macOS 10.12.3, Xcode 8.2.1, ObjC

I'm finding the following line to be problematic:

    NSMutableData *myData = [NSMutableData dataWithLength:80];

I assume this ends up calling calloc(3) to allocate and zero out the data. But 
for some reason, it's always setting errno to a seemingly random nonzero value, 
generally either errno=2 (ENOENT) or errno=22 (EINVAL). 

Now that I know it does this, I can make accommodations for it, but is this 
expected behavior? 

-Carl

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