92 lines
2.3 KiB
C
92 lines
2.3 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) tons of folks. Tracking down who wrote what
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* isn't something I'm going to worry about... If you wrote something
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* here, please feel free to acknowledge your work.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
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* Permission has been granted to redistribute this code under the GPL.
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include "libbb.h"
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extern char *find_real_root_device_name(const char* name)
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{
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DIR *dir;
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struct dirent *entry;
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struct stat statBuf, rootStat;
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char *fileName;
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dev_t dev;
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if (stat("/", &rootStat) != 0) {
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perror_msg("could not stat '/'");
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return NULL;
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}
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if ((dev = rootStat.st_rdev)==0) dev=rootStat.st_dev;
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dir = opendir("/dev");
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if (!dir) {
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perror_msg("could not open '/dev'");
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goto fallback;
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}
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while((entry = readdir(dir)) != NULL) {
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/* Must skip ".." since that is "/", and so we
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* would get a false positive on ".." */
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if (strcmp(entry->d_name, "..") == 0)
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continue;
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fileName = concat_path_file("/dev/", entry->d_name);
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/* Some char devices have the same dev_t as block
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* devices, so make sure this is a block device */
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if (stat(fileName, &statBuf) == 0 &&
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S_ISBLK(statBuf.st_mode)!=0 &&
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statBuf.st_rdev == dev) {
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return fileName;
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}
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free(fileName);
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}
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closedir(dir);
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fallback:
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/* don't use stack space, caller expects to free() result */
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fileName=xmalloc(20);
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sprintf(fileName,"(rdev %u)",(unsigned int) rootStat.st_rdev);
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return fileName;
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}
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/* END CODE */
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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