1package User::grent 1.05; 2use v5.38; 3 4our ($gr_name, $gr_gid, $gr_passwd, @gr_members); 5 6use Exporter 'import'; 7our @EXPORT = qw(getgrent getgrgid getgrnam getgr); 8our @EXPORT_OK = qw($gr_name $gr_gid $gr_passwd @gr_members); 9our %EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] ); 10 11use Class::Struct qw(struct); 12struct 'User::grent' => [ 13 name => '$', 14 passwd => '$', 15 gid => '$', 16 members => '@', 17]; 18 19sub populate { 20 return unless @_; 21 my $gob = new(); 22 ($gr_name, $gr_passwd, $gr_gid) = @$gob[0,1,2] = @_[0,1,2]; 23 @gr_members = @{$gob->[3]} = split ' ', $_[3]; 24 return $gob; 25} 26 27sub getgrent :prototype( ) { populate(CORE::getgrent()) } 28sub getgrnam :prototype($) { populate(CORE::getgrnam(shift)) } 29sub getgrgid :prototype($) { populate(CORE::getgrgid(shift)) } 30sub getgr :prototype($) { ($_[0] =~ /^\d+/) ? &getgrgid : &getgrnam } 31 32__END__ 33 34=head1 NAME 35 36User::grent - by-name interface to Perl's built-in getgr*() functions 37 38=head1 SYNOPSIS 39 40 use User::grent; 41 my $gr = getgrgid(0) or die "No group zero"; 42 if ( $gr->name eq 'wheel' && @{$gr->members} > 1 ) { 43 print "gid zero name wheel, with other members"; 44 } 45 46 use User::grent qw(:FIELDS); 47 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 my $gr = getgr($whoever); 53 54=head1 DESCRIPTION 55 56This module's default exports override the core getgrent(), getgrgid(), 57and getgrnam() functions, replacing them with versions that return 58"User::grent" objects. This object has methods that return the similarly 59named structure field name from the C's passwd structure from F<grp.h>; 60namely name, passwd, gid, and members (not mem). The first three 61return scalars, the last an array reference. 62 63You may also import all the structure fields directly into your namespace 64as regular variables using the :FIELDS import tag. (Note that this still 65overrides your core functions.) Access these fields as variables named 66with a preceding C<gr_>. Thus, C<$group_obj-E<gt>gid()> corresponds 67to $gr_gid if you import the fields. Array references are available as 68regular array variables, so C<@{ $group_obj-E<gt>members() }> would be 69simply @gr_members. 70 71The getgr() function is a simple front-end that forwards a numeric 72argument to getgrgid() and the rest to getgrnam(). 73 74To access this functionality without the core overrides, 75pass the C<use> an empty import list, and then access 76function functions with their full qualified names. 77On the other hand, the built-ins are still available 78via the C<CORE::> pseudo-package. 79 80=head1 NOTE 81 82While this class is currently implemented using the Class::Struct 83module to build a struct-like class, you shouldn't rely upon this. 84 85=head1 AUTHOR 86 87Tom Christiansen 88