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[821] | 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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[1765] | 11 | #include <mntent.h>
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[821] | 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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[1765] | 36 | mountTable = setmntent(table ? table : bb_path_mtab_file, "r");
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| 37 | if (!mountTable)
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[821] | 38 | return 0;
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| 39 |
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| 40 | while ((mountEntry = getmntent(mountTable)) != 0) {
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[1765] | 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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[821] | 44 | break;
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[1765] | 45 | }
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[821] | 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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