getline() function behaves strangly

[venkata narendr]

I am trying to emulate telnet functionality by writing a socket listener program, and an application redirecting its console to the listener over sockets.

On the server side I opened a socket on my local ip, a defined port, and started listening on it like this

sockfd = socket(AF_INET,SOCK_STREAM,0);
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
bind(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr);
listen(sockfd,5);
neewsockfd = accept(sockfd,(struct sockaddr*)&cli_addr,&clien);
 

Then I started reading the incoming data in a seperate thread like this

 ...
while(1)
{
  bzero(buffer,256);
  n= read(newsockfd,buffer,255);
  if(n>0)
     printf("%s",buffer);
}  
 

And in the main routine after the listneing code I added the socket data sending part like this.

 ....
while(1)
{
   bzero(buffer,256);
   getline(&buffer,&t,stdin);
   n=send(newsockfd,buffer,strlen(buffer),MSG_EOR);
}
 

And for the client part I had connected to the server like this.

 ....
sockfd = socket(AF_INET,SOCK_STREAM,0);
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
inet_pton(AfF_INET,hostip,&serv_addr.sin_addr.s_addr)
serv_addr.sin_port = htons(portno);
connect(sockfd,serv_addr,sizeof(serv_addr));
 

And then I duped the stdin, stdout and stderr to sockfd descriptor for redirecting the console as follows.

 ....
 dup2(sockfd,STDIN_FILENO);
 dup2(sockfd,STDOUT_FILENO);
 dup2(sockfd,STDERR_FILENO);
 
 close(sockfd);
 
 

And finally I have something like this in client to test the console redirecting

 ...
while(1)
{
   bzero(mystring,256);
   i = getline(&string,&t,stdin);
   printf("Input:%s-%d\n",mystring,i);
}
 
 

In the above code I expect the getline to be blocked till I enter some characters on the server application console, but for my agony it comes out with i value 0 repeatedly.

Any idea why this behavior.