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

NAME
       CURLINFO_OS_ERRNO - get errno number from last connect failure

SYNOPSIS
       #include <curl/curl.h>

       CURLcode   curl_easy_getinfo(CURL   *handle,   CURLINFO_OS_ERRNO,  long
       *errnop);

DESCRIPTION
       Pass a pointer to a long to receive the errno variable from  a  connect
       failure.   Note  that the value is only set on failure, it is not reset
       upon a successful operation. The number is OS and system specific.

PROTOCOLS
       All

EXAMPLE
       TODO

AVAILABILITY
       Added in 7.12.2

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_OS_ERRNO(3)