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

NAME
       CURLOPT_OPENSOCKETDATA - custom pointer passed to open socket callback

SYNOPSIS
       #include <curl/curl.h>

       CURLcode  curl_easy_setopt(CURL  *handle,  CURLOPT_OPENSOCKETDATA, void
       *pointer);

DESCRIPTION
       Pass a pointer that will be untouched by  libcurl  and  passed  as  the
       first  argument in the opensocket callback set with CURLOPT_OPENSOCKET-
       FUNCTION(3).

DEFAULT
       The default value of this parameter is NULL.

PROTOCOLS
       All

EXAMPLE
       TODO

AVAILABILITY
       Added in 7.17.1

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

SEE ALSO
       CURLOPT_OPENSOCKETFUNCTION(3), CURLOPT_SOCKOPTFUNCTION(3),

libcurl 7.54.0                 February 03, 2016     CURLOPT_OPENSOCKETDATA(3)