1 files changed, 89 insertions, 0 deletions
diff --git a/busybox/libbb/find_root_device.c b/busybox/libbb/find_root_device.c
new file mode 100644
index 0000000..2600ce5
--- /dev/null
+++ b/busybox/libbb/find_root_device.c
@@ -0,0 +1,89 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include "libbb.h"
+
+
+
+extern char *find_real_root_device_name(void)
+{
+	DIR *dir;
+	struct dirent *entry;
+	struct stat statBuf, rootStat;
+	char *fileName = NULL;
+	dev_t dev;
+
+	if (stat("/", &rootStat) != 0)
+		bb_perror_msg("could not stat '/'");
+	else {
+		/* This check is here in case they pass in /dev name */
+		if ((rootStat.st_mode & S_IFMT) == S_IFBLK)
+			dev = rootStat.st_rdev;
+		else
+			dev = rootStat.st_dev;
+
+		dir = opendir("/dev");
+		if (!dir)
+			bb_perror_msg("could not open '/dev'");
+		else {
+			while((entry = readdir(dir)) != NULL) {
+				const char *myname = entry->d_name;
+				/* Must skip ".." since that is "/", and so we
+				 * would get a false positive on ".."  */
+				if (myname[0] == '.' && myname[1] == '.' && !myname[2])
+					continue;
+#ifdef CONFIG_FEATURE_DEVFS
+				/* if there is a link named /dev/root skip that too */
+				if (strcmp(myname, "root")==0)
+					continue;
+#endif
+				fileName = concat_path_file("/dev", myname);
+
+				/* Some char devices have the same dev_t as block
+				 * devices, so make sure this is a block device */
+				if (stat(fileName, &statBuf) == 0 &&
+						S_ISBLK(statBuf.st_mode)!=0 &&
+						statBuf.st_rdev == dev)
+					break;
+				free(fileName);
+				fileName=NULL;
+			}
+			closedir(dir);
+		}
+	}
+	if(fileName==NULL)
+		fileName = bb_xstrdup("/dev/root");
+	return fileName;
+}
+
+
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/