问如何让getc(stdin)返回ctrl字符？

EN

int ttyGetChar() {
  struct termios newTerminalSettings;
  struct termios oldTerminalSettings;
  int result;

  tcgetattr(STDIN_FILENO, &oldTerminalSettings); // get old settings
  newTerminalSettings = oldTerminalSettings; // Copy to set up new settings

  newTerminalSettings.c_lflag &= ~(ICANON | ECHO);
  tcsetattr(STDIN_FILENO, TCSANOW, &newTerminalSettings); // Apply the new settings

  result = getc(stdin); // read one character under new settings
  tcsetattr(STDIN_FILENO, TCSANOW, &oldTerminalSettings); // Restore the old settings
  return result;
}