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Date: Sat, 26 Jul 1997 12:29:07 -0700 (PDT)
From: FreeBSD Technical Reader <kernel@acromail.ml.org>
To: denny1@home.com
cc: freebsd-gnats-submit@FreeBSD.ORG, GNATS Management <gnats@FreeBSD.ORG>,
        freebsd-bugs@hub.freebsd.org
Subject: Re: bin/4154: wish /bin/sleep handled fractions of a second.
In-Reply-To: <199707240518.WAA09252@hub.freebsd.org>
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Wouldn't you want to use usleep() for that only thing is that I think that
is good only about to 0.02 seconds generally unless you change HZ which
messes up some other things (I wonder if these would be fixed by a make
world)


On Wed, 23 Jul 1997 denny1@home.com wrote:

> 
> >Number:         4154
> >Category:       bin
> >Synopsis:       wish /bin/sleep handled fractions of a second.
> >Confidential:   no
> >Severity:       non-critical
> >Priority:       low
> >Responsible:    freebsd-bugs
> >State:          open
> >Class:          change-request
> >Submitter-Id:   current-users
> >Arrival-Date:   Wed Jul 23 22:20:01 PDT 1997
> >Last-Modified:
> >Originator:     Denny Gentry
> >Organization:
> >Release:        N/A
> >Environment:
> Fix was developed on OpenBSD.
> >Description:
>   I have often wished /bin/sleep could sleep for less than one second,
> in the inner loop of a script which I want to slow down slightly.
> Such a feature would be an extension to POSIX, which deals only
> with full seconds.
>   This has been implemented in OpenBSD. The crucial portion of the
> code I submitted there has been pasted below. It would be nice to
> get such an extension adopted more widely in *BSD, so portable scripts
> could use it.
> >How-To-Repeat:
>   /bin/sleep 0.5
>   wish it worked the way you want.
> >Fix:
> /*	$OpenBSD: sleep.c,v 1.6 1997/06/29 08:09:21 denny Exp $	*/
> 
> 	cp = *argv;
> 	while ((*cp != '\0') && (*cp != '.')) {
> 		if (!isdigit(*cp)) usage();
> 		secs = (secs * 10) + (*cp++ - '0');
> 	}
> 
> 	/* Handle fractions of a second */
> 	if (*cp == '.') {
> 		*cp++ = '\0';
> 		for (i = 100000000; i > 0; i /= 10) {
> 			if (*cp == '\0') break;
> 			if (!isdigit(*cp)) usage();
> 			nsecs += (*cp++ - '0') * i;
> 		}
> 	}
> 
> 	rqtp.tv_sec = (time_t) secs;
> 	rqtp.tv_nsec = nsecs;
> 
> 	if ((secs > 0) || (nsecs > 0))
> 		(void)nanosleep(&rqtp, NULL);
> >Audit-Trail:
> >Unformatted:
>