[LCP]Unbuffered getchar()

[McDonald, Joshua J (Josh)]

Hi All,

I'm new to this list and was wondering how active it is (I haven't seen any
mailings at all in a day and a half)?

Also, has anyone had much experience getting unbuffered keyboard input using
getchar()?
I've done a little looking, and found that if I use something similar to the
following,  that I can read each keystroke in as it is pressed, rather than
waiting for a return:

#include <stdio.h>
#include <termios.h>
#include <sys/ioctl.h>

main()
{
struct termios ts;
struct termios new_ts;
char c;
ioctl(0, TCGETS, &ts);
new_ts = ts;
new_ts.c_lflag &= !ICANON;
new_ts.c_lflag &= !ECHO;
ioctl(0, TCSETS, &new_ts);

c=getchar();
printf("%c\n",c);
}

I'm using "gcc -o test test.c" to compile, on a RH8.0 system.
Once the program exits, however, I need to use "stty sane" to get bash (Or
whatever) to echo characters (and linefeeds, etc) to the screen once again.

Does anyone know enough about termios to instruct me how to have the program
automatically return to a state where input is buffered/echo'd again?

Thanks in advance,
Josh.


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