Data_Connection_Protocol_Specification

Enumerations
enum	readingType { openR, readR, closeDISC, closeUA }
enum	writingType { trans_SET, writeR, trans_DISC_UA }

Functions
int	readingCycle (enum readingType type, int fd, unsigned char *c, unsigned char **dataBuf, int *retBufferSize)
	Function to read a byte from fd. More...
int	writeCycle (enum writingType type, int fd, unsigned char *buf, int bufsize)
	Function used to write to fd. More...
int	initConnection (int *fd, char *port)
	Estabelece ligação ao cabo e cria fd. More...
void	atende ()
	Função handler do sinal de alarme. More...
int	transmitter_SET (int fd)
	Função que envia Trama SET e recebe trama UA. More...
int	receiver_UA (int fd)
	Função que recebe trama SET e envia trama UA. More...
int	fillFinalBuffer (unsigned char *finalBuffer, unsigned char *headerBuf, unsigned char *footerBuf, int footerBufSize, unsigned char *dataBuffer, int dataSize)
	Stuffs the final buffer with the Information Packet. More...
int	transmitter_DISC_UA (int fd)
	Transmitter sequence to Disconnect. More...
int	receiver_DISC_UA (int fd)
	Receiver sequence to Disconnect. More...
void	generateErrorBCC2 (unsigned char *frame, int frameSize)
	Generates a error on BCC2 based on PROBABILITY_BCC2. More...
void	generateErrorBCC1 (unsigned int *checkBuffer)
	Generates a error on BCC based on PROBABILITY_BCC2. More...

Variables
int	testSend1 =0

Detailed Description

Enumeration Type Documentation

readingType

enum readingType

Enumerator
openR
readR
closeDISC
closeUA

writingType

enum writingType

Enumerator
trans_SET
writeR
trans_DISC_UA

Function Documentation

atende()

void atende

(

)

Função handler do sinal de alarme.

References DONE, failed, log_caution(), stateMachineParams::state, state_machine, and TRUE.

Referenced by llopen().

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fillFinalBuffer()

int fillFinalBuffer	(	unsigned char *	finalBuffer,
		unsigned char *	headerBuf,
		unsigned char *	footerBuf,
		int	footerBufSize,
		unsigned char *	dataBuffer,
		int	dataSize
	)

Stuffs the final buffer with the Information Packet.

Parameters

finalBuffer	pointer to the Information buffer
headerBuf	pointer to the header buffer [FLAG, A, C, BCC1]
footerBuf	pointer to the footer buffer [BCC2, FLAG]
footerBufSize	size of footer buffer
dataBuffer	pointer to the Data Buffer [D1, D2, ..., Dn]
dataSize	size of Data Buffer

Returns

int size of finalBuffer

Referenced by llwrite().

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generateErrorBCC1()

void generateErrorBCC1

(

unsigned int *

checkBuffer

)

Generates a error on BCC based on PROBABILITY_BCC2.

Parameters

checkBuffer

Buffer with Address Byte and Control Byte to generate error on

References checkBuffer, log_message(), and PROBABILITY_BCC1.

Referenced by processC_RCV().

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generateErrorBCC2()

void generateErrorBCC2	(	unsigned char *	frame,
		int	frameSize
	)

Generates a error on BCC2 based on PROBABILITY_BCC2.

Parameters

frame	frame to generate error on
frameSize	size of frame

References log_message(), and PROBABILITY_BCC2.

Referenced by processBCC_OK().

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initConnection()

int initConnection	(	int *	fd,
		char *	port
	)

Estabelece ligação ao cabo e cria fd.

Parameters

fd	file descriptor da ligação
port	"/dev/ttySx"

References ATTEMPTS, BAUDRATE, linkLayer::baudRate, log_error(), log_success(), linkLayer::numTransmissions, oldtio, linkLayer::port, linkLayer::sequenceNumber, TIME_OUT, and linkLayer::timeout.

Referenced by llopen().

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readingCycle()

int readingCycle	(	enum readingType	type,
		int	fd,
		unsigned char *	c,
		unsigned char **	dataBuf,
		int *	retBufferSize
	)

Function to read a byte from fd.

Parameters

type	variable to distinguish warning messages
fd	file descriptor
c	controll byte, used with type readR
dataBuf	buffer to read data, used with type readR
retBufferSize	variable to store dataBuf size, used with type readR

Returns

int

References C_REJ, C_RR, closeDISC, closeUA, DONE, FALSE, log_caution(), log_error(), openR, readR, linkLayer::sequenceNumber, stateMachineParams::state, state_machine, stateMachine(), and TRUE.

Referenced by llread(), receiver_DISC_UA(), and receiver_UA().

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receiver_DISC_UA()

int receiver_DISC_UA

(

int

fd

)

Receiver sequence to Disconnect.

Parameters

fd	file descriptor ot the connection

Returns

int -1 in case of errors, 0 otherwise

References A_ER, A_RE, BCC, C_DISC, C_UA, closeDISC, FLAG, log_error(), readingCycle(), Start, stateMachineSetUp(), SU_FRAME_SIZE, Supervision, and linkLayer::timeout.

Referenced by llclose().

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receiver_UA()

int receiver_UA

(

int

fd

)

Função que recebe trama SET e envia trama UA.

Parameters

fd	identificador da ligação de dados

Returns

int identificador da ligação de dados OU -1 em caso de erro

References A_ER, BCC, C_SET, C_UA, FLAG, log_error(), openR, readingCycle(), Start, stateMachineSetUp(), SU_FRAME_SIZE, and Supervision.

Referenced by llopen().

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transmitter_DISC_UA()

int transmitter_DISC_UA

(

int

fd

)

Transmitter sequence to Disconnect.

Parameters

fd	file descriptor ot the connection

Returns

int -1 in case of errors, 0 otherwise

References A_ER, A_RE, BCC, C_DISC, C_UA, failed, FLAG, log_error(), Start, stateMachineSetUp(), SU_FRAME_SIZE, Supervision, trans_DISC_UA, TRUE, and writeCycle().

Referenced by llclose().

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transmitter_SET()

int transmitter_SET

(

int

fd

)

Função que envia Trama SET e recebe trama UA.

Parameters

fd	identificador da ligação de dados

Returns

int identificador da ligação de dados OU -1 em caso de erro

References A_ER, BCC, C_SET, C_UA, failed, FLAG, log_error(), Start, stateMachineSetUp(), SU_FRAME_SIZE, Supervision, trans_SET, TRUE, and writeCycle().

Referenced by llopen().

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writeCycle()

int writeCycle	(	enum writingType	type,
		int	fd,
		unsigned char *	buf,
		int	bufsize
	)

Function used to write to fd.

Parameters

type	variable to distinguish warning messages
fd	file descriptor
buf	buffer of content to write
bufsize	lenght of buffer in bytes

Returns

int negative in case of errors, 0 otherwise

References DONE, failed, FALSE, log_caution(), log_error(), linkLayer::numTransmissions, Start, stateMachineParams::state, state_machine, stateMachine(), linkLayer::timeout, trans_DISC_UA, trans_SET, TRUE, and writeR.

Referenced by llwrite(), transmitter_DISC_UA(), and transmitter_SET().

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Variable Documentation

testSend1

int testSend1 =0