address-info

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            1  +<h1>Address Info API</h1>
            2  +
            3  +This CHICKEN module exposes <tt>getaddrinfo(3)</tt> functionality to Scheme.
            4  +
            5  +<verbatim>
            6  +  (require-extension address-info)
            7  +</verbatim>
            8  +
            9  +<h2>Address Info Record</h2>
           10  +
           11  +<verbatim>
           12  +  (define-record-type address-info
           13  +    (make-address-info family type host port)
           14  +    address-info?
           15  +    [family address-info-family]
           16  +    [type address-info-type]
           17  +    [host address-info-host]
           18  +    [port address-info-port])
           19  +</verbatim>
           20  +
           21  +Descriptor for an internet socket address. The family is either
           22  +<tt>'ipv4</tt> or <tt>'ipv6</tt>. The type is either <tt>'tcp</tt>,
           23  +<tt>'udp</tt> or <tt>'raw</tt>. The host is a numeric address encoded as
           24  +a string. The port is a either a positive integer or <tt>#f</tt>.
           25  +
           26  +<h2>Address Info Lookup</h2>
           27  +
           28  +<verbatim>
           29  +  (address-infos
           30  +   HOST [#:port PORT]
           31  +   [#:family FAMILY] [#:type TYPE]
           32  +   [#:server? BOOLEAN] [#:numeric? BOOLEAN])
           33  +  => (list ADDRESS-INFO ...) | #f
           34  +</verbatim>
           35  +
           36  +Tries to lookup socket addresses for the given host and/or port. If the
           37  +lookup is successful, the procedure returns a list of address
           38  +information records. Otherwise it returns <tt>#f</tt>.
           39  +
           40  +For a successful lookup you must at least specify a hostname or a port.
           41  +If no hostname is specified, the function defaults to server mode lookup
           42  +and will return wildcard addresses. This behaviour can be changed using
           43  +the <tt>#:server?</tt> flag.
           44  +
           45  +By default, the procedure will return address information records for
           46  +all suitable supported protocol families and socket types. The
           47  +<tt>#:family</tt> argument may be used to filter for <tt>'ipv4</tt> or
           48  +<tt>'ipv6</tt> addresses. The <tt>#:type</tt> argument may be used to
           49  +filter for <tt>'tcp</tt> / <tt>'stream</tt>, <tt>'udp</tt> /
           50  +<tt>'datagram</tt> or <tt>'raw</tt> socket types.
           51  +
           52  +Unless the <tt>#:numeric?</tt> flag is set to a true value, the
           53  +procedure will convert hostnames into numeric network addresses.