linux-kernel - libaio asynchronous syscall io

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Date:	Tue, 20 Oct 2009 14:58:17 -0700
From:	Zubin Dittia <zubin@...tri.com>
To:	linux-kernel@...r.kernel.org
Subject: libaio asynchronous syscall io_getevents blocks on error

I'm writing a program that uses the kernel's io_submit/io_getevents
system calls.  What I would like to be able to do is submit N
operations for i/o on different files, and then call io_getevents with
min_nr = nr = N and a timeout of NULL, so that I can block until all N
operations have completed.  This works great, except when one of the
operations has an error (eg., if one of the descriptors is invalid).
In this case, the call to io_getevents appears to block indefinitely.
Shouldn't an error on one of the submitted operations count as a
completion event for that operation, so I can check the error code
when the call returns?  Any help would be appreciated.
Thanks in advance,
-Zubin
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