Added drop-caches command.

1 files changed, 52 insertions, 0 deletions

diff --git a/daemon/dropcaches.c b/daemon/dropcaches.c
new file mode 100644
index 00000000..82d95ee2
--- /dev/null
+++ b/daemon/dropcaches.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 <unistd.h>
+#include <fcntl.h>
+
+#include "daemon.h"
+#include "actions.h"
+
+#define PROCFILE "/proc/sys/vm/drop_caches"
+
+int
+do_drop_caches (int what)
+{
+  FILE *fp;
+
+  sync ();
+
+  fp = fopen (PROCFILE, "w");
+  if (fp == NULL) {
+    reply_with_perror (PROCFILE);
+    return -1;
+  }
+
+  fprintf (fp, "%d", what);
+  if (fclose (fp) == EOF) {
+    reply_with_perror (PROCFILE);
+    return -1;
+  }
+
+  return 0;
+}