Date: Tue, 1 Apr 2003 04:29:22 +0700 From: Alexey Dokuchaev <danfe@nsu.ru> To: Dan Nelson <dnelson@allantgroup.com> Cc: arch@freebsd.org Subject: Re: itimerfix() fix for time validity check Message-ID: <20030331212922.GA53585@regency.nsu.ru> In-Reply-To: <20030331201454.GA6000@dan.emsphone.com> References: <20030331174454.GA51622@regency.nsu.ru> <20030331201454.GA6000@dan.emsphone.com>
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On Mon, Mar 31, 2003 at 02:14:54PM -0600, Dan Nelson wrote:
> In the last episode (Apr 01), Alexey Dokuchaev said:
> > While porting some apps written for Linux to FreeBSD, I've
> > encountered the fact that, while under Linux it's quite appropriate
> > (and possible) to pass million and more milliseconds as tv_usec value
> > in
> >
> > struct timeval {
> > long tv_sec;
> > long tv_usec;
> > };
> >
> > used in functions like setitimer(), it's not like that in FreeBSD.
> >
> > Brief investigation showed that itimerfix() treats tv_usec >= 1000000
> > invalid. On contrary, Linux recalculates the values (and eventually,
> > tv_usec is indeed less than 1000000.
>
> Then it is violating the SUSV3/POSIX 1003.1-2001 standard:
>
> The setitimer() function shall fail if:
>
> [EINVAL]
> The value argument is not in canonical form. (In canonical form,
> the number of microseconds is a non-negative integer less than
> 1000000 and the number of seconds is a non-negative integer.)
>
> Free registration to access the standard is at
> http://www.unix.org/online.html
Thanks for clarification.
I think the issue can now be withdrawn.
>
> > Since I'm unaware of what does any particular standard say on this
> > issue, but since the dominant number of apps are being written (and
> > designed) for Linux, this seems to cause run-time compatibility problem;
> > quite a few apps in out ports collection might need special patching.
>
> Those programs will also fail on Solaris, which fails on invalid
> timeval values.
Yes, indeed, I've just checked it.
./danfe
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