How to read from serial in c ? (under linux)

Projects Programming
14

I'm trying this way but still no success:

        struct termios options;
	int nBytesRead = 0;
	char buffer[20];

	int fd = open(SERIAL_PORT,O_RDONLY | O_NOCTTY);

	if(fd == -1){
		perror("unable to open serial port");
		return -1;	
	}

       //setting baud rate
	tcgetattr(fd, &options);
	cfsetispeed(&options,B9600);
	cfsetospeed(&options,B9600);	
	options.c_cflag |= (CLOCAL | CREAD);
	tcsetattr(fd,TCSANOW,&options);
	fcntl(fd,F_SETFL,0); //setting blocking read
	
	nBytesRead = read(fd,buffer,20);

now it just immediately returns from read with 0 bytes read...but read() should be blocking.