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

NAME
       CURLINFO_SIZE_DOWNLOAD - get the number of downloaded bytes

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_SIZE_DOWNLOAD, double
       *dlp);

DESCRIPTION
       Pass a pointer to a double to receive the total amount  of  bytes  that
       were  downloaded.   The amount is only for the latest transfer and will
       be reset again for each new transfer. This counts actual payload  data,
       what's also commonly called body. All meta and header data are excluded
       and will not be counted in this number.

PROTOCOLS
       All

EXAMPLE
       TODO

AVAILABILITY
       Added in 7.4.1

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),

libcurl 7.54.0                 February 03, 2016     CURLINFO_SIZE_DOWNLOAD(3)