Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!nthropy!andy
From: andy@nthropy.UUCP (Andy Lowe)
Newsgroups: comp.windows.x
Subject: Does time go backwards from 10/24/90?
Message-ID: <9012132128.AA12775@nth.com>
Date: 13 Dec 90 21:28:03 GMT
Lines: 34
Posted-Date: Thu, 13 Dec 90 15:28:03 CST
To: comp-windows-x@cs.utexas.edu



Fellow Server Hackers:

Please forgive me if I'm missing something obvious, but...


Consider the following fragment from os/4.2bsd/utils.c:
 
long
GetTimeInMillis()
{
    struct timeval  tp;

    gettimeofday(&tp, 0);
    return(tp.tv_sec * 1000) + (tp.tv_usec / 1000);
}

gettimeofday() returns seconds since 1/1/70 GMT 


By my calculations, this computation overflowed 32 bits about 7 weeks
ago, since tp.tv_sec is a long (at least in my copy of SunOS).

(Notably, tp.tv_sec is declared unsigned long in my copy of AIX 3.1,
but is signed in my copies of ISC and SCO unix.)

Please responsd via e-mail, if you can shed some light on this for me.


Thanks, and regards

Andy Lowe
andy@nth.com