feat(usb_cdc): Add select functionality

components/esp_system/include/esp_private/esp_vfs_cdcacm_select.h

@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include "freertos/FreeRTOS.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+    CDCACM_SELECT_READ_NOTIF,
+    CDCACM_SELECT_WRITE_NOTIF,
+    CDCACM_SELECT_ERROR_NOTIF,
+} cdcacm_select_notif_t;
+
+typedef void (*cdcacm_select_notif_callback_t)(cdcacm_select_notif_t cdcacm_select_notif, BaseType_t *task_woken);
+
+/**
+ * @brief Set notification callback function for select() events
+ * @param cdcacm_select_notif_callback callback function
+ */
+void cdcacm_set_select_notif_callback(cdcacm_select_notif_callback_t cdcacm_select_notif_callback);
+
+#ifdef __cplusplus
+}
+#endif

components/esp_system/include/esp_private/usb_console.h

@@ -1,3 +1,4 @@
+
 /*
  * SPDX-FileCopyrightText: 2019-2025 Espressif Systems (Shanghai) CO LTD
  *
@@ -99,6 +100,15 @@ esp_err_t esp_usb_console_set_cb(esp_usb_console_cb_t rx_cb, esp_usb_console_cb_
  */
 void esp_usb_console_poll_interrupts(void); // [refactor-todo] Remove when implementing IDF-12175
 
+/**
+ * @brief Checks whether the USB console is installed or not
+ *
+ * @return
+ *     - true  USB console is installed
+ *     - false USB console is not installed
+ */
+bool esp_usb_console_is_installed(void);
+
 #ifdef __cplusplus
 }
 #endif