Linux内核tty驱动程序可以在代码中默认关闭echo吗？

Question

Related to this question: tty-flip-buffer-push-sends-data-back-to-itself

So I had the same issue, where I have written a driver and in my tty callback code that writes back out of the tty to the user (who is running cat /dev/mytty ).

When I write to the tty it loops back and cat should print it out. However since echo it on it goes around in a loop forever. Entering the command stty -F /dev/mytty -echo fixes that.

So my question is in my driver code is there a setting that I can change to not default to echo on? Maybe in the tty_probe(...) or tty_set_operations(...) functinos?

Answer 1

您可以在调用tty_set_operations()之前关闭echo，如下所示：

tty_driver->init_termios.c_lflag &= ~ECHO;