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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Utility routines.
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4 | *
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5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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8 | */
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9 |
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10 | #include "libbb.h"
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11 | #include <mntent.h>
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12 |
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13 | /*
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14 | * Given a block device, find the mount table entry if that block device
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15 | * is mounted.
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16 | *
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17 | * Given any other file (or directory), find the mount table entry for its
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18 | * filesystem.
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19 | */
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20 | struct mntent *find_mount_point(const char *name, const char *table)
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21 | {
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22 | struct stat s;
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23 | dev_t mountDevice;
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24 | FILE *mountTable;
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25 | struct mntent *mountEntry;
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26 |
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27 | if (stat(name, &s) != 0)
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28 | return 0;
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29 |
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30 | if ((s.st_mode & S_IFMT) == S_IFBLK)
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31 | mountDevice = s.st_rdev;
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32 | else
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33 | mountDevice = s.st_dev;
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34 |
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35 |
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36 | mountTable = setmntent(table ? table : bb_path_mtab_file, "r");
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37 | if (!mountTable)
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38 | return 0;
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39 |
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40 | while ((mountEntry = getmntent(mountTable)) != 0) {
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41 | if (strcmp(name, mountEntry->mnt_dir) == 0
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42 | || strcmp(name, mountEntry->mnt_fsname) == 0
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43 | ) { /* String match. */
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44 | break;
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45 | }
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46 | if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == mountDevice) /* Match the device. */
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47 | break;
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48 | if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == mountDevice) /* Match the directory's mount point. */
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49 | break;
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50 | }
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51 | endmntent(mountTable);
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52 | return mountEntry;
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53 | }
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