Added ping-daemon command.

daemon/Makefile.am

@@ -39,6 +39,7 @@ guestfsd_SOURCES = \
 	ls.c \
 	lvm.c \
 	mount.c \
+	pingdaemon.c \
 	proto.c \
 	stat.c \
 	stubs.c \

daemon/pingdaemon.c

@@ -0,0 +1,32 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2009 Red Hat Inc. 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "daemon.h"
+#include "actions.h"
+
+int
+do_ping_daemon (void)
+{
+  return 0;
+}

src/generator.ml

@@ -1766,6 +1766,16 @@ verbose messages with C<guestfs_set_verbose> or by setting
 the environment variable C<LIBGUESTFS_DEBUG=1> before
 running the program.");
 
+  ("ping_daemon", (RErr, []), 92, [],
+   [InitEmpty, TestRun (
+      [["ping_daemon"]])],
+   "ping the guest daemon",
+   "\
+This is a test probe into the guestfs daemon running inside
+the qemu subprocess.  Calling this function checks that the
+daemon responds to the ping message, without affecting the daemon
+or attached block device(s) in any other way.");
+
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions