There is a simple, cross platform way and a correct way. Unfortunately, the simple way is also probably the worst way to do it. Simple, cross platform way: void Wait( int NumberOfSeconds ) timet StartTime = time( NULL ); while(( time(.
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Stop – and – Wait protocol is data link layer protocol for transmission of frames over noiseless channels. It provides unidirectional data transmission with flow control facilities but without error control facilities.
This protocol takes into account the fact that the receiver has a finite processing speed. If data frames arrive at the receiver’s end at a rate which is greater than its rate of processing, frames be dropped out. In order to avoid this, the receiver sends an acknowledgement for each frame upon its arrival. The sender sends the next frame only when it has received a positive acknowledgement from the receiver that it is available for further data processing.
Design
- Sender Site: The data link layer in the sender site waits for the network layer for a data packet. It then checks whether it can send the frame. If it receives a positive notification from the physical layer, it makes frames out of the data and sends it. It then waits for an acknowledgement before sending the next frame.
- Receiver Site: The data link layer in the receiver site waits for a frame to arrive. When it arrives, the receiver processes it and delivers it to the network layer. It then sends an acknowledgement back to the sender.
Sender Site Algorithm of Simplex Stop – and – Wait Protocol for Noiseless Channel
Receiver Site Algorithm of Simplex Stop – and – Wait Protocol for Noiseless Channel
Flow Diagram
The following flow diagram depicts communication via simplex stop – and – wait protocol for noiseless channel:
SENDER.C
// ARQ - client server
// sender.c
//connection if he ready to receive else wait
// till he does not ready or timeout fails .
/*server.c and client.c - implementation of go-back-n ARQ in C
Server.c implements a reliable data transfer over UDP in C
client.c implements a reliable data transfer client over UDP in C
Both of these programs use the go-back-n ARQ, that is lost data is
automatically resent. These programs are hardcoded to transfer
to compile:
gcc -o server server.c
gcc -o client client.c
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#define MAXLINE 80
char buffer[255] ;
#define SERVER_ADDR '127.0.0.1'
#define SERVER_PORT_NUM 6000
#define t_max_retransmission 3
typedef int bit_32_var ;
typedef char bit_8_var ;
// ARQ - client server
// sender.c
//connection if he ready to receive else wait
// till he does not ready or timeout fails .
/*server.c and client.c - implementation of go-back-n ARQ in C
Server.c implements a reliable data transfer over UDP in C
client.c implements a reliable data transfer client over UDP in C
Both of these programs use the go-back-n ARQ, that is lost data is
automatically resent. These programs are hardcoded to transfer
to compile:
gcc -o server server.c
gcc -o client client.c
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#define MAXLINE 80
char buffer[255] ;
#define SERVER_ADDR '127.0.0.1'
#define SERVER_PORT_NUM 6000
#define t_max_retransmission 3
typedef int bit_32_var ;
typedef char bit_8_var ;
typedef struct pdu_field
{
bit_32_var SN ;
bit_8_var data[MAXLINE] ;
bit_8_var status ;
}PDU_FIELD;
void str_cli ( FILE *fp , bit_32_var sfd )
{
bit_32_var SN ;
bit_8_var data[MAXLINE] ;
bit_8_var status ;
}PDU_FIELD;
void str_cli ( FILE *fp , bit_32_var sfd )
{
bit_32_var no_of_data , counter_1 , counter_2 ;
static bit_32_var retransmission_counter , intial_readycheck_counter ;
PDU_FIELD send_data[MAXLINE] ,recv_data[MAXLINE] ;
printf ( 'enter how many data you have to send : ' ) ;
scanf ( '%d', &no_of_data ) ;
for ( counter_1 = 0 ; counter_1 < no_of_data ; counter_1++ )
{
printf ( 'enter %d'th data : ',counter_1 ) ;
scanf ( '%s', send_data[counter_1].data ) ;
send_data[counter_1].SN = counter_1 ;
send_data[counter_1].status = 0 ;
}
static bit_32_var retransmission_counter , intial_readycheck_counter ;
PDU_FIELD send_data[MAXLINE] ,recv_data[MAXLINE] ;
printf ( 'enter how many data you have to send : ' ) ;
scanf ( '%d', &no_of_data ) ;
for ( counter_1 = 0 ; counter_1 < no_of_data ; counter_1++ )
{
printf ( 'enter %d'th data : ',counter_1 ) ;
scanf ( '%s', send_data[counter_1].data ) ;
send_data[counter_1].SN = counter_1 ;
send_data[counter_1].status = 0 ;
}
for ( counter_1 = 0 ; counter_1 < no_of_data ; counter_1++ )
{
write ( sfd , &send_data[counter_1] , sizeof ( send_data[counter_1] ) ) ;
read ( sfd , &recv_data[counter_1] , sizeof ( recv_data[counter_1] ) ) ;
{
write ( sfd , &send_data[counter_1] , sizeof ( send_data[counter_1] ) ) ;
read ( sfd , &recv_data[counter_1] , sizeof ( recv_data[counter_1] ) ) ;
}
write ( sfd , 'Nothingtotransmit:n' , 10 ) ;
printf ( 'Transmission finished : n' ) ;
exit ( 1 ) ;
}
printf ( 'Transmission finished : n' ) ;
exit ( 1 ) ;
}
int main ()
{
bit_32_var socket_fd ;
struct sockaddr_in config_client ;
struct sockaddr_in config_client ;
socket_fd = socket ( AF_INET , SOCK_STREAM , 0 ) ;
if ( socket_fd < 0 )
{
printf ( 'client : failed to create socket n' ) ;
exit ( 1 ) ;
}
{
printf ( 'client : failed to create socket n' ) ;
exit ( 1 ) ;
}
}
RECEIVE.C
// ARQ - client server
// Stop & Wait basics
// receive.c
// written at asmaitha wireless
// contact - [email protected]
/*server.c and client.c - implementation of go-back-n ARQ in C
by Elijah Jordan Montgomery [email protected]
// Stop & Wait basics
// receive.c
// written at asmaitha wireless
// contact - [email protected]
/*server.c and client.c - implementation of go-back-n ARQ in C
by Elijah Jordan Montgomery [email protected]
Server.c implements a reliable data transfer over UDP in C
client.c implements a reliable data transfer client over UDP in C
client.c implements a reliable data transfer client over UDP in C
Both of these programs use the go-back-n ARQ, that is lost data is
automatically resent. These programs are hardcoded to transfer
to compile:
automatically resent. These programs are hardcoded to transfer
to compile:
gcc -o server server.c
gcc -o client client.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#define SUCCESS 1
#define FAILURE 0
#define NO_OF_FRAMES 10
typedef int BIT_32_VAR_INT ;
typedef char BIT_8_VAR_CHAR ;
void error ( BIT_8_VAR_CHAR *msg )
{
perror ( msg ) ;
exit ( 1 ) ;
gcc -o client client.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#define SUCCESS 1
#define FAILURE 0
#define NO_OF_FRAMES 10
typedef int BIT_32_VAR_INT ;
typedef char BIT_8_VAR_CHAR ;
void error ( BIT_8_VAR_CHAR *msg )
{
perror ( msg ) ;
exit ( 1 ) ;
}
typedef struct pdu_data
{
BIT_32_VAR_INT SN ;
BIT_8_VAR_CHAR data[80] ;
BIT_32_VAR_INT status ;
}PDU_DATA;
typedef struct pdu_data
{
BIT_32_VAR_INT SN ;
BIT_8_VAR_CHAR data[80] ;
BIT_32_VAR_INT status ;
}PDU_DATA;
int main () {
}
return 0 ;
return 0 ;
}