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.

Lexicals I: lexicals outside an eval "\*(L" weren't resolved
correctly inside a subroutine definition inside the eval \*(R"\*(L" if they
were not already referenced in the top level of the eval\*(R""ed code.
.IP "\(bu" 4
Lexicals \s-1II:\s0 lexicals leaked at file scope into subroutines that
were declared before the lexicals.
.IP "\(bu" 4
Lvalue subroutines can now return \f(CW\*(C`undef\*(C'\fR in list context.
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The \f(CW\*(C`op_clear\*(C'\fR and \f(CW\*(C`op_null\*(C'\fR are now exported.
.IP "\(bu" 4
A new special regular expression variable has been introduced:
\&\f(CW$^N\fR, which contains the most-recently closed group (submatch).
.IP "\(bu" 4
utime now supports \f(CW\*(C`utime undef, undef, @files\*(C'\fR to change the
file timestamps to the current time.
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The Perl parser has been stress tested using both random input and
Markov chain input.
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\&\f(CW\*(C`eval "v200"\*(C'\fR now works.
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\&\s-1VMS\s0 now works under PerlIO.
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\&\s-1END\s0 blocks are now run even if you exit/die in a \s-1BEGIN\s0 block.
The execution of \s-1END\s0 blocks is now controlled by 
PL_exit_flags & \s-1PERL_EXIT_DESTRUCT_END\s0. This enables the new
behaviour for perl embedders. This will default in 5.10. See
perlembed.
.SH "Modules and Pragmata"
.IX Header "Modules and Pragmata"
.Sh "New Modules and Distributions"
.IX Subsection "New Modules and Distributions"
.IP "\(bu" 4
Attribute::Handlers \- Simpler definition of attribute handlers
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ExtUtils::Constant \- generate \s-1XS\s0 code to import C header constants
.IP "\(bu" 4
I18N::Langinfo \- query locale information
.IP "\(bu" 4
I18N::LangTags \- functions for dealing with RFC3066\-style language tags
.IP "\(bu" 4
libnet \- a collection of perl5 modules related to network programming
.Sp
Perl installation leaves libnet unconfigured, use \fIlibnetcfg\fR to configure.
.IP "\(bu" 4
List::Util \- selection of general-utility list subroutines
.IP "\(bu" 4
Locale::Maketext \- framework for localization
.IP "\(bu" 4
Memoize \- Make your functions faster by trading space for time
.IP "\(bu" 4
\&\s-1NEXT\s0 \- pseudo-class for method redispatch
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Scalar::Util \- selection of general-utility scalar subroutines
.IP "\(bu" 4
Test::More \- yet another framework for writing test scripts
.IP "\(bu" 4
Test::Simple \- Basic utilities for writing tests
.IP "\(bu" 4
Time::HiRes \- high resolution ualarm, usleep, and gettimeofday
.IP "\(bu" 4
Time::Piece \- Object Oriented time objects
.Sp
(Previously known as Time::Object.)
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Time::Seconds \- a simple \s-1API\s0 to convert seconds to other date values
.IP "\(bu" 4
UnicodeCD \- Unicode Character Database
.Sh "Updated And Improved Modules and Pragmata"
.IX Subsection "Updated And Improved Modules and Pragmata"
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B::Deparse module has been significantly enhanced.  It now
can deparse almost all of the standard test suite (so that the
tests still succeed).  There is a make target \*(L"test.deparse\*(R"
for trying this out.
.IP "\(bu" 4
Class::Struct now assigns the array/hash element if the accessor
is called with an array/hash element as the \fBsole\fR argument.
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Cwd extension is now (even) faster.
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DB_File extension has been updated to version 1.77.
.IP "\(bu" 4
Fcntl, Socket, and Sys::Syslog have been rewritten to use the
new-style constant dispatch section (see ExtUtils::Constant).
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File::Find is now (again) reentrant.  It also has been made
more portable.
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File::Glob now supports \f(CW\*(C`GLOB_LIMIT\*(C'\fR constant to limit the
size of the returned list of filenames.
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IO::Socket::INET now supports \f(CW\*(C`LocalPort\*(C'\fR of zero (usually meaning
that the operating system will make one up.)
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The vars pragma now supports declaring fully qualified variables.
(Something that \f(CW\*(C`our()\*(C'\fR does not and will not support.)
.SH "Utility Changes"
.IX Header "Utility Changes"
.IP "\(bu" 4
The \fIemacs/e2ctags.pl\fR is now much faster.
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h2ph now supports C trigraphs.
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h2xs uses the new ExtUtils::Constant module which will affect
newly created extensions that define constants.  Since the new code is
more correct (if you have two constants where the first one is a
prefix of the second one, the first constant \fBnever\fR gets defined),
less lossy (it uses integers for integer constant, as opposed to the
old code that used floating point numbers even for integer constants),
and slightly faster, you might want to consider regenerating your
extension code (the new scheme makes regenerating easy).
h2xs now also supports C trigraphs.
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libnetcfg has been added to configure the libnet.
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The \fIPod::Html\fR (and thusly pod2html) now allows specifying
a cache directory.
.SH "New Documentation"
.IX Header "New Documentation"
.IP "\(bu" 4
Locale::Maketext::TPJ13 is an article about software localization,
originally published in The Perl Journal #13, republished here with
kind permission.
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More \s-1README\s0.$PLATFORM files have been converted into pod, which also
means that they also be installed as perl$PLATFORM documentation
files.  The new files are perlapollo, perlbeos, perldgux,
perlhurd, perlmint, perlnetware, perlplan9, perlqnx,
and perltru64.
.IP "\(bu" 4
The \fITodo\fR and \fITodo\-5.6\fR files have been merged into perltodo.
.IP "\(bu" 4
Use of the \fIgprof\fR tool to profile Perl has been documented in
perlhack.  There is a make target \*(L"perl.gprof\*(R" for generating a
gprofiled Perl executable.
.SH "Installation and Configuration Improvements"
.IX Header "Installation and Configuration Improvements"
.Sh "New Or Improved Platforms"
.IX Subsection "New Or Improved Platforms"
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\&\s-1AIX\s0 should now work better with gcc, threads, and 64\-bitness.  Also the
long doubles support in \s-1AIX\s0 should be better now.  See perlaix.
.IP "\(bu" 4
AtheOS ( http://www.atheos.cx/ ) is a new platform.
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\&\s-1DG/UX\s0 platform now supports the 5.005\-style threads.  See perldgux.
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DYNIX/ptx platform (a.k.a. dynixptx) is supported at or near osvers 4.5.2.
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Several Mac \s-1OS\s0 (Classic) portability patches have been applied.  We
hope to get a fully working port by 5.8.0.  (The remaining problems
relate to the changed \s-1IO\s0 model of Perl.)  See perlmacos.
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Mac \s-1OS\s0 X (or Darwin) should now be able to build Perl even on \s-1HFS+\s0
filesystems.  (The case-insensitivity confused the Perl build process.)
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NetWare from Novell is now supported.  See perlnetware.
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The Amdahl \s-1UTS\s0 \s-1UNIX\s0 mainframe platform is now supported.
.Sh "Generic Improvements"
.IX Subsection "Generic Improvements"
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In \s-1AFS\s0 installations one can configure the root of the \s-1AFS\s0 to be
somewhere else than the default \fI/afs\fR by using the Configure
parameter \f(CW\*(C`\-Dafsroot=/some/where/else\*(C'\fR.
.IP "\(bu" 4
The version of Berkeley \s-1DB\s0 used when the Perl (and, presumably, the
DB_File extension) was built is now available as
\&\f(CW@Config{qw(db_version_major db_version_minor db_version_patch)}\fR
from Perl and as \f(CW\*(C`DB_VERSION_MAJOR_CFG DB_VERSION_MINOR_CFG
DB_VERSION_PATCH_CFG\*(C'\fR from C.
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The Thread extension is now not built at all under ithreads
(\f(CW\*(C`Configure \-Duseithreads\*(C'\fR) because it wouldn't work anyway (the
Thread extension requires being Configured with \f(CW\*(C`\-Duse5005threads\*(C'\fR).
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The \f(CW\*(C`B::Deparse\*(C'\fR compiler backend has been so significantly improved
that almost the whole Perl test suite passes after being deparsed.  A
make target has been added to help in further testing: \f(CW\*(C`make test.deparse\*(C'\fR.
.SH "Selected Bug Fixes"
.IX Header "Selected Bug Fixes"
.IP "\(bu" 5
The autouse pragma didn't work for Multi::Part::Function::Names.
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The behaviour of non-decimal but numeric string constants such as
\&\*(L"0x23\*(R" was platform-dependent: in some platforms that was seen as 35,
in some as 0, in some as a floating point number (don't ask).  This
was caused by Perl using the operating system libraries in a situation
where the result of the string to number conversion is undefined: now
Perl consistently handles such strings as zero in numeric contexts.
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dprofpp \-R didn't work.
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\&\s-1PERL5OPT\s0 with embedded spaces didn't work.
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Sys::Syslog ignored the \f(CW\*(C`LOG_AUTH\*(C'\fR constant.
.Sh "Platform Specific Changes and Fixes"
.IX Subsection "Platform Specific Changes and Fixes"
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Some versions of glibc have a broken \fImodfl()\fR.  This affects builds
with \f(CW\*(C`\-Duselongdouble\*(C'\fR.  This version of Perl detects this brokenness
and has a workaround for it.  The glibc release 2.2.2 is known to have
fixed the \fImodfl()\fR bug.
.SH "New or Changed Diagnostics"
.IX Header "New or Changed Diagnostics"
.IP "\(bu" 4
In the regular expression diagnostics the \f(CW\*(C`<< HERE\*(C'\fR marker
introduced in 5.7.0 has been changed to be \f(CW\*(C`<\-\- HERE\*(C'\fR since too
many people found the \f(CW\*(C`<<\*(C'\fR to be too similar to here-document
starters.
.IP "\(bu" 4
If you try to \*(L"pack\*(R" in perlfunc a number less than 0 or larger than 255
using the \f(CW"C"\fR format you will get an optional warning.  Similarly
for the \f(CW"c"\fR format and a number less than \-128 or more than 127.
.IP "\(bu" 4
Certain regex modifiers such as \f(CW\*(C`(?o)\*(C'\fR make sense only if applied to
the entire regex.  You will an optional warning if you try to do otherwise.
.IP "\(bu" 4
Using arrays or hashes as references (e.g. \f(CW\*(C`%foo\->{bar}\*(C'\fR has been
deprecated for a while.  Now you will get an optional warning.
.SH "Source Code Enhancements"
.IX Header "Source Code Enhancements"
.Sh "\s-1MAGIC\s0 constants"
.IX Subsection "MAGIC constants"
The \s-1MAGIC\s0 constants (e.g. \f(CW\*(AqP\*(Aq\fR) have been macrofied
(e.g. \f(CW\*(C`PERL_MAGIC_TIED\*(C'\fR) for better source code readability
and maintainability.
.Sh "Better commented code"
.IX Subsection "Better commented code"
\&\fIperly.c\fR, \fIsv.c\fR, and \fIsv.h\fR have now been extensively commented.
.Sh "Regex pre\-/post\-compilation items matched up"
.IX Subsection "Regex pre-/post-compilation items matched up"
The regex compiler now maintains a structure that identifies nodes in
the compiled bytecode with the corresponding syntactic features of the
original regex expression.  The information is attached to the new
\&\f(CW\*(C`offsets\*(C'\fR member of the \f(CW\*(C`struct regexp\*(C'\fR. See perldebguts for more
complete information.
.Sh "gcc \-Wall"
.IX Subsection "gcc -Wall"
The C code has been made much more \f(CW\*(C`gcc \-Wall\*(C'\fR clean.  Some warning
messages still remain, though, so if you are compiling with gcc you
will see some warnings about dubious practices.  The warnings are
being worked on.
.SH "New Tests"
.IX Header "New Tests"
Several new tests have been added, especially for the \fIlib\fR subsection.
.PP
The tests are now reported in a different order than in earlier Perls.
(This happens because the test scripts from under t/lib have been moved