basicserver.c

server.c

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/ip.h> /* superset of previous */


int main( int argc, char **argv){
  int tcp_socket;
  int newsocket;
  int port = atoi(argv[1]);
  struct sockaddr_in server, client; 

  
  if((tcp_socket = socket(AF_INET, SOCK_STREAM, 0)) < 0){
    printf("There was an error making the socket: %m\n");
    
    return 1;
  }

  
  server.sin_family = AF_INET;
  server.sin_addr.s_addr = INADDR_ANY;
  server.sin_port = htons(port);

  
  if(bind(tcp_socket, (struct sockaddr *) &server, sizeof(server)) < 0){
    printf("ERROR: %m\n");
    return 1;
  }
    
  if(listen(tcp_socket, 10) < 0){
    printf("Error:%m\n");
    return 1;
  }
  socklen_t clilen = sizeof(client);
  if((newsocket = accept(tcp_socket, (struct sockaddr *) &client, &clilen)) < 0){
    printf("Error:%m\n"); 
   return 1;
  }

  int length;
  char buffer[256];
  while(1){
    if((length = read(newsocket, buffer,255)) < 0) {
      printf("Error: %m \n");
      return 1;
    }
    
    if(write(newsocket,buffer, length) < 0){
      printf("Error: %m \n");
      return 1;
    }

    
  }


  /* close(newsocket); */
  /* close(socket);   */
  
  return 0;
  


}