1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 extern char *find_real_root_device_name(const char* name)
34 struct stat statBuf, rootStat;
35 char *fileName = NULL;
38 if (stat("/", &rootStat) != 0)
39 bb_perror_msg("could not stat '/'");
41 /* This check is here in case they pass in /dev name */
42 if ((rootStat.st_mode & S_IFMT) == S_IFBLK)
43 dev = rootStat.st_rdev;
45 dev = rootStat.st_dev;
47 dir = opendir("/dev");
49 bb_perror_msg("could not open '/dev'");
51 while((entry = readdir(dir)) != NULL) {
52 const char *myname = entry->d_name;
53 /* Must skip ".." since that is "/", and so we
54 * would get a false positive on ".." */
55 if (myname[0] == '.' && myname[1] == '.' && !myname[2])
58 fileName = concat_path_file("/dev", myname);
60 /* Some char devices have the same dev_t as block
61 * devices, so make sure this is a block device */
62 if (stat(fileName, &statBuf) == 0 &&
63 S_ISBLK(statBuf.st_mode)!=0 &&
64 statBuf.st_rdev == dev)
73 fileName = bb_xstrdup("/dev/root");