In perl.git, the branch blead has been updated
<http://perl5.git.perl.org/perl.git/commitdiff/064fb7979931c2a2ac6711c9687db30bd89dcde8?hp=610996fda2dae66f57562c2ae9ab5c005b8e0c69>
- Log -----------------------------------------------------------------
commit 064fb7979931c2a2ac6711c9687db30bd89dcde8
Author: Leon Timmermans <faw...@gmail.com>
Date: Wed May 15 23:04:03 2013 +0200
Clarified perldelta entry for UID/GID magic variables
-----------------------------------------------------------------------
Summary of changes:
pod/perldelta.pod | 17 +++++++++++++++--
1 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 2721a1c..4a21c4a 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -763,8 +763,21 @@ active user.
Swapping of $< and $>
-For more information about this future deprecation, see L<the relevant RT
-ticket|https://rt.perl.org/rt3/Ticket/Display.html?id=96212>.
+Perl has supported the idiom of swapping $< and $> (and likewise $( and
+$)) to temporarily drop permissions since 5.0, like this:
+
+ ($<, $>) = ($>, $<);
+
+However, this idiom modifies the real user/group id, which can have
+undesirable side-effects, is no longer useful on any platform perl
+supports and complicates the implementation of these variables and list
+assignment in general.
+
+As an alternative, assignment only to C<< $> >> is recommended:
+
+ local $> = $<;
+
+See also: L<Setuid
Demystified|http://www.cs.berkeley.edu/~daw/papers/setuid-usenix02.pdf>.
=item *
--
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