Device
[MySQL FS Deamon]

Classes
struct	read_dir_item
declaration of functions for communication with char device
int	fsd_chardevice_open ()
	Open connection to FSC device.
int	fsd_chardevice_close (int fsc_device)
	Release device.
int	fsd_chardevice_read (int fsc_device, char *buffer)
	Read message from device.
int	fsd_chardevice_write (int fsc_device, const char *data, int count)
	Write message to device.
constants for symbols for commands
#define	TEST   "TS"
#define	CREATE   "CF"
#define	MKDIR   "MD"
#define	CLEAR_FILE   "CR"
#define	ADD_BLOCK   "AB"
#define	REMOVE_FILE   "RF"
#define	REMOVE_DIR   "RD"
#define	GET_BLOCK   "GB"
#define	LOOKUP   "LU"
#define	READ_DIR   "RE"
#define	FILE_INFO   "FI"
#define	DIR_INFO   "DI"
#define	READ_INODE   "RI"
#define	CMD_OK   "OK"
#define	CMD_ER   "ER"
#define	REPLACE_BLOCK   "RB"
#define	MOVE_FILE   "MV"
#define	RENAME_FILE   "DN"
#define	RENAME_DIR   "DD"
#define	TRUNCATE_FILE   "TR"
#define	APPEND_FILE   "AP"
constants for numbers of commands
#define	UNKNOWN_COMMAND_NR   1000
#define	TEST_NR   1001
#define	CREATE_NR   1002
#define	MKDIR_NR   1003
#define	CLEAR_FILE_NR   1004
#define	ADD_BLOCK_NR   1005
#define	REMOVE_FILE_NR   1006
#define	REMOVE_DIR_NR   1007
#define	GET_BLOCK_NR   1008
#define	LOOKUP_NR   1009
#define	READ_DIR_NR   1010
#define	CMD_OK_NR   1011
#define	CMD_ER_NR   1012
#define	DIR_INFO_NR   1013
#define	FILE_INFO_NR   1014
#define	READ_INODE_NR   1015
#define	REPLACE_BLOCK_NR   1016
#define	MOVE_FILE_NR   1017
#define	RENAME_FILE_NR   1018
#define	TRUNCATE_FILE_NR   1019
#define	RENAME_DIR_NR   1020
constants for restrictions of length
#define	MAX_NAME_LENGTH   64
#define	MAX_ID_LENGTH   11
#define	MAX_SIZE_LENGTH   11
#define	MAX_VERSION_LENGTH   10
#define	MAX_COMMAND_LENGTH   3
#define	MAX_PARAM_LENGTH   64
#define	MAX_BLOCK_LENGTH   4096
#define	MAX_MESSAGE_LENGTH   5192
#define	MAX_QUERY_LENGTH   300
constants for connection to char device
#define	CHAR_DEVICE_NAME   "fsc_dev"
#define	FSC_DEVICE_LOCATION   "/dev/fsc_dev"
constants for functions return values
#define	DEFINITION_BASE   100
#define	IS_FILE   (+ (DEFINITION_BASE + 6))
#define	IS_DIR   (+ (DEFINITION_BASE + 7))
#define	OK   (+ (DEFINITION_BASE + 8))
#define	ENAME_NOT_EXISTS   (- (DEFINITION_BASE + 11))
#define	EINODE_NOT_EXISTS   (- (DEFINITION_BASE + 11))
#define	EDB_ERROR   (- (DEFINITION_BASE + 1))
#define	ENAME_EXISTS   (- (DEFINITION_BASE + 3))
#define	EDIR_NOT_EXISTS   (- (DEFINITION_BASE + 2))
#define	EDIR_IS_NOT_EMPTY   (- (DEFINITION_BASE + 4))
#define	EBLOCK_NOT_EXISTS   (- (DEFINITION_BASE + 5))
#define	EFILE_NOT_EXISTS   (- (DEFINITION_BASE + 9))
#define	EDB_CONNECT_ERROR   (- (DEFINITION_BASE + 10))
#define	EFSC_DEVICE_OPEN_ERROR   (- (DEFINITION_BASE + 12))
#define	EFSC_DEVICE_NOT_OPEN   (- (DEFINITION_BASE + 13))
#define	EGENERAL_ERROR   (- (DEFINITION_BASE + 14))
#define	EPROTOKOL_VERSION_ERROR   (- (DEFINITION_BASE + 15))
#define	EDIR_NAME_NOT_EXISTS   (- (DEFINITION_BASE + 16))
#define	EFILE_NAME_NOT_EXISTS   (- (DEFINITION_BASE + 17))
#define	EPARENT_NOT_EXISTS   (- (DEFINITION_BASE + 18))
Defines
#define	FSD_VERSION   "MYSQL1.1"
Typedefs
typedef read_dir_item	rd_item

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Detailed Description

This file contents declaration of functions which provide connection to char device and communication with it.

This file contents declaration of functions which provide connection to char device and communication with it.

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Define Documentation

#define FSD_VERSION   "MYSQL1.1"

definition of version of communication protocol

Definition at line 19 of file fsd_defines.h.

Referenced by fsd_write_message(), main(), and parse_message().

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Typedef Documentation

typedef struct read_dir_item rd_item

See also:

read_dir_item

Definition at line 156 of file fsd_defines.h.

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Function Documentation

int fsd_chardevice_close

(

int

fsc_device

)

Release device.

Close connection to device.

Parameters:

fsc_device

Open char device file descriptor.

Returns:

Close function error code.

Definition at line 53 of file fsd_device.c.

Referenced by exit_deamon().

int fsd_chardevice_open

(

)

Open connection to FSC device.

This function opens connection to FSC device. The path to the device is defined in FSC_DEVICE_LOCATION.

Returns:

Positive integer value on success, zero or negative integer else. Value -EBUSY is returned on attempt to open the char device when already opened.

Definition at line 39 of file fsd_device.c.

References FSC_DEVICE_LOCATION.

Referenced by main().

int fsd_chardevice_read	(	int	fsc_device,
		char *	buffer
	)

Read message from device.

Read string from char_device.

Parameters:

	fsc_device	Device to be read from.
	buffer	Data buffer, storage for read message.

Returns:

Number of read chars, error code of read function else.

Definition at line 67 of file fsd_device.c.

References EFSC_DEVICE_NOT_OPEN, MAX_MESSAGE_LENGTH, PDEBUG, and result.

Referenced by main().

int fsd_chardevice_write	(	int	fsc_device,
		const char *	data,
		int	count
	)

Write message to device.

Write buffer content into FSC device. Number of chars in the buffer must be specified.

Parameters:

	fsc_device	Device to be writen to.
	data	Buffer containing the message.
	count	Number of characters in the buffer.

Returns:

Number of written characters.

Definition at line 99 of file fsd_device.c.

References EFSC_DEVICE_NOT_OPEN, PDEBUG, and result.

Referenced by fsd_write_message().

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