How can I read keyboard without stopping

[John Silva]

Here's a little demo program which should work fine on System V or Xenix 
systems.  (doesn't work under BSD, due to the use of the termio structure).

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#include<stdio.h>
#include<termio.h>
#include<signal.h>


void Finish();

static struct termio term, saveterm;
static long chars = 0;
static long counter = 0;

main(argc, argv)
int argc;
char *argv[];
{
int old, i, timeout;
char ch;

timeout = 1;

ioctl(fileno(stdin), TCGETA, &saveterm);

for (i = 0; i < NSIG; i++)
	signal(i, Finish);

if (--argc) {
	if (i = (0xFF & atoi(*(++argv)))) timeout = i;
	}
printf("Using timeout of %.2fs\n", (float)timeout/10);
printf("You may begin typing....\n");

ioctl(fileno(stdin), TCGETA, &term);
term.c_lflag &= ~ICANON;
term.c_cc[VMIN]='\0';
term.c_cc[VTIME]=(char)timeout;
ioctl(fileno(stdin), TCSETA, &term);

while(1) {
	if((ch = getchar()) != (char)EOF) chars++;
	counter++;
	}

ioctl(fileno(stdin), TCSETA, &saveterm);
exit(0);
}

void
Finish(sig)
int sig;
{
ioctl(fileno(stdin), TCSETA, &saveterm);
printf("\nExiting, signal #%d\n", sig);
printf("chars: %ld\ncounter: %ld\n",chars,counter);
exit(0);
}

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John Silva
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