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C/C++ code:
/************************************
version:0.1
date :12/01/2010
author :yangchar
************************************/

#include <stdio.h> /* Standard input/output definitions */
#include <stdlib.h> /* Standard lib */
#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 */

#define DEBUG 1

int open_port(const char *dev_name)
{

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


fd = open(dev_name, O_RDWR | O_NOCTTY | O_NDELAY);
if (-1 == fd)
{
perror("open_port: Unable to open tty " );
}
else
{

if(DEBUG)
printf("The %s is opened \n",dev_name);
}


if( fcntl(fd, F_SETFL, 0)< 0)
perror("fcntl failed");
else
{
if(DEBUG)
printf("The fcntl is %d \n",fcntl(fd, F_SETFL, 0));
}


if ( isatty(fd) == 0 )
perror("This is not a


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