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        !            23: .TH CURLOPT_DNS_INTERFACE 3 "May 31, 2017" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_DNS_INTERFACE \- set interface to speak DNS over
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_INTERFACE, char *ifname);
        !            31: .SH DESCRIPTION
        !            32: Pass a char * as parameter. Set the name of the network interface that the DNS
        !            33: resolver should bind to. This must be an interface name (not an address). Set
        !            34: this option to NULL to use the default setting (don't bind to a specific
        !            35: interface).
        !            36: 
        !            37: The application does not have to keep the string around after setting this
        !            38: option.
        !            39: .SH DEFAULT
        !            40: NULL
        !            41: .SH PROTOCOLS
        !            42: .SH EXAMPLE
        !            43: .nf
        !            44: CURL *curl = curl_easy_init();
        !            45: if(curl) {
        !            46:   curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/foo.bin");
        !            47:   curl_easy_setopt(curl, CURLOPT_DNS_INTERFACE, "eth0");
        !            48:   ret = curl_easy_perform(curl);
        !            49:   curl_easy_cleanup(curl);
        !            50: }
        !            51: .fi
        !            52: .SH AVAILABILITY
        !            53: Added in 7.33.0. This option also requires that libcurl was built with a
        !            54: resolver backend that supports this operation. The c-ares backend is the only
        !            55: such one.
        !            56: .SH RETURN VALUE
        !            57: Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not,
        !            58: or CURLE_NOT_BUILT_IN if support was disabled at compile-time.
        !            59: .SH "SEE ALSO"
        !            60: .BR CURLOPT_DNS_SERVERS "(3), " CURLOPT_DNS_LOCAL_IP4 "(3), "