Reading and Writing on same serial port

Hai all
I have successfully communicated serial ports by running receive and
transmitting programs in different terminals.Now i need to read and
write data on same port.Here i am unable to do this.I am giving my
code.If it has any bugs,help me out.
waiting for your responses guys..
                         /*program:*/

#include <stdio.h>   /* Standard input/output definitions */
#include <string.h>  /* String function definitions */
#include <unistd.h>  /* UNIX standard function definitions */
#include <fcntl.h>   /* File control definitions */
#include <errno.h>   /* Error number definitions */
#include <termios.h> /* POSIX terminal control definitions */

int main()
{
 int fd,i=0;
 char c,buff[100];
 struct termios options;
 fd = open("/dev/ttyS1", O_RDWR | O_NOCTTY );
 if (fd == -1)
 perror("Unable to open /dev/ttyS1\n");
 else
{
 fcntl(fd, F_SETFL, 0);
 tcgetattr(fd, &options);
 cfsetispeed(&options,B9600);
 cfsetospeed(&options,B9600);
 options.c_cflag |= (CLOCAL | CREAD);
 options.c_cflag &= ~PARENB;
 options.c_cflag &= ~CSTOPB;
 options.c_cflag &= ~CSIZE;
 options.c_cflag |= CS8;
 options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
 options.c_oflag &= ~OPOST;
 options.c_cc[VMIN]=1;
 tcsetattr(fd,TCSANOW, &options);
 fprintf(stdout,"In server\n");
 while(1)
 {
 i=write(fd,"haranath",8);
  if(i<=0)
  fprintf(stderr,"Write() failed!\n");      */
  i=read(fd,buff,1);
  if(i<=0)
  fprintf(stderr,"Read() failed!\n");
  write(1,buff,i);
 }
 close (fd);
 }
 return (0);
 }

                                         Thanking you.

                With Regards,

                emb in linux