=head1 Supported Environments
-Perl5.004 builds out of the box on Unix, Plan9, LynxOS, VMS, OS/2,
-QNX, and AmigaOS.
+Perl5.004 builds out of the box on Unix, Plan 9, LynxOS, VMS, OS/2,
+QNX, AmigaOS, and Windows NT. Perl runs on Windows 95 as well, but it
+cannot be built there, for lack of a reasonable command interpreter.
=head1 Core Changes
-Most importantly, many bugs were fixed. See the F<Changes>
-file in the distribution for details.
+Most importantly, many bugs were fixed, including several security
+problems. See the F<Changes> file in the distribution for details.
-=head2 Compilation Option: Binary Compatibility With 5.003
+=head2 List assignment to %ENV works
+
+C<%ENV = ()> and C<%ENV = @list> now work as expected (except on VMS
+where it generates a fatal error).
+
+=head2 "Can't locate Foo.pm in @INC" error now lists @INC
+
+=head2 Compilation option: Binary compatibility with 5.003
There is a new Configure question that asks if you want to maintain
binary compatibility with Perl 5.003. If you choose binary
just as in the 5.003 release. By default, binary compatibility
is preserved at the expense of symbol table pollution.
-=head2 No Autovivification of Subroutine Parameters
+=head2 $PERL5OPT environment variable
+
+You may now put Perl options in the $PERL5OPT environment variable.
+Unless Perl is running with taint checks, it will interpret this
+variable as if its contents had appeared on a "#!perl" line at the
+beginning of your script, except that hyphens are optional. PERL5OPT
+may only be used to set the following switches: B<-[DIMUdmw]>.
+
+=head2 Limitations on B<-M>, B<-m>, and B<-T> options
+
+The C<-M> and C<-m> options are no longer allowed on the C<#!> line of
+a script. If a script needs a module, it should invoke it with the
+C<use> pragma.
+
+The B<-T> option is also forbidden on the C<#!> line of a script,
+unless it was present on the Perl command line. Due to the way C<#!>
+works, this usually means that B<-T> must be in the first argument.
+Thus:
+
+ #!/usr/bin/perl -T -w
+
+will probably work for an executable script invoked as C<scriptname>,
+while:
+
+ #!/usr/bin/perl -w -T
+
+will probably fail under the same conditions. (Non-Unix systems will
+probably not follow this rule.) But C<perl scriptname> is guaranteed
+to fail, since then there is no chance of B<-T> being found on the
+command line before it is found on the C<#!> line.
+
+=head2 More precise warnings
+
+If you removed the B<-w> option from your Perl 5.003 scripts because it
+made Perl too verbose, we recommend that you try putting it back when
+you upgrade to Perl 5.004. Each new perl version tends to remove some
+undesirable warnings, while adding new warnings that may catch bugs in
+your scripts.
+
+=head2 Deprecated: Inherited C<AUTOLOAD> for non-methods
+
+Before Perl 5.004, C<AUTOLOAD> functions were looked up as methods
+(using the C<@ISA> hierarchy), even when the function to be autoloaded
+was called as a plain function (e.g. C<Foo::bar()>), not a method
+(e.g. C<Foo-E<gt>bar()> or C<$obj-E<gt>bar()>).
-In Perl versions 5.002 and 5.003, array and hash elements used as
-subroutine parameters were "autovivified"; that is, they were brought
-into existence if they did not already exist. For example, calling
-C<func($h{foo})> would create C<$h{foo}> if it did not already exist,
-causing C<exists $h{foo}> to become true and C<keys %h> to return
-C<('foo')>.
+Perl 5.005 will use method lookup only for methods' C<AUTOLOAD>s.
+However, there is a significant base of existing code that may be using
+the old behavior. So, as an interim step, Perl 5.004 issues an optional
+warning when a non-method uses an inherited C<AUTOLOAD>.
-Perl 5.004 returns to the pre-5.002 behavior of I<not> autovivifying
-array and hash elements used as subroutine parameters.
+The simple rule is: Inheritance will not work when autoloading
+non-methods. The simple fix for old code is: In any module that used to
+depend on inheriting C<AUTOLOAD> for non-methods from a base class named
+C<BaseClass>, execute C<*AUTOLOAD = \&BaseClass::AUTOLOAD> during startup.
-=head2 Fixed Parsing of $$<digit>, &$<digit>, etc.
+=head2 Previously deprecated %OVERLOAD is no longer usable
-A bug in previous versions of Perl 5.0 prevented proper parsing of
-numeric special variables as symbolic references. That bug has been
-fixed. As a result, the string "$$0" is no longer equivalent to
-C<$$."0">, but rather to C<${$0}>. To get the old behavior, change
-"$$" followed by a digit to "${$}".
+Using %OVERLOAD to define overloading was deprecated in 5.003.
+Overloading is now defined using the overload pragma. %OVERLOAD is
+still used internally but should not be used by Perl scripts. See
+L<overload> for more details.
-=head2 No Resetting of $. on Implicit Close
+=head2 Subroutine arguments created only when they're modified
+
+In Perl 5.004, nonexistent array and hash elements used as subroutine
+parameters are brought into existence only if they are actually
+assigned to (via C<@_>).
+
+Earlier versions of Perl vary in their handling of such arguments.
+Perl versions 5.002 and 5.003 always brought them into existence.
+Perl versions 5.000 and 5.001 brought them into existence only if
+they were not the first argument (which was almost certainly a bug).
+Earlier versions of Perl never brought them into existence.
+
+For example, given this code:
+
+ undef @a; undef %a;
+ sub show { print $_[0] };
+ sub change { $_[0]++ };
+ show($a[2]);
+ change($a{b});
+
+After this code executes in Perl 5.004, $a{b} exists but $a[2] does
+not. In Perl 5.002 and 5.003, both $a{b} and $a[2] would have existed
+(but $a[2]'s value would have been undefined).
+
+=head2 Group vector changeable with C<$)>
+
+The C<$)> special variable has always (well, in Perl 5, at least)
+reflected not only the current effective group, but also the group list
+as returned by the C<getgroups()> C function (if there is one).
+However, until this release, there has not been a way to call the
+C<setgroups()> C function from Perl.
+
+In Perl 5.004, assigning to C<$)> is exactly symmetrical with examining
+it: The first number in its string value is used as the effective gid;
+if there are any numbers after the first one, they are passed to the
+C<setgroups()> C function (if there is one).
+
+=head2 Fixed parsing of $$<digit>, &$<digit>, etc.
+
+Perl versions before 5.004 misinterpreted any type marker followed by
+"$" and a digit. For example, "$$0" was incorrectly taken to mean
+"${$}0" instead of "${$0}". This bug is (mostly) fixed in Perl 5.004.
+
+However, the developers of Perl 5.004 could not fix this bug completely,
+because at least two widely-used modules depend on the old meaning of
+"$$0" in a string. So Perl 5.004 still interprets "$$<digit>" in the
+old (broken) way inside strings; but it generates this message as a
+warning. And in Perl 5.005, this special treatment will cease.
+
+=head2 No resetting of $. on implicit close
The documentation for Perl 5.0 has always stated that C<$.> is I<not>
-reset when an already-open file handle is re-opened with no intervening
-call to C<close>. Due to a bug, perl versions 5.000 through 5.0003
+reset when an already-open file handle is reopened with no intervening
+call to C<close>. Due to a bug, perl versions 5.000 through 5.003
I<did> reset C<$.> under that circumstance; Perl 5.004 does not.
-=head2 Changes to Tainting Checks
+=head2 C<wantarray> may return undef
+
+The C<wantarray> operator returns true if a subroutine is expected to
+return a list, and false otherwise. In Perl 5.004, C<wantarray> can
+also return the undefined value if a subroutine's return value will
+not be used at all, which allows subroutines to avoid a time-consuming
+calculation of a return value if it isn't going to be used.
+
+=head2 Changes to tainting checks
A bug in previous versions may have failed to detect some insecure
-conditions when taint checks are turned on. (Taint checks are used
+conditions when taint checks are turned on. (Taint checks are used
in setuid or setgid scripts, or when explicitly turned on with the
-C<-T> invocation option.) Although it's unlikely, this may cause a
+C<-T> invocation option.) Although it's unlikely, this may cause a
previously-working script to now fail -- which should be construed
as a blessing, since that indicates a potentially-serious security
hole was just plugged.
-=head2 New Opcode Module and Revised Safe Module
+The new restrictions when tainting include:
+
+=over
+
+=item No glob() or <*>
+
+These operators may spawn the C shell (csh), which cannot be made
+safe. This restriction will be lifted in a future version of Perl
+when globbing is implemented without the use of an external program.
+
+=item No spawning if tainted $CDPATH, $ENV, $BASH_ENV
+
+These environment variables may alter the behavior of spawned programs
+(especially shells) in ways that subvert security. So now they are
+treated as dangerous, in the manner of $IFS and $PATH.
+
+=item No spawning if tainted $TERM doesn't look like a terminal name
+
+Some termcap libraries do unsafe things with $TERM. However, it would be
+unnecessarily harsh to treat all $TERM values as unsafe, since only shell
+metacharacters can cause trouble in $TERM. So a tainted $TERM is
+considered to be safe if it contains only alphanumerics, underscores,
+dashes, and colons, and unsafe if it contains other characters (including
+whitespace).
+
+=back
+
+=head2 New Opcode module and revised Safe module
A new Opcode module supports the creation, manipulation and
application of opcode masks. The revised Safe module has a new API
and is implemented using the new Opcode module. Please read the new
Opcode and Safe documentation.
-=head2 Embedding Improvements
+=head2 Embedding improvements
In older versions of Perl it was not possible to create more than one
Perl interpreter instance inside a single process without leaking like a
program. See the updated perlembed manpage for tips on how to manage
your interpreters.
-=head2 Internal Change: FileHandle Class Based on IO::* Classes
+=head2 Internal change: FileHandle class based on IO::* classes
File handles are now stored internally as type IO::Handle. The
FileHandle module is still supported for backwards compatibility, but
IO::Handle, IO::Seekable, and IO::File. We suggest, but do not
require, that you use the IO::* modules in new code.
-In harmony with this change, C<*GLOB{FILEHANDLE}> is now a
-backward-compatible synonym for C<*STDOUT{IO}>.
+In harmony with this change, C<*GLOB{FILEHANDLE}> is now just a
+backward-compatible synonym for C<*GLOB{IO}>.
-=head2 Internal Change: PerlIO internal IO abstraction interface
+=head2 Internal change: PerlIO abstraction interface
It is now possible to build Perl with AT&T's sfio IO package
instead of stdio. See L<perlapio> for more details, and
the F<INSTALL> file for how to use it.
-=head2 New and Changed Built-in Variables
+=head2 New and changed syntax
+
+=over
+
+=item $coderef->(PARAMS)
+
+A subroutine reference may now be suffixed with an arrow and a
+(possibly empty) parameter list. This syntax denotes a call of the
+referenced subroutine, with the given parameters (if any).
+
+This new syntax follows the pattern of S<C<$hashref-E<gt>{FOO}>> and
+S<C<$aryref-E<gt>[$foo]>>: You may now write S<C<&$subref($foo)>> as
+S<C<$subref-E<gt>($foo)>>. All of these arrow terms may be chained;
+thus, S<C<&{$table-E<gt>{FOO}}($bar)>> may now be written
+S<C<$table-E<gt>{FOO}-E<gt>($bar)>>.
+
+=back
+
+=head2 New and changed builtin constants
+
+=over
+
+=item __PACKAGE__
+
+The current package name at compile time, or the undefined value if
+there is no current package (due to a C<package;> directive). Like
+C<__FILE__> and C<__LINE__>, C<__PACKAGE__> does I<not> interpolate
+into strings.
+
+=back
+
+=head2 New and changed builtin variables
=over
=back
-=head2 New and Changed Built-in Functions
+=head2 New and changed builtin functions
=over
=item printf and sprintf
-now support "%i" as a synonym for "%d", and the "h" modifier.
-So "%hi" means "short integer in decimal", and "%ho" means
-"unsigned short integer as octal".
+Perl now implements these functions itself; it doesn't use the C
+library function sprintf() any more, except for floating-point
+numbers, and even then only known flags are allowed. As a result, it
+is now possible to know which conversions and flags will work, and
+what they will do.
+
+The new conversions in Perl's sprintf() are:
+
+ %i a synonym for %d
+ %p a pointer (the address of the Perl value, in hexadecimal)
+ %n special: *stores* the number of characters output so far
+ into the next variable in the parameter list
+
+The new flags that go between the C<%> and the conversion are:
+
+ # prefix octal with "0", hex with "0x"
+ h interpret integer as C type "short" or "unsigned short"
+ V interpret integer as Perl's standard integer type
+
+Also, where a number would appear in the flags, an asterisk ("*") may
+be used instead, in which case Perl uses the next item in the
+parameter list as the given number (that is, as the field width or
+precision). If a field width obtained through "*" is negative, it has
+the same effect as the '-' flag: left-justification.
+
+See L<perlfunc/sprintf> for a complete list of conversion and flags.
=item keys as an lvalue
Note that you still cannot use my() on global punctuation variables
such as $_ and the like.
-=item unpack() and pack()
+=item pack() and unpack()
A new format 'w' represents a BER compressed integer (as defined in
ASN.1). Its format is a sequence of one or more bytes, each of which
first. Bit eight of each byte is set, except for the last byte, in
which bit eight is clear.
+Both pack() and unpack() now fail when their templates contain invalid
+types. (Invalid types used to be ignored.)
+
+=item sysseek()
+
+The new sysseek() operator is a variant of seek() that sets and gets the
+file's system read/write position, using the lseek(2) system call. It is
+the only reliable way to seek before using sysread() or syswrite(). Its
+return value is the new position, or the undefined value on failure.
+
=item use VERSION
If the first argument to C<use> is a number, it is treated as a version
is less than VERSION, then an error message is printed and Perl exits
immediately. Because C<use> occurs at compile time, this check happens
immediately during the compilation process, unlike C<require VERSION>,
-which waits until run-time for the check. This is often useful if you
+which waits until runtime for the check. This is often useful if you
need to check the current Perl version before C<use>ing library modules
which have changed in incompatible ways from older versions of Perl.
(We try not to do this more than we have to.)
If the VERSION argument is present between Module and LIST, then the
C<use> will call the VERSION method in class Module with the given
version as an argument. The default VERSION method, inherited from
-the Universal class, croaks if the given version is larger than the
+the UNIVERSAL class, croaks if the given version is larger than the
value of the variable $Module::VERSION. (Note that there is not a
comma after VERSION!)
Functions documented in the Camel to default to $_ now in
fact do, and all those that do are so documented in L<perlfunc>.
-=item C<m//g> does not trigger a pos() reset on failure
+=item C<m//gc> does not reset search position on failure
-The C<m//g> match iteration construct used to reset the iteration
-when it failed to match (so that the next C<m//g> match would start at
-the beginning of the string). You now have to explicitly do a
-C<pos $str = 0;> to reset the "last match" position, or modify the
-string in some way. This change makes it practical to chain C<m//g>
-matches together in conjunction with ordinary matches using the C<\G>
-zero-width assertion. See L<perlop> and L<perlre>.
+The C<m//g> match iteration construct has always reset its target
+string's search position (which is visible through the C<pos> operator)
+when a match fails; as a result, the next C<m//g> match after a failure
+starts again at the beginning of the string. With Perl 5.004, this
+reset may be disabled by adding the "c" (for "continue") modifier,
+i.e. C<m//gc>. This feature, in conjunction with the C<\G> zero-width
+assertion, makes it possible to chain matches together. See L<perlop>
+and L<perlre>.
+
+=item C<m//x> ignores whitespace before ?*+{}
+
+The C<m//x> construct has always been intended to ignore all unescaped
+whitespace. However, before Perl 5.004, whitespace had the effect of
+escaping repeat modifiers like "*" or "?"; for example, C</a *b/x> was
+(mis)interpreted as C</a\*b/x>. This bug has been fixed in 5.004.
=item nested C<sub{}> closures work now
Just like anonymous functions that contain lexical variables
that change (like a lexical index variable for a C<foreach> loop),
formats now work properly. For example, this silently failed
-before, and is fine now:
+before (printed only zeros), but is fine now:
my $i;
foreach $i ( 1 .. 10 ) {
- format =
+ write;
+ }
+ format =
my i is @#
$i
.
- write;
- }
=back
-=head2 New Built-in Methods
+=head2 New builtin methods
The C<UNIVERSAL> package automatically contains the following methods that
are inherited by all other classes:
available to your program. This is necessary only if you wish to
have C<isa> available as a plain subroutine in the current package.
-=head2 TIEHANDLE Now Supported
+=head2 TIEHANDLE now supported
See L<perltie> for other kinds of tie()s.
return print join( $, => map {uc} @_), $\;
}
+=item PRINTF this, LIST
+
+This method will be triggered every time the tied handle is printed to
+with the C<printf()> function.
+Beyond its self reference it also expects the format and list that was
+passed to the printf function.
+
+ sub PRINTF {
+ shift;
+ my $fmt = shift;
+ print sprintf($fmt, @_)."\n";
+ }
+
=item READ this LIST
This method will be called when the handle is read from via the C<read>
=back
-=head2 Malloc Enhancements
+=head2 Malloc enhancements
Four new compilation flags are recognized by malloc.c. (They have no
effect if perl is compiled with system malloc().)
=back
-=head2 Miscellaneous Efficiency Enhancements
+=head2 Miscellaneous efficiency enhancements
Functions that have an empty prototype and that do nothing but return
a fixed value are now inlined (e.g. C<sub PI () { 3.14159 }>).
have an entry with that key. So even if you have 100 copies of the
same hash, the hash keys never have to be reallocated.
+=head1 Support for More Operating Systems
+
+Support for the following operating systems is new in Perl 5.004.
+
+=head2 Win32
+
+Perl 5.004 now includes support for building a "native" perl under
+Windows NT, using the Microsoft Visual C++ compiler (versions 2.0
+and above) or the Borland C++ compiler (versions 5.02 and above).
+The resulting perl can be used under Windows 95 (if it
+is installed in the same directory locations as it got installed
+in Windows NT). This port includes support for perl extension
+building tools like L<MakeMaker> and L<h2xs>, so that many extensions
+available on the Comprehensive Perl Archive Network (CPAN) can now be
+readily built under Windows NT. See http://www.perl.com/ for more
+information on CPAN, and L<README.win32> for more details on how to
+get started with building this port.
+
+There is also support for building perl under the Cygwin32 environment.
+Cygwin32 is a set of GNU tools that make it possible to compile and run
+many UNIX programs under Windows NT by providing a mostly UNIX-like
+interface for compilation and execution. See L<README.cygwin32> for
+more details on this port, and how to obtain the Cygwin32 toolkit.
+
+=head2 Plan 9
+
+See L<README.plan9>.
+
+=head2 QNX
+
+See L<README.qnx>.
+
+=head2 AmigaOS
+
+See L<README.amigaos>.
+
=head1 Pragmata
-Four new pragmatic modules exist:
+Six new pragmatic modules exist:
=over
+=item use autouse MODULE => qw(sub1 sub2 sub3)
+
+Defers C<require MODULE> until someone calls one of the specified
+subroutines (which must be exported by MODULE). This pragma should be
+used with caution, and only when necessary.
+
=item use blib
=item use blib 'dir'
Intended for use on command line with B<-M> option as a way of testing
arbitrary scripts against an uninstalled version of a package.
+=item use constant NAME => VALUE
+
+Provides a convenient interface for creating compile-time constants,
+See L<perlsub/"Constant Functions">.
+
=item use locale
Tells the compiler to enable (or disable) the use of POSIX locales for
-built-in operations.
+builtin operations.
When C<use locale> is in effect, the current LC_CTYPE locale is used
for regular expressions and case mapping; LC_COLLATE for string
=head1 Modules
-=head2 Installation Directories
+=head2 Required Updates
+
+Though Perl 5.004 is compatible with almost all modules that work
+with Perl 5.003, there are a few exceptions:
+
+ Module Required Version for Perl 5.004
+ ------ -------------------------------
+ Filter Filter-1.12
+ LWP libwww-perl-5.08
+ Tk Tk400.202 (-w makes noise)
+
+Also, the majordomo mailing list program, version 1.94.1, doesn't work
+with Perl 5.004 (nor with perl 4), because it executes an invalid
+regular expression. This bug is fixed in majordomo version 1.94.2.
+
+=head2 Installation directories
The I<installperl> script now places the Perl source files for
extensions in the architecture-specific library directory, which is
the risk of binary incompatibility between extensions' Perl source and
shared libraries.
-=head2 Fcntl
-
-New constants in the existing Fcntl modules are now supported,
-provided that your operating system happens to support them:
-
- F_GETOWN F_SETOWN
- O_ASYNC O_DEFER O_DSYNC O_FSYNC O_SYNC
- O_EXLOCK O_SHLOCK
-
-These constants are intended for use with the Perl operators sysopen()
-and fcntl() and the basic database modules like SDBM_File. For the
-exact meaning of these and other Fcntl constants please refer to your
-operating system's documentation for fcntl() and open().
-
-In addition, the Fcntl module now provides these constants for use
-with the Perl operator flock():
-
- LOCK_SH LOCK_EX LOCK_NB LOCK_UN
-
-These constants are defined in all environments (because where there is
-no flock() system call, Perl emulates it). However, for historical
-reasons, these constants are not exported unless they are explicitly
-requested with the ":flock" tag (e.g. C<use Fcntl ':flock'>).
-
-=head2 Module Information Summary
+=head2 Module information summary
Brand new modules, arranged by topic rather than strictly
alphabetically:
- CPAN interface to Comprehensive Perl Archive Network
- CPAN::FirstTime create a CPAN configuration file
- CPAN::Nox run CPAN while avoiding compiled extensions
+ CGI.pm Web server interface ("Common Gateway Interface")
+ CGI/Apache.pm Support for Apache's Perl module
+ CGI/Carp.pm Log server errors with helpful context
+ CGI/Fast.pm Support for FastCGI (persistent server process)
+ CGI/Push.pm Support for server push
+ CGI/Switch.pm Simple interface for multiple server types
+
+ CPAN Interface to Comprehensive Perl Archive Network
+ CPAN::FirstTime Utility for creating CPAN configuration file
+ CPAN::Nox Runs CPAN while avoiding compiled extensions
IO.pm Top-level interface to IO::* classes
IO/File.pm IO::File extension Perl module
FindBin.pm Find path of currently executing program
- Class/Template.pm Structure/member template builder
- File/stat.pm Object-oriented wrapper around CORE::stat
- Net/hostent.pm Object-oriented wrapper around CORE::gethost*
- Net/netent.pm Object-oriented wrapper around CORE::getnet*
- Net/protoent.pm Object-oriented wrapper around CORE::getproto*
- Net/servent.pm Object-oriented wrapper around CORE::getserv*
- Time/gmtime.pm Object-oriented wrapper around CORE::gmtime
- Time/localtime.pm Object-oriented wrapper around CORE::localtime
- Time/tm.pm Perl implementation of "struct tm" for {gm,local}time
- User/grent.pm Object-oriented wrapper around CORE::getgr*
- User/pwent.pm Object-oriented wrapper around CORE::getpw*
+ Class/Struct.pm Declare struct-like datatypes as Perl classes
+ File/stat.pm By-name interface to Perl's builtin stat
+ Net/hostent.pm By-name interface to Perl's builtin gethost*
+ Net/netent.pm By-name interface to Perl's builtin getnet*
+ Net/protoent.pm By-name interface to Perl's builtin getproto*
+ Net/servent.pm By-name interface to Perl's builtin getserv*
+ Time/gmtime.pm By-name interface to Perl's builtin gmtime
+ Time/localtime.pm By-name interface to Perl's builtin localtime
+ Time/tm.pm Internal object for Time::{gm,local}time
+ User/grent.pm By-name interface to Perl's builtin getgr*
+ User/pwent.pm By-name interface to Perl's builtin getpw*
Tie/RefHash.pm Base class for tied hashes with references as keys
UNIVERSAL.pm Base class for *ALL* classes
+=head2 Fcntl
+
+New constants in the existing Fcntl modules are now supported,
+provided that your operating system happens to support them:
+
+ F_GETOWN F_SETOWN
+ O_ASYNC O_DEFER O_DSYNC O_FSYNC O_SYNC
+ O_EXLOCK O_SHLOCK
+
+These constants are intended for use with the Perl operators sysopen()
+and fcntl() and the basic database modules like SDBM_File. For the
+exact meaning of these and other Fcntl constants please refer to your
+operating system's documentation for fcntl() and open().
+
+In addition, the Fcntl module now provides these constants for use
+with the Perl operator flock():
+
+ LOCK_SH LOCK_EX LOCK_NB LOCK_UN
+
+These constants are defined in all environments (because where there is
+no flock() system call, Perl emulates it). However, for historical
+reasons, these constants are not exported unless they are explicitly
+requested with the ":flock" tag (e.g. C<use Fcntl ':flock'>).
+
=head2 IO
The IO module provides a simple mechanism to load all of the IO modules at one
And these functions are now exported:
pi i Re Im arg
- log10 logn cbrt root
- tan cotan asin acos atan acotan
- sinh cosh tanh cotanh asinh acosh atanh acotanh
+ log10 logn ln cbrt root
+ tan
+ csc sec cot
+ asin acos atan
+ acsc asec acot
+ sinh cosh tanh
+ csch sech coth
+ asinh acosh atanh
+ acsch asech acoth
cplx cplxe
+=head2 Math::Trig
+
+This new module provides a simpler interface to parts of Math::Complex for
+those who need trigonometric functions only for real numbers.
+
=head2 DB_File
There have been quite a few changes made to DB_File. Here are a few of
Major rewrite - support added for both udp echo and real icmp pings.
-=head2 Overridden Built-ins
+=head2 Object-oriented overrides for builtin operators
-Many of the Perl built-ins returning lists now have
+Many of the Perl builtins returning lists now have
object-oriented overrides. These are:
File::stat
=head1 Utility Changes
+=head2 pod2html
+
+=over
+
+=item Sends converted HTML to standard output
+
+The I<pod2html> utility included with Perl 5.004 is entirely new.
+By default, it sends the converted HTML to its standard output,
+instead of writing it to a file like Perl 5.003's I<pod2html> did.
+Use the B<--outfile=FILENAME> option to write to a file.
+
+=back
+
=head2 xsubpp
=over
error on the I<second> call to a given method (since there is no cache
on the first call).
+=item C<perl_eval_pv>
+
+A new function handy for eval'ing strings of Perl code inside C code.
+This function returns the value from the eval statement, which can
+be used instead of fetching globals from the symbol table. See
+L<perlguts>, L<perlembed> and L<perlcall> for details and examples.
+
=item Extended API for manipulating hashes
Internal handling of hash keys has changed. The old hashtable API is
still fully supported, and will likely remain so. The additions to the
API allow passing keys as C<SV*>s, so that C<tied> hashes can be given
-real scalars as keys rather than plain strings (non-tied hashes still
+real scalars as keys rather than plain strings (nontied hashes still
can only use strings as keys). New extensions must use the new hash
access functions and macros if they wish to use C<SV*> keys. These
additions also make it feasible to manipulate C<HE*>s (hash entries),
This document.
+=item L<perlfaq>
+
+Frequently asked questions.
+
=item L<perllocale>
Locale support (internationalization and localization).
Perl internal IO abstraction interface.
+=item L<perlmodlib>
+
+Perl module library and recommended practice for module creation.
+Extracted from L<perlmod> (which is much smaller as a result).
+
=item L<perldebug>
Although not new, this has been massively updated.
(S) A severe warning (mandatory).
(F) A fatal error (trappable).
(P) An internal error you should never see (trappable).
- (X) A very fatal error (non-trappable).
+ (X) A very fatal error (nontrappable).
(A) An alien error message (not generated by Perl).
=over
=item Allocation too large: %lx
-(X) You can't allocate more than 64K on an MSDOS machine.
+(X) You can't allocate more than 64K on an MS-DOS machine.
=item Allocation too large
(F) You can't allocate more than 2^31+"small amount" bytes.
-=item Attempt to free non-existent shared string
+=item Applying %s to %s will act on scalar(%s)
+
+(W) The pattern match (//), substitution (s///), and translation (tr///)
+operators work on scalar values. If you apply one of them to an array
+or a hash, it will convert the array or hash to a scalar value -- the
+length of an array, or the population info of a hash -- and then work on
+that scalar value. This is probably not what you meant to do. See
+L<perlfunc/grep> and L<perlfunc/map> for alternatives.
+
+=item Attempt to free nonexistent shared string
(P) Perl maintains a reference counted internal table of strings to
optimize the storage and access of hash keys and other strings. This
as an lvalue, which is pretty strange. Perhaps you forgot to
dereference it first. See L<perlfunc/substr>.
-=item Unsupported function fork
-
-(F) Your version of executable does not support forking.
-
-Note that under some systems, like OS/2, there may be different flavors of
-Perl executables, some of which may support fork, some not. Try changing
-the name you call Perl by to C<perl_>, C<perl__>, and so on.
-
-=item Ill-formed logical name |%s| in prime_env_iter
+=item Can't redefine active sort subroutine %s
-(W) A warning peculiar to VMS. A logical name was encountered when preparing
-to iterate over %ENV which violates the syntactic rules governing logical
-names. Since it cannot be translated normally, it is skipped, and will not
-appear in %ENV. This may be a benign occurrence, as some software packages
-might directly modify logical name tables and introduce non-standard names,
-or it may indicate that a logical name table has been corrupted.
+(F) Perl optimizes the internal handling of sort subroutines and keeps
+pointers into them. You tried to redefine one such sort subroutine when it
+was currently active, which is not allowed. If you really want to do
+this, you should write C<sort { &func } @x> instead of C<sort func @x>.
=item Can't use bareword ("%s") as %s ref while "strict refs" in use
(F) Only hard references are allowed by "strict refs". Symbolic references
are disallowed. See L<perlref>.
+=item Cannot resolve method `%s' overloading `%s' in package `%s'
+
+(P) Internal error trying to resolve overloading specified by a method
+name (as opposed to a subroutine reference).
+
=item Constant subroutine %s redefined
(S) You redefined a subroutine which had previously been eligible for
inlining. See L<perlsub/"Constant Functions"> for commentary and
workarounds.
+=item Constant subroutine %s undefined
+
+(S) You undefined a subroutine which had previously been eligible for
+inlining. See L<perlsub/"Constant Functions"> for commentary and
+workarounds.
+
+=item Copy method did not return a reference
+
+(F) The method which overloads "=" is buggy. See L<overload/Copy Constructor>.
+
=item Died
(F) You passed die() an empty string (the equivalent of C<die "">) or
you called it with no args and both C<$@> and C<$_> were empty.
+=item Exiting pseudo-block via %s
+
+(W) You are exiting a rather special block construct (like a sort block or
+subroutine) by unconventional means, such as a goto, or a loop control
+statement. See L<perlfunc/sort>.
+
+=item Identifier too long
+
+(F) Perl limits identifiers (names for variables, functions, etc.) to
+252 characters for simple names, somewhat more for compound names (like
+C<$A::B>). You've exceeded Perl's limits. Future versions of Perl are
+likely to eliminate these arbitrary limitations.
+
+=item Illegal character %s (carriage return)
+
+(F) A carriage return character was found in the input. This is an
+error, and not a warning, because carriage return characters can break
+multi-line strings, including here documents (e.g., C<print E<lt>E<lt>EOF;>).
+
+=item Illegal switch in PERL5OPT: %s
+
+(X) The PERL5OPT environment variable may only be used to set the
+following switches: B<-[DIMUdmw]>.
+
=item Integer overflow in hex number
(S) The literal hex number you have specified is too big for your
architecture. On a 32-bit architecture the largest octal literal is
037777777777.
+=item internal error: glob failed
+
+(P) Something went wrong with the external program(s) used for C<glob>
+and C<E<lt>*.cE<gt>>. This may mean that your csh (C shell) is
+broken. If so, you should change all of the csh-related variables in
+config.sh: If you have tcsh, make the variables refer to it as if it
+were csh (e.g. C<full_csh='/usr/bin/tcsh'>); otherwise, make them all
+empty (except that C<d_csh> should be C<'undef'>) so that Perl will
+think csh is missing. In either case, after editing config.sh, run
+C<./Configure -S> and rebuild Perl.
+
+=item Invalid conversion in %s: "%s"
+
+(W) Perl does not understand the given format conversion.
+See L<perlfunc/sprintf>.
+
+=item Invalid type in pack: '%s'
+
+(F) The given character is not a valid pack type. See L<perlfunc/pack>.
+
+=item Invalid type in unpack: '%s'
+
+(F) The given character is not a valid unpack type. See L<perlfunc/unpack>.
+
=item Name "%s::%s" used only once: possible typo
(W) Typographical errors often show up as unique variable names.
The sole exception to this is that C<sysread()>ing past the buffer
will extend the buffer and zero pad the new area.
-=item Stub found while resolving method `%s' overloading `%s' in package `%s'
-
-(P) Overloading resolution over @ISA tree may be broken by importing stubs.
-Stubs should never be implicitely created, but explicit calls to C<can>
-may break this.
-
-=item Cannot resolve method `%s' overloading `%s' in package `s'
-
-(P) Internal error trying to resolve overloading specified by a method
-name (as opposed to a subroutine reference).
-
=item Out of memory!
(X|F) The malloc() function returned 0, indicating there was insufficient
the request was judged large enough (compile-time default is 64K), so
a possibility to shut down by trapping this error is granted.
+=item panic: frexp
+
+(P) The library function frexp() failed, making printf("%f") impossible.
+
=item Possible attempt to put comments in qw() list
(W) qw() lists contain items separated by whitespace; as with literal
like a list when you assign to it, and provides a list context to its
subscript, which can do weird things if you're expecting only one subscript.
+=item Stub found while resolving method `%s' overloading `%s' in package `%s'
+
+(P) Overloading resolution over @ISA tree may be broken by importing stubs.
+Stubs should never be implicitely created, but explicit calls to C<can>
+may break this.
+
+=item Too late for "B<-T>" option
+
+(X) The #! line (or local equivalent) in a Perl script contains the
+B<-T> option, but Perl was not invoked with B<-T> in its argument
+list. This is an error because, by the time Perl discovers a B<-T> in
+a script, it's too late to properly taint everything from the
+environment. So Perl gives up.
+
=item untie attempted while %d inner references still exist
(W) A copy of the object returned from C<tie> (or C<tied>) was still
valid when C<untie> was called.
-=item Value of %s construct can be "0"; test with defined()
+=item Unrecognized character %s
+
+(F) The Perl parser has no idea what to do with the specified character
+in your Perl script (or eval). Perhaps you tried to run a compressed
+script, a binary program, or a directory as a Perl program.
+
+=item Unsupported function fork
+
+(F) Your version of executable does not support forking.
+
+Note that under some systems, like OS/2, there may be different flavors of
+Perl executables, some of which may support fork, some not. Try changing
+the name you call Perl by to C<perl_>, C<perl__>, and so on.
+
+=item Use of "$$<digit>" to mean "${$}<digit>" is deprecated
-(W) In a conditional expression, you used <HANDLE>, <*> (glob), or
-C<readdir> as a boolean value. Each of these constructs can return a
-value of "0"; that would make the conditional expression false, which
-is probably not what you intended. When using these constructs in
-conditional expressions, test their values with the C<defined> operator.
+(D) Perl versions before 5.004 misinterpreted any type marker followed
+by "$" and a digit. For example, "$$0" was incorrectly taken to mean
+"${$}0" instead of "${$0}". This bug is (mostly) fixed in Perl 5.004.
+
+However, the developers of Perl 5.004 could not fix this bug completely,
+because at least two widely-used modules depend on the old meaning of
+"$$0" in a string. So Perl 5.004 still interprets "$$<digit>" in the
+old (broken) way inside strings; but it generates this message as a
+warning. And in Perl 5.005, this special treatment will cease.
+
+=item Value of %s can be "0"; test with defined()
+
+(W) In a conditional expression, you used <HANDLE>, <*> (glob), C<each()>,
+or C<readdir()> as a boolean value. Each of these constructs can return a
+value of "0"; that would make the conditional expression false, which is
+probably not what you intended. When using these constructs in conditional
+expressions, test their values with the C<defined> operator.
=item Variable "%s" may be unavailable
This problem can usually be solved by making the inner subroutine
anonymous, using the C<sub {}> syntax. When inner anonymous subs that
reference variables in outer subroutines are called or referenced,
-they are automatically re-bound to the current values of such
+they are automatically rebound to the current values of such
variables.
=item Warning: something's wrong
(W) You passed warn() an empty string (the equivalent of C<warn "">) or
you called it with no args and C<$_> was empty.
+=item Ill-formed logical name |%s| in prime_env_iter
+
+(W) A warning peculiar to VMS. A logical name was encountered when preparing
+to iterate over %ENV which violates the syntactic rules governing logical
+names. Since it cannot be translated normally, it is skipped, and will not
+appear in %ENV. This may be a benign occurrence, as some software packages
+might directly modify logical name tables and introduce nonstandard names,
+or it may indicate that a logical name table has been corrupted.
+
=item Got an error from DosAllocMem
(P) An error peculiar to OS/2. Most probably you're using an obsolete
=item Malformed PERLLIB_PREFIX
-(F) An error peculiar to OS/2. PERLLIB_PREFIX should be of the form
+(F) An error peculiar to OS/2. PERLLIB_PREFIX should be of the form
prefix1;prefix2
prefix1 prefix2
-with non-empty prefix1 and prefix2. If C<prefix1> is indeed a prefix of
-a builtin library search path, prefix2 is substituted. The error may appear
-if components are not found, or are too long. See L<perlos2/"PERLLIB_PREFIX">.
+with nonempty prefix1 and prefix2. If C<prefix1> is indeed a prefix
+of a builtin library search path, prefix2 is substituted. The error
+may appear if components are not found, or are too long. See
+"PERLLIB_PREFIX" in F<README.os2>.
=item PERL_SH_DIR too long
(F) An error peculiar to OS/2. PERL_SH_DIR is the directory to find the
-C<sh>-shell in. See L<perlos2/"PERL_SH_DIR">.
+C<sh>-shell in. See "PERL_SH_DIR" in F<README.os2>.
=item Process terminated by SIG%s
(W) This is a standard message issued by OS/2 applications, while *nix
-applications die in silence. It is considered a feature of the OS/2
-port. One can easily disable this by appropriate sighandlers, see
-L<perlipc/"Signals">. See L<perlos2/"Process terminated by SIGTERM/SIGINT">.
+applications die in silence. It is considered a feature of the OS/2
+port. One can easily disable this by appropriate sighandlers, see
+L<perlipc/"Signals">. See also "Process terminated by SIGTERM/SIGINT"
+in F<README.os2>.
=back
from innumerable contributors, with kibitzing by more than a few Perl
porters.
-Last update: Sat Mar 8 19:51:26 EST 1997
+Last update: Wed May 14 11:14:09 EDT 1997
https://perl5.git.perl.org / perl5.git / blobdiff