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        !            23: .TH CURLOPT_LOCALPORTRANGE 3 "October 31, 2019" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_LOCALPORTRANGE \- number of additional local ports to try
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOCALPORTRANGE,
        !            31:                           long range);
        !            32: .SH DESCRIPTION
        !            33: Pass a long. The \fIrange\fP argument is the number of attempts libcurl will
        !            34: make to find a working local port number. It starts with the given
        !            35: \fICURLOPT_LOCALPORT(3)\fP and adds one to the number for each retry. Setting
        !            36: this option to 1 or below will make libcurl do only one try for the exact port
        !            37: number. Port numbers by nature are scarce resources that will be busy at times
        !            38: so setting this value to something too low might cause unnecessary connection
        !            39: setup failures.
        !            40: .SH DEFAULT
        !            41: 1
        !            42: .SH PROTOCOLS
        !            43: All
        !            44: .SH EXAMPLE
        !            45: .nf
        !            46: CURL *curl = curl_easy_init();
        !            47: if(curl) {
        !            48:   curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/foo.bin");
        !            49:   curl_easy_setopt(curl, CURLOPT_LOCALPORT, 49152L);
        !            50:   /* and try 20 more ports following that */
        !            51:   curl_easy_setopt(curl, CURLOPT_LOCALPORTRANGE, 20L);
        !            52:   ret = curl_easy_perform(curl);
        !            53:   curl_easy_cleanup(curl);
        !            54: }
        !            55: .fi
        !            56: .SH AVAILABILITY
        !            57: Added in 7.15.2
        !            58: .SH RETURN VALUE
        !            59: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
        !            60: .SH "SEE ALSO"
        !            61: .BR CURLOPT_LOCALPORT "(3), " CURLOPT_INTERFACE "(3), "