1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * freeramdisk and fdflush implementations for busybox
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4 | *
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5 | * Copyright (C) 2000 and written by Emanuele Caratti <wiz@iol.it>
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6 | * Adjusted a bit by Erik Andersen <andersen@codepoet.org>
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7 | * Unified with fdflush by Tito Ragusa <farmatito@tiscali.it>
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8 | *
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9 | * Licensed under GPLv2, see file LICENSE in this source tree.
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10 | */
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11 |
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12 | //usage:#define freeramdisk_trivial_usage
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13 | //usage: "DEVICE"
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14 | //usage:#define freeramdisk_full_usage "\n\n"
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15 | //usage: "Free all memory used by the specified ramdisk"
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16 | //usage:
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17 | //usage:#define freeramdisk_example_usage
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18 | //usage: "$ freeramdisk /dev/ram2\n"
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19 | //usage:
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20 | //usage:#define fdflush_trivial_usage
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21 | //usage: "DEVICE"
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22 | //usage:#define fdflush_full_usage "\n\n"
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23 | //usage: "Force floppy disk drive to detect disk change"
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24 |
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25 | #include <sys/mount.h>
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26 | #include "libbb.h"
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27 |
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28 | /* From <linux/fd.h> */
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29 | #define FDFLUSH _IO(2,0x4b)
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30 |
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31 | int freeramdisk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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32 | int freeramdisk_main(int argc UNUSED_PARAM, char **argv)
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33 | {
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34 | int fd;
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35 |
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36 | fd = xopen(single_argv(argv), O_RDWR);
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37 |
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38 | // Act like freeramdisk, fdflush, or both depending on configuration.
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39 | ioctl_or_perror_and_die(fd, (ENABLE_FREERAMDISK && applet_name[1] == 'r')
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40 | || !ENABLE_FDFLUSH ? BLKFLSBUF : FDFLUSH, NULL, "%s", argv[1]);
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41 |
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42 | if (ENABLE_FEATURE_CLEAN_UP) close(fd);
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43 |
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44 | return EXIT_SUCCESS;
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45 | }
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