IMPORTANT TODO: proper way of shutting down

Example Usage:
gcc -o dns.o *.c -lfcgi -lsodium -Wall -pthread
spawn-fcgi -a127.0.0.1 -p9000 -n ./dns.o

Server entry in nginx config:
server {
	#listen   80; ## listen for ipv4; this line is default and implied
	#listen   [::]:80 default_server ipv6only=on; ## listen for ipv6

	root /test/;

	server_name utox.org;

	location ~ \.png$ {
	}

	location / {
		fastcgi_pass   127.0.0.1:9000;
	      	fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
	      	fastcgi_param  SERVER_SOFTWARE    nginx;
	      	fastcgi_param  QUERY_STRING       $query_string;
	      	fastcgi_param  REQUEST_METHOD     $request_method;
	      	fastcgi_param  CONTENT_TYPE       $content_type;
	      	fastcgi_param  CONTENT_LENGTH     $content_length;
	      	fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name;
	      	fastcgi_param  SCRIPT_NAME        $fastcgi_script_name;
	      	fastcgi_param  REQUEST_URI        $request_uri;
	      	fastcgi_param  DOCUMENT_URI       $document_uri;
	     	fastcgi_param  DOCUMENT_ROOT      $document_root;
	      	fastcgi_param  SERVER_PROTOCOL    $server_protocol;
	     	fastcgi_param  REMOTE_ADDR        $remote_addr;
	     	fastcgi_param  REMOTE_PORT        $remote_port;
	     	fastcgi_param  SERVER_ADDR        $server_addr;
	     	fastcgi_param  SERVER_PORT        $server_port;
      		fastcgi_param  SERVER_NAME        $server_name;
	}
}