X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperlvar.pod;h=68c8303aea6c2b77d733d8cf4f2c850bcf69eb56;hb=3b910f1cdd4f8ae1cc44d538e0b3182f132b4bf7;hp=39e5c45721e432e11fe52214eb7232252cff616c;hpb=09e04a353e352e671b21e072d112d97d0ff3b125;p=p5sagit%2Fp5-mst-13.2.git diff --git a/pod/perlvar.pod b/pod/perlvar.pod index 39e5c45..68c8303 100644 --- a/pod/perlvar.pod +++ b/pod/perlvar.pod @@ -374,7 +374,8 @@ will read a record of no more than 32768 bytes from FILE. If you're not reading from a record-oriented file (or your OS doesn't have record-oriented files), then you'll likely get a full chunk of data with every read. If a record is larger than the record size you've -set, you'll get the record back in pieces. +set, you'll get the record back in pieces. Trying to set the record +size to zero or less will cause reading in the (rest of the) whole file. On VMS, record reads are done with the equivalent of C, so it's best not to mix record and non-record reads on the same @@ -883,8 +884,8 @@ directive, and cannot influence the behavior of any other file. Its use is highly discouraged. Note that, unlike other compile-time directives (such as L), -assignment to $[ can be seen from outer lexical scopes in the same file. -However, you can use local() on it to strictly bound its value to a +assignment to C<$[> can be seen from outer lexical scopes in the same file. +However, you can use local() on it to strictly bind its value to a lexical block. =item $] @@ -994,11 +995,8 @@ version of the same lexical pragma: =item %^H -WARNING: This variable is strictly for internal use only. Its availability, -behavior, and contents are subject to change without notice. - The %^H hash provides the same scoping semantic as $^H. This makes it -useful for implementation of lexically scoped pragmas. +useful for implementation of lexically scoped pragmas. See L. =item $INPLACE_EDIT @@ -1012,15 +1010,16 @@ inplace editing. (Mnemonic: value of B<-i> switch.) By default, running out of memory is an untrappable, fatal error. However, if suitably built, Perl can use the contents of C<$^M> as an emergency memory pool after die()ing. Suppose that your Perl -were compiled with -DPERL_EMERGENCY_SBRK and used Perl's malloc. +were compiled with C<-DPERL_EMERGENCY_SBRK> and used Perl's malloc. Then $^M = 'a' x (1 << 16); would allocate a 64K buffer for use in an emergency. See the F file in the Perl distribution for information on how to -enable this option. To discourage casual use of this advanced -feature, there is no L long name for this variable. +add custom C compilation flags when compiling perl. To discourage casual +use of this advanced feature, there is no L long name for +this variable. =item $OSNAME @@ -1144,6 +1143,12 @@ documentation for the C<-C> switch for more information about the possible values. This variable is set during Perl startup and is thereafter read-only. +=item ${^UTF8CACHE} + +This variable controls the state of the internal UTF-8 offset caching code. +1 for on (the default), 0 for off, -1 to debug the caching code by checking +all its results against linear scans, and panicking on any discrepancy. + =item ${^UTF8LOCALE} This variable indicates whether an UTF-8 locale was detected by perl at @@ -1161,11 +1166,14 @@ it equals C and will return true for C<$^V eq v5.6.0>. Note that the characters in this string value can potentially be in Unicode range. +This variable first appeared in perl 5.6.0; earlier versions of perl will +see an undefined value. + This can be used to determine whether the Perl interpreter executing a script is in the right range of versions. (Mnemonic: use ^V for Version Control.) Example: - warn "No \"our\" declarations!\n" if $^V and $^V lt v5.6.0; + warn "Hashes not randomized!\n" if !$^V or $^V lt v5.8.1 To convert C<$^V> into its string representation use sprintf()'s C<"%vd"> conversion: @@ -1190,12 +1198,25 @@ related to the B<-w> switch.) See also L. The current set of warning checks enabled by the C pragma. See the documentation of C for more details. +=item ${^WIN32_SLOPPY_STAT} + +If this variable is set to a true value, then stat() on Windows will +not try to open the file. This means that the link count cannot be +determined and file attributes may be out of date if additional +hardlinks to the file exist. On the other hand, not opening the file +is considerably faster, especially for files on network drives. + +This variable could be set in the F file to +configure the local Perl installation to use "sloppy" stat() by +default. See L for more information about site +customization. + =item $EXECUTABLE_NAME =item $^X The name used to execute the current copy of Perl, from C's -C. +C or (where supported) F. Depending on the host operating system, the value of $^X may be a relative or absolute pathname of the perl program file, or may @@ -1494,11 +1515,11 @@ control-character name that begins with C<^_> will acquire a special meaning in any future version of Perl; such names may therefore be used safely in programs. C<$^_> itself, however, I reserved. -Perl identifiers that consist of all digits, or begin with control -characters, or are a single punctuation character, are exempt from the -effects of the C declaration and are always forced to be in -package C
; they are also exempt from C errors. A -few other names are also exempt in these ways: +Perl identifiers that begin with digits, control characters, or +punctuation characters are exempt from the effects of the C +declaration and are always forced to be in package C
; they are +also exempt from C errors. A few other names are also +exempt in these ways: ENV STDIN INC STDOUT