Unknown option: "-3" Unix manual page for CURLOPT_CLOSESOCKETFUNCTION. (host=minya system=Darwin)
CURLOPT_CLOSESOCKETFUNCTIONcurl_easy_setopt optiCURLOPT_CLOSESOCKETFUNCTION(3)

NAME
       CURLOPT_CLOSESOCKETFUNCTION  -  callback  to  socket  close replacement
       function

SYNOPSIS
       #include <curl/curl.h>

       int closesocket_callback(void *clientp, curl_socket_t item);

       CURLcode  curl_easy_setopt(CURL  *handle,  CURLOPT_CLOSESOCKETFUNCTION,
       closesocket_callback);

DESCRIPTION
       Pass a pointer to your callback function, which should match the proto-
       type shown above.

       This callback function gets called by libcurl instead of  the  close(3)
       or  closesocket(3) call when sockets are closed (not for any other file
       descriptors). This is pretty much the reverse to the  CURLOPT_OPENSOCK-
       ETFUNCTION(3)  option. Return 0 to signal success and 1 if there was an
       error.

       The clientp pointer is set with CURLOPT_CLOSESOCKETDATA(3). item is the
       socket libcurl wants to be closed.

DEFAULT
       By default libcurl uses the standard socket close function.

PROTOCOLS
       All

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_CLOSESOCKETDATA(3), CURLOPT_OPENSOCKETFUNCTION(3),

libcurl 7.54.0                 February 03, 2016CURLOPT_CLOSESOCKETFUNCTION(3)