Line data    Source code

       1            0 : /*
       2              :  * Copyright (c) 2020 Tobias Svehagen
       3              :  *
       4              :  * SPDX-License-Identifier: Apache-2.0
       5              :  */
       6              : 
       7              : #ifndef ZEPHYR_INCLUDE_POSIX_SYS_EVENTFD_H_
       8              : #define ZEPHYR_INCLUDE_POSIX_SYS_EVENTFD_H_
       9              : 
      10              : #include <zephyr/zvfs/eventfd.h>
      11              : 
      12              : #ifdef __cplusplus
      13              : extern "C" {
      14              : #endif
      15              : 
      16            0 : #define EFD_SEMAPHORE ZVFS_EFD_SEMAPHORE
      17            0 : #define EFD_NONBLOCK  ZVFS_EFD_NONBLOCK
      18              : 
      19            0 : typedef zvfs_eventfd_t eventfd_t;
      20              : 
      21              : /**
      22              :  * @brief Create a file descriptor for event notification
      23              :  *
      24              :  * The returned file descriptor can be used with POSIX read/write calls or
      25              :  * with the eventfd_read/eventfd_write functions.
      26              :  *
      27              :  * It also supports polling and by including an eventfd in a call to poll,
      28              :  * it is possible to signal and wake the polling thread by simply writing to
      29              :  * the eventfd.
      30              :  *
      31              :  * When using read() and write() on an eventfd, the size must always be at
      32              :  * least 8 bytes or the operation will fail with EINVAL.
      33              :  *
      34              :  * @return New eventfd file descriptor on success, -1 on error
      35              :  */
      36            1 : int eventfd(unsigned int initval, int flags);
      37              : 
      38              : /**
      39              :  * @brief Read from an eventfd
      40              :  *
      41              :  * If call is successful, the value parameter will have the value 1
      42              :  *
      43              :  * @param fd File descriptor
      44              :  * @param value Pointer for storing the read value
      45              :  *
      46              :  * @return 0 on success, -1 on error
      47              :  */
      48            1 : int eventfd_read(int fd, eventfd_t *value);
      49              : 
      50              : /**
      51              :  * @brief Write to an eventfd
      52              :  *
      53              :  * @param fd File descriptor
      54              :  * @param value Value to write
      55              :  *
      56              :  * @return 0 on success, -1 on error
      57              :  */
      58            1 : int eventfd_write(int fd, eventfd_t value);
      59              : 
      60              : #ifdef __cplusplus
      61              : }
      62              : #endif
      63              : 
      64              : #endif /* ZEPHYR_INCLUDE_POSIX_SYS_EVENTFD_H_ */