diff --git a/modules/core/src/esp_dirent.h b/modules/core/src/esp_dirent.h
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+++ b/modules/core/src/esp_dirent.h
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+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+/**
+ * This header file provides POSIX-compatible definitions of directory
+ * access functions and related data types.
+ * See http://pubs.opengroup.org/onlinepubs/7908799/xsh/dirent.h.html
+ * for reference.
+ */
+
+/**
+ * @brief Opaque directory structure
+ */
+typedef struct {
+    uint16_t dd_vfs_idx; /*!< VFS index, not to be used by applications */
+    uint16_t dd_rsv;     /*!< field reserved for future extension */
+    /* remaining fields are defined by VFS implementation */
+} DIR;
+
+/**
+ * @brief Directory entry structure
+ */
+struct dirent {
+    int d_ino;          /*!< file number */
+    uint8_t d_type;     /*!< not defined in POSIX, but present in BSD and Linux */
+#define DT_UNKNOWN  0
+#define DT_REG      1
+#define DT_DIR      2
+    char d_name[256];   /*!< zero-terminated file name */
+};
+
+DIR* opendir(const char* name);
+struct dirent* readdir(DIR* pdir);
+long telldir(DIR* pdir);
+void seekdir(DIR* pdir, long loc);
+void rewinddir(DIR* pdir);
+int closedir(DIR* pdir);
+int readdir_r(DIR* pdir, struct dirent* entry, struct dirent** out_dirent);
+