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From: janne@enea.se (Jan Carlsson)
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Re: Timed-out Input
Keywords: System V - Yes,  BSD- ???
Message-ID: <834@enea.se>
Date: 3 Mar 90 17:30:14 GMT
References: <25DCE6F4.2232@paris.ics.uci.edu>
Reply-To: janne@enea.se (Jan Carlsson)
Organization: Enea Data AB, Sweden
Lines: 37
UUCP-Path: mcvax!kth!sunic!helios!janne

In article <25DCE6F4.2232@paris.ics.uci.edu> bvickers@paris.ics.uci.edu (Brett Joseph Vickers) writes:
>As you can see, I know of no way to time out raw or cbreaked input.
>Is there a way to do this with BSD?

You can use select(2):

#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/time.h>

main()
{
	struct sgttyb temp;
	fd_set rset;
	struct timeval timeout;
	char c;

	ioctl(0,TIOCGETP,&temp);
	temp.sg_flags |= CBREAK;
	ioctl(0,TIOCSETP,&temp);

	FD_ZERO(&rset);
	FD_SET(0,&rset);
	timeout.tv_sec = 3L;
	timeout.tv_usec = 0L;

	if (select(1,&rset,NULL,NULL,&timeout) == 1 &&
	    FD_ISSET(0,&rset))
		read(0,&c,1);
	else
		printf("Timed out\n");
}
-- 
Jan Carlsson, Enea Data AB, Box 232, Nytorpsvaegen 5, S-183 23 Taeby, Sweden
Phone: +46 8 792 25 00  !  e-mail: janne@enea.se
Fax:   +46 8 768 43 88  !