user::grent.3

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "User::grent 3"
.TH User::grent 3 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
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.SH "NAME"
User::grent \- by\-name interface to Perl's built\-in getgr*() functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 5
\& use User::grent;
\& $gr = getgrgid(0) or die "No group zero";
\& if ( $gr\->name eq \*(Aqwheel\*(Aq && @{$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 \*(Aqwheel\*(Aq && @gr_members > 1 ) {
\&     print "gid zero name wheel, with other members";
\& } 
\&
\& $gr = getgr($whoever);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module's default exports override the core \fIgetgrent()\fR, \fIgetgruid()\fR,
and \fIgetgrnam()\fR functions, replacing them with versions that return
\&\*(L"User::grent\*(R" objects.  This object has methods that return the similarly
named structure field name from the C's passwd structure from \fIgrp.h\fR; 
namely name, passwd, gid, and members (not mem).  The first three
return scalars, the last an array reference.
.PP
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 \f(CW\*(C`gr_\*(C'\fR.  Thus, \f(CW\*(C`$group_obj\->gid()\*(C'\fR corresponds
to \f(CW$gr_gid\fR if you import the fields.  Array references are available as
regular array variables, so \f(CW\*(C`@{ $group_obj\->members() }\*(C'\fR would be
simply \f(CW@gr_members\fR.
.PP
The \fIgetpw()\fR function is a simple front-end that forwards
a numeric argument to \fIgetpwuid()\fR and the rest to \fIgetpwnam()\fR.
.PP
To access this functionality without the core overrides,
pass the \f(CW\*(C`use\*(C'\fR an empty import list, and then access
function functions with their full qualified names.
On the other hand, the built-ins are still available
via the \f(CW\*(C`CORE::\*(C'\fR pseudo-package.
.SH "NOTE"
.IX Header "NOTE"
While this class is currently implemented using the Class::Struct
module to build a struct-like class, you shouldn't rely upon this.
.SH "AUTHOR"
.IX Header "AUTHOR"
Tom Christiansen