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        !            23: .TH CURLOPT_DNS_LOCAL_IP4 3 "December 10, 2017" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_DNS_LOCAL_IP4 \- IPv4 address to bind DNS resolves to
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_LOCAL_IP4, char *address);
        !            31: .SH DESCRIPTION
        !            32: Set the local IPv4 \fIaddress\fP that the resolver should bind to. The
        !            33: argument should be of type char * and contain a single numerical IPv4 address
        !            34: as a string.  Set this option to NULL to use the default setting (don't bind
        !            35: to a specific IP address).
        !            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: All
        !            43: .SH EXAMPLE
        !            44: .nf
        !            45: CURL *curl = curl_easy_init();
        !            46: if(curl) {
        !            47:   curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/foo.bin");
        !            48:   curl_easy_setopt(curl, CURLOPT_DNS_LOCAL_IP4, "192.168.0.14");
        !            49:   ret = curl_easy_perform(curl);
        !            50:   curl_easy_cleanup(curl);
        !            51: }
        !            52: .fi
        !            53: .SH AVAILABILITY
        !            54: This option requires that libcurl was built with a resolver backend that
        !            55: supports this operation. The c-ares backend is the only such one.
        !            56: 
        !            57: Added in 7.33.0
        !            58: .SH RETURN VALUE
        !            59: Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not,
        !            60: CURLE_NOT_BUILT_IN if support was disabled at compile-time, or
        !            61: CURLE_BAD_FUNCTION_ARGUMENT when given a bad address.
        !            62: .SH "SEE ALSO"
        !            63: .BR CURLOPT_DNS_INTERFACE "(3), " CURLOPT_DNS_LOCAL_IP6 "(3), "