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Id
4665828
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0
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0
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1
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CreationDate
2011-01-12T06:07:50.433
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2011-01-12T06:14:03.057
LastEditDate
2011-01-12T06:14:03.057
LastEditorUserId
9530
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9530
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4665618
PostTypeId
2
Score
5
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0
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text
Body
You need to call <a href="http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man2/aio_return.2.html#//apple_ref/doc/man/2/aio_return" rel="noreferrer"><code>aio_return(2)</code></a> exactly once for each asynchronous I/O operation. According to the note on that man page, failure to do so will leak resources, and it apparently also causes your problem. After you call <code>aio_suspend</code> to wait for the I/O to complete, make sure to call <code>aio_return</code> to get the number of bytes read, e.g.: <pre><code>const struct aiocb *aio_l[] = {&aio}; if (aio_suspend(aio_l, 1, 0) != 0) { printf("aio_suspend: %s\n", strerror(errno)); } else { printf("successfully read %d bytes\n", (int)aio_return(&aio)); printf("%d\n", *(int *)aio.aio_buf); } </code></pre> Also bear in mind these important notes from the <a href="http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man2/aio_read.2.html" rel="noreferrer"><code>aio_read(2)</code></a> man page (emphasis mine): <blockquote> The Asynchronous I/O Control Block structure pointed to by <code>aiocbp</code> and the buffer that the <code>aiocbp->aio_buf</code> member of that structure references must remain valid until the operation has completed. For this reason, use of auto (stack) variables for these objects is discouraged. The asynchronous I/O control buffer <code>aiocbp</code> should be zeroed before the <code>aio_read()</code> call to avoid passing bogus context information to the kernel. </blockquote>
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1. This table or related slice is empty.
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1. POaio_read from file error on OS X
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1. PTAnswer
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1. USAdam Rosenfield
UserOwnerUserId
1. USAdam Rosenfield
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1. POaio_read from file error on OS X
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1. COThanks, aio_return saves my day. I'm aware of stack shortcomings, but that wasn't an issue since I always waited for the read to finish right after it started (useless, I know, this for a dumb homework).
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