C Class SocketServer

#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

void error (char* msg)
{
  perror(msg);
  exit(0);
}

int main(int argc, char *argv[])
{
  int sockfd, portno, n;
  struct sockaddr_in serv_addr;
  struct hostent *server;
  char buffer[256];
  if (argc<3)
  {
    fprintf(stderr, "usage %s hostname port\n", argv[0]);
    exit(0);
  }
  portno = atoi(argv[2]);
  sockfd = socket(AF_INET, SOCK_STREAM,0);
  if(server == NULL)
  {
    fprintf(stderr,"ERROR, no such host\n");
    exit(0);
  }
  bzero((char*)&serv_addr, sizeof(serv_addr));
  serv_addr.sin_family = AF_INET;
  if(connect(sockfd,(struct sockaddr *) &serv_addr, sizeof(serv_addr))<0)
  {
    error("ERROR connecting");
  }
  printf("Please enter the mesage: ");
  bzero(buffer, 256);
  fgets(buffer, 255, stdin);
  n= write(sockfd,buffer,strlen(buffer));
  if(n<0)
  {
    error("ERROR writing to socket");
  }
bzero(buffer,256);
  n=read(sockfd,buffer,255);
  if (n<0)
  {
    error("Error reading from socket");
  }
  printf("%s\n", buffer);
return 0;

}