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Return the host's local domain.  (The same as the L<domainname>
program).  See L<yp_get_default_domain(3N)>.

=item ($status, $value) = yp_match($domain, $map, $key)

Return the $value for the given $key in the $map for the domain
$domain.  The $key must be an exact match for an item in the map (I<i.e.>
yp_match does no partial matching.  The $value is only valid if
$status is equal to $YP_SUCCESS.

=item ($status, $key, $value) = yp_first($domain, $map)

Return the first key-value pair from $map in $domain.  As the NIS maps
are stored in a DBM table, the order of the returned values is
not obvious.

=item ($status, $key, $value) = yp_next($domain, $map, $key)

Return the next key-value pair from $map in $domain.  The $key must be
provided from the previous L<yp_first> or L<yp_next>.  The
L<yp_first>/L<yp_next> method is not recommended, as under some
circumstances, entries can be skipped or returned twice.  L<yp_all> is
a better interface to use.

=item ($status, \%values) = yp_all($domain, $map)

The L<yp_all> call returns an entire map in the %values associative
array.

=item ($status, $order) = yp_order($domain, $map)

This function returns the order number for $domain.  Whatever that is.
It mustn't be very important, since it's not implemented on NIS+
servers running in "YP-compatibility mode".  I put it in for
completeness.

=item ($status, $name) = yp_master($domain, $map)

Returns the machine name of the master server for a map.

=item $error = yperr_string($status)

Returns a string representation of the error code passed in $status.

=item $status = ypprot_err($code)

Translates a NIS name service protocol error code to a ypclnt layer
error code.  Only used for the C version of L<yp_all>, and it is only
implemented here for completeness.

=back

=head1 ERROR CODES

The $status variable returned by the above functions can have one of
the following values:

  $Net::NIS::ERR_ACCESS		Access violation
  $Net::NIS::ERR_BADARGS	Args to function are bad
  $Net::NIS::ERR_BADDB		yp data base is bad
  $Net::NIS::ERR_BUSY		Database is busy
  $Net::NIS::ERR_DOMAIN		Can't bind to a server which serves this domain
  $Net::NIS::ERR_KEY		No such key in map
  $Net::NIS::ERR_MAP		No such map in server's domain
  $Net::NIS::ERR_NODOM		Local domain name not set
  $Net::NIS::ERR_PMAP		Can't communicate with portmapper
  $Net::NIS::ERR_NOMORE		No more records in map database
  $Net::NIS::ERR_RESRC		Local resource allocation failure
  $Net::NIS::ERR_RPC		RPC failure
  $Net::NIS::ERR_YPBIND		Can't communicate with ypbind
  $Net::NIS::ERR_YPERR		Internal yp server or client interface error
  $Net::NIS::ERR_YPSERV		Can't communicate with ypserv
  $Net::NIS::ERR_VERS		YP version mismatch

=head1 AUTHOR

Copyright (c) 1995 Rik Harris (B<rik.harris@fulcrum.com.au>). All
rights reserved.  This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.

The Network Information Service (NIS) was formerly known as Sun Yellow
Pages (YP). The functionality of the two remains the same; only the   
name has changed.  The name Yellow Pages is a registered trademark in
the United Kingdom of British Telecommunications plc, and may not be  
used without permission.