serial redirection

 int setOption(int fd,int nSpeed, int nBits, char mode,char nEvent, int nStop)
 {
     struct termios newtio;
     bzero( &newtio, sizeof( newtio ) );
     newtio.c_cflag  |=  CLOCAL | CREAD;
     newtio.c_cflag &= ~CSIZE;      switch( nBits )
     {
         case :
             newtio.c_cflag |= CS7;
             break;
         case :
             newtio.c_cflag |= CS8;
             break;
     }
     switch( mode )
     {
         case 'S':
             newtio.c_lflag |= ICANON;
             newtio.c_lflag |= ECHO;
             newtio.c_cc[VMIN] = ;
             newtio.c_cc[VTIME] = ;
             break;
         case 'N':
             newtio.c_lflag &= ~ICANON;
             newtio.c_lflag &= ~ECHO;
             newtio.c_lflag |= ECHOE;
             newtio.c_oflag |= ONLCR;
             newtio.c_oflag |= OPOST;
             newtio.c_cc[VMIN] = ;
             newtio.c_cc[VTIME] = ;
             break;
         case 'M':
             newtio.c_lflag &= ~ICANON;
             newtio.c_lflag &= ~ECHO;
             newtio.c_lflag |= ECHOE;
             newtio.c_oflag |= ONLCR;
             newtio.c_oflag |= OPOST;
             newtio.c_cc[VMIN] = ;
             newtio.c_cc[VTIME] = ;
             break;         default:
             break;
     }
     switch( nEvent )
     {
         case 'O':
             newtio.c_cflag |= PARENB;
             newtio.c_cflag |= PARODD;
             newtio.c_iflag |= (INPCK | ISTRIP);
             break;
         case 'E':
             newtio.c_iflag |= (INPCK | ISTRIP);
             newtio.c_cflag |= PARENB;
             newtio.c_cflag &= ~PARODD;
             break;
         case 'N':
             newtio.c_cflag &= ~PARENB;
             break;
     }     switch( nSpeed )
     {
         case :
             cfsetispeed(&newtio, B2400);
             cfsetospeed(&newtio, B2400);
             break;
         case :
             cfsetispeed(&newtio, B4800);
             cfsetospeed(&newtio, B4800);
             break;
         case :
             cfsetispeed(&newtio, B9600);
             cfsetospeed(&newtio, B9600);
             break;
         case :
             cfsetispeed(&newtio, B115200);
             cfsetospeed(&newtio, B115200);
             break;
         default:
             cfsetispeed(&newtio, B9600);
             cfsetospeed(&newtio, B9600);
             break;
     }
     if ( nStop ==  )
     {
         newtio.c_cflag &=  ~CSTOPB;
     }
     else if ( nStop ==  )
     {
         newtio.c_cflag |=  CSTOPB;
     }
     tcflush(fd,TCIFLUSH);
     if ((tcsetattr(fd,TCSANOW,&newtio))!=)
     {
         perror("com set error");
         return -;
     }
     return ;
 } void exitBmconsole(int signum)
 {
     char muxName[]={0x00};
     tcflush(console_fd,TCIFLUSH);
     tcflush(uart3_fd,TCIFLUSH);
     resetConsoleConfig();     dup2(oldstdin,);
     dup2(oldstdout,);
     close(uart3_fd);
     close(console_fd);
     muxClearAll(i2cfd_mux, MUX_SLAVE_ADDR);
     close(i2cfd_mux);     sprintf(muxName,"MUX%d",gMuxId);
     setInUseFlag(muxName,);
     exit();
 } void *MuxOutputToCom5(void)
 {
     int nread;
     char buff[MAX_BUFF_LEN+];
     if ((setOption(uart3_fd,,,'N','N',))<)
     {
         perror("setOption error");
         pthread_exit(NULL);
     }
     while()
     {
         memset(buff,,sizeof(char)*( MAX_BUFF_LEN +  ));
         nread = ;
         nread = read(uart3_fd,buff,MAX_BUFF_LEN);
         if (nread >)
         {
            if(buff[] ==  && buff[] == )
             {
               write(console_fd,&buff[],nread);
             }
             else
             {
               write(console_fd,buff,nread);
             }
         }
     }     pthread_exit(NULL);
 } void *Com5InputToMux(void)
 {
     int nread,result;
     char buff[MAX_BUFF_LEN+];
     char inputBuff[TEMP_ST_LEN+];
     int inputNumber = ;
     FILE *stream;
     int recievExitFlag = ;     if ((stream= freopen("/usr/std.in","w+",stdin)) == NULL)
     {
         printf("freopen stdin fail\n");
         kill(getpid(),SIGINT);
     }
     if ((stream = freopen("/usr/std.out","w+",stdout))== NULL)
     {
         printf("freopen stdout fail\n");
         kill(getpid(),SIGINT);
     }
     if ((result = setOption(console_fd,,,'M','N',))<)
     {
         perror("set console_fd opt error");
         kill(getpid(),SIGINT);
     }
     memset(inputBuff,,sizeof(char)*( TEMP_ST_LEN+ ));     while()
     {
         memset(buff,,sizeof(char)*( MAX_BUFF_LEN + ));         nread = read(console_fd,buff,MAX_BUFF_LEN);
         if (nread > )
         {
             if( recievExitFlag == )
             {
                 if( (nread != ) || (inputNumber ==  && nread ==  && buff[] != LOWER_Q_ASCII) || ( inputNumber ==  && nread ==  && buff[] != CR_ASCII) )
                 {
                     inputNumber = ;
                     recievExitFlag = ;
                     memset(inputBuff,,sizeof(char)*TEMP_ST_LEN);
                 }
             }
             if (nread == )
             {
                 if (buff[] == CR_ASCII)
                 {
                     if (inputNumber == 0x02 && inputBuff[] == QUIT_IDENTIFY_ASCII && inputBuff[] == LOWER_Q_ASCII)/*quit bmconsole*/
                     {
                         exitBmconsole();
                     }
                     memset(inputBuff,,sizeof(char)*TEMP_ST_LEN);
                     inputNumber = ;
                     recievExitFlag = ;
                 }
                 if (inputNumber > MAX_BUFF_LEN)
                 {
                     memset(inputBuff,,sizeof(char)*TEMP_ST_LEN);
                     inputNumber = ;
                 }
                 if ( buff[] == QUIT_IDENTIFY_ASCII )
                 {
                     recievExitFlag = ;
                 }
                 if ( recievExitFlag == )
                 {
                     inputBuff[inputNumber++] = buff[];
                 }
             }
             if (recievExitFlag != )
             {
                 write(uart3_fd,buff,nread);
             }
         }
     }
     pthread_exit(NULL);
 }