1package User::grent; 2use strict; 3 4BEGIN { 5 use Exporter (); 6 use vars qw(@EXPORT @EXPORT_OK %EXPORT_TAGS); 7 @EXPORT = qw(getgrent getgrgid getgrnam getgr); 8 @EXPORT_OK = qw($gr_name $gr_gid $gr_passwd $gr_mem @gr_members); 9 %EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] ); 10} 11use vars @EXPORT_OK; 12 13# Class::Struct forbids use of @ISA 14sub import { goto &Exporter::import } 15 16use Class::Struct qw(struct); 17struct 'User::grent' => [ 18 name => '$', 19 passwd => '$', 20 gid => '$', 21 members => '@', 22]; 23 24sub populate (@) { 25 return unless @_; 26 my $gob = new(); 27 ($gr_name, $gr_passwd, $gr_gid) = @$gob[0,1,2] = @_[0,1,2]; 28 @gr_members = @{$gob->[3]} = split ' ', $_[3]; 29 return $gob; 30} 31 32sub getgrent ( ) { populate(CORE::getgrent()) } 33sub getgrnam ($) { populate(CORE::getgrnam(shift)) } 34sub getgrgid ($) { populate(CORE::getgrgid(shift)) } 35sub getgr ($) { ($_[0] =~ /^\d+/) ? &getgrgid : &getgrnam } 36 371; 38__END__ 39 40=head1 NAME 41 42User::grent - by-name interface to Perl's built-in getgr*() functions 43 44=head1 SYNOPSIS 45 46 use User::grent; 47 $gr = getgrgid(0) or die "No group zero"; 48 if ( $gr->name eq 'wheel' && @{$gr->members} > 1 ) { 49 print "gid zero name wheel, with other members"; 50 } 51 52 use User::grent qw(:FIELDS; 53 getgrgid(0) or die "No group zero"; 54 if ( $gr_name eq 'wheel' && @gr_members > 1 ) { 55 print "gid zero name wheel, with other members"; 56 } 57 58 $gr = getgr($whoever); 59 60=head1 DESCRIPTION 61 62This module's default exports override the core getgrent(), getgruid(), 63and getgrnam() functions, replacing them with versions that return 64"User::grent" objects. This object has methods that return the similarly 65named structure field name from the C's passwd structure from F<grp.h>; 66namely name, passwd, gid, and members (not mem). The first three 67return scalars, the last an array reference. 68 69You may also import all the structure fields directly into your namespace 70as regular variables using the :FIELDS import tag. (Note that this still 71overrides your core functions.) Access these fields as variables named 72with a preceding C<gr_>. Thus, C<$group_obj-E<gt>gid()> corresponds 73to $gr_gid if you import the fields. Array references are available as 74regular array variables, so C<@{ $group_obj-E<gt>members() }> would be 75simply @gr_members. 76 77The getpw() funtion is a simple front-end that forwards 78a numeric argument to getpwuid() and the rest to getpwnam(). 79 80To access this functionality without the core overrides, 81pass the C<use> an empty import list, and then access 82function functions with their full qualified names. 83On the other hand, the built-ins are still available 84via the C<CORE::> pseudo-package. 85 86=head1 NOTE 87 88While this class is currently implemented using the Class::Struct 89module to build a struct-like class, you shouldn't rely upon this. 90 91=head1 AUTHOR 92 93Tom Christiansen 94