perlmodlib.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 "PERLMODLIB 1"
.TH PERLMODLIB 1 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
perlmodlib \- constructing new Perl modules and finding existing ones
.SH "THE PERL MODULE LIBRARY"
.IX Header "THE PERL MODULE LIBRARY"
Many modules are included in the Perl distribution.  These are described
below, and all end in \fI.pm\fR.  You may discover compiled library
files (usually ending in \fI.so\fR) or small pieces of modules to be
autoloaded (ending in \fI.al\fR); these were automatically generated
by the installation process.  You may also discover files in the
library directory that end in either \fI.pl\fR or \fI.ph\fR.  These are
old libraries supplied so that old programs that use them still
run.  The \fI.pl\fR files will all eventually be converted into standard
modules, and the \fI.ph\fR files made by \fBh2ph\fR will probably end up
as extension modules made by \fBh2xs\fR.  (Some \fI.ph\fR values may
already be available through the \s-1POSIX\s0, Errno, or Fcntl modules.)
The \fBpl2pm\fR file in the distribution may help in your conversion,
but it's just a mechanical process and therefore far from bulletproof.
.Sh "Pragmatic Modules"
.IX Subsection "Pragmatic Modules"
They work somewhat like compiler directives (pragmata) in that they
tend to affect the compilation of your program, and thus will usually
work well only when used within a \f(CW\*(C`use\*(C'\fR, or \f(CW\*(C`no\*(C'\fR.  Most of these
are lexically scoped, so an inner \s-1BLOCK\s0 may countermand them
by saying:
.PP
.Vb 3
\&    no integer;
\&    no strict \*(Aqrefs\*(Aq;
\&    no warnings;
.Ve
.PP
which lasts until the end of that \s-1BLOCK\s0.
.PP
Some pragmas are lexically scoped\*(--typically those that affect the
\&\f(CW$^H\fR hints variable.  Others affect the current package instead,
like \f(CW\*(C`use vars\*(C'\fR and \f(CW\*(C`use subs\*(C'\fR, which allow you to predeclare a
variables or subroutines within a particular \fIfile\fR rather than
just a block.  Such declarations are effective for the entire file
for which they were declared.  You cannot rescind them with \f(CW\*(C`no
vars\*(C'\fR or \f(CW\*(C`no subs\*(C'\fR.
.PP
The following pragmas are defined (and have their own documentation).
.IP "attributes" 12
.IX Item "attributes"
Get/set subroutine or variable attributes
.IP "attrs" 12
.IX Item "attrs"
Set/get attributes of a subroutine (deprecated)
.IP "autouse" 12
.IX Item "autouse"
Postpone load of modules until a function is used
.IP "base" 12
.IX Item "base"
Establish an \s-1ISA\s0 relationship with base classes at compile time
.IP "bigint" 12
.IX Item "bigint"
Transparent BigInteger support for Perl
.IP "bignum" 12
.IX Item "bignum"
Transparent BigNumber support for Perl
.IP "bigrat" 12
.IX Item "bigrat"
Transparent BigNumber/BigRational support for Perl
.IP "blib" 12
.IX Item "blib"
Use MakeMaker's uninstalled version of a package
.IP "bytes" 12
.IX Item "bytes"
Force byte semantics rather than character semantics
.IP "charnames" 12
.IX Item "charnames"
Define character names for \f(CW\*(C`\eN{named}\*(C'\fR string literal escapes
.IP "constant" 12
.IX Item "constant"
Declare constants
.IP "diagnostics" 12
.IX Item "diagnostics"
Produce verbose warning diagnostics
.IP "encoding" 12
.IX Item "encoding"
Allows you to write your script in non-ascii or non\-utf8
.IP "encoding::warnings" 12
.IX Item "encoding::warnings"
Warn on implicit encoding conversions
.IP "feature" 12
.IX Item "feature"
Enable new syntactic features
.IP "fields" 12
.IX Item "fields"
Compile-time class fields
.IP "filetest" 12
.IX Item "filetest"
Control the filetest permission operators
.IP "if" 12
.IX Item "if"
\&\f(CW\*(C`use\*(C'\fR a Perl module if a condition holds
.IP "integer" 12
.IX Item "integer"
Use integer arithmetic instead of floating point
.IP "less" 12
.IX Item "less"
Request less of something
.IP "lib" 12
.IX Item "lib"
Manipulate \f(CW@INC\fR at compile time
.IP "locale" 12
.IX Item "locale"
Use and avoid \s-1POSIX\s0 locales for built-in operations
.IP "mro" 12
.IX Item "mro"
Method Resolution Order
.IP "open" 12
.IX Item "open"
Set default PerlIO layers for input and output
.IP "ops" 12
.IX Item "ops"
Restrict unsafe operations when compiling
.IP "overload" 12
.IX Item "overload"
Package for overloading Perl operations
.IP "re" 12
.IX Item "re"
Alter regular expression behaviour
.IP "sigtrap" 12
.IX Item "sigtrap"
Enable simple signal handling
.IP "sort" 12
.IX Item "sort"
Control \fIsort()\fR behaviour
.IP "strict" 12
.IX Item "strict"
Restrict unsafe constructs
.IP "subs" 12
.IX Item "subs"
Predeclare sub names
.IP "threads" 12
.IX Item "threads"
Perl interpreter-based threads
.IP "threads::shared" 12
.IX Item "threads::shared"
Perl extension for sharing data structures between threads
.IP "utf8" 12
.IX Item "utf8"
Enable/disable \s-1UTF\-8\s0 (or UTF-EBCDIC) in source code
.IP "vars" 12
.IX Item "vars"
Predeclare global variable names (obsolete)
.IP "version" 12
.IX Item "version"
Perl extension for Version Objects
.IP "vmsish" 12
.IX Item "vmsish"
Control VMS-specific language features
.IP "warnings" 12
.IX Item "warnings"
Control optional warnings
.IP "warnings::register" 12
.IX Item "warnings::register"
Warnings import function
.Sh "Standard Modules"
.IX Subsection "Standard Modules"
Standard, bundled modules are all expected to behave in a well-defined
manner with respect to namespace pollution because they use the
Exporter module.  See their own documentation for details.
.PP
It's possible that not all modules listed below are installed on your
system. For example, the GDBM_File module will not be installed if you
don't have the gdbm library.
.IP "AnyDBM_File" 12
.IX Item "AnyDBM_File"
Provide framework for multiple DBMs
.IP "Archive::Extract" 12
.IX Item "Archive::Extract"
A generic archive extracting mechanism
.IP "Archive::Tar" 12
.IX Item "Archive::Tar"
Module for manipulations of tar archives
.IP "Archive::Tar::File" 12
.IX Item "Archive::Tar::File"
A subclass for in-memory extracted file from Archive::Tar
.IP "Attribute::Handlers" 12
.IX Item "Attribute::Handlers"
Simpler definition of attribute handlers
.IP "AutoLoader" 12
.IX Item "AutoLoader"
Load subroutines only on demand
.IP "AutoSplit" 12
.IX Item "AutoSplit"
Split a package for autoloading
.IP "B" 12
.IX Item "B"
The Perl Compiler
.IP "B::Concise" 12
.IX Item "B::Concise"
Walk Perl syntax tree, printing concise info about ops
.IP "B::Debug" 12
.IX Item "B::Debug"
Walk Perl syntax tree, printing debug info about ops
.IP "B::Deparse" 12
.IX Item "B::Deparse"
Perl compiler backend to produce perl code
.IP "B::Lint" 12
.IX Item "B::Lint"
Perl lint
.IP "B::Showlex" 12
.IX Item "B::Showlex"
Show lexical variables used in functions or files
.IP "B::Terse" 12
.IX Item "B::Terse"
Walk Perl syntax tree, printing terse info about ops
.IP "B::Xref" 12
.IX Item "B::Xref"
Generates cross reference reports for Perl programs
.IP "Benchmark" 12
.IX Item "Benchmark"
Benchmark running times of Perl code
.IP "\s-1CGI\s0" 12
.IX Item "CGI"
Simple Common Gateway Interface Class
.IP "CGI::Apache" 12
.IX Item "CGI::Apache"
Backward compatibility module for \s-1CGI\s0.pm
.IP "CGI::Carp" 12
.IX Item "CGI::Carp"
\&\s-1CGI\s0 routines for writing to the \s-1HTTPD\s0 (or other) error log
.IP "CGI::Cookie" 12
.IX Item "CGI::Cookie"
Interface to Netscape Cookies
.IP "CGI::Fast" 12
.IX Item "CGI::Fast"
\&\s-1CGI\s0 Interface for Fast \s-1CGI\s0
.IP "CGI::Pretty" 12
.IX Item "CGI::Pretty"
Module to produce nicely formatted \s-1HTML\s0 code
.IP "CGI::Push" 12
.IX Item "CGI::Push"
Simple Interface to Server Push
.IP "CGI::Switch" 12
.IX Item "CGI::Switch"
Backward compatibility module for defunct CGI::Switch
.IP "CGI::Util" 12
.IX Item "CGI::Util"
Internal utilities used by \s-1CGI\s0 module
.IP "\s-1CORE\s0" 12
.IX Item "CORE"
Pseudo-namespace for Perl's core routines
.IP "\s-1CPAN\s0" 12
.IX Item "CPAN"
Query, download and build perl modules from \s-1CPAN\s0 sites
.IP "\s-1CPAN::API::HOWTO\s0" 12
.IX Item "CPAN::API::HOWTO"
A recipe book for programming with \s-1CPAN\s0.pm
.IP "CPAN::FirstTime" 12
.IX Item "CPAN::FirstTime"
Utility for CPAN::Config file Initialization
.IP "CPAN::Kwalify" 12
.IX Item "CPAN::Kwalify"
Interface between \s-1CPAN\s0.pm and Kwalify.pm
.IP "CPAN::Nox" 12
.IX Item "CPAN::Nox"
Wrapper around \s-1CPAN\s0.pm without using any \s-1XS\s0 module
.IP "CPAN::Version" 12
.IX Item "CPAN::Version"
Utility functions to compare \s-1CPAN\s0 versions
.IP "\s-1CPANPLUS\s0" 12
.IX Item "CPANPLUS"