perl561delta.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 "PERL561DELTA 1"
.TH PERL561DELTA 1 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
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.SH "NAME"
perl561delta \- what's new for perl v5.6.x
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This document describes differences between the 5.005 release and the 5.6.1
release.
.SH "Summary of changes between 5.6.0 and 5.6.1"
.IX Header "Summary of changes between 5.6.0 and 5.6.1"
This section contains a summary of the changes between the 5.6.0 release
and the 5.6.1 release.  More details about the changes mentioned here
may be found in the \fIChanges\fR files that accompany the Perl source
distribution.  See perlhack for pointers to online resources where you
can inspect the individual patches described by these changes.
.Sh "Security Issues"
.IX Subsection "Security Issues"
suidperl will not run /bin/mail anymore, because some platforms have
a /bin/mail that is vulnerable to buffer overflow attacks.
.PP
Note that suidperl is neither built nor installed by default in
any recent version of perl.  Use of suidperl is highly discouraged.
If you think you need it, try alternatives such as sudo first.
See http://www.courtesan.com/sudo/ .
.Sh "Core bug fixes"
.IX Subsection "Core bug fixes"
This is not an exhaustive list.  It is intended to cover only the
significant user-visible changes.
.ie n .IP """UNIVERSAL::isa()""" 4
.el .IP "\f(CWUNIVERSAL::isa()\fR" 4
.IX Item "UNIVERSAL::isa()"
A bug in the caching mechanism used by \f(CW\*(C`UNIVERSAL::isa()\*(C'\fR that affected
base.pm has been fixed.  The bug has existed since the 5.005 releases,
but wasn't tickled by base.pm in those releases.
.IP "Memory leaks" 4
.IX Item "Memory leaks"
Various cases of memory leaks and attempts to access uninitialized memory
have been cured.  See \*(L"Known Problems\*(R" below for further issues.
.IP "Numeric conversions" 4
.IX Item "Numeric conversions"
Numeric conversions did not recognize changes in the string value
properly in certain circumstances.
.Sp
In other situations, large unsigned numbers (those above 2**31) could
sometimes lose their unsignedness, causing bogus results in arithmetic
operations.
.Sp
Integer modulus on large unsigned integers sometimes returned
incorrect values.
.Sp
Perl 5.6.0 generated \*(L"not a number\*(R" warnings on certain conversions where
previous versions didn't.
.Sp
These problems have all been rectified.
.Sp
Infinity is now recognized as a number.
.IP "qw(a\e\eb)" 4
.IX Item "qw(ab)"
In Perl 5.6.0, qw(a\e\eb) produced a string with two backslashes instead
of one, in a departure from the behavior in previous versions.  The
older behavior has been reinstated.
.IP "\fIcaller()\fR" 4
.IX Item "caller()"
\&\fIcaller()\fR could cause core dumps in certain situations.  Carp was sometimes
affected by this problem.
.IP "Bugs in regular expressions" 4
.IX Item "Bugs in regular expressions"
Pattern matches on overloaded values are now handled correctly.
.Sp
Perl 5.6.0 parsed m/\ex{ab}/ incorrectly, leading to spurious warnings.
This has been corrected.
.Sp
The \s-1RE\s0 engine found in Perl 5.6.0 accidentally pessimised certain kinds
of simple pattern matches.  These are now handled better.
.Sp
Regular expression debug output (whether through \f(CW\*(C`use re \*(Aqdebug\*(Aq\*(C'\fR
or via \f(CW\*(C`\-Dr\*(C'\fR) now looks better.
.Sp
Multi-line matches like \f(CW\*(C`"a\enxb\en" =~ /(?!\eA)x/m\*(C'\fR were flawed.  The
bug has been fixed.
.Sp
Use of $& could trigger a core dump under some situations.  This
is now avoided.
.Sp
Match variables \f(CW$1\fR et al., weren't being unset when a pattern match
was backtracking, and the anomaly showed up inside \f(CW\*(C`/...(?{ ... }).../\*(C'\fR
etc.  These variables are now tracked correctly.
.Sp
\&\fIpos()\fR did not return the correct value within s///ge in earlier
versions.  This is now handled correctly.
.ie n .IP """slurp"" mode" 4
.el .IP "``slurp'' mode" 4
.IX Item "slurp mode"
\&\fIreadline()\fR on files opened in \*(L"slurp\*(R" mode could return an extra "" at
the end in certain situations.  This has been corrected.
.IP "Autovivification of symbolic references to special variables" 4
.IX Item "Autovivification of symbolic references to special variables"
Autovivification of symbolic references of special variables described
in perlvar (as in \f(CW\*(C`${$num}\*(C'\fR) was accidentally disabled.  This works
again now.
.IP "Lexical warnings" 4
.IX Item "Lexical warnings"
Lexical warnings now propagate correctly into \f(CW\*(C`eval "..."\*(C'\fR.
.Sp
\&\f(CW\*(C`use warnings qw(FATAL all)\*(C'\fR did not work as intended.  This has been
corrected.
.Sp
Lexical warnings could leak into other scopes in some situations.
This is now fixed.
.Sp
\&\fIwarnings::enabled()\fR now reports the state of $^W correctly if the caller
isn't using lexical warnings.
.IP "Spurious warnings and errors" 4
.IX Item "Spurious warnings and errors"
Perl 5.6.0 could emit spurious warnings about redefinition of \fIdl_error()\fR
when statically building extensions into perl.  This has been corrected.
.Sp
\&\*(L"our\*(R" variables could result in bogus \*(L"Variable will not stay shared\*(R"
warnings.  This is now fixed.
.Sp
\&\*(L"our\*(R" variables of the same name declared in two sibling blocks
resulted in bogus warnings about \*(L"redeclaration\*(R" of the variables.
The problem has been corrected.
.IP "\fIglob()\fR" 4
.IX Item "glob()"
Compatibility of the builtin \fIglob()\fR with old csh-based glob has been
improved with the addition of \s-1GLOB_ALPHASORT\s0 option.  See \f(CW\*(C`File::Glob\*(C'\fR.
.Sp
\&\fIFile::Glob::glob()\fR has been renamed to \fIFile::Glob::bsd_glob()\fR
because the name clashes with the builtin \fIglob()\fR.  The older
name is still available for compatibility, but is deprecated.
.Sp
Spurious syntax errors generated in certain situations, when \fIglob()\fR
caused File::Glob to be loaded for the first time, have been fixed.
.IP "Tainting" 4
.IX Item "Tainting"
Some cases of inconsistent taint propagation (such as within hash
values) have been fixed.
.Sp
The tainting behavior of \fIsprintf()\fR has been rationalized.  It does
not taint the result of floating point formats anymore, making the
behavior consistent with that of string interpolation.
.IP "\fIsort()\fR" 4
.IX Item "sort()"
Arguments to \fIsort()\fR weren't being provided the right \fIwantarray()\fR context.
The comparison block is now run in scalar context, and the arguments to
be sorted are always provided list context.
.Sp
\&\fIsort()\fR is also fully reentrant, in the sense that the sort function
can itself call \fIsort()\fR.  This did not work reliably in previous releases.
.IP "#line directives" 4
.IX Item "#line directives"
#line directives now work correctly when they appear at the very
beginning of \f(CW\*(C`eval "..."\*(C'\fR.
.IP "Subroutine prototypes" 4
.IX Item "Subroutine prototypes"
The (\e&) prototype now works properly.
.IP "\fImap()\fR" 4
.IX Item "map()"
\&\fImap()\fR could get pathologically slow when the result list it generates
is larger than the source list.  The performance has been improved for
common scenarios.