Fix 'mmap' lib/filehand.t (ungetc) test fail.

Make 'unix' pass most tests
 - do unread by temporary push of layer ("pending") holding unread chars
 - fast_gets is now based on per-handle flag
 - relax one of io/pipe.t tests to allow print to fail and close to
   succeed so that it passes on unbuffered "unix" layer.
Remaining fail is sporadic and a genuine race condition between
parent/child in fork test.

p4raw-id: //depot/perlio@7942

1 files changed, 15 insertions, 4 deletions

diff --git a/t/io/pipe.t b/t/io/pipe.t
index 96935e3f88..95cdd5587e 100755
--- a/t/io/pipe.t
+++ b/t/io/pipe.t
@@ -99,12 +99,23 @@ else {
     local $SIG{PIPE} = 'IGNORE';
     open NIL, '|true'	or die "open failed: $!";
     sleep 5;
-    print NIL 'foo'	or die "print failed: $!";
-    if (close NIL) {
-	print "not ok 9\n";
+    if (print NIL 'foo') {
+	# If print was allowed we had better get an error on close
+	if (close NIL) {
+	    print "not ok 9\n";
+	}
+	else {
+	    print "ok 9\n";
+	}
     }
     else {
-	print "ok 9\n";
+	# If print failed, the close should be clean
+	if (close NIL) {
+	    print "ok 9\n";
+	}
+	else {
+	    print "not ok 9\n";
+	}
     }
 }