server.c

#include<stdio.h>
#include<string.h>	//strlen
#include<sys/socket.h>
#include<arpa/inet.h>	//inet_addr
#include<unistd.h>	//write


int main(int argc , char *argv[])
{
	int socket_desc, socket_desc1, client_sock , c , read_size;
	struct sockaddr_in server_recv, server_send , client;
	char client_message[512];

	//Create socket
	socket_desc = socket(AF_INET , SOCK_STREAM , 0);
	if (socket_desc == -1)
	{
		printf("Could not create socket");
	}
	puts("Socket created");

	//Prepare the sockaddr_in structure
	server_recv.sin_family = AF_INET;
    inet_pton(AF_INET, "192.168.0.100", &(server_recv.sin_addr));
	server_recv.sin_port = htons(51000);

    server_send.sin_family = AF_INET;
    inet_pton(AF_INET, "192.168.0.100", &(server_send.sin_addr));
	server_send.sin_port = htons(51500);

	//Bind
	if( bind(socket_desc,(struct sockaddr *)&server_recv , sizeof(server_recv)) < 0)
	{		//print the error message
		perror("bind failed. Error");
		return 1;
	}
	puts("bind done");

    if( bind(socket_desc1,(struct sockaddr *)&server_send , sizeof(server_send)) < 0)
	{		//print the error message
		perror("bind failed. Error");
		return 1;
	}
	puts("bind done");

	//Listen
	listen(socket_desc , 3);
    listen(socket_desc1 , 3);

	//Accept and incoming connection
	puts("Waiting for incoming connections...");
	c = sizeof(struct sockaddr_in);

	//accept connection from an incoming client
	client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c);
	if (client_sock < 0)
	{		perror("accept failed");
		return 1;
	}
	puts("Connection accepted");

	//Receive a message from client
	while( (read_size = recv(client_sock , client_message , 512 , 0)) > 0 )
	{
		//Send the message back to client
		write(client_sock , client_message , strlen(client_message));
	}

	if(read_size == 0)
	{
		puts("Client disconnected");
		fflush(stdout);
	}
	else if(read_size == -1)
	{
		perror("recv failed");
	}

	return 0;
}