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 makes 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 makes libcurl only do one try for
       the exact port number. Port numbers by nature are scarce resources that are busy at  times
       so  setting  this  value  to  something  too  low might cause unnecessary connection setup
       failures.

DEFAULT

       1

PROTOCOLS

       All

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           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);
           res = 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_INTERFACE(3), CURLOPT_LOCALPORT(3)