Reading os.Stdin, Unbuffered

[dc0d]

Is there a way to read from `os.Stdin` in an unbuffered way? (Not waiting for a `\n` or anything).

[Jan Mercl]

On Mon, Nov 27, 2017 at 4:00 PM dc0d <kaveh.sh...@gmail.com> wrote:

> Is there a way to read from `os.Stdin` in an unbuffered way? (Not waiting for a `\n` or anything).

        n, err := os.Stdin.Read(buf)

does not wait for `\n`. Or do you actually mean setting a terminal in raw mode? Because os.Stdin does not have to be a terminal.

--

-j

[dc0d]

For example I want the program to exit, if any key has been pressed on keyboard. I can not find any way to skip the wait for a necessary split character (like '\n').

[Axel Wagner]

That is not Go specific; the OS does the line-buffering. You could use e.g. termbox to disable that.

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[an...@aubble.com]

Use https://godoc.org/golang.org/x/crypto/ssh/terminal#MakeRaw to set raw mode on the stdin terminal.

Then you can just read from os.Stdin into a single byte buffer. If the read completes, then a key was pressed.

[Robert Solomon]

I trying to learn how to use pseudo-terminal-go.  It works fine under Ubuntu 16.04 amd64.  But not fine on win10 64 bit.

go get github.com/carmark/pseudo-terminal-go/terminal

#github.com/carmark/pseudo-terminal-go/terminal
github.com\carmark\pseudo-terminal-go\terminal\terminal.go:715:15: Undefined State
github.com\carmark\pseudo-terminal-go\terminal\terminal.go:719:2:: Undefined Restore
github.com\carmark\pseudo-terminal-go\terminal\terminal.go:724:18: Undefined MakeRaw

I tried it with the -u flag also and got the same result.  And it doesn't matter if I use \ or / on that command line.

I also use github's termbox-go on this win10 box, and that works fine.

What's up?

--rob solomon

[Marcus Franke]

Hi,

Looking at the repository I see there are termios_darwin_amd64, termios_freebsd_amd64, and termios_linux_amd64 files.

That package has code for these three operating systems, but no windows support.

A terminal on a different OS isn't as standardized as you seem to assume.

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[Robert Solomon]

Thanks 

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