mirror of
https://github.com/espressif/esp-idf.git
synced 2025-10-31 13:09:38 +00:00
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
// Copyright 2021 Espressif Systems (Shanghai) CO 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 <sys/types.h>
|
|
|
|
#include "esp_err.h"
|
|
|
|
#define EFD_SUPPORT_ISR (1 << 4)
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* @brief Eventfd vfs initialization settings
|
|
*/
|
|
typedef struct {
|
|
size_t max_fds; /*!< The maxinum number of eventfds supported */
|
|
} esp_vfs_eventfd_config_t;
|
|
|
|
#define ESP_VFS_EVENTD_CONFIG_DEFAULT() (esp_vfs_eventfd_config_t) { \
|
|
.max_fds = 5, \
|
|
};
|
|
|
|
/**
|
|
* @brief Registers the event vfs.
|
|
*
|
|
* @return ESP_OK if successful, ESP_ERR_NO_MEM if too many VFSes are
|
|
* registered.
|
|
*/
|
|
esp_err_t esp_vfs_eventfd_register(const esp_vfs_eventfd_config_t *config);
|
|
|
|
/**
|
|
* @brief Unregisters the event vfs.
|
|
*
|
|
* @return ESP_OK if successful, ESP_ERR_INVALID_STATE if VFS for given prefix
|
|
* hasn't been registered
|
|
*/
|
|
esp_err_t esp_vfs_eventfd_unregister(void);
|
|
|
|
/*
|
|
* @brief Creates an event file descirptor.
|
|
*
|
|
* The behavior of read, write and select is the same as man(2) eventfd with
|
|
* EFD_SEMAPHORE **NOT** specified. A new flag EFD_SUPPORT_ISR has been added.
|
|
* This flag is required to write to event fds in interrupt handlers. Accessing
|
|
* the control blocks of event fds with EFD_SUPPORT_ISR will cause interrupts to
|
|
* be temporarily blocked (e.g. during read, write and beginning and ending of
|
|
* the * select).
|
|
*
|
|
* @return The file descriptor if successful, -1 if error happens.
|
|
*/
|
|
int eventfd(unsigned int initval, int flags);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|