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if((pid=fork())==0)
{
fd = open("/dev/tts/0", O_RDWR);
printf("fd %d\n",fd);
struct termios option;
tcgetattr( fd,&option);
//old_option = option ;
cfsetispeed(&option,B115200);
cfsetospeed(&option,B115200);
option.c_cflag |= (CS8 | CLOCAL | CREAD); //stopb
option.c_cflag &= ~PARENB; // None parity
option.c_cflag &= ~CSTOPB; // 1 stop bits
option.c_cflag &= ~CRTSCTS; // Disable hardware flow control
option.c_iflag &= ~(IXON | IXOFF | IXANY | ICRNL); // Disable software flow control
option.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // Set
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