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

NAME
       CURLOPT_CLOSESOCKETDATA - pointer passed to the socket close callback

SYNOPSIS
       #include <curl/curl.h>

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

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

DEFAULT
       The default value of this parameter is NULL.

PROTOCOLS
       All except file:

EXAMPLE
       TODO

AVAILABILITY
       Added in 7.21.7

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

SEE ALSO
       CURLOPT_CLOSESOCKETFUNCTION(3), CURLOPT_OPENSOCKETFUNCTION(3),

libcurl 7.54.0                 February 03, 2016    CURLOPT_CLOSESOCKETDATA(3)