From 2dc9e8a858b62830d15a8186fe575eb7903d2171 Mon Sep 17 00:00:00 2001 From: "Richard W.M. Jones" Date: Fri, 1 May 2009 11:18:44 +0100 Subject: Added drop-caches command. --- daemon/dropcaches.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 daemon/dropcaches.c (limited to 'daemon/dropcaches.c') 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 + +#include +#include +#include +#include +#include + +#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; +} -- cgit