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Date:	Tue, 20 Oct 2009 18:25:09 -0400
From:	Jeff Moyer <>
To:	Zubin Dittia <>
Subject: Re: libaio asynchronous syscall io_getevents blocks on error

Zubin Dittia <> writes:

> 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.

Did you check the return value of io_submit?

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