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/* vi: set sw=4 ts=4: */
/*
* freeramdisk and fdflush implementations for busybox
*
* Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
* Adjusted a bit by Erik Andersen <andersen@codepoet.org>
* Unified with fdflush by Tito Ragusa <farmatito@tiscali.it>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <unistd.h>
#include "busybox.h"
/* From linux/fs.h */
#define BLKFLSBUF _IO(0x12,97)
/* From <linux/fd.h> */
#define FDFLUSH _IO(2,0x4b)
int freeramdisk_main(int argc, char **argv)
{
int result;
int fd;
if (argc != 2) bb_show_usage();
fd = bb_xopen(argv[1], O_RDWR);
// Act like freeramdisk, fdflush, or both depending on configuration.
result = ioctl(fd, (ENABLE_FREERAMDISK && bb_applet_name[1]=='r')
|| !ENABLE_FDFLUSH ? BLKFLSBUF : FDFLUSH);
if (ENABLE_FEATURE_CLEAN_UP) close(fd);
if (result) bb_perror_msg_and_die("%s", argv[1]);
return EXIT_SUCCESS;
}
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