serial communication through rs232 in linux c - c

Question

I am new in Linux. I am facing problem in serial communications.
I have two computers, one is running a hyper terminal and on another I am writing a C program to communicate with hyper terminal. Both PC are connected through RS232.
I have written some code and I am able to send data to hyper terminal, but I am not sure how I can read data from hyper terminal with a program written in C on a Linux PC.
Any suggestions?
Thanks in advance.
Below is my code:
int main(int argc, char **argv)
{
struct termios options;
int fd;
fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);
if(fd == -1)
{
printf("Could not open port /dev/ttyS0\n");
return 1;
}
tcgetattr(fd, &options); //get port options
cfsetispeed(&options, B9600); //set input baud rate
cfsetospeed(&options, B9600); //set output baud rate
options.c_cflag |= (CLOCAL | CREAD); //enable receiver and set local mode
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS8;
options.c_cflag &= ~CRTSCTS; //disable hardware flow control
options.c_cflag &= ~(ICANON | ECHO | ISIG); //set raw input
options.c_cflag |= IXOFF; //disable software flow control
tcsetattr(fd, TCSANOW, &options); //set new port options
sleep(1);
int rc,count;
int size = 8;
unsigned char buf[10];
FILE *fp = NULL;
char ch;
int i=0;
printf("enter the data you want to send");
while((ch=getchar())!='\n')
{
write(fd,&ch,1);
}
close(fd);
printf("Finished.\n");
return 0;
}