Fix the sys/fcntl.h problem reported by Peter Prymmer.

[p5sagit/p5-mst-13.2.git] / pod / perlvar.pod

diff --git a/pod/perlvar.pod b/pod/perlvar.pod
index 8b025c5..718484f 100644 (file)
--- a/pod/perlvar.pod
+++ b/pod/perlvar.pod
@@ -174,6 +174,8 @@ example:
 (Mnemonic: be positive and forward looking.)
 This variable is read-only and dynamically scoped to the current BLOCK.
 
+=item @LAST_MATCH_END
+
 =item @+
 
 This array holds the offsets of the ends of the last successful
@@ -191,17 +193,22 @@ examples given for the C<@-> variable.
 
 =item $*
 
-Set to 1 to do multi-line matching within a string, 0 to tell Perl
-that it can assume that strings contain a single line, for the purpose
-of optimizing pattern matches.  Pattern matches on strings containing
-multiple newlines can produce confusing results when C<$*> is 0.  Default
-is 0.  (Mnemonic: * matches multiple things.)  This variable
-influences the interpretation of only C<^> and C<$>.  A literal newline can
-be searched for even when C<$* == 0>.
+Set to a non-zero integer value to do multi-line matching within a
+string, 0 (or undefined) to tell Perl that it can assume that strings
+contain a single line, for the purpose of optimizing pattern matches.
+Pattern matches on strings containing multiple newlines can produce
+confusing results when C<$*> is 0 or undefined. Default is undefined.
+(Mnemonic: * matches multiple things.) This variable influences the
+interpretation of only C<^> and C<$>. A literal newline can be searched
+for even when C<$* == 0>.
 
 Use of C<$*> is deprecated in modern Perl, supplanted by 
 the C</s> and C</m> modifiers on pattern matching.
 
+Assigning a non-numerical value to C<$*> triggers a warning (and makes
+C<$*> act if C<$* == 0>), while assigning a numerical value to C<$*>
+makes that an implicit C<int> is applied on the value.
+
 =item input_line_number HANDLE EXPR
 
 =item $INPUT_LINE_NUMBER
@@ -412,6 +419,8 @@ channel.
 Used with formats.
 (Mnemonic: lines_on_page - lines_printed.)
 
+=item @LAST_MATCH_START
+
 =item @-
 
 $-[0] is the offset of the start of the last successful match.
@@ -615,7 +624,8 @@ across fork() calls.  (Mnemonic: same as shells.)
 =item $<
 
 The real uid of this process.  (Mnemonic: it's the uid you came I<from>,
-if you're running setuid.)
+if you're running setuid.)  You can change both the real uid and
+the effective uid at the same time by using POSIX::setuid().
 
 =item $EFFECTIVE_USER_ID
 
@@ -628,6 +638,9 @@ The effective uid of this process.  Example:
     $< = $>;           # set real to effective uid
     ($<,$>) = ($>,$<); # swap real and effective uid
 
+You can change both the effective uid and the real uid at the same
+time by using POSIX::setuid().
+
 (Mnemonic: it's the uid you went I<to>, if you're running setuid.)
 C<< $< >> and C<< $> >> can be swapped only on machines
 supporting setreuid().
@@ -648,6 +661,9 @@ However, a value assigned to C<$(> must be a single number used to
 set the real gid.  So the value given by C<$(> should I<not> be assigned
 back to C<$(> without being forced numeric, such as by adding zero.
 
+You can change both the real gid and the effective gid at the same
+time by using POSIX::setgid().
+
 (Mnemonic: parentheses are used to I<group> things.  The real gid is the
 group you I<left>, if you're running setgid.)
 
@@ -670,6 +686,9 @@ empty list for setgroups(), just repeat the new effective gid; that is,
 to force an effective gid of 5 and an effectively empty setgroups()
 list, say C< $) = "5 5" >.
 
+You can change both the effective gid and the real gid at the same
+time by using POSIX::setgid() (use only a single numeric argument).
+
 (Mnemonic: parentheses are used to I<group> things.  The effective gid
 is the group that's I<right> for you, if you're running setgid.)
 
@@ -687,6 +706,11 @@ program sees.  This is more useful as a way of indicating the current
 program state than it is for hiding the program you're running.
 (Mnemonic: same as B<sh> and B<ksh>.)
 
+Note for BSD users: setting C<$0> does not completely remove "perl"
+from the ps(1) output.  For example, setting C<$0> to C<"foobar"> will
+result in C<"perl: foobar (perl)">.  This is an operating system
+feature.
+
 =item $[
 
 The index of the first element in an array, and of the first character
@@ -814,10 +838,10 @@ Then
 
     $^M = 'a' x (1 << 16);
 
-would allocate a 64K buffer for use when in emergency.  See the
+would allocate a 64K buffer for use in an emergency.  See the
 F<INSTALL> 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<English> long name for this variable.
+feature, there is no L<English|English> long name for this variable.
 
 =item $OSNAME