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path: root/i/pc104/initrd/conf/busybox/libbb/find_root_device.c
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Diffstat (limited to 'i/pc104/initrd/conf/busybox/libbb/find_root_device.c')
-rw-r--r--i/pc104/initrd/conf/busybox/libbb/find_root_device.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/libbb/find_root_device.c b/i/pc104/initrd/conf/busybox/libbb/find_root_device.c
new file mode 100644
index 0000000..ea360ea
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/libbb/find_root_device.c
@@ -0,0 +1,34 @@
+/* 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(const 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;
+}