stracing bash more reveals another thing; when executing command like stty then before forking bash calls TCSETSW ioctl to set tty settings, and after child exi

stracing bash more reveals another thing; when executing command like stty then before forking bash calls TCSETSW ioctl to set tty settings, and after child exists its calls TCSETSW again to set its own values, so stty does not actually show what mode the tty is in while bash is handling the input: ioctl(0, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost isig icanon echo ...}) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fe653abef10) = 5175 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WSTOPPED|WCONTINUED, NULL) = 5175 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5175, si_uid=1000, si_status=0, si_utime=0, si_stime=0} --- wait4(-1, 0x7fff156cbad0, WNOHANG|WSTOPPED|WCONTINUED, NULL) = -1 ECHILD (No child processes) ioctl(0, SNDCTL_TMR_STOP or TCSETSW, {B38400 opost isig -icanon -echo ...}) = 0 https://man7.org/linux/man-pages/man4/tty_ioctl.4.html https://man7.org/linux/man-pages/man4/tty_ioctl.4.html