TCPServer.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <termios.h>

int main(int argc,char *argv[])
{
    int sockfd,newsockfd,portno,clilen,n,slen,pid;
    char buffer[256],c[200];
    char fname[20];
    
    struct sockaddr_in serv_addr,cli_addr;
    FILE *fptr;
    printf("\nThis is server \n\n");
    printf("\nEnter server port number : ");
    scanf("%d",&portno);
        
    sockfd=socket(AF_INET,SOCK_STREAM,0);
    bzero((char *)&serv_addr,sizeof(serv_addr));
    serv_addr.sin_family=AF_INET;
    serv_addr.sin_addr.s_addr=INADDR_ANY;
    serv_addr.sin_port=htons(portno);

    int x = bind(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr));
    printf("\nNow server is up and is wating for client to connect: \n\n");
    
    listen(sockfd,5);
    clilen=sizeof(cli_addr);
    
    newsockfd=accept(sockfd,(struct sockaddr *)&cli_addr,&clilen);
    printf("\n New client requested it sockfd  =  %d",newsockfd);
    close(sockfd);
    bzero(buffer,20);
    strcpy(buffer,"Hi from the server!\n\n");
    send(newsockfd, buffer, strlen(buffer), 0);
    close(newsockfd);
    
    printf("\nServer : Process is going to terminate!!\n"); 
    exit(0);
}