1 files changed, 32 insertions, 0 deletions
diff --git a/t/io/dup.t b/t/io/dup.t
new file mode 100644
index 0000000000..e5ea7d410d
--- /dev/null
+++ b/t/io/dup.t
@@ -0,0 +1,32 @@
+#!./perl
+
+# $Header: dup.t,v 4.0 91/03/20 01:50:49 lwall Locked $
+
+print "1..6\n";
+
+print "ok 1\n";
+
+open(dupout,">&STDOUT");
+open(duperr,">&STDERR");
+
+open(STDOUT,">Io.dup") || die "Can't open stdout";
+open(STDERR,">&STDOUT") || die "Can't open stderr";
+
+select(STDERR); $| = 1;
+select(STDOUT); $| = 1;
+
+print STDOUT "ok 2\n";
+print STDERR "ok 3\n";
+system 'echo ok 4';
+system 'echo ok 5 1>&2';
+
+close(STDOUT);
+close(STDERR);
+
+open(STDOUT,">&dupout");
+open(STDERR,">&duperr");
+
+system 'cat Io.dup';
+unlink 'Io.dup';
+
+print STDOUT "ok 6\n";