Ncurses and reading from seriall port

[Philipp H. Mohr]

Hello,

I am trying to read from the serial port and to print out the string
I read. I know I could just print it out on the command line, but
I want to do other fancy thing with the string in the next stage.
My problem is that in:

    for (;;)
    {
                addch('b');
                refresh();

                res = read(fd,buf,255);
        buf[res]=0;
    }

b gets printed, but It dosn't read the seriall port - or doesn't print it.

Thank you very much.

Phil

code:

#include <curses.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <stdio.h>

#define BAUDRATE B38400
#define MODEMDEVICE "/dev/ttyS1"
#define _POSIX_SOURCE 1

#define FALSE 0
#define TRUE 1

static void finish(int sig);

int
main(int argc, char *argv[])
{
    int num = 0;
        int fd,c, res, result;
        struct termios oldtio,newtio;
        char buf[5];

    (void) signal(SIGINT, finish);      /* arrange interrupts to terminate
*/
    (void) initscr();      /* initialize the curses library */

        fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY );
        if (fd <0) {perror(MODEMDEVICE); exit(-1); }

        tcgetattr(fd,&oldtio);
        bzero(&newtio, sizeof(newtio));
        newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD;

        newtio.c_iflag = IGNPAR | ICRNL;
        newtio.c_oflag = 0;
        newtio.c_lflag = ICANON;

        tcflush(fd, TCIFLUSH);
        tcsetattr(fd,TCSANOW,&newtio);

        addch('a');
        refresh();

    for (;;)
    {
                addch('b');
                refresh();

                res = read(fd,buf,255);
        buf[res]=0;
    }
        tcsetattr(fd,TCSANOW,&oldtio);

    finish(0);               /* we're done */
}

static void finish(int sig)
{
    endwin();

    exit(0);
}