plucky (3) CURLOPT_LOCALPORTRANGE.3.gz

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

       This functionality affects all supported protocols

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 curl 7.15.2

RETURN VALUE

       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

SEE ALSO

       CURLOPT_INTERFACE(3), CURLOPT_LOCALPORT(3)