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POPOSIX error 12 ("Cannot allocate memory") while uploading files from an iPhone
 

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  1. POPOSIX error 12 ("Cannot allocate memory") while uploading files from an iPhone
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    <p>I'm working on an iPhone application that involves uploading full photos from the camera (generally between 1.5 to 2.0 MB each) as well as their thumbnails (much smaller) to Amazon S3.</p> <p>The thumbnails always successfully upload, but <em>sometimes</em> the full images don't, and when they fail, they fail with POSIX error code 12, aka ENOMEM. However, I've added debug code to print the amount of free memory when the error happens, and there's always quite a bit free, usually more than 100 MB.</p> <p>Furthermore, the error crops up more often when the upload is happening over 3G and less when it's over wifi -- which seems strange, since the request isn't downloading much and the file being uploaded is already in memory (I've also tried streaming it from disk with no improvement).</p> <p>I've tried uploading the file using NSURLConnection, the Foundation CFHTTP* functions, and the ASIHTTPRequest library, but regardless, the error happens with the same frequency. Even stranger, all my Googling has revealed is that end users sometimes get error code 12 from Safari -- I haven't seen any iOS developers mentioning it. I'm working with an inherited code base, so it's possible there's something wrong with it, but I'm not even sure what to look for. Any insight would be greatly appreciated!</p>
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    1. USAlex Michaud
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    1. COwhat call is returning ENOMEM?
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    2. COWhen I was using NSURLConnection, I'd get the error as part of the didFailWithError delegate method -- an NSError with the POSIX error domain, error code 12, and the localized description "Cannot allocate memory". When I used a CFHTTPMessageRef, it would fail when calling CFReadStreamRead() (function returned -1), and afterward errno would be equal to 12.
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      1. USAlex Michaud
    3. COI see the same issue while trying to upload files with Google Docs API on 3G. A post on Dropbox API mentions similar issue: http://forums.dropbox.com/topic.php?id=25351. It seems to happen on slow connections (3G) with large files.
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      1. USKamchatka
 

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