Date: Wed, 23 Jul 1997 22:18:35 -0700 (PDT) From: denny1@home.com To: freebsd-gnats-submit@FreeBSD.ORG Subject: bin/4154: wish /bin/sleep handled fractions of a second. Message-ID: <199707240518.WAA09252@hub.freebsd.org> Resent-Message-ID: <199707240520.WAA09344@hub.freebsd.org>
next in thread | raw e-mail | index | archive | help
>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:
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199707240518.WAA09252>