sh: Test that . /dev/null returns exit status 0 and does not preserve $?.

Preserving $? may cause problems particularly if set -e is in effect.

It may be useful to preserve the old value of $? in the dot script but this
must not be implemented in such a way that it would break this test.

Obtained-from:  FreeBSD 219390

diff --git a/tools/regression/bin/sh/builtins/dot3.0 b/tools/regression/bin/sh/builtins/dot3.0
new file mode 100644 (file)
index 0000000..7fd2175
--- /dev/null
+++ b/tools/regression/bin/sh/builtins/dot3.0
@@ -0,0 +1,10 @@
+# $FreeBSD: src/tools/regression/bin/sh/builtins/dot3.0,v 1.1 2011/03/07 23:52:23 jilles Exp $
+
+# . should return 0 if no command was executed.
+
+if false; then
+       exit 3
+else
+       . /dev/null
+       exit $?
+fi