1 /* vi: set sw=4 ts=4: */
3 * freeramdisk and fdflush implementations for busybox
5 * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
6 * Adjusted a bit by Erik Andersen <andersen@codepoet.org>
7 * Unified with fdflush by Tito Ragusa <farmatito@tiscali.it>
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
14 #include <sys/types.h>
16 #include <sys/ioctl.h>
21 /* From <linux/fd.h> */
22 #define FDFLUSH _IO(2,0x4b)
24 int freeramdisk_main(int argc, char **argv)
29 if (argc != 2) bb_show_usage();
31 fd = bb_xopen(argv[1], O_RDWR);
33 // Act like freeramdisk, fdflush, or both depending on configuration.
34 result = ioctl(fd, (ENABLE_FREERAMDISK && bb_applet_name[1]=='r')
35 || !ENABLE_FDFLUSH ? BLKFLSBUF : FDFLUSH);
37 if (ENABLE_FEATURE_CLEAN_UP) close(fd);
39 if (result) bb_perror_msg_and_die("%s", argv[1]);