#include <stdint.h>
#include <zephyr/kernel.h>

Macros
#define	ZVFS_EFD_SEMAPHORE 2

#define	ZVFS_EFD_NONBLOCK 0x4000

Typedefs
typedef uint64_t	zvfs_eventfd_t

Functions
int	zvfs_eventfd (unsigned int initval, int flags)
	Create a file descriptor for ZVFS event notification.

int	zvfs_eventfd_read (int fd, zvfs_eventfd_t *value)
	Read from a ZVFS eventfd.

int	zvfs_eventfd_write (int fd, zvfs_eventfd_t value)
	Write to a ZVFS eventfd.

Macro Definition Documentation

◆ ZVFS_EFD_NONBLOCK

#define ZVFS_EFD_NONBLOCK 0x4000

◆ ZVFS_EFD_SEMAPHORE

#define ZVFS_EFD_SEMAPHORE 2

Typedef Documentation

◆ zvfs_eventfd_t

typedef uint64_t zvfs_eventfd_t

Function Documentation

◆ zvfs_eventfd()

int zvfs_eventfd	(	unsigned int	initval,
		int	flags
	)

Create a file descriptor for ZVFS event notification.

The returned file descriptor can be used with POSIX read/write calls or with the zvfs_eventfd_read or zvfs_eventfd_write functions.

It also supports polling and by including an eventfd in a call to poll, it is possible to signal and wake the polling thread by simply writing to the eventfd.

When using read() and write() on a ZVFS eventfd, the size must always be at least 8 bytes or the operation will fail with EINVAL.

Returns: New ZVFS eventfd file descriptor on success, -1 on error

◆ zvfs_eventfd_read()

int zvfs_eventfd_read	(	int	fd,
		zvfs_eventfd_t *	value
	)

Read from a ZVFS eventfd.

If call is successful, the value parameter will have the value 1

Parameters

fd	File descriptor
value	Pointer for storing the read value

Returns: 0 on success, -1 on error

◆ zvfs_eventfd_write()

int zvfs_eventfd_write	(	int	fd,
		zvfs_eventfd_t	value
	)

Write to a ZVFS eventfd.