1 files changed, 33 insertions, 0 deletions

diff --git a/libbb/find_root_device.c b/libbb/find_root_device.c
new file mode 100644
index 000000000..71b79b8d0
--- /dev/null
+++ b/libbb/find_root_device.c
@@ -0,0 +1,33 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+char *find_block_device(char *path)
+{
+        DIR *dir;
+        struct dirent *entry;
+        struct stat st;
+        dev_t dev;
+        char *retpath=NULL;
+
+        if(stat(path, &st) || !(dir = opendir("/dev"))) return NULL;
+        dev = (st.st_mode & S_IFMT) == S_IFBLK ? st.st_rdev : st.st_dev;
+        while((entry = readdir(dir)) != NULL) {
+                char devpath[PATH_MAX];
+                sprintf(devpath,"/dev/%s", entry->d_name);
+                if(!stat(devpath, &st) && S_ISBLK(st.st_mode) && st.st_rdev == dev) {
+                        retpath = xstrdup(devpath);
+                        break;
+                }
+        }
+        closedir(dir);
+
+        return retpath;
+}