Fix to test failures caused by change #29606 when PERLIO=stdio.

Based on suggestions from Ilya Zakharevich in
http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2006-12/msg00646.html
p4raw-link: @29606 on //depot/perl: add1a1a3c3dc28dd49272f4754cfc04acae28e3b

p4raw-id: //depot/perl@29646

diff --git a/lib/SelfLoader.pm b/lib/SelfLoader.pm
index 0c2daeb..a71c68c 100644 (file)
--- a/lib/SelfLoader.pm
+++ b/lib/SelfLoader.pm
@@ -61,10 +61,12 @@ sub _load_stubs {
     croak("$callpack doesn't contain an __DATA__ token")
         unless defined fileno($fh);
     # Protect: fork() shares the file pointer between the parent and the kid
-    open my $nfh, '<&', $fh or croak "reopen: $!";# dup() the fd
-    close $fh or die "close: $1";                 # autocloses, but be paranoid
-    open $fh, '<&', $nfh or croak "reopen2: $!";  # dup() the fd "back"
-    close $nfh or die "close after reopen: $1";   # autocloses, but be paranoid
+    if(sysseek($fh, tell($fh), 0)) {
+      open my $nfh, '<&', $fh or croak "reopen: $!";# dup() the fd
+      close $fh or die "close: $1";                 # autocloses, but be paranoid
+      open $fh, '<&', $nfh or croak "reopen2: $!";  # dup() the fd "back"
+      close $nfh or die "close after reopen: $1";   # autocloses, but be paranoid
+    }
     $Cache{"${currpack}::<DATA"} = 1;   # indicate package is cached
 
     local($/) = "\n";