Enable Control+Q capture by setting input mode

Clear the IXON flag of c_iflag in the function raw_mode_enable. This
sets the input mode to disable the start/stop output control (,which
is Control+Q and Control+S), so that it can enable Control+Q capture
without acquiring user to use the extra command.

Co-authored-by: YU-WEI,HSU <blackfire106.1231@gmail.com>

Author: rota1001

README.md

@@ -36,11 +36,6 @@ This utility offers the following functionality:
   - `Ctrl + P`: Toggle pause/resume of the game board display
   - `Ctrl + Q`: Terminate all tic-tac-toe games running in kernel space
 
-In terminal environments that use flow control (particularly bash), you must enable the Ctrl+Q shortcut. Run the following command before starting xo-user:
-```
-$ stty start '^-' stop '^-'
-```
-
 Simply run the command below after the kernel module is loaded:
 ```
 $ sudo ./xo-user

xo-user.c

@@ -46,6 +46,7 @@ static void raw_mode_enable(void)
     tcgetattr(STDIN_FILENO, &orig_termios);
     atexit(raw_mode_disable);
     struct termios raw = orig_termios;
+    raw.c_iflag &= ~IXON;
     raw.c_lflag &= ~(ECHO | ICANON);
     tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);
 }