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Re: Whacky ia64: linux_proc_xfer_partial and lseek vs pread64
Daniel Jacobowitz <drow@false.org> writes:
> On Fri, Feb 10, 2006 at 07:04:51PM +0100, Andreas Schwab wrote:
>> pread and lseek with SEEK_SET do not allow negative offsets. lseek on
>> /proc/$$/mem is a special exception.
>
> Uh-oh. Should pread have the same exception, or must we fall back to
> lseek?
pread fails upfront with offset < 0, whereas lseek lets the filesystem
llseek function decide. But a fallback wouldn't help here anyway, because
you can't read the vdso memory with read, only with ptrace.
Andreas.
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Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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