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res_init(3)
NAME
  res_init - Search for a default domain name and Internet address

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

  void res_init(
	  void );

LIBRARY
  Standard C Library (libc)

DESCRIPTION
  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 information in
  the _res data structure.

NOTES
  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 contain the host
  IDs that the system requires to function even if the name server is not
  functioning.

FILES
  /etc/resolv.conf
      Contains the name server and domain name.

  /etc/hosts
      Contains hostnames and their addresses for hosts in a network. This
      file is used to resolve a hostname into an Internet address.

SEE ALSO
  Functions: dn_comp(3), dn_expand(3), dn_find(3), dn_skipname(3),
  _getlong(3), _getshort(3), putlong(3), putshort(3), res_mkquery(3),
  res_query(3), res_search(3), res_send(3).

Index for Section 3

Alphabetical listing for R

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