kopia lustrzana https://github.com/espressif/esp-idf
64 wiersze
1.5 KiB
C
64 wiersze
1.5 KiB
C
/*
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* SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include <stddef.h>
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#include <sys/types.h>
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#include "esp_err.h"
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#define EFD_SUPPORT_ISR (1 << 4)
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Eventfd vfs initialization settings
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*/
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typedef struct {
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size_t max_fds; /*!< The maximum number of eventfds supported */
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} esp_vfs_eventfd_config_t;
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#define ESP_VFS_EVENTD_CONFIG_DEFAULT() (esp_vfs_eventfd_config_t) { \
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.max_fds = 5, \
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};
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/**
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* @brief Registers the event vfs.
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*
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* @return ESP_OK if successful, ESP_ERR_NO_MEM if too many VFSes are
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* registered.
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*/
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esp_err_t esp_vfs_eventfd_register(const esp_vfs_eventfd_config_t *config);
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/**
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* @brief Unregisters the event vfs.
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*
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* @return ESP_OK if successful, ESP_ERR_INVALID_STATE if VFS for given prefix
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* hasn't been registered
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*/
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esp_err_t esp_vfs_eventfd_unregister(void);
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/*
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* @brief Creates an event file descriptor.
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*
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* The behavior of read, write and select is the same as man(2) eventfd with
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* EFD_SEMAPHORE **NOT** specified. A new flag EFD_SUPPORT_ISR has been added.
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* This flag is required to write to event fds in interrupt handlers. Accessing
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* the control blocks of event fds with EFD_SUPPORT_ISR will cause interrupts to
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* be temporarily blocked (e.g. during read, write and beginning and ending of
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* the * select).
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*
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* @return The file descriptor if successful, -1 if error happens.
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*/
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int eventfd(unsigned int initval, int flags);
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#ifdef __cplusplus
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}
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#endif
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