LXR busybox/util-linux/freeramdisk.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * freeramdisk and fdflush implementations for busybox
   4 *
   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>
   8 *
   9 * Licensed under GPLv2, see file LICENSE in this tarball for details.
  10 */
  11#include <sys/mount.h>
  12#include "libbb.h"
  13
  14/* From <linux/fd.h> */
  15#define FDFLUSH  _IO(2,0x4b)
  16
  17int freeramdisk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  18int freeramdisk_main(int argc, char **argv)
  19{
  20        int fd;
  21
  22        if (argc != 2) bb_show_usage();
  23
  24        fd = xopen(argv[1], O_RDWR);
  25
  26        // Act like freeramdisk, fdflush, or both depending on configuration.
  27        ioctl_or_perror_and_die(fd, (ENABLE_FREERAMDISK && applet_name[1]=='r')
  28                        || !ENABLE_FDFLUSH ? BLKFLSBUF : FDFLUSH, NULL, "%s", argv[1]);
  29
  30        if (ENABLE_FEATURE_CLEAN_UP) close(fd);
  31
  32        return EXIT_SUCCESS;
  33}
  34