Recently, I am trying to write a simple version of Linux command more. In order to do that, I need to enter noncanonical mode and non-echo mode in the terminal so that I get the input immediately after keypressing and terminal does not show the character I type.
I did it by doing so:
// set the terminal mode
struct termios tm;
tcgetattr(STDIN_FILENO, &old);
tm = old;
tm.c_lflag &= ~(ICANON | ECHO);
tm.c_cc[VMIN] = 1;
tm.c_cc[VTIME] = 0;
tcsetattr(STDIN_FILENO, TCSADRAIN, &tm);
This works when I use arguments like
more test_file
But when I tried to pipe more with other command like
ls /bin | more
The terminal is back to canonical and echo mode. Why does this happen?
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