res_init man page on DigitalUNIX

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res_init(3)							   res_init(3)

       res_init - Search for a default domain name and Internet address

       #include	    <sys/types.h>     #include	   <netinet/in.h>     #include
       <arpa/nameser.h> #include <resolv.h>

       void res_init(
	       void );

       Standard C Library (libc)

       The res_init() function reads the /etc/resolv.conf file for the default
       domain  name  and the Internet address of the initial hosts running the
       name server, even if the name server is not functioning.

       The res_init() function is one of a set of subroutines  that  form  the
       resolver,  a  set of functions that resolve domain names.  All resolver
       functions use the /usr/include/resolv.h header file, which defines  the
       _res data structure.  The res_init() function stores domain name infor‐
       mation in the _res data structure.

       If the /etc/resolv.conf file does not exist,  the  res_init()  function
       attempts name resolution using the local /etc/hostsfile.	 If the system
       is not using a domain name server, the /etc/resolv.conf file should not
       exist.	The /etc/host file should be present on the system even if the
       system is using a name server.  In this instance, the file should  con‐
       tain the host IDs that the system requires to function even if the name
       server is not functioning.

       Contains the name server and domain name.  Contains hostnames and their
       addresses  for hosts in a network. This file is used to resolve a host‐
       name into an Internet address.

       Functions: dn_comp(3), dn_expand(3), dn_find(3), dn_skipname(3),	 _get‐
       long(3),	  _getshort(3),	  putlong(3),	putshort(3),   res_mkquery(3),
       res_query(3), res_search(3), res_send(3).


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