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SubjectRe: compat_sys_times() bogus until jiffies >= 0.
David Miller <> writes:

> I agree with this analysis.
> The Linux man page for times() explicitly lists (clock_t) -1 as a
> return value meaning error.
> So even if we did make some effort to return errors "properly" (via
> force_successful_syscall_return() et al.) userspace would still be
> screwed because (clock_t) -1 would be interpreted as an error.
> Actually I think this basically proves we cannot return (clock_t) -1
> ever because all existing userland (I'm not talking about inside
> glibc, I'm talking about inside of applications) will see this as an
> error.
> User applications have no other way to check for error.
> This API is definitely very poorly designed, no matter which way we
> "fix" this some case will remain broken.

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.


Andreas Schwab, SuSE Labs,
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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