c - termios.h 如何使用位掩码来确定终端应该是什么模式？

Question

基本上，如果我写:

struct termios raw;
tcgetattr(STDIN_FILENO, &raw);
raw.c_lflag &= ~(ECHO);
tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);

为了不显示用户输入，c_lflag 中的一项更改如何允许 tcsetattr() 按预期工作？

Answer 1

您可以禁用 ECHO 以使输入不回显到输出，如下所示:

toptions.c_lflag &= ~(ECHO);

if (tcsetattr(fd, TCSANOW, &toptions) != 0)
{
    cout << "ERROR: " << errno << " from tcsetattr" <<endl;
    exit(1);
}

ECHO 定义为:

ECHO in c_lflag controls whether input is immediately re-echoed as output. It is independent of ICANON, although they are often turned on and off together. When passwd prompts for your password, your terminal is in canonical mode, but ECHO is disabled.