[Haskell-cafe] Disable echo in POSIX terminal

[Thomas Schilling]

On Fri, 2007-11-09 at 10:59 -0500, Taylor Venable wrote:
> Hello all,
> 
> I've written a little Haskell program to get information from a MySQL
> database (great thanks to anybody reading this who works on HSQL, by
> the way) but I want to keep the user's password concealed, obviously.
> Currently I prompt for it from the terminal, but the problem is that
> it's echoed just like all other input.  I would like to disable input
> echo when asking for the password, but I'm not sure how.  I notice
> there's a System.POSIX.Terminal module, but I have no idea how to use
> it, or whether it will do what I want.  Any ideas would be greatly
> appreciated.
> 
> Best regards.
> 

In C you usually use:  getpasswd
  (http://docsrv.sco.com:507/en/man/html.S/getpasswd.S.html)

I cannot find it System.Posix, so you might have to write your own FFI
bindings.  Otherwise, you can play around with the terminal modes from:

http://haskell.org/ghc/docs/latest/html/libraries/unix-2.2.0.0/System-Posix-Terminal.html#t%3ATerminalMode

Good luck!