perl592delta.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.

.IX Subsection "suidperl less insecure"
Paul Szabo has analysed and patched \f(CW\*(C`suidperl\*(C'\fR to remove existing known
insecurities. Currently there are no known holes in \f(CW\*(C`suidperl\*(C'\fR, but previous
experience shows that we cannot be confident that these were the last. You may
no longer invoke the set uid perl directly, so to preserve backwards
compatibility with scripts that invoke #!/usr/bin/suidperl the only set uid
binary is now \f(CW\*(C`sperl5.9.\*(C'\fR\fIn\fR (\f(CW\*(C`sperl5.9.2\*(C'\fR for this release). \f(CW\*(C`suidperl\*(C'\fR
is installed as a hard link to \f(CW\*(C`perl\*(C'\fR; both \f(CW\*(C`suidperl\*(C'\fR and \f(CW\*(C`perl\*(C'\fR will
invoke \f(CW\*(C`sperl5.9.2\*(C'\fR automatically the set uid binary, so this change should
be completely transparent.
.PP
For new projects the core perl team would strongly recommend that you use
dedicated, single purpose security tools such as \f(CW\*(C`sudo\*(C'\fR in preference to
\&\f(CW\*(C`suidperl\*(C'\fR.
.Sh "\s-1PERLIO_DEBUG\s0"
.IX Subsection "PERLIO_DEBUG"
The \f(CW\*(C`PERLIO_DEBUG\*(C'\fR environment variable has no longer any effect for
setuid scripts and for scripts run with \fB\-T\fR.
.PP
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.
.Sh "Formats"
.IX Subsection "Formats"
In addition to bug fixes, \f(CW\*(C`format\*(C'\fR's features have been enhanced. See
perlform.
.Sh "Unicode Character Classes"
.IX Subsection "Unicode Character Classes"
Perl's regular expression engine now contains support for matching on the
intersection of two Unicode character classes. You can also now refer to
user-defined character classes from within other user defined character
classes.
.Sh "Byte-order modifiers for \fIpack()\fP and \fIunpack()\fP"
.IX Subsection "Byte-order modifiers for pack() and unpack()"
There are two new byte-order modifiers, \f(CW\*(C`>\*(C'\fR (big-endian) and \f(CW\*(C`<\*(C'\fR
(little-endian), that can be appended to most \fIpack()\fR and \fIunpack()\fR template
characters and groups to force a certain byte-order for that type or group.
See \*(L"pack\*(R" in perlfunc and perlpacktut for details.
.Sh "Byte count feature in \fIpack()\fP"
.IX Subsection "Byte count feature in pack()"
A new \fIpack()\fR template character, \f(CW"."\fR, returns the number of characters
read so far.
.Sh "New variables"
.IX Subsection "New variables"
A new variable, ${^RE_DEBUG_FLAGS}, controls what debug flags are in
effect for the regular expression engine when running under \f(CW\*(C`use re
"debug"\*(C'\fR. See re for details.
.PP
A new variable ${^UTF8LOCALE} indicates where an \s-1UTF\-8\s0 locale was detected
by perl at startup.
.SH "Modules and Pragmata"
.IX Header "Modules and Pragmata"
.Sh "New modules"
.IX Subsection "New modules"
.IP "\(bu" 4
\&\f(CW\*(C`encoding::warnings\*(C'\fR, by Audrey Tang, is a module to emit warnings
whenever an \s-1ASCII\s0 character string containing high-bit bytes is implicitly
converted into \s-1UTF\-8\s0.
.IP "\(bu" 4
\&\f(CW\*(C`Module::CoreList\*(C'\fR, by Richard Clamp, is a small handy module that tells
you what versions of core modules ship with any versions of Perl 5. It
comes with a command-line frontend, \f(CW\*(C`corelist\*(C'\fR.
.Sh "Updated And Improved Modules and Pragmata"
.IX Subsection "Updated And Improved Modules and Pragmata"
Dual-lived modules have been updated to be kept up-to-date with respect to
\&\s-1CPAN\s0.
.PP
The dual-lived modules which contain an \f(CW\*(C`_\*(C'\fR in their version number are
actually \fIahead\fR of the corresponding \s-1CPAN\s0 release.
.IP "B::Concise" 4
.IX Item "B::Concise"
\&\f(CW\*(C`B::Concise\*(C'\fR was significantly improved.
.IP "Socket" 4
.IX Item "Socket"
There is experimental support for Linux abstract Unix domain sockets.
.IP "Sys::Syslog" 4
.IX Item "Sys::Syslog"
\&\f(CW\*(C`syslog()\*(C'\fR can now use numeric constants for facility names and priorities,
in addition to strings.
.IP "threads" 4
.IX Item "threads"
Detached threads are now also supported on Windows.
.SH "Utility Changes"
.IX Header "Utility Changes"
.IP "\(bu" 4
The \f(CW\*(C`corelist\*(C'\fR utility is now installed with perl (see \*(L"New modules\*(R"
above).
.IP "\(bu" 4
\&\f(CW\*(C`h2ph\*(C'\fR and \f(CW\*(C`h2xs\*(C'\fR have been made a bit more robust with regard to
\&\*(L"modern\*(R" C code.
.IP "\(bu" 4
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 "\(bu" 4
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.
.Sp
Perl has a new \-dt command-line flag, which enables threads support in the
debugger.
.SH "Performance Enhancements"
.IX Header "Performance Enhancements"
.IP "\(bu" 4
Unicode case mappings (\f(CW\*(C`/i\*(C'\fR, \f(CW\*(C`lc\*(C'\fR, \f(CW\*(C`uc\*(C'\fR, etc) are faster.
.IP "\(bu" 4
\&\f(CW\*(C`@a = sort @a\*(C'\fR was optimized to do in-place sort. Likewise, \f(CW\*(C`reverse
sort ...\*(C'\fR is now optimized to sort in reverse, avoiding the generation of
a temporary intermediate list.
.IP "\(bu" 4
Unnecessary assignments are optimised away in
.Sp
.Vb 3
\&  my $s = undef;
\&  my @a = ();
\&  my %h = ();
.Ve
.IP "\(bu" 4
\&\f(CW\*(C`map\*(C'\fR in scalar context is now optimized.
.IP "\(bu" 4
The regexp engine now implements the trie optimization : it's able to
factorize common prefixes and suffixes in regular expressions. A new
special variable, ${^RE_TRIE_MAXBUF}, has been added to fine-tune this
optimization.
.SH "Installation and Configuration Improvements"
.IX Header "Installation and Configuration Improvements"
Run-time customization of \f(CW@INC\fR can be enabled by passing the
\&\f(CW\*(C`\-Dusesitecustomize\*(C'\fR flag to configure. When enabled, this will make perl
run \fI\f(CI$sitelibexp\fI/sitecustomize.pl\fR before anything else.  This script can
then be set up to add additional entries to \f(CW@INC\fR.
.PP
There is alpha support for relocatable \f(CW@INC\fR entries.
.PP
Perl should build on Interix and on GNU/kFreeBSD.
.SH "Selected Bug Fixes"
.IX Header "Selected Bug Fixes"
Most of those bugs were reported in the perl 5.8.x maintenance track.
Notably, quite a few utf8 bugs were fixed, and several memory leaks were
suppressed. The perl58Xdelta manpages have more details on them.
.PP
Development-only bug fixes include :
.PP
\&\f(CW$Foo::_\fR was wrongly forced as \f(CW$main::_\fR.
.SH "New or Changed Diagnostics"
.IX Header "New or Changed Diagnostics"
A new warning, \f(CW\*(C`!=~ should be !~\*(C'\fR, is emitted to prevent this misspelling
of the non-matching operator.
.PP
The warning \fINewline in left-justified string\fR has been removed.
.PP
The error \fIToo late for \*(L"\-T\*(R" option\fR has been reformulated to be more
descriptive.
.PP
There is a new compilation error, \fIIllegal declaration of subroutine\fR,
for an obscure case of syntax errors.
.PP
The diagnostic output of Carp has been changed slightly, to add a space after
the comma between arguments. This makes it much easier for tools such as
web browsers to wrap it, but might confuse any automatic tools which perform
detailed parsing of Carp output.
.PP
\&\f(CW\*(C`perl \-V\*(C'\fR has several improvements, making it more useable from shell
scripts to get the value of configuration variables. See perlrun for
details.
.SH "Changed Internals"
.IX Header "Changed Internals"
The perl core has been refactored and reorganised in several places.
In short, this release will not be binary compatible with any previous
perl release.
.SH "Known Problems"
.IX Header "Known Problems"
For threaded builds, \fIext/threads/shared/t/wait.t\fR has been reported to
fail some tests on HP-UX 10.20.
.PP
Net::Ping might fail some tests on HP-UX 11.00 with the latest \s-1OS\s0
upgrades.
.PP
\&\fIt/io/dup.t\fR, \fIt/io/open.t\fR and \fIlib/ExtUtils/t/Constant.t\fR fail some
tests on some \s-1BSD\s0 flavours.
.SH "Plans for the next release"
.IX Header "Plans for the next release"
The current plan for perl 5.9.3 is to add \s-1CPANPLUS\s0 as a core module.
More regular expression optimizations are also in the works.
.PP
It is planned to release a development version of perl more frequently,
i.e. each time something major changes.
.SH "Reporting Bugs"
.IX Header "Reporting Bugs"
If you find what you think is a bug, you might check the articles
recently posted to the comp.lang.perl.misc newsgroup and the perl
bug database at http://bugs.perl.org/ .  There may also be
information at http://www.perl.org/ , the Perl Home Page.
.PP
If you believe you have an unreported bug, please run the \fBperlbug\fR
program included with your release.  Be sure to trim your bug down
to a tiny but sufficient test case.  Your bug report, along with the
output of \f(CW\*(C`perl \-V\*(C'\fR, will be sent off to [e-mail] to be
analysed by the Perl porting team.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
The \fIChanges\fR file for exhaustive details on what changed.
.PP
The \fI\s-1INSTALL\s0\fR file for how to build Perl.
.PP
The \fI\s-1README\s0\fR file for general stuff.
.PP
The \fIArtistic\fR and \fICopying\fR files for copyright information.