res_init(3) [osf1 man page]

res_init(3)						     Library Functions Manual						       res_init(3)

NAME

       res_init - Searches for a default domain name and Internet address

LIBRARY

       Standard C Library (libc.a, libc.so)

SYNOPSIS

       #include <sys/types.h> #include <netinet/in.h> #include <arpa/nameser.h> #include <resolv.h>
       void res_init ( void );

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/hosts file.  If the sys-
       tem 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

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

RELATED INFORMATION

       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).  delim off

																       res_init(3)

dn_expand(3)						     Library Functions Manual						      dn_expand(3)

NAME

       dn_expand - Expands a compressed domain name

LIBRARY

       Standard C Library (libc.a, libc.so)

SYNOPSIS

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

       int dn_expand (
	   const u_char *message_ptr,
	   const u_char *end_of_message,
	   const u_char *compressed_name,
	   char *expanded_name,
	   int length );

PARAMETERS

       Specifies  a  pointer  to  the beginning of a message.  Points to the end of the original message that contains the compressed domain name.
       Specifies a pointer to a compressed domain name.  Specifies a pointer to a buffer that holds the resulting expanded domain name.  Specifies
       the size of the buffer pointed to by the expanded_name parameter.

DESCRIPTION

       The dn_expand() function expands a compressed domain name to a full domain name, converting the expanded names to uppercase.

       The  dn_expand()  function  is  one  of a set of subroutines that form the resolver, a set of functions that resolves domain names.  Global
       information that is used by the resolver functions is kept in the _res data structure.	The   /include/resolv.h  file  contains  the  _res
       structure definition.

RETURN VALUES

       Upon successful completion, the dn_expand() function returns the size of the compressed domain name.  Otherwise, a value of -1 is returned.

ERRORS

       If  an  error  occurs  during  a  resolver  operation,  the h_errno external variable is set.  Error code values and reasons are defined in
       <netdb.h>.

FILES

       Defines name server and domain name constants, structures, and values.

RELATED INFORMATION

       Functions: dn_comp(3), dn_find(3), dn_skipname(3),  putshort(3),  putlong(3),  res_init(3),  res_mkquery(3),  res_query(3),  res_search(3),
       res_send(3), _getshort(3), _getlong(3).	delim off

																      dn_expand(3)