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From: stuart@BMS-AT.UUCP (Stuart D. Gathman)
Newsgroups: net.unix,net.micro.att,net.unix-wizards
Subject: Re: Keyboard check under UNIX Sys V?
Message-ID: <224@BMS-AT.UUCP>
Date: Sun, 28-Sep-86 15:40:30 EDT
Article-I.D.: BMS-AT.224
Posted: Sun Sep 28 15:40:30 1986
Date-Received: Tue, 30-Sep-86 19:47:17 EDT
References: <30896@arizona.UUCP>
Distribution: net
Organization: Business Management Systems, Inc., Fairfax, VA
Lines: 34
Xref: watmath net.unix:9397 net.micro.att:1547 net.unix-wizards:19718
Summary: VMIN and VTIME in SysV

In article <30896@arizona.UUCP>, sbw@arizona.UUCP (stephen wampler) writes:
> What is the preferred way to determine if a key has been pressed
> on the keyboard when running UNIX Sys V?  I know that some UN*X

#include <sys/termio.h>

{
  struct termio tty, save;
  char c;

  ioctl(0,TCGETA,&tty);
  save = tty;				/* save current tty definitions */
  tty.c_lflag &= ~(ECHO|ICANON);	/* enter raw mode */
  tty.c_cc[VMIN]=0;		/* wait for at least VMIN chars on read */
  tty.c_cc[VTIME]=0;		/* wait at least VTIME seconds/10 on read */
  ioctl(0,TCSETA,&tty);

  saved = read(0,&c,1);
  if (saved)
    printf("You typed a '%c'.\n",c);
  else
    printf("You haven't typed anything yet.\n");

/*
  Note, you will have to save 'c' yourself if you need it!
  Perhaps stdio would work (using ungetc()).
*/

/* restore tty state */

  ioctl(0,TCSETA,&save);
}
-- 
Stuart D. Gathman	<..!seismo!{vrdxhq|dgis}!BMS-AT!stuart>