Implementing ‘noecho’. Programming details regarding the Linux implementation for ‘struct termios’ objects. Basic issues to consider. Normal tty operation is ‘canonical’ mode Input gets processed one line at a time Line-editing is allowed (e.g., backspace)
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Programming details regarding the Linux implementation for ‘struct termios’ objects
# we need storage for two ‘termios’ objects
origtty:.space60# original settings
worktty:.space60# a ‘working copy’
# Insufficient space would cause big trouble!
tcgetattr() does not
know the size that
we have allocated
system would overwite part of the next data-area
i.e., worktty.c_lflag &= ~ICANON;
worktty.c_cc[ VMIN ] = 1;worktty.c_cc[ VTIME ] = 0;