feat(vfs): Bring vfs from esp-idf

Commit ID: e1e82c89

components/esp8266/include/driver/uart_select.h

@@ -0,0 +1,49 @@
+
+// Copyright 2018 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.
+
+#ifndef _UART_SELECT_H_
+#define _UART_SELECT_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "driver/uart.h"
+
+typedef enum {
+    UART_SELECT_READ_NOTIF,
+    UART_SELECT_WRITE_NOTIF,
+    UART_SELECT_ERROR_NOTIF,
+} uart_select_notif_t;
+
+typedef void (*uart_select_notif_callback_t)(uart_port_t uart_num, uart_select_notif_t uart_select_notif, BaseType_t *task_woken);
+
+/**
+ * @brief Set notification callback function for select() events
+ * @param uart_num UART port number
+ * @param uart_select_notif_callback callback function
+ */
+void uart_set_select_notif_callback(uart_port_t uart_num, uart_select_notif_callback_t uart_select_notif_callback);
+
+/**
+ * @brief Get mutex guarding select() notifications
+ */
+portMUX_TYPE *uart_get_selectlock();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //_UART_SELECT_H_