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Command: res_init | Section: 3 | Source: Digital UNIX | File: res_init.3.gz
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)
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 infor-
mation 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), _get-
long(3), _getshort(3), putlong(3), putshort(3), res_mkquery(3),
res_send(3) delim off
res_init(3)