Path: utzoo!mnetor!tmsoft!torsqnt!hybrid!scifi!bywater!uunet!st-andy!larry
From: larry@st-andy.uucp (Larry Martell)
Newsgroups: comp.lang.c
Subject: Re: Making chars disappear
Message-ID: <1991Feb25.150849.859@st-andy.uucp>
Date: 25 Feb 91 15:08:49 GMT
References: <8531@castle.ed.ac.uk>
Reply-To: uunet!st-andy!larry (Larry Martell)
Distribution: comp
Organization: RMJ Securities Corp.
Lines: 44

In article <8531@castle.ed.ac.uk> james@castle.ed.ac.uk (J Gillespie) writes:
>
>Does anyone know of a way to prevent characters being echoed as they
>are typed in?  Like when you log in, your password doesn't get echoed.
>I have a nasty feeling this may involve sending control codes to the
>terminal.
>
>-- 

This is how I do it on a Sun running 4.1:

#include <fcntl.h>
#include <sys/termios.h>

main()

{

int fd;
struct termios  termios;

        if ((fd = open("/dev/tty",O_RDWR)) < 0) {
                perror("open failed\n");
                exit(1);
        }

        if (ioctl(fd,TCGETS,&termios) < 0) {
                perror("ioctl failed\n");
                exit(1);
        }

        termios.c_lflag &= ~ECHO;

        if (ioctl(fd,TCSETS,&termios) < 0) {
                perror("ioctl failed\n");
                exit(1);
        }
}

See termio(4) for more info.
-- 
Larry Martell
uunet!st-andy!larry
212-668-9478