perl5100delta.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.

prerequisite to install it. It's used by \f(CW\*(C`Archive::Tar\*(C'\fR (see below).
.IP "\(bu" 4
\&\f(CW\*(C`IO::Zlib\*(C'\fR is an \f(CW\*(C`IO::\*(C'\fR\-style interface to \f(CW\*(C`Compress::Zlib\*(C'\fR.
.IP "\(bu" 4
\&\f(CW\*(C`Archive::Tar\*(C'\fR is a module to manipulate \f(CW\*(C`tar\*(C'\fR archives.
.IP "\(bu" 4
\&\f(CW\*(C`Digest::SHA\*(C'\fR is a module used to calculate many types of \s-1SHA\s0 digests,
has been included for \s-1SHA\s0 support in the \s-1CPAN\s0 module.
.IP "\(bu" 4
\&\f(CW\*(C`ExtUtils::CBuilder\*(C'\fR and \f(CW\*(C`ExtUtils::ParseXS\*(C'\fR have been added.
.IP "\(bu" 4
\&\f(CW\*(C`Hash::Util::FieldHash\*(C'\fR, by Anno Siegel, has been added. This module
provides support for \fIfield hashes\fR: hashes that maintain an association
of a reference with a value, in a thread-safe garbage-collected way.
Such hashes are useful to implement inside-out objects.
.IP "\(bu" 4
\&\f(CW\*(C`Module::Build\*(C'\fR, by Ken Williams, has been added. It's an alternative to
\&\f(CW\*(C`ExtUtils::MakeMaker\*(C'\fR to build and install perl modules.
.IP "\(bu" 4
\&\f(CW\*(C`Module::Load\*(C'\fR, by Jos Boumans, has been added. It provides a single
interface to load Perl modules and \fI.pl\fR files.
.IP "\(bu" 4
\&\f(CW\*(C`Module::Loaded\*(C'\fR, by Jos Boumans, has been added. It's used to mark
modules as loaded or unloaded.
.IP "\(bu" 4
\&\f(CW\*(C`Package::Constants\*(C'\fR, by Jos Boumans, has been added. It's a simple
helper to list all constants declared in a given package.
.IP "\(bu" 4
\&\f(CW\*(C`Win32API::File\*(C'\fR, by Tye McQueen, has been added (for Windows builds).
This module provides low-level access to Win32 system \s-1API\s0 calls for
files/dirs.
.IP "\(bu" 4
\&\f(CW\*(C`Locale::Maketext::Simple\*(C'\fR, needed by \s-1CPANPLUS\s0, is a simple wrapper around
\&\f(CW\*(C`Locale::Maketext::Lexicon\*(C'\fR. Note that \f(CW\*(C`Locale::Maketext::Lexicon\*(C'\fR isn't
included in the perl core; the behaviour of \f(CW\*(C`Locale::Maketext::Simple\*(C'\fR
gracefully degrades when the later isn't present.
.IP "\(bu" 4
\&\f(CW\*(C`Params::Check\*(C'\fR implements a generic input parsing/checking mechanism. It
is used by \s-1CPANPLUS\s0.
.IP "\(bu" 4
\&\f(CW\*(C`Term::UI\*(C'\fR simplifies the task to ask questions at a terminal prompt.
.IP "\(bu" 4
\&\f(CW\*(C`Object::Accessor\*(C'\fR provides an interface to create per-object accessors.
.IP "\(bu" 4
\&\f(CW\*(C`Module::Pluggable\*(C'\fR is a simple framework to create modules that accept
pluggable sub-modules.
.IP "\(bu" 4
\&\f(CW\*(C`Module::Load::Conditional\*(C'\fR provides simple ways to query and possibly
load installed modules.
.IP "\(bu" 4
\&\f(CW\*(C`Time::Piece\*(C'\fR provides an object oriented interface to time functions,
overriding the built-ins \fIlocaltime()\fR and \fIgmtime()\fR.
.IP "\(bu" 4
\&\f(CW\*(C`IPC::Cmd\*(C'\fR helps to find and run external commands, possibly
interactively.
.IP "\(bu" 4
\&\f(CW\*(C`File::Fetch\*(C'\fR provide a simple generic file fetching mechanism.
.IP "\(bu" 4
\&\f(CW\*(C`Log::Message\*(C'\fR and \f(CW\*(C`Log::Message::Simple\*(C'\fR are used by the log facility
of \f(CW\*(C`CPANPLUS\*(C'\fR.
.IP "\(bu" 4
\&\f(CW\*(C`Archive::Extract\*(C'\fR is a generic archive extraction mechanism
for \fI.tar\fR (plain, gziped or bzipped) or \fI.zip\fR files.
.IP "\(bu" 4
\&\f(CW\*(C`CPANPLUS\*(C'\fR provides an \s-1API\s0 and a command-line tool to access the \s-1CPAN\s0
mirrors.
.IP "\(bu" 4
\&\f(CW\*(C`Pod::Escapes\*(C'\fR provides utilities that are useful in decoding Pod
E<...> sequences.
.IP "\(bu" 4
\&\f(CW\*(C`Pod::Simple\*(C'\fR is now the backend for several of the Pod-related modules
included with Perl.
.Sh "Selected Changes to Core Modules"
.IX Subsection "Selected Changes to Core Modules"
.ie n .IP """Attribute::Handlers""" 4
.el .IP "\f(CWAttribute::Handlers\fR" 4
.IX Item "Attribute::Handlers"
\&\f(CW\*(C`Attribute::Handlers\*(C'\fR can now report the caller's file and line number.
(David Feldman)
.Sp
All interpreted attributes are now passed as array references. (Damian
Conway)
.ie n .IP """B::Lint""" 4
.el .IP "\f(CWB::Lint\fR" 4
.IX Item "B::Lint"
\&\f(CW\*(C`B::Lint\*(C'\fR is now based on \f(CW\*(C`Module::Pluggable\*(C'\fR, and so can be extended
with plugins. (Joshua ben Jore)
.ie n .IP """B""" 4
.el .IP "\f(CWB\fR" 4
.IX Item "B"
It's now possible to access the lexical pragma hints (\f(CW\*(C`%^H\*(C'\fR) by using the
method \fIB::COP::hints_hash()\fR. It returns a \f(CW\*(C`B::RHE\*(C'\fR object, which in turn
can be used to get a hash reference via the method \fIB::RHE::HASH()\fR. (Joshua
ben Jore)
.ie n .IP """Thread""" 4
.el .IP "\f(CWThread\fR" 4
.IX Item "Thread"
As the old 5005thread threading model has been removed, in favor of the
ithreads scheme, the \f(CW\*(C`Thread\*(C'\fR module is now a compatibility wrapper, to
be used in old code only. It has been removed from the default list of
dynamic extensions.
.SH "Utility Changes"
.IX Header "Utility Changes"
.IP "perl \-d" 4
.IX Item "perl -d"
The Perl debugger can now save all debugger commands for sourcing later;
notably, it can now emulate stepping backwards, by restarting and
rerunning all bar the last command from a saved command history.
.Sp
It can also display the parent inheritance tree of a given class, with the
\&\f(CW\*(C`i\*(C'\fR command.
.IP "ptar" 4
.IX Item "ptar"
\&\f(CW\*(C`ptar\*(C'\fR is a pure perl implementation of \f(CW\*(C`tar\*(C'\fR that comes with
\&\f(CW\*(C`Archive::Tar\*(C'\fR.
.IP "ptardiff" 4
.IX Item "ptardiff"
\&\f(CW\*(C`ptardiff\*(C'\fR is a small utility used to generate a diff between the contents
of a tar archive and a directory tree. Like \f(CW\*(C`ptar\*(C'\fR, it comes with
\&\f(CW\*(C`Archive::Tar\*(C'\fR.
.IP "shasum" 4
.IX Item "shasum"
\&\f(CW\*(C`shasum\*(C'\fR is a command-line utility, used to print or to check \s-1SHA\s0
digests. It comes with the new \f(CW\*(C`Digest::SHA\*(C'\fR module.
.IP "corelist" 4
.IX Item "corelist"
The \f(CW\*(C`corelist\*(C'\fR utility is now installed with perl (see \*(L"New modules\*(R"
above).
.IP "h2ph and h2xs" 4
.IX Item "h2ph and h2xs"
\&\f(CW\*(C`h2ph\*(C'\fR and \f(CW\*(C`h2xs\*(C'\fR have been made more robust with regard to
\&\*(L"modern\*(R" C code.
.Sp
\&\f(CW\*(C`h2xs\*(C'\fR implements a new option \f(CW\*(C`\-\-use\-xsloader\*(C'\fR to force use of
\&\f(CW\*(C`XSLoader\*(C'\fR even in backwards compatible modules.
.Sp
The handling of authors' names that had apostrophes has been fixed.
.Sp
Any enums with negative values are now skipped.
.IP "perlivp" 4
.IX Item "perlivp"
\&\f(CW\*(C`perlivp\*(C'\fR no longer checks for \fI*.ph\fR files by default.  Use the new \f(CW\*(C`\-a\*(C'\fR
option to run \fIall\fR tests.
.IP "find2perl" 4
.IX Item "find2perl"
\&\f(CW\*(C`find2perl\*(C'\fR now assumes \f(CW\*(C`\-print\*(C'\fR as a default action. Previously, it
needed to be specified explicitly.
.Sp
Several bugs have been fixed in \f(CW\*(C`find2perl\*(C'\fR, regarding \f(CW\*(C`\-exec\*(C'\fR and
\&\f(CW\*(C`\-eval\*(C'\fR. Also the options \f(CW\*(C`\-path\*(C'\fR, \f(CW\*(C`\-ipath\*(C'\fR and \f(CW\*(C`\-iname\*(C'\fR have been
added.
.IP "config_data" 4
.IX Item "config_data"
\&\f(CW\*(C`config_data\*(C'\fR is a new utility that comes with \f(CW\*(C`Module::Build\*(C'\fR. It
provides a command-line interface to the configuration of Perl modules
that use Module::Build's framework of configurability (that is,
\&\f(CW*::ConfigData\fR modules that contain local configuration information for
their parent modules.)
.IP "cpanp" 4
.IX Item "cpanp"
\&\f(CW\*(C`cpanp\*(C'\fR, the \s-1CPANPLUS\s0 shell, has been added. (\f(CW\*(C`cpanp\-run\-perl\*(C'\fR, a
helper for \s-1CPANPLUS\s0 operation, has been added too, but isn't intended for
direct use).
.IP "cpan2dist" 4
.IX Item "cpan2dist"
\&\f(CW\*(C`cpan2dist\*(C'\fR is a new utility that comes with \s-1CPANPLUS\s0. It's a tool to
create distributions (or packages) from \s-1CPAN\s0 modules.
.IP "pod2html" 4
.IX Item "pod2html"
The output of \f(CW\*(C`pod2html\*(C'\fR has been enhanced to be more customizable via
\&\s-1CSS\s0. Some formatting problems were also corrected. (Jari Aalto)
.SH "New Documentation"
.IX Header "New Documentation"
The perlpragma manpage documents how to write one's own lexical
pragmas in pure Perl (something that is possible starting with 5.9.4).
.PP
The new perlglossary manpage is a glossary of terms used in the Perl
documentation, technical and otherwise, kindly provided by O'Reilly Media,
Inc.
.PP
The perlreguts manpage, courtesy of Yves Orton, describes internals of the
Perl regular expression engine.
.PP
The perlreapi manpage describes the interface to the perl interpreter
used to write pluggable regular expression engines (by \*(AEvar Arnfjo\*:r\*(d\-
Bjarmason).
.PP
The perlunitut manpage is an tutorial for programming with Unicode and
string encodings in Perl, courtesy of Juerd Waalboer.
.PP
A new manual page, perlunifaq (the Perl Unicode \s-1FAQ\s0), has been added
(Juerd Waalboer).
.PP
The perlcommunity manpage gives a description of the Perl community
on the Internet and in real life. (Edgar \*(L"Trizor\*(R" Bering)
.PP
The \s-1CORE\s0 manual page documents the \f(CW\*(C`CORE::\*(C'\fR namespace. (Tels)
.PP
The long-existing feature of \f(CW\*(C`/(?{...})/\*(C'\fR regexps setting \f(CW$_\fR and \fIpos()\fR
is now documented.
.SH "Performance Enhancements"
.IX Header "Performance Enhancements"
.Sh "In-place sorting"
.IX Subsection "In-place sorting"
Sorting arrays in place (\f(CW\*(C`@a = sort @a\*(C'\fR) is now optimized to avoid
making a temporary copy of the array.
.PP
Likewise, \f(CW\*(C`reverse sort ...\*(C'\fR is now optimized to sort in reverse,
avoiding the generation of a temporary intermediate list.
.Sh "Lexical array access"
.IX Subsection "Lexical array access"
Access to elements of lexical arrays via a numeric constant between 0 and
255 is now faster. (This used to be only the case for global arrays.)
.Sh "XS-assisted \s-1SWASHGET\s0"
.IX Subsection "XS-assisted SWASHGET"
Some pure-perl code that perl was using to retrieve Unicode properties and
transliteration mappings has been reimplemented in \s-1XS\s0.
.Sh "Constant subroutines"
.IX Subsection "Constant subroutines"
The interpreter internals now support a far more memory efficient form of
inlineable constants. Storing a reference to a constant value in a symbol
table is equivalent to a full typeglob referencing a constant subroutine,
but using about 400 bytes less memory. This proxy constant subroutine is
automatically upgraded to a real typeglob with subroutine if necessary.
The approach taken is analogous to the existing space optimisation for
subroutine stub declarations, which are stored as plain scalars in place
of the full typeglob.
.PP
Several of the core modules have been converted to use this feature for
their system dependent constants \- as a result \f(CW\*(C`use POSIX;\*(C'\fR now takes about
200K less memory.
.ie n .Sh """PERL_DONT_CREATE_GVSV"""
.el .Sh "\f(CWPERL_DONT_CREATE_GVSV\fP"
.IX Subsection "PERL_DONT_CREATE_GVSV"
The new compilation flag \f(CW\*(C`PERL_DONT_CREATE_GVSV\*(C'\fR, introduced as an option
in perl 5.8.8, is turned on by default in perl 5.9.3. It prevents perl
from creating an empty scalar with every new typeglob. See perl588delta
for details.
.Sh "Weak references are cheaper"
.IX Subsection "Weak references are cheaper"
Weak reference creation is now \fIO(1)\fR rather than \fIO(n)\fR, courtesy of
Nicholas Clark. Weak reference deletion remains \fIO(n)\fR, but if deletion only
happens at program exit, it may be skipped completely.
.Sh "\fIsort()\fP enhancements"
.IX Subsection "sort() enhancements"
Salvador Fandin\*~o provided improvements to reduce the memory usage of \f(CW\*(C`sort\*(C'\fR
and to speed up some cases.
.Sh "Memory optimisations"
.IX Subsection "Memory optimisations"
Several internal data structures (typeglobs, GVs, CVs, formats) have been
restructured to use less memory. (Nicholas Clark)
.Sh "\s-1UTF\-8\s0 cache optimisation"
.IX Subsection "UTF-8 cache optimisation"
The \s-1UTF\-8\s0 caching code is now more efficient, and used more often.
(Nicholas Clark)
.Sh "Sloppy stat on Windows"
.IX Subsection "Sloppy stat on Windows"
On Windows, perl's \fIstat()\fR function normally opens the file to determine
the link count and update attributes that may have been changed through
hard links. Setting ${^WIN32_SLOPPY_STAT} to a true value speeds up
\&\fIstat()\fR by not performing this operation. (Jan Dubois)
.Sh "Regular expressions optimisations"
.IX Subsection "Regular expressions optimisations"
.IP "Engine de-recursivised" 4
.IX Item "Engine de-recursivised"
The regular expression engine is no longer recursive, meaning that
patterns that used to overflow the stack will either die with useful
explanations, or run to completion, which, since they were able to blow
the stack before, will likely take a very long time to happen. If you were
experiencing the occasional stack overflow (or segfault) and upgrade to
discover that now perl apparently hangs instead, look for a degenerate
regex. (Dave Mitchell)
.IP "Single char char-classes treated as literals" 4
.IX Item "Single char char-classes treated as literals"
Classes of a single character are now treated the same as if the character