lwres_gethostent.html revision 8eea877894ea5bcf5cdd9ca124a8601ad421d753
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson - Copyright (C) 2000, 2001 Internet Software Consortium.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - Permission to use, copy, modify, and distribute this software for any
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - purpose with or without fee is hereby granted, provided that the above
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - copyright notice and this permission notice appear in all copies.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostent</TITLE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonNAME="GENERATOR"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCONTENT="Modular DocBook HTML Stylesheet Version 1.61
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFENTRY"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonBGCOLOR="#FFFFFF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonVLINK="#840084"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonALINK="#0000FF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostent</A
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFNAMEDIV"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname, lwres_gethostbyname2, lwres_gethostbyaddr, lwres_gethostent, lwres_sethostent, lwres_endhostent, lwres_gethostbyname_r, lwres_gethostbyaddr_r, lwres_gethostent_r, lwres_sethostent_r, lwres_endhostent_r -- lightweight resolver get network host entry</DIV
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFSYNOPSISDIV"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCSYNOPSIS"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCSYNOPSISINFO"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCDEF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent *
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlwres_gethostbyname</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>(const char *name);</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCDEF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent *
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlwres_gethostbyname2</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>(const char *name, int af);</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCDEF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent *
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlwres_gethostbyaddr</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>(const char *addr, int len, int type);</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCDEF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent *
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlwres_gethostent</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCDEF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlwres_sethostent</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>(int stayopen);</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCDEF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlwres_endhostent</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCDEF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent *
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlwres_gethostbyname_r</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>(const char *name, struct hostent *resbuf, char *buf, int buflen, int *error);</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCDEF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent *
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlwres_gethostbyaddr_r</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>(const char *addr, int len, int type, struct hostent *resbuf, char *buf, int buflen, int *error);</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCDEF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent *
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlwres_gethostent_r</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>(struct hostent *resbuf, char *buf, int buflen, int *error);</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCDEF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlwres_sethostent_r</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>(int stayopen);</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCDEF"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlwres_endhostent_r</CODE
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFSECT1"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>DESCRIPTION</H2
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>These functions provide hostname-to-address and
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonaddress-to-hostname lookups by means of the lightweight resolver.
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonThey are similar to the standard
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CITEREFENTRY"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFENTRYTITLE"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>gethostent</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonfunctions provided by most operating systems.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonwhich is usually defined in
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FILENAME"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PROGRAMLISTING"
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson>struct hostent {
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson char *h_name; /* official name of host */
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson char **h_aliases; /* alias list */
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson int h_addrtype; /* host address type */
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson int h_length; /* length of address */
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson char **h_addr_list; /* list of addresses from name server */
8eea877894ea5bcf5cdd9ca124a8601ad421d753Andreas Gustafsson#define h_addr h_addr_list[0] /* address, for backward compatibility */</PRE
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>The members of this structure are:
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="VARIABLELIST"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>The official (canonical) name of the host.</P
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>A NULL-terminated array of alternate names (nicknames) for the host.</P
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>h_addrtype</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>The type of address being returned —
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>PF_INET6</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>The length of the address in bytes.</P
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>h_addr_list</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonterminated array of network addresses for the host.
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonHost addresses are returned in network byte order.</P
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>For backward compatibility with very old software,
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonis the first address in
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>h_addr_list.</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostent()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_sethostent()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_endhostent()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostent_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_sethostent_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_endhostent_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonprovide iteration over the known host entries on systems that
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonprovide such functionality through facilities like
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FILENAME"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonor NIS. The lightweight resolver does not currently implement
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonthese functions; it only provides them as stub functions that always
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonreturn failure.</P
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname2()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlook up the hostname
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonalways looks for an IPv4 address while
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname2()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonlooks for an address of protocol family
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>PF_INET6</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson— IPv4 or IPV6 addresses respectively.
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonSuccessful calls of the functions return a
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonthe name that was looked up.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonis returned if the lookups by
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname2()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>Reverse lookups of addresses are performed by
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyaddr()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonis an address of length
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonbytes and protocol family
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>PF_INET6</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonis a thread-safe function for forward lookups.
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonIf an error occurs, an error code is returned in
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonis a pointer to a
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonwhich is initialised by a successful call to
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonis a buffer of length
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonbytes which is used to store the
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>h_addr_list</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonelements of the
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonSuccessful calls to
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonwhich is a pointer to the
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyaddr_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonis a thread-safe function that performs a reverse lookup of address
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonand is of protocol family
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>PF_INET6</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonIf an error occurs, the error code is returned in
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonThe other function parameters are identical to those in
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonis a pointer to a
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonwhich is initialised by a successful call to
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyaddr_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonis a buffer of length
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonbytes which is used to store the
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>h_addr_list</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonelements of the
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonSuccessful calls to
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyaddr_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonwhich is a pointer to the
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>"struct hostent"()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFSECT1"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>RETURN VALUES</H2
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname2()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyaddr()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostent()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonreturn NULL to indicate an error. In this case the global variable
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_h_errno</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonwill contain one of the following error codes defined in
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FILENAME"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="VARIABLELIST"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>HOST_NOT_FOUND</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>The host or address was not found.</P
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>A recoverable error occurred, e.g., a timeout.
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonRetrying the lookup may succeed.</P
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>NO_RECOVERY</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>A non-recoverable error occurred.</P
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>The name exists, but has no address information
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonassociated with it (or vice versa in the case
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonof a reverse lookup). The code NO_ADDRESS
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonis accepted as a synonym for NO_DATA for backwards
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssoncompatibility.</P
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CITEREFENTRY"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFENTRYTITLE"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_hstrerror</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssontranslates these error codes to suitable error messages.</P
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostent()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostent_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>Successful calls to
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyaddr_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssona pointer to the
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonthat was initialised by these functions.
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonif the lookups fail
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonwas too small to hold the list of addresses and names referenced by
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CONSTANT"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>h_addr_list</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonelements of the
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>struct hostent</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="PARAMETER"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonwas too small, both
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyaddr_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonset the global variable
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="ERRORCODE"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFSECT1"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CITEREFENTRY"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFENTRYTITLE"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>gethostent</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CITEREFENTRY"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFENTRYTITLE"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_getipnode</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="CITEREFENTRY"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFENTRYTITLE"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_hstrerror</SPAN
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="REFSECT1"
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname2()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyaddr()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_endhostent()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonare not thread safe; they return pointers to static data and
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonprovide error codes through a global variable.
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonThread-safe versions for name and address lookup are provided by
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyname_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FUNCTION"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>lwres_gethostbyaddr_r()</TT
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonrespectively.</P
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson>The resolver daemon does not currently support any non-DNS
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonname services such as
ddccd5811feff696ba460dabfb666ce61040f545Andreas GustafssonCLASS="FILENAME"
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafssonconsequently the above functions don't, either.</P