Added 'zero' command to wipe partition tables and superblocks.

1 files changed, 52 insertions, 0 deletions

diff --git a/daemon/zero.c b/daemon/zero.c
new file mode 100644
index 00000000..2c20abc3
--- /dev/null
+++ b/daemon/zero.c
@@ -0,0 +1,52 @@
+/* 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 <fcntl.h>
+#include <unistd.h>
+
+#include "daemon.h"
+#include "actions.h"
+
+int
+do_zero (const char *device)
+{
+  int fd, i;
+  char buf[4096];
+
+  IS_DEVICE (device, -1);
+
+  fd = open (device, O_WRONLY);
+  if (fd == -1) {
+    reply_with_perror ("%s", device);
+    return -1;
+  }
+
+  memset (buf, 0, sizeof buf);
+
+  for (i = 0; i < 32; ++i)
+    (void) write (fd, buf, sizeof buf);
+
+  close (fd);
+
+  return 0;
+}