lkl: add lkl_fdopendir and lkl_rewinddir

Signed-off-by: Michael Zimmermann <sigmaepsilon92@gmail.com>

tools/lkl/include/lkl.h

@@ -163,6 +163,22 @@ long lkl_umount_timeout(char *path, int flags, long timeout_ms);
  */
 struct lkl_dir *lkl_opendir(const char *path, int *err);
 
+/**
+ * lkl_fdopendir - open a directory
+ *
+ * @fd - file descriptor
+ * @err - pointer to store the error in case of failure
+ * @returns - a handle to be used when calling lkl_readdir
+ */
+struct lkl_dir *lkl_fdopendir(int fd, int *err);
+
+/**
+ * lkl_rewinddir - reset directory stream
+ *
+ * @dir - the directory handler as returned by lkl_opendir
+ */
+void lkl_rewinddir(struct lkl_dir *dir);
+
 /**
  * lkl_closedir - close the directory
  *

tools/lkl/lib/fs.c

@@ -254,7 +254,7 @@ struct lkl_dir {
 	int len;
 };
 
-struct lkl_dir *lkl_opendir(const char *path, int *err)
+static struct lkl_dir *lkl_dir_alloc(int *err)
 {
 	struct lkl_dir *dir = lkl_host_ops.mem_alloc(sizeof(struct lkl_dir));
 
@@ -263,19 +263,48 @@ struct lkl_dir *lkl_opendir(const char *path, int *err)
 		return NULL;
 	}
 
+	dir->len = 0;
+	dir->pos = NULL;
+
+	return dir;
+}
+
+struct lkl_dir *lkl_opendir(const char *path, int *err)
+{
+	struct lkl_dir *dir = lkl_dir_alloc(err);
+
+	if (!dir)
+		return NULL;
+
 	dir->fd = lkl_sys_open(path, LKL_O_RDONLY | LKL_O_DIRECTORY, 0);
 	if (dir->fd < 0) {
 		*err = dir->fd;
 		lkl_host_ops.mem_free(dir);
 		return NULL;
 	}
 
-	dir->len = 0;
-	dir->pos = NULL;
+	return dir;
+}
+
+struct lkl_dir *lkl_fdopendir(int fd, int *err)
+{
+	struct lkl_dir *dir = lkl_dir_alloc(err);
+
+	if (!dir)
+		return NULL;
+
+	dir->fd = fd;
 
 	return dir;
 }
 
+void lkl_rewinddir(struct lkl_dir *dir)
+{
+	lkl_sys_lseek(dir->fd, 0, SEEK_SET);
+	dir->len = 0;
+	dir->pos = NULL;
+}
+
 int lkl_closedir(struct lkl_dir *dir)
 {
 	int ret;