hush: add a TODO about redir3.tests failure

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/hush.c

@@ -7723,6 +7723,10 @@ static NOINLINE int run_pipe(struct pipe *pi)
 			unset_vars(new_env);
 			add_vars(old_vars);
 /* clean_up_and_ret0: */
+
+//FIXME: this restores stdio fds, but does not close other redirects!
+//Example: after "echo TEST 9>/dev/null" fd#9 is not closed!
+//The squirreling code needs rework to remember all fds, not just 0,1,2.
 			restore_redirects(squirrel);
  clean_up_and_ret1:
 			free(argv_expanded);

shell/hush_test/hush-redir/redir3.right

@@ -0,0 +1,3 @@
+TEST
+./redir3.tests: line 4: 9: Bad file descriptor
+Output to fd#9: 1

shell/hush_test/hush-redir/redir3.tests

@@ -0,0 +1,5 @@
+# redirects to closed descriptors should not leave these descriptors
+# open afterwards
+echo TEST 9>/dev/null
+echo MUST ERROR OUT >&9
+echo "Output to fd#9: $?"