easy_getinfo(curl, CURLINFO_SSL_ENGINES, &engines); if((res == CURLE_OK) && engines) { /* we have a list, free it when done using it */ curl_slist_free_all(engines); } curl_easy_cleanup(curl); } } .fi .SH AVAILABILITY Added in curl 7.12.3 .SH RETURN VALUE Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. .SH SEE ALSO .BR CURLOPT_SSLENGINE (3), .BR curl_easy_getinfo (3), .BR curl_easy_setopt (3)