Unknown option: "-3" Unix manual page for CURLINFO_TLS_SESSION. (host=minya system=Darwin)
CURLINFO_TLS_SESSION(3)    curl_easy_getinfo options   CURLINFO_TLS_SESSION(3)

NAME
       CURLINFO_TLS_SESSION - get TLS session info

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_TLS_SESSION,
                                  struct curl_tlssessioninfo **session);

DESCRIPTION
       This option has been superseded by CURLINFO_TLS_SSL_PTR(3) which was
       added in 7.48.0. The only reason you would use this option  instead  is
       if you could be using a version of libcurl earlier than 7.48.0.

       This  option  is  exactly the same as CURLINFO_TLS_SSL_PTR(3) except in
       the case of OpenSSL. If the session backend  is  CURLSSLBACKEND_OPENSSL
       the session internals pointer varies depending on the option:

       CURLINFO_TLS_SESSION OpenSSL session internals is SSL_CTX *.

       CURLINFO_TLS_SSL_PTR OpenSSL session internals is SSL *.

       You  can  obtain  an  SSL_CTX pointer from an SSL pointer using OpenSSL
       function SSL_get_SSL_CTX. Therefore unless you need compatibility  with
       older  versions  of  libcurl use CURLINFO_TLS_SSL_PTR(3). Refer to that
       document for more information.

PROTOCOLS
       All TLS-based

EXAMPLE
       TODO

AVAILABILITY
       Added in 7.34.0, and supported OpenSSL, GnuTLS, NSS and gskit  only  up
       until 7.48.0 was released.

RETURN VALUE
       Returns  CURLE_OK  if the option is supported, and CURLE_UNKNOWN_OPTION
       if not.

SEE ALSO
       curl_easy_getinfo(3), curl_easy_setopt(3), CURLINFO_TLS_SSL_PTR(3),

libcurl 7.54.0                  April 26, 2016         CURLINFO_TLS_SESSION(3)