CURLOPT_LOCALPORTRANGE(3)  curl_easy_setopt options  CURLOPT_LOCALPORTRANGE(3)

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
       _LOCALPORT&section=3">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),

libcurl 7.77.0                 November 4, 2020      CURLOPT_LOCALPORTRANGE(3)