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54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include <mntent.h>
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/*
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* Given a block device, find the mount table entry if that block device
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* is mounted.
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*
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* Given any other file (or directory), find the mount table entry for its
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* filesystem.
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*/
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struct mntent *find_mount_point(const char *name, const char *table)
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{
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struct stat s;
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dev_t mountDevice;
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FILE *mountTable;
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struct mntent *mountEntry;
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if (stat(name, &s) != 0)
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return 0;
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if ((s.st_mode & S_IFMT) == S_IFBLK)
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mountDevice = s.st_rdev;
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else
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mountDevice = s.st_dev;
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mountTable = setmntent(table ? table : bb_path_mtab_file, "r");
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if (!mountTable)
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return 0;
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while ((mountEntry = getmntent(mountTable)) != 0) {
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if (strcmp(name, mountEntry->mnt_dir) == 0
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|| strcmp(name, mountEntry->mnt_fsname) == 0
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) { /* String match. */
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break;
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}
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if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == mountDevice) /* Match the device. */
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break;
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if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == mountDevice) /* Match the directory's mount point. */
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break;
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}
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endmntent(mountTable);
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return mountEntry;
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}
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