2010/8/15 Richard Mittel <[email protected]>: > I'm trying to get read-char to read a character as soon as it is typed, but > read-char insists on buffering the input until a carriage return is > entered. The Racket reference says that the buffer mode is controlled by > file-stream-buffer-mode, but it seems to have no effect. (More confusingly, > the doc says that line buffering, which I think is the behavior I'm seeing, > is not allowed on input ports.) > [...]
Hello Richard, at least in Unix environments, line buffering of direct user input is usually done by the terminal device, ie. at a stage in the pipeline before the Racket interpreter ever gets to see the input. To change this behaviour, your program would have to call tcsetattr(3) from the POSIX C library or invoke the external utility program stty(1) on the terminal file descriptor before reading input from it. Some time ago I wrote a small module that can do the latter, which I attach to this message for your reference. Ciao, Thomas -- When C++ is your hammer, every problem looks like your thumb.
terminal.ss
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