Add in freeramdisk.c, which (duh) frees ramdisks. If you have any

ramdisks lying about and want to free up the memory they have used,
this baby is the answar you have been waiting for.
 -Erik


git-svn-id: svn://busybox.net/trunk/busybox@387 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 69 insertions, 0 deletions

diff --git a/util-linux/freeramdisk.c b/util-linux/freeramdisk.c
new file mode 100644
index 000000000..426e13231
--- /dev/null
+++ b/util-linux/freeramdisk.c
@@ -0,0 +1,69 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * freeramdisk implementation for busybox
+ *
+ * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
+ * Adjusted a bit by Erik Andersen <andersee@debian.org>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/mount.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+#include "internal.h"
+
+
+static const char freeramdisk_usage[] =
+        "freeramdisk DEVICE\n\n"
+        "Frees all memory used by the specified ramdisk.\n";
+
+extern int
+freeramdisk_main(int argc, char **argv)
+{
+        char  rname[256] = "/dev/ram";
+        int   f;
+
+        if (argc >= 2 || ( argv[1] && *argv[1] == '-')) {
+                usage(freeramdisk_usage);
+        }
+
+        if (argc >1)
+                strcpy(rname, argv[1]);
+
+        if ((f = open(rname, O_RDWR)) == -1) {
+                fatalError( "freeramdisk: cannot open %s: %s", rname, strerror(errno));
+        }
+        if (ioctl(f, BLKFLSBUF) < 0) {
+                fatalError( "freeramdisk: failed ioctl on %s: %s", rname, strerror(errno));
+        }
+        close(f);
+        exit(TRUE);
+}
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
+