1/* vi: set sw=4 ts=4: */ 2/* 3 * Utility routines. 4 * 5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> 6 * 7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 8 */ 9 10#include "libbb.h" 11#include <mntent.h> 12 13/* 14 * Given a block device, find the mount table entry if that block device 15 * is mounted. 16 * 17 * Given any other file (or directory), find the mount table entry for its 18 * filesystem. 19 */ 20struct mntent *find_mount_point(const char *name, const char *table) 21{ 22 struct stat s; 23 dev_t mountDevice; 24 FILE *mountTable; 25 struct mntent *mountEntry; 26 27 if (stat(name, &s) != 0) 28 return 0; 29 30 if ((s.st_mode & S_IFMT) == S_IFBLK) 31 mountDevice = s.st_rdev; 32 else 33 mountDevice = s.st_dev; 34 35 36 mountTable = setmntent(table ? table : bb_path_mtab_file, "r"); 37 if (!mountTable) 38 return 0; 39 40 while ((mountEntry = getmntent(mountTable)) != 0) { 41 if (strcmp(name, mountEntry->mnt_dir) == 0 42 || strcmp(name, mountEntry->mnt_fsname) == 0 43 ) { /* String match. */ 44 break; 45 } 46 if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == mountDevice) /* Match the device. */ 47 break; 48 if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == mountDevice) /* Match the directory's mount point. */ 49 break; 50 } 51 endmntent(mountTable); 52 return mountEntry; 53} 54