src/devNull.c File Reference

• null implementation.

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#include <syscall.h>

Include dependency graph for devNull.c:

Functions
static int	null_open (const char *path, int flags, int mode)
	Is not called for null.
static int	null_close (int fd)
	Is not called for null.
static int	null_write (int fd, const void *ptr, int len)
	Writes to null device.
static int	null_read (int fd, void *ptr, int len)
	Reads from the null uart.
Variables
const devoptab_t	null_devoptab
	null table

---

Detailed Description

• null implementation.

Prints will be all lost. The prints will be not shown to the user.

Author:

Rohan Kangralkar

Date:

04/05/2011

LastChange:

Id

devNull.c 1069 2013-02-25 18:19:21Z ovaskevi

---

Function Documentation

static int null_close

(

int

fd

)

[static]

Is not called for null.

Parameters:

fd

file descriptor

Returns:

negative for null

static int null_open	(	const char *	path,
		int	flags,
		int	mode
	)			[static]

Is not called for null.

Parameters:

	path	file to be opened
	flags	opening flags
	mode	opening mode

Returns:

failure for null

static int null_read	(	int	fd,
		void *	ptr,
		int	len
	)			[static]

Reads from the null uart.

Parameters:

	fd	file descriptor
	ptr	pointer to buffer where the read data will be placed
	len	length og the expected data

Returns:

number of char read

static int null_write	(	int	fd,
		const void *	ptr,
		int	len
	)			[static]

Writes to null device.

Parameters:

	fd	file descriptor
	ptr	pointer to the buffer to be tx
	len	length of data to be transfered

Returns:

number of bytes written.

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Variable Documentation

const devoptab_t null_devoptab

Initial value:

 { "null", null_open, null_close,
    null_write, null_read }

null table

---