perl572delta.1

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 "PERL572DELTA 1"
.TH PERL572DELTA 1 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
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.SH "NAME"
perl572delta \- what's new for perl v5.7.2
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This document describes differences between the 5.7.1 release and the
5.7.2 release.
.PP
(To view the differences between the 5.6.0 release and the 5.7.0
release, see perl570delta.  To view the differences between the
5.7.0 release and the 5.7.1 release, see perl571delta.)
.SH "Security Vulnerability Closed"
.IX Header "Security Vulnerability Closed"
(This change was already made in 5.7.0 but bears repeating here.)
.PP
A security vulnerability affecting all Perl versions prior to 5.6.1
was found in August 2000.  The vulnerability does not affect default
installations and as far as is known affects only the Linux platform.
.PP
You should upgrade your Perl to 5.6.1 as soon as possible.  Patches
for earlier releases exist but using the patches require full
recompilation from the source code anyway, so 5.6.1 is your best
choice.
.PP
See http://www.cpan.org/src/5.0/sperl\-2000\-08\-05/sperl\-2000\-08\-05.txt
for more information.
.SH "Incompatible Changes"
.IX Header "Incompatible Changes"
.Sh "64\-bit platforms and malloc"
.IX Subsection "64-bit platforms and malloc"
If your pointers are 64 bits wide, the Perl malloc is no more being
used because it simply does not work with 8\-byte pointers.  Also,
usually the system malloc on such platforms are much better optimized
for such large memory models than the Perl malloc.
.Sh "\s-1AIX\s0 Dynaloading"
.IX Subsection "AIX Dynaloading"
The \s-1AIX\s0 dynaloading now uses in \s-1AIX\s0 releases 4.3 and newer the native
dlopen interface of \s-1AIX\s0 instead of the old emulated interface.  This
change will probably break backward compatibility with compiled
modules.  The change was made to make Perl more compliant with other
applications like modperl which are using the \s-1AIX\s0 native interface.
.Sh "Socket Extension Dynamic in \s-1VMS\s0"
.IX Subsection "Socket Extension Dynamic in VMS"
The Socket extension is now dynamically loaded instead of being
statically built in.  This may or may not be a problem with ancient
\&\s-1TCP/IP\s0 stacks of \s-1VMS:\s0 we do not know since we weren't able to test
Perl in such configurations.
.Sh "Different Definition of the Unicode Character Classes \ep{In...}"
.IX Subsection "Different Definition of the Unicode Character Classes p{In...}"
As suggested by the Unicode consortium, the Unicode character classes
now prefer \fIscripts\fR as opposed to \fIblocks\fR (as defined by Unicode);
in Perl, when the \f(CW\*(C`\ep{In....}\*(C'\fR and the \f(CW\*(C`\ep{In....}\*(C'\fR regular expression
constructs are used.  This has changed the definition of some of those
character classes.
.PP
The difference between scripts and blocks is that scripts are the
glyphs used by a language or a group of languages, while the blocks
are more artificial groupings of 256 characters based on the Unicode
numbering.
.PP
In general this change results in more inclusive Unicode character
classes, but changes to the other direction also do take place:
for example while the script \f(CW\*(C`Latin\*(C'\fR includes all the Latin
characters and their various diacritic-adorned versions, it
does not include the various punctuation or digits (since they
are not solely \f(CW\*(C`Latin\*(C'\fR).
.PP
Changes in the character class semantics may have happened if a script
and a block happen to have the same name, for example \f(CW\*(C`Hebrew\*(C'\fR.
In such cases the script wins and \f(CW\*(C`\ep{InHebrew}\*(C'\fR now means the script
definition of Hebrew.  The block definition in still available,
though, by appending \f(CW\*(C`Block\*(C'\fR to the name: \f(CW\*(C`\ep{InHebrewBlock}\*(C'\fR means
what \f(CW\*(C`\ep{InHebrew}\*(C'\fR meant in perl 5.6.0.  For the full list
of affected character classes, see \*(L"Blocks\*(R" in perlunicode.
.Sh "Deprecations"
.IX Subsection "Deprecations"
The current user-visible implementation of pseudo-hashes (the weird
use of the first array element) is deprecated starting from Perl 5.8.0
and will be removed in Perl 5.10.0, and the feature will be
implemented differently.  Not only is the current interface rather
ugly, but the current implementation slows down normal array and hash
use quite noticeably. The \f(CW\*(C`fields\*(C'\fR pragma interface will remain
available.
.PP
The syntaxes \f(CW\*(C`@a\->[...]\*(C'\fR and  \f(CW\*(C`@h\->{...}\*(C'\fR have now been deprecated.
.PP
The suidperl is also considered to be too much a risk to continue
maintaining and the suidperl code is likely to be removed in a future
release.
.PP
The \f(CW\*(C`package;\*(C'\fR syntax (\f(CW\*(C`package\*(C'\fR without an argument has been
deprecated.  Its semantics were never that clear and its
implementation even less so.  If you have used that feature to
disallow all but fully qualified variables, \f(CW\*(C`use strict;\*(C'\fR instead.
.PP
The chdir(undef) and chdir('') behaviors to match \fIchdir()\fR has been
deprecated.  In future versions, chdir(undef) and chdir('') will
simply fail.
.SH "Core Enhancements"
.IX Header "Core Enhancements"
In general a lot of fixing has happened in the area of Perl's
understanding of numbers, both integer and floating point.  Since in
many systems the standard number parsing functions like \f(CW\*(C`strtoul()\*(C'\fR
and \f(CW\*(C`atof()\*(C'\fR seem to have bugs, Perl tries to work around their
deficiencies.  This results hopefully in more accurate numbers.
.IP "\(bu" 4
The rules for allowing underscores (underbars) in numeric constants
have been relaxed and simplified: now you can have an underscore
\&\fBbetween digits\fR.
.IP "\(bu" 4
\&\s-1GMAGIC\s0 (right-hand side magic) could in many cases such as string
concatenation be invoked too many times.
.IP "\(bu" 4