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pread and EACCES error?

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pread and EACCES error?

Subject: pread and EACCES error?
From: Brian Bergstrand <email@hidden>
Date: Wed, 20 May 2009 12:55:28 +0300

Hi all, I'm seeing a weird error from pread in the following setup:

Copying from a 300GB PATA drive connected via USB to another 300GB ATA drive connected via Firewire using the raw char devices for each. After copying about 37GB of data, pread fails on the source USB drive with EACCES (13). According to the man page, this is not a valid error return (although the man page may be out of date).

The copy is done in DKIOCGETMAXBLOCKCOUNTREAD chunks (128KB for ATA).

So where is the EACCES coming from? The IOKit block drivers? And what does it mean in this situation?

Mac OS X 10.5.7 (Darwin 9.7) on Intel.

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