User::grent(3p) Perl Programmers Reference Guide User::grent(3p)
User::grent - by-name interface to Perl's built-in getgr*()
functions
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);
This 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 similarly named structure field name
from the C's passwd structure from grp.h; namely name,
passwd, gid, and members (not mem). The first three return
scalars, the last an array reference.
You may also import all the structure fields directly into
your namespace as regular variables using the :FIELDS import
tag. (Note that this still overrides your core functions.)
Access these fields as variables named with a preceding
"gr_". Thus, "$group_obj->gid()" corresponds to $gr_gid if
you import the fields. Array references are available as
regular array variables, so "@{ $group_obj->members() }"
would be simply @gr_members.
The getpw() function is a simple front-end that forwards a
numeric argument to getpwuid() and the rest to getpwnam().
To access this functionality without the core overrides,
pass the "use" an empty import list, and then access func-
tion functions with their full qualified names. On the other
hand, the built-ins are still available via the "CORE::"
pseudo-package.
While this class is currently implemented using the
Class::Struct module to build a struct-like class, you
shouldn't rely upon this.
perl v5.8.8 2005-02-05 1
User::grent(3p) Perl Programmers Reference Guide User::grent(3p)
Tom Christiansen
perl v5.8.8 2005-02-05 2