NAME

       CURLOPT_LOCALPORTRANGE - number of additional local ports to try

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOCALPORTRANGE,
                                 long range);

DESCRIPTION

       Pass  a  long.  The  range  argument is the number of attempts libcurl will make to find a
       working local port number. It starts with the given CURLOPT_LOCALPORT(3) and adds  one  to
       the number for each retry. Setting this option to 1 or below will make libcurl do only one
       try for the exact port number. Port numbers by nature are scarce resources  that  will  be
       busy  at  times  so  setting  this  value  to  something  too  low might cause unnecessary
       connection setup failures.

DEFAULT

       1

PROTOCOLS

       All

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
         curl_easy_setopt(curl, CURLOPT_LOCALPORT, 49152L);
         /* and try 20 more ports following that */
         curl_easy_setopt(curl, CURLOPT_LOCALPORTRANGE, 20L);
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

AVAILABILITY

       Added in 7.15.2

RETURN VALUE

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

SEE ALSO

       CURLOPT_LOCALPORT(3), CURLOPT_INTERFACE(3),