taglinefilesource code
ICRNL1789drivers/char/tty_io.ctty_std_termios.c_iflag = ICRNL | IXON;
ICRNL253drivers/char/tty_ioctl.ctermios->c_iflag = ICRNL | IXON;
ICRNL136include/linux/tty.h#define I_ICRNL(tty)  _I_FLAG((tty),ICRNL)