devio.h File Reference

Device IO API. More...

#include "common.h"

Go to the source code of this file.

Data Structures
struct	devio_descriptor_t
	The device IO descriptor. More...

Macros
#define	DEVIO_DESC_MAGIC   (0x48435842u)
	Magic for device IO descriptor.
#define	DEVIO_DESC_INVALID   ((devio_descriptor_t *) 0xffffffff)
	Invalid descriptor.

Typedefs
typedef void	devio_backend_t
	Catchall device IO backend type.
typedef char	device_service_t[0x4c]

Functions
devio_descriptor_t *	CreateFile (const char *pathname, unsigned int access, unsigned int shmode, void *secattr, unsigned int on_noentry, unsigned int flags, void *template_file)
	Open or create a file/device by its pathname.
bool	ReadFile (devio_descriptor_t *devfd, void *buf, size_t size, size_t *actual_size, void *overlapped)
	Read/receive data from a device IO descriptor.
bool	WriteFile (devio_descriptor_t *devfd, const void *buf, size_t size, size_t *actual_size, void *overlapped)
	Write/send data to a device IO descriptor.
bool	DeviceIoControl (devio_descriptor_t *devfd, int request, const void *in, int inlen, void *out, int outlen, int *retlen, void *overlapped)
	Send an IOCTL request to a device IO descriptor devfd.
bool	CloseHandle (devio_descriptor_t *devfd)
	Close a device IO descriptor.

Detailed Description

Device IO API.

Macro Definition Documentation

DEVIO_DESC_INVALID

#define DEVIO_DESC_INVALID   ((devio_descriptor_t *) 0xffffffff)

Invalid descriptor.

This is usually returned by CreateFile() when an error occurred.

DEVIO_DESC_MAGIC

#define DEVIO_DESC_MAGIC   (0x48435842u)

Magic for device IO descriptor.

The value is ASCII "BXCH".

Typedef Documentation

devio_backend_t

typedef void devio_backend_t

Catchall device IO backend type.

Todo

Add more details.

Function Documentation

CloseHandle()

bool CloseHandle ( devio_descriptor_t * devfd )

extern

Close a device IO descriptor.

Analogous to the Windows CloseHandle() API.

Syscall Number

0x102ad

Parameters

devfd

Descriptor to close.

Return values

true	The operation was completed successfully.
false	The operation failed with error.

CreateFile()

devio_descriptor_t * CreateFile ( const char * pathname, unsigned int access, unsigned int shmode, void * secattr, unsigned int on_noentry, unsigned int flags, void * template_file )

extern

Open or create a file/device by its pathname.

Analogous to the Windows CreateFile() API.

Todo

Documentation on accepted arguments are mostly based on speculations at this moment. More details and through verifications needed.

Syscall Number

0x102a7

Parameters

pathname	DOS 8.3 path to the file to be opened.
access	Access flags.
shmode	File sharing mode. (?)
secattr	Seems to be ignored.
on_noentry	Behavior when entry does not exist. (?)
flags	Flags and attributes of the file. (?)
template_file	Seems to be ignored.

Returns

Device IO descriptor.

DeviceIoControl()

bool DeviceIoControl ( devio_descriptor_t * devfd, int request, const void * in, int inlen, void * out, int outlen, int * retlen, void * overlapped )

extern

Send an IOCTL request to a device IO descriptor devfd.

Analogous to the Windows DeviceIoControl() API.

Syscall Number

0x102ac

Parameters

devfd	Device IO descriptor.
request	IOCTL request type.
in	The input buffer, or NULL if not applicable.
inlen	The size of the input buffer in bytes.
out	The output buffer, or NULL if not applicable.
outlen	The size of the output buffer in bytes.
retlen	The size of returned data (if applicable).
overlapped	Probably ignored.

Return values

true	The operation was completed successfully.
false	The operation failed with error.

ReadFile()

bool ReadFile ( devio_descriptor_t * devfd, void * buf, size_t size, size_t * actual_size, void * overlapped )

extern

Read/receive data from a device IO descriptor.

Analogous to the Windows ReadFile() API.

Syscall Number

0x102a9

Parameters

	devfd	The device IO descriptor.
[out]	buf	Buffer to hold data read from the descriptor.
	size	Number of bytes to read.
[out]	actual_size	Number of bytes actually read.
	overlapped	Reserved.

Return values

true	The operation was completed successfully.
false	The operation failed with error.

WriteFile()

bool WriteFile ( devio_descriptor_t * devfd, const void * buf, size_t size, size_t * actual_size, void * overlapped )

extern

Write/send data to a device IO descriptor.

Analogous to the Windows WriteFile() API.

Syscall Number

0x102aa

Parameters

	devfd	The device IO descriptor.
[in]	buf	Buffer to hold data to be written to the descriptor.
	size	Number of bytes to write.
[out]	actual_size	Number of bytes actually written.
	overlapped	Reserved.

Return values

true	The operation was completed successfully.
false	The operation failed with error.