misc/ismount.c

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00001 // Copyright (C) 2006-2007 Benedikt Böhm <hollow@gentoo.org>
00002 //
00003 // This program is free software; you can redistribute it and/or
00004 // modify it under the terms of the GNU General Public License
00005 // as published by the Free Software Foundation; either version 2
00006 // of the License, or (at your option) any later version.
00007 //
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 //
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the Free Software
00015 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
00016 
00017 #include <sys/stat.h>
00018 
00019 #include "mem.h"
00020 #include "misc.h"
00021 #include "str.h"
00022 
00023 int ismount(const char *path)
00024 {
00025         struct stat sb_path, sb_parent;
00026         int rc = 1;
00027 
00028         if (str_isempty(path))
00029                 return 0;
00030 
00031         if (str_equal(path, "/"))
00032                 return 1;
00033 
00034         char *parent = str_path_dirname(path);
00035 
00036         if (lstat(path, &sb_path) == -1 ||
00037                         !S_ISDIR(sb_path.st_mode) ||
00038                         lstat(parent, &sb_parent) == -1 ||
00039                         sb_path.st_dev == sb_parent.st_dev)
00040                 rc = 0;
00041 
00042         mem_free(parent);
00043         return rc;
00044 }

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