93d7fba892
Hi to all,
This patch is useful for:
1) remove an unused var from extern char *find_real_root_device_name(const char* name)
changing it to extern char *find_real_root_device_name(void).
2) fixes include/libbb.h, coreutils/df.c, util-linux/mount.c and util-linux/umount.c accordingly.
3) fixes a bug, really a false positive, in find_real_root_device_name() that happens if
in the /dev directory exists a link named root (/dev/root) that should be skipped but
is not. This affects applets like df that display wrong results
90 lines
2.3 KiB
C
90 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) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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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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#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(void)
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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 = NULL;
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dev_t dev;
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if (stat("/", &rootStat) != 0)
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bb_perror_msg("could not stat '/'");
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else {
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/* This check is here in case they pass in /dev name */
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if ((rootStat.st_mode & S_IFMT) == S_IFBLK)
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dev = rootStat.st_rdev;
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else
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dev = rootStat.st_dev;
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dir = opendir("/dev");
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if (!dir)
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bb_perror_msg("could not open '/dev'");
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else {
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while((entry = readdir(dir)) != NULL) {
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const char *myname = entry->d_name;
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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 (myname[0] == '.' && myname[1] == '.' && !myname[2])
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continue;
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#ifdef CONFIG_FEATURE_DEVFS
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/* if there is a link named /dev/root skip that too */
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if (strcmp(myname, "root")==0)
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continue;
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#endif
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fileName = concat_path_file("/dev", myname);
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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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break;
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free(fileName);
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fileName=NULL;
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}
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closedir(dir);
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}
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}
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if(fileName==NULL)
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fileName = bb_xstrdup("/dev/root");
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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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