What have i missed when writing this serial test program - c++

Question

I am having serious trouble with rs232 communications in linux so i wrote this test program to make sure it was not other parts of my program interfering with the serial communications.
The program however does not work so as i feared it is the serial port code that is the problem.
I have a laptop with centos running the program and that is connected to a computer with windows xp running hyperterminal. the code executes ok according to the error checking but nothing is showing up in huperterminal.
The serial pore setup I am trying to achive is 115200 baud rate, 8 databits, 1 stopbit and mark parity.
This is the program:
#include <termios.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <ncurses.h>
#include <fcntl.h>
#include <unistd.h>
int main()
{
int port, serial, i;
unsigned long nobw;
char buf[10];
struct termios options;
port = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);
if (port == -1)
perror("open_port: Unable to open /dev/ttyS0 - ");
else
printf("port open \n");
tcgetattr(port, &options); // get current settings
cfsetispeed(&options, 115200); // set baud rate
cfsetospeed(&options, 115200); // set baud rate
options.c_cflag &= ~CSIZE; // Mask the character size bits
options.c_cflag |= CS8; // 8 bit data
options.c_cflag &= ~PARENB; // set parity to no
options.c_cflag &= ~PARODD; // set parity to no
options.c_cflag |= CSTOPB;//set mark parity by using 2 stop bits
options.c_cflag |= (CLOCAL | CREAD);
options.c_oflag &= ~OPOST;
options.c_lflag &= 0;
options.c_iflag &= 0; //disable software flow controll
options.c_oflag &= 0;
tcsetattr(port, TCSANOW, &options);// save the settings
ioctl(port, TIOCMGET, &serial);
serial |= TIOCM_DTR; // set DTR to high
ioctl(port, TIOCMSET, &serial);
for(i = 0; i < 10; i++)
{
buf[i] = i;
}
for(i = 0; i < 10; i++)
{
errno = 0;
nobw = write(port, buf, 1);
if(nobw == -1)
perror("WriteComm:");
else
printf("sent character %d \n", i);
}
return 0;
}
This is all done from tutorials on the interned i have little idea what im doing, can you see where i have gone wrong ?
also if anyone knows how to do space parity that would also be appreciated.

Answer 1

Maybe worth checking if the setup works without your code? :)
If you connect using minicom on the linux side and hyperterminal on the windows side, can you pass data back and forth?