linux-kernel - Re: compat_sys_times() bogus until jiffies >= 0.

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Message-ID: <4734A4D9.3090907@redhat.com>
Date:	Fri, 09 Nov 2007 10:20:09 -0800
From:	Ulrich Drepper <drepper@...hat.com>
To:	Chris Friesen <cfriesen@...tel.com>
CC:	Andreas Schwab <schwab@...e.de>,
	David Miller <davem@...emloft.net>, paulus@...ba.org,
	akpm@...ux-foundation.org, lkml@...idb.org,
	linux-kernel@...r.kernel.org, mtk-manpages@....net
Subject: Re: compat_sys_times() bogus until jiffies >= 0.

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Chris Friesen wrote:
>> A possible remedy is to return the ticks since process start time, which
>> delays the wrap around much further.  POSIX only demands consistency
>> within the same process.
> 
> This would be an interesting solution.
> 
> The man page for linux states that the return code is time since system
> boot, so that could realistically be expected to correlate between
> different processes.

The Linux man page is documenting existing functionality on top of what
the standard requires.  Programmers should ever only require what the
standard guarantees.

I am perfectly willing to support a solution where the time is measured
from process startup time.  The only code using times() I found is
cross-platform and most likely does not depend on the value returned is
usable in isolation (only in a difference).

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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