package User::grent;use strict;use 5.005_64;our(@EXPORT, @EXPORT_OK, %EXPORT_TAGS);BEGIN {     use Exporter   ();    @EXPORT      = qw(getgrent getgrgid getgrnam getgr);    @EXPORT_OK   = qw($gr_name $gr_gid $gr_passwd $gr_mem @gr_members);    %EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] );}use vars      @EXPORT_OK;# Class::Struct forbids use of @ISAsub import { goto &Exporter::import }use Class::Struct qw(struct);struct 'User::grent' => [    name    => '$',    passwd  => '$',    gid	    => '$',    members => '@',];sub populate (@) {    return unless @_;    my $gob = new();    ($gr_name, $gr_passwd, $gr_gid) = @$gob[0,1,2] = @_[0,1,2];    @gr_members = @{$gob->[3]} = split ' ', $_[3];    return $gob;} sub getgrent ( ) { populate(CORE::getgrent()) } sub getgrnam ($) { populate(CORE::getgrnam(shift)) } sub getgrgid ($) { populate(CORE::getgrgid(shift)) } sub getgr    ($) { ($_[0] =~ /^\d+/) ? &getgrgid : &getgrnam } 1;__END__=head1 NAMEUser::grent - by-name interface to Perl's built-in getgr*() functions=head1 SYNOPSIS use User::grent; $gr = getgrgid(0) or die "No group zero"; if ( $gr->name eq 'wheel' && @{$gr->members} > 1 ) {     print "gid zero name wheel, with other members"; }  use User::grent qw(:FIELDS; getgrgid(0) or die "No group zero"; if ( $gr_name eq 'wheel' && @gr_members > 1 ) {     print "gid zero name wheel, with other members"; }  $gr = getgr($whoever);=head1 DESCRIPTIONThis module's default exports override the core getgrent(), getgruid(),and getgrnam() functions, replacing them with versions that return"User::grent" objects.  This object has methods that return the similarlynamed structure field name from the C's passwd structure from F<grp.h>; namely name, passwd, gid, and members (not mem).  The first threereturn scalars, the last an array reference.You may also import all the structure fields directly into your namespaceas regular variables using the :FIELDS import tag.  (Note that this stilloverrides your core functions.)  Access these fields as variables namedwith a preceding C<gr_>.  Thus, C<$group_obj-E<gt>gid()> correspondsto $gr_gid if you import the fields.  Array references are available asregular array variables, so C<@{ $group_obj-E<gt>members() }> would besimply @gr_members.The getpw() function is a simple front-end that forwardsa numeric argument to getpwuid() and the rest to getpwnam().To access this functionality without the core overrides,pass the C<use> an empty import list, and then accessfunction functions with their full qualified names.On the other hand, the built-ins are still availablevia the C<CORE::> pseudo-package.=head1 NOTEWhile this class is currently implemented using the Class::Structmodule to build a struct-like class, you shouldn't rely upon this.=head1 AUTHORTom Christiansen