CURLINFO_SSL_ENGINES(3) Introduction to Library Functions

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.

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 2026-01-08 CURLINFO_SSL_ENGINES(3)