1package User::grent; 2use strict; 3 4use 5.005_64; 5our(@EXPORT, @EXPORT_OK, %EXPORT_TAGS); 6BEGIN { 7 use Exporter (); 8 @EXPORT = qw(getgrent getgrgid getgrnam getgr); 9 @EXPORT_OK = qw($gr_name $gr_gid $gr_passwd $gr_mem @gr_members); 10 %EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] ); 11} 12use vars @EXPORT_OK; 13 14# Class::Struct forbids use of @ISA 15sub import { goto &Exporter::import } 16 17use Class::Struct qw(struct); 18struct 'User::grent' => [ 19 name => '$', 20 passwd => '$', 21 gid => '$', 22 members => '@', 23]; 24 25sub populate (@) { 26 return unless @_; 27 my $gob = new(); 28 ($gr_name, $gr_passwd, $gr_gid) = @$gob[0,1,2] = @_[0,1,2]; 29 @gr_members = @{$gob->[3]} = split ' ', $_[3]; 30 return $gob; 31} 32 33sub getgrent ( ) { populate(CORE::getgrent()) } 34sub getgrnam ($) { populate(CORE::getgrnam(shift)) } 35sub getgrgid ($) { populate(CORE::getgrgid(shift)) } 36sub getgr ($) { ($_[0] =~ /^\d+/) ? &getgrgid : &getgrnam } 37 381; 39__END__ 40 41=head1 NAME 42 43User::grent - by-name interface to Perl's built-in getgr*() functions 44 45=head1 SYNOPSIS 46 47 use User::grent; 48 $gr = getgrgid(0) or die "No group zero"; 49 if ( $gr->name eq 'wheel' && @{$gr->members} > 1 ) { 50 print "gid zero name wheel, with other members"; 51 } 52 53 use User::grent qw(:FIELDS; 54 getgrgid(0) or die "No group zero"; 55 if ( $gr_name eq 'wheel' && @gr_members > 1 ) { 56 print "gid zero name wheel, with other members"; 57 } 58 59 $gr = getgr($whoever); 60 61=head1 DESCRIPTION 62 63This module's default exports override the core getgrent(), getgruid(), 64and getgrnam() functions, replacing them with versions that return 65"User::grent" objects. This object has methods that return the similarly 66named structure field name from the C's passwd structure from F<grp.h>; 67namely name, passwd, gid, and members (not mem). The first three 68return scalars, the last an array reference. 69 70You may also import all the structure fields directly into your namespace 71as regular variables using the :FIELDS import tag. (Note that this still 72overrides your core functions.) Access these fields as variables named 73with a preceding C<gr_>. Thus, C<$group_obj-E<gt>gid()> corresponds 74to $gr_gid if you import the fields. Array references are available as 75regular array variables, so C<@{ $group_obj-E<gt>members() }> would be 76simply @gr_members. 77 78The getpw() function is a simple front-end that forwards 79a numeric argument to getpwuid() and the rest to getpwnam(). 80 81To access this functionality without the core overrides, 82pass the C<use> an empty import list, and then access 83function functions with their full qualified names. 84On the other hand, the built-ins are still available 85via the C<CORE::> pseudo-package. 86 87=head1 NOTE 88 89While this class is currently implemented using the Class::Struct 90module to build a struct-like class, you shouldn't rely upon this. 91 92=head1 AUTHOR 93 94Tom Christiansen 95