lwres_getaddrinfo.html revision d4ef65050feac78554addf6e16a06c6e2e0bd331
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<!--
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk - Copyright (C) 2001 Internet Software Consortium.
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5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk - purpose with or without fee is hereby granted, provided that the above
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5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk -
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5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<!-- $Id: lwres_getaddrinfo.html,v 1.2 2001/04/10 21:51:38 bwelling Exp $ -->
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<HTML
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5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><TITLE
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk>lwres_getaddrinfo</TITLE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><META
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkNAME="GENERATOR"
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5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><H1
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><A
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkNAME="AEN1"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>lwres_getaddrinfo</A
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></H1
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DIV
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="REFNAMEDIV"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><A
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkNAME="AEN8"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></A
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><H2
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>Name</H2
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>lwres_getaddrinfo, lwres_freeaddrinfo&nbsp;--&nbsp;socket address structure to host and service name</DIV
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DIV
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="REFSYNOPSISDIV"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><A
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkNAME="AEN12"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></A
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><H2
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>Synopsis</H2
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DIV
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="FUNCSYNOPSIS"
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk><A
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkNAME="AEN13"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></A
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><PRE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="FUNCSYNOPSISINFO"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>#include &lt;lwres/netdb.h&gt;</PRE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><CODE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><CODE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="FUNCDEF"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>int
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenklwres_getaddrinfo</CODE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>(const char *hostname, const char *servname, const struct addrinfo *hints, struct addrinfo **res);</CODE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><CODE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><CODE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="FUNCDEF"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>void
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenklwres_freeaddrinfo</CODE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>(struct addrinfo *ai);</CODE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></DIV
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>If the operating system does not provide a
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="TYPE"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>struct addrinfo</SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>,
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkthe following structure is used:
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<PRE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="PROGRAMLISTING"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>struct addrinfo {
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk int ai_flags; /* AI_PASSIVE, AI_CANONNAME */
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk int ai_family; /* PF_xxx */
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk int ai_socktype; /* SOCK_xxx */
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk int ai_protocol; /* 0 or IPPROTO_xxx for IPv4 and IPv6 */
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk size_t ai_addrlen; /* length of ai_addr */
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk char *ai_canonname; /* canonical name for hostname */
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk struct sockaddr *ai_addr; /* binary address */
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk struct addrinfo *ai_next; /* next structure in linked list */
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk};</PRE
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></DIV
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DIV
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="REFSECT1"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><A
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkNAME="AEN29"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></A
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><H2
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>DESCRIPTION</H2
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="FUNCTION"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>lwres_getaddrinfo()</TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkis used to get a list of IP addresses and port numbers for host
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="PARAMETER"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>hostname</I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkand service
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="PARAMETER"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>servname</I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkThe function is the lightweight resolver's implementation of
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="FUNCTION"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>getaddrinfo()</TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkas defined in RFC2133.
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="PARAMETER"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>hostname</I
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk></TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkand
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="PARAMETER"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>servname</I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkare pointers to null-terminated
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkstrings or
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="TYPE"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>NULL</SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="PARAMETER"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>hostname</I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkis either a host name or a numeric host address string: a dotted decimal
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkIPv4 address or an IPv6 address.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="PARAMETER"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>servname</I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkis either a decimal port number or a service name as listed in
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="FILENAME"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>/etc/services</TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>.&#13;</P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="PARAMETER"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>hints</I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkis an optional pointer to a
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="TYPE"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>struct addrinfo</SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkThis structure can be used to provide hints concerning the type of socket
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenkthat the caller supports or wishes to use.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkThe caller can supply the following structure elements in
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="PARAMETER"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>*hints</I
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>:
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DIV
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="VARIABLELIST"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DL
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="CONSTANT"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>ai_family</TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></DT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DD
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>The protocol family that should be used.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkWhen
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="CONSTANT"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>ai_family</TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkis set to
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="TYPE"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>PF_UNSPEC</SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>,
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkit means the caller will accept any protocol family supported by the
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkoperating system.</P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></DD
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="CONSTANT"
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk>ai_socktype</TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></DT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DD
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>denotes the type of socket &mdash;
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="TYPE"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>SOCK_STREAM</SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>,
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="TYPE"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>SOCK_DGRAM</SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkor
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="TYPE"
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenk>SOCK_RAW</SPAN
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk&mdash; that is wanted.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkWhen
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="CONSTANT"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>ai_socktype</TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkis zero the caller will accept any socket type.</P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></DD
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><TT
dff2cc5646d4437ab9e0cb1dcb59da65462a5938jeff.schenkCLASS="CONSTANT"
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>ai_protocol</TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk></DT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><DD
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk><P
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk>indicates which transport protocol is wanted: IPPROTO_UDP or
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkIPPROTO_TCP.
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkIf
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenk<TT
5b64d5d44892834ba97f003080f3467299b7c5c5jeff.schenkCLASS="CONSTANT"
>ai_protocol</TT
>
is zero the caller will accept any protocol.</P
></DD
><DT
><TT
CLASS="CONSTANT"
>ai_flags</TT
></DT
><DD
><P
>Flag bits.
If the
<SPAN
CLASS="TYPE"
>AI_CANONNAME</SPAN
>
bit is set, a successful call to
<TT
CLASS="FUNCTION"
>lwres_getaddrinfo()</TT
>
will return a a null-terminated string containing the canonical name
of the specified hostname in
<TT
CLASS="CONSTANT"
>ai_canonname</TT
>
of the first
<SPAN
CLASS="TYPE"
>addrinfo</SPAN
>
structure returned.
Setting the
<SPAN
CLASS="TYPE"
>AI_PASSIVE</SPAN
>
bit indicates that the returned socket address structure is intended
for used in a call to
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>bind</SPAN
>(2)</SPAN
>.
In this case, if the hostname argument is a
<SPAN
CLASS="TYPE"
>NULL</SPAN
>
pointer, then the IP address portion of the socket
address structure will be set to
<SPAN
CLASS="TYPE"
>INADDR_ANY</SPAN
>
for an IPv4 address or
<SPAN
CLASS="TYPE"
>IN6ADDR_ANY_INIT</SPAN
>
for an IPv6 address.</P
><P
>When
<TT
CLASS="CONSTANT"
>ai_flags</TT
>
does not set the
<SPAN
CLASS="TYPE"
>AI_PASSIVE</SPAN
>
bit, the returned socket address structure will be ready
for use in a call to
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>connect</SPAN
>(2)</SPAN
>
for a connection-oriented protocol or
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>connect</SPAN
>(2)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>sendto</SPAN
>(2)</SPAN
>,
or
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>sendmsg</SPAN
>(2)</SPAN
>
if a connectionless protocol was chosen.
The IP address portion of the socket address structure will be
set to the loopback address if
<TT
CLASS="PARAMETER"
><I
>hostname</I
></TT
>
is a
<SPAN
CLASS="TYPE"
>NULL</SPAN
>
pointer and
<SPAN
CLASS="TYPE"
>AI_PASSIVE</SPAN
>
is not set in
<TT
CLASS="CONSTANT"
>ai_flags</TT
>.&#13;</P
><P
>If
<TT
CLASS="CONSTANT"
>ai_flags</TT
>
is set to
<SPAN
CLASS="TYPE"
>AI_NUMERICHOST</SPAN
>
it indicates that
<TT
CLASS="PARAMETER"
><I
>hostname</I
></TT
>
should be treated as a numeric string defining an IPv4 or IPv6 address
and no name resolution should be attempted.</P
></DD
></DL
></DIV
>&#13;</P
><P
>All other elements of the
<SPAN
CLASS="TYPE"
>struct addrinfo</SPAN
>
passed via
<TT
CLASS="PARAMETER"
><I
>hints</I
></TT
>
must be zero.</P
><P
>A
<TT
CLASS="PARAMETER"
><I
>hints</I
></TT
>
of
<SPAN
CLASS="TYPE"
>NULL</SPAN
>
is treated as if the caller provided a
<SPAN
CLASS="TYPE"
>struct addrinfo</SPAN
>
initialized to zero with
<TT
CLASS="CONSTANT"
>ai_family</TT
>set to
<TT
CLASS="CONSTANT"
>PF_UNSPEC</TT
>.&#13;</P
><P
>After a successful call to
<TT
CLASS="FUNCTION"
>lwres_getaddrinfo()</TT
>,
<TT
CLASS="PARAMETER"
><I
>*res</I
></TT
>
is a pointer to a linked list of one or more
<SPAN
CLASS="TYPE"
>addrinfo</SPAN
>
structures.
Each
<SPAN
CLASS="TYPE"
>struct addrinfo</SPAN
>
in this list cn be processed by following
the
<TT
CLASS="CONSTANT"
>ai_next</TT
>
pointer, until a
<SPAN
CLASS="TYPE"
>NULL</SPAN
>
pointer is encountered.
The three members
<TT
CLASS="CONSTANT"
>ai_family</TT
>,
<TT
CLASS="CONSTANT"
>ai_socktype</TT
>,
and
<TT
CLASS="CONSTANT"
>ai_protocol</TT
>
in each
returned
<SPAN
CLASS="TYPE"
>addrinfo</SPAN
>
structure contain the corresponding arguments for a call to
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>socket</SPAN
>(2)</SPAN
>.
For each
<SPAN
CLASS="TYPE"
>addrinfo</SPAN
>
structure in the list, the
<TT
CLASS="CONSTANT"
>ai_addr</TT
>
member points to a filled-in socket address structure of length
<TT
CLASS="CONSTANT"
>ai_addrlen</TT
>.&#13;</P
><P
>All of the information returned by
<TT
CLASS="FUNCTION"
>lwres_getaddrinfo()</TT
>
is dynamically allocated: the addrinfo structures, and the socket
address structures and canonical host name strings pointed to by the
<TT
CLASS="CONSTANT"
>addrinfo</TT
>structures.
Memory allocated for the dynamically allocated structures created by
a successful call to
<TT
CLASS="FUNCTION"
>lwres_getaddrinfo()</TT
>
is released by
<TT
CLASS="FUNCTION"
>lwres_freeaddrinfo()</TT
>.
<TT
CLASS="PARAMETER"
><I
>ai</I
></TT
>
is a pointer to a
<SPAN
CLASS="TYPE"
>struct addrinfo</SPAN
>
created by a call to
<TT
CLASS="FUNCTION"
>lwres_getaddrinfo()</TT
>.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN142"
></A
><H2
>RETURN VALUES</H2
><P
><TT
CLASS="FUNCTION"
>lwres_getaddrinfo()</TT
>
returns zero on success or one of the error codes listed in
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>gai_strerror</SPAN
>(3)</SPAN
>
if an error occurs.
If both
<TT
CLASS="PARAMETER"
><I
>hostname</I
></TT
>
and
<TT
CLASS="PARAMETER"
><I
>servname</I
></TT
>
are
<SPAN
CLASS="TYPE"
>NULL</SPAN
>
<TT
CLASS="FUNCTION"
>lwres_getaddrinfo()</TT
>
returns
<SPAN
CLASS="ERRORCODE"
>EAI_NONAME</SPAN
>.&#13;</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN154"
></A
><H2
>SEE ALSO</H2
><P
><SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>lwres</SPAN
>(3)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>lwres_getaddrinfo</SPAN
>(3)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>lwres_freeaddrinfo</SPAN
>(3)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>lwres_gai_strerror</SPAN
>(3)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>RFC2133</SPAN
></SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>getservbyname</SPAN
>(3)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>bind</SPAN
>(2)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>connect</SPAN
>(2)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>sendto</SPAN
>(2)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>sendmsg</SPAN
>(2)</SPAN
>,
<SPAN
CLASS="CITEREFENTRY"
><SPAN
CLASS="REFENTRYTITLE"
>socket</SPAN
>(2)</SPAN
>.</P
></DIV
></BODY
></HTML
>