1/* See LICENSE file for copyright and license details. */
 2
 3
 4#include <sys/ioctl.h>
 5#include <sys/mount.h>
 6#include <sys/types.h>
 7
 8#include <fcntl.h>
 9#include <stdio.h>
10#include <stdlib.h>
11#include <unistd.h>
12
13#include "util.h"
14
15static void
16usage(void)
17{
18	eprintf("usage: %s\n", argv0);
19}
20
21// ?man freeramdisk: free ramdisk memory
22// ?man free memory associated with a ramdisk device
23int
24main(int argc, char *argv[])
25{
26	char *dev = "/dev/ram";
27	int fd;
28
29	ARGBEGIN {
30	default:
31		usage();
32	} ARGEND;
33
34	if (argc != 0)
35		usage();
36
37	if ((fd = open(dev, O_RDWR)) < 0)
38		eprintf("open: %s:", dev);
39	if (ioctl(fd, BLKFLSBUF, dev) < 0)
40		eprintf("BLKFLSBUF %s:", dev);
41	close(fd);
42	return 0;
43}