RS232 return values

options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);

#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 */
#include <stdlib.h>  /* Some random library we found in a book */
#include <sys/ioctl.h>  /*would seem to have something to do with that ioctl function*/

int fd; /* File descriptor for the port */


int main()
{

    open_port();
    close(fd);

}








int open_port(void)
{
        fd = open("/dev/ttyS0", O_RDWR|O_NDELAY);

        if(fd != -1)
        {
                struct termios options;

                tcgetattr(fd, &options);

                /*set to 9600 7bit even parity, no flow control*/
                cfsetispeed(&options, B9600);
                cfsetospeed(&options, B9600);

                options.c_cflag |= (CLOCAL | CREAD);
                options.c_cflag |= PARENB;
                options.c_cflag &= ~PARODD;
                options.c_cflag &= ~CSTOPB;
                options.c_cflag &= ~CSIZE;
                options.c_cflag |= CS7;
                options.c_cflag &= ~CRTSCTS;

        options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);    /*non Canonical*/

                tcsetattr(fd, TCSANOW, &options);
                ioctl(fd, TCFLSH, 2);
        }
}