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.

had been used as a literal, meaning that code that uses char-classes as an
escaping mechanism will see a speedup. (Yves Orton)
.IP "Trie optimisation of literal string alternations" 4
.IX Item "Trie optimisation of literal string alternations"
Alternations, where possible, are optimised into more efficient matching
structures. String literal alternations are merged into a trie and are
matched simultaneously.  This means that instead of O(N) time for matching
N alternations at a given point, the new code performs in O(1) time.
A new special variable, ${^RE_TRIE_MAXBUF}, has been added to fine-tune
this optimization. (Yves Orton)
.Sp
\&\fBNote:\fR Much code exists that works around perl's historic poor
performance on alternations. Often the tricks used to do so will disable
the new optimisations. Hopefully the utility modules used for this purpose
will be educated about these new optimisations.
.IP "Aho-Corasick start-point optimisation" 4
.IX Item "Aho-Corasick start-point optimisation"
When a pattern starts with a trie-able alternation and there aren't
better optimisations available, the regex engine will use Aho-Corasick
matching to find the start point. (Yves Orton)
.SH "Installation and Configuration Improvements"
.IX Header "Installation and Configuration Improvements"
.Sh "Configuration improvements"
.IX Subsection "Configuration improvements"
.ie n .IP """\-Dusesitecustomize""" 4
.el .IP "\f(CW\-Dusesitecustomize\fR" 4
.IX Item "-Dusesitecustomize"
Run-time customization of \f(CW@INC\fR can be enabled by passing the
\&\f(CW\*(C`\-Dusesitecustomize\*(C'\fR flag to Configure. When enabled, this will make perl
run \fI\f(CI$sitelibexp\fI/sitecustomize.pl\fR before anything else.  This script can
then be set up to add additional entries to \f(CW@INC\fR.
.IP "Relocatable installations" 4
.IX Item "Relocatable installations"
There is now Configure support for creating a relocatable perl tree. If
you Configure with \f(CW\*(C`\-Duserelocatableinc\*(C'\fR, then the paths in \f(CW@INC\fR (and
everything else in \f(CW%Config\fR) can be optionally located via the path of the
perl executable.
.Sp
That means that, if the string \f(CW".../"\fR is found at the start of any
path, it's substituted with the directory of $^X. So, the relocation can
be configured on a per-directory basis, although the default with
\&\f(CW\*(C`\-Duserelocatableinc\*(C'\fR is that everything is relocated. The initial
install is done to the original configured prefix.
.IP "\fIstrlcat()\fR and \fIstrlcpy()\fR" 4
.IX Item "strlcat() and strlcpy()"
The configuration process now detects whether \fIstrlcat()\fR and \fIstrlcpy()\fR are
available.  When they are not available, perl's own version is used (from
Russ Allbery's public domain implementation).  Various places in the perl
interpreter now use them. (Steve Peters)
.ie n .IP """d_pseudofork""\fR and \f(CW""d_printf_format_null""" 4
.el .IP "\f(CWd_pseudofork\fR and \f(CWd_printf_format_null\fR" 4
.IX Item "d_pseudofork and d_printf_format_null"
A new configuration variable, available as \f(CW$Config{d_pseudofork}\fR in
the Config module, has been added, to distinguish real \fIfork()\fR support
from fake pseudofork used on Windows platforms.
.Sp
A new configuration variable, \f(CW\*(C`d_printf_format_null\*(C'\fR, has been added, 
to see if printf-like formats are allowed to be \s-1NULL\s0.
.IP "Configure help" 4
.IX Item "Configure help"
\&\f(CW\*(C`Configure \-h\*(C'\fR has been extended with the most commonly used options.
.Sh "Compilation improvements"
.IX Subsection "Compilation improvements"
.IP "Parallel build" 4
.IX Item "Parallel build"
Parallel makes should work properly now, although there may still be problems
if \f(CW\*(C`make test\*(C'\fR is instructed to run in parallel.
.IP "Borland's compilers support" 4
.IX Item "Borland's compilers support"
Building with Borland's compilers on Win32 should work more smoothly. In
particular Steve Hay has worked to side step many warnings emitted by their
compilers and at least one C compiler internal error.
.IP "Static build on Windows" 4
.IX Item "Static build on Windows"
Perl extensions on Windows now can be statically built into the Perl \s-1DLL\s0.
.Sp
Also, it's now possible to build a \f(CW\*(C`perl\-static.exe\*(C'\fR that doesn't depend
on the Perl \s-1DLL\s0 on Win32. See the Win32 makefiles for details.
(Vadim Konovalov)
.IP "ppport.h files" 4
.IX Item "ppport.h files"
All \fIppport.h\fR files in the \s-1XS\s0 modules bundled with perl are now
autogenerated at build time. (Marcus Holland-Moritz)
.IP "\*(C+ compatibility" 4
.IX Item " compatibility"
Efforts have been made to make perl and the core \s-1XS\s0 modules compilable
with various \*(C+ compilers (although the situation is not perfect with
some of the compilers on some of the platforms tested.)
.IP "Support for Microsoft 64\-bit compiler" 4
.IX Item "Support for Microsoft 64-bit compiler"
Support for building perl with Microsoft's 64\-bit compiler has been
improved. (ActiveState)
.IP "Visual \*(C+" 4
.IX Item "Visual "
Perl can now be compiled with Microsoft Visual \*(C+ 2005 (and 2008 Beta 2).
.IP "Win32 builds" 4
.IX Item "Win32 builds"
All win32 builds (MS-Win, WinCE) have been merged and cleaned up.
.Sh "Installation improvements"
.IX Subsection "Installation improvements"
.IP "Module auxiliary files" 4
.IX Item "Module auxiliary files"
\&\s-1README\s0 files and changelogs for \s-1CPAN\s0 modules bundled with perl are no
longer installed.
.Sh "New Or Improved Platforms"
.IX Subsection "New Or Improved Platforms"
Perl has been reported to work on Symbian \s-1OS\s0. See perlsymbian for more
information.
.PP
Many improvements have been made towards making Perl work correctly on
z/OS.
.PP
Perl has been reported to work on DragonFlyBSD and MidnightBSD.
.PP
Perl has also been reported to work on NexentaOS
( http://www.gnusolaris.org/ ).
.PP
The \s-1VMS\s0 port has been improved. See perlvms.
.PP
Support for Cray \s-1XT4\s0 Catamount/Qk has been added. See
\&\fIhints/catamount.sh\fR in the source code distribution for more
information.
.PP
Vendor patches have been merged for RedHat and Gentoo.
.PP
\&\fIDynaLoader::dl_unload_file()\fR now works on Windows.
.SH "Selected Bug Fixes"
.IX Header "Selected Bug Fixes"
.IP "strictures in regexp-eval blocks" 4
.IX Item "strictures in regexp-eval blocks"
\&\f(CW\*(C`strict\*(C'\fR wasn't in effect in regexp-eval blocks (\f(CW\*(C`/(?{...})/\*(C'\fR).
.IP "Calling \fICORE::require()\fR" 4
.IX Item "Calling CORE::require()"
\&\fICORE::require()\fR and \fICORE::do()\fR were always parsed as \fIrequire()\fR and \fIdo()\fR
when they were overridden. This is now fixed.
.IP "Subscripts of slices" 4
.IX Item "Subscripts of slices"
You can now use a non-arrowed form for chained subscripts after a list
slice, like in:
.Sp
.Vb 1
\&    ({foo => "bar"})[0]{foo}
.Ve
.Sp
This used to be a syntax error; a \f(CW\*(C`\->\*(C'\fR was required.
.ie n .IP """no warnings \*(Aqcategory\*(Aq"" works correctly with \-w" 4
.el .IP "\f(CWno warnings \*(Aqcategory\*(Aq\fR works correctly with \-w" 4
.IX Item "no warnings category works correctly with -w"
Previously when running with warnings enabled globally via \f(CW\*(C`\-w\*(C'\fR, selective
disabling of specific warning categories would actually turn off all warnings.
This is now fixed; now \f(CW\*(C`no warnings \*(Aqio\*(Aq;\*(C'\fR will only turn off warnings in the
\&\f(CW\*(C`io\*(C'\fR class. Previously it would erroneously turn off all warnings.
.IP "threads improvements" 4
.IX Item "threads improvements"
Several memory leaks in ithreads were closed. Also, ithreads were made
less memory-intensive.
.Sp
\&\f(CW\*(C`threads\*(C'\fR is now a dual-life module, also available on \s-1CPAN\s0. It has been
expanded in many ways. A \fIkill()\fR method is available for thread signalling.
One can get thread status, or the list of running or joinable threads.
.Sp
A new \f(CW\*(C`threads\->exit()\*(C'\fR method is used to exit from the application
(this is the default for the main thread) or from the current thread only
(this is the default for all other threads). On the other hand, the \fIexit()\fR
built-in now always causes the whole application to terminate. (Jerry
D. Hedden)
.IP "\fIchr()\fR and negative values" 4
.IX Item "chr() and negative values"
\&\fIchr()\fR on a negative value now gives \f(CW\*(C`\ex{FFFD}\*(C'\fR, the Unicode replacement
character, unless when the \f(CW\*(C`bytes\*(C'\fR pragma is in effect, where the low
eight bits of the value are used.
.IP "\s-1PERL5SHELL\s0 and tainting" 4
.IX Item "PERL5SHELL and tainting"
On Windows, the \s-1PERL5SHELL\s0 environment variable is now checked for
taintedness. (Rafael Garcia-Suarez)
.IP "Using *FILE{\s-1IO\s0}" 4
.IX Item "Using *FILE{IO}"
\&\f(CW\*(C`stat()\*(C'\fR and \f(CW\*(C`\-X\*(C'\fR filetests now treat *FILE{\s-1IO\s0} filehandles like *FILE
filehandles. (Steve Peters)
.IP "Overloading and reblessing" 4
.IX Item "Overloading and reblessing"
Overloading now works when references are reblessed into another class.
Internally, this has been implemented by moving the flag for \*(L"overloading\*(R"
from the reference to the referent, which logically is where it should
always have been. (Nicholas Clark)
.IP "Overloading and \s-1UTF\-8\s0" 4
.IX Item "Overloading and UTF-8"
A few bugs related to \s-1UTF\-8\s0 handling with objects that have
stringification overloaded have been fixed. (Nicholas Clark)
.IP "eval memory leaks fixed" 4
.IX Item "eval memory leaks fixed"
Traditionally, \f(CW\*(C`eval \*(Aqsyntax error\*(Aq\*(C'\fR has leaked badly. Many (but not all)
of these leaks have now been eliminated or reduced. (Dave Mitchell)
.IP "Random device on Windows" 4
.IX Item "Random device on Windows"
In previous versions, perl would read the file \fI/dev/urandom\fR if it
existed when seeding its random number generator.  That file is unlikely
to exist on Windows, and if it did would probably not contain appropriate
data, so perl no longer tries to read it on Windows. (Alex Davies)
.IP "\s-1PERLIO_DEBUG\s0" 4
.IX Item "PERLIO_DEBUG"
The \f(CW\*(C`PERLIO_DEBUG\*(C'\fR environment variable no longer has any effect for
setuid scripts and for scripts run with \fB\-T\fR.
.Sp
Moreover, with a thread-enabled perl, using \f(CW\*(C`PERLIO_DEBUG\*(C'\fR could lead to
an internal buffer overflow. This has been fixed.
.IP "PerlIO::scalar and read-only scalars" 4
.IX Item "PerlIO::scalar and read-only scalars"
PerlIO::scalar will now prevent writing to read-only scalars. Moreover,
\&\fIseek()\fR is now supported with PerlIO::scalar\-based filehandles, the
underlying string being zero-filled as needed. (Rafael, Jarkko Hietaniemi)
.IP "\fIstudy()\fR and \s-1UTF\-8\s0" 4
.IX Item "study() and UTF-8"
\&\fIstudy()\fR never worked for \s-1UTF\-8\s0 strings, but could lead to false results.
It's now a no-op on \s-1UTF\-8\s0 data. (Yves Orton)
.IP "Critical signals" 4
.IX Item "Critical signals"
The signals \s-1SIGILL\s0, \s-1SIGBUS\s0 and \s-1SIGSEGV\s0 are now always delivered in an
\&\*(L"unsafe\*(R" manner (contrary to other signals, that are deferred until the
perl interpreter reaches a reasonably stable state; see
\&\*(L"Deferred Signals (Safe Signals)\*(R" in perlipc). (Rafael)
.ie n .IP "@INC\-hook fix" 4
.el .IP "\f(CW@INC\fR\-hook fix" 4
.IX Item "@INC-hook fix"
When a module or a file is loaded through an \f(CW@INC\fR\-hook, and when this hook
has set a filename entry in \f(CW%INC\fR, _\|_FILE_\|_ is now set for this module
accordingly to the contents of that \f(CW%INC\fR entry. (Rafael)
.ie n .IP """\-t"" switch fix" 4
.el .IP "\f(CW\-t\fR switch fix" 4
.IX Item "-t switch fix"
The \f(CW\*(C`\-w\*(C'\fR and \f(CW\*(C`\-t\*(C'\fR switches can now be used together without messing
up which categories of warnings are activated. (Rafael)
.IP "Duping \s-1UTF\-8\s0 filehandles" 4
.IX Item "Duping UTF-8 filehandles"
Duping a filehandle which has the \f(CW\*(C`:utf8\*(C'\fR PerlIO layer set will now
properly carry that layer on the duped filehandle. (Rafael)
.IP "Localisation of hash elements" 4
.IX Item "Localisation of hash elements"
Localizing a hash element whose key was given as a variable didn't work
correctly if the variable was changed while the \fIlocal()\fR was in effect (as
in \f(CW\*(C`local $h{$x}; ++$x\*(C'\fR). (Bo Lindbergh)
.SH "New or Changed Diagnostics"
.IX Header "New or Changed Diagnostics"
.IP "Use of uninitialized value" 4
.IX Item "Use of uninitialized value"
Perl will now try to tell you the name of the variable (if any) that was
undefined.
.IP "Deprecated use of \fImy()\fR in false conditional" 4
.IX Item "Deprecated use of my() in false conditional"
A new deprecation warning, \fIDeprecated use of \fImy()\fI in false conditional\fR,
has been added, to warn against the use of the dubious and deprecated
construct
.Sp
.Vb 1
\&    my $x if 0;
.Ve
.Sp
See perldiag. Use \f(CW\*(C`state\*(C'\fR variables instead.
.IP "!=~ should be !~" 4
.IX Item "!=~ should be !~"
A new warning, \f(CW\*(C`!=~ should be !~\*(C'\fR, is emitted to prevent this misspelling
of the non-matching operator.
.IP "Newline in left-justified string" 4
.IX Item "Newline in left-justified string"
The warning \fINewline in left-justified string\fR has been removed.
.ie n .IP "Too late for ""\-T"" option" 4
.el .IP "Too late for ``\-T'' option" 4
.IX Item "Too late for -T option"
The error \fIToo late for \*(L"\-T\*(R" option\fR has been reformulated to be more
descriptive.
.ie n .IP """%s"" variable %s masks earlier declaration" 4
.el .IP "``%s'' variable \f(CW%s\fR masks earlier declaration" 4
.IX Item "%s variable %s masks earlier declaration"
This warning is now emitted in more consistent cases; in short, when one
of the declarations i