PERL_SIGNALS=unsafe enables the old unsafe/immediate signals.

p4raw-id: //depot/perl@18766

1 files changed, 5 insertions, 1 deletions

diff --git a/pod/perlipc.pod b/pod/perlipc.pod
index f55bdff505..b743d4df04 100644
--- a/pod/perlipc.pod
+++ b/pod/perlipc.pod
@@ -279,7 +279,7 @@ to find out whether anyone (or anything) has accidentally removed our fifo.
 	sleep 2;    # to avoid dup signals
     }
 
-=head2 Deferred Signals
+=head2 Deferred Signals (Safe signals)
 
 In Perls before Perl 5.7.3 by installing Perl code to deal with
 signals, you were exposing yourself to danger from two things.  First,
@@ -368,6 +368,10 @@ there are un-waited-for completed child processes.
 
 =back
 
+If you want the old signal behaviour back regardless of possible
+memory corruption, set the environment variable C<PERL_SIGNALS> to
+C<"unsafe">.
+
 =head1 Using open() for IPC
 
 Perl's basic open() statement can also be used for unidirectional