1package User::grent; 2use strict; 3 4use 5.006_001; 5our $VERSION = '1.01'; 6our(@EXPORT, @EXPORT_OK, %EXPORT_TAGS); 7BEGIN { 8 use Exporter (); 9 @EXPORT = qw(getgrent getgrgid getgrnam getgr); 10 @EXPORT_OK = qw($gr_name $gr_gid $gr_passwd $gr_mem @gr_members); 11 %EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] ); 12} 13use vars @EXPORT_OK; 14 15# Class::Struct forbids use of @ISA 16sub import { goto &Exporter::import } 17 18use Class::Struct qw(struct); 19struct 'User::grent' => [ 20 name => '$', 21 passwd => '$', 22 gid => '$', 23 members => '@', 24]; 25 26sub populate (@) { 27 return unless @_; 28 my $gob = new(); 29 ($gr_name, $gr_passwd, $gr_gid) = @$gob[0,1,2] = @_[0,1,2]; 30 @gr_members = @{$gob->[3]} = split ' ', $_[3]; 31 return $gob; 32} 33 34sub getgrent ( ) { populate(CORE::getgrent()) } 35sub getgrnam ($) { populate(CORE::getgrnam(shift)) } 36sub getgrgid ($) { populate(CORE::getgrgid(shift)) } 37sub getgr ($) { ($_[0] =~ /^\d+/) ? &getgrgid : &getgrnam } 38 391; 40__END__ 41 42=head1 NAME 43 44User::grent - by-name interface to Perl's built-in getgr*() functions 45 46=head1 SYNOPSIS 47 48 use User::grent; 49 $gr = getgrgid(0) or die "No group zero"; 50 if ( $gr->name eq 'wheel' && @{$gr->members} > 1 ) { 51 print "gid zero name wheel, with other members"; 52 } 53 54 use User::grent qw(:FIELDS); 55 getgrgid(0) or die "No group zero"; 56 if ( $gr_name eq 'wheel' && @gr_members > 1 ) { 57 print "gid zero name wheel, with other members"; 58 } 59 60 $gr = getgr($whoever); 61 62=head1 DESCRIPTION 63 64This module's default exports override the core getgrent(), getgruid(), 65and getgrnam() functions, replacing them with versions that return 66"User::grent" objects. This object has methods that return the similarly 67named structure field name from the C's passwd structure from F<grp.h>; 68namely name, passwd, gid, and members (not mem). The first three 69return scalars, the last an array reference. 70 71You may also import all the structure fields directly into your namespace 72as regular variables using the :FIELDS import tag. (Note that this still 73overrides your core functions.) Access these fields as variables named 74with a preceding C<gr_>. Thus, C<$group_obj-E<gt>gid()> corresponds 75to $gr_gid if you import the fields. Array references are available as 76regular array variables, so C<@{ $group_obj-E<gt>members() }> would be 77simply @gr_members. 78 79The getpw() function is a simple front-end that forwards 80a numeric argument to getpwuid() and the rest to getpwnam(). 81 82To access this functionality without the core overrides, 83pass the C<use> an empty import list, and then access 84function functions with their full qualified names. 85On the other hand, the built-ins are still available 86via the C<CORE::> pseudo-package. 87 88=head1 NOTE 89 90While this class is currently implemented using the Class::Struct 91module to build a struct-like class, you shouldn't rely upon this. 92 93=head1 AUTHOR 94 95Tom Christiansen 96